drivers/net/tap/rte_eth_tap.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2016-2017 Intel Corporation
   3  */
   4
   5 #include <rte_atomic.h>
   6 #include <rte_branch_prediction.h>
   7 #include <rte_byteorder.h>
   8 #include <rte_common.h>
   9 #include <rte_mbuf.h>
  10 #include <ethdev_driver.h>
  11 #include <ethdev_vdev.h>
  12 #include <rte_malloc.h>
  13 #include <rte_bus_vdev.h>
  14 #include <rte_kvargs.h>
  15 #include <rte_net.h>
  16 #include <rte_debug.h>
  17 #include <rte_ip.h>
  18 #include <rte_string_fns.h>
  19 #include <rte_ethdev.h>
  20 #include <rte_errno.h>
  21 #include <rte_cycles.h>
  22
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <sys/socket.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/utsname.h>
  28 #include <sys/mman.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31 #include <stdbool.h>
  32 #include <stdint.h>
  33 #include <sys/uio.h>
  34 #include <unistd.h>
  35 #include <arpa/inet.h>
  36 #include <net/if.h>
  37 #include <linux/if_tun.h>
  38 #include <linux/if_ether.h>
  39 #include <fcntl.h>
  40 #include <ctype.h>
  41
  42 #include <tap_rss.h>
  43 #include <rte_eth_tap.h>
  44 #include <tap_flow.h>
  45 #include <tap_netlink.h>
  46 #include <tap_tcmsgs.h>
  47
  48 /* Linux based path to the TUN device */
  49 #define TUN_TAP_DEV_PATH        "/dev/net/tun"
  50 #define DEFAULT_TAP_NAME        "dtap"
  51 #define DEFAULT_TUN_NAME        "dtun"
  52
  53 #define ETH_TAP_IFACE_ARG       "iface"
  54 #define ETH_TAP_REMOTE_ARG      "remote"
  55 #define ETH_TAP_MAC_ARG         "mac"
  56 #define ETH_TAP_MAC_FIXED       "fixed"
  57
  58 #define ETH_TAP_USR_MAC_FMT     "xx:xx:xx:xx:xx:xx"
  59 #define ETH_TAP_CMP_MAC_FMT     "0123456789ABCDEFabcdef"
  60 #define ETH_TAP_MAC_ARG_FMT     ETH_TAP_MAC_FIXED "|" ETH_TAP_USR_MAC_FMT
  61
  62 #define TAP_GSO_MBUFS_PER_CORE  128
  63 #define TAP_GSO_MBUF_SEG_SIZE   128
  64 #define TAP_GSO_MBUF_CACHE_SIZE 4
  65 #define TAP_GSO_MBUFS_NUM \
  66         (TAP_GSO_MBUFS_PER_CORE * TAP_GSO_MBUF_CACHE_SIZE)
  67
  68 /* IPC key for queue fds sync */
  69 #define TAP_MP_KEY "tap_mp_sync_queues"
  70
  71 #define TAP_IOV_DEFAULT_MAX 1024
  72
  73 #define TAP_RX_OFFLOAD (DEV_RX_OFFLOAD_SCATTER |        \
  74                         DEV_RX_OFFLOAD_IPV4_CKSUM |     \
  75                         DEV_RX_OFFLOAD_UDP_CKSUM |      \
  76                         DEV_RX_OFFLOAD_TCP_CKSUM)
  77
  78 #define TAP_TX_OFFLOAD (DEV_TX_OFFLOAD_MULTI_SEGS |     \
  79                         DEV_TX_OFFLOAD_IPV4_CKSUM |     \
  80                         DEV_TX_OFFLOAD_UDP_CKSUM |      \
  81                         DEV_TX_OFFLOAD_TCP_CKSUM |      \
  82                         DEV_TX_OFFLOAD_TCP_TSO)
  83
  84 static int tap_devices_count;
  85
  86 static const char *tuntap_types[ETH_TUNTAP_TYPE_MAX] = {
  87         "UNKNOWN", "TUN", "TAP"
  88 };
  89
  90 static const char *valid_arguments[] = {
  91         ETH_TAP_IFACE_ARG,
  92         ETH_TAP_REMOTE_ARG,
  93         ETH_TAP_MAC_ARG,
  94         NULL
  95 };
  96
  97 static volatile uint32_t tap_trigger;   /* Rx trigger */
  98
  99 static struct rte_eth_link pmd_link = {
 100         .link_speed = ETH_SPEED_NUM_10G,
 101         .link_duplex = ETH_LINK_FULL_DUPLEX,
 102         .link_status = ETH_LINK_DOWN,
 103         .link_autoneg = ETH_LINK_FIXED,
 104 };
 105
 106 static void
 107 tap_trigger_cb(int sig __rte_unused)
 108 {
 109         /* Valid trigger values are nonzero */
 110         tap_trigger = (tap_trigger + 1) | 0x80000000;
 111 }
 112
 113 /* Specifies on what netdevices the ioctl should be applied */
 114 enum ioctl_mode {
 115         LOCAL_AND_REMOTE,
 116         LOCAL_ONLY,
 117         REMOTE_ONLY,
 118 };
 119
 120 /* Message header to synchronize queues via IPC */
 121 struct ipc_queues {
 122         char port_name[RTE_DEV_NAME_MAX_LEN];
 123         int rxq_count;
 124         int txq_count;
 125         /*
 126          * The file descriptors are in the dedicated part
 127          * of the Unix message to be translated by the kernel.
 128          */
 129 };
 130
 131 static int tap_intr_handle_set(struct rte_eth_dev *dev, int set);
 132
 133 /**
 134  * Tun/Tap allocation routine
 135  *
 136  * @param[in] pmd
 137  *   Pointer to private structure.
 138  *
 139  * @param[in] is_keepalive
 140  *   Keepalive flag
 141  *
 142  * @return
 143  *   -1 on failure, fd on success
 144  */
 145 static int
 146 tun_alloc(struct pmd_internals *pmd, int is_keepalive)
 147 {
 148         struct ifreq ifr;
 149 #ifdef IFF_MULTI_QUEUE
 150         unsigned int features;
 151 #endif
 152         int fd, signo, flags;
 153
 154         memset(&ifr, 0, sizeof(struct ifreq));
 155
 156         /*
 157          * Do not set IFF_NO_PI as packet information header will be needed
 158          * to check if a received packet has been truncated.
 159          */
 160         ifr.ifr_flags = (pmd->type == ETH_TUNTAP_TYPE_TAP) ?
 161                 IFF_TAP : IFF_TUN | IFF_POINTOPOINT;
 162         strlcpy(ifr.ifr_name, pmd->name, IFNAMSIZ);
 163
 164         fd = open(TUN_TAP_DEV_PATH, O_RDWR);
 165         if (fd < 0) {
 166                 TAP_LOG(ERR, "Unable to open %s interface", TUN_TAP_DEV_PATH);
 167                 goto error;
 168         }
 169
 170 #ifdef IFF_MULTI_QUEUE
 171         /* Grab the TUN features to verify we can work multi-queue */
 172         if (ioctl(fd, TUNGETFEATURES, &features) < 0) {
 173                 TAP_LOG(ERR, "unable to get TUN/TAP features");
 174                 goto error;
 175         }
 176         TAP_LOG(DEBUG, "%s Features %08x", TUN_TAP_DEV_PATH, features);
 177
 178         if (features & IFF_MULTI_QUEUE) {
 179                 TAP_LOG(DEBUG, "  Multi-queue support for %d queues",
 180                         RTE_PMD_TAP_MAX_QUEUES);
 181                 ifr.ifr_flags |= IFF_MULTI_QUEUE;
 182         } else
 183 #endif
 184         {
 185                 ifr.ifr_flags |= IFF_ONE_QUEUE;
 186                 TAP_LOG(DEBUG, "  Single queue only support");
 187         }
 188
 189         /* Set the TUN/TAP configuration and set the name if needed */
 190         if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
 191                 TAP_LOG(WARNING, "Unable to set TUNSETIFF for %s: %s",
 192                         ifr.ifr_name, strerror(errno));
 193                 goto error;
 194         }
 195
 196         /*
 197          * Name passed to kernel might be wildcard like dtun%d
 198          * and need to find the resulting device.
 199          */
 200         TAP_LOG(DEBUG, "Device name is '%s'", ifr.ifr_name);
 201         strlcpy(pmd->name, ifr.ifr_name, RTE_ETH_NAME_MAX_LEN);
 202
 203         if (is_keepalive) {
 204                 /*
 205                  * Detach the TUN/TAP keep-alive queue
 206                  * to avoid traffic through it
 207                  */
 208                 ifr.ifr_flags = IFF_DETACH_QUEUE;
 209                 if (ioctl(fd, TUNSETQUEUE, (void *)&ifr) < 0) {
 210                         TAP_LOG(WARNING,
 211                                 "Unable to detach keep-alive queue for %s: %s",
 212                                 ifr.ifr_name, strerror(errno));
 213                         goto error;
 214                 }
 215         }
 216
 217         flags = fcntl(fd, F_GETFL);
 218         if (flags == -1) {
 219                 TAP_LOG(WARNING,
 220                         "Unable to get %s current flags\n",
 221                         ifr.ifr_name);
 222                 goto error;
 223         }
 224
 225         /* Always set the file descriptor to non-blocking */
 226         flags |= O_NONBLOCK;
 227         if (fcntl(fd, F_SETFL, flags) < 0) {
 228                 TAP_LOG(WARNING,
 229                         "Unable to set %s to nonblocking: %s",
 230                         ifr.ifr_name, strerror(errno));
 231                 goto error;
 232         }
 233
 234         /* Find a free realtime signal */
 235         for (signo = SIGRTMIN + 1; signo < SIGRTMAX; signo++) {
 236                 struct sigaction sa;
 237
 238                 if (sigaction(signo, NULL, &sa) == -1) {
 239                         TAP_LOG(WARNING,
 240                                 "Unable to get current rt-signal %d handler",
 241                                 signo);
 242                         goto error;
 243                 }
 244
 245                 /* Already have the handler we want on this signal  */
 246                 if (sa.sa_handler == tap_trigger_cb)
 247                         break;
 248
 249                 /* Is handler in use by application */
 250                 if (sa.sa_handler != SIG_DFL) {
 251                         TAP_LOG(DEBUG,
 252                                 "Skipping used rt-signal %d", signo);
 253                         continue;
 254                 }
 255
 256                 sa = (struct sigaction) {
 257                         .sa_flags = SA_RESTART,
 258                         .sa_handler = tap_trigger_cb,
 259                 };
 260
 261                 if (sigaction(signo, &sa, NULL) == -1) {
 262                         TAP_LOG(WARNING,
 263                                 "Unable to set rt-signal %d handler\n", signo);
 264                         goto error;
 265                 }
 266
 267                 /* Found a good signal to use */
 268                 TAP_LOG(DEBUG,
 269                         "Using rt-signal %d", signo);
 270                 break;
 271         }
 272
 273         if (signo == SIGRTMAX) {
 274                 TAP_LOG(WARNING, "All rt-signals are in use\n");
 275
 276                 /* Disable trigger globally in case of error */
 277                 tap_trigger = 0;
 278                 TAP_LOG(NOTICE, "No Rx trigger signal available\n");
 279         } else {
 280                 /* Enable signal on file descriptor */
 281                 if (fcntl(fd, F_SETSIG, signo) < 0) {
 282                         TAP_LOG(WARNING, "Unable to set signo %d for fd %d: %s",
 283                                 signo, fd, strerror(errno));
 284                         goto error;
 285                 }
 286                 if (fcntl(fd, F_SETFL, flags | O_ASYNC) < 0) {
 287                         TAP_LOG(WARNING, "Unable to set fcntl flags: %s",
 288                                 strerror(errno));
 289                         goto error;
 290                 }
 291
 292                 if (fcntl(fd, F_SETOWN, getpid()) < 0) {
 293                         TAP_LOG(WARNING, "Unable to set fcntl owner: %s",
 294                                 strerror(errno));
 295                         goto error;
 296                 }
 297         }
 298         return fd;
 299
 300 error:
 301         if (fd >= 0)
 302                 close(fd);
 303         return -1;
 304 }
 305
 306 static void
 307 tap_verify_csum(struct rte_mbuf *mbuf)
 308 {
 309         uint32_t l2 = mbuf->packet_type & RTE_PTYPE_L2_MASK;
 310         uint32_t l3 = mbuf->packet_type & RTE_PTYPE_L3_MASK;
 311         uint32_t l4 = mbuf->packet_type & RTE_PTYPE_L4_MASK;
 312         unsigned int l2_len = sizeof(struct rte_ether_hdr);
 313         unsigned int l3_len;
 314         uint16_t cksum = 0;
 315         void *l3_hdr;
 316         void *l4_hdr;
 317         struct rte_udp_hdr *udp_hdr;
 318
 319         if (l2 == RTE_PTYPE_L2_ETHER_VLAN)
 320                 l2_len += 4;
 321         else if (l2 == RTE_PTYPE_L2_ETHER_QINQ)
 322                 l2_len += 8;
 323         /* Don't verify checksum for packets with discontinuous L2 header */
 324         if (unlikely(l2_len + sizeof(struct rte_ipv4_hdr) >
 325                      rte_pktmbuf_data_len(mbuf)))
 326                 return;
 327         l3_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len);
 328         if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
 329                 struct rte_ipv4_hdr *iph = l3_hdr;
 330
 331                 l3_len = rte_ipv4_hdr_len(iph);
 332                 if (unlikely(l2_len + l3_len > rte_pktmbuf_data_len(mbuf)))
 333                         return;
 334                 /* check that the total length reported by header is not
 335                  * greater than the total received size
 336                  */
 337                 if (l2_len + rte_be_to_cpu_16(iph->total_length) >
 338                                 rte_pktmbuf_data_len(mbuf))
 339                         return;
 340
 341                 cksum = ~rte_raw_cksum(iph, l3_len);
 342                 mbuf->ol_flags |= cksum ?
 343                         PKT_RX_IP_CKSUM_BAD :
 344                         PKT_RX_IP_CKSUM_GOOD;
 345         } else if (l3 == RTE_PTYPE_L3_IPV6) {
 346                 struct rte_ipv6_hdr *iph = l3_hdr;
 347
 348                 l3_len = sizeof(struct rte_ipv6_hdr);
 349                 /* check that the total length reported by header is not
 350                  * greater than the total received size
 351                  */
 352                 if (l2_len + l3_len + rte_be_to_cpu_16(iph->payload_len) >
 353                                 rte_pktmbuf_data_len(mbuf))
 354                         return;
 355         } else {
 356                 /* - RTE_PTYPE_L3_IPV4_EXT_UNKNOWN cannot happen because
 357                  *   mbuf->packet_type is filled by rte_net_get_ptype() which
 358                  *   never returns this value.
 359                  * - IPv6 extensions are not supported.
 360                  */
 361                 return;
 362         }
 363         if (l4 == RTE_PTYPE_L4_UDP || l4 == RTE_PTYPE_L4_TCP) {
 364                 int cksum_ok;
 365
 366                 l4_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len + l3_len);
 367                 /* Don't verify checksum for multi-segment packets. */
 368                 if (mbuf->nb_segs > 1)
 369                         return;
 370                 if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
 371                         if (l4 == RTE_PTYPE_L4_UDP) {
 372                                 udp_hdr = (struct rte_udp_hdr *)l4_hdr;
 373                                 if (udp_hdr->dgram_cksum == 0) {
 374                                         /*
 375                                          * For IPv4, a zero UDP checksum
 376                                          * indicates that the sender did not
 377                                          * generate one [RFC 768].
 378                                          */
 379                                         mbuf->ol_flags |= PKT_RX_L4_CKSUM_NONE;
 380                                         return;
 381                                 }
 382                         }
 383                         cksum_ok = !rte_ipv4_udptcp_cksum_verify(l3_hdr,
 384                                                                  l4_hdr);
 385                 } else { /* l3 == RTE_PTYPE_L3_IPV6, checked above */
 386                         cksum_ok = !rte_ipv6_udptcp_cksum_verify(l3_hdr,
 387                                                                  l4_hdr);
 388                 }
 389                 mbuf->ol_flags |= cksum_ok ?
 390                         PKT_RX_L4_CKSUM_GOOD : PKT_RX_L4_CKSUM_BAD;
 391         }
 392 }
 393
 394 static void
 395 tap_rxq_pool_free(struct rte_mbuf *pool)
 396 {
 397         struct rte_mbuf *mbuf = pool;
 398         uint16_t nb_segs = 1;
 399
 400         if (mbuf == NULL)
 401                 return;
 402
 403         while (mbuf->next) {
 404                 mbuf = mbuf->next;
 405                 nb_segs++;
 406         }
 407         pool->nb_segs = nb_segs;
 408         rte_pktmbuf_free(pool);
 409 }
 410
 411 /* Callback to handle the rx burst of packets to the correct interface and
 412  * file descriptor(s) in a multi-queue setup.
 413  */
 414 static uint16_t
 415 pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 416 {
 417         struct rx_queue *rxq = queue;
 418         struct pmd_process_private *process_private;
 419         uint16_t num_rx;
 420         unsigned long num_rx_bytes = 0;
 421         uint32_t trigger = tap_trigger;
 422
 423         if (trigger == rxq->trigger_seen)
 424                 return 0;
 425
 426         process_private = rte_eth_devices[rxq->in_port].process_private;
 427         for (num_rx = 0; num_rx < nb_pkts; ) {
 428                 struct rte_mbuf *mbuf = rxq->pool;
 429                 struct rte_mbuf *seg = NULL;
 430                 struct rte_mbuf *new_tail = NULL;
 431                 uint16_t data_off = rte_pktmbuf_headroom(mbuf);
 432                 int len;
 433
 434                 len = readv(process_private->rxq_fds[rxq->queue_id],
 435                         *rxq->iovecs,
 436                         1 + (rxq->rxmode->offloads & DEV_RX_OFFLOAD_SCATTER ?
 437                              rxq->nb_rx_desc : 1));
 438                 if (len < (int)sizeof(struct tun_pi))
 439                         break;
 440
 441                 /* Packet couldn't fit in the provided mbuf */
 442                 if (unlikely(rxq->pi.flags & TUN_PKT_STRIP)) {
 443                         rxq->stats.ierrors++;
 444                         continue;
 445                 }
 446
 447                 len -= sizeof(struct tun_pi);
 448
 449                 mbuf->pkt_len = len;
 450                 mbuf->port = rxq->in_port;
 451                 while (1) {
 452                         struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp);
 453
 454                         if (unlikely(!buf)) {
 455                                 rxq->stats.rx_nombuf++;
 456                                 /* No new buf has been allocated: do nothing */
 457                                 if (!new_tail || !seg)
 458                                         goto end;
 459
 460                                 seg->next = NULL;
 461                                 tap_rxq_pool_free(mbuf);
 462
 463                                 goto end;
 464                         }
 465                         seg = seg ? seg->next : mbuf;
 466                         if (rxq->pool == mbuf)
 467                                 rxq->pool = buf;
 468                         if (new_tail)
 469                                 new_tail->next = buf;
 470                         new_tail = buf;
 471                         new_tail->next = seg->next;
 472
 473                         /* iovecs[0] is reserved for packet info (pi) */
 474                         (*rxq->iovecs)[mbuf->nb_segs].iov_len =
 475                                 buf->buf_len - data_off;
 476                         (*rxq->iovecs)[mbuf->nb_segs].iov_base =
 477                                 (char *)buf->buf_addr + data_off;
 478
 479                         seg->data_len = RTE_MIN(seg->buf_len - data_off, len);
 480                         seg->data_off = data_off;
 481
 482                         len -= seg->data_len;
 483                         if (len <= 0)
 484                                 break;
 485                         mbuf->nb_segs++;
 486                         /* First segment has headroom, not the others */
 487                         data_off = 0;
 488                 }
 489                 seg->next = NULL;
 490                 mbuf->packet_type = rte_net_get_ptype(mbuf, NULL,
 491                                                       RTE_PTYPE_ALL_MASK);
 492                 if (rxq->rxmode->offloads & DEV_RX_OFFLOAD_CHECKSUM)
 493                         tap_verify_csum(mbuf);
 494
 495                 /* account for the receive frame */
 496                 bufs[num_rx++] = mbuf;
 497                 num_rx_bytes += mbuf->pkt_len;
 498         }
 499 end:
 500         rxq->stats.ipackets += num_rx;
 501         rxq->stats.ibytes += num_rx_bytes;
 502
 503         if (trigger && num_rx < nb_pkts)
 504                 rxq->trigger_seen = trigger;
 505
 506         return num_rx;
 507 }
 508
 509 /* Finalize l4 checksum calculation */
 510 static void
 511 tap_tx_l4_cksum(uint16_t *l4_cksum, uint16_t l4_phdr_cksum,
 512                 uint32_t l4_raw_cksum)
 513 {
 514         if (l4_cksum) {
 515                 uint32_t cksum;
 516
 517                 cksum = __rte_raw_cksum_reduce(l4_raw_cksum);
 518                 cksum += l4_phdr_cksum;
 519
 520                 cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
 521                 cksum = (~cksum) & 0xffff;
 522                 if (cksum == 0)
 523                         cksum = 0xffff;
 524                 *l4_cksum = cksum;
 525         }
 526 }
 527
 528 /* Accumaulate L4 raw checksums */
 529 static void
 530 tap_tx_l4_add_rcksum(char *l4_data, unsigned int l4_len, uint16_t *l4_cksum,
 531                         uint32_t *l4_raw_cksum)
 532 {
 533         if (l4_cksum == NULL)
 534                 return;
 535
 536         *l4_raw_cksum = __rte_raw_cksum(l4_data, l4_len, *l4_raw_cksum);
 537 }
 538
 539 /* L3 and L4 pseudo headers checksum offloads */
 540 static void
 541 tap_tx_l3_cksum(char *packet, uint64_t ol_flags, unsigned int l2_len,
 542                 unsigned int l3_len, unsigned int l4_len, uint16_t **l4_cksum,
 543                 uint16_t *l4_phdr_cksum, uint32_t *l4_raw_cksum)
 544 {
 545         void *l3_hdr = packet + l2_len;
 546
 547         if (ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4)) {
 548                 struct rte_ipv4_hdr *iph = l3_hdr;
 549                 uint16_t cksum;
 550
 551                 iph->hdr_checksum = 0;
 552                 cksum = rte_raw_cksum(iph, l3_len);
 553                 iph->hdr_checksum = (cksum == 0xffff) ? cksum : ~cksum;
 554         }
 555         if (ol_flags & PKT_TX_L4_MASK) {
 556                 void *l4_hdr;
 557
 558                 l4_hdr = packet + l2_len + l3_len;
 559                 if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM)
 560                         *l4_cksum = &((struct rte_udp_hdr *)l4_hdr)->dgram_cksum;
 561                 else if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM)
 562                         *l4_cksum = &((struct rte_tcp_hdr *)l4_hdr)->cksum;
 563                 else
 564                         return;
 565                 **l4_cksum = 0;
 566                 if (ol_flags & PKT_TX_IPV4)
 567                         *l4_phdr_cksum = rte_ipv4_phdr_cksum(l3_hdr, 0);
 568                 else
 569                         *l4_phdr_cksum = rte_ipv6_phdr_cksum(l3_hdr, 0);
 570                 *l4_raw_cksum = __rte_raw_cksum(l4_hdr, l4_len, 0);
 571         }
 572 }
 573
 574 static inline int
 575 tap_write_mbufs(struct tx_queue *txq, uint16_t num_mbufs,
 576                         struct rte_mbuf **pmbufs,
 577                         uint16_t *num_packets, unsigned long *num_tx_bytes)
 578 {
 579         int i;
 580         uint16_t l234_hlen;
 581         struct pmd_process_private *process_private;
 582
 583         process_private = rte_eth_devices[txq->out_port].process_private;
 584
 585         for (i = 0; i < num_mbufs; i++) {
 586                 struct rte_mbuf *mbuf = pmbufs[i];
 587                 struct iovec iovecs[mbuf->nb_segs + 2];
 588                 struct tun_pi pi = { .flags = 0, .proto = 0x00 };
 589                 struct rte_mbuf *seg = mbuf;
 590                 char m_copy[mbuf->data_len];
 591                 int proto;
 592                 int n;
 593                 int j;
 594                 int k; /* current index in iovecs for copying segments */
 595                 uint16_t seg_len; /* length of first segment */
 596                 uint16_t nb_segs;
 597                 uint16_t *l4_cksum; /* l4 checksum (pseudo header + payload) */
 598                 uint32_t l4_raw_cksum = 0; /* TCP/UDP payload raw checksum */
 599                 uint16_t l4_phdr_cksum = 0; /* TCP/UDP pseudo header checksum */
 600                 uint16_t is_cksum = 0; /* in case cksum should be offloaded */
 601
 602                 l4_cksum = NULL;
 603                 if (txq->type == ETH_TUNTAP_TYPE_TUN) {
 604                         /*
 605                          * TUN and TAP are created with IFF_NO_PI disabled.
 606                          * For TUN PMD this mandatory as fields are used by
 607                          * Kernel tun.c to determine whether its IP or non IP
 608                          * packets.
 609                          *
 610                          * The logic fetches the first byte of data from mbuf
 611                          * then compares whether its v4 or v6. If first byte
 612                          * is 4 or 6, then protocol field is updated.
 613                          */
 614                         char *buff_data = rte_pktmbuf_mtod(seg, void *);
 615                         proto = (*buff_data & 0xf0);
 616                         pi.proto = (proto == 0x40) ?
 617                                 rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV4) :
 618                                 ((proto == 0x60) ?
 619                                         rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV6) :
 620                                         0x00);
 621                 }
 622
 623                 k = 0;
 624                 iovecs[k].iov_base = &pi;
 625                 iovecs[k].iov_len = sizeof(pi);
 626                 k++;
 627
 628                 nb_segs = mbuf->nb_segs;
 629                 if (txq->csum &&
 630                     ((mbuf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4) ||
 631                      (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM ||
 632                      (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM))) {
 633                         is_cksum = 1;
 634
 635                         /* Support only packets with at least layer 4
 636                          * header included in the first segment
 637                          */
 638                         seg_len = rte_pktmbuf_data_len(mbuf);
 639                         l234_hlen = mbuf->l2_len + mbuf->l3_len + mbuf->l4_len;
 640                         if (seg_len < l234_hlen)
 641                                 return -1;
 642
 643                         /* To change checksums, work on a * copy of l2, l3
 644                          * headers + l4 pseudo header
 645                          */
 646                         rte_memcpy(m_copy, rte_pktmbuf_mtod(mbuf, void *),
 647                                         l234_hlen);
 648                         tap_tx_l3_cksum(m_copy, mbuf->ol_flags,
 649                                        mbuf->l2_len, mbuf->l3_len, mbuf->l4_len,
 650                                        &l4_cksum, &l4_phdr_cksum,
 651                                        &l4_raw_cksum);
 652                         iovecs[k].iov_base = m_copy;
 653                         iovecs[k].iov_len = l234_hlen;
 654                         k++;
 655
 656                         /* Update next iovecs[] beyond l2, l3, l4 headers */
 657                         if (seg_len > l234_hlen) {
 658                                 iovecs[k].iov_len = seg_len - l234_hlen;
 659                                 iovecs[k].iov_base =
 660                                         rte_pktmbuf_mtod(seg, char *) +
 661                                                 l234_hlen;
 662                                 tap_tx_l4_add_rcksum(iovecs[k].iov_base,
 663                                         iovecs[k].iov_len, l4_cksum,
 664                                         &l4_raw_cksum);
 665                                 k++;
 666                                 nb_segs++;
 667                         }
 668                         seg = seg->next;
 669                 }
 670
 671                 for (j = k; j <= nb_segs; j++) {
 672                         iovecs[j].iov_len = rte_pktmbuf_data_len(seg);
 673                         iovecs[j].iov_base = rte_pktmbuf_mtod(seg, void *);
 674                         if (is_cksum)
 675                                 tap_tx_l4_add_rcksum(iovecs[j].iov_base,
 676                                         iovecs[j].iov_len, l4_cksum,
 677                                         &l4_raw_cksum);
 678                         seg = seg->next;
 679                 }
 680
 681                 if (is_cksum)
 682                         tap_tx_l4_cksum(l4_cksum, l4_phdr_cksum, l4_raw_cksum);
 683
 684                 /* copy the tx frame data */
 685                 n = writev(process_private->txq_fds[txq->queue_id], iovecs, j);
 686                 if (n <= 0)
 687                         return -1;
 688
 689                 (*num_packets)++;
 690                 (*num_tx_bytes) += rte_pktmbuf_pkt_len(mbuf);
 691         }
 692         return 0;
 693 }
 694
 695 /* Callback to handle sending packets from the tap interface
 696  */
 697 static uint16_t
 698 pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 699 {
 700         struct tx_queue *txq = queue;
 701         uint16_t num_tx = 0;
 702         uint16_t num_packets = 0;
 703         unsigned long num_tx_bytes = 0;
 704         uint32_t max_size;
 705         int i;
 706
 707         if (unlikely(nb_pkts == 0))
 708                 return 0;
 709
 710         struct rte_mbuf *gso_mbufs[MAX_GSO_MBUFS];
 711         max_size = *txq->mtu + (RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + 4);
 712         for (i = 0; i < nb_pkts; i++) {
 713                 struct rte_mbuf *mbuf_in = bufs[num_tx];
 714                 struct rte_mbuf **mbuf;
 715                 uint16_t num_mbufs = 0;
 716                 uint16_t tso_segsz = 0;
 717                 int ret;
 718                 int num_tso_mbufs;
 719                 uint16_t hdrs_len;
 720                 uint64_t tso;
 721
 722                 tso = mbuf_in->ol_flags & PKT_TX_TCP_SEG;
 723                 if (tso) {
 724                         struct rte_gso_ctx *gso_ctx = &txq->gso_ctx;
 725
 726                         /* TCP segmentation implies TCP checksum offload */
 727                         mbuf_in->ol_flags |= PKT_TX_TCP_CKSUM;
 728
 729                         /* gso size is calculated without RTE_ETHER_CRC_LEN */
 730                         hdrs_len = mbuf_in->l2_len + mbuf_in->l3_len +
 731                                         mbuf_in->l4_len;
 732                         tso_segsz = mbuf_in->tso_segsz + hdrs_len;
 733                         if (unlikely(tso_segsz == hdrs_len) ||
 734                                 tso_segsz > *txq->mtu) {
 735                                 txq->stats.errs++;
 736                                 break;
 737                         }
 738                         gso_ctx->gso_size = tso_segsz;
 739                         /* 'mbuf_in' packet to segment */
 740                         num_tso_mbufs = rte_gso_segment(mbuf_in,
 741                                 gso_ctx, /* gso control block */
 742                                 (struct rte_mbuf **)&gso_mbufs, /* out mbufs */
 743                                 RTE_DIM(gso_mbufs)); /* max tso mbufs */
 744
 745                         /* ret contains the number of new created mbufs */
 746                         if (num_tso_mbufs < 0)
 747                                 break;
 748
 749                         if (num_tso_mbufs >= 1) {
 750                                 mbuf = gso_mbufs;
 751                                 num_mbufs = num_tso_mbufs;
 752                         } else {
 753                                 /* 0 means it can be transmitted directly
 754                                  * without gso.
 755                                  */
 756                                 mbuf = &mbuf_in;
 757                                 num_mbufs = 1;
 758                         }
 759                 } else {
 760                         /* stats.errs will be incremented */
 761                         if (rte_pktmbuf_pkt_len(mbuf_in) > max_size)
 762                                 break;
 763
 764                         /* ret 0 indicates no new mbufs were created */
 765                         num_tso_mbufs = 0;
 766                         mbuf = &mbuf_in;
 767                         num_mbufs = 1;
 768                 }
 769
 770                 ret = tap_write_mbufs(txq, num_mbufs, mbuf,
 771                                 &num_packets, &num_tx_bytes);
 772                 if (ret == -1) {
 773                         txq->stats.errs++;
 774                         /* free tso mbufs */
 775                         if (num_tso_mbufs > 0)
 776                                 rte_pktmbuf_free_bulk(mbuf, num_tso_mbufs);
 777                         break;
 778                 }
 779                 num_tx++;
 780                 /* free original mbuf */
 781                 rte_pktmbuf_free(mbuf_in);
 782                 /* free tso mbufs */
 783                 if (num_tso_mbufs > 0)
 784                         rte_pktmbuf_free_bulk(mbuf, num_tso_mbufs);
 785         }
 786
 787         txq->stats.opackets += num_packets;
 788         txq->stats.errs += nb_pkts - num_tx;
 789         txq->stats.obytes += num_tx_bytes;
 790
 791         return num_tx;
 792 }
 793
 794 static const char *
 795 tap_ioctl_req2str(unsigned long request)
 796 {
 797         switch (request) {
 798         case SIOCSIFFLAGS:
 799                 return "SIOCSIFFLAGS";
 800         case SIOCGIFFLAGS:
 801                 return "SIOCGIFFLAGS";
 802         case SIOCGIFHWADDR:
 803                 return "SIOCGIFHWADDR";
 804         case SIOCSIFHWADDR:
 805                 return "SIOCSIFHWADDR";
 806         case SIOCSIFMTU:
 807                 return "SIOCSIFMTU";
 808         }
 809         return "UNKNOWN";
 810 }
 811
 812 static int
 813 tap_ioctl(struct pmd_internals *pmd, unsigned long request,
 814           struct ifreq *ifr, int set, enum ioctl_mode mode)
 815 {
 816         short req_flags = ifr->ifr_flags;
 817         int remote = pmd->remote_if_index &&
 818                 (mode == REMOTE_ONLY || mode == LOCAL_AND_REMOTE);
 819
 820         if (!pmd->remote_if_index && mode == REMOTE_ONLY)
 821                 return 0;
 822         /*
 823          * If there is a remote netdevice, apply ioctl on it, then apply it on
 824          * the tap netdevice.
 825          */
 826 apply:
 827         if (remote)
 828                 strlcpy(ifr->ifr_name, pmd->remote_iface, IFNAMSIZ);
 829         else if (mode == LOCAL_ONLY || mode == LOCAL_AND_REMOTE)
 830                 strlcpy(ifr->ifr_name, pmd->name, IFNAMSIZ);
 831         switch (request) {
 832         case SIOCSIFFLAGS:
 833                 /* fetch current flags to leave other flags untouched */
 834                 if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
 835                         goto error;
 836                 if (set)
 837                         ifr->ifr_flags |= req_flags;
 838                 else
 839                         ifr->ifr_flags &= ~req_flags;
 840                 break;
 841         case SIOCGIFFLAGS:
 842         case SIOCGIFHWADDR:
 843         case SIOCSIFHWADDR:
 844         case SIOCSIFMTU:
 845                 break;
 846         default:
 847                 TAP_LOG(WARNING, "%s: ioctl() called with wrong arg",
 848                         pmd->name);
 849                 return -EINVAL;
 850         }
 851         if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
 852                 goto error;
 853         if (remote-- && mode == LOCAL_AND_REMOTE)
 854                 goto apply;
 855         return 0;
 856
 857 error:
 858         TAP_LOG(DEBUG, "%s(%s) failed: %s(%d)", ifr->ifr_name,
 859                 tap_ioctl_req2str(request), strerror(errno), errno);
 860         return -errno;
 861 }
 862
 863 static int
 864 tap_link_set_down(struct rte_eth_dev *dev)
 865 {
 866         struct pmd_internals *pmd = dev->data->dev_private;
 867         struct ifreq ifr = { .ifr_flags = IFF_UP };
 868
 869         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 870         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_ONLY);
 871 }
 872
 873 static int
 874 tap_link_set_up(struct rte_eth_dev *dev)
 875 {
 876         struct pmd_internals *pmd = dev->data->dev_private;
 877         struct ifreq ifr = { .ifr_flags = IFF_UP };
 878
 879         dev->data->dev_link.link_status = ETH_LINK_UP;
 880         return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
 881 }
 882
 883 static int
 884 tap_dev_start(struct rte_eth_dev *dev)
 885 {
 886         int err, i;
 887
 888         err = tap_intr_handle_set(dev, 1);
 889         if (err)
 890                 return err;
 891
 892         err = tap_link_set_up(dev);
 893         if (err)
 894                 return err;
 895
 896         for (i = 0; i < dev->data->nb_tx_queues; i++)
 897                 dev->data->tx_queue_state[i] = RTE_ETH_QUEUE_STATE_STARTED;
 898         for (i = 0; i < dev->data->nb_rx_queues; i++)
 899                 dev->data->rx_queue_state[i] = RTE_ETH_QUEUE_STATE_STARTED;
 900
 901         return err;
 902 }
 903
 904 /* This function gets called when the current port gets stopped.
 905  */
 906 static int
 907 tap_dev_stop(struct rte_eth_dev *dev)
 908 {
 909         int i;
 910
 911         for (i = 0; i < dev->data->nb_tx_queues; i++)
 912                 dev->data->tx_queue_state[i] = RTE_ETH_QUEUE_STATE_STOPPED;
 913         for (i = 0; i < dev->data->nb_rx_queues; i++)
 914                 dev->data->rx_queue_state[i] = RTE_ETH_QUEUE_STATE_STOPPED;
 915
 916         tap_intr_handle_set(dev, 0);
 917         tap_link_set_down(dev);
 918
 919         return 0;
 920 }
 921
 922 static int
 923 tap_dev_configure(struct rte_eth_dev *dev)
 924 {
 925         struct pmd_internals *pmd = dev->data->dev_private;
 926
 927         if (dev->data->nb_rx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 928                 TAP_LOG(ERR,
 929                         "%s: number of rx queues %d exceeds max num of queues %d",
 930                         dev->device->name,
 931                         dev->data->nb_rx_queues,
 932                         RTE_PMD_TAP_MAX_QUEUES);
 933                 return -1;
 934         }
 935         if (dev->data->nb_tx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 936                 TAP_LOG(ERR,
 937                         "%s: number of tx queues %d exceeds max num of queues %d",
 938                         dev->device->name,
 939                         dev->data->nb_tx_queues,
 940                         RTE_PMD_TAP_MAX_QUEUES);
 941                 return -1;
 942         }
 943
 944         TAP_LOG(INFO, "%s: %s: TX configured queues number: %u",
 945                 dev->device->name, pmd->name, dev->data->nb_tx_queues);
 946
 947         TAP_LOG(INFO, "%s: %s: RX configured queues number: %u",
 948                 dev->device->name, pmd->name, dev->data->nb_rx_queues);
 949
 950         return 0;
 951 }
 952
 953 static uint32_t
 954 tap_dev_speed_capa(void)
 955 {
 956         uint32_t speed = pmd_link.link_speed;
 957         uint32_t capa = 0;
 958
 959         if (speed >= ETH_SPEED_NUM_10M)
 960                 capa |= ETH_LINK_SPEED_10M;
 961         if (speed >= ETH_SPEED_NUM_100M)
 962                 capa |= ETH_LINK_SPEED_100M;
 963         if (speed >= ETH_SPEED_NUM_1G)
 964                 capa |= ETH_LINK_SPEED_1G;
 965         if (speed >= ETH_SPEED_NUM_5G)
 966                 capa |= ETH_LINK_SPEED_2_5G;
 967         if (speed >= ETH_SPEED_NUM_5G)
 968                 capa |= ETH_LINK_SPEED_5G;
 969         if (speed >= ETH_SPEED_NUM_10G)
 970                 capa |= ETH_LINK_SPEED_10G;
 971         if (speed >= ETH_SPEED_NUM_20G)
 972                 capa |= ETH_LINK_SPEED_20G;
 973         if (speed >= ETH_SPEED_NUM_25G)
 974                 capa |= ETH_LINK_SPEED_25G;
 975         if (speed >= ETH_SPEED_NUM_40G)
 976                 capa |= ETH_LINK_SPEED_40G;
 977         if (speed >= ETH_SPEED_NUM_50G)
 978                 capa |= ETH_LINK_SPEED_50G;
 979         if (speed >= ETH_SPEED_NUM_56G)
 980                 capa |= ETH_LINK_SPEED_56G;
 981         if (speed >= ETH_SPEED_NUM_100G)
 982                 capa |= ETH_LINK_SPEED_100G;
 983
 984         return capa;
 985 }
 986
 987 static int
 988 tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 989 {
 990         struct pmd_internals *internals = dev->data->dev_private;
 991
 992         dev_info->if_index = internals->if_index;
 993         dev_info->max_mac_addrs = 1;
 994         dev_info->max_rx_pktlen = (uint32_t)RTE_ETHER_MAX_VLAN_FRAME_LEN;
 995         dev_info->max_rx_queues = RTE_PMD_TAP_MAX_QUEUES;
 996         dev_info->max_tx_queues = RTE_PMD_TAP_MAX_QUEUES;
 997         dev_info->min_rx_bufsize = 0;
 998         dev_info->speed_capa = tap_dev_speed_capa();
 999         dev_info->rx_queue_offload_capa = TAP_RX_OFFLOAD;
1000         dev_info->rx_offload_capa = dev_info->rx_queue_offload_capa;
1001         dev_info->tx_queue_offload_capa = TAP_TX_OFFLOAD;
1002         dev_info->tx_offload_capa = dev_info->tx_queue_offload_capa;
1003         dev_info->hash_key_size = TAP_RSS_HASH_KEY_SIZE;
1004         /*
1005          * limitation: TAP supports all of IP, UDP and TCP hash
1006          * functions together and not in partial combinations
1007          */
1008         dev_info->flow_type_rss_offloads = ~TAP_RSS_HF_MASK;
1009
1010         return 0;
1011 }
1012
1013 static int
1014 tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats)
1015 {
1016         unsigned int i, imax;
1017         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
1018         unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
1019         unsigned long rx_nombuf = 0, ierrors = 0;
1020         const struct pmd_internals *pmd = dev->data->dev_private;
1021
1022         /* rx queue statistics */
1023         imax = (dev->data->nb_rx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
1024                 dev->data->nb_rx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
1025         for (i = 0; i < imax; i++) {
1026                 tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets;
1027                 tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes;
1028                 rx_total += tap_stats->q_ipackets[i];
1029                 rx_bytes_total += tap_stats->q_ibytes[i];
1030                 rx_nombuf += pmd->rxq[i].stats.rx_nombuf;
1031                 ierrors += pmd->rxq[i].stats.ierrors;
1032         }
1033
1034         /* tx queue statistics */
1035         imax = (dev->data->nb_tx_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ?
1036                 dev->data->nb_tx_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS;
1037
1038         for (i = 0; i < imax; i++) {
1039                 tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets;
1040                 tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes;
1041                 tx_total += tap_stats->q_opackets[i];
1042                 tx_err_total += pmd->txq[i].stats.errs;
1043                 tx_bytes_total += tap_stats->q_obytes[i];
1044         }
1045
1046         tap_stats->ipackets = rx_total;
1047         tap_stats->ibytes = rx_bytes_total;
1048         tap_stats->ierrors = ierrors;
1049         tap_stats->rx_nombuf = rx_nombuf;
1050         tap_stats->opackets = tx_total;
1051         tap_stats->oerrors = tx_err_total;
1052         tap_stats->obytes = tx_bytes_total;
1053         return 0;
1054 }
1055
1056 static int
1057 tap_stats_reset(struct rte_eth_dev *dev)
1058 {
1059         int i;
1060         struct pmd_internals *pmd = dev->data->dev_private;
1061
1062         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1063                 pmd->rxq[i].stats.ipackets = 0;
1064                 pmd->rxq[i].stats.ibytes = 0;
1065                 pmd->rxq[i].stats.ierrors = 0;
1066                 pmd->rxq[i].stats.rx_nombuf = 0;
1067
1068                 pmd->txq[i].stats.opackets = 0;
1069                 pmd->txq[i].stats.errs = 0;
1070                 pmd->txq[i].stats.obytes = 0;
1071         }
1072
1073         return 0;
1074 }
1075
1076 static int
1077 tap_dev_close(struct rte_eth_dev *dev)
1078 {
1079         int i;
1080         struct pmd_internals *internals = dev->data->dev_private;
1081         struct pmd_process_private *process_private = dev->process_private;
1082         struct rx_queue *rxq;
1083
1084         if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
1085                 rte_free(dev->process_private);
1086                 return 0;
1087         }
1088
1089         tap_link_set_down(dev);
1090         if (internals->nlsk_fd != -1) {
1091                 tap_flow_flush(dev, NULL);
1092                 tap_flow_implicit_flush(internals, NULL);
1093                 tap_nl_final(internals->nlsk_fd);
1094                 internals->nlsk_fd = -1;
1095         }
1096
1097         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1098                 if (process_private->rxq_fds[i] != -1) {
1099                         rxq = &internals->rxq[i];
1100                         close(process_private->rxq_fds[i]);
1101                         process_private->rxq_fds[i] = -1;
1102                         tap_rxq_pool_free(rxq->pool);
1103                         rte_free(rxq->iovecs);
1104                         rxq->pool = NULL;
1105                         rxq->iovecs = NULL;
1106                 }
1107                 if (process_private->txq_fds[i] != -1) {
1108                         close(process_private->txq_fds[i]);
1109                         process_private->txq_fds[i] = -1;
1110                 }
1111         }
1112
1113         if (internals->remote_if_index) {
1114                 /* Restore initial remote state */
1115                 int ret = ioctl(internals->ioctl_sock, SIOCSIFFLAGS,
1116                                 &internals->remote_initial_flags);
1117                 if (ret)
1118                         TAP_LOG(ERR, "restore remote state failed: %d", ret);
1119
1120         }
1121
1122         rte_mempool_free(internals->gso_ctx_mp);
1123         internals->gso_ctx_mp = NULL;
1124
1125         if (internals->ka_fd != -1) {
1126                 close(internals->ka_fd);
1127                 internals->ka_fd = -1;
1128         }
1129
1130         /* mac_addrs must not be freed alone because part of dev_private */
1131         dev->data->mac_addrs = NULL;
1132
1133         internals = dev->data->dev_private;
1134         TAP_LOG(DEBUG, "Closing %s Ethernet device on numa %u",
1135                 tuntap_types[internals->type], rte_socket_id());
1136
1137         if (internals->ioctl_sock != -1) {
1138                 close(internals->ioctl_sock);
1139                 internals->ioctl_sock = -1;
1140         }
1141         rte_free(dev->process_private);
1142         if (tap_devices_count == 1)
1143                 rte_mp_action_unregister(TAP_MP_KEY);
1144         tap_devices_count--;
1145         /*
1146          * Since TUN device has no more opened file descriptors
1147          * it will be removed from kernel
1148          */
1149
1150         return 0;
1151 }
1152
1153 static void
1154 tap_rx_queue_release(struct rte_eth_dev *dev, uint16_t qid)
1155 {
1156         struct rx_queue *rxq = dev->data->rx_queues[qid];
1157         struct pmd_process_private *process_private;
1158
1159         if (!rxq)
1160                 return;
1161         process_private = rte_eth_devices[rxq->in_port].process_private;
1162         if (process_private->rxq_fds[rxq->queue_id] != -1) {
1163                 close(process_private->rxq_fds[rxq->queue_id]);
1164                 process_private->rxq_fds[rxq->queue_id] = -1;
1165                 tap_rxq_pool_free(rxq->pool);
1166                 rte_free(rxq->iovecs);
1167                 rxq->pool = NULL;
1168                 rxq->iovecs = NULL;
1169         }
1170 }
1171
1172 static void
1173 tap_tx_queue_release(struct rte_eth_dev *dev, uint16_t qid)
1174 {
1175         struct tx_queue *txq = dev->data->tx_queues[qid];
1176         struct pmd_process_private *process_private;
1177
1178         if (!txq)
1179                 return;
1180         process_private = rte_eth_devices[txq->out_port].process_private;
1181
1182         if (process_private->txq_fds[txq->queue_id] != -1) {
1183                 close(process_private->txq_fds[txq->queue_id]);
1184                 process_private->txq_fds[txq->queue_id] = -1;
1185         }
1186 }
1187
1188 static int
1189 tap_link_update(struct rte_eth_dev *dev, int wait_to_complete __rte_unused)
1190 {
1191         struct rte_eth_link *dev_link = &dev->data->dev_link;
1192         struct pmd_internals *pmd = dev->data->dev_private;
1193         struct ifreq ifr = { .ifr_flags = 0 };
1194
1195         if (pmd->remote_if_index) {
1196                 tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, REMOTE_ONLY);
1197                 if (!(ifr.ifr_flags & IFF_UP) ||
1198                     !(ifr.ifr_flags & IFF_RUNNING)) {
1199                         dev_link->link_status = ETH_LINK_DOWN;
1200                         return 0;
1201                 }
1202         }
1203         tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, LOCAL_ONLY);
1204         dev_link->link_status =
1205                 ((ifr.ifr_flags & IFF_UP) && (ifr.ifr_flags & IFF_RUNNING) ?
1206                  ETH_LINK_UP :
1207                  ETH_LINK_DOWN);
1208         return 0;
1209 }
1210
1211 static int
1212 tap_promisc_enable(struct rte_eth_dev *dev)
1213 {
1214         struct pmd_internals *pmd = dev->data->dev_private;
1215         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
1216         int ret;
1217
1218         ret = tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
1219         if (ret != 0)
1220                 return ret;
1221
1222         if (pmd->remote_if_index && !pmd->flow_isolate) {
1223                 dev->data->promiscuous = 1;
1224                 ret = tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC);
1225                 if (ret != 0) {
1226                         /* Rollback promisc flag */
1227                         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
1228                         /*
1229                          * rte_eth_dev_promiscuous_enable() rollback
1230                          * dev->data->promiscuous in the case of failure.
1231                          */
1232                         return ret;
1233                 }
1234         }
1235
1236         return 0;
1237 }
1238
1239 static int
1240 tap_promisc_disable(struct rte_eth_dev *dev)
1241 {
1242         struct pmd_internals *pmd = dev->data->dev_private;
1243         struct ifreq ifr = { .ifr_flags = IFF_PROMISC };
1244         int ret;
1245
1246         ret = tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
1247         if (ret != 0)
1248                 return ret;
1249
1250         if (pmd->remote_if_index && !pmd->flow_isolate) {
1251                 dev->data->promiscuous = 0;
1252                 ret = tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC);
1253                 if (ret != 0) {
1254                         /* Rollback promisc flag */
1255                         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
1256                         /*
1257                          * rte_eth_dev_promiscuous_disable() rollback
1258                          * dev->data->promiscuous in the case of failure.
1259                          */
1260                         return ret;
1261                 }
1262         }
1263
1264         return 0;
1265 }
1266
1267 static int
1268 tap_allmulti_enable(struct rte_eth_dev *dev)
1269 {
1270         struct pmd_internals *pmd = dev->data->dev_private;
1271         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
1272         int ret;
1273
1274         ret = tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
1275         if (ret != 0)
1276                 return ret;
1277
1278         if (pmd->remote_if_index && !pmd->flow_isolate) {
1279                 dev->data->all_multicast = 1;
1280                 ret = tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI);
1281                 if (ret != 0) {
1282                         /* Rollback allmulti flag */
1283                         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
1284                         /*
1285                          * rte_eth_dev_allmulticast_enable() rollback
1286                          * dev->data->all_multicast in the case of failure.
1287                          */
1288                         return ret;
1289                 }
1290         }
1291
1292         return 0;
1293 }
1294
1295 static int
1296 tap_allmulti_disable(struct rte_eth_dev *dev)
1297 {
1298         struct pmd_internals *pmd = dev->data->dev_private;
1299         struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI };
1300         int ret;
1301
1302         ret = tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE);
1303         if (ret != 0)
1304                 return ret;
1305
1306         if (pmd->remote_if_index && !pmd->flow_isolate) {
1307                 dev->data->all_multicast = 0;
1308                 ret = tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI);
1309                 if (ret != 0) {
1310                         /* Rollback allmulti flag */
1311                         tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE);
1312                         /*
1313                          * rte_eth_dev_allmulticast_disable() rollback
1314                          * dev->data->all_multicast in the case of failure.
1315                          */
1316                         return ret;
1317                 }
1318         }
1319
1320         return 0;
1321 }
1322
1323 static int
1324 tap_mac_set(struct rte_eth_dev *dev, struct rte_ether_addr *mac_addr)
1325 {
1326         struct pmd_internals *pmd = dev->data->dev_private;
1327         enum ioctl_mode mode = LOCAL_ONLY;
1328         struct ifreq ifr;
1329         int ret;
1330
1331         if (pmd->type == ETH_TUNTAP_TYPE_TUN) {
1332                 TAP_LOG(ERR, "%s: can't MAC address for TUN",
1333                         dev->device->name);
1334                 return -ENOTSUP;
1335         }
1336
1337         if (rte_is_zero_ether_addr(mac_addr)) {
1338                 TAP_LOG(ERR, "%s: can't set an empty MAC address",
1339                         dev->device->name);
1340                 return -EINVAL;
1341         }
1342         /* Check the actual current MAC address on the tap netdevice */
1343         ret = tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, LOCAL_ONLY);
1344         if (ret < 0)
1345                 return ret;
1346         if (rte_is_same_ether_addr(
1347                         (struct rte_ether_addr *)&ifr.ifr_hwaddr.sa_data,
1348                         mac_addr))
1349                 return 0;
1350         /* Check the current MAC address on the remote */
1351         ret = tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY);
1352         if (ret < 0)
1353                 return ret;
1354         if (!rte_is_same_ether_addr(
1355                         (struct rte_ether_addr *)&ifr.ifr_hwaddr.sa_data,
1356                         mac_addr))
1357                 mode = LOCAL_AND_REMOTE;
1358         ifr.ifr_hwaddr.sa_family = AF_LOCAL;
1359         rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, RTE_ETHER_ADDR_LEN);
1360         ret = tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1, mode);
1361         if (ret < 0)
1362                 return ret;
1363         rte_memcpy(&pmd->eth_addr, mac_addr, RTE_ETHER_ADDR_LEN);
1364         if (pmd->remote_if_index && !pmd->flow_isolate) {
1365                 /* Replace MAC redirection rule after a MAC change */
1366                 ret = tap_flow_implicit_destroy(pmd, TAP_REMOTE_LOCAL_MAC);
1367                 if (ret < 0) {
1368                         TAP_LOG(ERR,
1369                                 "%s: Couldn't delete MAC redirection rule",
1370                                 dev->device->name);
1371                         return ret;
1372                 }
1373                 ret = tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC);
1374                 if (ret < 0) {
1375                         TAP_LOG(ERR,
1376                                 "%s: Couldn't add MAC redirection rule",
1377                                 dev->device->name);
1378                         return ret;
1379                 }
1380         }
1381
1382         return 0;
1383 }
1384
1385 static int
1386 tap_gso_ctx_setup(struct rte_gso_ctx *gso_ctx, struct rte_eth_dev *dev)
1387 {
1388         uint32_t gso_types;
1389         char pool_name[64];
1390         struct pmd_internals *pmd = dev->data->dev_private;
1391         int ret;
1392
1393         /* initialize GSO context */
1394         gso_types = DEV_TX_OFFLOAD_TCP_TSO;
1395         if (!pmd->gso_ctx_mp) {
1396                 /*
1397                  * Create private mbuf pool with TAP_GSO_MBUF_SEG_SIZE
1398                  * bytes size per mbuf use this pool for both direct and
1399                  * indirect mbufs
1400                  */
1401                 ret = snprintf(pool_name, sizeof(pool_name), "mp_%s",
1402                                 dev->device->name);
1403                 if (ret < 0 || ret >= (int)sizeof(pool_name)) {
1404                         TAP_LOG(ERR,
1405                                 "%s: failed to create mbuf pool name for device %s,"
1406                                 "device name too long or output error, ret: %d\n",
1407                                 pmd->name, dev->device->name, ret);
1408                         return -ENAMETOOLONG;
1409                 }
1410                 pmd->gso_ctx_mp = rte_pktmbuf_pool_create(pool_name,
1411                         TAP_GSO_MBUFS_NUM, TAP_GSO_MBUF_CACHE_SIZE, 0,
1412                         RTE_PKTMBUF_HEADROOM + TAP_GSO_MBUF_SEG_SIZE,
1413                         SOCKET_ID_ANY);
1414                 if (!pmd->gso_ctx_mp) {
1415                         TAP_LOG(ERR,
1416                                 "%s: failed to create mbuf pool for device %s\n",
1417                                 pmd->name, dev->device->name);
1418                         return -1;
1419                 }
1420         }
1421
1422         gso_ctx->direct_pool = pmd->gso_ctx_mp;
1423         gso_ctx->indirect_pool = pmd->gso_ctx_mp;
1424         gso_ctx->gso_types = gso_types;
1425         gso_ctx->gso_size = 0; /* gso_size is set in tx_burst() per packet */
1426         gso_ctx->flag = 0;
1427
1428         return 0;
1429 }
1430
1431 static int
1432 tap_setup_queue(struct rte_eth_dev *dev,
1433                 struct pmd_internals *internals,
1434                 uint16_t qid,
1435                 int is_rx)
1436 {
1437         int ret;
1438         int *fd;
1439         int *other_fd;
1440         const char *dir;
1441         struct pmd_internals *pmd = dev->data->dev_private;
1442         struct pmd_process_private *process_private = dev->process_private;
1443         struct rx_queue *rx = &internals->rxq[qid];
1444         struct tx_queue *tx = &internals->txq[qid];
1445         struct rte_gso_ctx *gso_ctx;
1446
1447         if (is_rx) {
1448                 fd = &process_private->rxq_fds[qid];
1449                 other_fd = &process_private->txq_fds[qid];
1450                 dir = "rx";
1451                 gso_ctx = NULL;
1452         } else {
1453                 fd = &process_private->txq_fds[qid];
1454                 other_fd = &process_private->rxq_fds[qid];
1455                 dir = "tx";
1456                 gso_ctx = &tx->gso_ctx;
1457         }
1458         if (*fd != -1) {
1459                 /* fd for this queue already exists */
1460                 TAP_LOG(DEBUG, "%s: fd %d for %s queue qid %d exists",
1461                         pmd->name, *fd, dir, qid);
1462                 gso_ctx = NULL;
1463         } else if (*other_fd != -1) {
1464                 /* Only other_fd exists. dup it */
1465                 *fd = dup(*other_fd);
1466                 if (*fd < 0) {
1467                         *fd = -1;
1468                         TAP_LOG(ERR, "%s: dup() failed.", pmd->name);
1469                         return -1;
1470                 }
1471                 TAP_LOG(DEBUG, "%s: dup fd %d for %s queue qid %d (%d)",
1472                         pmd->name, *other_fd, dir, qid, *fd);
1473         } else {
1474                 /* Both RX and TX fds do not exist (equal -1). Create fd */
1475                 *fd = tun_alloc(pmd, 0);
1476                 if (*fd < 0) {
1477                         *fd = -1; /* restore original value */
1478                         TAP_LOG(ERR, "%s: tun_alloc() failed.", pmd->name);
1479                         return -1;
1480                 }
1481                 TAP_LOG(DEBUG, "%s: add %s queue for qid %d fd %d",
1482                         pmd->name, dir, qid, *fd);
1483         }
1484
1485         tx->mtu = &dev->data->mtu;
1486         rx->rxmode = &dev->data->dev_conf.rxmode;
1487         if (gso_ctx) {
1488                 ret = tap_gso_ctx_setup(gso_ctx, dev);
1489                 if (ret)
1490                         return -1;
1491         }
1492
1493         tx->type = pmd->type;
1494
1495         return *fd;
1496 }
1497
1498 static int
1499 tap_rx_queue_setup(struct rte_eth_dev *dev,
1500                    uint16_t rx_queue_id,
1501                    uint16_t nb_rx_desc,
1502                    unsigned int socket_id,
1503                    const struct rte_eth_rxconf *rx_conf __rte_unused,
1504                    struct rte_mempool *mp)
1505 {
1506         struct pmd_internals *internals = dev->data->dev_private;
1507         struct pmd_process_private *process_private = dev->process_private;
1508         struct rx_queue *rxq = &internals->rxq[rx_queue_id];
1509         struct rte_mbuf **tmp = &rxq->pool;
1510         long iov_max = sysconf(_SC_IOV_MAX);
1511
1512         if (iov_max <= 0) {
1513                 TAP_LOG(WARNING,
1514                         "_SC_IOV_MAX is not defined. Using %d as default",
1515                         TAP_IOV_DEFAULT_MAX);
1516                 iov_max = TAP_IOV_DEFAULT_MAX;
1517         }
1518         uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1);
1519         struct iovec (*iovecs)[nb_desc + 1];
1520         int data_off = RTE_PKTMBUF_HEADROOM;
1521         int ret = 0;
1522         int fd;
1523         int i;
1524
1525         if (rx_queue_id >= dev->data->nb_rx_queues || !mp) {
1526                 TAP_LOG(WARNING,
1527                         "nb_rx_queues %d too small or mempool NULL",
1528                         dev->data->nb_rx_queues);
1529                 return -1;
1530         }
1531
1532         rxq->mp = mp;
1533         rxq->trigger_seen = 1; /* force initial burst */
1534         rxq->in_port = dev->data->port_id;
1535         rxq->queue_id = rx_queue_id;
1536         rxq->nb_rx_desc = nb_desc;
1537         iovecs = rte_zmalloc_socket(dev->device->name, sizeof(*iovecs), 0,
1538                                     socket_id);
1539         if (!iovecs) {
1540                 TAP_LOG(WARNING,
1541                         "%s: Couldn't allocate %d RX descriptors",
1542                         dev->device->name, nb_desc);
1543                 return -ENOMEM;
1544         }
1545         rxq->iovecs = iovecs;
1546
1547         dev->data->rx_queues[rx_queue_id] = rxq;
1548         fd = tap_setup_queue(dev, internals, rx_queue_id, 1);
1549         if (fd == -1) {
1550                 ret = fd;
1551                 goto error;
1552         }
1553
1554         (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi);
1555         (*rxq->iovecs)[0].iov_base = &rxq->pi;
1556
1557         for (i = 1; i <= nb_desc; i++) {
1558                 *tmp = rte_pktmbuf_alloc(rxq->mp);
1559                 if (!*tmp) {
1560                         TAP_LOG(WARNING,
1561                                 "%s: couldn't allocate memory for queue %d",
1562                                 dev->device->name, rx_queue_id);
1563                         ret = -ENOMEM;
1564                         goto error;
1565                 }
1566                 (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off;
1567                 (*rxq->iovecs)[i].iov_base =
1568                         (char *)(*tmp)->buf_addr + data_off;
1569                 data_off = 0;
1570                 tmp = &(*tmp)->next;
1571         }
1572
1573         TAP_LOG(DEBUG, "  RX TUNTAP device name %s, qid %d on fd %d",
1574                 internals->name, rx_queue_id,
1575                 process_private->rxq_fds[rx_queue_id]);
1576
1577         return 0;
1578
1579 error:
1580         tap_rxq_pool_free(rxq->pool);
1581         rxq->pool = NULL;
1582         rte_free(rxq->iovecs);
1583         rxq->iovecs = NULL;
1584         return ret;
1585 }
1586
1587 static int
1588 tap_tx_queue_setup(struct rte_eth_dev *dev,
1589                    uint16_t tx_queue_id,
1590                    uint16_t nb_tx_desc __rte_unused,
1591                    unsigned int socket_id __rte_unused,
1592                    const struct rte_eth_txconf *tx_conf)
1593 {
1594         struct pmd_internals *internals = dev->data->dev_private;
1595         struct pmd_process_private *process_private = dev->process_private;
1596         struct tx_queue *txq;
1597         int ret;
1598         uint64_t offloads;
1599
1600         if (tx_queue_id >= dev->data->nb_tx_queues)
1601                 return -1;
1602         dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
1603         txq = dev->data->tx_queues[tx_queue_id];
1604         txq->out_port = dev->data->port_id;
1605         txq->queue_id = tx_queue_id;
1606
1607         offloads = tx_conf->offloads | dev->data->dev_conf.txmode.offloads;
1608         txq->csum = !!(offloads &
1609                         (DEV_TX_OFFLOAD_IPV4_CKSUM |
1610                          DEV_TX_OFFLOAD_UDP_CKSUM |
1611                          DEV_TX_OFFLOAD_TCP_CKSUM));
1612
1613         ret = tap_setup_queue(dev, internals, tx_queue_id, 0);
1614         if (ret == -1)
1615                 return -1;
1616         TAP_LOG(DEBUG,
1617                 "  TX TUNTAP device name %s, qid %d on fd %d csum %s",
1618                 internals->name, tx_queue_id,
1619                 process_private->txq_fds[tx_queue_id],
1620                 txq->csum ? "on" : "off");
1621
1622         return 0;
1623 }
1624
1625 static int
1626 tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
1627 {
1628         struct pmd_internals *pmd = dev->data->dev_private;
1629         struct ifreq ifr = { .ifr_mtu = mtu };
1630
1631         return tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE);
1632 }
1633
1634 static int
1635 tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused,
1636                      struct rte_ether_addr *mc_addr_set __rte_unused,
1637                      uint32_t nb_mc_addr __rte_unused)
1638 {
1639         /*
1640          * Nothing to do actually: the tap has no filtering whatsoever, every
1641          * packet is received.
1642          */
1643         return 0;
1644 }
1645
1646 static int
1647 tap_nl_msg_handler(struct nlmsghdr *nh, void *arg)
1648 {
1649         struct rte_eth_dev *dev = arg;
1650         struct pmd_internals *pmd = dev->data->dev_private;
1651         struct ifinfomsg *info = NLMSG_DATA(nh);
1652
1653         if (nh->nlmsg_type != RTM_NEWLINK ||
1654             (info->ifi_index != pmd->if_index &&
1655              info->ifi_index != pmd->remote_if_index))
1656                 return 0;
1657         return tap_link_update(dev, 0);
1658 }
1659
1660 static void
1661 tap_dev_intr_handler(void *cb_arg)
1662 {
1663         struct rte_eth_dev *dev = cb_arg;
1664         struct pmd_internals *pmd = dev->data->dev_private;
1665
1666         tap_nl_recv(pmd->intr_handle.fd, tap_nl_msg_handler, dev);
1667 }
1668
1669 static int
1670 tap_lsc_intr_handle_set(struct rte_eth_dev *dev, int set)
1671 {
1672         struct pmd_internals *pmd = dev->data->dev_private;
1673         int ret;
1674
1675         /* In any case, disable interrupt if the conf is no longer there. */
1676         if (!dev->data->dev_conf.intr_conf.lsc) {
1677                 if (pmd->intr_handle.fd != -1) {
1678                         goto clean;
1679                 }
1680                 return 0;
1681         }
1682         if (set) {
1683                 pmd->intr_handle.fd = tap_nl_init(RTMGRP_LINK);
1684                 if (unlikely(pmd->intr_handle.fd == -1))
1685                         return -EBADF;
1686                 return rte_intr_callback_register(
1687                         &pmd->intr_handle, tap_dev_intr_handler, dev);
1688         }
1689
1690 clean:
1691         do {
1692                 ret = rte_intr_callback_unregister(&pmd->intr_handle,
1693                         tap_dev_intr_handler, dev);
1694                 if (ret >= 0) {
1695                         break;
1696                 } else if (ret == -EAGAIN) {
1697                         rte_delay_ms(100);
1698                 } else {
1699                         TAP_LOG(ERR, "intr callback unregister failed: %d",
1700                                      ret);
1701                         break;
1702                 }
1703         } while (true);
1704
1705         tap_nl_final(pmd->intr_handle.fd);
1706         pmd->intr_handle.fd = -1;
1707
1708         return 0;
1709 }
1710
1711 static int
1712 tap_intr_handle_set(struct rte_eth_dev *dev, int set)
1713 {
1714         int err;
1715
1716         err = tap_lsc_intr_handle_set(dev, set);
1717         if (err < 0) {
1718                 if (!set)
1719                         tap_rx_intr_vec_set(dev, 0);
1720                 return err;
1721         }
1722         err = tap_rx_intr_vec_set(dev, set);
1723         if (err && set)
1724                 tap_lsc_intr_handle_set(dev, 0);
1725         return err;
1726 }
1727
1728 static const uint32_t*
1729 tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused)
1730 {
1731         static const uint32_t ptypes[] = {
1732                 RTE_PTYPE_INNER_L2_ETHER,
1733                 RTE_PTYPE_INNER_L2_ETHER_VLAN,
1734                 RTE_PTYPE_INNER_L2_ETHER_QINQ,
1735                 RTE_PTYPE_INNER_L3_IPV4,
1736                 RTE_PTYPE_INNER_L3_IPV4_EXT,
1737                 RTE_PTYPE_INNER_L3_IPV6,
1738                 RTE_PTYPE_INNER_L3_IPV6_EXT,
1739                 RTE_PTYPE_INNER_L4_FRAG,
1740                 RTE_PTYPE_INNER_L4_UDP,
1741                 RTE_PTYPE_INNER_L4_TCP,
1742                 RTE_PTYPE_INNER_L4_SCTP,
1743                 RTE_PTYPE_L2_ETHER,
1744                 RTE_PTYPE_L2_ETHER_VLAN,
1745                 RTE_PTYPE_L2_ETHER_QINQ,
1746                 RTE_PTYPE_L3_IPV4,
1747                 RTE_PTYPE_L3_IPV4_EXT,
1748                 RTE_PTYPE_L3_IPV6_EXT,
1749                 RTE_PTYPE_L3_IPV6,
1750                 RTE_PTYPE_L4_FRAG,
1751                 RTE_PTYPE_L4_UDP,
1752                 RTE_PTYPE_L4_TCP,
1753                 RTE_PTYPE_L4_SCTP,
1754         };
1755
1756         return ptypes;
1757 }
1758
1759 static int
1760 tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused,
1761                   struct rte_eth_fc_conf *fc_conf)
1762 {
1763         fc_conf->mode = RTE_FC_NONE;
1764         return 0;
1765 }
1766
1767 static int
1768 tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused,
1769                   struct rte_eth_fc_conf *fc_conf)
1770 {
1771         if (fc_conf->mode != RTE_FC_NONE)
1772                 return -ENOTSUP;
1773         return 0;
1774 }
1775
1776 /**
1777  * DPDK callback to update the RSS hash configuration.
1778  *
1779  * @param dev
1780  *   Pointer to Ethernet device structure.
1781  * @param[in] rss_conf
1782  *   RSS configuration data.
1783  *
1784  * @return
1785  *   0 on success, a negative errno value otherwise and rte_errno is set.
1786  */
1787 static int
1788 tap_rss_hash_update(struct rte_eth_dev *dev,
1789                 struct rte_eth_rss_conf *rss_conf)
1790 {
1791         if (rss_conf->rss_hf & TAP_RSS_HF_MASK) {
1792                 rte_errno = EINVAL;
1793                 return -rte_errno;
1794         }
1795         if (rss_conf->rss_key && rss_conf->rss_key_len) {
1796                 /*
1797                  * Currently TAP RSS key is hard coded
1798                  * and cannot be updated
1799                  */
1800                 TAP_LOG(ERR,
1801                         "port %u RSS key cannot be updated",
1802                         dev->data->port_id);
1803                 rte_errno = EINVAL;
1804                 return -rte_errno;
1805         }
1806         return 0;
1807 }
1808
1809 static int
1810 tap_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id)
1811 {
1812         dev->data->rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STARTED;
1813
1814         return 0;
1815 }
1816
1817 static int
1818 tap_tx_queue_start(struct rte_eth_dev *dev, uint16_t tx_queue_id)
1819 {
1820         dev->data->tx_queue_state[tx_queue_id] = RTE_ETH_QUEUE_STATE_STARTED;
1821
1822         return 0;
1823 }
1824
1825 static int
1826 tap_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
1827 {
1828         dev->data->rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;
1829
1830         return 0;
1831 }
1832
1833 static int
1834 tap_tx_queue_stop(struct rte_eth_dev *dev, uint16_t tx_queue_id)
1835 {
1836         dev->data->tx_queue_state[tx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;
1837
1838         return 0;
1839 }
1840 static const struct eth_dev_ops ops = {
1841         .dev_start              = tap_dev_start,
1842         .dev_stop               = tap_dev_stop,
1843         .dev_close              = tap_dev_close,
1844         .dev_configure          = tap_dev_configure,
1845         .dev_infos_get          = tap_dev_info,
1846         .rx_queue_setup         = tap_rx_queue_setup,
1847         .tx_queue_setup         = tap_tx_queue_setup,
1848         .rx_queue_start         = tap_rx_queue_start,
1849         .tx_queue_start         = tap_tx_queue_start,
1850         .rx_queue_stop          = tap_rx_queue_stop,
1851         .tx_queue_stop          = tap_tx_queue_stop,
1852         .rx_queue_release       = tap_rx_queue_release,
1853         .tx_queue_release       = tap_tx_queue_release,
1854         .flow_ctrl_get          = tap_flow_ctrl_get,
1855         .flow_ctrl_set          = tap_flow_ctrl_set,
1856         .link_update            = tap_link_update,
1857         .dev_set_link_up        = tap_link_set_up,
1858         .dev_set_link_down      = tap_link_set_down,
1859         .promiscuous_enable     = tap_promisc_enable,
1860         .promiscuous_disable    = tap_promisc_disable,
1861         .allmulticast_enable    = tap_allmulti_enable,
1862         .allmulticast_disable   = tap_allmulti_disable,
1863         .mac_addr_set           = tap_mac_set,
1864         .mtu_set                = tap_mtu_set,
1865         .set_mc_addr_list       = tap_set_mc_addr_list,
1866         .stats_get              = tap_stats_get,
1867         .stats_reset            = tap_stats_reset,
1868         .dev_supported_ptypes_get = tap_dev_supported_ptypes_get,
1869         .rss_hash_update        = tap_rss_hash_update,
1870         .flow_ops_get           = tap_dev_flow_ops_get,
1871 };
1872
1873 static int
1874 eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name,
1875                    char *remote_iface, struct rte_ether_addr *mac_addr,
1876                    enum rte_tuntap_type type)
1877 {
1878         int numa_node = rte_socket_id();
1879         struct rte_eth_dev *dev;
1880         struct pmd_internals *pmd;
1881         struct pmd_process_private *process_private;
1882         const char *tuntap_name = tuntap_types[type];
1883         struct rte_eth_dev_data *data;
1884         struct ifreq ifr;
1885         int i;
1886
1887         TAP_LOG(DEBUG, "%s device on numa %u", tuntap_name, rte_socket_id());
1888
1889         dev = rte_eth_vdev_allocate(vdev, sizeof(*pmd));
1890         if (!dev) {
1891                 TAP_LOG(ERR, "%s Unable to allocate device struct",
1892                                 tuntap_name);
1893                 goto error_exit_nodev;
1894         }
1895
1896         process_private = (struct pmd_process_private *)
1897                 rte_zmalloc_socket(tap_name, sizeof(struct pmd_process_private),
1898                         RTE_CACHE_LINE_SIZE, dev->device->numa_node);
1899
1900         if (process_private == NULL) {
1901                 TAP_LOG(ERR, "Failed to alloc memory for process private");
1902                 return -1;
1903         }
1904         pmd = dev->data->dev_private;
1905         dev->process_private = process_private;
1906         pmd->dev = dev;
1907         strlcpy(pmd->name, tap_name, sizeof(pmd->name));
1908         pmd->type = type;
1909         pmd->ka_fd = -1;
1910         pmd->nlsk_fd = -1;
1911         pmd->gso_ctx_mp = NULL;
1912
1913         pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
1914         if (pmd->ioctl_sock == -1) {
1915                 TAP_LOG(ERR,
1916                         "%s Unable to get a socket for management: %s",
1917                         tuntap_name, strerror(errno));
1918                 goto error_exit;
1919         }
1920
1921         /* Setup some default values */
1922         data = dev->data;
1923         data->dev_private = pmd;
1924         data->dev_flags = RTE_ETH_DEV_INTR_LSC |
1925                                 RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS;
1926         data->numa_node = numa_node;
1927
1928         data->dev_link = pmd_link;
1929         data->mac_addrs = &pmd->eth_addr;
1930         /* Set the number of RX and TX queues */
1931         data->nb_rx_queues = 0;
1932         data->nb_tx_queues = 0;
1933
1934         dev->dev_ops = &ops;
1935         dev->rx_pkt_burst = pmd_rx_burst;
1936         dev->tx_pkt_burst = pmd_tx_burst;
1937
1938         pmd->intr_handle.type = RTE_INTR_HANDLE_EXT;
1939         pmd->intr_handle.fd = -1;
1940         dev->intr_handle = &pmd->intr_handle;
1941
1942         /* Presetup the fds to -1 as being not valid */
1943         for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
1944                 process_private->rxq_fds[i] = -1;
1945                 process_private->txq_fds[i] = -1;
1946         }
1947
1948         if (pmd->type == ETH_TUNTAP_TYPE_TAP) {
1949                 if (rte_is_zero_ether_addr(mac_addr))
1950                         rte_eth_random_addr((uint8_t *)&pmd->eth_addr);
1951                 else
1952                         rte_memcpy(&pmd->eth_addr, mac_addr, sizeof(*mac_addr));
1953         }
1954
1955         /*
1956          * Allocate a TUN device keep-alive file descriptor that will only be
1957          * closed when the TUN device itself is closed or removed.
1958          * This keep-alive file descriptor will guarantee that the TUN device
1959          * exists even when all of its queues are closed
1960          */
1961         pmd->ka_fd = tun_alloc(pmd, 1);
1962         if (pmd->ka_fd == -1) {
1963                 TAP_LOG(ERR, "Unable to create %s interface", tuntap_name);
1964                 goto error_exit;
1965         }
1966         TAP_LOG(DEBUG, "allocated %s", pmd->name);
1967
1968         ifr.ifr_mtu = dev->data->mtu;
1969         if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE) < 0)
1970                 goto error_exit;
1971
1972         if (pmd->type == ETH_TUNTAP_TYPE_TAP) {
1973                 memset(&ifr, 0, sizeof(struct ifreq));
1974                 ifr.ifr_hwaddr.sa_family = AF_LOCAL;
1975                 rte_memcpy(ifr.ifr_hwaddr.sa_data, &pmd->eth_addr,
1976                                 RTE_ETHER_ADDR_LEN);
1977                 if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0)
1978                         goto error_exit;
1979         }
1980
1981         /*
1982          * Set up everything related to rte_flow:
1983          * - netlink socket
1984          * - tap / remote if_index
1985          * - mandatory QDISCs
1986          * - rte_flow actual/implicit lists
1987          * - implicit rules
1988          */
1989         pmd->nlsk_fd = tap_nl_init(0);
1990         if (pmd->nlsk_fd == -1) {
1991                 TAP_LOG(WARNING, "%s: failed to create netlink socket.",
1992                         pmd->name);
1993                 goto disable_rte_flow;
1994         }
1995         pmd->if_index = if_nametoindex(pmd->name);
1996         if (!pmd->if_index) {
1997                 TAP_LOG(ERR, "%s: failed to get if_index.", pmd->name);
1998                 goto disable_rte_flow;
1999         }
2000         if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) {
2001                 TAP_LOG(ERR, "%s: failed to create multiq qdisc.",
2002                         pmd->name);
2003                 goto disable_rte_flow;
2004         }
2005         if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) {
2006                 TAP_LOG(ERR, "%s: failed to create ingress qdisc.",
2007                         pmd->name);
2008                 goto disable_rte_flow;
2009         }
2010         LIST_INIT(&pmd->flows);
2011
2012         if (strlen(remote_iface)) {
2013                 pmd->remote_if_index = if_nametoindex(remote_iface);
2014                 if (!pmd->remote_if_index) {
2015                         TAP_LOG(ERR, "%s: failed to get %s if_index.",
2016                                 pmd->name, remote_iface);
2017                         goto error_remote;
2018                 }
2019                 strlcpy(pmd->remote_iface, remote_iface, RTE_ETH_NAME_MAX_LEN);
2020
2021                 /* Save state of remote device */
2022                 tap_ioctl(pmd, SIOCGIFFLAGS, &pmd->remote_initial_flags, 0, REMOTE_ONLY);
2023
2024                 /* Replicate remote MAC address */
2025                 if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0) {
2026                         TAP_LOG(ERR, "%s: failed to get %s MAC address.",
2027                                 pmd->name, pmd->remote_iface);
2028                         goto error_remote;
2029                 }
2030                 rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data,
2031                            RTE_ETHER_ADDR_LEN);
2032                 /* The desired MAC is already in ifreq after SIOCGIFHWADDR. */
2033                 if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0) {
2034                         TAP_LOG(ERR, "%s: failed to get %s MAC address.",
2035                                 pmd->name, remote_iface);
2036                         goto error_remote;
2037                 }
2038
2039                 /*
2040                  * Flush usually returns negative value because it tries to
2041                  * delete every QDISC (and on a running device, one QDISC at
2042                  * least is needed). Ignore negative return value.
2043                  */
2044                 qdisc_flush(pmd->nlsk_fd, pmd->remote_if_index);
2045                 if (qdisc_create_ingress(pmd->nlsk_fd,
2046                                          pmd->remote_if_index) < 0) {
2047                         TAP_LOG(ERR, "%s: failed to create ingress qdisc.",
2048                                 pmd->remote_iface);
2049                         goto error_remote;
2050                 }
2051                 LIST_INIT(&pmd->implicit_flows);
2052                 if (tap_flow_implicit_create(pmd, TAP_REMOTE_TX) < 0 ||
2053                     tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0 ||
2054                     tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCAST) < 0 ||
2055                     tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCASTV6) < 0) {
2056                         TAP_LOG(ERR,
2057                                 "%s: failed to create implicit rules.",
2058                                 pmd->name);
2059                         goto error_remote;
2060                 }
2061         }
2062
2063         rte_eth_dev_probing_finish(dev);
2064         return 0;
2065
2066 disable_rte_flow:
2067         TAP_LOG(ERR, " Disabling rte flow support: %s(%d)",
2068                 strerror(errno), errno);
2069         if (strlen(remote_iface)) {
2070                 TAP_LOG(ERR, "Remote feature requires flow support.");
2071                 goto error_exit;
2072         }
2073         rte_eth_dev_probing_finish(dev);
2074         return 0;
2075
2076 error_remote:
2077         TAP_LOG(ERR, " Can't set up remote feature: %s(%d)",
2078                 strerror(errno), errno);
2079         tap_flow_implicit_flush(pmd, NULL);
2080
2081 error_exit:
2082         if (pmd->nlsk_fd != -1)
2083                 close(pmd->nlsk_fd);
2084         if (pmd->ka_fd != -1)
2085                 close(pmd->ka_fd);
2086         if (pmd->ioctl_sock != -1)
2087                 close(pmd->ioctl_sock);
2088         /* mac_addrs must not be freed alone because part of dev_private */
2089         dev->data->mac_addrs = NULL;
2090         rte_eth_dev_release_port(dev);
2091
2092 error_exit_nodev:
2093         TAP_LOG(ERR, "%s Unable to initialize %s",
2094                 tuntap_name, rte_vdev_device_name(vdev));
2095
2096         return -EINVAL;
2097 }
2098
2099 /* make sure name is a possible Linux network device name */
2100 static bool
2101 is_valid_iface(const char *name)
2102 {
2103         if (*name == '\0')
2104                 return false;
2105
2106         if (strnlen(name, IFNAMSIZ) == IFNAMSIZ)
2107                 return false;
2108
2109         while (*name) {
2110                 if (*name == '/' || *name == ':' || isspace(*name))
2111                         return false;
2112                 name++;
2113         }
2114         return true;
2115 }
2116
2117 static int
2118 set_interface_name(const char *key __rte_unused,
2119                    const char *value,
2120                    void *extra_args)
2121 {
2122         char *name = (char *)extra_args;
2123
2124         if (value) {
2125                 if (!is_valid_iface(value)) {
2126                         TAP_LOG(ERR, "TAP invalid remote interface name (%s)",
2127                                 value);
2128                         return -1;
2129                 }
2130                 strlcpy(name, value, RTE_ETH_NAME_MAX_LEN);
2131         } else {
2132                 /* use tap%d which causes kernel to choose next available */
2133                 strlcpy(name, DEFAULT_TAP_NAME "%d", RTE_ETH_NAME_MAX_LEN);
2134         }
2135         return 0;
2136 }
2137
2138 static int
2139 set_remote_iface(const char *key __rte_unused,
2140                  const char *value,
2141                  void *extra_args)
2142 {
2143         char *name = (char *)extra_args;
2144
2145         if (value) {
2146                 if (!is_valid_iface(value)) {
2147                         TAP_LOG(ERR, "TAP invalid remote interface name (%s)",
2148                                 value);
2149                         return -1;
2150                 }
2151                 strlcpy(name, value, RTE_ETH_NAME_MAX_LEN);
2152         }
2153
2154         return 0;
2155 }
2156
2157 static int parse_user_mac(struct rte_ether_addr *user_mac,
2158                 const char *value)
2159 {
2160         unsigned int index = 0;
2161         char mac_temp[strlen(ETH_TAP_USR_MAC_FMT) + 1], *mac_byte = NULL;
2162
2163         if (user_mac == NULL || value == NULL)
2164                 return 0;
2165
2166         strlcpy(mac_temp, value, sizeof(mac_temp));
2167         mac_byte = strtok(mac_temp, ":");
2168
2169         while ((mac_byte != NULL) &&
2170                         (strlen(mac_byte) <= 2) &&
2171                         (strlen(mac_byte) == strspn(mac_byte,
2172                                         ETH_TAP_CMP_MAC_FMT))) {
2173                 user_mac->addr_bytes[index++] = strtoul(mac_byte, NULL, 16);
2174                 mac_byte = strtok(NULL, ":");
2175         }
2176
2177         return index;
2178 }
2179
2180 static int
2181 set_mac_type(const char *key __rte_unused,
2182              const char *value,
2183              void *extra_args)
2184 {
2185         struct rte_ether_addr *user_mac = extra_args;
2186
2187         if (!value)
2188                 return 0;
2189
2190         if (!strncasecmp(ETH_TAP_MAC_FIXED, value, strlen(ETH_TAP_MAC_FIXED))) {
2191                 static int iface_idx;
2192
2193                 /* fixed mac = 00:64:74:61:70:<iface_idx> */
2194                 memcpy((char *)user_mac->addr_bytes, "\0dtap",
2195                         RTE_ETHER_ADDR_LEN);
2196                 user_mac->addr_bytes[RTE_ETHER_ADDR_LEN - 1] =
2197                         iface_idx++ + '0';
2198                 goto success;
2199         }
2200
2201         if (parse_user_mac(user_mac, value) != 6)
2202                 goto error;
2203 success:
2204         TAP_LOG(DEBUG, "TAP user MAC param (%s)", value);
2205         return 0;
2206
2207 error:
2208         TAP_LOG(ERR, "TAP user MAC (%s) is not in format (%s|%s)",
2209                 value, ETH_TAP_MAC_FIXED, ETH_TAP_USR_MAC_FMT);
2210         return -1;
2211 }
2212
2213 /*
2214  * Open a TUN interface device. TUN PMD
2215  * 1) sets tap_type as false
2216  * 2) intakes iface as argument.
2217  * 3) as interface is virtual set speed to 10G
2218  */
2219 static int
2220 rte_pmd_tun_probe(struct rte_vdev_device *dev)
2221 {
2222         const char *name, *params;
2223         int ret;
2224         struct rte_kvargs *kvlist = NULL;
2225         char tun_name[RTE_ETH_NAME_MAX_LEN];
2226         char remote_iface[RTE_ETH_NAME_MAX_LEN];
2227         struct rte_eth_dev *eth_dev;
2228
2229         name = rte_vdev_device_name(dev);
2230         params = rte_vdev_device_args(dev);
2231         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
2232
2233         if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
2234             strlen(params) == 0) {
2235                 eth_dev = rte_eth_dev_attach_secondary(name);
2236                 if (!eth_dev) {
2237                         TAP_LOG(ERR, "Failed to probe %s", name);
2238                         return -1;
2239                 }
2240                 eth_dev->dev_ops = &ops;
2241                 eth_dev->device = &dev->device;
2242                 rte_eth_dev_probing_finish(eth_dev);
2243                 return 0;
2244         }
2245
2246         /* use tun%d which causes kernel to choose next available */
2247         strlcpy(tun_name, DEFAULT_TUN_NAME "%d", RTE_ETH_NAME_MAX_LEN);
2248
2249         if (params && (params[0] != '\0')) {
2250                 TAP_LOG(DEBUG, "parameters (%s)", params);
2251
2252                 kvlist = rte_kvargs_parse(params, valid_arguments);
2253                 if (kvlist) {
2254                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
2255                                 ret = rte_kvargs_process(kvlist,
2256                                         ETH_TAP_IFACE_ARG,
2257                                         &set_interface_name,
2258                                         tun_name);
2259
2260                                 if (ret == -1)
2261                                         goto leave;
2262                         }
2263                 }
2264         }
2265         pmd_link.link_speed = ETH_SPEED_NUM_10G;
2266
2267         TAP_LOG(DEBUG, "Initializing pmd_tun for %s", name);
2268
2269         ret = eth_dev_tap_create(dev, tun_name, remote_iface, 0,
2270                                  ETH_TUNTAP_TYPE_TUN);
2271
2272 leave:
2273         if (ret == -1) {
2274                 TAP_LOG(ERR, "Failed to create pmd for %s as %s",
2275                         name, tun_name);
2276         }
2277         rte_kvargs_free(kvlist);
2278
2279         return ret;
2280 }
2281
2282 /* Request queue file descriptors from secondary to primary. */
2283 static int
2284 tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev)
2285 {
2286         int ret;
2287         struct timespec timeout = {.tv_sec = 1, .tv_nsec = 0};
2288         struct rte_mp_msg request, *reply;
2289         struct rte_mp_reply replies;
2290         struct ipc_queues *request_param = (struct ipc_queues *)request.param;
2291         struct ipc_queues *reply_param;
2292         struct pmd_process_private *process_private = dev->process_private;
2293         int queue, fd_iterator;
2294
2295         /* Prepare the request */
2296         memset(&request, 0, sizeof(request));
2297         strlcpy(request.name, TAP_MP_KEY, sizeof(request.name));
2298         strlcpy(request_param->port_name, port_name,
2299                 sizeof(request_param->port_name));
2300         request.len_param = sizeof(*request_param);
2301         /* Send request and receive reply */
2302         ret = rte_mp_request_sync(&request, &replies, &timeout);
2303         if (ret < 0 || replies.nb_received != 1) {
2304                 TAP_LOG(ERR, "Failed to request queues from primary: %d",
2305                         rte_errno);
2306                 return -1;
2307         }
2308         reply = &replies.msgs[0];
2309         reply_param = (struct ipc_queues *)reply->param;
2310         TAP_LOG(DEBUG, "Received IPC reply for %s", reply_param->port_name);
2311
2312         /* Attach the queues from received file descriptors */
2313         if (reply_param->rxq_count + reply_param->txq_count != reply->num_fds) {
2314                 TAP_LOG(ERR, "Unexpected number of fds received");
2315                 return -1;
2316         }
2317
2318         dev->data->nb_rx_queues = reply_param->rxq_count;
2319         dev->data->nb_tx_queues = reply_param->txq_count;
2320         fd_iterator = 0;
2321         for (queue = 0; queue < reply_param->rxq_count; queue++)
2322                 process_private->rxq_fds[queue] = reply->fds[fd_iterator++];
2323         for (queue = 0; queue < reply_param->txq_count; queue++)
2324                 process_private->txq_fds[queue] = reply->fds[fd_iterator++];
2325         free(reply);
2326         return 0;
2327 }
2328
2329 /* Send the queue file descriptors from the primary process to secondary. */
2330 static int
2331 tap_mp_sync_queues(const struct rte_mp_msg *request, const void *peer)
2332 {
2333         struct rte_eth_dev *dev;
2334         struct pmd_process_private *process_private;
2335         struct rte_mp_msg reply;
2336         const struct ipc_queues *request_param =
2337                 (const struct ipc_queues *)request->param;
2338         struct ipc_queues *reply_param =
2339                 (struct ipc_queues *)reply.param;
2340         uint16_t port_id;
2341         int queue;
2342         int ret;
2343
2344         /* Get requested port */
2345         TAP_LOG(DEBUG, "Received IPC request for %s", request_param->port_name);
2346         ret = rte_eth_dev_get_port_by_name(request_param->port_name, &port_id);
2347         if (ret) {
2348                 TAP_LOG(ERR, "Failed to get port id for %s",
2349                         request_param->port_name);
2350                 return -1;
2351         }
2352         dev = &rte_eth_devices[port_id];
2353         process_private = dev->process_private;
2354
2355         /* Fill file descriptors for all queues */
2356         reply.num_fds = 0;
2357         reply_param->rxq_count = 0;
2358         if (dev->data->nb_rx_queues + dev->data->nb_tx_queues >
2359                         RTE_MP_MAX_FD_NUM){
2360                 TAP_LOG(ERR, "Number of rx/tx queues exceeds max number of fds");
2361                 return -1;
2362         }
2363
2364         for (queue = 0; queue < dev->data->nb_rx_queues; queue++) {
2365                 reply.fds[reply.num_fds++] = process_private->rxq_fds[queue];
2366                 reply_param->rxq_count++;
2367         }
2368         RTE_ASSERT(reply_param->rxq_count == dev->data->nb_rx_queues);
2369
2370         reply_param->txq_count = 0;
2371         for (queue = 0; queue < dev->data->nb_tx_queues; queue++) {
2372                 reply.fds[reply.num_fds++] = process_private->txq_fds[queue];
2373                 reply_param->txq_count++;
2374         }
2375         RTE_ASSERT(reply_param->txq_count == dev->data->nb_tx_queues);
2376
2377         /* Send reply */
2378         strlcpy(reply.name, request->name, sizeof(reply.name));
2379         strlcpy(reply_param->port_name, request_param->port_name,
2380                 sizeof(reply_param->port_name));
2381         reply.len_param = sizeof(*reply_param);
2382         if (rte_mp_reply(&reply, peer) < 0) {
2383                 TAP_LOG(ERR, "Failed to reply an IPC request to sync queues");
2384                 return -1;
2385         }
2386         return 0;
2387 }
2388
2389 /* Open a TAP interface device.
2390  */
2391 static int
2392 rte_pmd_tap_probe(struct rte_vdev_device *dev)
2393 {
2394         const char *name, *params;
2395         int ret;
2396         struct rte_kvargs *kvlist = NULL;
2397         int speed;
2398         char tap_name[RTE_ETH_NAME_MAX_LEN];
2399         char remote_iface[RTE_ETH_NAME_MAX_LEN];
2400         struct rte_ether_addr user_mac = { .addr_bytes = {0} };
2401         struct rte_eth_dev *eth_dev;
2402         int tap_devices_count_increased = 0;
2403
2404         name = rte_vdev_device_name(dev);
2405         params = rte_vdev_device_args(dev);
2406
2407         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
2408                 eth_dev = rte_eth_dev_attach_secondary(name);
2409                 if (!eth_dev) {
2410                         TAP_LOG(ERR, "Failed to probe %s", name);
2411                         return -1;
2412                 }
2413                 eth_dev->dev_ops = &ops;
2414                 eth_dev->device = &dev->device;
2415                 eth_dev->rx_pkt_burst = pmd_rx_burst;
2416                 eth_dev->tx_pkt_burst = pmd_tx_burst;
2417                 if (!rte_eal_primary_proc_alive(NULL)) {
2418                         TAP_LOG(ERR, "Primary process is missing");
2419                         return -1;
2420                 }
2421                 eth_dev->process_private = (struct pmd_process_private *)
2422                         rte_zmalloc_socket(name,
2423                                 sizeof(struct pmd_process_private),
2424                                 RTE_CACHE_LINE_SIZE,
2425                                 eth_dev->device->numa_node);
2426                 if (eth_dev->process_private == NULL) {
2427                         TAP_LOG(ERR,
2428                                 "Failed to alloc memory for process private");
2429                         return -1;
2430                 }
2431
2432                 ret = tap_mp_attach_queues(name, eth_dev);
2433                 if (ret != 0)
2434                         return -1;
2435                 rte_eth_dev_probing_finish(eth_dev);
2436                 return 0;
2437         }
2438
2439         speed = ETH_SPEED_NUM_10G;
2440
2441         /* use tap%d which causes kernel to choose next available */
2442         strlcpy(tap_name, DEFAULT_TAP_NAME "%d", RTE_ETH_NAME_MAX_LEN);
2443         memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
2444
2445         if (params && (params[0] != '\0')) {
2446                 TAP_LOG(DEBUG, "parameters (%s)", params);
2447
2448                 kvlist = rte_kvargs_parse(params, valid_arguments);
2449                 if (kvlist) {
2450                         if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) {
2451                                 ret = rte_kvargs_process(kvlist,
2452                                                          ETH_TAP_IFACE_ARG,
2453                                                          &set_interface_name,
2454                                                          tap_name);
2455                                 if (ret == -1)
2456                                         goto leave;
2457                         }
2458
2459                         if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) {
2460                                 ret = rte_kvargs_process(kvlist,
2461                                                          ETH_TAP_REMOTE_ARG,
2462                                                          &set_remote_iface,
2463                                                          remote_iface);
2464                                 if (ret == -1)
2465                                         goto leave;
2466                         }
2467
2468                         if (rte_kvargs_count(kvlist, ETH_TAP_MAC_ARG) == 1) {
2469                                 ret = rte_kvargs_process(kvlist,
2470                                                          ETH_TAP_MAC_ARG,
2471                                                          &set_mac_type,
2472                                                          &user_mac);
2473                                 if (ret == -1)
2474                                         goto leave;
2475                         }
2476                 }
2477         }
2478         pmd_link.link_speed = speed;
2479
2480         TAP_LOG(DEBUG, "Initializing pmd_tap for %s", name);
2481
2482         /* Register IPC feed callback */
2483         if (!tap_devices_count) {
2484                 ret = rte_mp_action_register(TAP_MP_KEY, tap_mp_sync_queues);
2485                 if (ret < 0 && rte_errno != ENOTSUP) {
2486                         TAP_LOG(ERR, "tap: Failed to register IPC callback: %s",
2487                                 strerror(rte_errno));
2488                         goto leave;
2489                 }
2490         }
2491         tap_devices_count++;
2492         tap_devices_count_increased = 1;
2493         ret = eth_dev_tap_create(dev, tap_name, remote_iface, &user_mac,
2494                 ETH_TUNTAP_TYPE_TAP);
2495
2496 leave:
2497         if (ret == -1) {
2498                 TAP_LOG(ERR, "Failed to create pmd for %s as %s",
2499                         name, tap_name);
2500                 if (tap_devices_count_increased == 1) {
2501                         if (tap_devices_count == 1)
2502                                 rte_mp_action_unregister(TAP_MP_KEY);
2503                         tap_devices_count--;
2504                 }
2505         }
2506         rte_kvargs_free(kvlist);
2507
2508         return ret;
2509 }
2510
2511 /* detach a TUNTAP device.
2512  */
2513 static int
2514 rte_pmd_tap_remove(struct rte_vdev_device *dev)
2515 {
2516         struct rte_eth_dev *eth_dev = NULL;
2517
2518         /* find the ethdev entry */
2519         eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
2520         if (!eth_dev)
2521                 return 0;
2522
2523         tap_dev_close(eth_dev);
2524         rte_eth_dev_release_port(eth_dev);
2525
2526         return 0;
2527 }
2528
2529 static struct rte_vdev_driver pmd_tun_drv = {
2530         .probe = rte_pmd_tun_probe,
2531         .remove = rte_pmd_tap_remove,
2532 };
2533
2534 static struct rte_vdev_driver pmd_tap_drv = {
2535         .probe = rte_pmd_tap_probe,
2536         .remove = rte_pmd_tap_remove,
2537 };
2538
2539 RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv);
2540 RTE_PMD_REGISTER_VDEV(net_tun, pmd_tun_drv);
2541 RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap);
2542 RTE_PMD_REGISTER_PARAM_STRING(net_tun,
2543                               ETH_TAP_IFACE_ARG "=<string> ");
2544 RTE_PMD_REGISTER_PARAM_STRING(net_tap,
2545                               ETH_TAP_IFACE_ARG "=<string> "
2546                               ETH_TAP_MAC_ARG "=" ETH_TAP_MAC_ARG_FMT " "
2547                               ETH_TAP_REMOTE_ARG "=<string>");
2548 RTE_LOG_REGISTER_DEFAULT(tap_logtype, NOTICE);