lib/librte_vhost/vhost_user.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2018 Intel Corporation
   3  */
   4
   5 /* Security model
   6  * --------------
   7  * The vhost-user protocol connection is an external interface, so it must be
   8  * robust against invalid inputs.
   9  *
  10  * This is important because the vhost-user master is only one step removed
  11  * from the guest.  Malicious guests that have escaped will then launch further
  12  * attacks from the vhost-user master.
  13  *
  14  * Even in deployments where guests are trusted, a bug in the vhost-user master
  15  * can still cause invalid messages to be sent.  Such messages must not
  16  * compromise the stability of the DPDK application by causing crashes, memory
  17  * corruption, or other problematic behavior.
  18  *
  19  * Do not assume received VhostUserMsg fields contain sensible values!
  20  */
  21
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <sys/mman.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <assert.h>
  31 #ifdef RTE_LIBRTE_VHOST_NUMA
  32 #include <numaif.h>
  33 #endif
  34
  35 #include <rte_common.h>
  36 #include <rte_malloc.h>
  37 #include <rte_log.h>
  38
  39 #include "iotlb.h"
  40 #include "vhost.h"
  41 #include "vhost_user.h"
  42
  43 #define VIRTIO_MIN_MTU 68
  44 #define VIRTIO_MAX_MTU 65535
  45
  46 static const char *vhost_message_str[VHOST_USER_MAX] = {
  47         [VHOST_USER_NONE] = "VHOST_USER_NONE",
  48         [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
  49         [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
  50         [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
  51         [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
  52         [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
  53         [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
  54         [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
  55         [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
  56         [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
  57         [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
  58         [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
  59         [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
  60         [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
  61         [VHOST_USER_SET_VRING_ERR]  = "VHOST_USER_SET_VRING_ERR",
  62         [VHOST_USER_GET_PROTOCOL_FEATURES]  = "VHOST_USER_GET_PROTOCOL_FEATURES",
  63         [VHOST_USER_SET_PROTOCOL_FEATURES]  = "VHOST_USER_SET_PROTOCOL_FEATURES",
  64         [VHOST_USER_GET_QUEUE_NUM]  = "VHOST_USER_GET_QUEUE_NUM",
  65         [VHOST_USER_SET_VRING_ENABLE]  = "VHOST_USER_SET_VRING_ENABLE",
  66         [VHOST_USER_SEND_RARP]  = "VHOST_USER_SEND_RARP",
  67         [VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
  68         [VHOST_USER_SET_SLAVE_REQ_FD]  = "VHOST_USER_SET_SLAVE_REQ_FD",
  69         [VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
  70         [VHOST_USER_CRYPTO_CREATE_SESS] = "VHOST_USER_CRYPTO_CREATE_SESS",
  71         [VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
  72 };
  73
  74 static uint64_t
  75 get_blk_size(int fd)
  76 {
  77         struct stat stat;
  78         int ret;
  79
  80         ret = fstat(fd, &stat);
  81         return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
  82 }
  83
  84 static void
  85 free_mem_region(struct virtio_net *dev)
  86 {
  87         uint32_t i;
  88         struct rte_vhost_mem_region *reg;
  89
  90         if (!dev || !dev->mem)
  91                 return;
  92
  93         for (i = 0; i < dev->mem->nregions; i++) {
  94                 reg = &dev->mem->regions[i];
  95                 if (reg->host_user_addr) {
  96                         munmap(reg->mmap_addr, reg->mmap_size);
  97                         close(reg->fd);
  98                 }
  99         }
 100 }
 101
 102 void
 103 vhost_backend_cleanup(struct virtio_net *dev)
 104 {
 105         if (dev->mem) {
 106                 free_mem_region(dev);
 107                 rte_free(dev->mem);
 108                 dev->mem = NULL;
 109         }
 110
 111         free(dev->guest_pages);
 112         dev->guest_pages = NULL;
 113
 114         if (dev->log_addr) {
 115                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 116                 dev->log_addr = 0;
 117         }
 118
 119         if (dev->slave_req_fd >= 0) {
 120                 close(dev->slave_req_fd);
 121                 dev->slave_req_fd = -1;
 122         }
 123 }
 124
 125 /*
 126  * This function just returns success at the moment unless
 127  * the device hasn't been initialised.
 128  */
 129 static int
 130 vhost_user_set_owner(void)
 131 {
 132         return 0;
 133 }
 134
 135 static int
 136 vhost_user_reset_owner(struct virtio_net *dev)
 137 {
 138         vhost_destroy_device_notify(dev);
 139
 140         cleanup_device(dev, 0);
 141         reset_device(dev);
 142         return 0;
 143 }
 144
 145 /*
 146  * The features that we support are requested.
 147  */
 148 static uint64_t
 149 vhost_user_get_features(struct virtio_net *dev)
 150 {
 151         uint64_t features = 0;
 152
 153         rte_vhost_driver_get_features(dev->ifname, &features);
 154         return features;
 155 }
 156
 157 /*
 158  * The queue number that we support are requested.
 159  */
 160 static uint32_t
 161 vhost_user_get_queue_num(struct virtio_net *dev)
 162 {
 163         uint32_t queue_num = 0;
 164
 165         rte_vhost_driver_get_queue_num(dev->ifname, &queue_num);
 166         return queue_num;
 167 }
 168
 169 /*
 170  * We receive the negotiated features supported by us and the virtio device.
 171  */
 172 static int
 173 vhost_user_set_features(struct virtio_net *dev, uint64_t features)
 174 {
 175         uint64_t vhost_features = 0;
 176         struct rte_vdpa_device *vdpa_dev;
 177         int did = -1;
 178
 179         rte_vhost_driver_get_features(dev->ifname, &vhost_features);
 180         if (features & ~vhost_features) {
 181                 RTE_LOG(ERR, VHOST_CONFIG,
 182                         "(%d) received invalid negotiated features.\n",
 183                         dev->vid);
 184                 return -1;
 185         }
 186
 187         if (dev->flags & VIRTIO_DEV_RUNNING) {
 188                 if (dev->features == features)
 189                         return 0;
 190
 191                 /*
 192                  * Error out if master tries to change features while device is
 193                  * in running state. The exception being VHOST_F_LOG_ALL, which
 194                  * is enabled when the live-migration starts.
 195                  */
 196                 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) {
 197                         RTE_LOG(ERR, VHOST_CONFIG,
 198                                 "(%d) features changed while device is running.\n",
 199                                 dev->vid);
 200                         return -1;
 201                 }
 202
 203                 if (dev->notify_ops->features_changed)
 204                         dev->notify_ops->features_changed(dev->vid, features);
 205         }
 206
 207         dev->features = features;
 208         if (dev->features &
 209                 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
 210                 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 211         } else {
 212                 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
 213         }
 214         VHOST_LOG_DEBUG(VHOST_CONFIG,
 215                 "(%d) mergeable RX buffers %s, virtio 1 %s\n",
 216                 dev->vid,
 217                 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
 218                 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 219
 220         if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
 221             !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
 222                 /*
 223                  * Remove all but first queue pair if MQ hasn't been
 224                  * negotiated. This is safe because the device is not
 225                  * running at this stage.
 226                  */
 227                 while (dev->nr_vring > 2) {
 228                         struct vhost_virtqueue *vq;
 229
 230                         vq = dev->virtqueue[--dev->nr_vring];
 231                         if (!vq)
 232                                 continue;
 233
 234                         dev->virtqueue[dev->nr_vring] = NULL;
 235                         cleanup_vq(vq, 1);
 236                         free_vq(dev, vq);
 237                 }
 238         }
 239
 240         did = dev->vdpa_dev_id;
 241         vdpa_dev = rte_vdpa_get_device(did);
 242         if (vdpa_dev && vdpa_dev->ops->set_features)
 243                 vdpa_dev->ops->set_features(dev->vid);
 244
 245         return 0;
 246 }
 247
 248 /*
 249  * The virtio device sends us the size of the descriptor ring.
 250  */
 251 static int
 252 vhost_user_set_vring_num(struct virtio_net *dev,
 253                          VhostUserMsg *msg)
 254 {
 255         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 256
 257         vq->size = msg->payload.state.num;
 258
 259         /* VIRTIO 1.0, 2.4 Virtqueues says:
 260          *
 261          *   Queue Size value is always a power of 2. The maximum Queue Size
 262          *   value is 32768.
 263          */
 264         if ((vq->size & (vq->size - 1)) || vq->size > 32768) {
 265                 RTE_LOG(ERR, VHOST_CONFIG,
 266                         "invalid virtqueue size %u\n", vq->size);
 267                 return -1;
 268         }
 269
 270         if (dev->dequeue_zero_copy) {
 271                 vq->nr_zmbuf = 0;
 272                 vq->last_zmbuf_idx = 0;
 273                 vq->zmbuf_size = vq->size;
 274                 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
 275                                          sizeof(struct zcopy_mbuf), 0);
 276                 if (vq->zmbufs == NULL) {
 277                         RTE_LOG(WARNING, VHOST_CONFIG,
 278                                 "failed to allocate mem for zero copy; "
 279                                 "zero copy is force disabled\n");
 280                         dev->dequeue_zero_copy = 0;
 281                 }
 282                 TAILQ_INIT(&vq->zmbuf_list);
 283         }
 284
 285         if (vq_is_packed(dev)) {
 286                 vq->shadow_used_packed = rte_malloc(NULL,
 287                                 vq->size *
 288                                 sizeof(struct vring_used_elem_packed),
 289                                 RTE_CACHE_LINE_SIZE);
 290                 if (!vq->shadow_used_packed) {
 291                         RTE_LOG(ERR, VHOST_CONFIG,
 292                                         "failed to allocate memory for shadow used ring.\n");
 293                         return -1;
 294                 }
 295
 296         } else {
 297                 vq->shadow_used_split = rte_malloc(NULL,
 298                                 vq->size * sizeof(struct vring_used_elem),
 299                                 RTE_CACHE_LINE_SIZE);
 300                 if (!vq->shadow_used_split) {
 301                         RTE_LOG(ERR, VHOST_CONFIG,
 302                                         "failed to allocate memory for shadow used ring.\n");
 303                         return -1;
 304                 }
 305         }
 306
 307         vq->batch_copy_elems = rte_malloc(NULL,
 308                                 vq->size * sizeof(struct batch_copy_elem),
 309                                 RTE_CACHE_LINE_SIZE);
 310         if (!vq->batch_copy_elems) {
 311                 RTE_LOG(ERR, VHOST_CONFIG,
 312                         "failed to allocate memory for batching copy.\n");
 313                 return -1;
 314         }
 315
 316         return 0;
 317 }
 318
 319 /*
 320  * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
 321  * same numa node as the memory of vring descriptor.
 322  */
 323 #ifdef RTE_LIBRTE_VHOST_NUMA
 324 static struct virtio_net*
 325 numa_realloc(struct virtio_net *dev, int index)
 326 {
 327         int oldnode, newnode;
 328         struct virtio_net *old_dev;
 329         struct vhost_virtqueue *old_vq, *vq;
 330         struct zcopy_mbuf *new_zmbuf;
 331         struct vring_used_elem *new_shadow_used_split;
 332         struct vring_used_elem_packed *new_shadow_used_packed;
 333         struct batch_copy_elem *new_batch_copy_elems;
 334         int ret;
 335
 336         old_dev = dev;
 337         vq = old_vq = dev->virtqueue[index];
 338
 339         ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
 340                             MPOL_F_NODE | MPOL_F_ADDR);
 341
 342         /* check if we need to reallocate vq */
 343         ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
 344                              MPOL_F_NODE | MPOL_F_ADDR);
 345         if (ret) {
 346                 RTE_LOG(ERR, VHOST_CONFIG,
 347                         "Unable to get vq numa information.\n");
 348                 return dev;
 349         }
 350         if (oldnode != newnode) {
 351                 RTE_LOG(INFO, VHOST_CONFIG,
 352                         "reallocate vq from %d to %d node\n", oldnode, newnode);
 353                 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
 354                 if (!vq)
 355                         return dev;
 356
 357                 memcpy(vq, old_vq, sizeof(*vq));
 358                 TAILQ_INIT(&vq->zmbuf_list);
 359
 360                 new_zmbuf = rte_malloc_socket(NULL, vq->zmbuf_size *
 361                         sizeof(struct zcopy_mbuf), 0, newnode);
 362                 if (new_zmbuf) {
 363                         rte_free(vq->zmbufs);
 364                         vq->zmbufs = new_zmbuf;
 365                 }
 366
 367                 if (vq_is_packed(dev)) {
 368                         new_shadow_used_packed = rte_malloc_socket(NULL,
 369                                         vq->size *
 370                                         sizeof(struct vring_used_elem_packed),
 371                                         RTE_CACHE_LINE_SIZE,
 372                                         newnode);
 373                         if (new_shadow_used_packed) {
 374                                 rte_free(vq->shadow_used_packed);
 375                                 vq->shadow_used_packed = new_shadow_used_packed;
 376                         }
 377                 } else {
 378                         new_shadow_used_split = rte_malloc_socket(NULL,
 379                                         vq->size *
 380                                         sizeof(struct vring_used_elem),
 381                                         RTE_CACHE_LINE_SIZE,
 382                                         newnode);
 383                         if (new_shadow_used_split) {
 384                                 rte_free(vq->shadow_used_split);
 385                                 vq->shadow_used_split = new_shadow_used_split;
 386                         }
 387                 }
 388
 389                 new_batch_copy_elems = rte_malloc_socket(NULL,
 390                         vq->size * sizeof(struct batch_copy_elem),
 391                         RTE_CACHE_LINE_SIZE,
 392                         newnode);
 393                 if (new_batch_copy_elems) {
 394                         rte_free(vq->batch_copy_elems);
 395                         vq->batch_copy_elems = new_batch_copy_elems;
 396                 }
 397
 398                 rte_free(old_vq);
 399         }
 400
 401         /* check if we need to reallocate dev */
 402         ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
 403                             MPOL_F_NODE | MPOL_F_ADDR);
 404         if (ret) {
 405                 RTE_LOG(ERR, VHOST_CONFIG,
 406                         "Unable to get dev numa information.\n");
 407                 goto out;
 408         }
 409         if (oldnode != newnode) {
 410                 RTE_LOG(INFO, VHOST_CONFIG,
 411                         "reallocate dev from %d to %d node\n",
 412                         oldnode, newnode);
 413                 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
 414                 if (!dev) {
 415                         dev = old_dev;
 416                         goto out;
 417                 }
 418
 419                 memcpy(dev, old_dev, sizeof(*dev));
 420                 rte_free(old_dev);
 421         }
 422
 423 out:
 424         dev->virtqueue[index] = vq;
 425         vhost_devices[dev->vid] = dev;
 426
 427         if (old_vq != vq)
 428                 vhost_user_iotlb_init(dev, index);
 429
 430         return dev;
 431 }
 432 #else
 433 static struct virtio_net*
 434 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 435 {
 436         return dev;
 437 }
 438 #endif
 439
 440 /* Converts QEMU virtual address to Vhost virtual address. */
 441 static uint64_t
 442 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
 443 {
 444         struct rte_vhost_mem_region *r;
 445         uint32_t i;
 446
 447         /* Find the region where the address lives. */
 448         for (i = 0; i < dev->mem->nregions; i++) {
 449                 r = &dev->mem->regions[i];
 450
 451                 if (qva >= r->guest_user_addr &&
 452                     qva <  r->guest_user_addr + r->size) {
 453
 454                         if (unlikely(*len > r->guest_user_addr + r->size - qva))
 455                                 *len = r->guest_user_addr + r->size - qva;
 456
 457                         return qva - r->guest_user_addr +
 458                                r->host_user_addr;
 459                 }
 460         }
 461         *len = 0;
 462
 463         return 0;
 464 }
 465
 466
 467 /*
 468  * Converts ring address to Vhost virtual address.
 469  * If IOMMU is enabled, the ring address is a guest IO virtual address,
 470  * else it is a QEMU virtual address.
 471  */
 472 static uint64_t
 473 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 474                 uint64_t ra, uint64_t *size)
 475 {
 476         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 477                 uint64_t vva;
 478
 479                 vva = vhost_user_iotlb_cache_find(vq, ra,
 480                                         size, VHOST_ACCESS_RW);
 481                 if (!vva)
 482                         vhost_user_iotlb_miss(dev, ra, VHOST_ACCESS_RW);
 483
 484                 return vva;
 485         }
 486
 487         return qva_to_vva(dev, ra, size);
 488 }
 489
 490 static struct virtio_net *
 491 translate_ring_addresses(struct virtio_net *dev, int vq_index)
 492 {
 493         struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 494         struct vhost_vring_addr *addr = &vq->ring_addrs;
 495         uint64_t len;
 496
 497         if (vq_is_packed(dev)) {
 498                 len = sizeof(struct vring_packed_desc) * vq->size;
 499                 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 500                         ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len);
 501                 vq->log_guest_addr = 0;
 502                 if (vq->desc_packed == NULL ||
 503                                 len != sizeof(struct vring_packed_desc) *
 504                                 vq->size) {
 505                         RTE_LOG(DEBUG, VHOST_CONFIG,
 506                                 "(%d) failed to map desc_packed ring.\n",
 507                                 dev->vid);
 508                         return dev;
 509                 }
 510
 511                 dev = numa_realloc(dev, vq_index);
 512                 vq = dev->virtqueue[vq_index];
 513                 addr = &vq->ring_addrs;
 514
 515                 len = sizeof(struct vring_packed_desc_event);
 516                 vq->driver_event = (struct vring_packed_desc_event *)
 517                                         (uintptr_t)ring_addr_to_vva(dev,
 518                                         vq, addr->avail_user_addr, &len);
 519                 if (vq->driver_event == NULL ||
 520                                 len != sizeof(struct vring_packed_desc_event)) {
 521                         RTE_LOG(DEBUG, VHOST_CONFIG,
 522                                 "(%d) failed to find driver area address.\n",
 523                                 dev->vid);
 524                         return dev;
 525                 }
 526
 527                 len = sizeof(struct vring_packed_desc_event);
 528                 vq->device_event = (struct vring_packed_desc_event *)
 529                                         (uintptr_t)ring_addr_to_vva(dev,
 530                                         vq, addr->used_user_addr, &len);
 531                 if (vq->device_event == NULL ||
 532                                 len != sizeof(struct vring_packed_desc_event)) {
 533                         RTE_LOG(DEBUG, VHOST_CONFIG,
 534                                 "(%d) failed to find device area address.\n",
 535                                 dev->vid);
 536                         return dev;
 537                 }
 538
 539                 return dev;
 540         }
 541
 542         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 543         if (vq->desc && vq->avail && vq->used)
 544                 return dev;
 545
 546         len = sizeof(struct vring_desc) * vq->size;
 547         vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
 548                         vq, addr->desc_user_addr, &len);
 549         if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
 550                 RTE_LOG(DEBUG, VHOST_CONFIG,
 551                         "(%d) failed to map desc ring.\n",
 552                         dev->vid);
 553                 return dev;
 554         }
 555
 556         dev = numa_realloc(dev, vq_index);
 557         vq = dev->virtqueue[vq_index];
 558         addr = &vq->ring_addrs;
 559
 560         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
 561         vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
 562                         vq, addr->avail_user_addr, &len);
 563         if (vq->avail == 0 ||
 564                         len != sizeof(struct vring_avail) +
 565                         sizeof(uint16_t) * vq->size) {
 566                 RTE_LOG(DEBUG, VHOST_CONFIG,
 567                         "(%d) failed to map avail ring.\n",
 568                         dev->vid);
 569                 return dev;
 570         }
 571
 572         len = sizeof(struct vring_used) +
 573                 sizeof(struct vring_used_elem) * vq->size;
 574         vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
 575                         vq, addr->used_user_addr, &len);
 576         if (vq->used == 0 || len != sizeof(struct vring_used) +
 577                         sizeof(struct vring_used_elem) * vq->size) {
 578                 RTE_LOG(DEBUG, VHOST_CONFIG,
 579                         "(%d) failed to map used ring.\n",
 580                         dev->vid);
 581                 return dev;
 582         }
 583
 584         if (vq->last_used_idx != vq->used->idx) {
 585                 RTE_LOG(WARNING, VHOST_CONFIG,
 586                         "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
 587                         "some packets maybe resent for Tx and dropped for Rx\n",
 588                         vq->last_used_idx, vq->used->idx);
 589                 vq->last_used_idx  = vq->used->idx;
 590                 vq->last_avail_idx = vq->used->idx;
 591         }
 592
 593         vq->log_guest_addr = addr->log_guest_addr;
 594
 595         VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
 596                         dev->vid, vq->desc);
 597         VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n",
 598                         dev->vid, vq->avail);
 599         VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n",
 600                         dev->vid, vq->used);
 601         VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
 602                         dev->vid, vq->log_guest_addr);
 603
 604         return dev;
 605 }
 606
 607 /*
 608  * The virtio device sends us the desc, used and avail ring addresses.
 609  * This function then converts these to our address space.
 610  */
 611 static int
 612 vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
 613 {
 614         struct vhost_virtqueue *vq;
 615         struct vhost_vring_addr *addr = &msg->payload.addr;
 616         struct virtio_net *dev = *pdev;
 617
 618         if (dev->mem == NULL)
 619                 return -1;
 620
 621         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 622         vq = dev->virtqueue[msg->payload.addr.index];
 623
 624         /*
 625          * Rings addresses should not be interpreted as long as the ring is not
 626          * started and enabled
 627          */
 628         memcpy(&vq->ring_addrs, addr, sizeof(*addr));
 629
 630         vring_invalidate(dev, vq);
 631
 632         if (vq->enabled && (dev->features &
 633                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
 634                 dev = translate_ring_addresses(dev, msg->payload.addr.index);
 635                 if (!dev)
 636                         return -1;
 637
 638                 *pdev = dev;
 639         }
 640
 641         return 0;
 642 }
 643
 644 /*
 645  * The virtio device sends us the available ring last used index.
 646  */
 647 static int
 648 vhost_user_set_vring_base(struct virtio_net *dev,
 649                           VhostUserMsg *msg)
 650 {
 651         dev->virtqueue[msg->payload.state.index]->last_used_idx  =
 652                         msg->payload.state.num;
 653         dev->virtqueue[msg->payload.state.index]->last_avail_idx =
 654                         msg->payload.state.num;
 655
 656         return 0;
 657 }
 658
 659 static int
 660 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 661                    uint64_t host_phys_addr, uint64_t size)
 662 {
 663         struct guest_page *page, *last_page;
 664
 665         if (dev->nr_guest_pages == dev->max_guest_pages) {
 666                 dev->max_guest_pages *= 2;
 667                 dev->guest_pages = realloc(dev->guest_pages,
 668                                         dev->max_guest_pages * sizeof(*page));
 669                 if (!dev->guest_pages) {
 670                         RTE_LOG(ERR, VHOST_CONFIG, "cannot realloc guest_pages\n");
 671                         return -1;
 672                 }
 673         }
 674
 675         if (dev->nr_guest_pages > 0) {
 676                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
 677                 /* merge if the two pages are continuous */
 678                 if (host_phys_addr == last_page->host_phys_addr +
 679                                       last_page->size) {
 680                         last_page->size += size;
 681                         return 0;
 682                 }
 683         }
 684
 685         page = &dev->guest_pages[dev->nr_guest_pages++];
 686         page->guest_phys_addr = guest_phys_addr;
 687         page->host_phys_addr  = host_phys_addr;
 688         page->size = size;
 689
 690         return 0;
 691 }
 692
 693 static int
 694 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
 695                 uint64_t page_size)
 696 {
 697         uint64_t reg_size = reg->size;
 698         uint64_t host_user_addr  = reg->host_user_addr;
 699         uint64_t guest_phys_addr = reg->guest_phys_addr;
 700         uint64_t host_phys_addr;
 701         uint64_t size;
 702
 703         host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
 704         size = page_size - (guest_phys_addr & (page_size - 1));
 705         size = RTE_MIN(size, reg_size);
 706
 707         if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size) < 0)
 708                 return -1;
 709
 710         host_user_addr  += size;
 711         guest_phys_addr += size;
 712         reg_size -= size;
 713
 714         while (reg_size > 0) {
 715                 size = RTE_MIN(reg_size, page_size);
 716                 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
 717                                                   host_user_addr);
 718                 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
 719                                 size) < 0)
 720                         return -1;
 721
 722                 host_user_addr  += size;
 723                 guest_phys_addr += size;
 724                 reg_size -= size;
 725         }
 726
 727         return 0;
 728 }
 729
 730 #ifdef RTE_LIBRTE_VHOST_DEBUG
 731 /* TODO: enable it only in debug mode? */
 732 static void
 733 dump_guest_pages(struct virtio_net *dev)
 734 {
 735         uint32_t i;
 736         struct guest_page *page;
 737
 738         for (i = 0; i < dev->nr_guest_pages; i++) {
 739                 page = &dev->guest_pages[i];
 740
 741                 RTE_LOG(INFO, VHOST_CONFIG,
 742                         "guest physical page region %u\n"
 743                         "\t guest_phys_addr: %" PRIx64 "\n"
 744                         "\t host_phys_addr : %" PRIx64 "\n"
 745                         "\t size           : %" PRIx64 "\n",
 746                         i,
 747                         page->guest_phys_addr,
 748                         page->host_phys_addr,
 749                         page->size);
 750         }
 751 }
 752 #else
 753 #define dump_guest_pages(dev)
 754 #endif
 755
 756 static bool
 757 vhost_memory_changed(struct VhostUserMemory *new,
 758                      struct rte_vhost_memory *old)
 759 {
 760         uint32_t i;
 761
 762         if (new->nregions != old->nregions)
 763                 return true;
 764
 765         for (i = 0; i < new->nregions; ++i) {
 766                 VhostUserMemoryRegion *new_r = &new->regions[i];
 767                 struct rte_vhost_mem_region *old_r = &old->regions[i];
 768
 769                 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
 770                         return true;
 771                 if (new_r->memory_size != old_r->size)
 772                         return true;
 773                 if (new_r->userspace_addr != old_r->guest_user_addr)
 774                         return true;
 775         }
 776
 777         return false;
 778 }
 779
 780 static int
 781 vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *pmsg)
 782 {
 783         struct virtio_net *dev = *pdev;
 784         struct VhostUserMemory memory = pmsg->payload.memory;
 785         struct rte_vhost_mem_region *reg;
 786         void *mmap_addr;
 787         uint64_t mmap_size;
 788         uint64_t mmap_offset;
 789         uint64_t alignment;
 790         uint32_t i;
 791         int populate;
 792         int fd;
 793
 794         if (memory.nregions > VHOST_MEMORY_MAX_NREGIONS) {
 795                 RTE_LOG(ERR, VHOST_CONFIG,
 796                         "too many memory regions (%u)\n", memory.nregions);
 797                 return -1;
 798         }
 799
 800         if (dev->mem && !vhost_memory_changed(&memory, dev->mem)) {
 801                 RTE_LOG(INFO, VHOST_CONFIG,
 802                         "(%d) memory regions not changed\n", dev->vid);
 803
 804                 for (i = 0; i < memory.nregions; i++)
 805                         close(pmsg->fds[i]);
 806
 807                 return 0;
 808         }
 809
 810         if (dev->mem) {
 811                 free_mem_region(dev);
 812                 rte_free(dev->mem);
 813                 dev->mem = NULL;
 814         }
 815
 816         /* Flush IOTLB cache as previous HVAs are now invalid */
 817         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 818                 for (i = 0; i < dev->nr_vring; i++)
 819                         vhost_user_iotlb_flush_all(dev->virtqueue[i]);
 820
 821         dev->nr_guest_pages = 0;
 822         if (!dev->guest_pages) {
 823                 dev->max_guest_pages = 8;
 824                 dev->guest_pages = malloc(dev->max_guest_pages *
 825                                                 sizeof(struct guest_page));
 826                 if (dev->guest_pages == NULL) {
 827                         RTE_LOG(ERR, VHOST_CONFIG,
 828                                 "(%d) failed to allocate memory "
 829                                 "for dev->guest_pages\n",
 830                                 dev->vid);
 831                         return -1;
 832                 }
 833         }
 834
 835         dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
 836                 sizeof(struct rte_vhost_mem_region) * memory.nregions, 0);
 837         if (dev->mem == NULL) {
 838                 RTE_LOG(ERR, VHOST_CONFIG,
 839                         "(%d) failed to allocate memory for dev->mem\n",
 840                         dev->vid);
 841                 return -1;
 842         }
 843         dev->mem->nregions = memory.nregions;
 844
 845         for (i = 0; i < memory.nregions; i++) {
 846                 fd  = pmsg->fds[i];
 847                 reg = &dev->mem->regions[i];
 848
 849                 reg->guest_phys_addr = memory.regions[i].guest_phys_addr;
 850                 reg->guest_user_addr = memory.regions[i].userspace_addr;
 851                 reg->size            = memory.regions[i].memory_size;
 852                 reg->fd              = fd;
 853
 854                 mmap_offset = memory.regions[i].mmap_offset;
 855
 856                 /* Check for memory_size + mmap_offset overflow */
 857                 if (mmap_offset >= -reg->size) {
 858                         RTE_LOG(ERR, VHOST_CONFIG,
 859                                 "mmap_offset (%#"PRIx64") and memory_size "
 860                                 "(%#"PRIx64") overflow\n",
 861                                 mmap_offset, reg->size);
 862                         goto err_mmap;
 863                 }
 864
 865                 mmap_size = reg->size + mmap_offset;
 866
 867                 /* mmap() without flag of MAP_ANONYMOUS, should be called
 868                  * with length argument aligned with hugepagesz at older
 869                  * longterm version Linux, like 2.6.32 and 3.2.72, or
 870                  * mmap() will fail with EINVAL.
 871                  *
 872                  * to avoid failure, make sure in caller to keep length
 873                  * aligned.
 874                  */
 875                 alignment = get_blk_size(fd);
 876                 if (alignment == (uint64_t)-1) {
 877                         RTE_LOG(ERR, VHOST_CONFIG,
 878                                 "couldn't get hugepage size through fstat\n");
 879                         goto err_mmap;
 880                 }
 881                 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
 882
 883                 populate = (dev->dequeue_zero_copy) ? MAP_POPULATE : 0;
 884                 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
 885                                  MAP_SHARED | populate, fd, 0);
 886
 887                 if (mmap_addr == MAP_FAILED) {
 888                         RTE_LOG(ERR, VHOST_CONFIG,
 889                                 "mmap region %u failed.\n", i);
 890                         goto err_mmap;
 891                 }
 892
 893                 reg->mmap_addr = mmap_addr;
 894                 reg->mmap_size = mmap_size;
 895                 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
 896                                       mmap_offset;
 897
 898                 if (dev->dequeue_zero_copy)
 899                         if (add_guest_pages(dev, reg, alignment) < 0) {
 900                                 RTE_LOG(ERR, VHOST_CONFIG,
 901                                         "adding guest pages to region %u failed.\n",
 902                                         i);
 903                                 goto err_mmap;
 904                         }
 905
 906                 RTE_LOG(INFO, VHOST_CONFIG,
 907                         "guest memory region %u, size: 0x%" PRIx64 "\n"
 908                         "\t guest physical addr: 0x%" PRIx64 "\n"
 909                         "\t guest virtual  addr: 0x%" PRIx64 "\n"
 910                         "\t host  virtual  addr: 0x%" PRIx64 "\n"
 911                         "\t mmap addr : 0x%" PRIx64 "\n"
 912                         "\t mmap size : 0x%" PRIx64 "\n"
 913                         "\t mmap align: 0x%" PRIx64 "\n"
 914                         "\t mmap off  : 0x%" PRIx64 "\n",
 915                         i, reg->size,
 916                         reg->guest_phys_addr,
 917                         reg->guest_user_addr,
 918                         reg->host_user_addr,
 919                         (uint64_t)(uintptr_t)mmap_addr,
 920                         mmap_size,
 921                         alignment,
 922                         mmap_offset);
 923         }
 924
 925         for (i = 0; i < dev->nr_vring; i++) {
 926                 struct vhost_virtqueue *vq = dev->virtqueue[i];
 927
 928                 if (vq->desc || vq->avail || vq->used) {
 929                         /*
 930                          * If the memory table got updated, the ring addresses
 931                          * need to be translated again as virtual addresses have
 932                          * changed.
 933                          */
 934                         vring_invalidate(dev, vq);
 935
 936                         dev = translate_ring_addresses(dev, i);
 937                         if (!dev)
 938                                 return -1;
 939
 940                         *pdev = dev;
 941                 }
 942         }
 943
 944         dump_guest_pages(dev);
 945
 946         return 0;
 947
 948 err_mmap:
 949         free_mem_region(dev);
 950         rte_free(dev->mem);
 951         dev->mem = NULL;
 952         return -1;
 953 }
 954
 955 static bool
 956 vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq)
 957 {
 958         bool rings_ok;
 959
 960         if (!vq)
 961                 return false;
 962
 963         if (vq_is_packed(dev))
 964                 rings_ok = !!vq->desc_packed;
 965         else
 966                 rings_ok = vq->desc && vq->avail && vq->used;
 967
 968         return rings_ok &&
 969                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
 970                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
 971 }
 972
 973 static int
 974 virtio_is_ready(struct virtio_net *dev)
 975 {
 976         struct vhost_virtqueue *vq;
 977         uint32_t i;
 978
 979         if (dev->nr_vring == 0)
 980                 return 0;
 981
 982         for (i = 0; i < dev->nr_vring; i++) {
 983                 vq = dev->virtqueue[i];
 984
 985                 if (!vq_is_ready(dev, vq))
 986                         return 0;
 987         }
 988
 989         RTE_LOG(INFO, VHOST_CONFIG,
 990                 "virtio is now ready for processing.\n");
 991         return 1;
 992 }
 993
 994 static void
 995 vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 996 {
 997         struct vhost_vring_file file;
 998         struct vhost_virtqueue *vq;
 999
1000         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1001         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1002                 file.fd = VIRTIO_INVALID_EVENTFD;
1003         else
1004                 file.fd = pmsg->fds[0];
1005         RTE_LOG(INFO, VHOST_CONFIG,
1006                 "vring call idx:%d file:%d\n", file.index, file.fd);
1007
1008         vq = dev->virtqueue[file.index];
1009         if (vq->callfd >= 0)
1010                 close(vq->callfd);
1011
1012         vq->callfd = file.fd;
1013 }
1014
1015 static void
1016 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *pmsg)
1017 {
1018         struct vhost_vring_file file;
1019         struct vhost_virtqueue *vq;
1020         struct virtio_net *dev = *pdev;
1021
1022         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1023         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1024                 file.fd = VIRTIO_INVALID_EVENTFD;
1025         else
1026                 file.fd = pmsg->fds[0];
1027         RTE_LOG(INFO, VHOST_CONFIG,
1028                 "vring kick idx:%d file:%d\n", file.index, file.fd);
1029
1030         /* Interpret ring addresses only when ring is started. */
1031         dev = translate_ring_addresses(dev, file.index);
1032         if (!dev)
1033                 return;
1034
1035         *pdev = dev;
1036
1037         vq = dev->virtqueue[file.index];
1038
1039         /*
1040          * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
1041          * the ring starts already enabled. Otherwise, it is enabled via
1042          * the SET_VRING_ENABLE message.
1043          */
1044         if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)))
1045                 vq->enabled = 1;
1046
1047         if (vq->kickfd >= 0)
1048                 close(vq->kickfd);
1049         vq->kickfd = file.fd;
1050 }
1051
1052 static void
1053 free_zmbufs(struct vhost_virtqueue *vq)
1054 {
1055         struct zcopy_mbuf *zmbuf, *next;
1056
1057         for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
1058              zmbuf != NULL; zmbuf = next) {
1059                 next = TAILQ_NEXT(zmbuf, next);
1060
1061                 rte_pktmbuf_free(zmbuf->mbuf);
1062                 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
1063         }
1064
1065         rte_free(vq->zmbufs);
1066 }
1067
1068 /*
1069  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
1070  */
1071 static int
1072 vhost_user_get_vring_base(struct virtio_net *dev,
1073                           VhostUserMsg *msg)
1074 {
1075         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
1076
1077         /* We have to stop the queue (virtio) if it is running. */
1078         vhost_destroy_device_notify(dev);
1079
1080         dev->flags &= ~VIRTIO_DEV_READY;
1081         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1082
1083         /* Here we are safe to get the last avail index */
1084         msg->payload.state.num = vq->last_avail_idx;
1085
1086         RTE_LOG(INFO, VHOST_CONFIG,
1087                 "vring base idx:%d file:%d\n", msg->payload.state.index,
1088                 msg->payload.state.num);
1089         /*
1090          * Based on current qemu vhost-user implementation, this message is
1091          * sent and only sent in vhost_vring_stop.
1092          * TODO: cleanup the vring, it isn't usable since here.
1093          */
1094         if (vq->kickfd >= 0)
1095                 close(vq->kickfd);
1096
1097         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
1098
1099         if (vq->callfd >= 0)
1100                 close(vq->callfd);
1101
1102         vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
1103
1104         if (dev->dequeue_zero_copy)
1105                 free_zmbufs(vq);
1106         if (vq_is_packed(dev)) {
1107                 rte_free(vq->shadow_used_packed);
1108                 vq->shadow_used_packed = NULL;
1109         } else {
1110                 rte_free(vq->shadow_used_split);
1111                 vq->shadow_used_split = NULL;
1112         }
1113
1114         rte_free(vq->batch_copy_elems);
1115         vq->batch_copy_elems = NULL;
1116
1117         return 0;
1118 }
1119
1120 /*
1121  * when virtio queues are ready to work, qemu will send us to
1122  * enable the virtio queue pair.
1123  */
1124 static int
1125 vhost_user_set_vring_enable(struct virtio_net *dev,
1126                             VhostUserMsg *msg)
1127 {
1128         int enable = (int)msg->payload.state.num;
1129         int index = (int)msg->payload.state.index;
1130         struct rte_vdpa_device *vdpa_dev;
1131         int did = -1;
1132
1133         RTE_LOG(INFO, VHOST_CONFIG,
1134                 "set queue enable: %d to qp idx: %d\n",
1135                 enable, index);
1136
1137         did = dev->vdpa_dev_id;
1138         vdpa_dev = rte_vdpa_get_device(did);
1139         if (vdpa_dev && vdpa_dev->ops->set_vring_state)
1140                 vdpa_dev->ops->set_vring_state(dev->vid, index, enable);
1141
1142         if (dev->notify_ops->vring_state_changed)
1143                 dev->notify_ops->vring_state_changed(dev->vid,
1144                                 index, enable);
1145
1146         dev->virtqueue[index]->enabled = enable;
1147
1148         return 0;
1149 }
1150
1151 static void
1152 vhost_user_get_protocol_features(struct virtio_net *dev,
1153                                  struct VhostUserMsg *msg)
1154 {
1155         uint64_t features, protocol_features;
1156
1157         rte_vhost_driver_get_features(dev->ifname, &features);
1158         rte_vhost_driver_get_protocol_features(dev->ifname, &protocol_features);
1159
1160         /*
1161          * REPLY_ACK protocol feature is only mandatory for now
1162          * for IOMMU feature. If IOMMU is explicitly disabled by the
1163          * application, disable also REPLY_ACK feature for older buggy
1164          * Qemu versions (from v2.7.0 to v2.9.0).
1165          */
1166         if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
1167                 protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK);
1168
1169         msg->payload.u64 = protocol_features;
1170         msg->size = sizeof(msg->payload.u64);
1171 }
1172
1173 static void
1174 vhost_user_set_protocol_features(struct virtio_net *dev,
1175                                  uint64_t protocol_features)
1176 {
1177         if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES)
1178                 return;
1179
1180         dev->protocol_features = protocol_features;
1181 }
1182
1183 static int
1184 vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg)
1185 {
1186         int fd = msg->fds[0];
1187         uint64_t size, off;
1188         void *addr;
1189
1190         if (fd < 0) {
1191                 RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
1192                 return -1;
1193         }
1194
1195         if (msg->size != sizeof(VhostUserLog)) {
1196                 RTE_LOG(ERR, VHOST_CONFIG,
1197                         "invalid log base msg size: %"PRId32" != %d\n",
1198                         msg->size, (int)sizeof(VhostUserLog));
1199                 return -1;
1200         }
1201
1202         size = msg->payload.log.mmap_size;
1203         off  = msg->payload.log.mmap_offset;
1204
1205         /* Don't allow mmap_offset to point outside the mmap region */
1206         if (off > size) {
1207                 RTE_LOG(ERR, VHOST_CONFIG,
1208                         "log offset %#"PRIx64" exceeds log size %#"PRIx64"\n",
1209                         off, size);
1210                 return -1;
1211         }
1212
1213         RTE_LOG(INFO, VHOST_CONFIG,
1214                 "log mmap size: %"PRId64", offset: %"PRId64"\n",
1215                 size, off);
1216
1217         /*
1218          * mmap from 0 to workaround a hugepage mmap bug: mmap will
1219          * fail when offset is not page size aligned.
1220          */
1221         addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1222         close(fd);
1223         if (addr == MAP_FAILED) {
1224                 RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
1225                 return -1;
1226         }
1227
1228         /*
1229          * Free previously mapped log memory on occasionally
1230          * multiple VHOST_USER_SET_LOG_BASE.
1231          */
1232         if (dev->log_addr) {
1233                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
1234         }
1235         dev->log_addr = (uint64_t)(uintptr_t)addr;
1236         dev->log_base = dev->log_addr + off;
1237         dev->log_size = size;
1238
1239         return 0;
1240 }
1241
1242 /*
1243  * An rarp packet is constructed and broadcasted to notify switches about
1244  * the new location of the migrated VM, so that packets from outside will
1245  * not be lost after migration.
1246  *
1247  * However, we don't actually "send" a rarp packet here, instead, we set
1248  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
1249  */
1250 static int
1251 vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg)
1252 {
1253         uint8_t *mac = (uint8_t *)&msg->payload.u64;
1254         struct rte_vdpa_device *vdpa_dev;
1255         int did = -1;
1256
1257         RTE_LOG(DEBUG, VHOST_CONFIG,
1258                 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
1259                 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
1260         memcpy(dev->mac.addr_bytes, mac, 6);
1261
1262         /*
1263          * Set the flag to inject a RARP broadcast packet at
1264          * rte_vhost_dequeue_burst().
1265          *
1266          * rte_smp_wmb() is for making sure the mac is copied
1267          * before the flag is set.
1268          */
1269         rte_smp_wmb();
1270         rte_atomic16_set(&dev->broadcast_rarp, 1);
1271         did = dev->vdpa_dev_id;
1272         vdpa_dev = rte_vdpa_get_device(did);
1273         if (vdpa_dev && vdpa_dev->ops->migration_done)
1274                 vdpa_dev->ops->migration_done(dev->vid);
1275
1276         return 0;
1277 }
1278
1279 static int
1280 vhost_user_net_set_mtu(struct virtio_net *dev, struct VhostUserMsg *msg)
1281 {
1282         if (msg->payload.u64 < VIRTIO_MIN_MTU ||
1283                         msg->payload.u64 > VIRTIO_MAX_MTU) {
1284                 RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n",
1285                                 msg->payload.u64);
1286
1287                 return -1;
1288         }
1289
1290         dev->mtu = msg->payload.u64;
1291
1292         return 0;
1293 }
1294
1295 static int
1296 vhost_user_set_req_fd(struct virtio_net *dev, struct VhostUserMsg *msg)
1297 {
1298         int fd = msg->fds[0];
1299
1300         if (fd < 0) {
1301                 RTE_LOG(ERR, VHOST_CONFIG,
1302                                 "Invalid file descriptor for slave channel (%d)\n",
1303                                 fd);
1304                 return -1;
1305         }
1306
1307         dev->slave_req_fd = fd;
1308
1309         return 0;
1310 }
1311
1312 static int
1313 is_vring_iotlb_update(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
1314 {
1315         struct vhost_vring_addr *ra;
1316         uint64_t start, end;
1317
1318         start = imsg->iova;
1319         end = start + imsg->size;
1320
1321         ra = &vq->ring_addrs;
1322         if (ra->desc_user_addr >= start && ra->desc_user_addr < end)
1323                 return 1;
1324         if (ra->avail_user_addr >= start && ra->avail_user_addr < end)
1325                 return 1;
1326         if (ra->used_user_addr >= start && ra->used_user_addr < end)
1327                 return 1;
1328
1329         return 0;
1330 }
1331
1332 static int
1333 is_vring_iotlb_invalidate(struct vhost_virtqueue *vq,
1334                                 struct vhost_iotlb_msg *imsg)
1335 {
1336         uint64_t istart, iend, vstart, vend;
1337
1338         istart = imsg->iova;
1339         iend = istart + imsg->size - 1;
1340
1341         vstart = (uintptr_t)vq->desc;
1342         vend = vstart + sizeof(struct vring_desc) * vq->size - 1;
1343         if (vstart <= iend && istart <= vend)
1344                 return 1;
1345
1346         vstart = (uintptr_t)vq->avail;
1347         vend = vstart + sizeof(struct vring_avail);
1348         vend += sizeof(uint16_t) * vq->size - 1;
1349         if (vstart <= iend && istart <= vend)
1350                 return 1;
1351
1352         vstart = (uintptr_t)vq->used;
1353         vend = vstart + sizeof(struct vring_used);
1354         vend += sizeof(struct vring_used_elem) * vq->size - 1;
1355         if (vstart <= iend && istart <= vend)
1356                 return 1;
1357
1358         return 0;
1359 }
1360
1361 static int
1362 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg)
1363 {
1364         struct virtio_net *dev = *pdev;
1365         struct vhost_iotlb_msg *imsg = &msg->payload.iotlb;
1366         uint16_t i;
1367         uint64_t vva, len;
1368
1369         switch (imsg->type) {
1370         case VHOST_IOTLB_UPDATE:
1371                 len = imsg->size;
1372                 vva = qva_to_vva(dev, imsg->uaddr, &len);
1373                 if (!vva)
1374                         return -1;
1375
1376                 for (i = 0; i < dev->nr_vring; i++) {
1377                         struct vhost_virtqueue *vq = dev->virtqueue[i];
1378
1379                         vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
1380                                         len, imsg->perm);
1381
1382                         if (is_vring_iotlb_update(vq, imsg))
1383                                 *pdev = dev = translate_ring_addresses(dev, i);
1384                 }
1385                 break;
1386         case VHOST_IOTLB_INVALIDATE:
1387                 for (i = 0; i < dev->nr_vring; i++) {
1388                         struct vhost_virtqueue *vq = dev->virtqueue[i];
1389
1390                         vhost_user_iotlb_cache_remove(vq, imsg->iova,
1391                                         imsg->size);
1392
1393                         if (is_vring_iotlb_invalidate(vq, imsg))
1394                                 vring_invalidate(dev, vq);
1395                 }
1396                 break;
1397         default:
1398                 RTE_LOG(ERR, VHOST_CONFIG, "Invalid IOTLB message type (%d)\n",
1399                                 imsg->type);
1400                 return -1;
1401         }
1402
1403         return 0;
1404 }
1405
1406 /* return bytes# of read on success or negative val on failure. */
1407 static int
1408 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
1409 {
1410         int ret;
1411
1412         ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
1413                 msg->fds, VHOST_MEMORY_MAX_NREGIONS);
1414         if (ret <= 0)
1415                 return ret;
1416
1417         if (msg && msg->size) {
1418                 if (msg->size > sizeof(msg->payload)) {
1419                         RTE_LOG(ERR, VHOST_CONFIG,
1420                                 "invalid msg size: %d\n", msg->size);
1421                         return -1;
1422                 }
1423                 ret = read(sockfd, &msg->payload, msg->size);
1424                 if (ret <= 0)
1425                         return ret;
1426                 if (ret != (int)msg->size) {
1427                         RTE_LOG(ERR, VHOST_CONFIG,
1428                                 "read control message failed\n");
1429                         return -1;
1430                 }
1431         }
1432
1433         return ret;
1434 }
1435
1436 static int
1437 send_vhost_message(int sockfd, struct VhostUserMsg *msg, int *fds, int fd_num)
1438 {
1439         if (!msg)
1440                 return 0;
1441
1442         return send_fd_message(sockfd, (char *)msg,
1443                 VHOST_USER_HDR_SIZE + msg->size, fds, fd_num);
1444 }
1445
1446 static int
1447 send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
1448 {
1449         if (!msg)
1450                 return 0;
1451
1452         msg->flags &= ~VHOST_USER_VERSION_MASK;
1453         msg->flags &= ~VHOST_USER_NEED_REPLY;
1454         msg->flags |= VHOST_USER_VERSION;
1455         msg->flags |= VHOST_USER_REPLY_MASK;
1456
1457         return send_vhost_message(sockfd, msg, NULL, 0);
1458 }
1459
1460 static int
1461 send_vhost_slave_message(struct virtio_net *dev, struct VhostUserMsg *msg,
1462                          int *fds, int fd_num)
1463 {
1464         int ret;
1465
1466         if (msg->flags & VHOST_USER_NEED_REPLY)
1467                 rte_spinlock_lock(&dev->slave_req_lock);
1468
1469         ret = send_vhost_message(dev->slave_req_fd, msg, fds, fd_num);
1470         if (ret < 0 && (msg->flags & VHOST_USER_NEED_REPLY))
1471                 rte_spinlock_unlock(&dev->slave_req_lock);
1472
1473         return ret;
1474 }
1475
1476 /*
1477  * Allocate a queue pair if it hasn't been allocated yet
1478  */
1479 static int
1480 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, VhostUserMsg *msg)
1481 {
1482         uint16_t vring_idx;
1483
1484         switch (msg->request.master) {
1485         case VHOST_USER_SET_VRING_KICK:
1486         case VHOST_USER_SET_VRING_CALL:
1487         case VHOST_USER_SET_VRING_ERR:
1488                 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1489                 break;
1490         case VHOST_USER_SET_VRING_NUM:
1491         case VHOST_USER_SET_VRING_BASE:
1492         case VHOST_USER_SET_VRING_ENABLE:
1493                 vring_idx = msg->payload.state.index;
1494                 break;
1495         case VHOST_USER_SET_VRING_ADDR:
1496                 vring_idx = msg->payload.addr.index;
1497                 break;
1498         default:
1499                 return 0;
1500         }
1501
1502         if (vring_idx >= VHOST_MAX_VRING) {
1503                 RTE_LOG(ERR, VHOST_CONFIG,
1504                         "invalid vring index: %u\n", vring_idx);
1505                 return -1;
1506         }
1507
1508         if (dev->virtqueue[vring_idx])
1509                 return 0;
1510
1511         return alloc_vring_queue(dev, vring_idx);
1512 }
1513
1514 static void
1515 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
1516 {
1517         unsigned int i = 0;
1518         unsigned int vq_num = 0;
1519
1520         while (vq_num < dev->nr_vring) {
1521                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1522
1523                 if (vq) {
1524                         rte_spinlock_lock(&vq->access_lock);
1525                         vq_num++;
1526                 }
1527                 i++;
1528         }
1529 }
1530
1531 static void
1532 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
1533 {
1534         unsigned int i = 0;
1535         unsigned int vq_num = 0;
1536
1537         while (vq_num < dev->nr_vring) {
1538                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1539
1540                 if (vq) {
1541                         rte_spinlock_unlock(&vq->access_lock);
1542                         vq_num++;
1543                 }
1544                 i++;
1545         }
1546 }
1547
1548 int
1549 vhost_user_msg_handler(int vid, int fd)
1550 {
1551         struct virtio_net *dev;
1552         struct VhostUserMsg msg;
1553         struct rte_vdpa_device *vdpa_dev;
1554         int did = -1;
1555         int ret;
1556         int unlock_required = 0;
1557         uint32_t skip_master = 0;
1558
1559         dev = get_device(vid);
1560         if (dev == NULL)
1561                 return -1;
1562
1563         if (!dev->notify_ops) {
1564                 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
1565                 if (!dev->notify_ops) {
1566                         RTE_LOG(ERR, VHOST_CONFIG,
1567                                 "failed to get callback ops for driver %s\n",
1568                                 dev->ifname);
1569                         return -1;
1570                 }
1571         }
1572
1573         ret = read_vhost_message(fd, &msg);
1574         if (ret <= 0 || msg.request.master >= VHOST_USER_MAX) {
1575                 if (ret < 0)
1576                         RTE_LOG(ERR, VHOST_CONFIG,
1577                                 "vhost read message failed\n");
1578                 else if (ret == 0)
1579                         RTE_LOG(INFO, VHOST_CONFIG,
1580                                 "vhost peer closed\n");
1581                 else
1582                         RTE_LOG(ERR, VHOST_CONFIG,
1583                                 "vhost read incorrect message\n");
1584
1585                 return -1;
1586         }
1587
1588         ret = 0;
1589         if (msg.request.master != VHOST_USER_IOTLB_MSG)
1590                 RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
1591                         vhost_message_str[msg.request.master]);
1592         else
1593                 RTE_LOG(DEBUG, VHOST_CONFIG, "read message %s\n",
1594                         vhost_message_str[msg.request.master]);
1595
1596         ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
1597         if (ret < 0) {
1598                 RTE_LOG(ERR, VHOST_CONFIG,
1599                         "failed to alloc queue\n");
1600                 return -1;
1601         }
1602
1603         /*
1604          * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
1605          * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
1606          * and device is destroyed. destroy_device waits for queues to be
1607          * inactive, so it is safe. Otherwise taking the access_lock
1608          * would cause a dead lock.
1609          */
1610         switch (msg.request.master) {
1611         case VHOST_USER_SET_FEATURES:
1612         case VHOST_USER_SET_PROTOCOL_FEATURES:
1613         case VHOST_USER_SET_OWNER:
1614         case VHOST_USER_SET_MEM_TABLE:
1615         case VHOST_USER_SET_LOG_BASE:
1616         case VHOST_USER_SET_LOG_FD:
1617         case VHOST_USER_SET_VRING_NUM:
1618         case VHOST_USER_SET_VRING_ADDR:
1619         case VHOST_USER_SET_VRING_BASE:
1620         case VHOST_USER_SET_VRING_KICK:
1621         case VHOST_USER_SET_VRING_CALL:
1622         case VHOST_USER_SET_VRING_ERR:
1623         case VHOST_USER_SET_VRING_ENABLE:
1624         case VHOST_USER_SEND_RARP:
1625         case VHOST_USER_NET_SET_MTU:
1626         case VHOST_USER_SET_SLAVE_REQ_FD:
1627                 vhost_user_lock_all_queue_pairs(dev);
1628                 unlock_required = 1;
1629                 break;
1630         default:
1631                 break;
1632
1633         }
1634
1635         if (dev->extern_ops.pre_msg_handle) {
1636                 uint32_t need_reply;
1637
1638                 ret = (*dev->extern_ops.pre_msg_handle)(dev->vid,
1639                                 (void *)&msg, &need_reply, &skip_master);
1640                 if (ret < 0)
1641                         goto skip_to_reply;
1642
1643                 if (need_reply)
1644                         send_vhost_reply(fd, &msg);
1645
1646                 if (skip_master)
1647                         goto skip_to_post_handle;
1648         }
1649
1650         switch (msg.request.master) {
1651         case VHOST_USER_GET_FEATURES:
1652                 msg.payload.u64 = vhost_user_get_features(dev);
1653                 msg.size = sizeof(msg.payload.u64);
1654                 send_vhost_reply(fd, &msg);
1655                 break;
1656         case VHOST_USER_SET_FEATURES:
1657                 ret = vhost_user_set_features(dev, msg.payload.u64);
1658                 if (ret)
1659                         return -1;
1660                 break;
1661
1662         case VHOST_USER_GET_PROTOCOL_FEATURES:
1663                 vhost_user_get_protocol_features(dev, &msg);
1664                 send_vhost_reply(fd, &msg);
1665                 break;
1666         case VHOST_USER_SET_PROTOCOL_FEATURES:
1667                 vhost_user_set_protocol_features(dev, msg.payload.u64);
1668                 break;
1669
1670         case VHOST_USER_SET_OWNER:
1671                 vhost_user_set_owner();
1672                 break;
1673         case VHOST_USER_RESET_OWNER:
1674                 vhost_user_reset_owner(dev);
1675                 break;
1676
1677         case VHOST_USER_SET_MEM_TABLE:
1678                 ret = vhost_user_set_mem_table(&dev, &msg);
1679                 break;
1680
1681         case VHOST_USER_SET_LOG_BASE:
1682                 vhost_user_set_log_base(dev, &msg);
1683
1684                 /* it needs a reply */
1685                 msg.size = sizeof(msg.payload.u64);
1686                 send_vhost_reply(fd, &msg);
1687                 break;
1688         case VHOST_USER_SET_LOG_FD:
1689                 close(msg.fds[0]);
1690                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
1691                 break;
1692
1693         case VHOST_USER_SET_VRING_NUM:
1694                 vhost_user_set_vring_num(dev, &msg);
1695                 break;
1696         case VHOST_USER_SET_VRING_ADDR:
1697                 vhost_user_set_vring_addr(&dev, &msg);
1698                 break;
1699         case VHOST_USER_SET_VRING_BASE:
1700                 vhost_user_set_vring_base(dev, &msg);
1701                 break;
1702
1703         case VHOST_USER_GET_VRING_BASE:
1704                 vhost_user_get_vring_base(dev, &msg);
1705                 msg.size = sizeof(msg.payload.state);
1706                 send_vhost_reply(fd, &msg);
1707                 break;
1708
1709         case VHOST_USER_SET_VRING_KICK:
1710                 vhost_user_set_vring_kick(&dev, &msg);
1711                 break;
1712         case VHOST_USER_SET_VRING_CALL:
1713                 vhost_user_set_vring_call(dev, &msg);
1714                 break;
1715
1716         case VHOST_USER_SET_VRING_ERR:
1717                 if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1718                         close(msg.fds[0]);
1719                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
1720                 break;
1721
1722         case VHOST_USER_GET_QUEUE_NUM:
1723                 msg.payload.u64 = (uint64_t)vhost_user_get_queue_num(dev);
1724                 msg.size = sizeof(msg.payload.u64);
1725                 send_vhost_reply(fd, &msg);
1726                 break;
1727
1728         case VHOST_USER_SET_VRING_ENABLE:
1729                 vhost_user_set_vring_enable(dev, &msg);
1730                 break;
1731         case VHOST_USER_SEND_RARP:
1732                 vhost_user_send_rarp(dev, &msg);
1733                 break;
1734
1735         case VHOST_USER_NET_SET_MTU:
1736                 ret = vhost_user_net_set_mtu(dev, &msg);
1737                 break;
1738
1739         case VHOST_USER_SET_SLAVE_REQ_FD:
1740                 ret = vhost_user_set_req_fd(dev, &msg);
1741                 break;
1742
1743         case VHOST_USER_IOTLB_MSG:
1744                 ret = vhost_user_iotlb_msg(&dev, &msg);
1745                 break;
1746
1747         default:
1748                 ret = -1;
1749                 break;
1750         }
1751
1752 skip_to_post_handle:
1753         if (dev->extern_ops.post_msg_handle) {
1754                 uint32_t need_reply;
1755
1756                 ret = (*dev->extern_ops.post_msg_handle)(
1757                                 dev->vid, (void *)&msg, &need_reply);
1758                 if (ret < 0)
1759                         goto skip_to_reply;
1760
1761                 if (need_reply)
1762                         send_vhost_reply(fd, &msg);
1763         }
1764
1765 skip_to_reply:
1766         if (unlock_required)
1767                 vhost_user_unlock_all_queue_pairs(dev);
1768
1769         if (msg.flags & VHOST_USER_NEED_REPLY) {
1770                 msg.payload.u64 = !!ret;
1771                 msg.size = sizeof(msg.payload.u64);
1772                 send_vhost_reply(fd, &msg);
1773         }
1774
1775         if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) {
1776                 dev->flags |= VIRTIO_DEV_READY;
1777
1778                 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
1779                         if (dev->dequeue_zero_copy) {
1780                                 RTE_LOG(INFO, VHOST_CONFIG,
1781                                                 "dequeue zero copy is enabled\n");
1782                         }
1783
1784                         if (dev->notify_ops->new_device(dev->vid) == 0)
1785                                 dev->flags |= VIRTIO_DEV_RUNNING;
1786                 }
1787         }
1788
1789         did = dev->vdpa_dev_id;
1790         vdpa_dev = rte_vdpa_get_device(did);
1791         if (vdpa_dev && virtio_is_ready(dev) &&
1792                         !(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) &&
1793                         msg.request.master == VHOST_USER_SET_VRING_ENABLE) {
1794                 if (vdpa_dev->ops->dev_conf)
1795                         vdpa_dev->ops->dev_conf(dev->vid);
1796                 dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
1797                 if (vhost_user_host_notifier_ctrl(dev->vid, true) != 0) {
1798                         RTE_LOG(INFO, VHOST_CONFIG,
1799                                 "(%d) software relay is used for vDPA, performance may be low.\n",
1800                                 dev->vid);
1801                 }
1802         }
1803
1804         return 0;
1805 }
1806
1807 static int process_slave_message_reply(struct virtio_net *dev,
1808                                        const VhostUserMsg *msg)
1809 {
1810         VhostUserMsg msg_reply;
1811         int ret;
1812
1813         if ((msg->flags & VHOST_USER_NEED_REPLY) == 0)
1814                 return 0;
1815
1816         if (read_vhost_message(dev->slave_req_fd, &msg_reply) < 0) {
1817                 ret = -1;
1818                 goto out;
1819         }
1820
1821         if (msg_reply.request.slave != msg->request.slave) {
1822                 RTE_LOG(ERR, VHOST_CONFIG,
1823                         "Received unexpected msg type (%u), expected %u\n",
1824                         msg_reply.request.slave, msg->request.slave);
1825                 ret = -1;
1826                 goto out;
1827         }
1828
1829         ret = msg_reply.payload.u64 ? -1 : 0;
1830
1831 out:
1832         rte_spinlock_unlock(&dev->slave_req_lock);
1833         return ret;
1834 }
1835
1836 int
1837 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
1838 {
1839         int ret;
1840         struct VhostUserMsg msg = {
1841                 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
1842                 .flags = VHOST_USER_VERSION,
1843                 .size = sizeof(msg.payload.iotlb),
1844                 .payload.iotlb = {
1845                         .iova = iova,
1846                         .perm = perm,
1847                         .type = VHOST_IOTLB_MISS,
1848                 },
1849         };
1850
1851         ret = send_vhost_message(dev->slave_req_fd, &msg, NULL, 0);
1852         if (ret < 0) {
1853                 RTE_LOG(ERR, VHOST_CONFIG,
1854                                 "Failed to send IOTLB miss message (%d)\n",
1855                                 ret);
1856                 return ret;
1857         }
1858
1859         return 0;
1860 }
1861
1862 static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev,
1863                                                     int index, int fd,
1864                                                     uint64_t offset,
1865                                                     uint64_t size)
1866 {
1867         int *fdp = NULL;
1868         size_t fd_num = 0;
1869         int ret;
1870         struct VhostUserMsg msg = {
1871                 .request.slave = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
1872                 .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY,
1873                 .size = sizeof(msg.payload.area),
1874                 .payload.area = {
1875                         .u64 = index & VHOST_USER_VRING_IDX_MASK,
1876                         .size = size,
1877                         .offset = offset,
1878                 },
1879         };
1880
1881         if (fd < 0)
1882                 msg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK;
1883         else {
1884                 fdp = &fd;
1885                 fd_num = 1;
1886         }
1887
1888         ret = send_vhost_slave_message(dev, &msg, fdp, fd_num);
1889         if (ret < 0) {
1890                 RTE_LOG(ERR, VHOST_CONFIG,
1891                         "Failed to set host notifier (%d)\n", ret);
1892                 return ret;
1893         }
1894
1895         return process_slave_message_reply(dev, &msg);
1896 }
1897
1898 int vhost_user_host_notifier_ctrl(int vid, bool enable)
1899 {
1900         struct virtio_net *dev;
1901         struct rte_vdpa_device *vdpa_dev;
1902         int vfio_device_fd, did, ret = 0;
1903         uint64_t offset, size;
1904         unsigned int i;
1905
1906         dev = get_device(vid);
1907         if (!dev)
1908                 return -ENODEV;
1909
1910         did = dev->vdpa_dev_id;
1911         if (did < 0)
1912                 return -EINVAL;
1913
1914         if (!(dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
1915             !(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) ||
1916             !(dev->protocol_features &
1917                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ)) ||
1918             !(dev->protocol_features &
1919                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) ||
1920             !(dev->protocol_features &
1921                         (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER)))
1922                 return -ENOTSUP;
1923
1924         vdpa_dev = rte_vdpa_get_device(did);
1925         if (!vdpa_dev)
1926                 return -ENODEV;
1927
1928         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP);
1929         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP);
1930
1931         vfio_device_fd = vdpa_dev->ops->get_vfio_device_fd(vid);
1932         if (vfio_device_fd < 0)
1933                 return -ENOTSUP;
1934
1935         if (enable) {
1936                 for (i = 0; i < dev->nr_vring; i++) {
1937                         if (vdpa_dev->ops->get_notify_area(vid, i, &offset,
1938                                         &size) < 0) {
1939                                 ret = -ENOTSUP;
1940                                 goto disable;
1941                         }
1942
1943                         if (vhost_user_slave_set_vring_host_notifier(dev, i,
1944                                         vfio_device_fd, offset, size) < 0) {
1945                                 ret = -EFAULT;
1946                                 goto disable;
1947                         }
1948                 }
1949         } else {
1950 disable:
1951                 for (i = 0; i < dev->nr_vring; i++) {
1952                         vhost_user_slave_set_vring_host_notifier(dev, i, -1,
1953                                         0, 0);
1954                 }
1955         }
1956
1957         return ret;
1958 }