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_alarm.h>
  17 #include <rte_string_fns.h>
  18 #include <rte_eal_memconfig.h>
  19
  20 #include "vhost.h"
  21 #include "virtio_user_dev.h"
  22 #include "../virtio_ethdev.h"
  23
  24 #define VIRTIO_USER_MEM_EVENT_CLB_NAME "virtio_user_mem_event_clb"
  25
  26 const char * const virtio_user_backend_strings[] = {
  27         [VIRTIO_USER_BACKEND_UNKNOWN] = "VIRTIO_USER_BACKEND_UNKNOWN",
  28         [VIRTIO_USER_BACKEND_VHOST_USER] = "VHOST_USER",
  29         [VIRTIO_USER_BACKEND_VHOST_KERNEL] = "VHOST_NET",
  30         [VIRTIO_USER_BACKEND_VHOST_VDPA] = "VHOST_VDPA",
  31 };
  32
  33 static int
  34 virtio_user_create_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  35 {
  36         /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come
  37          * firstly because vhost depends on this msg to allocate virtqueue
  38          * pair.
  39          */
  40         struct vhost_vring_file file;
  41         int ret;
  42
  43         file.index = queue_sel;
  44         file.fd = dev->callfds[queue_sel];
  45         ret = dev->ops->set_vring_call(dev, &file);
  46         if (ret < 0) {
  47                 PMD_INIT_LOG(ERR, "(%s) Failed to create queue %u\n", dev->path, queue_sel);
  48                 return -1;
  49         }
  50
  51         return 0;
  52 }
  53
  54 static int
  55 virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  56 {
  57         int ret;
  58         struct vhost_vring_file file;
  59         struct vhost_vring_state state;
  60         struct vring *vring = &dev->vrings[queue_sel];
  61         struct vring_packed *pq_vring = &dev->packed_vrings[queue_sel];
  62         struct vhost_vring_addr addr = {
  63                 .index = queue_sel,
  64                 .log_guest_addr = 0,
  65                 .flags = 0, /* disable log */
  66         };
  67
  68         if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) {
  69                 addr.desc_user_addr =
  70                         (uint64_t)(uintptr_t)pq_vring->desc;
  71                 addr.avail_user_addr =
  72                         (uint64_t)(uintptr_t)pq_vring->driver;
  73                 addr.used_user_addr =
  74                         (uint64_t)(uintptr_t)pq_vring->device;
  75         } else {
  76                 addr.desc_user_addr = (uint64_t)(uintptr_t)vring->desc;
  77                 addr.avail_user_addr = (uint64_t)(uintptr_t)vring->avail;
  78                 addr.used_user_addr = (uint64_t)(uintptr_t)vring->used;
  79         }
  80
  81         state.index = queue_sel;
  82         state.num = vring->num;
  83         ret = dev->ops->set_vring_num(dev, &state);
  84         if (ret < 0)
  85                 goto err;
  86
  87         state.index = queue_sel;
  88         state.num = 0; /* no reservation */
  89         if (dev->features & (1ULL << VIRTIO_F_RING_PACKED))
  90                 state.num |= (1 << 15);
  91         ret = dev->ops->set_vring_base(dev, &state);
  92         if (ret < 0)
  93                 goto err;
  94
  95         ret = dev->ops->set_vring_addr(dev, &addr);
  96         if (ret < 0)
  97                 goto err;
  98
  99         /* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
 100          * lastly because vhost depends on this msg to judge if
 101          * virtio is ready.
 102          */
 103         file.index = queue_sel;
 104         file.fd = dev->kickfds[queue_sel];
 105         ret = dev->ops->set_vring_kick(dev, &file);
 106         if (ret < 0)
 107                 goto err;
 108
 109         return 0;
 110 err:
 111         PMD_INIT_LOG(ERR, "(%s) Failed to kick queue %u\n", dev->path, queue_sel);
 112
 113         return -1;
 114 }
 115
 116 static int
 117 virtio_user_queue_setup(struct virtio_user_dev *dev,
 118                         int (*fn)(struct virtio_user_dev *, uint32_t))
 119 {
 120         uint32_t i, queue_sel;
 121
 122         for (i = 0; i < dev->max_queue_pairs; ++i) {
 123                 queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX;
 124                 if (fn(dev, queue_sel) < 0) {
 125                         PMD_DRV_LOG(ERR, "(%s) setup rx vq %u failed", dev->path, i);
 126                         return -1;
 127                 }
 128         }
 129         for (i = 0; i < dev->max_queue_pairs; ++i) {
 130                 queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX;
 131                 if (fn(dev, queue_sel) < 0) {
 132                         PMD_DRV_LOG(INFO, "(%s) setup tx vq %u failed", dev->path, i);
 133                         return -1;
 134                 }
 135         }
 136
 137         return 0;
 138 }
 139
 140 int
 141 virtio_user_dev_set_features(struct virtio_user_dev *dev)
 142 {
 143         uint64_t features;
 144         int ret = -1;
 145
 146         pthread_mutex_lock(&dev->mutex);
 147
 148         /* Step 0: tell vhost to create queues */
 149         if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
 150                 goto error;
 151
 152         features = dev->features;
 153
 154         /* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */
 155         features &= ~(1ull << VIRTIO_NET_F_MAC);
 156         /* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
 157         features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
 158         features &= ~(1ull << VIRTIO_NET_F_STATUS);
 159         ret = dev->ops->set_features(dev, features);
 160         if (ret < 0)
 161                 goto error;
 162         PMD_DRV_LOG(INFO, "(%s) set features: 0x%" PRIx64, dev->path, features);
 163 error:
 164         pthread_mutex_unlock(&dev->mutex);
 165
 166         return ret;
 167 }
 168
 169 int
 170 virtio_user_start_device(struct virtio_user_dev *dev)
 171 {
 172         int ret;
 173
 174         /*
 175          * XXX workaround!
 176          *
 177          * We need to make sure that the locks will be
 178          * taken in the correct order to avoid deadlocks.
 179          *
 180          * Before releasing this lock, this thread should
 181          * not trigger any memory hotplug events.
 182          *
 183          * This is a temporary workaround, and should be
 184          * replaced when we get proper supports from the
 185          * memory subsystem in the future.
 186          */
 187         rte_mcfg_mem_read_lock();
 188         pthread_mutex_lock(&dev->mutex);
 189
 190         /* Step 2: share memory regions */
 191         ret = dev->ops->set_memory_table(dev);
 192         if (ret < 0)
 193                 goto error;
 194
 195         /* Step 3: kick queues */
 196         ret = virtio_user_queue_setup(dev, virtio_user_kick_queue);
 197         if (ret < 0)
 198                 goto error;
 199
 200         /* Step 4: enable queues
 201          * we enable the 1st queue pair by default.
 202          */
 203         ret = dev->ops->enable_qp(dev, 0, 1);
 204         if (ret < 0)
 205                 goto error;
 206
 207         dev->started = true;
 208
 209         pthread_mutex_unlock(&dev->mutex);
 210         rte_mcfg_mem_read_unlock();
 211
 212         return 0;
 213 error:
 214         pthread_mutex_unlock(&dev->mutex);
 215         rte_mcfg_mem_read_unlock();
 216
 217         PMD_INIT_LOG(ERR, "(%s) Failed to start device\n", dev->path);
 218
 219         /* TODO: free resource here or caller to check */
 220         return -1;
 221 }
 222
 223 int virtio_user_stop_device(struct virtio_user_dev *dev)
 224 {
 225         struct vhost_vring_state state;
 226         uint32_t i;
 227         int ret;
 228
 229         pthread_mutex_lock(&dev->mutex);
 230         if (!dev->started)
 231                 goto out;
 232
 233         for (i = 0; i < dev->max_queue_pairs; ++i) {
 234                 ret = dev->ops->enable_qp(dev, i, 0);
 235                 if (ret < 0)
 236                         goto err;
 237         }
 238
 239         /* Stop the backend. */
 240         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 241                 state.index = i;
 242                 ret = dev->ops->get_vring_base(dev, &state);
 243                 if (ret < 0) {
 244                         PMD_DRV_LOG(ERR, "(%s) get_vring_base failed, index=%u", dev->path, i);
 245                         goto err;
 246                 }
 247         }
 248
 249         dev->started = false;
 250
 251 out:
 252         pthread_mutex_unlock(&dev->mutex);
 253
 254         return 0;
 255 err:
 256         pthread_mutex_unlock(&dev->mutex);
 257
 258         PMD_INIT_LOG(ERR, "(%s) Failed to stop device\n", dev->path);
 259
 260         return -1;
 261 }
 262
 263 static inline void
 264 parse_mac(struct virtio_user_dev *dev, const char *mac)
 265 {
 266         struct rte_ether_addr tmp;
 267
 268         if (!mac)
 269                 return;
 270
 271         if (rte_ether_unformat_addr(mac, &tmp) == 0) {
 272                 memcpy(dev->mac_addr, &tmp, RTE_ETHER_ADDR_LEN);
 273                 dev->mac_specified = 1;
 274         } else {
 275                 /* ignore the wrong mac, use random mac */
 276                 PMD_DRV_LOG(ERR, "wrong format of mac: %s", mac);
 277         }
 278 }
 279
 280 static int
 281 virtio_user_dev_init_notify(struct virtio_user_dev *dev)
 282 {
 283         uint32_t i, j;
 284         int callfd;
 285         int kickfd;
 286
 287         for (i = 0; i < dev->max_queue_pairs * 2; i++) {
 288                 /* May use invalid flag, but some backend uses kickfd and
 289                  * callfd as criteria to judge if dev is alive. so finally we
 290                  * use real event_fd.
 291                  */
 292                 callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 293                 if (callfd < 0) {
 294                         PMD_DRV_LOG(ERR, "(%s) callfd error, %s", dev->path, strerror(errno));
 295                         goto err;
 296                 }
 297                 kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 298                 if (kickfd < 0) {
 299                         close(callfd);
 300                         PMD_DRV_LOG(ERR, "(%s) kickfd error, %s", dev->path, strerror(errno));
 301                         goto err;
 302                 }
 303                 dev->callfds[i] = callfd;
 304                 dev->kickfds[i] = kickfd;
 305         }
 306
 307         return 0;
 308 err:
 309         for (j = 0; j < i; j++) {
 310                 if (dev->kickfds[j] >= 0) {
 311                         close(dev->kickfds[j]);
 312                         dev->kickfds[j] = -1;
 313                 }
 314                 if (dev->callfds[j] >= 0) {
 315                         close(dev->callfds[j]);
 316                         dev->callfds[j] = -1;
 317                 }
 318         }
 319
 320         return -1;
 321 }
 322
 323 static void
 324 virtio_user_dev_uninit_notify(struct virtio_user_dev *dev)
 325 {
 326         uint32_t i;
 327
 328         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 329                 if (dev->kickfds[i] >= 0) {
 330                         close(dev->kickfds[i]);
 331                         dev->kickfds[i] = -1;
 332                 }
 333                 if (dev->callfds[i] >= 0) {
 334                         close(dev->callfds[i]);
 335                         dev->callfds[i] = -1;
 336                 }
 337         }
 338 }
 339
 340 static int
 341 virtio_user_fill_intr_handle(struct virtio_user_dev *dev)
 342 {
 343         uint32_t i;
 344         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->hw.port_id];
 345
 346         if (!eth_dev->intr_handle) {
 347                 eth_dev->intr_handle = malloc(sizeof(*eth_dev->intr_handle));
 348                 if (!eth_dev->intr_handle) {
 349                         PMD_DRV_LOG(ERR, "(%s) failed to allocate intr_handle", dev->path);
 350                         return -1;
 351                 }
 352                 memset(eth_dev->intr_handle, 0, sizeof(*eth_dev->intr_handle));
 353         }
 354
 355         for (i = 0; i < dev->max_queue_pairs; ++i)
 356                 eth_dev->intr_handle->efds[i] = dev->callfds[i];
 357         eth_dev->intr_handle->nb_efd = dev->max_queue_pairs;
 358         eth_dev->intr_handle->max_intr = dev->max_queue_pairs + 1;
 359         eth_dev->intr_handle->type = RTE_INTR_HANDLE_VDEV;
 360         /* For virtio vdev, no need to read counter for clean */
 361         eth_dev->intr_handle->efd_counter_size = 0;
 362         eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
 363
 364         return 0;
 365 }
 366
 367 static void
 368 virtio_user_mem_event_cb(enum rte_mem_event type __rte_unused,
 369                          const void *addr,
 370                          size_t len __rte_unused,
 371                          void *arg)
 372 {
 373         struct virtio_user_dev *dev = arg;
 374         struct rte_memseg_list *msl;
 375         uint16_t i;
 376         int ret = 0;
 377
 378         /* ignore externally allocated memory */
 379         msl = rte_mem_virt2memseg_list(addr);
 380         if (msl->external)
 381                 return;
 382
 383         pthread_mutex_lock(&dev->mutex);
 384
 385         if (dev->started == false)
 386                 goto exit;
 387
 388         /* Step 1: pause the active queues */
 389         for (i = 0; i < dev->queue_pairs; i++) {
 390                 ret = dev->ops->enable_qp(dev, i, 0);
 391                 if (ret < 0)
 392                         goto exit;
 393         }
 394
 395         /* Step 2: update memory regions */
 396         ret = dev->ops->set_memory_table(dev);
 397         if (ret < 0)
 398                 goto exit;
 399
 400         /* Step 3: resume the active queues */
 401         for (i = 0; i < dev->queue_pairs; i++) {
 402                 ret = dev->ops->enable_qp(dev, i, 1);
 403                 if (ret < 0)
 404                         goto exit;
 405         }
 406
 407 exit:
 408         pthread_mutex_unlock(&dev->mutex);
 409
 410         if (ret < 0)
 411                 PMD_DRV_LOG(ERR, "(%s) Failed to update memory table\n", dev->path);
 412 }
 413
 414 static int
 415 virtio_user_dev_setup(struct virtio_user_dev *dev)
 416 {
 417         if (dev->is_server) {
 418                 if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER) {
 419                         PMD_DRV_LOG(ERR, "Server mode only supports vhost-user!");
 420                         return -1;
 421                 }
 422         }
 423
 424         switch (dev->backend_type) {
 425         case VIRTIO_USER_BACKEND_VHOST_USER:
 426                 dev->ops = &virtio_ops_user;
 427                 break;
 428         case VIRTIO_USER_BACKEND_VHOST_KERNEL:
 429                 dev->ops = &virtio_ops_kernel;
 430                 break;
 431         case VIRTIO_USER_BACKEND_VHOST_VDPA:
 432                 dev->ops = &virtio_ops_vdpa;
 433                 break;
 434         default:
 435                 PMD_DRV_LOG(ERR, "(%s) Unknown backend type", dev->path);
 436                 return -1;
 437         }
 438
 439         if (dev->ops->setup(dev) < 0) {
 440                 PMD_INIT_LOG(ERR, "(%s) Failed to setup backend\n", dev->path);
 441                 return -1;
 442         }
 443
 444         if (virtio_user_dev_init_notify(dev) < 0) {
 445                 PMD_INIT_LOG(ERR, "(%s) Failed to init notifiers\n", dev->path);
 446                 goto destroy;
 447         }
 448
 449         if (virtio_user_fill_intr_handle(dev) < 0) {
 450                 PMD_INIT_LOG(ERR, "(%s) Failed to init interrupt handler\n", dev->path);
 451                 goto uninit;
 452         }
 453
 454         return 0;
 455
 456 uninit:
 457         virtio_user_dev_uninit_notify(dev);
 458 destroy:
 459         dev->ops->destroy(dev);
 460
 461         return -1;
 462 }
 463
 464 /* Use below macro to filter features from vhost backend */
 465 #define VIRTIO_USER_SUPPORTED_FEATURES                  \
 466         (1ULL << VIRTIO_NET_F_MAC               |       \
 467          1ULL << VIRTIO_NET_F_STATUS            |       \
 468          1ULL << VIRTIO_NET_F_MQ                |       \
 469          1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR     |       \
 470          1ULL << VIRTIO_NET_F_CTRL_VQ           |       \
 471          1ULL << VIRTIO_NET_F_CTRL_RX           |       \
 472          1ULL << VIRTIO_NET_F_CTRL_VLAN         |       \
 473          1ULL << VIRTIO_NET_F_CSUM              |       \
 474          1ULL << VIRTIO_NET_F_HOST_TSO4         |       \
 475          1ULL << VIRTIO_NET_F_HOST_TSO6         |       \
 476          1ULL << VIRTIO_NET_F_MRG_RXBUF         |       \
 477          1ULL << VIRTIO_RING_F_INDIRECT_DESC    |       \
 478          1ULL << VIRTIO_NET_F_GUEST_CSUM        |       \
 479          1ULL << VIRTIO_NET_F_GUEST_TSO4        |       \
 480          1ULL << VIRTIO_NET_F_GUEST_TSO6        |       \
 481          1ULL << VIRTIO_F_IN_ORDER              |       \
 482          1ULL << VIRTIO_F_VERSION_1             |       \
 483          1ULL << VIRTIO_F_RING_PACKED)
 484
 485 int
 486 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
 487                      int cq, int queue_size, const char *mac, char **ifname,
 488                      int server, int mrg_rxbuf, int in_order, int packed_vq,
 489                      enum virtio_user_backend_type backend_type)
 490 {
 491         uint64_t backend_features;
 492         int i;
 493
 494         pthread_mutex_init(&dev->mutex, NULL);
 495         strlcpy(dev->path, path, PATH_MAX);
 496
 497         for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; i++) {
 498                 dev->kickfds[i] = -1;
 499                 dev->callfds[i] = -1;
 500         }
 501
 502         dev->started = 0;
 503         dev->max_queue_pairs = queues;
 504         dev->queue_pairs = 1; /* mq disabled by default */
 505         dev->queue_size = queue_size;
 506         dev->is_server = server;
 507         dev->mac_specified = 0;
 508         dev->frontend_features = 0;
 509         dev->unsupported_features = 0;
 510         dev->backend_type = backend_type;
 511
 512         parse_mac(dev, mac);
 513
 514         if (*ifname) {
 515                 dev->ifname = *ifname;
 516                 *ifname = NULL;
 517         }
 518
 519         if (virtio_user_dev_setup(dev) < 0) {
 520                 PMD_INIT_LOG(ERR, "(%s) backend set up fails", dev->path);
 521                 return -1;
 522         }
 523
 524         if (dev->ops->set_owner(dev) < 0) {
 525                 PMD_INIT_LOG(ERR, "(%s) Failed to set backend owner", dev->path);
 526                 return -1;
 527         }
 528
 529         if (dev->ops->get_backend_features(&backend_features) < 0) {
 530                 PMD_INIT_LOG(ERR, "(%s) Failed to get backend features", dev->path);
 531                 return -1;
 532         }
 533
 534         dev->unsupported_features = ~(VIRTIO_USER_SUPPORTED_FEATURES | backend_features);
 535
 536         if (dev->ops->get_features(dev, &dev->device_features) < 0) {
 537                 PMD_INIT_LOG(ERR, "(%s) Failed to get device features", dev->path);
 538                 return -1;
 539         }
 540
 541         if (!mrg_rxbuf)
 542                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MRG_RXBUF);
 543
 544         if (!in_order)
 545                 dev->unsupported_features |= (1ull << VIRTIO_F_IN_ORDER);
 546
 547         if (!packed_vq)
 548                 dev->unsupported_features |= (1ull << VIRTIO_F_RING_PACKED);
 549
 550         if (dev->mac_specified)
 551                 dev->frontend_features |= (1ull << VIRTIO_NET_F_MAC);
 552         else
 553                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MAC);
 554
 555         if (cq) {
 556                 /* device does not really need to know anything about CQ,
 557                  * so if necessary, we just claim to support CQ
 558                  */
 559                 dev->frontend_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 560         } else {
 561                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 562                 /* Also disable features that depend on VIRTIO_NET_F_CTRL_VQ */
 563                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_RX);
 564                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VLAN);
 565                 dev->unsupported_features |=
 566                         (1ull << VIRTIO_NET_F_GUEST_ANNOUNCE);
 567                 dev->unsupported_features |= (1ull << VIRTIO_NET_F_MQ);
 568                 dev->unsupported_features |=
 569                         (1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
 570         }
 571
 572         /* The backend will not report this feature, we add it explicitly */
 573         if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER)
 574                 dev->frontend_features |= (1ull << VIRTIO_NET_F_STATUS);
 575
 576         /*
 577          * Device features =
 578          *     (frontend_features | backend_features) & ~unsupported_features;
 579          */
 580         dev->device_features |= dev->frontend_features;
 581         dev->device_features &= ~dev->unsupported_features;
 582
 583         if (rte_mem_event_callback_register(VIRTIO_USER_MEM_EVENT_CLB_NAME,
 584                                 virtio_user_mem_event_cb, dev)) {
 585                 if (rte_errno != ENOTSUP) {
 586                         PMD_INIT_LOG(ERR, "(%s) Failed to register mem event callback\n",
 587                                         dev->path);
 588                         return -1;
 589                 }
 590         }
 591
 592         return 0;
 593 }
 594
 595 void
 596 virtio_user_dev_uninit(struct virtio_user_dev *dev)
 597 {
 598         virtio_user_stop_device(dev);
 599
 600         rte_mem_event_callback_unregister(VIRTIO_USER_MEM_EVENT_CLB_NAME, dev);
 601
 602         virtio_user_dev_uninit_notify(dev);
 603
 604         free(dev->ifname);
 605
 606         if (dev->is_server)
 607                 unlink(dev->path);
 608
 609         dev->ops->destroy(dev);
 610 }
 611
 612 uint8_t
 613 virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs)
 614 {
 615         uint16_t i;
 616         uint8_t ret = 0;
 617
 618         if (q_pairs > dev->max_queue_pairs) {
 619                 PMD_INIT_LOG(ERR, "(%s) multi-q config %u, but only %u supported",
 620                              dev->path, q_pairs, dev->max_queue_pairs);
 621                 return -1;
 622         }
 623
 624         for (i = 0; i < q_pairs; ++i)
 625                 ret |= dev->ops->enable_qp(dev, i, 1);
 626         for (i = q_pairs; i < dev->max_queue_pairs; ++i)
 627                 ret |= dev->ops->enable_qp(dev, i, 0);
 628
 629         dev->queue_pairs = q_pairs;
 630
 631         return ret;
 632 }
 633
 634 static uint32_t
 635 virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring,
 636                             uint16_t idx_hdr)
 637 {
 638         struct virtio_net_ctrl_hdr *hdr;
 639         virtio_net_ctrl_ack status = ~0;
 640         uint16_t i, idx_data, idx_status;
 641         uint32_t n_descs = 0;
 642
 643         /* locate desc for header, data, and status */
 644         idx_data = vring->desc[idx_hdr].next;
 645         n_descs++;
 646
 647         i = idx_data;
 648         while (vring->desc[i].flags == VRING_DESC_F_NEXT) {
 649                 i = vring->desc[i].next;
 650                 n_descs++;
 651         }
 652
 653         /* locate desc for status */
 654         idx_status = i;
 655         n_descs++;
 656
 657         hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
 658         if (hdr->class == VIRTIO_NET_CTRL_MQ &&
 659             hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
 660                 uint16_t queues;
 661
 662                 queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr;
 663                 status = virtio_user_handle_mq(dev, queues);
 664         } else if (hdr->class == VIRTIO_NET_CTRL_RX  ||
 665                    hdr->class == VIRTIO_NET_CTRL_MAC ||
 666                    hdr->class == VIRTIO_NET_CTRL_VLAN) {
 667                 status = 0;
 668         }
 669
 670         /* Update status */
 671         *(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status;
 672
 673         return n_descs;
 674 }
 675
 676 static inline int
 677 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
 678 {
 679         uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
 680
 681         return wrap_counter == !!(flags & VRING_PACKED_DESC_F_AVAIL) &&
 682                 wrap_counter != !!(flags & VRING_PACKED_DESC_F_USED);
 683 }
 684
 685 static uint32_t
 686 virtio_user_handle_ctrl_msg_packed(struct virtio_user_dev *dev,
 687                                    struct vring_packed *vring,
 688                                    uint16_t idx_hdr)
 689 {
 690         struct virtio_net_ctrl_hdr *hdr;
 691         virtio_net_ctrl_ack status = ~0;
 692         uint16_t idx_data, idx_status;
 693         /* initialize to one, header is first */
 694         uint32_t n_descs = 1;
 695
 696         /* locate desc for header, data, and status */
 697         idx_data = idx_hdr + 1;
 698         if (idx_data >= dev->queue_size)
 699                 idx_data -= dev->queue_size;
 700
 701         n_descs++;
 702
 703         idx_status = idx_data;
 704         while (vring->desc[idx_status].flags & VRING_DESC_F_NEXT) {
 705                 idx_status++;
 706                 if (idx_status >= dev->queue_size)
 707                         idx_status -= dev->queue_size;
 708                 n_descs++;
 709         }
 710
 711         hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
 712         if (hdr->class == VIRTIO_NET_CTRL_MQ &&
 713             hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
 714                 uint16_t queues;
 715
 716                 queues = *(uint16_t *)(uintptr_t)
 717                                 vring->desc[idx_data].addr;
 718                 status = virtio_user_handle_mq(dev, queues);
 719         } else if (hdr->class == VIRTIO_NET_CTRL_RX  ||
 720                    hdr->class == VIRTIO_NET_CTRL_MAC ||
 721                    hdr->class == VIRTIO_NET_CTRL_VLAN) {
 722                 status = 0;
 723         }
 724
 725         /* Update status */
 726         *(virtio_net_ctrl_ack *)(uintptr_t)
 727                 vring->desc[idx_status].addr = status;
 728
 729         /* Update used descriptor */
 730         vring->desc[idx_hdr].id = vring->desc[idx_status].id;
 731         vring->desc[idx_hdr].len = sizeof(status);
 732
 733         return n_descs;
 734 }
 735
 736 void
 737 virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx)
 738 {
 739         struct virtio_user_queue *vq = &dev->packed_queues[queue_idx];
 740         struct vring_packed *vring = &dev->packed_vrings[queue_idx];
 741         uint16_t n_descs, flags;
 742
 743         /* Perform a load-acquire barrier in desc_is_avail to
 744          * enforce the ordering between desc flags and desc
 745          * content.
 746          */
 747         while (desc_is_avail(&vring->desc[vq->used_idx],
 748                              vq->used_wrap_counter)) {
 749
 750                 n_descs = virtio_user_handle_ctrl_msg_packed(dev, vring,
 751                                 vq->used_idx);
 752
 753                 flags = VRING_DESC_F_WRITE;
 754                 if (vq->used_wrap_counter)
 755                         flags |= VRING_PACKED_DESC_F_AVAIL_USED;
 756
 757                 __atomic_store_n(&vring->desc[vq->used_idx].flags, flags,
 758                                  __ATOMIC_RELEASE);
 759
 760                 vq->used_idx += n_descs;
 761                 if (vq->used_idx >= dev->queue_size) {
 762                         vq->used_idx -= dev->queue_size;
 763                         vq->used_wrap_counter ^= 1;
 764                 }
 765         }
 766 }
 767
 768 void
 769 virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
 770 {
 771         uint16_t avail_idx, desc_idx;
 772         struct vring_used_elem *uep;
 773         uint32_t n_descs;
 774         struct vring *vring = &dev->vrings[queue_idx];
 775
 776         /* Consume avail ring, using used ring idx as first one */
 777         while (__atomic_load_n(&vring->used->idx, __ATOMIC_RELAXED)
 778                != vring->avail->idx) {
 779                 avail_idx = __atomic_load_n(&vring->used->idx, __ATOMIC_RELAXED)
 780                             & (vring->num - 1);
 781                 desc_idx = vring->avail->ring[avail_idx];
 782
 783                 n_descs = virtio_user_handle_ctrl_msg(dev, vring, desc_idx);
 784
 785                 /* Update used ring */
 786                 uep = &vring->used->ring[avail_idx];
 787                 uep->id = desc_idx;
 788                 uep->len = n_descs;
 789
 790                 __atomic_add_fetch(&vring->used->idx, 1, __ATOMIC_RELAXED);
 791         }
 792 }
 793
 794 int
 795 virtio_user_dev_set_status(struct virtio_user_dev *dev, uint8_t status)
 796 {
 797         int ret;
 798
 799         pthread_mutex_lock(&dev->mutex);
 800         dev->status = status;
 801         ret = dev->ops->set_status(dev, status);
 802         if (ret && ret != -ENOTSUP)
 803                 PMD_INIT_LOG(ERR, "(%s) Failed to set backend status\n", dev->path);
 804
 805         pthread_mutex_unlock(&dev->mutex);
 806         return ret;
 807 }
 808
 809 int
 810 virtio_user_dev_update_status(struct virtio_user_dev *dev)
 811 {
 812         int ret;
 813         uint8_t status;
 814
 815         pthread_mutex_lock(&dev->mutex);
 816
 817         ret = dev->ops->get_status(dev, &status);
 818         if (!ret) {
 819                 dev->status = status;
 820                 PMD_INIT_LOG(DEBUG, "Updated Device Status(0x%08x):\n"
 821                         "\t-RESET: %u\n"
 822                         "\t-ACKNOWLEDGE: %u\n"
 823                         "\t-DRIVER: %u\n"
 824                         "\t-DRIVER_OK: %u\n"
 825                         "\t-FEATURES_OK: %u\n"
 826                         "\t-DEVICE_NEED_RESET: %u\n"
 827                         "\t-FAILED: %u\n",
 828                         dev->status,
 829                         (dev->status == VIRTIO_CONFIG_STATUS_RESET),
 830                         !!(dev->status & VIRTIO_CONFIG_STATUS_ACK),
 831                         !!(dev->status & VIRTIO_CONFIG_STATUS_DRIVER),
 832                         !!(dev->status & VIRTIO_CONFIG_STATUS_DRIVER_OK),
 833                         !!(dev->status & VIRTIO_CONFIG_STATUS_FEATURES_OK),
 834                         !!(dev->status & VIRTIO_CONFIG_STATUS_DEV_NEED_RESET),
 835                         !!(dev->status & VIRTIO_CONFIG_STATUS_FAILED));
 836         } else if (ret != -ENOTSUP) {
 837                 PMD_INIT_LOG(ERR, "(%s) Failed to get backend status\n", dev->path);
 838         }
 839
 840         pthread_mutex_unlock(&dev->mutex);
 841         return ret;
 842 }
 843
 844 int
 845 virtio_user_dev_update_link_state(struct virtio_user_dev *dev)
 846 {
 847         if (dev->ops->update_link_state)
 848                 return dev->ops->update_link_state(dev);
 849
 850         return 0;
 851 }
 852
 853 static void
 854 virtio_user_dev_reset_queues_packed(struct rte_eth_dev *eth_dev)
 855 {
 856         struct virtio_user_dev *dev = eth_dev->data->dev_private;
 857         struct virtio_hw *hw = &dev->hw;
 858         struct virtnet_rx *rxvq;
 859         struct virtnet_tx *txvq;
 860         uint16_t i;
 861
 862         /* Add lock to avoid queue contention. */
 863         rte_spinlock_lock(&hw->state_lock);
 864         hw->started = 0;
 865
 866         /*
 867          * Waiting for datapath to complete before resetting queues.
 868          * 1 ms should be enough for the ongoing Tx/Rx function to finish.
 869          */
 870         rte_delay_ms(1);
 871
 872         /* Vring reset for each Tx queue and Rx queue. */
 873         for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 874                 rxvq = eth_dev->data->rx_queues[i];
 875                 virtqueue_rxvq_reset_packed(virtnet_rxq_to_vq(rxvq));
 876                 virtio_dev_rx_queue_setup_finish(eth_dev, i);
 877         }
 878
 879         for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 880                 txvq = eth_dev->data->tx_queues[i];
 881                 virtqueue_txvq_reset_packed(virtnet_txq_to_vq(txvq));
 882         }
 883
 884         hw->started = 1;
 885         rte_spinlock_unlock(&hw->state_lock);
 886 }
 887
 888 void
 889 virtio_user_dev_delayed_disconnect_handler(void *param)
 890 {
 891         struct virtio_user_dev *dev = param;
 892         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->hw.port_id];
 893
 894         if (rte_intr_disable(eth_dev->intr_handle) < 0) {
 895                 PMD_DRV_LOG(ERR, "interrupt disable failed");
 896                 return;
 897         }
 898         PMD_DRV_LOG(DEBUG, "Unregistering intr fd: %d",
 899                     eth_dev->intr_handle->fd);
 900         if (rte_intr_callback_unregister(eth_dev->intr_handle,
 901                                          virtio_interrupt_handler,
 902                                          eth_dev) != 1)
 903                 PMD_DRV_LOG(ERR, "interrupt unregister failed");
 904
 905         if (dev->is_server) {
 906                 if (dev->ops->server_disconnect)
 907                         dev->ops->server_disconnect(dev);
 908
 909                 eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
 910
 911                 PMD_DRV_LOG(DEBUG, "Registering intr fd: %d",
 912                             eth_dev->intr_handle->fd);
 913
 914                 if (rte_intr_callback_register(eth_dev->intr_handle,
 915                                                virtio_interrupt_handler,
 916                                                eth_dev))
 917                         PMD_DRV_LOG(ERR, "interrupt register failed");
 918
 919                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
 920                         PMD_DRV_LOG(ERR, "interrupt enable failed");
 921                         return;
 922                 }
 923         }
 924 }
 925
 926 static void
 927 virtio_user_dev_delayed_intr_reconfig_handler(void *param)
 928 {
 929         struct virtio_user_dev *dev = param;
 930         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->hw.port_id];
 931
 932         PMD_DRV_LOG(DEBUG, "Unregistering intr fd: %d",
 933                     eth_dev->intr_handle->fd);
 934
 935         if (rte_intr_callback_unregister(eth_dev->intr_handle,
 936                                          virtio_interrupt_handler,
 937                                          eth_dev) != 1)
 938                 PMD_DRV_LOG(ERR, "interrupt unregister failed");
 939
 940         eth_dev->intr_handle->fd = dev->ops->get_intr_fd(dev);
 941
 942         PMD_DRV_LOG(DEBUG, "Registering intr fd: %d", eth_dev->intr_handle->fd);
 943
 944         if (rte_intr_callback_register(eth_dev->intr_handle,
 945                                        virtio_interrupt_handler, eth_dev))
 946                 PMD_DRV_LOG(ERR, "interrupt register failed");
 947
 948         if (rte_intr_enable(eth_dev->intr_handle) < 0)
 949                 PMD_DRV_LOG(ERR, "interrupt enable failed");
 950 }
 951
 952 int
 953 virtio_user_dev_server_reconnect(struct virtio_user_dev *dev)
 954 {
 955         int ret, old_status;
 956         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->hw.port_id];
 957         struct virtio_hw *hw = &dev->hw;
 958
 959         if (!dev->ops->server_reconnect) {
 960                 PMD_DRV_LOG(ERR, "(%s) Missing server reconnect callback", dev->path);
 961                 return -1;
 962         }
 963
 964         if (dev->ops->server_reconnect(dev)) {
 965                 PMD_DRV_LOG(ERR, "(%s) Reconnect callback call failed", dev->path);
 966                 return -1;
 967         }
 968
 969         old_status = dev->status;
 970
 971         virtio_reset(hw);
 972
 973         virtio_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 974
 975         virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 976
 977         if (dev->ops->get_features(dev, &dev->device_features) < 0) {
 978                 PMD_INIT_LOG(ERR, "get_features failed: %s",
 979                              strerror(errno));
 980                 return -1;
 981         }
 982
 983         dev->device_features |= dev->frontend_features;
 984
 985         /* unmask vhost-user unsupported features */
 986         dev->device_features &= ~(dev->unsupported_features);
 987
 988         dev->features &= dev->device_features;
 989
 990         /* For packed ring, resetting queues is required in reconnection. */
 991         if (virtio_with_packed_queue(hw) &&
 992            (old_status & VIRTIO_CONFIG_STATUS_DRIVER_OK)) {
 993                 PMD_INIT_LOG(NOTICE, "Packets on the fly will be dropped"
 994                                 " when packed ring reconnecting.");
 995                 virtio_user_dev_reset_queues_packed(eth_dev);
 996         }
 997
 998         virtio_set_status(hw, VIRTIO_CONFIG_STATUS_FEATURES_OK);
 999
1000         /* Start the device */
1001         virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
1002         if (!dev->started)
1003                 return -1;
1004
1005         if (dev->queue_pairs > 1) {
1006                 ret = virtio_user_handle_mq(dev, dev->queue_pairs);
1007                 if (ret != 0) {
1008                         PMD_INIT_LOG(ERR, "Fails to enable multi-queue pairs!");
1009                         return -1;
1010                 }
1011         }
1012         if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) {
1013                 if (rte_intr_disable(eth_dev->intr_handle) < 0) {
1014                         PMD_DRV_LOG(ERR, "interrupt disable failed");
1015                         return -1;
1016                 }
1017                 /*
1018                  * This function can be called from the interrupt handler, so
1019                  * we can't unregister interrupt handler here.  Setting
1020                  * alarm to do that later.
1021                  */
1022                 rte_eal_alarm_set(1,
1023                         virtio_user_dev_delayed_intr_reconfig_handler,
1024                         (void *)dev);
1025         }
1026         PMD_INIT_LOG(NOTICE, "server mode virtio-user reconnection succeeds!");
1027         return 0;
1028 }