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 int cfg_notification_limit = 32; 89 static bool cfg_zerocopy; 90 91 static socklen_t cfg_alen; 92 static struct sockaddr_storage cfg_dst_addr; 93 static struct sockaddr_storage cfg_src_addr; 94 95 static char payload[IP_MAXPACKET]; 96 static long packets, bytes, completions, expected_completions; 97 static int zerocopied = -1; 98 static uint32_t next_completion; 99 static uint32_t sends_since_notify; 100 101 static unsigned long gettimeofday_ms(void) 102 { 103 struct timeval tv; 104 105 gettimeofday(&tv, NULL); 106 return (tv.tv_sec * 1000) + (tv.tv_usec / 1000); 107 } 108 109 static uint16_t get_ip_csum(const uint16_t *start, int num_words) 110 { 111 unsigned long sum = 0; 112 int i; 113 114 for (i = 0; i < num_words; i++) 115 sum += start[i]; 116 117 while (sum >> 16) 118 sum = (sum & 0xFFFF) + (sum >> 16); 119 120 return ~sum; 121 } 122 123 static int do_setcpu(int cpu) 124 { 125 cpu_set_t mask; 126 127 CPU_ZERO(&mask); 128 CPU_SET(cpu, &mask); 129 if (sched_setaffinity(0, sizeof(mask), &mask)) 130 fprintf(stderr, "cpu: unable to pin, may increase variance.\n"); 131 else if (cfg_verbose) 132 fprintf(stderr, "cpu: %u\n", cpu); 133 134 return 0; 135 } 136 137 static void do_setsockopt(int fd, int level, int optname, int val) 138 { 139 if (setsockopt(fd, level, optname, &val, sizeof(val))) 140 error(1, errno, "setsockopt %d.%d: %d", level, optname, val); 141 } 142 143 static int do_poll(int fd, int events) 144 { 145 struct pollfd pfd; 146 int ret; 147 148 pfd.events = events; 149 pfd.revents = 0; 150 pfd.fd = fd; 151 152 ret = poll(&pfd, 1, cfg_waittime_ms); 153 if (ret == -1) 154 error(1, errno, "poll"); 155 156 return ret && (pfd.revents & events); 157 } 158 159 static int do_accept(int fd) 160 { 161 int fda = fd; 162 163 fd = accept(fda, NULL, NULL); 164 if (fd == -1) 165 error(1, errno, "accept"); 166 if (close(fda)) 167 error(1, errno, "close listen sock"); 168 169 return fd; 170 } 171 172 static void add_zcopy_cookie(struct msghdr *msg, uint32_t cookie) 173 { 174 struct cmsghdr *cm; 175 176 if (!msg->msg_control) 177 error(1, errno, "NULL cookie"); 178 cm = (void *)msg->msg_control; 179 cm->cmsg_len = CMSG_LEN(sizeof(cookie)); 180 cm->cmsg_level = SOL_RDS; 181 cm->cmsg_type = RDS_CMSG_ZCOPY_COOKIE; 182 memcpy(CMSG_DATA(cm), &cookie, sizeof(cookie)); 183 } 184 185 static bool do_sendmsg(int fd, struct msghdr *msg, bool do_zerocopy, int domain) 186 { 187 int ret, len, i, flags; 188 static uint32_t cookie; 189 char ckbuf[CMSG_SPACE(sizeof(cookie))]; 190 191 len = 0; 192 for (i = 0; i < msg->msg_iovlen; i++) 193 len += msg->msg_iov[i].iov_len; 194 195 flags = MSG_DONTWAIT; 196 if (do_zerocopy) { 197 flags |= MSG_ZEROCOPY; 198 if (domain == PF_RDS) { 199 memset(&msg->msg_control, 0, sizeof(msg->msg_control)); 200 msg->msg_controllen = CMSG_SPACE(sizeof(cookie)); 201 msg->msg_control = (struct cmsghdr *)ckbuf; 202 add_zcopy_cookie(msg, ++cookie); 203 } 204 } 205 206 ret = sendmsg(fd, msg, flags); 207 if (ret == -1 && errno == EAGAIN) 208 return false; 209 if (ret == -1) 210 error(1, errno, "send"); 211 if (cfg_verbose && ret != len) 212 fprintf(stderr, "send: ret=%u != %u\n", ret, len); 213 sends_since_notify++; 214 215 if (len) { 216 packets++; 217 bytes += ret; 218 if (do_zerocopy && ret) 219 expected_completions++; 220 } 221 if (do_zerocopy && domain == PF_RDS) { 222 msg->msg_control = NULL; 223 msg->msg_controllen = 0; 224 } 225 226 return true; 227 } 228 229 static void do_sendmsg_corked(int fd, struct msghdr *msg) 230 { 231 bool do_zerocopy = cfg_zerocopy; 232 int i, payload_len, extra_len; 233 234 /* split up the packet. for non-multiple, make first buffer longer */ 235 payload_len = cfg_payload_len / cfg_cork; 236 extra_len = cfg_payload_len - (cfg_cork * payload_len); 237 238 do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 1); 239 240 for (i = 0; i < cfg_cork; i++) { 241 242 /* in mixed-frags mode, alternate zerocopy and copy frags 243 * start with non-zerocopy, to ensure attach later works 244 */ 245 if (cfg_cork_mixed) 246 do_zerocopy = (i & 1); 247 248 msg->msg_iov[0].iov_len = payload_len + extra_len; 249 extra_len = 0; 250 251 do_sendmsg(fd, msg, do_zerocopy, 252 (cfg_dst_addr.ss_family == AF_INET ? 253 PF_INET : PF_INET6)); 254 } 255 256 do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 0); 257 } 258 259 static int setup_iph(struct iphdr *iph, uint16_t payload_len) 260 { 261 struct sockaddr_in *daddr = (void *) &cfg_dst_addr; 262 struct sockaddr_in *saddr = (void *) &cfg_src_addr; 263 264 memset(iph, 0, sizeof(*iph)); 265 266 iph->version = 4; 267 iph->tos = 0; 268 iph->ihl = 5; 269 iph->ttl = 2; 270 iph->saddr = saddr->sin_addr.s_addr; 271 iph->daddr = daddr->sin_addr.s_addr; 272 iph->protocol = IPPROTO_EGP; 273 iph->tot_len = htons(sizeof(*iph) + payload_len); 274 iph->check = get_ip_csum((void *) iph, iph->ihl << 1); 275 276 return sizeof(*iph); 277 } 278 279 static int setup_ip6h(struct ipv6hdr *ip6h, uint16_t payload_len) 280 { 281 struct sockaddr_in6 *daddr = (void *) &cfg_dst_addr; 282 struct sockaddr_in6 *saddr = (void *) &cfg_src_addr; 283 284 memset(ip6h, 0, sizeof(*ip6h)); 285 286 ip6h->version = 6; 287 ip6h->payload_len = htons(payload_len); 288 ip6h->nexthdr = IPPROTO_EGP; 289 ip6h->hop_limit = 2; 290 ip6h->saddr = saddr->sin6_addr; 291 ip6h->daddr = daddr->sin6_addr; 292 293 return sizeof(*ip6h); 294 } 295 296 297 static void setup_sockaddr(int domain, const char *str_addr, 298 struct sockaddr_storage *sockaddr) 299 { 300 struct sockaddr_in6 *addr6 = (void *) sockaddr; 301 struct sockaddr_in *addr4 = (void *) sockaddr; 302 303 switch (domain) { 304 case PF_INET: 305 memset(addr4, 0, sizeof(*addr4)); 306 addr4->sin_family = AF_INET; 307 addr4->sin_port = htons(cfg_port); 308 if (str_addr && 309 inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1) 310 error(1, 0, "ipv4 parse error: %s", str_addr); 311 break; 312 case PF_INET6: 313 memset(addr6, 0, sizeof(*addr6)); 314 addr6->sin6_family = AF_INET6; 315 addr6->sin6_port = htons(cfg_port); 316 if (str_addr && 317 inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1) 318 error(1, 0, "ipv6 parse error: %s", str_addr); 319 break; 320 default: 321 error(1, 0, "illegal domain"); 322 } 323 } 324 325 static int do_setup_tx(int domain, int type, int protocol) 326 { 327 int fd; 328 329 fd = socket(domain, type, protocol); 330 if (fd == -1) 331 error(1, errno, "socket t"); 332 333 do_setsockopt(fd, SOL_SOCKET, SO_SNDBUF, 1 << 21); 334 if (cfg_zerocopy) 335 do_setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, 1); 336 337 if (domain != PF_PACKET && domain != PF_RDS) 338 if (connect(fd, (void *) &cfg_dst_addr, cfg_alen)) 339 error(1, errno, "connect"); 340 341 if (domain == PF_RDS) { 342 if (bind(fd, (void *) &cfg_src_addr, cfg_alen)) 343 error(1, errno, "bind"); 344 } 345 346 return fd; 347 } 348 349 static uint32_t do_process_zerocopy_cookies(struct rds_zcopy_cookies *ck) 350 { 351 int i; 352 353 if (ck->num > RDS_MAX_ZCOOKIES) 354 error(1, 0, "Returned %d cookies, max expected %d\n", 355 ck->num, RDS_MAX_ZCOOKIES); 356 for (i = 0; i < ck->num; i++) 357 if (cfg_verbose >= 2) 358 fprintf(stderr, "%d\n", ck->cookies[i]); 359 return ck->num; 360 } 361 362 static bool do_recvmsg_completion(int fd) 363 { 364 char cmsgbuf[CMSG_SPACE(sizeof(struct rds_zcopy_cookies))]; 365 struct rds_zcopy_cookies *ck; 366 struct cmsghdr *cmsg; 367 struct msghdr msg; 368 bool ret = false; 369 370 memset(&msg, 0, sizeof(msg)); 371 msg.msg_control = cmsgbuf; 372 msg.msg_controllen = sizeof(cmsgbuf); 373 374 if (recvmsg(fd, &msg, MSG_DONTWAIT)) 375 return ret; 376 377 if (msg.msg_flags & MSG_CTRUNC) 378 error(1, errno, "recvmsg notification: truncated"); 379 380 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { 381 if (cmsg->cmsg_level == SOL_RDS && 382 cmsg->cmsg_type == RDS_CMSG_ZCOPY_COMPLETION) { 383 384 ck = (struct rds_zcopy_cookies *)CMSG_DATA(cmsg); 385 completions += do_process_zerocopy_cookies(ck); 386 ret = true; 387 break; 388 } 389 error(0, 0, "ignoring cmsg at level %d type %d\n", 390 cmsg->cmsg_level, cmsg->cmsg_type); 391 } 392 return ret; 393 } 394 395 static bool do_recv_completion(int fd, int domain) 396 { 397 struct sock_extended_err *serr; 398 struct msghdr msg = {}; 399 struct cmsghdr *cm; 400 uint32_t hi, lo, range; 401 int ret, zerocopy; 402 char control[100]; 403 404 if (domain == PF_RDS) 405 return do_recvmsg_completion(fd); 406 407 msg.msg_control = control; 408 msg.msg_controllen = sizeof(control); 409 410 ret = recvmsg(fd, &msg, MSG_ERRQUEUE); 411 if (ret == -1 && errno == EAGAIN) 412 return false; 413 if (ret == -1) 414 error(1, errno, "recvmsg notification"); 415 if (msg.msg_flags & MSG_CTRUNC) 416 error(1, errno, "recvmsg notification: truncated"); 417 418 cm = CMSG_FIRSTHDR(&msg); 419 if (!cm) 420 error(1, 0, "cmsg: no cmsg"); 421 if (!((cm->cmsg_level == SOL_IP && cm->cmsg_type == IP_RECVERR) || 422 (cm->cmsg_level == SOL_IPV6 && cm->cmsg_type == IPV6_RECVERR) || 423 (cm->cmsg_level == SOL_PACKET && cm->cmsg_type == PACKET_TX_TIMESTAMP))) 424 error(1, 0, "serr: wrong type: %d.%d", 425 cm->cmsg_level, cm->cmsg_type); 426 427 serr = (void *) CMSG_DATA(cm); 428 429 if (serr->ee_origin != SO_EE_ORIGIN_ZEROCOPY) 430 error(1, 0, "serr: wrong origin: %u", serr->ee_origin); 431 if (serr->ee_errno != 0) 432 error(1, 0, "serr: wrong error code: %u", serr->ee_errno); 433 434 hi = serr->ee_data; 435 lo = serr->ee_info; 436 range = hi - lo + 1; 437 438 /* Detect notification gaps. These should not happen often, if at all. 439 * Gaps can occur due to drops, reordering and retransmissions. 440 */ 441 if (cfg_verbose && lo != next_completion) 442 fprintf(stderr, "gap: %u..%u does not append to %u\n", 443 lo, hi, next_completion); 444 next_completion = hi + 1; 445 446 zerocopy = !(serr->ee_code & SO_EE_CODE_ZEROCOPY_COPIED); 447 if (zerocopied == -1) 448 zerocopied = zerocopy; 449 else if (zerocopied != zerocopy) { 450 fprintf(stderr, "serr: inconsistent\n"); 451 zerocopied = zerocopy; 452 } 453 454 if (cfg_verbose >= 2) 455 fprintf(stderr, "completed: %u (h=%u l=%u)\n", 456 range, hi, lo); 457 458 completions += range; 459 return true; 460 } 461 462 /* Read all outstanding messages on the errqueue */ 463 static void do_recv_completions(int fd, int domain) 464 { 465 while (do_recv_completion(fd, domain)) {} 466 sends_since_notify = 0; 467 } 468 469 /* Wait for all remaining completions on the errqueue */ 470 static void do_recv_remaining_completions(int fd, int domain) 471 { 472 int64_t tstop = gettimeofday_ms() + cfg_waittime_ms; 473 474 while (completions < expected_completions && 475 gettimeofday_ms() < tstop) { 476 if (do_poll(fd, domain == PF_RDS ? POLLIN : POLLERR)) 477 do_recv_completions(fd, domain); 478 } 479 480 if (completions < expected_completions) 481 fprintf(stderr, "missing notifications: %lu < %lu\n", 482 completions, expected_completions); 483 } 484 485 static void do_tx(int domain, int type, int protocol) 486 { 487 struct iovec iov[3] = { {0} }; 488 struct sockaddr_ll laddr; 489 struct msghdr msg = {0}; 490 struct ethhdr eth; 491 union { 492 struct ipv6hdr ip6h; 493 struct iphdr iph; 494 } nh; 495 uint64_t tstop; 496 int fd; 497 498 fd = do_setup_tx(domain, type, protocol); 499 500 if (domain == PF_PACKET) { 501 uint16_t proto = cfg_family == PF_INET ? ETH_P_IP : ETH_P_IPV6; 502 503 /* sock_raw passes ll header as data */ 504 if (type == SOCK_RAW) { 505 memset(eth.h_dest, 0x06, ETH_ALEN); 506 memset(eth.h_source, 0x02, ETH_ALEN); 507 eth.h_proto = htons(proto); 508 iov[0].iov_base = ð 509 iov[0].iov_len = sizeof(eth); 510 msg.msg_iovlen++; 511 } 512 513 /* both sock_raw and sock_dgram expect name */ 514 memset(&laddr, 0, sizeof(laddr)); 515 laddr.sll_family = AF_PACKET; 516 laddr.sll_ifindex = cfg_ifindex; 517 laddr.sll_protocol = htons(proto); 518 laddr.sll_halen = ETH_ALEN; 519 520 memset(laddr.sll_addr, 0x06, ETH_ALEN); 521 522 msg.msg_name = &laddr; 523 msg.msg_namelen = sizeof(laddr); 524 } 525 526 /* packet and raw sockets with hdrincl must pass network header */ 527 if (domain == PF_PACKET || protocol == IPPROTO_RAW) { 528 if (cfg_family == PF_INET) 529 iov[1].iov_len = setup_iph(&nh.iph, cfg_payload_len); 530 else 531 iov[1].iov_len = setup_ip6h(&nh.ip6h, cfg_payload_len); 532 533 iov[1].iov_base = (void *) &nh; 534 msg.msg_iovlen++; 535 } 536 537 if (domain == PF_RDS) { 538 msg.msg_name = &cfg_dst_addr; 539 msg.msg_namelen = (cfg_dst_addr.ss_family == AF_INET ? 540 sizeof(struct sockaddr_in) : 541 sizeof(struct sockaddr_in6)); 542 } 543 544 iov[2].iov_base = payload; 545 iov[2].iov_len = cfg_payload_len; 546 msg.msg_iovlen++; 547 msg.msg_iov = &iov[3 - msg.msg_iovlen]; 548 549 tstop = gettimeofday_ms() + cfg_runtime_ms; 550 do { 551 if (cfg_cork) 552 do_sendmsg_corked(fd, &msg); 553 else 554 do_sendmsg(fd, &msg, cfg_zerocopy, domain); 555 556 if (cfg_zerocopy && sends_since_notify >= cfg_notification_limit) 557 do_recv_completions(fd, domain); 558 559 while (!do_poll(fd, POLLOUT)) { 560 if (cfg_zerocopy) 561 do_recv_completions(fd, domain); 562 } 563 564 } while (gettimeofday_ms() < tstop); 565 566 if (cfg_zerocopy) 567 do_recv_remaining_completions(fd, domain); 568 569 if (close(fd)) 570 error(1, errno, "close"); 571 572 fprintf(stderr, "tx=%lu (%lu MB) txc=%lu zc=%c\n", 573 packets, bytes >> 20, completions, 574 zerocopied == 1 ? 'y' : 'n'); 575 } 576 577 static int do_setup_rx(int domain, int type, int protocol) 578 { 579 int fd; 580 581 /* If tx over PF_PACKET, rx over PF_INET(6)/SOCK_RAW, 582 * to recv the only copy of the packet, not a clone 583 */ 584 if (domain == PF_PACKET) 585 error(1, 0, "Use PF_INET/SOCK_RAW to read"); 586 587 if (type == SOCK_RAW && protocol == IPPROTO_RAW) 588 error(1, 0, "IPPROTO_RAW: not supported on Rx"); 589 590 fd = socket(domain, type, protocol); 591 if (fd == -1) 592 error(1, errno, "socket r"); 593 594 do_setsockopt(fd, SOL_SOCKET, SO_RCVBUF, 1 << 21); 595 do_setsockopt(fd, SOL_SOCKET, SO_RCVLOWAT, 1 << 16); 596 do_setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, 1); 597 598 if (bind(fd, (void *) &cfg_dst_addr, cfg_alen)) 599 error(1, errno, "bind"); 600 601 if (type == SOCK_STREAM) { 602 if (listen(fd, 1)) 603 error(1, errno, "listen"); 604 fd = do_accept(fd); 605 } 606 607 return fd; 608 } 609 610 /* Flush all outstanding bytes for the tcp receive queue */ 611 static void do_flush_tcp(int fd) 612 { 613 int ret; 614 615 /* MSG_TRUNC flushes up to len bytes */ 616 ret = recv(fd, NULL, 1 << 21, MSG_TRUNC | MSG_DONTWAIT); 617 if (ret == -1 && errno == EAGAIN) 618 return; 619 if (ret == -1) 620 error(1, errno, "flush"); 621 if (!ret) 622 return; 623 624 packets++; 625 bytes += ret; 626 } 627 628 /* Flush all outstanding datagrams. Verify first few bytes of each. */ 629 static void do_flush_datagram(int fd, int type) 630 { 631 int ret, off = 0; 632 char buf[64]; 633 634 /* MSG_TRUNC will return full datagram length */ 635 ret = recv(fd, buf, sizeof(buf), MSG_DONTWAIT | MSG_TRUNC); 636 if (ret == -1 && errno == EAGAIN) 637 return; 638 639 /* raw ipv4 return with header, raw ipv6 without */ 640 if (cfg_family == PF_INET && type == SOCK_RAW) { 641 off += sizeof(struct iphdr); 642 ret -= sizeof(struct iphdr); 643 } 644 645 if (ret == -1) 646 error(1, errno, "recv"); 647 if (ret != cfg_payload_len) 648 error(1, 0, "recv: ret=%u != %u", ret, cfg_payload_len); 649 if (ret > sizeof(buf) - off) 650 ret = sizeof(buf) - off; 651 if (memcmp(buf + off, payload, ret)) 652 error(1, 0, "recv: data mismatch"); 653 654 packets++; 655 bytes += cfg_payload_len; 656 } 657 658 static void do_rx(int domain, int type, int protocol) 659 { 660 const int cfg_receiver_wait_ms = 400; 661 uint64_t tstop; 662 int fd; 663 664 fd = do_setup_rx(domain, type, protocol); 665 666 tstop = gettimeofday_ms() + cfg_runtime_ms + cfg_receiver_wait_ms; 667 do { 668 if (type == SOCK_STREAM) 669 do_flush_tcp(fd); 670 else 671 do_flush_datagram(fd, type); 672 673 do_poll(fd, POLLIN); 674 675 } while (gettimeofday_ms() < tstop); 676 677 if (close(fd)) 678 error(1, errno, "close"); 679 680 fprintf(stderr, "rx=%lu (%lu MB)\n", packets, bytes >> 20); 681 } 682 683 static void do_test(int domain, int type, int protocol) 684 { 685 int i; 686 687 if (cfg_cork && (domain == PF_PACKET || type != SOCK_DGRAM)) 688 error(1, 0, "can only cork udp sockets"); 689 690 do_setcpu(cfg_cpu); 691 692 for (i = 0; i < IP_MAXPACKET; i++) 693 payload[i] = 'a' + (i % 26); 694 695 if (cfg_rx) 696 do_rx(domain, type, protocol); 697 else 698 do_tx(domain, type, protocol); 699 } 700 701 static void usage(const char *filepath) 702 { 703 error(1, 0, "Usage: %s [options] <test>", filepath); 704 } 705 706 static void parse_opts(int argc, char **argv) 707 { 708 const int max_payload_len = sizeof(payload) - 709 sizeof(struct ipv6hdr) - 710 sizeof(struct tcphdr) - 711 40 /* max tcp options */; 712 int c; 713 char *daddr = NULL, *saddr = NULL; 714 char *cfg_test; 715 716 cfg_payload_len = max_payload_len; 717 718 while ((c = getopt(argc, argv, "46c:C:D:i:l:mp:rs:S:t:vz")) != -1) { 719 switch (c) { 720 case '4': 721 if (cfg_family != PF_UNSPEC) 722 error(1, 0, "Pass one of -4 or -6"); 723 cfg_family = PF_INET; 724 cfg_alen = sizeof(struct sockaddr_in); 725 break; 726 case '6': 727 if (cfg_family != PF_UNSPEC) 728 error(1, 0, "Pass one of -4 or -6"); 729 cfg_family = PF_INET6; 730 cfg_alen = sizeof(struct sockaddr_in6); 731 break; 732 case 'c': 733 cfg_cork = strtol(optarg, NULL, 0); 734 break; 735 case 'C': 736 cfg_cpu = strtol(optarg, NULL, 0); 737 break; 738 case 'D': 739 daddr = optarg; 740 break; 741 case 'i': 742 cfg_ifindex = if_nametoindex(optarg); 743 if (cfg_ifindex == 0) 744 error(1, errno, "invalid iface: %s", optarg); 745 break; 746 case 'l': 747 cfg_notification_limit = strtoul(optarg, NULL, 0); 748 break; 749 case 'm': 750 cfg_cork_mixed = true; 751 break; 752 case 'p': 753 cfg_port = strtoul(optarg, NULL, 0); 754 break; 755 case 'r': 756 cfg_rx = true; 757 break; 758 case 's': 759 cfg_payload_len = strtoul(optarg, NULL, 0); 760 break; 761 case 'S': 762 saddr = optarg; 763 break; 764 case 't': 765 cfg_runtime_ms = 200 + strtoul(optarg, NULL, 10) * 1000; 766 break; 767 case 'v': 768 cfg_verbose++; 769 break; 770 case 'z': 771 cfg_zerocopy = true; 772 break; 773 } 774 } 775 776 cfg_test = argv[argc - 1]; 777 if (strcmp(cfg_test, "rds") == 0) { 778 if (!daddr) 779 error(1, 0, "-D <server addr> required for PF_RDS\n"); 780 if (!cfg_rx && !saddr) 781 error(1, 0, "-S <client addr> required for PF_RDS\n"); 782 } 783 setup_sockaddr(cfg_family, daddr, &cfg_dst_addr); 784 setup_sockaddr(cfg_family, saddr, &cfg_src_addr); 785 786 if (cfg_payload_len > max_payload_len) 787 error(1, 0, "-s: payload exceeds max (%d)", max_payload_len); 788 if (cfg_cork_mixed && (!cfg_zerocopy || !cfg_cork)) 789 error(1, 0, "-m: cork_mixed requires corking and zerocopy"); 790 791 if (optind != argc - 1) 792 usage(argv[0]); 793 } 794 795 int main(int argc, char **argv) 796 { 797 const char *cfg_test; 798 799 parse_opts(argc, argv); 800 801 cfg_test = argv[argc - 1]; 802 803 if (!strcmp(cfg_test, "packet")) 804 do_test(PF_PACKET, SOCK_RAW, 0); 805 else if (!strcmp(cfg_test, "packet_dgram")) 806 do_test(PF_PACKET, SOCK_DGRAM, 0); 807 else if (!strcmp(cfg_test, "raw")) 808 do_test(cfg_family, SOCK_RAW, IPPROTO_EGP); 809 else if (!strcmp(cfg_test, "raw_hdrincl")) 810 do_test(cfg_family, SOCK_RAW, IPPROTO_RAW); 811 else if (!strcmp(cfg_test, "tcp")) 812 do_test(cfg_family, SOCK_STREAM, 0); 813 else if (!strcmp(cfg_test, "udp")) 814 do_test(cfg_family, SOCK_DGRAM, 0); 815 else if (!strcmp(cfg_test, "rds")) 816 do_test(PF_RDS, SOCK_SEQPACKET, 0); 817 else 818 error(1, 0, "unknown cfg_test %s", cfg_test); 819 820 return 0; 821 } 822