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 <fcntl.h>
  64
  65 #include <rte_eth_tap.h>
  66 #include <tap_flow.h>
  67 #include <tap_netlink.h>
  68 #include <tap_tcmsgs.h>
  69
  70 /* Linux based path to the TUN device */
  71 #define TUN_TAP_DEV_PATH        "/dev/net/tun"
  72 #define DEFAULT_TAP_NAME        "dtap"
  73
  74 #define ETH_TAP_IFACE_ARG       "iface"
  75 #define ETH_TAP_SPEED_ARG       "speed"
  76 #define ETH_TAP_REMOTE_ARG      "remote"
  77 #define ETH_TAP_MAC_ARG         "mac"
  78 #define ETH_TAP_MAC_FIXED       "fixed"
  79
  80 static struct rte_vdev_driver pmd_tap_drv;
  81
  82 static const char *valid_arguments[] = {
  83         ETH_TAP_IFACE_ARG,
  84         ETH_TAP_SPEED_ARG,
  85         ETH_TAP_REMOTE_ARG,
  86         ETH_TAP_MAC_ARG,
  87         NULL
  88 };
  89
  90 static int tap_unit;
  91
  92 static volatile uint32_t tap_trigger;   /* Rx trigger */
  93
  94 static struct rte_eth_link pmd_link = {
  95         .link_speed = ETH_SPEED_NUM_10G,
  96         .link_duplex = ETH_LINK_FULL_DUPLEX,
  97         .link_status = ETH_LINK_DOWN,
  98         .link_autoneg = ETH_LINK_FIXED,
  99 };
 100
 101 static void
 102 tap_trigger_cb(int sig __rte_unused)
 103 {
 104         /* Valid trigger values are nonzero */
 105         tap_trigger = (tap_trigger + 1) | 0x80000000;
 106 }
 107
 108 /* Specifies on what netdevices the ioctl should be applied */
 109 enum ioctl_mode {
 110         LOCAL_AND_REMOTE,
 111         LOCAL_ONLY,
 112         REMOTE_ONLY,
 113 };
 114
 115 static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
 116
 117 /* Tun/Tap allocation routine
 118  *
 119  * name is the number of the interface to use, unless NULL to take the host
 120  * supplied name.
 121  */
 122 static int
 123 tun_alloc(struct pmd_internals *pmd)
 124 {
 125         struct ifreq ifr;
 126 #ifdef IFF_MULTI_QUEUE
 127         unsigned int features;
 128 #endif
 129         int fd;
 130
 131         memset(&ifr, 0, sizeof(struct ifreq));
 132
 133         /*
 134          * Do not set IFF_NO_PI as packet information header will be needed
 135          * to check if a received packet has been truncated.
 136          */
 137         ifr.ifr_flags = IFF_TAP;
 138         snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
 139
 140         RTE_LOG(DEBUG, PMD, "ifr_name '%s'\n", ifr.ifr_name);
 141
 142         fd = open(TUN_TAP_DEV_PATH, O_RDWR);
 143         if (fd < 0) {
 144                 RTE_LOG(ERR, PMD, "Unable to create TAP interface\n");
 145                 goto error;
 146         }
 147
 148 #ifdef IFF_MULTI_QUEUE
 149         /* Grab the TUN features to verify we can work multi-queue */
 150         if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
 151                 RTE_LOG(ERR, PMD, "TAP unable to get TUN/TAP features\n");
 152                 goto error;
 153         }
 154         RTE_LOG(DEBUG, PMD, "  TAP Features %08x\n", features);
 155
 156         if (features & IFF_MULTI_QUEUE) {
 157                 RTE_LOG(DEBUG, PMD, "  Multi-queue support for %d queues\n",
 158                         RTE_PMD_TAP_MAX_QUEUES);
 159                 ifr.ifr_flags |= IFF_MULTI_QUEUE;
 160         } else
 161 #endif
 162         {
 163                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 164                 RTE_LOG(DEBUG, PMD, "  Single queue only support\n");
 165         }
 166
 167         /* Set the TUN/TAP configuration and set the name if needed */
 168         if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
 169                 RTE_LOG(WARNING, PMD,
 170                         "Unable to set TUNSETIFF for %s\n",
 171                         ifr.ifr_name);
 172                 perror("TUNSETIFF");
 173                 goto error;
 174         }
 175
 176         /* Always set the file descriptor to non-blocking */
 177         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
 178                 RTE_LOG(WARNING, PMD,
 179                         "Unable to set %s to nonblocking\n",
 180                         ifr.ifr_name);
 181                 perror("F_SETFL, NONBLOCK");
 182                 goto error;
 183         }
 184
 185         /* Set up trigger to optimize empty Rx bursts */
 186         errno = 0;
 187         do {
 188                 struct sigaction sa;
 189                 int flags = fcntl(fd, F_GETFL);
 190
 191                 if (flags == -1 || sigaction(SIGIO, NULL, &sa) == -1)
 192                         break;
 193                 if (sa.sa_handler != tap_trigger_cb) {
 194                         /*
 195                          * Make sure SIGIO is not already taken. This is done
 196                          * as late as possible to leave the application a
 197                          * chance to set up its own signal handler first.
 198                          */
 199                         if (sa.sa_handler != SIG_IGN &&
 200                             sa.sa_handler != SIG_DFL) {
 201                                 errno = EBUSY;
 202                                 break;
 203                         }
 204                         sa = (struct sigaction){
 205                                 .sa_flags = SA_RESTART,
 206                                 .sa_handler = tap_trigger_cb,
 207                         };
 208                         if (sigaction(SIGIO, &sa, NULL) == -1)
 209                                 break;
 210                 }
 211                 /* Enable SIGIO on file descriptor */
 212                 fcntl(fd, F_SETFL, flags | O_ASYNC);
 213                 fcntl(fd, F_SETOWN, getpid());
 214         } while (0);
 215         if (errno) {
 216                 /* Disable trigger globally in case of error */
 217                 tap_trigger = 0;
 218                 RTE_LOG(WARNING, PMD, "Rx trigger disabled: %s\n",
 219                         strerror(errno));
 220         }
 221
 222         return fd;
 223
 224 error:
 225         if (fd > 0)
 226                 close(fd);
 227         return -1;
 228 }
 229
 230 static void
 231 tap_verify_csum(struct rte_mbuf *mbuf)
 232 {
 233         uint32_t l2 = mbuf->packet_type & RTE_PTYPE_L2_MASK;
 234         uint32_t l3 = mbuf->packet_type & RTE_PTYPE_L3_MASK;
 235         uint32_t l4 = mbuf->packet_type & RTE_PTYPE_L4_MASK;
 236         unsigned int l2_len = sizeof(struct ether_hdr);
 237         unsigned int l3_len;
 238         uint16_t cksum = 0;
 239         void *l3_hdr;
 240         void *l4_hdr;
 241
 242         if (l2 == RTE_PTYPE_L2_ETHER_VLAN)
 243                 l2_len += 4;
 244         else if (l2 == RTE_PTYPE_L2_ETHER_QINQ)
 245                 l2_len += 8;
 246         /* Don't verify checksum for packets with discontinuous L2 header */
 247         if (unlikely(l2_len + sizeof(struct ipv4_hdr) >
 248                      rte_pktmbuf_data_len(mbuf)))
 249                 return;
 250         l3_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len);
 251         if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
 252                 struct ipv4_hdr *iph = l3_hdr;
 253
 254                 /* ihl contains the number of 4-byte words in the header */
 255                 l3_len = 4 * (iph->version_ihl & 0xf);
 256                 if (unlikely(l2_len + l3_len > rte_pktmbuf_data_len(mbuf)))
 257                         return;
 258
 259                 cksum = ~rte_raw_cksum(iph, l3_len);
 260                 mbuf->ol_flags |= cksum ?
 261                         PKT_RX_IP_CKSUM_BAD :
 262                         PKT_RX_IP_CKSUM_GOOD;
 263         } else if (l3 == RTE_PTYPE_L3_IPV6) {
 264                 l3_len = sizeof(struct ipv6_hdr);
 265         } else {
 266                 /* IPv6 extensions are not supported */
 267                 return;
 268         }
 269         if (l4 == RTE_PTYPE_L4_UDP || l4 == RTE_PTYPE_L4_TCP) {
 270                 l4_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len + l3_len);
 271                 /* Don't verify checksum for multi-segment packets. */
 272                 if (mbuf->nb_segs > 1)
 273                         return;
 274                 if (l3 == RTE_PTYPE_L3_IPV4)
 275                         cksum = ~rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
 276                 else if (l3 == RTE_PTYPE_L3_IPV6)
 277                         cksum = ~rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
 278                 mbuf->ol_flags |= cksum ?
 279                         PKT_RX_L4_CKSUM_BAD :
 280                         PKT_RX_L4_CKSUM_GOOD;
 281         }
 282 }
 283
 284 /* Callback to handle the rx burst of packets to the correct interface and
 285  * file descriptor(s) in a multi-queue setup.
 286  */
 287 static uint16_t
 288 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 289 {
 290         struct rx_queue *rxq = queue;
 291         uint16_t num_rx;
 292         unsigned long num_rx_bytes = 0;
 293         uint32_t trigger = tap_trigger;
 294
 295         if (trigger == rxq->trigger_seen)
 296                 return 0;
 297         if (trigger)
 298                 rxq->trigger_seen = trigger;
 299         rte_compiler_barrier();
 300         for (num_rx = 0; num_rx < nb_pkts; ) {
 301                 struct rte_mbuf *mbuf = rxq->pool;
 302                 struct rte_mbuf *seg = NULL;
 303                 struct rte_mbuf *new_tail = NULL;
 304                 uint16_t data_off = rte_pktmbuf_headroom(mbuf);
 305                 int len;
 306
 307                 len = readv(rxq->fd, *rxq->iovecs,
 308                             1 + (rxq->rxmode->enable_scatter ?
 309                                  rxq->nb_rx_desc : 1));
 310                 if (len < (int)sizeof(struct tun_pi))
 311                         break;
 312
 313                 /* Packet couldn't fit in the provided mbuf */
 314                 if (unlikely(rxq->pi.flags & TUN_PKT_STRIP)) {
 315                         rxq->stats.ierrors++;
 316                         continue;
 317                 }
 318
 319                 len -= sizeof(struct tun_pi);
 320
 321                 mbuf->pkt_len = len;
 322                 mbuf->port = rxq->in_port;
 323                 while (1) {
 324                         struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp);
 325
 326                         if (unlikely(!buf)) {
 327                                 rxq->stats.rx_nombuf++;
 328                                 /* No new buf has been allocated: do nothing */
 329                                 if (!new_tail || !seg)
 330                                         goto end;
 331
 332                                 seg->next = NULL;
 333                                 rte_pktmbuf_free(mbuf);
 334
 335                                 goto end;
 336                         }
 337                         seg = seg ? seg->next : mbuf;
 338                         if (rxq->pool == mbuf)
 339                                 rxq->pool = buf;
 340                         if (new_tail)
 341                                 new_tail->next = buf;
 342                         new_tail = buf;
 343                         new_tail->next = seg->next;
 344
 345                         /* iovecs[0] is reserved for packet info (pi) */
 346                         (*rxq->iovecs)[mbuf->nb_segs].iov_len =
 347                                 buf->buf_len - data_off;
 348                         (*rxq->iovecs)[mbuf->nb_segs].iov_base =
 349                                 (char *)buf->buf_addr + data_off;
 350
 351                         seg->data_len = RTE_MIN(seg->buf_len - data_off, len);
 352                         seg->data_off = data_off;
 353
 354                         len -= seg->data_len;
 355                         if (len <= 0)
 356                                 break;
 357                         mbuf->nb_segs++;
 358                         /* First segment has headroom, not the others */
 359                         data_off = 0;
 360                 }
 361                 seg->next = NULL;
 362                 mbuf->packet_type = rte_net_get_ptype(mbuf, NULL,
 363                                                       RTE_PTYPE_ALL_MASK);
 364                 if (rxq->rxmode->hw_ip_checksum)
 365                         tap_verify_csum(mbuf);
 366
 367                 /* account for the receive frame */
 368                 bufs[num_rx++] = mbuf;
 369                 num_rx_bytes += mbuf->pkt_len;
 370         }
 371 end:
 372         rxq->stats.ipackets += num_rx;
 373         rxq->stats.ibytes += num_rx_bytes;
 374
 375         return num_rx;
 376 }
 377
 378 static void
 379 tap_tx_offload(char *packet, uint64_t ol_flags, unsigned int l2_len,
 380                unsigned int l3_len)
 381 {
 382         void *l3_hdr = packet + l2_len;
 383
 384         if (ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4)) {
 385                 struct ipv4_hdr *iph = l3_hdr;
 386                 uint16_t cksum;
 387
 388                 iph->hdr_checksum = 0;
 389                 cksum = rte_raw_cksum(iph, l3_len);
 390                 iph->hdr_checksum = (cksum == 0xffff) ? cksum : ~cksum;
 391         }
 392         if (ol_flags & PKT_TX_L4_MASK) {
 393                 uint16_t l4_len;
 394                 uint32_t cksum;
 395                 uint16_t *l4_cksum;
 396                 void *l4_hdr;
 397
 398                 l4_hdr = packet + l2_len + l3_len;
 399                 if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM)
 400                         l4_cksum = &((struct udp_hdr *)l4_hdr)->dgram_cksum;
 401                 else if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM)
 402                         l4_cksum = &((struct tcp_hdr *)l4_hdr)->cksum;
 403                 else
 404                         return;
 405                 *l4_cksum = 0;
 406                 if (ol_flags & PKT_TX_IPV4) {
 407                         struct ipv4_hdr *iph = l3_hdr;
 408
 409                         l4_len = rte_be_to_cpu_16(iph->total_length) - l3_len;
 410                         cksum = rte_ipv4_phdr_cksum(l3_hdr, 0);
 411                 } else {
 412                         struct ipv6_hdr *ip6h = l3_hdr;
 413
 414                         /* payload_len does not include ext headers */
 415                         l4_len = rte_be_to_cpu_16(ip6h->payload_len) -
 416                                 l3_len + sizeof(struct ipv6_hdr);
 417                         cksum = rte_ipv6_phdr_cksum(l3_hdr, 0);
 418                 }
 419                 cksum += rte_raw_cksum(l4_hdr, l4_len);
 420                 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
 421                 cksum = (~cksum) & 0xffff;
 422                 if (cksum == 0)
 423                         cksum = 0xffff;
 424                 *l4_cksum = cksum;
 425         }
 426 }
 427
 428 /* Callback to handle sending packets from the tap interface
 429  */
 430 static uint16_t
 431 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 432 {
 433         struct tx_queue *txq = queue;
 434         uint16_t num_tx = 0;
 435         unsigned long num_tx_bytes = 0;
 436         uint32_t max_size;
 437         int i;
 438
 439         if (unlikely(nb_pkts == 0))
 440                 return 0;
 441
 442         max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4);
 443         for (i = 0; i < nb_pkts; i++) {
 444                 struct rte_mbuf *mbuf = bufs[num_tx];
 445                 struct iovec iovecs[mbuf->nb_segs + 1];
 446                 struct tun_pi pi = { .flags = 0 };
 447                 struct rte_mbuf *seg = mbuf;
 448                 char m_copy[mbuf->data_len];
 449                 int n;
 450                 int j;
 451
 452                 /* stats.errs will be incremented */
 453                 if (rte_pktmbuf_pkt_len(mbuf) > max_size)
 454                         break;
 455
 456                 iovecs[0].iov_base = &pi;
 457                 iovecs[0].iov_len = sizeof(pi);
 458                 for (j = 1; j <= mbuf->nb_segs; j++) {
 459                         iovecs[j].iov_len = rte_pktmbuf_data_len(seg);
 460                         iovecs[j].iov_base =
 461                                 rte_pktmbuf_mtod(seg, void *);
 462                         seg = seg->next;
 463                 }
 464                 if (mbuf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4) ||
 465                     (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM ||
 466                     (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM) {
 467                         /* Support only packets with all data in the same seg */
 468                         if (mbuf->nb_segs > 1)
 469                                 break;
 470                         /* To change checksums, work on a copy of data. */
 471                         rte_memcpy(m_copy, rte_pktmbuf_mtod(mbuf, void *),
 472                                    rte_pktmbuf_data_len(mbuf));
 473                         tap_tx_offload(m_copy, mbuf->ol_flags,
 474                                        mbuf->l2_len, mbuf->l3_len);
 475                         iovecs[1].iov_base = m_copy;
 476                 }
 477                 /* copy the tx frame data */
 478                 n = writev(txq->fd, iovecs, mbuf->nb_segs + 1);
 479                 if (n <= 0)
 480                         break;
 481
 482                 num_tx++;
 483                 num_tx_bytes += mbuf->pkt_len;
 484                 rte_pktmbuf_free(mbuf);
 485         }
 486
 487         txq->stats.opackets += num_tx;
 488         txq->stats.errs += nb_pkts - num_tx;
 489         txq->stats.obytes += num_tx_bytes;
 490
 491         return num_tx;
 492 }
 493
 494 static const char *
 495 tap_ioctl_req2str(unsigned long request)
 496 {
 497         switch (request) {
 498         case SIOCSIFFLAGS:
 499                 return "SIOCSIFFLAGS";
 500         case SIOCGIFFLAGS:
 501                 return "SIOCGIFFLAGS";
 502         case SIOCGIFHWADDR:
 503                 return "SIOCGIFHWADDR";
 504         case SIOCSIFHWADDR:
 505                 return "SIOCSIFHWADDR";
 506         case SIOCSIFMTU:
 507                 return "SIOCSIFMTU";
 508         }
 509         return "UNKNOWN";
 510 }
 511
 512 static int
 513 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 514           struct ifreq *ifr, int set, enum ioctl_mode mode)
 515 {
 516         short req_flags = ifr->ifr_flags;
 517         int remote = pmd->remote_if_index &&
 518                 (mode == REMOTE_ONLY || mode == LOCAL_AND_REMOTE);
 519
 520         if (!pmd->remote_if_index && mode == REMOTE_ONLY)
 521                 return 0;
 522         /*
 523          * If there is a remote netdevice, apply ioctl on it, then apply it on
 524          * the tap netdevice.
 525          */
 526 apply:
 527         if (remote)
 528                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->remote_iface);
 529         else if (mode == LOCAL_ONLY || mode == LOCAL_AND_REMOTE)
 530                 snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->name);
 531         switch (request) {
 532         case SIOCSIFFLAGS:
 533                 /* fetch current flags to leave other flags untouched */
 534                 if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
 535                         goto error;
 536                 if (set)
 537                         ifr->ifr_flags |= req_flags;
 538                 else
 539                         ifr->ifr_flags &= ~req_flags;
 540                 break;
 541         case SIOCGIFFLAGS:
 542         case SIOCGIFHWADDR:
 543         case SIOCSIFHWADDR:
 544         case SIOCSIFMTU:
 545                 break;
 546         default:
 547                 RTE_LOG(WARNING, PMD, "%s: ioctl() called with wrong arg\n",
 548                         pmd->name);
 549                 return -EINVAL;
 550         }
 551         if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
 552                 goto error;
 553         if (remote-- && mode == LOCAL_AND_REMOTE)
 554                 goto apply;
 555         return 0;
 556
 557 error:
 558         RTE_LOG(DEBUG, PMD, "%s: %s(%s) failed: %s(%d)\n", ifr->ifr_name,
 559                 __func__, tap_ioctl_req2str(request), strerror(errno), errno);
 560         return -errno;
 561 }
 562
 563 static int
 564 tap_link_set_down(struct rte_eth_dev *dev)
 565 {
 566         struct pmd_internals *pmd = dev->data->dev_private;
 567         struct ifreq ifr = { .ifr_flags = IFF_UP };
 568
 569         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 570         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_ONLY);
 571 }
 572
 573 static int
 574 tap_link_set_up(struct rte_eth_dev *dev)
 575 {
 576         struct pmd_internals *pmd = dev->data->dev_private;
 577         struct ifreq ifr = { .ifr_flags = IFF_UP };
 578
 579         dev->data->dev_link.link_status = ETH_LINK_UP;
 580         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 581 }
 582
 583 static int
 584 tap_dev_start(struct rte_eth_dev *dev)
 585 {
 586         int err;
 587
 588         err = tap_intr_handle_set(dev, 1);
 589         if (err)
 590                 return err;
 591         return tap_link_set_up(dev);
 592 }
 593
 594 /* This function gets called when the current port gets stopped.
 595  */
 596 static void
 597 tap_dev_stop(struct rte_eth_dev *dev)
 598 {
 599         tap_intr_handle_set(dev, 0);
 600         tap_link_set_down(dev);
 601 }
 602
 603 static int
 604 tap_dev_configure(struct rte_eth_dev *dev)
 605 {
 606         if (dev->data->nb_rx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 607                 RTE_LOG(ERR, PMD,
 608                         "%s: number of rx queues %d exceeds max num of queues %d\n",
 609                         dev->device->name,
 610                         dev->data->nb_rx_queues,
 611                         RTE_PMD_TAP_MAX_QUEUES);
 612                 return -1;
 613         }
 614         if (dev->data->nb_tx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 615                 RTE_LOG(ERR, PMD,
 616                         "%s: number of tx queues %d exceeds max num of queues %d\n",
 617                         dev->device->name,
 618                         dev->data->nb_tx_queues,
 619                         RTE_PMD_TAP_MAX_QUEUES);
 620                 return -1;
 621         }
 622
 623         RTE_LOG(INFO, PMD, "%s: %p: TX configured queues number: %u\n",
 624              dev->device->name, (void *)dev, dev->data->nb_tx_queues);
 625
 626         RTE_LOG(INFO, PMD, "%s: %p: RX configured queues number: %u\n",
 627              dev->device->name, (void *)dev, dev->data->nb_rx_queues);
 628
 629         return 0;
 630 }
 631
 632 static uint32_t
 633 tap_dev_speed_capa(void)
 634 {
 635         uint32_t speed = pmd_link.link_speed;
 636         uint32_t capa = 0;
 637
 638         if (speed >= ETH_SPEED_NUM_10M)
 639                 capa |= ETH_LINK_SPEED_10M;
 640         if (speed >= ETH_SPEED_NUM_100M)
 641                 capa |= ETH_LINK_SPEED_100M;
 642         if (speed >= ETH_SPEED_NUM_1G)
 643                 capa |= ETH_LINK_SPEED_1G;
 644         if (speed >= ETH_SPEED_NUM_5G)
 645                 capa |= ETH_LINK_SPEED_2_5G;
 646         if (speed >= ETH_SPEED_NUM_5G)
 647                 capa |= ETH_LINK_SPEED_5G;
 648         if (speed >= ETH_SPEED_NUM_10G)
 649                 capa |= ETH_LINK_SPEED_10G;
 650         if (speed >= ETH_SPEED_NUM_20G)
 651                 capa |= ETH_LINK_SPEED_20G;
 652         if (speed >= ETH_SPEED_NUM_25G)
 653                 capa |= ETH_LINK_SPEED_25G;
 654         if (speed >= ETH_SPEED_NUM_40G)
 655                 capa |= ETH_LINK_SPEED_40G;
 656         if (speed >= ETH_SPEED_NUM_50G)
 657                 capa |= ETH_LINK_SPEED_50G;
 658         if (speed >= ETH_SPEED_NUM_56G)
 659                 capa |= ETH_LINK_SPEED_56G;
 660         if (speed >= ETH_SPEED_NUM_100G)
 661                 capa |= ETH_LINK_SPEED_100G;
 662
 663         return capa;
 664 }
 665
 666 static void
 667 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 668 {
 669         struct pmd_internals *internals = dev->data->dev_private;
 670
 671         dev_info->if_index = internals->if_index;
 672         dev_info->max_mac_addrs = 1;
 673         dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN;
 674         dev_info->max_rx_queues = RTE_PMD_TAP_MAX_QUEUES;
 675         dev_info->max_tx_queues = RTE_PMD_TAP_MAX_QUEUES;
 676         dev_info->min_rx_bufsize = 0;
 677         dev_info->pci_dev = NULL;
 678         dev_info->speed_capa = tap_dev_speed_capa();
 679         dev_info->rx_offload_capa = (DEV_RX_OFFLOAD_IPV4_CKSUM |
 680                                      DEV_RX_OFFLOAD_UDP_CKSUM |
 681                                      DEV_RX_OFFLOAD_TCP_CKSUM);
 682         dev_info->tx_offload_capa =
 683                 (DEV_TX_OFFLOAD_IPV4_CKSUM |
 684                  DEV_TX_OFFLOAD_UDP_CKSUM |
 685                  DEV_TX_OFFLOAD_TCP_CKSUM);
 686 }
 687
 688 static int
 689 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
 690 {
 691         unsigned int i, imax;
 692         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 693         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
 694         unsigned long rx_nombuf = 0, ierrors = 0;
 695         const struct pmd_internals *pmd = dev->data->dev_private;
 696
 697         /* rx queue statistics */
 698         imax = (dev->data->nb_rx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 699                 dev->data->nb_rx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 700         for (i = 0; i < imax; i++) {
 701                 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
 702                 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
 703                 rx_total += tap_stats->q_ipackets[i];
 704                 rx_bytes_total += tap_stats->q_ibytes[i];
 705                 rx_nombuf += pmd->rxq[i].stats.rx_nombuf;
 706                 ierrors += pmd->rxq[i].stats.ierrors;
 707         }
 708
 709         /* tx queue statistics */
 710         imax = (dev->data->nb_tx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
 711                 dev->data->nb_tx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
 712
 713         for (i = 0; i < imax; i++) {
 714                 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
 715                 tap_stats->q_errors[i] = pmd->txq[i].stats.errs;
 716                 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
 717                 tx_total += tap_stats->q_opackets[i];
 718                 tx_err_total += tap_stats->q_errors[i];
 719                 tx_bytes_total += tap_stats->q_obytes[i];
 720         }
 721
 722         tap_stats->ipackets = rx_total;
 723         tap_stats->ibytes = rx_bytes_total;
 724         tap_stats->ierrors = ierrors;
 725         tap_stats->rx_nombuf = rx_nombuf;
 726         tap_stats->opackets = tx_total;
 727         tap_stats->oerrors = tx_err_total;
 728         tap_stats->obytes = tx_bytes_total;
 729         return 0;
 730 }
 731
 732 static void
 733 tap_stats_reset(struct rte_eth_dev *dev)
 734 {
 735         int i;
 736         struct pmd_internals *pmd = dev->data->dev_private;
 737
 738         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 739                 pmd->rxq[i].stats.ipackets = 0;
 740                 pmd->rxq[i].stats.ibytes = 0;
 741                 pmd->rxq[i].stats.ierrors = 0;
 742                 pmd->rxq[i].stats.rx_nombuf = 0;
 743
 744                 pmd->txq[i].stats.opackets = 0;
 745                 pmd->txq[i].stats.errs = 0;
 746                 pmd->txq[i].stats.obytes = 0;
 747         }
 748 }
 749
 750 static void
 751 tap_dev_close(struct rte_eth_dev *dev)
 752 {
 753         int i;
 754         struct pmd_internals *internals = dev->data->dev_private;
 755
 756         tap_link_set_down(dev);
 757         tap_flow_flush(dev, NULL);
 758         tap_flow_implicit_flush(internals, NULL);
 759
 760         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
 761                 if (internals->rxq[i].fd != -1) {
 762                         close(internals->rxq[i].fd);
 763                         internals->rxq[i].fd = -1;
 764                 }
 765                 if (internals->txq[i].fd != -1) {
 766                         close(internals->txq[i].fd);
 767                         internals->txq[i].fd = -1;
 768                 }
 769         }
 770
 771         if (internals->remote_if_index) {
 772                 /* Restore initial remote state */
 773                 ioctl(internals->ioctl_sock, SIOCSIFFLAGS,
 774                                 &internals->remote_initial_flags);
 775         }
 776 }
 777
 778 static void
 779 tap_rx_queue_release(void *queue)
 780 {
 781         struct rx_queue *rxq = queue;
 782
 783         if (rxq && (rxq->fd > 0)) {
 784                 close(rxq->fd);
 785                 rxq->fd = -1;
 786                 rte_pktmbuf_free(rxq->pool);
 787                 rte_free(rxq->iovecs);
 788                 rxq->pool = NULL;
 789                 rxq->iovecs = NULL;
 790         }
 791 }
 792
 793 static void
 794 tap_tx_queue_release(void *queue)
 795 {
 796         struct tx_queue *txq = queue;
 797
 798         if (txq && (txq->fd > 0)) {
 799                 close(txq->fd);
 800                 txq->fd = -1;
 801         }
 802 }
 803
 804 static int
 805 tap_link_update(struct rte_eth_dev *dev, int wait_to_complete __rte_unused)
 806 {
 807         struct rte_eth_link *dev_link = &dev->data->dev_link;
 808         struct pmd_internals *pmd = dev->data->dev_private;
 809         struct ifreq ifr = { .ifr_flags = 0 };
 810
 811         if (pmd->remote_if_index) {
 812                 tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, REMOTE_ONLY);
 813                 if (!(ifr.ifr_flags & IFF_UP) ||
 814                     !(ifr.ifr_flags & IFF_RUNNING)) {
 815                         dev_link->link_status = ETH_LINK_DOWN;
 816                         return 0;
 817                 }
 818         }
 819         tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, LOCAL_ONLY);
 820         dev_link->link_status =
 821                 ((ifr.ifr_flags & IFF_UP) && (ifr.ifr_flags & IFF_RUNNING) ?
 822                  ETH_LINK_UP :
 823                  ETH_LINK_DOWN);
 824         return 0;
 825 }
 826
 827 static void
 828 tap_promisc_enable(struct rte_eth_dev *dev)
 829 {
 830         struct pmd_internals *pmd = dev->data->dev_private;
 831         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 832
 833         dev->data->promiscuous = 1;
 834         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 835         if (pmd->remote_if_index && !pmd->flow_isolate)
 836                 tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC);
 837 }
 838
 839 static void
 840 tap_promisc_disable(struct rte_eth_dev *dev)
 841 {
 842         struct pmd_internals *pmd = dev->data->dev_private;
 843         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
 844
 845         dev->data->promiscuous = 0;
 846         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 847         if (pmd->remote_if_index && !pmd->flow_isolate)
 848                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC);
 849 }
 850
 851 static void
 852 tap_allmulti_enable(struct rte_eth_dev *dev)
 853 {
 854         struct pmd_internals *pmd = dev->data->dev_private;
 855         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 856
 857         dev->data->all_multicast = 1;
 858         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 859         if (pmd->remote_if_index && !pmd->flow_isolate)
 860                 tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI);
 861 }
 862
 863 static void
 864 tap_allmulti_disable(struct rte_eth_dev *dev)
 865 {
 866         struct pmd_internals *pmd = dev->data->dev_private;
 867         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
 868
 869         dev->data->all_multicast = 0;
 870         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
 871         if (pmd->remote_if_index && !pmd->flow_isolate)
 872                 tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI);
 873 }
 874
 875 static void
 876 tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
 877 {
 878         struct pmd_internals *pmd = dev->data->dev_private;
 879         enum ioctl_mode mode = LOCAL_ONLY;
 880         struct ifreq ifr;
 881
 882         if (is_zero_ether_addr(mac_addr)) {
 883                 RTE_LOG(ERR, PMD, "%s: can't set an empty MAC address\n",
 884                         dev->device->name);
 885                 return;
 886         }
 887         /* Check the actual current MAC address on the tap netdevice */
 888         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
 889                 return;
 890         if (is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 891                                mac_addr))
 892                 return;
 893         /* Check the current MAC address on the remote */
 894         if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0)
 895                 return;
 896         if (!is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
 897                                mac_addr))
 898                 mode = LOCAL_AND_REMOTE;
 899         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
 900         rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETHER_ADDR_LEN);
 901         if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1, mode) < 0)
 902                 return;
 903         rte_memcpy(&pmd->eth_addr, mac_addr, ETHER_ADDR_LEN);
 904         if (pmd->remote_if_index && !pmd->flow_isolate) {
 905                 /* Replace MAC redirection rule after a MAC change */
 906                 if (tap_flow_implicit_destroy(pmd, TAP_REMOTE_LOCAL_MAC) < 0) {
 907                         RTE_LOG(ERR, PMD,
 908                                 "%s: Couldn't delete MAC redirection rule\n",
 909                                 dev->device->name);
 910                         return;
 911                 }
 912                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0)
 913                         RTE_LOG(ERR, PMD,
 914                                 "%s: Couldn't add MAC redirection rule\n",
 915                                 dev->device->name);
 916         }
 917 }
 918
 919 static int
 920 tap_setup_queue(struct rte_eth_dev *dev,
 921                 struct pmd_internals *internals,
 922                 uint16_t qid,
 923                 int is_rx)
 924 {
 925         int *fd;
 926         int *other_fd;
 927         const char *dir;
 928         struct pmd_internals *pmd = dev->data->dev_private;
 929         struct rx_queue *rx = &internals->rxq[qid];
 930         struct tx_queue *tx = &internals->txq[qid];
 931
 932         if (is_rx) {
 933                 fd = &rx->fd;
 934                 other_fd = &tx->fd;
 935                 dir = "rx";
 936         } else {
 937                 fd = &tx->fd;
 938                 other_fd = &rx->fd;
 939                 dir = "tx";
 940         }
 941         if (*fd != -1) {
 942                 /* fd for this queue already exists */
 943                 RTE_LOG(DEBUG, PMD, "%s: fd %d for %s queue qid %d exists\n",
 944                         pmd->name, *fd, dir, qid);
 945         } else if (*other_fd != -1) {
 946                 /* Only other_fd exists. dup it */
 947                 *fd = dup(*other_fd);
 948                 if (*fd < 0) {
 949                         *fd = -1;
 950                         RTE_LOG(ERR, PMD, "%s: dup() failed.\n",
 951                                 pmd->name);
 952                         return -1;
 953                 }
 954                 RTE_LOG(DEBUG, PMD, "%s: dup fd %d for %s queue qid %d (%d)\n",
 955                         pmd->name, *other_fd, dir, qid, *fd);
 956         } else {
 957                 /* Both RX and TX fds do not exist (equal -1). Create fd */
 958                 *fd = tun_alloc(pmd);
 959                 if (*fd < 0) {
 960                         *fd = -1; /* restore original value */
 961                         RTE_LOG(ERR, PMD, "%s: tun_alloc() failed.\n",
 962                                 pmd->name);
 963                         return -1;
 964                 }
 965                 RTE_LOG(DEBUG, PMD, "%s: add %s queue for qid %d fd %d\n",
 966                         pmd->name, dir, qid, *fd);
 967         }
 968
 969         tx->mtu = &dev->data->mtu;
 970         rx->rxmode = &dev->data->dev_conf.rxmode;
 971
 972         return *fd;
 973 }
 974
 975 static int
 976 tap_rx_queue_setup(struct rte_eth_dev *dev,
 977                    uint16_t rx_queue_id,
 978                    uint16_t nb_rx_desc,
 979                    unsigned int socket_id,
 980                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 981                    struct rte_mempool *mp)
 982 {
 983         struct pmd_internals *internals = dev->data->dev_private;
 984         struct rx_queue *rxq = &internals->rxq[rx_queue_id];
 985         struct rte_mbuf **tmp = &rxq->pool;
 986         long iov_max = sysconf(_SC_IOV_MAX);
 987         uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
 988         struct iovec (*iovecs)[nb_desc + 1];
 989         int data_off = RTE_PKTMBUF_HEADROOM;
 990         int ret = 0;
 991         int fd;
 992         int i;
 993
 994         if (rx_queue_id >= dev->data->nb_rx_queues || !mp) {
 995                 RTE_LOG(WARNING, PMD,
 996                         "nb_rx_queues %d too small or mempool NULL\n",
 997                         dev->data->nb_rx_queues);
 998                 return -1;
 999         }
1000
1001         rxq->mp = mp;
1002         rxq->trigger_seen = 1; /* force initial burst */
1003         rxq->in_port = dev->data->port_id;
1004         rxq->nb_rx_desc = nb_desc;
1005         iovecs = rte_zmalloc_socket(dev->device->name, sizeof(*iovecs), 0,
1006                                     socket_id);
1007         if (!iovecs) {
1008                 RTE_LOG(WARNING, PMD,
1009                         "%s: Couldn't allocate %d RX descriptors\n",
1010                         dev->device->name, nb_desc);
1011                 return -ENOMEM;
1012         }
1013         rxq->iovecs = iovecs;
1014
1015         dev->data->rx_queues[rx_queue_id] = rxq;
1016         fd = tap_setup_queue(dev, internals, rx_queue_id, 1);
1017         if (fd == -1) {
1018                 ret = fd;
1019                 goto error;
1020         }
1021
1022         (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
1023         (*rxq->iovecs)[0].iov_base = &rxq->pi;
1024
1025         for (i = 1; i <= nb_desc; i++) {
1026                 *tmp = rte_pktmbuf_alloc(rxq->mp);
1027                 if (!*tmp) {
1028                         RTE_LOG(WARNING, PMD,
1029                                 "%s: couldn't allocate memory for queue %d\n",
1030                                 dev->device->name, rx_queue_id);
1031                         ret = -ENOMEM;
1032                         goto error;
1033                 }
1034                 (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off;
1035                 (*rxq->iovecs)[i].iov_base =
1036                         (char *)(*tmp)->buf_addr + data_off;
1037                 data_off = 0;
1038                 tmp = &(*tmp)->next;
1039         }
1040
1041         RTE_LOG(DEBUG, PMD, "  RX TAP device name %s, qid %d on fd %d\n",
1042                 internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd);
1043
1044         return 0;
1045
1046 error:
1047         rte_pktmbuf_free(rxq->pool);
1048         rxq->pool = NULL;
1049         rte_free(rxq->iovecs);
1050         rxq->iovecs = NULL;
1051         return ret;
1052 }
1053
1054 static int
1055 tap_tx_queue_setup(struct rte_eth_dev *dev,
1056                    uint16_t tx_queue_id,
1057                    uint16_t nb_tx_desc __rte_unused,
1058                    unsigned int socket_id __rte_unused,
1059                    const struct rte_eth_txconf *tx_conf __rte_unused)
1060 {
1061         struct pmd_internals *internals = dev->data->dev_private;
1062         int ret;
1063
1064         if (tx_queue_id >= dev->data->nb_tx_queues)
1065                 return -1;
1066
1067         dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
1068         ret = tap_setup_queue(dev, internals, tx_queue_id, 0);
1069         if (ret == -1)
1070                 return -1;
1071
1072         RTE_LOG(DEBUG, PMD, "  TX TAP device name %s, qid %d on fd %d\n",
1073                 internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
1074
1075         return 0;
1076 }
1077
1078 static int
1079 tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
1080 {
1081         struct pmd_internals *pmd = dev->data->dev_private;
1082         struct ifreq ifr = { .ifr_mtu = mtu };
1083         int err = 0;
1084
1085         err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE);
1086         if (!err)
1087                 dev->data->mtu = mtu;
1088
1089         return err;
1090 }
1091
1092 static int
1093 tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
1094                      struct ether_addr *mc_addr_set __rte_unused,
1095                      uint32_t nb_mc_addr __rte_unused)
1096 {
1097         /*
1098          * Nothing to do actually: the tap has no filtering whatsoever, every
1099          * packet is received.
1100          */
1101         return 0;
1102 }
1103
1104 static int
1105 tap_nl_msg_handler(struct nlmsghdr *nh, void *arg)
1106 {
1107         struct rte_eth_dev *dev = arg;
1108         struct pmd_internals *pmd = dev->data->dev_private;
1109         struct ifinfomsg *info = NLMSG_DATA(nh);
1110
1111         if (nh->nlmsg_type != RTM_NEWLINK ||
1112             (info->ifi_index != pmd->if_index &&
1113              info->ifi_index != pmd->remote_if_index))
1114                 return 0;
1115         return tap_link_update(dev, 0);
1116 }
1117
1118 static void
1119 tap_dev_intr_handler(void *cb_arg)
1120 {
1121         struct rte_eth_dev *dev = cb_arg;
1122         struct pmd_internals *pmd = dev->data->dev_private;
1123
1124         nl_recv(pmd->intr_handle.fd, tap_nl_msg_handler, dev);
1125 }
1126
1127 static int
1128 tap_intr_handle_set(struct rte_eth_dev *dev, int set)
1129 {
1130         struct pmd_internals *pmd = dev->data->dev_private;
1131
1132         /* In any case, disable interrupt if the conf is no longer there. */
1133         if (!dev->data->dev_conf.intr_conf.lsc) {
1134                 if (pmd->intr_handle.fd != -1) {
1135                         nl_final(pmd->intr_handle.fd);
1136                         rte_intr_callback_unregister(&pmd->intr_handle,
1137                                 tap_dev_intr_handler, dev);
1138                 }
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_nodev;
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_nodev;
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_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         if (pmd->ioctl_sock > 0)
1422                 close(pmd->ioctl_sock);
1423         rte_eth_dev_release_port(dev);
1424
1425 error_exit_nodev:
1426         RTE_LOG(ERR, PMD, "TAP Unable to initialize %s\n",
1427                 rte_vdev_device_name(vdev));
1428
1429         rte_free(data);
1430         return -EINVAL;
1431 }
1432
1433 static int
1434 set_interface_name(const char *key __rte_unused,
1435                    const char *value,
1436                    void *extra_args)
1437 {
1438         char *name = (char *)extra_args;
1439
1440         if (value)
1441                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value);
1442         else
1443                 snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d",
1444                          DEFAULT_TAP_NAME, (tap_unit - 1));
1445
1446         return 0;
1447 }
1448
1449 static int
1450 set_interface_speed(const char *key __rte_unused,
1451                     const char *value,
1452                     void *extra_args)
1453 {
1454         *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G;
1455
1456         return 0;
1457 }
1458
1459 static int
1460 set_remote_iface(const char *key __rte_unused,
1461                  const char *value,
1462                  void *extra_args)
1463 {
1464         char *name = (char *)extra_args;
1465
1466         if (value)
1467                 snprintf(name, RTE_ETH_NAME_MAX_LEN, "%s", value);
1468
1469         return 0;
1470 }
1471
1472 static int
1473 set_mac_type(const char *key __rte_unused,
1474              const char *value,
1475              void *extra_args)
1476 {
1477         if (value &&
1478             !strncasecmp(ETH_TAP_MAC_FIXED, value, strlen(ETH_TAP_MAC_FIXED)))
1479                 *(int *)extra_args = 1;
1480         return 0;
1481 }
1482
1483 /* Open a TAP interface device.
1484  */
1485 static int
1486 rte_pmd_tap_probe(struct rte_vdev_device *dev)
1487 {
1488         const char *name, *params;
1489         int ret;
1490         struct rte_kvargs *kvlist = NULL;
1491         int speed;
1492         char tap_name[RTE_ETH_NAME_MAX_LEN];
1493         char remote_iface[RTE_ETH_NAME_MAX_LEN];
1494         int fixed_mac_type = 0;
1495
1496         name = rte_vdev_device_name(dev);
1497         params = rte_vdev_device_args(dev);
1498
1499         speed = ETH_SPEED_NUM_10G;
1500         snprintf(tap_name, sizeof(tap_name), "%s%d",
1501                  DEFAULT_TAP_NAME, tap_unit++);
1502         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
1503
1504         if (params && (params[0] != '\0')) {
1505                 RTE_LOG(DEBUG, PMD, "parameters (%s)\n", params);
1506
1507                 kvlist = rte_kvargs_parse(params, valid_arguments);
1508                 if (kvlist) {
1509                         if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) {
1510                                 ret = rte_kvargs_process(kvlist,
1511                                                          ETH_TAP_SPEED_ARG,
1512                                                          &set_interface_speed,
1513                                                          &speed);
1514                                 if (ret == -1)
1515                                         goto leave;
1516                         }
1517
1518                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
1519                                 ret = rte_kvargs_process(kvlist,
1520                                                          ETH_TAP_IFACE_ARG,
1521                                                          &set_interface_name,
1522                                                          tap_name);
1523                                 if (ret == -1)
1524                                         goto leave;
1525                         }
1526
1527                         if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) {
1528                                 ret = rte_kvargs_process(kvlist,
1529                                                          ETH_TAP_REMOTE_ARG,
1530                                                          &set_remote_iface,
1531                                                          remote_iface);
1532                                 if (ret == -1)
1533                                         goto leave;
1534                         }
1535
1536                         if (rte_kvargs_count(kvlist, ETH_TAP_MAC_ARG) == 1) {
1537                                 ret = rte_kvargs_process(kvlist,
1538                                                          ETH_TAP_MAC_ARG,
1539                                                          &set_mac_type,
1540                                                          &fixed_mac_type);
1541                                 if (ret == -1)
1542                                         goto leave;
1543                         }
1544                 }
1545         }
1546         pmd_link.link_speed = speed;
1547
1548         RTE_LOG(NOTICE, PMD, "Initializing pmd_tap for %s as %s\n",
1549                 name, tap_name);
1550
1551         ret = eth_dev_tap_create(dev, tap_name, remote_iface, fixed_mac_type);
1552
1553 leave:
1554         if (ret == -1) {
1555                 RTE_LOG(ERR, PMD, "Failed to create pmd for %s as %s\n",
1556                         name, tap_name);
1557                 tap_unit--;             /* Restore the unit number */
1558         }
1559         rte_kvargs_free(kvlist);
1560
1561         return ret;
1562 }
1563
1564 /* detach a TAP device.
1565  */
1566 static int
1567 rte_pmd_tap_remove(struct rte_vdev_device *dev)
1568 {
1569         struct rte_eth_dev *eth_dev = NULL;
1570         struct pmd_internals *internals;
1571         int i;
1572
1573         RTE_LOG(DEBUG, PMD, "Closing TUN/TAP Ethernet device on numa %u\n",
1574                 rte_socket_id());
1575
1576         /* find the ethdev entry */
1577         eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
1578         if (!eth_dev)
1579                 return 0;
1580
1581         internals = eth_dev->data->dev_private;
1582         if (internals->nlsk_fd) {
1583                 tap_flow_flush(eth_dev, NULL);
1584                 tap_flow_implicit_flush(internals, NULL);
1585                 nl_final(internals->nlsk_fd);
1586         }
1587         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1588                 if (internals->rxq[i].fd != -1) {
1589                         close(internals->rxq[i].fd);
1590                         internals->rxq[i].fd = -1;
1591                 }
1592                 if (internals->txq[i].fd != -1) {
1593                         close(internals->txq[i].fd);
1594                         internals->txq[i].fd = -1;
1595                 }
1596         }
1597
1598         close(internals->ioctl_sock);
1599         rte_free(eth_dev->data->dev_private);
1600         rte_free(eth_dev->data);
1601
1602         rte_eth_dev_release_port(eth_dev);
1603
1604         return 0;
1605 }
1606
1607 static struct rte_vdev_driver pmd_tap_drv = {
1608         .probe = rte_pmd_tap_probe,
1609         .remove = rte_pmd_tap_remove,
1610 };
1611 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
1612 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
1613 RTE_PMD_REGISTER_PARAM_STRING(net_tap,
1614                               ETH_TAP_IFACE_ARG "=<string> "
1615                               ETH_TAP_SPEED_ARG "=<int> "
1616                               ETH_TAP_MAC_ARG "=" ETH_TAP_MAC_FIXED " "
1617                               ETH_TAP_REMOTE_ARG "=<string>");