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->postcopy_ufd = -1;
 637         rte_spinlock_init(&dev->slave_req_lock);
 638
 639         return i;
 640 }
 641
 642 void
 643 vhost_destroy_device_notify(struct virtio_net *dev)
 644 {
 645         struct rte_vdpa_device *vdpa_dev;
 646
 647         if (dev->flags & VIRTIO_DEV_RUNNING) {
 648                 vdpa_dev = dev->vdpa_dev;
 649                 if (vdpa_dev && vdpa_dev->ops->dev_close)
 650                         vdpa_dev->ops->dev_close(dev->vid);
 651                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 652                 dev->notify_ops->destroy_device(dev->vid);
 653         }
 654 }
 655
 656 /*
 657  * Invoked when there is the vhost-user connection is broken (when
 658  * the virtio device is being detached).
 659  */
 660 void
 661 vhost_destroy_device(int vid)
 662 {
 663         struct virtio_net *dev = get_device(vid);
 664
 665         if (dev == NULL)
 666                 return;
 667
 668         vhost_destroy_device_notify(dev);
 669
 670         cleanup_device(dev, 1);
 671         free_device(dev);
 672
 673         vhost_devices[vid] = NULL;
 674 }
 675
 676 void
 677 vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *vdpa_dev)
 678 {
 679         struct virtio_net *dev = get_device(vid);
 680
 681         if (dev == NULL)
 682                 return;
 683
 684         dev->vdpa_dev = vdpa_dev;
 685 }
 686
 687 void
 688 vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
 689 {
 690         struct virtio_net *dev;
 691         unsigned int len;
 692
 693         dev = get_device(vid);
 694         if (dev == NULL)
 695                 return;
 696
 697         len = if_len > sizeof(dev->ifname) ?
 698                 sizeof(dev->ifname) : if_len;
 699
 700         strncpy(dev->ifname, if_name, len);
 701         dev->ifname[sizeof(dev->ifname) - 1] = '\0';
 702 }
 703
 704 void
 705 vhost_enable_dequeue_zero_copy(int vid)
 706 {
 707         struct virtio_net *dev = get_device(vid);
 708
 709         if (dev == NULL)
 710                 return;
 711
 712         dev->dequeue_zero_copy = 1;
 713 }
 714
 715 void
 716 vhost_set_builtin_virtio_net(int vid, bool enable)
 717 {
 718         struct virtio_net *dev = get_device(vid);
 719
 720         if (dev == NULL)
 721                 return;
 722
 723         if (enable)
 724                 dev->flags |= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 725         else
 726                 dev->flags &= ~VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 727 }
 728
 729 void
 730 vhost_enable_extbuf(int vid)
 731 {
 732         struct virtio_net *dev = get_device(vid);
 733
 734         if (dev == NULL)
 735                 return;
 736
 737         dev->extbuf = 1;
 738 }
 739
 740 void
 741 vhost_enable_linearbuf(int vid)
 742 {
 743         struct virtio_net *dev = get_device(vid);
 744
 745         if (dev == NULL)
 746                 return;
 747
 748         dev->linearbuf = 1;
 749 }
 750
 751 int
 752 rte_vhost_get_mtu(int vid, uint16_t *mtu)
 753 {
 754         struct virtio_net *dev = get_device(vid);
 755
 756         if (dev == NULL || mtu == NULL)
 757                 return -ENODEV;
 758
 759         if (!(dev->flags & VIRTIO_DEV_READY))
 760                 return -EAGAIN;
 761
 762         if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
 763                 return -ENOTSUP;
 764
 765         *mtu = dev->mtu;
 766
 767         return 0;
 768 }
 769
 770 int
 771 rte_vhost_get_numa_node(int vid)
 772 {
 773 #ifdef RTE_LIBRTE_VHOST_NUMA
 774         struct virtio_net *dev = get_device(vid);
 775         int numa_node;
 776         int ret;
 777
 778         if (dev == NULL || numa_available() != 0)
 779                 return -1;
 780
 781         ret = get_mempolicy(&numa_node, NULL, 0, dev,
 782                             MPOL_F_NODE | MPOL_F_ADDR);
 783         if (ret < 0) {
 784                 VHOST_LOG_CONFIG(ERR,
 785                         "(%d) failed to query numa node: %s\n",
 786                         vid, rte_strerror(errno));
 787                 return -1;
 788         }
 789
 790         return numa_node;
 791 #else
 792         RTE_SET_USED(vid);
 793         return -1;
 794 #endif
 795 }
 796
 797 uint32_t
 798 rte_vhost_get_queue_num(int vid)
 799 {
 800         struct virtio_net *dev = get_device(vid);
 801
 802         if (dev == NULL)
 803                 return 0;
 804
 805         return dev->nr_vring / 2;
 806 }
 807
 808 uint16_t
 809 rte_vhost_get_vring_num(int vid)
 810 {
 811         struct virtio_net *dev = get_device(vid);
 812
 813         if (dev == NULL)
 814                 return 0;
 815
 816         return dev->nr_vring;
 817 }
 818
 819 int
 820 rte_vhost_get_ifname(int vid, char *buf, size_t len)
 821 {
 822         struct virtio_net *dev = get_device(vid);
 823
 824         if (dev == NULL || buf == NULL)
 825                 return -1;
 826
 827         len = RTE_MIN(len, sizeof(dev->ifname));
 828
 829         strncpy(buf, dev->ifname, len);
 830         buf[len - 1] = '\0';
 831
 832         return 0;
 833 }
 834
 835 int
 836 rte_vhost_get_negotiated_features(int vid, uint64_t *features)
 837 {
 838         struct virtio_net *dev;
 839
 840         dev = get_device(vid);
 841         if (dev == NULL || features == NULL)
 842                 return -1;
 843
 844         *features = dev->features;
 845         return 0;
 846 }
 847
 848 int
 849 rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
 850 {
 851         struct virtio_net *dev;
 852         struct rte_vhost_memory *m;
 853         size_t size;
 854
 855         dev = get_device(vid);
 856         if (dev == NULL || mem == NULL)
 857                 return -1;
 858
 859         size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
 860         m = malloc(sizeof(struct rte_vhost_memory) + size);
 861         if (!m)
 862                 return -1;
 863
 864         m->nregions = dev->mem->nregions;
 865         memcpy(m->regions, dev->mem->regions, size);
 866         *mem = m;
 867
 868         return 0;
 869 }
 870
 871 int
 872 rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
 873                           struct rte_vhost_vring *vring)
 874 {
 875         struct virtio_net *dev;
 876         struct vhost_virtqueue *vq;
 877
 878         dev = get_device(vid);
 879         if (dev == NULL || vring == NULL)
 880                 return -1;
 881
 882         if (vring_idx >= VHOST_MAX_VRING)
 883                 return -1;
 884
 885         vq = dev->virtqueue[vring_idx];
 886         if (!vq)
 887                 return -1;
 888
 889         if (vq_is_packed(dev)) {
 890                 vring->desc_packed = vq->desc_packed;
 891                 vring->driver_event = vq->driver_event;
 892                 vring->device_event = vq->device_event;
 893         } else {
 894                 vring->desc = vq->desc;
 895                 vring->avail = vq->avail;
 896                 vring->used = vq->used;
 897         }
 898         vring->log_guest_addr  = vq->log_guest_addr;
 899
 900         vring->callfd  = vq->callfd;
 901         vring->kickfd  = vq->kickfd;
 902         vring->size    = vq->size;
 903
 904         return 0;
 905 }
 906
 907 int
 908 rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
 909                                   struct rte_vhost_ring_inflight *vring)
 910 {
 911         struct virtio_net *dev;
 912         struct vhost_virtqueue *vq;
 913
 914         dev = get_device(vid);
 915         if (unlikely(!dev))
 916                 return -1;
 917
 918         if (vring_idx >= VHOST_MAX_VRING)
 919                 return -1;
 920
 921         vq = dev->virtqueue[vring_idx];
 922         if (unlikely(!vq))
 923                 return -1;
 924
 925         if (vq_is_packed(dev)) {
 926                 if (unlikely(!vq->inflight_packed))
 927                         return -1;
 928
 929                 vring->inflight_packed = vq->inflight_packed;
 930         } else {
 931                 if (unlikely(!vq->inflight_split))
 932                         return -1;
 933
 934                 vring->inflight_split = vq->inflight_split;
 935         }
 936
 937         vring->resubmit_inflight = vq->resubmit_inflight;
 938
 939         return 0;
 940 }
 941
 942 int
 943 rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
 944                                   uint16_t idx)
 945 {
 946         struct vhost_virtqueue *vq;
 947         struct virtio_net *dev;
 948
 949         dev = get_device(vid);
 950         if (unlikely(!dev))
 951                 return -1;
 952
 953         if (unlikely(!(dev->protocol_features &
 954             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
 955                 return 0;
 956
 957         if (unlikely(vq_is_packed(dev)))
 958                 return -1;
 959
 960         if (unlikely(vring_idx >= VHOST_MAX_VRING))
 961                 return -1;
 962
 963         vq = dev->virtqueue[vring_idx];
 964         if (unlikely(!vq))
 965                 return -1;
 966
 967         if (unlikely(!vq->inflight_split))
 968                 return -1;
 969
 970         if (unlikely(idx >= vq->size))
 971                 return -1;
 972
 973         vq->inflight_split->desc[idx].counter = vq->global_counter++;
 974         vq->inflight_split->desc[idx].inflight = 1;
 975         return 0;
 976 }
 977
 978 int
 979 rte_vhost_set_inflight_desc_packed(int vid, uint16_t vring_idx,
 980                                    uint16_t head, uint16_t last,
 981                                    uint16_t *inflight_entry)
 982 {
 983         struct rte_vhost_inflight_info_packed *inflight_info;
 984         struct virtio_net *dev;
 985         struct vhost_virtqueue *vq;
 986         struct vring_packed_desc *desc;
 987         uint16_t old_free_head, free_head;
 988
 989         dev = get_device(vid);
 990         if (unlikely(!dev))
 991                 return -1;
 992
 993         if (unlikely(!(dev->protocol_features &
 994             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
 995                 return 0;
 996
 997         if (unlikely(!vq_is_packed(dev)))
 998                 return -1;
 999
1000         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1001                 return -1;
1002
1003         vq = dev->virtqueue[vring_idx];
1004         if (unlikely(!vq))
1005                 return -1;
1006
1007         inflight_info = vq->inflight_packed;
1008         if (unlikely(!inflight_info))
1009                 return -1;
1010
1011         if (unlikely(head >= vq->size))
1012                 return -1;
1013
1014         desc = vq->desc_packed;
1015         old_free_head = inflight_info->old_free_head;
1016         if (unlikely(old_free_head >= vq->size))
1017                 return -1;
1018
1019         free_head = old_free_head;
1020
1021         /* init header descriptor */
1022         inflight_info->desc[old_free_head].num = 0;
1023         inflight_info->desc[old_free_head].counter = vq->global_counter++;
1024         inflight_info->desc[old_free_head].inflight = 1;
1025
1026         /* save desc entry in flight entry */
1027         while (head != ((last + 1) % vq->size)) {
1028                 inflight_info->desc[old_free_head].num++;
1029                 inflight_info->desc[free_head].addr = desc[head].addr;
1030                 inflight_info->desc[free_head].len = desc[head].len;
1031                 inflight_info->desc[free_head].flags = desc[head].flags;
1032                 inflight_info->desc[free_head].id = desc[head].id;
1033
1034                 inflight_info->desc[old_free_head].last = free_head;
1035                 free_head = inflight_info->desc[free_head].next;
1036                 inflight_info->free_head = free_head;
1037                 head = (head + 1) % vq->size;
1038         }
1039
1040         inflight_info->old_free_head = free_head;
1041         *inflight_entry = old_free_head;
1042
1043         return 0;
1044 }
1045
1046 int
1047 rte_vhost_clr_inflight_desc_split(int vid, uint16_t vring_idx,
1048                                   uint16_t last_used_idx, uint16_t idx)
1049 {
1050         struct virtio_net *dev;
1051         struct vhost_virtqueue *vq;
1052
1053         dev = get_device(vid);
1054         if (unlikely(!dev))
1055                 return -1;
1056
1057         if (unlikely(!(dev->protocol_features &
1058             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1059                 return 0;
1060
1061         if (unlikely(vq_is_packed(dev)))
1062                 return -1;
1063
1064         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1065                 return -1;
1066
1067         vq = dev->virtqueue[vring_idx];
1068         if (unlikely(!vq))
1069                 return -1;
1070
1071         if (unlikely(!vq->inflight_split))
1072                 return -1;
1073
1074         if (unlikely(idx >= vq->size))
1075                 return -1;
1076
1077         rte_smp_mb();
1078
1079         vq->inflight_split->desc[idx].inflight = 0;
1080
1081         rte_smp_mb();
1082
1083         vq->inflight_split->used_idx = last_used_idx;
1084         return 0;
1085 }
1086
1087 int
1088 rte_vhost_clr_inflight_desc_packed(int vid, uint16_t vring_idx,
1089                                    uint16_t head)
1090 {
1091         struct rte_vhost_inflight_info_packed *inflight_info;
1092         struct virtio_net *dev;
1093         struct vhost_virtqueue *vq;
1094
1095         dev = get_device(vid);
1096         if (unlikely(!dev))
1097                 return -1;
1098
1099         if (unlikely(!(dev->protocol_features &
1100             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1101                 return 0;
1102
1103         if (unlikely(!vq_is_packed(dev)))
1104                 return -1;
1105
1106         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1107                 return -1;
1108
1109         vq = dev->virtqueue[vring_idx];
1110         if (unlikely(!vq))
1111                 return -1;
1112
1113         inflight_info = vq->inflight_packed;
1114         if (unlikely(!inflight_info))
1115                 return -1;
1116
1117         if (unlikely(head >= vq->size))
1118                 return -1;
1119
1120         rte_smp_mb();
1121
1122         inflight_info->desc[head].inflight = 0;
1123
1124         rte_smp_mb();
1125
1126         inflight_info->old_free_head = inflight_info->free_head;
1127         inflight_info->old_used_idx = inflight_info->used_idx;
1128         inflight_info->old_used_wrap_counter = inflight_info->used_wrap_counter;
1129
1130         return 0;
1131 }
1132
1133 int
1134 rte_vhost_set_last_inflight_io_split(int vid, uint16_t vring_idx,
1135                                      uint16_t idx)
1136 {
1137         struct virtio_net *dev;
1138         struct vhost_virtqueue *vq;
1139
1140         dev = get_device(vid);
1141         if (unlikely(!dev))
1142                 return -1;
1143
1144         if (unlikely(!(dev->protocol_features &
1145             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1146                 return 0;
1147
1148         if (unlikely(vq_is_packed(dev)))
1149                 return -1;
1150
1151         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1152                 return -1;
1153
1154         vq = dev->virtqueue[vring_idx];
1155         if (unlikely(!vq))
1156                 return -1;
1157
1158         if (unlikely(!vq->inflight_split))
1159                 return -1;
1160
1161         vq->inflight_split->last_inflight_io = idx;
1162         return 0;
1163 }
1164
1165 int
1166 rte_vhost_set_last_inflight_io_packed(int vid, uint16_t vring_idx,
1167                                       uint16_t head)
1168 {
1169         struct rte_vhost_inflight_info_packed *inflight_info;
1170         struct virtio_net *dev;
1171         struct vhost_virtqueue *vq;
1172         uint16_t last;
1173
1174         dev = get_device(vid);
1175         if (unlikely(!dev))
1176                 return -1;
1177
1178         if (unlikely(!(dev->protocol_features &
1179             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1180                 return 0;
1181
1182         if (unlikely(!vq_is_packed(dev)))
1183                 return -1;
1184
1185         if (unlikely(vring_idx >= VHOST_MAX_VRING))
1186                 return -1;
1187
1188         vq = dev->virtqueue[vring_idx];
1189         if (unlikely(!vq))
1190                 return -1;
1191
1192         inflight_info = vq->inflight_packed;
1193         if (unlikely(!inflight_info))
1194                 return -1;
1195
1196         if (unlikely(head >= vq->size))
1197                 return -1;
1198
1199         last = inflight_info->desc[head].last;
1200         if (unlikely(last >= vq->size))
1201                 return -1;
1202
1203         inflight_info->desc[last].next = inflight_info->free_head;
1204         inflight_info->free_head = head;
1205         inflight_info->used_idx += inflight_info->desc[head].num;
1206         if (inflight_info->used_idx >= inflight_info->desc_num) {
1207                 inflight_info->used_idx -= inflight_info->desc_num;
1208                 inflight_info->used_wrap_counter =
1209                         !inflight_info->used_wrap_counter;
1210         }
1211
1212         return 0;
1213 }
1214
1215 int
1216 rte_vhost_vring_call(int vid, uint16_t vring_idx)
1217 {
1218         struct virtio_net *dev;
1219         struct vhost_virtqueue *vq;
1220
1221         dev = get_device(vid);
1222         if (!dev)
1223                 return -1;
1224
1225         if (vring_idx >= VHOST_MAX_VRING)
1226                 return -1;
1227
1228         vq = dev->virtqueue[vring_idx];
1229         if (!vq)
1230                 return -1;
1231
1232         if (vq_is_packed(dev))
1233                 vhost_vring_call_packed(dev, vq);
1234         else
1235                 vhost_vring_call_split(dev, vq);
1236
1237         return 0;
1238 }
1239
1240 uint16_t
1241 rte_vhost_avail_entries(int vid, uint16_t queue_id)
1242 {
1243         struct virtio_net *dev;
1244         struct vhost_virtqueue *vq;
1245         uint16_t ret = 0;
1246
1247         dev = get_device(vid);
1248         if (!dev)
1249                 return 0;
1250
1251         vq = dev->virtqueue[queue_id];
1252
1253         rte_spinlock_lock(&vq->access_lock);
1254
1255         if (unlikely(!vq->enabled || vq->avail == NULL))
1256                 goto out;
1257
1258         ret = *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
1259
1260 out:
1261         rte_spinlock_unlock(&vq->access_lock);
1262         return ret;
1263 }
1264
1265 static inline int
1266 vhost_enable_notify_split(struct virtio_net *dev,
1267                 struct vhost_virtqueue *vq, int enable)
1268 {
1269         if (vq->used == NULL)
1270                 return -1;
1271
1272         if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
1273                 if (enable)
1274                         vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
1275                 else
1276                         vq->used->flags |= VRING_USED_F_NO_NOTIFY;
1277         } else {
1278                 if (enable)
1279                         vhost_avail_event(vq) = vq->last_avail_idx;
1280         }
1281         return 0;
1282 }
1283
1284 static inline int
1285 vhost_enable_notify_packed(struct virtio_net *dev,
1286                 struct vhost_virtqueue *vq, int enable)
1287 {
1288         uint16_t flags;
1289
1290         if (vq->device_event == NULL)
1291                 return -1;
1292
1293         if (!enable) {
1294                 vq->device_event->flags = VRING_EVENT_F_DISABLE;
1295                 return 0;
1296         }
1297
1298         flags = VRING_EVENT_F_ENABLE;
1299         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
1300                 flags = VRING_EVENT_F_DESC;
1301                 vq->device_event->off_wrap = vq->last_avail_idx |
1302                         vq->avail_wrap_counter << 15;
1303         }
1304
1305         rte_smp_wmb();
1306
1307         vq->device_event->flags = flags;
1308         return 0;
1309 }
1310
1311 int
1312 rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
1313 {
1314         struct virtio_net *dev = get_device(vid);
1315         struct vhost_virtqueue *vq;
1316         int ret;
1317
1318         if (!dev)
1319                 return -1;
1320
1321         vq = dev->virtqueue[queue_id];
1322
1323         rte_spinlock_lock(&vq->access_lock);
1324
1325         if (vq_is_packed(dev))
1326                 ret = vhost_enable_notify_packed(dev, vq, enable);
1327         else
1328                 ret = vhost_enable_notify_split(dev, vq, enable);
1329
1330         rte_spinlock_unlock(&vq->access_lock);
1331
1332         return ret;
1333 }
1334
1335 void
1336 rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
1337 {
1338         struct virtio_net *dev = get_device(vid);
1339
1340         if (dev == NULL)
1341                 return;
1342
1343         vhost_log_write(dev, addr, len);
1344 }
1345
1346 void
1347 rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
1348                          uint64_t offset, uint64_t len)
1349 {
1350         struct virtio_net *dev;
1351         struct vhost_virtqueue *vq;
1352
1353         dev = get_device(vid);
1354         if (dev == NULL)
1355                 return;
1356
1357         if (vring_idx >= VHOST_MAX_VRING)
1358                 return;
1359         vq = dev->virtqueue[vring_idx];
1360         if (!vq)
1361                 return;
1362
1363         vhost_log_used_vring(dev, vq, offset, len);
1364 }
1365
1366 uint32_t
1367 rte_vhost_rx_queue_count(int vid, uint16_t qid)
1368 {
1369         struct virtio_net *dev;
1370         struct vhost_virtqueue *vq;
1371         uint32_t ret = 0;
1372
1373         dev = get_device(vid);
1374         if (dev == NULL)
1375                 return 0;
1376
1377         if (unlikely(qid >= dev->nr_vring || (qid & 1) == 0)) {
1378                 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1379                         dev->vid, __func__, qid);
1380                 return 0;
1381         }
1382
1383         vq = dev->virtqueue[qid];
1384         if (vq == NULL)
1385                 return 0;
1386
1387         rte_spinlock_lock(&vq->access_lock);
1388
1389         if (unlikely(vq->enabled == 0 || vq->avail == NULL))
1390                 goto out;
1391
1392         ret = *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx;
1393
1394 out:
1395         rte_spinlock_unlock(&vq->access_lock);
1396         return ret;
1397 }
1398
1399 struct rte_vdpa_device *
1400 rte_vhost_get_vdpa_device(int vid)
1401 {
1402         struct virtio_net *dev = get_device(vid);
1403
1404         if (dev == NULL)
1405                 return NULL;
1406
1407         return dev->vdpa_dev;
1408 }
1409
1410 int rte_vhost_get_log_base(int vid, uint64_t *log_base,
1411                 uint64_t *log_size)
1412 {
1413         struct virtio_net *dev = get_device(vid);
1414
1415         if (dev == NULL || log_base == NULL || log_size == NULL)
1416                 return -1;
1417
1418         *log_base = dev->log_base;
1419         *log_size = dev->log_size;
1420
1421         return 0;
1422 }
1423
1424 int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
1425                 uint16_t *last_avail_idx, uint16_t *last_used_idx)
1426 {
1427         struct vhost_virtqueue *vq;
1428         struct virtio_net *dev = get_device(vid);
1429
1430         if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1431                 return -1;
1432
1433         vq = dev->virtqueue[queue_id];
1434         if (!vq)
1435                 return -1;
1436
1437         if (vq_is_packed(dev)) {
1438                 *last_avail_idx = (vq->avail_wrap_counter << 15) |
1439                                   vq->last_avail_idx;
1440                 *last_used_idx = (vq->used_wrap_counter << 15) |
1441                                  vq->last_used_idx;
1442         } else {
1443                 *last_avail_idx = vq->last_avail_idx;
1444                 *last_used_idx = vq->last_used_idx;
1445         }
1446
1447         return 0;
1448 }
1449
1450 int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
1451                 uint16_t last_avail_idx, uint16_t last_used_idx)
1452 {
1453         struct vhost_virtqueue *vq;
1454         struct virtio_net *dev = get_device(vid);
1455
1456         if (!dev)
1457                 return -1;
1458
1459         vq = dev->virtqueue[queue_id];
1460         if (!vq)
1461                 return -1;
1462
1463         if (vq_is_packed(dev)) {
1464                 vq->last_avail_idx = last_avail_idx & 0x7fff;
1465                 vq->avail_wrap_counter = !!(last_avail_idx & (1 << 15));
1466                 vq->last_used_idx = last_used_idx & 0x7fff;
1467                 vq->used_wrap_counter = !!(last_used_idx & (1 << 15));
1468         } else {
1469                 vq->last_avail_idx = last_avail_idx;
1470                 vq->last_used_idx = last_used_idx;
1471         }
1472
1473         return 0;
1474 }
1475
1476 int
1477 rte_vhost_get_vring_base_from_inflight(int vid,
1478                                        uint16_t queue_id,
1479                                        uint16_t *last_avail_idx,
1480                                        uint16_t *last_used_idx)
1481 {
1482         struct rte_vhost_inflight_info_packed *inflight_info;
1483         struct virtio_net *dev = get_device(vid);
1484
1485         if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1486                 return -1;
1487
1488         if (!vq_is_packed(dev))
1489                 return -1;
1490
1491         inflight_info = dev->virtqueue[queue_id]->inflight_packed;
1492         if (!inflight_info)
1493                 return -1;
1494
1495         *last_avail_idx = (inflight_info->old_used_wrap_counter << 15) |
1496                           inflight_info->old_used_idx;
1497         *last_used_idx = *last_avail_idx;
1498
1499         return 0;
1500 }
1501
1502 int rte_vhost_extern_callback_register(int vid,
1503                 struct rte_vhost_user_extern_ops const * const ops, void *ctx)
1504 {
1505         struct virtio_net *dev = get_device(vid);
1506
1507         if (dev == NULL || ops == NULL)
1508                 return -1;
1509
1510         dev->extern_ops = *ops;
1511         dev->extern_data = ctx;
1512         return 0;
1513 }
1514
1515 RTE_INIT(vhost_log_init)
1516 {
1517         vhost_config_log_level = rte_log_register("lib.vhost.config");
1518         if (vhost_config_log_level >= 0)
1519                 rte_log_set_level(vhost_config_log_level, RTE_LOG_INFO);
1520
1521         vhost_data_log_level = rte_log_register("lib.vhost.data");
1522         if (vhost_data_log_level >= 0)
1523                 rte_log_set_level(vhost_data_log_level, RTE_LOG_WARNING);
1524 }