drivers/net/virtio/virtio_user/virtio_user_dev.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2016 Intel Corporation
   3  */
   4
   5 #include <stdint.h>
   6 #include <stdio.h>
   7 #include <fcntl.h>
   8 #include <string.h>
   9 #include <errno.h>
  10 #include <sys/mman.h>
  11 #include <unistd.h>
  12 #include <sys/eventfd.h>
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15
  16 #include <rte_eal_memconfig.h>
  17
  18 #include "vhost.h"
  19 #include "virtio_user_dev.h"
  20 #include "../virtio_ethdev.h"
  21
  22 #define VIRTIO_USER_MEM_EVENT_CLB_NAME "virtio_user_mem_event_clb"
  23
  24 static int
  25 virtio_user_create_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  26 {
  27         /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come
  28          * firstly because vhost depends on this msg to allocate virtqueue
  29          * pair.
  30          */
  31         struct vhost_vring_file file;
  32
  33         file.index = queue_sel;
  34         file.fd = dev->callfds[queue_sel];
  35         dev->ops->send_request(dev, VHOST_USER_SET_VRING_CALL, &file);
  36
  37         return 0;
  38 }
  39
  40 static int
  41 virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  42 {
  43         struct vhost_vring_file file;
  44         struct vhost_vring_state state;
  45         struct vring *vring = &dev->vrings[queue_sel];
  46         struct vhost_vring_addr addr = {
  47                 .index = queue_sel,
  48                 .desc_user_addr = (uint64_t)(uintptr_t)vring->desc,
  49                 .avail_user_addr = (uint64_t)(uintptr_t)vring->avail,
  50                 .used_user_addr = (uint64_t)(uintptr_t)vring->used,
  51                 .log_guest_addr = 0,
  52                 .flags = 0, /* disable log */
  53         };
  54
  55         state.index = queue_sel;
  56         state.num = vring->num;
  57         dev->ops->send_request(dev, VHOST_USER_SET_VRING_NUM, &state);
  58
  59         state.index = queue_sel;
  60         state.num = 0; /* no reservation */
  61         if (dev->features & (1ULL << VIRTIO_F_RING_PACKED))
  62                 state.num |= (1 << 15);
  63         dev->ops->send_request(dev, VHOST_USER_SET_VRING_BASE, &state);
  64
  65         dev->ops->send_request(dev, VHOST_USER_SET_VRING_ADDR, &addr);
  66
  67         /* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
  68          * lastly because vhost depends on this msg to judge if
  69          * virtio is ready.
  70          */
  71         file.index = queue_sel;
  72         file.fd = dev->kickfds[queue_sel];
  73         dev->ops->send_request(dev, VHOST_USER_SET_VRING_KICK, &file);
  74
  75         return 0;
  76 }
  77
  78 static int
  79 virtio_user_queue_setup(struct virtio_user_dev *dev,
  80                         int (*fn)(struct virtio_user_dev *, uint32_t))
  81 {
  82         uint32_t i, queue_sel;
  83
  84         for (i = 0; i < dev->max_queue_pairs; ++i) {
  85                 queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX;
  86                 if (fn(dev, queue_sel) < 0) {
  87                         PMD_DRV_LOG(INFO, "setup rx vq fails: %u", i);
  88                         return -1;
  89                 }
  90         }
  91         for (i = 0; i < dev->max_queue_pairs; ++i) {
  92                 queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX;
  93                 if (fn(dev, queue_sel) < 0) {
  94                         PMD_DRV_LOG(INFO, "setup tx vq fails: %u", i);
  95                         return -1;
  96                 }
  97         }
  98
  99         return 0;
 100 }
 101
 102 int
 103 is_vhost_user_by_type(const char *path)
 104 {
 105         struct stat sb;
 106
 107         if (stat(path, &sb) == -1)
 108                 return 0;
 109
 110         return S_ISSOCK(sb.st_mode);
 111 }
 112
 113 int
 114 virtio_user_start_device(struct virtio_user_dev *dev)
 115 {
 116         struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
 117         uint64_t features;
 118         int ret;
 119
 120         /*
 121          * XXX workaround!
 122          *
 123          * We need to make sure that the locks will be
 124          * taken in the correct order to avoid deadlocks.
 125          *
 126          * Before releasing this lock, this thread should
 127          * not trigger any memory hotplug events.
 128          *
 129          * This is a temporary workaround, and should be
 130          * replaced when we get proper supports from the
 131          * memory subsystem in the future.
 132          */
 133         rte_rwlock_read_lock(&mcfg->memory_hotplug_lock);
 134         pthread_mutex_lock(&dev->mutex);
 135
 136         if (is_vhost_user_by_type(dev->path) && dev->vhostfd < 0)
 137                 goto error;
 138
 139         /* Step 0: tell vhost to create queues */
 140         if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
 141                 goto error;
 142
 143         /* Step 1: set features */
 144         features = dev->features;
 145         /* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */
 146         features &= ~(1ull << VIRTIO_NET_F_MAC);
 147         /* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
 148         features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
 149         features &= ~(1ull << VIRTIO_NET_F_STATUS);
 150         ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
 151         if (ret < 0)
 152                 goto error;
 153         PMD_DRV_LOG(INFO, "set features: %" PRIx64, features);
 154
 155         /* Step 2: share memory regions */
 156         ret = dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL);
 157         if (ret < 0)
 158                 goto error;
 159
 160         /* Step 3: kick queues */
 161         if (virtio_user_queue_setup(dev, virtio_user_kick_queue) < 0)
 162                 goto error;
 163
 164         /* Step 4: enable queues
 165          * we enable the 1st queue pair by default.
 166          */
 167         dev->ops->enable_qp(dev, 0, 1);
 168
 169         dev->started = true;
 170         pthread_mutex_unlock(&dev->mutex);
 171         rte_rwlock_read_unlock(&mcfg->memory_hotplug_lock);
 172
 173         return 0;
 174 error:
 175         pthread_mutex_unlock(&dev->mutex);
 176         rte_rwlock_read_unlock(&mcfg->memory_hotplug_lock);
 177         /* TODO: free resource here or caller to check */
 178         return -1;
 179 }
 180
 181 int virtio_user_stop_device(struct virtio_user_dev *dev)
 182 {
 183         struct vhost_vring_state state;
 184         uint32_t i;
 185         int error = 0;
 186
 187         pthread_mutex_lock(&dev->mutex);
 188         if (!dev->started)
 189                 goto out;
 190
 191         for (i = 0; i < dev->max_queue_pairs; ++i)
 192                 dev->ops->enable_qp(dev, i, 0);
 193
 194         /* Stop the backend. */
 195         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 196                 state.index = i;
 197                 if (dev->ops->send_request(dev, VHOST_USER_GET_VRING_BASE,
 198                                            &state) < 0) {
 199                         PMD_DRV_LOG(ERR, "get_vring_base failed, index=%u\n",
 200                                     i);
 201                         error = -1;
 202                         goto out;
 203                 }
 204         }
 205
 206         dev->started = false;
 207 out:
 208         pthread_mutex_unlock(&dev->mutex);
 209
 210         return error;
 211 }
 212
 213 static inline void
 214 parse_mac(struct virtio_user_dev *dev, const char *mac)
 215 {
 216         int i, r;
 217         uint32_t tmp[ETHER_ADDR_LEN];
 218
 219         if (!mac)
 220                 return;
 221
 222         r = sscanf(mac, "%x:%x:%x:%x:%x:%x", &tmp[0],
 223                         &tmp[1], &tmp[2], &tmp[3], &tmp[4], &tmp[5]);
 224         if (r == ETHER_ADDR_LEN) {
 225                 for (i = 0; i < ETHER_ADDR_LEN; ++i)
 226                         dev->mac_addr[i] = (uint8_t)tmp[i];
 227                 dev->mac_specified = 1;
 228         } else {
 229                 /* ignore the wrong mac, use random mac */
 230                 PMD_DRV_LOG(ERR, "wrong format of mac: %s", mac);
 231         }
 232 }
 233
 234 static int
 235 virtio_user_dev_init_notify(struct virtio_user_dev *dev)
 236 {
 237         uint32_t i, j;
 238         int callfd;
 239         int kickfd;
 240
 241         for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; ++i) {
 242                 if (i >= dev->max_queue_pairs * 2) {
 243                         dev->kickfds[i] = -1;
 244                         dev->callfds[i] = -1;
 245                         continue;
 246                 }
 247
 248                 /* May use invalid flag, but some backend uses kickfd and
 249                  * callfd as criteria to judge if dev is alive. so finally we
 250                  * use real event_fd.
 251                  */
 252                 callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 253                 if (callfd < 0) {
 254                         PMD_DRV_LOG(ERR, "callfd error, %s", strerror(errno));
 255                         break;
 256                 }
 257                 kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 258                 if (kickfd < 0) {
 259                         PMD_DRV_LOG(ERR, "kickfd error, %s", strerror(errno));
 260                         break;
 261                 }
 262                 dev->callfds[i] = callfd;
 263                 dev->kickfds[i] = kickfd;
 264         }
 265
 266         if (i < VIRTIO_MAX_VIRTQUEUES) {
 267                 for (j = 0; j <= i; ++j) {
 268                         close(dev->callfds[j]);
 269                         close(dev->kickfds[j]);
 270                 }
 271
 272                 return -1;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static int
 279 virtio_user_fill_intr_handle(struct virtio_user_dev *dev)
 280 {
 281         uint32_t i;
 282         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
 283
 284         if (!eth_dev->intr_handle) {
 285                 eth_dev->intr_handle = malloc(sizeof(*eth_dev->intr_handle));
 286                 if (!eth_dev->intr_handle) {
 287                         PMD_DRV_LOG(ERR, "fail to allocate intr_handle");
 288                         return -1;
 289                 }
 290                 memset(eth_dev->intr_handle, 0, sizeof(*eth_dev->intr_handle));
 291         }
 292
 293         for (i = 0; i < dev->max_queue_pairs; ++i)
 294                 eth_dev->intr_handle->efds[i] = dev->callfds[i];
 295         eth_dev->intr_handle->nb_efd = dev->max_queue_pairs;
 296         eth_dev->intr_handle->max_intr = dev->max_queue_pairs + 1;
 297         eth_dev->intr_handle->type = RTE_INTR_HANDLE_VDEV;
 298         /* For virtio vdev, no need to read counter for clean */
 299         eth_dev->intr_handle->efd_counter_size = 0;
 300         eth_dev->intr_handle->fd = -1;
 301         if (dev->vhostfd >= 0)
 302                 eth_dev->intr_handle->fd = dev->vhostfd;
 303         else if (dev->is_server)
 304                 eth_dev->intr_handle->fd = dev->listenfd;
 305
 306         return 0;
 307 }
 308
 309 static void
 310 virtio_user_mem_event_cb(enum rte_mem_event type __rte_unused,
 311                                                  const void *addr __rte_unused,
 312                                                  size_t len __rte_unused,
 313                                                  void *arg)
 314 {
 315         struct virtio_user_dev *dev = arg;
 316         struct rte_memseg_list *msl;
 317         uint16_t i;
 318
 319         /* ignore externally allocated memory */
 320         msl = rte_mem_virt2memseg_list(addr);
 321         if (msl->external)
 322                 return;
 323
 324         pthread_mutex_lock(&dev->mutex);
 325
 326         if (dev->started == false)
 327                 goto exit;
 328
 329         /* Step 1: pause the active queues */
 330         for (i = 0; i < dev->queue_pairs; i++)
 331                 dev->ops->enable_qp(dev, i, 0);
 332
 333         /* Step 2: update memory regions */
 334         dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL);
 335
 336         /* Step 3: resume the active queues */
 337         for (i = 0; i < dev->queue_pairs; i++)
 338                 dev->ops->enable_qp(dev, i, 1);
 339
 340 exit:
 341         pthread_mutex_unlock(&dev->mutex);
 342 }
 343
 344 static int
 345 virtio_user_dev_setup(struct virtio_user_dev *dev)
 346 {
 347         uint32_t q;
 348
 349         dev->vhostfd = -1;
 350         dev->vhostfds = NULL;
 351         dev->tapfds = NULL;
 352
 353         if (dev->is_server) {
 354                 if (access(dev->path, F_OK) == 0 &&
 355                     !is_vhost_user_by_type(dev->path)) {
 356                         PMD_DRV_LOG(ERR, "Server mode doesn't support vhost-kernel!");
 357                         return -1;
 358                 }
 359                 dev->ops = &virtio_ops_user;
 360         } else {
 361                 if (is_vhost_user_by_type(dev->path)) {
 362                         dev->ops = &virtio_ops_user;
 363                 } else {
 364                         dev->ops = &virtio_ops_kernel;
 365
 366                         dev->vhostfds = malloc(dev->max_queue_pairs *
 367                                                sizeof(int));
 368                         dev->tapfds = malloc(dev->max_queue_pairs *
 369                                              sizeof(int));
 370                         if (!dev->vhostfds || !dev->tapfds) {
 371                                 PMD_INIT_LOG(ERR, "Failed to malloc");
 372                                 return -1;
 373                         }
 374
 375                         for (q = 0; q < dev->max_queue_pairs; ++q) {
 376                                 dev->vhostfds[q] = -1;
 377                                 dev->tapfds[q] = -1;
 378                         }
 379                 }
 380         }
 381
 382         if (dev->ops->setup(dev) < 0)
 383                 return -1;
 384
 385         if (virtio_user_dev_init_notify(dev) < 0)
 386                 return -1;
 387
 388         if (virtio_user_fill_intr_handle(dev) < 0)
 389                 return -1;
 390
 391         return 0;
 392 }
 393
 394 /* Use below macro to filter features from vhost backend */
 395 #define VIRTIO_USER_SUPPORTED_FEATURES                  \
 396         (1ULL << VIRTIO_NET_F_MAC               |       \
 397          1ULL << VIRTIO_NET_F_STATUS            |       \
 398          1ULL << VIRTIO_NET_F_MQ                |       \
 399          1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR     |       \
 400          1ULL << VIRTIO_NET_F_CTRL_VQ           |       \
 401          1ULL << VIRTIO_NET_F_CTRL_RX           |       \
 402          1ULL << VIRTIO_NET_F_CTRL_VLAN         |       \
 403          1ULL << VIRTIO_NET_F_CSUM              |       \
 404          1ULL << VIRTIO_NET_F_HOST_TSO4         |       \
 405          1ULL << VIRTIO_NET_F_HOST_TSO6         |       \
 406          1ULL << VIRTIO_NET_F_MRG_RXBUF         |       \
 407          1ULL << VIRTIO_RING_F_INDIRECT_DESC    |       \
 408          1ULL << VIRTIO_NET_F_GUEST_CSUM        |       \
 409          1ULL << VIRTIO_NET_F_GUEST_TSO4        |       \
 410          1ULL << VIRTIO_NET_F_GUEST_TSO6        |       \
 411          1ULL << VIRTIO_F_IN_ORDER              |       \
 412          1ULL << VIRTIO_F_VERSION_1             |       \
 413          1ULL << VIRTIO_F_RING_PACKED           |       \
 414          1ULL << VIRTIO_RING_F_EVENT_IDX)
 415
 416 int
 417 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
 418                      int cq, int queue_size, const char *mac, char **ifname,
 419                      int mrg_rxbuf, int in_order, int packed_vq)
 420 {
 421         pthread_mutex_init(&dev->mutex, NULL);
 422         snprintf(dev->path, PATH_MAX, "%s", path);
 423         dev->started = 0;
 424         dev->max_queue_pairs = queues;
 425         dev->queue_pairs = 1; /* mq disabled by default */
 426         dev->queue_size = queue_size;
 427         dev->mac_specified = 0;
 428         dev->frontend_features = 0;
 429         dev->unsupported_features = ~VIRTIO_USER_SUPPORTED_FEATURES;
 430         parse_mac(dev, mac);
 431
 432         if (*ifname) {
 433                 dev->ifname = *ifname;
 434                 *ifname = NULL;
 435         }
 436
 437         if (virtio_user_dev_setup(dev) < 0) {
 438                 PMD_INIT_LOG(ERR, "backend set up fails");
 439                 return -1;
 440         }
 441
 442         if (!dev->is_server) {
 443                 if (dev->ops->send_request(dev, VHOST_USER_SET_OWNER,
 444                                            NULL) < 0) {
 445                         PMD_INIT_LOG(ERR, "set_owner fails: %s",
 446                                      strerror(errno));
 447                         return -1;
 448                 }
 449
 450                 if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
 451                                            &dev->device_features) < 0) {
 452                         PMD_INIT_LOG(ERR, "get_features failed: %s",
 453                                      strerror(errno));
 454                         return -1;
 455                 }
 456         } else {
 457                 /* We just pretend vhost-user can support all these features.
 458                  * Note that this could be problematic that if some feature is
 459                  * negotiated but not supported by the vhost-user which comes
 460                  * later.
 461                  */
 462                 dev->device_features = VIRTIO_USER_SUPPORTED_FEATURES;
 463         }
 464
 465         if (!mrg_rxbuf)
 466                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MRG_RXBUF);
 467
 468         if (!in_order)
 469                 dev->unsupported_features |= (1ull << VIRTIO_F_IN_ORDER);
 470
 471         if (packed_vq) {
 472                 if (cq) {
 473                         PMD_INIT_LOG(ERR, "control vq not supported yet with "
 474                                           "packed virtqueues\n");
 475                         return -1;
 476                 }
 477                 dev->device_features |= (1ull << VIRTIO_F_RING_PACKED);
 478         } else {
 479                 dev->device_features &= ~(1ull << VIRTIO_F_RING_PACKED);
 480         }
 481
 482         if (dev->mac_specified) {
 483                 dev->device_features |= (1ull << VIRTIO_NET_F_MAC);
 484         } else {
 485                 dev->device_features &= ~(1ull << VIRTIO_NET_F_MAC);
 486                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MAC);
 487         }
 488
 489         if (cq) {
 490                 /* device does not really need to know anything about CQ,
 491                  * so if necessary, we just claim to support CQ
 492                  */
 493                 dev->frontend_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 494         } else {
 495                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 496                 /* Also disable features that depend on VIRTIO_NET_F_CTRL_VQ */
 497                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_RX);
 498                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VLAN);
 499                 dev->unsupported_features |=
 500                         (1ull << VIRTIO_NET_F_GUEST_ANNOUNCE);
 501                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MQ);
 502                 dev->unsupported_features |=
 503                         (1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
 504         }
 505
 506         /* The backend will not report this feature, we add it explicitly */
 507         if (is_vhost_user_by_type(dev->path))
 508                 dev->frontend_features |= (1ull << VIRTIO_NET_F_STATUS);
 509
 510         /*
 511          * Device features =
 512          *     (frontend_features | backend_features) & ~unsupported_features;
 513          */
 514         dev->device_features |= dev->frontend_features;
 515         dev->device_features &= ~dev->unsupported_features;
 516
 517         if (rte_mem_event_callback_register(VIRTIO_USER_MEM_EVENT_CLB_NAME,
 518                                 virtio_user_mem_event_cb, dev)) {
 519                 if (rte_errno != ENOTSUP) {
 520                         PMD_INIT_LOG(ERR, "Failed to register mem event"
 521                                         " callback\n");
 522                         return -1;
 523                 }
 524         }
 525
 526         return 0;
 527 }
 528
 529 void
 530 virtio_user_dev_uninit(struct virtio_user_dev *dev)
 531 {
 532         uint32_t i;
 533
 534         virtio_user_stop_device(dev);
 535
 536         rte_mem_event_callback_unregister(VIRTIO_USER_MEM_EVENT_CLB_NAME, dev);
 537
 538         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 539                 close(dev->callfds[i]);
 540                 close(dev->kickfds[i]);
 541         }
 542
 543         close(dev->vhostfd);
 544
 545         if (dev->is_server && dev->listenfd >= 0) {
 546                 close(dev->listenfd);
 547                 dev->listenfd = -1;
 548         }
 549
 550         if (dev->vhostfds) {
 551                 for (i = 0; i < dev->max_queue_pairs; ++i)
 552                         close(dev->vhostfds[i]);
 553                 free(dev->vhostfds);
 554                 free(dev->tapfds);
 555         }
 556
 557         free(dev->ifname);
 558
 559         if (dev->is_server)
 560                 unlink(dev->path);
 561 }
 562
 563 uint8_t
 564 virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs)
 565 {
 566         uint16_t i;
 567         uint8_t ret = 0;
 568
 569         if (q_pairs > dev->max_queue_pairs) {
 570                 PMD_INIT_LOG(ERR, "multi-q config %u, but only %u supported",
 571                              q_pairs, dev->max_queue_pairs);
 572                 return -1;
 573         }
 574
 575         /* Server mode can't enable queue pairs if vhostfd is invalid,
 576          * always return 0 in this case.
 577          */
 578         if (!dev->is_server || dev->vhostfd >= 0) {
 579                 for (i = 0; i < q_pairs; ++i)
 580                         ret |= dev->ops->enable_qp(dev, i, 1);
 581                 for (i = q_pairs; i < dev->max_queue_pairs; ++i)
 582                         ret |= dev->ops->enable_qp(dev, i, 0);
 583         }
 584         dev->queue_pairs = q_pairs;
 585
 586         return ret;
 587 }
 588
 589 static uint32_t
 590 virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring,
 591                             uint16_t idx_hdr)
 592 {
 593         struct virtio_net_ctrl_hdr *hdr;
 594         virtio_net_ctrl_ack status = ~0;
 595         uint16_t i, idx_data, idx_status;
 596         uint32_t n_descs = 0;
 597
 598         /* locate desc for header, data, and status */
 599         idx_data = vring->desc[idx_hdr].next;
 600         n_descs++;
 601
 602         i = idx_data;
 603         while (vring->desc[i].flags == VRING_DESC_F_NEXT) {
 604                 i = vring->desc[i].next;
 605                 n_descs++;
 606         }
 607
 608         /* locate desc for status */
 609         idx_status = i;
 610         n_descs++;
 611
 612         hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
 613         if (hdr->class == VIRTIO_NET_CTRL_MQ &&
 614             hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
 615                 uint16_t queues;
 616
 617                 queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr;
 618                 status = virtio_user_handle_mq(dev, queues);
 619         }
 620
 621         /* Update status */
 622         *(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status;
 623
 624         return n_descs;
 625 }
 626
 627 void
 628 virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
 629 {
 630         uint16_t avail_idx, desc_idx;
 631         struct vring_used_elem *uep;
 632         uint32_t n_descs;
 633         struct vring *vring = &dev->vrings[queue_idx];
 634
 635         /* Consume avail ring, using used ring idx as first one */
 636         while (vring->used->idx != vring->avail->idx) {
 637                 avail_idx = (vring->used->idx) & (vring->num - 1);
 638                 desc_idx = vring->avail->ring[avail_idx];
 639
 640                 n_descs = virtio_user_handle_ctrl_msg(dev, vring, desc_idx);
 641
 642                 /* Update used ring */
 643                 uep = &vring->used->ring[avail_idx];
 644                 uep->id = avail_idx;
 645                 uep->len = n_descs;
 646
 647                 vring->used->idx++;
 648         }
 649 }