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->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
 191             !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
 192                 /*
 193                  * Remove all but first queue pair if MQ hasn't been
 194                  * negotiated. This is safe because the device is not
 195                  * running at this stage.
 196                  */
 197                 while (dev->nr_vring > 2) {
 198                         struct vhost_virtqueue *vq;
 199
 200                         vq = dev->virtqueue[--dev->nr_vring];
 201                         if (!vq)
 202                                 continue;
 203
 204                         dev->virtqueue[dev->nr_vring] = NULL;
 205                         cleanup_vq(vq, 1);
 206                         free_vq(vq);
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 /*
 214  * The virtio device sends us the size of the descriptor ring.
 215  */
 216 static int
 217 vhost_user_set_vring_num(struct virtio_net *dev,
 218                          VhostUserMsg *msg)
 219 {
 220         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 221
 222         vq->size = msg->payload.state.num;
 223
 224         if (dev->dequeue_zero_copy) {
 225                 vq->nr_zmbuf = 0;
 226                 vq->last_zmbuf_idx = 0;
 227                 vq->zmbuf_size = vq->size;
 228                 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
 229                                          sizeof(struct zcopy_mbuf), 0);
 230                 if (vq->zmbufs == NULL) {
 231                         RTE_LOG(WARNING, VHOST_CONFIG,
 232                                 "failed to allocate mem for zero copy; "
 233                                 "zero copy is force disabled\n");
 234                         dev->dequeue_zero_copy = 0;
 235                 }
 236                 TAILQ_INIT(&vq->zmbuf_list);
 237         }
 238
 239         vq->shadow_used_ring = rte_malloc(NULL,
 240                                 vq->size * sizeof(struct vring_used_elem),
 241                                 RTE_CACHE_LINE_SIZE);
 242         if (!vq->shadow_used_ring) {
 243                 RTE_LOG(ERR, VHOST_CONFIG,
 244                         "failed to allocate memory for shadow used ring.\n");
 245                 return -1;
 246         }
 247
 248         vq->batch_copy_elems = rte_malloc(NULL,
 249                                 vq->size * sizeof(struct batch_copy_elem),
 250                                 RTE_CACHE_LINE_SIZE);
 251         if (!vq->batch_copy_elems) {
 252                 RTE_LOG(ERR, VHOST_CONFIG,
 253                         "failed to allocate memory for batching copy.\n");
 254                 return -1;
 255         }
 256
 257         return 0;
 258 }
 259
 260 /*
 261  * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
 262  * same numa node as the memory of vring descriptor.
 263  */
 264 #ifdef RTE_LIBRTE_VHOST_NUMA
 265 static struct virtio_net*
 266 numa_realloc(struct virtio_net *dev, int index)
 267 {
 268         int oldnode, newnode;
 269         struct virtio_net *old_dev;
 270         struct vhost_virtqueue *old_vq, *vq;
 271         struct zcopy_mbuf *new_zmbuf;
 272         struct vring_used_elem *new_shadow_used_ring;
 273         struct batch_copy_elem *new_batch_copy_elems;
 274         int ret;
 275
 276         old_dev = dev;
 277         vq = old_vq = dev->virtqueue[index];
 278
 279         ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
 280                             MPOL_F_NODE | MPOL_F_ADDR);
 281
 282         /* check if we need to reallocate vq */
 283         ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
 284                              MPOL_F_NODE | MPOL_F_ADDR);
 285         if (ret) {
 286                 RTE_LOG(ERR, VHOST_CONFIG,
 287                         "Unable to get vq numa information.\n");
 288                 return dev;
 289         }
 290         if (oldnode != newnode) {
 291                 RTE_LOG(INFO, VHOST_CONFIG,
 292                         "reallocate vq from %d to %d node\n", oldnode, newnode);
 293                 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
 294                 if (!vq)
 295                         return dev;
 296
 297                 memcpy(vq, old_vq, sizeof(*vq));
 298                 TAILQ_INIT(&vq->zmbuf_list);
 299
 300                 new_zmbuf = rte_malloc_socket(NULL, vq->zmbuf_size *
 301                         sizeof(struct zcopy_mbuf), 0, newnode);
 302                 if (new_zmbuf) {
 303                         rte_free(vq->zmbufs);
 304                         vq->zmbufs = new_zmbuf;
 305                 }
 306
 307                 new_shadow_used_ring = rte_malloc_socket(NULL,
 308                         vq->size * sizeof(struct vring_used_elem),
 309                         RTE_CACHE_LINE_SIZE,
 310                         newnode);
 311                 if (new_shadow_used_ring) {
 312                         rte_free(vq->shadow_used_ring);
 313                         vq->shadow_used_ring = new_shadow_used_ring;
 314                 }
 315
 316                 new_batch_copy_elems = rte_malloc_socket(NULL,
 317                         vq->size * sizeof(struct batch_copy_elem),
 318                         RTE_CACHE_LINE_SIZE,
 319                         newnode);
 320                 if (new_batch_copy_elems) {
 321                         rte_free(vq->batch_copy_elems);
 322                         vq->batch_copy_elems = new_batch_copy_elems;
 323                 }
 324
 325                 rte_free(old_vq);
 326         }
 327
 328         /* check if we need to reallocate dev */
 329         ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
 330                             MPOL_F_NODE | MPOL_F_ADDR);
 331         if (ret) {
 332                 RTE_LOG(ERR, VHOST_CONFIG,
 333                         "Unable to get dev numa information.\n");
 334                 goto out;
 335         }
 336         if (oldnode != newnode) {
 337                 RTE_LOG(INFO, VHOST_CONFIG,
 338                         "reallocate dev from %d to %d node\n",
 339                         oldnode, newnode);
 340                 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
 341                 if (!dev) {
 342                         dev = old_dev;
 343                         goto out;
 344                 }
 345
 346                 memcpy(dev, old_dev, sizeof(*dev));
 347                 rte_free(old_dev);
 348         }
 349
 350 out:
 351         dev->virtqueue[index] = vq;
 352         vhost_devices[dev->vid] = dev;
 353
 354         if (old_vq != vq)
 355                 vhost_user_iotlb_init(dev, index);
 356
 357         return dev;
 358 }
 359 #else
 360 static struct virtio_net*
 361 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 362 {
 363         return dev;
 364 }
 365 #endif
 366
 367 /* Converts QEMU virtual address to Vhost virtual address. */
 368 static uint64_t
 369 qva_to_vva(struct virtio_net *dev, uint64_t qva)
 370 {
 371         struct rte_vhost_mem_region *reg;
 372         uint32_t i;
 373
 374         /* Find the region where the address lives. */
 375         for (i = 0; i < dev->mem->nregions; i++) {
 376                 reg = &dev->mem->regions[i];
 377
 378                 if (qva >= reg->guest_user_addr &&
 379                     qva <  reg->guest_user_addr + reg->size) {
 380                         return qva - reg->guest_user_addr +
 381                                reg->host_user_addr;
 382                 }
 383         }
 384
 385         return 0;
 386 }
 387
 388
 389 /*
 390  * Converts ring address to Vhost virtual address.
 391  * If IOMMU is enabled, the ring address is a guest IO virtual address,
 392  * else it is a QEMU virtual address.
 393  */
 394 static uint64_t
 395 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 396                 uint64_t ra, uint64_t size)
 397 {
 398         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 399                 uint64_t vva;
 400
 401                 vva = vhost_user_iotlb_cache_find(vq, ra,
 402                                         &size, VHOST_ACCESS_RW);
 403                 if (!vva)
 404                         vhost_user_iotlb_miss(dev, ra, VHOST_ACCESS_RW);
 405
 406                 return vva;
 407         }
 408
 409         return qva_to_vva(dev, ra);
 410 }
 411
 412 static struct virtio_net *
 413 translate_ring_addresses(struct virtio_net *dev, int vq_index)
 414 {
 415         struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 416         struct vhost_vring_addr *addr = &vq->ring_addrs;
 417
 418         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 419         if (vq->desc && vq->avail && vq->used)
 420                 return dev;
 421
 422         vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
 423                         vq, addr->desc_user_addr, sizeof(struct vring_desc));
 424         if (vq->desc == 0) {
 425                 RTE_LOG(DEBUG, VHOST_CONFIG,
 426                         "(%d) failed to find desc ring address.\n",
 427                         dev->vid);
 428                 return dev;
 429         }
 430
 431         dev = numa_realloc(dev, vq_index);
 432         vq = dev->virtqueue[vq_index];
 433         addr = &vq->ring_addrs;
 434
 435         vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
 436                         vq, addr->avail_user_addr, sizeof(struct vring_avail));
 437         if (vq->avail == 0) {
 438                 RTE_LOG(DEBUG, VHOST_CONFIG,
 439                         "(%d) failed to find avail ring address.\n",
 440                         dev->vid);
 441                 return dev;
 442         }
 443
 444         vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
 445                         vq, addr->used_user_addr, sizeof(struct vring_used));
 446         if (vq->used == 0) {
 447                 RTE_LOG(DEBUG, VHOST_CONFIG,
 448                         "(%d) failed to find used ring address.\n",
 449                         dev->vid);
 450                 return dev;
 451         }
 452
 453         if (vq->last_used_idx != vq->used->idx) {
 454                 RTE_LOG(WARNING, VHOST_CONFIG,
 455                         "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
 456                         "some packets maybe resent for Tx and dropped for Rx\n",
 457                         vq->last_used_idx, vq->used->idx);
 458                 vq->last_used_idx  = vq->used->idx;
 459                 vq->last_avail_idx = vq->used->idx;
 460         }
 461
 462         vq->log_guest_addr = addr->log_guest_addr;
 463
 464         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
 465                         dev->vid, vq->desc);
 466         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n",
 467                         dev->vid, vq->avail);
 468         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n",
 469                         dev->vid, vq->used);
 470         LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
 471                         dev->vid, vq->log_guest_addr);
 472
 473         return dev;
 474 }
 475
 476 /*
 477  * The virtio device sends us the desc, used and avail ring addresses.
 478  * This function then converts these to our address space.
 479  */
 480 static int
 481 vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
 482 {
 483         struct vhost_virtqueue *vq;
 484         struct vhost_vring_addr *addr = &msg->payload.addr;
 485         struct virtio_net *dev = *pdev;
 486
 487         if (dev->mem == NULL)
 488                 return -1;
 489
 490         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 491         vq = dev->virtqueue[msg->payload.addr.index];
 492
 493         /*
 494          * Rings addresses should not be interpreted as long as the ring is not
 495          * started and enabled
 496          */
 497         memcpy(&vq->ring_addrs, addr, sizeof(*addr));
 498
 499         vring_invalidate(dev, vq);
 500
 501         if (vq->enabled && (dev->features &
 502                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
 503                 dev = translate_ring_addresses(dev, msg->payload.state.index);
 504                 if (!dev)
 505                         return -1;
 506
 507                 *pdev = dev;
 508         }
 509
 510         return 0;
 511 }
 512
 513 /*
 514  * The virtio device sends us the available ring last used index.
 515  */
 516 static int
 517 vhost_user_set_vring_base(struct virtio_net *dev,
 518                           VhostUserMsg *msg)
 519 {
 520         dev->virtqueue[msg->payload.state.index]->last_used_idx  =
 521                         msg->payload.state.num;
 522         dev->virtqueue[msg->payload.state.index]->last_avail_idx =
 523                         msg->payload.state.num;
 524
 525         return 0;
 526 }
 527
 528 static void
 529 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 530                    uint64_t host_phys_addr, uint64_t size)
 531 {
 532         struct guest_page *page, *last_page;
 533
 534         if (dev->nr_guest_pages == dev->max_guest_pages) {
 535                 dev->max_guest_pages *= 2;
 536                 dev->guest_pages = realloc(dev->guest_pages,
 537                                         dev->max_guest_pages * sizeof(*page));
 538         }
 539
 540         if (dev->nr_guest_pages > 0) {
 541                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
 542                 /* merge if the two pages are continuous */
 543                 if (host_phys_addr == last_page->host_phys_addr +
 544                                       last_page->size) {
 545                         last_page->size += size;
 546                         return;
 547                 }
 548         }
 549
 550         page = &dev->guest_pages[dev->nr_guest_pages++];
 551         page->guest_phys_addr = guest_phys_addr;
 552         page->host_phys_addr  = host_phys_addr;
 553         page->size = size;
 554 }
 555
 556 static void
 557 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
 558                 uint64_t page_size)
 559 {
 560         uint64_t reg_size = reg->size;
 561         uint64_t host_user_addr  = reg->host_user_addr;
 562         uint64_t guest_phys_addr = reg->guest_phys_addr;
 563         uint64_t host_phys_addr;
 564         uint64_t size;
 565
 566         host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
 567         size = page_size - (guest_phys_addr & (page_size - 1));
 568         size = RTE_MIN(size, reg_size);
 569
 570         add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
 571         host_user_addr  += size;
 572         guest_phys_addr += size;
 573         reg_size -= size;
 574
 575         while (reg_size > 0) {
 576                 size = RTE_MIN(reg_size, page_size);
 577                 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
 578                                                   host_user_addr);
 579                 add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
 580
 581                 host_user_addr  += size;
 582                 guest_phys_addr += size;
 583                 reg_size -= size;
 584         }
 585 }
 586
 587 #ifdef RTE_LIBRTE_VHOST_DEBUG
 588 /* TODO: enable it only in debug mode? */
 589 static void
 590 dump_guest_pages(struct virtio_net *dev)
 591 {
 592         uint32_t i;
 593         struct guest_page *page;
 594
 595         for (i = 0; i < dev->nr_guest_pages; i++) {
 596                 page = &dev->guest_pages[i];
 597
 598                 RTE_LOG(INFO, VHOST_CONFIG,
 599                         "guest physical page region %u\n"
 600                         "\t guest_phys_addr: %" PRIx64 "\n"
 601                         "\t host_phys_addr : %" PRIx64 "\n"
 602                         "\t size           : %" PRIx64 "\n",
 603                         i,
 604                         page->guest_phys_addr,
 605                         page->host_phys_addr,
 606                         page->size);
 607         }
 608 }
 609 #else
 610 #define dump_guest_pages(dev)
 611 #endif
 612
 613 static bool
 614 vhost_memory_changed(struct VhostUserMemory *new,
 615                      struct rte_vhost_memory *old)
 616 {
 617         uint32_t i;
 618
 619         if (new->nregions != old->nregions)
 620                 return true;
 621
 622         for (i = 0; i < new->nregions; ++i) {
 623                 VhostUserMemoryRegion *new_r = &new->regions[i];
 624                 struct rte_vhost_mem_region *old_r = &old->regions[i];
 625
 626                 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
 627                         return true;
 628                 if (new_r->memory_size != old_r->size)
 629                         return true;
 630                 if (new_r->userspace_addr != old_r->guest_user_addr)
 631                         return true;
 632         }
 633
 634         return false;
 635 }
 636
 637 static int
 638 vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 639 {
 640         struct VhostUserMemory memory = pmsg->payload.memory;
 641         struct rte_vhost_mem_region *reg;
 642         void *mmap_addr;
 643         uint64_t mmap_size;
 644         uint64_t mmap_offset;
 645         uint64_t alignment;
 646         uint32_t i;
 647         int fd;
 648
 649         if (dev->mem && !vhost_memory_changed(&memory, dev->mem)) {
 650                 RTE_LOG(INFO, VHOST_CONFIG,
 651                         "(%d) memory regions not changed\n", dev->vid);
 652
 653                 for (i = 0; i < memory.nregions; i++)
 654                         close(pmsg->fds[i]);
 655
 656                 return 0;
 657         }
 658
 659         if (dev->mem) {
 660                 free_mem_region(dev);
 661                 rte_free(dev->mem);
 662                 dev->mem = NULL;
 663         }
 664
 665         dev->nr_guest_pages = 0;
 666         if (!dev->guest_pages) {
 667                 dev->max_guest_pages = 8;
 668                 dev->guest_pages = malloc(dev->max_guest_pages *
 669                                                 sizeof(struct guest_page));
 670                 if (dev->guest_pages == NULL) {
 671                         RTE_LOG(ERR, VHOST_CONFIG,
 672                                 "(%d) failed to allocate memory "
 673                                 "for dev->guest_pages\n",
 674                                 dev->vid);
 675                         return -1;
 676                 }
 677         }
 678
 679         dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
 680                 sizeof(struct rte_vhost_mem_region) * memory.nregions, 0);
 681         if (dev->mem == NULL) {
 682                 RTE_LOG(ERR, VHOST_CONFIG,
 683                         "(%d) failed to allocate memory for dev->mem\n",
 684                         dev->vid);
 685                 return -1;
 686         }
 687         dev->mem->nregions = memory.nregions;
 688
 689         for (i = 0; i < memory.nregions; i++) {
 690                 fd  = pmsg->fds[i];
 691                 reg = &dev->mem->regions[i];
 692
 693                 reg->guest_phys_addr = memory.regions[i].guest_phys_addr;
 694                 reg->guest_user_addr = memory.regions[i].userspace_addr;
 695                 reg->size            = memory.regions[i].memory_size;
 696                 reg->fd              = fd;
 697
 698                 mmap_offset = memory.regions[i].mmap_offset;
 699                 mmap_size   = reg->size + mmap_offset;
 700
 701                 /* mmap() without flag of MAP_ANONYMOUS, should be called
 702                  * with length argument aligned with hugepagesz at older
 703                  * longterm version Linux, like 2.6.32 and 3.2.72, or
 704                  * mmap() will fail with EINVAL.
 705                  *
 706                  * to avoid failure, make sure in caller to keep length
 707                  * aligned.
 708                  */
 709                 alignment = get_blk_size(fd);
 710                 if (alignment == (uint64_t)-1) {
 711                         RTE_LOG(ERR, VHOST_CONFIG,
 712                                 "couldn't get hugepage size through fstat\n");
 713                         goto err_mmap;
 714                 }
 715                 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
 716
 717                 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
 718                                  MAP_SHARED | MAP_POPULATE, fd, 0);
 719
 720                 if (mmap_addr == MAP_FAILED) {
 721                         RTE_LOG(ERR, VHOST_CONFIG,
 722                                 "mmap region %u failed.\n", i);
 723                         goto err_mmap;
 724                 }
 725
 726                 reg->mmap_addr = mmap_addr;
 727                 reg->mmap_size = mmap_size;
 728                 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
 729                                       mmap_offset;
 730
 731                 if (dev->dequeue_zero_copy)
 732                         add_guest_pages(dev, reg, alignment);
 733
 734                 RTE_LOG(INFO, VHOST_CONFIG,
 735                         "guest memory region %u, size: 0x%" PRIx64 "\n"
 736                         "\t guest physical addr: 0x%" PRIx64 "\n"
 737                         "\t guest virtual  addr: 0x%" PRIx64 "\n"
 738                         "\t host  virtual  addr: 0x%" PRIx64 "\n"
 739                         "\t mmap addr : 0x%" PRIx64 "\n"
 740                         "\t mmap size : 0x%" PRIx64 "\n"
 741                         "\t mmap align: 0x%" PRIx64 "\n"
 742                         "\t mmap off  : 0x%" PRIx64 "\n",
 743                         i, reg->size,
 744                         reg->guest_phys_addr,
 745                         reg->guest_user_addr,
 746                         reg->host_user_addr,
 747                         (uint64_t)(uintptr_t)mmap_addr,
 748                         mmap_size,
 749                         alignment,
 750                         mmap_offset);
 751         }
 752
 753         dump_guest_pages(dev);
 754
 755         return 0;
 756
 757 err_mmap:
 758         free_mem_region(dev);
 759         rte_free(dev->mem);
 760         dev->mem = NULL;
 761         return -1;
 762 }
 763
 764 static int
 765 vq_is_ready(struct vhost_virtqueue *vq)
 766 {
 767         return vq && vq->desc && vq->avail && vq->used &&
 768                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
 769                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
 770 }
 771
 772 static int
 773 virtio_is_ready(struct virtio_net *dev)
 774 {
 775         struct vhost_virtqueue *vq;
 776         uint32_t i;
 777
 778         if (dev->nr_vring == 0)
 779                 return 0;
 780
 781         for (i = 0; i < dev->nr_vring; i++) {
 782                 vq = dev->virtqueue[i];
 783
 784                 if (!vq_is_ready(vq))
 785                         return 0;
 786         }
 787
 788         RTE_LOG(INFO, VHOST_CONFIG,
 789                 "virtio is now ready for processing.\n");
 790         return 1;
 791 }
 792
 793 static void
 794 vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 795 {
 796         struct vhost_vring_file file;
 797         struct vhost_virtqueue *vq;
 798
 799         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
 800         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
 801                 file.fd = VIRTIO_INVALID_EVENTFD;
 802         else
 803                 file.fd = pmsg->fds[0];
 804         RTE_LOG(INFO, VHOST_CONFIG,
 805                 "vring call idx:%d file:%d\n", file.index, file.fd);
 806
 807         vq = dev->virtqueue[file.index];
 808         if (vq->callfd >= 0)
 809                 close(vq->callfd);
 810
 811         vq->callfd = file.fd;
 812 }
 813
 814 static void
 815 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *pmsg)
 816 {
 817         struct vhost_vring_file file;
 818         struct vhost_virtqueue *vq;
 819         struct virtio_net *dev = *pdev;
 820
 821         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
 822         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
 823                 file.fd = VIRTIO_INVALID_EVENTFD;
 824         else
 825                 file.fd = pmsg->fds[0];
 826         RTE_LOG(INFO, VHOST_CONFIG,
 827                 "vring kick idx:%d file:%d\n", file.index, file.fd);
 828
 829         /* Interpret ring addresses only when ring is started. */
 830         dev = translate_ring_addresses(dev, file.index);
 831         if (!dev)
 832                 return;
 833
 834         *pdev = dev;
 835
 836         vq = dev->virtqueue[file.index];
 837
 838         /*
 839          * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
 840          * the ring starts already enabled. Otherwise, it is enabled via
 841          * the SET_VRING_ENABLE message.
 842          */
 843         if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)))
 844                 vq->enabled = 1;
 845
 846         if (vq->kickfd >= 0)
 847                 close(vq->kickfd);
 848         vq->kickfd = file.fd;
 849 }
 850
 851 static void
 852 free_zmbufs(struct vhost_virtqueue *vq)
 853 {
 854         struct zcopy_mbuf *zmbuf, *next;
 855
 856         for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
 857              zmbuf != NULL; zmbuf = next) {
 858                 next = TAILQ_NEXT(zmbuf, next);
 859
 860                 rte_pktmbuf_free(zmbuf->mbuf);
 861                 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
 862         }
 863
 864         rte_free(vq->zmbufs);
 865 }
 866
 867 /*
 868  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
 869  */
 870 static int
 871 vhost_user_get_vring_base(struct virtio_net *dev,
 872                           VhostUserMsg *msg)
 873 {
 874         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 875
 876         /* We have to stop the queue (virtio) if it is running. */
 877         if (dev->flags & VIRTIO_DEV_RUNNING) {
 878                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 879                 dev->notify_ops->destroy_device(dev->vid);
 880         }
 881
 882         dev->flags &= ~VIRTIO_DEV_READY;
 883
 884         /* Here we are safe to get the last used index */
 885         msg->payload.state.num = vq->last_used_idx;
 886
 887         RTE_LOG(INFO, VHOST_CONFIG,
 888                 "vring base idx:%d file:%d\n", msg->payload.state.index,
 889                 msg->payload.state.num);
 890         /*
 891          * Based on current qemu vhost-user implementation, this message is
 892          * sent and only sent in vhost_vring_stop.
 893          * TODO: cleanup the vring, it isn't usable since here.
 894          */
 895         if (vq->kickfd >= 0)
 896                 close(vq->kickfd);
 897
 898         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 899
 900         if (dev->dequeue_zero_copy)
 901                 free_zmbufs(vq);
 902         rte_free(vq->shadow_used_ring);
 903         vq->shadow_used_ring = NULL;
 904
 905         rte_free(vq->batch_copy_elems);
 906         vq->batch_copy_elems = NULL;
 907
 908         return 0;
 909 }
 910
 911 /*
 912  * when virtio queues are ready to work, qemu will send us to
 913  * enable the virtio queue pair.
 914  */
 915 static int
 916 vhost_user_set_vring_enable(struct virtio_net *dev,
 917                             VhostUserMsg *msg)
 918 {
 919         int enable = (int)msg->payload.state.num;
 920
 921         RTE_LOG(INFO, VHOST_CONFIG,
 922                 "set queue enable: %d to qp idx: %d\n",
 923                 enable, msg->payload.state.index);
 924
 925         if (dev->notify_ops->vring_state_changed)
 926                 dev->notify_ops->vring_state_changed(dev->vid,
 927                                 msg->payload.state.index, enable);
 928
 929         dev->virtqueue[msg->payload.state.index]->enabled = enable;
 930
 931         return 0;
 932 }
 933
 934 static void
 935 vhost_user_get_protocol_features(struct virtio_net *dev,
 936                                  struct VhostUserMsg *msg)
 937 {
 938         uint64_t features, protocol_features = VHOST_USER_PROTOCOL_FEATURES;
 939
 940         rte_vhost_driver_get_features(dev->ifname, &features);
 941
 942         /*
 943          * REPLY_ACK protocol feature is only mandatory for now
 944          * for IOMMU feature. If IOMMU is explicitly disabled by the
 945          * application, disable also REPLY_ACK feature for older buggy
 946          * Qemu versions (from v2.7.0 to v2.9.0).
 947          */
 948         if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
 949                 protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK);
 950
 951         msg->payload.u64 = protocol_features;
 952         msg->size = sizeof(msg->payload.u64);
 953 }
 954
 955 static void
 956 vhost_user_set_protocol_features(struct virtio_net *dev,
 957                                  uint64_t protocol_features)
 958 {
 959         if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES)
 960                 return;
 961
 962         dev->protocol_features = protocol_features;
 963 }
 964
 965 static int
 966 vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg)
 967 {
 968         int fd = msg->fds[0];
 969         uint64_t size, off;
 970         void *addr;
 971
 972         if (fd < 0) {
 973                 RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
 974                 return -1;
 975         }
 976
 977         if (msg->size != sizeof(VhostUserLog)) {
 978                 RTE_LOG(ERR, VHOST_CONFIG,
 979                         "invalid log base msg size: %"PRId32" != %d\n",
 980                         msg->size, (int)sizeof(VhostUserLog));
 981                 return -1;
 982         }
 983
 984         size = msg->payload.log.mmap_size;
 985         off  = msg->payload.log.mmap_offset;
 986         RTE_LOG(INFO, VHOST_CONFIG,
 987                 "log mmap size: %"PRId64", offset: %"PRId64"\n",
 988                 size, off);
 989
 990         /*
 991          * mmap from 0 to workaround a hugepage mmap bug: mmap will
 992          * fail when offset is not page size aligned.
 993          */
 994         addr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 995         close(fd);
 996         if (addr == MAP_FAILED) {
 997                 RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
 998                 return -1;
 999         }
1000
1001         /*
1002          * Free previously mapped log memory on occasionally
1003          * multiple VHOST_USER_SET_LOG_BASE.
1004          */
1005         if (dev->log_addr) {
1006                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
1007         }
1008         dev->log_addr = (uint64_t)(uintptr_t)addr;
1009         dev->log_base = dev->log_addr + off;
1010         dev->log_size = size;
1011
1012         return 0;
1013 }
1014
1015 /*
1016  * An rarp packet is constructed and broadcasted to notify switches about
1017  * the new location of the migrated VM, so that packets from outside will
1018  * not be lost after migration.
1019  *
1020  * However, we don't actually "send" a rarp packet here, instead, we set
1021  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
1022  */
1023 static int
1024 vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg)
1025 {
1026         uint8_t *mac = (uint8_t *)&msg->payload.u64;
1027
1028         RTE_LOG(DEBUG, VHOST_CONFIG,
1029                 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
1030                 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
1031         memcpy(dev->mac.addr_bytes, mac, 6);
1032
1033         /*
1034          * Set the flag to inject a RARP broadcast packet at
1035          * rte_vhost_dequeue_burst().
1036          *
1037          * rte_smp_wmb() is for making sure the mac is copied
1038          * before the flag is set.
1039          */
1040         rte_smp_wmb();
1041         rte_atomic16_set(&dev->broadcast_rarp, 1);
1042
1043         return 0;
1044 }
1045
1046 static int
1047 vhost_user_net_set_mtu(struct virtio_net *dev, struct VhostUserMsg *msg)
1048 {
1049         if (msg->payload.u64 < VIRTIO_MIN_MTU ||
1050                         msg->payload.u64 > VIRTIO_MAX_MTU) {
1051                 RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n",
1052                                 msg->payload.u64);
1053
1054                 return -1;
1055         }
1056
1057         dev->mtu = msg->payload.u64;
1058
1059         return 0;
1060 }
1061
1062 static int
1063 vhost_user_set_req_fd(struct virtio_net *dev, struct VhostUserMsg *msg)
1064 {
1065         int fd = msg->fds[0];
1066
1067         if (fd < 0) {
1068                 RTE_LOG(ERR, VHOST_CONFIG,
1069                                 "Invalid file descriptor for slave channel (%d)\n",
1070                                 fd);
1071                 return -1;
1072         }
1073
1074         dev->slave_req_fd = fd;
1075
1076         return 0;
1077 }
1078
1079 static int
1080 is_vring_iotlb_update(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
1081 {
1082         struct vhost_vring_addr *ra;
1083         uint64_t start, end;
1084
1085         start = imsg->iova;
1086         end = start + imsg->size;
1087
1088         ra = &vq->ring_addrs;
1089         if (ra->desc_user_addr >= start && ra->desc_user_addr < end)
1090                 return 1;
1091         if (ra->avail_user_addr >= start && ra->avail_user_addr < end)
1092                 return 1;
1093         if (ra->used_user_addr >= start && ra->used_user_addr < end)
1094                 return 1;
1095
1096         return 0;
1097 }
1098
1099 static int
1100 is_vring_iotlb_invalidate(struct vhost_virtqueue *vq,
1101                                 struct vhost_iotlb_msg *imsg)
1102 {
1103         uint64_t istart, iend, vstart, vend;
1104
1105         istart = imsg->iova;
1106         iend = istart + imsg->size - 1;
1107
1108         vstart = (uintptr_t)vq->desc;
1109         vend = vstart + sizeof(struct vring_desc) * vq->size - 1;
1110         if (vstart <= iend && istart <= vend)
1111                 return 1;
1112
1113         vstart = (uintptr_t)vq->avail;
1114         vend = vstart + sizeof(struct vring_avail);
1115         vend += sizeof(uint16_t) * vq->size - 1;
1116         if (vstart <= iend && istart <= vend)
1117                 return 1;
1118
1119         vstart = (uintptr_t)vq->used;
1120         vend = vstart + sizeof(struct vring_used);
1121         vend += sizeof(struct vring_used_elem) * vq->size - 1;
1122         if (vstart <= iend && istart <= vend)
1123                 return 1;
1124
1125         return 0;
1126 }
1127
1128 static int
1129 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg)
1130 {
1131         struct virtio_net *dev = *pdev;
1132         struct vhost_iotlb_msg *imsg = &msg->payload.iotlb;
1133         uint16_t i;
1134         uint64_t vva;
1135
1136         switch (imsg->type) {
1137         case VHOST_IOTLB_UPDATE:
1138                 vva = qva_to_vva(dev, imsg->uaddr);
1139                 if (!vva)
1140                         return -1;
1141
1142                 for (i = 0; i < dev->nr_vring; i++) {
1143                         struct vhost_virtqueue *vq = dev->virtqueue[i];
1144
1145                         vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
1146                                         imsg->size, imsg->perm);
1147
1148                         if (is_vring_iotlb_update(vq, imsg))
1149                                 *pdev = dev = translate_ring_addresses(dev, i);
1150                 }
1151                 break;
1152         case VHOST_IOTLB_INVALIDATE:
1153                 for (i = 0; i < dev->nr_vring; i++) {
1154                         struct vhost_virtqueue *vq = dev->virtqueue[i];
1155
1156                         vhost_user_iotlb_cache_remove(vq, imsg->iova,
1157                                         imsg->size);
1158
1159                         if (is_vring_iotlb_invalidate(vq, imsg))
1160                                 vring_invalidate(dev, vq);
1161                 }
1162                 break;
1163         default:
1164                 RTE_LOG(ERR, VHOST_CONFIG, "Invalid IOTLB message type (%d)\n",
1165                                 imsg->type);
1166                 return -1;
1167         }
1168
1169         return 0;
1170 }
1171
1172 /* return bytes# of read on success or negative val on failure. */
1173 static int
1174 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
1175 {
1176         int ret;
1177
1178         ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
1179                 msg->fds, VHOST_MEMORY_MAX_NREGIONS);
1180         if (ret <= 0)
1181                 return ret;
1182
1183         if (msg && msg->size) {
1184                 if (msg->size > sizeof(msg->payload)) {
1185                         RTE_LOG(ERR, VHOST_CONFIG,
1186                                 "invalid msg size: %d\n", msg->size);
1187                         return -1;
1188                 }
1189                 ret = read(sockfd, &msg->payload, msg->size);
1190                 if (ret <= 0)
1191                         return ret;
1192                 if (ret != (int)msg->size) {
1193                         RTE_LOG(ERR, VHOST_CONFIG,
1194                                 "read control message failed\n");
1195                         return -1;
1196                 }
1197         }
1198
1199         return ret;
1200 }
1201
1202 static int
1203 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
1204 {
1205         if (!msg)
1206                 return 0;
1207
1208         return send_fd_message(sockfd, (char *)msg,
1209                 VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
1210 }
1211
1212 static int
1213 send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
1214 {
1215         if (!msg)
1216                 return 0;
1217
1218         msg->flags &= ~VHOST_USER_VERSION_MASK;
1219         msg->flags &= ~VHOST_USER_NEED_REPLY;
1220         msg->flags |= VHOST_USER_VERSION;
1221         msg->flags |= VHOST_USER_REPLY_MASK;
1222
1223         return send_vhost_message(sockfd, msg);
1224 }
1225
1226 /*
1227  * Allocate a queue pair if it hasn't been allocated yet
1228  */
1229 static int
1230 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, VhostUserMsg *msg)
1231 {
1232         uint16_t vring_idx;
1233
1234         switch (msg->request.master) {
1235         case VHOST_USER_SET_VRING_KICK:
1236         case VHOST_USER_SET_VRING_CALL:
1237         case VHOST_USER_SET_VRING_ERR:
1238                 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1239                 break;
1240         case VHOST_USER_SET_VRING_NUM:
1241         case VHOST_USER_SET_VRING_BASE:
1242         case VHOST_USER_SET_VRING_ENABLE:
1243                 vring_idx = msg->payload.state.index;
1244                 break;
1245         case VHOST_USER_SET_VRING_ADDR:
1246                 vring_idx = msg->payload.addr.index;
1247                 break;
1248         default:
1249                 return 0;
1250         }
1251
1252         if (vring_idx >= VHOST_MAX_VRING) {
1253                 RTE_LOG(ERR, VHOST_CONFIG,
1254                         "invalid vring index: %u\n", vring_idx);
1255                 return -1;
1256         }
1257
1258         if (dev->virtqueue[vring_idx])
1259                 return 0;
1260
1261         return alloc_vring_queue(dev, vring_idx);
1262 }
1263
1264 static void
1265 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
1266 {
1267         unsigned int i = 0;
1268         unsigned int vq_num = 0;
1269
1270         while (vq_num < dev->nr_vring) {
1271                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1272
1273                 if (vq) {
1274                         rte_spinlock_lock(&vq->access_lock);
1275                         vq_num++;
1276                 }
1277                 i++;
1278         }
1279 }
1280
1281 static void
1282 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
1283 {
1284         unsigned int i = 0;
1285         unsigned int vq_num = 0;
1286
1287         while (vq_num < dev->nr_vring) {
1288                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1289
1290                 if (vq) {
1291                         rte_spinlock_unlock(&vq->access_lock);
1292                         vq_num++;
1293                 }
1294                 i++;
1295         }
1296 }
1297
1298 int
1299 vhost_user_msg_handler(int vid, int fd)
1300 {
1301         struct virtio_net *dev;
1302         struct VhostUserMsg msg;
1303         int ret;
1304         int unlock_required = 0;
1305
1306         dev = get_device(vid);
1307         if (dev == NULL)
1308                 return -1;
1309
1310         if (!dev->notify_ops) {
1311                 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
1312                 if (!dev->notify_ops) {
1313                         RTE_LOG(ERR, VHOST_CONFIG,
1314                                 "failed to get callback ops for driver %s\n",
1315                                 dev->ifname);
1316                         return -1;
1317                 }
1318         }
1319
1320         ret = read_vhost_message(fd, &msg);
1321         if (ret <= 0 || msg.request.master >= VHOST_USER_MAX) {
1322                 if (ret < 0)
1323                         RTE_LOG(ERR, VHOST_CONFIG,
1324                                 "vhost read message failed\n");
1325                 else if (ret == 0)
1326                         RTE_LOG(INFO, VHOST_CONFIG,
1327                                 "vhost peer closed\n");
1328                 else
1329                         RTE_LOG(ERR, VHOST_CONFIG,
1330                                 "vhost read incorrect message\n");
1331
1332                 return -1;
1333         }
1334
1335         ret = 0;
1336         if (msg.request.master != VHOST_USER_IOTLB_MSG)
1337                 RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
1338                         vhost_message_str[msg.request.master]);
1339         else
1340                 RTE_LOG(DEBUG, VHOST_CONFIG, "read message %s\n",
1341                         vhost_message_str[msg.request.master]);
1342
1343         ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
1344         if (ret < 0) {
1345                 RTE_LOG(ERR, VHOST_CONFIG,
1346                         "failed to alloc queue\n");
1347                 return -1;
1348         }
1349
1350         /*
1351          * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
1352          * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
1353          * and device is destroyed. destroy_device waits for queues to be
1354          * inactive, so it is safe. Otherwise taking the access_lock
1355          * would cause a dead lock.
1356          */
1357         switch (msg.request.master) {
1358         case VHOST_USER_SET_FEATURES:
1359         case VHOST_USER_SET_PROTOCOL_FEATURES:
1360         case VHOST_USER_SET_OWNER:
1361         case VHOST_USER_SET_MEM_TABLE:
1362         case VHOST_USER_SET_LOG_BASE:
1363         case VHOST_USER_SET_LOG_FD:
1364         case VHOST_USER_SET_VRING_NUM:
1365         case VHOST_USER_SET_VRING_ADDR:
1366         case VHOST_USER_SET_VRING_BASE:
1367         case VHOST_USER_SET_VRING_KICK:
1368         case VHOST_USER_SET_VRING_CALL:
1369         case VHOST_USER_SET_VRING_ERR:
1370         case VHOST_USER_SET_VRING_ENABLE:
1371         case VHOST_USER_SEND_RARP:
1372         case VHOST_USER_NET_SET_MTU:
1373         case VHOST_USER_SET_SLAVE_REQ_FD:
1374                 vhost_user_lock_all_queue_pairs(dev);
1375                 unlock_required = 1;
1376                 break;
1377         default:
1378                 break;
1379
1380         }
1381
1382         switch (msg.request.master) {
1383         case VHOST_USER_GET_FEATURES:
1384                 msg.payload.u64 = vhost_user_get_features(dev);
1385                 msg.size = sizeof(msg.payload.u64);
1386                 send_vhost_reply(fd, &msg);
1387                 break;
1388         case VHOST_USER_SET_FEATURES:
1389                 ret = vhost_user_set_features(dev, msg.payload.u64);
1390                 if (ret)
1391                         return -1;
1392                 break;
1393
1394         case VHOST_USER_GET_PROTOCOL_FEATURES:
1395                 vhost_user_get_protocol_features(dev, &msg);
1396                 send_vhost_reply(fd, &msg);
1397                 break;
1398         case VHOST_USER_SET_PROTOCOL_FEATURES:
1399                 vhost_user_set_protocol_features(dev, msg.payload.u64);
1400                 break;
1401
1402         case VHOST_USER_SET_OWNER:
1403                 vhost_user_set_owner();
1404                 break;
1405         case VHOST_USER_RESET_OWNER:
1406                 vhost_user_reset_owner(dev);
1407                 break;
1408
1409         case VHOST_USER_SET_MEM_TABLE:
1410                 ret = vhost_user_set_mem_table(dev, &msg);
1411                 break;
1412
1413         case VHOST_USER_SET_LOG_BASE:
1414                 vhost_user_set_log_base(dev, &msg);
1415
1416                 /* it needs a reply */
1417                 msg.size = sizeof(msg.payload.u64);
1418                 send_vhost_reply(fd, &msg);
1419                 break;
1420         case VHOST_USER_SET_LOG_FD:
1421                 close(msg.fds[0]);
1422                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
1423                 break;
1424
1425         case VHOST_USER_SET_VRING_NUM:
1426                 vhost_user_set_vring_num(dev, &msg);
1427                 break;
1428         case VHOST_USER_SET_VRING_ADDR:
1429                 vhost_user_set_vring_addr(&dev, &msg);
1430                 break;
1431         case VHOST_USER_SET_VRING_BASE:
1432                 vhost_user_set_vring_base(dev, &msg);
1433                 break;
1434
1435         case VHOST_USER_GET_VRING_BASE:
1436                 vhost_user_get_vring_base(dev, &msg);
1437                 msg.size = sizeof(msg.payload.state);
1438                 send_vhost_reply(fd, &msg);
1439                 break;
1440
1441         case VHOST_USER_SET_VRING_KICK:
1442                 vhost_user_set_vring_kick(&dev, &msg);
1443                 break;
1444         case VHOST_USER_SET_VRING_CALL:
1445                 vhost_user_set_vring_call(dev, &msg);
1446                 break;
1447
1448         case VHOST_USER_SET_VRING_ERR:
1449                 if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1450                         close(msg.fds[0]);
1451                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
1452                 break;
1453
1454         case VHOST_USER_GET_QUEUE_NUM:
1455                 msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
1456                 msg.size = sizeof(msg.payload.u64);
1457                 send_vhost_reply(fd, &msg);
1458                 break;
1459
1460         case VHOST_USER_SET_VRING_ENABLE:
1461                 vhost_user_set_vring_enable(dev, &msg);
1462                 break;
1463         case VHOST_USER_SEND_RARP:
1464                 vhost_user_send_rarp(dev, &msg);
1465                 break;
1466
1467         case VHOST_USER_NET_SET_MTU:
1468                 ret = vhost_user_net_set_mtu(dev, &msg);
1469                 break;
1470
1471         case VHOST_USER_SET_SLAVE_REQ_FD:
1472                 ret = vhost_user_set_req_fd(dev, &msg);
1473                 break;
1474
1475         case VHOST_USER_IOTLB_MSG:
1476                 ret = vhost_user_iotlb_msg(&dev, &msg);
1477                 break;
1478
1479         default:
1480                 ret = -1;
1481                 break;
1482
1483         }
1484
1485         if (unlock_required)
1486                 vhost_user_unlock_all_queue_pairs(dev);
1487
1488         if (msg.flags & VHOST_USER_NEED_REPLY) {
1489                 msg.payload.u64 = !!ret;
1490                 msg.size = sizeof(msg.payload.u64);
1491                 send_vhost_reply(fd, &msg);
1492         }
1493
1494         if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) {
1495                 dev->flags |= VIRTIO_DEV_READY;
1496
1497                 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
1498                         if (dev->dequeue_zero_copy) {
1499                                 RTE_LOG(INFO, VHOST_CONFIG,
1500                                                 "dequeue zero copy is enabled\n");
1501                         }
1502
1503                         if (dev->notify_ops->new_device(dev->vid) == 0)
1504                                 dev->flags |= VIRTIO_DEV_RUNNING;
1505                 }
1506         }
1507
1508         return 0;
1509 }
1510
1511 int
1512 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
1513 {
1514         int ret;
1515         struct VhostUserMsg msg = {
1516                 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
1517                 .flags = VHOST_USER_VERSION,
1518                 .size = sizeof(msg.payload.iotlb),
1519                 .payload.iotlb = {
1520                         .iova = iova,
1521                         .perm = perm,
1522                         .type = VHOST_IOTLB_MISS,
1523                 },
1524         };
1525
1526         ret = send_vhost_message(dev->slave_req_fd, &msg);
1527         if (ret < 0) {
1528                 RTE_LOG(ERR, VHOST_CONFIG,
1529                                 "Failed to send IOTLB miss message (%d)\n",
1530                                 ret);
1531                 return ret;
1532         }
1533
1534         return 0;
1535 }