drivers/net/tap/rte_eth_tap.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2016-2017 Intel Corporation
   3  */
   4
   5 #include <rte_atomic.h>
   6 #include <rte_branch_prediction.h>
   7 #include <rte_byteorder.h>
   8 #include <rte_common.h>
   9 #include <rte_mbuf.h>
  10 #include <rte_ethdev_driver.h>
  11 #include <rte_ethdev_vdev.h>
  12 #include <rte_malloc.h>
  13 #include <rte_bus_vdev.h>
  14 #include <rte_kvargs.h>
  15 #include <rte_net.h>
  16 #include <rte_debug.h>
  17 #include <rte_ip.h>
  18
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21 #include <sys/socket.h>
  22 #include <sys/ioctl.h>
  23 #include <sys/utsname.h>
  24 #include <sys/mman.h>
  25 #include <errno.h>
  26 #include <signal.h>
  27 #include <stdbool.h>
  28 #include <stdint.h>
  29 #include <sys/uio.h>
  30 #include <unistd.h>
  31 #include <arpa/inet.h>
  32 #include <net/if.h>
  33 #include <linux/if_tun.h>
  34 #include <linux/if_ether.h>
  35 #include <fcntl.h>
  36
  37 #include <rte_eth_tap.h>
  38 #include <tap_flow.h>
  39 #include <tap_netlink.h>
  40 #include <tap_tcmsgs.h>
  41
  42 /* Linux based path to the TUN device */
  43 #define TUN_TAP_DEV_PATH        "/dev/net/tun"
  44 #define DEFAULT_TAP_NAME        "dtap"
  45
  46 #define ETH_TAP_IFACE_ARG       "iface"
  47 #define ETH_TAP_REMOTE_ARG      "remote"
  48 #define ETH_TAP_MAC_ARG         "mac"
  49 #define ETH_TAP_MAC_FIXED       "fixed"
  50
  51 static struct rte_vdev_driver pmd_tap_drv;
  52
  53 static const char *valid_arguments[] = {
  54         ETH_TAP_IFACE_ARG,
  55         ETH_TAP_REMOTE_ARG,
  56         ETH_TAP_MAC_ARG,
  57         NULL
  58 };
  59
  60 static int tap_unit;
  61
  62 static volatile uint32_t tap_trigger;   /* Rx trigger */
  63
  64 static struct rte_eth_link pmd_link = {
  65         .link_speed = ETH_SPEED_NUM_10G,
  66         .link_duplex = ETH_LINK_FULL_DUPLEX,
  67         .link_status = ETH_LINK_DOWN,
  68         .link_autoneg = ETH_LINK_AUTONEG
  69 };
  70
  71 static void
  72 tap_trigger_cb(int sig __rte_unused)
  73 {
  74         /* Valid trigger values are nonzero */
  75         tap_trigger = (tap_trigger + 1) | 0x80000000;
  76 }
  77
  78 /* Specifies on what netdevices the ioctl should be applied */
  79 enum ioctl_mode {
  80         LOCAL_AND_REMOTE,
  81         LOCAL_ONLY,
  82         REMOTE_ONLY,
  83 };
  84
  85 static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
  86
  87 /* Tun/Tap allocation routine
  88  *
  89  * name is the number of the interface to use, unless NULL to take the host
  90  * supplied name.
  91  */
  92 static int
  93 tun_alloc(struct pmd_internals *pmd)
  94 {
  95         struct ifreq ifr;
  96 #ifdef IFF_MULTI_QUEUE
  97         unsigned int features;
  98 #endif
  99         int fd;
 100
 101         memset(&ifr, 0, sizeof(struct ifreq));
 102
 103         /*
 104          * Do not set IFF_NO_PI as packet information header will be needed
 105          * to check if a received packet has been truncated.
 106          */
 107         ifr.ifr_flags = IFF_TAP;
 108         snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
 109
 110         RTE_LOG(DEBUG, PMD, "ifr_name '%s'\n", ifr.ifr_name);
 111
 112         fd = open(TUN_TAP_DEV_PATH, O_RDWR);
 113         if (fd < 0) {
 114                 RTE_LOG(ERR, PMD, "Unable to create TAP interface\n");
 115                 goto error;
 116         }
 117
 118 #ifdef IFF_MULTI_QUEUE
 119         /* Grab the TUN features to verify we can work multi-queue */
 120         if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
 121                 RTE_LOG(ERR, PMD, "TAP unable to get TUN/TAP features\n");
 122                 goto error;
 123         }
 124         RTE_LOG(DEBUG, PMD, "  TAP Features %08x\n", features);
 125
 126         if (features & IFF_MULTI_QUEUE) {
 127                 RTE_LOG(DEBUG, PMD, "  Multi-queue support for %d queues\n",
 128                         RTE_PMD_TAP_MAX_QUEUES);
 129                 ifr.ifr_flags |= IFF_MULTI_QUEUE;
 130         } else
 131 #endif
 132         {
 133                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 134                 RTE_LOG(DEBUG, PMD, "  Single queue only support\n");
 135         }
 136
 137         /* Set the TUN/TAP configuration and set the name if needed */
 138         if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
 139                 RTE_LOG(WARNING, PMD,
 140                         "Unable to set TUNSETIFF for %s\n",
 141                         ifr.ifr_name);
 142                 perror("TUNSETIFF");
 143                 goto error;
 144         }
 145
 146         /* Always set the file descriptor to non-blocking */
 147         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
 148                 RTE_LOG(WARNING, PMD,
 149                         "Unable to set %s to nonblocking\n",
 150                         ifr.ifr_name);
 151                 perror("F_SETFL, NONBLOCK");
 152                 goto error;
 153         }
 154
 155         /* Set up trigger to optimize empty Rx bursts */
 156         errno = 0;
 157         do {
 158                 struct sigaction sa;
 159                 int flags = fcntl(fd, F_GETFL);
 160
 161                 if (flags == -1 || sigaction(SIGIO, NULL, &sa) == -1)
 162                         break;
 163                 if (sa.sa_handler != tap_trigger_cb) {
 164                         /*
 165                          * Make sure SIGIO is not already taken. This is done
 166                          * as late as possible to leave the application a
 167                          * chance to set up its own signal handler first.
 168                          */
 169                         if (sa.sa_handler != SIG_IGN &&
 170                             sa.sa_handler != SIG_DFL) {
 171                                 errno = EBUSY;
 172                                 break;
 173                         }
 174                         sa = (struct sigaction){
 175                                 .sa_flags = SA_RESTART,
 176                                 .sa_handler = tap_trigger_cb,
 177                         };
 178                         if (sigaction(SIGIO, &sa, NULL) == -1)
 179                                 break;
 180                 }
 181                 /* Enable SIGIO on file descriptor */
 182                 fcntl(fd, F_SETFL, flags | O_ASYNC);
 183                 fcntl(fd, F_SETOWN, getpid());
 184         } while (0);
 185         if (errno) {
 186                 /* Disable trigger globally in case of error */
 187                 tap_trigger = 0;
 188                 RTE_LOG(WARNING, PMD, "Rx trigger disabled: %s\n",
 189                         strerror(errno));
 190         }
 191
 192         return fd;
 193
 194 error:
 195         if (fd > 0)
 196                 close(fd);
 197         return -1;
 198 }
 199
 200 static void
 201 tap_verify_csum(struct rte_mbuf *mbuf)
 202 {
 203         uint32_t l2 = mbuf->packet_type & RTE_PTYPE_L2_MASK;
 204         uint32_t l3 = mbuf->packet_type & RTE_PTYPE_L3_MASK;
 205         uint32_t l4 = mbuf->packet_type & RTE_PTYPE_L4_MASK;
 206         unsigned int l2_len = sizeof(struct ether_hdr);
 207         unsigned int l3_len;
 208         uint16_t cksum = 0;
 209         void *l3_hdr;
 210         void *l4_hdr;
 211
 212         if (l2 == RTE_PTYPE_L2_ETHER_VLAN)
 213                 l2_len += 4;
 214         else if (l2 == RTE_PTYPE_L2_ETHER_QINQ)
 215                 l2_len += 8;
 216         /* Don't verify checksum for packets with discontinuous L2 header */
 217         if (unlikely(l2_len + sizeof(struct ipv4_hdr) >
 218                      rte_pktmbuf_data_len(mbuf)))
 219                 return;
 220         l3_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len);
 221         if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
 222                 struct ipv4_hdr *iph = l3_hdr;
 223
 224                 /* ihl contains the number of 4-byte words in the header */
 225                 l3_len = 4 * (iph->version_ihl & 0xf);
 226                 if (unlikely(l2_len + l3_len > rte_pktmbuf_data_len(mbuf)))
 227                         return;
 228
 229                 cksum = ~rte_raw_cksum(iph, l3_len);
 230                 mbuf->ol_flags |= cksum ?
 231                         PKT_RX_IP_CKSUM_BAD :
 232                         PKT_RX_IP_CKSUM_GOOD;
 233         } else if (l3 == RTE_PTYPE_L3_IPV6) {
 234                 l3_len = sizeof(struct ipv6_hdr);
 235         } else {
 236                 /* IPv6 extensions are not supported */
 237                 return;
 238         }
 239         if (l4 == RTE_PTYPE_L4_UDP || l4 == RTE_PTYPE_L4_TCP) {
 240                 l4_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len + l3_len);
 241                 /* Don't verify checksum for multi-segment packets. */
 242                 if (mbuf->nb_segs > 1)
 243                         return;
 244                 if (l3 == RTE_PTYPE_L3_IPV4)
 245                         cksum = ~rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
 246                 else if (l3 == RTE_PTYPE_L3_IPV6)
 247                         cksum = ~rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
 248                 mbuf->ol_flags |= cksum ?
 249                         PKT_RX_L4_CKSUM_BAD :
 250                         PKT_RX_L4_CKSUM_GOOD;
 251         }
 252 }
 253
 254 static uint64_t
 255 tap_rx_offload_get_port_capa(void)
 256 {
 257         /*
 258          * In order to support legacy apps,
 259          * report capabilities also as port capabilities.
 260          */
 261         return DEV_RX_OFFLOAD_SCATTER |
 262                DEV_RX_OFFLOAD_IPV4_CKSUM |
 263                DEV_RX_OFFLOAD_UDP_CKSUM |
 264                DEV_RX_OFFLOAD_TCP_CKSUM |
 265                DEV_RX_OFFLOAD_CRC_STRIP;
 266 }
 267
 268 static uint64_t
 269 tap_rx_offload_get_queue_capa(void)
 270 {
 271         return DEV_RX_OFFLOAD_SCATTER |
 272                DEV_RX_OFFLOAD_IPV4_CKSUM |
 273                DEV_RX_OFFLOAD_UDP_CKSUM |
 274                DEV_RX_OFFLOAD_TCP_CKSUM |
 275                DEV_RX_OFFLOAD_CRC_STRIP;
 276 }
 277
 278 static bool
 279 tap_rxq_are_offloads_valid(struct rte_eth_dev *dev, uint64_t offloads)
 280 {
 281         uint64_t port_offloads = dev->data->dev_conf.rxmode.offloads;
 282         uint64_t queue_supp_offloads = tap_rx_offload_get_queue_capa();
 283         uint64_t port_supp_offloads = tap_rx_offload_get_port_capa();
 284
 285         if ((offloads & (queue_supp_offloads | port_supp_offloads)) !=
 286             offloads)
 287                 return false;
 288         if ((port_offloads ^ offloads) & port_supp_offloads)
 289                 return false;
 290         return true;
 291 }
 292
 293 /* Callback to handle the rx burst of packets to the correct interface and
 294  * file descriptor(s) in a multi-queue setup.
 295  */
 296 static uint16_t
 297 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 298 {
 299         struct rx_queue *rxq = queue;
 300         uint16_t num_rx;
 301         unsigned long num_rx_bytes = 0;
 302         uint32_t trigger = tap_trigger;
 303
 304         if (trigger == rxq->trigger_seen)
 305                 return 0;
 306         if (trigger)
 307                 rxq->trigger_seen = trigger;
 308         rte_compiler_barrier();
 309         for (num_rx = 0; num_rx < nb_pkts; ) {
 310                 struct rte_mbuf *mbuf = rxq->pool;
 311                 struct rte_mbuf *seg = NULL;
 312                 struct rte_mbuf *new_tail = NULL;
 313                 uint16_t data_off = rte_pktmbuf_headroom(mbuf);
 314                 int len;
 315
 316                 len = readv(rxq->fd, *rxq->iovecs,
 317                             1 +
 318                             (rxq->rxmode->offloads & DEV_RX_OFFLOAD_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                 if (rxq->rxmode->offloads & DEV_RX_OFFLOAD_CHECKSUM)
 375                         tap_verify_csum(mbuf);
 376
 377                 /* account for the receive frame */
 378                 bufs[num_rx++] = mbuf;
 379                 num_rx_bytes += mbuf->pkt_len;
 380         }
 381 end:
 382         rxq->stats.ipackets += num_rx;
 383         rxq->stats.ibytes += num_rx_bytes;
 384
 385         return num_rx;
 386 }
 387
 388 static uint64_t
 389 tap_tx_offload_get_port_capa(void)
 390 {
 391         /*
 392          * In order to support legacy apps,
 393          * report capabilities also as port capabilities.
 394          */
 395         return DEV_TX_OFFLOAD_MULTI_SEGS |
 396                DEV_TX_OFFLOAD_IPV4_CKSUM |
 397                DEV_TX_OFFLOAD_UDP_CKSUM |
 398                DEV_TX_OFFLOAD_TCP_CKSUM;
 399 }
 400
 401 static uint64_t
 402 tap_tx_offload_get_queue_capa(void)
 403 {
 404         return DEV_TX_OFFLOAD_MULTI_SEGS |
 405                DEV_TX_OFFLOAD_IPV4_CKSUM |
 406                DEV_TX_OFFLOAD_UDP_CKSUM |
 407                DEV_TX_OFFLOAD_TCP_CKSUM;
 408 }
 409
 410 static bool
 411 tap_txq_are_offloads_valid(struct rte_eth_dev *dev, uint64_t offloads)
 412 {
 413         uint64_t port_offloads = dev->data->dev_conf.txmode.offloads;
 414         uint64_t queue_supp_offloads = tap_tx_offload_get_queue_capa();
 415         uint64_t port_supp_offloads = tap_tx_offload_get_port_capa();
 416
 417         if ((offloads & (queue_supp_offloads | port_supp_offloads)) !=
 418             offloads)
 419                 return false;
 420         /* Verify we have no conflict with port offloads */
 421         if ((port_offloads ^ offloads) & port_supp_offloads)
 422                 return false;
 423         return true;
 424 }
 425
 426 static void
 427 tap_tx_offload(char *packet, uint64_t ol_flags, unsigned int l2_len,
 428                unsigned int l3_len)
 429 {
 430         void *l3_hdr = packet + l2_len;
 431
 432         if (ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4)) {
 433                 struct ipv4_hdr *iph = l3_hdr;
 434                 uint16_t cksum;
 435
 436                 iph->hdr_checksum = 0;
 437                 cksum = rte_raw_cksum(iph, l3_len);
 438                 iph->hdr_checksum = (cksum == 0xffff) ? cksum : ~cksum;
 439         }
 440         if (ol_flags & PKT_TX_L4_MASK) {
 441                 uint16_t l4_len;
 442                 uint32_t cksum;
 443                 uint16_t *l4_cksum;
 444                 void *l4_hdr;
 445
 446                 l4_hdr = packet + l2_len + l3_len;
 447                 if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM)
 448                         l4_cksum = &((struct udp_hdr *)l4_hdr)->dgram_cksum;
 449                 else if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM)
 450                         l4_cksum = &((struct tcp_hdr *)l4_hdr)->cksum;
 451                 else
 452                         return;
 453                 *l4_cksum = 0;
 454                 if (ol_flags & PKT_TX_IPV4) {
 455                         struct ipv4_hdr *iph = l3_hdr;
 456
 457                         l4_len = rte_be_to_cpu_16(iph->total_length) - l3_len;
 458                         cksum = rte_ipv4_phdr_cksum(l3_hdr, 0);
 459                 } else {
 460                         struct ipv6_hdr *ip6h = l3_hdr;
 461
 462                         /* payload_len does not include ext headers */
 463                         l4_len = rte_be_to_cpu_16(ip6h->payload_len) -
 464                                 l3_len + sizeof(struct ipv6_hdr);
 465                         cksum = rte_ipv6_phdr_cksum(l3_hdr, 0);
 466                 }
 467                 cksum += rte_raw_cksum(l4_hdr, l4_len);
 468                 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
 469                 cksum = (~cksum) & 0xffff;
 470                 if (cksum == 0)
 471                         cksum = 0xffff;
 472                 *l4_cksum = cksum;
 473         }
 474 }
 475
 476 /* Callback to handle sending packets from the tap interface
 477  */
 478 static uint16_t
 479 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 480 {
 481         struct tx_queue *txq = queue;
 482         uint16_t num_tx = 0;
 483         unsigned long num_tx_bytes = 0;
 484         uint32_t max_size;
 485         int i;
 486
 487         if (unlikely(nb_pkts == 0))
 488                 return 0;
 489
 490         max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4);
 491         for (i = 0; i < nb_pkts; i++) {
 492                 struct rte_mbuf *mbuf = bufs[num_tx];
 493                 struct iovec iovecs[mbuf->nb_segs + 1];
 494                 struct tun_pi pi = { .flags = 0 };
 495                 struct rte_mbuf *seg = mbuf;
 496                 char m_copy[mbuf->data_len];
 497                 int n;
 498                 int j;
 499
 500                 /* stats.errs will be incremented */
 501                 if (rte_pktmbuf_pkt_len(mbuf) > max_size)
 502                         break;
 503
 504                 iovecs[0].iov_base = &pi;
 505                 iovecs[0].iov_len = sizeof(pi);
 506                 for (j = 1; j <= mbuf->nb_segs; j++) {
 507                         iovecs[j].iov_len = rte_pktmbuf_data_len(seg);
 508                         iovecs[j].iov_base =
 509                                 rte_pktmbuf_mtod(seg, void *);
 510                         seg = seg->next;
 511                 }
 512                 if (txq->csum &&
 513                     ((mbuf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4) ||
 514                      (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM ||
 515                      (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM))) {
 516                         /* Support only packets with all data in the same seg */
 517                         if (mbuf->nb_segs > 1)
 518                                 break;
 519                         /* To change checksums, work on a copy of data. */
 520                         rte_memcpy(m_copy, rte_pktmbuf_mtod(mbuf, void *),
 521                                    rte_pktmbuf_data_len(mbuf));
 522                         tap_tx_offload(m_copy, mbuf->ol_flags,
 523                                        mbuf->l2_len, mbuf->l3_len);
 524                         iovecs[1].iov_base = m_copy;
 525                 }
 526                 /* copy the tx frame data */
 527                 n = writev(txq->fd, iovecs, mbuf->nb_segs + 1);
 528                 if (n <= 0)
 529                         break;
 530
 531                 num_tx++;
 532                 num_tx_bytes += mbuf->pkt_len;
 533                 rte_pktmbuf_free(mbuf);
 534         }
 535
 536         txq->stats.opackets += num_tx;
 537         txq->stats.errs += nb_pkts - num_tx;
 538         txq->stats.obytes += num_tx_bytes;
 539
 540         return num_tx;
 541 }
 542
 543 static const char *
 544 tap_ioctl_req2str(unsigned long request)
 545 {
 546         switch (request) {
 547         case SIOCSIFFLAGS:
 548                 return "SIOCSIFFLAGS";
 549         case SIOCGIFFLAGS:
 550                 return "SIOCGIFFLAGS";
 551         case SIOCGIFHWADDR:
 552                 return "SIOCGIFHWADDR";
 553         case SIOCSIFHWADDR:
 554                 return "SIOCSIFHWADDR";
 555         case SIOCSIFMTU:
 556                 return "SIOCSIFMTU";
 557         }
 558         return "UNKNOWN";
 559 }
 560
 561 static int
 562 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 563           struct ifreq *ifr, int set, enum ioctl_mode mode)
 564 {
 565         short req_flags = ifr->ifr_flags;
 566         int remote = pmd->remote_if_index &&
 567                 (mode == REMOTE_ONLY || mode == LOCAL_AND_REMOTE);
 568
 569         if (!pmd->remote_if_index && mode == REMOTE_ONLY)
 570                 return 0;
 571         /*
 572          * If there is a remote netdevice, apply ioctl on it, then apply it on
 573          * the tap netdevice.
 574          */
 575 apply:
 576         if (remote)
 577                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->remote_iface);
 578         else if (mode == LOCAL_ONLY || mode == LOCAL_AND_REMOTE)
 579                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->name);
 580         switch (request) {
 581         case SIOCSIFFLAGS:
 582                 /* fetch current flags to leave other flags untouched */
 583                 if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
 584                         goto error;
 585                 if (set)
 586                         ifr->ifr_flags |= req_flags;
 587                 else
 588                         ifr->ifr_flags &= ~req_flags;
 589                 break;
 590         case SIOCGIFFLAGS:
 591         case SIOCGIFHWADDR:
 592         case SIOCSIFHWADDR:
 593         case SIOCSIFMTU:
 594                 break;
 595         default:
 596                 RTE_ASSERT(!"unsupported request type: must not happen");
 597         }
 598         if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
 599                 goto error;
 600         if (remote-- && mode == LOCAL_AND_REMOTE)
 601                 goto apply;
 602         return 0;
 603
 604 error:
 605         RTE_LOG(DEBUG, PMD, "%s: %s(%s) failed: %s(%d)\n", ifr->ifr_name,
 606                 __func__, tap_ioctl_req2str(request), strerror(errno), errno);
 607         return -errno;
 608 }
 609
 610 static int
 611 tap_link_set_down(struct rte_eth_dev *dev)
 612 {
 613         struct pmd_internals *pmd = dev->data->dev_private;
 614         struct ifreq ifr = { .ifr_flags = IFF_UP };
 615
 616         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 617         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_ONLY);
 618 }
 619
 620 static int
 621 tap_link_set_up(struct rte_eth_dev *dev)
 622 {
 623         struct pmd_internals *pmd = dev->data->dev_private;
 624         struct ifreq ifr = { .ifr_flags = IFF_UP };
 625
 626         dev->data->dev_link.link_status = ETH_LINK_UP;
 627         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 628 }
 629
 630 static int
 631 tap_dev_start(struct rte_eth_dev *dev)
 632 {
 633         int err;
 634
 635         err = tap_intr_handle_set(dev, 1);
 636         if (err)
 637                 return err;
 638         return tap_link_set_up(dev);
 639 }
 640
 641 /* This function gets called when the current port gets stopped.
 642  */
 643 static void
 644 tap_dev_stop(struct rte_eth_dev *dev)
 645 {
 646         tap_intr_handle_set(dev, 0);
 647         tap_link_set_down(dev);
 648 }
 649
 650 static int
 651 tap_dev_configure(struct rte_eth_dev *dev)
 652 {
 653         uint64_t supp_tx_offloads = tap_tx_offload_get_port_capa();
 654         uint64_t tx_offloads = dev->data->dev_conf.txmode.offloads;
 655
 656         if ((tx_offloads & supp_tx_offloads) != tx_offloads) {
 657                 rte_errno = ENOTSUP;
 658                 RTE_LOG(ERR, PMD,
 659                         "Some Tx offloads are not supported "
 660                         "requested 0x%" PRIx64 " supported 0x%" PRIx64 "\n",
 661                         tx_offloads, supp_tx_offloads);
 662                 return -rte_errno;
 663         }
 664         if (dev->data->nb_rx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 665                 RTE_LOG(ERR, PMD,
 666                         "%s: number of rx queues %d exceeds max num of queues %d\n",
 667                         dev->device->name,
 668                         dev->data->nb_rx_queues,
 669                         RTE_PMD_TAP_MAX_QUEUES);
 670                 return -1;
 671         }
 672         if (dev->data->nb_tx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 673                 RTE_LOG(ERR, PMD,
 674                         "%s: number of tx queues %d exceeds max num of queues %d\n",
 675                         dev->device->name,
 676                         dev->data->nb_tx_queues,
 677                         RTE_PMD_TAP_MAX_QUEUES);
 678                 return -1;
 679         }
 680
 681         RTE_LOG(INFO, PMD, "%s: %p: TX configured queues number: %u\n",
 682              dev->device->name, (void *)dev, dev->data->nb_tx_queues);
 683
 684         RTE_LOG(INFO, PMD, "%s: %p: RX configured queues number: %u\n",
 685              dev->device->name, (void *)dev, dev->data->nb_rx_queues);
 686
 687         return 0;
 688 }
 689
 690 static uint32_t
 691 tap_dev_speed_capa(void)
 692 {
 693         uint32_t speed = pmd_link.link_speed;
 694         uint32_t capa = 0;
 695
 696         if (speed >= ETH_SPEED_NUM_10M)
 697                 capa |= ETH_LINK_SPEED_10M;
 698         if (speed >= ETH_SPEED_NUM_100M)
 699                 capa |= ETH_LINK_SPEED_100M;
 700         if (speed >= ETH_SPEED_NUM_1G)
 701                 capa |= ETH_LINK_SPEED_1G;
 702         if (speed >= ETH_SPEED_NUM_5G)
 703                 capa |= ETH_LINK_SPEED_2_5G;
 704         if (speed >= ETH_SPEED_NUM_5G)
 705                 capa |= ETH_LINK_SPEED_5G;
 706         if (speed >= ETH_SPEED_NUM_10G)
 707                 capa |= ETH_LINK_SPEED_10G;
 708         if (speed >= ETH_SPEED_NUM_20G)
 709                 capa |= ETH_LINK_SPEED_20G;
 710         if (speed >= ETH_SPEED_NUM_25G)
 711                 capa |= ETH_LINK_SPEED_25G;
 712         if (speed >= ETH_SPEED_NUM_40G)
 713                 capa |= ETH_LINK_SPEED_40G;
 714         if (speed >= ETH_SPEED_NUM_50G)
 715                 capa |= ETH_LINK_SPEED_50G;
 716         if (speed >= ETH_SPEED_NUM_56G)
 717                 capa |= ETH_LINK_SPEED_56G;
 718         if (speed >= ETH_SPEED_NUM_100G)
 719                 capa |= ETH_LINK_SPEED_100G;
 720
 721         return capa;
 722 }
 723
 724 static void
 725 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 726 {
 727         struct pmd_internals *internals = dev->data->dev_private;
 728
 729         dev_info->if_index = internals->if_index;
 730         dev_info->max_mac_addrs = 1;
 731         dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
 732         dev_info->max_rx_queues = RTE_PMD_TAP_MAX_QUEUES;
 733         dev_info->max_tx_queues = RTE_PMD_TAP_MAX_QUEUES;
 734         dev_info->min_rx_bufsize = 0;
 735         dev_info->pci_dev = NULL;
 736         dev_info->speed_capa = tap_dev_speed_capa();
 737         dev_info->rx_queue_offload_capa = tap_rx_offload_get_queue_capa();
 738         dev_info->rx_offload_capa = tap_rx_offload_get_port_capa() |
 739                                     dev_info->rx_queue_offload_capa;
 740         dev_info->tx_queue_offload_capa = tap_tx_offload_get_queue_capa();
 741         dev_info->tx_offload_capa = tap_tx_offload_get_port_capa() |
 742                                     dev_info->tx_queue_offload_capa;
 743 }
 744
 745 static int
 746 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
 747 {
 748         unsigned int i, imax;
 749         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 750         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 751         unsigned long rx_nombuf = 0, ierrors = 0;
 752         const struct pmd_internals *pmd = dev->data->dev_private;
 753
 754         /* rx queue statistics */
 755         imax = (dev->data->nb_rx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 756                 dev->data->nb_rx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 757         for (i = 0; i < imax; i++) {
 758                 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
 759                 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
 760                 rx_total += tap_stats->q_ipackets[i];
 761                 rx_bytes_total += tap_stats->q_ibytes[i];
 762                 rx_nombuf += pmd->rxq[i].stats.rx_nombuf;
 763                 ierrors += pmd->rxq[i].stats.ierrors;
 764         }
 765
 766         /* tx queue statistics */
 767         imax = (dev->data->nb_tx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 768                 dev->data->nb_tx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 769
 770         for (i = 0; i < imax; i++) {
 771                 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
 772                 tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
 773                 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
 774                 tx_total += tap_stats->q_opackets[i];
 775                 tx_err_total += tap_stats->q_errors[i];
 776                 tx_bytes_total += tap_stats->q_obytes[i];
 777         }
 778
 779         tap_stats->ipackets = rx_total;
 780         tap_stats->ibytes = rx_bytes_total;
 781         tap_stats->ierrors = ierrors;
 782         tap_stats->rx_nombuf = rx_nombuf;
 783         tap_stats->opackets = tx_total;
 784         tap_stats->oerrors = tx_err_total;
 785         tap_stats->obytes = tx_bytes_total;
 786         return 0;
 787 }
 788
 789 static void
 790 tap_stats_reset(struct rte_eth_dev *dev)
 791 {
 792         int i;
 793         struct pmd_internals *pmd = dev->data->dev_private;
 794
 795         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 796                 pmd->rxq[i].stats.ipackets = 0;
 797                 pmd->rxq[i].stats.ibytes = 0;
 798                 pmd->rxq[i].stats.ierrors = 0;
 799                 pmd->rxq[i].stats.rx_nombuf = 0;
 800
 801                 pmd->txq[i].stats.opackets = 0;
 802                 pmd->txq[i].stats.errs = 0;
 803                 pmd->txq[i].stats.obytes = 0;
 804         }
 805 }
 806
 807 static void
 808 tap_dev_close(struct rte_eth_dev *dev)
 809 {
 810         int i;
 811         struct pmd_internals *internals = dev->data->dev_private;
 812
 813         tap_link_set_down(dev);
 814         tap_flow_flush(dev, NULL);
 815         tap_flow_implicit_flush(internals, NULL);
 816
 817         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 818                 if (internals->rxq[i].fd != -1) {
 819                         close(internals->rxq[i].fd);
 820                         internals->rxq[i].fd = -1;
 821                 }
 822                 if (internals->txq[i].fd != -1) {
 823                         close(internals->txq[i].fd);
 824                         internals->txq[i].fd = -1;
 825                 }
 826         }
 827
 828         if (internals->remote_if_index) {
 829                 /* Restore initial remote state */
 830                 ioctl(internals->ioctl_sock, SIOCSIFFLAGS,
 831                                 &internals->remote_initial_flags);
 832         }
 833 }
 834
 835 static void
 836 tap_rx_queue_release(void *queue)
 837 {
 838         struct rx_queue *rxq = queue;
 839
 840         if (rxq && (rxq->fd > 0)) {
 841                 close(rxq->fd);
 842                 rxq->fd = -1;
 843                 rte_pktmbuf_free(rxq->pool);
 844                 rte_free(rxq->iovecs);
 845                 rxq->pool = NULL;
 846                 rxq->iovecs = NULL;
 847         }
 848 }
 849
 850 static void
 851 tap_tx_queue_release(void *queue)
 852 {
 853         struct tx_queue *txq = queue;
 854
 855         if (txq && (txq->fd > 0)) {
 856                 close(txq->fd);
 857                 txq->fd = -1;
 858         }
 859 }
 860
 861 static int
 862 tap_link_update(struct rte_eth_dev *dev, int wait_to_complete __rte_unused)
 863 {
 864         struct rte_eth_link *dev_link = &dev->data->dev_link;
 865         struct pmd_internals *pmd = dev->data->dev_private;
 866         struct ifreq ifr = { .ifr_flags = 0 };
 867
 868         if (pmd->remote_if_index) {
 869                 tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, REMOTE_ONLY);
 870                 if (!(ifr.ifr_flags & IFF_UP) ||
 871                     !(ifr.ifr_flags & IFF_RUNNING)) {
 872                         dev_link->link_status = ETH_LINK_DOWN;
 873                         return 0;
 874                 }
 875         }
 876         tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, LOCAL_ONLY);
 877         dev_link->link_status =
 878                 ((ifr.ifr_flags & IFF_UP) && (ifr.ifr_flags & IFF_RUNNING) ?
 879                  ETH_LINK_UP :
 880                  ETH_LINK_DOWN);
 881         return 0;
 882 }
 883
 884 static void
 885 tap_promisc_enable(struct rte_eth_dev *dev)
 886 {
 887         struct pmd_internals *pmd = dev->data->dev_private;
 888         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 889
 890         dev->data->promiscuous = 1;
 891         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 892         if (pmd->remote_if_index && !pmd->flow_isolate)
 893                 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC);
 894 }
 895
 896 static void
 897 tap_promisc_disable(struct rte_eth_dev *dev)
 898 {
 899         struct pmd_internals *pmd = dev->data->dev_private;
 900         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 901
 902         dev->data->promiscuous = 0;
 903         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 904         if (pmd->remote_if_index && !pmd->flow_isolate)
 905                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC);
 906 }
 907
 908 static void
 909 tap_allmulti_enable(struct rte_eth_dev *dev)
 910 {
 911         struct pmd_internals *pmd = dev->data->dev_private;
 912         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 913
 914         dev->data->all_multicast = 1;
 915         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 916         if (pmd->remote_if_index && !pmd->flow_isolate)
 917                 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI);
 918 }
 919
 920 static void
 921 tap_allmulti_disable(struct rte_eth_dev *dev)
 922 {
 923         struct pmd_internals *pmd = dev->data->dev_private;
 924         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 925
 926         dev->data->all_multicast = 0;
 927         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 928         if (pmd->remote_if_index && !pmd->flow_isolate)
 929                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI);
 930 }
 931
 932 static void
 933 tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
 934 {
 935         struct pmd_internals *pmd = dev->data->dev_private;
 936         enum ioctl_mode mode = LOCAL_ONLY;
 937         struct ifreq ifr;
 938
 939         if (is_zero_ether_addr(mac_addr)) {
 940                 RTE_LOG(ERR, PMD, "%s: can't set an empty MAC address\n",
 941                         dev->device->name);
 942                 return;
 943         }
 944         /* Check the actual current MAC address on the tap netdevice */
 945         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
 946                 return;
 947         if (is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 948                                mac_addr))
 949                 return;
 950         /* Check the current MAC address on the remote */
 951         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0)
 952                 return;
 953         if (!is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 954                                mac_addr))
 955                 mode = LOCAL_AND_REMOTE;
 956         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
 957         rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETHER_ADDR_LEN);
 958         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1, mode) < 0)
 959                 return;
 960         rte_memcpy(&pmd->eth_addr, mac_addr, ETHER_ADDR_LEN);
 961         if (pmd->remote_if_index && !pmd->flow_isolate) {
 962                 /* Replace MAC redirection rule after a MAC change */
 963                 if (tap_flow_implicit_destroy(pmd, TAP_REMOTE_LOCAL_MAC) < 0) {
 964                         RTE_LOG(ERR, PMD,
 965                                 "%s: Couldn't delete MAC redirection rule\n",
 966                                 dev->device->name);
 967                         return;
 968                 }
 969                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0)
 970                         RTE_LOG(ERR, PMD,
 971                                 "%s: Couldn't add MAC redirection rule\n",
 972                                 dev->device->name);
 973         }
 974 }
 975
 976 static int
 977 tap_setup_queue(struct rte_eth_dev *dev,
 978                 struct pmd_internals *internals,
 979                 uint16_t qid,
 980                 int is_rx)
 981 {
 982         int *fd;
 983         int *other_fd;
 984         const char *dir;
 985         struct pmd_internals *pmd = dev->data->dev_private;
 986         struct rx_queue *rx = &internals->rxq[qid];
 987         struct tx_queue *tx = &internals->txq[qid];
 988
 989         if (is_rx) {
 990                 fd = &rx->fd;
 991                 other_fd = &tx->fd;
 992                 dir = "rx";
 993         } else {
 994                 fd = &tx->fd;
 995                 other_fd = &rx->fd;
 996                 dir = "tx";
 997         }
 998         if (*fd != -1) {
 999                 /* fd for this queue already exists */
1000                 RTE_LOG(DEBUG, PMD, "%s: fd %d for %s queue qid %d exists\n",
1001                         pmd->name, *fd, dir, qid);
1002         } else if (*other_fd != -1) {
1003                 /* Only other_fd exists. dup it */
1004                 *fd = dup(*other_fd);
1005                 if (*fd < 0) {
1006                         *fd = -1;
1007                         RTE_LOG(ERR, PMD, "%s: dup() failed.\n",
1008                                 pmd->name);
1009                         return -1;
1010                 }
1011                 RTE_LOG(DEBUG, PMD, "%s: dup fd %d for %s queue qid %d (%d)\n",
1012                         pmd->name, *other_fd, dir, qid, *fd);
1013         } else {
1014                 /* Both RX and TX fds do not exist (equal -1). Create fd */
1015                 *fd = tun_alloc(pmd);
1016                 if (*fd < 0) {
1017                         *fd = -1; /* restore original value */
1018                         RTE_LOG(ERR, PMD, "%s: tun_alloc() failed.\n",
1019                                 pmd->name);
1020                         return -1;
1021                 }
1022                 RTE_LOG(DEBUG, PMD, "%s: add %s queue for qid %d fd %d\n",
1023                         pmd->name, dir, qid, *fd);
1024         }
1025
1026         tx->mtu = &dev->data->mtu;
1027         rx->rxmode = &dev->data->dev_conf.rxmode;
1028
1029         return *fd;
1030 }
1031
1032 static int
1033 tap_rx_queue_setup(struct rte_eth_dev *dev,
1034                    uint16_t rx_queue_id,
1035                    uint16_t nb_rx_desc,
1036                    unsigned int socket_id,
1037                    const struct rte_eth_rxconf *rx_conf __rte_unused,
1038                    struct rte_mempool *mp)
1039 {
1040         struct pmd_internals *internals = dev->data->dev_private;
1041         struct rx_queue *rxq = &internals->rxq[rx_queue_id];
1042         struct rte_mbuf **tmp = &rxq->pool;
1043         long iov_max = sysconf(_SC_IOV_MAX);
1044         uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
1045         struct iovec (*iovecs)[nb_desc + 1];
1046         int data_off = RTE_PKTMBUF_HEADROOM;
1047         int ret = 0;
1048         int fd;
1049         int i;
1050
1051         if (rx_queue_id >= dev->data->nb_rx_queues || !mp) {
1052                 RTE_LOG(WARNING, PMD,
1053                         "nb_rx_queues %d too small or mempool NULL\n",
1054                         dev->data->nb_rx_queues);
1055                 return -1;
1056         }
1057
1058         /* Verify application offloads are valid for our port and queue. */
1059         if (!tap_rxq_are_offloads_valid(dev, rx_conf->offloads)) {
1060                 rte_errno = ENOTSUP;
1061                 RTE_LOG(ERR, PMD,
1062                         "%p: Rx queue offloads 0x%" PRIx64
1063                         " don't match port offloads 0x%" PRIx64
1064                         " or supported offloads 0x%" PRIx64 "\n",
1065                         (void *)dev, rx_conf->offloads,
1066                         dev->data->dev_conf.rxmode.offloads,
1067                         (tap_rx_offload_get_port_capa() |
1068                          tap_rx_offload_get_queue_capa()));
1069                 return -rte_errno;
1070         }
1071         rxq->mp = mp;
1072         rxq->trigger_seen = 1; /* force initial burst */
1073         rxq->in_port = dev->data->port_id;
1074         rxq->nb_rx_desc = nb_desc;
1075         iovecs = rte_zmalloc_socket(dev->device->name, sizeof(*iovecs), 0,
1076                                     socket_id);
1077         if (!iovecs) {
1078                 RTE_LOG(WARNING, PMD,
1079                         "%s: Couldn't allocate %d RX descriptors\n",
1080                         dev->device->name, nb_desc);
1081                 return -ENOMEM;
1082         }
1083         rxq->iovecs = iovecs;
1084
1085         dev->data->rx_queues[rx_queue_id] = rxq;
1086         fd = tap_setup_queue(dev, internals, rx_queue_id, 1);
1087         if (fd == -1) {
1088                 ret = fd;
1089                 goto error;
1090         }
1091
1092         (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
1093         (*rxq->iovecs)[0].iov_base = &rxq->pi;
1094
1095         for (i = 1; i <= nb_desc; i++) {
1096                 *tmp = rte_pktmbuf_alloc(rxq->mp);
1097                 if (!*tmp) {
1098                         RTE_LOG(WARNING, PMD,
1099                                 "%s: couldn't allocate memory for queue %d\n",
1100                                 dev->device->name, rx_queue_id);
1101                         ret = -ENOMEM;
1102                         goto error;
1103                 }
1104                 (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off;
1105                 (*rxq->iovecs)[i].iov_base =
1106                         (char *)(*tmp)->buf_addr + data_off;
1107                 data_off = 0;
1108                 tmp = &(*tmp)->next;
1109         }
1110
1111         RTE_LOG(DEBUG, PMD, "  RX TAP device name %s, qid %d on fd %d\n",
1112                 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
1113
1114         return 0;
1115
1116 error:
1117         rte_pktmbuf_free(rxq->pool);
1118         rxq->pool = NULL;
1119         rte_free(rxq->iovecs);
1120         rxq->iovecs = NULL;
1121         return ret;
1122 }
1123
1124 static int
1125 tap_tx_queue_setup(struct rte_eth_dev *dev,
1126                    uint16_t tx_queue_id,
1127                    uint16_t nb_tx_desc __rte_unused,
1128                    unsigned int socket_id __rte_unused,
1129                    const struct rte_eth_txconf *tx_conf)
1130 {
1131         struct pmd_internals *internals = dev->data->dev_private;
1132         struct tx_queue *txq;
1133         int ret;
1134
1135         if (tx_queue_id >= dev->data->nb_tx_queues)
1136                 return -1;
1137         dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
1138         txq = dev->data->tx_queues[tx_queue_id];
1139         /*
1140          * Don't verify port offloads for application which
1141          * use the old API.
1142          */
1143         if (tx_conf != NULL &&
1144             !!(tx_conf->txq_flags & ETH_TXQ_FLAGS_IGNORE)) {
1145                 if (tap_txq_are_offloads_valid(dev, tx_conf->offloads)) {
1146                         txq->csum = !!(tx_conf->offloads &
1147                                         (DEV_TX_OFFLOAD_IPV4_CKSUM |
1148                                          DEV_TX_OFFLOAD_UDP_CKSUM |
1149                                          DEV_TX_OFFLOAD_TCP_CKSUM));
1150                 } else {
1151                         rte_errno = ENOTSUP;
1152                         RTE_LOG(ERR, PMD,
1153                                 "%p: Tx queue offloads 0x%" PRIx64
1154                                 " don't match port offloads 0x%" PRIx64
1155                                 " or supported offloads 0x%" PRIx64,
1156                                 (void *)dev, tx_conf->offloads,
1157                                 dev->data->dev_conf.txmode.offloads,
1158                                 tap_tx_offload_get_port_capa());
1159                         return -rte_errno;
1160                 }
1161         }
1162         ret = tap_setup_queue(dev, internals, tx_queue_id, 0);
1163         if (ret == -1)
1164                 return -1;
1165         RTE_LOG(DEBUG, PMD,
1166                 "  TX TAP device name %s, qid %d on fd %d csum %s\n",
1167                 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd,
1168                 txq->csum ? "on" : "off");
1169
1170         return 0;
1171 }
1172
1173 static int
1174 tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
1175 {
1176         struct pmd_internals *pmd = dev->data->dev_private;
1177         struct ifreq ifr = { .ifr_mtu = mtu };
1178         int err = 0;
1179
1180         err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE);
1181         if (!err)
1182                 dev->data->mtu = mtu;
1183
1184         return err;
1185 }
1186
1187 static int
1188 tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
1189                      struct ether_addr *mc_addr_set __rte_unused,
1190                      uint32_t nb_mc_addr __rte_unused)
1191 {
1192         /*
1193          * Nothing to do actually: the tap has no filtering whatsoever, every
1194          * packet is received.
1195          */
1196         return 0;
1197 }
1198
1199 static int
1200 tap_nl_msg_handler(struct nlmsghdr *nh, void *arg)
1201 {
1202         struct rte_eth_dev *dev = arg;
1203         struct pmd_internals *pmd = dev->data->dev_private;
1204         struct ifinfomsg *info = NLMSG_DATA(nh);
1205
1206         if (nh->nlmsg_type != RTM_NEWLINK ||
1207             (info->ifi_index != pmd->if_index &&
1208              info->ifi_index != pmd->remote_if_index))
1209                 return 0;
1210         return tap_link_update(dev, 0);
1211 }
1212
1213 static void
1214 tap_dev_intr_handler(void *cb_arg)
1215 {
1216         struct rte_eth_dev *dev = cb_arg;
1217         struct pmd_internals *pmd = dev->data->dev_private;
1218
1219         tap_nl_recv(pmd->intr_handle.fd, tap_nl_msg_handler, dev);
1220 }
1221
1222 static int
1223 tap_lsc_intr_handle_set(struct rte_eth_dev *dev, int set)
1224 {
1225         struct pmd_internals *pmd = dev->data->dev_private;
1226
1227         /* In any case, disable interrupt if the conf is no longer there. */
1228         if (!dev->data->dev_conf.intr_conf.lsc) {
1229                 if (pmd->intr_handle.fd != -1) {
1230                         tap_nl_final(pmd->intr_handle.fd);
1231                         rte_intr_callback_unregister(&pmd->intr_handle,
1232                                 tap_dev_intr_handler, dev);
1233                 }
1234                 return 0;
1235         }
1236         if (set) {
1237                 pmd->intr_handle.fd = tap_nl_init(RTMGRP_LINK);
1238                 if (unlikely(pmd->intr_handle.fd == -1))
1239                         return -EBADF;
1240                 return rte_intr_callback_register(
1241                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1242         }
1243         tap_nl_final(pmd->intr_handle.fd);
1244         return rte_intr_callback_unregister(&pmd->intr_handle,
1245                                             tap_dev_intr_handler, dev);
1246 }
1247
1248 static int
1249 tap_intr_handle_set(struct rte_eth_dev *dev, int set)
1250 {
1251         int err;
1252
1253         err = tap_lsc_intr_handle_set(dev, set);
1254         if (err)
1255                 return err;
1256         err = tap_rx_intr_vec_set(dev, set);
1257         if (err && set)
1258                 tap_lsc_intr_handle_set(dev, 0);
1259         return err;
1260 }
1261
1262 static const uint32_t*
1263 tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused)
1264 {
1265         static const uint32_t ptypes[] = {
1266                 RTE_PTYPE_INNER_L2_ETHER,
1267                 RTE_PTYPE_INNER_L2_ETHER_VLAN,
1268                 RTE_PTYPE_INNER_L2_ETHER_QINQ,
1269                 RTE_PTYPE_INNER_L3_IPV4,
1270                 RTE_PTYPE_INNER_L3_IPV4_EXT,
1271                 RTE_PTYPE_INNER_L3_IPV6,
1272                 RTE_PTYPE_INNER_L3_IPV6_EXT,
1273                 RTE_PTYPE_INNER_L4_FRAG,
1274                 RTE_PTYPE_INNER_L4_UDP,
1275                 RTE_PTYPE_INNER_L4_TCP,
1276                 RTE_PTYPE_INNER_L4_SCTP,
1277                 RTE_PTYPE_L2_ETHER,
1278                 RTE_PTYPE_L2_ETHER_VLAN,
1279                 RTE_PTYPE_L2_ETHER_QINQ,
1280                 RTE_PTYPE_L3_IPV4,
1281                 RTE_PTYPE_L3_IPV4_EXT,
1282                 RTE_PTYPE_L3_IPV6_EXT,
1283                 RTE_PTYPE_L3_IPV6,
1284                 RTE_PTYPE_L4_FRAG,
1285                 RTE_PTYPE_L4_UDP,
1286                 RTE_PTYPE_L4_TCP,
1287                 RTE_PTYPE_L4_SCTP,
1288         };
1289
1290         return ptypes;
1291 }
1292
1293 static int
1294 tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused,
1295                   struct rte_eth_fc_conf *fc_conf)
1296 {
1297         fc_conf->mode = RTE_FC_NONE;
1298         return 0;
1299 }
1300
1301 static int
1302 tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused,
1303                   struct rte_eth_fc_conf *fc_conf)
1304 {
1305         if (fc_conf->mode != RTE_FC_NONE)
1306                 return -ENOTSUP;
1307         return 0;
1308 }
1309
1310 static const struct eth_dev_ops ops = {
1311         .dev_start              = tap_dev_start,
1312         .dev_stop               = tap_dev_stop,
1313         .dev_close              = tap_dev_close,
1314         .dev_configure          = tap_dev_configure,
1315         .dev_infos_get          = tap_dev_info,
1316         .rx_queue_setup         = tap_rx_queue_setup,
1317         .tx_queue_setup         = tap_tx_queue_setup,
1318         .rx_queue_release       = tap_rx_queue_release,
1319         .tx_queue_release       = tap_tx_queue_release,
1320         .flow_ctrl_get          = tap_flow_ctrl_get,
1321         .flow_ctrl_set          = tap_flow_ctrl_set,
1322         .link_update            = tap_link_update,
1323         .dev_set_link_up        = tap_link_set_up,
1324         .dev_set_link_down      = tap_link_set_down,
1325         .promiscuous_enable     = tap_promisc_enable,
1326         .promiscuous_disable    = tap_promisc_disable,
1327         .allmulticast_enable    = tap_allmulti_enable,
1328         .allmulticast_disable   = tap_allmulti_disable,
1329         .mac_addr_set           = tap_mac_set,
1330         .mtu_set                = tap_mtu_set,
1331         .set_mc_addr_list       = tap_set_mc_addr_list,
1332         .stats_get              = tap_stats_get,
1333         .stats_reset            = tap_stats_reset,
1334         .dev_supported_ptypes_get = tap_dev_supported_ptypes_get,
1335         .filter_ctrl            = tap_dev_filter_ctrl,
1336 };
1337
1338 static int
1339 eth_dev_tap_create(struct rte_vdev_device *vdev, char *tap_name,
1340                    char *remote_iface, int fixed_mac_type)
1341 {
1342         int numa_node = rte_socket_id();
1343         struct rte_eth_dev *dev;
1344         struct pmd_internals *pmd;
1345         struct rte_eth_dev_data *data;
1346         struct ifreq ifr;
1347         int i;
1348
1349         RTE_LOG(DEBUG, PMD, "  TAP device on numa %u\n", rte_socket_id());
1350
1351         data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node);
1352         if (!data) {
1353                 RTE_LOG(ERR, PMD, "TAP Failed to allocate data\n");
1354                 goto error_exit_nodev;
1355         }
1356
1357         dev = rte_eth_vdev_allocate(vdev, sizeof(*pmd));
1358         if (!dev) {
1359                 RTE_LOG(ERR, PMD, "TAP Unable to allocate device struct\n");
1360                 goto error_exit_nodev;
1361         }
1362
1363         pmd = dev->data->dev_private;
1364         pmd->dev = dev;
1365         snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
1366
1367         pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
1368         if (pmd->ioctl_sock == -1) {
1369                 RTE_LOG(ERR, PMD,
1370                         "TAP Unable to get a socket for management: %s\n",
1371                         strerror(errno));
1372                 goto error_exit;
1373         }
1374
1375         /* Setup some default values */
1376         rte_memcpy(data, dev->data, sizeof(*data));
1377         data->dev_private = pmd;
1378         data->dev_flags = RTE_ETH_DEV_INTR_LSC;
1379         data->numa_node = numa_node;
1380
1381         data->dev_link = pmd_link;
1382         data->mac_addrs = &pmd->eth_addr;
1383         /* Set the number of RX and TX queues */
1384         data->nb_rx_queues = 0;
1385         data->nb_tx_queues = 0;
1386
1387         dev->data = data;
1388         dev->dev_ops = &ops;
1389         dev->rx_pkt_burst = pmd_rx_burst;
1390         dev->tx_pkt_burst = pmd_tx_burst;
1391
1392         pmd->intr_handle.type = RTE_INTR_HANDLE_EXT;
1393         pmd->intr_handle.fd = -1;
1394         dev->intr_handle = &pmd->intr_handle;
1395
1396         /* Presetup the fds to -1 as being not valid */
1397         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1398                 pmd->rxq[i].fd = -1;
1399                 pmd->txq[i].fd = -1;
1400         }
1401
1402         if (fixed_mac_type) {
1403                 /* fixed mac = 00:64:74:61:70:<iface_idx> */
1404                 static int iface_idx;
1405                 char mac[ETHER_ADDR_LEN] = "\0dtap";
1406
1407                 mac[ETHER_ADDR_LEN - 1] = iface_idx++;
1408                 rte_memcpy(&pmd->eth_addr, mac, ETHER_ADDR_LEN);
1409         } else {
1410                 eth_random_addr((uint8_t *)&pmd->eth_addr);
1411         }
1412
1413         /* Immediately create the netdevice (this will create the 1st queue). */
1414         /* rx queue */
1415         if (tap_setup_queue(dev, pmd, 0, 1) == -1)
1416                 goto error_exit;
1417         /* tx queue */
1418         if (tap_setup_queue(dev, pmd, 0, 0) == -1)
1419                 goto error_exit;
1420
1421         ifr.ifr_mtu = dev->data->mtu;
1422         if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE) < 0)
1423                 goto error_exit;
1424
1425         memset(&ifr, 0, sizeof(struct ifreq));
1426         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
1427         rte_memcpy(ifr.ifr_hwaddr.sa_data, &pmd->eth_addr, ETHER_ADDR_LEN);
1428         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
1429                 goto error_exit;
1430
1431         /*
1432          * Set up everything related to rte_flow:
1433          * - netlink socket
1434          * - tap / remote if_index
1435          * - mandatory QDISCs
1436          * - rte_flow actual/implicit lists
1437          * - implicit rules
1438          */
1439         pmd->nlsk_fd = tap_nl_init(0);
1440         if (pmd->nlsk_fd == -1) {
1441                 RTE_LOG(WARNING, PMD, "%s: failed to create netlink socket.\n",
1442                         pmd->name);
1443                 goto disable_rte_flow;
1444         }
1445         pmd->if_index = if_nametoindex(pmd->name);
1446         if (!pmd->if_index) {
1447                 RTE_LOG(ERR, PMD, "%s: failed to get if_index.\n", pmd->name);
1448                 goto disable_rte_flow;
1449         }
1450         if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) {
1451                 RTE_LOG(ERR, PMD, "%s: failed to create multiq qdisc.\n",
1452                         pmd->name);
1453                 goto disable_rte_flow;
1454         }
1455         if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) {
1456                 RTE_LOG(ERR, PMD, "%s: failed to create ingress qdisc.\n",
1457                         pmd->name);
1458                 goto disable_rte_flow;
1459         }
1460         LIST_INIT(&pmd->flows);
1461
1462         if (strlen(remote_iface)) {
1463                 pmd->remote_if_index = if_nametoindex(remote_iface);
1464                 if (!pmd->remote_if_index) {
1465                         RTE_LOG(ERR, PMD, "%s: failed to get %s if_index.\n",
1466                                 pmd->name, remote_iface);
1467                         goto error_remote;
1468                 }
1469                 snprintf(pmd->remote_iface, RTE_ETH_NAME_MAX_LEN,
1470                          "%s", remote_iface);
1471
1472                 /* Save state of remote device */
1473                 tap_ioctl(pmd, SIOCGIFFLAGS, &pmd->remote_initial_flags, 0, REMOTE_ONLY);
1474
1475                 /* Replicate remote MAC address */
1476                 if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0) {
1477                         RTE_LOG(ERR, PMD, "%s: failed to get %s MAC address.\n",
1478                                 pmd->name, pmd->remote_iface);
1479                         goto error_remote;
1480                 }
1481                 rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data,
1482                            ETHER_ADDR_LEN);
1483                 /* The desired MAC is already in ifreq after SIOCGIFHWADDR. */
1484                 if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0) {
1485                         RTE_LOG(ERR, PMD, "%s: failed to get %s MAC address.\n",
1486                                 pmd->name, remote_iface);
1487                         goto error_remote;
1488                 }
1489
1490                 /*
1491                  * Flush usually returns negative value because it tries to
1492                  * delete every QDISC (and on a running device, one QDISC at
1493                  * least is needed). Ignore negative return value.
1494                  */
1495                 qdisc_flush(pmd->nlsk_fd, pmd->remote_if_index);
1496                 if (qdisc_create_ingress(pmd->nlsk_fd,
1497                                          pmd->remote_if_index) < 0) {
1498                         RTE_LOG(ERR, PMD, "%s: failed to create ingress qdisc.\n",
1499                                 pmd->remote_iface);
1500                         goto error_remote;
1501                 }
1502                 LIST_INIT(&pmd->implicit_flows);
1503                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_TX) < 0 ||
1504                     tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0 ||
1505                     tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCAST) < 0 ||
1506                     tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCASTV6) < 0) {
1507                         RTE_LOG(ERR, PMD,
1508                                 "%s: failed to create implicit rules.\n",
1509                                 pmd->name);
1510                         goto error_remote;
1511                 }
1512         }
1513
1514         return 0;
1515
1516 disable_rte_flow:
1517         RTE_LOG(ERR, PMD, " Disabling rte flow support: %s(%d)\n",
1518                 strerror(errno), errno);
1519         if (strlen(remote_iface)) {
1520                 RTE_LOG(ERR, PMD, "Remote feature requires flow support.\n");
1521                 goto error_exit;
1522         }
1523         return 0;
1524
1525 error_remote:
1526         RTE_LOG(ERR, PMD, " Can't set up remote feature: %s(%d)\n",
1527                 strerror(errno), errno);
1528         tap_flow_implicit_flush(pmd, NULL);
1529
1530 error_exit:
1531         if (pmd->ioctl_sock > 0)
1532                 close(pmd->ioctl_sock);
1533         rte_eth_dev_release_port(dev);
1534
1535 error_exit_nodev:
1536         RTE_LOG(ERR, PMD, "TAP Unable to initialize %s\n",
1537                 rte_vdev_device_name(vdev));
1538
1539         rte_free(data);
1540         return -EINVAL;
1541 }
1542
1543 static int
1544 set_interface_name(const char *key __rte_unused,
1545                    const char *value,
1546                    void *extra_args)
1547 {
1548         char *name = (char *)extra_args;
1549
1550         if (value)
1551                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
1552         else
1553                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
1554                          DEFAULT_TAP_NAME, (tap_unit - 1));
1555
1556         return 0;
1557 }
1558
1559 static int
1560 set_remote_iface(const char *key __rte_unused,
1561                  const char *value,
1562                  void *extra_args)
1563 {
1564         char *name = (char *)extra_args;
1565
1566         if (value)
1567                 snprintf(name, RTE_ETH_NAME_MAX_LEN, "%s", value);
1568
1569         return 0;
1570 }
1571
1572 static int
1573 set_mac_type(const char *key __rte_unused,
1574              const char *value,
1575              void *extra_args)
1576 {
1577         if (value &&
1578             !strncasecmp(ETH_TAP_MAC_FIXED, value, strlen(ETH_TAP_MAC_FIXED)))
1579                 *(int *)extra_args = 1;
1580         return 0;
1581 }
1582
1583 /* Open a TAP interface device.
1584  */
1585 static int
1586 rte_pmd_tap_probe(struct rte_vdev_device *dev)
1587 {
1588         const char *name, *params;
1589         int ret;
1590         struct rte_kvargs *kvlist = NULL;
1591         int speed;
1592         char tap_name[RTE_ETH_NAME_MAX_LEN];
1593         char remote_iface[RTE_ETH_NAME_MAX_LEN];
1594         int fixed_mac_type = 0;
1595
1596         name = rte_vdev_device_name(dev);
1597         params = rte_vdev_device_args(dev);
1598
1599         speed = ETH_SPEED_NUM_10G;
1600         snprintf(tap_name, sizeof(tap_name), "%s%d",
1601                  DEFAULT_TAP_NAME, tap_unit++);
1602         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
1603
1604         if (params && (params[0] != '\0')) {
1605                 RTE_LOG(DEBUG, PMD, "parameters (%s)\n", params);
1606
1607                 kvlist = rte_kvargs_parse(params, valid_arguments);
1608                 if (kvlist) {
1609                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
1610                                 ret = rte_kvargs_process(kvlist,
1611                                                          ETH_TAP_IFACE_ARG,
1612                                                          &set_interface_name,
1613                                                          tap_name);
1614                                 if (ret == -1)
1615                                         goto leave;
1616                         }
1617
1618                         if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) {
1619                                 ret = rte_kvargs_process(kvlist,
1620                                                          ETH_TAP_REMOTE_ARG,
1621                                                          &set_remote_iface,
1622                                                          remote_iface);
1623                                 if (ret == -1)
1624                                         goto leave;
1625                         }
1626
1627                         if (rte_kvargs_count(kvlist, ETH_TAP_MAC_ARG) == 1) {
1628                                 ret = rte_kvargs_process(kvlist,
1629                                                          ETH_TAP_MAC_ARG,
1630                                                          &set_mac_type,
1631                                                          &fixed_mac_type);
1632                                 if (ret == -1)
1633                                         goto leave;
1634                         }
1635                 }
1636         }
1637         pmd_link.link_speed = speed;
1638
1639         RTE_LOG(NOTICE, PMD, "Initializing pmd_tap for %s as %s\n",
1640                 name, tap_name);
1641
1642         ret = eth_dev_tap_create(dev, tap_name, remote_iface, fixed_mac_type);
1643
1644 leave:
1645         if (ret == -1) {
1646                 RTE_LOG(ERR, PMD, "Failed to create pmd for %s as %s\n",
1647                         name, tap_name);
1648                 tap_unit--;             /* Restore the unit number */
1649         }
1650         rte_kvargs_free(kvlist);
1651
1652         return ret;
1653 }
1654
1655 /* detach a TAP device.
1656  */
1657 static int
1658 rte_pmd_tap_remove(struct rte_vdev_device *dev)
1659 {
1660         struct rte_eth_dev *eth_dev = NULL;
1661         struct pmd_internals *internals;
1662         int i;
1663
1664         RTE_LOG(DEBUG, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
1665                 rte_socket_id());
1666
1667         /* find the ethdev entry */
1668         eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
1669         if (!eth_dev)
1670                 return 0;
1671
1672         internals = eth_dev->data->dev_private;
1673         if (internals->nlsk_fd) {
1674                 tap_flow_flush(eth_dev, NULL);
1675                 tap_flow_implicit_flush(internals, NULL);
1676                 tap_nl_final(internals->nlsk_fd);
1677         }
1678         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1679                 if (internals->rxq[i].fd != -1) {
1680                         close(internals->rxq[i].fd);
1681                         internals->rxq[i].fd = -1;
1682                 }
1683                 if (internals->txq[i].fd != -1) {
1684                         close(internals->txq[i].fd);
1685                         internals->txq[i].fd = -1;
1686                 }
1687         }
1688
1689         close(internals->ioctl_sock);
1690         rte_free(eth_dev->data->dev_private);
1691         rte_free(eth_dev->data);
1692
1693         rte_eth_dev_release_port(eth_dev);
1694
1695         return 0;
1696 }
1697
1698 static struct rte_vdev_driver pmd_tap_drv = {
1699         .probe = rte_pmd_tap_probe,
1700         .remove = rte_pmd_tap_remove,
1701 };
1702 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
1703 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
1704 RTE_PMD_REGISTER_PARAM_STRING(net_tap,
1705                               ETH_TAP_IFACE_ARG "=<string> "
1706                               ETH_TAP_MAC_ARG "=" ETH_TAP_MAC_FIXED " "
1707                               ETH_TAP_REMOTE_ARG "=<string>");