diff options
Diffstat (limited to 'sys/netinet')
| -rw-r--r-- | sys/netinet/ip_output.c | 9 | ||||
| -rw-r--r-- | sys/netinet/ip_var.h | 1 | ||||
| -rw-r--r-- | sys/netinet/tcp.h | 1 | ||||
| -rw-r--r-- | sys/netinet/tcp_stacks/bbr.c | 15189 | ||||
| -rw-r--r-- | sys/netinet/tcp_stacks/rack.c | 4154 | ||||
| -rw-r--r-- | sys/netinet/tcp_stacks/rack_bbr_common.c | 48 | ||||
| -rw-r--r-- | sys/netinet/tcp_stacks/rack_bbr_common.h | 2 | ||||
| -rw-r--r-- | sys/netinet/tcp_stacks/sack_filter.c | 166 | ||||
| -rw-r--r-- | sys/netinet/tcp_stacks/sack_filter.h | 7 | ||||
| -rw-r--r-- | sys/netinet/tcp_stacks/tcp_bbr.h | 845 | ||||
| -rw-r--r-- | sys/netinet/tcp_stacks/tcp_rack.h | 80 |
11 files changed, 18994 insertions, 1508 deletions
diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c index 085040f25e64..cbd2d72188fa 100644 --- a/sys/netinet/ip_output.c +++ b/sys/netinet/ip_output.c @@ -212,7 +212,7 @@ ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags, static int ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m, - const struct sockaddr_in *gw, struct route *ro) + const struct sockaddr_in *gw, struct route *ro, bool stamp_tag) { #ifdef KERN_TLS struct ktls_session *tls = NULL; @@ -256,7 +256,7 @@ ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m, mst = inp->inp_snd_tag; } #endif - if (mst != NULL) { + if (stamp_tag && mst != NULL) { KASSERT(m->m_pkthdr.rcvif == NULL, ("trying to add a send tag to a forwarded packet")); if (mst->ifp != ifp) { @@ -791,7 +791,8 @@ sendit: */ m_clrprotoflags(m); IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); - error = ip_output_send(inp, ifp, m, gw, ro); + error = ip_output_send(inp, ifp, m, gw, ro, + (flags & IP_NO_SND_TAG_RL) ? false : true); goto done; } @@ -827,7 +828,7 @@ sendit: IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp, mtod(m, struct ip *), NULL); - error = ip_output_send(inp, ifp, m, gw, ro); + error = ip_output_send(inp, ifp, m, gw, ro, true); } else m_freem(m); } diff --git a/sys/netinet/ip_var.h b/sys/netinet/ip_var.h index 7580a7b45212..b6693eb58200 100644 --- a/sys/netinet/ip_var.h +++ b/sys/netinet/ip_var.h @@ -166,6 +166,7 @@ void kmod_ipstat_dec(int statnum); #define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */ #define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */ #define IP_NODEFAULTFLOWID 0x40 /* Don't set the flowid from inp */ +#define IP_NO_SND_TAG_RL 0x80 /* Don't send down the ratelimit tag */ #ifdef __NO_STRICT_ALIGNMENT #define IP_HDR_ALIGNED_P(ip) 1 diff --git a/sys/netinet/tcp.h b/sys/netinet/tcp.h index 508d4b5fbc17..37ba3bb55741 100644 --- a/sys/netinet/tcp.h +++ b/sys/netinet/tcp.h @@ -239,6 +239,7 @@ struct tcphdr { #define TCP_BBR_ACK_COMP_ALG 1096 /* Not used */ #define TCP_BBR_TMR_PACE_OH 1096 /* Recycled in 4.2 */ #define TCP_BBR_EXTRA_GAIN 1097 +#define TCP_RACK_DO_DETECTION 1097 /* Recycle of extra gain for rack, attack detection */ #define TCP_BBR_RACK_RTT_USE 1098 /* what RTT should we use 0, 1, or 2? */ #define TCP_BBR_RETRAN_WTSO 1099 #define TCP_DATA_AFTER_CLOSE 1100 diff --git a/sys/netinet/tcp_stacks/bbr.c b/sys/netinet/tcp_stacks/bbr.c new file mode 100644 index 000000000000..dccb2894ea68 --- /dev/null +++ b/sys/netinet/tcp_stacks/bbr.c @@ -0,0 +1,15189 @@ +/*- + * Copyright (c) 2016-2019 + * Netflix Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ +/** + * Author: Randall Stewart <rrs@netflix.com> + * This work is based on the ACM Queue paper + * BBR - Congestion Based Congestion Control + * and also numerous discussions with Neal, Yuchung and Van. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_inet.h" +#include "opt_inet6.h" +#include "opt_ipsec.h" +#include "opt_tcpdebug.h" +#include "opt_ratelimit.h" +#include "opt_kern_tls.h" +#include <sys/param.h> +#include <sys/module.h> +#include <sys/kernel.h> +#ifdef TCP_HHOOK +#include <sys/hhook.h> +#endif +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/proc.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#ifdef KERN_TLS +#include <sys/ktls.h> +#endif +#include <sys/sysctl.h> +#include <sys/systm.h> +#include <sys/qmath.h> +#include <sys/tree.h> +#ifdef NETFLIX_STATS +#include <sys/stats.h> /* Must come after qmath.h and tree.h */ +#endif +#include <sys/refcount.h> +#include <sys/queue.h> +#include <sys/eventhandler.h> +#include <sys/smp.h> +#include <sys/kthread.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/tim_filter.h> +#include <sys/time.h> +#include <vm/uma.h> +#include <sys/kern_prefetch.h> + +#include <net/route.h> +#include <net/vnet.h> + +#define TCPSTATES /* for logging */ + +#include <netinet/in.h> +#include <netinet/in_kdtrace.h> +#include <netinet/in_pcb.h> +#include <netinet/ip.h> +#include <netinet/ip_icmp.h> /* required for icmp_var.h */ +#include <netinet/icmp_var.h> /* for ICMP_BANDLIM */ +#include <netinet/ip_var.h> +#include <netinet/ip6.h> +#include <netinet6/in6_pcb.h> +#include <netinet6/ip6_var.h> +#define TCPOUTFLAGS +#include <netinet/tcp.h> +#include <netinet/tcp_fsm.h> +#include <netinet/tcp_seq.h> +#include <netinet/tcp_timer.h> +#include <netinet/tcp_var.h> +#include <netinet/tcpip.h> +#include <netinet/tcp_hpts.h> +#include <netinet/cc/cc.h> +#include <netinet/tcp_log_buf.h> +#include <netinet/tcp_ratelimit.h> +#include <netinet/tcp_lro.h> +#ifdef TCPDEBUG +#include <netinet/tcp_debug.h> +#endif /* TCPDEBUG */ +#ifdef TCP_OFFLOAD +#include <netinet/tcp_offload.h> +#endif +#ifdef INET6 +#include <netinet6/tcp6_var.h> +#endif +#include <netinet/tcp_fastopen.h> + +#include <netipsec/ipsec_support.h> +#include <net/if.h> +#include <net/if_var.h> +#include <net/ethernet.h> + +#if defined(IPSEC) || defined(IPSEC_SUPPORT) +#include <netipsec/ipsec.h> +#include <netipsec/ipsec6.h> +#endif /* IPSEC */ + +#include <netinet/udp.h> +#include <netinet/udp_var.h> +#include <machine/in_cksum.h> + +#ifdef MAC +#include <security/mac/mac_framework.h> +#endif + +#include "sack_filter.h" +#include "tcp_bbr.h" +#include "rack_bbr_common.h" +uma_zone_t bbr_zone; +uma_zone_t bbr_pcb_zone; + +struct sysctl_ctx_list bbr_sysctl_ctx; +struct sysctl_oid *bbr_sysctl_root; + +#define TCPT_RANGESET_NOSLOP(tv, value, tvmin, tvmax) do { \ + (tv) = (value); \ + if ((u_long)(tv) < (u_long)(tvmin)) \ + (tv) = (tvmin); \ + if ((u_long)(tv) > (u_long)(tvmax)) \ + (tv) = (tvmax); \ +} while(0) + +/*#define BBR_INVARIANT 1*/ + +/* + * initial window + */ +static uint32_t bbr_def_init_win = 10; +static int32_t bbr_persist_min = 250000; /* 250ms */ +static int32_t bbr_persist_max = 1000000; /* 1 Second */ +static int32_t bbr_cwnd_may_shrink = 0; +static int32_t bbr_cwndtarget_rtt_touse = BBR_RTT_PROP; +static int32_t bbr_num_pktepo_for_del_limit = BBR_NUM_RTTS_FOR_DEL_LIMIT; +static int32_t bbr_hardware_pacing_limit = 8000; +static int32_t bbr_quanta = 3; /* How much extra quanta do we get? */ +static int32_t bbr_no_retran = 0; +static int32_t bbr_tcp_map_entries_limit = 1500; +static int32_t bbr_tcp_map_split_limit = 256; + +static int32_t bbr_error_base_paceout = 10000; /* usec to pace */ +static int32_t bbr_max_net_error_cnt = 10; +/* Should the following be dynamic too -- loss wise */ +static int32_t bbr_rtt_gain_thresh = 0; +/* Measurement controls */ +static int32_t bbr_use_google_algo = 1; +static int32_t bbr_ts_limiting = 1; +static int32_t bbr_ts_can_raise = 0; +static int32_t bbr_do_red = 600; +static int32_t bbr_red_scale = 20000; +static int32_t bbr_red_mul = 1; +static int32_t bbr_red_div = 2; +static int32_t bbr_red_growth_restrict = 1; +static int32_t bbr_target_is_bbunit = 0; +static int32_t bbr_drop_limit = 0; +/* + * How much gain do we need to see to + * stay in startup? + */ +static int32_t bbr_marks_rxt_sack_passed = 0; +static int32_t bbr_start_exit = 25; +static int32_t bbr_low_start_exit = 25; /* When we are in reduced gain */ +static int32_t bbr_startup_loss_thresh = 2000; /* 20.00% loss */ +static int32_t bbr_hptsi_max_mul = 1; /* These two mul/div assure a min pacing */ +static int32_t bbr_hptsi_max_div = 2; /* time, 0 means turned off. We need this + * if we go back ever to where the pacer + * has priority over timers. + */ +static int32_t bbr_policer_call_from_rack_to = 0; +static int32_t bbr_policer_detection_enabled = 1; +static int32_t bbr_min_measurements_req = 1; /* We need at least 2 + * measurments before we are + * "good" note that 2 == 1. + * This is because we use a > + * comparison. This means if + * min_measure was 0, it takes + * num-measures > min(0) and + * you get 1 measurement and + * you are good. Set to 1, you + * have to have two + * measurements (this is done + * to prevent it from being ok + * to have no measurements). */ +static int32_t bbr_no_pacing_until = 4; + +static int32_t bbr_min_usec_delta = 20000; /* 20,000 usecs */ +static int32_t bbr_min_peer_delta = 20; /* 20 units */ +static int32_t bbr_delta_percent = 150; /* 15.0 % */ + +static int32_t bbr_target_cwnd_mult_limit = 8; +/* + * bbr_cwnd_min_val is the number of + * segments we hold to in the RTT probe + * state typically 4. + */ +static int32_t bbr_cwnd_min_val = BBR_PROBERTT_NUM_MSS; + + +static int32_t bbr_cwnd_min_val_hs = BBR_HIGHSPEED_NUM_MSS; + +static int32_t bbr_gain_to_target = 1; +static int32_t bbr_gain_gets_extra_too = 1; +/* + * bbr_high_gain is the 2/ln(2) value we need + * to double the sending rate in startup. This + * is used for both cwnd and hptsi gain's. + */ +static int32_t bbr_high_gain = BBR_UNIT * 2885 / 1000 + 1; +static int32_t bbr_startup_lower = BBR_UNIT * 1500 / 1000 + 1; +static int32_t bbr_use_lower_gain_in_startup = 1; + +/* thresholds for reduction on drain in sub-states/drain */ +static int32_t bbr_drain_rtt = BBR_SRTT; +static int32_t bbr_drain_floor = 88; +static int32_t google_allow_early_out = 1; +static int32_t google_consider_lost = 1; +static int32_t bbr_drain_drop_mul = 4; +static int32_t bbr_drain_drop_div = 5; +static int32_t bbr_rand_ot = 50; +static int32_t bbr_can_force_probertt = 0; +static int32_t bbr_can_adjust_probertt = 1; +static int32_t bbr_probertt_sets_rtt = 0; +static int32_t bbr_can_use_ts_for_rtt = 1; +static int32_t bbr_is_ratio = 0; +static int32_t bbr_sub_drain_app_limit = 1; +static int32_t bbr_prtt_slam_cwnd = 1; +static int32_t bbr_sub_drain_slam_cwnd = 1; +static int32_t bbr_slam_cwnd_in_main_drain = 1; +static int32_t bbr_filter_len_sec = 6; /* How long does the rttProp filter + * hold */ +static uint32_t bbr_rtt_probe_limit = (USECS_IN_SECOND * 4); +/* + * bbr_drain_gain is the reverse of the high_gain + * designed to drain back out the standing queue + * that is formed in startup by causing a larger + * hptsi gain and thus drainging the packets + * in flight. + */ +static int32_t bbr_drain_gain = BBR_UNIT * 1000 / 2885; +static int32_t bbr_rttprobe_gain = 192; + +/* + * The cwnd_gain is the default cwnd gain applied when + * calculating a target cwnd. Note that the cwnd is + * a secondary factor in the way BBR works (see the + * paper and think about it, it will take some time). + * Basically the hptsi_gain spreads the packets out + * so you never get more than BDP to the peer even + * if the cwnd is high. In our implemenation that + * means in non-recovery/retransmission scenarios + * cwnd will never be reached by the flight-size. + */ +static int32_t bbr_cwnd_gain = BBR_UNIT * 2; +static int32_t bbr_tlp_type_to_use = BBR_SRTT; +static int32_t bbr_delack_time = 100000; /* 100ms in useconds */ +static int32_t bbr_sack_not_required = 0; /* set to one to allow non-sack to use bbr */ +static int32_t bbr_initial_bw_bps = 62500; /* 500kbps in bytes ps */ +static int32_t bbr_ignore_data_after_close = 1; +static int16_t bbr_hptsi_gain[] = { + (BBR_UNIT *5 / 4), + (BBR_UNIT * 3 / 4), + BBR_UNIT, + BBR_UNIT, + BBR_UNIT, + BBR_UNIT, + BBR_UNIT, + BBR_UNIT +}; +int32_t bbr_use_rack_resend_cheat = 1; +int32_t bbr_sends_full_iwnd = 1; + +#define BBR_HPTSI_GAIN_MAX 8 +/* + * The BBR module incorporates a number of + * TCP ideas that have been put out into the IETF + * over the last few years: + * - Yuchung Cheng's RACK TCP (for which its named) that + * will stop us using the number of dup acks and instead + * use time as the gage of when we retransmit. + * - Reorder Detection of RFC4737 and the Tail-Loss probe draft + * of Dukkipati et.al. + * - Van Jacobson's et.al BBR. + * + * RACK depends on SACK, so if an endpoint arrives that + * cannot do SACK the state machine below will shuttle the + * connection back to using the "default" TCP stack that is + * in FreeBSD. + * + * To implement BBR and RACK the original TCP stack was first decomposed + * into a functional state machine with individual states + * for each of the possible TCP connection states. The do_segement + * functions role in life is to mandate the connection supports SACK + * initially and then assure that the RACK state matches the conenction + * state before calling the states do_segment function. Data processing + * of inbound segments also now happens in the hpts_do_segment in general + * with only one exception. This is so we can keep the connection on + * a single CPU. + * + * Each state is simplified due to the fact that the original do_segment + * has been decomposed and we *know* what state we are in (no + * switches on the state) and all tests for SACK are gone. This + * greatly simplifies what each state does. + * + * TCP output is also over-written with a new version since it + * must maintain the new rack scoreboard and has had hptsi + * integrated as a requirment. Still todo is to eliminate the + * use of the callout_() system and use the hpts for all + * timers as well. + */ +static uint32_t bbr_rtt_probe_time = 200000; /* 200ms in micro seconds */ +static uint32_t bbr_rtt_probe_cwndtarg = 4; /* How many mss's outstanding */ +static const int32_t bbr_min_req_free = 2; /* The min we must have on the + * free list */ +static int32_t bbr_tlp_thresh = 1; +static int32_t bbr_reorder_thresh = 2; +static int32_t bbr_reorder_fade = 60000000; /* 0 - never fade, def + * 60,000,000 - 60 seconds */ +static int32_t bbr_pkt_delay = 1000; +static int32_t bbr_min_to = 1000; /* Number of usec's minimum timeout */ +static int32_t bbr_incr_timers = 1; + +static int32_t bbr_tlp_min = 10000; /* 10ms in usecs */ +static int32_t bbr_delayed_ack_time = 200000; /* 200ms in usecs */ +static int32_t bbr_exit_startup_at_loss = 1; + +/* + * bbr_lt_bw_ratio is 1/8th + * bbr_lt_bw_diff is < 4 Kbit/sec + */ +static uint64_t bbr_lt_bw_diff = 4000 / 8; /* In bytes per second */ +static uint64_t bbr_lt_bw_ratio = 8; /* For 1/8th */ +static uint32_t bbr_lt_bw_max_rtts = 48; /* How many rtt's do we use + * the lt_bw for */ +static uint32_t bbr_lt_intvl_min_rtts = 4; /* Min num of RTT's to measure + * lt_bw */ +static int32_t bbr_lt_intvl_fp = 0; /* False positive epoch diff */ +static int32_t bbr_lt_loss_thresh = 196; /* Lost vs delivered % */ +static int32_t bbr_lt_fd_thresh = 100; /* false detection % */ + +static int32_t bbr_verbose_logging = 0; +/* + * Currently regular tcp has a rto_min of 30ms + * the backoff goes 12 times so that ends up + * being a total of 122.850 seconds before a + * connection is killed. + */ +static int32_t bbr_rto_min_ms = 30; /* 30ms same as main freebsd */ +static int32_t bbr_rto_max_sec = 4; /* 4 seconds */ + +/****************************************************/ +/* DEFAULT TSO SIZING (cpu performance impacting) */ +/****************************************************/ +/* What amount is our formula using to get TSO size */ +static int32_t bbr_hptsi_per_second = 1000; + +/* + * For hptsi under bbr_cross_over connections what is delay + * target 7ms (in usec) combined with a seg_max of 2 + * gets us close to identical google behavior in + * TSO size selection (possibly more 1MSS sends). + */ +static int32_t bbr_hptsi_segments_delay_tar = 7000; + +/* Does pacing delay include overhead's in its time calculations? */ +static int32_t bbr_include_enet_oh = 0; +static int32_t bbr_include_ip_oh = 1; +static int32_t bbr_include_tcp_oh = 1; +static int32_t bbr_google_discount = 10; + +/* Do we use (nf mode) pkt-epoch to drive us or rttProp? */ +static int32_t bbr_state_is_pkt_epoch = 0; +static int32_t bbr_state_drain_2_tar = 1; +/* What is the max the 0 - bbr_cross_over MBPS TSO target + * can reach using our delay target. Note that this + * value becomes the floor for the cross over + * algorithm. + */ +static int32_t bbr_hptsi_segments_max = 2; +static int32_t bbr_hptsi_segments_floor = 1; +static int32_t bbr_hptsi_utter_max = 0; + +/* What is the min the 0 - bbr_cross-over MBPS TSO target can be */ +static int32_t bbr_hptsi_bytes_min = 1460; +static int32_t bbr_all_get_min = 0; + +/* Cross over point from algo-a to algo-b */ +static uint32_t bbr_cross_over = TWENTY_THREE_MBPS; + +/* Do we deal with our restart state? */ +static int32_t bbr_uses_idle_restart = 0; +static int32_t bbr_idle_restart_threshold = 100000; /* 100ms in useconds */ + +/* Do we allow hardware pacing? */ +static int32_t bbr_allow_hdwr_pacing = 0; +static int32_t bbr_hdwr_pace_adjust = 2; /* multipler when we calc the tso size */ +static int32_t bbr_hdwr_pace_floor = 1; +static int32_t bbr_hdwr_pacing_delay_cnt = 10; + +/****************************************************/ +static int32_t bbr_resends_use_tso = 0; +static int32_t bbr_tlp_max_resend = 2; +static int32_t bbr_sack_block_limit = 128; + +#define BBR_MAX_STAT 19 +counter_u64_t bbr_state_time[BBR_MAX_STAT]; +counter_u64_t bbr_state_lost[BBR_MAX_STAT]; +counter_u64_t bbr_state_resend[BBR_MAX_STAT]; +counter_u64_t bbr_stat_arry[BBR_STAT_SIZE]; +counter_u64_t bbr_opts_arry[BBR_OPTS_SIZE]; +counter_u64_t bbr_out_size[TCP_MSS_ACCT_SIZE]; +counter_u64_t bbr_flows_whdwr_pacing; +counter_u64_t bbr_flows_nohdwr_pacing; + +counter_u64_t bbr_nohdwr_pacing_enobuf; +counter_u64_t bbr_hdwr_pacing_enobuf; + +static inline uint64_t bbr_get_bw(struct tcp_bbr *bbr); + +/* + * Static defintions we need for forward declarations. + */ +static uint32_t +bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain, + uint32_t useconds_time, uint64_t bw); +static uint32_t +bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain); +static void + bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win); +static void +bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses); +static void +bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int line, + int dolog); +static uint32_t +bbr_get_target_cwnd(struct tcp_bbr *bbr, uint64_t bw, uint32_t gain); +static void +bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, + int32_t pkt_epoch, uint32_t losses); +static uint32_t +bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm); +static uint32_t bbr_initial_cwnd(struct tcp_bbr *bbr, struct tcpcb *tp); +static uint32_t +bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, + struct bbr_sendmap *rsm, uint32_t srtt, + uint32_t cts); +static void +bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, + int32_t line); +static void + bbr_set_state_target(struct tcp_bbr *bbr, int line); +static void + bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line); + +static void + bbr_log_progress_event(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t tick, int event, int line); + +static void + tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts); + +static void + bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts); + +static void + bbr_log_rtt_shrinks(struct tcp_bbr *bbr, uint32_t cts, uint32_t applied, uint32_t rtt, + uint32_t line, uint8_t is_start, uint16_t set); + +static struct bbr_sendmap * + bbr_find_lowest_rsm(struct tcp_bbr *bbr); +static __inline uint32_t +bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type); +static void + bbr_log_to_start(struct tcp_bbr *bbr, uint32_t cts, uint32_t to, int32_t slot, uint8_t which); + +static void +bbr_log_timer_var(struct tcp_bbr *bbr, int mode, uint32_t cts, uint32_t time_since_sent, uint32_t srtt, + uint32_t thresh, uint32_t to); +static void + bbr_log_hpts_diag(struct tcp_bbr *bbr, uint32_t cts, struct hpts_diag *diag); + +static void +bbr_log_type_bbrsnd(struct tcp_bbr *bbr, uint32_t len, uint32_t slot, + uint32_t del_by, uint32_t cts, uint32_t sloton, uint32_t prev_delay); + +static void +bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr, + uint32_t cts, int32_t line); +static void + bbr_stop_all_timers(struct tcpcb *tp); +static void + bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts); +static void + bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts); +static void + bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts); + + +static void +bbr_log_pacing_delay_calc(struct tcp_bbr *bbr, uint16_t gain, uint32_t len, + uint32_t cts, uint32_t usecs, uint64_t bw, uint32_t override, int mod); + +static inline uint8_t +bbr_state_val(struct tcp_bbr *bbr) +{ + return(bbr->rc_bbr_substate); +} + +static inline uint32_t +get_min_cwnd(struct tcp_bbr *bbr) +{ + int mss; + + mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); + if (bbr_get_rtt(bbr, BBR_RTT_PROP) < BBR_HIGH_SPEED) + return (bbr_cwnd_min_val_hs * mss); + else + return (bbr_cwnd_min_val * mss); +} + +static uint32_t +bbr_get_persists_timer_val(struct tcpcb *tp, struct tcp_bbr *bbr) +{ + uint64_t srtt, var; + uint64_t ret_val; + + bbr->r_ctl.rc_hpts_flags |= PACE_TMR_PERSIT; + if (tp->t_srtt == 0) { + srtt = (uint64_t)BBR_INITIAL_RTO; + var = 0; + } else { + srtt = ((uint64_t)TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT); + var = ((uint64_t)TICKS_2_USEC(tp->t_rttvar) >> TCP_RTT_SHIFT); + } + TCPT_RANGESET_NOSLOP(ret_val, ((srtt + var) * tcp_backoff[tp->t_rxtshift]), + bbr_persist_min, bbr_persist_max); + return ((uint32_t)ret_val); +} + +static uint32_t +bbr_timer_start(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + /* + * Start the FR timer, we do this based on getting the first one in + * the rc_tmap. Note that if its NULL we must stop the timer. in all + * events we need to stop the running timer (if its running) before + * starting the new one. + */ + uint32_t thresh, exp, to, srtt, time_since_sent, tstmp_touse; + int32_t idx; + int32_t is_tlp_timer = 0; + struct bbr_sendmap *rsm; + + if (bbr->rc_all_timers_stopped) { + /* All timers have been stopped none are to run */ + return (0); + } + if (bbr->rc_in_persist) { + /* We can't start any timer in persists */ + return (bbr_get_persists_timer_val(tp, bbr)); + } + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); + if ((rsm == NULL) || + ((tp->t_flags & TF_SACK_PERMIT) == 0) || + (tp->t_state < TCPS_ESTABLISHED)) { + /* Nothing on the send map */ +activate_rxt: + if (SEQ_LT(tp->snd_una, tp->snd_max) || sbavail(&(tp->t_inpcb->inp_socket->so_snd))) { + uint64_t tov; + + time_since_sent = 0; + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); + if (rsm) { + idx = rsm->r_rtr_cnt - 1; + if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], bbr->r_ctl.rc_tlp_rxt_last_time)) + tstmp_touse = rsm->r_tim_lastsent[idx]; + else + tstmp_touse = bbr->r_ctl.rc_tlp_rxt_last_time; + if (TSTMP_GT(tstmp_touse, cts)) + time_since_sent = cts - tstmp_touse; + } + bbr->r_ctl.rc_hpts_flags |= PACE_TMR_RXT; + if (tp->t_srtt == 0) + tov = BBR_INITIAL_RTO; + else + tov = ((uint64_t)(TICKS_2_USEC(tp->t_srtt) + + ((uint64_t)TICKS_2_USEC(tp->t_rttvar) * (uint64_t)4)) >> TCP_RTT_SHIFT); + if (tp->t_rxtshift) + tov *= tcp_backoff[tp->t_rxtshift]; + if (tov > time_since_sent) + tov -= time_since_sent; + else + tov = bbr->r_ctl.rc_min_to; + TCPT_RANGESET_NOSLOP(to, tov, + (bbr->r_ctl.rc_min_rto_ms * MS_IN_USEC), + (bbr->rc_max_rto_sec * USECS_IN_SECOND)); + bbr_log_timer_var(bbr, 2, cts, 0, srtt, 0, to); + return (to); + } + return (0); + } + if (rsm->r_flags & BBR_ACKED) { + rsm = bbr_find_lowest_rsm(bbr); + if (rsm == NULL) { + /* No lowest? */ + goto activate_rxt; + } + } + /* Convert from ms to usecs */ + if (rsm->r_flags & BBR_SACK_PASSED) { + if ((tp->t_flags & TF_SENTFIN) && + ((tp->snd_max - tp->snd_una) == 1) && + (rsm->r_flags & BBR_HAS_FIN)) { + /* + * We don't start a bbr rack timer if all we have is + * a FIN outstanding. + */ + goto activate_rxt; + } + srtt = bbr_get_rtt(bbr, BBR_RTT_RACK); + thresh = bbr_calc_thresh_rack(bbr, srtt, cts, rsm); + idx = rsm->r_rtr_cnt - 1; + exp = rsm->r_tim_lastsent[idx] + thresh; + if (SEQ_GEQ(exp, cts)) { + to = exp - cts; + if (to < bbr->r_ctl.rc_min_to) { + to = bbr->r_ctl.rc_min_to; + } + } else { + to = bbr->r_ctl.rc_min_to; + } + } else { + /* Ok we need to do a TLP not RACK */ + if (bbr->rc_tlp_in_progress != 0) { + /* + * The previous send was a TLP. + */ + goto activate_rxt; + } + rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext); + if (rsm == NULL) { + /* We found no rsm to TLP with. */ + goto activate_rxt; + } + if (rsm->r_flags & BBR_HAS_FIN) { + /* If its a FIN we don't do TLP */ + rsm = NULL; + goto activate_rxt; + } + time_since_sent = 0; + idx = rsm->r_rtr_cnt - 1; + if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], bbr->r_ctl.rc_tlp_rxt_last_time)) + tstmp_touse = rsm->r_tim_lastsent[idx]; + else + tstmp_touse = bbr->r_ctl.rc_tlp_rxt_last_time; + if (TSTMP_GT(tstmp_touse, cts)) + time_since_sent = cts - tstmp_touse; + is_tlp_timer = 1; + srtt = bbr_get_rtt(bbr, bbr_tlp_type_to_use); + thresh = bbr_calc_thresh_tlp(tp, bbr, rsm, srtt, cts); + if (thresh > time_since_sent) + to = thresh - time_since_sent; + else + to = bbr->r_ctl.rc_min_to; + if (to > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { + /* + * If the TLP time works out to larger than the max + * RTO lets not do TLP.. just RTO. + */ + goto activate_rxt; + } + if ((bbr->rc_tlp_rtx_out == 1) && + (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq)) { + /* + * Second retransmit of the same TLP + * lets not. + */ + bbr->rc_tlp_rtx_out = 0; + goto activate_rxt; + } + if (rsm->r_start != bbr->r_ctl.rc_last_tlp_seq) { + /* + * The tail is no longer the last one I did a probe + * on + */ + bbr->r_ctl.rc_tlp_seg_send_cnt = 0; + bbr->r_ctl.rc_last_tlp_seq = rsm->r_start; + } + } + if (is_tlp_timer == 0) { + BBR_STAT_INC(bbr_to_arm_rack); + bbr->r_ctl.rc_hpts_flags |= PACE_TMR_RACK; + } else { + bbr_log_timer_var(bbr, 1, cts, time_since_sent, srtt, thresh, to); + if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) { + /* + * We have exceeded how many times we can retran the + * current TLP timer, switch to the RTO timer. + */ + goto activate_rxt; + } else { + BBR_STAT_INC(bbr_to_arm_tlp); + bbr->r_ctl.rc_hpts_flags |= PACE_TMR_TLP; + } + } + return (to); +} + +static inline int32_t +bbr_minseg(struct tcp_bbr *bbr) +{ + return (bbr->r_ctl.rc_pace_min_segs - bbr->rc_last_options); +} + +static void +bbr_start_hpts_timer(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts, int32_t frm, int32_t slot, uint32_t tot_len) +{ + struct inpcb *inp; + struct hpts_diag diag; + uint32_t delayed_ack = 0; + uint32_t left = 0; + uint32_t hpts_timeout; + uint8_t stopped; + int32_t delay_calc = 0; + uint32_t prev_delay = 0; + + inp = tp->t_inpcb; + if (inp->inp_in_hpts) { + /* A previous call is already set up */ + return; + } + if ((tp->t_state == TCPS_CLOSED) || + (tp->t_state == TCPS_LISTEN)) { + return; + } + stopped = bbr->rc_tmr_stopped; + if (stopped && TSTMP_GT(bbr->r_ctl.rc_timer_exp, cts)) { + left = bbr->r_ctl.rc_timer_exp - cts; + } + bbr->r_ctl.rc_hpts_flags = 0; + bbr->r_ctl.rc_timer_exp = 0; + prev_delay = bbr->r_ctl.rc_last_delay_val; + if (bbr->r_ctl.rc_last_delay_val && + (slot == 0)) { + /* + * If a previous pacer delay was in place we + * are not coming from the output side (where + * we calculate a delay, more likely a timer). + */ + slot = bbr->r_ctl.rc_last_delay_val; + if (TSTMP_GT(cts, bbr->rc_pacer_started)) { + /* Compensate for time passed */ + delay_calc = cts - bbr->rc_pacer_started; + if (delay_calc <= slot) + slot -= delay_calc; + } + } + /* Do we have early to make up for by pushing out the pacing time? */ + if (bbr->r_agg_early_set) { + bbr_log_pacing_delay_calc(bbr, 0, bbr->r_ctl.rc_agg_early, cts, slot, 0, bbr->r_agg_early_set, 2); + slot += bbr->r_ctl.rc_agg_early; + bbr->r_ctl.rc_agg_early = 0; + bbr->r_agg_early_set = 0; + } + /* Are we running a total debt that needs to be compensated for? */ + if (bbr->r_ctl.rc_hptsi_agg_delay) { + if (slot > bbr->r_ctl.rc_hptsi_agg_delay) { + /* We nuke the delay */ + slot -= bbr->r_ctl.rc_hptsi_agg_delay; + bbr->r_ctl.rc_hptsi_agg_delay = 0; + } else { + /* We nuke some of the delay, put in a minimal 100usecs */ + bbr->r_ctl.rc_hptsi_agg_delay -= slot; + bbr->r_ctl.rc_last_delay_val = slot = 100; + } + } + bbr->r_ctl.rc_last_delay_val = slot; + hpts_timeout = bbr_timer_start(tp, bbr, cts); + if (tp->t_flags & TF_DELACK) { + if (bbr->rc_in_persist == 0) { + delayed_ack = bbr_delack_time; + } else { + /* + * We are in persists and have + * gotten a new data element. + */ + if (hpts_timeout > bbr_delack_time) { + /* + * Lets make the persists timer (which acks) + * be the smaller of hpts_timeout and bbr_delack_time. + */ + hpts_timeout = bbr_delack_time; + } + } + } + if (delayed_ack && + ((hpts_timeout == 0) || + (delayed_ack < hpts_timeout))) { + /* We need a Delayed ack timer */ + bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; + hpts_timeout = delayed_ack; + } + if (slot) { + /* Mark that we have a pacing timer up */ + BBR_STAT_INC(bbr_paced_segments); + bbr->r_ctl.rc_hpts_flags |= PACE_PKT_OUTPUT; + } + /* + * If no timers are going to run and we will fall off thfe hptsi + * wheel, we resort to a keep-alive timer if its configured. + */ + if ((hpts_timeout == 0) && + (slot == 0)) { + if ((tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) && + (tp->t_state <= TCPS_CLOSING)) { + /* + * Ok we have no timer (persists, rack, tlp, rxt or + * del-ack), we don't have segments being paced. So + * all that is left is the keepalive timer. + */ + if (TCPS_HAVEESTABLISHED(tp->t_state)) { + hpts_timeout = TICKS_2_USEC(TP_KEEPIDLE(tp)); + } else { + hpts_timeout = TICKS_2_USEC(TP_KEEPINIT(tp)); + } + bbr->r_ctl.rc_hpts_flags |= PACE_TMR_KEEP; + } + } + if (left && (stopped & (PACE_TMR_KEEP | PACE_TMR_DELACK)) == + (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK)) { + /* + * RACK, TLP, persists and RXT timers all are restartable + * based on actions input .. i.e we received a packet (ack + * or sack) and that changes things (rw, or snd_una etc). + * Thus we can restart them with a new value. For + * keep-alive, delayed_ack we keep track of what was left + * and restart the timer with a smaller value. + */ + if (left < hpts_timeout) + hpts_timeout = left; + } + if (bbr->r_ctl.rc_incr_tmrs && slot && + (bbr->r_ctl.rc_hpts_flags & (PACE_TMR_TLP|PACE_TMR_RXT))) { + /* + * If configured to do so, and the timer is either + * the TLP or RXT timer, we need to increase the timeout + * by the pacing time. Consider the bottleneck at my + * machine as an example, we are sending something + * to start a TLP on. The last packet won't be emitted + * fully until the pacing time (the bottleneck will hold + * the data in place). Once the packet is emitted that + * is when we want to start waiting for the TLP. This + * is most evident with hardware pacing (where the nic + * is holding the packet(s) before emitting). But it + * can also show up in the network so we do it for all + * cases. Technically we would take off one packet from + * this extra delay but this is easier and being more + * conservative is probably better. + */ + hpts_timeout += slot; + } + if (hpts_timeout) { + /* + * Hack alert for now we can't time-out over 2147 seconds (a + * bit more than 35min) + */ + if (hpts_timeout > 0x7ffffffe) + hpts_timeout = 0x7ffffffe; + bbr->r_ctl.rc_timer_exp = cts + hpts_timeout; + } else + bbr->r_ctl.rc_timer_exp = 0; + if ((slot) && + (bbr->rc_use_google || + bbr->output_error_seen || + (slot <= hpts_timeout)) ) { + /* + * Tell LRO that it can queue packets while + * we pace. + */ + bbr->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY; + if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) && + (bbr->rc_cwnd_limited == 0)) { + /* + * If we are not cwnd limited and we + * are running a rack timer we put on + * the do not disturbe even for sack. + */ + inp->inp_flags2 |= INP_DONT_SACK_QUEUE; + } else + inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE; + bbr->rc_pacer_started = cts; + + (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(slot), + __LINE__, &diag); + bbr->rc_timer_first = 0; + bbr->bbr_timer_src = frm; + bbr_log_to_start(bbr, cts, hpts_timeout, slot, 1); + bbr_log_hpts_diag(bbr, cts, &diag); + } else if (hpts_timeout) { + (void)tcp_hpts_insert_diag(tp->t_inpcb, HPTS_USEC_TO_SLOTS(hpts_timeout), + __LINE__, &diag); + /* + * We add the flag here as well if the slot is set, + * since hpts will call in to clear the queue first before + * calling the output routine (which does our timers). + * We don't want to set the flag if its just a timer + * else the arrival of data might (that causes us + * to send more) might get delayed. Imagine being + * on a keep-alive timer and a request comes in for + * more data. + */ + if (slot) + bbr->rc_pacer_started = cts; + if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) && + (bbr->rc_cwnd_limited == 0)) { + /* + * For a rack timer, don't wake us even + * if a sack arrives as long as we are + * not cwnd limited. + */ + bbr->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY; + inp->inp_flags2 |= INP_DONT_SACK_QUEUE; + } else { + /* All other timers wake us up */ + bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY; + inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE; + } + bbr->bbr_timer_src = frm; + bbr_log_to_start(bbr, cts, hpts_timeout, slot, 0); + bbr_log_hpts_diag(bbr, cts, &diag); + bbr->rc_timer_first = 1; + } + bbr->rc_tmr_stopped = 0; + bbr_log_type_bbrsnd(bbr, tot_len, slot, delay_calc, cts, frm, prev_delay); +} + +static void +bbr_timer_audit(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, struct sockbuf *sb) +{ + /* + * We received an ack, and then did not call send or were bounced + * out due to the hpts was running. Now a timer is up as well, is it + * the right timer? + */ + struct inpcb *inp; + struct bbr_sendmap *rsm; + uint32_t hpts_timeout; + int tmr_up; + + tmr_up = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK; + if (bbr->rc_in_persist && (tmr_up == PACE_TMR_PERSIT)) + return; + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); + if (((rsm == NULL) || (tp->t_state < TCPS_ESTABLISHED)) && + (tmr_up == PACE_TMR_RXT)) { + /* Should be an RXT */ + return; + } + inp = bbr->rc_inp; + if (rsm == NULL) { + /* Nothing outstanding? */ + if (tp->t_flags & TF_DELACK) { + if (tmr_up == PACE_TMR_DELACK) + /* + * We are supposed to have delayed ack up + * and we do + */ + return; + } else if (sbavail(&inp->inp_socket->so_snd) && + (tmr_up == PACE_TMR_RXT)) { + /* + * if we hit enobufs then we would expect the + * possiblity of nothing outstanding and the RXT up + * (and the hptsi timer). + */ + return; + } else if (((tcp_always_keepalive || + inp->inp_socket->so_options & SO_KEEPALIVE) && + (tp->t_state <= TCPS_CLOSING)) && + (tmr_up == PACE_TMR_KEEP) && + (tp->snd_max == tp->snd_una)) { + /* We should have keep alive up and we do */ + return; + } + } + if (rsm && (rsm->r_flags & BBR_SACK_PASSED)) { + if ((tp->t_flags & TF_SENTFIN) && + ((tp->snd_max - tp->snd_una) == 1) && + (rsm->r_flags & BBR_HAS_FIN)) { + /* needs to be a RXT */ + if (tmr_up == PACE_TMR_RXT) + return; + else + goto wrong_timer; + } else if (tmr_up == PACE_TMR_RACK) + return; + else + goto wrong_timer; + } else if (rsm && (tmr_up == PACE_TMR_RACK)) { + /* Rack timer has priority if we have data out */ + return; + } else if (SEQ_GT(tp->snd_max, tp->snd_una) && + ((tmr_up == PACE_TMR_TLP) || + (tmr_up == PACE_TMR_RXT))) { + /* + * Either a TLP or RXT is fine if no sack-passed is in place + * and data is outstanding. + */ + return; + } else if (tmr_up == PACE_TMR_DELACK) { + /* + * If the delayed ack was going to go off before the + * rtx/tlp/rack timer were going to expire, then that would + * be the timer in control. Note we don't check the time + * here trusting the code is correct. + */ + return; + } + if (SEQ_GT(tp->snd_max, tp->snd_una) && + ((tmr_up == PACE_TMR_RXT) || + (tmr_up == PACE_TMR_TLP) || + (tmr_up == PACE_TMR_RACK))) { + /* + * We have outstanding data and + * we *do* have a RACK, TLP or RXT + * timer running. We won't restart + * anything here since thats probably ok we + * will get called with some timer here shortly. + */ + return; + } + /* + * Ok the timer originally started is not what we want now. We will + * force the hpts to be stopped if any, and restart with the slot + * set to what was in the saved slot. + */ +wrong_timer: + if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) { + if (inp->inp_in_hpts) + tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); + bbr_timer_cancel(bbr, __LINE__, cts); + bbr_start_hpts_timer(bbr, tp, cts, 1, bbr->r_ctl.rc_last_delay_val, + 0); + } else { + /* + * Output is hptsi so we just need to switch the type of + * timer. We don't bother with keep-alive, since when we + * jump through the output, it will start the keep-alive if + * nothing is sent. + * + * We only need a delayed-ack added and or the hpts_timeout. + */ + hpts_timeout = bbr_timer_start(tp, bbr, cts); + if (tp->t_flags & TF_DELACK) { + if (hpts_timeout == 0) { + hpts_timeout = bbr_delack_time; + bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; + } + else if (hpts_timeout > bbr_delack_time) { + hpts_timeout = bbr_delack_time; + bbr->r_ctl.rc_hpts_flags = PACE_TMR_DELACK; + } + } + if (hpts_timeout) { + if (hpts_timeout > 0x7ffffffe) + hpts_timeout = 0x7ffffffe; + bbr->r_ctl.rc_timer_exp = cts + hpts_timeout; + } + } +} + +int32_t bbr_clear_lost = 0; + +/* + * Considers the two time values now (cts) and earlier. + * If cts is smaller than earlier, we could have + * had a sequence wrap (our counter wraps every + * 70 min or so) or it could be just clock skew + * getting us two differnt time values. Clock skew + * will show up within 10ms or so. So in such + * a case (where cts is behind earlier time by + * less than 10ms) we return 0. Otherwise we + * return the true difference between them. + */ +static inline uint32_t +bbr_calc_time(uint32_t cts, uint32_t earlier_time) { + /* + * Given two timestamps, the current time stamp cts, and some other + * time-stamp taken in theory earlier return the difference. The + * trick is here sometimes locking will get the other timestamp + * after the cts. If this occurs we need to return 0. + */ + if (TSTMP_GEQ(cts, earlier_time)) + return (cts - earlier_time); + /* + * cts is behind earlier_time if its less than 10ms consider it 0. + * If its more than 10ms difference then we had a time wrap. Else + * its just the normal locking foo. I wonder if we should not go to + * 64bit TS and get rid of this issue. + */ + if (TSTMP_GEQ((cts + 10000), earlier_time)) + return (0); + /* + * Ok the time must have wrapped. So we need to answer a large + * amount of time, which the normal subtraction should do. + */ + return (cts - earlier_time); +} + + + +static int +sysctl_bbr_clear_lost(SYSCTL_HANDLER_ARGS) +{ + uint32_t stat; + int32_t error; + + error = SYSCTL_OUT(req, &bbr_clear_lost, sizeof(uint32_t)); + if (error || req->newptr == NULL) + return error; + + error = SYSCTL_IN(req, &stat, sizeof(uint32_t)); + if (error) + return (error); + if (stat == 1) { +#ifdef BBR_INVARIANTS + printf("Clearing BBR lost counters\n"); +#endif + COUNTER_ARRAY_ZERO(bbr_state_lost, BBR_MAX_STAT); + COUNTER_ARRAY_ZERO(bbr_state_time, BBR_MAX_STAT); + COUNTER_ARRAY_ZERO(bbr_state_resend, BBR_MAX_STAT); + } else if (stat == 2) { +#ifdef BBR_INVARIANTS + printf("Clearing BBR option counters\n"); +#endif + COUNTER_ARRAY_ZERO(bbr_opts_arry, BBR_OPTS_SIZE); + } else if (stat == 3) { +#ifdef BBR_INVARIANTS + printf("Clearing BBR stats counters\n"); +#endif + COUNTER_ARRAY_ZERO(bbr_stat_arry, BBR_STAT_SIZE); + } else if (stat == 4) { +#ifdef BBR_INVARIANTS + printf("Clearing BBR out-size counters\n"); +#endif + COUNTER_ARRAY_ZERO(bbr_out_size, TCP_MSS_ACCT_SIZE); + } + bbr_clear_lost = 0; + return (0); +} + +static void +bbr_init_sysctls() +{ + struct sysctl_oid *bbr_probertt; + struct sysctl_oid *bbr_hptsi; + struct sysctl_oid *bbr_measure; + struct sysctl_oid *bbr_cwnd; + struct sysctl_oid *bbr_timeout; + struct sysctl_oid *bbr_states; + struct sysctl_oid *bbr_startup; + struct sysctl_oid *bbr_policer; + + /* Probe rtt controls */ + bbr_probertt = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, + "probertt", + CTLFLAG_RW, 0, + ""); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "gain", CTLFLAG_RW, + &bbr_rttprobe_gain, 192, + "What is the filter gain drop in probe_rtt (0=disable)?"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "cwnd", CTLFLAG_RW, + &bbr_rtt_probe_cwndtarg, 4, + "How many mss's are outstanding during probe-rtt"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "int", CTLFLAG_RW, + &bbr_rtt_probe_limit, 4000000, + "If RTT has not shrank in this many micro-seconds enter probe-rtt"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "mintime", CTLFLAG_RW, + &bbr_rtt_probe_time, 200000, + "How many microseconds in probe-rtt"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "filter_len_sec", CTLFLAG_RW, + &bbr_filter_len_sec, 6, + "How long in seconds does the rttProp filter run?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "drain_rtt", CTLFLAG_RW, + &bbr_drain_rtt, BBR_SRTT, + "What is the drain rtt to use in probeRTT (rtt_prop=0, rtt_rack=1, rtt_pkt=2, rtt_srtt=3?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "can_force", CTLFLAG_RW, + &bbr_can_force_probertt, 0, + "If we keep setting new low rtt's but delay going in probe-rtt can we force in??"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "enter_sets_force", CTLFLAG_RW, + &bbr_probertt_sets_rtt, 0, + "In NF mode, do we imitate google_mode and set the rttProp on entry to probe-rtt?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "can_adjust", CTLFLAG_RW, + &bbr_can_adjust_probertt, 1, + "Can we dynamically adjust the probe-rtt limits and times?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "is_ratio", CTLFLAG_RW, + &bbr_is_ratio, 0, + "is the limit to filter a ratio?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "use_cwnd", CTLFLAG_RW, + &bbr_prtt_slam_cwnd, 0, + "Should we set/recover cwnd?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_probertt), + OID_AUTO, "can_use_ts", CTLFLAG_RW, + &bbr_can_use_ts_for_rtt, 1, + "Can we use the ms timestamp if available for retransmistted rtt calculations?"); + + /* Pacing controls */ + bbr_hptsi = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, + "pacing", + CTLFLAG_RW, 0, + ""); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "hw_pacing", CTLFLAG_RW, + &bbr_allow_hdwr_pacing, 1, + "Do we allow hardware pacing?"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "hw_pacing_limit", CTLFLAG_RW, + &bbr_hardware_pacing_limit, 4000, + "Do we have a limited number of connections for pacing chelsio (0=no limit)?"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "hw_pacing_adj", CTLFLAG_RW, + &bbr_hdwr_pace_adjust, 2, + "Multiplier to calculated tso size?"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "hw_pacing_floor", CTLFLAG_RW, + &bbr_hdwr_pace_floor, 1, + "Do we invoke the hardware pacing floor?"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "hw_pacing_delay_cnt", CTLFLAG_RW, + &bbr_hdwr_pacing_delay_cnt, 10, + "How many packets must be sent after hdwr pacing is enabled"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "bw_cross", CTLFLAG_RW, + &bbr_cross_over, 3000000, + "What is the point where we cross over to linux like TSO size set"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "seg_deltarg", CTLFLAG_RW, + &bbr_hptsi_segments_delay_tar, 7000, + "What is the worse case delay target for hptsi < 48Mbp connections"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "enet_oh", CTLFLAG_RW, + &bbr_include_enet_oh, 0, + "Do we include the ethernet overhead in calculating pacing delay?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "ip_oh", CTLFLAG_RW, + &bbr_include_ip_oh, 1, + "Do we include the IP overhead in calculating pacing delay?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "tcp_oh", CTLFLAG_RW, + &bbr_include_tcp_oh, 0, + "Do we include the TCP overhead in calculating pacing delay?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "google_discount", CTLFLAG_RW, + &bbr_google_discount, 10, + "What is the default google discount percentage wise for pacing (11 = 1.1%%)?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "all_get_min", CTLFLAG_RW, + &bbr_all_get_min, 0, + "If you are less than a MSS do you just get the min?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "tso_min", CTLFLAG_RW, + &bbr_hptsi_bytes_min, 1460, + "For 0 -> 24Mbps what is floor number of segments for TSO"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "seg_tso_max", CTLFLAG_RW, + &bbr_hptsi_segments_max, 6, + "For 0 -> 24Mbps what is top number of segments for TSO"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "seg_floor", CTLFLAG_RW, + &bbr_hptsi_segments_floor, 1, + "Minimum TSO size we will fall too in segments"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "utter_max", CTLFLAG_RW, + &bbr_hptsi_utter_max, 0, + "The absolute maximum that any pacing (outside of hardware) can be"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "seg_divisor", CTLFLAG_RW, + &bbr_hptsi_per_second, 100, + "What is the divisor in our hptsi TSO calculation 512Mbps < X > 24Mbps "); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "srtt_mul", CTLFLAG_RW, + &bbr_hptsi_max_mul, 1, + "The multiplier for pace len max"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_hptsi), + OID_AUTO, "srtt_div", CTLFLAG_RW, + &bbr_hptsi_max_div, 2, + "The divisor for pace len max"); + /* Measurement controls */ + bbr_measure = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, + "measure", + CTLFLAG_RW, 0, + "Measurement controls"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "min_i_bw", CTLFLAG_RW, + &bbr_initial_bw_bps, 62500, + "Minimum initial b/w in bytes per second"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "no_sack_needed", CTLFLAG_RW, + &bbr_sack_not_required, 0, + "Do we allow bbr to run on connections not supporting SACK?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "use_google", CTLFLAG_RW, + &bbr_use_google_algo, 0, + "Use has close to google V1.0 has possible?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "ts_limiting", CTLFLAG_RW, + &bbr_ts_limiting, 1, + "Do we attempt to use the peers timestamp to limit b/w caculations?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "ts_can_raise", CTLFLAG_RW, + &bbr_ts_can_raise, 0, + "Can we raise the b/w via timestamp b/w calculation?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "ts_delta", CTLFLAG_RW, + &bbr_min_usec_delta, 20000, + "How long in usec between ts of our sends in ts validation code?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "ts_peer_delta", CTLFLAG_RW, + &bbr_min_peer_delta, 20, + "What min numerical value should be between the peer deltas?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "ts_delta_percent", CTLFLAG_RW, + &bbr_delta_percent, 150, + "What percentage (150 = 15.0) do we allow variance for?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "min_measure_good_bw", CTLFLAG_RW, + &bbr_min_measurements_req, 1, + "What is the minimum measurment count we need before we switch to our b/w estimate"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "min_measure_before_pace", CTLFLAG_RW, + &bbr_no_pacing_until, 4, + "How many pkt-epoch's (0 is off) do we need before pacing is on?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "quanta", CTLFLAG_RW, + &bbr_quanta, 2, + "Extra quanta to add when calculating the target (ID section 4.2.3.2)."); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_measure), + OID_AUTO, "noretran", CTLFLAG_RW, + &bbr_no_retran, 0, + "Should google mode not use retransmission measurements for the b/w estimation?"); + /* State controls */ + bbr_states = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, + "states", + CTLFLAG_RW, 0, + "State controls"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "idle_restart", CTLFLAG_RW, + &bbr_uses_idle_restart, 0, + "Do we use a new special idle_restart state to ramp back up quickly?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "idle_restart_threshold", CTLFLAG_RW, + &bbr_idle_restart_threshold, 100000, + "How long must we be idle before we restart??"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "use_pkt_epoch", CTLFLAG_RW, + &bbr_state_is_pkt_epoch, 0, + "Do we use a pkt-epoch for substate if 0 rttProp?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "startup_rtt_gain", CTLFLAG_RW, + &bbr_rtt_gain_thresh, 0, + "What increase in RTT triggers us to stop ignoring no-loss and possibly exit startup?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "drain_floor", CTLFLAG_RW, + &bbr_drain_floor, 88, + "What is the lowest we can drain (pg) too?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "drain_2_target", CTLFLAG_RW, + &bbr_state_drain_2_tar, 1, + "Do we drain to target in drain substate?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "gain_2_target", CTLFLAG_RW, + &bbr_gain_to_target, 1, + "Does probe bw gain to target??"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "gain_extra_time", CTLFLAG_RW, + &bbr_gain_gets_extra_too, 1, + "Does probe bw gain get the extra time too?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "ld_div", CTLFLAG_RW, + &bbr_drain_drop_div, 5, + "Long drain drop divider?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "ld_mul", CTLFLAG_RW, + &bbr_drain_drop_mul, 4, + "Long drain drop multiplier?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "rand_ot_disc", CTLFLAG_RW, + &bbr_rand_ot, 50, + "Random discount of the ot?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "dr_filter_life", CTLFLAG_RW, + &bbr_num_pktepo_for_del_limit, BBR_NUM_RTTS_FOR_DEL_LIMIT, + "How many packet-epochs does the b/w delivery rate last?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "subdrain_applimited", CTLFLAG_RW, + &bbr_sub_drain_app_limit, 0, + "Does our sub-state drain invoke app limited if its long?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "use_cwnd_subdrain", CTLFLAG_RW, + &bbr_sub_drain_slam_cwnd, 0, + "Should we set/recover cwnd for sub-state drain?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "use_cwnd_maindrain", CTLFLAG_RW, + &bbr_slam_cwnd_in_main_drain, 0, + "Should we set/recover cwnd for main-state drain?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "google_gets_earlyout", CTLFLAG_RW, + &google_allow_early_out, 1, + "Should we allow google probe-bw/drain to exit early at flight target?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_states), + OID_AUTO, "google_exit_loss", CTLFLAG_RW, + &google_consider_lost, 1, + "Should we have losses exit gain of probebw in google mode??"); + /* Startup controls */ + bbr_startup = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, + "startup", + CTLFLAG_RW, 0, + "Startup controls"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_startup), + OID_AUTO, "cheat_iwnd", CTLFLAG_RW, + &bbr_sends_full_iwnd, 1, + "Do we not pace but burst out initial windows has our TSO size?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_startup), + OID_AUTO, "loss_threshold", CTLFLAG_RW, + &bbr_startup_loss_thresh, 2000, + "In startup what is the loss threshold in a pe that will exit us from startup?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_startup), + OID_AUTO, "use_lowerpg", CTLFLAG_RW, + &bbr_use_lower_gain_in_startup, 1, + "Should we use a lower hptsi gain if we see loss in startup?"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_startup), + OID_AUTO, "gain", CTLFLAG_RW, + &bbr_start_exit, 25, + "What gain percent do we need to see to stay in startup??"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_startup), + OID_AUTO, "low_gain", CTLFLAG_RW, + &bbr_low_start_exit, 15, + "What gain percent do we need to see to stay in the lower gain startup??"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_startup), + OID_AUTO, "loss_exit", CTLFLAG_RW, + &bbr_exit_startup_at_loss, 1, + "Should we exit startup at loss in an epoch if we are not gaining?"); + /* CWND controls */ + bbr_cwnd = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, + "cwnd", + CTLFLAG_RW, 0, + "Cwnd controls"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "tar_rtt", CTLFLAG_RW, + &bbr_cwndtarget_rtt_touse, 0, + "Target cwnd rtt measurment to use (0=rtt_prop, 1=rtt_rack, 2=pkt_rtt, 3=srtt)?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "may_shrink", CTLFLAG_RW, + &bbr_cwnd_may_shrink, 0, + "Can the cwnd shrink if it would grow to more than the target?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "max_target_limit", CTLFLAG_RW, + &bbr_target_cwnd_mult_limit, 8, + "Do we limit the cwnd to some multiple of the cwnd target if cwnd can't shrink 0=no?"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "highspeed_min", CTLFLAG_RW, + &bbr_cwnd_min_val_hs, BBR_HIGHSPEED_NUM_MSS, + "What is the high-speed min cwnd (rttProp under 1ms)"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "lowspeed_min", CTLFLAG_RW, + &bbr_cwnd_min_val, BBR_PROBERTT_NUM_MSS, + "What is the min cwnd (rttProp > 1ms)"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "initwin", CTLFLAG_RW, + &bbr_def_init_win, 10, + "What is the BBR initial window, if 0 use tcp version"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "do_loss_red", CTLFLAG_RW, + &bbr_do_red, 600, + "Do we reduce the b/w at exit from recovery based on ratio of prop/srtt (800=80.0, 0=off)?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "red_scale", CTLFLAG_RW, + &bbr_red_scale, 20000, + "What RTT do we scale with?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "red_growslow", CTLFLAG_RW, + &bbr_red_growth_restrict, 1, + "Do we restrict cwnd growth for whats in flight?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "red_div", CTLFLAG_RW, + &bbr_red_div, 2, + "If we reduce whats the divisor?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "red_mul", CTLFLAG_RW, + &bbr_red_mul, 1, + "If we reduce whats the mulitiplier?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "target_is_unit", CTLFLAG_RW, + &bbr_target_is_bbunit, 0, + "Is the state target the pacing_gain or BBR_UNIT?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_cwnd), + OID_AUTO, "drop_limit", CTLFLAG_RW, + &bbr_drop_limit, 0, + "Number of segments limit for drop (0=use min_cwnd w/flight)?"); + + /* Timeout controls */ + bbr_timeout = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, + "timeout", + CTLFLAG_RW, 0, + "Time out controls"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "delack", CTLFLAG_RW, + &bbr_delack_time, 100000, + "BBR's delayed ack time"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "tlp_uses", CTLFLAG_RW, + &bbr_tlp_type_to_use, 3, + "RTT that TLP uses in its calculations, 0=rttProp, 1=Rack_rtt, 2=pkt_rtt and 3=srtt"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "persmin", CTLFLAG_RW, + &bbr_persist_min, 250000, + "What is the minimum time in microseconds between persists"); + SYSCTL_ADD_U32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "persmax", CTLFLAG_RW, + &bbr_persist_max, 1000000, + "What is the largest delay in microseconds between persists"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "tlp_minto", CTLFLAG_RW, + &bbr_tlp_min, 10000, + "TLP Min timeout in usecs"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "tlp_dack_time", CTLFLAG_RW, + &bbr_delayed_ack_time, 200000, + "TLP delayed ack compensation value"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "minrto", CTLFLAG_RW, + &bbr_rto_min_ms, 30, + "Minimum RTO in ms"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "maxrto", CTLFLAG_RW, + &bbr_rto_max_sec, 4, + "Maxiumum RTO in seconds -- should be at least as large as min_rto"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "tlp_retry", CTLFLAG_RW, + &bbr_tlp_max_resend, 2, + "How many times does TLP retry a single segment or multiple with no ACK"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "minto", CTLFLAG_RW, + &bbr_min_to, 1000, + "Minimum rack timeout in useconds"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "pktdelay", CTLFLAG_RW, + &bbr_pkt_delay, 1000, + "Extra RACK time (in useconds) besides reordering thresh"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "incr_tmrs", CTLFLAG_RW, + &bbr_incr_timers, 1, + "Increase the RXT/TLP timer by the pacing time used?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_timeout), + OID_AUTO, "rxtmark_sackpassed", CTLFLAG_RW, + &bbr_marks_rxt_sack_passed, 0, + "Mark sack passed on all those not ack'd when a RXT hits?"); + /* Policer controls */ + bbr_policer = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, + "policer", + CTLFLAG_RW, 0, + "Policer controls"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_policer), + OID_AUTO, "detect_enable", CTLFLAG_RW, + &bbr_policer_detection_enabled, 1, + "Is policer detection enabled??"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_policer), + OID_AUTO, "min_pes", CTLFLAG_RW, + &bbr_lt_intvl_min_rtts, 4, + "Minimum number of PE's?"); + SYSCTL_ADD_U64(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_policer), + OID_AUTO, "bwdiff", CTLFLAG_RW, + &bbr_lt_bw_diff, (4000/8), + "Minimal bw diff?"); + SYSCTL_ADD_U64(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_policer), + OID_AUTO, "bwratio", CTLFLAG_RW, + &bbr_lt_bw_ratio, 8, + "Minimal bw diff?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_policer), + OID_AUTO, "from_rack_rxt", CTLFLAG_RW, + &bbr_policer_call_from_rack_to, 0, + "Do we call the policer detection code from a rack-timeout?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_policer), + OID_AUTO, "false_postive", CTLFLAG_RW, + &bbr_lt_intvl_fp, 0, + "What packet epoch do we do false-postive detection at (0=no)?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_policer), + OID_AUTO, "loss_thresh", CTLFLAG_RW, + &bbr_lt_loss_thresh, 196, + "Loss threshold 196 = 19.6%?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_policer), + OID_AUTO, "false_postive_thresh", CTLFLAG_RW, + &bbr_lt_fd_thresh, 100, + "What percentage is the false detection threshold (150=15.0)?"); + /* All the rest */ + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "cheat_rxt", CTLFLAG_RW, + &bbr_use_rack_resend_cheat, 0, + "Do we burst 1ms between sends on retransmissions (like rack)?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "error_paceout", CTLFLAG_RW, + &bbr_error_base_paceout, 10000, + "When we hit an error what is the min to pace out in usec's?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "kill_paceout", CTLFLAG_RW, + &bbr_max_net_error_cnt, 10, + "When we hit this many errors in a row, kill the session?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "data_after_close", CTLFLAG_RW, + &bbr_ignore_data_after_close, 1, + "Do we hold off sending a RST until all pending data is ack'd"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "resend_use_tso", CTLFLAG_RW, + &bbr_resends_use_tso, 0, + "Can resends use TSO?"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "sblklimit", CTLFLAG_RW, + &bbr_sack_block_limit, 128, + "When do we start ignoring small sack blocks"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "bb_verbose", CTLFLAG_RW, + &bbr_verbose_logging, 0, + "Should BBR black box logging be verbose"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "reorder_thresh", CTLFLAG_RW, + &bbr_reorder_thresh, 2, + "What factor for rack will be added when seeing reordering (shift right)"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "reorder_fade", CTLFLAG_RW, + &bbr_reorder_fade, 0, + "Does reorder detection fade, if so how many ms (0 means never)"); + SYSCTL_ADD_S32(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "rtt_tlp_thresh", CTLFLAG_RW, + &bbr_tlp_thresh, 1, + "what divisor for TLP rtt/retran will be added (1=rtt, 2=1/2 rtt etc)"); + /* Stats and counters */ + /* The pacing counters for hdwr/software can't be in the array */ + bbr_nohdwr_pacing_enobuf = counter_u64_alloc(M_WAITOK); + bbr_hdwr_pacing_enobuf = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "enob_hdwr_pacing", CTLFLAG_RD, + &bbr_hdwr_pacing_enobuf, + "Total number of enobufs for hardware paced flows"); + SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "enob_no_hdwr_pacing", CTLFLAG_RD, + &bbr_nohdwr_pacing_enobuf, + "Total number of enobufs for non-hardware paced flows"); + + + bbr_flows_whdwr_pacing = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "hdwr_pacing", CTLFLAG_RD, + &bbr_flows_whdwr_pacing, + "Total number of hardware paced flows"); + bbr_flows_nohdwr_pacing = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "software_pacing", CTLFLAG_RD, + &bbr_flows_nohdwr_pacing, + "Total number of software paced flows"); + COUNTER_ARRAY_ALLOC(bbr_stat_arry, BBR_STAT_SIZE, M_WAITOK); + SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "stats", CTLFLAG_RD, + bbr_stat_arry, BBR_STAT_SIZE, "BBR Stats"); + COUNTER_ARRAY_ALLOC(bbr_opts_arry, BBR_OPTS_SIZE, M_WAITOK); + SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "opts", CTLFLAG_RD, + bbr_opts_arry, BBR_OPTS_SIZE, "BBR Option Stats"); + COUNTER_ARRAY_ALLOC(bbr_state_lost, BBR_MAX_STAT, M_WAITOK); + SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "lost", CTLFLAG_RD, + bbr_state_lost, BBR_MAX_STAT, "Stats of when losses occur"); + COUNTER_ARRAY_ALLOC(bbr_state_resend, BBR_MAX_STAT, M_WAITOK); + SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "stateresend", CTLFLAG_RD, + bbr_state_resend, BBR_MAX_STAT, "Stats of what states resend"); + COUNTER_ARRAY_ALLOC(bbr_state_time, BBR_MAX_STAT, M_WAITOK); + SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "statetime", CTLFLAG_RD, + bbr_state_time, BBR_MAX_STAT, "Stats of time spent in the states"); + COUNTER_ARRAY_ALLOC(bbr_out_size, TCP_MSS_ACCT_SIZE, M_WAITOK); + SYSCTL_ADD_COUNTER_U64_ARRAY(&bbr_sysctl_ctx, SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "outsize", CTLFLAG_RD, + bbr_out_size, TCP_MSS_ACCT_SIZE, "Size of output calls"); + SYSCTL_ADD_PROC(&bbr_sysctl_ctx, + SYSCTL_CHILDREN(bbr_sysctl_root), + OID_AUTO, "clrlost", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE, + &bbr_clear_lost, 0, sysctl_bbr_clear_lost, "IU", "Clear lost counters"); +} + +static inline int32_t +bbr_progress_timeout_check(struct tcp_bbr *bbr) +{ + if (bbr->rc_tp->t_maxunacktime && bbr->rc_tp->t_acktime && + TSTMP_GT(ticks, bbr->rc_tp->t_acktime)) { + if ((((uint32_t)ticks - bbr->rc_tp->t_acktime)) >= bbr->rc_tp->t_maxunacktime) { + /* + * There is an assumption here that the caller will + * drop the connection, so we increment the + * statistics. + */ + bbr_log_progress_event(bbr, bbr->rc_tp, ticks, PROGRESS_DROP, __LINE__); + BBR_STAT_INC(bbr_progress_drops); +#ifdef NETFLIX_STATS + TCPSTAT_INC(tcps_progdrops); +#endif + return (1); + } + } + return (0); +} + +static void +bbr_counter_destroy() +{ + COUNTER_ARRAY_FREE(bbr_stat_arry, BBR_STAT_SIZE); + COUNTER_ARRAY_FREE(bbr_opts_arry, BBR_OPTS_SIZE); + COUNTER_ARRAY_FREE(bbr_out_size, TCP_MSS_ACCT_SIZE); + COUNTER_ARRAY_FREE(bbr_state_lost, BBR_MAX_STAT); + COUNTER_ARRAY_FREE(bbr_state_time, BBR_MAX_STAT); + COUNTER_ARRAY_FREE(bbr_state_resend, BBR_MAX_STAT); + counter_u64_free(bbr_flows_whdwr_pacing); + counter_u64_free(bbr_flows_nohdwr_pacing); + +} + +static __inline void +bbr_fill_in_logging_data(struct tcp_bbr *bbr, struct tcp_log_bbr *l, uint32_t cts) +{ + memset(l, 0, sizeof(union tcp_log_stackspecific)); + l->cur_del_rate = bbr->r_ctl.rc_bbr_cur_del_rate; + l->delRate = get_filter_value(&bbr->r_ctl.rc_delrate); + l->rttProp = get_filter_value_small(&bbr->r_ctl.rc_rttprop); + l->bw_inuse = bbr_get_bw(bbr); + l->inflight = ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + l->applimited = bbr->r_ctl.r_app_limited_until; + l->delivered = bbr->r_ctl.rc_delivered; + l->timeStamp = cts; + l->lost = bbr->r_ctl.rc_lost; + l->bbr_state = bbr->rc_bbr_state; + l->bbr_substate = bbr_state_val(bbr); + l->epoch = bbr->r_ctl.rc_rtt_epoch; + l->lt_epoch = bbr->r_ctl.rc_lt_epoch; + l->pacing_gain = bbr->r_ctl.rc_bbr_hptsi_gain; + l->cwnd_gain = bbr->r_ctl.rc_bbr_cwnd_gain; + l->inhpts = bbr->rc_inp->inp_in_hpts; + l->ininput = bbr->rc_inp->inp_in_input; + l->use_lt_bw = bbr->rc_lt_use_bw; + l->pkts_out = bbr->r_ctl.rc_flight_at_input; + l->pkt_epoch = bbr->r_ctl.rc_pkt_epoch; +} + +static void +bbr_log_type_bw_reduce(struct tcp_bbr *bbr, int reason) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = 0; + log.u_bbr.flex2 = 0; + log.u_bbr.flex5 = 0; + log.u_bbr.flex3 = 0; + log.u_bbr.flex4 = bbr->r_ctl.rc_pkt_epoch_loss_rate; + log.u_bbr.flex7 = reason; + log.u_bbr.flex6 = bbr->r_ctl.rc_bbr_enters_probertt; + log.u_bbr.flex8 = 0; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_BW_RED_EV, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_type_rwnd_collapse(struct tcp_bbr *bbr, int seq, int mode, uint32_t count) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = seq; + log.u_bbr.flex2 = count; + log.u_bbr.flex8 = mode; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_LOWGAIN, 0, + 0, &log, false, &bbr->rc_tv); + } +} + + + +static void +bbr_log_type_just_return(struct tcp_bbr *bbr, uint32_t cts, uint32_t tlen, uint8_t hpts_calling, + uint8_t reason, uint32_t p_maxseg, int len) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = p_maxseg; + log.u_bbr.flex2 = bbr->r_ctl.rc_hpts_flags; + log.u_bbr.flex3 = bbr->r_ctl.rc_timer_exp; + log.u_bbr.flex4 = reason; + log.u_bbr.flex5 = bbr->rc_in_persist; + log.u_bbr.flex6 = bbr->r_ctl.rc_last_delay_val; + log.u_bbr.flex7 = p_maxseg; + log.u_bbr.flex8 = bbr->rc_in_persist; + log.u_bbr.pkts_out = 0; + log.u_bbr.applimited = len; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_JUSTRET, 0, + tlen, &log, false, &bbr->rc_tv); + } +} + + +static void +bbr_log_type_enter_rec(struct tcp_bbr *bbr, uint32_t seq) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = seq; + log.u_bbr.flex2 = bbr->r_ctl.rc_cwnd_on_ent; + log.u_bbr.flex3 = bbr->r_ctl.rc_recovery_start; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_ENTREC, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_msgsize_fail(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t len, uint32_t maxseg, uint32_t mtu, int32_t csum_flags, int32_t tso, uint32_t cts) +{ + if (tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = tso; + log.u_bbr.flex2 = maxseg; + log.u_bbr.flex3 = mtu; + log.u_bbr.flex4 = csum_flags; + TCP_LOG_EVENTP(tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_MSGSIZE, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_flowend(struct tcp_bbr *bbr) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + struct sockbuf *r, *s; + struct timeval tv; + + if (bbr->rc_inp->inp_socket) { + r = &bbr->rc_inp->inp_socket->so_rcv; + s = &bbr->rc_inp->inp_socket->so_snd; + } else { + r = s = NULL; + } + bbr_fill_in_logging_data(bbr, &log.u_bbr, tcp_get_usecs(&tv)); + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + r, s, + TCP_LOG_FLOWEND, 0, + 0, &log, false, &tv); + } +} + +static void +bbr_log_pkt_epoch(struct tcp_bbr *bbr, uint32_t cts, uint32_t line, + uint32_t lost, uint32_t del) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = lost; + log.u_bbr.flex2 = del; + log.u_bbr.flex3 = bbr->r_ctl.rc_bbr_lastbtlbw; + log.u_bbr.flex4 = bbr->r_ctl.rc_pkt_epoch_rtt; + log.u_bbr.flex5 = bbr->r_ctl.rc_bbr_last_startup_epoch; + log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; + log.u_bbr.flex7 = line; + log.u_bbr.flex8 = 0; + log.u_bbr.inflight = bbr->r_ctl.r_measurement_count; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_PKT_EPOCH, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_time_epoch(struct tcp_bbr *bbr, uint32_t cts, uint32_t line, uint32_t epoch_time) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = bbr->r_ctl.rc_lost; + log.u_bbr.flex2 = bbr->rc_inp->inp_socket->so_snd.sb_lowat; + log.u_bbr.flex3 = bbr->rc_inp->inp_socket->so_snd.sb_hiwat; + log.u_bbr.flex7 = line; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_TIME_EPOCH, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_set_of_state_target(struct tcp_bbr *bbr, uint32_t new_tar, int line, int meth) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = bbr->r_ctl.rc_target_at_state; + log.u_bbr.flex2 = new_tar; + log.u_bbr.flex3 = line; + log.u_bbr.flex4 = bbr->r_ctl.rc_pace_max_segs; + log.u_bbr.flex5 = bbr_quanta; + log.u_bbr.flex6 = bbr->r_ctl.rc_pace_min_segs; + log.u_bbr.flex7 = bbr->rc_last_options; + log.u_bbr.flex8 = meth; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_STATE_TARGET, 0, + 0, &log, false, &bbr->rc_tv); + } + +} + +static void +bbr_log_type_statechange(struct tcp_bbr *bbr, uint32_t cts, int32_t line) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = line; + log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks; + log.u_bbr.flex3 = bbr->r_ctl.rc_probertt_int; + if (bbr_state_is_pkt_epoch) + log.u_bbr.flex4 = bbr_get_rtt(bbr, BBR_RTT_PKTRTT); + else + log.u_bbr.flex4 = bbr_get_rtt(bbr, BBR_RTT_PROP); + log.u_bbr.flex5 = bbr->r_ctl.rc_bbr_last_startup_epoch; + log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; + log.u_bbr.flex7 = (bbr->r_ctl.rc_target_at_state/1000); + log.u_bbr.lt_epoch = bbr->r_ctl.rc_level_state_extra; + log.u_bbr.pkts_out = bbr->r_ctl.rc_target_at_state; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_STATE, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_rtt_shrinks(struct tcp_bbr *bbr, uint32_t cts, uint32_t applied, + uint32_t rtt, uint32_t line, uint8_t reas, uint16_t cond) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = line; + log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks; + log.u_bbr.flex3 = bbr->r_ctl.last_in_probertt; + log.u_bbr.flex4 = applied; + log.u_bbr.flex5 = rtt; + log.u_bbr.flex6 = bbr->r_ctl.rc_target_at_state; + log.u_bbr.flex7 = cond; + log.u_bbr.flex8 = reas; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_RTT_SHRINKS, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_type_exit_rec(struct tcp_bbr *bbr) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = bbr->r_ctl.rc_recovery_start; + log.u_bbr.flex2 = bbr->r_ctl.rc_cwnd_on_ent; + log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_EXITREC, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_type_cwndupd(struct tcp_bbr *bbr, uint32_t bytes_this_ack, uint32_t chg, + uint32_t prev_acked, int32_t meth, uint32_t target, uint32_t th_ack, int32_t line) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = line; + log.u_bbr.flex2 = prev_acked; + log.u_bbr.flex3 = bytes_this_ack; + log.u_bbr.flex4 = chg; + log.u_bbr.flex5 = th_ack; + log.u_bbr.flex6 = target; + log.u_bbr.flex8 = meth; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_CWND, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_rtt_sample(struct tcp_bbr *bbr, uint32_t rtt, uint32_t tsin) +{ + /* + * Log the rtt sample we are applying to the srtt algorithm in + * useconds. + */ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = rtt; + log.u_bbr.flex2 = bbr->r_ctl.rc_bbr_state_time; + log.u_bbr.flex3 = bbr->r_ctl.rc_ack_hdwr_delay; + log.u_bbr.flex4 = bbr->rc_tp->ts_offset; + log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; + log.u_bbr.pkts_out = tcp_tv_to_mssectick(&bbr->rc_tv); + log.u_bbr.flex6 = tsin; + log.u_bbr.flex7 = 0; + log.u_bbr.flex8 = bbr->rc_ack_was_delayed; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + TCP_LOG_RTT, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_type_pesist(struct tcp_bbr *bbr, uint32_t cts, uint32_t time_in, int32_t line, uint8_t enter_exit) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = time_in; + log.u_bbr.flex2 = line; + log.u_bbr.flex8 = enter_exit; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_PERSIST, 0, + 0, &log, false, &bbr->rc_tv); + } +} +static void +bbr_log_ack_clear(struct tcp_bbr *bbr, uint32_t cts) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = bbr->rc_tp->ts_recent_age; + log.u_bbr.flex2 = bbr->r_ctl.rc_rtt_shrinks; + log.u_bbr.flex3 = bbr->r_ctl.rc_probertt_int; + log.u_bbr.flex4 = bbr->r_ctl.rc_went_idle_time; + log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_ACKCLEAR, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_ack_event(struct tcp_bbr *bbr, struct tcphdr *th, struct tcpopt *to, uint32_t tlen, + uint16_t nsegs, uint32_t cts, int32_t nxt_pkt, struct mbuf *m) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + struct timeval tv; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = nsegs; + log.u_bbr.flex2 = bbr->r_ctl.rc_lost_bytes; + if (m) { + struct timespec ts; + + log.u_bbr.flex3 = m->m_flags; + if (m->m_flags & M_TSTMP) { + mbuf_tstmp2timespec(m, &ts); + tv.tv_sec = ts.tv_sec; + tv.tv_usec = ts.tv_nsec / 1000; + log.u_bbr.lt_epoch = tcp_tv_to_usectick(&tv); + } else { + log.u_bbr.lt_epoch = 0; + } + if (m->m_flags & M_TSTMP_LRO) { + tv.tv_sec = m->m_pkthdr.rcv_tstmp / 1000000000; + tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000) / 1000; + log.u_bbr.flex5 = tcp_tv_to_usectick(&tv); + } else { + /* No arrival timestamp */ + log.u_bbr.flex5 = 0; + } + + log.u_bbr.pkts_out = tcp_get_usecs(&tv); + } else { + log.u_bbr.flex3 = 0; + log.u_bbr.flex5 = 0; + log.u_bbr.flex6 = 0; + log.u_bbr.pkts_out = 0; + } + log.u_bbr.flex4 = bbr->r_ctl.rc_target_at_state; + log.u_bbr.flex7 = bbr->r_wanted_output; + log.u_bbr.flex8 = bbr->rc_in_persist; + TCP_LOG_EVENTP(bbr->rc_tp, th, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + TCP_LOG_IN, 0, + tlen, &log, true, &bbr->rc_tv); + } +} + +static void +bbr_log_doseg_done(struct tcp_bbr *bbr, uint32_t cts, int32_t nxt_pkt, int32_t did_out) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = did_out; + log.u_bbr.flex2 = nxt_pkt; + log.u_bbr.flex3 = bbr->r_ctl.rc_last_delay_val; + log.u_bbr.flex4 = bbr->r_ctl.rc_hpts_flags; + log.u_bbr.flex5 = bbr->r_ctl.rc_timer_exp; + log.u_bbr.flex6 = bbr->r_ctl.rc_lost_bytes; + log.u_bbr.flex7 = bbr->r_wanted_output; + log.u_bbr.flex8 = bbr->rc_in_persist; + log.u_bbr.pkts_out = bbr->r_ctl.highest_hdwr_delay; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_DOSEG_DONE, 0, + 0, &log, true, &bbr->rc_tv); + } +} + +static void +bbr_log_enobuf_jmp(struct tcp_bbr *bbr, uint32_t len, uint32_t cts, + int32_t line, uint32_t o_len, uint32_t segcnt, uint32_t segsiz) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = line; + log.u_bbr.flex2 = o_len; + log.u_bbr.flex3 = segcnt; + log.u_bbr.flex4 = segsiz; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_ENOBUF_JMP, ENOBUFS, + len, &log, true, &bbr->rc_tv); + } +} + +static void +bbr_log_to_processing(struct tcp_bbr *bbr, uint32_t cts, int32_t ret, int32_t timers, uint8_t hpts_calling) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = timers; + log.u_bbr.flex2 = ret; + log.u_bbr.flex3 = bbr->r_ctl.rc_timer_exp; + log.u_bbr.flex4 = bbr->r_ctl.rc_hpts_flags; + log.u_bbr.flex5 = cts; + log.u_bbr.flex6 = bbr->r_ctl.rc_target_at_state; + log.u_bbr.flex8 = hpts_calling; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_TO_PROCESS, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_to_event(struct tcp_bbr *bbr, uint32_t cts, int32_t to_num) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + uint64_t ar; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = bbr->bbr_timer_src; + log.u_bbr.flex2 = 0; + log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; + ar = (uint64_t)(bbr->r_ctl.rc_resend); + ar >>= 32; + ar &= 0x00000000ffffffff; + log.u_bbr.flex4 = (uint32_t)ar; + ar = (uint64_t)bbr->r_ctl.rc_resend; + ar &= 0x00000000ffffffff; + log.u_bbr.flex5 = (uint32_t)ar; + log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); + log.u_bbr.flex8 = to_num; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_RTO, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_startup_event(struct tcp_bbr *bbr, uint32_t cts, uint32_t flex1, uint32_t flex2, uint32_t flex3, uint8_t reason) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = flex1; + log.u_bbr.flex2 = flex2; + log.u_bbr.flex3 = flex3; + log.u_bbr.flex4 = 0; + log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; + log.u_bbr.flex6 = bbr->r_ctl.rc_lost_at_startup; + log.u_bbr.flex8 = reason; + log.u_bbr.cur_del_rate = bbr->r_ctl.rc_bbr_lastbtlbw; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_REDUCE, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_hpts_diag(struct tcp_bbr *bbr, uint32_t cts, struct hpts_diag *diag) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = diag->p_nxt_slot; + log.u_bbr.flex2 = diag->p_cur_slot; + log.u_bbr.flex3 = diag->slot_req; + log.u_bbr.flex4 = diag->inp_hptsslot; + log.u_bbr.flex5 = diag->slot_remaining; + log.u_bbr.flex6 = diag->need_new_to; + log.u_bbr.flex7 = diag->p_hpts_active; + log.u_bbr.flex8 = diag->p_on_min_sleep; + /* Hijack other fields as needed */ + log.u_bbr.epoch = diag->have_slept; + log.u_bbr.lt_epoch = diag->yet_to_sleep; + log.u_bbr.pkts_out = diag->co_ret; + log.u_bbr.applimited = diag->hpts_sleep_time; + log.u_bbr.delivered = diag->p_prev_slot; + log.u_bbr.inflight = diag->p_runningtick; + log.u_bbr.bw_inuse = diag->wheel_tick; + log.u_bbr.rttProp = diag->wheel_cts; + log.u_bbr.delRate = diag->maxticks; + log.u_bbr.cur_del_rate = diag->p_curtick; + log.u_bbr.cur_del_rate <<= 32; + log.u_bbr.cur_del_rate |= diag->p_lasttick; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_HPTSDIAG, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_timer_var(struct tcp_bbr *bbr, int mode, uint32_t cts, uint32_t time_since_sent, uint32_t srtt, + uint32_t thresh, uint32_t to) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = bbr->rc_tp->t_rttvar; + log.u_bbr.flex2 = time_since_sent; + log.u_bbr.flex3 = srtt; + log.u_bbr.flex4 = thresh; + log.u_bbr.flex5 = to; + log.u_bbr.flex6 = bbr->rc_tp->t_srtt; + log.u_bbr.flex8 = mode; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_TIMERPREP, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_pacing_delay_calc(struct tcp_bbr *bbr, uint16_t gain, uint32_t len, + uint32_t cts, uint32_t usecs, uint64_t bw, uint32_t override, int mod) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = usecs; + log.u_bbr.flex2 = len; + log.u_bbr.flex3 = (uint32_t)((bw >> 32) & 0x00000000ffffffff); + log.u_bbr.flex4 = (uint32_t)(bw & 0x00000000ffffffff); + if (override) + log.u_bbr.flex5 = (1 << 2); + else + log.u_bbr.flex5 = 0; + log.u_bbr.flex6 = override; + log.u_bbr.flex7 = gain; + log.u_bbr.flex8 = mod; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_HPTSI_CALC, 0, + len, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_to_start(struct tcp_bbr *bbr, uint32_t cts, uint32_t to, int32_t slot, uint8_t which) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + + log.u_bbr.flex1 = bbr->bbr_timer_src; + log.u_bbr.flex2 = to; + log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; + log.u_bbr.flex4 = slot; + log.u_bbr.flex5 = bbr->rc_inp->inp_hptsslot; + log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); + log.u_bbr.pkts_out = bbr->rc_inp->inp_flags2; + log.u_bbr.flex8 = which; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_TIMERSTAR, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_thresh_choice(struct tcp_bbr *bbr, uint32_t cts, uint32_t thresh, uint32_t lro, uint32_t srtt, struct bbr_sendmap *rsm, uint8_t frm) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = thresh; + log.u_bbr.flex2 = lro; + log.u_bbr.flex3 = bbr->r_ctl.rc_reorder_ts; + log.u_bbr.flex4 = rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]; + log.u_bbr.flex5 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); + log.u_bbr.flex6 = srtt; + log.u_bbr.flex7 = bbr->r_ctl.rc_reorder_shift; + log.u_bbr.flex8 = frm; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_THRESH_CALC, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_to_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts, uint8_t hpts_removed) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = line; + log.u_bbr.flex2 = bbr->bbr_timer_src; + log.u_bbr.flex3 = bbr->r_ctl.rc_hpts_flags; + log.u_bbr.flex4 = bbr->rc_in_persist; + log.u_bbr.flex5 = bbr->r_ctl.rc_target_at_state; + log.u_bbr.flex6 = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); + log.u_bbr.flex8 = hpts_removed; + log.u_bbr.pkts_out = bbr->rc_pacer_started; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_TIMERCANC, 0, + 0, &log, false, &bbr->rc_tv); + } +} + + +static void +bbr_log_tstmp_validation(struct tcp_bbr *bbr, uint64_t peer_delta, uint64_t delta) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = bbr->r_ctl.bbr_peer_tsratio; + log.u_bbr.flex2 = (peer_delta >> 32); + log.u_bbr.flex3 = (peer_delta & 0x00000000ffffffff); + log.u_bbr.flex4 = (delta >> 32); + log.u_bbr.flex5 = (delta & 0x00000000ffffffff); + log.u_bbr.flex7 = bbr->rc_ts_clock_set; + log.u_bbr.flex8 = bbr->rc_ts_cant_be_used; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_TSTMP_VAL, 0, + 0, &log, false, &bbr->rc_tv); + + } +} + +static void +bbr_log_type_tsosize(struct tcp_bbr *bbr, uint32_t cts, uint32_t tsosz, uint32_t tls, uint32_t old_val, uint32_t maxseg, int hdwr) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = tsosz; + log.u_bbr.flex2 = tls; + log.u_bbr.flex3 = tcp_min_hptsi_time; + log.u_bbr.flex4 = bbr->r_ctl.bbr_hptsi_bytes_min; + log.u_bbr.flex5 = old_val; + log.u_bbr.flex6 = maxseg; + log.u_bbr.flex7 = bbr->rc_no_pacing; + log.u_bbr.flex7 <<= 1; + log.u_bbr.flex7 |= bbr->rc_past_init_win; + if (hdwr) + log.u_bbr.flex8 = 0x80 | bbr->rc_use_google; + else + log.u_bbr.flex8 = bbr->rc_use_google; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_BBRTSO, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_type_rsmclear(struct tcp_bbr *bbr, uint32_t cts, struct bbr_sendmap *rsm, + uint32_t flags, uint32_t line) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = line; + log.u_bbr.flex2 = rsm->r_start; + log.u_bbr.flex3 = rsm->r_end; + log.u_bbr.flex4 = rsm->r_delivered; + log.u_bbr.flex5 = rsm->r_rtr_cnt; + log.u_bbr.flex6 = rsm->r_dupack; + log.u_bbr.flex7 = rsm->r_tim_lastsent[0]; + log.u_bbr.flex8 = rsm->r_flags; + /* Hijack the pkts_out fids */ + log.u_bbr.applimited = flags; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_RSM_CLEARED, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_type_bbrupd(struct tcp_bbr *bbr, uint8_t flex8, uint32_t cts, + uint32_t flex3, uint32_t flex2, uint32_t flex5, + uint32_t flex6, uint32_t pkts_out, int flex7, + uint32_t flex4, uint32_t flex1) +{ + + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = flex1; + log.u_bbr.flex2 = flex2; + log.u_bbr.flex3 = flex3; + log.u_bbr.flex4 = flex4; + log.u_bbr.flex5 = flex5; + log.u_bbr.flex6 = flex6; + log.u_bbr.flex7 = flex7; + /* Hijack the pkts_out fids */ + log.u_bbr.pkts_out = pkts_out; + log.u_bbr.flex8 = flex8; + if (bbr->rc_ack_was_delayed) + log.u_bbr.epoch = bbr->r_ctl.rc_ack_hdwr_delay; + else + log.u_bbr.epoch = 0; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_BBRUPD, 0, + flex2, &log, false, &bbr->rc_tv); + } +} + + +static void +bbr_log_type_ltbw(struct tcp_bbr *bbr, uint32_t cts, int32_t reason, + uint32_t newbw, uint32_t obw, uint32_t diff, + uint32_t tim) +{ + if (/*bbr_verbose_logging && */(bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = reason; + log.u_bbr.flex2 = newbw; + log.u_bbr.flex3 = obw; + log.u_bbr.flex4 = diff; + log.u_bbr.flex5 = bbr->r_ctl.rc_lt_lost; + log.u_bbr.flex6 = bbr->r_ctl.rc_lt_del; + log.u_bbr.flex7 = bbr->rc_lt_is_sampling; + log.u_bbr.pkts_out = tim; + log.u_bbr.bw_inuse = bbr->r_ctl.rc_lt_bw; + if (bbr->rc_lt_use_bw == 0) + log.u_bbr.epoch = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch; + else + log.u_bbr.epoch = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch_use; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_BWSAMP, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static inline void +bbr_log_progress_event(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t tick, int event, int line) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + log.u_bbr.flex1 = line; + log.u_bbr.flex2 = tick; + log.u_bbr.flex3 = tp->t_maxunacktime; + log.u_bbr.flex4 = tp->t_acktime; + log.u_bbr.flex8 = event; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_PROGRESS, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_type_log_hdwr_pacing(struct tcp_bbr *bbr, const struct ifnet *ifp, + uint64_t rate, uint64_t hw_rate, int line, uint32_t cts, + int error) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = ((hw_rate >> 32) & 0x00000000ffffffff); + log.u_bbr.flex2 = (hw_rate & 0x00000000ffffffff); + log.u_bbr.flex3 = (((uint64_t)ifp >> 32) & 0x00000000ffffffff); + log.u_bbr.flex4 = ((uint64_t)ifp & 0x00000000ffffffff); + log.u_bbr.bw_inuse = rate; + log.u_bbr.flex5 = line; + log.u_bbr.flex6 = error; + log.u_bbr.flex8 = bbr->skip_gain; + log.u_bbr.flex8 <<= 1; + log.u_bbr.flex8 |= bbr->gain_is_limited; + log.u_bbr.flex8 <<= 1; + log.u_bbr.flex8 |= bbr->bbr_hdrw_pacing; + log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_HDWR_PACE, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_type_bbrsnd(struct tcp_bbr *bbr, uint32_t len, uint32_t slot, uint32_t del_by, uint32_t cts, uint32_t line, uint32_t prev_delay) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = slot; + log.u_bbr.flex2 = del_by; + log.u_bbr.flex3 = prev_delay; + log.u_bbr.flex4 = line; + log.u_bbr.flex5 = bbr->r_ctl.rc_last_delay_val; + log.u_bbr.flex6 = bbr->r_ctl.rc_hptsi_agg_delay; + log.u_bbr.flex7 = (0x0000ffff & bbr->r_ctl.rc_hpts_flags); + log.u_bbr.flex8 = bbr->rc_in_persist; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_BBRSND, 0, + len, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_type_bbrrttprop(struct tcp_bbr *bbr, uint32_t t, uint32_t end, uint32_t tsconv, uint32_t cts, int32_t match, uint32_t seq, uint8_t flags) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = bbr->r_ctl.rc_delivered; + log.u_bbr.flex2 = 0; + log.u_bbr.flex3 = bbr->r_ctl.rc_lowest_rtt; + log.u_bbr.flex4 = end; + log.u_bbr.flex5 = seq; + log.u_bbr.flex6 = t; + log.u_bbr.flex7 = match; + log.u_bbr.flex8 = flags; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_BBRRTT, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_exit_gain(struct tcp_bbr *bbr, uint32_t cts, int32_t entry_method) +{ + if (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = bbr->r_ctl.rc_target_at_state; + log.u_bbr.flex2 = (bbr->rc_tp->t_maxseg - bbr->rc_last_options); + log.u_bbr.flex3 = bbr->r_ctl.gain_epoch; + log.u_bbr.flex4 = bbr->r_ctl.rc_pace_max_segs; + log.u_bbr.flex5 = bbr->r_ctl.rc_pace_min_segs; + log.u_bbr.flex6 = bbr->r_ctl.rc_bbr_state_atflight; + log.u_bbr.flex7 = 0; + log.u_bbr.flex8 = entry_method; + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_EXIT_GAIN, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +static void +bbr_log_settings_change(struct tcp_bbr *bbr, int settings_desired) +{ + if (bbr_verbose_logging && (bbr->rc_tp->t_logstate != TCP_LOG_STATE_OFF)) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, bbr->r_ctl.rc_rcvtime); + /* R-HU */ + log.u_bbr.flex1 = 0; + log.u_bbr.flex2 = 0; + log.u_bbr.flex3 = 0; + log.u_bbr.flex4 = 0; + log.u_bbr.flex7 = 0; + log.u_bbr.flex8 = settings_desired; + + TCP_LOG_EVENTP(bbr->rc_tp, NULL, + &bbr->rc_inp->inp_socket->so_rcv, + &bbr->rc_inp->inp_socket->so_snd, + BBR_LOG_SETTINGS_CHG, 0, + 0, &log, false, &bbr->rc_tv); + } +} + +/* + * Returns the bw from the our filter. + */ +static inline uint64_t +bbr_get_full_bw(struct tcp_bbr *bbr) +{ + uint64_t bw; + + bw = get_filter_value(&bbr->r_ctl.rc_delrate); + + return (bw); +} + +static inline void +bbr_set_pktepoch(struct tcp_bbr *bbr, uint32_t cts, int32_t line) +{ + uint64_t calclr; + uint32_t lost, del; + + if (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_pktepoch) + lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lost_at_pktepoch; + else + lost = 0; + del = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_pkt_epoch_del; + if (lost == 0) { + calclr = 0; + } else if (del) { + calclr = lost; + calclr *= (uint64_t)1000; + calclr /= (uint64_t)del; + } else { + /* Nothing delivered? 100.0% loss */ + calclr = 1000; + } + bbr->r_ctl.rc_pkt_epoch_loss_rate = (uint32_t)calclr; + if (IN_RECOVERY(bbr->rc_tp->t_flags)) + bbr->r_ctl.recovery_lr += (uint32_t)calclr; + bbr->r_ctl.rc_pkt_epoch++; + if (bbr->rc_no_pacing && + (bbr->r_ctl.rc_pkt_epoch >= bbr->no_pacing_until)) { + bbr->rc_no_pacing = 0; + tcp_bbr_tso_size_check(bbr, cts); + } + bbr->r_ctl.rc_pkt_epoch_rtt = bbr_calc_time(cts, bbr->r_ctl.rc_pkt_epoch_time); + bbr->r_ctl.rc_pkt_epoch_time = cts; + /* What was our loss rate */ + bbr_log_pkt_epoch(bbr, cts, line, lost, del); + bbr->r_ctl.rc_pkt_epoch_del = bbr->r_ctl.rc_delivered; + bbr->r_ctl.rc_lost_at_pktepoch = bbr->r_ctl.rc_lost; +} + +static inline void +bbr_set_epoch(struct tcp_bbr *bbr, uint32_t cts, int32_t line) +{ + uint32_t epoch_time; + + /* Tick the RTT clock */ + bbr->r_ctl.rc_rtt_epoch++; + epoch_time = cts - bbr->r_ctl.rc_rcv_epoch_start; + bbr_log_time_epoch(bbr, cts, line, epoch_time); + bbr->r_ctl.rc_rcv_epoch_start = cts; +} + + +static inline void +bbr_isit_a_pkt_epoch(struct tcp_bbr *bbr, uint32_t cts, struct bbr_sendmap *rsm, int32_t line, int32_t cum_acked) +{ + if (SEQ_GEQ(rsm->r_delivered, bbr->r_ctl.rc_pkt_epoch_del)) { + bbr->rc_is_pkt_epoch_now = 1; + } +} + +/* + * Returns the bw from either the b/w filter + * or from the lt_bw (if the connection is being + * policed). + */ +static inline uint64_t +__bbr_get_bw(struct tcp_bbr *bbr) +{ + uint64_t bw, min_bw; + uint64_t rtt; + int gm_measure_cnt = 1; + + /* + * For startup we make, like google, a + * minimum b/w. This is generated from the + * IW and the rttProp. We do fall back to srtt + * if for some reason (initial handshake) we don't + * have a rttProp. We, in the worst case, fall back + * to the configured min_bw (rc_initial_hptsi_bw). + */ + if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { + /* Attempt first to use rttProp */ + rtt = (uint64_t)get_filter_value_small(&bbr->r_ctl.rc_rttprop); + if (rtt && (rtt < 0xffffffff)) { +measure: + min_bw = (uint64_t)(bbr_initial_cwnd(bbr, bbr->rc_tp)) * + ((uint64_t)1000000); + min_bw /= rtt; + if (min_bw < bbr->r_ctl.rc_initial_hptsi_bw) { + min_bw = bbr->r_ctl.rc_initial_hptsi_bw; + } + + } else if (bbr->rc_tp->t_srtt != 0) { + /* No rttProp, use srtt? */ + rtt = bbr_get_rtt(bbr, BBR_SRTT); + goto measure; + } else { + min_bw = bbr->r_ctl.rc_initial_hptsi_bw; + } + } else + min_bw = 0; + + if ((bbr->rc_past_init_win == 0) && + (bbr->r_ctl.rc_delivered > bbr_initial_cwnd(bbr, bbr->rc_tp))) + bbr->rc_past_init_win = 1; + if ((bbr->rc_use_google) && (bbr->r_ctl.r_measurement_count >= 1)) + gm_measure_cnt = 0; + if (gm_measure_cnt && + ((bbr->r_ctl.r_measurement_count < bbr_min_measurements_req) || + (bbr->rc_past_init_win == 0))) { + /* For google we use our guess rate until we get 1 measurement */ + +use_initial_window: + rtt = (uint64_t)get_filter_value_small(&bbr->r_ctl.rc_rttprop); + if (rtt && (rtt < 0xffffffff)) { + /* + * We have an RTT measurment. Use that in + * combination with our initial window to calculate + * a b/w. + */ + bw = (uint64_t)(bbr_initial_cwnd(bbr, bbr->rc_tp)) * + ((uint64_t)1000000); + bw /= rtt; + if (bw < bbr->r_ctl.rc_initial_hptsi_bw) { + bw = bbr->r_ctl.rc_initial_hptsi_bw; + } + } else { + /* Drop back to the 40 and punt to a default */ + bw = bbr->r_ctl.rc_initial_hptsi_bw; + } + if (bw < 1) + /* Probably should panic */ + bw = 1; + if (bw > min_bw) + return (bw); + else + return (min_bw); + } + if (bbr->rc_lt_use_bw) + bw = bbr->r_ctl.rc_lt_bw; + else if (bbr->r_recovery_bw && (bbr->rc_use_google == 0)) + bw = bbr->r_ctl.red_bw; + else + bw = get_filter_value(&bbr->r_ctl.rc_delrate); + if (bbr->rc_tp->t_peakrate_thr && (bbr->rc_use_google == 0)) { + /* + * Enforce user set rate limit, keep in mind that + * t_peakrate_thr is in B/s already + */ + bw = uqmin((uint64_t)bbr->rc_tp->t_peakrate_thr, bw); + } + if (bw == 0) { + /* We should not be at 0, go to the initial window then */ + goto use_initial_window; + } + if (bw < 1) + /* Probably should panic */ + bw = 1; + if (bw < min_bw) + bw = min_bw; + return (bw); +} + +static inline uint64_t +bbr_get_bw(struct tcp_bbr *bbr) +{ + uint64_t bw; + + bw = __bbr_get_bw(bbr); + return (bw); +} + +static inline void +bbr_reset_lt_bw_interval(struct tcp_bbr *bbr, uint32_t cts) +{ + bbr->r_ctl.rc_lt_epoch = bbr->r_ctl.rc_pkt_epoch; + bbr->r_ctl.rc_lt_time = bbr->r_ctl.rc_del_time; + bbr->r_ctl.rc_lt_del = bbr->r_ctl.rc_delivered; + bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; +} + +static inline void +bbr_reset_lt_bw_sampling(struct tcp_bbr *bbr, uint32_t cts) +{ + bbr->rc_lt_is_sampling = 0; + bbr->rc_lt_use_bw = 0; + bbr->r_ctl.rc_lt_bw = 0; + bbr_reset_lt_bw_interval(bbr, cts); +} + +static inline void +bbr_lt_bw_samp_done(struct tcp_bbr *bbr, uint64_t bw, uint32_t cts, uint32_t timin) +{ + uint64_t diff; + + /* Do we have a previous sample? */ + if (bbr->r_ctl.rc_lt_bw) { + /* Get the diff in bytes per second */ + if (bbr->r_ctl.rc_lt_bw > bw) + diff = bbr->r_ctl.rc_lt_bw - bw; + else + diff = bw - bbr->r_ctl.rc_lt_bw; + if ((diff <= bbr_lt_bw_diff) || + (diff <= (bbr->r_ctl.rc_lt_bw / bbr_lt_bw_ratio))) { + /* Consider us policed */ + uint32_t saved_bw; + + saved_bw = (uint32_t)bbr->r_ctl.rc_lt_bw; + bbr->r_ctl.rc_lt_bw = (bw + bbr->r_ctl.rc_lt_bw) / 2; /* average of two */ + bbr->rc_lt_use_bw = 1; + bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; + /* + * Use pkt based epoch for measuring length of + * policer up + */ + bbr->r_ctl.rc_lt_epoch_use = bbr->r_ctl.rc_pkt_epoch; + /* + * reason 4 is we need to start consider being + * policed + */ + bbr_log_type_ltbw(bbr, cts, 4, (uint32_t)bw, saved_bw, (uint32_t)diff, timin); + return; + } + } + bbr->r_ctl.rc_lt_bw = bw; + bbr_reset_lt_bw_interval(bbr, cts); + bbr_log_type_ltbw(bbr, cts, 5, 0, (uint32_t)bw, 0, timin); +} + +/* + * RRS: Copied from user space! + * Calculate a uniformly distributed random number less than upper_bound + * avoiding "modulo bias". + * + * Uniformity is achieved by generating new random numbers until the one + * returned is outside the range [0, 2**32 % upper_bound). This + * guarantees the selected random number will be inside + * [2**32 % upper_bound, 2**32) which maps back to [0, upper_bound) + * after reduction modulo upper_bound. + */ +static uint32_t +arc4random_uniform(uint32_t upper_bound) +{ + uint32_t r, min; + + if (upper_bound < 2) + return 0; + + /* 2**32 % x == (2**32 - x) % x */ + min = -upper_bound % upper_bound; + + /* + * This could theoretically loop forever but each retry has + * p > 0.5 (worst case, usually far better) of selecting a + * number inside the range we need, so it should rarely need + * to re-roll. + */ + for (;;) { + r = arc4random(); + if (r >= min) + break; + } + + return r % upper_bound; +} + +static void +bbr_randomize_extra_state_time(struct tcp_bbr *bbr) +{ + uint32_t ran, deduct; + + ran = arc4random_uniform(bbr_rand_ot); + if (ran) { + deduct = bbr->r_ctl.rc_level_state_extra / ran; + bbr->r_ctl.rc_level_state_extra -= deduct; + } +} +/* + * Return randomly the starting state + * to use in probebw. + */ +static uint8_t +bbr_pick_probebw_substate(struct tcp_bbr *bbr, uint32_t cts) +{ + uint32_t ran; + uint8_t ret_val; + + /* Initialize the offset to 0 */ + bbr->r_ctl.rc_exta_time_gd = 0; + bbr->rc_hit_state_1 = 0; + bbr->r_ctl.rc_level_state_extra = 0; + ran = arc4random_uniform((BBR_SUBSTATE_COUNT-1)); + /* + * The math works funny here :) the return value is used to set the + * substate and then the state change is called which increments by + * one. So if we return 1 (DRAIN) we will increment to 2 (LEVEL1) when + * we fully enter the state. Note that the (8 - 1 - ran) assures that + * we return 1 - 7, so we dont return 0 and end up starting in + * state 1 (DRAIN). + */ + ret_val = BBR_SUBSTATE_COUNT - 1 - ran; + /* Set an epoch */ + if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP)) + bbr_set_epoch(bbr, cts, __LINE__); + + bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; + return (ret_val); +} + +static void +bbr_lt_bw_sampling(struct tcp_bbr *bbr, uint32_t cts, int32_t loss_detected) +{ + uint32_t diff, d_time; + uint64_t del_time, bw, lost, delivered; + + if (bbr->r_use_policer == 0) + return; + if (bbr->rc_lt_use_bw) { + /* We are using lt bw do we stop yet? */ + diff = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch_use; + if (diff > bbr_lt_bw_max_rtts) { + /* Reset it all */ +reset_all: + bbr_reset_lt_bw_sampling(bbr, cts); + if (bbr->rc_filled_pipe) { + bbr_set_epoch(bbr, cts, __LINE__); + bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); + bbr_substate_change(bbr, cts, __LINE__, 0); + bbr->rc_bbr_state = BBR_STATE_PROBE_BW; + bbr_log_type_statechange(bbr, cts, __LINE__); + } else { + /* + * This should not happen really + * unless we remove the startup/drain + * restrictions above. + */ + bbr->rc_bbr_state = BBR_STATE_STARTUP; + bbr_set_epoch(bbr, cts, __LINE__); + bbr->r_ctl.rc_bbr_state_time = cts; + bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; + bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; + bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; + bbr_set_state_target(bbr, __LINE__); + bbr_log_type_statechange(bbr, cts, __LINE__); + } + /* reason 0 is to stop using lt-bw */ + bbr_log_type_ltbw(bbr, cts, 0, 0, 0, 0, 0); + return; + } + if (bbr_lt_intvl_fp == 0) { + /* Not doing false-postive detection */ + return; + } + /* False positive detection */ + if (diff == bbr_lt_intvl_fp) { + /* At bbr_lt_intvl_fp we record the lost */ + bbr->r_ctl.rc_lt_del = bbr->r_ctl.rc_delivered; + bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; + } else if (diff > (bbr_lt_intvl_min_rtts + bbr_lt_intvl_fp)) { + /* Now is our loss rate still high? */ + lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lt_lost; + delivered = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_lt_del; + if ((delivered == 0) || + (((lost * 1000)/delivered) < bbr_lt_fd_thresh)) { + /* No still below our threshold */ + bbr_log_type_ltbw(bbr, cts, 7, lost, delivered, 0, 0); + } else { + /* Yikes its still high, it must be a false positive */ + bbr_log_type_ltbw(bbr, cts, 8, lost, delivered, 0, 0); + goto reset_all; + } + } + return; + } + /* + * Wait for the first loss before sampling, to let the policer + * exhaust its tokens and estimate the steady-state rate allowed by + * the policer. Starting samples earlier includes bursts that + * over-estimate the bw. + */ + if (bbr->rc_lt_is_sampling == 0) { + /* reason 1 is to begin doing the sampling */ + if (loss_detected == 0) + return; + bbr_reset_lt_bw_interval(bbr, cts); + bbr->rc_lt_is_sampling = 1; + bbr_log_type_ltbw(bbr, cts, 1, 0, 0, 0, 0); + return; + } + /* Now how long were we delivering long term last> */ + if (TSTMP_GEQ(bbr->r_ctl.rc_del_time, bbr->r_ctl.rc_lt_time)) + d_time = bbr->r_ctl.rc_del_time - bbr->r_ctl.rc_lt_time; + else + d_time = 0; + + /* To avoid underestimates, reset sampling if we run out of data. */ + if (bbr->r_ctl.r_app_limited_until) { + /* Can not measure in app-limited state */ + bbr_reset_lt_bw_sampling(bbr, cts); + /* reason 2 is to reset sampling due to app limits */ + bbr_log_type_ltbw(bbr, cts, 2, 0, 0, 0, d_time); + return; + } + diff = bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_lt_epoch; + if (diff < bbr_lt_intvl_min_rtts) { + /* + * need more samples (we don't + * start on a round like linux so + * we need 1 more). + */ + /* 6 is not_enough time or no-loss */ + bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); + return; + } + if (diff > (4 * bbr_lt_intvl_min_rtts)) { + /* + * For now if we wait too long, reset all sampling. We need + * to do some research here, its possible that we should + * base this on how much loss as occurred.. something like + * if its under 10% (or some thresh) reset all otherwise + * don't. Thats for phase II I guess. + */ + bbr_reset_lt_bw_sampling(bbr, cts); + /* reason 3 is to reset sampling due too long of sampling */ + bbr_log_type_ltbw(bbr, cts, 3, 0, 0, 0, d_time); + return; + } + /* + * End sampling interval when a packet is lost, so we estimate the + * policer tokens were exhausted. Stopping the sampling before the + * tokens are exhausted under-estimates the policed rate. + */ + if (loss_detected == 0) { + /* 6 is not_enough time or no-loss */ + bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); + return; + } + /* Calculate packets lost and delivered in sampling interval. */ + lost = bbr->r_ctl.rc_lost - bbr->r_ctl.rc_lt_lost; + delivered = bbr->r_ctl.rc_delivered - bbr->r_ctl.rc_lt_del; + if ((delivered == 0) || + (((lost * 1000)/delivered) < bbr_lt_loss_thresh)) { + bbr_log_type_ltbw(bbr, cts, 6, lost, delivered, 0, d_time); + return; + } + if (d_time < 1000) { + /* Not enough time. wait */ + /* 6 is not_enough time or no-loss */ + bbr_log_type_ltbw(bbr, cts, 6, 0, 0, 0, d_time); + return; + } + if (d_time >= (0xffffffff / USECS_IN_MSEC)) { + /* Too long */ + bbr_reset_lt_bw_sampling(bbr, cts); + /* reason 3 is to reset sampling due too long of sampling */ + bbr_log_type_ltbw(bbr, cts, 3, 0, 0, 0, d_time); + return; + } + del_time = d_time; + bw = delivered; + bw *= (uint64_t)USECS_IN_SECOND; + bw /= del_time; + bbr_lt_bw_samp_done(bbr, bw, cts, d_time); +} + +/* + * Allocate a sendmap from our zone. + */ +static struct bbr_sendmap * +bbr_alloc(struct tcp_bbr *bbr) +{ + struct bbr_sendmap *rsm; + + BBR_STAT_INC(bbr_to_alloc); + rsm = uma_zalloc(bbr_zone, (M_NOWAIT | M_ZERO)); + if (rsm) { + bbr->r_ctl.rc_num_maps_alloced++; + return (rsm); + } + if (bbr->r_ctl.rc_free_cnt) { + BBR_STAT_INC(bbr_to_alloc_emerg); + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); + TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next); + bbr->r_ctl.rc_free_cnt--; + return (rsm); + } + BBR_STAT_INC(bbr_to_alloc_failed); + return (NULL); +} + +static struct bbr_sendmap * +bbr_alloc_full_limit(struct tcp_bbr *bbr) +{ + if ((bbr_tcp_map_entries_limit > 0) && + (bbr->r_ctl.rc_num_maps_alloced >= bbr_tcp_map_entries_limit)) { + BBR_STAT_INC(bbr_alloc_limited); + if (!bbr->alloc_limit_reported) { + bbr->alloc_limit_reported = 1; + BBR_STAT_INC(bbr_alloc_limited_conns); + } + return (NULL); + } + return (bbr_alloc(bbr)); +} + + +/* wrapper to allocate a sendmap entry, subject to a specific limit */ +static struct bbr_sendmap * +bbr_alloc_limit(struct tcp_bbr *bbr, uint8_t limit_type) +{ + struct bbr_sendmap *rsm; + + if (limit_type) { + /* currently there is only one limit type */ + if (bbr_tcp_map_split_limit > 0 && + bbr->r_ctl.rc_num_split_allocs >= bbr_tcp_map_split_limit) { + BBR_STAT_INC(bbr_split_limited); + if (!bbr->alloc_limit_reported) { + bbr->alloc_limit_reported = 1; + BBR_STAT_INC(bbr_alloc_limited_conns); + } + return (NULL); + } + } + + /* allocate and mark in the limit type, if set */ + rsm = bbr_alloc(bbr); + if (rsm != NULL && limit_type) { + rsm->r_limit_type = limit_type; + bbr->r_ctl.rc_num_split_allocs++; + } + return (rsm); +} + +static void +bbr_free(struct tcp_bbr *bbr, struct bbr_sendmap *rsm) +{ + if (rsm->r_limit_type) { + /* currently there is only one limit type */ + bbr->r_ctl.rc_num_split_allocs--; + } + if (rsm->r_is_smallmap) + bbr->r_ctl.rc_num_small_maps_alloced--; + if (bbr->r_ctl.rc_tlp_send == rsm) + bbr->r_ctl.rc_tlp_send = NULL; + if (bbr->r_ctl.rc_resend == rsm) { + bbr->r_ctl.rc_resend = NULL; + } + if (bbr->r_ctl.rc_next == rsm) + bbr->r_ctl.rc_next = NULL; + if (bbr->r_ctl.rc_sacklast == rsm) + bbr->r_ctl.rc_sacklast = NULL; + if (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) { + memset(rsm, 0, sizeof(struct bbr_sendmap)); + TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next); + rsm->r_limit_type = 0; + bbr->r_ctl.rc_free_cnt++; + return; + } + bbr->r_ctl.rc_num_maps_alloced--; + uma_zfree(bbr_zone, rsm); +} + +/* + * Returns the BDP. + */ +static uint64_t +bbr_get_bw_delay_prod(uint64_t rtt, uint64_t bw) { + /* + * Calculate the bytes in flight needed given the bw (in bytes per + * second) and the specifyed rtt in useconds. We need to put out the + * returned value per RTT to match that rate. Gain will normaly + * raise it up from there. + * + * This should not overflow as long as the bandwidth is below 1 + * TByte per second (bw < 10**12 = 2**40) and the rtt is smaller + * than 1000 seconds (rtt < 10**3 * 10**6 = 10**9 = 2**30). + */ + uint64_t usec_per_sec; + + usec_per_sec = USECS_IN_SECOND; + return ((rtt * bw) / usec_per_sec); +} + +/* + * Return the initial cwnd. + */ +static uint32_t +bbr_initial_cwnd(struct tcp_bbr *bbr, struct tcpcb *tp) +{ + uint32_t i_cwnd; + + if (bbr->rc_init_win) { + i_cwnd = bbr->rc_init_win * tp->t_maxseg; + } else if (V_tcp_initcwnd_segments) + i_cwnd = min((V_tcp_initcwnd_segments * tp->t_maxseg), + max(2 * tp->t_maxseg, 14600)); + else if (V_tcp_do_rfc3390) + i_cwnd = min(4 * tp->t_maxseg, + max(2 * tp->t_maxseg, 4380)); + else { + /* Per RFC5681 Section 3.1 */ + if (tp->t_maxseg > 2190) + i_cwnd = 2 * tp->t_maxseg; + else if (tp->t_maxseg > 1095) + i_cwnd = 3 * tp->t_maxseg; + else + i_cwnd = 4 * tp->t_maxseg; + } + return (i_cwnd); +} + +/* + * Given a specified gain, return the target + * cwnd based on that gain. + */ +static uint32_t +bbr_get_raw_target_cwnd(struct tcp_bbr *bbr, uint32_t gain, uint64_t bw) +{ + uint64_t bdp, rtt; + uint32_t cwnd; + + if ((get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) || + (bbr_get_full_bw(bbr) == 0)) { + /* No measurements yet */ + return (bbr_initial_cwnd(bbr, bbr->rc_tp)); + } + /* + * Get bytes per RTT needed (rttProp is normally in + * bbr_cwndtarget_rtt_touse) + */ + rtt = bbr_get_rtt(bbr, bbr_cwndtarget_rtt_touse); + /* Get the bdp from the two values */ + bdp = bbr_get_bw_delay_prod(rtt, bw); + /* Now apply the gain */ + cwnd = (uint32_t)(((bdp * ((uint64_t)gain)) + (uint64_t)(BBR_UNIT - 1)) / ((uint64_t)BBR_UNIT)); + + return (cwnd); +} + +static uint32_t +bbr_get_target_cwnd(struct tcp_bbr *bbr, uint64_t bw, uint32_t gain) +{ + uint32_t cwnd, mss; + + mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); + /* Get the base cwnd with gain rounded to a mss */ + cwnd = roundup(bbr_get_raw_target_cwnd(bbr, bw, gain), mss); + /* + * Add in N (2 default since we do not have a + * fq layer to trap packets in) quanta's per the I-D + * section 4.2.3.2 quanta adjust. + */ + cwnd += (bbr_quanta * bbr->r_ctl.rc_pace_max_segs); + if (bbr->rc_use_google) { + if((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && + (bbr_state_val(bbr) == BBR_SUB_GAIN)) { + /* + * The linux implementation adds + * an extra 2 x mss in gain cycle which + * is documented no-where except in the code. + * so we add more for Neal undocumented feature + */ + cwnd += 2 * mss; + } + if ((cwnd / mss) & 0x1) { + /* Round up for odd num mss */ + cwnd += mss; + } + } + /* Are we below the min cwnd? */ + if (cwnd < get_min_cwnd(bbr)) + return (get_min_cwnd(bbr)); + return (cwnd); +} + +static uint16_t +bbr_gain_adjust(struct tcp_bbr *bbr, uint16_t gain) +{ + if (gain < 1) + gain = 1; + return (gain); +} + +static uint32_t +bbr_get_header_oh(struct tcp_bbr *bbr) +{ + int seg_oh; + + seg_oh = 0; + if (bbr->r_ctl.rc_inc_tcp_oh) { + /* Do we include TCP overhead? */ + seg_oh = (bbr->rc_last_options + sizeof(struct tcphdr)); + } + if (bbr->r_ctl.rc_inc_ip_oh) { + /* Do we include IP overhead? */ +#ifdef INET6 + if (bbr->r_is_v6) + seg_oh += sizeof(struct ip6_hdr); + else +#endif +#ifdef INET + seg_oh += sizeof(struct ip); +#endif + } + if (bbr->r_ctl.rc_inc_enet_oh) { + /* Do we include the ethernet overhead? */ + seg_oh += sizeof(struct ether_header); + } + return(seg_oh); +} + + +static uint32_t +bbr_get_pacing_length(struct tcp_bbr *bbr, uint16_t gain, uint32_t useconds_time, uint64_t bw) +{ + uint64_t divor, res, tim; + + if (useconds_time == 0) + return (0); + gain = bbr_gain_adjust(bbr, gain); + divor = (uint64_t)USECS_IN_SECOND * (uint64_t)BBR_UNIT; + tim = useconds_time; + res = (tim * bw * gain) / divor; + if (res == 0) + res = 1; + return ((uint32_t)res); +} + +/* + * Given a gain and a length return the delay in useconds that + * should be used to evenly space out packets + * on the connection (based on the gain factor). + */ +static uint32_t +bbr_get_pacing_delay(struct tcp_bbr *bbr, uint16_t gain, int32_t len, uint32_t cts, int nolog) +{ + uint64_t bw, lentim, res; + uint32_t usecs, srtt, over = 0; + uint32_t seg_oh, num_segs, maxseg; + + if (len == 0) + return (0); + + maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; + num_segs = (len + maxseg - 1) / maxseg; + if (bbr->rc_use_google == 0) { + seg_oh = bbr_get_header_oh(bbr); + len += (num_segs * seg_oh); + } + gain = bbr_gain_adjust(bbr, gain); + bw = bbr_get_bw(bbr); + if (bbr->rc_use_google) { + uint64_t cbw; + + /* + * Reduce the b/w by the google discount + * factor 10 = 1%. + */ + cbw = bw * (uint64_t)(1000 - bbr->r_ctl.bbr_google_discount); + cbw /= (uint64_t)1000; + /* We don't apply a discount if it results in 0 */ + if (cbw > 0) + bw = cbw; + } + lentim = ((uint64_t)len * + (uint64_t)USECS_IN_SECOND * + (uint64_t)BBR_UNIT); + res = lentim / ((uint64_t)gain * bw); + if (res == 0) + res = 1; + usecs = (uint32_t)res; + srtt = bbr_get_rtt(bbr, BBR_SRTT); + if (bbr_hptsi_max_mul && bbr_hptsi_max_div && + (bbr->rc_use_google == 0) && + (usecs > ((srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div))) { + /* + * We cannot let the delay be more than 1/2 the srtt time. + * Otherwise we cannot pace out or send properly. + */ + over = usecs = (srtt * bbr_hptsi_max_mul) / bbr_hptsi_max_div; + BBR_STAT_INC(bbr_hpts_min_time); + } + if (!nolog) + bbr_log_pacing_delay_calc(bbr, gain, len, cts, usecs, bw, over, 1); + return (usecs); +} + +static void +bbr_ack_received(struct tcpcb *tp, struct tcp_bbr *bbr, struct tcphdr *th, uint32_t bytes_this_ack, + uint32_t sack_changed, uint32_t prev_acked, int32_t line, uint32_t losses) +{ + INP_WLOCK_ASSERT(tp->t_inpcb); + uint64_t bw; + uint32_t cwnd, target_cwnd, saved_bytes, maxseg; + int32_t meth; + +#ifdef NETFLIX_STATS + if ((tp->t_flags & TF_GPUTINPROG) && + SEQ_GEQ(th->th_ack, tp->gput_ack)) { + /* + * Strech acks and compressed acks will cause this to + * oscillate but we are doing it the same way as the main + * stack so it will be compariable (though possibly not + * ideal). + */ + int32_t cgput; + int64_t gput, time_stamp; + + gput = (int64_t) (th->th_ack - tp->gput_seq) * 8; + time_stamp = max(1, ((bbr->r_ctl.rc_rcvtime - tp->gput_ts) / 1000)); + cgput = gput / time_stamp; + stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT, + cgput); + if (tp->t_stats_gput_prev > 0) + stats_voi_update_abs_s32(tp->t_stats, + VOI_TCP_GPUT_ND, + ((gput - tp->t_stats_gput_prev) * 100) / + tp->t_stats_gput_prev); + tp->t_flags &= ~TF_GPUTINPROG; + tp->t_stats_gput_prev = cgput; + } +#endif + if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && + ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) { + /* We don't change anything in probe-rtt */ + return; + } + maxseg = tp->t_maxseg - bbr->rc_last_options; + saved_bytes = bytes_this_ack; + bytes_this_ack += sack_changed; + if (bytes_this_ack > prev_acked) { + bytes_this_ack -= prev_acked; + /* + * A byte ack'd gives us a full mss + * to be like linux i.e. they count packets. + */ + if ((bytes_this_ack < maxseg) && bbr->rc_use_google) + bytes_this_ack = maxseg; + } else { + /* Unlikely */ + bytes_this_ack = 0; + } + cwnd = tp->snd_cwnd; + bw = get_filter_value(&bbr->r_ctl.rc_delrate); + if (bw) + target_cwnd = bbr_get_target_cwnd(bbr, + bw, + (uint32_t)bbr->r_ctl.rc_bbr_cwnd_gain); + else + target_cwnd = bbr_initial_cwnd(bbr, bbr->rc_tp); + if (IN_RECOVERY(tp->t_flags) && + (bbr->bbr_prev_in_rec == 0)) { + /* + * We are entering recovery and + * thus packet conservation. + */ + bbr->pkt_conservation = 1; + bbr->r_ctl.rc_recovery_start = bbr->r_ctl.rc_rcvtime; + cwnd = ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + + bytes_this_ack; + } + if (IN_RECOVERY(tp->t_flags)) { + uint32_t flight; + + bbr->bbr_prev_in_rec = 1; + if (cwnd > losses) { + cwnd -= losses; + if (cwnd < maxseg) + cwnd = maxseg; + } else + cwnd = maxseg; + flight = ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + bbr_log_type_cwndupd(bbr, flight, 0, + losses, 10, 0, 0, line); + if (bbr->pkt_conservation) { + uint32_t time_in; + + if (TSTMP_GEQ(bbr->r_ctl.rc_rcvtime, bbr->r_ctl.rc_recovery_start)) + time_in = bbr->r_ctl.rc_rcvtime - bbr->r_ctl.rc_recovery_start; + else + time_in = 0; + + if (time_in >= bbr_get_rtt(bbr, BBR_RTT_PROP)) { + /* Clear packet conservation after an rttProp */ + bbr->pkt_conservation = 0; + } else { + if ((flight + bytes_this_ack) > cwnd) + cwnd = flight + bytes_this_ack; + if (cwnd < get_min_cwnd(bbr)) + cwnd = get_min_cwnd(bbr); + tp->snd_cwnd = cwnd; + bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, + prev_acked, 1, target_cwnd, th->th_ack, line); + return; + } + } + } else + bbr->bbr_prev_in_rec = 0; + if ((bbr->rc_use_google == 0) && bbr->r_ctl.restrict_growth) { + bbr->r_ctl.restrict_growth--; + if (bytes_this_ack > maxseg) + bytes_this_ack = maxseg; + } + if (bbr->rc_filled_pipe) { + /* + * Here we have exited startup and filled the pipe. We will + * thus allow the cwnd to shrink to the target. We hit here + * mostly. + */ + uint32_t s_cwnd; + + meth = 2; + s_cwnd = min((cwnd + bytes_this_ack), target_cwnd); + if (s_cwnd > cwnd) + cwnd = s_cwnd; + else if (bbr_cwnd_may_shrink || bbr->rc_use_google || bbr->rc_no_pacing) + cwnd = s_cwnd; + } else { + /* + * Here we are still in startup, we increase cwnd by what + * has been acked. + */ + if ((cwnd < target_cwnd) || + (bbr->rc_past_init_win == 0)) { + meth = 3; + cwnd += bytes_this_ack; + } else { + /* + * Method 4 means we are at target so no gain in + * startup and past the initial window. + */ + meth = 4; + } + } + tp->snd_cwnd = max(cwnd, get_min_cwnd(bbr)); + bbr_log_type_cwndupd(bbr, saved_bytes, sack_changed, prev_acked, meth, target_cwnd, th->th_ack, line); +} + +static void +tcp_bbr_partialack(struct tcpcb *tp) +{ + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + INP_WLOCK_ASSERT(tp->t_inpcb); + if (ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= + tp->snd_cwnd) { + bbr->r_wanted_output = 1; + } +} + +static void +bbr_post_recovery(struct tcpcb *tp) +{ + struct tcp_bbr *bbr; + uint32_t flight; + + INP_WLOCK_ASSERT(tp->t_inpcb); + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + /* + * Here we just exit recovery. + */ + EXIT_RECOVERY(tp->t_flags); + /* Lock in our b/w reduction for the specified number of pkt-epochs */ + bbr->r_recovery_bw = 0; + tp->snd_recover = tp->snd_una; + tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); + bbr->pkt_conservation = 0; + if (bbr->rc_use_google == 0) { + /* + * For non-google mode lets + * go ahead and make sure we clear + * the recovery state so if we + * bounce back in to recovery we + * will do PC. + */ + bbr->bbr_prev_in_rec = 0; + } + bbr_log_type_exit_rec(bbr); + if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { + tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent); + bbr_log_type_cwndupd(bbr, 0, 0, 0, 15, 0, 0, __LINE__); + } else { + /* For probe-rtt case lets fix up its saved_cwnd */ + if (bbr->r_ctl.rc_saved_cwnd < bbr->r_ctl.rc_cwnd_on_ent) { + bbr->r_ctl.rc_saved_cwnd = bbr->r_ctl.rc_cwnd_on_ent; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 16, 0, 0, __LINE__); + } + } + flight = ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + if ((bbr->rc_use_google == 0) && + bbr_do_red) { + uint64_t val, lr2use; + uint32_t maxseg, newcwnd, acks_inflight, ratio, cwnd; + uint32_t *cwnd_p; + + if (bbr_get_rtt(bbr, BBR_SRTT)) { + val = ((uint64_t)bbr_get_rtt(bbr, BBR_RTT_PROP) * (uint64_t)1000); + val /= bbr_get_rtt(bbr, BBR_SRTT); + ratio = (uint32_t)val; + } else + ratio = 1000; + + bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, + bbr->r_ctl.recovery_lr, 21, + ratio, + bbr->r_ctl.rc_red_cwnd_pe, + __LINE__); + if ((ratio < bbr_do_red) || (bbr_do_red == 0)) + goto done; + if (((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && + bbr_prtt_slam_cwnd) || + (bbr_sub_drain_slam_cwnd && + (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && + bbr->rc_hit_state_1 && + (bbr_state_val(bbr) == BBR_SUB_DRAIN)) || + ((bbr->rc_bbr_state == BBR_STATE_DRAIN) && + bbr_slam_cwnd_in_main_drain)) { + /* + * Here we must poke at the saved cwnd + * as well as the cwnd. + */ + cwnd = bbr->r_ctl.rc_saved_cwnd; + cwnd_p = &bbr->r_ctl.rc_saved_cwnd; + } else { + cwnd = tp->snd_cwnd; + cwnd_p = &tp->snd_cwnd; + } + maxseg = tp->t_maxseg - bbr->rc_last_options; + /* Add the overall lr with the recovery lr */ + if (bbr->r_ctl.rc_lost == 0) + lr2use = 0; + else if (bbr->r_ctl.rc_delivered == 0) + lr2use = 1000; + else { + lr2use = bbr->r_ctl.rc_lost * 1000; + lr2use /= bbr->r_ctl.rc_delivered; + } + lr2use += bbr->r_ctl.recovery_lr; + acks_inflight = (flight / (maxseg * 2)); + if (bbr_red_scale) { + lr2use *= bbr_get_rtt(bbr, BBR_SRTT); + lr2use /= bbr_red_scale; + if ((bbr_red_growth_restrict) && + ((bbr_get_rtt(bbr, BBR_SRTT)/bbr_red_scale) > 1)) + bbr->r_ctl.restrict_growth += acks_inflight; + } + if (lr2use) { + val = (uint64_t)cwnd * lr2use; + val /= 1000; + if (cwnd > val) + newcwnd = roundup((cwnd - val), maxseg); + else + newcwnd = maxseg; + } else { + val = (uint64_t)cwnd * (uint64_t)bbr_red_mul; + val /= (uint64_t)bbr_red_div; + newcwnd = roundup((uint32_t)val, maxseg); + } + /* with standard delayed acks how many acks can I expect? */ + if (bbr_drop_limit == 0) { + /* + * Anticpate how much we will + * raise the cwnd based on the acks. + */ + if ((newcwnd + (acks_inflight * maxseg)) < get_min_cwnd(bbr)) { + /* We do enforce the min (with the acks) */ + newcwnd = (get_min_cwnd(bbr) - acks_inflight); + } + } else { + /* + * A strict drop limit of N is is inplace + */ + if (newcwnd < (bbr_drop_limit * maxseg)) { + newcwnd = bbr_drop_limit * maxseg; + } + } + /* For the next N acks do we restrict the growth */ + *cwnd_p = newcwnd; + if (tp->snd_cwnd > newcwnd) + tp->snd_cwnd = newcwnd; + bbr_log_type_cwndupd(bbr, bbr_red_mul, bbr_red_div, val, 22, + (uint32_t)lr2use, + bbr_get_rtt(bbr, BBR_SRTT), __LINE__); + bbr->r_ctl.rc_red_cwnd_pe = bbr->r_ctl.rc_pkt_epoch; + } +done: + bbr->r_ctl.recovery_lr = 0; + if (flight <= tp->snd_cwnd) { + bbr->r_wanted_output = 1; + } + tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); +} + +static void +bbr_setup_red_bw(struct tcp_bbr *bbr, uint32_t cts) +{ + bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate); + /* Limit the drop in b/w to 1/2 our current filter. */ + if (bbr->r_ctl.red_bw > bbr->r_ctl.rc_bbr_cur_del_rate) + bbr->r_ctl.red_bw = bbr->r_ctl.rc_bbr_cur_del_rate; + if (bbr->r_ctl.red_bw < (get_filter_value(&bbr->r_ctl.rc_delrate) / 2)) + bbr->r_ctl.red_bw = get_filter_value(&bbr->r_ctl.rc_delrate) / 2; + tcp_bbr_tso_size_check(bbr, cts); +} + +static void +bbr_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type, struct bbr_sendmap *rsm) +{ + struct tcp_bbr *bbr; + + INP_WLOCK_ASSERT(tp->t_inpcb); + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + switch (type) { + case CC_NDUPACK: + if (!IN_RECOVERY(tp->t_flags)) { + tp->snd_recover = tp->snd_max; + /* Start a new epoch */ + bbr_set_pktepoch(bbr, bbr->r_ctl.rc_rcvtime, __LINE__); + if (bbr->rc_lt_is_sampling || bbr->rc_lt_use_bw) { + /* + * Move forward the lt epoch + * so it won't count the truncated + * epoch. + */ + bbr->r_ctl.rc_lt_epoch++; + } + if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { + /* + * Just like the policer detection code + * if we are in startup we must push + * forward the last startup epoch + * to hide the truncated PE. + */ + bbr->r_ctl.rc_bbr_last_startup_epoch++; + } + bbr->r_ctl.rc_cwnd_on_ent = tp->snd_cwnd; + ENTER_RECOVERY(tp->t_flags); + bbr->rc_tlp_rtx_out = 0; + bbr->r_ctl.recovery_lr = bbr->r_ctl.rc_pkt_epoch_loss_rate; + tcp_bbr_tso_size_check(bbr, bbr->r_ctl.rc_rcvtime); + if (bbr->rc_inp->inp_in_hpts && + ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK) == 0)) { + /* + * When we enter recovery, we need to restart + * any timers. This may mean we gain an agg + * early, which will be made up for at the last + * rxt out. + */ + bbr->rc_timer_first = 1; + bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); + } + /* + * Calculate a new cwnd based on to the current + * delivery rate with no gain. We get the bdp + * without gaining it up like we normally would and + * we use the last cur_del_rate. + */ + if ((bbr->rc_use_google == 0) && + (bbr->r_ctl.bbr_rttprobe_gain_val || + (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT))) { + tp->snd_cwnd = ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + + (tp->t_maxseg - bbr->rc_last_options); + if (tp->snd_cwnd < get_min_cwnd(bbr)) { + /* We always gate to min cwnd */ + tp->snd_cwnd = get_min_cwnd(bbr); + } + bbr_log_type_cwndupd(bbr, 0, 0, 0, 14, 0, 0, __LINE__); + } + bbr_log_type_enter_rec(bbr, rsm->r_start); + } + break; + case CC_RTO_ERR: + TCPSTAT_INC(tcps_sndrexmitbad); + /* RTO was unnecessary, so reset everything. */ + bbr_reset_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime); + if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { + tp->snd_cwnd = tp->snd_cwnd_prev; + tp->snd_ssthresh = tp->snd_ssthresh_prev; + tp->snd_recover = tp->snd_recover_prev; + tp->snd_cwnd = max(tp->snd_cwnd, bbr->r_ctl.rc_cwnd_on_ent); + bbr_log_type_cwndupd(bbr, 0, 0, 0, 13, 0, 0, __LINE__); + } + tp->t_badrxtwin = 0; + break; + } +} + +/* + * Indicate whether this ack should be delayed. We can delay the ack if + * following conditions are met: + * - There is no delayed ack timer in progress. + * - Our last ack wasn't a 0-sized window. We never want to delay + * the ack that opens up a 0-sized window. + * - LRO wasn't used for this segment. We make sure by checking that the + * segment size is not larger than the MSS. + * - Delayed acks are enabled or this is a half-synchronized T/TCP + * connection. + * - The data being acked is less than a full segment (a stretch ack + * of more than a segment we should ack. + * - nsegs is 1 (if its more than that we received more than 1 ack). + */ +#define DELAY_ACK(tp, bbr, nsegs) \ + (((tp->t_flags & TF_RXWIN0SENT) == 0) && \ + ((bbr->bbr_segs_rcvd + nsegs) < tp->t_delayed_ack) && \ + (tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN))) + +/* + * Return the lowest RSM in the map of + * packets still in flight that is not acked. + * This should normally find on the first one + * since we remove packets from the send + * map after they are marked ACKED. + */ +static struct bbr_sendmap * +bbr_find_lowest_rsm(struct tcp_bbr *bbr) +{ + struct bbr_sendmap *rsm; + + /* + * Walk the time-order transmitted list looking for an rsm that is + * not acked. This will be the one that was sent the longest time + * ago that is still outstanding. + */ + TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_tmap, r_tnext) { + if (rsm->r_flags & BBR_ACKED) { + continue; + } + goto finish; + } +finish: + return (rsm); +} + +static struct bbr_sendmap * +bbr_find_high_nonack(struct tcp_bbr *bbr, struct bbr_sendmap *rsm) +{ + struct bbr_sendmap *prsm; + + /* + * Walk the sequence order list backward until we hit and arrive at + * the highest seq not acked. In theory when this is called it + * should be the last segment (which it was not). + */ + prsm = rsm; + TAILQ_FOREACH_REVERSE_FROM(prsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { + if (prsm->r_flags & (BBR_ACKED | BBR_HAS_FIN)) { + continue; + } + return (prsm); + } + return (NULL); +} + +/* + * Returns to the caller the number of microseconds that + * the packet can be outstanding before we think we + * should have had an ack returned. + */ +static uint32_t +bbr_calc_thresh_rack(struct tcp_bbr *bbr, uint32_t srtt, uint32_t cts, struct bbr_sendmap *rsm) +{ + /* + * lro is the flag we use to determine if we have seen reordering. + * If it gets set we have seen reordering. The reorder logic either + * works in one of two ways: + * + * If reorder-fade is configured, then we track the last time we saw + * re-ordering occur. If we reach the point where enough time as + * passed we no longer consider reordering has occuring. + * + * Or if reorder-face is 0, then once we see reordering we consider + * the connection to alway be subject to reordering and just set lro + * to 1. + * + * In the end if lro is non-zero we add the extra time for + * reordering in. + */ + int32_t lro; + uint32_t thresh, t_rxtcur; + + if (srtt == 0) + srtt = 1; + if (bbr->r_ctl.rc_reorder_ts) { + if (bbr->r_ctl.rc_reorder_fade) { + if (SEQ_GEQ(cts, bbr->r_ctl.rc_reorder_ts)) { + lro = cts - bbr->r_ctl.rc_reorder_ts; + if (lro == 0) { + /* + * No time as passed since the last + * reorder, mark it as reordering. + */ + lro = 1; + } + } else { + /* Negative time? */ + lro = 0; + } + if (lro > bbr->r_ctl.rc_reorder_fade) { + /* Turn off reordering seen too */ + bbr->r_ctl.rc_reorder_ts = 0; + lro = 0; + } + } else { + /* Reodering does not fade */ + lro = 1; + } + } else { + lro = 0; + } + thresh = srtt + bbr->r_ctl.rc_pkt_delay; + if (lro) { + /* It must be set, if not you get 1/4 rtt */ + if (bbr->r_ctl.rc_reorder_shift) + thresh += (srtt >> bbr->r_ctl.rc_reorder_shift); + else + thresh += (srtt >> 2); + } else { + thresh += 1000; + } + /* We don't let the rack timeout be above a RTO */ + if ((bbr->rc_tp)->t_srtt == 0) + t_rxtcur = BBR_INITIAL_RTO; + else + t_rxtcur = TICKS_2_USEC(bbr->rc_tp->t_rxtcur); + if (thresh > t_rxtcur) { + thresh = t_rxtcur; + } + /* And we don't want it above the RTO max either */ + if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { + thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND); + } + bbr_log_thresh_choice(bbr, cts, thresh, lro, srtt, rsm, BBR_TO_FRM_RACK); + return (thresh); +} + +/* + * Return to the caller the amount of time in mico-seconds + * that should be used for the TLP timer from the last + * send time of this packet. + */ +static uint32_t +bbr_calc_thresh_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, + struct bbr_sendmap *rsm, uint32_t srtt, + uint32_t cts) +{ + uint32_t thresh, len, maxseg, t_rxtcur; + struct bbr_sendmap *prsm; + + if (srtt == 0) + srtt = 1; + if (bbr->rc_tlp_threshold) + thresh = srtt + (srtt / bbr->rc_tlp_threshold); + else + thresh = (srtt * 2); + maxseg = tp->t_maxseg - bbr->rc_last_options; + /* Get the previous sent packet, if any */ + len = rsm->r_end - rsm->r_start; + + /* 2.1 behavior */ + prsm = TAILQ_PREV(rsm, bbr_head, r_tnext); + if (prsm && (len <= maxseg)) { + /* + * Two packets outstanding, thresh should be (2*srtt) + + * possible inter-packet delay (if any). + */ + uint32_t inter_gap = 0; + int idx, nidx; + + idx = rsm->r_rtr_cnt - 1; + nidx = prsm->r_rtr_cnt - 1; + if (TSTMP_GEQ(rsm->r_tim_lastsent[nidx], prsm->r_tim_lastsent[idx])) { + /* Yes it was sent later (or at the same time) */ + inter_gap = rsm->r_tim_lastsent[idx] - prsm->r_tim_lastsent[nidx]; + } + thresh += inter_gap; + } else if (len <= maxseg) { + /* + * Possibly compensate for delayed-ack. + */ + uint32_t alt_thresh; + + alt_thresh = srtt + (srtt / 2) + bbr_delayed_ack_time; + if (alt_thresh > thresh) + thresh = alt_thresh; + } + /* Not above the current RTO */ + if (tp->t_srtt == 0) + t_rxtcur = BBR_INITIAL_RTO; + else + t_rxtcur = TICKS_2_USEC(tp->t_rxtcur); + + bbr_log_thresh_choice(bbr, cts, thresh, t_rxtcur, srtt, rsm, BBR_TO_FRM_TLP); + /* Not above an RTO */ + if (thresh > t_rxtcur) { + thresh = t_rxtcur; + } + /* Not above a RTO max */ + if (thresh > (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND)) { + thresh = (((uint32_t)bbr->rc_max_rto_sec) * USECS_IN_SECOND); + } + /* And now apply the user TLP min */ + if (thresh < bbr_tlp_min) { + thresh = bbr_tlp_min; + } + return (thresh); +} + +/* + * Return one of three RTTs to use (in microseconds). + */ +static __inline uint32_t +bbr_get_rtt(struct tcp_bbr *bbr, int32_t rtt_type) +{ + uint32_t f_rtt; + uint32_t srtt; + + f_rtt = get_filter_value_small(&bbr->r_ctl.rc_rttprop); + if (get_filter_value_small(&bbr->r_ctl.rc_rttprop) == 0xffffffff) { + /* We have no rtt at all */ + if (bbr->rc_tp->t_srtt == 0) + f_rtt = BBR_INITIAL_RTO; + else + f_rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); + /* + * Since we don't know how good the rtt is apply a + * delayed-ack min + */ + if (f_rtt < bbr_delayed_ack_time) { + f_rtt = bbr_delayed_ack_time; + } + } + /* Take the filter version or last measured pkt-rtt */ + if (rtt_type == BBR_RTT_PROP) { + srtt = f_rtt; + } else if (rtt_type == BBR_RTT_PKTRTT) { + if (bbr->r_ctl.rc_pkt_epoch_rtt) { + srtt = bbr->r_ctl.rc_pkt_epoch_rtt; + } else { + /* No pkt rtt yet */ + srtt = f_rtt; + } + } else if (rtt_type == BBR_RTT_RACK) { + srtt = bbr->r_ctl.rc_last_rtt; + /* We need to add in any internal delay for our timer */ + if (bbr->rc_ack_was_delayed) + srtt += bbr->r_ctl.rc_ack_hdwr_delay; + } else if (rtt_type == BBR_SRTT) { + srtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); + } else { + /* TSNH */ + srtt = f_rtt; +#ifdef BBR_INVARIANTS + panic("Unknown rtt request type %d", rtt_type); +#endif + } + return (srtt); +} + +static int +bbr_is_lost(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t cts) +{ + uint32_t thresh; + + + thresh = bbr_calc_thresh_rack(bbr, bbr_get_rtt(bbr, BBR_RTT_RACK), + cts, rsm); + if ((cts - rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)]) >= thresh) { + /* It is lost (past time) */ + return (1); + } + return (0); +} + +/* + * Return a sendmap if we need to retransmit something. + */ +static struct bbr_sendmap * +bbr_check_recovery_mode(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + /* + * Check to see that we don't need to fall into recovery. We will + * need to do so if our oldest transmit is past the time we should + * have had an ack. + */ + + struct bbr_sendmap *rsm; + int32_t idx; + + if (TAILQ_EMPTY(&bbr->r_ctl.rc_map)) { + /* Nothing outstanding that we know of */ + return (NULL); + } + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); + if (rsm == NULL) { + /* Nothing in the transmit map */ + return (NULL); + } + if (tp->t_flags & TF_SENTFIN) { + /* Fin restricted, don't find anything once a fin is sent */ + return (NULL); + } + if (rsm->r_flags & BBR_ACKED) { + /* + * Ok the first one is acked (this really should not happen + * since we remove the from the tmap once they are acked) + */ + rsm = bbr_find_lowest_rsm(bbr); + if (rsm == NULL) + return (NULL); + } + idx = rsm->r_rtr_cnt - 1; + if (SEQ_LEQ(cts, rsm->r_tim_lastsent[idx])) { + /* Send timestamp is the same or less? can't be ready */ + return (NULL); + } + /* Get our RTT time */ + if (bbr_is_lost(bbr, rsm, cts) && + ((rsm->r_dupack >= DUP_ACK_THRESHOLD) || + (rsm->r_flags & BBR_SACK_PASSED))) { + if ((rsm->r_flags & BBR_MARKED_LOST) == 0) { + rsm->r_flags |= BBR_MARKED_LOST; + bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; + bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; + } + bbr_cong_signal(tp, NULL, CC_NDUPACK, rsm); +#ifdef BBR_INVARIANTS + if ((rsm->r_end - rsm->r_start) == 0) + panic("tp:%p bbr:%p rsm:%p length is 0?", tp, bbr, rsm); +#endif + return (rsm); + } + return (NULL); +} + +/* + * RACK Timer, here we simply do logging and house keeping. + * the normal bbr_output_wtime() function will call the + * appropriate thing to check if we need to do a RACK retransmit. + * We return 1, saying don't proceed with bbr_output_wtime only + * when all timers have been stopped (destroyed PCB?). + */ +static int +bbr_timeout_rack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + /* + * This timer simply provides an internal trigger to send out data. + * The check_recovery_mode call will see if there are needed + * retransmissions, if so we will enter fast-recovery. The output + * call may or may not do the same thing depending on sysctl + * settings. + */ + uint32_t lost; + + if (bbr->rc_all_timers_stopped) { + return (1); + } + if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { + /* Its not time yet */ + return (0); + } + BBR_STAT_INC(bbr_to_tot); + lost = bbr->r_ctl.rc_lost; + if (bbr->r_state && (bbr->r_state != tp->t_state)) + bbr_set_state(tp, bbr, 0); + bbr_log_to_event(bbr, cts, BBR_TO_FRM_RACK); + if (bbr->r_ctl.rc_resend == NULL) { + /* Lets do the check here */ + bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); + } + if (bbr_policer_call_from_rack_to) + bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost)); + bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RACK; + return (0); +} + +static __inline void +bbr_clone_rsm(struct tcp_bbr *bbr, struct bbr_sendmap *nrsm, struct bbr_sendmap *rsm, uint32_t start) +{ + int idx; + + nrsm->r_start = start; + nrsm->r_end = rsm->r_end; + nrsm->r_rtr_cnt = rsm->r_rtr_cnt; + nrsm->r_flags = rsm->r_flags; + /* We don't transfer forward the SYN flag */ + nrsm->r_flags &= ~BBR_HAS_SYN; + /* We move forward the FIN flag, not that this should happen */ + rsm->r_flags &= ~BBR_HAS_FIN; + nrsm->r_dupack = rsm->r_dupack; + nrsm->r_rtr_bytes = 0; + nrsm->r_is_gain = rsm->r_is_gain; + nrsm->r_is_drain = rsm->r_is_drain; + nrsm->r_delivered = rsm->r_delivered; + nrsm->r_ts_valid = rsm->r_ts_valid; + nrsm->r_del_ack_ts = rsm->r_del_ack_ts; + nrsm->r_del_time = rsm->r_del_time; + nrsm->r_app_limited = rsm->r_app_limited; + nrsm->r_first_sent_time = rsm->r_first_sent_time; + nrsm->r_flight_at_send = rsm->r_flight_at_send; + /* We split a piece the lower section looses any just_ret flag. */ + nrsm->r_bbr_state = rsm->r_bbr_state; + for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { + nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; + } + rsm->r_end = nrsm->r_start; + idx = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), bbr->r_ctl.rc_pace_max_segs); + idx /= 8; + /* Check if we got too small */ + if ((rsm->r_is_smallmap == 0) && + ((rsm->r_end - rsm->r_start) <= idx)) { + bbr->r_ctl.rc_num_small_maps_alloced++; + rsm->r_is_smallmap = 1; + } + /* Check the new one as well */ + if ((nrsm->r_end - nrsm->r_start) <= idx) { + bbr->r_ctl.rc_num_small_maps_alloced++; + nrsm->r_is_smallmap = 1; + } +} + +static int +bbr_sack_mergable(struct bbr_sendmap *at, + uint32_t start, uint32_t end) +{ + /* + * Given a sack block defined by + * start and end, and a current postion + * at. Return 1 if either side of at + * would show that the block is mergable + * to that side. A block to be mergable + * must have overlap with the start/end + * and be in the SACK'd state. + */ + struct bbr_sendmap *l_rsm; + struct bbr_sendmap *r_rsm; + + /* first get the either side blocks */ + l_rsm = TAILQ_PREV(at, bbr_head, r_next); + r_rsm = TAILQ_NEXT(at, r_next); + if (l_rsm && (l_rsm->r_flags & BBR_ACKED)) { + /* Potentially mergeable */ + if ((l_rsm->r_end == start) || + (SEQ_LT(start, l_rsm->r_end) && + SEQ_GT(end, l_rsm->r_end))) { + /* + * map blk |------| + * sack blk |------| + * <or> + * map blk |------| + * sack blk |------| + */ + return (1); + } + } + if (r_rsm && (r_rsm->r_flags & BBR_ACKED)) { + /* Potentially mergeable */ + if ((r_rsm->r_start == end) || + (SEQ_LT(start, r_rsm->r_start) && + SEQ_GT(end, r_rsm->r_start))) { + /* + * map blk |---------| + * sack blk |----| + * <or> + * map blk |---------| + * sack blk |-------| + */ + return (1); + } + } + return (0); +} + +static struct bbr_sendmap * +bbr_merge_rsm(struct tcp_bbr *bbr, + struct bbr_sendmap *l_rsm, + struct bbr_sendmap *r_rsm) +{ + /* + * We are merging two ack'd RSM's, + * the l_rsm is on the left (lower seq + * values) and the r_rsm is on the right + * (higher seq value). The simplest way + * to merge these is to move the right + * one into the left. I don't think there + * is any reason we need to try to find + * the oldest (or last oldest retransmitted). + */ + l_rsm->r_end = r_rsm->r_end; + if (l_rsm->r_dupack < r_rsm->r_dupack) + l_rsm->r_dupack = r_rsm->r_dupack; + if (r_rsm->r_rtr_bytes) + l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes; + if (r_rsm->r_in_tmap) { + /* This really should not happen */ + TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, r_rsm, r_tnext); + } + if (r_rsm->r_app_limited) + l_rsm->r_app_limited = r_rsm->r_app_limited; + /* Now the flags */ + if (r_rsm->r_flags & BBR_HAS_FIN) + l_rsm->r_flags |= BBR_HAS_FIN; + if (r_rsm->r_flags & BBR_TLP) + l_rsm->r_flags |= BBR_TLP; + if (r_rsm->r_flags & BBR_RWND_COLLAPSED) + l_rsm->r_flags |= BBR_RWND_COLLAPSED; + if (r_rsm->r_flags & BBR_MARKED_LOST) { + /* This really should not happen */ + bbr->r_ctl.rc_lost_bytes -= r_rsm->r_end - r_rsm->r_start; + } + TAILQ_REMOVE(&bbr->r_ctl.rc_map, r_rsm, r_next); + if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) { + /* Transfer the split limit to the map we free */ + r_rsm->r_limit_type = l_rsm->r_limit_type; + l_rsm->r_limit_type = 0; + } + bbr_free(bbr, r_rsm); + return(l_rsm); +} + +/* + * TLP Timer, here we simply setup what segment we want to + * have the TLP expire on, the normal bbr_output_wtime() will then + * send it out. + * + * We return 1, saying don't proceed with bbr_output_wtime only + * when all timers have been stopped (destroyed PCB?). + */ +static int +bbr_timeout_tlp(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + /* + * Tail Loss Probe. + */ + struct bbr_sendmap *rsm = NULL; + struct socket *so; + uint32_t amm; + uint32_t out, avail; + uint32_t maxseg; + int collapsed_win = 0; + + if (bbr->rc_all_timers_stopped) { + return (1); + } + if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { + /* Its not time yet */ + return (0); + } + if (bbr_progress_timeout_check(bbr)) { + tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); + return (1); + } + /* Did we somehow get into persists? */ + if (bbr->rc_in_persist) { + return (0); + } + if (bbr->r_state && (bbr->r_state != tp->t_state)) + bbr_set_state(tp, bbr, 0); + BBR_STAT_INC(bbr_tlp_tot); + maxseg = tp->t_maxseg - bbr->rc_last_options; +#ifdef KERN_TLS + if (bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) { + /* + * For hardware TLS we do *not* want to send + * new data. + */ + goto need_retran; + } +#endif + /* + * A TLP timer has expired. We have been idle for 2 rtts. So we now + * need to figure out how to force a full MSS segment out. + */ + so = tp->t_inpcb->inp_socket; + avail = sbavail(&so->so_snd); + out = ctf_outstanding(tp); + if (out > tp->snd_wnd) { + /* special case, we need a retransmission */ + collapsed_win = 1; + goto need_retran; + } + if (avail > out) { + /* New data is available */ + amm = avail - out; + if (amm > maxseg) { + amm = maxseg; + } else if ((amm < maxseg) && ((tp->t_flags & TF_NODELAY) == 0)) { + /* not enough to fill a MTU and no-delay is off */ + goto need_retran; + } + /* Set the send-new override */ + if ((out + amm) <= tp->snd_wnd) { + bbr->rc_tlp_new_data = 1; + } else { + goto need_retran; + } + bbr->r_ctl.rc_tlp_seg_send_cnt = 0; + bbr->r_ctl.rc_last_tlp_seq = tp->snd_max; + bbr->r_ctl.rc_tlp_send = NULL; + /* cap any slots */ + BBR_STAT_INC(bbr_tlp_newdata); + goto send; + } +need_retran: + /* + * Ok we need to arrange the last un-acked segment to be re-sent, or + * optionally the first un-acked segment. + */ + if (collapsed_win == 0) { + rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); + if (rsm && (BBR_ACKED | BBR_HAS_FIN)) { + rsm = bbr_find_high_nonack(bbr, rsm); + } + if (rsm == NULL) { + goto restore; + } + } else { + /* + * We must find the last segment + * that was acceptable by the client. + */ + TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { + if ((rsm->r_flags & BBR_RWND_COLLAPSED) == 0) { + /* Found one */ + break; + } + } + if (rsm == NULL) { + /* None? if so send the first */ + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + if (rsm == NULL) + goto restore; + } + } + if ((rsm->r_end - rsm->r_start) > maxseg) { + /* + * We need to split this the last segment in two. + */ + struct bbr_sendmap *nrsm; + + nrsm = bbr_alloc_full_limit(bbr); + if (nrsm == NULL) { + /* + * We can't get memory to split, we can either just + * not split it. Or retransmit the whole piece, lets + * do the large send (BTLP :-) ). + */ + goto go_for_it; + } + bbr_clone_rsm(bbr, nrsm, rsm, (rsm->r_end - maxseg)); + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + rsm->r_flags &= (~BBR_HAS_FIN); + rsm = nrsm; + } +go_for_it: + bbr->r_ctl.rc_tlp_send = rsm; + bbr->rc_tlp_rtx_out = 1; + if (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) { + bbr->r_ctl.rc_tlp_seg_send_cnt++; + tp->t_rxtshift++; + } else { + bbr->r_ctl.rc_last_tlp_seq = rsm->r_start; + bbr->r_ctl.rc_tlp_seg_send_cnt = 1; + } +send: + if (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend) { + /* + * Can't [re]/transmit a segment we have retranmitted the + * max times. We need the retransmit timer to take over. + */ +restore: + bbr->rc_tlp_new_data = 0; + bbr->r_ctl.rc_tlp_send = NULL; + if (rsm) + rsm->r_flags &= ~BBR_TLP; + BBR_STAT_INC(bbr_tlp_retran_fail); + return (0); + } else if (rsm) { + rsm->r_flags |= BBR_TLP; + } + if (rsm && (rsm->r_start == bbr->r_ctl.rc_last_tlp_seq) && + (bbr->r_ctl.rc_tlp_seg_send_cnt > bbr_tlp_max_resend)) { + /* + * We have retransmitted to many times for TLP. Switch to + * the regular RTO timer + */ + goto restore; + } + bbr_log_to_event(bbr, cts, BBR_TO_FRM_TLP); + bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP; + return (0); +} + +/* + * Delayed ack Timer, here we simply need to setup the + * ACK_NOW flag and remove the DELACK flag. From there + * the output routine will send the ack out. + * + * We only return 1, saying don't proceed, if all timers + * are stopped (destroyed PCB?). + */ +static int +bbr_timeout_delack(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + if (bbr->rc_all_timers_stopped) { + return (1); + } + bbr_log_to_event(bbr, cts, BBR_TO_FRM_DELACK); + tp->t_flags &= ~TF_DELACK; + tp->t_flags |= TF_ACKNOW; + TCPSTAT_INC(tcps_delack); + bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_DELACK; + return (0); +} + +/* + * Persists timer, here we simply need to setup the + * FORCE-DATA flag the output routine will send + * the one byte send. + * + * We only return 1, saying don't proceed, if all timers + * are stopped (destroyed PCB?). + */ +static int +bbr_timeout_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + struct tcptemp *t_template; + int32_t retval = 1; + + if (bbr->rc_all_timers_stopped) { + return (1); + } + if (bbr->rc_in_persist == 0) + return (0); + KASSERT(tp->t_inpcb != NULL, + ("%s: tp %p tp->t_inpcb == NULL", __func__, tp)); + /* + * Persistence timer into zero window. Force a byte to be output, if + * possible. + */ + bbr_log_to_event(bbr, cts, BBR_TO_FRM_PERSIST); + bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_PERSIT; + TCPSTAT_INC(tcps_persisttimeo); + /* + * Have we exceeded the user specified progress time? + */ + if (bbr_progress_timeout_check(bbr)) { + tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); + goto out; + } + /* + * Hack: if the peer is dead/unreachable, we do not time out if the + * window is closed. After a full backoff, drop the connection if + * the idle time (no responses to probes) reaches the maximum + * backoff that we would use if retransmitting. + */ + if (tp->t_rxtshift == TCP_MAXRXTSHIFT && + (ticks - tp->t_rcvtime >= tcp_maxpersistidle || + ticks - tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) { + TCPSTAT_INC(tcps_persistdrop); + tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); + goto out; + } + if ((sbavail(&bbr->rc_inp->inp_socket->so_snd) == 0) && + tp->snd_una == tp->snd_max) { + bbr_exit_persist(tp, bbr, cts, __LINE__); + retval = 0; + goto out; + } + /* + * If the user has closed the socket then drop a persisting + * connection after a much reduced timeout. + */ + if (tp->t_state > TCPS_CLOSE_WAIT && + (ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) { + TCPSTAT_INC(tcps_persistdrop); + tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); + goto out; + } + t_template = tcpip_maketemplate(bbr->rc_inp); + if (t_template) { + tcp_respond(tp, t_template->tt_ipgen, + &t_template->tt_t, (struct mbuf *)NULL, + tp->rcv_nxt, tp->snd_una - 1, 0); + /* This sends an ack */ + if (tp->t_flags & TF_DELACK) + tp->t_flags &= ~TF_DELACK; + free(t_template, M_TEMP); + } + if (tp->t_rxtshift < TCP_MAXRXTSHIFT) + tp->t_rxtshift++; + bbr_start_hpts_timer(bbr, tp, cts, 3, 0, 0); +out: + return (retval); +} + +/* + * If a keepalive goes off, we had no other timers + * happening. We always return 1 here since this + * routine either drops the connection or sends + * out a segment with respond. + */ +static int +bbr_timeout_keepalive(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + struct tcptemp *t_template; + struct inpcb *inp; + + if (bbr->rc_all_timers_stopped) { + return (1); + } + bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP; + inp = tp->t_inpcb; + bbr_log_to_event(bbr, cts, BBR_TO_FRM_KEEP); + /* + * Keep-alive timer went off; send something or drop connection if + * idle for too long. + */ + TCPSTAT_INC(tcps_keeptimeo); + if (tp->t_state < TCPS_ESTABLISHED) + goto dropit; + if ((tcp_always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) && + tp->t_state <= TCPS_CLOSING) { + if (ticks - tp->t_rcvtime >= TP_KEEPIDLE(tp) + TP_MAXIDLE(tp)) + goto dropit; + /* + * Send a packet designed to force a response if the peer is + * up and reachable: either an ACK if the connection is + * still alive, or an RST if the peer has closed the + * connection due to timeout or reboot. Using sequence + * number tp->snd_una-1 causes the transmitted zero-length + * segment to lie outside the receive window; by the + * protocol spec, this requires the correspondent TCP to + * respond. + */ + TCPSTAT_INC(tcps_keepprobe); + t_template = tcpip_maketemplate(inp); + if (t_template) { + tcp_respond(tp, t_template->tt_ipgen, + &t_template->tt_t, (struct mbuf *)NULL, + tp->rcv_nxt, tp->snd_una - 1, 0); + free(t_template, M_TEMP); + } + } + bbr_start_hpts_timer(bbr, tp, cts, 4, 0, 0); + return (1); +dropit: + TCPSTAT_INC(tcps_keepdrops); + tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); + return (1); +} + +/* + * Retransmit helper function, clear up all the ack + * flags and take care of important book keeping. + */ +static void +bbr_remxt_tmr(struct tcpcb *tp) +{ + /* + * The retransmit timer went off, all sack'd blocks must be + * un-acked. + */ + struct bbr_sendmap *rsm, *trsm = NULL; + struct tcp_bbr *bbr; + uint32_t cts, lost; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + cts = tcp_get_usecs(&bbr->rc_tv); + lost = bbr->r_ctl.rc_lost; + if (bbr->r_state && (bbr->r_state != tp->t_state)) + bbr_set_state(tp, bbr, 0); + + TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { + if (rsm->r_flags & BBR_ACKED) { + uint32_t old_flags; + + rsm->r_dupack = 0; + if (rsm->r_in_tmap == 0) { + /* We must re-add it back to the tlist */ + if (trsm == NULL) { + TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + } else { + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, trsm, rsm, r_tnext); + } + rsm->r_in_tmap = 1; + } + old_flags = rsm->r_flags; + rsm->r_flags |= BBR_RXT_CLEARED; + rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS); + bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__); + } else { + if ((rsm->r_flags & BBR_MARKED_LOST) == 0) { + bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; + bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; + } + if (bbr_marks_rxt_sack_passed) { + /* + * With this option, we will rack out + * in 1ms increments the rest of the packets. + */ + rsm->r_flags |= BBR_SACK_PASSED | BBR_MARKED_LOST; + rsm->r_flags &= ~BBR_WAS_SACKPASS; + } else { + /* + * With this option we only mark them lost + * and remove all sack'd markings. We will run + * another RXT or a TLP. This will cause + * us to eventually send more based on what + * ack's come in. + */ + rsm->r_flags |= BBR_MARKED_LOST; + rsm->r_flags &= ~BBR_WAS_SACKPASS; + rsm->r_flags &= ~BBR_SACK_PASSED; + } + } + trsm = rsm; + } + bbr->r_ctl.rc_resend = TAILQ_FIRST(&bbr->r_ctl.rc_map); + /* Clear the count (we just un-acked them) */ + bbr_log_to_event(bbr, cts, BBR_TO_FRM_TMR); + bbr->rc_tlp_new_data = 0; + bbr->r_ctl.rc_tlp_seg_send_cnt = 0; + /* zap the behindness on a rxt */ + bbr->r_ctl.rc_hptsi_agg_delay = 0; + bbr->r_agg_early_set = 0; + bbr->r_ctl.rc_agg_early = 0; + bbr->rc_tlp_rtx_out = 0; + bbr->r_ctl.rc_sacked = 0; + bbr->r_ctl.rc_sacklast = NULL; + bbr->r_timer_override = 1; + bbr_lt_bw_sampling(bbr, cts, (bbr->r_ctl.rc_lost > lost)); +} + +/* + * Re-transmit timeout! If we drop the PCB we will return 1, otherwise + * we will setup to retransmit the lowest seq number outstanding. + */ +static int +bbr_timeout_rxt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + int32_t rexmt; + int32_t retval = 0; + + bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_RXT; + if (bbr->rc_all_timers_stopped) { + return (1); + } + if (TCPS_HAVEESTABLISHED(tp->t_state) && + (tp->snd_una == tp->snd_max)) { + /* Nothing outstanding .. nothing to do */ + return (0); + } + /* + * Retransmission timer went off. Message has not been acked within + * retransmit interval. Back off to a longer retransmit interval + * and retransmit one segment. + */ + if (bbr_progress_timeout_check(bbr)) { + retval = 1; + tcp_set_inp_to_drop(bbr->rc_inp, ETIMEDOUT); + goto out; + } + bbr_remxt_tmr(tp); + if ((bbr->r_ctl.rc_resend == NULL) || + ((bbr->r_ctl.rc_resend->r_flags & BBR_RWND_COLLAPSED) == 0)) { + /* + * If the rwnd collapsed on + * the one we are retransmitting + * it does not count against the + * rxt count. + */ + tp->t_rxtshift++; + } + if (tp->t_rxtshift > TCP_MAXRXTSHIFT) { + tp->t_rxtshift = TCP_MAXRXTSHIFT; + TCPSTAT_INC(tcps_timeoutdrop); + retval = 1; + tcp_set_inp_to_drop(bbr->rc_inp, + (tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT)); + goto out; + } + if (tp->t_state == TCPS_SYN_SENT) { + /* + * If the SYN was retransmitted, indicate CWND to be limited + * to 1 segment in cc_conn_init(). + */ + tp->snd_cwnd = 1; + } else if (tp->t_rxtshift == 1) { + /* + * first retransmit; record ssthresh and cwnd so they can be + * recovered if this turns out to be a "bad" retransmit. A + * retransmit is considered "bad" if an ACK for this segment + * is received within RTT/2 interval; the assumption here is + * that the ACK was already in flight. See "On Estimating + * End-to-End Network Path Properties" by Allman and Paxson + * for more details. + */ + tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; + if (!IN_RECOVERY(tp->t_flags)) { + tp->snd_cwnd_prev = tp->snd_cwnd; + tp->snd_ssthresh_prev = tp->snd_ssthresh; + tp->snd_recover_prev = tp->snd_recover; + tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1)); + tp->t_flags |= TF_PREVVALID; + } else { + tp->t_flags &= ~TF_PREVVALID; + } + tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; + } else { + tp->snd_cwnd = tp->t_maxseg - bbr->rc_last_options; + tp->t_flags &= ~TF_PREVVALID; + } + TCPSTAT_INC(tcps_rexmttimeo); + if ((tp->t_state == TCPS_SYN_SENT) || + (tp->t_state == TCPS_SYN_RECEIVED)) + rexmt = USEC_2_TICKS(BBR_INITIAL_RTO) * tcp_backoff[tp->t_rxtshift]; + else + rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift]; + TCPT_RANGESET(tp->t_rxtcur, rexmt, + MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), + MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000)); + /* + * We enter the path for PLMTUD if connection is established or, if + * connection is FIN_WAIT_1 status, reason for the last is that if + * amount of data we send is very small, we could send it in couple + * of packets and process straight to FIN. In that case we won't + * catch ESTABLISHED state. + */ + if (V_tcp_pmtud_blackhole_detect && (((tp->t_state == TCPS_ESTABLISHED)) + || (tp->t_state == TCPS_FIN_WAIT_1))) { +#ifdef INET6 + int32_t isipv6; +#endif + + /* + * Idea here is that at each stage of mtu probe (usually, + * 1448 -> 1188 -> 524) should be given 2 chances to recover + * before further clamping down. 'tp->t_rxtshift % 2 == 0' + * should take care of that. + */ + if (((tp->t_flags2 & (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) == + (TF2_PLPMTU_PMTUD | TF2_PLPMTU_MAXSEGSNT)) && + (tp->t_rxtshift >= 2 && tp->t_rxtshift < 6 && + tp->t_rxtshift % 2 == 0)) { + /* + * Enter Path MTU Black-hole Detection mechanism: - + * Disable Path MTU Discovery (IP "DF" bit). - + * Reduce MTU to lower value than what we negotiated + * with peer. + */ + if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) { + /* + * Record that we may have found a black + * hole. + */ + tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE; + /* Keep track of previous MSS. */ + tp->t_pmtud_saved_maxseg = tp->t_maxseg; + } + /* + * Reduce the MSS to blackhole value or to the + * default in an attempt to retransmit. + */ +#ifdef INET6 + isipv6 = bbr->r_is_v6; + if (isipv6 && + tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss) { + /* Use the sysctl tuneable blackhole MSS. */ + tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss; + TCPSTAT_INC(tcps_pmtud_blackhole_activated); + } else if (isipv6) { + /* Use the default MSS. */ + tp->t_maxseg = V_tcp_v6mssdflt; + /* + * Disable Path MTU Discovery when we switch + * to minmss. + */ + tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; + TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss); + } +#endif +#if defined(INET6) && defined(INET) + else +#endif +#ifdef INET + if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss) { + /* Use the sysctl tuneable blackhole MSS. */ + tp->t_maxseg = V_tcp_pmtud_blackhole_mss; + TCPSTAT_INC(tcps_pmtud_blackhole_activated); + } else { + /* Use the default MSS. */ + tp->t_maxseg = V_tcp_mssdflt; + /* + * Disable Path MTU Discovery when we switch + * to minmss. + */ + tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; + TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss); + } +#endif + } else { + /* + * If further retransmissions are still unsuccessful + * with a lowered MTU, maybe this isn't a blackhole + * and we restore the previous MSS and blackhole + * detection flags. The limit '6' is determined by + * giving each probe stage (1448, 1188, 524) 2 + * chances to recover. + */ + if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) && + (tp->t_rxtshift >= 6)) { + tp->t_flags2 |= TF2_PLPMTU_PMTUD; + tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE; + tp->t_maxseg = tp->t_pmtud_saved_maxseg; + TCPSTAT_INC(tcps_pmtud_blackhole_failed); + } + } + } + /* + * Disable RFC1323 and SACK if we haven't got any response to our + * third SYN to work-around some broken terminal servers (most of + * which have hopefully been retired) that have bad VJ header + * compression code which trashes TCP segments containing + * unknown-to-them TCP options. + */ + if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) && + (tp->t_rxtshift == 3)) + tp->t_flags &= ~(TF_REQ_SCALE | TF_REQ_TSTMP | TF_SACK_PERMIT); + /* + * If we backed off this far, our srtt estimate is probably bogus. + * Clobber it so we'll take the next rtt measurement as our srtt; + * move the current srtt into rttvar to keep the current retransmit + * times until then. + */ + if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) { +#ifdef INET6 + if (bbr->r_is_v6) + in6_losing(tp->t_inpcb); + else +#endif + in_losing(tp->t_inpcb); + tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT); + tp->t_srtt = 0; + } + sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); + tp->snd_recover = tp->snd_max; + tp->t_flags |= TF_ACKNOW; + tp->t_rtttime = 0; +out: + return (retval); +} + +static int +bbr_process_timers(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, uint8_t hpts_calling) +{ + int32_t ret = 0; + int32_t timers = (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK); + + if (timers == 0) { + return (0); + } + if (tp->t_state == TCPS_LISTEN) { + /* no timers on listen sockets */ + if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) + return (0); + return (1); + } + if (TSTMP_LT(cts, bbr->r_ctl.rc_timer_exp)) { + uint32_t left; + + if (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) { + ret = -1; + bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling); + return (0); + } + if (hpts_calling == 0) { + ret = -2; + bbr_log_to_processing(bbr, cts, ret, 0, hpts_calling); + return (0); + } + /* + * Ok our timer went off early and we are not paced false + * alarm, go back to sleep. + */ + left = bbr->r_ctl.rc_timer_exp - cts; + ret = -3; + bbr_log_to_processing(bbr, cts, ret, left, hpts_calling); + tcp_hpts_insert(tp->t_inpcb, HPTS_USEC_TO_SLOTS(left)); + return (1); + } + bbr->rc_tmr_stopped = 0; + bbr->r_ctl.rc_hpts_flags &= ~PACE_TMR_MASK; + if (timers & PACE_TMR_DELACK) { + ret = bbr_timeout_delack(tp, bbr, cts); + } else if (timers & PACE_TMR_PERSIT) { + ret = bbr_timeout_persist(tp, bbr, cts); + } else if (timers & PACE_TMR_RACK) { + bbr->r_ctl.rc_tlp_rxt_last_time = cts; + ret = bbr_timeout_rack(tp, bbr, cts); + } else if (timers & PACE_TMR_TLP) { + bbr->r_ctl.rc_tlp_rxt_last_time = cts; + ret = bbr_timeout_tlp(tp, bbr, cts); + } else if (timers & PACE_TMR_RXT) { + bbr->r_ctl.rc_tlp_rxt_last_time = cts; + ret = bbr_timeout_rxt(tp, bbr, cts); + } else if (timers & PACE_TMR_KEEP) { + ret = bbr_timeout_keepalive(tp, bbr, cts); + } + bbr_log_to_processing(bbr, cts, ret, timers, hpts_calling); + return (ret); +} + +static void +bbr_timer_cancel(struct tcp_bbr *bbr, int32_t line, uint32_t cts) +{ + if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) { + uint8_t hpts_removed = 0; + + if (bbr->rc_inp->inp_in_hpts && + (bbr->rc_timer_first == 1)) { + /* + * If we are canceling timer's when we have the + * timer ahead of the output being paced. We also + * must remove ourselves from the hpts. + */ + hpts_removed = 1; + tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); + if (bbr->r_ctl.rc_last_delay_val) { + /* Update the last hptsi delay too */ + uint32_t time_since_send; + + if (TSTMP_GT(cts, bbr->rc_pacer_started)) + time_since_send = cts - bbr->rc_pacer_started; + else + time_since_send = 0; + if (bbr->r_ctl.rc_last_delay_val > time_since_send) { + /* Cut down our slot time */ + bbr->r_ctl.rc_last_delay_val -= time_since_send; + } else { + bbr->r_ctl.rc_last_delay_val = 0; + } + bbr->rc_pacer_started = cts; + } + } + bbr->rc_timer_first = 0; + bbr_log_to_cancel(bbr, line, cts, hpts_removed); + bbr->rc_tmr_stopped = bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK; + bbr->r_ctl.rc_hpts_flags &= ~(PACE_TMR_MASK); + } +} + +static void +bbr_timer_stop(struct tcpcb *tp, uint32_t timer_type) +{ + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + bbr->rc_all_timers_stopped = 1; + return; +} + +/* + * stop all timers always returning 0. + */ +static int +bbr_stopall(struct tcpcb *tp) +{ + return (0); +} + +static void +bbr_timer_activate(struct tcpcb *tp, uint32_t timer_type, uint32_t delta) +{ + return; +} + +/* + * return true if a bbr timer (rack or tlp) is active. + */ +static int +bbr_timer_active(struct tcpcb *tp, uint32_t timer_type) +{ + return (0); +} + +static uint32_t +bbr_get_earliest_send_outstanding(struct tcp_bbr *bbr, struct bbr_sendmap *u_rsm, uint32_t cts) +{ + struct bbr_sendmap *rsm; + + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); + if ((rsm == NULL) || (u_rsm == rsm)) + return (cts); + return(rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)]); +} + +static void +bbr_update_rsm(struct tcpcb *tp, struct tcp_bbr *bbr, + struct bbr_sendmap *rsm, uint32_t cts, uint32_t pacing_time) +{ + int32_t idx; + + rsm->r_rtr_cnt++; + rsm->r_dupack = 0; + if (rsm->r_rtr_cnt > BBR_NUM_OF_RETRANS) { + rsm->r_rtr_cnt = BBR_NUM_OF_RETRANS; + rsm->r_flags |= BBR_OVERMAX; + } + if (rsm->r_flags & BBR_RWND_COLLAPSED) { + /* Take off the collapsed flag at rxt */ + rsm->r_flags &= ~BBR_RWND_COLLAPSED; + } + if (rsm->r_flags & BBR_MARKED_LOST) { + /* We have retransmitted, its no longer lost */ + rsm->r_flags &= ~BBR_MARKED_LOST; + bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; + } + if (rsm->r_flags & BBR_RXT_CLEARED) { + /* + * We hit a RXT timer on it and + * we cleared the "acked" flag. + * We now have it going back into + * flight, we can remove the cleared + * flag and possibly do accounting on + * this piece. + */ + rsm->r_flags &= ~BBR_RXT_CLEARED; + } + if ((rsm->r_rtr_cnt > 1) && ((rsm->r_flags & BBR_TLP) == 0)) { + bbr->r_ctl.rc_holes_rxt += (rsm->r_end - rsm->r_start); + rsm->r_rtr_bytes += (rsm->r_end - rsm->r_start); + } + idx = rsm->r_rtr_cnt - 1; + rsm->r_tim_lastsent[idx] = cts; + rsm->r_pacing_delay = pacing_time; + rsm->r_delivered = bbr->r_ctl.rc_delivered; + rsm->r_ts_valid = bbr->rc_ts_valid; + if (bbr->rc_ts_valid) + rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts; + if (bbr->r_ctl.r_app_limited_until) + rsm->r_app_limited = 1; + else + rsm->r_app_limited = 0; + if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) + rsm->r_bbr_state = bbr_state_val(bbr); + else + rsm->r_bbr_state = 8; + if (rsm->r_flags & BBR_ACKED) { + /* Problably MTU discovery messing with us */ + uint32_t old_flags; + + old_flags = rsm->r_flags; + rsm->r_flags &= ~BBR_ACKED; + bbr_log_type_rsmclear(bbr, cts, rsm, old_flags, __LINE__); + bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); + if (bbr->r_ctl.rc_sacked == 0) + bbr->r_ctl.rc_sacklast = NULL; + } + if (rsm->r_in_tmap) { + TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + } + TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 1; + if (rsm->r_flags & BBR_SACK_PASSED) { + /* We have retransmitted due to the SACK pass */ + rsm->r_flags &= ~BBR_SACK_PASSED; + rsm->r_flags |= BBR_WAS_SACKPASS; + } + rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts); + rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); + if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) { + rsm->r_is_gain = 1; + rsm->r_is_drain = 0; + } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) { + rsm->r_is_drain = 1; + rsm->r_is_gain = 0; + } else { + rsm->r_is_drain = 0; + rsm->r_is_gain = 0; + } + rsm->r_del_time = bbr->r_ctl.rc_del_time; /* TEMP GOOGLE CODE */ +} + +/* + * Returns 0, or the sequence where we stopped + * updating. We also update the lenp to be the amount + * of data left. + */ + +static uint32_t +bbr_update_entry(struct tcpcb *tp, struct tcp_bbr *bbr, + struct bbr_sendmap *rsm, uint32_t cts, int32_t *lenp, uint32_t pacing_time) +{ + /* + * We (re-)transmitted starting at rsm->r_start for some length + * (possibly less than r_end. + */ + struct bbr_sendmap *nrsm; + uint32_t c_end; + int32_t len; + + len = *lenp; + c_end = rsm->r_start + len; + if (SEQ_GEQ(c_end, rsm->r_end)) { + /* + * We retransmitted the whole piece or more than the whole + * slopping into the next rsm. + */ + bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); + if (c_end == rsm->r_end) { + *lenp = 0; + return (0); + } else { + int32_t act_len; + + /* Hangs over the end return whats left */ + act_len = rsm->r_end - rsm->r_start; + *lenp = (len - act_len); + return (rsm->r_end); + } + /* We don't get out of this block. */ + } + /* + * Here we retransmitted less than the whole thing which means we + * have to split this into what was transmitted and what was not. + */ + nrsm = bbr_alloc_full_limit(bbr); + if (nrsm == NULL) { + *lenp = 0; + return (0); + } + /* + * So here we are going to take the original rsm and make it what we + * retransmitted. nrsm will be the tail portion we did not + * retransmit. For example say the chunk was 1, 11 (10 bytes). And + * we retransmitted 5 bytes i.e. 1, 5. The original piece shrinks to + * 1, 6 and the new piece will be 6, 11. + */ + bbr_clone_rsm(bbr, nrsm, rsm, c_end); + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); + nrsm->r_dupack = 0; + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + rsm->r_flags &= (~BBR_HAS_FIN); + bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); + *lenp = 0; + return (0); +} + +static uint64_t +bbr_get_hardware_rate(struct tcp_bbr *bbr) +{ + uint64_t bw; + + bw = bbr_get_bw(bbr); + bw *= (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]; + bw /= (uint64_t)BBR_UNIT; + return(bw); +} + +static void +bbr_setup_less_of_rate(struct tcp_bbr *bbr, uint32_t cts, + uint64_t act_rate, uint64_t rate_wanted) +{ + /* + * We could not get a full gains worth + * of rate. + */ + if (get_filter_value(&bbr->r_ctl.rc_delrate) >= act_rate) { + /* we can't even get the real rate */ + uint64_t red; + + bbr->skip_gain = 1; + bbr->gain_is_limited = 0; + red = get_filter_value(&bbr->r_ctl.rc_delrate) - act_rate; + if (red) + filter_reduce_by(&bbr->r_ctl.rc_delrate, red, cts); + } else { + /* We can use a lower gain */ + bbr->skip_gain = 0; + bbr->gain_is_limited = 1; + } +} + +static void +bbr_update_hardware_pacing_rate(struct tcp_bbr *bbr, uint32_t cts) +{ + const struct tcp_hwrate_limit_table *nrte; + int error, rate = -1; + + if (bbr->r_ctl.crte == NULL) + return; + if ((bbr->rc_inp->inp_route.ro_rt == NULL) || + (bbr->rc_inp->inp_route.ro_rt->rt_ifp == NULL)) { + /* Lost our routes? */ + /* Clear the way for a re-attempt */ + bbr->bbr_attempt_hdwr_pace = 0; +lost_rate: + bbr->gain_is_limited = 0; + bbr->skip_gain = 0; + bbr->bbr_hdrw_pacing = 0; + counter_u64_add(bbr_flows_whdwr_pacing, -1); + counter_u64_add(bbr_flows_nohdwr_pacing, 1); + tcp_bbr_tso_size_check(bbr, cts); + return; + } + rate = bbr_get_hardware_rate(bbr); + nrte = tcp_chg_pacing_rate(bbr->r_ctl.crte, + bbr->rc_tp, + bbr->rc_inp->inp_route.ro_rt->rt_ifp, + rate, + (RS_PACING_GEQ|RS_PACING_SUB_OK), + &error); + if (nrte == NULL) { + goto lost_rate; + } + if (nrte != bbr->r_ctl.crte) { + bbr->r_ctl.crte = nrte; + if (error == 0) { + BBR_STAT_INC(bbr_hdwr_rl_mod_ok); + if (bbr->r_ctl.crte->rate < rate) { + /* We have a problem */ + bbr_setup_less_of_rate(bbr, cts, + bbr->r_ctl.crte->rate, rate); + } else { + /* We are good */ + bbr->gain_is_limited = 0; + bbr->skip_gain = 0; + } + } else { + /* A failure should release the tag */ + BBR_STAT_INC(bbr_hdwr_rl_mod_fail); + bbr->gain_is_limited = 0; + bbr->skip_gain = 0; + bbr->bbr_hdrw_pacing = 0; + } + bbr_type_log_hdwr_pacing(bbr, + bbr->r_ctl.crte->ptbl->rs_ifp, + rate, + ((bbr->r_ctl.crte == NULL) ? 0 : bbr->r_ctl.crte->rate), + __LINE__, + cts, + error); + } +} + +static void +bbr_adjust_for_hw_pacing(struct tcp_bbr *bbr, uint32_t cts) +{ + /* + * If we have hardware pacing support + * we need to factor that in for our + * TSO size. + */ + const struct tcp_hwrate_limit_table *rlp; + uint32_t cur_delay, seg_sz, maxseg, new_tso, delta, hdwr_delay; + + if ((bbr->bbr_hdrw_pacing == 0) || + (IN_RECOVERY(bbr->rc_tp->t_flags)) || + (bbr->r_ctl.crte == NULL)) + return; + if (bbr->hw_pacing_set == 0) { + /* Not yet by the hdwr pacing count delay */ + return; + } + if (bbr_hdwr_pace_adjust == 0) { + /* No adjustment */ + return; + } + rlp = bbr->r_ctl.crte; + if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) + maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; + else + maxseg = BBR_MIN_SEG - bbr->rc_last_options; + /* + * So lets first get the + * time we will take between + * TSO sized sends currently without + * hardware help. + */ + cur_delay = bbr_get_pacing_delay(bbr, BBR_UNIT, + bbr->r_ctl.rc_pace_max_segs, cts, 1); + hdwr_delay = bbr->r_ctl.rc_pace_max_segs / maxseg; + hdwr_delay *= rlp->time_between; + if (cur_delay > hdwr_delay) + delta = cur_delay - hdwr_delay; + else + delta = 0; + bbr_log_type_tsosize(bbr, cts, delta, cur_delay, hdwr_delay, + (bbr->r_ctl.rc_pace_max_segs / maxseg), + 1); + if (delta && + (delta < (max(rlp->time_between, + bbr->r_ctl.bbr_hptsi_segments_delay_tar)))) { + /* + * Now lets divide by the pacing + * time between each segment the + * hardware sends rounding up and + * derive a bytes from that. We multiply + * that by bbr_hdwr_pace_adjust to get + * more bang for our buck. + * + * The goal is to have the software pacer + * waiting no more than an additional + * pacing delay if we can (without the + * compensation i.e. x bbr_hdwr_pace_adjust). + */ + seg_sz = max(((cur_delay + rlp->time_between)/rlp->time_between), + (bbr->r_ctl.rc_pace_max_segs/maxseg)); + seg_sz *= bbr_hdwr_pace_adjust; + if (bbr_hdwr_pace_floor && + (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) { + /* Currently hardware paces + * out rs_min_seg segments at a time. + * We need to make sure we always send at least + * a full burst of bbr_hdwr_pace_floor down. + */ + seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg; + } + seg_sz *= maxseg; + } else if (delta == 0) { + /* + * The highest pacing rate is + * above our b/w gained. This means + * we probably are going quite fast at + * the hardware highest rate. Lets just multiply + * the calculated TSO size by the + * multiplier factor (its probably + * 4 segments in the default config for + * mlx). + */ + seg_sz = bbr->r_ctl.rc_pace_max_segs * bbr_hdwr_pace_adjust; + if (bbr_hdwr_pace_floor && + (seg_sz < bbr->r_ctl.crte->ptbl->rs_min_seg)) { + /* Currently hardware paces + * out rs_min_seg segments at a time. + * We need to make sure we always send at least + * a full burst of bbr_hdwr_pace_floor down. + */ + seg_sz = bbr->r_ctl.crte->ptbl->rs_min_seg; + } + } else { + /* + * The pacing time difference is so + * big that the hardware will + * pace out more rapidly then we + * really want and then we + * will have a long delay. Lets just keep + * the same TSO size so its as if + * we were not using hdwr pacing (we + * just gain a bit of spacing from the + * hardware if seg_sz > 1). + */ + seg_sz = bbr->r_ctl.rc_pace_max_segs; + } + if (seg_sz > bbr->r_ctl.rc_pace_max_segs) + new_tso = seg_sz; + else + new_tso = bbr->r_ctl.rc_pace_max_segs; + if (new_tso >= (PACE_MAX_IP_BYTES-maxseg)) + new_tso = PACE_MAX_IP_BYTES - maxseg; + + if (new_tso != bbr->r_ctl.rc_pace_max_segs) { + bbr_log_type_tsosize(bbr, cts, new_tso, 0, bbr->r_ctl.rc_pace_max_segs, maxseg, 0); + bbr->r_ctl.rc_pace_max_segs = new_tso; + } +} + +static void +tcp_bbr_tso_size_check(struct tcp_bbr *bbr, uint32_t cts) +{ + uint64_t bw; + uint32_t old_tso = 0, new_tso; + uint32_t maxseg, bytes; + uint32_t tls_seg=0; + /* + * Google/linux uses the following algorithm to determine + * the TSO size based on the b/w of the link (from Neal Cardwell email 9/27/18): + * + * bytes = bw_in_bytes_per_second / 1000 + * bytes = min(bytes, 64k) + * tso_segs = bytes / MSS + * if (bw < 1.2Mbs) + * min_tso_segs = 1 + * else + * min_tso_segs = 2 + * tso_segs = max(tso_segs, min_tso_segs) + * + * * Note apply a device specific limit (we apply this in the + * tcp_m_copym). + * Note that before the initial measurement is made google bursts out + * a full iwnd just like new-reno/cubic. + * + * We do not use this algorithm. Instead we + * use a two phased approach: + * + * if ( bw <= per-tcb-cross-over) + * goal_tso = calculate how much with this bw we + * can send in goal-time seconds. + * if (goal_tso > mss) + * seg = goal_tso / mss + * tso = seg * mss + * else + * tso = mss + * if (tso > per-tcb-max) + * tso = per-tcb-max + * else if ( bw > 512Mbps) + * tso = max-tso (64k/mss) + * else + * goal_tso = bw / per-tcb-divsor + * seg = (goal_tso + mss-1)/mss + * tso = seg * mss + * + * if (tso < per-tcb-floor) + * tso = per-tcb-floor + * if (tso > per-tcb-utter_max) + * tso = per-tcb-utter_max + * + * Note the default per-tcb-divisor is 1000 (same as google). + * the goal cross over is 30Mbps however. To recreate googles + * algorithm you need to set: + * + * cross-over = 23,168,000 bps + * goal-time = 18000 + * per-tcb-max = 2 + * per-tcb-divisor = 1000 + * per-tcb-floor = 1 + * + * This will get you "google bbr" behavior with respect to tso size. + * + * Note we do set anything TSO size until we are past the initial + * window. Before that we gnerally use either a single MSS + * or we use the full IW size (so we burst a IW at a time) + * Also note that Hardware-TLS is special and does alternate + * things to minimize PCI Bus Bandwidth use. + */ + + if (bbr->rc_tp->t_maxseg > bbr->rc_last_options) { + maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; + } else { + maxseg = BBR_MIN_SEG - bbr->rc_last_options; + } +#ifdef KERN_TLS + if (bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) { + tls_seg = ctf_get_opt_tls_size(bbr->rc_inp->inp_socket, bbr->rc_tp->snd_wnd); + bbr->r_ctl.rc_pace_min_segs = (tls_seg + bbr->rc_last_options); + } +#endif + old_tso = bbr->r_ctl.rc_pace_max_segs; + if (bbr->rc_past_init_win == 0) { + /* + * Not enough data has been acknowledged to make a + * judgement unless we are hardware TLS. Set up + * the inital TSO based on if we are sending a + * full IW at once or not. + */ + if (bbr->rc_use_google) + bbr->r_ctl.rc_pace_max_segs = ((bbr->rc_tp->t_maxseg - bbr->rc_last_options) * 2); + else if (bbr->bbr_init_win_cheat) + bbr->r_ctl.rc_pace_max_segs = bbr_initial_cwnd(bbr, bbr->rc_tp); + else + bbr->r_ctl.rc_pace_max_segs = bbr->rc_tp->t_maxseg - bbr->rc_last_options; + if (bbr->r_ctl.rc_pace_min_segs != bbr->rc_tp->t_maxseg) + bbr->r_ctl.rc_pace_min_segs = bbr->rc_tp->t_maxseg; +#ifdef KERN_TLS + if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) && tls_seg) { + /* + * For hardware TLS we set our min to the tls_seg size. + */ + bbr->r_ctl.rc_pace_max_segs = tls_seg; + bbr->r_ctl.rc_pace_min_segs = tls_seg + bbr->rc_last_options; + } +#endif + if (bbr->r_ctl.rc_pace_max_segs == 0) { + bbr->r_ctl.rc_pace_max_segs = maxseg; + } + bbr_log_type_tsosize(bbr, cts, bbr->r_ctl.rc_pace_max_segs, tls_seg, old_tso, maxseg, 0); +#ifdef KERN_TLS + if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) == 0) +#endif + bbr_adjust_for_hw_pacing(bbr, cts); + return; + } + /** + * Now lets set the TSO goal based on our delivery rate in + * bytes per second. Note we only do this if + * we have acked at least the initial cwnd worth of data. + */ + bw = bbr_get_bw(bbr); + if (IN_RECOVERY(bbr->rc_tp->t_flags) && + (bbr->rc_use_google == 0)) { + /* We clamp to one MSS in recovery */ + new_tso = maxseg; + } else if (bbr->rc_use_google) { + int min_tso_segs; + + /* Google considers the gain too */ + if (bbr->r_ctl.rc_bbr_hptsi_gain != BBR_UNIT) { + bw *= bbr->r_ctl.rc_bbr_hptsi_gain; + bw /= BBR_UNIT; + } + bytes = bw / 1024; + if (bytes > (64 * 1024)) + bytes = 64 * 1024; + new_tso = bytes / maxseg; + if (bw < ONE_POINT_TWO_MEG) + min_tso_segs = 1; + else + min_tso_segs = 2; + if (new_tso < min_tso_segs) + new_tso = min_tso_segs; + new_tso *= maxseg; + } else if (bbr->rc_no_pacing) { + new_tso = (PACE_MAX_IP_BYTES / maxseg) * maxseg; + } else if (bw <= bbr->r_ctl.bbr_cross_over) { + /* + * Calculate the worse case b/w TSO if we are inserting no + * more than a delay_target number of TSO's. + */ + uint32_t tso_len, min_tso; + + tso_len = bbr_get_pacing_length(bbr, BBR_UNIT, bbr->r_ctl.bbr_hptsi_segments_delay_tar, bw); + if (tso_len > maxseg) { + new_tso = tso_len / maxseg; + if (new_tso > bbr->r_ctl.bbr_hptsi_segments_max) + new_tso = bbr->r_ctl.bbr_hptsi_segments_max; + new_tso *= maxseg; + } else { + /* + * less than a full sized frame yikes.. long rtt or + * low bw? + */ + min_tso = bbr_minseg(bbr); + if ((tso_len > min_tso) && (bbr_all_get_min == 0)) + new_tso = rounddown(tso_len, min_tso); + else + new_tso = min_tso; + } + } else if (bw > FIVETWELVE_MBPS) { + /* + * This guy is so fast b/w wise that we can TSO as large as + * possible of segments that the NIC will allow. + */ + new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg); + } else { + /* + * This formula is based on attempting to send a segment or + * more every bbr_hptsi_per_second. The default is 1000 + * which means you are targeting what you can send every 1ms + * based on the peers bw. + * + * If the number drops to say 500, then you are looking more + * at 2ms and you will raise how much we send in a single + * TSO thus saving CPU (less bbr_output_wtime() calls). The + * trade off of course is you will send more at once and + * thus tend to clump up the sends into larger "bursts" + * building a queue. + */ + bw /= bbr->r_ctl.bbr_hptsi_per_second; + new_tso = roundup(bw, (uint64_t)maxseg); + /* + * Gate the floor to match what our lower than 48Mbps + * algorithm does. The ceiling (bbr_hptsi_segments_max) thus + * becomes the floor for this calculation. + */ + if (new_tso < (bbr->r_ctl.bbr_hptsi_segments_max * maxseg)) + new_tso = (bbr->r_ctl.bbr_hptsi_segments_max * maxseg); + } + if (bbr->r_ctl.bbr_hptsi_segments_floor && (new_tso < (maxseg * bbr->r_ctl.bbr_hptsi_segments_floor))) + new_tso = maxseg * bbr->r_ctl.bbr_hptsi_segments_floor; + if (new_tso > PACE_MAX_IP_BYTES) + new_tso = rounddown(PACE_MAX_IP_BYTES, maxseg); + /* Enforce an utter maximum if we are not HW-TLS */ +#ifdef KERN_TLS + if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) == 0) +#endif + if (bbr->r_ctl.bbr_utter_max && (new_tso > (bbr->r_ctl.bbr_utter_max * maxseg))) { + new_tso = bbr->r_ctl.bbr_utter_max * maxseg; + } +#ifdef KERN_TLS + if (tls_seg) { + /* + * Lets move the output size + * up to 1 or more TLS record sizes. + */ + uint32_t temp; + + temp = roundup(new_tso, tls_seg); + new_tso = temp; + /* Back down if needed to under a full frame */ + while (new_tso > PACE_MAX_IP_BYTES) + new_tso -= tls_seg; + } +#endif + if (old_tso != new_tso) { + /* Only log changes */ + bbr_log_type_tsosize(bbr, cts, new_tso, tls_seg, old_tso, maxseg, 0); + bbr->r_ctl.rc_pace_max_segs = new_tso; + } +#ifdef KERN_TLS + if ((bbr->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) && + tls_seg) { + bbr->r_ctl.rc_pace_min_segs = tls_seg + bbr->rc_last_options; + } else +#endif + /* We have hardware pacing and not hardware TLS! */ + bbr_adjust_for_hw_pacing(bbr, cts); +} + +static void +bbr_log_output(struct tcp_bbr *bbr, struct tcpcb *tp, struct tcpopt *to, int32_t len, + uint32_t seq_out, uint8_t th_flags, int32_t err, uint32_t cts, + struct mbuf *mb, int32_t * abandon, struct bbr_sendmap *hintrsm, uint32_t delay_calc, + struct sockbuf *sb) +{ + + struct bbr_sendmap *rsm, *nrsm; + register uint32_t snd_max, snd_una; + uint32_t pacing_time; + /* + * Add to the RACK log of packets in flight or retransmitted. If + * there is a TS option we will use the TS echoed, if not we will + * grab a TS. + * + * Retransmissions will increment the count and move the ts to its + * proper place. Note that if options do not include TS's then we + * won't be able to effectively use the ACK for an RTT on a retran. + * + * Notes about r_start and r_end. Lets consider a send starting at + * sequence 1 for 10 bytes. In such an example the r_start would be + * 1 (starting sequence) but the r_end would be r_start+len i.e. 11. + * This means that r_end is actually the first sequence for the next + * slot (11). + * + */ + INP_WLOCK_ASSERT(tp->t_inpcb); + if (err) { + /* + * We don't log errors -- we could but snd_max does not + * advance in this case either. + */ + return; + } + if (th_flags & TH_RST) { + /* + * We don't log resets and we return immediately from + * sending + */ + *abandon = 1; + return; + } + snd_una = tp->snd_una; + if (th_flags & (TH_SYN | TH_FIN) && (hintrsm == NULL)) { + /* + * The call to bbr_log_output is made before bumping + * snd_max. This means we can record one extra byte on a SYN + * or FIN if seq_out is adding more on and a FIN is present + * (and we are not resending). + */ + if (th_flags & TH_SYN) + len++; + if (th_flags & TH_FIN) + len++; + } + if (SEQ_LEQ((seq_out + len), snd_una)) { + /* Are sending an old segment to induce an ack (keep-alive)? */ + return; + } + if (SEQ_LT(seq_out, snd_una)) { + /* huh? should we panic? */ + uint32_t end; + + end = seq_out + len; + seq_out = snd_una; + len = end - seq_out; + } + snd_max = tp->snd_max; + if (len == 0) { + /* We don't log zero window probes */ + return; + } + pacing_time = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, len, cts, 1); + /* First question is it a retransmission? */ + if (seq_out == snd_max) { +again: + rsm = bbr_alloc(bbr); + if (rsm == NULL) { + return; + } + rsm->r_flags = 0; + if (th_flags & TH_SYN) + rsm->r_flags |= BBR_HAS_SYN; + if (th_flags & TH_FIN) + rsm->r_flags |= BBR_HAS_FIN; + rsm->r_tim_lastsent[0] = cts; + rsm->r_rtr_cnt = 1; + rsm->r_rtr_bytes = 0; + rsm->r_start = seq_out; + rsm->r_end = rsm->r_start + len; + rsm->r_dupack = 0; + rsm->r_delivered = bbr->r_ctl.rc_delivered; + rsm->r_pacing_delay = pacing_time; + rsm->r_ts_valid = bbr->rc_ts_valid; + if (bbr->rc_ts_valid) + rsm->r_del_ack_ts = bbr->r_ctl.last_inbound_ts; + rsm->r_del_time = bbr->r_ctl.rc_del_time; + if (bbr->r_ctl.r_app_limited_until) + rsm->r_app_limited = 1; + else + rsm->r_app_limited = 0; + rsm->r_first_sent_time = bbr_get_earliest_send_outstanding(bbr, rsm, cts); + rsm->r_flight_at_send = ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + /* + * Here we must also add in this rsm since snd_max + * is updated after we return from a new send. + */ + rsm->r_flight_at_send += len; + TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next); + TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 1; + if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) + rsm->r_bbr_state = bbr_state_val(bbr); + else + rsm->r_bbr_state = 8; + if (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT) { + rsm->r_is_gain = 1; + rsm->r_is_drain = 0; + } else if (bbr->r_ctl.rc_bbr_hptsi_gain < BBR_UNIT) { + rsm->r_is_drain = 1; + rsm->r_is_gain = 0; + } else { + rsm->r_is_drain = 0; + rsm->r_is_gain = 0; + } + return; + } + /* + * If we reach here its a retransmission and we need to find it. + */ +more: + if (hintrsm && (hintrsm->r_start == seq_out)) { + rsm = hintrsm; + hintrsm = NULL; + } else if (bbr->r_ctl.rc_next) { + /* We have a hint from a previous run */ + rsm = bbr->r_ctl.rc_next; + } else { + /* No hints sorry */ + rsm = NULL; + } + if ((rsm) && (rsm->r_start == seq_out)) { + /* + * We used rc_next or hintrsm to retransmit, hopefully the + * likely case. + */ + seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time); + if (len == 0) { + return; + } else { + goto more; + } + } + /* Ok it was not the last pointer go through it the hard way. */ + TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { + if (rsm->r_start == seq_out) { + seq_out = bbr_update_entry(tp, bbr, rsm, cts, &len, pacing_time); + bbr->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); + if (len == 0) { + return; + } else { + continue; + } + } + if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) { + /* Transmitted within this piece */ + /* + * Ok we must split off the front and then let the + * update do the rest + */ + nrsm = bbr_alloc_full_limit(bbr); + if (nrsm == NULL) { + bbr_update_rsm(tp, bbr, rsm, cts, pacing_time); + return; + } + /* + * copy rsm to nrsm and then trim the front of rsm + * to not include this part. + */ + bbr_clone_rsm(bbr, nrsm, rsm, seq_out); + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + rsm->r_flags &= (~BBR_HAS_FIN); + seq_out = bbr_update_entry(tp, bbr, nrsm, cts, &len, pacing_time); + if (len == 0) { + return; + } + } + } + /* + * Hmm not found in map did they retransmit both old and on into the + * new? + */ + if (seq_out == tp->snd_max) { + goto again; + } else if (SEQ_LT(seq_out, tp->snd_max)) { +#ifdef BBR_INVARIANTS + printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n", + seq_out, len, tp->snd_una, tp->snd_max); + printf("Starting Dump of all rack entries\n"); + TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { + printf("rsm:%p start:%u end:%u\n", + rsm, rsm->r_start, rsm->r_end); + } + printf("Dump complete\n"); + panic("seq_out not found rack:%p tp:%p", + bbr, tp); +#endif + } else { +#ifdef BBR_INVARIANTS + /* + * Hmm beyond sndmax? (only if we are using the new rtt-pack + * flag) + */ + panic("seq_out:%u(%d) is beyond snd_max:%u tp:%p", + seq_out, len, tp->snd_max, tp); +#endif + } +} + +static void +bbr_collapse_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, int32_t rtt) +{ + /* + * Collapse timeout back the cum-ack moved. + */ + tp->t_rxtshift = 0; + tp->t_softerror = 0; +} + + +static void +tcp_bbr_xmit_timer(struct tcp_bbr *bbr, uint32_t rtt_usecs, uint32_t rsm_send_time, uint32_t r_start, uint32_t tsin) +{ + bbr->rtt_valid = 1; + bbr->r_ctl.cur_rtt = rtt_usecs; + bbr->r_ctl.ts_in = tsin; + if (rsm_send_time) + bbr->r_ctl.cur_rtt_send_time = rsm_send_time; +} + +static void +bbr_make_timestamp_determination(struct tcp_bbr *bbr) +{ + /** + * We have in our bbr control: + * 1) The timestamp we started observing cum-acks (bbr->r_ctl.bbr_ts_check_tstmp). + * 2) Our timestamp indicating when we sent that packet (bbr->r_ctl.rsm->bbr_ts_check_our_cts). + * 3) The current timestamp that just came in (bbr->r_ctl.last_inbound_ts) + * 4) The time that the packet that generated that ack was sent (bbr->r_ctl.cur_rtt_send_time) + * + * Now we can calculate the time between the sends by doing: + * + * delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts + * + * And the peer's time between receiving them by doing: + * + * peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp + * + * We want to figure out if the timestamp values are in msec, 10msec or usec. + * We also may find that we can't use the timestamps if say we see + * that the peer_delta indicates that though we may have taken 10ms to + * pace out the data, it only saw 1ms between the two packets. This would + * indicate that somewhere on the path is a batching entity that is giving + * out time-slices of the actual b/w. This would mean we could not use + * reliably the peers timestamps. + * + * We expect delta > peer_delta initially. Until we figure out the + * timestamp difference which we will store in bbr->r_ctl.bbr_peer_tsratio. + * If we place 1000 there then its a ms vs our usec. If we place 10000 there + * then its 10ms vs our usec. If the peer is running a usec clock we would + * put a 1 there. If the value is faster then ours, we will disable the + * use of timestamps (though we could revist this later if we find it to be not + * just an isolated one or two flows)). + * + * To detect the batching middle boxes we will come up with our compensation and + * if with it in place, we find the peer is drastically off (by some margin) in + * the smaller direction, then we will assume the worst case and disable use of timestamps. + * + */ + uint64_t delta, peer_delta, delta_up; + + delta = bbr->r_ctl.cur_rtt_send_time - bbr->r_ctl.bbr_ts_check_our_cts; + if (delta < bbr_min_usec_delta) { + /* + * Have not seen a min amount of time + * between our send times so we can + * make a determination of the timestamp + * yet. + */ + return; + } + peer_delta = bbr->r_ctl.last_inbound_ts - bbr->r_ctl.bbr_ts_check_tstmp; + if (peer_delta < bbr_min_peer_delta) { + /* + * We may have enough in the form of + * our delta but the peers number + * has not changed that much. It could + * be its clock ratio is such that + * we need more data (10ms tick) or + * there may be other compression scenarios + * going on. In any event we need the + * spread to be larger. + */ + return; + } + /* Ok lets first see which way our delta is going */ + if (peer_delta > delta) { + /* Very unlikely, the peer without + * compensation shows that it saw + * the two sends arrive further apart + * then we saw then in micro-seconds. + */ + if (peer_delta < (delta + ((delta * (uint64_t)1000)/ (uint64_t)bbr_delta_percent))) { + /* well it looks like the peer is a micro-second clock. */ + bbr->rc_ts_clock_set = 1; + bbr->r_ctl.bbr_peer_tsratio = 1; + } else { + bbr->rc_ts_cant_be_used = 1; + bbr->rc_ts_clock_set = 1; + } + return; + } + /* Ok we know that the peer_delta is smaller than our send distance */ + bbr->rc_ts_clock_set = 1; + /* First question is it within the percentage that they are using usec time? */ + delta_up = (peer_delta * 1000) / (uint64_t)bbr_delta_percent; + if ((peer_delta + delta_up) >= delta) { + /* Its a usec clock */ + bbr->r_ctl.bbr_peer_tsratio = 1; + bbr_log_tstmp_validation(bbr, peer_delta, delta); + return; + } + /* Ok if not usec, what about 10usec (though unlikely)? */ + delta_up = (peer_delta * 1000 * 10) / (uint64_t)bbr_delta_percent; + if (((peer_delta * 10) + delta_up) >= delta) { + bbr->r_ctl.bbr_peer_tsratio = 10; + bbr_log_tstmp_validation(bbr, peer_delta, delta); + return; + } + /* And what about 100usec (though again unlikely)? */ + delta_up = (peer_delta * 1000 * 100) / (uint64_t)bbr_delta_percent; + if (((peer_delta * 100) + delta_up) >= delta) { + bbr->r_ctl.bbr_peer_tsratio = 100; + bbr_log_tstmp_validation(bbr, peer_delta, delta); + return; + } + /* And how about 1 msec (the most likely one)? */ + delta_up = (peer_delta * 1000 * 1000) / (uint64_t)bbr_delta_percent; + if (((peer_delta * 1000) + delta_up) >= delta) { + bbr->r_ctl.bbr_peer_tsratio = 1000; + bbr_log_tstmp_validation(bbr, peer_delta, delta); + return; + } + /* Ok if not msec could it be 10 msec? */ + delta_up = (peer_delta * 1000 * 10000) / (uint64_t)bbr_delta_percent; + if (((peer_delta * 10000) + delta_up) >= delta) { + bbr->r_ctl.bbr_peer_tsratio = 10000; + return; + } + /* If we fall down here the clock tick so slowly we can't use it */ + bbr->rc_ts_cant_be_used = 1; + bbr->r_ctl.bbr_peer_tsratio = 0; + bbr_log_tstmp_validation(bbr, peer_delta, delta); +} + +/* + * Collect new round-trip time estimate + * and update averages and current timeout. + */ +static void +tcp_bbr_xmit_timer_commit(struct tcp_bbr *bbr, struct tcpcb *tp, uint32_t cts) +{ + int32_t delta; + uint32_t rtt, tsin; + int32_t rtt_ticks; + + + if (bbr->rtt_valid == 0) + /* No valid sample */ + return; + + rtt = bbr->r_ctl.cur_rtt; + tsin = bbr->r_ctl.ts_in; + if (bbr->rc_prtt_set_ts) { + /* + * We are to force feed the rttProp filter due + * to an entry into PROBE_RTT. This assures + * that the times are sync'd between when we + * go into PROBE_RTT and the filter expiration. + * + * Google does not use a true filter, so they do + * this implicitly since they only keep one value + * and when they enter probe-rtt they update the + * value to the newest rtt. + */ + uint32_t rtt_prop; + + bbr->rc_prtt_set_ts = 0; + rtt_prop = get_filter_value_small(&bbr->r_ctl.rc_rttprop); + if (rtt > rtt_prop) + filter_increase_by_small(&bbr->r_ctl.rc_rttprop, (rtt - rtt_prop), cts); + else + apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); + } + if (bbr->rc_ack_was_delayed) + rtt += bbr->r_ctl.rc_ack_hdwr_delay; + + if (rtt < bbr->r_ctl.rc_lowest_rtt) + bbr->r_ctl.rc_lowest_rtt = rtt; + bbr_log_rtt_sample(bbr, rtt, tsin); + if (bbr->r_init_rtt) { + /* + * The initial rtt is not-trusted, nuke it and lets get + * our first valid measurement in. + */ + bbr->r_init_rtt = 0; + tp->t_srtt = 0; + } + if ((bbr->rc_ts_clock_set == 0) && bbr->rc_ts_valid) { + /* + * So we have not yet figured out + * what the peers TSTMP value is + * in (most likely ms). We need a + * series of cum-ack's to determine + * this reliably. + */ + if (bbr->rc_ack_is_cumack) { + if (bbr->rc_ts_data_set) { + /* Lets attempt to determine the timestamp granularity. */ + bbr_make_timestamp_determination(bbr); + } else { + bbr->rc_ts_data_set = 1; + bbr->r_ctl.bbr_ts_check_tstmp = bbr->r_ctl.last_inbound_ts; + bbr->r_ctl.bbr_ts_check_our_cts = bbr->r_ctl.cur_rtt_send_time; + } + } else { + /* + * We have to have consecutive acks + * reset any "filled" state to none. + */ + bbr->rc_ts_data_set = 0; + } + } + /* Round it up */ + rtt_ticks = USEC_2_TICKS((rtt + (USECS_IN_MSEC - 1))); + if (rtt_ticks == 0) + rtt_ticks = 1; + if (tp->t_srtt != 0) { + /* + * srtt is stored as fixed point with 5 bits after the + * binary point (i.e., scaled by 8). The following magic is + * equivalent to the smoothing algorithm in rfc793 with an + * alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed point). + * Adjust rtt to origin 0. + */ + + delta = ((rtt_ticks - 1) << TCP_DELTA_SHIFT) + - (tp->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)); + + tp->t_srtt += delta; + if (tp->t_srtt <= 0) + tp->t_srtt = 1; + + /* + * We accumulate a smoothed rtt variance (actually, a + * smoothed mean difference), then set the retransmit timer + * to smoothed rtt + 4 times the smoothed variance. rttvar + * is stored as fixed point with 4 bits after the binary + * point (scaled by 16). The following is equivalent to + * rfc793 smoothing with an alpha of .75 (rttvar = + * rttvar*3/4 + |delta| / 4). This replaces rfc793's + * wired-in beta. + */ + if (delta < 0) + delta = -delta; + delta -= tp->t_rttvar >> (TCP_RTTVAR_SHIFT - TCP_DELTA_SHIFT); + tp->t_rttvar += delta; + if (tp->t_rttvar <= 0) + tp->t_rttvar = 1; + if (tp->t_rttbest > tp->t_srtt + tp->t_rttvar) + tp->t_rttbest = tp->t_srtt + tp->t_rttvar; + } else { + /* + * No rtt measurement yet - use the unsmoothed rtt. Set the + * variance to half the rtt (so our first retransmit happens + * at 3*rtt). + */ + tp->t_srtt = rtt_ticks << TCP_RTT_SHIFT; + tp->t_rttvar = rtt_ticks << (TCP_RTTVAR_SHIFT - 1); + tp->t_rttbest = tp->t_srtt + tp->t_rttvar; + } + TCPSTAT_INC(tcps_rttupdated); + tp->t_rttupdated++; +#ifdef NETFLIX_STATS + stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RTT, imax(0, rtt_ticks)); +#endif + /* + * the retransmit should happen at rtt + 4 * rttvar. Because of the + * way we do the smoothing, srtt and rttvar will each average +1/2 + * tick of bias. When we compute the retransmit timer, we want 1/2 + * tick of rounding and 1 extra tick because of +-1/2 tick + * uncertainty in the firing of the timer. The bias will give us + * exactly the 1.5 tick we need. But, because the bias is + * statistical, we have to test that we don't drop below the minimum + * feasible timer (which is 2 ticks). + */ + TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp), + max(MSEC_2_TICKS(bbr->r_ctl.rc_min_rto_ms), rtt_ticks + 2), + MSEC_2_TICKS(((uint32_t)bbr->rc_max_rto_sec) * 1000)); + + /* + * We received an ack for a packet that wasn't retransmitted; it is + * probably safe to discard any error indications we've received + * recently. This isn't quite right, but close enough for now (a + * route might have failed after we sent a segment, and the return + * path might not be symmetrical). + */ + tp->t_softerror = 0; + rtt = (TICKS_2_USEC(bbr->rc_tp->t_srtt) >> TCP_RTT_SHIFT); + if (bbr->r_ctl.bbr_smallest_srtt_this_state > rtt) + bbr->r_ctl.bbr_smallest_srtt_this_state = rtt; +} + +static void +bbr_earlier_retran(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, + uint32_t t, uint32_t cts, int ack_type) +{ + /* + * For this RSM, we acknowledged the data from a previous + * transmission, not the last one we made. This means we did a false + * retransmit. + */ + if (rsm->r_flags & BBR_HAS_FIN) { + /* + * The sending of the FIN often is multiple sent when we + * have everything outstanding ack'd. We ignore this case + * since its over now. + */ + return; + } + if (rsm->r_flags & BBR_TLP) { + /* + * We expect TLP's to have this occur often + */ + bbr->rc_tlp_rtx_out = 0; + return; + } + if (ack_type != BBR_CUM_ACKED) { + /* + * If it was not a cum-ack we + * don't really know for sure since + * the timestamp could be from some + * other transmission. + */ + return; + } + + if (rsm->r_flags & BBR_WAS_SACKPASS) { + /* + * We retransmitted based on a sack and the earlier + * retransmission ack'd it - re-ordering is occuring. + */ + BBR_STAT_INC(bbr_reorder_seen); + bbr->r_ctl.rc_reorder_ts = cts; + } + /* Back down the loss count */ + if (rsm->r_flags & BBR_MARKED_LOST) { + bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; + bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; + rsm->r_flags &= ~BBR_MARKED_LOST; + if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) + /* LT sampling also needs adjustment */ + bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; + } + /***** RRS HERE ************************/ + /* Do we need to do this??? */ + /* bbr_reset_lt_bw_sampling(bbr, cts); */ + /***** RRS HERE ************************/ + BBR_STAT_INC(bbr_badfr); + BBR_STAT_ADD(bbr_badfr_bytes, (rsm->r_end - rsm->r_start)); +} + + +static void +bbr_set_reduced_rtt(struct tcp_bbr *bbr, uint32_t cts, uint32_t line) +{ + bbr->r_ctl.rc_rtt_shrinks = cts; + if (bbr_can_force_probertt && + (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) && + ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) { + /* + * We should enter probe-rtt its been too long + * since we have been there. + */ + bbr_enter_probe_rtt(bbr, cts, __LINE__); + } else + bbr_check_probe_rtt_limits(bbr, cts); +} + +static void +tcp_bbr_commit_bw(struct tcp_bbr *bbr, uint32_t cts) +{ + uint64_t orig_bw; + + if (bbr->r_ctl.rc_bbr_cur_del_rate == 0) { + /* We never apply a zero measurment */ + bbr_log_type_bbrupd(bbr, 20, cts, 0, 0, + 0, 0, 0, 0, 0, 0); + return; + } + if (bbr->r_ctl.r_measurement_count < 0xffffffff) + bbr->r_ctl.r_measurement_count++; + orig_bw = get_filter_value(&bbr->r_ctl.rc_delrate); + apply_filter_max(&bbr->r_ctl.rc_delrate, bbr->r_ctl.rc_bbr_cur_del_rate, bbr->r_ctl.rc_pkt_epoch); + bbr_log_type_bbrupd(bbr, 21, cts, (uint32_t)orig_bw, + (uint32_t)get_filter_value(&bbr->r_ctl.rc_delrate), + 0, 0, 0, 0, 0, 0); + if (orig_bw && + (orig_bw != get_filter_value(&bbr->r_ctl.rc_delrate))) { + if (bbr->bbr_hdrw_pacing) { + /* + * Apply a new rate to the hardware + * possibly. + */ + bbr_update_hardware_pacing_rate(bbr, cts); + } + bbr_set_state_target(bbr, __LINE__); + tcp_bbr_tso_size_check(bbr, cts); + if (bbr->r_recovery_bw) { + bbr_setup_red_bw(bbr, cts); + bbr_log_type_bw_reduce(bbr, BBR_RED_BW_USELRBW); + } + } else if ((orig_bw == 0) && get_filter_value(&bbr->r_ctl.rc_delrate)) + tcp_bbr_tso_size_check(bbr, cts); +} + +static void +bbr_nf_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts) +{ + if (bbr->rc_in_persist == 0) { + /* We log only when not in persist */ + /* Translate to a Bytes Per Second */ + uint64_t tim, bw, ts_diff, ts_bw; + uint32_t upper, lower, delivered; + + if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time)) + tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time); + else + tim = 1; + /* + * Now that we have processed the tim (skipping the sample + * or possibly updating the time, go ahead and + * calculate the cdr. + */ + delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered); + bw = (uint64_t)delivered; + bw *= (uint64_t)USECS_IN_SECOND; + bw /= tim; + if (bw == 0) { + /* We must have a calculatable amount */ + return; + } + upper = (bw >> 32) & 0x00000000ffffffff; + lower = bw & 0x00000000ffffffff; + /* + * If we are using this b/w shove it in now so we + * can see in the trace viewer if it gets over-ridden. + */ + if (rsm->r_ts_valid && + bbr->rc_ts_valid && + bbr->rc_ts_clock_set && + (bbr->rc_ts_cant_be_used == 0) && + bbr->rc_use_ts_limit) { + ts_diff = max((bbr->r_ctl.last_inbound_ts - rsm->r_del_ack_ts), 1); + ts_diff *= bbr->r_ctl.bbr_peer_tsratio; + if ((delivered == 0) || + (rtt < 1000)) { + /* Can't use the ts */ + bbr_log_type_bbrupd(bbr, 61, cts, + ts_diff, + bbr->r_ctl.last_inbound_ts, + rsm->r_del_ack_ts, 0, + 0, 0, 0, delivered); + } else { + ts_bw = (uint64_t)delivered; + ts_bw *= (uint64_t)USECS_IN_SECOND; + ts_bw /= ts_diff; + bbr_log_type_bbrupd(bbr, 62, cts, + (ts_bw >> 32), + (ts_bw & 0xffffffff), 0, 0, + 0, 0, ts_diff, delivered); + if ((bbr->ts_can_raise) && + (ts_bw > bw)) { + bbr_log_type_bbrupd(bbr, 8, cts, + delivered, + ts_diff, + (bw >> 32), + (bw & 0x00000000ffffffff), + 0, 0, 0, 0); + bw = ts_bw; + } else if (ts_bw && (ts_bw < bw)) { + bbr_log_type_bbrupd(bbr, 7, cts, + delivered, + ts_diff, + (bw >> 32), + (bw & 0x00000000ffffffff), + 0, 0, 0, 0); + bw = ts_bw; + } + } + } + if (rsm->r_first_sent_time && + TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) { + uint64_t sbw, sti; + /* + * We use what was in flight at the time of our + * send and the size of this send to figure + * out what we have been sending at (amount). + * For the time we take from the time of + * the send of the first send outstanding + * until this send plus this sends pacing + * time. This gives us a good calculation + * as to the rate we have been sending at. + */ + + sbw = (uint64_t)(rsm->r_flight_at_send); + sbw *= (uint64_t)USECS_IN_SECOND; + sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time; + sti += rsm->r_pacing_delay; + sbw /= sti; + if (sbw < bw) { + bbr_log_type_bbrupd(bbr, 6, cts, + delivered, + (uint32_t)sti, + (bw >> 32), + (uint32_t)bw, + rsm->r_first_sent_time, 0, (sbw >> 32), + (uint32_t)sbw); + bw = sbw; + } + } + /* Use the google algorithm for b/w measurements */ + bbr->r_ctl.rc_bbr_cur_del_rate = bw; + if ((rsm->r_app_limited == 0) || + (bw > get_filter_value(&bbr->r_ctl.rc_delrate))) { + tcp_bbr_commit_bw(bbr, cts); + bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered, + 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time); + } + } +} + +static void +bbr_google_measurement(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts) +{ + if (bbr->rc_in_persist == 0) { + /* We log only when not in persist */ + /* Translate to a Bytes Per Second */ + uint64_t tim, bw; + uint32_t upper, lower, delivered; + int no_apply = 0; + + if (TSTMP_GT(bbr->r_ctl.rc_del_time, rsm->r_del_time)) + tim = (uint64_t)(bbr->r_ctl.rc_del_time - rsm->r_del_time); + else + tim = 1; + /* + * Now that we have processed the tim (skipping the sample + * or possibly updating the time, go ahead and + * calculate the cdr. + */ + delivered = (bbr->r_ctl.rc_delivered - rsm->r_delivered); + bw = (uint64_t)delivered; + bw *= (uint64_t)USECS_IN_SECOND; + bw /= tim; + if (tim < bbr->r_ctl.rc_lowest_rtt) { + bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered, + tim, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0); + + no_apply = 1; + } + upper = (bw >> 32) & 0x00000000ffffffff; + lower = bw & 0x00000000ffffffff; + /* + * If we are using this b/w shove it in now so we + * can see in the trace viewer if it gets over-ridden. + */ + bbr->r_ctl.rc_bbr_cur_del_rate = bw; + /* Gate by the sending rate */ + if (rsm->r_first_sent_time && + TSTMP_GT(rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)],rsm->r_first_sent_time)) { + uint64_t sbw, sti; + /* + * We use what was in flight at the time of our + * send and the size of this send to figure + * out what we have been sending at (amount). + * For the time we take from the time of + * the send of the first send outstanding + * until this send plus this sends pacing + * time. This gives us a good calculation + * as to the rate we have been sending at. + */ + + sbw = (uint64_t)(rsm->r_flight_at_send); + sbw *= (uint64_t)USECS_IN_SECOND; + sti = rsm->r_tim_lastsent[(rsm->r_rtr_cnt -1)] - rsm->r_first_sent_time; + sti += rsm->r_pacing_delay; + sbw /= sti; + if (sbw < bw) { + bbr_log_type_bbrupd(bbr, 6, cts, + delivered, + (uint32_t)sti, + (bw >> 32), + (uint32_t)bw, + rsm->r_first_sent_time, 0, (sbw >> 32), + (uint32_t)sbw); + bw = sbw; + } + if ((sti > tim) && + (sti < bbr->r_ctl.rc_lowest_rtt)) { + bbr_log_type_bbrupd(bbr, 99, cts, (uint32_t)tim, delivered, + (uint32_t)sti, bbr->r_ctl.rc_lowest_rtt, 0, 0, 0, 0); + no_apply = 1; + } else + no_apply = 0; + } + bbr->r_ctl.rc_bbr_cur_del_rate = bw; + if ((no_apply == 0) && + ((rsm->r_app_limited == 0) || + (bw > get_filter_value(&bbr->r_ctl.rc_delrate)))) { + tcp_bbr_commit_bw(bbr, cts); + bbr_log_type_bbrupd(bbr, 10, cts, (uint32_t)tim, delivered, + 0, 0, 0, 0, bbr->r_ctl.rc_del_time, rsm->r_del_time); + } + } +} + + +static void +bbr_update_bbr_info(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, uint32_t rtt, uint32_t cts, uint32_t tsin, + uint32_t uts, int32_t match, uint32_t rsm_send_time, int32_t ack_type, struct tcpopt *to) +{ + uint64_t old_rttprop; + + /* Update our delivery time and amount */ + bbr->r_ctl.rc_delivered += (rsm->r_end - rsm->r_start); + bbr->r_ctl.rc_del_time = cts; + if (rtt == 0) { + /* + * 0 means its a retransmit, for now we don't use these for + * the rest of BBR. + */ + return; + } + if ((bbr->rc_use_google == 0) && + (match != BBR_RTT_BY_EXACTMATCH) && + (match != BBR_RTT_BY_TIMESTAMP)){ + /* + * We get a lot of rtt updates, lets not pay attention to + * any that are not an exact match. That way we don't have + * to worry about timestamps and the whole nonsense of + * unsure if its a retransmission etc (if we ever had the + * timestamp fixed to always have the last thing sent this + * would not be a issue). + */ + return; + } + if ((bbr_no_retran && bbr->rc_use_google) && + (match != BBR_RTT_BY_EXACTMATCH) && + (match != BBR_RTT_BY_TIMESTAMP)){ + /* + * We only do measurements in google mode + * with bbr_no_retran on for sure things. + */ + return; + } + /* Only update srtt if we know by exact match */ + tcp_bbr_xmit_timer(bbr, rtt, rsm_send_time, rsm->r_start, tsin); + if (ack_type == BBR_CUM_ACKED) + bbr->rc_ack_is_cumack = 1; + else + bbr->rc_ack_is_cumack = 0; + old_rttprop = bbr_get_rtt(bbr, BBR_RTT_PROP); + /* + * Note the following code differs to the original + * BBR spec. It calls for <= not <. However after a + * long discussion in email with Neal, he acknowledged + * that it should be < than so that we will have flows + * going into probe-rtt (we were seeing cases where that + * did not happen and caused ugly things to occur). We + * have added this agreed upon fix to our code base. + */ + if (rtt < old_rttprop) { + /* Update when we last saw a rtt drop */ + bbr_log_rtt_shrinks(bbr, cts, 0, rtt, __LINE__, BBR_RTTS_NEWRTT, 0); + bbr_set_reduced_rtt(bbr, cts, __LINE__); + } + bbr_log_type_bbrrttprop(bbr, rtt, (rsm ? rsm->r_end : 0), uts, cts, + match, rsm->r_start, rsm->r_flags); + apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); + if (old_rttprop != bbr_get_rtt(bbr, BBR_RTT_PROP)) { + /* + * The RTT-prop moved, reset the target (may be a + * nop for some states). + */ + bbr_set_state_target(bbr, __LINE__); + if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) + bbr_log_rtt_shrinks(bbr, cts, 0, 0, + __LINE__, BBR_RTTS_NEW_TARGET, 0); + else if (old_rttprop < bbr_get_rtt(bbr, BBR_RTT_PROP)) + /* It went up */ + bbr_check_probe_rtt_limits(bbr, cts); + } + if ((bbr->rc_use_google == 0) && + (match == BBR_RTT_BY_TIMESTAMP)) { + /* + * We don't do b/w update with + * these since they are not really + * reliable. + */ + return; + } + if (bbr->r_ctl.r_app_limited_until && + (bbr->r_ctl.rc_delivered >= bbr->r_ctl.r_app_limited_until)) { + /* We are no longer app-limited */ + bbr->r_ctl.r_app_limited_until = 0; + } + if (bbr->rc_use_google) { + bbr_google_measurement(bbr, rsm, rtt, cts); + } else { + bbr_nf_measurement(bbr, rsm, rtt, cts); + } +} + +/* + * Convert a timestamp that the main stack + * uses (milliseconds) into one that bbr uses + * (microseconds). Return that converted timestamp. + */ +static uint32_t +bbr_ts_convert(uint32_t cts) { + uint32_t sec, msec; + + sec = cts / MS_IN_USEC; + msec = cts - (MS_IN_USEC * sec); + return ((sec * USECS_IN_SECOND) + (msec * MS_IN_USEC)); +} + +/* + * Return 0 if we did not update the RTT time, return + * 1 if we did. + */ +static int +bbr_update_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, + struct bbr_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type, uint32_t th_ack) +{ + int32_t i; + uint32_t t, uts = 0; + + if ((rsm->r_flags & BBR_ACKED) || + (rsm->r_flags & BBR_WAS_RENEGED) || + (rsm->r_flags & BBR_RXT_CLEARED)) { + /* Already done */ + return (0); + } + if (rsm->r_rtr_cnt == 1) { + /* + * Only one transmit. Hopefully the normal case. + */ + if (TSTMP_GT(cts, rsm->r_tim_lastsent[0])) + t = cts - rsm->r_tim_lastsent[0]; + else + t = 1; + if ((int)t <= 0) + t = 1; + bbr->r_ctl.rc_last_rtt = t; + bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0, + BBR_RTT_BY_EXACTMATCH, rsm->r_tim_lastsent[0], ack_type, to); + return (1); + } + /* Convert to usecs */ + if ((bbr_can_use_ts_for_rtt == 1) && + (bbr->rc_use_google == 1) && + (ack_type == BBR_CUM_ACKED) && + (to->to_flags & TOF_TS) && + (to->to_tsecr != 0)) { + + t = tcp_tv_to_mssectick(&bbr->rc_tv) - to->to_tsecr; + if (t < 1) + t = 1; + t *= MS_IN_USEC; + bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, 0, + BBR_RTT_BY_TIMESTAMP, + rsm->r_tim_lastsent[(rsm->r_rtr_cnt-1)], + ack_type, to); + return (1); + } + uts = bbr_ts_convert(to->to_tsecr); + if ((to->to_flags & TOF_TS) && + (to->to_tsecr != 0) && + (ack_type == BBR_CUM_ACKED) && + ((rsm->r_flags & BBR_OVERMAX) == 0)) { + /* + * Now which timestamp does it match? In this block the ACK + * may be coming from a previous transmission. + */ + uint32_t fudge; + + fudge = BBR_TIMER_FUDGE; + for (i = 0; i < rsm->r_rtr_cnt; i++) { + if ((SEQ_GEQ(uts, (rsm->r_tim_lastsent[i] - fudge))) && + (SEQ_LEQ(uts, (rsm->r_tim_lastsent[i] + fudge)))) { + if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) + t = cts - rsm->r_tim_lastsent[i]; + else + t = 1; + if ((int)t <= 0) + t = 1; + bbr->r_ctl.rc_last_rtt = t; + bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_TSMATCHING, + rsm->r_tim_lastsent[i], ack_type, to); + if ((i + 1) < rsm->r_rtr_cnt) { + /* Likely */ + bbr_earlier_retran(tp, bbr, rsm, t, cts, ack_type); + } else if (rsm->r_flags & BBR_TLP) { + bbr->rc_tlp_rtx_out = 0; + } + return (1); + } + } + /* Fall through if we can't find a matching timestamp */ + } + /* + * Ok its a SACK block that we retransmitted. or a windows + * machine without timestamps. We can tell nothing from the + * time-stamp since its not there or the time the peer last + * recieved a segment that moved forward its cum-ack point. + * + * Lets look at the last retransmit and see what we can tell + * (with BBR for space we only keep 2 note we have to keep + * at least 2 so the map can not be condensed more). + */ + i = rsm->r_rtr_cnt - 1; + if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) + t = cts - rsm->r_tim_lastsent[i]; + else + goto not_sure; + if (t < bbr->r_ctl.rc_lowest_rtt) { + /* + * We retransmitted and the ack came back in less + * than the smallest rtt we have observed in the + * windowed rtt. We most likey did an improper + * retransmit as outlined in 4.2 Step 3 point 2 in + * the rack-draft. + * + * Use the prior transmission to update all the + * information as long as there is only one prior + * transmission. + */ + if ((rsm->r_flags & BBR_OVERMAX) == 0) { +#ifdef BBR_INVARIANTS + if (rsm->r_rtr_cnt == 1) + panic("rsm:%p bbr:%p rsm has overmax and only 1 retranmit flags:%x?", rsm, bbr, rsm->r_flags); +#endif + i = rsm->r_rtr_cnt - 2; + if (TSTMP_GT(cts, rsm->r_tim_lastsent[i])) + t = cts - rsm->r_tim_lastsent[i]; + else + t = 1; + bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, BBR_RTT_BY_EARLIER_RET, + rsm->r_tim_lastsent[i], ack_type, to); + bbr_earlier_retran(tp, bbr, rsm, t, cts, ack_type); + } else { + /* + * Too many prior transmissions, just + * updated BBR delivered + */ +not_sure: + bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts, + BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to); + } + } else { + /* + * We retransmitted it and the retransmit did the + * job. + */ + if (rsm->r_flags & BBR_TLP) + bbr->rc_tlp_rtx_out = 0; + if ((rsm->r_flags & BBR_OVERMAX) == 0) + bbr_update_bbr_info(bbr, rsm, t, cts, to->to_tsecr, uts, + BBR_RTT_BY_THIS_RETRAN, 0, ack_type, to); + else + bbr_update_bbr_info(bbr, rsm, 0, cts, to->to_tsecr, uts, + BBR_RTT_BY_SOME_RETRAN, 0, ack_type, to); + return (1); + } + return (0); +} + +/* + * Mark the SACK_PASSED flag on all entries prior to rsm send wise. + */ +static void +bbr_log_sack_passed(struct tcpcb *tp, + struct tcp_bbr *bbr, struct bbr_sendmap *rsm) +{ + struct bbr_sendmap *nrsm; + + nrsm = rsm; + TAILQ_FOREACH_REVERSE_FROM(nrsm, &bbr->r_ctl.rc_tmap, + bbr_head, r_tnext) { + if (nrsm == rsm) { + /* Skip orginal segment he is acked */ + continue; + } + if (nrsm->r_flags & BBR_ACKED) { + /* Skip ack'd segments */ + continue; + } + if (nrsm->r_flags & BBR_SACK_PASSED) { + /* + * We found one that is already marked + * passed, we have been here before and + * so all others below this are marked. + */ + break; + } + BBR_STAT_INC(bbr_sack_passed); + nrsm->r_flags |= BBR_SACK_PASSED; + if (((nrsm->r_flags & BBR_MARKED_LOST) == 0) && + bbr_is_lost(bbr, nrsm, bbr->r_ctl.rc_rcvtime)) { + bbr->r_ctl.rc_lost += nrsm->r_end - nrsm->r_start; + bbr->r_ctl.rc_lost_bytes += nrsm->r_end - nrsm->r_start; + nrsm->r_flags |= BBR_MARKED_LOST; + } + nrsm->r_flags &= ~BBR_WAS_SACKPASS; + } +} + +/* + * Returns the number of bytes that were + * newly ack'd by sack blocks. + */ +static uint32_t +bbr_proc_sack_blk(struct tcpcb *tp, struct tcp_bbr *bbr, struct sackblk *sack, + struct tcpopt *to, struct bbr_sendmap **prsm, uint32_t cts) +{ + int32_t times = 0; + uint32_t start, end, maxseg, changed = 0; + struct bbr_sendmap *rsm, *nrsm; + int32_t used_ref = 1; + uint8_t went_back = 0, went_fwd = 0; + + maxseg = tp->t_maxseg - bbr->rc_last_options; + start = sack->start; + end = sack->end; + rsm = *prsm; + if (rsm == NULL) + used_ref = 0; + + /* Do we locate the block behind where we last were? */ + if (rsm && SEQ_LT(start, rsm->r_start)) { + went_back = 1; + TAILQ_FOREACH_REVERSE_FROM(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { + if (SEQ_GEQ(start, rsm->r_start) && + SEQ_LT(start, rsm->r_end)) { + goto do_rest_ofb; + } + } + } +start_at_beginning: + went_fwd = 1; + /* + * Ok lets locate the block where this guy is fwd from rsm (if its + * set) + */ + TAILQ_FOREACH_FROM(rsm, &bbr->r_ctl.rc_map, r_next) { + if (SEQ_GEQ(start, rsm->r_start) && + SEQ_LT(start, rsm->r_end)) { + break; + } + } +do_rest_ofb: + if (rsm == NULL) { + /* + * This happens when we get duplicate sack blocks with the + * same end. For example SACK 4: 100 SACK 3: 100 The sort + * will not change there location so we would just start at + * the end of the first one and get lost. + */ + if (tp->t_flags & TF_SENTFIN) { + /* + * Check to see if we have not logged the FIN that + * went out. + */ + nrsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); + if (nrsm && (nrsm->r_end + 1) == tp->snd_max) { + /* + * Ok we did not get the FIN logged. + */ + nrsm->r_end++; + rsm = nrsm; + goto do_rest_ofb; + } + } + if (times == 1) { +#ifdef BBR_INVARIANTS + panic("tp:%p bbr:%p sack:%p to:%p prsm:%p", + tp, bbr, sack, to, prsm); +#else + goto out; +#endif + } + times++; + BBR_STAT_INC(bbr_sack_proc_restart); + rsm = NULL; + goto start_at_beginning; + } + /* Ok we have an ACK for some piece of rsm */ + if (rsm->r_start != start) { + /* + * Need to split this in two pieces the before and after. + */ + if (bbr_sack_mergable(rsm, start, end)) + nrsm = bbr_alloc_full_limit(bbr); + else + nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); + if (nrsm == NULL) { + /* We could not allocate ignore the sack */ + struct sackblk blk; + + blk.start = start; + blk.end = end; + sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk); + goto out; + } + bbr_clone_rsm(bbr, nrsm, rsm, start); + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + rsm->r_flags &= (~BBR_HAS_FIN); + rsm = nrsm; + } + if (SEQ_GEQ(end, rsm->r_end)) { + /* + * The end of this block is either beyond this guy or right + * at this guy. + */ + if ((rsm->r_flags & BBR_ACKED) == 0) { + bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0); + changed += (rsm->r_end - rsm->r_start); + bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); + bbr_log_sack_passed(tp, bbr, rsm); + if (rsm->r_flags & BBR_MARKED_LOST) { + bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; + } + /* Is Reordering occuring? */ + if (rsm->r_flags & BBR_SACK_PASSED) { + BBR_STAT_INC(bbr_reorder_seen); + bbr->r_ctl.rc_reorder_ts = cts; + if (rsm->r_flags & BBR_MARKED_LOST) { + bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; + if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) + /* LT sampling also needs adjustment */ + bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; + } + } + rsm->r_flags |= BBR_ACKED; + rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST); + if (rsm->r_in_tmap) { + TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 0; + } + } + bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED); + if (end == rsm->r_end) { + /* This block only - done */ + goto out; + } + /* There is more not coverend by this rsm move on */ + start = rsm->r_end; + nrsm = TAILQ_NEXT(rsm, r_next); + rsm = nrsm; + times = 0; + goto do_rest_ofb; + } + if (rsm->r_flags & BBR_ACKED) { + /* Been here done that */ + goto out; + } + /* Ok we need to split off this one at the tail */ + if (bbr_sack_mergable(rsm, start, end)) + nrsm = bbr_alloc_full_limit(bbr); + else + nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); + if (nrsm == NULL) { + /* failed XXXrrs what can we do but loose the sack info? */ + struct sackblk blk; + + blk.start = start; + blk.end = end; + sack_filter_reject(&bbr->r_ctl.bbr_sf, &blk); + goto out; + } + /* Clone it */ + bbr_clone_rsm(bbr, nrsm, rsm, end); + /* The sack block does not cover this guy fully */ + rsm->r_flags &= (~BBR_HAS_FIN); + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + nrsm->r_dupack = 0; + bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_SACKED, 0); + bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_SACKED); + changed += (rsm->r_end - rsm->r_start); + bbr->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); + bbr_log_sack_passed(tp, bbr, rsm); + /* Is Reordering occuring? */ + if (rsm->r_flags & BBR_MARKED_LOST) { + bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; + } + if (rsm->r_flags & BBR_SACK_PASSED) { + BBR_STAT_INC(bbr_reorder_seen); + bbr->r_ctl.rc_reorder_ts = cts; + if (rsm->r_flags & BBR_MARKED_LOST) { + bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; + if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) + /* LT sampling also needs adjustment */ + bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; + } + } + rsm->r_flags &= ~(BBR_TLP|BBR_WAS_RENEGED|BBR_RXT_CLEARED|BBR_MARKED_LOST); + rsm->r_flags |= BBR_ACKED; + if (rsm->r_in_tmap) { + TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 0; + } +out: + if (rsm && (rsm->r_flags & BBR_ACKED)) { + /* + * Now can we merge this newly acked + * block with either the previous or + * next block? + */ + nrsm = TAILQ_NEXT(rsm, r_next); + if (nrsm && + (nrsm->r_flags & BBR_ACKED)) { + /* yep this and next can be merged */ + rsm = bbr_merge_rsm(bbr, rsm, nrsm); + } + /* Now what about the previous? */ + nrsm = TAILQ_PREV(rsm, bbr_head, r_next); + if (nrsm && + (nrsm->r_flags & BBR_ACKED)) { + /* yep the previous and this can be merged */ + rsm = bbr_merge_rsm(bbr, nrsm, rsm); + } + } + if (used_ref == 0) { + BBR_STAT_INC(bbr_sack_proc_all); + } else { + BBR_STAT_INC(bbr_sack_proc_short); + } + if (went_fwd && went_back) { + BBR_STAT_INC(bbr_sack_search_both); + } else if (went_fwd) { + BBR_STAT_INC(bbr_sack_search_fwd); + } else if (went_back) { + BBR_STAT_INC(bbr_sack_search_back); + } + /* Save off where the next seq is */ + if (rsm) + bbr->r_ctl.rc_sacklast = TAILQ_NEXT(rsm, r_next); + else + bbr->r_ctl.rc_sacklast = NULL; + *prsm = rsm; + return (changed); +} + + +static void inline +bbr_peer_reneges(struct tcp_bbr *bbr, struct bbr_sendmap *rsm, tcp_seq th_ack) +{ + struct bbr_sendmap *tmap; + + BBR_STAT_INC(bbr_reneges_seen); + tmap = NULL; + while (rsm && (rsm->r_flags & BBR_ACKED)) { + /* Its no longer sacked, mark it so */ + uint32_t oflags; + bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); +#ifdef BBR_INVARIANTS + if (rsm->r_in_tmap) { + panic("bbr:%p rsm:%p flags:0x%x in tmap?", + bbr, rsm, rsm->r_flags); + } +#endif + oflags = rsm->r_flags; + if (rsm->r_flags & BBR_MARKED_LOST) { + bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; + bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; + if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) + /* LT sampling also needs adjustment */ + bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; + } + rsm->r_flags &= ~(BBR_ACKED | BBR_SACK_PASSED | BBR_WAS_SACKPASS | BBR_MARKED_LOST); + rsm->r_flags |= BBR_WAS_RENEGED; + rsm->r_flags |= BBR_RXT_CLEARED; + bbr_log_type_rsmclear(bbr, bbr->r_ctl.rc_rcvtime, rsm, oflags, __LINE__); + /* Rebuild it into our tmap */ + if (tmap == NULL) { + TAILQ_INSERT_HEAD(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + tmap = rsm; + } else { + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, tmap, rsm, r_tnext); + tmap = rsm; + } + tmap->r_in_tmap = 1; + /* + * XXXrrs Delivered? Should we do anything here? + * + * Of course we don't on a rxt timeout so maybe its ok that + * we don't? + * + * For now lets not. + */ + rsm = TAILQ_NEXT(rsm, r_next); + } + /* + * Now lets possibly clear the sack filter so we start recognizing + * sacks that cover this area. + */ + sack_filter_clear(&bbr->r_ctl.bbr_sf, th_ack); +} + +static void +bbr_log_syn(struct tcpcb *tp, struct tcpopt *to) +{ + struct tcp_bbr *bbr; + struct bbr_sendmap *rsm; + uint32_t cts; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + cts = bbr->r_ctl.rc_rcvtime; + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + if (rsm && (rsm->r_flags & BBR_HAS_SYN)) { + if ((rsm->r_end - rsm->r_start) <= 1) { + /* Log out the SYN completely */ + bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; + rsm->r_rtr_bytes = 0; + TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); + if (rsm->r_in_tmap) { + TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 0; + } + if (bbr->r_ctl.rc_next == rsm) { + /* scoot along the marker */ + bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map); + } + if (to != NULL) + bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, 0); + bbr_free(bbr, rsm); + } else { + /* There is more (Fast open)? strip out SYN. */ + rsm->r_flags &= ~BBR_HAS_SYN; + rsm->r_start++; + } + } +} + +/* + * Returns the number of bytes that were + * acknowledged by SACK blocks. + */ + +static uint32_t +bbr_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th, + uint32_t *prev_acked) +{ + uint32_t changed, last_seq, entered_recovery = 0; + struct tcp_bbr *bbr; + struct bbr_sendmap *rsm; + struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1]; + register uint32_t th_ack; + int32_t i, j, k, new_sb, num_sack_blks = 0; + uint32_t cts, acked, ack_point, sack_changed = 0; + uint32_t p_maxseg, maxseg, p_acked = 0; + + INP_WLOCK_ASSERT(tp->t_inpcb); + if (th->th_flags & TH_RST) { + /* We don't log resets */ + return (0); + } + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + cts = bbr->r_ctl.rc_rcvtime; + + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + changed = 0; + maxseg = tp->t_maxseg - bbr->rc_last_options; + p_maxseg = min(bbr->r_ctl.rc_pace_max_segs, maxseg); + th_ack = th->th_ack; + if (SEQ_GT(th_ack, tp->snd_una)) { + acked = th_ack - tp->snd_una; + bbr_log_progress_event(bbr, tp, ticks, PROGRESS_UPDATE, __LINE__); + bbr->rc_tp->t_acktime = ticks; + } else + acked = 0; + if (SEQ_LEQ(th_ack, tp->snd_una)) { + /* Only sent here for sack processing */ + goto proc_sack; + } + if (rsm && SEQ_GT(th_ack, rsm->r_start)) { + changed = th_ack - rsm->r_start; + } else if ((rsm == NULL) && ((th_ack - 1) == tp->iss)) { + /* + * For the SYN incoming case we will not have called + * tcp_output for the sending of the SYN, so there will be + * no map. All other cases should probably be a panic. + */ + if ((to->to_flags & TOF_TS) && (to->to_tsecr != 0)) { + /* + * We have a timestamp that can be used to generate + * an initial RTT. + */ + uint32_t ts, now, rtt; + + ts = bbr_ts_convert(to->to_tsecr); + now = bbr_ts_convert(tcp_tv_to_mssectick(&bbr->rc_tv)); + rtt = now - ts; + if (rtt < 1) + rtt = 1; + bbr_log_type_bbrrttprop(bbr, rtt, + tp->iss, 0, cts, + BBR_RTT_BY_TIMESTAMP, tp->iss, 0); + apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); + changed = 1; + bbr->r_wanted_output = 1; + goto out; + } + goto proc_sack; + } else if (rsm == NULL) { + goto out; + } + if (changed) { + /* + * The ACK point is advancing to th_ack, we must drop off + * the packets in the rack log and calculate any eligble + * RTT's. + */ + bbr->r_wanted_output = 1; +more: + if (rsm == NULL) { + + if (tp->t_flags & TF_SENTFIN) { + /* if we send a FIN we will not hav a map */ + goto proc_sack; + } +#ifdef BBR_INVARIANTS + panic("No rack map tp:%p for th:%p state:%d bbr:%p snd_una:%u snd_max:%u chg:%d\n", + tp, + th, tp->t_state, bbr, + tp->snd_una, tp->snd_max, changed); +#endif + goto proc_sack; + } + } + if (SEQ_LT(th_ack, rsm->r_start)) { + /* Huh map is missing this */ +#ifdef BBR_INVARIANTS + printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d bbr:%p\n", + rsm->r_start, + th_ack, tp->t_state, + bbr->r_state, bbr); + panic("th-ack is bad bbr:%p tp:%p", bbr, tp); +#endif + goto proc_sack; + } else if (th_ack == rsm->r_start) { + /* None here to ack */ + goto proc_sack; + } + /* + * Clear the dup ack counter, it will + * either be freed or if there is some + * remaining we need to start it at zero. + */ + rsm->r_dupack = 0; + /* Now do we consume the whole thing? */ + if (SEQ_GEQ(th_ack, rsm->r_end)) { + /* Its all consumed. */ + uint32_t left; + + if (rsm->r_flags & BBR_ACKED) { + /* + * It was acked on the scoreboard -- remove it from + * total + */ + p_acked += (rsm->r_end - rsm->r_start); + bbr->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); + if (bbr->r_ctl.rc_sacked == 0) + bbr->r_ctl.rc_sacklast = NULL; + } else { + bbr_update_rtt(tp, bbr, rsm, to, cts, BBR_CUM_ACKED, th_ack); + if (rsm->r_flags & BBR_MARKED_LOST) { + bbr->r_ctl.rc_lost_bytes -= rsm->r_end - rsm->r_start; + } + if (rsm->r_flags & BBR_SACK_PASSED) { + /* + * There are acked segments ACKED on the + * scoreboard further up. We are seeing + * reordering. + */ + BBR_STAT_INC(bbr_reorder_seen); + bbr->r_ctl.rc_reorder_ts = cts; + if (rsm->r_flags & BBR_MARKED_LOST) { + bbr->r_ctl.rc_lost -= rsm->r_end - rsm->r_start; + if (SEQ_GT(bbr->r_ctl.rc_lt_lost, bbr->r_ctl.rc_lost)) + /* LT sampling also needs adjustment */ + bbr->r_ctl.rc_lt_lost = bbr->r_ctl.rc_lost; + } + } + rsm->r_flags &= ~BBR_MARKED_LOST; + } + bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; + rsm->r_rtr_bytes = 0; + TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); + if (rsm->r_in_tmap) { + TAILQ_REMOVE(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 0; + } + if (bbr->r_ctl.rc_next == rsm) { + /* scoot along the marker */ + bbr->r_ctl.rc_next = TAILQ_FIRST(&bbr->r_ctl.rc_map); + } + bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED); + /* Adjust the packet counts */ + left = th_ack - rsm->r_end; + /* Free back to zone */ + bbr_free(bbr, rsm); + if (left) { + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + goto more; + } + goto proc_sack; + } + if (rsm->r_flags & BBR_ACKED) { + /* + * It was acked on the scoreboard -- remove it from total + * for the part being cum-acked. + */ + p_acked += (rsm->r_end - rsm->r_start); + bbr->r_ctl.rc_sacked -= (th_ack - rsm->r_start); + if (bbr->r_ctl.rc_sacked == 0) + bbr->r_ctl.rc_sacklast = NULL; + } else { + /* + * It was acked up to th_ack point for the first time + */ + struct bbr_sendmap lrsm; + + memcpy(&lrsm, rsm, sizeof(struct bbr_sendmap)); + lrsm.r_end = th_ack; + bbr_update_rtt(tp, bbr, &lrsm, to, cts, BBR_CUM_ACKED, th_ack); + } + if ((rsm->r_flags & BBR_MARKED_LOST) && + ((rsm->r_flags & BBR_ACKED) == 0)) { + /* + * It was marked lost and partly ack'd now + * for the first time. We lower the rc_lost_bytes + * and still leave it MARKED. + */ + bbr->r_ctl.rc_lost_bytes -= th_ack - rsm->r_start; + } + bbr_isit_a_pkt_epoch(bbr, cts, rsm, __LINE__, BBR_CUM_ACKED); + bbr->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; + rsm->r_rtr_bytes = 0; + /* adjust packet count */ + rsm->r_start = th_ack; +proc_sack: + /* Check for reneging */ + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + if (rsm && (rsm->r_flags & BBR_ACKED) && (th_ack == rsm->r_start)) { + /* + * The peer has moved snd_una up to the edge of this send, + * i.e. one that it had previously acked. The only way that + * can be true if the peer threw away data (space issues) + * that it had previously sacked (else it would have given + * us snd_una up to (rsm->r_end). We need to undo the acked + * markings here. + * + * Note we have to look to make sure th_ack is our + * rsm->r_start in case we get an old ack where th_ack is + * behind snd_una. + */ + bbr_peer_reneges(bbr, rsm, th->th_ack); + } + if ((to->to_flags & TOF_SACK) == 0) { + /* We are done nothing left to log */ + goto out; + } + rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_map, bbr_sendmap, r_next); + if (rsm) { + last_seq = rsm->r_end; + } else { + last_seq = tp->snd_max; + } + /* Sack block processing */ + if (SEQ_GT(th_ack, tp->snd_una)) + ack_point = th_ack; + else + ack_point = tp->snd_una; + for (i = 0; i < to->to_nsacks; i++) { + bcopy((to->to_sacks + i * TCPOLEN_SACK), + &sack, sizeof(sack)); + sack.start = ntohl(sack.start); + sack.end = ntohl(sack.end); + if (SEQ_GT(sack.end, sack.start) && + SEQ_GT(sack.start, ack_point) && + SEQ_LT(sack.start, tp->snd_max) && + SEQ_GT(sack.end, ack_point) && + SEQ_LEQ(sack.end, tp->snd_max)) { + if ((bbr->r_ctl.rc_num_small_maps_alloced > bbr_sack_block_limit) && + (SEQ_LT(sack.end, last_seq)) && + ((sack.end - sack.start) < (p_maxseg / 8))) { + /* + * Not the last piece and its smaller than + * 1/8th of a p_maxseg. We ignore this. + */ + BBR_STAT_INC(bbr_runt_sacks); + continue; + } + sack_blocks[num_sack_blks] = sack; + num_sack_blks++; +#ifdef NETFLIX_STATS + } else if (SEQ_LEQ(sack.start, th_ack) && + SEQ_LEQ(sack.end, th_ack)) { + /* + * Its a D-SACK block. + */ + tcp_record_dsack(sack.start, sack.end); +#endif + } + } + if (num_sack_blks == 0) + goto out; + /* + * Sort the SACK blocks so we can update the rack scoreboard with + * just one pass. + */ + new_sb = sack_filter_blks(&bbr->r_ctl.bbr_sf, sack_blocks, + num_sack_blks, th->th_ack); + ctf_log_sack_filter(bbr->rc_tp, new_sb, sack_blocks); + BBR_STAT_ADD(bbr_sack_blocks, num_sack_blks); + BBR_STAT_ADD(bbr_sack_blocks_skip, (num_sack_blks - new_sb)); + num_sack_blks = new_sb; + if (num_sack_blks < 2) { + goto do_sack_work; + } + /* Sort the sacks */ + for (i = 0; i < num_sack_blks; i++) { + for (j = i + 1; j < num_sack_blks; j++) { + if (SEQ_GT(sack_blocks[i].end, sack_blocks[j].end)) { + sack = sack_blocks[i]; + sack_blocks[i] = sack_blocks[j]; + sack_blocks[j] = sack; + } + } + } + /* + * Now are any of the sack block ends the same (yes some + * implememtations send these)? + */ +again: + if (num_sack_blks > 1) { + for (i = 0; i < num_sack_blks; i++) { + for (j = i + 1; j < num_sack_blks; j++) { + if (sack_blocks[i].end == sack_blocks[j].end) { + /* + * Ok these two have the same end we + * want the smallest end and then + * throw away the larger and start + * again. + */ + if (SEQ_LT(sack_blocks[j].start, sack_blocks[i].start)) { + /* + * The second block covers + * more area use that + */ + sack_blocks[i].start = sack_blocks[j].start; + } + /* + * Now collapse out the dup-sack and + * lower the count + */ + for (k = (j + 1); k < num_sack_blks; k++) { + sack_blocks[j].start = sack_blocks[k].start; + sack_blocks[j].end = sack_blocks[k].end; + j++; + } + num_sack_blks--; + goto again; + } + } + } + } +do_sack_work: + rsm = bbr->r_ctl.rc_sacklast; + for (i = 0; i < num_sack_blks; i++) { + acked = bbr_proc_sack_blk(tp, bbr, &sack_blocks[i], to, &rsm, cts); + if (acked) { + bbr->r_wanted_output = 1; + changed += acked; + sack_changed += acked; + } + } +out: + *prev_acked = p_acked; + if ((sack_changed) && (!IN_RECOVERY(tp->t_flags))) { + /* + * Ok we have a high probability that we need to go in to + * recovery since we have data sack'd + */ + struct bbr_sendmap *rsm; + + rsm = bbr_check_recovery_mode(tp, bbr, cts); + if (rsm) { + /* Enter recovery */ + entered_recovery = 1; + bbr->r_wanted_output = 1; + /* + * When we enter recovery we need to assure we send + * one packet. + */ + if (bbr->r_ctl.rc_resend == NULL) { + bbr->r_ctl.rc_resend = rsm; + } + } + } + if (IN_RECOVERY(tp->t_flags) && (entered_recovery == 0)) { + /* + * See if we need to rack-retransmit anything if so set it + * up as the thing to resend assuming something else is not + * already in that position. + */ + if (bbr->r_ctl.rc_resend == NULL) { + bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); + } + } + /* + * We return the amount that changed via sack, this is used by the + * ack-received code to augment what was changed between th_ack <-> + * snd_una. + */ + return (sack_changed); +} + +static void +bbr_strike_dupack(struct tcp_bbr *bbr) +{ + struct bbr_sendmap *rsm; + + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_tmap); + if (rsm && (rsm->r_dupack < 0xff)) { + rsm->r_dupack++; + if (rsm->r_dupack >= DUP_ACK_THRESHOLD) + bbr->r_wanted_output = 1; + } +} + +/* + * Return value of 1, we do not need to call bbr_process_data(). + * return value of 0, bbr_process_data can be called. + * For ret_val if its 0 the TCB is locked and valid, if its non-zero + * its unlocked and probably unsafe to touch the TCB. + */ +static int +bbr_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, + uint32_t tiwin, int32_t tlen, + int32_t * ofia, int32_t thflags, int32_t * ret_val) +{ + int32_t ourfinisacked = 0; + int32_t acked_amount; + uint16_t nsegs; + int32_t acked; + uint32_t lost, sack_changed = 0; + struct mbuf *mfree; + struct tcp_bbr *bbr; + uint32_t prev_acked = 0; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + lost = bbr->r_ctl.rc_lost; + nsegs = max(1, m->m_pkthdr.lro_nsegs); + if (SEQ_GT(th->th_ack, tp->snd_max)) { + ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val); + bbr->r_wanted_output = 1; + return (1); + } + if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) { + /* Process the ack */ + if (bbr->rc_in_persist) + tp->t_rxtshift = 0; + if ((th->th_ack == tp->snd_una) && (tiwin == tp->snd_wnd)) + bbr_strike_dupack(bbr); + sack_changed = bbr_log_ack(tp, to, th, &prev_acked); + } + bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, (bbr->r_ctl.rc_lost > lost)); + if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { + /* + * Old ack, behind the last one rcv'd or a duplicate ack + * with SACK info. + */ + if (th->th_ack == tp->snd_una) { + bbr_ack_received(tp, bbr, th, 0, sack_changed, prev_acked, __LINE__, 0); + if (bbr->r_state == TCPS_SYN_SENT) { + /* + * Special case on where we sent SYN. When + * the SYN-ACK is processed in syn_sent + * state it bumps the snd_una. This causes + * us to hit here even though we did ack 1 + * byte. + * + * Go through the nothing left case so we + * send data. + */ + goto nothing_left; + } + } + return (0); + } + /* + * If we reach this point, ACK is not a duplicate, i.e., it ACKs + * something we sent. + */ + if (tp->t_flags & TF_NEEDSYN) { + /* + * T/TCP: Connection was half-synchronized, and our SYN has + * been ACK'd (so connection is now fully synchronized). Go + * to non-starred state, increment snd_una for ACK of SYN, + * and check if we can do window scaling. + */ + tp->t_flags &= ~TF_NEEDSYN; + tp->snd_una++; + /* Do window scaling? */ + if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == + (TF_RCVD_SCALE | TF_REQ_SCALE)) { + tp->rcv_scale = tp->request_r_scale; + /* Send window already scaled. */ + } + } + INP_WLOCK_ASSERT(tp->t_inpcb); + + acked = BYTES_THIS_ACK(tp, th); + TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs); + TCPSTAT_ADD(tcps_rcvackbyte, acked); + + /* + * If we just performed our first retransmit, and the ACK arrives + * within our recovery window, then it was a mistake to do the + * retransmit in the first place. Recover our original cwnd and + * ssthresh, and proceed to transmit where we left off. + */ + if (tp->t_flags & TF_PREVVALID) { + tp->t_flags &= ~TF_PREVVALID; + if (tp->t_rxtshift == 1 && + (int)(ticks - tp->t_badrxtwin) < 0) + bbr_cong_signal(tp, th, CC_RTO_ERR, NULL); + } + SOCKBUF_LOCK(&so->so_snd); + acked_amount = min(acked, (int)sbavail(&so->so_snd)); + tp->snd_wnd -= acked_amount; + mfree = sbcut_locked(&so->so_snd, acked_amount); + /* NB: sowwakeup_locked() does an implicit unlock. */ + sowwakeup_locked(so); + m_freem(mfree); + if (SEQ_GT(th->th_ack, tp->snd_una)) { + bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp)); + } + tp->snd_una = th->th_ack; + bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, (bbr->r_ctl.rc_lost - lost)); + if (IN_RECOVERY(tp->t_flags)) { + if (SEQ_LT(th->th_ack, tp->snd_recover) && + (SEQ_LT(th->th_ack, tp->snd_max))) { + tcp_bbr_partialack(tp); + } else { + bbr_post_recovery(tp); + } + } + if (SEQ_GT(tp->snd_una, tp->snd_recover)) { + tp->snd_recover = tp->snd_una; + } + if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { + tp->snd_nxt = tp->snd_max; + } + if (tp->snd_una == tp->snd_max) { + /* Nothing left outstanding */ +nothing_left: + bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__); + if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) + bbr->rc_tp->t_acktime = 0; + if ((sbused(&so->so_snd) == 0) && + (tp->t_flags & TF_SENTFIN)) { + ourfinisacked = 1; + } + bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); + if (bbr->rc_in_persist == 0) { + bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime; + } + sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); + bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime); + /* + * We invalidate the last ack here since we + * don't want to transfer forward the time + * for our sum's calculations. + */ + if ((tp->t_state >= TCPS_FIN_WAIT_1) && + (sbavail(&so->so_snd) == 0) && + (tp->t_flags2 & TF2_DROP_AF_DATA)) { + /* + * The socket was gone and the peer sent data, time + * to reset him. + */ + *ret_val = 1; + tp = tcp_close(tp); + ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen); + BBR_STAT_INC(bbr_dropped_af_data); + return (1); + } + /* Set need output so persist might get set */ + bbr->r_wanted_output = 1; + } + if (ofia) + *ofia = ourfinisacked; + return (0); +} + +static void +bbr_enter_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line) +{ + if (bbr->rc_in_persist == 0) { + bbr_timer_cancel(bbr, __LINE__, cts); + bbr->r_ctl.rc_last_delay_val = 0; + tp->t_rxtshift = 0; + bbr->rc_in_persist = 1; + bbr->r_ctl.rc_went_idle_time = cts; + /* We should be capped when rw went to 0 but just in case */ + bbr_log_type_pesist(bbr, cts, 0, line, 1); + /* Time freezes for the state, so do the accounting now */ + if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { + uint32_t time_in; + + time_in = cts - bbr->r_ctl.rc_bbr_state_time; + if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { + int32_t idx; + + idx = bbr_state_val(bbr); + counter_u64_add(bbr_state_time[(idx + 5)], time_in); + } else { + counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); + } + } + bbr->r_ctl.rc_bbr_state_time = cts; + } +} + +static void +bbr_restart_after_idle(struct tcp_bbr *bbr, uint32_t cts, uint32_t idle_time) +{ + /* + * Note that if idle time does not exceed our + * threshold, we do nothing continuing the state + * transitions we were last walking through. + */ + if (idle_time >= bbr_idle_restart_threshold) { + if (bbr->rc_use_idle_restart) { + bbr->rc_bbr_state = BBR_STATE_IDLE_EXIT; + /* + * Set our target using BBR_UNIT, so + * we increase at a dramatic rate but + * we stop when we get the pipe + * full again for our current b/w estimate. + */ + bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; + bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; + bbr_set_state_target(bbr, __LINE__); + /* Now setup our gains to ramp up */ + bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; + bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; + bbr_log_type_statechange(bbr, cts, __LINE__); + } else { + bbr_substate_change(bbr, cts, __LINE__, 1); + } + } +} + +static void +bbr_exit_persist(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts, int32_t line) +{ + uint32_t idle_time; + + if (bbr->rc_in_persist == 0) + return; + idle_time = bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time); + bbr->rc_in_persist = 0; + bbr->rc_hit_state_1 = 0; + tp->t_flags &= ~TF_FORCEDATA; + bbr->r_ctl.rc_del_time = cts; + /* + * We invalidate the last ack here since we + * don't want to transfer forward the time + * for our sum's calculations. + */ + if (bbr->rc_inp->inp_in_hpts) { + tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); + bbr->rc_timer_first = 0; + bbr->r_ctl.rc_hpts_flags = 0; + bbr->r_ctl.rc_last_delay_val = 0; + bbr->r_ctl.rc_hptsi_agg_delay = 0; + bbr->r_agg_early_set = 0; + bbr->r_ctl.rc_agg_early = 0; + } + bbr_log_type_pesist(bbr, cts, idle_time, line, 0); + if (idle_time >= bbr_rtt_probe_time) { + /* + * This qualifies as a RTT_PROBE session since we drop the + * data outstanding to nothing and waited more than + * bbr_rtt_probe_time. + */ + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_PERSIST, 0); + bbr->r_ctl.last_in_probertt = bbr->r_ctl.rc_rtt_shrinks = cts; + } + tp->t_rxtshift = 0; + /* + * If in probeBW and we have persisted more than an RTT lets do + * special handling. + */ + /* Force a time based epoch */ + bbr_set_epoch(bbr, cts, __LINE__); + /* + * Setup the lost so we don't count anything against the guy + * we have been stuck with during persists. + */ + bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; + /* Time un-freezes for the state */ + bbr->r_ctl.rc_bbr_state_time = cts; + if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) || + (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT)) { + /* + * If we are going back to probe-bw + * or probe_rtt, we may need to possibly + * do a fast restart. + */ + bbr_restart_after_idle(bbr, cts, idle_time); + } +} + +static void +bbr_collapsed_window(struct tcp_bbr *bbr) +{ + /* + * Now we must walk the + * send map and divide the + * ones left stranded. These + * guys can't cause us to abort + * the connection and are really + * "unsent". However if a buggy + * client actually did keep some + * of the data i.e. collapsed the win + * and refused to ack and then opened + * the win and acked that data. We would + * get into an ack war, the simplier + * method then of just pretending we + * did not send those segments something + * won't work. + */ + struct bbr_sendmap *rsm, *nrsm; + tcp_seq max_seq; + uint32_t maxseg; + int can_split = 0; + int fnd = 0; + + maxseg = bbr->rc_tp->t_maxseg - bbr->rc_last_options; + max_seq = bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd; + bbr_log_type_rwnd_collapse(bbr, max_seq, 1, 0); + TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { + /* Find the first seq past or at maxseq */ + if (rsm->r_flags & BBR_RWND_COLLAPSED) + rsm->r_flags &= ~BBR_RWND_COLLAPSED; + if (SEQ_GEQ(max_seq, rsm->r_start) && + SEQ_GEQ(rsm->r_end, max_seq)) { + fnd = 1; + break; + } + } + bbr->rc_has_collapsed = 0; + if (!fnd) { + /* Nothing to do strange */ + return; + } + /* + * Now can we split? + * + * We don't want to split if splitting + * would generate too many small segments + * less we let an attacker fragment our + * send_map and leave us out of memory. + */ + if ((max_seq != rsm->r_start) && + (max_seq != rsm->r_end)){ + /* can we split? */ + int res1, res2; + + res1 = max_seq - rsm->r_start; + res2 = rsm->r_end - max_seq; + if ((res1 >= (maxseg/8)) && + (res2 >= (maxseg/8))) { + /* No small pieces here */ + can_split = 1; + } else if (bbr->r_ctl.rc_num_small_maps_alloced < bbr_sack_block_limit) { + /* We are under the limit */ + can_split = 1; + } + } + /* Ok do we need to split this rsm? */ + if (max_seq == rsm->r_start) { + /* It's this guy no split required */ + nrsm = rsm; + } else if (max_seq == rsm->r_end) { + /* It's the next one no split required. */ + nrsm = TAILQ_NEXT(rsm, r_next); + if (nrsm == NULL) { + /* Huh? */ + return; + } + } else if (can_split && SEQ_LT(max_seq, rsm->r_end)) { + /* yep we need to split it */ + nrsm = bbr_alloc_limit(bbr, BBR_LIMIT_TYPE_SPLIT); + if (nrsm == NULL) { + /* failed XXXrrs what can we do mark the whole? */ + nrsm = rsm; + goto no_split; + } + /* Clone it */ + bbr_log_type_rwnd_collapse(bbr, max_seq, 3, 0); + bbr_clone_rsm(bbr, nrsm, rsm, max_seq); + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_map, rsm, nrsm, r_next); + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&bbr->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + } else { + /* + * Split not allowed just start here just + * use this guy. + */ + nrsm = rsm; + } +no_split: + BBR_STAT_INC(bbr_collapsed_win); + /* reuse fnd as a count */ + fnd = 0; + TAILQ_FOREACH_FROM(nrsm, &bbr->r_ctl.rc_map, r_next) { + nrsm->r_flags |= BBR_RWND_COLLAPSED; + fnd++; + bbr->rc_has_collapsed = 1; + } + bbr_log_type_rwnd_collapse(bbr, max_seq, 4, fnd); +} + +static void +bbr_un_collapse_window(struct tcp_bbr *bbr) +{ + struct bbr_sendmap *rsm; + int cleared = 0; + + TAILQ_FOREACH_REVERSE(rsm, &bbr->r_ctl.rc_map, bbr_head, r_next) { + if (rsm->r_flags & BBR_RWND_COLLAPSED) { + /* Clear the flag */ + rsm->r_flags &= ~BBR_RWND_COLLAPSED; + cleared++; + } else + break; + } + bbr_log_type_rwnd_collapse(bbr, + (bbr->rc_tp->snd_una + bbr->rc_tp->snd_wnd), 0, cleared); + bbr->rc_has_collapsed = 0; +} + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + /* + * Update window information. Don't look at window if no ACK: TAC's + * send garbage on first SYN. + */ + uint16_t nsegs; + int32_t tfo_syn; + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + INP_WLOCK_ASSERT(tp->t_inpcb); + nsegs = max(1, m->m_pkthdr.lro_nsegs); + if ((thflags & TH_ACK) && + (SEQ_LT(tp->snd_wl1, th->th_seq) || + (tp->snd_wl1 == th->th_seq && (SEQ_LT(tp->snd_wl2, th->th_ack) || + (tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd))))) { + /* keep track of pure window updates */ + if (tlen == 0 && + tp->snd_wl2 == th->th_ack && tiwin > tp->snd_wnd) + TCPSTAT_INC(tcps_rcvwinupd); + tp->snd_wnd = tiwin; + tp->snd_wl1 = th->th_seq; + tp->snd_wl2 = th->th_ack; + if (tp->snd_wnd > tp->max_sndwnd) + tp->max_sndwnd = tp->snd_wnd; + bbr->r_wanted_output = 1; + } else if (thflags & TH_ACK) { + if ((tp->snd_wl2 == th->th_ack) && (tiwin < tp->snd_wnd)) { + tp->snd_wnd = tiwin; + tp->snd_wl1 = th->th_seq; + tp->snd_wl2 = th->th_ack; + } + } + if (tp->snd_wnd < ctf_outstanding(tp)) + /* The peer collapsed its window on us */ + bbr_collapsed_window(bbr); + else if (bbr->rc_has_collapsed) + bbr_un_collapse_window(bbr); + /* Was persist timer active and now we have window space? */ + if ((bbr->rc_in_persist != 0) && + (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), + bbr_minseg(bbr)))) { + /* + * Make the rate persist at end of persist mode if idle long + * enough + */ + bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); + + /* Make sure we output to start the timer */ + bbr->r_wanted_output = 1; + } + /* Do we need to enter persist? */ + if ((bbr->rc_in_persist == 0) && + (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && + TCPS_HAVEESTABLISHED(tp->t_state) && + (tp->snd_max == tp->snd_una) && + sbavail(&tp->t_inpcb->inp_socket->so_snd) && + (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { + /* No send window.. we must enter persist */ + bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); + } + if (tp->t_flags2 & TF2_DROP_AF_DATA) { + m_freem(m); + return (0); + } + /* + * Process segments with URG. + */ + if ((thflags & TH_URG) && th->th_urp && + TCPS_HAVERCVDFIN(tp->t_state) == 0) { + /* + * This is a kludge, but if we receive and accept random + * urgent pointers, we'll crash in soreceive. It's hard to + * imagine someone actually wanting to send this much urgent + * data. + */ + SOCKBUF_LOCK(&so->so_rcv); + if (th->th_urp + sbavail(&so->so_rcv) > sb_max) { + th->th_urp = 0; /* XXX */ + thflags &= ~TH_URG; /* XXX */ + SOCKBUF_UNLOCK(&so->so_rcv); /* XXX */ + goto dodata; /* XXX */ + } + /* + * If this segment advances the known urgent pointer, then + * mark the data stream. This should not happen in + * CLOSE_WAIT, CLOSING, LAST_ACK or TIME_WAIT STATES since a + * FIN has been received from the remote side. In these + * states we ignore the URG. + * + * According to RFC961 (Assigned Protocols), the urgent + * pointer points to the last octet of urgent data. We + * continue, however, to consider it to indicate the first + * octet of data past the urgent section as the original + * spec states (in one of two places). + */ + if (SEQ_GT(th->th_seq + th->th_urp, tp->rcv_up)) { + tp->rcv_up = th->th_seq + th->th_urp; + so->so_oobmark = sbavail(&so->so_rcv) + + (tp->rcv_up - tp->rcv_nxt) - 1; + if (so->so_oobmark == 0) + so->so_rcv.sb_state |= SBS_RCVATMARK; + sohasoutofband(so); + tp->t_oobflags &= ~(TCPOOB_HAVEDATA | TCPOOB_HADDATA); + } + SOCKBUF_UNLOCK(&so->so_rcv); + /* + * Remove out of band data so doesn't get presented to user. + * This can happen independent of advancing the URG pointer, + * but if two URG's are pending at once, some out-of-band + * data may creep in... ick. + */ + if (th->th_urp <= (uint32_t)tlen && + !(so->so_options & SO_OOBINLINE)) { + /* hdr drop is delayed */ + tcp_pulloutofband(so, th, m, drop_hdrlen); + } + } else { + /* + * If no out of band data is expected, pull receive urgent + * pointer along with the receive window. + */ + if (SEQ_GT(tp->rcv_nxt, tp->rcv_up)) + tp->rcv_up = tp->rcv_nxt; + } +dodata: /* XXX */ + INP_WLOCK_ASSERT(tp->t_inpcb); + + /* + * Process the segment text, merging it into the TCP sequencing + * queue, and arranging for acknowledgment of receipt if necessary. + * This process logically involves adjusting tp->rcv_wnd as data is + * presented to the user (this happens in tcp_usrreq.c, case + * PRU_RCVD). If a FIN has already been received on this connection + * then we just ignore the text. + */ + tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) && + IS_FASTOPEN(tp->t_flags)); + if ((tlen || (thflags & TH_FIN) || tfo_syn) && + TCPS_HAVERCVDFIN(tp->t_state) == 0) { + tcp_seq save_start = th->th_seq; + tcp_seq save_rnxt = tp->rcv_nxt; + int save_tlen = tlen; + + m_adj(m, drop_hdrlen); /* delayed header drop */ + /* + * Insert segment which includes th into TCP reassembly + * queue with control block tp. Set thflags to whether + * reassembly now includes a segment with FIN. This handles + * the common case inline (segment is the next to be + * received on an established connection, and the queue is + * empty), avoiding linkage into and removal from the queue + * and repetition of various conversions. Set DELACK for + * segments received in order, but ack immediately when + * segments are out of order (so fast retransmit can work). + */ + if (th->th_seq == tp->rcv_nxt && + SEGQ_EMPTY(tp) && + (TCPS_HAVEESTABLISHED(tp->t_state) || + tfo_syn)) { +#ifdef NETFLIX_SB_LIMITS + u_int mcnt, appended; + + if (so->so_rcv.sb_shlim) { + mcnt = m_memcnt(m); + appended = 0; + if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, + CFO_NOSLEEP, NULL) == false) { + counter_u64_add(tcp_sb_shlim_fails, 1); + m_freem(m); + return (0); + } + } +#endif + if (DELAY_ACK(tp, bbr, nsegs) || tfo_syn) { + bbr->bbr_segs_rcvd += max(1, nsegs); + tp->t_flags |= TF_DELACK; + bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); + } else { + bbr->r_wanted_output = 1; + tp->t_flags |= TF_ACKNOW; + } + tp->rcv_nxt += tlen; + thflags = th->th_flags & TH_FIN; + TCPSTAT_ADD(tcps_rcvpack, (int)nsegs); + TCPSTAT_ADD(tcps_rcvbyte, tlen); + SOCKBUF_LOCK(&so->so_rcv); + if (so->so_rcv.sb_state & SBS_CANTRCVMORE) + m_freem(m); + else +#ifdef NETFLIX_SB_LIMITS + appended = +#endif + sbappendstream_locked(&so->so_rcv, m, 0); + /* NB: sorwakeup_locked() does an implicit unlock. */ + sorwakeup_locked(so); +#ifdef NETFLIX_SB_LIMITS + if (so->so_rcv.sb_shlim && appended != mcnt) + counter_fo_release(so->so_rcv.sb_shlim, + mcnt - appended); +#endif + } else { + /* + * XXX: Due to the header drop above "th" is + * theoretically invalid by now. Fortunately + * m_adj() doesn't actually frees any mbufs when + * trimming from the head. + */ + tcp_seq temp = save_start; + thflags = tcp_reass(tp, th, &temp, &tlen, m); + tp->t_flags |= TF_ACKNOW; + } + if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) { + if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { + /* + * DSACK actually handled in the fastpath + * above. + */ + tcp_update_sack_list(tp, save_start, + save_start + save_tlen); + } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { + if ((tp->rcv_numsacks >= 1) && + (tp->sackblks[0].end == save_start)) { + /* + * Partial overlap, recorded at todrop + * above. + */ + tcp_update_sack_list(tp, + tp->sackblks[0].start, + tp->sackblks[0].end); + } else { + tcp_update_dsack_list(tp, save_start, + save_start + save_tlen); + } + } else if (tlen >= save_tlen) { + /* Update of sackblks. */ + tcp_update_dsack_list(tp, save_start, + save_start + save_tlen); + } else if (tlen > 0) { + tcp_update_dsack_list(tp, save_start, + save_start + tlen); + } + } + } else { + m_freem(m); + thflags &= ~TH_FIN; + } + + /* + * If FIN is received ACK the FIN and let the user know that the + * connection is closing. + */ + if (thflags & TH_FIN) { + if (TCPS_HAVERCVDFIN(tp->t_state) == 0) { + socantrcvmore(so); + /* + * If connection is half-synchronized (ie NEEDSYN + * flag on) then delay ACK, so it may be piggybacked + * when SYN is sent. Otherwise, since we received a + * FIN then no more input can be expected, send ACK + * now. + */ + if (tp->t_flags & TF_NEEDSYN) { + tp->t_flags |= TF_DELACK; + bbr_timer_cancel(bbr, + __LINE__, bbr->r_ctl.rc_rcvtime); + } else { + tp->t_flags |= TF_ACKNOW; + } + tp->rcv_nxt++; + } + switch (tp->t_state) { + + /* + * In SYN_RECEIVED and ESTABLISHED STATES enter the + * CLOSE_WAIT state. + */ + case TCPS_SYN_RECEIVED: + tp->t_starttime = ticks; + /* FALLTHROUGH */ + case TCPS_ESTABLISHED: + tcp_state_change(tp, TCPS_CLOSE_WAIT); + break; + + /* + * If still in FIN_WAIT_1 STATE FIN has not been + * acked so enter the CLOSING state. + */ + case TCPS_FIN_WAIT_1: + tcp_state_change(tp, TCPS_CLOSING); + break; + + /* + * In FIN_WAIT_2 state enter the TIME_WAIT state, + * starting the time-wait timer, turning off the + * other standard timers. + */ + case TCPS_FIN_WAIT_2: + bbr->rc_timer_first = 1; + bbr_timer_cancel(bbr, + __LINE__, bbr->r_ctl.rc_rcvtime); + INP_INFO_RLOCK_ASSERT(&V_tcbinfo); + INP_WLOCK_ASSERT(tp->t_inpcb); + tcp_twstart(tp); + return (1); + } + } + /* + * Return any desired output. + */ + if ((tp->t_flags & TF_ACKNOW) || + (sbavail(&so->so_snd) > ctf_outstanding(tp))) { + bbr->r_wanted_output = 1; + } + INP_WLOCK_ASSERT(tp->t_inpcb); + return (0); +} + +/* + * Here nothing is really faster, its just that we + * have broken out the fast-data path also just like + * the fast-ack. Return 1 if we processed the packet + * return 0 if you need to take the "slow-path". + */ +static int +bbr_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t nxt_pkt) +{ + uint16_t nsegs; + int32_t newsize = 0; /* automatic sockbuf scaling */ + struct tcp_bbr *bbr; +#ifdef NETFLIX_SB_LIMITS + u_int mcnt, appended; +#endif +#ifdef TCPDEBUG + /* + * The size of tcp_saveipgen must be the size of the max ip header, + * now IPv6. + */ + u_char tcp_saveipgen[IP6_HDR_LEN]; + struct tcphdr tcp_savetcp; + short ostate = 0; + +#endif + /* On the hpts and we would have called output */ + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + + /* + * If last ACK falls within this segment's sequence numbers, record + * the timestamp. NOTE that the test is modified according to the + * latest proposal of the tcplw@cray.com list (Braden 1993/04/26). + */ + if (bbr->r_ctl.rc_resend != NULL) { + return (0); + } + if (tiwin && tiwin != tp->snd_wnd) { + return (0); + } + if (__predict_false((tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN)))) { + return (0); + } + if (__predict_false((to->to_flags & TOF_TS) && + (TSTMP_LT(to->to_tsval, tp->ts_recent)))) { + return (0); + } + if (__predict_false((th->th_ack != tp->snd_una))) { + return (0); + } + if (__predict_false(tlen > sbspace(&so->so_rcv))) { + return (0); + } + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent)) { + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + tp->ts_recent = to->to_tsval; + } + /* + * This is a pure, in-sequence data packet with nothing on the + * reassembly queue and we have enough buffer space to take it. + */ + nsegs = max(1, m->m_pkthdr.lro_nsegs); +#ifdef NETFLIX_SB_LIMITS + if (so->so_rcv.sb_shlim) { + mcnt = m_memcnt(m); + appended = 0; + if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, + CFO_NOSLEEP, NULL) == false) { + counter_u64_add(tcp_sb_shlim_fails, 1); + m_freem(m); + return (1); + } + } +#endif + /* Clean receiver SACK report if present */ + if (tp->rcv_numsacks) + tcp_clean_sackreport(tp); + TCPSTAT_INC(tcps_preddat); + tp->rcv_nxt += tlen; + /* + * Pull snd_wl1 up to prevent seq wrap relative to th_seq. + */ + tp->snd_wl1 = th->th_seq; + /* + * Pull rcv_up up to prevent seq wrap relative to rcv_nxt. + */ + tp->rcv_up = tp->rcv_nxt; + TCPSTAT_ADD(tcps_rcvpack, (int)nsegs); + TCPSTAT_ADD(tcps_rcvbyte, tlen); +#ifdef TCPDEBUG + if (so->so_options & SO_DEBUG) + tcp_trace(TA_INPUT, ostate, tp, + (void *)tcp_saveipgen, &tcp_savetcp, 0); +#endif + newsize = tcp_autorcvbuf(m, th, so, tp, tlen); + + /* Add data to socket buffer. */ + SOCKBUF_LOCK(&so->so_rcv); + if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { + m_freem(m); + } else { + /* + * Set new socket buffer size. Give up when limit is + * reached. + */ + if (newsize) + if (!sbreserve_locked(&so->so_rcv, + newsize, so, NULL)) + so->so_rcv.sb_flags &= ~SB_AUTOSIZE; + m_adj(m, drop_hdrlen); /* delayed header drop */ +#ifdef NETFLIX_SB_LIMITS + appended = +#endif + sbappendstream_locked(&so->so_rcv, m, 0); + ctf_calc_rwin(so, tp); + } + /* NB: sorwakeup_locked() does an implicit unlock. */ + sorwakeup_locked(so); +#ifdef NETFLIX_SB_LIMITS + if (so->so_rcv.sb_shlim && mcnt != appended) + counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended); +#endif + if (DELAY_ACK(tp, bbr, nsegs)) { + bbr->bbr_segs_rcvd += max(1, nsegs); + tp->t_flags |= TF_DELACK; + bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); + } else { + bbr->r_wanted_output = 1; + tp->t_flags |= TF_ACKNOW; + } + return (1); +} + +/* + * This subfunction is used to try to highly optimize the + * fast path. We again allow window updates that are + * in sequence to remain in the fast-path. We also add + * in the __predict's to attempt to help the compiler. + * Note that if we return a 0, then we can *not* process + * it and the caller should push the packet into the + * slow-path. If we return 1, then all is well and + * the packet is fully processed. + */ +static int +bbr_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t nxt_pkt) +{ + int32_t acked; + uint16_t nsegs; + uint32_t sack_changed; +#ifdef TCPDEBUG + /* + * The size of tcp_saveipgen must be the size of the max ip header, + * now IPv6. + */ + u_char tcp_saveipgen[IP6_HDR_LEN]; + struct tcphdr tcp_savetcp; + short ostate = 0; + +#endif + uint32_t prev_acked = 0; + struct tcp_bbr *bbr; + + if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { + /* Old ack, behind (or duplicate to) the last one rcv'd */ + return (0); + } + if (__predict_false(SEQ_GT(th->th_ack, tp->snd_max))) { + /* Above what we have sent? */ + return (0); + } + if (__predict_false(tiwin == 0)) { + /* zero window */ + return (0); + } + if (__predict_false(tp->t_flags & (TF_NEEDSYN | TF_NEEDFIN))) { + /* We need a SYN or a FIN, unlikely.. */ + return (0); + } + if ((to->to_flags & TOF_TS) && __predict_false(TSTMP_LT(to->to_tsval, tp->ts_recent))) { + /* Timestamp is behind .. old ack with seq wrap? */ + return (0); + } + if (__predict_false(IN_RECOVERY(tp->t_flags))) { + /* Still recovering */ + return (0); + } + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + if (__predict_false(bbr->r_ctl.rc_resend != NULL)) { + /* We are retransmitting */ + return (0); + } + if (__predict_false(bbr->rc_in_persist != 0)) { + /* In persist mode */ + return (0); + } + if (bbr->r_ctl.rc_sacked) { + /* We have sack holes on our scoreboard */ + return (0); + } + /* Ok if we reach here, we can process a fast-ack */ + nsegs = max(1, m->m_pkthdr.lro_nsegs); + sack_changed = bbr_log_ack(tp, to, th, &prev_acked); + /* + * We never detect loss in fast ack [we can't + * have a sack and can't be in recovery so + * we always pass 0 (nothing detected)]. + */ + bbr_lt_bw_sampling(bbr, bbr->r_ctl.rc_rcvtime, 0); + /* Did the window get updated? */ + if (tiwin != tp->snd_wnd) { + tp->snd_wnd = tiwin; + tp->snd_wl1 = th->th_seq; + if (tp->snd_wnd > tp->max_sndwnd) + tp->max_sndwnd = tp->snd_wnd; + } + /* Do we need to exit persists? */ + if ((bbr->rc_in_persist != 0) && + (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), + bbr_minseg(bbr)))) { + bbr_exit_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); + bbr->r_wanted_output = 1; + } + /* Do we need to enter persists? */ + if ((bbr->rc_in_persist == 0) && + (tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && + TCPS_HAVEESTABLISHED(tp->t_state) && + (tp->snd_max == tp->snd_una) && + sbavail(&tp->t_inpcb->inp_socket->so_snd) && + (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { + /* No send window.. we must enter persist */ + bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); + } + /* + * If last ACK falls within this segment's sequence numbers, record + * the timestamp. NOTE that the test is modified according to the + * latest proposal of the tcplw@cray.com list (Braden 1993/04/26). + */ + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent)) { + tp->ts_recent_age = bbr->r_ctl.rc_rcvtime; + tp->ts_recent = to->to_tsval; + } + /* + * This is a pure ack for outstanding data. + */ + TCPSTAT_INC(tcps_predack); + + /* + * "bad retransmit" recovery. + */ + if (tp->t_flags & TF_PREVVALID) { + tp->t_flags &= ~TF_PREVVALID; + if (tp->t_rxtshift == 1 && + (int)(ticks - tp->t_badrxtwin) < 0) + bbr_cong_signal(tp, th, CC_RTO_ERR, NULL); + } + /* + * Recalculate the transmit timer / rtt. + * + * Some boxes send broken timestamp replies during the SYN+ACK + * phase, ignore timestamps of 0 or we could calculate a huge RTT + * and blow up the retransmit timer. + */ + acked = BYTES_THIS_ACK(tp, th); + +#ifdef TCP_HHOOK + /* Run HHOOK_TCP_ESTABLISHED_IN helper hooks. */ + hhook_run_tcp_est_in(tp, th, to); +#endif + + TCPSTAT_ADD(tcps_rcvackpack, (int)nsegs); + TCPSTAT_ADD(tcps_rcvackbyte, acked); + sbdrop(&so->so_snd, acked); + + if (SEQ_GT(th->th_ack, tp->snd_una)) + bbr_collapse_rtt(tp, bbr, TCP_REXMTVAL(tp)); + tp->snd_una = th->th_ack; + if (tp->snd_wnd < ctf_outstanding(tp)) + /* The peer collapsed its window on us */ + bbr_collapsed_window(bbr); + else if (bbr->rc_has_collapsed) + bbr_un_collapse_window(bbr); + + if (SEQ_GT(tp->snd_una, tp->snd_recover)) { + tp->snd_recover = tp->snd_una; + } + bbr_ack_received(tp, bbr, th, acked, sack_changed, prev_acked, __LINE__, 0); + /* + * Pull snd_wl2 up to prevent seq wrap relative to th_ack. + */ + tp->snd_wl2 = th->th_ack; + m_freem(m); + /* + * If all outstanding data are acked, stop retransmit timer, + * otherwise restart timer using current (possibly backed-off) + * value. If process is waiting for space, wakeup/selwakeup/signal. + * If data are ready to send, let tcp_output decide between more + * output or persist. + */ +#ifdef TCPDEBUG + if (so->so_options & SO_DEBUG) + tcp_trace(TA_INPUT, ostate, tp, + (void *)tcp_saveipgen, + &tcp_savetcp, 0); +#endif + /* Wake up the socket if we have room to write more */ + sowwakeup(so); + if (tp->snd_una == tp->snd_max) { + /* Nothing left outstanding */ + bbr_log_progress_event(bbr, tp, ticks, PROGRESS_CLEAR, __LINE__); + if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) + bbr->rc_tp->t_acktime = 0; + bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); + if (bbr->rc_in_persist == 0) { + bbr->r_ctl.rc_went_idle_time = bbr->r_ctl.rc_rcvtime; + } + sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); + bbr_log_ack_clear(bbr, bbr->r_ctl.rc_rcvtime); + /* + * We invalidate the last ack here since we + * don't want to transfer forward the time + * for our sum's calculations. + */ + bbr->r_wanted_output = 1; + } + if (sbavail(&so->so_snd)) { + bbr->r_wanted_output = 1; + } + return (1); +} + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + int32_t todrop; + int32_t ourfinisacked = 0; + struct tcp_bbr *bbr; + int32_t ret_val = 0; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + ctf_calc_rwin(so, tp); + /* + * If the state is SYN_SENT: if seg contains an ACK, but not for our + * SYN, drop the input. if seg contains a RST, then drop the + * connection. if seg does not contain SYN, then drop it. Otherwise + * this is an acceptable SYN segment initialize tp->rcv_nxt and + * tp->irs if seg contains ack then advance tp->snd_una. BRR does + * not support ECN so we will not say we are capable. if SYN has + * been acked change to ESTABLISHED else SYN_RCVD state arrange for + * segment to be acked (eventually) continue processing rest of + * data/controls, beginning with URG + */ + if ((thflags & TH_ACK) && + (SEQ_LEQ(th->th_ack, tp->iss) || + SEQ_GT(th->th_ack, tp->snd_max))) { + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) { + TCP_PROBE5(connect__refused, NULL, tp, + mtod(m, const char *), tp, th); + tp = tcp_drop(tp, ECONNREFUSED); + ctf_do_drop(m, tp); + return (1); + } + if (thflags & TH_RST) { + ctf_do_drop(m, tp); + return (1); + } + if (!(thflags & TH_SYN)) { + ctf_do_drop(m, tp); + return (1); + } + tp->irs = th->th_seq; + tcp_rcvseqinit(tp); + if (thflags & TH_ACK) { + int tfo_partial = 0; + + TCPSTAT_INC(tcps_connects); + soisconnected(so); +#ifdef MAC + mac_socketpeer_set_from_mbuf(m, so); +#endif + /* Do window scaling on this connection? */ + if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == + (TF_RCVD_SCALE | TF_REQ_SCALE)) { + tp->rcv_scale = tp->request_r_scale; + } + tp->rcv_adv += min(tp->rcv_wnd, + TCP_MAXWIN << tp->rcv_scale); + /* + * If not all the data that was sent in the TFO SYN + * has been acked, resend the remainder right away. + */ + if (IS_FASTOPEN(tp->t_flags) && + (tp->snd_una != tp->snd_max)) { + tp->snd_nxt = th->th_ack; + tfo_partial = 1; + } + /* + * If there's data, delay ACK; if there's also a FIN ACKNOW + * will be turned on later. + */ + if (DELAY_ACK(tp, bbr, 1) && tlen != 0 && (tfo_partial == 0)) { + bbr->bbr_segs_rcvd += 1; + tp->t_flags |= TF_DELACK; + bbr_timer_cancel(bbr, __LINE__, bbr->r_ctl.rc_rcvtime); + } else { + bbr->r_wanted_output = 1; + tp->t_flags |= TF_ACKNOW; + } + if (SEQ_GT(th->th_ack, tp->iss)) { + /* + * The SYN is acked + * handle it specially. + */ + bbr_log_syn(tp, to); + } + if (SEQ_GT(th->th_ack, tp->snd_una)) { + /* + * We advance snd_una for the + * fast open case. If th_ack is + * acknowledging data beyond + * snd_una we can't just call + * ack-processing since the + * data stream in our send-map + * will start at snd_una + 1 (one + * beyond the SYN). If its just + * equal we don't need to do that + * and there is no send_map. + */ + tp->snd_una++; + } + /* + * Received <SYN,ACK> in SYN_SENT[*] state. Transitions: + * SYN_SENT --> ESTABLISHED SYN_SENT* --> FIN_WAIT_1 + */ + tp->t_starttime = ticks; + if (tp->t_flags & TF_NEEDFIN) { + tcp_state_change(tp, TCPS_FIN_WAIT_1); + tp->t_flags &= ~TF_NEEDFIN; + thflags &= ~TH_SYN; + } else { + tcp_state_change(tp, TCPS_ESTABLISHED); + TCP_PROBE5(connect__established, NULL, tp, + mtod(m, const char *), tp, th); + cc_conn_init(tp); + } + } else { + /* + * Received initial SYN in SYN-SENT[*] state => simultaneous + * open. If segment contains CC option and there is a + * cached CC, apply TAO test. If it succeeds, connection is * + * half-synchronized. Otherwise, do 3-way handshake: + * SYN-SENT -> SYN-RECEIVED SYN-SENT* -> SYN-RECEIVED* If + * there was no CC option, clear cached CC value. + */ + tp->t_flags |= (TF_ACKNOW | TF_NEEDSYN); + tcp_state_change(tp, TCPS_SYN_RECEIVED); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + /* + * Advance th->th_seq to correspond to first data byte. If data, + * trim to stay within window, dropping FIN if necessary. + */ + th->th_seq++; + if (tlen > tp->rcv_wnd) { + todrop = tlen - tp->rcv_wnd; + m_adj(m, -todrop); + tlen = tp->rcv_wnd; + thflags &= ~TH_FIN; + TCPSTAT_INC(tcps_rcvpackafterwin); + TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop); + } + tp->snd_wl1 = th->th_seq - 1; + tp->rcv_up = th->th_seq; + /* + * Client side of transaction: already sent SYN and data. If the + * remote host used T/TCP to validate the SYN, our data will be + * ACK'd; if so, enter normal data segment processing in the middle + * of step 5, ack processing. Otherwise, goto step 6. + */ + if (thflags & TH_ACK) { + if ((to->to_flags & TOF_TS) != 0) { + uint32_t t, rtt; + + t = tcp_tv_to_mssectick(&bbr->rc_tv); + if (TSTMP_GEQ(t, to->to_tsecr)) { + rtt = t - to->to_tsecr; + if (rtt == 0) { + rtt = 1; + } + rtt *= MS_IN_USEC; + tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0); + apply_filter_min_small(&bbr->r_ctl.rc_rttprop, + rtt, bbr->r_ctl.rc_rcvtime); + } + } + if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) + return (ret_val); + /* We may have changed to FIN_WAIT_1 above */ + if (tp->t_state == TCPS_FIN_WAIT_1) { + /* + * In FIN_WAIT_1 STATE in addition to the processing + * for the ESTABLISHED state if our FIN is now + * acknowledged then enter FIN_WAIT_2. + */ + if (ourfinisacked) { + /* + * If we can't receive any more data, then + * closing user can proceed. Starting the + * timer is contrary to the specification, + * but if we don't get a FIN we'll hang + * forever. + * + * XXXjl: we should release the tp also, and + * use a compressed state. + */ + if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { + soisdisconnected(so); + tcp_timer_activate(tp, TT_2MSL, + (tcp_fast_finwait2_recycle ? + tcp_finwait2_timeout : + TP_MAXIDLE(tp))); + } + tcp_state_change(tp, TCPS_FIN_WAIT_2); + } + } + } + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); +} + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + int32_t ourfinisacked = 0; + int32_t ret_val; + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + ctf_calc_rwin(so, tp); + if ((thflags & TH_ACK) && + (SEQ_LEQ(th->th_ack, tp->snd_una) || + SEQ_GT(th->th_ack, tp->snd_max))) { + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + if (IS_FASTOPEN(tp->t_flags)) { + /* + * When a TFO connection is in SYN_RECEIVED, the only valid + * packets are the initial SYN, a retransmit/copy of the + * initial SYN (possibly with a subset of the original + * data), a valid ACK, a FIN, or a RST. + */ + if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) { + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } else if (thflags & TH_SYN) { + /* non-initial SYN is ignored */ + if ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_RXT) || + (bbr->r_ctl.rc_hpts_flags & PACE_TMR_TLP) || + (bbr->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) { + ctf_do_drop(m, NULL); + return (0); + } + } else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) { + ctf_do_drop(m, NULL); + return (0); + } + } + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); + /* + * RFC 1323 PAWS: If we have a timestamp reply on this segment and + * it's less than ts_recent, drop it. + */ + if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && + TSTMP_LT(to->to_tsval, tp->ts_recent)) { + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) + return (ret_val); + } + /* + * In the SYN-RECEIVED state, validate that the packet belongs to + * this connection before trimming the data to fit the receive + * window. Check the sequence number versus IRS since we know the + * sequence numbers haven't wrapped. This is a partial fix for the + * "LAND" DoS attack. + */ + if (SEQ_LT(th->th_seq, tp->irs)) { + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + return (ret_val); + } + /* + * If last ACK falls within this segment's sequence numbers, record + * its timestamp. NOTE: 1) That the test incorporates suggestions + * from the latest proposal of the tcplw@cray.com list (Braden + * 1993/04/26). 2) That updating only on newer timestamps interferes + * with our earlier PAWS tests, so this check should be solely + * predicated on the sequence space of this segment. 3) That we + * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ + * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + + * SEG.Len, This modified check allows us to overcome RFC1323's + * limitations as described in Stevens TCP/IP Illustrated Vol. 2 + * p.869. In such cases, we can still calculate the RTT correctly + * when RCV.NXT == Last.ACK.Sent. + */ + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent) && + SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + + ((thflags & (TH_SYN | TH_FIN)) != 0))) { + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + tp->ts_recent = to->to_tsval; + } + tp->snd_wnd = tiwin; + /* + * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag + * is on (half-synchronized state), then queue data for later + * processing; else drop segment and return. + */ + if ((thflags & TH_ACK) == 0) { + if (IS_FASTOPEN(tp->t_flags)) { + cc_conn_init(tp); + } + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); + } + TCPSTAT_INC(tcps_connects); + soisconnected(so); + /* Do window scaling? */ + if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == + (TF_RCVD_SCALE | TF_REQ_SCALE)) { + tp->rcv_scale = tp->request_r_scale; + } + /* + * ok for the first time in lets see if we can use the ts to figure + * out what the initial RTT was. + */ + if ((to->to_flags & TOF_TS) != 0) { + uint32_t t, rtt; + + t = tcp_tv_to_mssectick(&bbr->rc_tv); + if (TSTMP_GEQ(t, to->to_tsecr)) { + rtt = t - to->to_tsecr; + if (rtt == 0) { + rtt = 1; + } + rtt *= MS_IN_USEC; + tcp_bbr_xmit_timer(bbr, rtt, 0, 0, 0); + apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, bbr->r_ctl.rc_rcvtime); + } + } + /* Drop off any SYN in the send map (probably not there) */ + if (thflags & TH_ACK) + bbr_log_syn(tp, to); + if (IS_FASTOPEN(tp->t_flags) && tp->t_tfo_pending) { + + tcp_fastopen_decrement_counter(tp->t_tfo_pending); + tp->t_tfo_pending = NULL; + /* + * Account for the ACK of our SYN prior to regular + * ACK processing below. + */ + tp->snd_una++; + } + /* + * Make transitions: SYN-RECEIVED -> ESTABLISHED SYN-RECEIVED* -> + * FIN-WAIT-1 + */ + tp->t_starttime = ticks; + if (tp->t_flags & TF_NEEDFIN) { + tcp_state_change(tp, TCPS_FIN_WAIT_1); + tp->t_flags &= ~TF_NEEDFIN; + } else { + tcp_state_change(tp, TCPS_ESTABLISHED); + TCP_PROBE5(accept__established, NULL, tp, + mtod(m, const char *), tp, th); + /* + * TFO connections call cc_conn_init() during SYN + * processing. Calling it again here for such connections + * is not harmless as it would undo the snd_cwnd reduction + * that occurs when a TFO SYN|ACK is retransmitted. + */ + if (!IS_FASTOPEN(tp->t_flags)) + cc_conn_init(tp); + } + /* + * If segment contains data or ACK, will call tcp_reass() later; if + * not, do so now to pass queued data to user. + */ + if (tlen == 0 && (thflags & TH_FIN) == 0) + (void)tcp_reass(tp, (struct tcphdr *)0, NULL, 0, + (struct mbuf *)0); + tp->snd_wl1 = th->th_seq - 1; + if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { + return (ret_val); + } + if (tp->t_state == TCPS_FIN_WAIT_1) { + /* We could have went to FIN_WAIT_1 (or EST) above */ + /* + * In FIN_WAIT_1 STATE in addition to the processing for the + * ESTABLISHED state if our FIN is now acknowledged then + * enter FIN_WAIT_2. + */ + if (ourfinisacked) { + /* + * If we can't receive any more data, then closing + * user can proceed. Starting the timer is contrary + * to the specification, but if we don't get a FIN + * we'll hang forever. + * + * XXXjl: we should release the tp also, and use a + * compressed state. + */ + if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { + soisdisconnected(so); + tcp_timer_activate(tp, TT_2MSL, + (tcp_fast_finwait2_recycle ? + tcp_finwait2_timeout : + TP_MAXIDLE(tp))); + } + tcp_state_change(tp, TCPS_FIN_WAIT_2); + } + } + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); +} + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + struct tcp_bbr *bbr; + int32_t ret_val; + + /* + * Header prediction: check for the two common cases of a + * uni-directional data xfer. If the packet has no control flags, + * is in-sequence, the window didn't change and we're not + * retransmitting, it's a candidate. If the length is zero and the + * ack moved forward, we're the sender side of the xfer. Just free + * the data acked & wake any higher level process that was blocked + * waiting for space. If the length is non-zero and the ack didn't + * move, we're the receiver side. If we're getting packets in-order + * (the reassembly queue is empty), add the data toc The socket + * buffer and note that we need a delayed ack. Make sure that the + * hidden state-flags are also off. Since we check for + * TCPS_ESTABLISHED first, it can only be TH_NEEDSYN. + */ + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + if (bbr->r_ctl.rc_delivered < (4 * tp->t_maxseg)) { + /* + * If we have delived under 4 segments increase the initial + * window if raised by the peer. We use this to determine + * dynamic and static rwnd's at the end of a connection. + */ + bbr->r_ctl.rc_init_rwnd = max(tiwin, tp->snd_wnd); + } + if (__predict_true(((to->to_flags & TOF_SACK) == 0)) && + __predict_true((thflags & (TH_SYN | TH_FIN | TH_RST | TH_URG | TH_ACK)) == TH_ACK) && + __predict_true(SEGQ_EMPTY(tp)) && + __predict_true(th->th_seq == tp->rcv_nxt)) { + if (tlen == 0) { + if (bbr_fastack(m, th, so, tp, to, drop_hdrlen, tlen, + tiwin, nxt_pkt)) { + return (0); + } + } else { + if (bbr_do_fastnewdata(m, th, so, tp, to, drop_hdrlen, tlen, + tiwin, nxt_pkt)) { + return (0); + } + } + } + ctf_calc_rwin(so, tp); + + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); + /* + * RFC5961 Section 4.2 Send challenge ACK for any SYN in + * synchronized state. + */ + if (thflags & TH_SYN) { + ctf_challenge_ack(m, th, tp, &ret_val); + return (ret_val); + } + /* + * RFC 1323 PAWS: If we have a timestamp reply on this segment and + * it's less than ts_recent, drop it. + */ + if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && + TSTMP_LT(to->to_tsval, tp->ts_recent)) { + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) + return (ret_val); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + return (ret_val); + } + /* + * If last ACK falls within this segment's sequence numbers, record + * its timestamp. NOTE: 1) That the test incorporates suggestions + * from the latest proposal of the tcplw@cray.com list (Braden + * 1993/04/26). 2) That updating only on newer timestamps interferes + * with our earlier PAWS tests, so this check should be solely + * predicated on the sequence space of this segment. 3) That we + * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ + * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + + * SEG.Len, This modified check allows us to overcome RFC1323's + * limitations as described in Stevens TCP/IP Illustrated Vol. 2 + * p.869. In such cases, we can still calculate the RTT correctly + * when RCV.NXT == Last.ACK.Sent. + */ + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent) && + SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + + ((thflags & (TH_SYN | TH_FIN)) != 0))) { + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + tp->ts_recent = to->to_tsval; + } + /* + * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag + * is on (half-synchronized state), then queue data for later + * processing; else drop segment and return. + */ + if ((thflags & TH_ACK) == 0) { + if (tp->t_flags & TF_NEEDSYN) { + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); + } else if (tp->t_flags & TF_ACKNOW) { + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + bbr->r_wanted_output = 1; + return (ret_val); + } else { + ctf_do_drop(m, NULL); + return (0); + } + } + /* + * Ack processing. + */ + if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) { + return (ret_val); + } + if (sbavail(&so->so_snd)) { + if (bbr_progress_timeout_check(bbr)) { + ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + } + /* State changes only happen in bbr_process_data() */ + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); +} + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + struct tcp_bbr *bbr; + int32_t ret_val; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + ctf_calc_rwin(so, tp); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); + /* + * RFC5961 Section 4.2 Send challenge ACK for any SYN in + * synchronized state. + */ + if (thflags & TH_SYN) { + ctf_challenge_ack(m, th, tp, &ret_val); + return (ret_val); + } + /* + * RFC 1323 PAWS: If we have a timestamp reply on this segment and + * it's less than ts_recent, drop it. + */ + if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && + TSTMP_LT(to->to_tsval, tp->ts_recent)) { + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) + return (ret_val); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + return (ret_val); + } + /* + * If last ACK falls within this segment's sequence numbers, record + * its timestamp. NOTE: 1) That the test incorporates suggestions + * from the latest proposal of the tcplw@cray.com list (Braden + * 1993/04/26). 2) That updating only on newer timestamps interferes + * with our earlier PAWS tests, so this check should be solely + * predicated on the sequence space of this segment. 3) That we + * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ + * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + + * SEG.Len, This modified check allows us to overcome RFC1323's + * limitations as described in Stevens TCP/IP Illustrated Vol. 2 + * p.869. In such cases, we can still calculate the RTT correctly + * when RCV.NXT == Last.ACK.Sent. + */ + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent) && + SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + + ((thflags & (TH_SYN | TH_FIN)) != 0))) { + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + tp->ts_recent = to->to_tsval; + } + /* + * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag + * is on (half-synchronized state), then queue data for later + * processing; else drop segment and return. + */ + if ((thflags & TH_ACK) == 0) { + if (tp->t_flags & TF_NEEDSYN) { + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); + } else if (tp->t_flags & TF_ACKNOW) { + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + bbr->r_wanted_output = 1; + return (ret_val); + } else { + ctf_do_drop(m, NULL); + return (0); + } + } + /* + * Ack processing. + */ + if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, NULL, thflags, &ret_val)) { + return (ret_val); + } + if (sbavail(&so->so_snd)) { + if (bbr_progress_timeout_check(bbr)) { + ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + } + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); +} + +static int +bbr_check_data_after_close(struct mbuf *m, struct tcp_bbr *bbr, + struct tcpcb *tp, int32_t * tlen, struct tcphdr *th, struct socket *so) +{ + + INP_INFO_RLOCK_ASSERT(&V_tcbinfo); + if (bbr->rc_allow_data_af_clo == 0) { +close_now: + tp = tcp_close(tp); + TCPSTAT_INC(tcps_rcvafterclose); + ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen)); + return (1); + } + if (sbavail(&so->so_snd) == 0) + goto close_now; + /* Ok we allow data that is ignored and a followup reset */ + tp->rcv_nxt = th->th_seq + *tlen; + tp->t_flags2 |= TF2_DROP_AF_DATA; + bbr->r_wanted_output = 1; + *tlen = 0; + return (0); +} + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + int32_t ourfinisacked = 0; + int32_t ret_val; + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + ctf_calc_rwin(so, tp); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); + /* + * RFC5961 Section 4.2 Send challenge ACK for any SYN in + * synchronized state. + */ + if (thflags & TH_SYN) { + ctf_challenge_ack(m, th, tp, &ret_val); + return (ret_val); + } + /* + * RFC 1323 PAWS: If we have a timestamp reply on this segment and + * it's less than ts_recent, drop it. + */ + if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && + TSTMP_LT(to->to_tsval, tp->ts_recent)) { + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) + return (ret_val); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + return (ret_val); + } + /* + * If new data are received on a connection after the user processes + * are gone, then RST the other end. + */ + if ((so->so_state & SS_NOFDREF) && tlen) { + /* + * We call a new function now so we might continue and setup + * to reset at all data being ack'd. + */ + if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) + return (1); + } + /* + * If last ACK falls within this segment's sequence numbers, record + * its timestamp. NOTE: 1) That the test incorporates suggestions + * from the latest proposal of the tcplw@cray.com list (Braden + * 1993/04/26). 2) That updating only on newer timestamps interferes + * with our earlier PAWS tests, so this check should be solely + * predicated on the sequence space of this segment. 3) That we + * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ + * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + + * SEG.Len, This modified check allows us to overcome RFC1323's + * limitations as described in Stevens TCP/IP Illustrated Vol. 2 + * p.869. In such cases, we can still calculate the RTT correctly + * when RCV.NXT == Last.ACK.Sent. + */ + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent) && + SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + + ((thflags & (TH_SYN | TH_FIN)) != 0))) { + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + tp->ts_recent = to->to_tsval; + } + /* + * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag + * is on (half-synchronized state), then queue data for later + * processing; else drop segment and return. + */ + if ((thflags & TH_ACK) == 0) { + if (tp->t_flags & TF_NEEDSYN) { + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); + } else if (tp->t_flags & TF_ACKNOW) { + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + bbr->r_wanted_output = 1; + return (ret_val); + } else { + ctf_do_drop(m, NULL); + return (0); + } + } + /* + * Ack processing. + */ + if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { + return (ret_val); + } + if (ourfinisacked) { + /* + * If we can't receive any more data, then closing user can + * proceed. Starting the timer is contrary to the + * specification, but if we don't get a FIN we'll hang + * forever. + * + * XXXjl: we should release the tp also, and use a + * compressed state. + */ + if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { + soisdisconnected(so); + tcp_timer_activate(tp, TT_2MSL, + (tcp_fast_finwait2_recycle ? + tcp_finwait2_timeout : + TP_MAXIDLE(tp))); + } + tcp_state_change(tp, TCPS_FIN_WAIT_2); + } + if (sbavail(&so->so_snd)) { + if (bbr_progress_timeout_check(bbr)) { + ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + } + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); +} + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + int32_t ourfinisacked = 0; + int32_t ret_val; + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + ctf_calc_rwin(so, tp); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); + /* + * RFC5961 Section 4.2 Send challenge ACK for any SYN in + * synchronized state. + */ + if (thflags & TH_SYN) { + ctf_challenge_ack(m, th, tp, &ret_val); + return (ret_val); + } + /* + * RFC 1323 PAWS: If we have a timestamp reply on this segment and + * it's less than ts_recent, drop it. + */ + if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && + TSTMP_LT(to->to_tsval, tp->ts_recent)) { + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) + return (ret_val); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + return (ret_val); + } + /* + * If new data are received on a connection after the user processes + * are gone, then RST the other end. + */ + if ((so->so_state & SS_NOFDREF) && tlen) { + /* + * We call a new function now so we might continue and setup + * to reset at all data being ack'd. + */ + if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) + return (1); + } + /* + * If last ACK falls within this segment's sequence numbers, record + * its timestamp. NOTE: 1) That the test incorporates suggestions + * from the latest proposal of the tcplw@cray.com list (Braden + * 1993/04/26). 2) That updating only on newer timestamps interferes + * with our earlier PAWS tests, so this check should be solely + * predicated on the sequence space of this segment. 3) That we + * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ + * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + + * SEG.Len, This modified check allows us to overcome RFC1323's + * limitations as described in Stevens TCP/IP Illustrated Vol. 2 + * p.869. In such cases, we can still calculate the RTT correctly + * when RCV.NXT == Last.ACK.Sent. + */ + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent) && + SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + + ((thflags & (TH_SYN | TH_FIN)) != 0))) { + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + tp->ts_recent = to->to_tsval; + } + /* + * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag + * is on (half-synchronized state), then queue data for later + * processing; else drop segment and return. + */ + if ((thflags & TH_ACK) == 0) { + if (tp->t_flags & TF_NEEDSYN) { + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); + } else if (tp->t_flags & TF_ACKNOW) { + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + bbr->r_wanted_output = 1; + return (ret_val); + } else { + ctf_do_drop(m, NULL); + return (0); + } + } + /* + * Ack processing. + */ + if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { + return (ret_val); + } + if (ourfinisacked) { + INP_INFO_RLOCK_ASSERT(&V_tcbinfo); + tcp_twstart(tp); + m_freem(m); + return (1); + } + if (sbavail(&so->so_snd)) { + if (bbr_progress_timeout_check(bbr)) { + ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + } + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); +} + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + int32_t ourfinisacked = 0; + int32_t ret_val; + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + ctf_calc_rwin(so, tp); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); + /* + * RFC5961 Section 4.2 Send challenge ACK for any SYN in + * synchronized state. + */ + if (thflags & TH_SYN) { + ctf_challenge_ack(m, th, tp, &ret_val); + return (ret_val); + } + /* + * RFC 1323 PAWS: If we have a timestamp reply on this segment and + * it's less than ts_recent, drop it. + */ + if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && + TSTMP_LT(to->to_tsval, tp->ts_recent)) { + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) + return (ret_val); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + return (ret_val); + } + /* + * If new data are received on a connection after the user processes + * are gone, then RST the other end. + */ + if ((so->so_state & SS_NOFDREF) && tlen) { + /* + * We call a new function now so we might continue and setup + * to reset at all data being ack'd. + */ + if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) + return (1); + } + /* + * If last ACK falls within this segment's sequence numbers, record + * its timestamp. NOTE: 1) That the test incorporates suggestions + * from the latest proposal of the tcplw@cray.com list (Braden + * 1993/04/26). 2) That updating only on newer timestamps interferes + * with our earlier PAWS tests, so this check should be solely + * predicated on the sequence space of this segment. 3) That we + * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ + * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + + * SEG.Len, This modified check allows us to overcome RFC1323's + * limitations as described in Stevens TCP/IP Illustrated Vol. 2 + * p.869. In such cases, we can still calculate the RTT correctly + * when RCV.NXT == Last.ACK.Sent. + */ + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent) && + SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + + ((thflags & (TH_SYN | TH_FIN)) != 0))) { + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + tp->ts_recent = to->to_tsval; + } + /* + * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag + * is on (half-synchronized state), then queue data for later + * processing; else drop segment and return. + */ + if ((thflags & TH_ACK) == 0) { + if (tp->t_flags & TF_NEEDSYN) { + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); + } else if (tp->t_flags & TF_ACKNOW) { + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + bbr->r_wanted_output = 1; + return (ret_val); + } else { + ctf_do_drop(m, NULL); + return (0); + } + } + /* + * case TCPS_LAST_ACK: Ack processing. + */ + if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { + return (ret_val); + } + if (ourfinisacked) { + INP_INFO_RLOCK_ASSERT(&V_tcbinfo); + tp = tcp_close(tp); + ctf_do_drop(m, tp); + return (1); + } + if (sbavail(&so->so_snd)) { + if (bbr_progress_timeout_check(bbr)) { + ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + } + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); +} + + +/* + * Return value of 1, the TCB is unlocked and most + * likely gone, return value of 0, the TCB is still + * locked. + */ +static int +bbr_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, + uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) +{ + int32_t ourfinisacked = 0; + int32_t ret_val; + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + ctf_calc_rwin(so, tp); + /* Reset receive buffer auto scaling when not in bulk receive mode. */ + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); + + /* + * RFC5961 Section 4.2 Send challenge ACK for any SYN in + * synchronized state. + */ + if (thflags & TH_SYN) { + ctf_challenge_ack(m, th, tp, &ret_val); + return (ret_val); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + /* + * RFC 1323 PAWS: If we have a timestamp reply on this segment and + * it's less than ts_recent, drop it. + */ + if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && + TSTMP_LT(to->to_tsval, tp->ts_recent)) { + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) + return (ret_val); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + return (ret_val); + } + /* + * If new data are received on a connection after the user processes + * are gone, then we may RST the other end depending on the outcome + * of bbr_check_data_after_close. + */ + if ((so->so_state & SS_NOFDREF) && + tlen) { + /* + * We call a new function now so we might continue and setup + * to reset at all data being ack'd. + */ + if (bbr_check_data_after_close(m, bbr, tp, &tlen, th, so)) + return (1); + } + INP_WLOCK_ASSERT(tp->t_inpcb); + /* + * If last ACK falls within this segment's sequence numbers, record + * its timestamp. NOTE: 1) That the test incorporates suggestions + * from the latest proposal of the tcplw@cray.com list (Braden + * 1993/04/26). 2) That updating only on newer timestamps interferes + * with our earlier PAWS tests, so this check should be solely + * predicated on the sequence space of this segment. 3) That we + * modify the segment boundary check to be Last.ACK.Sent <= SEG.SEQ + * + SEG.Len instead of RFC1323's Last.ACK.Sent < SEG.SEQ + + * SEG.Len, This modified check allows us to overcome RFC1323's + * limitations as described in Stevens TCP/IP Illustrated Vol. 2 + * p.869. In such cases, we can still calculate the RTT correctly + * when RCV.NXT == Last.ACK.Sent. + */ + INP_WLOCK_ASSERT(tp->t_inpcb); + if ((to->to_flags & TOF_TS) != 0 && + SEQ_LEQ(th->th_seq, tp->last_ack_sent) && + SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen + + ((thflags & (TH_SYN | TH_FIN)) != 0))) { + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + tp->ts_recent = to->to_tsval; + } + /* + * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag + * is on (half-synchronized state), then queue data for later + * processing; else drop segment and return. + */ + if ((thflags & TH_ACK) == 0) { + if (tp->t_flags & TF_NEEDSYN) { + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); + } else if (tp->t_flags & TF_ACKNOW) { + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + bbr->r_wanted_output = 1; + return (ret_val); + } else { + ctf_do_drop(m, NULL); + return (0); + } + } + /* + * Ack processing. + */ + INP_WLOCK_ASSERT(tp->t_inpcb); + if (bbr_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { + return (ret_val); + } + if (sbavail(&so->so_snd)) { + if (bbr_progress_timeout_check(bbr)) { + ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + } + INP_WLOCK_ASSERT(tp->t_inpcb); + return (bbr_process_data(m, th, so, tp, drop_hdrlen, tlen, + tiwin, thflags, nxt_pkt)); +} + +static void +bbr_stop_all_timers(struct tcpcb *tp) +{ + struct tcp_bbr *bbr; + + /* + * Assure no timers are running. + */ + if (tcp_timer_active(tp, TT_PERSIST)) { + /* We enter in persists, set the flag appropriately */ + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + bbr->rc_in_persist = 1; + } + tcp_timer_suspend(tp, TT_PERSIST); + tcp_timer_suspend(tp, TT_REXMT); + tcp_timer_suspend(tp, TT_KEEP); + tcp_timer_suspend(tp, TT_DELACK); +} + +static void +bbr_google_mode_on(struct tcp_bbr *bbr) +{ + bbr->rc_use_google = 1; + bbr->rc_no_pacing = 0; + bbr->r_ctl.bbr_google_discount = bbr_google_discount; + bbr->r_use_policer = bbr_policer_detection_enabled; + bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10); + bbr->bbr_use_rack_cheat = 0; + bbr->r_ctl.rc_incr_tmrs = 0; + bbr->r_ctl.rc_inc_tcp_oh = 0; + bbr->r_ctl.rc_inc_ip_oh = 0; + bbr->r_ctl.rc_inc_enet_oh = 0; + reset_time(&bbr->r_ctl.rc_delrate, + BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT); + reset_time_small(&bbr->r_ctl.rc_rttprop, + (11 * USECS_IN_SECOND)); + tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv)); +} + +static void +bbr_google_mode_off(struct tcp_bbr *bbr) +{ + bbr->rc_use_google = 0; + bbr->r_ctl.bbr_google_discount = 0; + bbr->no_pacing_until = bbr_no_pacing_until; + bbr->r_use_policer = 0; + if (bbr->no_pacing_until) + bbr->rc_no_pacing = 1; + else + bbr->rc_no_pacing = 0; + if (bbr_use_rack_resend_cheat) + bbr->bbr_use_rack_cheat = 1; + else + bbr->bbr_use_rack_cheat = 0; + if (bbr_incr_timers) + bbr->r_ctl.rc_incr_tmrs = 1; + else + bbr->r_ctl.rc_incr_tmrs = 0; + if (bbr_include_tcp_oh) + bbr->r_ctl.rc_inc_tcp_oh = 1; + else + bbr->r_ctl.rc_inc_tcp_oh = 0; + if (bbr_include_ip_oh) + bbr->r_ctl.rc_inc_ip_oh = 1; + else + bbr->r_ctl.rc_inc_ip_oh = 0; + if (bbr_include_enet_oh) + bbr->r_ctl.rc_inc_enet_oh = 1; + else + bbr->r_ctl.rc_inc_enet_oh = 0; + bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; + reset_time(&bbr->r_ctl.rc_delrate, + bbr_num_pktepo_for_del_limit); + reset_time_small(&bbr->r_ctl.rc_rttprop, + (bbr_filter_len_sec * USECS_IN_SECOND)); + tcp_bbr_tso_size_check(bbr, tcp_get_usecs(&bbr->rc_tv)); +} +/* + * Return 0 on success, non-zero on failure + * which indicates the error (usually no memory). + */ +static int +bbr_init(struct tcpcb *tp) +{ + struct tcp_bbr *bbr = NULL; + struct inpcb *inp; + uint32_t cts; + + tp->t_fb_ptr = uma_zalloc(bbr_pcb_zone, (M_NOWAIT | M_ZERO)); + if (tp->t_fb_ptr == NULL) { + /* + * We need to allocate memory but cant. The INP and INP_INFO + * locks and they are recusive (happens during setup. So a + * scheme to drop the locks fails :( + * + */ + return (ENOMEM); + } + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + bbr->rtt_valid = 0; + inp = tp->t_inpcb; + inp->inp_flags2 |= INP_CANNOT_DO_ECN; + inp->inp_flags2 |= INP_SUPPORTS_MBUFQ; + TAILQ_INIT(&bbr->r_ctl.rc_map); + TAILQ_INIT(&bbr->r_ctl.rc_free); + TAILQ_INIT(&bbr->r_ctl.rc_tmap); + bbr->rc_tp = tp; + if (tp->t_inpcb) { + bbr->rc_inp = tp->t_inpcb; + } + cts = tcp_get_usecs(&bbr->rc_tv); + tp->t_acktime = 0; + bbr->rc_allow_data_af_clo = bbr_ignore_data_after_close; + bbr->r_ctl.rc_reorder_fade = bbr_reorder_fade; + bbr->rc_tlp_threshold = bbr_tlp_thresh; + bbr->r_ctl.rc_reorder_shift = bbr_reorder_thresh; + bbr->r_ctl.rc_pkt_delay = bbr_pkt_delay; + bbr->r_ctl.rc_min_to = bbr_min_to; + bbr->rc_bbr_state = BBR_STATE_STARTUP; + bbr->r_ctl.bbr_lost_at_state = 0; + bbr->r_ctl.rc_lost_at_startup = 0; + bbr->rc_all_timers_stopped = 0; + bbr->r_ctl.rc_bbr_lastbtlbw = 0; + bbr->r_ctl.rc_pkt_epoch_del = 0; + bbr->r_ctl.rc_pkt_epoch = 0; + bbr->r_ctl.rc_lowest_rtt = 0xffffffff; + bbr->r_ctl.rc_bbr_hptsi_gain = bbr_high_gain; + bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain; + bbr->r_ctl.rc_went_idle_time = cts; + bbr->rc_pacer_started = cts; + bbr->r_ctl.rc_pkt_epoch_time = cts; + bbr->r_ctl.rc_rcvtime = cts; + bbr->r_ctl.rc_bbr_state_time = cts; + bbr->r_ctl.rc_del_time = cts; + bbr->r_ctl.rc_tlp_rxt_last_time = cts; + bbr->r_ctl.last_in_probertt = cts; + bbr->skip_gain = 0; + bbr->gain_is_limited = 0; + bbr->no_pacing_until = bbr_no_pacing_until; + if (bbr->no_pacing_until) + bbr->rc_no_pacing = 1; + if (bbr_use_google_algo) { + bbr->rc_no_pacing = 0; + bbr->rc_use_google = 1; + bbr->r_ctl.bbr_google_discount = bbr_google_discount; + bbr->r_use_policer = bbr_policer_detection_enabled; + } else { + bbr->rc_use_google = 0; + bbr->r_ctl.bbr_google_discount = 0; + bbr->r_use_policer = 0; + } + if (bbr_ts_limiting) + bbr->rc_use_ts_limit = 1; + else + bbr->rc_use_ts_limit = 0; + if (bbr_ts_can_raise) + bbr->ts_can_raise = 1; + else + bbr->ts_can_raise = 0; + if (V_tcp_delack_enabled == 1) + tp->t_delayed_ack = 2; + else if (V_tcp_delack_enabled == 0) + tp->t_delayed_ack = 0; + else if (V_tcp_delack_enabled < 100) + tp->t_delayed_ack = V_tcp_delack_enabled; + else + tp->t_delayed_ack = 2; + if (bbr->rc_use_google == 0) + bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; + else + bbr->r_ctl.rc_probertt_int = (USECS_IN_SECOND * 10); + bbr->r_ctl.rc_min_rto_ms = bbr_rto_min_ms; + bbr->rc_max_rto_sec = bbr_rto_max_sec; + bbr->rc_init_win = bbr_def_init_win; + if (tp->t_flags & TF_REQ_TSTMP) + bbr->rc_last_options = TCP_TS_OVERHEAD; + bbr->r_ctl.rc_pace_max_segs = tp->t_maxseg - bbr->rc_last_options; + bbr->r_ctl.rc_high_rwnd = tp->snd_wnd; + bbr->r_init_rtt = 1; + + counter_u64_add(bbr_flows_nohdwr_pacing, 1); + if (bbr_allow_hdwr_pacing) + bbr->bbr_hdw_pace_ena = 1; + else + bbr->bbr_hdw_pace_ena = 0; + if (bbr_sends_full_iwnd) + bbr->bbr_init_win_cheat = 1; + else + bbr->bbr_init_win_cheat = 0; + bbr->r_ctl.bbr_utter_max = bbr_hptsi_utter_max; + bbr->r_ctl.rc_drain_pg = bbr_drain_gain; + bbr->r_ctl.rc_startup_pg = bbr_high_gain; + bbr->rc_loss_exit = bbr_exit_startup_at_loss; + bbr->r_ctl.bbr_rttprobe_gain_val = bbr_rttprobe_gain; + bbr->r_ctl.bbr_hptsi_per_second = bbr_hptsi_per_second; + bbr->r_ctl.bbr_hptsi_segments_delay_tar = bbr_hptsi_segments_delay_tar; + bbr->r_ctl.bbr_hptsi_segments_max = bbr_hptsi_segments_max; + bbr->r_ctl.bbr_hptsi_segments_floor = bbr_hptsi_segments_floor; + bbr->r_ctl.bbr_hptsi_bytes_min = bbr_hptsi_bytes_min; + bbr->r_ctl.bbr_cross_over = bbr_cross_over; + bbr->r_ctl.rc_rtt_shrinks = cts; + if (bbr->rc_use_google) { + setup_time_filter(&bbr->r_ctl.rc_delrate, + FILTER_TYPE_MAX, + BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT); + setup_time_filter_small(&bbr->r_ctl.rc_rttprop, + FILTER_TYPE_MIN, (11 * USECS_IN_SECOND)); + } else { + setup_time_filter(&bbr->r_ctl.rc_delrate, + FILTER_TYPE_MAX, + bbr_num_pktepo_for_del_limit); + setup_time_filter_small(&bbr->r_ctl.rc_rttprop, + FILTER_TYPE_MIN, (bbr_filter_len_sec * USECS_IN_SECOND)); + } + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_INIT, 0); + if (bbr_uses_idle_restart) + bbr->rc_use_idle_restart = 1; + else + bbr->rc_use_idle_restart = 0; + bbr->r_ctl.rc_bbr_cur_del_rate = 0; + bbr->r_ctl.rc_initial_hptsi_bw = bbr_initial_bw_bps; + if (bbr_resends_use_tso) + bbr->rc_resends_use_tso = 1; +#ifdef NETFLIX_PEAKRATE + tp->t_peakrate_thr = tp->t_maxpeakrate; +#endif + if (tp->snd_una != tp->snd_max) { + /* Create a send map for the current outstanding data */ + struct bbr_sendmap *rsm; + + rsm = bbr_alloc(bbr); + if (rsm == NULL) { + uma_zfree(bbr_pcb_zone, tp->t_fb_ptr); + tp->t_fb_ptr = NULL; + return (ENOMEM); + } + rsm->r_flags = BBR_OVERMAX; + rsm->r_tim_lastsent[0] = cts; + rsm->r_rtr_cnt = 1; + rsm->r_rtr_bytes = 0; + rsm->r_start = tp->snd_una; + rsm->r_end = tp->snd_max; + rsm->r_dupack = 0; + rsm->r_delivered = bbr->r_ctl.rc_delivered; + rsm->r_ts_valid = 0; + rsm->r_del_ack_ts = tp->ts_recent; + rsm->r_del_time = cts; + if (bbr->r_ctl.r_app_limited_until) + rsm->r_app_limited = 1; + else + rsm->r_app_limited = 0; + TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_map, rsm, r_next); + TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 1; + if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) + rsm->r_bbr_state = bbr_state_val(bbr); + else + rsm->r_bbr_state = 8; + } + if (bbr_use_rack_resend_cheat && (bbr->rc_use_google == 0)) + bbr->bbr_use_rack_cheat = 1; + if (bbr_incr_timers && (bbr->rc_use_google == 0)) + bbr->r_ctl.rc_incr_tmrs = 1; + if (bbr_include_tcp_oh && (bbr->rc_use_google == 0)) + bbr->r_ctl.rc_inc_tcp_oh = 1; + if (bbr_include_ip_oh && (bbr->rc_use_google == 0)) + bbr->r_ctl.rc_inc_ip_oh = 1; + if (bbr_include_enet_oh && (bbr->rc_use_google == 0)) + bbr->r_ctl.rc_inc_enet_oh = 1; + + bbr_log_type_statechange(bbr, cts, __LINE__); + if (TCPS_HAVEESTABLISHED(tp->t_state) && + (tp->t_srtt)) { + uint32_t rtt; + + rtt = (TICKS_2_USEC(tp->t_srtt) >> TCP_RTT_SHIFT); + apply_filter_min_small(&bbr->r_ctl.rc_rttprop, rtt, cts); + } + /* announce the settings and state */ + bbr_log_settings_change(bbr, BBR_RECOVERY_LOWRTT); + tcp_bbr_tso_size_check(bbr, cts); + /* + * Now call the generic function to start a timer. This will place + * the TCB on the hptsi wheel if a timer is needed with appropriate + * flags. + */ + bbr_stop_all_timers(tp); + bbr_start_hpts_timer(bbr, tp, cts, 5, 0, 0); + return (0); +} + +/* + * Return 0 if we can accept the connection. Return + * non-zero if we can't handle the connection. A EAGAIN + * means you need to wait until the connection is up. + * a EADDRNOTAVAIL means we can never handle the connection + * (no SACK). + */ +static int +bbr_handoff_ok(struct tcpcb *tp) +{ + if ((tp->t_state == TCPS_CLOSED) || + (tp->t_state == TCPS_LISTEN)) { + /* Sure no problem though it may not stick */ + return (0); + } + if ((tp->t_state == TCPS_SYN_SENT) || + (tp->t_state == TCPS_SYN_RECEIVED)) { + /* + * We really don't know you have to get to ESTAB or beyond + * to tell. + */ + return (EAGAIN); + } + if ((tp->t_flags & TF_SACK_PERMIT) || bbr_sack_not_required) { + return (0); + } + /* + * If we reach here we don't do SACK on this connection so we can + * never do rack. + */ + return (EINVAL); +} + +static void +bbr_fini(struct tcpcb *tp, int32_t tcb_is_purged) +{ + if (tp->t_fb_ptr) { + uint32_t calc; + struct tcp_bbr *bbr; + struct bbr_sendmap *rsm; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + if (bbr->r_ctl.crte) + tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp); + bbr_log_flowend(bbr); + bbr->rc_tp = NULL; + if (tp->t_inpcb) { + /* Backout any flags2 we applied */ + tp->t_inpcb->inp_flags2 &= ~INP_CANNOT_DO_ECN; + tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ; + tp->t_inpcb->inp_flags2 &= ~INP_MBUF_QUEUE_READY; + } + if (bbr->bbr_hdrw_pacing) + counter_u64_add(bbr_flows_whdwr_pacing, -1); + else + counter_u64_add(bbr_flows_nohdwr_pacing, -1); + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + while (rsm) { + TAILQ_REMOVE(&bbr->r_ctl.rc_map, rsm, r_next); + uma_zfree(bbr_zone, rsm); + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + } + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); + while (rsm) { + TAILQ_REMOVE(&bbr->r_ctl.rc_free, rsm, r_next); + uma_zfree(bbr_zone, rsm); + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_free); + } + calc = bbr->r_ctl.rc_high_rwnd - bbr->r_ctl.rc_init_rwnd; + if (calc > (bbr->r_ctl.rc_init_rwnd / 10)) + BBR_STAT_INC(bbr_dynamic_rwnd); + else + BBR_STAT_INC(bbr_static_rwnd); + bbr->r_ctl.rc_free_cnt = 0; + uma_zfree(bbr_pcb_zone, tp->t_fb_ptr); + tp->t_fb_ptr = NULL; + } + /* Make sure snd_nxt is correctly set */ + tp->snd_nxt = tp->snd_max; +} + +static void +bbr_set_state(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t win) +{ + switch (tp->t_state) { + case TCPS_SYN_SENT: + bbr->r_state = TCPS_SYN_SENT; + bbr->r_substate = bbr_do_syn_sent; + break; + case TCPS_SYN_RECEIVED: + bbr->r_state = TCPS_SYN_RECEIVED; + bbr->r_substate = bbr_do_syn_recv; + break; + case TCPS_ESTABLISHED: + bbr->r_ctl.rc_init_rwnd = max(win, bbr->rc_tp->snd_wnd); + bbr->r_state = TCPS_ESTABLISHED; + bbr->r_substate = bbr_do_established; + break; + case TCPS_CLOSE_WAIT: + bbr->r_state = TCPS_CLOSE_WAIT; + bbr->r_substate = bbr_do_close_wait; + break; + case TCPS_FIN_WAIT_1: + bbr->r_state = TCPS_FIN_WAIT_1; + bbr->r_substate = bbr_do_fin_wait_1; + break; + case TCPS_CLOSING: + bbr->r_state = TCPS_CLOSING; + bbr->r_substate = bbr_do_closing; + break; + case TCPS_LAST_ACK: + bbr->r_state = TCPS_LAST_ACK; + bbr->r_substate = bbr_do_lastack; + break; + case TCPS_FIN_WAIT_2: + bbr->r_state = TCPS_FIN_WAIT_2; + bbr->r_substate = bbr_do_fin_wait_2; + break; + case TCPS_LISTEN: + case TCPS_CLOSED: + case TCPS_TIME_WAIT: + default: + break; + }; +} + +static void +bbr_substate_change(struct tcp_bbr *bbr, uint32_t cts, int32_t line, int dolog) +{ + /* + * Now what state are we going into now? Is there adjustments + * needed? + */ + int32_t old_state, old_gain; + + + old_state = bbr_state_val(bbr); + old_gain = bbr->r_ctl.rc_bbr_hptsi_gain; + if (bbr_state_val(bbr) == BBR_SUB_LEVEL1) { + /* Save the lowest srtt we saw in our end of the sub-state */ + bbr->rc_hit_state_1 = 0; + if (bbr->r_ctl.bbr_smallest_srtt_this_state != 0xffffffff) + bbr->r_ctl.bbr_smallest_srtt_state2 = bbr->r_ctl.bbr_smallest_srtt_this_state; + } + bbr->rc_bbr_substate++; + if (bbr->rc_bbr_substate >= BBR_SUBSTATE_COUNT) { + /* Cycle back to first state-> gain */ + bbr->rc_bbr_substate = 0; + } + if (bbr_state_val(bbr) == BBR_SUB_GAIN) { + /* + * We enter the gain(5/4) cycle (possibly less if + * shallow buffer detection is enabled) + */ + if (bbr->skip_gain) { + /* + * Hardware pacing has set our rate to + * the max and limited our b/w just + * do level i.e. no gain. + */ + bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_LEVEL1]; + } else if (bbr->gain_is_limited && + bbr->bbr_hdrw_pacing && + bbr->r_ctl.crte) { + /* + * We can't gain above the hardware pacing + * rate which is less than our rate + the gain + * calculate the gain needed to reach the hardware + * pacing rate.. + */ + uint64_t bw, rate, gain_calc; + + bw = bbr_get_bw(bbr); + rate = bbr->r_ctl.crte->rate; + if ((rate > bw) && + (((bw * (uint64_t)bbr_hptsi_gain[BBR_SUB_GAIN]) / (uint64_t)BBR_UNIT) > rate)) { + gain_calc = (rate * BBR_UNIT) / bw; + if (gain_calc < BBR_UNIT) + gain_calc = BBR_UNIT; + bbr->r_ctl.rc_bbr_hptsi_gain = (uint16_t)gain_calc; + } else { + bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN]; + } + } else + bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_GAIN]; + if ((bbr->rc_use_google == 0) && (bbr_gain_to_target == 0)) { + bbr->r_ctl.rc_bbr_state_atflight = cts; + } else + bbr->r_ctl.rc_bbr_state_atflight = 0; + } else if (bbr_state_val(bbr) == BBR_SUB_DRAIN) { + bbr->rc_hit_state_1 = 1; + bbr->r_ctl.rc_exta_time_gd = 0; + bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + if (bbr_state_drain_2_tar) { + bbr->r_ctl.rc_bbr_state_atflight = 0; + } else + bbr->r_ctl.rc_bbr_state_atflight = cts; + bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[BBR_SUB_DRAIN]; + } else { + /* All other cycles hit here 2-7 */ + if ((old_state == BBR_SUB_DRAIN) && bbr->rc_hit_state_1) { + if (bbr_sub_drain_slam_cwnd && + (bbr->rc_use_google == 0) && + (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { + bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + if ((cts - bbr->r_ctl.rc_bbr_state_time) > bbr_get_rtt(bbr, BBR_RTT_PROP)) + bbr->r_ctl.rc_exta_time_gd += ((cts - bbr->r_ctl.rc_bbr_state_time) - + bbr_get_rtt(bbr, BBR_RTT_PROP)); + else + bbr->r_ctl.rc_exta_time_gd = 0; + if (bbr->r_ctl.rc_exta_time_gd) { + bbr->r_ctl.rc_level_state_extra = bbr->r_ctl.rc_exta_time_gd; + /* Now chop up the time for each state (div by 7) */ + bbr->r_ctl.rc_level_state_extra /= 7; + if (bbr_rand_ot && bbr->r_ctl.rc_level_state_extra) { + /* Add a randomization */ + bbr_randomize_extra_state_time(bbr); + } + } + } + bbr->r_ctl.rc_bbr_state_atflight = max(1, cts); + bbr->r_ctl.rc_bbr_hptsi_gain = bbr_hptsi_gain[bbr_state_val(bbr)]; + } + if (bbr->rc_use_google) { + bbr->r_ctl.rc_bbr_state_atflight = max(1, cts); + } + bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; + bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain; + if (dolog) + bbr_log_type_statechange(bbr, cts, line); + + if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { + uint32_t time_in; + + time_in = cts - bbr->r_ctl.rc_bbr_state_time; + if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { + counter_u64_add(bbr_state_time[(old_state + 5)], time_in); + } else { + counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); + } + } + bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff; + bbr_set_state_target(bbr, __LINE__); + if (bbr_sub_drain_slam_cwnd && + (bbr->rc_use_google == 0) && + (bbr_state_val(bbr) == BBR_SUB_DRAIN)) { + /* Slam down the cwnd */ + bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; + bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; + if (bbr_sub_drain_app_limit) { + /* Go app limited if we are on a long drain */ + bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + + ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes))); + } + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + if (bbr->rc_lt_use_bw) { + /* In policed mode we clamp pacing_gain to BBR_UNIT */ + bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; + } + /* Google changes TSO size every cycle */ + if (bbr->rc_use_google) + tcp_bbr_tso_size_check(bbr, cts); + bbr->r_ctl.gain_epoch = cts; + bbr->r_ctl.rc_bbr_state_time = cts; + bbr->r_ctl.substate_pe = bbr->r_ctl.rc_pkt_epoch; +} + +static void +bbr_set_probebw_google_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses) +{ + if ((bbr_state_val(bbr) == BBR_SUB_DRAIN) && + (google_allow_early_out == 1) && + (bbr->r_ctl.rc_flight_at_input <= bbr->r_ctl.rc_target_at_state)) { + /* We have reached out target flight size possibly early */ + goto change_state; + } + if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) { + return; + } + if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_get_rtt(bbr, BBR_RTT_PROP)) { + /* + * Must be a rttProp movement forward before + * we can change states. + */ + return; + } + if (bbr_state_val(bbr) == BBR_SUB_GAIN) { + /* + * The needed time has passed but for + * the gain cycle extra rules apply: + * 1) If we have seen loss, we exit + * 2) If we have not reached the target + * we stay in GAIN (gain-to-target). + */ + if (google_consider_lost && losses) + goto change_state; + if (bbr->r_ctl.rc_target_at_state > bbr->r_ctl.rc_flight_at_input) { + return; + } + } +change_state: + /* For gain we must reach our target, all others last 1 rttProp */ + bbr_substate_change(bbr, cts, __LINE__, 1); +} + +static void +bbr_set_probebw_gains(struct tcp_bbr *bbr, uint32_t cts, uint32_t losses) +{ + uint32_t flight, bbr_cur_cycle_time; + + if (bbr->rc_use_google) { + bbr_set_probebw_google_gains(bbr, cts, losses); + return; + } + if (cts == 0) { + /* + * Never alow cts to be 0 we + * do this so we can judge if + * we have set a timestamp. + */ + cts = 1; + } + if (bbr_state_is_pkt_epoch) + bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PKTRTT); + else + bbr_cur_cycle_time = bbr_get_rtt(bbr, BBR_RTT_PROP); + + if (bbr->r_ctl.rc_bbr_state_atflight == 0) { + if (bbr_state_val(bbr) == BBR_SUB_DRAIN) { + flight = ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + if (bbr_sub_drain_slam_cwnd && bbr->rc_hit_state_1) { + /* Keep it slam down */ + if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state) { + bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + if (bbr_sub_drain_app_limit) { + /* Go app limited if we are on a long drain */ + bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.rc_delivered + flight); + } + } + if (TSTMP_GT(cts, bbr->r_ctl.gain_epoch) && + (((cts - bbr->r_ctl.gain_epoch) > bbr_get_rtt(bbr, BBR_RTT_PROP)) || + (flight >= bbr->r_ctl.flightsize_at_drain))) { + /* + * Still here after the same time as + * the gain. We need to drain harder + * for the next srtt. Reduce by a set amount + * the gain drop is capped at DRAIN states + * value (88). + */ + bbr->r_ctl.flightsize_at_drain = flight; + if (bbr_drain_drop_mul && + bbr_drain_drop_div && + (bbr_drain_drop_mul < bbr_drain_drop_div)) { + /* Use your specific drop value (def 4/5 = 20%) */ + bbr->r_ctl.rc_bbr_hptsi_gain *= bbr_drain_drop_mul; + bbr->r_ctl.rc_bbr_hptsi_gain /= bbr_drain_drop_div; + } else { + /* You get drop of 20% */ + bbr->r_ctl.rc_bbr_hptsi_gain *= 4; + bbr->r_ctl.rc_bbr_hptsi_gain /= 5; + } + if (bbr->r_ctl.rc_bbr_hptsi_gain <= bbr_drain_floor) { + /* Reduce our gain again to the bottom */ + bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1); + } + bbr_log_exit_gain(bbr, cts, 4); + /* + * Extend out so we wait another + * epoch before dropping again. + */ + bbr->r_ctl.gain_epoch = cts; + } + if (flight <= bbr->r_ctl.rc_target_at_state) { + if (bbr_sub_drain_slam_cwnd && + (bbr->rc_use_google == 0) && + (bbr->rc_tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { + bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); + bbr_log_exit_gain(bbr, cts, 3); + } + } else { + /* Its a gain */ + if (bbr->r_ctl.rc_lost > bbr->r_ctl.bbr_lost_at_state) { + bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); + goto change_state; + } + if ((ctf_outstanding(bbr->rc_tp) >= bbr->r_ctl.rc_target_at_state) || + ((ctf_outstanding(bbr->rc_tp) + bbr->rc_tp->t_maxseg - 1) >= + bbr->rc_tp->snd_wnd)) { + bbr->r_ctl.rc_bbr_state_atflight = max(cts, 1); + bbr_log_exit_gain(bbr, cts, 2); + } + } + /** + * We fall through and return always one of two things has + * occured. + * 1) We are still not at target + * <or> + * 2) We reached the target and set rc_bbr_state_atflight + * which means we no longer hit this block + * next time we are called. + */ + return; + } +change_state: + if (TSTMP_LT(cts, bbr->r_ctl.rc_bbr_state_time)) + return; + if ((cts - bbr->r_ctl.rc_bbr_state_time) < bbr_cur_cycle_time) { + /* Less than a full time-period has passed */ + return; + } + if (bbr->r_ctl.rc_level_state_extra && + (bbr_state_val(bbr) > BBR_SUB_DRAIN) && + ((cts - bbr->r_ctl.rc_bbr_state_time) < + (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) { + /* Less than a full time-period + extra has passed */ + return; + } + if (bbr_gain_gets_extra_too && + bbr->r_ctl.rc_level_state_extra && + (bbr_state_val(bbr) == BBR_SUB_GAIN) && + ((cts - bbr->r_ctl.rc_bbr_state_time) < + (bbr_cur_cycle_time + bbr->r_ctl.rc_level_state_extra))) { + /* Less than a full time-period + extra has passed */ + return; + } + bbr_substate_change(bbr, cts, __LINE__, 1); +} + +static uint32_t +bbr_get_a_state_target(struct tcp_bbr *bbr, uint32_t gain) +{ + uint32_t mss, tar; + + if (bbr->rc_use_google) { + /* Google just uses the cwnd target */ + tar = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), gain); + } else { + mss = min((bbr->rc_tp->t_maxseg - bbr->rc_last_options), + bbr->r_ctl.rc_pace_max_segs); + /* Get the base cwnd with gain rounded to a mss */ + tar = roundup(bbr_get_raw_target_cwnd(bbr, bbr_get_bw(bbr), + gain), mss); + /* Make sure it is within our min */ + if (tar < get_min_cwnd(bbr)) + return (get_min_cwnd(bbr)); + } + return (tar); +} + +static void +bbr_set_state_target(struct tcp_bbr *bbr, int line) +{ + uint32_t tar, meth; + + if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) && + ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) { + /* Special case using old probe-rtt method */ + tar = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); + meth = 1; + } else { + /* Non-probe-rtt case and reduced probe-rtt */ + if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) && + (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT)) { + /* For gain cycle we use the hptsi gain */ + tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain); + meth = 2; + } else if ((bbr_target_is_bbunit) || bbr->rc_use_google) { + /* + * If configured, or for google all other states + * get BBR_UNIT. + */ + tar = bbr_get_a_state_target(bbr, BBR_UNIT); + meth = 3; + } else { + /* + * Or we set a target based on the pacing gain + * for non-google mode and default (non-configured). + * Note we don't set a target goal below drain (192). + */ + if (bbr->r_ctl.rc_bbr_hptsi_gain < bbr_hptsi_gain[BBR_SUB_DRAIN]) { + tar = bbr_get_a_state_target(bbr, bbr_hptsi_gain[BBR_SUB_DRAIN]); + meth = 4; + } else { + tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain); + meth = 5; + } + } + } + bbr_log_set_of_state_target(bbr, tar, line, meth); + bbr->r_ctl.rc_target_at_state = tar; +} + +static void +bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line) +{ + /* Change to probe_rtt */ + uint32_t time_in; + + bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; + bbr->r_ctl.flightsize_at_drain = ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + bbr->r_ctl.r_app_limited_until = (bbr->r_ctl.flightsize_at_drain + + bbr->r_ctl.rc_delivered); + /* Setup so we force feed the filter */ + if (bbr->rc_use_google || bbr_probertt_sets_rtt) + bbr->rc_prtt_set_ts = 1; + if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { + time_in = cts - bbr->r_ctl.rc_bbr_state_time; + counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); + } + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_ENTERPROBE, 0); + bbr->r_ctl.rc_rtt_shrinks = cts; + bbr->r_ctl.last_in_probertt = cts; + bbr->r_ctl.rc_probertt_srttchktim = cts; + bbr->r_ctl.rc_bbr_state_time = cts; + bbr->rc_bbr_state = BBR_STATE_PROBE_RTT; + /* We need to force the filter to update */ + + if ((bbr_sub_drain_slam_cwnd) && + bbr->rc_hit_state_1 && + (bbr->rc_use_google == 0) && + (bbr_state_val(bbr) == BBR_SUB_DRAIN)) { + if (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_saved_cwnd) + bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; + } else + bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; + /* Update the lost */ + bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; + if ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google){ + /* Set to the non-configurable default of 4 (PROBE_RTT_MIN) */ + bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; + bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; + bbr_log_set_of_state_target(bbr, bbr->rc_tp->snd_cwnd, __LINE__, 6); + bbr->r_ctl.rc_target_at_state = bbr->rc_tp->snd_cwnd; + } else { + /* + * We bring it down slowly by using a hptsi gain that is + * probably 75%. This will slowly float down our outstanding + * without tampering with the cwnd. + */ + bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val; + bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; + bbr_set_state_target(bbr, __LINE__); + if (bbr_prtt_slam_cwnd && + (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { + bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + } + if (ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= + bbr->r_ctl.rc_target_at_state) { + /* We are at target */ + bbr->r_ctl.rc_bbr_enters_probertt = cts; + } else { + /* We need to come down to reach target before our time begins */ + bbr->r_ctl.rc_bbr_enters_probertt = 0; + } + bbr->r_ctl.rc_pe_of_prtt = bbr->r_ctl.rc_pkt_epoch; + BBR_STAT_INC(bbr_enter_probertt); + bbr_log_exit_gain(bbr, cts, 0); + bbr_log_type_statechange(bbr, cts, line); +} + +static void +bbr_check_probe_rtt_limits(struct tcp_bbr *bbr, uint32_t cts) +{ + /* + * Sanity check on probe-rtt intervals. + * In crazy situations where we are competing + * against new-reno flows with huge buffers + * our rtt-prop interval could come to dominate + * things if we can't get through a full set + * of cycles, we need to adjust it. + */ + if (bbr_can_adjust_probertt && + (bbr->rc_use_google == 0)) { + uint16_t val = 0; + uint32_t cur_rttp, fval, newval, baseval; + + /* Are we to small and go into probe-rtt to often? */ + baseval = (bbr_get_rtt(bbr, BBR_RTT_PROP) * (BBR_SUBSTATE_COUNT + 1)); + cur_rttp = roundup(baseval, USECS_IN_SECOND); + fval = bbr_filter_len_sec * USECS_IN_SECOND; + if (bbr_is_ratio == 0) { + if (fval > bbr_rtt_probe_limit) + newval = cur_rttp + (fval - bbr_rtt_probe_limit); + else + newval = cur_rttp; + } else { + int mul; + + mul = fval / bbr_rtt_probe_limit; + newval = cur_rttp * mul; + } + if (cur_rttp > bbr->r_ctl.rc_probertt_int) { + bbr->r_ctl.rc_probertt_int = cur_rttp; + reset_time_small(&bbr->r_ctl.rc_rttprop, newval); + val = 1; + } else { + /* + * No adjustments were made + * do we need to shrink it? + */ + if (bbr->r_ctl.rc_probertt_int > bbr_rtt_probe_limit) { + if (cur_rttp <= bbr_rtt_probe_limit) { + /* + * Things have calmed down lets + * shrink all the way to default + */ + bbr->r_ctl.rc_probertt_int = bbr_rtt_probe_limit; + reset_time_small(&bbr->r_ctl.rc_rttprop, + (bbr_filter_len_sec * USECS_IN_SECOND)); + cur_rttp = bbr_rtt_probe_limit; + newval = (bbr_filter_len_sec * USECS_IN_SECOND); + val = 2; + } else { + /* + * Well does some adjustment make sense? + */ + if (cur_rttp < bbr->r_ctl.rc_probertt_int) { + /* We can reduce interval time some */ + bbr->r_ctl.rc_probertt_int = cur_rttp; + reset_time_small(&bbr->r_ctl.rc_rttprop, newval); + val = 3; + } + } + } + } + if (val) + bbr_log_rtt_shrinks(bbr, cts, cur_rttp, newval, __LINE__, BBR_RTTS_RESETS_VALUES, val); + } +} + +static void +bbr_exit_probe_rtt(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t cts) +{ + /* Exit probe-rtt */ + + if (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd) { + tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + bbr_log_exit_gain(bbr, cts, 1); + bbr->rc_hit_state_1 = 0; + bbr->r_ctl.rc_rtt_shrinks = cts; + bbr->r_ctl.last_in_probertt = cts; + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_RTTPROBE, 0); + bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; + bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + + bbr->r_ctl.rc_delivered); + if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { + uint32_t time_in; + + time_in = cts - bbr->r_ctl.rc_bbr_state_time; + counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); + } + if (bbr->rc_filled_pipe) { + /* Switch to probe_bw */ + bbr->rc_bbr_state = BBR_STATE_PROBE_BW; + bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); + bbr->r_ctl.rc_bbr_cwnd_gain = bbr_cwnd_gain; + bbr_substate_change(bbr, cts, __LINE__, 0); + bbr_log_type_statechange(bbr, cts, __LINE__); + } else { + /* Back to startup */ + bbr->rc_bbr_state = BBR_STATE_STARTUP; + bbr->r_ctl.rc_bbr_state_time = cts; + /* + * We don't want to give a complete free 3 + * measurements until we exit, so we use + * the number of pe's we were in probe-rtt + * to add to the startup_epoch. That way + * we will still retain the old state. + */ + bbr->r_ctl.rc_bbr_last_startup_epoch += (bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_pe_of_prtt); + bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; + /* Make sure to use the lower pg when shifting back in */ + if (bbr->r_ctl.rc_lost && + bbr_use_lower_gain_in_startup && + (bbr->rc_use_google == 0)) + bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower; + else + bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_startup_pg; + bbr->r_ctl.rc_bbr_cwnd_gain = bbr->r_ctl.rc_startup_pg; + /* Probably not needed but set it anyway */ + bbr_set_state_target(bbr, __LINE__); + bbr_log_type_statechange(bbr, cts, __LINE__); + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 0); + } + bbr_check_probe_rtt_limits(bbr, cts); +} + +static int32_t inline +bbr_should_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts) +{ + if ((bbr->rc_past_init_win == 1) && + (bbr->rc_in_persist == 0) && + (bbr_calc_time(cts, bbr->r_ctl.rc_rtt_shrinks) >= bbr->r_ctl.rc_probertt_int)) { + return (1); + } + if (bbr_can_force_probertt && + (bbr->rc_in_persist == 0) && + (TSTMP_GT(cts, bbr->r_ctl.last_in_probertt)) && + ((cts - bbr->r_ctl.last_in_probertt) > bbr->r_ctl.rc_probertt_int)) { + return (1); + } + return (0); +} + + +static int32_t +bbr_google_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t pkt_epoch) +{ + uint64_t btlbw, gain; + if (pkt_epoch == 0) { + /* + * Need to be on a pkt-epoch to continue. + */ + return (0); + } + btlbw = bbr_get_full_bw(bbr); + gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * + (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; + if (btlbw >= gain) { + bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch; + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3); + bbr->r_ctl.rc_bbr_lastbtlbw = btlbw; + } + if ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) + return (1); + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8); + return(0); +} + +static int32_t inline +bbr_state_startup(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch) +{ + /* Have we gained 25% in the last 3 packet based epoch's? */ + uint64_t btlbw, gain; + int do_exit; + int delta, rtt_gain; + + if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) && + (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { + /* + * This qualifies as a RTT_PROBE session since we drop the + * data outstanding to nothing and waited more than + * bbr_rtt_probe_time. + */ + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); + bbr_set_reduced_rtt(bbr, cts, __LINE__); + } + if (bbr_should_enter_probe_rtt(bbr, cts)) { + bbr_enter_probe_rtt(bbr, cts, __LINE__); + return (0); + } + if (bbr->rc_use_google) + return (bbr_google_startup(bbr, cts, pkt_epoch)); + + if ((bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) && + (bbr_use_lower_gain_in_startup)) { + /* Drop to a lower gain 1.5 x since we saw loss */ + bbr->r_ctl.rc_bbr_hptsi_gain = bbr_startup_lower; + } + if (pkt_epoch == 0) { + /* + * Need to be on a pkt-epoch to continue. + */ + return (0); + } + if (bbr_rtt_gain_thresh) { + /* + * Do we allow a flow to stay + * in startup with no loss and no + * gain in rtt over a set threshold? + */ + if (bbr->r_ctl.rc_pkt_epoch_rtt && + bbr->r_ctl.startup_last_srtt && + (bbr->r_ctl.rc_pkt_epoch_rtt > bbr->r_ctl.startup_last_srtt)) { + delta = bbr->r_ctl.rc_pkt_epoch_rtt - bbr->r_ctl.startup_last_srtt; + rtt_gain = (delta * 100) / bbr->r_ctl.startup_last_srtt; + } else + rtt_gain = 0; + if ((bbr->r_ctl.startup_last_srtt == 0) || + (bbr->r_ctl.rc_pkt_epoch_rtt < bbr->r_ctl.startup_last_srtt)) + /* First time or new lower value */ + bbr->r_ctl.startup_last_srtt = bbr->r_ctl.rc_pkt_epoch_rtt; + + if ((bbr->r_ctl.rc_lost == 0) && + (rtt_gain < bbr_rtt_gain_thresh)) { + /* + * No loss, and we are under + * our gain threhold for + * increasing RTT. + */ + if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch) + bbr->r_ctl.rc_bbr_last_startup_epoch++; + bbr_log_startup_event(bbr, cts, rtt_gain, + delta, bbr->r_ctl.startup_last_srtt, 10); + return (0); + } + } + if ((bbr->r_ctl.r_measurement_count == bbr->r_ctl.last_startup_measure) && + (bbr->r_ctl.rc_lost_at_startup == bbr->r_ctl.rc_lost) && + (!IN_RECOVERY(bbr->rc_tp->t_flags))) { + /* + * We only assess if we have a new measurment when + * we have no loss and are not in recovery. + * Drag up by one our last_startup epoch so we will hold + * the number of non-gain we have already accumulated. + */ + if (bbr->r_ctl.rc_bbr_last_startup_epoch < bbr->r_ctl.rc_pkt_epoch) + bbr->r_ctl.rc_bbr_last_startup_epoch++; + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 9); + return (0); + } + /* Case where we reduced the lost (bad retransmit) */ + if (bbr->r_ctl.rc_lost_at_startup > bbr->r_ctl.rc_lost) + bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; + bbr->r_ctl.last_startup_measure = bbr->r_ctl.r_measurement_count; + btlbw = bbr_get_full_bw(bbr); + if (bbr->r_ctl.rc_bbr_hptsi_gain == bbr_startup_lower) + gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * + (uint64_t)bbr_low_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; + else + gain = ((bbr->r_ctl.rc_bbr_lastbtlbw * + (uint64_t)bbr_start_exit) / (uint64_t)100) + bbr->r_ctl.rc_bbr_lastbtlbw; + do_exit = 0; + if (btlbw > bbr->r_ctl.rc_bbr_lastbtlbw) + bbr->r_ctl.rc_bbr_lastbtlbw = btlbw; + if (btlbw >= gain) { + bbr->r_ctl.rc_bbr_last_startup_epoch = bbr->r_ctl.rc_pkt_epoch; + /* Update the lost so we won't exit in next set of tests */ + bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 3); + } + if ((bbr->rc_loss_exit && + (bbr->r_ctl.rc_lost > bbr->r_ctl.rc_lost_at_startup) && + (bbr->r_ctl.rc_pkt_epoch_loss_rate > bbr_startup_loss_thresh)) && + ((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS)) { + /* + * If we had no gain, we had loss and that loss was above + * our threshould, the rwnd is not constrained, and we have + * had at least 3 packet epochs exit. Note that this is + * switched off by sysctl. Google does not do this by the + * way. + */ + if ((ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) + + (2 * max(bbr->r_ctl.rc_pace_max_segs, bbr->rc_tp->t_maxseg))) <= bbr->rc_tp->snd_wnd) { + do_exit = 1; + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 4); + } else { + /* Just record an updated loss value */ + bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 5); + } + } else + bbr->r_ctl.rc_lost_at_startup = bbr->r_ctl.rc_lost; + if (((bbr->r_ctl.rc_pkt_epoch - bbr->r_ctl.rc_bbr_last_startup_epoch) >= BBR_STARTUP_EPOCHS) || + do_exit) { + /* Return 1 to exit the startup state. */ + return (1); + } + /* Stay in startup */ + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 8); + return (0); +} + +static void +bbr_state_change(struct tcp_bbr *bbr, uint32_t cts, int32_t epoch, int32_t pkt_epoch, uint32_t losses) +{ + /* + * A tick occured in the rtt epoch do we need to do anything? + */ +#ifdef BBR_INVARIANTS + if ((bbr->rc_bbr_state != BBR_STATE_STARTUP) && + (bbr->rc_bbr_state != BBR_STATE_DRAIN) && + (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) && + (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) && + (bbr->rc_bbr_state != BBR_STATE_PROBE_BW)) { + /* Debug code? */ + panic("Unknown BBR state %d?\n", bbr->rc_bbr_state); + } +#endif + if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { + /* Do we exit the startup state? */ + if (bbr_state_startup(bbr, cts, epoch, pkt_epoch)) { + uint32_t time_in; + + bbr_log_startup_event(bbr, cts, bbr->r_ctl.rc_bbr_last_startup_epoch, + bbr->r_ctl.rc_lost_at_startup, bbr_start_exit, 6); + bbr->rc_filled_pipe = 1; + bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; + if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { + + time_in = cts - bbr->r_ctl.rc_bbr_state_time; + counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); + } else + time_in = 0; + if (bbr->rc_no_pacing) + bbr->rc_no_pacing = 0; + bbr->r_ctl.rc_bbr_state_time = cts; + bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.rc_drain_pg; + bbr->rc_bbr_state = BBR_STATE_DRAIN; + bbr_set_state_target(bbr, __LINE__); + if ((bbr->rc_use_google == 0) && + bbr_slam_cwnd_in_main_drain) { + /* Here we don't have to worry about probe-rtt */ + bbr->r_ctl.rc_saved_cwnd = bbr->rc_tp->snd_cwnd; + bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + bbr->r_ctl.rc_bbr_cwnd_gain = bbr_high_gain; + bbr_log_type_statechange(bbr, cts, __LINE__); + if (ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)) <= + bbr->r_ctl.rc_target_at_state) { + /* + * Switch to probe_bw if we are already + * there + */ + bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); + bbr_substate_change(bbr, cts, __LINE__, 0); + bbr->rc_bbr_state = BBR_STATE_PROBE_BW; + bbr_log_type_statechange(bbr, cts, __LINE__); + } + } + } else if (bbr->rc_bbr_state == BBR_STATE_IDLE_EXIT) { + uint32_t inflight; + struct tcpcb *tp; + + tp = bbr->rc_tp; + inflight = ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + if (inflight >= bbr->r_ctl.rc_target_at_state) { + /* We have reached a flight of the cwnd target */ + bbr->rc_bbr_state = BBR_STATE_PROBE_BW; + bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; + bbr->r_ctl.rc_bbr_cwnd_gain = BBR_UNIT; + bbr_set_state_target(bbr, __LINE__); + /* + * Rig it so we don't do anything crazy and + * start fresh with a new randomization. + */ + bbr->r_ctl.bbr_smallest_srtt_this_state = 0xffffffff; + bbr->rc_bbr_substate = BBR_SUB_LEVEL6; + bbr_substate_change(bbr, cts, __LINE__, 1); + } + } else if (bbr->rc_bbr_state == BBR_STATE_DRAIN) { + /* Has in-flight reached the bdp (or less)? */ + uint32_t inflight; + struct tcpcb *tp; + + tp = bbr->rc_tp; + inflight = ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + if ((bbr->rc_use_google == 0) && + bbr_slam_cwnd_in_main_drain && + (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { + /* + * Here we don't have to worry about probe-rtt + * re-slam it, but keep it slammed down. + */ + bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + if (inflight <= bbr->r_ctl.rc_target_at_state) { + /* We have drained */ + bbr->rc_bbr_state = BBR_STATE_PROBE_BW; + bbr->r_ctl.bbr_lost_at_state = bbr->r_ctl.rc_lost; + if (SEQ_GT(cts, bbr->r_ctl.rc_bbr_state_time)) { + uint32_t time_in; + + time_in = cts - bbr->r_ctl.rc_bbr_state_time; + counter_u64_add(bbr_state_time[bbr->rc_bbr_state], time_in); + } + if ((bbr->rc_use_google == 0) && + bbr_slam_cwnd_in_main_drain && + (tp->snd_cwnd < bbr->r_ctl.rc_saved_cwnd)) { + /* Restore the cwnd */ + tp->snd_cwnd = bbr->r_ctl.rc_saved_cwnd; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + /* Setup probe-rtt has being done now RRS-HERE */ + bbr->r_ctl.rc_rtt_shrinks = cts; + bbr->r_ctl.last_in_probertt = cts; + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_LEAVE_DRAIN, 0); + /* Randomly pick a sub-state */ + bbr->rc_bbr_substate = bbr_pick_probebw_substate(bbr, cts); + bbr_substate_change(bbr, cts, __LINE__, 0); + bbr_log_type_statechange(bbr, cts, __LINE__); + } + } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) { + uint32_t flight; + + flight = ctf_flight_size(bbr->rc_tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + bbr->r_ctl.r_app_limited_until = (flight + bbr->r_ctl.rc_delivered); + if (((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google) && + (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { + /* + * We must keep cwnd at the desired MSS. + */ + bbr->rc_tp->snd_cwnd = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options); + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } else if ((bbr_prtt_slam_cwnd) && + (bbr->rc_tp->snd_cwnd > bbr->r_ctl.rc_target_at_state)) { + /* Re-slam it */ + bbr->rc_tp->snd_cwnd = bbr->r_ctl.rc_target_at_state; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 12, 0, 0, __LINE__); + } + if (bbr->r_ctl.rc_bbr_enters_probertt == 0) { + /* Has outstanding reached our target? */ + if (flight <= bbr->r_ctl.rc_target_at_state) { + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_REACHTAR, 0); + bbr->r_ctl.rc_bbr_enters_probertt = cts; + /* If time is exactly 0, be 1usec off */ + if (bbr->r_ctl.rc_bbr_enters_probertt == 0) + bbr->r_ctl.rc_bbr_enters_probertt = 1; + if (bbr->rc_use_google == 0) { + /* + * Restore any lowering that as occured to + * reach here + */ + if (bbr->r_ctl.bbr_rttprobe_gain_val) + bbr->r_ctl.rc_bbr_hptsi_gain = bbr->r_ctl.bbr_rttprobe_gain_val; + else + bbr->r_ctl.rc_bbr_hptsi_gain = BBR_UNIT; + } + } + if ((bbr->r_ctl.rc_bbr_enters_probertt == 0) && + (bbr->rc_use_google == 0) && + bbr->r_ctl.bbr_rttprobe_gain_val && + (((cts - bbr->r_ctl.rc_probertt_srttchktim) > bbr_get_rtt(bbr, bbr_drain_rtt)) || + (flight >= bbr->r_ctl.flightsize_at_drain))) { + /* + * We have doddled with our current hptsi + * gain an srtt and have still not made it + * to target, or we have increased our flight. + * Lets reduce the gain by xx% + * flooring the reduce at DRAIN (based on + * mul/div) + */ + int red; + + bbr->r_ctl.flightsize_at_drain = flight; + bbr->r_ctl.rc_probertt_srttchktim = cts; + red = max((bbr->r_ctl.bbr_rttprobe_gain_val / 10), 1); + if ((bbr->r_ctl.rc_bbr_hptsi_gain - red) > max(bbr_drain_floor, 1)) { + /* Reduce our gain again */ + bbr->r_ctl.rc_bbr_hptsi_gain -= red; + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG, 0); + } else if (bbr->r_ctl.rc_bbr_hptsi_gain > max(bbr_drain_floor, 1)) { + /* one more chance before we give up */ + bbr->r_ctl.rc_bbr_hptsi_gain = max(bbr_drain_floor, 1); + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_SHRINK_PG_FINAL, 0); + } else { + /* At the very bottom */ + bbr->r_ctl.rc_bbr_hptsi_gain = max((bbr_drain_floor-1), 1); + } + } + } + if (bbr->r_ctl.rc_bbr_enters_probertt && + (TSTMP_GT(cts, bbr->r_ctl.rc_bbr_enters_probertt)) && + ((cts - bbr->r_ctl.rc_bbr_enters_probertt) >= bbr_rtt_probe_time)) { + /* Time to exit probe RTT normally */ + bbr_exit_probe_rtt(bbr->rc_tp, bbr, cts); + } + } else if (bbr->rc_bbr_state == BBR_STATE_PROBE_BW) { + if ((bbr->rc_tp->snd_una == bbr->rc_tp->snd_max) && + (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { + /* + * This qualifies as a RTT_PROBE session since we + * drop the data outstanding to nothing and waited + * more than bbr_rtt_probe_time. + */ + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); + bbr_set_reduced_rtt(bbr, cts, __LINE__); + } + if (bbr_should_enter_probe_rtt(bbr, cts)) { + bbr_enter_probe_rtt(bbr, cts, __LINE__); + } else { + bbr_set_probebw_gains(bbr, cts, losses); + } + } +} + +static void +bbr_check_bbr_for_state(struct tcp_bbr *bbr, uint32_t cts, int32_t line, uint32_t losses) +{ + int32_t epoch = 0; + + if ((cts - bbr->r_ctl.rc_rcv_epoch_start) >= bbr_get_rtt(bbr, BBR_RTT_PROP)) { + bbr_set_epoch(bbr, cts, line); + /* At each epoch doe lt bw sampling */ + epoch = 1; + } + bbr_state_change(bbr, cts, epoch, bbr->rc_is_pkt_epoch_now, losses); +} + +static int +bbr_do_segment_nounlock(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos, + int32_t nxt_pkt, struct timeval *tv) +{ + int32_t thflags, retval; + uint32_t cts, lcts; + uint32_t tiwin; + struct tcpopt to; + struct tcp_bbr *bbr; + struct bbr_sendmap *rsm; + struct timeval ltv; + int32_t did_out = 0; + int32_t in_recovery; + uint16_t nsegs; + int32_t prev_state; + uint32_t lost; + + nsegs = max(1, m->m_pkthdr.lro_nsegs); + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + /* add in our stats */ + kern_prefetch(bbr, &prev_state); + prev_state = 0; + thflags = th->th_flags; + /* + * If this is either a state-changing packet or current state isn't + * established, we require a write lock on tcbinfo. Otherwise, we + * allow the tcbinfo to be in either alocked or unlocked, as the + * caller may have unnecessarily acquired a write lock due to a + * race. + */ + INP_WLOCK_ASSERT(tp->t_inpcb); + KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN", + __func__)); + KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT", + __func__)); + + tp->t_rcvtime = ticks; + /* + * Unscale the window into a 32-bit value. For the SYN_SENT state + * the scale is zero. + */ + tiwin = th->th_win << tp->snd_scale; +#ifdef NETFLIX_STATS + stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin); +#endif + /* + * Parse options on any incoming segment. + */ + tcp_dooptions(&to, (u_char *)(th + 1), + (th->th_off << 2) - sizeof(struct tcphdr), + (thflags & TH_SYN) ? TO_SYN : 0); + + if (m->m_flags & M_TSTMP) { + /* Prefer the hardware timestamp if present */ + struct timespec ts; + + mbuf_tstmp2timespec(m, &ts); + bbr->rc_tv.tv_sec = ts.tv_sec; + bbr->rc_tv.tv_usec = ts.tv_nsec / 1000; + bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv); + } else if (m->m_flags & M_TSTMP_LRO) { + /* Next the arrival timestamp */ + struct timespec ts; + + mbuf_tstmp2timespec(m, &ts); + bbr->rc_tv.tv_sec = ts.tv_sec; + bbr->rc_tv.tv_usec = ts.tv_nsec / 1000; + bbr->r_ctl.rc_rcvtime = cts = tcp_tv_to_usectick(&bbr->rc_tv); + } else { + /* + * Ok just get the current time. + */ + bbr->r_ctl.rc_rcvtime = lcts = cts = tcp_get_usecs(&bbr->rc_tv); + } + /* + * If echoed timestamp is later than the current time, fall back to + * non RFC1323 RTT calculation. Normalize timestamp if syncookies + * were used when this connection was established. + */ + if ((to.to_flags & TOF_TS) && (to.to_tsecr != 0)) { + to.to_tsecr -= tp->ts_offset; + if (TSTMP_GT(to.to_tsecr, tcp_tv_to_mssectick(&bbr->rc_tv))) + to.to_tsecr = 0; + } + /* + * If its the first time in we need to take care of options and + * verify we can do SACK for rack! + */ + if (bbr->r_state == 0) { + /* + * Process options only when we get SYN/ACK back. The SYN + * case for incoming connections is handled in tcp_syncache. + * According to RFC1323 the window field in a SYN (i.e., a + * <SYN> or <SYN,ACK>) segment itself is never scaled. XXX + * this is traditional behavior, may need to be cleaned up. + */ + if (bbr->rc_inp == NULL) { + bbr->rc_inp = tp->t_inpcb; + } + /* + * We need to init rc_inp here since its not init'd when + * bbr_init is called + */ + if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) { + if ((to.to_flags & TOF_SCALE) && + (tp->t_flags & TF_REQ_SCALE)) { + tp->t_flags |= TF_RCVD_SCALE; + tp->snd_scale = to.to_wscale; + } + /* + * Initial send window. It will be updated with the + * next incoming segment to the scaled value. + */ + tp->snd_wnd = th->th_win; + if (to.to_flags & TOF_TS) { + tp->t_flags |= TF_RCVD_TSTMP; + tp->ts_recent = to.to_tsval; + tp->ts_recent_age = tcp_tv_to_mssectick(&bbr->rc_tv); + } + if (to.to_flags & TOF_MSS) + tcp_mss(tp, to.to_mss); + if ((tp->t_flags & TF_SACK_PERMIT) && + (to.to_flags & TOF_SACKPERM) == 0) + tp->t_flags &= ~TF_SACK_PERMIT; + if (IS_FASTOPEN(tp->t_flags)) { + if (to.to_flags & TOF_FASTOPEN) { + uint16_t mss; + + if (to.to_flags & TOF_MSS) + mss = to.to_mss; + else + if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) + mss = TCP6_MSS; + else + mss = TCP_MSS; + tcp_fastopen_update_cache(tp, mss, + to.to_tfo_len, to.to_tfo_cookie); + } else + tcp_fastopen_disable_path(tp); + } + } + /* + * At this point we are at the initial call. Here we decide + * if we are doing RACK or not. We do this by seeing if + * TF_SACK_PERMIT is set, if not rack is *not* possible and + * we switch to the default code. + */ + if ((tp->t_flags & TF_SACK_PERMIT) == 0) { + /* Bail */ + tcp_switch_back_to_default(tp); + (*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen, + tlen, iptos); + return (1); + } + /* Set the flag */ + bbr->r_is_v6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0; + tcp_set_hpts(tp->t_inpcb); + sack_filter_clear(&bbr->r_ctl.bbr_sf, th->th_ack); + } + if (thflags & TH_ACK) { + /* Track ack types */ + if (to.to_flags & TOF_SACK) + BBR_STAT_INC(bbr_acks_with_sacks); + else + BBR_STAT_INC(bbr_plain_acks); + } + /* + * This is the one exception case where we set the rack state + * always. All other times (timers etc) we must have a rack-state + * set (so we assure we have done the checks above for SACK). + */ + if (bbr->r_state != tp->t_state) + bbr_set_state(tp, bbr, tiwin); + + if (SEQ_GT(th->th_ack, tp->snd_una) && (rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map)) != NULL) + kern_prefetch(rsm, &prev_state); + prev_state = bbr->r_state; + bbr->rc_ack_was_delayed = 0; + lost = bbr->r_ctl.rc_lost; + bbr->rc_is_pkt_epoch_now = 0; + if (m->m_flags & (M_TSTMP|M_TSTMP_LRO)) { + /* Get the real time into lcts and figure the real delay */ + lcts = tcp_get_usecs(<v); + if (TSTMP_GT(lcts, cts)) { + bbr->r_ctl.rc_ack_hdwr_delay = lcts - cts; + bbr->rc_ack_was_delayed = 1; + if (TSTMP_GT(bbr->r_ctl.rc_ack_hdwr_delay, + bbr->r_ctl.highest_hdwr_delay)) + bbr->r_ctl.highest_hdwr_delay = bbr->r_ctl.rc_ack_hdwr_delay; + } else { + bbr->r_ctl.rc_ack_hdwr_delay = 0; + bbr->rc_ack_was_delayed = 0; + } + } else { + bbr->r_ctl.rc_ack_hdwr_delay = 0; + bbr->rc_ack_was_delayed = 0; + } + bbr_log_ack_event(bbr, th, &to, tlen, nsegs, cts, nxt_pkt, m); + if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) { + retval = 0; + m_freem(m); + goto done_with_input; + } + /* + * If a segment with the ACK-bit set arrives in the SYN-SENT state + * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9. + */ + if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) && + (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) { + ctf_do_dropwithreset_conn(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return (1); + } + in_recovery = IN_RECOVERY(tp->t_flags); + if (tiwin > bbr->r_ctl.rc_high_rwnd) + bbr->r_ctl.rc_high_rwnd = tiwin; +#ifdef BBR_INVARIANTS + if ((tp->t_inpcb->inp_flags & INP_DROPPED) || + (tp->t_inpcb->inp_flags2 & INP_FREED)) { + panic("tp:%p bbr:%p given a dropped inp:%p", + tp, bbr, tp->t_inpcb); + } +#endif + bbr->r_ctl.rc_flight_at_input = ctf_flight_size(tp, + (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + bbr->rtt_valid = 0; + if (to.to_flags & TOF_TS) { + bbr->rc_ts_valid = 1; + bbr->r_ctl.last_inbound_ts = to.to_tsval; + } else { + bbr->rc_ts_valid = 0; + bbr->r_ctl.last_inbound_ts = 0; + } + retval = (*bbr->r_substate) (m, th, so, + tp, &to, drop_hdrlen, + tlen, tiwin, thflags, nxt_pkt); +#ifdef BBR_INVARIANTS + if ((retval == 0) && + (tp->t_inpcb == NULL)) { + panic("retval:%d tp:%p t_inpcb:NULL state:%d", + retval, tp, prev_state); + } +#endif + if (nxt_pkt == 0) + BBR_STAT_INC(bbr_rlock_left_ret0); + else + BBR_STAT_INC(bbr_rlock_left_ret1); + if (retval == 0) { + /* + * If retval is 1 the tcb is unlocked and most likely the tp + * is gone. + */ + INP_WLOCK_ASSERT(tp->t_inpcb); + tcp_bbr_xmit_timer_commit(bbr, tp, cts); + if (bbr->rc_is_pkt_epoch_now) + bbr_set_pktepoch(bbr, cts, __LINE__); + bbr_check_bbr_for_state(bbr, cts, __LINE__, (bbr->r_ctl.rc_lost - lost)); + if (nxt_pkt == 0) { + if (bbr->r_wanted_output != 0) { + bbr->rc_output_starts_timer = 0; + did_out = 1; + (void)tp->t_fb->tfb_tcp_output(tp); + } else + bbr_start_hpts_timer(bbr, tp, cts, 6, 0, 0); + } + if ((nxt_pkt == 0) && + ((bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) && + (SEQ_GT(tp->snd_max, tp->snd_una) || + (tp->t_flags & TF_DELACK) || + ((tcp_always_keepalive || bbr->rc_inp->inp_socket->so_options & SO_KEEPALIVE) && + (tp->t_state <= TCPS_CLOSING)))) { + /* + * We could not send (probably in the hpts but + * stopped the timer)? + */ + if ((tp->snd_max == tp->snd_una) && + ((tp->t_flags & TF_DELACK) == 0) && + (bbr->rc_inp->inp_in_hpts) && + (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { + /* + * keep alive not needed if we are hptsi + * output yet + */ + ; + } else { + if (bbr->rc_inp->inp_in_hpts) { + tcp_hpts_remove(bbr->rc_inp, HPTS_REMOVE_OUTPUT); + if ((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) && + (TSTMP_GT(lcts, bbr->rc_pacer_started))) { + uint32_t del; + + del = lcts - bbr->rc_pacer_started; + if (del > bbr->r_ctl.rc_last_delay_val) { + BBR_STAT_INC(bbr_force_timer_start); + bbr->r_ctl.rc_last_delay_val -= del; + bbr->rc_pacer_started = lcts; + } else { + /* We are late */ + BBR_STAT_INC(bbr_force_output); + (void)tp->t_fb->tfb_tcp_output(tp); + } + } + } + bbr_start_hpts_timer(bbr, tp, cts, 8, bbr->r_ctl.rc_last_delay_val, + 0); + } + } else if ((bbr->rc_output_starts_timer == 0) && (nxt_pkt == 0)) { + /* Do we have the correct timer running? */ + bbr_timer_audit(tp, bbr, lcts, &so->so_snd); + } + /* Do we have a new state */ + if (bbr->r_state != tp->t_state) + bbr_set_state(tp, bbr, tiwin); +done_with_input: + bbr_log_doseg_done(bbr, cts, nxt_pkt, did_out); + if (did_out) + bbr->r_wanted_output = 0; +#ifdef BBR_INVARIANTS + if (tp->t_inpcb == NULL) { + panic("OP:%d retval:%d tp:%p t_inpcb:NULL state:%d", + did_out, + retval, tp, prev_state); + } +#endif + } + return (retval); +} + +static void +bbr_log_type_hrdwtso(struct tcpcb *tp, struct tcp_bbr *bbr, int len, int mod, int what_we_can_send) +{ + if (tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + struct timeval tv; + uint32_t cts; + + cts = tcp_get_usecs(&tv); + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + log.u_bbr.flex1 = bbr->r_ctl.rc_pace_min_segs; + log.u_bbr.flex2 = what_we_can_send; + log.u_bbr.flex3 = bbr->r_ctl.rc_pace_max_segs; + log.u_bbr.flex4 = len; + log.u_bbr.flex5 = 0; + log.u_bbr.flex7 = mod; + log.u_bbr.flex8 = 1; + TCP_LOG_EVENTP(tp, NULL, + &tp->t_inpcb->inp_socket->so_rcv, + &tp->t_inpcb->inp_socket->so_snd, + TCP_HDWR_TLS, 0, + 0, &log, false, &tv); + } +} + +static void +bbr_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, + struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos) +{ + struct timeval tv; + int retval; + + /* First lets see if we have old packets */ + if (tp->t_in_pkt) { + if (ctf_do_queued_segments(so, tp, 1)) { + m_freem(m); + return; + } + } + if (m->m_flags & M_TSTMP_LRO) { + tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000; + tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000; + } else { + /* Should not be should we kassert instead? */ + tcp_get_usecs(&tv); + } + retval = bbr_do_segment_nounlock(m, th, so, tp, + drop_hdrlen, tlen, iptos, 0, &tv); + if (retval == 0) + INP_WUNLOCK(tp->t_inpcb); +} + +/* + * Return how much data can be sent without violating the + * cwnd or rwnd. + */ + +static inline uint32_t +bbr_what_can_we_send(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t sendwin, + uint32_t avail, int32_t sb_offset, uint32_t cts) +{ + uint32_t len; + + if (ctf_outstanding(tp) >= tp->snd_wnd) { + /* We never want to go over our peers rcv-window */ + len = 0; + } else { + uint32_t flight; + + flight = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + bbr->r_ctl.rc_lost_bytes)); + if (flight >= sendwin) { + /* + * We have in flight what we are allowed by cwnd (if + * it was rwnd blocking it would have hit above out + * >= tp->snd_wnd). + */ + return (0); + } + len = sendwin - flight; + if ((len + ctf_outstanding(tp)) > tp->snd_wnd) { + /* We would send too much (beyond the rwnd) */ + len = tp->snd_wnd - ctf_outstanding(tp); + } + if ((len + sb_offset) > avail) { + /* + * We don't have that much in the SB, how much is + * there? + */ + len = avail - sb_offset; + } + } + return (len); +} + +static inline void +bbr_do_error_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error) +{ +#ifdef NETFLIX_STATS + TCPSTAT_INC(tcps_sndpack_error); + TCPSTAT_ADD(tcps_sndbyte_error, len); +#endif +} + +static inline void +bbr_do_send_accounting(struct tcpcb *tp, struct tcp_bbr *bbr, struct bbr_sendmap *rsm, int32_t len, int32_t error) +{ + if (error) { + bbr_do_error_accounting(tp, bbr, rsm, len, error); + return; + } + if ((tp->t_flags & TF_FORCEDATA) && len == 1) { + /* Window probe */ + TCPSTAT_INC(tcps_sndprobe); +#ifdef NETFLIX_STATS + stats_voi_update_abs_u32(tp->t_stats, + VOI_TCP_RETXPB, len); +#endif + } else if (rsm) { + if (rsm->r_flags & BBR_TLP) { + /* + * TLP should not count in retran count, but in its + * own bin + */ +#ifdef NETFLIX_STATS + tp->t_sndtlppack++; + tp->t_sndtlpbyte += len; + TCPSTAT_INC(tcps_tlpresends); + TCPSTAT_ADD(tcps_tlpresend_bytes, len); +#endif + } else { + /* Retransmit */ + tp->t_sndrexmitpack++; + TCPSTAT_INC(tcps_sndrexmitpack); + TCPSTAT_ADD(tcps_sndrexmitbyte, len); +#ifdef NETFLIX_STATS + stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_RETXPB, + len); +#endif + } + /* + * Logs in 0 - 8, 8 is all non probe_bw states 0-7 is + * sub-state + */ + counter_u64_add(bbr_state_lost[rsm->r_bbr_state], len); + if (bbr->rc_bbr_state != BBR_STATE_PROBE_BW) { + /* Non probe_bw log in 1, 2, or 4. */ + counter_u64_add(bbr_state_resend[bbr->rc_bbr_state], len); + } else { + /* + * Log our probe state 3, and log also 5-13 to show + * us the recovery sub-state for the send. This + * means that 3 == (5+6+7+8+9+10+11+12+13) + */ + counter_u64_add(bbr_state_resend[BBR_STATE_PROBE_BW], len); + counter_u64_add(bbr_state_resend[(bbr_state_val(bbr) + 5)], len); + } + /* Place in both 16's the totals of retransmitted */ + counter_u64_add(bbr_state_lost[16], len); + counter_u64_add(bbr_state_resend[16], len); + /* Place in 17's the total sent */ + counter_u64_add(bbr_state_resend[17], len); + counter_u64_add(bbr_state_lost[17], len); + + } else { + /* New sends */ + TCPSTAT_INC(tcps_sndpack); + TCPSTAT_ADD(tcps_sndbyte, len); + /* Place in 17's the total sent */ + counter_u64_add(bbr_state_resend[17], len); + counter_u64_add(bbr_state_lost[17], len); +#ifdef NETFLIX_STATS + stats_voi_update_abs_u64(tp->t_stats, VOI_TCP_TXPB, + len); +#endif + } +} + +static void +bbr_cwnd_limiting(struct tcpcb *tp, struct tcp_bbr *bbr, uint32_t in_level) +{ + if (bbr->rc_filled_pipe && bbr_target_cwnd_mult_limit && (bbr->rc_use_google == 0)) { + /* + * Limit the cwnd to not be above N x the target plus whats + * is outstanding. The target is based on the current b/w + * estimate. + */ + uint32_t target; + + target = bbr_get_target_cwnd(bbr, bbr_get_bw(bbr), BBR_UNIT); + target += ctf_outstanding(tp); + target *= bbr_target_cwnd_mult_limit; + if (tp->snd_cwnd > target) + tp->snd_cwnd = target; + bbr_log_type_cwndupd(bbr, 0, 0, 0, 10, 0, 0, __LINE__); + } +} + +static int +bbr_window_update_needed(struct tcpcb *tp, struct socket *so, uint32_t recwin, int32_t maxseg) +{ + /* + * "adv" is the amount we could increase the window, taking into + * account that we are limited by TCP_MAXWIN << tp->rcv_scale. + */ + uint32_t adv; + int32_t oldwin; + + adv = min(recwin, TCP_MAXWIN << tp->rcv_scale); + if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) { + oldwin = (tp->rcv_adv - tp->rcv_nxt); + adv -= oldwin; + } else + oldwin = 0; + + /* + * If the new window size ends up being the same as the old size + * when it is scaled, then don't force a window update. + */ + if (oldwin >> tp->rcv_scale == (adv + oldwin) >> tp->rcv_scale) + return (0); + + if (adv >= (2 * maxseg) && + (adv >= (so->so_rcv.sb_hiwat / 4) || + recwin <= (so->so_rcv.sb_hiwat / 8) || + so->so_rcv.sb_hiwat <= 8 * maxseg)) { + return (1); + } + if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat) + return (1); + return (0); +} + +/* + * Return 0 on success and a errno on failure to send. + * Note that a 0 return may not mean we sent anything + * if the TCB was on the hpts. A non-zero return + * does indicate the error we got from ip[6]_output. + */ +static int +bbr_output_wtime(struct tcpcb *tp, const struct timeval *tv) +{ + struct socket *so; + int32_t len; + uint32_t cts; + uint32_t recwin, sendwin; + int32_t sb_offset; + int32_t flags, abandon, error = 0; + struct tcp_log_buffer *lgb = NULL; + struct mbuf *m; + struct mbuf *mb; + uint32_t if_hw_tsomaxsegcount = 0; + uint32_t if_hw_tsomaxsegsize = 0; + uint32_t if_hw_tsomax = 0; + struct ip *ip = NULL; +#ifdef TCPDEBUG + struct ipovly *ipov = NULL; +#endif + struct tcp_bbr *bbr; + struct tcphdr *th; +#ifdef NETFLIX_TCPOUDP + struct udphdr *udp = NULL; +#endif + u_char opt[TCP_MAXOLEN]; + unsigned ipoptlen, optlen, hdrlen; +#ifdef NETFLIX_TCPOUDP + unsigned ulen; +#endif + uint32_t bbr_seq; + uint32_t delay_calc=0; + uint8_t doing_tlp = 0; + uint8_t local_options; +#ifdef BBR_INVARIANTS + uint8_t doing_retran_from = 0; + uint8_t picked_up_retran = 0; +#endif + uint8_t wanted_cookie = 0; + uint8_t more_to_rxt=0; + int32_t prefetch_so_done = 0; + int32_t prefetch_rsm = 0; + uint32_t what_we_can = 0; + uint32_t tot_len = 0; + uint32_t rtr_cnt = 0; + uint32_t maxseg, pace_max_segs, p_maxseg; + int32_t csum_flags; + int32_t hw_tls; +#if defined(IPSEC) || defined(IPSEC_SUPPORT) + unsigned ipsec_optlen = 0; + +#endif + volatile int32_t sack_rxmit; + struct bbr_sendmap *rsm = NULL; + int32_t tso, mtu; + int force_tso = 0; + struct tcpopt to; + int32_t slot = 0; + struct inpcb *inp; + struct sockbuf *sb; + uint32_t hpts_calling; +#ifdef INET6 + struct ip6_hdr *ip6 = NULL; + int32_t isipv6; +#endif + uint8_t app_limited = BBR_JR_SENT_DATA; + uint8_t filled_all = 0; + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + /* We take a cache hit here */ + memcpy(&bbr->rc_tv, tv, sizeof(struct timeval)); + cts = tcp_tv_to_usectick(&bbr->rc_tv); + inp = bbr->rc_inp; + so = inp->inp_socket; + sb = &so->so_snd; +#ifdef KERN_TLS + if (sb->sb_flags & SB_TLS_IFNET) + hw_tls = 1; + else +#endif + hw_tls = 0; + kern_prefetch(sb, &maxseg); + maxseg = tp->t_maxseg - bbr->rc_last_options; + if (bbr_minseg(bbr) < maxseg) { + tcp_bbr_tso_size_check(bbr, cts); + } + /* Remove any flags that indicate we are pacing on the inp */ + pace_max_segs = bbr->r_ctl.rc_pace_max_segs; + p_maxseg = min(maxseg, pace_max_segs); + INP_WLOCK_ASSERT(inp); +#ifdef TCP_OFFLOAD + if (tp->t_flags & TF_TOE) + return (tcp_offload_output(tp)); +#endif + +#ifdef INET6 + if (bbr->r_state) { + /* Use the cache line loaded if possible */ + isipv6 = bbr->r_is_v6; + } else { + isipv6 = (inp->inp_vflag & INP_IPV6) != 0; + } +#endif + if (((bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) == 0) && + inp->inp_in_hpts) { + /* + * We are on the hpts for some timer but not hptsi output. + * Possibly remove from the hpts so we can send/recv etc. + */ + if ((tp->t_flags & TF_ACKNOW) == 0) { + /* + * No immediate demand right now to send an ack, but + * the user may have read, making room for new data + * (a window update). If so we may want to cancel + * whatever timer is running (KEEP/DEL-ACK?) and + * continue to send out a window update. Or we may + * have gotten more data into the socket buffer to + * send. + */ + recwin = min(max(sbspace(&so->so_rcv), 0), + TCP_MAXWIN << tp->rcv_scale); + if ((bbr_window_update_needed(tp, so, recwin, maxseg) == 0) && + ((sbavail(sb) + ((tcp_outflags[tp->t_state] & TH_FIN) ? 1 : 0)) <= + (tp->snd_max - tp->snd_una))) { + /* + * Nothing new to send and no window update + * is needed to send. Lets just return and + * let the timer-run off. + */ + return (0); + } + } + tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); + bbr_timer_cancel(bbr, __LINE__, cts); + } + if (bbr->r_ctl.rc_last_delay_val) { + /* Calculate a rough delay for early escape to sending */ + if (SEQ_GT(cts, bbr->rc_pacer_started)) + delay_calc = cts - bbr->rc_pacer_started; + if (delay_calc >= bbr->r_ctl.rc_last_delay_val) + delay_calc -= bbr->r_ctl.rc_last_delay_val; + else + delay_calc = 0; + } + /* Mark that we have called bbr_output(). */ + if ((bbr->r_timer_override) || + (tp->t_flags & TF_FORCEDATA) || + (tp->t_state < TCPS_ESTABLISHED)) { + /* Timeouts or early states are exempt */ + if (inp->inp_in_hpts) + tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); + } else if (inp->inp_in_hpts) { + if ((bbr->r_ctl.rc_last_delay_val) && + (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) && + delay_calc) { + /* + * We were being paced for output and the delay has + * already exceeded when we were supposed to be + * called, lets go ahead and pull out of the hpts + * and call output. + */ + counter_u64_add(bbr_out_size[TCP_MSS_ACCT_LATE], 1); + bbr->r_ctl.rc_last_delay_val = 0; + tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); + } else if (tp->t_state == TCPS_CLOSED) { + bbr->r_ctl.rc_last_delay_val = 0; + tcp_hpts_remove(inp, HPTS_REMOVE_OUTPUT); + } else { + /* + * On the hpts, you shall not pass! even if ACKNOW + * is on, we will when the hpts fires, unless of + * course we are overdue. + */ + counter_u64_add(bbr_out_size[TCP_MSS_ACCT_INPACE], 1); + return (0); + } + } + bbr->rc_cwnd_limited = 0; + if (bbr->r_ctl.rc_last_delay_val) { + /* recalculate the real delay and deal with over/under */ + if (SEQ_GT(cts, bbr->rc_pacer_started)) + delay_calc = cts - bbr->rc_pacer_started; + else + delay_calc = 0; + if (delay_calc >= bbr->r_ctl.rc_last_delay_val) + /* Setup the delay which will be added in */ + delay_calc -= bbr->r_ctl.rc_last_delay_val; + else { + /* + * We are early setup to adjust + * our slot time. + */ + bbr->r_ctl.rc_agg_early += (bbr->r_ctl.rc_last_delay_val - delay_calc); + bbr->r_ctl.rc_last_delay_val = 0; + bbr->r_agg_early_set = 1; + if (bbr->r_ctl.rc_hptsi_agg_delay) { + if (bbr->r_ctl.rc_hptsi_agg_delay >= bbr->r_ctl.rc_agg_early) { + /* Nope our previous late cancels out the early */ + bbr->r_ctl.rc_hptsi_agg_delay -= bbr->r_ctl.rc_agg_early; + bbr->r_agg_early_set = 0; + bbr->r_ctl.rc_agg_early = 0; + } else { + bbr->r_ctl.rc_agg_early -= bbr->r_ctl.rc_hptsi_agg_delay; + bbr->r_ctl.rc_hptsi_agg_delay = 0; + } + } + bbr_log_pacing_delay_calc(bbr, inp->inp_hpts_calls, + bbr->r_ctl.rc_agg_early, cts, 3, 0, + bbr->r_agg_early_set, 3); + BBR_STAT_INC(bbr_early); + delay_calc = 0; + } + } else { + /* We were not delayed due to hptsi */ + if (bbr->r_agg_early_set) + bbr->r_ctl.rc_agg_early = 0; + bbr->r_agg_early_set = 0; + delay_calc = 0; + } + if (delay_calc) { + /* + * We had a hptsi delay which means we are falling behind on + * sending at the expected rate. Calculate an extra amount + * of data we can send, if any, to put us back on track. + */ + if ((bbr->r_ctl.rc_hptsi_agg_delay + delay_calc) < bbr->r_ctl.rc_hptsi_agg_delay) + bbr->r_ctl.rc_hptsi_agg_delay = 0xffffffff; + else + bbr->r_ctl.rc_hptsi_agg_delay += delay_calc; + } + sendwin = min(tp->snd_wnd, tp->snd_cwnd); + if ((tp->snd_una == tp->snd_max) && + (bbr->rc_bbr_state != BBR_STATE_IDLE_EXIT) && + (sbavail(sb))) { + /* + * Ok we have been idle with nothing outstanding + * we possibly need to start fresh with either a new + * suite of states or a fast-ramp up. + */ + bbr_restart_after_idle(bbr, + cts, bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time)); + } + /* + * Now was there a hptsi delay where we are behind? We only count + * being behind if: a) We are not in recovery. b) There was a delay. + * <and> c) We had room to send something. + * + */ + hpts_calling = inp->inp_hpts_calls; + inp->inp_hpts_calls = 0; + if (bbr->r_ctl.rc_hpts_flags & PACE_TMR_MASK) { + if (bbr_process_timers(tp, bbr, cts, hpts_calling)) { + counter_u64_add(bbr_out_size[TCP_MSS_ACCT_ATIMER], 1); + return (0); + } + } + bbr->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY; + if (hpts_calling && + (bbr->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { + bbr->r_ctl.rc_last_delay_val = 0; + } + bbr->r_timer_override = 0; + bbr->r_wanted_output = 0; + /* + * For TFO connections in SYN_RECEIVED, only allow the initial + * SYN|ACK and those sent by the retransmit timer. + */ + if (IS_FASTOPEN(tp->t_flags) && + ((tp->t_state == TCPS_SYN_RECEIVED) || + (tp->t_state == TCPS_SYN_SENT)) && + SEQ_GT(tp->snd_max, tp->snd_una) && /* inital SYN or SYN|ACK sent */ + (tp->t_rxtshift == 0)) { /* not a retransmit */ + return (0); + } + /* + * Before sending anything check for a state update. For hpts + * calling without input this is important. If its input calling + * then this was already done. + */ + if (bbr->rc_use_google == 0) + bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); +again: + /* + * If we've recently taken a timeout, snd_max will be greater than + * snd_max. BBR in general does not pay much attention to snd_nxt + * for historic reasons the persist timer still uses it. This means + * we have to look at it. All retransmissions that are not persits + * use the rsm that needs to be sent so snd_nxt is ignored. At the + * end of this routine we pull snd_nxt always up to snd_max. + */ + doing_tlp = 0; +#ifdef BBR_INVARIANTS + doing_retran_from = picked_up_retran = 0; +#endif + error = 0; + tso = 0; + slot = 0; + mtu = 0; + sendwin = min(tp->snd_wnd, tp->snd_cwnd); + sb_offset = tp->snd_max - tp->snd_una; + flags = tcp_outflags[tp->t_state]; + sack_rxmit = 0; + len = 0; + rsm = NULL; + if (flags & TH_RST) { + SOCKBUF_LOCK(sb); + goto send; + } +recheck_resend: + while (bbr->r_ctl.rc_free_cnt < bbr_min_req_free) { + /* We need to always have one in reserve */ + rsm = bbr_alloc(bbr); + if (rsm == NULL) { + error = ENOMEM; + /* Lie to get on the hpts */ + tot_len = tp->t_maxseg; + if (hpts_calling) + /* Retry in a ms */ + slot = 1001; + goto just_return_nolock; + } + TAILQ_INSERT_TAIL(&bbr->r_ctl.rc_free, rsm, r_next); + bbr->r_ctl.rc_free_cnt++; + rsm = NULL; + } + /* What do we send, a resend? */ + if (bbr->r_ctl.rc_resend == NULL) { + /* Check for rack timeout */ + bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts); + if (bbr->r_ctl.rc_resend) { +#ifdef BBR_INVARIANTS + picked_up_retran = 1; +#endif + bbr_cong_signal(tp, NULL, CC_NDUPACK, bbr->r_ctl.rc_resend); + } + } + if (bbr->r_ctl.rc_resend) { + rsm = bbr->r_ctl.rc_resend; +#ifdef BBR_INVARIANTS + doing_retran_from = 1; +#endif + /* Remove any TLP flags its a RACK or T-O */ + rsm->r_flags &= ~BBR_TLP; + bbr->r_ctl.rc_resend = NULL; + if (SEQ_LT(rsm->r_start, tp->snd_una)) { +#ifdef BBR_INVARIANTS + panic("Huh, tp:%p bbr:%p rsm:%p start:%u < snd_una:%u\n", + tp, bbr, rsm, rsm->r_start, tp->snd_una); + goto recheck_resend; +#else + /* TSNH */ + rsm = NULL; + goto recheck_resend; +#endif + } + rtr_cnt++; + if (rsm->r_flags & BBR_HAS_SYN) { + /* Only retransmit a SYN by itself */ + len = 0; + if ((flags & TH_SYN) == 0) { + /* Huh something is wrong */ + rsm->r_start++; + if (rsm->r_start == rsm->r_end) { + /* Clean it up, somehow we missed the ack? */ + bbr_log_syn(tp, NULL); + } else { + /* TFO with data? */ + rsm->r_flags &= ~BBR_HAS_SYN; + len = rsm->r_end - rsm->r_start; + } + } else { + /* Retransmitting SYN */ + rsm = NULL; + SOCKBUF_LOCK(sb); + goto send; + } + } else + len = rsm->r_end - rsm->r_start; + if ((bbr->rc_resends_use_tso == 0) && +#ifdef KERN_TLS + ((sb->sb_flags & SB_TLS_IFNET) == 0) && +#endif + (len > maxseg)) { + len = maxseg; + more_to_rxt = 1; + } + sb_offset = rsm->r_start - tp->snd_una; + if (len > 0) { + sack_rxmit = 1; + TCPSTAT_INC(tcps_sack_rexmits); + TCPSTAT_ADD(tcps_sack_rexmit_bytes, + min(len, maxseg)); + } else { + /* I dont think this can happen */ + rsm = NULL; + goto recheck_resend; + } + BBR_STAT_INC(bbr_resends_set); + } else if (bbr->r_ctl.rc_tlp_send) { + /* + * Tail loss probe + */ + doing_tlp = 1; + rsm = bbr->r_ctl.rc_tlp_send; + bbr->r_ctl.rc_tlp_send = NULL; + sack_rxmit = 1; + len = rsm->r_end - rsm->r_start; + rtr_cnt++; + if ((bbr->rc_resends_use_tso == 0) && (len > maxseg)) + len = maxseg; + + if (SEQ_GT(tp->snd_una, rsm->r_start)) { +#ifdef BBR_INVARIANTS + panic("tp:%p bbc:%p snd_una:%u rsm:%p r_start:%u", + tp, bbr, tp->snd_una, rsm, rsm->r_start); +#else + /* TSNH */ + rsm = NULL; + goto recheck_resend; +#endif + } + sb_offset = rsm->r_start - tp->snd_una; + BBR_STAT_INC(bbr_tlp_set); + } + /* + * Enforce a connection sendmap count limit if set + * as long as we are not retransmiting. + */ + if ((rsm == NULL) && + (bbr_tcp_map_entries_limit > 0) && + (bbr->r_ctl.rc_num_maps_alloced >= bbr_tcp_map_entries_limit)) { + BBR_STAT_INC(bbr_alloc_limited); + if (!bbr->alloc_limit_reported) { + bbr->alloc_limit_reported = 1; + BBR_STAT_INC(bbr_alloc_limited_conns); + } + goto just_return_nolock; + } +#ifdef BBR_INVARIANTS + if (rsm && SEQ_LT(rsm->r_start, tp->snd_una)) { + panic("tp:%p bbr:%p rsm:%p sb_offset:%u len:%u", + tp, bbr, rsm, sb_offset, len); + } +#endif + /* + * Get standard flags, and add SYN or FIN if requested by 'hidden' + * state flags. + */ + if (tp->t_flags & TF_NEEDFIN && (rsm == NULL)) + flags |= TH_FIN; + if (tp->t_flags & TF_NEEDSYN) + flags |= TH_SYN; + + if (rsm && (rsm->r_flags & BBR_HAS_FIN)) { + /* we are retransmitting the fin */ + len--; + if (len) { + /* + * When retransmitting data do *not* include the + * FIN. This could happen from a TLP probe if we + * allowed data with a FIN. + */ + flags &= ~TH_FIN; + } + } else if (rsm) { + if (flags & TH_FIN) + flags &= ~TH_FIN; + } + if ((sack_rxmit == 0) && (prefetch_rsm == 0)) { + void *end_rsm; + + end_rsm = TAILQ_LAST_FAST(&bbr->r_ctl.rc_tmap, bbr_sendmap, r_tnext); + if (end_rsm) + kern_prefetch(end_rsm, &prefetch_rsm); + prefetch_rsm = 1; + } + SOCKBUF_LOCK(sb); + /* + * If in persist timeout with window of 0, send 1 byte. Otherwise, + * if window is small but nonzero and time TF_SENTFIN expired, we + * will send what we can and go to transmit state. + */ + if (tp->t_flags & TF_FORCEDATA) { + if ((sendwin == 0) || (sendwin <= (tp->snd_max - tp->snd_una))) { + /* + * If we still have some data to send, then clear + * the FIN bit. Usually this would happen below + * when it realizes that we aren't sending all the + * data. However, if we have exactly 1 byte of + * unsent data, then it won't clear the FIN bit + * below, and if we are in persist state, we wind up + * sending the packet without recording that we sent + * the FIN bit. + * + * We can't just blindly clear the FIN bit, because + * if we don't have any more data to send then the + * probe will be the FIN itself. + */ + if (sb_offset < sbused(sb)) + flags &= ~TH_FIN; + sendwin = 1; + } else { + if ((bbr->rc_in_persist != 0) && + (tp->snd_wnd >= min((bbr->r_ctl.rc_high_rwnd/2), + bbr_minseg(bbr)))) { + /* Exit persists if there is space */ + bbr_exit_persist(tp, bbr, cts, __LINE__); + } + if (rsm == NULL) { + /* + * If we are dropping persist mode then we + * need to correct sb_offset if not a + * retransmit. + */ + sb_offset = tp->snd_max - tp->snd_una; + } + } + } + /* + * If snd_nxt == snd_max and we have transmitted a FIN, the + * sb_offset will be > 0 even if so_snd.sb_cc is 0, resulting in a + * negative length. This can also occur when TCP opens up its + * congestion window while receiving additional duplicate acks after + * fast-retransmit because TCP will reset snd_nxt to snd_max after + * the fast-retransmit. + * + * In the normal retransmit-FIN-only case, however, snd_nxt will be + * set to snd_una, the sb_offset will be 0, and the length may wind + * up 0. + * + * If sack_rxmit is true we are retransmitting from the scoreboard + * in which case len is already set. + */ + if (sack_rxmit == 0) { + uint32_t avail; + + avail = sbavail(sb); + if (SEQ_GT(tp->snd_max, tp->snd_una)) + sb_offset = tp->snd_max - tp->snd_una; + else + sb_offset = 0; + if (bbr->rc_tlp_new_data) { + /* TLP is forcing out new data */ + uint32_t tlplen; + + doing_tlp = 1; + tlplen = maxseg; + + if (tlplen > (uint32_t)(avail - sb_offset)) { + tlplen = (uint32_t)(avail - sb_offset); + } + if (tlplen > tp->snd_wnd) { + len = tp->snd_wnd; + } else { + len = tlplen; + } + bbr->rc_tlp_new_data = 0; + } else { + what_we_can = len = bbr_what_can_we_send(tp, bbr, sendwin, avail, sb_offset, cts); + if ((len < p_maxseg) && + (bbr->rc_in_persist == 0) && + (ctf_outstanding(tp) >= (2 * p_maxseg)) && + ((avail - sb_offset) >= p_maxseg)) { + /* + * We are not completing whats in the socket + * buffer (i.e. there is at least a segment + * waiting to send) and we have 2 or more + * segments outstanding. There is no sense + * of sending a little piece. Lets defer and + * and wait until we can send a whole + * segment. + */ + len = 0; + } + if ((tp->t_flags & TF_FORCEDATA) && (bbr->rc_in_persist)) { + /* + * We are in persists, figure out if + * a retransmit is available (maybe the previous + * persists we sent) or if we have to send new + * data. + */ + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + if (rsm) { + len = rsm->r_end - rsm->r_start; + if (rsm->r_flags & BBR_HAS_FIN) + len--; + if ((bbr->rc_resends_use_tso == 0) && (len > maxseg)) + len = maxseg; + if (len > 1) + BBR_STAT_INC(bbr_persist_reneg); + /* + * XXXrrs we could force the len to + * 1 byte here to cause the chunk to + * split apart.. but that would then + * mean we always retransmit it as + * one byte even after the window + * opens. + */ + sack_rxmit = 1; + sb_offset = rsm->r_start - tp->snd_una; + } else { + /* + * First time through in persists or peer + * acked our one byte. Though we do have + * to have something in the sb. + */ + len = 1; + sb_offset = 0; + if (avail == 0) + len = 0; + } + } + } + } + if (prefetch_so_done == 0) { + kern_prefetch(so, &prefetch_so_done); + prefetch_so_done = 1; + } + /* + * Lop off SYN bit if it has already been sent. However, if this is + * SYN-SENT state and if segment contains data and if we don't know + * that foreign host supports TAO, suppress sending segment. + */ + if ((flags & TH_SYN) && (rsm == NULL) && + SEQ_GT(tp->snd_max, tp->snd_una)) { + if (tp->t_state != TCPS_SYN_RECEIVED) + flags &= ~TH_SYN; + /* + * When sending additional segments following a TFO SYN|ACK, + * do not include the SYN bit. + */ + if (IS_FASTOPEN(tp->t_flags) && + (tp->t_state == TCPS_SYN_RECEIVED)) + flags &= ~TH_SYN; + sb_offset--, len++; + if (sbavail(sb) == 0) + len = 0; + } else if ((flags & TH_SYN) && rsm) { + /* + * Subtract one from the len for the SYN being + * retransmitted. + */ + len--; + } + /* + * Be careful not to send data and/or FIN on SYN segments. This + * measure is needed to prevent interoperability problems with not + * fully conformant TCP implementations. + */ + if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) { + len = 0; + flags &= ~TH_FIN; + } + /* + * On TFO sockets, ensure no data is sent in the following cases: + * + * - When retransmitting SYN|ACK on a passively-created socket + * - When retransmitting SYN on an actively created socket + * - When sending a zero-length cookie (cookie request) on an + * actively created socket + * - When the socket is in the CLOSED state (RST is being sent) + */ + if (IS_FASTOPEN(tp->t_flags) && + (((flags & TH_SYN) && (tp->t_rxtshift > 0)) || + ((tp->t_state == TCPS_SYN_SENT) && + (tp->t_tfo_client_cookie_len == 0)) || + (flags & TH_RST))) { + len = 0; + sack_rxmit = 0; + rsm = NULL; + } + /* Without fast-open there should never be data sent on a SYN */ + if ((flags & TH_SYN) && (!IS_FASTOPEN(tp->t_flags))) + len = 0; + if (len <= 0) { + /* + * If FIN has been sent but not acked, but we haven't been + * called to retransmit, len will be < 0. Otherwise, window + * shrank after we sent into it. If window shrank to 0, + * cancel pending retransmit, pull snd_nxt back to (closed) + * window, and set the persist timer if it isn't already + * going. If the window didn't close completely, just wait + * for an ACK. + * + * We also do a general check here to ensure that we will + * set the persist timer when we have data to send, but a + * 0-byte window. This makes sure the persist timer is set + * even if the packet hits one of the "goto send" lines + * below. + */ + len = 0; + if ((tp->snd_wnd == 0) && + (TCPS_HAVEESTABLISHED(tp->t_state)) && + (tp->snd_una == tp->snd_max) && + (sb_offset < (int)sbavail(sb))) { + /* + * Not enough room in the rwnd to send + * a paced segment out. + */ + bbr_enter_persist(tp, bbr, cts, __LINE__); + } + } else if ((rsm == NULL) && + (doing_tlp == 0) && + (len < bbr->r_ctl.rc_pace_max_segs)) { + /* + * We are not sending a full segment for + * some reason. Should we not send anything (think + * sws or persists)? + */ + if ((tp->snd_wnd < min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && + (TCPS_HAVEESTABLISHED(tp->t_state)) && + (len < (int)(sbavail(sb) - sb_offset))) { + /* + * Here the rwnd is less than + * the pacing size, this is not a retransmit, + * we are established and + * the send is not the last in the socket buffer + * lets not send, and possibly enter persists. + */ + len = 0; + if (tp->snd_max == tp->snd_una) + bbr_enter_persist(tp, bbr, cts, __LINE__); + } else if ((tp->snd_cwnd >= bbr->r_ctl.rc_pace_max_segs) && + (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) && + (len < (int)(sbavail(sb) - sb_offset)) && + (len < bbr_minseg(bbr))) { + /* + * Here we are not retransmitting, and + * the cwnd is not so small that we could + * not send at least a min size (rxt timer + * not having gone off), We have 2 segments or + * more already in flight, its not the tail end + * of the socket buffer and the cwnd is blocking + * us from sending out minimum pacing segment size. + * Lets not send anything. + */ + bbr->rc_cwnd_limited = 1; + len = 0; + } else if (((tp->snd_wnd - ctf_outstanding(tp)) < + min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) && + (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes)) > (2 * maxseg)) && + (len < (int)(sbavail(sb) - sb_offset)) && + (TCPS_HAVEESTABLISHED(tp->t_state))) { + /* + * Here we have a send window but we have + * filled it up and we can't send another pacing segment. + * We also have in flight more than 2 segments + * and we are not completing the sb i.e. we allow + * the last bytes of the sb to go out even if + * its not a full pacing segment. + */ + len = 0; + } + } + /* len will be >= 0 after this point. */ + KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); + tcp_sndbuf_autoscale(tp, so, sendwin); + /* + * + */ + if (bbr->rc_in_persist && + len && + (rsm == NULL) && + (len < min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs))) { + /* + * We are in persist, not doing a retransmit and don't have enough space + * yet to send a full TSO. So is it at the end of the sb + * if so we need to send else nuke to 0 and don't send. + */ + int sbleft; + if (sbavail(sb) > sb_offset) + sbleft = sbavail(sb) - sb_offset; + else + sbleft = 0; + if (sbleft >= min((bbr->r_ctl.rc_high_rwnd/2), bbr->r_ctl.rc_pace_max_segs)) { + /* not at end of sb lets not send */ + len = 0; + } + } + /* + * Decide if we can use TCP Segmentation Offloading (if supported by + * hardware). + * + * TSO may only be used if we are in a pure bulk sending state. The + * presence of TCP-MD5, SACK retransmits, SACK advertizements and IP + * options prevent using TSO. With TSO the TCP header is the same + * (except for the sequence number) for all generated packets. This + * makes it impossible to transmit any options which vary per + * generated segment or packet. + * + * IPv4 handling has a clear separation of ip options and ip header + * flags while IPv6 combines both in in6p_outputopts. ip6_optlen() + * does the right thing below to provide length of just ip options + * and thus checking for ipoptlen is enough to decide if ip options + * are present. + */ +#ifdef INET6 + if (isipv6) + ipoptlen = ip6_optlen(inp); + else +#endif + if (inp->inp_options) + ipoptlen = inp->inp_options->m_len - + offsetof(struct ipoption, ipopt_list); + else + ipoptlen = 0; +#if defined(IPSEC) || defined(IPSEC_SUPPORT) + /* + * Pre-calculate here as we save another lookup into the darknesses + * of IPsec that way and can actually decide if TSO is ok. + */ +#ifdef INET6 + if (isipv6 && IPSEC_ENABLED(ipv6)) + ipsec_optlen = IPSEC_HDRSIZE(ipv6, inp); +#ifdef INET + else +#endif +#endif /* INET6 */ +#ifdef INET + if (IPSEC_ENABLED(ipv4)) + ipsec_optlen = IPSEC_HDRSIZE(ipv4, inp); +#endif /* INET */ +#endif /* IPSEC */ +#if defined(IPSEC) || defined(IPSEC_SUPPORT) + ipoptlen += ipsec_optlen; +#endif + if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && + (len > maxseg) && + (tp->t_port == 0) && + ((tp->t_flags & TF_SIGNATURE) == 0) && + tp->rcv_numsacks == 0 && + ipoptlen == 0) + tso = 1; + + recwin = min(max(sbspace(&so->so_rcv), 0), + TCP_MAXWIN << tp->rcv_scale); + /* + * Sender silly window avoidance. We transmit under the following + * conditions when len is non-zero: + * + * - We have a full segment (or more with TSO) - This is the last + * buffer in a write()/send() and we are either idle or running + * NODELAY - we've timed out (e.g. persist timer) - we have more + * then 1/2 the maximum send window's worth of data (receiver may be + * limited the window size) - we need to retransmit + */ + if (rsm) + goto send; + if (len) { + if (sack_rxmit) + goto send; + if (len >= p_maxseg) + goto send; + /* + * NOTE! on localhost connections an 'ack' from the remote + * end may occur synchronously with the output and cause us + * to flush a buffer queued with moretocome. XXX + * + */ + if (((tp->t_flags & TF_MORETOCOME) == 0) && /* normal case */ + ((tp->t_flags & TF_NODELAY) || + ((uint32_t)len + (uint32_t)sb_offset) >= sbavail(&so->so_snd)) && + (tp->t_flags & TF_NOPUSH) == 0) { + goto send; + } + if ((tp->snd_una == tp->snd_max) && len) { /* Nothing outstanding */ + goto send; + } + if (tp->t_flags & TF_FORCEDATA) { /* typ. timeout case */ + goto send; + } + if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) { + goto send; + } + } + /* + * Sending of standalone window updates. + * + * Window updates are important when we close our window due to a + * full socket buffer and are opening it again after the application + * reads data from it. Once the window has opened again and the + * remote end starts to send again the ACK clock takes over and + * provides the most current window information. + * + * We must avoid the silly window syndrome whereas every read from + * the receive buffer, no matter how small, causes a window update + * to be sent. We also should avoid sending a flurry of window + * updates when the socket buffer had queued a lot of data and the + * application is doing small reads. + * + * Prevent a flurry of pointless window updates by only sending an + * update when we can increase the advertized window by more than + * 1/4th of the socket buffer capacity. When the buffer is getting + * full or is very small be more aggressive and send an update + * whenever we can increase by two mss sized segments. In all other + * situations the ACK's to new incoming data will carry further + * window increases. + * + * Don't send an independent window update if a delayed ACK is + * pending (it will get piggy-backed on it) or the remote side + * already has done a half-close and won't send more data. Skip + * this if the connection is in T/TCP half-open state. + */ + if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN) && + !(tp->t_flags & TF_DELACK) && + !TCPS_HAVERCVDFIN(tp->t_state)) { + /* Check to see if we should do a window update */ + if (bbr_window_update_needed(tp, so, recwin, maxseg)) + goto send; + } + /* + * Send if we owe the peer an ACK, RST, SYN, or urgent data. ACKNOW + * is also a catch-all for the retransmit timer timeout case. + */ + if (tp->t_flags & TF_ACKNOW) { + goto send; + } + if (((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0)) { + goto send; + } + if (SEQ_GT(tp->snd_up, tp->snd_una)) { + goto send; + } + /* + * If our state indicates that FIN should be sent and we have not + * yet done so, then we need to send. + */ + if (flags & TH_FIN && + ((tp->t_flags & TF_SENTFIN) == 0)) { + goto send; + } + /* + * No reason to send a segment, just return. + */ +just_return: + SOCKBUF_UNLOCK(sb); +just_return_nolock: + if (tot_len) + slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0); + if (bbr->rc_no_pacing) + slot = 0; + if (tot_len == 0) { + if ((ctf_outstanding(tp) + min((bbr->r_ctl.rc_high_rwnd/2), bbr_minseg(bbr))) >= + tp->snd_wnd) { + BBR_STAT_INC(bbr_rwnd_limited); + app_limited = BBR_JR_RWND_LIMITED; + bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); + if ((bbr->rc_in_persist == 0) && + TCPS_HAVEESTABLISHED(tp->t_state) && + (tp->snd_max == tp->snd_una) && + sbavail(&tp->t_inpcb->inp_socket->so_snd)) { + /* No send window.. we must enter persist */ + bbr_enter_persist(tp, bbr, bbr->r_ctl.rc_rcvtime, __LINE__); + } + } else if (ctf_outstanding(tp) >= sbavail(sb)) { + BBR_STAT_INC(bbr_app_limited); + app_limited = BBR_JR_APP_LIMITED; + bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); + } else if ((ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes)) + p_maxseg) >= tp->snd_cwnd) { + BBR_STAT_INC(bbr_cwnd_limited); + app_limited = BBR_JR_CWND_LIMITED; + bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes))); + bbr->rc_cwnd_limited = 1; + } else { + BBR_STAT_INC(bbr_app_limited); + app_limited = BBR_JR_APP_LIMITED; + bbr_cwnd_limiting(tp, bbr, ctf_outstanding(tp)); + } + bbr->r_ctl.rc_hptsi_agg_delay = 0; + bbr->r_agg_early_set = 0; + bbr->r_ctl.rc_agg_early = 0; + bbr->r_ctl.rc_last_delay_val = 0; + } else if (bbr->rc_use_google == 0) + bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); + /* Are we app limited? */ + if ((app_limited == BBR_JR_APP_LIMITED) || + (app_limited == BBR_JR_RWND_LIMITED)) { + /** + * We are application limited. + */ + bbr->r_ctl.r_app_limited_until = (ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes)) + bbr->r_ctl.rc_delivered); + } + if (tot_len == 0) + counter_u64_add(bbr_out_size[TCP_MSS_ACCT_JUSTRET], 1); + tp->t_flags &= ~TF_FORCEDATA; + /* Dont update the time if we did not send */ + bbr->r_ctl.rc_last_delay_val = 0; + bbr->rc_output_starts_timer = 1; + bbr_start_hpts_timer(bbr, tp, cts, 9, slot, tot_len); + bbr_log_type_just_return(bbr, cts, tot_len, hpts_calling, app_limited, p_maxseg, len); + if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { + /* Make sure snd_nxt is drug up */ + tp->snd_nxt = tp->snd_max; + } + return (error); + +send: + if (doing_tlp == 0) { + /* + * Data not a TLP, and its not the rxt firing. If it is the + * rxt firing, we want to leave the tlp_in_progress flag on + * so we don't send another TLP. It has to be a rack timer + * or normal send (response to acked data) to clear the tlp + * in progress flag. + */ + bbr->rc_tlp_in_progress = 0; + bbr->rc_tlp_rtx_out = 0; + } else { + /* + * Its a TLP. + */ + bbr->rc_tlp_in_progress = 1; + } + bbr_timer_cancel(bbr, __LINE__, cts); + if (rsm == NULL) { + if (sbused(sb) > 0) { + /* + * This is sub-optimal. We only send a stand alone + * FIN on its own segment. + */ + if (flags & TH_FIN) { + flags &= ~TH_FIN; + if ((len == 0) && ((tp->t_flags & TF_ACKNOW) == 0)) { + /* Lets not send this */ + slot = 0; + goto just_return; + } + } + } + } else { + /* + * We do *not* send a FIN on a retransmit if it has data. + * The if clause here where len > 1 should never come true. + */ + if ((len > 0) && + (((rsm->r_flags & BBR_HAS_FIN) == 0) && + (flags & TH_FIN))) { + flags &= ~TH_FIN; + len--; + } + } + SOCKBUF_LOCK_ASSERT(sb); + if (len > 0) { + if ((tp->snd_una == tp->snd_max) && + (bbr_calc_time(cts, bbr->r_ctl.rc_went_idle_time) >= bbr_rtt_probe_time)) { + /* + * This qualifies as a RTT_PROBE session since we + * drop the data outstanding to nothing and waited + * more than bbr_rtt_probe_time. + */ + bbr_log_rtt_shrinks(bbr, cts, 0, 0, __LINE__, BBR_RTTS_WASIDLE, 0); + bbr_set_reduced_rtt(bbr, cts, __LINE__); + } + if (len >= maxseg) + tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT; + else + tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT; + } + /* + * Before ESTABLISHED, force sending of initial options unless TCP + * set not to do any options. NOTE: we assume that the IP/TCP header + * plus TCP options always fit in a single mbuf, leaving room for a + * maximum link header, i.e. max_linkhdr + sizeof (struct tcpiphdr) + * + optlen <= MCLBYTES + */ + optlen = 0; +#ifdef INET6 + if (isipv6) + hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr); + else +#endif + hdrlen = sizeof(struct tcpiphdr); + + /* + * Compute options for segment. We only have to care about SYN and + * established connection segments. Options for SYN-ACK segments + * are handled in TCP syncache. + */ + to.to_flags = 0; + local_options = 0; + if ((tp->t_flags & TF_NOOPT) == 0) { + /* Maximum segment size. */ + if (flags & TH_SYN) { + to.to_mss = tcp_mssopt(&inp->inp_inc); +#ifdef NETFLIX_TCPOUDP + if (tp->t_port) + to.to_mss -= V_tcp_udp_tunneling_overhead; +#endif + to.to_flags |= TOF_MSS; + /* + * On SYN or SYN|ACK transmits on TFO connections, + * only include the TFO option if it is not a + * retransmit, as the presence of the TFO option may + * have caused the original SYN or SYN|ACK to have + * been dropped by a middlebox. + */ + if (IS_FASTOPEN(tp->t_flags) && + (tp->t_rxtshift == 0)) { + if (tp->t_state == TCPS_SYN_RECEIVED) { + to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN; + to.to_tfo_cookie = + (u_int8_t *)&tp->t_tfo_cookie.server; + to.to_flags |= TOF_FASTOPEN; + wanted_cookie = 1; + } else if (tp->t_state == TCPS_SYN_SENT) { + to.to_tfo_len = + tp->t_tfo_client_cookie_len; + to.to_tfo_cookie = + tp->t_tfo_cookie.client; + to.to_flags |= TOF_FASTOPEN; + wanted_cookie = 1; + } + } + } + /* Window scaling. */ + if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) { + to.to_wscale = tp->request_r_scale; + to.to_flags |= TOF_SCALE; + } + /* Timestamps. */ + if ((tp->t_flags & TF_RCVD_TSTMP) || + ((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) { + to.to_tsval = tcp_tv_to_mssectick(&bbr->rc_tv) + tp->ts_offset; + to.to_tsecr = tp->ts_recent; + to.to_flags |= TOF_TS; + local_options += TCPOLEN_TIMESTAMP + 2; + } + /* Set receive buffer autosizing timestamp. */ + if (tp->rfbuf_ts == 0 && + (so->so_rcv.sb_flags & SB_AUTOSIZE)) + tp->rfbuf_ts = tcp_tv_to_mssectick(&bbr->rc_tv); + /* Selective ACK's. */ + if (flags & TH_SYN) + to.to_flags |= TOF_SACKPERM; + else if (TCPS_HAVEESTABLISHED(tp->t_state) && + tp->rcv_numsacks > 0) { + to.to_flags |= TOF_SACK; + to.to_nsacks = tp->rcv_numsacks; + to.to_sacks = (u_char *)tp->sackblks; + } +#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) + /* TCP-MD5 (RFC2385). */ + if (tp->t_flags & TF_SIGNATURE) + to.to_flags |= TOF_SIGNATURE; +#endif /* TCP_SIGNATURE */ + + /* Processing the options. */ + hdrlen += (optlen = tcp_addoptions(&to, opt)); + /* + * If we wanted a TFO option to be added, but it was unable + * to fit, ensure no data is sent. + */ + if (IS_FASTOPEN(tp->t_flags) && wanted_cookie && + !(to.to_flags & TOF_FASTOPEN)) + len = 0; + } +#ifdef NETFLIX_TCPOUDP + if (tp->t_port) { + if (V_tcp_udp_tunneling_port == 0) { + /* The port was removed?? */ + SOCKBUF_UNLOCK(&so->so_snd); + return (EHOSTUNREACH); + } + + hdrlen += sizeof(struct udphdr); + } +#endif +#ifdef INET6 + if (isipv6) + ipoptlen = ip6_optlen(tp->t_inpcb); + else +#endif + if (tp->t_inpcb->inp_options) + ipoptlen = tp->t_inpcb->inp_options->m_len - + offsetof(struct ipoption, ipopt_list); + else + ipoptlen = 0; + ipoptlen = 0; +#if defined(IPSEC) || defined(IPSEC_SUPPORT) + ipoptlen += ipsec_optlen; +#endif + if (bbr->rc_last_options != local_options) { + /* + * Cache the options length this generally does not change + * on a connection. We use this to calculate TSO. + */ + bbr->rc_last_options = local_options; + } + maxseg = tp->t_maxseg - (ipoptlen + optlen); + p_maxseg = min(maxseg, pace_max_segs); + /* + * Adjust data length if insertion of options will bump the packet + * length beyond the t_maxseg length. Clear the FIN bit because we + * cut off the tail of the segment. + */ +#ifdef KERN_TLS + /* force TSO for so TLS offload can get mss */ + if (sb->sb_flags & SB_TLS_IFNET) { + force_tso = 1; + } +#endif + + if (len > maxseg) { + if (len != 0 && (flags & TH_FIN)) { + flags &= ~TH_FIN; + } + if (tso) { + uint32_t moff; + int32_t max_len; + + /* extract TSO information */ + if_hw_tsomax = tp->t_tsomax; + if_hw_tsomaxsegcount = tp->t_tsomaxsegcount; + if_hw_tsomaxsegsize = tp->t_tsomaxsegsize; + KASSERT(ipoptlen == 0, + ("%s: TSO can't do IP options", __func__)); + + /* + * Check if we should limit by maximum payload + * length: + */ + if (if_hw_tsomax != 0) { + /* compute maximum TSO length */ + max_len = (if_hw_tsomax - hdrlen - + max_linkhdr); + if (max_len <= 0) { + len = 0; + } else if (len > max_len) { + len = max_len; + } + } + /* + * Prevent the last segment from being fractional + * unless the send sockbuf can be emptied: + */ + if (((sb_offset + len) < sbavail(sb)) && + (hw_tls == 0)) { + moff = len % (uint32_t)maxseg; + if (moff != 0) { + len -= moff; + } + } + /* + * In case there are too many small fragments don't + * use TSO: + */ + if (len <= maxseg) { + len = maxseg; + tso = 0; + } + } else { + /* Not doing TSO */ + if (optlen + ipoptlen > tp->t_maxseg) { + /* + * Since we don't have enough space to put + * the IP header chain and the TCP header in + * one packet as required by RFC 7112, don't + * send it. + */ + SOCKBUF_UNLOCK(&so->so_snd); + error = EMSGSIZE; + sack_rxmit = 0; + goto out; + } + len = maxseg; + } + } else { + /* Not doing TSO */ + if_hw_tsomaxsegcount = 0; + tso = 0; + } + KASSERT(len + hdrlen + ipoptlen <= IP_MAXPACKET, + ("%s: len > IP_MAXPACKET", __func__)); +#ifdef DIAGNOSTIC +#ifdef INET6 + if (max_linkhdr + hdrlen > MCLBYTES) +#else + if (max_linkhdr + hdrlen > MHLEN) +#endif + panic("tcphdr too big"); +#endif + /* + * This KASSERT is here to catch edge cases at a well defined place. + * Before, those had triggered (random) panic conditions further + * down. + */ +#ifdef BBR_INVARIANTS + if (sack_rxmit) { + if (SEQ_LT(rsm->r_start, tp->snd_una)) { + panic("RSM:%p TP:%p bbr:%p start:%u is < snd_una:%u", + rsm, tp, bbr, rsm->r_start, tp->snd_una); + } + } +#endif + KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); + if ((len == 0) && + (flags & TH_FIN) && + (sbused(sb))) { + /* + * We have outstanding data, don't send a fin by itself!. + */ + slot = 0; + goto just_return; + } + /* + * Grab a header mbuf, attaching a copy of data to be transmitted, + * and initialize the header from the template for sends on this + * connection. + */ + if (len) { + uint32_t moff; + uint32_t orig_len; + + /* + * We place a limit on sending with hptsi. + */ + if ((rsm == NULL) && len > pace_max_segs) + len = pace_max_segs; + if (len <= maxseg) + tso = 0; +#ifdef INET6 + if (MHLEN < hdrlen + max_linkhdr) + m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); + else +#endif + m = m_gethdr(M_NOWAIT, MT_DATA); + + if (m == NULL) { + BBR_STAT_INC(bbr_failed_mbuf_aloc); + bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0); + SOCKBUF_UNLOCK(sb); + error = ENOBUFS; + sack_rxmit = 0; + goto out; + } + m->m_data += max_linkhdr; + m->m_len = hdrlen; + /* + * Start the m_copy functions from the closest mbuf to the + * sb_offset in the socket buffer chain. + */ + if ((sb_offset > sbavail(sb)) || ((len + sb_offset) > sbavail(sb))) { +#ifdef BBR_INVARIANTS + if ((len + sb_offset) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) + panic("tp:%p bbr:%p len:%u sb_offset:%u sbavail:%u rsm:%p %u:%u:%u", + tp, bbr, len, sb_offset, sbavail(sb), rsm, + doing_retran_from, + picked_up_retran, + doing_tlp); + +#endif + /* + * In this messed up situation we have two choices, + * a) pretend the send worked, and just start timers + * and what not (not good since that may lead us + * back here a lot). <or> b) Send the lowest segment + * in the map. <or> c) Drop the connection. Lets do + * <b> which if it continues to happen will lead to + * <c> via timeouts. + */ + BBR_STAT_INC(bbr_offset_recovery); + rsm = TAILQ_FIRST(&bbr->r_ctl.rc_map); + sb_offset = 0; + if (rsm == NULL) { + sack_rxmit = 0; + len = sbavail(sb); + } else { + sack_rxmit = 1; + if (rsm->r_start != tp->snd_una) { + /* + * Things are really messed up, <c> + * is the only thing to do. + */ + BBR_STAT_INC(bbr_offset_drop); + tcp_set_inp_to_drop(inp, EFAULT); + return (0); + } + len = rsm->r_end - rsm->r_start; + } + if (len > sbavail(sb)) + len = sbavail(sb); + if (len > maxseg) + len = maxseg; + } + mb = sbsndptr_noadv(sb, sb_offset, &moff); + if (len <= MHLEN - hdrlen - max_linkhdr && !hw_tls) { + m_copydata(mb, moff, (int)len, + mtod(m, caddr_t)+hdrlen); + if (rsm == NULL) + sbsndptr_adv(sb, mb, len); + m->m_len += len; + } else { + struct sockbuf *msb; + + if (rsm) + msb = NULL; + else + msb = sb; +#ifdef BBR_INVARIANTS + if ((len + moff) > (sbavail(sb) + ((flags & (TH_FIN | TH_SYN)) ? 1 : 0))) { + if (rsm) { + panic("tp:%p bbr:%p len:%u moff:%u sbavail:%u rsm:%p snd_una:%u rsm_start:%u flg:%x %u:%u:%u sr:%d ", + tp, bbr, len, moff, + sbavail(sb), rsm, + tp->snd_una, rsm->r_flags, rsm->r_start, + doing_retran_from, + picked_up_retran, + doing_tlp, sack_rxmit); + } else { + panic("tp:%p bbr:%p len:%u moff:%u sbavail:%u sb_offset:%u snd_una:%u", + tp, bbr, len, moff, sbavail(sb), sb_offset, tp->snd_una); + } + } +#endif + orig_len = len; + m->m_next = tcp_m_copym( +#ifdef NETFLIX_COPY_ARGS + tp, +#endif + mb, moff, &len, + if_hw_tsomaxsegcount, + if_hw_tsomaxsegsize, msb, + ((rsm == NULL) ? hw_tls : 0) +#ifdef NETFLIX_COPY_ARGS + , &filled_all +#endif + ); + if (len <= maxseg && !force_tso) { + /* + * Must have ran out of mbufs for the copy + * shorten it to no longer need tso. Lets + * not put on sendalot since we are low on + * mbufs. + */ + tso = 0; + } + if (m->m_next == NULL) { + SOCKBUF_UNLOCK(sb); + (void)m_free(m); + error = ENOBUFS; + sack_rxmit = 0; + goto out; + } + } +#ifdef BBR_INVARIANTS + if (tso && len < maxseg) { + panic("tp:%p tso on, but len:%d < maxseg:%d", + tp, len, maxseg); + } + if (tso && if_hw_tsomaxsegcount) { + int32_t seg_cnt = 0; + struct mbuf *foo; + + foo = m; + while (foo) { + seg_cnt++; + foo = foo->m_next; + } + if (seg_cnt > if_hw_tsomaxsegcount) { + panic("seg_cnt:%d > max:%d", seg_cnt, if_hw_tsomaxsegcount); + } + } +#endif + /* + * If we're sending everything we've got, set PUSH. (This + * will keep happy those implementations which only give + * data to the user when a buffer fills or a PUSH comes in.) + */ + if (sb_offset + len == sbused(sb) && + sbused(sb) && + !(flags & TH_SYN)) { + flags |= TH_PUSH; + } + SOCKBUF_UNLOCK(sb); + } else { + SOCKBUF_UNLOCK(sb); + if (tp->t_flags & TF_ACKNOW) + TCPSTAT_INC(tcps_sndacks); + else if (flags & (TH_SYN | TH_FIN | TH_RST)) + TCPSTAT_INC(tcps_sndctrl); + else if (SEQ_GT(tp->snd_up, tp->snd_una)) + TCPSTAT_INC(tcps_sndurg); + else + TCPSTAT_INC(tcps_sndwinup); + + m = m_gethdr(M_NOWAIT, MT_DATA); + if (m == NULL) { + BBR_STAT_INC(bbr_failed_mbuf_aloc); + bbr_log_enobuf_jmp(bbr, len, cts, __LINE__, len, 0, 0); + error = ENOBUFS; + /* Fudge the send time since we could not send */ + sack_rxmit = 0; + goto out; + } +#ifdef INET6 + if (isipv6 && (MHLEN < hdrlen + max_linkhdr) && + MHLEN >= hdrlen) { + M_ALIGN(m, hdrlen); + } else +#endif + m->m_data += max_linkhdr; + m->m_len = hdrlen; + } + SOCKBUF_UNLOCK_ASSERT(sb); + m->m_pkthdr.rcvif = (struct ifnet *)0; +#ifdef MAC + mac_inpcb_create_mbuf(inp, m); +#endif +#ifdef INET6 + if (isipv6) { + ip6 = mtod(m, struct ip6_hdr *); +#ifdef NETFLIX_TCPOUDP + if (tp->t_port) { + udp = (struct udphdr *)((caddr_t)ip6 + ipoptlen + sizeof(struct ip6_hdr)); + udp->uh_sport = htons(V_tcp_udp_tunneling_port); + udp->uh_dport = tp->t_port; + ulen = hdrlen + len - sizeof(struct ip6_hdr); + udp->uh_ulen = htons(ulen); + th = (struct tcphdr *)(udp + 1); + } else { +#endif + th = (struct tcphdr *)(ip6 + 1); + +#ifdef NETFLIX_TCPOUDP + } +#endif + tcpip_fillheaders(inp, +#ifdef NETFLIX_TCPOUDP + tp->t_port, +#endif + ip6, th); + } else +#endif /* INET6 */ + { + ip = mtod(m, struct ip *); +#ifdef TCPDEBUG + ipov = (struct ipovly *)ip; +#endif +#ifdef NETFLIX_TCPOUDP + if (tp->t_port) { + udp = (struct udphdr *)((caddr_t)ip + ipoptlen + sizeof(struct ip)); + udp->uh_sport = htons(V_tcp_udp_tunneling_port); + udp->uh_dport = tp->t_port; + ulen = hdrlen + len - sizeof(struct ip); + udp->uh_ulen = htons(ulen); + th = (struct tcphdr *)(udp + 1); + } else +#endif + th = (struct tcphdr *)(ip + 1); + tcpip_fillheaders(inp, +#ifdef NETFLIX_TCPOUDP + tp->t_port, +#endif + ip, th); + } + /* + * If we are doing retransmissions, then snd_nxt will not reflect + * the first unsent octet. For ACK only packets, we do not want the + * sequence number of the retransmitted packet, we want the sequence + * number of the next unsent octet. So, if there is no data (and no + * SYN or FIN), use snd_max instead of snd_nxt when filling in + * ti_seq. But if we are in persist state, snd_max might reflect + * one byte beyond the right edge of the window, so use snd_nxt in + * that case, since we know we aren't doing a retransmission. + * (retransmit and persist are mutually exclusive...) + */ + if (sack_rxmit == 0) { + if (len && ((flags & (TH_FIN | TH_SYN | TH_RST)) == 0)) { + /* New data (including new persists) */ + th->th_seq = htonl(tp->snd_max); + bbr_seq = tp->snd_max; + } else if (flags & TH_SYN) { + /* Syn's always send from iss */ + th->th_seq = htonl(tp->iss); + bbr_seq = tp->iss; + } else if (flags & TH_FIN) { + if (flags & TH_FIN && tp->t_flags & TF_SENTFIN) { + /* + * If we sent the fin already its 1 minus + * snd_max + */ + th->th_seq = (htonl(tp->snd_max - 1)); + bbr_seq = (tp->snd_max - 1); + } else { + /* First time FIN use snd_max */ + th->th_seq = htonl(tp->snd_max); + bbr_seq = tp->snd_max; + } + } else if (flags & TH_RST) { + /* + * For a Reset send the last cum ack in sequence + * (this like any other choice may still generate a + * challenge ack, if a ack-update packet is in + * flight). + */ + th->th_seq = htonl(tp->snd_una); + bbr_seq = tp->snd_una; + } else { + /* + * len == 0 and not persist we use snd_max, sending + * an ack unless we have sent the fin then its 1 + * minus. + */ + /* + * XXXRRS Question if we are in persists and we have + * nothing outstanding to send and we have not sent + * a FIN, we will send an ACK. In such a case it + * might be better to send (tp->snd_una - 1) which + * would force the peer to ack. + */ + if (tp->t_flags & TF_SENTFIN) { + th->th_seq = htonl(tp->snd_max - 1); + bbr_seq = (tp->snd_max - 1); + } else { + th->th_seq = htonl(tp->snd_max); + bbr_seq = tp->snd_max; + } + } + } else { + /* All retransmits use the rsm to guide the send */ + th->th_seq = htonl(rsm->r_start); + bbr_seq = rsm->r_start; + } + th->th_ack = htonl(tp->rcv_nxt); + if (optlen) { + bcopy(opt, th + 1, optlen); + th->th_off = (sizeof(struct tcphdr) + optlen) >> 2; + } + th->th_flags = flags; + /* + * Calculate receive window. Don't shrink window, but avoid silly + * window syndrome. + */ + if ((flags & TH_RST) || ((recwin < (so->so_rcv.sb_hiwat / 4) && + recwin < maxseg))) + recwin = 0; + if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) && + recwin < (tp->rcv_adv - tp->rcv_nxt)) + recwin = (tp->rcv_adv - tp->rcv_nxt); + if (recwin > TCP_MAXWIN << tp->rcv_scale) + recwin = TCP_MAXWIN << tp->rcv_scale; + + /* + * According to RFC1323 the window field in a SYN (i.e., a <SYN> or + * <SYN,ACK>) segment itself is never scaled. The <SYN,ACK> case is + * handled in syncache. + */ + if (flags & TH_SYN) + th->th_win = htons((u_short) + (min(sbspace(&so->so_rcv), TCP_MAXWIN))); + else + th->th_win = htons((u_short)(recwin >> tp->rcv_scale)); + /* + * Adjust the RXWIN0SENT flag - indicate that we have advertised a 0 + * window. This may cause the remote transmitter to stall. This + * flag tells soreceive() to disable delayed acknowledgements when + * draining the buffer. This can occur if the receiver is + * attempting to read more data than can be buffered prior to + * transmitting on the connection. + */ + if (th->th_win == 0) { + tp->t_sndzerowin++; + tp->t_flags |= TF_RXWIN0SENT; + } else + tp->t_flags &= ~TF_RXWIN0SENT; + if (SEQ_GT(tp->snd_up, tp->snd_max)) { + th->th_urp = htons((u_short)(tp->snd_up - tp->snd_max)); + th->th_flags |= TH_URG; + } else + /* + * If no urgent pointer to send, then we pull the urgent + * pointer to the left edge of the send window so that it + * doesn't drift into the send window on sequence number + * wraparound. + */ + tp->snd_up = tp->snd_una; /* drag it along */ + +#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) + if (to.to_flags & TOF_SIGNATURE) { + /* + * Calculate MD5 signature and put it into the place + * determined before. NOTE: since TCP options buffer doesn't + * point into mbuf's data, calculate offset and use it. + */ + if (!TCPMD5_ENABLED() || TCPMD5_OUTPUT(m, th, + (u_char *)(th + 1) + (to.to_signature - opt)) != 0) { + /* + * Do not send segment if the calculation of MD5 + * digest has failed. + */ + goto out; + } + } +#endif + + /* + * Put TCP length in extended header, and then checksum extended + * header and data. + */ + m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */ +#ifdef INET6 + if (isipv6) { + /* + * ip6_plen is not need to be filled now, and will be filled + * in ip6_output. + */ +#ifdef NETFLIX_TCPOUDP + if (tp->t_port) { + m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; + m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); + udp->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0); + th->th_sum = htons(0); + UDPSTAT_INC(udps_opackets); + } else { +#endif + csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP_IPV6; + m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); + th->th_sum = in6_cksum_pseudo(ip6, sizeof(struct tcphdr) + + optlen + len, IPPROTO_TCP, 0); +#ifdef NETFLIX_TCPOUDP + } +#endif + } +#endif +#if defined(INET6) && defined(INET) + else +#endif +#ifdef INET + { +#ifdef NETFLIX_TCPOUDP + if (tp->t_port) { + m->m_pkthdr.csum_flags = CSUM_UDP; + m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); + udp->uh_sum = in_pseudo(ip->ip_src.s_addr, + ip->ip_dst.s_addr, htons(ulen + IPPROTO_UDP)); + th->th_sum = htons(0); + UDPSTAT_INC(udps_opackets); + } else { +#endif + csum_flags = m->m_pkthdr.csum_flags = CSUM_TCP; + m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); + th->th_sum = in_pseudo(ip->ip_src.s_addr, + ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) + + IPPROTO_TCP + len + optlen)); +#ifdef NETFLIX_TCPOUDP + } +#endif + /* IP version must be set here for ipv4/ipv6 checking later */ + KASSERT(ip->ip_v == IPVERSION, + ("%s: IP version incorrect: %d", __func__, ip->ip_v)); + } +#endif + + /* + * Enable TSO and specify the size of the segments. The TCP pseudo + * header checksum is always provided. XXX: Fixme: This is currently + * not the case for IPv6. + */ + if (tso || force_tso) { + KASSERT(force_tso || len > maxseg, + ("%s: len:%d <= tso_segsz:%d", __func__, len, maxseg)); + m->m_pkthdr.csum_flags |= CSUM_TSO; + csum_flags |= CSUM_TSO; + m->m_pkthdr.tso_segsz = maxseg; + } + KASSERT(len + hdrlen == m_length(m, NULL), + ("%s: mbuf chain different than expected: %d + %u != %u", + __func__, len, hdrlen, m_length(m, NULL))); + +#ifdef TCP_HHOOK + /* Run HHOOK_TC_ESTABLISHED_OUT helper hooks. */ + hhook_run_tcp_est_out(tp, th, &to, len, tso); +#endif +#ifdef TCPDEBUG + /* + * Trace. + */ + if (so->so_options & SO_DEBUG) { + u_short save = 0; + +#ifdef INET6 + if (!isipv6) +#endif + { + save = ipov->ih_len; + ipov->ih_len = htons(m->m_pkthdr.len /* - hdrlen + + * (th->th_off << 2) */ ); + } + tcp_trace(TA_OUTPUT, tp->t_state, tp, mtod(m, void *), th, 0); +#ifdef INET6 + if (!isipv6) +#endif + ipov->ih_len = save; + } +#endif /* TCPDEBUG */ + + /* Log to the black box */ + if (tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + + bbr_fill_in_logging_data(bbr, &log.u_bbr, cts); + /* Record info on type of transmission */ + log.u_bbr.flex1 = bbr->r_ctl.rc_hptsi_agg_delay; + log.u_bbr.flex2 = (bbr->r_recovery_bw << 3); + log.u_bbr.flex3 = maxseg; + log.u_bbr.flex4 = delay_calc; + /* Encode filled_all into the upper flex5 bit */ + log.u_bbr.flex5 = bbr->rc_past_init_win; + log.u_bbr.flex5 <<= 1; + log.u_bbr.flex5 |= bbr->rc_no_pacing; + log.u_bbr.flex5 <<= 29; + if (filled_all) + log.u_bbr.flex5 |= 0x80000000; + log.u_bbr.flex5 |= tp->t_maxseg; + log.u_bbr.flex6 = bbr->r_ctl.rc_pace_max_segs; + log.u_bbr.flex7 = (bbr->rc_bbr_state << 8) | bbr_state_val(bbr); + /* lets poke in the low and the high here for debugging */ + log.u_bbr.pkts_out = bbr->rc_tp->t_maxseg; + if (rsm || sack_rxmit) { + if (doing_tlp) + log.u_bbr.flex8 = 2; + else + log.u_bbr.flex8 = 1; + } else { + log.u_bbr.flex8 = 0; + } + lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK, + len, &log, false, NULL, NULL, 0, tv); + } else { + lgb = NULL; + } + /* + * Fill in IP length and desired time to live and send to IP level. + * There should be a better way to handle ttl and tos; we could keep + * them in the template, but need a way to checksum without them. + */ + /* + * m->m_pkthdr.len should have been set before cksum calcuration, + * because in6_cksum() need it. + */ +#ifdef INET6 + if (isipv6) { + /* + * we separately set hoplimit for every segment, since the + * user might want to change the value via setsockopt. Also, + * desired default hop limit might be changed via Neighbor + * Discovery. + */ + ip6->ip6_hlim = in6_selecthlim(inp, NULL); + + /* + * Set the packet size here for the benefit of DTrace + * probes. ip6_output() will set it properly; it's supposed + * to include the option header lengths as well. + */ + ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); + + if (V_path_mtu_discovery && maxseg > V_tcp_minmss) + tp->t_flags2 |= TF2_PLPMTU_PMTUD; + else + tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; + + if (tp->t_state == TCPS_SYN_SENT) + TCP_PROBE5(connect__request, NULL, tp, ip6, tp, th); + + TCP_PROBE5(send, NULL, tp, ip6, tp, th); + /* TODO: IPv6 IP6TOS_ECT bit on */ + error = ip6_output(m, inp->in6p_outputopts, + &inp->inp_route6, + ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), + NULL, NULL, inp); + + if (error == EMSGSIZE && inp->inp_route6.ro_rt != NULL) + mtu = inp->inp_route6.ro_rt->rt_mtu; + } +#endif /* INET6 */ +#if defined(INET) && defined(INET6) + else +#endif +#ifdef INET + { + ip->ip_len = htons(m->m_pkthdr.len); +#ifdef INET6 + if (isipv6) + ip->ip_ttl = in6_selecthlim(inp, NULL); +#endif /* INET6 */ + /* + * If we do path MTU discovery, then we set DF on every + * packet. This might not be the best thing to do according + * to RFC3390 Section 2. However the tcp hostcache migitates + * the problem so it affects only the first tcp connection + * with a host. + * + * NB: Don't set DF on small MTU/MSS to have a safe + * fallback. + */ + if (V_path_mtu_discovery && tp->t_maxseg > V_tcp_minmss) { + tp->t_flags2 |= TF2_PLPMTU_PMTUD; + if (tp->t_port == 0 || len < V_tcp_minmss) { + ip->ip_off |= htons(IP_DF); + } + } else { + tp->t_flags2 &= ~TF2_PLPMTU_PMTUD; + } + + if (tp->t_state == TCPS_SYN_SENT) + TCP_PROBE5(connect__request, NULL, tp, ip, tp, th); + + TCP_PROBE5(send, NULL, tp, ip, tp, th); + + error = ip_output(m, inp->inp_options, &inp->inp_route, + ((rsm || sack_rxmit) ? IP_NO_SND_TAG_RL : 0), 0, + inp); + if (error == EMSGSIZE && inp->inp_route.ro_rt != NULL) + mtu = inp->inp_route.ro_rt->rt_mtu; + } +#endif /* INET */ +out: + + if (lgb) { + lgb->tlb_errno = error; + lgb = NULL; + } + /* + * In transmit state, time the transmission and arrange for the + * retransmit. In persist state, just set snd_max. + */ + if (error == 0) { + if (TCPS_HAVEESTABLISHED(tp->t_state) && + (tp->t_flags & TF_SACK_PERMIT) && + tp->rcv_numsacks > 0) + tcp_clean_dsack_blocks(tp); + /* We sent an ack clear the bbr_segs_rcvd count */ + bbr->output_error_seen = 0; + bbr->oerror_cnt = 0; + bbr->bbr_segs_rcvd = 0; + if (len == 0) + counter_u64_add(bbr_out_size[TCP_MSS_ACCT_SNDACK], 1); + else if (hw_tls) { + if (filled_all || + (len >= bbr->r_ctl.rc_pace_max_segs)) + BBR_STAT_INC(bbr_meets_tso_thresh); + else { + if (doing_tlp) { + BBR_STAT_INC(bbr_miss_tlp); + bbr_log_type_hrdwtso(tp, bbr, len, 1, what_we_can); + + + } else if (rsm) { + BBR_STAT_INC(bbr_miss_retran); + bbr_log_type_hrdwtso(tp, bbr, len, 2, what_we_can); + } else if ((ctf_outstanding(tp) + bbr->r_ctl.rc_pace_max_segs) > sbavail(sb)) { + BBR_STAT_INC(bbr_miss_tso_app); + bbr_log_type_hrdwtso(tp, bbr, len, 3, what_we_can); + } else if ((ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes)) + bbr->r_ctl.rc_pace_max_segs) > tp->snd_cwnd) { + BBR_STAT_INC(bbr_miss_tso_cwnd); + bbr_log_type_hrdwtso(tp, bbr, len, 4, what_we_can); + } else if ((ctf_outstanding(tp) + bbr->r_ctl.rc_pace_max_segs) > tp->snd_wnd) { + BBR_STAT_INC(bbr_miss_tso_rwnd); + bbr_log_type_hrdwtso(tp, bbr, len, 5, what_we_can); + } else { + BBR_STAT_INC(bbr_miss_unknown); + bbr_log_type_hrdwtso(tp, bbr, len, 6, what_we_can); + } + } + } + /* Do accounting for new sends */ + if ((len > 0) && (rsm == NULL)) { + int idx; + if (tp->snd_una == tp->snd_max) { + /* + * Special case to match google, when + * nothing is in flight the delivered + * time does get updated to the current + * time (see tcp_rate_bsd.c). + */ + bbr->r_ctl.rc_del_time = cts; + } + if (len >= maxseg) { + idx = (len / maxseg) + 3; + if (idx >= TCP_MSS_ACCT_ATIMER) + counter_u64_add(bbr_out_size[(TCP_MSS_ACCT_ATIMER - 1)], 1); + else + counter_u64_add(bbr_out_size[idx], 1); + } else { + /* smaller than a MSS */ + idx = len / (bbr_hptsi_bytes_min - bbr->rc_last_options); + if (idx >= TCP_MSS_SMALL_MAX_SIZE_DIV) + idx = (TCP_MSS_SMALL_MAX_SIZE_DIV - 1); + counter_u64_add(bbr_out_size[(idx + TCP_MSS_SMALL_SIZE_OFF)], 1); + } + } + } + abandon = 0; + /* + * We must do the send accounting before we log the output, + * otherwise the state of the rsm could change and we account to the + * wrong bucket. + */ + if (len > 0) { + bbr_do_send_accounting(tp, bbr, rsm, len, error); + if (error == 0) { + if (tp->snd_una == tp->snd_max) + bbr->r_ctl.rc_tlp_rxt_last_time = cts; + } + } + bbr_log_output(bbr, tp, &to, len, bbr_seq, (uint8_t) flags, error, + cts, mb, &abandon, rsm, 0, sb); + if (abandon) { + /* + * If bbr_log_output destroys the TCB or sees a TH_RST being + * sent we should hit this condition. + */ + return (0); + } + if (((tp->t_flags & TF_FORCEDATA) == 0) || + (bbr->rc_in_persist == 0)) { + /* + * Advance snd_nxt over sequence space of this segment. + */ + if (error) + /* We don't log or do anything with errors */ + goto skip_upd; + + if (tp->snd_una == tp->snd_max && + (len || (flags & (TH_SYN | TH_FIN)))) { + /* + * Update the time we just added data since none was + * outstanding. + */ + bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__); + bbr->rc_tp->t_acktime = ticks; + } + if (flags & (TH_SYN | TH_FIN) && (rsm == NULL)) { + if (flags & TH_SYN) { + tp->snd_max++; + } + if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) { + tp->snd_max++; + tp->t_flags |= TF_SENTFIN; + } + } + if (sack_rxmit == 0) + tp->snd_max += len; +skip_upd: + if ((error == 0) && len) + tot_len += len; + } else { + /* Persists case */ + int32_t xlen = len; + + if (error) + goto nomore; + + if (flags & TH_SYN) + ++xlen; + if ((flags & TH_FIN) && ((tp->t_flags & TF_SENTFIN) == 0)) { + ++xlen; + tp->t_flags |= TF_SENTFIN; + } + if (xlen && (tp->snd_una == tp->snd_max)) { + /* + * Update the time we just added data since none was + * outstanding. + */ + bbr_log_progress_event(bbr, tp, ticks, PROGRESS_START, __LINE__); + bbr->rc_tp->t_acktime = ticks; + } + if (sack_rxmit == 0) + tp->snd_max += xlen; + tot_len += (len + optlen + ipoptlen); + } +nomore: + if (error) { + /* + * Failures do not advance the seq counter above. For the + * case of ENOBUFS we will fall out and become ack-clocked. + * capping the cwnd at the current flight. + * Everything else will just have to retransmit with the timer + * (no pacer). + */ + SOCKBUF_UNLOCK_ASSERT(sb); + BBR_STAT_INC(bbr_saw_oerr); + /* Clear all delay/early tracks */ + bbr->r_ctl.rc_hptsi_agg_delay = 0; + bbr->r_ctl.rc_agg_early = 0; + bbr->r_agg_early_set = 0; + bbr->output_error_seen = 1; + if (bbr->oerror_cnt < 0xf) + bbr->oerror_cnt++; + if (bbr_max_net_error_cnt && (bbr->oerror_cnt >= bbr_max_net_error_cnt)) { + /* drop the session */ + tcp_set_inp_to_drop(inp, ENETDOWN); + } + switch (error) { + case ENOBUFS: + /* + * Make this guy have to get ack's to send + * more but lets make sure we don't + * slam him below a T-O (1MSS). + */ + if (bbr->rc_bbr_state != BBR_STATE_PROBE_RTT) { + tp->snd_cwnd = ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes)) - maxseg; + if (tp->snd_cwnd < maxseg) + tp->snd_cwnd = maxseg; + } + slot = (bbr_error_base_paceout + 1) << bbr->oerror_cnt; + BBR_STAT_INC(bbr_saw_enobuf); + if (bbr->bbr_hdrw_pacing) + counter_u64_add(bbr_hdwr_pacing_enobuf, 1); + else + counter_u64_add(bbr_nohdwr_pacing_enobuf, 1); + /* + * Here even in the enobuf's case we want to do our + * state update. The reason being we may have been + * called by the input function. If so we have had + * things change. + */ + error = 0; + goto enobufs; + case EMSGSIZE: + /* + * For some reason the interface we used initially + * to send segments changed to another or lowered + * its MTU. If TSO was active we either got an + * interface without TSO capabilits or TSO was + * turned off. If we obtained mtu from ip_output() + * then update it and try again. + */ + /* Turn on tracing (or try to) */ + { + int old_maxseg; + + old_maxseg = tp->t_maxseg; + BBR_STAT_INC(bbr_saw_emsgsiz); + bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, csum_flags, tso, cts); + if (mtu != 0) + tcp_mss_update(tp, -1, mtu, NULL, NULL); + if (old_maxseg <= tp->t_maxseg) { + /* Huh it did not shrink? */ + tp->t_maxseg = old_maxseg - 40; + bbr_log_msgsize_fail(bbr, tp, len, maxseg, mtu, 0, tso, cts); + } + tp->t_flags &= ~TF_FORCEDATA; + /* + * Nuke all other things that can interfere + * with slot + */ + if ((tot_len + len) && (len >= tp->t_maxseg)) { + slot = bbr_get_pacing_delay(bbr, + bbr->r_ctl.rc_bbr_hptsi_gain, + (tot_len + len), cts, 0); + if (slot < bbr_error_base_paceout) + slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt; + } else + slot = (bbr_error_base_paceout + 2) << bbr->oerror_cnt; + bbr->rc_output_starts_timer = 1; + bbr_start_hpts_timer(bbr, tp, cts, 10, slot, + tot_len); + return (error); + } + case EPERM: + tp->t_softerror = error; + /* Fall through */ + case EHOSTDOWN: + case EHOSTUNREACH: + case ENETDOWN: + case ENETUNREACH: + if (TCPS_HAVERCVDSYN(tp->t_state)) { + tp->t_softerror = error; + } + /* FALLTHROUGH */ + default: + tp->t_flags &= ~TF_FORCEDATA; + slot = (bbr_error_base_paceout + 3) << bbr->oerror_cnt; + bbr->rc_output_starts_timer = 1; + bbr_start_hpts_timer(bbr, tp, cts, 11, slot, 0); + return (error); + } +#ifdef NETFLIX_STATS + } else if (((tp->t_flags & TF_GPUTINPROG) == 0) && + len && + (rsm == NULL) && + (bbr->rc_in_persist == 0)) { + tp->gput_seq = bbr_seq; + tp->gput_ack = bbr_seq + + min(sbavail(&so->so_snd) - sb_offset, sendwin); + tp->gput_ts = cts; + tp->t_flags |= TF_GPUTINPROG; +#endif + } + TCPSTAT_INC(tcps_sndtotal); + if ((bbr->bbr_hdw_pace_ena) && + (bbr->bbr_attempt_hdwr_pace == 0) && + (bbr->rc_past_init_win) && + (bbr->rc_bbr_state != BBR_STATE_STARTUP) && + (get_filter_value(&bbr->r_ctl.rc_delrate)) && + (inp->inp_route.ro_rt && + inp->inp_route.ro_rt->rt_ifp)) { + /* + * We are past the initial window and + * have at least one measurement so we + * could use hardware pacing if its available. + * We have an interface and we have not attempted + * to setup hardware pacing, lets try to now. + */ + uint64_t rate_wanted; + int err = 0; + + rate_wanted = bbr_get_hardware_rate(bbr); + bbr->bbr_attempt_hdwr_pace = 1; + bbr->r_ctl.crte = tcp_set_pacing_rate(bbr->rc_tp, + inp->inp_route.ro_rt->rt_ifp, + rate_wanted, + (RS_PACING_GEQ|RS_PACING_SUB_OK), + &err); + if (bbr->r_ctl.crte) { + bbr_type_log_hdwr_pacing(bbr, + bbr->r_ctl.crte->ptbl->rs_ifp, + rate_wanted, + bbr->r_ctl.crte->rate, + __LINE__, cts, err); + BBR_STAT_INC(bbr_hdwr_rl_add_ok); + counter_u64_add(bbr_flows_nohdwr_pacing, -1); + counter_u64_add(bbr_flows_whdwr_pacing, 1); + bbr->bbr_hdrw_pacing = 1; + /* Now what is our gain status? */ + if (bbr->r_ctl.crte->rate < rate_wanted) { + /* We have a problem */ + bbr_setup_less_of_rate(bbr, cts, + bbr->r_ctl.crte->rate, rate_wanted); + } else { + /* We are good */ + bbr->gain_is_limited = 0; + bbr->skip_gain = 0; + } + tcp_bbr_tso_size_check(bbr, cts); + } else { + bbr_type_log_hdwr_pacing(bbr, + inp->inp_route.ro_rt->rt_ifp, + rate_wanted, + 0, + __LINE__, cts, err); + BBR_STAT_INC(bbr_hdwr_rl_add_fail); + } + } + if (bbr->bbr_hdrw_pacing) { + /* + * Worry about cases where the route + * changes or something happened that we + * lost our hardware pacing possibly during + * the last ip_output call. + */ + if (inp->inp_snd_tag == NULL) { + /* A change during ip output disabled hw pacing? */ + bbr->bbr_hdrw_pacing = 0; + } else if ((inp->inp_route.ro_rt == NULL) || + (inp->inp_route.ro_rt->rt_ifp != inp->inp_snd_tag->ifp)) { + /* + * We had an interface or route change, + * detach from the current hdwr pacing + * and setup to re-attempt next go + * round. + */ + bbr->bbr_hdrw_pacing = 0; + bbr->bbr_attempt_hdwr_pace = 0; + tcp_rel_pacing_rate(bbr->r_ctl.crte, bbr->rc_tp); + tcp_bbr_tso_size_check(bbr, cts); + } + } + /* + * Data sent (as far as we can tell). If this advertises a larger + * window than any other segment, then remember the size of the + * advertised window. Any pending ACK has now been sent. + */ + if (SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv)) + tp->rcv_adv = tp->rcv_nxt + recwin; + + tp->last_ack_sent = tp->rcv_nxt; + if ((error == 0) && + (bbr->r_ctl.rc_pace_max_segs > tp->t_maxseg) && + (doing_tlp == 0) && + (tso == 0) && + (hw_tls == 0) && + (len > 0) && + ((flags & TH_RST) == 0) && + (IN_RECOVERY(tp->t_flags) == 0) && + (bbr->rc_in_persist == 0) && + ((tp->t_flags & TF_FORCEDATA) == 0) && + (tot_len < bbr->r_ctl.rc_pace_max_segs)) { + /* + * For non-tso we need to goto again until we have sent out + * enough data to match what we are hptsi out every hptsi + * interval. + */ + if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { + /* Make sure snd_nxt is drug up */ + tp->snd_nxt = tp->snd_max; + } + if (rsm != NULL) { + rsm = NULL; + goto skip_again; + } + rsm = NULL; + sack_rxmit = 0; + tp->t_flags &= ~(TF_ACKNOW | TF_DELACK | TF_FORCEDATA); + goto again; + } +skip_again: + if (((flags & (TH_RST | TH_SYN | TH_FIN)) == 0) && tot_len) { + /* + * Calculate/Re-Calculate the hptsi slot in usecs based on + * what we have sent so far + */ + slot = bbr_get_pacing_delay(bbr, bbr->r_ctl.rc_bbr_hptsi_gain, tot_len, cts, 0); + if (bbr->rc_no_pacing) + slot = 0; + } + tp->t_flags &= ~(TF_ACKNOW | TF_DELACK | TF_FORCEDATA); +enobufs: + if (bbr->rc_use_google == 0) + bbr_check_bbr_for_state(bbr, cts, __LINE__, 0); + bbr_cwnd_limiting(tp, bbr, ctf_flight_size(tp, (bbr->r_ctl.rc_sacked + + bbr->r_ctl.rc_lost_bytes))); + bbr->rc_output_starts_timer = 1; + if (bbr->bbr_use_rack_cheat && + (more_to_rxt || + ((bbr->r_ctl.rc_resend = bbr_check_recovery_mode(tp, bbr, cts)) != NULL))) { + /* Rack cheats and shotguns out all rxt's 1ms apart */ + if (slot > 1000) + slot = 1000; + } + if (bbr->bbr_hdrw_pacing && (bbr->hw_pacing_set == 0)) { + /* + * We don't change the tso size until some number of sends + * to give the hardware commands time to get down + * to the interface. + */ + bbr->r_ctl.bbr_hdwr_cnt_noset_snt++; + if (bbr->r_ctl.bbr_hdwr_cnt_noset_snt >= bbr_hdwr_pacing_delay_cnt) { + bbr->hw_pacing_set = 1; + tcp_bbr_tso_size_check(bbr, cts); + } + } + bbr_start_hpts_timer(bbr, tp, cts, 12, slot, tot_len); + if (SEQ_LT(tp->snd_nxt, tp->snd_max)) { + /* Make sure snd_nxt is drug up */ + tp->snd_nxt = tp->snd_max; + } + return (error); + +} + +/* + * See bbr_output_wtime() for return values. + */ +static int +bbr_output(struct tcpcb *tp) +{ + int32_t ret; + struct timeval tv; + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + INP_WLOCK_ASSERT(tp->t_inpcb); + (void)tcp_get_usecs(&tv); + ret = bbr_output_wtime(tp, &tv); + return (ret); +} + +static void +bbr_mtu_chg(struct tcpcb *tp) +{ + struct tcp_bbr *bbr; + struct bbr_sendmap *rsm, *frsm = NULL; + uint32_t maxseg; + + /* + * The MTU has changed. a) Clear the sack filter. b) Mark everything + * over the current size as SACK_PASS so a retransmit will occur. + */ + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + maxseg = tp->t_maxseg - bbr->rc_last_options; + sack_filter_clear(&bbr->r_ctl.bbr_sf, tp->snd_una); + TAILQ_FOREACH(rsm, &bbr->r_ctl.rc_map, r_next) { + /* Don't mess with ones acked (by sack?) */ + if (rsm->r_flags & BBR_ACKED) + continue; + if ((rsm->r_end - rsm->r_start) > maxseg) { + /* + * We mark sack-passed on all the previous large + * sends we did. This will force them to retransmit. + */ + rsm->r_flags |= BBR_SACK_PASSED; + if (((rsm->r_flags & BBR_MARKED_LOST) == 0) && + bbr_is_lost(bbr, rsm, bbr->r_ctl.rc_rcvtime)) { + bbr->r_ctl.rc_lost_bytes += rsm->r_end - rsm->r_start; + bbr->r_ctl.rc_lost += rsm->r_end - rsm->r_start; + rsm->r_flags |= BBR_MARKED_LOST; + } + if (frsm == NULL) + frsm = rsm; + } + } + if (frsm) { + bbr->r_ctl.rc_resend = frsm; + } +} + +/* + * bbr_ctloutput() must drop the inpcb lock before performing copyin on + * socket option arguments. When it re-acquires the lock after the copy, it + * has to revalidate that the connection is still valid for the socket + * option. + */ +static int +bbr_set_sockopt(struct socket *so, struct sockopt *sopt, + struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr) +{ + int32_t error = 0, optval; + + switch (sopt->sopt_name) { + case TCP_RACK_PACE_MAX_SEG: + case TCP_RACK_MIN_TO: + case TCP_RACK_REORD_THRESH: + case TCP_RACK_REORD_FADE: + case TCP_RACK_TLP_THRESH: + case TCP_RACK_PKT_DELAY: + case TCP_BBR_ALGORITHM: + case TCP_BBR_TSLIMITS: + case TCP_BBR_IWINTSO: + case TCP_BBR_RECFORCE: + case TCP_BBR_STARTUP_PG: + case TCP_BBR_DRAIN_PG: + case TCP_BBR_RWND_IS_APP: + case TCP_BBR_PROBE_RTT_INT: + case TCP_BBR_PROBE_RTT_GAIN: + case TCP_BBR_PROBE_RTT_LEN: + case TCP_BBR_STARTUP_LOSS_EXIT: + case TCP_BBR_USEDEL_RATE: + case TCP_BBR_MIN_RTO: + case TCP_BBR_MAX_RTO: + case TCP_BBR_PACE_PER_SEC: + case TCP_DELACK: + case TCP_BBR_PACE_DEL_TAR: + case TCP_BBR_SEND_IWND_IN_TSO: + case TCP_BBR_EXTRA_STATE: + case TCP_BBR_UTTER_MAX_TSO: + case TCP_BBR_MIN_TOPACEOUT: + case TCP_BBR_FLOOR_MIN_TSO: + case TCP_BBR_TSTMP_RAISES: + case TCP_BBR_POLICER_DETECT: + case TCP_BBR_USE_RACK_CHEAT: + case TCP_DATA_AFTER_CLOSE: + case TCP_BBR_HDWR_PACE: + case TCP_BBR_PACE_SEG_MAX: + case TCP_BBR_PACE_SEG_MIN: + case TCP_BBR_PACE_CROSS: + case TCP_BBR_PACE_OH: +#ifdef NETFLIX_PEAKRATE + case TCP_MAXPEAKRATE: +#endif + case TCP_BBR_TMR_PACE_OH: + case TCP_BBR_RACK_RTT_USE: + case TCP_BBR_RETRAN_WTSO: + break; + default: + return (tcp_default_ctloutput(so, sopt, inp, tp)); + break; + } + INP_WUNLOCK(inp); + error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); + if (error) + return (error); + INP_WLOCK(inp); + if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { + INP_WUNLOCK(inp); + return (ECONNRESET); + } + tp = intotcpcb(inp); + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + switch (sopt->sopt_name) { + case TCP_BBR_PACE_PER_SEC: + BBR_OPTS_INC(tcp_bbr_pace_per_sec); + bbr->r_ctl.bbr_hptsi_per_second = optval; + break; + case TCP_BBR_PACE_DEL_TAR: + BBR_OPTS_INC(tcp_bbr_pace_del_tar); + bbr->r_ctl.bbr_hptsi_segments_delay_tar = optval; + break; + case TCP_BBR_PACE_SEG_MAX: + BBR_OPTS_INC(tcp_bbr_pace_seg_max); + bbr->r_ctl.bbr_hptsi_segments_max = optval; + break; + case TCP_BBR_PACE_SEG_MIN: + BBR_OPTS_INC(tcp_bbr_pace_seg_min); + bbr->r_ctl.bbr_hptsi_bytes_min = optval; + break; + case TCP_BBR_PACE_CROSS: + BBR_OPTS_INC(tcp_bbr_pace_cross); + bbr->r_ctl.bbr_cross_over = optval; + break; + case TCP_BBR_ALGORITHM: + BBR_OPTS_INC(tcp_bbr_algorithm); + if (optval && (bbr->rc_use_google == 0)) { + /* Turn on the google mode */ + bbr_google_mode_on(bbr); + if ((optval > 3) && (optval < 500)) { + /* + * Must be at least greater than .3% + * and must be less than 50.0%. + */ + bbr->r_ctl.bbr_google_discount = optval; + } + } else if ((optval == 0) && (bbr->rc_use_google == 1)) { + /* Turn off the google mode */ + bbr_google_mode_off(bbr); + } + break; + case TCP_BBR_TSLIMITS: + BBR_OPTS_INC(tcp_bbr_tslimits); + if (optval == 1) + bbr->rc_use_ts_limit = 1; + else if (optval == 0) + bbr->rc_use_ts_limit = 0; + else + error = EINVAL; + break; + + case TCP_BBR_IWINTSO: + BBR_OPTS_INC(tcp_bbr_iwintso); + if ((optval >= 0) && (optval < 128)) { + uint32_t twin; + + bbr->rc_init_win = optval; + twin = bbr_initial_cwnd(bbr, tp); + if ((bbr->rc_past_init_win == 0) && (twin > tp->snd_cwnd)) + tp->snd_cwnd = twin; + else + error = EBUSY; + } else + error = EINVAL; + break; + case TCP_BBR_STARTUP_PG: + BBR_OPTS_INC(tcp_bbr_startup_pg); + if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) { + bbr->r_ctl.rc_startup_pg = optval; + if (bbr->rc_bbr_state == BBR_STATE_STARTUP) { + bbr->r_ctl.rc_bbr_hptsi_gain = optval; + } + } else + error = EINVAL; + break; + case TCP_BBR_DRAIN_PG: + BBR_OPTS_INC(tcp_bbr_drain_pg); + if ((optval > 0) && (optval < BBR_MAX_GAIN_VALUE)) + bbr->r_ctl.rc_drain_pg = optval; + else + error = EINVAL; + break; + case TCP_BBR_PROBE_RTT_LEN: + BBR_OPTS_INC(tcp_bbr_probertt_len); + if (optval <= 1) + reset_time_small(&bbr->r_ctl.rc_rttprop, (optval * USECS_IN_SECOND)); + else + error = EINVAL; + break; + case TCP_BBR_PROBE_RTT_GAIN: + BBR_OPTS_INC(tcp_bbr_probertt_gain); + if (optval <= BBR_UNIT) + bbr->r_ctl.bbr_rttprobe_gain_val = optval; + else + error = EINVAL; + break; + case TCP_BBR_PROBE_RTT_INT: + BBR_OPTS_INC(tcp_bbr_probe_rtt_int); + if (optval > 1000) + bbr->r_ctl.rc_probertt_int = optval; + else + error = EINVAL; + break; + case TCP_BBR_MIN_TOPACEOUT: + BBR_OPTS_INC(tcp_bbr_topaceout); + if (optval == 0) { + bbr->no_pacing_until = 0; + bbr->rc_no_pacing = 0; + } else if (optval <= 0x00ff) { + bbr->no_pacing_until = optval; + if ((bbr->r_ctl.rc_pkt_epoch < bbr->no_pacing_until) && + (bbr->rc_bbr_state == BBR_STATE_STARTUP)){ + /* Turn on no pacing */ + bbr->rc_no_pacing = 1; + } + } else + error = EINVAL; + break; + case TCP_BBR_STARTUP_LOSS_EXIT: + BBR_OPTS_INC(tcp_bbr_startup_loss_exit); + bbr->rc_loss_exit = optval; + break; + case TCP_BBR_USEDEL_RATE: + error = EINVAL; + break; + case TCP_BBR_MIN_RTO: + BBR_OPTS_INC(tcp_bbr_min_rto); + bbr->r_ctl.rc_min_rto_ms = optval; + break; + case TCP_BBR_MAX_RTO: + BBR_OPTS_INC(tcp_bbr_max_rto); + bbr->rc_max_rto_sec = optval; + break; + case TCP_RACK_MIN_TO: + /* Minimum time between rack t-o's in ms */ + BBR_OPTS_INC(tcp_rack_min_to); + bbr->r_ctl.rc_min_to = optval; + break; + case TCP_RACK_REORD_THRESH: + /* RACK reorder threshold (shift amount) */ + BBR_OPTS_INC(tcp_rack_reord_thresh); + if ((optval > 0) && (optval < 31)) + bbr->r_ctl.rc_reorder_shift = optval; + else + error = EINVAL; + break; + case TCP_RACK_REORD_FADE: + /* Does reordering fade after ms time */ + BBR_OPTS_INC(tcp_rack_reord_fade); + bbr->r_ctl.rc_reorder_fade = optval; + break; + case TCP_RACK_TLP_THRESH: + /* RACK TLP theshold i.e. srtt+(srtt/N) */ + BBR_OPTS_INC(tcp_rack_tlp_thresh); + if (optval) + bbr->rc_tlp_threshold = optval; + else + error = EINVAL; + break; + case TCP_BBR_USE_RACK_CHEAT: + BBR_OPTS_INC(tcp_use_rackcheat); + if (bbr->rc_use_google) { + error = EINVAL; + break; + } + BBR_OPTS_INC(tcp_rack_cheat); + if (optval) + bbr->bbr_use_rack_cheat = 1; + else + bbr->bbr_use_rack_cheat = 0; + break; + case TCP_BBR_FLOOR_MIN_TSO: + BBR_OPTS_INC(tcp_utter_max_tso); + if ((optval >= 0) && (optval < 40)) + bbr->r_ctl.bbr_hptsi_segments_floor = optval; + else + error = EINVAL; + break; + case TCP_BBR_UTTER_MAX_TSO: + BBR_OPTS_INC(tcp_utter_max_tso); + if ((optval >= 0) && (optval < 0xffff)) + bbr->r_ctl.bbr_utter_max = optval; + else + error = EINVAL; + break; + + case TCP_BBR_EXTRA_STATE: + BBR_OPTS_INC(tcp_extra_state); + if (optval) + bbr->rc_use_idle_restart = 1; + else + bbr->rc_use_idle_restart = 0; + break; + case TCP_BBR_SEND_IWND_IN_TSO: + BBR_OPTS_INC(tcp_iwnd_tso); + if (optval) { + bbr->bbr_init_win_cheat = 1; + if (bbr->rc_past_init_win == 0) { + uint32_t cts; + cts = tcp_get_usecs(&bbr->rc_tv); + tcp_bbr_tso_size_check(bbr, cts); + } + } else + bbr->bbr_init_win_cheat = 0; + break; + case TCP_BBR_HDWR_PACE: + BBR_OPTS_INC(tcp_hdwr_pacing); + if (optval){ + bbr->bbr_hdw_pace_ena = 1; + bbr->bbr_attempt_hdwr_pace = 0; + } else { + bbr->bbr_hdw_pace_ena = 0; + if (bbr->bbr_hdrw_pacing) { + bbr->bbr_hdrw_pacing = 0; + in_pcbdetach_txrtlmt(bbr->rc_inp); + } + } + break; + + case TCP_DELACK: + BBR_OPTS_INC(tcp_delack); + if (optval < 100) { + if (optval == 0) /* off */ + tp->t_delayed_ack = 0; + else if (optval == 1) /* on which is 2 */ + tp->t_delayed_ack = 2; + else /* higher than 2 and less than 100 */ + tp->t_delayed_ack = optval; + if (tp->t_flags & TF_DELACK) { + tp->t_flags &= ~TF_DELACK; + tp->t_flags |= TF_ACKNOW; + bbr_output(tp); + } + } else + error = EINVAL; + break; + case TCP_RACK_PKT_DELAY: + /* RACK added ms i.e. rack-rtt + reord + N */ + BBR_OPTS_INC(tcp_rack_pkt_delay); + bbr->r_ctl.rc_pkt_delay = optval; + break; +#ifdef NETFLIX_PEAKRATE + case TCP_MAXPEAKRATE: + BBR_OPTS_INC(tcp_maxpeak); + error = tcp_set_maxpeakrate(tp, optval); + if (!error) + tp->t_peakrate_thr = tp->t_maxpeakrate; + break; +#endif + case TCP_BBR_RETRAN_WTSO: + BBR_OPTS_INC(tcp_retran_wtso); + if (optval) + bbr->rc_resends_use_tso = 1; + else + bbr->rc_resends_use_tso = 0; + break; + case TCP_DATA_AFTER_CLOSE: + BBR_OPTS_INC(tcp_data_ac); + if (optval) + bbr->rc_allow_data_af_clo = 1; + else + bbr->rc_allow_data_af_clo = 0; + break; + case TCP_BBR_POLICER_DETECT: + BBR_OPTS_INC(tcp_policer_det); + if (bbr->rc_use_google == 0) + error = EINVAL; + else if (optval) + bbr->r_use_policer = 1; + else + bbr->r_use_policer = 0; + break; + + case TCP_BBR_TSTMP_RAISES: + BBR_OPTS_INC(tcp_ts_raises); + if (optval) + bbr->ts_can_raise = 1; + else + bbr->ts_can_raise = 0; + break; + case TCP_BBR_TMR_PACE_OH: + BBR_OPTS_INC(tcp_pacing_oh_tmr); + if (bbr->rc_use_google) { + error = EINVAL; + } else { + if (optval) + bbr->r_ctl.rc_incr_tmrs = 1; + else + bbr->r_ctl.rc_incr_tmrs = 0; + } + break; + case TCP_BBR_PACE_OH: + BBR_OPTS_INC(tcp_pacing_oh); + if (bbr->rc_use_google) { + error = EINVAL; + } else { + if (optval > (BBR_INCL_TCP_OH| + BBR_INCL_IP_OH| + BBR_INCL_ENET_OH)) { + error = EINVAL; + break; + } + if (optval & BBR_INCL_TCP_OH) + bbr->r_ctl.rc_inc_tcp_oh = 1; + else + bbr->r_ctl.rc_inc_tcp_oh = 0; + if (optval & BBR_INCL_IP_OH) + bbr->r_ctl.rc_inc_ip_oh = 1; + else + bbr->r_ctl.rc_inc_ip_oh = 0; + if (optval & BBR_INCL_ENET_OH) + bbr->r_ctl.rc_inc_enet_oh = 1; + else + bbr->r_ctl.rc_inc_enet_oh = 0; + } + break; + default: + return (tcp_default_ctloutput(so, sopt, inp, tp)); + break; + } +#ifdef NETFLIX_STATS + tcp_log_socket_option(tp, sopt->sopt_name, optval, error); +#endif + INP_WUNLOCK(inp); + return (error); +} + +/* + * return 0 on success, error-num on failure + */ +static int +bbr_get_sockopt(struct socket *so, struct sockopt *sopt, + struct inpcb *inp, struct tcpcb *tp, struct tcp_bbr *bbr) +{ + int32_t error, optval; + + /* + * Because all our options are either boolean or an int, we can just + * pull everything into optval and then unlock and copy. If we ever + * add a option that is not a int, then this will have quite an + * impact to this routine. + */ + switch (sopt->sopt_name) { + case TCP_BBR_PACE_PER_SEC: + optval = bbr->r_ctl.bbr_hptsi_per_second; + break; + case TCP_BBR_PACE_DEL_TAR: + optval = bbr->r_ctl.bbr_hptsi_segments_delay_tar; + break; + case TCP_BBR_PACE_SEG_MAX: + optval = bbr->r_ctl.bbr_hptsi_segments_max; + break; + case TCP_BBR_MIN_TOPACEOUT: + optval = bbr->no_pacing_until; + break; + case TCP_BBR_PACE_SEG_MIN: + optval = bbr->r_ctl.bbr_hptsi_bytes_min; + break; + case TCP_BBR_PACE_CROSS: + optval = bbr->r_ctl.bbr_cross_over; + break; + case TCP_BBR_ALGORITHM: + optval = bbr->rc_use_google; + break; + case TCP_BBR_TSLIMITS: + optval = bbr->rc_use_ts_limit; + break; + case TCP_BBR_IWINTSO: + optval = bbr->rc_init_win; + break; + case TCP_BBR_STARTUP_PG: + optval = bbr->r_ctl.rc_startup_pg; + break; + case TCP_BBR_DRAIN_PG: + optval = bbr->r_ctl.rc_drain_pg; + break; + case TCP_BBR_PROBE_RTT_INT: + optval = bbr->r_ctl.rc_probertt_int; + break; + case TCP_BBR_PROBE_RTT_LEN: + optval = (bbr->r_ctl.rc_rttprop.cur_time_limit / USECS_IN_SECOND); + break; + case TCP_BBR_PROBE_RTT_GAIN: + optval = bbr->r_ctl.bbr_rttprobe_gain_val; + break; + case TCP_BBR_STARTUP_LOSS_EXIT: + optval = bbr->rc_loss_exit; + break; + case TCP_BBR_USEDEL_RATE: + error = EINVAL; + break; + case TCP_BBR_MIN_RTO: + optval = bbr->r_ctl.rc_min_rto_ms; + break; + case TCP_BBR_MAX_RTO: + optval = bbr->rc_max_rto_sec; + break; + case TCP_RACK_PACE_MAX_SEG: + /* Max segments in a pace */ + optval = bbr->r_ctl.rc_pace_max_segs; + break; + case TCP_RACK_MIN_TO: + /* Minimum time between rack t-o's in ms */ + optval = bbr->r_ctl.rc_min_to; + break; + case TCP_RACK_REORD_THRESH: + /* RACK reorder threshold (shift amount) */ + optval = bbr->r_ctl.rc_reorder_shift; + break; + case TCP_RACK_REORD_FADE: + /* Does reordering fade after ms time */ + optval = bbr->r_ctl.rc_reorder_fade; + break; + case TCP_BBR_USE_RACK_CHEAT: + /* Do we use the rack cheat for rxt */ + optval = bbr->bbr_use_rack_cheat; + break; + case TCP_BBR_FLOOR_MIN_TSO: + optval = bbr->r_ctl.bbr_hptsi_segments_floor; + break; + case TCP_BBR_UTTER_MAX_TSO: + optval = bbr->r_ctl.bbr_utter_max; + break; + case TCP_BBR_SEND_IWND_IN_TSO: + /* Do we send TSO size segments initially */ + optval = bbr->bbr_init_win_cheat; + break; + case TCP_BBR_EXTRA_STATE: + optval = bbr->rc_use_idle_restart; + break; + case TCP_RACK_TLP_THRESH: + /* RACK TLP theshold i.e. srtt+(srtt/N) */ + optval = bbr->rc_tlp_threshold; + break; + case TCP_RACK_PKT_DELAY: + /* RACK added ms i.e. rack-rtt + reord + N */ + optval = bbr->r_ctl.rc_pkt_delay; + break; + case TCP_BBR_RETRAN_WTSO: + optval = bbr->rc_resends_use_tso; + break; + case TCP_DATA_AFTER_CLOSE: + optval = bbr->rc_allow_data_af_clo; + break; + case TCP_DELACK: + optval = tp->t_delayed_ack; + break; + case TCP_BBR_HDWR_PACE: + optval = bbr->bbr_hdw_pace_ena; + break; + case TCP_BBR_POLICER_DETECT: + optval = bbr->r_use_policer; + break; + case TCP_BBR_TSTMP_RAISES: + optval = bbr->ts_can_raise; + break; + case TCP_BBR_TMR_PACE_OH: + optval = bbr->r_ctl.rc_incr_tmrs; + break; + case TCP_BBR_PACE_OH: + optval = 0; + if (bbr->r_ctl.rc_inc_tcp_oh) + optval |= BBR_INCL_TCP_OH; + if (bbr->r_ctl.rc_inc_ip_oh) + optval |= BBR_INCL_IP_OH; + if (bbr->r_ctl.rc_inc_enet_oh) + optval |= BBR_INCL_ENET_OH; + break; + default: + return (tcp_default_ctloutput(so, sopt, inp, tp)); + break; + } + INP_WUNLOCK(inp); + error = sooptcopyout(sopt, &optval, sizeof optval); + return (error); +} + +/* + * return 0 on success, error-num on failure + */ +static int +bbr_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) +{ + int32_t error = EINVAL; + struct tcp_bbr *bbr; + + bbr = (struct tcp_bbr *)tp->t_fb_ptr; + if (bbr == NULL) { + /* Huh? */ + goto out; + } + if (sopt->sopt_dir == SOPT_SET) { + return (bbr_set_sockopt(so, sopt, inp, tp, bbr)); + } else if (sopt->sopt_dir == SOPT_GET) { + return (bbr_get_sockopt(so, sopt, inp, tp, bbr)); + } +out: + INP_WUNLOCK(inp); + return (error); +} + + +struct tcp_function_block __tcp_bbr = { + .tfb_tcp_block_name = __XSTRING(STACKNAME), + .tfb_tcp_output = bbr_output, + .tfb_do_queued_segments = ctf_do_queued_segments, + .tfb_do_segment_nounlock = bbr_do_segment_nounlock, + .tfb_tcp_do_segment = bbr_do_segment, + .tfb_tcp_ctloutput = bbr_ctloutput, + .tfb_tcp_fb_init = bbr_init, + .tfb_tcp_fb_fini = bbr_fini, + .tfb_tcp_timer_stop_all = bbr_stopall, + .tfb_tcp_timer_activate = bbr_timer_activate, + .tfb_tcp_timer_active = bbr_timer_active, + .tfb_tcp_timer_stop = bbr_timer_stop, + .tfb_tcp_rexmit_tmr = bbr_remxt_tmr, + .tfb_tcp_handoff_ok = bbr_handoff_ok, + .tfb_tcp_mtu_chg = bbr_mtu_chg +}; + +static const char *bbr_stack_names[] = { + __XSTRING(STACKNAME), +#ifdef STACKALIAS + __XSTRING(STACKALIAS), +#endif +}; + +static bool bbr_mod_inited = false; + +static int +tcp_addbbr(module_t mod, int32_t type, void *data) +{ + int32_t err = 0; + int num_stacks; + + switch (type) { + case MOD_LOAD: + printf("Attempting to load " __XSTRING(MODNAME) "\n"); + bbr_zone = uma_zcreate(__XSTRING(MODNAME) "_map", + sizeof(struct bbr_sendmap), + NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); + bbr_pcb_zone = uma_zcreate(__XSTRING(MODNAME) "_pcb", + sizeof(struct tcp_bbr), + NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0); + sysctl_ctx_init(&bbr_sysctl_ctx); + bbr_sysctl_root = SYSCTL_ADD_NODE(&bbr_sysctl_ctx, + SYSCTL_STATIC_CHILDREN(_net_inet_tcp), + OID_AUTO, +#ifdef STACKALIAS + __XSTRING(STACKALIAS), +#else + __XSTRING(STACKNAME), +#endif + CTLFLAG_RW, 0, + ""); + if (bbr_sysctl_root == NULL) { + printf("Failed to add sysctl node\n"); + err = EFAULT; + goto free_uma; + } + bbr_init_sysctls(); + num_stacks = nitems(bbr_stack_names); + err = register_tcp_functions_as_names(&__tcp_bbr, M_WAITOK, + bbr_stack_names, &num_stacks); + if (err) { + printf("Failed to register %s stack name for " + "%s module\n", bbr_stack_names[num_stacks], + __XSTRING(MODNAME)); + sysctl_ctx_free(&bbr_sysctl_ctx); + free_uma: + uma_zdestroy(bbr_zone); + uma_zdestroy(bbr_pcb_zone); + bbr_counter_destroy(); + printf("Failed to register " __XSTRING(MODNAME) + " module err:%d\n", err); + return (err); + } + tcp_lro_reg_mbufq(); + bbr_mod_inited = true; + printf(__XSTRING(MODNAME) " is now available\n"); + break; + case MOD_QUIESCE: + err = deregister_tcp_functions(&__tcp_bbr, true, false); + break; + case MOD_UNLOAD: + err = deregister_tcp_functions(&__tcp_bbr, false, true); + if (err == EBUSY) + break; + if (bbr_mod_inited) { + uma_zdestroy(bbr_zone); + uma_zdestroy(bbr_pcb_zone); + sysctl_ctx_free(&bbr_sysctl_ctx); + bbr_counter_destroy(); + printf(__XSTRING(MODNAME) + " is now no longer available\n"); + bbr_mod_inited = false; + } + tcp_lro_dereg_mbufq(); + err = 0; + break; + default: + return (EOPNOTSUPP); + } + return (err); +} + +static moduledata_t tcp_bbr = { + .name = __XSTRING(MODNAME), + .evhand = tcp_addbbr, + .priv = 0 +}; + +MODULE_VERSION(MODNAME, 1); +DECLARE_MODULE(MODNAME, tcp_bbr, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); +MODULE_DEPEND(MODNAME, tcphpts, 1, 1, 1); diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c index 7ef1f3cc7832..f4a17e4dfc4b 100644 --- a/sys/netinet/tcp_stacks/rack.c +++ b/sys/netinet/tcp_stacks/rack.c @@ -1,6 +1,5 @@ /*- - * Copyright (c) 2016-2019 - * Netflix Inc. All rights reserved. + * Copyright (c) 2016-2019 Netflix, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -32,7 +31,8 @@ __FBSDID("$FreeBSD$"); #include "opt_inet6.h" #include "opt_ipsec.h" #include "opt_tcpdebug.h" - +#include "opt_ratelimit.h" +#include "opt_kern_tls.h" #include <sys/param.h> #include <sys/module.h> #include <sys/kernel.h> @@ -45,18 +45,20 @@ __FBSDID("$FreeBSD$"); #include <sys/mutex.h> #include <sys/mbuf.h> #include <sys/proc.h> /* for proc0 declaration */ -#ifdef NETFLIX_STATS -#include <sys/qmath.h> -#endif #include <sys/socket.h> #include <sys/socketvar.h> +#ifdef KERN_TLS +#include <sys/ktls.h> +#endif #include <sys/sysctl.h> #include <sys/systm.h> -#include <sys/tree.h> #ifdef NETFLIX_STATS +#include <sys/qmath.h> +#include <sys/tree.h> #include <sys/stats.h> /* Must come after qmath.h and tree.h */ #endif #include <sys/refcount.h> +#include <sys/tree.h> #include <sys/queue.h> #include <sys/smp.h> #include <sys/kthread.h> @@ -79,8 +81,8 @@ __FBSDID("$FreeBSD$"); #include <netinet/ip6.h> #include <netinet6/in6_pcb.h> #include <netinet6/ip6_var.h> -#define TCPOUTFLAGS #include <netinet/tcp.h> +#define TCPOUTFLAGS #include <netinet/tcp_fsm.h> #include <netinet/tcp_log_buf.h> #include <netinet/tcp_seq.h> @@ -90,6 +92,7 @@ __FBSDID("$FreeBSD$"); #include <netinet/tcpip.h> #include <netinet/cc/cc.h> #include <netinet/tcp_fastopen.h> +#include <netinet/tcp_lro.h> #ifdef TCPDEBUG #include <netinet/tcp_debug.h> #endif /* TCPDEBUG */ @@ -163,25 +166,41 @@ struct sysctl_oid *rack_sysctl_root; * must maintain the new rack scoreboard. * */ -static int32_t rack_precache = 1; static int32_t rack_tlp_thresh = 1; static int32_t rack_reorder_thresh = 2; static int32_t rack_reorder_fade = 60000; /* 0 - never fade, def 60,000 * - 60 seconds */ +/* Attack threshold detections */ +static uint32_t rack_highest_sack_thresh_seen = 0; +static uint32_t rack_highest_move_thresh_seen = 0; + static int32_t rack_pkt_delay = 1; -static int32_t rack_inc_var = 0;/* For TLP */ -static int32_t rack_reduce_largest_on_idle = 0; static int32_t rack_min_pace_time = 0; -static int32_t rack_min_pace_time_seg_req=6; static int32_t rack_early_recovery = 1; -static int32_t rack_early_recovery_max_seg = 6; static int32_t rack_send_a_lot_in_prr = 1; static int32_t rack_min_to = 1; /* Number of ms minimum timeout */ -static int32_t rack_tlp_in_recovery = 1; /* Can we do TLP in recovery? */ static int32_t rack_verbose_logging = 0; static int32_t rack_ignore_data_after_close = 1; -static int32_t rack_map_entries_limit = 1024; -static int32_t rack_map_split_limit = 256; +static int32_t use_rack_cheat = 1; +static int32_t rack_persist_min = 250; /* 250ms */ +static int32_t rack_persist_max = 1000; /* 1 Second */ +static int32_t rack_sack_not_required = 0; /* set to one to allow non-sack to use rack */ +static int32_t rack_hw_tls_max_seg = 0; /* 0 means use hw-tls single segment */ + +/* Sack attack detection thresholds and such */ +static int32_t tcp_force_detection = 0; + +#ifdef NETFLIX_EXP_DETECTION +static int32_t tcp_sack_to_ack_thresh = 700; /* 70 % */ +static int32_t tcp_sack_to_move_thresh = 600; /* 60 % */ +static int32_t tcp_restoral_thresh = 650; /* 65 % (sack:2:ack -5%) */ +static int32_t tcp_attack_on_turns_on_logging = 0; +static int32_t tcp_map_minimum = 500; +#endif +static int32_t tcp_sad_decay_val = 800; +static int32_t tcp_sad_pacing_interval = 2000; +static int32_t tcp_sad_low_pps = 100; + /* * Currently regular tcp has a rto_min of 30ms @@ -191,11 +210,11 @@ static int32_t rack_map_split_limit = 256; */ static int32_t rack_tlp_min = 10; static int32_t rack_rto_min = 30; /* 30ms same as main freebsd */ -static int32_t rack_rto_max = 30000; /* 30 seconds */ +static int32_t rack_rto_max = 4000; /* 4 seconds */ static const int32_t rack_free_cache = 2; static int32_t rack_hptsi_segments = 40; static int32_t rack_rate_sample_method = USE_RTT_LOW; -static int32_t rack_pace_every_seg = 1; +static int32_t rack_pace_every_seg = 0; static int32_t rack_delayed_ack_time = 200; /* 200ms */ static int32_t rack_slot_reduction = 4; static int32_t rack_lower_cwnd_at_tlp = 0; @@ -204,9 +223,12 @@ static int32_t rack_proportional_rate = 10; static int32_t rack_tlp_max_resend = 2; static int32_t rack_limited_retran = 0; static int32_t rack_always_send_oldest = 0; -static int32_t rack_sack_block_limit = 128; static int32_t rack_use_sack_filter = 1; static int32_t rack_tlp_threshold_use = TLP_USE_TWO_ONE; +static int32_t rack_per_of_gp = 50; +static int32_t rack_tcp_map_entries_limit = 1500; +static int32_t rack_tcp_map_split_limit = 256; + /* Rack specific counters */ counter_u64_t rack_badfr; @@ -217,8 +239,11 @@ counter_u64_t rack_timestamp_mismatch; counter_u64_t rack_reorder_seen; counter_u64_t rack_paced_segments; counter_u64_t rack_unpaced_segments; +counter_u64_t rack_calc_zero; +counter_u64_t rack_calc_nonzero; counter_u64_t rack_saw_enobuf; counter_u64_t rack_saw_enetunreach; +counter_u64_t rack_per_timer_hole; /* Tail loss probe counters */ counter_u64_t rack_tlp_tot; @@ -239,13 +264,34 @@ counter_u64_t rack_split_limited; counter_u64_t rack_sack_proc_all; counter_u64_t rack_sack_proc_short; counter_u64_t rack_sack_proc_restart; -counter_u64_t rack_runt_sacks; +counter_u64_t rack_sack_attacks_detected; +counter_u64_t rack_sack_attacks_reversed; +counter_u64_t rack_sack_used_next_merge; +counter_u64_t rack_sack_splits; +counter_u64_t rack_sack_used_prev_merge; +counter_u64_t rack_sack_skipped_acked; +counter_u64_t rack_ack_total; +counter_u64_t rack_express_sack; +counter_u64_t rack_sack_total; +counter_u64_t rack_move_none; +counter_u64_t rack_move_some; + counter_u64_t rack_used_tlpmethod; counter_u64_t rack_used_tlpmethod2; counter_u64_t rack_enter_tlp_calc; counter_u64_t rack_input_idle_reduces; +counter_u64_t rack_collapsed_win; counter_u64_t rack_tlp_does_nada; +/* Counters for HW TLS */ +counter_u64_t rack_tls_rwnd; +counter_u64_t rack_tls_cwnd; +counter_u64_t rack_tls_app; +counter_u64_t rack_tls_other; +counter_u64_t rack_tls_filled; +counter_u64_t rack_tls_rxt; +counter_u64_t rack_tls_tlp; + /* Temp CPU counters */ counter_u64_t rack_find_high; @@ -253,21 +299,12 @@ counter_u64_t rack_progress_drops; counter_u64_t rack_out_size[TCP_MSS_ACCT_SIZE]; counter_u64_t rack_opts_arry[RACK_OPTS_SIZE]; -/* - * This was originally defined in tcp_timer.c, but is now reproduced here given - * the unification of the SYN and non-SYN retransmit timer exponents combined - * with wanting to retain previous behaviour for previously deployed stack - * versions. - */ -int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] = - { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 }; - static void rack_log_progress_event(struct tcp_rack *rack, struct tcpcb *tp, uint32_t tick, int event, int line); static int rack_process_ack(struct mbuf *m, struct tcphdr *th, - struct socket *so, struct tcpcb *tp, struct tcpopt *to, + struct socket *so, struct tcpcb *tp, struct tcpopt *to, uint32_t tiwin, int32_t tlen, int32_t * ofia, int32_t thflags, int32_t * ret_val); static int rack_process_data(struct mbuf *m, struct tcphdr *th, @@ -320,17 +357,13 @@ rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len, static void rack_log_sack_passed(struct tcpcb *tp, struct tcp_rack *rack, struct rack_sendmap *rsm); -static void rack_log_to_event(struct tcp_rack *rack, int32_t to_num); +static void rack_log_to_event(struct tcp_rack *rack, int32_t to_num, int num); static int32_t rack_output(struct tcpcb *tp); -static void -rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, - struct socket *so, struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, - uint8_t iptos, int32_t nxt_pkt, struct timeval *tv); static uint32_t rack_proc_sack_blk(struct tcpcb *tp, struct tcp_rack *rack, struct sackblk *sack, struct tcpopt *to, struct rack_sendmap **prsm, - uint32_t cts); + uint32_t cts, int *moved_two); static void rack_post_recovery(struct tcpcb *tp, struct tcphdr *th); static void rack_remxt_tmr(struct tcpcb *tp); static int @@ -354,9 +387,6 @@ static int rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack, struct rack_sendmap *rsm, struct tcpopt *to, uint32_t cts, int32_t ack_type); static int32_t tcp_addrack(module_t mod, int32_t type, void *data); -static void -rack_challenge_ack(struct mbuf *m, struct tcphdr *th, - struct tcpcb *tp, int32_t * ret_val); static int rack_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, @@ -365,13 +395,6 @@ static int rack_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt); -static void rack_do_drop(struct mbuf *m, struct tcpcb *tp); -static void -rack_do_dropafterack(struct mbuf *m, struct tcpcb *tp, - struct tcphdr *th, int32_t thflags, int32_t tlen, int32_t * ret_val); -static void -rack_do_dropwithreset(struct mbuf *m, struct tcpcb *tp, - struct tcphdr *th, int32_t rstreason, int32_t tlen); static int rack_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, @@ -400,13 +423,6 @@ static int rack_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt); -static int -rack_drop_checks(struct tcpopt *to, struct mbuf *m, - struct tcphdr *th, struct tcpcb *tp, int32_t * tlenp, int32_t * thf, - int32_t * drop_hdrlen, int32_t * ret_val); -static int -rack_process_rst(struct mbuf *m, struct tcphdr *th, - struct socket *so, struct tcpcb *tp); struct rack_sendmap * tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack, uint32_t tsused); @@ -414,10 +430,6 @@ static void tcp_rack_xmit_timer(struct tcp_rack *rack, int32_t rtt); static void tcp_rack_partialack(struct tcpcb *tp, struct tcphdr *th); -static int -rack_ts_check(struct mbuf *m, struct tcphdr *th, - struct tcpcb *tp, int32_t tlen, int32_t thflags, int32_t * ret_val); - int32_t rack_clear_counter=0; @@ -453,9 +465,12 @@ sysctl_rack_clear(SYSCTL_HANDLER_ARGS) counter_u64_zero(rack_to_arm_rack); counter_u64_zero(rack_to_arm_tlp); counter_u64_zero(rack_paced_segments); + counter_u64_zero(rack_calc_zero); + counter_u64_zero(rack_calc_nonzero); counter_u64_zero(rack_unpaced_segments); counter_u64_zero(rack_saw_enobuf); counter_u64_zero(rack_saw_enetunreach); + counter_u64_zero(rack_per_timer_hole); counter_u64_zero(rack_to_alloc_hard); counter_u64_zero(rack_to_alloc_emerg); counter_u64_zero(rack_sack_proc_all); @@ -466,12 +481,31 @@ sysctl_rack_clear(SYSCTL_HANDLER_ARGS) counter_u64_zero(rack_alloc_limited_conns); counter_u64_zero(rack_split_limited); counter_u64_zero(rack_find_high); - counter_u64_zero(rack_runt_sacks); + counter_u64_zero(rack_tls_rwnd); + counter_u64_zero(rack_tls_cwnd); + counter_u64_zero(rack_tls_app); + counter_u64_zero(rack_tls_other); + counter_u64_zero(rack_tls_filled); + counter_u64_zero(rack_tls_rxt); + counter_u64_zero(rack_tls_tlp); + counter_u64_zero(rack_sack_attacks_detected); + counter_u64_zero(rack_sack_attacks_reversed); + counter_u64_zero(rack_sack_used_next_merge); + counter_u64_zero(rack_sack_used_prev_merge); + counter_u64_zero(rack_sack_splits); + counter_u64_zero(rack_sack_skipped_acked); + counter_u64_zero(rack_ack_total); + counter_u64_zero(rack_express_sack); + counter_u64_zero(rack_sack_total); + counter_u64_zero(rack_move_none); + counter_u64_zero(rack_move_some); counter_u64_zero(rack_used_tlpmethod); counter_u64_zero(rack_used_tlpmethod2); counter_u64_zero(rack_enter_tlp_calc); counter_u64_zero(rack_progress_drops); counter_u64_zero(rack_tlp_does_nada); + counter_u64_zero(rack_collapsed_win); + } rack_clear_counter = 0; return (0); @@ -482,18 +516,9 @@ sysctl_rack_clear(SYSCTL_HANDLER_ARGS) static void rack_init_sysctls() { - SYSCTL_ADD_S32(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "map_limit", CTLFLAG_RW, - &rack_map_entries_limit , 1024, - "Is there a limit on how big the sendmap can grow? "); - - SYSCTL_ADD_S32(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "map_splitlimit", CTLFLAG_RW, - &rack_map_split_limit , 256, - "Is there a limit on how much splitting a peer can do?"); - + struct sysctl_oid *rack_counters; + struct sysctl_oid *rack_attack; + SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "rate_sample_method", CTLFLAG_RW, @@ -501,31 +526,52 @@ rack_init_sysctls() "What method should we use for rate sampling 0=high, 1=low "); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), + OID_AUTO, "hw_tlsmax", CTLFLAG_RW, + &rack_hw_tls_max_seg , 0, + "Do we have a multplier of TLS records we can send as a max (0=1 TLS record)? "); + SYSCTL_ADD_S32(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "data_after_close", CTLFLAG_RW, &rack_ignore_data_after_close, 0, "Do we hold off sending a RST until all pending data is ack'd"); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), + OID_AUTO, "cheat_rxt", CTLFLAG_RW, + &use_rack_cheat, 1, + "Do we use the rxt cheat for rack?"); + + SYSCTL_ADD_U32(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_sysctl_root), + OID_AUTO, "persmin", CTLFLAG_RW, + &rack_persist_min, 250, + "What is the minimum time in milliseconds between persists"); + SYSCTL_ADD_U32(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_sysctl_root), + OID_AUTO, "persmax", CTLFLAG_RW, + &rack_persist_max, 1000, + "What is the largest delay in milliseconds between persists"); + SYSCTL_ADD_S32(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_sysctl_root), + OID_AUTO, "no_sack_needed", CTLFLAG_RW, + &rack_sack_not_required, 0, + "Do we allow rack to run on connections not supporting SACK?"); + SYSCTL_ADD_S32(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "tlpmethod", CTLFLAG_RW, &rack_tlp_threshold_use, TLP_USE_TWO_ONE, "What method do we do for TLP time calc 0=no-de-ack-comp, 1=ID, 2=2.1, 3=2.2"); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), + OID_AUTO, "gp_percentage", CTLFLAG_RW, + &rack_per_of_gp, 50, + "Do we pace to percentage of goodput (0=old method)?"); + SYSCTL_ADD_S32(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "min_pace_time", CTLFLAG_RW, &rack_min_pace_time, 0, "Should we enforce a minimum pace time of 1ms"); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "min_pace_segs", CTLFLAG_RW, - &rack_min_pace_time_seg_req, 6, - "How many segments have to be in the len to enforce min-pace-time"); - SYSCTL_ADD_S32(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "idle_reduce_high", CTLFLAG_RW, - &rack_reduce_largest_on_idle, 0, - "Should we reduce the largest cwnd seen to IW on idle reduction"); - SYSCTL_ADD_S32(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "bb_verbose", CTLFLAG_RW, &rack_verbose_logging, 0, "Should RACK black box logging be verbose"); @@ -546,26 +592,11 @@ rack_init_sysctls() "TLP minimum timeout per the specification (10ms)"); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "precache", CTLFLAG_RW, - &rack_precache, 0, - "Where should we precache the mcopy (0 is not at all)"); - SYSCTL_ADD_S32(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "sblklimit", CTLFLAG_RW, - &rack_sack_block_limit, 128, - "When do we start paying attention to small sack blocks"); - SYSCTL_ADD_S32(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "send_oldest", CTLFLAG_RW, &rack_always_send_oldest, 1, "Should we always send the oldest TLP and RACK-TLP"); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "rack_tlp_in_recovery", CTLFLAG_RW, - &rack_tlp_in_recovery, 1, - "Can we do a TLP during recovery?"); - SYSCTL_ADD_S32(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "rack_tlimit", CTLFLAG_RW, &rack_limited_retran, 0, "How many times can a rack timeout drive out sends"); @@ -607,12 +638,12 @@ rack_init_sysctls() SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "hptsi_every_seg", CTLFLAG_RW, - &rack_pace_every_seg, 1, - "Should we pace out every segment hptsi"); + &rack_pace_every_seg, 0, + "Should we use the original pacing mechanism that did not pace much?"); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "hptsi_seg_max", CTLFLAG_RW, - &rack_hptsi_segments, 6, + &rack_hptsi_segments, 40, "Should we pace out only a limited size of segments"); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), @@ -626,11 +657,6 @@ rack_init_sysctls() "Minimum rack timeout in milliseconds"); SYSCTL_ADD_S32(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "earlyrecoveryseg", CTLFLAG_RW, - &rack_early_recovery_max_seg, 6, - "Max segments in early recovery"); - SYSCTL_ADD_S32(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "earlyrecovery", CTLFLAG_RW, &rack_early_recovery, 1, "Do we do early recovery with rack"); @@ -654,221 +680,376 @@ rack_init_sysctls() OID_AUTO, "pktdelay", CTLFLAG_RW, &rack_pkt_delay, 1, "Extra RACK time (in ms) besides reordering thresh"); - SYSCTL_ADD_S32(&rack_sysctl_ctx, + + rack_counters = SYSCTL_ADD_NODE(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "inc_var", CTLFLAG_RW, - &rack_inc_var, 0, - "Should rack add to the TLP timer the variance in rtt calculation"); + OID_AUTO, + "stats", + CTLFLAG_RW, 0, + "Rack Counters"); rack_badfr = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "badfr", CTLFLAG_RD, &rack_badfr, "Total number of bad FRs"); rack_badfr_bytes = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "badfr_bytes", CTLFLAG_RD, &rack_badfr_bytes, "Total number of bad FRs"); rack_rtm_prr_retran = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "prrsndret", CTLFLAG_RD, &rack_rtm_prr_retran, "Total number of prr based retransmits"); rack_rtm_prr_newdata = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "prrsndnew", CTLFLAG_RD, &rack_rtm_prr_newdata, "Total number of prr based new transmits"); rack_timestamp_mismatch = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "tsnf", CTLFLAG_RD, &rack_timestamp_mismatch, "Total number of timestamps that we could not find the reported ts"); rack_find_high = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "findhigh", CTLFLAG_RD, &rack_find_high, "Total number of FIN causing find-high"); rack_reorder_seen = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "reordering", CTLFLAG_RD, &rack_reorder_seen, "Total number of times we added delay due to reordering"); rack_tlp_tot = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "tlp_to_total", CTLFLAG_RD, &rack_tlp_tot, "Total number of tail loss probe expirations"); rack_tlp_newdata = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "tlp_new", CTLFLAG_RD, &rack_tlp_newdata, "Total number of tail loss probe sending new data"); rack_tlp_retran = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "tlp_retran", CTLFLAG_RD, &rack_tlp_retran, "Total number of tail loss probe sending retransmitted data"); rack_tlp_retran_bytes = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "tlp_retran_bytes", CTLFLAG_RD, &rack_tlp_retran_bytes, "Total bytes of tail loss probe sending retransmitted data"); rack_tlp_retran_fail = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "tlp_retran_fail", CTLFLAG_RD, &rack_tlp_retran_fail, "Total number of tail loss probe sending retransmitted data that failed (wait for t3)"); rack_to_tot = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "rack_to_tot", CTLFLAG_RD, &rack_to_tot, "Total number of times the rack to expired?"); rack_to_arm_rack = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "arm_rack", CTLFLAG_RD, &rack_to_arm_rack, "Total number of times the rack timer armed?"); rack_to_arm_tlp = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "arm_tlp", CTLFLAG_RD, &rack_to_arm_tlp, "Total number of times the tlp timer armed?"); + + rack_calc_zero = counter_u64_alloc(M_WAITOK); + rack_calc_nonzero = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "calc_zero", CTLFLAG_RD, + &rack_calc_zero, + "Total number of times pacing time worked out to zero?"); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "calc_nonzero", CTLFLAG_RD, + &rack_calc_nonzero, + "Total number of times pacing time worked out to non-zero?"); rack_paced_segments = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "paced", CTLFLAG_RD, &rack_paced_segments, "Total number of times a segment send caused hptsi"); rack_unpaced_segments = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "unpaced", CTLFLAG_RD, &rack_unpaced_segments, "Total number of times a segment did not cause hptsi"); rack_saw_enobuf = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "saw_enobufs", CTLFLAG_RD, &rack_saw_enobuf, "Total number of times a segment did not cause hptsi"); rack_saw_enetunreach = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "saw_enetunreach", CTLFLAG_RD, &rack_saw_enetunreach, "Total number of times a segment did not cause hptsi"); rack_to_alloc = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "allocs", CTLFLAG_RD, &rack_to_alloc, "Total allocations of tracking structures"); rack_to_alloc_hard = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "allochard", CTLFLAG_RD, &rack_to_alloc_hard, "Total allocations done with sleeping the hard way"); rack_to_alloc_emerg = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "allocemerg", CTLFLAG_RD, &rack_to_alloc_emerg, "Total allocations done from emergency cache"); rack_to_alloc_limited = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "alloc_limited", CTLFLAG_RD, &rack_to_alloc_limited, "Total allocations dropped due to limit"); rack_alloc_limited_conns = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "alloc_limited_conns", CTLFLAG_RD, &rack_alloc_limited_conns, "Connections with allocations dropped due to limit"); rack_split_limited = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "split_limited", CTLFLAG_RD, &rack_split_limited, "Split allocations dropped due to limit"); rack_sack_proc_all = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "sack_long", CTLFLAG_RD, &rack_sack_proc_all, "Total times we had to walk whole list for sack processing"); rack_sack_proc_restart = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "sack_restart", CTLFLAG_RD, &rack_sack_proc_restart, "Total times we had to walk whole list due to a restart"); rack_sack_proc_short = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "sack_short", CTLFLAG_RD, &rack_sack_proc_short, "Total times we took shortcut for sack processing"); rack_enter_tlp_calc = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "tlp_calc_entered", CTLFLAG_RD, &rack_enter_tlp_calc, "Total times we called calc-tlp"); rack_used_tlpmethod = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "hit_tlp_method", CTLFLAG_RD, &rack_used_tlpmethod, "Total number of runt sacks"); rack_used_tlpmethod2 = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "hit_tlp_method2", CTLFLAG_RD, &rack_used_tlpmethod2, - "Total number of runt sacks 2"); - rack_runt_sacks = counter_u64_alloc(M_WAITOK); - SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + "Total number of times we hit TLP method 2"); + /* Sack Attacker detection stuff */ + rack_attack = SYSCTL_ADD_NODE(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), - OID_AUTO, "runtsacks", CTLFLAG_RD, - &rack_runt_sacks, - "Total number of runt sacks"); + OID_AUTO, + "sack_attack", + CTLFLAG_RW, 0, + "Rack Sack Attack Counters and Controls"); + SYSCTL_ADD_U32(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "detect_highsackratio", CTLFLAG_RW, + &rack_highest_sack_thresh_seen, 0, + "Highest sack to ack ratio seen"); + SYSCTL_ADD_U32(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "detect_highmoveratio", CTLFLAG_RW, + &rack_highest_move_thresh_seen, 0, + "Highest move to non-move ratio seen"); + rack_ack_total = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "acktotal", CTLFLAG_RD, + &rack_ack_total, + "Total number of Ack's"); + + rack_express_sack = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "exp_sacktotal", CTLFLAG_RD, + &rack_express_sack, + "Total expresss number of Sack's"); + rack_sack_total = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "sacktotal", CTLFLAG_RD, + &rack_sack_total, + "Total number of SACK's"); + rack_move_none = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "move_none", CTLFLAG_RD, + &rack_move_none, + "Total number of SACK index reuse of postions under threshold"); + rack_move_some = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "move_some", CTLFLAG_RD, + &rack_move_some, + "Total number of SACK index reuse of postions over threshold"); + rack_sack_attacks_detected = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "attacks", CTLFLAG_RD, + &rack_sack_attacks_detected, + "Total number of SACK attackers that had sack disabled"); + rack_sack_attacks_reversed = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "reversed", CTLFLAG_RD, + &rack_sack_attacks_reversed, + "Total number of SACK attackers that were later determined false positive"); + rack_sack_used_next_merge = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "nextmerge", CTLFLAG_RD, + &rack_sack_used_next_merge, + "Total number of times we used the next merge"); + rack_sack_used_prev_merge = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "prevmerge", CTLFLAG_RD, + &rack_sack_used_prev_merge, + "Total number of times we used the prev merge"); + rack_sack_skipped_acked = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "skipacked", CTLFLAG_RD, + &rack_sack_skipped_acked, + "Total number of times we skipped previously sacked"); + rack_sack_splits = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_attack), + OID_AUTO, "ofsplit", CTLFLAG_RD, + &rack_sack_splits, + "Total number of times we did the old fashion tree split"); rack_progress_drops = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "prog_drops", CTLFLAG_RD, &rack_progress_drops, "Total number of progress drops"); rack_input_idle_reduces = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "idle_reduce_oninput", CTLFLAG_RD, &rack_input_idle_reduces, "Total number of idle reductions on input"); + rack_collapsed_win = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "collapsed_win", CTLFLAG_RD, + &rack_collapsed_win, + "Total number of collapsed windows"); rack_tlp_does_nada = counter_u64_alloc(M_WAITOK); SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, - SYSCTL_CHILDREN(rack_sysctl_root), + SYSCTL_CHILDREN(rack_counters), OID_AUTO, "tlp_nada", CTLFLAG_RD, &rack_tlp_does_nada, "Total number of nada tlp calls"); + + rack_tls_rwnd = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "tls_rwnd", CTLFLAG_RD, + &rack_tls_rwnd, + "Total hdwr tls rwnd limited"); + + rack_tls_cwnd = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "tls_cwnd", CTLFLAG_RD, + &rack_tls_cwnd, + "Total hdwr tls cwnd limited"); + + rack_tls_app = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "tls_app", CTLFLAG_RD, + &rack_tls_app, + "Total hdwr tls app limited"); + + rack_tls_other = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "tls_other", CTLFLAG_RD, + &rack_tls_other, + "Total hdwr tls other limited"); + + rack_tls_filled = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "tls_filled", CTLFLAG_RD, + &rack_tls_filled, + "Total hdwr tls filled"); + + rack_tls_rxt = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "tls_rxt", CTLFLAG_RD, + &rack_tls_rxt, + "Total hdwr rxt"); + + rack_tls_tlp = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "tls_tlp", CTLFLAG_RD, + &rack_tls_tlp, + "Total hdwr tls tlp"); + rack_per_timer_hole = counter_u64_alloc(M_WAITOK); + SYSCTL_ADD_COUNTER_U64(&rack_sysctl_ctx, + SYSCTL_CHILDREN(rack_counters), + OID_AUTO, "timer_hole", CTLFLAG_RD, + &rack_per_timer_hole, + "Total persists start in timer hole"); + COUNTER_ARRAY_ALLOC(rack_out_size, TCP_MSS_ACCT_SIZE, M_WAITOK); SYSCTL_ADD_COUNTER_U64_ARRAY(&rack_sysctl_ctx, SYSCTL_CHILDREN(rack_sysctl_root), OID_AUTO, "outsize", CTLFLAG_RD, @@ -883,10 +1064,52 @@ rack_init_sysctls() &rack_clear_counter, 0, sysctl_rack_clear, "IU", "Clear counters"); } +static __inline int +rb_map_cmp(struct rack_sendmap *b, struct rack_sendmap *a) +{ + if (SEQ_GEQ(b->r_start, a->r_start) && + SEQ_LT(b->r_start, a->r_end)) { + /* + * The entry b is within the + * block a. i.e.: + * a -- |-------------| + * b -- |----| + * <or> + * b -- |------| + * <or> + * b -- |-----------| + */ + return (0); + } else if (SEQ_GEQ(b->r_start, a->r_end)) { + /* + * b falls as either the next + * sequence block after a so a + * is said to be smaller than b. + * i.e: + * a -- |------| + * b -- |--------| + * or + * b -- |-----| + */ + return (1); + } + /* + * Whats left is where a is + * larger than b. i.e: + * a -- |-------| + * b -- |---| + * or even possibly + * b -- |--------------| + */ + return (-1); +} + +RB_PROTOTYPE(rack_rb_tree_head, rack_sendmap, r_next, rb_map_cmp); +RB_GENERATE(rack_rb_tree_head, rack_sendmap, r_next, rb_map_cmp); + static inline int32_t rack_progress_timeout_check(struct tcpcb *tp) { -#ifdef NETFLIX_PROGRESS if (tp->t_maxunacktime && tp->t_acktime && TSTMP_GT(ticks, tp->t_acktime)) { if ((ticks - tp->t_acktime) >= tp->t_maxunacktime) { /* @@ -897,21 +1120,52 @@ rack_progress_timeout_check(struct tcpcb *tp) struct tcp_rack *rack; rack = (struct tcp_rack *)tp->t_fb_ptr; counter_u64_add(rack_progress_drops, 1); +#ifdef NETFLIX_STATS TCPSTAT_INC(tcps_progdrops); +#endif rack_log_progress_event(rack, tp, ticks, PROGRESS_DROP, __LINE__); return (1); } } -#endif return (0); } + +static void +rack_log_retran_reason(struct tcp_rack *rack, struct rack_sendmap *rsm, uint32_t tsused, uint32_t thresh, int mod) +{ + if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + struct timeval tv; + memset(&log.u_bbr, 0, sizeof(log.u_bbr)); + log.u_bbr.flex1 = tsused; + log.u_bbr.flex2 = thresh; + log.u_bbr.flex3 = rsm->r_flags; + log.u_bbr.flex4 = rsm->r_dupack; + log.u_bbr.flex5 = rsm->r_start; + log.u_bbr.flex6 = rsm->r_end; + log.u_bbr.flex8 = mod; + log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; + log.u_bbr.ininput = rack->rc_inp->inp_in_input; + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, + &rack->rc_inp->inp_socket->so_rcv, + &rack->rc_inp->inp_socket->so_snd, + BBR_LOG_SETTINGS_CHG, 0, + 0, &log, false, &tv); + } +} + + + static void rack_log_to_start(struct tcp_rack *rack, uint32_t cts, uint32_t to, int32_t slot, uint8_t which) { if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.flex1 = TICKS_2_MSEC(rack->rc_tp->t_srtt >> TCP_RTT_SHIFT); @@ -920,22 +1174,27 @@ rack_log_to_start(struct tcp_rack *rack, uint32_t cts, uint32_t to, int32_t slot log.u_bbr.flex4 = slot; log.u_bbr.flex5 = rack->rc_inp->inp_hptsslot; log.u_bbr.flex6 = rack->rc_tp->t_rxtcur; + log.u_bbr.flex7 = rack->rc_in_persist; log.u_bbr.flex8 = which; + log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt; log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; log.u_bbr.ininput = rack->rc_inp->inp_in_input; - TCP_LOG_EVENT(rack->rc_tp, NULL, + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_TIMERSTAR, 0, - 0, &log, false); + 0, &log, false, &tv); } } static void -rack_log_to_event(struct tcp_rack *rack, int32_t to_num) +rack_log_to_event(struct tcp_rack *rack, int32_t to_num, int no) { if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; @@ -943,11 +1202,15 @@ rack_log_to_event(struct tcp_rack *rack, int32_t to_num) log.u_bbr.flex8 = to_num; log.u_bbr.flex1 = rack->r_ctl.rc_rack_min_rtt; log.u_bbr.flex2 = rack->rc_rack_rtt; - TCP_LOG_EVENT(rack->rc_tp, NULL, + log.u_bbr.flex3 = no; + log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt; + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_RTO, 0, - 0, &log, false); + 0, &log, false, &tv); } } @@ -957,6 +1220,7 @@ rack_log_rtt_upd(struct tcpcb *tp, struct tcp_rack *rack, int32_t t, { if (tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; @@ -969,11 +1233,14 @@ rack_log_rtt_upd(struct tcpcb *tp, struct tcp_rack *rack, int32_t t, log.u_bbr.flex6 = rack->r_ctl.rack_rs.rs_rtt_cnt; log.u_bbr.rttProp = rack->r_ctl.rack_rs.rs_rtt_tot; log.u_bbr.flex8 = rack->r_ctl.rc_rate_sample_method; - TCP_LOG_EVENT(tp, NULL, + log.u_bbr.pkts_out = rack->r_ctl.rc_prr_sndcnt; + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_BBRRTT, 0, - 0, &log, false); + 0, &log, false, &tv); } } @@ -989,10 +1256,16 @@ rack_log_rtt_sample(struct tcp_rack *rack, uint32_t rtt) union tcp_log_stackspecific log; struct timeval tv; - memset(&log, 0, sizeof(log)); /* Convert our ms to a microsecond */ + memset(&log, 0, sizeof(log)); log.u_bbr.flex1 = rtt * 1000; + log.u_bbr.flex2 = rack->r_ctl.ack_count; + log.u_bbr.flex3 = rack->r_ctl.sack_count; + log.u_bbr.flex4 = rack->r_ctl.sack_noextra_move; + log.u_bbr.flex5 = rack->r_ctl.sack_moved_extra; + log.u_bbr.flex8 = rack->sack_attack_disable; log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); TCP_LOG_EVENTP(rack->rc_tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, @@ -1007,6 +1280,7 @@ rack_log_progress_event(struct tcp_rack *rack, struct tcpcb *tp, uint32_t tick, { if (rack_verbose_logging && (tp->t_logstate != TCP_LOG_STATE_OFF)) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; @@ -1016,11 +1290,13 @@ rack_log_progress_event(struct tcp_rack *rack, struct tcpcb *tp, uint32_t tick, log.u_bbr.flex3 = tp->t_maxunacktime; log.u_bbr.flex4 = tp->t_acktime; log.u_bbr.flex8 = event; - TCP_LOG_EVENT(tp, NULL, + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_PROGRESS, 0, - 0, &log, false); + 0, &log, false, &tv); } } @@ -1029,18 +1305,22 @@ rack_log_type_bbrsnd(struct tcp_rack *rack, uint32_t len, uint32_t slot, uint32_ { if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; log.u_bbr.ininput = rack->rc_inp->inp_in_input; log.u_bbr.flex1 = slot; + log.u_bbr.flex2 = rack->r_ctl.rc_prr_sndcnt; log.u_bbr.flex7 = (0x0000ffff & rack->r_ctl.rc_hpts_flags); log.u_bbr.flex8 = rack->rc_in_persist; - TCP_LOG_EVENT(rack->rc_tp, NULL, + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_BBRSND, 0, - 0, &log, false); + 0, &log, false, &tv); } } @@ -1049,41 +1329,76 @@ rack_log_doseg_done(struct tcp_rack *rack, uint32_t cts, int32_t nxt_pkt, int32_ { if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log, 0, sizeof(log)); log.u_bbr.flex1 = did_out; log.u_bbr.flex2 = nxt_pkt; log.u_bbr.flex3 = way_out; log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags; + log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt; + log.u_bbr.applimited = rack->r_ctl.rc_pace_min_segs; log.u_bbr.flex7 = rack->r_wanted_output; log.u_bbr.flex8 = rack->rc_in_persist; - TCP_LOG_EVENT(rack->rc_tp, NULL, + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_DOSEG_DONE, 0, - 0, &log, false); + 0, &log, false, &tv); } } +static void +rack_log_type_hrdwtso(struct tcpcb *tp, struct tcp_rack *rack, int len, int mod, int32_t orig_len, int frm) +{ + if (tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + struct timeval tv; + uint32_t cts; + memset(&log, 0, sizeof(log)); + cts = tcp_get_usecs(&tv); + log.u_bbr.flex1 = rack->r_ctl.rc_pace_min_segs; + log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs; + log.u_bbr.flex4 = len; + log.u_bbr.flex5 = orig_len; + log.u_bbr.flex6 = rack->r_ctl.rc_sacked; + log.u_bbr.flex7 = mod; + log.u_bbr.flex8 = frm; + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(tp, NULL, + &tp->t_inpcb->inp_socket->so_rcv, + &tp->t_inpcb->inp_socket->so_snd, + TCP_HDWR_TLS, 0, + 0, &log, false, &tv); + } +} + static void rack_log_type_just_return(struct tcp_rack *rack, uint32_t cts, uint32_t tlen, uint32_t slot, uint8_t hpts_calling) { if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; log.u_bbr.ininput = rack->rc_inp->inp_in_input; log.u_bbr.flex1 = slot; log.u_bbr.flex2 = rack->r_ctl.rc_hpts_flags; + log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt; log.u_bbr.flex7 = hpts_calling; log.u_bbr.flex8 = rack->rc_in_persist; - TCP_LOG_EVENT(rack->rc_tp, NULL, + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_JUSTRET, 0, - tlen, &log, false); + tlen, &log, false, &tv); } } @@ -1092,6 +1407,7 @@ rack_log_to_cancel(struct tcp_rack *rack, int32_t hpts_removed, int line) { if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; @@ -1100,13 +1416,16 @@ rack_log_to_cancel(struct tcp_rack *rack, int32_t hpts_removed, int line) log.u_bbr.flex2 = 0; log.u_bbr.flex3 = rack->r_ctl.rc_hpts_flags; log.u_bbr.flex4 = 0; + log.u_bbr.flex5 = rack->r_ctl.rc_prr_sndcnt; log.u_bbr.flex6 = rack->rc_tp->t_rxtcur; log.u_bbr.flex8 = hpts_removed; - TCP_LOG_EVENT(rack->rc_tp, NULL, + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_TIMERCANC, 0, - 0, &log, false); + 0, &log, false, &tv); } } @@ -1115,6 +1434,7 @@ rack_log_to_processing(struct tcp_rack *rack, uint32_t cts, int32_t ret, int32_t { if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.flex1 = timers; @@ -1122,15 +1442,76 @@ rack_log_to_processing(struct tcp_rack *rack, uint32_t cts, int32_t ret, int32_t log.u_bbr.flex3 = rack->r_ctl.rc_timer_exp; log.u_bbr.flex4 = rack->r_ctl.rc_hpts_flags; log.u_bbr.flex5 = cts; - TCP_LOG_EVENT(rack->rc_tp, NULL, + log.u_bbr.flex6 = rack->r_ctl.rc_prr_sndcnt; + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, &rack->rc_inp->inp_socket->so_rcv, &rack->rc_inp->inp_socket->so_snd, BBR_LOG_TO_PROCESS, 0, - 0, &log, false); + 0, &log, false, &tv); } } static void +rack_log_to_prr(struct tcp_rack *rack, int frm) +{ + if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + struct timeval tv; + + memset(&log.u_bbr, 0, sizeof(log.u_bbr)); + log.u_bbr.flex1 = rack->r_ctl.rc_prr_out; + log.u_bbr.flex2 = rack->r_ctl.rc_prr_recovery_fs; + log.u_bbr.flex3 = rack->r_ctl.rc_prr_sndcnt; + log.u_bbr.flex4 = rack->r_ctl.rc_prr_delivered; + log.u_bbr.flex5 = rack->r_ctl.rc_sacked; + log.u_bbr.flex6 = rack->r_ctl.rc_holes_rxt; + log.u_bbr.flex8 = frm; + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + TCP_LOG_EVENTP(rack->rc_tp, NULL, + &rack->rc_inp->inp_socket->so_rcv, + &rack->rc_inp->inp_socket->so_snd, + BBR_LOG_BBRUPD, 0, + 0, &log, false, &tv); + } +} + +#ifdef NETFLIX_EXP_DETECTION +static void +rack_log_sad(struct tcp_rack *rack, int event) +{ + if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) { + union tcp_log_stackspecific log; + struct timeval tv; + + memset(&log.u_bbr, 0, sizeof(log.u_bbr)); + log.u_bbr.flex1 = rack->r_ctl.sack_count; + log.u_bbr.flex2 = rack->r_ctl.ack_count; + log.u_bbr.flex3 = rack->r_ctl.sack_moved_extra; + log.u_bbr.flex4 = rack->r_ctl.sack_noextra_move; + log.u_bbr.flex5 = rack->r_ctl.rc_num_maps_alloced; + log.u_bbr.flex6 = tcp_sack_to_ack_thresh; + log.u_bbr.pkts_out = tcp_sack_to_move_thresh; + log.u_bbr.lt_epoch = (tcp_force_detection << 8); + log.u_bbr.lt_epoch |= rack->do_detection; + log.u_bbr.applimited = tcp_map_minimum; + log.u_bbr.flex7 = rack->sack_attack_disable; + log.u_bbr.flex8 = event; + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + log.u_bbr.delivered = tcp_sad_decay_val; + TCP_LOG_EVENTP(rack->rc_tp, NULL, + &rack->rc_inp->inp_socket->so_rcv, + &rack->rc_inp->inp_socket->so_snd, + TCP_SAD_DETECTION, 0, + 0, &log, false, &tv); + } +} +#endif + +static void rack_counter_destroy() { counter_u64_free(rack_badfr); @@ -1158,14 +1539,15 @@ rack_counter_destroy() counter_u64_free(rack_sack_proc_restart); counter_u64_free(rack_to_alloc); counter_u64_free(rack_to_alloc_limited); + counter_u64_free(rack_alloc_limited_conns); counter_u64_free(rack_split_limited); counter_u64_free(rack_find_high); - counter_u64_free(rack_runt_sacks); counter_u64_free(rack_enter_tlp_calc); counter_u64_free(rack_used_tlpmethod); counter_u64_free(rack_used_tlpmethod2); counter_u64_free(rack_progress_drops); counter_u64_free(rack_input_idle_reduces); + counter_u64_free(rack_collapsed_win); counter_u64_free(rack_tlp_does_nada); COUNTER_ARRAY_FREE(rack_out_size, TCP_MSS_ACCT_SIZE); COUNTER_ARRAY_FREE(rack_opts_arry, RACK_OPTS_SIZE); @@ -1185,7 +1567,7 @@ rack_alloc(struct tcp_rack *rack) if (rack->rc_free_cnt) { counter_u64_add(rack_to_alloc_emerg, 1); rsm = TAILQ_FIRST(&rack->r_ctl.rc_free); - TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_next); + TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext); rack->rc_free_cnt--; return (rsm); } @@ -1195,8 +1577,9 @@ rack_alloc(struct tcp_rack *rack) static struct rack_sendmap * rack_alloc_full_limit(struct tcp_rack *rack) { - if ((rack_map_entries_limit > 0) && - (rack->r_ctl.rc_num_maps_alloced >= rack_map_entries_limit)) { + if ((rack_tcp_map_entries_limit > 0) && + (rack->do_detection == 0) && + (rack->r_ctl.rc_num_maps_alloced >= rack_tcp_map_entries_limit)) { counter_u64_add(rack_to_alloc_limited, 1); if (!rack->alloc_limit_reported) { rack->alloc_limit_reported = 1; @@ -1215,8 +1598,9 @@ rack_alloc_limit(struct tcp_rack *rack, uint8_t limit_type) if (limit_type) { /* currently there is only one limit type */ - if (rack_map_split_limit > 0 && - rack->r_ctl.rc_num_split_allocs >= rack_map_split_limit) { + if (rack_tcp_map_split_limit > 0 && + (rack->do_detection == 0) && + rack->r_ctl.rc_num_split_allocs >= rack_tcp_map_split_limit) { counter_u64_add(rack_split_limited, 1); if (!rack->alloc_limit_reported) { rack->alloc_limit_reported = 1; @@ -1244,13 +1628,11 @@ rack_free(struct tcp_rack *rack, struct rack_sendmap *rsm) } if (rack->r_ctl.rc_tlpsend == rsm) rack->r_ctl.rc_tlpsend = NULL; - if (rack->r_ctl.rc_next == rsm) - rack->r_ctl.rc_next = NULL; if (rack->r_ctl.rc_sacklast == rsm) rack->r_ctl.rc_sacklast = NULL; if (rack->rc_free_cnt < rack_free_cache) { memset(rsm, 0, sizeof(struct rack_sendmap)); - TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_next); + TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_tnext); rsm->r_limit_type = 0; rack->rc_free_cnt++; return; @@ -1271,13 +1653,12 @@ rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack, struct tcphdr *th, ui #endif INP_WLOCK_ASSERT(tp->t_inpcb); - tp->ccv->nsegs = nsegs; tp->ccv->bytes_this_ack = BYTES_THIS_ACK(tp, th); if ((recovery) && (rack->r_ctl.rc_early_recovery_segs)) { uint32_t max; - max = rack->r_ctl.rc_early_recovery_segs * tp->t_maxseg; + max = rack->r_ctl.rc_early_recovery_segs * ctf_fixed_maxseg(tp); if (tp->ccv->bytes_this_ack > max) { tp->ccv->bytes_this_ack = max; } @@ -1295,6 +1676,12 @@ rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack, struct tcphdr *th, ui SEQ_GEQ(th->th_ack, tp->gput_ack)) { gput = (((int64_t) (th->th_ack - tp->gput_seq)) << 3) / max(1, tcp_ts_getticks() - tp->gput_ts); + /* We store it in bytes per ms (or kbytes per sec) */ + rack->r_ctl.rc_gp_history[rack->r_ctl.rc_gp_hist_idx] = gput / 8; + rack->r_ctl.rc_gp_hist_idx++; + if (rack->r_ctl.rc_gp_hist_idx >= RACK_GP_HIST) + rack->r_ctl.rc_gp_hist_filled = 1; + rack->r_ctl.rc_gp_hist_idx %= RACK_GP_HIST; stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT, gput); /* @@ -1309,6 +1696,7 @@ rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack, struct tcphdr *th, ui tp->t_stats_gput_prev); tp->t_flags &= ~TF_GPUTINPROG; tp->t_stats_gput_prev = gput; + if (tp->t_maxpeakrate) { /* * We update t_peakrate_thr. This gives us roughly @@ -1320,7 +1708,7 @@ rack_ack_received(struct tcpcb *tp, struct tcp_rack *rack, struct tcphdr *th, ui #endif if (tp->snd_cwnd > tp->snd_ssthresh) { tp->t_bytes_acked += min(tp->ccv->bytes_this_ack, - nsegs * V_tcp_abc_l_var * tp->t_maxseg); + nsegs * V_tcp_abc_l_var * ctf_fixed_maxseg(tp)); if (tp->t_bytes_acked >= tp->snd_cwnd) { tp->t_bytes_acked -= tp->snd_cwnd; tp->ccv->flags |= CCF_ABC_SENTAWND; @@ -1392,9 +1780,12 @@ rack_post_recovery(struct tcpcb *tp, struct tcphdr *th) /* Suck the next prr cnt back into cwnd */ tp->snd_cwnd += rack->r_ctl.rc_prr_sndcnt; rack->r_ctl.rc_prr_sndcnt = 0; + rack_log_to_prr(rack, 1); } tp->snd_recover = tp->snd_una; EXIT_RECOVERY(tp->t_flags); + + } static void @@ -1407,13 +1798,15 @@ rack_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type) rack = (struct tcp_rack *)tp->t_fb_ptr; switch (type) { case CC_NDUPACK: -/* rack->r_ctl.rc_ssthresh_set = 1;*/ + tp->t_flags &= ~TF_WASFRECOVERY; + tp->t_flags &= ~TF_WASCRECOVERY; if (!IN_FASTRECOVERY(tp->t_flags)) { rack->r_ctl.rc_tlp_rtx_out = 0; rack->r_ctl.rc_prr_delivered = 0; rack->r_ctl.rc_prr_out = 0; rack->r_ctl.rc_loss_count = 0; - rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg; + rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp); + rack_log_to_prr(rack, 2); rack->r_ctl.rc_prr_recovery_fs = tp->snd_max - tp->snd_una; tp->snd_recover = tp->snd_max; if (tp->t_flags & TF_ECN_PERMIT) @@ -1433,8 +1826,8 @@ rack_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type) tp->t_bytes_acked = 0; EXIT_RECOVERY(tp->t_flags); tp->snd_ssthresh = max(2, min(tp->snd_wnd, tp->snd_cwnd) / 2 / - tp->t_maxseg) * tp->t_maxseg; - tp->snd_cwnd = tp->t_maxseg; + ctf_fixed_maxseg(tp)) * ctf_fixed_maxseg(tp); + tp->snd_cwnd = ctf_fixed_maxseg(tp); break; case CC_RTO_ERR: TCPSTAT_INC(tcps_sndrexmitbad); @@ -1442,10 +1835,14 @@ rack_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type) tp->snd_cwnd = tp->snd_cwnd_prev; tp->snd_ssthresh = tp->snd_ssthresh_prev; tp->snd_recover = tp->snd_recover_prev; - if (tp->t_flags & TF_WASFRECOVERY) + if (tp->t_flags & TF_WASFRECOVERY) { ENTER_FASTRECOVERY(tp->t_flags); - if (tp->t_flags & TF_WASCRECOVERY) + tp->t_flags &= ~TF_WASFRECOVERY; + } + if (tp->t_flags & TF_WASCRECOVERY) { ENTER_CONGRECOVERY(tp->t_flags); + tp->t_flags &= ~TF_WASCRECOVERY; + } tp->snd_nxt = tp->snd_max; tp->t_badrxtwin = 0; break; @@ -1461,7 +1858,7 @@ rack_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type) static inline void -rack_cc_after_idle(struct tcpcb *tp, int reduce_largest) +rack_cc_after_idle(struct tcpcb *tp) { uint32_t i_cwnd; @@ -1475,29 +1872,11 @@ rack_cc_after_idle(struct tcpcb *tp, int reduce_largest) if (CC_ALGO(tp)->after_idle != NULL) CC_ALGO(tp)->after_idle(tp->ccv); - if (V_tcp_initcwnd_segments) - i_cwnd = min((V_tcp_initcwnd_segments * tp->t_maxseg), - max(2 * tp->t_maxseg, 14600)); - else if (V_tcp_do_rfc3390) - i_cwnd = min(4 * tp->t_maxseg, - max(2 * tp->t_maxseg, 4380)); - else { - /* Per RFC5681 Section 3.1 */ - if (tp->t_maxseg > 2190) - i_cwnd = 2 * tp->t_maxseg; - else if (tp->t_maxseg > 1095) - i_cwnd = 3 * tp->t_maxseg; - else - i_cwnd = 4 * tp->t_maxseg; - } - if (reduce_largest) { - /* - * Do we reduce the largest cwnd to make - * rack play nice on restart hptsi wise? - */ - if (((struct tcp_rack *)tp->t_fb_ptr)->r_ctl.rc_rack_largest_cwnd > i_cwnd) - ((struct tcp_rack *)tp->t_fb_ptr)->r_ctl.rc_rack_largest_cwnd = i_cwnd; - } + if (tp->snd_cwnd == 1) + i_cwnd = tp->t_maxseg; /* SYN(-ACK) lost */ + else + i_cwnd = tcp_compute_initwnd(tcp_maxseg(tp)); + /* * Being idle is no differnt than the initial window. If the cc * clamps it down below the initial window raise it to the initial @@ -1526,320 +1905,6 @@ rack_cc_after_idle(struct tcpcb *tp, int reduce_largest) (tlen <= tp->t_maxseg) && \ (tp->t_delayed_ack || (tp->t_flags & TF_NEEDSYN))) -static inline void -rack_calc_rwin(struct socket *so, struct tcpcb *tp) -{ - int32_t win; - - /* - * Calculate amount of space in receive window, and then do TCP - * input processing. Receive window is amount of space in rcv queue, - * but not less than advertised window. - */ - win = sbspace(&so->so_rcv); - if (win < 0) - win = 0; - tp->rcv_wnd = imax(win, (int)(tp->rcv_adv - tp->rcv_nxt)); -} - -static void -rack_do_drop(struct mbuf *m, struct tcpcb *tp) -{ - /* - * Drop space held by incoming segment and return. - */ - if (tp != NULL) - INP_WUNLOCK(tp->t_inpcb); - if (m) - m_freem(m); -} - -static void -rack_do_dropwithreset(struct mbuf *m, struct tcpcb *tp, struct tcphdr *th, int32_t rstreason, int32_t tlen) -{ - if (tp != NULL) { - tcp_dropwithreset(m, th, tp, tlen, rstreason); - INP_WUNLOCK(tp->t_inpcb); - } else - tcp_dropwithreset(m, th, NULL, tlen, rstreason); -} - -/* - * The value in ret_val informs the caller - * if we dropped the tcb (and lock) or not. - * 1 = we dropped it, 0 = the TCB is still locked - * and valid. - */ -static void -rack_do_dropafterack(struct mbuf *m, struct tcpcb *tp, struct tcphdr *th, int32_t thflags, int32_t tlen, int32_t * ret_val) -{ - /* - * Generate an ACK dropping incoming segment if it occupies sequence - * space, where the ACK reflects our state. - * - * We can now skip the test for the RST flag since all paths to this - * code happen after packets containing RST have been dropped. - * - * In the SYN-RECEIVED state, don't send an ACK unless the segment - * we received passes the SYN-RECEIVED ACK test. If it fails send a - * RST. This breaks the loop in the "LAND" DoS attack, and also - * prevents an ACK storm between two listening ports that have been - * sent forged SYN segments, each with the source address of the - * other. - */ - struct tcp_rack *rack; - - if (tp->t_state == TCPS_SYN_RECEIVED && (thflags & TH_ACK) && - (SEQ_GT(tp->snd_una, th->th_ack) || - SEQ_GT(th->th_ack, tp->snd_max))) { - *ret_val = 1; - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); - return; - } else - *ret_val = 0; - rack = (struct tcp_rack *)tp->t_fb_ptr; - rack->r_wanted_output++; - tp->t_flags |= TF_ACKNOW; - if (m) - m_freem(m); -} - - -static int -rack_process_rst(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp) -{ - /* - * RFC5961 Section 3.2 - * - * - RST drops connection only if SEG.SEQ == RCV.NXT. - If RST is in - * window, we send challenge ACK. - * - * Note: to take into account delayed ACKs, we should test against - * last_ack_sent instead of rcv_nxt. Note 2: we handle special case - * of closed window, not covered by the RFC. - */ - int dropped = 0; - - if ((SEQ_GEQ(th->th_seq, (tp->last_ack_sent - 1)) && - SEQ_LT(th->th_seq, tp->last_ack_sent + tp->rcv_wnd)) || - (tp->rcv_wnd == 0 && tp->last_ack_sent == th->th_seq)) { - - INP_INFO_RLOCK_ASSERT(&V_tcbinfo); - KASSERT(tp->t_state != TCPS_SYN_SENT, - ("%s: TH_RST for TCPS_SYN_SENT th %p tp %p", - __func__, th, tp)); - - if (V_tcp_insecure_rst || - (tp->last_ack_sent == th->th_seq) || - (tp->rcv_nxt == th->th_seq) || - ((tp->last_ack_sent - 1) == th->th_seq)) { - TCPSTAT_INC(tcps_drops); - /* Drop the connection. */ - switch (tp->t_state) { - case TCPS_SYN_RECEIVED: - so->so_error = ECONNREFUSED; - goto close; - case TCPS_ESTABLISHED: - case TCPS_FIN_WAIT_1: - case TCPS_FIN_WAIT_2: - case TCPS_CLOSE_WAIT: - case TCPS_CLOSING: - case TCPS_LAST_ACK: - so->so_error = ECONNRESET; - close: - tcp_state_change(tp, TCPS_CLOSED); - /* FALLTHROUGH */ - default: - tp = tcp_close(tp); - } - dropped = 1; - rack_do_drop(m, tp); - } else { - TCPSTAT_INC(tcps_badrst); - /* Send challenge ACK. */ - tcp_respond(tp, mtod(m, void *), th, m, - tp->rcv_nxt, tp->snd_nxt, TH_ACK); - tp->last_ack_sent = tp->rcv_nxt; - } - } else { - m_freem(m); - } - return (dropped); -} - -/* - * The value in ret_val informs the caller - * if we dropped the tcb (and lock) or not. - * 1 = we dropped it, 0 = the TCB is still locked - * and valid. - */ -static void -rack_challenge_ack(struct mbuf *m, struct tcphdr *th, struct tcpcb *tp, int32_t * ret_val) -{ - INP_INFO_RLOCK_ASSERT(&V_tcbinfo); - - TCPSTAT_INC(tcps_badsyn); - if (V_tcp_insecure_syn && - SEQ_GEQ(th->th_seq, tp->last_ack_sent) && - SEQ_LT(th->th_seq, tp->last_ack_sent + tp->rcv_wnd)) { - tp = tcp_drop(tp, ECONNRESET); - *ret_val = 1; - rack_do_drop(m, tp); - } else { - /* Send challenge ACK. */ - tcp_respond(tp, mtod(m, void *), th, m, tp->rcv_nxt, - tp->snd_nxt, TH_ACK); - tp->last_ack_sent = tp->rcv_nxt; - m = NULL; - *ret_val = 0; - rack_do_drop(m, NULL); - } -} - -/* - * rack_ts_check returns 1 for you should not proceed. It places - * in ret_val what should be returned 1/0 by the caller. The 1 indicates - * that the TCB is unlocked and probably dropped. The 0 indicates the - * TCB is still valid and locked. - */ -static int -rack_ts_check(struct mbuf *m, struct tcphdr *th, struct tcpcb *tp, int32_t tlen, int32_t thflags, int32_t * ret_val) -{ - - /* Check to see if ts_recent is over 24 days old. */ - if (tcp_ts_getticks() - tp->ts_recent_age > TCP_PAWS_IDLE) { - /* - * Invalidate ts_recent. If this segment updates ts_recent, - * the age will be reset later and ts_recent will get a - * valid value. If it does not, setting ts_recent to zero - * will at least satisfy the requirement that zero be placed - * in the timestamp echo reply when ts_recent isn't valid. - * The age isn't reset until we get a valid ts_recent - * because we don't want out-of-order segments to be dropped - * when ts_recent is old. - */ - tp->ts_recent = 0; - } else { - TCPSTAT_INC(tcps_rcvduppack); - TCPSTAT_ADD(tcps_rcvdupbyte, tlen); - TCPSTAT_INC(tcps_pawsdrop); - *ret_val = 0; - if (tlen) { - rack_do_dropafterack(m, tp, th, thflags, tlen, ret_val); - } else { - rack_do_drop(m, NULL); - } - return (1); - } - return (0); -} - -/* - * rack_drop_checks returns 1 for you should not proceed. It places - * in ret_val what should be returned 1/0 by the caller. The 1 indicates - * that the TCB is unlocked and probably dropped. The 0 indicates the - * TCB is still valid and locked. - */ -static int -rack_drop_checks(struct tcpopt *to, struct mbuf *m, struct tcphdr *th, struct tcpcb *tp, int32_t * tlenp, int32_t * thf, int32_t * drop_hdrlen, int32_t * ret_val) -{ - int32_t todrop; - int32_t thflags; - int32_t tlen; - - thflags = *thf; - tlen = *tlenp; - todrop = tp->rcv_nxt - th->th_seq; - if (todrop > 0) { - if (thflags & TH_SYN) { - thflags &= ~TH_SYN; - th->th_seq++; - if (th->th_urp > 1) - th->th_urp--; - else - thflags &= ~TH_URG; - todrop--; - } - /* - * Following if statement from Stevens, vol. 2, p. 960. - */ - if (todrop > tlen - || (todrop == tlen && (thflags & TH_FIN) == 0)) { - /* - * Any valid FIN must be to the left of the window. - * At this point the FIN must be a duplicate or out - * of sequence; drop it. - */ - thflags &= ~TH_FIN; - /* - * Send an ACK to resynchronize and drop any data. - * But keep on processing for RST or ACK. - */ - tp->t_flags |= TF_ACKNOW; - todrop = tlen; - TCPSTAT_INC(tcps_rcvduppack); - TCPSTAT_ADD(tcps_rcvdupbyte, todrop); - } else { - TCPSTAT_INC(tcps_rcvpartduppack); - TCPSTAT_ADD(tcps_rcvpartdupbyte, todrop); - } - if (tp->t_flags & TF_SACK_PERMIT) { - /* - * record the left, to-be-dropped edge of data - * here, for use as dsack block further down - */ - tcp_update_sack_list(tp, th->th_seq, - th->th_seq + todrop); - /* - * ACK now, as the next in-sequence segment - * will clear the DSACK block again - */ - tp->t_flags |= TF_ACKNOW; - } - *drop_hdrlen += todrop; /* drop from the top afterwards */ - th->th_seq += todrop; - tlen -= todrop; - if (th->th_urp > todrop) - th->th_urp -= todrop; - else { - thflags &= ~TH_URG; - th->th_urp = 0; - } - } - /* - * If segment ends after window, drop trailing data (and PUSH and - * FIN); if nothing left, just ACK. - */ - todrop = (th->th_seq + tlen) - (tp->rcv_nxt + tp->rcv_wnd); - if (todrop > 0) { - TCPSTAT_INC(tcps_rcvpackafterwin); - if (todrop >= tlen) { - TCPSTAT_ADD(tcps_rcvbyteafterwin, tlen); - /* - * If window is closed can only take segments at - * window edge, and have to drop data and PUSH from - * incoming segments. Continue processing, but - * remember to ack. Otherwise, drop segment and - * ack. - */ - if (tp->rcv_wnd == 0 && th->th_seq == tp->rcv_nxt) { - tp->t_flags |= TF_ACKNOW; - TCPSTAT_INC(tcps_rcvwinprobe); - } else { - rack_do_dropafterack(m, tp, th, thflags, tlen, ret_val); - return (1); - } - } else - TCPSTAT_ADD(tcps_rcvbyteafterwin, todrop); - m_adj(m, -todrop); - tlen -= todrop; - thflags &= ~(TH_PUSH | TH_FIN); - } - *thf = thflags; - *tlenp = tlen; - return (0); -} - static struct rack_sendmap * rack_find_lowest_rsm(struct tcp_rack *rack) { @@ -1872,7 +1937,7 @@ rack_find_high_nonack(struct tcp_rack *rack, struct rack_sendmap *rsm) */ counter_u64_add(rack_find_high, 1); prsm = rsm; - TAILQ_FOREACH_REVERSE_FROM(prsm, &rack->r_ctl.rc_map, rack_head, r_next) { + RB_FOREACH_REVERSE_FROM(prsm, rack_rb_tree_head, rsm) { if (prsm->r_flags & (RACK_ACKED | RACK_HAS_FIN)) { continue; } @@ -1944,7 +2009,6 @@ rack_calc_thresh_rack(struct tcp_rack *rack, uint32_t srtt, uint32_t cts) thresh += 1; } /* We don't let the rack timeout be above a RTO */ - if (thresh > TICKS_2_MSEC(rack->rc_tp->t_rxtcur)) { thresh = TICKS_2_MSEC(rack->rc_tp->t_rxtcur); } @@ -1971,7 +2035,7 @@ rack_calc_thresh_tlp(struct tcpcb *tp, struct tcp_rack *rack, thresh = (srtt * 2); /* Get the previous sent packet, if any */ - maxseg = tcp_maxseg(tp); + maxseg = ctf_fixed_maxseg(tp); counter_u64_add(rack_enter_tlp_calc, 1); len = rsm->r_end - rsm->r_start; if (rack->rack_tlp_threshold_use == TLP_USE_ID) { @@ -2044,6 +2108,24 @@ rack_calc_thresh_tlp(struct tcpcb *tp, struct tcp_rack *rack, return (thresh); } +static uint32_t +rack_grab_rtt(struct tcpcb *tp, struct tcp_rack *rack) +{ + /* + * We want the rack_rtt which is the + * last rtt we measured. However if that + * does not exist we fallback to the srtt (which + * we probably will never do) and then as a last + * resort we use RACK_INITIAL_RTO if no srtt is + * yet set. + */ + if (rack->rc_rack_rtt) + return(rack->rc_rack_rtt); + else if (tp->t_srtt == 0) + return(RACK_INITIAL_RTO); + return (TICKS_2_MSEC(tp->t_srtt >> TCP_RTT_SHIFT)); +} + static struct rack_sendmap * rack_check_recovery_mode(struct tcpcb *tp, uint32_t tsused) { @@ -2055,17 +2137,12 @@ rack_check_recovery_mode(struct tcpcb *tp, uint32_t tsused) struct tcp_rack *rack; struct rack_sendmap *rsm; int32_t idx; - uint32_t srtt_cur, srtt, thresh; + uint32_t srtt, thresh; rack = (struct tcp_rack *)tp->t_fb_ptr; - if (TAILQ_EMPTY(&rack->r_ctl.rc_map)) { + if (RB_EMPTY(&rack->r_ctl.rc_mtree)) { return (NULL); } - srtt_cur = tp->t_srtt >> TCP_RTT_SHIFT; - srtt = TICKS_2_MSEC(srtt_cur); - if (rack->rc_rack_rtt && (srtt > rack->rc_rack_rtt)) - srtt = rack->rc_rack_rtt; - rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap); if (rsm == NULL) return (NULL); @@ -2076,6 +2153,7 @@ rack_check_recovery_mode(struct tcpcb *tp, uint32_t tsused) return (NULL); } idx = rsm->r_rtr_cnt - 1; + srtt = rack_grab_rtt(tp, rack); thresh = rack_calc_thresh_rack(rack, srtt, tsused); if (tsused < rsm->r_tim_lastsent[idx]) { return (NULL); @@ -2100,7 +2178,7 @@ rack_get_persists_timer_val(struct tcpcb *tp, struct tcp_rack *rack) t = TICKS_2_MSEC((tp->t_srtt >> TCP_RTT_SHIFT) + ((tp->t_rttvar * 4) >> TCP_RTT_SHIFT)); TCPT_RANGESET(tt, t * tcp_backoff[tp->t_rxtshift], - tcp_persmin, tcp_persmax); + rack_persist_min, rack_persist_max); if (tp->t_rxtshift < TCP_MAXRXTSHIFT) tp->t_rxtshift++; rack->r_ctl.rc_hpts_flags |= PACE_TMR_PERSIT; @@ -2109,7 +2187,7 @@ rack_get_persists_timer_val(struct tcpcb *tp, struct tcp_rack *rack) } static uint32_t -rack_timer_start(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) +rack_timer_start(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, int sup_rack) { /* * Start the FR timer, we do this based on getting the first one in @@ -2117,7 +2195,7 @@ rack_timer_start(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) * events we need to stop the running timer (if its running) before * starting the new one. */ - uint32_t thresh, exp, to, srtt, time_since_sent; + uint32_t thresh, exp, to, srtt, time_since_sent, tstmp_touse; uint32_t srtt_cur; int32_t idx; int32_t is_tlp_timer = 0; @@ -2131,13 +2209,31 @@ rack_timer_start(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) /* We can't start any timer in persists */ return (rack_get_persists_timer_val(tp, rack)); } + if ((tp->t_state < TCPS_ESTABLISHED) || + ((tp->t_flags & TF_SACK_PERMIT) == 0)) + goto activate_rxt; rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap); - if (rsm == NULL) { + if ((rsm == NULL) || sup_rack) { /* Nothing on the send map */ activate_rxt: + time_since_sent = 0; + rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap); + if (rsm) { + idx = rsm->r_rtr_cnt - 1; + if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], rack->r_ctl.rc_tlp_rxt_last_time)) + tstmp_touse = rsm->r_tim_lastsent[idx]; + else + tstmp_touse = rack->r_ctl.rc_tlp_rxt_last_time; + if (TSTMP_GT(tstmp_touse, cts)) + time_since_sent = cts - tstmp_touse; + } if (SEQ_LT(tp->snd_una, tp->snd_max) || sbavail(&(tp->t_inpcb->inp_socket->so_snd))) { rack->r_ctl.rc_hpts_flags |= PACE_TMR_RXT; to = TICKS_2_MSEC(tp->t_rxtcur); + if (to > time_since_sent) + to -= time_since_sent; + else + to = rack->r_ctl.rc_min_to; if (to == 0) to = 1; return (to); @@ -2151,6 +2247,16 @@ activate_rxt: goto activate_rxt; } } + if (rack->sack_attack_disable) { + /* + * We don't want to do + * any TLP's if you are an attacker. + * Though if you are doing what + * is expected you may still have + * SACK-PASSED marks. + */ + goto activate_rxt; + } /* Convert from ms to usecs */ if (rsm->r_flags & RACK_SACK_PASSED) { if ((tp->t_flags & TF_SENTFIN) && @@ -2162,12 +2268,20 @@ activate_rxt: */ goto activate_rxt; } - if (tp->t_srtt) { - srtt_cur = (tp->t_srtt >> TCP_RTT_SHIFT); - srtt = TICKS_2_MSEC(srtt_cur); - } else - srtt = RACK_INITIAL_RTO; - + if ((rack->use_rack_cheat == 0) && + (IN_RECOVERY(tp->t_flags)) && + (rack->r_ctl.rc_prr_sndcnt < ctf_fixed_maxseg(tp))) { + /* + * We are not cheating, in recovery and + * not enough ack's to yet get our next + * retransmission out. + * + * Note that classified attackers do not + * get to use the rack-cheat. + */ + goto activate_tlp; + } + srtt = rack_grab_rtt(tp, rack); thresh = rack_calc_thresh_rack(rack, srtt, cts); idx = rsm->r_rtr_cnt - 1; exp = rsm->r_tim_lastsent[idx] + thresh; @@ -2181,6 +2295,7 @@ activate_rxt: } } else { /* Ok we need to do a TLP not RACK */ +activate_tlp: if ((rack->rc_tlp_in_progress != 0) || (rack->r_ctl.rc_tlp_rtx_out != 0)) { /* @@ -2189,12 +2304,6 @@ activate_rxt: */ goto activate_rxt; } - if ((tp->snd_max - tp->snd_una) > tp->snd_wnd) { - /* - * Peer collapsed rwnd, don't do TLP. - */ - goto activate_rxt; - } rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_tmap, rack_sendmap, r_tnext); if (rsm == NULL) { /* We found no rsm to TLP with. */ @@ -2206,10 +2315,13 @@ activate_rxt: goto activate_rxt; } idx = rsm->r_rtr_cnt - 1; - if (TSTMP_GT(cts, rsm->r_tim_lastsent[idx])) - time_since_sent = cts - rsm->r_tim_lastsent[idx]; - else - time_since_sent = 0; + time_since_sent = 0; + if (TSTMP_GEQ(rsm->r_tim_lastsent[idx], rack->r_ctl.rc_tlp_rxt_last_time)) + tstmp_touse = rsm->r_tim_lastsent[idx]; + else + tstmp_touse = rack->r_ctl.rc_tlp_rxt_last_time; + if (TSTMP_GT(tstmp_touse, cts)) + time_since_sent = cts - tstmp_touse; is_tlp_timer = 1; if (tp->t_srtt) { srtt_cur = (tp->t_srtt >> TCP_RTT_SHIFT); @@ -2260,10 +2372,6 @@ static void rack_enter_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) { if (rack->rc_in_persist == 0) { - if (((tp->t_flags & TF_SENTFIN) == 0) && - (tp->snd_max - tp->snd_una) >= sbavail(&rack->rc_inp->inp_socket->so_snd)) - /* Must need to send more data to enter persist */ - return; rack->r_ctl.rc_went_idle_time = cts; rack_timer_cancel(tp, rack, cts, __LINE__); tp->t_rxtshift = 0; @@ -2285,8 +2393,8 @@ rack_exit_persist(struct tcpcb *tp, struct tcp_rack *rack) } static void -rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts, int32_t line, - int32_t slot, uint32_t tot_len_this_send, int32_t frm_out_sbavail) +rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts, + int32_t slot, uint32_t tot_len_this_send, int sup_rack) { struct inpcb *inp; uint32_t delayed_ack = 0; @@ -2299,7 +2407,6 @@ rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts, int /* A previous call is already set up */ return; } - if ((tp->t_state == TCPS_CLOSED) || (tp->t_state == TCPS_LISTEN)) { return; @@ -2308,6 +2415,7 @@ rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts, int if (stopped && TSTMP_GT(rack->r_ctl.rc_timer_exp, cts)) { left = rack->r_ctl.rc_timer_exp - cts; } + rack->tlp_timer_up = 0; rack->r_ctl.rc_timer_exp = 0; if (rack->rc_inp->inp_in_hpts == 0) { rack->r_ctl.rc_hpts_flags = 0; @@ -2325,23 +2433,21 @@ rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts, int else slot = 1; } - if ((tp->snd_wnd == 0) && TCPS_HAVEESTABLISHED(tp->t_state)) { - /* No send window.. we must enter persist */ - rack_enter_persist(tp, rack, cts); - } else if ((frm_out_sbavail && - (frm_out_sbavail > (tp->snd_max - tp->snd_una)) && - (tp->snd_wnd < tp->t_maxseg)) && - TCPS_HAVEESTABLISHED(tp->t_state)) { + hpts_timeout = rack_timer_start(tp, rack, cts, sup_rack); + if (rack->sack_attack_disable && + (slot < USEC_TO_MSEC(tcp_sad_pacing_interval))) { /* - * If we have no window or we can't send a segment (and have - * data to send.. we cheat here and frm_out_sbavail is - * passed in with the sbavail(sb) only from bbr_output) and - * we are established, then we must enter persits (if not - * already in persits). + * We have a potential attacker on + * the line. We have possibly some + * (or now) pacing time set. We want to + * slow down the processing of sacks by some + * amount (if it is an attacker). Set the default + * slot for attackers in place (unless the orginal + * interval is longer). Its stored in + * micro-seconds, so lets convert to msecs. */ - rack_enter_persist(tp, rack, cts); + slot = USEC_TO_MSEC(tcp_sad_pacing_interval); } - hpts_timeout = rack_timer_start(tp, rack, cts); if (tp->t_flags & TF_DELACK) { delayed_ack = TICKS_2_MSEC(tcp_delacktime); rack->r_ctl.rc_hpts_flags |= PACE_TMR_DELACK; @@ -2398,6 +2504,11 @@ rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts, int rack->r_ctl.rc_timer_exp = cts + hpts_timeout; } if (slot) { + rack->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY; + if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK) + inp->inp_flags2 |= INP_DONT_SACK_QUEUE; + else + inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE; rack->r_ctl.rc_last_output_to = cts + slot; if ((hpts_timeout == 0) || (hpts_timeout > slot)) { if (rack->rc_inp->inp_in_hpts == 0) @@ -2413,6 +2524,15 @@ rack_start_hpts_timer(struct tcp_rack *rack, struct tcpcb *tp, uint32_t cts, int rack_log_to_start(rack, cts, hpts_timeout, slot, 0); } } else if (hpts_timeout) { + if (rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK) { + /* For a rack timer, don't wake us */ + rack->rc_inp->inp_flags2 |= INP_MBUF_QUEUE_READY; + inp->inp_flags2 |= INP_DONT_SACK_QUEUE; + } else { + /* All other timers wake us up */ + rack->rc_inp->inp_flags2 &= ~INP_MBUF_QUEUE_READY; + inp->inp_flags2 &= ~INP_DONT_SACK_QUEUE; + } if (rack->rc_inp->inp_in_hpts == 0) tcp_hpts_insert(tp->t_inpcb, HPTS_MS_TO_SLOTS(hpts_timeout)); rack_log_to_start(rack, cts, hpts_timeout, slot, 0); @@ -2448,7 +2568,7 @@ rack_timeout_rack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) * settings. */ struct rack_sendmap *rsm; - int32_t recovery; + int32_t recovery, ll; if (tp->t_timers->tt_flags & TT_STOPPED) { return (1); @@ -2457,12 +2577,16 @@ rack_timeout_rack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) /* Its not time yet */ return (0); } - rack_log_to_event(rack, RACK_TO_FRM_RACK); recovery = IN_RECOVERY(tp->t_flags); counter_u64_add(rack_to_tot, 1); if (rack->r_state && (rack->r_state != tp->t_state)) rack_set_state(tp, rack); rsm = rack_check_recovery_mode(tp, cts); + if (rsm) + ll = rsm->r_end - rsm->r_start; + else + ll = 0; + rack_log_to_event(rack, RACK_TO_FRM_RACK, ll); if (rsm) { uint32_t rtt; @@ -2470,23 +2594,23 @@ rack_timeout_rack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) if (rtt == 0) rtt = 1; if ((recovery == 0) && - (rack->r_ctl.rc_prr_sndcnt < tp->t_maxseg)) { + (rack->r_ctl.rc_prr_sndcnt < ctf_fixed_maxseg(tp))) { /* * The rack-timeout that enter's us into recovery * will force out one MSS and set us up so that we * can do one more send in 2*rtt (transitioning the * rack timeout into a rack-tlp). */ - rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg; - } else if ((rack->r_ctl.rc_prr_sndcnt < tp->t_maxseg) && - ((rsm->r_end - rsm->r_start) > rack->r_ctl.rc_prr_sndcnt)) { + rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp); + rack_log_to_prr(rack, 3); + } else if ((rack->r_ctl.rc_prr_sndcnt < (rsm->r_end - rsm->r_start)) && + rack->use_rack_cheat) { /* - * When a rack timer goes, we have to send at - * least one segment. They will be paced a min of 1ms - * apart via the next rack timer (or further - * if the rack timer dictates it). + * When a rack timer goes, if the rack cheat is + * on, arrange it so we can send a full segment. */ - rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg; + rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp); + rack_log_to_prr(rack, 4); } } else { /* This is a case that should happen rarely if ever */ @@ -2500,6 +2624,24 @@ rack_timeout_rack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) return (0); } +static __inline void +rack_clone_rsm(struct tcp_rack *rack, struct rack_sendmap *nrsm, + struct rack_sendmap *rsm, uint32_t start) +{ + int idx; + + nrsm->r_start = start; + nrsm->r_end = rsm->r_end; + nrsm->r_rtr_cnt = rsm->r_rtr_cnt; + nrsm->r_flags = rsm->r_flags; + nrsm->r_dupack = rsm->r_dupack; + nrsm->r_rtr_bytes = 0; + rsm->r_end = nrsm->r_start; + for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { + nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; + } +} + static struct rack_sendmap * rack_merge_rsm(struct tcp_rack *rack, struct rack_sendmap *l_rsm, @@ -2515,19 +2657,32 @@ rack_merge_rsm(struct tcp_rack *rack, * is any reason we need to try to find * the oldest (or last oldest retransmitted). */ + struct rack_sendmap *rm; + l_rsm->r_end = r_rsm->r_end; + if (l_rsm->r_dupack < r_rsm->r_dupack) + l_rsm->r_dupack = r_rsm->r_dupack; if (r_rsm->r_rtr_bytes) l_rsm->r_rtr_bytes += r_rsm->r_rtr_bytes; if (r_rsm->r_in_tmap) { /* This really should not happen */ TAILQ_REMOVE(&rack->r_ctl.rc_tmap, r_rsm, r_tnext); + r_rsm->r_in_tmap = 0; } /* Now the flags */ if (r_rsm->r_flags & RACK_HAS_FIN) l_rsm->r_flags |= RACK_HAS_FIN; if (r_rsm->r_flags & RACK_TLP) l_rsm->r_flags |= RACK_TLP; - TAILQ_REMOVE(&rack->r_ctl.rc_map, r_rsm, r_next); + if (r_rsm->r_flags & RACK_RWND_COLLAPSED) + l_rsm->r_flags |= RACK_RWND_COLLAPSED; + rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, r_rsm); +#ifdef INVARIANTS + if (rm != r_rsm) { + panic("removing head in rack:%p rsm:%p rm:%p", + rack, r_rsm, rm); + } +#endif if ((r_rsm->r_limit_type == 0) && (l_rsm->r_limit_type != 0)) { /* Transfer the split limit to the map we free */ r_rsm->r_limit_type = l_rsm->r_limit_type; @@ -2552,9 +2707,11 @@ rack_timeout_tlp(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) * Tail Loss Probe. */ struct rack_sendmap *rsm = NULL; + struct rack_sendmap *insret; struct socket *so; uint32_t amm, old_prr_snd = 0; uint32_t out, avail; + int collapsed_win = 0; if (tp->t_timers->tt_flags & TT_STOPPED) { return (1); @@ -2571,14 +2728,28 @@ rack_timeout_tlp(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) * A TLP timer has expired. We have been idle for 2 rtts. So we now * need to figure out how to force a full MSS segment out. */ - rack_log_to_event(rack, RACK_TO_FRM_TLP); + rack_log_to_event(rack, RACK_TO_FRM_TLP, 0); counter_u64_add(rack_tlp_tot, 1); if (rack->r_state && (rack->r_state != tp->t_state)) rack_set_state(tp, rack); so = tp->t_inpcb->inp_socket; +#ifdef KERN_TLS + if (rack->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) { + /* + * For hardware TLS we do *not* want to send + * new data, lets instead just do a retransmission. + */ + goto need_retran; + } +#endif avail = sbavail(&so->so_snd); out = tp->snd_max - tp->snd_una; - rack->rc_timer_up = 1; + rack->tlp_timer_up = 1; + if (out > tp->snd_wnd) { + /* special case, we need a retransmission */ + collapsed_win = 1; + goto need_retran; + } /* * If we are in recovery we can jazz out a segment if new data is * present simply by setting rc_prr_sndcnt to a segment. @@ -2587,18 +2758,19 @@ rack_timeout_tlp(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) ((rack_always_send_oldest == 0) || (TAILQ_EMPTY(&rack->r_ctl.rc_tmap)))) { /* New data is available */ amm = avail - out; - if (amm > tp->t_maxseg) { - amm = tp->t_maxseg; - } else if ((amm < tp->t_maxseg) && ((tp->t_flags & TF_NODELAY) == 0)) { + if (amm > ctf_fixed_maxseg(tp)) { + amm = ctf_fixed_maxseg(tp); + } else if ((amm < ctf_fixed_maxseg(tp)) && ((tp->t_flags & TF_NODELAY) == 0)) { /* not enough to fill a MTU and no-delay is off */ goto need_retran; } if (IN_RECOVERY(tp->t_flags)) { /* Unlikely */ old_prr_snd = rack->r_ctl.rc_prr_sndcnt; - if (out + amm <= tp->snd_wnd) + if (out + amm <= tp->snd_wnd) { rack->r_ctl.rc_prr_sndcnt = amm; - else + rack_log_to_prr(rack, 4); + } else goto need_retran; } else { /* Set the send-new override */ @@ -2618,28 +2790,52 @@ need_retran: * Ok we need to arrange the last un-acked segment to be re-sent, or * optionally the first un-acked segment. */ - if (rack_always_send_oldest) - rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap); - else { - rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_map, rack_sendmap, r_next); - if (rsm && (rsm->r_flags & (RACK_ACKED | RACK_HAS_FIN))) { - rsm = rack_find_high_nonack(rack, rsm); + if (collapsed_win == 0) { + if (rack_always_send_oldest) + rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap); + else { + rsm = RB_MAX(rack_rb_tree_head, &rack->r_ctl.rc_mtree); + if (rsm && (rsm->r_flags & (RACK_ACKED | RACK_HAS_FIN))) { + rsm = rack_find_high_nonack(rack, rsm); + } } - } - if (rsm == NULL) { - counter_u64_add(rack_tlp_does_nada, 1); + if (rsm == NULL) { + counter_u64_add(rack_tlp_does_nada, 1); #ifdef TCP_BLACKBOX - tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true); + tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true); #endif - goto out; + goto out; + } + } else { + /* + * We must find the last segment + * that was acceptable by the client. + */ + RB_FOREACH_REVERSE(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) { + if ((rsm->r_flags & RACK_RWND_COLLAPSED) == 0) { + /* Found one */ + break; + } + } + if (rsm == NULL) { + /* None? if so send the first */ + rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree); + if (rsm == NULL) { + counter_u64_add(rack_tlp_does_nada, 1); +#ifdef TCP_BLACKBOX + tcp_log_dump_tp_logbuf(tp, "nada counter trips", M_NOWAIT, true); +#endif + goto out; + } + } } - if ((rsm->r_end - rsm->r_start) > tp->t_maxseg) { + if ((rsm->r_end - rsm->r_start) > ctf_fixed_maxseg(tp)) { /* * We need to split this the last segment in two. */ - int32_t idx; struct rack_sendmap *nrsm; + nrsm = rack_alloc_full_limit(rack); if (nrsm == NULL) { /* @@ -2649,17 +2845,15 @@ need_retran: counter_u64_add(rack_tlp_does_nada, 1); goto out; } - nrsm->r_start = (rsm->r_end - tp->t_maxseg); - nrsm->r_end = rsm->r_end; - nrsm->r_rtr_cnt = rsm->r_rtr_cnt; - nrsm->r_flags = rsm->r_flags; - nrsm->r_sndcnt = rsm->r_sndcnt; - nrsm->r_rtr_bytes = 0; - rsm->r_end = nrsm->r_start; - for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { - nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; - } - TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next); + rack_clone_rsm(rack, nrsm, rsm, + (rsm->r_end - ctf_fixed_maxseg(tp))); + insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm); +#ifdef INVARIANTS + if (insret != NULL) { + panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p", + nrsm, insret, rack, rsm); + } +#endif if (rsm->r_in_tmap) { TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext); nrsm->r_in_tmap = 1; @@ -2684,11 +2878,12 @@ send: * peer in max times. We need the retransmit timer to take * over. */ -restore: + restore: rack->r_ctl.rc_tlpsend = NULL; if (rsm) rsm->r_flags &= ~RACK_TLP; rack->r_ctl.rc_prr_sndcnt = old_prr_snd; + rack_log_to_prr(rack, 5); counter_u64_add(rack_tlp_retran_fail, 1); goto out; } else if (rsm) { @@ -2708,7 +2903,7 @@ restore: rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP; return (0); out: - rack->rc_timer_up = 0; + rack->tlp_timer_up = 0; rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_TLP; return (0); } @@ -2727,7 +2922,7 @@ rack_timeout_delack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) if (tp->t_timers->tt_flags & TT_STOPPED) { return (1); } - rack_log_to_event(rack, RACK_TO_FRM_DELACK); + rack_log_to_event(rack, RACK_TO_FRM_DELACK, 0); tp->t_flags &= ~TF_DELACK; tp->t_flags |= TF_ACKNOW; TCPSTAT_INC(tcps_delack); @@ -2746,8 +2941,9 @@ rack_timeout_delack(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) static int rack_timeout_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) { + struct tcptemp *t_template; struct inpcb *inp; - int32_t retval = 0; + int32_t retval = 1; inp = tp->t_inpcb; @@ -2795,9 +2991,22 @@ rack_timeout_persist(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) tcp_set_inp_to_drop(rack->rc_inp, ETIMEDOUT); goto out; } - tp->t_flags |= TF_FORCEDATA; + t_template = tcpip_maketemplate(rack->rc_inp); + if (t_template) { + tcp_respond(tp, t_template->tt_ipgen, + &t_template->tt_t, (struct mbuf *)NULL, + tp->rcv_nxt, tp->snd_una - 1, 0); + /* This sends an ack */ + if (tp->t_flags & TF_DELACK) + tp->t_flags &= ~TF_DELACK; + free(t_template, M_TEMP); + } + if (tp->t_rxtshift < TCP_MAXRXTSHIFT) + tp->t_rxtshift++; out: - rack_log_to_event(rack, RACK_TO_FRM_PERSIST); + rack_log_to_event(rack, RACK_TO_FRM_PERSIST, 0); + rack_start_hpts_timer(rack, tp, cts, + 0, 0, 0); return (retval); } @@ -2818,7 +3027,7 @@ rack_timeout_keepalive(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) } rack->r_ctl.rc_hpts_flags &= ~PACE_TMR_KEEP; inp = tp->t_inpcb; - rack_log_to_event(rack, RACK_TO_FRM_KEEP); + rack_log_to_event(rack, RACK_TO_FRM_KEEP, 0); /* * Keep-alive timer went off; send something or drop connection if * idle for too long. @@ -2849,7 +3058,7 @@ rack_timeout_keepalive(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) free(t_template, M_TEMP); } } - rack_start_hpts_timer(rack, tp, cts, __LINE__, 0, 0, 0); + rack_start_hpts_timer(rack, tp, cts, 0, 0, 0); return (1); dropit: TCPSTAT_INC(tcps_keepdrops); @@ -2874,7 +3083,7 @@ rack_remxt_tmr(struct tcpcb *tp) rack = (struct tcp_rack *)tp->t_fb_ptr; rack_timer_cancel(tp, rack, tcp_ts_getticks(), __LINE__); - rack_log_to_event(rack, RACK_TO_FRM_TMR); + rack_log_to_event(rack, RACK_TO_FRM_TMR, 0); if (rack->r_state && (rack->r_state != tp->t_state)) rack_set_state(tp, rack); /* @@ -2885,10 +3094,11 @@ rack_remxt_tmr(struct tcpcb *tp) * so for now we will just let the normal rxt timer * and tlp timer take care of it. */ - TAILQ_FOREACH(rsm, &rack->r_ctl.rc_map, r_next) { + RB_FOREACH(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) { if (rsm->r_flags & RACK_ACKED) { cnt++; - rsm->r_sndcnt = 0; + rsm->r_dupack = 0; + rack_log_retran_reason(rack, rsm, __LINE__, 0, 2); if (rsm->r_in_tmap == 0) { /* We must re-add it back to the tlist */ if (trsm == NULL) { @@ -2897,9 +3107,9 @@ rack_remxt_tmr(struct tcpcb *tp) TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, trsm, rsm, r_tnext); } rsm->r_in_tmap = 1; - trsm = rsm; } } + trsm = rsm; rsm->r_flags &= ~(RACK_ACKED | RACK_SACK_PASSED | RACK_WAS_SACKPASS); } /* Clear the count (we just un-acked them) */ @@ -2907,10 +3117,9 @@ rack_remxt_tmr(struct tcpcb *tp) /* Clear the tlp rtx mark */ rack->r_ctl.rc_tlp_rtx_out = 0; rack->r_ctl.rc_tlp_seg_send_cnt = 0; - rack->r_ctl.rc_resend = TAILQ_FIRST(&rack->r_ctl.rc_map); - /* Setup so we send one segment */ - if (rack->r_ctl.rc_prr_sndcnt < tp->t_maxseg) - rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg; + rack->r_ctl.rc_resend = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree); + rack->r_ctl.rc_prr_sndcnt = 0; + rack_log_to_prr(rack, 6); rack->r_timer_override = 1; } @@ -2944,7 +3153,18 @@ rack_timeout_rxt(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) * retransmit interval. Back off to a longer retransmit interval * and retransmit one segment. */ - if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) { + rack_remxt_tmr(tp); + if ((rack->r_ctl.rc_resend == NULL) || + ((rack->r_ctl.rc_resend->r_flags & RACK_RWND_COLLAPSED) == 0)) { + /* + * If the rwnd collapsed on + * the one we are retransmitting + * it does not count against the + * rxt count. + */ + tp->t_rxtshift++; + } + if (tp->t_rxtshift > TCP_MAXRXTSHIFT) { tp->t_rxtshift = TCP_MAXRXTSHIFT; TCPSTAT_INC(tcps_timeoutdrop); retval = 1; @@ -2952,7 +3172,6 @@ rack_timeout_rxt(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) (tp->t_softerror ? (uint16_t) tp->t_softerror : ETIMEDOUT)); goto out; } - rack_remxt_tmr(tp); if (tp->t_state == TCPS_SYN_SENT) { /* * If the SYN was retransmitted, indicate CWND to be limited @@ -2987,7 +3206,7 @@ rack_timeout_rxt(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) TCPSTAT_INC(tcps_rexmttimeo); if ((tp->t_state == TCPS_SYN_SENT) || (tp->t_state == TCPS_SYN_RECEIVED)) - rexmt = MSEC_2_TICKS(RACK_INITIAL_RTO * tcp_syn_backoff[tp->t_rxtshift]); + rexmt = MSEC_2_TICKS(RACK_INITIAL_RTO * tcp_backoff[tp->t_rxtshift]); else rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift]; TCPT_RANGESET(tp->t_rxtcur, rexmt, @@ -3089,16 +3308,6 @@ rack_timeout_rxt(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts) } } /* - * Disable RFC1323 and SACK if we haven't got any response to our - * third SYN to work-around some broken terminal servers (most of - * which have hopefully been retired) that have bad VJ header - * compression code which trashes TCP segments containing - * unknown-to-them TCP options. - */ - if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) && - (tp->t_rxtshift == 3)) - tp->t_flags &= ~(TF_REQ_SCALE | TF_REQ_TSTMP | TF_SACK_PERMIT); - /* * If we backed off this far, our srtt estimate is probably bogus. * Clobber it so we'll take the next rtt measurement as our srtt; * move the current srtt into rttvar to keep the current retransmit @@ -3168,10 +3377,13 @@ rack_process_timers(struct tcpcb *tp, struct tcp_rack *rack, uint32_t cts, uint8 if (timers & PACE_TMR_DELACK) { ret = rack_timeout_delack(tp, rack, cts); } else if (timers & PACE_TMR_RACK) { + rack->r_ctl.rc_tlp_rxt_last_time = cts; ret = rack_timeout_rack(tp, rack, cts); } else if (timers & PACE_TMR_TLP) { + rack->r_ctl.rc_tlp_rxt_last_time = cts; ret = rack_timeout_tlp(tp, rack, cts); } else if (timers & PACE_TMR_RXT) { + rack->r_ctl.rc_tlp_rxt_last_time = cts; ret = rack_timeout_rxt(tp, rack, cts); } else if (timers & PACE_TMR_PERSIT) { ret = rack_timeout_persist(tp, rack, cts); @@ -3262,7 +3474,8 @@ rack_update_rsm(struct tcpcb *tp, struct tcp_rack *rack, int32_t idx; rsm->r_rtr_cnt++; - rsm->r_sndcnt++; + rack_log_retran_reason(rack, rsm, __LINE__, 0, 2); + rsm->r_dupack = 0; if (rsm->r_rtr_cnt > RACK_NUM_OF_RETRANS) { rsm->r_rtr_cnt = RACK_NUM_OF_RETRANS; rsm->r_flags |= RACK_OVERMAX; @@ -3280,6 +3493,7 @@ rack_update_rsm(struct tcpcb *tp, struct tcp_rack *rack, } if (rsm->r_in_tmap) { TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 0; } TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext); rsm->r_in_tmap = 1; @@ -3288,23 +3502,20 @@ rack_update_rsm(struct tcpcb *tp, struct tcp_rack *rack, rsm->r_flags &= ~RACK_SACK_PASSED; rsm->r_flags |= RACK_WAS_SACKPASS; } - /* Update memory for next rtr */ - rack->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); } static uint32_t rack_update_entry(struct tcpcb *tp, struct tcp_rack *rack, - struct rack_sendmap *rsm, uint32_t ts, int32_t * lenp) + struct rack_sendmap *rsm, uint32_t ts, int32_t *lenp) { /* * We (re-)transmitted starting at rsm->r_start for some length * (possibly less than r_end. */ - struct rack_sendmap *nrsm; + struct rack_sendmap *nrsm, *insret; uint32_t c_end; int32_t len; - int32_t idx; len = *lenp; c_end = rsm->r_start + len; @@ -3346,17 +3557,16 @@ rack_update_entry(struct tcpcb *tp, struct tcp_rack *rack, * we retransmitted 5 bytes i.e. 1, 5. The original piece shrinks to * 1, 6 and the new piece will be 6, 11. */ - nrsm->r_start = c_end; - nrsm->r_end = rsm->r_end; - nrsm->r_rtr_cnt = rsm->r_rtr_cnt; - nrsm->r_flags = rsm->r_flags; - nrsm->r_sndcnt = rsm->r_sndcnt; - nrsm->r_rtr_bytes = 0; - rsm->r_end = c_end; - for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { - nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; + rack_clone_rsm(rack, nrsm, rsm, c_end); + nrsm->r_dupack = 0; + rack_log_retran_reason(rack, nrsm, __LINE__, 0, 2); + insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm); +#ifdef INVARIANTS + if (insret != NULL) { + panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p", + nrsm, insret, rack, rsm); } - TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next); +#endif if (rsm->r_in_tmap) { TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext); nrsm->r_in_tmap = 1; @@ -3374,9 +3584,8 @@ rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len, uint8_t pass, struct rack_sendmap *hintrsm) { struct tcp_rack *rack; - struct rack_sendmap *rsm, *nrsm; + struct rack_sendmap *rsm, *nrsm, *insret, fe; register uint32_t snd_max, snd_una; - int32_t idx; /* * Add to the RACK log of packets in flight or retransmitted. If @@ -3426,7 +3635,10 @@ rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len, end = seq_out + len; seq_out = snd_una; - len = end - seq_out; + if (SEQ_GEQ(end, seq_out)) + len = end - seq_out; + else + len = 0; } snd_max = tp->snd_max; if (th_flags & (TH_SYN | TH_FIN)) { @@ -3456,8 +3668,9 @@ rack_log_output(struct tcpcb *tp, struct tcpopt *to, int32_t len, if (IN_RECOVERY(tp->t_flags)) { rack->r_ctl.rc_prr_out += len; } - /* First question is it a retransmission? */ + /* First question is it a retransmission or new? */ if (seq_out == snd_max) { + /* Its new */ again: rsm = rack_alloc(rack); if (rsm == NULL) { @@ -3475,10 +3688,24 @@ again: rsm->r_tim_lastsent[0] = ts; rsm->r_rtr_cnt = 1; rsm->r_rtr_bytes = 0; - rsm->r_start = seq_out; - rsm->r_end = rsm->r_start + len; - rsm->r_sndcnt = 0; - TAILQ_INSERT_TAIL(&rack->r_ctl.rc_map, rsm, r_next); + if (th_flags & TH_SYN) { + /* The data space is one beyond snd_una */ + rsm->r_start = seq_out + 1; + rsm->r_end = rsm->r_start + (len - 1); + } else { + /* Normal case */ + rsm->r_start = seq_out; + rsm->r_end = rsm->r_start + len; + } + rsm->r_dupack = 0; + rack_log_retran_reason(rack, rsm, __LINE__, 0, 2); + insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); +#ifdef INVARIANTS + if (insret != NULL) { + panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p", + nrsm, insret, rack, rsm); + } +#endif TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext); rsm->r_in_tmap = 1; return; @@ -3486,22 +3713,16 @@ again: /* * If we reach here its a retransmission and we need to find it. */ + memset(&fe, 0, sizeof(fe)); more: if (hintrsm && (hintrsm->r_start == seq_out)) { rsm = hintrsm; hintrsm = NULL; - } else if (rack->r_ctl.rc_next) { - /* We have a hint from a previous run */ - rsm = rack->r_ctl.rc_next; } else { /* No hints sorry */ rsm = NULL; } if ((rsm) && (rsm->r_start == seq_out)) { - /* - * We used rc_next or hintrsm to retransmit, hopefully the - * likely case. - */ seq_out = rack_update_entry(tp, rack, rsm, ts, &len); if (len == 0) { return; @@ -3510,14 +3731,16 @@ more: } } /* Ok it was not the last pointer go through it the hard way. */ - TAILQ_FOREACH(rsm, &rack->r_ctl.rc_map, r_next) { +refind: + fe.r_start = seq_out; + rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe); + if (rsm) { if (rsm->r_start == seq_out) { seq_out = rack_update_entry(tp, rack, rsm, ts, &len); - rack->r_ctl.rc_next = TAILQ_NEXT(rsm, r_next); if (len == 0) { return; } else { - continue; + goto refind; } } if (SEQ_GEQ(seq_out, rsm->r_start) && SEQ_LT(seq_out, rsm->r_end)) { @@ -3535,17 +3758,14 @@ more: * copy rsm to nrsm and then trim the front of rsm * to not include this part. */ - nrsm->r_start = seq_out; - nrsm->r_end = rsm->r_end; - nrsm->r_rtr_cnt = rsm->r_rtr_cnt; - nrsm->r_flags = rsm->r_flags; - nrsm->r_sndcnt = rsm->r_sndcnt; - nrsm->r_rtr_bytes = 0; - for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { - nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; + rack_clone_rsm(rack, nrsm, rsm, seq_out); + insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm); +#ifdef INVARIANTS + if (insret != NULL) { + panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p", + nrsm, insret, rack, rsm); } - rsm->r_end = nrsm->r_start; - TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next); +#endif if (rsm->r_in_tmap) { TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext); nrsm->r_in_tmap = 1; @@ -3568,7 +3788,7 @@ more: printf("seq_out:%u len:%d snd_una:%u snd_max:%u -- but rsm not found?\n", seq_out, len, tp->snd_una, tp->snd_max); printf("Starting Dump of all rack entries\n"); - TAILQ_FOREACH(rsm, &rack->r_ctl.rc_map, r_next) { + RB_FOREACH(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) { printf("rsm:%p start:%u end:%u\n", rsm, rsm->r_start, rsm->r_end); } @@ -3799,7 +4019,7 @@ rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack, rack->r_ctl.rc_rack_min_rtt = 1; } } - tcp_rack_xmit_timer(rack, TCP_TS_TO_TICKS(t) + 1); + tcp_rack_xmit_timer(rack, t + 1); if ((rsm->r_flags & RACK_TLP) && (!IN_RECOVERY(tp->t_flags))) { /* Segment was a TLP and our retrans matched */ @@ -3812,9 +4032,9 @@ rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack, * When we enter recovery we need to assure * we send one packet. */ - rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg; - } else - rack->r_ctl.rc_tlp_rtx_out = 0; + rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp); + rack_log_to_prr(rack, 7); + } } if (SEQ_LT(rack->r_ctl.rc_rack_tmit_time, rsm->r_tim_lastsent[(rsm->r_rtr_cnt - 1)])) { /* New more recent rack_tmit_time */ @@ -3833,7 +4053,7 @@ rack_update_rtt(struct tcpcb *tp, struct tcp_rack *rack, if ((to->to_flags & TOF_TS) && (ack_type == CUM_ACKED) && (to->to_tsecr) && - ((rsm->r_flags & (RACK_DEFERRED | RACK_OVERMAX)) == 0)) { + ((rsm->r_flags & RACK_OVERMAX) == 0)) { /* * Now which timestamp does it match? In this block the ACK * must be coming from a previous transmission. @@ -3930,11 +4150,7 @@ rack_log_sack_passed(struct tcpcb *tp, struct tcp_rack *rack, struct rack_sendmap *rsm) { struct rack_sendmap *nrsm; - uint32_t ts; - int32_t idx; - idx = rsm->r_rtr_cnt - 1; - ts = rsm->r_tim_lastsent[idx]; nrsm = rsm; TAILQ_FOREACH_REVERSE_FROM(nrsm, &rack->r_ctl.rc_tmap, rack_head, r_tnext) { @@ -3943,7 +4159,11 @@ rack_log_sack_passed(struct tcpcb *tp, continue; } if (nrsm->r_flags & RACK_ACKED) { - /* Skip ack'd segments */ + /* + * Skip ack'd segments, though we + * should not see these, since tmap + * should not have ack'd segments. + */ continue; } if (nrsm->r_flags & RACK_SACK_PASSED) { @@ -3954,146 +4174,219 @@ rack_log_sack_passed(struct tcpcb *tp, */ break; } - idx = nrsm->r_rtr_cnt - 1; - if (ts == nrsm->r_tim_lastsent[idx]) { - /* - * For this case lets use seq no, if we sent in a - * big block (TSO) we would have a bunch of segments - * sent at the same time. - * - * We would only get a report if its SEQ is earlier. - * If we have done multiple retransmits the times - * would not be equal. - */ - if (SEQ_LT(nrsm->r_start, rsm->r_start)) { - nrsm->r_flags |= RACK_SACK_PASSED; - nrsm->r_flags &= ~RACK_WAS_SACKPASS; - } - } else { - /* - * Here they were sent at different times, not a big - * block. Since we transmitted this one later and - * see it sack'd then this must also be missing (or - * we would have gotten a sack block for it) - */ - nrsm->r_flags |= RACK_SACK_PASSED; - nrsm->r_flags &= ~RACK_WAS_SACKPASS; - } + nrsm->r_flags |= RACK_SACK_PASSED; + nrsm->r_flags &= ~RACK_WAS_SACKPASS; } } static uint32_t rack_proc_sack_blk(struct tcpcb *tp, struct tcp_rack *rack, struct sackblk *sack, - struct tcpopt *to, struct rack_sendmap **prsm, uint32_t cts) + struct tcpopt *to, struct rack_sendmap **prsm, uint32_t cts, int *moved_two) { - int32_t idx; - int32_t times = 0; uint32_t start, end, changed = 0; - struct rack_sendmap *rsm, *nrsm; + struct rack_sendmap stack_map; + struct rack_sendmap *rsm, *nrsm, fe, *insret, *prev, *next; int32_t used_ref = 1; + int moved = 0; start = sack->start; end = sack->end; rsm = *prsm; - if (rsm && SEQ_LT(start, rsm->r_start)) { - TAILQ_FOREACH_REVERSE_FROM(rsm, &rack->r_ctl.rc_map, rack_head, r_next) { - if (SEQ_GEQ(start, rsm->r_start) && - SEQ_LT(start, rsm->r_end)) { - goto do_rest_ofb; - } - } - } - if (rsm == NULL) { -start_at_beginning: - rsm = NULL; + memset(&fe, 0, sizeof(fe)); +do_rest_ofb: + if ((rsm == NULL) || + (SEQ_LT(end, rsm->r_start)) || + (SEQ_GEQ(start, rsm->r_end)) || + (SEQ_LT(start, rsm->r_start))) { + /* + * We are not in the right spot, + * find the correct spot in the tree. + */ used_ref = 0; + fe.r_start = start; + rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe); + moved++; } - /* First lets locate the block where this guy is */ - TAILQ_FOREACH_FROM(rsm, &rack->r_ctl.rc_map, r_next) { - if (SEQ_GEQ(start, rsm->r_start) && - SEQ_LT(start, rsm->r_end)) { - break; - } - } -do_rest_ofb: if (rsm == NULL) { - /* - * This happens when we get duplicate sack blocks with the - * same end. For example SACK 4: 100 SACK 3: 100 The sort - * will not change there location so we would just start at - * the end of the first one and get lost. - */ - if (tp->t_flags & TF_SENTFIN) { - /* - * Check to see if we have not logged the FIN that - * went out. + /* TSNH */ + goto out; + } + /* Ok we have an ACK for some piece of this rsm */ + if (rsm->r_start != start) { + if ((rsm->r_flags & RACK_ACKED) == 0) { + /** + * Need to split this in two pieces the before and after, + * the before remains in the map, the after must be + * added. In other words we have: + * rsm |--------------| + * sackblk |-------> + * rsm will become + * rsm |---| + * and nrsm will be the sacked piece + * nrsm |----------| + * + * But before we start down that path lets + * see if the sack spans over on top of + * the next guy and it is already sacked. */ - nrsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_map, rack_sendmap, r_next); - if (nrsm && (nrsm->r_end + 1) == tp->snd_max) { - /* - * Ok we did not get the FIN logged. + next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + if (next && (next->r_flags & RACK_ACKED) && + SEQ_GEQ(end, next->r_start)) { + /** + * So the next one is already acked, and + * we can thus by hookery use our stack_map + * to reflect the piece being sacked and + * then adjust the two tree entries moving + * the start and ends around. So we start like: + * rsm |------------| (not-acked) + * next |-----------| (acked) + * sackblk |--------> + * We want to end like so: + * rsm |------| (not-acked) + * next |-----------------| (acked) + * nrsm |-----| + * Where nrsm is a temporary stack piece we + * use to update all the gizmos. */ - nrsm->r_end++; - rsm = nrsm; - goto do_rest_ofb; - } - } - if (times == 1) { + /* Copy up our fudge block */ + nrsm = &stack_map; + memcpy(nrsm, rsm, sizeof(struct rack_sendmap)); + /* Now adjust our tree blocks */ + rsm->r_end = start; + next->r_start = start; + /* Clear out the dup ack count of the remainder */ + rsm->r_dupack = 0; + rack_log_retran_reason(rack, rsm, __LINE__, 0, 2); + /* Now lets make sure our fudge block is right */ + nrsm->r_start = start; + /* Now lets update all the stats and such */ + rack_update_rtt(tp, rack, nrsm, to, cts, SACKED); + changed += (nrsm->r_end - nrsm->r_start); + rack->r_ctl.rc_sacked += (nrsm->r_end - nrsm->r_start); + if (nrsm->r_flags & RACK_SACK_PASSED) { + counter_u64_add(rack_reorder_seen, 1); + rack->r_ctl.rc_reorder_ts = cts; + } + /* + * Now we want to go up from rsm (the + * one left un-acked) to the next one + * in the tmap. We do this so when + * we walk backwards we include marking + * sack-passed on rsm (The one passed in + * is skipped since it is generally called + * on something sacked before removing it + * from the tmap). + */ + if (rsm->r_in_tmap) { + nrsm = TAILQ_NEXT(rsm, r_tnext); + /* + * Now that we have the next + * one walk backwards from there. + */ + if (nrsm && nrsm->r_in_tmap) + rack_log_sack_passed(tp, rack, nrsm); + } + /* Now are we done? */ + if (SEQ_LT(end, next->r_end) || + (end == next->r_end)) { + /* Done with block */ + goto out; + } + counter_u64_add(rack_sack_used_next_merge, 1); + /* Postion for the next block */ + start = next->r_end; + rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, next); + if (rsm == NULL) + goto out; + } else { + /** + * We can't use any hookery here, so we + * need to split the map. We enter like + * so: + * rsm |--------| + * sackblk |-----> + * We will add the new block nrsm and + * that will be the new portion, and then + * fall through after reseting rsm. So we + * split and look like this: + * rsm |----| + * sackblk |-----> + * nrsm |---| + * We then fall through reseting + * rsm to nrsm, so the next block + * picks it up. + */ + nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT); + if (nrsm == NULL) { + /* + * failed XXXrrs what can we do but loose the sack + * info? + */ + goto out; + } + counter_u64_add(rack_sack_splits, 1); + rack_clone_rsm(rack, nrsm, rsm, start); + insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm); #ifdef INVARIANTS - panic("tp:%p rack:%p sack:%p to:%p prsm:%p", - tp, rack, sack, to, prsm); -#else - goto out; + if (insret != NULL) { + panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p", + nrsm, insret, rack, rsm); + } #endif + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + rsm->r_flags &= (~RACK_HAS_FIN); + /* Position us to point to the new nrsm that starts the sack blk */ + rsm = nrsm; + } + } else { + /* Already sacked this piece */ + counter_u64_add(rack_sack_skipped_acked, 1); + moved++; + if (end == rsm->r_end) { + /* Done with block */ + rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + goto out; + } else if (SEQ_LT(end, rsm->r_end)) { + /* A partial sack to a already sacked block */ + moved++; + rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + goto out; + } else { + /* + * The end goes beyond this guy + * repostion the start to the + * next block. + */ + start = rsm->r_end; + rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + if (rsm == NULL) + goto out; + } } - times++; - counter_u64_add(rack_sack_proc_restart, 1); - goto start_at_beginning; - } - /* Ok we have an ACK for some piece of rsm */ - if (rsm->r_start != start) { - /* - * Need to split this in two pieces the before and after. - */ - nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT); - if (nrsm == NULL) { - /* - * failed XXXrrs what can we do but loose the sack - * info? - */ - goto out; - } - nrsm->r_start = start; - nrsm->r_rtr_bytes = 0; - nrsm->r_end = rsm->r_end; - nrsm->r_rtr_cnt = rsm->r_rtr_cnt; - nrsm->r_flags = rsm->r_flags; - nrsm->r_sndcnt = rsm->r_sndcnt; - for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { - nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; - } - rsm->r_end = nrsm->r_start; - TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next); - if (rsm->r_in_tmap) { - TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext); - nrsm->r_in_tmap = 1; - } - rsm->r_flags &= (~RACK_HAS_FIN); - rsm = nrsm; } if (SEQ_GEQ(end, rsm->r_end)) { - /* + /** * The end of this block is either beyond this guy or right - * at this guy. + * at this guy. I.e.: + * rsm --- |-----| + * end |-----| + * <or> + * end |---------| */ - + if (rsm->r_flags & RACK_TLP) + rack->r_ctl.rc_tlp_rtx_out = 0; if ((rsm->r_flags & RACK_ACKED) == 0) { rack_update_rtt(tp, rack, rsm, to, cts, SACKED); changed += (rsm->r_end - rsm->r_start); rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); - rack_log_sack_passed(tp, rack, rsm); + if (rsm->r_in_tmap) /* should be true */ + rack_log_sack_passed(tp, rack, rsm); /* Is Reordering occuring? */ if (rsm->r_flags & RACK_SACK_PASSED) { + rsm->r_flags &= ~RACK_SACK_PASSED; counter_u64_add(rack_reorder_seen, 1); rack->r_ctl.rc_reorder_ts = cts; } @@ -4103,80 +4396,171 @@ do_rest_ofb: TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext); rsm->r_in_tmap = 0; } + } else { + counter_u64_add(rack_sack_skipped_acked, 1); + moved++; } if (end == rsm->r_end) { - /* This block only - done */ + /* This block only - done, setup for next */ goto out; } - /* There is more not coverend by this rsm move on */ + /* + * There is more not coverend by this rsm move on + * to the next block in the RB tree. + */ + nrsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); start = rsm->r_end; - nrsm = TAILQ_NEXT(rsm, r_next); rsm = nrsm; - times = 0; + if (rsm == NULL) + goto out; goto do_rest_ofb; } - /* Ok we need to split off this one at the tail */ - nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT); - if (nrsm == NULL) { - /* failed rrs what can we do but loose the sack info? */ - goto out; - } - /* Clone it */ - nrsm->r_start = end; - nrsm->r_end = rsm->r_end; - nrsm->r_rtr_bytes = 0; - nrsm->r_rtr_cnt = rsm->r_rtr_cnt; - nrsm->r_flags = rsm->r_flags; - nrsm->r_sndcnt = rsm->r_sndcnt; - for (idx = 0; idx < nrsm->r_rtr_cnt; idx++) { - nrsm->r_tim_lastsent[idx] = rsm->r_tim_lastsent[idx]; - } - /* The sack block does not cover this guy fully */ - rsm->r_flags &= (~RACK_HAS_FIN); - rsm->r_end = end; - TAILQ_INSERT_AFTER(&rack->r_ctl.rc_map, rsm, nrsm, r_next); - if (rsm->r_in_tmap) { - TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext); - nrsm->r_in_tmap = 1; - } - if (rsm->r_flags & RACK_ACKED) { - /* Been here done that */ - goto out; - } - rack_update_rtt(tp, rack, rsm, to, cts, SACKED); - changed += (rsm->r_end - rsm->r_start); - rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); - rack_log_sack_passed(tp, rack, rsm); - /* Is Reordering occuring? */ - if (rsm->r_flags & RACK_SACK_PASSED) { - counter_u64_add(rack_reorder_seen, 1); - rack->r_ctl.rc_reorder_ts = cts; - } - rsm->r_flags |= RACK_ACKED; - rsm->r_flags &= ~RACK_TLP; - if (rsm->r_in_tmap) { - TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext); - rsm->r_in_tmap = 0; + /** + * The end of this sack block is smaller than + * our rsm i.e.: + * rsm --- |-----| + * end |--| + */ + if ((rsm->r_flags & RACK_ACKED) == 0) { + prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + if (prev && (prev->r_flags & RACK_ACKED)) { + /** + * Goal, we want the right remainder of rsm to shrink + * in place and span from (rsm->r_start = end) to rsm->r_end. + * We want to expand prev to go all the way + * to prev->r_end <- end. + * so in the tree we have before: + * prev |--------| (acked) + * rsm |-------| (non-acked) + * sackblk |-| + * We churn it so we end up with + * prev |----------| (acked) + * rsm |-----| (non-acked) + * nrsm |-| (temporary) + */ + nrsm = &stack_map; + memcpy(nrsm, rsm, sizeof(struct rack_sendmap)); + prev->r_end = end; + rsm->r_start = end; + /* Now adjust nrsm (stack copy) to be + * the one that is the small + * piece that was "sacked". + */ + nrsm->r_end = end; + rsm->r_dupack = 0; + rack_log_retran_reason(rack, rsm, __LINE__, 0, 2); + /* + * Now nrsm is our new little piece + * that is acked (which was merged + * to prev). Update the rtt and changed + * based on that. Also check for reordering. + */ + rack_update_rtt(tp, rack, nrsm, to, cts, SACKED); + changed += (nrsm->r_end - nrsm->r_start); + rack->r_ctl.rc_sacked += (nrsm->r_end - nrsm->r_start); + if (nrsm->r_flags & RACK_SACK_PASSED) { + counter_u64_add(rack_reorder_seen, 1); + rack->r_ctl.rc_reorder_ts = cts; + } + rsm = prev; + counter_u64_add(rack_sack_used_prev_merge, 1); + } else { + /** + * This is the case where our previous + * block is not acked either, so we must + * split the block in two. + */ + nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT); + if (nrsm == NULL) { + /* failed rrs what can we do but loose the sack info? */ + goto out; + } + /** + * In this case nrsm becomes + * nrsm->r_start = end; + * nrsm->r_end = rsm->r_end; + * which is un-acked. + * <and> + * rsm->r_end = nrsm->r_start; + * i.e. the remaining un-acked + * piece is left on the left + * hand side. + * + * So we start like this + * rsm |----------| (not acked) + * sackblk |---| + * build it so we have + * rsm |---| (acked) + * nrsm |------| (not acked) + */ + counter_u64_add(rack_sack_splits, 1); + rack_clone_rsm(rack, nrsm, rsm, end); + rsm->r_flags &= (~RACK_HAS_FIN); + insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm); +#ifdef INVARIANTS + if (insret != NULL) { + panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p", + nrsm, insret, rack, rsm); + } +#endif + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + nrsm->r_dupack = 0; + rack_log_retran_reason(rack, nrsm, __LINE__, 0, 2); + if (rsm->r_flags & RACK_TLP) + rack->r_ctl.rc_tlp_rtx_out = 0; + rack_update_rtt(tp, rack, rsm, to, cts, SACKED); + changed += (rsm->r_end - rsm->r_start); + rack->r_ctl.rc_sacked += (rsm->r_end - rsm->r_start); + if (rsm->r_in_tmap) /* should be true */ + rack_log_sack_passed(tp, rack, rsm); + /* Is Reordering occuring? */ + if (rsm->r_flags & RACK_SACK_PASSED) { + rsm->r_flags &= ~RACK_SACK_PASSED; + counter_u64_add(rack_reorder_seen, 1); + rack->r_ctl.rc_reorder_ts = cts; + } + rsm->r_flags |= RACK_ACKED; + rsm->r_flags &= ~RACK_TLP; + if (rsm->r_in_tmap) { + TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext); + rsm->r_in_tmap = 0; + } + } + } else if (start != end){ + /* + * The block was already acked. + */ + counter_u64_add(rack_sack_skipped_acked, 1); + moved++; } out: if (rsm && (rsm->r_flags & RACK_ACKED)) { /* - * Now can we merge this newly acked - * block with either the previous or + * Now can we merge where we worked + * with either the previous or * next block? */ - nrsm = TAILQ_NEXT(rsm, r_next); - if (nrsm && - (nrsm->r_flags & RACK_ACKED)) { + next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + while (next) { + if (next->r_flags & RACK_ACKED) { /* yep this and next can be merged */ - rsm = rack_merge_rsm(rack, rsm, nrsm); + rsm = rack_merge_rsm(rack, rsm, next); + next = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + } else + break; } /* Now what about the previous? */ - nrsm = TAILQ_PREV(rsm, rack_head, r_next); - if (nrsm && - (nrsm->r_flags & RACK_ACKED)) { + prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + while (prev) { + if (prev->r_flags & RACK_ACKED) { /* yep the previous and this can be merged */ - rsm = rack_merge_rsm(rack, nrsm, rsm); + rsm = rack_merge_rsm(rack, prev, rsm); + prev = RB_PREV(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); + } else + break; } } if (used_ref == 0) { @@ -4184,12 +4568,14 @@ out: } else { counter_u64_add(rack_sack_proc_short, 1); } - /* Save off where we last were */ - if (rsm) - rack->r_ctl.rc_sacklast = TAILQ_NEXT(rsm, r_next); + /* Save off the next one for quick reference. */ + if (rsm) + nrsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); else - rack->r_ctl.rc_sacklast = NULL; - *prsm = rsm; + nrsm = NULL; + *prsm = rack->r_ctl.rc_sacklast = nrsm; + /* Pass back the moved. */ + *moved_two = moved; return (changed); } @@ -4218,7 +4604,7 @@ rack_peer_reneges(struct tcp_rack *rack, struct rack_sendmap *rsm, tcp_seq th_ac tmap = rsm; } tmap->r_in_tmap = 1; - rsm = TAILQ_NEXT(rsm, r_next); + rsm = RB_NEXT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); } /* * Now lets possibly clear the sack filter so we start @@ -4230,16 +4616,72 @@ rack_peer_reneges(struct tcp_rack *rack, struct rack_sendmap *rsm, tcp_seq th_ac } static void +rack_do_decay(struct tcp_rack *rack) +{ + struct timeval res; + +#define timersub(tvp, uvp, vvp) \ + do { \ + (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ + (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ + if ((vvp)->tv_usec < 0) { \ + (vvp)->tv_sec--; \ + (vvp)->tv_usec += 1000000; \ + } \ + } while (0) + + timersub(&rack->r_ctl.rc_last_ack, &rack->r_ctl.rc_last_time_decay, &res); +#undef timersub + + rack->r_ctl.input_pkt++; + if ((rack->rc_in_persist) || + (res.tv_sec >= 1) || + (rack->rc_tp->snd_max == rack->rc_tp->snd_una)) { + /* + * Check for decay of non-SAD, + * we want all SAD detection metrics to + * decay 1/4 per second (or more) passed. + */ + uint32_t pkt_delta; + + pkt_delta = rack->r_ctl.input_pkt - rack->r_ctl.saved_input_pkt; + /* Update our saved tracking values */ + rack->r_ctl.saved_input_pkt = rack->r_ctl.input_pkt; + rack->r_ctl.rc_last_time_decay = rack->r_ctl.rc_last_ack; + /* Now do we escape without decay? */ + if (rack->rc_in_persist || + (rack->rc_tp->snd_max == rack->rc_tp->snd_una) || + (pkt_delta < tcp_sad_low_pps)){ + /* + * We don't decay idle connections + * or ones that have a low input pps. + */ + return; + } + /* Decay the counters */ + rack->r_ctl.ack_count = ctf_decay_count(rack->r_ctl.ack_count, + tcp_sad_decay_val); + rack->r_ctl.sack_count = ctf_decay_count(rack->r_ctl.sack_count, + tcp_sad_decay_val); + rack->r_ctl.sack_moved_extra = ctf_decay_count(rack->r_ctl.sack_moved_extra, + tcp_sad_decay_val); + rack->r_ctl.sack_noextra_move = ctf_decay_count(rack->r_ctl.sack_noextra_move, + tcp_sad_decay_val); + } +} + +static void rack_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th) { - uint32_t changed, last_seq, entered_recovery = 0; + uint32_t changed, entered_recovery = 0; struct tcp_rack *rack; - struct rack_sendmap *rsm; + struct rack_sendmap *rsm, *rm; struct sackblk sack, sack_blocks[TCP_MAX_SACK + 1]; register uint32_t th_ack; int32_t i, j, k, num_sack_blks = 0; uint32_t cts, acked, ack_point, sack_changed = 0; - + int loop_start = 0, moved_two = 0; + INP_WLOCK_ASSERT(tp->t_inpcb); if (th->th_flags & TH_RST) { /* We don't log resets */ @@ -4247,10 +4689,31 @@ rack_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th) } rack = (struct tcp_rack *)tp->t_fb_ptr; cts = tcp_ts_getticks(); - rsm = TAILQ_FIRST(&rack->r_ctl.rc_map); + rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree); changed = 0; th_ack = th->th_ack; + if (rack->sack_attack_disable == 0) + rack_do_decay(rack); + if (BYTES_THIS_ACK(tp, th) >= ctf_fixed_maxseg(rack->rc_tp)) { + /* + * You only get credit for + * MSS and greater (and you get extra + * credit for larger cum-ack moves). + */ + int ac; + ac = BYTES_THIS_ACK(tp, th) / ctf_fixed_maxseg(rack->rc_tp); + rack->r_ctl.ack_count += ac; + counter_u64_add(rack_ack_total, ac); + } + if (rack->r_ctl.ack_count > 0xfff00000) { + /* + * reduce the number to keep us under + * a uint32_t. + */ + rack->r_ctl.ack_count /= 2; + rack->r_ctl.sack_count /= 2; + } if (SEQ_GT(th_ack, tp->snd_una)) { rack_log_progress_event(rack, tp, ticks, PROGRESS_UPDATE, __LINE__); tp->t_acktime = ticks; @@ -4264,8 +4727,8 @@ rack_log_ack(struct tcpcb *tp, struct tcpopt *to, struct tcphdr *th) * RTT's. */ rack->r_wanted_output++; -more: - rsm = TAILQ_FIRST(&rack->r_ctl.rc_map); + more: + rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree); if (rsm == NULL) { if ((th_ack - 1) == tp->iss) { /* @@ -4282,9 +4745,9 @@ more: } #ifdef INVARIANTS panic("No rack map tp:%p for th:%p state:%d rack:%p snd_una:%u snd_max:%u snd_nxt:%u chg:%d\n", - tp, - th, tp->t_state, rack, - tp->snd_una, tp->snd_max, tp->snd_nxt, changed); + tp, + th, tp->t_state, rack, + tp->snd_una, tp->snd_max, tp->snd_nxt, changed); #endif goto proc_sack; } @@ -4292,8 +4755,8 @@ more: /* Huh map is missing this */ #ifdef INVARIANTS printf("Rack map starts at r_start:%u for th_ack:%u huh? ts:%d rs:%d\n", - rsm->r_start, - th_ack, tp->t_state, rack->r_state); + rsm->r_start, + th_ack, tp->t_state, rack->r_state); #endif goto proc_sack; } @@ -4305,15 +4768,19 @@ more: rack->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; rsm->r_rtr_bytes = 0; - TAILQ_REMOVE(&rack->r_ctl.rc_map, rsm, r_next); + if (rsm->r_flags & RACK_TLP) + rack->r_ctl.rc_tlp_rtx_out = 0; + rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); +#ifdef INVARIANTS + if (rm != rsm) { + panic("removing head in rack:%p rsm:%p rm:%p", + rack, rsm, rm); + } +#endif if (rsm->r_in_tmap) { TAILQ_REMOVE(&rack->r_ctl.rc_tmap, rsm, r_tnext); rsm->r_in_tmap = 0; } - if (rack->r_ctl.rc_next == rsm) { - /* scoot along the marker */ - rack->r_ctl.rc_next = TAILQ_FIRST(&rack->r_ctl.rc_map); - } if (rsm->r_flags & RACK_ACKED) { /* * It was acked on the scoreboard -- remove @@ -4322,10 +4789,11 @@ more: rack->r_ctl.rc_sacked -= (rsm->r_end - rsm->r_start); } else if (rsm->r_flags & RACK_SACK_PASSED) { /* - * There are acked segments ACKED on the + * There are segments ACKED on the * scoreboard further up. We are seeing * reordering. */ + rsm->r_flags &= ~RACK_SACK_PASSED; counter_u64_add(rack_reorder_seen, 1); rsm->r_flags |= RACK_ACKED; rack->r_ctl.rc_reorder_ts = cts; @@ -4357,13 +4825,31 @@ more: */ rack->r_ctl.rc_sacked -= (th_ack - rsm->r_start); } - rack->r_ctl.rc_holes_rxt -= rsm->r_rtr_bytes; - rsm->r_rtr_bytes = 0; + /* + * Clear the dup ack count for + * the piece that remains. + */ + rsm->r_dupack = 0; + rack_log_retran_reason(rack, rsm, __LINE__, 0, 2); + if (rsm->r_rtr_bytes) { + /* + * It was retransmitted adjust the + * sack holes for what was acked. + */ + int ack_am; + + ack_am = (th_ack - rsm->r_start); + if (ack_am >= rsm->r_rtr_bytes) { + rack->r_ctl.rc_holes_rxt -= ack_am; + rsm->r_rtr_bytes -= ack_am; + } + } + /* Update where the piece starts */ rsm->r_start = th_ack; } proc_sack: /* Check for reneging */ - rsm = TAILQ_FIRST(&rack->r_ctl.rc_map); + rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree); if (rsm && (rsm->r_flags & RACK_ACKED) && (th_ack == rsm->r_start)) { /* * The peer has moved snd_una up to @@ -4382,15 +4868,9 @@ proc_sack: rack_peer_reneges(rack, rsm, th->th_ack); } if ((to->to_flags & TOF_SACK) == 0) { - /* We are done nothing left to log */ + /* We are done nothing left */ goto out; } - rsm = TAILQ_LAST_FAST(&rack->r_ctl.rc_map, rack_sendmap, r_next); - if (rsm) { - last_seq = rsm->r_end; - } else { - last_seq = tp->snd_max; - } /* Sack block processing */ if (SEQ_GT(th_ack, tp->snd_una)) ack_point = th_ack; @@ -4398,7 +4878,7 @@ proc_sack: ack_point = tp->snd_una; for (i = 0; i < to->to_nsacks; i++) { bcopy((to->to_sacks + i * TCPOLEN_SACK), - &sack, sizeof(sack)); + &sack, sizeof(sack)); sack.start = ntohl(sack.start); sack.end = ntohl(sack.end); if (SEQ_GT(sack.end, sack.start) && @@ -4406,28 +4886,19 @@ proc_sack: SEQ_LT(sack.start, tp->snd_max) && SEQ_GT(sack.end, ack_point) && SEQ_LEQ(sack.end, tp->snd_max)) { - if ((rack->r_ctl.rc_num_maps_alloced > rack_sack_block_limit) && - (SEQ_LT(sack.end, last_seq)) && - ((sack.end - sack.start) < (tp->t_maxseg / 8))) { - /* - * Not the last piece and its smaller than - * 1/8th of a MSS. We ignore this. - */ - counter_u64_add(rack_runt_sacks, 1); - continue; - } sack_blocks[num_sack_blks] = sack; num_sack_blks++; +#ifdef NETFLIX_STATS } else if (SEQ_LEQ(sack.start, th_ack) && SEQ_LEQ(sack.end, th_ack)) { /* * Its a D-SACK block. */ -/* tcp_record_dsack(sack.start, sack.end); */ + tcp_record_dsack(sack.start, sack.end); +#endif } + } - if (num_sack_blks == 0) - goto out; /* * Sort the SACK blocks so we can update the rack scoreboard with * just one pass. @@ -4437,7 +4908,12 @@ proc_sack: num_sack_blks, th->th_ack); ctf_log_sack_filter(rack->rc_tp, num_sack_blks, sack_blocks); } + if (num_sack_blks == 0) { + /* Nothing to sack (DSACKs?) */ + goto out_with_totals; + } if (num_sack_blks < 2) { + /* Only one, we don't need to sort */ goto do_sack_work; } /* Sort the sacks */ @@ -4452,9 +4928,11 @@ proc_sack: } /* * Now are any of the sack block ends the same (yes some - * implememtations send these)? + * implementations send these)? */ again: + if (num_sack_blks == 0) + goto out_with_totals; if (num_sack_blks > 1) { for (i = 0; i < num_sack_blks; i++) { for (j = i + 1; j < num_sack_blks; j++) { @@ -4488,16 +4966,230 @@ again: } } do_sack_work: + /* + * First lets look to see if + * we have retransmitted and + * can use the transmit next? + */ + rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap); + if (rsm && + SEQ_GT(sack_blocks[0].end, rsm->r_start) && + SEQ_LT(sack_blocks[0].start, rsm->r_end)) { + /* + * We probably did the FR and the next + * SACK in continues as we would expect. + */ + acked = rack_proc_sack_blk(tp, rack, &sack_blocks[0], to, &rsm, cts, &moved_two); + if (acked) { + rack->r_wanted_output++; + changed += acked; + sack_changed += acked; + } + if (num_sack_blks == 1) { + /* + * This is what we would expect from + * a normal implementation to happen + * after we have retransmitted the FR, + * i.e the sack-filter pushes down + * to 1 block and the next to be retransmitted + * is the sequence in the sack block (has more + * are acked). Count this as ACK'd data to boost + * up the chances of recovering any false positives. + */ + rack->r_ctl.ack_count += (acked / ctf_fixed_maxseg(rack->rc_tp)); + counter_u64_add(rack_ack_total, (acked / ctf_fixed_maxseg(rack->rc_tp))); + counter_u64_add(rack_express_sack, 1); + if (rack->r_ctl.ack_count > 0xfff00000) { + /* + * reduce the number to keep us under + * a uint32_t. + */ + rack->r_ctl.ack_count /= 2; + rack->r_ctl.sack_count /= 2; + } + goto out_with_totals; + } else { + /* + * Start the loop through the + * rest of blocks, past the first block. + */ + moved_two = 0; + loop_start = 1; + } + } + /* Its a sack of some sort */ + rack->r_ctl.sack_count++; + if (rack->r_ctl.sack_count > 0xfff00000) { + /* + * reduce the number to keep us under + * a uint32_t. + */ + rack->r_ctl.ack_count /= 2; + rack->r_ctl.sack_count /= 2; + } + counter_u64_add(rack_sack_total, 1); + if (rack->sack_attack_disable) { + /* An attacker disablement is in place */ + if (num_sack_blks > 1) { + rack->r_ctl.sack_count += (num_sack_blks - 1); + rack->r_ctl.sack_moved_extra++; + counter_u64_add(rack_move_some, 1); + if (rack->r_ctl.sack_moved_extra > 0xfff00000) { + rack->r_ctl.sack_moved_extra /= 2; + rack->r_ctl.sack_noextra_move /= 2; + } + } + goto out; + } rsm = rack->r_ctl.rc_sacklast; - for (i = 0; i < num_sack_blks; i++) { - acked = rack_proc_sack_blk(tp, rack, &sack_blocks[i], to, &rsm, cts); + for (i = loop_start; i < num_sack_blks; i++) { + acked = rack_proc_sack_blk(tp, rack, &sack_blocks[i], to, &rsm, cts, &moved_two); if (acked) { rack->r_wanted_output++; changed += acked; sack_changed += acked; } + if (moved_two) { + /* + * If we did not get a SACK for at least a MSS and + * had to move at all, or if we moved more than our + * threshold, it counts against the "extra" move. + */ + rack->r_ctl.sack_moved_extra += moved_two; + counter_u64_add(rack_move_some, 1); + } else { + /* + * else we did not have to move + * any more than we would expect. + */ + rack->r_ctl.sack_noextra_move++; + counter_u64_add(rack_move_none, 1); + } + if (moved_two && (acked < ctf_fixed_maxseg(rack->rc_tp))) { + /* + * If the SACK was not a full MSS then + * we add to sack_count the number of + * MSS's (or possibly more than + * a MSS if its a TSO send) we had to skip by. + */ + rack->r_ctl.sack_count += moved_two; + counter_u64_add(rack_sack_total, moved_two); + } + /* + * Now we need to setup for the next + * round. First we make sure we won't + * exceed the size of our uint32_t on + * the various counts, and then clear out + * moved_two. + */ + if ((rack->r_ctl.sack_moved_extra > 0xfff00000) || + (rack->r_ctl.sack_noextra_move > 0xfff00000)) { + rack->r_ctl.sack_moved_extra /= 2; + rack->r_ctl.sack_noextra_move /= 2; + } + if (rack->r_ctl.sack_count > 0xfff00000) { + rack->r_ctl.ack_count /= 2; + rack->r_ctl.sack_count /= 2; + } + moved_two = 0; + } +out_with_totals: + if (num_sack_blks > 1) { + /* + * You get an extra stroke if + * you have more than one sack-blk, this + * could be where we are skipping forward + * and the sack-filter is still working, or + * it could be an attacker constantly + * moving us. + */ + rack->r_ctl.sack_moved_extra++; + counter_u64_add(rack_move_some, 1); } out: +#ifdef NETFLIX_EXP_DETECTION + if ((rack->do_detection || tcp_force_detection) && + tcp_sack_to_ack_thresh && + tcp_sack_to_move_thresh && + ((rack->r_ctl.rc_num_maps_alloced > tcp_map_minimum) || rack->sack_attack_disable)) { + /* + * We have thresholds set to find + * possible attackers and disable sack. + * Check them. + */ + uint64_t ackratio, moveratio, movetotal; + + /* Log detecting */ + rack_log_sad(rack, 1); + ackratio = (uint64_t)(rack->r_ctl.sack_count); + ackratio *= (uint64_t)(1000); + if (rack->r_ctl.ack_count) + ackratio /= (uint64_t)(rack->r_ctl.ack_count); + else { + /* We really should not hit here */ + ackratio = 1000; + } + if ((rack->sack_attack_disable == 0) && + (ackratio > rack_highest_sack_thresh_seen)) + rack_highest_sack_thresh_seen = (uint32_t)ackratio; + movetotal = rack->r_ctl.sack_moved_extra; + movetotal += rack->r_ctl.sack_noextra_move; + moveratio = rack->r_ctl.sack_moved_extra; + moveratio *= (uint64_t)1000; + if (movetotal) + moveratio /= movetotal; + else { + /* No moves, thats pretty good */ + moveratio = 0; + } + if ((rack->sack_attack_disable == 0) && + (moveratio > rack_highest_move_thresh_seen)) + rack_highest_move_thresh_seen = (uint32_t)moveratio; + if (rack->sack_attack_disable == 0) { + if ((ackratio > tcp_sack_to_ack_thresh) && + (moveratio > tcp_sack_to_move_thresh)) { + /* Disable sack processing */ + rack->sack_attack_disable = 1; + if (rack->r_rep_attack == 0) { + rack->r_rep_attack = 1; + counter_u64_add(rack_sack_attacks_detected, 1); + } + if (tcp_attack_on_turns_on_logging) { + /* + * Turn on logging, used for debugging + * false positives. + */ + rack->rc_tp->t_logstate = tcp_attack_on_turns_on_logging; + } + /* Clamp the cwnd at flight size */ + rack->r_ctl.rc_saved_cwnd = rack->rc_tp->snd_cwnd; + rack->rc_tp->snd_cwnd = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + rack_log_sad(rack, 2); + } + } else { + /* We are sack-disabled check for false positives */ + if ((ackratio <= tcp_restoral_thresh) || + (rack->r_ctl.rc_num_maps_alloced < tcp_map_minimum)) { + rack->sack_attack_disable = 0; + rack_log_sad(rack, 3); + /* Restart counting */ + rack->r_ctl.sack_count = 0; + rack->r_ctl.sack_moved_extra = 0; + rack->r_ctl.sack_noextra_move = 1; + rack->r_ctl.ack_count = max(1, + (BYTES_THIS_ACK(tp, th)/ctf_fixed_maxseg(rack->rc_tp))); + + if (rack->r_rep_reverse == 0) { + rack->r_rep_reverse = 1; + counter_u64_add(rack_sack_attacks_reversed, 1); + } + /* Restore the cwnd */ + if (rack->r_ctl.rc_saved_cwnd > rack->rc_tp->snd_cwnd) + rack->rc_tp->snd_cwnd = rack->r_ctl.rc_saved_cwnd; + } + } + } +#endif if (changed) { /* Something changed cancel the rack timer */ rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__); @@ -4523,12 +5215,13 @@ out: * When we enter recovery we need to assure we send * one packet. */ - rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg; + rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp); + rack_log_to_prr(rack, 8); rack->r_timer_override = 1; } } if (IN_RECOVERY(tp->t_flags) && (entered_recovery == 0)) { - /* Deal with changed an PRR here (in recovery only) */ + /* Deal with changed and PRR here (in recovery only) */ uint32_t pipe, snd_una; rack->r_ctl.rc_prr_delivered += changed; @@ -4547,6 +5240,7 @@ out: sndcnt /= (long)rack->r_ctl.rc_prr_recovery_fs; else { rack->r_ctl.rc_prr_sndcnt = 0; + rack_log_to_prr(rack, 9); sndcnt = 0; } sndcnt++; @@ -4555,6 +5249,7 @@ out: else sndcnt = 0; rack->r_ctl.rc_prr_sndcnt = sndcnt; + rack_log_to_prr(rack, 10); } else { uint32_t limit; @@ -4564,19 +5259,38 @@ out: limit = 0; if (changed > limit) limit = changed; - limit += tp->t_maxseg; + limit += ctf_fixed_maxseg(tp); if (tp->snd_ssthresh > pipe) { rack->r_ctl.rc_prr_sndcnt = min((tp->snd_ssthresh - pipe), limit); + rack_log_to_prr(rack, 11); } else { rack->r_ctl.rc_prr_sndcnt = min(0, limit); + rack_log_to_prr(rack, 12); } } - if (rack->r_ctl.rc_prr_sndcnt >= tp->t_maxseg) { + if (rack->r_ctl.rc_prr_sndcnt >= ctf_fixed_maxseg(tp)) { rack->r_timer_override = 1; } } } +static void +rack_strike_dupack(struct tcp_rack *rack) +{ + struct rack_sendmap *rsm; + + rsm = TAILQ_FIRST(&rack->r_ctl.rc_tmap); + if (rsm && (rsm->r_dupack < 0xff)) { + rsm->r_dupack++; + if (rsm->r_dupack >= DUP_ACK_THRESHOLD) { + rack->r_wanted_output = 1; + rack_log_retran_reason(rack, rsm, __LINE__, 1, 3); + } else { + rack_log_retran_reason(rack, rsm, __LINE__, 0, 3); + } + } +} + /* * Return value of 1, we do not need to call rack_process_data(). * return value of 0, rack_process_data can be called. @@ -4598,10 +5312,15 @@ rack_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, rack = (struct tcp_rack *)tp->t_fb_ptr; if (SEQ_GT(th->th_ack, tp->snd_max)) { - rack_do_dropafterack(m, tp, th, thflags, tlen, ret_val); + ctf_do_dropafterack(m, tp, th, thflags, tlen, ret_val); + rack->r_wanted_output++; return (1); } if (SEQ_GEQ(th->th_ack, tp->snd_una) || to->to_nsacks) { + if (rack->rc_in_persist) + tp->t_rxtshift = 0; + if ((th->th_ack == tp->snd_una) && (tiwin == tp->snd_wnd)) + rack_strike_dupack(rack); rack_log_ack(tp, to, th); } if (__predict_false(SEQ_LEQ(th->th_ack, tp->snd_una))) { @@ -4675,9 +5394,6 @@ rack_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__); rack->r_wanted_output++; } - /* - * If no data (only SYN) was ACK'd, skip rest of ACK processing. - */ if (acked == 0) { if (ofia) *ofia = ourfinisacked; @@ -4732,7 +5448,8 @@ rack_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, if (tp->snd_una == tp->snd_max) { /* Nothing left outstanding */ rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__); - tp->t_acktime = 0; + if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) + tp->t_acktime = 0; rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__); /* Set need output so persist might get set */ rack->r_wanted_output++; @@ -4748,7 +5465,7 @@ rack_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, */ *ret_val = 1; tp = tcp_close(tp); - rack_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, tlen); return (1); } } @@ -4757,6 +5474,91 @@ rack_process_ack(struct mbuf *m, struct tcphdr *th, struct socket *so, return (0); } +static void +rack_collapsed_window(struct tcp_rack *rack) +{ + /* + * Now we must walk the + * send map and divide the + * ones left stranded. These + * guys can't cause us to abort + * the connection and are really + * "unsent". However if a buggy + * client actually did keep some + * of the data i.e. collapsed the win + * and refused to ack and then opened + * the win and acked that data. We would + * get into an ack war, the simplier + * method then of just pretending we + * did not send those segments something + * won't work. + */ + struct rack_sendmap *rsm, *nrsm, fe, *insret; + tcp_seq max_seq; + uint32_t maxseg; + + max_seq = rack->rc_tp->snd_una + rack->rc_tp->snd_wnd; + maxseg = ctf_fixed_maxseg(rack->rc_tp); + memset(&fe, 0, sizeof(fe)); + fe.r_start = max_seq; + /* Find the first seq past or at maxseq */ + rsm = RB_FIND(rack_rb_tree_head, &rack->r_ctl.rc_mtree, &fe); + if (rsm == NULL) { + /* Nothing to do strange */ + rack->rc_has_collapsed = 0; + return; + } + /* + * Now do we need to split at + * the collapse point? + */ + if (SEQ_GT(max_seq, rsm->r_start)) { + nrsm = rack_alloc_limit(rack, RACK_LIMIT_TYPE_SPLIT); + if (nrsm == NULL) { + /* We can't get a rsm, mark all? */ + nrsm = rsm; + goto no_split; + } + /* Clone it */ + rack_clone_rsm(rack, nrsm, rsm, max_seq); + insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm); +#ifdef INVARIANTS + if (insret != NULL) { + panic("Insert in rb tree of %p fails ret:%p rack:%p rsm:%p", + nrsm, insret, rack, rsm); + } +#endif + if (rsm->r_in_tmap) { + TAILQ_INSERT_AFTER(&rack->r_ctl.rc_tmap, rsm, nrsm, r_tnext); + nrsm->r_in_tmap = 1; + } + /* + * Set in the new RSM as the + * collapsed starting point + */ + rsm = nrsm; + } +no_split: + counter_u64_add(rack_collapsed_win, 1); + RB_FOREACH_FROM(nrsm, rack_rb_tree_head, rsm) { + nrsm->r_flags |= RACK_RWND_COLLAPSED; + rack->rc_has_collapsed = 1; + } +} + +static void +rack_un_collapse_window(struct tcp_rack *rack) +{ + struct rack_sendmap *rsm; + + RB_FOREACH_REVERSE(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree) { + if (rsm->r_flags & RACK_RWND_COLLAPSED) + rsm->r_flags &= ~RACK_RWND_COLLAPSED; + else + break; + } + rack->rc_has_collapsed = 0; +} /* * Return value of 1, the TCB is unlocked and most @@ -4773,11 +5575,7 @@ rack_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so, * send garbage on first SYN. */ int32_t nsegs; -#ifdef TCP_RFC7413 int32_t tfo_syn; -#else -#define tfo_syn (FALSE) -#endif struct tcp_rack *rack; rack = (struct tcp_rack *)tp->t_fb_ptr; @@ -4804,13 +5602,36 @@ rack_process_data(struct mbuf *m, struct tcphdr *th, struct socket *so, tp->snd_wl2 = th->th_ack; } } + if (tp->snd_wnd < ctf_outstanding(tp)) + /* The peer collapsed the window */ + rack_collapsed_window(rack); + else if (rack->rc_has_collapsed) + rack_un_collapse_window(rack); /* Was persist timer active and now we have window space? */ - if ((rack->rc_in_persist != 0) && tp->snd_wnd) { + if ((rack->rc_in_persist != 0) && + (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2), + rack->r_ctl.rc_pace_min_segs))) { rack_exit_persist(tp, rack); tp->snd_nxt = tp->snd_max; /* Make sure we output to start the timer */ rack->r_wanted_output++; } + /* Do we enter persists? */ + if ((rack->rc_in_persist == 0) && + (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) && + TCPS_HAVEESTABLISHED(tp->t_state) && + (tp->snd_max == tp->snd_una) && + sbavail(&tp->t_inpcb->inp_socket->so_snd) && + (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { + /* + * Here the rwnd is less than + * the pacing size, we are established, + * nothing is outstanding, and there is + * data to send. Enter persists. + */ + tp->snd_nxt = tp->snd_una; + rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime); + } if (tp->t_flags2 & TF2_DROP_AF_DATA) { m_freem(m); return (0); @@ -4886,10 +5707,8 @@ dodata: /* XXX */ * PRU_RCVD). If a FIN has already been received on this connection * then we just ignore the text. */ -#ifdef TCP_RFC7413 tfo_syn = ((tp->t_state == TCPS_SYN_RECEIVED) && - (tp->t_flags & TF_FASTOPEN)); -#endif + IS_FASTOPEN(tp->t_flags)); if ((tlen || (thflags & TH_FIN) || tfo_syn) && TCPS_HAVERCVDFIN(tp->t_state) == 0) { tcp_seq save_start = th->th_seq; @@ -4912,6 +5731,20 @@ dodata: /* XXX */ SEGQ_EMPTY(tp) && (TCPS_HAVEESTABLISHED(tp->t_state) || tfo_syn)) { +#ifdef NETFLIX_SB_LIMITS + u_int mcnt, appended; + + if (so->so_rcv.sb_shlim) { + mcnt = m_memcnt(m); + appended = 0; + if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, + CFO_NOSLEEP, NULL) == false) { + counter_u64_add(tcp_sb_shlim_fails, 1); + m_freem(m); + return (0); + } + } +#endif if (DELAY_ACK(tp, tlen) || tfo_syn) { rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__); @@ -4925,12 +5758,20 @@ dodata: /* XXX */ TCPSTAT_ADD(tcps_rcvpack, nsegs); TCPSTAT_ADD(tcps_rcvbyte, tlen); SOCKBUF_LOCK(&so->so_rcv); - if (so->so_rcv.sb_state & SBS_CANTRCVMORE) + if (so->so_rcv.sb_state & SBS_CANTRCVMORE) { m_freem(m); - else - sbappendstream_locked(&so->so_rcv, m, 0); + } else +#ifdef NETFLIX_SB_LIMITS + appended = +#endif + sbappendstream_locked(&so->so_rcv, m, 0); /* NB: sorwakeup_locked() does an implicit unlock. */ sorwakeup_locked(so); +#ifdef NETFLIX_SB_LIMITS + if (so->so_rcv.sb_shlim && appended != mcnt) + counter_fo_release(so->so_rcv.sb_shlim, + mcnt - appended); +#endif } else { /* * XXX: Due to the header drop above "th" is @@ -5063,6 +5904,9 @@ rack_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so, int32_t nsegs; int32_t newsize = 0; /* automatic sockbuf scaling */ struct tcp_rack *rack; +#ifdef NETFLIX_SB_LIMITS + u_int mcnt, appended; +#endif #ifdef TCPDEBUG /* * The size of tcp_saveipgen must be the size of the max ip header, @@ -5112,10 +5956,21 @@ rack_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so, */ nsegs = max(1, m->m_pkthdr.lro_nsegs); - +#ifdef NETFLIX_SB_LIMITS + if (so->so_rcv.sb_shlim) { + mcnt = m_memcnt(m); + appended = 0; + if (counter_fo_get(so->so_rcv.sb_shlim, mcnt, + CFO_NOSLEEP, NULL) == false) { + counter_u64_add(tcp_sb_shlim_fails, 1); + m_freem(m); + return (1); + } + } +#endif /* Clean receiver SACK report if present */ if (tp->rcv_numsacks) - tcp_clean_sackreport(tp); + tcp_clean_sackreport(tp); TCPSTAT_INC(tcps_preddat); tp->rcv_nxt += tlen; /* @@ -5149,11 +6004,18 @@ rack_do_fastnewdata(struct mbuf *m, struct tcphdr *th, struct socket *so, newsize, so, NULL)) so->so_rcv.sb_flags &= ~SB_AUTOSIZE; m_adj(m, drop_hdrlen); /* delayed header drop */ - sbappendstream_locked(&so->so_rcv, m, 0); - rack_calc_rwin(so, tp); +#ifdef NETFLIX_SB_LIMITS + appended = +#endif + sbappendstream_locked(&so->so_rcv, m, 0); + ctf_calc_rwin(so, tp); } /* NB: sorwakeup_locked() does an implicit unlock. */ sorwakeup_locked(so); +#ifdef NETFLIX_SB_LIMITS + if (so->so_rcv.sb_shlim && mcnt != appended) + counter_fo_release(so->so_rcv.sb_shlim, mcnt - appended); +#endif if (DELAY_ACK(tp, tlen)) { rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__); tp->t_flags |= TF_DELACK; @@ -5231,6 +6093,12 @@ rack_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so, /* Ok if we reach here, we can process a fast-ack */ nsegs = max(1, m->m_pkthdr.lro_nsegs); rack_log_ack(tp, to, th); + /* + * We made progress, clear the tlp + * out flag so we could start a TLP + * again. + */ + rack->r_ctl.rc_tlp_rtx_out = 0; /* Did the window get updated? */ if (tiwin != tp->snd_wnd) { tp->snd_wnd = tiwin; @@ -5238,9 +6106,28 @@ rack_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so, if (tp->snd_wnd > tp->max_sndwnd) tp->max_sndwnd = tp->snd_wnd; } - if ((rack->rc_in_persist != 0) && (tp->snd_wnd >= tp->t_maxseg)) { + /* Do we exit persists? */ + if ((rack->rc_in_persist != 0) && + (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2), + rack->r_ctl.rc_pace_min_segs))) { rack_exit_persist(tp, rack); } + /* Do we enter persists? */ + if ((rack->rc_in_persist == 0) && + (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) && + TCPS_HAVEESTABLISHED(tp->t_state) && + (tp->snd_max == tp->snd_una) && + sbavail(&tp->t_inpcb->inp_socket->so_snd) && + (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd)) { + /* + * Here the rwnd is less than + * the pacing size, we are established, + * nothing is outstanding, and there is + * data to send. Enter persists. + */ + tp->snd_nxt = tp->snd_una; + rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime); + } /* * If last ACK falls within this segment's sequence numbers, record * the timestamp. NOTE that the test is modified according to the @@ -5290,6 +6177,12 @@ rack_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so, rack_ack_received(tp, rack, th, nsegs, CC_ACK, 0); tp->snd_una = th->th_ack; + if (tp->snd_wnd < ctf_outstanding(tp)) { + /* The peer collapsed the window */ + rack_collapsed_window(rack); + } else if (rack->rc_has_collapsed) + rack_un_collapse_window(rack); + /* * Pull snd_wl2 up to prevent seq wrap relative to th_ack. */ @@ -5313,7 +6206,8 @@ rack_fastack(struct mbuf *m, struct tcphdr *th, struct socket *so, #endif if (tp->snd_una == tp->snd_max) { rack_log_progress_event(rack, tp, 0, PROGRESS_CLEAR, __LINE__); - tp->t_acktime = 0; + if (sbavail(&tp->t_inpcb->inp_socket->so_snd) == 0) + tp->t_acktime = 0; rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__); } /* Wake up the socket if we have room to write more */ @@ -5337,8 +6231,9 @@ rack_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, int32_t ret_val = 0; int32_t todrop; int32_t ourfinisacked = 0; + struct tcp_rack *rack; - rack_calc_rwin(so, tp); + ctf_calc_rwin(so, tp); /* * If the state is SYN_SENT: if seg contains an ACK, but not for our * SYN, drop the input. if seg contains a RST, then drop the @@ -5353,27 +6248,30 @@ rack_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, if ((thflags & TH_ACK) && (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) { - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } if ((thflags & (TH_ACK | TH_RST)) == (TH_ACK | TH_RST)) { TCP_PROBE5(connect__refused, NULL, tp, mtod(m, const char *), tp, th); tp = tcp_drop(tp, ECONNREFUSED); - rack_do_drop(m, tp); + ctf_do_drop(m, tp); return (1); } if (thflags & TH_RST) { - rack_do_drop(m, tp); + ctf_do_drop(m, tp); return (1); } if (!(thflags & TH_SYN)) { - rack_do_drop(m, tp); + ctf_do_drop(m, tp); return (1); } tp->irs = th->th_seq; tcp_rcvseqinit(tp); + rack = (struct tcp_rack *)tp->t_fb_ptr; if (thflags & TH_ACK) { + int tfo_partial = 0; + TCPSTAT_INC(tcps_connects); soisconnected(so); #ifdef MAC @@ -5387,22 +6285,47 @@ rack_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, tp->rcv_adv += min(tp->rcv_wnd, TCP_MAXWIN << tp->rcv_scale); /* + * If not all the data that was sent in the TFO SYN + * has been acked, resend the remainder right away. + */ + if (IS_FASTOPEN(tp->t_flags) && + (tp->snd_una != tp->snd_max)) { + tp->snd_nxt = th->th_ack; + tfo_partial = 1; + } + /* * If there's data, delay ACK; if there's also a FIN ACKNOW * will be turned on later. */ - if (DELAY_ACK(tp, tlen) && tlen != 0) { - rack_timer_cancel(tp, (struct tcp_rack *)tp->t_fb_ptr, - ((struct tcp_rack *)tp->t_fb_ptr)->r_ctl.rc_rcvtime, __LINE__); + if (DELAY_ACK(tp, tlen) && tlen != 0 && (tfo_partial == 0)) { + rack_timer_cancel(tp, rack, + rack->r_ctl.rc_rcvtime, __LINE__); tp->t_flags |= TF_DELACK; } else { - ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++; + rack->r_wanted_output++; tp->t_flags |= TF_ACKNOW; } - if ((thflags & TH_ECE) && V_tcp_do_ecn) { + if (((thflags & (TH_CWR | TH_ECE)) == TH_ECE) && + V_tcp_do_ecn) { tp->t_flags |= TF_ECN_PERMIT; TCPSTAT_INC(tcps_ecn_shs); } + if (SEQ_GT(th->th_ack, tp->snd_una)) { + /* + * We advance snd_una for the + * fast open case. If th_ack is + * acknowledging data beyond + * snd_una we can't just call + * ack-processing since the + * data stream in our send-map + * will start at snd_una + 1 (one + * beyond the SYN). If its just + * equal we don't need to do that + * and there is no send_map. + */ + tp->snd_una++; + } /* * Received <SYN,ACK> in SYN_SENT[*] state. Transitions: * SYN_SENT --> ESTABLISHED SYN_SENT* --> FIN_WAIT_1 @@ -5454,6 +6377,16 @@ rack_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, * of step 5, ack processing. Otherwise, goto step 6. */ if (thflags & TH_ACK) { + /* For syn-sent we need to possibly update the rtt */ + if ((to->to_flags & TOF_TS) != 0 && to->to_tsecr) { + uint32_t t; + + t = tcp_ts_getticks() - to->to_tsecr; + if (!tp->t_rttlow || tp->t_rttlow > t) + tp->t_rttlow = t; + tcp_rack_xmit_timer(rack, t + 1); + tcp_rack_xmit_timer_commit(rack, tp); + } if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) return (ret_val); /* We may have changed to FIN_WAIT_1 above */ @@ -5486,7 +6419,7 @@ rack_do_syn_sent(struct mbuf *m, struct tcphdr *th, struct socket *so, } } return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen, - tiwin, thflags, nxt_pkt)); + tiwin, thflags, nxt_pkt)); } /* @@ -5499,62 +6432,52 @@ rack_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp, struct tcpopt *to, int32_t drop_hdrlen, int32_t tlen, uint32_t tiwin, int32_t thflags, int32_t nxt_pkt) { + struct tcp_rack *rack; int32_t ret_val = 0; int32_t ourfinisacked = 0; - rack_calc_rwin(so, tp); - + ctf_calc_rwin(so, tp); if ((thflags & TH_ACK) && (SEQ_LEQ(th->th_ack, tp->snd_una) || SEQ_GT(th->th_ack, tp->snd_max))) { - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } -#ifdef TCP_RFC7413 - if (tp->t_flags & TF_FASTOPEN) { + rack = (struct tcp_rack *)tp->t_fb_ptr; + if (IS_FASTOPEN(tp->t_flags)) { /* - * When a TFO connection is in SYN_RECEIVED, the only valid - * packets are the initial SYN, a retransmit/copy of the - * initial SYN (possibly with a subset of the original - * data), a valid ACK, a FIN, or a RST. + * When a TFO connection is in SYN_RECEIVED, the + * only valid packets are the initial SYN, a + * retransmit/copy of the initial SYN (possibly with + * a subset of the original data), a valid ACK, a + * FIN, or a RST. */ if ((thflags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) { - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } else if (thflags & TH_SYN) { /* non-initial SYN is ignored */ - struct tcp_rack *rack; - - rack = (struct tcp_rack *)tp->t_fb_ptr; if ((rack->r_ctl.rc_hpts_flags & PACE_TMR_RXT) || (rack->r_ctl.rc_hpts_flags & PACE_TMR_TLP) || (rack->r_ctl.rc_hpts_flags & PACE_TMR_RACK)) { - rack_do_drop(m, NULL); + ctf_do_drop(m, NULL); return (0); } } else if (!(thflags & (TH_ACK | TH_FIN | TH_RST))) { - rack_do_drop(m, NULL); + ctf_do_drop(m, NULL); return (0); } } -#endif - if (thflags & TH_RST) - return (rack_process_rst(m, th, so, tp)); - /* - * RFC5961 Section 4.2 Send challenge ACK for any SYN in - * synchronized state. - */ - if (thflags & TH_SYN) { - rack_challenge_ack(m, th, tp, &ret_val); - return (ret_val); - } + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); /* * RFC 1323 PAWS: If we have a timestamp reply on this segment and * it's less than ts_recent, drop it. */ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && TSTMP_LT(to->to_tsval, tp->ts_recent)) { - if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val)) + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) return (ret_val); } /* @@ -5565,10 +6488,10 @@ rack_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, * "LAND" DoS attack. */ if (SEQ_LT(th->th_seq, tp->irs)) { - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } - if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { return (ret_val); } /* @@ -5592,18 +6515,16 @@ rack_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, tp->ts_recent_age = tcp_ts_getticks(); tp->ts_recent = to->to_tsval; } + tp->snd_wnd = tiwin; /* * If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN flag * is on (half-synchronized state), then queue data for later * processing; else drop segment and return. */ if ((thflags & TH_ACK) == 0) { -#ifdef TCP_RFC7413 - if (tp->t_flags & TF_FASTOPEN) { - tp->snd_wnd = tiwin; + if (IS_FASTOPEN(tp->t_flags)) { cc_conn_init(tp); } -#endif return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen, tiwin, thflags, nxt_pkt)); } @@ -5613,13 +6534,22 @@ rack_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) == (TF_RCVD_SCALE | TF_REQ_SCALE)) { tp->rcv_scale = tp->request_r_scale; - tp->snd_wnd = tiwin; } /* * Make transitions: SYN-RECEIVED -> ESTABLISHED SYN-RECEIVED* -> * FIN-WAIT-1 */ tp->t_starttime = ticks; + if (IS_FASTOPEN(tp->t_flags) && tp->t_tfo_pending) { + tcp_fastopen_decrement_counter(tp->t_tfo_pending); + tp->t_tfo_pending = NULL; + + /* + * Account for the ACK of our SYN prior to + * regular ACK processing below. + */ + tp->snd_una++; + } if (tp->t_flags & TF_NEEDFIN) { tcp_state_change(tp, TCPS_FIN_WAIT_1); tp->t_flags &= ~TF_NEEDFIN; @@ -5627,25 +6557,13 @@ rack_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, tcp_state_change(tp, TCPS_ESTABLISHED); TCP_PROBE5(accept__established, NULL, tp, mtod(m, const char *), tp, th); -#ifdef TCP_RFC7413 - if (tp->t_tfo_pending) { - tcp_fastopen_decrement_counter(tp->t_tfo_pending); - tp->t_tfo_pending = NULL; - - /* - * Account for the ACK of our SYN prior to regular - * ACK processing below. - */ - tp->snd_una++; - } /* * TFO connections call cc_conn_init() during SYN * processing. Calling it again here for such connections * is not harmless as it would undo the snd_cwnd reduction * that occurs when a TFO SYN|ACK is retransmitted. */ - if (!(tp->t_flags & TF_FASTOPEN)) -#endif + if (!IS_FASTOPEN(tp->t_flags)) cc_conn_init(tp); } /* @@ -5653,9 +6571,19 @@ rack_do_syn_recv(struct mbuf *m, struct tcphdr *th, struct socket *so, * not, do so now to pass queued data to user. */ if (tlen == 0 && (thflags & TH_FIN) == 0) - (void)tcp_reass(tp, (struct tcphdr *)0, NULL, 0, + (void) tcp_reass(tp, (struct tcphdr *)0, NULL, 0, (struct mbuf *)0); tp->snd_wl1 = th->th_seq - 1; + /* For syn-recv we need to possibly update the rtt */ + if ((to->to_flags & TOF_TS) != 0 && to->to_tsecr) { + uint32_t t; + + t = tcp_ts_getticks() - to->to_tsecr; + if (!tp->t_rttlow || tp->t_rttlow > t) + tp->t_rttlow = t; + tcp_rack_xmit_timer(rack, t + 1); + tcp_rack_xmit_timer_commit(rack, tp); + } if (rack_process_ack(m, th, so, tp, to, tiwin, tlen, &ourfinisacked, thflags, &ret_val)) { return (ret_val); } @@ -5735,17 +6663,18 @@ rack_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, } } } - rack_calc_rwin(so, tp); + ctf_calc_rwin(so, tp); - if (thflags & TH_RST) - return (rack_process_rst(m, th, so, tp)); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); /* * RFC5961 Section 4.2 Send challenge ACK for any SYN in * synchronized state. */ if (thflags & TH_SYN) { - rack_challenge_ack(m, th, tp, &ret_val); + ctf_challenge_ack(m, th, tp, &ret_val); return (ret_val); } /* @@ -5754,10 +6683,10 @@ rack_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, */ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && TSTMP_LT(to->to_tsval, tp->ts_recent)) { - if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val)) + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) return (ret_val); } - if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { return (ret_val); } /* @@ -5793,10 +6722,11 @@ rack_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, tiwin, thflags, nxt_pkt)); } else if (tp->t_flags & TF_ACKNOW) { - rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++; return (ret_val); } else { - rack_do_drop(m, NULL); + ctf_do_drop(m, NULL); return (0); } } @@ -5809,7 +6739,7 @@ rack_do_established(struct mbuf *m, struct tcphdr *th, struct socket *so, if (sbavail(&so->so_snd)) { if (rack_progress_timeout_check(tp)) { tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT); - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } } @@ -5830,15 +6760,16 @@ rack_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, { int32_t ret_val = 0; - rack_calc_rwin(so, tp); - if (thflags & TH_RST) - return (rack_process_rst(m, th, so, tp)); + ctf_calc_rwin(so, tp); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); /* * RFC5961 Section 4.2 Send challenge ACK for any SYN in * synchronized state. */ if (thflags & TH_SYN) { - rack_challenge_ack(m, th, tp, &ret_val); + ctf_challenge_ack(m, th, tp, &ret_val); return (ret_val); } /* @@ -5847,10 +6778,10 @@ rack_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, */ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && TSTMP_LT(to->to_tsval, tp->ts_recent)) { - if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val)) + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) return (ret_val); } - if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { return (ret_val); } /* @@ -5885,10 +6816,11 @@ rack_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, tiwin, thflags, nxt_pkt)); } else if (tp->t_flags & TF_ACKNOW) { - rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++; return (ret_val); } else { - rack_do_drop(m, NULL); + ctf_do_drop(m, NULL); return (0); } } @@ -5901,7 +6833,7 @@ rack_do_close_wait(struct mbuf *m, struct tcphdr *th, struct socket *so, if (sbavail(&so->so_snd)) { if (rack_progress_timeout_check(tp)) { tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT); - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } } @@ -5913,7 +6845,7 @@ static int rack_check_data_after_close(struct mbuf *m, struct tcpcb *tp, int32_t *tlen, struct tcphdr *th, struct socket *so) { - struct tcp_rack *rack; + struct tcp_rack *rack; INP_INFO_RLOCK_ASSERT(&V_tcbinfo); rack = (struct tcp_rack *)tp->t_fb_ptr; @@ -5921,7 +6853,7 @@ rack_check_data_after_close(struct mbuf *m, close_now: tp = tcp_close(tp); TCPSTAT_INC(tcps_rcvafterclose); - rack_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen)); + ctf_do_dropwithreset(m, tp, th, BANDLIM_UNLIMITED, (*tlen)); return (1); } if (sbavail(&so->so_snd) == 0) @@ -5947,16 +6879,17 @@ rack_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so, int32_t ret_val = 0; int32_t ourfinisacked = 0; - rack_calc_rwin(so, tp); + ctf_calc_rwin(so, tp); - if (thflags & TH_RST) - return (rack_process_rst(m, th, so, tp)); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); /* * RFC5961 Section 4.2 Send challenge ACK for any SYN in * synchronized state. */ if (thflags & TH_SYN) { - rack_challenge_ack(m, th, tp, &ret_val); + ctf_challenge_ack(m, th, tp, &ret_val); return (ret_val); } /* @@ -5965,10 +6898,10 @@ rack_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so, */ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && TSTMP_LT(to->to_tsval, tp->ts_recent)) { - if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val)) + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) return (ret_val); } - if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { return (ret_val); } /* @@ -6010,10 +6943,11 @@ rack_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so, return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen, tiwin, thflags, nxt_pkt)); } else if (tp->t_flags & TF_ACKNOW) { - rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++; return (ret_val); } else { - rack_do_drop(m, NULL); + ctf_do_drop(m, NULL); return (0); } } @@ -6045,7 +6979,7 @@ rack_do_fin_wait_1(struct mbuf *m, struct tcphdr *th, struct socket *so, if (sbavail(&so->so_snd)) { if (rack_progress_timeout_check(tp)) { tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT); - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } } @@ -6066,16 +7000,17 @@ rack_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, int32_t ret_val = 0; int32_t ourfinisacked = 0; - rack_calc_rwin(so, tp); + ctf_calc_rwin(so, tp); - if (thflags & TH_RST) - return (rack_process_rst(m, th, so, tp)); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); /* * RFC5961 Section 4.2 Send challenge ACK for any SYN in * synchronized state. */ if (thflags & TH_SYN) { - rack_challenge_ack(m, th, tp, &ret_val); + ctf_challenge_ack(m, th, tp, &ret_val); return (ret_val); } /* @@ -6084,10 +7019,10 @@ rack_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, */ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && TSTMP_LT(to->to_tsval, tp->ts_recent)) { - if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val)) + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) return (ret_val); } - if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { return (ret_val); } /* @@ -6129,10 +7064,11 @@ rack_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen, tiwin, thflags, nxt_pkt)); } else if (tp->t_flags & TF_ACKNOW) { - rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++; return (ret_val); } else { - rack_do_drop(m, NULL); + ctf_do_drop(m, NULL); return (0); } } @@ -6151,7 +7087,7 @@ rack_do_closing(struct mbuf *m, struct tcphdr *th, struct socket *so, if (sbavail(&so->so_snd)) { if (rack_progress_timeout_check(tp)) { tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT); - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } } @@ -6172,16 +7108,17 @@ rack_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so, int32_t ret_val = 0; int32_t ourfinisacked = 0; - rack_calc_rwin(so, tp); + ctf_calc_rwin(so, tp); - if (thflags & TH_RST) - return (rack_process_rst(m, th, so, tp)); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); /* * RFC5961 Section 4.2 Send challenge ACK for any SYN in * synchronized state. */ if (thflags & TH_SYN) { - rack_challenge_ack(m, th, tp, &ret_val); + ctf_challenge_ack(m, th, tp, &ret_val); return (ret_val); } /* @@ -6190,10 +7127,10 @@ rack_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so, */ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && TSTMP_LT(to->to_tsval, tp->ts_recent)) { - if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val)) + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) return (ret_val); } - if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { return (ret_val); } /* @@ -6235,10 +7172,11 @@ rack_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so, return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen, tiwin, thflags, nxt_pkt)); } else if (tp->t_flags & TF_ACKNOW) { - rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++; return (ret_val); } else { - rack_do_drop(m, NULL); + ctf_do_drop(m, NULL); return (0); } } @@ -6251,13 +7189,13 @@ rack_do_lastack(struct mbuf *m, struct tcphdr *th, struct socket *so, if (ourfinisacked) { INP_INFO_RLOCK_ASSERT(&V_tcbinfo); tp = tcp_close(tp); - rack_do_drop(m, tp); + ctf_do_drop(m, tp); return (1); } if (sbavail(&so->so_snd)) { if (rack_progress_timeout_check(tp)) { tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT); - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } } @@ -6279,17 +7217,18 @@ rack_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so, int32_t ret_val = 0; int32_t ourfinisacked = 0; - rack_calc_rwin(so, tp); + ctf_calc_rwin(so, tp); /* Reset receive buffer auto scaling when not in bulk receive mode. */ - if (thflags & TH_RST) - return (rack_process_rst(m, th, so, tp)); + if ((thflags & TH_RST) || + (tp->t_fin_is_rst && (thflags & TH_FIN))) + return (ctf_process_rst(m, th, so, tp)); /* * RFC5961 Section 4.2 Send challenge ACK for any SYN in * synchronized state. */ if (thflags & TH_SYN) { - rack_challenge_ack(m, th, tp, &ret_val); + ctf_challenge_ack(m, th, tp, &ret_val); return (ret_val); } /* @@ -6298,10 +7237,10 @@ rack_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so, */ if ((to->to_flags & TOF_TS) != 0 && tp->ts_recent && TSTMP_LT(to->to_tsval, tp->ts_recent)) { - if (rack_ts_check(m, th, tp, tlen, thflags, &ret_val)) + if (ctf_ts_check(m, th, tp, tlen, thflags, &ret_val)) return (ret_val); } - if (rack_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { + if (ctf_drop_checks(to, m, th, tp, &tlen, &thflags, &drop_hdrlen, &ret_val)) { return (ret_val); } /* @@ -6344,10 +7283,11 @@ rack_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so, return (rack_process_data(m, th, so, tp, drop_hdrlen, tlen, tiwin, thflags, nxt_pkt)); } else if (tp->t_flags & TF_ACKNOW) { - rack_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ctf_do_dropafterack(m, tp, th, thflags, tlen, &ret_val); + ((struct tcp_rack *)tp->t_fb_ptr)->r_wanted_output++; return (ret_val); } else { - rack_do_drop(m, NULL); + ctf_do_drop(m, NULL); return (0); } } @@ -6360,7 +7300,7 @@ rack_do_fin_wait_2(struct mbuf *m, struct tcphdr *th, struct socket *so, if (sbavail(&so->so_snd)) { if (rack_progress_timeout_check(tp)) { tcp_set_inp_to_drop(tp->t_inpcb, ETIMEDOUT); - rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); return (1); } } @@ -6377,10 +7317,43 @@ rack_clear_rate_sample(struct tcp_rack *rack) rack->r_ctl.rack_rs.rs_rtt_tot = 0; } +static void +rack_set_pace_segments(struct tcpcb *tp, struct tcp_rack *rack) +{ + uint32_t tls_seg = 0; + +#ifdef KERN_TLS + if (rack->rc_inp->inp_socket->so_snd.sb_flags & SB_TLS_IFNET) { + tls_seg = ctf_get_opt_tls_size(rack->rc_inp->inp_socket, rack->rc_tp->snd_wnd); + rack->r_ctl.rc_pace_min_segs = tls_seg; + } else +#endif + rack->r_ctl.rc_pace_min_segs = ctf_fixed_maxseg(tp); + rack->r_ctl.rc_pace_max_segs = ctf_fixed_maxseg(tp) * rack->rc_pace_max_segs; + if (rack->r_ctl.rc_pace_max_segs > PACE_MAX_IP_BYTES) + rack->r_ctl.rc_pace_max_segs = PACE_MAX_IP_BYTES; +#ifdef KERN_TLS + if (tls_seg != 0) { + if (rack_hw_tls_max_seg > 1) { + rack->r_ctl.rc_pace_max_segs /= tls_seg; + if (rack_hw_tls_max_seg < rack->r_ctl.rc_pace_max_segs) + rack->r_ctl.rc_pace_max_segs = rack_hw_tls_max_seg; + } else { + rack->r_ctl.rc_pace_max_segs = 1; + } + if (rack->r_ctl.rc_pace_max_segs == 0) + rack->r_ctl.rc_pace_max_segs = 1; + rack->r_ctl.rc_pace_max_segs *= tls_seg; + } +#endif + rack_log_type_hrdwtso(tp, rack, tls_seg, rack->rc_inp->inp_socket->so_snd.sb_flags, 0, 2); +} + static int rack_init(struct tcpcb *tp) { struct tcp_rack *rack = NULL; + struct rack_sendmap *insret; tp->t_fb_ptr = uma_zalloc(rack_pcb_zone, M_NOWAIT); if (tp->t_fb_ptr == NULL) { @@ -6395,13 +7368,14 @@ rack_init(struct tcpcb *tp) memset(tp->t_fb_ptr, 0, sizeof(struct tcp_rack)); rack = (struct tcp_rack *)tp->t_fb_ptr; - TAILQ_INIT(&rack->r_ctl.rc_map); + RB_INIT(&rack->r_ctl.rc_mtree); TAILQ_INIT(&rack->r_ctl.rc_free); TAILQ_INIT(&rack->r_ctl.rc_tmap); rack->rc_tp = tp; if (tp->t_inpcb) { rack->rc_inp = tp->t_inpcb; } + tp->t_inpcb->inp_flags2 |= INP_SUPPORTS_MBUFQ; /* Probably not needed but lets be sure */ rack_clear_rate_sample(rack); rack->r_cpu = 0; @@ -6409,27 +7383,36 @@ rack_init(struct tcpcb *tp) rack->rc_allow_data_af_clo = rack_ignore_data_after_close; rack->r_ctl.rc_tlp_threshold = rack_tlp_thresh; rack->rc_pace_reduce = rack_slot_reduction; + if (use_rack_cheat) + rack->use_rack_cheat = 1; if (V_tcp_delack_enabled) tp->t_delayed_ack = 1; else tp->t_delayed_ack = 0; rack->rc_pace_max_segs = rack_hptsi_segments; - rack->r_ctl.rc_early_recovery_segs = rack_early_recovery_max_seg; rack->r_ctl.rc_reorder_shift = rack_reorder_thresh; rack->r_ctl.rc_pkt_delay = rack_pkt_delay; rack->r_ctl.rc_prop_reduce = rack_use_proportional_reduce; - rack->r_idle_reduce_largest = rack_reduce_largest_on_idle; rack->r_enforce_min_pace = rack_min_pace_time; - rack->r_min_pace_seg_thresh = rack_min_pace_time_seg_req; rack->r_ctl.rc_prop_rate = rack_proportional_rate; rack->r_ctl.rc_tlp_cwnd_reduce = rack_lower_cwnd_at_tlp; rack->r_ctl.rc_early_recovery = rack_early_recovery; rack->rc_always_pace = rack_pace_every_seg; + rack_set_pace_segments(tp, rack); + rack->r_ctl.rc_high_rwnd = tp->snd_wnd; rack->r_ctl.rc_rate_sample_method = rack_rate_sample_method; rack->rack_tlp_threshold_use = rack_tlp_threshold_use; rack->r_ctl.rc_prr_sendalot = rack_send_a_lot_in_prr; rack->r_ctl.rc_min_to = rack_min_to; - rack->r_ctl.rc_prr_inc_var = rack_inc_var; + rack->rack_per_of_gp = rack_per_of_gp; + microuptime(&rack->r_ctl.rc_last_ack); + rack->r_ctl.rc_last_time_decay = rack->r_ctl.rc_last_ack; + rack->r_ctl.rc_tlp_rxt_last_time = tcp_ts_getticks(); + /* Do we force on detection? */ + if (tcp_force_detection) + rack->do_detection = 1; + else + rack->do_detection = 0; if (tp->snd_una != tp->snd_max) { /* Create a send map for the current outstanding data */ struct rack_sendmap *rsm; @@ -6441,18 +7424,24 @@ rack_init(struct tcpcb *tp) return (ENOMEM); } rsm->r_flags = RACK_OVERMAX; - rsm->r_tim_lastsent[0] = tcp_ts_getticks(); + rsm->r_tim_lastsent[0] = rack->r_ctl.rc_tlp_rxt_last_time; rsm->r_rtr_cnt = 1; rsm->r_rtr_bytes = 0; rsm->r_start = tp->snd_una; rsm->r_end = tp->snd_max; - rsm->r_sndcnt = 0; - TAILQ_INSERT_TAIL(&rack->r_ctl.rc_map, rsm, r_next); + rsm->r_dupack = 0; + insret = RB_INSERT(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); +#ifdef INVARIANTS + if (insret != NULL) { + panic("Insert in rb tree fails ret:%p rack:%p rsm:%p", + insret, rack, rsm); + } +#endif TAILQ_INSERT_TAIL(&rack->r_ctl.rc_tmap, rsm, r_tnext); rsm->r_in_tmap = 1; } rack_stop_all_timers(tp); - rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), __LINE__, 0, 0, 0); + rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0); return (0); } @@ -6472,7 +7461,7 @@ rack_handoff_ok(struct tcpcb *tp) */ return (EAGAIN); } - if (tp->t_flags & TF_SACK_PERMIT) { + if ((tp->t_flags & TF_SACK_PERMIT) || rack_sack_not_required){ return (0); } /* @@ -6487,21 +7476,28 @@ rack_fini(struct tcpcb *tp, int32_t tcb_is_purged) { if (tp->t_fb_ptr) { struct tcp_rack *rack; - struct rack_sendmap *rsm; - + struct rack_sendmap *rsm, *nrsm, *rm; + if (tp->t_inpcb) { + tp->t_inpcb->inp_flags2 &= ~INP_SUPPORTS_MBUFQ; + tp->t_inpcb->inp_flags2 &= ~INP_MBUF_QUEUE_READY; + } rack = (struct tcp_rack *)tp->t_fb_ptr; #ifdef TCP_BLACKBOX tcp_log_flowend(tp); #endif - rsm = TAILQ_FIRST(&rack->r_ctl.rc_map); - while (rsm) { - TAILQ_REMOVE(&rack->r_ctl.rc_map, rsm, r_next); + RB_FOREACH_SAFE(rsm, rack_rb_tree_head, &rack->r_ctl.rc_mtree, nrsm) { + rm = RB_REMOVE(rack_rb_tree_head, &rack->r_ctl.rc_mtree, rsm); +#ifdef INVARIANTS + if (rm != rsm) { + panic("At fini, rack:%p rsm:%p rm:%p", + rack, rsm, rm); + } +#endif uma_zfree(rack_zone, rsm); - rsm = TAILQ_FIRST(&rack->r_ctl.rc_map); } rsm = TAILQ_FIRST(&rack->r_ctl.rc_free); while (rsm) { - TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_next); + TAILQ_REMOVE(&rack->r_ctl.rc_free, rsm, r_tnext); uma_zfree(rack_zone, rsm); rsm = TAILQ_FIRST(&rack->r_ctl.rc_free); } @@ -6513,6 +7509,7 @@ rack_fini(struct tcpcb *tp, int32_t tcb_is_purged) tp->snd_nxt = tp->snd_max; } + static void rack_set_state(struct tcpcb *tp, struct tcp_rack *rack) { @@ -6526,6 +7523,7 @@ rack_set_state(struct tcpcb *tp, struct tcp_rack *rack) rack->r_substate = rack_do_syn_recv; break; case TCPS_ESTABLISHED: + rack_set_pace_segments(tp, rack); rack->r_state = TCPS_ESTABLISHED; rack->r_substate = rack_do_established; break; @@ -6600,21 +7598,13 @@ rack_timer_audit(struct tcpcb *tp, struct tcp_rack *rack, struct sockbuf *sb) return; } } - if (rsm && (rsm->r_flags & RACK_SACK_PASSED)) { - if ((tp->t_flags & TF_SENTFIN) && - ((tp->snd_max - tp->snd_una) == 1) && - (rsm->r_flags & RACK_HAS_FIN)) { - /* needs to be a RXT */ - if (tmr_up == PACE_TMR_RXT) - return; - } else if (tmr_up == PACE_TMR_RACK) - return; - } else if (SEQ_GT(tp->snd_max,tp->snd_una) && + if (SEQ_GT(tp->snd_max, tp->snd_una) && ((tmr_up == PACE_TMR_TLP) || + (tmr_up == PACE_TMR_RACK) || (tmr_up == PACE_TMR_RXT))) { /* - * Either a TLP or RXT is fine if no sack-passed - * is in place and data is outstanding. + * Either a Rack, TLP or RXT is fine if we + * have outstanding data. */ return; } else if (tmr_up == PACE_TMR_DELACK) { @@ -6633,11 +7623,11 @@ rack_timer_audit(struct tcpcb *tp, struct tcp_rack *rack, struct sockbuf *sb) * with the slot set to what was in the saved slot. */ rack_timer_cancel(tp, rack, rack->r_ctl.rc_rcvtime, __LINE__); - rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), __LINE__, 0, 0, 0); + rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0); } -static void -rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, +static int +rack_do_segment_nounlock(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos, int32_t nxt_pkt, struct timeval *tv) { @@ -6650,6 +7640,10 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, struct rack_sendmap *rsm; int32_t prev_state = 0; + if (m->m_flags & M_TSTMP_LRO) { + tv->tv_sec = m->m_pkthdr.rcv_tstmp /1000000000; + tv->tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000; + } cts = tcp_tv_to_mssectick(tv); rack = (struct tcp_rack *)tp->t_fb_ptr; @@ -6662,34 +7656,55 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, * allow the tcbinfo to be in either locked or unlocked, as the * caller may have unnecessarily acquired a lock due to a race. */ + if ((thflags & (TH_SYN | TH_FIN | TH_RST)) != 0 || + tp->t_state != TCPS_ESTABLISHED) { + INP_INFO_RLOCK_ASSERT(&V_tcbinfo); + } INP_WLOCK_ASSERT(tp->t_inpcb); KASSERT(tp->t_state > TCPS_LISTEN, ("%s: TCPS_LISTEN", __func__)); KASSERT(tp->t_state != TCPS_TIME_WAIT, ("%s: TCPS_TIME_WAIT", __func__)); - { + if (tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; log.u_bbr.ininput = rack->rc_inp->inp_in_input; + log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt; log.u_bbr.flex2 = rack->r_ctl.rc_num_maps_alloced; - TCP_LOG_EVENT(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_IN, 0, - tlen, &log, true); + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); + log.u_bbr.pkts_out = rack->rc_tp->t_maxseg; + TCP_LOG_EVENTP(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_IN, 0, + tlen, &log, true, &tv); + } + if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) { + way_out = 4; + retval = 0; + goto done_with_input; + } + /* + * If a segment with the ACK-bit set arrives in the SYN-SENT state + * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9. + */ + if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) && + (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) { + ctf_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return(1); } /* * Segment received on connection. Reset idle time and keep-alive * timer. XXX: This should be done after segment validation to * ignore broken/spoofed segs. */ - if (tp->t_idle_reduce && (tp->snd_max == tp->snd_una)) { - if ((ticks - tp->t_rcvtime) >= tp->t_rxtcur) { - counter_u64_add(rack_input_idle_reduces, 1); - rack_cc_after_idle(tp, - (rack->r_idle_reduce_largest ? 1 :0)); - } + if (tp->t_idle_reduce && + (tp->snd_max == tp->snd_una) && + ((ticks - tp->t_rcvtime) >= tp->t_rxtcur)) { + counter_u64_add(rack_input_idle_reduces, 1); + rack_cc_after_idle(tp); } - rack->r_ctl.rc_rcvtime = cts; tp->t_rcvtime = ticks; /* @@ -6700,6 +7715,8 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, #ifdef NETFLIX_STATS stats_voi_update_abs_ulong(tp->t_stats, VOI_TCP_FRWIN, tiwin); #endif + if (tiwin > rack->r_ctl.rc_high_rwnd) + rack->r_ctl.rc_high_rwnd = tiwin; /* * TCP ECN processing. XXXJTL: If we ever use ECN, we need to move * this to occur after we've validated the segment. @@ -6782,6 +7799,22 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, if ((tp->t_flags & TF_SACK_PERMIT) && (to.to_flags & TOF_SACKPERM) == 0) tp->t_flags &= ~TF_SACK_PERMIT; + if (IS_FASTOPEN(tp->t_flags)) { + if (to.to_flags & TOF_FASTOPEN) { + uint16_t mss; + + if (to.to_flags & TOF_MSS) + mss = to.to_mss; + else + if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) + mss = TCP6_MSS; + else + mss = TCP_MSS; + tcp_fastopen_update_cache(tp, mss, + to.to_tfo_len, to.to_tfo_cookie); + } else + tcp_fastopen_disable_path(tp); + } } /* * At this point we are at the initial call. Here we decide @@ -6793,7 +7826,7 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, tcp_switch_back_to_default(tp); (*tp->t_fb->tfb_tcp_do_segment) (m, th, so, tp, drop_hdrlen, tlen, iptos); - return; + return (1); } /* Set the flag */ rack->r_is_v6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0; @@ -6805,9 +7838,12 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, * always. All other times (timers etc) we must have a rack-state * set (so we assure we have done the checks above for SACK). */ + memcpy(&rack->r_ctl.rc_last_ack, tv, sizeof(struct timeval)); + rack->r_ctl.rc_rcvtime = cts; if (rack->r_state != tp->t_state) rack_set_state(tp, rack); - if (SEQ_GT(th->th_ack, tp->snd_una) && (rsm = TAILQ_FIRST(&rack->r_ctl.rc_map)) != NULL) + if (SEQ_GT(th->th_ack, tp->snd_una) && + (rsm = RB_MIN(rack_rb_tree_head, &rack->r_ctl.rc_mtree)) != NULL) kern_prefetch(rsm, &prev_state); prev_state = rack->r_state; rack->r_ctl.rc_tlp_send_cnt = 0; @@ -6828,15 +7864,24 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, * is gone. */ INP_WLOCK_ASSERT(tp->t_inpcb); + if (rack->set_pacing_done_a_iw == 0) { + /* How much has been acked? */ + if ((tp->snd_una - tp->iss) > (ctf_fixed_maxseg(tp) * 10)) { + /* We have enough to set in the pacing segment size */ + rack->set_pacing_done_a_iw = 1; + rack_set_pace_segments(tp, rack); + } + } tcp_rack_xmit_timer_commit(rack, tp); - if (nxt_pkt == 0) { + if ((nxt_pkt == 0) || (IN_RECOVERY(tp->t_flags))) { if (rack->r_wanted_output != 0) { did_out = 1; (void)tp->t_fb->tfb_tcp_output(tp); } - rack_start_hpts_timer(rack, tp, cts, __LINE__, 0, 0, 0); + rack_start_hpts_timer(rack, tp, cts, 0, 0, 0); } - if (((rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) && + if ((nxt_pkt == 0) && + ((rack->r_ctl.rc_hpts_flags & PACE_TMR_MASK) == 0) && (SEQ_GT(tp->snd_max, tp->snd_una) || (tp->t_flags & TF_DELACK) || ((tcp_always_keepalive || rack->rc_inp->inp_socket->so_options & SO_KEEPALIVE) && @@ -6844,20 +7889,24 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, /* We could not send (probably in the hpts but stopped the timer earlier)? */ if ((tp->snd_max == tp->snd_una) && ((tp->t_flags & TF_DELACK) == 0) && + (rack->rc_inp->inp_in_hpts) && (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT)) { /* keep alive not needed if we are hptsi output yet */ ; } else { - if (rack->rc_inp->inp_in_hpts) + if (rack->rc_inp->inp_in_hpts) { tcp_hpts_remove(rack->rc_inp, HPTS_REMOVE_OUTPUT); - rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), __LINE__, 0, 0, 0); + counter_u64_add(rack_per_timer_hole, 1); + } + rack_start_hpts_timer(rack, tp, tcp_ts_getticks(), 0, 0, 0); } way_out = 1; - } else { + } else if (nxt_pkt == 0) { /* Do we have the correct timer running? */ rack_timer_audit(tp, rack, &so->so_snd); way_out = 2; } + done_with_input: rack_log_doseg_done(rack, cts, nxt_pkt, did_out, way_out); if (did_out) rack->r_wanted_output = 0; @@ -6868,8 +7917,8 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, retval, tp, prev_state); } #endif - INP_WUNLOCK(tp->t_inpcb); } + return (retval); } void @@ -6877,29 +7926,24 @@ rack_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, struct tcpcb *tp, int32_t drop_hdrlen, int32_t tlen, uint8_t iptos) { struct timeval tv; -#ifdef RSS - struct tcp_function_block *tfb; - struct tcp_rack *rack; - struct inpcb *inp; - rack = (struct tcp_rack *)tp->t_fb_ptr; - if (rack->r_state == 0) { - /* - * Initial input (ACK to SYN-ACK etc)lets go ahead and get - * it processed - */ + /* First lets see if we have old packets */ + if (tp->t_in_pkt) { + if (ctf_do_queued_segments(so, tp, 1)) { + m_freem(m); + return; + } + } + if (m->m_flags & M_TSTMP_LRO) { + tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000; + tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000; + } else { + /* Should not be should we kassert instead? */ tcp_get_usecs(&tv); - rack_hpts_do_segment(m, th, so, tp, drop_hdrlen, - tlen, iptos, 0, &tv); - return; } - tcp_queue_to_input(tp, m, th, tlen, drop_hdrlen, iptos); - INP_WUNLOCK(tp->t_inpcb); -#else - tcp_get_usecs(&tv); - rack_hpts_do_segment(m, th, so, tp, drop_hdrlen, - tlen, iptos, 0, &tv); -#endif + if(rack_do_segment_nounlock(m, th, so, tp, + drop_hdrlen, tlen, iptos, 0, &tv) == 0) + INP_WUNLOCK(tp->t_inpcb); } struct rack_sendmap * @@ -6907,10 +7951,10 @@ tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack, uint32_t tsused) { struct rack_sendmap *rsm = NULL; int32_t idx; - uint32_t srtt_cur, srtt = 0, thresh = 0, ts_low = 0; + uint32_t srtt = 0, thresh = 0, ts_low = 0; /* Return the next guy to be re-transmitted */ - if (TAILQ_EMPTY(&rack->r_ctl.rc_map)) { + if (RB_EMPTY(&rack->r_ctl.rc_mtree)) { return (NULL); } if (tp->t_flags & TF_SENTFIN) { @@ -6927,10 +7971,6 @@ tcp_rack_output(struct tcpcb *tp, struct tcp_rack *rack, uint32_t tsused) return (NULL); } check_it: - srtt_cur = tp->t_srtt >> TCP_RTT_SHIFT; - srtt = TICKS_2_MSEC(srtt_cur); - if (rack->rc_rack_rtt && (srtt > rack->rc_rack_rtt)) - srtt = rack->rc_rack_rtt; if (rsm->r_flags & RACK_ACKED) { return (NULL); } @@ -6938,18 +7978,133 @@ check_it: /* Its not yet ready */ return (NULL); } + srtt = rack_grab_rtt(tp, rack); idx = rsm->r_rtr_cnt - 1; ts_low = rsm->r_tim_lastsent[idx]; thresh = rack_calc_thresh_rack(rack, srtt, tsused); - if (tsused <= ts_low) { + if ((tsused == ts_low) || + (TSTMP_LT(tsused, ts_low))) { + /* No time since sending */ + return (NULL); + } + if ((tsused - ts_low) < thresh) { + /* It has not been long enough yet */ return (NULL); } - if ((tsused - ts_low) >= thresh) { + if ((rsm->r_dupack >= DUP_ACK_THRESHOLD) || + ((rsm->r_flags & RACK_SACK_PASSED) && + (rack->sack_attack_disable == 0))) { + /* + * We have passed the dup-ack threshold <or> + * a SACK has indicated this is missing. + * Note that if you are a declared attacker + * it is only the dup-ack threshold that + * will cause retransmits. + */ + /* log retransmit reason */ + rack_log_retran_reason(rack, rsm, (tsused - ts_low), thresh, 1); return (rsm); } return (NULL); } +static int32_t +rack_get_pacing_delay(struct tcp_rack *rack, struct tcpcb *tp, uint32_t len) +{ + int32_t slot = 0; + + if ((rack->rack_per_of_gp == 0) || + (rack->rc_always_pace == 0)) { + /* + * We use the most optimistic possible cwnd/srtt for + * sending calculations. This will make our + * calculation anticipate getting more through + * quicker then possible. But thats ok we don't want + * the peer to have a gap in data sending. + */ + uint32_t srtt, cwnd, tr_perms = 0; + +old_method: + if (rack->r_ctl.rc_rack_min_rtt) + srtt = rack->r_ctl.rc_rack_min_rtt; + else + srtt = TICKS_2_MSEC((tp->t_srtt >> TCP_RTT_SHIFT)); + if (rack->r_ctl.rc_rack_largest_cwnd) + cwnd = rack->r_ctl.rc_rack_largest_cwnd; + else + cwnd = tp->snd_cwnd; + tr_perms = cwnd / srtt; + if (tr_perms == 0) { + tr_perms = ctf_fixed_maxseg(tp); + } + /* + * Calculate how long this will take to drain, if + * the calculation comes out to zero, thats ok we + * will use send_a_lot to possibly spin around for + * more increasing tot_len_this_send to the point + * that its going to require a pace, or we hit the + * cwnd. Which in that case we are just waiting for + * a ACK. + */ + slot = len / tr_perms; + /* Now do we reduce the time so we don't run dry? */ + if (slot && rack->rc_pace_reduce) { + int32_t reduce; + + reduce = (slot / rack->rc_pace_reduce); + if (reduce < slot) { + slot -= reduce; + } else + slot = 0; + } + } else { + int cnt; + uint64_t bw_est, bw_raise, res, lentim; + + bw_est = 0; + for (cnt=0; cnt<RACK_GP_HIST; cnt++) { + if ((rack->r_ctl.rc_gp_hist_filled == 0) && + (rack->r_ctl.rc_gp_history[cnt] == 0)) + break; + bw_est += rack->r_ctl.rc_gp_history[cnt]; + } + if (bw_est == 0) { + /* + * No way yet to make a b/w estimate + * (no goodput est yet). + */ + goto old_method; + } + /* Covert to bytes per second */ + bw_est *= MSEC_IN_SECOND; + /* + * Now ratchet it up by our percentage. Note + * that the minimum you can do is 1 which would + * get you 101% of the average last N goodput estimates. + * The max you can do is 256 which would yeild you + * 356% of the last N goodput estimates. + */ + bw_raise = bw_est * (uint64_t)rack->rack_per_of_gp; + bw_est += bw_raise; + /* average by the number we added */ + bw_est /= cnt; + /* Now calculate a rate based on this b/w */ + lentim = (uint64_t) len * (uint64_t)MSEC_IN_SECOND; + res = lentim / bw_est; + slot = (uint32_t)res; + } + if (rack->r_enforce_min_pace && + (slot == 0)) { + /* We are enforcing a minimum pace time of 1ms */ + slot = rack->r_enforce_min_pace; + } + if (slot) + counter_u64_add(rack_calc_nonzero, 1); + else + counter_u64_add(rack_calc_zero, 1); + return (slot); +} + static int rack_output(struct tcpcb *tp) { @@ -6961,22 +8116,19 @@ rack_output(struct tcpcb *tp) struct mbuf *mb; uint32_t if_hw_tsomaxsegcount = 0; uint32_t if_hw_tsomaxsegsize; + int32_t maxseg; long tot_len_this_send = 0; struct ip *ip = NULL; #ifdef TCPDEBUG struct ipovly *ipov = NULL; #endif -#ifdef NETFLIX_TCP_O_UDP struct udphdr *udp = NULL; -#endif struct tcp_rack *rack; struct tcphdr *th; uint8_t pass = 0; + uint8_t wanted_cookie = 0; u_char opt[TCP_MAXOLEN]; - unsigned ipoptlen, optlen, hdrlen; -#ifdef NETFLIX_TCP_O_UDP - unsigned ulen; -#endif + unsigned ipoptlen, optlen, hdrlen, ulen=0; uint32_t rack_seq; #if defined(IPSEC) || defined(IPSEC_SUPPORT) @@ -6987,13 +8139,16 @@ rack_output(struct tcpcb *tp) int32_t sub_from_prr = 0; volatile int32_t sack_rxmit; struct rack_sendmap *rsm = NULL; - int32_t tso, mtu, would_have_fin = 0; + int32_t tso, mtu; struct tcpopt to; int32_t slot = 0; + int32_t sup_rack = 0; uint32_t cts; - uint8_t hpts_calling, doing_tlp = 0; + uint8_t hpts_calling, new_data_tlp = 0, doing_tlp = 0; int32_t do_a_prefetch; int32_t prefetch_rsm = 0; + int force_tso = 0; + int32_t orig_len; int32_t prefetch_so_done = 0; struct tcp_log_buffer *lgb = NULL; struct inpcb *inp; @@ -7002,11 +8157,8 @@ rack_output(struct tcpcb *tp) struct ip6_hdr *ip6 = NULL; int32_t isipv6; #endif -#ifdef KERN_TLS - const bool hw_tls = (so->so_snd.sb_flags & SB_TLS_IFNET) != 0; -#else - const bool hw_tls = false; -#endif + uint8_t filled_all = 0; + bool hw_tls = false; /* setup and take the cache hits here */ rack = (struct tcp_rack *)tp->t_fb_ptr; @@ -7015,24 +8167,26 @@ rack_output(struct tcpcb *tp) sb = &so->so_snd; kern_prefetch(sb, &do_a_prefetch); do_a_prefetch = 1; + +#ifdef KERN_TLS + hw_tls = (so->so_snd.sb_flags & SB_TLS_IFNET) != 0; +#endif INP_WLOCK_ASSERT(inp); #ifdef TCP_OFFLOAD if (tp->t_flags & TF_TOE) return (tcp_offload_output(tp)); #endif - -#ifdef TCP_RFC7413 + maxseg = ctf_fixed_maxseg(tp); /* * For TFO connections in SYN_RECEIVED, only allow the initial * SYN|ACK and those sent by the retransmit timer. */ - if ((tp->t_flags & TF_FASTOPEN) && + if (IS_FASTOPEN(tp->t_flags) && (tp->t_state == TCPS_SYN_RECEIVED) && - SEQ_GT(tp->snd_max, tp->snd_una) && /* inital SYN|ACK sent */ - (tp->snd_nxt != tp->snd_una)) /* not a retransmit */ + SEQ_GT(tp->snd_max, tp->snd_una) && /* initial SYN|ACK sent */ + (rack->r_ctl.rc_resend == NULL)) /* not a retransmit */ return (0); -#endif #ifdef INET6 if (rack->r_state) { /* Use the cache line loaded if possible */ @@ -7075,6 +8229,17 @@ rack_output(struct tcpcb *tp) rack->r_wanted_output = 0; rack->r_timer_override = 0; /* + * For TFO connections in SYN_SENT or SYN_RECEIVED, + * only allow the initial SYN or SYN|ACK and those sent + * by the retransmit timer. + */ + if (IS_FASTOPEN(tp->t_flags) && + ((tp->t_state == TCPS_SYN_RECEIVED) || + (tp->t_state == TCPS_SYN_SENT)) && + SEQ_GT(tp->snd_max, tp->snd_una) && /* initial SYN or SYN|ACK sent */ + (tp->t_rxtshift == 0)) /* not a retransmit */ + return (0); + /* * Determine length of data that should be transmitted, and flags * that will be used. If there is some data or critical controls * (SYN, RST) to send, then transmit; otherwise, investigate @@ -7083,8 +8248,7 @@ rack_output(struct tcpcb *tp) idle = (tp->t_flags & TF_LASTIDLE) || (tp->snd_max == tp->snd_una); if (tp->t_idle_reduce) { if (idle && ((ticks - tp->t_rcvtime) >= tp->t_rxtcur)) - rack_cc_after_idle(tp, - (rack->r_idle_reduce_largest ? 1 :0)); + rack_cc_after_idle(tp); } tp->t_flags &= ~TF_LASTIDLE; if (idle) { @@ -7107,17 +8271,6 @@ again: sendwin = min(tp->snd_wnd, tp->snd_cwnd); flags = tcp_outflags[tp->t_state]; - /* - * Send any SACK-generated retransmissions. If we're explicitly - * trying to send out new data (when sendalot is 1), bypass this - * function. If we retransmit in fast recovery mode, decrement - * snd_cwnd, since we're replacing a (future) new transmission with - * a retransmission now, and we previously incremented snd_cwnd in - * tcp_input(). - */ - /* - * Still in sack recovery , reset rxmit flag to zero. - */ while (rack->rc_free_cnt < rack_free_cache) { rsm = rack_alloc(rack); if (rsm == NULL) { @@ -7126,7 +8279,7 @@ again: slot = 1; goto just_return_nolock; } - TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_next); + TAILQ_INSERT_TAIL(&rack->r_ctl.rc_free, rsm, r_tnext); rack->rc_free_cnt++; rsm = NULL; } @@ -7145,18 +8298,24 @@ again: long tlen; doing_tlp = 1; - rsm = rack->r_ctl.rc_tlpsend; + /* + * Check if we can do a TLP with a RACK'd packet + * this can happen if we are not doing the rack + * cheat and we skipped to a TLP and it + * went off. + */ + rsm = tcp_rack_output(tp, rack, cts); + if (rsm == NULL) + rsm = rack->r_ctl.rc_tlpsend; rack->r_ctl.rc_tlpsend = NULL; sack_rxmit = 1; tlen = rsm->r_end - rsm->r_start; - if (tlen > tp->t_maxseg) - tlen = tp->t_maxseg; -#ifdef INVARIANTS - if (SEQ_GT(tp->snd_una, rsm->r_start)) { - panic("tp:%p rack:%p snd_una:%u rsm:%p r_start:%u", - tp, rack, tp->snd_una, rsm, rsm->r_start); - } -#endif + if (tlen > ctf_fixed_maxseg(tp)) + tlen = ctf_fixed_maxseg(tp); + KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start), + ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p", + __func__, __LINE__, + rsm->r_start, tp->snd_una, tp, rack, rsm)); sb_offset = rsm->r_start - tp->snd_una; cwin = min(tp->snd_wnd, tlen); len = cwin; @@ -7167,16 +8326,19 @@ again: len = rsm->r_end - rsm->r_start; sack_rxmit = 1; sendalot = 0; + KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start), + ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p", + __func__, __LINE__, + rsm->r_start, tp->snd_una, tp, rack, rsm)); sb_offset = rsm->r_start - tp->snd_una; - if (len >= tp->t_maxseg) { - len = tp->t_maxseg; + if (len >= ctf_fixed_maxseg(tp)) { + len = ctf_fixed_maxseg(tp); } - KASSERT(sb_offset >= 0, ("%s: sack block to the left of una : %d", - __func__, sb_offset)); } else if ((rack->rc_in_persist == 0) && ((rsm = tcp_rack_output(tp, rack, cts)) != NULL)) { - long tlen; + int maxseg; + maxseg = ctf_fixed_maxseg(tp); if ((!IN_RECOVERY(tp->t_flags)) && ((tp->t_flags & (TF_WASFRECOVERY | TF_WASCRECOVERY)) == 0)) { /* Enter recovery if not induced by a time-out */ @@ -7188,7 +8350,8 @@ again: * When we enter recovery we need to assure we send * one packet. */ - rack->r_ctl.rc_prr_sndcnt = tp->t_maxseg; + rack->r_ctl.rc_prr_sndcnt = ctf_fixed_maxseg(tp); + rack_log_to_prr(rack, 13); } #ifdef INVARIANTS if (SEQ_LT(rsm->r_start, tp->snd_una)) { @@ -7196,39 +8359,57 @@ again: tp, rack, rsm, rsm->r_start, tp->snd_una); } #endif - tlen = rsm->r_end - rsm->r_start; + len = rsm->r_end - rsm->r_start; + KASSERT(SEQ_LEQ(tp->snd_una, rsm->r_start), + ("%s:%d: r.start:%u < SND.UNA:%u; tp:%p, rack:%p, rsm:%p", + __func__, __LINE__, + rsm->r_start, tp->snd_una, tp, rack, rsm)); sb_offset = rsm->r_start - tp->snd_una; - if (tlen > rack->r_ctl.rc_prr_sndcnt) { - len = rack->r_ctl.rc_prr_sndcnt; - } else { - len = tlen; - } - if (len >= tp->t_maxseg) { - sendalot = 1; - len = tp->t_maxseg; - } else { - sendalot = 0; - if ((rack->rc_timer_up == 0) && - (len < tlen)) { + /* Can we send it within the PRR boundary? */ + if ((rack->use_rack_cheat == 0) && (len > rack->r_ctl.rc_prr_sndcnt)) { + /* It does not fit */ + if ((ctf_flight_size(tp, rack->r_ctl.rc_sacked) > len) && + (rack->r_ctl.rc_prr_sndcnt < maxseg)) { /* - * If its not a timer don't send a partial - * segment. + * prr is less than a segment, we + * have more acks due in besides + * what we need to resend. Lets not send + * to avoid sending small pieces of + * what we need to retransmit. */ len = 0; goto just_return_nolock; } + len = rack->r_ctl.rc_prr_sndcnt; + } + sendalot = 0; + if (len >= maxseg) { + len = maxseg; } - KASSERT(sb_offset >= 0, ("%s: sack block to the left of una : %d", - __func__, sb_offset)); if (len > 0) { sub_from_prr = 1; sack_rxmit = 1; TCPSTAT_INC(tcps_sack_rexmits); TCPSTAT_ADD(tcps_sack_rexmit_bytes, - min(len, tp->t_maxseg)); + min(len, ctf_fixed_maxseg(tp))); counter_u64_add(rack_rtm_prr_retran, 1); } } + /* + * Enforce a connection sendmap count limit if set + * as long as we are not retransmiting. + */ + if ((rsm == NULL) && + (rack->do_detection == 0) && + (rack_tcp_map_entries_limit > 0) && + (rack->r_ctl.rc_num_maps_alloced >= rack_tcp_map_entries_limit)) { + counter_u64_add(rack_to_alloc_limited, 1); + if (!rack->alloc_limit_reported) { + rack->alloc_limit_reported = 1; + counter_u64_add(rack_alloc_limited_conns, 1); + } + goto just_return_nolock; + } if (rsm && (rsm->r_flags & RACK_HAS_FIN)) { /* we are retransmitting the fin */ len--; @@ -7244,20 +8425,6 @@ again: /* For debugging */ rack->r_ctl.rc_rsm_at_retran = rsm; #endif - /* - * Enforce a connection sendmap count limit if set - * as long as we are not retransmiting. - */ - if ((rsm == NULL) && - (rack_map_entries_limit > 0) && - (rack->r_ctl.rc_num_maps_alloced >= rack_map_entries_limit)) { - counter_u64_add(rack_to_alloc_limited, 1); - if (!rack->alloc_limit_reported) { - rack->alloc_limit_reported = 1; - counter_u64_add(rack_alloc_limited_conns, 1); - } - goto just_return_nolock; - } /* * Get standard flags, and add SYN or FIN if requested by 'hidden' * state flags. @@ -7299,7 +8466,9 @@ again: flags &= ~TH_FIN; sendwin = 1; } else { - if (rack->rc_in_persist) + if ((rack->rc_in_persist != 0) && + (tp->snd_wnd >= min((rack->r_ctl.rc_high_rwnd/2), + rack->r_ctl.rc_pace_min_segs))) rack_exit_persist(tp, rack); /* * If we are dropping persist mode then we need to @@ -7328,7 +8497,7 @@ again: uint32_t avail; avail = sbavail(sb); - if (SEQ_GT(tp->snd_nxt, tp->snd_una)) + if (SEQ_GT(tp->snd_nxt, tp->snd_una) && avail) sb_offset = tp->snd_nxt - tp->snd_una; else sb_offset = 0; @@ -7343,7 +8512,7 @@ again: else len = rack->r_ctl.rc_tlp_new_data; rack->r_ctl.rc_tlp_new_data = 0; - doing_tlp = 1; + new_data_tlp = doing_tlp = 1; } else { if (sendwin > avail) { /* use the available */ @@ -7387,13 +8556,12 @@ again: if (len > 0) { if (len > rack->r_ctl.rc_prr_sndcnt) len = rack->r_ctl.rc_prr_sndcnt; - if (len > 0) { sub_from_prr = 1; counter_u64_add(rack_rtm_prr_newdata, 1); } } - if (len > tp->t_maxseg) { + if (len > ctf_fixed_maxseg(tp)) { /* * We should never send more than a MSS when * retransmitting or sending new data in prr @@ -7402,8 +8570,8 @@ again: * let us send a lot as well :-) */ if (rack->r_ctl.rc_prr_sendalot == 0) - len = tp->t_maxseg; - } else if (len < tp->t_maxseg) { + len = ctf_fixed_maxseg(tp); + } else if (len < ctf_fixed_maxseg(tp)) { /* * Do we send any? The idea here is if the * send empty's the socket buffer we want to @@ -7429,19 +8597,18 @@ again: * SYN-SENT state and if segment contains data and if we don't know * that foreign host supports TAO, suppress sending segment. */ - if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) { - if ((tp->t_state != TCPS_SYN_RECEIVED) && - (tp->t_state != TCPS_SYN_SENT)) + if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una) && + ((sack_rxmit == 0) && (tp->t_rxtshift == 0))) { + if (tp->t_state != TCPS_SYN_RECEIVED) flags &= ~TH_SYN; -#ifdef TCP_RFC7413 /* * When sending additional segments following a TFO SYN|ACK, * do not include the SYN bit. */ - if ((tp->t_flags & TF_FASTOPEN) && + if (IS_FASTOPEN(tp->t_flags) && (tp->t_state == TCPS_SYN_RECEIVED)) flags &= ~TH_SYN; -#endif + sb_offset--, len++; } /* * Be careful not to send data and/or FIN on SYN segments. This @@ -7452,16 +8619,30 @@ again: len = 0; flags &= ~TH_FIN; } -#ifdef TCP_RFC7413 /* - * When retransmitting SYN|ACK on a passively-created TFO socket, - * don't include data, as the presence of data may have caused the - * original SYN|ACK to have been dropped by a middlebox. + * On TFO sockets, ensure no data is sent in the following cases: + * + * - When retransmitting SYN|ACK on a passively-created socket + * + * - When retransmitting SYN on an actively created socket + * + * - When sending a zero-length cookie (cookie request) on an + * actively created socket + * + * - When the socket is in the CLOSED state (RST is being sent) */ - if ((tp->t_flags & TF_FASTOPEN) && - ((tp->t_state == TCPS_SYN_RECEIVED) && (tp->t_rxtshift > 0))) + if (IS_FASTOPEN(tp->t_flags) && + (((flags & TH_SYN) && (tp->t_rxtshift > 0)) || + ((tp->t_state == TCPS_SYN_SENT) && + (tp->t_tfo_client_cookie_len == 0)) || + (flags & TH_RST))) { + sack_rxmit = 0; len = 0; -#endif + } + /* Without fast-open there should never be data sent on a SYN */ + if ((flags & TH_SYN) && (!IS_FASTOPEN(tp->t_flags))) + len = 0; + orig_len = len; if (len <= 0) { /* * If FIN has been sent but not acked, but we haven't been @@ -7481,10 +8662,68 @@ again: len = 0; if ((tp->snd_wnd == 0) && (TCPS_HAVEESTABLISHED(tp->t_state)) && + (tp->snd_una == tp->snd_max) && (sb_offset < (int)sbavail(sb))) { tp->snd_nxt = tp->snd_una; rack_enter_persist(tp, rack, cts); } + } else if ((rsm == NULL) && + ((doing_tlp == 0) || (new_data_tlp == 1)) && + (len < rack->r_ctl.rc_pace_max_segs)) { + /* + * We are not sending a full segment for + * some reason. Should we not send anything (think + * sws or persists)? + */ + if ((tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) && + (TCPS_HAVEESTABLISHED(tp->t_state)) && + (len < (int)(sbavail(sb) - sb_offset))) { + /* + * Here the rwnd is less than + * the pacing size, this is not a retransmit, + * we are established and + * the send is not the last in the socket buffer + * we send nothing, and may enter persists. + */ + len = 0; + if (tp->snd_max == tp->snd_una) { + /* + * Nothing out we can + * go into persists. + */ + rack_enter_persist(tp, rack, cts); + tp->snd_nxt = tp->snd_una; + } + } else if ((tp->snd_cwnd >= max(rack->r_ctl.rc_pace_min_segs, (maxseg * 4))) && + (ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * maxseg)) && + (len < (int)(sbavail(sb) - sb_offset)) && + (len < rack->r_ctl.rc_pace_min_segs)) { + /* + * Here we are not retransmitting, and + * the cwnd is not so small that we could + * not send at least a min size (rxt timer + * not having gone off), We have 2 segments or + * more already in flight, its not the tail end + * of the socket buffer and the cwnd is blocking + * us from sending out a minimum pacing segment size. + * Lets not send anything. + */ + len = 0; + } else if (((tp->snd_wnd - ctf_outstanding(tp)) < + min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs)) && + (ctf_flight_size(tp, rack->r_ctl.rc_sacked) > (2 * maxseg)) && + (len < (int)(sbavail(sb) - sb_offset)) && + (TCPS_HAVEESTABLISHED(tp->t_state))) { + /* + * Here we have a send window but we have + * filled it up and we can't send another pacing segment. + * We also have in flight more than 2 segments + * and we are not completing the sb i.e. we allow + * the last bytes of the sb to go out even if + * its not a full pacing segment. + */ + len = 0; + } } /* len will be >= 0 after this point. */ KASSERT(len >= 0, ("[%s:%d]: len < 0", __func__, __LINE__)); @@ -7537,10 +8776,8 @@ again: #if defined(IPSEC) || defined(IPSEC_SUPPORT) ipoptlen += ipsec_optlen; #endif - if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && len > tp->t_maxseg && -#ifdef NETFLIX_TCP_O_UDP + if ((tp->t_flags & TF_TSO) && V_tcp_do_tso && len > ctf_fixed_maxseg(tp) && (tp->t_port == 0) && -#endif ((tp->t_flags & TF_SIGNATURE) == 0) && tp->rcv_numsacks == 0 && sack_rxmit == 0 && ipoptlen == 0) @@ -7556,16 +8793,7 @@ again: */ outstanding--; } - if (outstanding > 0) { - /* - * This is sub-optimal. We only send a stand alone - * FIN on its own segment. - */ - if (flags & TH_FIN) { - flags &= ~TH_FIN; - would_have_fin = 1; - } - } else if (sack_rxmit) { + if (sack_rxmit) { if ((rsm->r_flags & RACK_HAS_FIN) == 0) flags &= ~TH_FIN; } else { @@ -7587,7 +8815,7 @@ again: * limited the window size) - we need to retransmit */ if (len) { - if (len >= tp->t_maxseg) { + if (len >= ctf_fixed_maxseg(tp)) { pass = 1; goto send; } @@ -7677,10 +8905,10 @@ again: if (oldwin >> tp->rcv_scale == (adv + oldwin) >> tp->rcv_scale) goto dontupdate; - if (adv >= (int32_t)(2 * tp->t_maxseg) && + if (adv >= (int32_t)(2 * ctf_fixed_maxseg(tp)) && (adv >= (int32_t)(so->so_rcv.sb_hiwat / 4) || recwin <= (int32_t)(so->so_rcv.sb_hiwat / 8) || - so->so_rcv.sb_hiwat <= 8 * tp->t_maxseg)) { + so->so_rcv.sb_hiwat <= 8 * ctf_fixed_maxseg(tp))) { pass = 7; goto send; } @@ -7709,13 +8937,10 @@ dontupdate: * If our state indicates that FIN should be sent and we have not * yet done so, then we need to send. */ - if (flags & TH_FIN) { - if ((tp->t_flags & TF_SENTFIN) || - (((tp->t_flags & TF_SENTFIN) == 0) && - (tp->snd_nxt == tp->snd_una))) { - pass = 11; - goto send; - } + if ((flags & TH_FIN) && + (tp->snd_nxt == tp->snd_una)) { + pass = 11; + goto send; } /* * No reason to send a segment, just return. @@ -7725,12 +8950,38 @@ just_return: just_return_nolock: if (tot_len_this_send == 0) counter_u64_add(rack_out_size[TCP_MSS_ACCT_JUSTRET], 1); - rack_start_hpts_timer(rack, tp, cts, __LINE__, slot, tot_len_this_send, 1); + if (slot) { + /* set the rack tcb into the slot N */ + counter_u64_add(rack_paced_segments, 1); + } else if (tot_len_this_send) { + counter_u64_add(rack_unpaced_segments, 1); + } + /* Check if we need to go into persists or not */ + if ((rack->rc_in_persist == 0) && + (tp->snd_max == tp->snd_una) && + TCPS_HAVEESTABLISHED(tp->t_state) && + sbavail(&tp->t_inpcb->inp_socket->so_snd) && + (sbavail(&tp->t_inpcb->inp_socket->so_snd) > tp->snd_wnd) && + (tp->snd_wnd < min((rack->r_ctl.rc_high_rwnd/2), rack->r_ctl.rc_pace_min_segs))) { + /* Yes lets make sure to move to persist before timer-start */ + rack_enter_persist(tp, rack, rack->r_ctl.rc_rcvtime); + } + rack_start_hpts_timer(rack, tp, cts, slot, tot_len_this_send, sup_rack); rack_log_type_just_return(rack, cts, tot_len_this_send, slot, hpts_calling); tp->t_flags &= ~TF_FORCEDATA; return (0); send: + if ((flags & TH_FIN) && + sbavail(&tp->t_inpcb->inp_socket->so_snd)) { + /* + * We do not transmit a FIN + * with data outstanding. We + * need to make it so all data + * is acked first. + */ + flags &= ~TH_FIN; + } if (doing_tlp == 0) { /* * Data not a TLP, and its not the rxt firing. If it is the @@ -7743,7 +8994,7 @@ send: } SOCKBUF_LOCK_ASSERT(sb); if (len > 0) { - if (len >= tp->t_maxseg) + if (len >= ctf_fixed_maxseg(tp)) tp->t_flags2 |= TF2_PLPMTU_MAXSEGSNT; else tp->t_flags2 &= ~TF2_PLPMTU_MAXSEGSNT; @@ -7774,27 +9025,44 @@ send: if (flags & TH_SYN) { tp->snd_nxt = tp->iss; to.to_mss = tcp_mssopt(&inp->inp_inc); -#ifdef NETFLIX_TCP_O_UDP +#ifdef NETFLIX_TCPOUDP if (tp->t_port) to.to_mss -= V_tcp_udp_tunneling_overhead; #endif to.to_flags |= TOF_MSS; -#ifdef TCP_RFC7413 + /* - * Only include the TFO option on the first - * transmission of the SYN|ACK on a - * passively-created TFO socket, as the presence of - * the TFO option may have caused the original - * SYN|ACK to have been dropped by a middlebox. + * On SYN or SYN|ACK transmits on TFO connections, + * only include the TFO option if it is not a + * retransmit, as the presence of the TFO option may + * have caused the original SYN or SYN|ACK to have + * been dropped by a middlebox. */ - if ((tp->t_flags & TF_FASTOPEN) && - (tp->t_state == TCPS_SYN_RECEIVED) && + if (IS_FASTOPEN(tp->t_flags) && (tp->t_rxtshift == 0)) { - to.to_tfo_len = TCP_FASTOPEN_MAX_COOKIE_LEN; - to.to_tfo_cookie = (u_char *)&tp->t_tfo_cookie; - to.to_flags |= TOF_FASTOPEN; + if (tp->t_state == TCPS_SYN_RECEIVED) { + to.to_tfo_len = TCP_FASTOPEN_COOKIE_LEN; + to.to_tfo_cookie = + (u_int8_t *)&tp->t_tfo_cookie.server; + to.to_flags |= TOF_FASTOPEN; + wanted_cookie = 1; + } else if (tp->t_state == TCPS_SYN_SENT) { + to.to_tfo_len = + tp->t_tfo_client_cookie_len; + to.to_tfo_cookie = + tp->t_tfo_cookie.client; + to.to_flags |= TOF_FASTOPEN; + wanted_cookie = 1; + /* + * If we wind up having more data to + * send with the SYN than can fit in + * one segment, don't send any more + * until the SYN|ACK comes back from + * the other end. + */ + sendalot = 0; + } } -#endif } /* Window scaling. */ if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) { @@ -7829,8 +9097,15 @@ send: /* Processing the options. */ hdrlen += optlen = tcp_addoptions(&to, opt); + /* + * If we wanted a TFO option to be added, but it was unable + * to fit, ensure no data is sent. + */ + if (IS_FASTOPEN(tp->t_flags) && wanted_cookie && + !(to.to_flags & TOF_FASTOPEN)) + len = 0; } -#ifdef NETFLIX_TCP_O_UDP +#ifdef NETFLIX_TCPOUDP if (tp->t_port) { if (V_tcp_udp_tunneling_port == 0) { /* The port was removed?? */ @@ -7854,16 +9129,18 @@ send: ipoptlen += ipsec_optlen; #endif +#ifdef KERN_TLS + /* force TSO for so TLS offload can get mss */ + if (sb->sb_flags & SB_TLS_IFNET) { + force_tso = 1; + } +#endif /* * Adjust data length if insertion of options will bump the packet * length beyond the t_maxseg length. Clear the FIN bit because we * cut off the tail of the segment. */ if (len + optlen + ipoptlen > tp->t_maxseg) { - if (flags & TH_FIN) { - would_have_fin = 1; - flags &= ~TH_FIN; - } if (tso) { uint32_t if_hw_tsomax; uint32_t moff; @@ -7896,18 +9173,19 @@ send: * unless the send sockbuf can be emptied: */ max_len = (tp->t_maxseg - optlen); - if ((sb_offset + len) < sbavail(sb)) { + if (((sb_offset + len) < sbavail(sb)) && + (hw_tls == 0)) { moff = len % (u_int)max_len; if (moff != 0) { len -= moff; sendalot = 1; } - } - /* + } + /* * In case there are too many small fragments don't * use TSO: */ - if (len <= max_len) { + if (len <= maxseg) { len = max_len; sendalot = 1; tso = 0; @@ -7974,9 +9252,11 @@ send: uint32_t moff; if (rack->rc_pace_max_segs) - max_val = rack->rc_pace_max_segs * tp->t_maxseg; + max_val = rack->rc_pace_max_segs * ctf_fixed_maxseg(tp); else max_val = len; + if (rack->r_ctl.rc_pace_max_segs < max_val) + max_val = rack->r_ctl.rc_pace_max_segs; /* * We allow a limit on sending with hptsi. */ @@ -8017,9 +9297,17 @@ send: msb = NULL; else msb = sb; - m->m_next = tcp_m_copym(/*tp, */ mb, moff, &len, - if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, msb, - hw_tls /*, NULL */); + m->m_next = tcp_m_copym( +#ifdef NETFLIX_COPY_ARGS + tp, +#endif + mb, moff, &len, + if_hw_tsomaxsegcount, if_hw_tsomaxsegsize, msb, + ((rsm == NULL) ? hw_tls : 0) +#ifdef NETFLIX_COPY_ARGS + , &filled_all +#endif + ); if (len <= (tp->t_maxseg - optlen)) { /* * Must have ran out of mbufs for the copy @@ -8053,8 +9341,6 @@ send: * TLP should not count in retran count, but * in its own bin */ -/* tp->t_sndtlppack++;*/ -/* tp->t_sndtlpbyte += len;*/ counter_u64_add(rack_tlp_retran, 1); counter_u64_add(rack_tlp_retran_bytes, len); } else { @@ -8085,7 +9371,7 @@ send: flags |= TH_PUSH; /* - * Are we doing hptsi, if so we must calculate the slot. We + * Are we doing pacing, if so we must calculate the slot. We * only do hptsi in ESTABLISHED and with no RESET being * sent where we have data to send. */ @@ -8094,56 +9380,10 @@ send: ((tp->t_state == TCPS_FIN_WAIT_1) && ((tp->t_flags & TF_SENTFIN) == 0) && ((flags & TH_FIN) == 0))) && - ((flags & TH_RST) == 0) && - (rack->rc_always_pace)) { - /* - * We use the most optimistic possible cwnd/srtt for - * sending calculations. This will make our - * calculation anticipate getting more through - * quicker then possible. But thats ok we don't want - * the peer to have a gap in data sending. - */ - uint32_t srtt, cwnd, tr_perms = 0; - - if (rack->r_ctl.rc_rack_min_rtt) - srtt = rack->r_ctl.rc_rack_min_rtt; - else - srtt = TICKS_2_MSEC((tp->t_srtt >> TCP_RTT_SHIFT)); - if (rack->r_ctl.rc_rack_largest_cwnd) - cwnd = rack->r_ctl.rc_rack_largest_cwnd; - else - cwnd = tp->snd_cwnd; - tr_perms = cwnd / srtt; - if (tr_perms == 0) { - tr_perms = tp->t_maxseg; - } + ((flags & TH_RST) == 0)) { + /* Get our pacing rate */ tot_len_this_send += len; - /* - * Calculate how long this will take to drain, if - * the calculation comes out to zero, thats ok we - * will use send_a_lot to possibly spin around for - * more increasing tot_len_this_send to the point - * that its going to require a pace, or we hit the - * cwnd. Which in that case we are just waiting for - * a ACK. - */ - slot = tot_len_this_send / tr_perms; - /* Now do we reduce the time so we don't run dry? */ - if (slot && rack->rc_pace_reduce) { - int32_t reduce; - - reduce = (slot / rack->rc_pace_reduce); - if (reduce < slot) { - slot -= reduce; - } else - slot = 0; - } - if (rack->r_enforce_min_pace && - (slot == 0) && - (tot_len_this_send >= (rack->r_min_pace_seg_thresh * tp->t_maxseg))) { - /* We are enforcing a minimum pace time of 1ms */ - slot = rack->r_enforce_min_pace; - } + slot = rack_get_pacing_delay(rack, tp, tot_len_this_send); } SOCKBUF_UNLOCK(sb); } else { @@ -8180,7 +9420,7 @@ send: #ifdef INET6 if (isipv6) { ip6 = mtod(m, struct ip6_hdr *); -#ifdef NETFLIX_TCP_O_UDP +#ifdef NETFLIX_TCPOUDP if (tp->t_port) { udp = (struct udphdr *)((caddr_t)ip6 + ipoptlen + sizeof(struct ip6_hdr)); udp->uh_sport = htons(V_tcp_udp_tunneling_port); @@ -8188,10 +9428,14 @@ send: ulen = hdrlen + len - sizeof(struct ip6_hdr); udp->uh_ulen = htons(ulen); th = (struct tcphdr *)(udp + 1); - } else + } else #endif th = (struct tcphdr *)(ip6 + 1); - tcpip_fillheaders(inp, /*tp->t_port, */ ip6, th); + tcpip_fillheaders(inp, +#ifdef NETFLIX_TCPOUDP + tp->t_port, +#endif + ip6, th); } else #endif /* INET6 */ { @@ -8199,7 +9443,7 @@ send: #ifdef TCPDEBUG ipov = (struct ipovly *)ip; #endif -#ifdef NETFLIX_TCP_O_UDP +#ifdef NETFLIX_TCPOUDP if (tp->t_port) { udp = (struct udphdr *)((caddr_t)ip + ipoptlen + sizeof(struct ip)); udp->uh_sport = htons(V_tcp_udp_tunneling_port); @@ -8210,7 +9454,11 @@ send: } else #endif th = (struct tcphdr *)(ip + 1); - tcpip_fillheaders(inp,/*tp->t_port, */ ip, th); + tcpip_fillheaders(inp, +#ifdef NETFLIX_TCPOUDP + tp->t_port, +#endif + ip, th); } /* * Fill in fields, remembering maximum advertised window for use in @@ -8301,15 +9549,20 @@ send: /* * Calculate receive window. Don't shrink window, but avoid silly * window syndrome. + * If a RST segment is sent, advertise a window of zero. */ - if (recwin < (long)(so->so_rcv.sb_hiwat / 4) && - recwin < (long)tp->t_maxseg) + if (flags & TH_RST) { recwin = 0; - if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) && - recwin < (long)(tp->rcv_adv - tp->rcv_nxt)) - recwin = (long)(tp->rcv_adv - tp->rcv_nxt); - if (recwin > (long)TCP_MAXWIN << tp->rcv_scale) - recwin = (long)TCP_MAXWIN << tp->rcv_scale; + } else { + if (recwin < (long)(so->so_rcv.sb_hiwat / 4) && + recwin < (long)ctf_fixed_maxseg(tp)) + recwin = 0; + if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt) && + recwin < (long)(tp->rcv_adv - tp->rcv_nxt)) + recwin = (long)(tp->rcv_adv - tp->rcv_nxt); + if (recwin > (long)TCP_MAXWIN << tp->rcv_scale) + recwin = (long)TCP_MAXWIN << tp->rcv_scale; + } /* * According to RFC1323 the window field in a SYN (i.e., a <SYN> or @@ -8376,7 +9629,6 @@ send: * ip6_plen is not need to be filled now, and will be filled * in ip6_output. */ -#ifdef NETFLIX_TCP_O_UDP if (tp->t_port) { m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); @@ -8384,15 +9636,12 @@ send: th->th_sum = htons(0); UDPSTAT_INC(udps_opackets); } else { -#endif m->m_pkthdr.csum_flags = CSUM_TCP_IPV6; m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); th->th_sum = in6_cksum_pseudo(ip6, sizeof(struct tcphdr) + optlen + len, IPPROTO_TCP, 0); -#ifdef NETFLIX_TCP_O_UDP } -#endif } #endif #if defined(INET6) && defined(INET) @@ -8400,7 +9649,6 @@ send: #endif #ifdef INET { -#ifdef NETFLIX_TCP_O_UDP if (tp->t_port) { m->m_pkthdr.csum_flags = CSUM_UDP; m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); @@ -8409,28 +9657,24 @@ send: th->th_sum = htons(0); UDPSTAT_INC(udps_opackets); } else { -#endif m->m_pkthdr.csum_flags = CSUM_TCP; m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); th->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, htons(sizeof(struct tcphdr) + IPPROTO_TCP + len + optlen)); -#ifdef NETFLIX_TCP_O_UDP } -#endif /* IP version must be set here for ipv4/ipv6 checking later */ KASSERT(ip->ip_v == IPVERSION, ("%s: IP version incorrect: %d", __func__, ip->ip_v)); } #endif - /* * Enable TSO and specify the size of the segments. The TCP pseudo * header checksum is always provided. XXX: Fixme: This is currently * not the case for IPv6. */ - if (tso) { - KASSERT(len > tp->t_maxseg - optlen, + if (tso || force_tso) { + KASSERT(force_tso || len > tp->t_maxseg - optlen, ("%s: len <= tso_segsz", __func__)); m->m_pkthdr.csum_flags |= CSUM_TSO; m->m_pkthdr.tso_segsz = tp->t_maxseg - optlen; @@ -8443,7 +9687,6 @@ send: /* Run HHOOK_TCP_ESTABLISHED_OUT helper hooks. */ hhook_run_tcp_est_out(tp, th, &to, len, tso); #endif - #ifdef TCPDEBUG /* * Trace. @@ -8470,18 +9713,29 @@ send: /* We're getting ready to send; log now. */ if (tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; + struct timeval tv; memset(&log.u_bbr, 0, sizeof(log.u_bbr)); log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts; log.u_bbr.ininput = rack->rc_inp->inp_in_input; log.u_bbr.flex1 = rack->r_ctl.rc_prr_sndcnt; + log.u_bbr.flex2 = rack->r_ctl.rc_pace_min_segs; + log.u_bbr.flex3 = rack->r_ctl.rc_pace_max_segs; + log.u_bbr.flex4 = orig_len; + if (filled_all) + log.u_bbr.flex5 = 0x80000000; + else + log.u_bbr.flex5 = 0; if (rsm || sack_rxmit) { log.u_bbr.flex8 = 1; } else { log.u_bbr.flex8 = 0; } + log.u_bbr.pkts_out = tp->t_maxseg; + log.u_bbr.timeStamp = tcp_get_usecs(&tv); + log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked); lgb = tcp_log_event_(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_OUT, ERRNO_UNK, - len, &log, false, NULL, NULL, 0, NULL); + len, &log, false, NULL, NULL, 0, &tv); } else lgb = NULL; @@ -8585,7 +9839,7 @@ out: if (TCPS_HAVEESTABLISHED(tp->t_state) && (tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) - tcp_clean_dsack_blocks(tp); + tcp_clean_dsack_blocks(tp); if (len == 0) counter_u64_add(rack_out_size[TCP_MSS_ACCT_SNDACK], 1); else if (len == 1) { @@ -8593,12 +9847,38 @@ out: } else if (len > 1) { int idx; - idx = (len / tp->t_maxseg) + 3; + idx = (len / ctf_fixed_maxseg(tp)) + 3; if (idx >= TCP_MSS_ACCT_ATIMER) counter_u64_add(rack_out_size[(TCP_MSS_ACCT_ATIMER-1)], 1); else counter_u64_add(rack_out_size[idx], 1); } + if (hw_tls && len > 0) { + if (filled_all) { + counter_u64_add(rack_tls_filled, 1); + rack_log_type_hrdwtso(tp, rack, len, 0, orig_len, 1); + } else { + if (rsm) { + counter_u64_add(rack_tls_rxt, 1); + rack_log_type_hrdwtso(tp, rack, len, 2, orig_len, 1); + } else if (doing_tlp) { + counter_u64_add(rack_tls_tlp, 1); + rack_log_type_hrdwtso(tp, rack, len, 3, orig_len, 1); + } else if ( (ctf_outstanding(tp) + rack->r_ctl.rc_pace_min_segs) > sbavail(sb)) { + counter_u64_add(rack_tls_app, 1); + rack_log_type_hrdwtso(tp, rack, len, 4, orig_len, 1); + } else if ((ctf_flight_size(tp, rack->r_ctl.rc_sacked) + rack->r_ctl.rc_pace_min_segs) > tp->snd_cwnd) { + counter_u64_add(rack_tls_cwnd, 1); + rack_log_type_hrdwtso(tp, rack, len, 5, orig_len, 1); + } else if ((ctf_outstanding(tp) + rack->r_ctl.rc_pace_min_segs) > tp->snd_wnd) { + counter_u64_add(rack_tls_rwnd, 1); + rack_log_type_hrdwtso(tp, rack, len, 6, orig_len, 1); + } else { + rack_log_type_hrdwtso(tp, rack, len, 7, orig_len, 1); + counter_u64_add(rack_tls_other, 1); + } + } + } } if (sub_from_prr && (error == 0)) { if (rack->r_ctl.rc_prr_sndcnt >= len) @@ -8609,17 +9889,20 @@ out: sub_from_prr = 0; rack_log_output(tp, &to, len, rack_seq, (uint8_t) flags, error, cts, pass, rsm); + if ((error == 0) && + (len > 0) && + (tp->snd_una == tp->snd_max)) + rack->r_ctl.rc_tlp_rxt_last_time = cts; if ((tp->t_flags & TF_FORCEDATA) == 0 || (rack->rc_in_persist == 0)) { -#ifdef NETFLIX_STATS tcp_seq startseq = tp->snd_nxt; -#endif + /* * Advance snd_nxt over sequence space of this segment. */ if (error) /* We don't log or do anything with errors */ - goto timer; + goto nomore; if (flags & (TH_SYN | TH_FIN)) { if (flags & TH_SYN) @@ -8631,7 +9914,7 @@ out: } /* In the ENOBUFS case we do *not* update snd_max */ if (sack_rxmit) - goto timer; + goto nomore; tp->snd_nxt += len; if (SEQ_GT(tp->snd_nxt, tp->snd_max)) { @@ -8644,6 +9927,17 @@ out: tp->t_acktime = ticks; } tp->snd_max = tp->snd_nxt; + /* + * Time this transmission if not a retransmission and + * not currently timing anything. + * This is only relevant in case of switching back to + * the base stack. + */ + if (tp->t_rtttime == 0) { + tp->t_rtttime = ticks; + tp->t_rtseq = startseq; + TCPSTAT_INC(tcps_segstimed); + } #ifdef NETFLIX_STATS if (!(tp->t_flags & TF_GPUTINPROG) && len) { tp->t_flags |= TF_GPUTINPROG; @@ -8654,26 +9948,6 @@ out: } #endif } - /* - * Set retransmit timer if not currently set, and not doing - * a pure ack or a keep-alive probe. Initial value for - * retransmit timer is smoothed round-trip time + 2 * - * round-trip time variance. Initialize shift counter which - * is used for backoff of retransmit time. - */ -timer: - if ((tp->snd_wnd == 0) && - TCPS_HAVEESTABLISHED(tp->t_state)) { - /* - * If the persists timer was set above (right before - * the goto send), and still needs to be on. Lets - * make sure all is canceled. If the persist timer - * is not running, we want to get it up. - */ - if (rack->rc_in_persist == 0) { - rack_enter_persist(tp, rack, cts); - } - } } else { /* * Persist case, update snd_max but since we are in persist @@ -8755,7 +10029,7 @@ nomore: goto again; } slot = 10; - rack_start_hpts_timer(rack, tp, cts, __LINE__, slot, 0, 1); + rack_start_hpts_timer(rack, tp, cts, slot, 0, 0); tp->t_flags &= ~TF_FORCEDATA; return (error); case ENETUNREACH: @@ -8769,7 +10043,7 @@ nomore: /* FALLTHROUGH */ default: slot = 10; - rack_start_hpts_timer(rack, tp, cts, __LINE__, slot, 0, 1); + rack_start_hpts_timer(rack, tp, cts, slot, 0, 0); tp->t_flags &= ~TF_FORCEDATA; return (error); } @@ -8789,15 +10063,22 @@ nomore: tp->t_flags &= ~(TF_ACKNOW | TF_DELACK); enobufs: rack->r_tlp_running = 0; - if ((flags & TH_RST) || (would_have_fin == 1)) { + if (flags & TH_RST) { /* - * We don't send again after a RST. We also do *not* send - * again if we would have had a find, but now have - * outstanding data. + * We don't send again after sending a RST. */ slot = 0; sendalot = 0; } + if (rsm && (slot == 0)) { + /* + * Dup ack retransmission possibly, so + * lets assure we have at least min rack + * time, if its a rack resend then the rack + * to will also be set to this. + */ + slot = rack->r_ctl.rc_min_to; + } if (slot) { /* set the rack tcb into the slot N */ counter_u64_add(rack_paced_segments, 1); @@ -8811,7 +10092,7 @@ enobufs: counter_u64_add(rack_unpaced_segments, 1); } tp->t_flags &= ~TF_FORCEDATA; - rack_start_hpts_timer(rack, tp, cts, __LINE__, slot, tot_len_this_send, 1); + rack_start_hpts_timer(rack, tp, cts, slot, tot_len_this_send, 0); return (error); } @@ -8847,8 +10128,10 @@ rack_set_sockopt(struct socket *so, struct sockopt *sopt, case TCP_RACK_TLP_INC_VAR: case TCP_RACK_IDLE_REDUCE_HIGH: case TCP_RACK_MIN_PACE: - case TCP_RACK_MIN_PACE_SEG: + case TCP_RACK_GP_INCREASE: case TCP_BBR_RACK_RTT_USE: + case TCP_BBR_USE_RACK_CHEAT: + case TCP_RACK_DO_DETECTION: case TCP_DATA_AFTER_CLOSE: break; default: @@ -8867,6 +10150,13 @@ rack_set_sockopt(struct socket *so, struct sockopt *sopt, tp = intotcpcb(inp); rack = (struct tcp_rack *)tp->t_fb_ptr; switch (sopt->sopt_name) { + case TCP_RACK_DO_DETECTION: + RACK_OPTS_INC(tcp_rack_no_sack); + if (optval == 0) + rack->do_detection = 0; + else + rack->do_detection = 1; + break; case TCP_RACK_PROP_RATE: if ((optval <= 0) || (optval >= 100)) { error = EINVAL; @@ -8919,6 +10209,7 @@ rack_set_sockopt(struct socket *so, struct sockopt *sopt, /* Max segments in a pace */ RACK_OPTS_INC(tcp_rack_max_seg); rack->rc_pace_max_segs = optval; + rack_set_pace_segments(tp, rack); break; case TCP_RACK_PRR_SENDALOT: /* Allow PRR to send more than one seg */ @@ -8956,6 +10247,13 @@ rack_set_sockopt(struct socket *so, struct sockopt *sopt, else error = EINVAL; break; + case TCP_BBR_USE_RACK_CHEAT: + RACK_OPTS_INC(tcp_rack_cheat); + if (optval) + rack->use_rack_cheat = 1; + else + rack->use_rack_cheat = 0; + break; case TCP_RACK_PKT_DELAY: /* RACK added ms i.e. rack-rtt + reord + N */ RACK_OPTS_INC(tcp_rack_pkt_delay); @@ -8963,15 +10261,10 @@ rack_set_sockopt(struct socket *so, struct sockopt *sopt, break; case TCP_RACK_TLP_INC_VAR: /* Does TLP include rtt variance in t-o */ - RACK_OPTS_INC(tcp_rack_tlp_inc_var); - rack->r_ctl.rc_prr_inc_var = optval; + return (EINVAL); break; case TCP_RACK_IDLE_REDUCE_HIGH: - RACK_OPTS_INC(tcp_rack_idle_reduce_high); - if (optval) - rack->r_idle_reduce_largest = 1; - else - rack->r_idle_reduce_largest = 0; + return (EINVAL); break; case TCP_DELACK: if (optval == 0) @@ -8991,12 +10284,13 @@ rack_set_sockopt(struct socket *so, struct sockopt *sopt, else rack->r_enforce_min_pace = optval; break; - case TCP_RACK_MIN_PACE_SEG: - RACK_OPTS_INC(tcp_rack_min_pace_seg); - if (optval >= 16) - rack->r_min_pace_seg_thresh = 15; + case TCP_RACK_GP_INCREASE: + if ((optval >= 0) && + (optval <= 256)) + rack->rack_per_of_gp = optval; else - rack->r_min_pace_seg_thresh = optval; + error = EINVAL; + break; case TCP_BBR_RACK_RTT_USE: if ((optval != USE_RTT_HIGH) && @@ -9016,7 +10310,9 @@ rack_set_sockopt(struct socket *so, struct sockopt *sopt, return (tcp_default_ctloutput(so, sopt, inp, tp)); break; } -/* tcp_log_socket_option(tp, sopt->sopt_name, optval, error);*/ +#ifdef NETFLIX_STATS + tcp_log_socket_option(tp, sopt->sopt_name, optval, error); +#endif INP_WUNLOCK(inp); return (error); } @@ -9034,6 +10330,10 @@ rack_get_sockopt(struct socket *so, struct sockopt *sopt, * impact to this routine. */ switch (sopt->sopt_name) { + case TCP_RACK_DO_DETECTION: + optval = rack->do_detection; + break; + case TCP_RACK_PROP_RATE: optval = rack->r_ctl.rc_prop_rate; break; @@ -9081,6 +10381,10 @@ rack_get_sockopt(struct socket *so, struct sockopt *sopt, /* Does reordering fade after ms time */ optval = rack->r_ctl.rc_reorder_fade; break; + case TCP_BBR_USE_RACK_CHEAT: + /* Do we use the rack cheat for rxt */ + optval = rack->use_rack_cheat; + break; case TCP_RACK_TLP_THRESH: /* RACK TLP theshold i.e. srtt+(srtt/N) */ optval = rack->r_ctl.rc_tlp_threshold; @@ -9094,16 +10398,16 @@ rack_get_sockopt(struct socket *so, struct sockopt *sopt, break; case TCP_RACK_TLP_INC_VAR: /* Does TLP include rtt variance in t-o */ - optval = rack->r_ctl.rc_prr_inc_var; + return (EINVAL); break; case TCP_RACK_IDLE_REDUCE_HIGH: - optval = rack->r_idle_reduce_largest; + return (EINVAL); break; case TCP_RACK_MIN_PACE: optval = rack->r_enforce_min_pace; break; - case TCP_RACK_MIN_PACE_SEG: - optval = rack->r_min_pace_seg_thresh; + case TCP_RACK_GP_INCREASE: + optval = rack->rack_per_of_gp; break; case TCP_BBR_RACK_RTT_USE: optval = rack->r_ctl.rc_rate_sample_method; @@ -9145,9 +10449,11 @@ out: } -struct tcp_function_block __tcp_rack = { +static struct tcp_function_block __tcp_rack = { .tfb_tcp_block_name = __XSTRING(STACKNAME), .tfb_tcp_output = rack_output, + .tfb_do_queued_segments = ctf_do_queued_segments, + .tfb_do_segment_nounlock = rack_do_segment_nounlock, .tfb_tcp_do_segment = rack_do_segment, .tfb_tcp_ctloutput = rack_ctloutput, .tfb_tcp_fb_init = rack_init, @@ -9202,7 +10508,11 @@ tcp_addrack(module_t mod, int32_t type, void *data) rack_sysctl_root = SYSCTL_ADD_NODE(&rack_sysctl_ctx, SYSCTL_STATIC_CHILDREN(_net_inet_tcp), OID_AUTO, +#ifdef STACKALIAS + __XSTRING(STACKALIAS), +#else __XSTRING(STACKNAME), +#endif CTLFLAG_RW, 0, ""); if (rack_sysctl_root == NULL) { @@ -9226,6 +10536,7 @@ free_uma: printf("Failed to register rack module -- err:%d\n", err); return (err); } + tcp_lro_reg_mbufq(); rack_mod_inited = true; break; case MOD_QUIESCE: @@ -9242,6 +10553,7 @@ free_uma: rack_counter_destroy(); rack_mod_inited = false; } + tcp_lro_dereg_mbufq(); err = 0; break; default: diff --git a/sys/netinet/tcp_stacks/rack_bbr_common.c b/sys/netinet/tcp_stacks/rack_bbr_common.c index 96553320cd97..a61c8c4eedf1 100644 --- a/sys/netinet/tcp_stacks/rack_bbr_common.c +++ b/sys/netinet/tcp_stacks/rack_bbr_common.c @@ -40,7 +40,7 @@ __FBSDID("$FreeBSD$"); #include "opt_ipsec.h" #include "opt_tcpdebug.h" #include "opt_ratelimit.h" -/*#include "opt_kern_tls.h"*/ +#include "opt_kern_tls.h" #include <sys/param.h> #include <sys/module.h> #include <sys/kernel.h> @@ -50,20 +50,25 @@ __FBSDID("$FreeBSD$"); #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/proc.h> +#include <sys/qmath.h> #include <sys/socket.h> #include <sys/socketvar.h> #ifdef KERN_TLS -#include <sys/sockbuf_tls.h> +#include <sys/ktls.h> #endif #include <sys/sysctl.h> #include <sys/systm.h> #include <sys/tree.h> +#ifdef NETFLIX_STATS +#include <sys/stats.h> /* Must come after qmath.h and tree.h */ +#endif #include <sys/refcount.h> #include <sys/queue.h> #include <sys/smp.h> #include <sys/kthread.h> #include <sys/lock.h> #include <sys/mutex.h> +#include <sys/tim_filter.h> #include <sys/time.h> #include <vm/uma.h> #include <sys/kern_prefetch.h> @@ -85,6 +90,7 @@ __FBSDID("$FreeBSD$"); #include <netinet/ip6.h> #include <netinet6/in6_pcb.h> #include <netinet6/ip6_var.h> +#define TCPOUTFLAGS #include <netinet/tcp.h> #include <netinet/tcp_fsm.h> #include <netinet/tcp_seq.h> @@ -133,14 +139,14 @@ __FBSDID("$FreeBSD$"); uint32_t ctf_get_opt_tls_size(struct socket *so, uint32_t rwnd) { - struct sbtls_info *tls; + struct ktls_session *tls; uint32_t len; again: tls = so->so_snd.sb_tls_info; - len = tls->sb_params.sb_maxlen; /* max tls payload */ - len += tls->sb_params.sb_tls_hlen; /* tls header len */ - len += tls->sb_params.sb_tls_tlen; /* tls trailer len */ + len = tls->params.max_frame_len; /* max tls payload */ + len += tls->params.tls_hlen; /* tls header len */ + len += tls->params.tls_tlen; /* tls trailer len */ if ((len * 4) > rwnd) { /* * Stroke this will suck counter and what @@ -148,10 +154,10 @@ again: * TCP perspective I am not sure * what should be done... */ - if (tls->sb_params.sb_maxlen > 4096) { - tls->sb_params.sb_maxlen -= 4096; - if (tls->sb_params.sb_maxlen < 4096) - tls->sb_params.sb_maxlen = 4096; + if (tls->params.max_frame_len > 4096) { + tls->params.max_frame_len -= 4096; + if (tls->params.max_frame_len < 4096) + tls->params.max_frame_len = 4096; goto again; } } @@ -414,7 +420,13 @@ skip_vnet: * have been called (if we can). */ m->m_pkthdr.lro_nsegs = 1; - tcp_get_usecs(&tv); + if (m->m_flags & M_TSTMP_LRO) { + tv.tv_sec = m->m_pkthdr.rcv_tstmp /1000000000; + tv.tv_usec = (m->m_pkthdr.rcv_tstmp % 1000000000)/1000; + } else { + /* Should not be should we kassert instead? */ + tcp_get_usecs(&tv); + } /* Now what about next packet? */ if (m_save || has_pkt) nxt_pkt = 1; @@ -425,7 +437,7 @@ skip_vnet: if (retval) { /* We lost the lock and tcb probably */ m = m_save; - while (m) { + while(m) { m_save = m->m_nextpkt; m->m_nextpkt = NULL; m_freem(m); @@ -434,7 +446,7 @@ skip_vnet: if (no_vn == 0) CURVNET_RESTORE(); INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); - return (retval); + return(retval); } skipped_pkt: m = m_save; @@ -442,7 +454,7 @@ skipped_pkt: if (no_vn == 0) CURVNET_RESTORE(); INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); - return (retval); + return(retval); } int @@ -457,7 +469,7 @@ ctf_do_queued_segments(struct socket *so, struct tcpcb *tp, int have_pkt) tp->t_tail_pkt = NULL; if (ctf_process_inbound_raw(tp, so, m, have_pkt)) { /* We lost the tcpcb (maybe a RST came in)? */ - return (1); + return(1); } } return (0); @@ -466,14 +478,14 @@ ctf_do_queued_segments(struct socket *so, struct tcpcb *tp, int have_pkt) uint32_t ctf_outstanding(struct tcpcb *tp) { - return (tp->snd_max - tp->snd_una); + return(tp->snd_max - tp->snd_una); } uint32_t ctf_flight_size(struct tcpcb *tp, uint32_t rc_sacked) { if (rc_sacked <= ctf_outstanding(tp)) - return (ctf_outstanding(tp) - rc_sacked); + return(ctf_outstanding(tp) - rc_sacked); else { /* TSNH */ #ifdef INVARIANTS @@ -908,5 +920,5 @@ ctf_decay_count(uint32_t count, uint32_t decay) * count decay value. */ decayed_count = count - (uint32_t)perc_count; - return (decayed_count); + return(decayed_count); } diff --git a/sys/netinet/tcp_stacks/rack_bbr_common.h b/sys/netinet/tcp_stacks/rack_bbr_common.h index 822208338d67..6cb2fed7c2fa 100644 --- a/sys/netinet/tcp_stacks/rack_bbr_common.h +++ b/sys/netinet/tcp_stacks/rack_bbr_common.h @@ -1,7 +1,7 @@ #ifndef __pacer_timer_h__ #define __pacer_timer_h__ /*- - * Copyright (c) 2017 Netflix, Inc. + * Copyright (c) 2017-9 Netflix, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions diff --git a/sys/netinet/tcp_stacks/sack_filter.c b/sys/netinet/tcp_stacks/sack_filter.c index 2ef0eadfa944..c4b35d5b8ca8 100644 --- a/sys/netinet/tcp_stacks/sack_filter.c +++ b/sys/netinet/tcp_stacks/sack_filter.c @@ -1,5 +1,5 @@ /*- - * Copyright (c) 2017 Netflix, Inc. + * Copyright (c) 2017-9 Netflix, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -140,6 +140,7 @@ static int32_t is_sack_on_board(struct sack_filter *sf, struct sackblk *b) { int32_t i, cnt; + for (i = sf->sf_cur, cnt=0; cnt < SACK_FILTER_BLOCKS; cnt++) { if (sack_blk_used(sf, i)) { if (SEQ_LT(b->start, sf->sf_ack)) { @@ -150,8 +151,9 @@ is_sack_on_board(struct sack_filter *sf, struct sackblk *b) /* End back behind too */ b->end = sf->sf_ack; } - if (b->start == b->end) + if (b->start == b->end) { return(1); + } /* Jonathans Rule 1 */ if (SEQ_LEQ(sf->sf_blks[i].start, b->start) && SEQ_GEQ(sf->sf_blks[i].end, b->end)) { @@ -312,21 +314,22 @@ sack_filter_new(struct sack_filter *sf, struct sackblk *in, int numblks, tcp_seq if (num == 0) return(num); - /* Now what we are left is either + /* Now what we are left with is either * completely merged on to the board - * from the above steps, or are new + * from the above steps, or is new * and need to be added to the board * with the last one updated to current. * - * First copy it out we want to return that + * First copy it out, we want to return that * to our caller for processing. */ memcpy(in, blkboard, (num * sizeof(struct sackblk))); numblks = num; /* Now go through and add to our board as needed */ for(i=(num-1); i>=0; i--) { - if (is_sack_on_board(sf, &blkboard[i])) + if (is_sack_on_board(sf, &blkboard[i])) { continue; + } /* Add this guy its not listed */ sf->sf_cur++; sf->sf_cur %= SACK_FILTER_BLOCKS; @@ -463,25 +466,60 @@ sack_board_collapse(struct sack_filter *sf) } #ifndef _KERNEL +uint64_t saved=0; +uint64_t tot_sack_blks=0; + +static void +sack_filter_dump(FILE *out, struct sack_filter *sf) +{ + int i; + fprintf(out, " sf_ack:%u sf_bits:0x%x c:%d used:%d\n", + sf->sf_ack, sf->sf_bits, + sf->sf_cur, sf->sf_used); + + for(i=0; i<SACK_FILTER_BLOCKS; i++) { + if (sack_blk_used(sf, i)) { + fprintf(out, "Entry:%d start:%u end:%u\n", i, + sf->sf_blks[i].start, + sf->sf_blks[i].end); + } + } +} +#endif + +#ifndef _KERNEL static #endif int -sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, tcp_seq th_ack) +sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, + tcp_seq th_ack) { int32_t i, ret; if (numblks > TCP_MAX_SACK) { +#ifdef _KERNEL panic("sf:%p sb:%p Impossible number of sack blocks %d > 4\n", sf, in, numblks); +#endif return(numblks); } +#ifndef _KERNEL + if ((sf->sf_used > 1) && (no_collapse == 0)) + sack_board_collapse(sf); + +#else + if (sf->sf_used > 1) + sack_board_collapse(sf); +#endif if ((sf->sf_used == 0) && numblks) { /* * We are brand new add the blocks in * reverse order. Note we can see more * than one in new, since ack's could be lost. */ + int cnt_added = 0; + sf->sf_ack = th_ack; for(i=(numblks-1), sf->sf_cur=0; i >= 0; i--) { memcpy(&sf->sf_blks[sf->sf_cur], &in[i], sizeof(struct sackblk)); @@ -489,6 +527,7 @@ sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, tcp_se sf->sf_cur++; sf->sf_cur %= SACK_FILTER_BLOCKS; sf->sf_used++; + cnt_added++; #ifndef _KERNEL if (sf->sf_used > highest_used) highest_used = sf->sf_used; @@ -496,7 +535,8 @@ sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, tcp_se } if (sf->sf_cur) sf->sf_cur--; - return(numblks); + + return (cnt_added); } if (SEQ_GT(th_ack, sf->sf_ack)) { sack_filter_prune(sf, th_ack); @@ -509,51 +549,82 @@ sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, tcp_se } } else ret = 0; -#ifndef _KERNEL - if ((sf->sf_used > 1) && (no_collapse == 0)) - sack_board_collapse(sf); - -#else - if (sf->sf_used > 1) - sack_board_collapse(sf); - -#endif return (ret); } -#ifndef _KERNEL -uint64_t saved=0; -uint64_t tot_sack_blks=0; - -static void -sack_filter_dump(FILE *out, struct sack_filter *sf) +void +sack_filter_reject(struct sack_filter *sf, struct sackblk *in) { + /* + * Given a specified block (that had made + * it past the sack filter). Reject that + * block triming it off any sack-filter block + * that has it. Usually because the block was + * too small and did not cover a whole send. + * + * This function will only "undo" sack-blocks + * that are fresh and touch the edges of + * blocks in our filter. + */ int i; - fprintf(out, " sf_ack:%u sf_bits:0x%x c:%d used:%d\n", - sf->sf_ack, sf->sf_bits, - sf->sf_cur, sf->sf_used); for(i=0; i<SACK_FILTER_BLOCKS; i++) { - if (sack_blk_used(sf, i)) { - fprintf(out, "Entry:%d start:%u end:%u\n", i, - sf->sf_blks[i].start, - sf->sf_blks[i].end); + if (sack_blk_used(sf, i) == 0) + continue; + /* + * Now given the sack-filter block does it touch + * with one of the ends + */ + if (sf->sf_blks[i].end == in->end) { + /* The end moves back to start */ + if (SEQ_GT(in->start, sf->sf_blks[i].start)) + /* in-blk |----| */ + /* sf-blk |---------| */ + sf->sf_blks[i].end = in->start; + else { + /* It consumes this block */ + /* in-blk |---------| */ + /* sf-blk |------| */ + /* <or> */ + /* sf-blk |---------| */ + sf->sf_bits = sack_blk_clr(sf, i); + sf->sf_used--; + } + continue; + } + if (sf->sf_blks[i].start == in->start) { + if (SEQ_LT(in->end, sf->sf_blks[i].end)) { + /* in-blk |----| */ + /* sf-blk |---------| */ + sf->sf_blks[i].start = in->end; + } else { + /* It consumes this block */ + /* in-blk |----------| */ + /* sf-blk |-------| */ + /* <or> */ + /* sf-blk |----------| */ + sf->sf_bits = sack_blk_clr(sf, i); + sf->sf_used--; + } + continue; } } } +#ifndef _KERNEL + int main(int argc, char **argv) { char buffer[512]; struct sackblk blks[TCP_MAX_SACK]; FILE *err; - tcp_seq th_ack, snd_una; + tcp_seq th_ack, snd_una, snd_max = 0; struct sack_filter sf; int32_t numblks,i; int snd_una_set=0; double a, b, c; - int invalid_sack_print = 0; + int invalid_sack_print = 0; uint32_t chg_remembered=0; uint32_t sack_chg=0; char line_buf[10][256]; @@ -604,7 +675,11 @@ main(int argc, char **argv) line_buf_at++; if (strncmp(buffer, "QUIT", 4) == 0) { break; - } else if (strncmp(buffer, "DONE", 4) == 0) { + } else if (strncmp(buffer, "DUMP", 4) == 0) { + sack_filter_dump(out, &sf); + } else if (strncmp(buffer, "MAX:", 4) == 0) { + snd_max = strtoul(&buffer[4], NULL, 0); + } else if (strncmp(buffer, "COMMIT", 6) == 0) { int nn, ii; if (numblks) { uint32_t szof, tot_chg; @@ -660,6 +735,7 @@ main(int argc, char **argv) char *end=NULL; uint32_t start; uint32_t endv; + start = strtoul(&buffer[5], &end, 0); if (end) { endv = strtoul(&end[1], NULL, 0); @@ -667,6 +743,8 @@ main(int argc, char **argv) fprintf(out, "--Sack invalid skip 0 start:%u : ??\n", start); continue; } + if (SEQ_GT(endv, snd_max)) + snd_max = endv; if (SEQ_LT(endv, start)) { fprintf(out, "--Sack invalid skip 1 endv:%u < start:%u\n", endv, start); continue; @@ -678,6 +756,28 @@ main(int argc, char **argv) blks[numblks].start = start; blks[numblks].end = endv; numblks++; + } else if (strncmp(buffer, "REJ:n:n", 4) == 0) { + struct sackblk in; + char *end=NULL; + + in.start = strtoul(&buffer[4], &end, 0); + if (end) { + in.end = strtoul(&end[1], NULL, 0); + sack_filter_reject(&sf, &in); + } else + fprintf(out, "Invalid input END:A:B\n"); + } else if (strncmp(buffer, "HELP", 4) == 0) { + fprintf(out, "You can input:\n"); + fprintf(out, "SACK:S:E -- to define a sack block\n"); + fprintf(out, "RXT -- to clear the filter without changing the remembered\n"); + fprintf(out, "EXIT -- To clear the sack filter and start all fresh\n"); + fprintf(out, "ACK:N -- To advance the cum-ack to N\n"); + fprintf(out, "MAX:N -- To set send-max to N\n"); + fprintf(out, "COMMIT -- To apply the sack you built to the filter and dump the filter\n"); + fprintf(out, "DUMP -- To display the current contents of the sack filter\n"); + fprintf(out, "QUIT -- To exit this program\n"); + } else { + fprintf(out, "Command %s unknown\n", buffer); } memset(buffer, 0, sizeof(buffer)); } diff --git a/sys/netinet/tcp_stacks/sack_filter.h b/sys/netinet/tcp_stacks/sack_filter.h index 3ef986209566..2d01a0c15471 100644 --- a/sys/netinet/tcp_stacks/sack_filter.h +++ b/sys/netinet/tcp_stacks/sack_filter.h @@ -1,7 +1,7 @@ #ifndef __sack_filter_h__ #define __sack_filter_h__ /*- - * Copyright (c) 2017 Netflix, Inc. + * Copyright (c) 2017-9 Netflix, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -50,7 +50,8 @@ struct sack_filter { }; #ifdef _KERNEL void sack_filter_clear(struct sack_filter *sf, tcp_seq seq); -int sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, tcp_seq th_ack); - +int sack_filter_blks(struct sack_filter *sf, struct sackblk *in, int numblks, + tcp_seq th_ack); +void sack_filter_reject(struct sack_filter *sf, struct sackblk *in); #endif #endif diff --git a/sys/netinet/tcp_stacks/tcp_bbr.h b/sys/netinet/tcp_stacks/tcp_bbr.h new file mode 100644 index 000000000000..f09e25a18390 --- /dev/null +++ b/sys/netinet/tcp_stacks/tcp_bbr.h @@ -0,0 +1,845 @@ +/*- + * Copyright (c) 2016-9 + * Netflix Inc. All rights reserved. + * Author Randall R. Stewart + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _NETINET_TCP_BBR_H_ +#define _NETINET_TCP_BBR_H_ + +#define BBR_INITIAL_RTO 1000000 /* 1 second in micro-seconds */ +/* Send map flags */ +#define BBR_ACKED 0x0001 /* The remote endpoint acked this */ +#define BBR_WAS_RENEGED 0x0002 /* The peer reneged the ack */ +#define BBR_RXT_CLEARED 0x0004 /* ACK Cleared by the RXT timer */ +#define BBR_OVERMAX 0x0008 /* We have more retran's then we can + * fit */ +#define BBR_SACK_PASSED 0x0010 /* A sack was done above this block */ +#define BBR_WAS_SACKPASS 0x0020 /* We retransmitted due to SACK pass */ +#define BBR_HAS_FIN 0x0040 /* segment is sent with fin */ +#define BBR_TLP 0x0080 /* segment sent as tail-loss-probe */ +#define BBR_HAS_SYN 0x0100 /* segment has the syn */ +#define BBR_MARKED_LOST 0x0200 /* + * This segments is lost and + * totaled into bbr->rc_ctl.rc_lost + */ +#define BBR_RWND_COLLAPSED 0x0400 /* The peer collapsed the rwnd on the segment */ +#define BBR_NUM_OF_RETRANS 7 + +/* Defines for socket options to set pacing overheads */ +#define BBR_INCL_ENET_OH 0x01 +#define BBR_INCL_IP_OH 0x02 +#define BBR_INCL_TCP_OH 0x03 + +/* + * With the addition of both measurement algorithms + * I had to move over the size of a + * cache line (unfortunately). For now there is + * no way around this. We may be able to cut back + * at some point I hope. + */ +struct bbr_sendmap { + TAILQ_ENTRY(bbr_sendmap) r_next; /* seq number arrayed next */ + TAILQ_ENTRY(bbr_sendmap) r_tnext; /* Time of tmit based next */ + uint32_t r_start; /* Sequence number of the segment */ + uint32_t r_end; /* End seq, this is 1 beyond actually */ + + uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */ + uint32_t r_delivered; /* Delivered amount at send */ + + uint32_t r_del_time; /* The time of the last delivery update */ + uint8_t r_rtr_cnt:4, /* Retran count, index this -1 to get time + * sent */ + unused_bit:1, + r_is_drain:1, /* In a draining cycle */ + r_app_limited:1,/* We went app limited */ + r_ts_valid:1; /* Timestamp field is valid (r_del_ack_ts) */ + uint8_t r_dupack; /* Dup ack count */ + uint8_t r_in_tmap:1, /* Flag to see if its in the r_tnext array */ + r_is_smallmap:1,/* Was logged as a small-map send-map item */ + r_is_gain:1, /* Was in gain cycle */ + r_bbr_state:5; /* The BBR state at send */ + uint8_t r_limit_type; /* is this entry counted against a limit? */ + + uint16_t r_flags; /* Flags as defined above */ + uint16_t r_spare16; + uint32_t r_del_ack_ts; /* At send what timestamp of peer was (if r_ts_valid set) */ + /****************Cache line*****************/ + uint32_t r_tim_lastsent[BBR_NUM_OF_RETRANS]; + /* + * Question, should we instead just grab the sending b/w + * from the filter with the gain and store it in a + * uint64_t instead? + */ + uint32_t r_first_sent_time; /* Time of first pkt in flight sent */ + uint32_t r_pacing_delay; /* pacing delay of this send */ + uint32_t r_flight_at_send; /* flight at the time of the send */ +#ifdef _KERNEL +} __aligned(CACHE_LINE_SIZE); +#else +}; +#endif +#define BBR_LIMIT_TYPE_SPLIT 1 + +TAILQ_HEAD(bbr_head, bbr_sendmap); + +#define BBR_SEGMENT_TIME_SIZE 1500 /* How many bytes in time_between */ + +#define BBR_MIN_SEG 1460 /* MSS size */ +#define BBR_MAX_GAIN_VALUE 0xffff + +#define BBR_TIMER_FUDGE 1500 /* 1.5ms in micro seconds */ + +/* BW twiddle secret codes */ +#define BBR_RED_BW_CONGSIG 0 /* We enter recovery and set using b/w */ +#define BBR_RED_BW_RATECAL 1 /* We are calculating the loss rate */ +#define BBR_RED_BW_USELRBW 2 /* We are dropping the lower b/w with + * cDR */ +#define BBR_RED_BW_SETHIGHLOSS 3 /* We have set our highloss value at + * exit from probe-rtt */ +#define BBR_RED_BW_PE_CLREARLY 4 /* We have decided to clear the + * reduction early */ +#define BBR_RED_BW_PE_CLAFDEL 5 /* We are clearing it on schedule + * delayed */ +#define BBR_RED_BW_REC_ENDCLL 6 /* Recover exits save high if needed + * an clear to start measuring */ +#define BBR_RED_BW_PE_NOEARLY_OUT 7 /* Set pkt epoch judged that we do not + * get out of jail early */ +/* codes for just-return */ +#define BBR_JR_SENT_DATA 0 +#define BBR_JR_CWND_LIMITED 1 +#define BBR_JR_RWND_LIMITED 2 +#define BBR_JR_APP_LIMITED 3 +#define BBR_JR_ASSESSING 4 +/* For calculating a rate */ +#define BBR_CALC_BW 1 +#define BBR_CALC_LOSS 2 + +#define BBR_RTT_BY_TIMESTAMP 0 +#define BBR_RTT_BY_EXACTMATCH 1 +#define BBR_RTT_BY_EARLIER_RET 2 +#define BBR_RTT_BY_THIS_RETRAN 3 +#define BBR_RTT_BY_SOME_RETRAN 4 +#define BBR_RTT_BY_TSMATCHING 5 + +/* Markers to track where we enter persists from */ +#define BBR_PERSISTS_FROM_1 1 +#define BBR_PERSISTS_FROM_2 2 +#define BBR_PERSISTS_FROM_3 3 +#define BBR_PERSISTS_FROM_4 4 +#define BBR_PERSISTS_FROM_5 5 + +/* magic cookies to ask for the RTT */ +#define BBR_RTT_PROP 0 +#define BBR_RTT_RACK 1 +#define BBR_RTT_PKTRTT 2 +#define BBR_SRTT 3 + +#define BBR_SACKED 0 +#define BBR_CUM_ACKED 1 + +/* threshold in useconds where we consider we need a higher min cwnd */ +#define BBR_HIGH_SPEED 1000 +#define BBR_HIGHSPEED_NUM_MSS 12 + +#define MAX_REDUCE_RXT 3 /* What is the maximum times we are willing to + * reduce b/w in RTX's. Setting this has a + * multiplicative effect e.g. if we are + * reducing by 20% then setting it to 3 means + * you will have reduced the b/w estimate by > + * 60% before you stop. */ +/* + * We use the rate sample structure to + * assist in single sack/ack rate and rtt + * calculation. In the future we will expand + * this in BBR to do forward rate sample + * b/w estimation. + */ +#define BBR_RS_RTT_EMPTY 0x00000001 /* Nothing yet stored in RTT's */ +#define BBR_RS_BW_EMPTY 0x00000002 /* Nothing yet stored in cDR */ +#define BBR_RS_RTT_VALID 0x00000004 /* We have at least one valid RTT */ +#define BBR_RS_BW_VAILD 0x00000008 /* We have a valid cDR */ +#define BBR_RS_EMPTY (BBR_RS_RTT_EMPTY|BBR_RS_BW_EMPTY) +struct bbr_rtt_sample { + uint32_t rs_flags; + uint32_t rs_rtt_lowest; + uint32_t rs_rtt_lowest_sendtime; + uint32_t rs_rtt_low_seq_start; + + uint32_t rs_rtt_highest; + uint32_t rs_rtt_cnt; + + uint64_t rs_rtt_tot; + uint32_t cur_rtt; + uint32_t cur_rtt_bytecnt; + + uint32_t cur_rtt_rsmcnt; + uint32_t rc_crtt_set:1, + avail_bits:31; + uint64_t rs_cDR; +}; + +/* RTT shrink reasons */ +#define BBR_RTTS_INIT 0 +#define BBR_RTTS_NEWRTT 1 +#define BBR_RTTS_RTTPROBE 2 +#define BBR_RTTS_WASIDLE 3 +#define BBR_RTTS_PERSIST 4 +#define BBR_RTTS_REACHTAR 5 +#define BBR_RTTS_ENTERPROBE 6 +#define BBR_RTTS_SHRINK_PG 7 +#define BBR_RTTS_SHRINK_PG_FINAL 8 +#define BBR_RTTS_NEW_TARGET 9 +#define BBR_RTTS_LEAVE_DRAIN 10 +#define BBR_RTTS_RESETS_VALUES 11 + +#define BBR_NUM_RATES 5 +/* Rate flags */ +#define BBR_RT_FLAG_FREE 0x00 /* Is on the free list */ +#define BBR_RT_FLAG_INUSE 0x01 /* Has been allocated */ +#define BBR_RT_FLAG_READY 0x02 /* Ready to initiate a measurement. */ +#define BBR_RT_FLAG_CAPPED_PRE 0x04 /* Ready to cap if we send the next segment */ +#define BBR_RT_FLAG_CAPPED 0x08 /* Measurement is capped */ +#define BBR_RT_FLAG_PASTFA 0x10 /* Past the first ack. */ +#define BBR_RT_FLAG_LIMITED 0x20 /* Saw application/cwnd or rwnd limited period */ +#define BBR_RT_SEEN_A_ACK 0x40 /* A ack has been saved */ +#define BBR_RT_PREV_RTT_SET 0x80 /* There was a RTT set in */ +#define BBR_RT_PREV_SEND_TIME 0x100 /* + *There was a RTT send time set that can be used + * no snd_limits + */ +#define BBR_RT_SET_GRADIENT 0x200 +#define BBR_RT_TS_VALID 0x400 + + +struct bbr_log { + union { + struct bbr_sendmap *rsm; /* For alloc/free */ + uint64_t sb_acc; /* For out/ack or t-o */ + }; + struct tcpcb *tp; + uint32_t t_flags; + uint32_t th_seq; + uint32_t th_ack; + uint32_t snd_una; + uint32_t snd_nxt; + uint32_t snd_max; + uint32_t snd_cwnd; + uint32_t snd_wnd; + uint32_t rc_lost; + uint32_t target_cwnd; /* UU */ + uint32_t inflight; /* UU */ + uint32_t applimited; /* UU */ + /* Things for BBR */ + uint32_t delivered; /* UU */ + uint64_t cur_del_rate; /* UU */ + uint64_t delRate; /* UU */ + uint64_t rttProp; /* UU */ + uint64_t lt_bw; /* UU */ + uint32_t timeStamp; + uint32_t time; + uint32_t slot; /* UU */ + uint32_t delayed_by; + uint32_t exp_del; + uint32_t pkts_out; + uint32_t new_win; + uint32_t hptsi_gain; /* UU */ + uint32_t cwnd_gain; /* UU */ + uint32_t epoch; /* UU */ + uint32_t lt_epoch; /* UU */ + /* Sack fun */ + uint32_t blk_start[4]; /* xx */ + uint32_t blk_end[4]; + uint32_t len; /* Timeout T3=1, TLP=2, RACK=3 */ + uint8_t type; + uint8_t n_sackblks; + uint8_t applied; /* UU */ + uint8_t inhpts; /* UU */ + uint8_t ininput; /* UU */ + uint8_t use_lt_bw; /* UU */ +}; + +struct bbr_log_sysctl_out { + uint32_t bbr_log_at; + uint32_t bbr_log_max; + struct bbr_log entries[0]; +}; + +/* + * Magic numbers for logging timeout events if the + * logging is enabled. + */ +#define BBR_TO_FRM_TMR 1 +#define BBR_TO_FRM_TLP 2 +#define BBR_TO_FRM_RACK 3 +#define BBR_TO_FRM_KEEP 4 +#define BBR_TO_FRM_PERSIST 5 +#define BBR_TO_FRM_DELACK 6 + +#define BBR_SEES_STRETCH_ACK 1 +#define BBR_SEES_COMPRESSED_ACKS 2 + + +/* + * As we get each SACK we wade through the + * rc_map and mark off what is acked. + * We also increment rc_sacked as well. + * + * We also pay attention to missing entries + * based on the time and possibly mark them + * for retransmit. If we do and we are not already + * in recovery we enter recovery. In doing + * so we claer prr_delivered/holes_rxt and prr_sent_dur_rec. + * We also setup rc_next/rc_snd_nxt/rc_send_end so + * we will know where to send from. When not in + * recovery rc_next will be NULL and rc_snd_nxt should + * equal snd_max. + * + * Whenever we retransmit from recovery we increment + * rc_holes_rxt as we retran a block and mark it as retransmitted + * with the time it was sent. During non-recovery sending we + * add to our map and note the time down of any send expanding + * the rc_map at the tail and moving rc_snd_nxt up with snd_max. + * + * In recovery during SACK/ACK processing if a chunk has + * been retransmitted and it is now acked, we decrement rc_holes_rxt. + * When we retransmit from the scoreboard we use + * rc_next and rc_snd_nxt/rc_send_end to help us + * find what needs to be retran. + * + * To calculate pipe we simply take (snd_max - snd_una) + rc_holes_rxt + * This gets us the effect of RFC6675 pipe, counting twice for + * bytes retransmitted. + */ + +#define TT_BBR_FR_TMR 0x2001 + +#define BBR_SCALE 8 +#define BBR_UNIT (1 << BBR_SCALE) + +#define BBR_NUM_RTTS_FOR_DEL_LIMIT 8 /* How many pkt-rtts do we keep + * Delivery rate for */ +#define BBR_NUM_RTTS_FOR_GOOG_DEL_LIMIT 10 /* How many pkt-rtts do we keep + * Delivery rate for google */ + +#define BBR_SECONDS_NO_RTT 10 /* 10 seconds with no RTT shrinkage */ +#define BBR_PROBERTT_MAX 200 /* 200ms */ +#define BBR_PROBERTT_NUM_MSS 4 +#define BBR_STARTUP_EPOCHS 3 +#define USECS_IN_MSEC 1000 +#define BBR_TIME_TO_SECONDS(a) (a / USECS_IN_SECOND) +#define BBR_TIME_TO_MILLI(a) (a / MS_IN_USEC) + + +/* BBR keeps time in usec's so we divide by 1000 and round up */ +#define BBR_TS_TO_MS(t) ((t+999)/MS_IN_USEC) + +/* + * Locking for the rack control block. + * a) Locked by INP_WLOCK + * b) Locked by the hpts-mutex + * + */ +#define BBR_STATE_STARTUP 0x01 +#define BBR_STATE_DRAIN 0x02 +#define BBR_STATE_PROBE_BW 0x03 +#define BBR_STATE_PROBE_RTT 0x04 +#define BBR_STATE_IDLE_EXIT 0x05 + +/* Substate defines for STATE == PROBE_BW */ +#define BBR_SUB_GAIN 0 /* State 0 where we are 5/4 BBR_UNIT */ +#define BBR_SUB_DRAIN 1 /* State 1 where we are at 3/4 BBR_UNIT */ +#define BBR_SUB_LEVEL1 2 /* State 1 first BBR_UNIT */ +#define BBR_SUB_LEVEL2 3 /* State 2nd BBR_UNIT */ +#define BBR_SUB_LEVEL3 4 /* State 3rd BBR_UNIT */ +#define BBR_SUB_LEVEL4 5 /* State 4th BBR_UNIT */ +#define BBR_SUB_LEVEL5 6 /* State 5th BBR_UNIT */ +#define BBR_SUB_LEVEL6 7 /* State last BBR_UNIT */ +#define BBR_SUBSTATE_COUNT 8 + +/* Single remaining reduce log */ +#define BBR_REDUCE_AT_FR 5 + +#define BBR_BIG_LOG_SIZE 300000 + +/* Bits per second in bytes per second */ +#define FORTY_EIGHT_MBPS 6000000 /* 48 megabits in bytes */ +#define THIRTY_MBPS 3750000 /* 30 megabits in bytes */ +#define TWENTY_THREE_MBPS 2896000 +#define FIVETWELVE_MBPS 64000000 /* 512 megabits in bytes */ +#define ONE_POINT_TWO_MEG 150000 /* 1.2 megabits in bytes */ + +struct bbr_stats { + uint64_t bbr_badfr; /* 0 */ + uint64_t bbr_badfr_bytes; /* 1 */ + uint64_t bbr_saw_oerr; /* 2 */ + uint64_t bbr_saw_emsgsiz; /* 3 */ + uint64_t bbr_reorder_seen; /* 4 */ + uint64_t bbr_tlp_tot; /* 5 */ + uint64_t bbr_tlp_newdata; /* 6 */ + uint64_t bbr_offset_recovery; /* 7 */ + uint64_t bbr_tlp_retran_fail; /* 8 */ + uint64_t bbr_to_tot; /* 9 */ + uint64_t bbr_to_arm_rack; /* 10 */ + uint64_t bbr_enter_probertt; /* 11 */ + uint64_t bbr_tlp_set; /* 12 */ + uint64_t bbr_resends_set; /* 13 */ + uint64_t bbr_force_output; /* 14 */ + uint64_t bbr_to_arm_tlp; /* 15 */ + uint64_t bbr_paced_segments; /* 16 */ + uint64_t bbr_saw_enobuf; /* 17 */ + uint64_t bbr_to_alloc_failed; /* 18 */ + uint64_t bbr_to_alloc_emerg; /* 19 */ + uint64_t bbr_sack_proc_all; /* 20 */ + uint64_t bbr_sack_proc_short; /* 21 */ + uint64_t bbr_sack_proc_restart; /* 22 */ + uint64_t bbr_to_alloc; /* 23 */ + uint64_t bbr_offset_drop; /* 24 */ + uint64_t bbr_runt_sacks; /* 25 */ + uint64_t bbr_sack_passed; /* 26 */ + uint64_t bbr_rlock_left_ret0; /* 27 */ + uint64_t bbr_rlock_left_ret1; /* 28 */ + uint64_t bbr_dynamic_rwnd; /* 29 */ + uint64_t bbr_static_rwnd; /* 30 */ + uint64_t bbr_sack_blocks; /* 31 */ + uint64_t bbr_sack_blocks_skip; /* 32 */ + uint64_t bbr_sack_search_both; /* 33 */ + uint64_t bbr_sack_search_fwd; /* 34 */ + uint64_t bbr_sack_search_back; /* 35 */ + uint64_t bbr_plain_acks; /* 36 */ + uint64_t bbr_acks_with_sacks; /* 37 */ + uint64_t bbr_progress_drops; /* 38 */ + uint64_t bbr_early; /* 39 */ + uint64_t bbr_reneges_seen; /* 40 */ + uint64_t bbr_persist_reneg; /* 41 */ + uint64_t bbr_dropped_af_data; /* 42 */ + uint64_t bbr_failed_mbuf_aloc; /* 43 */ + uint64_t bbr_cwnd_limited; /* 44 */ + uint64_t bbr_rwnd_limited; /* 45 */ + uint64_t bbr_app_limited; /* 46 */ + uint64_t bbr_force_timer_start; /* 47 */ + uint64_t bbr_hpts_min_time; /* 48 */ + uint64_t bbr_meets_tso_thresh; /* 49 */ + uint64_t bbr_miss_tso_rwnd; /* 50 */ + uint64_t bbr_miss_tso_cwnd; /* 51 */ + uint64_t bbr_miss_tso_app; /* 52 */ + uint64_t bbr_miss_retran; /* 53 */ + uint64_t bbr_miss_tlp; /* 54 */ + uint64_t bbr_miss_unknown; /* 55 */ + uint64_t bbr_hdwr_rl_add_ok; /* 56 */ + uint64_t bbr_hdwr_rl_add_fail; /* 57 */ + uint64_t bbr_hdwr_rl_mod_ok; /* 58 */ + uint64_t bbr_hdwr_rl_mod_fail; /* 59 */ + uint64_t bbr_collapsed_win; /* 60 */ + uint64_t bbr_alloc_limited; /* 61 */ + uint64_t bbr_alloc_limited_conns; /* 62 */ + uint64_t bbr_split_limited; /* 63 */ +}; + +/* + * The structure bbr_opt_stats is a simple + * way to see how many options are being + * changed in the stack. + */ +struct bbr_opts_stats { + uint64_t tcp_bbr_pace_per_sec; + uint64_t tcp_bbr_pace_del_tar; + uint64_t tcp_bbr_pace_seg_max; + uint64_t tcp_bbr_pace_seg_min; + uint64_t tcp_bbr_pace_cross; + uint64_t tcp_bbr_drain_inc_extra; + uint64_t tcp_bbr_unlimited; + uint64_t tcp_bbr_iwintso; + uint64_t tcp_bbr_rec_over_hpts; + uint64_t tcp_bbr_recforce; + uint64_t tcp_bbr_startup_pg; + uint64_t tcp_bbr_drain_pg; + uint64_t tcp_bbr_rwnd_is_app; + uint64_t tcp_bbr_probe_rtt_int; + uint64_t tcp_bbr_one_retran; + uint64_t tcp_bbr_startup_loss_exit; + uint64_t tcp_bbr_use_lowgain; + uint64_t tcp_bbr_lowgain_thresh; + uint64_t tcp_bbr_lowgain_half; + uint64_t tcp_bbr_lowgain_fd; + uint64_t tcp_bbr_usedel_rate; + uint64_t tcp_bbr_min_rto; + uint64_t tcp_bbr_max_rto; + uint64_t tcp_rack_pace_max_seg; + uint64_t tcp_rack_min_to; + uint64_t tcp_rack_reord_thresh; + uint64_t tcp_rack_reord_fade; + uint64_t tcp_rack_tlp_thresh; + uint64_t tcp_rack_pkt_delay; + uint64_t tcp_bbr_startup_exit_epoch; + uint64_t tcp_bbr_ack_comp_alg; + uint64_t tcp_rack_cheat; + uint64_t tcp_iwnd_tso; + uint64_t tcp_utter_max_tso; + uint64_t tcp_hdwr_pacing; + uint64_t tcp_extra_state; + uint64_t tcp_floor_min_tso; + /* New */ + uint64_t tcp_bbr_algorithm; + uint64_t tcp_bbr_tslimits; + uint64_t tcp_bbr_probertt_len; + uint64_t tcp_bbr_probertt_gain; + uint64_t tcp_bbr_topaceout; + uint64_t tcp_use_rackcheat; + uint64_t tcp_delack; + uint64_t tcp_maxpeak; + uint64_t tcp_retran_wtso; + uint64_t tcp_data_ac; + uint64_t tcp_ts_raises; + uint64_t tcp_pacing_oh_tmr; + uint64_t tcp_pacing_oh; + uint64_t tcp_policer_det; +}; + + +#ifdef _KERNEL +#define BBR_STAT_SIZE (sizeof(struct bbr_stats)/sizeof(uint64_t)) +extern counter_u64_t bbr_stat_arry[BBR_STAT_SIZE]; +#define BBR_STAT_ADD(name, amm) counter_u64_add(bbr_stat_arry[(offsetof(struct bbr_stats, name)/sizeof(uint64_t))], (amm)) +#define BBR_STAT_INC(name) BBR_STAT_ADD(name, 1) +#define BBR_OPTS_SIZE (sizeof(struct bbr_stats)/sizeof(uint64_t)) +extern counter_u64_t bbr_opts_arry[BBR_OPTS_SIZE]; +#define BBR_OPTS_ADD(name, amm) counter_u64_add(bbr_opts_arry[(offsetof(struct bbr_opts_stats, name)/sizeof(uint64_t))], (amm)) +#define BBR_OPTS_INC(name) BBR_OPTS_ADD(name, 1) +#endif + +#define BBR_NUM_LOSS_RATES 3 +#define BBR_NUM_BW_RATES 3 + +#define BBR_RECOVERY_LOWRTT 1 +#define BBR_RECOVERY_MEDRTT 2 +#define BBR_RECOVERY_HIGHRTT 3 +#define BBR_RECOVERY_EXTREMERTT 4 + + +struct bbr_control { + /*******************************/ + /* Cache line 2 from bbr start */ + /*******************************/ + struct bbr_head rc_map; /* List of all segments Lock(a) */ + struct bbr_head rc_tmap; /* List in transmit order Lock(a) */ + struct bbr_sendmap *rc_resend; /* something we have been asked to + * resend */ + uint32_t rc_last_delay_val; /* How much we expect to delay Lock(a) */ + uint32_t rc_bbr_hptsi_gain:16, /* Current hptsi gain Lock(a) */ + rc_hpts_flags:16; /* flags on whats on the pacer wheel */ + + uint32_t rc_delivered; /* BRR delivered amount Lock(a) */ + uint32_t rc_hptsi_agg_delay; /* How much time are we behind */ + + uint32_t rc_flight_at_input; + uint32_t rc_lost_bytes; /* Total bytes currently marked lost */ + /*******************************/ + /* Cache line 3 from bbr start */ + /*******************************/ + struct time_filter rc_delrate; + /*******************************/ + /* Cache line 4 from bbr start */ + /*******************************/ + struct bbr_head rc_free; /* List of Free map entries Lock(a) */ + struct bbr_sendmap *rc_tlp_send; /* something we have been + * asked to resend */ + uint32_t rc_del_time; + uint32_t rc_target_at_state; /* Target for a state */ + + uint16_t rc_free_cnt; /* Number of free entries on the rc_free list + * Lock(a) */ + uint16_t rc_startup_pg; + + uint32_t cur_rtt; /* Last RTT from ack */ + + + uint32_t rc_went_idle_time; /* Used for persits to see if its + * probe-rtt qualified */ + uint32_t rc_pace_max_segs:17, /* How much in any single TSO we send Lock(a) */ + rc_pace_min_segs:15; /* The minimum single segment size before we enter persists */ + + uint32_t rc_rtt_shrinks; /* Time of last rtt shrinkage Lock(a) */ + uint32_t r_app_limited_until; + uint32_t rc_timer_exp; /* If a timer ticks of expiry */ + uint32_t rc_rcv_epoch_start; /* Start time of the Epoch Lock(a) */ + + /*******************************/ + /* Cache line 5 from bbr start */ + /*******************************/ + + uint32_t rc_lost_at_pktepoch; /* what the lost value was at the last + * pkt-epoch */ + uint32_t r_measurement_count; /* count of measurement applied lock(a) */ + + + uint32_t rc_last_tlp_seq; /* Last tlp sequence Lock(a) */ + uint16_t rc_reorder_shift; /* Socket option value Lock(a) */ + uint16_t rc_pkt_delay; /* Socket option value Lock(a) */ + + struct bbr_sendmap *rc_sacklast; /* sack remembered place + * Lock(a) */ + struct bbr_sendmap *rc_next; /* remembered place where we next + * retransmit at Lock(a) */ + + uint32_t rc_sacked; /* Tot sacked on scoreboard Lock(a) */ + uint32_t rc_holes_rxt; /* Tot retraned from scoreboard Lock(a) */ + + uint32_t rc_reorder_ts; /* Last time we saw reordering Lock(a) */ + uint32_t rc_init_rwnd; /* Initial rwnd when we transitioned */ + /*- --- + * used only inital and close + */ + uint32_t rc_high_rwnd; /* Highest rwnd seen */ + uint32_t rc_lowest_rtt; /* Smallest RTT we have seen */ + + uint32_t rc_last_rtt; /* Last valid measured RTT that ack'd data */ + uint32_t bbr_cross_over; + + /*******************************/ + /* Cache line 6 from bbr start */ + /*******************************/ + struct sack_filter bbr_sf; + + /*******************************/ + /* Cache line 7 from bbr start */ + /*******************************/ + struct time_filter_small rc_rttprop; + uint32_t last_inbound_ts; /* Peers last timestamp */ + + uint32_t rc_inc_tcp_oh: 1, + rc_inc_ip_oh: 1, + rc_inc_enet_oh:1, + rc_incr_tmrs:1, + restrict_growth:28; + uint32_t rc_lt_epoch_use; /* When we started lt-bw use Lock(a) */ + + uint32_t rc_recovery_start; /* Time we start recovery Lock(a) */ + uint32_t rc_lt_del; /* Delivered at lt bw sampling start Lock(a) */ + + uint64_t rc_bbr_cur_del_rate; /* Current measured delivery rate + * Lock(a) */ + + /*******************************/ + /* Cache line 8 from bbr start */ + /*******************************/ + uint32_t rc_cwnd_on_ent; /* On entry to recovery the cwnd + * Lock(a) */ + uint32_t rc_agg_early; /* aggregate amount early */ + + uint32_t rc_rcvtime; /* When we last received data Lock(a) */ + uint32_t rc_pkt_epoch_del; /* seq num that we need for RTT epoch */ + + uint32_t rc_pkt_epoch; /* Epoch based on packet RTTs */ + uint32_t rc_pkt_epoch_time; /* Time we started the pkt epoch */ + + uint32_t rc_pkt_epoch_rtt; /* RTT using the packet epoch */ + uint32_t rc_rtt_epoch; /* Current RTT epoch, it ticks every rttProp + * Lock(a) */ + uint32_t lowest_rtt; + uint32_t bbr_smallest_srtt_this_state; + + uint32_t rc_lt_epoch; /* LT epoch start of bw_sampling */ + uint32_t rc_lost_at_startup; + + uint32_t rc_bbr_state_atflight; + uint32_t rc_bbr_last_startup_epoch; /* Last startup epoch where we + * increased 20% */ + uint32_t rc_bbr_enters_probertt; /* Timestamp we entered + * probertt Lock(a) */ + uint32_t rc_lt_time; /* Time of lt sampling start Lock(a) */ + + /*******************************/ + /* Cache line 9 from bbr start */ + /*******************************/ + uint64_t rc_lt_bw; /* LT bw calculated Lock(a) */ + uint64_t rc_bbr_lastbtlbw; /* For startup, what was last btlbw I + * saw to check the 20% gain Lock(a) */ + + + uint32_t rc_bbr_cwnd_gain; /* Current cwnd gain Lock(a) */ + uint32_t rc_pkt_epoch_loss_rate; /* pkt-epoch loss rate */ + + uint32_t rc_saved_cwnd; /* Saved cwnd during Probe-rtt drain Lock(a) */ + uint32_t substate_pe; + + uint32_t rc_lost; /* Number of bytes lost Lock(a) */ + uint32_t rc_exta_time_gd; /* How much extra time we got in d/g */ + + uint32_t rc_lt_lost; /* Number of lt bytes lost at sampling start + * Lock(a) */ + uint32_t rc_bbr_state_time; + + uint32_t rc_min_to; /* Socket option value Lock(a) */ + uint32_t rc_initial_hptsi_bw; /* Our initial startup bw Lock(a) */ + + uint32_t bbr_lost_at_state; /* Temp counter debug lost value as we + * enter a state */ + /*******************************/ + /* Cache line 10 from bbr start */ + /*******************************/ + uint32_t rc_level_state_extra; + uint32_t rc_red_cwnd_pe; + const struct tcp_hwrate_limit_table *crte; + uint64_t red_bw; + + uint32_t rc_probertt_int; + uint32_t rc_probertt_srttchktim; /* Time we last did a srtt + * check */ + uint32_t gain_epoch; /* Epoch we should be out of gain */ + uint32_t rc_min_rto_ms; + + uint32_t rc_reorder_fade; /* Socket option value Lock(a) */ + uint32_t last_startup_measure; + + int32_t bbr_hptsi_per_second; + int32_t bbr_hptsi_segments_delay_tar; + + int32_t bbr_hptsi_segments_max; + uint32_t bbr_rttprobe_gain_val; + /*******************************/ + /* Cache line 11 from bbr start */ + /*******************************/ + uint32_t cur_rtt_send_time; /* Time we sent our rtt measured packet */ + uint32_t bbr_peer_tsratio; /* Our calculated ts ratio to multply */ + uint32_t bbr_ts_check_tstmp; /* When we filled it the TS that came on the ack */ + uint32_t bbr_ts_check_our_cts; /* When we filled it the cts of the send */ + uint32_t rc_tlp_rxt_last_time; + uint32_t bbr_smallest_srtt_state2; + uint32_t bbr_hdwr_cnt_noset_snt; /* count of hw pacing sends during delay */ + uint32_t startup_last_srtt; + uint32_t rc_ack_hdwr_delay; + uint32_t highest_hdwr_delay; /* Largest delay we have seen from hardware */ + uint32_t non_gain_extra; + uint32_t recovery_lr; /* The sum of the loss rate from the pe's during recovery */ + uint32_t last_in_probertt; + uint32_t flightsize_at_drain; /* In draining what was the last marked flight size */ + uint32_t rc_pe_of_prtt; /* PE we went into probe-rtt */ + uint32_t ts_in; /* ts that went with the last rtt */ + + uint16_t rc_tlp_seg_send_cnt; /* Number of times we have TLP sent + * rc_last_tlp_seq Lock(a) */ + uint16_t rc_drain_pg; + uint32_t rc_num_maps_alloced; /* num send map entries allocated */ + uint32_t rc_num_split_allocs; /* num split map entries allocated */ + uint16_t rc_num_small_maps_alloced; /* Number of sack blocks + * allocated */ + uint16_t bbr_hptsi_bytes_min; + + uint16_t bbr_hptsi_segments_floor; + uint16_t bbr_utter_max; + uint16_t bbr_google_discount; + +}; + + +struct socket; +struct tcp_bbr { + /* First cache line 0x00 */ + int32_t(*r_substate) (struct mbuf *, struct tcphdr *, + struct socket *, struct tcpcb *, struct tcpopt *, + int32_t, int32_t, uint32_t, int32_t, int32_t); /* Lock(a) */ + struct tcpcb *rc_tp; /* The tcpcb Lock(a) */ + struct inpcb *rc_inp; /* The inpcb Lock(a) */ + struct timeval rc_tv; + uint32_t rc_pacer_started; /* Time we started the pacer */ + uint16_t no_pacing_until:8, /* No pacing until N packet epochs */ + ts_can_raise:1,/* TS b/w calculations can raise the bw higher */ + skip_gain:1, /* Skip the gain cycle (hardware pacing) */ + gain_is_limited:1, /* With hardware pacing we are limiting gain */ + output_error_seen:1, + oerror_cnt:4, + hw_pacing_set:1; /* long enough has passed for us to start pacing */ + uint16_t xxx_r_ack_count; /* During recovery count of ack's received + * that added data since output */ + uint16_t bbr_segs_rcvd; /* In Segment count since we sent a ack */ + + uint8_t bbr_timer_src:4, /* Used for debugging Lock(a) */ + bbr_use_rack_cheat:1, /* Use the rack cheat */ + bbr_init_win_cheat:1, /* Send full IW for TSO */ + bbr_attempt_hdwr_pace:1,/* Try to do hardware pacing */ + bbr_hdrw_pacing:1; /* Hardware pacing is available */ + uint8_t bbr_hdw_pace_ena:1, /* Does the connection allow hardware pacing to be attempted */ + bbr_prev_in_rec:1, /* We were previously in recovery */ + pkt_conservation:1, + use_policer_detection:1, + xxx_bbr_hdw_pace_idx:4; /* If hardware pacing is on, index to slot in pace tbl */ + uint16_t r_wanted_output:1, + rtt_valid:1, + rc_timer_first:1, + rc_output_starts_timer:1, + rc_resends_use_tso:1, + rc_all_timers_stopped:1, + rc_loss_exit:1, + rc_ack_was_delayed:1, + rc_lt_is_sampling:1, + rc_filled_pipe:1, + rc_tlp_new_data:1, + rc_hit_state_1:1, + rc_ts_valid:1, + rc_prtt_set_ts:1, + rc_is_pkt_epoch_now:1, + rc_has_collapsed:1; + + uint8_t r_state:4, /* Current bbr state Lock(a) */ + r_agg_early_set:1, /* Did we get called early */ + r_init_rtt:1, + r_use_policer:1, /* For google mode only */ + r_recovery_bw:1; + uint8_t r_timer_override:1, /* pacer override Lock(a) 0/1 */ + rc_in_persist:1, + rc_lt_use_bw:1, + rc_allow_data_af_clo:1, + rc_tlp_rtx_out:1, /* A TLP is in flight */ + rc_tlp_in_progress:1, /* a TLP timer is running needed? */ + rc_use_idle_restart:1; /* Do we restart fast after idle (persist or applim) */ + uint8_t rc_bbr_state:3, /* What is the major BBR state */ + rc_bbr_substate:3, /* For probeBW state */ + r_is_v6:1, + rc_past_init_win:1; + uint8_t rc_last_options; + uint8_t rc_tlp_threshold; /* Socket option value Lock(a) */ + uint8_t rc_max_rto_sec; + uint8_t rc_cwnd_limited:1, /* We are cwnd limited */ + rc_tmr_stopped:7; /* What timers have been stopped */ + uint8_t rc_use_google:1, + rc_use_ts_limit:1, + rc_ts_data_set:1, /* We have filled a set point to determine */ + rc_ts_clock_set:1, /* We have determined the ts type */ + rc_ts_cant_be_used:1, /* We determined we can't use ts values */ + rc_ack_is_cumack:1, + rc_no_pacing:1, + alloc_limit_reported:1; + uint8_t rc_init_win; + /* Cache line 2 0x40 */ + struct bbr_control r_ctl; +#ifdef _KERNEL +} __aligned(CACHE_LINE_SIZE); +#else +}; +#endif + +#endif diff --git a/sys/netinet/tcp_stacks/tcp_rack.h b/sys/netinet/tcp_stacks/tcp_rack.h index 235951999e64..a19fc8969d9f 100644 --- a/sys/netinet/tcp_stacks/tcp_rack.h +++ b/sys/netinet/tcp_stacks/tcp_rack.h @@ -1,5 +1,5 @@ /*- - * Copyright (c) 2016 Netflix, Inc. + * Copyright (c) 2016-9 Netflix, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -28,39 +28,39 @@ #ifndef _NETINET_TCP_RACK_H_ #define _NETINET_TCP_RACK_H_ -#define RACK_ACKED 0x0001/* The remote endpoint acked this */ -#define RACK_TO_MIXED 0x0002/* A timeout occured that mixed the send order */ -#define RACK_DEFERRED 0x0004/* We can't use this for RTT calc */ -#define RACK_OVERMAX 0x0008/* We have more retran's then we can fit */ -#define RACK_SACK_PASSED 0x0010/* A sack was done above this block */ -#define RACK_WAS_SACKPASS 0x0020/* We retransmitted due to SACK pass */ -#define RACK_HAS_FIN 0x0040/* segment is sent with fin */ -#define RACK_TLP 0x0080/* segment sent as tail-loss-probe */ - +#define RACK_ACKED 0x0001/* The remote endpoint acked this */ +#define RACK_TO_MIXED 0x0002/* A timeout occured that mixed the send order - not used */ +#define RACK_DEFERRED 0x0004/* We can't use this for RTT calc - not used */ +#define RACK_OVERMAX 0x0008/* We have more retran's then we can fit */ +#define RACK_SACK_PASSED 0x0010/* A sack was done above this block */ +#define RACK_WAS_SACKPASS 0x0020/* We retransmitted due to SACK pass */ +#define RACK_HAS_FIN 0x0040/* segment is sent with fin */ +#define RACK_TLP 0x0080/* segment sent as tail-loss-probe */ +#define RACK_RWND_COLLAPSED 0x0100/* The peer collapsed the rwnd on the segment */ #define RACK_NUM_OF_RETRANS 3 #define RACK_INITIAL_RTO 1000 /* 1 second in milli seconds */ struct rack_sendmap { - TAILQ_ENTRY(rack_sendmap) r_next; /* seq number arrayed next */ - TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */ - uint32_t r_tim_lastsent[RACK_NUM_OF_RETRANS]; uint32_t r_start; /* Sequence number of the segment */ uint32_t r_end; /* End seq, this is 1 beyond actually */ + TAILQ_ENTRY(rack_sendmap) r_tnext; /* Time of transmit based next */ + RB_ENTRY(rack_sendmap) r_next; /* RB Tree next */ uint32_t r_rtr_bytes; /* How many bytes have been retransmitted */ uint16_t r_rtr_cnt; /* Retran count, index this -1 to get time * sent */ - uint8_t r_flags; /* Flags as defined above */ - uint8_t r_sndcnt; /* Retran count, not limited by - * RACK_NUM_OF_RETRANS */ + uint16_t r_flags; /* Flags as defined above */ + uint32_t r_tim_lastsent[RACK_NUM_OF_RETRANS]; + uint8_t r_dupack; /* Dup ack count */ uint8_t r_in_tmap; /* Flag to see if its in the r_tnext array */ uint8_t r_limit_type; /* is this entry counted against a limit? */ - uint8_t r_resv[2]; + uint8_t r_resv[49]; }; -#define RACK_LIMIT_TYPE_SPLIT 1 +RB_HEAD(rack_rb_tree_head, rack_sendmap); TAILQ_HEAD(rack_head, rack_sendmap); +#define RACK_LIMIT_TYPE_SPLIT 1 /* * We use the rate sample structure to @@ -136,6 +136,8 @@ struct rack_opts_stats { uint64_t rack_no_timer_in_hpts; uint64_t tcp_rack_min_pace_seg; uint64_t tcp_rack_min_pace; + uint64_t tcp_rack_cheat; + uint64_t tcp_rack_no_sack; }; #define TLP_USE_ID 1 /* Internet draft behavior */ @@ -188,15 +190,19 @@ extern counter_u64_t rack_opts_arry[RACK_OPTS_SIZE]; * b) Locked by the hpts-mutex * */ +#define RACK_GP_HIST 4 /* How much goodput history do we maintain? */ struct rack_control { /* Second cache line 0x40 from tcp_rack */ - struct rack_head rc_map;/* List of all segments Lock(a) */ + struct rack_rb_tree_head rc_mtree; /* Tree of all segments Lock(a) */ struct rack_head rc_tmap; /* List in transmit order Lock(a) */ struct rack_sendmap *rc_tlpsend; /* Remembered place for * tlp_sending Lock(a) */ struct rack_sendmap *rc_resend; /* something we have been asked to * resend */ + struct timeval rc_last_time_decay; /* SAD time decay happened here */ + uint32_t input_pkt; + uint32_t saved_input_pkt; uint32_t rc_hpts_flags; uint32_t rc_timer_exp; /* If a timer ticks of expiry */ uint32_t rc_rack_min_rtt; /* lowest RTT seen Lock(a) */ @@ -244,22 +250,32 @@ struct rack_control { * have allocated */ uint32_t rc_rcvtime; /* When we last received data */ uint32_t rc_num_split_allocs; /* num split map entries allocated */ + uint32_t rc_last_output_to; uint32_t rc_went_idle_time; struct rack_sendmap *rc_sacklast; /* sack remembered place * Lock(a) */ - struct rack_sendmap *rc_next; /* remembered place where we next - * retransmit at Lock(a) */ struct rack_sendmap *rc_rsm_at_retran; /* Debug variable kept for * cache line alignment * Lock(a) */ + struct timeval rc_last_ack; /* Cache line split 0x100 */ struct sack_filter rack_sf; /* Cache line split 0x140 */ /* Flags for various things */ + uint32_t rc_pace_max_segs; + uint32_t rc_pace_min_segs; + uint32_t rc_high_rwnd; + uint32_t ack_count; + uint32_t sack_count; + uint32_t sack_noextra_move; + uint32_t sack_moved_extra; struct rack_rtt_sample rack_rs; + uint32_t rc_tlp_rxt_last_time; + uint32_t rc_saved_cwnd; + uint32_t rc_gp_history[RACK_GP_HIST]; uint32_t rc_tlp_threshold; /* Socket option value Lock(a) */ uint16_t rc_early_recovery_segs; /* Socket option value Lock(a) */ uint16_t rc_reorder_shift; /* Socket option value Lock(a) */ @@ -270,9 +286,11 @@ struct rack_control { uint8_t rc_early_recovery; /* Socket option value Lock(a) */ uint8_t rc_prr_sendalot;/* Socket option value Lock(a) */ uint8_t rc_min_to; /* Socket option value Lock(a) */ - uint8_t rc_prr_inc_var; /* Socket option value Lock(a) */ uint8_t rc_tlp_rtx_out; /* This is TLPRtxOut in the draft */ uint8_t rc_rate_sample_method; + uint8_t rc_gp_hist_idx: 7, + rc_gp_hist_filled: 1; + }; #ifdef _KERNEL @@ -305,16 +323,22 @@ struct tcp_rack { rc_last_pto_set : 1, /* XXX not used */ rc_tlp_in_progress : 1, rc_always_pace : 1, /* Socket option value Lock(a) */ - rc_timer_up : 1; /* The rack timer is up flag Lock(a) */ - uint8_t r_idle_reduce_largest : 1, - r_enforce_min_pace : 2, - r_min_pace_seg_thresh : 5; + tlp_timer_up : 1; /* The tlp timer is up flag Lock(a) */ + uint8_t r_enforce_min_pace : 2, + rc_has_collapsed : 1, + r_rep_attack : 1, + r_rep_reverse : 1, + r_xxx_min_pace_seg_thresh : 3; uint8_t rack_tlp_threshold_use; uint8_t rc_allow_data_af_clo: 1, delayed_ack : 1, + set_pacing_done_a_iw : 1, + use_rack_cheat : 1, alloc_limit_reported : 1, - rc_avail : 5; - uint8_t r_resv[2]; /* Fill to cache line boundary */ + sack_attack_disable : 1, + do_detection : 1, + rc_avail : 1; + uint16_t rack_per_of_gp; /* Cache line 2 0x40 */ struct rack_control r_ctl; } __aligned(CACHE_LINE_SIZE); |