lib/librte_vhost/vhost.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2017 Intel Corporation
   3  */
   4
   5 #include <linux/vhost.h>
   6 #include <linux/virtio_net.h>
   7 #include <stddef.h>
   8 #include <stdint.h>
   9 #include <stdlib.h>
  10 #ifdef RTE_LIBRTE_VHOST_NUMA
  11 #include <numa.h>
  12 #include <numaif.h>
  13 #endif
  14
  15 #include <rte_errno.h>
  16 #include <rte_ethdev.h>
  17 #include <rte_log.h>
  18 #include <rte_string_fns.h>
  19 #include <rte_memory.h>
  20 #include <rte_malloc.h>
  21 #include <rte_vhost.h>
  22 #include <rte_rwlock.h>
  23
  24 #include "iotlb.h"
  25 #include "vhost.h"
  26 #include "vhost_user.h"
  27
  28 struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
  29
  30 /* Called with iotlb_lock read-locked */
  31 uint64_t
  32 __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
  33                     uint64_t iova, uint64_t *size, uint8_t perm)
  34 {
  35         uint64_t vva, tmp_size;
  36
  37         if (unlikely(!*size))
  38                 return 0;
  39
  40         tmp_size = *size;
  41
  42         vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
  43         if (tmp_size == *size)
  44                 return vva;
  45
  46         iova += tmp_size;
  47
  48         if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
  49                 /*
  50                  * iotlb_lock is read-locked for a full burst,
  51                  * but it only protects the iotlb cache.
  52                  * In case of IOTLB miss, we might block on the socket,
  53                  * which could cause a deadlock with QEMU if an IOTLB update
  54                  * is being handled. We can safely unlock here to avoid it.
  55                  */
  56                 vhost_user_iotlb_rd_unlock(vq);
  57
  58                 vhost_user_iotlb_pending_insert(vq, iova, perm);
  59                 if (vhost_user_iotlb_miss(dev, iova, perm)) {
  60                         RTE_LOG(ERR, VHOST_CONFIG,
  61                                 "IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
  62                                 iova);
  63                         vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
  64                 }
  65
  66                 vhost_user_iotlb_rd_lock(vq);
  67         }
  68
  69         return 0;
  70 }
  71
  72 #define VHOST_LOG_PAGE  4096
  73
  74 /*
  75  * Atomically set a bit in memory.
  76  */
  77 static __rte_always_inline void
  78 vhost_set_bit(unsigned int nr, volatile uint8_t *addr)
  79 {
  80 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
  81         /*
  82          * __sync_ built-ins are deprecated, but __atomic_ ones
  83          * are sub-optimized in older GCC versions.
  84          */
  85         __sync_fetch_and_or_1(addr, (1U << nr));
  86 #else
  87         __atomic_fetch_or(addr, (1U << nr), __ATOMIC_RELAXED);
  88 #endif
  89 }
  90
  91 static __rte_always_inline void
  92 vhost_log_page(uint8_t *log_base, uint64_t page)
  93 {
  94         vhost_set_bit(page % 8, &log_base[page / 8]);
  95 }
  96
  97 void
  98 __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
  99 {
 100         uint64_t page;
 101
 102         if (unlikely(!dev->log_base || !len))
 103                 return;
 104
 105         if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
 106                 return;
 107
 108         /* To make sure guest memory updates are committed before logging */
 109         rte_smp_wmb();
 110
 111         page = addr / VHOST_LOG_PAGE;
 112         while (page * VHOST_LOG_PAGE < addr + len) {
 113                 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
 114                 page += 1;
 115         }
 116 }
 117
 118 void
 119 __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
 120                              uint64_t iova, uint64_t len)
 121 {
 122         uint64_t hva, gpa, map_len;
 123         map_len = len;
 124
 125         hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
 126         if (map_len != len) {
 127                 RTE_LOG(ERR, VHOST_CONFIG,
 128                         "Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
 129                         iova);
 130                 return;
 131         }
 132
 133         gpa = hva_to_gpa(dev, hva, len);
 134         if (gpa)
 135                 __vhost_log_write(dev, gpa, len);
 136 }
 137
 138 void
 139 __vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
 140 {
 141         unsigned long *log_base;
 142         int i;
 143
 144         if (unlikely(!dev->log_base))
 145                 return;
 146
 147         rte_smp_wmb();
 148
 149         log_base = (unsigned long *)(uintptr_t)dev->log_base;
 150
 151         for (i = 0; i < vq->log_cache_nb_elem; i++) {
 152                 struct log_cache_entry *elem = vq->log_cache + i;
 153
 154 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
 155                 /*
 156                  * '__sync' builtins are deprecated, but '__atomic' ones
 157                  * are sub-optimized in older GCC versions.
 158                  */
 159                 __sync_fetch_and_or(log_base + elem->offset, elem->val);
 160 #else
 161                 __atomic_fetch_or(log_base + elem->offset, elem->val,
 162                                 __ATOMIC_RELAXED);
 163 #endif
 164         }
 165
 166         rte_smp_wmb();
 167
 168         vq->log_cache_nb_elem = 0;
 169 }
 170
 171 static __rte_always_inline void
 172 vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq,
 173                         uint64_t page)
 174 {
 175         uint32_t bit_nr = page % (sizeof(unsigned long) << 3);
 176         uint32_t offset = page / (sizeof(unsigned long) << 3);
 177         int i;
 178
 179         for (i = 0; i < vq->log_cache_nb_elem; i++) {
 180                 struct log_cache_entry *elem = vq->log_cache + i;
 181
 182                 if (elem->offset == offset) {
 183                         elem->val |= (1UL << bit_nr);
 184                         return;
 185                 }
 186         }
 187
 188         if (unlikely(i >= VHOST_LOG_CACHE_NR)) {
 189                 /*
 190                  * No more room for a new log cache entry,
 191                  * so write the dirty log map directly.
 192                  */
 193                 rte_smp_wmb();
 194                 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
 195
 196                 return;
 197         }
 198
 199         vq->log_cache[i].offset = offset;
 200         vq->log_cache[i].val = (1UL << bit_nr);
 201         vq->log_cache_nb_elem++;
 202 }
 203
 204 void
 205 __vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
 206                         uint64_t addr, uint64_t len)
 207 {
 208         uint64_t page;
 209
 210         if (unlikely(!dev->log_base || !len))
 211                 return;
 212
 213         if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
 214                 return;
 215
 216         page = addr / VHOST_LOG_PAGE;
 217         while (page * VHOST_LOG_PAGE < addr + len) {
 218                 vhost_log_cache_page(dev, vq, page);
 219                 page += 1;
 220         }
 221 }
 222
 223 void
 224 __vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
 225                              uint64_t iova, uint64_t len)
 226 {
 227         uint64_t hva, gpa, map_len;
 228         map_len = len;
 229
 230         hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
 231         if (map_len != len) {
 232                 RTE_LOG(ERR, VHOST_CONFIG,
 233                         "Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
 234                         iova);
 235                 return;
 236         }
 237
 238         gpa = hva_to_gpa(dev, hva, len);
 239         if (gpa)
 240                 __vhost_log_cache_write(dev, vq, gpa, len);
 241 }
 242
 243 void *
 244 vhost_alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
 245                 uint64_t desc_addr, uint64_t desc_len)
 246 {
 247         void *idesc;
 248         uint64_t src, dst;
 249         uint64_t len, remain = desc_len;
 250
 251         idesc = rte_malloc(__func__, desc_len, 0);
 252         if (unlikely(!idesc))
 253                 return NULL;
 254
 255         dst = (uint64_t)(uintptr_t)idesc;
 256
 257         while (remain) {
 258                 len = remain;
 259                 src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
 260                                 VHOST_ACCESS_RO);
 261                 if (unlikely(!src || !len)) {
 262                         rte_free(idesc);
 263                         return NULL;
 264                 }
 265
 266                 rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
 267
 268                 remain -= len;
 269                 dst += len;
 270                 desc_addr += len;
 271         }
 272
 273         return idesc;
 274 }
 275
 276 void
 277 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
 278 {
 279         if ((vq->callfd >= 0) && (destroy != 0))
 280                 close(vq->callfd);
 281         if (vq->kickfd >= 0)
 282                 close(vq->kickfd);
 283 }
 284
 285 void
 286 cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq)
 287 {
 288         if (!(dev->protocol_features &
 289             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
 290                 return;
 291
 292         if (vq_is_packed(dev)) {
 293                 if (vq->inflight_packed)
 294                         vq->inflight_packed = NULL;
 295         } else {
 296                 if (vq->inflight_split)
 297                         vq->inflight_split = NULL;
 298         }
 299
 300         if (vq->resubmit_inflight) {
 301                 if (vq->resubmit_inflight->resubmit_list) {
 302                         free(vq->resubmit_inflight->resubmit_list);
 303                         vq->resubmit_inflight->resubmit_list = NULL;
 304                 }
 305                 free(vq->resubmit_inflight);
 306                 vq->resubmit_inflight = NULL;
 307         }
 308 }
 309
 310 /*
 311  * Unmap any memory, close any file descriptors and
 312  * free any memory owned by a device.
 313  */
 314 void
 315 cleanup_device(struct virtio_net *dev, int destroy)
 316 {
 317         uint32_t i;
 318
 319         vhost_backend_cleanup(dev);
 320
 321         for (i = 0; i < dev->nr_vring; i++) {
 322                 cleanup_vq(dev->virtqueue[i], destroy);
 323                 cleanup_vq_inflight(dev, dev->virtqueue[i]);
 324         }
 325 }
 326
 327 void
 328 free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq)
 329 {
 330         if (vq_is_packed(dev))
 331                 rte_free(vq->shadow_used_packed);
 332         else
 333                 rte_free(vq->shadow_used_split);
 334         rte_free(vq->batch_copy_elems);
 335         rte_mempool_free(vq->iotlb_pool);
 336         rte_free(vq);
 337 }
 338
 339 /*
 340  * Release virtqueues and device memory.
 341  */
 342 static void
 343 free_device(struct virtio_net *dev)
 344 {
 345         uint32_t i;
 346
 347         for (i = 0; i < dev->nr_vring; i++)
 348                 free_vq(dev, dev->virtqueue[i]);
 349
 350         rte_free(dev);
 351 }
 352
 353 static int
 354 vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
 355 {
 356         uint64_t req_size, size;
 357
 358         req_size = sizeof(struct vring_desc) * vq->size;
 359         size = req_size;
 360         vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 361                                                 vq->ring_addrs.desc_user_addr,
 362                                                 &size, VHOST_ACCESS_RW);
 363         if (!vq->desc || size != req_size)
 364                 return -1;
 365
 366         req_size = sizeof(struct vring_avail);
 367         req_size += sizeof(uint16_t) * vq->size;
 368         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 369                 req_size += sizeof(uint16_t);
 370         size = req_size;
 371         vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 372                                                 vq->ring_addrs.avail_user_addr,
 373                                                 &size, VHOST_ACCESS_RW);
 374         if (!vq->avail || size != req_size)
 375                 return -1;
 376
 377         req_size = sizeof(struct vring_used);
 378         req_size += sizeof(struct vring_used_elem) * vq->size;
 379         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 380                 req_size += sizeof(uint16_t);
 381         size = req_size;
 382         vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
 383                                                 vq->ring_addrs.used_user_addr,
 384                                                 &size, VHOST_ACCESS_RW);
 385         if (!vq->used || size != req_size)
 386                 return -1;
 387
 388         return 0;
 389 }
 390
 391 static int
 392 vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
 393 {
 394         uint64_t req_size, size;
 395
 396         req_size = sizeof(struct vring_packed_desc) * vq->size;
 397         size = req_size;
 398         vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 399                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.desc_user_addr,
 400                                 &size, VHOST_ACCESS_RW);
 401         if (!vq->desc_packed || size != req_size)
 402                 return -1;
 403
 404         req_size = sizeof(struct vring_packed_desc_event);
 405         size = req_size;
 406         vq->driver_event = (struct vring_packed_desc_event *)(uintptr_t)
 407                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.avail_user_addr,
 408                                 &size, VHOST_ACCESS_RW);
 409         if (!vq->driver_event || size != req_size)
 410                 return -1;
 411
 412         req_size = sizeof(struct vring_packed_desc_event);
 413         size = req_size;
 414         vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
 415                 vhost_iova_to_vva(dev, vq, vq->ring_addrs.used_user_addr,
 416                                 &size, VHOST_ACCESS_RW);
 417         if (!vq->device_event || size != req_size)
 418                 return -1;
 419
 420         return 0;
 421 }
 422
 423 int
 424 vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 425 {
 426
 427         if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
 428                 return -1;
 429
 430         if (vq_is_packed(dev)) {
 431                 if (vring_translate_packed(dev, vq) < 0)
 432                         return -1;
 433         } else {
 434                 if (vring_translate_split(dev, vq) < 0)
 435                         return -1;
 436         }
 437         vq->access_ok = 1;
 438
 439         return 0;
 440 }
 441
 442 void
 443 vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
 444 {
 445         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 446                 vhost_user_iotlb_wr_lock(vq);
 447
 448         vq->access_ok = 0;
 449         vq->desc = NULL;
 450         vq->avail = NULL;
 451         vq->used = NULL;
 452         vq->log_guest_addr = 0;
 453
 454         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 455                 vhost_user_iotlb_wr_unlock(vq);
 456 }
 457
 458 static void
 459 init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 460 {
 461         struct vhost_virtqueue *vq;
 462
 463         if (vring_idx >= VHOST_MAX_VRING) {
 464                 RTE_LOG(ERR, VHOST_CONFIG,
 465                                 "Failed not init vring, out of bound (%d)\n",
 466                                 vring_idx);
 467                 return;
 468         }
 469
 470         vq = dev->virtqueue[vring_idx];
 471
 472         memset(vq, 0, sizeof(struct vhost_virtqueue));
 473
 474         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 475         vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
 476
 477         vhost_user_iotlb_init(dev, vring_idx);
 478         /* Backends are set to -1 indicating an inactive device. */
 479         vq->backend = -1;
 480
 481         TAILQ_INIT(&vq->zmbuf_list);
 482 }
 483
 484 static void
 485 reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 486 {
 487         struct vhost_virtqueue *vq;
 488         int callfd;
 489
 490         if (vring_idx >= VHOST_MAX_VRING) {
 491                 RTE_LOG(ERR, VHOST_CONFIG,
 492                                 "Failed not init vring, out of bound (%d)\n",
 493                                 vring_idx);
 494                 return;
 495         }
 496
 497         vq = dev->virtqueue[vring_idx];
 498         callfd = vq->callfd;
 499         init_vring_queue(dev, vring_idx);
 500         vq->callfd = callfd;
 501 }
 502
 503 int
 504 alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 505 {
 506         struct vhost_virtqueue *vq;
 507
 508         vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
 509         if (vq == NULL) {
 510                 RTE_LOG(ERR, VHOST_CONFIG,
 511                         "Failed to allocate memory for vring:%u.\n", vring_idx);
 512                 return -1;
 513         }
 514
 515         dev->virtqueue[vring_idx] = vq;
 516         init_vring_queue(dev, vring_idx);
 517         rte_spinlock_init(&vq->access_lock);
 518         vq->avail_wrap_counter = 1;
 519         vq->used_wrap_counter = 1;
 520         vq->signalled_used_valid = false;
 521
 522         dev->nr_vring += 1;
 523
 524         return 0;
 525 }
 526
 527 /*
 528  * Reset some variables in device structure, while keeping few
 529  * others untouched, such as vid, ifname, nr_vring: they
 530  * should be same unless the device is removed.
 531  */
 532 void
 533 reset_device(struct virtio_net *dev)
 534 {
 535         uint32_t i;
 536
 537         dev->features = 0;
 538         dev->protocol_features = 0;
 539         dev->flags &= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 540
 541         for (i = 0; i < dev->nr_vring; i++)
 542                 reset_vring_queue(dev, i);
 543 }
 544
 545 /*
 546  * Invoked when there is a new vhost-user connection established (when
 547  * there is a new virtio device being attached).
 548  */
 549 int
 550 vhost_new_device(void)
 551 {
 552         struct virtio_net *dev;
 553         int i;
 554
 555         for (i = 0; i < MAX_VHOST_DEVICE; i++) {
 556                 if (vhost_devices[i] == NULL)
 557                         break;
 558         }
 559
 560         if (i == MAX_VHOST_DEVICE) {
 561                 RTE_LOG(ERR, VHOST_CONFIG,
 562                         "Failed to find a free slot for new device.\n");
 563                 return -1;
 564         }
 565
 566         dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
 567         if (dev == NULL) {
 568                 RTE_LOG(ERR, VHOST_CONFIG,
 569                         "Failed to allocate memory for new dev.\n");
 570                 return -1;
 571         }
 572
 573         vhost_devices[i] = dev;
 574         dev->vid = i;
 575         dev->flags = VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 576         dev->slave_req_fd = -1;
 577         dev->vdpa_dev_id = -1;
 578         dev->postcopy_ufd = -1;
 579         rte_spinlock_init(&dev->slave_req_lock);
 580
 581         return i;
 582 }
 583
 584 void
 585 vhost_destroy_device_notify(struct virtio_net *dev)
 586 {
 587         struct rte_vdpa_device *vdpa_dev;
 588         int did;
 589
 590         if (dev->flags & VIRTIO_DEV_RUNNING) {
 591                 did = dev->vdpa_dev_id;
 592                 vdpa_dev = rte_vdpa_get_device(did);
 593                 if (vdpa_dev && vdpa_dev->ops->dev_close)
 594                         vdpa_dev->ops->dev_close(dev->vid);
 595                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 596                 dev->notify_ops->destroy_device(dev->vid);
 597         }
 598 }
 599
 600 /*
 601  * Invoked when there is the vhost-user connection is broken (when
 602  * the virtio device is being detached).
 603  */
 604 void
 605 vhost_destroy_device(int vid)
 606 {
 607         struct virtio_net *dev = get_device(vid);
 608
 609         if (dev == NULL)
 610                 return;
 611
 612         vhost_destroy_device_notify(dev);
 613
 614         cleanup_device(dev, 1);
 615         free_device(dev);
 616
 617         vhost_devices[vid] = NULL;
 618 }
 619
 620 void
 621 vhost_attach_vdpa_device(int vid, int did)
 622 {
 623         struct virtio_net *dev = get_device(vid);
 624
 625         if (dev == NULL)
 626                 return;
 627
 628         if (rte_vdpa_get_device(did) == NULL)
 629                 return;
 630
 631         dev->vdpa_dev_id = did;
 632 }
 633
 634 void
 635 vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
 636 {
 637         struct virtio_net *dev;
 638         unsigned int len;
 639
 640         dev = get_device(vid);
 641         if (dev == NULL)
 642                 return;
 643
 644         len = if_len > sizeof(dev->ifname) ?
 645                 sizeof(dev->ifname) : if_len;
 646
 647         strncpy(dev->ifname, if_name, len);
 648         dev->ifname[sizeof(dev->ifname) - 1] = '\0';
 649 }
 650
 651 void
 652 vhost_enable_dequeue_zero_copy(int vid)
 653 {
 654         struct virtio_net *dev = get_device(vid);
 655
 656         if (dev == NULL)
 657                 return;
 658
 659         dev->dequeue_zero_copy = 1;
 660 }
 661
 662 void
 663 vhost_set_builtin_virtio_net(int vid, bool enable)
 664 {
 665         struct virtio_net *dev = get_device(vid);
 666
 667         if (dev == NULL)
 668                 return;
 669
 670         if (enable)
 671                 dev->flags |= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 672         else
 673                 dev->flags &= ~VIRTIO_DEV_BUILTIN_VIRTIO_NET;
 674 }
 675
 676 int
 677 rte_vhost_get_mtu(int vid, uint16_t *mtu)
 678 {
 679         struct virtio_net *dev = get_device(vid);
 680
 681         if (dev == NULL || mtu == NULL)
 682                 return -ENODEV;
 683
 684         if (!(dev->flags & VIRTIO_DEV_READY))
 685                 return -EAGAIN;
 686
 687         if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
 688                 return -ENOTSUP;
 689
 690         *mtu = dev->mtu;
 691
 692         return 0;
 693 }
 694
 695 int
 696 rte_vhost_get_numa_node(int vid)
 697 {
 698 #ifdef RTE_LIBRTE_VHOST_NUMA
 699         struct virtio_net *dev = get_device(vid);
 700         int numa_node;
 701         int ret;
 702
 703         if (dev == NULL || numa_available() != 0)
 704                 return -1;
 705
 706         ret = get_mempolicy(&numa_node, NULL, 0, dev,
 707                             MPOL_F_NODE | MPOL_F_ADDR);
 708         if (ret < 0) {
 709                 RTE_LOG(ERR, VHOST_CONFIG,
 710                         "(%d) failed to query numa node: %s\n",
 711                         vid, rte_strerror(errno));
 712                 return -1;
 713         }
 714
 715         return numa_node;
 716 #else
 717         RTE_SET_USED(vid);
 718         return -1;
 719 #endif
 720 }
 721
 722 uint32_t
 723 rte_vhost_get_queue_num(int vid)
 724 {
 725         struct virtio_net *dev = get_device(vid);
 726
 727         if (dev == NULL)
 728                 return 0;
 729
 730         return dev->nr_vring / 2;
 731 }
 732
 733 uint16_t
 734 rte_vhost_get_vring_num(int vid)
 735 {
 736         struct virtio_net *dev = get_device(vid);
 737
 738         if (dev == NULL)
 739                 return 0;
 740
 741         return dev->nr_vring;
 742 }
 743
 744 int
 745 rte_vhost_get_ifname(int vid, char *buf, size_t len)
 746 {
 747         struct virtio_net *dev = get_device(vid);
 748
 749         if (dev == NULL || buf == NULL)
 750                 return -1;
 751
 752         len = RTE_MIN(len, sizeof(dev->ifname));
 753
 754         strncpy(buf, dev->ifname, len);
 755         buf[len - 1] = '\0';
 756
 757         return 0;
 758 }
 759
 760 int
 761 rte_vhost_get_negotiated_features(int vid, uint64_t *features)
 762 {
 763         struct virtio_net *dev;
 764
 765         dev = get_device(vid);
 766         if (dev == NULL || features == NULL)
 767                 return -1;
 768
 769         *features = dev->features;
 770         return 0;
 771 }
 772
 773 int
 774 rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
 775 {
 776         struct virtio_net *dev;
 777         struct rte_vhost_memory *m;
 778         size_t size;
 779
 780         dev = get_device(vid);
 781         if (dev == NULL || mem == NULL)
 782                 return -1;
 783
 784         size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
 785         m = malloc(sizeof(struct rte_vhost_memory) + size);
 786         if (!m)
 787                 return -1;
 788
 789         m->nregions = dev->mem->nregions;
 790         memcpy(m->regions, dev->mem->regions, size);
 791         *mem = m;
 792
 793         return 0;
 794 }
 795
 796 int
 797 rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
 798                           struct rte_vhost_vring *vring)
 799 {
 800         struct virtio_net *dev;
 801         struct vhost_virtqueue *vq;
 802
 803         dev = get_device(vid);
 804         if (dev == NULL || vring == NULL)
 805                 return -1;
 806
 807         if (vring_idx >= VHOST_MAX_VRING)
 808                 return -1;
 809
 810         vq = dev->virtqueue[vring_idx];
 811         if (!vq)
 812                 return -1;
 813
 814         vring->desc  = vq->desc;
 815         vring->avail = vq->avail;
 816         vring->used  = vq->used;
 817         vring->log_guest_addr  = vq->log_guest_addr;
 818
 819         vring->callfd  = vq->callfd;
 820         vring->kickfd  = vq->kickfd;
 821         vring->size    = vq->size;
 822
 823         return 0;
 824 }
 825
 826 int
 827 rte_vhost_vring_call(int vid, uint16_t vring_idx)
 828 {
 829         struct virtio_net *dev;
 830         struct vhost_virtqueue *vq;
 831
 832         dev = get_device(vid);
 833         if (!dev)
 834                 return -1;
 835
 836         if (vring_idx >= VHOST_MAX_VRING)
 837                 return -1;
 838
 839         vq = dev->virtqueue[vring_idx];
 840         if (!vq)
 841                 return -1;
 842
 843         if (vq_is_packed(dev))
 844                 vhost_vring_call_packed(dev, vq);
 845         else
 846                 vhost_vring_call_split(dev, vq);
 847
 848         return 0;
 849 }
 850
 851 uint16_t
 852 rte_vhost_avail_entries(int vid, uint16_t queue_id)
 853 {
 854         struct virtio_net *dev;
 855         struct vhost_virtqueue *vq;
 856         uint16_t ret = 0;
 857
 858         dev = get_device(vid);
 859         if (!dev)
 860                 return 0;
 861
 862         vq = dev->virtqueue[queue_id];
 863
 864         rte_spinlock_lock(&vq->access_lock);
 865
 866         if (unlikely(!vq->enabled || vq->avail == NULL))
 867                 goto out;
 868
 869         ret = *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
 870
 871 out:
 872         rte_spinlock_unlock(&vq->access_lock);
 873         return ret;
 874 }
 875
 876 static inline int
 877 vhost_enable_notify_split(struct virtio_net *dev,
 878                 struct vhost_virtqueue *vq, int enable)
 879 {
 880         if (vq->used == NULL)
 881                 return -1;
 882
 883         if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
 884                 if (enable)
 885                         vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
 886                 else
 887                         vq->used->flags |= VRING_USED_F_NO_NOTIFY;
 888         } else {
 889                 if (enable)
 890                         vhost_avail_event(vq) = vq->last_avail_idx;
 891         }
 892         return 0;
 893 }
 894
 895 static inline int
 896 vhost_enable_notify_packed(struct virtio_net *dev,
 897                 struct vhost_virtqueue *vq, int enable)
 898 {
 899         uint16_t flags;
 900
 901         if (vq->device_event == NULL)
 902                 return -1;
 903
 904         if (!enable) {
 905                 vq->device_event->flags = VRING_EVENT_F_DISABLE;
 906                 return 0;
 907         }
 908
 909         flags = VRING_EVENT_F_ENABLE;
 910         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
 911                 flags = VRING_EVENT_F_DESC;
 912                 vq->device_event->off_wrap = vq->last_avail_idx |
 913                         vq->avail_wrap_counter << 15;
 914         }
 915
 916         rte_smp_wmb();
 917
 918         vq->device_event->flags = flags;
 919         return 0;
 920 }
 921
 922 int
 923 rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
 924 {
 925         struct virtio_net *dev = get_device(vid);
 926         struct vhost_virtqueue *vq;
 927         int ret;
 928
 929         if (!dev)
 930                 return -1;
 931
 932         vq = dev->virtqueue[queue_id];
 933
 934         rte_spinlock_lock(&vq->access_lock);
 935
 936         if (vq_is_packed(dev))
 937                 ret = vhost_enable_notify_packed(dev, vq, enable);
 938         else
 939                 ret = vhost_enable_notify_split(dev, vq, enable);
 940
 941         rte_spinlock_unlock(&vq->access_lock);
 942
 943         return ret;
 944 }
 945
 946 void
 947 rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
 948 {
 949         struct virtio_net *dev = get_device(vid);
 950
 951         if (dev == NULL)
 952                 return;
 953
 954         vhost_log_write(dev, addr, len);
 955 }
 956
 957 void
 958 rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
 959                          uint64_t offset, uint64_t len)
 960 {
 961         struct virtio_net *dev;
 962         struct vhost_virtqueue *vq;
 963
 964         dev = get_device(vid);
 965         if (dev == NULL)
 966                 return;
 967
 968         if (vring_idx >= VHOST_MAX_VRING)
 969                 return;
 970         vq = dev->virtqueue[vring_idx];
 971         if (!vq)
 972                 return;
 973
 974         vhost_log_used_vring(dev, vq, offset, len);
 975 }
 976
 977 uint32_t
 978 rte_vhost_rx_queue_count(int vid, uint16_t qid)
 979 {
 980         struct virtio_net *dev;
 981         struct vhost_virtqueue *vq;
 982         uint32_t ret = 0;
 983
 984         dev = get_device(vid);
 985         if (dev == NULL)
 986                 return 0;
 987
 988         if (unlikely(qid >= dev->nr_vring || (qid & 1) == 0)) {
 989                 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
 990                         dev->vid, __func__, qid);
 991                 return 0;
 992         }
 993
 994         vq = dev->virtqueue[qid];
 995         if (vq == NULL)
 996                 return 0;
 997
 998         rte_spinlock_lock(&vq->access_lock);
 999
1000         if (unlikely(vq->enabled == 0 || vq->avail == NULL))
1001                 goto out;
1002
1003         ret = *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx;
1004
1005 out:
1006         rte_spinlock_unlock(&vq->access_lock);
1007         return ret;
1008 }
1009
1010 int rte_vhost_get_vdpa_device_id(int vid)
1011 {
1012         struct virtio_net *dev = get_device(vid);
1013
1014         if (dev == NULL)
1015                 return -1;
1016
1017         return dev->vdpa_dev_id;
1018 }
1019
1020 int rte_vhost_get_log_base(int vid, uint64_t *log_base,
1021                 uint64_t *log_size)
1022 {
1023         struct virtio_net *dev = get_device(vid);
1024
1025         if (dev == NULL || log_base == NULL || log_size == NULL)
1026                 return -1;
1027
1028         *log_base = dev->log_base;
1029         *log_size = dev->log_size;
1030
1031         return 0;
1032 }
1033
1034 int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
1035                 uint16_t *last_avail_idx, uint16_t *last_used_idx)
1036 {
1037         struct virtio_net *dev = get_device(vid);
1038
1039         if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1040                 return -1;
1041
1042         *last_avail_idx = dev->virtqueue[queue_id]->last_avail_idx;
1043         *last_used_idx = dev->virtqueue[queue_id]->last_used_idx;
1044
1045         return 0;
1046 }
1047
1048 int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
1049                 uint16_t last_avail_idx, uint16_t last_used_idx)
1050 {
1051         struct virtio_net *dev = get_device(vid);
1052
1053         if (!dev)
1054                 return -1;
1055
1056         dev->virtqueue[queue_id]->last_avail_idx = last_avail_idx;
1057         dev->virtqueue[queue_id]->last_used_idx = last_used_idx;
1058
1059         return 0;
1060 }
1061
1062 int rte_vhost_extern_callback_register(int vid,
1063                 struct rte_vhost_user_extern_ops const * const ops, void *ctx)
1064 {
1065         struct virtio_net *dev = get_device(vid);
1066
1067         if (dev == NULL || ops == NULL)
1068                 return -1;
1069
1070         dev->extern_ops = *ops;
1071         dev->extern_data = ctx;
1072         return 0;
1073 }