/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2007, Myricom Inc. * Copyright (c) 2008, Intel Corporation. * Copyright (c) 2012 The FreeBSD Foundation * Copyright (c) 2016 Mellanox Technologies. * All rights reserved. * * Portions of this software were developed by Bjoern Zeeb * under sponsorship from the FreeBSD Foundation. * * 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 AUTHOR 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 AUTHOR 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. */ #include __FBSDID("$FreeBSD$"); #include "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static MALLOC_DEFINE(M_LRO, "LRO", "LRO control structures"); #define TCP_LRO_UPDATE_CSUM 1 #ifndef TCP_LRO_UPDATE_CSUM #define TCP_LRO_INVALID_CSUM 0x0000 #endif static void tcp_lro_rx_done(struct lro_ctrl *lc); static int tcp_lro_rx2(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum, int use_hash); SYSCTL_NODE(_net_inet_tcp, OID_AUTO, lro, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "TCP LRO"); static long tcplro_stacks_wanting_mbufq = 0; counter_u64_t tcp_inp_lro_direct_queue; counter_u64_t tcp_inp_lro_wokeup_queue; counter_u64_t tcp_inp_lro_compressed; counter_u64_t tcp_inp_lro_single_push; counter_u64_t tcp_inp_lro_locks_taken; counter_u64_t tcp_inp_lro_sack_wake; static unsigned tcp_lro_entries = TCP_LRO_ENTRIES; static int32_t hold_lock_over_compress = 0; SYSCTL_INT(_net_inet_tcp_lro, OID_AUTO, hold_lock, CTLFLAG_RW, &hold_lock_over_compress, 0, "Do we hold the lock over the compress of mbufs?"); SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, entries, CTLFLAG_RDTUN | CTLFLAG_MPSAFE, &tcp_lro_entries, 0, "default number of LRO entries"); SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, fullqueue, CTLFLAG_RD, &tcp_inp_lro_direct_queue, "Number of lro's fully queued to transport"); SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, wokeup, CTLFLAG_RD, &tcp_inp_lro_wokeup_queue, "Number of lro's where we woke up transport via hpts"); SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, compressed, CTLFLAG_RD, &tcp_inp_lro_compressed, "Number of lro's compressed and sent to transport"); SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, single, CTLFLAG_RD, &tcp_inp_lro_single_push, "Number of lro's sent with single segment"); SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, lockcnt, CTLFLAG_RD, &tcp_inp_lro_locks_taken, "Number of lro's inp_wlocks taken"); SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, sackwakeups, CTLFLAG_RD, &tcp_inp_lro_sack_wake, "Number of wakeups caused by sack/fin"); void tcp_lro_reg_mbufq(void) { atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, 1); } void tcp_lro_dereg_mbufq(void) { atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, -1); } static __inline void tcp_lro_active_insert(struct lro_ctrl *lc, struct lro_head *bucket, struct lro_entry *le) { LIST_INSERT_HEAD(&lc->lro_active, le, next); LIST_INSERT_HEAD(bucket, le, hash_next); } static __inline void tcp_lro_active_remove(struct lro_entry *le) { LIST_REMOVE(le, next); /* active list */ LIST_REMOVE(le, hash_next); /* hash bucket */ } int tcp_lro_init(struct lro_ctrl *lc) { return (tcp_lro_init_args(lc, NULL, tcp_lro_entries, 0)); } int tcp_lro_init_args(struct lro_ctrl *lc, struct ifnet *ifp, unsigned lro_entries, unsigned lro_mbufs) { struct lro_entry *le; size_t size; unsigned i, elements; lc->lro_bad_csum = 0; lc->lro_queued = 0; lc->lro_flushed = 0; lc->lro_mbuf_count = 0; lc->lro_mbuf_max = lro_mbufs; lc->lro_cnt = lro_entries; lc->lro_ackcnt_lim = TCP_LRO_ACKCNT_MAX; lc->lro_length_lim = TCP_LRO_LENGTH_MAX; lc->ifp = ifp; LIST_INIT(&lc->lro_free); LIST_INIT(&lc->lro_active); /* create hash table to accelerate entry lookup */ if (lro_entries > lro_mbufs) elements = lro_entries; else elements = lro_mbufs; lc->lro_hash = phashinit_flags(elements, M_LRO, &lc->lro_hashsz, HASH_NOWAIT); if (lc->lro_hash == NULL) { memset(lc, 0, sizeof(*lc)); return (ENOMEM); } /* compute size to allocate */ size = (lro_mbufs * sizeof(struct lro_mbuf_sort)) + (lro_entries * sizeof(*le)); lc->lro_mbuf_data = (struct lro_mbuf_sort *) malloc(size, M_LRO, M_NOWAIT | M_ZERO); /* check for out of memory */ if (lc->lro_mbuf_data == NULL) { free(lc->lro_hash, M_LRO); memset(lc, 0, sizeof(*lc)); return (ENOMEM); } /* compute offset for LRO entries */ le = (struct lro_entry *) (lc->lro_mbuf_data + lro_mbufs); /* setup linked list */ for (i = 0; i != lro_entries; i++) LIST_INSERT_HEAD(&lc->lro_free, le + i, next); return (0); } static struct tcphdr * tcp_lro_get_th(struct lro_entry *le, struct mbuf *m) { struct ether_header *eh; struct tcphdr *th = NULL; #ifdef INET6 struct ip6_hdr *ip6 = NULL; /* Keep compiler happy. */ #endif #ifdef INET struct ip *ip4 = NULL; /* Keep compiler happy. */ #endif eh = mtod(m, struct ether_header *); switch (le->eh_type) { #ifdef INET6 case ETHERTYPE_IPV6: ip6 = (struct ip6_hdr *)(eh + 1); th = (struct tcphdr *)(ip6 + 1); break; #endif #ifdef INET case ETHERTYPE_IP: ip4 = (struct ip *)(eh + 1); th = (struct tcphdr *)(ip4 + 1); break; #endif } return (th); } void tcp_lro_free(struct lro_ctrl *lc) { struct lro_entry *le; unsigned x; /* reset LRO free list */ LIST_INIT(&lc->lro_free); /* free active mbufs, if any */ while ((le = LIST_FIRST(&lc->lro_active)) != NULL) { tcp_lro_active_remove(le); m_freem(le->m_head); } /* free hash table */ free(lc->lro_hash, M_LRO); lc->lro_hash = NULL; lc->lro_hashsz = 0; /* free mbuf array, if any */ for (x = 0; x != lc->lro_mbuf_count; x++) m_freem(lc->lro_mbuf_data[x].mb); lc->lro_mbuf_count = 0; /* free allocated memory, if any */ free(lc->lro_mbuf_data, M_LRO); lc->lro_mbuf_data = NULL; } static uint16_t tcp_lro_csum_th(struct tcphdr *th) { uint32_t ch; uint16_t *p, l; ch = th->th_sum = 0x0000; l = th->th_off; p = (uint16_t *)th; while (l > 0) { ch += *p; p++; ch += *p; p++; l--; } while (ch > 0xffff) ch = (ch >> 16) + (ch & 0xffff); return (ch & 0xffff); } static uint16_t tcp_lro_rx_csum_fixup(struct lro_entry *le, void *l3hdr, struct tcphdr *th, uint16_t tcp_data_len, uint16_t csum) { uint32_t c; uint16_t cs; c = csum; /* Remove length from checksum. */ switch (le->eh_type) { #ifdef INET6 case ETHERTYPE_IPV6: { struct ip6_hdr *ip6; ip6 = (struct ip6_hdr *)l3hdr; if (le->append_cnt == 0) cs = ip6->ip6_plen; else { uint32_t cx; cx = ntohs(ip6->ip6_plen); cs = in6_cksum_pseudo(ip6, cx, ip6->ip6_nxt, 0); } break; } #endif #ifdef INET case ETHERTYPE_IP: { struct ip *ip4; ip4 = (struct ip *)l3hdr; if (le->append_cnt == 0) cs = ip4->ip_len; else { cs = in_addword(ntohs(ip4->ip_len) - sizeof(*ip4), IPPROTO_TCP); cs = in_pseudo(ip4->ip_src.s_addr, ip4->ip_dst.s_addr, htons(cs)); } break; } #endif default: cs = 0; /* Keep compiler happy. */ } cs = ~cs; c += cs; /* Remove TCP header csum. */ cs = ~tcp_lro_csum_th(th); c += cs; while (c > 0xffff) c = (c >> 16) + (c & 0xffff); return (c & 0xffff); } static void tcp_lro_rx_done(struct lro_ctrl *lc) { struct lro_entry *le; while ((le = LIST_FIRST(&lc->lro_active)) != NULL) { tcp_lro_active_remove(le); tcp_lro_flush(lc, le); } } void tcp_lro_flush_inactive(struct lro_ctrl *lc, const struct timeval *timeout) { struct lro_entry *le, *le_tmp; struct timeval tv; if (LIST_EMPTY(&lc->lro_active)) return; getmicrouptime(&tv); timevalsub(&tv, timeout); LIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) { if (timevalcmp(&tv, &le->mtime, >=)) { tcp_lro_active_remove(le); tcp_lro_flush(lc, le); } } } #ifdef INET6 static int tcp_lro_rx_ipv6(struct lro_ctrl *lc, struct mbuf *m, struct ip6_hdr *ip6, struct tcphdr **th) { /* XXX-BZ we should check the flow-label. */ /* XXX-BZ We do not yet support ext. hdrs. */ if (ip6->ip6_nxt != IPPROTO_TCP) return (TCP_LRO_NOT_SUPPORTED); /* Find the TCP header. */ *th = (struct tcphdr *)(ip6 + 1); return (0); } #endif #ifdef INET static int tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4, struct tcphdr **th) { int csum_flags; uint16_t csum; if (ip4->ip_p != IPPROTO_TCP) return (TCP_LRO_NOT_SUPPORTED); /* Ensure there are no options. */ if ((ip4->ip_hl << 2) != sizeof (*ip4)) return (TCP_LRO_CANNOT); /* .. and the packet is not fragmented. */ if (ip4->ip_off & htons(IP_MF|IP_OFFMASK)) return (TCP_LRO_CANNOT); /* Legacy IP has a header checksum that needs to be correct. */ csum_flags = m->m_pkthdr.csum_flags; if (csum_flags & CSUM_IP_CHECKED) { if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) { lc->lro_bad_csum++; return (TCP_LRO_CANNOT); } } else { csum = in_cksum_hdr(ip4); if (__predict_false((csum) != 0)) { lc->lro_bad_csum++; return (TCP_LRO_CANNOT); } } /* Find the TCP header (we assured there are no IP options). */ *th = (struct tcphdr *)(ip4 + 1); return (0); } #endif static void tcp_lro_log(struct tcpcb *tp, struct lro_ctrl *lc, struct lro_entry *le, struct mbuf *m, int frm, int32_t tcp_data_len, uint32_t th_seq , uint32_t th_ack, uint16_t th_win) { if (tp->t_logstate != TCP_LOG_STATE_OFF) { union tcp_log_stackspecific log; struct timeval tv; uint32_t cts; cts = tcp_get_usecs(&tv); memset(&log, 0, sizeof(union tcp_log_stackspecific)); log.u_bbr.flex8 = frm; log.u_bbr.flex1 = tcp_data_len; if (m) log.u_bbr.flex2 = m->m_pkthdr.len; else log.u_bbr.flex2 = 0; log.u_bbr.flex3 = le->append_cnt; log.u_bbr.flex4 = le->p_len; log.u_bbr.flex5 = le->m_head->m_pkthdr.len; log.u_bbr.delRate = le->m_head->m_flags; log.u_bbr.rttProp = le->m_head->m_pkthdr.rcv_tstmp; log.u_bbr.flex6 = lc->lro_length_lim; log.u_bbr.flex7 = lc->lro_ackcnt_lim; log.u_bbr.inflight = th_seq; log.u_bbr.timeStamp = cts; log.u_bbr.epoch = le->next_seq; log.u_bbr.delivered = th_ack; log.u_bbr.lt_epoch = le->ack_seq; log.u_bbr.pacing_gain = th_win; log.u_bbr.cwnd_gain = le->window; log.u_bbr.cur_del_rate = (uintptr_t)m; log.u_bbr.bw_inuse = (uintptr_t)le->m_head; log.u_bbr.pkts_out = le->mbuf_cnt; /* Total mbufs added */ log.u_bbr.applimited = le->ulp_csum; log.u_bbr.lost = le->mbuf_appended; TCP_LOG_EVENTP(tp, NULL, &tp->t_inpcb->inp_socket->so_rcv, &tp->t_inpcb->inp_socket->so_snd, TCP_LOG_LRO, 0, 0, &log, false, &tv); } } static void tcp_flush_out_le(struct tcpcb *tp, struct lro_ctrl *lc, struct lro_entry *le, int locked) { if (le->append_cnt > 1) { struct tcphdr *th; uint16_t p_len; p_len = htons(le->p_len); switch (le->eh_type) { #ifdef INET6 case ETHERTYPE_IPV6: { struct ip6_hdr *ip6; ip6 = le->le_ip6; ip6->ip6_plen = p_len; th = (struct tcphdr *)(ip6 + 1); le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR; le->p_len += ETHER_HDR_LEN + sizeof(*ip6); break; } #endif #ifdef INET case ETHERTYPE_IP: { struct ip *ip4; uint32_t cl; uint16_t c; ip4 = le->le_ip4; /* Fix IP header checksum for new length. */ c = ~ip4->ip_sum; cl = c; c = ~ip4->ip_len; cl += c + p_len; while (cl > 0xffff) cl = (cl >> 16) + (cl & 0xffff); c = cl; ip4->ip_sum = ~c; ip4->ip_len = p_len; th = (struct tcphdr *)(ip4 + 1); le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID; le->p_len += ETHER_HDR_LEN; break; } #endif default: th = NULL; /* Keep compiler happy. */ } le->m_head->m_pkthdr.csum_data = 0xffff; le->m_head->m_pkthdr.len = le->p_len; /* Incorporate the latest ACK into the TCP header. */ th->th_ack = le->ack_seq; th->th_win = le->window; /* Incorporate latest timestamp into the TCP header. */ if (le->timestamp != 0) { uint32_t *ts_ptr; ts_ptr = (uint32_t *)(th + 1); ts_ptr[1] = htonl(le->tsval); ts_ptr[2] = le->tsecr; } /* Update the TCP header checksum. */ le->ulp_csum += p_len; le->ulp_csum += tcp_lro_csum_th(th); while (le->ulp_csum > 0xffff) le->ulp_csum = (le->ulp_csum >> 16) + (le->ulp_csum & 0xffff); th->th_sum = (le->ulp_csum & 0xffff); th->th_sum = ~th->th_sum; if (tp && locked) { tcp_lro_log(tp, lc, le, NULL, 7, 0, 0, 0, 0); } } /* * Break any chain, this is not set to NULL on the singleton * case m_nextpkt points to m_head. Other case set them * m_nextpkt to NULL in push_and_replace. */ le->m_head->m_nextpkt = NULL; le->m_head->m_pkthdr.lro_nsegs = le->append_cnt; if (tp && locked) { tcp_lro_log(tp, lc, le, le->m_head, 8, 0, 0, 0, 0); } (*lc->ifp->if_input)(lc->ifp, le->m_head); lc->lro_queued += le->append_cnt; } static void tcp_set_le_to_m(struct lro_ctrl *lc, struct lro_entry *le, struct mbuf *m) { struct ether_header *eh; void *l3hdr = NULL; /* Keep compiler happy. */ struct tcphdr *th; #ifdef INET6 struct ip6_hdr *ip6 = NULL; /* Keep compiler happy. */ #endif #ifdef INET struct ip *ip4 = NULL; /* Keep compiler happy. */ #endif uint32_t *ts_ptr; int error, l, ts_failed = 0; uint16_t tcp_data_len; uint16_t csum; error = -1; eh = mtod(m, struct ether_header *); /* * We must reset the other pointers since the mbuf * we were pointing too is about to go away. */ switch (le->eh_type) { #ifdef INET6 case ETHERTYPE_IPV6: l3hdr = ip6 = (struct ip6_hdr *)(eh + 1); error = tcp_lro_rx_ipv6(lc, m, ip6, &th); le->le_ip6 = ip6; le->source_ip6 = ip6->ip6_src; le->dest_ip6 = ip6->ip6_dst; le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN - sizeof(*ip6); break; #endif #ifdef INET case ETHERTYPE_IP: l3hdr = ip4 = (struct ip *)(eh + 1); error = tcp_lro_rx_ipv4(lc, m, ip4, &th); le->le_ip4 = ip4; le->source_ip4 = ip4->ip_src.s_addr; le->dest_ip4 = ip4->ip_dst.s_addr; le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN; break; #endif } KASSERT(error == 0, ("%s: le=%p tcp_lro_rx_xxx failed\n", __func__, le)); ts_ptr = (uint32_t *)(th + 1); l = (th->th_off << 2); l -= sizeof(*th); if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) || (*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16| TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)))) { /* We have failed to find a timestamp some other option? */ ts_failed = 1; } if ((l != 0) && (ts_failed == 0)) { le->timestamp = 1; le->tsval = ntohl(*(ts_ptr + 1)); le->tsecr = *(ts_ptr + 2); } else le->timestamp = 0; le->source_port = th->th_sport; le->dest_port = th->th_dport; /* Pull out the csum */ tcp_data_len = m->m_pkthdr.lro_len; le->next_seq = ntohl(th->th_seq) + tcp_data_len; le->ack_seq = th->th_ack; le->window = th->th_win; csum = th->th_sum; /* Setup the data pointers */ le->m_head = m; le->m_tail = m_last(m); le->append_cnt = 0; le->ulp_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len, ~csum); le->append_cnt++; th->th_sum = csum; /* Restore checksum on first packet. */ } static void tcp_push_and_replace(struct tcpcb *tp, struct lro_ctrl *lc, struct lro_entry *le, struct mbuf *m, int locked) { /* * Push up the stack the current le and replace * it with m. */ struct mbuf *msave; /* Grab off the next and save it */ msave = le->m_head->m_nextpkt; le->m_head->m_nextpkt = NULL; /* Now push out the old le entry */ tcp_flush_out_le(tp, lc, le, locked); /* * Now to replace the data properly in the le * we have to reset the tcp header and * other fields. */ tcp_set_le_to_m(lc, le, m); /* Restore the next list */ m->m_nextpkt = msave; } static void tcp_lro_condense(struct tcpcb *tp, struct lro_ctrl *lc, struct lro_entry *le, int locked) { /* * Walk through the mbuf chain we * have on tap and compress/condense * as required. */ uint32_t *ts_ptr; struct mbuf *m; struct tcphdr *th; uint16_t tcp_data_len, csum_upd; int l; /* * First we must check the lead (m_head) * we must make sure that it is *not* * something that should be sent up * right away (sack etc). */ again: m = le->m_head->m_nextpkt; if (m == NULL) { /* Just the one left */ return; } th = tcp_lro_get_th(le, le->m_head); KASSERT(th != NULL, ("le:%p m:%p th comes back NULL?", le, le->m_head)); l = (th->th_off << 2); l -= sizeof(*th); ts_ptr = (uint32_t *)(th + 1); if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) || (*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16| TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)))) { /* * Its not the timestamp. We can't * use this guy as the head. */ le->m_head->m_nextpkt = m->m_nextpkt; tcp_push_and_replace(tp, lc, le, m, locked); goto again; } if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0) { /* * Make sure that previously seen segements/ACKs are delivered * before this segment, e.g. FIN. */ le->m_head->m_nextpkt = m->m_nextpkt; tcp_push_and_replace(tp, lc, le, m, locked); goto again; } while((m = le->m_head->m_nextpkt) != NULL) { /* * condense m into le, first * pull m out of the list. */ le->m_head->m_nextpkt = m->m_nextpkt; m->m_nextpkt = NULL; /* Setup my data */ tcp_data_len = m->m_pkthdr.lro_len; th = tcp_lro_get_th(le, m); KASSERT(th != NULL, ("le:%p m:%p th comes back NULL?", le, m)); ts_ptr = (uint32_t *)(th + 1); l = (th->th_off << 2); l -= sizeof(*th); if (tp && locked) { tcp_lro_log(tp, lc, le, m, 1, 0, 0, 0, 0); } if (le->append_cnt >= lc->lro_ackcnt_lim) { if (tp && locked) { tcp_lro_log(tp, lc, le, m, 2, 0, 0, 0, 0); } tcp_push_and_replace(tp, lc, le, m, locked); goto again; } if (le->p_len > (lc->lro_length_lim - tcp_data_len)) { /* Flush now if appending will result in overflow. */ if (tp && locked) { tcp_lro_log(tp, lc, le, m, 3, tcp_data_len, 0, 0, 0); } tcp_push_and_replace(tp, lc, le, m, locked); goto again; } if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) || (*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16| TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)))) { /* * Maybe a sack in the new one? We need to * start all over after flushing the * current le. We will go up to the beginning * and flush it (calling the replace again possibly * or just returning). */ tcp_push_and_replace(tp, lc, le, m, locked); goto again; } if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0) { tcp_push_and_replace(tp, lc, le, m, locked); goto again; } if (l != 0) { uint32_t tsval = ntohl(*(ts_ptr + 1)); /* Make sure timestamp values are increasing. */ if (TSTMP_GT(le->tsval, tsval)) { tcp_push_and_replace(tp, lc, le, m, locked); goto again; } le->tsval = tsval; le->tsecr = *(ts_ptr + 2); } /* Try to append the new segment. */ if (__predict_false(ntohl(th->th_seq) != le->next_seq || (tcp_data_len == 0 && le->ack_seq == th->th_ack && le->window == th->th_win))) { /* Out of order packet or duplicate ACK. */ if (tp && locked) { tcp_lro_log(tp, lc, le, m, 4, tcp_data_len, ntohl(th->th_seq), th->th_ack, th->th_win); } tcp_push_and_replace(tp, lc, le, m, locked); goto again; } if (tcp_data_len || SEQ_GT(ntohl(th->th_ack), ntohl(le->ack_seq))) { le->next_seq += tcp_data_len; le->ack_seq = th->th_ack; le->window = th->th_win; } else if (th->th_ack == le->ack_seq) { le->window = WIN_MAX(le->window, th->th_win); } csum_upd = m->m_pkthdr.lro_csum; le->ulp_csum += csum_upd; if (tcp_data_len == 0) { le->append_cnt++; le->mbuf_cnt--; if (tp && locked) { tcp_lro_log(tp, lc, le, m, 5, tcp_data_len, ntohl(th->th_seq), th->th_ack, th->th_win); } m_freem(m); continue; } le->append_cnt++; le->mbuf_appended++; le->p_len += tcp_data_len; /* * Adjust the mbuf so that m_data points to the first byte of * the ULP payload. Adjust the mbuf to avoid complications and * append new segment to existing mbuf chain. */ m_adj(m, m->m_pkthdr.len - tcp_data_len); if (tp && locked) { tcp_lro_log(tp, lc, le, m, 6, tcp_data_len, ntohl(th->th_seq), th->th_ack, th->th_win); } m_demote_pkthdr(m); le->m_tail->m_next = m; le->m_tail = m_last(m); } } #ifdef TCPHPTS static void tcp_queue_pkts(struct tcpcb *tp, struct lro_entry *le) { if (tp->t_in_pkt == NULL) { /* Nothing yet there */ tp->t_in_pkt = le->m_head; tp->t_tail_pkt = le->m_last_mbuf; } else { /* Already some there */ tp->t_tail_pkt->m_nextpkt = le->m_head; tp->t_tail_pkt = le->m_last_mbuf; } le->m_head = NULL; le->m_last_mbuf = NULL; } #endif void tcp_lro_flush(struct lro_ctrl *lc, struct lro_entry *le) { struct tcpcb *tp = NULL; int locked = 0; #ifdef TCPHPTS struct inpcb *inp = NULL; int need_wakeup = 0, can_queue = 0; struct epoch_tracker et; /* Now lets lookup the inp first */ CURVNET_SET(lc->ifp->if_vnet); /* * XXXRRS Currently the common input handler for * mbuf queuing cannot handle VLAN Tagged. This needs * to be fixed and the or condition removed (i.e. the * common code should do the right lookup for the vlan * tag and anything else that the vlan_input() does). */ if ((tcplro_stacks_wanting_mbufq == 0) || (le->m_head->m_flags & M_VLANTAG)) goto skip_lookup; NET_EPOCH_ENTER(et); switch (le->eh_type) { #ifdef INET6 case ETHERTYPE_IPV6: inp = in6_pcblookup(&V_tcbinfo, &le->source_ip6, le->source_port, &le->dest_ip6,le->dest_port, INPLOOKUP_WLOCKPCB, lc->ifp); break; #endif #ifdef INET case ETHERTYPE_IP: inp = in_pcblookup(&V_tcbinfo, le->le_ip4->ip_src, le->source_port, le->le_ip4->ip_dst, le->dest_port, INPLOOKUP_WLOCKPCB, lc->ifp); break; #endif } NET_EPOCH_EXIT(et); if (inp && ((inp->inp_flags & (INP_DROPPED|INP_TIMEWAIT)) || (inp->inp_flags2 & INP_FREED))) { /* We don't want this guy */ INP_WUNLOCK(inp); inp = NULL; } if (inp && (inp->inp_flags2 & INP_SUPPORTS_MBUFQ)) { /* The transport supports mbuf queuing */ can_queue = 1; if (le->need_wakeup || ((inp->inp_in_input == 0) && ((inp->inp_flags2 & INP_MBUF_QUEUE_READY) == 0))) { /* * Either the transport is off on a keep-alive * (it has the queue_ready flag clear and its * not already been woken) or the entry has * some urgent thing (FIN or possibly SACK blocks). * This means we need to wake the transport up by * putting it on the input pacer. */ need_wakeup = 1; if ((inp->inp_flags2 & INP_DONT_SACK_QUEUE) && (le->need_wakeup != 1)) { /* * Prohibited from a sack wakeup. */ need_wakeup = 0; } } /* Do we need to be awoken due to lots of data or acks? */ if ((le->tcp_tot_p_len >= lc->lro_length_lim) || (le->mbuf_cnt >= lc->lro_ackcnt_lim)) need_wakeup = 1; } if (inp) { tp = intotcpcb(inp); locked = 1; } else tp = NULL; if (can_queue) { counter_u64_add(tcp_inp_lro_direct_queue, 1); tcp_lro_log(tp, lc, le, NULL, 22, need_wakeup, inp->inp_flags2, inp->inp_in_input, le->need_wakeup); tcp_queue_pkts(tp, le); if (need_wakeup) { /* * We must get the guy to wakeup via * hpts. */ counter_u64_add(tcp_inp_lro_wokeup_queue, 1); if (le->need_wakeup) counter_u64_add(tcp_inp_lro_sack_wake, 1); tcp_queue_to_input(inp); } } if (inp && (hold_lock_over_compress == 0)) { /* Unlock it */ locked = 0; tp = NULL; counter_u64_add(tcp_inp_lro_locks_taken, 1); INP_WUNLOCK(inp); } if (can_queue == 0) { skip_lookup: #endif /* TCPHPTS */ /* Old fashioned lro method */ if (le->m_head != le->m_last_mbuf) { counter_u64_add(tcp_inp_lro_compressed, 1); tcp_lro_condense(tp, lc, le, locked); } else counter_u64_add(tcp_inp_lro_single_push, 1); tcp_flush_out_le(tp, lc, le, locked); #ifdef TCPHPTS } if (inp && locked) { counter_u64_add(tcp_inp_lro_locks_taken, 1); INP_WUNLOCK(inp); } CURVNET_RESTORE(); #endif lc->lro_flushed++; bzero(le, sizeof(*le)); LIST_INSERT_HEAD(&lc->lro_free, le, next); } #ifdef HAVE_INLINE_FLSLL #define tcp_lro_msb_64(x) (1ULL << (flsll(x) - 1)) #else static inline uint64_t tcp_lro_msb_64(uint64_t x) { x |= (x >> 1); x |= (x >> 2); x |= (x >> 4); x |= (x >> 8); x |= (x >> 16); x |= (x >> 32); return (x & ~(x >> 1)); } #endif /* * The tcp_lro_sort() routine is comparable to qsort(), except it has * a worst case complexity limit of O(MIN(N,64)*N), where N is the * number of elements to sort and 64 is the number of sequence bits * available. The algorithm is bit-slicing the 64-bit sequence number, * sorting one bit at a time from the most significant bit until the * least significant one, skipping the constant bits. This is * typically called a radix sort. */ static void tcp_lro_sort(struct lro_mbuf_sort *parray, uint32_t size) { struct lro_mbuf_sort temp; uint64_t ones; uint64_t zeros; uint32_t x; uint32_t y; repeat: /* for small arrays insertion sort is faster */ if (size <= 12) { for (x = 1; x < size; x++) { temp = parray[x]; for (y = x; y > 0 && temp.seq < parray[y - 1].seq; y--) parray[y] = parray[y - 1]; parray[y] = temp; } return; } /* compute sequence bits which are constant */ ones = 0; zeros = 0; for (x = 0; x != size; x++) { ones |= parray[x].seq; zeros |= ~parray[x].seq; } /* compute bits which are not constant into "ones" */ ones &= zeros; if (ones == 0) return; /* pick the most significant bit which is not constant */ ones = tcp_lro_msb_64(ones); /* * Move entries having cleared sequence bits to the beginning * of the array: */ for (x = y = 0; y != size; y++) { /* skip set bits */ if (parray[y].seq & ones) continue; /* swap entries */ temp = parray[x]; parray[x] = parray[y]; parray[y] = temp; x++; } KASSERT(x != 0 && x != size, ("Memory is corrupted\n")); /* sort zeros */ tcp_lro_sort(parray, x); /* sort ones */ parray += x; size -= x; goto repeat; } void tcp_lro_flush_all(struct lro_ctrl *lc) { uint64_t seq; uint64_t nseq; unsigned x; /* check if no mbufs to flush */ if (lc->lro_mbuf_count == 0) goto done; /* sort all mbufs according to stream */ tcp_lro_sort(lc->lro_mbuf_data, lc->lro_mbuf_count); /* input data into LRO engine, stream by stream */ seq = 0; for (x = 0; x != lc->lro_mbuf_count; x++) { struct mbuf *mb; /* get mbuf */ mb = lc->lro_mbuf_data[x].mb; /* get sequence number, masking away the packet index */ nseq = lc->lro_mbuf_data[x].seq & (-1ULL << 24); /* check for new stream */ if (seq != nseq) { seq = nseq; /* flush active streams */ tcp_lro_rx_done(lc); } /* add packet to LRO engine */ if (tcp_lro_rx2(lc, mb, 0, 0) != 0) { /* input packet to network layer */ (*lc->ifp->if_input)(lc->ifp, mb); lc->lro_queued++; lc->lro_flushed++; } } done: /* flush active streams */ tcp_lro_rx_done(lc); lc->lro_mbuf_count = 0; } static void lro_set_mtime(struct timeval *tv, struct timespec *ts) { tv->tv_sec = ts->tv_sec; tv->tv_usec = ts->tv_nsec / 1000; } static int tcp_lro_rx2(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum, int use_hash) { struct lro_entry *le; struct ether_header *eh; #ifdef INET6 struct ip6_hdr *ip6 = NULL; /* Keep compiler happy. */ #endif #ifdef INET struct ip *ip4 = NULL; /* Keep compiler happy. */ #endif struct tcphdr *th; void *l3hdr = NULL; /* Keep compiler happy. */ uint32_t *ts_ptr; tcp_seq seq; int error, ip_len, l; uint16_t eh_type, tcp_data_len, need_flush; struct lro_head *bucket; struct timespec arrv; /* We expect a contiguous header [eh, ip, tcp]. */ if ((m->m_flags & (M_TSTMP_LRO|M_TSTMP)) == 0) { /* If no hardware or arrival stamp on the packet add arrival */ nanouptime(&arrv); m->m_pkthdr.rcv_tstmp = (arrv.tv_sec * 1000000000) + arrv.tv_nsec; m->m_flags |= M_TSTMP_LRO; } eh = mtod(m, struct ether_header *); eh_type = ntohs(eh->ether_type); switch (eh_type) { #ifdef INET6 case ETHERTYPE_IPV6: { CURVNET_SET(lc->ifp->if_vnet); if (V_ip6_forwarding != 0) { /* XXX-BZ stats but changing lro_ctrl is a problem. */ CURVNET_RESTORE(); return (TCP_LRO_CANNOT); } CURVNET_RESTORE(); l3hdr = ip6 = (struct ip6_hdr *)(eh + 1); error = tcp_lro_rx_ipv6(lc, m, ip6, &th); if (error != 0) return (error); tcp_data_len = ntohs(ip6->ip6_plen); ip_len = sizeof(*ip6) + tcp_data_len; break; } #endif #ifdef INET case ETHERTYPE_IP: { CURVNET_SET(lc->ifp->if_vnet); if (V_ipforwarding != 0) { /* XXX-BZ stats but changing lro_ctrl is a problem. */ CURVNET_RESTORE(); return (TCP_LRO_CANNOT); } CURVNET_RESTORE(); l3hdr = ip4 = (struct ip *)(eh + 1); error = tcp_lro_rx_ipv4(lc, m, ip4, &th); if (error != 0) return (error); ip_len = ntohs(ip4->ip_len); tcp_data_len = ip_len - sizeof(*ip4); break; } #endif /* XXX-BZ what happens in case of VLAN(s)? */ default: return (TCP_LRO_NOT_SUPPORTED); } /* * If the frame is padded beyond the end of the IP packet, then we must * trim the extra bytes off. */ l = m->m_pkthdr.len - (ETHER_HDR_LEN + ip_len); if (l != 0) { if (l < 0) /* Truncated packet. */ return (TCP_LRO_CANNOT); m_adj(m, -l); } /* * Check TCP header constraints. */ if (th->th_flags & TH_SYN) return (TCP_LRO_CANNOT); if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0) need_flush = 1; else need_flush = 0; l = (th->th_off << 2); ts_ptr = (uint32_t *)(th + 1); tcp_data_len -= l; l -= sizeof(*th); if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) || (*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16| TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)))) { /* * We have an option besides Timestamps, maybe * it is a sack (most likely) which means we * will probably need to wake up a sleeper (if * the guy does queueing). */ need_flush = 2; } /* If the driver did not pass in the checksum, set it now. */ if (csum == 0x0000) csum = th->th_sum; seq = ntohl(th->th_seq); if (!use_hash) { bucket = &lc->lro_hash[0]; } else if (M_HASHTYPE_ISHASH(m)) { bucket = &lc->lro_hash[m->m_pkthdr.flowid % lc->lro_hashsz]; } else { uint32_t hash; switch (eh_type) { #ifdef INET case ETHERTYPE_IP: hash = ip4->ip_src.s_addr + ip4->ip_dst.s_addr; break; #endif #ifdef INET6 case ETHERTYPE_IPV6: hash = ip6->ip6_src.s6_addr32[0] + ip6->ip6_dst.s6_addr32[0]; hash += ip6->ip6_src.s6_addr32[1] + ip6->ip6_dst.s6_addr32[1]; hash += ip6->ip6_src.s6_addr32[2] + ip6->ip6_dst.s6_addr32[2]; hash += ip6->ip6_src.s6_addr32[3] + ip6->ip6_dst.s6_addr32[3]; break; #endif default: hash = 0; break; } hash += th->th_sport + th->th_dport; bucket = &lc->lro_hash[hash % lc->lro_hashsz]; } /* Try to find a matching previous segment. */ LIST_FOREACH(le, bucket, hash_next) { if (le->eh_type != eh_type) continue; if (le->source_port != th->th_sport || le->dest_port != th->th_dport) continue; switch (eh_type) { #ifdef INET6 case ETHERTYPE_IPV6: if (bcmp(&le->source_ip6, &ip6->ip6_src, sizeof(struct in6_addr)) != 0 || bcmp(&le->dest_ip6, &ip6->ip6_dst, sizeof(struct in6_addr)) != 0) continue; break; #endif #ifdef INET case ETHERTYPE_IP: if (le->source_ip4 != ip4->ip_src.s_addr || le->dest_ip4 != ip4->ip_dst.s_addr) continue; break; #endif } if (tcp_data_len || SEQ_GT(ntohl(th->th_ack), ntohl(le->ack_seq)) || (th->th_ack == le->ack_seq)) { m->m_pkthdr.lro_len = tcp_data_len; } else { /* no data and old ack */ m_freem(m); return (0); } if (need_flush) le->need_wakeup = need_flush; /* Save of the data only csum */ m->m_pkthdr.rcvif = lc->ifp; m->m_pkthdr.lro_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len, ~csum); th->th_sum = csum; /* Restore checksum */ /* Save off the tail I am appending too (prev) */ le->m_prev_last = le->m_last_mbuf; /* Mark me in the last spot */ le->m_last_mbuf->m_nextpkt = m; /* Now set the tail to me */ le->m_last_mbuf = m; le->mbuf_cnt++; m->m_nextpkt = NULL; /* Add to the total size of data */ le->tcp_tot_p_len += tcp_data_len; lro_set_mtime(&le->mtime, &arrv); return (0); } /* Try to find an empty slot. */ if (LIST_EMPTY(&lc->lro_free)) return (TCP_LRO_NO_ENTRIES); /* Start a new segment chain. */ le = LIST_FIRST(&lc->lro_free); LIST_REMOVE(le, next); tcp_lro_active_insert(lc, bucket, le); lro_set_mtime(&le->mtime, &arrv); /* Start filling in details. */ switch (eh_type) { #ifdef INET6 case ETHERTYPE_IPV6: le->le_ip6 = ip6; le->source_ip6 = ip6->ip6_src; le->dest_ip6 = ip6->ip6_dst; le->eh_type = eh_type; le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN - sizeof(*ip6); break; #endif #ifdef INET case ETHERTYPE_IP: le->le_ip4 = ip4; le->source_ip4 = ip4->ip_src.s_addr; le->dest_ip4 = ip4->ip_dst.s_addr; le->eh_type = eh_type; le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN; break; #endif } le->source_port = th->th_sport; le->dest_port = th->th_dport; le->next_seq = seq + tcp_data_len; le->ack_seq = th->th_ack; le->window = th->th_win; if (l != 0) { le->timestamp = 1; le->tsval = ntohl(*(ts_ptr + 1)); le->tsecr = *(ts_ptr + 2); } KASSERT(le->ulp_csum == 0, ("%s: le=%p le->ulp_csum=0x%04x\n", __func__, le, le->ulp_csum)); le->append_cnt = 0; le->ulp_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len, ~csum); le->append_cnt++; th->th_sum = csum; /* Restore checksum */ le->m_head = m; m->m_pkthdr.rcvif = lc->ifp; le->mbuf_cnt = 1; if (need_flush) le->need_wakeup = need_flush; else le->need_wakeup = 0; le->m_tail = m_last(m); le->m_last_mbuf = m; m->m_nextpkt = NULL; le->m_prev_last = NULL; /* * We keep the total size here for cross checking when we may need * to flush/wakeup in the MBUF_QUEUE case. */ le->tcp_tot_p_len = tcp_data_len; m->m_pkthdr.lro_len = tcp_data_len; return (0); } int tcp_lro_rx(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum) { return tcp_lro_rx2(lc, m, csum, 1); } void tcp_lro_queue_mbuf(struct lro_ctrl *lc, struct mbuf *mb) { struct timespec arrv; /* sanity checks */ if (__predict_false(lc->ifp == NULL || lc->lro_mbuf_data == NULL || lc->lro_mbuf_max == 0)) { /* packet drop */ m_freem(mb); return; } /* check if packet is not LRO capable */ if (__predict_false(mb->m_pkthdr.csum_flags == 0 || (lc->ifp->if_capenable & IFCAP_LRO) == 0)) { /* input packet to network layer */ (*lc->ifp->if_input) (lc->ifp, mb); return; } /* Arrival Stamp the packet */ if ((mb->m_flags & M_TSTMP) == 0) { /* If no hardware or arrival stamp on the packet add arrival */ nanouptime(&arrv); mb->m_pkthdr.rcv_tstmp = ((arrv.tv_sec * 1000000000) + arrv.tv_nsec); mb->m_flags |= M_TSTMP_LRO; } /* create sequence number */ lc->lro_mbuf_data[lc->lro_mbuf_count].seq = (((uint64_t)M_HASHTYPE_GET(mb)) << 56) | (((uint64_t)mb->m_pkthdr.flowid) << 24) | ((uint64_t)lc->lro_mbuf_count); /* enter mbuf */ lc->lro_mbuf_data[lc->lro_mbuf_count].mb = mb; /* flush if array is full */ if (__predict_false(++lc->lro_mbuf_count == lc->lro_mbuf_max)) tcp_lro_flush_all(lc); } /* end */