1 /*- 2 * Copyright (c) 2007, Myricom Inc. 3 * Copyright (c) 2008, Intel Corporation. 4 * Copyright (c) 2012 The FreeBSD Foundation 5 * Copyright (c) 2016 Mellanox Technologies. 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Bjoern Zeeb 9 * under sponsorship from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_inet.h" 37 #include "opt_inet6.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/socket.h> 45 46 #include <net/if.h> 47 #include <net/if_var.h> 48 #include <net/ethernet.h> 49 #include <net/vnet.h> 50 51 #include <netinet/in_systm.h> 52 #include <netinet/in.h> 53 #include <netinet/ip6.h> 54 #include <netinet/ip.h> 55 #include <netinet/ip_var.h> 56 #include <netinet/tcp.h> 57 #include <netinet/tcp_lro.h> 58 59 #include <netinet6/ip6_var.h> 60 61 #include <machine/in_cksum.h> 62 63 static MALLOC_DEFINE(M_LRO, "LRO", "LRO control structures"); 64 65 #define TCP_LRO_UPDATE_CSUM 1 66 #ifndef TCP_LRO_UPDATE_CSUM 67 #define TCP_LRO_INVALID_CSUM 0x0000 68 #endif 69 70 int 71 tcp_lro_init(struct lro_ctrl *lc) 72 { 73 return (tcp_lro_init_args(lc, NULL, TCP_LRO_ENTRIES, 0)); 74 } 75 76 int 77 tcp_lro_init_args(struct lro_ctrl *lc, struct ifnet *ifp, 78 unsigned lro_entries, unsigned lro_mbufs) 79 { 80 struct lro_entry *le; 81 size_t size; 82 unsigned i; 83 84 lc->lro_bad_csum = 0; 85 lc->lro_queued = 0; 86 lc->lro_flushed = 0; 87 lc->lro_cnt = 0; 88 lc->lro_mbuf_count = 0; 89 lc->lro_mbuf_max = lro_mbufs; 90 lc->lro_cnt = lro_entries; 91 lc->ifp = ifp; 92 SLIST_INIT(&lc->lro_free); 93 SLIST_INIT(&lc->lro_active); 94 95 /* compute size to allocate */ 96 size = (lro_mbufs * sizeof(struct mbuf *)) + 97 (lro_entries * sizeof(*le)); 98 lc->lro_mbuf_data = (struct mbuf **) 99 malloc(size, M_LRO, M_NOWAIT | M_ZERO); 100 101 /* check for out of memory */ 102 if (lc->lro_mbuf_data == NULL) { 103 memset(lc, 0, sizeof(*lc)); 104 return (ENOMEM); 105 } 106 /* compute offset for LRO entries */ 107 le = (struct lro_entry *) 108 (lc->lro_mbuf_data + lro_mbufs); 109 110 /* setup linked list */ 111 for (i = 0; i != lro_entries; i++) 112 SLIST_INSERT_HEAD(&lc->lro_free, le + i, next); 113 114 return (0); 115 } 116 117 void 118 tcp_lro_free(struct lro_ctrl *lc) 119 { 120 struct lro_entry *le; 121 unsigned x; 122 123 /* reset LRO free list */ 124 SLIST_INIT(&lc->lro_free); 125 126 /* free active mbufs, if any */ 127 while ((le = SLIST_FIRST(&lc->lro_active)) != NULL) { 128 SLIST_REMOVE_HEAD(&lc->lro_active, next); 129 m_freem(le->m_head); 130 } 131 132 /* free mbuf array, if any */ 133 for (x = 0; x != lc->lro_mbuf_count; x++) 134 m_freem(lc->lro_mbuf_data[x]); 135 lc->lro_mbuf_count = 0; 136 137 /* free allocated memory, if any */ 138 free(lc->lro_mbuf_data, M_LRO); 139 lc->lro_mbuf_data = NULL; 140 } 141 142 #ifdef TCP_LRO_UPDATE_CSUM 143 static uint16_t 144 tcp_lro_csum_th(struct tcphdr *th) 145 { 146 uint32_t ch; 147 uint16_t *p, l; 148 149 ch = th->th_sum = 0x0000; 150 l = th->th_off; 151 p = (uint16_t *)th; 152 while (l > 0) { 153 ch += *p; 154 p++; 155 ch += *p; 156 p++; 157 l--; 158 } 159 while (ch > 0xffff) 160 ch = (ch >> 16) + (ch & 0xffff); 161 162 return (ch & 0xffff); 163 } 164 165 static uint16_t 166 tcp_lro_rx_csum_fixup(struct lro_entry *le, void *l3hdr, struct tcphdr *th, 167 uint16_t tcp_data_len, uint16_t csum) 168 { 169 uint32_t c; 170 uint16_t cs; 171 172 c = csum; 173 174 /* Remove length from checksum. */ 175 switch (le->eh_type) { 176 #ifdef INET6 177 case ETHERTYPE_IPV6: 178 { 179 struct ip6_hdr *ip6; 180 181 ip6 = (struct ip6_hdr *)l3hdr; 182 if (le->append_cnt == 0) 183 cs = ip6->ip6_plen; 184 else { 185 uint32_t cx; 186 187 cx = ntohs(ip6->ip6_plen); 188 cs = in6_cksum_pseudo(ip6, cx, ip6->ip6_nxt, 0); 189 } 190 break; 191 } 192 #endif 193 #ifdef INET 194 case ETHERTYPE_IP: 195 { 196 struct ip *ip4; 197 198 ip4 = (struct ip *)l3hdr; 199 if (le->append_cnt == 0) 200 cs = ip4->ip_len; 201 else { 202 cs = in_addword(ntohs(ip4->ip_len) - sizeof(*ip4), 203 IPPROTO_TCP); 204 cs = in_pseudo(ip4->ip_src.s_addr, ip4->ip_dst.s_addr, 205 htons(cs)); 206 } 207 break; 208 } 209 #endif 210 default: 211 cs = 0; /* Keep compiler happy. */ 212 } 213 214 cs = ~cs; 215 c += cs; 216 217 /* Remove TCP header csum. */ 218 cs = ~tcp_lro_csum_th(th); 219 c += cs; 220 while (c > 0xffff) 221 c = (c >> 16) + (c & 0xffff); 222 223 return (c & 0xffff); 224 } 225 #endif 226 227 void 228 tcp_lro_flush_inactive(struct lro_ctrl *lc, const struct timeval *timeout) 229 { 230 struct lro_entry *le, *le_tmp; 231 struct timeval tv; 232 233 if (SLIST_EMPTY(&lc->lro_active)) 234 return; 235 236 getmicrotime(&tv); 237 timevalsub(&tv, timeout); 238 SLIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) { 239 if (timevalcmp(&tv, &le->mtime, >=)) { 240 SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); 241 tcp_lro_flush(lc, le); 242 } 243 } 244 } 245 246 void 247 tcp_lro_flush(struct lro_ctrl *lc, struct lro_entry *le) 248 { 249 250 if (le->append_cnt > 0) { 251 struct tcphdr *th; 252 uint16_t p_len; 253 254 p_len = htons(le->p_len); 255 switch (le->eh_type) { 256 #ifdef INET6 257 case ETHERTYPE_IPV6: 258 { 259 struct ip6_hdr *ip6; 260 261 ip6 = le->le_ip6; 262 ip6->ip6_plen = p_len; 263 th = (struct tcphdr *)(ip6 + 1); 264 le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | 265 CSUM_PSEUDO_HDR; 266 le->p_len += ETHER_HDR_LEN + sizeof(*ip6); 267 break; 268 } 269 #endif 270 #ifdef INET 271 case ETHERTYPE_IP: 272 { 273 struct ip *ip4; 274 #ifdef TCP_LRO_UPDATE_CSUM 275 uint32_t cl; 276 uint16_t c; 277 #endif 278 279 ip4 = le->le_ip4; 280 #ifdef TCP_LRO_UPDATE_CSUM 281 /* Fix IP header checksum for new length. */ 282 c = ~ip4->ip_sum; 283 cl = c; 284 c = ~ip4->ip_len; 285 cl += c + p_len; 286 while (cl > 0xffff) 287 cl = (cl >> 16) + (cl & 0xffff); 288 c = cl; 289 ip4->ip_sum = ~c; 290 #else 291 ip4->ip_sum = TCP_LRO_INVALID_CSUM; 292 #endif 293 ip4->ip_len = p_len; 294 th = (struct tcphdr *)(ip4 + 1); 295 le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | 296 CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID; 297 le->p_len += ETHER_HDR_LEN; 298 break; 299 } 300 #endif 301 default: 302 th = NULL; /* Keep compiler happy. */ 303 } 304 le->m_head->m_pkthdr.csum_data = 0xffff; 305 le->m_head->m_pkthdr.len = le->p_len; 306 307 /* Incorporate the latest ACK into the TCP header. */ 308 th->th_ack = le->ack_seq; 309 th->th_win = le->window; 310 /* Incorporate latest timestamp into the TCP header. */ 311 if (le->timestamp != 0) { 312 uint32_t *ts_ptr; 313 314 ts_ptr = (uint32_t *)(th + 1); 315 ts_ptr[1] = htonl(le->tsval); 316 ts_ptr[2] = le->tsecr; 317 } 318 #ifdef TCP_LRO_UPDATE_CSUM 319 /* Update the TCP header checksum. */ 320 le->ulp_csum += p_len; 321 le->ulp_csum += tcp_lro_csum_th(th); 322 while (le->ulp_csum > 0xffff) 323 le->ulp_csum = (le->ulp_csum >> 16) + 324 (le->ulp_csum & 0xffff); 325 th->th_sum = (le->ulp_csum & 0xffff); 326 th->th_sum = ~th->th_sum; 327 #else 328 th->th_sum = TCP_LRO_INVALID_CSUM; 329 #endif 330 } 331 332 (*lc->ifp->if_input)(lc->ifp, le->m_head); 333 lc->lro_queued += le->append_cnt + 1; 334 lc->lro_flushed++; 335 bzero(le, sizeof(*le)); 336 SLIST_INSERT_HEAD(&lc->lro_free, le, next); 337 } 338 339 static int 340 tcp_lro_mbuf_compare_header(const void *ppa, const void *ppb) 341 { 342 const struct mbuf *ma = *((const struct mbuf * const *)ppa); 343 const struct mbuf *mb = *((const struct mbuf * const *)ppb); 344 int ret; 345 346 ret = M_HASHTYPE_GET(ma) - M_HASHTYPE_GET(mb); 347 if (ret != 0) 348 goto done; 349 350 ret = ma->m_pkthdr.flowid - mb->m_pkthdr.flowid; 351 if (ret != 0) 352 goto done; 353 354 ret = TCP_LRO_SEQUENCE(ma) - TCP_LRO_SEQUENCE(mb); 355 done: 356 return (ret); 357 } 358 359 void 360 tcp_lro_flush_all(struct lro_ctrl *lc) 361 { 362 struct lro_entry *le; 363 uint32_t hashtype; 364 uint32_t flowid; 365 unsigned x; 366 367 /* check if no mbufs to flush */ 368 if (__predict_false(lc->lro_mbuf_count == 0)) 369 goto done; 370 371 /* sort all mbufs according to stream */ 372 qsort(lc->lro_mbuf_data, lc->lro_mbuf_count, sizeof(struct mbuf *), 373 &tcp_lro_mbuf_compare_header); 374 375 /* input data into LRO engine, stream by stream */ 376 flowid = 0; 377 hashtype = M_HASHTYPE_NONE; 378 for (x = 0; x != lc->lro_mbuf_count; x++) { 379 struct mbuf *mb; 380 381 mb = lc->lro_mbuf_data[x]; 382 383 /* check for new stream */ 384 if (mb->m_pkthdr.flowid != flowid || 385 M_HASHTYPE_GET(mb) != hashtype) { 386 flowid = mb->m_pkthdr.flowid; 387 hashtype = M_HASHTYPE_GET(mb); 388 389 /* flush active streams */ 390 while ((le = SLIST_FIRST(&lc->lro_active)) != NULL) { 391 SLIST_REMOVE_HEAD(&lc->lro_active, next); 392 tcp_lro_flush(lc, le); 393 } 394 } 395 #ifdef TCP_LRO_RESET_SEQUENCE 396 /* reset sequence number */ 397 TCP_LRO_SEQUENCE(mb) = 0; 398 #endif 399 /* add packet to LRO engine */ 400 if (tcp_lro_rx(lc, mb, 0) != 0) { 401 /* input packet to network layer */ 402 (*lc->ifp->if_input)(lc->ifp, mb); 403 lc->lro_queued++; 404 lc->lro_flushed++; 405 } 406 } 407 done: 408 /* flush active streams */ 409 while ((le = SLIST_FIRST(&lc->lro_active)) != NULL) { 410 SLIST_REMOVE_HEAD(&lc->lro_active, next); 411 tcp_lro_flush(lc, le); 412 } 413 lc->lro_mbuf_count = 0; 414 } 415 416 #ifdef INET6 417 static int 418 tcp_lro_rx_ipv6(struct lro_ctrl *lc, struct mbuf *m, struct ip6_hdr *ip6, 419 struct tcphdr **th) 420 { 421 422 /* XXX-BZ we should check the flow-label. */ 423 424 /* XXX-BZ We do not yet support ext. hdrs. */ 425 if (ip6->ip6_nxt != IPPROTO_TCP) 426 return (TCP_LRO_NOT_SUPPORTED); 427 428 /* Find the TCP header. */ 429 *th = (struct tcphdr *)(ip6 + 1); 430 431 return (0); 432 } 433 #endif 434 435 #ifdef INET 436 static int 437 tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4, 438 struct tcphdr **th) 439 { 440 int csum_flags; 441 uint16_t csum; 442 443 if (ip4->ip_p != IPPROTO_TCP) 444 return (TCP_LRO_NOT_SUPPORTED); 445 446 /* Ensure there are no options. */ 447 if ((ip4->ip_hl << 2) != sizeof (*ip4)) 448 return (TCP_LRO_CANNOT); 449 450 /* .. and the packet is not fragmented. */ 451 if (ip4->ip_off & htons(IP_MF|IP_OFFMASK)) 452 return (TCP_LRO_CANNOT); 453 454 /* Legacy IP has a header checksum that needs to be correct. */ 455 csum_flags = m->m_pkthdr.csum_flags; 456 if (csum_flags & CSUM_IP_CHECKED) { 457 if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) { 458 lc->lro_bad_csum++; 459 return (TCP_LRO_CANNOT); 460 } 461 } else { 462 csum = in_cksum_hdr(ip4); 463 if (__predict_false((csum) != 0)) { 464 lc->lro_bad_csum++; 465 return (TCP_LRO_CANNOT); 466 } 467 } 468 469 /* Find the TCP header (we assured there are no IP options). */ 470 *th = (struct tcphdr *)(ip4 + 1); 471 472 return (0); 473 } 474 #endif 475 476 int 477 tcp_lro_rx(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum) 478 { 479 struct lro_entry *le; 480 struct ether_header *eh; 481 #ifdef INET6 482 struct ip6_hdr *ip6 = NULL; /* Keep compiler happy. */ 483 #endif 484 #ifdef INET 485 struct ip *ip4 = NULL; /* Keep compiler happy. */ 486 #endif 487 struct tcphdr *th; 488 void *l3hdr = NULL; /* Keep compiler happy. */ 489 uint32_t *ts_ptr; 490 tcp_seq seq; 491 int error, ip_len, l; 492 uint16_t eh_type, tcp_data_len; 493 494 /* We expect a contiguous header [eh, ip, tcp]. */ 495 496 eh = mtod(m, struct ether_header *); 497 eh_type = ntohs(eh->ether_type); 498 switch (eh_type) { 499 #ifdef INET6 500 case ETHERTYPE_IPV6: 501 { 502 CURVNET_SET(lc->ifp->if_vnet); 503 if (V_ip6_forwarding != 0) { 504 /* XXX-BZ stats but changing lro_ctrl is a problem. */ 505 CURVNET_RESTORE(); 506 return (TCP_LRO_CANNOT); 507 } 508 CURVNET_RESTORE(); 509 l3hdr = ip6 = (struct ip6_hdr *)(eh + 1); 510 error = tcp_lro_rx_ipv6(lc, m, ip6, &th); 511 if (error != 0) 512 return (error); 513 tcp_data_len = ntohs(ip6->ip6_plen); 514 ip_len = sizeof(*ip6) + tcp_data_len; 515 break; 516 } 517 #endif 518 #ifdef INET 519 case ETHERTYPE_IP: 520 { 521 CURVNET_SET(lc->ifp->if_vnet); 522 if (V_ipforwarding != 0) { 523 /* XXX-BZ stats but changing lro_ctrl is a problem. */ 524 CURVNET_RESTORE(); 525 return (TCP_LRO_CANNOT); 526 } 527 CURVNET_RESTORE(); 528 l3hdr = ip4 = (struct ip *)(eh + 1); 529 error = tcp_lro_rx_ipv4(lc, m, ip4, &th); 530 if (error != 0) 531 return (error); 532 ip_len = ntohs(ip4->ip_len); 533 tcp_data_len = ip_len - sizeof(*ip4); 534 break; 535 } 536 #endif 537 /* XXX-BZ what happens in case of VLAN(s)? */ 538 default: 539 return (TCP_LRO_NOT_SUPPORTED); 540 } 541 542 /* 543 * If the frame is padded beyond the end of the IP packet, then we must 544 * trim the extra bytes off. 545 */ 546 l = m->m_pkthdr.len - (ETHER_HDR_LEN + ip_len); 547 if (l != 0) { 548 if (l < 0) 549 /* Truncated packet. */ 550 return (TCP_LRO_CANNOT); 551 552 m_adj(m, -l); 553 } 554 555 /* 556 * Check TCP header constraints. 557 */ 558 /* Ensure no bits set besides ACK or PSH. */ 559 if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0) 560 return (TCP_LRO_CANNOT); 561 562 /* XXX-BZ We lose a AKC|PUSH flag concatinating multiple segments. */ 563 /* XXX-BZ Ideally we'd flush on PUSH? */ 564 565 /* 566 * Check for timestamps. 567 * Since the only option we handle are timestamps, we only have to 568 * handle the simple case of aligned timestamps. 569 */ 570 l = (th->th_off << 2); 571 tcp_data_len -= l; 572 l -= sizeof(*th); 573 ts_ptr = (uint32_t *)(th + 1); 574 if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) || 575 (*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16| 576 TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)))) 577 return (TCP_LRO_CANNOT); 578 579 /* If the driver did not pass in the checksum, set it now. */ 580 if (csum == 0x0000) 581 csum = th->th_sum; 582 583 seq = ntohl(th->th_seq); 584 585 /* Try to find a matching previous segment. */ 586 SLIST_FOREACH(le, &lc->lro_active, next) { 587 if (le->eh_type != eh_type) 588 continue; 589 if (le->source_port != th->th_sport || 590 le->dest_port != th->th_dport) 591 continue; 592 switch (eh_type) { 593 #ifdef INET6 594 case ETHERTYPE_IPV6: 595 if (bcmp(&le->source_ip6, &ip6->ip6_src, 596 sizeof(struct in6_addr)) != 0 || 597 bcmp(&le->dest_ip6, &ip6->ip6_dst, 598 sizeof(struct in6_addr)) != 0) 599 continue; 600 break; 601 #endif 602 #ifdef INET 603 case ETHERTYPE_IP: 604 if (le->source_ip4 != ip4->ip_src.s_addr || 605 le->dest_ip4 != ip4->ip_dst.s_addr) 606 continue; 607 break; 608 #endif 609 } 610 611 /* Flush now if appending will result in overflow. */ 612 if (le->p_len > (65535 - tcp_data_len)) { 613 SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); 614 tcp_lro_flush(lc, le); 615 break; 616 } 617 618 /* Try to append the new segment. */ 619 if (__predict_false(seq != le->next_seq || 620 (tcp_data_len == 0 && le->ack_seq == th->th_ack))) { 621 /* Out of order packet or duplicate ACK. */ 622 SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); 623 tcp_lro_flush(lc, le); 624 return (TCP_LRO_CANNOT); 625 } 626 627 if (l != 0) { 628 uint32_t tsval = ntohl(*(ts_ptr + 1)); 629 /* Make sure timestamp values are increasing. */ 630 /* XXX-BZ flip and use TSTMP_GEQ macro for this? */ 631 if (__predict_false(le->tsval > tsval || 632 *(ts_ptr + 2) == 0)) 633 return (TCP_LRO_CANNOT); 634 le->tsval = tsval; 635 le->tsecr = *(ts_ptr + 2); 636 } 637 638 le->next_seq += tcp_data_len; 639 le->ack_seq = th->th_ack; 640 le->window = th->th_win; 641 le->append_cnt++; 642 643 #ifdef TCP_LRO_UPDATE_CSUM 644 le->ulp_csum += tcp_lro_rx_csum_fixup(le, l3hdr, th, 645 tcp_data_len, ~csum); 646 #endif 647 648 if (tcp_data_len == 0) { 649 m_freem(m); 650 return (0); 651 } 652 653 le->p_len += tcp_data_len; 654 655 /* 656 * Adjust the mbuf so that m_data points to the first byte of 657 * the ULP payload. Adjust the mbuf to avoid complications and 658 * append new segment to existing mbuf chain. 659 */ 660 m_adj(m, m->m_pkthdr.len - tcp_data_len); 661 m_demote_pkthdr(m); 662 663 le->m_tail->m_next = m; 664 le->m_tail = m_last(m); 665 666 /* 667 * If a possible next full length packet would cause an 668 * overflow, pro-actively flush now. 669 */ 670 if (le->p_len > (65535 - lc->ifp->if_mtu)) { 671 SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); 672 tcp_lro_flush(lc, le); 673 } else 674 getmicrotime(&le->mtime); 675 676 return (0); 677 } 678 679 /* Try to find an empty slot. */ 680 if (SLIST_EMPTY(&lc->lro_free)) 681 return (TCP_LRO_CANNOT); 682 683 /* Start a new segment chain. */ 684 le = SLIST_FIRST(&lc->lro_free); 685 SLIST_REMOVE_HEAD(&lc->lro_free, next); 686 SLIST_INSERT_HEAD(&lc->lro_active, le, next); 687 getmicrotime(&le->mtime); 688 689 /* Start filling in details. */ 690 switch (eh_type) { 691 #ifdef INET6 692 case ETHERTYPE_IPV6: 693 le->le_ip6 = ip6; 694 le->source_ip6 = ip6->ip6_src; 695 le->dest_ip6 = ip6->ip6_dst; 696 le->eh_type = eh_type; 697 le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN - sizeof(*ip6); 698 break; 699 #endif 700 #ifdef INET 701 case ETHERTYPE_IP: 702 le->le_ip4 = ip4; 703 le->source_ip4 = ip4->ip_src.s_addr; 704 le->dest_ip4 = ip4->ip_dst.s_addr; 705 le->eh_type = eh_type; 706 le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN; 707 break; 708 #endif 709 } 710 le->source_port = th->th_sport; 711 le->dest_port = th->th_dport; 712 713 le->next_seq = seq + tcp_data_len; 714 le->ack_seq = th->th_ack; 715 le->window = th->th_win; 716 if (l != 0) { 717 le->timestamp = 1; 718 le->tsval = ntohl(*(ts_ptr + 1)); 719 le->tsecr = *(ts_ptr + 2); 720 } 721 722 #ifdef TCP_LRO_UPDATE_CSUM 723 /* 724 * Do not touch the csum of the first packet. However save the 725 * "adjusted" checksum of just the source and destination addresses, 726 * the next header and the TCP payload. The length and TCP header 727 * parts may change, so we remove those from the saved checksum and 728 * re-add with final values on tcp_lro_flush() if needed. 729 */ 730 KASSERT(le->ulp_csum == 0, ("%s: le=%p le->ulp_csum=0x%04x\n", 731 __func__, le, le->ulp_csum)); 732 733 le->ulp_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len, 734 ~csum); 735 th->th_sum = csum; /* Restore checksum on first packet. */ 736 #endif 737 738 le->m_head = m; 739 le->m_tail = m_last(m); 740 741 return (0); 742 } 743 744 void 745 tcp_lro_queue_mbuf(struct lro_ctrl *lc, struct mbuf *mb) 746 { 747 /* sanity checks */ 748 if (__predict_false(lc->ifp == NULL || lc->lro_mbuf_data == NULL || 749 lc->lro_mbuf_max == 0)) { 750 /* packet drop */ 751 m_freem(mb); 752 return; 753 } 754 755 /* check if packet is not LRO capable */ 756 if (__predict_false(mb->m_pkthdr.csum_flags == 0 || 757 (lc->ifp->if_capenable & IFCAP_LRO) == 0)) { 758 lc->lro_flushed++; 759 lc->lro_queued++; 760 761 /* input packet to network layer */ 762 (*lc->ifp->if_input) (lc->ifp, mb); 763 return; 764 } 765 766 /* check if array is full */ 767 if (__predict_false(lc->lro_mbuf_count == lc->lro_mbuf_max)) 768 tcp_lro_flush_all(lc); 769 770 /* store sequence number */ 771 TCP_LRO_SEQUENCE(mb) = lc->lro_mbuf_count; 772 773 /* enter mbuf */ 774 lc->lro_mbuf_data[lc->lro_mbuf_count++] = mb; 775 } 776 777 /* end */ 778