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 <netinet/if_ether.h>
   9 #include <netinet/in.h>
  10 #include <netinet/ip.h>
  11 #include <netinet/ip6.h>
  12 #include <netinet/udp.h>
  13 #include <poll.h>
  14 #include <sched.h>
  15 #include <signal.h>
  16 #include <stdbool.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <sys/socket.h>
  21 #include <sys/time.h>
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24
  25 #ifndef ETH_MAX_MTU
  26 #define ETH_MAX_MTU 0xFFFFU
  27 #endif
  28
  29 #ifndef UDP_SEGMENT
  30 #define UDP_SEGMENT             103
  31 #endif
  32
  33 #ifndef SO_ZEROCOPY
  34 #define SO_ZEROCOPY     60
  35 #endif
  36
  37 #ifndef MSG_ZEROCOPY
  38 #define MSG_ZEROCOPY    0x4000000
  39 #endif
  40
  41 #define NUM_PKT         100
  42
  43 static bool     cfg_cache_trash;
  44 static int      cfg_cpu         = -1;
  45 static int      cfg_connected   = true;
  46 static int      cfg_family      = PF_UNSPEC;
  47 static uint16_t cfg_mss;
  48 static int      cfg_payload_len = (1472 * 42);
  49 static int      cfg_port        = 8000;
  50 static int      cfg_runtime_ms  = -1;
  51 static bool     cfg_segment;
  52 static bool     cfg_sendmmsg;
  53 static bool     cfg_tcp;
  54 static bool     cfg_zerocopy;
  55
  56 static socklen_t cfg_alen;
  57 static struct sockaddr_storage cfg_dst_addr;
  58
  59 static bool interrupted;
  60 static char buf[NUM_PKT][ETH_MAX_MTU];
  61
  62 static void sigint_handler(int signum)
  63 {
  64         if (signum == SIGINT)
  65                 interrupted = true;
  66 }
  67
  68 static unsigned long gettimeofday_ms(void)
  69 {
  70         struct timeval tv;
  71
  72         gettimeofday(&tv, NULL);
  73         return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
  74 }
  75
  76 static int set_cpu(int cpu)
  77 {
  78         cpu_set_t mask;
  79
  80         CPU_ZERO(&mask);
  81         CPU_SET(cpu, &mask);
  82         if (sched_setaffinity(0, sizeof(mask), &mask))
  83                 error(1, 0, "setaffinity %d", cpu);
  84
  85         return 0;
  86 }
  87
  88 static void setup_sockaddr(int domain, const char *str_addr, void *sockaddr)
  89 {
  90         struct sockaddr_in6 *addr6 = (void *) sockaddr;
  91         struct sockaddr_in *addr4 = (void *) sockaddr;
  92
  93         switch (domain) {
  94         case PF_INET:
  95                 addr4->sin_family = AF_INET;
  96                 addr4->sin_port = htons(cfg_port);
  97                 if (inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1)
  98                         error(1, 0, "ipv4 parse error: %s", str_addr);
  99                 break;
 100         case PF_INET6:
 101                 addr6->sin6_family = AF_INET6;
 102                 addr6->sin6_port = htons(cfg_port);
 103                 if (inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1)
 104                         error(1, 0, "ipv6 parse error: %s", str_addr);
 105                 break;
 106         default:
 107                 error(1, 0, "illegal domain");
 108         }
 109 }
 110
 111 static void flush_zerocopy(int fd)
 112 {
 113         struct msghdr msg = {0};        /* flush */
 114         int ret;
 115
 116         while (1) {
 117                 ret = recvmsg(fd, &msg, MSG_ERRQUEUE);
 118                 if (ret == -1 && errno == EAGAIN)
 119                         break;
 120                 if (ret == -1)
 121                         error(1, errno, "errqueue");
 122                 if (msg.msg_flags != (MSG_ERRQUEUE | MSG_CTRUNC))
 123                         error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags);
 124                 msg.msg_flags = 0;
 125         }
 126 }
 127
 128 static int send_tcp(int fd, char *data)
 129 {
 130         int ret, done = 0, count = 0;
 131
 132         while (done < cfg_payload_len) {
 133                 ret = send(fd, data + done, cfg_payload_len - done,
 134                            cfg_zerocopy ? MSG_ZEROCOPY : 0);
 135                 if (ret == -1)
 136                         error(1, errno, "write");
 137
 138                 done += ret;
 139                 count++;
 140         }
 141
 142         return count;
 143 }
 144
 145 static int send_udp(int fd, char *data)
 146 {
 147         int ret, total_len, len, count = 0;
 148
 149         total_len = cfg_payload_len;
 150
 151         while (total_len) {
 152                 len = total_len < cfg_mss ? total_len : cfg_mss;
 153
 154                 ret = sendto(fd, data, len, cfg_zerocopy ? MSG_ZEROCOPY : 0,
 155                              cfg_connected ? NULL : (void *)&cfg_dst_addr,
 156                              cfg_connected ? 0 : cfg_alen);
 157                 if (ret == -1)
 158                         error(1, errno, "write");
 159                 if (ret != len)
 160                         error(1, errno, "write: %uB != %uB\n", ret, len);
 161
 162                 total_len -= len;
 163                 count++;
 164         }
 165
 166         return count;
 167 }
 168
 169 static int send_udp_sendmmsg(int fd, char *data)
 170 {
 171         const int max_nr_msg = ETH_MAX_MTU / ETH_DATA_LEN;
 172         struct mmsghdr mmsgs[max_nr_msg];
 173         struct iovec iov[max_nr_msg];
 174         unsigned int off = 0, left;
 175         int i = 0, ret;
 176
 177         memset(mmsgs, 0, sizeof(mmsgs));
 178
 179         left = cfg_payload_len;
 180         while (left) {
 181                 if (i == max_nr_msg)
 182                         error(1, 0, "sendmmsg: exceeds max_nr_msg");
 183
 184                 iov[i].iov_base = data + off;
 185                 iov[i].iov_len = cfg_mss < left ? cfg_mss : left;
 186
 187                 mmsgs[i].msg_hdr.msg_iov = iov + i;
 188                 mmsgs[i].msg_hdr.msg_iovlen = 1;
 189
 190                 off += iov[i].iov_len;
 191                 left -= iov[i].iov_len;
 192                 i++;
 193         }
 194
 195         ret = sendmmsg(fd, mmsgs, i, cfg_zerocopy ? MSG_ZEROCOPY : 0);
 196         if (ret == -1)
 197                 error(1, errno, "sendmmsg");
 198
 199         return ret;
 200 }
 201
 202 static void send_udp_segment_cmsg(struct cmsghdr *cm)
 203 {
 204         uint16_t *valp;
 205
 206         cm->cmsg_level = SOL_UDP;
 207         cm->cmsg_type = UDP_SEGMENT;
 208         cm->cmsg_len = CMSG_LEN(sizeof(cfg_mss));
 209         valp = (void *)CMSG_DATA(cm);
 210         *valp = cfg_mss;
 211 }
 212
 213 static int send_udp_segment(int fd, char *data)
 214 {
 215         char control[CMSG_SPACE(sizeof(cfg_mss))] = {0};
 216         struct msghdr msg = {0};
 217         struct iovec iov = {0};
 218         int ret;
 219
 220         iov.iov_base = data;
 221         iov.iov_len = cfg_payload_len;
 222
 223         msg.msg_iov = &iov;
 224         msg.msg_iovlen = 1;
 225
 226         msg.msg_control = control;
 227         msg.msg_controllen = sizeof(control);
 228         send_udp_segment_cmsg(CMSG_FIRSTHDR(&msg));
 229
 230         msg.msg_name = (void *)&cfg_dst_addr;
 231         msg.msg_namelen = cfg_alen;
 232
 233         ret = sendmsg(fd, &msg, cfg_zerocopy ? MSG_ZEROCOPY : 0);
 234         if (ret == -1)
 235                 error(1, errno, "sendmsg");
 236         if (ret != iov.iov_len)
 237                 error(1, 0, "sendmsg: %u != %lu\n", ret, iov.iov_len);
 238
 239         return 1;
 240 }
 241
 242 static void usage(const char *filepath)
 243 {
 244         error(1, 0, "Usage: %s [-46cmStuz] [-C cpu] [-D dst ip] [-l secs] [-p port] [-s sendsize]",
 245                     filepath);
 246 }
 247
 248 static void parse_opts(int argc, char **argv)
 249 {
 250         int max_len, hdrlen;
 251         int c;
 252
 253         while ((c = getopt(argc, argv, "46cC:D:l:mp:s:Stuz")) != -1) {
 254                 switch (c) {
 255                 case '4':
 256                         if (cfg_family != PF_UNSPEC)
 257                                 error(1, 0, "Pass one of -4 or -6");
 258                         cfg_family = PF_INET;
 259                         cfg_alen = sizeof(struct sockaddr_in);
 260                         break;
 261                 case '6':
 262                         if (cfg_family != PF_UNSPEC)
 263                                 error(1, 0, "Pass one of -4 or -6");
 264                         cfg_family = PF_INET6;
 265                         cfg_alen = sizeof(struct sockaddr_in6);
 266                         break;
 267                 case 'c':
 268                         cfg_cache_trash = true;
 269                         break;
 270                 case 'C':
 271                         cfg_cpu = strtol(optarg, NULL, 0);
 272                         break;
 273                 case 'D':
 274                         setup_sockaddr(cfg_family, optarg, &cfg_dst_addr);
 275                         break;
 276                 case 'l':
 277                         cfg_runtime_ms = strtoul(optarg, NULL, 10) * 1000;
 278                         break;
 279                 case 'm':
 280                         cfg_sendmmsg = true;
 281                         break;
 282                 case 'p':
 283                         cfg_port = strtoul(optarg, NULL, 0);
 284                         break;
 285                 case 's':
 286                         cfg_payload_len = strtoul(optarg, NULL, 0);
 287                         break;
 288                 case 'S':
 289                         cfg_segment = true;
 290                         break;
 291                 case 't':
 292                         cfg_tcp = true;
 293                         break;
 294                 case 'u':
 295                         cfg_connected = false;
 296                         break;
 297                 case 'z':
 298                         cfg_zerocopy = true;
 299                         break;
 300                 }
 301         }
 302
 303         if (optind != argc)
 304                 usage(argv[0]);
 305
 306         if (cfg_family == PF_UNSPEC)
 307                 error(1, 0, "must pass one of -4 or -6");
 308         if (cfg_tcp && !cfg_connected)
 309                 error(1, 0, "connectionless tcp makes no sense");
 310         if (cfg_segment && cfg_sendmmsg)
 311                 error(1, 0, "cannot combine segment offload and sendmmsg");
 312
 313         if (cfg_family == PF_INET)
 314                 hdrlen = sizeof(struct iphdr) + sizeof(struct udphdr);
 315         else
 316                 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct udphdr);
 317
 318         cfg_mss = ETH_DATA_LEN - hdrlen;
 319         max_len = ETH_MAX_MTU - hdrlen;
 320
 321         if (cfg_payload_len > max_len)
 322                 error(1, 0, "payload length %u exceeds max %u",
 323                       cfg_payload_len, max_len);
 324 }
 325
 326 static void set_pmtu_discover(int fd, bool is_ipv4)
 327 {
 328         int level, name, val;
 329
 330         if (is_ipv4) {
 331                 level   = SOL_IP;
 332                 name    = IP_MTU_DISCOVER;
 333                 val     = IP_PMTUDISC_DO;
 334         } else {
 335                 level   = SOL_IPV6;
 336                 name    = IPV6_MTU_DISCOVER;
 337                 val     = IPV6_PMTUDISC_DO;
 338         }
 339
 340         if (setsockopt(fd, level, name, &val, sizeof(val)))
 341                 error(1, errno, "setsockopt path mtu");
 342 }
 343
 344 int main(int argc, char **argv)
 345 {
 346         unsigned long num_msgs, num_sends;
 347         unsigned long tnow, treport, tstop;
 348         int fd, i, val;
 349
 350         parse_opts(argc, argv);
 351
 352         if (cfg_cpu > 0)
 353                 set_cpu(cfg_cpu);
 354
 355         for (i = 0; i < sizeof(buf[0]); i++)
 356                 buf[0][i] = 'a' + (i % 26);
 357         for (i = 1; i < NUM_PKT; i++)
 358                 memcpy(buf[i], buf[0], sizeof(buf[0]));
 359
 360         signal(SIGINT, sigint_handler);
 361
 362         fd = socket(cfg_family, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
 363         if (fd == -1)
 364                 error(1, errno, "socket");
 365
 366         if (cfg_zerocopy) {
 367                 val = 1;
 368                 if (setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &val, sizeof(val)))
 369                         error(1, errno, "setsockopt zerocopy");
 370         }
 371
 372         if (cfg_connected &&
 373             connect(fd, (void *)&cfg_dst_addr, cfg_alen))
 374                 error(1, errno, "connect");
 375
 376         if (cfg_segment)
 377                 set_pmtu_discover(fd, cfg_family == PF_INET);
 378
 379         num_msgs = num_sends = 0;
 380         tnow = gettimeofday_ms();
 381         tstop = tnow + cfg_runtime_ms;
 382         treport = tnow + 1000;
 383
 384         i = 0;
 385         do {
 386                 if (cfg_tcp)
 387                         num_sends += send_tcp(fd, buf[i]);
 388                 else if (cfg_segment)
 389                         num_sends += send_udp_segment(fd, buf[i]);
 390                 else if (cfg_sendmmsg)
 391                         num_sends += send_udp_sendmmsg(fd, buf[i]);
 392                 else
 393                         num_sends += send_udp(fd, buf[i]);
 394                 num_msgs++;
 395
 396                 if (cfg_zerocopy && ((num_msgs & 0xF) == 0))
 397                         flush_zerocopy(fd);
 398
 399                 tnow = gettimeofday_ms();
 400                 if (tnow > treport) {
 401                         fprintf(stderr,
 402                                 "%s tx: %6lu MB/s %8lu calls/s %6lu msg/s\n",
 403                                 cfg_tcp ? "tcp" : "udp",
 404                                 (num_msgs * cfg_payload_len) >> 20,
 405                                 num_sends, num_msgs);
 406                         num_msgs = num_sends = 0;
 407                         treport = tnow + 1000;
 408                 }
 409
 410                 /* cold cache when writing buffer */
 411                 if (cfg_cache_trash)
 412                         i = ++i < NUM_PKT ? i : 0;
 413
 414         } while (!interrupted && (cfg_runtime_ms == -1 || tnow < tstop));
 415
 416         if (close(fd))
 417                 error(1, errno, "close");
 418
 419         return 0;
 420 }