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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 | // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <arpa/inet.h> #include <errno.h> #include <error.h> #include <netinet/if_ether.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip6.h> #include <netinet/udp.h> #include <poll.h> #include <sched.h> #include <signal.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <sys/time.h> #include <sys/types.h> #include <unistd.h> #ifndef ETH_MAX_MTU #define ETH_MAX_MTU 0xFFFFU #endif #ifndef UDP_SEGMENT #define UDP_SEGMENT 103 #endif #ifndef SO_ZEROCOPY #define SO_ZEROCOPY 60 #endif #ifndef MSG_ZEROCOPY #define MSG_ZEROCOPY 0x4000000 #endif #define NUM_PKT 100 static bool cfg_cache_trash; static int cfg_cpu = -1; static int cfg_connected = true; static int cfg_family = PF_UNSPEC; static uint16_t cfg_mss; static int cfg_payload_len = (1472 * 42); static int cfg_port = 8000; static int cfg_runtime_ms = -1; static bool cfg_segment; static bool cfg_sendmmsg; static bool cfg_tcp; static bool cfg_zerocopy; static socklen_t cfg_alen; static struct sockaddr_storage cfg_dst_addr; static bool interrupted; static char buf[NUM_PKT][ETH_MAX_MTU]; static void sigint_handler(int signum) { if (signum == SIGINT) interrupted = true; } static unsigned long gettimeofday_ms(void) { struct timeval tv; gettimeofday(&tv, NULL); return (tv.tv_sec * 1000) + (tv.tv_usec / 1000); } static int set_cpu(int cpu) { cpu_set_t mask; CPU_ZERO(&mask); CPU_SET(cpu, &mask); if (sched_setaffinity(0, sizeof(mask), &mask)) error(1, 0, "setaffinity %d", cpu); return 0; } static void setup_sockaddr(int domain, const char *str_addr, void *sockaddr) { struct sockaddr_in6 *addr6 = (void *) sockaddr; struct sockaddr_in *addr4 = (void *) sockaddr; switch (domain) { case PF_INET: addr4->sin_family = AF_INET; addr4->sin_port = htons(cfg_port); if (inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1) error(1, 0, "ipv4 parse error: %s", str_addr); break; case PF_INET6: addr6->sin6_family = AF_INET6; addr6->sin6_port = htons(cfg_port); if (inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1) error(1, 0, "ipv6 parse error: %s", str_addr); break; default: error(1, 0, "illegal domain"); } } static void flush_zerocopy(int fd) { struct msghdr msg = {0}; /* flush */ int ret; while (1) { ret = recvmsg(fd, &msg, MSG_ERRQUEUE); if (ret == -1 && errno == EAGAIN) break; if (ret == -1) error(1, errno, "errqueue"); if (msg.msg_flags != (MSG_ERRQUEUE | MSG_CTRUNC)) error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags); msg.msg_flags = 0; } } static int send_tcp(int fd, char *data) { int ret, done = 0, count = 0; while (done < cfg_payload_len) { ret = send(fd, data + done, cfg_payload_len - done, cfg_zerocopy ? MSG_ZEROCOPY : 0); if (ret == -1) error(1, errno, "write"); done += ret; count++; } return count; } static int send_udp(int fd, char *data) { int ret, total_len, len, count = 0; total_len = cfg_payload_len; while (total_len) { len = total_len < cfg_mss ? total_len : cfg_mss; ret = sendto(fd, data, len, cfg_zerocopy ? MSG_ZEROCOPY : 0, cfg_connected ? NULL : (void *)&cfg_dst_addr, cfg_connected ? 0 : cfg_alen); if (ret == -1) error(1, errno, "write"); if (ret != len) error(1, errno, "write: %uB != %uB\n", ret, len); total_len -= len; count++; } return count; } static int send_udp_sendmmsg(int fd, char *data) { const int max_nr_msg = ETH_MAX_MTU / ETH_DATA_LEN; struct mmsghdr mmsgs[max_nr_msg]; struct iovec iov[max_nr_msg]; unsigned int off = 0, left; int i = 0, ret; memset(mmsgs, 0, sizeof(mmsgs)); left = cfg_payload_len; while (left) { if (i == max_nr_msg) error(1, 0, "sendmmsg: exceeds max_nr_msg"); iov[i].iov_base = data + off; iov[i].iov_len = cfg_mss < left ? cfg_mss : left; mmsgs[i].msg_hdr.msg_iov = iov + i; mmsgs[i].msg_hdr.msg_iovlen = 1; off += iov[i].iov_len; left -= iov[i].iov_len; i++; } ret = sendmmsg(fd, mmsgs, i, cfg_zerocopy ? MSG_ZEROCOPY : 0); if (ret == -1) error(1, errno, "sendmmsg"); return ret; } static void send_udp_segment_cmsg(struct cmsghdr *cm) { uint16_t *valp; cm->cmsg_level = SOL_UDP; cm->cmsg_type = UDP_SEGMENT; cm->cmsg_len = CMSG_LEN(sizeof(cfg_mss)); valp = (void *)CMSG_DATA(cm); *valp = cfg_mss; } static int send_udp_segment(int fd, char *data) { char control[CMSG_SPACE(sizeof(cfg_mss))] = {0}; struct msghdr msg = {0}; struct iovec iov = {0}; int ret; iov.iov_base = data; iov.iov_len = cfg_payload_len; msg.msg_iov = &iov; msg.msg_iovlen = 1; msg.msg_control = control; msg.msg_controllen = sizeof(control); send_udp_segment_cmsg(CMSG_FIRSTHDR(&msg)); msg.msg_name = (void *)&cfg_dst_addr; msg.msg_namelen = cfg_alen; ret = sendmsg(fd, &msg, cfg_zerocopy ? MSG_ZEROCOPY : 0); if (ret == -1) error(1, errno, "sendmsg"); if (ret != iov.iov_len) error(1, 0, "sendmsg: %u != %lu\n", ret, iov.iov_len); return 1; } static void usage(const char *filepath) { error(1, 0, "Usage: %s [-46cmStuz] [-C cpu] [-D dst ip] [-l secs] [-p port] [-s sendsize]", filepath); } static void parse_opts(int argc, char **argv) { int max_len, hdrlen; int c; while ((c = getopt(argc, argv, "46cC:D:l:mp:s:Stuz")) != -1) { switch (c) { case '4': if (cfg_family != PF_UNSPEC) error(1, 0, "Pass one of -4 or -6"); cfg_family = PF_INET; cfg_alen = sizeof(struct sockaddr_in); break; case '6': if (cfg_family != PF_UNSPEC) error(1, 0, "Pass one of -4 or -6"); cfg_family = PF_INET6; cfg_alen = sizeof(struct sockaddr_in6); break; case 'c': cfg_cache_trash = true; break; case 'C': cfg_cpu = strtol(optarg, NULL, 0); break; case 'D': setup_sockaddr(cfg_family, optarg, &cfg_dst_addr); break; case 'l': cfg_runtime_ms = strtoul(optarg, NULL, 10) * 1000; break; case 'm': cfg_sendmmsg = true; break; case 'p': cfg_port = strtoul(optarg, NULL, 0); break; case 's': cfg_payload_len = strtoul(optarg, NULL, 0); break; case 'S': cfg_segment = true; break; case 't': cfg_tcp = true; break; case 'u': cfg_connected = false; break; case 'z': cfg_zerocopy = true; break; } } if (optind != argc) usage(argv[0]); if (cfg_family == PF_UNSPEC) error(1, 0, "must pass one of -4 or -6"); if (cfg_tcp && !cfg_connected) error(1, 0, "connectionless tcp makes no sense"); if (cfg_segment && cfg_sendmmsg) error(1, 0, "cannot combine segment offload and sendmmsg"); if (cfg_family == PF_INET) hdrlen = sizeof(struct iphdr) + sizeof(struct udphdr); else hdrlen = sizeof(struct ip6_hdr) + sizeof(struct udphdr); cfg_mss = ETH_DATA_LEN - hdrlen; max_len = ETH_MAX_MTU - hdrlen; if (cfg_payload_len > max_len) error(1, 0, "payload length %u exceeds max %u", cfg_payload_len, max_len); } static void set_pmtu_discover(int fd, bool is_ipv4) { int level, name, val; if (is_ipv4) { level = SOL_IP; name = IP_MTU_DISCOVER; val = IP_PMTUDISC_DO; } else { level = SOL_IPV6; name = IPV6_MTU_DISCOVER; val = IPV6_PMTUDISC_DO; } if (setsockopt(fd, level, name, &val, sizeof(val))) error(1, errno, "setsockopt path mtu"); } int main(int argc, char **argv) { unsigned long num_msgs, num_sends; unsigned long tnow, treport, tstop; int fd, i, val; parse_opts(argc, argv); if (cfg_cpu > 0) set_cpu(cfg_cpu); for (i = 0; i < sizeof(buf[0]); i++) buf[0][i] = 'a' + (i % 26); for (i = 1; i < NUM_PKT; i++) memcpy(buf[i], buf[0], sizeof(buf[0])); signal(SIGINT, sigint_handler); fd = socket(cfg_family, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0); if (fd == -1) error(1, errno, "socket"); if (cfg_zerocopy) { val = 1; if (setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &val, sizeof(val))) error(1, errno, "setsockopt zerocopy"); } if (cfg_connected && connect(fd, (void *)&cfg_dst_addr, cfg_alen)) error(1, errno, "connect"); if (cfg_segment) set_pmtu_discover(fd, cfg_family == PF_INET); num_msgs = num_sends = 0; tnow = gettimeofday_ms(); tstop = tnow + cfg_runtime_ms; treport = tnow + 1000; i = 0; do { if (cfg_tcp) num_sends += send_tcp(fd, buf[i]); else if (cfg_segment) num_sends += send_udp_segment(fd, buf[i]); else if (cfg_sendmmsg) num_sends += send_udp_sendmmsg(fd, buf[i]); else num_sends += send_udp(fd, buf[i]); num_msgs++; if (cfg_zerocopy && ((num_msgs & 0xF) == 0)) flush_zerocopy(fd); tnow = gettimeofday_ms(); if (tnow > treport) { fprintf(stderr, "%s tx: %6lu MB/s %8lu calls/s %6lu msg/s\n", cfg_tcp ? "tcp" : "udp", (num_msgs * cfg_payload_len) >> 20, num_sends, num_msgs); num_msgs = num_sends = 0; treport = tnow + 1000; } /* cold cache when writing buffer */ if (cfg_cache_trash) i = ++i < NUM_PKT ? i : 0; } while (!interrupted && (cfg_runtime_ms == -1 || tnow < tstop)); if (close(fd)) error(1, errno, "close"); return 0; } |