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_string_fns.h>
  17 #include <rte_eal_memconfig.h>
  18
  19 #include "vhost.h"
  20 #include "virtio_user_dev.h"
  21 #include "../virtio_ethdev.h"
  22
  23 #define VIRTIO_USER_MEM_EVENT_CLB_NAME "virtio_user_mem_event_clb"
  24
  25 const char * const virtio_user_backend_strings[] = {
  26         [VIRTIO_USER_BACKEND_UNKNOWN] = "VIRTIO_USER_BACKEND_UNKNOWN",
  27         [VIRTIO_USER_BACKEND_VHOST_USER] = "VHOST_USER",
  28         [VIRTIO_USER_BACKEND_VHOST_KERNEL] = "VHOST_NET",
  29         [VIRTIO_USER_BACKEND_VHOST_VDPA] = "VHOST_VDPA",
  30 };
  31
  32 static int
  33 virtio_user_create_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  34 {
  35         /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come
  36          * firstly because vhost depends on this msg to allocate virtqueue
  37          * pair.
  38          */
  39         struct vhost_vring_file file;
  40
  41         file.index = queue_sel;
  42         file.fd = dev->callfds[queue_sel];
  43         dev->ops->send_request(dev, VHOST_USER_SET_VRING_CALL, &file);
  44
  45         return 0;
  46 }
  47
  48 static int
  49 virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  50 {
  51         struct vhost_vring_file file;
  52         struct vhost_vring_state state;
  53         struct vring *vring = &dev->vrings[queue_sel];
  54         struct vring_packed *pq_vring = &dev->packed_vrings[queue_sel];
  55         struct vhost_vring_addr addr = {
  56                 .index = queue_sel,
  57                 .log_guest_addr = 0,
  58                 .flags = 0, /* disable log */
  59         };
  60
  61         if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) {
  62                 addr.desc_user_addr =
  63                         (uint64_t)(uintptr_t)pq_vring->desc;
  64                 addr.avail_user_addr =
  65                         (uint64_t)(uintptr_t)pq_vring->driver;
  66                 addr.used_user_addr =
  67                         (uint64_t)(uintptr_t)pq_vring->device;
  68         } else {
  69                 addr.desc_user_addr = (uint64_t)(uintptr_t)vring->desc;
  70                 addr.avail_user_addr = (uint64_t)(uintptr_t)vring->avail;
  71                 addr.used_user_addr = (uint64_t)(uintptr_t)vring->used;
  72         }
  73
  74         state.index = queue_sel;
  75         state.num = vring->num;
  76         dev->ops->send_request(dev, VHOST_USER_SET_VRING_NUM, &state);
  77
  78         state.index = queue_sel;
  79         state.num = 0; /* no reservation */
  80         if (dev->features & (1ULL << VIRTIO_F_RING_PACKED))
  81                 state.num |= (1 << 15);
  82         dev->ops->send_request(dev, VHOST_USER_SET_VRING_BASE, &state);
  83
  84         dev->ops->send_request(dev, VHOST_USER_SET_VRING_ADDR, &addr);
  85
  86         /* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
  87          * lastly because vhost depends on this msg to judge if
  88          * virtio is ready.
  89          */
  90         file.index = queue_sel;
  91         file.fd = dev->kickfds[queue_sel];
  92         dev->ops->send_request(dev, VHOST_USER_SET_VRING_KICK, &file);
  93
  94         return 0;
  95 }
  96
  97 static int
  98 virtio_user_queue_setup(struct virtio_user_dev *dev,
  99                         int (*fn)(struct virtio_user_dev *, uint32_t))
 100 {
 101         uint32_t i, queue_sel;
 102
 103         for (i = 0; i < dev->max_queue_pairs; ++i) {
 104                 queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX;
 105                 if (fn(dev, queue_sel) < 0) {
 106                         PMD_DRV_LOG(INFO, "setup rx vq fails: %u", i);
 107                         return -1;
 108                 }
 109         }
 110         for (i = 0; i < dev->max_queue_pairs; ++i) {
 111                 queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX;
 112                 if (fn(dev, queue_sel) < 0) {
 113                         PMD_DRV_LOG(INFO, "setup tx vq fails: %u", i);
 114                         return -1;
 115                 }
 116         }
 117
 118         return 0;
 119 }
 120
 121 int
 122 virtio_user_dev_set_features(struct virtio_user_dev *dev)
 123 {
 124         uint64_t features;
 125         int ret = -1;
 126
 127         pthread_mutex_lock(&dev->mutex);
 128
 129         if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER &&
 130                         dev->vhostfd < 0)
 131                 goto error;
 132
 133         /* Step 0: tell vhost to create queues */
 134         if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
 135                 goto error;
 136
 137         features = dev->features;
 138
 139         /* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */
 140         features &= ~(1ull << VIRTIO_NET_F_MAC);
 141         /* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
 142         features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
 143         features &= ~(1ull << VIRTIO_NET_F_STATUS);
 144         ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
 145         if (ret < 0)
 146                 goto error;
 147         PMD_DRV_LOG(INFO, "set features: %" PRIx64, features);
 148 error:
 149         pthread_mutex_unlock(&dev->mutex);
 150
 151         return ret;
 152 }
 153
 154 int
 155 virtio_user_start_device(struct virtio_user_dev *dev)
 156 {
 157         int ret;
 158
 159         /*
 160          * XXX workaround!
 161          *
 162          * We need to make sure that the locks will be
 163          * taken in the correct order to avoid deadlocks.
 164          *
 165          * Before releasing this lock, this thread should
 166          * not trigger any memory hotplug events.
 167          *
 168          * This is a temporary workaround, and should be
 169          * replaced when we get proper supports from the
 170          * memory subsystem in the future.
 171          */
 172         rte_mcfg_mem_read_lock();
 173         pthread_mutex_lock(&dev->mutex);
 174
 175         if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER &&
 176                         dev->vhostfd < 0)
 177                 goto error;
 178
 179         /* Step 2: share memory regions */
 180         ret = dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL);
 181         if (ret < 0)
 182                 goto error;
 183
 184         /* Step 3: kick queues */
 185         if (virtio_user_queue_setup(dev, virtio_user_kick_queue) < 0)
 186                 goto error;
 187
 188         /* Step 4: enable queues
 189          * we enable the 1st queue pair by default.
 190          */
 191         dev->ops->enable_qp(dev, 0, 1);
 192
 193         dev->started = true;
 194         pthread_mutex_unlock(&dev->mutex);
 195         rte_mcfg_mem_read_unlock();
 196
 197         return 0;
 198 error:
 199         pthread_mutex_unlock(&dev->mutex);
 200         rte_mcfg_mem_read_unlock();
 201         /* TODO: free resource here or caller to check */
 202         return -1;
 203 }
 204
 205 int virtio_user_stop_device(struct virtio_user_dev *dev)
 206 {
 207         struct vhost_vring_state state;
 208         uint32_t i;
 209         int error = 0;
 210
 211         pthread_mutex_lock(&dev->mutex);
 212         if (!dev->started)
 213                 goto out;
 214
 215         for (i = 0; i < dev->max_queue_pairs; ++i)
 216                 dev->ops->enable_qp(dev, i, 0);
 217
 218         /* Stop the backend. */
 219         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 220                 state.index = i;
 221                 if (dev->ops->send_request(dev, VHOST_USER_GET_VRING_BASE,
 222                                            &state) < 0) {
 223                         PMD_DRV_LOG(ERR, "get_vring_base failed, index=%u\n",
 224                                     i);
 225                         error = -1;
 226                         goto out;
 227                 }
 228         }
 229
 230         dev->started = false;
 231 out:
 232         pthread_mutex_unlock(&dev->mutex);
 233
 234         return error;
 235 }
 236
 237 static inline void
 238 parse_mac(struct virtio_user_dev *dev, const char *mac)
 239 {
 240         struct rte_ether_addr tmp;
 241
 242         if (!mac)
 243                 return;
 244
 245         if (rte_ether_unformat_addr(mac, &tmp) == 0) {
 246                 memcpy(dev->mac_addr, &tmp, RTE_ETHER_ADDR_LEN);
 247                 dev->mac_specified = 1;
 248         } else {
 249                 /* ignore the wrong mac, use random mac */
 250                 PMD_DRV_LOG(ERR, "wrong format of mac: %s", mac);
 251         }
 252 }
 253
 254 static int
 255 virtio_user_dev_init_notify(struct virtio_user_dev *dev)
 256 {
 257         uint32_t i, j;
 258         int callfd;
 259         int kickfd;
 260
 261         for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; ++i) {
 262                 if (i >= dev->max_queue_pairs * 2) {
 263                         dev->kickfds[i] = -1;
 264                         dev->callfds[i] = -1;
 265                         continue;
 266                 }
 267
 268                 /* May use invalid flag, but some backend uses kickfd and
 269                  * callfd as criteria to judge if dev is alive. so finally we
 270                  * use real event_fd.
 271                  */
 272                 callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 273                 if (callfd < 0) {
 274                         PMD_DRV_LOG(ERR, "callfd error, %s", strerror(errno));
 275                         break;
 276                 }
 277                 kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 278                 if (kickfd < 0) {
 279                         PMD_DRV_LOG(ERR, "kickfd error, %s", strerror(errno));
 280                         break;
 281                 }
 282                 dev->callfds[i] = callfd;
 283                 dev->kickfds[i] = kickfd;
 284         }
 285
 286         if (i < VIRTIO_MAX_VIRTQUEUES) {
 287                 for (j = 0; j <= i; ++j) {
 288                         close(dev->callfds[j]);
 289                         close(dev->kickfds[j]);
 290                 }
 291
 292                 return -1;
 293         }
 294
 295         return 0;
 296 }
 297
 298 static int
 299 virtio_user_fill_intr_handle(struct virtio_user_dev *dev)
 300 {
 301         uint32_t i;
 302         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
 303
 304         if (!eth_dev->intr_handle) {
 305                 eth_dev->intr_handle = malloc(sizeof(*eth_dev->intr_handle));
 306                 if (!eth_dev->intr_handle) {
 307                         PMD_DRV_LOG(ERR, "fail to allocate intr_handle");
 308                         return -1;
 309                 }
 310                 memset(eth_dev->intr_handle, 0, sizeof(*eth_dev->intr_handle));
 311         }
 312
 313         for (i = 0; i < dev->max_queue_pairs; ++i)
 314                 eth_dev->intr_handle->efds[i] = dev->callfds[i];
 315         eth_dev->intr_handle->nb_efd = dev->max_queue_pairs;
 316         eth_dev->intr_handle->max_intr = dev->max_queue_pairs + 1;
 317         eth_dev->intr_handle->type = RTE_INTR_HANDLE_VDEV;
 318         /* For virtio vdev, no need to read counter for clean */
 319         eth_dev->intr_handle->efd_counter_size = 0;
 320         eth_dev->intr_handle->fd = -1;
 321         if (dev->vhostfd >= 0)
 322                 eth_dev->intr_handle->fd = dev->vhostfd;
 323         else if (dev->is_server)
 324                 eth_dev->intr_handle->fd = dev->listenfd;
 325
 326         return 0;
 327 }
 328
 329 static void
 330 virtio_user_mem_event_cb(enum rte_mem_event type __rte_unused,
 331                          const void *addr,
 332                          size_t len __rte_unused,
 333                          void *arg)
 334 {
 335         struct virtio_user_dev *dev = arg;
 336         struct rte_memseg_list *msl;
 337         uint16_t i;
 338
 339         /* ignore externally allocated memory */
 340         msl = rte_mem_virt2memseg_list(addr);
 341         if (msl->external)
 342                 return;
 343
 344         pthread_mutex_lock(&dev->mutex);
 345
 346         if (dev->started == false)
 347                 goto exit;
 348
 349         /* Step 1: pause the active queues */
 350         for (i = 0; i < dev->queue_pairs; i++)
 351                 dev->ops->enable_qp(dev, i, 0);
 352
 353         /* Step 2: update memory regions */
 354         dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL);
 355
 356         /* Step 3: resume the active queues */
 357         for (i = 0; i < dev->queue_pairs; i++)
 358                 dev->ops->enable_qp(dev, i, 1);
 359
 360 exit:
 361         pthread_mutex_unlock(&dev->mutex);
 362 }
 363
 364 static int
 365 virtio_user_dev_setup(struct virtio_user_dev *dev)
 366 {
 367         uint32_t q;
 368
 369         dev->vhostfd = -1;
 370         dev->vhostfds = NULL;
 371         dev->tapfds = NULL;
 372
 373         if (dev->is_server) {
 374                 if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER) {
 375                         PMD_DRV_LOG(ERR, "Server mode only supports vhost-user!");
 376                         return -1;
 377                 }
 378                 dev->ops = &virtio_ops_user;
 379         } else {
 380                 if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER) {
 381                         dev->ops = &virtio_ops_user;
 382                 } else if (dev->backend_type ==
 383                                         VIRTIO_USER_BACKEND_VHOST_KERNEL) {
 384                         dev->ops = &virtio_ops_kernel;
 385
 386                         dev->vhostfds = malloc(dev->max_queue_pairs *
 387                                                sizeof(int));
 388                         dev->tapfds = malloc(dev->max_queue_pairs *
 389                                              sizeof(int));
 390                         if (!dev->vhostfds || !dev->tapfds) {
 391                                 PMD_INIT_LOG(ERR, "Failed to malloc");
 392                                 return -1;
 393                         }
 394
 395                         for (q = 0; q < dev->max_queue_pairs; ++q) {
 396                                 dev->vhostfds[q] = -1;
 397                                 dev->tapfds[q] = -1;
 398                         }
 399                 } else if (dev->backend_type ==
 400                                 VIRTIO_USER_BACKEND_VHOST_VDPA) {
 401                         dev->ops = &virtio_ops_vdpa;
 402                 } else {
 403                         PMD_DRV_LOG(ERR, "Unknown backend type");
 404                         return -1;
 405                 }
 406         }
 407
 408         if (dev->ops->setup(dev) < 0)
 409                 return -1;
 410
 411         if (virtio_user_dev_init_notify(dev) < 0)
 412                 return -1;
 413
 414         if (virtio_user_fill_intr_handle(dev) < 0)
 415                 return -1;
 416
 417         return 0;
 418 }
 419
 420 /* Use below macro to filter features from vhost backend */
 421 #define VIRTIO_USER_SUPPORTED_FEATURES                  \
 422         (1ULL << VIRTIO_NET_F_MAC               |       \
 423          1ULL << VIRTIO_NET_F_STATUS            |       \
 424          1ULL << VIRTIO_NET_F_MQ                |       \
 425          1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR     |       \
 426          1ULL << VIRTIO_NET_F_CTRL_VQ           |       \
 427          1ULL << VIRTIO_NET_F_CTRL_RX           |       \
 428          1ULL << VIRTIO_NET_F_CTRL_VLAN         |       \
 429          1ULL << VIRTIO_NET_F_CSUM              |       \
 430          1ULL << VIRTIO_NET_F_HOST_TSO4         |       \
 431          1ULL << VIRTIO_NET_F_HOST_TSO6         |       \
 432          1ULL << VIRTIO_NET_F_MRG_RXBUF         |       \
 433          1ULL << VIRTIO_RING_F_INDIRECT_DESC    |       \
 434          1ULL << VIRTIO_NET_F_GUEST_CSUM        |       \
 435          1ULL << VIRTIO_NET_F_GUEST_TSO4        |       \
 436          1ULL << VIRTIO_NET_F_GUEST_TSO6        |       \
 437          1ULL << VIRTIO_F_IN_ORDER              |       \
 438          1ULL << VIRTIO_F_VERSION_1             |       \
 439          1ULL << VIRTIO_F_RING_PACKED           |       \
 440          1ULL << VHOST_USER_F_PROTOCOL_FEATURES)
 441
 442 #define VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES         \
 443         (1ULL << VHOST_USER_PROTOCOL_F_MQ |             \
 444          1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK |      \
 445          1ULL << VHOST_USER_PROTOCOL_F_STATUS)
 446
 447 int
 448 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
 449                      int cq, int queue_size, const char *mac, char **ifname,
 450                      int server, int mrg_rxbuf, int in_order, int packed_vq,
 451                      enum virtio_user_backend_type backend_type)
 452 {
 453         uint64_t protocol_features = 0;
 454
 455         pthread_mutex_init(&dev->mutex, NULL);
 456         strlcpy(dev->path, path, PATH_MAX);
 457         dev->started = 0;
 458         dev->max_queue_pairs = queues;
 459         dev->queue_pairs = 1; /* mq disabled by default */
 460         dev->queue_size = queue_size;
 461         dev->is_server = server;
 462         dev->mac_specified = 0;
 463         dev->frontend_features = 0;
 464         dev->unsupported_features = ~VIRTIO_USER_SUPPORTED_FEATURES;
 465         dev->protocol_features = VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES;
 466         dev->backend_type = backend_type;
 467
 468         parse_mac(dev, mac);
 469
 470         if (*ifname) {
 471                 dev->ifname = *ifname;
 472                 *ifname = NULL;
 473         }
 474
 475         if (virtio_user_dev_setup(dev) < 0) {
 476                 PMD_INIT_LOG(ERR, "backend set up fails");
 477                 return -1;
 478         }
 479
 480         if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER)
 481                 dev->unsupported_features |=
 482                         (1ULL << VHOST_USER_F_PROTOCOL_FEATURES);
 483
 484         if (!dev->is_server) {
 485                 if (dev->ops->send_request(dev, VHOST_USER_SET_OWNER,
 486                                            NULL) < 0) {
 487                         PMD_INIT_LOG(ERR, "set_owner fails: %s",
 488                                      strerror(errno));
 489                         return -1;
 490                 }
 491
 492                 if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
 493                                            &dev->device_features) < 0) {
 494                         PMD_INIT_LOG(ERR, "get_features failed: %s",
 495                                      strerror(errno));
 496                         return -1;
 497                 }
 498
 499
 500                 if (dev->device_features &
 501                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) {
 502                         if (dev->ops->send_request(dev,
 503                                         VHOST_USER_GET_PROTOCOL_FEATURES,
 504                                         &protocol_features))
 505                                 return -1;
 506
 507                         dev->protocol_features &= protocol_features;
 508
 509                         if (dev->ops->send_request(dev,
 510                                         VHOST_USER_SET_PROTOCOL_FEATURES,
 511                                         &dev->protocol_features))
 512                                 return -1;
 513
 514                         if (!(dev->protocol_features &
 515                                         (1ULL << VHOST_USER_PROTOCOL_F_MQ)))
 516                                 dev->unsupported_features |=
 517                                         (1ull << VIRTIO_NET_F_MQ);
 518                 }
 519         } else {
 520                 /* We just pretend vhost-user can support all these features.
 521                  * Note that this could be problematic that if some feature is
 522                  * negotiated but not supported by the vhost-user which comes
 523                  * later.
 524                  */
 525                 dev->device_features = VIRTIO_USER_SUPPORTED_FEATURES;
 526         }
 527
 528
 529
 530         if (!mrg_rxbuf)
 531                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MRG_RXBUF);
 532
 533         if (!in_order)
 534                 dev->unsupported_features |= (1ull << VIRTIO_F_IN_ORDER);
 535
 536         if (!packed_vq)
 537                 dev->unsupported_features |= (1ull << VIRTIO_F_RING_PACKED);
 538
 539         if (dev->mac_specified)
 540                 dev->frontend_features |= (1ull << VIRTIO_NET_F_MAC);
 541         else
 542                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MAC);
 543
 544         if (cq) {
 545                 /* device does not really need to know anything about CQ,
 546                  * so if necessary, we just claim to support CQ
 547                  */
 548                 dev->frontend_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 549         } else {
 550                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 551                 /* Also disable features that depend on VIRTIO_NET_F_CTRL_VQ */
 552                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_RX);
 553                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VLAN);
 554                 dev->unsupported_features |=
 555                         (1ull << VIRTIO_NET_F_GUEST_ANNOUNCE);
 556                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MQ);
 557                 dev->unsupported_features |=
 558                         (1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
 559         }
 560
 561         /* The backend will not report this feature, we add it explicitly */
 562         if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER)
 563                 dev->frontend_features |= (1ull << VIRTIO_NET_F_STATUS);
 564
 565         /*
 566          * Device features =
 567          *     (frontend_features | backend_features) & ~unsupported_features;
 568          */
 569         dev->device_features |= dev->frontend_features;
 570         dev->device_features &= ~dev->unsupported_features;
 571
 572         if (rte_mem_event_callback_register(VIRTIO_USER_MEM_EVENT_CLB_NAME,
 573                                 virtio_user_mem_event_cb, dev)) {
 574                 if (rte_errno != ENOTSUP) {
 575                         PMD_INIT_LOG(ERR, "Failed to register mem event"
 576                                         " callback\n");
 577                         return -1;
 578                 }
 579         }
 580
 581         return 0;
 582 }
 583
 584 void
 585 virtio_user_dev_uninit(struct virtio_user_dev *dev)
 586 {
 587         uint32_t i;
 588
 589         virtio_user_stop_device(dev);
 590
 591         rte_mem_event_callback_unregister(VIRTIO_USER_MEM_EVENT_CLB_NAME, dev);
 592
 593         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 594                 close(dev->callfds[i]);
 595                 close(dev->kickfds[i]);
 596         }
 597
 598         if (dev->vhostfd >= 0)
 599                 close(dev->vhostfd);
 600
 601         if (dev->is_server && dev->listenfd >= 0) {
 602                 close(dev->listenfd);
 603                 dev->listenfd = -1;
 604         }
 605
 606         if (dev->vhostfds) {
 607                 for (i = 0; i < dev->max_queue_pairs; ++i) {
 608                         close(dev->vhostfds[i]);
 609                         if (dev->tapfds[i] >= 0)
 610                                 close(dev->tapfds[i]);
 611                 }
 612                 free(dev->vhostfds);
 613                 free(dev->tapfds);
 614         }
 615
 616         free(dev->ifname);
 617
 618         if (dev->is_server)
 619                 unlink(dev->path);
 620 }
 621
 622 uint8_t
 623 virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs)
 624 {
 625         uint16_t i;
 626         uint8_t ret = 0;
 627
 628         if (q_pairs > dev->max_queue_pairs) {
 629                 PMD_INIT_LOG(ERR, "multi-q config %u, but only %u supported",
 630                              q_pairs, dev->max_queue_pairs);
 631                 return -1;
 632         }
 633
 634         /* Server mode can't enable queue pairs if vhostfd is invalid,
 635          * always return 0 in this case.
 636          */
 637         if (!dev->is_server || dev->vhostfd >= 0) {
 638                 for (i = 0; i < q_pairs; ++i)
 639                         ret |= dev->ops->enable_qp(dev, i, 1);
 640                 for (i = q_pairs; i < dev->max_queue_pairs; ++i)
 641                         ret |= dev->ops->enable_qp(dev, i, 0);
 642         }
 643         dev->queue_pairs = q_pairs;
 644
 645         return ret;
 646 }
 647
 648 static uint32_t
 649 virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring,
 650                             uint16_t idx_hdr)
 651 {
 652         struct virtio_net_ctrl_hdr *hdr;
 653         virtio_net_ctrl_ack status = ~0;
 654         uint16_t i, idx_data, idx_status;
 655         uint32_t n_descs = 0;
 656
 657         /* locate desc for header, data, and status */
 658         idx_data = vring->desc[idx_hdr].next;
 659         n_descs++;
 660
 661         i = idx_data;
 662         while (vring->desc[i].flags == VRING_DESC_F_NEXT) {
 663                 i = vring->desc[i].next;
 664                 n_descs++;
 665         }
 666
 667         /* locate desc for status */
 668         idx_status = i;
 669         n_descs++;
 670
 671         hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
 672         if (hdr->class == VIRTIO_NET_CTRL_MQ &&
 673             hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
 674                 uint16_t queues;
 675
 676                 queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr;
 677                 status = virtio_user_handle_mq(dev, queues);
 678         } else if (hdr->class == VIRTIO_NET_CTRL_RX  ||
 679                    hdr->class == VIRTIO_NET_CTRL_MAC ||
 680                    hdr->class == VIRTIO_NET_CTRL_VLAN) {
 681                 status = 0;
 682         }
 683
 684         /* Update status */
 685         *(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status;
 686
 687         return n_descs;
 688 }
 689
 690 static inline int
 691 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
 692 {
 693         uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
 694
 695         return wrap_counter == !!(flags & VRING_PACKED_DESC_F_AVAIL) &&
 696                 wrap_counter != !!(flags & VRING_PACKED_DESC_F_USED);
 697 }
 698
 699 static uint32_t
 700 virtio_user_handle_ctrl_msg_packed(struct virtio_user_dev *dev,
 701                                    struct vring_packed *vring,
 702                                    uint16_t idx_hdr)
 703 {
 704         struct virtio_net_ctrl_hdr *hdr;
 705         virtio_net_ctrl_ack status = ~0;
 706         uint16_t idx_data, idx_status;
 707         /* initialize to one, header is first */
 708         uint32_t n_descs = 1;
 709
 710         /* locate desc for header, data, and status */
 711         idx_data = idx_hdr + 1;
 712         if (idx_data >= dev->queue_size)
 713                 idx_data -= dev->queue_size;
 714
 715         n_descs++;
 716
 717         idx_status = idx_data;
 718         while (vring->desc[idx_status].flags & VRING_DESC_F_NEXT) {
 719                 idx_status++;
 720                 if (idx_status >= dev->queue_size)
 721                         idx_status -= dev->queue_size;
 722                 n_descs++;
 723         }
 724
 725         hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
 726         if (hdr->class == VIRTIO_NET_CTRL_MQ &&
 727             hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
 728                 uint16_t queues;
 729
 730                 queues = *(uint16_t *)(uintptr_t)
 731                                 vring->desc[idx_data].addr;
 732                 status = virtio_user_handle_mq(dev, queues);
 733         } else if (hdr->class == VIRTIO_NET_CTRL_RX  ||
 734                    hdr->class == VIRTIO_NET_CTRL_MAC ||
 735                    hdr->class == VIRTIO_NET_CTRL_VLAN) {
 736                 status = 0;
 737         }
 738
 739         /* Update status */
 740         *(virtio_net_ctrl_ack *)(uintptr_t)
 741                 vring->desc[idx_status].addr = status;
 742
 743         /* Update used descriptor */
 744         vring->desc[idx_hdr].id = vring->desc[idx_status].id;
 745         vring->desc[idx_hdr].len = sizeof(status);
 746
 747         return n_descs;
 748 }
 749
 750 void
 751 virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx)
 752 {
 753         struct virtio_user_queue *vq = &dev->packed_queues[queue_idx];
 754         struct vring_packed *vring = &dev->packed_vrings[queue_idx];
 755         uint16_t n_descs, flags;
 756
 757         /* Perform a load-acquire barrier in desc_is_avail to
 758          * enforce the ordering between desc flags and desc
 759          * content.
 760          */
 761         while (desc_is_avail(&vring->desc[vq->used_idx],
 762                              vq->used_wrap_counter)) {
 763
 764                 n_descs = virtio_user_handle_ctrl_msg_packed(dev, vring,
 765                                 vq->used_idx);
 766
 767                 flags = VRING_DESC_F_WRITE;
 768                 if (vq->used_wrap_counter)
 769                         flags |= VRING_PACKED_DESC_F_AVAIL_USED;
 770
 771                 __atomic_store_n(&vring->desc[vq->used_idx].flags, flags,
 772                                  __ATOMIC_RELEASE);
 773
 774                 vq->used_idx += n_descs;
 775                 if (vq->used_idx >= dev->queue_size) {
 776                         vq->used_idx -= dev->queue_size;
 777                         vq->used_wrap_counter ^= 1;
 778                 }
 779         }
 780 }
 781
 782 void
 783 virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
 784 {
 785         uint16_t avail_idx, desc_idx;
 786         struct vring_used_elem *uep;
 787         uint32_t n_descs;
 788         struct vring *vring = &dev->vrings[queue_idx];
 789
 790         /* Consume avail ring, using used ring idx as first one */
 791         while (__atomic_load_n(&vring->used->idx, __ATOMIC_RELAXED)
 792                != vring->avail->idx) {
 793                 avail_idx = __atomic_load_n(&vring->used->idx, __ATOMIC_RELAXED)
 794                             & (vring->num - 1);
 795                 desc_idx = vring->avail->ring[avail_idx];
 796
 797                 n_descs = virtio_user_handle_ctrl_msg(dev, vring, desc_idx);
 798
 799                 /* Update used ring */
 800                 uep = &vring->used->ring[avail_idx];
 801                 uep->id = desc_idx;
 802                 uep->len = n_descs;
 803
 804                 __atomic_add_fetch(&vring->used->idx, 1, __ATOMIC_RELAXED);
 805         }
 806 }
 807
 808 int
 809 virtio_user_send_status_update(struct virtio_user_dev *dev, uint8_t status)
 810 {
 811         int ret;
 812         uint64_t arg = status;
 813
 814         if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER)
 815                 ret = dev->ops->send_request(dev,
 816                                 VHOST_USER_SET_STATUS, &arg);
 817         else if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_VDPA)
 818                 ret = dev->ops->send_request(dev,
 819                                 VHOST_USER_SET_STATUS, &status);
 820         else
 821                 return 0;
 822
 823         if (ret) {
 824                 PMD_INIT_LOG(ERR, "VHOST_USER_SET_STATUS failed (%d): %s", ret,
 825                              strerror(errno));
 826                 return -1;
 827         }
 828
 829         return 0;
 830 }
 831
 832 int
 833 virtio_user_update_status(struct virtio_user_dev *dev)
 834 {
 835         uint64_t ret;
 836         uint8_t status;
 837         int err;
 838
 839         if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER) {
 840                 err = dev->ops->send_request(dev, VHOST_USER_GET_STATUS, &ret);
 841                 if (!err && ret > UINT8_MAX) {
 842                         PMD_INIT_LOG(ERR, "Invalid VHOST_USER_GET_STATUS "
 843                                         "response 0x%" PRIx64 "\n", ret);
 844                         return -1;
 845                 }
 846
 847                 status = ret;
 848         } else if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_VDPA) {
 849                 err = dev->ops->send_request(dev, VHOST_USER_GET_STATUS,
 850                                 &status);
 851         } else {
 852                 return 0;
 853         }
 854
 855         if (err) {
 856                 PMD_INIT_LOG(ERR, "VHOST_USER_GET_STATUS failed (%d): %s", err,
 857                              strerror(errno));
 858                 return -1;
 859         }
 860
 861         dev->status = status;
 862         PMD_INIT_LOG(DEBUG, "Updated Device Status(0x%08x):\n"
 863                         "\t-RESET: %u\n"
 864                         "\t-ACKNOWLEDGE: %u\n"
 865                         "\t-DRIVER: %u\n"
 866                         "\t-DRIVER_OK: %u\n"
 867                         "\t-FEATURES_OK: %u\n"
 868                         "\t-DEVICE_NEED_RESET: %u\n"
 869                         "\t-FAILED: %u\n",
 870                         dev->status,
 871                         (dev->status == VIRTIO_CONFIG_STATUS_RESET),
 872                         !!(dev->status & VIRTIO_CONFIG_STATUS_ACK),
 873                         !!(dev->status & VIRTIO_CONFIG_STATUS_DRIVER),
 874                         !!(dev->status & VIRTIO_CONFIG_STATUS_DRIVER_OK),
 875                         !!(dev->status & VIRTIO_CONFIG_STATUS_FEATURES_OK),
 876                         !!(dev->status & VIRTIO_CONFIG_STATUS_DEV_NEED_RESET),
 877                         !!(dev->status & VIRTIO_CONFIG_STATUS_FAILED));
 878         return 0;
 879 }