lib/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 <fcntl.h>
  28 #include <sys/ioctl.h>
  29 #include <sys/mman.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/syscall.h>
  33 #include <assert.h>
  34 #ifdef RTE_LIBRTE_VHOST_NUMA
  35 #include <numaif.h>
  36 #endif
  37 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
  38 #include <linux/userfaultfd.h>
  39 #endif
  40 #ifdef F_ADD_SEALS /* if file sealing is supported, so is memfd */
  41 #include <linux/memfd.h>
  42 #define MEMFD_SUPPORTED
  43 #endif
  44
  45 #include <rte_common.h>
  46 #include <rte_malloc.h>
  47 #include <rte_log.h>
  48 #include <rte_vfio.h>
  49 #include <rte_errno.h>
  50
  51 #include "iotlb.h"
  52 #include "vhost.h"
  53 #include "vhost_user.h"
  54
  55 #define VIRTIO_MIN_MTU 68
  56 #define VIRTIO_MAX_MTU 65535
  57
  58 #define INFLIGHT_ALIGNMENT      64
  59 #define INFLIGHT_VERSION        0x1
  60
  61 static const char *vhost_message_str[VHOST_USER_MAX] = {
  62         [VHOST_USER_NONE] = "VHOST_USER_NONE",
  63         [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
  64         [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
  65         [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
  66         [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
  67         [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
  68         [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
  69         [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
  70         [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
  71         [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
  72         [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
  73         [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
  74         [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
  75         [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
  76         [VHOST_USER_SET_VRING_ERR]  = "VHOST_USER_SET_VRING_ERR",
  77         [VHOST_USER_GET_PROTOCOL_FEATURES]  = "VHOST_USER_GET_PROTOCOL_FEATURES",
  78         [VHOST_USER_SET_PROTOCOL_FEATURES]  = "VHOST_USER_SET_PROTOCOL_FEATURES",
  79         [VHOST_USER_GET_QUEUE_NUM]  = "VHOST_USER_GET_QUEUE_NUM",
  80         [VHOST_USER_SET_VRING_ENABLE]  = "VHOST_USER_SET_VRING_ENABLE",
  81         [VHOST_USER_SEND_RARP]  = "VHOST_USER_SEND_RARP",
  82         [VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
  83         [VHOST_USER_SET_SLAVE_REQ_FD]  = "VHOST_USER_SET_SLAVE_REQ_FD",
  84         [VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
  85         [VHOST_USER_CRYPTO_CREATE_SESS] = "VHOST_USER_CRYPTO_CREATE_SESS",
  86         [VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
  87         [VHOST_USER_POSTCOPY_ADVISE]  = "VHOST_USER_POSTCOPY_ADVISE",
  88         [VHOST_USER_POSTCOPY_LISTEN]  = "VHOST_USER_POSTCOPY_LISTEN",
  89         [VHOST_USER_POSTCOPY_END]  = "VHOST_USER_POSTCOPY_END",
  90         [VHOST_USER_GET_INFLIGHT_FD] = "VHOST_USER_GET_INFLIGHT_FD",
  91         [VHOST_USER_SET_INFLIGHT_FD] = "VHOST_USER_SET_INFLIGHT_FD",
  92         [VHOST_USER_SET_STATUS] = "VHOST_USER_SET_STATUS",
  93         [VHOST_USER_GET_STATUS] = "VHOST_USER_GET_STATUS",
  94 };
  95
  96 static int send_vhost_reply(struct virtio_net *dev, int sockfd, struct vhu_msg_context *ctx);
  97 static int read_vhost_message(struct virtio_net *dev, int sockfd, struct vhu_msg_context *ctx);
  98
  99 static void
 100 close_msg_fds(struct vhu_msg_context *ctx)
 101 {
 102         int i;
 103
 104         for (i = 0; i < ctx->fd_num; i++) {
 105                 int fd = ctx->fds[i];
 106
 107                 if (fd == -1)
 108                         continue;
 109
 110                 ctx->fds[i] = -1;
 111                 close(fd);
 112         }
 113 }
 114
 115 /*
 116  * Ensure the expected number of FDs is received,
 117  * close all FDs and return an error if this is not the case.
 118  */
 119 static int
 120 validate_msg_fds(struct virtio_net *dev, struct vhu_msg_context *ctx, int expected_fds)
 121 {
 122         if (ctx->fd_num == expected_fds)
 123                 return 0;
 124
 125         VHOST_LOG_CONFIG(ERR, "(%s) expect %d FDs for request %s, received %d\n",
 126                 dev->ifname, expected_fds,
 127                 vhost_message_str[ctx->msg.request.master],
 128                 ctx->fd_num);
 129
 130         close_msg_fds(ctx);
 131
 132         return -1;
 133 }
 134
 135 static uint64_t
 136 get_blk_size(int fd)
 137 {
 138         struct stat stat;
 139         int ret;
 140
 141         ret = fstat(fd, &stat);
 142         return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
 143 }
 144
 145 static int
 146 async_dma_map(struct virtio_net *dev, struct rte_vhost_mem_region *region, bool do_map)
 147 {
 148         uint64_t host_iova;
 149         int ret = 0;
 150
 151         host_iova = rte_mem_virt2iova((void *)(uintptr_t)region->host_user_addr);
 152         if (do_map) {
 153                 /* Add mapped region into the default container of DPDK. */
 154                 ret = rte_vfio_container_dma_map(RTE_VFIO_DEFAULT_CONTAINER_FD,
 155                                                  region->host_user_addr,
 156                                                  host_iova,
 157                                                  region->size);
 158                 if (ret) {
 159                         /*
 160                          * DMA device may bind with kernel driver, in this case,
 161                          * we don't need to program IOMMU manually. However, if no
 162                          * device is bound with vfio/uio in DPDK, and vfio kernel
 163                          * module is loaded, the API will still be called and return
 164                          * with ENODEV/ENOSUP.
 165                          *
 166                          * DPDK vfio only returns ENODEV/ENOSUP in very similar
 167                          * situations(vfio either unsupported, or supported
 168                          * but no devices found). Either way, no mappings could be
 169                          * performed. We treat it as normal case in async path.
 170                          */
 171                         if (rte_errno == ENODEV || rte_errno == ENOTSUP)
 172                                 return 0;
 173
 174                         VHOST_LOG_CONFIG(ERR, "(%s) DMA engine map failed\n", dev->ifname);
 175                         /* DMA mapping errors won't stop VHST_USER_SET_MEM_TABLE. */
 176                         return 0;
 177                 }
 178
 179         } else {
 180                 /* Remove mapped region from the default container of DPDK. */
 181                 ret = rte_vfio_container_dma_unmap(RTE_VFIO_DEFAULT_CONTAINER_FD,
 182                                                    region->host_user_addr,
 183                                                    host_iova,
 184                                                    region->size);
 185                 if (ret) {
 186                         /* like DMA map, ignore the kernel driver case when unmap. */
 187                         if (rte_errno == EINVAL)
 188                                 return 0;
 189
 190                         VHOST_LOG_CONFIG(ERR, "(%s) DMA engine unmap failed\n", dev->ifname);
 191                         return ret;
 192                 }
 193         }
 194
 195         return ret;
 196 }
 197
 198 static void
 199 free_mem_region(struct virtio_net *dev)
 200 {
 201         uint32_t i;
 202         struct rte_vhost_mem_region *reg;
 203
 204         if (!dev || !dev->mem)
 205                 return;
 206
 207         for (i = 0; i < dev->mem->nregions; i++) {
 208                 reg = &dev->mem->regions[i];
 209                 if (reg->host_user_addr) {
 210                         if (dev->async_copy && rte_vfio_is_enabled("vfio"))
 211                                 async_dma_map(dev, reg, false);
 212
 213                         munmap(reg->mmap_addr, reg->mmap_size);
 214                         close(reg->fd);
 215                 }
 216         }
 217 }
 218
 219 void
 220 vhost_backend_cleanup(struct virtio_net *dev)
 221 {
 222         if (dev->mem) {
 223                 free_mem_region(dev);
 224                 rte_free(dev->mem);
 225                 dev->mem = NULL;
 226         }
 227
 228         rte_free(dev->guest_pages);
 229         dev->guest_pages = NULL;
 230
 231         if (dev->log_addr) {
 232                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 233                 dev->log_addr = 0;
 234         }
 235
 236         if (dev->inflight_info) {
 237                 if (dev->inflight_info->addr) {
 238                         munmap(dev->inflight_info->addr,
 239                                dev->inflight_info->size);
 240                         dev->inflight_info->addr = NULL;
 241                 }
 242
 243                 if (dev->inflight_info->fd >= 0) {
 244                         close(dev->inflight_info->fd);
 245                         dev->inflight_info->fd = -1;
 246                 }
 247
 248                 rte_free(dev->inflight_info);
 249                 dev->inflight_info = NULL;
 250         }
 251
 252         if (dev->slave_req_fd >= 0) {
 253                 close(dev->slave_req_fd);
 254                 dev->slave_req_fd = -1;
 255         }
 256
 257         if (dev->postcopy_ufd >= 0) {
 258                 close(dev->postcopy_ufd);
 259                 dev->postcopy_ufd = -1;
 260         }
 261
 262         dev->postcopy_listening = 0;
 263 }
 264
 265 static void
 266 vhost_user_notify_queue_state(struct virtio_net *dev, uint16_t index,
 267                               int enable)
 268 {
 269         struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
 270         struct vhost_virtqueue *vq = dev->virtqueue[index];
 271
 272         /* Configure guest notifications on enable */
 273         if (enable && vq->notif_enable != VIRTIO_UNINITIALIZED_NOTIF)
 274                 vhost_enable_guest_notification(dev, vq, vq->notif_enable);
 275
 276         if (vdpa_dev && vdpa_dev->ops->set_vring_state)
 277                 vdpa_dev->ops->set_vring_state(dev->vid, index, enable);
 278
 279         if (dev->notify_ops->vring_state_changed)
 280                 dev->notify_ops->vring_state_changed(dev->vid,
 281                                 index, enable);
 282 }
 283
 284 /*
 285  * This function just returns success at the moment unless
 286  * the device hasn't been initialised.
 287  */
 288 static int
 289 vhost_user_set_owner(struct virtio_net **pdev,
 290                         struct vhu_msg_context *ctx,
 291                         int main_fd __rte_unused)
 292 {
 293         struct virtio_net *dev = *pdev;
 294
 295         if (validate_msg_fds(dev, ctx, 0) != 0)
 296                 return RTE_VHOST_MSG_RESULT_ERR;
 297
 298         return RTE_VHOST_MSG_RESULT_OK;
 299 }
 300
 301 static int
 302 vhost_user_reset_owner(struct virtio_net **pdev,
 303                         struct vhu_msg_context *ctx,
 304                         int main_fd __rte_unused)
 305 {
 306         struct virtio_net *dev = *pdev;
 307
 308         if (validate_msg_fds(dev, ctx, 0) != 0)
 309                 return RTE_VHOST_MSG_RESULT_ERR;
 310
 311         vhost_destroy_device_notify(dev);
 312
 313         cleanup_device(dev, 0);
 314         reset_device(dev);
 315         return RTE_VHOST_MSG_RESULT_OK;
 316 }
 317
 318 /*
 319  * The features that we support are requested.
 320  */
 321 static int
 322 vhost_user_get_features(struct virtio_net **pdev,
 323                         struct vhu_msg_context *ctx,
 324                         int main_fd __rte_unused)
 325 {
 326         struct virtio_net *dev = *pdev;
 327         uint64_t features = 0;
 328
 329         if (validate_msg_fds(dev, ctx, 0) != 0)
 330                 return RTE_VHOST_MSG_RESULT_ERR;
 331
 332         rte_vhost_driver_get_features(dev->ifname, &features);
 333
 334         ctx->msg.payload.u64 = features;
 335         ctx->msg.size = sizeof(ctx->msg.payload.u64);
 336         ctx->fd_num = 0;
 337
 338         return RTE_VHOST_MSG_RESULT_REPLY;
 339 }
 340
 341 /*
 342  * The queue number that we support are requested.
 343  */
 344 static int
 345 vhost_user_get_queue_num(struct virtio_net **pdev,
 346                         struct vhu_msg_context *ctx,
 347                         int main_fd __rte_unused)
 348 {
 349         struct virtio_net *dev = *pdev;
 350         uint32_t queue_num = 0;
 351
 352         if (validate_msg_fds(dev, ctx, 0) != 0)
 353                 return RTE_VHOST_MSG_RESULT_ERR;
 354
 355         rte_vhost_driver_get_queue_num(dev->ifname, &queue_num);
 356
 357         ctx->msg.payload.u64 = (uint64_t)queue_num;
 358         ctx->msg.size = sizeof(ctx->msg.payload.u64);
 359         ctx->fd_num = 0;
 360
 361         return RTE_VHOST_MSG_RESULT_REPLY;
 362 }
 363
 364 /*
 365  * We receive the negotiated features supported by us and the virtio device.
 366  */
 367 static int
 368 vhost_user_set_features(struct virtio_net **pdev,
 369                         struct vhu_msg_context *ctx,
 370                         int main_fd __rte_unused)
 371 {
 372         struct virtio_net *dev = *pdev;
 373         uint64_t features = ctx->msg.payload.u64;
 374         uint64_t vhost_features = 0;
 375         struct rte_vdpa_device *vdpa_dev;
 376
 377         if (validate_msg_fds(dev, ctx, 0) != 0)
 378                 return RTE_VHOST_MSG_RESULT_ERR;
 379
 380         rte_vhost_driver_get_features(dev->ifname, &vhost_features);
 381         if (features & ~vhost_features) {
 382                 VHOST_LOG_CONFIG(ERR, "(%s) received invalid negotiated features.\n",
 383                         dev->ifname);
 384                 dev->flags |= VIRTIO_DEV_FEATURES_FAILED;
 385                 dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK;
 386
 387                 return RTE_VHOST_MSG_RESULT_ERR;
 388         }
 389
 390         if (dev->flags & VIRTIO_DEV_RUNNING) {
 391                 if (dev->features == features)
 392                         return RTE_VHOST_MSG_RESULT_OK;
 393
 394                 /*
 395                  * Error out if master tries to change features while device is
 396                  * in running state. The exception being VHOST_F_LOG_ALL, which
 397                  * is enabled when the live-migration starts.
 398                  */
 399                 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) {
 400                         VHOST_LOG_CONFIG(ERR, "(%s) features changed while device is running.\n",
 401                                 dev->ifname);
 402                         return RTE_VHOST_MSG_RESULT_ERR;
 403                 }
 404
 405                 if (dev->notify_ops->features_changed)
 406                         dev->notify_ops->features_changed(dev->vid, features);
 407         }
 408
 409         dev->features = features;
 410         if (dev->features &
 411                 ((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
 412                  (1ULL << VIRTIO_F_VERSION_1) |
 413                  (1ULL << VIRTIO_F_RING_PACKED))) {
 414                 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 415         } else {
 416                 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
 417         }
 418         VHOST_LOG_CONFIG(INFO, "(%s) negotiated Virtio features: 0x%" PRIx64 "\n",
 419                         dev->ifname, dev->features);
 420         VHOST_LOG_CONFIG(DEBUG, "(%s) mergeable RX buffers %s, virtio 1 %s\n",
 421                 dev->ifname,
 422                 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
 423                 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 424
 425         if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
 426             !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
 427                 /*
 428                  * Remove all but first queue pair if MQ hasn't been
 429                  * negotiated. This is safe because the device is not
 430                  * running at this stage.
 431                  */
 432                 while (dev->nr_vring > 2) {
 433                         struct vhost_virtqueue *vq;
 434
 435                         vq = dev->virtqueue[--dev->nr_vring];
 436                         if (!vq)
 437                                 continue;
 438
 439                         dev->virtqueue[dev->nr_vring] = NULL;
 440                         cleanup_vq(vq, 1);
 441                         cleanup_vq_inflight(dev, vq);
 442                         free_vq(dev, vq);
 443                 }
 444         }
 445
 446         vdpa_dev = dev->vdpa_dev;
 447         if (vdpa_dev)
 448                 vdpa_dev->ops->set_features(dev->vid);
 449
 450         dev->flags &= ~VIRTIO_DEV_FEATURES_FAILED;
 451         return RTE_VHOST_MSG_RESULT_OK;
 452 }
 453
 454 /*
 455  * The virtio device sends us the size of the descriptor ring.
 456  */
 457 static int
 458 vhost_user_set_vring_num(struct virtio_net **pdev,
 459                         struct vhu_msg_context *ctx,
 460                         int main_fd __rte_unused)
 461 {
 462         struct virtio_net *dev = *pdev;
 463         struct vhost_virtqueue *vq = dev->virtqueue[ctx->msg.payload.state.index];
 464
 465         if (validate_msg_fds(dev, ctx, 0) != 0)
 466                 return RTE_VHOST_MSG_RESULT_ERR;
 467
 468         if (ctx->msg.payload.state.num > 32768) {
 469                 VHOST_LOG_CONFIG(ERR, "(%s) invalid virtqueue size %u\n",
 470                                 dev->ifname, ctx->msg.payload.state.num);
 471                 return RTE_VHOST_MSG_RESULT_ERR;
 472         }
 473
 474         vq->size = ctx->msg.payload.state.num;
 475
 476         /* VIRTIO 1.0, 2.4 Virtqueues says:
 477          *
 478          *   Queue Size value is always a power of 2. The maximum Queue Size
 479          *   value is 32768.
 480          *
 481          * VIRTIO 1.1 2.7 Virtqueues says:
 482          *
 483          *   Packed virtqueues support up to 2^15 entries each.
 484          */
 485         if (!vq_is_packed(dev)) {
 486                 if (vq->size & (vq->size - 1)) {
 487                         VHOST_LOG_CONFIG(ERR, "(%s) invalid virtqueue size %u\n",
 488                                         dev->ifname, vq->size);
 489                         return RTE_VHOST_MSG_RESULT_ERR;
 490                 }
 491         }
 492
 493         if (vq_is_packed(dev)) {
 494                 if (vq->shadow_used_packed)
 495                         rte_free(vq->shadow_used_packed);
 496                 vq->shadow_used_packed = rte_malloc_socket(NULL,
 497                                 vq->size *
 498                                 sizeof(struct vring_used_elem_packed),
 499                                 RTE_CACHE_LINE_SIZE, vq->numa_node);
 500                 if (!vq->shadow_used_packed) {
 501                         VHOST_LOG_CONFIG(ERR,
 502                                 "(%s) failed to allocate memory for shadow used ring.\n",
 503                                 dev->ifname);
 504                         return RTE_VHOST_MSG_RESULT_ERR;
 505                 }
 506
 507         } else {
 508                 if (vq->shadow_used_split)
 509                         rte_free(vq->shadow_used_split);
 510
 511                 vq->shadow_used_split = rte_malloc_socket(NULL,
 512                                 vq->size * sizeof(struct vring_used_elem),
 513                                 RTE_CACHE_LINE_SIZE, vq->numa_node);
 514
 515                 if (!vq->shadow_used_split) {
 516                         VHOST_LOG_CONFIG(ERR,
 517                                 "(%s) failed to allocate memory for vq internal data.\n",
 518                                 dev->ifname);
 519                         return RTE_VHOST_MSG_RESULT_ERR;
 520                 }
 521         }
 522
 523         if (vq->batch_copy_elems)
 524                 rte_free(vq->batch_copy_elems);
 525         vq->batch_copy_elems = rte_malloc_socket(NULL,
 526                                 vq->size * sizeof(struct batch_copy_elem),
 527                                 RTE_CACHE_LINE_SIZE, vq->numa_node);
 528         if (!vq->batch_copy_elems) {
 529                 VHOST_LOG_CONFIG(ERR, "(%s) failed to allocate memory for batching copy.\n",
 530                         dev->ifname);
 531                 return RTE_VHOST_MSG_RESULT_ERR;
 532         }
 533
 534         return RTE_VHOST_MSG_RESULT_OK;
 535 }
 536
 537 /*
 538  * Reallocate virtio_dev, vhost_virtqueue and related data structures to
 539  * make them on the same numa node as the memory of vring descriptor.
 540  */
 541 #ifdef RTE_LIBRTE_VHOST_NUMA
 542 static struct virtio_net*
 543 numa_realloc(struct virtio_net *dev, int index)
 544 {
 545         int node, dev_node;
 546         struct virtio_net *old_dev;
 547         struct vhost_virtqueue *vq;
 548         struct batch_copy_elem *bce;
 549         struct guest_page *gp;
 550         struct rte_vhost_memory *mem;
 551         size_t mem_size;
 552         int ret;
 553
 554         old_dev = dev;
 555         vq = dev->virtqueue[index];
 556
 557         /*
 558          * If VQ is ready, it is too late to reallocate, it certainly already
 559          * happened anyway on VHOST_USER_SET_VRING_ADRR.
 560          */
 561         if (vq->ready)
 562                 return dev;
 563
 564         ret = get_mempolicy(&node, NULL, 0, vq->desc, MPOL_F_NODE | MPOL_F_ADDR);
 565         if (ret) {
 566                 VHOST_LOG_CONFIG(ERR, "(%s) unable to get virtqueue %d numa information.\n",
 567                                 dev->ifname, index);
 568                 return dev;
 569         }
 570
 571         if (node == vq->numa_node)
 572                 goto out_dev_realloc;
 573
 574         vq = rte_realloc_socket(vq, sizeof(*vq), 0, node);
 575         if (!vq) {
 576                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc virtqueue %d on node %d\n",
 577                                 dev->ifname, index, node);
 578                 return dev;
 579         }
 580
 581         if (vq != dev->virtqueue[index]) {
 582                 VHOST_LOG_CONFIG(INFO, "(%s) reallocated virtqueue on node %d\n",
 583                                 dev->ifname, node);
 584                 dev->virtqueue[index] = vq;
 585                 vhost_user_iotlb_init(dev, index);
 586         }
 587
 588         if (vq_is_packed(dev)) {
 589                 struct vring_used_elem_packed *sup;
 590
 591                 sup = rte_realloc_socket(vq->shadow_used_packed, vq->size * sizeof(*sup),
 592                                 RTE_CACHE_LINE_SIZE, node);
 593                 if (!sup) {
 594                         VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc shadow packed on node %d\n",
 595                                         dev->ifname, node);
 596                         return dev;
 597                 }
 598                 vq->shadow_used_packed = sup;
 599         } else {
 600                 struct vring_used_elem *sus;
 601
 602                 sus = rte_realloc_socket(vq->shadow_used_split, vq->size * sizeof(*sus),
 603                                 RTE_CACHE_LINE_SIZE, node);
 604                 if (!sus) {
 605                         VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc shadow split on node %d\n",
 606                                         dev->ifname, node);
 607                         return dev;
 608                 }
 609                 vq->shadow_used_split = sus;
 610         }
 611
 612         bce = rte_realloc_socket(vq->batch_copy_elems, vq->size * sizeof(*bce),
 613                         RTE_CACHE_LINE_SIZE, node);
 614         if (!bce) {
 615                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc batch copy elem on node %d\n",
 616                                 dev->ifname, node);
 617                 return dev;
 618         }
 619         vq->batch_copy_elems = bce;
 620
 621         if (vq->log_cache) {
 622                 struct log_cache_entry *lc;
 623
 624                 lc = rte_realloc_socket(vq->log_cache, sizeof(*lc) * VHOST_LOG_CACHE_NR, 0, node);
 625                 if (!lc) {
 626                         VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc log cache on node %d\n",
 627                                         dev->ifname, node);
 628                         return dev;
 629                 }
 630                 vq->log_cache = lc;
 631         }
 632
 633         if (vq->resubmit_inflight) {
 634                 struct rte_vhost_resubmit_info *ri;
 635
 636                 ri = rte_realloc_socket(vq->resubmit_inflight, sizeof(*ri), 0, node);
 637                 if (!ri) {
 638                         VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc resubmit inflight on node %d\n",
 639                                         dev->ifname, node);
 640                         return dev;
 641                 }
 642                 vq->resubmit_inflight = ri;
 643
 644                 if (ri->resubmit_list) {
 645                         struct rte_vhost_resubmit_desc *rd;
 646
 647                         rd = rte_realloc_socket(ri->resubmit_list, sizeof(*rd) * ri->resubmit_num,
 648                                         0, node);
 649                         if (!rd) {
 650                                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc resubmit list on node %d\n",
 651                                                 dev->ifname, node);
 652                                 return dev;
 653                         }
 654                         ri->resubmit_list = rd;
 655                 }
 656         }
 657
 658         vq->numa_node = node;
 659
 660 out_dev_realloc:
 661
 662         if (dev->flags & VIRTIO_DEV_RUNNING)
 663                 return dev;
 664
 665         ret = get_mempolicy(&dev_node, NULL, 0, dev, MPOL_F_NODE | MPOL_F_ADDR);
 666         if (ret) {
 667                 VHOST_LOG_CONFIG(ERR, "(%s) unable to get numa information.\n", dev->ifname);
 668                 return dev;
 669         }
 670
 671         if (dev_node == node)
 672                 return dev;
 673
 674         dev = rte_realloc_socket(old_dev, sizeof(*dev), 0, node);
 675         if (!dev) {
 676                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc dev on node %d\n",
 677                                 dev->ifname, node);
 678                 return old_dev;
 679         }
 680
 681         VHOST_LOG_CONFIG(INFO, "(%s) reallocated device on node %d\n", dev->ifname, node);
 682         vhost_devices[dev->vid] = dev;
 683
 684         mem_size = sizeof(struct rte_vhost_memory) +
 685                 sizeof(struct rte_vhost_mem_region) * dev->mem->nregions;
 686         mem = rte_realloc_socket(dev->mem, mem_size, 0, node);
 687         if (!mem) {
 688                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc mem table on node %d\n",
 689                                 dev->ifname, node);
 690                 return dev;
 691         }
 692         dev->mem = mem;
 693
 694         gp = rte_realloc_socket(dev->guest_pages, dev->max_guest_pages * sizeof(*gp),
 695                         RTE_CACHE_LINE_SIZE, node);
 696         if (!gp) {
 697                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc guest pages on node %d\n",
 698                                 dev->ifname, node);
 699                 return dev;
 700         }
 701         dev->guest_pages = gp;
 702
 703         return dev;
 704 }
 705 #else
 706 static struct virtio_net*
 707 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 708 {
 709         return dev;
 710 }
 711 #endif
 712
 713 /* Converts QEMU virtual address to Vhost virtual address. */
 714 static uint64_t
 715 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
 716 {
 717         struct rte_vhost_mem_region *r;
 718         uint32_t i;
 719
 720         if (unlikely(!dev || !dev->mem))
 721                 goto out_error;
 722
 723         /* Find the region where the address lives. */
 724         for (i = 0; i < dev->mem->nregions; i++) {
 725                 r = &dev->mem->regions[i];
 726
 727                 if (qva >= r->guest_user_addr &&
 728                     qva <  r->guest_user_addr + r->size) {
 729
 730                         if (unlikely(*len > r->guest_user_addr + r->size - qva))
 731                                 *len = r->guest_user_addr + r->size - qva;
 732
 733                         return qva - r->guest_user_addr +
 734                                r->host_user_addr;
 735                 }
 736         }
 737 out_error:
 738         *len = 0;
 739
 740         return 0;
 741 }
 742
 743
 744 /*
 745  * Converts ring address to Vhost virtual address.
 746  * If IOMMU is enabled, the ring address is a guest IO virtual address,
 747  * else it is a QEMU virtual address.
 748  */
 749 static uint64_t
 750 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 751                 uint64_t ra, uint64_t *size)
 752 {
 753         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 754                 uint64_t vva;
 755
 756                 vhost_user_iotlb_rd_lock(vq);
 757                 vva = vhost_iova_to_vva(dev, vq, ra,
 758                                         size, VHOST_ACCESS_RW);
 759                 vhost_user_iotlb_rd_unlock(vq);
 760
 761                 return vva;
 762         }
 763
 764         return qva_to_vva(dev, ra, size);
 765 }
 766
 767 static uint64_t
 768 log_addr_to_gpa(struct virtio_net *dev, struct vhost_virtqueue *vq)
 769 {
 770         uint64_t log_gpa;
 771
 772         vhost_user_iotlb_rd_lock(vq);
 773         log_gpa = translate_log_addr(dev, vq, vq->ring_addrs.log_guest_addr);
 774         vhost_user_iotlb_rd_unlock(vq);
 775
 776         return log_gpa;
 777 }
 778
 779 static struct virtio_net *
 780 translate_ring_addresses(struct virtio_net *dev, int vq_index)
 781 {
 782         struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 783         struct vhost_vring_addr *addr = &vq->ring_addrs;
 784         uint64_t len, expected_len;
 785
 786         if (addr->flags & (1 << VHOST_VRING_F_LOG)) {
 787                 vq->log_guest_addr =
 788                         log_addr_to_gpa(dev, vq);
 789                 if (vq->log_guest_addr == 0) {
 790                         VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map log_guest_addr.\n",
 791                                 dev->ifname);
 792                         return dev;
 793                 }
 794         }
 795
 796         if (vq_is_packed(dev)) {
 797                 len = sizeof(struct vring_packed_desc) * vq->size;
 798                 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 799                         ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len);
 800                 if (vq->desc_packed == NULL ||
 801                                 len != sizeof(struct vring_packed_desc) *
 802                                 vq->size) {
 803                         VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map desc_packed ring.\n",
 804                                 dev->ifname);
 805                         return dev;
 806                 }
 807
 808                 dev = numa_realloc(dev, vq_index);
 809                 vq = dev->virtqueue[vq_index];
 810                 addr = &vq->ring_addrs;
 811
 812                 len = sizeof(struct vring_packed_desc_event);
 813                 vq->driver_event = (struct vring_packed_desc_event *)
 814                                         (uintptr_t)ring_addr_to_vva(dev,
 815                                         vq, addr->avail_user_addr, &len);
 816                 if (vq->driver_event == NULL ||
 817                                 len != sizeof(struct vring_packed_desc_event)) {
 818                         VHOST_LOG_CONFIG(DEBUG, "(%s) failed to find driver area address.\n",
 819                                 dev->ifname);
 820                         return dev;
 821                 }
 822
 823                 len = sizeof(struct vring_packed_desc_event);
 824                 vq->device_event = (struct vring_packed_desc_event *)
 825                                         (uintptr_t)ring_addr_to_vva(dev,
 826                                         vq, addr->used_user_addr, &len);
 827                 if (vq->device_event == NULL ||
 828                                 len != sizeof(struct vring_packed_desc_event)) {
 829                         VHOST_LOG_CONFIG(DEBUG, "(%s) failed to find device area address.\n",
 830                                 dev->ifname);
 831                         return dev;
 832                 }
 833
 834                 vq->access_ok = true;
 835                 return dev;
 836         }
 837
 838         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 839         if (vq->desc && vq->avail && vq->used)
 840                 return dev;
 841
 842         len = sizeof(struct vring_desc) * vq->size;
 843         vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
 844                         vq, addr->desc_user_addr, &len);
 845         if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
 846                 VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map desc ring.\n", dev->ifname);
 847                 return dev;
 848         }
 849
 850         dev = numa_realloc(dev, vq_index);
 851         vq = dev->virtqueue[vq_index];
 852         addr = &vq->ring_addrs;
 853
 854         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
 855         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 856                 len += sizeof(uint16_t);
 857         expected_len = len;
 858         vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
 859                         vq, addr->avail_user_addr, &len);
 860         if (vq->avail == 0 || len != expected_len) {
 861                 VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map avail ring.\n", dev->ifname);
 862                 return dev;
 863         }
 864
 865         len = sizeof(struct vring_used) +
 866                 sizeof(struct vring_used_elem) * vq->size;
 867         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 868                 len += sizeof(uint16_t);
 869         expected_len = len;
 870         vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
 871                         vq, addr->used_user_addr, &len);
 872         if (vq->used == 0 || len != expected_len) {
 873                 VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map used ring.\n", dev->ifname);
 874                 return dev;
 875         }
 876
 877         if (vq->last_used_idx != vq->used->idx) {
 878                 VHOST_LOG_CONFIG(WARNING, "(%s) last_used_idx (%u) and vq->used->idx (%u) mismatches;\n",
 879                         dev->ifname,
 880                         vq->last_used_idx, vq->used->idx);
 881                 vq->last_used_idx  = vq->used->idx;
 882                 vq->last_avail_idx = vq->used->idx;
 883                 VHOST_LOG_CONFIG(WARNING, "(%s) some packets maybe resent for Tx and dropped for Rx\n",
 884                         dev->ifname);
 885         }
 886
 887         vq->access_ok = true;
 888
 889         VHOST_LOG_CONFIG(DEBUG, "(%s) mapped address desc: %p\n", dev->ifname, vq->desc);
 890         VHOST_LOG_CONFIG(DEBUG, "(%s) mapped address avail: %p\n", dev->ifname, vq->avail);
 891         VHOST_LOG_CONFIG(DEBUG, "(%s) mapped address used: %p\n", dev->ifname, vq->used);
 892         VHOST_LOG_CONFIG(DEBUG, "(%s) log_guest_addr: %" PRIx64 "\n",
 893                         dev->ifname, vq->log_guest_addr);
 894
 895         return dev;
 896 }
 897
 898 /*
 899  * The virtio device sends us the desc, used and avail ring addresses.
 900  * This function then converts these to our address space.
 901  */
 902 static int
 903 vhost_user_set_vring_addr(struct virtio_net **pdev,
 904                         struct vhu_msg_context *ctx,
 905                         int main_fd __rte_unused)
 906 {
 907         struct virtio_net *dev = *pdev;
 908         struct vhost_virtqueue *vq;
 909         struct vhost_vring_addr *addr = &ctx->msg.payload.addr;
 910         bool access_ok;
 911
 912         if (validate_msg_fds(dev, ctx, 0) != 0)
 913                 return RTE_VHOST_MSG_RESULT_ERR;
 914
 915         if (dev->mem == NULL)
 916                 return RTE_VHOST_MSG_RESULT_ERR;
 917
 918         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 919         vq = dev->virtqueue[ctx->msg.payload.addr.index];
 920
 921         access_ok = vq->access_ok;
 922
 923         /*
 924          * Rings addresses should not be interpreted as long as the ring is not
 925          * started and enabled
 926          */
 927         memcpy(&vq->ring_addrs, addr, sizeof(*addr));
 928
 929         vring_invalidate(dev, vq);
 930
 931         if ((vq->enabled && (dev->features &
 932                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) ||
 933                         access_ok) {
 934                 dev = translate_ring_addresses(dev, ctx->msg.payload.addr.index);
 935                 if (!dev)
 936                         return RTE_VHOST_MSG_RESULT_ERR;
 937
 938                 *pdev = dev;
 939         }
 940
 941         return RTE_VHOST_MSG_RESULT_OK;
 942 }
 943
 944 /*
 945  * The virtio device sends us the available ring last used index.
 946  */
 947 static int
 948 vhost_user_set_vring_base(struct virtio_net **pdev,
 949                         struct vhu_msg_context *ctx,
 950                         int main_fd __rte_unused)
 951 {
 952         struct virtio_net *dev = *pdev;
 953         struct vhost_virtqueue *vq = dev->virtqueue[ctx->msg.payload.state.index];
 954         uint64_t val = ctx->msg.payload.state.num;
 955
 956         if (validate_msg_fds(dev, ctx, 0) != 0)
 957                 return RTE_VHOST_MSG_RESULT_ERR;
 958
 959         if (vq_is_packed(dev)) {
 960                 /*
 961                  * Bit[0:14]: avail index
 962                  * Bit[15]: avail wrap counter
 963                  */
 964                 vq->last_avail_idx = val & 0x7fff;
 965                 vq->avail_wrap_counter = !!(val & (0x1 << 15));
 966                 /*
 967                  * Set used index to same value as available one, as
 968                  * their values should be the same since ring processing
 969                  * was stopped at get time.
 970                  */
 971                 vq->last_used_idx = vq->last_avail_idx;
 972                 vq->used_wrap_counter = vq->avail_wrap_counter;
 973         } else {
 974                 vq->last_used_idx = ctx->msg.payload.state.num;
 975                 vq->last_avail_idx = ctx->msg.payload.state.num;
 976         }
 977
 978         VHOST_LOG_CONFIG(INFO,
 979                 "(%s) vring base idx:%u last_used_idx:%u last_avail_idx:%u.\n",
 980                 dev->ifname, ctx->msg.payload.state.index, vq->last_used_idx,
 981                 vq->last_avail_idx);
 982
 983         return RTE_VHOST_MSG_RESULT_OK;
 984 }
 985
 986 static int
 987 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 988                    uint64_t host_phys_addr, uint64_t size)
 989 {
 990         struct guest_page *page, *last_page;
 991         struct guest_page *old_pages;
 992
 993         if (dev->nr_guest_pages == dev->max_guest_pages) {
 994                 dev->max_guest_pages *= 2;
 995                 old_pages = dev->guest_pages;
 996                 dev->guest_pages = rte_realloc(dev->guest_pages,
 997                                         dev->max_guest_pages * sizeof(*page),
 998                                         RTE_CACHE_LINE_SIZE);
 999                 if (dev->guest_pages == NULL) {
1000                         VHOST_LOG_CONFIG(ERR, "(%s) cannot realloc guest_pages\n", dev->ifname);
1001                         rte_free(old_pages);
1002                         return -1;
1003                 }
1004         }
1005
1006         if (dev->nr_guest_pages > 0) {
1007                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
1008                 /* merge if the two pages are continuous */
1009                 if (host_phys_addr == last_page->host_phys_addr +
1010                                       last_page->size) {
1011                         last_page->size += size;
1012                         return 0;
1013                 }
1014         }
1015
1016         page = &dev->guest_pages[dev->nr_guest_pages++];
1017         page->guest_phys_addr = guest_phys_addr;
1018         page->host_phys_addr  = host_phys_addr;
1019         page->size = size;
1020
1021         return 0;
1022 }
1023
1024 static int
1025 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
1026                 uint64_t page_size)
1027 {
1028         uint64_t reg_size = reg->size;
1029         uint64_t host_user_addr  = reg->host_user_addr;
1030         uint64_t guest_phys_addr = reg->guest_phys_addr;
1031         uint64_t host_phys_addr;
1032         uint64_t size;
1033
1034         host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
1035         size = page_size - (guest_phys_addr & (page_size - 1));
1036         size = RTE_MIN(size, reg_size);
1037
1038         if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size) < 0)
1039                 return -1;
1040
1041         host_user_addr  += size;
1042         guest_phys_addr += size;
1043         reg_size -= size;
1044
1045         while (reg_size > 0) {
1046                 size = RTE_MIN(reg_size, page_size);
1047                 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
1048                                                   host_user_addr);
1049                 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
1050                                 size) < 0)
1051                         return -1;
1052
1053                 host_user_addr  += size;
1054                 guest_phys_addr += size;
1055                 reg_size -= size;
1056         }
1057
1058         /* sort guest page array if over binary search threshold */
1059         if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
1060                 qsort((void *)dev->guest_pages, dev->nr_guest_pages,
1061                         sizeof(struct guest_page), guest_page_addrcmp);
1062         }
1063
1064         return 0;
1065 }
1066
1067 #ifdef RTE_LIBRTE_VHOST_DEBUG
1068 /* TODO: enable it only in debug mode? */
1069 static void
1070 dump_guest_pages(struct virtio_net *dev)
1071 {
1072         uint32_t i;
1073         struct guest_page *page;
1074
1075         for (i = 0; i < dev->nr_guest_pages; i++) {
1076                 page = &dev->guest_pages[i];
1077
1078                 VHOST_LOG_CONFIG(INFO, "(%s) guest physical page region %u\n",
1079                                 dev->ifname, i);
1080                 VHOST_LOG_CONFIG(INFO, "(%s)\tguest_phys_addr: %" PRIx64 "\n",
1081                                 dev->ifname, page->guest_phys_addr);
1082                 VHOST_LOG_CONFIG(INFO, "(%s)\thost_phys_addr : %" PRIx64 "\n",
1083                                 dev->ifname, page->host_phys_addr);
1084                 VHOST_LOG_CONFIG(INFO, "(%s)\tsize           : %" PRIx64 "\n",
1085                                 dev->ifname, page->size);
1086         }
1087 }
1088 #else
1089 #define dump_guest_pages(dev)
1090 #endif
1091
1092 static bool
1093 vhost_memory_changed(struct VhostUserMemory *new,
1094                      struct rte_vhost_memory *old)
1095 {
1096         uint32_t i;
1097
1098         if (new->nregions != old->nregions)
1099                 return true;
1100
1101         for (i = 0; i < new->nregions; ++i) {
1102                 VhostUserMemoryRegion *new_r = &new->regions[i];
1103                 struct rte_vhost_mem_region *old_r = &old->regions[i];
1104
1105                 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
1106                         return true;
1107                 if (new_r->memory_size != old_r->size)
1108                         return true;
1109                 if (new_r->userspace_addr != old_r->guest_user_addr)
1110                         return true;
1111         }
1112
1113         return false;
1114 }
1115
1116 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
1117 static int
1118 vhost_user_postcopy_region_register(struct virtio_net *dev,
1119                 struct rte_vhost_mem_region *reg)
1120 {
1121         struct uffdio_register reg_struct;
1122
1123         /*
1124          * Let's register all the mmapped area to ensure
1125          * alignment on page boundary.
1126          */
1127         reg_struct.range.start = (uint64_t)(uintptr_t)reg->mmap_addr;
1128         reg_struct.range.len = reg->mmap_size;
1129         reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING;
1130
1131         if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER,
1132                                 &reg_struct)) {
1133                 VHOST_LOG_CONFIG(ERR, "(%s) failed to register ufd for region "
1134                                 "%" PRIx64 " - %" PRIx64 " (ufd = %d) %s\n",
1135                                 dev->ifname,
1136                                 (uint64_t)reg_struct.range.start,
1137                                 (uint64_t)reg_struct.range.start +
1138                                 (uint64_t)reg_struct.range.len - 1,
1139                                 dev->postcopy_ufd,
1140                                 strerror(errno));
1141                 return -1;
1142         }
1143
1144         VHOST_LOG_CONFIG(INFO,
1145                         "(%s)\t userfaultfd registered for range : %" PRIx64 " - %" PRIx64 "\n",
1146                         dev->ifname,
1147                         (uint64_t)reg_struct.range.start,
1148                         (uint64_t)reg_struct.range.start +
1149                         (uint64_t)reg_struct.range.len - 1);
1150
1151         return 0;
1152 }
1153 #else
1154 static int
1155 vhost_user_postcopy_region_register(struct virtio_net *dev __rte_unused,
1156                 struct rte_vhost_mem_region *reg __rte_unused)
1157 {
1158         return -1;
1159 }
1160 #endif
1161
1162 static int
1163 vhost_user_postcopy_register(struct virtio_net *dev, int main_fd,
1164                 struct vhu_msg_context *ctx)
1165 {
1166         struct VhostUserMemory *memory;
1167         struct rte_vhost_mem_region *reg;
1168         struct vhu_msg_context ack_ctx;
1169         uint32_t i;
1170
1171         if (!dev->postcopy_listening)
1172                 return 0;
1173
1174         /*
1175          * We haven't a better way right now than sharing
1176          * DPDK's virtual address with Qemu, so that Qemu can
1177          * retrieve the region offset when handling userfaults.
1178          */
1179         memory = &ctx->msg.payload.memory;
1180         for (i = 0; i < memory->nregions; i++) {
1181                 reg = &dev->mem->regions[i];
1182                 memory->regions[i].userspace_addr = reg->host_user_addr;
1183         }
1184
1185         /* Send the addresses back to qemu */
1186         ctx->fd_num = 0;
1187         send_vhost_reply(dev, main_fd, ctx);
1188
1189         /* Wait for qemu to acknowledge it got the addresses
1190          * we've got to wait before we're allowed to generate faults.
1191          */
1192         if (read_vhost_message(dev, main_fd, &ack_ctx) <= 0) {
1193                 VHOST_LOG_CONFIG(ERR, "(%s) failed to read qemu ack on postcopy set-mem-table\n",
1194                                 dev->ifname);
1195                 return -1;
1196         }
1197
1198         if (validate_msg_fds(dev, &ack_ctx, 0) != 0)
1199                 return -1;
1200
1201         if (ack_ctx.msg.request.master != VHOST_USER_SET_MEM_TABLE) {
1202                 VHOST_LOG_CONFIG(ERR, "(%s) bad qemu ack on postcopy set-mem-table (%d)\n",
1203                                 dev->ifname, ack_ctx.msg.request.master);
1204                 return -1;
1205         }
1206
1207         /* Now userfault register and we can use the memory */
1208         for (i = 0; i < memory->nregions; i++) {
1209                 reg = &dev->mem->regions[i];
1210                 if (vhost_user_postcopy_region_register(dev, reg) < 0)
1211                         return -1;
1212         }
1213
1214         return 0;
1215 }
1216
1217 static int
1218 vhost_user_mmap_region(struct virtio_net *dev,
1219                 struct rte_vhost_mem_region *region,
1220                 uint64_t mmap_offset)
1221 {
1222         void *mmap_addr;
1223         uint64_t mmap_size;
1224         uint64_t alignment;
1225         int populate;
1226         int ret;
1227
1228         /* Check for memory_size + mmap_offset overflow */
1229         if (mmap_offset >= -region->size) {
1230                 VHOST_LOG_CONFIG(ERR, "(%s) mmap_offset (%#"PRIx64") and memory_size (%#"PRIx64") overflow\n",
1231                                 dev->ifname, mmap_offset, region->size);
1232                 return -1;
1233         }
1234
1235         mmap_size = region->size + mmap_offset;
1236
1237         /* mmap() without flag of MAP_ANONYMOUS, should be called with length
1238          * argument aligned with hugepagesz at older longterm version Linux,
1239          * like 2.6.32 and 3.2.72, or mmap() will fail with EINVAL.
1240          *
1241          * To avoid failure, make sure in caller to keep length aligned.
1242          */
1243         alignment = get_blk_size(region->fd);
1244         if (alignment == (uint64_t)-1) {
1245                 VHOST_LOG_CONFIG(ERR, "(%s) couldn't get hugepage size through fstat\n",
1246                                 dev->ifname);
1247                 return -1;
1248         }
1249         mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
1250         if (mmap_size == 0) {
1251                 /*
1252                  * It could happen if initial mmap_size + alignment overflows
1253                  * the sizeof uint64, which could happen if either mmap_size or
1254                  * alignment value is wrong.
1255                  *
1256                  * mmap() kernel implementation would return an error, but
1257                  * better catch it before and provide useful info in the logs.
1258                  */
1259                 VHOST_LOG_CONFIG(ERR, "(%s) mmap size (0x%" PRIx64 ") or alignment (0x%" PRIx64 ") is invalid\n",
1260                                 dev->ifname, region->size + mmap_offset, alignment);
1261                 return -1;
1262         }
1263
1264         populate = dev->async_copy ? MAP_POPULATE : 0;
1265         mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
1266                         MAP_SHARED | populate, region->fd, 0);
1267
1268         if (mmap_addr == MAP_FAILED) {
1269                 VHOST_LOG_CONFIG(ERR, "(%s) mmap failed (%s).\n", dev->ifname, strerror(errno));
1270                 return -1;
1271         }
1272
1273         region->mmap_addr = mmap_addr;
1274         region->mmap_size = mmap_size;
1275         region->host_user_addr = (uint64_t)(uintptr_t)mmap_addr + mmap_offset;
1276
1277         if (dev->async_copy) {
1278                 if (add_guest_pages(dev, region, alignment) < 0) {
1279                         VHOST_LOG_CONFIG(ERR, "(%s) adding guest pages to region failed.\n",
1280                                         dev->ifname);
1281                         return -1;
1282                 }
1283
1284                 if (rte_vfio_is_enabled("vfio")) {
1285                         ret = async_dma_map(dev, region, true);
1286                         if (ret) {
1287                                 VHOST_LOG_CONFIG(ERR,
1288                                         "(%s) configure IOMMU for DMA engine failed\n",
1289                                         dev->ifname);
1290                                 return -1;
1291                         }
1292                 }
1293         }
1294
1295         VHOST_LOG_CONFIG(INFO, "(%s) guest memory region size: 0x%" PRIx64 "\n",
1296                         dev->ifname, region->size);
1297         VHOST_LOG_CONFIG(INFO, "(%s)\t guest physical addr: 0x%" PRIx64 "\n",
1298                         dev->ifname, region->guest_phys_addr);
1299         VHOST_LOG_CONFIG(INFO, "(%s)\t guest virtual  addr: 0x%" PRIx64 "\n",
1300                         dev->ifname, region->guest_user_addr);
1301         VHOST_LOG_CONFIG(INFO, "(%s)\t host  virtual  addr: 0x%" PRIx64 "\n",
1302                         dev->ifname, region->host_user_addr);
1303         VHOST_LOG_CONFIG(INFO, "(%s)\t mmap addr : 0x%" PRIx64 "\n",
1304                         dev->ifname, (uint64_t)(uintptr_t)mmap_addr);
1305         VHOST_LOG_CONFIG(INFO, "(%s)\t mmap size : 0x%" PRIx64 "\n",
1306                         dev->ifname, mmap_size);
1307         VHOST_LOG_CONFIG(INFO, "(%s)\t mmap align: 0x%" PRIx64 "\n",
1308                         dev->ifname, alignment);
1309         VHOST_LOG_CONFIG(INFO, "(%s)\t mmap off  : 0x%" PRIx64 "\n",
1310                         dev->ifname, mmap_offset);
1311
1312         return 0;
1313 }
1314
1315 static int
1316 vhost_user_set_mem_table(struct virtio_net **pdev,
1317                         struct vhu_msg_context *ctx,
1318                         int main_fd)
1319 {
1320         struct virtio_net *dev = *pdev;
1321         struct VhostUserMemory *memory = &ctx->msg.payload.memory;
1322         struct rte_vhost_mem_region *reg;
1323         int numa_node = SOCKET_ID_ANY;
1324         uint64_t mmap_offset;
1325         uint32_t i;
1326         bool async_notify = false;
1327
1328         if (validate_msg_fds(dev, ctx, memory->nregions) != 0)
1329                 return RTE_VHOST_MSG_RESULT_ERR;
1330
1331         if (memory->nregions > VHOST_MEMORY_MAX_NREGIONS) {
1332                 VHOST_LOG_CONFIG(ERR, "(%s) too many memory regions (%u)\n",
1333                                 dev->ifname, memory->nregions);
1334                 goto close_msg_fds;
1335         }
1336
1337         if (dev->mem && !vhost_memory_changed(memory, dev->mem)) {
1338                 VHOST_LOG_CONFIG(INFO, "(%s) memory regions not changed\n", dev->ifname);
1339
1340                 close_msg_fds(ctx);
1341
1342                 return RTE_VHOST_MSG_RESULT_OK;
1343         }
1344
1345         if (dev->mem) {
1346                 if (dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) {
1347                         struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
1348
1349                         if (vdpa_dev && vdpa_dev->ops->dev_close)
1350                                 vdpa_dev->ops->dev_close(dev->vid);
1351                         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1352                 }
1353
1354                 /* notify the vhost application to stop DMA transfers */
1355                 if (dev->async_copy && dev->notify_ops->vring_state_changed) {
1356                         for (i = 0; i < dev->nr_vring; i++) {
1357                                 dev->notify_ops->vring_state_changed(dev->vid,
1358                                                 i, 0);
1359                         }
1360                         async_notify = true;
1361                 }
1362
1363                 free_mem_region(dev);
1364                 rte_free(dev->mem);
1365                 dev->mem = NULL;
1366         }
1367
1368         /* Flush IOTLB cache as previous HVAs are now invalid */
1369         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1370                 for (i = 0; i < dev->nr_vring; i++)
1371                         vhost_user_iotlb_flush_all(dev->virtqueue[i]);
1372
1373         /*
1374          * If VQ 0 has already been allocated, try to allocate on the same
1375          * NUMA node. It can be reallocated later in numa_realloc().
1376          */
1377         if (dev->nr_vring > 0)
1378                 numa_node = dev->virtqueue[0]->numa_node;
1379
1380         dev->nr_guest_pages = 0;
1381         if (dev->guest_pages == NULL) {
1382                 dev->max_guest_pages = 8;
1383                 dev->guest_pages = rte_zmalloc_socket(NULL,
1384                                         dev->max_guest_pages *
1385                                         sizeof(struct guest_page),
1386                                         RTE_CACHE_LINE_SIZE,
1387                                         numa_node);
1388                 if (dev->guest_pages == NULL) {
1389                         VHOST_LOG_CONFIG(ERR,
1390                                 "(%s) failed to allocate memory for dev->guest_pages\n",
1391                                 dev->ifname);
1392                         goto close_msg_fds;
1393                 }
1394         }
1395
1396         dev->mem = rte_zmalloc_socket("vhost-mem-table", sizeof(struct rte_vhost_memory) +
1397                 sizeof(struct rte_vhost_mem_region) * memory->nregions, 0, numa_node);
1398         if (dev->mem == NULL) {
1399                 VHOST_LOG_CONFIG(ERR,
1400                         "(%s) failed to allocate memory for dev->mem\n",
1401                         dev->ifname);
1402                 goto free_guest_pages;
1403         }
1404
1405         for (i = 0; i < memory->nregions; i++) {
1406                 reg = &dev->mem->regions[i];
1407
1408                 reg->guest_phys_addr = memory->regions[i].guest_phys_addr;
1409                 reg->guest_user_addr = memory->regions[i].userspace_addr;
1410                 reg->size            = memory->regions[i].memory_size;
1411                 reg->fd              = ctx->fds[i];
1412
1413                 /*
1414                  * Assign invalid file descriptor value to avoid double
1415                  * closing on error path.
1416                  */
1417                 ctx->fds[i] = -1;
1418
1419                 mmap_offset = memory->regions[i].mmap_offset;
1420
1421                 if (vhost_user_mmap_region(dev, reg, mmap_offset) < 0) {
1422                         VHOST_LOG_CONFIG(ERR, "(%s) failed to mmap region %u\n", dev->ifname, i);
1423                         goto free_mem_table;
1424                 }
1425
1426                 dev->mem->nregions++;
1427         }
1428
1429         if (vhost_user_postcopy_register(dev, main_fd, ctx) < 0)
1430                 goto free_mem_table;
1431
1432         for (i = 0; i < dev->nr_vring; i++) {
1433                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1434
1435                 if (!vq)
1436                         continue;
1437
1438                 if (vq->desc || vq->avail || vq->used) {
1439                         /*
1440                          * If the memory table got updated, the ring addresses
1441                          * need to be translated again as virtual addresses have
1442                          * changed.
1443                          */
1444                         vring_invalidate(dev, vq);
1445
1446                         dev = translate_ring_addresses(dev, i);
1447                         if (!dev) {
1448                                 dev = *pdev;
1449                                 goto free_mem_table;
1450                         }
1451
1452                         *pdev = dev;
1453                 }
1454         }
1455
1456         dump_guest_pages(dev);
1457
1458         if (async_notify) {
1459                 for (i = 0; i < dev->nr_vring; i++)
1460                         dev->notify_ops->vring_state_changed(dev->vid, i, 1);
1461         }
1462
1463         return RTE_VHOST_MSG_RESULT_OK;
1464
1465 free_mem_table:
1466         free_mem_region(dev);
1467         rte_free(dev->mem);
1468         dev->mem = NULL;
1469
1470 free_guest_pages:
1471         rte_free(dev->guest_pages);
1472         dev->guest_pages = NULL;
1473 close_msg_fds:
1474         close_msg_fds(ctx);
1475         return RTE_VHOST_MSG_RESULT_ERR;
1476 }
1477
1478 static bool
1479 vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq)
1480 {
1481         bool rings_ok;
1482
1483         if (!vq)
1484                 return false;
1485
1486         if (vq_is_packed(dev))
1487                 rings_ok = vq->desc_packed && vq->driver_event &&
1488                         vq->device_event;
1489         else
1490                 rings_ok = vq->desc && vq->avail && vq->used;
1491
1492         return rings_ok &&
1493                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1494                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1495                vq->enabled;
1496 }
1497
1498 #define VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY 2u
1499
1500 static int
1501 virtio_is_ready(struct virtio_net *dev)
1502 {
1503         struct vhost_virtqueue *vq;
1504         uint32_t i, nr_vring = dev->nr_vring;
1505
1506         if (dev->flags & VIRTIO_DEV_READY)
1507                 return 1;
1508
1509         if (!dev->nr_vring)
1510                 return 0;
1511
1512         if (dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) {
1513                 nr_vring = VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY;
1514
1515                 if (dev->nr_vring < nr_vring)
1516                         return 0;
1517         }
1518
1519         for (i = 0; i < nr_vring; i++) {
1520                 vq = dev->virtqueue[i];
1521
1522                 if (!vq_is_ready(dev, vq))
1523                         return 0;
1524         }
1525
1526         /* If supported, ensure the frontend is really done with config */
1527         if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS))
1528                 if (!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK))
1529                         return 0;
1530
1531         dev->flags |= VIRTIO_DEV_READY;
1532
1533         if (!(dev->flags & VIRTIO_DEV_RUNNING))
1534                 VHOST_LOG_CONFIG(INFO, "(%s) virtio is now ready for processing.\n", dev->ifname);
1535         return 1;
1536 }
1537
1538 static void *
1539 inflight_mem_alloc(struct virtio_net *dev, const char *name, size_t size, int *fd)
1540 {
1541         void *ptr;
1542         int mfd = -1;
1543         char fname[20] = "/tmp/memfd-XXXXXX";
1544
1545         *fd = -1;
1546 #ifdef MEMFD_SUPPORTED
1547         mfd = memfd_create(name, MFD_CLOEXEC);
1548 #else
1549         RTE_SET_USED(name);
1550 #endif
1551         if (mfd == -1) {
1552                 mfd = mkstemp(fname);
1553                 if (mfd == -1) {
1554                         VHOST_LOG_CONFIG(ERR, "(%s) failed to get inflight buffer fd\n",
1555                                         dev->ifname);
1556                         return NULL;
1557                 }
1558
1559                 unlink(fname);
1560         }
1561
1562         if (ftruncate(mfd, size) == -1) {
1563                 VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc inflight buffer\n", dev->ifname);
1564                 close(mfd);
1565                 return NULL;
1566         }
1567
1568         ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
1569         if (ptr == MAP_FAILED) {
1570                 VHOST_LOG_CONFIG(ERR, "(%s) failed to mmap inflight buffer\n", dev->ifname);
1571                 close(mfd);
1572                 return NULL;
1573         }
1574
1575         *fd = mfd;
1576         return ptr;
1577 }
1578
1579 static uint32_t
1580 get_pervq_shm_size_split(uint16_t queue_size)
1581 {
1582         return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_split) *
1583                                   queue_size + sizeof(uint64_t) +
1584                                   sizeof(uint16_t) * 4, INFLIGHT_ALIGNMENT);
1585 }
1586
1587 static uint32_t
1588 get_pervq_shm_size_packed(uint16_t queue_size)
1589 {
1590         return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_packed)
1591                                   * queue_size + sizeof(uint64_t) +
1592                                   sizeof(uint16_t) * 6 + sizeof(uint8_t) * 9,
1593                                   INFLIGHT_ALIGNMENT);
1594 }
1595
1596 static int
1597 vhost_user_get_inflight_fd(struct virtio_net **pdev,
1598                            struct vhu_msg_context *ctx,
1599                            int main_fd __rte_unused)
1600 {
1601         struct rte_vhost_inflight_info_packed *inflight_packed;
1602         uint64_t pervq_inflight_size, mmap_size;
1603         uint16_t num_queues, queue_size;
1604         struct virtio_net *dev = *pdev;
1605         int fd, i, j;
1606         int numa_node = SOCKET_ID_ANY;
1607         void *addr;
1608
1609         if (ctx->msg.size != sizeof(ctx->msg.payload.inflight)) {
1610                 VHOST_LOG_CONFIG(ERR, "(%s) invalid get_inflight_fd message size is %d\n",
1611                         dev->ifname, ctx->msg.size);
1612                 return RTE_VHOST_MSG_RESULT_ERR;
1613         }
1614
1615         /*
1616          * If VQ 0 has already been allocated, try to allocate on the same
1617          * NUMA node. It can be reallocated later in numa_realloc().
1618          */
1619         if (dev->nr_vring > 0)
1620                 numa_node = dev->virtqueue[0]->numa_node;
1621
1622         if (dev->inflight_info == NULL) {
1623                 dev->inflight_info = rte_zmalloc_socket("inflight_info",
1624                                 sizeof(struct inflight_mem_info), 0, numa_node);
1625                 if (!dev->inflight_info) {
1626                         VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc dev inflight area\n",
1627                                         dev->ifname);
1628                         return RTE_VHOST_MSG_RESULT_ERR;
1629                 }
1630                 dev->inflight_info->fd = -1;
1631         }
1632
1633         num_queues = ctx->msg.payload.inflight.num_queues;
1634         queue_size = ctx->msg.payload.inflight.queue_size;
1635
1636         VHOST_LOG_CONFIG(INFO, "(%s) get_inflight_fd num_queues: %u\n",
1637                 dev->ifname, ctx->msg.payload.inflight.num_queues);
1638         VHOST_LOG_CONFIG(INFO, "(%s) get_inflight_fd queue_size: %u\n",
1639                 dev->ifname, ctx->msg.payload.inflight.queue_size);
1640
1641         if (vq_is_packed(dev))
1642                 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1643         else
1644                 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1645
1646         mmap_size = num_queues * pervq_inflight_size;
1647         addr = inflight_mem_alloc(dev, "vhost-inflight", mmap_size, &fd);
1648         if (!addr) {
1649                 VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc vhost inflight area\n", dev->ifname);
1650                         ctx->msg.payload.inflight.mmap_size = 0;
1651                 return RTE_VHOST_MSG_RESULT_ERR;
1652         }
1653         memset(addr, 0, mmap_size);
1654
1655         if (dev->inflight_info->addr) {
1656                 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1657                 dev->inflight_info->addr = NULL;
1658         }
1659
1660         if (dev->inflight_info->fd >= 0) {
1661                 close(dev->inflight_info->fd);
1662                 dev->inflight_info->fd = -1;
1663         }
1664
1665         dev->inflight_info->addr = addr;
1666         dev->inflight_info->size = ctx->msg.payload.inflight.mmap_size = mmap_size;
1667         dev->inflight_info->fd = ctx->fds[0] = fd;
1668         ctx->msg.payload.inflight.mmap_offset = 0;
1669         ctx->fd_num = 1;
1670
1671         if (vq_is_packed(dev)) {
1672                 for (i = 0; i < num_queues; i++) {
1673                         inflight_packed =
1674                                 (struct rte_vhost_inflight_info_packed *)addr;
1675                         inflight_packed->used_wrap_counter = 1;
1676                         inflight_packed->old_used_wrap_counter = 1;
1677                         for (j = 0; j < queue_size; j++)
1678                                 inflight_packed->desc[j].next = j + 1;
1679                         addr = (void *)((char *)addr + pervq_inflight_size);
1680                 }
1681         }
1682
1683         VHOST_LOG_CONFIG(INFO, "(%s) send inflight mmap_size: %"PRIu64"\n",
1684                         dev->ifname, ctx->msg.payload.inflight.mmap_size);
1685         VHOST_LOG_CONFIG(INFO, "(%s) send inflight mmap_offset: %"PRIu64"\n",
1686                         dev->ifname, ctx->msg.payload.inflight.mmap_offset);
1687         VHOST_LOG_CONFIG(INFO, "(%s) send inflight fd: %d\n", dev->ifname, ctx->fds[0]);
1688
1689         return RTE_VHOST_MSG_RESULT_REPLY;
1690 }
1691
1692 static int
1693 vhost_user_set_inflight_fd(struct virtio_net **pdev,
1694                            struct vhu_msg_context *ctx,
1695                            int main_fd __rte_unused)
1696 {
1697         uint64_t mmap_size, mmap_offset;
1698         uint16_t num_queues, queue_size;
1699         struct virtio_net *dev = *pdev;
1700         uint32_t pervq_inflight_size;
1701         struct vhost_virtqueue *vq;
1702         void *addr;
1703         int fd, i;
1704         int numa_node = SOCKET_ID_ANY;
1705
1706         fd = ctx->fds[0];
1707         if (ctx->msg.size != sizeof(ctx->msg.payload.inflight) || fd < 0) {
1708                 VHOST_LOG_CONFIG(ERR, "(%s) invalid set_inflight_fd message size is %d,fd is %d\n",
1709                         dev->ifname, ctx->msg.size, fd);
1710                 return RTE_VHOST_MSG_RESULT_ERR;
1711         }
1712
1713         mmap_size = ctx->msg.payload.inflight.mmap_size;
1714         mmap_offset = ctx->msg.payload.inflight.mmap_offset;
1715         num_queues = ctx->msg.payload.inflight.num_queues;
1716         queue_size = ctx->msg.payload.inflight.queue_size;
1717
1718         if (vq_is_packed(dev))
1719                 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1720         else
1721                 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1722
1723         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd mmap_size: %"PRIu64"\n",
1724                         dev->ifname, mmap_size);
1725         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd mmap_offset: %"PRIu64"\n",
1726                         dev->ifname, mmap_offset);
1727         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd num_queues: %u\n", dev->ifname, num_queues);
1728         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd queue_size: %u\n", dev->ifname, queue_size);
1729         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd fd: %d\n", dev->ifname, fd);
1730         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd pervq_inflight_size: %d\n",
1731                         dev->ifname, pervq_inflight_size);
1732
1733         /*
1734          * If VQ 0 has already been allocated, try to allocate on the same
1735          * NUMA node. It can be reallocated later in numa_realloc().
1736          */
1737         if (dev->nr_vring > 0)
1738                 numa_node = dev->virtqueue[0]->numa_node;
1739
1740         if (!dev->inflight_info) {
1741                 dev->inflight_info = rte_zmalloc_socket("inflight_info",
1742                                 sizeof(struct inflight_mem_info), 0, numa_node);
1743                 if (dev->inflight_info == NULL) {
1744                         VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc dev inflight area\n",
1745                                         dev->ifname);
1746                         return RTE_VHOST_MSG_RESULT_ERR;
1747                 }
1748                 dev->inflight_info->fd = -1;
1749         }
1750
1751         if (dev->inflight_info->addr) {
1752                 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1753                 dev->inflight_info->addr = NULL;
1754         }
1755
1756         addr = mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
1757                     fd, mmap_offset);
1758         if (addr == MAP_FAILED) {
1759                 VHOST_LOG_CONFIG(ERR, "(%s) failed to mmap share memory.\n", dev->ifname);
1760                 return RTE_VHOST_MSG_RESULT_ERR;
1761         }
1762
1763         if (dev->inflight_info->fd >= 0) {
1764                 close(dev->inflight_info->fd);
1765                 dev->inflight_info->fd = -1;
1766         }
1767
1768         dev->inflight_info->fd = fd;
1769         dev->inflight_info->addr = addr;
1770         dev->inflight_info->size = mmap_size;
1771
1772         for (i = 0; i < num_queues; i++) {
1773                 vq = dev->virtqueue[i];
1774                 if (!vq)
1775                         continue;
1776
1777                 if (vq_is_packed(dev)) {
1778                         vq->inflight_packed = addr;
1779                         vq->inflight_packed->desc_num = queue_size;
1780                 } else {
1781                         vq->inflight_split = addr;
1782                         vq->inflight_split->desc_num = queue_size;
1783                 }
1784                 addr = (void *)((char *)addr + pervq_inflight_size);
1785         }
1786
1787         return RTE_VHOST_MSG_RESULT_OK;
1788 }
1789
1790 static int
1791 vhost_user_set_vring_call(struct virtio_net **pdev,
1792                         struct vhu_msg_context *ctx,
1793                         int main_fd __rte_unused)
1794 {
1795         struct virtio_net *dev = *pdev;
1796         struct vhost_vring_file file;
1797         struct vhost_virtqueue *vq;
1798         int expected_fds;
1799
1800         expected_fds = (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1801         if (validate_msg_fds(dev, ctx, expected_fds) != 0)
1802                 return RTE_VHOST_MSG_RESULT_ERR;
1803
1804         file.index = ctx->msg.payload.u64 & VHOST_USER_VRING_IDX_MASK;
1805         if (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1806                 file.fd = VIRTIO_INVALID_EVENTFD;
1807         else
1808                 file.fd = ctx->fds[0];
1809         VHOST_LOG_CONFIG(INFO, "(%s) vring call idx:%d file:%d\n",
1810                         dev->ifname, file.index, file.fd);
1811
1812         vq = dev->virtqueue[file.index];
1813
1814         if (vq->ready) {
1815                 vq->ready = false;
1816                 vhost_user_notify_queue_state(dev, file.index, 0);
1817         }
1818
1819         if (vq->callfd >= 0)
1820                 close(vq->callfd);
1821
1822         vq->callfd = file.fd;
1823
1824         return RTE_VHOST_MSG_RESULT_OK;
1825 }
1826
1827 static int vhost_user_set_vring_err(struct virtio_net **pdev,
1828                         struct vhu_msg_context *ctx,
1829                         int main_fd __rte_unused)
1830 {
1831         struct virtio_net *dev = *pdev;
1832         int expected_fds;
1833
1834         expected_fds = (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1835         if (validate_msg_fds(dev, ctx, expected_fds) != 0)
1836                 return RTE_VHOST_MSG_RESULT_ERR;
1837
1838         if (!(ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1839                 close(ctx->fds[0]);
1840         VHOST_LOG_CONFIG(INFO, "(%s) not implemented\n", dev->ifname);
1841
1842         return RTE_VHOST_MSG_RESULT_OK;
1843 }
1844
1845 static int
1846 resubmit_desc_compare(const void *a, const void *b)
1847 {
1848         const struct rte_vhost_resubmit_desc *desc0 = a;
1849         const struct rte_vhost_resubmit_desc *desc1 = b;
1850
1851         if (desc1->counter > desc0->counter)
1852                 return 1;
1853
1854         return -1;
1855 }
1856
1857 static int
1858 vhost_check_queue_inflights_split(struct virtio_net *dev,
1859                                   struct vhost_virtqueue *vq)
1860 {
1861         uint16_t i;
1862         uint16_t resubmit_num = 0, last_io, num;
1863         struct vring_used *used = vq->used;
1864         struct rte_vhost_resubmit_info *resubmit;
1865         struct rte_vhost_inflight_info_split *inflight_split;
1866
1867         if (!(dev->protocol_features &
1868             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1869                 return RTE_VHOST_MSG_RESULT_OK;
1870
1871         /* The frontend may still not support the inflight feature
1872          * although we negotiate the protocol feature.
1873          */
1874         if ((!vq->inflight_split))
1875                 return RTE_VHOST_MSG_RESULT_OK;
1876
1877         if (!vq->inflight_split->version) {
1878                 vq->inflight_split->version = INFLIGHT_VERSION;
1879                 return RTE_VHOST_MSG_RESULT_OK;
1880         }
1881
1882         if (vq->resubmit_inflight)
1883                 return RTE_VHOST_MSG_RESULT_OK;
1884
1885         inflight_split = vq->inflight_split;
1886         vq->global_counter = 0;
1887         last_io = inflight_split->last_inflight_io;
1888
1889         if (inflight_split->used_idx != used->idx) {
1890                 inflight_split->desc[last_io].inflight = 0;
1891                 rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
1892                 inflight_split->used_idx = used->idx;
1893         }
1894
1895         for (i = 0; i < inflight_split->desc_num; i++) {
1896                 if (inflight_split->desc[i].inflight == 1)
1897                         resubmit_num++;
1898         }
1899
1900         vq->last_avail_idx += resubmit_num;
1901
1902         if (resubmit_num) {
1903                 resubmit = rte_zmalloc_socket("resubmit", sizeof(struct rte_vhost_resubmit_info),
1904                                 0, vq->numa_node);
1905                 if (!resubmit) {
1906                         VHOST_LOG_CONFIG(ERR,
1907                                         "(%s) failed to allocate memory for resubmit info.\n",
1908                                         dev->ifname);
1909                         return RTE_VHOST_MSG_RESULT_ERR;
1910                 }
1911
1912                 resubmit->resubmit_list = rte_zmalloc_socket("resubmit_list",
1913                                 resubmit_num * sizeof(struct rte_vhost_resubmit_desc),
1914                                 0, vq->numa_node);
1915                 if (!resubmit->resubmit_list) {
1916                         VHOST_LOG_CONFIG(ERR,
1917                                         "(%s) failed to allocate memory for inflight desc.\n",
1918                                         dev->ifname);
1919                         rte_free(resubmit);
1920                         return RTE_VHOST_MSG_RESULT_ERR;
1921                 }
1922
1923                 num = 0;
1924                 for (i = 0; i < vq->inflight_split->desc_num; i++) {
1925                         if (vq->inflight_split->desc[i].inflight == 1) {
1926                                 resubmit->resubmit_list[num].index = i;
1927                                 resubmit->resubmit_list[num].counter =
1928                                         inflight_split->desc[i].counter;
1929                                 num++;
1930                         }
1931                 }
1932                 resubmit->resubmit_num = num;
1933
1934                 if (resubmit->resubmit_num > 1)
1935                         qsort(resubmit->resubmit_list, resubmit->resubmit_num,
1936                               sizeof(struct rte_vhost_resubmit_desc),
1937                               resubmit_desc_compare);
1938
1939                 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
1940                 vq->resubmit_inflight = resubmit;
1941         }
1942
1943         return RTE_VHOST_MSG_RESULT_OK;
1944 }
1945
1946 static int
1947 vhost_check_queue_inflights_packed(struct virtio_net *dev,
1948                                    struct vhost_virtqueue *vq)
1949 {
1950         uint16_t i;
1951         uint16_t resubmit_num = 0, old_used_idx, num;
1952         struct rte_vhost_resubmit_info *resubmit;
1953         struct rte_vhost_inflight_info_packed *inflight_packed;
1954
1955         if (!(dev->protocol_features &
1956             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1957                 return RTE_VHOST_MSG_RESULT_OK;
1958
1959         /* The frontend may still not support the inflight feature
1960          * although we negotiate the protocol feature.
1961          */
1962         if ((!vq->inflight_packed))
1963                 return RTE_VHOST_MSG_RESULT_OK;
1964
1965         if (!vq->inflight_packed->version) {
1966                 vq->inflight_packed->version = INFLIGHT_VERSION;
1967                 return RTE_VHOST_MSG_RESULT_OK;
1968         }
1969
1970         if (vq->resubmit_inflight)
1971                 return RTE_VHOST_MSG_RESULT_OK;
1972
1973         inflight_packed = vq->inflight_packed;
1974         vq->global_counter = 0;
1975         old_used_idx = inflight_packed->old_used_idx;
1976
1977         if (inflight_packed->used_idx != old_used_idx) {
1978                 if (inflight_packed->desc[old_used_idx].inflight == 0) {
1979                         inflight_packed->old_used_idx =
1980                                 inflight_packed->used_idx;
1981                         inflight_packed->old_used_wrap_counter =
1982                                 inflight_packed->used_wrap_counter;
1983                         inflight_packed->old_free_head =
1984                                 inflight_packed->free_head;
1985                 } else {
1986                         inflight_packed->used_idx =
1987                                 inflight_packed->old_used_idx;
1988                         inflight_packed->used_wrap_counter =
1989                                 inflight_packed->old_used_wrap_counter;
1990                         inflight_packed->free_head =
1991                                 inflight_packed->old_free_head;
1992                 }
1993         }
1994
1995         for (i = 0; i < inflight_packed->desc_num; i++) {
1996                 if (inflight_packed->desc[i].inflight == 1)
1997                         resubmit_num++;
1998         }
1999
2000         if (resubmit_num) {
2001                 resubmit = rte_zmalloc_socket("resubmit", sizeof(struct rte_vhost_resubmit_info),
2002                                 0, vq->numa_node);
2003                 if (resubmit == NULL) {
2004                         VHOST_LOG_CONFIG(ERR,
2005                                         "(%s) failed to allocate memory for resubmit info.\n",
2006                                         dev->ifname);
2007                         return RTE_VHOST_MSG_RESULT_ERR;
2008                 }
2009
2010                 resubmit->resubmit_list = rte_zmalloc_socket("resubmit_list",
2011                                 resubmit_num * sizeof(struct rte_vhost_resubmit_desc),
2012                                 0, vq->numa_node);
2013                 if (resubmit->resubmit_list == NULL) {
2014                         VHOST_LOG_CONFIG(ERR,
2015                                         "(%s) failed to allocate memory for resubmit desc.\n",
2016                                         dev->ifname);
2017                         rte_free(resubmit);
2018                         return RTE_VHOST_MSG_RESULT_ERR;
2019                 }
2020
2021                 num = 0;
2022                 for (i = 0; i < inflight_packed->desc_num; i++) {
2023                         if (vq->inflight_packed->desc[i].inflight == 1) {
2024                                 resubmit->resubmit_list[num].index = i;
2025                                 resubmit->resubmit_list[num].counter =
2026                                         inflight_packed->desc[i].counter;
2027                                 num++;
2028                         }
2029                 }
2030                 resubmit->resubmit_num = num;
2031
2032                 if (resubmit->resubmit_num > 1)
2033                         qsort(resubmit->resubmit_list, resubmit->resubmit_num,
2034                               sizeof(struct rte_vhost_resubmit_desc),
2035                               resubmit_desc_compare);
2036
2037                 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
2038                 vq->resubmit_inflight = resubmit;
2039         }
2040
2041         return RTE_VHOST_MSG_RESULT_OK;
2042 }
2043
2044 static int
2045 vhost_user_set_vring_kick(struct virtio_net **pdev,
2046                         struct vhu_msg_context *ctx,
2047                         int main_fd __rte_unused)
2048 {
2049         struct virtio_net *dev = *pdev;
2050         struct vhost_vring_file file;
2051         struct vhost_virtqueue *vq;
2052         int expected_fds;
2053
2054         expected_fds = (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
2055         if (validate_msg_fds(dev, ctx, expected_fds) != 0)
2056                 return RTE_VHOST_MSG_RESULT_ERR;
2057
2058         file.index = ctx->msg.payload.u64 & VHOST_USER_VRING_IDX_MASK;
2059         if (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK)
2060                 file.fd = VIRTIO_INVALID_EVENTFD;
2061         else
2062                 file.fd = ctx->fds[0];
2063         VHOST_LOG_CONFIG(INFO, "(%s) vring kick idx:%d file:%d\n",
2064                         dev->ifname, file.index, file.fd);
2065
2066         /* Interpret ring addresses only when ring is started. */
2067         dev = translate_ring_addresses(dev, file.index);
2068         if (!dev) {
2069                 if (file.fd != VIRTIO_INVALID_EVENTFD)
2070                         close(file.fd);
2071
2072                 return RTE_VHOST_MSG_RESULT_ERR;
2073         }
2074
2075         *pdev = dev;
2076
2077         vq = dev->virtqueue[file.index];
2078
2079         /*
2080          * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
2081          * the ring starts already enabled. Otherwise, it is enabled via
2082          * the SET_VRING_ENABLE message.
2083          */
2084         if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
2085                 vq->enabled = true;
2086         }
2087
2088         if (vq->ready) {
2089                 vq->ready = false;
2090                 vhost_user_notify_queue_state(dev, file.index, 0);
2091         }
2092
2093         if (vq->kickfd >= 0)
2094                 close(vq->kickfd);
2095         vq->kickfd = file.fd;
2096
2097         if (vq_is_packed(dev)) {
2098                 if (vhost_check_queue_inflights_packed(dev, vq)) {
2099                         VHOST_LOG_CONFIG(ERR, "(%s) failed to inflights for vq: %d\n",
2100                                         dev->ifname, file.index);
2101                         return RTE_VHOST_MSG_RESULT_ERR;
2102                 }
2103         } else {
2104                 if (vhost_check_queue_inflights_split(dev, vq)) {
2105                         VHOST_LOG_CONFIG(ERR, "(%s) failed to inflights for vq: %d\n",
2106                                         dev->ifname, file.index);
2107                         return RTE_VHOST_MSG_RESULT_ERR;
2108                 }
2109         }
2110
2111         return RTE_VHOST_MSG_RESULT_OK;
2112 }
2113
2114 /*
2115  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
2116  */
2117 static int
2118 vhost_user_get_vring_base(struct virtio_net **pdev,
2119                         struct vhu_msg_context *ctx,
2120                         int main_fd __rte_unused)
2121 {
2122         struct virtio_net *dev = *pdev;
2123         struct vhost_virtqueue *vq = dev->virtqueue[ctx->msg.payload.state.index];
2124         uint64_t val;
2125
2126         if (validate_msg_fds(dev, ctx, 0) != 0)
2127                 return RTE_VHOST_MSG_RESULT_ERR;
2128
2129         /* We have to stop the queue (virtio) if it is running. */
2130         vhost_destroy_device_notify(dev);
2131
2132         dev->flags &= ~VIRTIO_DEV_READY;
2133         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
2134
2135         /* Here we are safe to get the indexes */
2136         if (vq_is_packed(dev)) {
2137                 /*
2138                  * Bit[0:14]: avail index
2139                  * Bit[15]: avail wrap counter
2140                  */
2141                 val = vq->last_avail_idx & 0x7fff;
2142                 val |= vq->avail_wrap_counter << 15;
2143                 ctx->msg.payload.state.num = val;
2144         } else {
2145                 ctx->msg.payload.state.num = vq->last_avail_idx;
2146         }
2147
2148         VHOST_LOG_CONFIG(INFO, "(%s) vring base idx:%d file:%d\n",
2149                         dev->ifname, ctx->msg.payload.state.index,
2150                         ctx->msg.payload.state.num);
2151         /*
2152          * Based on current qemu vhost-user implementation, this message is
2153          * sent and only sent in vhost_vring_stop.
2154          * TODO: cleanup the vring, it isn't usable since here.
2155          */
2156         if (vq->kickfd >= 0)
2157                 close(vq->kickfd);
2158
2159         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
2160
2161         if (vq->callfd >= 0)
2162                 close(vq->callfd);
2163
2164         vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
2165
2166         vq->signalled_used_valid = false;
2167
2168         if (vq_is_packed(dev)) {
2169                 rte_free(vq->shadow_used_packed);
2170                 vq->shadow_used_packed = NULL;
2171         } else {
2172                 rte_free(vq->shadow_used_split);
2173                 vq->shadow_used_split = NULL;
2174         }
2175
2176         rte_free(vq->batch_copy_elems);
2177         vq->batch_copy_elems = NULL;
2178
2179         rte_free(vq->log_cache);
2180         vq->log_cache = NULL;
2181
2182         ctx->msg.size = sizeof(ctx->msg.payload.state);
2183         ctx->fd_num = 0;
2184
2185         vhost_user_iotlb_flush_all(vq);
2186
2187         vring_invalidate(dev, vq);
2188
2189         return RTE_VHOST_MSG_RESULT_REPLY;
2190 }
2191
2192 /*
2193  * when virtio queues are ready to work, qemu will send us to
2194  * enable the virtio queue pair.
2195  */
2196 static int
2197 vhost_user_set_vring_enable(struct virtio_net **pdev,
2198                         struct vhu_msg_context *ctx,
2199                         int main_fd __rte_unused)
2200 {
2201         struct virtio_net *dev = *pdev;
2202         bool enable = !!ctx->msg.payload.state.num;
2203         int index = (int)ctx->msg.payload.state.index;
2204
2205         if (validate_msg_fds(dev, ctx, 0) != 0)
2206                 return RTE_VHOST_MSG_RESULT_ERR;
2207
2208         VHOST_LOG_CONFIG(INFO, "(%s) set queue enable: %d to qp idx: %d\n",
2209                         dev->ifname, enable, index);
2210
2211         if (enable && dev->virtqueue[index]->async) {
2212                 if (dev->virtqueue[index]->async->pkts_inflight_n) {
2213                         VHOST_LOG_CONFIG(ERR,
2214                                 "(%s) failed to enable vring. Inflight packets must be completed first\n",
2215                                 dev->ifname);
2216                         return RTE_VHOST_MSG_RESULT_ERR;
2217                 }
2218         }
2219
2220         dev->virtqueue[index]->enabled = enable;
2221
2222         return RTE_VHOST_MSG_RESULT_OK;
2223 }
2224
2225 static int
2226 vhost_user_get_protocol_features(struct virtio_net **pdev,
2227                         struct vhu_msg_context *ctx,
2228                         int main_fd __rte_unused)
2229 {
2230         struct virtio_net *dev = *pdev;
2231         uint64_t features, protocol_features;
2232
2233         if (validate_msg_fds(dev, ctx, 0) != 0)
2234                 return RTE_VHOST_MSG_RESULT_ERR;
2235
2236         rte_vhost_driver_get_features(dev->ifname, &features);
2237         rte_vhost_driver_get_protocol_features(dev->ifname, &protocol_features);
2238
2239         ctx->msg.payload.u64 = protocol_features;
2240         ctx->msg.size = sizeof(ctx->msg.payload.u64);
2241         ctx->fd_num = 0;
2242
2243         return RTE_VHOST_MSG_RESULT_REPLY;
2244 }
2245
2246 static int
2247 vhost_user_set_protocol_features(struct virtio_net **pdev,
2248                         struct vhu_msg_context *ctx,
2249                         int main_fd __rte_unused)
2250 {
2251         struct virtio_net *dev = *pdev;
2252         uint64_t protocol_features = ctx->msg.payload.u64;
2253         uint64_t slave_protocol_features = 0;
2254
2255         if (validate_msg_fds(dev, ctx, 0) != 0)
2256                 return RTE_VHOST_MSG_RESULT_ERR;
2257
2258         rte_vhost_driver_get_protocol_features(dev->ifname,
2259                         &slave_protocol_features);
2260         if (protocol_features & ~slave_protocol_features) {
2261                 VHOST_LOG_CONFIG(ERR, "(%s) received invalid protocol features.\n", dev->ifname);
2262                 return RTE_VHOST_MSG_RESULT_ERR;
2263         }
2264
2265         dev->protocol_features = protocol_features;
2266         VHOST_LOG_CONFIG(INFO, "(%s) negotiated Vhost-user protocol features: 0x%" PRIx64 "\n",
2267                 dev->ifname, dev->protocol_features);
2268
2269         return RTE_VHOST_MSG_RESULT_OK;
2270 }
2271
2272 static int
2273 vhost_user_set_log_base(struct virtio_net **pdev,
2274                         struct vhu_msg_context *ctx,
2275                         int main_fd __rte_unused)
2276 {
2277         struct virtio_net *dev = *pdev;
2278         int fd = ctx->fds[0];
2279         uint64_t size, off;
2280         void *addr;
2281         uint32_t i;
2282
2283         if (validate_msg_fds(dev, ctx, 1) != 0)
2284                 return RTE_VHOST_MSG_RESULT_ERR;
2285
2286         if (fd < 0) {
2287                 VHOST_LOG_CONFIG(ERR, "(%s) invalid log fd: %d\n", dev->ifname, fd);
2288                 return RTE_VHOST_MSG_RESULT_ERR;
2289         }
2290
2291         if (ctx->msg.size != sizeof(VhostUserLog)) {
2292                 VHOST_LOG_CONFIG(ERR, "(%s) invalid log base msg size: %"PRId32" != %d\n",
2293                         dev->ifname, ctx->msg.size, (int)sizeof(VhostUserLog));
2294                 goto close_msg_fds;
2295         }
2296
2297         size = ctx->msg.payload.log.mmap_size;
2298         off  = ctx->msg.payload.log.mmap_offset;
2299
2300         /* Check for mmap size and offset overflow. */
2301         if (off >= -size) {
2302                 VHOST_LOG_CONFIG(ERR,
2303                                 "(%s) log offset %#"PRIx64" and log size %#"PRIx64" overflow\n",
2304                                 dev->ifname, off, size);
2305                 goto close_msg_fds;
2306         }
2307
2308         VHOST_LOG_CONFIG(INFO, "(%s) log mmap size: %"PRId64", offset: %"PRId64"\n",
2309                         dev->ifname, size, off);
2310
2311         /*
2312          * mmap from 0 to workaround a hugepage mmap bug: mmap will
2313          * fail when offset is not page size aligned.
2314          */
2315         addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
2316         close(fd);
2317         if (addr == MAP_FAILED) {
2318                 VHOST_LOG_CONFIG(ERR, "(%s) mmap log base failed!\n", dev->ifname);
2319                 return RTE_VHOST_MSG_RESULT_ERR;
2320         }
2321
2322         /*
2323          * Free previously mapped log memory on occasionally
2324          * multiple VHOST_USER_SET_LOG_BASE.
2325          */
2326         if (dev->log_addr) {
2327                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
2328         }
2329         dev->log_addr = (uint64_t)(uintptr_t)addr;
2330         dev->log_base = dev->log_addr + off;
2331         dev->log_size = size;
2332
2333         for (i = 0; i < dev->nr_vring; i++) {
2334                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2335
2336                 rte_free(vq->log_cache);
2337                 vq->log_cache = NULL;
2338                 vq->log_cache_nb_elem = 0;
2339                 vq->log_cache = rte_malloc_socket("vq log cache",
2340                                 sizeof(struct log_cache_entry) * VHOST_LOG_CACHE_NR,
2341                                 0, vq->numa_node);
2342                 /*
2343                  * If log cache alloc fail, don't fail migration, but no
2344                  * caching will be done, which will impact performance
2345                  */
2346                 if (!vq->log_cache)
2347                         VHOST_LOG_CONFIG(ERR, "(%s) failed to allocate VQ logging cache\n",
2348                                         dev->ifname);
2349         }
2350
2351         /*
2352          * The spec is not clear about it (yet), but QEMU doesn't expect
2353          * any payload in the reply.
2354          */
2355         ctx->msg.size = 0;
2356         ctx->fd_num = 0;
2357
2358         return RTE_VHOST_MSG_RESULT_REPLY;
2359
2360 close_msg_fds:
2361         close_msg_fds(ctx);
2362         return RTE_VHOST_MSG_RESULT_ERR;
2363 }
2364
2365 static int vhost_user_set_log_fd(struct virtio_net **pdev,
2366                         struct vhu_msg_context *ctx,
2367                         int main_fd __rte_unused)
2368 {
2369         struct virtio_net *dev = *pdev;
2370
2371         if (validate_msg_fds(dev, ctx, 1) != 0)
2372                 return RTE_VHOST_MSG_RESULT_ERR;
2373
2374         close(ctx->fds[0]);
2375         VHOST_LOG_CONFIG(INFO, "(%s) not implemented.\n", dev->ifname);
2376
2377         return RTE_VHOST_MSG_RESULT_OK;
2378 }
2379
2380 /*
2381  * An rarp packet is constructed and broadcasted to notify switches about
2382  * the new location of the migrated VM, so that packets from outside will
2383  * not be lost after migration.
2384  *
2385  * However, we don't actually "send" a rarp packet here, instead, we set
2386  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
2387  */
2388 static int
2389 vhost_user_send_rarp(struct virtio_net **pdev,
2390                         struct vhu_msg_context *ctx,
2391                         int main_fd __rte_unused)
2392 {
2393         struct virtio_net *dev = *pdev;
2394         uint8_t *mac = (uint8_t *)&ctx->msg.payload.u64;
2395         struct rte_vdpa_device *vdpa_dev;
2396
2397         if (validate_msg_fds(dev, ctx, 0) != 0)
2398                 return RTE_VHOST_MSG_RESULT_ERR;
2399
2400         VHOST_LOG_CONFIG(DEBUG, "(%s) MAC: " RTE_ETHER_ADDR_PRT_FMT "\n",
2401                 dev->ifname, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
2402         memcpy(dev->mac.addr_bytes, mac, 6);
2403
2404         /*
2405          * Set the flag to inject a RARP broadcast packet at
2406          * rte_vhost_dequeue_burst().
2407          *
2408          * __ATOMIC_RELEASE ordering is for making sure the mac is
2409          * copied before the flag is set.
2410          */
2411         __atomic_store_n(&dev->broadcast_rarp, 1, __ATOMIC_RELEASE);
2412         vdpa_dev = dev->vdpa_dev;
2413         if (vdpa_dev && vdpa_dev->ops->migration_done)
2414                 vdpa_dev->ops->migration_done(dev->vid);
2415
2416         return RTE_VHOST_MSG_RESULT_OK;
2417 }
2418
2419 static int
2420 vhost_user_net_set_mtu(struct virtio_net **pdev,
2421                         struct vhu_msg_context *ctx,
2422                         int main_fd __rte_unused)
2423 {
2424         struct virtio_net *dev = *pdev;
2425
2426         if (validate_msg_fds(dev, ctx, 0) != 0)
2427                 return RTE_VHOST_MSG_RESULT_ERR;
2428
2429         if (ctx->msg.payload.u64 < VIRTIO_MIN_MTU ||
2430                         ctx->msg.payload.u64 > VIRTIO_MAX_MTU) {
2431                 VHOST_LOG_CONFIG(ERR, "(%s) invalid MTU size (%"PRIu64")\n",
2432                                 dev->ifname, ctx->msg.payload.u64);
2433
2434                 return RTE_VHOST_MSG_RESULT_ERR;
2435         }
2436
2437         dev->mtu = ctx->msg.payload.u64;
2438
2439         return RTE_VHOST_MSG_RESULT_OK;
2440 }
2441
2442 static int
2443 vhost_user_set_req_fd(struct virtio_net **pdev,
2444                         struct vhu_msg_context *ctx,
2445                         int main_fd __rte_unused)
2446 {
2447         struct virtio_net *dev = *pdev;
2448         int fd = ctx->fds[0];
2449
2450         if (validate_msg_fds(dev, ctx, 1) != 0)
2451                 return RTE_VHOST_MSG_RESULT_ERR;
2452
2453         if (fd < 0) {
2454                 VHOST_LOG_CONFIG(ERR, "(%s) invalid file descriptor for slave channel (%d)\n",
2455                                 dev->ifname, fd);
2456                 return RTE_VHOST_MSG_RESULT_ERR;
2457         }
2458
2459         if (dev->slave_req_fd >= 0)
2460                 close(dev->slave_req_fd);
2461
2462         dev->slave_req_fd = fd;
2463
2464         return RTE_VHOST_MSG_RESULT_OK;
2465 }
2466
2467 static int
2468 is_vring_iotlb_split(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2469 {
2470         struct vhost_vring_addr *ra;
2471         uint64_t start, end, len;
2472
2473         start = imsg->iova;
2474         end = start + imsg->size;
2475
2476         ra = &vq->ring_addrs;
2477         len = sizeof(struct vring_desc) * vq->size;
2478         if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2479                 return 1;
2480
2481         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
2482         if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2483                 return 1;
2484
2485         len = sizeof(struct vring_used) +
2486                sizeof(struct vring_used_elem) * vq->size;
2487         if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2488                 return 1;
2489
2490         if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2491                 len = sizeof(uint64_t);
2492                 if (ra->log_guest_addr < end &&
2493                     (ra->log_guest_addr + len) > start)
2494                         return 1;
2495         }
2496
2497         return 0;
2498 }
2499
2500 static int
2501 is_vring_iotlb_packed(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2502 {
2503         struct vhost_vring_addr *ra;
2504         uint64_t start, end, len;
2505
2506         start = imsg->iova;
2507         end = start + imsg->size;
2508
2509         ra = &vq->ring_addrs;
2510         len = sizeof(struct vring_packed_desc) * vq->size;
2511         if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2512                 return 1;
2513
2514         len = sizeof(struct vring_packed_desc_event);
2515         if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2516                 return 1;
2517
2518         len = sizeof(struct vring_packed_desc_event);
2519         if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2520                 return 1;
2521
2522         if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2523                 len = sizeof(uint64_t);
2524                 if (ra->log_guest_addr < end &&
2525                     (ra->log_guest_addr + len) > start)
2526                         return 1;
2527         }
2528
2529         return 0;
2530 }
2531
2532 static int is_vring_iotlb(struct virtio_net *dev,
2533                           struct vhost_virtqueue *vq,
2534                           struct vhost_iotlb_msg *imsg)
2535 {
2536         if (vq_is_packed(dev))
2537                 return is_vring_iotlb_packed(vq, imsg);
2538         else
2539                 return is_vring_iotlb_split(vq, imsg);
2540 }
2541
2542 static int
2543 vhost_user_iotlb_msg(struct virtio_net **pdev,
2544                         struct vhu_msg_context *ctx,
2545                         int main_fd __rte_unused)
2546 {
2547         struct virtio_net *dev = *pdev;
2548         struct vhost_iotlb_msg *imsg = &ctx->msg.payload.iotlb;
2549         uint16_t i;
2550         uint64_t vva, len;
2551
2552         if (validate_msg_fds(dev, ctx, 0) != 0)
2553                 return RTE_VHOST_MSG_RESULT_ERR;
2554
2555         switch (imsg->type) {
2556         case VHOST_IOTLB_UPDATE:
2557                 len = imsg->size;
2558                 vva = qva_to_vva(dev, imsg->uaddr, &len);
2559                 if (!vva)
2560                         return RTE_VHOST_MSG_RESULT_ERR;
2561
2562                 for (i = 0; i < dev->nr_vring; i++) {
2563                         struct vhost_virtqueue *vq = dev->virtqueue[i];
2564
2565                         if (!vq)
2566                                 continue;
2567
2568                         vhost_user_iotlb_cache_insert(dev, vq, imsg->iova, vva,
2569                                         len, imsg->perm);
2570
2571                         if (is_vring_iotlb(dev, vq, imsg))
2572                                 *pdev = dev = translate_ring_addresses(dev, i);
2573                 }
2574                 break;
2575         case VHOST_IOTLB_INVALIDATE:
2576                 for (i = 0; i < dev->nr_vring; i++) {
2577                         struct vhost_virtqueue *vq = dev->virtqueue[i];
2578
2579                         if (!vq)
2580                                 continue;
2581
2582                         vhost_user_iotlb_cache_remove(vq, imsg->iova,
2583                                         imsg->size);
2584
2585                         if (is_vring_iotlb(dev, vq, imsg))
2586                                 vring_invalidate(dev, vq);
2587                 }
2588                 break;
2589         default:
2590                 VHOST_LOG_CONFIG(ERR, "(%s) invalid IOTLB message type (%d)\n",
2591                                 dev->ifname, imsg->type);
2592                 return RTE_VHOST_MSG_RESULT_ERR;
2593         }
2594
2595         return RTE_VHOST_MSG_RESULT_OK;
2596 }
2597
2598 static int
2599 vhost_user_set_postcopy_advise(struct virtio_net **pdev,
2600                         struct vhu_msg_context *ctx,
2601                         int main_fd __rte_unused)
2602 {
2603         struct virtio_net *dev = *pdev;
2604 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
2605         struct uffdio_api api_struct;
2606
2607         if (validate_msg_fds(dev, ctx, 0) != 0)
2608                 return RTE_VHOST_MSG_RESULT_ERR;
2609
2610         dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
2611
2612         if (dev->postcopy_ufd == -1) {
2613                 VHOST_LOG_CONFIG(ERR, "(%s) userfaultfd not available: %s\n",
2614                         dev->ifname, strerror(errno));
2615                 return RTE_VHOST_MSG_RESULT_ERR;
2616         }
2617         api_struct.api = UFFD_API;
2618         api_struct.features = 0;
2619         if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) {
2620                 VHOST_LOG_CONFIG(ERR, "(%s) UFFDIO_API ioctl failure: %s\n",
2621                         dev->ifname, strerror(errno));
2622                 close(dev->postcopy_ufd);
2623                 dev->postcopy_ufd = -1;
2624                 return RTE_VHOST_MSG_RESULT_ERR;
2625         }
2626         ctx->fds[0] = dev->postcopy_ufd;
2627         ctx->fd_num = 1;
2628
2629         return RTE_VHOST_MSG_RESULT_REPLY;
2630 #else
2631         dev->postcopy_ufd = -1;
2632         ctx->fd_num = 0;
2633
2634         return RTE_VHOST_MSG_RESULT_ERR;
2635 #endif
2636 }
2637
2638 static int
2639 vhost_user_set_postcopy_listen(struct virtio_net **pdev,
2640                         struct vhu_msg_context *ctx __rte_unused,
2641                         int main_fd __rte_unused)
2642 {
2643         struct virtio_net *dev = *pdev;
2644
2645         if (validate_msg_fds(dev, ctx, 0) != 0)
2646                 return RTE_VHOST_MSG_RESULT_ERR;
2647
2648         if (dev->mem && dev->mem->nregions) {
2649                 VHOST_LOG_CONFIG(ERR, "(%s) regions already registered at postcopy-listen\n",
2650                                 dev->ifname);
2651                 return RTE_VHOST_MSG_RESULT_ERR;
2652         }
2653         dev->postcopy_listening = 1;
2654
2655         return RTE_VHOST_MSG_RESULT_OK;
2656 }
2657
2658 static int
2659 vhost_user_postcopy_end(struct virtio_net **pdev,
2660                         struct vhu_msg_context *ctx,
2661                         int main_fd __rte_unused)
2662 {
2663         struct virtio_net *dev = *pdev;
2664
2665         if (validate_msg_fds(dev, ctx, 0) != 0)
2666                 return RTE_VHOST_MSG_RESULT_ERR;
2667
2668         dev->postcopy_listening = 0;
2669         if (dev->postcopy_ufd >= 0) {
2670                 close(dev->postcopy_ufd);
2671                 dev->postcopy_ufd = -1;
2672         }
2673
2674         ctx->msg.payload.u64 = 0;
2675         ctx->msg.size = sizeof(ctx->msg.payload.u64);
2676         ctx->fd_num = 0;
2677
2678         return RTE_VHOST_MSG_RESULT_REPLY;
2679 }
2680
2681 static int
2682 vhost_user_get_status(struct virtio_net **pdev,
2683                       struct vhu_msg_context *ctx,
2684                       int main_fd __rte_unused)
2685 {
2686         struct virtio_net *dev = *pdev;
2687
2688         if (validate_msg_fds(dev, ctx, 0) != 0)
2689                 return RTE_VHOST_MSG_RESULT_ERR;
2690
2691         ctx->msg.payload.u64 = dev->status;
2692         ctx->msg.size = sizeof(ctx->msg.payload.u64);
2693         ctx->fd_num = 0;
2694
2695         return RTE_VHOST_MSG_RESULT_REPLY;
2696 }
2697
2698 static int
2699 vhost_user_set_status(struct virtio_net **pdev,
2700                         struct vhu_msg_context *ctx,
2701                         int main_fd __rte_unused)
2702 {
2703         struct virtio_net *dev = *pdev;
2704
2705         if (validate_msg_fds(dev, ctx, 0) != 0)
2706                 return RTE_VHOST_MSG_RESULT_ERR;
2707
2708         /* As per Virtio specification, the device status is 8bits long */
2709         if (ctx->msg.payload.u64 > UINT8_MAX) {
2710                 VHOST_LOG_CONFIG(ERR, "(%s) invalid VHOST_USER_SET_STATUS payload 0x%" PRIx64 "\n",
2711                                 dev->ifname, ctx->msg.payload.u64);
2712                 return RTE_VHOST_MSG_RESULT_ERR;
2713         }
2714
2715         dev->status = ctx->msg.payload.u64;
2716
2717         if ((dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK) &&
2718             (dev->flags & VIRTIO_DEV_FEATURES_FAILED)) {
2719                 VHOST_LOG_CONFIG(ERR,
2720                                 "(%s) FEATURES_OK bit is set but feature negotiation failed\n",
2721                                 dev->ifname);
2722                 /*
2723                  * Clear the bit to let the driver know about the feature
2724                  * negotiation failure
2725                  */
2726                 dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK;
2727         }
2728
2729         VHOST_LOG_CONFIG(INFO, "(%s) new device status(0x%08x):\n", dev->ifname,
2730                         dev->status);
2731         VHOST_LOG_CONFIG(INFO, "(%s)\t-RESET: %u\n", dev->ifname,
2732                         (dev->status == VIRTIO_DEVICE_STATUS_RESET));
2733         VHOST_LOG_CONFIG(INFO, "(%s)\t-ACKNOWLEDGE: %u\n", dev->ifname,
2734                         !!(dev->status & VIRTIO_DEVICE_STATUS_ACK));
2735         VHOST_LOG_CONFIG(INFO, "(%s)\t-DRIVER: %u\n", dev->ifname,
2736                         !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER));
2737         VHOST_LOG_CONFIG(INFO, "(%s)\t-FEATURES_OK: %u\n", dev->ifname,
2738                         !!(dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK));
2739         VHOST_LOG_CONFIG(INFO, "(%s)\t-DRIVER_OK: %u\n", dev->ifname,
2740                         !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK));
2741         VHOST_LOG_CONFIG(INFO, "(%s)\t-DEVICE_NEED_RESET: %u\n", dev->ifname,
2742                         !!(dev->status & VIRTIO_DEVICE_STATUS_DEV_NEED_RESET));
2743         VHOST_LOG_CONFIG(INFO, "(%s)\t-FAILED: %u\n", dev->ifname,
2744                         !!(dev->status & VIRTIO_DEVICE_STATUS_FAILED));
2745
2746         return RTE_VHOST_MSG_RESULT_OK;
2747 }
2748
2749 typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
2750                                         struct vhu_msg_context *ctx,
2751                                         int main_fd);
2752
2753 static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = {
2754         [VHOST_USER_NONE] = NULL,
2755         [VHOST_USER_GET_FEATURES] = vhost_user_get_features,
2756         [VHOST_USER_SET_FEATURES] = vhost_user_set_features,
2757         [VHOST_USER_SET_OWNER] = vhost_user_set_owner,
2758         [VHOST_USER_RESET_OWNER] = vhost_user_reset_owner,
2759         [VHOST_USER_SET_MEM_TABLE] = vhost_user_set_mem_table,
2760         [VHOST_USER_SET_LOG_BASE] = vhost_user_set_log_base,
2761         [VHOST_USER_SET_LOG_FD] = vhost_user_set_log_fd,
2762         [VHOST_USER_SET_VRING_NUM] = vhost_user_set_vring_num,
2763         [VHOST_USER_SET_VRING_ADDR] = vhost_user_set_vring_addr,
2764         [VHOST_USER_SET_VRING_BASE] = vhost_user_set_vring_base,
2765         [VHOST_USER_GET_VRING_BASE] = vhost_user_get_vring_base,
2766         [VHOST_USER_SET_VRING_KICK] = vhost_user_set_vring_kick,
2767         [VHOST_USER_SET_VRING_CALL] = vhost_user_set_vring_call,
2768         [VHOST_USER_SET_VRING_ERR] = vhost_user_set_vring_err,
2769         [VHOST_USER_GET_PROTOCOL_FEATURES] = vhost_user_get_protocol_features,
2770         [VHOST_USER_SET_PROTOCOL_FEATURES] = vhost_user_set_protocol_features,
2771         [VHOST_USER_GET_QUEUE_NUM] = vhost_user_get_queue_num,
2772         [VHOST_USER_SET_VRING_ENABLE] = vhost_user_set_vring_enable,
2773         [VHOST_USER_SEND_RARP] = vhost_user_send_rarp,
2774         [VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
2775         [VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
2776         [VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
2777         [VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
2778         [VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
2779         [VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
2780         [VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd,
2781         [VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd,
2782         [VHOST_USER_SET_STATUS] = vhost_user_set_status,
2783         [VHOST_USER_GET_STATUS] = vhost_user_get_status,
2784 };
2785
2786 /* return bytes# of read on success or negative val on failure. */
2787 static int
2788 read_vhost_message(struct virtio_net *dev, int sockfd, struct  vhu_msg_context *ctx)
2789 {
2790         int ret;
2791
2792         ret = read_fd_message(dev->ifname, sockfd, (char *)&ctx->msg, VHOST_USER_HDR_SIZE,
2793                 ctx->fds, VHOST_MEMORY_MAX_NREGIONS, &ctx->fd_num);
2794         if (ret <= 0) {
2795                 return ret;
2796         } else if (ret != VHOST_USER_HDR_SIZE) {
2797                 VHOST_LOG_CONFIG(ERR, "(%s) Unexpected header size read\n", dev->ifname);
2798                 close_msg_fds(ctx);
2799                 return -1;
2800         }
2801
2802         if (ctx->msg.size) {
2803                 if (ctx->msg.size > sizeof(ctx->msg.payload)) {
2804                         VHOST_LOG_CONFIG(ERR, "(%s) invalid msg size: %d\n",
2805                                         dev->ifname, ctx->msg.size);
2806                         return -1;
2807                 }
2808                 ret = read(sockfd, &ctx->msg.payload, ctx->msg.size);
2809                 if (ret <= 0)
2810                         return ret;
2811                 if (ret != (int)ctx->msg.size) {
2812                         VHOST_LOG_CONFIG(ERR, "(%s) read control message failed\n", dev->ifname);
2813                         return -1;
2814                 }
2815         }
2816
2817         return ret;
2818 }
2819
2820 static int
2821 send_vhost_message(struct virtio_net *dev, int sockfd, struct vhu_msg_context *ctx)
2822 {
2823         if (!ctx)
2824                 return 0;
2825
2826         return send_fd_message(dev->ifname, sockfd, (char *)&ctx->msg,
2827                 VHOST_USER_HDR_SIZE + ctx->msg.size, ctx->fds, ctx->fd_num);
2828 }
2829
2830 static int
2831 send_vhost_reply(struct virtio_net *dev, int sockfd, struct vhu_msg_context *ctx)
2832 {
2833         if (!ctx)
2834                 return 0;
2835
2836         ctx->msg.flags &= ~VHOST_USER_VERSION_MASK;
2837         ctx->msg.flags &= ~VHOST_USER_NEED_REPLY;
2838         ctx->msg.flags |= VHOST_USER_VERSION;
2839         ctx->msg.flags |= VHOST_USER_REPLY_MASK;
2840
2841         return send_vhost_message(dev, sockfd, ctx);
2842 }
2843
2844 static int
2845 send_vhost_slave_message(struct virtio_net *dev,
2846                 struct vhu_msg_context *ctx)
2847 {
2848         int ret;
2849
2850         if (ctx->msg.flags & VHOST_USER_NEED_REPLY)
2851                 rte_spinlock_lock(&dev->slave_req_lock);
2852
2853         ret = send_vhost_message(dev, dev->slave_req_fd, ctx);
2854         if (ret < 0 && (ctx->msg.flags & VHOST_USER_NEED_REPLY))
2855                 rte_spinlock_unlock(&dev->slave_req_lock);
2856
2857         return ret;
2858 }
2859
2860 /*
2861  * Allocate a queue pair if it hasn't been allocated yet
2862  */
2863 static int
2864 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
2865                         struct vhu_msg_context *ctx)
2866 {
2867         uint32_t vring_idx;
2868
2869         switch (ctx->msg.request.master) {
2870         case VHOST_USER_SET_VRING_KICK:
2871         case VHOST_USER_SET_VRING_CALL:
2872         case VHOST_USER_SET_VRING_ERR:
2873                 vring_idx = ctx->msg.payload.u64 & VHOST_USER_VRING_IDX_MASK;
2874                 break;
2875         case VHOST_USER_SET_VRING_NUM:
2876         case VHOST_USER_SET_VRING_BASE:
2877         case VHOST_USER_GET_VRING_BASE:
2878         case VHOST_USER_SET_VRING_ENABLE:
2879                 vring_idx = ctx->msg.payload.state.index;
2880                 break;
2881         case VHOST_USER_SET_VRING_ADDR:
2882                 vring_idx = ctx->msg.payload.addr.index;
2883                 break;
2884         default:
2885                 return 0;
2886         }
2887
2888         if (vring_idx >= VHOST_MAX_VRING) {
2889                 VHOST_LOG_CONFIG(ERR, "(%s) invalid vring index: %u\n", dev->ifname, vring_idx);
2890                 return -1;
2891         }
2892
2893         if (dev->virtqueue[vring_idx])
2894                 return 0;
2895
2896         return alloc_vring_queue(dev, vring_idx);
2897 }
2898
2899 static void
2900 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
2901 {
2902         unsigned int i = 0;
2903         unsigned int vq_num = 0;
2904
2905         while (vq_num < dev->nr_vring) {
2906                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2907
2908                 if (vq) {
2909                         rte_spinlock_lock(&vq->access_lock);
2910                         vq_num++;
2911                 }
2912                 i++;
2913         }
2914 }
2915
2916 static void
2917 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
2918 {
2919         unsigned int i = 0;
2920         unsigned int vq_num = 0;
2921
2922         while (vq_num < dev->nr_vring) {
2923                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2924
2925                 if (vq) {
2926                         rte_spinlock_unlock(&vq->access_lock);
2927                         vq_num++;
2928                 }
2929                 i++;
2930         }
2931 }
2932
2933 int
2934 vhost_user_msg_handler(int vid, int fd)
2935 {
2936         struct virtio_net *dev;
2937         struct vhu_msg_context ctx;
2938         struct rte_vdpa_device *vdpa_dev;
2939         int ret;
2940         int unlock_required = 0;
2941         bool handled;
2942         int request;
2943         uint32_t i;
2944
2945         dev = get_device(vid);
2946         if (dev == NULL)
2947                 return -1;
2948
2949         if (!dev->notify_ops) {
2950                 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
2951                 if (!dev->notify_ops) {
2952                         VHOST_LOG_CONFIG(ERR, "(%s) failed to get callback ops for driver\n",
2953                                 dev->ifname);
2954                         return -1;
2955                 }
2956         }
2957
2958         ret = read_vhost_message(dev, fd, &ctx);
2959         if (ret <= 0) {
2960                 if (ret < 0)
2961                         VHOST_LOG_CONFIG(ERR, "(%s) vhost read message failed\n", dev->ifname);
2962                 else
2963                         VHOST_LOG_CONFIG(INFO, "(%s) vhost peer closed\n", dev->ifname);
2964
2965                 return -1;
2966         }
2967
2968         ret = 0;
2969         request = ctx.msg.request.master;
2970         if (request > VHOST_USER_NONE && request < VHOST_USER_MAX &&
2971                         vhost_message_str[request]) {
2972                 if (request != VHOST_USER_IOTLB_MSG)
2973                         VHOST_LOG_CONFIG(INFO, "(%s) read message %s\n",
2974                                 dev->ifname, vhost_message_str[request]);
2975                 else
2976                         VHOST_LOG_CONFIG(DEBUG, "(%s) read message %s\n",
2977                                 dev->ifname, vhost_message_str[request]);
2978         } else {
2979                 VHOST_LOG_CONFIG(DEBUG, "(%s) external request %d\n", dev->ifname, request);
2980         }
2981
2982         ret = vhost_user_check_and_alloc_queue_pair(dev, &ctx);
2983         if (ret < 0) {
2984                 VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc queue\n", dev->ifname);
2985                 return -1;
2986         }
2987
2988         /*
2989          * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
2990          * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
2991          * and device is destroyed. destroy_device waits for queues to be
2992          * inactive, so it is safe. Otherwise taking the access_lock
2993          * would cause a dead lock.
2994          */
2995         switch (request) {
2996         case VHOST_USER_SET_FEATURES:
2997         case VHOST_USER_SET_PROTOCOL_FEATURES:
2998         case VHOST_USER_SET_OWNER:
2999         case VHOST_USER_SET_MEM_TABLE:
3000         case VHOST_USER_SET_LOG_BASE:
3001         case VHOST_USER_SET_LOG_FD:
3002         case VHOST_USER_SET_VRING_NUM:
3003         case VHOST_USER_SET_VRING_ADDR:
3004         case VHOST_USER_SET_VRING_BASE:
3005         case VHOST_USER_SET_VRING_KICK:
3006         case VHOST_USER_SET_VRING_CALL:
3007         case VHOST_USER_SET_VRING_ERR:
3008         case VHOST_USER_SET_VRING_ENABLE:
3009         case VHOST_USER_SEND_RARP:
3010         case VHOST_USER_NET_SET_MTU:
3011         case VHOST_USER_SET_SLAVE_REQ_FD:
3012                 if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
3013                         vhost_user_lock_all_queue_pairs(dev);
3014                         unlock_required = 1;
3015                 }
3016                 break;
3017         default:
3018                 break;
3019
3020         }
3021
3022         handled = false;
3023         if (dev->extern_ops.pre_msg_handle) {
3024                 ret = (*dev->extern_ops.pre_msg_handle)(dev->vid,
3025                                 (void *)&ctx.msg);
3026                 switch (ret) {
3027                 case RTE_VHOST_MSG_RESULT_REPLY:
3028                         send_vhost_reply(dev, fd, &ctx);
3029                         /* Fall-through */
3030                 case RTE_VHOST_MSG_RESULT_ERR:
3031                 case RTE_VHOST_MSG_RESULT_OK:
3032                         handled = true;
3033                         goto skip_to_post_handle;
3034                 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
3035                 default:
3036                         break;
3037                 }
3038         }
3039
3040         if (request > VHOST_USER_NONE && request < VHOST_USER_MAX) {
3041                 if (!vhost_message_handlers[request])
3042                         goto skip_to_post_handle;
3043                 ret = vhost_message_handlers[request](&dev, &ctx, fd);
3044
3045                 switch (ret) {
3046                 case RTE_VHOST_MSG_RESULT_ERR:
3047                         VHOST_LOG_CONFIG(ERR, "(%s) processing %s failed.\n",
3048                                         dev->ifname, vhost_message_str[request]);
3049                         handled = true;
3050                         break;
3051                 case RTE_VHOST_MSG_RESULT_OK:
3052                         VHOST_LOG_CONFIG(DEBUG, "(%s) processing %s succeeded.\n",
3053                                         dev->ifname, vhost_message_str[request]);
3054                         handled = true;
3055                         break;
3056                 case RTE_VHOST_MSG_RESULT_REPLY:
3057                         VHOST_LOG_CONFIG(DEBUG, "(%s) processing %s succeeded and needs reply.\n",
3058                                         dev->ifname, vhost_message_str[request]);
3059                         send_vhost_reply(dev, fd, &ctx);
3060                         handled = true;
3061                         break;
3062                 default:
3063                         break;
3064                 }
3065         }
3066
3067 skip_to_post_handle:
3068         if (ret != RTE_VHOST_MSG_RESULT_ERR &&
3069                         dev->extern_ops.post_msg_handle) {
3070                 ret = (*dev->extern_ops.post_msg_handle)(dev->vid,
3071                                 (void *)&ctx.msg);
3072                 switch (ret) {
3073                 case RTE_VHOST_MSG_RESULT_REPLY:
3074                         send_vhost_reply(dev, fd, &ctx);
3075                         /* Fall-through */
3076                 case RTE_VHOST_MSG_RESULT_ERR:
3077                 case RTE_VHOST_MSG_RESULT_OK:
3078                         handled = true;
3079                 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
3080                 default:
3081                         break;
3082                 }
3083         }
3084
3085         /* If message was not handled at this stage, treat it as an error */
3086         if (!handled) {
3087                 VHOST_LOG_CONFIG(ERR, "(%s) vhost message (req: %d) was not handled.\n",
3088                                 dev->ifname, request);
3089                 close_msg_fds(&ctx);
3090                 ret = RTE_VHOST_MSG_RESULT_ERR;
3091         }
3092
3093         /*
3094          * If the request required a reply that was already sent,
3095          * this optional reply-ack won't be sent as the
3096          * VHOST_USER_NEED_REPLY was cleared in send_vhost_reply().
3097          */
3098         if (ctx.msg.flags & VHOST_USER_NEED_REPLY) {
3099                 ctx.msg.payload.u64 = ret == RTE_VHOST_MSG_RESULT_ERR;
3100                 ctx.msg.size = sizeof(ctx.msg.payload.u64);
3101                 ctx.fd_num = 0;
3102                 send_vhost_reply(dev, fd, &ctx);
3103         } else if (ret == RTE_VHOST_MSG_RESULT_ERR) {
3104                 VHOST_LOG_CONFIG(ERR, "(%s) vhost message handling failed.\n", dev->ifname);
3105                 return -1;
3106         }
3107
3108         for (i = 0; i < dev->nr_vring; i++) {
3109                 struct vhost_virtqueue *vq = dev->virtqueue[i];
3110                 bool cur_ready = vq_is_ready(dev, vq);
3111
3112                 if (cur_ready != (vq && vq->ready)) {
3113                         vq->ready = cur_ready;
3114                         vhost_user_notify_queue_state(dev, i, cur_ready);
3115                 }
3116         }
3117
3118         if (unlock_required)
3119                 vhost_user_unlock_all_queue_pairs(dev);
3120
3121         if (!virtio_is_ready(dev))
3122                 goto out;
3123
3124         /*
3125          * Virtio is now ready. If not done already, it is time
3126          * to notify the application it can process the rings and
3127          * configure the vDPA device if present.
3128          */
3129
3130         if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
3131                 if (dev->notify_ops->new_device(dev->vid) == 0)
3132                         dev->flags |= VIRTIO_DEV_RUNNING;
3133         }
3134
3135         vdpa_dev = dev->vdpa_dev;
3136         if (!vdpa_dev)
3137                 goto out;
3138
3139         if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
3140                 if (vdpa_dev->ops->dev_conf(dev->vid))
3141                         VHOST_LOG_CONFIG(ERR, "(%s) failed to configure vDPA device\n",
3142                                         dev->ifname);
3143                 else
3144                         dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
3145         }
3146
3147 out:
3148         return 0;
3149 }
3150
3151 static int process_slave_message_reply(struct virtio_net *dev,
3152                                        const struct vhu_msg_context *ctx)
3153 {
3154         struct vhu_msg_context msg_reply;
3155         int ret;
3156
3157         if ((ctx->msg.flags & VHOST_USER_NEED_REPLY) == 0)
3158                 return 0;
3159
3160         ret = read_vhost_message(dev, dev->slave_req_fd, &msg_reply);
3161         if (ret <= 0) {
3162                 if (ret < 0)
3163                         VHOST_LOG_CONFIG(ERR, "(%s) vhost read slave message reply failed\n",
3164                                         dev->ifname);
3165                 else
3166                         VHOST_LOG_CONFIG(INFO, "(%s) vhost peer closed\n", dev->ifname);
3167                 ret = -1;
3168                 goto out;
3169         }
3170
3171         ret = 0;
3172         if (msg_reply.msg.request.slave != ctx->msg.request.slave) {
3173                 VHOST_LOG_CONFIG(ERR, "(%s) received unexpected msg type (%u), expected %u\n",
3174                                 dev->ifname, msg_reply.msg.request.slave, ctx->msg.request.slave);
3175                 ret = -1;
3176                 goto out;
3177         }
3178
3179         ret = msg_reply.msg.payload.u64 ? -1 : 0;
3180
3181 out:
3182         rte_spinlock_unlock(&dev->slave_req_lock);
3183         return ret;
3184 }
3185
3186 int
3187 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
3188 {
3189         int ret;
3190         struct vhu_msg_context ctx = {
3191                 .msg = {
3192                         .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
3193                         .flags = VHOST_USER_VERSION,
3194                         .size = sizeof(ctx.msg.payload.iotlb),
3195                         .payload.iotlb = {
3196                                 .iova = iova,
3197                                 .perm = perm,
3198                                 .type = VHOST_IOTLB_MISS,
3199                         },
3200                 },
3201         };
3202
3203         ret = send_vhost_message(dev, dev->slave_req_fd, &ctx);
3204         if (ret < 0) {
3205                 VHOST_LOG_CONFIG(ERR, "(%s) failed to send IOTLB miss message (%d)\n",
3206                                 dev->ifname, ret);
3207                 return ret;
3208         }
3209
3210         return 0;
3211 }
3212
3213 static int
3214 vhost_user_slave_config_change(struct virtio_net *dev, bool need_reply)
3215 {
3216         int ret;
3217         struct vhu_msg_context ctx = {
3218                 .msg = {
3219                         .request.slave = VHOST_USER_SLAVE_CONFIG_CHANGE_MSG,
3220                         .flags = VHOST_USER_VERSION,
3221                         .size = 0,
3222                 }
3223         };
3224
3225         if (need_reply)
3226                 ctx.msg.flags |= VHOST_USER_NEED_REPLY;
3227
3228         ret = send_vhost_slave_message(dev, &ctx);
3229         if (ret < 0) {
3230                 VHOST_LOG_CONFIG(ERR, "(%s) failed to send config change (%d)\n",
3231                                 dev->ifname, ret);
3232                 return ret;
3233         }
3234
3235         return process_slave_message_reply(dev, &ctx);
3236 }
3237
3238 int
3239 rte_vhost_slave_config_change(int vid, bool need_reply)
3240 {
3241         struct virtio_net *dev;
3242
3243         dev = get_device(vid);
3244         if (!dev)
3245                 return -ENODEV;
3246
3247         return vhost_user_slave_config_change(dev, need_reply);
3248 }
3249
3250 static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev,
3251                                                     int index, int fd,
3252                                                     uint64_t offset,
3253                                                     uint64_t size)
3254 {
3255         int ret;
3256         struct vhu_msg_context ctx = {
3257                 .msg = {
3258                         .request.slave = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
3259                         .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY,
3260                         .size = sizeof(ctx.msg.payload.area),
3261                         .payload.area = {
3262                                 .u64 = index & VHOST_USER_VRING_IDX_MASK,
3263                                 .size = size,
3264                                 .offset = offset,
3265                         },
3266                 },
3267         };
3268
3269         if (fd < 0)
3270                 ctx.msg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK;
3271         else {
3272                 ctx.fds[0] = fd;
3273                 ctx.fd_num = 1;
3274         }
3275
3276         ret = send_vhost_slave_message(dev, &ctx);
3277         if (ret < 0) {
3278                 VHOST_LOG_CONFIG(ERR, "(%s) failed to set host notifier (%d)\n",
3279                                 dev->ifname, ret);
3280                 return ret;
3281         }
3282
3283         return process_slave_message_reply(dev, &ctx);
3284 }
3285
3286 int rte_vhost_host_notifier_ctrl(int vid, uint16_t qid, bool enable)
3287 {
3288         struct virtio_net *dev;
3289         struct rte_vdpa_device *vdpa_dev;
3290         int vfio_device_fd, ret = 0;
3291         uint64_t offset, size;
3292         unsigned int i, q_start, q_last;
3293
3294         dev = get_device(vid);
3295         if (!dev)
3296                 return -ENODEV;
3297
3298         vdpa_dev = dev->vdpa_dev;
3299         if (vdpa_dev == NULL)
3300                 return -ENODEV;
3301
3302         if (!(dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
3303             !(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) ||
3304             !(dev->protocol_features &
3305                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ)) ||
3306             !(dev->protocol_features &
3307                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) ||
3308             !(dev->protocol_features &
3309                         (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER)))
3310                 return -ENOTSUP;
3311
3312         if (qid == RTE_VHOST_QUEUE_ALL) {
3313                 q_start = 0;
3314                 q_last = dev->nr_vring - 1;
3315         } else {
3316                 if (qid >= dev->nr_vring)
3317                         return -EINVAL;
3318                 q_start = qid;
3319                 q_last = qid;
3320         }
3321
3322         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP);
3323         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP);
3324
3325         vfio_device_fd = vdpa_dev->ops->get_vfio_device_fd(vid);
3326         if (vfio_device_fd < 0)
3327                 return -ENOTSUP;
3328
3329         if (enable) {
3330                 for (i = q_start; i <= q_last; i++) {
3331                         if (vdpa_dev->ops->get_notify_area(vid, i, &offset,
3332                                         &size) < 0) {
3333                                 ret = -ENOTSUP;
3334                                 goto disable;
3335                         }
3336
3337                         if (vhost_user_slave_set_vring_host_notifier(dev, i,
3338                                         vfio_device_fd, offset, size) < 0) {
3339                                 ret = -EFAULT;
3340                                 goto disable;
3341                         }
3342                 }
3343         } else {
3344 disable:
3345                 for (i = q_start; i <= q_last; i++) {
3346                         vhost_user_slave_set_vring_host_notifier(dev, i, -1,
3347                                         0, 0);
3348                 }
3349         }
3350
3351         return ret;
3352 }