tools/testing/selftests/net/udpgso_bench_rx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #define _GNU_SOURCE
   4
   5 #include <arpa/inet.h>
   6 #include <error.h>
   7 #include <errno.h>
   8 #include <limits.h>
   9 #include <linux/errqueue.h>
  10 #include <linux/if_packet.h>
  11 #include <linux/socket.h>
  12 #include <linux/sockios.h>
  13 #include <net/ethernet.h>
  14 #include <net/if.h>
  15 #include <netinet/ip.h>
  16 #include <netinet/ip6.h>
  17 #include <netinet/tcp.h>
  18 #include <netinet/udp.h>
  19 #include <poll.h>
  20 #include <sched.h>
  21 #include <stdbool.h>
  22 #include <stdio.h>
  23 #include <stdint.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/socket.h>
  28 #include <sys/stat.h>
  29 #include <sys/time.h>
  30 #include <sys/types.h>
  31 #include <sys/wait.h>
  32 #include <unistd.h>
  33
  34 #ifndef UDP_GRO
  35 #define UDP_GRO         104
  36 #endif
  37
  38 static int  cfg_port            = 8000;
  39 static bool cfg_tcp;
  40 static bool cfg_verify;
  41 static bool cfg_read_all;
  42 static bool cfg_gro_segment;
  43 static int  cfg_family          = PF_INET6;
  44 static int  cfg_alen            = sizeof(struct sockaddr_in6);
  45 static int  cfg_expected_pkt_nr;
  46 static int  cfg_expected_pkt_len;
  47 static int  cfg_expected_gso_size;
  48 static int  cfg_connect_timeout_ms;
  49 static int  cfg_rcv_timeout_ms;
  50 static struct sockaddr_storage cfg_bind_addr;
  51
  52 static bool interrupted;
  53 static unsigned long packets, bytes;
  54
  55 static void sigint_handler(int signum)
  56 {
  57         if (signum == SIGINT)
  58                 interrupted = true;
  59 }
  60
  61 static void setup_sockaddr(int domain, const char *str_addr, void *sockaddr)
  62 {
  63         struct sockaddr_in6 *addr6 = (void *) sockaddr;
  64         struct sockaddr_in *addr4 = (void *) sockaddr;
  65
  66         switch (domain) {
  67         case PF_INET:
  68                 addr4->sin_family = AF_INET;
  69                 addr4->sin_port = htons(cfg_port);
  70                 if (inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1)
  71                         error(1, 0, "ipv4 parse error: %s", str_addr);
  72                 break;
  73         case PF_INET6:
  74                 addr6->sin6_family = AF_INET6;
  75                 addr6->sin6_port = htons(cfg_port);
  76                 if (inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1)
  77                         error(1, 0, "ipv6 parse error: %s", str_addr);
  78                 break;
  79         default:
  80                 error(1, 0, "illegal domain");
  81         }
  82 }
  83
  84 static unsigned long gettimeofday_ms(void)
  85 {
  86         struct timeval tv;
  87
  88         gettimeofday(&tv, NULL);
  89         return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
  90 }
  91
  92 static void do_poll(int fd, int timeout_ms)
  93 {
  94         struct pollfd pfd;
  95         int ret;
  96
  97         pfd.events = POLLIN;
  98         pfd.revents = 0;
  99         pfd.fd = fd;
 100
 101         do {
 102                 ret = poll(&pfd, 1, 10);
 103                 if (interrupted)
 104                         break;
 105                 if (ret == -1)
 106                         error(1, errno, "poll");
 107                 if (ret == 0) {
 108                         if (!timeout_ms)
 109                                 continue;
 110
 111                         timeout_ms -= 10;
 112                         if (timeout_ms <= 0) {
 113                                 interrupted = true;
 114                                 break;
 115                         }
 116
 117                         /* no events and more time to wait, do poll again */
 118                         continue;
 119                 }
 120                 if (pfd.revents != POLLIN)
 121                         error(1, errno, "poll: 0x%x expected 0x%x\n",
 122                                         pfd.revents, POLLIN);
 123         } while (!ret);
 124 }
 125
 126 static int do_socket(bool do_tcp)
 127 {
 128         int fd, val;
 129
 130         fd = socket(cfg_family, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
 131         if (fd == -1)
 132                 error(1, errno, "socket");
 133
 134         val = 1 << 21;
 135         if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)))
 136                 error(1, errno, "setsockopt rcvbuf");
 137         val = 1;
 138         if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val)))
 139                 error(1, errno, "setsockopt reuseport");
 140
 141         if (bind(fd, (void *)&cfg_bind_addr, cfg_alen))
 142                 error(1, errno, "bind");
 143
 144         if (do_tcp) {
 145                 int accept_fd = fd;
 146
 147                 if (listen(accept_fd, 1))
 148                         error(1, errno, "listen");
 149
 150                 do_poll(accept_fd, cfg_connect_timeout_ms);
 151                 if (interrupted)
 152                         exit(0);
 153
 154                 fd = accept(accept_fd, NULL, NULL);
 155                 if (fd == -1)
 156                         error(1, errno, "accept");
 157                 if (close(accept_fd))
 158                         error(1, errno, "close accept fd");
 159         }
 160
 161         return fd;
 162 }
 163
 164 /* Flush all outstanding bytes for the tcp receive queue */
 165 static void do_flush_tcp(int fd)
 166 {
 167         int ret;
 168
 169         while (true) {
 170                 /* MSG_TRUNC flushes up to len bytes */
 171                 ret = recv(fd, NULL, 1 << 21, MSG_TRUNC | MSG_DONTWAIT);
 172                 if (ret == -1 && errno == EAGAIN)
 173                         return;
 174                 if (ret == -1)
 175                         error(1, errno, "flush");
 176                 if (ret == 0) {
 177                         /* client detached */
 178                         exit(0);
 179                 }
 180
 181                 packets++;
 182                 bytes += ret;
 183         }
 184
 185 }
 186
 187 static char sanitized_char(char val)
 188 {
 189         return (val >= 'a' && val <= 'z') ? val : '.';
 190 }
 191
 192 static void do_verify_udp(const char *data, int len)
 193 {
 194         char cur = data[0];
 195         int i;
 196
 197         /* verify contents */
 198         if (cur < 'a' || cur > 'z')
 199                 error(1, 0, "data initial byte out of range");
 200
 201         for (i = 1; i < len; i++) {
 202                 if (cur == 'z')
 203                         cur = 'a';
 204                 else
 205                         cur++;
 206
 207                 if (data[i] != cur)
 208                         error(1, 0, "data[%d]: len %d, %c(%hhu) != %c(%hhu)\n",
 209                               i, len,
 210                               sanitized_char(data[i]), data[i],
 211                               sanitized_char(cur), cur);
 212         }
 213 }
 214
 215 static int recv_msg(int fd, char *buf, int len, int *gso_size)
 216 {
 217         char control[CMSG_SPACE(sizeof(int))] = {0};
 218         struct msghdr msg = {0};
 219         struct iovec iov = {0};
 220         struct cmsghdr *cmsg;
 221         int ret;
 222
 223         iov.iov_base = buf;
 224         iov.iov_len = len;
 225
 226         msg.msg_iov = &iov;
 227         msg.msg_iovlen = 1;
 228
 229         msg.msg_control = control;
 230         msg.msg_controllen = sizeof(control);
 231
 232         *gso_size = -1;
 233         ret = recvmsg(fd, &msg, MSG_TRUNC | MSG_DONTWAIT);
 234         if (ret != -1) {
 235                 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
 236                      cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 237                         if (cmsg->cmsg_level == SOL_UDP
 238                             && cmsg->cmsg_type == UDP_GRO) {
 239                                 *gso_size = *(int *)CMSG_DATA(cmsg);
 240                                 break;
 241                         }
 242                 }
 243         }
 244         return ret;
 245 }
 246
 247 /* Flush all outstanding datagrams. Verify first few bytes of each. */
 248 static void do_flush_udp(int fd)
 249 {
 250         static char rbuf[ETH_MAX_MTU];
 251         int ret, len, gso_size = 0, budget = 256;
 252
 253         len = cfg_read_all ? sizeof(rbuf) : 0;
 254         while (budget--) {
 255                 /* MSG_TRUNC will make return value full datagram length */
 256                 if (!cfg_expected_gso_size)
 257                         ret = recv(fd, rbuf, len, MSG_TRUNC | MSG_DONTWAIT);
 258                 else
 259                         ret = recv_msg(fd, rbuf, len, &gso_size);
 260                 if (ret == -1 && errno == EAGAIN)
 261                         break;
 262                 if (ret == -1)
 263                         error(1, errno, "recv");
 264                 if (cfg_expected_pkt_len && ret != cfg_expected_pkt_len)
 265                         error(1, 0, "recv: bad packet len, got %d,"
 266                               " expected %d\n", ret, cfg_expected_pkt_len);
 267                 if (len && cfg_verify) {
 268                         if (ret == 0)
 269                                 error(1, errno, "recv: 0 byte datagram\n");
 270
 271                         do_verify_udp(rbuf, ret);
 272                 }
 273                 if (cfg_expected_gso_size && cfg_expected_gso_size != gso_size)
 274                         error(1, 0, "recv: bad gso size, got %d, expected %d "
 275                               "(-1 == no gso cmsg))\n", gso_size,
 276                               cfg_expected_gso_size);
 277
 278                 packets++;
 279                 bytes += ret;
 280                 if (cfg_expected_pkt_nr && packets >= cfg_expected_pkt_nr)
 281                         break;
 282         }
 283 }
 284
 285 static void usage(const char *filepath)
 286 {
 287         error(1, 0, "Usage: %s [-C connect_timeout] [-Grtv] [-b addr] [-p port]"
 288               " [-l pktlen] [-n packetnr] [-R rcv_timeout] [-S gsosize]",
 289               filepath);
 290 }
 291
 292 static void parse_opts(int argc, char **argv)
 293 {
 294         const char *bind_addr = NULL;
 295         int c;
 296
 297         while ((c = getopt(argc, argv, "4b:C:Gl:n:p:rR:S:tv")) != -1) {
 298                 switch (c) {
 299                 case '4':
 300                         cfg_family = PF_INET;
 301                         cfg_alen = sizeof(struct sockaddr_in);
 302                         break;
 303                 case 'b':
 304                         bind_addr = optarg;
 305                         break;
 306                 case 'C':
 307                         cfg_connect_timeout_ms = strtoul(optarg, NULL, 0);
 308                         break;
 309                 case 'G':
 310                         cfg_gro_segment = true;
 311                         break;
 312                 case 'l':
 313                         cfg_expected_pkt_len = strtoul(optarg, NULL, 0);
 314                         break;
 315                 case 'n':
 316                         cfg_expected_pkt_nr = strtoul(optarg, NULL, 0);
 317                         break;
 318                 case 'p':
 319                         cfg_port = strtoul(optarg, NULL, 0);
 320                         break;
 321                 case 'r':
 322                         cfg_read_all = true;
 323                         break;
 324                 case 'R':
 325                         cfg_rcv_timeout_ms = strtoul(optarg, NULL, 0);
 326                         break;
 327                 case 'S':
 328                         cfg_expected_gso_size = strtol(optarg, NULL, 0);
 329                         break;
 330                 case 't':
 331                         cfg_tcp = true;
 332                         break;
 333                 case 'v':
 334                         cfg_verify = true;
 335                         cfg_read_all = true;
 336                         break;
 337                 default:
 338                         exit(1);
 339                 }
 340         }
 341
 342         if (!bind_addr)
 343                 bind_addr = cfg_family == PF_INET6 ? "::" : "0.0.0.0";
 344
 345         setup_sockaddr(cfg_family, bind_addr, &cfg_bind_addr);
 346
 347         if (optind != argc)
 348                 usage(argv[0]);
 349
 350         if (cfg_tcp && cfg_verify)
 351                 error(1, 0, "TODO: implement verify mode for tcp");
 352 }
 353
 354 static void do_recv(void)
 355 {
 356         int timeout_ms = cfg_tcp ? cfg_rcv_timeout_ms : cfg_connect_timeout_ms;
 357         unsigned long tnow, treport;
 358         int fd;
 359
 360         fd = do_socket(cfg_tcp);
 361
 362         if (cfg_gro_segment && !cfg_tcp) {
 363                 int val = 1;
 364                 if (setsockopt(fd, IPPROTO_UDP, UDP_GRO, &val, sizeof(val)))
 365                         error(1, errno, "setsockopt UDP_GRO");
 366         }
 367
 368         treport = gettimeofday_ms() + 1000;
 369         do {
 370                 do_poll(fd, timeout_ms);
 371
 372                 if (cfg_tcp)
 373                         do_flush_tcp(fd);
 374                 else
 375                         do_flush_udp(fd);
 376
 377                 tnow = gettimeofday_ms();
 378                 if (!cfg_expected_pkt_nr && tnow > treport) {
 379                         if (packets)
 380                                 fprintf(stderr,
 381                                         "%s rx: %6lu MB/s %8lu calls/s\n",
 382                                         cfg_tcp ? "tcp" : "udp",
 383                                         bytes >> 20, packets);
 384                         bytes = packets = 0;
 385                         treport = tnow + 1000;
 386                 }
 387
 388                 timeout_ms = cfg_rcv_timeout_ms;
 389
 390         } while (!interrupted);
 391
 392         if (cfg_expected_pkt_nr && (packets != cfg_expected_pkt_nr))
 393                 error(1, 0, "wrong packet number! got %ld, expected %d\n",
 394                       packets, cfg_expected_pkt_nr);
 395
 396         if (close(fd))
 397                 error(1, errno, "close");
 398 }
 399
 400 int main(int argc, char **argv)
 401 {
 402         parse_opts(argc, argv);
 403
 404         signal(SIGINT, sigint_handler);
 405
 406         do_recv();
 407
 408         return 0;
 409 }