1 /*-
2 * Copyright (c) 2016-2018 Netflix, Inc.
3 * Copyright (c) 2016-2021 Mellanox Technologies.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27 #include <sys/cdefs.h>
28 #include "opt_inet.h"
29 #include "opt_inet6.h"
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
35 #include <sys/mbuf.h>
36 #include <sys/socket.h>
37 #include <sys/socketvar.h>
38 #include <sys/sysctl.h>
39
40 #include <net/if.h>
41 #include <net/if_var.h>
42 #include <net/if_private.h>
43 #include <net/ethernet.h>
44 #include <net/bpf.h>
45 #include <net/vnet.h>
46 #include <net/if_dl.h>
47 #include <net/if_media.h>
48 #include <net/if_types.h>
49 #include <net/infiniband.h>
50 #include <net/if_lagg.h>
51 #include <net/pfil.h>
52
53 #include <netinet/in.h>
54 #include <netinet/in_kdtrace.h>
55 #include <netinet/ip6.h>
56 #include <netinet/ip.h>
57 #include <netinet/ip_var.h>
58 #include <netinet/in_pcb.h>
59 #include <netinet6/in6_pcb.h>
60 #include <netinet6/ip6_var.h>
61 #include <netinet/tcp.h>
62 #include <netinet/tcp_lro.h>
63 #include <netinet/tcp_var.h>
64 #include <netinet/tcp_hpts.h>
65 #ifdef TCP_BLACKBOX
66 #include <netinet/tcp_log_buf.h>
67 #endif
68
69 static void
build_ack_entry(struct tcp_ackent * ae,struct tcphdr * th,struct mbuf * m,uint32_t * ts_ptr,uint16_t iptos)70 build_ack_entry(struct tcp_ackent *ae, struct tcphdr *th, struct mbuf *m,
71 uint32_t *ts_ptr, uint16_t iptos)
72 {
73 /*
74 * Given a TCP ACK, summarize it down into the small TCP ACK
75 * entry.
76 */
77 ae->timestamp = m->m_pkthdr.rcv_tstmp;
78 ae->flags = 0;
79 if (m->m_flags & M_TSTMP_LRO)
80 ae->flags |= TSTMP_LRO;
81 else if (m->m_flags & M_TSTMP)
82 ae->flags |= TSTMP_HDWR;
83 ae->seq = th->th_seq;
84 ae->ack = th->th_ack;
85 ae->flags |= tcp_get_flags(th);
86 if (ts_ptr != NULL) {
87 ae->ts_value = ntohl(ts_ptr[1]);
88 ae->ts_echo = ntohl(ts_ptr[2]);
89 ae->flags |= HAS_TSTMP;
90 }
91 ae->win = th->th_win;
92 ae->codepoint = iptos;
93 }
94
95 static inline bool
tcp_lro_ack_valid(struct mbuf * m,struct tcphdr * th,uint32_t ** ppts,bool * other_opts)96 tcp_lro_ack_valid(struct mbuf *m, struct tcphdr *th, uint32_t **ppts, bool *other_opts)
97 {
98 /*
99 * This function returns two bits of valuable information.
100 * a) Is what is present capable of being ack-compressed,
101 * we can ack-compress if there is no options or just
102 * a timestamp option, and of course the th_flags must
103 * be correct as well.
104 * b) Our other options present such as SACK. This is
105 * used to determine if we want to wakeup or not.
106 */
107 bool ret = true;
108
109 switch (th->th_off << 2) {
110 case (sizeof(*th) + TCPOLEN_TSTAMP_APPA):
111 *ppts = (uint32_t *)(th + 1);
112 /* Check if we have only one timestamp option. */
113 if (**ppts == TCP_LRO_TS_OPTION)
114 *other_opts = false;
115 else {
116 *other_opts = true;
117 ret = false;
118 }
119 break;
120 case (sizeof(*th)):
121 /* No options. */
122 *ppts = NULL;
123 *other_opts = false;
124 break;
125 default:
126 *ppts = NULL;
127 *other_opts = true;
128 ret = false;
129 break;
130 }
131 /* For ACKCMP we only accept ACK, PUSH, ECE and CWR. */
132 if ((tcp_get_flags(th) & ~(TH_ACK | TH_PUSH | TH_ECE | TH_CWR)) != 0)
133 ret = false;
134 /* If it has data on it we cannot compress it */
135 if (m->m_pkthdr.lro_tcp_d_len)
136 ret = false;
137
138 /* ACK flag must be set. */
139 if (!(tcp_get_flags(th) & TH_ACK))
140 ret = false;
141 return (ret);
142 }
143
144 static bool
tcp_lro_check_wake_status(struct tcpcb * tp)145 tcp_lro_check_wake_status(struct tcpcb *tp)
146 {
147
148 if (tp->t_fb->tfb_early_wake_check != NULL)
149 return ((tp->t_fb->tfb_early_wake_check)(tp));
150 return (false);
151 }
152
153 #ifdef TCP_BLACKBOX
154 static void
tcp_lro_log(struct tcpcb * tp,const struct lro_ctrl * lc,const struct lro_entry * le,const struct mbuf * m,int frm,int32_t tcp_data_len,uint32_t th_seq,uint32_t th_ack,uint16_t th_win)155 tcp_lro_log(struct tcpcb *tp, const struct lro_ctrl *lc,
156 const struct lro_entry *le, const struct mbuf *m,
157 int frm, int32_t tcp_data_len, uint32_t th_seq,
158 uint32_t th_ack, uint16_t th_win)
159 {
160 if (tcp_bblogging_on(tp)) {
161 union tcp_log_stackspecific log;
162 struct timeval tv, btv;
163 uint32_t cts;
164
165 cts = tcp_get_usecs(&tv);
166 memset(&log, 0, sizeof(union tcp_log_stackspecific));
167 log.u_bbr.flex8 = frm;
168 log.u_bbr.flex1 = tcp_data_len;
169 if (m)
170 log.u_bbr.flex2 = m->m_pkthdr.len;
171 else
172 log.u_bbr.flex2 = 0;
173 if (le->m_head) {
174 log.u_bbr.flex3 = le->m_head->m_pkthdr.lro_nsegs;
175 log.u_bbr.flex4 = le->m_head->m_pkthdr.lro_tcp_d_len;
176 log.u_bbr.flex5 = le->m_head->m_pkthdr.len;
177 log.u_bbr.delRate = le->m_head->m_flags;
178 log.u_bbr.rttProp = le->m_head->m_pkthdr.rcv_tstmp;
179 }
180 log.u_bbr.inflight = th_seq;
181 log.u_bbr.delivered = th_ack;
182 log.u_bbr.timeStamp = cts;
183 log.u_bbr.epoch = le->next_seq;
184 log.u_bbr.lt_epoch = le->ack_seq;
185 log.u_bbr.pacing_gain = th_win;
186 log.u_bbr.cwnd_gain = le->window;
187 log.u_bbr.lost = curcpu;
188 log.u_bbr.cur_del_rate = (uintptr_t)m;
189 log.u_bbr.bw_inuse = (uintptr_t)le->m_head;
190 bintime2timeval(&lc->lro_last_queue_time, &btv);
191 log.u_bbr.flex6 = tcp_tv_to_usectick(&btv);
192 log.u_bbr.flex7 = le->compressed;
193 log.u_bbr.pacing_gain = le->uncompressed;
194 if (in_epoch(net_epoch_preempt))
195 log.u_bbr.inhpts = 1;
196 else
197 log.u_bbr.inhpts = 0;
198 TCP_LOG_EVENTP(tp, NULL, &tptosocket(tp)->so_rcv,
199 &tptosocket(tp)->so_snd,
200 TCP_LOG_LRO, 0, 0, &log, false, &tv);
201 }
202 }
203 #endif
204
205 static struct mbuf *
tcp_lro_get_last_if_ackcmp(struct lro_ctrl * lc,struct lro_entry * le,struct tcpcb * tp,int32_t * new_m,bool can_append_old_cmp)206 tcp_lro_get_last_if_ackcmp(struct lro_ctrl *lc, struct lro_entry *le,
207 struct tcpcb *tp, int32_t *new_m, bool can_append_old_cmp)
208 {
209 struct mbuf *m;
210
211 /* Look at the last mbuf if any in queue */
212 if (can_append_old_cmp) {
213 m = STAILQ_LAST(&tp->t_inqueue, mbuf, m_stailqpkt);
214 if (m != NULL && (m->m_flags & M_ACKCMP) != 0) {
215 if (M_TRAILINGSPACE(m) >= sizeof(struct tcp_ackent)) {
216 #ifdef TCP_BLACKBOX
217 tcp_lro_log(tp, lc, le, NULL, 23, 0, 0, 0, 0);
218 #endif
219 *new_m = 0;
220 counter_u64_add(tcp_extra_mbuf, 1);
221 return (m);
222 } else {
223 /* Mark we ran out of space */
224 tp->t_flags2 |= TF2_MBUF_L_ACKS;
225 }
226 }
227 }
228 /* Decide mbuf size. */
229 #ifdef TCP_BLACKBOX
230 tcp_lro_log(tp, lc, le, NULL, 21, 0, 0, 0, 0);
231 #endif
232 if (tp->t_flags2 & TF2_MBUF_L_ACKS)
233 m = m_getcl(M_NOWAIT, MT_DATA, M_ACKCMP | M_PKTHDR);
234 else
235 m = m_gethdr(M_NOWAIT, MT_DATA);
236
237 if (__predict_false(m == NULL)) {
238 counter_u64_add(tcp_would_have_but, 1);
239 return (NULL);
240 }
241 counter_u64_add(tcp_comp_total, 1);
242 m->m_pkthdr.rcvif = lc->ifp;
243 m->m_flags |= M_ACKCMP;
244 *new_m = 1;
245 return (m);
246 }
247
248 /*
249 * Do BPF tap for either ACK_CMP packets or MBUF QUEUE type packets
250 * and strip all, but the IPv4/IPv6 header.
251 */
252 static bool
do_bpf_strip_and_compress(struct tcpcb * tp,struct lro_ctrl * lc,struct lro_entry * le,struct mbuf ** pp,struct mbuf ** cmp,struct mbuf ** mv_to,bool * should_wake,bool bpf_req,bool lagg_bpf_req,struct ifnet * lagg_ifp,bool can_append_old_cmp)253 do_bpf_strip_and_compress(struct tcpcb *tp, struct lro_ctrl *lc,
254 struct lro_entry *le, struct mbuf **pp, struct mbuf **cmp,
255 struct mbuf **mv_to, bool *should_wake, bool bpf_req, bool lagg_bpf_req,
256 struct ifnet *lagg_ifp, bool can_append_old_cmp)
257 {
258 union {
259 void *ptr;
260 struct ip *ip4;
261 struct ip6_hdr *ip6;
262 } l3;
263 struct mbuf *m;
264 struct mbuf *nm;
265 struct tcphdr *th;
266 struct tcp_ackent *ack_ent;
267 uint32_t *ts_ptr;
268 int32_t n_mbuf;
269 bool other_opts, can_compress;
270 uint8_t lro_type;
271 uint16_t iptos;
272 int tcp_hdr_offset;
273 int idx;
274
275 /* Get current mbuf. */
276 m = *pp;
277
278 /* Let the BPF see the packet */
279 if (__predict_false(bpf_req))
280 ETHER_BPF_MTAP(lc->ifp, m);
281
282 if (__predict_false(lagg_bpf_req))
283 ETHER_BPF_MTAP(lagg_ifp, m);
284
285 tcp_hdr_offset = m->m_pkthdr.lro_tcp_h_off;
286 lro_type = le->inner.data.lro_type;
287 switch (lro_type) {
288 case LRO_TYPE_NONE:
289 lro_type = le->outer.data.lro_type;
290 switch (lro_type) {
291 case LRO_TYPE_IPV4_TCP:
292 tcp_hdr_offset -= sizeof(*le->outer.ip4);
293 m->m_pkthdr.lro_etype = ETHERTYPE_IP;
294 IP_PROBE(receive, NULL, NULL, le->outer.ip4, lc->ifp,
295 le->outer.ip4, NULL);
296 break;
297 case LRO_TYPE_IPV6_TCP:
298 tcp_hdr_offset -= sizeof(*le->outer.ip6);
299 m->m_pkthdr.lro_etype = ETHERTYPE_IPV6;
300 IP_PROBE(receive, NULL, NULL, le->outer.ip6, lc->ifp,
301 NULL, le->outer.ip6);
302 break;
303 default:
304 goto compressed;
305 }
306 break;
307 case LRO_TYPE_IPV4_TCP:
308 switch (le->outer.data.lro_type) {
309 case LRO_TYPE_IPV4_UDP:
310 IP_PROBE(receive, NULL, NULL, le->outer.ip4, lc->ifp,
311 le->outer.ip4, NULL);
312 UDP_PROBE(receive, NULL, NULL, le->outer.ip4, NULL,
313 le->outer.udp);
314 break;
315 case LRO_TYPE_IPV6_UDP:
316 IP_PROBE(receive, NULL, NULL, le->outer.ip6, lc->ifp,
317 NULL, le->outer.ip6);
318 UDP_PROBE(receive, NULL, NULL, le->outer.ip6, NULL,
319 le->outer.udp);
320 break;
321 default:
322 __assert_unreachable();
323 break;
324 }
325 tcp_hdr_offset -= sizeof(*le->outer.ip4);
326 m->m_pkthdr.lro_etype = ETHERTYPE_IP;
327 IP_PROBE(receive, NULL, NULL, le->inner.ip4, NULL,
328 le->inner.ip4, NULL);
329 break;
330 case LRO_TYPE_IPV6_TCP:
331 switch (le->outer.data.lro_type) {
332 case LRO_TYPE_IPV4_UDP:
333 IP_PROBE(receive, NULL, NULL, le->outer.ip4, lc->ifp,
334 le->outer.ip4, NULL);
335 UDP_PROBE(receive, NULL, NULL, le->outer.ip4, NULL,
336 le->outer.udp);
337 break;
338 case LRO_TYPE_IPV6_UDP:
339 IP_PROBE(receive, NULL, NULL, le->outer.ip6, lc->ifp,
340 NULL, le->outer.ip6);
341 UDP_PROBE(receive, NULL, NULL, le->outer.ip6, NULL,
342 le->outer.udp);
343 break;
344 default:
345 __assert_unreachable();
346 break;
347 }
348 tcp_hdr_offset -= sizeof(*le->outer.ip6);
349 m->m_pkthdr.lro_etype = ETHERTYPE_IPV6;
350 IP_PROBE(receive, NULL, NULL, le->inner.ip6, NULL, NULL,
351 le->inner.ip6);
352 break;
353 default:
354 goto compressed;
355 }
356
357 MPASS(tcp_hdr_offset >= 0);
358
359 m_adj(m, tcp_hdr_offset);
360 m->m_flags |= M_LRO_EHDRSTRP;
361 m->m_flags &= ~M_ACKCMP;
362 m->m_pkthdr.lro_tcp_h_off -= tcp_hdr_offset;
363
364 th = tcp_lro_get_th(m);
365
366 th->th_sum = 0; /* TCP checksum is valid. */
367 tcp_fields_to_host(th);
368 TCP_PROBE5(receive, NULL, tp, m, tp, th);
369
370 /* Check if ACK can be compressed */
371 can_compress = tcp_lro_ack_valid(m, th, &ts_ptr, &other_opts);
372
373 /* Now lets look at the should wake states */
374 if ((other_opts == true) &&
375 ((tp->t_flags2 & TF2_DONT_SACK_QUEUE) == 0)) {
376 /*
377 * If there are other options (SACK?) and the
378 * tcp endpoint has not expressly told us it does
379 * not care about SACKS, then we should wake up.
380 */
381 *should_wake = true;
382 } else if (*should_wake == false) {
383 /* Wakeup override check if we are false here */
384 *should_wake = tcp_lro_check_wake_status(tp);
385 }
386 /* Is the ack compressable? */
387 if (can_compress == false)
388 goto done;
389 /* Does the TCP endpoint support ACK compression? */
390 if ((tp->t_flags2 & TF2_MBUF_ACKCMP) == 0)
391 goto done;
392
393 /* Lets get the TOS/traffic class field */
394 l3.ptr = mtod(m, void *);
395 switch (lro_type) {
396 case LRO_TYPE_IPV4_TCP:
397 iptos = l3.ip4->ip_tos;
398 break;
399 case LRO_TYPE_IPV6_TCP:
400 iptos = IPV6_TRAFFIC_CLASS(l3.ip6);
401 break;
402 default:
403 iptos = 0; /* Keep compiler happy. */
404 break;
405 }
406 /* Now lets get space if we don't have some already */
407 if (*cmp == NULL) {
408 new_one:
409 nm = tcp_lro_get_last_if_ackcmp(lc, le, tp, &n_mbuf,
410 can_append_old_cmp);
411 if (__predict_false(nm == NULL))
412 goto done;
413 *cmp = nm;
414 if (n_mbuf) {
415 /*
416 * Link in the new cmp ack to our in-order place,
417 * first set our cmp ack's next to where we are.
418 */
419 nm->m_nextpkt = m;
420 (*pp) = nm;
421 /*
422 * Set it up so mv_to is advanced to our
423 * compressed ack. This way the caller can
424 * advance pp to the right place.
425 */
426 *mv_to = nm;
427 /*
428 * Advance it here locally as well.
429 */
430 pp = &nm->m_nextpkt;
431 }
432 } else {
433 /* We have one already we are working on */
434 nm = *cmp;
435 if (M_TRAILINGSPACE(nm) < sizeof(struct tcp_ackent)) {
436 /* We ran out of space */
437 tp->t_flags2 |= TF2_MBUF_L_ACKS;
438 goto new_one;
439 }
440 }
441 MPASS(M_TRAILINGSPACE(nm) >= sizeof(struct tcp_ackent));
442 counter_u64_add(tcp_inp_lro_compressed, 1);
443 le->compressed++;
444 /* We can add in to the one on the tail */
445 ack_ent = mtod(nm, struct tcp_ackent *);
446 idx = (nm->m_len / sizeof(struct tcp_ackent));
447 build_ack_entry(&ack_ent[idx], th, m, ts_ptr, iptos);
448
449 /* Bump the size of both pkt-hdr and len */
450 nm->m_len += sizeof(struct tcp_ackent);
451 nm->m_pkthdr.len += sizeof(struct tcp_ackent);
452 compressed:
453 /* Advance to next mbuf before freeing. */
454 *pp = m->m_nextpkt;
455 m->m_nextpkt = NULL;
456 m_freem(m);
457 return (true);
458 done:
459 counter_u64_add(tcp_uncomp_total, 1);
460 le->uncompressed++;
461 return (false);
462 }
463
464 static void
tcp_queue_pkts(struct tcpcb * tp,struct lro_entry * le)465 tcp_queue_pkts(struct tcpcb *tp, struct lro_entry *le)
466 {
467
468 INP_WLOCK_ASSERT(tptoinpcb(tp));
469
470 STAILQ_HEAD(, mbuf) q = { le->m_head,
471 &STAILQ_NEXT(le->m_last_mbuf, m_stailqpkt) };
472 STAILQ_CONCAT(&tp->t_inqueue, &q);
473 le->m_head = NULL;
474 le->m_last_mbuf = NULL;
475 }
476
477 static struct tcpcb *
tcp_lro_lookup(struct ifnet * ifp,struct lro_parser * pa)478 tcp_lro_lookup(struct ifnet *ifp, struct lro_parser *pa)
479 {
480 struct inpcb *inp;
481
482 CURVNET_ASSERT_SET();
483 switch (pa->data.lro_type) {
484 #ifdef INET6
485 case LRO_TYPE_IPV6_TCP:
486 inp = in6_pcblookup(&V_tcbinfo,
487 &pa->data.s_addr.v6,
488 pa->data.s_port,
489 &pa->data.d_addr.v6,
490 pa->data.d_port,
491 INPLOOKUP_WLOCKPCB,
492 ifp);
493 break;
494 #endif
495 #ifdef INET
496 case LRO_TYPE_IPV4_TCP:
497 inp = in_pcblookup(&V_tcbinfo,
498 pa->data.s_addr.v4,
499 pa->data.s_port,
500 pa->data.d_addr.v4,
501 pa->data.d_port,
502 INPLOOKUP_WLOCKPCB,
503 ifp);
504 break;
505 #endif
506 default:
507 return (NULL);
508 }
509
510 return (intotcpcb(inp));
511 }
512
513 static int
_tcp_lro_flush_tcphpts(struct lro_ctrl * lc,struct lro_entry * le)514 _tcp_lro_flush_tcphpts(struct lro_ctrl *lc, struct lro_entry *le)
515 {
516 struct tcpcb *tp;
517 struct mbuf **pp, *cmp, *mv_to;
518 struct ifnet *lagg_ifp;
519 bool bpf_req, lagg_bpf_req, should_wake, can_append_old_cmp;
520
521 /* Check if packet doesn't belongs to our network interface. */
522 if ((tcplro_stacks_wanting_mbufq == 0) ||
523 (le->outer.data.vlan_id != 0) ||
524 (le->inner.data.lro_type != LRO_TYPE_NONE))
525 return (TCP_LRO_CANNOT);
526
527 #ifdef INET6
528 /*
529 * Be proactive about unspecified IPv6 address in source. As
530 * we use all-zero to indicate unbounded/unconnected pcb,
531 * unspecified IPv6 address can be used to confuse us.
532 *
533 * Note that packets with unspecified IPv6 destination is
534 * already dropped in ip6_input.
535 */
536 if (__predict_false(le->outer.data.lro_type == LRO_TYPE_IPV6_TCP &&
537 IN6_IS_ADDR_UNSPECIFIED(&le->outer.data.s_addr.v6)))
538 return (TCP_LRO_CANNOT);
539
540 if (__predict_false(le->inner.data.lro_type == LRO_TYPE_IPV6_TCP &&
541 IN6_IS_ADDR_UNSPECIFIED(&le->inner.data.s_addr.v6)))
542 return (TCP_LRO_CANNOT);
543 #endif
544
545 CURVNET_SET(lc->ifp->if_vnet);
546 /*
547 * Ensure that there are no packet filter hooks which would normally
548 * being triggered in ether_demux(), ip_input(), or ip6_input().
549 */
550 if (
551 #ifdef INET
552 PFIL_HOOKED_IN(V_inet_pfil_head) ||
553 #endif
554 #ifdef INET6
555 PFIL_HOOKED_IN(V_inet6_pfil_head) ||
556 #endif
557 PFIL_HOOKED_IN(V_link_pfil_head)) {
558 CURVNET_RESTORE();
559 return (TCP_LRO_CANNOT);
560 }
561
562 /* Lookup inp, if any. Returns locked TCP inpcb. */
563 tp = tcp_lro_lookup(lc->ifp,
564 (le->inner.data.lro_type == LRO_TYPE_NONE) ? &le->outer : &le->inner);
565 CURVNET_RESTORE();
566 if (tp == NULL)
567 return (TCP_LRO_CANNOT);
568
569 counter_u64_add(tcp_inp_lro_locks_taken, 1);
570
571 /* Check if the inp is dead, Jim. */
572 if (tp->t_state == TCPS_TIME_WAIT) {
573 INP_WUNLOCK(tptoinpcb(tp));
574 return (TCP_LRO_CANNOT);
575 }
576 if (tp->t_lro_cpu == HPTS_CPU_NONE && lc->lro_cpu_is_set == 1)
577 tp->t_lro_cpu = lc->lro_last_cpu;
578 /* Check if the transport doesn't support the needed optimizations. */
579 if ((tp->t_flags2 & (TF2_SUPPORTS_MBUFQ | TF2_MBUF_ACKCMP)) == 0) {
580 INP_WUNLOCK(tptoinpcb(tp));
581 return (TCP_LRO_CANNOT);
582 }
583
584 if (tp->t_flags2 & TF2_MBUF_QUEUE_READY)
585 should_wake = false;
586 else
587 should_wake = true;
588 /* Check if packets should be tapped to BPF. */
589 bpf_req = bpf_peers_present(lc->ifp->if_bpf);
590 lagg_bpf_req = false;
591 lagg_ifp = NULL;
592 if (lc->ifp->if_type == IFT_IEEE8023ADLAG ||
593 lc->ifp->if_type == IFT_INFINIBANDLAG) {
594 struct lagg_port *lp = lc->ifp->if_lagg;
595 struct lagg_softc *sc = lp->lp_softc;
596
597 lagg_ifp = sc->sc_ifp;
598 if (lagg_ifp != NULL)
599 lagg_bpf_req = bpf_peers_present(lagg_ifp->if_bpf);
600 }
601
602 /* Strip and compress all the incoming packets. */
603 can_append_old_cmp = true;
604 cmp = NULL;
605 for (pp = &le->m_head; *pp != NULL; ) {
606 mv_to = NULL;
607 if (do_bpf_strip_and_compress(tp, lc, le, pp, &cmp, &mv_to,
608 &should_wake, bpf_req, lagg_bpf_req, lagg_ifp,
609 can_append_old_cmp) == false) {
610 /* Advance to next mbuf. */
611 pp = &(*pp)->m_nextpkt;
612 /*
613 * Once we have appended we can't look in the pending
614 * inbound packets for a compressed ack to append to.
615 */
616 can_append_old_cmp = false;
617 /*
618 * Once we append we also need to stop adding to any
619 * compressed ack we were remembering. A new cmp
620 * ack will be required.
621 */
622 cmp = NULL;
623 #ifdef TCP_BLACKBOX
624 tcp_lro_log(tp, lc, le, NULL, 25, 0, 0, 0, 0);
625 #endif
626 } else if (mv_to != NULL) {
627 /* We are asked to move pp up */
628 pp = &mv_to->m_nextpkt;
629 #ifdef TCP_BLACKBOX
630 tcp_lro_log(tp, lc, le, NULL, 24, 0, 0, 0, 0);
631 } else
632 tcp_lro_log(tp, lc, le, NULL, 26, 0, 0, 0, 0);
633 #else
634 }
635 #endif
636 }
637 /* Update "m_last_mbuf", if any. */
638 if (pp == &le->m_head)
639 le->m_last_mbuf = *pp;
640 else
641 le->m_last_mbuf = __containerof(pp, struct mbuf, m_nextpkt);
642
643 /* Check if any data mbufs left. */
644 if (le->m_head != NULL) {
645 counter_u64_add(tcp_inp_lro_direct_queue, 1);
646 #ifdef TCP_BLACKBOX
647 tcp_lro_log(tp, lc, le, NULL, 22, 1, tp->t_flags2, 0, 1);
648 #endif
649 tcp_queue_pkts(tp, le);
650 }
651 if (should_wake) {
652 /* Wakeup */
653 counter_u64_add(tcp_inp_lro_wokeup_queue, 1);
654 if ((*tp->t_fb->tfb_do_queued_segments)(tp, 0))
655 /* TCP cb gone and unlocked. */
656 return (0);
657 }
658 INP_WUNLOCK(tptoinpcb(tp));
659
660 return (0); /* Success. */
661 }
662
663 void
tcp_lro_hpts_init(void)664 tcp_lro_hpts_init(void)
665 {
666 tcp_lro_flush_tcphpts = _tcp_lro_flush_tcphpts;
667 }
668
669 void
tcp_lro_hpts_uninit(void)670 tcp_lro_hpts_uninit(void)
671 {
672 atomic_store_ptr(&tcp_lro_flush_tcphpts, NULL);
673 }
674