tools/testing/selftests/net/udpgso_bench_tx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #define _GNU_SOURCE
   4
   5 #include <arpa/inet.h>
   6 #include <errno.h>
   7 #include <error.h>
   8 #include <linux/errqueue.h>
   9 #include <linux/net_tstamp.h>
  10 #include <netinet/if_ether.h>
  11 #include <netinet/in.h>
  12 #include <netinet/ip.h>
  13 #include <netinet/ip6.h>
  14 #include <netinet/udp.h>
  15 #include <poll.h>
  16 #include <sched.h>
  17 #include <signal.h>
  18 #include <stdbool.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <sys/socket.h>
  23 #include <sys/time.h>
  24 #include <sys/poll.h>
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27
  28 #include "../kselftest.h"
  29
  30 #ifndef ETH_MAX_MTU
  31 #define ETH_MAX_MTU 0xFFFFU
  32 #endif
  33
  34 #ifndef UDP_SEGMENT
  35 #define UDP_SEGMENT             103
  36 #endif
  37
  38 #ifndef SO_ZEROCOPY
  39 #define SO_ZEROCOPY     60
  40 #endif
  41
  42 #ifndef SO_EE_ORIGIN_ZEROCOPY
  43 #define SO_EE_ORIGIN_ZEROCOPY 5
  44 #endif
  45
  46 #ifndef MSG_ZEROCOPY
  47 #define MSG_ZEROCOPY    0x4000000
  48 #endif
  49
  50 #ifndef ENOTSUPP
  51 #define ENOTSUPP        524
  52 #endif
  53
  54 #define NUM_PKT         100
  55
  56 static bool     cfg_cache_trash;
  57 static int      cfg_cpu         = -1;
  58 static int      cfg_connected   = true;
  59 static int      cfg_family      = PF_UNSPEC;
  60 static uint16_t cfg_mss;
  61 static int      cfg_payload_len = (1472 * 42);
  62 static int      cfg_port        = 8000;
  63 static int      cfg_runtime_ms  = -1;
  64 static bool     cfg_poll;
  65 static bool     cfg_segment;
  66 static bool     cfg_sendmmsg;
  67 static bool     cfg_tcp;
  68 static uint32_t cfg_tx_ts = SOF_TIMESTAMPING_TX_SOFTWARE;
  69 static bool     cfg_tx_tstamp;
  70 static bool     cfg_audit;
  71 static bool     cfg_verbose;
  72 static bool     cfg_zerocopy;
  73 static int      cfg_msg_nr;
  74 static uint16_t cfg_gso_size;
  75 static unsigned long total_num_msgs;
  76 static unsigned long total_num_sends;
  77 static unsigned long stat_tx_ts;
  78 static unsigned long stat_tx_ts_errors;
  79 static unsigned long tstart;
  80 static unsigned long tend;
  81 static unsigned long stat_zcopies;
  82
  83 static socklen_t cfg_alen;
  84 static struct sockaddr_storage cfg_dst_addr;
  85
  86 static bool interrupted;
  87 static char buf[NUM_PKT][ETH_MAX_MTU];
  88
  89 static void sigint_handler(int signum)
  90 {
  91         if (signum == SIGINT)
  92                 interrupted = true;
  93 }
  94
  95 static unsigned long gettimeofday_ms(void)
  96 {
  97         struct timeval tv;
  98
  99         gettimeofday(&tv, NULL);
 100         return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
 101 }
 102
 103 static int set_cpu(int cpu)
 104 {
 105         cpu_set_t mask;
 106
 107         CPU_ZERO(&mask);
 108         CPU_SET(cpu, &mask);
 109         if (sched_setaffinity(0, sizeof(mask), &mask))
 110                 error(1, 0, "setaffinity %d", cpu);
 111
 112         return 0;
 113 }
 114
 115 static void setup_sockaddr(int domain, const char *str_addr, void *sockaddr)
 116 {
 117         struct sockaddr_in6 *addr6 = (void *) sockaddr;
 118         struct sockaddr_in *addr4 = (void *) sockaddr;
 119
 120         switch (domain) {
 121         case PF_INET:
 122                 addr4->sin_family = AF_INET;
 123                 addr4->sin_port = htons(cfg_port);
 124                 if (inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1)
 125                         error(1, 0, "ipv4 parse error: %s", str_addr);
 126                 break;
 127         case PF_INET6:
 128                 addr6->sin6_family = AF_INET6;
 129                 addr6->sin6_port = htons(cfg_port);
 130                 if (inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1)
 131                         error(1, 0, "ipv6 parse error: %s", str_addr);
 132                 break;
 133         default:
 134                 error(1, 0, "illegal domain");
 135         }
 136 }
 137
 138 static void flush_cmsg(struct cmsghdr *cmsg)
 139 {
 140         struct sock_extended_err *err;
 141         struct scm_timestamping *tss;
 142         __u32 lo;
 143         __u32 hi;
 144         int i;
 145
 146         switch (cmsg->cmsg_level) {
 147         case SOL_SOCKET:
 148                 if (cmsg->cmsg_type == SO_TIMESTAMPING) {
 149                         i = (cfg_tx_ts == SOF_TIMESTAMPING_TX_HARDWARE) ? 2 : 0;
 150                         tss = (struct scm_timestamping *)CMSG_DATA(cmsg);
 151                         if (tss->ts[i].tv_sec == 0)
 152                                 stat_tx_ts_errors++;
 153                 } else {
 154                         error(1, 0, "unknown SOL_SOCKET cmsg type=%u\n",
 155                               cmsg->cmsg_type);
 156                 }
 157                 break;
 158         case SOL_IP:
 159         case SOL_IPV6:
 160                 switch (cmsg->cmsg_type) {
 161                 case IP_RECVERR:
 162                 case IPV6_RECVERR:
 163                 {
 164                         err = (struct sock_extended_err *)CMSG_DATA(cmsg);
 165                         switch (err->ee_origin) {
 166                         case SO_EE_ORIGIN_TIMESTAMPING:
 167                                 /* Got a TX timestamp from error queue */
 168                                 stat_tx_ts++;
 169                                 break;
 170                         case SO_EE_ORIGIN_ICMP:
 171                         case SO_EE_ORIGIN_ICMP6:
 172                                 if (cfg_verbose)
 173                                         fprintf(stderr,
 174                                                 "received ICMP error: type=%u, code=%u\n",
 175                                                 err->ee_type, err->ee_code);
 176                                 break;
 177                         case SO_EE_ORIGIN_ZEROCOPY:
 178                         {
 179                                 lo = err->ee_info;
 180                                 hi = err->ee_data;
 181                                 /* range of IDs acknowledged */
 182                                 stat_zcopies += hi - lo + 1;
 183                                 break;
 184                         }
 185                         case SO_EE_ORIGIN_LOCAL:
 186                                 if (cfg_verbose)
 187                                         fprintf(stderr,
 188                                                 "received packet with local origin: %u\n",
 189                                                 err->ee_origin);
 190                                 break;
 191                         default:
 192                                 error(0, 1, "received packet with origin: %u",
 193                                       err->ee_origin);
 194                         }
 195                         break;
 196                 }
 197                 default:
 198                         error(0, 1, "unknown IP msg type=%u\n",
 199                               cmsg->cmsg_type);
 200                         break;
 201                 }
 202                 break;
 203         default:
 204                 error(0, 1, "unknown cmsg level=%u\n",
 205                       cmsg->cmsg_level);
 206         }
 207 }
 208
 209 static void flush_errqueue_recv(int fd)
 210 {
 211         char control[CMSG_SPACE(sizeof(struct scm_timestamping)) +
 212                      CMSG_SPACE(sizeof(struct sock_extended_err)) +
 213                      CMSG_SPACE(sizeof(struct sockaddr_in6))] = {0};
 214         struct msghdr msg = {0};
 215         struct cmsghdr *cmsg;
 216         int ret;
 217
 218         while (1) {
 219                 msg.msg_control = control;
 220                 msg.msg_controllen = sizeof(control);
 221                 ret = recvmsg(fd, &msg, MSG_ERRQUEUE);
 222                 if (ret == -1 && errno == EAGAIN)
 223                         break;
 224                 if (ret == -1)
 225                         error(1, errno, "errqueue");
 226                 if (msg.msg_flags != MSG_ERRQUEUE)
 227                         error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags);
 228                 if (cfg_audit) {
 229                         for (cmsg = CMSG_FIRSTHDR(&msg);
 230                                         cmsg;
 231                                         cmsg = CMSG_NXTHDR(&msg, cmsg))
 232                                 flush_cmsg(cmsg);
 233                 }
 234                 msg.msg_flags = 0;
 235         }
 236 }
 237
 238 static void flush_errqueue(int fd, const bool do_poll)
 239 {
 240         if (do_poll) {
 241                 struct pollfd fds = {0};
 242                 int ret;
 243
 244                 fds.fd = fd;
 245                 ret = poll(&fds, 1, 500);
 246                 if (ret == 0) {
 247                         if (cfg_verbose)
 248                                 fprintf(stderr, "poll timeout\n");
 249                 } else if (ret < 0) {
 250                         error(1, errno, "poll");
 251                 }
 252         }
 253
 254         flush_errqueue_recv(fd);
 255 }
 256
 257 static int send_tcp(int fd, char *data)
 258 {
 259         int ret, done = 0, count = 0;
 260
 261         while (done < cfg_payload_len) {
 262                 ret = send(fd, data + done, cfg_payload_len - done,
 263                            cfg_zerocopy ? MSG_ZEROCOPY : 0);
 264                 if (ret == -1)
 265                         error(1, errno, "write");
 266
 267                 done += ret;
 268                 count++;
 269         }
 270
 271         return count;
 272 }
 273
 274 static int send_udp(int fd, char *data)
 275 {
 276         int ret, total_len, len, count = 0;
 277
 278         total_len = cfg_payload_len;
 279
 280         while (total_len) {
 281                 len = total_len < cfg_mss ? total_len : cfg_mss;
 282
 283                 ret = sendto(fd, data, len, cfg_zerocopy ? MSG_ZEROCOPY : 0,
 284                              cfg_connected ? NULL : (void *)&cfg_dst_addr,
 285                              cfg_connected ? 0 : cfg_alen);
 286                 if (ret == -1)
 287                         error(1, errno, "write");
 288                 if (ret != len)
 289                         error(1, errno, "write: %uB != %uB\n", ret, len);
 290
 291                 total_len -= len;
 292                 count++;
 293         }
 294
 295         return count;
 296 }
 297
 298 static void send_ts_cmsg(struct cmsghdr *cm)
 299 {
 300         uint32_t *valp;
 301
 302         cm->cmsg_level = SOL_SOCKET;
 303         cm->cmsg_type = SO_TIMESTAMPING;
 304         cm->cmsg_len = CMSG_LEN(sizeof(cfg_tx_ts));
 305         valp = (void *)CMSG_DATA(cm);
 306         *valp = cfg_tx_ts;
 307 }
 308
 309 static int send_udp_sendmmsg(int fd, char *data)
 310 {
 311         char control[CMSG_SPACE(sizeof(cfg_tx_ts))] = {0};
 312         const int max_nr_msg = ETH_MAX_MTU / ETH_DATA_LEN;
 313         struct mmsghdr mmsgs[max_nr_msg];
 314         struct iovec iov[max_nr_msg];
 315         unsigned int off = 0, left;
 316         size_t msg_controllen = 0;
 317         int i = 0, ret;
 318
 319         memset(mmsgs, 0, sizeof(mmsgs));
 320
 321         if (cfg_tx_tstamp) {
 322                 struct msghdr msg = {0};
 323                 struct cmsghdr *cmsg;
 324
 325                 msg.msg_control = control;
 326                 msg.msg_controllen = sizeof(control);
 327                 cmsg = CMSG_FIRSTHDR(&msg);
 328                 send_ts_cmsg(cmsg);
 329                 msg_controllen += CMSG_SPACE(sizeof(cfg_tx_ts));
 330         }
 331
 332         left = cfg_payload_len;
 333         while (left) {
 334                 if (i == max_nr_msg)
 335                         error(1, 0, "sendmmsg: exceeds max_nr_msg");
 336
 337                 iov[i].iov_base = data + off;
 338                 iov[i].iov_len = cfg_mss < left ? cfg_mss : left;
 339
 340                 mmsgs[i].msg_hdr.msg_iov = iov + i;
 341                 mmsgs[i].msg_hdr.msg_iovlen = 1;
 342
 343                 mmsgs[i].msg_hdr.msg_name = (void *)&cfg_dst_addr;
 344                 mmsgs[i].msg_hdr.msg_namelen = cfg_alen;
 345                 if (msg_controllen) {
 346                         mmsgs[i].msg_hdr.msg_control = control;
 347                         mmsgs[i].msg_hdr.msg_controllen = msg_controllen;
 348                 }
 349
 350                 off += iov[i].iov_len;
 351                 left -= iov[i].iov_len;
 352                 i++;
 353         }
 354
 355         ret = sendmmsg(fd, mmsgs, i, cfg_zerocopy ? MSG_ZEROCOPY : 0);
 356         if (ret == -1)
 357                 error(1, errno, "sendmmsg");
 358
 359         return ret;
 360 }
 361
 362 static void send_udp_segment_cmsg(struct cmsghdr *cm)
 363 {
 364         uint16_t *valp;
 365
 366         cm->cmsg_level = SOL_UDP;
 367         cm->cmsg_type = UDP_SEGMENT;
 368         cm->cmsg_len = CMSG_LEN(sizeof(cfg_gso_size));
 369         valp = (void *)CMSG_DATA(cm);
 370         *valp = cfg_gso_size;
 371 }
 372
 373 static int send_udp_segment(int fd, char *data)
 374 {
 375         char control[CMSG_SPACE(sizeof(cfg_gso_size)) +
 376                      CMSG_SPACE(sizeof(cfg_tx_ts))] = {0};
 377         struct msghdr msg = {0};
 378         struct iovec iov = {0};
 379         size_t msg_controllen;
 380         struct cmsghdr *cmsg;
 381         int ret;
 382
 383         iov.iov_base = data;
 384         iov.iov_len = cfg_payload_len;
 385
 386         msg.msg_iov = &iov;
 387         msg.msg_iovlen = 1;
 388
 389         msg.msg_control = control;
 390         msg.msg_controllen = sizeof(control);
 391         cmsg = CMSG_FIRSTHDR(&msg);
 392         send_udp_segment_cmsg(cmsg);
 393         msg_controllen = CMSG_SPACE(sizeof(cfg_mss));
 394         if (cfg_tx_tstamp) {
 395                 cmsg = CMSG_NXTHDR(&msg, cmsg);
 396                 send_ts_cmsg(cmsg);
 397                 msg_controllen += CMSG_SPACE(sizeof(cfg_tx_ts));
 398         }
 399
 400         msg.msg_controllen = msg_controllen;
 401         msg.msg_name = (void *)&cfg_dst_addr;
 402         msg.msg_namelen = cfg_alen;
 403
 404         ret = sendmsg(fd, &msg, cfg_zerocopy ? MSG_ZEROCOPY : 0);
 405         if (ret == -1)
 406                 error(1, errno, "sendmsg");
 407         if (ret != iov.iov_len)
 408                 error(1, 0, "sendmsg: %u != %llu\n", ret,
 409                         (unsigned long long)iov.iov_len);
 410
 411         return 1;
 412 }
 413
 414 static void usage(const char *filepath)
 415 {
 416         error(1, 0, "Usage: %s [-46acmHPtTuvz] [-C cpu] [-D dst ip] [-l secs] [-M messagenr] [-p port] [-s sendsize] [-S gsosize]",
 417                     filepath);
 418 }
 419
 420 static void parse_opts(int argc, char **argv)
 421 {
 422         int max_len, hdrlen;
 423         int c;
 424
 425         while ((c = getopt(argc, argv, "46acC:D:Hl:mM:p:s:PS:tTuvz")) != -1) {
 426                 switch (c) {
 427                 case '4':
 428                         if (cfg_family != PF_UNSPEC)
 429                                 error(1, 0, "Pass one of -4 or -6");
 430                         cfg_family = PF_INET;
 431                         cfg_alen = sizeof(struct sockaddr_in);
 432                         break;
 433                 case '6':
 434                         if (cfg_family != PF_UNSPEC)
 435                                 error(1, 0, "Pass one of -4 or -6");
 436                         cfg_family = PF_INET6;
 437                         cfg_alen = sizeof(struct sockaddr_in6);
 438                         break;
 439                 case 'a':
 440                         cfg_audit = true;
 441                         break;
 442                 case 'c':
 443                         cfg_cache_trash = true;
 444                         break;
 445                 case 'C':
 446                         cfg_cpu = strtol(optarg, NULL, 0);
 447                         break;
 448                 case 'D':
 449                         setup_sockaddr(cfg_family, optarg, &cfg_dst_addr);
 450                         break;
 451                 case 'l':
 452                         cfg_runtime_ms = strtoul(optarg, NULL, 10) * 1000;
 453                         break;
 454                 case 'm':
 455                         cfg_sendmmsg = true;
 456                         break;
 457                 case 'M':
 458                         cfg_msg_nr = strtoul(optarg, NULL, 10);
 459                         break;
 460                 case 'p':
 461                         cfg_port = strtoul(optarg, NULL, 0);
 462                         break;
 463                 case 'P':
 464                         cfg_poll = true;
 465                         break;
 466                 case 's':
 467                         cfg_payload_len = strtoul(optarg, NULL, 0);
 468                         break;
 469                 case 'S':
 470                         cfg_gso_size = strtoul(optarg, NULL, 0);
 471                         cfg_segment = true;
 472                         break;
 473                 case 'H':
 474                         cfg_tx_ts = SOF_TIMESTAMPING_TX_HARDWARE;
 475                         cfg_tx_tstamp = true;
 476                         break;
 477                 case 't':
 478                         cfg_tcp = true;
 479                         break;
 480                 case 'T':
 481                         cfg_tx_tstamp = true;
 482                         break;
 483                 case 'u':
 484                         cfg_connected = false;
 485                         break;
 486                 case 'v':
 487                         cfg_verbose = true;
 488                         break;
 489                 case 'z':
 490                         cfg_zerocopy = true;
 491                         break;
 492                 }
 493         }
 494
 495         if (optind != argc)
 496                 usage(argv[0]);
 497
 498         if (cfg_family == PF_UNSPEC)
 499                 error(1, 0, "must pass one of -4 or -6");
 500         if (cfg_tcp && !cfg_connected)
 501                 error(1, 0, "connectionless tcp makes no sense");
 502         if (cfg_segment && cfg_sendmmsg)
 503                 error(1, 0, "cannot combine segment offload and sendmmsg");
 504         if (cfg_tx_tstamp && !(cfg_segment || cfg_sendmmsg))
 505                 error(1, 0, "Options -T and -H require either -S or -m option");
 506
 507         if (cfg_family == PF_INET)
 508                 hdrlen = sizeof(struct iphdr) + sizeof(struct udphdr);
 509         else
 510                 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct udphdr);
 511
 512         cfg_mss = ETH_DATA_LEN - hdrlen;
 513         max_len = ETH_MAX_MTU - hdrlen;
 514         if (!cfg_gso_size)
 515                 cfg_gso_size = cfg_mss;
 516
 517         if (cfg_payload_len > max_len)
 518                 error(1, 0, "payload length %u exceeds max %u",
 519                       cfg_payload_len, max_len);
 520 }
 521
 522 static void set_pmtu_discover(int fd, bool is_ipv4)
 523 {
 524         int level, name, val;
 525
 526         if (is_ipv4) {
 527                 level   = SOL_IP;
 528                 name    = IP_MTU_DISCOVER;
 529                 val     = IP_PMTUDISC_DO;
 530         } else {
 531                 level   = SOL_IPV6;
 532                 name    = IPV6_MTU_DISCOVER;
 533                 val     = IPV6_PMTUDISC_DO;
 534         }
 535
 536         if (setsockopt(fd, level, name, &val, sizeof(val)))
 537                 error(1, errno, "setsockopt path mtu");
 538 }
 539
 540 static void set_tx_timestamping(int fd)
 541 {
 542         int val = SOF_TIMESTAMPING_OPT_CMSG | SOF_TIMESTAMPING_OPT_ID |
 543                         SOF_TIMESTAMPING_OPT_TSONLY;
 544
 545         if (cfg_tx_ts == SOF_TIMESTAMPING_TX_SOFTWARE)
 546                 val |= SOF_TIMESTAMPING_SOFTWARE;
 547         else
 548                 val |= SOF_TIMESTAMPING_RAW_HARDWARE;
 549
 550         if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, &val, sizeof(val)))
 551                 error(1, errno, "setsockopt tx timestamping");
 552 }
 553
 554 static void print_audit_report(unsigned long num_msgs, unsigned long num_sends)
 555 {
 556         unsigned long tdelta;
 557
 558         tdelta = tend - tstart;
 559         if (!tdelta)
 560                 return;
 561
 562         fprintf(stderr, "Summary over %lu.%03lu seconds...\n",
 563                         tdelta / 1000, tdelta % 1000);
 564         fprintf(stderr,
 565                 "sum %s tx: %6lu MB/s %10lu calls (%lu/s) %10lu msgs (%lu/s)\n",
 566                 cfg_tcp ? "tcp" : "udp",
 567                 ((num_msgs * cfg_payload_len) >> 10) / tdelta,
 568                 num_sends, num_sends * 1000 / tdelta,
 569                 num_msgs, num_msgs * 1000 / tdelta);
 570
 571         if (cfg_tx_tstamp) {
 572                 if (stat_tx_ts_errors)
 573                         error(1, 0,
 574                               "Expected clean TX Timestamps: %9lu msgs received %6lu errors",
 575                               stat_tx_ts, stat_tx_ts_errors);
 576                 if (stat_tx_ts != num_sends)
 577                         error(1, 0,
 578                               "Unexpected number of TX Timestamps: %9lu expected %9lu received",
 579                               num_sends, stat_tx_ts);
 580                 fprintf(stderr,
 581                         "Tx Timestamps: %19lu received %17lu errors\n",
 582                         stat_tx_ts, stat_tx_ts_errors);
 583         }
 584
 585         if (cfg_zerocopy) {
 586                 if (stat_zcopies != num_sends)
 587                         error(1, 0, "Unexpected number of Zerocopy completions: %9lu expected %9lu received",
 588                               num_sends, stat_zcopies);
 589                 fprintf(stderr,
 590                         "Zerocopy acks: %19lu\n",
 591                         stat_zcopies);
 592         }
 593 }
 594
 595 static void print_report(unsigned long num_msgs, unsigned long num_sends)
 596 {
 597         fprintf(stderr,
 598                 "%s tx: %6lu MB/s %8lu calls/s %6lu msg/s\n",
 599                 cfg_tcp ? "tcp" : "udp",
 600                 (num_msgs * cfg_payload_len) >> 20,
 601                 num_sends, num_msgs);
 602
 603         if (cfg_audit) {
 604                 total_num_msgs += num_msgs;
 605                 total_num_sends += num_sends;
 606         }
 607 }
 608
 609 int main(int argc, char **argv)
 610 {
 611         unsigned long num_msgs, num_sends;
 612         unsigned long tnow, treport, tstop;
 613         int fd, i, val, ret;
 614
 615         parse_opts(argc, argv);
 616
 617         if (cfg_cpu > 0)
 618                 set_cpu(cfg_cpu);
 619
 620         for (i = 0; i < sizeof(buf[0]); i++)
 621                 buf[0][i] = 'a' + (i % 26);
 622         for (i = 1; i < NUM_PKT; i++)
 623                 memcpy(buf[i], buf[0], sizeof(buf[0]));
 624
 625         signal(SIGINT, sigint_handler);
 626
 627         fd = socket(cfg_family, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
 628         if (fd == -1)
 629                 error(1, errno, "socket");
 630
 631         if (cfg_zerocopy) {
 632                 val = 1;
 633
 634                 ret = setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY,
 635                                  &val, sizeof(val));
 636                 if (ret) {
 637                         if (errno == ENOPROTOOPT || errno == ENOTSUPP) {
 638                                 fprintf(stderr, "SO_ZEROCOPY not supported");
 639                                 exit(KSFT_SKIP);
 640                         }
 641                         error(1, errno, "setsockopt zerocopy");
 642                 }
 643         }
 644
 645         if (cfg_connected &&
 646             connect(fd, (void *)&cfg_dst_addr, cfg_alen))
 647                 error(1, errno, "connect");
 648
 649         if (cfg_segment)
 650                 set_pmtu_discover(fd, cfg_family == PF_INET);
 651
 652         if (cfg_tx_tstamp)
 653                 set_tx_timestamping(fd);
 654
 655         num_msgs = num_sends = 0;
 656         tnow = gettimeofday_ms();
 657         tstart = tnow;
 658         tend = tnow;
 659         tstop = tnow + cfg_runtime_ms;
 660         treport = tnow + 1000;
 661
 662         i = 0;
 663         do {
 664                 if (cfg_tcp)
 665                         num_sends += send_tcp(fd, buf[i]);
 666                 else if (cfg_segment)
 667                         num_sends += send_udp_segment(fd, buf[i]);
 668                 else if (cfg_sendmmsg)
 669                         num_sends += send_udp_sendmmsg(fd, buf[i]);
 670                 else
 671                         num_sends += send_udp(fd, buf[i]);
 672                 num_msgs++;
 673                 if ((cfg_zerocopy && ((num_msgs & 0xF) == 0)) || cfg_tx_tstamp)
 674                         flush_errqueue(fd, cfg_poll);
 675
 676                 if (cfg_msg_nr && num_msgs >= cfg_msg_nr)
 677                         break;
 678
 679                 tnow = gettimeofday_ms();
 680                 if (tnow >= treport) {
 681                         print_report(num_msgs, num_sends);
 682                         num_msgs = num_sends = 0;
 683                         treport = tnow + 1000;
 684                 }
 685
 686                 /* cold cache when writing buffer */
 687                 if (cfg_cache_trash)
 688                         i = ++i < NUM_PKT ? i : 0;
 689
 690         } while (!interrupted && (cfg_runtime_ms == -1 || tnow < tstop));
 691
 692         if (cfg_zerocopy || cfg_tx_tstamp)
 693                 flush_errqueue(fd, true);
 694
 695         if (close(fd))
 696                 error(1, errno, "close");
 697
 698         if (cfg_audit) {
 699                 tend = tnow;
 700                 total_num_msgs += num_msgs;
 701                 total_num_sends += num_sends;
 702                 print_audit_report(total_num_msgs, total_num_sends);
 703         }
 704
 705         return 0;
 706 }