drivers/net/tap/rte_eth_tap.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2016-2017 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_byteorder.h>
  37 #include <rte_common.h>
  38 #include <rte_mbuf.h>
  39 #include <rte_ethdev.h>
  40 #include <rte_ethdev_vdev.h>
  41 #include <rte_malloc.h>
  42 #include <rte_bus_vdev.h>
  43 #include <rte_kvargs.h>
  44 #include <rte_net.h>
  45 #include <rte_debug.h>
  46 #include <rte_ip.h>
  47
  48 #include <sys/types.h>
  49 #include <sys/stat.h>
  50 #include <sys/socket.h>
  51 #include <sys/ioctl.h>
  52 #include <sys/utsname.h>
  53 #include <sys/mman.h>
  54 #include <errno.h>
  55 #include <signal.h>
  56 #include <stdint.h>
  57 #include <sys/uio.h>
  58 #include <unistd.h>
  59 #include <arpa/inet.h>
  60 #include <net/if.h>
  61 #include <linux/if_tun.h>
  62 #include <linux/if_ether.h>
  63 #include <linux/version.h>
  64 #include <fcntl.h>
  65
  66 #include <rte_eth_tap.h>
  67 #include <tap_flow.h>
  68 #include <tap_netlink.h>
  69 #include <tap_tcmsgs.h>
  70
  71 /* Linux based path to the TUN device */
  72 #define TUN_TAP_DEV_PATH        "/dev/net/tun"
  73 #define DEFAULT_TAP_NAME        "dtap"
  74
  75 #define ETH_TAP_IFACE_ARG       "iface"
  76 #define ETH_TAP_SPEED_ARG       "speed"
  77 #define ETH_TAP_REMOTE_ARG      "remote"
  78 #define ETH_TAP_MAC_ARG         "mac"
  79 #define ETH_TAP_MAC_FIXED       "fixed"
  80
  81 #define FLOWER_KERNEL_VERSION KERNEL_VERSION(4, 2, 0)
  82 #define FLOWER_VLAN_KERNEL_VERSION KERNEL_VERSION(4, 9, 0)
  83
  84 static struct rte_vdev_driver pmd_tap_drv;
  85
  86 static const char *valid_arguments[] = {
  87         ETH_TAP_IFACE_ARG,
  88         ETH_TAP_SPEED_ARG,
  89         ETH_TAP_REMOTE_ARG,
  90         ETH_TAP_MAC_ARG,
  91         NULL
  92 };
  93
  94 static int tap_unit;
  95
  96 static volatile uint32_t tap_trigger;   /* Rx trigger */
  97
  98 static struct rte_eth_link pmd_link = {
  99         .link_speed = ETH_SPEED_NUM_10G,
 100         .link_duplex = ETH_LINK_FULL_DUPLEX,
 101         .link_status = ETH_LINK_DOWN,
 102         .link_autoneg = ETH_LINK_SPEED_AUTONEG
 103 };
 104
 105 static void
 106 tap_trigger_cb(int sig __rte_unused)
 107 {
 108         /* Valid trigger values are nonzero */
 109         tap_trigger = (tap_trigger + 1) | 0x80000000;
 110 }
 111
 112 /* Specifies on what netdevices the ioctl should be applied */
 113 enum ioctl_mode {
 114         LOCAL_AND_REMOTE,
 115         LOCAL_ONLY,
 116         REMOTE_ONLY,
 117 };
 118
 119 static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
 120
 121 /* Tun/Tap allocation routine
 122  *
 123  * name is the number of the interface to use, unless NULL to take the host
 124  * supplied name.
 125  */
 126 static int
 127 tun_alloc(struct pmd_internals *pmd)
 128 {
 129         struct ifreq ifr;
 130 #ifdef IFF_MULTI_QUEUE
 131         unsigned int features;
 132 #endif
 133         int fd;
 134
 135         memset(&ifr, 0, sizeof(struct ifreq));
 136
 137         /*
 138          * Do not set IFF_NO_PI as packet information header will be needed
 139          * to check if a received packet has been truncated.
 140          */
 141         ifr.ifr_flags = IFF_TAP;
 142         snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
 143
 144         RTE_LOG(DEBUG, PMD, "ifr_name '%s'\n", ifr.ifr_name);
 145
 146         fd = open(TUN_TAP_DEV_PATH, O_RDWR);
 147         if (fd < 0) {
 148                 RTE_LOG(ERR, PMD, "Unable to create TAP interface\n");
 149                 goto error;
 150         }
 151
 152 #ifdef IFF_MULTI_QUEUE
 153         /* Grab the TUN features to verify we can work multi-queue */
 154         if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
 155                 RTE_LOG(ERR, PMD, "TAP unable to get TUN/TAP features\n");
 156                 goto error;
 157         }
 158         RTE_LOG(DEBUG, PMD, "  TAP Features %08x\n", features);
 159
 160         if (features & IFF_MULTI_QUEUE) {
 161                 RTE_LOG(DEBUG, PMD, "  Multi-queue support for %d queues\n",
 162                         RTE_PMD_TAP_MAX_QUEUES);
 163                 ifr.ifr_flags |= IFF_MULTI_QUEUE;
 164         } else
 165 #endif
 166         {
 167                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 168                 RTE_LOG(DEBUG, PMD, "  Single queue only support\n");
 169         }
 170
 171         /* Set the TUN/TAP configuration and set the name if needed */
 172         if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
 173                 RTE_LOG(WARNING, PMD,
 174                         "Unable to set TUNSETIFF for %s\n",
 175                         ifr.ifr_name);
 176                 perror("TUNSETIFF");
 177                 goto error;
 178         }
 179
 180         /* Always set the file descriptor to non-blocking */
 181         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
 182                 RTE_LOG(WARNING, PMD,
 183                         "Unable to set %s to nonblocking\n",
 184                         ifr.ifr_name);
 185                 perror("F_SETFL, NONBLOCK");
 186                 goto error;
 187         }
 188
 189         /* Set up trigger to optimize empty Rx bursts */
 190         errno = 0;
 191         do {
 192                 struct sigaction sa;
 193                 int flags = fcntl(fd, F_GETFL);
 194
 195                 if (flags == -1 || sigaction(SIGIO, NULL, &sa) == -1)
 196                         break;
 197                 if (sa.sa_handler != tap_trigger_cb) {
 198                         /*
 199                          * Make sure SIGIO is not already taken. This is done
 200                          * as late as possible to leave the application a
 201                          * chance to set up its own signal handler first.
 202                          */
 203                         if (sa.sa_handler != SIG_IGN &&
 204                             sa.sa_handler != SIG_DFL) {
 205                                 errno = EBUSY;
 206                                 break;
 207                         }
 208                         sa = (struct sigaction){
 209                                 .sa_flags = SA_RESTART,
 210                                 .sa_handler = tap_trigger_cb,
 211                         };
 212                         if (sigaction(SIGIO, &sa, NULL) == -1)
 213                                 break;
 214                 }
 215                 /* Enable SIGIO on file descriptor */
 216                 fcntl(fd, F_SETFL, flags | O_ASYNC);
 217                 fcntl(fd, F_SETOWN, getpid());
 218         } while (0);
 219         if (errno) {
 220                 /* Disable trigger globally in case of error */
 221                 tap_trigger = 0;
 222                 RTE_LOG(WARNING, PMD, "Rx trigger disabled: %s\n",
 223                         strerror(errno));
 224         }
 225
 226         return fd;
 227
 228 error:
 229         if (fd > 0)
 230                 close(fd);
 231         return -1;
 232 }
 233
 234 static void
 235 tap_verify_csum(struct rte_mbuf *mbuf)
 236 {
 237         uint32_t l2 = mbuf->packet_type & RTE_PTYPE_L2_MASK;
 238         uint32_t l3 = mbuf->packet_type & RTE_PTYPE_L3_MASK;
 239         uint32_t l4 = mbuf->packet_type & RTE_PTYPE_L4_MASK;
 240         unsigned int l2_len = sizeof(struct ether_hdr);
 241         unsigned int l3_len;
 242         uint16_t cksum = 0;
 243         void *l3_hdr;
 244         void *l4_hdr;
 245
 246         if (l2 == RTE_PTYPE_L2_ETHER_VLAN)
 247                 l2_len += 4;
 248         else if (l2 == RTE_PTYPE_L2_ETHER_QINQ)
 249                 l2_len += 8;
 250         /* Don't verify checksum for packets with discontinuous L2 header */
 251         if (unlikely(l2_len + sizeof(struct ipv4_hdr) >
 252                      rte_pktmbuf_data_len(mbuf)))
 253                 return;
 254         l3_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len);
 255         if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
 256                 struct ipv4_hdr *iph = l3_hdr;
 257
 258                 /* ihl contains the number of 4-byte words in the header */
 259                 l3_len = 4 * (iph->version_ihl & 0xf);
 260                 if (unlikely(l2_len + l3_len > rte_pktmbuf_data_len(mbuf)))
 261                         return;
 262
 263                 cksum = ~rte_raw_cksum(iph, l3_len);
 264                 mbuf->ol_flags |= cksum ?
 265                         PKT_RX_IP_CKSUM_BAD :
 266                         PKT_RX_IP_CKSUM_GOOD;
 267         } else if (l3 == RTE_PTYPE_L3_IPV6) {
 268                 l3_len = sizeof(struct ipv6_hdr);
 269         } else {
 270                 /* IPv6 extensions are not supported */
 271                 return;
 272         }
 273         if (l4 == RTE_PTYPE_L4_UDP || l4 == RTE_PTYPE_L4_TCP) {
 274                 l4_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len + l3_len);
 275                 /* Don't verify checksum for multi-segment packets. */
 276                 if (mbuf->nb_segs > 1)
 277                         return;
 278                 if (l3 == RTE_PTYPE_L3_IPV4)
 279                         cksum = ~rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
 280                 else if (l3 == RTE_PTYPE_L3_IPV6)
 281                         cksum = ~rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
 282                 mbuf->ol_flags |= cksum ?
 283                         PKT_RX_L4_CKSUM_BAD :
 284                         PKT_RX_L4_CKSUM_GOOD;
 285         }
 286 }
 287
 288 /* Callback to handle the rx burst of packets to the correct interface and
 289  * file descriptor(s) in a multi-queue setup.
 290  */
 291 static uint16_t
 292 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 293 {
 294         struct rx_queue *rxq = queue;
 295         uint16_t num_rx;
 296         unsigned long num_rx_bytes = 0;
 297         uint32_t trigger = tap_trigger;
 298
 299         if (trigger == rxq->trigger_seen)
 300                 return 0;
 301         if (trigger)
 302                 rxq->trigger_seen = trigger;
 303         rte_compiler_barrier();
 304         for (num_rx = 0; num_rx < nb_pkts; ) {
 305                 struct rte_mbuf *mbuf = rxq->pool;
 306                 struct rte_mbuf *seg = NULL;
 307                 struct rte_mbuf *new_tail = NULL;
 308                 uint16_t data_off = rte_pktmbuf_headroom(mbuf);
 309                 int len;
 310
 311                 len = readv(rxq->fd, *rxq->iovecs,
 312                             1 + (rxq->rxmode->enable_scatter ?
 313                                  rxq->nb_rx_desc : 1));
 314                 if (len < (int)sizeof(struct tun_pi))
 315                         break;
 316
 317                 /* Packet couldn't fit in the provided mbuf */
 318                 if (unlikely(rxq->pi.flags & TUN_PKT_STRIP)) {
 319                         rxq->stats.ierrors++;
 320                         continue;
 321                 }
 322
 323                 len -= sizeof(struct tun_pi);
 324
 325                 mbuf->pkt_len = len;
 326                 mbuf->port = rxq->in_port;
 327                 while (1) {
 328                         struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp);
 329
 330                         if (unlikely(!buf)) {
 331                                 rxq->stats.rx_nombuf++;
 332                                 /* No new buf has been allocated: do nothing */
 333                                 if (!new_tail || !seg)
 334                                         goto end;
 335
 336                                 seg->next = NULL;
 337                                 rte_pktmbuf_free(mbuf);
 338
 339                                 goto end;
 340                         }
 341                         seg = seg ? seg->next : mbuf;
 342                         if (rxq->pool == mbuf)
 343                                 rxq->pool = buf;
 344                         if (new_tail)
 345                                 new_tail->next = buf;
 346                         new_tail = buf;
 347                         new_tail->next = seg->next;
 348
 349                         /* iovecs[0] is reserved for packet info (pi) */
 350                         (*rxq->iovecs)[mbuf->nb_segs].iov_len =
 351                                 buf->buf_len - data_off;
 352                         (*rxq->iovecs)[mbuf->nb_segs].iov_base =
 353                                 (char *)buf->buf_addr + data_off;
 354
 355                         seg->data_len = RTE_MIN(seg->buf_len - data_off, len);
 356                         seg->data_off = data_off;
 357
 358                         len -= seg->data_len;
 359                         if (len <= 0)
 360                                 break;
 361                         mbuf->nb_segs++;
 362                         /* First segment has headroom, not the others */
 363                         data_off = 0;
 364                 }
 365                 seg->next = NULL;
 366                 mbuf->packet_type = rte_net_get_ptype(mbuf, NULL,
 367                                                       RTE_PTYPE_ALL_MASK);
 368                 if (rxq->rxmode->hw_ip_checksum)
 369                         tap_verify_csum(mbuf);
 370
 371                 /* account for the receive frame */
 372                 bufs[num_rx++] = mbuf;
 373                 num_rx_bytes += mbuf->pkt_len;
 374         }
 375 end:
 376         rxq->stats.ipackets += num_rx;
 377         rxq->stats.ibytes += num_rx_bytes;
 378
 379         return num_rx;
 380 }
 381
 382 static void
 383 tap_tx_offload(char *packet, uint64_t ol_flags, unsigned int l2_len,
 384                unsigned int l3_len)
 385 {
 386         void *l3_hdr = packet + l2_len;
 387
 388         if (ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4)) {
 389                 struct ipv4_hdr *iph = l3_hdr;
 390                 uint16_t cksum;
 391
 392                 iph->hdr_checksum = 0;
 393                 cksum = rte_raw_cksum(iph, l3_len);
 394                 iph->hdr_checksum = (cksum == 0xffff) ? cksum : ~cksum;
 395         }
 396         if (ol_flags & PKT_TX_L4_MASK) {
 397                 uint16_t l4_len;
 398                 uint32_t cksum;
 399                 uint16_t *l4_cksum;
 400                 void *l4_hdr;
 401
 402                 l4_hdr = packet + l2_len + l3_len;
 403                 if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM)
 404                         l4_cksum = &((struct udp_hdr *)l4_hdr)->dgram_cksum;
 405                 else if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM)
 406                         l4_cksum = &((struct tcp_hdr *)l4_hdr)->cksum;
 407                 else
 408                         return;
 409                 *l4_cksum = 0;
 410                 if (ol_flags & PKT_TX_IPV4) {
 411                         struct ipv4_hdr *iph = l3_hdr;
 412
 413                         l4_len = rte_be_to_cpu_16(iph->total_length) - l3_len;
 414                         cksum = rte_ipv4_phdr_cksum(l3_hdr, 0);
 415                 } else {
 416                         struct ipv6_hdr *ip6h = l3_hdr;
 417
 418                         /* payload_len does not include ext headers */
 419                         l4_len = rte_be_to_cpu_16(ip6h->payload_len) -
 420                                 l3_len + sizeof(struct ipv6_hdr);
 421                         cksum = rte_ipv6_phdr_cksum(l3_hdr, 0);
 422                 }
 423                 cksum += rte_raw_cksum(l4_hdr, l4_len);
 424                 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
 425                 cksum = (~cksum) & 0xffff;
 426                 if (cksum == 0)
 427                         cksum = 0xffff;
 428                 *l4_cksum = cksum;
 429         }
 430 }
 431
 432 /* Callback to handle sending packets from the tap interface
 433  */
 434 static uint16_t
 435 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 436 {
 437         struct tx_queue *txq = queue;
 438         uint16_t num_tx = 0;
 439         unsigned long num_tx_bytes = 0;
 440         uint32_t max_size;
 441         int i;
 442
 443         if (unlikely(nb_pkts == 0))
 444                 return 0;
 445
 446         max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4);
 447         for (i = 0; i < nb_pkts; i++) {
 448                 struct rte_mbuf *mbuf = bufs[num_tx];
 449                 struct iovec iovecs[mbuf->nb_segs + 1];
 450                 struct tun_pi pi = { .flags = 0 };
 451                 struct rte_mbuf *seg = mbuf;
 452                 char m_copy[mbuf->data_len];
 453                 int n;
 454                 int j;
 455
 456                 /* stats.errs will be incremented */
 457                 if (rte_pktmbuf_pkt_len(mbuf) > max_size)
 458                         break;
 459
 460                 iovecs[0].iov_base = &pi;
 461                 iovecs[0].iov_len = sizeof(pi);
 462                 for (j = 1; j <= mbuf->nb_segs; j++) {
 463                         iovecs[j].iov_len = rte_pktmbuf_data_len(seg);
 464                         iovecs[j].iov_base =
 465                                 rte_pktmbuf_mtod(seg, void *);
 466                         seg = seg->next;
 467                 }
 468                 if (mbuf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4) ||
 469                     (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM ||
 470                     (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM) {
 471                         /* Support only packets with all data in the same seg */
 472                         if (mbuf->nb_segs > 1)
 473                                 break;
 474                         /* To change checksums, work on a copy of data. */
 475                         rte_memcpy(m_copy, rte_pktmbuf_mtod(mbuf, void *),
 476                                    rte_pktmbuf_data_len(mbuf));
 477                         tap_tx_offload(m_copy, mbuf->ol_flags,
 478                                        mbuf->l2_len, mbuf->l3_len);
 479                         iovecs[1].iov_base = m_copy;
 480                 }
 481                 /* copy the tx frame data */
 482                 n = writev(txq->fd, iovecs, mbuf->nb_segs + 1);
 483                 if (n <= 0)
 484                         break;
 485
 486                 num_tx++;
 487                 num_tx_bytes += mbuf->pkt_len;
 488                 rte_pktmbuf_free(mbuf);
 489         }
 490
 491         txq->stats.opackets += num_tx;
 492         txq->stats.errs += nb_pkts - num_tx;
 493         txq->stats.obytes += num_tx_bytes;
 494
 495         return num_tx;
 496 }
 497
 498 static const char *
 499 tap_ioctl_req2str(unsigned long request)
 500 {
 501         switch (request) {
 502         case SIOCSIFFLAGS:
 503                 return "SIOCSIFFLAGS";
 504         case SIOCGIFFLAGS:
 505                 return "SIOCGIFFLAGS";
 506         case SIOCGIFHWADDR:
 507                 return "SIOCGIFHWADDR";
 508         case SIOCSIFHWADDR:
 509                 return "SIOCSIFHWADDR";
 510         case SIOCSIFMTU:
 511                 return "SIOCSIFMTU";
 512         }
 513         return "UNKNOWN";
 514 }
 515
 516 static int
 517 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 518           struct ifreq *ifr, int set, enum ioctl_mode mode)
 519 {
 520         short req_flags = ifr->ifr_flags;
 521         int remote = pmd->remote_if_index &&
 522                 (mode == REMOTE_ONLY || mode == LOCAL_AND_REMOTE);
 523
 524         if (!pmd->remote_if_index && mode == REMOTE_ONLY)
 525                 return 0;
 526         /*
 527          * If there is a remote netdevice, apply ioctl on it, then apply it on
 528          * the tap netdevice.
 529          */
 530 apply:
 531         if (remote)
 532                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->remote_iface);
 533         else if (mode == LOCAL_ONLY || mode == LOCAL_AND_REMOTE)
 534                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->name);
 535         switch (request) {
 536         case SIOCSIFFLAGS:
 537                 /* fetch current flags to leave other flags untouched */
 538                 if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
 539                         goto error;
 540                 if (set)
 541                         ifr->ifr_flags |= req_flags;
 542                 else
 543                         ifr->ifr_flags &= ~req_flags;
 544                 break;
 545         case SIOCGIFFLAGS:
 546         case SIOCGIFHWADDR:
 547         case SIOCSIFHWADDR:
 548         case SIOCSIFMTU:
 549                 break;
 550         default:
 551                 RTE_ASSERT(!"unsupported request type: must not happen");
 552         }
 553         if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
 554                 goto error;
 555         if (remote-- && mode == LOCAL_AND_REMOTE)
 556                 goto apply;
 557         return 0;
 558
 559 error:
 560         RTE_LOG(DEBUG, PMD, "%s: %s(%s) failed: %s(%d)\n", ifr->ifr_name,
 561                 __func__, tap_ioctl_req2str(request), strerror(errno), errno);
 562         return -errno;
 563 }
 564
 565 static int
 566 tap_link_set_down(struct rte_eth_dev *dev)
 567 {
 568         struct pmd_internals *pmd = dev->data->dev_private;
 569         struct ifreq ifr = { .ifr_flags = IFF_UP };
 570
 571         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 572         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_ONLY);
 573 }
 574
 575 static int
 576 tap_link_set_up(struct rte_eth_dev *dev)
 577 {
 578         struct pmd_internals *pmd = dev->data->dev_private;
 579         struct ifreq ifr = { .ifr_flags = IFF_UP };
 580
 581         dev->data->dev_link.link_status = ETH_LINK_UP;
 582         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 583 }
 584
 585 static int
 586 tap_dev_start(struct rte_eth_dev *dev)
 587 {
 588         int err;
 589
 590         err = tap_intr_handle_set(dev, 1);
 591         if (err)
 592                 return err;
 593         return tap_link_set_up(dev);
 594 }
 595
 596 /* This function gets called when the current port gets stopped.
 597  */
 598 static void
 599 tap_dev_stop(struct rte_eth_dev *dev)
 600 {
 601         tap_intr_handle_set(dev, 0);
 602         tap_link_set_down(dev);
 603 }
 604
 605 static int
 606 tap_dev_configure(struct rte_eth_dev *dev)
 607 {
 608         if (dev->data->nb_rx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 609                 RTE_LOG(ERR, PMD,
 610                         "%s: number of rx queues %d exceeds max num of queues %d\n",
 611                         dev->device->name,
 612                         dev->data->nb_rx_queues,
 613                         RTE_PMD_TAP_MAX_QUEUES);
 614                 return -1;
 615         }
 616         if (dev->data->nb_tx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 617                 RTE_LOG(ERR, PMD,
 618                         "%s: number of tx queues %d exceeds max num of queues %d\n",
 619                         dev->device->name,
 620                         dev->data->nb_tx_queues,
 621                         RTE_PMD_TAP_MAX_QUEUES);
 622                 return -1;
 623         }
 624
 625         RTE_LOG(INFO, PMD, "%s: %p: TX configured queues number: %u\n",
 626              dev->device->name, (void *)dev, dev->data->nb_tx_queues);
 627
 628         RTE_LOG(INFO, PMD, "%s: %p: RX configured queues number: %u\n",
 629              dev->device->name, (void *)dev, dev->data->nb_rx_queues);
 630
 631         return 0;
 632 }
 633
 634 static uint32_t
 635 tap_dev_speed_capa(void)
 636 {
 637         uint32_t speed = pmd_link.link_speed;
 638         uint32_t capa = 0;
 639
 640         if (speed >= ETH_SPEED_NUM_10M)
 641                 capa |= ETH_LINK_SPEED_10M;
 642         if (speed >= ETH_SPEED_NUM_100M)
 643                 capa |= ETH_LINK_SPEED_100M;
 644         if (speed >= ETH_SPEED_NUM_1G)
 645                 capa |= ETH_LINK_SPEED_1G;
 646         if (speed >= ETH_SPEED_NUM_5G)
 647                 capa |= ETH_LINK_SPEED_2_5G;
 648         if (speed >= ETH_SPEED_NUM_5G)
 649                 capa |= ETH_LINK_SPEED_5G;
 650         if (speed >= ETH_SPEED_NUM_10G)
 651                 capa |= ETH_LINK_SPEED_10G;
 652         if (speed >= ETH_SPEED_NUM_20G)
 653                 capa |= ETH_LINK_SPEED_20G;
 654         if (speed >= ETH_SPEED_NUM_25G)
 655                 capa |= ETH_LINK_SPEED_25G;
 656         if (speed >= ETH_SPEED_NUM_40G)
 657                 capa |= ETH_LINK_SPEED_40G;
 658         if (speed >= ETH_SPEED_NUM_50G)
 659                 capa |= ETH_LINK_SPEED_50G;
 660         if (speed >= ETH_SPEED_NUM_56G)
 661                 capa |= ETH_LINK_SPEED_56G;
 662         if (speed >= ETH_SPEED_NUM_100G)
 663                 capa |= ETH_LINK_SPEED_100G;
 664
 665         return capa;
 666 }
 667
 668 static void
 669 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 670 {
 671         struct pmd_internals *internals = dev->data->dev_private;
 672
 673         dev_info->if_index = internals->if_index;
 674         dev_info->max_mac_addrs = 1;
 675         dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
 676         dev_info->max_rx_queues = RTE_PMD_TAP_MAX_QUEUES;
 677         dev_info->max_tx_queues = RTE_PMD_TAP_MAX_QUEUES;
 678         dev_info->min_rx_bufsize = 0;
 679         dev_info->pci_dev = NULL;
 680         dev_info->speed_capa = tap_dev_speed_capa();
 681         dev_info->rx_offload_capa = (DEV_RX_OFFLOAD_IPV4_CKSUM |
 682                                      DEV_RX_OFFLOAD_UDP_CKSUM |
 683                                      DEV_RX_OFFLOAD_TCP_CKSUM);
 684         dev_info->tx_offload_capa =
 685                 (DEV_TX_OFFLOAD_IPV4_CKSUM |
 686                  DEV_TX_OFFLOAD_UDP_CKSUM |
 687                  DEV_TX_OFFLOAD_TCP_CKSUM);
 688 }
 689
 690 static int
 691 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
 692 {
 693         unsigned int i, imax;
 694         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 695         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 696         unsigned long rx_nombuf = 0, ierrors = 0;
 697         const struct pmd_internals *pmd = dev->data->dev_private;
 698
 699         /* rx queue statistics */
 700         imax = (dev->data->nb_rx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 701                 dev->data->nb_rx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 702         for (i = 0; i < imax; i++) {
 703                 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
 704                 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
 705                 rx_total += tap_stats->q_ipackets[i];
 706                 rx_bytes_total += tap_stats->q_ibytes[i];
 707                 rx_nombuf += pmd->rxq[i].stats.rx_nombuf;
 708                 ierrors += pmd->rxq[i].stats.ierrors;
 709         }
 710
 711         /* tx queue statistics */
 712         imax = (dev->data->nb_tx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 713                 dev->data->nb_tx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 714
 715         for (i = 0; i < imax; i++) {
 716                 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
 717                 tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
 718                 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
 719                 tx_total += tap_stats->q_opackets[i];
 720                 tx_err_total += tap_stats->q_errors[i];
 721                 tx_bytes_total += tap_stats->q_obytes[i];
 722         }
 723
 724         tap_stats->ipackets = rx_total;
 725         tap_stats->ibytes = rx_bytes_total;
 726         tap_stats->ierrors = ierrors;
 727         tap_stats->rx_nombuf = rx_nombuf;
 728         tap_stats->opackets = tx_total;
 729         tap_stats->oerrors = tx_err_total;
 730         tap_stats->obytes = tx_bytes_total;
 731         return 0;
 732 }
 733
 734 static void
 735 tap_stats_reset(struct rte_eth_dev *dev)
 736 {
 737         int i;
 738         struct pmd_internals *pmd = dev->data->dev_private;
 739
 740         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 741                 pmd->rxq[i].stats.ipackets = 0;
 742                 pmd->rxq[i].stats.ibytes = 0;
 743                 pmd->rxq[i].stats.ierrors = 0;
 744                 pmd->rxq[i].stats.rx_nombuf = 0;
 745
 746                 pmd->txq[i].stats.opackets = 0;
 747                 pmd->txq[i].stats.errs = 0;
 748                 pmd->txq[i].stats.obytes = 0;
 749         }
 750 }
 751
 752 static void
 753 tap_dev_close(struct rte_eth_dev *dev)
 754 {
 755         int i;
 756         struct pmd_internals *internals = dev->data->dev_private;
 757
 758         tap_link_set_down(dev);
 759         tap_flow_flush(dev, NULL);
 760         tap_flow_implicit_flush(internals, NULL);
 761
 762         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 763                 if (internals->rxq[i].fd != -1) {
 764                         close(internals->rxq[i].fd);
 765                         internals->rxq[i].fd = -1;
 766                 }
 767                 if (internals->txq[i].fd != -1) {
 768                         close(internals->txq[i].fd);
 769                         internals->txq[i].fd = -1;
 770                 }
 771         }
 772
 773         if (internals->remote_if_index) {
 774                 /* Restore initial remote state */
 775                 ioctl(internals->ioctl_sock, SIOCSIFFLAGS,
 776                                 &internals->remote_initial_flags);
 777         }
 778 }
 779
 780 static void
 781 tap_rx_queue_release(void *queue)
 782 {
 783         struct rx_queue *rxq = queue;
 784
 785         if (rxq && (rxq->fd > 0)) {
 786                 close(rxq->fd);
 787                 rxq->fd = -1;
 788                 rte_pktmbuf_free(rxq->pool);
 789                 rte_free(rxq->iovecs);
 790                 rxq->pool = NULL;
 791                 rxq->iovecs = NULL;
 792         }
 793 }
 794
 795 static void
 796 tap_tx_queue_release(void *queue)
 797 {
 798         struct tx_queue *txq = queue;
 799
 800         if (txq && (txq->fd > 0)) {
 801                 close(txq->fd);
 802                 txq->fd = -1;
 803         }
 804 }
 805
 806 static int
 807 tap_link_update(struct rte_eth_dev *dev, int wait_to_complete __rte_unused)
 808 {
 809         struct rte_eth_link *dev_link = &dev->data->dev_link;
 810         struct pmd_internals *pmd = dev->data->dev_private;
 811         struct ifreq ifr = { .ifr_flags = 0 };
 812
 813         if (pmd->remote_if_index) {
 814                 tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, REMOTE_ONLY);
 815                 if (!(ifr.ifr_flags & IFF_UP) ||
 816                     !(ifr.ifr_flags & IFF_RUNNING)) {
 817                         dev_link->link_status = ETH_LINK_DOWN;
 818                         return 0;
 819                 }
 820         }
 821         tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, LOCAL_ONLY);
 822         dev_link->link_status =
 823                 ((ifr.ifr_flags & IFF_UP) && (ifr.ifr_flags & IFF_RUNNING) ?
 824                  ETH_LINK_UP :
 825                  ETH_LINK_DOWN);
 826         return 0;
 827 }
 828
 829 static void
 830 tap_promisc_enable(struct rte_eth_dev *dev)
 831 {
 832         struct pmd_internals *pmd = dev->data->dev_private;
 833         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 834
 835         dev->data->promiscuous = 1;
 836         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 837         if (pmd->remote_if_index && !pmd->flow_isolate)
 838                 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC);
 839 }
 840
 841 static void
 842 tap_promisc_disable(struct rte_eth_dev *dev)
 843 {
 844         struct pmd_internals *pmd = dev->data->dev_private;
 845         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 846
 847         dev->data->promiscuous = 0;
 848         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 849         if (pmd->remote_if_index && !pmd->flow_isolate)
 850                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC);
 851 }
 852
 853 static void
 854 tap_allmulti_enable(struct rte_eth_dev *dev)
 855 {
 856         struct pmd_internals *pmd = dev->data->dev_private;
 857         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 858
 859         dev->data->all_multicast = 1;
 860         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 861         if (pmd->remote_if_index && !pmd->flow_isolate)
 862                 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI);
 863 }
 864
 865 static void
 866 tap_allmulti_disable(struct rte_eth_dev *dev)
 867 {
 868         struct pmd_internals *pmd = dev->data->dev_private;
 869         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 870
 871         dev->data->all_multicast = 0;
 872         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 873         if (pmd->remote_if_index && !pmd->flow_isolate)
 874                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI);
 875 }
 876
 877 static void
 878 tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
 879 {
 880         struct pmd_internals *pmd = dev->data->dev_private;
 881         enum ioctl_mode mode = LOCAL_ONLY;
 882         struct ifreq ifr;
 883
 884         if (is_zero_ether_addr(mac_addr)) {
 885                 RTE_LOG(ERR, PMD, "%s: can't set an empty MAC address\n",
 886                         dev->device->name);
 887                 return;
 888         }
 889         /* Check the actual current MAC address on the tap netdevice */
 890         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
 891                 return;
 892         if (is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 893                                mac_addr))
 894                 return;
 895         /* Check the current MAC address on the remote */
 896         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0)
 897                 return;
 898         if (!is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 899                                mac_addr))
 900                 mode = LOCAL_AND_REMOTE;
 901         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
 902         rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETHER_ADDR_LEN);
 903         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1, mode) < 0)
 904                 return;
 905         rte_memcpy(&pmd->eth_addr, mac_addr, ETHER_ADDR_LEN);
 906         if (pmd->remote_if_index && !pmd->flow_isolate) {
 907                 /* Replace MAC redirection rule after a MAC change */
 908                 if (tap_flow_implicit_destroy(pmd, TAP_REMOTE_LOCAL_MAC) < 0) {
 909                         RTE_LOG(ERR, PMD,
 910                                 "%s: Couldn't delete MAC redirection rule\n",
 911                                 dev->device->name);
 912                         return;
 913                 }
 914                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0)
 915                         RTE_LOG(ERR, PMD,
 916                                 "%s: Couldn't add MAC redirection rule\n",
 917                                 dev->device->name);
 918         }
 919 }
 920
 921 static int
 922 tap_setup_queue(struct rte_eth_dev *dev,
 923                 struct pmd_internals *internals,
 924                 uint16_t qid,
 925                 int is_rx)
 926 {
 927         int *fd;
 928         int *other_fd;
 929         const char *dir;
 930         struct pmd_internals *pmd = dev->data->dev_private;
 931         struct rx_queue *rx = &internals->rxq[qid];
 932         struct tx_queue *tx = &internals->txq[qid];
 933
 934         if (is_rx) {
 935                 fd = &rx->fd;
 936                 other_fd = &tx->fd;
 937                 dir = "rx";
 938         } else {
 939                 fd = &tx->fd;
 940                 other_fd = &rx->fd;
 941                 dir = "tx";
 942         }
 943         if (*fd != -1) {
 944                 /* fd for this queue already exists */
 945                 RTE_LOG(DEBUG, PMD, "%s: fd %d for %s queue qid %d exists\n",
 946                         pmd->name, *fd, dir, qid);
 947         } else if (*other_fd != -1) {
 948                 /* Only other_fd exists. dup it */
 949                 *fd = dup(*other_fd);
 950                 if (*fd < 0) {
 951                         *fd = -1;
 952                         RTE_LOG(ERR, PMD, "%s: dup() failed.\n",
 953                                 pmd->name);
 954                         return -1;
 955                 }
 956                 RTE_LOG(DEBUG, PMD, "%s: dup fd %d for %s queue qid %d (%d)\n",
 957                         pmd->name, *other_fd, dir, qid, *fd);
 958         } else {
 959                 /* Both RX and TX fds do not exist (equal -1). Create fd */
 960                 *fd = tun_alloc(pmd);
 961                 if (*fd < 0) {
 962                         *fd = -1; /* restore original value */
 963                         RTE_LOG(ERR, PMD, "%s: tun_alloc() failed.\n",
 964                                 pmd->name);
 965                         return -1;
 966                 }
 967                 RTE_LOG(DEBUG, PMD, "%s: add %s queue for qid %d fd %d\n",
 968                         pmd->name, dir, qid, *fd);
 969         }
 970
 971         tx->mtu = &dev->data->mtu;
 972         rx->rxmode = &dev->data->dev_conf.rxmode;
 973
 974         return *fd;
 975 }
 976
 977 static int
 978 tap_rx_queue_setup(struct rte_eth_dev *dev,
 979                    uint16_t rx_queue_id,
 980                    uint16_t nb_rx_desc,
 981                    unsigned int socket_id,
 982                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 983                    struct rte_mempool *mp)
 984 {
 985         struct pmd_internals *internals = dev->data->dev_private;
 986         struct rx_queue *rxq = &internals->rxq[rx_queue_id];
 987         struct rte_mbuf **tmp = &rxq->pool;
 988         long iov_max = sysconf(_SC_IOV_MAX);
 989         uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
 990         struct iovec (*iovecs)[nb_desc + 1];
 991         int data_off = RTE_PKTMBUF_HEADROOM;
 992         int ret = 0;
 993         int fd;
 994         int i;
 995
 996         if (rx_queue_id >= dev->data->nb_rx_queues || !mp) {
 997                 RTE_LOG(WARNING, PMD,
 998                         "nb_rx_queues %d too small or mempool NULL\n",
 999                         dev->data->nb_rx_queues);
1000                 return -1;
1001         }
1002
1003         rxq->mp = mp;
1004         rxq->trigger_seen = 1; /* force initial burst */
1005         rxq->in_port = dev->data->port_id;
1006         rxq->nb_rx_desc = nb_desc;
1007         iovecs = rte_zmalloc_socket(dev->device->name, sizeof(*iovecs), 0,
1008                                     socket_id);
1009         if (!iovecs) {
1010                 RTE_LOG(WARNING, PMD,
1011                         "%s: Couldn't allocate %d RX descriptors\n",
1012                         dev->device->name, nb_desc);
1013                 return -ENOMEM;
1014         }
1015         rxq->iovecs = iovecs;
1016
1017         dev->data->rx_queues[rx_queue_id] = rxq;
1018         fd = tap_setup_queue(dev, internals, rx_queue_id, 1);
1019         if (fd == -1) {
1020                 ret = fd;
1021                 goto error;
1022         }
1023
1024         (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
1025         (*rxq->iovecs)[0].iov_base = &rxq->pi;
1026
1027         for (i = 1; i <= nb_desc; i++) {
1028                 *tmp = rte_pktmbuf_alloc(rxq->mp);
1029                 if (!*tmp) {
1030                         RTE_LOG(WARNING, PMD,
1031                                 "%s: couldn't allocate memory for queue %d\n",
1032                                 dev->device->name, rx_queue_id);
1033                         ret = -ENOMEM;
1034                         goto error;
1035                 }
1036                 (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off;
1037                 (*rxq->iovecs)[i].iov_base =
1038                         (char *)(*tmp)->buf_addr + data_off;
1039                 data_off = 0;
1040                 tmp = &(*tmp)->next;
1041         }
1042
1043         RTE_LOG(DEBUG, PMD, "  RX TAP device name %s, qid %d on fd %d\n",
1044                 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
1045
1046         return 0;
1047
1048 error:
1049         rte_pktmbuf_free(rxq->pool);
1050         rxq->pool = NULL;
1051         rte_free(rxq->iovecs);
1052         rxq->iovecs = NULL;
1053         return ret;
1054 }
1055
1056 static int
1057 tap_tx_queue_setup(struct rte_eth_dev *dev,
1058                    uint16_t tx_queue_id,
1059                    uint16_t nb_tx_desc __rte_unused,
1060                    unsigned int socket_id __rte_unused,
1061                    const struct rte_eth_txconf *tx_conf __rte_unused)
1062 {
1063         struct pmd_internals *internals = dev->data->dev_private;
1064         int ret;
1065
1066         if (tx_queue_id >= dev->data->nb_tx_queues)
1067                 return -1;
1068
1069         dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
1070         ret = tap_setup_queue(dev, internals, tx_queue_id, 0);
1071         if (ret == -1)
1072                 return -1;
1073
1074         RTE_LOG(DEBUG, PMD, "  TX TAP device name %s, qid %d on fd %d\n",
1075                 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
1076
1077         return 0;
1078 }
1079
1080 static int
1081 tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
1082 {
1083         struct pmd_internals *pmd = dev->data->dev_private;
1084         struct ifreq ifr = { .ifr_mtu = mtu };
1085         int err = 0;
1086
1087         err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE);
1088         if (!err)
1089                 dev->data->mtu = mtu;
1090
1091         return err;
1092 }
1093
1094 static int
1095 tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
1096                      struct ether_addr *mc_addr_set __rte_unused,
1097                      uint32_t nb_mc_addr __rte_unused)
1098 {
1099         /*
1100          * Nothing to do actually: the tap has no filtering whatsoever, every
1101          * packet is received.
1102          */
1103         return 0;
1104 }
1105
1106 static int
1107 tap_nl_msg_handler(struct nlmsghdr *nh, void *arg)
1108 {
1109         struct rte_eth_dev *dev = arg;
1110         struct pmd_internals *pmd = dev->data->dev_private;
1111         struct ifinfomsg *info = NLMSG_DATA(nh);
1112
1113         if (nh->nlmsg_type != RTM_NEWLINK ||
1114             (info->ifi_index != pmd->if_index &&
1115              info->ifi_index != pmd->remote_if_index))
1116                 return 0;
1117         return tap_link_update(dev, 0);
1118 }
1119
1120 static void
1121 tap_dev_intr_handler(void *cb_arg)
1122 {
1123         struct rte_eth_dev *dev = cb_arg;
1124         struct pmd_internals *pmd = dev->data->dev_private;
1125
1126         nl_recv(pmd->intr_handle.fd, tap_nl_msg_handler, dev);
1127 }
1128
1129 static int
1130 tap_intr_handle_set(struct rte_eth_dev *dev, int set)
1131 {
1132         struct pmd_internals *pmd = dev->data->dev_private;
1133
1134         /* In any case, disable interrupt if the conf is no longer there. */
1135         if (!dev->data->dev_conf.intr_conf.lsc) {
1136                 if (pmd->intr_handle.fd != -1) {
1137                         nl_final(pmd->intr_handle.fd);
1138                         rte_intr_callback_unregister(&pmd->intr_handle,
1139                                 tap_dev_intr_handler, dev);
1140                 }
1141                 return 0;
1142         }
1143         if (set) {
1144                 pmd->intr_handle.fd = nl_init(RTMGRP_LINK);
1145                 if (unlikely(pmd->intr_handle.fd == -1))
1146                         return -EBADF;
1147                 return rte_intr_callback_register(
1148                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1149         }
1150         nl_final(pmd->intr_handle.fd);
1151         return rte_intr_callback_unregister(&pmd->intr_handle,
1152                                             tap_dev_intr_handler, dev);
1153 }
1154
1155 static const uint32_t*
1156 tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused)
1157 {
1158         static const uint32_t ptypes[] = {
1159                 RTE_PTYPE_INNER_L2_ETHER,
1160                 RTE_PTYPE_INNER_L2_ETHER_VLAN,
1161                 RTE_PTYPE_INNER_L2_ETHER_QINQ,
1162                 RTE_PTYPE_INNER_L3_IPV4,
1163                 RTE_PTYPE_INNER_L3_IPV4_EXT,
1164                 RTE_PTYPE_INNER_L3_IPV6,
1165                 RTE_PTYPE_INNER_L3_IPV6_EXT,
1166                 RTE_PTYPE_INNER_L4_FRAG,
1167                 RTE_PTYPE_INNER_L4_UDP,
1168                 RTE_PTYPE_INNER_L4_TCP,
1169                 RTE_PTYPE_INNER_L4_SCTP,
1170                 RTE_PTYPE_L2_ETHER,
1171                 RTE_PTYPE_L2_ETHER_VLAN,
1172                 RTE_PTYPE_L2_ETHER_QINQ,
1173                 RTE_PTYPE_L3_IPV4,
1174                 RTE_PTYPE_L3_IPV4_EXT,
1175                 RTE_PTYPE_L3_IPV6_EXT,
1176                 RTE_PTYPE_L3_IPV6,
1177                 RTE_PTYPE_L4_FRAG,
1178                 RTE_PTYPE_L4_UDP,
1179                 RTE_PTYPE_L4_TCP,
1180                 RTE_PTYPE_L4_SCTP,
1181         };
1182
1183         return ptypes;
1184 }
1185
1186 static int
1187 tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused,
1188                   struct rte_eth_fc_conf *fc_conf)
1189 {
1190         fc_conf->mode = RTE_FC_NONE;
1191         return 0;
1192 }
1193
1194 static int
1195 tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused,
1196                   struct rte_eth_fc_conf *fc_conf)
1197 {
1198         if (fc_conf->mode != RTE_FC_NONE)
1199                 return -ENOTSUP;
1200         return 0;
1201 }
1202
1203 static const struct eth_dev_ops ops = {
1204         .dev_start              = tap_dev_start,
1205         .dev_stop               = tap_dev_stop,
1206         .dev_close              = tap_dev_close,
1207         .dev_configure          = tap_dev_configure,
1208         .dev_infos_get          = tap_dev_info,
1209         .rx_queue_setup         = tap_rx_queue_setup,
1210         .tx_queue_setup         = tap_tx_queue_setup,
1211         .rx_queue_release       = tap_rx_queue_release,
1212         .tx_queue_release       = tap_tx_queue_release,
1213         .flow_ctrl_get          = tap_flow_ctrl_get,
1214         .flow_ctrl_set          = tap_flow_ctrl_set,
1215         .link_update            = tap_link_update,
1216         .dev_set_link_up        = tap_link_set_up,
1217         .dev_set_link_down      = tap_link_set_down,
1218         .promiscuous_enable     = tap_promisc_enable,
1219         .promiscuous_disable    = tap_promisc_disable,
1220         .allmulticast_enable    = tap_allmulti_enable,
1221         .allmulticast_disable   = tap_allmulti_disable,
1222         .mac_addr_set           = tap_mac_set,
1223         .mtu_set                = tap_mtu_set,
1224         .set_mc_addr_list       = tap_set_mc_addr_list,
1225         .stats_get              = tap_stats_get,
1226         .stats_reset            = tap_stats_reset,
1227         .dev_supported_ptypes_get = tap_dev_supported_ptypes_get,
1228         .filter_ctrl            = tap_dev_filter_ctrl,
1229 };
1230
1231 static int
1232 eth_dev_tap_create(struct rte_vdev_device *vdev, char *tap_name,
1233                    char *remote_iface, int fixed_mac_type)
1234 {
1235         int numa_node = rte_socket_id();
1236         struct rte_eth_dev *dev;
1237         struct pmd_internals *pmd;
1238         struct rte_eth_dev_data *data;
1239         struct ifreq ifr;
1240         int i;
1241
1242         RTE_LOG(DEBUG, PMD, "  TAP device on numa %u\n", rte_socket_id());
1243
1244         data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node);
1245         if (!data) {
1246                 RTE_LOG(ERR, PMD, "TAP Failed to allocate data\n");
1247                 goto error_exit;
1248         }
1249
1250         dev = rte_eth_vdev_allocate(vdev, sizeof(*pmd));
1251         if (!dev) {
1252                 RTE_LOG(ERR, PMD, "TAP Unable to allocate device struct\n");
1253                 goto error_exit;
1254         }
1255
1256         pmd = dev->data->dev_private;
1257         pmd->dev = dev;
1258         snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
1259
1260         pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
1261         if (pmd->ioctl_sock == -1) {
1262                 RTE_LOG(ERR, PMD,
1263                         "TAP Unable to get a socket for management: %s\n",
1264                         strerror(errno));
1265                 goto error_exit;
1266         }
1267
1268         /* Setup some default values */
1269         rte_memcpy(data, dev->data, sizeof(*data));
1270         data->dev_private = pmd;
1271         data->dev_flags = RTE_ETH_DEV_INTR_LSC;
1272         data->numa_node = numa_node;
1273
1274         data->dev_link = pmd_link;
1275         data->mac_addrs = &pmd->eth_addr;
1276         /* Set the number of RX and TX queues */
1277         data->nb_rx_queues = 0;
1278         data->nb_tx_queues = 0;
1279
1280         dev->data = data;
1281         dev->dev_ops = &ops;
1282         dev->rx_pkt_burst = pmd_rx_burst;
1283         dev->tx_pkt_burst = pmd_tx_burst;
1284
1285         pmd->intr_handle.type = RTE_INTR_HANDLE_EXT;
1286         pmd->intr_handle.fd = -1;
1287
1288         /* Presetup the fds to -1 as being not valid */
1289         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1290                 pmd->rxq[i].fd = -1;
1291                 pmd->txq[i].fd = -1;
1292         }
1293
1294         if (fixed_mac_type) {
1295                 /* fixed mac = 00:64:74:61:70:<iface_idx> */
1296                 static int iface_idx;
1297                 char mac[ETHER_ADDR_LEN] = "\0dtap";
1298
1299                 mac[ETHER_ADDR_LEN - 1] = iface_idx++;
1300                 rte_memcpy(&pmd->eth_addr, mac, ETHER_ADDR_LEN);
1301         } else {
1302                 eth_random_addr((uint8_t *)&pmd->eth_addr);
1303         }
1304
1305         /* Immediately create the netdevice (this will create the 1st queue). */
1306         /* rx queue */
1307         if (tap_setup_queue(dev, pmd, 0, 1) == -1)
1308                 goto error_exit;
1309         /* tx queue */
1310         if (tap_setup_queue(dev, pmd, 0, 0) == -1)
1311                 goto error_exit;
1312
1313         ifr.ifr_mtu = dev->data->mtu;
1314         if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE) < 0)
1315                 goto error_exit;
1316
1317         memset(&ifr, 0, sizeof(struct ifreq));
1318         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
1319         rte_memcpy(ifr.ifr_hwaddr.sa_data, &pmd->eth_addr, ETHER_ADDR_LEN);
1320         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
1321                 goto error_exit;
1322
1323         /*
1324          * Set up everything related to rte_flow:
1325          * - netlink socket
1326          * - tap / remote if_index
1327          * - mandatory QDISCs
1328          * - rte_flow actual/implicit lists
1329          * - implicit rules
1330          */
1331         pmd->nlsk_fd = nl_init(0);
1332         if (pmd->nlsk_fd == -1) {
1333                 RTE_LOG(WARNING, PMD, "%s: failed to create netlink socket.\n",
1334                         pmd->name);
1335                 goto disable_rte_flow;
1336         }
1337         pmd->if_index = if_nametoindex(pmd->name);
1338         if (!pmd->if_index) {
1339                 RTE_LOG(ERR, PMD, "%s: failed to get if_index.\n", pmd->name);
1340                 goto disable_rte_flow;
1341         }
1342         if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) {
1343                 RTE_LOG(ERR, PMD, "%s: failed to create multiq qdisc.\n",
1344                         pmd->name);
1345                 goto disable_rte_flow;
1346         }
1347         if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) {
1348                 RTE_LOG(ERR, PMD, "%s: failed to create ingress qdisc.\n",
1349                         pmd->name);
1350                 goto disable_rte_flow;
1351         }
1352         LIST_INIT(&pmd->flows);
1353
1354         if (strlen(remote_iface)) {
1355                 pmd->remote_if_index = if_nametoindex(remote_iface);
1356                 if (!pmd->remote_if_index) {
1357                         RTE_LOG(ERR, PMD, "%s: failed to get %s if_index.\n",
1358                                 pmd->name, remote_iface);
1359                         goto error_remote;
1360                 }
1361                 snprintf(pmd->remote_iface, RTE_ETH_NAME_MAX_LEN,
1362                          "%s", remote_iface);
1363
1364                 /* Save state of remote device */
1365                 tap_ioctl(pmd, SIOCGIFFLAGS, &pmd->remote_initial_flags, 0, REMOTE_ONLY);
1366
1367                 /* Replicate remote MAC address */
1368                 if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0) {
1369                         RTE_LOG(ERR, PMD, "%s: failed to get %s MAC address.\n",
1370                                 pmd->name, pmd->remote_iface);
1371                         goto error_remote;
1372                 }
1373                 rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data,
1374                            ETHER_ADDR_LEN);
1375                 /* The desired MAC is already in ifreq after SIOCGIFHWADDR. */
1376                 if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0) {
1377                         RTE_LOG(ERR, PMD, "%s: failed to get %s MAC address.\n",
1378                                 pmd->name, remote_iface);
1379                         goto error_remote;
1380                 }
1381
1382                 /*
1383                  * Flush usually returns negative value because it tries to
1384                  * delete every QDISC (and on a running device, one QDISC at
1385                  * least is needed). Ignore negative return value.
1386                  */
1387                 qdisc_flush(pmd->nlsk_fd, pmd->remote_if_index);
1388                 if (qdisc_create_ingress(pmd->nlsk_fd,
1389                                          pmd->remote_if_index) < 0) {
1390                         RTE_LOG(ERR, PMD, "%s: failed to create ingress qdisc.\n",
1391                                 pmd->remote_iface);
1392                         goto error_remote;
1393                 }
1394                 LIST_INIT(&pmd->implicit_flows);
1395                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_TX) < 0 ||
1396                     tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0 ||
1397                     tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCAST) < 0 ||
1398                     tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCASTV6) < 0) {
1399                         RTE_LOG(ERR, PMD,
1400                                 "%s: failed to create implicit rules.\n",
1401                                 pmd->name);
1402                         goto error_remote;
1403                 }
1404         }
1405
1406         return 0;
1407
1408 disable_rte_flow:
1409         RTE_LOG(ERR, PMD, " Disabling rte flow support: %s(%d)\n",
1410                 strerror(errno), errno);
1411         if (strlen(remote_iface)) {
1412                 RTE_LOG(ERR, PMD, "Remote feature requires flow support.\n");
1413                 goto error_exit;
1414         }
1415         return 0;
1416
1417 error_remote:
1418         RTE_LOG(ERR, PMD, " Can't set up remote feature: %s(%d)\n",
1419                 strerror(errno), errno);
1420         tap_flow_implicit_flush(pmd, NULL);
1421
1422 error_exit:
1423         RTE_LOG(ERR, PMD, "TAP Unable to initialize %s\n",
1424                 rte_vdev_device_name(vdev));
1425
1426         rte_free(data);
1427         return -EINVAL;
1428 }
1429
1430 static int
1431 set_interface_name(const char *key __rte_unused,
1432                    const char *value,
1433                    void *extra_args)
1434 {
1435         char *name = (char *)extra_args;
1436
1437         if (value)
1438                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
1439         else
1440                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
1441                          DEFAULT_TAP_NAME, (tap_unit - 1));
1442
1443         return 0;
1444 }
1445
1446 static int
1447 set_interface_speed(const char *key __rte_unused,
1448                     const char *value,
1449                     void *extra_args)
1450 {
1451         *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G;
1452
1453         return 0;
1454 }
1455
1456 static int
1457 set_remote_iface(const char *key __rte_unused,
1458                  const char *value,
1459                  void *extra_args)
1460 {
1461         char *name = (char *)extra_args;
1462
1463         if (value)
1464                 snprintf(name, RTE_ETH_NAME_MAX_LEN, "%s", value);
1465
1466         return 0;
1467 }
1468
1469 static int
1470 set_mac_type(const char *key __rte_unused,
1471              const char *value,
1472              void *extra_args)
1473 {
1474         if (value &&
1475             !strncasecmp(ETH_TAP_MAC_FIXED, value, strlen(ETH_TAP_MAC_FIXED)))
1476                 *(int *)extra_args = 1;
1477         return 0;
1478 }
1479
1480 /* Open a TAP interface device.
1481  */
1482 static int
1483 rte_pmd_tap_probe(struct rte_vdev_device *dev)
1484 {
1485         const char *name, *params;
1486         int ret;
1487         struct rte_kvargs *kvlist = NULL;
1488         int speed;
1489         char tap_name[RTE_ETH_NAME_MAX_LEN];
1490         char remote_iface[RTE_ETH_NAME_MAX_LEN];
1491         int fixed_mac_type = 0;
1492
1493         name = rte_vdev_device_name(dev);
1494         params = rte_vdev_device_args(dev);
1495
1496         speed = ETH_SPEED_NUM_10G;
1497         snprintf(tap_name, sizeof(tap_name), "%s%d",
1498                  DEFAULT_TAP_NAME, tap_unit++);
1499         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
1500
1501         if (params && (params[0] != '\0')) {
1502                 RTE_LOG(DEBUG, PMD, "parameters (%s)\n", params);
1503
1504                 kvlist = rte_kvargs_parse(params, valid_arguments);
1505                 if (kvlist) {
1506                         if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) {
1507                                 ret = rte_kvargs_process(kvlist,
1508                                                          ETH_TAP_SPEED_ARG,
1509                                                          &set_interface_speed,
1510                                                          &speed);
1511                                 if (ret == -1)
1512                                         goto leave;
1513                         }
1514
1515                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
1516                                 ret = rte_kvargs_process(kvlist,
1517                                                          ETH_TAP_IFACE_ARG,
1518                                                          &set_interface_name,
1519                                                          tap_name);
1520                                 if (ret == -1)
1521                                         goto leave;
1522                         }
1523
1524                         if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) {
1525                                 ret = rte_kvargs_process(kvlist,
1526                                                          ETH_TAP_REMOTE_ARG,
1527                                                          &set_remote_iface,
1528                                                          remote_iface);
1529                                 if (ret == -1)
1530                                         goto leave;
1531                         }
1532
1533                         if (rte_kvargs_count(kvlist, ETH_TAP_MAC_ARG) == 1) {
1534                                 ret = rte_kvargs_process(kvlist,
1535                                                          ETH_TAP_MAC_ARG,
1536                                                          &set_mac_type,
1537                                                          &fixed_mac_type);
1538                                 if (ret == -1)
1539                                         goto leave;
1540                         }
1541                 }
1542         }
1543         pmd_link.link_speed = speed;
1544
1545         RTE_LOG(NOTICE, PMD, "Initializing pmd_tap for %s as %s\n",
1546                 name, tap_name);
1547
1548         ret = eth_dev_tap_create(dev, tap_name, remote_iface, fixed_mac_type);
1549
1550 leave:
1551         if (ret == -1) {
1552                 RTE_LOG(ERR, PMD, "Failed to create pmd for %s as %s\n",
1553                         name, tap_name);
1554                 tap_unit--;             /* Restore the unit number */
1555         }
1556         rte_kvargs_free(kvlist);
1557
1558         return ret;
1559 }
1560
1561 /* detach a TAP device.
1562  */
1563 static int
1564 rte_pmd_tap_remove(struct rte_vdev_device *dev)
1565 {
1566         struct rte_eth_dev *eth_dev = NULL;
1567         struct pmd_internals *internals;
1568         int i;
1569
1570         RTE_LOG(DEBUG, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
1571                 rte_socket_id());
1572
1573         /* find the ethdev entry */
1574         eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
1575         if (!eth_dev)
1576                 return 0;
1577
1578         internals = eth_dev->data->dev_private;
1579         if (internals->nlsk_fd) {
1580                 tap_flow_flush(eth_dev, NULL);
1581                 tap_flow_implicit_flush(internals, NULL);
1582                 nl_final(internals->nlsk_fd);
1583         }
1584         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1585                 if (internals->rxq[i].fd != -1) {
1586                         close(internals->rxq[i].fd);
1587                         internals->rxq[i].fd = -1;
1588                 }
1589                 if (internals->txq[i].fd != -1) {
1590                         close(internals->txq[i].fd);
1591                         internals->txq[i].fd = -1;
1592                 }
1593         }
1594
1595         close(internals->ioctl_sock);
1596         rte_free(eth_dev->data->dev_private);
1597         rte_free(eth_dev->data);
1598
1599         rte_eth_dev_release_port(eth_dev);
1600
1601         return 0;
1602 }
1603
1604 static struct rte_vdev_driver pmd_tap_drv = {
1605         .probe = rte_pmd_tap_probe,
1606         .remove = rte_pmd_tap_remove,
1607 };
1608 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
1609 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
1610 RTE_PMD_REGISTER_PARAM_STRING(net_tap,
1611                               ETH_TAP_IFACE_ARG "=<string> "
1612                               ETH_TAP_SPEED_ARG "=<int> "
1613                               ETH_TAP_MAC_ARG "=" ETH_TAP_MAC_FIXED " "
1614                               ETH_TAP_REMOTE_ARG "=<string>");