lib/vhost/virtio_net.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2016 Intel Corporation
   3  */
   4
   5 #include <stdint.h>
   6 #include <stdbool.h>
   7 #include <linux/virtio_net.h>
   8
   9 #include <rte_mbuf.h>
  10 #include <rte_memcpy.h>
  11 #include <rte_net.h>
  12 #include <rte_ether.h>
  13 #include <rte_ip.h>
  14 #include <rte_vhost.h>
  15 #include <rte_tcp.h>
  16 #include <rte_udp.h>
  17 #include <rte_sctp.h>
  18 #include <rte_arp.h>
  19 #include <rte_spinlock.h>
  20 #include <rte_malloc.h>
  21 #include <rte_vhost_async.h>
  22
  23 #include "iotlb.h"
  24 #include "vhost.h"
  25
  26 #define MAX_BATCH_LEN 256
  27
  28 static  __rte_always_inline bool
  29 rxvq_is_mergeable(struct virtio_net *dev)
  30 {
  31         return dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF);
  32 }
  33
  34 static  __rte_always_inline bool
  35 virtio_net_is_inorder(struct virtio_net *dev)
  36 {
  37         return dev->features & (1ULL << VIRTIO_F_IN_ORDER);
  38 }
  39
  40 static bool
  41 is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
  42 {
  43         return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
  44 }
  45
  46 static inline void
  47 do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq)
  48 {
  49         struct batch_copy_elem *elem = vq->batch_copy_elems;
  50         uint16_t count = vq->batch_copy_nb_elems;
  51         int i;
  52
  53         for (i = 0; i < count; i++) {
  54                 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
  55                 vhost_log_cache_write_iova(dev, vq, elem[i].log_addr,
  56                                            elem[i].len);
  57                 PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0);
  58         }
  59
  60         vq->batch_copy_nb_elems = 0;
  61 }
  62
  63 static inline void
  64 do_data_copy_dequeue(struct vhost_virtqueue *vq)
  65 {
  66         struct batch_copy_elem *elem = vq->batch_copy_elems;
  67         uint16_t count = vq->batch_copy_nb_elems;
  68         int i;
  69
  70         for (i = 0; i < count; i++)
  71                 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
  72
  73         vq->batch_copy_nb_elems = 0;
  74 }
  75
  76 static __rte_always_inline void
  77 do_flush_shadow_used_ring_split(struct virtio_net *dev,
  78                         struct vhost_virtqueue *vq,
  79                         uint16_t to, uint16_t from, uint16_t size)
  80 {
  81         rte_memcpy(&vq->used->ring[to],
  82                         &vq->shadow_used_split[from],
  83                         size * sizeof(struct vring_used_elem));
  84         vhost_log_cache_used_vring(dev, vq,
  85                         offsetof(struct vring_used, ring[to]),
  86                         size * sizeof(struct vring_used_elem));
  87 }
  88
  89 static __rte_always_inline void
  90 flush_shadow_used_ring_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
  91 {
  92         uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
  93
  94         if (used_idx + vq->shadow_used_idx <= vq->size) {
  95                 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0,
  96                                           vq->shadow_used_idx);
  97         } else {
  98                 uint16_t size;
  99
 100                 /* update used ring interval [used_idx, vq->size] */
 101                 size = vq->size - used_idx;
 102                 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, size);
 103
 104                 /* update the left half used ring interval [0, left_size] */
 105                 do_flush_shadow_used_ring_split(dev, vq, 0, size,
 106                                           vq->shadow_used_idx - size);
 107         }
 108         vq->last_used_idx += vq->shadow_used_idx;
 109
 110         vhost_log_cache_sync(dev, vq);
 111
 112         __atomic_add_fetch(&vq->used->idx, vq->shadow_used_idx,
 113                            __ATOMIC_RELEASE);
 114         vq->shadow_used_idx = 0;
 115         vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
 116                 sizeof(vq->used->idx));
 117 }
 118
 119 static __rte_always_inline void
 120 update_shadow_used_ring_split(struct vhost_virtqueue *vq,
 121                          uint16_t desc_idx, uint32_t len)
 122 {
 123         uint16_t i = vq->shadow_used_idx++;
 124
 125         vq->shadow_used_split[i].id  = desc_idx;
 126         vq->shadow_used_split[i].len = len;
 127 }
 128
 129 static __rte_always_inline void
 130 vhost_flush_enqueue_shadow_packed(struct virtio_net *dev,
 131                                   struct vhost_virtqueue *vq)
 132 {
 133         int i;
 134         uint16_t used_idx = vq->last_used_idx;
 135         uint16_t head_idx = vq->last_used_idx;
 136         uint16_t head_flags = 0;
 137
 138         /* Split loop in two to save memory barriers */
 139         for (i = 0; i < vq->shadow_used_idx; i++) {
 140                 vq->desc_packed[used_idx].id = vq->shadow_used_packed[i].id;
 141                 vq->desc_packed[used_idx].len = vq->shadow_used_packed[i].len;
 142
 143                 used_idx += vq->shadow_used_packed[i].count;
 144                 if (used_idx >= vq->size)
 145                         used_idx -= vq->size;
 146         }
 147
 148         /* The ordering for storing desc flags needs to be enforced. */
 149         rte_atomic_thread_fence(__ATOMIC_RELEASE);
 150
 151         for (i = 0; i < vq->shadow_used_idx; i++) {
 152                 uint16_t flags;
 153
 154                 if (vq->shadow_used_packed[i].len)
 155                         flags = VRING_DESC_F_WRITE;
 156                 else
 157                         flags = 0;
 158
 159                 if (vq->used_wrap_counter) {
 160                         flags |= VRING_DESC_F_USED;
 161                         flags |= VRING_DESC_F_AVAIL;
 162                 } else {
 163                         flags &= ~VRING_DESC_F_USED;
 164                         flags &= ~VRING_DESC_F_AVAIL;
 165                 }
 166
 167                 if (i > 0) {
 168                         vq->desc_packed[vq->last_used_idx].flags = flags;
 169
 170                         vhost_log_cache_used_vring(dev, vq,
 171                                         vq->last_used_idx *
 172                                         sizeof(struct vring_packed_desc),
 173                                         sizeof(struct vring_packed_desc));
 174                 } else {
 175                         head_idx = vq->last_used_idx;
 176                         head_flags = flags;
 177                 }
 178
 179                 vq_inc_last_used_packed(vq, vq->shadow_used_packed[i].count);
 180         }
 181
 182         vq->desc_packed[head_idx].flags = head_flags;
 183
 184         vhost_log_cache_used_vring(dev, vq,
 185                                 head_idx *
 186                                 sizeof(struct vring_packed_desc),
 187                                 sizeof(struct vring_packed_desc));
 188
 189         vq->shadow_used_idx = 0;
 190         vhost_log_cache_sync(dev, vq);
 191 }
 192
 193 static __rte_always_inline void
 194 vhost_flush_dequeue_shadow_packed(struct virtio_net *dev,
 195                                   struct vhost_virtqueue *vq)
 196 {
 197         struct vring_used_elem_packed *used_elem = &vq->shadow_used_packed[0];
 198
 199         vq->desc_packed[vq->shadow_last_used_idx].id = used_elem->id;
 200         /* desc flags is the synchronization point for virtio packed vring */
 201         __atomic_store_n(&vq->desc_packed[vq->shadow_last_used_idx].flags,
 202                          used_elem->flags, __ATOMIC_RELEASE);
 203
 204         vhost_log_cache_used_vring(dev, vq, vq->shadow_last_used_idx *
 205                                    sizeof(struct vring_packed_desc),
 206                                    sizeof(struct vring_packed_desc));
 207         vq->shadow_used_idx = 0;
 208         vhost_log_cache_sync(dev, vq);
 209 }
 210
 211 static __rte_always_inline void
 212 vhost_flush_enqueue_batch_packed(struct virtio_net *dev,
 213                                  struct vhost_virtqueue *vq,
 214                                  uint64_t *lens,
 215                                  uint16_t *ids)
 216 {
 217         uint16_t i;
 218         uint16_t flags;
 219         uint16_t last_used_idx;
 220         struct vring_packed_desc *desc_base;
 221
 222         last_used_idx = vq->last_used_idx;
 223         desc_base = &vq->desc_packed[last_used_idx];
 224
 225         flags = PACKED_DESC_ENQUEUE_USED_FLAG(vq->used_wrap_counter);
 226
 227         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
 228                 desc_base[i].id = ids[i];
 229                 desc_base[i].len = lens[i];
 230         }
 231
 232         rte_atomic_thread_fence(__ATOMIC_RELEASE);
 233
 234         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
 235                 desc_base[i].flags = flags;
 236         }
 237
 238         vhost_log_cache_used_vring(dev, vq, last_used_idx *
 239                                    sizeof(struct vring_packed_desc),
 240                                    sizeof(struct vring_packed_desc) *
 241                                    PACKED_BATCH_SIZE);
 242         vhost_log_cache_sync(dev, vq);
 243
 244         vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
 245 }
 246
 247 static __rte_always_inline void
 248 vhost_shadow_dequeue_batch_packed_inorder(struct vhost_virtqueue *vq,
 249                                           uint16_t id)
 250 {
 251         vq->shadow_used_packed[0].id = id;
 252
 253         if (!vq->shadow_used_idx) {
 254                 vq->shadow_last_used_idx = vq->last_used_idx;
 255                 vq->shadow_used_packed[0].flags =
 256                         PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
 257                 vq->shadow_used_packed[0].len = 0;
 258                 vq->shadow_used_packed[0].count = 1;
 259                 vq->shadow_used_idx++;
 260         }
 261
 262         vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
 263 }
 264
 265 static __rte_always_inline void
 266 vhost_shadow_dequeue_batch_packed(struct virtio_net *dev,
 267                                   struct vhost_virtqueue *vq,
 268                                   uint16_t *ids)
 269 {
 270         uint16_t flags;
 271         uint16_t i;
 272         uint16_t begin;
 273
 274         flags = PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
 275
 276         if (!vq->shadow_used_idx) {
 277                 vq->shadow_last_used_idx = vq->last_used_idx;
 278                 vq->shadow_used_packed[0].id  = ids[0];
 279                 vq->shadow_used_packed[0].len = 0;
 280                 vq->shadow_used_packed[0].count = 1;
 281                 vq->shadow_used_packed[0].flags = flags;
 282                 vq->shadow_used_idx++;
 283                 begin = 1;
 284         } else
 285                 begin = 0;
 286
 287         vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE) {
 288                 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
 289                 vq->desc_packed[vq->last_used_idx + i].len = 0;
 290         }
 291
 292         rte_atomic_thread_fence(__ATOMIC_RELEASE);
 293         vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE)
 294                 vq->desc_packed[vq->last_used_idx + i].flags = flags;
 295
 296         vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
 297                                    sizeof(struct vring_packed_desc),
 298                                    sizeof(struct vring_packed_desc) *
 299                                    PACKED_BATCH_SIZE);
 300         vhost_log_cache_sync(dev, vq);
 301
 302         vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
 303 }
 304
 305 static __rte_always_inline void
 306 vhost_shadow_dequeue_single_packed(struct vhost_virtqueue *vq,
 307                                    uint16_t buf_id,
 308                                    uint16_t count)
 309 {
 310         uint16_t flags;
 311
 312         flags = vq->desc_packed[vq->last_used_idx].flags;
 313         if (vq->used_wrap_counter) {
 314                 flags |= VRING_DESC_F_USED;
 315                 flags |= VRING_DESC_F_AVAIL;
 316         } else {
 317                 flags &= ~VRING_DESC_F_USED;
 318                 flags &= ~VRING_DESC_F_AVAIL;
 319         }
 320
 321         if (!vq->shadow_used_idx) {
 322                 vq->shadow_last_used_idx = vq->last_used_idx;
 323
 324                 vq->shadow_used_packed[0].id  = buf_id;
 325                 vq->shadow_used_packed[0].len = 0;
 326                 vq->shadow_used_packed[0].flags = flags;
 327                 vq->shadow_used_idx++;
 328         } else {
 329                 vq->desc_packed[vq->last_used_idx].id = buf_id;
 330                 vq->desc_packed[vq->last_used_idx].len = 0;
 331                 vq->desc_packed[vq->last_used_idx].flags = flags;
 332         }
 333
 334         vq_inc_last_used_packed(vq, count);
 335 }
 336
 337 static __rte_always_inline void
 338 vhost_shadow_dequeue_single_packed_inorder(struct vhost_virtqueue *vq,
 339                                            uint16_t buf_id,
 340                                            uint16_t count)
 341 {
 342         uint16_t flags;
 343
 344         vq->shadow_used_packed[0].id = buf_id;
 345
 346         flags = vq->desc_packed[vq->last_used_idx].flags;
 347         if (vq->used_wrap_counter) {
 348                 flags |= VRING_DESC_F_USED;
 349                 flags |= VRING_DESC_F_AVAIL;
 350         } else {
 351                 flags &= ~VRING_DESC_F_USED;
 352                 flags &= ~VRING_DESC_F_AVAIL;
 353         }
 354
 355         if (!vq->shadow_used_idx) {
 356                 vq->shadow_last_used_idx = vq->last_used_idx;
 357                 vq->shadow_used_packed[0].len = 0;
 358                 vq->shadow_used_packed[0].flags = flags;
 359                 vq->shadow_used_idx++;
 360         }
 361
 362         vq_inc_last_used_packed(vq, count);
 363 }
 364
 365 static __rte_always_inline void
 366 vhost_shadow_enqueue_packed(struct vhost_virtqueue *vq,
 367                                    uint32_t *len,
 368                                    uint16_t *id,
 369                                    uint16_t *count,
 370                                    uint16_t num_buffers)
 371 {
 372         uint16_t i;
 373
 374         for (i = 0; i < num_buffers; i++) {
 375                 /* enqueue shadow flush action aligned with batch num */
 376                 if (!vq->shadow_used_idx)
 377                         vq->shadow_aligned_idx = vq->last_used_idx &
 378                                 PACKED_BATCH_MASK;
 379                 vq->shadow_used_packed[vq->shadow_used_idx].id  = id[i];
 380                 vq->shadow_used_packed[vq->shadow_used_idx].len = len[i];
 381                 vq->shadow_used_packed[vq->shadow_used_idx].count = count[i];
 382                 vq->shadow_aligned_idx += count[i];
 383                 vq->shadow_used_idx++;
 384         }
 385 }
 386
 387 static __rte_always_inline void
 388 vhost_shadow_enqueue_single_packed(struct virtio_net *dev,
 389                                    struct vhost_virtqueue *vq,
 390                                    uint32_t *len,
 391                                    uint16_t *id,
 392                                    uint16_t *count,
 393                                    uint16_t num_buffers)
 394 {
 395         vhost_shadow_enqueue_packed(vq, len, id, count, num_buffers);
 396
 397         if (vq->shadow_aligned_idx >= PACKED_BATCH_SIZE) {
 398                 do_data_copy_enqueue(dev, vq);
 399                 vhost_flush_enqueue_shadow_packed(dev, vq);
 400         }
 401 }
 402
 403 /* avoid write operation when necessary, to lessen cache issues */
 404 #define ASSIGN_UNLESS_EQUAL(var, val) do {      \
 405         if ((var) != (val))                     \
 406                 (var) = (val);                  \
 407 } while (0)
 408
 409 static __rte_always_inline void
 410 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
 411 {
 412         uint64_t csum_l4 = m_buf->ol_flags & RTE_MBUF_F_TX_L4_MASK;
 413
 414         if (m_buf->ol_flags & RTE_MBUF_F_TX_TCP_SEG)
 415                 csum_l4 |= RTE_MBUF_F_TX_TCP_CKSUM;
 416
 417         if (csum_l4) {
 418                 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 419                 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
 420
 421                 switch (csum_l4) {
 422                 case RTE_MBUF_F_TX_TCP_CKSUM:
 423                         net_hdr->csum_offset = (offsetof(struct rte_tcp_hdr,
 424                                                 cksum));
 425                         break;
 426                 case RTE_MBUF_F_TX_UDP_CKSUM:
 427                         net_hdr->csum_offset = (offsetof(struct rte_udp_hdr,
 428                                                 dgram_cksum));
 429                         break;
 430                 case RTE_MBUF_F_TX_SCTP_CKSUM:
 431                         net_hdr->csum_offset = (offsetof(struct rte_sctp_hdr,
 432                                                 cksum));
 433                         break;
 434                 }
 435         } else {
 436                 ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
 437                 ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
 438                 ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
 439         }
 440
 441         /* IP cksum verification cannot be bypassed, then calculate here */
 442         if (m_buf->ol_flags & RTE_MBUF_F_TX_IP_CKSUM) {
 443                 struct rte_ipv4_hdr *ipv4_hdr;
 444
 445                 ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct rte_ipv4_hdr *,
 446                                                    m_buf->l2_len);
 447                 ipv4_hdr->hdr_checksum = 0;
 448                 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
 449         }
 450
 451         if (m_buf->ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
 452                 if (m_buf->ol_flags & RTE_MBUF_F_TX_IPV4)
 453                         net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
 454                 else
 455                         net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
 456                 net_hdr->gso_size = m_buf->tso_segsz;
 457                 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
 458                                         + m_buf->l4_len;
 459         } else if (m_buf->ol_flags & RTE_MBUF_F_TX_UDP_SEG) {
 460                 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
 461                 net_hdr->gso_size = m_buf->tso_segsz;
 462                 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len +
 463                         m_buf->l4_len;
 464         } else {
 465                 ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
 466                 ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
 467                 ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
 468         }
 469 }
 470
 471 static __rte_always_inline int
 472 map_one_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
 473                 struct buf_vector *buf_vec, uint16_t *vec_idx,
 474                 uint64_t desc_iova, uint64_t desc_len, uint8_t perm)
 475 {
 476         uint16_t vec_id = *vec_idx;
 477
 478         while (desc_len) {
 479                 uint64_t desc_addr;
 480                 uint64_t desc_chunck_len = desc_len;
 481
 482                 if (unlikely(vec_id >= BUF_VECTOR_MAX))
 483                         return -1;
 484
 485                 desc_addr = vhost_iova_to_vva(dev, vq,
 486                                 desc_iova,
 487                                 &desc_chunck_len,
 488                                 perm);
 489                 if (unlikely(!desc_addr))
 490                         return -1;
 491
 492                 rte_prefetch0((void *)(uintptr_t)desc_addr);
 493
 494                 buf_vec[vec_id].buf_iova = desc_iova;
 495                 buf_vec[vec_id].buf_addr = desc_addr;
 496                 buf_vec[vec_id].buf_len  = desc_chunck_len;
 497
 498                 desc_len -= desc_chunck_len;
 499                 desc_iova += desc_chunck_len;
 500                 vec_id++;
 501         }
 502         *vec_idx = vec_id;
 503
 504         return 0;
 505 }
 506
 507 static __rte_always_inline int
 508 fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 509                          uint32_t avail_idx, uint16_t *vec_idx,
 510                          struct buf_vector *buf_vec, uint16_t *desc_chain_head,
 511                          uint32_t *desc_chain_len, uint8_t perm)
 512 {
 513         uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
 514         uint16_t vec_id = *vec_idx;
 515         uint32_t len    = 0;
 516         uint64_t dlen;
 517         uint32_t nr_descs = vq->size;
 518         uint32_t cnt    = 0;
 519         struct vring_desc *descs = vq->desc;
 520         struct vring_desc *idesc = NULL;
 521
 522         if (unlikely(idx >= vq->size))
 523                 return -1;
 524
 525         *desc_chain_head = idx;
 526
 527         if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
 528                 dlen = vq->desc[idx].len;
 529                 nr_descs = dlen / sizeof(struct vring_desc);
 530                 if (unlikely(nr_descs > vq->size))
 531                         return -1;
 532
 533                 descs = (struct vring_desc *)(uintptr_t)
 534                         vhost_iova_to_vva(dev, vq, vq->desc[idx].addr,
 535                                                 &dlen,
 536                                                 VHOST_ACCESS_RO);
 537                 if (unlikely(!descs))
 538                         return -1;
 539
 540                 if (unlikely(dlen < vq->desc[idx].len)) {
 541                         /*
 542                          * The indirect desc table is not contiguous
 543                          * in process VA space, we have to copy it.
 544                          */
 545                         idesc = vhost_alloc_copy_ind_table(dev, vq,
 546                                         vq->desc[idx].addr, vq->desc[idx].len);
 547                         if (unlikely(!idesc))
 548                                 return -1;
 549
 550                         descs = idesc;
 551                 }
 552
 553                 idx = 0;
 554         }
 555
 556         while (1) {
 557                 if (unlikely(idx >= nr_descs || cnt++ >= nr_descs)) {
 558                         free_ind_table(idesc);
 559                         return -1;
 560                 }
 561
 562                 dlen = descs[idx].len;
 563                 len += dlen;
 564
 565                 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
 566                                                 descs[idx].addr, dlen,
 567                                                 perm))) {
 568                         free_ind_table(idesc);
 569                         return -1;
 570                 }
 571
 572                 if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
 573                         break;
 574
 575                 idx = descs[idx].next;
 576         }
 577
 578         *desc_chain_len = len;
 579         *vec_idx = vec_id;
 580
 581         if (unlikely(!!idesc))
 582                 free_ind_table(idesc);
 583
 584         return 0;
 585 }
 586
 587 /*
 588  * Returns -1 on fail, 0 on success
 589  */
 590 static inline int
 591 reserve_avail_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 592                                 uint32_t size, struct buf_vector *buf_vec,
 593                                 uint16_t *num_buffers, uint16_t avail_head,
 594                                 uint16_t *nr_vec)
 595 {
 596         uint16_t cur_idx;
 597         uint16_t vec_idx = 0;
 598         uint16_t max_tries, tries = 0;
 599
 600         uint16_t head_idx = 0;
 601         uint32_t len = 0;
 602
 603         *num_buffers = 0;
 604         cur_idx  = vq->last_avail_idx;
 605
 606         if (rxvq_is_mergeable(dev))
 607                 max_tries = vq->size - 1;
 608         else
 609                 max_tries = 1;
 610
 611         while (size > 0) {
 612                 if (unlikely(cur_idx == avail_head))
 613                         return -1;
 614                 /*
 615                  * if we tried all available ring items, and still
 616                  * can't get enough buf, it means something abnormal
 617                  * happened.
 618                  */
 619                 if (unlikely(++tries > max_tries))
 620                         return -1;
 621
 622                 if (unlikely(fill_vec_buf_split(dev, vq, cur_idx,
 623                                                 &vec_idx, buf_vec,
 624                                                 &head_idx, &len,
 625                                                 VHOST_ACCESS_RW) < 0))
 626                         return -1;
 627                 len = RTE_MIN(len, size);
 628                 update_shadow_used_ring_split(vq, head_idx, len);
 629                 size -= len;
 630
 631                 cur_idx++;
 632                 *num_buffers += 1;
 633         }
 634
 635         *nr_vec = vec_idx;
 636
 637         return 0;
 638 }
 639
 640 static __rte_always_inline int
 641 fill_vec_buf_packed_indirect(struct virtio_net *dev,
 642                         struct vhost_virtqueue *vq,
 643                         struct vring_packed_desc *desc, uint16_t *vec_idx,
 644                         struct buf_vector *buf_vec, uint32_t *len, uint8_t perm)
 645 {
 646         uint16_t i;
 647         uint32_t nr_descs;
 648         uint16_t vec_id = *vec_idx;
 649         uint64_t dlen;
 650         struct vring_packed_desc *descs, *idescs = NULL;
 651
 652         dlen = desc->len;
 653         descs = (struct vring_packed_desc *)(uintptr_t)
 654                 vhost_iova_to_vva(dev, vq, desc->addr, &dlen, VHOST_ACCESS_RO);
 655         if (unlikely(!descs))
 656                 return -1;
 657
 658         if (unlikely(dlen < desc->len)) {
 659                 /*
 660                  * The indirect desc table is not contiguous
 661                  * in process VA space, we have to copy it.
 662                  */
 663                 idescs = vhost_alloc_copy_ind_table(dev,
 664                                 vq, desc->addr, desc->len);
 665                 if (unlikely(!idescs))
 666                         return -1;
 667
 668                 descs = idescs;
 669         }
 670
 671         nr_descs =  desc->len / sizeof(struct vring_packed_desc);
 672         if (unlikely(nr_descs >= vq->size)) {
 673                 free_ind_table(idescs);
 674                 return -1;
 675         }
 676
 677         for (i = 0; i < nr_descs; i++) {
 678                 if (unlikely(vec_id >= BUF_VECTOR_MAX)) {
 679                         free_ind_table(idescs);
 680                         return -1;
 681                 }
 682
 683                 dlen = descs[i].len;
 684                 *len += dlen;
 685                 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
 686                                                 descs[i].addr, dlen,
 687                                                 perm)))
 688                         return -1;
 689         }
 690         *vec_idx = vec_id;
 691
 692         if (unlikely(!!idescs))
 693                 free_ind_table(idescs);
 694
 695         return 0;
 696 }
 697
 698 static __rte_always_inline int
 699 fill_vec_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 700                                 uint16_t avail_idx, uint16_t *desc_count,
 701                                 struct buf_vector *buf_vec, uint16_t *vec_idx,
 702                                 uint16_t *buf_id, uint32_t *len, uint8_t perm)
 703 {
 704         bool wrap_counter = vq->avail_wrap_counter;
 705         struct vring_packed_desc *descs = vq->desc_packed;
 706         uint16_t vec_id = *vec_idx;
 707         uint64_t dlen;
 708
 709         if (avail_idx < vq->last_avail_idx)
 710                 wrap_counter ^= 1;
 711
 712         /*
 713          * Perform a load-acquire barrier in desc_is_avail to
 714          * enforce the ordering between desc flags and desc
 715          * content.
 716          */
 717         if (unlikely(!desc_is_avail(&descs[avail_idx], wrap_counter)))
 718                 return -1;
 719
 720         *desc_count = 0;
 721         *len = 0;
 722
 723         while (1) {
 724                 if (unlikely(vec_id >= BUF_VECTOR_MAX))
 725                         return -1;
 726
 727                 if (unlikely(*desc_count >= vq->size))
 728                         return -1;
 729
 730                 *desc_count += 1;
 731                 *buf_id = descs[avail_idx].id;
 732
 733                 if (descs[avail_idx].flags & VRING_DESC_F_INDIRECT) {
 734                         if (unlikely(fill_vec_buf_packed_indirect(dev, vq,
 735                                                         &descs[avail_idx],
 736                                                         &vec_id, buf_vec,
 737                                                         len, perm) < 0))
 738                                 return -1;
 739                 } else {
 740                         dlen = descs[avail_idx].len;
 741                         *len += dlen;
 742
 743                         if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
 744                                                         descs[avail_idx].addr,
 745                                                         dlen,
 746                                                         perm)))
 747                                 return -1;
 748                 }
 749
 750                 if ((descs[avail_idx].flags & VRING_DESC_F_NEXT) == 0)
 751                         break;
 752
 753                 if (++avail_idx >= vq->size) {
 754                         avail_idx -= vq->size;
 755                         wrap_counter ^= 1;
 756                 }
 757         }
 758
 759         *vec_idx = vec_id;
 760
 761         return 0;
 762 }
 763
 764 static __rte_noinline void
 765 copy_vnet_hdr_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
 766                 struct buf_vector *buf_vec,
 767                 struct virtio_net_hdr_mrg_rxbuf *hdr)
 768 {
 769         uint64_t len;
 770         uint64_t remain = dev->vhost_hlen;
 771         uint64_t src = (uint64_t)(uintptr_t)hdr, dst;
 772         uint64_t iova = buf_vec->buf_iova;
 773
 774         while (remain) {
 775                 len = RTE_MIN(remain,
 776                                 buf_vec->buf_len);
 777                 dst = buf_vec->buf_addr;
 778                 rte_memcpy((void *)(uintptr_t)dst,
 779                                 (void *)(uintptr_t)src,
 780                                 len);
 781
 782                 PRINT_PACKET(dev, (uintptr_t)dst,
 783                                 (uint32_t)len, 0);
 784                 vhost_log_cache_write_iova(dev, vq,
 785                                 iova, len);
 786
 787                 remain -= len;
 788                 iova += len;
 789                 src += len;
 790                 buf_vec++;
 791         }
 792 }
 793
 794 static __rte_always_inline int
 795 async_iter_initialize(struct vhost_async *async)
 796 {
 797         struct rte_vhost_iov_iter *iter;
 798
 799         if (unlikely(async->iovec_idx >= VHOST_MAX_ASYNC_VEC)) {
 800                 VHOST_LOG_DATA(ERR, "no more async iovec available\n");
 801                 return -1;
 802         }
 803
 804         iter = async->iov_iter + async->iter_idx;
 805         iter->iov = async->iovec + async->iovec_idx;
 806         iter->nr_segs = 0;
 807
 808         return 0;
 809 }
 810
 811 static __rte_always_inline int
 812 async_iter_add_iovec(struct vhost_async *async, void *src, void *dst, size_t len)
 813 {
 814         struct rte_vhost_iov_iter *iter;
 815         struct rte_vhost_iovec *iovec;
 816
 817         if (unlikely(async->iovec_idx >= VHOST_MAX_ASYNC_VEC)) {
 818                 static bool vhost_max_async_vec_log;
 819
 820                 if (!vhost_max_async_vec_log) {
 821                         VHOST_LOG_DATA(ERR, "no more async iovec available\n");
 822                         vhost_max_async_vec_log = true;
 823                 }
 824
 825                 return -1;
 826         }
 827
 828         iter = async->iov_iter + async->iter_idx;
 829         iovec = async->iovec + async->iovec_idx;
 830
 831         iovec->src_addr = src;
 832         iovec->dst_addr = dst;
 833         iovec->len = len;
 834
 835         iter->nr_segs++;
 836         async->iovec_idx++;
 837
 838         return 0;
 839 }
 840
 841 static __rte_always_inline void
 842 async_iter_finalize(struct vhost_async *async)
 843 {
 844         async->iter_idx++;
 845 }
 846
 847 static __rte_always_inline void
 848 async_iter_cancel(struct vhost_async *async)
 849 {
 850         struct rte_vhost_iov_iter *iter;
 851
 852         iter = async->iov_iter + async->iter_idx;
 853         async->iovec_idx -= iter->nr_segs;
 854         iter->nr_segs = 0;
 855         iter->iov = NULL;
 856 }
 857
 858 static __rte_always_inline void
 859 async_iter_reset(struct vhost_async *async)
 860 {
 861         async->iter_idx = 0;
 862         async->iovec_idx = 0;
 863 }
 864
 865 static __rte_always_inline int
 866 async_mbuf_to_desc_seg(struct virtio_net *dev, struct vhost_virtqueue *vq,
 867                 struct rte_mbuf *m, uint32_t mbuf_offset,
 868                 uint64_t buf_iova, uint32_t cpy_len)
 869 {
 870         struct vhost_async *async = vq->async;
 871         uint64_t mapped_len;
 872         uint32_t buf_offset = 0;
 873         void *hpa;
 874
 875         while (cpy_len) {
 876                 hpa = (void *)(uintptr_t)gpa_to_first_hpa(dev,
 877                                 buf_iova + buf_offset, cpy_len, &mapped_len);
 878                 if (unlikely(!hpa)) {
 879                         VHOST_LOG_DATA(ERR, "(%d) %s: failed to get hpa.\n", dev->vid, __func__);
 880                         return -1;
 881                 }
 882
 883                 if (unlikely(async_iter_add_iovec(async,
 884                                                 (void *)(uintptr_t)rte_pktmbuf_iova_offset(m,
 885                                                         mbuf_offset),
 886                                                 hpa, (size_t)mapped_len)))
 887                         return -1;
 888
 889                 cpy_len -= (uint32_t)mapped_len;
 890                 mbuf_offset += (uint32_t)mapped_len;
 891                 buf_offset += (uint32_t)mapped_len;
 892         }
 893
 894         return 0;
 895 }
 896
 897 static __rte_always_inline void
 898 sync_mbuf_to_desc_seg(struct virtio_net *dev, struct vhost_virtqueue *vq,
 899                 struct rte_mbuf *m, uint32_t mbuf_offset,
 900                 uint64_t buf_addr, uint64_t buf_iova, uint32_t cpy_len)
 901 {
 902         struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
 903
 904         if (likely(cpy_len > MAX_BATCH_LEN || vq->batch_copy_nb_elems >= vq->size)) {
 905                 rte_memcpy((void *)((uintptr_t)(buf_addr)),
 906                                 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
 907                                 cpy_len);
 908                 vhost_log_cache_write_iova(dev, vq, buf_iova, cpy_len);
 909                 PRINT_PACKET(dev, (uintptr_t)(buf_addr), cpy_len, 0);
 910         } else {
 911                 batch_copy[vq->batch_copy_nb_elems].dst =
 912                         (void *)((uintptr_t)(buf_addr));
 913                 batch_copy[vq->batch_copy_nb_elems].src =
 914                         rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
 915                 batch_copy[vq->batch_copy_nb_elems].log_addr = buf_iova;
 916                 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
 917                 vq->batch_copy_nb_elems++;
 918         }
 919 }
 920
 921 static __rte_always_inline int
 922 mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
 923                 struct rte_mbuf *m, struct buf_vector *buf_vec,
 924                 uint16_t nr_vec, uint16_t num_buffers, bool is_async)
 925 {
 926         uint32_t vec_idx = 0;
 927         uint32_t mbuf_offset, mbuf_avail;
 928         uint32_t buf_offset, buf_avail;
 929         uint64_t buf_addr, buf_iova, buf_len;
 930         uint32_t cpy_len;
 931         uint64_t hdr_addr;
 932         struct rte_mbuf *hdr_mbuf;
 933         struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
 934         struct vhost_async *async = vq->async;
 935
 936         if (unlikely(m == NULL))
 937                 return -1;
 938
 939         buf_addr = buf_vec[vec_idx].buf_addr;
 940         buf_iova = buf_vec[vec_idx].buf_iova;
 941         buf_len = buf_vec[vec_idx].buf_len;
 942
 943         if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1))
 944                 return -1;
 945
 946         hdr_mbuf = m;
 947         hdr_addr = buf_addr;
 948         if (unlikely(buf_len < dev->vhost_hlen)) {
 949                 memset(&tmp_hdr, 0, sizeof(struct virtio_net_hdr_mrg_rxbuf));
 950                 hdr = &tmp_hdr;
 951         } else
 952                 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
 953
 954         VHOST_LOG_DATA(DEBUG, "(%d) RX: num merge buffers %d\n",
 955                 dev->vid, num_buffers);
 956
 957         if (unlikely(buf_len < dev->vhost_hlen)) {
 958                 buf_offset = dev->vhost_hlen - buf_len;
 959                 vec_idx++;
 960                 buf_addr = buf_vec[vec_idx].buf_addr;
 961                 buf_iova = buf_vec[vec_idx].buf_iova;
 962                 buf_len = buf_vec[vec_idx].buf_len;
 963                 buf_avail = buf_len - buf_offset;
 964         } else {
 965                 buf_offset = dev->vhost_hlen;
 966                 buf_avail = buf_len - dev->vhost_hlen;
 967         }
 968
 969         mbuf_avail  = rte_pktmbuf_data_len(m);
 970         mbuf_offset = 0;
 971
 972         if (is_async) {
 973                 if (async_iter_initialize(async))
 974                         return -1;
 975         }
 976
 977         while (mbuf_avail != 0 || m->next != NULL) {
 978                 /* done with current buf, get the next one */
 979                 if (buf_avail == 0) {
 980                         vec_idx++;
 981                         if (unlikely(vec_idx >= nr_vec))
 982                                 goto error;
 983
 984                         buf_addr = buf_vec[vec_idx].buf_addr;
 985                         buf_iova = buf_vec[vec_idx].buf_iova;
 986                         buf_len = buf_vec[vec_idx].buf_len;
 987
 988                         buf_offset = 0;
 989                         buf_avail  = buf_len;
 990                 }
 991
 992                 /* done with current mbuf, get the next one */
 993                 if (mbuf_avail == 0) {
 994                         m = m->next;
 995
 996                         mbuf_offset = 0;
 997                         mbuf_avail  = rte_pktmbuf_data_len(m);
 998                 }
 999
1000                 if (hdr_addr) {
1001                         virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
1002                         if (rxvq_is_mergeable(dev))
1003                                 ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
1004                                                 num_buffers);
1005
1006                         if (unlikely(hdr == &tmp_hdr)) {
1007                                 copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
1008                         } else {
1009                                 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
1010                                                 dev->vhost_hlen, 0);
1011                                 vhost_log_cache_write_iova(dev, vq,
1012                                                 buf_vec[0].buf_iova,
1013                                                 dev->vhost_hlen);
1014                         }
1015
1016                         hdr_addr = 0;
1017                 }
1018
1019                 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
1020
1021                 if (is_async) {
1022                         if (async_mbuf_to_desc_seg(dev, vq, m, mbuf_offset,
1023                                                 buf_iova + buf_offset, cpy_len) < 0)
1024                                 goto error;
1025                 } else {
1026                         sync_mbuf_to_desc_seg(dev, vq, m, mbuf_offset,
1027                                         buf_addr + buf_offset,
1028                                         buf_iova + buf_offset, cpy_len);
1029                 }
1030
1031                 mbuf_avail  -= cpy_len;
1032                 mbuf_offset += cpy_len;
1033                 buf_avail  -= cpy_len;
1034                 buf_offset += cpy_len;
1035         }
1036
1037         if (is_async)
1038                 async_iter_finalize(async);
1039
1040         return 0;
1041 error:
1042         if (is_async)
1043                 async_iter_cancel(async);
1044
1045         return -1;
1046 }
1047
1048 static __rte_always_inline int
1049 vhost_enqueue_single_packed(struct virtio_net *dev,
1050                             struct vhost_virtqueue *vq,
1051                             struct rte_mbuf *pkt,
1052                             struct buf_vector *buf_vec,
1053                             uint16_t *nr_descs)
1054 {
1055         uint16_t nr_vec = 0;
1056         uint16_t avail_idx = vq->last_avail_idx;
1057         uint16_t max_tries, tries = 0;
1058         uint16_t buf_id = 0;
1059         uint32_t len = 0;
1060         uint16_t desc_count;
1061         uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
1062         uint16_t num_buffers = 0;
1063         uint32_t buffer_len[vq->size];
1064         uint16_t buffer_buf_id[vq->size];
1065         uint16_t buffer_desc_count[vq->size];
1066
1067         if (rxvq_is_mergeable(dev))
1068                 max_tries = vq->size - 1;
1069         else
1070                 max_tries = 1;
1071
1072         while (size > 0) {
1073                 /*
1074                  * if we tried all available ring items, and still
1075                  * can't get enough buf, it means something abnormal
1076                  * happened.
1077                  */
1078                 if (unlikely(++tries > max_tries))
1079                         return -1;
1080
1081                 if (unlikely(fill_vec_buf_packed(dev, vq,
1082                                                 avail_idx, &desc_count,
1083                                                 buf_vec, &nr_vec,
1084                                                 &buf_id, &len,
1085                                                 VHOST_ACCESS_RW) < 0))
1086                         return -1;
1087
1088                 len = RTE_MIN(len, size);
1089                 size -= len;
1090
1091                 buffer_len[num_buffers] = len;
1092                 buffer_buf_id[num_buffers] = buf_id;
1093                 buffer_desc_count[num_buffers] = desc_count;
1094                 num_buffers += 1;
1095
1096                 *nr_descs += desc_count;
1097                 avail_idx += desc_count;
1098                 if (avail_idx >= vq->size)
1099                         avail_idx -= vq->size;
1100         }
1101
1102         if (mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, num_buffers, false) < 0)
1103                 return -1;
1104
1105         vhost_shadow_enqueue_single_packed(dev, vq, buffer_len, buffer_buf_id,
1106                                            buffer_desc_count, num_buffers);
1107
1108         return 0;
1109 }
1110
1111 static __rte_noinline uint32_t
1112 virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
1113         struct rte_mbuf **pkts, uint32_t count)
1114 {
1115         uint32_t pkt_idx = 0;
1116         uint16_t num_buffers;
1117         struct buf_vector buf_vec[BUF_VECTOR_MAX];
1118         uint16_t avail_head;
1119
1120         /*
1121          * The ordering between avail index and
1122          * desc reads needs to be enforced.
1123          */
1124         avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
1125
1126         rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1127
1128         for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1129                 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1130                 uint16_t nr_vec = 0;
1131
1132                 if (unlikely(reserve_avail_buf_split(dev, vq,
1133                                                 pkt_len, buf_vec, &num_buffers,
1134                                                 avail_head, &nr_vec) < 0)) {
1135                         VHOST_LOG_DATA(DEBUG,
1136                                 "(%d) failed to get enough desc from vring\n",
1137                                 dev->vid);
1138                         vq->shadow_used_idx -= num_buffers;
1139                         break;
1140                 }
1141
1142                 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1143                         dev->vid, vq->last_avail_idx,
1144                         vq->last_avail_idx + num_buffers);
1145
1146                 if (mbuf_to_desc(dev, vq, pkts[pkt_idx], buf_vec, nr_vec,
1147                                         num_buffers, false) < 0) {
1148                         vq->shadow_used_idx -= num_buffers;
1149                         break;
1150                 }
1151
1152                 vq->last_avail_idx += num_buffers;
1153         }
1154
1155         do_data_copy_enqueue(dev, vq);
1156
1157         if (likely(vq->shadow_used_idx)) {
1158                 flush_shadow_used_ring_split(dev, vq);
1159                 vhost_vring_call_split(dev, vq);
1160         }
1161
1162         return pkt_idx;
1163 }
1164
1165 static __rte_always_inline int
1166 virtio_dev_rx_sync_batch_check(struct virtio_net *dev,
1167                            struct vhost_virtqueue *vq,
1168                            struct rte_mbuf **pkts,
1169                            uint64_t *desc_addrs,
1170                            uint64_t *lens)
1171 {
1172         bool wrap_counter = vq->avail_wrap_counter;
1173         struct vring_packed_desc *descs = vq->desc_packed;
1174         uint16_t avail_idx = vq->last_avail_idx;
1175         uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1176         uint16_t i;
1177
1178         if (unlikely(avail_idx & PACKED_BATCH_MASK))
1179                 return -1;
1180
1181         if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
1182                 return -1;
1183
1184         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1185                 if (unlikely(pkts[i]->next != NULL))
1186                         return -1;
1187                 if (unlikely(!desc_is_avail(&descs[avail_idx + i],
1188                                             wrap_counter)))
1189                         return -1;
1190         }
1191
1192         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1193                 lens[i] = descs[avail_idx + i].len;
1194
1195         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1196                 if (unlikely(pkts[i]->pkt_len > (lens[i] - buf_offset)))
1197                         return -1;
1198         }
1199
1200         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1201                 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
1202                                                   descs[avail_idx + i].addr,
1203                                                   &lens[i],
1204                                                   VHOST_ACCESS_RW);
1205
1206         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1207                 if (unlikely(!desc_addrs[i]))
1208                         return -1;
1209                 if (unlikely(lens[i] != descs[avail_idx + i].len))
1210                         return -1;
1211         }
1212
1213         return 0;
1214 }
1215
1216 static __rte_always_inline void
1217 virtio_dev_rx_batch_packed_copy(struct virtio_net *dev,
1218                            struct vhost_virtqueue *vq,
1219                            struct rte_mbuf **pkts,
1220                            uint64_t *desc_addrs,
1221                            uint64_t *lens)
1222 {
1223         uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1224         struct virtio_net_hdr_mrg_rxbuf *hdrs[PACKED_BATCH_SIZE];
1225         struct vring_packed_desc *descs = vq->desc_packed;
1226         uint16_t avail_idx = vq->last_avail_idx;
1227         uint16_t ids[PACKED_BATCH_SIZE];
1228         uint16_t i;
1229
1230         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1231                 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
1232                 hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)
1233                                         (uintptr_t)desc_addrs[i];
1234                 lens[i] = pkts[i]->pkt_len +
1235                         sizeof(struct virtio_net_hdr_mrg_rxbuf);
1236         }
1237
1238         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1239                 virtio_enqueue_offload(pkts[i], &hdrs[i]->hdr);
1240
1241         vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
1242
1243         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1244                 rte_memcpy((void *)(uintptr_t)(desc_addrs[i] + buf_offset),
1245                            rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
1246                            pkts[i]->pkt_len);
1247         }
1248
1249         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1250                 vhost_log_cache_write_iova(dev, vq, descs[avail_idx + i].addr,
1251                                            lens[i]);
1252
1253         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1254                 ids[i] = descs[avail_idx + i].id;
1255
1256         vhost_flush_enqueue_batch_packed(dev, vq, lens, ids);
1257 }
1258
1259 static __rte_always_inline int
1260 virtio_dev_rx_sync_batch_packed(struct virtio_net *dev,
1261                            struct vhost_virtqueue *vq,
1262                            struct rte_mbuf **pkts)
1263 {
1264         uint64_t desc_addrs[PACKED_BATCH_SIZE];
1265         uint64_t lens[PACKED_BATCH_SIZE];
1266
1267         if (virtio_dev_rx_sync_batch_check(dev, vq, pkts, desc_addrs, lens) == -1)
1268                 return -1;
1269
1270         if (vq->shadow_used_idx) {
1271                 do_data_copy_enqueue(dev, vq);
1272                 vhost_flush_enqueue_shadow_packed(dev, vq);
1273         }
1274
1275         virtio_dev_rx_batch_packed_copy(dev, vq, pkts, desc_addrs, lens);
1276
1277         return 0;
1278 }
1279
1280 static __rte_always_inline int16_t
1281 virtio_dev_rx_single_packed(struct virtio_net *dev,
1282                             struct vhost_virtqueue *vq,
1283                             struct rte_mbuf *pkt)
1284 {
1285         struct buf_vector buf_vec[BUF_VECTOR_MAX];
1286         uint16_t nr_descs = 0;
1287
1288         if (unlikely(vhost_enqueue_single_packed(dev, vq, pkt, buf_vec,
1289                                                  &nr_descs) < 0)) {
1290                 VHOST_LOG_DATA(DEBUG,
1291                                 "(%d) failed to get enough desc from vring\n",
1292                                 dev->vid);
1293                 return -1;
1294         }
1295
1296         VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1297                         dev->vid, vq->last_avail_idx,
1298                         vq->last_avail_idx + nr_descs);
1299
1300         vq_inc_last_avail_packed(vq, nr_descs);
1301
1302         return 0;
1303 }
1304
1305 static __rte_noinline uint32_t
1306 virtio_dev_rx_packed(struct virtio_net *dev,
1307                      struct vhost_virtqueue *__rte_restrict vq,
1308                      struct rte_mbuf **__rte_restrict pkts,
1309                      uint32_t count)
1310 {
1311         uint32_t pkt_idx = 0;
1312
1313         do {
1314                 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
1315
1316                 if (count - pkt_idx >= PACKED_BATCH_SIZE) {
1317                         if (!virtio_dev_rx_sync_batch_packed(dev, vq,
1318                                                         &pkts[pkt_idx])) {
1319                                 pkt_idx += PACKED_BATCH_SIZE;
1320                                 continue;
1321                         }
1322                 }
1323
1324                 if (virtio_dev_rx_single_packed(dev, vq, pkts[pkt_idx]))
1325                         break;
1326                 pkt_idx++;
1327
1328         } while (pkt_idx < count);
1329
1330         if (vq->shadow_used_idx) {
1331                 do_data_copy_enqueue(dev, vq);
1332                 vhost_flush_enqueue_shadow_packed(dev, vq);
1333         }
1334
1335         if (pkt_idx)
1336                 vhost_vring_call_packed(dev, vq);
1337
1338         return pkt_idx;
1339 }
1340
1341 static __rte_always_inline uint32_t
1342 virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
1343         struct rte_mbuf **pkts, uint32_t count)
1344 {
1345         struct vhost_virtqueue *vq;
1346         uint32_t nb_tx = 0;
1347
1348         VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1349         if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1350                 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1351                         dev->vid, __func__, queue_id);
1352                 return 0;
1353         }
1354
1355         vq = dev->virtqueue[queue_id];
1356
1357         rte_spinlock_lock(&vq->access_lock);
1358
1359         if (unlikely(!vq->enabled))
1360                 goto out_access_unlock;
1361
1362         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1363                 vhost_user_iotlb_rd_lock(vq);
1364
1365         if (unlikely(!vq->access_ok))
1366                 if (unlikely(vring_translate(dev, vq) < 0))
1367                         goto out;
1368
1369         count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
1370         if (count == 0)
1371                 goto out;
1372
1373         if (vq_is_packed(dev))
1374                 nb_tx = virtio_dev_rx_packed(dev, vq, pkts, count);
1375         else
1376                 nb_tx = virtio_dev_rx_split(dev, vq, pkts, count);
1377
1378 out:
1379         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1380                 vhost_user_iotlb_rd_unlock(vq);
1381
1382 out_access_unlock:
1383         rte_spinlock_unlock(&vq->access_lock);
1384
1385         return nb_tx;
1386 }
1387
1388 uint16_t
1389 rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
1390         struct rte_mbuf **__rte_restrict pkts, uint16_t count)
1391 {
1392         struct virtio_net *dev = get_device(vid);
1393
1394         if (!dev)
1395                 return 0;
1396
1397         if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
1398                 VHOST_LOG_DATA(ERR,
1399                         "(%d) %s: built-in vhost net backend is disabled.\n",
1400                         dev->vid, __func__);
1401                 return 0;
1402         }
1403
1404         return virtio_dev_rx(dev, queue_id, pkts, count);
1405 }
1406
1407 static __rte_always_inline uint16_t
1408 async_get_first_inflight_pkt_idx(struct vhost_virtqueue *vq)
1409 {
1410         struct vhost_async *async = vq->async;
1411
1412         if (async->pkts_idx >= async->pkts_inflight_n)
1413                 return async->pkts_idx - async->pkts_inflight_n;
1414         else
1415                 return vq->size - async->pkts_inflight_n + async->pkts_idx;
1416 }
1417
1418 static __rte_always_inline void
1419 store_dma_desc_info_split(struct vring_used_elem *s_ring, struct vring_used_elem *d_ring,
1420                 uint16_t ring_size, uint16_t s_idx, uint16_t d_idx, uint16_t count)
1421 {
1422         size_t elem_size = sizeof(struct vring_used_elem);
1423
1424         if (d_idx + count <= ring_size) {
1425                 rte_memcpy(d_ring + d_idx, s_ring + s_idx, count * elem_size);
1426         } else {
1427                 uint16_t size = ring_size - d_idx;
1428
1429                 rte_memcpy(d_ring + d_idx, s_ring + s_idx, size * elem_size);
1430                 rte_memcpy(d_ring, s_ring + s_idx + size, (count - size) * elem_size);
1431         }
1432 }
1433
1434 static __rte_always_inline void
1435 store_dma_desc_info_packed(struct vring_used_elem_packed *s_ring,
1436                 struct vring_used_elem_packed *d_ring,
1437                 uint16_t ring_size, uint16_t s_idx, uint16_t d_idx, uint16_t count)
1438 {
1439         size_t elem_size = sizeof(struct vring_used_elem_packed);
1440
1441         if (d_idx + count <= ring_size) {
1442                 rte_memcpy(d_ring + d_idx, s_ring + s_idx, count * elem_size);
1443         } else {
1444                 uint16_t size = ring_size - d_idx;
1445
1446                 rte_memcpy(d_ring + d_idx, s_ring + s_idx, size * elem_size);
1447                 rte_memcpy(d_ring, s_ring + s_idx + size, (count - size) * elem_size);
1448         }
1449 }
1450
1451 static __rte_noinline uint32_t
1452 virtio_dev_rx_async_submit_split(struct virtio_net *dev,
1453         struct vhost_virtqueue *vq, uint16_t queue_id,
1454         struct rte_mbuf **pkts, uint32_t count)
1455 {
1456         struct buf_vector buf_vec[BUF_VECTOR_MAX];
1457         uint32_t pkt_idx = 0;
1458         uint16_t num_buffers;
1459         uint16_t avail_head;
1460
1461         struct vhost_async *async = vq->async;
1462         struct async_inflight_info *pkts_info = async->pkts_info;
1463         uint32_t pkt_err = 0;
1464         int32_t n_xfer;
1465         uint16_t slot_idx = 0;
1466
1467         /*
1468          * The ordering between avail index and desc reads need to be enforced.
1469          */
1470         avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
1471
1472         rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1473
1474         async_iter_reset(async);
1475
1476         for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1477                 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1478                 uint16_t nr_vec = 0;
1479
1480                 if (unlikely(reserve_avail_buf_split(dev, vq, pkt_len, buf_vec,
1481                                                 &num_buffers, avail_head, &nr_vec) < 0)) {
1482                         VHOST_LOG_DATA(DEBUG, "(%d) failed to get enough desc from vring\n",
1483                                         dev->vid);
1484                         vq->shadow_used_idx -= num_buffers;
1485                         break;
1486                 }
1487
1488                 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1489                         dev->vid, vq->last_avail_idx, vq->last_avail_idx + num_buffers);
1490
1491                 if (mbuf_to_desc(dev, vq, pkts[pkt_idx], buf_vec, nr_vec, num_buffers, true) < 0) {
1492                         vq->shadow_used_idx -= num_buffers;
1493                         break;
1494                 }
1495
1496                 slot_idx = (async->pkts_idx + pkt_idx) & (vq->size - 1);
1497                 pkts_info[slot_idx].descs = num_buffers;
1498                 pkts_info[slot_idx].mbuf = pkts[pkt_idx];
1499
1500                 vq->last_avail_idx += num_buffers;
1501         }
1502
1503         if (unlikely(pkt_idx == 0))
1504                 return 0;
1505
1506         n_xfer = async->ops.transfer_data(dev->vid, queue_id, async->iov_iter, 0, pkt_idx);
1507         if (unlikely(n_xfer < 0)) {
1508                 VHOST_LOG_DATA(ERR, "(%d) %s: failed to transfer data for queue id %d.\n",
1509                                 dev->vid, __func__, queue_id);
1510                 n_xfer = 0;
1511         }
1512
1513         pkt_err = pkt_idx - n_xfer;
1514         if (unlikely(pkt_err)) {
1515                 uint16_t num_descs = 0;
1516
1517                 /* update number of completed packets */
1518                 pkt_idx = n_xfer;
1519
1520                 /* calculate the sum of descriptors to revert */
1521                 while (pkt_err-- > 0) {
1522                         num_descs += pkts_info[slot_idx & (vq->size - 1)].descs;
1523                         slot_idx--;
1524                 }
1525
1526                 /* recover shadow used ring and available ring */
1527                 vq->shadow_used_idx -= num_descs;
1528                 vq->last_avail_idx -= num_descs;
1529         }
1530
1531         /* keep used descriptors */
1532         if (likely(vq->shadow_used_idx)) {
1533                 uint16_t to = async->desc_idx_split & (vq->size - 1);
1534
1535                 store_dma_desc_info_split(vq->shadow_used_split,
1536                                 async->descs_split, vq->size, 0, to,
1537                                 vq->shadow_used_idx);
1538
1539                 async->desc_idx_split += vq->shadow_used_idx;
1540
1541                 async->pkts_idx += pkt_idx;
1542                 if (async->pkts_idx >= vq->size)
1543                         async->pkts_idx -= vq->size;
1544
1545                 async->pkts_inflight_n += pkt_idx;
1546                 vq->shadow_used_idx = 0;
1547         }
1548
1549         return pkt_idx;
1550 }
1551
1552
1553 static __rte_always_inline int
1554 vhost_enqueue_async_packed(struct virtio_net *dev,
1555                             struct vhost_virtqueue *vq,
1556                             struct rte_mbuf *pkt,
1557                             struct buf_vector *buf_vec,
1558                             uint16_t *nr_descs,
1559                             uint16_t *nr_buffers)
1560 {
1561         uint16_t nr_vec = 0;
1562         uint16_t avail_idx = vq->last_avail_idx;
1563         uint16_t max_tries, tries = 0;
1564         uint16_t buf_id = 0;
1565         uint32_t len = 0;
1566         uint16_t desc_count = 0;
1567         uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
1568         uint32_t buffer_len[vq->size];
1569         uint16_t buffer_buf_id[vq->size];
1570         uint16_t buffer_desc_count[vq->size];
1571
1572         if (rxvq_is_mergeable(dev))
1573                 max_tries = vq->size - 1;
1574         else
1575                 max_tries = 1;
1576
1577         while (size > 0) {
1578                 /*
1579                  * if we tried all available ring items, and still
1580                  * can't get enough buf, it means something abnormal
1581                  * happened.
1582                  */
1583                 if (unlikely(++tries > max_tries))
1584                         return -1;
1585
1586                 if (unlikely(fill_vec_buf_packed(dev, vq,
1587                                                 avail_idx, &desc_count,
1588                                                 buf_vec, &nr_vec,
1589                                                 &buf_id, &len,
1590                                                 VHOST_ACCESS_RW) < 0))
1591                         return -1;
1592
1593                 len = RTE_MIN(len, size);
1594                 size -= len;
1595
1596                 buffer_len[*nr_buffers] = len;
1597                 buffer_buf_id[*nr_buffers] = buf_id;
1598                 buffer_desc_count[*nr_buffers] = desc_count;
1599                 *nr_buffers += 1;
1600                 *nr_descs += desc_count;
1601                 avail_idx += desc_count;
1602                 if (avail_idx >= vq->size)
1603                         avail_idx -= vq->size;
1604         }
1605
1606         if (unlikely(mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, *nr_buffers, true) < 0))
1607                 return -1;
1608
1609         vhost_shadow_enqueue_packed(vq, buffer_len, buffer_buf_id, buffer_desc_count, *nr_buffers);
1610
1611         return 0;
1612 }
1613
1614 static __rte_always_inline int16_t
1615 virtio_dev_rx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
1616                             struct rte_mbuf *pkt, uint16_t *nr_descs, uint16_t *nr_buffers)
1617 {
1618         struct buf_vector buf_vec[BUF_VECTOR_MAX];
1619
1620         if (unlikely(vhost_enqueue_async_packed(dev, vq, pkt, buf_vec,
1621                                         nr_descs, nr_buffers) < 0)) {
1622                 VHOST_LOG_DATA(DEBUG, "(%d) failed to get enough desc from vring\n", dev->vid);
1623                 return -1;
1624         }
1625
1626         VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1627                         dev->vid, vq->last_avail_idx, vq->last_avail_idx + *nr_descs);
1628
1629         return 0;
1630 }
1631
1632 static __rte_always_inline void
1633 dma_error_handler_packed(struct vhost_virtqueue *vq, uint16_t slot_idx,
1634                         uint32_t nr_err, uint32_t *pkt_idx)
1635 {
1636         uint16_t descs_err = 0;
1637         uint16_t buffers_err = 0;
1638         struct async_inflight_info *pkts_info = vq->async->pkts_info;
1639
1640         *pkt_idx -= nr_err;
1641         /* calculate the sum of buffers and descs of DMA-error packets. */
1642         while (nr_err-- > 0) {
1643                 descs_err += pkts_info[slot_idx % vq->size].descs;
1644                 buffers_err += pkts_info[slot_idx % vq->size].nr_buffers;
1645                 slot_idx--;
1646         }
1647
1648         if (vq->last_avail_idx >= descs_err) {
1649                 vq->last_avail_idx -= descs_err;
1650         } else {
1651                 vq->last_avail_idx = vq->last_avail_idx + vq->size - descs_err;
1652                 vq->avail_wrap_counter ^= 1;
1653         }
1654
1655         vq->shadow_used_idx -= buffers_err;
1656 }
1657
1658 static __rte_noinline uint32_t
1659 virtio_dev_rx_async_submit_packed(struct virtio_net *dev,
1660         struct vhost_virtqueue *vq, uint16_t queue_id,
1661         struct rte_mbuf **pkts, uint32_t count)
1662 {
1663         uint32_t pkt_idx = 0;
1664         uint32_t remained = count;
1665         int32_t n_xfer;
1666         uint16_t num_buffers;
1667         uint16_t num_descs;
1668
1669         struct vhost_async *async = vq->async;
1670         struct async_inflight_info *pkts_info = async->pkts_info;
1671         uint32_t pkt_err = 0;
1672         uint16_t slot_idx = 0;
1673
1674         do {
1675                 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
1676
1677                 num_buffers = 0;
1678                 num_descs = 0;
1679                 if (unlikely(virtio_dev_rx_async_packed(dev, vq, pkts[pkt_idx],
1680                                                 &num_descs, &num_buffers) < 0))
1681                         break;
1682
1683                 slot_idx = (async->pkts_idx + pkt_idx) % vq->size;
1684
1685                 pkts_info[slot_idx].descs = num_descs;
1686                 pkts_info[slot_idx].nr_buffers = num_buffers;
1687                 pkts_info[slot_idx].mbuf = pkts[pkt_idx];
1688
1689                 pkt_idx++;
1690                 remained--;
1691                 vq_inc_last_avail_packed(vq, num_descs);
1692         } while (pkt_idx < count);
1693
1694         if (unlikely(pkt_idx == 0))
1695                 return 0;
1696
1697         n_xfer = async->ops.transfer_data(dev->vid, queue_id, async->iov_iter, 0, pkt_idx);
1698         if (unlikely(n_xfer < 0)) {
1699                 VHOST_LOG_DATA(ERR, "(%d) %s: failed to transfer data for queue id %d.\n",
1700                                 dev->vid, __func__, queue_id);
1701                 n_xfer = 0;
1702         }
1703
1704         pkt_err = pkt_idx - n_xfer;
1705
1706         async_iter_reset(async);
1707
1708         if (unlikely(pkt_err))
1709                 dma_error_handler_packed(vq, slot_idx, pkt_err, &pkt_idx);
1710
1711         if (likely(vq->shadow_used_idx)) {
1712                 /* keep used descriptors. */
1713                 store_dma_desc_info_packed(vq->shadow_used_packed, async->buffers_packed,
1714                                         vq->size, 0, async->buffer_idx_packed,
1715                                         vq->shadow_used_idx);
1716
1717                 async->buffer_idx_packed += vq->shadow_used_idx;
1718                 if (async->buffer_idx_packed >= vq->size)
1719                         async->buffer_idx_packed -= vq->size;
1720
1721                 async->pkts_idx += pkt_idx;
1722                 if (async->pkts_idx >= vq->size)
1723                         async->pkts_idx -= vq->size;
1724
1725                 vq->shadow_used_idx = 0;
1726                 async->pkts_inflight_n += pkt_idx;
1727         }
1728
1729         return pkt_idx;
1730 }
1731
1732 static __rte_always_inline void
1733 write_back_completed_descs_split(struct vhost_virtqueue *vq, uint16_t n_descs)
1734 {
1735         struct vhost_async *async = vq->async;
1736         uint16_t nr_left = n_descs;
1737         uint16_t nr_copy;
1738         uint16_t to, from;
1739
1740         do {
1741                 from = async->last_desc_idx_split & (vq->size - 1);
1742                 nr_copy = nr_left + from <= vq->size ? nr_left : vq->size - from;
1743                 to = vq->last_used_idx & (vq->size - 1);
1744
1745                 if (to + nr_copy <= vq->size) {
1746                         rte_memcpy(&vq->used->ring[to], &async->descs_split[from],
1747                                         nr_copy * sizeof(struct vring_used_elem));
1748                 } else {
1749                         uint16_t size = vq->size - to;
1750
1751                         rte_memcpy(&vq->used->ring[to], &async->descs_split[from],
1752                                         size * sizeof(struct vring_used_elem));
1753                         rte_memcpy(&vq->used->ring[0], &async->descs_split[from + size],
1754                                         (nr_copy - size) * sizeof(struct vring_used_elem));
1755                 }
1756
1757                 async->last_desc_idx_split += nr_copy;
1758                 vq->last_used_idx += nr_copy;
1759                 nr_left -= nr_copy;
1760         } while (nr_left > 0);
1761 }
1762
1763 static __rte_always_inline void
1764 write_back_completed_descs_packed(struct vhost_virtqueue *vq,
1765                                 uint16_t n_buffers)
1766 {
1767         struct vhost_async *async = vq->async;
1768         uint16_t from = async->last_buffer_idx_packed;
1769         uint16_t used_idx = vq->last_used_idx;
1770         uint16_t head_idx = vq->last_used_idx;
1771         uint16_t head_flags = 0;
1772         uint16_t i;
1773
1774         /* Split loop in two to save memory barriers */
1775         for (i = 0; i < n_buffers; i++) {
1776                 vq->desc_packed[used_idx].id = async->buffers_packed[from].id;
1777                 vq->desc_packed[used_idx].len = async->buffers_packed[from].len;
1778
1779                 used_idx += async->buffers_packed[from].count;
1780                 if (used_idx >= vq->size)
1781                         used_idx -= vq->size;
1782
1783                 from++;
1784                 if (from >= vq->size)
1785                         from = 0;
1786         }
1787
1788         /* The ordering for storing desc flags needs to be enforced. */
1789         rte_atomic_thread_fence(__ATOMIC_RELEASE);
1790
1791         from = async->last_buffer_idx_packed;
1792
1793         for (i = 0; i < n_buffers; i++) {
1794                 uint16_t flags;
1795
1796                 if (async->buffers_packed[from].len)
1797                         flags = VRING_DESC_F_WRITE;
1798                 else
1799                         flags = 0;
1800
1801                 if (vq->used_wrap_counter) {
1802                         flags |= VRING_DESC_F_USED;
1803                         flags |= VRING_DESC_F_AVAIL;
1804                 } else {
1805                         flags &= ~VRING_DESC_F_USED;
1806                         flags &= ~VRING_DESC_F_AVAIL;
1807                 }
1808
1809                 if (i > 0) {
1810                         vq->desc_packed[vq->last_used_idx].flags = flags;
1811                 } else {
1812                         head_idx = vq->last_used_idx;
1813                         head_flags = flags;
1814                 }
1815
1816                 vq_inc_last_used_packed(vq, async->buffers_packed[from].count);
1817
1818                 from++;
1819                 if (from == vq->size)
1820                         from = 0;
1821         }
1822
1823         vq->desc_packed[head_idx].flags = head_flags;
1824         async->last_buffer_idx_packed = from;
1825 }
1826
1827 static __rte_always_inline uint16_t
1828 vhost_poll_enqueue_completed(struct virtio_net *dev, uint16_t queue_id,
1829                 struct rte_mbuf **pkts, uint16_t count)
1830 {
1831         struct vhost_virtqueue *vq = dev->virtqueue[queue_id];
1832         struct vhost_async *async = vq->async;
1833         struct async_inflight_info *pkts_info = async->pkts_info;
1834         int32_t n_cpl;
1835         uint16_t n_descs = 0, n_buffers = 0;
1836         uint16_t start_idx, from, i;
1837
1838         n_cpl = async->ops.check_completed_copies(dev->vid, queue_id, 0, count);
1839         if (unlikely(n_cpl < 0)) {
1840                 VHOST_LOG_DATA(ERR, "(%d) %s: failed to check completed copies for queue id %d.\n",
1841                                 dev->vid, __func__, queue_id);
1842                 return 0;
1843         }
1844
1845         if (n_cpl == 0)
1846                 return 0;
1847
1848         start_idx = async_get_first_inflight_pkt_idx(vq);
1849
1850         for (i = 0; i < n_cpl; i++) {
1851                 from = (start_idx + i) % vq->size;
1852                 /* Only used with packed ring */
1853                 n_buffers += pkts_info[from].nr_buffers;
1854                 /* Only used with split ring */
1855                 n_descs += pkts_info[from].descs;
1856                 pkts[i] = pkts_info[from].mbuf;
1857         }
1858
1859         async->pkts_inflight_n -= n_cpl;
1860
1861         if (likely(vq->enabled && vq->access_ok)) {
1862                 if (vq_is_packed(dev)) {
1863                         write_back_completed_descs_packed(vq, n_buffers);
1864                         vhost_vring_call_packed(dev, vq);
1865                 } else {
1866                         write_back_completed_descs_split(vq, n_descs);
1867                         __atomic_add_fetch(&vq->used->idx, n_descs, __ATOMIC_RELEASE);
1868                         vhost_vring_call_split(dev, vq);
1869                 }
1870         } else {
1871                 if (vq_is_packed(dev)) {
1872                         async->last_buffer_idx_packed += n_buffers;
1873                         if (async->last_buffer_idx_packed >= vq->size)
1874                                 async->last_buffer_idx_packed -= vq->size;
1875                 } else {
1876                         async->last_desc_idx_split += n_descs;
1877                 }
1878         }
1879
1880         return n_cpl;
1881 }
1882
1883 uint16_t
1884 rte_vhost_poll_enqueue_completed(int vid, uint16_t queue_id,
1885                 struct rte_mbuf **pkts, uint16_t count)
1886 {
1887         struct virtio_net *dev = get_device(vid);
1888         struct vhost_virtqueue *vq;
1889         uint16_t n_pkts_cpl = 0;
1890
1891         if (unlikely(!dev))
1892                 return 0;
1893
1894         VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1895         if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1896                 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1897                         dev->vid, __func__, queue_id);
1898                 return 0;
1899         }
1900
1901         vq = dev->virtqueue[queue_id];
1902
1903         if (unlikely(!vq->async)) {
1904                 VHOST_LOG_DATA(ERR, "(%d) %s: async not registered for queue id %d.\n",
1905                         dev->vid, __func__, queue_id);
1906                 return 0;
1907         }
1908
1909         rte_spinlock_lock(&vq->access_lock);
1910
1911         n_pkts_cpl = vhost_poll_enqueue_completed(dev, queue_id, pkts, count);
1912
1913         rte_spinlock_unlock(&vq->access_lock);
1914
1915         return n_pkts_cpl;
1916 }
1917
1918 uint16_t
1919 rte_vhost_clear_queue_thread_unsafe(int vid, uint16_t queue_id,
1920                 struct rte_mbuf **pkts, uint16_t count)
1921 {
1922         struct virtio_net *dev = get_device(vid);
1923         struct vhost_virtqueue *vq;
1924         uint16_t n_pkts_cpl = 0;
1925
1926         if (!dev)
1927                 return 0;
1928
1929         VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1930         if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1931                 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1932                         dev->vid, __func__, queue_id);
1933                 return 0;
1934         }
1935
1936         vq = dev->virtqueue[queue_id];
1937
1938         if (unlikely(!vq->async)) {
1939                 VHOST_LOG_DATA(ERR, "(%d) %s: async not registered for queue id %d.\n",
1940                         dev->vid, __func__, queue_id);
1941                 return 0;
1942         }
1943
1944         n_pkts_cpl = vhost_poll_enqueue_completed(dev, queue_id, pkts, count);
1945
1946         return n_pkts_cpl;
1947 }
1948
1949 static __rte_always_inline uint32_t
1950 virtio_dev_rx_async_submit(struct virtio_net *dev, uint16_t queue_id,
1951         struct rte_mbuf **pkts, uint32_t count)
1952 {
1953         struct vhost_virtqueue *vq;
1954         uint32_t nb_tx = 0;
1955
1956         VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1957         if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1958                 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1959                         dev->vid, __func__, queue_id);
1960                 return 0;
1961         }
1962
1963         vq = dev->virtqueue[queue_id];
1964
1965         rte_spinlock_lock(&vq->access_lock);
1966
1967         if (unlikely(!vq->enabled || !vq->async))
1968                 goto out_access_unlock;
1969
1970         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1971                 vhost_user_iotlb_rd_lock(vq);
1972
1973         if (unlikely(!vq->access_ok))
1974                 if (unlikely(vring_translate(dev, vq) < 0))
1975                         goto out;
1976
1977         count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
1978         if (count == 0)
1979                 goto out;
1980
1981         if (vq_is_packed(dev))
1982                 nb_tx = virtio_dev_rx_async_submit_packed(dev, vq, queue_id,
1983                                 pkts, count);
1984         else
1985                 nb_tx = virtio_dev_rx_async_submit_split(dev, vq, queue_id,
1986                                 pkts, count);
1987
1988 out:
1989         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1990                 vhost_user_iotlb_rd_unlock(vq);
1991
1992 out_access_unlock:
1993         rte_spinlock_unlock(&vq->access_lock);
1994
1995         return nb_tx;
1996 }
1997
1998 uint16_t
1999 rte_vhost_submit_enqueue_burst(int vid, uint16_t queue_id,
2000                 struct rte_mbuf **pkts, uint16_t count)
2001 {
2002         struct virtio_net *dev = get_device(vid);
2003
2004         if (!dev)
2005                 return 0;
2006
2007         if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
2008                 VHOST_LOG_DATA(ERR,
2009                         "(%d) %s: built-in vhost net backend is disabled.\n",
2010                         dev->vid, __func__);
2011                 return 0;
2012         }
2013
2014         return virtio_dev_rx_async_submit(dev, queue_id, pkts, count);
2015 }
2016
2017 static inline bool
2018 virtio_net_with_host_offload(struct virtio_net *dev)
2019 {
2020         if (dev->features &
2021                         ((1ULL << VIRTIO_NET_F_CSUM) |
2022                          (1ULL << VIRTIO_NET_F_HOST_ECN) |
2023                          (1ULL << VIRTIO_NET_F_HOST_TSO4) |
2024                          (1ULL << VIRTIO_NET_F_HOST_TSO6) |
2025                          (1ULL << VIRTIO_NET_F_HOST_UFO)))
2026                 return true;
2027
2028         return false;
2029 }
2030
2031 static int
2032 parse_headers(struct rte_mbuf *m, uint8_t *l4_proto)
2033 {
2034         struct rte_ipv4_hdr *ipv4_hdr;
2035         struct rte_ipv6_hdr *ipv6_hdr;
2036         struct rte_ether_hdr *eth_hdr;
2037         uint16_t ethertype;
2038         uint16_t data_len = rte_pktmbuf_data_len(m);
2039
2040         if (data_len < sizeof(struct rte_ether_hdr))
2041                 return -EINVAL;
2042
2043         eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
2044
2045         m->l2_len = sizeof(struct rte_ether_hdr);
2046         ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
2047
2048         if (ethertype == RTE_ETHER_TYPE_VLAN) {
2049                 if (data_len < sizeof(struct rte_ether_hdr) +
2050                                 sizeof(struct rte_vlan_hdr))
2051                         goto error;
2052
2053                 struct rte_vlan_hdr *vlan_hdr =
2054                         (struct rte_vlan_hdr *)(eth_hdr + 1);
2055
2056                 m->l2_len += sizeof(struct rte_vlan_hdr);
2057                 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
2058         }
2059
2060         switch (ethertype) {
2061         case RTE_ETHER_TYPE_IPV4:
2062                 if (data_len < m->l2_len + sizeof(struct rte_ipv4_hdr))
2063                         goto error;
2064                 ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv4_hdr *,
2065                                 m->l2_len);
2066                 m->l3_len = rte_ipv4_hdr_len(ipv4_hdr);
2067                 if (data_len < m->l2_len + m->l3_len)
2068                         goto error;
2069                 m->ol_flags |= RTE_MBUF_F_TX_IPV4;
2070                 *l4_proto = ipv4_hdr->next_proto_id;
2071                 break;
2072         case RTE_ETHER_TYPE_IPV6:
2073                 if (data_len < m->l2_len + sizeof(struct rte_ipv6_hdr))
2074                         goto error;
2075                 ipv6_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv6_hdr *,
2076                                 m->l2_len);
2077                 m->l3_len = sizeof(struct rte_ipv6_hdr);
2078                 m->ol_flags |= RTE_MBUF_F_TX_IPV6;
2079                 *l4_proto = ipv6_hdr->proto;
2080                 break;
2081         default:
2082                 /* a valid L3 header is needed for further L4 parsing */
2083                 goto error;
2084         }
2085
2086         /* both CSUM and GSO need a valid L4 header */
2087         switch (*l4_proto) {
2088         case IPPROTO_TCP:
2089                 if (data_len < m->l2_len + m->l3_len +
2090                                 sizeof(struct rte_tcp_hdr))
2091                         goto error;
2092                 break;
2093         case IPPROTO_UDP:
2094                 if (data_len < m->l2_len + m->l3_len +
2095                                 sizeof(struct rte_udp_hdr))
2096                         goto error;
2097                 break;
2098         case IPPROTO_SCTP:
2099                 if (data_len < m->l2_len + m->l3_len +
2100                                 sizeof(struct rte_sctp_hdr))
2101                         goto error;
2102                 break;
2103         default:
2104                 goto error;
2105         }
2106
2107         return 0;
2108
2109 error:
2110         m->l2_len = 0;
2111         m->l3_len = 0;
2112         m->ol_flags = 0;
2113         return -EINVAL;
2114 }
2115
2116 static __rte_always_inline void
2117 vhost_dequeue_offload_legacy(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
2118 {
2119         uint8_t l4_proto = 0;
2120         struct rte_tcp_hdr *tcp_hdr = NULL;
2121         uint16_t tcp_len;
2122         uint16_t data_len = rte_pktmbuf_data_len(m);
2123
2124         if (parse_headers(m, &l4_proto) < 0)
2125                 return;
2126
2127         if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2128                 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
2129                         switch (hdr->csum_offset) {
2130                         case (offsetof(struct rte_tcp_hdr, cksum)):
2131                                 if (l4_proto != IPPROTO_TCP)
2132                                         goto error;
2133                                 m->ol_flags |= RTE_MBUF_F_TX_TCP_CKSUM;
2134                                 break;
2135                         case (offsetof(struct rte_udp_hdr, dgram_cksum)):
2136                                 if (l4_proto != IPPROTO_UDP)
2137                                         goto error;
2138                                 m->ol_flags |= RTE_MBUF_F_TX_UDP_CKSUM;
2139                                 break;
2140                         case (offsetof(struct rte_sctp_hdr, cksum)):
2141                                 if (l4_proto != IPPROTO_SCTP)
2142                                         goto error;
2143                                 m->ol_flags |= RTE_MBUF_F_TX_SCTP_CKSUM;
2144                                 break;
2145                         default:
2146                                 goto error;
2147                         }
2148                 } else {
2149                         goto error;
2150                 }
2151         }
2152
2153         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2154                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2155                 case VIRTIO_NET_HDR_GSO_TCPV4:
2156                 case VIRTIO_NET_HDR_GSO_TCPV6:
2157                         if (l4_proto != IPPROTO_TCP)
2158                                 goto error;
2159                         tcp_hdr = rte_pktmbuf_mtod_offset(m,
2160                                         struct rte_tcp_hdr *,
2161                                         m->l2_len + m->l3_len);
2162                         tcp_len = (tcp_hdr->data_off & 0xf0) >> 2;
2163                         if (data_len < m->l2_len + m->l3_len + tcp_len)
2164                                 goto error;
2165                         m->ol_flags |= RTE_MBUF_F_TX_TCP_SEG;
2166                         m->tso_segsz = hdr->gso_size;
2167                         m->l4_len = tcp_len;
2168                         break;
2169                 case VIRTIO_NET_HDR_GSO_UDP:
2170                         if (l4_proto != IPPROTO_UDP)
2171                                 goto error;
2172                         m->ol_flags |= RTE_MBUF_F_TX_UDP_SEG;
2173                         m->tso_segsz = hdr->gso_size;
2174                         m->l4_len = sizeof(struct rte_udp_hdr);
2175                         break;
2176                 default:
2177                         VHOST_LOG_DATA(WARNING,
2178                                 "unsupported gso type %u.\n", hdr->gso_type);
2179                         goto error;
2180                 }
2181         }
2182         return;
2183
2184 error:
2185         m->l2_len = 0;
2186         m->l3_len = 0;
2187         m->ol_flags = 0;
2188 }
2189
2190 static __rte_always_inline void
2191 vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m,
2192         bool legacy_ol_flags)
2193 {
2194         struct rte_net_hdr_lens hdr_lens;
2195         int l4_supported = 0;
2196         uint32_t ptype;
2197
2198         if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
2199                 return;
2200
2201         if (legacy_ol_flags) {
2202                 vhost_dequeue_offload_legacy(hdr, m);
2203                 return;
2204         }
2205
2206         m->ol_flags |= RTE_MBUF_F_RX_IP_CKSUM_UNKNOWN;
2207
2208         ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
2209         m->packet_type = ptype;
2210         if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
2211             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
2212             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
2213                 l4_supported = 1;
2214
2215         /* According to Virtio 1.1 spec, the device only needs to look at
2216          * VIRTIO_NET_HDR_F_NEEDS_CSUM in the packet transmission path.
2217          * This differs from the processing incoming packets path where the
2218          * driver could rely on VIRTIO_NET_HDR_F_DATA_VALID flag set by the
2219          * device.
2220          *
2221          * 5.1.6.2.1 Driver Requirements: Packet Transmission
2222          * The driver MUST NOT set the VIRTIO_NET_HDR_F_DATA_VALID and
2223          * VIRTIO_NET_HDR_F_RSC_INFO bits in flags.
2224          *
2225          * 5.1.6.2.2 Device Requirements: Packet Transmission
2226          * The device MUST ignore flag bits that it does not recognize.
2227          */
2228         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2229                 uint32_t hdrlen;
2230
2231                 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
2232                 if (hdr->csum_start <= hdrlen && l4_supported != 0) {
2233                         m->ol_flags |= RTE_MBUF_F_RX_L4_CKSUM_NONE;
2234                 } else {
2235                         /* Unknown proto or tunnel, do sw cksum. We can assume
2236                          * the cksum field is in the first segment since the
2237                          * buffers we provided to the host are large enough.
2238                          * In case of SCTP, this will be wrong since it's a CRC
2239                          * but there's nothing we can do.
2240                          */
2241                         uint16_t csum = 0, off;
2242
2243                         if (rte_raw_cksum_mbuf(m, hdr->csum_start,
2244                                         rte_pktmbuf_pkt_len(m) - hdr->csum_start, &csum) < 0)
2245                                 return;
2246                         if (likely(csum != 0xffff))
2247                                 csum = ~csum;
2248                         off = hdr->csum_offset + hdr->csum_start;
2249                         if (rte_pktmbuf_data_len(m) >= off + 1)
2250                                 *rte_pktmbuf_mtod_offset(m, uint16_t *, off) = csum;
2251                 }
2252         }
2253
2254         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2255                 if (hdr->gso_size == 0)
2256                         return;
2257
2258                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2259                 case VIRTIO_NET_HDR_GSO_TCPV4:
2260                 case VIRTIO_NET_HDR_GSO_TCPV6:
2261                         if ((ptype & RTE_PTYPE_L4_MASK) != RTE_PTYPE_L4_TCP)
2262                                 break;
2263                         m->ol_flags |= RTE_MBUF_F_RX_LRO | RTE_MBUF_F_RX_L4_CKSUM_NONE;
2264                         m->tso_segsz = hdr->gso_size;
2265                         break;
2266                 case VIRTIO_NET_HDR_GSO_UDP:
2267                         if ((ptype & RTE_PTYPE_L4_MASK) != RTE_PTYPE_L4_UDP)
2268                                 break;
2269                         m->ol_flags |= RTE_MBUF_F_RX_LRO | RTE_MBUF_F_RX_L4_CKSUM_NONE;
2270                         m->tso_segsz = hdr->gso_size;
2271                         break;
2272                 default:
2273                         break;
2274                 }
2275         }
2276 }
2277
2278 static __rte_noinline void
2279 copy_vnet_hdr_from_desc(struct virtio_net_hdr *hdr,
2280                 struct buf_vector *buf_vec)
2281 {
2282         uint64_t len;
2283         uint64_t remain = sizeof(struct virtio_net_hdr);
2284         uint64_t src;
2285         uint64_t dst = (uint64_t)(uintptr_t)hdr;
2286
2287         while (remain) {
2288                 len = RTE_MIN(remain, buf_vec->buf_len);
2289                 src = buf_vec->buf_addr;
2290                 rte_memcpy((void *)(uintptr_t)dst,
2291                                 (void *)(uintptr_t)src, len);
2292
2293                 remain -= len;
2294                 dst += len;
2295                 buf_vec++;
2296         }
2297 }
2298
2299 static __rte_always_inline int
2300 copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
2301                   struct buf_vector *buf_vec, uint16_t nr_vec,
2302                   struct rte_mbuf *m, struct rte_mempool *mbuf_pool,
2303                   bool legacy_ol_flags)
2304 {
2305         uint32_t buf_avail, buf_offset;
2306         uint64_t buf_addr, buf_len;
2307         uint32_t mbuf_avail, mbuf_offset;
2308         uint32_t cpy_len;
2309         struct rte_mbuf *cur = m, *prev = m;
2310         struct virtio_net_hdr tmp_hdr;
2311         struct virtio_net_hdr *hdr = NULL;
2312         /* A counter to avoid desc dead loop chain */
2313         uint16_t vec_idx = 0;
2314         struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
2315         int error = 0;
2316
2317         buf_addr = buf_vec[vec_idx].buf_addr;
2318         buf_len = buf_vec[vec_idx].buf_len;
2319
2320         if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
2321                 error = -1;
2322                 goto out;
2323         }
2324
2325         if (virtio_net_with_host_offload(dev)) {
2326                 if (unlikely(buf_len < sizeof(struct virtio_net_hdr))) {
2327                         /*
2328                          * No luck, the virtio-net header doesn't fit
2329                          * in a contiguous virtual area.
2330                          */
2331                         copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec);
2332                         hdr = &tmp_hdr;
2333                 } else {
2334                         hdr = (struct virtio_net_hdr *)((uintptr_t)buf_addr);
2335                 }
2336         }
2337
2338         /*
2339          * A virtio driver normally uses at least 2 desc buffers
2340          * for Tx: the first for storing the header, and others
2341          * for storing the data.
2342          */
2343         if (unlikely(buf_len < dev->vhost_hlen)) {
2344                 buf_offset = dev->vhost_hlen - buf_len;
2345                 vec_idx++;
2346                 buf_addr = buf_vec[vec_idx].buf_addr;
2347                 buf_len = buf_vec[vec_idx].buf_len;
2348                 buf_avail  = buf_len - buf_offset;
2349         } else if (buf_len == dev->vhost_hlen) {
2350                 if (unlikely(++vec_idx >= nr_vec))
2351                         goto out;
2352                 buf_addr = buf_vec[vec_idx].buf_addr;
2353                 buf_len = buf_vec[vec_idx].buf_len;
2354
2355                 buf_offset = 0;
2356                 buf_avail = buf_len;
2357         } else {
2358                 buf_offset = dev->vhost_hlen;
2359                 buf_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
2360         }
2361
2362         PRINT_PACKET(dev,
2363                         (uintptr_t)(buf_addr + buf_offset),
2364                         (uint32_t)buf_avail, 0);
2365
2366         mbuf_offset = 0;
2367         mbuf_avail  = m->buf_len - RTE_PKTMBUF_HEADROOM;
2368         while (1) {
2369                 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
2370
2371                 if (likely(cpy_len > MAX_BATCH_LEN ||
2372                                         vq->batch_copy_nb_elems >= vq->size ||
2373                                         (hdr && cur == m))) {
2374                         rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
2375                                                 mbuf_offset),
2376                                         (void *)((uintptr_t)(buf_addr +
2377                                                         buf_offset)), cpy_len);
2378                 } else {
2379                         batch_copy[vq->batch_copy_nb_elems].dst =
2380                                 rte_pktmbuf_mtod_offset(cur, void *,
2381                                                 mbuf_offset);
2382                         batch_copy[vq->batch_copy_nb_elems].src =
2383                                 (void *)((uintptr_t)(buf_addr + buf_offset));
2384                         batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
2385                         vq->batch_copy_nb_elems++;
2386                 }
2387
2388                 mbuf_avail  -= cpy_len;
2389                 mbuf_offset += cpy_len;
2390                 buf_avail -= cpy_len;
2391                 buf_offset += cpy_len;
2392
2393                 /* This buf reaches to its end, get the next one */
2394                 if (buf_avail == 0) {
2395                         if (++vec_idx >= nr_vec)
2396                                 break;
2397
2398                         buf_addr = buf_vec[vec_idx].buf_addr;
2399                         buf_len = buf_vec[vec_idx].buf_len;
2400
2401                         buf_offset = 0;
2402                         buf_avail  = buf_len;
2403
2404                         PRINT_PACKET(dev, (uintptr_t)buf_addr,
2405                                         (uint32_t)buf_avail, 0);
2406                 }
2407
2408                 /*
2409                  * This mbuf reaches to its end, get a new one
2410                  * to hold more data.
2411                  */
2412                 if (mbuf_avail == 0) {
2413                         cur = rte_pktmbuf_alloc(mbuf_pool);
2414                         if (unlikely(cur == NULL)) {
2415                                 VHOST_LOG_DATA(ERR, "Failed to "
2416                                         "allocate memory for mbuf.\n");
2417                                 error = -1;
2418                                 goto out;
2419                         }
2420
2421                         prev->next = cur;
2422                         prev->data_len = mbuf_offset;
2423                         m->nb_segs += 1;
2424                         m->pkt_len += mbuf_offset;
2425                         prev = cur;
2426
2427                         mbuf_offset = 0;
2428                         mbuf_avail  = cur->buf_len - RTE_PKTMBUF_HEADROOM;
2429                 }
2430         }
2431
2432         prev->data_len = mbuf_offset;
2433         m->pkt_len    += mbuf_offset;
2434
2435         if (hdr)
2436                 vhost_dequeue_offload(hdr, m, legacy_ol_flags);
2437
2438 out:
2439
2440         return error;
2441 }
2442
2443 static void
2444 virtio_dev_extbuf_free(void *addr __rte_unused, void *opaque)
2445 {
2446         rte_free(opaque);
2447 }
2448
2449 static int
2450 virtio_dev_extbuf_alloc(struct rte_mbuf *pkt, uint32_t size)
2451 {
2452         struct rte_mbuf_ext_shared_info *shinfo = NULL;
2453         uint32_t total_len = RTE_PKTMBUF_HEADROOM + size;
2454         uint16_t buf_len;
2455         rte_iova_t iova;
2456         void *buf;
2457
2458         total_len += sizeof(*shinfo) + sizeof(uintptr_t);
2459         total_len = RTE_ALIGN_CEIL(total_len, sizeof(uintptr_t));
2460
2461         if (unlikely(total_len > UINT16_MAX))
2462                 return -ENOSPC;
2463
2464         buf_len = total_len;
2465         buf = rte_malloc(NULL, buf_len, RTE_CACHE_LINE_SIZE);
2466         if (unlikely(buf == NULL))
2467                 return -ENOMEM;
2468
2469         /* Initialize shinfo */
2470         shinfo = rte_pktmbuf_ext_shinfo_init_helper(buf, &buf_len,
2471                                                 virtio_dev_extbuf_free, buf);
2472         if (unlikely(shinfo == NULL)) {
2473                 rte_free(buf);
2474                 VHOST_LOG_DATA(ERR, "Failed to init shinfo\n");
2475                 return -1;
2476         }
2477
2478         iova = rte_malloc_virt2iova(buf);
2479         rte_pktmbuf_attach_extbuf(pkt, buf, iova, buf_len, shinfo);
2480         rte_pktmbuf_reset_headroom(pkt);
2481
2482         return 0;
2483 }
2484
2485 /*
2486  * Prepare a host supported pktmbuf.
2487  */
2488 static __rte_always_inline int
2489 virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
2490                          uint32_t data_len)
2491 {
2492         if (rte_pktmbuf_tailroom(pkt) >= data_len)
2493                 return 0;
2494
2495         /* attach an external buffer if supported */
2496         if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
2497                 return 0;
2498
2499         /* check if chained buffers are allowed */
2500         if (!dev->linearbuf)
2501                 return 0;
2502
2503         return -1;
2504 }
2505
2506 __rte_always_inline
2507 static uint16_t
2508 virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
2509         struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count,
2510         bool legacy_ol_flags)
2511 {
2512         uint16_t i;
2513         uint16_t free_entries;
2514         uint16_t dropped = 0;
2515         static bool allocerr_warned;
2516
2517         /*
2518          * The ordering between avail index and
2519          * desc reads needs to be enforced.
2520          */
2521         free_entries = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE) -
2522                         vq->last_avail_idx;
2523         if (free_entries == 0)
2524                 return 0;
2525
2526         rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
2527
2528         VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
2529
2530         count = RTE_MIN(count, MAX_PKT_BURST);
2531         count = RTE_MIN(count, free_entries);
2532         VHOST_LOG_DATA(DEBUG, "(%d) about to dequeue %u buffers\n",
2533                         dev->vid, count);
2534
2535         if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
2536                 return 0;
2537
2538         for (i = 0; i < count; i++) {
2539                 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2540                 uint16_t head_idx;
2541                 uint32_t buf_len;
2542                 uint16_t nr_vec = 0;
2543                 int err;
2544
2545                 if (unlikely(fill_vec_buf_split(dev, vq,
2546                                                 vq->last_avail_idx + i,
2547                                                 &nr_vec, buf_vec,
2548                                                 &head_idx, &buf_len,
2549                                                 VHOST_ACCESS_RO) < 0))
2550                         break;
2551
2552                 update_shadow_used_ring_split(vq, head_idx, 0);
2553
2554                 err = virtio_dev_pktmbuf_prep(dev, pkts[i], buf_len);
2555                 if (unlikely(err)) {
2556                         /*
2557                          * mbuf allocation fails for jumbo packets when external
2558                          * buffer allocation is not allowed and linear buffer
2559                          * is required. Drop this packet.
2560                          */
2561                         if (!allocerr_warned) {
2562                                 VHOST_LOG_DATA(ERR,
2563                                         "Failed mbuf alloc of size %d from %s on %s.\n",
2564                                         buf_len, mbuf_pool->name, dev->ifname);
2565                                 allocerr_warned = true;
2566                         }
2567                         dropped += 1;
2568                         i++;
2569                         break;
2570                 }
2571
2572                 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts[i],
2573                                 mbuf_pool, legacy_ol_flags);
2574                 if (unlikely(err)) {
2575                         if (!allocerr_warned) {
2576                                 VHOST_LOG_DATA(ERR,
2577                                         "Failed to copy desc to mbuf on %s.\n",
2578                                         dev->ifname);
2579                                 allocerr_warned = true;
2580                         }
2581                         dropped += 1;
2582                         i++;
2583                         break;
2584                 }
2585         }
2586
2587         if (dropped)
2588                 rte_pktmbuf_free_bulk(&pkts[i - 1], count - i + 1);
2589
2590         vq->last_avail_idx += i;
2591
2592         do_data_copy_dequeue(vq);
2593         if (unlikely(i < count))
2594                 vq->shadow_used_idx = i;
2595         if (likely(vq->shadow_used_idx)) {
2596                 flush_shadow_used_ring_split(dev, vq);
2597                 vhost_vring_call_split(dev, vq);
2598         }
2599
2600         return (i - dropped);
2601 }
2602
2603 __rte_noinline
2604 static uint16_t
2605 virtio_dev_tx_split_legacy(struct virtio_net *dev,
2606         struct vhost_virtqueue *vq, struct rte_mempool *mbuf_pool,
2607         struct rte_mbuf **pkts, uint16_t count)
2608 {
2609         return virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count, true);
2610 }
2611
2612 __rte_noinline
2613 static uint16_t
2614 virtio_dev_tx_split_compliant(struct virtio_net *dev,
2615         struct vhost_virtqueue *vq, struct rte_mempool *mbuf_pool,
2616         struct rte_mbuf **pkts, uint16_t count)
2617 {
2618         return virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count, false);
2619 }
2620
2621 static __rte_always_inline int
2622 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
2623                                  struct vhost_virtqueue *vq,
2624                                  struct rte_mbuf **pkts,
2625                                  uint16_t avail_idx,
2626                                  uintptr_t *desc_addrs,
2627                                  uint16_t *ids)
2628 {
2629         bool wrap = vq->avail_wrap_counter;
2630         struct vring_packed_desc *descs = vq->desc_packed;
2631         uint64_t lens[PACKED_BATCH_SIZE];
2632         uint64_t buf_lens[PACKED_BATCH_SIZE];
2633         uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2634         uint16_t flags, i;
2635
2636         if (unlikely(avail_idx & PACKED_BATCH_MASK))
2637                 return -1;
2638         if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
2639                 return -1;
2640
2641         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2642                 flags = descs[avail_idx + i].flags;
2643                 if (unlikely((wrap != !!(flags & VRING_DESC_F_AVAIL)) ||
2644                              (wrap == !!(flags & VRING_DESC_F_USED))  ||
2645                              (flags & PACKED_DESC_SINGLE_DEQUEUE_FLAG)))
2646                         return -1;
2647         }
2648
2649         rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
2650
2651         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2652                 lens[i] = descs[avail_idx + i].len;
2653
2654         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2655                 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
2656                                                   descs[avail_idx + i].addr,
2657                                                   &lens[i], VHOST_ACCESS_RW);
2658         }
2659
2660         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2661                 if (unlikely(!desc_addrs[i]))
2662                         return -1;
2663                 if (unlikely((lens[i] != descs[avail_idx + i].len)))
2664                         return -1;
2665         }
2666
2667         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2668                 if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
2669                         goto err;
2670         }
2671
2672         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2673                 buf_lens[i] = pkts[i]->buf_len - pkts[i]->data_off;
2674
2675         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2676                 if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
2677                         goto err;
2678         }
2679
2680         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2681                 pkts[i]->pkt_len = lens[i] - buf_offset;
2682                 pkts[i]->data_len = pkts[i]->pkt_len;
2683                 ids[i] = descs[avail_idx + i].id;
2684         }
2685
2686         return 0;
2687
2688 err:
2689         return -1;
2690 }
2691
2692 static __rte_always_inline int
2693 virtio_dev_tx_batch_packed(struct virtio_net *dev,
2694                            struct vhost_virtqueue *vq,
2695                            struct rte_mbuf **pkts,
2696                            bool legacy_ol_flags)
2697 {
2698         uint16_t avail_idx = vq->last_avail_idx;
2699         uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2700         struct virtio_net_hdr *hdr;
2701         uintptr_t desc_addrs[PACKED_BATCH_SIZE];
2702         uint16_t ids[PACKED_BATCH_SIZE];
2703         uint16_t i;
2704
2705         if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
2706                                              desc_addrs, ids))
2707                 return -1;
2708
2709         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2710                 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
2711
2712         vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2713                 rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
2714                            (void *)(uintptr_t)(desc_addrs[i] + buf_offset),
2715                            pkts[i]->pkt_len);
2716
2717         if (virtio_net_with_host_offload(dev)) {
2718                 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2719                         hdr = (struct virtio_net_hdr *)(desc_addrs[i]);
2720                         vhost_dequeue_offload(hdr, pkts[i], legacy_ol_flags);
2721                 }
2722         }
2723
2724         if (virtio_net_is_inorder(dev))
2725                 vhost_shadow_dequeue_batch_packed_inorder(vq,
2726                         ids[PACKED_BATCH_SIZE - 1]);
2727         else
2728                 vhost_shadow_dequeue_batch_packed(dev, vq, ids);
2729
2730         vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
2731
2732         return 0;
2733 }
2734
2735 static __rte_always_inline int
2736 vhost_dequeue_single_packed(struct virtio_net *dev,
2737                             struct vhost_virtqueue *vq,
2738                             struct rte_mempool *mbuf_pool,
2739                             struct rte_mbuf *pkts,
2740                             uint16_t *buf_id,
2741                             uint16_t *desc_count,
2742                             bool legacy_ol_flags)
2743 {
2744         struct buf_vector buf_vec[BUF_VECTOR_MAX];
2745         uint32_t buf_len;
2746         uint16_t nr_vec = 0;
2747         int err;
2748         static bool allocerr_warned;
2749
2750         if (unlikely(fill_vec_buf_packed(dev, vq,
2751                                          vq->last_avail_idx, desc_count,
2752                                          buf_vec, &nr_vec,
2753                                          buf_id, &buf_len,
2754                                          VHOST_ACCESS_RO) < 0))
2755                 return -1;
2756
2757         if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
2758                 if (!allocerr_warned) {
2759                         VHOST_LOG_DATA(ERR,
2760                                 "Failed mbuf alloc of size %d from %s on %s.\n",
2761                                 buf_len, mbuf_pool->name, dev->ifname);
2762                         allocerr_warned = true;
2763                 }
2764                 return -1;
2765         }
2766
2767         err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts,
2768                                 mbuf_pool, legacy_ol_flags);
2769         if (unlikely(err)) {
2770                 if (!allocerr_warned) {
2771                         VHOST_LOG_DATA(ERR,
2772                                 "Failed to copy desc to mbuf on %s.\n",
2773                                 dev->ifname);
2774                         allocerr_warned = true;
2775                 }
2776                 return -1;
2777         }
2778
2779         return 0;
2780 }
2781
2782 static __rte_always_inline int
2783 virtio_dev_tx_single_packed(struct virtio_net *dev,
2784                             struct vhost_virtqueue *vq,
2785                             struct rte_mempool *mbuf_pool,
2786                             struct rte_mbuf *pkts,
2787                             bool legacy_ol_flags)
2788 {
2789
2790         uint16_t buf_id, desc_count = 0;
2791         int ret;
2792
2793         ret = vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id,
2794                                         &desc_count, legacy_ol_flags);
2795
2796         if (likely(desc_count > 0)) {
2797                 if (virtio_net_is_inorder(dev))
2798                         vhost_shadow_dequeue_single_packed_inorder(vq, buf_id,
2799                                                                    desc_count);
2800                 else
2801                         vhost_shadow_dequeue_single_packed(vq, buf_id,
2802                                         desc_count);
2803
2804                 vq_inc_last_avail_packed(vq, desc_count);
2805         }
2806
2807         return ret;
2808 }
2809
2810 __rte_always_inline
2811 static uint16_t
2812 virtio_dev_tx_packed(struct virtio_net *dev,
2813                      struct vhost_virtqueue *__rte_restrict vq,
2814                      struct rte_mempool *mbuf_pool,
2815                      struct rte_mbuf **__rte_restrict pkts,
2816                      uint32_t count,
2817                      bool legacy_ol_flags)
2818 {
2819         uint32_t pkt_idx = 0;
2820
2821         if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
2822                 return 0;
2823
2824         do {
2825                 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
2826
2827                 if (count - pkt_idx >= PACKED_BATCH_SIZE) {
2828                         if (!virtio_dev_tx_batch_packed(dev, vq,
2829                                                         &pkts[pkt_idx],
2830                                                         legacy_ol_flags)) {
2831                                 pkt_idx += PACKED_BATCH_SIZE;
2832                                 continue;
2833                         }
2834                 }
2835
2836                 if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
2837                                                 pkts[pkt_idx],
2838                                                 legacy_ol_flags))
2839                         break;
2840                 pkt_idx++;
2841         } while (pkt_idx < count);
2842
2843         if (pkt_idx != count)
2844                 rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
2845
2846         if (vq->shadow_used_idx) {
2847                 do_data_copy_dequeue(vq);
2848
2849                 vhost_flush_dequeue_shadow_packed(dev, vq);
2850                 vhost_vring_call_packed(dev, vq);
2851         }
2852
2853         return pkt_idx;
2854 }
2855
2856 __rte_noinline
2857 static uint16_t
2858 virtio_dev_tx_packed_legacy(struct virtio_net *dev,
2859         struct vhost_virtqueue *__rte_restrict vq, struct rte_mempool *mbuf_pool,
2860         struct rte_mbuf **__rte_restrict pkts, uint32_t count)
2861 {
2862         return virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, count, true);
2863 }
2864
2865 __rte_noinline
2866 static uint16_t
2867 virtio_dev_tx_packed_compliant(struct virtio_net *dev,
2868         struct vhost_virtqueue *__rte_restrict vq, struct rte_mempool *mbuf_pool,
2869         struct rte_mbuf **__rte_restrict pkts, uint32_t count)
2870 {
2871         return virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, count, false);
2872 }
2873
2874 uint16_t
2875 rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
2876         struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
2877 {
2878         struct virtio_net *dev;
2879         struct rte_mbuf *rarp_mbuf = NULL;
2880         struct vhost_virtqueue *vq;
2881         int16_t success = 1;
2882
2883         dev = get_device(vid);
2884         if (!dev)
2885                 return 0;
2886
2887         if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
2888                 VHOST_LOG_DATA(ERR,
2889                         "(%d) %s: built-in vhost net backend is disabled.\n",
2890                         dev->vid, __func__);
2891                 return 0;
2892         }
2893
2894         if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
2895                 VHOST_LOG_DATA(ERR,
2896                         "(%d) %s: invalid virtqueue idx %d.\n",
2897                         dev->vid, __func__, queue_id);
2898                 return 0;
2899         }
2900
2901         vq = dev->virtqueue[queue_id];
2902
2903         if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0))
2904                 return 0;
2905
2906         if (unlikely(!vq->enabled)) {
2907                 count = 0;
2908                 goto out_access_unlock;
2909         }
2910
2911         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2912                 vhost_user_iotlb_rd_lock(vq);
2913
2914         if (unlikely(!vq->access_ok))
2915                 if (unlikely(vring_translate(dev, vq) < 0)) {
2916                         count = 0;
2917                         goto out;
2918                 }
2919
2920         /*
2921          * Construct a RARP broadcast packet, and inject it to the "pkts"
2922          * array, to looks like that guest actually send such packet.
2923          *
2924          * Check user_send_rarp() for more information.
2925          *
2926          * broadcast_rarp shares a cacheline in the virtio_net structure
2927          * with some fields that are accessed during enqueue and
2928          * __atomic_compare_exchange_n causes a write if performed compare
2929          * and exchange. This could result in false sharing between enqueue
2930          * and dequeue.
2931          *
2932          * Prevent unnecessary false sharing by reading broadcast_rarp first
2933          * and only performing compare and exchange if the read indicates it
2934          * is likely to be set.
2935          */
2936         if (unlikely(__atomic_load_n(&dev->broadcast_rarp, __ATOMIC_ACQUIRE) &&
2937                         __atomic_compare_exchange_n(&dev->broadcast_rarp,
2938                         &success, 0, 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED))) {
2939
2940                 rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac);
2941                 if (rarp_mbuf == NULL) {
2942                         VHOST_LOG_DATA(ERR, "Failed to make RARP packet.\n");
2943                         count = 0;
2944                         goto out;
2945                 }
2946                 /*
2947                  * Inject it to the head of "pkts" array, so that switch's mac
2948                  * learning table will get updated first.
2949                  */
2950                 pkts[0] = rarp_mbuf;
2951                 pkts++;
2952                 count -= 1;
2953         }
2954
2955         if (vq_is_packed(dev)) {
2956                 if (dev->flags & VIRTIO_DEV_LEGACY_OL_FLAGS)
2957                         count = virtio_dev_tx_packed_legacy(dev, vq, mbuf_pool, pkts, count);
2958                 else
2959                         count = virtio_dev_tx_packed_compliant(dev, vq, mbuf_pool, pkts, count);
2960         } else {
2961                 if (dev->flags & VIRTIO_DEV_LEGACY_OL_FLAGS)
2962                         count = virtio_dev_tx_split_legacy(dev, vq, mbuf_pool, pkts, count);
2963                 else
2964                         count = virtio_dev_tx_split_compliant(dev, vq, mbuf_pool, pkts, count);
2965         }
2966
2967 out:
2968         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2969                 vhost_user_iotlb_rd_unlock(vq);
2970
2971 out_access_unlock:
2972         rte_spinlock_unlock(&vq->access_lock);
2973
2974         if (unlikely(rarp_mbuf != NULL))
2975                 count += 1;
2976
2977         return count;
2978 }