drivers/net/af_packet/rte_eth_af_packet.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2014 John W. Linville <linville@tuxdriver.com>
   5  *
   6  *   Originally based upon librte_pmd_pcap code:
   7  *
   8  *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
   9  *   Copyright(c) 2014 6WIND S.A.
  10  *   All rights reserved.
  11  *
  12  *   Redistribution and use in source and binary forms, with or without
  13  *   modification, are permitted provided that the following conditions
  14  *   are met:
  15  *
  16  *     * Redistributions of source code must retain the above copyright
  17  *       notice, this list of conditions and the following disclaimer.
  18  *     * Redistributions in binary form must reproduce the above copyright
  19  *       notice, this list of conditions and the following disclaimer in
  20  *       the documentation and/or other materials provided with the
  21  *       distribution.
  22  *     * Neither the name of Intel Corporation nor the names of its
  23  *       contributors may be used to endorse or promote products derived
  24  *       from this software without specific prior written permission.
  25  *
  26  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  27  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  28  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  29  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  30  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  31  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  32  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  33  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  34  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  35  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  36  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include <rte_mbuf.h>
  40 #include <rte_ethdev.h>
  41 #include <rte_malloc.h>
  42 #include <rte_kvargs.h>
  43 #include <rte_vdev.h>
  44
  45 #include <linux/if_ether.h>
  46 #include <linux/if_packet.h>
  47 #include <arpa/inet.h>
  48 #include <net/if.h>
  49 #include <sys/types.h>
  50 #include <sys/socket.h>
  51 #include <sys/ioctl.h>
  52 #include <sys/mman.h>
  53 #include <unistd.h>
  54 #include <poll.h>
  55
  56 #define ETH_AF_PACKET_IFACE_ARG         "iface"
  57 #define ETH_AF_PACKET_NUM_Q_ARG         "qpairs"
  58 #define ETH_AF_PACKET_BLOCKSIZE_ARG     "blocksz"
  59 #define ETH_AF_PACKET_FRAMESIZE_ARG     "framesz"
  60 #define ETH_AF_PACKET_FRAMECOUNT_ARG    "framecnt"
  61
  62 #define DFLT_BLOCK_SIZE         (1 << 12)
  63 #define DFLT_FRAME_SIZE         (1 << 11)
  64 #define DFLT_FRAME_COUNT        (1 << 9)
  65
  66 #define RTE_PMD_AF_PACKET_MAX_RINGS 16
  67
  68 struct pkt_rx_queue {
  69         int sockfd;
  70
  71         struct iovec *rd;
  72         uint8_t *map;
  73         unsigned int framecount;
  74         unsigned int framenum;
  75
  76         struct rte_mempool *mb_pool;
  77         uint8_t in_port;
  78
  79         volatile unsigned long rx_pkts;
  80         volatile unsigned long err_pkts;
  81         volatile unsigned long rx_bytes;
  82 };
  83
  84 struct pkt_tx_queue {
  85         int sockfd;
  86
  87         struct iovec *rd;
  88         uint8_t *map;
  89         unsigned int framecount;
  90         unsigned int framenum;
  91
  92         volatile unsigned long tx_pkts;
  93         volatile unsigned long err_pkts;
  94         volatile unsigned long tx_bytes;
  95 };
  96
  97 struct pmd_internals {
  98         unsigned nb_queues;
  99
 100         int if_index;
 101         struct ether_addr eth_addr;
 102
 103         struct tpacket_req req;
 104
 105         struct pkt_rx_queue rx_queue[RTE_PMD_AF_PACKET_MAX_RINGS];
 106         struct pkt_tx_queue tx_queue[RTE_PMD_AF_PACKET_MAX_RINGS];
 107 };
 108
 109 static const char *valid_arguments[] = {
 110         ETH_AF_PACKET_IFACE_ARG,
 111         ETH_AF_PACKET_NUM_Q_ARG,
 112         ETH_AF_PACKET_BLOCKSIZE_ARG,
 113         ETH_AF_PACKET_FRAMESIZE_ARG,
 114         ETH_AF_PACKET_FRAMECOUNT_ARG,
 115         NULL
 116 };
 117
 118 static const char *drivername = "AF_PACKET PMD";
 119
 120 static struct rte_eth_link pmd_link = {
 121         .link_speed = ETH_SPEED_NUM_10G,
 122         .link_duplex = ETH_LINK_FULL_DUPLEX,
 123         .link_status = ETH_LINK_DOWN,
 124         .link_autoneg = ETH_LINK_SPEED_AUTONEG
 125 };
 126
 127 static uint16_t
 128 eth_af_packet_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 129 {
 130         unsigned i;
 131         struct tpacket2_hdr *ppd;
 132         struct rte_mbuf *mbuf;
 133         uint8_t *pbuf;
 134         struct pkt_rx_queue *pkt_q = queue;
 135         uint16_t num_rx = 0;
 136         unsigned long num_rx_bytes = 0;
 137         unsigned int framecount, framenum;
 138
 139         if (unlikely(nb_pkts == 0))
 140                 return 0;
 141
 142         /*
 143          * Reads the given number of packets from the AF_PACKET socket one by
 144          * one and copies the packet data into a newly allocated mbuf.
 145          */
 146         framecount = pkt_q->framecount;
 147         framenum = pkt_q->framenum;
 148         for (i = 0; i < nb_pkts; i++) {
 149                 /* point at the next incoming frame */
 150                 ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base;
 151                 if ((ppd->tp_status & TP_STATUS_USER) == 0)
 152                         break;
 153
 154                 /* allocate the next mbuf */
 155                 mbuf = rte_pktmbuf_alloc(pkt_q->mb_pool);
 156                 if (unlikely(mbuf == NULL))
 157                         break;
 158
 159                 /* packet will fit in the mbuf, go ahead and receive it */
 160                 rte_pktmbuf_pkt_len(mbuf) = rte_pktmbuf_data_len(mbuf) = ppd->tp_snaplen;
 161                 pbuf = (uint8_t *) ppd + ppd->tp_mac;
 162                 memcpy(rte_pktmbuf_mtod(mbuf, void *), pbuf, rte_pktmbuf_data_len(mbuf));
 163
 164                 /* release incoming frame and advance ring buffer */
 165                 ppd->tp_status = TP_STATUS_KERNEL;
 166                 if (++framenum >= framecount)
 167                         framenum = 0;
 168                 mbuf->port = pkt_q->in_port;
 169
 170                 /* account for the receive frame */
 171                 bufs[i] = mbuf;
 172                 num_rx++;
 173                 num_rx_bytes += mbuf->pkt_len;
 174         }
 175         pkt_q->framenum = framenum;
 176         pkt_q->rx_pkts += num_rx;
 177         pkt_q->rx_bytes += num_rx_bytes;
 178         return num_rx;
 179 }
 180
 181 /*
 182  * Callback to handle sending packets through a real NIC.
 183  */
 184 static uint16_t
 185 eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 186 {
 187         struct tpacket2_hdr *ppd;
 188         struct rte_mbuf *mbuf;
 189         uint8_t *pbuf;
 190         unsigned int framecount, framenum;
 191         struct pollfd pfd;
 192         struct pkt_tx_queue *pkt_q = queue;
 193         uint16_t num_tx = 0;
 194         unsigned long num_tx_bytes = 0;
 195         int i;
 196
 197         if (unlikely(nb_pkts == 0))
 198                 return 0;
 199
 200         memset(&pfd, 0, sizeof(pfd));
 201         pfd.fd = pkt_q->sockfd;
 202         pfd.events = POLLOUT;
 203         pfd.revents = 0;
 204
 205         framecount = pkt_q->framecount;
 206         framenum = pkt_q->framenum;
 207         ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base;
 208         for (i = 0; i < nb_pkts; i++) {
 209                 /* point at the next incoming frame */
 210                 if ((ppd->tp_status != TP_STATUS_AVAILABLE) &&
 211                     (poll(&pfd, 1, -1) < 0))
 212                                 continue;
 213
 214                 /* copy the tx frame data */
 215                 mbuf = bufs[num_tx];
 216                 pbuf = (uint8_t *) ppd + TPACKET2_HDRLEN -
 217                         sizeof(struct sockaddr_ll);
 218                 memcpy(pbuf, rte_pktmbuf_mtod(mbuf, void*), rte_pktmbuf_data_len(mbuf));
 219                 ppd->tp_len = ppd->tp_snaplen = rte_pktmbuf_data_len(mbuf);
 220
 221                 /* release incoming frame and advance ring buffer */
 222                 ppd->tp_status = TP_STATUS_SEND_REQUEST;
 223                 if (++framenum >= framecount)
 224                         framenum = 0;
 225                 ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base;
 226
 227                 num_tx++;
 228                 num_tx_bytes += mbuf->pkt_len;
 229                 rte_pktmbuf_free(mbuf);
 230         }
 231
 232         /* kick-off transmits */
 233         if (sendto(pkt_q->sockfd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1)
 234                 return 0; /* error sending -- no packets transmitted */
 235
 236         pkt_q->framenum = framenum;
 237         pkt_q->tx_pkts += num_tx;
 238         pkt_q->err_pkts += nb_pkts - num_tx;
 239         pkt_q->tx_bytes += num_tx_bytes;
 240         return num_tx;
 241 }
 242
 243 static int
 244 eth_dev_start(struct rte_eth_dev *dev)
 245 {
 246         dev->data->dev_link.link_status = ETH_LINK_UP;
 247         return 0;
 248 }
 249
 250 /*
 251  * This function gets called when the current port gets stopped.
 252  */
 253 static void
 254 eth_dev_stop(struct rte_eth_dev *dev)
 255 {
 256         unsigned i;
 257         int sockfd;
 258         struct pmd_internals *internals = dev->data->dev_private;
 259
 260         for (i = 0; i < internals->nb_queues; i++) {
 261                 sockfd = internals->rx_queue[i].sockfd;
 262                 if (sockfd != -1)
 263                         close(sockfd);
 264                 sockfd = internals->tx_queue[i].sockfd;
 265                 if (sockfd != -1)
 266                         close(sockfd);
 267         }
 268
 269         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 270 }
 271
 272 static int
 273 eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
 274 {
 275         return 0;
 276 }
 277
 278 static void
 279 eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 280 {
 281         struct pmd_internals *internals = dev->data->dev_private;
 282
 283         dev_info->driver_name = drivername;
 284         dev_info->if_index = internals->if_index;
 285         dev_info->max_mac_addrs = 1;
 286         dev_info->max_rx_pktlen = (uint32_t)ETH_FRAME_LEN;
 287         dev_info->max_rx_queues = (uint16_t)internals->nb_queues;
 288         dev_info->max_tx_queues = (uint16_t)internals->nb_queues;
 289         dev_info->min_rx_bufsize = 0;
 290 }
 291
 292 static void
 293 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
 294 {
 295         unsigned i, imax;
 296         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 297         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 298         const struct pmd_internals *internal = dev->data->dev_private;
 299
 300         imax = (internal->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS ?
 301                 internal->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS);
 302         for (i = 0; i < imax; i++) {
 303                 igb_stats->q_ipackets[i] = internal->rx_queue[i].rx_pkts;
 304                 igb_stats->q_ibytes[i] = internal->rx_queue[i].rx_bytes;
 305                 rx_total += igb_stats->q_ipackets[i];
 306                 rx_bytes_total += igb_stats->q_ibytes[i];
 307         }
 308
 309         imax = (internal->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS ?
 310                 internal->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS);
 311         for (i = 0; i < imax; i++) {
 312                 igb_stats->q_opackets[i] = internal->tx_queue[i].tx_pkts;
 313                 igb_stats->q_errors[i] = internal->tx_queue[i].err_pkts;
 314                 igb_stats->q_obytes[i] = internal->tx_queue[i].tx_bytes;
 315                 tx_total += igb_stats->q_opackets[i];
 316                 tx_err_total += igb_stats->q_errors[i];
 317                 tx_bytes_total += igb_stats->q_obytes[i];
 318         }
 319
 320         igb_stats->ipackets = rx_total;
 321         igb_stats->ibytes = rx_bytes_total;
 322         igb_stats->opackets = tx_total;
 323         igb_stats->oerrors = tx_err_total;
 324         igb_stats->obytes = tx_bytes_total;
 325 }
 326
 327 static void
 328 eth_stats_reset(struct rte_eth_dev *dev)
 329 {
 330         unsigned i;
 331         struct pmd_internals *internal = dev->data->dev_private;
 332
 333         for (i = 0; i < internal->nb_queues; i++) {
 334                 internal->rx_queue[i].rx_pkts = 0;
 335                 internal->rx_queue[i].rx_bytes = 0;
 336         }
 337
 338         for (i = 0; i < internal->nb_queues; i++) {
 339                 internal->tx_queue[i].tx_pkts = 0;
 340                 internal->tx_queue[i].err_pkts = 0;
 341                 internal->tx_queue[i].tx_bytes = 0;
 342         }
 343 }
 344
 345 static void
 346 eth_dev_close(struct rte_eth_dev *dev __rte_unused)
 347 {
 348 }
 349
 350 static void
 351 eth_queue_release(void *q __rte_unused)
 352 {
 353 }
 354
 355 static int
 356 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 357                 int wait_to_complete __rte_unused)
 358 {
 359         return 0;
 360 }
 361
 362 static int
 363 eth_rx_queue_setup(struct rte_eth_dev *dev,
 364                    uint16_t rx_queue_id,
 365                    uint16_t nb_rx_desc __rte_unused,
 366                    unsigned int socket_id __rte_unused,
 367                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 368                    struct rte_mempool *mb_pool)
 369 {
 370         struct pmd_internals *internals = dev->data->dev_private;
 371         struct pkt_rx_queue *pkt_q = &internals->rx_queue[rx_queue_id];
 372         uint16_t buf_size;
 373
 374         pkt_q->mb_pool = mb_pool;
 375
 376         /* Now get the space available for data in the mbuf */
 377         buf_size = (uint16_t)(rte_pktmbuf_data_room_size(pkt_q->mb_pool) -
 378                 RTE_PKTMBUF_HEADROOM);
 379
 380         if (ETH_FRAME_LEN > buf_size) {
 381                 RTE_LOG(ERR, PMD,
 382                         "%s: %d bytes will not fit in mbuf (%d bytes)\n",
 383                         dev->data->name, ETH_FRAME_LEN, buf_size);
 384                 return -ENOMEM;
 385         }
 386
 387         dev->data->rx_queues[rx_queue_id] = pkt_q;
 388         pkt_q->in_port = dev->data->port_id;
 389
 390         return 0;
 391 }
 392
 393 static int
 394 eth_tx_queue_setup(struct rte_eth_dev *dev,
 395                    uint16_t tx_queue_id,
 396                    uint16_t nb_tx_desc __rte_unused,
 397                    unsigned int socket_id __rte_unused,
 398                    const struct rte_eth_txconf *tx_conf __rte_unused)
 399 {
 400
 401         struct pmd_internals *internals = dev->data->dev_private;
 402
 403         dev->data->tx_queues[tx_queue_id] = &internals->tx_queue[tx_queue_id];
 404         return 0;
 405 }
 406
 407 static const struct eth_dev_ops ops = {
 408         .dev_start = eth_dev_start,
 409         .dev_stop = eth_dev_stop,
 410         .dev_close = eth_dev_close,
 411         .dev_configure = eth_dev_configure,
 412         .dev_infos_get = eth_dev_info,
 413         .rx_queue_setup = eth_rx_queue_setup,
 414         .tx_queue_setup = eth_tx_queue_setup,
 415         .rx_queue_release = eth_queue_release,
 416         .tx_queue_release = eth_queue_release,
 417         .link_update = eth_link_update,
 418         .stats_get = eth_stats_get,
 419         .stats_reset = eth_stats_reset,
 420 };
 421
 422 /*
 423  * Opens an AF_PACKET socket
 424  */
 425 static int
 426 open_packet_iface(const char *key __rte_unused,
 427                   const char *value __rte_unused,
 428                   void *extra_args)
 429 {
 430         int *sockfd = extra_args;
 431
 432         /* Open an AF_PACKET socket... */
 433         *sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
 434         if (*sockfd == -1) {
 435                 RTE_LOG(ERR, PMD, "Could not open AF_PACKET socket\n");
 436                 return -1;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int
 443 rte_pmd_init_internals(const char *name,
 444                        const int sockfd,
 445                        const unsigned nb_queues,
 446                        unsigned int blocksize,
 447                        unsigned int blockcnt,
 448                        unsigned int framesize,
 449                        unsigned int framecnt,
 450                        const unsigned numa_node,
 451                        struct pmd_internals **internals,
 452                        struct rte_eth_dev **eth_dev,
 453                        struct rte_kvargs *kvlist)
 454 {
 455         struct rte_eth_dev_data *data = NULL;
 456         struct rte_kvargs_pair *pair = NULL;
 457         struct ifreq ifr;
 458         size_t ifnamelen;
 459         unsigned k_idx;
 460         struct sockaddr_ll sockaddr;
 461         struct tpacket_req *req;
 462         struct pkt_rx_queue *rx_queue;
 463         struct pkt_tx_queue *tx_queue;
 464         int rc, tpver, discard;
 465         int qsockfd = -1;
 466         unsigned int i, q, rdsize;
 467         int fanout_arg __rte_unused, bypass __rte_unused;
 468
 469         for (k_idx = 0; k_idx < kvlist->count; k_idx++) {
 470                 pair = &kvlist->pairs[k_idx];
 471                 if (strstr(pair->key, ETH_AF_PACKET_IFACE_ARG) != NULL)
 472                         break;
 473         }
 474         if (pair == NULL) {
 475                 RTE_LOG(ERR, PMD,
 476                         "%s: no interface specified for AF_PACKET ethdev\n",
 477                         name);
 478                 goto error_early;
 479         }
 480
 481         RTE_LOG(INFO, PMD,
 482                 "%s: creating AF_PACKET-backed ethdev on numa socket %u\n",
 483                 name, numa_node);
 484
 485         /*
 486          * now do all data allocation - for eth_dev structure, dummy pci driver
 487          * and internal (private) data
 488          */
 489         data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
 490         if (data == NULL)
 491                 goto error_early;
 492
 493         *internals = rte_zmalloc_socket(name, sizeof(**internals),
 494                                         0, numa_node);
 495         if (*internals == NULL)
 496                 goto error_early;
 497
 498         for (q = 0; q < nb_queues; q++) {
 499                 (*internals)->rx_queue[q].map = MAP_FAILED;
 500                 (*internals)->tx_queue[q].map = MAP_FAILED;
 501         }
 502
 503         req = &((*internals)->req);
 504
 505         req->tp_block_size = blocksize;
 506         req->tp_block_nr = blockcnt;
 507         req->tp_frame_size = framesize;
 508         req->tp_frame_nr = framecnt;
 509
 510         ifnamelen = strlen(pair->value);
 511         if (ifnamelen < sizeof(ifr.ifr_name)) {
 512                 memcpy(ifr.ifr_name, pair->value, ifnamelen);
 513                 ifr.ifr_name[ifnamelen] = '\0';
 514         } else {
 515                 RTE_LOG(ERR, PMD,
 516                         "%s: I/F name too long (%s)\n",
 517                         name, pair->value);
 518                 goto error_early;
 519         }
 520         if (ioctl(sockfd, SIOCGIFINDEX, &ifr) == -1) {
 521                 RTE_LOG(ERR, PMD,
 522                         "%s: ioctl failed (SIOCGIFINDEX)\n",
 523                         name);
 524                 goto error_early;
 525         }
 526         (*internals)->if_index = ifr.ifr_ifindex;
 527
 528         if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) == -1) {
 529                 RTE_LOG(ERR, PMD,
 530                         "%s: ioctl failed (SIOCGIFHWADDR)\n",
 531                         name);
 532                 goto error_early;
 533         }
 534         memcpy(&(*internals)->eth_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
 535
 536         memset(&sockaddr, 0, sizeof(sockaddr));
 537         sockaddr.sll_family = AF_PACKET;
 538         sockaddr.sll_protocol = htons(ETH_P_ALL);
 539         sockaddr.sll_ifindex = (*internals)->if_index;
 540
 541 #if defined(PACKET_FANOUT)
 542         fanout_arg = (getpid() ^ (*internals)->if_index) & 0xffff;
 543         fanout_arg |= (PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_DEFRAG) << 16;
 544 #if defined(PACKET_FANOUT_FLAG_ROLLOVER)
 545         fanout_arg |= PACKET_FANOUT_FLAG_ROLLOVER << 16;
 546 #endif
 547 #endif
 548
 549         for (q = 0; q < nb_queues; q++) {
 550                 /* Open an AF_PACKET socket for this queue... */
 551                 qsockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
 552                 if (qsockfd == -1) {
 553                         RTE_LOG(ERR, PMD,
 554                                 "%s: could not open AF_PACKET socket\n",
 555                                 name);
 556                         return -1;
 557                 }
 558
 559                 tpver = TPACKET_V2;
 560                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_VERSION,
 561                                 &tpver, sizeof(tpver));
 562                 if (rc == -1) {
 563                         RTE_LOG(ERR, PMD,
 564                                 "%s: could not set PACKET_VERSION on AF_PACKET "
 565                                 "socket for %s\n", name, pair->value);
 566                         goto error;
 567                 }
 568
 569                 discard = 1;
 570                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_LOSS,
 571                                 &discard, sizeof(discard));
 572                 if (rc == -1) {
 573                         RTE_LOG(ERR, PMD,
 574                                 "%s: could not set PACKET_LOSS on "
 575                                 "AF_PACKET socket for %s\n", name, pair->value);
 576                         goto error;
 577                 }
 578
 579 #if defined(PACKET_QDISC_BYPASS)
 580                 bypass = 1;
 581                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_QDISC_BYPASS,
 582                                 &bypass, sizeof(bypass));
 583                 if (rc == -1) {
 584                         RTE_LOG(ERR, PMD,
 585                                 "%s: could not set PACKET_QDISC_BYPASS "
 586                                 "on AF_PACKET socket for %s\n", name,
 587                                 pair->value);
 588                         goto error;
 589                 }
 590 #endif
 591
 592                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_RX_RING, req, sizeof(*req));
 593                 if (rc == -1) {
 594                         RTE_LOG(ERR, PMD,
 595                                 "%s: could not set PACKET_RX_RING on AF_PACKET "
 596                                 "socket for %s\n", name, pair->value);
 597                         goto error;
 598                 }
 599
 600                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_TX_RING, req, sizeof(*req));
 601                 if (rc == -1) {
 602                         RTE_LOG(ERR, PMD,
 603                                 "%s: could not set PACKET_TX_RING on AF_PACKET "
 604                                 "socket for %s\n", name, pair->value);
 605                         goto error;
 606                 }
 607
 608                 rx_queue = &((*internals)->rx_queue[q]);
 609                 rx_queue->framecount = req->tp_frame_nr;
 610
 611                 rx_queue->map = mmap(NULL, 2 * req->tp_block_size * req->tp_block_nr,
 612                                     PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED,
 613                                     qsockfd, 0);
 614                 if (rx_queue->map == MAP_FAILED) {
 615                         RTE_LOG(ERR, PMD,
 616                                 "%s: call to mmap failed on AF_PACKET socket for %s\n",
 617                                 name, pair->value);
 618                         goto error;
 619                 }
 620
 621                 /* rdsize is same for both Tx and Rx */
 622                 rdsize = req->tp_frame_nr * sizeof(*(rx_queue->rd));
 623
 624                 rx_queue->rd = rte_zmalloc_socket(name, rdsize, 0, numa_node);
 625                 if (rx_queue->rd == NULL)
 626                         goto error;
 627                 for (i = 0; i < req->tp_frame_nr; ++i) {
 628                         rx_queue->rd[i].iov_base = rx_queue->map + (i * framesize);
 629                         rx_queue->rd[i].iov_len = req->tp_frame_size;
 630                 }
 631                 rx_queue->sockfd = qsockfd;
 632
 633                 tx_queue = &((*internals)->tx_queue[q]);
 634                 tx_queue->framecount = req->tp_frame_nr;
 635
 636                 tx_queue->map = rx_queue->map + req->tp_block_size * req->tp_block_nr;
 637
 638                 tx_queue->rd = rte_zmalloc_socket(name, rdsize, 0, numa_node);
 639                 if (tx_queue->rd == NULL)
 640                         goto error;
 641                 for (i = 0; i < req->tp_frame_nr; ++i) {
 642                         tx_queue->rd[i].iov_base = tx_queue->map + (i * framesize);
 643                         tx_queue->rd[i].iov_len = req->tp_frame_size;
 644                 }
 645                 tx_queue->sockfd = qsockfd;
 646
 647                 rc = bind(qsockfd, (const struct sockaddr*)&sockaddr, sizeof(sockaddr));
 648                 if (rc == -1) {
 649                         RTE_LOG(ERR, PMD,
 650                                 "%s: could not bind AF_PACKET socket to %s\n",
 651                                 name, pair->value);
 652                         goto error;
 653                 }
 654
 655 #if defined(PACKET_FANOUT)
 656                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_FANOUT,
 657                                 &fanout_arg, sizeof(fanout_arg));
 658                 if (rc == -1) {
 659                         RTE_LOG(ERR, PMD,
 660                                 "%s: could not set PACKET_FANOUT on AF_PACKET socket "
 661                                 "for %s\n", name, pair->value);
 662                         goto error;
 663                 }
 664 #endif
 665         }
 666
 667         /* reserve an ethdev entry */
 668         *eth_dev = rte_eth_dev_allocate(name);
 669         if (*eth_dev == NULL)
 670                 goto error;
 671
 672         /*
 673          * now put it all together
 674          * - store queue data in internals,
 675          * - store numa_node in eth_dev
 676          * - point eth_dev_data to internals
 677          * - and point eth_dev structure to new eth_dev_data structure
 678          */
 679
 680         (*internals)->nb_queues = nb_queues;
 681
 682         data->dev_private = *internals;
 683         data->port_id = (*eth_dev)->data->port_id;
 684         data->nb_rx_queues = (uint16_t)nb_queues;
 685         data->nb_tx_queues = (uint16_t)nb_queues;
 686         data->dev_link = pmd_link;
 687         data->mac_addrs = &(*internals)->eth_addr;
 688         strncpy(data->name,
 689                 (*eth_dev)->data->name, strlen((*eth_dev)->data->name));
 690
 691         (*eth_dev)->data = data;
 692         (*eth_dev)->dev_ops = &ops;
 693         (*eth_dev)->driver = NULL;
 694         (*eth_dev)->data->dev_flags = RTE_ETH_DEV_DETACHABLE;
 695         (*eth_dev)->data->drv_name = drivername;
 696         (*eth_dev)->data->kdrv = RTE_KDRV_NONE;
 697         (*eth_dev)->data->numa_node = numa_node;
 698
 699         return 0;
 700
 701 error:
 702         if (qsockfd != -1)
 703                 close(qsockfd);
 704         for (q = 0; q < nb_queues; q++) {
 705                 munmap((*internals)->rx_queue[q].map,
 706                        2 * req->tp_block_size * req->tp_block_nr);
 707
 708                 rte_free((*internals)->rx_queue[q].rd);
 709                 rte_free((*internals)->tx_queue[q].rd);
 710                 if (((*internals)->rx_queue[q].sockfd != 0) &&
 711                         ((*internals)->rx_queue[q].sockfd != qsockfd))
 712                         close((*internals)->rx_queue[q].sockfd);
 713         }
 714         rte_free(*internals);
 715 error_early:
 716         rte_free(data);
 717         return -1;
 718 }
 719
 720 static int
 721 rte_eth_from_packet(const char *name,
 722                     int const *sockfd,
 723                     const unsigned numa_node,
 724                     struct rte_kvargs *kvlist)
 725 {
 726         struct pmd_internals *internals = NULL;
 727         struct rte_eth_dev *eth_dev = NULL;
 728         struct rte_kvargs_pair *pair = NULL;
 729         unsigned k_idx;
 730         unsigned int blockcount;
 731         unsigned int blocksize = DFLT_BLOCK_SIZE;
 732         unsigned int framesize = DFLT_FRAME_SIZE;
 733         unsigned int framecount = DFLT_FRAME_COUNT;
 734         unsigned int qpairs = 1;
 735
 736         /* do some parameter checking */
 737         if (*sockfd < 0)
 738                 return -1;
 739
 740         /*
 741          * Walk arguments for configurable settings
 742          */
 743         for (k_idx = 0; k_idx < kvlist->count; k_idx++) {
 744                 pair = &kvlist->pairs[k_idx];
 745                 if (strstr(pair->key, ETH_AF_PACKET_NUM_Q_ARG) != NULL) {
 746                         qpairs = atoi(pair->value);
 747                         if (qpairs < 1 ||
 748                             qpairs > RTE_PMD_AF_PACKET_MAX_RINGS) {
 749                                 RTE_LOG(ERR, PMD,
 750                                         "%s: invalid qpairs value\n",
 751                                         name);
 752                                 return -1;
 753                         }
 754                         continue;
 755                 }
 756                 if (strstr(pair->key, ETH_AF_PACKET_BLOCKSIZE_ARG) != NULL) {
 757                         blocksize = atoi(pair->value);
 758                         if (!blocksize) {
 759                                 RTE_LOG(ERR, PMD,
 760                                         "%s: invalid blocksize value\n",
 761                                         name);
 762                                 return -1;
 763                         }
 764                         continue;
 765                 }
 766                 if (strstr(pair->key, ETH_AF_PACKET_FRAMESIZE_ARG) != NULL) {
 767                         framesize = atoi(pair->value);
 768                         if (!framesize) {
 769                                 RTE_LOG(ERR, PMD,
 770                                         "%s: invalid framesize value\n",
 771                                         name);
 772                                 return -1;
 773                         }
 774                         continue;
 775                 }
 776                 if (strstr(pair->key, ETH_AF_PACKET_FRAMECOUNT_ARG) != NULL) {
 777                         framecount = atoi(pair->value);
 778                         if (!framecount) {
 779                                 RTE_LOG(ERR, PMD,
 780                                         "%s: invalid framecount value\n",
 781                                         name);
 782                                 return -1;
 783                         }
 784                         continue;
 785                 }
 786         }
 787
 788         if (framesize > blocksize) {
 789                 RTE_LOG(ERR, PMD,
 790                         "%s: AF_PACKET MMAP frame size exceeds block size!\n",
 791                         name);
 792                 return -1;
 793         }
 794
 795         blockcount = framecount / (blocksize / framesize);
 796         if (!blockcount) {
 797                 RTE_LOG(ERR, PMD,
 798                         "%s: invalid AF_PACKET MMAP parameters\n", name);
 799                 return -1;
 800         }
 801
 802         RTE_LOG(INFO, PMD, "%s: AF_PACKET MMAP parameters:\n", name);
 803         RTE_LOG(INFO, PMD, "%s:\tblock size %d\n", name, blocksize);
 804         RTE_LOG(INFO, PMD, "%s:\tblock count %d\n", name, blockcount);
 805         RTE_LOG(INFO, PMD, "%s:\tframe size %d\n", name, framesize);
 806         RTE_LOG(INFO, PMD, "%s:\tframe count %d\n", name, framecount);
 807
 808         if (rte_pmd_init_internals(name, *sockfd, qpairs,
 809                                    blocksize, blockcount,
 810                                    framesize, framecount,
 811                                    numa_node, &internals, &eth_dev,
 812                                    kvlist) < 0)
 813                 return -1;
 814
 815         eth_dev->rx_pkt_burst = eth_af_packet_rx;
 816         eth_dev->tx_pkt_burst = eth_af_packet_tx;
 817
 818         return 0;
 819 }
 820
 821 static int
 822 rte_pmd_af_packet_probe(const char *name, const char *params)
 823 {
 824         unsigned numa_node;
 825         int ret = 0;
 826         struct rte_kvargs *kvlist;
 827         int sockfd = -1;
 828
 829         RTE_LOG(INFO, PMD, "Initializing pmd_af_packet for %s\n", name);
 830
 831         numa_node = rte_socket_id();
 832
 833         kvlist = rte_kvargs_parse(params, valid_arguments);
 834         if (kvlist == NULL) {
 835                 ret = -1;
 836                 goto exit;
 837         }
 838
 839         /*
 840          * If iface argument is passed we open the NICs and use them for
 841          * reading / writing
 842          */
 843         if (rte_kvargs_count(kvlist, ETH_AF_PACKET_IFACE_ARG) == 1) {
 844
 845                 ret = rte_kvargs_process(kvlist, ETH_AF_PACKET_IFACE_ARG,
 846                                          &open_packet_iface, &sockfd);
 847                 if (ret < 0)
 848                         goto exit;
 849         }
 850
 851         ret = rte_eth_from_packet(name, &sockfd, numa_node, kvlist);
 852         close(sockfd); /* no longer needed */
 853
 854 exit:
 855         rte_kvargs_free(kvlist);
 856         return ret;
 857 }
 858
 859 static int
 860 rte_pmd_af_packet_remove(const char *name)
 861 {
 862         struct rte_eth_dev *eth_dev = NULL;
 863         struct pmd_internals *internals;
 864         unsigned q;
 865
 866         RTE_LOG(INFO, PMD, "Closing AF_PACKET ethdev on numa socket %u\n",
 867                         rte_socket_id());
 868
 869         if (name == NULL)
 870                 return -1;
 871
 872         /* find the ethdev entry */
 873         eth_dev = rte_eth_dev_allocated(name);
 874         if (eth_dev == NULL)
 875                 return -1;
 876
 877         internals = eth_dev->data->dev_private;
 878         for (q = 0; q < internals->nb_queues; q++) {
 879                 rte_free(internals->rx_queue[q].rd);
 880                 rte_free(internals->tx_queue[q].rd);
 881         }
 882
 883         rte_free(eth_dev->data->dev_private);
 884         rte_free(eth_dev->data);
 885
 886         rte_eth_dev_release_port(eth_dev);
 887
 888         return 0;
 889 }
 890
 891 static struct rte_vdev_driver pmd_af_packet_drv = {
 892         .probe = rte_pmd_af_packet_probe,
 893         .remove = rte_pmd_af_packet_remove,
 894 };
 895
 896 RTE_PMD_REGISTER_VDEV(net_af_packet, pmd_af_packet_drv);
 897 RTE_PMD_REGISTER_ALIAS(net_af_packet, eth_af_packet);
 898 RTE_PMD_REGISTER_PARAM_STRING(net_af_packet,
 899         "iface=<string> "
 900         "qpairs=<int> "
 901         "blocksz=<int> "
 902         "framesz=<int> "
 903         "framecnt=<int>");