/*-
* Copyright (c) 2016-2020 Netflix, Inc.
*
* 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 */
/* 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
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 initial 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, uint8_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
