lib/librte_vhost/vhost_user.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2018 Intel Corporation
   3  */
   4
   5 /* Security model
   6  * --------------
   7  * The vhost-user protocol connection is an external interface, so it must be
   8  * robust against invalid inputs.
   9  *
  10  * This is important because the vhost-user master is only one step removed
  11  * from the guest.  Malicious guests that have escaped will then launch further
  12  * attacks from the vhost-user master.
  13  *
  14  * Even in deployments where guests are trusted, a bug in the vhost-user master
  15  * can still cause invalid messages to be sent.  Such messages must not
  16  * compromise the stability of the DPDK application by causing crashes, memory
  17  * corruption, or other problematic behavior.
  18  *
  19  * Do not assume received VhostUserMsg fields contain sensible values!
  20  */
  21
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <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
  49 #include "iotlb.h"
  50 #include "vhost.h"
  51 #include "vhost_user.h"
  52
  53 #define VIRTIO_MIN_MTU 68
  54 #define VIRTIO_MAX_MTU 65535
  55
  56 #define INFLIGHT_ALIGNMENT      64
  57 #define INFLIGHT_VERSION        0x1
  58
  59 static const char *vhost_message_str[VHOST_USER_MAX] = {
  60         [VHOST_USER_NONE] = "VHOST_USER_NONE",
  61         [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
  62         [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
  63         [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
  64         [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
  65         [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
  66         [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
  67         [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
  68         [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
  69         [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
  70         [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
  71         [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
  72         [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
  73         [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
  74         [VHOST_USER_SET_VRING_ERR]  = "VHOST_USER_SET_VRING_ERR",
  75         [VHOST_USER_GET_PROTOCOL_FEATURES]  = "VHOST_USER_GET_PROTOCOL_FEATURES",
  76         [VHOST_USER_SET_PROTOCOL_FEATURES]  = "VHOST_USER_SET_PROTOCOL_FEATURES",
  77         [VHOST_USER_GET_QUEUE_NUM]  = "VHOST_USER_GET_QUEUE_NUM",
  78         [VHOST_USER_SET_VRING_ENABLE]  = "VHOST_USER_SET_VRING_ENABLE",
  79         [VHOST_USER_SEND_RARP]  = "VHOST_USER_SEND_RARP",
  80         [VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
  81         [VHOST_USER_SET_SLAVE_REQ_FD]  = "VHOST_USER_SET_SLAVE_REQ_FD",
  82         [VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
  83         [VHOST_USER_CRYPTO_CREATE_SESS] = "VHOST_USER_CRYPTO_CREATE_SESS",
  84         [VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
  85         [VHOST_USER_POSTCOPY_ADVISE]  = "VHOST_USER_POSTCOPY_ADVISE",
  86         [VHOST_USER_POSTCOPY_LISTEN]  = "VHOST_USER_POSTCOPY_LISTEN",
  87         [VHOST_USER_POSTCOPY_END]  = "VHOST_USER_POSTCOPY_END",
  88         [VHOST_USER_GET_INFLIGHT_FD] = "VHOST_USER_GET_INFLIGHT_FD",
  89         [VHOST_USER_SET_INFLIGHT_FD] = "VHOST_USER_SET_INFLIGHT_FD",
  90         [VHOST_USER_SET_STATUS] = "VHOST_USER_SET_STATUS",
  91         [VHOST_USER_GET_STATUS] = "VHOST_USER_GET_STATUS",
  92 };
  93
  94 static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg);
  95 static int read_vhost_message(int sockfd, struct VhostUserMsg *msg);
  96
  97 static void
  98 close_msg_fds(struct VhostUserMsg *msg)
  99 {
 100         int i;
 101
 102         for (i = 0; i < msg->fd_num; i++)
 103                 close(msg->fds[i]);
 104 }
 105
 106 /*
 107  * Ensure the expected number of FDs is received,
 108  * close all FDs and return an error if this is not the case.
 109  */
 110 static int
 111 validate_msg_fds(struct VhostUserMsg *msg, int expected_fds)
 112 {
 113         if (msg->fd_num == expected_fds)
 114                 return 0;
 115
 116         VHOST_LOG_CONFIG(ERR,
 117                 " Expect %d FDs for request %s, received %d\n",
 118                 expected_fds,
 119                 vhost_message_str[msg->request.master],
 120                 msg->fd_num);
 121
 122         close_msg_fds(msg);
 123
 124         return -1;
 125 }
 126
 127 static uint64_t
 128 get_blk_size(int fd)
 129 {
 130         struct stat stat;
 131         int ret;
 132
 133         ret = fstat(fd, &stat);
 134         return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
 135 }
 136
 137 /*
 138  * Reclaim all the outstanding zmbufs for a virtqueue.
 139  */
 140 static void
 141 drain_zmbuf_list(struct vhost_virtqueue *vq)
 142 {
 143         struct zcopy_mbuf *zmbuf, *next;
 144
 145         for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
 146              zmbuf != NULL; zmbuf = next) {
 147                 next = TAILQ_NEXT(zmbuf, next);
 148
 149                 while (!mbuf_is_consumed(zmbuf->mbuf))
 150                         usleep(1000);
 151
 152                 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
 153                 restore_mbuf(zmbuf->mbuf);
 154                 rte_pktmbuf_free(zmbuf->mbuf);
 155                 put_zmbuf(zmbuf);
 156                 vq->nr_zmbuf -= 1;
 157         }
 158 }
 159
 160 static void
 161 free_mem_region(struct virtio_net *dev)
 162 {
 163         uint32_t i;
 164         struct rte_vhost_mem_region *reg;
 165         struct vhost_virtqueue *vq;
 166
 167         if (!dev || !dev->mem)
 168                 return;
 169
 170         if (dev->dequeue_zero_copy) {
 171                 for (i = 0; i < dev->nr_vring; i++) {
 172                         vq = dev->virtqueue[i];
 173                         if (vq)
 174                                 drain_zmbuf_list(vq);
 175                 }
 176         }
 177
 178         for (i = 0; i < dev->mem->nregions; i++) {
 179                 reg = &dev->mem->regions[i];
 180                 if (reg->host_user_addr) {
 181                         munmap(reg->mmap_addr, reg->mmap_size);
 182                         close(reg->fd);
 183                 }
 184         }
 185 }
 186
 187 void
 188 vhost_backend_cleanup(struct virtio_net *dev)
 189 {
 190         if (dev->mem) {
 191                 free_mem_region(dev);
 192                 rte_free(dev->mem);
 193                 dev->mem = NULL;
 194         }
 195
 196         rte_free(dev->guest_pages);
 197         dev->guest_pages = NULL;
 198
 199         if (dev->log_addr) {
 200                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 201                 dev->log_addr = 0;
 202         }
 203
 204         if (dev->inflight_info) {
 205                 if (dev->inflight_info->addr) {
 206                         munmap(dev->inflight_info->addr,
 207                                dev->inflight_info->size);
 208                         dev->inflight_info->addr = NULL;
 209                 }
 210
 211                 if (dev->inflight_info->fd >= 0) {
 212                         close(dev->inflight_info->fd);
 213                         dev->inflight_info->fd = -1;
 214                 }
 215
 216                 free(dev->inflight_info);
 217                 dev->inflight_info = NULL;
 218         }
 219
 220         if (dev->slave_req_fd >= 0) {
 221                 close(dev->slave_req_fd);
 222                 dev->slave_req_fd = -1;
 223         }
 224
 225         if (dev->postcopy_ufd >= 0) {
 226                 close(dev->postcopy_ufd);
 227                 dev->postcopy_ufd = -1;
 228         }
 229
 230         dev->postcopy_listening = 0;
 231 }
 232
 233 static void
 234 vhost_user_notify_queue_state(struct virtio_net *dev, uint16_t index,
 235                               int enable)
 236 {
 237         struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
 238
 239         if (vdpa_dev && vdpa_dev->ops->set_vring_state)
 240                 vdpa_dev->ops->set_vring_state(dev->vid, index, enable);
 241
 242         if (dev->notify_ops->vring_state_changed)
 243                 dev->notify_ops->vring_state_changed(dev->vid,
 244                                 index, enable);
 245 }
 246
 247 /*
 248  * This function just returns success at the moment unless
 249  * the device hasn't been initialised.
 250  */
 251 static int
 252 vhost_user_set_owner(struct virtio_net **pdev __rte_unused,
 253                         struct VhostUserMsg *msg,
 254                         int main_fd __rte_unused)
 255 {
 256         if (validate_msg_fds(msg, 0) != 0)
 257                 return RTE_VHOST_MSG_RESULT_ERR;
 258
 259         return RTE_VHOST_MSG_RESULT_OK;
 260 }
 261
 262 static int
 263 vhost_user_reset_owner(struct virtio_net **pdev,
 264                         struct VhostUserMsg *msg,
 265                         int main_fd __rte_unused)
 266 {
 267         struct virtio_net *dev = *pdev;
 268
 269         if (validate_msg_fds(msg, 0) != 0)
 270                 return RTE_VHOST_MSG_RESULT_ERR;
 271
 272         vhost_destroy_device_notify(dev);
 273
 274         cleanup_device(dev, 0);
 275         reset_device(dev);
 276         return RTE_VHOST_MSG_RESULT_OK;
 277 }
 278
 279 /*
 280  * The features that we support are requested.
 281  */
 282 static int
 283 vhost_user_get_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
 284                         int main_fd __rte_unused)
 285 {
 286         struct virtio_net *dev = *pdev;
 287         uint64_t features = 0;
 288
 289         if (validate_msg_fds(msg, 0) != 0)
 290                 return RTE_VHOST_MSG_RESULT_ERR;
 291
 292         rte_vhost_driver_get_features(dev->ifname, &features);
 293
 294         msg->payload.u64 = features;
 295         msg->size = sizeof(msg->payload.u64);
 296         msg->fd_num = 0;
 297
 298         return RTE_VHOST_MSG_RESULT_REPLY;
 299 }
 300
 301 /*
 302  * The queue number that we support are requested.
 303  */
 304 static int
 305 vhost_user_get_queue_num(struct virtio_net **pdev, struct VhostUserMsg *msg,
 306                         int main_fd __rte_unused)
 307 {
 308         struct virtio_net *dev = *pdev;
 309         uint32_t queue_num = 0;
 310
 311         if (validate_msg_fds(msg, 0) != 0)
 312                 return RTE_VHOST_MSG_RESULT_ERR;
 313
 314         rte_vhost_driver_get_queue_num(dev->ifname, &queue_num);
 315
 316         msg->payload.u64 = (uint64_t)queue_num;
 317         msg->size = sizeof(msg->payload.u64);
 318         msg->fd_num = 0;
 319
 320         return RTE_VHOST_MSG_RESULT_REPLY;
 321 }
 322
 323 /*
 324  * We receive the negotiated features supported by us and the virtio device.
 325  */
 326 static int
 327 vhost_user_set_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
 328                         int main_fd __rte_unused)
 329 {
 330         struct virtio_net *dev = *pdev;
 331         uint64_t features = msg->payload.u64;
 332         uint64_t vhost_features = 0;
 333         struct rte_vdpa_device *vdpa_dev;
 334
 335         if (validate_msg_fds(msg, 0) != 0)
 336                 return RTE_VHOST_MSG_RESULT_ERR;
 337
 338         rte_vhost_driver_get_features(dev->ifname, &vhost_features);
 339         if (features & ~vhost_features) {
 340                 VHOST_LOG_CONFIG(ERR,
 341                         "(%d) received invalid negotiated features.\n",
 342                         dev->vid);
 343                 dev->flags |= VIRTIO_DEV_FEATURES_FAILED;
 344                 dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK;
 345
 346                 return RTE_VHOST_MSG_RESULT_ERR;
 347         }
 348
 349         if (dev->flags & VIRTIO_DEV_RUNNING) {
 350                 if (dev->features == features)
 351                         return RTE_VHOST_MSG_RESULT_OK;
 352
 353                 /*
 354                  * Error out if master tries to change features while device is
 355                  * in running state. The exception being VHOST_F_LOG_ALL, which
 356                  * is enabled when the live-migration starts.
 357                  */
 358                 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) {
 359                         VHOST_LOG_CONFIG(ERR,
 360                                 "(%d) features changed while device is running.\n",
 361                                 dev->vid);
 362                         return RTE_VHOST_MSG_RESULT_ERR;
 363                 }
 364
 365                 if (dev->notify_ops->features_changed)
 366                         dev->notify_ops->features_changed(dev->vid, features);
 367         }
 368
 369         dev->features = features;
 370         if (dev->features &
 371                 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
 372                 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 373         } else {
 374                 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
 375         }
 376         VHOST_LOG_CONFIG(INFO,
 377                 "negotiated Virtio features: 0x%" PRIx64 "\n", dev->features);
 378         VHOST_LOG_CONFIG(DEBUG,
 379                 "(%d) mergeable RX buffers %s, virtio 1 %s\n",
 380                 dev->vid,
 381                 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
 382                 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 383
 384         if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
 385             !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
 386                 /*
 387                  * Remove all but first queue pair if MQ hasn't been
 388                  * negotiated. This is safe because the device is not
 389                  * running at this stage.
 390                  */
 391                 while (dev->nr_vring > 2) {
 392                         struct vhost_virtqueue *vq;
 393
 394                         vq = dev->virtqueue[--dev->nr_vring];
 395                         if (!vq)
 396                                 continue;
 397
 398                         dev->virtqueue[dev->nr_vring] = NULL;
 399                         cleanup_vq(vq, 1);
 400                         cleanup_vq_inflight(dev, vq);
 401                         free_vq(dev, vq);
 402                 }
 403         }
 404
 405         vdpa_dev = dev->vdpa_dev;
 406         if (vdpa_dev)
 407                 vdpa_dev->ops->set_features(dev->vid);
 408
 409         dev->flags &= ~VIRTIO_DEV_FEATURES_FAILED;
 410         return RTE_VHOST_MSG_RESULT_OK;
 411 }
 412
 413 /*
 414  * The virtio device sends us the size of the descriptor ring.
 415  */
 416 static int
 417 vhost_user_set_vring_num(struct virtio_net **pdev,
 418                         struct VhostUserMsg *msg,
 419                         int main_fd __rte_unused)
 420 {
 421         struct virtio_net *dev = *pdev;
 422         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 423
 424         if (validate_msg_fds(msg, 0) != 0)
 425                 return RTE_VHOST_MSG_RESULT_ERR;
 426
 427         vq->size = msg->payload.state.num;
 428
 429         /* VIRTIO 1.0, 2.4 Virtqueues says:
 430          *
 431          *   Queue Size value is always a power of 2. The maximum Queue Size
 432          *   value is 32768.
 433          *
 434          * VIRTIO 1.1 2.7 Virtqueues says:
 435          *
 436          *   Packed virtqueues support up to 2^15 entries each.
 437          */
 438         if (!vq_is_packed(dev)) {
 439                 if (vq->size & (vq->size - 1)) {
 440                         VHOST_LOG_CONFIG(ERR,
 441                                 "invalid virtqueue size %u\n", vq->size);
 442                         return RTE_VHOST_MSG_RESULT_ERR;
 443                 }
 444         }
 445
 446         if (vq->size > 32768) {
 447                 VHOST_LOG_CONFIG(ERR,
 448                         "invalid virtqueue size %u\n", vq->size);
 449                 return RTE_VHOST_MSG_RESULT_ERR;
 450         }
 451
 452         if (dev->dequeue_zero_copy) {
 453                 vq->nr_zmbuf = 0;
 454                 vq->last_zmbuf_idx = 0;
 455                 vq->zmbuf_size = vq->size;
 456                 if (vq->zmbufs)
 457                         rte_free(vq->zmbufs);
 458                 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
 459                                          sizeof(struct zcopy_mbuf), 0);
 460                 if (vq->zmbufs == NULL) {
 461                         VHOST_LOG_CONFIG(WARNING,
 462                                 "failed to allocate mem for zero copy; "
 463                                 "zero copy is force disabled\n");
 464                         dev->dequeue_zero_copy = 0;
 465                 }
 466                 TAILQ_INIT(&vq->zmbuf_list);
 467         }
 468
 469         if (vq_is_packed(dev)) {
 470                 if (vq->shadow_used_packed)
 471                         rte_free(vq->shadow_used_packed);
 472                 vq->shadow_used_packed = rte_malloc(NULL,
 473                                 vq->size *
 474                                 sizeof(struct vring_used_elem_packed),
 475                                 RTE_CACHE_LINE_SIZE);
 476                 if (!vq->shadow_used_packed) {
 477                         VHOST_LOG_CONFIG(ERR,
 478                                         "failed to allocate memory for shadow used ring.\n");
 479                         return RTE_VHOST_MSG_RESULT_ERR;
 480                 }
 481
 482         } else {
 483                 if (vq->shadow_used_split)
 484                         rte_free(vq->shadow_used_split);
 485
 486                 vq->shadow_used_split = rte_malloc(NULL,
 487                                 vq->size * sizeof(struct vring_used_elem),
 488                                 RTE_CACHE_LINE_SIZE);
 489
 490                 if (!vq->shadow_used_split) {
 491                         VHOST_LOG_CONFIG(ERR,
 492                                         "failed to allocate memory for vq internal data.\n");
 493                         return RTE_VHOST_MSG_RESULT_ERR;
 494                 }
 495         }
 496
 497         if (vq->batch_copy_elems)
 498                 rte_free(vq->batch_copy_elems);
 499         vq->batch_copy_elems = rte_malloc(NULL,
 500                                 vq->size * sizeof(struct batch_copy_elem),
 501                                 RTE_CACHE_LINE_SIZE);
 502         if (!vq->batch_copy_elems) {
 503                 VHOST_LOG_CONFIG(ERR,
 504                         "failed to allocate memory for batching copy.\n");
 505                 return RTE_VHOST_MSG_RESULT_ERR;
 506         }
 507
 508         return RTE_VHOST_MSG_RESULT_OK;
 509 }
 510
 511 /*
 512  * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
 513  * same numa node as the memory of vring descriptor.
 514  */
 515 #ifdef RTE_LIBRTE_VHOST_NUMA
 516 static struct virtio_net*
 517 numa_realloc(struct virtio_net *dev, int index)
 518 {
 519         int oldnode, newnode;
 520         struct virtio_net *old_dev;
 521         struct vhost_virtqueue *old_vq, *vq;
 522         struct zcopy_mbuf *new_zmbuf;
 523         struct vring_used_elem *new_shadow_used_split;
 524         struct vring_used_elem_packed *new_shadow_used_packed;
 525         struct batch_copy_elem *new_batch_copy_elems;
 526         int ret;
 527
 528         if (dev->flags & VIRTIO_DEV_RUNNING)
 529                 return dev;
 530
 531         old_dev = dev;
 532         vq = old_vq = dev->virtqueue[index];
 533
 534         ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
 535                             MPOL_F_NODE | MPOL_F_ADDR);
 536
 537         /* check if we need to reallocate vq */
 538         ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
 539                              MPOL_F_NODE | MPOL_F_ADDR);
 540         if (ret) {
 541                 VHOST_LOG_CONFIG(ERR,
 542                         "Unable to get vq numa information.\n");
 543                 return dev;
 544         }
 545         if (oldnode != newnode) {
 546                 VHOST_LOG_CONFIG(INFO,
 547                         "reallocate vq from %d to %d node\n", oldnode, newnode);
 548                 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
 549                 if (!vq)
 550                         return dev;
 551
 552                 memcpy(vq, old_vq, sizeof(*vq));
 553                 TAILQ_INIT(&vq->zmbuf_list);
 554
 555                 if (dev->dequeue_zero_copy) {
 556                         new_zmbuf = rte_malloc_socket(NULL, vq->zmbuf_size *
 557                                         sizeof(struct zcopy_mbuf), 0, newnode);
 558                         if (new_zmbuf) {
 559                                 rte_free(vq->zmbufs);
 560                                 vq->zmbufs = new_zmbuf;
 561                         }
 562                 }
 563
 564                 if (vq_is_packed(dev)) {
 565                         new_shadow_used_packed = rte_malloc_socket(NULL,
 566                                         vq->size *
 567                                         sizeof(struct vring_used_elem_packed),
 568                                         RTE_CACHE_LINE_SIZE,
 569                                         newnode);
 570                         if (new_shadow_used_packed) {
 571                                 rte_free(vq->shadow_used_packed);
 572                                 vq->shadow_used_packed = new_shadow_used_packed;
 573                         }
 574                 } else {
 575                         new_shadow_used_split = rte_malloc_socket(NULL,
 576                                         vq->size *
 577                                         sizeof(struct vring_used_elem),
 578                                         RTE_CACHE_LINE_SIZE,
 579                                         newnode);
 580                         if (new_shadow_used_split) {
 581                                 rte_free(vq->shadow_used_split);
 582                                 vq->shadow_used_split = new_shadow_used_split;
 583                         }
 584                 }
 585
 586                 new_batch_copy_elems = rte_malloc_socket(NULL,
 587                         vq->size * sizeof(struct batch_copy_elem),
 588                         RTE_CACHE_LINE_SIZE,
 589                         newnode);
 590                 if (new_batch_copy_elems) {
 591                         rte_free(vq->batch_copy_elems);
 592                         vq->batch_copy_elems = new_batch_copy_elems;
 593                 }
 594
 595                 rte_free(old_vq);
 596         }
 597
 598         /* check if we need to reallocate dev */
 599         ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
 600                             MPOL_F_NODE | MPOL_F_ADDR);
 601         if (ret) {
 602                 VHOST_LOG_CONFIG(ERR,
 603                         "Unable to get dev numa information.\n");
 604                 goto out;
 605         }
 606         if (oldnode != newnode) {
 607                 VHOST_LOG_CONFIG(INFO,
 608                         "reallocate dev from %d to %d node\n",
 609                         oldnode, newnode);
 610                 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
 611                 if (!dev) {
 612                         dev = old_dev;
 613                         goto out;
 614                 }
 615
 616                 memcpy(dev, old_dev, sizeof(*dev));
 617                 rte_free(old_dev);
 618         }
 619
 620 out:
 621         dev->virtqueue[index] = vq;
 622         vhost_devices[dev->vid] = dev;
 623
 624         if (old_vq != vq)
 625                 vhost_user_iotlb_init(dev, index);
 626
 627         return dev;
 628 }
 629 #else
 630 static struct virtio_net*
 631 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 632 {
 633         return dev;
 634 }
 635 #endif
 636
 637 /* Converts QEMU virtual address to Vhost virtual address. */
 638 static uint64_t
 639 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
 640 {
 641         struct rte_vhost_mem_region *r;
 642         uint32_t i;
 643
 644         if (unlikely(!dev || !dev->mem))
 645                 goto out_error;
 646
 647         /* Find the region where the address lives. */
 648         for (i = 0; i < dev->mem->nregions; i++) {
 649                 r = &dev->mem->regions[i];
 650
 651                 if (qva >= r->guest_user_addr &&
 652                     qva <  r->guest_user_addr + r->size) {
 653
 654                         if (unlikely(*len > r->guest_user_addr + r->size - qva))
 655                                 *len = r->guest_user_addr + r->size - qva;
 656
 657                         return qva - r->guest_user_addr +
 658                                r->host_user_addr;
 659                 }
 660         }
 661 out_error:
 662         *len = 0;
 663
 664         return 0;
 665 }
 666
 667
 668 /*
 669  * Converts ring address to Vhost virtual address.
 670  * If IOMMU is enabled, the ring address is a guest IO virtual address,
 671  * else it is a QEMU virtual address.
 672  */
 673 static uint64_t
 674 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 675                 uint64_t ra, uint64_t *size)
 676 {
 677         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 678                 uint64_t vva;
 679
 680                 vhost_user_iotlb_rd_lock(vq);
 681                 vva = vhost_iova_to_vva(dev, vq, ra,
 682                                         size, VHOST_ACCESS_RW);
 683                 vhost_user_iotlb_rd_unlock(vq);
 684
 685                 return vva;
 686         }
 687
 688         return qva_to_vva(dev, ra, size);
 689 }
 690
 691 static uint64_t
 692 log_addr_to_gpa(struct virtio_net *dev, struct vhost_virtqueue *vq)
 693 {
 694         uint64_t log_gpa;
 695
 696         vhost_user_iotlb_rd_lock(vq);
 697         log_gpa = translate_log_addr(dev, vq, vq->ring_addrs.log_guest_addr);
 698         vhost_user_iotlb_rd_unlock(vq);
 699
 700         return log_gpa;
 701 }
 702
 703 static struct virtio_net *
 704 translate_ring_addresses(struct virtio_net *dev, int vq_index)
 705 {
 706         struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 707         struct vhost_vring_addr *addr = &vq->ring_addrs;
 708         uint64_t len, expected_len;
 709
 710         if (addr->flags & (1 << VHOST_VRING_F_LOG)) {
 711                 vq->log_guest_addr =
 712                         log_addr_to_gpa(dev, vq);
 713                 if (vq->log_guest_addr == 0) {
 714                         VHOST_LOG_CONFIG(DEBUG,
 715                                 "(%d) failed to map log_guest_addr.\n",
 716                                 dev->vid);
 717                         return dev;
 718                 }
 719         }
 720
 721         if (vq_is_packed(dev)) {
 722                 len = sizeof(struct vring_packed_desc) * vq->size;
 723                 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 724                         ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len);
 725                 if (vq->desc_packed == NULL ||
 726                                 len != sizeof(struct vring_packed_desc) *
 727                                 vq->size) {
 728                         VHOST_LOG_CONFIG(DEBUG,
 729                                 "(%d) failed to map desc_packed ring.\n",
 730                                 dev->vid);
 731                         return dev;
 732                 }
 733
 734                 dev = numa_realloc(dev, vq_index);
 735                 vq = dev->virtqueue[vq_index];
 736                 addr = &vq->ring_addrs;
 737
 738                 len = sizeof(struct vring_packed_desc_event);
 739                 vq->driver_event = (struct vring_packed_desc_event *)
 740                                         (uintptr_t)ring_addr_to_vva(dev,
 741                                         vq, addr->avail_user_addr, &len);
 742                 if (vq->driver_event == NULL ||
 743                                 len != sizeof(struct vring_packed_desc_event)) {
 744                         VHOST_LOG_CONFIG(DEBUG,
 745                                 "(%d) failed to find driver area address.\n",
 746                                 dev->vid);
 747                         return dev;
 748                 }
 749
 750                 len = sizeof(struct vring_packed_desc_event);
 751                 vq->device_event = (struct vring_packed_desc_event *)
 752                                         (uintptr_t)ring_addr_to_vva(dev,
 753                                         vq, addr->used_user_addr, &len);
 754                 if (vq->device_event == NULL ||
 755                                 len != sizeof(struct vring_packed_desc_event)) {
 756                         VHOST_LOG_CONFIG(DEBUG,
 757                                 "(%d) failed to find device area address.\n",
 758                                 dev->vid);
 759                         return dev;
 760                 }
 761
 762                 vq->access_ok = 1;
 763                 return dev;
 764         }
 765
 766         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 767         if (vq->desc && vq->avail && vq->used)
 768                 return dev;
 769
 770         len = sizeof(struct vring_desc) * vq->size;
 771         vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
 772                         vq, addr->desc_user_addr, &len);
 773         if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
 774                 VHOST_LOG_CONFIG(DEBUG,
 775                         "(%d) failed to map desc ring.\n",
 776                         dev->vid);
 777                 return dev;
 778         }
 779
 780         dev = numa_realloc(dev, vq_index);
 781         vq = dev->virtqueue[vq_index];
 782         addr = &vq->ring_addrs;
 783
 784         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
 785         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 786                 len += sizeof(uint16_t);
 787         expected_len = len;
 788         vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
 789                         vq, addr->avail_user_addr, &len);
 790         if (vq->avail == 0 || len != expected_len) {
 791                 VHOST_LOG_CONFIG(DEBUG,
 792                         "(%d) failed to map avail ring.\n",
 793                         dev->vid);
 794                 return dev;
 795         }
 796
 797         len = sizeof(struct vring_used) +
 798                 sizeof(struct vring_used_elem) * vq->size;
 799         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 800                 len += sizeof(uint16_t);
 801         expected_len = len;
 802         vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
 803                         vq, addr->used_user_addr, &len);
 804         if (vq->used == 0 || len != expected_len) {
 805                 VHOST_LOG_CONFIG(DEBUG,
 806                         "(%d) failed to map used ring.\n",
 807                         dev->vid);
 808                 return dev;
 809         }
 810
 811         if (vq->last_used_idx != vq->used->idx) {
 812                 VHOST_LOG_CONFIG(WARNING,
 813                         "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
 814                         "some packets maybe resent for Tx and dropped for Rx\n",
 815                         vq->last_used_idx, vq->used->idx);
 816                 vq->last_used_idx  = vq->used->idx;
 817                 vq->last_avail_idx = vq->used->idx;
 818         }
 819
 820         vq->access_ok = 1;
 821
 822         VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address desc: %p\n",
 823                         dev->vid, vq->desc);
 824         VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address avail: %p\n",
 825                         dev->vid, vq->avail);
 826         VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address used: %p\n",
 827                         dev->vid, vq->used);
 828         VHOST_LOG_CONFIG(DEBUG, "(%d) log_guest_addr: %" PRIx64 "\n",
 829                         dev->vid, vq->log_guest_addr);
 830
 831         return dev;
 832 }
 833
 834 /*
 835  * The virtio device sends us the desc, used and avail ring addresses.
 836  * This function then converts these to our address space.
 837  */
 838 static int
 839 vhost_user_set_vring_addr(struct virtio_net **pdev, struct VhostUserMsg *msg,
 840                         int main_fd __rte_unused)
 841 {
 842         struct virtio_net *dev = *pdev;
 843         struct vhost_virtqueue *vq;
 844         struct vhost_vring_addr *addr = &msg->payload.addr;
 845         bool access_ok;
 846
 847         if (validate_msg_fds(msg, 0) != 0)
 848                 return RTE_VHOST_MSG_RESULT_ERR;
 849
 850         if (dev->mem == NULL)
 851                 return RTE_VHOST_MSG_RESULT_ERR;
 852
 853         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 854         vq = dev->virtqueue[msg->payload.addr.index];
 855
 856         access_ok = vq->access_ok;
 857
 858         /*
 859          * Rings addresses should not be interpreted as long as the ring is not
 860          * started and enabled
 861          */
 862         memcpy(&vq->ring_addrs, addr, sizeof(*addr));
 863
 864         vring_invalidate(dev, vq);
 865
 866         if ((vq->enabled && (dev->features &
 867                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) ||
 868                         access_ok) {
 869                 dev = translate_ring_addresses(dev, msg->payload.addr.index);
 870                 if (!dev)
 871                         return RTE_VHOST_MSG_RESULT_ERR;
 872
 873                 *pdev = dev;
 874         }
 875
 876         return RTE_VHOST_MSG_RESULT_OK;
 877 }
 878
 879 /*
 880  * The virtio device sends us the available ring last used index.
 881  */
 882 static int
 883 vhost_user_set_vring_base(struct virtio_net **pdev,
 884                         struct VhostUserMsg *msg,
 885                         int main_fd __rte_unused)
 886 {
 887         struct virtio_net *dev = *pdev;
 888         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 889         uint64_t val = msg->payload.state.num;
 890
 891         if (validate_msg_fds(msg, 0) != 0)
 892                 return RTE_VHOST_MSG_RESULT_ERR;
 893
 894         if (vq_is_packed(dev)) {
 895                 /*
 896                  * Bit[0:14]: avail index
 897                  * Bit[15]: avail wrap counter
 898                  */
 899                 vq->last_avail_idx = val & 0x7fff;
 900                 vq->avail_wrap_counter = !!(val & (0x1 << 15));
 901                 /*
 902                  * Set used index to same value as available one, as
 903                  * their values should be the same since ring processing
 904                  * was stopped at get time.
 905                  */
 906                 vq->last_used_idx = vq->last_avail_idx;
 907                 vq->used_wrap_counter = vq->avail_wrap_counter;
 908         } else {
 909                 vq->last_used_idx = msg->payload.state.num;
 910                 vq->last_avail_idx = msg->payload.state.num;
 911         }
 912
 913         return RTE_VHOST_MSG_RESULT_OK;
 914 }
 915
 916 static int
 917 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 918                    uint64_t host_phys_addr, uint64_t size)
 919 {
 920         struct guest_page *page, *last_page;
 921         struct guest_page *old_pages;
 922
 923         if (dev->nr_guest_pages == dev->max_guest_pages) {
 924                 dev->max_guest_pages *= 2;
 925                 old_pages = dev->guest_pages;
 926                 dev->guest_pages = rte_realloc(dev->guest_pages,
 927                                         dev->max_guest_pages * sizeof(*page),
 928                                         RTE_CACHE_LINE_SIZE);
 929                 if (dev->guest_pages == NULL) {
 930                         VHOST_LOG_CONFIG(ERR, "cannot realloc guest_pages\n");
 931                         rte_free(old_pages);
 932                         return -1;
 933                 }
 934         }
 935
 936         if (dev->nr_guest_pages > 0) {
 937                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
 938                 /* merge if the two pages are continuous */
 939                 if (host_phys_addr == last_page->host_phys_addr +
 940                                       last_page->size) {
 941                         last_page->size += size;
 942                         return 0;
 943                 }
 944         }
 945
 946         page = &dev->guest_pages[dev->nr_guest_pages++];
 947         page->guest_phys_addr = guest_phys_addr;
 948         page->host_phys_addr  = host_phys_addr;
 949         page->size = size;
 950
 951         return 0;
 952 }
 953
 954 static int
 955 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
 956                 uint64_t page_size)
 957 {
 958         uint64_t reg_size = reg->size;
 959         uint64_t host_user_addr  = reg->host_user_addr;
 960         uint64_t guest_phys_addr = reg->guest_phys_addr;
 961         uint64_t host_phys_addr;
 962         uint64_t size;
 963
 964         host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
 965         size = page_size - (guest_phys_addr & (page_size - 1));
 966         size = RTE_MIN(size, reg_size);
 967
 968         if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size) < 0)
 969                 return -1;
 970
 971         host_user_addr  += size;
 972         guest_phys_addr += size;
 973         reg_size -= size;
 974
 975         while (reg_size > 0) {
 976                 size = RTE_MIN(reg_size, page_size);
 977                 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
 978                                                   host_user_addr);
 979                 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
 980                                 size) < 0)
 981                         return -1;
 982
 983                 host_user_addr  += size;
 984                 guest_phys_addr += size;
 985                 reg_size -= size;
 986         }
 987
 988         /* sort guest page array if over binary search threshold */
 989         if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
 990                 qsort((void *)dev->guest_pages, dev->nr_guest_pages,
 991                         sizeof(struct guest_page), guest_page_addrcmp);
 992         }
 993
 994         return 0;
 995 }
 996
 997 #ifdef RTE_LIBRTE_VHOST_DEBUG
 998 /* TODO: enable it only in debug mode? */
 999 static void
1000 dump_guest_pages(struct virtio_net *dev)
1001 {
1002         uint32_t i;
1003         struct guest_page *page;
1004
1005         for (i = 0; i < dev->nr_guest_pages; i++) {
1006                 page = &dev->guest_pages[i];
1007
1008                 VHOST_LOG_CONFIG(INFO,
1009                         "guest physical page region %u\n"
1010                         "\t guest_phys_addr: %" PRIx64 "\n"
1011                         "\t host_phys_addr : %" PRIx64 "\n"
1012                         "\t size           : %" PRIx64 "\n",
1013                         i,
1014                         page->guest_phys_addr,
1015                         page->host_phys_addr,
1016                         page->size);
1017         }
1018 }
1019 #else
1020 #define dump_guest_pages(dev)
1021 #endif
1022
1023 static bool
1024 vhost_memory_changed(struct VhostUserMemory *new,
1025                      struct rte_vhost_memory *old)
1026 {
1027         uint32_t i;
1028
1029         if (new->nregions != old->nregions)
1030                 return true;
1031
1032         for (i = 0; i < new->nregions; ++i) {
1033                 VhostUserMemoryRegion *new_r = &new->regions[i];
1034                 struct rte_vhost_mem_region *old_r = &old->regions[i];
1035
1036                 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
1037                         return true;
1038                 if (new_r->memory_size != old_r->size)
1039                         return true;
1040                 if (new_r->userspace_addr != old_r->guest_user_addr)
1041                         return true;
1042         }
1043
1044         return false;
1045 }
1046
1047 static int
1048 vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
1049                         int main_fd)
1050 {
1051         struct virtio_net *dev = *pdev;
1052         struct VhostUserMemory *memory = &msg->payload.memory;
1053         struct rte_vhost_mem_region *reg;
1054         void *mmap_addr;
1055         uint64_t mmap_size;
1056         uint64_t mmap_offset;
1057         uint64_t alignment;
1058         uint32_t i;
1059         int populate;
1060         int fd;
1061
1062         if (validate_msg_fds(msg, memory->nregions) != 0)
1063                 return RTE_VHOST_MSG_RESULT_ERR;
1064
1065         if (memory->nregions > VHOST_MEMORY_MAX_NREGIONS) {
1066                 VHOST_LOG_CONFIG(ERR,
1067                         "too many memory regions (%u)\n", memory->nregions);
1068                 return RTE_VHOST_MSG_RESULT_ERR;
1069         }
1070
1071         if (dev->mem && !vhost_memory_changed(memory, dev->mem)) {
1072                 VHOST_LOG_CONFIG(INFO,
1073                         "(%d) memory regions not changed\n", dev->vid);
1074
1075                 close_msg_fds(msg);
1076
1077                 return RTE_VHOST_MSG_RESULT_OK;
1078         }
1079
1080         if (dev->mem) {
1081                 if (dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) {
1082                         struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
1083
1084                         if (vdpa_dev && vdpa_dev->ops->dev_close)
1085                                 vdpa_dev->ops->dev_close(dev->vid);
1086                         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1087                 }
1088                 free_mem_region(dev);
1089                 rte_free(dev->mem);
1090                 dev->mem = NULL;
1091         }
1092
1093         /* Flush IOTLB cache as previous HVAs are now invalid */
1094         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1095                 for (i = 0; i < dev->nr_vring; i++)
1096                         vhost_user_iotlb_flush_all(dev->virtqueue[i]);
1097
1098         dev->nr_guest_pages = 0;
1099         if (dev->guest_pages == NULL) {
1100                 dev->max_guest_pages = 8;
1101                 dev->guest_pages = rte_zmalloc(NULL,
1102                                         dev->max_guest_pages *
1103                                         sizeof(struct guest_page),
1104                                         RTE_CACHE_LINE_SIZE);
1105                 if (dev->guest_pages == NULL) {
1106                         VHOST_LOG_CONFIG(ERR,
1107                                 "(%d) failed to allocate memory "
1108                                 "for dev->guest_pages\n",
1109                                 dev->vid);
1110                         return RTE_VHOST_MSG_RESULT_ERR;
1111                 }
1112         }
1113
1114         dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
1115                 sizeof(struct rte_vhost_mem_region) * memory->nregions, 0);
1116         if (dev->mem == NULL) {
1117                 VHOST_LOG_CONFIG(ERR,
1118                         "(%d) failed to allocate memory for dev->mem\n",
1119                         dev->vid);
1120                 return RTE_VHOST_MSG_RESULT_ERR;
1121         }
1122         dev->mem->nregions = memory->nregions;
1123
1124         for (i = 0; i < memory->nregions; i++) {
1125                 fd  = msg->fds[i];
1126                 reg = &dev->mem->regions[i];
1127
1128                 reg->guest_phys_addr = memory->regions[i].guest_phys_addr;
1129                 reg->guest_user_addr = memory->regions[i].userspace_addr;
1130                 reg->size            = memory->regions[i].memory_size;
1131                 reg->fd              = fd;
1132
1133                 mmap_offset = memory->regions[i].mmap_offset;
1134
1135                 /* Check for memory_size + mmap_offset overflow */
1136                 if (mmap_offset >= -reg->size) {
1137                         VHOST_LOG_CONFIG(ERR,
1138                                 "mmap_offset (%#"PRIx64") and memory_size "
1139                                 "(%#"PRIx64") overflow\n",
1140                                 mmap_offset, reg->size);
1141                         goto err_mmap;
1142                 }
1143
1144                 mmap_size = reg->size + mmap_offset;
1145
1146                 /* mmap() without flag of MAP_ANONYMOUS, should be called
1147                  * with length argument aligned with hugepagesz at older
1148                  * longterm version Linux, like 2.6.32 and 3.2.72, or
1149                  * mmap() will fail with EINVAL.
1150                  *
1151                  * to avoid failure, make sure in caller to keep length
1152                  * aligned.
1153                  */
1154                 alignment = get_blk_size(fd);
1155                 if (alignment == (uint64_t)-1) {
1156                         VHOST_LOG_CONFIG(ERR,
1157                                 "couldn't get hugepage size through fstat\n");
1158                         goto err_mmap;
1159                 }
1160                 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
1161                 if (mmap_size == 0) {
1162                         /*
1163                          * It could happen if initial mmap_size + alignment
1164                          * overflows the sizeof uint64, which could happen if
1165                          * either mmap_size or alignment value is wrong.
1166                          *
1167                          * mmap() kernel implementation would return an error,
1168                          * but better catch it before and provide useful info
1169                          * in the logs.
1170                          */
1171                         VHOST_LOG_CONFIG(ERR, "mmap size (0x%" PRIx64 ") "
1172                                         "or alignment (0x%" PRIx64 ") is invalid\n",
1173                                         reg->size + mmap_offset, alignment);
1174                         goto err_mmap;
1175                 }
1176
1177                 populate = (dev->dequeue_zero_copy || dev->async_copy) ?
1178                         MAP_POPULATE : 0;
1179                 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
1180                                  MAP_SHARED | populate, fd, 0);
1181
1182                 if (mmap_addr == MAP_FAILED) {
1183                         VHOST_LOG_CONFIG(ERR,
1184                                 "mmap region %u failed.\n", i);
1185                         goto err_mmap;
1186                 }
1187
1188                 reg->mmap_addr = mmap_addr;
1189                 reg->mmap_size = mmap_size;
1190                 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
1191                                       mmap_offset;
1192
1193                 if (dev->dequeue_zero_copy || dev->async_copy)
1194                         if (add_guest_pages(dev, reg, alignment) < 0) {
1195                                 VHOST_LOG_CONFIG(ERR,
1196                                         "adding guest pages to region %u failed.\n",
1197                                         i);
1198                                 goto err_mmap;
1199                         }
1200
1201                 VHOST_LOG_CONFIG(INFO,
1202                         "guest memory region %u, size: 0x%" PRIx64 "\n"
1203                         "\t guest physical addr: 0x%" PRIx64 "\n"
1204                         "\t guest virtual  addr: 0x%" PRIx64 "\n"
1205                         "\t host  virtual  addr: 0x%" PRIx64 "\n"
1206                         "\t mmap addr : 0x%" PRIx64 "\n"
1207                         "\t mmap size : 0x%" PRIx64 "\n"
1208                         "\t mmap align: 0x%" PRIx64 "\n"
1209                         "\t mmap off  : 0x%" PRIx64 "\n",
1210                         i, reg->size,
1211                         reg->guest_phys_addr,
1212                         reg->guest_user_addr,
1213                         reg->host_user_addr,
1214                         (uint64_t)(uintptr_t)mmap_addr,
1215                         mmap_size,
1216                         alignment,
1217                         mmap_offset);
1218
1219                 if (dev->postcopy_listening) {
1220                         /*
1221                          * We haven't a better way right now than sharing
1222                          * DPDK's virtual address with Qemu, so that Qemu can
1223                          * retrieve the region offset when handling userfaults.
1224                          */
1225                         memory->regions[i].userspace_addr =
1226                                 reg->host_user_addr;
1227                 }
1228         }
1229         if (dev->postcopy_listening) {
1230                 /* Send the addresses back to qemu */
1231                 msg->fd_num = 0;
1232                 send_vhost_reply(main_fd, msg);
1233
1234                 /* Wait for qemu to acknolwedge it's got the addresses
1235                  * we've got to wait before we're allowed to generate faults.
1236                  */
1237                 VhostUserMsg ack_msg;
1238                 if (read_vhost_message(main_fd, &ack_msg) <= 0) {
1239                         VHOST_LOG_CONFIG(ERR,
1240                                 "Failed to read qemu ack on postcopy set-mem-table\n");
1241                         goto err_mmap;
1242                 }
1243
1244                 if (validate_msg_fds(&ack_msg, 0) != 0)
1245                         goto err_mmap;
1246
1247                 if (ack_msg.request.master != VHOST_USER_SET_MEM_TABLE) {
1248                         VHOST_LOG_CONFIG(ERR,
1249                                 "Bad qemu ack on postcopy set-mem-table (%d)\n",
1250                                 ack_msg.request.master);
1251                         goto err_mmap;
1252                 }
1253
1254                 /* Now userfault register and we can use the memory */
1255                 for (i = 0; i < memory->nregions; i++) {
1256 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
1257                         reg = &dev->mem->regions[i];
1258                         struct uffdio_register reg_struct;
1259
1260                         /*
1261                          * Let's register all the mmap'ed area to ensure
1262                          * alignment on page boundary.
1263                          */
1264                         reg_struct.range.start =
1265                                 (uint64_t)(uintptr_t)reg->mmap_addr;
1266                         reg_struct.range.len = reg->mmap_size;
1267                         reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING;
1268
1269                         if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER,
1270                                                 &reg_struct)) {
1271                                 VHOST_LOG_CONFIG(ERR,
1272                                         "Failed to register ufd for region %d: (ufd = %d) %s\n",
1273                                         i, dev->postcopy_ufd,
1274                                         strerror(errno));
1275                                 goto err_mmap;
1276                         }
1277                         VHOST_LOG_CONFIG(INFO,
1278                                 "\t userfaultfd registered for range : "
1279                                 "%" PRIx64 " - %" PRIx64 "\n",
1280                                 (uint64_t)reg_struct.range.start,
1281                                 (uint64_t)reg_struct.range.start +
1282                                 (uint64_t)reg_struct.range.len - 1);
1283 #else
1284                         goto err_mmap;
1285 #endif
1286                 }
1287         }
1288
1289         for (i = 0; i < dev->nr_vring; i++) {
1290                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1291
1292                 if (vq->desc || vq->avail || vq->used) {
1293                         /*
1294                          * If the memory table got updated, the ring addresses
1295                          * need to be translated again as virtual addresses have
1296                          * changed.
1297                          */
1298                         vring_invalidate(dev, vq);
1299
1300                         dev = translate_ring_addresses(dev, i);
1301                         if (!dev) {
1302                                 dev = *pdev;
1303                                 goto err_mmap;
1304                         }
1305
1306                         *pdev = dev;
1307                 }
1308         }
1309
1310         dump_guest_pages(dev);
1311
1312         return RTE_VHOST_MSG_RESULT_OK;
1313
1314 err_mmap:
1315         free_mem_region(dev);
1316         rte_free(dev->mem);
1317         dev->mem = NULL;
1318         return RTE_VHOST_MSG_RESULT_ERR;
1319 }
1320
1321 static bool
1322 vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq)
1323 {
1324         bool rings_ok;
1325
1326         if (!vq)
1327                 return false;
1328
1329         if (vq_is_packed(dev))
1330                 rings_ok = vq->desc_packed && vq->driver_event &&
1331                         vq->device_event;
1332         else
1333                 rings_ok = vq->desc && vq->avail && vq->used;
1334
1335         return rings_ok &&
1336                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1337                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1338                vq->enabled;
1339 }
1340
1341 #define VIRTIO_DEV_NUM_VQS_TO_BE_READY 2u
1342
1343 static int
1344 virtio_is_ready(struct virtio_net *dev)
1345 {
1346         struct vhost_virtqueue *vq;
1347         uint32_t i;
1348
1349         if (dev->flags & VIRTIO_DEV_READY)
1350                 return 1;
1351
1352         if (dev->nr_vring < VIRTIO_DEV_NUM_VQS_TO_BE_READY)
1353                 return 0;
1354
1355         for (i = 0; i < VIRTIO_DEV_NUM_VQS_TO_BE_READY; i++) {
1356                 vq = dev->virtqueue[i];
1357
1358                 if (!vq_is_ready(dev, vq))
1359                         return 0;
1360         }
1361
1362         /* If supported, ensure the frontend is really done with config */
1363         if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS))
1364                 if (!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK))
1365                         return 0;
1366
1367         dev->flags |= VIRTIO_DEV_READY;
1368
1369         if (!(dev->flags & VIRTIO_DEV_RUNNING))
1370                 VHOST_LOG_CONFIG(INFO,
1371                         "virtio is now ready for processing.\n");
1372         return 1;
1373 }
1374
1375 static void *
1376 inflight_mem_alloc(const char *name, size_t size, int *fd)
1377 {
1378         void *ptr;
1379         int mfd = -1;
1380         char fname[20] = "/tmp/memfd-XXXXXX";
1381
1382         *fd = -1;
1383 #ifdef MEMFD_SUPPORTED
1384         mfd = memfd_create(name, MFD_CLOEXEC);
1385 #else
1386         RTE_SET_USED(name);
1387 #endif
1388         if (mfd == -1) {
1389                 mfd = mkstemp(fname);
1390                 if (mfd == -1) {
1391                         VHOST_LOG_CONFIG(ERR,
1392                                 "failed to get inflight buffer fd\n");
1393                         return NULL;
1394                 }
1395
1396                 unlink(fname);
1397         }
1398
1399         if (ftruncate(mfd, size) == -1) {
1400                 VHOST_LOG_CONFIG(ERR,
1401                         "failed to alloc inflight buffer\n");
1402                 close(mfd);
1403                 return NULL;
1404         }
1405
1406         ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
1407         if (ptr == MAP_FAILED) {
1408                 VHOST_LOG_CONFIG(ERR,
1409                         "failed to mmap inflight buffer\n");
1410                 close(mfd);
1411                 return NULL;
1412         }
1413
1414         *fd = mfd;
1415         return ptr;
1416 }
1417
1418 static uint32_t
1419 get_pervq_shm_size_split(uint16_t queue_size)
1420 {
1421         return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_split) *
1422                                   queue_size + sizeof(uint64_t) +
1423                                   sizeof(uint16_t) * 4, INFLIGHT_ALIGNMENT);
1424 }
1425
1426 static uint32_t
1427 get_pervq_shm_size_packed(uint16_t queue_size)
1428 {
1429         return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_packed)
1430                                   * queue_size + sizeof(uint64_t) +
1431                                   sizeof(uint16_t) * 6 + sizeof(uint8_t) * 9,
1432                                   INFLIGHT_ALIGNMENT);
1433 }
1434
1435 static int
1436 vhost_user_get_inflight_fd(struct virtio_net **pdev,
1437                            VhostUserMsg *msg,
1438                            int main_fd __rte_unused)
1439 {
1440         struct rte_vhost_inflight_info_packed *inflight_packed;
1441         uint64_t pervq_inflight_size, mmap_size;
1442         uint16_t num_queues, queue_size;
1443         struct virtio_net *dev = *pdev;
1444         int fd, i, j;
1445         void *addr;
1446
1447         if (msg->size != sizeof(msg->payload.inflight)) {
1448                 VHOST_LOG_CONFIG(ERR,
1449                         "invalid get_inflight_fd message size is %d\n",
1450                         msg->size);
1451                 return RTE_VHOST_MSG_RESULT_ERR;
1452         }
1453
1454         if (dev->inflight_info == NULL) {
1455                 dev->inflight_info = calloc(1,
1456                                             sizeof(struct inflight_mem_info));
1457                 if (!dev->inflight_info) {
1458                         VHOST_LOG_CONFIG(ERR,
1459                                 "failed to alloc dev inflight area\n");
1460                         return RTE_VHOST_MSG_RESULT_ERR;
1461                 }
1462                 dev->inflight_info->fd = -1;
1463         }
1464
1465         num_queues = msg->payload.inflight.num_queues;
1466         queue_size = msg->payload.inflight.queue_size;
1467
1468         VHOST_LOG_CONFIG(INFO, "get_inflight_fd num_queues: %u\n",
1469                 msg->payload.inflight.num_queues);
1470         VHOST_LOG_CONFIG(INFO, "get_inflight_fd queue_size: %u\n",
1471                 msg->payload.inflight.queue_size);
1472
1473         if (vq_is_packed(dev))
1474                 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1475         else
1476                 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1477
1478         mmap_size = num_queues * pervq_inflight_size;
1479         addr = inflight_mem_alloc("vhost-inflight", mmap_size, &fd);
1480         if (!addr) {
1481                 VHOST_LOG_CONFIG(ERR,
1482                         "failed to alloc vhost inflight area\n");
1483                         msg->payload.inflight.mmap_size = 0;
1484                 return RTE_VHOST_MSG_RESULT_ERR;
1485         }
1486         memset(addr, 0, mmap_size);
1487
1488         if (dev->inflight_info->addr) {
1489                 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1490                 dev->inflight_info->addr = NULL;
1491         }
1492
1493         if (dev->inflight_info->fd >= 0) {
1494                 close(dev->inflight_info->fd);
1495                 dev->inflight_info->fd = -1;
1496         }
1497
1498         dev->inflight_info->addr = addr;
1499         dev->inflight_info->size = msg->payload.inflight.mmap_size = mmap_size;
1500         dev->inflight_info->fd = msg->fds[0] = fd;
1501         msg->payload.inflight.mmap_offset = 0;
1502         msg->fd_num = 1;
1503
1504         if (vq_is_packed(dev)) {
1505                 for (i = 0; i < num_queues; i++) {
1506                         inflight_packed =
1507                                 (struct rte_vhost_inflight_info_packed *)addr;
1508                         inflight_packed->used_wrap_counter = 1;
1509                         inflight_packed->old_used_wrap_counter = 1;
1510                         for (j = 0; j < queue_size; j++)
1511                                 inflight_packed->desc[j].next = j + 1;
1512                         addr = (void *)((char *)addr + pervq_inflight_size);
1513                 }
1514         }
1515
1516         VHOST_LOG_CONFIG(INFO,
1517                 "send inflight mmap_size: %"PRIu64"\n",
1518                 msg->payload.inflight.mmap_size);
1519         VHOST_LOG_CONFIG(INFO,
1520                 "send inflight mmap_offset: %"PRIu64"\n",
1521                 msg->payload.inflight.mmap_offset);
1522         VHOST_LOG_CONFIG(INFO,
1523                 "send inflight fd: %d\n", msg->fds[0]);
1524
1525         return RTE_VHOST_MSG_RESULT_REPLY;
1526 }
1527
1528 static int
1529 vhost_user_set_inflight_fd(struct virtio_net **pdev, VhostUserMsg *msg,
1530                            int main_fd __rte_unused)
1531 {
1532         uint64_t mmap_size, mmap_offset;
1533         uint16_t num_queues, queue_size;
1534         struct virtio_net *dev = *pdev;
1535         uint32_t pervq_inflight_size;
1536         struct vhost_virtqueue *vq;
1537         void *addr;
1538         int fd, i;
1539
1540         fd = msg->fds[0];
1541         if (msg->size != sizeof(msg->payload.inflight) || fd < 0) {
1542                 VHOST_LOG_CONFIG(ERR,
1543                         "invalid set_inflight_fd message size is %d,fd is %d\n",
1544                         msg->size, fd);
1545                 return RTE_VHOST_MSG_RESULT_ERR;
1546         }
1547
1548         mmap_size = msg->payload.inflight.mmap_size;
1549         mmap_offset = msg->payload.inflight.mmap_offset;
1550         num_queues = msg->payload.inflight.num_queues;
1551         queue_size = msg->payload.inflight.queue_size;
1552
1553         if (vq_is_packed(dev))
1554                 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1555         else
1556                 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1557
1558         VHOST_LOG_CONFIG(INFO,
1559                 "set_inflight_fd mmap_size: %"PRIu64"\n", mmap_size);
1560         VHOST_LOG_CONFIG(INFO,
1561                 "set_inflight_fd mmap_offset: %"PRIu64"\n", mmap_offset);
1562         VHOST_LOG_CONFIG(INFO,
1563                 "set_inflight_fd num_queues: %u\n", num_queues);
1564         VHOST_LOG_CONFIG(INFO,
1565                 "set_inflight_fd queue_size: %u\n", queue_size);
1566         VHOST_LOG_CONFIG(INFO,
1567                 "set_inflight_fd fd: %d\n", fd);
1568         VHOST_LOG_CONFIG(INFO,
1569                 "set_inflight_fd pervq_inflight_size: %d\n",
1570                 pervq_inflight_size);
1571
1572         if (!dev->inflight_info) {
1573                 dev->inflight_info = calloc(1,
1574                                             sizeof(struct inflight_mem_info));
1575                 if (dev->inflight_info == NULL) {
1576                         VHOST_LOG_CONFIG(ERR,
1577                                 "failed to alloc dev inflight area\n");
1578                         return RTE_VHOST_MSG_RESULT_ERR;
1579                 }
1580                 dev->inflight_info->fd = -1;
1581         }
1582
1583         if (dev->inflight_info->addr) {
1584                 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1585                 dev->inflight_info->addr = NULL;
1586         }
1587
1588         addr = mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
1589                     fd, mmap_offset);
1590         if (addr == MAP_FAILED) {
1591                 VHOST_LOG_CONFIG(ERR, "failed to mmap share memory.\n");
1592                 return RTE_VHOST_MSG_RESULT_ERR;
1593         }
1594
1595         if (dev->inflight_info->fd >= 0) {
1596                 close(dev->inflight_info->fd);
1597                 dev->inflight_info->fd = -1;
1598         }
1599
1600         dev->inflight_info->fd = fd;
1601         dev->inflight_info->addr = addr;
1602         dev->inflight_info->size = mmap_size;
1603
1604         for (i = 0; i < num_queues; i++) {
1605                 vq = dev->virtqueue[i];
1606                 if (vq_is_packed(dev)) {
1607                         vq->inflight_packed = addr;
1608                         vq->inflight_packed->desc_num = queue_size;
1609                 } else {
1610                         vq->inflight_split = addr;
1611                         vq->inflight_split->desc_num = queue_size;
1612                 }
1613                 addr = (void *)((char *)addr + pervq_inflight_size);
1614         }
1615
1616         return RTE_VHOST_MSG_RESULT_OK;
1617 }
1618
1619 static int
1620 vhost_user_set_vring_call(struct virtio_net **pdev, struct VhostUserMsg *msg,
1621                         int main_fd __rte_unused)
1622 {
1623         struct virtio_net *dev = *pdev;
1624         struct vhost_vring_file file;
1625         struct vhost_virtqueue *vq;
1626         int expected_fds;
1627
1628         expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1629         if (validate_msg_fds(msg, expected_fds) != 0)
1630                 return RTE_VHOST_MSG_RESULT_ERR;
1631
1632         file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1633         if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1634                 file.fd = VIRTIO_INVALID_EVENTFD;
1635         else
1636                 file.fd = msg->fds[0];
1637         VHOST_LOG_CONFIG(INFO,
1638                 "vring call idx:%d file:%d\n", file.index, file.fd);
1639
1640         vq = dev->virtqueue[file.index];
1641
1642         if (vq->ready) {
1643                 vhost_user_notify_queue_state(dev, file.index, 0);
1644                 vq->ready = 0;
1645         }
1646
1647         if (vq->callfd >= 0)
1648                 close(vq->callfd);
1649
1650         vq->callfd = file.fd;
1651
1652         return RTE_VHOST_MSG_RESULT_OK;
1653 }
1654
1655 static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused,
1656                         struct VhostUserMsg *msg,
1657                         int main_fd __rte_unused)
1658 {
1659         int expected_fds;
1660
1661         expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1662         if (validate_msg_fds(msg, expected_fds) != 0)
1663                 return RTE_VHOST_MSG_RESULT_ERR;
1664
1665         if (!(msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1666                 close(msg->fds[0]);
1667         VHOST_LOG_CONFIG(INFO, "not implemented\n");
1668
1669         return RTE_VHOST_MSG_RESULT_OK;
1670 }
1671
1672 static int
1673 resubmit_desc_compare(const void *a, const void *b)
1674 {
1675         const struct rte_vhost_resubmit_desc *desc0 = a;
1676         const struct rte_vhost_resubmit_desc *desc1 = b;
1677
1678         if (desc1->counter > desc0->counter)
1679                 return 1;
1680
1681         return -1;
1682 }
1683
1684 static int
1685 vhost_check_queue_inflights_split(struct virtio_net *dev,
1686                                   struct vhost_virtqueue *vq)
1687 {
1688         uint16_t i;
1689         uint16_t resubmit_num = 0, last_io, num;
1690         struct vring_used *used = vq->used;
1691         struct rte_vhost_resubmit_info *resubmit;
1692         struct rte_vhost_inflight_info_split *inflight_split;
1693
1694         if (!(dev->protocol_features &
1695             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1696                 return RTE_VHOST_MSG_RESULT_OK;
1697
1698         /* The frontend may still not support the inflight feature
1699          * although we negotiate the protocol feature.
1700          */
1701         if ((!vq->inflight_split))
1702                 return RTE_VHOST_MSG_RESULT_OK;
1703
1704         if (!vq->inflight_split->version) {
1705                 vq->inflight_split->version = INFLIGHT_VERSION;
1706                 return RTE_VHOST_MSG_RESULT_OK;
1707         }
1708
1709         if (vq->resubmit_inflight)
1710                 return RTE_VHOST_MSG_RESULT_OK;
1711
1712         inflight_split = vq->inflight_split;
1713         vq->global_counter = 0;
1714         last_io = inflight_split->last_inflight_io;
1715
1716         if (inflight_split->used_idx != used->idx) {
1717                 inflight_split->desc[last_io].inflight = 0;
1718                 rte_smp_mb();
1719                 inflight_split->used_idx = used->idx;
1720         }
1721
1722         for (i = 0; i < inflight_split->desc_num; i++) {
1723                 if (inflight_split->desc[i].inflight == 1)
1724                         resubmit_num++;
1725         }
1726
1727         vq->last_avail_idx += resubmit_num;
1728
1729         if (resubmit_num) {
1730                 resubmit  = calloc(1, sizeof(struct rte_vhost_resubmit_info));
1731                 if (!resubmit) {
1732                         VHOST_LOG_CONFIG(ERR,
1733                                 "failed to allocate memory for resubmit info.\n");
1734                         return RTE_VHOST_MSG_RESULT_ERR;
1735                 }
1736
1737                 resubmit->resubmit_list = calloc(resubmit_num,
1738                         sizeof(struct rte_vhost_resubmit_desc));
1739                 if (!resubmit->resubmit_list) {
1740                         VHOST_LOG_CONFIG(ERR,
1741                                 "failed to allocate memory for inflight desc.\n");
1742                         free(resubmit);
1743                         return RTE_VHOST_MSG_RESULT_ERR;
1744                 }
1745
1746                 num = 0;
1747                 for (i = 0; i < vq->inflight_split->desc_num; i++) {
1748                         if (vq->inflight_split->desc[i].inflight == 1) {
1749                                 resubmit->resubmit_list[num].index = i;
1750                                 resubmit->resubmit_list[num].counter =
1751                                         inflight_split->desc[i].counter;
1752                                 num++;
1753                         }
1754                 }
1755                 resubmit->resubmit_num = num;
1756
1757                 if (resubmit->resubmit_num > 1)
1758                         qsort(resubmit->resubmit_list, resubmit->resubmit_num,
1759                               sizeof(struct rte_vhost_resubmit_desc),
1760                               resubmit_desc_compare);
1761
1762                 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
1763                 vq->resubmit_inflight = resubmit;
1764         }
1765
1766         return RTE_VHOST_MSG_RESULT_OK;
1767 }
1768
1769 static int
1770 vhost_check_queue_inflights_packed(struct virtio_net *dev,
1771                                    struct vhost_virtqueue *vq)
1772 {
1773         uint16_t i;
1774         uint16_t resubmit_num = 0, old_used_idx, num;
1775         struct rte_vhost_resubmit_info *resubmit;
1776         struct rte_vhost_inflight_info_packed *inflight_packed;
1777
1778         if (!(dev->protocol_features &
1779             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1780                 return RTE_VHOST_MSG_RESULT_OK;
1781
1782         /* The frontend may still not support the inflight feature
1783          * although we negotiate the protocol feature.
1784          */
1785         if ((!vq->inflight_packed))
1786                 return RTE_VHOST_MSG_RESULT_OK;
1787
1788         if (!vq->inflight_packed->version) {
1789                 vq->inflight_packed->version = INFLIGHT_VERSION;
1790                 return RTE_VHOST_MSG_RESULT_OK;
1791         }
1792
1793         if (vq->resubmit_inflight)
1794                 return RTE_VHOST_MSG_RESULT_OK;
1795
1796         inflight_packed = vq->inflight_packed;
1797         vq->global_counter = 0;
1798         old_used_idx = inflight_packed->old_used_idx;
1799
1800         if (inflight_packed->used_idx != old_used_idx) {
1801                 if (inflight_packed->desc[old_used_idx].inflight == 0) {
1802                         inflight_packed->old_used_idx =
1803                                 inflight_packed->used_idx;
1804                         inflight_packed->old_used_wrap_counter =
1805                                 inflight_packed->used_wrap_counter;
1806                         inflight_packed->old_free_head =
1807                                 inflight_packed->free_head;
1808                 } else {
1809                         inflight_packed->used_idx =
1810                                 inflight_packed->old_used_idx;
1811                         inflight_packed->used_wrap_counter =
1812                                 inflight_packed->old_used_wrap_counter;
1813                         inflight_packed->free_head =
1814                                 inflight_packed->old_free_head;
1815                 }
1816         }
1817
1818         for (i = 0; i < inflight_packed->desc_num; i++) {
1819                 if (inflight_packed->desc[i].inflight == 1)
1820                         resubmit_num++;
1821         }
1822
1823         if (resubmit_num) {
1824                 resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info));
1825                 if (resubmit == NULL) {
1826                         VHOST_LOG_CONFIG(ERR,
1827                                 "failed to allocate memory for resubmit info.\n");
1828                         return RTE_VHOST_MSG_RESULT_ERR;
1829                 }
1830
1831                 resubmit->resubmit_list = calloc(resubmit_num,
1832                         sizeof(struct rte_vhost_resubmit_desc));
1833                 if (resubmit->resubmit_list == NULL) {
1834                         VHOST_LOG_CONFIG(ERR,
1835                                 "failed to allocate memory for resubmit desc.\n");
1836                         free(resubmit);
1837                         return RTE_VHOST_MSG_RESULT_ERR;
1838                 }
1839
1840                 num = 0;
1841                 for (i = 0; i < inflight_packed->desc_num; i++) {
1842                         if (vq->inflight_packed->desc[i].inflight == 1) {
1843                                 resubmit->resubmit_list[num].index = i;
1844                                 resubmit->resubmit_list[num].counter =
1845                                         inflight_packed->desc[i].counter;
1846                                 num++;
1847                         }
1848                 }
1849                 resubmit->resubmit_num = num;
1850
1851                 if (resubmit->resubmit_num > 1)
1852                         qsort(resubmit->resubmit_list, resubmit->resubmit_num,
1853                               sizeof(struct rte_vhost_resubmit_desc),
1854                               resubmit_desc_compare);
1855
1856                 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
1857                 vq->resubmit_inflight = resubmit;
1858         }
1859
1860         return RTE_VHOST_MSG_RESULT_OK;
1861 }
1862
1863 static int
1864 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
1865                         int main_fd __rte_unused)
1866 {
1867         struct virtio_net *dev = *pdev;
1868         struct vhost_vring_file file;
1869         struct vhost_virtqueue *vq;
1870         int expected_fds;
1871
1872         expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1873         if (validate_msg_fds(msg, expected_fds) != 0)
1874                 return RTE_VHOST_MSG_RESULT_ERR;
1875
1876         file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1877         if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1878                 file.fd = VIRTIO_INVALID_EVENTFD;
1879         else
1880                 file.fd = msg->fds[0];
1881         VHOST_LOG_CONFIG(INFO,
1882                 "vring kick idx:%d file:%d\n", file.index, file.fd);
1883
1884         /* Interpret ring addresses only when ring is started. */
1885         dev = translate_ring_addresses(dev, file.index);
1886         if (!dev)
1887                 return RTE_VHOST_MSG_RESULT_ERR;
1888
1889         *pdev = dev;
1890
1891         vq = dev->virtqueue[file.index];
1892
1893         /*
1894          * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
1895          * the ring starts already enabled. Otherwise, it is enabled via
1896          * the SET_VRING_ENABLE message.
1897          */
1898         if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
1899                 vq->enabled = 1;
1900                 if (dev->notify_ops->vring_state_changed)
1901                         dev->notify_ops->vring_state_changed(
1902                                 dev->vid, file.index, 1);
1903         }
1904
1905         if (vq->ready) {
1906                 vhost_user_notify_queue_state(dev, file.index, 0);
1907                 vq->ready = 0;
1908         }
1909
1910         if (vq->kickfd >= 0)
1911                 close(vq->kickfd);
1912         vq->kickfd = file.fd;
1913
1914         if (vq_is_packed(dev)) {
1915                 if (vhost_check_queue_inflights_packed(dev, vq)) {
1916                         VHOST_LOG_CONFIG(ERR,
1917                                 "failed to inflights for vq: %d\n", file.index);
1918                         return RTE_VHOST_MSG_RESULT_ERR;
1919                 }
1920         } else {
1921                 if (vhost_check_queue_inflights_split(dev, vq)) {
1922                         VHOST_LOG_CONFIG(ERR,
1923                                 "failed to inflights for vq: %d\n", file.index);
1924                         return RTE_VHOST_MSG_RESULT_ERR;
1925                 }
1926         }
1927
1928         return RTE_VHOST_MSG_RESULT_OK;
1929 }
1930
1931 static void
1932 free_zmbufs(struct vhost_virtqueue *vq)
1933 {
1934         drain_zmbuf_list(vq);
1935
1936         rte_free(vq->zmbufs);
1937         vq->zmbufs = NULL;
1938 }
1939
1940 /*
1941  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
1942  */
1943 static int
1944 vhost_user_get_vring_base(struct virtio_net **pdev,
1945                         struct VhostUserMsg *msg,
1946                         int main_fd __rte_unused)
1947 {
1948         struct virtio_net *dev = *pdev;
1949         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
1950         uint64_t val;
1951
1952         if (validate_msg_fds(msg, 0) != 0)
1953                 return RTE_VHOST_MSG_RESULT_ERR;
1954
1955         /* We have to stop the queue (virtio) if it is running. */
1956         vhost_destroy_device_notify(dev);
1957
1958         dev->flags &= ~VIRTIO_DEV_READY;
1959         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1960
1961         /* Here we are safe to get the indexes */
1962         if (vq_is_packed(dev)) {
1963                 /*
1964                  * Bit[0:14]: avail index
1965                  * Bit[15]: avail wrap counter
1966                  */
1967                 val = vq->last_avail_idx & 0x7fff;
1968                 val |= vq->avail_wrap_counter << 15;
1969                 msg->payload.state.num = val;
1970         } else {
1971                 msg->payload.state.num = vq->last_avail_idx;
1972         }
1973
1974         VHOST_LOG_CONFIG(INFO,
1975                 "vring base idx:%d file:%d\n", msg->payload.state.index,
1976                 msg->payload.state.num);
1977         /*
1978          * Based on current qemu vhost-user implementation, this message is
1979          * sent and only sent in vhost_vring_stop.
1980          * TODO: cleanup the vring, it isn't usable since here.
1981          */
1982         if (vq->kickfd >= 0)
1983                 close(vq->kickfd);
1984
1985         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
1986
1987         if (vq->callfd >= 0)
1988                 close(vq->callfd);
1989
1990         vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
1991
1992         vq->signalled_used_valid = false;
1993
1994         if (dev->dequeue_zero_copy)
1995                 free_zmbufs(vq);
1996         if (vq_is_packed(dev)) {
1997                 rte_free(vq->shadow_used_packed);
1998                 vq->shadow_used_packed = NULL;
1999         } else {
2000                 rte_free(vq->shadow_used_split);
2001                 vq->shadow_used_split = NULL;
2002                 if (vq->async_pkts_pending)
2003                         rte_free(vq->async_pkts_pending);
2004                 if (vq->async_pending_info)
2005                         rte_free(vq->async_pending_info);
2006                 vq->async_pkts_pending = NULL;
2007                 vq->async_pending_info = NULL;
2008         }
2009
2010         rte_free(vq->batch_copy_elems);
2011         vq->batch_copy_elems = NULL;
2012
2013         msg->size = sizeof(msg->payload.state);
2014         msg->fd_num = 0;
2015
2016         vring_invalidate(dev, vq);
2017
2018         return RTE_VHOST_MSG_RESULT_REPLY;
2019 }
2020
2021 /*
2022  * when virtio queues are ready to work, qemu will send us to
2023  * enable the virtio queue pair.
2024  */
2025 static int
2026 vhost_user_set_vring_enable(struct virtio_net **pdev,
2027                         struct VhostUserMsg *msg,
2028                         int main_fd __rte_unused)
2029 {
2030         struct virtio_net *dev = *pdev;
2031         int enable = (int)msg->payload.state.num;
2032         int index = (int)msg->payload.state.index;
2033
2034         if (validate_msg_fds(msg, 0) != 0)
2035                 return RTE_VHOST_MSG_RESULT_ERR;
2036
2037         VHOST_LOG_CONFIG(INFO,
2038                 "set queue enable: %d to qp idx: %d\n",
2039                 enable, index);
2040
2041         if (!enable && dev->virtqueue[index]->async_registered) {
2042                 if (dev->virtqueue[index]->async_pkts_inflight_n) {
2043                         VHOST_LOG_CONFIG(ERR, "failed to disable vring. "
2044                         "async inflight packets must be completed first\n");
2045                         return RTE_VHOST_MSG_RESULT_ERR;
2046                 }
2047         }
2048
2049         /* On disable, rings have to be stopped being processed. */
2050         if (!enable && dev->dequeue_zero_copy)
2051                 drain_zmbuf_list(dev->virtqueue[index]);
2052
2053         dev->virtqueue[index]->enabled = enable;
2054
2055         return RTE_VHOST_MSG_RESULT_OK;
2056 }
2057
2058 static int
2059 vhost_user_get_protocol_features(struct virtio_net **pdev,
2060                         struct VhostUserMsg *msg,
2061                         int main_fd __rte_unused)
2062 {
2063         struct virtio_net *dev = *pdev;
2064         uint64_t features, protocol_features;
2065
2066         if (validate_msg_fds(msg, 0) != 0)
2067                 return RTE_VHOST_MSG_RESULT_ERR;
2068
2069         rte_vhost_driver_get_features(dev->ifname, &features);
2070         rte_vhost_driver_get_protocol_features(dev->ifname, &protocol_features);
2071
2072         msg->payload.u64 = protocol_features;
2073         msg->size = sizeof(msg->payload.u64);
2074         msg->fd_num = 0;
2075
2076         return RTE_VHOST_MSG_RESULT_REPLY;
2077 }
2078
2079 static int
2080 vhost_user_set_protocol_features(struct virtio_net **pdev,
2081                         struct VhostUserMsg *msg,
2082                         int main_fd __rte_unused)
2083 {
2084         struct virtio_net *dev = *pdev;
2085         uint64_t protocol_features = msg->payload.u64;
2086         uint64_t slave_protocol_features = 0;
2087
2088         if (validate_msg_fds(msg, 0) != 0)
2089                 return RTE_VHOST_MSG_RESULT_ERR;
2090
2091         rte_vhost_driver_get_protocol_features(dev->ifname,
2092                         &slave_protocol_features);
2093         if (protocol_features & ~slave_protocol_features) {
2094                 VHOST_LOG_CONFIG(ERR,
2095                         "(%d) received invalid protocol features.\n",
2096                         dev->vid);
2097                 return RTE_VHOST_MSG_RESULT_ERR;
2098         }
2099
2100         dev->protocol_features = protocol_features;
2101         VHOST_LOG_CONFIG(INFO,
2102                 "negotiated Vhost-user protocol features: 0x%" PRIx64 "\n",
2103                 dev->protocol_features);
2104
2105         return RTE_VHOST_MSG_RESULT_OK;
2106 }
2107
2108 static int
2109 vhost_user_set_log_base(struct virtio_net **pdev, struct VhostUserMsg *msg,
2110                         int main_fd __rte_unused)
2111 {
2112         struct virtio_net *dev = *pdev;
2113         int fd = msg->fds[0];
2114         uint64_t size, off;
2115         void *addr;
2116
2117         if (validate_msg_fds(msg, 1) != 0)
2118                 return RTE_VHOST_MSG_RESULT_ERR;
2119
2120         if (fd < 0) {
2121                 VHOST_LOG_CONFIG(ERR, "invalid log fd: %d\n", fd);
2122                 return RTE_VHOST_MSG_RESULT_ERR;
2123         }
2124
2125         if (msg->size != sizeof(VhostUserLog)) {
2126                 VHOST_LOG_CONFIG(ERR,
2127                         "invalid log base msg size: %"PRId32" != %d\n",
2128                         msg->size, (int)sizeof(VhostUserLog));
2129                 return RTE_VHOST_MSG_RESULT_ERR;
2130         }
2131
2132         size = msg->payload.log.mmap_size;
2133         off  = msg->payload.log.mmap_offset;
2134
2135         /* Check for mmap size and offset overflow. */
2136         if (off >= -size) {
2137                 VHOST_LOG_CONFIG(ERR,
2138                         "log offset %#"PRIx64" and log size %#"PRIx64" overflow\n",
2139                         off, size);
2140                 return RTE_VHOST_MSG_RESULT_ERR;
2141         }
2142
2143         VHOST_LOG_CONFIG(INFO,
2144                 "log mmap size: %"PRId64", offset: %"PRId64"\n",
2145                 size, off);
2146
2147         /*
2148          * mmap from 0 to workaround a hugepage mmap bug: mmap will
2149          * fail when offset is not page size aligned.
2150          */
2151         addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
2152         close(fd);
2153         if (addr == MAP_FAILED) {
2154                 VHOST_LOG_CONFIG(ERR, "mmap log base failed!\n");
2155                 return RTE_VHOST_MSG_RESULT_ERR;
2156         }
2157
2158         /*
2159          * Free previously mapped log memory on occasionally
2160          * multiple VHOST_USER_SET_LOG_BASE.
2161          */
2162         if (dev->log_addr) {
2163                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
2164         }
2165         dev->log_addr = (uint64_t)(uintptr_t)addr;
2166         dev->log_base = dev->log_addr + off;
2167         dev->log_size = size;
2168
2169         /*
2170          * The spec is not clear about it (yet), but QEMU doesn't expect
2171          * any payload in the reply.
2172          */
2173         msg->size = 0;
2174         msg->fd_num = 0;
2175
2176         return RTE_VHOST_MSG_RESULT_REPLY;
2177 }
2178
2179 static int vhost_user_set_log_fd(struct virtio_net **pdev __rte_unused,
2180                         struct VhostUserMsg *msg,
2181                         int main_fd __rte_unused)
2182 {
2183         if (validate_msg_fds(msg, 1) != 0)
2184                 return RTE_VHOST_MSG_RESULT_ERR;
2185
2186         close(msg->fds[0]);
2187         VHOST_LOG_CONFIG(INFO, "not implemented.\n");
2188
2189         return RTE_VHOST_MSG_RESULT_OK;
2190 }
2191
2192 /*
2193  * An rarp packet is constructed and broadcasted to notify switches about
2194  * the new location of the migrated VM, so that packets from outside will
2195  * not be lost after migration.
2196  *
2197  * However, we don't actually "send" a rarp packet here, instead, we set
2198  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
2199  */
2200 static int
2201 vhost_user_send_rarp(struct virtio_net **pdev, struct VhostUserMsg *msg,
2202                         int main_fd __rte_unused)
2203 {
2204         struct virtio_net *dev = *pdev;
2205         uint8_t *mac = (uint8_t *)&msg->payload.u64;
2206         struct rte_vdpa_device *vdpa_dev;
2207
2208         if (validate_msg_fds(msg, 0) != 0)
2209                 return RTE_VHOST_MSG_RESULT_ERR;
2210
2211         VHOST_LOG_CONFIG(DEBUG,
2212                 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
2213                 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
2214         memcpy(dev->mac.addr_bytes, mac, 6);
2215
2216         /*
2217          * Set the flag to inject a RARP broadcast packet at
2218          * rte_vhost_dequeue_burst().
2219          *
2220          * __ATOMIC_RELEASE ordering is for making sure the mac is
2221          * copied before the flag is set.
2222          */
2223         __atomic_store_n(&dev->broadcast_rarp, 1, __ATOMIC_RELEASE);
2224         vdpa_dev = dev->vdpa_dev;
2225         if (vdpa_dev && vdpa_dev->ops->migration_done)
2226                 vdpa_dev->ops->migration_done(dev->vid);
2227
2228         return RTE_VHOST_MSG_RESULT_OK;
2229 }
2230
2231 static int
2232 vhost_user_net_set_mtu(struct virtio_net **pdev, struct VhostUserMsg *msg,
2233                         int main_fd __rte_unused)
2234 {
2235         struct virtio_net *dev = *pdev;
2236
2237         if (validate_msg_fds(msg, 0) != 0)
2238                 return RTE_VHOST_MSG_RESULT_ERR;
2239
2240         if (msg->payload.u64 < VIRTIO_MIN_MTU ||
2241                         msg->payload.u64 > VIRTIO_MAX_MTU) {
2242                 VHOST_LOG_CONFIG(ERR, "Invalid MTU size (%"PRIu64")\n",
2243                                 msg->payload.u64);
2244
2245                 return RTE_VHOST_MSG_RESULT_ERR;
2246         }
2247
2248         dev->mtu = msg->payload.u64;
2249
2250         return RTE_VHOST_MSG_RESULT_OK;
2251 }
2252
2253 static int
2254 vhost_user_set_req_fd(struct virtio_net **pdev, struct VhostUserMsg *msg,
2255                         int main_fd __rte_unused)
2256 {
2257         struct virtio_net *dev = *pdev;
2258         int fd = msg->fds[0];
2259
2260         if (validate_msg_fds(msg, 1) != 0)
2261                 return RTE_VHOST_MSG_RESULT_ERR;
2262
2263         if (fd < 0) {
2264                 VHOST_LOG_CONFIG(ERR,
2265                                 "Invalid file descriptor for slave channel (%d)\n",
2266                                 fd);
2267                 return RTE_VHOST_MSG_RESULT_ERR;
2268         }
2269
2270         if (dev->slave_req_fd >= 0)
2271                 close(dev->slave_req_fd);
2272
2273         dev->slave_req_fd = fd;
2274
2275         return RTE_VHOST_MSG_RESULT_OK;
2276 }
2277
2278 static int
2279 is_vring_iotlb_split(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2280 {
2281         struct vhost_vring_addr *ra;
2282         uint64_t start, end, len;
2283
2284         start = imsg->iova;
2285         end = start + imsg->size;
2286
2287         ra = &vq->ring_addrs;
2288         len = sizeof(struct vring_desc) * vq->size;
2289         if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2290                 return 1;
2291
2292         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
2293         if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2294                 return 1;
2295
2296         len = sizeof(struct vring_used) +
2297                sizeof(struct vring_used_elem) * vq->size;
2298         if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2299                 return 1;
2300
2301         if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2302                 len = sizeof(uint64_t);
2303                 if (ra->log_guest_addr < end &&
2304                     (ra->log_guest_addr + len) > start)
2305                         return 1;
2306         }
2307
2308         return 0;
2309 }
2310
2311 static int
2312 is_vring_iotlb_packed(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2313 {
2314         struct vhost_vring_addr *ra;
2315         uint64_t start, end, len;
2316
2317         start = imsg->iova;
2318         end = start + imsg->size;
2319
2320         ra = &vq->ring_addrs;
2321         len = sizeof(struct vring_packed_desc) * vq->size;
2322         if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2323                 return 1;
2324
2325         len = sizeof(struct vring_packed_desc_event);
2326         if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2327                 return 1;
2328
2329         len = sizeof(struct vring_packed_desc_event);
2330         if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2331                 return 1;
2332
2333         if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2334                 len = sizeof(uint64_t);
2335                 if (ra->log_guest_addr < end &&
2336                     (ra->log_guest_addr + len) > start)
2337                         return 1;
2338         }
2339
2340         return 0;
2341 }
2342
2343 static int is_vring_iotlb(struct virtio_net *dev,
2344                           struct vhost_virtqueue *vq,
2345                           struct vhost_iotlb_msg *imsg)
2346 {
2347         if (vq_is_packed(dev))
2348                 return is_vring_iotlb_packed(vq, imsg);
2349         else
2350                 return is_vring_iotlb_split(vq, imsg);
2351 }
2352
2353 static int
2354 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg,
2355                         int main_fd __rte_unused)
2356 {
2357         struct virtio_net *dev = *pdev;
2358         struct vhost_iotlb_msg *imsg = &msg->payload.iotlb;
2359         uint16_t i;
2360         uint64_t vva, len;
2361
2362         if (validate_msg_fds(msg, 0) != 0)
2363                 return RTE_VHOST_MSG_RESULT_ERR;
2364
2365         switch (imsg->type) {
2366         case VHOST_IOTLB_UPDATE:
2367                 len = imsg->size;
2368                 vva = qva_to_vva(dev, imsg->uaddr, &len);
2369                 if (!vva)
2370                         return RTE_VHOST_MSG_RESULT_ERR;
2371
2372                 for (i = 0; i < dev->nr_vring; i++) {
2373                         struct vhost_virtqueue *vq = dev->virtqueue[i];
2374
2375                         vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
2376                                         len, imsg->perm);
2377
2378                         if (is_vring_iotlb(dev, vq, imsg))
2379                                 *pdev = dev = translate_ring_addresses(dev, i);
2380                 }
2381                 break;
2382         case VHOST_IOTLB_INVALIDATE:
2383                 for (i = 0; i < dev->nr_vring; i++) {
2384                         struct vhost_virtqueue *vq = dev->virtqueue[i];
2385
2386                         vhost_user_iotlb_cache_remove(vq, imsg->iova,
2387                                         imsg->size);
2388
2389                         if (is_vring_iotlb(dev, vq, imsg))
2390                                 vring_invalidate(dev, vq);
2391                 }
2392                 break;
2393         default:
2394                 VHOST_LOG_CONFIG(ERR, "Invalid IOTLB message type (%d)\n",
2395                                 imsg->type);
2396                 return RTE_VHOST_MSG_RESULT_ERR;
2397         }
2398
2399         return RTE_VHOST_MSG_RESULT_OK;
2400 }
2401
2402 static int
2403 vhost_user_set_postcopy_advise(struct virtio_net **pdev,
2404                         struct VhostUserMsg *msg,
2405                         int main_fd __rte_unused)
2406 {
2407         struct virtio_net *dev = *pdev;
2408 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
2409         struct uffdio_api api_struct;
2410
2411         if (validate_msg_fds(msg, 0) != 0)
2412                 return RTE_VHOST_MSG_RESULT_ERR;
2413
2414         dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
2415
2416         if (dev->postcopy_ufd == -1) {
2417                 VHOST_LOG_CONFIG(ERR, "Userfaultfd not available: %s\n",
2418                         strerror(errno));
2419                 return RTE_VHOST_MSG_RESULT_ERR;
2420         }
2421         api_struct.api = UFFD_API;
2422         api_struct.features = 0;
2423         if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) {
2424                 VHOST_LOG_CONFIG(ERR, "UFFDIO_API ioctl failure: %s\n",
2425                         strerror(errno));
2426                 close(dev->postcopy_ufd);
2427                 dev->postcopy_ufd = -1;
2428                 return RTE_VHOST_MSG_RESULT_ERR;
2429         }
2430         msg->fds[0] = dev->postcopy_ufd;
2431         msg->fd_num = 1;
2432
2433         return RTE_VHOST_MSG_RESULT_REPLY;
2434 #else
2435         dev->postcopy_ufd = -1;
2436         msg->fd_num = 0;
2437
2438         return RTE_VHOST_MSG_RESULT_ERR;
2439 #endif
2440 }
2441
2442 static int
2443 vhost_user_set_postcopy_listen(struct virtio_net **pdev,
2444                         struct VhostUserMsg *msg __rte_unused,
2445                         int main_fd __rte_unused)
2446 {
2447         struct virtio_net *dev = *pdev;
2448
2449         if (validate_msg_fds(msg, 0) != 0)
2450                 return RTE_VHOST_MSG_RESULT_ERR;
2451
2452         if (dev->mem && dev->mem->nregions) {
2453                 VHOST_LOG_CONFIG(ERR,
2454                         "Regions already registered at postcopy-listen\n");
2455                 return RTE_VHOST_MSG_RESULT_ERR;
2456         }
2457         dev->postcopy_listening = 1;
2458
2459         return RTE_VHOST_MSG_RESULT_OK;
2460 }
2461
2462 static int
2463 vhost_user_postcopy_end(struct virtio_net **pdev, struct VhostUserMsg *msg,
2464                         int main_fd __rte_unused)
2465 {
2466         struct virtio_net *dev = *pdev;
2467
2468         if (validate_msg_fds(msg, 0) != 0)
2469                 return RTE_VHOST_MSG_RESULT_ERR;
2470
2471         dev->postcopy_listening = 0;
2472         if (dev->postcopy_ufd >= 0) {
2473                 close(dev->postcopy_ufd);
2474                 dev->postcopy_ufd = -1;
2475         }
2476
2477         msg->payload.u64 = 0;
2478         msg->size = sizeof(msg->payload.u64);
2479         msg->fd_num = 0;
2480
2481         return RTE_VHOST_MSG_RESULT_REPLY;
2482 }
2483
2484 static int
2485 vhost_user_get_status(struct virtio_net **pdev, struct VhostUserMsg *msg,
2486                       int main_fd __rte_unused)
2487 {
2488         struct virtio_net *dev = *pdev;
2489
2490         if (validate_msg_fds(msg, 0) != 0)
2491                 return RTE_VHOST_MSG_RESULT_ERR;
2492
2493         msg->payload.u64 = dev->status;
2494         msg->size = sizeof(msg->payload.u64);
2495         msg->fd_num = 0;
2496
2497         return RTE_VHOST_MSG_RESULT_REPLY;
2498 }
2499
2500 static int
2501 vhost_user_set_status(struct virtio_net **pdev, struct VhostUserMsg *msg,
2502                         int main_fd __rte_unused)
2503 {
2504         struct virtio_net *dev = *pdev;
2505
2506         if (validate_msg_fds(msg, 0) != 0)
2507                 return RTE_VHOST_MSG_RESULT_ERR;
2508
2509         /* As per Virtio specification, the device status is 8bits long */
2510         if (msg->payload.u64 > UINT8_MAX) {
2511                 VHOST_LOG_CONFIG(ERR, "Invalid VHOST_USER_SET_STATUS payload 0x%" PRIx64 "\n",
2512                                 msg->payload.u64);
2513                 return RTE_VHOST_MSG_RESULT_ERR;
2514         }
2515
2516         dev->status = msg->payload.u64;
2517
2518         if ((dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK) &&
2519             (dev->flags & VIRTIO_DEV_FEATURES_FAILED)) {
2520                 VHOST_LOG_CONFIG(ERR, "FEATURES_OK bit is set but feature negotiation failed\n");
2521                 /*
2522                  * Clear the bit to let the driver know about the feature
2523                  * negotiation failure
2524                  */
2525                 dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK;
2526         }
2527
2528         VHOST_LOG_CONFIG(INFO, "New device status(0x%08x):\n"
2529                         "\t-ACKNOWLEDGE: %u\n"
2530                         "\t-DRIVER: %u\n"
2531                         "\t-FEATURES_OK: %u\n"
2532                         "\t-DRIVER_OK: %u\n"
2533                         "\t-DEVICE_NEED_RESET: %u\n"
2534                         "\t-FAILED: %u\n",
2535                         dev->status,
2536                         !!(dev->status & VIRTIO_DEVICE_STATUS_ACK),
2537                         !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER),
2538                         !!(dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK),
2539                         !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK),
2540                         !!(dev->status & VIRTIO_DEVICE_STATUS_DEV_NEED_RESET),
2541                         !!(dev->status & VIRTIO_DEVICE_STATUS_FAILED));
2542
2543         return RTE_VHOST_MSG_RESULT_OK;
2544 }
2545
2546 typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
2547                                         struct VhostUserMsg *msg,
2548                                         int main_fd);
2549 static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = {
2550         [VHOST_USER_NONE] = NULL,
2551         [VHOST_USER_GET_FEATURES] = vhost_user_get_features,
2552         [VHOST_USER_SET_FEATURES] = vhost_user_set_features,
2553         [VHOST_USER_SET_OWNER] = vhost_user_set_owner,
2554         [VHOST_USER_RESET_OWNER] = vhost_user_reset_owner,
2555         [VHOST_USER_SET_MEM_TABLE] = vhost_user_set_mem_table,
2556         [VHOST_USER_SET_LOG_BASE] = vhost_user_set_log_base,
2557         [VHOST_USER_SET_LOG_FD] = vhost_user_set_log_fd,
2558         [VHOST_USER_SET_VRING_NUM] = vhost_user_set_vring_num,
2559         [VHOST_USER_SET_VRING_ADDR] = vhost_user_set_vring_addr,
2560         [VHOST_USER_SET_VRING_BASE] = vhost_user_set_vring_base,
2561         [VHOST_USER_GET_VRING_BASE] = vhost_user_get_vring_base,
2562         [VHOST_USER_SET_VRING_KICK] = vhost_user_set_vring_kick,
2563         [VHOST_USER_SET_VRING_CALL] = vhost_user_set_vring_call,
2564         [VHOST_USER_SET_VRING_ERR] = vhost_user_set_vring_err,
2565         [VHOST_USER_GET_PROTOCOL_FEATURES] = vhost_user_get_protocol_features,
2566         [VHOST_USER_SET_PROTOCOL_FEATURES] = vhost_user_set_protocol_features,
2567         [VHOST_USER_GET_QUEUE_NUM] = vhost_user_get_queue_num,
2568         [VHOST_USER_SET_VRING_ENABLE] = vhost_user_set_vring_enable,
2569         [VHOST_USER_SEND_RARP] = vhost_user_send_rarp,
2570         [VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
2571         [VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
2572         [VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
2573         [VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
2574         [VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
2575         [VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
2576         [VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd,
2577         [VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd,
2578         [VHOST_USER_SET_STATUS] = vhost_user_set_status,
2579         [VHOST_USER_GET_STATUS] = vhost_user_get_status,
2580 };
2581
2582 /* return bytes# of read on success or negative val on failure. */
2583 static int
2584 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
2585 {
2586         int ret;
2587
2588         ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
2589                 msg->fds, VHOST_MEMORY_MAX_NREGIONS, &msg->fd_num);
2590         if (ret <= 0) {
2591                 return ret;
2592         } else if (ret != VHOST_USER_HDR_SIZE) {
2593                 VHOST_LOG_CONFIG(ERR, "Unexpected header size read\n");
2594                 close_msg_fds(msg);
2595                 return -1;
2596         }
2597
2598         if (msg->size) {
2599                 if (msg->size > sizeof(msg->payload)) {
2600                         VHOST_LOG_CONFIG(ERR,
2601                                 "invalid msg size: %d\n", msg->size);
2602                         return -1;
2603                 }
2604                 ret = read(sockfd, &msg->payload, msg->size);
2605                 if (ret <= 0)
2606                         return ret;
2607                 if (ret != (int)msg->size) {
2608                         VHOST_LOG_CONFIG(ERR,
2609                                 "read control message failed\n");
2610                         return -1;
2611                 }
2612         }
2613
2614         return ret;
2615 }
2616
2617 static int
2618 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
2619 {
2620         if (!msg)
2621                 return 0;
2622
2623         return send_fd_message(sockfd, (char *)msg,
2624                 VHOST_USER_HDR_SIZE + msg->size, msg->fds, msg->fd_num);
2625 }
2626
2627 static int
2628 send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
2629 {
2630         if (!msg)
2631                 return 0;
2632
2633         msg->flags &= ~VHOST_USER_VERSION_MASK;
2634         msg->flags &= ~VHOST_USER_NEED_REPLY;
2635         msg->flags |= VHOST_USER_VERSION;
2636         msg->flags |= VHOST_USER_REPLY_MASK;
2637
2638         return send_vhost_message(sockfd, msg);
2639 }
2640
2641 static int
2642 send_vhost_slave_message(struct virtio_net *dev, struct VhostUserMsg *msg)
2643 {
2644         int ret;
2645
2646         if (msg->flags & VHOST_USER_NEED_REPLY)
2647                 rte_spinlock_lock(&dev->slave_req_lock);
2648
2649         ret = send_vhost_message(dev->slave_req_fd, msg);
2650         if (ret < 0 && (msg->flags & VHOST_USER_NEED_REPLY))
2651                 rte_spinlock_unlock(&dev->slave_req_lock);
2652
2653         return ret;
2654 }
2655
2656 /*
2657  * Allocate a queue pair if it hasn't been allocated yet
2658  */
2659 static int
2660 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
2661                         struct VhostUserMsg *msg)
2662 {
2663         uint32_t vring_idx;
2664
2665         switch (msg->request.master) {
2666         case VHOST_USER_SET_VRING_KICK:
2667         case VHOST_USER_SET_VRING_CALL:
2668         case VHOST_USER_SET_VRING_ERR:
2669                 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
2670                 break;
2671         case VHOST_USER_SET_VRING_NUM:
2672         case VHOST_USER_SET_VRING_BASE:
2673         case VHOST_USER_SET_VRING_ENABLE:
2674                 vring_idx = msg->payload.state.index;
2675                 break;
2676         case VHOST_USER_SET_VRING_ADDR:
2677                 vring_idx = msg->payload.addr.index;
2678                 break;
2679         default:
2680                 return 0;
2681         }
2682
2683         if (vring_idx >= VHOST_MAX_VRING) {
2684                 VHOST_LOG_CONFIG(ERR,
2685                         "invalid vring index: %u\n", vring_idx);
2686                 return -1;
2687         }
2688
2689         if (dev->virtqueue[vring_idx])
2690                 return 0;
2691
2692         return alloc_vring_queue(dev, vring_idx);
2693 }
2694
2695 static void
2696 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
2697 {
2698         unsigned int i = 0;
2699         unsigned int vq_num = 0;
2700
2701         while (vq_num < dev->nr_vring) {
2702                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2703
2704                 if (vq) {
2705                         rte_spinlock_lock(&vq->access_lock);
2706                         vq_num++;
2707                 }
2708                 i++;
2709         }
2710 }
2711
2712 static void
2713 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
2714 {
2715         unsigned int i = 0;
2716         unsigned int vq_num = 0;
2717
2718         while (vq_num < dev->nr_vring) {
2719                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2720
2721                 if (vq) {
2722                         rte_spinlock_unlock(&vq->access_lock);
2723                         vq_num++;
2724                 }
2725                 i++;
2726         }
2727 }
2728
2729 int
2730 vhost_user_msg_handler(int vid, int fd)
2731 {
2732         struct virtio_net *dev;
2733         struct VhostUserMsg msg;
2734         struct rte_vdpa_device *vdpa_dev;
2735         int ret;
2736         int unlock_required = 0;
2737         bool handled;
2738         int request;
2739         uint32_t i;
2740
2741         dev = get_device(vid);
2742         if (dev == NULL)
2743                 return -1;
2744
2745         if (!dev->notify_ops) {
2746                 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
2747                 if (!dev->notify_ops) {
2748                         VHOST_LOG_CONFIG(ERR,
2749                                 "failed to get callback ops for driver %s\n",
2750                                 dev->ifname);
2751                         return -1;
2752                 }
2753         }
2754
2755         ret = read_vhost_message(fd, &msg);
2756         if (ret <= 0) {
2757                 if (ret < 0)
2758                         VHOST_LOG_CONFIG(ERR,
2759                                 "vhost read message failed\n");
2760                 else
2761                         VHOST_LOG_CONFIG(INFO,
2762                                 "vhost peer closed\n");
2763
2764                 return -1;
2765         }
2766
2767         ret = 0;
2768         request = msg.request.master;
2769         if (request > VHOST_USER_NONE && request < VHOST_USER_MAX &&
2770                         vhost_message_str[request]) {
2771                 if (request != VHOST_USER_IOTLB_MSG)
2772                         VHOST_LOG_CONFIG(INFO, "read message %s\n",
2773                                 vhost_message_str[request]);
2774                 else
2775                         VHOST_LOG_CONFIG(DEBUG, "read message %s\n",
2776                                 vhost_message_str[request]);
2777         } else {
2778                 VHOST_LOG_CONFIG(DEBUG, "External request %d\n", request);
2779         }
2780
2781         ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
2782         if (ret < 0) {
2783                 VHOST_LOG_CONFIG(ERR,
2784                         "failed to alloc queue\n");
2785                 return -1;
2786         }
2787
2788         /*
2789          * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
2790          * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
2791          * and device is destroyed. destroy_device waits for queues to be
2792          * inactive, so it is safe. Otherwise taking the access_lock
2793          * would cause a dead lock.
2794          */
2795         switch (request) {
2796         case VHOST_USER_SET_FEATURES:
2797         case VHOST_USER_SET_PROTOCOL_FEATURES:
2798         case VHOST_USER_SET_OWNER:
2799         case VHOST_USER_SET_MEM_TABLE:
2800         case VHOST_USER_SET_LOG_BASE:
2801         case VHOST_USER_SET_LOG_FD:
2802         case VHOST_USER_SET_VRING_NUM:
2803         case VHOST_USER_SET_VRING_ADDR:
2804         case VHOST_USER_SET_VRING_BASE:
2805         case VHOST_USER_SET_VRING_KICK:
2806         case VHOST_USER_SET_VRING_CALL:
2807         case VHOST_USER_SET_VRING_ERR:
2808         case VHOST_USER_SET_VRING_ENABLE:
2809         case VHOST_USER_SEND_RARP:
2810         case VHOST_USER_NET_SET_MTU:
2811         case VHOST_USER_SET_SLAVE_REQ_FD:
2812                 if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
2813                         vhost_user_lock_all_queue_pairs(dev);
2814                         unlock_required = 1;
2815                 }
2816                 break;
2817         default:
2818                 break;
2819
2820         }
2821
2822         handled = false;
2823         if (dev->extern_ops.pre_msg_handle) {
2824                 ret = (*dev->extern_ops.pre_msg_handle)(dev->vid,
2825                                 (void *)&msg);
2826                 switch (ret) {
2827                 case RTE_VHOST_MSG_RESULT_REPLY:
2828                         send_vhost_reply(fd, &msg);
2829                         /* Fall-through */
2830                 case RTE_VHOST_MSG_RESULT_ERR:
2831                 case RTE_VHOST_MSG_RESULT_OK:
2832                         handled = true;
2833                         goto skip_to_post_handle;
2834                 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
2835                 default:
2836                         break;
2837                 }
2838         }
2839
2840         if (request > VHOST_USER_NONE && request < VHOST_USER_MAX) {
2841                 if (!vhost_message_handlers[request])
2842                         goto skip_to_post_handle;
2843                 ret = vhost_message_handlers[request](&dev, &msg, fd);
2844
2845                 switch (ret) {
2846                 case RTE_VHOST_MSG_RESULT_ERR:
2847                         VHOST_LOG_CONFIG(ERR,
2848                                 "Processing %s failed.\n",
2849                                 vhost_message_str[request]);
2850                         handled = true;
2851                         break;
2852                 case RTE_VHOST_MSG_RESULT_OK:
2853                         VHOST_LOG_CONFIG(DEBUG,
2854                                 "Processing %s succeeded.\n",
2855                                 vhost_message_str[request]);
2856                         handled = true;
2857                         break;
2858                 case RTE_VHOST_MSG_RESULT_REPLY:
2859                         VHOST_LOG_CONFIG(DEBUG,
2860                                 "Processing %s succeeded and needs reply.\n",
2861                                 vhost_message_str[request]);
2862                         send_vhost_reply(fd, &msg);
2863                         handled = true;
2864                         break;
2865                 default:
2866                         break;
2867                 }
2868         }
2869
2870 skip_to_post_handle:
2871         if (ret != RTE_VHOST_MSG_RESULT_ERR &&
2872                         dev->extern_ops.post_msg_handle) {
2873                 ret = (*dev->extern_ops.post_msg_handle)(dev->vid,
2874                                 (void *)&msg);
2875                 switch (ret) {
2876                 case RTE_VHOST_MSG_RESULT_REPLY:
2877                         send_vhost_reply(fd, &msg);
2878                         /* Fall-through */
2879                 case RTE_VHOST_MSG_RESULT_ERR:
2880                 case RTE_VHOST_MSG_RESULT_OK:
2881                         handled = true;
2882                 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
2883                 default:
2884                         break;
2885                 }
2886         }
2887
2888         if (unlock_required)
2889                 vhost_user_unlock_all_queue_pairs(dev);
2890
2891         /* If message was not handled at this stage, treat it as an error */
2892         if (!handled) {
2893                 VHOST_LOG_CONFIG(ERR,
2894                         "vhost message (req: %d) was not handled.\n", request);
2895                 close_msg_fds(&msg);
2896                 ret = RTE_VHOST_MSG_RESULT_ERR;
2897         }
2898
2899         /*
2900          * If the request required a reply that was already sent,
2901          * this optional reply-ack won't be sent as the
2902          * VHOST_USER_NEED_REPLY was cleared in send_vhost_reply().
2903          */
2904         if (msg.flags & VHOST_USER_NEED_REPLY) {
2905                 msg.payload.u64 = ret == RTE_VHOST_MSG_RESULT_ERR;
2906                 msg.size = sizeof(msg.payload.u64);
2907                 msg.fd_num = 0;
2908                 send_vhost_reply(fd, &msg);
2909         } else if (ret == RTE_VHOST_MSG_RESULT_ERR) {
2910                 VHOST_LOG_CONFIG(ERR,
2911                         "vhost message handling failed.\n");
2912                 return -1;
2913         }
2914
2915         for (i = 0; i < dev->nr_vring; i++) {
2916                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2917                 bool cur_ready = vq_is_ready(dev, vq);
2918
2919                 if (cur_ready != (vq && vq->ready)) {
2920                         vhost_user_notify_queue_state(dev, i, cur_ready);
2921                         vq->ready = cur_ready;
2922                 }
2923         }
2924
2925
2926         if (!virtio_is_ready(dev))
2927                 goto out;
2928
2929         /*
2930          * Virtio is now ready. If not done already, it is time
2931          * to notify the application it can process the rings and
2932          * configure the vDPA device if present.
2933          */
2934
2935         if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
2936                 if (dev->notify_ops->new_device(dev->vid) == 0)
2937                         dev->flags |= VIRTIO_DEV_RUNNING;
2938         }
2939
2940         vdpa_dev = dev->vdpa_dev;
2941         if (!vdpa_dev)
2942                 goto out;
2943
2944         if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
2945                 if (vdpa_dev->ops->dev_conf(dev->vid))
2946                         VHOST_LOG_CONFIG(ERR,
2947                                          "Failed to configure vDPA device\n");
2948                 else
2949                         dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
2950         }
2951
2952 out:
2953         return 0;
2954 }
2955
2956 static int process_slave_message_reply(struct virtio_net *dev,
2957                                        const struct VhostUserMsg *msg)
2958 {
2959         struct VhostUserMsg msg_reply;
2960         int ret;
2961
2962         if ((msg->flags & VHOST_USER_NEED_REPLY) == 0)
2963                 return 0;
2964
2965         ret = read_vhost_message(dev->slave_req_fd, &msg_reply);
2966         if (ret <= 0) {
2967                 if (ret < 0)
2968                         VHOST_LOG_CONFIG(ERR,
2969                                 "vhost read slave message reply failed\n");
2970                 else
2971                         VHOST_LOG_CONFIG(INFO,
2972                                 "vhost peer closed\n");
2973                 ret = -1;
2974                 goto out;
2975         }
2976
2977         ret = 0;
2978         if (msg_reply.request.slave != msg->request.slave) {
2979                 VHOST_LOG_CONFIG(ERR,
2980                         "Received unexpected msg type (%u), expected %u\n",
2981                         msg_reply.request.slave, msg->request.slave);
2982                 ret = -1;
2983                 goto out;
2984         }
2985
2986         ret = msg_reply.payload.u64 ? -1 : 0;
2987
2988 out:
2989         rte_spinlock_unlock(&dev->slave_req_lock);
2990         return ret;
2991 }
2992
2993 int
2994 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
2995 {
2996         int ret;
2997         struct VhostUserMsg msg = {
2998                 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
2999                 .flags = VHOST_USER_VERSION,
3000                 .size = sizeof(msg.payload.iotlb),
3001                 .payload.iotlb = {
3002                         .iova = iova,
3003                         .perm = perm,
3004                         .type = VHOST_IOTLB_MISS,
3005                 },
3006         };
3007
3008         ret = send_vhost_message(dev->slave_req_fd, &msg);
3009         if (ret < 0) {
3010                 VHOST_LOG_CONFIG(ERR,
3011                                 "Failed to send IOTLB miss message (%d)\n",
3012                                 ret);
3013                 return ret;
3014         }
3015
3016         return 0;
3017 }
3018
3019 static int
3020 vhost_user_slave_config_change(struct virtio_net *dev, bool need_reply)
3021 {
3022         int ret;
3023         struct VhostUserMsg msg = {
3024                 .request.slave = VHOST_USER_SLAVE_CONFIG_CHANGE_MSG,
3025                 .flags = VHOST_USER_VERSION,
3026                 .size = 0,
3027         };
3028
3029         if (need_reply)
3030                 msg.flags |= VHOST_USER_NEED_REPLY;
3031
3032         ret = send_vhost_slave_message(dev, &msg);
3033         if (ret < 0) {
3034                 VHOST_LOG_CONFIG(ERR,
3035                                 "Failed to send config change (%d)\n",
3036                                 ret);
3037                 return ret;
3038         }
3039
3040         return process_slave_message_reply(dev, &msg);
3041 }
3042
3043 int
3044 rte_vhost_slave_config_change(int vid, bool need_reply)
3045 {
3046         struct virtio_net *dev;
3047
3048         dev = get_device(vid);
3049         if (!dev)
3050                 return -ENODEV;
3051
3052         return vhost_user_slave_config_change(dev, need_reply);
3053 }
3054
3055 static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev,
3056                                                     int index, int fd,
3057                                                     uint64_t offset,
3058                                                     uint64_t size)
3059 {
3060         int ret;
3061         struct VhostUserMsg msg = {
3062                 .request.slave = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
3063                 .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY,
3064                 .size = sizeof(msg.payload.area),
3065                 .payload.area = {
3066                         .u64 = index & VHOST_USER_VRING_IDX_MASK,
3067                         .size = size,
3068                         .offset = offset,
3069                 },
3070         };
3071
3072         if (fd < 0)
3073                 msg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK;
3074         else {
3075                 msg.fds[0] = fd;
3076                 msg.fd_num = 1;
3077         }
3078
3079         ret = send_vhost_slave_message(dev, &msg);
3080         if (ret < 0) {
3081                 VHOST_LOG_CONFIG(ERR,
3082                         "Failed to set host notifier (%d)\n", ret);
3083                 return ret;
3084         }
3085
3086         return process_slave_message_reply(dev, &msg);
3087 }
3088
3089 int rte_vhost_host_notifier_ctrl(int vid, uint16_t qid, bool enable)
3090 {
3091         struct virtio_net *dev;
3092         struct rte_vdpa_device *vdpa_dev;
3093         int vfio_device_fd, ret = 0;
3094         uint64_t offset, size;
3095         unsigned int i, q_start, q_last;
3096
3097         dev = get_device(vid);
3098         if (!dev)
3099                 return -ENODEV;
3100
3101         vdpa_dev = dev->vdpa_dev;
3102         if (vdpa_dev == NULL)
3103                 return -ENODEV;
3104
3105         if (!(dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
3106             !(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) ||
3107             !(dev->protocol_features &
3108                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ)) ||
3109             !(dev->protocol_features &
3110                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) ||
3111             !(dev->protocol_features &
3112                         (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER)))
3113                 return -ENOTSUP;
3114
3115         if (qid == RTE_VHOST_QUEUE_ALL) {
3116                 q_start = 0;
3117                 q_last = dev->nr_vring - 1;
3118         } else {
3119                 if (qid >= dev->nr_vring)
3120                         return -EINVAL;
3121                 q_start = qid;
3122                 q_last = qid;
3123         }
3124
3125         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP);
3126         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP);
3127
3128         vfio_device_fd = vdpa_dev->ops->get_vfio_device_fd(vid);
3129         if (vfio_device_fd < 0)
3130                 return -ENOTSUP;
3131
3132         if (enable) {
3133                 for (i = q_start; i <= q_last; i++) {
3134                         if (vdpa_dev->ops->get_notify_area(vid, i, &offset,
3135                                         &size) < 0) {
3136                                 ret = -ENOTSUP;
3137                                 goto disable;
3138                         }
3139
3140                         if (vhost_user_slave_set_vring_host_notifier(dev, i,
3141                                         vfio_device_fd, offset, size) < 0) {
3142                                 ret = -EFAULT;
3143                                 goto disable;
3144                         }
3145                 }
3146         } else {
3147 disable:
3148                 for (i = q_start; i <= q_last; i++) {
3149                         vhost_user_slave_set_vring_host_notifier(dev, i, -1,
3150                                         0, 0);
3151                 }
3152         }
3153
3154         return ret;
3155 }