drivers/net/tap/rte_eth_tap.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2016 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <rte_mbuf.h>
  35 #include <rte_ethdev.h>
  36 #include <rte_malloc.h>
  37 #include <rte_vdev.h>
  38 #include <rte_kvargs.h>
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <sys/socket.h>
  43 #include <sys/ioctl.h>
  44 #include <sys/mman.h>
  45 #include <unistd.h>
  46 #include <poll.h>
  47 #include <arpa/inet.h>
  48 #include <linux/if.h>
  49 #include <linux/if_tun.h>
  50 #include <linux/if_ether.h>
  51 #include <fcntl.h>
  52
  53 /* Linux based path to the TUN device */
  54 #define TUN_TAP_DEV_PATH        "/dev/net/tun"
  55 #define DEFAULT_TAP_NAME        "dtap"
  56
  57 #define ETH_TAP_IFACE_ARG       "iface"
  58 #define ETH_TAP_SPEED_ARG       "speed"
  59
  60 #define RTE_PMD_TAP_MAX_QUEUES  16
  61
  62 static struct rte_vdev_driver pmd_tap_drv;
  63
  64 static const char *valid_arguments[] = {
  65         ETH_TAP_IFACE_ARG,
  66         ETH_TAP_SPEED_ARG,
  67         NULL
  68 };
  69
  70 static int tap_unit;
  71
  72 static struct rte_eth_link pmd_link = {
  73         .link_speed = ETH_SPEED_NUM_10G,
  74         .link_duplex = ETH_LINK_FULL_DUPLEX,
  75         .link_status = ETH_LINK_DOWN,
  76         .link_autoneg = ETH_LINK_SPEED_AUTONEG
  77 };
  78
  79 struct pkt_stats {
  80         uint64_t opackets;              /* Number of output packets */
  81         uint64_t ipackets;              /* Number of input packets */
  82         uint64_t obytes;                /* Number of bytes on output */
  83         uint64_t ibytes;                /* Number of bytes on input */
  84         uint64_t errs;                  /* Number of error packets */
  85 };
  86
  87 struct rx_queue {
  88         struct rte_mempool *mp;         /* Mempool for RX packets */
  89         uint16_t in_port;               /* Port ID */
  90         int fd;
  91
  92         struct pkt_stats stats;         /* Stats for this RX queue */
  93 };
  94
  95 struct tx_queue {
  96         int fd;
  97         struct pkt_stats stats;         /* Stats for this TX queue */
  98 };
  99
 100 struct pmd_internals {
 101         char name[RTE_ETH_NAME_MAX_LEN];        /* Internal Tap device name */
 102         uint16_t nb_queues;             /* Number of queues supported */
 103         struct ether_addr eth_addr;     /* Mac address of the device port */
 104
 105         int if_index;                   /* IF_INDEX for the port */
 106         int fds[RTE_PMD_TAP_MAX_QUEUES]; /* List of all file descriptors */
 107
 108         struct rx_queue rxq[RTE_PMD_TAP_MAX_QUEUES];    /* List of RX queues */
 109         struct tx_queue txq[RTE_PMD_TAP_MAX_QUEUES];    /* List of TX queues */
 110 };
 111
 112 /* Tun/Tap allocation routine
 113  *
 114  * name is the number of the interface to use, unless NULL to take the host
 115  * supplied name.
 116  */
 117 static int
 118 tun_alloc(char *name)
 119 {
 120         struct ifreq ifr;
 121         unsigned int features;
 122         int fd;
 123
 124         memset(&ifr, 0, sizeof(struct ifreq));
 125
 126         ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
 127         if (name && name[0])
 128                 strncpy(ifr.ifr_name, name, IFNAMSIZ);
 129
 130         fd = open(TUN_TAP_DEV_PATH, O_RDWR);
 131         if (fd < 0) {
 132                 RTE_LOG(ERR, PMD, "Unable to create TAP interface");
 133                 goto error;
 134         }
 135
 136         /* Grab the TUN features to verify we can work */
 137         if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
 138                 RTE_LOG(ERR, PMD, "Unable to get TUN/TAP features\n");
 139                 goto error;
 140         }
 141         RTE_LOG(DEBUG, PMD, "TUN/TAP Features %08x\n", features);
 142
 143 #ifdef IFF_MULTI_QUEUE
 144         if (!(features & IFF_MULTI_QUEUE) && (RTE_PMD_TAP_MAX_QUEUES > 1)) {
 145                 RTE_LOG(DEBUG, PMD, "TUN/TAP device only one queue\n");
 146                 goto error;
 147         } else if ((features & IFF_ONE_QUEUE) &&
 148                         (RTE_PMD_TAP_MAX_QUEUES == 1)) {
 149                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 150                 RTE_LOG(DEBUG, PMD, "Single queue only support\n");
 151         } else {
 152                 ifr.ifr_flags |= IFF_MULTI_QUEUE;
 153                 RTE_LOG(DEBUG, PMD, "Multi-queue support for %d queues\n",
 154                         RTE_PMD_TAP_MAX_QUEUES);
 155         }
 156 #else
 157         if (RTE_PMD_TAP_MAX_QUEUES > 1) {
 158                 RTE_LOG(DEBUG, PMD, "TUN/TAP device only one queue\n");
 159                 goto error;
 160         } else {
 161                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 162                 RTE_LOG(DEBUG, PMD, "Single queue only support\n");
 163         }
 164 #endif
 165
 166         /* Set the TUN/TAP configuration and get the name if needed */
 167         if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
 168                 RTE_LOG(ERR, PMD, "Unable to set TUNSETIFF for %s\n",
 169                         ifr.ifr_name);
 170                 perror("TUNSETIFF");
 171                 goto error;
 172         }
 173
 174         /* Always set the file descriptor to non-blocking */
 175         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
 176                 RTE_LOG(ERR, PMD, "Unable to set to nonblocking\n");
 177                 perror("F_SETFL, NONBLOCK");
 178                 goto error;
 179         }
 180
 181         /* If the name is different that new name as default */
 182         if (name && strcmp(name, ifr.ifr_name))
 183                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", ifr.ifr_name);
 184
 185         return fd;
 186
 187 error:
 188         if (fd > 0)
 189                 close(fd);
 190         return -1;
 191 }
 192
 193 /* Callback to handle the rx burst of packets to the correct interface and
 194  * file descriptor(s) in a multi-queue setup.
 195  */
 196 static uint16_t
 197 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 198 {
 199         int len;
 200         struct rte_mbuf *mbuf;
 201         struct rx_queue *rxq = queue;
 202         uint16_t num_rx;
 203         unsigned long num_rx_bytes = 0;
 204
 205         for (num_rx = 0; num_rx < nb_pkts; ) {
 206                 /* allocate the next mbuf */
 207                 mbuf = rte_pktmbuf_alloc(rxq->mp);
 208                 if (unlikely(!mbuf)) {
 209                         RTE_LOG(WARNING, PMD, "Unable to allocate mbuf\n");
 210                         break;
 211                 }
 212
 213                 len = read(rxq->fd, rte_pktmbuf_mtod(mbuf, char *),
 214                            rte_pktmbuf_tailroom(mbuf));
 215                 if (len <= 0) {
 216                         rte_pktmbuf_free(mbuf);
 217                         break;
 218                 }
 219
 220                 mbuf->data_len = len;
 221                 mbuf->pkt_len = len;
 222                 mbuf->port = rxq->in_port;
 223
 224                 /* account for the receive frame */
 225                 bufs[num_rx++] = mbuf;
 226                 num_rx_bytes += mbuf->pkt_len;
 227         }
 228         rxq->stats.ipackets += num_rx;
 229         rxq->stats.ibytes += num_rx_bytes;
 230
 231         return num_rx;
 232 }
 233
 234 /* Callback to handle sending packets from the tap interface
 235  */
 236 static uint16_t
 237 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 238 {
 239         struct rte_mbuf *mbuf;
 240         struct tx_queue *txq = queue;
 241         struct pollfd pfd;
 242         uint16_t num_tx = 0;
 243         unsigned long num_tx_bytes = 0;
 244         int i, n;
 245
 246         if (unlikely(nb_pkts == 0))
 247                 return 0;
 248
 249         pfd.events = POLLOUT;
 250         pfd.fd = txq->fd;
 251         for (i = 0; i < nb_pkts; i++) {
 252                 n = poll(&pfd, 1, 0);
 253
 254                 if (n <= 0)
 255                         break;
 256
 257                 if (pfd.revents & POLLOUT) {
 258                         /* copy the tx frame data */
 259                         mbuf = bufs[num_tx];
 260                         n = write(pfd.fd, rte_pktmbuf_mtod(mbuf, void*),
 261                                   rte_pktmbuf_pkt_len(mbuf));
 262                         if (n <= 0)
 263                                 break;
 264
 265                         num_tx++;
 266                         num_tx_bytes += mbuf->pkt_len;
 267                         rte_pktmbuf_free(mbuf);
 268                 }
 269         }
 270
 271         txq->stats.opackets += num_tx;
 272         txq->stats.errs += nb_pkts - num_tx;
 273         txq->stats.obytes += num_tx_bytes;
 274
 275         return num_tx;
 276 }
 277
 278 static int tap_link_set_flags(struct pmd_internals *pmd, short flags, int add)
 279 {
 280         struct ifreq ifr;
 281         int err, s;
 282
 283         /*
 284          * An AF_INET/DGRAM socket is needed for
 285          * SIOCGIFFLAGS/SIOCSIFFLAGS, using fd won't work.
 286          */
 287         s = socket(AF_INET, SOCK_DGRAM, 0);
 288         if (s < 0) {
 289                 RTE_LOG(ERR, PMD,
 290                         "Unable to get a socket to set flags: %s\n",
 291                         strerror(errno));
 292                 return -1;
 293         }
 294         memset(&ifr, 0, sizeof(ifr));
 295         strncpy(ifr.ifr_name, pmd->name, IFNAMSIZ);
 296         err = ioctl(s, SIOCGIFFLAGS, &ifr);
 297         if (err < 0) {
 298                 RTE_LOG(ERR, PMD, "Unable to get tap netdevice flags: %s\n",
 299                         strerror(errno));
 300                 close(s);
 301                 return -1;
 302         }
 303         if (add)
 304                 ifr.ifr_flags |= flags;
 305         else
 306                 ifr.ifr_flags &= ~flags;
 307         err = ioctl(s, SIOCSIFFLAGS, &ifr);
 308         if (err < 0) {
 309                 RTE_LOG(ERR, PMD, "Unable to %s flags 0x%x: %s\n",
 310                         add ? "set" : "unset", flags, strerror(errno));
 311                 close(s);
 312                 return -1;
 313         }
 314         close(s);
 315
 316         return 0;
 317 }
 318
 319 static int
 320 tap_link_set_down(struct rte_eth_dev *dev)
 321 {
 322         struct pmd_internals *pmd = dev->data->dev_private;
 323
 324         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 325         return tap_link_set_flags(pmd, IFF_UP | IFF_NOARP, 0);
 326 }
 327
 328 static int
 329 tap_link_set_up(struct rte_eth_dev *dev)
 330 {
 331         struct pmd_internals *pmd = dev->data->dev_private;
 332
 333         dev->data->dev_link.link_status = ETH_LINK_UP;
 334         return tap_link_set_flags(pmd, IFF_UP | IFF_NOARP, 1);
 335 }
 336
 337 static int
 338 tap_dev_start(struct rte_eth_dev *dev)
 339 {
 340         return tap_link_set_up(dev);
 341 }
 342
 343 /* This function gets called when the current port gets stopped.
 344  */
 345 static void
 346 tap_dev_stop(struct rte_eth_dev *dev)
 347 {
 348         int i;
 349         struct pmd_internals *internals = dev->data->dev_private;
 350
 351         for (i = 0; i < internals->nb_queues; i++)
 352                 if (internals->fds[i] != -1)
 353                         close(internals->fds[i]);
 354         tap_link_set_down(dev);
 355 }
 356
 357 static int
 358 tap_dev_configure(struct rte_eth_dev *dev __rte_unused)
 359 {
 360         return 0;
 361 }
 362
 363 static void
 364 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 365 {
 366         struct pmd_internals *internals = dev->data->dev_private;
 367
 368         dev_info->if_index = internals->if_index;
 369         dev_info->max_mac_addrs = 1;
 370         dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
 371         dev_info->max_rx_queues = internals->nb_queues;
 372         dev_info->max_tx_queues = internals->nb_queues;
 373         dev_info->min_rx_bufsize = 0;
 374         dev_info->pci_dev = NULL;
 375 }
 376
 377 static void
 378 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
 379 {
 380         unsigned int i, imax;
 381         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 382         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 383         const struct pmd_internals *pmd = dev->data->dev_private;
 384
 385         imax = (pmd->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 386                 pmd->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 387
 388         for (i = 0; i < imax; i++) {
 389                 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
 390                 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
 391                 rx_total += tap_stats->q_ipackets[i];
 392                 rx_bytes_total += tap_stats->q_ibytes[i];
 393         }
 394
 395         for (i = 0; i < imax; i++) {
 396                 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
 397                 tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
 398                 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
 399                 tx_total += tap_stats->q_opackets[i];
 400                 tx_err_total += tap_stats->q_errors[i];
 401                 tx_bytes_total += tap_stats->q_obytes[i];
 402         }
 403
 404         tap_stats->ipackets = rx_total;
 405         tap_stats->ibytes = rx_bytes_total;
 406         tap_stats->opackets = tx_total;
 407         tap_stats->oerrors = tx_err_total;
 408         tap_stats->obytes = tx_bytes_total;
 409 }
 410
 411 static void
 412 tap_stats_reset(struct rte_eth_dev *dev)
 413 {
 414         int i;
 415         struct pmd_internals *pmd = dev->data->dev_private;
 416
 417         for (i = 0; i < pmd->nb_queues; i++) {
 418                 pmd->rxq[i].stats.ipackets = 0;
 419                 pmd->rxq[i].stats.ibytes = 0;
 420         }
 421
 422         for (i = 0; i < pmd->nb_queues; i++) {
 423                 pmd->txq[i].stats.opackets = 0;
 424                 pmd->txq[i].stats.errs = 0;
 425                 pmd->txq[i].stats.obytes = 0;
 426         }
 427 }
 428
 429 static void
 430 tap_dev_close(struct rte_eth_dev *dev __rte_unused)
 431 {
 432 }
 433
 434 static void
 435 tap_rx_queue_release(void *queue)
 436 {
 437         struct rx_queue *rxq = queue;
 438
 439         if (rxq && (rxq->fd > 0)) {
 440                 close(rxq->fd);
 441                 rxq->fd = -1;
 442         }
 443 }
 444
 445 static void
 446 tap_tx_queue_release(void *queue)
 447 {
 448         struct tx_queue *txq = queue;
 449
 450         if (txq && (txq->fd > 0)) {
 451                 close(txq->fd);
 452                 txq->fd = -1;
 453         }
 454 }
 455
 456 static int
 457 tap_link_update(struct rte_eth_dev *dev __rte_unused,
 458                 int wait_to_complete __rte_unused)
 459 {
 460         return 0;
 461 }
 462
 463 static int
 464 tap_setup_queue(struct rte_eth_dev *dev,
 465                 struct pmd_internals *internals,
 466                 uint16_t qid)
 467 {
 468         struct pmd_internals *pmd = dev->data->dev_private;
 469         struct rx_queue *rx = &internals->rxq[qid];
 470         struct tx_queue *tx = &internals->txq[qid];
 471         int fd;
 472
 473         fd = rx->fd;
 474         if (fd < 0) {
 475                 fd = tx->fd;
 476                 if (fd < 0) {
 477                         RTE_LOG(INFO, PMD, "Add queue to TAP %s for qid %d\n",
 478                                 pmd->name, qid);
 479                         fd = tun_alloc(pmd->name);
 480                         if (fd < 0) {
 481                                 RTE_LOG(ERR, PMD, "tun_alloc(%s) failed\n",
 482                                         pmd->name);
 483                                 return -1;
 484                         }
 485                 }
 486         }
 487
 488         rx->fd = fd;
 489         tx->fd = fd;
 490
 491         return fd;
 492 }
 493
 494 static int
 495 rx_setup_queue(struct rte_eth_dev *dev,
 496                 struct pmd_internals *internals,
 497                 uint16_t qid)
 498 {
 499         dev->data->rx_queues[qid] = &internals->rxq[qid];
 500
 501         return tap_setup_queue(dev, internals, qid);
 502 }
 503
 504 static int
 505 tx_setup_queue(struct rte_eth_dev *dev,
 506                 struct pmd_internals *internals,
 507                 uint16_t qid)
 508 {
 509         dev->data->tx_queues[qid] = &internals->txq[qid];
 510
 511         return tap_setup_queue(dev, internals, qid);
 512 }
 513
 514 static int
 515 tap_rx_queue_setup(struct rte_eth_dev *dev,
 516                    uint16_t rx_queue_id,
 517                    uint16_t nb_rx_desc __rte_unused,
 518                    unsigned int socket_id __rte_unused,
 519                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 520                    struct rte_mempool *mp)
 521 {
 522         struct pmd_internals *internals = dev->data->dev_private;
 523         uint16_t buf_size;
 524         int fd;
 525
 526         if ((rx_queue_id >= internals->nb_queues) || !mp) {
 527                 RTE_LOG(ERR, PMD, "nb_queues %d mp %p\n",
 528                         internals->nb_queues, mp);
 529                 return -1;
 530         }
 531
 532         internals->rxq[rx_queue_id].mp = mp;
 533         internals->rxq[rx_queue_id].in_port = dev->data->port_id;
 534
 535         /* Now get the space available for data in the mbuf */
 536         buf_size = (uint16_t)(rte_pktmbuf_data_room_size(mp) -
 537                                 RTE_PKTMBUF_HEADROOM);
 538
 539         if (buf_size < ETH_FRAME_LEN) {
 540                 RTE_LOG(ERR, PMD,
 541                         "%s: %d bytes will not fit in mbuf (%d bytes)\n",
 542                         dev->data->name, ETH_FRAME_LEN, buf_size);
 543                 return -ENOMEM;
 544         }
 545
 546         fd = rx_setup_queue(dev, internals, rx_queue_id);
 547         if (fd == -1)
 548                 return -1;
 549
 550         internals->fds[rx_queue_id] = fd;
 551         RTE_LOG(INFO, PMD, "RX TAP device name %s, qid %d on fd %d\n",
 552                 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
 553
 554         return 0;
 555 }
 556
 557 static int
 558 tap_tx_queue_setup(struct rte_eth_dev *dev,
 559                    uint16_t tx_queue_id,
 560                    uint16_t nb_tx_desc __rte_unused,
 561                    unsigned int socket_id __rte_unused,
 562                    const struct rte_eth_txconf *tx_conf __rte_unused)
 563 {
 564         struct pmd_internals *internals = dev->data->dev_private;
 565         int ret;
 566
 567         if (tx_queue_id >= internals->nb_queues)
 568                 return -1;
 569
 570         ret = tx_setup_queue(dev, internals, tx_queue_id);
 571         if (ret == -1)
 572                 return -1;
 573
 574         RTE_LOG(INFO, PMD, "TX TAP device name %s, qid %d on fd %d\n",
 575                 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
 576
 577         return 0;
 578 }
 579
 580 static const struct eth_dev_ops ops = {
 581         .dev_start              = tap_dev_start,
 582         .dev_stop               = tap_dev_stop,
 583         .dev_close              = tap_dev_close,
 584         .dev_configure          = tap_dev_configure,
 585         .dev_infos_get          = tap_dev_info,
 586         .rx_queue_setup         = tap_rx_queue_setup,
 587         .tx_queue_setup         = tap_tx_queue_setup,
 588         .rx_queue_release       = tap_rx_queue_release,
 589         .tx_queue_release       = tap_tx_queue_release,
 590         .link_update            = tap_link_update,
 591         .dev_set_link_up        = tap_link_set_up,
 592         .dev_set_link_down      = tap_link_set_down,
 593         .stats_get              = tap_stats_get,
 594         .stats_reset            = tap_stats_reset,
 595 };
 596
 597 static int
 598 pmd_mac_address(int fd, struct rte_eth_dev *dev, struct ether_addr *addr)
 599 {
 600         struct ifreq ifr;
 601
 602         if ((fd <= 0) || !dev || !addr)
 603                 return -1;
 604
 605         memset(&ifr, 0, sizeof(ifr));
 606
 607         if (ioctl(fd, SIOCGIFHWADDR, &ifr) == -1) {
 608                 RTE_LOG(ERR, PMD, "ioctl failed (SIOCGIFHWADDR) (%s)\n",
 609                         ifr.ifr_name);
 610                 return -1;
 611         }
 612
 613         rte_memcpy(addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
 614
 615         return 0;
 616 }
 617
 618 static int
 619 eth_dev_tap_create(const char *name, char *tap_name)
 620 {
 621         int numa_node = rte_socket_id();
 622         struct rte_eth_dev *dev = NULL;
 623         struct pmd_internals *pmd = NULL;
 624         struct rte_eth_dev_data *data = NULL;
 625         int i, fd = -1;
 626
 627         RTE_LOG(INFO, PMD,
 628                 "%s: Create TAP Ethernet device with %d queues on numa %u\n",
 629                  name, RTE_PMD_TAP_MAX_QUEUES, rte_socket_id());
 630
 631         data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node);
 632         if (!data) {
 633                 RTE_LOG(ERR, PMD, "Failed to allocate data\n");
 634                 goto error_exit;
 635         }
 636
 637         pmd = rte_zmalloc_socket(tap_name, sizeof(*pmd), 0, numa_node);
 638         if (!pmd) {
 639                 RTE_LOG(ERR, PMD, "Unable to allocate internal struct\n");
 640                 goto error_exit;
 641         }
 642
 643         /* Use the name and not the tap_name */
 644         dev = rte_eth_dev_allocate(tap_name);
 645         if (!dev) {
 646                 RTE_LOG(ERR, PMD, "Unable to allocate device struct\n");
 647                 goto error_exit;
 648         }
 649
 650         snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
 651
 652         pmd->nb_queues = RTE_PMD_TAP_MAX_QUEUES;
 653
 654         /* Setup some default values */
 655         data->dev_private = pmd;
 656         data->port_id = dev->data->port_id;
 657         data->dev_flags = RTE_ETH_DEV_DETACHABLE;
 658         data->kdrv = RTE_KDRV_NONE;
 659         data->drv_name = pmd_tap_drv.driver.name;
 660         data->numa_node = numa_node;
 661
 662         data->dev_link = pmd_link;
 663         data->mac_addrs = &pmd->eth_addr;
 664         data->nb_rx_queues = pmd->nb_queues;
 665         data->nb_tx_queues = pmd->nb_queues;
 666
 667         dev->data = data;
 668         dev->dev_ops = &ops;
 669         dev->driver = NULL;
 670         dev->rx_pkt_burst = pmd_rx_burst;
 671         dev->tx_pkt_burst = pmd_tx_burst;
 672         snprintf(dev->data->name, sizeof(dev->data->name), "%s", name);
 673
 674         /* Create the first Tap device */
 675         fd = tun_alloc(tap_name);
 676         if (fd < 0) {
 677                 RTE_LOG(ERR, PMD, "tun_alloc() failed\n");
 678                 goto error_exit;
 679         }
 680
 681         /* Presetup the fds to -1 as being not working */
 682         for (i = 1; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 683                 pmd->fds[i] = -1;
 684                 pmd->rxq[i].fd = -1;
 685                 pmd->txq[i].fd = -1;
 686         }
 687
 688         /* Take the TUN/TAP fd and place in the first location */
 689         pmd->rxq[0].fd = fd;
 690         pmd->txq[0].fd = fd;
 691         pmd->fds[0] = fd;
 692
 693         if (pmd_mac_address(fd, dev, &pmd->eth_addr) < 0) {
 694                 RTE_LOG(ERR, PMD, "Unable to get MAC address\n");
 695                 goto error_exit;
 696         }
 697
 698         return 0;
 699
 700 error_exit:
 701         RTE_PMD_DEBUG_TRACE("Unable to initialize %s\n", name);
 702
 703         rte_free(data);
 704         rte_free(pmd);
 705
 706         rte_eth_dev_release_port(dev);
 707
 708         return -EINVAL;
 709 }
 710
 711 static int
 712 set_interface_name(const char *key __rte_unused,
 713                    const char *value,
 714                    void *extra_args)
 715 {
 716         char *name = (char *)extra_args;
 717
 718         if (value)
 719                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
 720         else
 721                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
 722                          DEFAULT_TAP_NAME, (tap_unit - 1));
 723
 724         return 0;
 725 }
 726
 727 static int
 728 set_interface_speed(const char *key __rte_unused,
 729                     const char *value,
 730                     void *extra_args)
 731 {
 732         *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G;
 733
 734         return 0;
 735 }
 736
 737 /* Open a TAP interface device.
 738  */
 739 static int
 740 rte_pmd_tap_probe(const char *name, const char *params)
 741 {
 742         int ret;
 743         struct rte_kvargs *kvlist = NULL;
 744         int speed;
 745         char tap_name[RTE_ETH_NAME_MAX_LEN];
 746
 747         speed = ETH_SPEED_NUM_10G;
 748         snprintf(tap_name, sizeof(tap_name), "%s%d",
 749                  DEFAULT_TAP_NAME, tap_unit++);
 750
 751         if (params && (params[0] != '\0')) {
 752                 RTE_LOG(INFO, PMD, "paramaters (%s)\n", params);
 753
 754                 kvlist = rte_kvargs_parse(params, valid_arguments);
 755                 if (kvlist) {
 756                         if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) {
 757                                 ret = rte_kvargs_process(kvlist,
 758                                                          ETH_TAP_SPEED_ARG,
 759                                                          &set_interface_speed,
 760                                                          &speed);
 761                                 if (ret == -1)
 762                                         goto leave;
 763                         }
 764
 765                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
 766                                 ret = rte_kvargs_process(kvlist,
 767                                                          ETH_TAP_IFACE_ARG,
 768                                                          &set_interface_name,
 769                                                          tap_name);
 770                                 if (ret == -1)
 771                                         goto leave;
 772                         }
 773                 }
 774         }
 775         pmd_link.link_speed = speed;
 776
 777         RTE_LOG(INFO, PMD, "Initializing pmd_tap for %s as %s\n",
 778                 name, tap_name);
 779
 780         ret = eth_dev_tap_create(name, tap_name);
 781
 782 leave:
 783         if (ret == -1) {
 784                 RTE_LOG(INFO, PMD, "Failed to create pmd for %s as %s\n",
 785                         name, tap_name);
 786                 tap_unit--;             /* Restore the unit number */
 787         }
 788         rte_kvargs_free(kvlist);
 789
 790         return ret;
 791 }
 792
 793 /* detach a TAP device.
 794  */
 795 static int
 796 rte_pmd_tap_remove(const char *name)
 797 {
 798         struct rte_eth_dev *eth_dev = NULL;
 799         struct pmd_internals *internals;
 800         int i;
 801
 802         RTE_LOG(INFO, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
 803                 rte_socket_id());
 804
 805         /* find the ethdev entry */
 806         eth_dev = rte_eth_dev_allocated(name);
 807         if (!eth_dev)
 808                 return 0;
 809
 810         internals = eth_dev->data->dev_private;
 811         for (i = 0; i < internals->nb_queues; i++)
 812                 if (internals->fds[i] != -1)
 813                         close(internals->fds[i]);
 814
 815         rte_free(eth_dev->data->dev_private);
 816         rte_free(eth_dev->data);
 817
 818         rte_eth_dev_release_port(eth_dev);
 819
 820         return 0;
 821 }
 822
 823 static struct rte_vdev_driver pmd_tap_drv = {
 824         .probe = rte_pmd_tap_probe,
 825         .remove = rte_pmd_tap_remove,
 826 };
 827 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
 828 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
 829 RTE_PMD_REGISTER_PARAM_STRING(net_tap, "iface=<string>,speed=N");