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 "libbpf.h"
  31 #include "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 int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
  72 static __u32 prog_id;
  73
  74 struct xsk_umem_info {
  75         struct xsk_ring_prod fq;
  76         struct xsk_ring_cons cq;
  77         struct xsk_umem *umem;
  78         void *buffer;
  79 };
  80
  81 struct xsk_socket_info {
  82         struct xsk_ring_cons rx;
  83         struct xsk_ring_prod tx;
  84         struct xsk_umem_info *umem;
  85         struct xsk_socket *xsk;
  86         unsigned long rx_npkts;
  87         unsigned long tx_npkts;
  88         unsigned long prev_rx_npkts;
  89         unsigned long prev_tx_npkts;
  90         u32 outstanding_tx;
  91 };
  92
  93 static int num_socks;
  94 struct xsk_socket_info *xsks[MAX_SOCKS];
  95
  96 static unsigned long get_nsecs(void)
  97 {
  98         struct timespec ts;
  99
 100         clock_gettime(CLOCK_MONOTONIC, &ts);
 101         return ts.tv_sec * 1000000000UL + ts.tv_nsec;
 102 }
 103
 104 static void print_benchmark(bool running)
 105 {
 106         const char *bench_str = "INVALID";
 107
 108         if (opt_bench == BENCH_RXDROP)
 109                 bench_str = "rxdrop";
 110         else if (opt_bench == BENCH_TXONLY)
 111                 bench_str = "txonly";
 112         else if (opt_bench == BENCH_L2FWD)
 113                 bench_str = "l2fwd";
 114
 115         printf("%s:%d %s ", opt_if, opt_queue, bench_str);
 116         if (opt_xdp_flags & XDP_FLAGS_SKB_MODE)
 117                 printf("xdp-skb ");
 118         else if (opt_xdp_flags & XDP_FLAGS_DRV_MODE)
 119                 printf("xdp-drv ");
 120         else
 121                 printf("        ");
 122
 123         if (opt_poll)
 124                 printf("poll() ");
 125
 126         if (running) {
 127                 printf("running...");
 128                 fflush(stdout);
 129         }
 130 }
 131
 132 static void dump_stats(void)
 133 {
 134         unsigned long now = get_nsecs();
 135         long dt = now - prev_time;
 136         int i;
 137
 138         prev_time = now;
 139
 140         for (i = 0; i < num_socks && xsks[i]; i++) {
 141                 char *fmt = "%-15s %'-11.0f %'-11lu\n";
 142                 double rx_pps, tx_pps;
 143
 144                 rx_pps = (xsks[i]->rx_npkts - xsks[i]->prev_rx_npkts) *
 145                          1000000000. / dt;
 146                 tx_pps = (xsks[i]->tx_npkts - xsks[i]->prev_tx_npkts) *
 147                          1000000000. / dt;
 148
 149                 printf("\n sock%d@", i);
 150                 print_benchmark(false);
 151                 printf("\n");
 152
 153                 printf("%-15s %-11s %-11s %-11.2f\n", "", "pps", "pkts",
 154                        dt / 1000000000.);
 155                 printf(fmt, "rx", rx_pps, xsks[i]->rx_npkts);
 156                 printf(fmt, "tx", tx_pps, xsks[i]->tx_npkts);
 157
 158                 xsks[i]->prev_rx_npkts = xsks[i]->rx_npkts;
 159                 xsks[i]->prev_tx_npkts = xsks[i]->tx_npkts;
 160         }
 161 }
 162
 163 static void *poller(void *arg)
 164 {
 165         (void)arg;
 166         for (;;) {
 167                 sleep(opt_interval);
 168                 dump_stats();
 169         }
 170
 171         return NULL;
 172 }
 173
 174 static void remove_xdp_program(void)
 175 {
 176         __u32 curr_prog_id = 0;
 177
 178         if (bpf_get_link_xdp_id(opt_ifindex, &curr_prog_id, opt_xdp_flags)) {
 179                 printf("bpf_get_link_xdp_id failed\n");
 180                 exit(EXIT_FAILURE);
 181         }
 182         if (prog_id == curr_prog_id)
 183                 bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags);
 184         else if (!curr_prog_id)
 185                 printf("couldn't find a prog id on a given interface\n");
 186         else
 187                 printf("program on interface changed, not removing\n");
 188 }
 189
 190 static void int_exit(int sig)
 191 {
 192         struct xsk_umem *umem = xsks[0]->umem->umem;
 193
 194         (void)sig;
 195
 196         dump_stats();
 197         xsk_socket__delete(xsks[0]->xsk);
 198         (void)xsk_umem__delete(umem);
 199         remove_xdp_program();
 200
 201         exit(EXIT_SUCCESS);
 202 }
 203
 204 static void __exit_with_error(int error, const char *file, const char *func,
 205                               int line)
 206 {
 207         fprintf(stderr, "%s:%s:%i: errno: %d/\"%s\"\n", file, func,
 208                 line, error, strerror(error));
 209         dump_stats();
 210         remove_xdp_program();
 211         exit(EXIT_FAILURE);
 212 }
 213
 214 #define exit_with_error(error) __exit_with_error(error, __FILE__, __func__, \
 215                                                  __LINE__)
 216
 217 static const char pkt_data[] =
 218         "\x3c\xfd\xfe\x9e\x7f\x71\xec\xb1\xd7\x98\x3a\xc0\x08\x00\x45\x00"
 219         "\x00\x2e\x00\x00\x00\x00\x40\x11\x88\x97\x05\x08\x07\x08\xc8\x14"
 220         "\x1e\x04\x10\x92\x10\x92\x00\x1a\x6d\xa3\x34\x33\x1f\x69\x40\x6b"
 221         "\x54\x59\xb6\x14\x2d\x11\x44\xbf\xaf\xd9\xbe\xaa";
 222
 223 static void swap_mac_addresses(void *data)
 224 {
 225         struct ether_header *eth = (struct ether_header *)data;
 226         struct ether_addr *src_addr = (struct ether_addr *)&eth->ether_shost;
 227         struct ether_addr *dst_addr = (struct ether_addr *)&eth->ether_dhost;
 228         struct ether_addr tmp;
 229
 230         tmp = *src_addr;
 231         *src_addr = *dst_addr;
 232         *dst_addr = tmp;
 233 }
 234
 235 static void hex_dump(void *pkt, size_t length, u64 addr)
 236 {
 237         const unsigned char *address = (unsigned char *)pkt;
 238         const unsigned char *line = address;
 239         size_t line_size = 32;
 240         unsigned char c;
 241         char buf[32];
 242         int i = 0;
 243
 244         if (!DEBUG_HEXDUMP)
 245                 return;
 246
 247         sprintf(buf, "addr=%llu", addr);
 248         printf("length = %zu\n", length);
 249         printf("%s | ", buf);
 250         while (length-- > 0) {
 251                 printf("%02X ", *address++);
 252                 if (!(++i % line_size) || (length == 0 && i % line_size)) {
 253                         if (length == 0) {
 254                                 while (i++ % line_size)
 255                                         printf("__ ");
 256                         }
 257                         printf(" | ");  /* right close */
 258                         while (line < address) {
 259                                 c = *line++;
 260                                 printf("%c", (c < 33 || c == 255) ? 0x2E : c);
 261                         }
 262                         printf("\n");
 263                         if (length > 0)
 264                                 printf("%s | ", buf);
 265                 }
 266         }
 267         printf("\n");
 268 }
 269
 270 static size_t gen_eth_frame(struct xsk_umem_info *umem, u64 addr)
 271 {
 272         memcpy(xsk_umem__get_data(umem->buffer, addr), pkt_data,
 273                sizeof(pkt_data) - 1);
 274         return sizeof(pkt_data) - 1;
 275 }
 276
 277 static struct xsk_umem_info *xsk_configure_umem(void *buffer, u64 size)
 278 {
 279         struct xsk_umem_info *umem;
 280         struct xsk_umem_config cfg = {
 281                 .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
 282                 .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
 283                 .frame_size = opt_xsk_frame_size,
 284                 .frame_headroom = XSK_UMEM__DEFAULT_FRAME_HEADROOM,
 285         };
 286         int ret;
 287
 288         umem = calloc(1, sizeof(*umem));
 289         if (!umem)
 290                 exit_with_error(errno);
 291
 292         ret = xsk_umem__create(&umem->umem, buffer, size, &umem->fq, &umem->cq,
 293                                &cfg);
 294         if (ret)
 295                 exit_with_error(-ret);
 296
 297         umem->buffer = buffer;
 298         return umem;
 299 }
 300
 301 static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem)
 302 {
 303         struct xsk_socket_config cfg;
 304         struct xsk_socket_info *xsk;
 305         int ret;
 306         u32 idx;
 307         int i;
 308
 309         xsk = calloc(1, sizeof(*xsk));
 310         if (!xsk)
 311                 exit_with_error(errno);
 312
 313         xsk->umem = umem;
 314         cfg.rx_size = XSK_RING_CONS__DEFAULT_NUM_DESCS;
 315         cfg.tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS;
 316         cfg.libbpf_flags = 0;
 317         cfg.xdp_flags = opt_xdp_flags;
 318         cfg.bind_flags = opt_xdp_bind_flags;
 319         ret = xsk_socket__create(&xsk->xsk, opt_if, opt_queue, umem->umem,
 320                                  &xsk->rx, &xsk->tx, &cfg);
 321         if (ret)
 322                 exit_with_error(-ret);
 323
 324         ret = bpf_get_link_xdp_id(opt_ifindex, &prog_id, opt_xdp_flags);
 325         if (ret)
 326                 exit_with_error(-ret);
 327
 328         ret = xsk_ring_prod__reserve(&xsk->umem->fq,
 329                                      XSK_RING_PROD__DEFAULT_NUM_DESCS,
 330                                      &idx);
 331         if (ret != XSK_RING_PROD__DEFAULT_NUM_DESCS)
 332                 exit_with_error(-ret);
 333         for (i = 0; i < XSK_RING_PROD__DEFAULT_NUM_DESCS; i++)
 334                 *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx++) =
 335                         i * opt_xsk_frame_size;
 336         xsk_ring_prod__submit(&xsk->umem->fq,
 337                               XSK_RING_PROD__DEFAULT_NUM_DESCS);
 338
 339         return xsk;
 340 }
 341
 342 static struct option long_options[] = {
 343         {"rxdrop", no_argument, 0, 'r'},
 344         {"txonly", no_argument, 0, 't'},
 345         {"l2fwd", no_argument, 0, 'l'},
 346         {"interface", required_argument, 0, 'i'},
 347         {"queue", required_argument, 0, 'q'},
 348         {"poll", no_argument, 0, 'p'},
 349         {"xdp-skb", no_argument, 0, 'S'},
 350         {"xdp-native", no_argument, 0, 'N'},
 351         {"interval", required_argument, 0, 'n'},
 352         {"zero-copy", no_argument, 0, 'z'},
 353         {"copy", no_argument, 0, 'c'},
 354         {"frame-size", required_argument, 0, 'f'},
 355         {0, 0, 0, 0}
 356 };
 357
 358 static void usage(const char *prog)
 359 {
 360         const char *str =
 361                 "  Usage: %s [OPTIONS]\n"
 362                 "  Options:\n"
 363                 "  -r, --rxdrop         Discard all incoming packets (default)\n"
 364                 "  -t, --txonly         Only send packets\n"
 365                 "  -l, --l2fwd          MAC swap L2 forwarding\n"
 366                 "  -i, --interface=n    Run on interface n\n"
 367                 "  -q, --queue=n        Use queue n (default 0)\n"
 368                 "  -p, --poll           Use poll syscall\n"
 369                 "  -S, --xdp-skb=n      Use XDP skb-mod\n"
 370                 "  -N, --xdp-native=n   Enfore XDP native mode\n"
 371                 "  -n, --interval=n     Specify statistics update interval (default 1 sec).\n"
 372                 "  -z, --zero-copy      Force zero-copy mode.\n"
 373                 "  -c, --copy           Force copy mode.\n"
 374                 "  -f, --frame-size=n   Set the frame size (must be a power of two, default is %d).\n"
 375                 "\n";
 376         fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE);
 377         exit(EXIT_FAILURE);
 378 }
 379
 380 static void parse_command_line(int argc, char **argv)
 381 {
 382         int option_index, c;
 383
 384         opterr = 0;
 385
 386         for (;;) {
 387                 c = getopt_long(argc, argv, "Frtli:q:psSNn:czf:", long_options,
 388                                 &option_index);
 389                 if (c == -1)
 390                         break;
 391
 392                 switch (c) {
 393                 case 'r':
 394                         opt_bench = BENCH_RXDROP;
 395                         break;
 396                 case 't':
 397                         opt_bench = BENCH_TXONLY;
 398                         break;
 399                 case 'l':
 400                         opt_bench = BENCH_L2FWD;
 401                         break;
 402                 case 'i':
 403                         opt_if = optarg;
 404                         break;
 405                 case 'q':
 406                         opt_queue = atoi(optarg);
 407                         break;
 408                 case 'p':
 409                         opt_poll = 1;
 410                         break;
 411                 case 'S':
 412                         opt_xdp_flags |= XDP_FLAGS_SKB_MODE;
 413                         opt_xdp_bind_flags |= XDP_COPY;
 414                         break;
 415                 case 'N':
 416                         opt_xdp_flags |= XDP_FLAGS_DRV_MODE;
 417                         break;
 418                 case 'n':
 419                         opt_interval = atoi(optarg);
 420                         break;
 421                 case 'z':
 422                         opt_xdp_bind_flags |= XDP_ZEROCOPY;
 423                         break;
 424                 case 'c':
 425                         opt_xdp_bind_flags |= XDP_COPY;
 426                         break;
 427                 case 'F':
 428                         opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
 429                         break;
 430                 case 'f':
 431                         opt_xsk_frame_size = atoi(optarg);
 432                         break;
 433                 default:
 434                         usage(basename(argv[0]));
 435                 }
 436         }
 437
 438         opt_ifindex = if_nametoindex(opt_if);
 439         if (!opt_ifindex) {
 440                 fprintf(stderr, "ERROR: interface \"%s\" does not exist\n",
 441                         opt_if);
 442                 usage(basename(argv[0]));
 443         }
 444
 445         if (opt_xsk_frame_size & (opt_xsk_frame_size - 1)) {
 446                 fprintf(stderr, "--frame-size=%d is not a power of two\n",
 447                         opt_xsk_frame_size);
 448                 usage(basename(argv[0]));
 449         }
 450 }
 451
 452 static void kick_tx(struct xsk_socket_info *xsk)
 453 {
 454         int ret;
 455
 456         ret = sendto(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, 0);
 457         if (ret >= 0 || errno == ENOBUFS || errno == EAGAIN || errno == EBUSY)
 458                 return;
 459         exit_with_error(errno);
 460 }
 461
 462 static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk)
 463 {
 464         u32 idx_cq = 0, idx_fq = 0;
 465         unsigned int rcvd;
 466         size_t ndescs;
 467
 468         if (!xsk->outstanding_tx)
 469                 return;
 470
 471         kick_tx(xsk);
 472         ndescs = (xsk->outstanding_tx > BATCH_SIZE) ? BATCH_SIZE :
 473                 xsk->outstanding_tx;
 474
 475         /* re-add completed Tx buffers */
 476         rcvd = xsk_ring_cons__peek(&xsk->umem->cq, ndescs, &idx_cq);
 477         if (rcvd > 0) {
 478                 unsigned int i;
 479                 int ret;
 480
 481                 ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
 482                 while (ret != rcvd) {
 483                         if (ret < 0)
 484                                 exit_with_error(-ret);
 485                         ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd,
 486                                                      &idx_fq);
 487                 }
 488                 for (i = 0; i < rcvd; i++)
 489                         *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx_fq++) =
 490                                 *xsk_ring_cons__comp_addr(&xsk->umem->cq,
 491                                                           idx_cq++);
 492
 493                 xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
 494                 xsk_ring_cons__release(&xsk->umem->cq, rcvd);
 495                 xsk->outstanding_tx -= rcvd;
 496                 xsk->tx_npkts += rcvd;
 497         }
 498 }
 499
 500 static inline void complete_tx_only(struct xsk_socket_info *xsk)
 501 {
 502         unsigned int rcvd;
 503         u32 idx;
 504
 505         if (!xsk->outstanding_tx)
 506                 return;
 507
 508         kick_tx(xsk);
 509
 510         rcvd = xsk_ring_cons__peek(&xsk->umem->cq, BATCH_SIZE, &idx);
 511         if (rcvd > 0) {
 512                 xsk_ring_cons__release(&xsk->umem->cq, rcvd);
 513                 xsk->outstanding_tx -= rcvd;
 514                 xsk->tx_npkts += rcvd;
 515         }
 516 }
 517
 518 static void rx_drop(struct xsk_socket_info *xsk)
 519 {
 520         unsigned int rcvd, i;
 521         u32 idx_rx = 0, idx_fq = 0;
 522         int ret;
 523
 524         rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
 525         if (!rcvd)
 526                 return;
 527
 528         ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
 529         while (ret != rcvd) {
 530                 if (ret < 0)
 531                         exit_with_error(-ret);
 532                 ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
 533         }
 534
 535         for (i = 0; i < rcvd; i++) {
 536                 u64 addr = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx)->addr;
 537                 u32 len = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx++)->len;
 538                 char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);
 539
 540                 hex_dump(pkt, len, addr);
 541                 *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx_fq++) = addr;
 542         }
 543
 544         xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
 545         xsk_ring_cons__release(&xsk->rx, rcvd);
 546         xsk->rx_npkts += rcvd;
 547 }
 548
 549 static void rx_drop_all(void)
 550 {
 551         struct pollfd fds[MAX_SOCKS + 1];
 552         int i, ret, timeout, nfds = 1;
 553
 554         memset(fds, 0, sizeof(fds));
 555
 556         for (i = 0; i < num_socks; i++) {
 557                 fds[i].fd = xsk_socket__fd(xsks[i]->xsk);
 558                 fds[i].events = POLLIN;
 559                 timeout = 1000; /* 1sn */
 560         }
 561
 562         for (;;) {
 563                 if (opt_poll) {
 564                         ret = poll(fds, nfds, timeout);
 565                         if (ret <= 0)
 566                                 continue;
 567                 }
 568
 569                 for (i = 0; i < num_socks; i++)
 570                         rx_drop(xsks[i]);
 571         }
 572 }
 573
 574 static void tx_only(struct xsk_socket_info *xsk)
 575 {
 576         int timeout, ret, nfds = 1;
 577         struct pollfd fds[nfds + 1];
 578         u32 idx, frame_nb = 0;
 579
 580         memset(fds, 0, sizeof(fds));
 581         fds[0].fd = xsk_socket__fd(xsk->xsk);
 582         fds[0].events = POLLOUT;
 583         timeout = 1000; /* 1sn */
 584
 585         for (;;) {
 586                 if (opt_poll) {
 587                         ret = poll(fds, nfds, timeout);
 588                         if (ret <= 0)
 589                                 continue;
 590
 591                         if (!(fds[0].revents & POLLOUT))
 592                                 continue;
 593                 }
 594
 595                 if (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) ==
 596                     BATCH_SIZE) {
 597                         unsigned int i;
 598
 599                         for (i = 0; i < BATCH_SIZE; i++) {
 600                                 xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->addr
 601                                         = (frame_nb + i) * opt_xsk_frame_size;
 602                                 xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->len =
 603                                         sizeof(pkt_data) - 1;
 604                         }
 605
 606                         xsk_ring_prod__submit(&xsk->tx, BATCH_SIZE);
 607                         xsk->outstanding_tx += BATCH_SIZE;
 608                         frame_nb += BATCH_SIZE;
 609                         frame_nb %= NUM_FRAMES;
 610                 }
 611
 612                 complete_tx_only(xsk);
 613         }
 614 }
 615
 616 static void l2fwd(struct xsk_socket_info *xsk)
 617 {
 618         for (;;) {
 619                 unsigned int rcvd, i;
 620                 u32 idx_rx = 0, idx_tx = 0;
 621                 int ret;
 622
 623                 for (;;) {
 624                         complete_tx_l2fwd(xsk);
 625
 626                         rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE,
 627                                                    &idx_rx);
 628                         if (rcvd > 0)
 629                                 break;
 630                 }
 631
 632                 ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
 633                 while (ret != rcvd) {
 634                         if (ret < 0)
 635                                 exit_with_error(-ret);
 636                         ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
 637                 }
 638
 639                 for (i = 0; i < rcvd; i++) {
 640                         u64 addr = xsk_ring_cons__rx_desc(&xsk->rx,
 641                                                           idx_rx)->addr;
 642                         u32 len = xsk_ring_cons__rx_desc(&xsk->rx,
 643                                                          idx_rx++)->len;
 644                         char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);
 645
 646                         swap_mac_addresses(pkt);
 647
 648                         hex_dump(pkt, len, addr);
 649                         xsk_ring_prod__tx_desc(&xsk->tx, idx_tx)->addr = addr;
 650                         xsk_ring_prod__tx_desc(&xsk->tx, idx_tx++)->len = len;
 651                 }
 652
 653                 xsk_ring_prod__submit(&xsk->tx, rcvd);
 654                 xsk_ring_cons__release(&xsk->rx, rcvd);
 655
 656                 xsk->rx_npkts += rcvd;
 657                 xsk->outstanding_tx += rcvd;
 658         }
 659 }
 660
 661 int main(int argc, char **argv)
 662 {
 663         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 664         struct xsk_umem_info *umem;
 665         pthread_t pt;
 666         void *bufs;
 667         int ret;
 668
 669         parse_command_line(argc, argv);
 670
 671         if (setrlimit(RLIMIT_MEMLOCK, &r)) {
 672                 fprintf(stderr, "ERROR: setrlimit(RLIMIT_MEMLOCK) \"%s\"\n",
 673                         strerror(errno));
 674                 exit(EXIT_FAILURE);
 675         }
 676
 677         ret = posix_memalign(&bufs, getpagesize(), /* PAGE_SIZE aligned */
 678                              NUM_FRAMES * opt_xsk_frame_size);
 679         if (ret)
 680                 exit_with_error(ret);
 681
 682        /* Create sockets... */
 683         umem = xsk_configure_umem(bufs, NUM_FRAMES * opt_xsk_frame_size);
 684         xsks[num_socks++] = xsk_configure_socket(umem);
 685
 686         if (opt_bench == BENCH_TXONLY) {
 687                 int i;
 688
 689                 for (i = 0; i < NUM_FRAMES; i++)
 690                         (void)gen_eth_frame(umem, i * opt_xsk_frame_size);
 691         }
 692
 693         signal(SIGINT, int_exit);
 694         signal(SIGTERM, int_exit);
 695         signal(SIGABRT, int_exit);
 696
 697         setlocale(LC_ALL, "");
 698
 699         ret = pthread_create(&pt, NULL, poller, NULL);
 700         if (ret)
 701                 exit_with_error(ret);
 702
 703         prev_time = get_nsecs();
 704
 705         if (opt_bench == BENCH_RXDROP)
 706                 rx_drop_all();
 707         else if (opt_bench == BENCH_TXONLY)
 708                 tx_only(xsks[0]);
 709         else
 710                 l2fwd(xsks[0]);
 711
 712         return 0;
 713 }