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
  37 #include <rte_mbuf.h>
  38 #include <rte_ethdev.h>
  39 #include <rte_ethdev_vdev.h>
  40 #include <rte_malloc.h>
  41 #include <rte_memcpy.h>
  42 #include <rte_vdev.h>
  43 #include <rte_kvargs.h>
  44 #include <rte_vhost.h>
  45 #include <rte_spinlock.h>
  46
  47 #include "rte_eth_vhost.h"
  48
  49 enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
  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 #define VHOST_MAX_PKT_BURST 32
  56
  57 static const char *valid_arguments[] = {
  58         ETH_VHOST_IFACE_ARG,
  59         ETH_VHOST_QUEUES_ARG,
  60         ETH_VHOST_CLIENT_ARG,
  61         ETH_VHOST_DEQUEUE_ZERO_COPY,
  62         NULL
  63 };
  64
  65 static struct ether_addr base_eth_addr = {
  66         .addr_bytes = {
  67                 0x56 /* V */,
  68                 0x48 /* H */,
  69                 0x4F /* O */,
  70                 0x53 /* S */,
  71                 0x54 /* T */,
  72                 0x00
  73         }
  74 };
  75
  76 enum vhost_xstats_pkts {
  77         VHOST_UNDERSIZE_PKT = 0,
  78         VHOST_64_PKT,
  79         VHOST_65_TO_127_PKT,
  80         VHOST_128_TO_255_PKT,
  81         VHOST_256_TO_511_PKT,
  82         VHOST_512_TO_1023_PKT,
  83         VHOST_1024_TO_1522_PKT,
  84         VHOST_1523_TO_MAX_PKT,
  85         VHOST_BROADCAST_PKT,
  86         VHOST_MULTICAST_PKT,
  87         VHOST_UNICAST_PKT,
  88         VHOST_ERRORS_PKT,
  89         VHOST_ERRORS_FRAGMENTED,
  90         VHOST_ERRORS_JABBER,
  91         VHOST_UNKNOWN_PROTOCOL,
  92         VHOST_XSTATS_MAX,
  93 };
  94
  95 struct vhost_stats {
  96         uint64_t pkts;
  97         uint64_t bytes;
  98         uint64_t missed_pkts;
  99         uint64_t xstats[VHOST_XSTATS_MAX];
 100 };
 101
 102 struct vhost_queue {
 103         int vid;
 104         rte_atomic32_t allow_queuing;
 105         rte_atomic32_t while_queuing;
 106         struct pmd_internal *internal;
 107         struct rte_mempool *mb_pool;
 108         uint8_t port;
 109         uint16_t virtqueue_id;
 110         struct vhost_stats stats;
 111 };
 112
 113 struct pmd_internal {
 114         rte_atomic32_t dev_attached;
 115         char *dev_name;
 116         char *iface_name;
 117         uint16_t max_queues;
 118         rte_atomic32_t started;
 119 };
 120
 121 struct internal_list {
 122         TAILQ_ENTRY(internal_list) next;
 123         struct rte_eth_dev *eth_dev;
 124 };
 125
 126 TAILQ_HEAD(internal_list_head, internal_list);
 127 static struct internal_list_head internal_list =
 128         TAILQ_HEAD_INITIALIZER(internal_list);
 129
 130 static pthread_mutex_t internal_list_lock = PTHREAD_MUTEX_INITIALIZER;
 131
 132 static struct rte_eth_link pmd_link = {
 133                 .link_speed = 10000,
 134                 .link_duplex = ETH_LINK_FULL_DUPLEX,
 135                 .link_status = ETH_LINK_DOWN
 136 };
 137
 138 struct rte_vhost_vring_state {
 139         rte_spinlock_t lock;
 140
 141         bool cur[RTE_MAX_QUEUES_PER_PORT * 2];
 142         bool seen[RTE_MAX_QUEUES_PER_PORT * 2];
 143         unsigned int index;
 144         unsigned int max_vring;
 145 };
 146
 147 static struct rte_vhost_vring_state *vring_states[RTE_MAX_ETHPORTS];
 148
 149 #define VHOST_XSTATS_NAME_SIZE 64
 150
 151 struct vhost_xstats_name_off {
 152         char name[VHOST_XSTATS_NAME_SIZE];
 153         uint64_t offset;
 154 };
 155
 156 /* [rx]_is prepended to the name string here */
 157 static const struct vhost_xstats_name_off vhost_rxport_stat_strings[] = {
 158         {"good_packets",
 159          offsetof(struct vhost_queue, stats.pkts)},
 160         {"total_bytes",
 161          offsetof(struct vhost_queue, stats.bytes)},
 162         {"missed_pkts",
 163          offsetof(struct vhost_queue, stats.missed_pkts)},
 164         {"broadcast_packets",
 165          offsetof(struct vhost_queue, stats.xstats[VHOST_BROADCAST_PKT])},
 166         {"multicast_packets",
 167          offsetof(struct vhost_queue, stats.xstats[VHOST_MULTICAST_PKT])},
 168         {"unicast_packets",
 169          offsetof(struct vhost_queue, stats.xstats[VHOST_UNICAST_PKT])},
 170          {"undersize_packets",
 171          offsetof(struct vhost_queue, stats.xstats[VHOST_UNDERSIZE_PKT])},
 172         {"size_64_packets",
 173          offsetof(struct vhost_queue, stats.xstats[VHOST_64_PKT])},
 174         {"size_65_to_127_packets",
 175          offsetof(struct vhost_queue, stats.xstats[VHOST_65_TO_127_PKT])},
 176         {"size_128_to_255_packets",
 177          offsetof(struct vhost_queue, stats.xstats[VHOST_128_TO_255_PKT])},
 178         {"size_256_to_511_packets",
 179          offsetof(struct vhost_queue, stats.xstats[VHOST_256_TO_511_PKT])},
 180         {"size_512_to_1023_packets",
 181          offsetof(struct vhost_queue, stats.xstats[VHOST_512_TO_1023_PKT])},
 182         {"size_1024_to_1522_packets",
 183          offsetof(struct vhost_queue, stats.xstats[VHOST_1024_TO_1522_PKT])},
 184         {"size_1523_to_max_packets",
 185          offsetof(struct vhost_queue, stats.xstats[VHOST_1523_TO_MAX_PKT])},
 186         {"errors_with_bad_CRC",
 187          offsetof(struct vhost_queue, stats.xstats[VHOST_ERRORS_PKT])},
 188         {"fragmented_errors",
 189          offsetof(struct vhost_queue, stats.xstats[VHOST_ERRORS_FRAGMENTED])},
 190         {"jabber_errors",
 191          offsetof(struct vhost_queue, stats.xstats[VHOST_ERRORS_JABBER])},
 192         {"unknown_protos_packets",
 193          offsetof(struct vhost_queue, stats.xstats[VHOST_UNKNOWN_PROTOCOL])},
 194 };
 195
 196 /* [tx]_ is prepended to the name string here */
 197 static const struct vhost_xstats_name_off vhost_txport_stat_strings[] = {
 198         {"good_packets",
 199          offsetof(struct vhost_queue, stats.pkts)},
 200         {"total_bytes",
 201          offsetof(struct vhost_queue, stats.bytes)},
 202         {"missed_pkts",
 203          offsetof(struct vhost_queue, stats.missed_pkts)},
 204         {"broadcast_packets",
 205          offsetof(struct vhost_queue, stats.xstats[VHOST_BROADCAST_PKT])},
 206         {"multicast_packets",
 207          offsetof(struct vhost_queue, stats.xstats[VHOST_MULTICAST_PKT])},
 208         {"unicast_packets",
 209          offsetof(struct vhost_queue, stats.xstats[VHOST_UNICAST_PKT])},
 210         {"undersize_packets",
 211          offsetof(struct vhost_queue, stats.xstats[VHOST_UNDERSIZE_PKT])},
 212         {"size_64_packets",
 213          offsetof(struct vhost_queue, stats.xstats[VHOST_64_PKT])},
 214         {"size_65_to_127_packets",
 215          offsetof(struct vhost_queue, stats.xstats[VHOST_65_TO_127_PKT])},
 216         {"size_128_to_255_packets",
 217          offsetof(struct vhost_queue, stats.xstats[VHOST_128_TO_255_PKT])},
 218         {"size_256_to_511_packets",
 219          offsetof(struct vhost_queue, stats.xstats[VHOST_256_TO_511_PKT])},
 220         {"size_512_to_1023_packets",
 221          offsetof(struct vhost_queue, stats.xstats[VHOST_512_TO_1023_PKT])},
 222         {"size_1024_to_1522_packets",
 223          offsetof(struct vhost_queue, stats.xstats[VHOST_1024_TO_1522_PKT])},
 224         {"size_1523_to_max_packets",
 225          offsetof(struct vhost_queue, stats.xstats[VHOST_1523_TO_MAX_PKT])},
 226         {"errors_with_bad_CRC",
 227          offsetof(struct vhost_queue, stats.xstats[VHOST_ERRORS_PKT])},
 228 };
 229
 230 #define VHOST_NB_XSTATS_RXPORT (sizeof(vhost_rxport_stat_strings) / \
 231                                 sizeof(vhost_rxport_stat_strings[0]))
 232
 233 #define VHOST_NB_XSTATS_TXPORT (sizeof(vhost_txport_stat_strings) / \
 234                                 sizeof(vhost_txport_stat_strings[0]))
 235
 236 static void
 237 vhost_dev_xstats_reset(struct rte_eth_dev *dev)
 238 {
 239         struct vhost_queue *vq = NULL;
 240         unsigned int i = 0;
 241
 242         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 243                 vq = dev->data->rx_queues[i];
 244                 if (!vq)
 245                         continue;
 246                 memset(&vq->stats, 0, sizeof(vq->stats));
 247         }
 248         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 249                 vq = dev->data->tx_queues[i];
 250                 if (!vq)
 251                         continue;
 252                 memset(&vq->stats, 0, sizeof(vq->stats));
 253         }
 254 }
 255
 256 static int
 257 vhost_dev_xstats_get_names(struct rte_eth_dev *dev __rte_unused,
 258                            struct rte_eth_xstat_name *xstats_names,
 259                            unsigned int limit __rte_unused)
 260 {
 261         unsigned int t = 0;
 262         int count = 0;
 263         int nstats = VHOST_NB_XSTATS_RXPORT + VHOST_NB_XSTATS_TXPORT;
 264
 265         if (!xstats_names)
 266                 return nstats;
 267         for (t = 0; t < VHOST_NB_XSTATS_RXPORT; t++) {
 268                 snprintf(xstats_names[count].name,
 269                          sizeof(xstats_names[count].name),
 270                          "rx_%s", vhost_rxport_stat_strings[t].name);
 271                 count++;
 272         }
 273         for (t = 0; t < VHOST_NB_XSTATS_TXPORT; t++) {
 274                 snprintf(xstats_names[count].name,
 275                          sizeof(xstats_names[count].name),
 276                          "tx_%s", vhost_txport_stat_strings[t].name);
 277                 count++;
 278         }
 279         return count;
 280 }
 281
 282 static int
 283 vhost_dev_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
 284                      unsigned int n)
 285 {
 286         unsigned int i;
 287         unsigned int t;
 288         unsigned int count = 0;
 289         struct vhost_queue *vq = NULL;
 290         unsigned int nxstats = VHOST_NB_XSTATS_RXPORT + VHOST_NB_XSTATS_TXPORT;
 291
 292         if (n < nxstats)
 293                 return nxstats;
 294
 295         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 296                 vq = dev->data->rx_queues[i];
 297                 if (!vq)
 298                         continue;
 299                 vq->stats.xstats[VHOST_UNICAST_PKT] = vq->stats.pkts
 300                                 - (vq->stats.xstats[VHOST_BROADCAST_PKT]
 301                                 + vq->stats.xstats[VHOST_MULTICAST_PKT]);
 302         }
 303         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 304                 vq = dev->data->tx_queues[i];
 305                 if (!vq)
 306                         continue;
 307                 vq->stats.xstats[VHOST_UNICAST_PKT] = vq->stats.pkts
 308                                 + vq->stats.missed_pkts
 309                                 - (vq->stats.xstats[VHOST_BROADCAST_PKT]
 310                                 + vq->stats.xstats[VHOST_MULTICAST_PKT]);
 311         }
 312         for (t = 0; t < VHOST_NB_XSTATS_RXPORT; t++) {
 313                 xstats[count].value = 0;
 314                 for (i = 0; i < dev->data->nb_rx_queues; i++) {
 315                         vq = dev->data->rx_queues[i];
 316                         if (!vq)
 317                                 continue;
 318                         xstats[count].value +=
 319                                 *(uint64_t *)(((char *)vq)
 320                                 + vhost_rxport_stat_strings[t].offset);
 321                 }
 322                 xstats[count].id = count;
 323                 count++;
 324         }
 325         for (t = 0; t < VHOST_NB_XSTATS_TXPORT; t++) {
 326                 xstats[count].value = 0;
 327                 for (i = 0; i < dev->data->nb_tx_queues; i++) {
 328                         vq = dev->data->tx_queues[i];
 329                         if (!vq)
 330                                 continue;
 331                         xstats[count].value +=
 332                                 *(uint64_t *)(((char *)vq)
 333                                 + vhost_txport_stat_strings[t].offset);
 334                 }
 335                 xstats[count].id = count;
 336                 count++;
 337         }
 338         return count;
 339 }
 340
 341 static inline void
 342 vhost_count_multicast_broadcast(struct vhost_queue *vq,
 343                                 struct rte_mbuf *mbuf)
 344 {
 345         struct ether_addr *ea = NULL;
 346         struct vhost_stats *pstats = &vq->stats;
 347
 348         ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
 349         if (is_multicast_ether_addr(ea)) {
 350                 if (is_broadcast_ether_addr(ea))
 351                         pstats->xstats[VHOST_BROADCAST_PKT]++;
 352                 else
 353                         pstats->xstats[VHOST_MULTICAST_PKT]++;
 354         }
 355 }
 356
 357 static void
 358 vhost_update_packet_xstats(struct vhost_queue *vq,
 359                            struct rte_mbuf **bufs,
 360                            uint16_t count)
 361 {
 362         uint32_t pkt_len = 0;
 363         uint64_t i = 0;
 364         uint64_t index;
 365         struct vhost_stats *pstats = &vq->stats;
 366
 367         for (i = 0; i < count ; i++) {
 368                 pkt_len = bufs[i]->pkt_len;
 369                 if (pkt_len == 64) {
 370                         pstats->xstats[VHOST_64_PKT]++;
 371                 } else if (pkt_len > 64 && pkt_len < 1024) {
 372                         index = (sizeof(pkt_len) * 8)
 373                                 - __builtin_clz(pkt_len) - 5;
 374                         pstats->xstats[index]++;
 375                 } else {
 376                         if (pkt_len < 64)
 377                                 pstats->xstats[VHOST_UNDERSIZE_PKT]++;
 378                         else if (pkt_len <= 1522)
 379                                 pstats->xstats[VHOST_1024_TO_1522_PKT]++;
 380                         else if (pkt_len > 1522)
 381                                 pstats->xstats[VHOST_1523_TO_MAX_PKT]++;
 382                 }
 383                 vhost_count_multicast_broadcast(vq, bufs[i]);
 384         }
 385 }
 386
 387 static uint16_t
 388 eth_vhost_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
 389 {
 390         struct vhost_queue *r = q;
 391         uint16_t i, nb_rx = 0;
 392         uint16_t nb_receive = nb_bufs;
 393
 394         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 395                 return 0;
 396
 397         rte_atomic32_set(&r->while_queuing, 1);
 398
 399         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 400                 goto out;
 401
 402         /* Dequeue packets from guest TX queue */
 403         while (nb_receive) {
 404                 uint16_t nb_pkts;
 405                 uint16_t num = (uint16_t)RTE_MIN(nb_receive,
 406                                                  VHOST_MAX_PKT_BURST);
 407
 408                 nb_pkts = rte_vhost_dequeue_burst(r->vid, r->virtqueue_id,
 409                                                   r->mb_pool, &bufs[nb_rx],
 410                                                   num);
 411
 412                 nb_rx += nb_pkts;
 413                 nb_receive -= nb_pkts;
 414                 if (nb_pkts < num)
 415                         break;
 416         }
 417
 418         r->stats.pkts += nb_rx;
 419
 420         for (i = 0; likely(i < nb_rx); i++) {
 421                 bufs[i]->port = r->port;
 422                 r->stats.bytes += bufs[i]->pkt_len;
 423         }
 424
 425         vhost_update_packet_xstats(r, bufs, nb_rx);
 426
 427 out:
 428         rte_atomic32_set(&r->while_queuing, 0);
 429
 430         return nb_rx;
 431 }
 432
 433 static uint16_t
 434 eth_vhost_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
 435 {
 436         struct vhost_queue *r = q;
 437         uint16_t i, nb_tx = 0;
 438         uint16_t nb_send = nb_bufs;
 439
 440         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 441                 return 0;
 442
 443         rte_atomic32_set(&r->while_queuing, 1);
 444
 445         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 446                 goto out;
 447
 448         /* Enqueue packets to guest RX queue */
 449         while (nb_send) {
 450                 uint16_t nb_pkts;
 451                 uint16_t num = (uint16_t)RTE_MIN(nb_send,
 452                                                  VHOST_MAX_PKT_BURST);
 453
 454                 nb_pkts = rte_vhost_enqueue_burst(r->vid, r->virtqueue_id,
 455                                                   &bufs[nb_tx], num);
 456
 457                 nb_tx += nb_pkts;
 458                 nb_send -= nb_pkts;
 459                 if (nb_pkts < num)
 460                         break;
 461         }
 462
 463         r->stats.pkts += nb_tx;
 464         r->stats.missed_pkts += nb_bufs - nb_tx;
 465
 466         for (i = 0; likely(i < nb_tx); i++)
 467                 r->stats.bytes += bufs[i]->pkt_len;
 468
 469         vhost_update_packet_xstats(r, bufs, nb_tx);
 470
 471         /* According to RFC2863 page42 section ifHCOutMulticastPkts and
 472          * ifHCOutBroadcastPkts, the counters "multicast" and "broadcast"
 473          * are increased when packets are not transmitted successfully.
 474          */
 475         for (i = nb_tx; i < nb_bufs; i++)
 476                 vhost_count_multicast_broadcast(r, bufs[i]);
 477
 478         for (i = 0; likely(i < nb_tx); i++)
 479                 rte_pktmbuf_free(bufs[i]);
 480 out:
 481         rte_atomic32_set(&r->while_queuing, 0);
 482
 483         return nb_tx;
 484 }
 485
 486 static int
 487 eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
 488 {
 489         return 0;
 490 }
 491
 492 static inline struct internal_list *
 493 find_internal_resource(char *ifname)
 494 {
 495         int found = 0;
 496         struct internal_list *list;
 497         struct pmd_internal *internal;
 498
 499         if (ifname == NULL)
 500                 return NULL;
 501
 502         pthread_mutex_lock(&internal_list_lock);
 503
 504         TAILQ_FOREACH(list, &internal_list, next) {
 505                 internal = list->eth_dev->data->dev_private;
 506                 if (!strcmp(internal->iface_name, ifname)) {
 507                         found = 1;
 508                         break;
 509                 }
 510         }
 511
 512         pthread_mutex_unlock(&internal_list_lock);
 513
 514         if (!found)
 515                 return NULL;
 516
 517         return list;
 518 }
 519
 520 static void
 521 update_queuing_status(struct rte_eth_dev *dev)
 522 {
 523         struct pmd_internal *internal = dev->data->dev_private;
 524         struct vhost_queue *vq;
 525         unsigned int i;
 526         int allow_queuing = 1;
 527
 528         if (rte_atomic32_read(&internal->started) == 0 ||
 529             rte_atomic32_read(&internal->dev_attached) == 0)
 530                 allow_queuing = 0;
 531
 532         /* Wait until rx/tx_pkt_burst stops accessing vhost device */
 533         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 534                 vq = dev->data->rx_queues[i];
 535                 if (vq == NULL)
 536                         continue;
 537                 rte_atomic32_set(&vq->allow_queuing, allow_queuing);
 538                 while (rte_atomic32_read(&vq->while_queuing))
 539                         rte_pause();
 540         }
 541
 542         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 543                 vq = dev->data->tx_queues[i];
 544                 if (vq == NULL)
 545                         continue;
 546                 rte_atomic32_set(&vq->allow_queuing, allow_queuing);
 547                 while (rte_atomic32_read(&vq->while_queuing))
 548                         rte_pause();
 549         }
 550 }
 551
 552 static int
 553 new_device(int vid)
 554 {
 555         struct rte_eth_dev *eth_dev;
 556         struct internal_list *list;
 557         struct pmd_internal *internal;
 558         struct vhost_queue *vq;
 559         unsigned i;
 560         char ifname[PATH_MAX];
 561 #ifdef RTE_LIBRTE_VHOST_NUMA
 562         int newnode;
 563 #endif
 564
 565         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 566         list = find_internal_resource(ifname);
 567         if (list == NULL) {
 568                 RTE_LOG(INFO, PMD, "Invalid device name: %s\n", ifname);
 569                 return -1;
 570         }
 571
 572         eth_dev = list->eth_dev;
 573         internal = eth_dev->data->dev_private;
 574
 575 #ifdef RTE_LIBRTE_VHOST_NUMA
 576         newnode = rte_vhost_get_numa_node(vid);
 577         if (newnode >= 0)
 578                 eth_dev->data->numa_node = newnode;
 579 #endif
 580
 581         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 582                 vq = eth_dev->data->rx_queues[i];
 583                 if (vq == NULL)
 584                         continue;
 585                 vq->vid = vid;
 586                 vq->internal = internal;
 587                 vq->port = eth_dev->data->port_id;
 588         }
 589         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 590                 vq = eth_dev->data->tx_queues[i];
 591                 if (vq == NULL)
 592                         continue;
 593                 vq->vid = vid;
 594                 vq->internal = internal;
 595                 vq->port = eth_dev->data->port_id;
 596         }
 597
 598         for (i = 0; i < rte_vhost_get_vring_num(vid); i++)
 599                 rte_vhost_enable_guest_notification(vid, i, 0);
 600
 601         rte_vhost_get_mtu(vid, &eth_dev->data->mtu);
 602
 603         eth_dev->data->dev_link.link_status = ETH_LINK_UP;
 604
 605         rte_atomic32_set(&internal->dev_attached, 1);
 606         update_queuing_status(eth_dev);
 607
 608         RTE_LOG(INFO, PMD, "New connection established\n");
 609
 610         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC,
 611                                       NULL, NULL);
 612
 613         return 0;
 614 }
 615
 616 static void
 617 destroy_device(int vid)
 618 {
 619         struct rte_eth_dev *eth_dev;
 620         struct pmd_internal *internal;
 621         struct vhost_queue *vq;
 622         struct internal_list *list;
 623         char ifname[PATH_MAX];
 624         unsigned i;
 625         struct rte_vhost_vring_state *state;
 626
 627         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 628         list = find_internal_resource(ifname);
 629         if (list == NULL) {
 630                 RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname);
 631                 return;
 632         }
 633         eth_dev = list->eth_dev;
 634         internal = eth_dev->data->dev_private;
 635
 636         rte_atomic32_set(&internal->dev_attached, 0);
 637         update_queuing_status(eth_dev);
 638
 639         eth_dev->data->dev_link.link_status = ETH_LINK_DOWN;
 640
 641         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 642                 vq = eth_dev->data->rx_queues[i];
 643                 if (vq == NULL)
 644                         continue;
 645                 vq->vid = -1;
 646         }
 647         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 648                 vq = eth_dev->data->tx_queues[i];
 649                 if (vq == NULL)
 650                         continue;
 651                 vq->vid = -1;
 652         }
 653
 654         state = vring_states[eth_dev->data->port_id];
 655         rte_spinlock_lock(&state->lock);
 656         for (i = 0; i <= state->max_vring; i++) {
 657                 state->cur[i] = false;
 658                 state->seen[i] = false;
 659         }
 660         state->max_vring = 0;
 661         rte_spinlock_unlock(&state->lock);
 662
 663         RTE_LOG(INFO, PMD, "Connection closed\n");
 664
 665         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC,
 666                                       NULL, NULL);
 667 }
 668
 669 static int
 670 vring_state_changed(int vid, uint16_t vring, int enable)
 671 {
 672         struct rte_vhost_vring_state *state;
 673         struct rte_eth_dev *eth_dev;
 674         struct internal_list *list;
 675         char ifname[PATH_MAX];
 676
 677         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 678         list = find_internal_resource(ifname);
 679         if (list == NULL) {
 680                 RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname);
 681                 return -1;
 682         }
 683
 684         eth_dev = list->eth_dev;
 685         /* won't be NULL */
 686         state = vring_states[eth_dev->data->port_id];
 687         rte_spinlock_lock(&state->lock);
 688         state->cur[vring] = enable;
 689         state->max_vring = RTE_MAX(vring, state->max_vring);
 690         rte_spinlock_unlock(&state->lock);
 691
 692         RTE_LOG(INFO, PMD, "vring%u is %s\n",
 693                         vring, enable ? "enabled" : "disabled");
 694
 695         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_QUEUE_STATE,
 696                                       NULL, NULL);
 697
 698         return 0;
 699 }
 700
 701 static struct vhost_device_ops vhost_ops = {
 702         .new_device          = new_device,
 703         .destroy_device      = destroy_device,
 704         .vring_state_changed = vring_state_changed,
 705 };
 706
 707 int
 708 rte_eth_vhost_get_queue_event(uint8_t port_id,
 709                 struct rte_eth_vhost_queue_event *event)
 710 {
 711         struct rte_vhost_vring_state *state;
 712         unsigned int i;
 713         int idx;
 714
 715         if (port_id >= RTE_MAX_ETHPORTS) {
 716                 RTE_LOG(ERR, PMD, "Invalid port id\n");
 717                 return -1;
 718         }
 719
 720         state = vring_states[port_id];
 721         if (!state) {
 722                 RTE_LOG(ERR, PMD, "Unused port\n");
 723                 return -1;
 724         }
 725
 726         rte_spinlock_lock(&state->lock);
 727         for (i = 0; i <= state->max_vring; i++) {
 728                 idx = state->index++ % (state->max_vring + 1);
 729
 730                 if (state->cur[idx] != state->seen[idx]) {
 731                         state->seen[idx] = state->cur[idx];
 732                         event->queue_id = idx / 2;
 733                         event->rx = idx & 1;
 734                         event->enable = state->cur[idx];
 735                         rte_spinlock_unlock(&state->lock);
 736                         return 0;
 737                 }
 738         }
 739         rte_spinlock_unlock(&state->lock);
 740
 741         return -1;
 742 }
 743
 744 int
 745 rte_eth_vhost_get_vid_from_port_id(uint8_t port_id)
 746 {
 747         struct internal_list *list;
 748         struct rte_eth_dev *eth_dev;
 749         struct vhost_queue *vq;
 750         int vid = -1;
 751
 752         if (!rte_eth_dev_is_valid_port(port_id))
 753                 return -1;
 754
 755         pthread_mutex_lock(&internal_list_lock);
 756
 757         TAILQ_FOREACH(list, &internal_list, next) {
 758                 eth_dev = list->eth_dev;
 759                 if (eth_dev->data->port_id == port_id) {
 760                         vq = eth_dev->data->rx_queues[0];
 761                         if (vq) {
 762                                 vid = vq->vid;
 763                         }
 764                         break;
 765                 }
 766         }
 767
 768         pthread_mutex_unlock(&internal_list_lock);
 769
 770         return vid;
 771 }
 772
 773 static int
 774 eth_dev_start(struct rte_eth_dev *dev)
 775 {
 776         struct pmd_internal *internal = dev->data->dev_private;
 777
 778         rte_atomic32_set(&internal->started, 1);
 779         update_queuing_status(dev);
 780
 781         return 0;
 782 }
 783
 784 static void
 785 eth_dev_stop(struct rte_eth_dev *dev)
 786 {
 787         struct pmd_internal *internal = dev->data->dev_private;
 788
 789         rte_atomic32_set(&internal->started, 0);
 790         update_queuing_status(dev);
 791 }
 792
 793 static void
 794 eth_dev_close(struct rte_eth_dev *dev)
 795 {
 796         struct pmd_internal *internal;
 797         struct internal_list *list;
 798         unsigned int i;
 799
 800         internal = dev->data->dev_private;
 801         if (!internal)
 802                 return;
 803
 804         eth_dev_stop(dev);
 805
 806         rte_vhost_driver_unregister(internal->iface_name);
 807
 808         list = find_internal_resource(internal->iface_name);
 809         if (!list)
 810                 return;
 811
 812         pthread_mutex_lock(&internal_list_lock);
 813         TAILQ_REMOVE(&internal_list, list, next);
 814         pthread_mutex_unlock(&internal_list_lock);
 815         rte_free(list);
 816
 817         for (i = 0; i < dev->data->nb_rx_queues; i++)
 818                 rte_free(dev->data->rx_queues[i]);
 819         for (i = 0; i < dev->data->nb_tx_queues; i++)
 820                 rte_free(dev->data->tx_queues[i]);
 821
 822         rte_free(dev->data->mac_addrs);
 823         free(internal->dev_name);
 824         free(internal->iface_name);
 825         rte_free(internal);
 826
 827         dev->data->dev_private = NULL;
 828 }
 829
 830 static int
 831 eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 832                    uint16_t nb_rx_desc __rte_unused,
 833                    unsigned int socket_id,
 834                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 835                    struct rte_mempool *mb_pool)
 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 rx queue\n");
 843                 return -ENOMEM;
 844         }
 845
 846         vq->mb_pool = mb_pool;
 847         vq->virtqueue_id = rx_queue_id * VIRTIO_QNUM + VIRTIO_TXQ;
 848         dev->data->rx_queues[rx_queue_id] = vq;
 849
 850         return 0;
 851 }
 852
 853 static int
 854 eth_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 855                    uint16_t nb_tx_desc __rte_unused,
 856                    unsigned int socket_id,
 857                    const struct rte_eth_txconf *tx_conf __rte_unused)
 858 {
 859         struct vhost_queue *vq;
 860
 861         vq = rte_zmalloc_socket(NULL, sizeof(struct vhost_queue),
 862                         RTE_CACHE_LINE_SIZE, socket_id);
 863         if (vq == NULL) {
 864                 RTE_LOG(ERR, PMD, "Failed to allocate memory for tx queue\n");
 865                 return -ENOMEM;
 866         }
 867
 868         vq->virtqueue_id = tx_queue_id * VIRTIO_QNUM + VIRTIO_RXQ;
 869         dev->data->tx_queues[tx_queue_id] = vq;
 870
 871         return 0;
 872 }
 873
 874 static void
 875 eth_dev_info(struct rte_eth_dev *dev,
 876              struct rte_eth_dev_info *dev_info)
 877 {
 878         struct pmd_internal *internal;
 879
 880         internal = dev->data->dev_private;
 881         if (internal == NULL) {
 882                 RTE_LOG(ERR, PMD, "Invalid device specified\n");
 883                 return;
 884         }
 885
 886         dev_info->max_mac_addrs = 1;
 887         dev_info->max_rx_pktlen = (uint32_t)-1;
 888         dev_info->max_rx_queues = internal->max_queues;
 889         dev_info->max_tx_queues = internal->max_queues;
 890         dev_info->min_rx_bufsize = 0;
 891 }
 892
 893 static void
 894 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 895 {
 896         unsigned i;
 897         unsigned long rx_total = 0, tx_total = 0, tx_missed_total = 0;
 898         unsigned long rx_total_bytes = 0, tx_total_bytes = 0;
 899         struct vhost_queue *vq;
 900
 901         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 902                         i < dev->data->nb_rx_queues; i++) {
 903                 if (dev->data->rx_queues[i] == NULL)
 904                         continue;
 905                 vq = dev->data->rx_queues[i];
 906                 stats->q_ipackets[i] = vq->stats.pkts;
 907                 rx_total += stats->q_ipackets[i];
 908
 909                 stats->q_ibytes[i] = vq->stats.bytes;
 910                 rx_total_bytes += stats->q_ibytes[i];
 911         }
 912
 913         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 914                         i < dev->data->nb_tx_queues; i++) {
 915                 if (dev->data->tx_queues[i] == NULL)
 916                         continue;
 917                 vq = dev->data->tx_queues[i];
 918                 stats->q_opackets[i] = vq->stats.pkts;
 919                 tx_missed_total += vq->stats.missed_pkts;
 920                 tx_total += stats->q_opackets[i];
 921
 922                 stats->q_obytes[i] = vq->stats.bytes;
 923                 tx_total_bytes += stats->q_obytes[i];
 924         }
 925
 926         stats->ipackets = rx_total;
 927         stats->opackets = tx_total;
 928         stats->oerrors = tx_missed_total;
 929         stats->ibytes = rx_total_bytes;
 930         stats->obytes = tx_total_bytes;
 931 }
 932
 933 static void
 934 eth_stats_reset(struct rte_eth_dev *dev)
 935 {
 936         struct vhost_queue *vq;
 937         unsigned i;
 938
 939         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 940                 if (dev->data->rx_queues[i] == NULL)
 941                         continue;
 942                 vq = dev->data->rx_queues[i];
 943                 vq->stats.pkts = 0;
 944                 vq->stats.bytes = 0;
 945         }
 946         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 947                 if (dev->data->tx_queues[i] == NULL)
 948                         continue;
 949                 vq = dev->data->tx_queues[i];
 950                 vq->stats.pkts = 0;
 951                 vq->stats.bytes = 0;
 952                 vq->stats.missed_pkts = 0;
 953         }
 954 }
 955
 956 static void
 957 eth_queue_release(void *q)
 958 {
 959         rte_free(q);
 960 }
 961
 962 static int
 963 eth_tx_done_cleanup(void *txq __rte_unused, uint32_t free_cnt __rte_unused)
 964 {
 965         /*
 966          * vHost does not hang onto mbuf. eth_vhost_tx() copies packet data
 967          * and releases mbuf, so nothing to cleanup.
 968          */
 969         return 0;
 970 }
 971
 972 static int
 973 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 974                 int wait_to_complete __rte_unused)
 975 {
 976         return 0;
 977 }
 978
 979 static uint32_t
 980 eth_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 981 {
 982         struct vhost_queue *vq;
 983
 984         vq = dev->data->rx_queues[rx_queue_id];
 985         if (vq == NULL)
 986                 return 0;
 987
 988         return rte_vhost_rx_queue_count(vq->vid, vq->virtqueue_id);
 989 }
 990
 991 static const struct eth_dev_ops ops = {
 992         .dev_start = eth_dev_start,
 993         .dev_stop = eth_dev_stop,
 994         .dev_close = eth_dev_close,
 995         .dev_configure = eth_dev_configure,
 996         .dev_infos_get = eth_dev_info,
 997         .rx_queue_setup = eth_rx_queue_setup,
 998         .tx_queue_setup = eth_tx_queue_setup,
 999         .rx_queue_release = eth_queue_release,
1000         .tx_queue_release = eth_queue_release,
1001         .tx_done_cleanup = eth_tx_done_cleanup,
1002         .rx_queue_count = eth_rx_queue_count,
1003         .link_update = eth_link_update,
1004         .stats_get = eth_stats_get,
1005         .stats_reset = eth_stats_reset,
1006         .xstats_reset = vhost_dev_xstats_reset,
1007         .xstats_get = vhost_dev_xstats_get,
1008         .xstats_get_names = vhost_dev_xstats_get_names,
1009 };
1010
1011 static struct rte_vdev_driver pmd_vhost_drv;
1012
1013 static int
1014 eth_dev_vhost_create(struct rte_vdev_device *dev, char *iface_name,
1015         int16_t queues, const unsigned int numa_node, uint64_t flags)
1016 {
1017         const char *name = rte_vdev_device_name(dev);
1018         struct rte_eth_dev_data *data = NULL;
1019         struct pmd_internal *internal = NULL;
1020         struct rte_eth_dev *eth_dev = NULL;
1021         struct ether_addr *eth_addr = NULL;
1022         struct rte_vhost_vring_state *vring_state = NULL;
1023         struct internal_list *list = NULL;
1024
1025         RTE_LOG(INFO, PMD, "Creating VHOST-USER backend on numa socket %u\n",
1026                 numa_node);
1027
1028         /* now do all data allocation - for eth_dev structure and internal
1029          * (private) data
1030          */
1031         data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
1032         if (data == NULL)
1033                 goto error;
1034
1035         list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
1036         if (list == NULL)
1037                 goto error;
1038
1039         /* reserve an ethdev entry */
1040         eth_dev = rte_eth_vdev_allocate(dev, sizeof(*internal));
1041         if (eth_dev == NULL)
1042                 goto error;
1043
1044         eth_addr = rte_zmalloc_socket(name, sizeof(*eth_addr), 0, numa_node);
1045         if (eth_addr == NULL)
1046                 goto error;
1047         *eth_addr = base_eth_addr;
1048         eth_addr->addr_bytes[5] = eth_dev->data->port_id;
1049
1050         vring_state = rte_zmalloc_socket(name,
1051                         sizeof(*vring_state), 0, numa_node);
1052         if (vring_state == NULL)
1053                 goto error;
1054
1055         /* now put it all together
1056          * - store queue data in internal,
1057          * - point eth_dev_data to internals
1058          * - and point eth_dev structure to new eth_dev_data structure
1059          */
1060         internal = eth_dev->data->dev_private;
1061         internal->dev_name = strdup(name);
1062         if (internal->dev_name == NULL)
1063                 goto error;
1064         internal->iface_name = strdup(iface_name);
1065         if (internal->iface_name == NULL)
1066                 goto error;
1067
1068         list->eth_dev = eth_dev;
1069         pthread_mutex_lock(&internal_list_lock);
1070         TAILQ_INSERT_TAIL(&internal_list, list, next);
1071         pthread_mutex_unlock(&internal_list_lock);
1072
1073         rte_spinlock_init(&vring_state->lock);
1074         vring_states[eth_dev->data->port_id] = vring_state;
1075
1076         /* We'll replace the 'data' originally allocated by eth_dev. So the
1077          * vhost PMD resources won't be shared between multi processes.
1078          */
1079         rte_memcpy(data, eth_dev->data, sizeof(*data));
1080         eth_dev->data = data;
1081
1082         data->nb_rx_queues = queues;
1083         data->nb_tx_queues = queues;
1084         internal->max_queues = queues;
1085         data->dev_link = pmd_link;
1086         data->mac_addrs = eth_addr;
1087         data->dev_flags =
1088                 RTE_ETH_DEV_DETACHABLE | RTE_ETH_DEV_INTR_LSC;
1089
1090         eth_dev->dev_ops = &ops;
1091
1092         /* finally assign rx and tx ops */
1093         eth_dev->rx_pkt_burst = eth_vhost_rx;
1094         eth_dev->tx_pkt_burst = eth_vhost_tx;
1095
1096         if (rte_vhost_driver_register(iface_name, flags))
1097                 goto error;
1098
1099         if (rte_vhost_driver_callback_register(iface_name, &vhost_ops) < 0) {
1100                 RTE_LOG(ERR, PMD, "Can't register callbacks\n");
1101                 goto error;
1102         }
1103
1104         if (rte_vhost_driver_start(iface_name) < 0) {
1105                 RTE_LOG(ERR, PMD, "Failed to start driver for %s\n",
1106                         iface_name);
1107                 goto error;
1108         }
1109
1110         return data->port_id;
1111
1112 error:
1113         if (internal) {
1114                 free(internal->iface_name);
1115                 free(internal->dev_name);
1116         }
1117         rte_free(vring_state);
1118         rte_free(eth_addr);
1119         if (eth_dev)
1120                 rte_eth_dev_release_port(eth_dev);
1121         rte_free(internal);
1122         rte_free(list);
1123         rte_free(data);
1124
1125         return -1;
1126 }
1127
1128 static inline int
1129 open_iface(const char *key __rte_unused, const char *value, void *extra_args)
1130 {
1131         const char **iface_name = extra_args;
1132
1133         if (value == NULL)
1134                 return -1;
1135
1136         *iface_name = value;
1137
1138         return 0;
1139 }
1140
1141 static inline int
1142 open_int(const char *key __rte_unused, const char *value, void *extra_args)
1143 {
1144         uint16_t *n = extra_args;
1145
1146         if (value == NULL || extra_args == NULL)
1147                 return -EINVAL;
1148
1149         *n = (uint16_t)strtoul(value, NULL, 0);
1150         if (*n == USHRT_MAX && errno == ERANGE)
1151                 return -1;
1152
1153         return 0;
1154 }
1155
1156 static int
1157 rte_pmd_vhost_probe(struct rte_vdev_device *dev)
1158 {
1159         struct rte_kvargs *kvlist = NULL;
1160         int ret = 0;
1161         char *iface_name;
1162         uint16_t queues;
1163         uint64_t flags = 0;
1164         int client_mode = 0;
1165         int dequeue_zero_copy = 0;
1166
1167         RTE_LOG(INFO, PMD, "Initializing pmd_vhost for %s\n",
1168                 rte_vdev_device_name(dev));
1169
1170         kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_arguments);
1171         if (kvlist == NULL)
1172                 return -1;
1173
1174         if (rte_kvargs_count(kvlist, ETH_VHOST_IFACE_ARG) == 1) {
1175                 ret = rte_kvargs_process(kvlist, ETH_VHOST_IFACE_ARG,
1176                                          &open_iface, &iface_name);
1177                 if (ret < 0)
1178                         goto out_free;
1179         } else {
1180                 ret = -1;
1181                 goto out_free;
1182         }
1183
1184         if (rte_kvargs_count(kvlist, ETH_VHOST_QUEUES_ARG) == 1) {
1185                 ret = rte_kvargs_process(kvlist, ETH_VHOST_QUEUES_ARG,
1186                                          &open_int, &queues);
1187                 if (ret < 0 || queues > RTE_MAX_QUEUES_PER_PORT)
1188                         goto out_free;
1189
1190         } else
1191                 queues = 1;
1192
1193         if (rte_kvargs_count(kvlist, ETH_VHOST_CLIENT_ARG) == 1) {
1194                 ret = rte_kvargs_process(kvlist, ETH_VHOST_CLIENT_ARG,
1195                                          &open_int, &client_mode);
1196                 if (ret < 0)
1197                         goto out_free;
1198
1199                 if (client_mode)
1200                         flags |= RTE_VHOST_USER_CLIENT;
1201         }
1202
1203         if (rte_kvargs_count(kvlist, ETH_VHOST_DEQUEUE_ZERO_COPY) == 1) {
1204                 ret = rte_kvargs_process(kvlist, ETH_VHOST_DEQUEUE_ZERO_COPY,
1205                                          &open_int, &dequeue_zero_copy);
1206                 if (ret < 0)
1207                         goto out_free;
1208
1209                 if (dequeue_zero_copy)
1210                         flags |= RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
1211         }
1212
1213         if (dev->device.numa_node == SOCKET_ID_ANY)
1214                 dev->device.numa_node = rte_socket_id();
1215
1216         eth_dev_vhost_create(dev, iface_name, queues, dev->device.numa_node,
1217                 flags);
1218
1219 out_free:
1220         rte_kvargs_free(kvlist);
1221         return ret;
1222 }
1223
1224 static int
1225 rte_pmd_vhost_remove(struct rte_vdev_device *dev)
1226 {
1227         const char *name;
1228         struct rte_eth_dev *eth_dev = NULL;
1229
1230         name = rte_vdev_device_name(dev);
1231         RTE_LOG(INFO, PMD, "Un-Initializing pmd_vhost for %s\n", name);
1232
1233         /* find an ethdev entry */
1234         eth_dev = rte_eth_dev_allocated(name);
1235         if (eth_dev == NULL)
1236                 return -ENODEV;
1237
1238         eth_dev_close(eth_dev);
1239
1240         rte_free(vring_states[eth_dev->data->port_id]);
1241         vring_states[eth_dev->data->port_id] = NULL;
1242
1243         rte_free(eth_dev->data);
1244
1245         rte_eth_dev_release_port(eth_dev);
1246
1247         return 0;
1248 }
1249
1250 static struct rte_vdev_driver pmd_vhost_drv = {
1251         .probe = rte_pmd_vhost_probe,
1252         .remove = rte_pmd_vhost_remove,
1253 };
1254
1255 RTE_PMD_REGISTER_VDEV(net_vhost, pmd_vhost_drv);
1256 RTE_PMD_REGISTER_ALIAS(net_vhost, eth_vhost);
1257 RTE_PMD_REGISTER_PARAM_STRING(net_vhost,
1258         "iface=<ifc> "
1259         "queues=<int>");