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_ethdev_vdev.h>
  40 #include <rte_malloc.h>
  41 #include <rte_vdev.h>
  42 #include <rte_kvargs.h>
  43 #include <rte_net.h>
  44
  45 #include <sys/types.h>
  46 #include <sys/stat.h>
  47 #include <sys/socket.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/utsname.h>
  50 #include <sys/mman.h>
  51 #include <errno.h>
  52 #include <signal.h>
  53 #include <stdint.h>
  54 #include <sys/uio.h>
  55 #include <unistd.h>
  56 #include <arpa/inet.h>
  57 #include <net/if.h>
  58 #include <linux/if_tun.h>
  59 #include <linux/if_ether.h>
  60 #include <linux/version.h>
  61 #include <fcntl.h>
  62
  63 #include <rte_eth_tap.h>
  64 #include <tap_flow.h>
  65 #include <tap_netlink.h>
  66 #include <tap_tcmsgs.h>
  67
  68 /* Linux based path to the TUN device */
  69 #define TUN_TAP_DEV_PATH        "/dev/net/tun"
  70 #define DEFAULT_TAP_NAME        "dtap"
  71
  72 #define ETH_TAP_IFACE_ARG       "iface"
  73 #define ETH_TAP_SPEED_ARG       "speed"
  74 #define ETH_TAP_REMOTE_ARG      "remote"
  75
  76 #define FLOWER_KERNEL_VERSION KERNEL_VERSION(4, 2, 0)
  77 #define FLOWER_VLAN_KERNEL_VERSION KERNEL_VERSION(4, 9, 0)
  78
  79 static struct rte_vdev_driver pmd_tap_drv;
  80
  81 static const char *valid_arguments[] = {
  82         ETH_TAP_IFACE_ARG,
  83         ETH_TAP_SPEED_ARG,
  84         ETH_TAP_REMOTE_ARG,
  85         NULL
  86 };
  87
  88 static int tap_unit;
  89
  90 static volatile uint32_t tap_trigger;   /* Rx trigger */
  91
  92 static struct rte_eth_link pmd_link = {
  93         .link_speed = ETH_SPEED_NUM_10G,
  94         .link_duplex = ETH_LINK_FULL_DUPLEX,
  95         .link_status = ETH_LINK_DOWN,
  96         .link_autoneg = ETH_LINK_SPEED_AUTONEG
  97 };
  98
  99 static void
 100 tap_trigger_cb(int sig __rte_unused)
 101 {
 102         /* Valid trigger values are nonzero */
 103         tap_trigger = (tap_trigger + 1) | 0x80000000;
 104 }
 105
 106 /* Specifies on what netdevices the ioctl should be applied */
 107 enum ioctl_mode {
 108         LOCAL_AND_REMOTE,
 109         LOCAL_ONLY,
 110         REMOTE_ONLY,
 111 };
 112
 113 static int
 114 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 115           struct ifreq *ifr, int set, enum ioctl_mode mode);
 116
 117 static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
 118
 119 /* Tun/Tap allocation routine
 120  *
 121  * name is the number of the interface to use, unless NULL to take the host
 122  * supplied name.
 123  */
 124 static int
 125 tun_alloc(struct pmd_internals *pmd, uint16_t qid)
 126 {
 127         struct ifreq ifr;
 128 #ifdef IFF_MULTI_QUEUE
 129         unsigned int features;
 130 #endif
 131         int fd;
 132
 133         memset(&ifr, 0, sizeof(struct ifreq));
 134
 135         /*
 136          * Do not set IFF_NO_PI as packet information header will be needed
 137          * to check if a received packet has been truncated.
 138          */
 139         ifr.ifr_flags = IFF_TAP;
 140         snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
 141
 142         RTE_LOG(DEBUG, PMD, "ifr_name '%s'\n", ifr.ifr_name);
 143
 144         fd = open(TUN_TAP_DEV_PATH, O_RDWR);
 145         if (fd < 0) {
 146                 RTE_LOG(ERR, PMD, "Unable to create TAP interface");
 147                 goto error;
 148         }
 149
 150 #ifdef IFF_MULTI_QUEUE
 151         /* Grab the TUN features to verify we can work multi-queue */
 152         if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
 153                 RTE_LOG(ERR, PMD, "TAP unable to get TUN/TAP features\n");
 154                 goto error;
 155         }
 156         RTE_LOG(DEBUG, PMD, "  TAP Features %08x\n", features);
 157
 158         if (features & IFF_MULTI_QUEUE) {
 159                 RTE_LOG(DEBUG, PMD, "  Multi-queue support for %d queues\n",
 160                         RTE_PMD_TAP_MAX_QUEUES);
 161                 ifr.ifr_flags |= IFF_MULTI_QUEUE;
 162         } else
 163 #endif
 164         {
 165                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 166                 RTE_LOG(DEBUG, PMD, "  Single queue only support\n");
 167         }
 168
 169         /* Set the TUN/TAP configuration and set the name if needed */
 170         if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
 171                 RTE_LOG(WARNING, PMD,
 172                         "Unable to set TUNSETIFF for %s\n",
 173                         ifr.ifr_name);
 174                 perror("TUNSETIFF");
 175                 goto error;
 176         }
 177
 178         /* Always set the file descriptor to non-blocking */
 179         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
 180                 RTE_LOG(WARNING, PMD,
 181                         "Unable to set %s to nonblocking\n",
 182                         ifr.ifr_name);
 183                 perror("F_SETFL, NONBLOCK");
 184                 goto error;
 185         }
 186
 187         /* Set up trigger to optimize empty Rx bursts */
 188         errno = 0;
 189         do {
 190                 struct sigaction sa;
 191                 int flags = fcntl(fd, F_GETFL);
 192
 193                 if (flags == -1 || sigaction(SIGIO, NULL, &sa) == -1)
 194                         break;
 195                 if (sa.sa_handler != tap_trigger_cb) {
 196                         /*
 197                          * Make sure SIGIO is not already taken. This is done
 198                          * as late as possible to leave the application a
 199                          * chance to set up its own signal handler first.
 200                          */
 201                         if (sa.sa_handler != SIG_IGN &&
 202                             sa.sa_handler != SIG_DFL) {
 203                                 errno = EBUSY;
 204                                 break;
 205                         }
 206                         sa = (struct sigaction){
 207                                 .sa_flags = SA_RESTART,
 208                                 .sa_handler = tap_trigger_cb,
 209                         };
 210                         if (sigaction(SIGIO, &sa, NULL) == -1)
 211                                 break;
 212                 }
 213                 /* Enable SIGIO on file descriptor */
 214                 fcntl(fd, F_SETFL, flags | O_ASYNC);
 215                 fcntl(fd, F_SETOWN, getpid());
 216         } while (0);
 217         if (errno) {
 218                 /* Disable trigger globally in case of error */
 219                 tap_trigger = 0;
 220                 RTE_LOG(WARNING, PMD, "Rx trigger disabled: %s\n",
 221                         strerror(errno));
 222         }
 223
 224         if (qid == 0) {
 225                 struct ifreq ifr;
 226
 227                 /*
 228                  * pmd->eth_addr contains the desired MAC, either from remote
 229                  * or from a random assignment. Sync it with the tap netdevice.
 230                  */
 231                 ifr.ifr_hwaddr.sa_family = AF_LOCAL;
 232                 rte_memcpy(ifr.ifr_hwaddr.sa_data, &pmd->eth_addr,
 233                            ETHER_ADDR_LEN);
 234                 if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
 235                         goto error;
 236
 237                 pmd->if_index = if_nametoindex(pmd->name);
 238                 if (!pmd->if_index) {
 239                         RTE_LOG(ERR, PMD,
 240                                 "Could not find ifindex for %s: rte_flow won't be usable.\n",
 241                                 pmd->name);
 242                         return fd;
 243                 }
 244                 if (!pmd->flower_support)
 245                         return fd;
 246                 if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) {
 247                         RTE_LOG(ERR, PMD,
 248                                 "Could not create multiq qdisc for %s: rte_flow won't be usable.\n",
 249                                 pmd->name);
 250                         return fd;
 251                 }
 252                 if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) {
 253                         RTE_LOG(ERR, PMD,
 254                                 "Could not create multiq qdisc for %s: rte_flow won't be usable.\n",
 255                                 pmd->name);
 256                         return fd;
 257                 }
 258                 if (pmd->remote_if_index) {
 259                         /*
 260                          * Flush usually returns negative value because it tries
 261                          * to delete every QDISC (and on a running device, one
 262                          * QDISC at least is needed). Ignore negative return
 263                          * value.
 264                          */
 265                         qdisc_flush(pmd->nlsk_fd, pmd->remote_if_index);
 266                         if (qdisc_create_ingress(pmd->nlsk_fd,
 267                                                  pmd->remote_if_index) < 0)
 268                                 goto remote_fail;
 269                         LIST_INIT(&pmd->implicit_flows);
 270                         if (tap_flow_implicit_create(
 271                                     pmd, TAP_REMOTE_LOCAL_MAC) < 0)
 272                                 goto remote_fail;
 273                         if (tap_flow_implicit_create(
 274                                     pmd, TAP_REMOTE_BROADCAST) < 0)
 275                                 goto remote_fail;
 276                         if (tap_flow_implicit_create(
 277                                     pmd, TAP_REMOTE_BROADCASTV6) < 0)
 278                                 goto remote_fail;
 279                         if (tap_flow_implicit_create(
 280                                     pmd, TAP_REMOTE_TX) < 0)
 281                                 goto remote_fail;
 282                 }
 283         }
 284
 285         return fd;
 286
 287 remote_fail:
 288         RTE_LOG(ERR, PMD,
 289                 "Could not set up remote flow rules for %s: remote disabled.\n",
 290                 pmd->name);
 291         pmd->remote_if_index = 0;
 292         tap_flow_implicit_flush(pmd, NULL);
 293         return fd;
 294
 295 error:
 296         if (fd > 0)
 297                 close(fd);
 298         return -1;
 299 }
 300
 301 /* Callback to handle the rx burst of packets to the correct interface and
 302  * file descriptor(s) in a multi-queue setup.
 303  */
 304 static uint16_t
 305 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 306 {
 307         struct rx_queue *rxq = queue;
 308         uint16_t num_rx;
 309         unsigned long num_rx_bytes = 0;
 310         uint32_t trigger = tap_trigger;
 311
 312         if (trigger == rxq->trigger_seen)
 313                 return 0;
 314         if (trigger)
 315                 rxq->trigger_seen = trigger;
 316         rte_compiler_barrier();
 317         for (num_rx = 0; num_rx < nb_pkts; ) {
 318                 struct rte_mbuf *mbuf = rxq->pool;
 319                 struct rte_mbuf *seg = NULL;
 320                 struct rte_mbuf *new_tail = NULL;
 321                 uint16_t data_off = rte_pktmbuf_headroom(mbuf);
 322                 int len;
 323
 324                 len = readv(rxq->fd, *rxq->iovecs,
 325                             1 + (rxq->rxmode->enable_scatter ?
 326                                  rxq->nb_rx_desc : 1));
 327                 if (len < (int)sizeof(struct tun_pi))
 328                         break;
 329
 330                 /* Packet couldn't fit in the provided mbuf */
 331                 if (unlikely(rxq->pi.flags & TUN_PKT_STRIP)) {
 332                         rxq->stats.ierrors++;
 333                         continue;
 334                 }
 335
 336                 len -= sizeof(struct tun_pi);
 337
 338                 mbuf->pkt_len = len;
 339                 mbuf->port = rxq->in_port;
 340                 while (1) {
 341                         struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp);
 342
 343                         if (unlikely(!buf)) {
 344                                 rxq->stats.rx_nombuf++;
 345                                 /* No new buf has been allocated: do nothing */
 346                                 if (!new_tail || !seg)
 347                                         goto end;
 348
 349                                 seg->next = NULL;
 350                                 rte_pktmbuf_free(mbuf);
 351
 352                                 goto end;
 353                         }
 354                         seg = seg ? seg->next : mbuf;
 355                         if (rxq->pool == mbuf)
 356                                 rxq->pool = buf;
 357                         if (new_tail)
 358                                 new_tail->next = buf;
 359                         new_tail = buf;
 360                         new_tail->next = seg->next;
 361
 362                         /* iovecs[0] is reserved for packet info (pi) */
 363                         (*rxq->iovecs)[mbuf->nb_segs].iov_len =
 364                                 buf->buf_len - data_off;
 365                         (*rxq->iovecs)[mbuf->nb_segs].iov_base =
 366                                 (char *)buf->buf_addr + data_off;
 367
 368                         seg->data_len = RTE_MIN(seg->buf_len - data_off, len);
 369                         seg->data_off = data_off;
 370
 371                         len -= seg->data_len;
 372                         if (len <= 0)
 373                                 break;
 374                         mbuf->nb_segs++;
 375                         /* First segment has headroom, not the others */
 376                         data_off = 0;
 377                 }
 378                 seg->next = NULL;
 379                 mbuf->packet_type = rte_net_get_ptype(mbuf, NULL,
 380                                                       RTE_PTYPE_ALL_MASK);
 381
 382                 /* account for the receive frame */
 383                 bufs[num_rx++] = mbuf;
 384                 num_rx_bytes += mbuf->pkt_len;
 385         }
 386 end:
 387         rxq->stats.ipackets += num_rx;
 388         rxq->stats.ibytes += num_rx_bytes;
 389
 390         return num_rx;
 391 }
 392
 393 /* Callback to handle sending packets from the tap interface
 394  */
 395 static uint16_t
 396 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 397 {
 398         struct tx_queue *txq = queue;
 399         uint16_t num_tx = 0;
 400         unsigned long num_tx_bytes = 0;
 401         uint32_t max_size;
 402         int i;
 403
 404         if (unlikely(nb_pkts == 0))
 405                 return 0;
 406
 407         max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4);
 408         for (i = 0; i < nb_pkts; i++) {
 409                 struct rte_mbuf *mbuf = bufs[num_tx];
 410                 struct iovec iovecs[mbuf->nb_segs + 1];
 411                 struct tun_pi pi = { .flags = 0 };
 412                 struct rte_mbuf *seg = mbuf;
 413                 int n;
 414                 int j;
 415
 416                 /* stats.errs will be incremented */
 417                 if (rte_pktmbuf_pkt_len(mbuf) > max_size)
 418                         break;
 419
 420                 iovecs[0].iov_base = &pi;
 421                 iovecs[0].iov_len = sizeof(pi);
 422                 for (j = 1; j <= mbuf->nb_segs; j++) {
 423                         iovecs[j].iov_len = rte_pktmbuf_data_len(seg);
 424                         iovecs[j].iov_base =
 425                                 rte_pktmbuf_mtod(seg, void *);
 426                         seg = seg->next;
 427                 }
 428                 /* copy the tx frame data */
 429                 n = writev(txq->fd, iovecs, mbuf->nb_segs + 1);
 430                 if (n <= 0)
 431                         break;
 432
 433                 num_tx++;
 434                 num_tx_bytes += mbuf->pkt_len;
 435                 rte_pktmbuf_free(mbuf);
 436         }
 437
 438         txq->stats.opackets += num_tx;
 439         txq->stats.errs += nb_pkts - num_tx;
 440         txq->stats.obytes += num_tx_bytes;
 441
 442         return num_tx;
 443 }
 444
 445 static int
 446 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 447           struct ifreq *ifr, int set, enum ioctl_mode mode)
 448 {
 449         short req_flags = ifr->ifr_flags;
 450         int remote = pmd->remote_if_index &&
 451                 (mode == REMOTE_ONLY || mode == LOCAL_AND_REMOTE);
 452
 453         if (!pmd->remote_if_index && mode == REMOTE_ONLY)
 454                 return 0;
 455         /*
 456          * If there is a remote netdevice, apply ioctl on it, then apply it on
 457          * the tap netdevice.
 458          */
 459 apply:
 460         if (remote)
 461                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->remote_iface);
 462         else if (mode == LOCAL_ONLY || mode == LOCAL_AND_REMOTE)
 463                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->name);
 464         switch (request) {
 465         case SIOCSIFFLAGS:
 466                 /* fetch current flags to leave other flags untouched */
 467                 if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
 468                         goto error;
 469                 if (set)
 470                         ifr->ifr_flags |= req_flags;
 471                 else
 472                         ifr->ifr_flags &= ~req_flags;
 473                 break;
 474         case SIOCGIFFLAGS:
 475         case SIOCGIFHWADDR:
 476         case SIOCSIFHWADDR:
 477         case SIOCSIFMTU:
 478                 break;
 479         default:
 480                 RTE_LOG(WARNING, PMD, "%s: ioctl() called with wrong arg\n",
 481                         pmd->name);
 482                 return -EINVAL;
 483         }
 484         if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
 485                 goto error;
 486         if (remote-- && mode == LOCAL_AND_REMOTE)
 487                 goto apply;
 488         return 0;
 489
 490 error:
 491         RTE_LOG(ERR, PMD, "%s: ioctl(%lu) failed with error: %s\n",
 492                 ifr->ifr_name, request, strerror(errno));
 493         return -errno;
 494 }
 495
 496 static int
 497 tap_link_set_down(struct rte_eth_dev *dev)
 498 {
 499         struct pmd_internals *pmd = dev->data->dev_private;
 500         struct ifreq ifr = { .ifr_flags = IFF_UP };
 501
 502         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 503         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 504 }
 505
 506 static int
 507 tap_link_set_up(struct rte_eth_dev *dev)
 508 {
 509         struct pmd_internals *pmd = dev->data->dev_private;
 510         struct ifreq ifr = { .ifr_flags = IFF_UP };
 511
 512         dev->data->dev_link.link_status = ETH_LINK_UP;
 513         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 514 }
 515
 516 static int
 517 tap_dev_start(struct rte_eth_dev *dev)
 518 {
 519         int err;
 520
 521         err = tap_intr_handle_set(dev, 1);
 522         if (err)
 523                 return err;
 524         return tap_link_set_up(dev);
 525 }
 526
 527 /* This function gets called when the current port gets stopped.
 528  */
 529 static void
 530 tap_dev_stop(struct rte_eth_dev *dev)
 531 {
 532         tap_intr_handle_set(dev, 0);
 533         tap_link_set_down(dev);
 534 }
 535
 536 static int
 537 tap_dev_configure(struct rte_eth_dev *dev __rte_unused)
 538 {
 539         return 0;
 540 }
 541
 542 static uint32_t
 543 tap_dev_speed_capa(void)
 544 {
 545         uint32_t speed = pmd_link.link_speed;
 546         uint32_t capa = 0;
 547
 548         if (speed >= ETH_SPEED_NUM_10M)
 549                 capa |= ETH_LINK_SPEED_10M;
 550         if (speed >= ETH_SPEED_NUM_100M)
 551                 capa |= ETH_LINK_SPEED_100M;
 552         if (speed >= ETH_SPEED_NUM_1G)
 553                 capa |= ETH_LINK_SPEED_1G;
 554         if (speed >= ETH_SPEED_NUM_5G)
 555                 capa |= ETH_LINK_SPEED_2_5G;
 556         if (speed >= ETH_SPEED_NUM_5G)
 557                 capa |= ETH_LINK_SPEED_5G;
 558         if (speed >= ETH_SPEED_NUM_10G)
 559                 capa |= ETH_LINK_SPEED_10G;
 560         if (speed >= ETH_SPEED_NUM_20G)
 561                 capa |= ETH_LINK_SPEED_20G;
 562         if (speed >= ETH_SPEED_NUM_25G)
 563                 capa |= ETH_LINK_SPEED_25G;
 564         if (speed >= ETH_SPEED_NUM_40G)
 565                 capa |= ETH_LINK_SPEED_40G;
 566         if (speed >= ETH_SPEED_NUM_50G)
 567                 capa |= ETH_LINK_SPEED_50G;
 568         if (speed >= ETH_SPEED_NUM_56G)
 569                 capa |= ETH_LINK_SPEED_56G;
 570         if (speed >= ETH_SPEED_NUM_100G)
 571                 capa |= ETH_LINK_SPEED_100G;
 572
 573         return capa;
 574 }
 575
 576 static void
 577 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 578 {
 579         struct pmd_internals *internals = dev->data->dev_private;
 580
 581         dev_info->if_index = internals->if_index;
 582         dev_info->max_mac_addrs = 1;
 583         dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
 584         dev_info->max_rx_queues = internals->nb_queues;
 585         dev_info->max_tx_queues = internals->nb_queues;
 586         dev_info->min_rx_bufsize = 0;
 587         dev_info->pci_dev = NULL;
 588         dev_info->speed_capa = tap_dev_speed_capa();
 589 }
 590
 591 static void
 592 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
 593 {
 594         unsigned int i, imax;
 595         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 596         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 597         unsigned long rx_nombuf = 0, ierrors = 0;
 598         const struct pmd_internals *pmd = dev->data->dev_private;
 599
 600         imax = (pmd->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 601                 pmd->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 602
 603         for (i = 0; i < imax; i++) {
 604                 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
 605                 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
 606                 rx_total += tap_stats->q_ipackets[i];
 607                 rx_bytes_total += tap_stats->q_ibytes[i];
 608                 rx_nombuf += pmd->rxq[i].stats.rx_nombuf;
 609                 ierrors += pmd->rxq[i].stats.ierrors;
 610
 611                 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
 612                 tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
 613                 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
 614                 tx_total += tap_stats->q_opackets[i];
 615                 tx_err_total += tap_stats->q_errors[i];
 616                 tx_bytes_total += tap_stats->q_obytes[i];
 617         }
 618
 619         tap_stats->ipackets = rx_total;
 620         tap_stats->ibytes = rx_bytes_total;
 621         tap_stats->ierrors = ierrors;
 622         tap_stats->rx_nombuf = rx_nombuf;
 623         tap_stats->opackets = tx_total;
 624         tap_stats->oerrors = tx_err_total;
 625         tap_stats->obytes = tx_bytes_total;
 626 }
 627
 628 static void
 629 tap_stats_reset(struct rte_eth_dev *dev)
 630 {
 631         int i;
 632         struct pmd_internals *pmd = dev->data->dev_private;
 633
 634         for (i = 0; i < pmd->nb_queues; i++) {
 635                 pmd->rxq[i].stats.ipackets = 0;
 636                 pmd->rxq[i].stats.ibytes = 0;
 637                 pmd->rxq[i].stats.ierrors = 0;
 638                 pmd->rxq[i].stats.rx_nombuf = 0;
 639
 640                 pmd->txq[i].stats.opackets = 0;
 641                 pmd->txq[i].stats.errs = 0;
 642                 pmd->txq[i].stats.obytes = 0;
 643         }
 644 }
 645
 646 static void
 647 tap_dev_close(struct rte_eth_dev *dev __rte_unused)
 648 {
 649         int i;
 650         struct pmd_internals *internals = dev->data->dev_private;
 651
 652         tap_link_set_down(dev);
 653         tap_flow_flush(dev, NULL);
 654         tap_flow_implicit_flush(internals, NULL);
 655
 656         for (i = 0; i < internals->nb_queues; i++) {
 657                 if (internals->rxq[i].fd != -1)
 658                         close(internals->rxq[i].fd);
 659                 internals->rxq[i].fd = -1;
 660                 internals->txq[i].fd = -1;
 661         }
 662 }
 663
 664 static void
 665 tap_rx_queue_release(void *queue)
 666 {
 667         struct rx_queue *rxq = queue;
 668
 669         if (rxq && (rxq->fd > 0)) {
 670                 close(rxq->fd);
 671                 rxq->fd = -1;
 672                 rte_pktmbuf_free(rxq->pool);
 673                 rte_free(rxq->iovecs);
 674                 rxq->pool = NULL;
 675                 rxq->iovecs = NULL;
 676         }
 677 }
 678
 679 static void
 680 tap_tx_queue_release(void *queue)
 681 {
 682         struct tx_queue *txq = queue;
 683
 684         if (txq && (txq->fd > 0)) {
 685                 close(txq->fd);
 686                 txq->fd = -1;
 687         }
 688 }
 689
 690 static int
 691 tap_link_update(struct rte_eth_dev *dev, int wait_to_complete __rte_unused)
 692 {
 693         struct rte_eth_link *dev_link = &dev->data->dev_link;
 694         struct pmd_internals *pmd = dev->data->dev_private;
 695         struct ifreq ifr = { .ifr_flags = 0 };
 696
 697         if (pmd->remote_if_index) {
 698                 tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, REMOTE_ONLY);
 699                 if (!(ifr.ifr_flags & IFF_UP) ||
 700                     !(ifr.ifr_flags & IFF_RUNNING)) {
 701                         dev_link->link_status = ETH_LINK_DOWN;
 702                         return 0;
 703                 }
 704         }
 705         tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, LOCAL_ONLY);
 706         dev_link->link_status =
 707                 ((ifr.ifr_flags & IFF_UP) && (ifr.ifr_flags & IFF_RUNNING) ?
 708                  ETH_LINK_UP :
 709                  ETH_LINK_DOWN);
 710         return 0;
 711 }
 712
 713 static void
 714 tap_promisc_enable(struct rte_eth_dev *dev)
 715 {
 716         struct pmd_internals *pmd = dev->data->dev_private;
 717         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 718
 719         dev->data->promiscuous = 1;
 720         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 721         if (pmd->remote_if_index)
 722                 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC);
 723 }
 724
 725 static void
 726 tap_promisc_disable(struct rte_eth_dev *dev)
 727 {
 728         struct pmd_internals *pmd = dev->data->dev_private;
 729         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 730
 731         dev->data->promiscuous = 0;
 732         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 733         if (pmd->remote_if_index)
 734                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC);
 735 }
 736
 737 static void
 738 tap_allmulti_enable(struct rte_eth_dev *dev)
 739 {
 740         struct pmd_internals *pmd = dev->data->dev_private;
 741         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 742
 743         dev->data->all_multicast = 1;
 744         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 745         if (pmd->remote_if_index)
 746                 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI);
 747 }
 748
 749 static void
 750 tap_allmulti_disable(struct rte_eth_dev *dev)
 751 {
 752         struct pmd_internals *pmd = dev->data->dev_private;
 753         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 754
 755         dev->data->all_multicast = 0;
 756         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 757         if (pmd->remote_if_index)
 758                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI);
 759 }
 760
 761
 762 static void
 763 tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
 764 {
 765         struct pmd_internals *pmd = dev->data->dev_private;
 766         struct ifreq ifr;
 767
 768         if (is_zero_ether_addr(mac_addr)) {
 769                 RTE_LOG(ERR, PMD, "%s: can't set an empty MAC address\n",
 770                         dev->data->name);
 771                 return;
 772         }
 773         /* Check the actual current MAC address on the tap netdevice */
 774         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, LOCAL_ONLY) != 0) {
 775                 RTE_LOG(ERR, PMD,
 776                         "%s: couldn't check current tap MAC address\n",
 777                         dev->data->name);
 778                 return;
 779         }
 780         if (is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 781                                mac_addr))
 782                 return;
 783
 784         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
 785         rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETHER_ADDR_LEN);
 786         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1, LOCAL_AND_REMOTE) < 0)
 787                 return;
 788         rte_memcpy(&pmd->eth_addr, mac_addr, ETHER_ADDR_LEN);
 789         if (pmd->remote_if_index) {
 790                 /* Replace MAC redirection rule after a MAC change */
 791                 if (tap_flow_implicit_destroy(pmd, TAP_REMOTE_LOCAL_MAC) < 0) {
 792                         RTE_LOG(ERR, PMD,
 793                                 "%s: Couldn't delete MAC redirection rule\n",
 794                                 dev->data->name);
 795                         return;
 796                 }
 797                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0)
 798                         RTE_LOG(ERR, PMD,
 799                                 "%s: Couldn't add MAC redirection rule\n",
 800                                 dev->data->name);
 801         }
 802 }
 803
 804 static int
 805 tap_setup_queue(struct rte_eth_dev *dev,
 806                 struct pmd_internals *internals,
 807                 uint16_t qid)
 808 {
 809         struct pmd_internals *pmd = dev->data->dev_private;
 810         struct rx_queue *rx = &internals->rxq[qid];
 811         struct tx_queue *tx = &internals->txq[qid];
 812         int fd;
 813
 814         fd = rx->fd;
 815         if (fd < 0) {
 816                 fd = tx->fd;
 817                 if (fd < 0) {
 818                         RTE_LOG(INFO, PMD, "Add queue to TAP %s for qid %d\n",
 819                                 pmd->name, qid);
 820                         fd = tun_alloc(pmd, qid);
 821                         if (fd < 0) {
 822                                 RTE_LOG(ERR, PMD, "tun_alloc(%s, %d) failed\n",
 823                                         pmd->name, qid);
 824                                 return -1;
 825                         }
 826                         if (qid == 0) {
 827                                 struct ifreq ifr;
 828
 829                                 ifr.ifr_mtu = dev->data->mtu;
 830                                 if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1,
 831                                               LOCAL_AND_REMOTE) < 0) {
 832                                         close(fd);
 833                                         return -1;
 834                                 }
 835                         }
 836                 }
 837         }
 838
 839         rx->fd = fd;
 840         tx->fd = fd;
 841         tx->mtu = &dev->data->mtu;
 842         rx->rxmode = &dev->data->dev_conf.rxmode;
 843
 844         return fd;
 845 }
 846
 847 static int
 848 rx_setup_queue(struct rte_eth_dev *dev,
 849                 struct pmd_internals *internals,
 850                 uint16_t qid)
 851 {
 852         dev->data->rx_queues[qid] = &internals->rxq[qid];
 853
 854         return tap_setup_queue(dev, internals, qid);
 855 }
 856
 857 static int
 858 tx_setup_queue(struct rte_eth_dev *dev,
 859                 struct pmd_internals *internals,
 860                 uint16_t qid)
 861 {
 862         dev->data->tx_queues[qid] = &internals->txq[qid];
 863
 864         return tap_setup_queue(dev, internals, qid);
 865 }
 866
 867 static int
 868 tap_rx_queue_setup(struct rte_eth_dev *dev,
 869                    uint16_t rx_queue_id,
 870                    uint16_t nb_rx_desc,
 871                    unsigned int socket_id,
 872                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 873                    struct rte_mempool *mp)
 874 {
 875         struct pmd_internals *internals = dev->data->dev_private;
 876         struct rx_queue *rxq = &internals->rxq[rx_queue_id];
 877         struct rte_mbuf **tmp = &rxq->pool;
 878         long iov_max = sysconf(_SC_IOV_MAX);
 879         uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
 880         struct iovec (*iovecs)[nb_desc + 1];
 881         int data_off = RTE_PKTMBUF_HEADROOM;
 882         int ret = 0;
 883         int fd;
 884         int i;
 885
 886         if ((rx_queue_id >= internals->nb_queues) || !mp) {
 887                 RTE_LOG(WARNING, PMD,
 888                         "nb_queues %d too small or mempool NULL\n",
 889                         internals->nb_queues);
 890                 return -1;
 891         }
 892
 893         rxq->mp = mp;
 894         rxq->trigger_seen = 1; /* force initial burst */
 895         rxq->in_port = dev->data->port_id;
 896         rxq->nb_rx_desc = nb_desc;
 897         iovecs = rte_zmalloc_socket(dev->data->name, sizeof(*iovecs), 0,
 898                                     socket_id);
 899         if (!iovecs) {
 900                 RTE_LOG(WARNING, PMD,
 901                         "%s: Couldn't allocate %d RX descriptors\n",
 902                         dev->data->name, nb_desc);
 903                 return -ENOMEM;
 904         }
 905         rxq->iovecs = iovecs;
 906
 907         fd = rx_setup_queue(dev, internals, rx_queue_id);
 908         if (fd == -1) {
 909                 ret = fd;
 910                 goto error;
 911         }
 912
 913         (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
 914         (*rxq->iovecs)[0].iov_base = &rxq->pi;
 915
 916         for (i = 1; i <= nb_desc; i++) {
 917                 *tmp = rte_pktmbuf_alloc(rxq->mp);
 918                 if (!*tmp) {
 919                         RTE_LOG(WARNING, PMD,
 920                                 "%s: couldn't allocate memory for queue %d\n",
 921                                 dev->data->name, rx_queue_id);
 922                         ret = -ENOMEM;
 923                         goto error;
 924                 }
 925                 (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off;
 926                 (*rxq->iovecs)[i].iov_base =
 927                         (char *)(*tmp)->buf_addr + data_off;
 928                 data_off = 0;
 929                 tmp = &(*tmp)->next;
 930         }
 931
 932         RTE_LOG(DEBUG, PMD, "  RX TAP device name %s, qid %d on fd %d\n",
 933                 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
 934
 935         return 0;
 936
 937 error:
 938         rte_pktmbuf_free(rxq->pool);
 939         rxq->pool = NULL;
 940         rte_free(rxq->iovecs);
 941         rxq->iovecs = NULL;
 942         return ret;
 943 }
 944
 945 static int
 946 tap_tx_queue_setup(struct rte_eth_dev *dev,
 947                    uint16_t tx_queue_id,
 948                    uint16_t nb_tx_desc __rte_unused,
 949                    unsigned int socket_id __rte_unused,
 950                    const struct rte_eth_txconf *tx_conf __rte_unused)
 951 {
 952         struct pmd_internals *internals = dev->data->dev_private;
 953         int ret;
 954
 955         if (tx_queue_id >= internals->nb_queues)
 956                 return -1;
 957
 958         ret = tx_setup_queue(dev, internals, tx_queue_id);
 959         if (ret == -1)
 960                 return -1;
 961
 962         RTE_LOG(DEBUG, PMD, "  TX TAP device name %s, qid %d on fd %d\n",
 963                 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
 964
 965         return 0;
 966 }
 967
 968 static int
 969 tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 970 {
 971         struct pmd_internals *pmd = dev->data->dev_private;
 972         struct ifreq ifr = { .ifr_mtu = mtu };
 973         int err = 0;
 974
 975         err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE);
 976         if (!err)
 977                 dev->data->mtu = mtu;
 978
 979         return err;
 980 }
 981
 982 static int
 983 tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
 984                      struct ether_addr *mc_addr_set __rte_unused,
 985                      uint32_t nb_mc_addr __rte_unused)
 986 {
 987         /*
 988          * Nothing to do actually: the tap has no filtering whatsoever, every
 989          * packet is received.
 990          */
 991         return 0;
 992 }
 993
 994 static int
 995 tap_nl_msg_handler(struct nlmsghdr *nh, void *arg)
 996 {
 997         struct rte_eth_dev *dev = arg;
 998         struct pmd_internals *pmd = dev->data->dev_private;
 999         struct ifinfomsg *info = NLMSG_DATA(nh);
1000
1001         if (nh->nlmsg_type != RTM_NEWLINK ||
1002             (info->ifi_index != pmd->if_index &&
1003              info->ifi_index != pmd->remote_if_index))
1004                 return 0;
1005         return tap_link_update(dev, 0);
1006 }
1007
1008 static void
1009 tap_dev_intr_handler(void *cb_arg)
1010 {
1011         struct rte_eth_dev *dev = cb_arg;
1012         struct pmd_internals *pmd = dev->data->dev_private;
1013
1014         nl_recv(pmd->intr_handle.fd, tap_nl_msg_handler, dev);
1015 }
1016
1017 static int
1018 tap_intr_handle_set(struct rte_eth_dev *dev, int set)
1019 {
1020         struct pmd_internals *pmd = dev->data->dev_private;
1021
1022         /* In any case, disable interrupt if the conf is no longer there. */
1023         if (!dev->data->dev_conf.intr_conf.lsc) {
1024                 if (pmd->intr_handle.fd != -1)
1025                         nl_final(pmd->intr_handle.fd);
1026                 rte_intr_callback_unregister(
1027                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1028                 return 0;
1029         }
1030         if (set) {
1031                 pmd->intr_handle.fd = nl_init(RTMGRP_LINK);
1032                 if (unlikely(pmd->intr_handle.fd == -1))
1033                         return -EBADF;
1034                 return rte_intr_callback_register(
1035                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1036         }
1037         nl_final(pmd->intr_handle.fd);
1038         return rte_intr_callback_unregister(&pmd->intr_handle,
1039                                             tap_dev_intr_handler, dev);
1040 }
1041
1042 static const uint32_t*
1043 tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused)
1044 {
1045         static const uint32_t ptypes[] = {
1046                 RTE_PTYPE_INNER_L2_ETHER,
1047                 RTE_PTYPE_INNER_L2_ETHER_VLAN,
1048                 RTE_PTYPE_INNER_L2_ETHER_QINQ,
1049                 RTE_PTYPE_INNER_L3_IPV4,
1050                 RTE_PTYPE_INNER_L3_IPV4_EXT,
1051                 RTE_PTYPE_INNER_L3_IPV6,
1052                 RTE_PTYPE_INNER_L3_IPV6_EXT,
1053                 RTE_PTYPE_INNER_L4_FRAG,
1054                 RTE_PTYPE_INNER_L4_UDP,
1055                 RTE_PTYPE_INNER_L4_TCP,
1056                 RTE_PTYPE_INNER_L4_SCTP,
1057                 RTE_PTYPE_L2_ETHER,
1058                 RTE_PTYPE_L2_ETHER_VLAN,
1059                 RTE_PTYPE_L2_ETHER_QINQ,
1060                 RTE_PTYPE_L3_IPV4,
1061                 RTE_PTYPE_L3_IPV4_EXT,
1062                 RTE_PTYPE_L3_IPV6_EXT,
1063                 RTE_PTYPE_L3_IPV6,
1064                 RTE_PTYPE_L4_FRAG,
1065                 RTE_PTYPE_L4_UDP,
1066                 RTE_PTYPE_L4_TCP,
1067                 RTE_PTYPE_L4_SCTP,
1068         };
1069
1070         return ptypes;
1071 }
1072
1073 static int
1074 tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused,
1075                   struct rte_eth_fc_conf *fc_conf)
1076 {
1077         fc_conf->mode = RTE_FC_NONE;
1078         return 0;
1079 }
1080
1081 static int
1082 tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused,
1083                   struct rte_eth_fc_conf *fc_conf)
1084 {
1085         if (fc_conf->mode != RTE_FC_NONE)
1086                 return -ENOTSUP;
1087         return 0;
1088 }
1089
1090 static const struct eth_dev_ops ops = {
1091         .dev_start              = tap_dev_start,
1092         .dev_stop               = tap_dev_stop,
1093         .dev_close              = tap_dev_close,
1094         .dev_configure          = tap_dev_configure,
1095         .dev_infos_get          = tap_dev_info,
1096         .rx_queue_setup         = tap_rx_queue_setup,
1097         .tx_queue_setup         = tap_tx_queue_setup,
1098         .rx_queue_release       = tap_rx_queue_release,
1099         .tx_queue_release       = tap_tx_queue_release,
1100         .flow_ctrl_get          = tap_flow_ctrl_get,
1101         .flow_ctrl_set          = tap_flow_ctrl_set,
1102         .link_update            = tap_link_update,
1103         .dev_set_link_up        = tap_link_set_up,
1104         .dev_set_link_down      = tap_link_set_down,
1105         .promiscuous_enable     = tap_promisc_enable,
1106         .promiscuous_disable    = tap_promisc_disable,
1107         .allmulticast_enable    = tap_allmulti_enable,
1108         .allmulticast_disable   = tap_allmulti_disable,
1109         .mac_addr_set           = tap_mac_set,
1110         .mtu_set                = tap_mtu_set,
1111         .set_mc_addr_list       = tap_set_mc_addr_list,
1112         .stats_get              = tap_stats_get,
1113         .stats_reset            = tap_stats_reset,
1114         .dev_supported_ptypes_get = tap_dev_supported_ptypes_get,
1115         .filter_ctrl            = tap_dev_filter_ctrl,
1116 };
1117
1118 static int
1119 tap_kernel_support(struct pmd_internals *pmd)
1120 {
1121         struct utsname utsname;
1122         int ver[3];
1123
1124         if (uname(&utsname) == -1 ||
1125             sscanf(utsname.release, "%d.%d.%d",
1126                    &ver[0], &ver[1], &ver[2]) != 3)
1127                 return 0;
1128         if (KERNEL_VERSION(ver[0], ver[1], ver[2]) >= FLOWER_KERNEL_VERSION)
1129                 pmd->flower_support = 1;
1130         if (KERNEL_VERSION(ver[0], ver[1], ver[2]) >=
1131             FLOWER_VLAN_KERNEL_VERSION)
1132                 pmd->flower_vlan_support = 1;
1133         return 1;
1134 }
1135
1136 static int
1137 eth_dev_tap_create(struct rte_vdev_device *vdev, char *tap_name,
1138                    char *remote_iface)
1139 {
1140         int numa_node = rte_socket_id();
1141         struct rte_eth_dev *dev;
1142         struct pmd_internals *pmd;
1143         struct rte_eth_dev_data *data;
1144         int i;
1145
1146         RTE_LOG(DEBUG, PMD, "  TAP device on numa %u\n", rte_socket_id());
1147
1148         data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node);
1149         if (!data) {
1150                 RTE_LOG(ERR, PMD, "TAP Failed to allocate data\n");
1151                 goto error_exit;
1152         }
1153
1154         dev = rte_eth_vdev_allocate(vdev, sizeof(*pmd));
1155         if (!dev) {
1156                 RTE_LOG(ERR, PMD, "TAP Unable to allocate device struct\n");
1157                 goto error_exit;
1158         }
1159
1160         pmd = dev->data->dev_private;
1161         snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
1162         pmd->nb_queues = RTE_PMD_TAP_MAX_QUEUES;
1163
1164         pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
1165         if (pmd->ioctl_sock == -1) {
1166                 RTE_LOG(ERR, PMD,
1167                         "TAP Unable to get a socket for management: %s\n",
1168                         strerror(errno));
1169                 goto error_exit;
1170         }
1171
1172         /* Setup some default values */
1173         rte_memcpy(data, dev->data, sizeof(*data));
1174         data->dev_private = pmd;
1175         data->dev_flags = RTE_ETH_DEV_DETACHABLE | RTE_ETH_DEV_INTR_LSC;
1176         data->numa_node = numa_node;
1177         data->drv_name = pmd_tap_drv.driver.name;
1178
1179         data->dev_link = pmd_link;
1180         data->mac_addrs = &pmd->eth_addr;
1181         data->nb_rx_queues = pmd->nb_queues;
1182         data->nb_tx_queues = pmd->nb_queues;
1183
1184         dev->data = data;
1185         dev->dev_ops = &ops;
1186         dev->rx_pkt_burst = pmd_rx_burst;
1187         dev->tx_pkt_burst = pmd_tx_burst;
1188
1189         pmd->intr_handle.type = RTE_INTR_HANDLE_EXT;
1190         pmd->intr_handle.fd = -1;
1191
1192         /* Presetup the fds to -1 as being not valid */
1193         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1194                 pmd->rxq[i].fd = -1;
1195                 pmd->txq[i].fd = -1;
1196         }
1197
1198         tap_kernel_support(pmd);
1199         if (!pmd->flower_support)
1200                 return 0;
1201         LIST_INIT(&pmd->flows);
1202         /*
1203          * If no netlink socket can be created, then it will fail when
1204          * creating/destroying flow rules.
1205          */
1206         pmd->nlsk_fd = nl_init(0);
1207         if (strlen(remote_iface)) {
1208                 struct ifreq ifr;
1209
1210                 pmd->remote_if_index = if_nametoindex(remote_iface);
1211                 snprintf(pmd->remote_iface, RTE_ETH_NAME_MAX_LEN,
1212                          "%s", remote_iface);
1213                 if (!pmd->remote_if_index) {
1214                         RTE_LOG(ERR, PMD, "Could not find %s ifindex: "
1215                                 "remote interface will remain unconfigured\n",
1216                                 remote_iface);
1217                         return 0;
1218                 }
1219                 if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0) {
1220                         RTE_LOG(ERR, PMD, "Could not get remote MAC address\n");
1221                         goto error_exit;
1222                 }
1223                 rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data,
1224                            ETHER_ADDR_LEN);
1225         } else {
1226                 eth_random_addr((uint8_t *)&pmd->eth_addr);
1227         }
1228
1229         return 0;
1230
1231 error_exit:
1232         RTE_LOG(DEBUG, PMD, "TAP Unable to initialize %s\n",
1233                 rte_vdev_device_name(vdev));
1234
1235         rte_free(data);
1236         return -EINVAL;
1237 }
1238
1239 static int
1240 set_interface_name(const char *key __rte_unused,
1241                    const char *value,
1242                    void *extra_args)
1243 {
1244         char *name = (char *)extra_args;
1245
1246         if (value)
1247                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
1248         else
1249                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
1250                          DEFAULT_TAP_NAME, (tap_unit - 1));
1251
1252         return 0;
1253 }
1254
1255 static int
1256 set_interface_speed(const char *key __rte_unused,
1257                     const char *value,
1258                     void *extra_args)
1259 {
1260         *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G;
1261
1262         return 0;
1263 }
1264
1265 static int
1266 set_remote_iface(const char *key __rte_unused,
1267                  const char *value,
1268                  void *extra_args)
1269 {
1270         char *name = (char *)extra_args;
1271
1272         if (value)
1273                 snprintf(name, RTE_ETH_NAME_MAX_LEN, "%s", value);
1274
1275         return 0;
1276 }
1277
1278 /* Open a TAP interface device.
1279  */
1280 static int
1281 rte_pmd_tap_probe(struct rte_vdev_device *dev)
1282 {
1283         const char *name, *params;
1284         int ret;
1285         struct rte_kvargs *kvlist = NULL;
1286         int speed;
1287         char tap_name[RTE_ETH_NAME_MAX_LEN];
1288         char remote_iface[RTE_ETH_NAME_MAX_LEN];
1289
1290         name = rte_vdev_device_name(dev);
1291         params = rte_vdev_device_args(dev);
1292
1293         speed = ETH_SPEED_NUM_10G;
1294         snprintf(tap_name, sizeof(tap_name), "%s%d",
1295                  DEFAULT_TAP_NAME, tap_unit++);
1296         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
1297
1298         if (params && (params[0] != '\0')) {
1299                 RTE_LOG(DEBUG, PMD, "paramaters (%s)\n", params);
1300
1301                 kvlist = rte_kvargs_parse(params, valid_arguments);
1302                 if (kvlist) {
1303                         if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) {
1304                                 ret = rte_kvargs_process(kvlist,
1305                                                          ETH_TAP_SPEED_ARG,
1306                                                          &set_interface_speed,
1307                                                          &speed);
1308                                 if (ret == -1)
1309                                         goto leave;
1310                         }
1311
1312                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
1313                                 ret = rte_kvargs_process(kvlist,
1314                                                          ETH_TAP_IFACE_ARG,
1315                                                          &set_interface_name,
1316                                                          tap_name);
1317                                 if (ret == -1)
1318                                         goto leave;
1319                         }
1320
1321                         if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) {
1322                                 ret = rte_kvargs_process(kvlist,
1323                                                          ETH_TAP_REMOTE_ARG,
1324                                                          &set_remote_iface,
1325                                                          remote_iface);
1326                                 if (ret == -1)
1327                                         goto leave;
1328                         }
1329                 }
1330         }
1331         pmd_link.link_speed = speed;
1332
1333         RTE_LOG(NOTICE, PMD, "Initializing pmd_tap for %s as %s\n",
1334                 name, tap_name);
1335
1336         ret = eth_dev_tap_create(dev, tap_name, remote_iface);
1337
1338 leave:
1339         if (ret == -1) {
1340                 RTE_LOG(ERR, PMD, "Failed to create pmd for %s as %s\n",
1341                         name, tap_name);
1342                 tap_unit--;             /* Restore the unit number */
1343         }
1344         rte_kvargs_free(kvlist);
1345
1346         return ret;
1347 }
1348
1349 /* detach a TAP device.
1350  */
1351 static int
1352 rte_pmd_tap_remove(struct rte_vdev_device *dev)
1353 {
1354         struct rte_eth_dev *eth_dev = NULL;
1355         struct pmd_internals *internals;
1356         int i;
1357
1358         RTE_LOG(DEBUG, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
1359                 rte_socket_id());
1360
1361         /* find the ethdev entry */
1362         eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
1363         if (!eth_dev)
1364                 return 0;
1365
1366         internals = eth_dev->data->dev_private;
1367         if (internals->flower_support && internals->nlsk_fd) {
1368                 tap_flow_flush(eth_dev, NULL);
1369                 tap_flow_implicit_flush(internals, NULL);
1370                 nl_final(internals->nlsk_fd);
1371         }
1372         for (i = 0; i < internals->nb_queues; i++)
1373                 if (internals->rxq[i].fd != -1)
1374                         close(internals->rxq[i].fd);
1375
1376         close(internals->ioctl_sock);
1377         rte_free(eth_dev->data->dev_private);
1378         rte_free(eth_dev->data);
1379
1380         rte_eth_dev_release_port(eth_dev);
1381
1382         return 0;
1383 }
1384
1385 static struct rte_vdev_driver pmd_tap_drv = {
1386         .probe = rte_pmd_tap_probe,
1387         .remove = rte_pmd_tap_remove,
1388 };
1389 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
1390 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
1391 RTE_PMD_REGISTER_PARAM_STRING(net_tap,
1392                               ETH_TAP_IFACE_ARG "=<string> "
1393                               ETH_TAP_SPEED_ARG "=<int> "
1394                               ETH_TAP_REMOTE_ARG "=<string>");