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_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 void
 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 }
 732
 733 static void
 734 tap_stats_reset(struct rte_eth_dev *dev)
 735 {
 736         int i;
 737         struct pmd_internals *pmd = dev->data->dev_private;
 738
 739         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 740                 pmd->rxq[i].stats.ipackets = 0;
 741                 pmd->rxq[i].stats.ibytes = 0;
 742                 pmd->rxq[i].stats.ierrors = 0;
 743                 pmd->rxq[i].stats.rx_nombuf = 0;
 744
 745                 pmd->txq[i].stats.opackets = 0;
 746                 pmd->txq[i].stats.errs = 0;
 747                 pmd->txq[i].stats.obytes = 0;
 748         }
 749 }
 750
 751 static void
 752 tap_dev_close(struct rte_eth_dev *dev)
 753 {
 754         int i;
 755         struct pmd_internals *internals = dev->data->dev_private;
 756
 757         tap_link_set_down(dev);
 758         tap_flow_flush(dev, NULL);
 759         tap_flow_implicit_flush(internals, NULL);
 760
 761         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 762                 if (internals->rxq[i].fd != -1) {
 763                         close(internals->rxq[i].fd);
 764                         internals->rxq[i].fd = -1;
 765                 }
 766                 if (internals->txq[i].fd != -1) {
 767                         close(internals->txq[i].fd);
 768                         internals->txq[i].fd = -1;
 769                 }
 770         }
 771
 772         if (internals->remote_if_index) {
 773                 /* Restore initial remote state */
 774                 ioctl(internals->ioctl_sock, SIOCSIFFLAGS,
 775                                 &internals->remote_initial_flags);
 776         }
 777 }
 778
 779 static void
 780 tap_rx_queue_release(void *queue)
 781 {
 782         struct rx_queue *rxq = queue;
 783
 784         if (rxq && (rxq->fd > 0)) {
 785                 close(rxq->fd);
 786                 rxq->fd = -1;
 787                 rte_pktmbuf_free(rxq->pool);
 788                 rte_free(rxq->iovecs);
 789                 rxq->pool = NULL;
 790                 rxq->iovecs = NULL;
 791         }
 792 }
 793
 794 static void
 795 tap_tx_queue_release(void *queue)
 796 {
 797         struct tx_queue *txq = queue;
 798
 799         if (txq && (txq->fd > 0)) {
 800                 close(txq->fd);
 801                 txq->fd = -1;
 802         }
 803 }
 804
 805 static int
 806 tap_link_update(struct rte_eth_dev *dev, int wait_to_complete __rte_unused)
 807 {
 808         struct rte_eth_link *dev_link = &dev->data->dev_link;
 809         struct pmd_internals *pmd = dev->data->dev_private;
 810         struct ifreq ifr = { .ifr_flags = 0 };
 811
 812         if (pmd->remote_if_index) {
 813                 tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, REMOTE_ONLY);
 814                 if (!(ifr.ifr_flags & IFF_UP) ||
 815                     !(ifr.ifr_flags & IFF_RUNNING)) {
 816                         dev_link->link_status = ETH_LINK_DOWN;
 817                         return 0;
 818                 }
 819         }
 820         tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, LOCAL_ONLY);
 821         dev_link->link_status =
 822                 ((ifr.ifr_flags & IFF_UP) && (ifr.ifr_flags & IFF_RUNNING) ?
 823                  ETH_LINK_UP :
 824                  ETH_LINK_DOWN);
 825         return 0;
 826 }
 827
 828 static void
 829 tap_promisc_enable(struct rte_eth_dev *dev)
 830 {
 831         struct pmd_internals *pmd = dev->data->dev_private;
 832         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 833
 834         dev->data->promiscuous = 1;
 835         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 836         if (pmd->remote_if_index && !pmd->flow_isolate)
 837                 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC);
 838 }
 839
 840 static void
 841 tap_promisc_disable(struct rte_eth_dev *dev)
 842 {
 843         struct pmd_internals *pmd = dev->data->dev_private;
 844         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 845
 846         dev->data->promiscuous = 0;
 847         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 848         if (pmd->remote_if_index && !pmd->flow_isolate)
 849                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC);
 850 }
 851
 852 static void
 853 tap_allmulti_enable(struct rte_eth_dev *dev)
 854 {
 855         struct pmd_internals *pmd = dev->data->dev_private;
 856         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 857
 858         dev->data->all_multicast = 1;
 859         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 860         if (pmd->remote_if_index && !pmd->flow_isolate)
 861                 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI);
 862 }
 863
 864 static void
 865 tap_allmulti_disable(struct rte_eth_dev *dev)
 866 {
 867         struct pmd_internals *pmd = dev->data->dev_private;
 868         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 869
 870         dev->data->all_multicast = 0;
 871         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 872         if (pmd->remote_if_index && !pmd->flow_isolate)
 873                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI);
 874 }
 875
 876 static void
 877 tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
 878 {
 879         struct pmd_internals *pmd = dev->data->dev_private;
 880         enum ioctl_mode mode = LOCAL_ONLY;
 881         struct ifreq ifr;
 882
 883         if (is_zero_ether_addr(mac_addr)) {
 884                 RTE_LOG(ERR, PMD, "%s: can't set an empty MAC address\n",
 885                         dev->device->name);
 886                 return;
 887         }
 888         /* Check the actual current MAC address on the tap netdevice */
 889         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
 890                 return;
 891         if (is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 892                                mac_addr))
 893                 return;
 894         /* Check the current MAC address on the remote */
 895         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0)
 896                 return;
 897         if (!is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 898                                mac_addr))
 899                 mode = LOCAL_AND_REMOTE;
 900         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
 901         rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETHER_ADDR_LEN);
 902         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1, mode) < 0)
 903                 return;
 904         rte_memcpy(&pmd->eth_addr, mac_addr, ETHER_ADDR_LEN);
 905         if (pmd->remote_if_index && !pmd->flow_isolate) {
 906                 /* Replace MAC redirection rule after a MAC change */
 907                 if (tap_flow_implicit_destroy(pmd, TAP_REMOTE_LOCAL_MAC) < 0) {
 908                         RTE_LOG(ERR, PMD,
 909                                 "%s: Couldn't delete MAC redirection rule\n",
 910                                 dev->device->name);
 911                         return;
 912                 }
 913                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0)
 914                         RTE_LOG(ERR, PMD,
 915                                 "%s: Couldn't add MAC redirection rule\n",
 916                                 dev->device->name);
 917         }
 918 }
 919
 920 static int
 921 tap_setup_queue(struct rte_eth_dev *dev,
 922                 struct pmd_internals *internals,
 923                 uint16_t qid,
 924                 int is_rx)
 925 {
 926         int *fd;
 927         int *other_fd;
 928         const char *dir;
 929         struct pmd_internals *pmd = dev->data->dev_private;
 930         struct rx_queue *rx = &internals->rxq[qid];
 931         struct tx_queue *tx = &internals->txq[qid];
 932
 933         if (is_rx) {
 934                 fd = &rx->fd;
 935                 other_fd = &tx->fd;
 936                 dir = "rx";
 937         } else {
 938                 fd = &tx->fd;
 939                 other_fd = &rx->fd;
 940                 dir = "tx";
 941         }
 942         if (*fd != -1) {
 943                 /* fd for this queue already exists */
 944                 RTE_LOG(DEBUG, PMD, "%s: fd %d for %s queue qid %d exists\n",
 945                         pmd->name, *fd, dir, qid);
 946         } else if (*other_fd != -1) {
 947                 /* Only other_fd exists. dup it */
 948                 *fd = dup(*other_fd);
 949                 if (*fd < 0) {
 950                         *fd = -1;
 951                         RTE_LOG(ERR, PMD, "%s: dup() failed.\n",
 952                                 pmd->name);
 953                         return -1;
 954                 }
 955                 RTE_LOG(DEBUG, PMD, "%s: dup fd %d for %s queue qid %d (%d)\n",
 956                         pmd->name, *other_fd, dir, qid, *fd);
 957         } else {
 958                 /* Both RX and TX fds do not exist (equal -1). Create fd */
 959                 *fd = tun_alloc(pmd);
 960                 if (*fd < 0) {
 961                         *fd = -1; /* restore original value */
 962                         RTE_LOG(ERR, PMD, "%s: tun_alloc() failed.\n",
 963                                 pmd->name);
 964                         return -1;
 965                 }
 966                 RTE_LOG(DEBUG, PMD, "%s: add %s queue for qid %d fd %d\n",
 967                         pmd->name, dir, qid, *fd);
 968         }
 969
 970         tx->mtu = &dev->data->mtu;
 971         rx->rxmode = &dev->data->dev_conf.rxmode;
 972
 973         return *fd;
 974 }
 975
 976 static int
 977 tap_rx_queue_setup(struct rte_eth_dev *dev,
 978                    uint16_t rx_queue_id,
 979                    uint16_t nb_rx_desc,
 980                    unsigned int socket_id,
 981                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 982                    struct rte_mempool *mp)
 983 {
 984         struct pmd_internals *internals = dev->data->dev_private;
 985         struct rx_queue *rxq = &internals->rxq[rx_queue_id];
 986         struct rte_mbuf **tmp = &rxq->pool;
 987         long iov_max = sysconf(_SC_IOV_MAX);
 988         uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
 989         struct iovec (*iovecs)[nb_desc + 1];
 990         int data_off = RTE_PKTMBUF_HEADROOM;
 991         int ret = 0;
 992         int fd;
 993         int i;
 994
 995         if (rx_queue_id >= dev->data->nb_rx_queues || !mp) {
 996                 RTE_LOG(WARNING, PMD,
 997                         "nb_rx_queues %d too small or mempool NULL\n",
 998                         dev->data->nb_rx_queues);
 999                 return -1;
1000         }
1001
1002         rxq->mp = mp;
1003         rxq->trigger_seen = 1; /* force initial burst */
1004         rxq->in_port = dev->data->port_id;
1005         rxq->nb_rx_desc = nb_desc;
1006         iovecs = rte_zmalloc_socket(dev->device->name, sizeof(*iovecs), 0,
1007                                     socket_id);
1008         if (!iovecs) {
1009                 RTE_LOG(WARNING, PMD,
1010                         "%s: Couldn't allocate %d RX descriptors\n",
1011                         dev->device->name, nb_desc);
1012                 return -ENOMEM;
1013         }
1014         rxq->iovecs = iovecs;
1015
1016         dev->data->rx_queues[rx_queue_id] = rxq;
1017         fd = tap_setup_queue(dev, internals, rx_queue_id, 1);
1018         if (fd == -1) {
1019                 ret = fd;
1020                 goto error;
1021         }
1022
1023         (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
1024         (*rxq->iovecs)[0].iov_base = &rxq->pi;
1025
1026         for (i = 1; i <= nb_desc; i++) {
1027                 *tmp = rte_pktmbuf_alloc(rxq->mp);
1028                 if (!*tmp) {
1029                         RTE_LOG(WARNING, PMD,
1030                                 "%s: couldn't allocate memory for queue %d\n",
1031                                 dev->device->name, rx_queue_id);
1032                         ret = -ENOMEM;
1033                         goto error;
1034                 }
1035                 (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off;
1036                 (*rxq->iovecs)[i].iov_base =
1037                         (char *)(*tmp)->buf_addr + data_off;
1038                 data_off = 0;
1039                 tmp = &(*tmp)->next;
1040         }
1041
1042         RTE_LOG(DEBUG, PMD, "  RX TAP device name %s, qid %d on fd %d\n",
1043                 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
1044
1045         return 0;
1046
1047 error:
1048         rte_pktmbuf_free(rxq->pool);
1049         rxq->pool = NULL;
1050         rte_free(rxq->iovecs);
1051         rxq->iovecs = NULL;
1052         return ret;
1053 }
1054
1055 static int
1056 tap_tx_queue_setup(struct rte_eth_dev *dev,
1057                    uint16_t tx_queue_id,
1058                    uint16_t nb_tx_desc __rte_unused,
1059                    unsigned int socket_id __rte_unused,
1060                    const struct rte_eth_txconf *tx_conf __rte_unused)
1061 {
1062         struct pmd_internals *internals = dev->data->dev_private;
1063         int ret;
1064
1065         if (tx_queue_id >= dev->data->nb_tx_queues)
1066                 return -1;
1067
1068         dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
1069         ret = tap_setup_queue(dev, internals, tx_queue_id, 0);
1070         if (ret == -1)
1071                 return -1;
1072
1073         RTE_LOG(DEBUG, PMD, "  TX TAP device name %s, qid %d on fd %d\n",
1074                 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
1075
1076         return 0;
1077 }
1078
1079 static int
1080 tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
1081 {
1082         struct pmd_internals *pmd = dev->data->dev_private;
1083         struct ifreq ifr = { .ifr_mtu = mtu };
1084         int err = 0;
1085
1086         err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE);
1087         if (!err)
1088                 dev->data->mtu = mtu;
1089
1090         return err;
1091 }
1092
1093 static int
1094 tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
1095                      struct ether_addr *mc_addr_set __rte_unused,
1096                      uint32_t nb_mc_addr __rte_unused)
1097 {
1098         /*
1099          * Nothing to do actually: the tap has no filtering whatsoever, every
1100          * packet is received.
1101          */
1102         return 0;
1103 }
1104
1105 static int
1106 tap_nl_msg_handler(struct nlmsghdr *nh, void *arg)
1107 {
1108         struct rte_eth_dev *dev = arg;
1109         struct pmd_internals *pmd = dev->data->dev_private;
1110         struct ifinfomsg *info = NLMSG_DATA(nh);
1111
1112         if (nh->nlmsg_type != RTM_NEWLINK ||
1113             (info->ifi_index != pmd->if_index &&
1114              info->ifi_index != pmd->remote_if_index))
1115                 return 0;
1116         return tap_link_update(dev, 0);
1117 }
1118
1119 static void
1120 tap_dev_intr_handler(void *cb_arg)
1121 {
1122         struct rte_eth_dev *dev = cb_arg;
1123         struct pmd_internals *pmd = dev->data->dev_private;
1124
1125         nl_recv(pmd->intr_handle.fd, tap_nl_msg_handler, dev);
1126 }
1127
1128 static int
1129 tap_intr_handle_set(struct rte_eth_dev *dev, int set)
1130 {
1131         struct pmd_internals *pmd = dev->data->dev_private;
1132
1133         /* In any case, disable interrupt if the conf is no longer there. */
1134         if (!dev->data->dev_conf.intr_conf.lsc) {
1135                 if (pmd->intr_handle.fd != -1)
1136                         nl_final(pmd->intr_handle.fd);
1137                 rte_intr_callback_unregister(
1138                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1139                 return 0;
1140         }
1141         if (set) {
1142                 pmd->intr_handle.fd = nl_init(RTMGRP_LINK);
1143                 if (unlikely(pmd->intr_handle.fd == -1))
1144                         return -EBADF;
1145                 return rte_intr_callback_register(
1146                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1147         }
1148         nl_final(pmd->intr_handle.fd);
1149         return rte_intr_callback_unregister(&pmd->intr_handle,
1150                                             tap_dev_intr_handler, dev);
1151 }
1152
1153 static const uint32_t*
1154 tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused)
1155 {
1156         static const uint32_t ptypes[] = {
1157                 RTE_PTYPE_INNER_L2_ETHER,
1158                 RTE_PTYPE_INNER_L2_ETHER_VLAN,
1159                 RTE_PTYPE_INNER_L2_ETHER_QINQ,
1160                 RTE_PTYPE_INNER_L3_IPV4,
1161                 RTE_PTYPE_INNER_L3_IPV4_EXT,
1162                 RTE_PTYPE_INNER_L3_IPV6,
1163                 RTE_PTYPE_INNER_L3_IPV6_EXT,
1164                 RTE_PTYPE_INNER_L4_FRAG,
1165                 RTE_PTYPE_INNER_L4_UDP,
1166                 RTE_PTYPE_INNER_L4_TCP,
1167                 RTE_PTYPE_INNER_L4_SCTP,
1168                 RTE_PTYPE_L2_ETHER,
1169                 RTE_PTYPE_L2_ETHER_VLAN,
1170                 RTE_PTYPE_L2_ETHER_QINQ,
1171                 RTE_PTYPE_L3_IPV4,
1172                 RTE_PTYPE_L3_IPV4_EXT,
1173                 RTE_PTYPE_L3_IPV6_EXT,
1174                 RTE_PTYPE_L3_IPV6,
1175                 RTE_PTYPE_L4_FRAG,
1176                 RTE_PTYPE_L4_UDP,
1177                 RTE_PTYPE_L4_TCP,
1178                 RTE_PTYPE_L4_SCTP,
1179         };
1180
1181         return ptypes;
1182 }
1183
1184 static int
1185 tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused,
1186                   struct rte_eth_fc_conf *fc_conf)
1187 {
1188         fc_conf->mode = RTE_FC_NONE;
1189         return 0;
1190 }
1191
1192 static int
1193 tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused,
1194                   struct rte_eth_fc_conf *fc_conf)
1195 {
1196         if (fc_conf->mode != RTE_FC_NONE)
1197                 return -ENOTSUP;
1198         return 0;
1199 }
1200
1201 static const struct eth_dev_ops ops = {
1202         .dev_start              = tap_dev_start,
1203         .dev_stop               = tap_dev_stop,
1204         .dev_close              = tap_dev_close,
1205         .dev_configure          = tap_dev_configure,
1206         .dev_infos_get          = tap_dev_info,
1207         .rx_queue_setup         = tap_rx_queue_setup,
1208         .tx_queue_setup         = tap_tx_queue_setup,
1209         .rx_queue_release       = tap_rx_queue_release,
1210         .tx_queue_release       = tap_tx_queue_release,
1211         .flow_ctrl_get          = tap_flow_ctrl_get,
1212         .flow_ctrl_set          = tap_flow_ctrl_set,
1213         .link_update            = tap_link_update,
1214         .dev_set_link_up        = tap_link_set_up,
1215         .dev_set_link_down      = tap_link_set_down,
1216         .promiscuous_enable     = tap_promisc_enable,
1217         .promiscuous_disable    = tap_promisc_disable,
1218         .allmulticast_enable    = tap_allmulti_enable,
1219         .allmulticast_disable   = tap_allmulti_disable,
1220         .mac_addr_set           = tap_mac_set,
1221         .mtu_set                = tap_mtu_set,
1222         .set_mc_addr_list       = tap_set_mc_addr_list,
1223         .stats_get              = tap_stats_get,
1224         .stats_reset            = tap_stats_reset,
1225         .dev_supported_ptypes_get = tap_dev_supported_ptypes_get,
1226         .filter_ctrl            = tap_dev_filter_ctrl,
1227 };
1228
1229 static int
1230 eth_dev_tap_create(struct rte_vdev_device *vdev, char *tap_name,
1231                    char *remote_iface, int fixed_mac_type)
1232 {
1233         int numa_node = rte_socket_id();
1234         struct rte_eth_dev *dev;
1235         struct pmd_internals *pmd;
1236         struct rte_eth_dev_data *data;
1237         struct ifreq ifr;
1238         int i;
1239
1240         RTE_LOG(DEBUG, PMD, "  TAP device on numa %u\n", rte_socket_id());
1241
1242         data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node);
1243         if (!data) {
1244                 RTE_LOG(ERR, PMD, "TAP Failed to allocate data\n");
1245                 goto error_exit;
1246         }
1247
1248         dev = rte_eth_vdev_allocate(vdev, sizeof(*pmd));
1249         if (!dev) {
1250                 RTE_LOG(ERR, PMD, "TAP Unable to allocate device struct\n");
1251                 goto error_exit;
1252         }
1253
1254         pmd = dev->data->dev_private;
1255         pmd->dev = dev;
1256         snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name);
1257
1258         pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
1259         if (pmd->ioctl_sock == -1) {
1260                 RTE_LOG(ERR, PMD,
1261                         "TAP Unable to get a socket for management: %s\n",
1262                         strerror(errno));
1263                 goto error_exit;
1264         }
1265
1266         /* Setup some default values */
1267         rte_memcpy(data, dev->data, sizeof(*data));
1268         data->dev_private = pmd;
1269         data->dev_flags = RTE_ETH_DEV_DETACHABLE | RTE_ETH_DEV_INTR_LSC;
1270         data->numa_node = numa_node;
1271
1272         data->dev_link = pmd_link;
1273         data->mac_addrs = &pmd->eth_addr;
1274         /* Set the number of RX and TX queues */
1275         data->nb_rx_queues = 0;
1276         data->nb_tx_queues = 0;
1277
1278         dev->data = data;
1279         dev->dev_ops = &ops;
1280         dev->rx_pkt_burst = pmd_rx_burst;
1281         dev->tx_pkt_burst = pmd_tx_burst;
1282
1283         pmd->intr_handle.type = RTE_INTR_HANDLE_EXT;
1284         pmd->intr_handle.fd = -1;
1285
1286         /* Presetup the fds to -1 as being not valid */
1287         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1288                 pmd->rxq[i].fd = -1;
1289                 pmd->txq[i].fd = -1;
1290         }
1291
1292         if (fixed_mac_type) {
1293                 /* fixed mac = 00:64:74:61:70:<iface_idx> */
1294                 static int iface_idx;
1295                 char mac[ETHER_ADDR_LEN] = "\0dtap";
1296
1297                 mac[ETHER_ADDR_LEN - 1] = iface_idx++;
1298                 rte_memcpy(&pmd->eth_addr, mac, ETHER_ADDR_LEN);
1299         } else {
1300                 eth_random_addr((uint8_t *)&pmd->eth_addr);
1301         }
1302
1303         /* Immediately create the netdevice (this will create the 1st queue). */
1304         /* rx queue */
1305         if (tap_setup_queue(dev, pmd, 0, 1) == -1)
1306                 goto error_exit;
1307         /* tx queue */
1308         if (tap_setup_queue(dev, pmd, 0, 0) == -1)
1309                 goto error_exit;
1310
1311         ifr.ifr_mtu = dev->data->mtu;
1312         if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE) < 0)
1313                 goto error_exit;
1314
1315         memset(&ifr, 0, sizeof(struct ifreq));
1316         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
1317         rte_memcpy(ifr.ifr_hwaddr.sa_data, &pmd->eth_addr, ETHER_ADDR_LEN);
1318         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
1319                 goto error_exit;
1320
1321         /*
1322          * Set up everything related to rte_flow:
1323          * - netlink socket
1324          * - tap / remote if_index
1325          * - mandatory QDISCs
1326          * - rte_flow actual/implicit lists
1327          * - implicit rules
1328          */
1329         pmd->nlsk_fd = nl_init(0);
1330         if (pmd->nlsk_fd == -1) {
1331                 RTE_LOG(WARNING, PMD, "%s: failed to create netlink socket.\n",
1332                         pmd->name);
1333                 goto disable_rte_flow;
1334         }
1335         pmd->if_index = if_nametoindex(pmd->name);
1336         if (!pmd->if_index) {
1337                 RTE_LOG(ERR, PMD, "%s: failed to get if_index.\n", pmd->name);
1338                 goto disable_rte_flow;
1339         }
1340         if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) {
1341                 RTE_LOG(ERR, PMD, "%s: failed to create multiq qdisc.\n",
1342                         pmd->name);
1343                 goto disable_rte_flow;
1344         }
1345         if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) {
1346                 RTE_LOG(ERR, PMD, "%s: failed to create ingress qdisc.\n",
1347                         pmd->name);
1348                 goto disable_rte_flow;
1349         }
1350         LIST_INIT(&pmd->flows);
1351
1352         if (strlen(remote_iface)) {
1353                 pmd->remote_if_index = if_nametoindex(remote_iface);
1354                 if (!pmd->remote_if_index) {
1355                         RTE_LOG(ERR, PMD, "%s: failed to get %s if_index.\n",
1356                                 pmd->name, remote_iface);
1357                         goto error_remote;
1358                 }
1359                 snprintf(pmd->remote_iface, RTE_ETH_NAME_MAX_LEN,
1360                          "%s", remote_iface);
1361
1362                 /* Save state of remote device */
1363                 tap_ioctl(pmd, SIOCGIFFLAGS, &pmd->remote_initial_flags, 0, REMOTE_ONLY);
1364
1365                 /* Replicate remote MAC address */
1366                 if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0) {
1367                         RTE_LOG(ERR, PMD, "%s: failed to get %s MAC address.\n",
1368                                 pmd->name, pmd->remote_iface);
1369                         goto error_remote;
1370                 }
1371                 rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data,
1372                            ETHER_ADDR_LEN);
1373                 /* The desired MAC is already in ifreq after SIOCGIFHWADDR. */
1374                 if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0) {
1375                         RTE_LOG(ERR, PMD, "%s: failed to get %s MAC address.\n",
1376                                 pmd->name, remote_iface);
1377                         goto error_remote;
1378                 }
1379
1380                 /*
1381                  * Flush usually returns negative value because it tries to
1382                  * delete every QDISC (and on a running device, one QDISC at
1383                  * least is needed). Ignore negative return value.
1384                  */
1385                 qdisc_flush(pmd->nlsk_fd, pmd->remote_if_index);
1386                 if (qdisc_create_ingress(pmd->nlsk_fd,
1387                                          pmd->remote_if_index) < 0) {
1388                         RTE_LOG(ERR, PMD, "%s: failed to create ingress qdisc.\n",
1389                                 pmd->remote_iface);
1390                         goto error_remote;
1391                 }
1392                 LIST_INIT(&pmd->implicit_flows);
1393                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_TX) < 0 ||
1394                     tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0 ||
1395                     tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCAST) < 0 ||
1396                     tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCASTV6) < 0) {
1397                         RTE_LOG(ERR, PMD,
1398                                 "%s: failed to create implicit rules.\n",
1399                                 pmd->name);
1400                         goto error_remote;
1401                 }
1402         }
1403
1404         return 0;
1405
1406 disable_rte_flow:
1407         RTE_LOG(ERR, PMD, " Disabling rte flow support: %s(%d)\n",
1408                 strerror(errno), errno);
1409         if (strlen(remote_iface)) {
1410                 RTE_LOG(ERR, PMD, "Remote feature requires flow support.\n");
1411                 goto error_exit;
1412         }
1413         return 0;
1414
1415 error_remote:
1416         RTE_LOG(ERR, PMD, " Can't set up remote feature: %s(%d)\n",
1417                 strerror(errno), errno);
1418         tap_flow_implicit_flush(pmd, NULL);
1419
1420 error_exit:
1421         RTE_LOG(ERR, PMD, "TAP Unable to initialize %s\n",
1422                 rte_vdev_device_name(vdev));
1423
1424         rte_free(data);
1425         return -EINVAL;
1426 }
1427
1428 static int
1429 set_interface_name(const char *key __rte_unused,
1430                    const char *value,
1431                    void *extra_args)
1432 {
1433         char *name = (char *)extra_args;
1434
1435         if (value)
1436                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
1437         else
1438                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
1439                          DEFAULT_TAP_NAME, (tap_unit - 1));
1440
1441         return 0;
1442 }
1443
1444 static int
1445 set_interface_speed(const char *key __rte_unused,
1446                     const char *value,
1447                     void *extra_args)
1448 {
1449         *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G;
1450
1451         return 0;
1452 }
1453
1454 static int
1455 set_remote_iface(const char *key __rte_unused,
1456                  const char *value,
1457                  void *extra_args)
1458 {
1459         char *name = (char *)extra_args;
1460
1461         if (value)
1462                 snprintf(name, RTE_ETH_NAME_MAX_LEN, "%s", value);
1463
1464         return 0;
1465 }
1466
1467 static int
1468 set_mac_type(const char *key __rte_unused,
1469              const char *value,
1470              void *extra_args)
1471 {
1472         if (value &&
1473             !strncasecmp(ETH_TAP_MAC_FIXED, value, strlen(ETH_TAP_MAC_FIXED)))
1474                 *(int *)extra_args = 1;
1475         return 0;
1476 }
1477
1478 /* Open a TAP interface device.
1479  */
1480 static int
1481 rte_pmd_tap_probe(struct rte_vdev_device *dev)
1482 {
1483         const char *name, *params;
1484         int ret;
1485         struct rte_kvargs *kvlist = NULL;
1486         int speed;
1487         char tap_name[RTE_ETH_NAME_MAX_LEN];
1488         char remote_iface[RTE_ETH_NAME_MAX_LEN];
1489         int fixed_mac_type = 0;
1490
1491         name = rte_vdev_device_name(dev);
1492         params = rte_vdev_device_args(dev);
1493
1494         speed = ETH_SPEED_NUM_10G;
1495         snprintf(tap_name, sizeof(tap_name), "%s%d",
1496                  DEFAULT_TAP_NAME, tap_unit++);
1497         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
1498
1499         if (params && (params[0] != '\0')) {
1500                 RTE_LOG(DEBUG, PMD, "parameters (%s)\n", params);
1501
1502                 kvlist = rte_kvargs_parse(params, valid_arguments);
1503                 if (kvlist) {
1504                         if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) {
1505                                 ret = rte_kvargs_process(kvlist,
1506                                                          ETH_TAP_SPEED_ARG,
1507                                                          &set_interface_speed,
1508                                                          &speed);
1509                                 if (ret == -1)
1510                                         goto leave;
1511                         }
1512
1513                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
1514                                 ret = rte_kvargs_process(kvlist,
1515                                                          ETH_TAP_IFACE_ARG,
1516                                                          &set_interface_name,
1517                                                          tap_name);
1518                                 if (ret == -1)
1519                                         goto leave;
1520                         }
1521
1522                         if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) {
1523                                 ret = rte_kvargs_process(kvlist,
1524                                                          ETH_TAP_REMOTE_ARG,
1525                                                          &set_remote_iface,
1526                                                          remote_iface);
1527                                 if (ret == -1)
1528                                         goto leave;
1529                         }
1530
1531                         if (rte_kvargs_count(kvlist, ETH_TAP_MAC_ARG) == 1) {
1532                                 ret = rte_kvargs_process(kvlist,
1533                                                          ETH_TAP_MAC_ARG,
1534                                                          &set_mac_type,
1535                                                          &fixed_mac_type);
1536                                 if (ret == -1)
1537                                         goto leave;
1538                         }
1539                 }
1540         }
1541         pmd_link.link_speed = speed;
1542
1543         RTE_LOG(NOTICE, PMD, "Initializing pmd_tap for %s as %s\n",
1544                 name, tap_name);
1545
1546         ret = eth_dev_tap_create(dev, tap_name, remote_iface, fixed_mac_type);
1547
1548 leave:
1549         if (ret == -1) {
1550                 RTE_LOG(ERR, PMD, "Failed to create pmd for %s as %s\n",
1551                         name, tap_name);
1552                 tap_unit--;             /* Restore the unit number */
1553         }
1554         rte_kvargs_free(kvlist);
1555
1556         return ret;
1557 }
1558
1559 /* detach a TAP device.
1560  */
1561 static int
1562 rte_pmd_tap_remove(struct rte_vdev_device *dev)
1563 {
1564         struct rte_eth_dev *eth_dev = NULL;
1565         struct pmd_internals *internals;
1566         int i;
1567
1568         RTE_LOG(DEBUG, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
1569                 rte_socket_id());
1570
1571         /* find the ethdev entry */
1572         eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
1573         if (!eth_dev)
1574                 return 0;
1575
1576         internals = eth_dev->data->dev_private;
1577         if (internals->nlsk_fd) {
1578                 tap_flow_flush(eth_dev, NULL);
1579                 tap_flow_implicit_flush(internals, NULL);
1580                 nl_final(internals->nlsk_fd);
1581         }
1582         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1583                 if (internals->rxq[i].fd != -1) {
1584                         close(internals->rxq[i].fd);
1585                         internals->rxq[i].fd = -1;
1586                 }
1587                 if (internals->txq[i].fd != -1) {
1588                         close(internals->txq[i].fd);
1589                         internals->txq[i].fd = -1;
1590                 }
1591         }
1592
1593         close(internals->ioctl_sock);
1594         rte_free(eth_dev->data->dev_private);
1595         rte_free(eth_dev->data);
1596
1597         rte_eth_dev_release_port(eth_dev);
1598
1599         return 0;
1600 }
1601
1602 static struct rte_vdev_driver pmd_tap_drv = {
1603         .probe = rte_pmd_tap_probe,
1604         .remove = rte_pmd_tap_remove,
1605 };
1606 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
1607 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
1608 RTE_PMD_REGISTER_PARAM_STRING(net_tap,
1609                               ETH_TAP_IFACE_ARG "=<string> "
1610                               ETH_TAP_SPEED_ARG "=<int> "
1611                               ETH_TAP_MAC_ARG "=" ETH_TAP_MAC_FIXED " "
1612                               ETH_TAP_REMOTE_ARG "=<string>");