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         struct rte_vdpa_device *vdpa_dev;
 223
 224         vdpa_dev = dev->vdpa_dev;
 225         if (vdpa_dev && vdpa_dev->ops->dev_cleanup != NULL)
 226                 vdpa_dev->ops->dev_cleanup(dev->vid);
 227
 228         if (dev->mem) {
 229                 free_mem_region(dev);
 230                 rte_free(dev->mem);
 231                 dev->mem = NULL;
 232         }
 233
 234         rte_free(dev->guest_pages);
 235         dev->guest_pages = NULL;
 236
 237         if (dev->log_addr) {
 238                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 239                 dev->log_addr = 0;
 240         }
 241
 242         if (dev->inflight_info) {
 243                 if (dev->inflight_info->addr) {
 244                         munmap(dev->inflight_info->addr,
 245                                dev->inflight_info->size);
 246                         dev->inflight_info->addr = NULL;
 247                 }
 248
 249                 if (dev->inflight_info->fd >= 0) {
 250                         close(dev->inflight_info->fd);
 251                         dev->inflight_info->fd = -1;
 252                 }
 253
 254                 rte_free(dev->inflight_info);
 255                 dev->inflight_info = NULL;
 256         }
 257
 258         if (dev->slave_req_fd >= 0) {
 259                 close(dev->slave_req_fd);
 260                 dev->slave_req_fd = -1;
 261         }
 262
 263         if (dev->postcopy_ufd >= 0) {
 264                 close(dev->postcopy_ufd);
 265                 dev->postcopy_ufd = -1;
 266         }
 267
 268         dev->postcopy_listening = 0;
 269 }
 270
 271 static void
 272 vhost_user_notify_queue_state(struct virtio_net *dev, uint16_t index,
 273                               int enable)
 274 {
 275         struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
 276         struct vhost_virtqueue *vq = dev->virtqueue[index];
 277
 278         /* Configure guest notifications on enable */
 279         if (enable && vq->notif_enable != VIRTIO_UNINITIALIZED_NOTIF)
 280                 vhost_enable_guest_notification(dev, vq, vq->notif_enable);
 281
 282         if (vdpa_dev && vdpa_dev->ops->set_vring_state)
 283                 vdpa_dev->ops->set_vring_state(dev->vid, index, enable);
 284
 285         if (dev->notify_ops->vring_state_changed)
 286                 dev->notify_ops->vring_state_changed(dev->vid,
 287                                 index, enable);
 288 }
 289
 290 /*
 291  * This function just returns success at the moment unless
 292  * the device hasn't been initialised.
 293  */
 294 static int
 295 vhost_user_set_owner(struct virtio_net **pdev,
 296                         struct vhu_msg_context *ctx,
 297                         int main_fd __rte_unused)
 298 {
 299         struct virtio_net *dev = *pdev;
 300
 301         if (validate_msg_fds(dev, ctx, 0) != 0)
 302                 return RTE_VHOST_MSG_RESULT_ERR;
 303
 304         return RTE_VHOST_MSG_RESULT_OK;
 305 }
 306
 307 static int
 308 vhost_user_reset_owner(struct virtio_net **pdev,
 309                         struct vhu_msg_context *ctx,
 310                         int main_fd __rte_unused)
 311 {
 312         struct virtio_net *dev = *pdev;
 313
 314         if (validate_msg_fds(dev, ctx, 0) != 0)
 315                 return RTE_VHOST_MSG_RESULT_ERR;
 316
 317         vhost_destroy_device_notify(dev);
 318
 319         cleanup_device(dev, 0);
 320         reset_device(dev);
 321         return RTE_VHOST_MSG_RESULT_OK;
 322 }
 323
 324 /*
 325  * The features that we support are requested.
 326  */
 327 static int
 328 vhost_user_get_features(struct virtio_net **pdev,
 329                         struct vhu_msg_context *ctx,
 330                         int main_fd __rte_unused)
 331 {
 332         struct virtio_net *dev = *pdev;
 333         uint64_t features = 0;
 334
 335         if (validate_msg_fds(dev, ctx, 0) != 0)
 336                 return RTE_VHOST_MSG_RESULT_ERR;
 337
 338         rte_vhost_driver_get_features(dev->ifname, &features);
 339
 340         ctx->msg.payload.u64 = features;
 341         ctx->msg.size = sizeof(ctx->msg.payload.u64);
 342         ctx->fd_num = 0;
 343
 344         return RTE_VHOST_MSG_RESULT_REPLY;
 345 }
 346
 347 /*
 348  * The queue number that we support are requested.
 349  */
 350 static int
 351 vhost_user_get_queue_num(struct virtio_net **pdev,
 352                         struct vhu_msg_context *ctx,
 353                         int main_fd __rte_unused)
 354 {
 355         struct virtio_net *dev = *pdev;
 356         uint32_t queue_num = 0;
 357
 358         if (validate_msg_fds(dev, ctx, 0) != 0)
 359                 return RTE_VHOST_MSG_RESULT_ERR;
 360
 361         rte_vhost_driver_get_queue_num(dev->ifname, &queue_num);
 362
 363         ctx->msg.payload.u64 = (uint64_t)queue_num;
 364         ctx->msg.size = sizeof(ctx->msg.payload.u64);
 365         ctx->fd_num = 0;
 366
 367         return RTE_VHOST_MSG_RESULT_REPLY;
 368 }
 369
 370 /*
 371  * We receive the negotiated features supported by us and the virtio device.
 372  */
 373 static int
 374 vhost_user_set_features(struct virtio_net **pdev,
 375                         struct vhu_msg_context *ctx,
 376                         int main_fd __rte_unused)
 377 {
 378         struct virtio_net *dev = *pdev;
 379         uint64_t features = ctx->msg.payload.u64;
 380         uint64_t vhost_features = 0;
 381         struct rte_vdpa_device *vdpa_dev;
 382
 383         if (validate_msg_fds(dev, ctx, 0) != 0)
 384                 return RTE_VHOST_MSG_RESULT_ERR;
 385
 386         rte_vhost_driver_get_features(dev->ifname, &vhost_features);
 387         if (features & ~vhost_features) {
 388                 VHOST_LOG_CONFIG(ERR, "(%s) received invalid negotiated features.\n",
 389                         dev->ifname);
 390                 dev->flags |= VIRTIO_DEV_FEATURES_FAILED;
 391                 dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK;
 392
 393                 return RTE_VHOST_MSG_RESULT_ERR;
 394         }
 395
 396         if (dev->flags & VIRTIO_DEV_RUNNING) {
 397                 if (dev->features == features)
 398                         return RTE_VHOST_MSG_RESULT_OK;
 399
 400                 /*
 401                  * Error out if master tries to change features while device is
 402                  * in running state. The exception being VHOST_F_LOG_ALL, which
 403                  * is enabled when the live-migration starts.
 404                  */
 405                 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) {
 406                         VHOST_LOG_CONFIG(ERR, "(%s) features changed while device is running.\n",
 407                                 dev->ifname);
 408                         return RTE_VHOST_MSG_RESULT_ERR;
 409                 }
 410
 411                 if (dev->notify_ops->features_changed)
 412                         dev->notify_ops->features_changed(dev->vid, features);
 413         }
 414
 415         dev->features = features;
 416         if (dev->features &
 417                 ((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
 418                  (1ULL << VIRTIO_F_VERSION_1) |
 419                  (1ULL << VIRTIO_F_RING_PACKED))) {
 420                 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 421         } else {
 422                 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
 423         }
 424         VHOST_LOG_CONFIG(INFO, "(%s) negotiated Virtio features: 0x%" PRIx64 "\n",
 425                         dev->ifname, dev->features);
 426         VHOST_LOG_CONFIG(DEBUG, "(%s) mergeable RX buffers %s, virtio 1 %s\n",
 427                 dev->ifname,
 428                 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
 429                 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 430
 431         if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
 432             !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
 433                 /*
 434                  * Remove all but first queue pair if MQ hasn't been
 435                  * negotiated. This is safe because the device is not
 436                  * running at this stage.
 437                  */
 438                 while (dev->nr_vring > 2) {
 439                         struct vhost_virtqueue *vq;
 440
 441                         vq = dev->virtqueue[--dev->nr_vring];
 442                         if (!vq)
 443                                 continue;
 444
 445                         dev->virtqueue[dev->nr_vring] = NULL;
 446                         cleanup_vq(vq, 1);
 447                         cleanup_vq_inflight(dev, vq);
 448                         free_vq(dev, vq);
 449                 }
 450         }
 451
 452         vdpa_dev = dev->vdpa_dev;
 453         if (vdpa_dev)
 454                 vdpa_dev->ops->set_features(dev->vid);
 455
 456         dev->flags &= ~VIRTIO_DEV_FEATURES_FAILED;
 457         return RTE_VHOST_MSG_RESULT_OK;
 458 }
 459
 460 /*
 461  * The virtio device sends us the size of the descriptor ring.
 462  */
 463 static int
 464 vhost_user_set_vring_num(struct virtio_net **pdev,
 465                         struct vhu_msg_context *ctx,
 466                         int main_fd __rte_unused)
 467 {
 468         struct virtio_net *dev = *pdev;
 469         struct vhost_virtqueue *vq = dev->virtqueue[ctx->msg.payload.state.index];
 470
 471         if (validate_msg_fds(dev, ctx, 0) != 0)
 472                 return RTE_VHOST_MSG_RESULT_ERR;
 473
 474         if (ctx->msg.payload.state.num > 32768) {
 475                 VHOST_LOG_CONFIG(ERR, "(%s) invalid virtqueue size %u\n",
 476                                 dev->ifname, ctx->msg.payload.state.num);
 477                 return RTE_VHOST_MSG_RESULT_ERR;
 478         }
 479
 480         vq->size = ctx->msg.payload.state.num;
 481
 482         /* VIRTIO 1.0, 2.4 Virtqueues says:
 483          *
 484          *   Queue Size value is always a power of 2. The maximum Queue Size
 485          *   value is 32768.
 486          *
 487          * VIRTIO 1.1 2.7 Virtqueues says:
 488          *
 489          *   Packed virtqueues support up to 2^15 entries each.
 490          */
 491         if (!vq_is_packed(dev)) {
 492                 if (vq->size & (vq->size - 1)) {
 493                         VHOST_LOG_CONFIG(ERR, "(%s) invalid virtqueue size %u\n",
 494                                         dev->ifname, vq->size);
 495                         return RTE_VHOST_MSG_RESULT_ERR;
 496                 }
 497         }
 498
 499         if (vq_is_packed(dev)) {
 500                 rte_free(vq->shadow_used_packed);
 501                 vq->shadow_used_packed = rte_malloc_socket(NULL,
 502                                 vq->size *
 503                                 sizeof(struct vring_used_elem_packed),
 504                                 RTE_CACHE_LINE_SIZE, vq->numa_node);
 505                 if (!vq->shadow_used_packed) {
 506                         VHOST_LOG_CONFIG(ERR,
 507                                 "(%s) failed to allocate memory for shadow used ring.\n",
 508                                 dev->ifname);
 509                         return RTE_VHOST_MSG_RESULT_ERR;
 510                 }
 511
 512         } else {
 513                 rte_free(vq->shadow_used_split);
 514
 515                 vq->shadow_used_split = rte_malloc_socket(NULL,
 516                                 vq->size * sizeof(struct vring_used_elem),
 517                                 RTE_CACHE_LINE_SIZE, vq->numa_node);
 518
 519                 if (!vq->shadow_used_split) {
 520                         VHOST_LOG_CONFIG(ERR,
 521                                 "(%s) failed to allocate memory for vq internal data.\n",
 522                                 dev->ifname);
 523                         return RTE_VHOST_MSG_RESULT_ERR;
 524                 }
 525         }
 526
 527         rte_free(vq->batch_copy_elems);
 528         vq->batch_copy_elems = rte_malloc_socket(NULL,
 529                                 vq->size * sizeof(struct batch_copy_elem),
 530                                 RTE_CACHE_LINE_SIZE, vq->numa_node);
 531         if (!vq->batch_copy_elems) {
 532                 VHOST_LOG_CONFIG(ERR, "(%s) failed to allocate memory for batching copy.\n",
 533                         dev->ifname);
 534                 return RTE_VHOST_MSG_RESULT_ERR;
 535         }
 536
 537         return RTE_VHOST_MSG_RESULT_OK;
 538 }
 539
 540 /*
 541  * Reallocate virtio_dev, vhost_virtqueue and related data structures to
 542  * make them on the same numa node as the memory of vring descriptor.
 543  */
 544 #ifdef RTE_LIBRTE_VHOST_NUMA
 545 static struct virtio_net*
 546 numa_realloc(struct virtio_net *dev, int index)
 547 {
 548         int node, dev_node;
 549         struct virtio_net *old_dev;
 550         struct vhost_virtqueue *vq;
 551         struct batch_copy_elem *bce;
 552         struct guest_page *gp;
 553         struct rte_vhost_memory *mem;
 554         size_t mem_size;
 555         int ret;
 556
 557         old_dev = dev;
 558         vq = dev->virtqueue[index];
 559
 560         /*
 561          * If VQ is ready, it is too late to reallocate, it certainly already
 562          * happened anyway on VHOST_USER_SET_VRING_ADRR.
 563          */
 564         if (vq->ready)
 565                 return dev;
 566
 567         ret = get_mempolicy(&node, NULL, 0, vq->desc, MPOL_F_NODE | MPOL_F_ADDR);
 568         if (ret) {
 569                 VHOST_LOG_CONFIG(ERR, "(%s) unable to get virtqueue %d numa information.\n",
 570                                 dev->ifname, index);
 571                 return dev;
 572         }
 573
 574         if (node == vq->numa_node)
 575                 goto out_dev_realloc;
 576
 577         vq = rte_realloc_socket(vq, sizeof(*vq), 0, node);
 578         if (!vq) {
 579                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc virtqueue %d on node %d\n",
 580                                 dev->ifname, index, node);
 581                 return dev;
 582         }
 583
 584         if (vq != dev->virtqueue[index]) {
 585                 VHOST_LOG_CONFIG(INFO, "(%s) reallocated virtqueue on node %d\n",
 586                                 dev->ifname, node);
 587                 dev->virtqueue[index] = vq;
 588                 vhost_user_iotlb_init(dev, index);
 589         }
 590
 591         if (vq_is_packed(dev)) {
 592                 struct vring_used_elem_packed *sup;
 593
 594                 sup = rte_realloc_socket(vq->shadow_used_packed, vq->size * sizeof(*sup),
 595                                 RTE_CACHE_LINE_SIZE, node);
 596                 if (!sup) {
 597                         VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc shadow packed on node %d\n",
 598                                         dev->ifname, node);
 599                         return dev;
 600                 }
 601                 vq->shadow_used_packed = sup;
 602         } else {
 603                 struct vring_used_elem *sus;
 604
 605                 sus = rte_realloc_socket(vq->shadow_used_split, vq->size * sizeof(*sus),
 606                                 RTE_CACHE_LINE_SIZE, node);
 607                 if (!sus) {
 608                         VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc shadow split on node %d\n",
 609                                         dev->ifname, node);
 610                         return dev;
 611                 }
 612                 vq->shadow_used_split = sus;
 613         }
 614
 615         bce = rte_realloc_socket(vq->batch_copy_elems, vq->size * sizeof(*bce),
 616                         RTE_CACHE_LINE_SIZE, node);
 617         if (!bce) {
 618                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc batch copy elem on node %d\n",
 619                                 dev->ifname, node);
 620                 return dev;
 621         }
 622         vq->batch_copy_elems = bce;
 623
 624         if (vq->log_cache) {
 625                 struct log_cache_entry *lc;
 626
 627                 lc = rte_realloc_socket(vq->log_cache, sizeof(*lc) * VHOST_LOG_CACHE_NR, 0, node);
 628                 if (!lc) {
 629                         VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc log cache on node %d\n",
 630                                         dev->ifname, node);
 631                         return dev;
 632                 }
 633                 vq->log_cache = lc;
 634         }
 635
 636         if (vq->resubmit_inflight) {
 637                 struct rte_vhost_resubmit_info *ri;
 638
 639                 ri = rte_realloc_socket(vq->resubmit_inflight, sizeof(*ri), 0, node);
 640                 if (!ri) {
 641                         VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc resubmit inflight on node %d\n",
 642                                         dev->ifname, node);
 643                         return dev;
 644                 }
 645                 vq->resubmit_inflight = ri;
 646
 647                 if (ri->resubmit_list) {
 648                         struct rte_vhost_resubmit_desc *rd;
 649
 650                         rd = rte_realloc_socket(ri->resubmit_list, sizeof(*rd) * ri->resubmit_num,
 651                                         0, node);
 652                         if (!rd) {
 653                                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc resubmit list on node %d\n",
 654                                                 dev->ifname, node);
 655                                 return dev;
 656                         }
 657                         ri->resubmit_list = rd;
 658                 }
 659         }
 660
 661         vq->numa_node = node;
 662
 663 out_dev_realloc:
 664
 665         if (dev->flags & VIRTIO_DEV_RUNNING)
 666                 return dev;
 667
 668         ret = get_mempolicy(&dev_node, NULL, 0, dev, MPOL_F_NODE | MPOL_F_ADDR);
 669         if (ret) {
 670                 VHOST_LOG_CONFIG(ERR, "(%s) unable to get numa information.\n", dev->ifname);
 671                 return dev;
 672         }
 673
 674         if (dev_node == node)
 675                 return dev;
 676
 677         dev = rte_realloc_socket(old_dev, sizeof(*dev), 0, node);
 678         if (!dev) {
 679                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc dev on node %d\n",
 680                                 dev->ifname, node);
 681                 return old_dev;
 682         }
 683
 684         VHOST_LOG_CONFIG(INFO, "(%s) reallocated device on node %d\n", dev->ifname, node);
 685         vhost_devices[dev->vid] = dev;
 686
 687         mem_size = sizeof(struct rte_vhost_memory) +
 688                 sizeof(struct rte_vhost_mem_region) * dev->mem->nregions;
 689         mem = rte_realloc_socket(dev->mem, mem_size, 0, node);
 690         if (!mem) {
 691                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc mem table on node %d\n",
 692                                 dev->ifname, node);
 693                 return dev;
 694         }
 695         dev->mem = mem;
 696
 697         gp = rte_realloc_socket(dev->guest_pages, dev->max_guest_pages * sizeof(*gp),
 698                         RTE_CACHE_LINE_SIZE, node);
 699         if (!gp) {
 700                 VHOST_LOG_CONFIG(ERR, "(%s) failed to realloc guest pages on node %d\n",
 701                                 dev->ifname, node);
 702                 return dev;
 703         }
 704         dev->guest_pages = gp;
 705
 706         return dev;
 707 }
 708 #else
 709 static struct virtio_net*
 710 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 711 {
 712         return dev;
 713 }
 714 #endif
 715
 716 /* Converts QEMU virtual address to Vhost virtual address. */
 717 static uint64_t
 718 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
 719 {
 720         struct rte_vhost_mem_region *r;
 721         uint32_t i;
 722
 723         if (unlikely(!dev || !dev->mem))
 724                 goto out_error;
 725
 726         /* Find the region where the address lives. */
 727         for (i = 0; i < dev->mem->nregions; i++) {
 728                 r = &dev->mem->regions[i];
 729
 730                 if (qva >= r->guest_user_addr &&
 731                     qva <  r->guest_user_addr + r->size) {
 732
 733                         if (unlikely(*len > r->guest_user_addr + r->size - qva))
 734                                 *len = r->guest_user_addr + r->size - qva;
 735
 736                         return qva - r->guest_user_addr +
 737                                r->host_user_addr;
 738                 }
 739         }
 740 out_error:
 741         *len = 0;
 742
 743         return 0;
 744 }
 745
 746
 747 /*
 748  * Converts ring address to Vhost virtual address.
 749  * If IOMMU is enabled, the ring address is a guest IO virtual address,
 750  * else it is a QEMU virtual address.
 751  */
 752 static uint64_t
 753 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 754                 uint64_t ra, uint64_t *size)
 755 {
 756         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 757                 uint64_t vva;
 758
 759                 vhost_user_iotlb_rd_lock(vq);
 760                 vva = vhost_iova_to_vva(dev, vq, ra,
 761                                         size, VHOST_ACCESS_RW);
 762                 vhost_user_iotlb_rd_unlock(vq);
 763
 764                 return vva;
 765         }
 766
 767         return qva_to_vva(dev, ra, size);
 768 }
 769
 770 static uint64_t
 771 log_addr_to_gpa(struct virtio_net *dev, struct vhost_virtqueue *vq)
 772 {
 773         uint64_t log_gpa;
 774
 775         vhost_user_iotlb_rd_lock(vq);
 776         log_gpa = translate_log_addr(dev, vq, vq->ring_addrs.log_guest_addr);
 777         vhost_user_iotlb_rd_unlock(vq);
 778
 779         return log_gpa;
 780 }
 781
 782 static struct virtio_net *
 783 translate_ring_addresses(struct virtio_net *dev, int vq_index)
 784 {
 785         struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 786         struct vhost_vring_addr *addr = &vq->ring_addrs;
 787         uint64_t len, expected_len;
 788
 789         if (addr->flags & (1 << VHOST_VRING_F_LOG)) {
 790                 vq->log_guest_addr =
 791                         log_addr_to_gpa(dev, vq);
 792                 if (vq->log_guest_addr == 0) {
 793                         VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map log_guest_addr.\n",
 794                                 dev->ifname);
 795                         return dev;
 796                 }
 797         }
 798
 799         if (vq_is_packed(dev)) {
 800                 len = sizeof(struct vring_packed_desc) * vq->size;
 801                 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 802                         ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len);
 803                 if (vq->desc_packed == NULL ||
 804                                 len != sizeof(struct vring_packed_desc) *
 805                                 vq->size) {
 806                         VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map desc_packed ring.\n",
 807                                 dev->ifname);
 808                         return dev;
 809                 }
 810
 811                 dev = numa_realloc(dev, vq_index);
 812                 vq = dev->virtqueue[vq_index];
 813                 addr = &vq->ring_addrs;
 814
 815                 len = sizeof(struct vring_packed_desc_event);
 816                 vq->driver_event = (struct vring_packed_desc_event *)
 817                                         (uintptr_t)ring_addr_to_vva(dev,
 818                                         vq, addr->avail_user_addr, &len);
 819                 if (vq->driver_event == NULL ||
 820                                 len != sizeof(struct vring_packed_desc_event)) {
 821                         VHOST_LOG_CONFIG(DEBUG, "(%s) failed to find driver area address.\n",
 822                                 dev->ifname);
 823                         return dev;
 824                 }
 825
 826                 len = sizeof(struct vring_packed_desc_event);
 827                 vq->device_event = (struct vring_packed_desc_event *)
 828                                         (uintptr_t)ring_addr_to_vva(dev,
 829                                         vq, addr->used_user_addr, &len);
 830                 if (vq->device_event == NULL ||
 831                                 len != sizeof(struct vring_packed_desc_event)) {
 832                         VHOST_LOG_CONFIG(DEBUG, "(%s) failed to find device area address.\n",
 833                                 dev->ifname);
 834                         return dev;
 835                 }
 836
 837                 vq->access_ok = true;
 838                 return dev;
 839         }
 840
 841         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 842         if (vq->desc && vq->avail && vq->used)
 843                 return dev;
 844
 845         len = sizeof(struct vring_desc) * vq->size;
 846         vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
 847                         vq, addr->desc_user_addr, &len);
 848         if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
 849                 VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map desc ring.\n", dev->ifname);
 850                 return dev;
 851         }
 852
 853         dev = numa_realloc(dev, vq_index);
 854         vq = dev->virtqueue[vq_index];
 855         addr = &vq->ring_addrs;
 856
 857         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
 858         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 859                 len += sizeof(uint16_t);
 860         expected_len = len;
 861         vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
 862                         vq, addr->avail_user_addr, &len);
 863         if (vq->avail == 0 || len != expected_len) {
 864                 VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map avail ring.\n", dev->ifname);
 865                 return dev;
 866         }
 867
 868         len = sizeof(struct vring_used) +
 869                 sizeof(struct vring_used_elem) * vq->size;
 870         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 871                 len += sizeof(uint16_t);
 872         expected_len = len;
 873         vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
 874                         vq, addr->used_user_addr, &len);
 875         if (vq->used == 0 || len != expected_len) {
 876                 VHOST_LOG_CONFIG(DEBUG, "(%s) failed to map used ring.\n", dev->ifname);
 877                 return dev;
 878         }
 879
 880         if (vq->last_used_idx != vq->used->idx) {
 881                 VHOST_LOG_CONFIG(WARNING, "(%s) last_used_idx (%u) and vq->used->idx (%u) mismatches;\n",
 882                         dev->ifname,
 883                         vq->last_used_idx, vq->used->idx);
 884                 vq->last_used_idx  = vq->used->idx;
 885                 vq->last_avail_idx = vq->used->idx;
 886                 VHOST_LOG_CONFIG(WARNING, "(%s) some packets maybe resent for Tx and dropped for Rx\n",
 887                         dev->ifname);
 888         }
 889
 890         vq->access_ok = true;
 891
 892         VHOST_LOG_CONFIG(DEBUG, "(%s) mapped address desc: %p\n", dev->ifname, vq->desc);
 893         VHOST_LOG_CONFIG(DEBUG, "(%s) mapped address avail: %p\n", dev->ifname, vq->avail);
 894         VHOST_LOG_CONFIG(DEBUG, "(%s) mapped address used: %p\n", dev->ifname, vq->used);
 895         VHOST_LOG_CONFIG(DEBUG, "(%s) log_guest_addr: %" PRIx64 "\n",
 896                         dev->ifname, vq->log_guest_addr);
 897
 898         return dev;
 899 }
 900
 901 /*
 902  * The virtio device sends us the desc, used and avail ring addresses.
 903  * This function then converts these to our address space.
 904  */
 905 static int
 906 vhost_user_set_vring_addr(struct virtio_net **pdev,
 907                         struct vhu_msg_context *ctx,
 908                         int main_fd __rte_unused)
 909 {
 910         struct virtio_net *dev = *pdev;
 911         struct vhost_virtqueue *vq;
 912         struct vhost_vring_addr *addr = &ctx->msg.payload.addr;
 913         bool access_ok;
 914
 915         if (validate_msg_fds(dev, ctx, 0) != 0)
 916                 return RTE_VHOST_MSG_RESULT_ERR;
 917
 918         if (dev->mem == NULL)
 919                 return RTE_VHOST_MSG_RESULT_ERR;
 920
 921         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 922         vq = dev->virtqueue[ctx->msg.payload.addr.index];
 923
 924         access_ok = vq->access_ok;
 925
 926         /*
 927          * Rings addresses should not be interpreted as long as the ring is not
 928          * started and enabled
 929          */
 930         memcpy(&vq->ring_addrs, addr, sizeof(*addr));
 931
 932         vring_invalidate(dev, vq);
 933
 934         if ((vq->enabled && (dev->features &
 935                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) ||
 936                         access_ok) {
 937                 dev = translate_ring_addresses(dev, ctx->msg.payload.addr.index);
 938                 if (!dev)
 939                         return RTE_VHOST_MSG_RESULT_ERR;
 940
 941                 *pdev = dev;
 942         }
 943
 944         return RTE_VHOST_MSG_RESULT_OK;
 945 }
 946
 947 /*
 948  * The virtio device sends us the available ring last used index.
 949  */
 950 static int
 951 vhost_user_set_vring_base(struct virtio_net **pdev,
 952                         struct vhu_msg_context *ctx,
 953                         int main_fd __rte_unused)
 954 {
 955         struct virtio_net *dev = *pdev;
 956         struct vhost_virtqueue *vq = dev->virtqueue[ctx->msg.payload.state.index];
 957         uint64_t val = ctx->msg.payload.state.num;
 958
 959         if (validate_msg_fds(dev, ctx, 0) != 0)
 960                 return RTE_VHOST_MSG_RESULT_ERR;
 961
 962         if (vq_is_packed(dev)) {
 963                 /*
 964                  * Bit[0:14]: avail index
 965                  * Bit[15]: avail wrap counter
 966                  */
 967                 vq->last_avail_idx = val & 0x7fff;
 968                 vq->avail_wrap_counter = !!(val & (0x1 << 15));
 969                 /*
 970                  * Set used index to same value as available one, as
 971                  * their values should be the same since ring processing
 972                  * was stopped at get time.
 973                  */
 974                 vq->last_used_idx = vq->last_avail_idx;
 975                 vq->used_wrap_counter = vq->avail_wrap_counter;
 976         } else {
 977                 vq->last_used_idx = ctx->msg.payload.state.num;
 978                 vq->last_avail_idx = ctx->msg.payload.state.num;
 979         }
 980
 981         VHOST_LOG_CONFIG(INFO,
 982                 "(%s) vring base idx:%u last_used_idx:%u last_avail_idx:%u.\n",
 983                 dev->ifname, ctx->msg.payload.state.index, vq->last_used_idx,
 984                 vq->last_avail_idx);
 985
 986         return RTE_VHOST_MSG_RESULT_OK;
 987 }
 988
 989 static int
 990 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 991                    uint64_t host_phys_addr, uint64_t size)
 992 {
 993         struct guest_page *page, *last_page;
 994         struct guest_page *old_pages;
 995
 996         if (dev->nr_guest_pages == dev->max_guest_pages) {
 997                 dev->max_guest_pages *= 2;
 998                 old_pages = dev->guest_pages;
 999                 dev->guest_pages = rte_realloc(dev->guest_pages,
1000                                         dev->max_guest_pages * sizeof(*page),
1001                                         RTE_CACHE_LINE_SIZE);
1002                 if (dev->guest_pages == NULL) {
1003                         VHOST_LOG_CONFIG(ERR, "(%s) cannot realloc guest_pages\n", dev->ifname);
1004                         rte_free(old_pages);
1005                         return -1;
1006                 }
1007         }
1008
1009         if (dev->nr_guest_pages > 0) {
1010                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
1011                 /* merge if the two pages are continuous */
1012                 if (host_phys_addr == last_page->host_phys_addr +
1013                                       last_page->size) {
1014                         last_page->size += size;
1015                         return 0;
1016                 }
1017         }
1018
1019         page = &dev->guest_pages[dev->nr_guest_pages++];
1020         page->guest_phys_addr = guest_phys_addr;
1021         page->host_phys_addr  = host_phys_addr;
1022         page->size = size;
1023
1024         return 0;
1025 }
1026
1027 static int
1028 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
1029                 uint64_t page_size)
1030 {
1031         uint64_t reg_size = reg->size;
1032         uint64_t host_user_addr  = reg->host_user_addr;
1033         uint64_t guest_phys_addr = reg->guest_phys_addr;
1034         uint64_t host_phys_addr;
1035         uint64_t size;
1036
1037         host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
1038         size = page_size - (guest_phys_addr & (page_size - 1));
1039         size = RTE_MIN(size, reg_size);
1040
1041         if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size) < 0)
1042                 return -1;
1043
1044         host_user_addr  += size;
1045         guest_phys_addr += size;
1046         reg_size -= size;
1047
1048         while (reg_size > 0) {
1049                 size = RTE_MIN(reg_size, page_size);
1050                 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
1051                                                   host_user_addr);
1052                 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
1053                                 size) < 0)
1054                         return -1;
1055
1056                 host_user_addr  += size;
1057                 guest_phys_addr += size;
1058                 reg_size -= size;
1059         }
1060
1061         /* sort guest page array if over binary search threshold */
1062         if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
1063                 qsort((void *)dev->guest_pages, dev->nr_guest_pages,
1064                         sizeof(struct guest_page), guest_page_addrcmp);
1065         }
1066
1067         return 0;
1068 }
1069
1070 #ifdef RTE_LIBRTE_VHOST_DEBUG
1071 /* TODO: enable it only in debug mode? */
1072 static void
1073 dump_guest_pages(struct virtio_net *dev)
1074 {
1075         uint32_t i;
1076         struct guest_page *page;
1077
1078         for (i = 0; i < dev->nr_guest_pages; i++) {
1079                 page = &dev->guest_pages[i];
1080
1081                 VHOST_LOG_CONFIG(INFO, "(%s) guest physical page region %u\n",
1082                                 dev->ifname, i);
1083                 VHOST_LOG_CONFIG(INFO, "(%s)\tguest_phys_addr: %" PRIx64 "\n",
1084                                 dev->ifname, page->guest_phys_addr);
1085                 VHOST_LOG_CONFIG(INFO, "(%s)\thost_phys_addr : %" PRIx64 "\n",
1086                                 dev->ifname, page->host_phys_addr);
1087                 VHOST_LOG_CONFIG(INFO, "(%s)\tsize           : %" PRIx64 "\n",
1088                                 dev->ifname, page->size);
1089         }
1090 }
1091 #else
1092 #define dump_guest_pages(dev)
1093 #endif
1094
1095 static bool
1096 vhost_memory_changed(struct VhostUserMemory *new,
1097                      struct rte_vhost_memory *old)
1098 {
1099         uint32_t i;
1100
1101         if (new->nregions != old->nregions)
1102                 return true;
1103
1104         for (i = 0; i < new->nregions; ++i) {
1105                 VhostUserMemoryRegion *new_r = &new->regions[i];
1106                 struct rte_vhost_mem_region *old_r = &old->regions[i];
1107
1108                 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
1109                         return true;
1110                 if (new_r->memory_size != old_r->size)
1111                         return true;
1112                 if (new_r->userspace_addr != old_r->guest_user_addr)
1113                         return true;
1114         }
1115
1116         return false;
1117 }
1118
1119 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
1120 static int
1121 vhost_user_postcopy_region_register(struct virtio_net *dev,
1122                 struct rte_vhost_mem_region *reg)
1123 {
1124         struct uffdio_register reg_struct;
1125
1126         /*
1127          * Let's register all the mmapped area to ensure
1128          * alignment on page boundary.
1129          */
1130         reg_struct.range.start = (uint64_t)(uintptr_t)reg->mmap_addr;
1131         reg_struct.range.len = reg->mmap_size;
1132         reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING;
1133
1134         if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER,
1135                                 &reg_struct)) {
1136                 VHOST_LOG_CONFIG(ERR, "(%s) failed to register ufd for region "
1137                                 "%" PRIx64 " - %" PRIx64 " (ufd = %d) %s\n",
1138                                 dev->ifname,
1139                                 (uint64_t)reg_struct.range.start,
1140                                 (uint64_t)reg_struct.range.start +
1141                                 (uint64_t)reg_struct.range.len - 1,
1142                                 dev->postcopy_ufd,
1143                                 strerror(errno));
1144                 return -1;
1145         }
1146
1147         VHOST_LOG_CONFIG(INFO,
1148                         "(%s)\t userfaultfd registered for range : %" PRIx64 " - %" PRIx64 "\n",
1149                         dev->ifname,
1150                         (uint64_t)reg_struct.range.start,
1151                         (uint64_t)reg_struct.range.start +
1152                         (uint64_t)reg_struct.range.len - 1);
1153
1154         return 0;
1155 }
1156 #else
1157 static int
1158 vhost_user_postcopy_region_register(struct virtio_net *dev __rte_unused,
1159                 struct rte_vhost_mem_region *reg __rte_unused)
1160 {
1161         return -1;
1162 }
1163 #endif
1164
1165 static int
1166 vhost_user_postcopy_register(struct virtio_net *dev, int main_fd,
1167                 struct vhu_msg_context *ctx)
1168 {
1169         struct VhostUserMemory *memory;
1170         struct rte_vhost_mem_region *reg;
1171         struct vhu_msg_context ack_ctx;
1172         uint32_t i;
1173
1174         if (!dev->postcopy_listening)
1175                 return 0;
1176
1177         /*
1178          * We haven't a better way right now than sharing
1179          * DPDK's virtual address with Qemu, so that Qemu can
1180          * retrieve the region offset when handling userfaults.
1181          */
1182         memory = &ctx->msg.payload.memory;
1183         for (i = 0; i < memory->nregions; i++) {
1184                 reg = &dev->mem->regions[i];
1185                 memory->regions[i].userspace_addr = reg->host_user_addr;
1186         }
1187
1188         /* Send the addresses back to qemu */
1189         ctx->fd_num = 0;
1190         send_vhost_reply(dev, main_fd, ctx);
1191
1192         /* Wait for qemu to acknowledge it got the addresses
1193          * we've got to wait before we're allowed to generate faults.
1194          */
1195         if (read_vhost_message(dev, main_fd, &ack_ctx) <= 0) {
1196                 VHOST_LOG_CONFIG(ERR, "(%s) failed to read qemu ack on postcopy set-mem-table\n",
1197                                 dev->ifname);
1198                 return -1;
1199         }
1200
1201         if (validate_msg_fds(dev, &ack_ctx, 0) != 0)
1202                 return -1;
1203
1204         if (ack_ctx.msg.request.master != VHOST_USER_SET_MEM_TABLE) {
1205                 VHOST_LOG_CONFIG(ERR, "(%s) bad qemu ack on postcopy set-mem-table (%d)\n",
1206                                 dev->ifname, ack_ctx.msg.request.master);
1207                 return -1;
1208         }
1209
1210         /* Now userfault register and we can use the memory */
1211         for (i = 0; i < memory->nregions; i++) {
1212                 reg = &dev->mem->regions[i];
1213                 if (vhost_user_postcopy_region_register(dev, reg) < 0)
1214                         return -1;
1215         }
1216
1217         return 0;
1218 }
1219
1220 static int
1221 vhost_user_mmap_region(struct virtio_net *dev,
1222                 struct rte_vhost_mem_region *region,
1223                 uint64_t mmap_offset)
1224 {
1225         void *mmap_addr;
1226         uint64_t mmap_size;
1227         uint64_t alignment;
1228         int populate;
1229         int ret;
1230
1231         /* Check for memory_size + mmap_offset overflow */
1232         if (mmap_offset >= -region->size) {
1233                 VHOST_LOG_CONFIG(ERR, "(%s) mmap_offset (%#"PRIx64") and memory_size (%#"PRIx64") overflow\n",
1234                                 dev->ifname, mmap_offset, region->size);
1235                 return -1;
1236         }
1237
1238         mmap_size = region->size + mmap_offset;
1239
1240         /* mmap() without flag of MAP_ANONYMOUS, should be called with length
1241          * argument aligned with hugepagesz at older longterm version Linux,
1242          * like 2.6.32 and 3.2.72, or mmap() will fail with EINVAL.
1243          *
1244          * To avoid failure, make sure in caller to keep length aligned.
1245          */
1246         alignment = get_blk_size(region->fd);
1247         if (alignment == (uint64_t)-1) {
1248                 VHOST_LOG_CONFIG(ERR, "(%s) couldn't get hugepage size through fstat\n",
1249                                 dev->ifname);
1250                 return -1;
1251         }
1252         mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
1253         if (mmap_size == 0) {
1254                 /*
1255                  * It could happen if initial mmap_size + alignment overflows
1256                  * the sizeof uint64, which could happen if either mmap_size or
1257                  * alignment value is wrong.
1258                  *
1259                  * mmap() kernel implementation would return an error, but
1260                  * better catch it before and provide useful info in the logs.
1261                  */
1262                 VHOST_LOG_CONFIG(ERR, "(%s) mmap size (0x%" PRIx64 ") or alignment (0x%" PRIx64 ") is invalid\n",
1263                                 dev->ifname, region->size + mmap_offset, alignment);
1264                 return -1;
1265         }
1266
1267         populate = dev->async_copy ? MAP_POPULATE : 0;
1268         mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
1269                         MAP_SHARED | populate, region->fd, 0);
1270
1271         if (mmap_addr == MAP_FAILED) {
1272                 VHOST_LOG_CONFIG(ERR, "(%s) mmap failed (%s).\n", dev->ifname, strerror(errno));
1273                 return -1;
1274         }
1275
1276         region->mmap_addr = mmap_addr;
1277         region->mmap_size = mmap_size;
1278         region->host_user_addr = (uint64_t)(uintptr_t)mmap_addr + mmap_offset;
1279
1280         if (dev->async_copy) {
1281                 if (add_guest_pages(dev, region, alignment) < 0) {
1282                         VHOST_LOG_CONFIG(ERR, "(%s) adding guest pages to region failed.\n",
1283                                         dev->ifname);
1284                         return -1;
1285                 }
1286
1287                 if (rte_vfio_is_enabled("vfio")) {
1288                         ret = async_dma_map(dev, region, true);
1289                         if (ret) {
1290                                 VHOST_LOG_CONFIG(ERR,
1291                                         "(%s) configure IOMMU for DMA engine failed\n",
1292                                         dev->ifname);
1293                                 return -1;
1294                         }
1295                 }
1296         }
1297
1298         VHOST_LOG_CONFIG(INFO, "(%s) guest memory region size: 0x%" PRIx64 "\n",
1299                         dev->ifname, region->size);
1300         VHOST_LOG_CONFIG(INFO, "(%s)\t guest physical addr: 0x%" PRIx64 "\n",
1301                         dev->ifname, region->guest_phys_addr);
1302         VHOST_LOG_CONFIG(INFO, "(%s)\t guest virtual  addr: 0x%" PRIx64 "\n",
1303                         dev->ifname, region->guest_user_addr);
1304         VHOST_LOG_CONFIG(INFO, "(%s)\t host  virtual  addr: 0x%" PRIx64 "\n",
1305                         dev->ifname, region->host_user_addr);
1306         VHOST_LOG_CONFIG(INFO, "(%s)\t mmap addr : 0x%" PRIx64 "\n",
1307                         dev->ifname, (uint64_t)(uintptr_t)mmap_addr);
1308         VHOST_LOG_CONFIG(INFO, "(%s)\t mmap size : 0x%" PRIx64 "\n",
1309                         dev->ifname, mmap_size);
1310         VHOST_LOG_CONFIG(INFO, "(%s)\t mmap align: 0x%" PRIx64 "\n",
1311                         dev->ifname, alignment);
1312         VHOST_LOG_CONFIG(INFO, "(%s)\t mmap off  : 0x%" PRIx64 "\n",
1313                         dev->ifname, mmap_offset);
1314
1315         return 0;
1316 }
1317
1318 static int
1319 vhost_user_set_mem_table(struct virtio_net **pdev,
1320                         struct vhu_msg_context *ctx,
1321                         int main_fd)
1322 {
1323         struct virtio_net *dev = *pdev;
1324         struct VhostUserMemory *memory = &ctx->msg.payload.memory;
1325         struct rte_vhost_mem_region *reg;
1326         int numa_node = SOCKET_ID_ANY;
1327         uint64_t mmap_offset;
1328         uint32_t i;
1329         bool async_notify = false;
1330
1331         if (validate_msg_fds(dev, ctx, memory->nregions) != 0)
1332                 return RTE_VHOST_MSG_RESULT_ERR;
1333
1334         if (memory->nregions > VHOST_MEMORY_MAX_NREGIONS) {
1335                 VHOST_LOG_CONFIG(ERR, "(%s) too many memory regions (%u)\n",
1336                                 dev->ifname, memory->nregions);
1337                 goto close_msg_fds;
1338         }
1339
1340         if (dev->mem && !vhost_memory_changed(memory, dev->mem)) {
1341                 VHOST_LOG_CONFIG(INFO, "(%s) memory regions not changed\n", dev->ifname);
1342
1343                 close_msg_fds(ctx);
1344
1345                 return RTE_VHOST_MSG_RESULT_OK;
1346         }
1347
1348         if (dev->mem) {
1349                 if (dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) {
1350                         struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
1351
1352                         if (vdpa_dev && vdpa_dev->ops->dev_close)
1353                                 vdpa_dev->ops->dev_close(dev->vid);
1354                         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1355                 }
1356
1357                 /* notify the vhost application to stop DMA transfers */
1358                 if (dev->async_copy && dev->notify_ops->vring_state_changed) {
1359                         for (i = 0; i < dev->nr_vring; i++) {
1360                                 dev->notify_ops->vring_state_changed(dev->vid,
1361                                                 i, 0);
1362                         }
1363                         async_notify = true;
1364                 }
1365
1366                 free_mem_region(dev);
1367                 rte_free(dev->mem);
1368                 dev->mem = NULL;
1369         }
1370
1371         /* Flush IOTLB cache as previous HVAs are now invalid */
1372         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1373                 for (i = 0; i < dev->nr_vring; i++)
1374                         vhost_user_iotlb_flush_all(dev->virtqueue[i]);
1375
1376         /*
1377          * If VQ 0 has already been allocated, try to allocate on the same
1378          * NUMA node. It can be reallocated later in numa_realloc().
1379          */
1380         if (dev->nr_vring > 0)
1381                 numa_node = dev->virtqueue[0]->numa_node;
1382
1383         dev->nr_guest_pages = 0;
1384         if (dev->guest_pages == NULL) {
1385                 dev->max_guest_pages = 8;
1386                 dev->guest_pages = rte_zmalloc_socket(NULL,
1387                                         dev->max_guest_pages *
1388                                         sizeof(struct guest_page),
1389                                         RTE_CACHE_LINE_SIZE,
1390                                         numa_node);
1391                 if (dev->guest_pages == NULL) {
1392                         VHOST_LOG_CONFIG(ERR,
1393                                 "(%s) failed to allocate memory for dev->guest_pages\n",
1394                                 dev->ifname);
1395                         goto close_msg_fds;
1396                 }
1397         }
1398
1399         dev->mem = rte_zmalloc_socket("vhost-mem-table", sizeof(struct rte_vhost_memory) +
1400                 sizeof(struct rte_vhost_mem_region) * memory->nregions, 0, numa_node);
1401         if (dev->mem == NULL) {
1402                 VHOST_LOG_CONFIG(ERR,
1403                         "(%s) failed to allocate memory for dev->mem\n",
1404                         dev->ifname);
1405                 goto free_guest_pages;
1406         }
1407
1408         for (i = 0; i < memory->nregions; i++) {
1409                 reg = &dev->mem->regions[i];
1410
1411                 reg->guest_phys_addr = memory->regions[i].guest_phys_addr;
1412                 reg->guest_user_addr = memory->regions[i].userspace_addr;
1413                 reg->size            = memory->regions[i].memory_size;
1414                 reg->fd              = ctx->fds[i];
1415
1416                 /*
1417                  * Assign invalid file descriptor value to avoid double
1418                  * closing on error path.
1419                  */
1420                 ctx->fds[i] = -1;
1421
1422                 mmap_offset = memory->regions[i].mmap_offset;
1423
1424                 if (vhost_user_mmap_region(dev, reg, mmap_offset) < 0) {
1425                         VHOST_LOG_CONFIG(ERR, "(%s) failed to mmap region %u\n", dev->ifname, i);
1426                         goto free_mem_table;
1427                 }
1428
1429                 dev->mem->nregions++;
1430         }
1431
1432         if (vhost_user_postcopy_register(dev, main_fd, ctx) < 0)
1433                 goto free_mem_table;
1434
1435         for (i = 0; i < dev->nr_vring; i++) {
1436                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1437
1438                 if (!vq)
1439                         continue;
1440
1441                 if (vq->desc || vq->avail || vq->used) {
1442                         /*
1443                          * If the memory table got updated, the ring addresses
1444                          * need to be translated again as virtual addresses have
1445                          * changed.
1446                          */
1447                         vring_invalidate(dev, vq);
1448
1449                         dev = translate_ring_addresses(dev, i);
1450                         if (!dev) {
1451                                 dev = *pdev;
1452                                 goto free_mem_table;
1453                         }
1454
1455                         *pdev = dev;
1456                 }
1457         }
1458
1459         dump_guest_pages(dev);
1460
1461         if (async_notify) {
1462                 for (i = 0; i < dev->nr_vring; i++)
1463                         dev->notify_ops->vring_state_changed(dev->vid, i, 1);
1464         }
1465
1466         return RTE_VHOST_MSG_RESULT_OK;
1467
1468 free_mem_table:
1469         free_mem_region(dev);
1470         rte_free(dev->mem);
1471         dev->mem = NULL;
1472
1473 free_guest_pages:
1474         rte_free(dev->guest_pages);
1475         dev->guest_pages = NULL;
1476 close_msg_fds:
1477         close_msg_fds(ctx);
1478         return RTE_VHOST_MSG_RESULT_ERR;
1479 }
1480
1481 static bool
1482 vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq)
1483 {
1484         bool rings_ok;
1485
1486         if (!vq)
1487                 return false;
1488
1489         if (vq_is_packed(dev))
1490                 rings_ok = vq->desc_packed && vq->driver_event &&
1491                         vq->device_event;
1492         else
1493                 rings_ok = vq->desc && vq->avail && vq->used;
1494
1495         return rings_ok &&
1496                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1497                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1498                vq->enabled;
1499 }
1500
1501 #define VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY 2u
1502
1503 static int
1504 virtio_is_ready(struct virtio_net *dev)
1505 {
1506         struct vhost_virtqueue *vq;
1507         uint32_t i, nr_vring = dev->nr_vring;
1508
1509         if (dev->flags & VIRTIO_DEV_READY)
1510                 return 1;
1511
1512         if (!dev->nr_vring)
1513                 return 0;
1514
1515         if (dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) {
1516                 nr_vring = VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY;
1517
1518                 if (dev->nr_vring < nr_vring)
1519                         return 0;
1520         }
1521
1522         for (i = 0; i < nr_vring; i++) {
1523                 vq = dev->virtqueue[i];
1524
1525                 if (!vq_is_ready(dev, vq))
1526                         return 0;
1527         }
1528
1529         /* If supported, ensure the frontend is really done with config */
1530         if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS))
1531                 if (!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK))
1532                         return 0;
1533
1534         dev->flags |= VIRTIO_DEV_READY;
1535
1536         if (!(dev->flags & VIRTIO_DEV_RUNNING))
1537                 VHOST_LOG_CONFIG(INFO, "(%s) virtio is now ready for processing.\n", dev->ifname);
1538         return 1;
1539 }
1540
1541 static void *
1542 inflight_mem_alloc(struct virtio_net *dev, const char *name, size_t size, int *fd)
1543 {
1544         void *ptr;
1545         int mfd = -1;
1546         char fname[20] = "/tmp/memfd-XXXXXX";
1547
1548         *fd = -1;
1549 #ifdef MEMFD_SUPPORTED
1550         mfd = memfd_create(name, MFD_CLOEXEC);
1551 #else
1552         RTE_SET_USED(name);
1553 #endif
1554         if (mfd == -1) {
1555                 mfd = mkstemp(fname);
1556                 if (mfd == -1) {
1557                         VHOST_LOG_CONFIG(ERR, "(%s) failed to get inflight buffer fd\n",
1558                                         dev->ifname);
1559                         return NULL;
1560                 }
1561
1562                 unlink(fname);
1563         }
1564
1565         if (ftruncate(mfd, size) == -1) {
1566                 VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc inflight buffer\n", dev->ifname);
1567                 close(mfd);
1568                 return NULL;
1569         }
1570
1571         ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
1572         if (ptr == MAP_FAILED) {
1573                 VHOST_LOG_CONFIG(ERR, "(%s) failed to mmap inflight buffer\n", dev->ifname);
1574                 close(mfd);
1575                 return NULL;
1576         }
1577
1578         *fd = mfd;
1579         return ptr;
1580 }
1581
1582 static uint32_t
1583 get_pervq_shm_size_split(uint16_t queue_size)
1584 {
1585         return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_split) *
1586                                   queue_size + sizeof(uint64_t) +
1587                                   sizeof(uint16_t) * 4, INFLIGHT_ALIGNMENT);
1588 }
1589
1590 static uint32_t
1591 get_pervq_shm_size_packed(uint16_t queue_size)
1592 {
1593         return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_packed)
1594                                   * queue_size + sizeof(uint64_t) +
1595                                   sizeof(uint16_t) * 6 + sizeof(uint8_t) * 9,
1596                                   INFLIGHT_ALIGNMENT);
1597 }
1598
1599 static int
1600 vhost_user_get_inflight_fd(struct virtio_net **pdev,
1601                            struct vhu_msg_context *ctx,
1602                            int main_fd __rte_unused)
1603 {
1604         struct rte_vhost_inflight_info_packed *inflight_packed;
1605         uint64_t pervq_inflight_size, mmap_size;
1606         uint16_t num_queues, queue_size;
1607         struct virtio_net *dev = *pdev;
1608         int fd, i, j;
1609         int numa_node = SOCKET_ID_ANY;
1610         void *addr;
1611
1612         if (ctx->msg.size != sizeof(ctx->msg.payload.inflight)) {
1613                 VHOST_LOG_CONFIG(ERR, "(%s) invalid get_inflight_fd message size is %d\n",
1614                         dev->ifname, ctx->msg.size);
1615                 return RTE_VHOST_MSG_RESULT_ERR;
1616         }
1617
1618         /*
1619          * If VQ 0 has already been allocated, try to allocate on the same
1620          * NUMA node. It can be reallocated later in numa_realloc().
1621          */
1622         if (dev->nr_vring > 0)
1623                 numa_node = dev->virtqueue[0]->numa_node;
1624
1625         if (dev->inflight_info == NULL) {
1626                 dev->inflight_info = rte_zmalloc_socket("inflight_info",
1627                                 sizeof(struct inflight_mem_info), 0, numa_node);
1628                 if (!dev->inflight_info) {
1629                         VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc dev inflight area\n",
1630                                         dev->ifname);
1631                         return RTE_VHOST_MSG_RESULT_ERR;
1632                 }
1633                 dev->inflight_info->fd = -1;
1634         }
1635
1636         num_queues = ctx->msg.payload.inflight.num_queues;
1637         queue_size = ctx->msg.payload.inflight.queue_size;
1638
1639         VHOST_LOG_CONFIG(INFO, "(%s) get_inflight_fd num_queues: %u\n",
1640                 dev->ifname, ctx->msg.payload.inflight.num_queues);
1641         VHOST_LOG_CONFIG(INFO, "(%s) get_inflight_fd queue_size: %u\n",
1642                 dev->ifname, ctx->msg.payload.inflight.queue_size);
1643
1644         if (vq_is_packed(dev))
1645                 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1646         else
1647                 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1648
1649         mmap_size = num_queues * pervq_inflight_size;
1650         addr = inflight_mem_alloc(dev, "vhost-inflight", mmap_size, &fd);
1651         if (!addr) {
1652                 VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc vhost inflight area\n", dev->ifname);
1653                         ctx->msg.payload.inflight.mmap_size = 0;
1654                 return RTE_VHOST_MSG_RESULT_ERR;
1655         }
1656         memset(addr, 0, mmap_size);
1657
1658         if (dev->inflight_info->addr) {
1659                 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1660                 dev->inflight_info->addr = NULL;
1661         }
1662
1663         if (dev->inflight_info->fd >= 0) {
1664                 close(dev->inflight_info->fd);
1665                 dev->inflight_info->fd = -1;
1666         }
1667
1668         dev->inflight_info->addr = addr;
1669         dev->inflight_info->size = ctx->msg.payload.inflight.mmap_size = mmap_size;
1670         dev->inflight_info->fd = ctx->fds[0] = fd;
1671         ctx->msg.payload.inflight.mmap_offset = 0;
1672         ctx->fd_num = 1;
1673
1674         if (vq_is_packed(dev)) {
1675                 for (i = 0; i < num_queues; i++) {
1676                         inflight_packed =
1677                                 (struct rte_vhost_inflight_info_packed *)addr;
1678                         inflight_packed->used_wrap_counter = 1;
1679                         inflight_packed->old_used_wrap_counter = 1;
1680                         for (j = 0; j < queue_size; j++)
1681                                 inflight_packed->desc[j].next = j + 1;
1682                         addr = (void *)((char *)addr + pervq_inflight_size);
1683                 }
1684         }
1685
1686         VHOST_LOG_CONFIG(INFO, "(%s) send inflight mmap_size: %"PRIu64"\n",
1687                         dev->ifname, ctx->msg.payload.inflight.mmap_size);
1688         VHOST_LOG_CONFIG(INFO, "(%s) send inflight mmap_offset: %"PRIu64"\n",
1689                         dev->ifname, ctx->msg.payload.inflight.mmap_offset);
1690         VHOST_LOG_CONFIG(INFO, "(%s) send inflight fd: %d\n", dev->ifname, ctx->fds[0]);
1691
1692         return RTE_VHOST_MSG_RESULT_REPLY;
1693 }
1694
1695 static int
1696 vhost_user_set_inflight_fd(struct virtio_net **pdev,
1697                            struct vhu_msg_context *ctx,
1698                            int main_fd __rte_unused)
1699 {
1700         uint64_t mmap_size, mmap_offset;
1701         uint16_t num_queues, queue_size;
1702         struct virtio_net *dev = *pdev;
1703         uint32_t pervq_inflight_size;
1704         struct vhost_virtqueue *vq;
1705         void *addr;
1706         int fd, i;
1707         int numa_node = SOCKET_ID_ANY;
1708
1709         fd = ctx->fds[0];
1710         if (ctx->msg.size != sizeof(ctx->msg.payload.inflight) || fd < 0) {
1711                 VHOST_LOG_CONFIG(ERR, "(%s) invalid set_inflight_fd message size is %d,fd is %d\n",
1712                         dev->ifname, ctx->msg.size, fd);
1713                 return RTE_VHOST_MSG_RESULT_ERR;
1714         }
1715
1716         mmap_size = ctx->msg.payload.inflight.mmap_size;
1717         mmap_offset = ctx->msg.payload.inflight.mmap_offset;
1718         num_queues = ctx->msg.payload.inflight.num_queues;
1719         queue_size = ctx->msg.payload.inflight.queue_size;
1720
1721         if (vq_is_packed(dev))
1722                 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1723         else
1724                 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1725
1726         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd mmap_size: %"PRIu64"\n",
1727                         dev->ifname, mmap_size);
1728         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd mmap_offset: %"PRIu64"\n",
1729                         dev->ifname, mmap_offset);
1730         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd num_queues: %u\n", dev->ifname, num_queues);
1731         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd queue_size: %u\n", dev->ifname, queue_size);
1732         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd fd: %d\n", dev->ifname, fd);
1733         VHOST_LOG_CONFIG(INFO, "(%s) set_inflight_fd pervq_inflight_size: %d\n",
1734                         dev->ifname, pervq_inflight_size);
1735
1736         /*
1737          * If VQ 0 has already been allocated, try to allocate on the same
1738          * NUMA node. It can be reallocated later in numa_realloc().
1739          */
1740         if (dev->nr_vring > 0)
1741                 numa_node = dev->virtqueue[0]->numa_node;
1742
1743         if (!dev->inflight_info) {
1744                 dev->inflight_info = rte_zmalloc_socket("inflight_info",
1745                                 sizeof(struct inflight_mem_info), 0, numa_node);
1746                 if (dev->inflight_info == NULL) {
1747                         VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc dev inflight area\n",
1748                                         dev->ifname);
1749                         return RTE_VHOST_MSG_RESULT_ERR;
1750                 }
1751                 dev->inflight_info->fd = -1;
1752         }
1753
1754         if (dev->inflight_info->addr) {
1755                 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1756                 dev->inflight_info->addr = NULL;
1757         }
1758
1759         addr = mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
1760                     fd, mmap_offset);
1761         if (addr == MAP_FAILED) {
1762                 VHOST_LOG_CONFIG(ERR, "(%s) failed to mmap share memory.\n", dev->ifname);
1763                 return RTE_VHOST_MSG_RESULT_ERR;
1764         }
1765
1766         if (dev->inflight_info->fd >= 0) {
1767                 close(dev->inflight_info->fd);
1768                 dev->inflight_info->fd = -1;
1769         }
1770
1771         dev->inflight_info->fd = fd;
1772         dev->inflight_info->addr = addr;
1773         dev->inflight_info->size = mmap_size;
1774
1775         for (i = 0; i < num_queues; i++) {
1776                 vq = dev->virtqueue[i];
1777                 if (!vq)
1778                         continue;
1779
1780                 if (vq_is_packed(dev)) {
1781                         vq->inflight_packed = addr;
1782                         vq->inflight_packed->desc_num = queue_size;
1783                 } else {
1784                         vq->inflight_split = addr;
1785                         vq->inflight_split->desc_num = queue_size;
1786                 }
1787                 addr = (void *)((char *)addr + pervq_inflight_size);
1788         }
1789
1790         return RTE_VHOST_MSG_RESULT_OK;
1791 }
1792
1793 static int
1794 vhost_user_set_vring_call(struct virtio_net **pdev,
1795                         struct vhu_msg_context *ctx,
1796                         int main_fd __rte_unused)
1797 {
1798         struct virtio_net *dev = *pdev;
1799         struct vhost_vring_file file;
1800         struct vhost_virtqueue *vq;
1801         int expected_fds;
1802
1803         expected_fds = (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1804         if (validate_msg_fds(dev, ctx, expected_fds) != 0)
1805                 return RTE_VHOST_MSG_RESULT_ERR;
1806
1807         file.index = ctx->msg.payload.u64 & VHOST_USER_VRING_IDX_MASK;
1808         if (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1809                 file.fd = VIRTIO_INVALID_EVENTFD;
1810         else
1811                 file.fd = ctx->fds[0];
1812         VHOST_LOG_CONFIG(INFO, "(%s) vring call idx:%d file:%d\n",
1813                         dev->ifname, file.index, file.fd);
1814
1815         vq = dev->virtqueue[file.index];
1816
1817         if (vq->ready) {
1818                 vq->ready = false;
1819                 vhost_user_notify_queue_state(dev, file.index, 0);
1820         }
1821
1822         if (vq->callfd >= 0)
1823                 close(vq->callfd);
1824
1825         vq->callfd = file.fd;
1826
1827         return RTE_VHOST_MSG_RESULT_OK;
1828 }
1829
1830 static int vhost_user_set_vring_err(struct virtio_net **pdev,
1831                         struct vhu_msg_context *ctx,
1832                         int main_fd __rte_unused)
1833 {
1834         struct virtio_net *dev = *pdev;
1835         int expected_fds;
1836
1837         expected_fds = (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1838         if (validate_msg_fds(dev, ctx, expected_fds) != 0)
1839                 return RTE_VHOST_MSG_RESULT_ERR;
1840
1841         if (!(ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1842                 close(ctx->fds[0]);
1843         VHOST_LOG_CONFIG(INFO, "(%s) not implemented\n", dev->ifname);
1844
1845         return RTE_VHOST_MSG_RESULT_OK;
1846 }
1847
1848 static int
1849 resubmit_desc_compare(const void *a, const void *b)
1850 {
1851         const struct rte_vhost_resubmit_desc *desc0 = a;
1852         const struct rte_vhost_resubmit_desc *desc1 = b;
1853
1854         if (desc1->counter > desc0->counter)
1855                 return 1;
1856
1857         return -1;
1858 }
1859
1860 static int
1861 vhost_check_queue_inflights_split(struct virtio_net *dev,
1862                                   struct vhost_virtqueue *vq)
1863 {
1864         uint16_t i;
1865         uint16_t resubmit_num = 0, last_io, num;
1866         struct vring_used *used = vq->used;
1867         struct rte_vhost_resubmit_info *resubmit;
1868         struct rte_vhost_inflight_info_split *inflight_split;
1869
1870         if (!(dev->protocol_features &
1871             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1872                 return RTE_VHOST_MSG_RESULT_OK;
1873
1874         /* The frontend may still not support the inflight feature
1875          * although we negotiate the protocol feature.
1876          */
1877         if ((!vq->inflight_split))
1878                 return RTE_VHOST_MSG_RESULT_OK;
1879
1880         if (!vq->inflight_split->version) {
1881                 vq->inflight_split->version = INFLIGHT_VERSION;
1882                 return RTE_VHOST_MSG_RESULT_OK;
1883         }
1884
1885         if (vq->resubmit_inflight)
1886                 return RTE_VHOST_MSG_RESULT_OK;
1887
1888         inflight_split = vq->inflight_split;
1889         vq->global_counter = 0;
1890         last_io = inflight_split->last_inflight_io;
1891
1892         if (inflight_split->used_idx != used->idx) {
1893                 inflight_split->desc[last_io].inflight = 0;
1894                 rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
1895                 inflight_split->used_idx = used->idx;
1896         }
1897
1898         for (i = 0; i < inflight_split->desc_num; i++) {
1899                 if (inflight_split->desc[i].inflight == 1)
1900                         resubmit_num++;
1901         }
1902
1903         vq->last_avail_idx += resubmit_num;
1904
1905         if (resubmit_num) {
1906                 resubmit = rte_zmalloc_socket("resubmit", sizeof(struct rte_vhost_resubmit_info),
1907                                 0, vq->numa_node);
1908                 if (!resubmit) {
1909                         VHOST_LOG_CONFIG(ERR,
1910                                         "(%s) failed to allocate memory for resubmit info.\n",
1911                                         dev->ifname);
1912                         return RTE_VHOST_MSG_RESULT_ERR;
1913                 }
1914
1915                 resubmit->resubmit_list = rte_zmalloc_socket("resubmit_list",
1916                                 resubmit_num * sizeof(struct rte_vhost_resubmit_desc),
1917                                 0, vq->numa_node);
1918                 if (!resubmit->resubmit_list) {
1919                         VHOST_LOG_CONFIG(ERR,
1920                                         "(%s) failed to allocate memory for inflight desc.\n",
1921                                         dev->ifname);
1922                         rte_free(resubmit);
1923                         return RTE_VHOST_MSG_RESULT_ERR;
1924                 }
1925
1926                 num = 0;
1927                 for (i = 0; i < vq->inflight_split->desc_num; i++) {
1928                         if (vq->inflight_split->desc[i].inflight == 1) {
1929                                 resubmit->resubmit_list[num].index = i;
1930                                 resubmit->resubmit_list[num].counter =
1931                                         inflight_split->desc[i].counter;
1932                                 num++;
1933                         }
1934                 }
1935                 resubmit->resubmit_num = num;
1936
1937                 if (resubmit->resubmit_num > 1)
1938                         qsort(resubmit->resubmit_list, resubmit->resubmit_num,
1939                               sizeof(struct rte_vhost_resubmit_desc),
1940                               resubmit_desc_compare);
1941
1942                 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
1943                 vq->resubmit_inflight = resubmit;
1944         }
1945
1946         return RTE_VHOST_MSG_RESULT_OK;
1947 }
1948
1949 static int
1950 vhost_check_queue_inflights_packed(struct virtio_net *dev,
1951                                    struct vhost_virtqueue *vq)
1952 {
1953         uint16_t i;
1954         uint16_t resubmit_num = 0, old_used_idx, num;
1955         struct rte_vhost_resubmit_info *resubmit;
1956         struct rte_vhost_inflight_info_packed *inflight_packed;
1957
1958         if (!(dev->protocol_features &
1959             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1960                 return RTE_VHOST_MSG_RESULT_OK;
1961
1962         /* The frontend may still not support the inflight feature
1963          * although we negotiate the protocol feature.
1964          */
1965         if ((!vq->inflight_packed))
1966                 return RTE_VHOST_MSG_RESULT_OK;
1967
1968         if (!vq->inflight_packed->version) {
1969                 vq->inflight_packed->version = INFLIGHT_VERSION;
1970                 return RTE_VHOST_MSG_RESULT_OK;
1971         }
1972
1973         if (vq->resubmit_inflight)
1974                 return RTE_VHOST_MSG_RESULT_OK;
1975
1976         inflight_packed = vq->inflight_packed;
1977         vq->global_counter = 0;
1978         old_used_idx = inflight_packed->old_used_idx;
1979
1980         if (inflight_packed->used_idx != old_used_idx) {
1981                 if (inflight_packed->desc[old_used_idx].inflight == 0) {
1982                         inflight_packed->old_used_idx =
1983                                 inflight_packed->used_idx;
1984                         inflight_packed->old_used_wrap_counter =
1985                                 inflight_packed->used_wrap_counter;
1986                         inflight_packed->old_free_head =
1987                                 inflight_packed->free_head;
1988                 } else {
1989                         inflight_packed->used_idx =
1990                                 inflight_packed->old_used_idx;
1991                         inflight_packed->used_wrap_counter =
1992                                 inflight_packed->old_used_wrap_counter;
1993                         inflight_packed->free_head =
1994                                 inflight_packed->old_free_head;
1995                 }
1996         }
1997
1998         for (i = 0; i < inflight_packed->desc_num; i++) {
1999                 if (inflight_packed->desc[i].inflight == 1)
2000                         resubmit_num++;
2001         }
2002
2003         if (resubmit_num) {
2004                 resubmit = rte_zmalloc_socket("resubmit", sizeof(struct rte_vhost_resubmit_info),
2005                                 0, vq->numa_node);
2006                 if (resubmit == NULL) {
2007                         VHOST_LOG_CONFIG(ERR,
2008                                         "(%s) failed to allocate memory for resubmit info.\n",
2009                                         dev->ifname);
2010                         return RTE_VHOST_MSG_RESULT_ERR;
2011                 }
2012
2013                 resubmit->resubmit_list = rte_zmalloc_socket("resubmit_list",
2014                                 resubmit_num * sizeof(struct rte_vhost_resubmit_desc),
2015                                 0, vq->numa_node);
2016                 if (resubmit->resubmit_list == NULL) {
2017                         VHOST_LOG_CONFIG(ERR,
2018                                         "(%s) failed to allocate memory for resubmit desc.\n",
2019                                         dev->ifname);
2020                         rte_free(resubmit);
2021                         return RTE_VHOST_MSG_RESULT_ERR;
2022                 }
2023
2024                 num = 0;
2025                 for (i = 0; i < inflight_packed->desc_num; i++) {
2026                         if (vq->inflight_packed->desc[i].inflight == 1) {
2027                                 resubmit->resubmit_list[num].index = i;
2028                                 resubmit->resubmit_list[num].counter =
2029                                         inflight_packed->desc[i].counter;
2030                                 num++;
2031                         }
2032                 }
2033                 resubmit->resubmit_num = num;
2034
2035                 if (resubmit->resubmit_num > 1)
2036                         qsort(resubmit->resubmit_list, resubmit->resubmit_num,
2037                               sizeof(struct rte_vhost_resubmit_desc),
2038                               resubmit_desc_compare);
2039
2040                 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
2041                 vq->resubmit_inflight = resubmit;
2042         }
2043
2044         return RTE_VHOST_MSG_RESULT_OK;
2045 }
2046
2047 static int
2048 vhost_user_set_vring_kick(struct virtio_net **pdev,
2049                         struct vhu_msg_context *ctx,
2050                         int main_fd __rte_unused)
2051 {
2052         struct virtio_net *dev = *pdev;
2053         struct vhost_vring_file file;
2054         struct vhost_virtqueue *vq;
2055         int expected_fds;
2056
2057         expected_fds = (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
2058         if (validate_msg_fds(dev, ctx, expected_fds) != 0)
2059                 return RTE_VHOST_MSG_RESULT_ERR;
2060
2061         file.index = ctx->msg.payload.u64 & VHOST_USER_VRING_IDX_MASK;
2062         if (ctx->msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK)
2063                 file.fd = VIRTIO_INVALID_EVENTFD;
2064         else
2065                 file.fd = ctx->fds[0];
2066         VHOST_LOG_CONFIG(INFO, "(%s) vring kick idx:%d file:%d\n",
2067                         dev->ifname, file.index, file.fd);
2068
2069         /* Interpret ring addresses only when ring is started. */
2070         dev = translate_ring_addresses(dev, file.index);
2071         if (!dev) {
2072                 if (file.fd != VIRTIO_INVALID_EVENTFD)
2073                         close(file.fd);
2074
2075                 return RTE_VHOST_MSG_RESULT_ERR;
2076         }
2077
2078         *pdev = dev;
2079
2080         vq = dev->virtqueue[file.index];
2081
2082         /*
2083          * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
2084          * the ring starts already enabled. Otherwise, it is enabled via
2085          * the SET_VRING_ENABLE message.
2086          */
2087         if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
2088                 vq->enabled = true;
2089         }
2090
2091         if (vq->ready) {
2092                 vq->ready = false;
2093                 vhost_user_notify_queue_state(dev, file.index, 0);
2094         }
2095
2096         if (vq->kickfd >= 0)
2097                 close(vq->kickfd);
2098         vq->kickfd = file.fd;
2099
2100         if (vq_is_packed(dev)) {
2101                 if (vhost_check_queue_inflights_packed(dev, vq)) {
2102                         VHOST_LOG_CONFIG(ERR, "(%s) failed to inflights for vq: %d\n",
2103                                         dev->ifname, file.index);
2104                         return RTE_VHOST_MSG_RESULT_ERR;
2105                 }
2106         } else {
2107                 if (vhost_check_queue_inflights_split(dev, vq)) {
2108                         VHOST_LOG_CONFIG(ERR, "(%s) failed to inflights for vq: %d\n",
2109                                         dev->ifname, file.index);
2110                         return RTE_VHOST_MSG_RESULT_ERR;
2111                 }
2112         }
2113
2114         return RTE_VHOST_MSG_RESULT_OK;
2115 }
2116
2117 /*
2118  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
2119  */
2120 static int
2121 vhost_user_get_vring_base(struct virtio_net **pdev,
2122                         struct vhu_msg_context *ctx,
2123                         int main_fd __rte_unused)
2124 {
2125         struct virtio_net *dev = *pdev;
2126         struct vhost_virtqueue *vq = dev->virtqueue[ctx->msg.payload.state.index];
2127         uint64_t val;
2128
2129         if (validate_msg_fds(dev, ctx, 0) != 0)
2130                 return RTE_VHOST_MSG_RESULT_ERR;
2131
2132         /* We have to stop the queue (virtio) if it is running. */
2133         vhost_destroy_device_notify(dev);
2134
2135         dev->flags &= ~VIRTIO_DEV_READY;
2136         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
2137
2138         /* Here we are safe to get the indexes */
2139         if (vq_is_packed(dev)) {
2140                 /*
2141                  * Bit[0:14]: avail index
2142                  * Bit[15]: avail wrap counter
2143                  */
2144                 val = vq->last_avail_idx & 0x7fff;
2145                 val |= vq->avail_wrap_counter << 15;
2146                 ctx->msg.payload.state.num = val;
2147         } else {
2148                 ctx->msg.payload.state.num = vq->last_avail_idx;
2149         }
2150
2151         VHOST_LOG_CONFIG(INFO, "(%s) vring base idx:%d file:%d\n",
2152                         dev->ifname, ctx->msg.payload.state.index,
2153                         ctx->msg.payload.state.num);
2154         /*
2155          * Based on current qemu vhost-user implementation, this message is
2156          * sent and only sent in vhost_vring_stop.
2157          * TODO: cleanup the vring, it isn't usable since here.
2158          */
2159         if (vq->kickfd >= 0)
2160                 close(vq->kickfd);
2161
2162         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
2163
2164         if (vq->callfd >= 0)
2165                 close(vq->callfd);
2166
2167         vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
2168
2169         vq->signalled_used_valid = false;
2170
2171         if (vq_is_packed(dev)) {
2172                 rte_free(vq->shadow_used_packed);
2173                 vq->shadow_used_packed = NULL;
2174         } else {
2175                 rte_free(vq->shadow_used_split);
2176                 vq->shadow_used_split = NULL;
2177         }
2178
2179         rte_free(vq->batch_copy_elems);
2180         vq->batch_copy_elems = NULL;
2181
2182         rte_free(vq->log_cache);
2183         vq->log_cache = NULL;
2184
2185         ctx->msg.size = sizeof(ctx->msg.payload.state);
2186         ctx->fd_num = 0;
2187
2188         vhost_user_iotlb_flush_all(vq);
2189
2190         vring_invalidate(dev, vq);
2191
2192         return RTE_VHOST_MSG_RESULT_REPLY;
2193 }
2194
2195 /*
2196  * when virtio queues are ready to work, qemu will send us to
2197  * enable the virtio queue pair.
2198  */
2199 static int
2200 vhost_user_set_vring_enable(struct virtio_net **pdev,
2201                         struct vhu_msg_context *ctx,
2202                         int main_fd __rte_unused)
2203 {
2204         struct virtio_net *dev = *pdev;
2205         bool enable = !!ctx->msg.payload.state.num;
2206         int index = (int)ctx->msg.payload.state.index;
2207
2208         if (validate_msg_fds(dev, ctx, 0) != 0)
2209                 return RTE_VHOST_MSG_RESULT_ERR;
2210
2211         VHOST_LOG_CONFIG(INFO, "(%s) set queue enable: %d to qp idx: %d\n",
2212                         dev->ifname, enable, index);
2213
2214         if (enable && dev->virtqueue[index]->async) {
2215                 if (dev->virtqueue[index]->async->pkts_inflight_n) {
2216                         VHOST_LOG_CONFIG(ERR,
2217                                 "(%s) failed to enable vring. Inflight packets must be completed first\n",
2218                                 dev->ifname);
2219                         return RTE_VHOST_MSG_RESULT_ERR;
2220                 }
2221         }
2222
2223         dev->virtqueue[index]->enabled = enable;
2224
2225         return RTE_VHOST_MSG_RESULT_OK;
2226 }
2227
2228 static int
2229 vhost_user_get_protocol_features(struct virtio_net **pdev,
2230                         struct vhu_msg_context *ctx,
2231                         int main_fd __rte_unused)
2232 {
2233         struct virtio_net *dev = *pdev;
2234         uint64_t features, protocol_features;
2235
2236         if (validate_msg_fds(dev, ctx, 0) != 0)
2237                 return RTE_VHOST_MSG_RESULT_ERR;
2238
2239         rte_vhost_driver_get_features(dev->ifname, &features);
2240         rte_vhost_driver_get_protocol_features(dev->ifname, &protocol_features);
2241
2242         ctx->msg.payload.u64 = protocol_features;
2243         ctx->msg.size = sizeof(ctx->msg.payload.u64);
2244         ctx->fd_num = 0;
2245
2246         return RTE_VHOST_MSG_RESULT_REPLY;
2247 }
2248
2249 static int
2250 vhost_user_set_protocol_features(struct virtio_net **pdev,
2251                         struct vhu_msg_context *ctx,
2252                         int main_fd __rte_unused)
2253 {
2254         struct virtio_net *dev = *pdev;
2255         uint64_t protocol_features = ctx->msg.payload.u64;
2256         uint64_t slave_protocol_features = 0;
2257
2258         if (validate_msg_fds(dev, ctx, 0) != 0)
2259                 return RTE_VHOST_MSG_RESULT_ERR;
2260
2261         rte_vhost_driver_get_protocol_features(dev->ifname,
2262                         &slave_protocol_features);
2263         if (protocol_features & ~slave_protocol_features) {
2264                 VHOST_LOG_CONFIG(ERR, "(%s) received invalid protocol features.\n", dev->ifname);
2265                 return RTE_VHOST_MSG_RESULT_ERR;
2266         }
2267
2268         dev->protocol_features = protocol_features;
2269         VHOST_LOG_CONFIG(INFO, "(%s) negotiated Vhost-user protocol features: 0x%" PRIx64 "\n",
2270                 dev->ifname, dev->protocol_features);
2271
2272         return RTE_VHOST_MSG_RESULT_OK;
2273 }
2274
2275 static int
2276 vhost_user_set_log_base(struct virtio_net **pdev,
2277                         struct vhu_msg_context *ctx,
2278                         int main_fd __rte_unused)
2279 {
2280         struct virtio_net *dev = *pdev;
2281         int fd = ctx->fds[0];
2282         uint64_t size, off;
2283         void *addr;
2284         uint32_t i;
2285
2286         if (validate_msg_fds(dev, ctx, 1) != 0)
2287                 return RTE_VHOST_MSG_RESULT_ERR;
2288
2289         if (fd < 0) {
2290                 VHOST_LOG_CONFIG(ERR, "(%s) invalid log fd: %d\n", dev->ifname, fd);
2291                 return RTE_VHOST_MSG_RESULT_ERR;
2292         }
2293
2294         if (ctx->msg.size != sizeof(VhostUserLog)) {
2295                 VHOST_LOG_CONFIG(ERR, "(%s) invalid log base msg size: %"PRId32" != %d\n",
2296                         dev->ifname, ctx->msg.size, (int)sizeof(VhostUserLog));
2297                 goto close_msg_fds;
2298         }
2299
2300         size = ctx->msg.payload.log.mmap_size;
2301         off  = ctx->msg.payload.log.mmap_offset;
2302
2303         /* Check for mmap size and offset overflow. */
2304         if (off >= -size) {
2305                 VHOST_LOG_CONFIG(ERR,
2306                                 "(%s) log offset %#"PRIx64" and log size %#"PRIx64" overflow\n",
2307                                 dev->ifname, off, size);
2308                 goto close_msg_fds;
2309         }
2310
2311         VHOST_LOG_CONFIG(INFO, "(%s) log mmap size: %"PRId64", offset: %"PRId64"\n",
2312                         dev->ifname, size, off);
2313
2314         /*
2315          * mmap from 0 to workaround a hugepage mmap bug: mmap will
2316          * fail when offset is not page size aligned.
2317          */
2318         addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
2319         close(fd);
2320         if (addr == MAP_FAILED) {
2321                 VHOST_LOG_CONFIG(ERR, "(%s) mmap log base failed!\n", dev->ifname);
2322                 return RTE_VHOST_MSG_RESULT_ERR;
2323         }
2324
2325         /*
2326          * Free previously mapped log memory on occasionally
2327          * multiple VHOST_USER_SET_LOG_BASE.
2328          */
2329         if (dev->log_addr) {
2330                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
2331         }
2332         dev->log_addr = (uint64_t)(uintptr_t)addr;
2333         dev->log_base = dev->log_addr + off;
2334         dev->log_size = size;
2335
2336         for (i = 0; i < dev->nr_vring; i++) {
2337                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2338
2339                 rte_free(vq->log_cache);
2340                 vq->log_cache = NULL;
2341                 vq->log_cache_nb_elem = 0;
2342                 vq->log_cache = rte_malloc_socket("vq log cache",
2343                                 sizeof(struct log_cache_entry) * VHOST_LOG_CACHE_NR,
2344                                 0, vq->numa_node);
2345                 /*
2346                  * If log cache alloc fail, don't fail migration, but no
2347                  * caching will be done, which will impact performance
2348                  */
2349                 if (!vq->log_cache)
2350                         VHOST_LOG_CONFIG(ERR, "(%s) failed to allocate VQ logging cache\n",
2351                                         dev->ifname);
2352         }
2353
2354         /*
2355          * The spec is not clear about it (yet), but QEMU doesn't expect
2356          * any payload in the reply.
2357          */
2358         ctx->msg.size = 0;
2359         ctx->fd_num = 0;
2360
2361         return RTE_VHOST_MSG_RESULT_REPLY;
2362
2363 close_msg_fds:
2364         close_msg_fds(ctx);
2365         return RTE_VHOST_MSG_RESULT_ERR;
2366 }
2367
2368 static int vhost_user_set_log_fd(struct virtio_net **pdev,
2369                         struct vhu_msg_context *ctx,
2370                         int main_fd __rte_unused)
2371 {
2372         struct virtio_net *dev = *pdev;
2373
2374         if (validate_msg_fds(dev, ctx, 1) != 0)
2375                 return RTE_VHOST_MSG_RESULT_ERR;
2376
2377         close(ctx->fds[0]);
2378         VHOST_LOG_CONFIG(INFO, "(%s) not implemented.\n", dev->ifname);
2379
2380         return RTE_VHOST_MSG_RESULT_OK;
2381 }
2382
2383 /*
2384  * An rarp packet is constructed and broadcasted to notify switches about
2385  * the new location of the migrated VM, so that packets from outside will
2386  * not be lost after migration.
2387  *
2388  * However, we don't actually "send" a rarp packet here, instead, we set
2389  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
2390  */
2391 static int
2392 vhost_user_send_rarp(struct virtio_net **pdev,
2393                         struct vhu_msg_context *ctx,
2394                         int main_fd __rte_unused)
2395 {
2396         struct virtio_net *dev = *pdev;
2397         uint8_t *mac = (uint8_t *)&ctx->msg.payload.u64;
2398         struct rte_vdpa_device *vdpa_dev;
2399
2400         if (validate_msg_fds(dev, ctx, 0) != 0)
2401                 return RTE_VHOST_MSG_RESULT_ERR;
2402
2403         VHOST_LOG_CONFIG(DEBUG, "(%s) MAC: " RTE_ETHER_ADDR_PRT_FMT "\n",
2404                 dev->ifname, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
2405         memcpy(dev->mac.addr_bytes, mac, 6);
2406
2407         /*
2408          * Set the flag to inject a RARP broadcast packet at
2409          * rte_vhost_dequeue_burst().
2410          *
2411          * __ATOMIC_RELEASE ordering is for making sure the mac is
2412          * copied before the flag is set.
2413          */
2414         __atomic_store_n(&dev->broadcast_rarp, 1, __ATOMIC_RELEASE);
2415         vdpa_dev = dev->vdpa_dev;
2416         if (vdpa_dev && vdpa_dev->ops->migration_done)
2417                 vdpa_dev->ops->migration_done(dev->vid);
2418
2419         return RTE_VHOST_MSG_RESULT_OK;
2420 }
2421
2422 static int
2423 vhost_user_net_set_mtu(struct virtio_net **pdev,
2424                         struct vhu_msg_context *ctx,
2425                         int main_fd __rte_unused)
2426 {
2427         struct virtio_net *dev = *pdev;
2428
2429         if (validate_msg_fds(dev, ctx, 0) != 0)
2430                 return RTE_VHOST_MSG_RESULT_ERR;
2431
2432         if (ctx->msg.payload.u64 < VIRTIO_MIN_MTU ||
2433                         ctx->msg.payload.u64 > VIRTIO_MAX_MTU) {
2434                 VHOST_LOG_CONFIG(ERR, "(%s) invalid MTU size (%"PRIu64")\n",
2435                                 dev->ifname, ctx->msg.payload.u64);
2436
2437                 return RTE_VHOST_MSG_RESULT_ERR;
2438         }
2439
2440         dev->mtu = ctx->msg.payload.u64;
2441
2442         return RTE_VHOST_MSG_RESULT_OK;
2443 }
2444
2445 static int
2446 vhost_user_set_req_fd(struct virtio_net **pdev,
2447                         struct vhu_msg_context *ctx,
2448                         int main_fd __rte_unused)
2449 {
2450         struct virtio_net *dev = *pdev;
2451         int fd = ctx->fds[0];
2452
2453         if (validate_msg_fds(dev, ctx, 1) != 0)
2454                 return RTE_VHOST_MSG_RESULT_ERR;
2455
2456         if (fd < 0) {
2457                 VHOST_LOG_CONFIG(ERR, "(%s) invalid file descriptor for slave channel (%d)\n",
2458                                 dev->ifname, fd);
2459                 return RTE_VHOST_MSG_RESULT_ERR;
2460         }
2461
2462         if (dev->slave_req_fd >= 0)
2463                 close(dev->slave_req_fd);
2464
2465         dev->slave_req_fd = fd;
2466
2467         return RTE_VHOST_MSG_RESULT_OK;
2468 }
2469
2470 static int
2471 is_vring_iotlb_split(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2472 {
2473         struct vhost_vring_addr *ra;
2474         uint64_t start, end, len;
2475
2476         start = imsg->iova;
2477         end = start + imsg->size;
2478
2479         ra = &vq->ring_addrs;
2480         len = sizeof(struct vring_desc) * vq->size;
2481         if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2482                 return 1;
2483
2484         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
2485         if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2486                 return 1;
2487
2488         len = sizeof(struct vring_used) +
2489                sizeof(struct vring_used_elem) * vq->size;
2490         if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2491                 return 1;
2492
2493         if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2494                 len = sizeof(uint64_t);
2495                 if (ra->log_guest_addr < end &&
2496                     (ra->log_guest_addr + len) > start)
2497                         return 1;
2498         }
2499
2500         return 0;
2501 }
2502
2503 static int
2504 is_vring_iotlb_packed(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2505 {
2506         struct vhost_vring_addr *ra;
2507         uint64_t start, end, len;
2508
2509         start = imsg->iova;
2510         end = start + imsg->size;
2511
2512         ra = &vq->ring_addrs;
2513         len = sizeof(struct vring_packed_desc) * vq->size;
2514         if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2515                 return 1;
2516
2517         len = sizeof(struct vring_packed_desc_event);
2518         if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2519                 return 1;
2520
2521         len = sizeof(struct vring_packed_desc_event);
2522         if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2523                 return 1;
2524
2525         if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2526                 len = sizeof(uint64_t);
2527                 if (ra->log_guest_addr < end &&
2528                     (ra->log_guest_addr + len) > start)
2529                         return 1;
2530         }
2531
2532         return 0;
2533 }
2534
2535 static int is_vring_iotlb(struct virtio_net *dev,
2536                           struct vhost_virtqueue *vq,
2537                           struct vhost_iotlb_msg *imsg)
2538 {
2539         if (vq_is_packed(dev))
2540                 return is_vring_iotlb_packed(vq, imsg);
2541         else
2542                 return is_vring_iotlb_split(vq, imsg);
2543 }
2544
2545 static int
2546 vhost_user_iotlb_msg(struct virtio_net **pdev,
2547                         struct vhu_msg_context *ctx,
2548                         int main_fd __rte_unused)
2549 {
2550         struct virtio_net *dev = *pdev;
2551         struct vhost_iotlb_msg *imsg = &ctx->msg.payload.iotlb;
2552         uint16_t i;
2553         uint64_t vva, len;
2554
2555         if (validate_msg_fds(dev, ctx, 0) != 0)
2556                 return RTE_VHOST_MSG_RESULT_ERR;
2557
2558         switch (imsg->type) {
2559         case VHOST_IOTLB_UPDATE:
2560                 len = imsg->size;
2561                 vva = qva_to_vva(dev, imsg->uaddr, &len);
2562                 if (!vva)
2563                         return RTE_VHOST_MSG_RESULT_ERR;
2564
2565                 for (i = 0; i < dev->nr_vring; i++) {
2566                         struct vhost_virtqueue *vq = dev->virtqueue[i];
2567
2568                         if (!vq)
2569                                 continue;
2570
2571                         vhost_user_iotlb_cache_insert(dev, vq, imsg->iova, vva,
2572                                         len, imsg->perm);
2573
2574                         if (is_vring_iotlb(dev, vq, imsg))
2575                                 *pdev = dev = translate_ring_addresses(dev, i);
2576                 }
2577                 break;
2578         case VHOST_IOTLB_INVALIDATE:
2579                 for (i = 0; i < dev->nr_vring; i++) {
2580                         struct vhost_virtqueue *vq = dev->virtqueue[i];
2581
2582                         if (!vq)
2583                                 continue;
2584
2585                         vhost_user_iotlb_cache_remove(vq, imsg->iova,
2586                                         imsg->size);
2587
2588                         if (is_vring_iotlb(dev, vq, imsg))
2589                                 vring_invalidate(dev, vq);
2590                 }
2591                 break;
2592         default:
2593                 VHOST_LOG_CONFIG(ERR, "(%s) invalid IOTLB message type (%d)\n",
2594                                 dev->ifname, imsg->type);
2595                 return RTE_VHOST_MSG_RESULT_ERR;
2596         }
2597
2598         return RTE_VHOST_MSG_RESULT_OK;
2599 }
2600
2601 static int
2602 vhost_user_set_postcopy_advise(struct virtio_net **pdev,
2603                         struct vhu_msg_context *ctx,
2604                         int main_fd __rte_unused)
2605 {
2606         struct virtio_net *dev = *pdev;
2607 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
2608         struct uffdio_api api_struct;
2609
2610         if (validate_msg_fds(dev, ctx, 0) != 0)
2611                 return RTE_VHOST_MSG_RESULT_ERR;
2612
2613         dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
2614
2615         if (dev->postcopy_ufd == -1) {
2616                 VHOST_LOG_CONFIG(ERR, "(%s) userfaultfd not available: %s\n",
2617                         dev->ifname, strerror(errno));
2618                 return RTE_VHOST_MSG_RESULT_ERR;
2619         }
2620         api_struct.api = UFFD_API;
2621         api_struct.features = 0;
2622         if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) {
2623                 VHOST_LOG_CONFIG(ERR, "(%s) UFFDIO_API ioctl failure: %s\n",
2624                         dev->ifname, strerror(errno));
2625                 close(dev->postcopy_ufd);
2626                 dev->postcopy_ufd = -1;
2627                 return RTE_VHOST_MSG_RESULT_ERR;
2628         }
2629         ctx->fds[0] = dev->postcopy_ufd;
2630         ctx->fd_num = 1;
2631
2632         return RTE_VHOST_MSG_RESULT_REPLY;
2633 #else
2634         dev->postcopy_ufd = -1;
2635         ctx->fd_num = 0;
2636
2637         return RTE_VHOST_MSG_RESULT_ERR;
2638 #endif
2639 }
2640
2641 static int
2642 vhost_user_set_postcopy_listen(struct virtio_net **pdev,
2643                         struct vhu_msg_context *ctx __rte_unused,
2644                         int main_fd __rte_unused)
2645 {
2646         struct virtio_net *dev = *pdev;
2647
2648         if (validate_msg_fds(dev, ctx, 0) != 0)
2649                 return RTE_VHOST_MSG_RESULT_ERR;
2650
2651         if (dev->mem && dev->mem->nregions) {
2652                 VHOST_LOG_CONFIG(ERR, "(%s) regions already registered at postcopy-listen\n",
2653                                 dev->ifname);
2654                 return RTE_VHOST_MSG_RESULT_ERR;
2655         }
2656         dev->postcopy_listening = 1;
2657
2658         return RTE_VHOST_MSG_RESULT_OK;
2659 }
2660
2661 static int
2662 vhost_user_postcopy_end(struct virtio_net **pdev,
2663                         struct vhu_msg_context *ctx,
2664                         int main_fd __rte_unused)
2665 {
2666         struct virtio_net *dev = *pdev;
2667
2668         if (validate_msg_fds(dev, ctx, 0) != 0)
2669                 return RTE_VHOST_MSG_RESULT_ERR;
2670
2671         dev->postcopy_listening = 0;
2672         if (dev->postcopy_ufd >= 0) {
2673                 close(dev->postcopy_ufd);
2674                 dev->postcopy_ufd = -1;
2675         }
2676
2677         ctx->msg.payload.u64 = 0;
2678         ctx->msg.size = sizeof(ctx->msg.payload.u64);
2679         ctx->fd_num = 0;
2680
2681         return RTE_VHOST_MSG_RESULT_REPLY;
2682 }
2683
2684 static int
2685 vhost_user_get_status(struct virtio_net **pdev,
2686                       struct vhu_msg_context *ctx,
2687                       int main_fd __rte_unused)
2688 {
2689         struct virtio_net *dev = *pdev;
2690
2691         if (validate_msg_fds(dev, ctx, 0) != 0)
2692                 return RTE_VHOST_MSG_RESULT_ERR;
2693
2694         ctx->msg.payload.u64 = dev->status;
2695         ctx->msg.size = sizeof(ctx->msg.payload.u64);
2696         ctx->fd_num = 0;
2697
2698         return RTE_VHOST_MSG_RESULT_REPLY;
2699 }
2700
2701 static int
2702 vhost_user_set_status(struct virtio_net **pdev,
2703                         struct vhu_msg_context *ctx,
2704                         int main_fd __rte_unused)
2705 {
2706         struct virtio_net *dev = *pdev;
2707
2708         if (validate_msg_fds(dev, ctx, 0) != 0)
2709                 return RTE_VHOST_MSG_RESULT_ERR;
2710
2711         /* As per Virtio specification, the device status is 8bits long */
2712         if (ctx->msg.payload.u64 > UINT8_MAX) {
2713                 VHOST_LOG_CONFIG(ERR, "(%s) invalid VHOST_USER_SET_STATUS payload 0x%" PRIx64 "\n",
2714                                 dev->ifname, ctx->msg.payload.u64);
2715                 return RTE_VHOST_MSG_RESULT_ERR;
2716         }
2717
2718         dev->status = ctx->msg.payload.u64;
2719
2720         if ((dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK) &&
2721             (dev->flags & VIRTIO_DEV_FEATURES_FAILED)) {
2722                 VHOST_LOG_CONFIG(ERR,
2723                                 "(%s) FEATURES_OK bit is set but feature negotiation failed\n",
2724                                 dev->ifname);
2725                 /*
2726                  * Clear the bit to let the driver know about the feature
2727                  * negotiation failure
2728                  */
2729                 dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK;
2730         }
2731
2732         VHOST_LOG_CONFIG(INFO, "(%s) new device status(0x%08x):\n", dev->ifname,
2733                         dev->status);
2734         VHOST_LOG_CONFIG(INFO, "(%s)\t-RESET: %u\n", dev->ifname,
2735                         (dev->status == VIRTIO_DEVICE_STATUS_RESET));
2736         VHOST_LOG_CONFIG(INFO, "(%s)\t-ACKNOWLEDGE: %u\n", dev->ifname,
2737                         !!(dev->status & VIRTIO_DEVICE_STATUS_ACK));
2738         VHOST_LOG_CONFIG(INFO, "(%s)\t-DRIVER: %u\n", dev->ifname,
2739                         !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER));
2740         VHOST_LOG_CONFIG(INFO, "(%s)\t-FEATURES_OK: %u\n", dev->ifname,
2741                         !!(dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK));
2742         VHOST_LOG_CONFIG(INFO, "(%s)\t-DRIVER_OK: %u\n", dev->ifname,
2743                         !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK));
2744         VHOST_LOG_CONFIG(INFO, "(%s)\t-DEVICE_NEED_RESET: %u\n", dev->ifname,
2745                         !!(dev->status & VIRTIO_DEVICE_STATUS_DEV_NEED_RESET));
2746         VHOST_LOG_CONFIG(INFO, "(%s)\t-FAILED: %u\n", dev->ifname,
2747                         !!(dev->status & VIRTIO_DEVICE_STATUS_FAILED));
2748
2749         return RTE_VHOST_MSG_RESULT_OK;
2750 }
2751
2752 typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
2753                                         struct vhu_msg_context *ctx,
2754                                         int main_fd);
2755
2756 static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = {
2757         [VHOST_USER_NONE] = NULL,
2758         [VHOST_USER_GET_FEATURES] = vhost_user_get_features,
2759         [VHOST_USER_SET_FEATURES] = vhost_user_set_features,
2760         [VHOST_USER_SET_OWNER] = vhost_user_set_owner,
2761         [VHOST_USER_RESET_OWNER] = vhost_user_reset_owner,
2762         [VHOST_USER_SET_MEM_TABLE] = vhost_user_set_mem_table,
2763         [VHOST_USER_SET_LOG_BASE] = vhost_user_set_log_base,
2764         [VHOST_USER_SET_LOG_FD] = vhost_user_set_log_fd,
2765         [VHOST_USER_SET_VRING_NUM] = vhost_user_set_vring_num,
2766         [VHOST_USER_SET_VRING_ADDR] = vhost_user_set_vring_addr,
2767         [VHOST_USER_SET_VRING_BASE] = vhost_user_set_vring_base,
2768         [VHOST_USER_GET_VRING_BASE] = vhost_user_get_vring_base,
2769         [VHOST_USER_SET_VRING_KICK] = vhost_user_set_vring_kick,
2770         [VHOST_USER_SET_VRING_CALL] = vhost_user_set_vring_call,
2771         [VHOST_USER_SET_VRING_ERR] = vhost_user_set_vring_err,
2772         [VHOST_USER_GET_PROTOCOL_FEATURES] = vhost_user_get_protocol_features,
2773         [VHOST_USER_SET_PROTOCOL_FEATURES] = vhost_user_set_protocol_features,
2774         [VHOST_USER_GET_QUEUE_NUM] = vhost_user_get_queue_num,
2775         [VHOST_USER_SET_VRING_ENABLE] = vhost_user_set_vring_enable,
2776         [VHOST_USER_SEND_RARP] = vhost_user_send_rarp,
2777         [VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
2778         [VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
2779         [VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
2780         [VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
2781         [VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
2782         [VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
2783         [VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd,
2784         [VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd,
2785         [VHOST_USER_SET_STATUS] = vhost_user_set_status,
2786         [VHOST_USER_GET_STATUS] = vhost_user_get_status,
2787 };
2788
2789 /* return bytes# of read on success or negative val on failure. */
2790 static int
2791 read_vhost_message(struct virtio_net *dev, int sockfd, struct  vhu_msg_context *ctx)
2792 {
2793         int ret;
2794
2795         ret = read_fd_message(dev->ifname, sockfd, (char *)&ctx->msg, VHOST_USER_HDR_SIZE,
2796                 ctx->fds, VHOST_MEMORY_MAX_NREGIONS, &ctx->fd_num);
2797         if (ret <= 0) {
2798                 return ret;
2799         } else if (ret != VHOST_USER_HDR_SIZE) {
2800                 VHOST_LOG_CONFIG(ERR, "(%s) Unexpected header size read\n", dev->ifname);
2801                 close_msg_fds(ctx);
2802                 return -1;
2803         }
2804
2805         if (ctx->msg.size) {
2806                 if (ctx->msg.size > sizeof(ctx->msg.payload)) {
2807                         VHOST_LOG_CONFIG(ERR, "(%s) invalid msg size: %d\n",
2808                                         dev->ifname, ctx->msg.size);
2809                         return -1;
2810                 }
2811                 ret = read(sockfd, &ctx->msg.payload, ctx->msg.size);
2812                 if (ret <= 0)
2813                         return ret;
2814                 if (ret != (int)ctx->msg.size) {
2815                         VHOST_LOG_CONFIG(ERR, "(%s) read control message failed\n", dev->ifname);
2816                         return -1;
2817                 }
2818         }
2819
2820         return ret;
2821 }
2822
2823 static int
2824 send_vhost_message(struct virtio_net *dev, int sockfd, struct vhu_msg_context *ctx)
2825 {
2826         if (!ctx)
2827                 return 0;
2828
2829         return send_fd_message(dev->ifname, sockfd, (char *)&ctx->msg,
2830                 VHOST_USER_HDR_SIZE + ctx->msg.size, ctx->fds, ctx->fd_num);
2831 }
2832
2833 static int
2834 send_vhost_reply(struct virtio_net *dev, int sockfd, struct vhu_msg_context *ctx)
2835 {
2836         if (!ctx)
2837                 return 0;
2838
2839         ctx->msg.flags &= ~VHOST_USER_VERSION_MASK;
2840         ctx->msg.flags &= ~VHOST_USER_NEED_REPLY;
2841         ctx->msg.flags |= VHOST_USER_VERSION;
2842         ctx->msg.flags |= VHOST_USER_REPLY_MASK;
2843
2844         return send_vhost_message(dev, sockfd, ctx);
2845 }
2846
2847 static int
2848 send_vhost_slave_message(struct virtio_net *dev,
2849                 struct vhu_msg_context *ctx)
2850 {
2851         int ret;
2852
2853         if (ctx->msg.flags & VHOST_USER_NEED_REPLY)
2854                 rte_spinlock_lock(&dev->slave_req_lock);
2855
2856         ret = send_vhost_message(dev, dev->slave_req_fd, ctx);
2857         if (ret < 0 && (ctx->msg.flags & VHOST_USER_NEED_REPLY))
2858                 rte_spinlock_unlock(&dev->slave_req_lock);
2859
2860         return ret;
2861 }
2862
2863 /*
2864  * Allocate a queue pair if it hasn't been allocated yet
2865  */
2866 static int
2867 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
2868                         struct vhu_msg_context *ctx)
2869 {
2870         uint32_t vring_idx;
2871
2872         switch (ctx->msg.request.master) {
2873         case VHOST_USER_SET_VRING_KICK:
2874         case VHOST_USER_SET_VRING_CALL:
2875         case VHOST_USER_SET_VRING_ERR:
2876                 vring_idx = ctx->msg.payload.u64 & VHOST_USER_VRING_IDX_MASK;
2877                 break;
2878         case VHOST_USER_SET_VRING_NUM:
2879         case VHOST_USER_SET_VRING_BASE:
2880         case VHOST_USER_GET_VRING_BASE:
2881         case VHOST_USER_SET_VRING_ENABLE:
2882                 vring_idx = ctx->msg.payload.state.index;
2883                 break;
2884         case VHOST_USER_SET_VRING_ADDR:
2885                 vring_idx = ctx->msg.payload.addr.index;
2886                 break;
2887         default:
2888                 return 0;
2889         }
2890
2891         if (vring_idx >= VHOST_MAX_VRING) {
2892                 VHOST_LOG_CONFIG(ERR, "(%s) invalid vring index: %u\n", dev->ifname, vring_idx);
2893                 return -1;
2894         }
2895
2896         if (dev->virtqueue[vring_idx])
2897                 return 0;
2898
2899         return alloc_vring_queue(dev, vring_idx);
2900 }
2901
2902 static void
2903 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
2904 {
2905         unsigned int i = 0;
2906         unsigned int vq_num = 0;
2907
2908         while (vq_num < dev->nr_vring) {
2909                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2910
2911                 if (vq) {
2912                         rte_spinlock_lock(&vq->access_lock);
2913                         vq_num++;
2914                 }
2915                 i++;
2916         }
2917 }
2918
2919 static void
2920 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
2921 {
2922         unsigned int i = 0;
2923         unsigned int vq_num = 0;
2924
2925         while (vq_num < dev->nr_vring) {
2926                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2927
2928                 if (vq) {
2929                         rte_spinlock_unlock(&vq->access_lock);
2930                         vq_num++;
2931                 }
2932                 i++;
2933         }
2934 }
2935
2936 int
2937 vhost_user_msg_handler(int vid, int fd)
2938 {
2939         struct virtio_net *dev;
2940         struct vhu_msg_context ctx;
2941         struct rte_vdpa_device *vdpa_dev;
2942         int ret;
2943         int unlock_required = 0;
2944         bool handled;
2945         int request;
2946         uint32_t i;
2947
2948         dev = get_device(vid);
2949         if (dev == NULL)
2950                 return -1;
2951
2952         if (!dev->notify_ops) {
2953                 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
2954                 if (!dev->notify_ops) {
2955                         VHOST_LOG_CONFIG(ERR, "(%s) failed to get callback ops for driver\n",
2956                                 dev->ifname);
2957                         return -1;
2958                 }
2959         }
2960
2961         ret = read_vhost_message(dev, fd, &ctx);
2962         if (ret <= 0) {
2963                 if (ret < 0)
2964                         VHOST_LOG_CONFIG(ERR, "(%s) vhost read message failed\n", dev->ifname);
2965                 else
2966                         VHOST_LOG_CONFIG(INFO, "(%s) vhost peer closed\n", dev->ifname);
2967
2968                 return -1;
2969         }
2970
2971         ret = 0;
2972         request = ctx.msg.request.master;
2973         if (request > VHOST_USER_NONE && request < VHOST_USER_MAX &&
2974                         vhost_message_str[request]) {
2975                 if (request != VHOST_USER_IOTLB_MSG)
2976                         VHOST_LOG_CONFIG(INFO, "(%s) read message %s\n",
2977                                 dev->ifname, vhost_message_str[request]);
2978                 else
2979                         VHOST_LOG_CONFIG(DEBUG, "(%s) read message %s\n",
2980                                 dev->ifname, vhost_message_str[request]);
2981         } else {
2982                 VHOST_LOG_CONFIG(DEBUG, "(%s) external request %d\n", dev->ifname, request);
2983         }
2984
2985         ret = vhost_user_check_and_alloc_queue_pair(dev, &ctx);
2986         if (ret < 0) {
2987                 VHOST_LOG_CONFIG(ERR, "(%s) failed to alloc queue\n", dev->ifname);
2988                 return -1;
2989         }
2990
2991         /*
2992          * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
2993          * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
2994          * and device is destroyed. destroy_device waits for queues to be
2995          * inactive, so it is safe. Otherwise taking the access_lock
2996          * would cause a dead lock.
2997          */
2998         switch (request) {
2999         case VHOST_USER_SET_FEATURES:
3000         case VHOST_USER_SET_PROTOCOL_FEATURES:
3001         case VHOST_USER_SET_OWNER:
3002         case VHOST_USER_SET_MEM_TABLE:
3003         case VHOST_USER_SET_LOG_BASE:
3004         case VHOST_USER_SET_LOG_FD:
3005         case VHOST_USER_SET_VRING_NUM:
3006         case VHOST_USER_SET_VRING_ADDR:
3007         case VHOST_USER_SET_VRING_BASE:
3008         case VHOST_USER_SET_VRING_KICK:
3009         case VHOST_USER_SET_VRING_CALL:
3010         case VHOST_USER_SET_VRING_ERR:
3011         case VHOST_USER_SET_VRING_ENABLE:
3012         case VHOST_USER_SEND_RARP:
3013         case VHOST_USER_NET_SET_MTU:
3014         case VHOST_USER_SET_SLAVE_REQ_FD:
3015                 if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
3016                         vhost_user_lock_all_queue_pairs(dev);
3017                         unlock_required = 1;
3018                 }
3019                 break;
3020         default:
3021                 break;
3022
3023         }
3024
3025         handled = false;
3026         if (dev->extern_ops.pre_msg_handle) {
3027                 ret = (*dev->extern_ops.pre_msg_handle)(dev->vid,
3028                                 (void *)&ctx.msg);
3029                 switch (ret) {
3030                 case RTE_VHOST_MSG_RESULT_REPLY:
3031                         send_vhost_reply(dev, fd, &ctx);
3032                         /* Fall-through */
3033                 case RTE_VHOST_MSG_RESULT_ERR:
3034                 case RTE_VHOST_MSG_RESULT_OK:
3035                         handled = true;
3036                         goto skip_to_post_handle;
3037                 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
3038                 default:
3039                         break;
3040                 }
3041         }
3042
3043         if (request > VHOST_USER_NONE && request < VHOST_USER_MAX) {
3044                 if (!vhost_message_handlers[request])
3045                         goto skip_to_post_handle;
3046                 ret = vhost_message_handlers[request](&dev, &ctx, fd);
3047
3048                 switch (ret) {
3049                 case RTE_VHOST_MSG_RESULT_ERR:
3050                         VHOST_LOG_CONFIG(ERR, "(%s) processing %s failed.\n",
3051                                         dev->ifname, vhost_message_str[request]);
3052                         handled = true;
3053                         break;
3054                 case RTE_VHOST_MSG_RESULT_OK:
3055                         VHOST_LOG_CONFIG(DEBUG, "(%s) processing %s succeeded.\n",
3056                                         dev->ifname, vhost_message_str[request]);
3057                         handled = true;
3058                         break;
3059                 case RTE_VHOST_MSG_RESULT_REPLY:
3060                         VHOST_LOG_CONFIG(DEBUG, "(%s) processing %s succeeded and needs reply.\n",
3061                                         dev->ifname, vhost_message_str[request]);
3062                         send_vhost_reply(dev, fd, &ctx);
3063                         handled = true;
3064                         break;
3065                 default:
3066                         break;
3067                 }
3068         }
3069
3070 skip_to_post_handle:
3071         if (ret != RTE_VHOST_MSG_RESULT_ERR &&
3072                         dev->extern_ops.post_msg_handle) {
3073                 ret = (*dev->extern_ops.post_msg_handle)(dev->vid,
3074                                 (void *)&ctx.msg);
3075                 switch (ret) {
3076                 case RTE_VHOST_MSG_RESULT_REPLY:
3077                         send_vhost_reply(dev, fd, &ctx);
3078                         /* Fall-through */
3079                 case RTE_VHOST_MSG_RESULT_ERR:
3080                 case RTE_VHOST_MSG_RESULT_OK:
3081                         handled = true;
3082                 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
3083                 default:
3084                         break;
3085                 }
3086         }
3087
3088         /* If message was not handled at this stage, treat it as an error */
3089         if (!handled) {
3090                 VHOST_LOG_CONFIG(ERR, "(%s) vhost message (req: %d) was not handled.\n",
3091                                 dev->ifname, request);
3092                 close_msg_fds(&ctx);
3093                 ret = RTE_VHOST_MSG_RESULT_ERR;
3094         }
3095
3096         /*
3097          * If the request required a reply that was already sent,
3098          * this optional reply-ack won't be sent as the
3099          * VHOST_USER_NEED_REPLY was cleared in send_vhost_reply().
3100          */
3101         if (ctx.msg.flags & VHOST_USER_NEED_REPLY) {
3102                 ctx.msg.payload.u64 = ret == RTE_VHOST_MSG_RESULT_ERR;
3103                 ctx.msg.size = sizeof(ctx.msg.payload.u64);
3104                 ctx.fd_num = 0;
3105                 send_vhost_reply(dev, fd, &ctx);
3106         } else if (ret == RTE_VHOST_MSG_RESULT_ERR) {
3107                 VHOST_LOG_CONFIG(ERR, "(%s) vhost message handling failed.\n", dev->ifname);
3108                 return -1;
3109         }
3110
3111         for (i = 0; i < dev->nr_vring; i++) {
3112                 struct vhost_virtqueue *vq = dev->virtqueue[i];
3113                 bool cur_ready = vq_is_ready(dev, vq);
3114
3115                 if (cur_ready != (vq && vq->ready)) {
3116                         vq->ready = cur_ready;
3117                         vhost_user_notify_queue_state(dev, i, cur_ready);
3118                 }
3119         }
3120
3121         if (unlock_required)
3122                 vhost_user_unlock_all_queue_pairs(dev);
3123
3124         if (!virtio_is_ready(dev))
3125                 goto out;
3126
3127         /*
3128          * Virtio is now ready. If not done already, it is time
3129          * to notify the application it can process the rings and
3130          * configure the vDPA device if present.
3131          */
3132
3133         if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
3134                 if (dev->notify_ops->new_device(dev->vid) == 0)
3135                         dev->flags |= VIRTIO_DEV_RUNNING;
3136         }
3137
3138         vdpa_dev = dev->vdpa_dev;
3139         if (!vdpa_dev)
3140                 goto out;
3141
3142         if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
3143                 if (vdpa_dev->ops->dev_conf(dev->vid))
3144                         VHOST_LOG_CONFIG(ERR, "(%s) failed to configure vDPA device\n",
3145                                         dev->ifname);
3146                 else
3147                         dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
3148         }
3149
3150 out:
3151         return 0;
3152 }
3153
3154 static int process_slave_message_reply(struct virtio_net *dev,
3155                                        const struct vhu_msg_context *ctx)
3156 {
3157         struct vhu_msg_context msg_reply;
3158         int ret;
3159
3160         if ((ctx->msg.flags & VHOST_USER_NEED_REPLY) == 0)
3161                 return 0;
3162
3163         ret = read_vhost_message(dev, dev->slave_req_fd, &msg_reply);
3164         if (ret <= 0) {
3165                 if (ret < 0)
3166                         VHOST_LOG_CONFIG(ERR, "(%s) vhost read slave message reply failed\n",
3167                                         dev->ifname);
3168                 else
3169                         VHOST_LOG_CONFIG(INFO, "(%s) vhost peer closed\n", dev->ifname);
3170                 ret = -1;
3171                 goto out;
3172         }
3173
3174         ret = 0;
3175         if (msg_reply.msg.request.slave != ctx->msg.request.slave) {
3176                 VHOST_LOG_CONFIG(ERR, "(%s) received unexpected msg type (%u), expected %u\n",
3177                                 dev->ifname, msg_reply.msg.request.slave, ctx->msg.request.slave);
3178                 ret = -1;
3179                 goto out;
3180         }
3181
3182         ret = msg_reply.msg.payload.u64 ? -1 : 0;
3183
3184 out:
3185         rte_spinlock_unlock(&dev->slave_req_lock);
3186         return ret;
3187 }
3188
3189 int
3190 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
3191 {
3192         int ret;
3193         struct vhu_msg_context ctx = {
3194                 .msg = {
3195                         .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
3196                         .flags = VHOST_USER_VERSION,
3197                         .size = sizeof(ctx.msg.payload.iotlb),
3198                         .payload.iotlb = {
3199                                 .iova = iova,
3200                                 .perm = perm,
3201                                 .type = VHOST_IOTLB_MISS,
3202                         },
3203                 },
3204         };
3205
3206         ret = send_vhost_message(dev, dev->slave_req_fd, &ctx);
3207         if (ret < 0) {
3208                 VHOST_LOG_CONFIG(ERR, "(%s) failed to send IOTLB miss message (%d)\n",
3209                                 dev->ifname, ret);
3210                 return ret;
3211         }
3212
3213         return 0;
3214 }
3215
3216 static int
3217 vhost_user_slave_config_change(struct virtio_net *dev, bool need_reply)
3218 {
3219         int ret;
3220         struct vhu_msg_context ctx = {
3221                 .msg = {
3222                         .request.slave = VHOST_USER_SLAVE_CONFIG_CHANGE_MSG,
3223                         .flags = VHOST_USER_VERSION,
3224                         .size = 0,
3225                 }
3226         };
3227
3228         if (need_reply)
3229                 ctx.msg.flags |= VHOST_USER_NEED_REPLY;
3230
3231         ret = send_vhost_slave_message(dev, &ctx);
3232         if (ret < 0) {
3233                 VHOST_LOG_CONFIG(ERR, "(%s) failed to send config change (%d)\n",
3234                                 dev->ifname, ret);
3235                 return ret;
3236         }
3237
3238         return process_slave_message_reply(dev, &ctx);
3239 }
3240
3241 int
3242 rte_vhost_slave_config_change(int vid, bool need_reply)
3243 {
3244         struct virtio_net *dev;
3245
3246         dev = get_device(vid);
3247         if (!dev)
3248                 return -ENODEV;
3249
3250         return vhost_user_slave_config_change(dev, need_reply);
3251 }
3252
3253 static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev,
3254                                                     int index, int fd,
3255                                                     uint64_t offset,
3256                                                     uint64_t size)
3257 {
3258         int ret;
3259         struct vhu_msg_context ctx = {
3260                 .msg = {
3261                         .request.slave = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
3262                         .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY,
3263                         .size = sizeof(ctx.msg.payload.area),
3264                         .payload.area = {
3265                                 .u64 = index & VHOST_USER_VRING_IDX_MASK,
3266                                 .size = size,
3267                                 .offset = offset,
3268                         },
3269                 },
3270         };
3271
3272         if (fd < 0)
3273                 ctx.msg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK;
3274         else {
3275                 ctx.fds[0] = fd;
3276                 ctx.fd_num = 1;
3277         }
3278
3279         ret = send_vhost_slave_message(dev, &ctx);
3280         if (ret < 0) {
3281                 VHOST_LOG_CONFIG(ERR, "(%s) failed to set host notifier (%d)\n",
3282                                 dev->ifname, ret);
3283                 return ret;
3284         }
3285
3286         return process_slave_message_reply(dev, &ctx);
3287 }
3288
3289 int rte_vhost_host_notifier_ctrl(int vid, uint16_t qid, bool enable)
3290 {
3291         struct virtio_net *dev;
3292         struct rte_vdpa_device *vdpa_dev;
3293         int vfio_device_fd, ret = 0;
3294         uint64_t offset, size;
3295         unsigned int i, q_start, q_last;
3296
3297         dev = get_device(vid);
3298         if (!dev)
3299                 return -ENODEV;
3300
3301         vdpa_dev = dev->vdpa_dev;
3302         if (vdpa_dev == NULL)
3303                 return -ENODEV;
3304
3305         if (!(dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
3306             !(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) ||
3307             !(dev->protocol_features &
3308                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ)) ||
3309             !(dev->protocol_features &
3310                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) ||
3311             !(dev->protocol_features &
3312                         (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER)))
3313                 return -ENOTSUP;
3314
3315         if (qid == RTE_VHOST_QUEUE_ALL) {
3316                 q_start = 0;
3317                 q_last = dev->nr_vring - 1;
3318         } else {
3319                 if (qid >= dev->nr_vring)
3320                         return -EINVAL;
3321                 q_start = qid;
3322                 q_last = qid;
3323         }
3324
3325         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP);
3326         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP);
3327
3328         vfio_device_fd = vdpa_dev->ops->get_vfio_device_fd(vid);
3329         if (vfio_device_fd < 0)
3330                 return -ENOTSUP;
3331
3332         if (enable) {
3333                 for (i = q_start; i <= q_last; i++) {
3334                         if (vdpa_dev->ops->get_notify_area(vid, i, &offset,
3335                                         &size) < 0) {
3336                                 ret = -ENOTSUP;
3337                                 goto disable;
3338                         }
3339
3340                         if (vhost_user_slave_set_vring_host_notifier(dev, i,
3341                                         vfio_device_fd, offset, size) < 0) {
3342                                 ret = -EFAULT;
3343                                 goto disable;
3344                         }
3345                 }
3346         } else {
3347 disable:
3348                 for (i = q_start; i <= q_last; i++) {
3349                         vhost_user_slave_set_vring_host_notifier(dev, i, -1,
3350                                         0, 0);
3351                 }
3352         }
3353
3354         return ret;
3355 }