drivers/net/vhost/rte_eth_vhost.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright (c) 2016 IGEL Co., Ltd.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of IGEL Co.,Ltd. nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 #include <unistd.h>
  34 #include <pthread.h>
  35 #include <stdbool.h>
  36 #ifdef RTE_LIBRTE_VHOST_NUMA
  37 #include <numaif.h>
  38 #endif
  39
  40 #include <rte_mbuf.h>
  41 #include <rte_ethdev.h>
  42 #include <rte_malloc.h>
  43 #include <rte_memcpy.h>
  44 #include <rte_vdev.h>
  45 #include <rte_kvargs.h>
  46 #include <rte_virtio_net.h>
  47 #include <rte_spinlock.h>
  48
  49 #include "rte_eth_vhost.h"
  50
  51 #define ETH_VHOST_IFACE_ARG             "iface"
  52 #define ETH_VHOST_QUEUES_ARG            "queues"
  53 #define ETH_VHOST_CLIENT_ARG            "client"
  54 #define ETH_VHOST_DEQUEUE_ZERO_COPY     "dequeue-zero-copy"
  55
  56 static const char *drivername = "VHOST PMD";
  57
  58 static const char *valid_arguments[] = {
  59         ETH_VHOST_IFACE_ARG,
  60         ETH_VHOST_QUEUES_ARG,
  61         ETH_VHOST_CLIENT_ARG,
  62         ETH_VHOST_DEQUEUE_ZERO_COPY,
  63         NULL
  64 };
  65
  66 static struct ether_addr base_eth_addr = {
  67         .addr_bytes = {
  68                 0x56 /* V */,
  69                 0x48 /* H */,
  70                 0x4F /* O */,
  71                 0x53 /* S */,
  72                 0x54 /* T */,
  73                 0x00
  74         }
  75 };
  76
  77 enum vhost_xstats_pkts {
  78         VHOST_UNDERSIZE_PKT = 0,
  79         VHOST_64_PKT,
  80         VHOST_65_TO_127_PKT,
  81         VHOST_128_TO_255_PKT,
  82         VHOST_256_TO_511_PKT,
  83         VHOST_512_TO_1023_PKT,
  84         VHOST_1024_TO_1522_PKT,
  85         VHOST_1523_TO_MAX_PKT,
  86         VHOST_BROADCAST_PKT,
  87         VHOST_MULTICAST_PKT,
  88         VHOST_UNICAST_PKT,
  89         VHOST_ERRORS_PKT,
  90         VHOST_ERRORS_FRAGMENTED,
  91         VHOST_ERRORS_JABBER,
  92         VHOST_UNKNOWN_PROTOCOL,
  93         VHOST_XSTATS_MAX,
  94 };
  95
  96 struct vhost_stats {
  97         uint64_t pkts;
  98         uint64_t bytes;
  99         uint64_t missed_pkts;
 100         uint64_t xstats[VHOST_XSTATS_MAX];
 101 };
 102
 103 struct vhost_queue {
 104         int vid;
 105         rte_atomic32_t allow_queuing;
 106         rte_atomic32_t while_queuing;
 107         struct pmd_internal *internal;
 108         struct rte_mempool *mb_pool;
 109         uint8_t port;
 110         uint16_t virtqueue_id;
 111         struct vhost_stats stats;
 112 };
 113
 114 struct pmd_internal {
 115         char *dev_name;
 116         char *iface_name;
 117         uint16_t max_queues;
 118         uint64_t flags;
 119
 120         volatile uint16_t once;
 121 };
 122
 123 struct internal_list {
 124         TAILQ_ENTRY(internal_list) next;
 125         struct rte_eth_dev *eth_dev;
 126 };
 127
 128 TAILQ_HEAD(internal_list_head, internal_list);
 129 static struct internal_list_head internal_list =
 130         TAILQ_HEAD_INITIALIZER(internal_list);
 131
 132 static pthread_mutex_t internal_list_lock = PTHREAD_MUTEX_INITIALIZER;
 133
 134 static rte_atomic16_t nb_started_ports;
 135 static pthread_t session_th;
 136
 137 static struct rte_eth_link pmd_link = {
 138                 .link_speed = 10000,
 139                 .link_duplex = ETH_LINK_FULL_DUPLEX,
 140                 .link_status = ETH_LINK_DOWN
 141 };
 142
 143 struct rte_vhost_vring_state {
 144         rte_spinlock_t lock;
 145
 146         bool cur[RTE_MAX_QUEUES_PER_PORT * 2];
 147         bool seen[RTE_MAX_QUEUES_PER_PORT * 2];
 148         unsigned int index;
 149         unsigned int max_vring;
 150 };
 151
 152 static struct rte_vhost_vring_state *vring_states[RTE_MAX_ETHPORTS];
 153
 154 #define VHOST_XSTATS_NAME_SIZE 64
 155
 156 struct vhost_xstats_name_off {
 157         char name[VHOST_XSTATS_NAME_SIZE];
 158         uint64_t offset;
 159 };
 160
 161 /* [rx]_is prepended to the name string here */
 162 static const struct vhost_xstats_name_off vhost_rxport_stat_strings[] = {
 163         {"good_packets",
 164          offsetof(struct vhost_queue, stats.pkts)},
 165         {"total_bytes",
 166          offsetof(struct vhost_queue, stats.bytes)},
 167         {"missed_pkts",
 168          offsetof(struct vhost_queue, stats.missed_pkts)},
 169         {"broadcast_packets",
 170          offsetof(struct vhost_queue, stats.xstats[VHOST_BROADCAST_PKT])},
 171         {"multicast_packets",
 172          offsetof(struct vhost_queue, stats.xstats[VHOST_MULTICAST_PKT])},
 173         {"unicast_packets",
 174          offsetof(struct vhost_queue, stats.xstats[VHOST_UNICAST_PKT])},
 175          {"undersize_packets",
 176          offsetof(struct vhost_queue, stats.xstats[VHOST_UNDERSIZE_PKT])},
 177         {"size_64_packets",
 178          offsetof(struct vhost_queue, stats.xstats[VHOST_64_PKT])},
 179         {"size_65_to_127_packets",
 180          offsetof(struct vhost_queue, stats.xstats[VHOST_65_TO_127_PKT])},
 181         {"size_128_to_255_packets",
 182          offsetof(struct vhost_queue, stats.xstats[VHOST_128_TO_255_PKT])},
 183         {"size_256_to_511_packets",
 184          offsetof(struct vhost_queue, stats.xstats[VHOST_256_TO_511_PKT])},
 185         {"size_512_to_1023_packets",
 186          offsetof(struct vhost_queue, stats.xstats[VHOST_512_TO_1023_PKT])},
 187         {"size_1024_to_1522_packets",
 188          offsetof(struct vhost_queue, stats.xstats[VHOST_1024_TO_1522_PKT])},
 189         {"size_1523_to_max_packets",
 190          offsetof(struct vhost_queue, stats.xstats[VHOST_1523_TO_MAX_PKT])},
 191         {"errors_with_bad_CRC",
 192          offsetof(struct vhost_queue, stats.xstats[VHOST_ERRORS_PKT])},
 193         {"fragmented_errors",
 194          offsetof(struct vhost_queue, stats.xstats[VHOST_ERRORS_FRAGMENTED])},
 195         {"jabber_errors",
 196          offsetof(struct vhost_queue, stats.xstats[VHOST_ERRORS_JABBER])},
 197         {"unknown_protos_packets",
 198          offsetof(struct vhost_queue, stats.xstats[VHOST_UNKNOWN_PROTOCOL])},
 199 };
 200
 201 /* [tx]_ is prepended to the name string here */
 202 static const struct vhost_xstats_name_off vhost_txport_stat_strings[] = {
 203         {"good_packets",
 204          offsetof(struct vhost_queue, stats.pkts)},
 205         {"total_bytes",
 206          offsetof(struct vhost_queue, stats.bytes)},
 207         {"missed_pkts",
 208          offsetof(struct vhost_queue, stats.missed_pkts)},
 209         {"broadcast_packets",
 210          offsetof(struct vhost_queue, stats.xstats[VHOST_BROADCAST_PKT])},
 211         {"multicast_packets",
 212          offsetof(struct vhost_queue, stats.xstats[VHOST_MULTICAST_PKT])},
 213         {"unicast_packets",
 214          offsetof(struct vhost_queue, stats.xstats[VHOST_UNICAST_PKT])},
 215         {"undersize_packets",
 216          offsetof(struct vhost_queue, stats.xstats[VHOST_UNDERSIZE_PKT])},
 217         {"size_64_packets",
 218          offsetof(struct vhost_queue, stats.xstats[VHOST_64_PKT])},
 219         {"size_65_to_127_packets",
 220          offsetof(struct vhost_queue, stats.xstats[VHOST_65_TO_127_PKT])},
 221         {"size_128_to_255_packets",
 222          offsetof(struct vhost_queue, stats.xstats[VHOST_128_TO_255_PKT])},
 223         {"size_256_to_511_packets",
 224          offsetof(struct vhost_queue, stats.xstats[VHOST_256_TO_511_PKT])},
 225         {"size_512_to_1023_packets",
 226          offsetof(struct vhost_queue, stats.xstats[VHOST_512_TO_1023_PKT])},
 227         {"size_1024_to_1522_packets",
 228          offsetof(struct vhost_queue, stats.xstats[VHOST_1024_TO_1522_PKT])},
 229         {"size_1523_to_max_packets",
 230          offsetof(struct vhost_queue, stats.xstats[VHOST_1523_TO_MAX_PKT])},
 231         {"errors_with_bad_CRC",
 232          offsetof(struct vhost_queue, stats.xstats[VHOST_ERRORS_PKT])},
 233 };
 234
 235 #define VHOST_NB_XSTATS_RXPORT (sizeof(vhost_rxport_stat_strings) / \
 236                                 sizeof(vhost_rxport_stat_strings[0]))
 237
 238 #define VHOST_NB_XSTATS_TXPORT (sizeof(vhost_txport_stat_strings) / \
 239                                 sizeof(vhost_txport_stat_strings[0]))
 240
 241 static void
 242 vhost_dev_xstats_reset(struct rte_eth_dev *dev)
 243 {
 244         struct vhost_queue *vq = NULL;
 245         unsigned int i = 0;
 246
 247         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 248                 vq = dev->data->rx_queues[i];
 249                 if (!vq)
 250                         continue;
 251                 memset(&vq->stats, 0, sizeof(vq->stats));
 252         }
 253         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 254                 vq = dev->data->tx_queues[i];
 255                 if (!vq)
 256                         continue;
 257                 memset(&vq->stats, 0, sizeof(vq->stats));
 258         }
 259 }
 260
 261 static int
 262 vhost_dev_xstats_get_names(struct rte_eth_dev *dev __rte_unused,
 263                            struct rte_eth_xstat_name *xstats_names,
 264                            unsigned int limit __rte_unused)
 265 {
 266         unsigned int t = 0;
 267         int count = 0;
 268         int nstats = VHOST_NB_XSTATS_RXPORT + VHOST_NB_XSTATS_TXPORT;
 269
 270         if (!xstats_names)
 271                 return nstats;
 272         for (t = 0; t < VHOST_NB_XSTATS_RXPORT; t++) {
 273                 snprintf(xstats_names[count].name,
 274                          sizeof(xstats_names[count].name),
 275                          "rx_%s", vhost_rxport_stat_strings[t].name);
 276                 count++;
 277         }
 278         for (t = 0; t < VHOST_NB_XSTATS_TXPORT; t++) {
 279                 snprintf(xstats_names[count].name,
 280                          sizeof(xstats_names[count].name),
 281                          "tx_%s", vhost_txport_stat_strings[t].name);
 282                 count++;
 283         }
 284         return count;
 285 }
 286
 287 static int
 288 vhost_dev_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
 289                      unsigned int n)
 290 {
 291         unsigned int i;
 292         unsigned int t;
 293         unsigned int count = 0;
 294         struct vhost_queue *vq = NULL;
 295         unsigned int nxstats = VHOST_NB_XSTATS_RXPORT + VHOST_NB_XSTATS_TXPORT;
 296
 297         if (n < nxstats)
 298                 return nxstats;
 299
 300         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 301                 vq = dev->data->rx_queues[i];
 302                 if (!vq)
 303                         continue;
 304                 vq->stats.xstats[VHOST_UNICAST_PKT] = vq->stats.pkts
 305                                 - (vq->stats.xstats[VHOST_BROADCAST_PKT]
 306                                 + vq->stats.xstats[VHOST_MULTICAST_PKT]);
 307         }
 308         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 309                 vq = dev->data->tx_queues[i];
 310                 if (!vq)
 311                         continue;
 312                 vq->stats.xstats[VHOST_UNICAST_PKT] = vq->stats.pkts
 313                                 + vq->stats.missed_pkts
 314                                 - (vq->stats.xstats[VHOST_BROADCAST_PKT]
 315                                 + vq->stats.xstats[VHOST_MULTICAST_PKT]);
 316         }
 317         for (t = 0; t < VHOST_NB_XSTATS_RXPORT; t++) {
 318                 xstats[count].value = 0;
 319                 for (i = 0; i < dev->data->nb_rx_queues; i++) {
 320                         vq = dev->data->rx_queues[i];
 321                         if (!vq)
 322                                 continue;
 323                         xstats[count].value +=
 324                                 *(uint64_t *)(((char *)vq)
 325                                 + vhost_rxport_stat_strings[t].offset);
 326                 }
 327                 count++;
 328         }
 329         for (t = 0; t < VHOST_NB_XSTATS_TXPORT; t++) {
 330                 xstats[count].value = 0;
 331                 for (i = 0; i < dev->data->nb_tx_queues; i++) {
 332                         vq = dev->data->tx_queues[i];
 333                         if (!vq)
 334                                 continue;
 335                         xstats[count].value +=
 336                                 *(uint64_t *)(((char *)vq)
 337                                 + vhost_txport_stat_strings[t].offset);
 338                 }
 339                 count++;
 340         }
 341         return count;
 342 }
 343
 344 static inline void
 345 vhost_count_multicast_broadcast(struct vhost_queue *vq,
 346                                 struct rte_mbuf *mbuf)
 347 {
 348         struct ether_addr *ea = NULL;
 349         struct vhost_stats *pstats = &vq->stats;
 350
 351         ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
 352         if (is_multicast_ether_addr(ea)) {
 353                 if (is_broadcast_ether_addr(ea))
 354                         pstats->xstats[VHOST_BROADCAST_PKT]++;
 355                 else
 356                         pstats->xstats[VHOST_MULTICAST_PKT]++;
 357         }
 358 }
 359
 360 static void
 361 vhost_update_packet_xstats(struct vhost_queue *vq,
 362                            struct rte_mbuf **bufs,
 363                            uint16_t count)
 364 {
 365         uint32_t pkt_len = 0;
 366         uint64_t i = 0;
 367         uint64_t index;
 368         struct vhost_stats *pstats = &vq->stats;
 369
 370         for (i = 0; i < count ; i++) {
 371                 pkt_len = bufs[i]->pkt_len;
 372                 if (pkt_len == 64) {
 373                         pstats->xstats[VHOST_64_PKT]++;
 374                 } else if (pkt_len > 64 && pkt_len < 1024) {
 375                         index = (sizeof(pkt_len) * 8)
 376                                 - __builtin_clz(pkt_len) - 5;
 377                         pstats->xstats[index]++;
 378                 } else {
 379                         if (pkt_len < 64)
 380                                 pstats->xstats[VHOST_UNDERSIZE_PKT]++;
 381                         else if (pkt_len <= 1522)
 382                                 pstats->xstats[VHOST_1024_TO_1522_PKT]++;
 383                         else if (pkt_len > 1522)
 384                                 pstats->xstats[VHOST_1523_TO_MAX_PKT]++;
 385                 }
 386                 vhost_count_multicast_broadcast(vq, bufs[i]);
 387         }
 388 }
 389
 390 static uint16_t
 391 eth_vhost_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
 392 {
 393         struct vhost_queue *r = q;
 394         uint16_t i, nb_rx = 0;
 395
 396         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 397                 return 0;
 398
 399         rte_atomic32_set(&r->while_queuing, 1);
 400
 401         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 402                 goto out;
 403
 404         /* Dequeue packets from guest TX queue */
 405         nb_rx = rte_vhost_dequeue_burst(r->vid,
 406                         r->virtqueue_id, r->mb_pool, bufs, nb_bufs);
 407
 408         r->stats.pkts += nb_rx;
 409
 410         for (i = 0; likely(i < nb_rx); i++) {
 411                 bufs[i]->port = r->port;
 412                 r->stats.bytes += bufs[i]->pkt_len;
 413         }
 414
 415         vhost_update_packet_xstats(r, bufs, nb_rx);
 416
 417 out:
 418         rte_atomic32_set(&r->while_queuing, 0);
 419
 420         return nb_rx;
 421 }
 422
 423 static uint16_t
 424 eth_vhost_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
 425 {
 426         struct vhost_queue *r = q;
 427         uint16_t i, nb_tx = 0;
 428
 429         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 430                 return 0;
 431
 432         rte_atomic32_set(&r->while_queuing, 1);
 433
 434         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 435                 goto out;
 436
 437         /* Enqueue packets to guest RX queue */
 438         nb_tx = rte_vhost_enqueue_burst(r->vid,
 439                         r->virtqueue_id, bufs, nb_bufs);
 440
 441         r->stats.pkts += nb_tx;
 442         r->stats.missed_pkts += nb_bufs - nb_tx;
 443
 444         for (i = 0; likely(i < nb_tx); i++)
 445                 r->stats.bytes += bufs[i]->pkt_len;
 446
 447         vhost_update_packet_xstats(r, bufs, nb_tx);
 448
 449         /* According to RFC2863 page42 section ifHCOutMulticastPkts and
 450          * ifHCOutBroadcastPkts, the counters "multicast" and "broadcast"
 451          * are increased when packets are not transmitted successfully.
 452          */
 453         for (i = nb_tx; i < nb_bufs; i++)
 454                 vhost_count_multicast_broadcast(r, bufs[i]);
 455
 456         for (i = 0; likely(i < nb_tx); i++)
 457                 rte_pktmbuf_free(bufs[i]);
 458 out:
 459         rte_atomic32_set(&r->while_queuing, 0);
 460
 461         return nb_tx;
 462 }
 463
 464 static int
 465 eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
 466 {
 467         return 0;
 468 }
 469
 470 static inline struct internal_list *
 471 find_internal_resource(char *ifname)
 472 {
 473         int found = 0;
 474         struct internal_list *list;
 475         struct pmd_internal *internal;
 476
 477         if (ifname == NULL)
 478                 return NULL;
 479
 480         pthread_mutex_lock(&internal_list_lock);
 481
 482         TAILQ_FOREACH(list, &internal_list, next) {
 483                 internal = list->eth_dev->data->dev_private;
 484                 if (!strcmp(internal->iface_name, ifname)) {
 485                         found = 1;
 486                         break;
 487                 }
 488         }
 489
 490         pthread_mutex_unlock(&internal_list_lock);
 491
 492         if (!found)
 493                 return NULL;
 494
 495         return list;
 496 }
 497
 498 static int
 499 new_device(int vid)
 500 {
 501         struct rte_eth_dev *eth_dev;
 502         struct internal_list *list;
 503         struct pmd_internal *internal;
 504         struct vhost_queue *vq;
 505         unsigned i;
 506         char ifname[PATH_MAX];
 507 #ifdef RTE_LIBRTE_VHOST_NUMA
 508         int newnode;
 509 #endif
 510
 511         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 512         list = find_internal_resource(ifname);
 513         if (list == NULL) {
 514                 RTE_LOG(INFO, PMD, "Invalid device name: %s\n", ifname);
 515                 return -1;
 516         }
 517
 518         eth_dev = list->eth_dev;
 519         internal = eth_dev->data->dev_private;
 520
 521 #ifdef RTE_LIBRTE_VHOST_NUMA
 522         newnode = rte_vhost_get_numa_node(vid);
 523         if (newnode >= 0)
 524                 eth_dev->data->numa_node = newnode;
 525 #endif
 526
 527         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 528                 vq = eth_dev->data->rx_queues[i];
 529                 if (vq == NULL)
 530                         continue;
 531                 vq->vid = vid;
 532                 vq->internal = internal;
 533                 vq->port = eth_dev->data->port_id;
 534         }
 535         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 536                 vq = eth_dev->data->tx_queues[i];
 537                 if (vq == NULL)
 538                         continue;
 539                 vq->vid = vid;
 540                 vq->internal = internal;
 541                 vq->port = eth_dev->data->port_id;
 542         }
 543
 544         for (i = 0; i < rte_vhost_get_queue_num(vid) * VIRTIO_QNUM; i++)
 545                 rte_vhost_enable_guest_notification(vid, i, 0);
 546
 547         eth_dev->data->dev_link.link_status = ETH_LINK_UP;
 548
 549         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 550                 vq = eth_dev->data->rx_queues[i];
 551                 if (vq == NULL)
 552                         continue;
 553                 rte_atomic32_set(&vq->allow_queuing, 1);
 554         }
 555         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 556                 vq = eth_dev->data->tx_queues[i];
 557                 if (vq == NULL)
 558                         continue;
 559                 rte_atomic32_set(&vq->allow_queuing, 1);
 560         }
 561
 562         RTE_LOG(INFO, PMD, "New connection established\n");
 563
 564         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC);
 565
 566         return 0;
 567 }
 568
 569 static void
 570 destroy_device(int vid)
 571 {
 572         struct rte_eth_dev *eth_dev;
 573         struct vhost_queue *vq;
 574         struct internal_list *list;
 575         char ifname[PATH_MAX];
 576         unsigned i;
 577         struct rte_vhost_vring_state *state;
 578
 579         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 580         list = find_internal_resource(ifname);
 581         if (list == NULL) {
 582                 RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname);
 583                 return;
 584         }
 585         eth_dev = list->eth_dev;
 586
 587         /* Wait until rx/tx_pkt_burst stops accessing vhost device */
 588         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 589                 vq = eth_dev->data->rx_queues[i];
 590                 if (vq == NULL)
 591                         continue;
 592                 rte_atomic32_set(&vq->allow_queuing, 0);
 593                 while (rte_atomic32_read(&vq->while_queuing))
 594                         rte_pause();
 595         }
 596         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 597                 vq = eth_dev->data->tx_queues[i];
 598                 if (vq == NULL)
 599                         continue;
 600                 rte_atomic32_set(&vq->allow_queuing, 0);
 601                 while (rte_atomic32_read(&vq->while_queuing))
 602                         rte_pause();
 603         }
 604
 605         eth_dev->data->dev_link.link_status = ETH_LINK_DOWN;
 606
 607         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 608                 vq = eth_dev->data->rx_queues[i];
 609                 if (vq == NULL)
 610                         continue;
 611                 vq->vid = -1;
 612         }
 613         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 614                 vq = eth_dev->data->tx_queues[i];
 615                 if (vq == NULL)
 616                         continue;
 617                 vq->vid = -1;
 618         }
 619
 620         state = vring_states[eth_dev->data->port_id];
 621         rte_spinlock_lock(&state->lock);
 622         for (i = 0; i <= state->max_vring; i++) {
 623                 state->cur[i] = false;
 624                 state->seen[i] = false;
 625         }
 626         state->max_vring = 0;
 627         rte_spinlock_unlock(&state->lock);
 628
 629         RTE_LOG(INFO, PMD, "Connection closed\n");
 630
 631         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC);
 632 }
 633
 634 static int
 635 vring_state_changed(int vid, uint16_t vring, int enable)
 636 {
 637         struct rte_vhost_vring_state *state;
 638         struct rte_eth_dev *eth_dev;
 639         struct internal_list *list;
 640         char ifname[PATH_MAX];
 641
 642         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 643         list = find_internal_resource(ifname);
 644         if (list == NULL) {
 645                 RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname);
 646                 return -1;
 647         }
 648
 649         eth_dev = list->eth_dev;
 650         /* won't be NULL */
 651         state = vring_states[eth_dev->data->port_id];
 652         rte_spinlock_lock(&state->lock);
 653         state->cur[vring] = enable;
 654         state->max_vring = RTE_MAX(vring, state->max_vring);
 655         rte_spinlock_unlock(&state->lock);
 656
 657         RTE_LOG(INFO, PMD, "vring%u is %s\n",
 658                         vring, enable ? "enabled" : "disabled");
 659
 660         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_QUEUE_STATE);
 661
 662         return 0;
 663 }
 664
 665 int
 666 rte_eth_vhost_get_queue_event(uint8_t port_id,
 667                 struct rte_eth_vhost_queue_event *event)
 668 {
 669         struct rte_vhost_vring_state *state;
 670         unsigned int i;
 671         int idx;
 672
 673         if (port_id >= RTE_MAX_ETHPORTS) {
 674                 RTE_LOG(ERR, PMD, "Invalid port id\n");
 675                 return -1;
 676         }
 677
 678         state = vring_states[port_id];
 679         if (!state) {
 680                 RTE_LOG(ERR, PMD, "Unused port\n");
 681                 return -1;
 682         }
 683
 684         rte_spinlock_lock(&state->lock);
 685         for (i = 0; i <= state->max_vring; i++) {
 686                 idx = state->index++ % (state->max_vring + 1);
 687
 688                 if (state->cur[idx] != state->seen[idx]) {
 689                         state->seen[idx] = state->cur[idx];
 690                         event->queue_id = idx / 2;
 691                         event->rx = idx & 1;
 692                         event->enable = state->cur[idx];
 693                         rte_spinlock_unlock(&state->lock);
 694                         return 0;
 695                 }
 696         }
 697         rte_spinlock_unlock(&state->lock);
 698
 699         return -1;
 700 }
 701
 702 int
 703 rte_eth_vhost_get_vid_from_port_id(uint8_t port_id)
 704 {
 705         struct internal_list *list;
 706         struct rte_eth_dev *eth_dev;
 707         struct vhost_queue *vq;
 708         int vid = -1;
 709
 710         if (!rte_eth_dev_is_valid_port(port_id))
 711                 return -1;
 712
 713         pthread_mutex_lock(&internal_list_lock);
 714
 715         TAILQ_FOREACH(list, &internal_list, next) {
 716                 eth_dev = list->eth_dev;
 717                 if (eth_dev->data->port_id == port_id) {
 718                         vq = eth_dev->data->rx_queues[0];
 719                         if (vq) {
 720                                 vid = vq->vid;
 721                         }
 722                         break;
 723                 }
 724         }
 725
 726         pthread_mutex_unlock(&internal_list_lock);
 727
 728         return vid;
 729 }
 730
 731 static void *
 732 vhost_driver_session(void *param __rte_unused)
 733 {
 734         static struct virtio_net_device_ops vhost_ops;
 735
 736         /* set vhost arguments */
 737         vhost_ops.new_device = new_device;
 738         vhost_ops.destroy_device = destroy_device;
 739         vhost_ops.vring_state_changed = vring_state_changed;
 740         if (rte_vhost_driver_callback_register(&vhost_ops) < 0)
 741                 RTE_LOG(ERR, PMD, "Can't register callbacks\n");
 742
 743         /* start event handling */
 744         rte_vhost_driver_session_start();
 745
 746         return NULL;
 747 }
 748
 749 static int
 750 vhost_driver_session_start(void)
 751 {
 752         int ret;
 753
 754         ret = pthread_create(&session_th,
 755                         NULL, vhost_driver_session, NULL);
 756         if (ret)
 757                 RTE_LOG(ERR, PMD, "Can't create a thread\n");
 758
 759         return ret;
 760 }
 761
 762 static void
 763 vhost_driver_session_stop(void)
 764 {
 765         int ret;
 766
 767         ret = pthread_cancel(session_th);
 768         if (ret)
 769                 RTE_LOG(ERR, PMD, "Can't cancel the thread\n");
 770
 771         ret = pthread_join(session_th, NULL);
 772         if (ret)
 773                 RTE_LOG(ERR, PMD, "Can't join the thread\n");
 774 }
 775
 776 static int
 777 eth_dev_start(struct rte_eth_dev *dev)
 778 {
 779         struct pmd_internal *internal = dev->data->dev_private;
 780         int ret = 0;
 781
 782         if (rte_atomic16_cmpset(&internal->once, 0, 1)) {
 783                 ret = rte_vhost_driver_register(internal->iface_name,
 784                                                 internal->flags);
 785                 if (ret)
 786                         return ret;
 787         }
 788
 789         /* We need only one message handling thread */
 790         if (rte_atomic16_add_return(&nb_started_ports, 1) == 1)
 791                 ret = vhost_driver_session_start();
 792
 793         return ret;
 794 }
 795
 796 static void
 797 eth_dev_stop(struct rte_eth_dev *dev)
 798 {
 799         struct pmd_internal *internal = dev->data->dev_private;
 800
 801         if (rte_atomic16_cmpset(&internal->once, 1, 0))
 802                 rte_vhost_driver_unregister(internal->iface_name);
 803
 804         if (rte_atomic16_sub_return(&nb_started_ports, 1) == 0)
 805                 vhost_driver_session_stop();
 806 }
 807
 808 static int
 809 eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 810                    uint16_t nb_rx_desc __rte_unused,
 811                    unsigned int socket_id,
 812                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 813                    struct rte_mempool *mb_pool)
 814 {
 815         struct vhost_queue *vq;
 816
 817         vq = rte_zmalloc_socket(NULL, sizeof(struct vhost_queue),
 818                         RTE_CACHE_LINE_SIZE, socket_id);
 819         if (vq == NULL) {
 820                 RTE_LOG(ERR, PMD, "Failed to allocate memory for rx queue\n");
 821                 return -ENOMEM;
 822         }
 823
 824         vq->mb_pool = mb_pool;
 825         vq->virtqueue_id = rx_queue_id * VIRTIO_QNUM + VIRTIO_TXQ;
 826         dev->data->rx_queues[rx_queue_id] = vq;
 827
 828         return 0;
 829 }
 830
 831 static int
 832 eth_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 833                    uint16_t nb_tx_desc __rte_unused,
 834                    unsigned int socket_id,
 835                    const struct rte_eth_txconf *tx_conf __rte_unused)
 836 {
 837         struct vhost_queue *vq;
 838
 839         vq = rte_zmalloc_socket(NULL, sizeof(struct vhost_queue),
 840                         RTE_CACHE_LINE_SIZE, socket_id);
 841         if (vq == NULL) {
 842                 RTE_LOG(ERR, PMD, "Failed to allocate memory for tx queue\n");
 843                 return -ENOMEM;
 844         }
 845
 846         vq->virtqueue_id = tx_queue_id * VIRTIO_QNUM + VIRTIO_RXQ;
 847         dev->data->tx_queues[tx_queue_id] = vq;
 848
 849         return 0;
 850 }
 851
 852 static void
 853 eth_dev_info(struct rte_eth_dev *dev,
 854              struct rte_eth_dev_info *dev_info)
 855 {
 856         struct pmd_internal *internal;
 857
 858         internal = dev->data->dev_private;
 859         if (internal == NULL) {
 860                 RTE_LOG(ERR, PMD, "Invalid device specified\n");
 861                 return;
 862         }
 863
 864         dev_info->driver_name = drivername;
 865         dev_info->max_mac_addrs = 1;
 866         dev_info->max_rx_pktlen = (uint32_t)-1;
 867         dev_info->max_rx_queues = internal->max_queues;
 868         dev_info->max_tx_queues = internal->max_queues;
 869         dev_info->min_rx_bufsize = 0;
 870 }
 871
 872 static void
 873 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 874 {
 875         unsigned i;
 876         unsigned long rx_total = 0, tx_total = 0, tx_missed_total = 0;
 877         unsigned long rx_total_bytes = 0, tx_total_bytes = 0;
 878         struct vhost_queue *vq;
 879
 880         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 881                         i < dev->data->nb_rx_queues; i++) {
 882                 if (dev->data->rx_queues[i] == NULL)
 883                         continue;
 884                 vq = dev->data->rx_queues[i];
 885                 stats->q_ipackets[i] = vq->stats.pkts;
 886                 rx_total += stats->q_ipackets[i];
 887
 888                 stats->q_ibytes[i] = vq->stats.bytes;
 889                 rx_total_bytes += stats->q_ibytes[i];
 890         }
 891
 892         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 893                         i < dev->data->nb_tx_queues; i++) {
 894                 if (dev->data->tx_queues[i] == NULL)
 895                         continue;
 896                 vq = dev->data->tx_queues[i];
 897                 stats->q_opackets[i] = vq->stats.pkts;
 898                 tx_missed_total += vq->stats.missed_pkts;
 899                 tx_total += stats->q_opackets[i];
 900
 901                 stats->q_obytes[i] = vq->stats.bytes;
 902                 tx_total_bytes += stats->q_obytes[i];
 903         }
 904
 905         stats->ipackets = rx_total;
 906         stats->opackets = tx_total;
 907         stats->oerrors = tx_missed_total;
 908         stats->ibytes = rx_total_bytes;
 909         stats->obytes = tx_total_bytes;
 910 }
 911
 912 static void
 913 eth_stats_reset(struct rte_eth_dev *dev)
 914 {
 915         struct vhost_queue *vq;
 916         unsigned i;
 917
 918         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 919                 if (dev->data->rx_queues[i] == NULL)
 920                         continue;
 921                 vq = dev->data->rx_queues[i];
 922                 vq->stats.pkts = 0;
 923                 vq->stats.bytes = 0;
 924         }
 925         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 926                 if (dev->data->tx_queues[i] == NULL)
 927                         continue;
 928                 vq = dev->data->tx_queues[i];
 929                 vq->stats.pkts = 0;
 930                 vq->stats.bytes = 0;
 931                 vq->stats.missed_pkts = 0;
 932         }
 933 }
 934
 935 static void
 936 eth_queue_release(void *q)
 937 {
 938         rte_free(q);
 939 }
 940
 941 static int
 942 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 943                 int wait_to_complete __rte_unused)
 944 {
 945         return 0;
 946 }
 947
 948 /**
 949  * Disable features in feature_mask. Returns 0 on success.
 950  */
 951 int
 952 rte_eth_vhost_feature_disable(uint64_t feature_mask)
 953 {
 954         return rte_vhost_feature_disable(feature_mask);
 955 }
 956
 957 /**
 958  * Enable features in feature_mask. Returns 0 on success.
 959  */
 960 int
 961 rte_eth_vhost_feature_enable(uint64_t feature_mask)
 962 {
 963         return rte_vhost_feature_enable(feature_mask);
 964 }
 965
 966 /* Returns currently supported vhost features */
 967 uint64_t
 968 rte_eth_vhost_feature_get(void)
 969 {
 970         return rte_vhost_feature_get();
 971 }
 972
 973 static const struct eth_dev_ops ops = {
 974         .dev_start = eth_dev_start,
 975         .dev_stop = eth_dev_stop,
 976         .dev_configure = eth_dev_configure,
 977         .dev_infos_get = eth_dev_info,
 978         .rx_queue_setup = eth_rx_queue_setup,
 979         .tx_queue_setup = eth_tx_queue_setup,
 980         .rx_queue_release = eth_queue_release,
 981         .tx_queue_release = eth_queue_release,
 982         .link_update = eth_link_update,
 983         .stats_get = eth_stats_get,
 984         .stats_reset = eth_stats_reset,
 985         .xstats_reset = vhost_dev_xstats_reset,
 986         .xstats_get = vhost_dev_xstats_get,
 987         .xstats_get_names = vhost_dev_xstats_get_names,
 988 };
 989
 990 static int
 991 eth_dev_vhost_create(const char *name, char *iface_name, int16_t queues,
 992                      const unsigned numa_node, uint64_t flags)
 993 {
 994         struct rte_eth_dev_data *data = NULL;
 995         struct pmd_internal *internal = NULL;
 996         struct rte_eth_dev *eth_dev = NULL;
 997         struct ether_addr *eth_addr = NULL;
 998         struct rte_vhost_vring_state *vring_state = NULL;
 999         struct internal_list *list = NULL;
1000
1001         RTE_LOG(INFO, PMD, "Creating VHOST-USER backend on numa socket %u\n",
1002                 numa_node);
1003
1004         /* now do all data allocation - for eth_dev structure, dummy pci driver
1005          * and internal (private) data
1006          */
1007         data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
1008         if (data == NULL)
1009                 goto error;
1010
1011         internal = rte_zmalloc_socket(name, sizeof(*internal), 0, numa_node);
1012         if (internal == NULL)
1013                 goto error;
1014
1015         list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
1016         if (list == NULL)
1017                 goto error;
1018
1019         /* reserve an ethdev entry */
1020         eth_dev = rte_eth_dev_allocate(name);
1021         if (eth_dev == NULL)
1022                 goto error;
1023
1024         eth_addr = rte_zmalloc_socket(name, sizeof(*eth_addr), 0, numa_node);
1025         if (eth_addr == NULL)
1026                 goto error;
1027         *eth_addr = base_eth_addr;
1028         eth_addr->addr_bytes[5] = eth_dev->data->port_id;
1029
1030         vring_state = rte_zmalloc_socket(name,
1031                         sizeof(*vring_state), 0, numa_node);
1032         if (vring_state == NULL)
1033                 goto error;
1034
1035         TAILQ_INIT(&eth_dev->link_intr_cbs);
1036
1037         /* now put it all together
1038          * - store queue data in internal,
1039          * - store numa_node info in ethdev data
1040          * - point eth_dev_data to internals
1041          * - and point eth_dev structure to new eth_dev_data structure
1042          */
1043         internal->dev_name = strdup(name);
1044         if (internal->dev_name == NULL)
1045                 goto error;
1046         internal->iface_name = strdup(iface_name);
1047         if (internal->iface_name == NULL)
1048                 goto error;
1049         internal->flags = flags;
1050
1051         list->eth_dev = eth_dev;
1052         pthread_mutex_lock(&internal_list_lock);
1053         TAILQ_INSERT_TAIL(&internal_list, list, next);
1054         pthread_mutex_unlock(&internal_list_lock);
1055
1056         rte_spinlock_init(&vring_state->lock);
1057         vring_states[eth_dev->data->port_id] = vring_state;
1058
1059         data->dev_private = internal;
1060         data->port_id = eth_dev->data->port_id;
1061         memmove(data->name, eth_dev->data->name, sizeof(data->name));
1062         data->nb_rx_queues = queues;
1063         data->nb_tx_queues = queues;
1064         internal->max_queues = queues;
1065         data->dev_link = pmd_link;
1066         data->mac_addrs = eth_addr;
1067
1068         /* We'll replace the 'data' originally allocated by eth_dev. So the
1069          * vhost PMD resources won't be shared between multi processes.
1070          */
1071         eth_dev->data = data;
1072         eth_dev->dev_ops = &ops;
1073         eth_dev->driver = NULL;
1074         data->dev_flags =
1075                 RTE_ETH_DEV_DETACHABLE | RTE_ETH_DEV_INTR_LSC;
1076         data->kdrv = RTE_KDRV_NONE;
1077         data->drv_name = internal->dev_name;
1078         data->numa_node = numa_node;
1079
1080         /* finally assign rx and tx ops */
1081         eth_dev->rx_pkt_burst = eth_vhost_rx;
1082         eth_dev->tx_pkt_burst = eth_vhost_tx;
1083
1084         return data->port_id;
1085
1086 error:
1087         if (internal)
1088                 free(internal->dev_name);
1089         rte_free(vring_state);
1090         rte_free(eth_addr);
1091         if (eth_dev)
1092                 rte_eth_dev_release_port(eth_dev);
1093         rte_free(internal);
1094         rte_free(list);
1095         rte_free(data);
1096
1097         return -1;
1098 }
1099
1100 static inline int
1101 open_iface(const char *key __rte_unused, const char *value, void *extra_args)
1102 {
1103         const char **iface_name = extra_args;
1104
1105         if (value == NULL)
1106                 return -1;
1107
1108         *iface_name = value;
1109
1110         return 0;
1111 }
1112
1113 static inline int
1114 open_int(const char *key __rte_unused, const char *value, void *extra_args)
1115 {
1116         uint16_t *n = extra_args;
1117
1118         if (value == NULL || extra_args == NULL)
1119                 return -EINVAL;
1120
1121         *n = (uint16_t)strtoul(value, NULL, 0);
1122         if (*n == USHRT_MAX && errno == ERANGE)
1123                 return -1;
1124
1125         return 0;
1126 }
1127
1128 static int
1129 rte_pmd_vhost_probe(const char *name, const char *params)
1130 {
1131         struct rte_kvargs *kvlist = NULL;
1132         int ret = 0;
1133         char *iface_name;
1134         uint16_t queues;
1135         uint64_t flags = 0;
1136         int client_mode = 0;
1137         int dequeue_zero_copy = 0;
1138
1139         RTE_LOG(INFO, PMD, "Initializing pmd_vhost for %s\n", name);
1140
1141         kvlist = rte_kvargs_parse(params, valid_arguments);
1142         if (kvlist == NULL)
1143                 return -1;
1144
1145         if (rte_kvargs_count(kvlist, ETH_VHOST_IFACE_ARG) == 1) {
1146                 ret = rte_kvargs_process(kvlist, ETH_VHOST_IFACE_ARG,
1147                                          &open_iface, &iface_name);
1148                 if (ret < 0)
1149                         goto out_free;
1150         } else {
1151                 ret = -1;
1152                 goto out_free;
1153         }
1154
1155         if (rte_kvargs_count(kvlist, ETH_VHOST_QUEUES_ARG) == 1) {
1156                 ret = rte_kvargs_process(kvlist, ETH_VHOST_QUEUES_ARG,
1157                                          &open_int, &queues);
1158                 if (ret < 0 || queues > RTE_MAX_QUEUES_PER_PORT)
1159                         goto out_free;
1160
1161         } else
1162                 queues = 1;
1163
1164         if (rte_kvargs_count(kvlist, ETH_VHOST_CLIENT_ARG) == 1) {
1165                 ret = rte_kvargs_process(kvlist, ETH_VHOST_CLIENT_ARG,
1166                                          &open_int, &client_mode);
1167                 if (ret < 0)
1168                         goto out_free;
1169
1170                 if (client_mode)
1171                         flags |= RTE_VHOST_USER_CLIENT;
1172         }
1173
1174         if (rte_kvargs_count(kvlist, ETH_VHOST_DEQUEUE_ZERO_COPY) == 1) {
1175                 ret = rte_kvargs_process(kvlist, ETH_VHOST_DEQUEUE_ZERO_COPY,
1176                                          &open_int, &dequeue_zero_copy);
1177                 if (ret < 0)
1178                         goto out_free;
1179
1180                 if (dequeue_zero_copy)
1181                         flags |= RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
1182         }
1183
1184         eth_dev_vhost_create(name, iface_name, queues, rte_socket_id(), flags);
1185
1186 out_free:
1187         rte_kvargs_free(kvlist);
1188         return ret;
1189 }
1190
1191 static int
1192 rte_pmd_vhost_remove(const char *name)
1193 {
1194         struct rte_eth_dev *eth_dev = NULL;
1195         struct pmd_internal *internal;
1196         struct internal_list *list;
1197         unsigned int i;
1198
1199         RTE_LOG(INFO, PMD, "Un-Initializing pmd_vhost for %s\n", name);
1200
1201         /* find an ethdev entry */
1202         eth_dev = rte_eth_dev_allocated(name);
1203         if (eth_dev == NULL)
1204                 return -ENODEV;
1205
1206         internal = eth_dev->data->dev_private;
1207         if (internal == NULL)
1208                 return -ENODEV;
1209
1210         list = find_internal_resource(internal->iface_name);
1211         if (list == NULL)
1212                 return -ENODEV;
1213
1214         pthread_mutex_lock(&internal_list_lock);
1215         TAILQ_REMOVE(&internal_list, list, next);
1216         pthread_mutex_unlock(&internal_list_lock);
1217         rte_free(list);
1218
1219         eth_dev_stop(eth_dev);
1220
1221         rte_free(vring_states[eth_dev->data->port_id]);
1222         vring_states[eth_dev->data->port_id] = NULL;
1223
1224         free(internal->dev_name);
1225         free(internal->iface_name);
1226
1227         for (i = 0; i < eth_dev->data->nb_rx_queues; i++)
1228                 rte_free(eth_dev->data->rx_queues[i]);
1229         for (i = 0; i < eth_dev->data->nb_tx_queues; i++)
1230                 rte_free(eth_dev->data->tx_queues[i]);
1231
1232         rte_free(eth_dev->data->mac_addrs);
1233         rte_free(eth_dev->data);
1234         rte_free(internal);
1235
1236         rte_eth_dev_release_port(eth_dev);
1237
1238         return 0;
1239 }
1240
1241 static struct rte_vdev_driver pmd_vhost_drv = {
1242         .probe = rte_pmd_vhost_probe,
1243         .remove = rte_pmd_vhost_remove,
1244 };
1245
1246 DRIVER_REGISTER_VDEV(net_vhost, pmd_vhost_drv);
1247 DRIVER_REGISTER_PARAM_STRING(net_vhost,
1248         "iface=<ifc> "
1249         "queues=<int>");