1 /* Evaluate MSG_ZEROCOPY 2 * 3 * Send traffic between two processes over one of the supported 4 * protocols and modes: 5 * 6 * PF_INET/PF_INET6 7 * - SOCK_STREAM 8 * - SOCK_DGRAM 9 * - SOCK_DGRAM with UDP_CORK 10 * - SOCK_RAW 11 * - SOCK_RAW with IP_HDRINCL 12 * 13 * PF_PACKET 14 * - SOCK_DGRAM 15 * - SOCK_RAW 16 * 17 * PF_RDS 18 * - SOCK_SEQPACKET 19 * 20 * Start this program on two connected hosts, one in send mode and 21 * the other with option '-r' to put it in receiver mode. 22 * 23 * If zerocopy mode ('-z') is enabled, the sender will verify that 24 * the kernel queues completions on the error queue for all zerocopy 25 * transfers. 26 */ 27 28 #define _GNU_SOURCE 29 30 #include <arpa/inet.h> 31 #include <error.h> 32 #include <errno.h> 33 #include <limits.h> 34 #include <linux/errqueue.h> 35 #include <linux/if_packet.h> 36 #include <linux/ipv6.h> 37 #include <linux/socket.h> 38 #include <linux/sockios.h> 39 #include <net/ethernet.h> 40 #include <net/if.h> 41 #include <netinet/ip.h> 42 #include <netinet/ip6.h> 43 #include <netinet/tcp.h> 44 #include <netinet/udp.h> 45 #include <poll.h> 46 #include <sched.h> 47 #include <stdbool.h> 48 #include <stdio.h> 49 #include <stdint.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <sys/ioctl.h> 53 #include <sys/socket.h> 54 #include <sys/stat.h> 55 #include <sys/time.h> 56 #include <sys/types.h> 57 #include <sys/wait.h> 58 #include <unistd.h> 59 #include <linux/rds.h> 60 61 #ifndef SO_EE_ORIGIN_ZEROCOPY 62 #define SO_EE_ORIGIN_ZEROCOPY 5 63 #endif 64 65 #ifndef SO_ZEROCOPY 66 #define SO_ZEROCOPY 60 67 #endif 68 69 #ifndef SO_EE_CODE_ZEROCOPY_COPIED 70 #define SO_EE_CODE_ZEROCOPY_COPIED 1 71 #endif 72 73 #ifndef MSG_ZEROCOPY 74 #define MSG_ZEROCOPY 0x4000000 75 #endif 76 77 static int cfg_cork; 78 static bool cfg_cork_mixed; 79 static int cfg_cpu = -1; /* default: pin to last cpu */ 80 static int cfg_family = PF_UNSPEC; 81 static int cfg_ifindex = 1; 82 static int cfg_payload_len; 83 static int cfg_port = 8000; 84 static bool cfg_rx; 85 static int cfg_runtime_ms = 4200; 86 static int cfg_verbose; 87 static int cfg_waittime_ms = 500; 88 static bool cfg_zerocopy; 89 90 static socklen_t cfg_alen; 91 static struct sockaddr_storage cfg_dst_addr; 92 static struct sockaddr_storage cfg_src_addr; 93 94 static char payload[IP_MAXPACKET]; 95 static long packets, bytes, completions, expected_completions; 96 static int zerocopied = -1; 97 static uint32_t next_completion; 98 99 static unsigned long gettimeofday_ms(void) 100 { 101 struct timeval tv; 102 103 gettimeofday(&tv, NULL); 104 return (tv.tv_sec * 1000) + (tv.tv_usec / 1000); 105 } 106 107 static uint16_t get_ip_csum(const uint16_t *start, int num_words) 108 { 109 unsigned long sum = 0; 110 int i; 111 112 for (i = 0; i < num_words; i++) 113 sum += start[i]; 114 115 while (sum >> 16) 116 sum = (sum & 0xFFFF) + (sum >> 16); 117 118 return ~sum; 119 } 120 121 static int do_setcpu(int cpu) 122 { 123 cpu_set_t mask; 124 125 CPU_ZERO(&mask); 126 CPU_SET(cpu, &mask); 127 if (sched_setaffinity(0, sizeof(mask), &mask)) 128 error(1, 0, "setaffinity %d", cpu); 129 130 if (cfg_verbose) 131 fprintf(stderr, "cpu: %u\n", cpu); 132 133 return 0; 134 } 135 136 static void do_setsockopt(int fd, int level, int optname, int val) 137 { 138 if (setsockopt(fd, level, optname, &val, sizeof(val))) 139 error(1, errno, "setsockopt %d.%d: %d", level, optname, val); 140 } 141 142 static int do_poll(int fd, int events) 143 { 144 struct pollfd pfd; 145 int ret; 146 147 pfd.events = events; 148 pfd.revents = 0; 149 pfd.fd = fd; 150 151 ret = poll(&pfd, 1, cfg_waittime_ms); 152 if (ret == -1) 153 error(1, errno, "poll"); 154 155 return ret && (pfd.revents & events); 156 } 157 158 static int do_accept(int fd) 159 { 160 int fda = fd; 161 162 fd = accept(fda, NULL, NULL); 163 if (fd == -1) 164 error(1, errno, "accept"); 165 if (close(fda)) 166 error(1, errno, "close listen sock"); 167 168 return fd; 169 } 170 171 static void add_zcopy_cookie(struct msghdr *msg, uint32_t cookie) 172 { 173 struct cmsghdr *cm; 174 175 if (!msg->msg_control) 176 error(1, errno, "NULL cookie"); 177 cm = (void *)msg->msg_control; 178 cm->cmsg_len = CMSG_LEN(sizeof(cookie)); 179 cm->cmsg_level = SOL_RDS; 180 cm->cmsg_type = RDS_CMSG_ZCOPY_COOKIE; 181 memcpy(CMSG_DATA(cm), &cookie, sizeof(cookie)); 182 } 183 184 static bool do_sendmsg(int fd, struct msghdr *msg, bool do_zerocopy, int domain) 185 { 186 int ret, len, i, flags; 187 static uint32_t cookie; 188 char ckbuf[CMSG_SPACE(sizeof(cookie))]; 189 190 len = 0; 191 for (i = 0; i < msg->msg_iovlen; i++) 192 len += msg->msg_iov[i].iov_len; 193 194 flags = MSG_DONTWAIT; 195 if (do_zerocopy) { 196 flags |= MSG_ZEROCOPY; 197 if (domain == PF_RDS) { 198 memset(&msg->msg_control, 0, sizeof(msg->msg_control)); 199 msg->msg_controllen = CMSG_SPACE(sizeof(cookie)); 200 msg->msg_control = (struct cmsghdr *)ckbuf; 201 add_zcopy_cookie(msg, ++cookie); 202 } 203 } 204 205 ret = sendmsg(fd, msg, flags); 206 if (ret == -1 && errno == EAGAIN) 207 return false; 208 if (ret == -1) 209 error(1, errno, "send"); 210 if (cfg_verbose && ret != len) 211 fprintf(stderr, "send: ret=%u != %u\n", ret, len); 212 213 if (len) { 214 packets++; 215 bytes += ret; 216 if (do_zerocopy && ret) 217 expected_completions++; 218 } 219 if (do_zerocopy && domain == PF_RDS) { 220 msg->msg_control = NULL; 221 msg->msg_controllen = 0; 222 } 223 224 return true; 225 } 226 227 static void do_sendmsg_corked(int fd, struct msghdr *msg) 228 { 229 bool do_zerocopy = cfg_zerocopy; 230 int i, payload_len, extra_len; 231 232 /* split up the packet. for non-multiple, make first buffer longer */ 233 payload_len = cfg_payload_len / cfg_cork; 234 extra_len = cfg_payload_len - (cfg_cork * payload_len); 235 236 do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 1); 237 238 for (i = 0; i < cfg_cork; i++) { 239 240 /* in mixed-frags mode, alternate zerocopy and copy frags 241 * start with non-zerocopy, to ensure attach later works 242 */ 243 if (cfg_cork_mixed) 244 do_zerocopy = (i & 1); 245 246 msg->msg_iov[0].iov_len = payload_len + extra_len; 247 extra_len = 0; 248 249 do_sendmsg(fd, msg, do_zerocopy, 250 (cfg_dst_addr.ss_family == AF_INET ? 251 PF_INET : PF_INET6)); 252 } 253 254 do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 0); 255 } 256 257 static int setup_iph(struct iphdr *iph, uint16_t payload_len) 258 { 259 struct sockaddr_in *daddr = (void *) &cfg_dst_addr; 260 struct sockaddr_in *saddr = (void *) &cfg_src_addr; 261 262 memset(iph, 0, sizeof(*iph)); 263 264 iph->version = 4; 265 iph->tos = 0; 266 iph->ihl = 5; 267 iph->ttl = 2; 268 iph->saddr = saddr->sin_addr.s_addr; 269 iph->daddr = daddr->sin_addr.s_addr; 270 iph->protocol = IPPROTO_EGP; 271 iph->tot_len = htons(sizeof(*iph) + payload_len); 272 iph->check = get_ip_csum((void *) iph, iph->ihl << 1); 273 274 return sizeof(*iph); 275 } 276 277 static int setup_ip6h(struct ipv6hdr *ip6h, uint16_t payload_len) 278 { 279 struct sockaddr_in6 *daddr = (void *) &cfg_dst_addr; 280 struct sockaddr_in6 *saddr = (void *) &cfg_src_addr; 281 282 memset(ip6h, 0, sizeof(*ip6h)); 283 284 ip6h->version = 6; 285 ip6h->payload_len = htons(payload_len); 286 ip6h->nexthdr = IPPROTO_EGP; 287 ip6h->hop_limit = 2; 288 ip6h->saddr = saddr->sin6_addr; 289 ip6h->daddr = daddr->sin6_addr; 290 291 return sizeof(*ip6h); 292 } 293 294 295 static void setup_sockaddr(int domain, const char *str_addr, 296 struct sockaddr_storage *sockaddr) 297 { 298 struct sockaddr_in6 *addr6 = (void *) sockaddr; 299 struct sockaddr_in *addr4 = (void *) sockaddr; 300 301 switch (domain) { 302 case PF_INET: 303 memset(addr4, 0, sizeof(*addr4)); 304 addr4->sin_family = AF_INET; 305 addr4->sin_port = htons(cfg_port); 306 if (str_addr && 307 inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1) 308 error(1, 0, "ipv4 parse error: %s", str_addr); 309 break; 310 case PF_INET6: 311 memset(addr6, 0, sizeof(*addr6)); 312 addr6->sin6_family = AF_INET6; 313 addr6->sin6_port = htons(cfg_port); 314 if (str_addr && 315 inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1) 316 error(1, 0, "ipv6 parse error: %s", str_addr); 317 break; 318 default: 319 error(1, 0, "illegal domain"); 320 } 321 } 322 323 static int do_setup_tx(int domain, int type, int protocol) 324 { 325 int fd; 326 327 fd = socket(domain, type, protocol); 328 if (fd == -1) 329 error(1, errno, "socket t"); 330 331 do_setsockopt(fd, SOL_SOCKET, SO_SNDBUF, 1 << 21); 332 if (cfg_zerocopy) 333 do_setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, 1); 334 335 if (domain != PF_PACKET && domain != PF_RDS) 336 if (connect(fd, (void *) &cfg_dst_addr, cfg_alen)) 337 error(1, errno, "connect"); 338 339 if (domain == PF_RDS) { 340 if (bind(fd, (void *) &cfg_src_addr, cfg_alen)) 341 error(1, errno, "bind"); 342 } 343 344 return fd; 345 } 346 347 static uint32_t do_process_zerocopy_cookies(struct rds_zcopy_cookies *ck) 348 { 349 int i; 350 351 if (ck->num > RDS_MAX_ZCOOKIES) 352 error(1, 0, "Returned %d cookies, max expected %d\n", 353 ck->num, RDS_MAX_ZCOOKIES); 354 for (i = 0; i < ck->num; i++) 355 if (cfg_verbose >= 2) 356 fprintf(stderr, "%d\n", ck->cookies[i]); 357 return ck->num; 358 } 359 360 static bool do_recvmsg_completion(int fd) 361 { 362 char cmsgbuf[CMSG_SPACE(sizeof(struct rds_zcopy_cookies))]; 363 struct rds_zcopy_cookies *ck; 364 struct cmsghdr *cmsg; 365 struct msghdr msg; 366 bool ret = false; 367 368 memset(&msg, 0, sizeof(msg)); 369 msg.msg_control = cmsgbuf; 370 msg.msg_controllen = sizeof(cmsgbuf); 371 372 if (recvmsg(fd, &msg, MSG_DONTWAIT)) 373 return ret; 374 375 if (msg.msg_flags & MSG_CTRUNC) 376 error(1, errno, "recvmsg notification: truncated"); 377 378 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { 379 if (cmsg->cmsg_level == SOL_RDS && 380 cmsg->cmsg_type == RDS_CMSG_ZCOPY_COMPLETION) { 381 382 ck = (struct rds_zcopy_cookies *)CMSG_DATA(cmsg); 383 completions += do_process_zerocopy_cookies(ck); 384 ret = true; 385 break; 386 } 387 error(0, 0, "ignoring cmsg at level %d type %d\n", 388 cmsg->cmsg_level, cmsg->cmsg_type); 389 } 390 return ret; 391 } 392 393 static bool do_recv_completion(int fd, int domain) 394 { 395 struct sock_extended_err *serr; 396 struct msghdr msg = {}; 397 struct cmsghdr *cm; 398 uint32_t hi, lo, range; 399 int ret, zerocopy; 400 char control[100]; 401 402 if (domain == PF_RDS) 403 return do_recvmsg_completion(fd); 404 405 msg.msg_control = control; 406 msg.msg_controllen = sizeof(control); 407 408 ret = recvmsg(fd, &msg, MSG_ERRQUEUE); 409 if (ret == -1 && errno == EAGAIN) 410 return false; 411 if (ret == -1) 412 error(1, errno, "recvmsg notification"); 413 if (msg.msg_flags & MSG_CTRUNC) 414 error(1, errno, "recvmsg notification: truncated"); 415 416 cm = CMSG_FIRSTHDR(&msg); 417 if (!cm) 418 error(1, 0, "cmsg: no cmsg"); 419 if (!((cm->cmsg_level == SOL_IP && cm->cmsg_type == IP_RECVERR) || 420 (cm->cmsg_level == SOL_IPV6 && cm->cmsg_type == IPV6_RECVERR) || 421 (cm->cmsg_level == SOL_PACKET && cm->cmsg_type == PACKET_TX_TIMESTAMP))) 422 error(1, 0, "serr: wrong type: %d.%d", 423 cm->cmsg_level, cm->cmsg_type); 424 425 serr = (void *) CMSG_DATA(cm); 426 427 if (serr->ee_origin != SO_EE_ORIGIN_ZEROCOPY) 428 error(1, 0, "serr: wrong origin: %u", serr->ee_origin); 429 if (serr->ee_errno != 0) 430 error(1, 0, "serr: wrong error code: %u", serr->ee_errno); 431 432 hi = serr->ee_data; 433 lo = serr->ee_info; 434 range = hi - lo + 1; 435 436 /* Detect notification gaps. These should not happen often, if at all. 437 * Gaps can occur due to drops, reordering and retransmissions. 438 */ 439 if (lo != next_completion) 440 fprintf(stderr, "gap: %u..%u does not append to %u\n", 441 lo, hi, next_completion); 442 next_completion = hi + 1; 443 444 zerocopy = !(serr->ee_code & SO_EE_CODE_ZEROCOPY_COPIED); 445 if (zerocopied == -1) 446 zerocopied = zerocopy; 447 else if (zerocopied != zerocopy) { 448 fprintf(stderr, "serr: inconsistent\n"); 449 zerocopied = zerocopy; 450 } 451 452 if (cfg_verbose >= 2) 453 fprintf(stderr, "completed: %u (h=%u l=%u)\n", 454 range, hi, lo); 455 456 completions += range; 457 return true; 458 } 459 460 /* Read all outstanding messages on the errqueue */ 461 static void do_recv_completions(int fd, int domain) 462 { 463 while (do_recv_completion(fd, domain)) {} 464 } 465 466 /* Wait for all remaining completions on the errqueue */ 467 static void do_recv_remaining_completions(int fd, int domain) 468 { 469 int64_t tstop = gettimeofday_ms() + cfg_waittime_ms; 470 471 while (completions < expected_completions && 472 gettimeofday_ms() < tstop) { 473 if (do_poll(fd, domain == PF_RDS ? POLLIN : POLLERR)) 474 do_recv_completions(fd, domain); 475 } 476 477 if (completions < expected_completions) 478 fprintf(stderr, "missing notifications: %lu < %lu\n", 479 completions, expected_completions); 480 } 481 482 static void do_tx(int domain, int type, int protocol) 483 { 484 struct iovec iov[3] = { {0} }; 485 struct sockaddr_ll laddr; 486 struct msghdr msg = {0}; 487 struct ethhdr eth; 488 union { 489 struct ipv6hdr ip6h; 490 struct iphdr iph; 491 } nh; 492 uint64_t tstop; 493 int fd; 494 495 fd = do_setup_tx(domain, type, protocol); 496 497 if (domain == PF_PACKET) { 498 uint16_t proto = cfg_family == PF_INET ? ETH_P_IP : ETH_P_IPV6; 499 500 /* sock_raw passes ll header as data */ 501 if (type == SOCK_RAW) { 502 memset(eth.h_dest, 0x06, ETH_ALEN); 503 memset(eth.h_source, 0x02, ETH_ALEN); 504 eth.h_proto = htons(proto); 505 iov[0].iov_base = ð 506 iov[0].iov_len = sizeof(eth); 507 msg.msg_iovlen++; 508 } 509 510 /* both sock_raw and sock_dgram expect name */ 511 memset(&laddr, 0, sizeof(laddr)); 512 laddr.sll_family = AF_PACKET; 513 laddr.sll_ifindex = cfg_ifindex; 514 laddr.sll_protocol = htons(proto); 515 laddr.sll_halen = ETH_ALEN; 516 517 memset(laddr.sll_addr, 0x06, ETH_ALEN); 518 519 msg.msg_name = &laddr; 520 msg.msg_namelen = sizeof(laddr); 521 } 522 523 /* packet and raw sockets with hdrincl must pass network header */ 524 if (domain == PF_PACKET || protocol == IPPROTO_RAW) { 525 if (cfg_family == PF_INET) 526 iov[1].iov_len = setup_iph(&nh.iph, cfg_payload_len); 527 else 528 iov[1].iov_len = setup_ip6h(&nh.ip6h, cfg_payload_len); 529 530 iov[1].iov_base = (void *) &nh; 531 msg.msg_iovlen++; 532 } 533 534 if (domain == PF_RDS) { 535 msg.msg_name = &cfg_dst_addr; 536 msg.msg_namelen = (cfg_dst_addr.ss_family == AF_INET ? 537 sizeof(struct sockaddr_in) : 538 sizeof(struct sockaddr_in6)); 539 } 540 541 iov[2].iov_base = payload; 542 iov[2].iov_len = cfg_payload_len; 543 msg.msg_iovlen++; 544 msg.msg_iov = &iov[3 - msg.msg_iovlen]; 545 546 tstop = gettimeofday_ms() + cfg_runtime_ms; 547 do { 548 if (cfg_cork) 549 do_sendmsg_corked(fd, &msg); 550 else 551 do_sendmsg(fd, &msg, cfg_zerocopy, domain); 552 553 while (!do_poll(fd, POLLOUT)) { 554 if (cfg_zerocopy) 555 do_recv_completions(fd, domain); 556 } 557 558 } while (gettimeofday_ms() < tstop); 559 560 if (cfg_zerocopy) 561 do_recv_remaining_completions(fd, domain); 562 563 if (close(fd)) 564 error(1, errno, "close"); 565 566 fprintf(stderr, "tx=%lu (%lu MB) txc=%lu zc=%c\n", 567 packets, bytes >> 20, completions, 568 zerocopied == 1 ? 'y' : 'n'); 569 } 570 571 static int do_setup_rx(int domain, int type, int protocol) 572 { 573 int fd; 574 575 /* If tx over PF_PACKET, rx over PF_INET(6)/SOCK_RAW, 576 * to recv the only copy of the packet, not a clone 577 */ 578 if (domain == PF_PACKET) 579 error(1, 0, "Use PF_INET/SOCK_RAW to read"); 580 581 if (type == SOCK_RAW && protocol == IPPROTO_RAW) 582 error(1, 0, "IPPROTO_RAW: not supported on Rx"); 583 584 fd = socket(domain, type, protocol); 585 if (fd == -1) 586 error(1, errno, "socket r"); 587 588 do_setsockopt(fd, SOL_SOCKET, SO_RCVBUF, 1 << 21); 589 do_setsockopt(fd, SOL_SOCKET, SO_RCVLOWAT, 1 << 16); 590 do_setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, 1); 591 592 if (bind(fd, (void *) &cfg_dst_addr, cfg_alen)) 593 error(1, errno, "bind"); 594 595 if (type == SOCK_STREAM) { 596 if (listen(fd, 1)) 597 error(1, errno, "listen"); 598 fd = do_accept(fd); 599 } 600 601 return fd; 602 } 603 604 /* Flush all outstanding bytes for the tcp receive queue */ 605 static void do_flush_tcp(int fd) 606 { 607 int ret; 608 609 /* MSG_TRUNC flushes up to len bytes */ 610 ret = recv(fd, NULL, 1 << 21, MSG_TRUNC | MSG_DONTWAIT); 611 if (ret == -1 && errno == EAGAIN) 612 return; 613 if (ret == -1) 614 error(1, errno, "flush"); 615 if (!ret) 616 return; 617 618 packets++; 619 bytes += ret; 620 } 621 622 /* Flush all outstanding datagrams. Verify first few bytes of each. */ 623 static void do_flush_datagram(int fd, int type) 624 { 625 int ret, off = 0; 626 char buf[64]; 627 628 /* MSG_TRUNC will return full datagram length */ 629 ret = recv(fd, buf, sizeof(buf), MSG_DONTWAIT | MSG_TRUNC); 630 if (ret == -1 && errno == EAGAIN) 631 return; 632 633 /* raw ipv4 return with header, raw ipv6 without */ 634 if (cfg_family == PF_INET && type == SOCK_RAW) { 635 off += sizeof(struct iphdr); 636 ret -= sizeof(struct iphdr); 637 } 638 639 if (ret == -1) 640 error(1, errno, "recv"); 641 if (ret != cfg_payload_len) 642 error(1, 0, "recv: ret=%u != %u", ret, cfg_payload_len); 643 if (ret > sizeof(buf) - off) 644 ret = sizeof(buf) - off; 645 if (memcmp(buf + off, payload, ret)) 646 error(1, 0, "recv: data mismatch"); 647 648 packets++; 649 bytes += cfg_payload_len; 650 } 651 652 static void do_rx(int domain, int type, int protocol) 653 { 654 const int cfg_receiver_wait_ms = 400; 655 uint64_t tstop; 656 int fd; 657 658 fd = do_setup_rx(domain, type, protocol); 659 660 tstop = gettimeofday_ms() + cfg_runtime_ms + cfg_receiver_wait_ms; 661 do { 662 if (type == SOCK_STREAM) 663 do_flush_tcp(fd); 664 else 665 do_flush_datagram(fd, type); 666 667 do_poll(fd, POLLIN); 668 669 } while (gettimeofday_ms() < tstop); 670 671 if (close(fd)) 672 error(1, errno, "close"); 673 674 fprintf(stderr, "rx=%lu (%lu MB)\n", packets, bytes >> 20); 675 } 676 677 static void do_test(int domain, int type, int protocol) 678 { 679 int i; 680 681 if (cfg_cork && (domain == PF_PACKET || type != SOCK_DGRAM)) 682 error(1, 0, "can only cork udp sockets"); 683 684 do_setcpu(cfg_cpu); 685 686 for (i = 0; i < IP_MAXPACKET; i++) 687 payload[i] = 'a' + (i % 26); 688 689 if (cfg_rx) 690 do_rx(domain, type, protocol); 691 else 692 do_tx(domain, type, protocol); 693 } 694 695 static void usage(const char *filepath) 696 { 697 error(1, 0, "Usage: %s [options] <test>", filepath); 698 } 699 700 static void parse_opts(int argc, char **argv) 701 { 702 const int max_payload_len = sizeof(payload) - 703 sizeof(struct ipv6hdr) - 704 sizeof(struct tcphdr) - 705 40 /* max tcp options */; 706 int c; 707 char *daddr = NULL, *saddr = NULL; 708 char *cfg_test; 709 710 cfg_payload_len = max_payload_len; 711 712 while ((c = getopt(argc, argv, "46c:C:D:i:mp:rs:S:t:vz")) != -1) { 713 switch (c) { 714 case '4': 715 if (cfg_family != PF_UNSPEC) 716 error(1, 0, "Pass one of -4 or -6"); 717 cfg_family = PF_INET; 718 cfg_alen = sizeof(struct sockaddr_in); 719 break; 720 case '6': 721 if (cfg_family != PF_UNSPEC) 722 error(1, 0, "Pass one of -4 or -6"); 723 cfg_family = PF_INET6; 724 cfg_alen = sizeof(struct sockaddr_in6); 725 break; 726 case 'c': 727 cfg_cork = strtol(optarg, NULL, 0); 728 break; 729 case 'C': 730 cfg_cpu = strtol(optarg, NULL, 0); 731 break; 732 case 'D': 733 daddr = optarg; 734 break; 735 case 'i': 736 cfg_ifindex = if_nametoindex(optarg); 737 if (cfg_ifindex == 0) 738 error(1, errno, "invalid iface: %s", optarg); 739 break; 740 case 'm': 741 cfg_cork_mixed = true; 742 break; 743 case 'p': 744 cfg_port = strtoul(optarg, NULL, 0); 745 break; 746 case 'r': 747 cfg_rx = true; 748 break; 749 case 's': 750 cfg_payload_len = strtoul(optarg, NULL, 0); 751 break; 752 case 'S': 753 saddr = optarg; 754 break; 755 case 't': 756 cfg_runtime_ms = 200 + strtoul(optarg, NULL, 10) * 1000; 757 break; 758 case 'v': 759 cfg_verbose++; 760 break; 761 case 'z': 762 cfg_zerocopy = true; 763 break; 764 } 765 } 766 767 cfg_test = argv[argc - 1]; 768 if (strcmp(cfg_test, "rds") == 0) { 769 if (!daddr) 770 error(1, 0, "-D <server addr> required for PF_RDS\n"); 771 if (!cfg_rx && !saddr) 772 error(1, 0, "-S <client addr> required for PF_RDS\n"); 773 } 774 setup_sockaddr(cfg_family, daddr, &cfg_dst_addr); 775 setup_sockaddr(cfg_family, saddr, &cfg_src_addr); 776 777 if (cfg_payload_len > max_payload_len) 778 error(1, 0, "-s: payload exceeds max (%d)", max_payload_len); 779 if (cfg_cork_mixed && (!cfg_zerocopy || !cfg_cork)) 780 error(1, 0, "-m: cork_mixed requires corking and zerocopy"); 781 782 if (optind != argc - 1) 783 usage(argv[0]); 784 } 785 786 int main(int argc, char **argv) 787 { 788 const char *cfg_test; 789 790 parse_opts(argc, argv); 791 792 cfg_test = argv[argc - 1]; 793 794 if (!strcmp(cfg_test, "packet")) 795 do_test(PF_PACKET, SOCK_RAW, 0); 796 else if (!strcmp(cfg_test, "packet_dgram")) 797 do_test(PF_PACKET, SOCK_DGRAM, 0); 798 else if (!strcmp(cfg_test, "raw")) 799 do_test(cfg_family, SOCK_RAW, IPPROTO_EGP); 800 else if (!strcmp(cfg_test, "raw_hdrincl")) 801 do_test(cfg_family, SOCK_RAW, IPPROTO_RAW); 802 else if (!strcmp(cfg_test, "tcp")) 803 do_test(cfg_family, SOCK_STREAM, 0); 804 else if (!strcmp(cfg_test, "udp")) 805 do_test(cfg_family, SOCK_DGRAM, 0); 806 else if (!strcmp(cfg_test, "rds")) 807 do_test(PF_RDS, SOCK_SEQPACKET, 0); 808 else 809 error(1, 0, "unknown cfg_test %s", cfg_test); 810 811 return 0; 812 } 813