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         int ret;
  41
  42         file.index = queue_sel;
  43         file.fd = dev->callfds[queue_sel];
  44         ret = dev->ops->set_vring_call(dev, &file);
  45         if (ret < 0) {
  46                 PMD_INIT_LOG(ERR, "(%s) Failed to create queue %u\n", dev->path, queue_sel);
  47                 return -1;
  48         }
  49
  50         return 0;
  51 }
  52
  53 static int
  54 virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  55 {
  56         int ret;
  57         struct vhost_vring_file file;
  58         struct vhost_vring_state state;
  59         struct vring *vring = &dev->vrings[queue_sel];
  60         struct vring_packed *pq_vring = &dev->packed_vrings[queue_sel];
  61         struct vhost_vring_addr addr = {
  62                 .index = queue_sel,
  63                 .log_guest_addr = 0,
  64                 .flags = 0, /* disable log */
  65         };
  66
  67         if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) {
  68                 addr.desc_user_addr =
  69                         (uint64_t)(uintptr_t)pq_vring->desc;
  70                 addr.avail_user_addr =
  71                         (uint64_t)(uintptr_t)pq_vring->driver;
  72                 addr.used_user_addr =
  73                         (uint64_t)(uintptr_t)pq_vring->device;
  74         } else {
  75                 addr.desc_user_addr = (uint64_t)(uintptr_t)vring->desc;
  76                 addr.avail_user_addr = (uint64_t)(uintptr_t)vring->avail;
  77                 addr.used_user_addr = (uint64_t)(uintptr_t)vring->used;
  78         }
  79
  80         state.index = queue_sel;
  81         state.num = vring->num;
  82         ret = dev->ops->set_vring_num(dev, &state);
  83         if (ret < 0)
  84                 goto err;
  85
  86         state.index = queue_sel;
  87         state.num = 0; /* no reservation */
  88         if (dev->features & (1ULL << VIRTIO_F_RING_PACKED))
  89                 state.num |= (1 << 15);
  90         ret = dev->ops->set_vring_base(dev, &state);
  91         if (ret < 0)
  92                 goto err;
  93
  94         ret = dev->ops->set_vring_addr(dev, &addr);
  95         if (ret < 0)
  96                 goto err;
  97
  98         /* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
  99          * lastly because vhost depends on this msg to judge if
 100          * virtio is ready.
 101          */
 102         file.index = queue_sel;
 103         file.fd = dev->kickfds[queue_sel];
 104         ret = dev->ops->set_vring_kick(dev, &file);
 105         if (ret < 0)
 106                 goto err;
 107
 108         return 0;
 109 err:
 110         PMD_INIT_LOG(ERR, "(%s) Failed to kick queue %u\n", dev->path, queue_sel);
 111
 112         return -1;
 113 }
 114
 115 static int
 116 virtio_user_queue_setup(struct virtio_user_dev *dev,
 117                         int (*fn)(struct virtio_user_dev *, uint32_t))
 118 {
 119         uint32_t i, queue_sel;
 120
 121         for (i = 0; i < dev->max_queue_pairs; ++i) {
 122                 queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX;
 123                 if (fn(dev, queue_sel) < 0) {
 124                         PMD_DRV_LOG(ERR, "(%s) setup rx vq %u failed", dev->path, i);
 125                         return -1;
 126                 }
 127         }
 128         for (i = 0; i < dev->max_queue_pairs; ++i) {
 129                 queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX;
 130                 if (fn(dev, queue_sel) < 0) {
 131                         PMD_DRV_LOG(INFO, "(%s) setup tx vq %u failed", dev->path, i);
 132                         return -1;
 133                 }
 134         }
 135
 136         return 0;
 137 }
 138
 139 int
 140 virtio_user_dev_set_features(struct virtio_user_dev *dev)
 141 {
 142         uint64_t features;
 143         int ret = -1;
 144
 145         pthread_mutex_lock(&dev->mutex);
 146
 147         /* Step 0: tell vhost to create queues */
 148         if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
 149                 goto error;
 150
 151         features = dev->features;
 152
 153         /* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */
 154         features &= ~(1ull << VIRTIO_NET_F_MAC);
 155         /* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
 156         features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
 157         features &= ~(1ull << VIRTIO_NET_F_STATUS);
 158         ret = dev->ops->set_features(dev, features);
 159         if (ret < 0)
 160                 goto error;
 161         PMD_DRV_LOG(INFO, "(%s) set features: 0x%" PRIx64, dev->path, features);
 162 error:
 163         pthread_mutex_unlock(&dev->mutex);
 164
 165         return ret;
 166 }
 167
 168 int
 169 virtio_user_start_device(struct virtio_user_dev *dev)
 170 {
 171         int ret;
 172
 173         /*
 174          * XXX workaround!
 175          *
 176          * We need to make sure that the locks will be
 177          * taken in the correct order to avoid deadlocks.
 178          *
 179          * Before releasing this lock, this thread should
 180          * not trigger any memory hotplug events.
 181          *
 182          * This is a temporary workaround, and should be
 183          * replaced when we get proper supports from the
 184          * memory subsystem in the future.
 185          */
 186         rte_mcfg_mem_read_lock();
 187         pthread_mutex_lock(&dev->mutex);
 188
 189         /* Step 2: share memory regions */
 190         ret = dev->ops->set_memory_table(dev);
 191         if (ret < 0)
 192                 goto error;
 193
 194         /* Step 3: kick queues */
 195         ret = virtio_user_queue_setup(dev, virtio_user_kick_queue);
 196         if (ret < 0)
 197                 goto error;
 198
 199         /* Step 4: enable queues
 200          * we enable the 1st queue pair by default.
 201          */
 202         ret = dev->ops->enable_qp(dev, 0, 1);
 203         if (ret < 0)
 204                 goto error;
 205
 206         dev->started = true;
 207
 208         pthread_mutex_unlock(&dev->mutex);
 209         rte_mcfg_mem_read_unlock();
 210
 211         return 0;
 212 error:
 213         pthread_mutex_unlock(&dev->mutex);
 214         rte_mcfg_mem_read_unlock();
 215
 216         PMD_INIT_LOG(ERR, "(%s) Failed to start device\n", dev->path);
 217
 218         /* TODO: free resource here or caller to check */
 219         return -1;
 220 }
 221
 222 int virtio_user_stop_device(struct virtio_user_dev *dev)
 223 {
 224         struct vhost_vring_state state;
 225         uint32_t i;
 226         int ret;
 227
 228         pthread_mutex_lock(&dev->mutex);
 229         if (!dev->started)
 230                 goto out;
 231
 232         for (i = 0; i < dev->max_queue_pairs; ++i) {
 233                 ret = dev->ops->enable_qp(dev, i, 0);
 234                 if (ret < 0)
 235                         goto err;
 236         }
 237
 238         /* Stop the backend. */
 239         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 240                 state.index = i;
 241                 ret = dev->ops->get_vring_base(dev, &state);
 242                 if (ret < 0) {
 243                         PMD_DRV_LOG(ERR, "(%s) get_vring_base failed, index=%u", dev->path, i);
 244                         goto err;
 245                 }
 246         }
 247
 248         dev->started = false;
 249
 250 out:
 251         pthread_mutex_unlock(&dev->mutex);
 252
 253         return 0;
 254 err:
 255         pthread_mutex_unlock(&dev->mutex);
 256
 257         PMD_INIT_LOG(ERR, "(%s) Failed to stop device\n", dev->path);
 258
 259         return -1;
 260 }
 261
 262 static inline void
 263 parse_mac(struct virtio_user_dev *dev, const char *mac)
 264 {
 265         struct rte_ether_addr tmp;
 266
 267         if (!mac)
 268                 return;
 269
 270         if (rte_ether_unformat_addr(mac, &tmp) == 0) {
 271                 memcpy(dev->mac_addr, &tmp, RTE_ETHER_ADDR_LEN);
 272                 dev->mac_specified = 1;
 273         } else {
 274                 /* ignore the wrong mac, use random mac */
 275                 PMD_DRV_LOG(ERR, "wrong format of mac: %s", mac);
 276         }
 277 }
 278
 279 static int
 280 virtio_user_dev_init_notify(struct virtio_user_dev *dev)
 281 {
 282         uint32_t i, j;
 283         int callfd;
 284         int kickfd;
 285
 286         for (i = 0; i < dev->max_queue_pairs * 2; i++) {
 287                 /* May use invalid flag, but some backend uses kickfd and
 288                  * callfd as criteria to judge if dev is alive. so finally we
 289                  * use real event_fd.
 290                  */
 291                 callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 292                 if (callfd < 0) {
 293                         PMD_DRV_LOG(ERR, "(%s) callfd error, %s", dev->path, strerror(errno));
 294                         goto err;
 295                 }
 296                 kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 297                 if (kickfd < 0) {
 298                         close(callfd);
 299                         PMD_DRV_LOG(ERR, "(%s) kickfd error, %s", dev->path, strerror(errno));
 300                         goto err;
 301                 }
 302                 dev->callfds[i] = callfd;
 303                 dev->kickfds[i] = kickfd;
 304         }
 305
 306         return 0;
 307 err:
 308         for (j = 0; j < i; j++) {
 309                 if (dev->kickfds[j] >= 0) {
 310                         close(dev->kickfds[j]);
 311                         dev->kickfds[j] = -1;
 312                 }
 313                 if (dev->callfds[j] >= 0) {
 314                         close(dev->callfds[j]);
 315                         dev->callfds[j] = -1;
 316                 }
 317         }
 318
 319         return -1;
 320 }
 321
 322 static void
 323 virtio_user_dev_uninit_notify(struct virtio_user_dev *dev)
 324 {
 325         uint32_t i;
 326
 327         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 328                 if (dev->kickfds[i] >= 0) {
 329                         close(dev->kickfds[i]);
 330                         dev->kickfds[i] = -1;
 331                 }
 332                 if (dev->callfds[i] >= 0) {
 333                         close(dev->callfds[i]);
 334                         dev->callfds[i] = -1;
 335                 }
 336         }
 337 }
 338
 339 static int
 340 virtio_user_fill_intr_handle(struct virtio_user_dev *dev)
 341 {
 342         uint32_t i;
 343         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
 344
 345         if (!eth_dev->intr_handle) {
 346                 eth_dev->intr_handle = malloc(sizeof(*eth_dev->intr_handle));
 347                 if (!eth_dev->intr_handle) {
 348                         PMD_DRV_LOG(ERR, "(%s) failed to allocate intr_handle", dev->path);
 349                         return -1;
 350                 }
 351                 memset(eth_dev->intr_handle, 0, sizeof(*eth_dev->intr_handle));
 352         }
 353
 354         for (i = 0; i < dev->max_queue_pairs; ++i)
 355                 eth_dev->intr_handle->efds[i] = dev->callfds[i];
 356         eth_dev->intr_handle->nb_efd = dev->max_queue_pairs;
 357         eth_dev->intr_handle->max_intr = dev->max_queue_pairs + 1;
 358         eth_dev->intr_handle->type = RTE_INTR_HANDLE_VDEV;
 359         /* For virtio vdev, no need to read counter for clean */
 360         eth_dev->intr_handle->efd_counter_size = 0;
 361         eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
 362
 363         return 0;
 364 }
 365
 366 static void
 367 virtio_user_mem_event_cb(enum rte_mem_event type __rte_unused,
 368                          const void *addr,
 369                          size_t len __rte_unused,
 370                          void *arg)
 371 {
 372         struct virtio_user_dev *dev = arg;
 373         struct rte_memseg_list *msl;
 374         uint16_t i;
 375         int ret = 0;
 376
 377         /* ignore externally allocated memory */
 378         msl = rte_mem_virt2memseg_list(addr);
 379         if (msl->external)
 380                 return;
 381
 382         pthread_mutex_lock(&dev->mutex);
 383
 384         if (dev->started == false)
 385                 goto exit;
 386
 387         /* Step 1: pause the active queues */
 388         for (i = 0; i < dev->queue_pairs; i++) {
 389                 ret = dev->ops->enable_qp(dev, i, 0);
 390                 if (ret < 0)
 391                         goto exit;
 392         }
 393
 394         /* Step 2: update memory regions */
 395         ret = dev->ops->set_memory_table(dev);
 396         if (ret < 0)
 397                 goto exit;
 398
 399         /* Step 3: resume the active queues */
 400         for (i = 0; i < dev->queue_pairs; i++) {
 401                 ret = dev->ops->enable_qp(dev, i, 1);
 402                 if (ret < 0)
 403                         goto exit;
 404         }
 405
 406 exit:
 407         pthread_mutex_unlock(&dev->mutex);
 408
 409         if (ret < 0)
 410                 PMD_DRV_LOG(ERR, "(%s) Failed to update memory table\n", dev->path);
 411 }
 412
 413 static int
 414 virtio_user_dev_setup(struct virtio_user_dev *dev)
 415 {
 416         if (dev->is_server) {
 417                 if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER) {
 418                         PMD_DRV_LOG(ERR, "Server mode only supports vhost-user!");
 419                         return -1;
 420                 }
 421         }
 422
 423         switch (dev->backend_type) {
 424         case VIRTIO_USER_BACKEND_VHOST_USER:
 425                 dev->ops = &virtio_ops_user;
 426                 break;
 427         case VIRTIO_USER_BACKEND_VHOST_KERNEL:
 428                 dev->ops = &virtio_ops_kernel;
 429                 break;
 430         case VIRTIO_USER_BACKEND_VHOST_VDPA:
 431                 dev->ops = &virtio_ops_vdpa;
 432                 break;
 433         default:
 434                 PMD_DRV_LOG(ERR, "(%s) Unknown backend type", dev->path);
 435                 return -1;
 436         }
 437
 438         if (dev->ops->setup(dev) < 0) {
 439                 PMD_INIT_LOG(ERR, "(%s) Failed to setup backend\n", dev->path);
 440                 return -1;
 441         }
 442
 443         if (virtio_user_dev_init_notify(dev) < 0) {
 444                 PMD_INIT_LOG(ERR, "(%s) Failed to init notifiers\n", dev->path);
 445                 goto destroy;
 446         }
 447
 448         if (virtio_user_fill_intr_handle(dev) < 0) {
 449                 PMD_INIT_LOG(ERR, "(%s) Failed to init interrupt handler\n", dev->path);
 450                 goto uninit;
 451         }
 452
 453         return 0;
 454
 455 uninit:
 456         virtio_user_dev_uninit_notify(dev);
 457 destroy:
 458         dev->ops->destroy(dev);
 459
 460         return -1;
 461 }
 462
 463 /* Use below macro to filter features from vhost backend */
 464 #define VIRTIO_USER_SUPPORTED_FEATURES                  \
 465         (1ULL << VIRTIO_NET_F_MAC               |       \
 466          1ULL << VIRTIO_NET_F_STATUS            |       \
 467          1ULL << VIRTIO_NET_F_MQ                |       \
 468          1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR     |       \
 469          1ULL << VIRTIO_NET_F_CTRL_VQ           |       \
 470          1ULL << VIRTIO_NET_F_CTRL_RX           |       \
 471          1ULL << VIRTIO_NET_F_CTRL_VLAN         |       \
 472          1ULL << VIRTIO_NET_F_CSUM              |       \
 473          1ULL << VIRTIO_NET_F_HOST_TSO4         |       \
 474          1ULL << VIRTIO_NET_F_HOST_TSO6         |       \
 475          1ULL << VIRTIO_NET_F_MRG_RXBUF         |       \
 476          1ULL << VIRTIO_RING_F_INDIRECT_DESC    |       \
 477          1ULL << VIRTIO_NET_F_GUEST_CSUM        |       \
 478          1ULL << VIRTIO_NET_F_GUEST_TSO4        |       \
 479          1ULL << VIRTIO_NET_F_GUEST_TSO6        |       \
 480          1ULL << VIRTIO_F_IN_ORDER              |       \
 481          1ULL << VIRTIO_F_VERSION_1             |       \
 482          1ULL << VIRTIO_F_RING_PACKED)
 483
 484 int
 485 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
 486                      int cq, int queue_size, const char *mac, char **ifname,
 487                      int server, int mrg_rxbuf, int in_order, int packed_vq,
 488                      enum virtio_user_backend_type backend_type)
 489 {
 490         uint64_t backend_features;
 491         int i;
 492
 493         pthread_mutex_init(&dev->mutex, NULL);
 494         strlcpy(dev->path, path, PATH_MAX);
 495
 496         for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; i++) {
 497                 dev->kickfds[i] = -1;
 498                 dev->callfds[i] = -1;
 499         }
 500
 501         dev->started = 0;
 502         dev->max_queue_pairs = queues;
 503         dev->queue_pairs = 1; /* mq disabled by default */
 504         dev->queue_size = queue_size;
 505         dev->is_server = server;
 506         dev->mac_specified = 0;
 507         dev->frontend_features = 0;
 508         dev->unsupported_features = 0;
 509         dev->backend_type = backend_type;
 510
 511         parse_mac(dev, mac);
 512
 513         if (*ifname) {
 514                 dev->ifname = *ifname;
 515                 *ifname = NULL;
 516         }
 517
 518         if (virtio_user_dev_setup(dev) < 0) {
 519                 PMD_INIT_LOG(ERR, "(%s) backend set up fails", dev->path);
 520                 return -1;
 521         }
 522
 523         if (dev->ops->set_owner(dev) < 0) {
 524                 PMD_INIT_LOG(ERR, "(%s) Failed to set backend owner", dev->path);
 525                 return -1;
 526         }
 527
 528         if (dev->ops->get_backend_features(&backend_features) < 0) {
 529                 PMD_INIT_LOG(ERR, "(%s) Failed to get backend features", dev->path);
 530                 return -1;
 531         }
 532
 533         dev->unsupported_features = ~(VIRTIO_USER_SUPPORTED_FEATURES | backend_features);
 534
 535         if (dev->ops->get_features(dev, &dev->device_features) < 0) {
 536                 PMD_INIT_LOG(ERR, "(%s) Failed to get device features", dev->path);
 537                 return -1;
 538         }
 539
 540         if (!mrg_rxbuf)
 541                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MRG_RXBUF);
 542
 543         if (!in_order)
 544                 dev->unsupported_features |= (1ull << VIRTIO_F_IN_ORDER);
 545
 546         if (!packed_vq)
 547                 dev->unsupported_features |= (1ull << VIRTIO_F_RING_PACKED);
 548
 549         if (dev->mac_specified)
 550                 dev->frontend_features |= (1ull << VIRTIO_NET_F_MAC);
 551         else
 552                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MAC);
 553
 554         if (cq) {
 555                 /* device does not really need to know anything about CQ,
 556                  * so if necessary, we just claim to support CQ
 557                  */
 558                 dev->frontend_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 559         } else {
 560                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 561                 /* Also disable features that depend on VIRTIO_NET_F_CTRL_VQ */
 562                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_RX);
 563                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VLAN);
 564                 dev->unsupported_features |=
 565                         (1ull << VIRTIO_NET_F_GUEST_ANNOUNCE);
 566                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MQ);
 567                 dev->unsupported_features |=
 568                         (1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
 569         }
 570
 571         /* The backend will not report this feature, we add it explicitly */
 572         if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER)
 573                 dev->frontend_features |= (1ull << VIRTIO_NET_F_STATUS);
 574
 575         /*
 576          * Device features =
 577          *     (frontend_features | backend_features) & ~unsupported_features;
 578          */
 579         dev->device_features |= dev->frontend_features;
 580         dev->device_features &= ~dev->unsupported_features;
 581
 582         if (rte_mem_event_callback_register(VIRTIO_USER_MEM_EVENT_CLB_NAME,
 583                                 virtio_user_mem_event_cb, dev)) {
 584                 if (rte_errno != ENOTSUP) {
 585                         PMD_INIT_LOG(ERR, "(%s) Failed to register mem event callback\n",
 586                                         dev->path);
 587                         return -1;
 588                 }
 589         }
 590
 591         return 0;
 592 }
 593
 594 void
 595 virtio_user_dev_uninit(struct virtio_user_dev *dev)
 596 {
 597         virtio_user_stop_device(dev);
 598
 599         rte_mem_event_callback_unregister(VIRTIO_USER_MEM_EVENT_CLB_NAME, dev);
 600
 601         virtio_user_dev_uninit_notify(dev);
 602
 603         free(dev->ifname);
 604
 605         if (dev->is_server)
 606                 unlink(dev->path);
 607
 608         dev->ops->destroy(dev);
 609 }
 610
 611 uint8_t
 612 virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs)
 613 {
 614         uint16_t i;
 615         uint8_t ret = 0;
 616
 617         if (q_pairs > dev->max_queue_pairs) {
 618                 PMD_INIT_LOG(ERR, "(%s) multi-q config %u, but only %u supported",
 619                              dev->path, q_pairs, dev->max_queue_pairs);
 620                 return -1;
 621         }
 622
 623         for (i = 0; i < q_pairs; ++i)
 624                 ret |= dev->ops->enable_qp(dev, i, 1);
 625         for (i = q_pairs; i < dev->max_queue_pairs; ++i)
 626                 ret |= dev->ops->enable_qp(dev, i, 0);
 627
 628         dev->queue_pairs = q_pairs;
 629
 630         return ret;
 631 }
 632
 633 static uint32_t
 634 virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring,
 635                             uint16_t idx_hdr)
 636 {
 637         struct virtio_net_ctrl_hdr *hdr;
 638         virtio_net_ctrl_ack status = ~0;
 639         uint16_t i, idx_data, idx_status;
 640         uint32_t n_descs = 0;
 641
 642         /* locate desc for header, data, and status */
 643         idx_data = vring->desc[idx_hdr].next;
 644         n_descs++;
 645
 646         i = idx_data;
 647         while (vring->desc[i].flags == VRING_DESC_F_NEXT) {
 648                 i = vring->desc[i].next;
 649                 n_descs++;
 650         }
 651
 652         /* locate desc for status */
 653         idx_status = i;
 654         n_descs++;
 655
 656         hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
 657         if (hdr->class == VIRTIO_NET_CTRL_MQ &&
 658             hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
 659                 uint16_t queues;
 660
 661                 queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr;
 662                 status = virtio_user_handle_mq(dev, queues);
 663         } else if (hdr->class == VIRTIO_NET_CTRL_RX  ||
 664                    hdr->class == VIRTIO_NET_CTRL_MAC ||
 665                    hdr->class == VIRTIO_NET_CTRL_VLAN) {
 666                 status = 0;
 667         }
 668
 669         /* Update status */
 670         *(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status;
 671
 672         return n_descs;
 673 }
 674
 675 static inline int
 676 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
 677 {
 678         uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
 679
 680         return wrap_counter == !!(flags & VRING_PACKED_DESC_F_AVAIL) &&
 681                 wrap_counter != !!(flags & VRING_PACKED_DESC_F_USED);
 682 }
 683
 684 static uint32_t
 685 virtio_user_handle_ctrl_msg_packed(struct virtio_user_dev *dev,
 686                                    struct vring_packed *vring,
 687                                    uint16_t idx_hdr)
 688 {
 689         struct virtio_net_ctrl_hdr *hdr;
 690         virtio_net_ctrl_ack status = ~0;
 691         uint16_t idx_data, idx_status;
 692         /* initialize to one, header is first */
 693         uint32_t n_descs = 1;
 694
 695         /* locate desc for header, data, and status */
 696         idx_data = idx_hdr + 1;
 697         if (idx_data >= dev->queue_size)
 698                 idx_data -= dev->queue_size;
 699
 700         n_descs++;
 701
 702         idx_status = idx_data;
 703         while (vring->desc[idx_status].flags & VRING_DESC_F_NEXT) {
 704                 idx_status++;
 705                 if (idx_status >= dev->queue_size)
 706                         idx_status -= dev->queue_size;
 707                 n_descs++;
 708         }
 709
 710         hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
 711         if (hdr->class == VIRTIO_NET_CTRL_MQ &&
 712             hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
 713                 uint16_t queues;
 714
 715                 queues = *(uint16_t *)(uintptr_t)
 716                                 vring->desc[idx_data].addr;
 717                 status = virtio_user_handle_mq(dev, queues);
 718         } else if (hdr->class == VIRTIO_NET_CTRL_RX  ||
 719                    hdr->class == VIRTIO_NET_CTRL_MAC ||
 720                    hdr->class == VIRTIO_NET_CTRL_VLAN) {
 721                 status = 0;
 722         }
 723
 724         /* Update status */
 725         *(virtio_net_ctrl_ack *)(uintptr_t)
 726                 vring->desc[idx_status].addr = status;
 727
 728         /* Update used descriptor */
 729         vring->desc[idx_hdr].id = vring->desc[idx_status].id;
 730         vring->desc[idx_hdr].len = sizeof(status);
 731
 732         return n_descs;
 733 }
 734
 735 void
 736 virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx)
 737 {
 738         struct virtio_user_queue *vq = &dev->packed_queues[queue_idx];
 739         struct vring_packed *vring = &dev->packed_vrings[queue_idx];
 740         uint16_t n_descs, flags;
 741
 742         /* Perform a load-acquire barrier in desc_is_avail to
 743          * enforce the ordering between desc flags and desc
 744          * content.
 745          */
 746         while (desc_is_avail(&vring->desc[vq->used_idx],
 747                              vq->used_wrap_counter)) {
 748
 749                 n_descs = virtio_user_handle_ctrl_msg_packed(dev, vring,
 750                                 vq->used_idx);
 751
 752                 flags = VRING_DESC_F_WRITE;
 753                 if (vq->used_wrap_counter)
 754                         flags |= VRING_PACKED_DESC_F_AVAIL_USED;
 755
 756                 __atomic_store_n(&vring->desc[vq->used_idx].flags, flags,
 757                                  __ATOMIC_RELEASE);
 758
 759                 vq->used_idx += n_descs;
 760                 if (vq->used_idx >= dev->queue_size) {
 761                         vq->used_idx -= dev->queue_size;
 762                         vq->used_wrap_counter ^= 1;
 763                 }
 764         }
 765 }
 766
 767 void
 768 virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
 769 {
 770         uint16_t avail_idx, desc_idx;
 771         struct vring_used_elem *uep;
 772         uint32_t n_descs;
 773         struct vring *vring = &dev->vrings[queue_idx];
 774
 775         /* Consume avail ring, using used ring idx as first one */
 776         while (__atomic_load_n(&vring->used->idx, __ATOMIC_RELAXED)
 777                != vring->avail->idx) {
 778                 avail_idx = __atomic_load_n(&vring->used->idx, __ATOMIC_RELAXED)
 779                             & (vring->num - 1);
 780                 desc_idx = vring->avail->ring[avail_idx];
 781
 782                 n_descs = virtio_user_handle_ctrl_msg(dev, vring, desc_idx);
 783
 784                 /* Update used ring */
 785                 uep = &vring->used->ring[avail_idx];
 786                 uep->id = desc_idx;
 787                 uep->len = n_descs;
 788
 789                 __atomic_add_fetch(&vring->used->idx, 1, __ATOMIC_RELAXED);
 790         }
 791 }
 792
 793 int
 794 virtio_user_dev_set_status(struct virtio_user_dev *dev, uint8_t status)
 795 {
 796         int ret;
 797
 798         pthread_mutex_lock(&dev->mutex);
 799         dev->status = status;
 800         ret = dev->ops->set_status(dev, status);
 801         if (ret && ret != -ENOTSUP)
 802                 PMD_INIT_LOG(ERR, "(%s) Failed to set backend status\n", dev->path);
 803
 804         pthread_mutex_unlock(&dev->mutex);
 805         return ret;
 806 }
 807
 808 int
 809 virtio_user_dev_update_status(struct virtio_user_dev *dev)
 810 {
 811         int ret;
 812         uint8_t status;
 813
 814         pthread_mutex_lock(&dev->mutex);
 815
 816         ret = dev->ops->get_status(dev, &status);
 817         if (!ret) {
 818                 dev->status = status;
 819                 PMD_INIT_LOG(DEBUG, "Updated Device Status(0x%08x):\n"
 820                         "\t-RESET: %u\n"
 821                         "\t-ACKNOWLEDGE: %u\n"
 822                         "\t-DRIVER: %u\n"
 823                         "\t-DRIVER_OK: %u\n"
 824                         "\t-FEATURES_OK: %u\n"
 825                         "\t-DEVICE_NEED_RESET: %u\n"
 826                         "\t-FAILED: %u\n",
 827                         dev->status,
 828                         (dev->status == VIRTIO_CONFIG_STATUS_RESET),
 829                         !!(dev->status & VIRTIO_CONFIG_STATUS_ACK),
 830                         !!(dev->status & VIRTIO_CONFIG_STATUS_DRIVER),
 831                         !!(dev->status & VIRTIO_CONFIG_STATUS_DRIVER_OK),
 832                         !!(dev->status & VIRTIO_CONFIG_STATUS_FEATURES_OK),
 833                         !!(dev->status & VIRTIO_CONFIG_STATUS_DEV_NEED_RESET),
 834                         !!(dev->status & VIRTIO_CONFIG_STATUS_FAILED));
 835         } else if (ret != -ENOTSUP) {
 836                 PMD_INIT_LOG(ERR, "(%s) Failed to get backend status\n", dev->path);
 837         }
 838
 839         pthread_mutex_unlock(&dev->mutex);
 840         return ret;
 841 }
 842
 843 int
 844 virtio_user_dev_update_link_state(struct virtio_user_dev *dev)
 845 {
 846         if (dev->ops->update_link_state)
 847                 return dev->ops->update_link_state(dev);
 848
 849         return 0;
 850 }
 851
 852 static void
 853 virtio_user_dev_reset_queues_packed(struct rte_eth_dev *eth_dev)
 854 {
 855         struct virtio_user_dev *dev = eth_dev->data->dev_private;
 856         struct virtio_hw *hw = &dev->hw;
 857         struct virtnet_rx *rxvq;
 858         struct virtnet_tx *txvq;
 859         uint16_t i;
 860
 861         /* Add lock to avoid queue contention. */
 862         rte_spinlock_lock(&hw->state_lock);
 863         hw->started = 0;
 864
 865         /*
 866          * Waiting for datapath to complete before resetting queues.
 867          * 1 ms should be enough for the ongoing Tx/Rx function to finish.
 868          */
 869         rte_delay_ms(1);
 870
 871         /* Vring reset for each Tx queue and Rx queue. */
 872         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 873                 rxvq = eth_dev->data->rx_queues[i];
 874                 virtqueue_rxvq_reset_packed(virtnet_rxq_to_vq(rxvq));
 875                 virtio_dev_rx_queue_setup_finish(eth_dev, i);
 876         }
 877
 878         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 879                 txvq = eth_dev->data->tx_queues[i];
 880                 virtqueue_txvq_reset_packed(virtnet_txq_to_vq(txvq));
 881         }
 882
 883         hw->started = 1;
 884         rte_spinlock_unlock(&hw->state_lock);
 885 }
 886
 887 void
 888 virtio_user_dev_delayed_handler(void *param)
 889 {
 890         struct virtio_user_dev *dev = param;
 891         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
 892
 893         if (rte_intr_disable(eth_dev->intr_handle) < 0) {
 894                 PMD_DRV_LOG(ERR, "interrupt disable failed");
 895                 return;
 896         }
 897         rte_intr_callback_unregister(eth_dev->intr_handle,
 898                                      virtio_interrupt_handler, eth_dev);
 899         if (dev->is_server) {
 900                 if (dev->ops->server_disconnect)
 901                         dev->ops->server_disconnect(dev);
 902                 eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
 903                 rte_intr_callback_register(eth_dev->intr_handle,
 904                                            virtio_interrupt_handler, eth_dev);
 905                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
 906                         PMD_DRV_LOG(ERR, "interrupt enable failed");
 907                         return;
 908                 }
 909         }
 910 }
 911
 912 int
 913 virtio_user_dev_server_reconnect(struct virtio_user_dev *dev)
 914 {
 915         int ret, old_status;
 916         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
 917         struct virtio_hw *hw = &dev->hw;
 918
 919         if (!dev->ops->server_reconnect) {
 920                 PMD_DRV_LOG(ERR, "(%s) Missing server reconnect callback", dev->path);
 921                 return -1;
 922         }
 923
 924         if (dev->ops->server_reconnect(dev)) {
 925                 PMD_DRV_LOG(ERR, "(%s) Reconnect callback call failed", dev->path);
 926                 return -1;
 927         }
 928
 929         old_status = dev->status;
 930
 931         virtio_reset(hw);
 932
 933         virtio_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 934
 935         virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 936
 937         if (dev->ops->get_features(dev, &dev->device_features) < 0) {
 938                 PMD_INIT_LOG(ERR, "get_features failed: %s",
 939                              strerror(errno));
 940                 return -1;
 941         }
 942
 943         dev->device_features |= dev->frontend_features;
 944
 945         /* unmask vhost-user unsupported features */
 946         dev->device_features &= ~(dev->unsupported_features);
 947
 948         dev->features &= dev->device_features;
 949
 950         /* For packed ring, resetting queues is required in reconnection. */
 951         if (virtio_with_packed_queue(hw) &&
 952            (old_status & VIRTIO_CONFIG_STATUS_DRIVER_OK)) {
 953                 PMD_INIT_LOG(NOTICE, "Packets on the fly will be dropped"
 954                                 " when packed ring reconnecting.");
 955                 virtio_user_dev_reset_queues_packed(eth_dev);
 956         }
 957
 958         virtio_set_status(hw, VIRTIO_CONFIG_STATUS_FEATURES_OK);
 959
 960         /* Start the device */
 961         virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
 962         if (!dev->started)
 963                 return -1;
 964
 965         if (dev->queue_pairs > 1) {
 966                 ret = virtio_user_handle_mq(dev, dev->queue_pairs);
 967                 if (ret != 0) {
 968                         PMD_INIT_LOG(ERR, "Fails to enable multi-queue pairs!");
 969                         return -1;
 970                 }
 971         }
 972         if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) {
 973                 if (rte_intr_disable(eth_dev->intr_handle) < 0) {
 974                         PMD_DRV_LOG(ERR, "interrupt disable failed");
 975                         return -1;
 976                 }
 977                 rte_intr_callback_unregister(eth_dev->intr_handle,
 978                                              virtio_interrupt_handler,
 979                                              eth_dev);
 980
 981                 eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
 982                 rte_intr_callback_register(eth_dev->intr_handle,
 983                                            virtio_interrupt_handler, eth_dev);
 984
 985                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
 986                         PMD_DRV_LOG(ERR, "interrupt enable failed");
 987                         return -1;
 988                 }
 989         }
 990         PMD_INIT_LOG(NOTICE, "server mode virtio-user reconnection succeeds!");
 991         return 0;
 992 }