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_dev.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
  55 static const char *drivername = "VHOST PMD";
  56
  57 static const char *valid_arguments[] = {
  58         ETH_VHOST_IFACE_ARG,
  59         ETH_VHOST_QUEUES_ARG,
  60         ETH_VHOST_CLIENT_ARG,
  61         NULL
  62 };
  63
  64 static struct ether_addr base_eth_addr = {
  65         .addr_bytes = {
  66                 0x56 /* V */,
  67                 0x48 /* H */,
  68                 0x4F /* O */,
  69                 0x53 /* S */,
  70                 0x54 /* T */,
  71                 0x00
  72         }
  73 };
  74
  75 struct vhost_queue {
  76         int vid;
  77         rte_atomic32_t allow_queuing;
  78         rte_atomic32_t while_queuing;
  79         struct pmd_internal *internal;
  80         struct rte_mempool *mb_pool;
  81         uint8_t port;
  82         uint16_t virtqueue_id;
  83         uint64_t rx_pkts;
  84         uint64_t tx_pkts;
  85         uint64_t missed_pkts;
  86         uint64_t rx_bytes;
  87         uint64_t tx_bytes;
  88 };
  89
  90 struct pmd_internal {
  91         char *dev_name;
  92         char *iface_name;
  93         uint16_t max_queues;
  94         uint64_t flags;
  95
  96         volatile uint16_t once;
  97 };
  98
  99 struct internal_list {
 100         TAILQ_ENTRY(internal_list) next;
 101         struct rte_eth_dev *eth_dev;
 102 };
 103
 104 TAILQ_HEAD(internal_list_head, internal_list);
 105 static struct internal_list_head internal_list =
 106         TAILQ_HEAD_INITIALIZER(internal_list);
 107
 108 static pthread_mutex_t internal_list_lock = PTHREAD_MUTEX_INITIALIZER;
 109
 110 static rte_atomic16_t nb_started_ports;
 111 static pthread_t session_th;
 112
 113 static struct rte_eth_link pmd_link = {
 114                 .link_speed = 10000,
 115                 .link_duplex = ETH_LINK_FULL_DUPLEX,
 116                 .link_status = ETH_LINK_DOWN
 117 };
 118
 119 struct rte_vhost_vring_state {
 120         rte_spinlock_t lock;
 121
 122         bool cur[RTE_MAX_QUEUES_PER_PORT * 2];
 123         bool seen[RTE_MAX_QUEUES_PER_PORT * 2];
 124         unsigned int index;
 125         unsigned int max_vring;
 126 };
 127
 128 static struct rte_vhost_vring_state *vring_states[RTE_MAX_ETHPORTS];
 129
 130 static uint16_t
 131 eth_vhost_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
 132 {
 133         struct vhost_queue *r = q;
 134         uint16_t i, nb_rx = 0;
 135
 136         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 137                 return 0;
 138
 139         rte_atomic32_set(&r->while_queuing, 1);
 140
 141         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 142                 goto out;
 143
 144         /* Dequeue packets from guest TX queue */
 145         nb_rx = rte_vhost_dequeue_burst(r->vid,
 146                         r->virtqueue_id, r->mb_pool, bufs, nb_bufs);
 147
 148         r->rx_pkts += nb_rx;
 149
 150         for (i = 0; likely(i < nb_rx); i++) {
 151                 bufs[i]->port = r->port;
 152                 r->rx_bytes += bufs[i]->pkt_len;
 153         }
 154
 155 out:
 156         rte_atomic32_set(&r->while_queuing, 0);
 157
 158         return nb_rx;
 159 }
 160
 161 static uint16_t
 162 eth_vhost_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
 163 {
 164         struct vhost_queue *r = q;
 165         uint16_t i, nb_tx = 0;
 166
 167         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 168                 return 0;
 169
 170         rte_atomic32_set(&r->while_queuing, 1);
 171
 172         if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
 173                 goto out;
 174
 175         /* Enqueue packets to guest RX queue */
 176         nb_tx = rte_vhost_enqueue_burst(r->vid,
 177                         r->virtqueue_id, bufs, nb_bufs);
 178
 179         r->tx_pkts += nb_tx;
 180         r->missed_pkts += nb_bufs - nb_tx;
 181
 182         for (i = 0; likely(i < nb_tx); i++)
 183                 r->tx_bytes += bufs[i]->pkt_len;
 184
 185         for (i = 0; likely(i < nb_tx); i++)
 186                 rte_pktmbuf_free(bufs[i]);
 187 out:
 188         rte_atomic32_set(&r->while_queuing, 0);
 189
 190         return nb_tx;
 191 }
 192
 193 static int
 194 eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
 195 {
 196         return 0;
 197 }
 198
 199 static inline struct internal_list *
 200 find_internal_resource(char *ifname)
 201 {
 202         int found = 0;
 203         struct internal_list *list;
 204         struct pmd_internal *internal;
 205
 206         if (ifname == NULL)
 207                 return NULL;
 208
 209         pthread_mutex_lock(&internal_list_lock);
 210
 211         TAILQ_FOREACH(list, &internal_list, next) {
 212                 internal = list->eth_dev->data->dev_private;
 213                 if (!strcmp(internal->iface_name, ifname)) {
 214                         found = 1;
 215                         break;
 216                 }
 217         }
 218
 219         pthread_mutex_unlock(&internal_list_lock);
 220
 221         if (!found)
 222                 return NULL;
 223
 224         return list;
 225 }
 226
 227 static int
 228 new_device(int vid)
 229 {
 230         struct rte_eth_dev *eth_dev;
 231         struct internal_list *list;
 232         struct pmd_internal *internal;
 233         struct vhost_queue *vq;
 234         unsigned i;
 235         char ifname[PATH_MAX];
 236 #ifdef RTE_LIBRTE_VHOST_NUMA
 237         int newnode;
 238 #endif
 239
 240         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 241         list = find_internal_resource(ifname);
 242         if (list == NULL) {
 243                 RTE_LOG(INFO, PMD, "Invalid device name: %s\n", ifname);
 244                 return -1;
 245         }
 246
 247         eth_dev = list->eth_dev;
 248         internal = eth_dev->data->dev_private;
 249
 250 #ifdef RTE_LIBRTE_VHOST_NUMA
 251         newnode = rte_vhost_get_numa_node(vid);
 252         if (newnode >= 0)
 253                 eth_dev->data->numa_node = newnode;
 254 #endif
 255
 256         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 257                 vq = eth_dev->data->rx_queues[i];
 258                 if (vq == NULL)
 259                         continue;
 260                 vq->vid = vid;
 261                 vq->internal = internal;
 262                 vq->port = eth_dev->data->port_id;
 263         }
 264         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 265                 vq = eth_dev->data->tx_queues[i];
 266                 if (vq == NULL)
 267                         continue;
 268                 vq->vid = vid;
 269                 vq->internal = internal;
 270                 vq->port = eth_dev->data->port_id;
 271         }
 272
 273         for (i = 0; i < rte_vhost_get_queue_num(vid) * VIRTIO_QNUM; i++)
 274                 rte_vhost_enable_guest_notification(vid, i, 0);
 275
 276         eth_dev->data->dev_link.link_status = ETH_LINK_UP;
 277
 278         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 279                 vq = eth_dev->data->rx_queues[i];
 280                 if (vq == NULL)
 281                         continue;
 282                 rte_atomic32_set(&vq->allow_queuing, 1);
 283         }
 284         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 285                 vq = eth_dev->data->tx_queues[i];
 286                 if (vq == NULL)
 287                         continue;
 288                 rte_atomic32_set(&vq->allow_queuing, 1);
 289         }
 290
 291         RTE_LOG(INFO, PMD, "New connection established\n");
 292
 293         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC);
 294
 295         return 0;
 296 }
 297
 298 static void
 299 destroy_device(int vid)
 300 {
 301         struct rte_eth_dev *eth_dev;
 302         struct vhost_queue *vq;
 303         struct internal_list *list;
 304         char ifname[PATH_MAX];
 305         unsigned i;
 306         struct rte_vhost_vring_state *state;
 307
 308         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 309         list = find_internal_resource(ifname);
 310         if (list == NULL) {
 311                 RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname);
 312                 return;
 313         }
 314         eth_dev = list->eth_dev;
 315
 316         /* Wait until rx/tx_pkt_burst stops accessing vhost device */
 317         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 318                 vq = eth_dev->data->rx_queues[i];
 319                 if (vq == NULL)
 320                         continue;
 321                 rte_atomic32_set(&vq->allow_queuing, 0);
 322                 while (rte_atomic32_read(&vq->while_queuing))
 323                         rte_pause();
 324         }
 325         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 326                 vq = eth_dev->data->tx_queues[i];
 327                 if (vq == NULL)
 328                         continue;
 329                 rte_atomic32_set(&vq->allow_queuing, 0);
 330                 while (rte_atomic32_read(&vq->while_queuing))
 331                         rte_pause();
 332         }
 333
 334         eth_dev->data->dev_link.link_status = ETH_LINK_DOWN;
 335
 336         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 337                 vq = eth_dev->data->rx_queues[i];
 338                 if (vq == NULL)
 339                         continue;
 340                 vq->vid = -1;
 341         }
 342         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 343                 vq = eth_dev->data->tx_queues[i];
 344                 if (vq == NULL)
 345                         continue;
 346                 vq->vid = -1;
 347         }
 348
 349         state = vring_states[eth_dev->data->port_id];
 350         rte_spinlock_lock(&state->lock);
 351         for (i = 0; i <= state->max_vring; i++) {
 352                 state->cur[i] = false;
 353                 state->seen[i] = false;
 354         }
 355         state->max_vring = 0;
 356         rte_spinlock_unlock(&state->lock);
 357
 358         RTE_LOG(INFO, PMD, "Connection closed\n");
 359
 360         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC);
 361 }
 362
 363 static int
 364 vring_state_changed(int vid, uint16_t vring, int enable)
 365 {
 366         struct rte_vhost_vring_state *state;
 367         struct rte_eth_dev *eth_dev;
 368         struct internal_list *list;
 369         char ifname[PATH_MAX];
 370
 371         rte_vhost_get_ifname(vid, ifname, sizeof(ifname));
 372         list = find_internal_resource(ifname);
 373         if (list == NULL) {
 374                 RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname);
 375                 return -1;
 376         }
 377
 378         eth_dev = list->eth_dev;
 379         /* won't be NULL */
 380         state = vring_states[eth_dev->data->port_id];
 381         rte_spinlock_lock(&state->lock);
 382         state->cur[vring] = enable;
 383         state->max_vring = RTE_MAX(vring, state->max_vring);
 384         rte_spinlock_unlock(&state->lock);
 385
 386         RTE_LOG(INFO, PMD, "vring%u is %s\n",
 387                         vring, enable ? "enabled" : "disabled");
 388
 389         _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_QUEUE_STATE);
 390
 391         return 0;
 392 }
 393
 394 int
 395 rte_eth_vhost_get_queue_event(uint8_t port_id,
 396                 struct rte_eth_vhost_queue_event *event)
 397 {
 398         struct rte_vhost_vring_state *state;
 399         unsigned int i;
 400         int idx;
 401
 402         if (port_id >= RTE_MAX_ETHPORTS) {
 403                 RTE_LOG(ERR, PMD, "Invalid port id\n");
 404                 return -1;
 405         }
 406
 407         state = vring_states[port_id];
 408         if (!state) {
 409                 RTE_LOG(ERR, PMD, "Unused port\n");
 410                 return -1;
 411         }
 412
 413         rte_spinlock_lock(&state->lock);
 414         for (i = 0; i <= state->max_vring; i++) {
 415                 idx = state->index++ % (state->max_vring + 1);
 416
 417                 if (state->cur[idx] != state->seen[idx]) {
 418                         state->seen[idx] = state->cur[idx];
 419                         event->queue_id = idx / 2;
 420                         event->rx = idx & 1;
 421                         event->enable = state->cur[idx];
 422                         rte_spinlock_unlock(&state->lock);
 423                         return 0;
 424                 }
 425         }
 426         rte_spinlock_unlock(&state->lock);
 427
 428         return -1;
 429 }
 430
 431 static void *
 432 vhost_driver_session(void *param __rte_unused)
 433 {
 434         static struct virtio_net_device_ops vhost_ops;
 435
 436         /* set vhost arguments */
 437         vhost_ops.new_device = new_device;
 438         vhost_ops.destroy_device = destroy_device;
 439         vhost_ops.vring_state_changed = vring_state_changed;
 440         if (rte_vhost_driver_callback_register(&vhost_ops) < 0)
 441                 RTE_LOG(ERR, PMD, "Can't register callbacks\n");
 442
 443         /* start event handling */
 444         rte_vhost_driver_session_start();
 445
 446         return NULL;
 447 }
 448
 449 static int
 450 vhost_driver_session_start(void)
 451 {
 452         int ret;
 453
 454         ret = pthread_create(&session_th,
 455                         NULL, vhost_driver_session, NULL);
 456         if (ret)
 457                 RTE_LOG(ERR, PMD, "Can't create a thread\n");
 458
 459         return ret;
 460 }
 461
 462 static void
 463 vhost_driver_session_stop(void)
 464 {
 465         int ret;
 466
 467         ret = pthread_cancel(session_th);
 468         if (ret)
 469                 RTE_LOG(ERR, PMD, "Can't cancel the thread\n");
 470
 471         ret = pthread_join(session_th, NULL);
 472         if (ret)
 473                 RTE_LOG(ERR, PMD, "Can't join the thread\n");
 474 }
 475
 476 static int
 477 eth_dev_start(struct rte_eth_dev *dev)
 478 {
 479         struct pmd_internal *internal = dev->data->dev_private;
 480         int ret = 0;
 481
 482         if (rte_atomic16_cmpset(&internal->once, 0, 1)) {
 483                 ret = rte_vhost_driver_register(internal->iface_name,
 484                                                 internal->flags);
 485                 if (ret)
 486                         return ret;
 487         }
 488
 489         /* We need only one message handling thread */
 490         if (rte_atomic16_add_return(&nb_started_ports, 1) == 1)
 491                 ret = vhost_driver_session_start();
 492
 493         return ret;
 494 }
 495
 496 static void
 497 eth_dev_stop(struct rte_eth_dev *dev)
 498 {
 499         struct pmd_internal *internal = dev->data->dev_private;
 500
 501         if (rte_atomic16_cmpset(&internal->once, 1, 0))
 502                 rte_vhost_driver_unregister(internal->iface_name);
 503
 504         if (rte_atomic16_sub_return(&nb_started_ports, 1) == 0)
 505                 vhost_driver_session_stop();
 506 }
 507
 508 static int
 509 eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 510                    uint16_t nb_rx_desc __rte_unused,
 511                    unsigned int socket_id,
 512                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 513                    struct rte_mempool *mb_pool)
 514 {
 515         struct vhost_queue *vq;
 516
 517         vq = rte_zmalloc_socket(NULL, sizeof(struct vhost_queue),
 518                         RTE_CACHE_LINE_SIZE, socket_id);
 519         if (vq == NULL) {
 520                 RTE_LOG(ERR, PMD, "Failed to allocate memory for rx queue\n");
 521                 return -ENOMEM;
 522         }
 523
 524         vq->mb_pool = mb_pool;
 525         vq->virtqueue_id = rx_queue_id * VIRTIO_QNUM + VIRTIO_TXQ;
 526         dev->data->rx_queues[rx_queue_id] = vq;
 527
 528         return 0;
 529 }
 530
 531 static int
 532 eth_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 533                    uint16_t nb_tx_desc __rte_unused,
 534                    unsigned int socket_id,
 535                    const struct rte_eth_txconf *tx_conf __rte_unused)
 536 {
 537         struct vhost_queue *vq;
 538
 539         vq = rte_zmalloc_socket(NULL, sizeof(struct vhost_queue),
 540                         RTE_CACHE_LINE_SIZE, socket_id);
 541         if (vq == NULL) {
 542                 RTE_LOG(ERR, PMD, "Failed to allocate memory for tx queue\n");
 543                 return -ENOMEM;
 544         }
 545
 546         vq->virtqueue_id = tx_queue_id * VIRTIO_QNUM + VIRTIO_RXQ;
 547         dev->data->tx_queues[tx_queue_id] = vq;
 548
 549         return 0;
 550 }
 551
 552 static void
 553 eth_dev_info(struct rte_eth_dev *dev,
 554              struct rte_eth_dev_info *dev_info)
 555 {
 556         struct pmd_internal *internal;
 557
 558         internal = dev->data->dev_private;
 559         if (internal == NULL) {
 560                 RTE_LOG(ERR, PMD, "Invalid device specified\n");
 561                 return;
 562         }
 563
 564         dev_info->driver_name = drivername;
 565         dev_info->max_mac_addrs = 1;
 566         dev_info->max_rx_pktlen = (uint32_t)-1;
 567         dev_info->max_rx_queues = internal->max_queues;
 568         dev_info->max_tx_queues = internal->max_queues;
 569         dev_info->min_rx_bufsize = 0;
 570 }
 571
 572 static void
 573 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 574 {
 575         unsigned i;
 576         unsigned long rx_total = 0, tx_total = 0, tx_missed_total = 0;
 577         unsigned long rx_total_bytes = 0, tx_total_bytes = 0;
 578         struct vhost_queue *vq;
 579
 580         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 581                         i < dev->data->nb_rx_queues; i++) {
 582                 if (dev->data->rx_queues[i] == NULL)
 583                         continue;
 584                 vq = dev->data->rx_queues[i];
 585                 stats->q_ipackets[i] = vq->rx_pkts;
 586                 rx_total += stats->q_ipackets[i];
 587
 588                 stats->q_ibytes[i] = vq->rx_bytes;
 589                 rx_total_bytes += stats->q_ibytes[i];
 590         }
 591
 592         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 593                         i < dev->data->nb_tx_queues; i++) {
 594                 if (dev->data->tx_queues[i] == NULL)
 595                         continue;
 596                 vq = dev->data->tx_queues[i];
 597                 stats->q_opackets[i] = vq->tx_pkts;
 598                 tx_missed_total += vq->missed_pkts;
 599                 tx_total += stats->q_opackets[i];
 600
 601                 stats->q_obytes[i] = vq->tx_bytes;
 602                 tx_total_bytes += stats->q_obytes[i];
 603         }
 604
 605         stats->ipackets = rx_total;
 606         stats->opackets = tx_total;
 607         stats->oerrors = tx_missed_total;
 608         stats->ibytes = rx_total_bytes;
 609         stats->obytes = tx_total_bytes;
 610 }
 611
 612 static void
 613 eth_stats_reset(struct rte_eth_dev *dev)
 614 {
 615         struct vhost_queue *vq;
 616         unsigned i;
 617
 618         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 619                 if (dev->data->rx_queues[i] == NULL)
 620                         continue;
 621                 vq = dev->data->rx_queues[i];
 622                 vq->rx_pkts = 0;
 623                 vq->rx_bytes = 0;
 624         }
 625         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 626                 if (dev->data->tx_queues[i] == NULL)
 627                         continue;
 628                 vq = dev->data->tx_queues[i];
 629                 vq->tx_pkts = 0;
 630                 vq->tx_bytes = 0;
 631                 vq->missed_pkts = 0;
 632         }
 633 }
 634
 635 static void
 636 eth_queue_release(void *q)
 637 {
 638         rte_free(q);
 639 }
 640
 641 static int
 642 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 643                 int wait_to_complete __rte_unused)
 644 {
 645         return 0;
 646 }
 647
 648 /**
 649  * Disable features in feature_mask. Returns 0 on success.
 650  */
 651 int
 652 rte_eth_vhost_feature_disable(uint64_t feature_mask)
 653 {
 654         return rte_vhost_feature_disable(feature_mask);
 655 }
 656
 657 /**
 658  * Enable features in feature_mask. Returns 0 on success.
 659  */
 660 int
 661 rte_eth_vhost_feature_enable(uint64_t feature_mask)
 662 {
 663         return rte_vhost_feature_enable(feature_mask);
 664 }
 665
 666 /* Returns currently supported vhost features */
 667 uint64_t
 668 rte_eth_vhost_feature_get(void)
 669 {
 670         return rte_vhost_feature_get();
 671 }
 672
 673 static const struct eth_dev_ops ops = {
 674         .dev_start = eth_dev_start,
 675         .dev_stop = eth_dev_stop,
 676         .dev_configure = eth_dev_configure,
 677         .dev_infos_get = eth_dev_info,
 678         .rx_queue_setup = eth_rx_queue_setup,
 679         .tx_queue_setup = eth_tx_queue_setup,
 680         .rx_queue_release = eth_queue_release,
 681         .tx_queue_release = eth_queue_release,
 682         .link_update = eth_link_update,
 683         .stats_get = eth_stats_get,
 684         .stats_reset = eth_stats_reset,
 685 };
 686
 687 static int
 688 eth_dev_vhost_create(const char *name, char *iface_name, int16_t queues,
 689                      const unsigned numa_node, uint64_t flags)
 690 {
 691         struct rte_eth_dev_data *data = NULL;
 692         struct pmd_internal *internal = NULL;
 693         struct rte_eth_dev *eth_dev = NULL;
 694         struct ether_addr *eth_addr = NULL;
 695         struct rte_vhost_vring_state *vring_state = NULL;
 696         struct internal_list *list = NULL;
 697
 698         RTE_LOG(INFO, PMD, "Creating VHOST-USER backend on numa socket %u\n",
 699                 numa_node);
 700
 701         /* now do all data allocation - for eth_dev structure, dummy pci driver
 702          * and internal (private) data
 703          */
 704         data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
 705         if (data == NULL)
 706                 goto error;
 707
 708         internal = rte_zmalloc_socket(name, sizeof(*internal), 0, numa_node);
 709         if (internal == NULL)
 710                 goto error;
 711
 712         list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
 713         if (list == NULL)
 714                 goto error;
 715
 716         /* reserve an ethdev entry */
 717         eth_dev = rte_eth_dev_allocate(name, RTE_ETH_DEV_VIRTUAL);
 718         if (eth_dev == NULL)
 719                 goto error;
 720
 721         eth_addr = rte_zmalloc_socket(name, sizeof(*eth_addr), 0, numa_node);
 722         if (eth_addr == NULL)
 723                 goto error;
 724         *eth_addr = base_eth_addr;
 725         eth_addr->addr_bytes[5] = eth_dev->data->port_id;
 726
 727         vring_state = rte_zmalloc_socket(name,
 728                         sizeof(*vring_state), 0, numa_node);
 729         if (vring_state == NULL)
 730                 goto error;
 731
 732         TAILQ_INIT(&eth_dev->link_intr_cbs);
 733
 734         /* now put it all together
 735          * - store queue data in internal,
 736          * - store numa_node info in ethdev data
 737          * - point eth_dev_data to internals
 738          * - and point eth_dev structure to new eth_dev_data structure
 739          */
 740         internal->dev_name = strdup(name);
 741         if (internal->dev_name == NULL)
 742                 goto error;
 743         internal->iface_name = strdup(iface_name);
 744         if (internal->iface_name == NULL)
 745                 goto error;
 746         internal->flags = flags;
 747
 748         list->eth_dev = eth_dev;
 749         pthread_mutex_lock(&internal_list_lock);
 750         TAILQ_INSERT_TAIL(&internal_list, list, next);
 751         pthread_mutex_unlock(&internal_list_lock);
 752
 753         rte_spinlock_init(&vring_state->lock);
 754         vring_states[eth_dev->data->port_id] = vring_state;
 755
 756         data->dev_private = internal;
 757         data->port_id = eth_dev->data->port_id;
 758         memmove(data->name, eth_dev->data->name, sizeof(data->name));
 759         data->nb_rx_queues = queues;
 760         data->nb_tx_queues = queues;
 761         internal->max_queues = queues;
 762         data->dev_link = pmd_link;
 763         data->mac_addrs = eth_addr;
 764
 765         /* We'll replace the 'data' originally allocated by eth_dev. So the
 766          * vhost PMD resources won't be shared between multi processes.
 767          */
 768         eth_dev->data = data;
 769         eth_dev->dev_ops = &ops;
 770         eth_dev->driver = NULL;
 771         data->dev_flags =
 772                 RTE_ETH_DEV_DETACHABLE | RTE_ETH_DEV_INTR_LSC;
 773         data->kdrv = RTE_KDRV_NONE;
 774         data->drv_name = internal->dev_name;
 775         data->numa_node = numa_node;
 776
 777         /* finally assign rx and tx ops */
 778         eth_dev->rx_pkt_burst = eth_vhost_rx;
 779         eth_dev->tx_pkt_burst = eth_vhost_tx;
 780
 781         return data->port_id;
 782
 783 error:
 784         if (internal)
 785                 free(internal->dev_name);
 786         rte_free(vring_state);
 787         rte_free(eth_addr);
 788         if (eth_dev)
 789                 rte_eth_dev_release_port(eth_dev);
 790         rte_free(internal);
 791         rte_free(list);
 792         rte_free(data);
 793
 794         return -1;
 795 }
 796
 797 static inline int
 798 open_iface(const char *key __rte_unused, const char *value, void *extra_args)
 799 {
 800         const char **iface_name = extra_args;
 801
 802         if (value == NULL)
 803                 return -1;
 804
 805         *iface_name = value;
 806
 807         return 0;
 808 }
 809
 810 static inline int
 811 open_int(const char *key __rte_unused, const char *value, void *extra_args)
 812 {
 813         uint16_t *n = extra_args;
 814
 815         if (value == NULL || extra_args == NULL)
 816                 return -EINVAL;
 817
 818         *n = (uint16_t)strtoul(value, NULL, 0);
 819         if (*n == USHRT_MAX && errno == ERANGE)
 820                 return -1;
 821
 822         return 0;
 823 }
 824
 825 static int
 826 rte_pmd_vhost_devinit(const char *name, const char *params)
 827 {
 828         struct rte_kvargs *kvlist = NULL;
 829         int ret = 0;
 830         char *iface_name;
 831         uint16_t queues;
 832         uint64_t flags = 0;
 833         int client_mode = 0;
 834
 835         RTE_LOG(INFO, PMD, "Initializing pmd_vhost for %s\n", name);
 836
 837         kvlist = rte_kvargs_parse(params, valid_arguments);
 838         if (kvlist == NULL)
 839                 return -1;
 840
 841         if (rte_kvargs_count(kvlist, ETH_VHOST_IFACE_ARG) == 1) {
 842                 ret = rte_kvargs_process(kvlist, ETH_VHOST_IFACE_ARG,
 843                                          &open_iface, &iface_name);
 844                 if (ret < 0)
 845                         goto out_free;
 846         } else {
 847                 ret = -1;
 848                 goto out_free;
 849         }
 850
 851         if (rte_kvargs_count(kvlist, ETH_VHOST_QUEUES_ARG) == 1) {
 852                 ret = rte_kvargs_process(kvlist, ETH_VHOST_QUEUES_ARG,
 853                                          &open_int, &queues);
 854                 if (ret < 0 || queues > RTE_MAX_QUEUES_PER_PORT)
 855                         goto out_free;
 856
 857         } else
 858                 queues = 1;
 859
 860         if (rte_kvargs_count(kvlist, ETH_VHOST_CLIENT_ARG) == 1) {
 861                 ret = rte_kvargs_process(kvlist, ETH_VHOST_CLIENT_ARG,
 862                                          &open_int, &client_mode);
 863                 if (ret < 0)
 864                         goto out_free;
 865
 866                 if (client_mode)
 867                         flags |= RTE_VHOST_USER_CLIENT;
 868         }
 869
 870         eth_dev_vhost_create(name, iface_name, queues, rte_socket_id(), flags);
 871
 872 out_free:
 873         rte_kvargs_free(kvlist);
 874         return ret;
 875 }
 876
 877 static int
 878 rte_pmd_vhost_devuninit(const char *name)
 879 {
 880         struct rte_eth_dev *eth_dev = NULL;
 881         struct pmd_internal *internal;
 882         struct internal_list *list;
 883         unsigned int i;
 884
 885         RTE_LOG(INFO, PMD, "Un-Initializing pmd_vhost for %s\n", name);
 886
 887         /* find an ethdev entry */
 888         eth_dev = rte_eth_dev_allocated(name);
 889         if (eth_dev == NULL)
 890                 return -ENODEV;
 891
 892         internal = eth_dev->data->dev_private;
 893         if (internal == NULL)
 894                 return -ENODEV;
 895
 896         list = find_internal_resource(internal->iface_name);
 897         if (list == NULL)
 898                 return -ENODEV;
 899
 900         pthread_mutex_lock(&internal_list_lock);
 901         TAILQ_REMOVE(&internal_list, list, next);
 902         pthread_mutex_unlock(&internal_list_lock);
 903         rte_free(list);
 904
 905         eth_dev_stop(eth_dev);
 906
 907         rte_free(vring_states[eth_dev->data->port_id]);
 908         vring_states[eth_dev->data->port_id] = NULL;
 909
 910         free(internal->dev_name);
 911         free(internal->iface_name);
 912
 913         for (i = 0; i < eth_dev->data->nb_rx_queues; i++)
 914                 rte_free(eth_dev->data->rx_queues[i]);
 915         for (i = 0; i < eth_dev->data->nb_tx_queues; i++)
 916                 rte_free(eth_dev->data->tx_queues[i]);
 917
 918         rte_free(eth_dev->data->mac_addrs);
 919         rte_free(eth_dev->data);
 920         rte_free(internal);
 921
 922         rte_eth_dev_release_port(eth_dev);
 923
 924         return 0;
 925 }
 926
 927 static struct rte_driver pmd_vhost_drv = {
 928         .type = PMD_VDEV,
 929         .init = rte_pmd_vhost_devinit,
 930         .uninit = rte_pmd_vhost_devuninit,
 931 };
 932
 933 PMD_REGISTER_DRIVER(pmd_vhost_drv, eth_vhost);
 934 DRIVER_REGISTER_PARAM_STRING(eth_vhost,
 935         "iface=<ifc> "
 936         "queues=<int>");