lib/librte_vhost/vhost.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2017 Intel Corporation
   3  */
   4
   5 #include <linux/vhost.h>
   6 #include <linux/virtio_net.h>
   7 #include <stddef.h>
   8 #include <stdint.h>
   9 #include <stdlib.h>
  10 #ifdef RTE_LIBRTE_VHOST_NUMA
  11 #include <numa.h>
  12 #include <numaif.h>
  13 #endif
  14
  15 #include <rte_errno.h>
  16 #include <rte_ethdev.h>
  17 #include <rte_log.h>
  18 #include <rte_string_fns.h>
  19 #include <rte_memory.h>
  20 #include <rte_malloc.h>
  21 #include <rte_vhost.h>
  22 #include <rte_rwlock.h>
  23
  24 #include "iotlb.h"
  25 #include "vhost.h"
  26 #include "vhost_user.h"
  27
  28 struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
  29
  30 /* Called with iotlb_lock read-locked */
  31 uint64_t
  32 __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
  33                     uint64_t iova, uint64_t *size, uint8_t perm)
  34 {
  35         uint64_t vva, tmp_size;
  36
  37         if (unlikely(!*size))
  38                 return 0;
  39
  40         tmp_size = *size;
  41
  42         vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
  43         if (tmp_size == *size)
  44                 return vva;
  45
  46         iova += tmp_size;
  47
  48         if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
  49                 /*
  50                  * iotlb_lock is read-locked for a full burst,
  51                  * but it only protects the iotlb cache.
  52                  * In case of IOTLB miss, we might block on the socket,
  53                  * which could cause a deadlock with QEMU if an IOTLB update
  54                  * is being handled. We can safely unlock here to avoid it.
  55                  */
  56                 vhost_user_iotlb_rd_unlock(vq);
  57
  58                 vhost_user_iotlb_pending_insert(vq, iova, perm);
  59                 if (vhost_user_iotlb_miss(dev, iova, perm)) {
  60                         VHOST_LOG_CONFIG(ERR,
  61                                 "IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
  62                                 iova);
  63                         vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
  64                 }
  65
  66                 vhost_user_iotlb_rd_lock(vq);
  67         }
  68
  69         return 0;
  70 }
  71
  72 #define VHOST_LOG_PAGE  4096
  73
  74 /*
  75  * Atomically set a bit in memory.
  76  */
  77 static __rte_always_inline void
  78 vhost_set_bit(unsigned int nr, volatile uint8_t *addr)
  79 {
  80 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
  81         /*
  82          * __sync_ built-ins are deprecated, but __atomic_ ones
  83          * are sub-optimized in older GCC versions.
  84          */
  85         __sync_fetch_and_or_1(addr, (1U << nr));
  86 #else
  87         __atomic_fetch_or(addr, (1U << nr), __ATOMIC_RELAXED);
  88 #endif
  89 }
  90
  91 static __rte_always_inline void
  92 vhost_log_page(uint8_t *log_base, uint64_t page)
  93 {
  94         vhost_set_bit(page % 8, &log_base[page / 8]);
  95 }
  96
  97 void
  98 __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
  99 {
 100         uint64_t page;
 101
 102         if (unlikely(!dev->log_base || !len))
 103                 return;
 104
 105         if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
 106                 return;
 107
 108         /* To make sure guest memory updates are committed before logging */
 109         rte_smp_wmb();
 110
 111         page = addr / VHOST_LOG_PAGE;
 112         while (page * VHOST_LOG_PAGE < addr + len) {
 113                 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
 114                 page += 1;
 115         }
 116 }
 117
 118 void
 119 __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
 120                              uint64_t iova, uint64_t len)
 121 {
 122         uint64_t hva, gpa, map_len;
 123         map_len = len;
 124
 125         hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
 126         if (map_len != len) {
 127                 VHOST_LOG_DATA(ERR,
 128                         "Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
 129                         iova);
 130                 return;
 131         }
 132
 133         gpa = hva_to_gpa(dev, hva, len);
 134         if (gpa)
 135                 __vhost_log_write(dev, gpa, len);
 136 }
 137
 138 void
 139 __vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
 140 {
 141         unsigned long *log_base;
 142         int i;
 143
 144         if (unlikely(!dev->log_base))
 145                 return;
 146
 147         rte_smp_wmb();
 148
 149         log_base = (unsigned long *)(uintptr_t)dev->log_base;
 150
 151         for (i = 0; i < vq->log_cache_nb_elem; i++) {
 152                 struct log_cache_entry *elem = vq->log_cache + i;
 153
 154 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
 155                 /*
 156                  * '__sync' builtins are deprecated, but '__atomic' ones
 157                  * are sub-optimized in older GCC versions.
 158                  */
 159                 __sync_fetch_and_or(log_base + elem->offset, elem->val);
 160 #else
 161                 __atomic_fetch_or(log_base + elem->offset, elem->val,
 162                                 __ATOMIC_RELAXED);
 163 #endif
 164         }
 165
 166         rte_smp_wmb();
 167
 168         vq->log_cache_nb_elem = 0;
 169 }
 170
 171 static __rte_always_inline void
 172 vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq,
 173                         uint64_t page)
 174 {
 175         uint32_t bit_nr = page % (sizeof(unsigned long) << 3);
 176         uint32_t offset = page / (sizeof(unsigned long) << 3);
 177         int i;
 178
 179         for (i = 0; i < vq->log_cache_nb_elem; i++) {
 180                 struct log_cache_entry *elem = vq->log_cache + i;
 181
 182                 if (elem->offset == offset) {
 183                         elem->val |= (1UL << bit_nr);
 184                         return;
 185                 }
 186         }
 187
 188         if (unlikely(i >= VHOST_LOG_CACHE_NR)) {
 189                 /*
 190                  * No more room for a new log cache entry,
 191                  * so write the dirty log map directly.
 192                  */
 193                 rte_smp_wmb();
 194                 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
 195
 196                 return;
 197         }
 198
 199         vq->log_cache[i].offset = offset;
 200         vq->log_cache[i].val = (1UL << bit_nr);
 201         vq->log_cache_nb_elem++;
 202 }
 203
 204 void
 205 __vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
 206                         uint64_t addr, uint64_t len)
 207 {
 208         uint64_t page;
 209
 210         if (unlikely(!dev->log_base || !len))
 211                 return;
 212
 213         if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
 214                 return;
 215
 216         page = addr / VHOST_LOG_PAGE;
 217         while (page * VHOST_LOG_PAGE < addr + len) {
 218                 vhost_log_cache_page(dev, vq, page);
 219                 page += 1;
 220         }
 221 }
 222
 223 void
 224 __vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
 225                              uint64_t iova, uint64_t len)
 226 {
 227         uint64_t hva, gpa, map_len;
 228         map_len = len;
 229
 230         hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
 231         if (map_len != len) {
 232                 VHOST_LOG_DATA(ERR,
 233                         "Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
 234                         iova);
 235                 return;
 236         }
 237
 238         gpa = hva_to_gpa(dev, hva, len);
 239         if (gpa)
 240                 __vhost_log_cache_write(dev, vq, gpa, len);
 241 }
 242
 243 void *
 244 vhost_alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
 245                 uint64_t desc_addr, uint64_t desc_len)
 246 {
 247         void *idesc;
 248         uint64_t src, dst;
 249         uint64_t len, remain = desc_len;
 250
 251         idesc = rte_malloc(__func__, desc_len, 0);
 252         if (unlikely(!idesc))
 253                 return NULL;
 254
 255         dst = (uint64_t)(uintptr_t)idesc;
 256
 257         while (remain) {
 258                 len = remain;
 259                 src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
 260                                 VHOST_ACCESS_RO);
 261                 if (unlikely(!src || !len)) {
 262                         rte_free(idesc);
 263                         return NULL;
 264                 }
 265
 266                 rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
 267
 268                 remain -= len;
 269                 dst += len;
 270                 desc_addr += len;
 271         }
 272
 273         return idesc;
 274 }
 275
 276 void
 277 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
 278 {
 279         if ((vq->callfd >= 0) && (destroy != 0))
 280                 close(vq->callfd);
 281         if (vq->kickfd >= 0)
 282                 close(vq->kickfd);
 283 }
 284
 285 void
 286 cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq)
 287 {
 288         if (!(dev->protocol_features &
 289             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
 290                 return;
 291
 292         if (vq_is_packed(dev)) {
 293                 if (vq->inflight_packed)
 294                         vq->inflight_packed = NULL;
 295         } else {
 296                 if (vq->inflight_split)
 297                         vq->inflight_split = NULL;
 298         }
 299
 300         if (vq->resubmit_inflight) {
 301                 if (vq->resubmit_inflight->resubmit_list) {
 302                         free(vq->resubmit_inflight->resubmit_list);
 303                         vq->resubmit_inflight->resubmit_list = NULL;
 304                 }
 305                 free(vq->resubmit_inflight);
 306                 vq->resubmit_inflight = NULL;
 307         }
 308 }
 309
 310 /*
 311  * Unmap any memory, close any file descriptors and
 312  * free any memory owned by a device.
 313  */
 314 void
 315 cleanup_device(struct virtio_net *dev, int destroy)
 316 {
 317         uint32_t i;
 318
 319         vhost_backend_cleanup(dev);
 320
 321         for (i = 0; i < dev->nr_vring; i++) {
 322                 cleanup_vq(dev->virtqueue[i], destroy);
 323                 cleanup_vq_inflight(dev, dev->virtqueue[i]);
 324         }
 325 }
 326
 327 void
 328 free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq)
 329 {
 330         if (vq_is_packed(dev))
 331                 rte_free(vq->shadow_used_packed);
 332         else
 333                 rte_free(vq->shadow_used_split);
 334         rte_free(vq->batch_copy_elems);
 335         rte_mempool_free(vq->iotlb_pool);
 336         rte_free(vq);
 337 }
 338
 339 /*
 340  * Release virtqueues and device memory.
 341  */
 342 static void
 343 free_device(struct virtio_net *dev)
 344 {
 345         uint32_t i;
 346
 347         for (i = 0; i < dev->nr_vring; i++)
 348                 free_vq(dev, dev->virtqueue[i]);
 349
 350         rte_free(dev);
 351 }
 352
 353 static __rte_always_inline int
 354 log_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 355 {
 356         if (likely(!(vq->ring_addrs.flags & (1 << VHOST_VRING_F_LOG))))
 357                 return 0;
 358
 359         vq->log_guest_addr = translate_log_addr(dev, vq,
 360                                                 vq->ring_addrs.log_guest_addr);
 361         if (vq->log_guest_addr == 0)
 362                 return -1;
 363
 364         return 0;
 365 }
 366
 367 /*
 368  * Converts vring log address to GPA
 369  * If IOMMU is enabled, the log address is IOVA
 370  * If IOMMU not enabled, the log address is already GPA
 371  *
 372  * Caller should have iotlb_lock read-locked
 373  */
 374 uint64_t
 375 translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
 376                 uint64_t log_addr)
 377 {
 378         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 379                 const uint64_t exp_size = sizeof(uint64_t);
 380                 uint64_t hva, gpa;
 381                 uint64_t size = exp_size;
 382
 383                 hva = vhost_iova_to_vva(dev, vq, log_addr,
 384                                         &size, VHOST_ACCESS_RW);
 385
 386                 if (size != exp_size)
 387                         return 0;
 388
 389                 gpa = hva_to_gpa(dev, hva, exp_size);
 390                 if (!gpa) {
 391                         VHOST_LOG_CONFIG(ERR,
 392                                 "VQ: Failed to find GPA for log_addr: 0x%"
 393                                 PRIx64 " hva: 0x%" PRIx64 "\n",
 394                                 log_addr, hva);
 395                         return 0;
 396                 }
 397                 return gpa;
 398
 399         } else
 400                 return log_addr;
 401 }
 402
 403 /* Caller should have iotlb_lock read-locked */
 404 static int
 405 vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
 406 {
 407         uint64_t req_size, size;
 408
 409         req_size = sizeof(struct vring_desc) * vq->size;
 410         size = req_size;
 411         vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 412                                                 vq->ring_addrs.desc_user_addr,
 413                                                 &size, VHOST_ACCESS_RW);
 414         if (!vq->desc || size != req_size)
 415                 return -1;
 416
 417         req_size = sizeof(struct vring_avail);
 418         req_size += sizeof(uint16_t) * vq->size;
 419         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 420                 req_size += sizeof(uint16_t);
 421         size = req_size;
 422         vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 423                                                 vq->ring_addrs.avail_user_addr,
 424                                                 &size, VHOST_ACCESS_RW);
 425         if (!vq->avail || size != req_size)
 426                 return -1;
 427
 428         req_size = sizeof(struct vring_used);
 429         req_size += sizeof(struct vring_used_elem) * vq->size;
 430         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 431                 req_size += sizeof(uint16_t);
 432         size = req_size;
 433         vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 434                                                 vq->ring_addrs.used_user_addr,
 435                                                 &size, VHOST_ACCESS_RW);
 436         if (!vq->used || size != req_size)
 437                 return -1;
 438
 439         return 0;
 440 }
 441
 442 /* Caller should have iotlb_lock read-locked */
 443 static int
 444 vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
 445 {
 446         uint64_t req_size, size;
 447
 448         req_size = sizeof(struct vring_packed_desc) * vq->size;
 449         size = req_size;
 450         vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 451                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.desc_user_addr,
 452                                 &size, VHOST_ACCESS_RW);
 453         if (!vq->desc_packed || size != req_size)
 454                 return -1;
 455
 456         req_size = sizeof(struct vring_packed_desc_event);
 457         size = req_size;
 458         vq->driver_event = (struct vring_packed_desc_event *)(uintptr_t)
 459                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.avail_user_addr,
 460                                 &size, VHOST_ACCESS_RW);
 461         if (!vq->driver_event || size != req_size)
 462                 return -1;
 463
 464         req_size = sizeof(struct vring_packed_desc_event);
 465         size = req_size;
 466         vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
 467                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.used_user_addr,
 468                                 &size, VHOST_ACCESS_RW);
 469         if (!vq->device_event || size != req_size)
 470                 return -1;
 471
 472         return 0;
 473 }
 474
 475 int
 476 vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 477 {
 478
 479         if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
 480                 return -1;
 481
 482         if (vq_is_packed(dev)) {
 483                 if (vring_translate_packed(dev, vq) < 0)
 484                         return -1;
 485         } else {
 486                 if (vring_translate_split(dev, vq) < 0)
 487                         return -1;
 488         }
 489
 490         if (log_translate(dev, vq) < 0)
 491                 return -1;
 492
 493         vq->access_ok = 1;
 494
 495         return 0;
 496 }
 497
 498 void
 499 vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 500 {
 501         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 502                 vhost_user_iotlb_wr_lock(vq);
 503
 504         vq->access_ok = 0;
 505         vq->desc = NULL;
 506         vq->avail = NULL;
 507         vq->used = NULL;
 508         vq->log_guest_addr = 0;
 509
 510         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 511                 vhost_user_iotlb_wr_unlock(vq);
 512 }
 513
 514 static void
 515 init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 516 {
 517         struct vhost_virtqueue *vq;
 518
 519         if (vring_idx >= VHOST_MAX_VRING) {
 520                 VHOST_LOG_CONFIG(ERR,
 521                                 "Failed not init vring, out of bound (%d)\n",
 522                                 vring_idx);
 523                 return;
 524         }
 525
 526         vq = dev->virtqueue[vring_idx];
 527
 528         memset(vq, 0, sizeof(struct vhost_virtqueue));
 529
 530         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 531         vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
 532
 533         vhost_user_iotlb_init(dev, vring_idx);
 534         /* Backends are set to -1 indicating an inactive device. */
 535         vq->backend = -1;
 536
 537         TAILQ_INIT(&vq->zmbuf_list);
 538 }
 539
 540 static void
 541 reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 542 {
 543         struct vhost_virtqueue *vq;
 544         int callfd;
 545
 546         if (vring_idx >= VHOST_MAX_VRING) {
 547                 VHOST_LOG_CONFIG(ERR,
 548                                 "Failed not init vring, out of bound (%d)\n",
 549                                 vring_idx);
 550                 return;
 551         }
 552
 553         vq = dev->virtqueue[vring_idx];
 554         callfd = vq->callfd;
 555         init_vring_queue(dev, vring_idx);
 556         vq->callfd = callfd;
 557 }
 558
 559 int
 560 alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 561 {
 562         struct vhost_virtqueue *vq;
 563
 564         vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
 565         if (vq == NULL) {
 566                 VHOST_LOG_CONFIG(ERR,
 567                         "Failed to allocate memory for vring:%u.\n", vring_idx);
 568                 return -1;
 569         }
 570
 571         dev->virtqueue[vring_idx] = vq;
 572         init_vring_queue(dev, vring_idx);
 573         rte_spinlock_init(&vq->access_lock);
 574         vq->avail_wrap_counter = 1;
 575         vq->used_wrap_counter = 1;
 576         vq->signalled_used_valid = false;
 577
 578         dev->nr_vring += 1;
 579
 580         return 0;
 581 }
 582
 583 /*
 584  * Reset some variables in device structure, while keeping few
 585  * others untouched, such as vid, ifname, nr_vring: they
 586  * should be same unless the device is removed.
 587  */
 588 void
 589 reset_device(struct virtio_net *dev)
 590 {
 591         uint32_t i;
 592
 593         dev->features = 0;
 594         dev->protocol_features = 0;
 595         dev->flags &= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 596
 597         for (i = 0; i < dev->nr_vring; i++)
 598                 reset_vring_queue(dev, i);
 599 }
 600
 601 /*
 602  * Invoked when there is a new vhost-user connection established (when
 603  * there is a new virtio device being attached).
 604  */
 605 int
 606 vhost_new_device(void)
 607 {
 608         struct virtio_net *dev;
 609         int i;
 610
 611         for (i = 0; i < MAX_VHOST_DEVICE; i++) {
 612                 if (vhost_devices[i] == NULL)
 613                         break;
 614         }
 615
 616         if (i == MAX_VHOST_DEVICE) {
 617                 VHOST_LOG_CONFIG(ERR,
 618                         "Failed to find a free slot for new device.\n");
 619                 return -1;
 620         }
 621
 622         dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
 623         if (dev == NULL) {
 624                 VHOST_LOG_CONFIG(ERR,
 625                         "Failed to allocate memory for new dev.\n");
 626                 return -1;
 627         }
 628
 629         vhost_devices[i] = dev;
 630         dev->vid = i;
 631         dev->flags = VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 632         dev->slave_req_fd = -1;
 633         dev->postcopy_ufd = -1;
 634         rte_spinlock_init(&dev->slave_req_lock);
 635
 636         return i;
 637 }
 638
 639 void
 640 vhost_destroy_device_notify(struct virtio_net *dev)
 641 {
 642         struct rte_vdpa_device *vdpa_dev;
 643
 644         if (dev->flags & VIRTIO_DEV_RUNNING) {
 645                 vdpa_dev = dev->vdpa_dev;
 646                 if (vdpa_dev && vdpa_dev->ops->dev_close)
 647                         vdpa_dev->ops->dev_close(dev->vid);
 648                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 649                 dev->notify_ops->destroy_device(dev->vid);
 650         }
 651 }
 652
 653 /*
 654  * Invoked when there is the vhost-user connection is broken (when
 655  * the virtio device is being detached).
 656  */
 657 void
 658 vhost_destroy_device(int vid)
 659 {
 660         struct virtio_net *dev = get_device(vid);
 661
 662         if (dev == NULL)
 663                 return;
 664
 665         vhost_destroy_device_notify(dev);
 666
 667         cleanup_device(dev, 1);
 668         free_device(dev);
 669
 670         vhost_devices[vid] = NULL;
 671 }
 672
 673 void
 674 vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *vdpa_dev)
 675 {
 676         struct virtio_net *dev = get_device(vid);
 677
 678         if (dev == NULL)
 679                 return;
 680
 681         dev->vdpa_dev = vdpa_dev;
 682 }
 683
 684 void
 685 vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
 686 {
 687         struct virtio_net *dev;
 688         unsigned int len;
 689
 690         dev = get_device(vid);
 691         if (dev == NULL)
 692                 return;
 693
 694         len = if_len > sizeof(dev->ifname) ?
 695                 sizeof(dev->ifname) : if_len;
 696
 697         strncpy(dev->ifname, if_name, len);
 698         dev->ifname[sizeof(dev->ifname) - 1] = '\0';
 699 }
 700
 701 void
 702 vhost_enable_dequeue_zero_copy(int vid)
 703 {
 704         struct virtio_net *dev = get_device(vid);
 705
 706         if (dev == NULL)
 707                 return;
 708
 709         dev->dequeue_zero_copy = 1;
 710 }
 711
 712 void
 713 vhost_set_builtin_virtio_net(int vid, bool enable)
 714 {
 715         struct virtio_net *dev = get_device(vid);
 716
 717         if (dev == NULL)
 718                 return;
 719
 720         if (enable)
 721                 dev->flags |= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 722         else
 723                 dev->flags &= ~VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 724 }
 725
 726 void
 727 vhost_enable_extbuf(int vid)
 728 {
 729         struct virtio_net *dev = get_device(vid);
 730
 731         if (dev == NULL)
 732                 return;
 733
 734         dev->extbuf = 1;
 735 }
 736
 737 void
 738 vhost_enable_linearbuf(int vid)
 739 {
 740         struct virtio_net *dev = get_device(vid);
 741
 742         if (dev == NULL)
 743                 return;
 744
 745         dev->linearbuf = 1;
 746 }
 747
 748 int
 749 rte_vhost_get_mtu(int vid, uint16_t *mtu)
 750 {
 751         struct virtio_net *dev = get_device(vid);
 752
 753         if (dev == NULL || mtu == NULL)
 754                 return -ENODEV;
 755
 756         if (!(dev->flags & VIRTIO_DEV_READY))
 757                 return -EAGAIN;
 758
 759         if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
 760                 return -ENOTSUP;
 761
 762         *mtu = dev->mtu;
 763
 764         return 0;
 765 }
 766
 767 int
 768 rte_vhost_get_numa_node(int vid)
 769 {
 770 #ifdef RTE_LIBRTE_VHOST_NUMA
 771         struct virtio_net *dev = get_device(vid);
 772         int numa_node;
 773         int ret;
 774
 775         if (dev == NULL || numa_available() != 0)
 776                 return -1;
 777
 778         ret = get_mempolicy(&numa_node, NULL, 0, dev,
 779                             MPOL_F_NODE | MPOL_F_ADDR);
 780         if (ret < 0) {
 781                 VHOST_LOG_CONFIG(ERR,
 782                         "(%d) failed to query numa node: %s\n",
 783                         vid, rte_strerror(errno));
 784                 return -1;
 785         }
 786
 787         return numa_node;
 788 #else
 789         RTE_SET_USED(vid);
 790         return -1;
 791 #endif
 792 }
 793
 794 uint32_t
 795 rte_vhost_get_queue_num(int vid)
 796 {
 797         struct virtio_net *dev = get_device(vid);
 798
 799         if (dev == NULL)
 800                 return 0;
 801
 802         return dev->nr_vring / 2;
 803 }
 804
 805 uint16_t
 806 rte_vhost_get_vring_num(int vid)
 807 {
 808         struct virtio_net *dev = get_device(vid);
 809
 810         if (dev == NULL)
 811                 return 0;
 812
 813         return dev->nr_vring;
 814 }
 815
 816 int
 817 rte_vhost_get_ifname(int vid, char *buf, size_t len)
 818 {
 819         struct virtio_net *dev = get_device(vid);
 820
 821         if (dev == NULL || buf == NULL)
 822                 return -1;
 823
 824         len = RTE_MIN(len, sizeof(dev->ifname));
 825
 826         strncpy(buf, dev->ifname, len);
 827         buf[len - 1] = '\0';
 828
 829         return 0;
 830 }
 831
 832 int
 833 rte_vhost_get_negotiated_features(int vid, uint64_t *features)
 834 {
 835         struct virtio_net *dev;
 836
 837         dev = get_device(vid);
 838         if (dev == NULL || features == NULL)
 839                 return -1;
 840
 841         *features = dev->features;
 842         return 0;
 843 }
 844
 845 int
 846 rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
 847 {
 848         struct virtio_net *dev;
 849         struct rte_vhost_memory *m;
 850         size_t size;
 851
 852         dev = get_device(vid);
 853         if (dev == NULL || mem == NULL)
 854                 return -1;
 855
 856         size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
 857         m = malloc(sizeof(struct rte_vhost_memory) + size);
 858         if (!m)
 859                 return -1;
 860
 861         m->nregions = dev->mem->nregions;
 862         memcpy(m->regions, dev->mem->regions, size);
 863         *mem = m;
 864
 865         return 0;
 866 }
 867
 868 int
 869 rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
 870                           struct rte_vhost_vring *vring)
 871 {
 872         struct virtio_net *dev;
 873         struct vhost_virtqueue *vq;
 874
 875         dev = get_device(vid);
 876         if (dev == NULL || vring == NULL)
 877                 return -1;
 878
 879         if (vring_idx >= VHOST_MAX_VRING)
 880                 return -1;
 881
 882         vq = dev->virtqueue[vring_idx];
 883         if (!vq)
 884                 return -1;
 885
 886         if (vq_is_packed(dev)) {
 887                 vring->desc_packed = vq->desc_packed;
 888                 vring->driver_event = vq->driver_event;
 889                 vring->device_event = vq->device_event;
 890         } else {
 891                 vring->desc = vq->desc;
 892                 vring->avail = vq->avail;
 893                 vring->used = vq->used;
 894         }
 895         vring->log_guest_addr  = vq->log_guest_addr;
 896
 897         vring->callfd  = vq->callfd;
 898         vring->kickfd  = vq->kickfd;
 899         vring->size    = vq->size;
 900
 901         return 0;
 902 }
 903
 904 int
 905 rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
 906                                   struct rte_vhost_ring_inflight *vring)
 907 {
 908         struct virtio_net *dev;
 909         struct vhost_virtqueue *vq;
 910
 911         dev = get_device(vid);
 912         if (unlikely(!dev))
 913                 return -1;
 914
 915         if (vring_idx >= VHOST_MAX_VRING)
 916                 return -1;
 917
 918         vq = dev->virtqueue[vring_idx];
 919         if (unlikely(!vq))
 920                 return -1;
 921
 922         if (vq_is_packed(dev)) {
 923                 if (unlikely(!vq->inflight_packed))
 924                         return -1;
 925
 926                 vring->inflight_packed = vq->inflight_packed;
 927         } else {
 928                 if (unlikely(!vq->inflight_split))
 929                         return -1;
 930
 931                 vring->inflight_split = vq->inflight_split;
 932         }
 933
 934         vring->resubmit_inflight = vq->resubmit_inflight;
 935
 936         return 0;
 937 }
 938
 939 int
 940 rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
 941                                   uint16_t idx)
 942 {
 943         struct vhost_virtqueue *vq;
 944         struct virtio_net *dev;
 945
 946         dev = get_device(vid);
 947         if (unlikely(!dev))
 948                 return -1;
 949
 950         if (unlikely(!(dev->protocol_features &
 951             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
 952                 return 0;
 953
 954         if (unlikely(vq_is_packed(dev)))
 955                 return -1;
 956
 957         if (unlikely(vring_idx >= VHOST_MAX_VRING))
 958                 return -1;
 959
 960         vq = dev->virtqueue[vring_idx];
 961         if (unlikely(!vq))
 962                 return -1;
 963
 964         if (unlikely(!vq->inflight_split))
 965                 return -1;
 966
 967         if (unlikely(idx >= vq->size))
 968                 return -1;
 969
 970         vq->inflight_split->desc[idx].counter = vq->global_counter++;
 971         vq->inflight_split->desc[idx].inflight = 1;
 972         return 0;
 973 }
 974
 975 int
 976 rte_vhost_set_inflight_desc_packed(int vid, uint16_t vring_idx,
 977                                    uint16_t head, uint16_t last,
 978                                    uint16_t *inflight_entry)
 979 {
 980         struct rte_vhost_inflight_info_packed *inflight_info;
 981         struct virtio_net *dev;
 982         struct vhost_virtqueue *vq;
 983         struct vring_packed_desc *desc;
 984         uint16_t old_free_head, free_head;
 985
 986         dev = get_device(vid);
 987         if (unlikely(!dev))
 988                 return -1;
 989
 990         if (unlikely(!(dev->protocol_features &
 991             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
 992                 return 0;
 993
 994         if (unlikely(!vq_is_packed(dev)))
 995                 return -1;
 996
 997         if (unlikely(vring_idx >= VHOST_MAX_VRING))
 998                 return -1;
 999
1000         vq = dev->virtqueue[vring_idx];
1001         if (unlikely(!vq))
1002                 return -1;
1003
1004         inflight_info = vq->inflight_packed;
1005         if (unlikely(!inflight_info))
1006                 return -1;
1007
1008         if (unlikely(head >= vq->size))
1009                 return -1;
1010
1011         desc = vq->desc_packed;
1012         old_free_head = inflight_info->old_free_head;
1013         if (unlikely(old_free_head >= vq->size))
1014                 return -1;
1015
1016         free_head = old_free_head;
1017
1018         /* init header descriptor */
1019         inflight_info->desc[old_free_head].num = 0;
1020         inflight_info->desc[old_free_head].counter = vq->global_counter++;
1021         inflight_info->desc[old_free_head].inflight = 1;
1022
1023         /* save desc entry in flight entry */
1024         while (head != ((last + 1) % vq->size)) {
1025                 inflight_info->desc[old_free_head].num++;
1026                 inflight_info->desc[free_head].addr = desc[head].addr;
1027                 inflight_info->desc[free_head].len = desc[head].len;
1028                 inflight_info->desc[free_head].flags = desc[head].flags;
1029                 inflight_info->desc[free_head].id = desc[head].id;
1030
1031                 inflight_info->desc[old_free_head].last = free_head;
1032                 free_head = inflight_info->desc[free_head].next;
1033                 inflight_info->free_head = free_head;
1034                 head = (head + 1) % vq->size;
1035         }
1036
1037         inflight_info->old_free_head = free_head;
1038         *inflight_entry = old_free_head;
1039
1040         return 0;
1041 }
1042
1043 int
1044 rte_vhost_clr_inflight_desc_split(int vid, uint16_t vring_idx,
1045                                   uint16_t last_used_idx, uint16_t idx)
1046 {
1047         struct virtio_net *dev;
1048         struct vhost_virtqueue *vq;
1049
1050         dev = get_device(vid);
1051         if (unlikely(!dev))
1052                 return -1;
1053
1054         if (unlikely(!(dev->protocol_features &
1055             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1056                 return 0;
1057
1058         if (unlikely(vq_is_packed(dev)))
1059                 return -1;
1060
1061         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1062                 return -1;
1063
1064         vq = dev->virtqueue[vring_idx];
1065         if (unlikely(!vq))
1066                 return -1;
1067
1068         if (unlikely(!vq->inflight_split))
1069                 return -1;
1070
1071         if (unlikely(idx >= vq->size))
1072                 return -1;
1073
1074         rte_smp_mb();
1075
1076         vq->inflight_split->desc[idx].inflight = 0;
1077
1078         rte_smp_mb();
1079
1080         vq->inflight_split->used_idx = last_used_idx;
1081         return 0;
1082 }
1083
1084 int
1085 rte_vhost_clr_inflight_desc_packed(int vid, uint16_t vring_idx,
1086                                    uint16_t head)
1087 {
1088         struct rte_vhost_inflight_info_packed *inflight_info;
1089         struct virtio_net *dev;
1090         struct vhost_virtqueue *vq;
1091
1092         dev = get_device(vid);
1093         if (unlikely(!dev))
1094                 return -1;
1095
1096         if (unlikely(!(dev->protocol_features &
1097             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1098                 return 0;
1099
1100         if (unlikely(!vq_is_packed(dev)))
1101                 return -1;
1102
1103         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1104                 return -1;
1105
1106         vq = dev->virtqueue[vring_idx];
1107         if (unlikely(!vq))
1108                 return -1;
1109
1110         inflight_info = vq->inflight_packed;
1111         if (unlikely(!inflight_info))
1112                 return -1;
1113
1114         if (unlikely(head >= vq->size))
1115                 return -1;
1116
1117         rte_smp_mb();
1118
1119         inflight_info->desc[head].inflight = 0;
1120
1121         rte_smp_mb();
1122
1123         inflight_info->old_free_head = inflight_info->free_head;
1124         inflight_info->old_used_idx = inflight_info->used_idx;
1125         inflight_info->old_used_wrap_counter = inflight_info->used_wrap_counter;
1126
1127         return 0;
1128 }
1129
1130 int
1131 rte_vhost_set_last_inflight_io_split(int vid, uint16_t vring_idx,
1132                                      uint16_t idx)
1133 {
1134         struct virtio_net *dev;
1135         struct vhost_virtqueue *vq;
1136
1137         dev = get_device(vid);
1138         if (unlikely(!dev))
1139                 return -1;
1140
1141         if (unlikely(!(dev->protocol_features &
1142             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1143                 return 0;
1144
1145         if (unlikely(vq_is_packed(dev)))
1146                 return -1;
1147
1148         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1149                 return -1;
1150
1151         vq = dev->virtqueue[vring_idx];
1152         if (unlikely(!vq))
1153                 return -1;
1154
1155         if (unlikely(!vq->inflight_split))
1156                 return -1;
1157
1158         vq->inflight_split->last_inflight_io = idx;
1159         return 0;
1160 }
1161
1162 int
1163 rte_vhost_set_last_inflight_io_packed(int vid, uint16_t vring_idx,
1164                                       uint16_t head)
1165 {
1166         struct rte_vhost_inflight_info_packed *inflight_info;
1167         struct virtio_net *dev;
1168         struct vhost_virtqueue *vq;
1169         uint16_t last;
1170
1171         dev = get_device(vid);
1172         if (unlikely(!dev))
1173                 return -1;
1174
1175         if (unlikely(!(dev->protocol_features &
1176             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1177                 return 0;
1178
1179         if (unlikely(!vq_is_packed(dev)))
1180                 return -1;
1181
1182         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1183                 return -1;
1184
1185         vq = dev->virtqueue[vring_idx];
1186         if (unlikely(!vq))
1187                 return -1;
1188
1189         inflight_info = vq->inflight_packed;
1190         if (unlikely(!inflight_info))
1191                 return -1;
1192
1193         if (unlikely(head >= vq->size))
1194                 return -1;
1195
1196         last = inflight_info->desc[head].last;
1197         if (unlikely(last >= vq->size))
1198                 return -1;
1199
1200         inflight_info->desc[last].next = inflight_info->free_head;
1201         inflight_info->free_head = head;
1202         inflight_info->used_idx += inflight_info->desc[head].num;
1203         if (inflight_info->used_idx >= inflight_info->desc_num) {
1204                 inflight_info->used_idx -= inflight_info->desc_num;
1205                 inflight_info->used_wrap_counter =
1206                         !inflight_info->used_wrap_counter;
1207         }
1208
1209         return 0;
1210 }
1211
1212 int
1213 rte_vhost_vring_call(int vid, uint16_t vring_idx)
1214 {
1215         struct virtio_net *dev;
1216         struct vhost_virtqueue *vq;
1217
1218         dev = get_device(vid);
1219         if (!dev)
1220                 return -1;
1221
1222         if (vring_idx >= VHOST_MAX_VRING)
1223                 return -1;
1224
1225         vq = dev->virtqueue[vring_idx];
1226         if (!vq)
1227                 return -1;
1228
1229         if (vq_is_packed(dev))
1230                 vhost_vring_call_packed(dev, vq);
1231         else
1232                 vhost_vring_call_split(dev, vq);
1233
1234         return 0;
1235 }
1236
1237 uint16_t
1238 rte_vhost_avail_entries(int vid, uint16_t queue_id)
1239 {
1240         struct virtio_net *dev;
1241         struct vhost_virtqueue *vq;
1242         uint16_t ret = 0;
1243
1244         dev = get_device(vid);
1245         if (!dev)
1246                 return 0;
1247
1248         vq = dev->virtqueue[queue_id];
1249
1250         rte_spinlock_lock(&vq->access_lock);
1251
1252         if (unlikely(!vq->enabled || vq->avail == NULL))
1253                 goto out;
1254
1255         ret = *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
1256
1257 out:
1258         rte_spinlock_unlock(&vq->access_lock);
1259         return ret;
1260 }
1261
1262 static inline int
1263 vhost_enable_notify_split(struct virtio_net *dev,
1264                 struct vhost_virtqueue *vq, int enable)
1265 {
1266         if (vq->used == NULL)
1267                 return -1;
1268
1269         if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
1270                 if (enable)
1271                         vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
1272                 else
1273                         vq->used->flags |= VRING_USED_F_NO_NOTIFY;
1274         } else {
1275                 if (enable)
1276                         vhost_avail_event(vq) = vq->last_avail_idx;
1277         }
1278         return 0;
1279 }
1280
1281 static inline int
1282 vhost_enable_notify_packed(struct virtio_net *dev,
1283                 struct vhost_virtqueue *vq, int enable)
1284 {
1285         uint16_t flags;
1286
1287         if (vq->device_event == NULL)
1288                 return -1;
1289
1290         if (!enable) {
1291                 vq->device_event->flags = VRING_EVENT_F_DISABLE;
1292                 return 0;
1293         }
1294
1295         flags = VRING_EVENT_F_ENABLE;
1296         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
1297                 flags = VRING_EVENT_F_DESC;
1298                 vq->device_event->off_wrap = vq->last_avail_idx |
1299                         vq->avail_wrap_counter << 15;
1300         }
1301
1302         rte_smp_wmb();
1303
1304         vq->device_event->flags = flags;
1305         return 0;
1306 }
1307
1308 int
1309 rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
1310 {
1311         struct virtio_net *dev = get_device(vid);
1312         struct vhost_virtqueue *vq;
1313         int ret;
1314
1315         if (!dev)
1316                 return -1;
1317
1318         vq = dev->virtqueue[queue_id];
1319
1320         rte_spinlock_lock(&vq->access_lock);
1321
1322         if (vq_is_packed(dev))
1323                 ret = vhost_enable_notify_packed(dev, vq, enable);
1324         else
1325                 ret = vhost_enable_notify_split(dev, vq, enable);
1326
1327         rte_spinlock_unlock(&vq->access_lock);
1328
1329         return ret;
1330 }
1331
1332 void
1333 rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
1334 {
1335         struct virtio_net *dev = get_device(vid);
1336
1337         if (dev == NULL)
1338                 return;
1339
1340         vhost_log_write(dev, addr, len);
1341 }
1342
1343 void
1344 rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
1345                          uint64_t offset, uint64_t len)
1346 {
1347         struct virtio_net *dev;
1348         struct vhost_virtqueue *vq;
1349
1350         dev = get_device(vid);
1351         if (dev == NULL)
1352                 return;
1353
1354         if (vring_idx >= VHOST_MAX_VRING)
1355                 return;
1356         vq = dev->virtqueue[vring_idx];
1357         if (!vq)
1358                 return;
1359
1360         vhost_log_used_vring(dev, vq, offset, len);
1361 }
1362
1363 uint32_t
1364 rte_vhost_rx_queue_count(int vid, uint16_t qid)
1365 {
1366         struct virtio_net *dev;
1367         struct vhost_virtqueue *vq;
1368         uint32_t ret = 0;
1369
1370         dev = get_device(vid);
1371         if (dev == NULL)
1372                 return 0;
1373
1374         if (unlikely(qid >= dev->nr_vring || (qid & 1) == 0)) {
1375                 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1376                         dev->vid, __func__, qid);
1377                 return 0;
1378         }
1379
1380         vq = dev->virtqueue[qid];
1381         if (vq == NULL)
1382                 return 0;
1383
1384         rte_spinlock_lock(&vq->access_lock);
1385
1386         if (unlikely(vq->enabled == 0 || vq->avail == NULL))
1387                 goto out;
1388
1389         ret = *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx;
1390
1391 out:
1392         rte_spinlock_unlock(&vq->access_lock);
1393         return ret;
1394 }
1395
1396 struct rte_vdpa_device *
1397 rte_vhost_get_vdpa_device(int vid)
1398 {
1399         struct virtio_net *dev = get_device(vid);
1400
1401         if (dev == NULL)
1402                 return NULL;
1403
1404         return dev->vdpa_dev;
1405 }
1406
1407 int rte_vhost_get_log_base(int vid, uint64_t *log_base,
1408                 uint64_t *log_size)
1409 {
1410         struct virtio_net *dev = get_device(vid);
1411
1412         if (dev == NULL || log_base == NULL || log_size == NULL)
1413                 return -1;
1414
1415         *log_base = dev->log_base;
1416         *log_size = dev->log_size;
1417
1418         return 0;
1419 }
1420
1421 int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
1422                 uint16_t *last_avail_idx, uint16_t *last_used_idx)
1423 {
1424         struct vhost_virtqueue *vq;
1425         struct virtio_net *dev = get_device(vid);
1426
1427         if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1428                 return -1;
1429
1430         vq = dev->virtqueue[queue_id];
1431         if (!vq)
1432                 return -1;
1433
1434         if (vq_is_packed(dev)) {
1435                 *last_avail_idx = (vq->avail_wrap_counter << 15) |
1436                                   vq->last_avail_idx;
1437                 *last_used_idx = (vq->used_wrap_counter << 15) |
1438                                  vq->last_used_idx;
1439         } else {
1440                 *last_avail_idx = vq->last_avail_idx;
1441                 *last_used_idx = vq->last_used_idx;
1442         }
1443
1444         return 0;
1445 }
1446
1447 int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
1448                 uint16_t last_avail_idx, uint16_t last_used_idx)
1449 {
1450         struct vhost_virtqueue *vq;
1451         struct virtio_net *dev = get_device(vid);
1452
1453         if (!dev)
1454                 return -1;
1455
1456         vq = dev->virtqueue[queue_id];
1457         if (!vq)
1458                 return -1;
1459
1460         if (vq_is_packed(dev)) {
1461                 vq->last_avail_idx = last_avail_idx & 0x7fff;
1462                 vq->avail_wrap_counter = !!(last_avail_idx & (1 << 15));
1463                 vq->last_used_idx = last_used_idx & 0x7fff;
1464                 vq->used_wrap_counter = !!(last_used_idx & (1 << 15));
1465         } else {
1466                 vq->last_avail_idx = last_avail_idx;
1467                 vq->last_used_idx = last_used_idx;
1468         }
1469
1470         return 0;
1471 }
1472
1473 int
1474 rte_vhost_get_vring_base_from_inflight(int vid,
1475                                        uint16_t queue_id,
1476                                        uint16_t *last_avail_idx,
1477                                        uint16_t *last_used_idx)
1478 {
1479         struct rte_vhost_inflight_info_packed *inflight_info;
1480         struct virtio_net *dev = get_device(vid);
1481
1482         if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1483                 return -1;
1484
1485         if (!vq_is_packed(dev))
1486                 return -1;
1487
1488         inflight_info = dev->virtqueue[queue_id]->inflight_packed;
1489         if (!inflight_info)
1490                 return -1;
1491
1492         *last_avail_idx = (inflight_info->old_used_wrap_counter << 15) |
1493                           inflight_info->old_used_idx;
1494         *last_used_idx = *last_avail_idx;
1495
1496         return 0;
1497 }
1498
1499 int rte_vhost_extern_callback_register(int vid,
1500                 struct rte_vhost_user_extern_ops const * const ops, void *ctx)
1501 {
1502         struct virtio_net *dev = get_device(vid);
1503
1504         if (dev == NULL || ops == NULL)
1505                 return -1;
1506
1507         dev->extern_ops = *ops;
1508         dev->extern_data = ctx;
1509         return 0;
1510 }
1511
1512 RTE_LOG_REGISTER(vhost_config_log_level, lib.vhost.config, INFO);
1513 RTE_LOG_REGISTER(vhost_data_log_level, lib.vhost.data, WARNING);