samples/bpf/xdpsock_user.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2017 - 2018 Intel Corporation. */
   3
   4 #include <asm/barrier.h>
   5 #include <errno.h>
   6 #include <getopt.h>
   7 #include <libgen.h>
   8 #include <linux/bpf.h>
   9 #include <linux/compiler.h>
  10 #include <linux/if_link.h>
  11 #include <linux/if_xdp.h>
  12 #include <linux/if_ether.h>
  13 #include <locale.h>
  14 #include <net/ethernet.h>
  15 #include <net/if.h>
  16 #include <poll.h>
  17 #include <pthread.h>
  18 #include <signal.h>
  19 #include <stdbool.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/mman.h>
  24 #include <sys/resource.h>
  25 #include <sys/socket.h>
  26 #include <sys/types.h>
  27 #include <time.h>
  28 #include <unistd.h>
  29
  30 #include "bpf/libbpf.h"
  31 #include "bpf/xsk.h"
  32 #include <bpf/bpf.h>
  33
  34 #ifndef SOL_XDP
  35 #define SOL_XDP 283
  36 #endif
  37
  38 #ifndef AF_XDP
  39 #define AF_XDP 44
  40 #endif
  41
  42 #ifndef PF_XDP
  43 #define PF_XDP AF_XDP
  44 #endif
  45
  46 #define NUM_FRAMES (4 * 1024)
  47 #define BATCH_SIZE 64
  48
  49 #define DEBUG_HEXDUMP 0
  50 #define MAX_SOCKS 8
  51
  52 typedef __u64 u64;
  53 typedef __u32 u32;
  54
  55 static unsigned long prev_time;
  56
  57 enum benchmark_type {
  58         BENCH_RXDROP = 0,
  59         BENCH_TXONLY = 1,
  60         BENCH_L2FWD = 2,
  61 };
  62
  63 static enum benchmark_type opt_bench = BENCH_RXDROP;
  64 static u32 opt_xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
  65 static const char *opt_if = "";
  66 static int opt_ifindex;
  67 static int opt_queue;
  68 static int opt_poll;
  69 static int opt_interval = 1;
  70 static u32 opt_xdp_bind_flags;
  71 static __u32 prog_id;
  72
  73 struct xsk_umem_info {
  74         struct xsk_ring_prod fq;
  75         struct xsk_ring_cons cq;
  76         struct xsk_umem *umem;
  77         void *buffer;
  78 };
  79
  80 struct xsk_socket_info {
  81         struct xsk_ring_cons rx;
  82         struct xsk_ring_prod tx;
  83         struct xsk_umem_info *umem;
  84         struct xsk_socket *xsk;
  85         unsigned long rx_npkts;
  86         unsigned long tx_npkts;
  87         unsigned long prev_rx_npkts;
  88         unsigned long prev_tx_npkts;
  89         u32 outstanding_tx;
  90 };
  91
  92 static int num_socks;
  93 struct xsk_socket_info *xsks[MAX_SOCKS];
  94
  95 static unsigned long get_nsecs(void)
  96 {
  97         struct timespec ts;
  98
  99         clock_gettime(CLOCK_MONOTONIC, &ts);
 100         return ts.tv_sec * 1000000000UL + ts.tv_nsec;
 101 }
 102
 103 static void print_benchmark(bool running)
 104 {
 105         const char *bench_str = "INVALID";
 106
 107         if (opt_bench == BENCH_RXDROP)
 108                 bench_str = "rxdrop";
 109         else if (opt_bench == BENCH_TXONLY)
 110                 bench_str = "txonly";
 111         else if (opt_bench == BENCH_L2FWD)
 112                 bench_str = "l2fwd";
 113
 114         printf("%s:%d %s ", opt_if, opt_queue, bench_str);
 115         if (opt_xdp_flags & XDP_FLAGS_SKB_MODE)
 116                 printf("xdp-skb ");
 117         else if (opt_xdp_flags & XDP_FLAGS_DRV_MODE)
 118                 printf("xdp-drv ");
 119         else
 120                 printf("        ");
 121
 122         if (opt_poll)
 123                 printf("poll() ");
 124
 125         if (running) {
 126                 printf("running...");
 127                 fflush(stdout);
 128         }
 129 }
 130
 131 static void dump_stats(void)
 132 {
 133         unsigned long now = get_nsecs();
 134         long dt = now - prev_time;
 135         int i;
 136
 137         prev_time = now;
 138
 139         for (i = 0; i < num_socks && xsks[i]; i++) {
 140                 char *fmt = "%-15s %'-11.0f %'-11lu\n";
 141                 double rx_pps, tx_pps;
 142
 143                 rx_pps = (xsks[i]->rx_npkts - xsks[i]->prev_rx_npkts) *
 144                          1000000000. / dt;
 145                 tx_pps = (xsks[i]->tx_npkts - xsks[i]->prev_tx_npkts) *
 146                          1000000000. / dt;
 147
 148                 printf("\n sock%d@", i);
 149                 print_benchmark(false);
 150                 printf("\n");
 151
 152                 printf("%-15s %-11s %-11s %-11.2f\n", "", "pps", "pkts",
 153                        dt / 1000000000.);
 154                 printf(fmt, "rx", rx_pps, xsks[i]->rx_npkts);
 155                 printf(fmt, "tx", tx_pps, xsks[i]->tx_npkts);
 156
 157                 xsks[i]->prev_rx_npkts = xsks[i]->rx_npkts;
 158                 xsks[i]->prev_tx_npkts = xsks[i]->tx_npkts;
 159         }
 160 }
 161
 162 static void *poller(void *arg)
 163 {
 164         (void)arg;
 165         for (;;) {
 166                 sleep(opt_interval);
 167                 dump_stats();
 168         }
 169
 170         return NULL;
 171 }
 172
 173 static void remove_xdp_program(void)
 174 {
 175         __u32 curr_prog_id = 0;
 176
 177         if (bpf_get_link_xdp_id(opt_ifindex, &curr_prog_id, opt_xdp_flags)) {
 178                 printf("bpf_get_link_xdp_id failed\n");
 179                 exit(EXIT_FAILURE);
 180         }
 181         if (prog_id == curr_prog_id)
 182                 bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags);
 183         else if (!curr_prog_id)
 184                 printf("couldn't find a prog id on a given interface\n");
 185         else
 186                 printf("program on interface changed, not removing\n");
 187 }
 188
 189 static void int_exit(int sig)
 190 {
 191         struct xsk_umem *umem = xsks[0]->umem->umem;
 192
 193         (void)sig;
 194
 195         dump_stats();
 196         xsk_socket__delete(xsks[0]->xsk);
 197         (void)xsk_umem__delete(umem);
 198         remove_xdp_program();
 199
 200         exit(EXIT_SUCCESS);
 201 }
 202
 203 static void __exit_with_error(int error, const char *file, const char *func,
 204                               int line)
 205 {
 206         fprintf(stderr, "%s:%s:%i: errno: %d/\"%s\"\n", file, func,
 207                 line, error, strerror(error));
 208         dump_stats();
 209         remove_xdp_program();
 210         exit(EXIT_FAILURE);
 211 }
 212
 213 #define exit_with_error(error) __exit_with_error(error, __FILE__, __func__, \
 214                                                  __LINE__)
 215
 216 static const char pkt_data[] =
 217         "\x3c\xfd\xfe\x9e\x7f\x71\xec\xb1\xd7\x98\x3a\xc0\x08\x00\x45\x00"
 218         "\x00\x2e\x00\x00\x00\x00\x40\x11\x88\x97\x05\x08\x07\x08\xc8\x14"
 219         "\x1e\x04\x10\x92\x10\x92\x00\x1a\x6d\xa3\x34\x33\x1f\x69\x40\x6b"
 220         "\x54\x59\xb6\x14\x2d\x11\x44\xbf\xaf\xd9\xbe\xaa";
 221
 222 static void swap_mac_addresses(void *data)
 223 {
 224         struct ether_header *eth = (struct ether_header *)data;
 225         struct ether_addr *src_addr = (struct ether_addr *)&eth->ether_shost;
 226         struct ether_addr *dst_addr = (struct ether_addr *)&eth->ether_dhost;
 227         struct ether_addr tmp;
 228
 229         tmp = *src_addr;
 230         *src_addr = *dst_addr;
 231         *dst_addr = tmp;
 232 }
 233
 234 static void hex_dump(void *pkt, size_t length, u64 addr)
 235 {
 236         const unsigned char *address = (unsigned char *)pkt;
 237         const unsigned char *line = address;
 238         size_t line_size = 32;
 239         unsigned char c;
 240         char buf[32];
 241         int i = 0;
 242
 243         if (!DEBUG_HEXDUMP)
 244                 return;
 245
 246         sprintf(buf, "addr=%llu", addr);
 247         printf("length = %zu\n", length);
 248         printf("%s | ", buf);
 249         while (length-- > 0) {
 250                 printf("%02X ", *address++);
 251                 if (!(++i % line_size) || (length == 0 && i % line_size)) {
 252                         if (length == 0) {
 253                                 while (i++ % line_size)
 254                                         printf("__ ");
 255                         }
 256                         printf(" | ");  /* right close */
 257                         while (line < address) {
 258                                 c = *line++;
 259                                 printf("%c", (c < 33 || c == 255) ? 0x2E : c);
 260                         }
 261                         printf("\n");
 262                         if (length > 0)
 263                                 printf("%s | ", buf);
 264                 }
 265         }
 266         printf("\n");
 267 }
 268
 269 static size_t gen_eth_frame(struct xsk_umem_info *umem, u64 addr)
 270 {
 271         memcpy(xsk_umem__get_data(umem->buffer, addr), pkt_data,
 272                sizeof(pkt_data) - 1);
 273         return sizeof(pkt_data) - 1;
 274 }
 275
 276 static struct xsk_umem_info *xsk_configure_umem(void *buffer, u64 size)
 277 {
 278         struct xsk_umem_info *umem;
 279         int ret;
 280
 281         umem = calloc(1, sizeof(*umem));
 282         if (!umem)
 283                 exit_with_error(errno);
 284
 285         ret = xsk_umem__create(&umem->umem, buffer, size, &umem->fq, &umem->cq,
 286                                NULL);
 287         if (ret)
 288                 exit_with_error(-ret);
 289
 290         umem->buffer = buffer;
 291         return umem;
 292 }
 293
 294 static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem)
 295 {
 296         struct xsk_socket_config cfg;
 297         struct xsk_socket_info *xsk;
 298         int ret;
 299         u32 idx;
 300         int i;
 301
 302         xsk = calloc(1, sizeof(*xsk));
 303         if (!xsk)
 304                 exit_with_error(errno);
 305
 306         xsk->umem = umem;
 307         cfg.rx_size = XSK_RING_CONS__DEFAULT_NUM_DESCS;
 308         cfg.tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS;
 309         cfg.libbpf_flags = 0;
 310         cfg.xdp_flags = opt_xdp_flags;
 311         cfg.bind_flags = opt_xdp_bind_flags;
 312         ret = xsk_socket__create(&xsk->xsk, opt_if, opt_queue, umem->umem,
 313                                  &xsk->rx, &xsk->tx, &cfg);
 314         if (ret)
 315                 exit_with_error(-ret);
 316
 317         ret = bpf_get_link_xdp_id(opt_ifindex, &prog_id, opt_xdp_flags);
 318         if (ret)
 319                 exit_with_error(-ret);
 320
 321         ret = xsk_ring_prod__reserve(&xsk->umem->fq,
 322                                      XSK_RING_PROD__DEFAULT_NUM_DESCS,
 323                                      &idx);
 324         if (ret != XSK_RING_PROD__DEFAULT_NUM_DESCS)
 325                 exit_with_error(-ret);
 326         for (i = 0;
 327              i < XSK_RING_PROD__DEFAULT_NUM_DESCS *
 328                      XSK_UMEM__DEFAULT_FRAME_SIZE;
 329              i += XSK_UMEM__DEFAULT_FRAME_SIZE)
 330                 *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx++) = i;
 331         xsk_ring_prod__submit(&xsk->umem->fq,
 332                               XSK_RING_PROD__DEFAULT_NUM_DESCS);
 333
 334         return xsk;
 335 }
 336
 337 static struct option long_options[] = {
 338         {"rxdrop", no_argument, 0, 'r'},
 339         {"txonly", no_argument, 0, 't'},
 340         {"l2fwd", no_argument, 0, 'l'},
 341         {"interface", required_argument, 0, 'i'},
 342         {"queue", required_argument, 0, 'q'},
 343         {"poll", no_argument, 0, 'p'},
 344         {"xdp-skb", no_argument, 0, 'S'},
 345         {"xdp-native", no_argument, 0, 'N'},
 346         {"interval", required_argument, 0, 'n'},
 347         {"zero-copy", no_argument, 0, 'z'},
 348         {"copy", no_argument, 0, 'c'},
 349         {0, 0, 0, 0}
 350 };
 351
 352 static void usage(const char *prog)
 353 {
 354         const char *str =
 355                 "  Usage: %s [OPTIONS]\n"
 356                 "  Options:\n"
 357                 "  -r, --rxdrop         Discard all incoming packets (default)\n"
 358                 "  -t, --txonly         Only send packets\n"
 359                 "  -l, --l2fwd          MAC swap L2 forwarding\n"
 360                 "  -i, --interface=n    Run on interface n\n"
 361                 "  -q, --queue=n        Use queue n (default 0)\n"
 362                 "  -p, --poll           Use poll syscall\n"
 363                 "  -S, --xdp-skb=n      Use XDP skb-mod\n"
 364                 "  -N, --xdp-native=n   Enfore XDP native mode\n"
 365                 "  -n, --interval=n     Specify statistics update interval (default 1 sec).\n"
 366                 "  -z, --zero-copy      Force zero-copy mode.\n"
 367                 "  -c, --copy           Force copy mode.\n"
 368                 "\n";
 369         fprintf(stderr, str, prog);
 370         exit(EXIT_FAILURE);
 371 }
 372
 373 static void parse_command_line(int argc, char **argv)
 374 {
 375         int option_index, c;
 376
 377         opterr = 0;
 378
 379         for (;;) {
 380                 c = getopt_long(argc, argv, "Frtli:q:psSNn:cz", long_options,
 381                                 &option_index);
 382                 if (c == -1)
 383                         break;
 384
 385                 switch (c) {
 386                 case 'r':
 387                         opt_bench = BENCH_RXDROP;
 388                         break;
 389                 case 't':
 390                         opt_bench = BENCH_TXONLY;
 391                         break;
 392                 case 'l':
 393                         opt_bench = BENCH_L2FWD;
 394                         break;
 395                 case 'i':
 396                         opt_if = optarg;
 397                         break;
 398                 case 'q':
 399                         opt_queue = atoi(optarg);
 400                         break;
 401                 case 'p':
 402                         opt_poll = 1;
 403                         break;
 404                 case 'S':
 405                         opt_xdp_flags |= XDP_FLAGS_SKB_MODE;
 406                         opt_xdp_bind_flags |= XDP_COPY;
 407                         break;
 408                 case 'N':
 409                         opt_xdp_flags |= XDP_FLAGS_DRV_MODE;
 410                         break;
 411                 case 'n':
 412                         opt_interval = atoi(optarg);
 413                         break;
 414                 case 'z':
 415                         opt_xdp_bind_flags |= XDP_ZEROCOPY;
 416                         break;
 417                 case 'c':
 418                         opt_xdp_bind_flags |= XDP_COPY;
 419                         break;
 420                 case 'F':
 421                         opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
 422                         break;
 423                 default:
 424                         usage(basename(argv[0]));
 425                 }
 426         }
 427
 428         opt_ifindex = if_nametoindex(opt_if);
 429         if (!opt_ifindex) {
 430                 fprintf(stderr, "ERROR: interface \"%s\" does not exist\n",
 431                         opt_if);
 432                 usage(basename(argv[0]));
 433         }
 434
 435 }
 436
 437 static void kick_tx(struct xsk_socket_info *xsk)
 438 {
 439         int ret;
 440
 441         ret = sendto(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, 0);
 442         if (ret >= 0 || errno == ENOBUFS || errno == EAGAIN || errno == EBUSY)
 443                 return;
 444         exit_with_error(errno);
 445 }
 446
 447 static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk)
 448 {
 449         u32 idx_cq = 0, idx_fq = 0;
 450         unsigned int rcvd;
 451         size_t ndescs;
 452
 453         if (!xsk->outstanding_tx)
 454                 return;
 455
 456         kick_tx(xsk);
 457         ndescs = (xsk->outstanding_tx > BATCH_SIZE) ? BATCH_SIZE :
 458                 xsk->outstanding_tx;
 459
 460         /* re-add completed Tx buffers */
 461         rcvd = xsk_ring_cons__peek(&xsk->umem->cq, ndescs, &idx_cq);
 462         if (rcvd > 0) {
 463                 unsigned int i;
 464                 int ret;
 465
 466                 ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
 467                 while (ret != rcvd) {
 468                         if (ret < 0)
 469                                 exit_with_error(-ret);
 470                         ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd,
 471                                                      &idx_fq);
 472                 }
 473                 for (i = 0; i < rcvd; i++)
 474                         *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx_fq++) =
 475                                 *xsk_ring_cons__comp_addr(&xsk->umem->cq,
 476                                                           idx_cq++);
 477
 478                 xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
 479                 xsk_ring_cons__release(&xsk->umem->cq, rcvd);
 480                 xsk->outstanding_tx -= rcvd;
 481                 xsk->tx_npkts += rcvd;
 482         }
 483 }
 484
 485 static inline void complete_tx_only(struct xsk_socket_info *xsk)
 486 {
 487         unsigned int rcvd;
 488         u32 idx;
 489
 490         if (!xsk->outstanding_tx)
 491                 return;
 492
 493         kick_tx(xsk);
 494
 495         rcvd = xsk_ring_cons__peek(&xsk->umem->cq, BATCH_SIZE, &idx);
 496         if (rcvd > 0) {
 497                 xsk_ring_cons__release(&xsk->umem->cq, rcvd);
 498                 xsk->outstanding_tx -= rcvd;
 499                 xsk->tx_npkts += rcvd;
 500         }
 501 }
 502
 503 static void rx_drop(struct xsk_socket_info *xsk)
 504 {
 505         unsigned int rcvd, i;
 506         u32 idx_rx = 0, idx_fq = 0;
 507         int ret;
 508
 509         rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
 510         if (!rcvd)
 511                 return;
 512
 513         ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
 514         while (ret != rcvd) {
 515                 if (ret < 0)
 516                         exit_with_error(-ret);
 517                 ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
 518         }
 519
 520         for (i = 0; i < rcvd; i++) {
 521                 u64 addr = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx)->addr;
 522                 u32 len = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx++)->len;
 523                 char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);
 524
 525                 hex_dump(pkt, len, addr);
 526                 *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx_fq++) = addr;
 527         }
 528
 529         xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
 530         xsk_ring_cons__release(&xsk->rx, rcvd);
 531         xsk->rx_npkts += rcvd;
 532 }
 533
 534 static void rx_drop_all(void)
 535 {
 536         struct pollfd fds[MAX_SOCKS + 1];
 537         int i, ret, timeout, nfds = 1;
 538
 539         memset(fds, 0, sizeof(fds));
 540
 541         for (i = 0; i < num_socks; i++) {
 542                 fds[i].fd = xsk_socket__fd(xsks[i]->xsk);
 543                 fds[i].events = POLLIN;
 544                 timeout = 1000; /* 1sn */
 545         }
 546
 547         for (;;) {
 548                 if (opt_poll) {
 549                         ret = poll(fds, nfds, timeout);
 550                         if (ret <= 0)
 551                                 continue;
 552                 }
 553
 554                 for (i = 0; i < num_socks; i++)
 555                         rx_drop(xsks[i]);
 556         }
 557 }
 558
 559 static void tx_only(struct xsk_socket_info *xsk)
 560 {
 561         int timeout, ret, nfds = 1;
 562         struct pollfd fds[nfds + 1];
 563         u32 idx, frame_nb = 0;
 564
 565         memset(fds, 0, sizeof(fds));
 566         fds[0].fd = xsk_socket__fd(xsk->xsk);
 567         fds[0].events = POLLOUT;
 568         timeout = 1000; /* 1sn */
 569
 570         for (;;) {
 571                 if (opt_poll) {
 572                         ret = poll(fds, nfds, timeout);
 573                         if (ret <= 0)
 574                                 continue;
 575
 576                         if (!(fds[0].revents & POLLOUT))
 577                                 continue;
 578                 }
 579
 580                 if (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) ==
 581                     BATCH_SIZE) {
 582                         unsigned int i;
 583
 584                         for (i = 0; i < BATCH_SIZE; i++) {
 585                                 xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->addr
 586                                         = (frame_nb + i) <<
 587                                         XSK_UMEM__DEFAULT_FRAME_SHIFT;
 588                                 xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->len =
 589                                         sizeof(pkt_data) - 1;
 590                         }
 591
 592                         xsk_ring_prod__submit(&xsk->tx, BATCH_SIZE);
 593                         xsk->outstanding_tx += BATCH_SIZE;
 594                         frame_nb += BATCH_SIZE;
 595                         frame_nb %= NUM_FRAMES;
 596                 }
 597
 598                 complete_tx_only(xsk);
 599         }
 600 }
 601
 602 static void l2fwd(struct xsk_socket_info *xsk)
 603 {
 604         for (;;) {
 605                 unsigned int rcvd, i;
 606                 u32 idx_rx = 0, idx_tx = 0;
 607                 int ret;
 608
 609                 for (;;) {
 610                         complete_tx_l2fwd(xsk);
 611
 612                         rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE,
 613                                                    &idx_rx);
 614                         if (rcvd > 0)
 615                                 break;
 616                 }
 617
 618                 ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
 619                 while (ret != rcvd) {
 620                         if (ret < 0)
 621                                 exit_with_error(-ret);
 622                         ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
 623                 }
 624
 625                 for (i = 0; i < rcvd; i++) {
 626                         u64 addr = xsk_ring_cons__rx_desc(&xsk->rx,
 627                                                           idx_rx)->addr;
 628                         u32 len = xsk_ring_cons__rx_desc(&xsk->rx,
 629                                                          idx_rx++)->len;
 630                         char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);
 631
 632                         swap_mac_addresses(pkt);
 633
 634                         hex_dump(pkt, len, addr);
 635                         xsk_ring_prod__tx_desc(&xsk->tx, idx_tx)->addr = addr;
 636                         xsk_ring_prod__tx_desc(&xsk->tx, idx_tx++)->len = len;
 637                 }
 638
 639                 xsk_ring_prod__submit(&xsk->tx, rcvd);
 640                 xsk_ring_cons__release(&xsk->rx, rcvd);
 641
 642                 xsk->rx_npkts += rcvd;
 643                 xsk->outstanding_tx += rcvd;
 644         }
 645 }
 646
 647 int main(int argc, char **argv)
 648 {
 649         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 650         struct xsk_umem_info *umem;
 651         pthread_t pt;
 652         void *bufs;
 653         int ret;
 654
 655         parse_command_line(argc, argv);
 656
 657         if (setrlimit(RLIMIT_MEMLOCK, &r)) {
 658                 fprintf(stderr, "ERROR: setrlimit(RLIMIT_MEMLOCK) \"%s\"\n",
 659                         strerror(errno));
 660                 exit(EXIT_FAILURE);
 661         }
 662
 663         ret = posix_memalign(&bufs, getpagesize(), /* PAGE_SIZE aligned */
 664                              NUM_FRAMES * XSK_UMEM__DEFAULT_FRAME_SIZE);
 665         if (ret)
 666                 exit_with_error(ret);
 667
 668        /* Create sockets... */
 669         umem = xsk_configure_umem(bufs,
 670                                   NUM_FRAMES * XSK_UMEM__DEFAULT_FRAME_SIZE);
 671         xsks[num_socks++] = xsk_configure_socket(umem);
 672
 673         if (opt_bench == BENCH_TXONLY) {
 674                 int i;
 675
 676                 for (i = 0; i < NUM_FRAMES * XSK_UMEM__DEFAULT_FRAME_SIZE;
 677                      i += XSK_UMEM__DEFAULT_FRAME_SIZE)
 678                         (void)gen_eth_frame(umem, i);
 679         }
 680
 681         signal(SIGINT, int_exit);
 682         signal(SIGTERM, int_exit);
 683         signal(SIGABRT, int_exit);
 684
 685         setlocale(LC_ALL, "");
 686
 687         ret = pthread_create(&pt, NULL, poller, NULL);
 688         if (ret)
 689                 exit_with_error(ret);
 690
 691         prev_time = get_nsecs();
 692
 693         if (opt_bench == BENCH_RXDROP)
 694                 rx_drop_all();
 695         else if (opt_bench == BENCH_TXONLY)
 696                 tx_only(xsks[0]);
 697         else
 698                 l2fwd(xsks[0]);
 699
 700         return 0;
 701 }