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_netlink.h>
  65 #include <tap_tcmsgs.h>
  66
  67 /* Linux based path to the TUN device */
  68 #define TUN_TAP_DEV_PATH        "/dev/net/tun"
  69 #define DEFAULT_TAP_NAME        "dtap"
  70
  71 #define ETH_TAP_IFACE_ARG       "iface"
  72 #define ETH_TAP_SPEED_ARG       "speed"
  73 #define ETH_TAP_REMOTE_ARG      "remote"
  74
  75 #ifdef IFF_MULTI_QUEUE
  76 #define RTE_PMD_TAP_MAX_QUEUES  16
  77 #else
  78 #define RTE_PMD_TAP_MAX_QUEUES  1
  79 #endif
  80
  81 #define FLOWER_KERNEL_VERSION KERNEL_VERSION(4, 2, 0)
  82 #define FLOWER_VLAN_KERNEL_VERSION KERNEL_VERSION(4, 9, 0)
  83
  84 static struct rte_vdev_driver pmd_tap_drv;
  85
  86 static const char *valid_arguments[] = {
  87         ETH_TAP_IFACE_ARG,
  88         ETH_TAP_SPEED_ARG,
  89         ETH_TAP_REMOTE_ARG,
  90         NULL
  91 };
  92
  93 static int tap_unit;
  94
  95 static volatile uint32_t tap_trigger;   /* Rx trigger */
  96
  97 static struct rte_eth_link pmd_link = {
  98         .link_speed = ETH_SPEED_NUM_10G,
  99         .link_duplex = ETH_LINK_FULL_DUPLEX,
 100         .link_status = ETH_LINK_DOWN,
 101         .link_autoneg = ETH_LINK_SPEED_AUTONEG
 102 };
 103
 104 static void
 105 tap_trigger_cb(int sig __rte_unused)
 106 {
 107         /* Valid trigger values are nonzero */
 108         tap_trigger = (tap_trigger + 1) | 0x80000000;
 109 }
 110
 111 static int
 112 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 113           struct ifreq *ifr, int set);
 114
 115 static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
 116
 117 /* Tun/Tap allocation routine
 118  *
 119  * name is the number of the interface to use, unless NULL to take the host
 120  * supplied name.
 121  */
 122 static int
 123 tun_alloc(struct pmd_internals *pmd, uint16_t qid)
 124 {
 125         struct ifreq ifr;
 126 #ifdef IFF_MULTI_QUEUE
 127         unsigned int features;
 128 #endif
 129         int fd;
 130
 131         memset(&ifr, 0, sizeof(struct ifreq));
 132
 133         /*
 134          * Do not set IFF_NO_PI as packet information header will be needed
 135          * to check if a received packet has been truncated.
 136          */
 137         ifr.ifr_flags = IFF_TAP;
 138         snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
 139
 140         RTE_LOG(DEBUG, PMD, "ifr_name '%s'\n", ifr.ifr_name);
 141
 142         fd = open(TUN_TAP_DEV_PATH, O_RDWR);
 143         if (fd < 0) {
 144                 RTE_LOG(ERR, PMD, "Unable to create TAP interface");
 145                 goto error;
 146         }
 147
 148 #ifdef IFF_MULTI_QUEUE
 149         /* Grab the TUN features to verify we can work multi-queue */
 150         if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
 151                 RTE_LOG(ERR, PMD, "TAP unable to get TUN/TAP features\n");
 152                 goto error;
 153         }
 154         RTE_LOG(DEBUG, PMD, "  TAP Features %08x\n", features);
 155
 156         if (features & IFF_MULTI_QUEUE) {
 157                 RTE_LOG(DEBUG, PMD, "  Multi-queue support for %d queues\n",
 158                         RTE_PMD_TAP_MAX_QUEUES);
 159                 ifr.ifr_flags |= IFF_MULTI_QUEUE;
 160         } else
 161 #endif
 162         {
 163                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 164                 RTE_LOG(DEBUG, PMD, "  Single queue only support\n");
 165         }
 166
 167         /* Set the TUN/TAP configuration and set the name if needed */
 168         if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
 169                 RTE_LOG(WARNING, PMD,
 170                         "Unable to set TUNSETIFF for %s\n",
 171                         ifr.ifr_name);
 172                 perror("TUNSETIFF");
 173                 goto error;
 174         }
 175
 176         /* Always set the file descriptor to non-blocking */
 177         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
 178                 RTE_LOG(WARNING, PMD,
 179                         "Unable to set %s to nonblocking\n",
 180                         ifr.ifr_name);
 181                 perror("F_SETFL, NONBLOCK");
 182                 goto error;
 183         }
 184
 185         /* Set up trigger to optimize empty Rx bursts */
 186         errno = 0;
 187         do {
 188                 struct sigaction sa;
 189                 int flags = fcntl(fd, F_GETFL);
 190
 191                 if (flags == -1 || sigaction(SIGIO, NULL, &sa) == -1)
 192                         break;
 193                 if (sa.sa_handler != tap_trigger_cb) {
 194                         /*
 195                          * Make sure SIGIO is not already taken. This is done
 196                          * as late as possible to leave the application a
 197                          * chance to set up its own signal handler first.
 198                          */
 199                         if (sa.sa_handler != SIG_IGN &&
 200                             sa.sa_handler != SIG_DFL) {
 201                                 errno = EBUSY;
 202                                 break;
 203                         }
 204                         sa = (struct sigaction){
 205                                 .sa_flags = SA_RESTART,
 206                                 .sa_handler = tap_trigger_cb,
 207                         };
 208                         if (sigaction(SIGIO, &sa, NULL) == -1)
 209                                 break;
 210                 }
 211                 /* Enable SIGIO on file descriptor */
 212                 fcntl(fd, F_SETFL, flags | O_ASYNC);
 213                 fcntl(fd, F_SETOWN, getpid());
 214         } while (0);
 215         if (errno) {
 216                 /* Disable trigger globally in case of error */
 217                 tap_trigger = 0;
 218                 RTE_LOG(WARNING, PMD, "Rx trigger disabled: %s\n",
 219                         strerror(errno));
 220         }
 221
 222         if (qid == 0) {
 223                 struct ifreq ifr;
 224
 225                 if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0) < 0)
 226                         goto error;
 227                 rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data,
 228                            ETHER_ADDR_LEN);
 229
 230                 pmd->if_index = if_nametoindex(pmd->name);
 231                 if (!pmd->if_index) {
 232                         RTE_LOG(ERR, PMD,
 233                                 "Could not find ifindex for %s: rte_flow won't be usable.\n",
 234                                 pmd->name);
 235                         return fd;
 236                 }
 237                 if (!pmd->flower_support)
 238                         return fd;
 239                 if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) {
 240                         RTE_LOG(ERR, PMD,
 241                                 "Could not create multiq qdisc for %s: rte_flow won't be usable.\n",
 242                                 pmd->name);
 243                         return fd;
 244                 }
 245                 if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) {
 246                         RTE_LOG(ERR, PMD,
 247                                 "Could not create multiq qdisc for %s: rte_flow won't be usable.\n",
 248                                 pmd->name);
 249                         return fd;
 250                 }
 251                 if (pmd->remote_if_index) {
 252                         /*
 253                          * Flush usually returns negative value because it tries
 254                          * to delete every QDISC (and on a running device, one
 255                          * QDISC at least is needed). Ignore negative return
 256                          * value.
 257                          */
 258                         qdisc_flush(pmd->nlsk_fd, pmd->remote_if_index);
 259                         if (qdisc_create_ingress(pmd->nlsk_fd,
 260                                                  pmd->remote_if_index) < 0)
 261                                 goto remote_fail;
 262                         LIST_INIT(&pmd->implicit_flows);
 263                         if (tap_flow_implicit_create(
 264                                     pmd, TAP_REMOTE_LOCAL_MAC) < 0)
 265                                 goto remote_fail;
 266                         if (tap_flow_implicit_create(
 267                                     pmd, TAP_REMOTE_BROADCAST) < 0)
 268                                 goto remote_fail;
 269                         if (tap_flow_implicit_create(
 270                                     pmd, TAP_REMOTE_BROADCASTV6) < 0)
 271                                 goto remote_fail;
 272                         if (tap_flow_implicit_create(
 273                                     pmd, TAP_REMOTE_TX) < 0)
 274                                 goto remote_fail;
 275                 }
 276         }
 277
 278         return fd;
 279
 280 remote_fail:
 281         RTE_LOG(ERR, PMD,
 282                 "Could not set up remote flow rules for %s: remote disabled.\n",
 283                 pmd->name);
 284         pmd->remote_if_index = 0;
 285         tap_flow_implicit_flush(pmd, NULL);
 286         return fd;
 287
 288 error:
 289         if (fd > 0)
 290                 close(fd);
 291         return -1;
 292 }
 293
 294 /* Callback to handle the rx burst of packets to the correct interface and
 295  * file descriptor(s) in a multi-queue setup.
 296  */
 297 static uint16_t
 298 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 299 {
 300         struct rx_queue *rxq = queue;
 301         uint16_t num_rx;
 302         unsigned long num_rx_bytes = 0;
 303         uint32_t trigger = tap_trigger;
 304
 305         if (trigger == rxq->trigger_seen)
 306                 return 0;
 307         if (trigger)
 308                 rxq->trigger_seen = trigger;
 309         rte_compiler_barrier();
 310         for (num_rx = 0; num_rx < nb_pkts; ) {
 311                 struct rte_mbuf *mbuf = rxq->pool;
 312                 struct rte_mbuf *seg = NULL;
 313                 struct rte_mbuf *new_tail = NULL;
 314                 uint16_t data_off = rte_pktmbuf_headroom(mbuf);
 315                 int len;
 316
 317                 len = readv(rxq->fd, *rxq->iovecs,
 318                             1 + (rxq->rxmode->enable_scatter ?
 319                                  rxq->nb_rx_desc : 1));
 320                 if (len < (int)sizeof(struct tun_pi))
 321                         break;
 322
 323                 /* Packet couldn't fit in the provided mbuf */
 324                 if (unlikely(rxq->pi.flags & TUN_PKT_STRIP)) {
 325                         rxq->stats.ierrors++;
 326                         continue;
 327                 }
 328
 329                 len -= sizeof(struct tun_pi);
 330
 331                 mbuf->pkt_len = len;
 332                 mbuf->port = rxq->in_port;
 333                 while (1) {
 334                         struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp);
 335
 336                         if (unlikely(!buf)) {
 337                                 rxq->stats.rx_nombuf++;
 338                                 /* No new buf has been allocated: do nothing */
 339                                 if (!new_tail || !seg)
 340                                         goto end;
 341
 342                                 seg->next = NULL;
 343                                 rte_pktmbuf_free(mbuf);
 344
 345                                 goto end;
 346                         }
 347                         seg = seg ? seg->next : mbuf;
 348                         if (rxq->pool == mbuf)
 349                                 rxq->pool = buf;
 350                         if (new_tail)
 351                                 new_tail->next = buf;
 352                         new_tail = buf;
 353                         new_tail->next = seg->next;
 354
 355                         /* iovecs[0] is reserved for packet info (pi) */
 356                         (*rxq->iovecs)[mbuf->nb_segs].iov_len =
 357                                 buf->buf_len - data_off;
 358                         (*rxq->iovecs)[mbuf->nb_segs].iov_base =
 359                                 (char *)buf->buf_addr + data_off;
 360
 361                         seg->data_len = RTE_MIN(seg->buf_len - data_off, len);
 362                         seg->data_off = data_off;
 363
 364                         len -= seg->data_len;
 365                         if (len <= 0)
 366                                 break;
 367                         mbuf->nb_segs++;
 368                         /* First segment has headroom, not the others */
 369                         data_off = 0;
 370                 }
 371                 seg->next = NULL;
 372                 mbuf->packet_type = rte_net_get_ptype(mbuf, NULL,
 373                                                       RTE_PTYPE_ALL_MASK);
 374
 375                 /* account for the receive frame */
 376                 bufs[num_rx++] = mbuf;
 377                 num_rx_bytes += mbuf->pkt_len;
 378         }
 379 end:
 380         rxq->stats.ipackets += num_rx;
 381         rxq->stats.ibytes += num_rx_bytes;
 382
 383         return num_rx;
 384 }
 385
 386 /* Callback to handle sending packets from the tap interface
 387  */
 388 static uint16_t
 389 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 390 {
 391         struct tx_queue *txq = queue;
 392         uint16_t num_tx = 0;
 393         unsigned long num_tx_bytes = 0;
 394         uint32_t max_size;
 395         int i;
 396
 397         if (unlikely(nb_pkts == 0))
 398                 return 0;
 399
 400         max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4);
 401         for (i = 0; i < nb_pkts; i++) {
 402                 struct rte_mbuf *mbuf = bufs[num_tx];
 403                 struct iovec iovecs[mbuf->nb_segs + 1];
 404                 struct tun_pi pi = { .flags = 0 };
 405                 struct rte_mbuf *seg = mbuf;
 406                 int n;
 407                 int j;
 408
 409                 /* stats.errs will be incremented */
 410                 if (rte_pktmbuf_pkt_len(mbuf) > max_size)
 411                         break;
 412
 413                 iovecs[0].iov_base = &pi;
 414                 iovecs[0].iov_len = sizeof(pi);
 415                 for (j = 1; j <= mbuf->nb_segs; j++) {
 416                         iovecs[j].iov_len = rte_pktmbuf_data_len(seg);
 417                         iovecs[j].iov_base =
 418                                 rte_pktmbuf_mtod(seg, void *);
 419                         seg = seg->next;
 420                 }
 421                 /* copy the tx frame data */
 422                 n = writev(txq->fd, iovecs, mbuf->nb_segs + 1);
 423                 if (n <= 0)
 424                         break;
 425
 426                 num_tx++;
 427                 num_tx_bytes += mbuf->pkt_len;
 428                 rte_pktmbuf_free(mbuf);
 429         }
 430
 431         txq->stats.opackets += num_tx;
 432         txq->stats.errs += nb_pkts - num_tx;
 433         txq->stats.obytes += num_tx_bytes;
 434
 435         return num_tx;
 436 }
 437
 438 static int
 439 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 440           struct ifreq *ifr, int set)
 441 {
 442         short req_flags = ifr->ifr_flags;
 443         int remote = !!pmd->remote_if_index;
 444
 445         /*
 446          * If there is a remote netdevice, apply ioctl on it, then apply it on
 447          * the tap netdevice.
 448          */
 449         if (request == SIOCGIFFLAGS && !set) {
 450                 /*
 451                  * Special case for getting flags. If set is given,
 452                  * then return the flags from the remote netdevice only.
 453                  * Otherwise return the flags from the tap netdevice.
 454                  */
 455                 remote = 0;
 456         }
 457 apply:
 458         if (remote)
 459                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->remote_iface);
 460         else
 461                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->name);
 462         switch (request) {
 463         case SIOCSIFFLAGS:
 464                 /* fetch current flags to leave other flags untouched */
 465                 if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
 466                         goto error;
 467                 if (set)
 468                         ifr->ifr_flags |= req_flags;
 469                 else
 470                         ifr->ifr_flags &= ~req_flags;
 471                 break;
 472         case SIOCGIFFLAGS:
 473                 if (remote && set)
 474                         remote = 0; /* don't loop */
 475                 break;
 476         case SIOCGIFHWADDR:
 477                 /* Set remote MAC on the tap netdevice */
 478                 if (!remote && pmd->remote_if_index) {
 479                         request = SIOCSIFHWADDR;
 480                         goto apply;
 481                 }
 482                 break;
 483         case SIOCSIFHWADDR:
 484         case SIOCSIFMTU:
 485                 break;
 486         default:
 487                 RTE_LOG(WARNING, PMD, "%s: ioctl() called with wrong arg\n",
 488                         pmd->name);
 489                 return -EINVAL;
 490         }
 491         if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
 492                 goto error;
 493         if (remote--)
 494                 goto apply;
 495         return 0;
 496
 497 error:
 498         RTE_LOG(ERR, PMD, "%s: ioctl(%lu) failed with error: %s\n",
 499                 ifr->ifr_name, request, strerror(errno));
 500         return -errno;
 501 }
 502
 503 static int
 504 tap_link_set_down(struct rte_eth_dev *dev)
 505 {
 506         struct pmd_internals *pmd = dev->data->dev_private;
 507         struct ifreq ifr = { .ifr_flags = IFF_UP };
 508
 509         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 510         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0);
 511 }
 512
 513 static int
 514 tap_link_set_up(struct rte_eth_dev *dev)
 515 {
 516         struct pmd_internals *pmd = dev->data->dev_private;
 517         struct ifreq ifr = { .ifr_flags = IFF_UP };
 518
 519         dev->data->dev_link.link_status = ETH_LINK_UP;
 520         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1);
 521 }
 522
 523 static int
 524 tap_dev_start(struct rte_eth_dev *dev)
 525 {
 526         int err;
 527
 528         err = tap_intr_handle_set(dev, 1);
 529         if (err)
 530                 return err;
 531         return tap_link_set_up(dev);
 532 }
 533
 534 /* This function gets called when the current port gets stopped.
 535  */
 536 static void
 537 tap_dev_stop(struct rte_eth_dev *dev)
 538 {
 539         tap_intr_handle_set(dev, 0);
 540         tap_link_set_down(dev);
 541 }
 542
 543 static int
 544 tap_dev_configure(struct rte_eth_dev *dev __rte_unused)
 545 {
 546         return 0;
 547 }
 548
 549 static uint32_t
 550 tap_dev_speed_capa(void)
 551 {
 552         uint32_t speed = pmd_link.link_speed;
 553         uint32_t capa = 0;
 554
 555         if (speed >= ETH_SPEED_NUM_10M)
 556                 capa |= ETH_LINK_SPEED_10M;
 557         if (speed >= ETH_SPEED_NUM_100M)
 558                 capa |= ETH_LINK_SPEED_100M;
 559         if (speed >= ETH_SPEED_NUM_1G)
 560                 capa |= ETH_LINK_SPEED_1G;
 561         if (speed >= ETH_SPEED_NUM_5G)
 562                 capa |= ETH_LINK_SPEED_2_5G;
 563         if (speed >= ETH_SPEED_NUM_5G)
 564                 capa |= ETH_LINK_SPEED_5G;
 565         if (speed >= ETH_SPEED_NUM_10G)
 566                 capa |= ETH_LINK_SPEED_10G;
 567         if (speed >= ETH_SPEED_NUM_20G)
 568                 capa |= ETH_LINK_SPEED_20G;
 569         if (speed >= ETH_SPEED_NUM_25G)
 570                 capa |= ETH_LINK_SPEED_25G;
 571         if (speed >= ETH_SPEED_NUM_40G)
 572                 capa |= ETH_LINK_SPEED_40G;
 573         if (speed >= ETH_SPEED_NUM_50G)
 574                 capa |= ETH_LINK_SPEED_50G;
 575         if (speed >= ETH_SPEED_NUM_56G)
 576                 capa |= ETH_LINK_SPEED_56G;
 577         if (speed >= ETH_SPEED_NUM_100G)
 578                 capa |= ETH_LINK_SPEED_100G;
 579
 580         return capa;
 581 }
 582
 583 static void
 584 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 585 {
 586         struct pmd_internals *internals = dev->data->dev_private;
 587
 588         dev_info->if_index = internals->if_index;
 589         dev_info->max_mac_addrs = 1;
 590         dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
 591         dev_info->max_rx_queues = internals->nb_queues;
 592         dev_info->max_tx_queues = internals->nb_queues;
 593         dev_info->min_rx_bufsize = 0;
 594         dev_info->pci_dev = NULL;
 595         dev_info->speed_capa = tap_dev_speed_capa();
 596 }
 597
 598 static void
 599 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
 600 {
 601         unsigned int i, imax;
 602         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 603         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 604         unsigned long rx_nombuf = 0, ierrors = 0;
 605         const struct pmd_internals *pmd = dev->data->dev_private;
 606
 607         imax = (pmd->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 608                 pmd->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 609
 610         for (i = 0; i < imax; i++) {
 611                 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
 612                 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
 613                 rx_total += tap_stats->q_ipackets[i];
 614                 rx_bytes_total += tap_stats->q_ibytes[i];
 615                 rx_nombuf += pmd->rxq[i].stats.rx_nombuf;
 616                 ierrors += pmd->rxq[i].stats.ierrors;
 617
 618                 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
 619                 tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
 620                 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
 621                 tx_total += tap_stats->q_opackets[i];
 622                 tx_err_total += tap_stats->q_errors[i];
 623                 tx_bytes_total += tap_stats->q_obytes[i];
 624         }
 625
 626         tap_stats->ipackets = rx_total;
 627         tap_stats->ibytes = rx_bytes_total;
 628         tap_stats->ierrors = ierrors;
 629         tap_stats->rx_nombuf = rx_nombuf;
 630         tap_stats->opackets = tx_total;
 631         tap_stats->oerrors = tx_err_total;
 632         tap_stats->obytes = tx_bytes_total;
 633 }
 634
 635 static void
 636 tap_stats_reset(struct rte_eth_dev *dev)
 637 {
 638         int i;
 639         struct pmd_internals *pmd = dev->data->dev_private;
 640
 641         for (i = 0; i < pmd->nb_queues; i++) {
 642                 pmd->rxq[i].stats.ipackets = 0;
 643                 pmd->rxq[i].stats.ibytes = 0;
 644                 pmd->rxq[i].stats.ierrors = 0;
 645                 pmd->rxq[i].stats.rx_nombuf = 0;
 646
 647                 pmd->txq[i].stats.opackets = 0;
 648                 pmd->txq[i].stats.errs = 0;
 649                 pmd->txq[i].stats.obytes = 0;
 650         }
 651 }
 652
 653 static void
 654 tap_dev_close(struct rte_eth_dev *dev __rte_unused)
 655 {
 656         int i;
 657         struct pmd_internals *internals = dev->data->dev_private;
 658
 659         tap_link_set_down(dev);
 660         tap_flow_flush(dev, NULL);
 661         tap_flow_implicit_flush(internals, NULL);
 662
 663         for (i = 0; i < internals->nb_queues; i++) {
 664                 if (internals->rxq[i].fd != -1)
 665                         close(internals->rxq[i].fd);
 666                 internals->rxq[i].fd = -1;
 667                 internals->txq[i].fd = -1;
 668         }
 669 }
 670
 671 static void
 672 tap_rx_queue_release(void *queue)
 673 {
 674         struct rx_queue *rxq = queue;
 675
 676         if (rxq && (rxq->fd > 0)) {
 677                 close(rxq->fd);
 678                 rxq->fd = -1;
 679                 rte_pktmbuf_free(rxq->pool);
 680                 rte_free(rxq->iovecs);
 681                 rxq->pool = NULL;
 682                 rxq->iovecs = NULL;
 683         }
 684 }
 685
 686 static void
 687 tap_tx_queue_release(void *queue)
 688 {
 689         struct tx_queue *txq = queue;
 690
 691         if (txq && (txq->fd > 0)) {
 692                 close(txq->fd);
 693                 txq->fd = -1;
 694         }
 695 }
 696
 697 static int
 698 tap_link_update(struct rte_eth_dev *dev, int wait_to_complete __rte_unused)
 699 {
 700         struct rte_eth_link *dev_link = &dev->data->dev_link;
 701         struct pmd_internals *pmd = dev->data->dev_private;
 702         struct ifreq ifr = { .ifr_flags = 0 };
 703
 704         if (pmd->remote_if_index) {
 705                 tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 1);
 706                 if (!(ifr.ifr_flags & IFF_UP) ||
 707                     !(ifr.ifr_flags & IFF_RUNNING)) {
 708                         dev_link->link_status = ETH_LINK_DOWN;
 709                         return 0;
 710                 }
 711         }
 712         tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0);
 713         dev_link->link_status =
 714                 ((ifr.ifr_flags & IFF_UP) && (ifr.ifr_flags & IFF_RUNNING) ?
 715                  ETH_LINK_UP :
 716                  ETH_LINK_DOWN);
 717         return 0;
 718 }
 719
 720 static void
 721 tap_promisc_enable(struct rte_eth_dev *dev)
 722 {
 723         struct pmd_internals *pmd = dev->data->dev_private;
 724         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 725
 726         dev->data->promiscuous = 1;
 727         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1);
 728         if (pmd->remote_if_index)
 729                 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC);
 730 }
 731
 732 static void
 733 tap_promisc_disable(struct rte_eth_dev *dev)
 734 {
 735         struct pmd_internals *pmd = dev->data->dev_private;
 736         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 737
 738         dev->data->promiscuous = 0;
 739         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0);
 740         if (pmd->remote_if_index)
 741                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC);
 742 }
 743
 744 static void
 745 tap_allmulti_enable(struct rte_eth_dev *dev)
 746 {
 747         struct pmd_internals *pmd = dev->data->dev_private;
 748         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 749
 750         dev->data->all_multicast = 1;
 751         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1);
 752         if (pmd->remote_if_index)
 753                 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI);
 754 }
 755
 756 static void
 757 tap_allmulti_disable(struct rte_eth_dev *dev)
 758 {
 759         struct pmd_internals *pmd = dev->data->dev_private;
 760         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 761
 762         dev->data->all_multicast = 0;
 763         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0);
 764         if (pmd->remote_if_index)
 765                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI);
 766 }
 767
 768
 769 static void
 770 tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
 771 {
 772         struct pmd_internals *pmd = dev->data->dev_private;
 773         struct ifreq ifr;
 774
 775         if (is_zero_ether_addr(mac_addr)) {
 776                 RTE_LOG(ERR, PMD, "%s: can't set an empty MAC address\n",
 777                         dev->data->name);
 778                 return;
 779         }
 780
 781         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
 782         rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETHER_ADDR_LEN);
 783         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1) < 0)
 784                 return;
 785         rte_memcpy(&pmd->eth_addr, mac_addr, ETHER_ADDR_LEN);
 786 }
 787
 788 static int
 789 tap_setup_queue(struct rte_eth_dev *dev,
 790                 struct pmd_internals *internals,
 791                 uint16_t qid)
 792 {
 793         struct pmd_internals *pmd = dev->data->dev_private;
 794         struct rx_queue *rx = &internals->rxq[qid];
 795         struct tx_queue *tx = &internals->txq[qid];
 796         int fd;
 797
 798         fd = rx->fd;
 799         if (fd < 0) {
 800                 fd = tx->fd;
 801                 if (fd < 0) {
 802                         RTE_LOG(INFO, PMD, "Add queue to TAP %s for qid %d\n",
 803                                 pmd->name, qid);
 804                         fd = tun_alloc(pmd, qid);
 805                         if (fd < 0) {
 806                                 RTE_LOG(ERR, PMD, "tun_alloc(%s, %d) failed\n",
 807                                         pmd->name, qid);
 808                                 return -1;
 809                         }
 810                         if (qid == 0) {
 811                                 struct ifreq ifr;
 812
 813                                 ifr.ifr_mtu = dev->data->mtu;
 814                                 if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1) < 0) {
 815                                         close(fd);
 816                                         return -1;
 817                                 }
 818                         }
 819                 }
 820         }
 821
 822         rx->fd = fd;
 823         tx->fd = fd;
 824         tx->mtu = &dev->data->mtu;
 825         rx->rxmode = &dev->data->dev_conf.rxmode;
 826
 827         return fd;
 828 }
 829
 830 static int
 831 rx_setup_queue(struct rte_eth_dev *dev,
 832                 struct pmd_internals *internals,
 833                 uint16_t qid)
 834 {
 835         dev->data->rx_queues[qid] = &internals->rxq[qid];
 836
 837         return tap_setup_queue(dev, internals, qid);
 838 }
 839
 840 static int
 841 tx_setup_queue(struct rte_eth_dev *dev,
 842                 struct pmd_internals *internals,
 843                 uint16_t qid)
 844 {
 845         dev->data->tx_queues[qid] = &internals->txq[qid];
 846
 847         return tap_setup_queue(dev, internals, qid);
 848 }
 849
 850 static int
 851 tap_rx_queue_setup(struct rte_eth_dev *dev,
 852                    uint16_t rx_queue_id,
 853                    uint16_t nb_rx_desc,
 854                    unsigned int socket_id,
 855                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 856                    struct rte_mempool *mp)
 857 {
 858         struct pmd_internals *internals = dev->data->dev_private;
 859         struct rx_queue *rxq = &internals->rxq[rx_queue_id];
 860         struct rte_mbuf **tmp = &rxq->pool;
 861         struct iovec (*iovecs)[nb_rx_desc + 1];
 862         int data_off = RTE_PKTMBUF_HEADROOM;
 863         int ret = 0;
 864         int fd;
 865         int i;
 866
 867         if ((rx_queue_id >= internals->nb_queues) || !mp) {
 868                 RTE_LOG(WARNING, PMD,
 869                         "nb_queues %d too small or mempool NULL\n",
 870                         internals->nb_queues);
 871                 return -1;
 872         }
 873
 874         rxq->mp = mp;
 875         rxq->trigger_seen = 1; /* force initial burst */
 876         rxq->in_port = dev->data->port_id;
 877         rxq->nb_rx_desc = nb_rx_desc;
 878         iovecs = rte_zmalloc_socket(dev->data->name, sizeof(*iovecs), 0,
 879                                     socket_id);
 880         if (!iovecs) {
 881                 RTE_LOG(WARNING, PMD,
 882                         "%s: Couldn't allocate %d RX descriptors\n",
 883                         dev->data->name, nb_rx_desc);
 884                 return -ENOMEM;
 885         }
 886         rxq->iovecs = iovecs;
 887
 888         fd = rx_setup_queue(dev, internals, rx_queue_id);
 889         if (fd == -1) {
 890                 ret = fd;
 891                 goto error;
 892         }
 893
 894         (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
 895         (*rxq->iovecs)[0].iov_base = &rxq->pi;
 896
 897         for (i = 1; i <= nb_rx_desc; i++) {
 898                 *tmp = rte_pktmbuf_alloc(rxq->mp);
 899                 if (!*tmp) {
 900                         RTE_LOG(WARNING, PMD,
 901                                 "%s: couldn't allocate memory for queue %d\n",
 902                                 dev->data->name, rx_queue_id);
 903                         ret = -ENOMEM;
 904                         goto error;
 905                 }
 906                 (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off;
 907                 (*rxq->iovecs)[i].iov_base =
 908                         (char *)(*tmp)->buf_addr + data_off;
 909                 data_off = 0;
 910                 tmp = &(*tmp)->next;
 911         }
 912
 913         RTE_LOG(DEBUG, PMD, "  RX TAP device name %s, qid %d on fd %d\n",
 914                 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
 915
 916         return 0;
 917
 918 error:
 919         rte_pktmbuf_free(rxq->pool);
 920         rxq->pool = NULL;
 921         rte_free(rxq->iovecs);
 922         rxq->iovecs = NULL;
 923         return ret;
 924 }
 925
 926 static int
 927 tap_tx_queue_setup(struct rte_eth_dev *dev,
 928                    uint16_t tx_queue_id,
 929                    uint16_t nb_tx_desc __rte_unused,
 930                    unsigned int socket_id __rte_unused,
 931                    const struct rte_eth_txconf *tx_conf __rte_unused)
 932 {
 933         struct pmd_internals *internals = dev->data->dev_private;
 934         int ret;
 935
 936         if (tx_queue_id >= internals->nb_queues)
 937                 return -1;
 938
 939         ret = tx_setup_queue(dev, internals, tx_queue_id);
 940         if (ret == -1)
 941                 return -1;
 942
 943         RTE_LOG(DEBUG, PMD, "  TX TAP device name %s, qid %d on fd %d\n",
 944                 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
 945
 946         return 0;
 947 }
 948
 949 static int
 950 tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 951 {
 952         struct pmd_internals *pmd = dev->data->dev_private;
 953         struct ifreq ifr = { .ifr_mtu = mtu };
 954         int err = 0;
 955
 956         err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1);
 957         if (!err)
 958                 dev->data->mtu = mtu;
 959
 960         return err;
 961 }
 962
 963 static int
 964 tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
 965                      struct ether_addr *mc_addr_set __rte_unused,
 966                      uint32_t nb_mc_addr __rte_unused)
 967 {
 968         /*
 969          * Nothing to do actually: the tap has no filtering whatsoever, every
 970          * packet is received.
 971          */
 972         return 0;
 973 }
 974
 975 static int
 976 tap_nl_msg_handler(struct nlmsghdr *nh, void *arg)
 977 {
 978         struct rte_eth_dev *dev = arg;
 979         struct pmd_internals *pmd = dev->data->dev_private;
 980         struct ifinfomsg *info = NLMSG_DATA(nh);
 981
 982         if (nh->nlmsg_type != RTM_NEWLINK ||
 983             (info->ifi_index != pmd->if_index &&
 984              info->ifi_index != pmd->remote_if_index))
 985                 return 0;
 986         return tap_link_update(dev, 0);
 987 }
 988
 989 static void
 990 tap_dev_intr_handler(struct rte_intr_handle *intr_handle __rte_unused,
 991                      void *cb_arg)
 992 {
 993         struct rte_eth_dev *dev = cb_arg;
 994         struct pmd_internals *pmd = dev->data->dev_private;
 995
 996         nl_recv(pmd->intr_handle.fd, tap_nl_msg_handler, dev);
 997 }
 998
 999 static int
1000 tap_intr_handle_set(struct rte_eth_dev *dev, int set)
1001 {
1002         struct pmd_internals *pmd = dev->data->dev_private;
1003
1004         /* In any case, disable interrupt if the conf is no longer there. */
1005         if (!dev->data->dev_conf.intr_conf.lsc) {
1006                 if (pmd->intr_handle.fd != -1)
1007                         nl_final(pmd->intr_handle.fd);
1008                 rte_intr_callback_unregister(
1009                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1010                 return 0;
1011         }
1012         if (set) {
1013                 pmd->intr_handle.fd = nl_init(RTMGRP_LINK);
1014                 if (unlikely(pmd->intr_handle.fd == -1))
1015                         return -EBADF;
1016                 return rte_intr_callback_register(
1017                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1018         }
1019         nl_final(pmd->intr_handle.fd);
1020         return rte_intr_callback_unregister(&pmd->intr_handle,
1021                                             tap_dev_intr_handler, dev);
1022 }
1023
1024 static const uint32_t*
1025 tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused)
1026 {
1027         static const uint32_t ptypes[] = {
1028                 RTE_PTYPE_INNER_L2_ETHER,
1029                 RTE_PTYPE_INNER_L2_ETHER_VLAN,
1030                 RTE_PTYPE_INNER_L2_ETHER_QINQ,
1031                 RTE_PTYPE_INNER_L3_IPV4,
1032                 RTE_PTYPE_INNER_L3_IPV4_EXT,
1033                 RTE_PTYPE_INNER_L3_IPV6,
1034                 RTE_PTYPE_INNER_L3_IPV6_EXT,
1035                 RTE_PTYPE_INNER_L4_FRAG,
1036                 RTE_PTYPE_INNER_L4_UDP,
1037                 RTE_PTYPE_INNER_L4_TCP,
1038                 RTE_PTYPE_INNER_L4_SCTP,
1039                 RTE_PTYPE_L2_ETHER,
1040                 RTE_PTYPE_L2_ETHER_VLAN,
1041                 RTE_PTYPE_L2_ETHER_QINQ,
1042                 RTE_PTYPE_L3_IPV4,
1043                 RTE_PTYPE_L3_IPV4_EXT,
1044                 RTE_PTYPE_L3_IPV6_EXT,
1045                 RTE_PTYPE_L3_IPV6,
1046                 RTE_PTYPE_L4_FRAG,
1047                 RTE_PTYPE_L4_UDP,
1048                 RTE_PTYPE_L4_TCP,
1049                 RTE_PTYPE_L4_SCTP,
1050         };
1051
1052         return ptypes;
1053 }
1054
1055 static int
1056 tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused,
1057                   struct rte_eth_fc_conf *fc_conf)
1058 {
1059         fc_conf->mode = RTE_FC_NONE;
1060         return 0;
1061 }
1062
1063 static int
1064 tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused,
1065                   struct rte_eth_fc_conf *fc_conf)
1066 {
1067         if (fc_conf->mode != RTE_FC_NONE)
1068                 return -ENOTSUP;
1069         return 0;
1070 }
1071
1072 static const struct eth_dev_ops ops = {
1073         .dev_start              = tap_dev_start,
1074         .dev_stop               = tap_dev_stop,
1075         .dev_close              = tap_dev_close,
1076         .dev_configure          = tap_dev_configure,
1077         .dev_infos_get          = tap_dev_info,
1078         .rx_queue_setup         = tap_rx_queue_setup,
1079         .tx_queue_setup         = tap_tx_queue_setup,
1080         .rx_queue_release       = tap_rx_queue_release,
1081         .tx_queue_release       = tap_tx_queue_release,
1082         .flow_ctrl_get          = tap_flow_ctrl_get,
1083         .flow_ctrl_set          = tap_flow_ctrl_set,
1084         .link_update            = tap_link_update,
1085         .dev_set_link_up        = tap_link_set_up,
1086         .dev_set_link_down      = tap_link_set_down,
1087         .promiscuous_enable     = tap_promisc_enable,
1088         .promiscuous_disable    = tap_promisc_disable,
1089         .allmulticast_enable    = tap_allmulti_enable,
1090         .allmulticast_disable   = tap_allmulti_disable,
1091         .mac_addr_set           = tap_mac_set,
1092         .mtu_set                = tap_mtu_set,
1093         .set_mc_addr_list       = tap_set_mc_addr_list,
1094         .stats_get              = tap_stats_get,
1095         .stats_reset            = tap_stats_reset,
1096         .dev_supported_ptypes_get = tap_dev_supported_ptypes_get,
1097         .filter_ctrl            = tap_dev_filter_ctrl,
1098 };
1099
1100 static int
1101 tap_kernel_support(struct pmd_internals *pmd)
1102 {
1103         struct utsname utsname;
1104         int ver[3];
1105
1106         if (uname(&utsname) == -1 ||
1107             sscanf(utsname.release, "%d.%d.%d",
1108                    &ver[0], &ver[1], &ver[2]) != 3)
1109                 return 0;
1110         if (KERNEL_VERSION(ver[0], ver[1], ver[2]) >= FLOWER_KERNEL_VERSION)
1111                 pmd->flower_support = 1;
1112         if (KERNEL_VERSION(ver[0], ver[1], ver[2]) >=
1113             FLOWER_VLAN_KERNEL_VERSION)
1114                 pmd->flower_vlan_support = 1;
1115         return 1;
1116 }
1117
1118 static int
1119 eth_dev_tap_create(const char *name, char *tap_name, char *remote_iface)
1120 {
1121         int numa_node = rte_socket_id();
1122         struct rte_eth_dev *dev = NULL;
1123         struct pmd_internals *pmd = NULL;
1124         struct rte_eth_dev_data *data = NULL;
1125         int i;
1126
1127         RTE_LOG(DEBUG, PMD, "  TAP device on numa %u\n", rte_socket_id());
1128
1129         data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node);
1130         if (!data) {
1131                 RTE_LOG(ERR, PMD, "TAP Failed to allocate data\n");
1132                 goto error_exit;
1133         }
1134
1135         pmd = rte_zmalloc_socket(tap_name, sizeof(*pmd), 0, numa_node);
1136         if (!pmd) {
1137                 RTE_LOG(ERR, PMD, "TAP Unable to allocate internal struct\n");
1138                 goto error_exit;
1139         }
1140
1141         /* name in allocation and data->name must be consistent */
1142         snprintf(data->name, sizeof(data->name), "%s", name);
1143         dev = rte_eth_dev_allocate(name);
1144         if (!dev) {
1145                 RTE_LOG(ERR, PMD, "TAP Unable to allocate device struct\n");
1146                 goto error_exit;
1147         }
1148
1149         snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
1150
1151         pmd->nb_queues = RTE_PMD_TAP_MAX_QUEUES;
1152
1153         pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
1154         if (pmd->ioctl_sock == -1) {
1155                 RTE_LOG(ERR, PMD,
1156                         "TAP Unable to get a socket for management: %s\n",
1157                         strerror(errno));
1158                 goto error_exit;
1159         }
1160
1161         /* Setup some default values */
1162         data->dev_private = pmd;
1163         data->port_id = dev->data->port_id;
1164         data->mtu = dev->data->mtu;
1165         data->dev_flags = RTE_ETH_DEV_DETACHABLE | RTE_ETH_DEV_INTR_LSC;
1166         data->kdrv = RTE_KDRV_NONE;
1167         data->drv_name = pmd_tap_drv.driver.name;
1168         data->numa_node = numa_node;
1169
1170         data->dev_link = pmd_link;
1171         data->mac_addrs = &pmd->eth_addr;
1172         data->nb_rx_queues = pmd->nb_queues;
1173         data->nb_tx_queues = pmd->nb_queues;
1174
1175         dev->data = data;
1176         dev->dev_ops = &ops;
1177         dev->driver = NULL;
1178         dev->rx_pkt_burst = pmd_rx_burst;
1179         dev->tx_pkt_burst = pmd_tx_burst;
1180
1181         pmd->intr_handle.type = RTE_INTR_HANDLE_EXT;
1182         pmd->intr_handle.fd = -1;
1183
1184         /* Presetup the fds to -1 as being not valid */
1185         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1186                 pmd->rxq[i].fd = -1;
1187                 pmd->txq[i].fd = -1;
1188         }
1189
1190         tap_kernel_support(pmd);
1191         if (!pmd->flower_support)
1192                 return 0;
1193         LIST_INIT(&pmd->flows);
1194         /*
1195          * If no netlink socket can be created, then it will fail when
1196          * creating/destroying flow rules.
1197          */
1198         pmd->nlsk_fd = nl_init(0);
1199         if (strlen(remote_iface)) {
1200                 pmd->remote_if_index = if_nametoindex(remote_iface);
1201                 snprintf(pmd->remote_iface, RTE_ETH_NAME_MAX_LEN,
1202                          "%s", remote_iface);
1203                 if (!pmd->remote_if_index)
1204                         RTE_LOG(ERR, PMD, "Could not find %s ifindex: "
1205                                 "remote interface will remain unconfigured\n",
1206                                 remote_iface);
1207         }
1208
1209         return 0;
1210
1211 error_exit:
1212         RTE_LOG(DEBUG, PMD, "TAP Unable to initialize %s\n", name);
1213
1214         rte_free(data);
1215         rte_free(pmd);
1216
1217         rte_eth_dev_release_port(dev);
1218
1219         return -EINVAL;
1220 }
1221
1222 static int
1223 set_interface_name(const char *key __rte_unused,
1224                    const char *value,
1225                    void *extra_args)
1226 {
1227         char *name = (char *)extra_args;
1228
1229         if (value)
1230                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
1231         else
1232                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
1233                          DEFAULT_TAP_NAME, (tap_unit - 1));
1234
1235         return 0;
1236 }
1237
1238 static int
1239 set_interface_speed(const char *key __rte_unused,
1240                     const char *value,
1241                     void *extra_args)
1242 {
1243         *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G;
1244
1245         return 0;
1246 }
1247
1248 static int
1249 set_remote_iface(const char *key __rte_unused,
1250                  const char *value,
1251                  void *extra_args)
1252 {
1253         char *name = (char *)extra_args;
1254
1255         if (value)
1256                 snprintf(name, RTE_ETH_NAME_MAX_LEN, "%s", value);
1257
1258         return 0;
1259 }
1260
1261 /* Open a TAP interface device.
1262  */
1263 static int
1264 rte_pmd_tap_probe(const char *name, const char *params)
1265 {
1266         int ret;
1267         struct rte_kvargs *kvlist = NULL;
1268         int speed;
1269         char tap_name[RTE_ETH_NAME_MAX_LEN];
1270         char remote_iface[RTE_ETH_NAME_MAX_LEN];
1271
1272         speed = ETH_SPEED_NUM_10G;
1273         snprintf(tap_name, sizeof(tap_name), "%s%d",
1274                  DEFAULT_TAP_NAME, tap_unit++);
1275         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
1276
1277         if (params && (params[0] != '\0')) {
1278                 RTE_LOG(DEBUG, PMD, "paramaters (%s)\n", params);
1279
1280                 kvlist = rte_kvargs_parse(params, valid_arguments);
1281                 if (kvlist) {
1282                         if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) {
1283                                 ret = rte_kvargs_process(kvlist,
1284                                                          ETH_TAP_SPEED_ARG,
1285                                                          &set_interface_speed,
1286                                                          &speed);
1287                                 if (ret == -1)
1288                                         goto leave;
1289                         }
1290
1291                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
1292                                 ret = rte_kvargs_process(kvlist,
1293                                                          ETH_TAP_IFACE_ARG,
1294                                                          &set_interface_name,
1295                                                          tap_name);
1296                                 if (ret == -1)
1297                                         goto leave;
1298                         }
1299
1300                         if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) {
1301                                 ret = rte_kvargs_process(kvlist,
1302                                                          ETH_TAP_REMOTE_ARG,
1303                                                          &set_remote_iface,
1304                                                          remote_iface);
1305                                 if (ret == -1)
1306                                         goto leave;
1307                         }
1308                 }
1309         }
1310         pmd_link.link_speed = speed;
1311
1312         RTE_LOG(NOTICE, PMD, "Initializing pmd_tap for %s as %s\n",
1313                 name, tap_name);
1314
1315         ret = eth_dev_tap_create(name, tap_name, remote_iface);
1316
1317 leave:
1318         if (ret == -1) {
1319                 RTE_LOG(ERR, PMD, "Failed to create pmd for %s as %s\n",
1320                         name, tap_name);
1321                 tap_unit--;             /* Restore the unit number */
1322         }
1323         rte_kvargs_free(kvlist);
1324
1325         return ret;
1326 }
1327
1328 /* detach a TAP device.
1329  */
1330 static int
1331 rte_pmd_tap_remove(const char *name)
1332 {
1333         struct rte_eth_dev *eth_dev = NULL;
1334         struct pmd_internals *internals;
1335         int i;
1336
1337         RTE_LOG(DEBUG, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
1338                 rte_socket_id());
1339
1340         /* find the ethdev entry */
1341         eth_dev = rte_eth_dev_allocated(name);
1342         if (!eth_dev)
1343                 return 0;
1344
1345         internals = eth_dev->data->dev_private;
1346         if (internals->flower_support && internals->nlsk_fd) {
1347                 tap_flow_flush(eth_dev, NULL);
1348                 tap_flow_implicit_flush(internals, NULL);
1349                 nl_final(internals->nlsk_fd);
1350         }
1351         for (i = 0; i < internals->nb_queues; i++)
1352                 if (internals->rxq[i].fd != -1)
1353                         close(internals->rxq[i].fd);
1354
1355         close(internals->ioctl_sock);
1356         rte_free(eth_dev->data->dev_private);
1357         rte_free(eth_dev->data);
1358
1359         rte_eth_dev_release_port(eth_dev);
1360
1361         return 0;
1362 }
1363
1364 static struct rte_vdev_driver pmd_tap_drv = {
1365         .probe = rte_pmd_tap_probe,
1366         .remove = rte_pmd_tap_remove,
1367 };
1368 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
1369 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
1370 RTE_PMD_REGISTER_PARAM_STRING(net_tap, "iface=<string>,speed=N");