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         unsigned int frame_data_size;
  87
  88         struct iovec *rd;
  89         uint8_t *map;
  90         unsigned int framecount;
  91         unsigned int framenum;
  92
  93         volatile unsigned long tx_pkts;
  94         volatile unsigned long err_pkts;
  95         volatile unsigned long tx_bytes;
  96 };
  97
  98 struct pmd_internals {
  99         unsigned nb_queues;
 100
 101         int if_index;
 102         char *if_name;
 103         struct ether_addr eth_addr;
 104
 105         struct tpacket_req req;
 106
 107         struct pkt_rx_queue rx_queue[RTE_PMD_AF_PACKET_MAX_RINGS];
 108         struct pkt_tx_queue tx_queue[RTE_PMD_AF_PACKET_MAX_RINGS];
 109 };
 110
 111 static const char *valid_arguments[] = {
 112         ETH_AF_PACKET_IFACE_ARG,
 113         ETH_AF_PACKET_NUM_Q_ARG,
 114         ETH_AF_PACKET_BLOCKSIZE_ARG,
 115         ETH_AF_PACKET_FRAMESIZE_ARG,
 116         ETH_AF_PACKET_FRAMECOUNT_ARG,
 117         NULL
 118 };
 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                 mbuf = *bufs++;
 210
 211                 /* drop oversized packets */
 212                 if (rte_pktmbuf_data_len(mbuf) > pkt_q->frame_data_size) {
 213                         rte_pktmbuf_free(mbuf);
 214                         continue;
 215                 }
 216
 217                 /* point at the next incoming frame */
 218                 if ((ppd->tp_status != TP_STATUS_AVAILABLE) &&
 219                     (poll(&pfd, 1, -1) < 0))
 220                         break;
 221
 222                 /* copy the tx frame data */
 223                 pbuf = (uint8_t *) ppd + TPACKET2_HDRLEN -
 224                         sizeof(struct sockaddr_ll);
 225                 memcpy(pbuf, rte_pktmbuf_mtod(mbuf, void*), rte_pktmbuf_data_len(mbuf));
 226                 ppd->tp_len = ppd->tp_snaplen = rte_pktmbuf_data_len(mbuf);
 227
 228                 /* release incoming frame and advance ring buffer */
 229                 ppd->tp_status = TP_STATUS_SEND_REQUEST;
 230                 if (++framenum >= framecount)
 231                         framenum = 0;
 232                 ppd = (struct tpacket2_hdr *) pkt_q->rd[framenum].iov_base;
 233
 234                 num_tx++;
 235                 num_tx_bytes += mbuf->pkt_len;
 236                 rte_pktmbuf_free(mbuf);
 237         }
 238
 239         /* kick-off transmits */
 240         if (sendto(pkt_q->sockfd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1)
 241                 num_tx = 0; /* error sending -- no packets transmitted */
 242
 243         pkt_q->framenum = framenum;
 244         pkt_q->tx_pkts += num_tx;
 245         pkt_q->err_pkts += i - num_tx;
 246         pkt_q->tx_bytes += num_tx_bytes;
 247         return i;
 248 }
 249
 250 static int
 251 eth_dev_start(struct rte_eth_dev *dev)
 252 {
 253         dev->data->dev_link.link_status = ETH_LINK_UP;
 254         return 0;
 255 }
 256
 257 /*
 258  * This function gets called when the current port gets stopped.
 259  */
 260 static void
 261 eth_dev_stop(struct rte_eth_dev *dev)
 262 {
 263         unsigned i;
 264         int sockfd;
 265         struct pmd_internals *internals = dev->data->dev_private;
 266
 267         for (i = 0; i < internals->nb_queues; i++) {
 268                 sockfd = internals->rx_queue[i].sockfd;
 269                 if (sockfd != -1)
 270                         close(sockfd);
 271
 272                 /* Prevent use after free in case tx fd == rx fd */
 273                 if (sockfd != internals->tx_queue[i].sockfd) {
 274                         sockfd = internals->tx_queue[i].sockfd;
 275                         if (sockfd != -1)
 276                                 close(sockfd);
 277                 }
 278
 279                 internals->rx_queue[i].sockfd = -1;
 280                 internals->tx_queue[i].sockfd = -1;
 281         }
 282
 283         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 284 }
 285
 286 static int
 287 eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
 288 {
 289         return 0;
 290 }
 291
 292 static void
 293 eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 294 {
 295         struct pmd_internals *internals = dev->data->dev_private;
 296
 297         dev_info->if_index = internals->if_index;
 298         dev_info->max_mac_addrs = 1;
 299         dev_info->max_rx_pktlen = (uint32_t)ETH_FRAME_LEN;
 300         dev_info->max_rx_queues = (uint16_t)internals->nb_queues;
 301         dev_info->max_tx_queues = (uint16_t)internals->nb_queues;
 302         dev_info->min_rx_bufsize = 0;
 303 }
 304
 305 static void
 306 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
 307 {
 308         unsigned i, imax;
 309         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 310         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 311         const struct pmd_internals *internal = dev->data->dev_private;
 312
 313         imax = (internal->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS ?
 314                 internal->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS);
 315         for (i = 0; i < imax; i++) {
 316                 igb_stats->q_ipackets[i] = internal->rx_queue[i].rx_pkts;
 317                 igb_stats->q_ibytes[i] = internal->rx_queue[i].rx_bytes;
 318                 rx_total += igb_stats->q_ipackets[i];
 319                 rx_bytes_total += igb_stats->q_ibytes[i];
 320         }
 321
 322         imax = (internal->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS ?
 323                 internal->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS);
 324         for (i = 0; i < imax; i++) {
 325                 igb_stats->q_opackets[i] = internal->tx_queue[i].tx_pkts;
 326                 igb_stats->q_errors[i] = internal->tx_queue[i].err_pkts;
 327                 igb_stats->q_obytes[i] = internal->tx_queue[i].tx_bytes;
 328                 tx_total += igb_stats->q_opackets[i];
 329                 tx_err_total += igb_stats->q_errors[i];
 330                 tx_bytes_total += igb_stats->q_obytes[i];
 331         }
 332
 333         igb_stats->ipackets = rx_total;
 334         igb_stats->ibytes = rx_bytes_total;
 335         igb_stats->opackets = tx_total;
 336         igb_stats->oerrors = tx_err_total;
 337         igb_stats->obytes = tx_bytes_total;
 338 }
 339
 340 static void
 341 eth_stats_reset(struct rte_eth_dev *dev)
 342 {
 343         unsigned i;
 344         struct pmd_internals *internal = dev->data->dev_private;
 345
 346         for (i = 0; i < internal->nb_queues; i++) {
 347                 internal->rx_queue[i].rx_pkts = 0;
 348                 internal->rx_queue[i].rx_bytes = 0;
 349         }
 350
 351         for (i = 0; i < internal->nb_queues; i++) {
 352                 internal->tx_queue[i].tx_pkts = 0;
 353                 internal->tx_queue[i].err_pkts = 0;
 354                 internal->tx_queue[i].tx_bytes = 0;
 355         }
 356 }
 357
 358 static void
 359 eth_dev_close(struct rte_eth_dev *dev __rte_unused)
 360 {
 361 }
 362
 363 static void
 364 eth_queue_release(void *q __rte_unused)
 365 {
 366 }
 367
 368 static int
 369 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 370                 int wait_to_complete __rte_unused)
 371 {
 372         return 0;
 373 }
 374
 375 static int
 376 eth_rx_queue_setup(struct rte_eth_dev *dev,
 377                    uint16_t rx_queue_id,
 378                    uint16_t nb_rx_desc __rte_unused,
 379                    unsigned int socket_id __rte_unused,
 380                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 381                    struct rte_mempool *mb_pool)
 382 {
 383         struct pmd_internals *internals = dev->data->dev_private;
 384         struct pkt_rx_queue *pkt_q = &internals->rx_queue[rx_queue_id];
 385         unsigned int buf_size, data_size;
 386
 387         pkt_q->mb_pool = mb_pool;
 388
 389         /* Now get the space available for data in the mbuf */
 390         buf_size = rte_pktmbuf_data_room_size(pkt_q->mb_pool) -
 391                 RTE_PKTMBUF_HEADROOM;
 392         data_size = internals->req.tp_frame_size;
 393         data_size -= TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
 394
 395         if (data_size > buf_size) {
 396                 RTE_LOG(ERR, PMD,
 397                         "%s: %d bytes will not fit in mbuf (%d bytes)\n",
 398                         dev->data->name, data_size, buf_size);
 399                 return -ENOMEM;
 400         }
 401
 402         dev->data->rx_queues[rx_queue_id] = pkt_q;
 403         pkt_q->in_port = dev->data->port_id;
 404
 405         return 0;
 406 }
 407
 408 static int
 409 eth_tx_queue_setup(struct rte_eth_dev *dev,
 410                    uint16_t tx_queue_id,
 411                    uint16_t nb_tx_desc __rte_unused,
 412                    unsigned int socket_id __rte_unused,
 413                    const struct rte_eth_txconf *tx_conf __rte_unused)
 414 {
 415
 416         struct pmd_internals *internals = dev->data->dev_private;
 417
 418         dev->data->tx_queues[tx_queue_id] = &internals->tx_queue[tx_queue_id];
 419         return 0;
 420 }
 421
 422 static const struct eth_dev_ops ops = {
 423         .dev_start = eth_dev_start,
 424         .dev_stop = eth_dev_stop,
 425         .dev_close = eth_dev_close,
 426         .dev_configure = eth_dev_configure,
 427         .dev_infos_get = eth_dev_info,
 428         .rx_queue_setup = eth_rx_queue_setup,
 429         .tx_queue_setup = eth_tx_queue_setup,
 430         .rx_queue_release = eth_queue_release,
 431         .tx_queue_release = eth_queue_release,
 432         .link_update = eth_link_update,
 433         .stats_get = eth_stats_get,
 434         .stats_reset = eth_stats_reset,
 435 };
 436
 437 /*
 438  * Opens an AF_PACKET socket
 439  */
 440 static int
 441 open_packet_iface(const char *key __rte_unused,
 442                   const char *value __rte_unused,
 443                   void *extra_args)
 444 {
 445         int *sockfd = extra_args;
 446
 447         /* Open an AF_PACKET socket... */
 448         *sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
 449         if (*sockfd == -1) {
 450                 RTE_LOG(ERR, PMD, "Could not open AF_PACKET socket\n");
 451                 return -1;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static struct rte_vdev_driver pmd_af_packet_drv;
 458
 459 static int
 460 rte_pmd_init_internals(const char *name,
 461                        const int sockfd,
 462                        const unsigned nb_queues,
 463                        unsigned int blocksize,
 464                        unsigned int blockcnt,
 465                        unsigned int framesize,
 466                        unsigned int framecnt,
 467                        const unsigned numa_node,
 468                        struct pmd_internals **internals,
 469                        struct rte_eth_dev **eth_dev,
 470                        struct rte_kvargs *kvlist)
 471 {
 472         struct rte_eth_dev_data *data = NULL;
 473         struct rte_kvargs_pair *pair = NULL;
 474         struct ifreq ifr;
 475         size_t ifnamelen;
 476         unsigned k_idx;
 477         struct sockaddr_ll sockaddr;
 478         struct tpacket_req *req;
 479         struct pkt_rx_queue *rx_queue;
 480         struct pkt_tx_queue *tx_queue;
 481         int rc, tpver, discard;
 482         int qsockfd = -1;
 483         unsigned int i, q, rdsize;
 484         int fanout_arg __rte_unused, bypass __rte_unused;
 485
 486         for (k_idx = 0; k_idx < kvlist->count; k_idx++) {
 487                 pair = &kvlist->pairs[k_idx];
 488                 if (strstr(pair->key, ETH_AF_PACKET_IFACE_ARG) != NULL)
 489                         break;
 490         }
 491         if (pair == NULL) {
 492                 RTE_LOG(ERR, PMD,
 493                         "%s: no interface specified for AF_PACKET ethdev\n",
 494                         name);
 495                 goto error_early;
 496         }
 497
 498         RTE_LOG(INFO, PMD,
 499                 "%s: creating AF_PACKET-backed ethdev on numa socket %u\n",
 500                 name, numa_node);
 501
 502         /*
 503          * now do all data allocation - for eth_dev structure, dummy pci driver
 504          * and internal (private) data
 505          */
 506         data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
 507         if (data == NULL)
 508                 goto error_early;
 509
 510         *internals = rte_zmalloc_socket(name, sizeof(**internals),
 511                                         0, numa_node);
 512         if (*internals == NULL)
 513                 goto error_early;
 514
 515         for (q = 0; q < nb_queues; q++) {
 516                 (*internals)->rx_queue[q].map = MAP_FAILED;
 517                 (*internals)->tx_queue[q].map = MAP_FAILED;
 518         }
 519
 520         req = &((*internals)->req);
 521
 522         req->tp_block_size = blocksize;
 523         req->tp_block_nr = blockcnt;
 524         req->tp_frame_size = framesize;
 525         req->tp_frame_nr = framecnt;
 526
 527         ifnamelen = strlen(pair->value);
 528         if (ifnamelen < sizeof(ifr.ifr_name)) {
 529                 memcpy(ifr.ifr_name, pair->value, ifnamelen);
 530                 ifr.ifr_name[ifnamelen] = '\0';
 531         } else {
 532                 RTE_LOG(ERR, PMD,
 533                         "%s: I/F name too long (%s)\n",
 534                         name, pair->value);
 535                 goto error_early;
 536         }
 537         if (ioctl(sockfd, SIOCGIFINDEX, &ifr) == -1) {
 538                 RTE_LOG(ERR, PMD,
 539                         "%s: ioctl failed (SIOCGIFINDEX)\n",
 540                         name);
 541                 goto error_early;
 542         }
 543         (*internals)->if_name = strdup(pair->value);
 544         (*internals)->if_index = ifr.ifr_ifindex;
 545
 546         if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) == -1) {
 547                 RTE_LOG(ERR, PMD,
 548                         "%s: ioctl failed (SIOCGIFHWADDR)\n",
 549                         name);
 550                 goto error_early;
 551         }
 552         memcpy(&(*internals)->eth_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
 553
 554         memset(&sockaddr, 0, sizeof(sockaddr));
 555         sockaddr.sll_family = AF_PACKET;
 556         sockaddr.sll_protocol = htons(ETH_P_ALL);
 557         sockaddr.sll_ifindex = (*internals)->if_index;
 558
 559 #if defined(PACKET_FANOUT)
 560         fanout_arg = (getpid() ^ (*internals)->if_index) & 0xffff;
 561         fanout_arg |= (PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_DEFRAG) << 16;
 562 #if defined(PACKET_FANOUT_FLAG_ROLLOVER)
 563         fanout_arg |= PACKET_FANOUT_FLAG_ROLLOVER << 16;
 564 #endif
 565 #endif
 566
 567         for (q = 0; q < nb_queues; q++) {
 568                 /* Open an AF_PACKET socket for this queue... */
 569                 qsockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
 570                 if (qsockfd == -1) {
 571                         RTE_LOG(ERR, PMD,
 572                                 "%s: could not open AF_PACKET socket\n",
 573                                 name);
 574                         return -1;
 575                 }
 576
 577                 tpver = TPACKET_V2;
 578                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_VERSION,
 579                                 &tpver, sizeof(tpver));
 580                 if (rc == -1) {
 581                         RTE_LOG(ERR, PMD,
 582                                 "%s: could not set PACKET_VERSION on AF_PACKET "
 583                                 "socket for %s\n", name, pair->value);
 584                         goto error;
 585                 }
 586
 587                 discard = 1;
 588                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_LOSS,
 589                                 &discard, sizeof(discard));
 590                 if (rc == -1) {
 591                         RTE_LOG(ERR, PMD,
 592                                 "%s: could not set PACKET_LOSS on "
 593                                 "AF_PACKET socket for %s\n", name, pair->value);
 594                         goto error;
 595                 }
 596
 597 #if defined(PACKET_QDISC_BYPASS)
 598                 bypass = 1;
 599                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_QDISC_BYPASS,
 600                                 &bypass, sizeof(bypass));
 601                 if (rc == -1) {
 602                         RTE_LOG(ERR, PMD,
 603                                 "%s: could not set PACKET_QDISC_BYPASS "
 604                                 "on AF_PACKET socket for %s\n", name,
 605                                 pair->value);
 606                         goto error;
 607                 }
 608 #endif
 609
 610                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_RX_RING, req, sizeof(*req));
 611                 if (rc == -1) {
 612                         RTE_LOG(ERR, PMD,
 613                                 "%s: could not set PACKET_RX_RING on AF_PACKET "
 614                                 "socket for %s\n", name, pair->value);
 615                         goto error;
 616                 }
 617
 618                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_TX_RING, req, sizeof(*req));
 619                 if (rc == -1) {
 620                         RTE_LOG(ERR, PMD,
 621                                 "%s: could not set PACKET_TX_RING on AF_PACKET "
 622                                 "socket for %s\n", name, pair->value);
 623                         goto error;
 624                 }
 625
 626                 rx_queue = &((*internals)->rx_queue[q]);
 627                 rx_queue->framecount = req->tp_frame_nr;
 628
 629                 rx_queue->map = mmap(NULL, 2 * req->tp_block_size * req->tp_block_nr,
 630                                     PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED,
 631                                     qsockfd, 0);
 632                 if (rx_queue->map == MAP_FAILED) {
 633                         RTE_LOG(ERR, PMD,
 634                                 "%s: call to mmap failed on AF_PACKET socket for %s\n",
 635                                 name, pair->value);
 636                         goto error;
 637                 }
 638
 639                 /* rdsize is same for both Tx and Rx */
 640                 rdsize = req->tp_frame_nr * sizeof(*(rx_queue->rd));
 641
 642                 rx_queue->rd = rte_zmalloc_socket(name, rdsize, 0, numa_node);
 643                 if (rx_queue->rd == NULL)
 644                         goto error;
 645                 for (i = 0; i < req->tp_frame_nr; ++i) {
 646                         rx_queue->rd[i].iov_base = rx_queue->map + (i * framesize);
 647                         rx_queue->rd[i].iov_len = req->tp_frame_size;
 648                 }
 649                 rx_queue->sockfd = qsockfd;
 650
 651                 tx_queue = &((*internals)->tx_queue[q]);
 652                 tx_queue->framecount = req->tp_frame_nr;
 653                 tx_queue->frame_data_size = req->tp_frame_size;
 654                 tx_queue->frame_data_size -= TPACKET2_HDRLEN -
 655                         sizeof(struct sockaddr_ll);
 656
 657                 tx_queue->map = rx_queue->map + req->tp_block_size * req->tp_block_nr;
 658
 659                 tx_queue->rd = rte_zmalloc_socket(name, rdsize, 0, numa_node);
 660                 if (tx_queue->rd == NULL)
 661                         goto error;
 662                 for (i = 0; i < req->tp_frame_nr; ++i) {
 663                         tx_queue->rd[i].iov_base = tx_queue->map + (i * framesize);
 664                         tx_queue->rd[i].iov_len = req->tp_frame_size;
 665                 }
 666                 tx_queue->sockfd = qsockfd;
 667
 668                 rc = bind(qsockfd, (const struct sockaddr*)&sockaddr, sizeof(sockaddr));
 669                 if (rc == -1) {
 670                         RTE_LOG(ERR, PMD,
 671                                 "%s: could not bind AF_PACKET socket to %s\n",
 672                                 name, pair->value);
 673                         goto error;
 674                 }
 675
 676 #if defined(PACKET_FANOUT)
 677                 rc = setsockopt(qsockfd, SOL_PACKET, PACKET_FANOUT,
 678                                 &fanout_arg, sizeof(fanout_arg));
 679                 if (rc == -1) {
 680                         RTE_LOG(ERR, PMD,
 681                                 "%s: could not set PACKET_FANOUT on AF_PACKET socket "
 682                                 "for %s\n", name, pair->value);
 683                         goto error;
 684                 }
 685 #endif
 686         }
 687
 688         /* reserve an ethdev entry */
 689         *eth_dev = rte_eth_dev_allocate(name);
 690         if (*eth_dev == NULL)
 691                 goto error;
 692
 693         /*
 694          * now put it all together
 695          * - store queue data in internals,
 696          * - store numa_node in eth_dev
 697          * - point eth_dev_data to internals
 698          * - and point eth_dev structure to new eth_dev_data structure
 699          */
 700
 701         (*internals)->nb_queues = nb_queues;
 702
 703         data->dev_private = *internals;
 704         data->port_id = (*eth_dev)->data->port_id;
 705         data->nb_rx_queues = (uint16_t)nb_queues;
 706         data->nb_tx_queues = (uint16_t)nb_queues;
 707         data->dev_link = pmd_link;
 708         data->mac_addrs = &(*internals)->eth_addr;
 709         strncpy(data->name,
 710                 (*eth_dev)->data->name, strlen((*eth_dev)->data->name));
 711
 712         (*eth_dev)->data = data;
 713         (*eth_dev)->dev_ops = &ops;
 714         (*eth_dev)->driver = NULL;
 715         (*eth_dev)->data->dev_flags = RTE_ETH_DEV_DETACHABLE;
 716         (*eth_dev)->data->drv_name = pmd_af_packet_drv.driver.name;
 717         (*eth_dev)->data->kdrv = RTE_KDRV_NONE;
 718         (*eth_dev)->data->numa_node = numa_node;
 719
 720         return 0;
 721
 722 error:
 723         if (qsockfd != -1)
 724                 close(qsockfd);
 725         for (q = 0; q < nb_queues; q++) {
 726                 munmap((*internals)->rx_queue[q].map,
 727                        2 * req->tp_block_size * req->tp_block_nr);
 728
 729                 rte_free((*internals)->rx_queue[q].rd);
 730                 rte_free((*internals)->tx_queue[q].rd);
 731                 if (((*internals)->rx_queue[q].sockfd != 0) &&
 732                         ((*internals)->rx_queue[q].sockfd != qsockfd))
 733                         close((*internals)->rx_queue[q].sockfd);
 734         }
 735         free((*internals)->if_name);
 736         rte_free(*internals);
 737 error_early:
 738         rte_free(data);
 739         return -1;
 740 }
 741
 742 static int
 743 rte_eth_from_packet(const char *name,
 744                     int const *sockfd,
 745                     const unsigned numa_node,
 746                     struct rte_kvargs *kvlist)
 747 {
 748         struct pmd_internals *internals = NULL;
 749         struct rte_eth_dev *eth_dev = NULL;
 750         struct rte_kvargs_pair *pair = NULL;
 751         unsigned k_idx;
 752         unsigned int blockcount;
 753         unsigned int blocksize = DFLT_BLOCK_SIZE;
 754         unsigned int framesize = DFLT_FRAME_SIZE;
 755         unsigned int framecount = DFLT_FRAME_COUNT;
 756         unsigned int qpairs = 1;
 757
 758         /* do some parameter checking */
 759         if (*sockfd < 0)
 760                 return -1;
 761
 762         /*
 763          * Walk arguments for configurable settings
 764          */
 765         for (k_idx = 0; k_idx < kvlist->count; k_idx++) {
 766                 pair = &kvlist->pairs[k_idx];
 767                 if (strstr(pair->key, ETH_AF_PACKET_NUM_Q_ARG) != NULL) {
 768                         qpairs = atoi(pair->value);
 769                         if (qpairs < 1 ||
 770                             qpairs > RTE_PMD_AF_PACKET_MAX_RINGS) {
 771                                 RTE_LOG(ERR, PMD,
 772                                         "%s: invalid qpairs value\n",
 773                                         name);
 774                                 return -1;
 775                         }
 776                         continue;
 777                 }
 778                 if (strstr(pair->key, ETH_AF_PACKET_BLOCKSIZE_ARG) != NULL) {
 779                         blocksize = atoi(pair->value);
 780                         if (!blocksize) {
 781                                 RTE_LOG(ERR, PMD,
 782                                         "%s: invalid blocksize value\n",
 783                                         name);
 784                                 return -1;
 785                         }
 786                         continue;
 787                 }
 788                 if (strstr(pair->key, ETH_AF_PACKET_FRAMESIZE_ARG) != NULL) {
 789                         framesize = atoi(pair->value);
 790                         if (!framesize) {
 791                                 RTE_LOG(ERR, PMD,
 792                                         "%s: invalid framesize value\n",
 793                                         name);
 794                                 return -1;
 795                         }
 796                         continue;
 797                 }
 798                 if (strstr(pair->key, ETH_AF_PACKET_FRAMECOUNT_ARG) != NULL) {
 799                         framecount = atoi(pair->value);
 800                         if (!framecount) {
 801                                 RTE_LOG(ERR, PMD,
 802                                         "%s: invalid framecount value\n",
 803                                         name);
 804                                 return -1;
 805                         }
 806                         continue;
 807                 }
 808         }
 809
 810         if (framesize > blocksize) {
 811                 RTE_LOG(ERR, PMD,
 812                         "%s: AF_PACKET MMAP frame size exceeds block size!\n",
 813                         name);
 814                 return -1;
 815         }
 816
 817         blockcount = framecount / (blocksize / framesize);
 818         if (!blockcount) {
 819                 RTE_LOG(ERR, PMD,
 820                         "%s: invalid AF_PACKET MMAP parameters\n", name);
 821                 return -1;
 822         }
 823
 824         RTE_LOG(INFO, PMD, "%s: AF_PACKET MMAP parameters:\n", name);
 825         RTE_LOG(INFO, PMD, "%s:\tblock size %d\n", name, blocksize);
 826         RTE_LOG(INFO, PMD, "%s:\tblock count %d\n", name, blockcount);
 827         RTE_LOG(INFO, PMD, "%s:\tframe size %d\n", name, framesize);
 828         RTE_LOG(INFO, PMD, "%s:\tframe count %d\n", name, framecount);
 829
 830         if (rte_pmd_init_internals(name, *sockfd, qpairs,
 831                                    blocksize, blockcount,
 832                                    framesize, framecount,
 833                                    numa_node, &internals, &eth_dev,
 834                                    kvlist) < 0)
 835                 return -1;
 836
 837         eth_dev->rx_pkt_burst = eth_af_packet_rx;
 838         eth_dev->tx_pkt_burst = eth_af_packet_tx;
 839
 840         return 0;
 841 }
 842
 843 static int
 844 rte_pmd_af_packet_probe(const char *name, const char *params)
 845 {
 846         unsigned numa_node;
 847         int ret = 0;
 848         struct rte_kvargs *kvlist;
 849         int sockfd = -1;
 850
 851         RTE_LOG(INFO, PMD, "Initializing pmd_af_packet for %s\n", name);
 852
 853         numa_node = rte_socket_id();
 854
 855         kvlist = rte_kvargs_parse(params, valid_arguments);
 856         if (kvlist == NULL) {
 857                 ret = -1;
 858                 goto exit;
 859         }
 860
 861         /*
 862          * If iface argument is passed we open the NICs and use them for
 863          * reading / writing
 864          */
 865         if (rte_kvargs_count(kvlist, ETH_AF_PACKET_IFACE_ARG) == 1) {
 866
 867                 ret = rte_kvargs_process(kvlist, ETH_AF_PACKET_IFACE_ARG,
 868                                          &open_packet_iface, &sockfd);
 869                 if (ret < 0)
 870                         goto exit;
 871         }
 872
 873         ret = rte_eth_from_packet(name, &sockfd, numa_node, kvlist);
 874         close(sockfd); /* no longer needed */
 875
 876 exit:
 877         rte_kvargs_free(kvlist);
 878         return ret;
 879 }
 880
 881 static int
 882 rte_pmd_af_packet_remove(const char *name)
 883 {
 884         struct rte_eth_dev *eth_dev = NULL;
 885         struct pmd_internals *internals;
 886         unsigned q;
 887
 888         RTE_LOG(INFO, PMD, "Closing AF_PACKET ethdev on numa socket %u\n",
 889                         rte_socket_id());
 890
 891         if (name == NULL)
 892                 return -1;
 893
 894         /* find the ethdev entry */
 895         eth_dev = rte_eth_dev_allocated(name);
 896         if (eth_dev == NULL)
 897                 return -1;
 898
 899         internals = eth_dev->data->dev_private;
 900         for (q = 0; q < internals->nb_queues; q++) {
 901                 rte_free(internals->rx_queue[q].rd);
 902                 rte_free(internals->tx_queue[q].rd);
 903         }
 904         free(internals->if_name);
 905
 906         rte_free(eth_dev->data->dev_private);
 907         rte_free(eth_dev->data);
 908
 909         rte_eth_dev_release_port(eth_dev);
 910
 911         return 0;
 912 }
 913
 914 static struct rte_vdev_driver pmd_af_packet_drv = {
 915         .probe = rte_pmd_af_packet_probe,
 916         .remove = rte_pmd_af_packet_remove,
 917 };
 918
 919 RTE_PMD_REGISTER_VDEV(net_af_packet, pmd_af_packet_drv);
 920 RTE_PMD_REGISTER_ALIAS(net_af_packet, eth_af_packet);
 921 RTE_PMD_REGISTER_PARAM_STRING(net_af_packet,
 922         "iface=<string> "
 923         "qpairs=<int> "
 924         "blocksz=<int> "
 925         "framesz=<int> "
 926         "framecnt=<int>");