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 int vhost_config_log_level;
  31 int vhost_data_log_level;
  32
  33 /* Called with iotlb_lock read-locked */
  34 uint64_t
  35 __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
  36                     uint64_t iova, uint64_t *size, uint8_t perm)
  37 {
  38         uint64_t vva, tmp_size;
  39
  40         if (unlikely(!*size))
  41                 return 0;
  42
  43         tmp_size = *size;
  44
  45         vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
  46         if (tmp_size == *size)
  47                 return vva;
  48
  49         iova += tmp_size;
  50
  51         if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
  52                 /*
  53                  * iotlb_lock is read-locked for a full burst,
  54                  * but it only protects the iotlb cache.
  55                  * In case of IOTLB miss, we might block on the socket,
  56                  * which could cause a deadlock with QEMU if an IOTLB update
  57                  * is being handled. We can safely unlock here to avoid it.
  58                  */
  59                 vhost_user_iotlb_rd_unlock(vq);
  60
  61                 vhost_user_iotlb_pending_insert(vq, iova, perm);
  62                 if (vhost_user_iotlb_miss(dev, iova, perm)) {
  63                         VHOST_LOG_CONFIG(ERR,
  64                                 "IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
  65                                 iova);
  66                         vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
  67                 }
  68
  69                 vhost_user_iotlb_rd_lock(vq);
  70         }
  71
  72         return 0;
  73 }
  74
  75 #define VHOST_LOG_PAGE  4096
  76
  77 /*
  78  * Atomically set a bit in memory.
  79  */
  80 static __rte_always_inline void
  81 vhost_set_bit(unsigned int nr, volatile uint8_t *addr)
  82 {
  83 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
  84         /*
  85          * __sync_ built-ins are deprecated, but __atomic_ ones
  86          * are sub-optimized in older GCC versions.
  87          */
  88         __sync_fetch_and_or_1(addr, (1U << nr));
  89 #else
  90         __atomic_fetch_or(addr, (1U << nr), __ATOMIC_RELAXED);
  91 #endif
  92 }
  93
  94 static __rte_always_inline void
  95 vhost_log_page(uint8_t *log_base, uint64_t page)
  96 {
  97         vhost_set_bit(page % 8, &log_base[page / 8]);
  98 }
  99
 100 void
 101 __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
 102 {
 103         uint64_t page;
 104
 105         if (unlikely(!dev->log_base || !len))
 106                 return;
 107
 108         if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
 109                 return;
 110
 111         /* To make sure guest memory updates are committed before logging */
 112         rte_smp_wmb();
 113
 114         page = addr / VHOST_LOG_PAGE;
 115         while (page * VHOST_LOG_PAGE < addr + len) {
 116                 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
 117                 page += 1;
 118         }
 119 }
 120
 121 void
 122 __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
 123                              uint64_t iova, uint64_t len)
 124 {
 125         uint64_t hva, gpa, map_len;
 126         map_len = len;
 127
 128         hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
 129         if (map_len != len) {
 130                 VHOST_LOG_DATA(ERR,
 131                         "Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
 132                         iova);
 133                 return;
 134         }
 135
 136         gpa = hva_to_gpa(dev, hva, len);
 137         if (gpa)
 138                 __vhost_log_write(dev, gpa, len);
 139 }
 140
 141 void
 142 __vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
 143 {
 144         unsigned long *log_base;
 145         int i;
 146
 147         if (unlikely(!dev->log_base))
 148                 return;
 149
 150         rte_smp_wmb();
 151
 152         log_base = (unsigned long *)(uintptr_t)dev->log_base;
 153
 154         for (i = 0; i < vq->log_cache_nb_elem; i++) {
 155                 struct log_cache_entry *elem = vq->log_cache + i;
 156
 157 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
 158                 /*
 159                  * '__sync' builtins are deprecated, but '__atomic' ones
 160                  * are sub-optimized in older GCC versions.
 161                  */
 162                 __sync_fetch_and_or(log_base + elem->offset, elem->val);
 163 #else
 164                 __atomic_fetch_or(log_base + elem->offset, elem->val,
 165                                 __ATOMIC_RELAXED);
 166 #endif
 167         }
 168
 169         rte_smp_wmb();
 170
 171         vq->log_cache_nb_elem = 0;
 172 }
 173
 174 static __rte_always_inline void
 175 vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq,
 176                         uint64_t page)
 177 {
 178         uint32_t bit_nr = page % (sizeof(unsigned long) << 3);
 179         uint32_t offset = page / (sizeof(unsigned long) << 3);
 180         int i;
 181
 182         for (i = 0; i < vq->log_cache_nb_elem; i++) {
 183                 struct log_cache_entry *elem = vq->log_cache + i;
 184
 185                 if (elem->offset == offset) {
 186                         elem->val |= (1UL << bit_nr);
 187                         return;
 188                 }
 189         }
 190
 191         if (unlikely(i >= VHOST_LOG_CACHE_NR)) {
 192                 /*
 193                  * No more room for a new log cache entry,
 194                  * so write the dirty log map directly.
 195                  */
 196                 rte_smp_wmb();
 197                 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
 198
 199                 return;
 200         }
 201
 202         vq->log_cache[i].offset = offset;
 203         vq->log_cache[i].val = (1UL << bit_nr);
 204         vq->log_cache_nb_elem++;
 205 }
 206
 207 void
 208 __vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
 209                         uint64_t addr, uint64_t len)
 210 {
 211         uint64_t page;
 212
 213         if (unlikely(!dev->log_base || !len))
 214                 return;
 215
 216         if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
 217                 return;
 218
 219         page = addr / VHOST_LOG_PAGE;
 220         while (page * VHOST_LOG_PAGE < addr + len) {
 221                 vhost_log_cache_page(dev, vq, page);
 222                 page += 1;
 223         }
 224 }
 225
 226 void
 227 __vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
 228                              uint64_t iova, uint64_t len)
 229 {
 230         uint64_t hva, gpa, map_len;
 231         map_len = len;
 232
 233         hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
 234         if (map_len != len) {
 235                 VHOST_LOG_DATA(ERR,
 236                         "Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
 237                         iova);
 238                 return;
 239         }
 240
 241         gpa = hva_to_gpa(dev, hva, len);
 242         if (gpa)
 243                 __vhost_log_cache_write(dev, vq, gpa, len);
 244 }
 245
 246 void *
 247 vhost_alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
 248                 uint64_t desc_addr, uint64_t desc_len)
 249 {
 250         void *idesc;
 251         uint64_t src, dst;
 252         uint64_t len, remain = desc_len;
 253
 254         idesc = rte_malloc(__func__, desc_len, 0);
 255         if (unlikely(!idesc))
 256                 return NULL;
 257
 258         dst = (uint64_t)(uintptr_t)idesc;
 259
 260         while (remain) {
 261                 len = remain;
 262                 src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
 263                                 VHOST_ACCESS_RO);
 264                 if (unlikely(!src || !len)) {
 265                         rte_free(idesc);
 266                         return NULL;
 267                 }
 268
 269                 rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
 270
 271                 remain -= len;
 272                 dst += len;
 273                 desc_addr += len;
 274         }
 275
 276         return idesc;
 277 }
 278
 279 void
 280 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
 281 {
 282         if ((vq->callfd >= 0) && (destroy != 0))
 283                 close(vq->callfd);
 284         if (vq->kickfd >= 0)
 285                 close(vq->kickfd);
 286 }
 287
 288 void
 289 cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq)
 290 {
 291         if (!(dev->protocol_features &
 292             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
 293                 return;
 294
 295         if (vq_is_packed(dev)) {
 296                 if (vq->inflight_packed)
 297                         vq->inflight_packed = NULL;
 298         } else {
 299                 if (vq->inflight_split)
 300                         vq->inflight_split = NULL;
 301         }
 302
 303         if (vq->resubmit_inflight) {
 304                 if (vq->resubmit_inflight->resubmit_list) {
 305                         free(vq->resubmit_inflight->resubmit_list);
 306                         vq->resubmit_inflight->resubmit_list = NULL;
 307                 }
 308                 free(vq->resubmit_inflight);
 309                 vq->resubmit_inflight = NULL;
 310         }
 311 }
 312
 313 /*
 314  * Unmap any memory, close any file descriptors and
 315  * free any memory owned by a device.
 316  */
 317 void
 318 cleanup_device(struct virtio_net *dev, int destroy)
 319 {
 320         uint32_t i;
 321
 322         vhost_backend_cleanup(dev);
 323
 324         for (i = 0; i < dev->nr_vring; i++) {
 325                 cleanup_vq(dev->virtqueue[i], destroy);
 326                 cleanup_vq_inflight(dev, dev->virtqueue[i]);
 327         }
 328 }
 329
 330 void
 331 free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq)
 332 {
 333         if (vq_is_packed(dev))
 334                 rte_free(vq->shadow_used_packed);
 335         else
 336                 rte_free(vq->shadow_used_split);
 337         rte_free(vq->batch_copy_elems);
 338         rte_mempool_free(vq->iotlb_pool);
 339         rte_free(vq);
 340 }
 341
 342 /*
 343  * Release virtqueues and device memory.
 344  */
 345 static void
 346 free_device(struct virtio_net *dev)
 347 {
 348         uint32_t i;
 349
 350         for (i = 0; i < dev->nr_vring; i++)
 351                 free_vq(dev, dev->virtqueue[i]);
 352
 353         rte_free(dev);
 354 }
 355
 356 static __rte_always_inline int
 357 log_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 358 {
 359         if (likely(!(vq->ring_addrs.flags & (1 << VHOST_VRING_F_LOG))))
 360                 return 0;
 361
 362         vq->log_guest_addr = translate_log_addr(dev, vq,
 363                                                 vq->ring_addrs.log_guest_addr);
 364         if (vq->log_guest_addr == 0)
 365                 return -1;
 366
 367         return 0;
 368 }
 369
 370 /*
 371  * Converts vring log address to GPA
 372  * If IOMMU is enabled, the log address is IOVA
 373  * If IOMMU not enabled, the log address is already GPA
 374  *
 375  * Caller should have iotlb_lock read-locked
 376  */
 377 uint64_t
 378 translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
 379                 uint64_t log_addr)
 380 {
 381         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 382                 const uint64_t exp_size = sizeof(uint64_t);
 383                 uint64_t hva, gpa;
 384                 uint64_t size = exp_size;
 385
 386                 hva = vhost_iova_to_vva(dev, vq, log_addr,
 387                                         &size, VHOST_ACCESS_RW);
 388
 389                 if (size != exp_size)
 390                         return 0;
 391
 392                 gpa = hva_to_gpa(dev, hva, exp_size);
 393                 if (!gpa) {
 394                         VHOST_LOG_CONFIG(ERR,
 395                                 "VQ: Failed to find GPA for log_addr: 0x%"
 396                                 PRIx64 " hva: 0x%" PRIx64 "\n",
 397                                 log_addr, hva);
 398                         return 0;
 399                 }
 400                 return gpa;
 401
 402         } else
 403                 return log_addr;
 404 }
 405
 406 /* Caller should have iotlb_lock read-locked */
 407 static int
 408 vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
 409 {
 410         uint64_t req_size, size;
 411
 412         req_size = sizeof(struct vring_desc) * vq->size;
 413         size = req_size;
 414         vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 415                                                 vq->ring_addrs.desc_user_addr,
 416                                                 &size, VHOST_ACCESS_RW);
 417         if (!vq->desc || size != req_size)
 418                 return -1;
 419
 420         req_size = sizeof(struct vring_avail);
 421         req_size += sizeof(uint16_t) * vq->size;
 422         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 423                 req_size += sizeof(uint16_t);
 424         size = req_size;
 425         vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 426                                                 vq->ring_addrs.avail_user_addr,
 427                                                 &size, VHOST_ACCESS_RW);
 428         if (!vq->avail || size != req_size)
 429                 return -1;
 430
 431         req_size = sizeof(struct vring_used);
 432         req_size += sizeof(struct vring_used_elem) * vq->size;
 433         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 434                 req_size += sizeof(uint16_t);
 435         size = req_size;
 436         vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 437                                                 vq->ring_addrs.used_user_addr,
 438                                                 &size, VHOST_ACCESS_RW);
 439         if (!vq->used || size != req_size)
 440                 return -1;
 441
 442         return 0;
 443 }
 444
 445 /* Caller should have iotlb_lock read-locked */
 446 static int
 447 vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
 448 {
 449         uint64_t req_size, size;
 450
 451         req_size = sizeof(struct vring_packed_desc) * vq->size;
 452         size = req_size;
 453         vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 454                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.desc_user_addr,
 455                                 &size, VHOST_ACCESS_RW);
 456         if (!vq->desc_packed || size != req_size)
 457                 return -1;
 458
 459         req_size = sizeof(struct vring_packed_desc_event);
 460         size = req_size;
 461         vq->driver_event = (struct vring_packed_desc_event *)(uintptr_t)
 462                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.avail_user_addr,
 463                                 &size, VHOST_ACCESS_RW);
 464         if (!vq->driver_event || size != req_size)
 465                 return -1;
 466
 467         req_size = sizeof(struct vring_packed_desc_event);
 468         size = req_size;
 469         vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
 470                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.used_user_addr,
 471                                 &size, VHOST_ACCESS_RW);
 472         if (!vq->device_event || size != req_size)
 473                 return -1;
 474
 475         return 0;
 476 }
 477
 478 int
 479 vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 480 {
 481
 482         if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
 483                 return -1;
 484
 485         if (vq_is_packed(dev)) {
 486                 if (vring_translate_packed(dev, vq) < 0)
 487                         return -1;
 488         } else {
 489                 if (vring_translate_split(dev, vq) < 0)
 490                         return -1;
 491         }
 492
 493         if (log_translate(dev, vq) < 0)
 494                 return -1;
 495
 496         vq->access_ok = 1;
 497
 498         return 0;
 499 }
 500
 501 void
 502 vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 503 {
 504         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 505                 vhost_user_iotlb_wr_lock(vq);
 506
 507         vq->access_ok = 0;
 508         vq->desc = NULL;
 509         vq->avail = NULL;
 510         vq->used = NULL;
 511         vq->log_guest_addr = 0;
 512
 513         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 514                 vhost_user_iotlb_wr_unlock(vq);
 515 }
 516
 517 static void
 518 init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 519 {
 520         struct vhost_virtqueue *vq;
 521
 522         if (vring_idx >= VHOST_MAX_VRING) {
 523                 VHOST_LOG_CONFIG(ERR,
 524                                 "Failed not init vring, out of bound (%d)\n",
 525                                 vring_idx);
 526                 return;
 527         }
 528
 529         vq = dev->virtqueue[vring_idx];
 530
 531         memset(vq, 0, sizeof(struct vhost_virtqueue));
 532
 533         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 534         vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
 535
 536         vhost_user_iotlb_init(dev, vring_idx);
 537         /* Backends are set to -1 indicating an inactive device. */
 538         vq->backend = -1;
 539
 540         TAILQ_INIT(&vq->zmbuf_list);
 541 }
 542
 543 static void
 544 reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 545 {
 546         struct vhost_virtqueue *vq;
 547         int callfd;
 548
 549         if (vring_idx >= VHOST_MAX_VRING) {
 550                 VHOST_LOG_CONFIG(ERR,
 551                                 "Failed not init vring, out of bound (%d)\n",
 552                                 vring_idx);
 553                 return;
 554         }
 555
 556         vq = dev->virtqueue[vring_idx];
 557         callfd = vq->callfd;
 558         init_vring_queue(dev, vring_idx);
 559         vq->callfd = callfd;
 560 }
 561
 562 int
 563 alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 564 {
 565         struct vhost_virtqueue *vq;
 566
 567         vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
 568         if (vq == NULL) {
 569                 VHOST_LOG_CONFIG(ERR,
 570                         "Failed to allocate memory for vring:%u.\n", vring_idx);
 571                 return -1;
 572         }
 573
 574         dev->virtqueue[vring_idx] = vq;
 575         init_vring_queue(dev, vring_idx);
 576         rte_spinlock_init(&vq->access_lock);
 577         vq->avail_wrap_counter = 1;
 578         vq->used_wrap_counter = 1;
 579         vq->signalled_used_valid = false;
 580
 581         dev->nr_vring += 1;
 582
 583         return 0;
 584 }
 585
 586 /*
 587  * Reset some variables in device structure, while keeping few
 588  * others untouched, such as vid, ifname, nr_vring: they
 589  * should be same unless the device is removed.
 590  */
 591 void
 592 reset_device(struct virtio_net *dev)
 593 {
 594         uint32_t i;
 595
 596         dev->features = 0;
 597         dev->protocol_features = 0;
 598         dev->flags &= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 599
 600         for (i = 0; i < dev->nr_vring; i++)
 601                 reset_vring_queue(dev, i);
 602 }
 603
 604 /*
 605  * Invoked when there is a new vhost-user connection established (when
 606  * there is a new virtio device being attached).
 607  */
 608 int
 609 vhost_new_device(void)
 610 {
 611         struct virtio_net *dev;
 612         int i;
 613
 614         for (i = 0; i < MAX_VHOST_DEVICE; i++) {
 615                 if (vhost_devices[i] == NULL)
 616                         break;
 617         }
 618
 619         if (i == MAX_VHOST_DEVICE) {
 620                 VHOST_LOG_CONFIG(ERR,
 621                         "Failed to find a free slot for new device.\n");
 622                 return -1;
 623         }
 624
 625         dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
 626         if (dev == NULL) {
 627                 VHOST_LOG_CONFIG(ERR,
 628                         "Failed to allocate memory for new dev.\n");
 629                 return -1;
 630         }
 631
 632         vhost_devices[i] = dev;
 633         dev->vid = i;
 634         dev->flags = VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 635         dev->slave_req_fd = -1;
 636         dev->vdpa_dev_id = -1;
 637         dev->postcopy_ufd = -1;
 638         rte_spinlock_init(&dev->slave_req_lock);
 639
 640         return i;
 641 }
 642
 643 void
 644 vhost_destroy_device_notify(struct virtio_net *dev)
 645 {
 646         struct rte_vdpa_device *vdpa_dev;
 647         int did;
 648
 649         if (dev->flags & VIRTIO_DEV_RUNNING) {
 650                 did = dev->vdpa_dev_id;
 651                 vdpa_dev = rte_vdpa_get_device(did);
 652                 if (vdpa_dev && vdpa_dev->ops->dev_close)
 653                         vdpa_dev->ops->dev_close(dev->vid);
 654                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 655                 dev->notify_ops->destroy_device(dev->vid);
 656         }
 657 }
 658
 659 /*
 660  * Invoked when there is the vhost-user connection is broken (when
 661  * the virtio device is being detached).
 662  */
 663 void
 664 vhost_destroy_device(int vid)
 665 {
 666         struct virtio_net *dev = get_device(vid);
 667
 668         if (dev == NULL)
 669                 return;
 670
 671         vhost_destroy_device_notify(dev);
 672
 673         cleanup_device(dev, 1);
 674         free_device(dev);
 675
 676         vhost_devices[vid] = NULL;
 677 }
 678
 679 void
 680 vhost_attach_vdpa_device(int vid, int did)
 681 {
 682         struct virtio_net *dev = get_device(vid);
 683
 684         if (dev == NULL)
 685                 return;
 686
 687         if (rte_vdpa_get_device(did) == NULL)
 688                 return;
 689
 690         dev->vdpa_dev_id = did;
 691 }
 692
 693 void
 694 vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
 695 {
 696         struct virtio_net *dev;
 697         unsigned int len;
 698
 699         dev = get_device(vid);
 700         if (dev == NULL)
 701                 return;
 702
 703         len = if_len > sizeof(dev->ifname) ?
 704                 sizeof(dev->ifname) : if_len;
 705
 706         strncpy(dev->ifname, if_name, len);
 707         dev->ifname[sizeof(dev->ifname) - 1] = '\0';
 708 }
 709
 710 void
 711 vhost_enable_dequeue_zero_copy(int vid)
 712 {
 713         struct virtio_net *dev = get_device(vid);
 714
 715         if (dev == NULL)
 716                 return;
 717
 718         dev->dequeue_zero_copy = 1;
 719 }
 720
 721 void
 722 vhost_set_builtin_virtio_net(int vid, bool enable)
 723 {
 724         struct virtio_net *dev = get_device(vid);
 725
 726         if (dev == NULL)
 727                 return;
 728
 729         if (enable)
 730                 dev->flags |= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 731         else
 732                 dev->flags &= ~VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 733 }
 734
 735 void
 736 vhost_enable_extbuf(int vid)
 737 {
 738         struct virtio_net *dev = get_device(vid);
 739
 740         if (dev == NULL)
 741                 return;
 742
 743         dev->extbuf = 1;
 744 }
 745
 746 void
 747 vhost_enable_linearbuf(int vid)
 748 {
 749         struct virtio_net *dev = get_device(vid);
 750
 751         if (dev == NULL)
 752                 return;
 753
 754         dev->linearbuf = 1;
 755 }
 756
 757 int
 758 rte_vhost_get_mtu(int vid, uint16_t *mtu)
 759 {
 760         struct virtio_net *dev = get_device(vid);
 761
 762         if (dev == NULL || mtu == NULL)
 763                 return -ENODEV;
 764
 765         if (!(dev->flags & VIRTIO_DEV_READY))
 766                 return -EAGAIN;
 767
 768         if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
 769                 return -ENOTSUP;
 770
 771         *mtu = dev->mtu;
 772
 773         return 0;
 774 }
 775
 776 int
 777 rte_vhost_get_numa_node(int vid)
 778 {
 779 #ifdef RTE_LIBRTE_VHOST_NUMA
 780         struct virtio_net *dev = get_device(vid);
 781         int numa_node;
 782         int ret;
 783
 784         if (dev == NULL || numa_available() != 0)
 785                 return -1;
 786
 787         ret = get_mempolicy(&numa_node, NULL, 0, dev,
 788                             MPOL_F_NODE | MPOL_F_ADDR);
 789         if (ret < 0) {
 790                 VHOST_LOG_CONFIG(ERR,
 791                         "(%d) failed to query numa node: %s\n",
 792                         vid, rte_strerror(errno));
 793                 return -1;
 794         }
 795
 796         return numa_node;
 797 #else
 798         RTE_SET_USED(vid);
 799         return -1;
 800 #endif
 801 }
 802
 803 uint32_t
 804 rte_vhost_get_queue_num(int vid)
 805 {
 806         struct virtio_net *dev = get_device(vid);
 807
 808         if (dev == NULL)
 809                 return 0;
 810
 811         return dev->nr_vring / 2;
 812 }
 813
 814 uint16_t
 815 rte_vhost_get_vring_num(int vid)
 816 {
 817         struct virtio_net *dev = get_device(vid);
 818
 819         if (dev == NULL)
 820                 return 0;
 821
 822         return dev->nr_vring;
 823 }
 824
 825 int
 826 rte_vhost_get_ifname(int vid, char *buf, size_t len)
 827 {
 828         struct virtio_net *dev = get_device(vid);
 829
 830         if (dev == NULL || buf == NULL)
 831                 return -1;
 832
 833         len = RTE_MIN(len, sizeof(dev->ifname));
 834
 835         strncpy(buf, dev->ifname, len);
 836         buf[len - 1] = '\0';
 837
 838         return 0;
 839 }
 840
 841 int
 842 rte_vhost_get_negotiated_features(int vid, uint64_t *features)
 843 {
 844         struct virtio_net *dev;
 845
 846         dev = get_device(vid);
 847         if (dev == NULL || features == NULL)
 848                 return -1;
 849
 850         *features = dev->features;
 851         return 0;
 852 }
 853
 854 int
 855 rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
 856 {
 857         struct virtio_net *dev;
 858         struct rte_vhost_memory *m;
 859         size_t size;
 860
 861         dev = get_device(vid);
 862         if (dev == NULL || mem == NULL)
 863                 return -1;
 864
 865         size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
 866         m = malloc(sizeof(struct rte_vhost_memory) + size);
 867         if (!m)
 868                 return -1;
 869
 870         m->nregions = dev->mem->nregions;
 871         memcpy(m->regions, dev->mem->regions, size);
 872         *mem = m;
 873
 874         return 0;
 875 }
 876
 877 int
 878 rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
 879                           struct rte_vhost_vring *vring)
 880 {
 881         struct virtio_net *dev;
 882         struct vhost_virtqueue *vq;
 883
 884         dev = get_device(vid);
 885         if (dev == NULL || vring == NULL)
 886                 return -1;
 887
 888         if (vring_idx >= VHOST_MAX_VRING)
 889                 return -1;
 890
 891         vq = dev->virtqueue[vring_idx];
 892         if (!vq)
 893                 return -1;
 894
 895         if (vq_is_packed(dev)) {
 896                 vring->desc_packed = vq->desc_packed;
 897                 vring->driver_event = vq->driver_event;
 898                 vring->device_event = vq->device_event;
 899         } else {
 900                 vring->desc = vq->desc;
 901                 vring->avail = vq->avail;
 902                 vring->used = vq->used;
 903         }
 904         vring->log_guest_addr  = vq->log_guest_addr;
 905
 906         vring->callfd  = vq->callfd;
 907         vring->kickfd  = vq->kickfd;
 908         vring->size    = vq->size;
 909
 910         return 0;
 911 }
 912
 913 int
 914 rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
 915                                   struct rte_vhost_ring_inflight *vring)
 916 {
 917         struct virtio_net *dev;
 918         struct vhost_virtqueue *vq;
 919
 920         dev = get_device(vid);
 921         if (unlikely(!dev))
 922                 return -1;
 923
 924         if (vring_idx >= VHOST_MAX_VRING)
 925                 return -1;
 926
 927         vq = dev->virtqueue[vring_idx];
 928         if (unlikely(!vq))
 929                 return -1;
 930
 931         if (vq_is_packed(dev)) {
 932                 if (unlikely(!vq->inflight_packed))
 933                         return -1;
 934
 935                 vring->inflight_packed = vq->inflight_packed;
 936         } else {
 937                 if (unlikely(!vq->inflight_split))
 938                         return -1;
 939
 940                 vring->inflight_split = vq->inflight_split;
 941         }
 942
 943         vring->resubmit_inflight = vq->resubmit_inflight;
 944
 945         return 0;
 946 }
 947
 948 int
 949 rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
 950                                   uint16_t idx)
 951 {
 952         struct vhost_virtqueue *vq;
 953         struct virtio_net *dev;
 954
 955         dev = get_device(vid);
 956         if (unlikely(!dev))
 957                 return -1;
 958
 959         if (unlikely(!(dev->protocol_features &
 960             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
 961                 return 0;
 962
 963         if (unlikely(vq_is_packed(dev)))
 964                 return -1;
 965
 966         if (unlikely(vring_idx >= VHOST_MAX_VRING))
 967                 return -1;
 968
 969         vq = dev->virtqueue[vring_idx];
 970         if (unlikely(!vq))
 971                 return -1;
 972
 973         if (unlikely(!vq->inflight_split))
 974                 return -1;
 975
 976         if (unlikely(idx >= vq->size))
 977                 return -1;
 978
 979         vq->inflight_split->desc[idx].counter = vq->global_counter++;
 980         vq->inflight_split->desc[idx].inflight = 1;
 981         return 0;
 982 }
 983
 984 int
 985 rte_vhost_set_inflight_desc_packed(int vid, uint16_t vring_idx,
 986                                    uint16_t head, uint16_t last,
 987                                    uint16_t *inflight_entry)
 988 {
 989         struct rte_vhost_inflight_info_packed *inflight_info;
 990         struct virtio_net *dev;
 991         struct vhost_virtqueue *vq;
 992         struct vring_packed_desc *desc;
 993         uint16_t old_free_head, free_head;
 994
 995         dev = get_device(vid);
 996         if (unlikely(!dev))
 997                 return -1;
 998
 999         if (unlikely(!(dev->protocol_features &
1000             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1001                 return 0;
1002
1003         if (unlikely(!vq_is_packed(dev)))
1004                 return -1;
1005
1006         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1007                 return -1;
1008
1009         vq = dev->virtqueue[vring_idx];
1010         if (unlikely(!vq))
1011                 return -1;
1012
1013         inflight_info = vq->inflight_packed;
1014         if (unlikely(!inflight_info))
1015                 return -1;
1016
1017         if (unlikely(head >= vq->size))
1018                 return -1;
1019
1020         desc = vq->desc_packed;
1021         old_free_head = inflight_info->old_free_head;
1022         if (unlikely(old_free_head >= vq->size))
1023                 return -1;
1024
1025         free_head = old_free_head;
1026
1027         /* init header descriptor */
1028         inflight_info->desc[old_free_head].num = 0;
1029         inflight_info->desc[old_free_head].counter = vq->global_counter++;
1030         inflight_info->desc[old_free_head].inflight = 1;
1031
1032         /* save desc entry in flight entry */
1033         while (head != ((last + 1) % vq->size)) {
1034                 inflight_info->desc[old_free_head].num++;
1035                 inflight_info->desc[free_head].addr = desc[head].addr;
1036                 inflight_info->desc[free_head].len = desc[head].len;
1037                 inflight_info->desc[free_head].flags = desc[head].flags;
1038                 inflight_info->desc[free_head].id = desc[head].id;
1039
1040                 inflight_info->desc[old_free_head].last = free_head;
1041                 free_head = inflight_info->desc[free_head].next;
1042                 inflight_info->free_head = free_head;
1043                 head = (head + 1) % vq->size;
1044         }
1045
1046         inflight_info->old_free_head = free_head;
1047         *inflight_entry = old_free_head;
1048
1049         return 0;
1050 }
1051
1052 int
1053 rte_vhost_clr_inflight_desc_split(int vid, uint16_t vring_idx,
1054                                   uint16_t last_used_idx, uint16_t idx)
1055 {
1056         struct virtio_net *dev;
1057         struct vhost_virtqueue *vq;
1058
1059         dev = get_device(vid);
1060         if (unlikely(!dev))
1061                 return -1;
1062
1063         if (unlikely(!(dev->protocol_features &
1064             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1065                 return 0;
1066
1067         if (unlikely(vq_is_packed(dev)))
1068                 return -1;
1069
1070         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1071                 return -1;
1072
1073         vq = dev->virtqueue[vring_idx];
1074         if (unlikely(!vq))
1075                 return -1;
1076
1077         if (unlikely(!vq->inflight_split))
1078                 return -1;
1079
1080         if (unlikely(idx >= vq->size))
1081                 return -1;
1082
1083         rte_smp_mb();
1084
1085         vq->inflight_split->desc[idx].inflight = 0;
1086
1087         rte_smp_mb();
1088
1089         vq->inflight_split->used_idx = last_used_idx;
1090         return 0;
1091 }
1092
1093 int
1094 rte_vhost_clr_inflight_desc_packed(int vid, uint16_t vring_idx,
1095                                    uint16_t head)
1096 {
1097         struct rte_vhost_inflight_info_packed *inflight_info;
1098         struct virtio_net *dev;
1099         struct vhost_virtqueue *vq;
1100
1101         dev = get_device(vid);
1102         if (unlikely(!dev))
1103                 return -1;
1104
1105         if (unlikely(!(dev->protocol_features &
1106             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1107                 return 0;
1108
1109         if (unlikely(!vq_is_packed(dev)))
1110                 return -1;
1111
1112         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1113                 return -1;
1114
1115         vq = dev->virtqueue[vring_idx];
1116         if (unlikely(!vq))
1117                 return -1;
1118
1119         inflight_info = vq->inflight_packed;
1120         if (unlikely(!inflight_info))
1121                 return -1;
1122
1123         if (unlikely(head >= vq->size))
1124                 return -1;
1125
1126         rte_smp_mb();
1127
1128         inflight_info->desc[head].inflight = 0;
1129
1130         rte_smp_mb();
1131
1132         inflight_info->old_free_head = inflight_info->free_head;
1133         inflight_info->old_used_idx = inflight_info->used_idx;
1134         inflight_info->old_used_wrap_counter = inflight_info->used_wrap_counter;
1135
1136         return 0;
1137 }
1138
1139 int
1140 rte_vhost_set_last_inflight_io_split(int vid, uint16_t vring_idx,
1141                                      uint16_t idx)
1142 {
1143         struct virtio_net *dev;
1144         struct vhost_virtqueue *vq;
1145
1146         dev = get_device(vid);
1147         if (unlikely(!dev))
1148                 return -1;
1149
1150         if (unlikely(!(dev->protocol_features &
1151             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1152                 return 0;
1153
1154         if (unlikely(vq_is_packed(dev)))
1155                 return -1;
1156
1157         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1158                 return -1;
1159
1160         vq = dev->virtqueue[vring_idx];
1161         if (unlikely(!vq))
1162                 return -1;
1163
1164         if (unlikely(!vq->inflight_split))
1165                 return -1;
1166
1167         vq->inflight_split->last_inflight_io = idx;
1168         return 0;
1169 }
1170
1171 int
1172 rte_vhost_set_last_inflight_io_packed(int vid, uint16_t vring_idx,
1173                                       uint16_t head)
1174 {
1175         struct rte_vhost_inflight_info_packed *inflight_info;
1176         struct virtio_net *dev;
1177         struct vhost_virtqueue *vq;
1178         uint16_t last;
1179
1180         dev = get_device(vid);
1181         if (unlikely(!dev))
1182                 return -1;
1183
1184         if (unlikely(!(dev->protocol_features &
1185             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1186                 return 0;
1187
1188         if (unlikely(!vq_is_packed(dev)))
1189                 return -1;
1190
1191         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1192                 return -1;
1193
1194         vq = dev->virtqueue[vring_idx];
1195         if (unlikely(!vq))
1196                 return -1;
1197
1198         inflight_info = vq->inflight_packed;
1199         if (unlikely(!inflight_info))
1200                 return -1;
1201
1202         if (unlikely(head >= vq->size))
1203                 return -1;
1204
1205         last = inflight_info->desc[head].last;
1206         if (unlikely(last >= vq->size))
1207                 return -1;
1208
1209         inflight_info->desc[last].next = inflight_info->free_head;
1210         inflight_info->free_head = head;
1211         inflight_info->used_idx += inflight_info->desc[head].num;
1212         if (inflight_info->used_idx >= inflight_info->desc_num) {
1213                 inflight_info->used_idx -= inflight_info->desc_num;
1214                 inflight_info->used_wrap_counter =
1215                         !inflight_info->used_wrap_counter;
1216         }
1217
1218         return 0;
1219 }
1220
1221 int
1222 rte_vhost_vring_call(int vid, uint16_t vring_idx)
1223 {
1224         struct virtio_net *dev;
1225         struct vhost_virtqueue *vq;
1226
1227         dev = get_device(vid);
1228         if (!dev)
1229                 return -1;
1230
1231         if (vring_idx >= VHOST_MAX_VRING)
1232                 return -1;
1233
1234         vq = dev->virtqueue[vring_idx];
1235         if (!vq)
1236                 return -1;
1237
1238         if (vq_is_packed(dev))
1239                 vhost_vring_call_packed(dev, vq);
1240         else
1241                 vhost_vring_call_split(dev, vq);
1242
1243         return 0;
1244 }
1245
1246 uint16_t
1247 rte_vhost_avail_entries(int vid, uint16_t queue_id)
1248 {
1249         struct virtio_net *dev;
1250         struct vhost_virtqueue *vq;
1251         uint16_t ret = 0;
1252
1253         dev = get_device(vid);
1254         if (!dev)
1255                 return 0;
1256
1257         vq = dev->virtqueue[queue_id];
1258
1259         rte_spinlock_lock(&vq->access_lock);
1260
1261         if (unlikely(!vq->enabled || vq->avail == NULL))
1262                 goto out;
1263
1264         ret = *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
1265
1266 out:
1267         rte_spinlock_unlock(&vq->access_lock);
1268         return ret;
1269 }
1270
1271 static inline int
1272 vhost_enable_notify_split(struct virtio_net *dev,
1273                 struct vhost_virtqueue *vq, int enable)
1274 {
1275         if (vq->used == NULL)
1276                 return -1;
1277
1278         if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
1279                 if (enable)
1280                         vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
1281                 else
1282                         vq->used->flags |= VRING_USED_F_NO_NOTIFY;
1283         } else {
1284                 if (enable)
1285                         vhost_avail_event(vq) = vq->last_avail_idx;
1286         }
1287         return 0;
1288 }
1289
1290 static inline int
1291 vhost_enable_notify_packed(struct virtio_net *dev,
1292                 struct vhost_virtqueue *vq, int enable)
1293 {
1294         uint16_t flags;
1295
1296         if (vq->device_event == NULL)
1297                 return -1;
1298
1299         if (!enable) {
1300                 vq->device_event->flags = VRING_EVENT_F_DISABLE;
1301                 return 0;
1302         }
1303
1304         flags = VRING_EVENT_F_ENABLE;
1305         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
1306                 flags = VRING_EVENT_F_DESC;
1307                 vq->device_event->off_wrap = vq->last_avail_idx |
1308                         vq->avail_wrap_counter << 15;
1309         }
1310
1311         rte_smp_wmb();
1312
1313         vq->device_event->flags = flags;
1314         return 0;
1315 }
1316
1317 int
1318 rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
1319 {
1320         struct virtio_net *dev = get_device(vid);
1321         struct vhost_virtqueue *vq;
1322         int ret;
1323
1324         if (!dev)
1325                 return -1;
1326
1327         vq = dev->virtqueue[queue_id];
1328
1329         rte_spinlock_lock(&vq->access_lock);
1330
1331         if (vq_is_packed(dev))
1332                 ret = vhost_enable_notify_packed(dev, vq, enable);
1333         else
1334                 ret = vhost_enable_notify_split(dev, vq, enable);
1335
1336         rte_spinlock_unlock(&vq->access_lock);
1337
1338         return ret;
1339 }
1340
1341 void
1342 rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
1343 {
1344         struct virtio_net *dev = get_device(vid);
1345
1346         if (dev == NULL)
1347                 return;
1348
1349         vhost_log_write(dev, addr, len);
1350 }
1351
1352 void
1353 rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
1354                          uint64_t offset, uint64_t len)
1355 {
1356         struct virtio_net *dev;
1357         struct vhost_virtqueue *vq;
1358
1359         dev = get_device(vid);
1360         if (dev == NULL)
1361                 return;
1362
1363         if (vring_idx >= VHOST_MAX_VRING)
1364                 return;
1365         vq = dev->virtqueue[vring_idx];
1366         if (!vq)
1367                 return;
1368
1369         vhost_log_used_vring(dev, vq, offset, len);
1370 }
1371
1372 uint32_t
1373 rte_vhost_rx_queue_count(int vid, uint16_t qid)
1374 {
1375         struct virtio_net *dev;
1376         struct vhost_virtqueue *vq;
1377         uint32_t ret = 0;
1378
1379         dev = get_device(vid);
1380         if (dev == NULL)
1381                 return 0;
1382
1383         if (unlikely(qid >= dev->nr_vring || (qid & 1) == 0)) {
1384                 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1385                         dev->vid, __func__, qid);
1386                 return 0;
1387         }
1388
1389         vq = dev->virtqueue[qid];
1390         if (vq == NULL)
1391                 return 0;
1392
1393         rte_spinlock_lock(&vq->access_lock);
1394
1395         if (unlikely(vq->enabled == 0 || vq->avail == NULL))
1396                 goto out;
1397
1398         ret = *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx;
1399
1400 out:
1401         rte_spinlock_unlock(&vq->access_lock);
1402         return ret;
1403 }
1404
1405 int rte_vhost_get_vdpa_device_id(int vid)
1406 {
1407         struct virtio_net *dev = get_device(vid);
1408
1409         if (dev == NULL)
1410                 return -1;
1411
1412         return dev->vdpa_dev_id;
1413 }
1414
1415 int rte_vhost_get_log_base(int vid, uint64_t *log_base,
1416                 uint64_t *log_size)
1417 {
1418         struct virtio_net *dev = get_device(vid);
1419
1420         if (dev == NULL || log_base == NULL || log_size == NULL)
1421                 return -1;
1422
1423         *log_base = dev->log_base;
1424         *log_size = dev->log_size;
1425
1426         return 0;
1427 }
1428
1429 int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
1430                 uint16_t *last_avail_idx, uint16_t *last_used_idx)
1431 {
1432         struct vhost_virtqueue *vq;
1433         struct virtio_net *dev = get_device(vid);
1434
1435         if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1436                 return -1;
1437
1438         vq = dev->virtqueue[queue_id];
1439         if (!vq)
1440                 return -1;
1441
1442         if (vq_is_packed(dev)) {
1443                 *last_avail_idx = (vq->avail_wrap_counter << 15) |
1444                                   vq->last_avail_idx;
1445                 *last_used_idx = (vq->used_wrap_counter << 15) |
1446                                  vq->last_used_idx;
1447         } else {
1448                 *last_avail_idx = vq->last_avail_idx;
1449                 *last_used_idx = vq->last_used_idx;
1450         }
1451
1452         return 0;
1453 }
1454
1455 int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
1456                 uint16_t last_avail_idx, uint16_t last_used_idx)
1457 {
1458         struct vhost_virtqueue *vq;
1459         struct virtio_net *dev = get_device(vid);
1460
1461         if (!dev)
1462                 return -1;
1463
1464         vq = dev->virtqueue[queue_id];
1465         if (!vq)
1466                 return -1;
1467
1468         if (vq_is_packed(dev)) {
1469                 vq->last_avail_idx = last_avail_idx & 0x7fff;
1470                 vq->avail_wrap_counter = !!(last_avail_idx & (1 << 15));
1471                 vq->last_used_idx = last_used_idx & 0x7fff;
1472                 vq->used_wrap_counter = !!(last_used_idx & (1 << 15));
1473         } else {
1474                 vq->last_avail_idx = last_avail_idx;
1475                 vq->last_used_idx = last_used_idx;
1476         }
1477
1478         return 0;
1479 }
1480
1481 int
1482 rte_vhost_get_vring_base_from_inflight(int vid,
1483                                        uint16_t queue_id,
1484                                        uint16_t *last_avail_idx,
1485                                        uint16_t *last_used_idx)
1486 {
1487         struct rte_vhost_inflight_info_packed *inflight_info;
1488         struct virtio_net *dev = get_device(vid);
1489
1490         if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1491                 return -1;
1492
1493         if (!vq_is_packed(dev))
1494                 return -1;
1495
1496         inflight_info = dev->virtqueue[queue_id]->inflight_packed;
1497         if (!inflight_info)
1498                 return -1;
1499
1500         *last_avail_idx = (inflight_info->old_used_wrap_counter << 15) |
1501                           inflight_info->old_used_idx;
1502         *last_used_idx = *last_avail_idx;
1503
1504         return 0;
1505 }
1506
1507 int rte_vhost_extern_callback_register(int vid,
1508                 struct rte_vhost_user_extern_ops const * const ops, void *ctx)
1509 {
1510         struct virtio_net *dev = get_device(vid);
1511
1512         if (dev == NULL || ops == NULL)
1513                 return -1;
1514
1515         dev->extern_ops = *ops;
1516         dev->extern_data = ctx;
1517         return 0;
1518 }
1519
1520 RTE_INIT(vhost_log_init)
1521 {
1522         vhost_config_log_level = rte_log_register("lib.vhost.config");
1523         if (vhost_config_log_level >= 0)
1524                 rte_log_set_level(vhost_config_log_level, RTE_LOG_INFO);
1525
1526         vhost_data_log_level = rte_log_register("lib.vhost.data");
1527         if (vhost_data_log_level >= 0)
1528                 rte_log_set_level(vhost_data_log_level, RTE_LOG_WARNING);
1529 }