lib/librte_vhost/vhost_user.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 <stdlib.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <sys/mman.h>
  11 #include <sys/types.h>
  12 #include <sys/stat.h>
  13 #include <assert.h>
  14 #ifdef RTE_LIBRTE_VHOST_NUMA
  15 #include <numaif.h>
  16 #endif
  17
  18 #include <rte_common.h>
  19 #include <rte_malloc.h>
  20 #include <rte_log.h>
  21
  22 #include "iotlb.h"
  23 #include "vhost.h"
  24 #include "vhost_user.h"
  25
  26 #define VIRTIO_MIN_MTU 68
  27 #define VIRTIO_MAX_MTU 65535
  28
  29 static const char *vhost_message_str[VHOST_USER_MAX] = {
  30         [VHOST_USER_NONE] = "VHOST_USER_NONE",
  31         [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
  32         [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
  33         [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
  34         [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
  35         [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
  36         [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
  37         [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
  38         [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
  39         [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
  40         [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
  41         [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
  42         [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
  43         [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
  44         [VHOST_USER_SET_VRING_ERR]  = "VHOST_USER_SET_VRING_ERR",
  45         [VHOST_USER_GET_PROTOCOL_FEATURES]  = "VHOST_USER_GET_PROTOCOL_FEATURES",
  46         [VHOST_USER_SET_PROTOCOL_FEATURES]  = "VHOST_USER_SET_PROTOCOL_FEATURES",
  47         [VHOST_USER_GET_QUEUE_NUM]  = "VHOST_USER_GET_QUEUE_NUM",
  48         [VHOST_USER_SET_VRING_ENABLE]  = "VHOST_USER_SET_VRING_ENABLE",
  49         [VHOST_USER_SEND_RARP]  = "VHOST_USER_SEND_RARP",
  50         [VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
  51         [VHOST_USER_SET_SLAVE_REQ_FD]  = "VHOST_USER_SET_SLAVE_REQ_FD",
  52         [VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
  53 };
  54
  55 static uint64_t
  56 get_blk_size(int fd)
  57 {
  58         struct stat stat;
  59         int ret;
  60
  61         ret = fstat(fd, &stat);
  62         return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
  63 }
  64
  65 static void
  66 free_mem_region(struct virtio_net *dev)
  67 {
  68         uint32_t i;
  69         struct rte_vhost_mem_region *reg;
  70
  71         if (!dev || !dev->mem)
  72                 return;
  73
  74         for (i = 0; i < dev->mem->nregions; i++) {
  75                 reg = &dev->mem->regions[i];
  76                 if (reg->host_user_addr) {
  77                         munmap(reg->mmap_addr, reg->mmap_size);
  78                         close(reg->fd);
  79                 }
  80         }
  81 }
  82
  83 void
  84 vhost_backend_cleanup(struct virtio_net *dev)
  85 {
  86         if (dev->mem) {
  87                 free_mem_region(dev);
  88                 rte_free(dev->mem);
  89                 dev->mem = NULL;
  90         }
  91
  92         free(dev->guest_pages);
  93         dev->guest_pages = NULL;
  94
  95         if (dev->log_addr) {
  96                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
  97                 dev->log_addr = 0;
  98         }
  99
 100         if (dev->slave_req_fd >= 0) {
 101                 close(dev->slave_req_fd);
 102                 dev->slave_req_fd = -1;
 103         }
 104 }
 105
 106 /*
 107  * This function just returns success at the moment unless
 108  * the device hasn't been initialised.
 109  */
 110 static int
 111 vhost_user_set_owner(void)
 112 {
 113         return 0;
 114 }
 115
 116 static int
 117 vhost_user_reset_owner(struct virtio_net *dev)
 118 {
 119         if (dev->flags & VIRTIO_DEV_RUNNING) {
 120                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 121                 dev->notify_ops->destroy_device(dev->vid);
 122         }
 123
 124         cleanup_device(dev, 0);
 125         reset_device(dev);
 126         return 0;
 127 }
 128
 129 /*
 130  * The features that we support are requested.
 131  */
 132 static uint64_t
 133 vhost_user_get_features(struct virtio_net *dev)
 134 {
 135         uint64_t features = 0;
 136
 137         rte_vhost_driver_get_features(dev->ifname, &features);
 138         return features;
 139 }
 140
 141 /*
 142  * We receive the negotiated features supported by us and the virtio device.
 143  */
 144 static int
 145 vhost_user_set_features(struct virtio_net *dev, uint64_t features)
 146 {
 147         uint64_t vhost_features = 0;
 148
 149         rte_vhost_driver_get_features(dev->ifname, &vhost_features);
 150         if (features & ~vhost_features) {
 151                 RTE_LOG(ERR, VHOST_CONFIG,
 152                         "(%d) received invalid negotiated features.\n",
 153                         dev->vid);
 154                 return -1;
 155         }
 156
 157         if (dev->flags & VIRTIO_DEV_RUNNING) {
 158                 if (dev->features == features)
 159                         return 0;
 160
 161                 /*
 162                  * Error out if master tries to change features while device is
 163                  * in running state. The exception being VHOST_F_LOG_ALL, which
 164                  * is enabled when the live-migration starts.
 165                  */
 166                 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) {
 167                         RTE_LOG(ERR, VHOST_CONFIG,
 168                                 "(%d) features changed while device is running.\n",
 169                                 dev->vid);
 170                         return -1;
 171                 }
 172
 173                 if (dev->notify_ops->features_changed)
 174                         dev->notify_ops->features_changed(dev->vid, features);
 175         }
 176
 177         dev->features = features;
 178         if (dev->features &
 179                 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
 180                 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 181         } else {
 182                 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
 183         }
 184         LOG_DEBUG(VHOST_CONFIG,
 185                 "(%d) mergeable RX buffers %s, virtio 1 %s\n",
 186                 dev->vid,
 187                 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
 188                 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 189
 190         if (!(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
 191                 /*
 192                  * Remove all but first queue pair if MQ hasn't been
 193                  * negotiated. This is safe because the device is not
 194                  * running at this stage.
 195                  */
 196                 while (dev->nr_vring > 2) {
 197                         struct vhost_virtqueue *vq;
 198
 199                         vq = dev->virtqueue[--dev->nr_vring];
 200                         if (!vq)
 201                                 continue;
 202
 203                         dev->virtqueue[dev->nr_vring] = NULL;
 204                         cleanup_vq(vq, 1);
 205                         free_vq(vq);
 206                 }
 207         }
 208
 209         return 0;
 210 }
 211
 212 /*
 213  * The virtio device sends us the size of the descriptor ring.
 214  */
 215 static int
 216 vhost_user_set_vring_num(struct virtio_net *dev,
 217                          VhostUserMsg *msg)
 218 {
 219         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 220
 221         vq->size = msg->payload.state.num;
 222
 223         if (dev->dequeue_zero_copy) {
 224                 vq->nr_zmbuf = 0;
 225                 vq->last_zmbuf_idx = 0;
 226                 vq->zmbuf_size = vq->size;
 227                 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
 228                                          sizeof(struct zcopy_mbuf), 0);
 229                 if (vq->zmbufs == NULL) {
 230                         RTE_LOG(WARNING, VHOST_CONFIG,
 231                                 "failed to allocate mem for zero copy; "
 232                                 "zero copy is force disabled\n");
 233                         dev->dequeue_zero_copy = 0;
 234                 }
 235         }
 236
 237         vq->shadow_used_ring = rte_malloc(NULL,
 238                                 vq->size * sizeof(struct vring_used_elem),
 239                                 RTE_CACHE_LINE_SIZE);
 240         if (!vq->shadow_used_ring) {
 241                 RTE_LOG(ERR, VHOST_CONFIG,
 242                         "failed to allocate memory for shadow used ring.\n");
 243                 return -1;
 244         }
 245
 246         vq->batch_copy_elems = rte_malloc(NULL,
 247                                 vq->size * sizeof(struct batch_copy_elem),
 248                                 RTE_CACHE_LINE_SIZE);
 249         if (!vq->batch_copy_elems) {
 250                 RTE_LOG(ERR, VHOST_CONFIG,
 251                         "failed to allocate memory for batching copy.\n");
 252                 return -1;
 253         }
 254
 255         return 0;
 256 }
 257
 258 /*
 259  * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
 260  * same numa node as the memory of vring descriptor.
 261  */
 262 #ifdef RTE_LIBRTE_VHOST_NUMA
 263 static struct virtio_net*
 264 numa_realloc(struct virtio_net *dev, int index)
 265 {
 266         int oldnode, newnode;
 267         struct virtio_net *old_dev;
 268         struct vhost_virtqueue *old_vq, *vq;
 269         int ret;
 270
 271         old_dev = dev;
 272         vq = old_vq = dev->virtqueue[index];
 273
 274         ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
 275                             MPOL_F_NODE | MPOL_F_ADDR);
 276
 277         /* check if we need to reallocate vq */
 278         ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
 279                              MPOL_F_NODE | MPOL_F_ADDR);
 280         if (ret) {
 281                 RTE_LOG(ERR, VHOST_CONFIG,
 282                         "Unable to get vq numa information.\n");
 283                 return dev;
 284         }
 285         if (oldnode != newnode) {
 286                 RTE_LOG(INFO, VHOST_CONFIG,
 287                         "reallocate vq from %d to %d node\n", oldnode, newnode);
 288                 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
 289                 if (!vq)
 290                         return dev;
 291
 292                 memcpy(vq, old_vq, sizeof(*vq));
 293                 rte_free(old_vq);
 294         }
 295
 296         /* check if we need to reallocate dev */
 297         ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
 298                             MPOL_F_NODE | MPOL_F_ADDR);
 299         if (ret) {
 300                 RTE_LOG(ERR, VHOST_CONFIG,
 301                         "Unable to get dev numa information.\n");
 302                 goto out;
 303         }
 304         if (oldnode != newnode) {
 305                 RTE_LOG(INFO, VHOST_CONFIG,
 306                         "reallocate dev from %d to %d node\n",
 307                         oldnode, newnode);
 308                 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
 309                 if (!dev) {
 310                         dev = old_dev;
 311                         goto out;
 312                 }
 313
 314                 memcpy(dev, old_dev, sizeof(*dev));
 315                 rte_free(old_dev);
 316         }
 317
 318 out:
 319         dev->virtqueue[index] = vq;
 320         vhost_devices[dev->vid] = dev;
 321
 322         if (old_vq != vq)
 323                 vhost_user_iotlb_init(dev, index);
 324
 325         return dev;
 326 }
 327 #else
 328 static struct virtio_net*
 329 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 330 {
 331         return dev;
 332 }
 333 #endif
 334
 335 /* Converts QEMU virtual address to Vhost virtual address. */
 336 static uint64_t
 337 qva_to_vva(struct virtio_net *dev, uint64_t qva)
 338 {
 339         struct rte_vhost_mem_region *reg;
 340         uint32_t i;
 341
 342         /* Find the region where the address lives. */
 343         for (i = 0; i < dev->mem->nregions; i++) {
 344                 reg = &dev->mem->regions[i];
 345
 346                 if (qva >= reg->guest_user_addr &&
 347                     qva <  reg->guest_user_addr + reg->size) {
 348                         return qva - reg->guest_user_addr +
 349                                reg->host_user_addr;
 350                 }
 351         }
 352
 353         return 0;
 354 }
 355
 356
 357 /*
 358  * Converts ring address to Vhost virtual address.
 359  * If IOMMU is enabled, the ring address is a guest IO virtual address,
 360  * else it is a QEMU virtual address.
 361  */
 362 static uint64_t
 363 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 364                 uint64_t ra, uint64_t size)
 365 {
 366         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 367                 uint64_t vva;
 368
 369                 vva = vhost_user_iotlb_cache_find(vq, ra,
 370                                         &size, VHOST_ACCESS_RW);
 371                 if (!vva)
 372                         vhost_user_iotlb_miss(dev, ra, VHOST_ACCESS_RW);
 373
 374                 return vva;
 375         }
 376
 377         return qva_to_vva(dev, ra);
 378 }
 379
 380 static struct virtio_net *
 381 translate_ring_addresses(struct virtio_net *dev, int vq_index)
 382 {
 383         struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 384         struct vhost_vring_addr *addr = &vq->ring_addrs;
 385
 386         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 387         if (vq->desc && vq->avail && vq->used)
 388                 return dev;
 389
 390         vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
 391                         vq, addr->desc_user_addr, sizeof(struct vring_desc));
 392         if (vq->desc == 0) {
 393                 RTE_LOG(DEBUG, VHOST_CONFIG,
 394                         "(%d) failed to find desc ring address.\n",
 395                         dev->vid);
 396                 return dev;
 397         }
 398
 399         dev = numa_realloc(dev, vq_index);
 400         vq = dev->virtqueue[vq_index];
 401         addr = &vq->ring_addrs;
 402
 403         vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
 404                         vq, addr->avail_user_addr, sizeof(struct vring_avail));
 405         if (vq->avail == 0) {
 406                 RTE_LOG(DEBUG, VHOST_CONFIG,
 407                         "(%d) failed to find avail ring address.\n",
 408                         dev->vid);
 409                 return dev;
 410         }
 411
 412         vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
 413                         vq, addr->used_user_addr, sizeof(struct vring_used));
 414         if (vq->used == 0) {
 415                 RTE_LOG(DEBUG, VHOST_CONFIG,
 416                         "(%d) failed to find used ring address.\n",
 417                         dev->vid);
 418                 return dev;
 419         }
 420
 421         if (vq->last_used_idx != vq->used->idx) {
 422                 RTE_LOG(WARNING, VHOST_CONFIG,
 423                         "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
 424                         "some packets maybe resent for Tx and dropped for Rx\n",
 425                         vq->last_used_idx, vq->used->idx);
 426                 vq->last_used_idx  = vq->used->idx;
 427                 vq->last_avail_idx = vq->used->idx;
 428         }
 429
 430         vq->log_guest_addr = addr->log_guest_addr;
 431
 432         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
 433                         dev->vid, vq->desc);
 434         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n",
 435                         dev->vid, vq->avail);
 436         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n",
 437                         dev->vid, vq->used);
 438         LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
 439                         dev->vid, vq->log_guest_addr);
 440
 441         return dev;
 442 }
 443
 444 /*
 445  * The virtio device sends us the desc, used and avail ring addresses.
 446  * This function then converts these to our address space.
 447  */
 448 static int
 449 vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
 450 {
 451         struct vhost_virtqueue *vq;
 452         struct vhost_vring_addr *addr = &msg->payload.addr;
 453         struct virtio_net *dev = *pdev;
 454
 455         if (dev->mem == NULL)
 456                 return -1;
 457
 458         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 459         vq = dev->virtqueue[msg->payload.addr.index];
 460
 461         /*
 462          * Rings addresses should not be interpreted as long as the ring is not
 463          * started and enabled
 464          */
 465         memcpy(&vq->ring_addrs, addr, sizeof(*addr));
 466
 467         vring_invalidate(dev, vq);
 468
 469         if (vq->enabled && (dev->features &
 470                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
 471                 dev = translate_ring_addresses(dev, msg->payload.state.index);
 472                 if (!dev)
 473                         return -1;
 474
 475                 *pdev = dev;
 476         }
 477
 478         return 0;
 479 }
 480
 481 /*
 482  * The virtio device sends us the available ring last used index.
 483  */
 484 static int
 485 vhost_user_set_vring_base(struct virtio_net *dev,
 486                           VhostUserMsg *msg)
 487 {
 488         dev->virtqueue[msg->payload.state.index]->last_used_idx  =
 489                         msg->payload.state.num;
 490         dev->virtqueue[msg->payload.state.index]->last_avail_idx =
 491                         msg->payload.state.num;
 492
 493         return 0;
 494 }
 495
 496 static void
 497 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 498                    uint64_t host_phys_addr, uint64_t size)
 499 {
 500         struct guest_page *page, *last_page;
 501
 502         if (dev->nr_guest_pages == dev->max_guest_pages) {
 503                 dev->max_guest_pages *= 2;
 504                 dev->guest_pages = realloc(dev->guest_pages,
 505                                         dev->max_guest_pages * sizeof(*page));
 506         }
 507
 508         if (dev->nr_guest_pages > 0) {
 509                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
 510                 /* merge if the two pages are continuous */
 511                 if (host_phys_addr == last_page->host_phys_addr +
 512                                       last_page->size) {
 513                         last_page->size += size;
 514                         return;
 515                 }
 516         }
 517
 518         page = &dev->guest_pages[dev->nr_guest_pages++];
 519         page->guest_phys_addr = guest_phys_addr;
 520         page->host_phys_addr  = host_phys_addr;
 521         page->size = size;
 522 }
 523
 524 static void
 525 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
 526                 uint64_t page_size)
 527 {
 528         uint64_t reg_size = reg->size;
 529         uint64_t host_user_addr  = reg->host_user_addr;
 530         uint64_t guest_phys_addr = reg->guest_phys_addr;
 531         uint64_t host_phys_addr;
 532         uint64_t size;
 533
 534         host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
 535         size = page_size - (guest_phys_addr & (page_size - 1));
 536         size = RTE_MIN(size, reg_size);
 537
 538         add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
 539         host_user_addr  += size;
 540         guest_phys_addr += size;
 541         reg_size -= size;
 542
 543         while (reg_size > 0) {
 544                 size = RTE_MIN(reg_size, page_size);
 545                 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
 546                                                   host_user_addr);
 547                 add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
 548
 549                 host_user_addr  += size;
 550                 guest_phys_addr += size;
 551                 reg_size -= size;
 552         }
 553 }
 554
 555 #ifdef RTE_LIBRTE_VHOST_DEBUG
 556 /* TODO: enable it only in debug mode? */
 557 static void
 558 dump_guest_pages(struct virtio_net *dev)
 559 {
 560         uint32_t i;
 561         struct guest_page *page;
 562
 563         for (i = 0; i < dev->nr_guest_pages; i++) {
 564                 page = &dev->guest_pages[i];
 565
 566                 RTE_LOG(INFO, VHOST_CONFIG,
 567                         "guest physical page region %u\n"
 568                         "\t guest_phys_addr: %" PRIx64 "\n"
 569                         "\t host_phys_addr : %" PRIx64 "\n"
 570                         "\t size           : %" PRIx64 "\n",
 571                         i,
 572                         page->guest_phys_addr,
 573                         page->host_phys_addr,
 574                         page->size);
 575         }
 576 }
 577 #else
 578 #define dump_guest_pages(dev)
 579 #endif
 580
 581 static bool
 582 vhost_memory_changed(struct VhostUserMemory *new,
 583                      struct rte_vhost_memory *old)
 584 {
 585         uint32_t i;
 586
 587         if (new->nregions != old->nregions)
 588                 return true;
 589
 590         for (i = 0; i < new->nregions; ++i) {
 591                 VhostUserMemoryRegion *new_r = &new->regions[i];
 592                 struct rte_vhost_mem_region *old_r = &old->regions[i];
 593
 594                 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
 595                         return true;
 596                 if (new_r->memory_size != old_r->size)
 597                         return true;
 598                 if (new_r->userspace_addr != old_r->guest_user_addr)
 599                         return true;
 600         }
 601
 602         return false;
 603 }
 604
 605 static int
 606 vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 607 {
 608         struct VhostUserMemory memory = pmsg->payload.memory;
 609         struct rte_vhost_mem_region *reg;
 610         void *mmap_addr;
 611         uint64_t mmap_size;
 612         uint64_t mmap_offset;
 613         uint64_t alignment;
 614         uint32_t i;
 615         int fd;
 616
 617         if (dev->mem && !vhost_memory_changed(&memory, dev->mem)) {
 618                 RTE_LOG(INFO, VHOST_CONFIG,
 619                         "(%d) memory regions not changed\n", dev->vid);
 620
 621                 for (i = 0; i < memory.nregions; i++)
 622                         close(pmsg->fds[i]);
 623
 624                 return 0;
 625         }
 626
 627         if (dev->mem) {
 628                 free_mem_region(dev);
 629                 rte_free(dev->mem);
 630                 dev->mem = NULL;
 631         }
 632
 633         dev->nr_guest_pages = 0;
 634         if (!dev->guest_pages) {
 635                 dev->max_guest_pages = 8;
 636                 dev->guest_pages = malloc(dev->max_guest_pages *
 637                                                 sizeof(struct guest_page));
 638                 if (dev->guest_pages == NULL) {
 639                         RTE_LOG(ERR, VHOST_CONFIG,
 640                                 "(%d) failed to allocate memory "
 641                                 "for dev->guest_pages\n",
 642                                 dev->vid);
 643                         return -1;
 644                 }
 645         }
 646
 647         dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
 648                 sizeof(struct rte_vhost_mem_region) * memory.nregions, 0);
 649         if (dev->mem == NULL) {
 650                 RTE_LOG(ERR, VHOST_CONFIG,
 651                         "(%d) failed to allocate memory for dev->mem\n",
 652                         dev->vid);
 653                 return -1;
 654         }
 655         dev->mem->nregions = memory.nregions;
 656
 657         for (i = 0; i < memory.nregions; i++) {
 658                 fd  = pmsg->fds[i];
 659                 reg = &dev->mem->regions[i];
 660
 661                 reg->guest_phys_addr = memory.regions[i].guest_phys_addr;
 662                 reg->guest_user_addr = memory.regions[i].userspace_addr;
 663                 reg->size            = memory.regions[i].memory_size;
 664                 reg->fd              = fd;
 665
 666                 mmap_offset = memory.regions[i].mmap_offset;
 667                 mmap_size   = reg->size + mmap_offset;
 668
 669                 /* mmap() without flag of MAP_ANONYMOUS, should be called
 670                  * with length argument aligned with hugepagesz at older
 671                  * longterm version Linux, like 2.6.32 and 3.2.72, or
 672                  * mmap() will fail with EINVAL.
 673                  *
 674                  * to avoid failure, make sure in caller to keep length
 675                  * aligned.
 676                  */
 677                 alignment = get_blk_size(fd);
 678                 if (alignment == (uint64_t)-1) {
 679                         RTE_LOG(ERR, VHOST_CONFIG,
 680                                 "couldn't get hugepage size through fstat\n");
 681                         goto err_mmap;
 682                 }
 683                 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
 684
 685                 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
 686                                  MAP_SHARED | MAP_POPULATE, fd, 0);
 687
 688                 if (mmap_addr == MAP_FAILED) {
 689                         RTE_LOG(ERR, VHOST_CONFIG,
 690                                 "mmap region %u failed.\n", i);
 691                         goto err_mmap;
 692                 }
 693
 694                 reg->mmap_addr = mmap_addr;
 695                 reg->mmap_size = mmap_size;
 696                 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
 697                                       mmap_offset;
 698
 699                 if (dev->dequeue_zero_copy)
 700                         add_guest_pages(dev, reg, alignment);
 701
 702                 RTE_LOG(INFO, VHOST_CONFIG,
 703                         "guest memory region %u, size: 0x%" PRIx64 "\n"
 704                         "\t guest physical addr: 0x%" PRIx64 "\n"
 705                         "\t guest virtual  addr: 0x%" PRIx64 "\n"
 706                         "\t host  virtual  addr: 0x%" PRIx64 "\n"
 707                         "\t mmap addr : 0x%" PRIx64 "\n"
 708                         "\t mmap size : 0x%" PRIx64 "\n"
 709                         "\t mmap align: 0x%" PRIx64 "\n"
 710                         "\t mmap off  : 0x%" PRIx64 "\n",
 711                         i, reg->size,
 712                         reg->guest_phys_addr,
 713                         reg->guest_user_addr,
 714                         reg->host_user_addr,
 715                         (uint64_t)(uintptr_t)mmap_addr,
 716                         mmap_size,
 717                         alignment,
 718                         mmap_offset);
 719         }
 720
 721         dump_guest_pages(dev);
 722
 723         return 0;
 724
 725 err_mmap:
 726         free_mem_region(dev);
 727         rte_free(dev->mem);
 728         dev->mem = NULL;
 729         return -1;
 730 }
 731
 732 static int
 733 vq_is_ready(struct vhost_virtqueue *vq)
 734 {
 735         return vq && vq->desc && vq->avail && vq->used &&
 736                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
 737                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
 738 }
 739
 740 static int
 741 virtio_is_ready(struct virtio_net *dev)
 742 {
 743         struct vhost_virtqueue *vq;
 744         uint32_t i;
 745
 746         if (dev->nr_vring == 0)
 747                 return 0;
 748
 749         for (i = 0; i < dev->nr_vring; i++) {
 750                 vq = dev->virtqueue[i];
 751
 752                 if (!vq_is_ready(vq))
 753                         return 0;
 754         }
 755
 756         RTE_LOG(INFO, VHOST_CONFIG,
 757                 "virtio is now ready for processing.\n");
 758         return 1;
 759 }
 760
 761 static void
 762 vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 763 {
 764         struct vhost_vring_file file;
 765         struct vhost_virtqueue *vq;
 766
 767         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
 768         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
 769                 file.fd = VIRTIO_INVALID_EVENTFD;
 770         else
 771                 file.fd = pmsg->fds[0];
 772         RTE_LOG(INFO, VHOST_CONFIG,
 773                 "vring call idx:%d file:%d\n", file.index, file.fd);
 774
 775         vq = dev->virtqueue[file.index];
 776         if (vq->callfd >= 0)
 777                 close(vq->callfd);
 778
 779         vq->callfd = file.fd;
 780 }
 781
 782 static void
 783 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *pmsg)
 784 {
 785         struct vhost_vring_file file;
 786         struct vhost_virtqueue *vq;
 787         struct virtio_net *dev = *pdev;
 788
 789         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
 790         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
 791                 file.fd = VIRTIO_INVALID_EVENTFD;
 792         else
 793                 file.fd = pmsg->fds[0];
 794         RTE_LOG(INFO, VHOST_CONFIG,
 795                 "vring kick idx:%d file:%d\n", file.index, file.fd);
 796
 797         /* Interpret ring addresses only when ring is started. */
 798         dev = translate_ring_addresses(dev, file.index);
 799         if (!dev)
 800                 return;
 801
 802         *pdev = dev;
 803
 804         vq = dev->virtqueue[file.index];
 805
 806         /*
 807          * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
 808          * the ring starts already enabled. Otherwise, it is enabled via
 809          * the SET_VRING_ENABLE message.
 810          */
 811         if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)))
 812                 vq->enabled = 1;
 813
 814         if (vq->kickfd >= 0)
 815                 close(vq->kickfd);
 816         vq->kickfd = file.fd;
 817 }
 818
 819 static void
 820 free_zmbufs(struct vhost_virtqueue *vq)
 821 {
 822         struct zcopy_mbuf *zmbuf, *next;
 823
 824         for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
 825              zmbuf != NULL; zmbuf = next) {
 826                 next = TAILQ_NEXT(zmbuf, next);
 827
 828                 rte_pktmbuf_free(zmbuf->mbuf);
 829                 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
 830         }
 831
 832         rte_free(vq->zmbufs);
 833 }
 834
 835 /*
 836  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
 837  */
 838 static int
 839 vhost_user_get_vring_base(struct virtio_net *dev,
 840                           VhostUserMsg *msg)
 841 {
 842         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 843
 844         /* We have to stop the queue (virtio) if it is running. */
 845         if (dev->flags & VIRTIO_DEV_RUNNING) {
 846                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 847                 dev->notify_ops->destroy_device(dev->vid);
 848         }
 849
 850         dev->flags &= ~VIRTIO_DEV_READY;
 851
 852         /* Here we are safe to get the last used index */
 853         msg->payload.state.num = vq->last_used_idx;
 854
 855         RTE_LOG(INFO, VHOST_CONFIG,
 856                 "vring base idx:%d file:%d\n", msg->payload.state.index,
 857                 msg->payload.state.num);
 858         /*
 859          * Based on current qemu vhost-user implementation, this message is
 860          * sent and only sent in vhost_vring_stop.
 861          * TODO: cleanup the vring, it isn't usable since here.
 862          */
 863         if (vq->kickfd >= 0)
 864                 close(vq->kickfd);
 865
 866         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 867
 868         if (dev->dequeue_zero_copy)
 869                 free_zmbufs(vq);
 870         rte_free(vq->shadow_used_ring);
 871         vq->shadow_used_ring = NULL;
 872
 873         rte_free(vq->batch_copy_elems);
 874         vq->batch_copy_elems = NULL;
 875
 876         return 0;
 877 }
 878
 879 /*
 880  * when virtio queues are ready to work, qemu will send us to
 881  * enable the virtio queue pair.
 882  */
 883 static int
 884 vhost_user_set_vring_enable(struct virtio_net *dev,
 885                             VhostUserMsg *msg)
 886 {
 887         int enable = (int)msg->payload.state.num;
 888
 889         RTE_LOG(INFO, VHOST_CONFIG,
 890                 "set queue enable: %d to qp idx: %d\n",
 891                 enable, msg->payload.state.index);
 892
 893         if (dev->notify_ops->vring_state_changed)
 894                 dev->notify_ops->vring_state_changed(dev->vid,
 895                                 msg->payload.state.index, enable);
 896
 897         dev->virtqueue[msg->payload.state.index]->enabled = enable;
 898
 899         return 0;
 900 }
 901
 902 static void
 903 vhost_user_get_protocol_features(struct virtio_net *dev,
 904                                  struct VhostUserMsg *msg)
 905 {
 906         uint64_t features, protocol_features = VHOST_USER_PROTOCOL_FEATURES;
 907
 908         rte_vhost_driver_get_features(dev->ifname, &features);
 909
 910         /*
 911          * REPLY_ACK protocol feature is only mandatory for now
 912          * for IOMMU feature. If IOMMU is explicitly disabled by the
 913          * application, disable also REPLY_ACK feature for older buggy
 914          * Qemu versions (from v2.7.0 to v2.9.0).
 915          */
 916         if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
 917                 protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK);
 918
 919         msg->payload.u64 = protocol_features;
 920         msg->size = sizeof(msg->payload.u64);
 921 }
 922
 923 static void
 924 vhost_user_set_protocol_features(struct virtio_net *dev,
 925                                  uint64_t protocol_features)
 926 {
 927         if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES)
 928                 return;
 929
 930         dev->protocol_features = protocol_features;
 931 }
 932
 933 static int
 934 vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg)
 935 {
 936         int fd = msg->fds[0];
 937         uint64_t size, off;
 938         void *addr;
 939
 940         if (fd < 0) {
 941                 RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
 942                 return -1;
 943         }
 944
 945         if (msg->size != sizeof(VhostUserLog)) {
 946                 RTE_LOG(ERR, VHOST_CONFIG,
 947                         "invalid log base msg size: %"PRId32" != %d\n",
 948                         msg->size, (int)sizeof(VhostUserLog));
 949                 return -1;
 950         }
 951
 952         size = msg->payload.log.mmap_size;
 953         off  = msg->payload.log.mmap_offset;
 954         RTE_LOG(INFO, VHOST_CONFIG,
 955                 "log mmap size: %"PRId64", offset: %"PRId64"\n",
 956                 size, off);
 957
 958         /*
 959          * mmap from 0 to workaround a hugepage mmap bug: mmap will
 960          * fail when offset is not page size aligned.
 961          */
 962         addr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 963         close(fd);
 964         if (addr == MAP_FAILED) {
 965                 RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
 966                 return -1;
 967         }
 968
 969         /*
 970          * Free previously mapped log memory on occasionally
 971          * multiple VHOST_USER_SET_LOG_BASE.
 972          */
 973         if (dev->log_addr) {
 974                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 975         }
 976         dev->log_addr = (uint64_t)(uintptr_t)addr;
 977         dev->log_base = dev->log_addr + off;
 978         dev->log_size = size;
 979
 980         return 0;
 981 }
 982
 983 /*
 984  * An rarp packet is constructed and broadcasted to notify switches about
 985  * the new location of the migrated VM, so that packets from outside will
 986  * not be lost after migration.
 987  *
 988  * However, we don't actually "send" a rarp packet here, instead, we set
 989  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
 990  */
 991 static int
 992 vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg)
 993 {
 994         uint8_t *mac = (uint8_t *)&msg->payload.u64;
 995
 996         RTE_LOG(DEBUG, VHOST_CONFIG,
 997                 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
 998                 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
 999         memcpy(dev->mac.addr_bytes, mac, 6);
1000
1001         /*
1002          * Set the flag to inject a RARP broadcast packet at
1003          * rte_vhost_dequeue_burst().
1004          *
1005          * rte_smp_wmb() is for making sure the mac is copied
1006          * before the flag is set.
1007          */
1008         rte_smp_wmb();
1009         rte_atomic16_set(&dev->broadcast_rarp, 1);
1010
1011         return 0;
1012 }
1013
1014 static int
1015 vhost_user_net_set_mtu(struct virtio_net *dev, struct VhostUserMsg *msg)
1016 {
1017         if (msg->payload.u64 < VIRTIO_MIN_MTU ||
1018                         msg->payload.u64 > VIRTIO_MAX_MTU) {
1019                 RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n",
1020                                 msg->payload.u64);
1021
1022                 return -1;
1023         }
1024
1025         dev->mtu = msg->payload.u64;
1026
1027         return 0;
1028 }
1029
1030 static int
1031 vhost_user_set_req_fd(struct virtio_net *dev, struct VhostUserMsg *msg)
1032 {
1033         int fd = msg->fds[0];
1034
1035         if (fd < 0) {
1036                 RTE_LOG(ERR, VHOST_CONFIG,
1037                                 "Invalid file descriptor for slave channel (%d)\n",
1038                                 fd);
1039                 return -1;
1040         }
1041
1042         dev->slave_req_fd = fd;
1043
1044         return 0;
1045 }
1046
1047 static int
1048 is_vring_iotlb_update(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
1049 {
1050         struct vhost_vring_addr *ra;
1051         uint64_t start, end;
1052
1053         start = imsg->iova;
1054         end = start + imsg->size;
1055
1056         ra = &vq->ring_addrs;
1057         if (ra->desc_user_addr >= start && ra->desc_user_addr < end)
1058                 return 1;
1059         if (ra->avail_user_addr >= start && ra->avail_user_addr < end)
1060                 return 1;
1061         if (ra->used_user_addr >= start && ra->used_user_addr < end)
1062                 return 1;
1063
1064         return 0;
1065 }
1066
1067 static int
1068 is_vring_iotlb_invalidate(struct vhost_virtqueue *vq,
1069                                 struct vhost_iotlb_msg *imsg)
1070 {
1071         uint64_t istart, iend, vstart, vend;
1072
1073         istart = imsg->iova;
1074         iend = istart + imsg->size - 1;
1075
1076         vstart = (uintptr_t)vq->desc;
1077         vend = vstart + sizeof(struct vring_desc) * vq->size - 1;
1078         if (vstart <= iend && istart <= vend)
1079                 return 1;
1080
1081         vstart = (uintptr_t)vq->avail;
1082         vend = vstart + sizeof(struct vring_avail);
1083         vend += sizeof(uint16_t) * vq->size - 1;
1084         if (vstart <= iend && istart <= vend)
1085                 return 1;
1086
1087         vstart = (uintptr_t)vq->used;
1088         vend = vstart + sizeof(struct vring_used);
1089         vend += sizeof(struct vring_used_elem) * vq->size - 1;
1090         if (vstart <= iend && istart <= vend)
1091                 return 1;
1092
1093         return 0;
1094 }
1095
1096 static int
1097 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg)
1098 {
1099         struct virtio_net *dev = *pdev;
1100         struct vhost_iotlb_msg *imsg = &msg->payload.iotlb;
1101         uint16_t i;
1102         uint64_t vva;
1103
1104         switch (imsg->type) {
1105         case VHOST_IOTLB_UPDATE:
1106                 vva = qva_to_vva(dev, imsg->uaddr);
1107                 if (!vva)
1108                         return -1;
1109
1110                 for (i = 0; i < dev->nr_vring; i++) {
1111                         struct vhost_virtqueue *vq = dev->virtqueue[i];
1112
1113                         vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
1114                                         imsg->size, imsg->perm);
1115
1116                         if (is_vring_iotlb_update(vq, imsg))
1117                                 *pdev = dev = translate_ring_addresses(dev, i);
1118                 }
1119                 break;
1120         case VHOST_IOTLB_INVALIDATE:
1121                 for (i = 0; i < dev->nr_vring; i++) {
1122                         struct vhost_virtqueue *vq = dev->virtqueue[i];
1123
1124                         vhost_user_iotlb_cache_remove(vq, imsg->iova,
1125                                         imsg->size);
1126
1127                         if (is_vring_iotlb_invalidate(vq, imsg))
1128                                 vring_invalidate(dev, vq);
1129                 }
1130                 break;
1131         default:
1132                 RTE_LOG(ERR, VHOST_CONFIG, "Invalid IOTLB message type (%d)\n",
1133                                 imsg->type);
1134                 return -1;
1135         }
1136
1137         return 0;
1138 }
1139
1140 /* return bytes# of read on success or negative val on failure. */
1141 static int
1142 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
1143 {
1144         int ret;
1145
1146         ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
1147                 msg->fds, VHOST_MEMORY_MAX_NREGIONS);
1148         if (ret <= 0)
1149                 return ret;
1150
1151         if (msg && msg->size) {
1152                 if (msg->size > sizeof(msg->payload)) {
1153                         RTE_LOG(ERR, VHOST_CONFIG,
1154                                 "invalid msg size: %d\n", msg->size);
1155                         return -1;
1156                 }
1157                 ret = read(sockfd, &msg->payload, msg->size);
1158                 if (ret <= 0)
1159                         return ret;
1160                 if (ret != (int)msg->size) {
1161                         RTE_LOG(ERR, VHOST_CONFIG,
1162                                 "read control message failed\n");
1163                         return -1;
1164                 }
1165         }
1166
1167         return ret;
1168 }
1169
1170 static int
1171 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
1172 {
1173         if (!msg)
1174                 return 0;
1175
1176         return send_fd_message(sockfd, (char *)msg,
1177                 VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
1178 }
1179
1180 static int
1181 send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
1182 {
1183         if (!msg)
1184                 return 0;
1185
1186         msg->flags &= ~VHOST_USER_VERSION_MASK;
1187         msg->flags &= ~VHOST_USER_NEED_REPLY;
1188         msg->flags |= VHOST_USER_VERSION;
1189         msg->flags |= VHOST_USER_REPLY_MASK;
1190
1191         return send_vhost_message(sockfd, msg);
1192 }
1193
1194 /*
1195  * Allocate a queue pair if it hasn't been allocated yet
1196  */
1197 static int
1198 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, VhostUserMsg *msg)
1199 {
1200         uint16_t vring_idx;
1201
1202         switch (msg->request.master) {
1203         case VHOST_USER_SET_VRING_KICK:
1204         case VHOST_USER_SET_VRING_CALL:
1205         case VHOST_USER_SET_VRING_ERR:
1206                 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1207                 break;
1208         case VHOST_USER_SET_VRING_NUM:
1209         case VHOST_USER_SET_VRING_BASE:
1210         case VHOST_USER_SET_VRING_ENABLE:
1211                 vring_idx = msg->payload.state.index;
1212                 break;
1213         case VHOST_USER_SET_VRING_ADDR:
1214                 vring_idx = msg->payload.addr.index;
1215                 break;
1216         default:
1217                 return 0;
1218         }
1219
1220         if (vring_idx >= VHOST_MAX_VRING) {
1221                 RTE_LOG(ERR, VHOST_CONFIG,
1222                         "invalid vring index: %u\n", vring_idx);
1223                 return -1;
1224         }
1225
1226         if (dev->virtqueue[vring_idx])
1227                 return 0;
1228
1229         return alloc_vring_queue(dev, vring_idx);
1230 }
1231
1232 int
1233 vhost_user_msg_handler(int vid, int fd)
1234 {
1235         struct virtio_net *dev;
1236         struct VhostUserMsg msg;
1237         int ret;
1238
1239         dev = get_device(vid);
1240         if (dev == NULL)
1241                 return -1;
1242
1243         if (!dev->notify_ops) {
1244                 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
1245                 if (!dev->notify_ops) {
1246                         RTE_LOG(ERR, VHOST_CONFIG,
1247                                 "failed to get callback ops for driver %s\n",
1248                                 dev->ifname);
1249                         return -1;
1250                 }
1251         }
1252
1253         ret = read_vhost_message(fd, &msg);
1254         if (ret <= 0 || msg.request.master >= VHOST_USER_MAX) {
1255                 if (ret < 0)
1256                         RTE_LOG(ERR, VHOST_CONFIG,
1257                                 "vhost read message failed\n");
1258                 else if (ret == 0)
1259                         RTE_LOG(INFO, VHOST_CONFIG,
1260                                 "vhost peer closed\n");
1261                 else
1262                         RTE_LOG(ERR, VHOST_CONFIG,
1263                                 "vhost read incorrect message\n");
1264
1265                 return -1;
1266         }
1267
1268         ret = 0;
1269         if (msg.request.master != VHOST_USER_IOTLB_MSG)
1270                 RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
1271                         vhost_message_str[msg.request.master]);
1272         else
1273                 RTE_LOG(DEBUG, VHOST_CONFIG, "read message %s\n",
1274                         vhost_message_str[msg.request.master]);
1275
1276         ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
1277         if (ret < 0) {
1278                 RTE_LOG(ERR, VHOST_CONFIG,
1279                         "failed to alloc queue\n");
1280                 return -1;
1281         }
1282
1283         switch (msg.request.master) {
1284         case VHOST_USER_GET_FEATURES:
1285                 msg.payload.u64 = vhost_user_get_features(dev);
1286                 msg.size = sizeof(msg.payload.u64);
1287                 send_vhost_reply(fd, &msg);
1288                 break;
1289         case VHOST_USER_SET_FEATURES:
1290                 ret = vhost_user_set_features(dev, msg.payload.u64);
1291                 if (ret)
1292                         return -1;
1293                 break;
1294
1295         case VHOST_USER_GET_PROTOCOL_FEATURES:
1296                 vhost_user_get_protocol_features(dev, &msg);
1297                 send_vhost_reply(fd, &msg);
1298                 break;
1299         case VHOST_USER_SET_PROTOCOL_FEATURES:
1300                 vhost_user_set_protocol_features(dev, msg.payload.u64);
1301                 break;
1302
1303         case VHOST_USER_SET_OWNER:
1304                 vhost_user_set_owner();
1305                 break;
1306         case VHOST_USER_RESET_OWNER:
1307                 vhost_user_reset_owner(dev);
1308                 break;
1309
1310         case VHOST_USER_SET_MEM_TABLE:
1311                 ret = vhost_user_set_mem_table(dev, &msg);
1312                 break;
1313
1314         case VHOST_USER_SET_LOG_BASE:
1315                 vhost_user_set_log_base(dev, &msg);
1316
1317                 /* it needs a reply */
1318                 msg.size = sizeof(msg.payload.u64);
1319                 send_vhost_reply(fd, &msg);
1320                 break;
1321         case VHOST_USER_SET_LOG_FD:
1322                 close(msg.fds[0]);
1323                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
1324                 break;
1325
1326         case VHOST_USER_SET_VRING_NUM:
1327                 vhost_user_set_vring_num(dev, &msg);
1328                 break;
1329         case VHOST_USER_SET_VRING_ADDR:
1330                 vhost_user_set_vring_addr(&dev, &msg);
1331                 break;
1332         case VHOST_USER_SET_VRING_BASE:
1333                 vhost_user_set_vring_base(dev, &msg);
1334                 break;
1335
1336         case VHOST_USER_GET_VRING_BASE:
1337                 vhost_user_get_vring_base(dev, &msg);
1338                 msg.size = sizeof(msg.payload.state);
1339                 send_vhost_reply(fd, &msg);
1340                 break;
1341
1342         case VHOST_USER_SET_VRING_KICK:
1343                 vhost_user_set_vring_kick(&dev, &msg);
1344                 break;
1345         case VHOST_USER_SET_VRING_CALL:
1346                 vhost_user_set_vring_call(dev, &msg);
1347                 break;
1348
1349         case VHOST_USER_SET_VRING_ERR:
1350                 if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1351                         close(msg.fds[0]);
1352                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
1353                 break;
1354
1355         case VHOST_USER_GET_QUEUE_NUM:
1356                 msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
1357                 msg.size = sizeof(msg.payload.u64);
1358                 send_vhost_reply(fd, &msg);
1359                 break;
1360
1361         case VHOST_USER_SET_VRING_ENABLE:
1362                 vhost_user_set_vring_enable(dev, &msg);
1363                 break;
1364         case VHOST_USER_SEND_RARP:
1365                 vhost_user_send_rarp(dev, &msg);
1366                 break;
1367
1368         case VHOST_USER_NET_SET_MTU:
1369                 ret = vhost_user_net_set_mtu(dev, &msg);
1370                 break;
1371
1372         case VHOST_USER_SET_SLAVE_REQ_FD:
1373                 ret = vhost_user_set_req_fd(dev, &msg);
1374                 break;
1375
1376         case VHOST_USER_IOTLB_MSG:
1377                 ret = vhost_user_iotlb_msg(&dev, &msg);
1378                 break;
1379
1380         default:
1381                 ret = -1;
1382                 break;
1383
1384         }
1385
1386         if (msg.flags & VHOST_USER_NEED_REPLY) {
1387                 msg.payload.u64 = !!ret;
1388                 msg.size = sizeof(msg.payload.u64);
1389                 send_vhost_reply(fd, &msg);
1390         }
1391
1392         if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) {
1393                 dev->flags |= VIRTIO_DEV_READY;
1394
1395                 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
1396                         if (dev->dequeue_zero_copy) {
1397                                 RTE_LOG(INFO, VHOST_CONFIG,
1398                                                 "dequeue zero copy is enabled\n");
1399                         }
1400
1401                         if (dev->notify_ops->new_device(dev->vid) == 0)
1402                                 dev->flags |= VIRTIO_DEV_RUNNING;
1403                 }
1404         }
1405
1406         return 0;
1407 }
1408
1409 int
1410 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
1411 {
1412         int ret;
1413         struct VhostUserMsg msg = {
1414                 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
1415                 .flags = VHOST_USER_VERSION,
1416                 .size = sizeof(msg.payload.iotlb),
1417                 .payload.iotlb = {
1418                         .iova = iova,
1419                         .perm = perm,
1420                         .type = VHOST_IOTLB_MISS,
1421                 },
1422         };
1423
1424         ret = send_vhost_message(dev->slave_req_fd, &msg);
1425         if (ret < 0) {
1426                 RTE_LOG(ERR, VHOST_CONFIG,
1427                                 "Failed to send IOTLB miss message (%d)\n",
1428                                 ret);
1429                 return ret;
1430         }
1431
1432         return 0;
1433 }