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_atomic.h>
  35 #include <rte_branch_prediction.h>
  36 #include <rte_common.h>
  37 #include <rte_mbuf.h>
  38 #include <rte_ethdev.h>
  39 #include <rte_malloc.h>
  40 #include <rte_vdev.h>
  41 #include <rte_kvargs.h>
  42 #include <rte_net.h>
  43
  44 #include <sys/types.h>
  45 #include <sys/stat.h>
  46 #include <sys/socket.h>
  47 #include <sys/ioctl.h>
  48 #include <sys/utsname.h>
  49 #include <sys/mman.h>
  50 #include <errno.h>
  51 #include <signal.h>
  52 #include <stdint.h>
  53 #include <sys/uio.h>
  54 #include <unistd.h>
  55 #include <arpa/inet.h>
  56 #include <net/if.h>
  57 #include <linux/if_tun.h>
  58 #include <linux/if_ether.h>
  59 #include <linux/version.h>
  60 #include <fcntl.h>
  61
  62 #include <rte_eth_tap.h>
  63 #include <tap_flow.h>
  64 #include <tap_tcmsgs.h>
  65
  66 /* Linux based path to the TUN device */
  67 #define TUN_TAP_DEV_PATH        "/dev/net/tun"
  68 #define DEFAULT_TAP_NAME        "dtap"
  69
  70 #define ETH_TAP_IFACE_ARG       "iface"
  71 #define ETH_TAP_SPEED_ARG       "speed"
  72 #define ETH_TAP_REMOTE_ARG      "remote"
  73
  74 #ifdef IFF_MULTI_QUEUE
  75 #define RTE_PMD_TAP_MAX_QUEUES  16
  76 #else
  77 #define RTE_PMD_TAP_MAX_QUEUES  1
  78 #endif
  79
  80 #define FLOWER_KERNEL_VERSION KERNEL_VERSION(4, 2, 0)
  81 #define FLOWER_VLAN_KERNEL_VERSION KERNEL_VERSION(4, 9, 0)
  82
  83 static struct rte_vdev_driver pmd_tap_drv;
  84
  85 static const char *valid_arguments[] = {
  86         ETH_TAP_IFACE_ARG,
  87         ETH_TAP_SPEED_ARG,
  88         ETH_TAP_REMOTE_ARG,
  89         NULL
  90 };
  91
  92 static int tap_unit;
  93
  94 static volatile uint32_t tap_trigger;   /* Rx trigger */
  95
  96 static struct rte_eth_link pmd_link = {
  97         .link_speed = ETH_SPEED_NUM_10G,
  98         .link_duplex = ETH_LINK_FULL_DUPLEX,
  99         .link_status = ETH_LINK_DOWN,
 100         .link_autoneg = ETH_LINK_SPEED_AUTONEG
 101 };
 102
 103 static void
 104 tap_trigger_cb(int sig __rte_unused)
 105 {
 106         /* Valid trigger values are nonzero */
 107         tap_trigger = (tap_trigger + 1) | 0x80000000;
 108 }
 109
 110 static int
 111 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 112           struct ifreq *ifr, int set);
 113
 114 /* Tun/Tap allocation routine
 115  *
 116  * name is the number of the interface to use, unless NULL to take the host
 117  * supplied name.
 118  */
 119 static int
 120 tun_alloc(struct pmd_internals *pmd, uint16_t qid)
 121 {
 122         struct ifreq ifr;
 123 #ifdef IFF_MULTI_QUEUE
 124         unsigned int features;
 125 #endif
 126         int fd;
 127
 128         memset(&ifr, 0, sizeof(struct ifreq));
 129
 130         /*
 131          * Do not set IFF_NO_PI as packet information header will be needed
 132          * to check if a received packet has been truncated.
 133          */
 134         ifr.ifr_flags = IFF_TAP;
 135         snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
 136
 137         RTE_LOG(DEBUG, PMD, "ifr_name '%s'\n", ifr.ifr_name);
 138
 139         fd = open(TUN_TAP_DEV_PATH, O_RDWR);
 140         if (fd < 0) {
 141                 RTE_LOG(ERR, PMD, "Unable to create TAP interface");
 142                 goto error;
 143         }
 144
 145 #ifdef IFF_MULTI_QUEUE
 146         /* Grab the TUN features to verify we can work multi-queue */
 147         if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
 148                 RTE_LOG(ERR, PMD, "TAP unable to get TUN/TAP features\n");
 149                 goto error;
 150         }
 151         RTE_LOG(DEBUG, PMD, "  TAP Features %08x\n", features);
 152
 153         if (features & IFF_MULTI_QUEUE) {
 154                 RTE_LOG(DEBUG, PMD, "  Multi-queue support for %d queues\n",
 155                         RTE_PMD_TAP_MAX_QUEUES);
 156                 ifr.ifr_flags |= IFF_MULTI_QUEUE;
 157         } else
 158 #endif
 159         {
 160                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 161                 RTE_LOG(DEBUG, PMD, "  Single queue only support\n");
 162         }
 163
 164         /* Set the TUN/TAP configuration and set the name if needed */
 165         if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
 166                 RTE_LOG(WARNING, PMD,
 167                         "Unable to set TUNSETIFF for %s\n",
 168                         ifr.ifr_name);
 169                 perror("TUNSETIFF");
 170                 goto error;
 171         }
 172
 173         /* Always set the file descriptor to non-blocking */
 174         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
 175                 RTE_LOG(WARNING, PMD,
 176                         "Unable to set %s to nonblocking\n",
 177                         ifr.ifr_name);
 178                 perror("F_SETFL, NONBLOCK");
 179                 goto error;
 180         }
 181
 182         /* Set up trigger to optimize empty Rx bursts */
 183         errno = 0;
 184         do {
 185                 struct sigaction sa;
 186                 int flags = fcntl(fd, F_GETFL);
 187
 188                 if (flags == -1 || sigaction(SIGIO, NULL, &sa) == -1)
 189                         break;
 190                 if (sa.sa_handler != tap_trigger_cb) {
 191                         /*
 192                          * Make sure SIGIO is not already taken. This is done
 193                          * as late as possible to leave the application a
 194                          * chance to set up its own signal handler first.
 195                          */
 196                         if (sa.sa_handler != SIG_IGN &&
 197                             sa.sa_handler != SIG_DFL) {
 198                                 errno = EBUSY;
 199                                 break;
 200                         }
 201                         sa = (struct sigaction){
 202                                 .sa_flags = SA_RESTART,
 203                                 .sa_handler = tap_trigger_cb,
 204                         };
 205                         if (sigaction(SIGIO, &sa, NULL) == -1)
 206                                 break;
 207                 }
 208                 /* Enable SIGIO on file descriptor */
 209                 fcntl(fd, F_SETFL, flags | O_ASYNC);
 210                 fcntl(fd, F_SETOWN, getpid());
 211         } while (0);
 212         if (errno) {
 213                 /* Disable trigger globally in case of error */
 214                 tap_trigger = 0;
 215                 RTE_LOG(WARNING, PMD, "Rx trigger disabled: %s\n",
 216                         strerror(errno));
 217         }
 218
 219         if (qid == 0) {
 220                 struct ifreq ifr;
 221
 222                 if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0) < 0)
 223                         goto error;
 224                 rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data,
 225                            ETHER_ADDR_LEN);
 226
 227                 pmd->if_index = if_nametoindex(pmd->name);
 228                 if (!pmd->if_index) {
 229                         RTE_LOG(ERR, PMD,
 230                                 "Could not find ifindex for %s: rte_flow won't be usable.\n",
 231                                 pmd->name);
 232                         return fd;
 233                 }
 234                 if (!pmd->flower_support)
 235                         return fd;
 236                 if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) {
 237                         RTE_LOG(ERR, PMD,
 238                                 "Could not create multiq qdisc for %s: rte_flow won't be usable.\n",
 239                                 pmd->name);
 240                         return fd;
 241                 }
 242                 if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) {
 243                         RTE_LOG(ERR, PMD,
 244                                 "Could not create multiq qdisc for %s: rte_flow won't be usable.\n",
 245                                 pmd->name);
 246                         return fd;
 247                 }
 248                 if (pmd->remote_if_index) {
 249                         /*
 250                          * Flush usually returns negative value because it tries
 251                          * to delete every QDISC (and on a running device, one
 252                          * QDISC at least is needed). Ignore negative return
 253                          * value.
 254                          */
 255                         qdisc_flush(pmd->nlsk_fd, pmd->remote_if_index);
 256                         if (qdisc_create_ingress(pmd->nlsk_fd,
 257                                                  pmd->remote_if_index) < 0)
 258                                 goto remote_fail;
 259                         LIST_INIT(&pmd->implicit_flows);
 260                         if (tap_flow_implicit_create(
 261                                     pmd, TAP_REMOTE_LOCAL_MAC) < 0)
 262                                 goto remote_fail;
 263                         if (tap_flow_implicit_create(
 264                                     pmd, TAP_REMOTE_BROADCAST) < 0)
 265                                 goto remote_fail;
 266                         if (tap_flow_implicit_create(
 267                                     pmd, TAP_REMOTE_BROADCASTV6) < 0)
 268                                 goto remote_fail;
 269                         if (tap_flow_implicit_create(
 270                                     pmd, TAP_REMOTE_TX) < 0)
 271                                 goto remote_fail;
 272                 }
 273         }
 274
 275         return fd;
 276
 277 remote_fail:
 278         RTE_LOG(ERR, PMD,
 279                 "Could not set up remote flow rules for %s: remote disabled.\n",
 280                 pmd->name);
 281         pmd->remote_if_index = 0;
 282         tap_flow_implicit_flush(pmd, NULL);
 283         return fd;
 284
 285 error:
 286         if (fd > 0)
 287                 close(fd);
 288         return -1;
 289 }
 290
 291 /* Callback to handle the rx burst of packets to the correct interface and
 292  * file descriptor(s) in a multi-queue setup.
 293  */
 294 static uint16_t
 295 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 296 {
 297         struct rx_queue *rxq = queue;
 298         uint16_t num_rx;
 299         unsigned long num_rx_bytes = 0;
 300         uint32_t trigger = tap_trigger;
 301
 302         if (trigger == rxq->trigger_seen)
 303                 return 0;
 304         if (trigger)
 305                 rxq->trigger_seen = trigger;
 306         rte_compiler_barrier();
 307         for (num_rx = 0; num_rx < nb_pkts; ) {
 308                 struct rte_mbuf *mbuf = rxq->pool;
 309                 struct rte_mbuf *seg = NULL;
 310                 struct rte_mbuf *new_tail = NULL;
 311                 uint16_t data_off = rte_pktmbuf_headroom(mbuf);
 312                 int len;
 313
 314                 len = readv(rxq->fd, *rxq->iovecs,
 315                             1 + (rxq->rxmode->enable_scatter ?
 316                                  rxq->nb_rx_desc : 1));
 317                 if (len < (int)sizeof(struct tun_pi))
 318                         break;
 319
 320                 /* Packet couldn't fit in the provided mbuf */
 321                 if (unlikely(rxq->pi.flags & TUN_PKT_STRIP)) {
 322                         rxq->stats.ierrors++;
 323                         continue;
 324                 }
 325
 326                 len -= sizeof(struct tun_pi);
 327
 328                 mbuf->pkt_len = len;
 329                 mbuf->port = rxq->in_port;
 330                 while (1) {
 331                         struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp);
 332
 333                         if (unlikely(!buf)) {
 334                                 rxq->stats.rx_nombuf++;
 335                                 /* No new buf has been allocated: do nothing */
 336                                 if (!new_tail || !seg)
 337                                         goto end;
 338
 339                                 seg->next = NULL;
 340                                 rte_pktmbuf_free(mbuf);
 341
 342                                 goto end;
 343                         }
 344                         seg = seg ? seg->next : mbuf;
 345                         if (rxq->pool == mbuf)
 346                                 rxq->pool = buf;
 347                         if (new_tail)
 348                                 new_tail->next = buf;
 349                         new_tail = buf;
 350                         new_tail->next = seg->next;
 351
 352                         /* iovecs[0] is reserved for packet info (pi) */
 353                         (*rxq->iovecs)[mbuf->nb_segs].iov_len =
 354                                 buf->buf_len - data_off;
 355                         (*rxq->iovecs)[mbuf->nb_segs].iov_base =
 356                                 (char *)buf->buf_addr + data_off;
 357
 358                         seg->data_len = RTE_MIN(seg->buf_len - data_off, len);
 359                         seg->data_off = data_off;
 360
 361                         len -= seg->data_len;
 362                         if (len <= 0)
 363                                 break;
 364                         mbuf->nb_segs++;
 365                         /* First segment has headroom, not the others */
 366                         data_off = 0;
 367                 }
 368                 seg->next = NULL;
 369                 mbuf->packet_type = rte_net_get_ptype(mbuf, NULL,
 370                                                       RTE_PTYPE_ALL_MASK);
 371
 372                 /* account for the receive frame */
 373                 bufs[num_rx++] = mbuf;
 374                 num_rx_bytes += mbuf->pkt_len;
 375         }
 376 end:
 377         rxq->stats.ipackets += num_rx;
 378         rxq->stats.ibytes += num_rx_bytes;
 379
 380         return num_rx;
 381 }
 382
 383 /* Callback to handle sending packets from the tap interface
 384  */
 385 static uint16_t
 386 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 387 {
 388         struct tx_queue *txq = queue;
 389         uint16_t num_tx = 0;
 390         unsigned long num_tx_bytes = 0;
 391         uint32_t max_size;
 392         int i;
 393
 394         if (unlikely(nb_pkts == 0))
 395                 return 0;
 396
 397         max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4);
 398         for (i = 0; i < nb_pkts; i++) {
 399                 struct rte_mbuf *mbuf = bufs[num_tx];
 400                 struct iovec iovecs[mbuf->nb_segs + 1];
 401                 struct tun_pi pi = { .flags = 0 };
 402                 struct rte_mbuf *seg = mbuf;
 403                 int n;
 404                 int j;
 405
 406                 /* stats.errs will be incremented */
 407                 if (rte_pktmbuf_pkt_len(mbuf) > max_size)
 408                         break;
 409
 410                 iovecs[0].iov_base = &pi;
 411                 iovecs[0].iov_len = sizeof(pi);
 412                 for (j = 1; j <= mbuf->nb_segs; j++) {
 413                         iovecs[j].iov_len = rte_pktmbuf_data_len(seg);
 414                         iovecs[j].iov_base =
 415                                 rte_pktmbuf_mtod(seg, void *);
 416                         seg = seg->next;
 417                 }
 418                 /* copy the tx frame data */
 419                 n = writev(txq->fd, iovecs, mbuf->nb_segs + 1);
 420                 if (n <= 0)
 421                         break;
 422
 423                 num_tx++;
 424                 num_tx_bytes += mbuf->pkt_len;
 425                 rte_pktmbuf_free(mbuf);
 426         }
 427
 428         txq->stats.opackets += num_tx;
 429         txq->stats.errs += nb_pkts - num_tx;
 430         txq->stats.obytes += num_tx_bytes;
 431
 432         return num_tx;
 433 }
 434
 435 static int
 436 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 437           struct ifreq *ifr, int set)
 438 {
 439         short req_flags = ifr->ifr_flags;
 440         int remote = !!pmd->remote_if_index;
 441
 442         /*
 443          * If there is a remote netdevice, apply ioctl on it, then apply it on
 444          * the tap netdevice.
 445          */
 446 apply:
 447         if (remote)
 448                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->remote_iface);
 449         else
 450                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->name);
 451         switch (request) {
 452         case SIOCSIFFLAGS:
 453                 /* fetch current flags to leave other flags untouched */
 454                 if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
 455                         goto error;
 456                 if (set)
 457                         ifr->ifr_flags |= req_flags;
 458                 else
 459                         ifr->ifr_flags &= ~req_flags;
 460                 break;
 461         case SIOCGIFHWADDR:
 462                 /* Set remote MAC on the tap netdevice */
 463                 if (!remote && pmd->remote_if_index) {
 464                         request = SIOCSIFHWADDR;
 465                         goto apply;
 466                 }
 467                 break;
 468         case SIOCSIFHWADDR:
 469         case SIOCSIFMTU:
 470                 break;
 471         default:
 472                 RTE_LOG(WARNING, PMD, "%s: ioctl() called with wrong arg\n",
 473                         pmd->name);
 474                 return -EINVAL;
 475         }
 476         if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
 477                 goto error;
 478         if (remote--)
 479                 goto apply;
 480         return 0;
 481
 482 error:
 483         RTE_LOG(ERR, PMD, "%s: ioctl(%lu) failed with error: %s\n",
 484                 ifr->ifr_name, request, strerror(errno));
 485         return -errno;
 486 }
 487
 488 static int
 489 tap_link_set_down(struct rte_eth_dev *dev)
 490 {
 491         struct pmd_internals *pmd = dev->data->dev_private;
 492         struct ifreq ifr = { .ifr_flags = IFF_UP };
 493
 494         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 495         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0);
 496 }
 497
 498 static int
 499 tap_link_set_up(struct rte_eth_dev *dev)
 500 {
 501         struct pmd_internals *pmd = dev->data->dev_private;
 502         struct ifreq ifr = { .ifr_flags = IFF_UP };
 503
 504         dev->data->dev_link.link_status = ETH_LINK_UP;
 505         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1);
 506 }
 507
 508 static int
 509 tap_dev_start(struct rte_eth_dev *dev)
 510 {
 511         return tap_link_set_up(dev);
 512 }
 513
 514 /* This function gets called when the current port gets stopped.
 515  */
 516 static void
 517 tap_dev_stop(struct rte_eth_dev *dev)
 518 {
 519         tap_link_set_down(dev);
 520 }
 521
 522 static int
 523 tap_dev_configure(struct rte_eth_dev *dev __rte_unused)
 524 {
 525         return 0;
 526 }
 527
 528 static uint32_t
 529 tap_dev_speed_capa(void)
 530 {
 531         uint32_t speed = pmd_link.link_speed;
 532         uint32_t capa = 0;
 533
 534         if (speed >= ETH_SPEED_NUM_10M)
 535                 capa |= ETH_LINK_SPEED_10M;
 536         if (speed >= ETH_SPEED_NUM_100M)
 537                 capa |= ETH_LINK_SPEED_100M;
 538         if (speed >= ETH_SPEED_NUM_1G)
 539                 capa |= ETH_LINK_SPEED_1G;
 540         if (speed >= ETH_SPEED_NUM_5G)
 541                 capa |= ETH_LINK_SPEED_2_5G;
 542         if (speed >= ETH_SPEED_NUM_5G)
 543                 capa |= ETH_LINK_SPEED_5G;
 544         if (speed >= ETH_SPEED_NUM_10G)
 545                 capa |= ETH_LINK_SPEED_10G;
 546         if (speed >= ETH_SPEED_NUM_20G)
 547                 capa |= ETH_LINK_SPEED_20G;
 548         if (speed >= ETH_SPEED_NUM_25G)
 549                 capa |= ETH_LINK_SPEED_25G;
 550         if (speed >= ETH_SPEED_NUM_40G)
 551                 capa |= ETH_LINK_SPEED_40G;
 552         if (speed >= ETH_SPEED_NUM_50G)
 553                 capa |= ETH_LINK_SPEED_50G;
 554         if (speed >= ETH_SPEED_NUM_56G)
 555                 capa |= ETH_LINK_SPEED_56G;
 556         if (speed >= ETH_SPEED_NUM_100G)
 557                 capa |= ETH_LINK_SPEED_100G;
 558
 559         return capa;
 560 }
 561
 562 static void
 563 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 564 {
 565         struct pmd_internals *internals = dev->data->dev_private;
 566
 567         dev_info->if_index = internals->if_index;
 568         dev_info->max_mac_addrs = 1;
 569         dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
 570         dev_info->max_rx_queues = internals->nb_queues;
 571         dev_info->max_tx_queues = internals->nb_queues;
 572         dev_info->min_rx_bufsize = 0;
 573         dev_info->pci_dev = NULL;
 574         dev_info->speed_capa = tap_dev_speed_capa();
 575 }
 576
 577 static void
 578 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
 579 {
 580         unsigned int i, imax;
 581         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 582         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 583         unsigned long rx_nombuf = 0, ierrors = 0;
 584         const struct pmd_internals *pmd = dev->data->dev_private;
 585
 586         imax = (pmd->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 587                 pmd->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 588
 589         for (i = 0; i < imax; i++) {
 590                 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
 591                 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
 592                 rx_total += tap_stats->q_ipackets[i];
 593                 rx_bytes_total += tap_stats->q_ibytes[i];
 594                 rx_nombuf += pmd->rxq[i].stats.rx_nombuf;
 595                 ierrors += pmd->rxq[i].stats.ierrors;
 596
 597                 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
 598                 tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
 599                 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
 600                 tx_total += tap_stats->q_opackets[i];
 601                 tx_err_total += tap_stats->q_errors[i];
 602                 tx_bytes_total += tap_stats->q_obytes[i];
 603         }
 604
 605         tap_stats->ipackets = rx_total;
 606         tap_stats->ibytes = rx_bytes_total;
 607         tap_stats->ierrors = ierrors;
 608         tap_stats->rx_nombuf = rx_nombuf;
 609         tap_stats->opackets = tx_total;
 610         tap_stats->oerrors = tx_err_total;
 611         tap_stats->obytes = tx_bytes_total;
 612 }
 613
 614 static void
 615 tap_stats_reset(struct rte_eth_dev *dev)
 616 {
 617         int i;
 618         struct pmd_internals *pmd = dev->data->dev_private;
 619
 620         for (i = 0; i < pmd->nb_queues; i++) {
 621                 pmd->rxq[i].stats.ipackets = 0;
 622                 pmd->rxq[i].stats.ibytes = 0;
 623                 pmd->rxq[i].stats.ierrors = 0;
 624                 pmd->rxq[i].stats.rx_nombuf = 0;
 625
 626                 pmd->txq[i].stats.opackets = 0;
 627                 pmd->txq[i].stats.errs = 0;
 628                 pmd->txq[i].stats.obytes = 0;
 629         }
 630 }
 631
 632 static void
 633 tap_dev_close(struct rte_eth_dev *dev __rte_unused)
 634 {
 635         int i;
 636         struct pmd_internals *internals = dev->data->dev_private;
 637
 638         tap_link_set_down(dev);
 639         tap_flow_flush(dev, NULL);
 640         tap_flow_implicit_flush(internals, NULL);
 641
 642         for (i = 0; i < internals->nb_queues; i++) {
 643                 if (internals->rxq[i].fd != -1)
 644                         close(internals->rxq[i].fd);
 645                 internals->rxq[i].fd = -1;
 646                 internals->txq[i].fd = -1;
 647         }
 648 }
 649
 650 static void
 651 tap_rx_queue_release(void *queue)
 652 {
 653         struct rx_queue *rxq = queue;
 654
 655         if (rxq && (rxq->fd > 0)) {
 656                 close(rxq->fd);
 657                 rxq->fd = -1;
 658                 rte_pktmbuf_free(rxq->pool);
 659                 rte_free(rxq->iovecs);
 660                 rxq->pool = NULL;
 661                 rxq->iovecs = NULL;
 662         }
 663 }
 664
 665 static void
 666 tap_tx_queue_release(void *queue)
 667 {
 668         struct tx_queue *txq = queue;
 669
 670         if (txq && (txq->fd > 0)) {
 671                 close(txq->fd);
 672                 txq->fd = -1;
 673         }
 674 }
 675
 676 static int
 677 tap_link_update(struct rte_eth_dev *dev __rte_unused,
 678                 int wait_to_complete __rte_unused)
 679 {
 680         return 0;
 681 }
 682
 683 static void
 684 tap_promisc_enable(struct rte_eth_dev *dev)
 685 {
 686         struct pmd_internals *pmd = dev->data->dev_private;
 687         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 688
 689         dev->data->promiscuous = 1;
 690         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1);
 691         if (pmd->remote_if_index)
 692                 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC);
 693 }
 694
 695 static void
 696 tap_promisc_disable(struct rte_eth_dev *dev)
 697 {
 698         struct pmd_internals *pmd = dev->data->dev_private;
 699         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 700
 701         dev->data->promiscuous = 0;
 702         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0);
 703         if (pmd->remote_if_index)
 704                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC);
 705 }
 706
 707 static void
 708 tap_allmulti_enable(struct rte_eth_dev *dev)
 709 {
 710         struct pmd_internals *pmd = dev->data->dev_private;
 711         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 712
 713         dev->data->all_multicast = 1;
 714         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1);
 715         if (pmd->remote_if_index)
 716                 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI);
 717 }
 718
 719 static void
 720 tap_allmulti_disable(struct rte_eth_dev *dev)
 721 {
 722         struct pmd_internals *pmd = dev->data->dev_private;
 723         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 724
 725         dev->data->all_multicast = 0;
 726         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0);
 727         if (pmd->remote_if_index)
 728                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI);
 729 }
 730
 731
 732 static void
 733 tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
 734 {
 735         struct pmd_internals *pmd = dev->data->dev_private;
 736         struct ifreq ifr;
 737
 738         if (is_zero_ether_addr(mac_addr)) {
 739                 RTE_LOG(ERR, PMD, "%s: can't set an empty MAC address\n",
 740                         dev->data->name);
 741                 return;
 742         }
 743
 744         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
 745         rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETHER_ADDR_LEN);
 746         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1) < 0)
 747                 return;
 748         rte_memcpy(&pmd->eth_addr, mac_addr, ETHER_ADDR_LEN);
 749 }
 750
 751 static int
 752 tap_setup_queue(struct rte_eth_dev *dev,
 753                 struct pmd_internals *internals,
 754                 uint16_t qid)
 755 {
 756         struct pmd_internals *pmd = dev->data->dev_private;
 757         struct rx_queue *rx = &internals->rxq[qid];
 758         struct tx_queue *tx = &internals->txq[qid];
 759         int fd;
 760
 761         fd = rx->fd;
 762         if (fd < 0) {
 763                 fd = tx->fd;
 764                 if (fd < 0) {
 765                         RTE_LOG(INFO, PMD, "Add queue to TAP %s for qid %d\n",
 766                                 pmd->name, qid);
 767                         fd = tun_alloc(pmd, qid);
 768                         if (fd < 0) {
 769                                 RTE_LOG(ERR, PMD, "tun_alloc(%s, %d) failed\n",
 770                                         pmd->name, qid);
 771                                 return -1;
 772                         }
 773                         if (qid == 0) {
 774                                 struct ifreq ifr;
 775
 776                                 ifr.ifr_mtu = dev->data->mtu;
 777                                 if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1) < 0) {
 778                                         close(fd);
 779                                         return -1;
 780                                 }
 781                         }
 782                 }
 783         }
 784
 785         rx->fd = fd;
 786         tx->fd = fd;
 787         tx->mtu = &dev->data->mtu;
 788         rx->rxmode = &dev->data->dev_conf.rxmode;
 789
 790         return fd;
 791 }
 792
 793 static int
 794 rx_setup_queue(struct rte_eth_dev *dev,
 795                 struct pmd_internals *internals,
 796                 uint16_t qid)
 797 {
 798         dev->data->rx_queues[qid] = &internals->rxq[qid];
 799
 800         return tap_setup_queue(dev, internals, qid);
 801 }
 802
 803 static int
 804 tx_setup_queue(struct rte_eth_dev *dev,
 805                 struct pmd_internals *internals,
 806                 uint16_t qid)
 807 {
 808         dev->data->tx_queues[qid] = &internals->txq[qid];
 809
 810         return tap_setup_queue(dev, internals, qid);
 811 }
 812
 813 static int
 814 tap_rx_queue_setup(struct rte_eth_dev *dev,
 815                    uint16_t rx_queue_id,
 816                    uint16_t nb_rx_desc,
 817                    unsigned int socket_id,
 818                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 819                    struct rte_mempool *mp)
 820 {
 821         struct pmd_internals *internals = dev->data->dev_private;
 822         struct rx_queue *rxq = &internals->rxq[rx_queue_id];
 823         struct rte_mbuf **tmp = &rxq->pool;
 824         struct iovec (*iovecs)[nb_rx_desc + 1];
 825         int data_off = RTE_PKTMBUF_HEADROOM;
 826         uint16_t buf_size;
 827         int ret = 0;
 828         int fd;
 829         int i;
 830
 831         if ((rx_queue_id >= internals->nb_queues) || !mp) {
 832                 RTE_LOG(WARNING, PMD,
 833                         "nb_queues %d too small or mempool NULL\n",
 834                         internals->nb_queues);
 835                 return -1;
 836         }
 837
 838         rxq->mp = mp;
 839         rxq->trigger_seen = 1; /* force initial burst */
 840         rxq->in_port = dev->data->port_id;
 841         rxq->nb_rx_desc = nb_rx_desc;
 842         iovecs = rte_zmalloc_socket(dev->data->name, sizeof(*iovecs), 0,
 843                                     socket_id);
 844         if (!iovecs) {
 845                 RTE_LOG(WARNING, PMD,
 846                         "%s: Couldn't allocate %d RX descriptors\n",
 847                         dev->data->name, nb_rx_desc);
 848                 return -ENOMEM;
 849         }
 850         rxq->iovecs = iovecs;
 851
 852         /* Now get the space available for data in the mbuf */
 853         buf_size = (uint16_t)(rte_pktmbuf_data_room_size(mp) -
 854                                 RTE_PKTMBUF_HEADROOM);
 855
 856         if (buf_size < ETH_FRAME_LEN) {
 857                 RTE_LOG(WARNING, PMD,
 858                         "%s: %d bytes will not fit in mbuf (%d bytes)\n",
 859                         dev->data->name, ETH_FRAME_LEN, buf_size);
 860                 ret = -ENOMEM;
 861                 goto error;
 862         }
 863
 864         fd = rx_setup_queue(dev, internals, rx_queue_id);
 865         if (fd == -1) {
 866                 ret = fd;
 867                 goto error;
 868         }
 869
 870         (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
 871         (*rxq->iovecs)[0].iov_base = &rxq->pi;
 872
 873         for (i = 1; i <= nb_rx_desc; i++) {
 874                 *tmp = rte_pktmbuf_alloc(rxq->mp);
 875                 if (!*tmp) {
 876                         RTE_LOG(WARNING, PMD,
 877                                 "%s: couldn't allocate memory for queue %d\n",
 878                                 dev->data->name, rx_queue_id);
 879                         ret = -ENOMEM;
 880                         goto error;
 881                 }
 882                 (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off;
 883                 (*rxq->iovecs)[i].iov_base =
 884                         (char *)(*tmp)->buf_addr + data_off;
 885                 data_off = 0;
 886                 tmp = &(*tmp)->next;
 887         }
 888
 889         RTE_LOG(DEBUG, PMD, "  RX TAP device name %s, qid %d on fd %d\n",
 890                 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
 891
 892         return 0;
 893
 894 error:
 895         rte_pktmbuf_free(rxq->pool);
 896         rxq->pool = NULL;
 897         rte_free(rxq->iovecs);
 898         rxq->iovecs = NULL;
 899         return ret;
 900 }
 901
 902 static int
 903 tap_tx_queue_setup(struct rte_eth_dev *dev,
 904                    uint16_t tx_queue_id,
 905                    uint16_t nb_tx_desc __rte_unused,
 906                    unsigned int socket_id __rte_unused,
 907                    const struct rte_eth_txconf *tx_conf __rte_unused)
 908 {
 909         struct pmd_internals *internals = dev->data->dev_private;
 910         int ret;
 911
 912         if (tx_queue_id >= internals->nb_queues)
 913                 return -1;
 914
 915         ret = tx_setup_queue(dev, internals, tx_queue_id);
 916         if (ret == -1)
 917                 return -1;
 918
 919         RTE_LOG(DEBUG, PMD, "  TX TAP device name %s, qid %d on fd %d\n",
 920                 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
 921
 922         return 0;
 923 }
 924
 925 static int
 926 tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 927 {
 928         struct pmd_internals *pmd = dev->data->dev_private;
 929         struct ifreq ifr = { .ifr_mtu = mtu };
 930         int err = 0;
 931
 932         err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1);
 933         if (!err)
 934                 dev->data->mtu = mtu;
 935
 936         return err;
 937 }
 938
 939 static int
 940 tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
 941                      struct ether_addr *mc_addr_set __rte_unused,
 942                      uint32_t nb_mc_addr __rte_unused)
 943 {
 944         /*
 945          * Nothing to do actually: the tap has no filtering whatsoever, every
 946          * packet is received.
 947          */
 948         return 0;
 949 }
 950
 951 static const uint32_t*
 952 tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused)
 953 {
 954         static const uint32_t ptypes[] = {
 955                 RTE_PTYPE_INNER_L2_ETHER,
 956                 RTE_PTYPE_INNER_L2_ETHER_VLAN,
 957                 RTE_PTYPE_INNER_L2_ETHER_QINQ,
 958                 RTE_PTYPE_INNER_L3_IPV4,
 959                 RTE_PTYPE_INNER_L3_IPV4_EXT,
 960                 RTE_PTYPE_INNER_L3_IPV6,
 961                 RTE_PTYPE_INNER_L3_IPV6_EXT,
 962                 RTE_PTYPE_INNER_L4_FRAG,
 963                 RTE_PTYPE_INNER_L4_UDP,
 964                 RTE_PTYPE_INNER_L4_TCP,
 965                 RTE_PTYPE_INNER_L4_SCTP,
 966                 RTE_PTYPE_L2_ETHER,
 967                 RTE_PTYPE_L2_ETHER_VLAN,
 968                 RTE_PTYPE_L2_ETHER_QINQ,
 969                 RTE_PTYPE_L3_IPV4,
 970                 RTE_PTYPE_L3_IPV4_EXT,
 971                 RTE_PTYPE_L3_IPV6_EXT,
 972                 RTE_PTYPE_L3_IPV6,
 973                 RTE_PTYPE_L4_FRAG,
 974                 RTE_PTYPE_L4_UDP,
 975                 RTE_PTYPE_L4_TCP,
 976                 RTE_PTYPE_L4_SCTP,
 977         };
 978
 979         return ptypes;
 980 }
 981
 982 static int
 983 tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused,
 984                   struct rte_eth_fc_conf *fc_conf)
 985 {
 986         fc_conf->mode = RTE_FC_NONE;
 987         return 0;
 988 }
 989
 990 static int
 991 tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused,
 992                   struct rte_eth_fc_conf *fc_conf)
 993 {
 994         if (fc_conf->mode != RTE_FC_NONE)
 995                 return -ENOTSUP;
 996         return 0;
 997 }
 998
 999 static const struct eth_dev_ops ops = {
1000         .dev_start              = tap_dev_start,
1001         .dev_stop               = tap_dev_stop,
1002         .dev_close              = tap_dev_close,
1003         .dev_configure          = tap_dev_configure,
1004         .dev_infos_get          = tap_dev_info,
1005         .rx_queue_setup         = tap_rx_queue_setup,
1006         .tx_queue_setup         = tap_tx_queue_setup,
1007         .rx_queue_release       = tap_rx_queue_release,
1008         .tx_queue_release       = tap_tx_queue_release,
1009         .flow_ctrl_get          = tap_flow_ctrl_get,
1010         .flow_ctrl_set          = tap_flow_ctrl_set,
1011         .link_update            = tap_link_update,
1012         .dev_set_link_up        = tap_link_set_up,
1013         .dev_set_link_down      = tap_link_set_down,
1014         .promiscuous_enable     = tap_promisc_enable,
1015         .promiscuous_disable    = tap_promisc_disable,
1016         .allmulticast_enable    = tap_allmulti_enable,
1017         .allmulticast_disable   = tap_allmulti_disable,
1018         .mac_addr_set           = tap_mac_set,
1019         .mtu_set                = tap_mtu_set,
1020         .set_mc_addr_list       = tap_set_mc_addr_list,
1021         .stats_get              = tap_stats_get,
1022         .stats_reset            = tap_stats_reset,
1023         .dev_supported_ptypes_get = tap_dev_supported_ptypes_get,
1024         .filter_ctrl            = tap_dev_filter_ctrl,
1025 };
1026
1027 static int
1028 tap_kernel_support(struct pmd_internals *pmd)
1029 {
1030         struct utsname utsname;
1031         int ver[3];
1032
1033         if (uname(&utsname) == -1 ||
1034             sscanf(utsname.release, "%d.%d.%d",
1035                    &ver[0], &ver[1], &ver[2]) != 3)
1036                 return 0;
1037         if (KERNEL_VERSION(ver[0], ver[1], ver[2]) >= FLOWER_KERNEL_VERSION)
1038                 pmd->flower_support = 1;
1039         if (KERNEL_VERSION(ver[0], ver[1], ver[2]) >=
1040             FLOWER_VLAN_KERNEL_VERSION)
1041                 pmd->flower_vlan_support = 1;
1042         return 1;
1043 }
1044
1045 static int
1046 eth_dev_tap_create(const char *name, char *tap_name, char *remote_iface)
1047 {
1048         int numa_node = rte_socket_id();
1049         struct rte_eth_dev *dev = NULL;
1050         struct pmd_internals *pmd = NULL;
1051         struct rte_eth_dev_data *data = NULL;
1052         int i;
1053
1054         RTE_LOG(DEBUG, PMD, "  TAP device on numa %u\n", rte_socket_id());
1055
1056         data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node);
1057         if (!data) {
1058                 RTE_LOG(ERR, PMD, "TAP Failed to allocate data\n");
1059                 goto error_exit;
1060         }
1061
1062         pmd = rte_zmalloc_socket(tap_name, sizeof(*pmd), 0, numa_node);
1063         if (!pmd) {
1064                 RTE_LOG(ERR, PMD, "TAP Unable to allocate internal struct\n");
1065                 goto error_exit;
1066         }
1067
1068         /* name in allocation and data->name must be consistent */
1069         snprintf(data->name, sizeof(data->name), "%s", name);
1070         dev = rte_eth_dev_allocate(name);
1071         if (!dev) {
1072                 RTE_LOG(ERR, PMD, "TAP Unable to allocate device struct\n");
1073                 goto error_exit;
1074         }
1075
1076         snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
1077
1078         pmd->nb_queues = RTE_PMD_TAP_MAX_QUEUES;
1079
1080         pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
1081         if (pmd->ioctl_sock == -1) {
1082                 RTE_LOG(ERR, PMD,
1083                         "TAP Unable to get a socket for management: %s\n",
1084                         strerror(errno));
1085                 goto error_exit;
1086         }
1087
1088         /* Setup some default values */
1089         data->dev_private = pmd;
1090         data->port_id = dev->data->port_id;
1091         data->mtu = dev->data->mtu;
1092         data->dev_flags = RTE_ETH_DEV_DETACHABLE;
1093         data->kdrv = RTE_KDRV_NONE;
1094         data->drv_name = pmd_tap_drv.driver.name;
1095         data->numa_node = numa_node;
1096
1097         data->dev_link = pmd_link;
1098         data->mac_addrs = &pmd->eth_addr;
1099         data->nb_rx_queues = pmd->nb_queues;
1100         data->nb_tx_queues = pmd->nb_queues;
1101
1102         dev->data = data;
1103         dev->dev_ops = &ops;
1104         dev->driver = NULL;
1105         dev->rx_pkt_burst = pmd_rx_burst;
1106         dev->tx_pkt_burst = pmd_tx_burst;
1107
1108         /* Presetup the fds to -1 as being not valid */
1109         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1110                 pmd->rxq[i].fd = -1;
1111                 pmd->txq[i].fd = -1;
1112         }
1113
1114         tap_kernel_support(pmd);
1115         if (!pmd->flower_support)
1116                 return 0;
1117         LIST_INIT(&pmd->flows);
1118         /*
1119          * If no netlink socket can be created, then it will fail when
1120          * creating/destroying flow rules.
1121          */
1122         pmd->nlsk_fd = nl_init();
1123         if (strlen(remote_iface)) {
1124                 pmd->remote_if_index = if_nametoindex(remote_iface);
1125                 snprintf(pmd->remote_iface, RTE_ETH_NAME_MAX_LEN,
1126                          "%s", remote_iface);
1127                 if (!pmd->remote_if_index)
1128                         RTE_LOG(ERR, PMD, "Could not find %s ifindex: "
1129                                 "remote interface will remain unconfigured\n",
1130                                 remote_iface);
1131         }
1132
1133         return 0;
1134
1135 error_exit:
1136         RTE_LOG(DEBUG, PMD, "TAP Unable to initialize %s\n", name);
1137
1138         rte_free(data);
1139         rte_free(pmd);
1140
1141         rte_eth_dev_release_port(dev);
1142
1143         return -EINVAL;
1144 }
1145
1146 static int
1147 set_interface_name(const char *key __rte_unused,
1148                    const char *value,
1149                    void *extra_args)
1150 {
1151         char *name = (char *)extra_args;
1152
1153         if (value)
1154                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
1155         else
1156                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
1157                          DEFAULT_TAP_NAME, (tap_unit - 1));
1158
1159         return 0;
1160 }
1161
1162 static int
1163 set_interface_speed(const char *key __rte_unused,
1164                     const char *value,
1165                     void *extra_args)
1166 {
1167         *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G;
1168
1169         return 0;
1170 }
1171
1172 static int
1173 set_remote_iface(const char *key __rte_unused,
1174                  const char *value,
1175                  void *extra_args)
1176 {
1177         char *name = (char *)extra_args;
1178
1179         if (value)
1180                 snprintf(name, RTE_ETH_NAME_MAX_LEN, "%s", value);
1181
1182         return 0;
1183 }
1184
1185 /* Open a TAP interface device.
1186  */
1187 static int
1188 rte_pmd_tap_probe(const char *name, const char *params)
1189 {
1190         int ret;
1191         struct rte_kvargs *kvlist = NULL;
1192         int speed;
1193         char tap_name[RTE_ETH_NAME_MAX_LEN];
1194         char remote_iface[RTE_ETH_NAME_MAX_LEN];
1195
1196         speed = ETH_SPEED_NUM_10G;
1197         snprintf(tap_name, sizeof(tap_name), "%s%d",
1198                  DEFAULT_TAP_NAME, tap_unit++);
1199         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
1200
1201         if (params && (params[0] != '\0')) {
1202                 RTE_LOG(DEBUG, PMD, "paramaters (%s)\n", params);
1203
1204                 kvlist = rte_kvargs_parse(params, valid_arguments);
1205                 if (kvlist) {
1206                         if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) {
1207                                 ret = rte_kvargs_process(kvlist,
1208                                                          ETH_TAP_SPEED_ARG,
1209                                                          &set_interface_speed,
1210                                                          &speed);
1211                                 if (ret == -1)
1212                                         goto leave;
1213                         }
1214
1215                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
1216                                 ret = rte_kvargs_process(kvlist,
1217                                                          ETH_TAP_IFACE_ARG,
1218                                                          &set_interface_name,
1219                                                          tap_name);
1220                                 if (ret == -1)
1221                                         goto leave;
1222                         }
1223
1224                         if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) {
1225                                 ret = rte_kvargs_process(kvlist,
1226                                                          ETH_TAP_REMOTE_ARG,
1227                                                          &set_remote_iface,
1228                                                          remote_iface);
1229                                 if (ret == -1)
1230                                         goto leave;
1231                         }
1232                 }
1233         }
1234         pmd_link.link_speed = speed;
1235
1236         RTE_LOG(NOTICE, PMD, "Initializing pmd_tap for %s as %s\n",
1237                 name, tap_name);
1238
1239         ret = eth_dev_tap_create(name, tap_name, remote_iface);
1240
1241 leave:
1242         if (ret == -1) {
1243                 RTE_LOG(ERR, PMD, "Failed to create pmd for %s as %s\n",
1244                         name, tap_name);
1245                 tap_unit--;             /* Restore the unit number */
1246         }
1247         rte_kvargs_free(kvlist);
1248
1249         return ret;
1250 }
1251
1252 /* detach a TAP device.
1253  */
1254 static int
1255 rte_pmd_tap_remove(const char *name)
1256 {
1257         struct rte_eth_dev *eth_dev = NULL;
1258         struct pmd_internals *internals;
1259         int i;
1260
1261         RTE_LOG(DEBUG, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
1262                 rte_socket_id());
1263
1264         /* find the ethdev entry */
1265         eth_dev = rte_eth_dev_allocated(name);
1266         if (!eth_dev)
1267                 return 0;
1268
1269         internals = eth_dev->data->dev_private;
1270         if (internals->flower_support && internals->nlsk_fd) {
1271                 tap_flow_flush(eth_dev, NULL);
1272                 tap_flow_implicit_flush(internals, NULL);
1273                 nl_final(internals->nlsk_fd);
1274         }
1275         for (i = 0; i < internals->nb_queues; i++)
1276                 if (internals->rxq[i].fd != -1)
1277                         close(internals->rxq[i].fd);
1278
1279         close(internals->ioctl_sock);
1280         rte_free(eth_dev->data->dev_private);
1281         rte_free(eth_dev->data);
1282
1283         rte_eth_dev_release_port(eth_dev);
1284
1285         return 0;
1286 }
1287
1288 static struct rte_vdev_driver pmd_tap_drv = {
1289         .probe = rte_pmd_tap_probe,
1290         .remove = rte_pmd_tap_remove,
1291 };
1292 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
1293 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
1294 RTE_PMD_REGISTER_PARAM_STRING(net_tap, "iface=<string>,speed=N");