1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2016 Intel Corporation
7 #include <linux/virtio_net.h>
10 #include <rte_memcpy.h>
11 #include <rte_ether.h>
13 #include <rte_vhost.h>
18 #include <rte_spinlock.h>
19 #include <rte_malloc.h>
20 #include <rte_vhost_async.h>
25 #define MAX_BATCH_LEN 256
27 #define VHOST_ASYNC_BATCH_THRESHOLD 32
29 static __rte_always_inline bool
30 rxvq_is_mergeable(struct virtio_net *dev)
32 return dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF);
35 static __rte_always_inline bool
36 virtio_net_is_inorder(struct virtio_net *dev)
38 return dev->features & (1ULL << VIRTIO_F_IN_ORDER);
42 is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
44 return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
48 do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq)
50 struct batch_copy_elem *elem = vq->batch_copy_elems;
51 uint16_t count = vq->batch_copy_nb_elems;
54 for (i = 0; i < count; i++) {
55 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
56 vhost_log_cache_write_iova(dev, vq, elem[i].log_addr,
58 PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0);
61 vq->batch_copy_nb_elems = 0;
65 do_data_copy_dequeue(struct vhost_virtqueue *vq)
67 struct batch_copy_elem *elem = vq->batch_copy_elems;
68 uint16_t count = vq->batch_copy_nb_elems;
71 for (i = 0; i < count; i++)
72 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
74 vq->batch_copy_nb_elems = 0;
77 static __rte_always_inline void
78 do_flush_shadow_used_ring_split(struct virtio_net *dev,
79 struct vhost_virtqueue *vq,
80 uint16_t to, uint16_t from, uint16_t size)
82 rte_memcpy(&vq->used->ring[to],
83 &vq->shadow_used_split[from],
84 size * sizeof(struct vring_used_elem));
85 vhost_log_cache_used_vring(dev, vq,
86 offsetof(struct vring_used, ring[to]),
87 size * sizeof(struct vring_used_elem));
90 static __rte_always_inline void
91 flush_shadow_used_ring_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
93 uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
95 if (used_idx + vq->shadow_used_idx <= vq->size) {
96 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0,
101 /* update used ring interval [used_idx, vq->size] */
102 size = vq->size - used_idx;
103 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, size);
105 /* update the left half used ring interval [0, left_size] */
106 do_flush_shadow_used_ring_split(dev, vq, 0, size,
107 vq->shadow_used_idx - size);
109 vq->last_used_idx += vq->shadow_used_idx;
111 vhost_log_cache_sync(dev, vq);
113 __atomic_add_fetch(&vq->used->idx, vq->shadow_used_idx,
115 vq->shadow_used_idx = 0;
116 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
117 sizeof(vq->used->idx));
120 static __rte_always_inline void
121 async_flush_shadow_used_ring_split(struct virtio_net *dev,
122 struct vhost_virtqueue *vq)
124 uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
126 if (used_idx + vq->shadow_used_idx <= vq->size) {
127 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0,
128 vq->shadow_used_idx);
132 /* update used ring interval [used_idx, vq->size] */
133 size = vq->size - used_idx;
134 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, size);
136 /* update the left half used ring interval [0, left_size] */
137 do_flush_shadow_used_ring_split(dev, vq, 0, size,
138 vq->shadow_used_idx - size);
141 vq->last_used_idx += vq->shadow_used_idx;
142 vq->shadow_used_idx = 0;
145 static __rte_always_inline void
146 update_shadow_used_ring_split(struct vhost_virtqueue *vq,
147 uint16_t desc_idx, uint32_t len)
149 uint16_t i = vq->shadow_used_idx++;
151 vq->shadow_used_split[i].id = desc_idx;
152 vq->shadow_used_split[i].len = len;
155 static __rte_always_inline void
156 vhost_flush_enqueue_shadow_packed(struct virtio_net *dev,
157 struct vhost_virtqueue *vq)
160 uint16_t used_idx = vq->last_used_idx;
161 uint16_t head_idx = vq->last_used_idx;
162 uint16_t head_flags = 0;
164 /* Split loop in two to save memory barriers */
165 for (i = 0; i < vq->shadow_used_idx; i++) {
166 vq->desc_packed[used_idx].id = vq->shadow_used_packed[i].id;
167 vq->desc_packed[used_idx].len = vq->shadow_used_packed[i].len;
169 used_idx += vq->shadow_used_packed[i].count;
170 if (used_idx >= vq->size)
171 used_idx -= vq->size;
176 for (i = 0; i < vq->shadow_used_idx; i++) {
179 if (vq->shadow_used_packed[i].len)
180 flags = VRING_DESC_F_WRITE;
184 if (vq->used_wrap_counter) {
185 flags |= VRING_DESC_F_USED;
186 flags |= VRING_DESC_F_AVAIL;
188 flags &= ~VRING_DESC_F_USED;
189 flags &= ~VRING_DESC_F_AVAIL;
193 vq->desc_packed[vq->last_used_idx].flags = flags;
195 vhost_log_cache_used_vring(dev, vq,
197 sizeof(struct vring_packed_desc),
198 sizeof(struct vring_packed_desc));
200 head_idx = vq->last_used_idx;
204 vq_inc_last_used_packed(vq, vq->shadow_used_packed[i].count);
207 vq->desc_packed[head_idx].flags = head_flags;
209 vhost_log_cache_used_vring(dev, vq,
211 sizeof(struct vring_packed_desc),
212 sizeof(struct vring_packed_desc));
214 vq->shadow_used_idx = 0;
215 vhost_log_cache_sync(dev, vq);
218 static __rte_always_inline void
219 vhost_flush_dequeue_shadow_packed(struct virtio_net *dev,
220 struct vhost_virtqueue *vq)
222 struct vring_used_elem_packed *used_elem = &vq->shadow_used_packed[0];
224 vq->desc_packed[vq->shadow_last_used_idx].id = used_elem->id;
225 /* desc flags is the synchronization point for virtio packed vring */
226 __atomic_store_n(&vq->desc_packed[vq->shadow_last_used_idx].flags,
227 used_elem->flags, __ATOMIC_RELEASE);
229 vhost_log_cache_used_vring(dev, vq, vq->shadow_last_used_idx *
230 sizeof(struct vring_packed_desc),
231 sizeof(struct vring_packed_desc));
232 vq->shadow_used_idx = 0;
233 vhost_log_cache_sync(dev, vq);
236 static __rte_always_inline void
237 vhost_flush_enqueue_batch_packed(struct virtio_net *dev,
238 struct vhost_virtqueue *vq,
245 if (vq->shadow_used_idx) {
246 do_data_copy_enqueue(dev, vq);
247 vhost_flush_enqueue_shadow_packed(dev, vq);
250 flags = PACKED_DESC_ENQUEUE_USED_FLAG(vq->used_wrap_counter);
252 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
253 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
254 vq->desc_packed[vq->last_used_idx + i].len = lens[i];
259 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
260 vq->desc_packed[vq->last_used_idx + i].flags = flags;
262 vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
263 sizeof(struct vring_packed_desc),
264 sizeof(struct vring_packed_desc) *
266 vhost_log_cache_sync(dev, vq);
268 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
271 static __rte_always_inline void
272 vhost_shadow_dequeue_batch_packed_inorder(struct vhost_virtqueue *vq,
275 vq->shadow_used_packed[0].id = id;
277 if (!vq->shadow_used_idx) {
278 vq->shadow_last_used_idx = vq->last_used_idx;
279 vq->shadow_used_packed[0].flags =
280 PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
281 vq->shadow_used_packed[0].len = 0;
282 vq->shadow_used_packed[0].count = 1;
283 vq->shadow_used_idx++;
286 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
289 static __rte_always_inline void
290 vhost_shadow_dequeue_batch_packed(struct virtio_net *dev,
291 struct vhost_virtqueue *vq,
298 flags = PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
300 if (!vq->shadow_used_idx) {
301 vq->shadow_last_used_idx = vq->last_used_idx;
302 vq->shadow_used_packed[0].id = ids[0];
303 vq->shadow_used_packed[0].len = 0;
304 vq->shadow_used_packed[0].count = 1;
305 vq->shadow_used_packed[0].flags = flags;
306 vq->shadow_used_idx++;
311 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE) {
312 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
313 vq->desc_packed[vq->last_used_idx + i].len = 0;
317 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE)
318 vq->desc_packed[vq->last_used_idx + i].flags = flags;
320 vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
321 sizeof(struct vring_packed_desc),
322 sizeof(struct vring_packed_desc) *
324 vhost_log_cache_sync(dev, vq);
326 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
329 static __rte_always_inline void
330 vhost_shadow_dequeue_single_packed(struct vhost_virtqueue *vq,
336 flags = vq->desc_packed[vq->last_used_idx].flags;
337 if (vq->used_wrap_counter) {
338 flags |= VRING_DESC_F_USED;
339 flags |= VRING_DESC_F_AVAIL;
341 flags &= ~VRING_DESC_F_USED;
342 flags &= ~VRING_DESC_F_AVAIL;
345 if (!vq->shadow_used_idx) {
346 vq->shadow_last_used_idx = vq->last_used_idx;
348 vq->shadow_used_packed[0].id = buf_id;
349 vq->shadow_used_packed[0].len = 0;
350 vq->shadow_used_packed[0].flags = flags;
351 vq->shadow_used_idx++;
353 vq->desc_packed[vq->last_used_idx].id = buf_id;
354 vq->desc_packed[vq->last_used_idx].len = 0;
355 vq->desc_packed[vq->last_used_idx].flags = flags;
358 vq_inc_last_used_packed(vq, count);
361 static __rte_always_inline void
362 vhost_shadow_dequeue_single_packed_inorder(struct vhost_virtqueue *vq,
368 vq->shadow_used_packed[0].id = buf_id;
370 flags = vq->desc_packed[vq->last_used_idx].flags;
371 if (vq->used_wrap_counter) {
372 flags |= VRING_DESC_F_USED;
373 flags |= VRING_DESC_F_AVAIL;
375 flags &= ~VRING_DESC_F_USED;
376 flags &= ~VRING_DESC_F_AVAIL;
379 if (!vq->shadow_used_idx) {
380 vq->shadow_last_used_idx = vq->last_used_idx;
381 vq->shadow_used_packed[0].len = 0;
382 vq->shadow_used_packed[0].flags = flags;
383 vq->shadow_used_idx++;
386 vq_inc_last_used_packed(vq, count);
389 static __rte_always_inline void
390 vhost_shadow_enqueue_single_packed(struct virtio_net *dev,
391 struct vhost_virtqueue *vq,
395 uint16_t num_buffers)
398 for (i = 0; i < num_buffers; i++) {
399 /* enqueue shadow flush action aligned with batch num */
400 if (!vq->shadow_used_idx)
401 vq->shadow_aligned_idx = vq->last_used_idx &
403 vq->shadow_used_packed[vq->shadow_used_idx].id = id[i];
404 vq->shadow_used_packed[vq->shadow_used_idx].len = len[i];
405 vq->shadow_used_packed[vq->shadow_used_idx].count = count[i];
406 vq->shadow_aligned_idx += count[i];
407 vq->shadow_used_idx++;
410 if (vq->shadow_aligned_idx >= PACKED_BATCH_SIZE) {
411 do_data_copy_enqueue(dev, vq);
412 vhost_flush_enqueue_shadow_packed(dev, vq);
416 /* avoid write operation when necessary, to lessen cache issues */
417 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
418 if ((var) != (val)) \
422 static __rte_always_inline void
423 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
425 uint64_t csum_l4 = m_buf->ol_flags & PKT_TX_L4_MASK;
427 if (m_buf->ol_flags & PKT_TX_TCP_SEG)
428 csum_l4 |= PKT_TX_TCP_CKSUM;
431 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
432 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
435 case PKT_TX_TCP_CKSUM:
436 net_hdr->csum_offset = (offsetof(struct rte_tcp_hdr,
439 case PKT_TX_UDP_CKSUM:
440 net_hdr->csum_offset = (offsetof(struct rte_udp_hdr,
443 case PKT_TX_SCTP_CKSUM:
444 net_hdr->csum_offset = (offsetof(struct rte_sctp_hdr,
449 ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
450 ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
451 ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
454 /* IP cksum verification cannot be bypassed, then calculate here */
455 if (m_buf->ol_flags & PKT_TX_IP_CKSUM) {
456 struct rte_ipv4_hdr *ipv4_hdr;
458 ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct rte_ipv4_hdr *,
460 ipv4_hdr->hdr_checksum = 0;
461 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
464 if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
465 if (m_buf->ol_flags & PKT_TX_IPV4)
466 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
468 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
469 net_hdr->gso_size = m_buf->tso_segsz;
470 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
472 } else if (m_buf->ol_flags & PKT_TX_UDP_SEG) {
473 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
474 net_hdr->gso_size = m_buf->tso_segsz;
475 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len +
478 ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
479 ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
480 ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
484 static __rte_always_inline int
485 map_one_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
486 struct buf_vector *buf_vec, uint16_t *vec_idx,
487 uint64_t desc_iova, uint64_t desc_len, uint8_t perm)
489 uint16_t vec_id = *vec_idx;
493 uint64_t desc_chunck_len = desc_len;
495 if (unlikely(vec_id >= BUF_VECTOR_MAX))
498 desc_addr = vhost_iova_to_vva(dev, vq,
502 if (unlikely(!desc_addr))
505 rte_prefetch0((void *)(uintptr_t)desc_addr);
507 buf_vec[vec_id].buf_iova = desc_iova;
508 buf_vec[vec_id].buf_addr = desc_addr;
509 buf_vec[vec_id].buf_len = desc_chunck_len;
511 desc_len -= desc_chunck_len;
512 desc_iova += desc_chunck_len;
520 static __rte_always_inline int
521 fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
522 uint32_t avail_idx, uint16_t *vec_idx,
523 struct buf_vector *buf_vec, uint16_t *desc_chain_head,
524 uint32_t *desc_chain_len, uint8_t perm)
526 uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
527 uint16_t vec_id = *vec_idx;
530 uint32_t nr_descs = vq->size;
532 struct vring_desc *descs = vq->desc;
533 struct vring_desc *idesc = NULL;
535 if (unlikely(idx >= vq->size))
538 *desc_chain_head = idx;
540 if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
541 dlen = vq->desc[idx].len;
542 nr_descs = dlen / sizeof(struct vring_desc);
543 if (unlikely(nr_descs > vq->size))
546 descs = (struct vring_desc *)(uintptr_t)
547 vhost_iova_to_vva(dev, vq, vq->desc[idx].addr,
550 if (unlikely(!descs))
553 if (unlikely(dlen < vq->desc[idx].len)) {
555 * The indirect desc table is not contiguous
556 * in process VA space, we have to copy it.
558 idesc = vhost_alloc_copy_ind_table(dev, vq,
559 vq->desc[idx].addr, vq->desc[idx].len);
560 if (unlikely(!idesc))
570 if (unlikely(idx >= nr_descs || cnt++ >= nr_descs)) {
571 free_ind_table(idesc);
575 len += descs[idx].len;
577 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
578 descs[idx].addr, descs[idx].len,
580 free_ind_table(idesc);
584 if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
587 idx = descs[idx].next;
590 *desc_chain_len = len;
593 if (unlikely(!!idesc))
594 free_ind_table(idesc);
600 * Returns -1 on fail, 0 on success
603 reserve_avail_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
604 uint32_t size, struct buf_vector *buf_vec,
605 uint16_t *num_buffers, uint16_t avail_head,
609 uint16_t vec_idx = 0;
610 uint16_t max_tries, tries = 0;
612 uint16_t head_idx = 0;
616 cur_idx = vq->last_avail_idx;
618 if (rxvq_is_mergeable(dev))
619 max_tries = vq->size - 1;
624 if (unlikely(cur_idx == avail_head))
627 * if we tried all available ring items, and still
628 * can't get enough buf, it means something abnormal
631 if (unlikely(++tries > max_tries))
634 if (unlikely(fill_vec_buf_split(dev, vq, cur_idx,
637 VHOST_ACCESS_RW) < 0))
639 len = RTE_MIN(len, size);
640 update_shadow_used_ring_split(vq, head_idx, len);
652 static __rte_always_inline int
653 fill_vec_buf_packed_indirect(struct virtio_net *dev,
654 struct vhost_virtqueue *vq,
655 struct vring_packed_desc *desc, uint16_t *vec_idx,
656 struct buf_vector *buf_vec, uint32_t *len, uint8_t perm)
660 uint16_t vec_id = *vec_idx;
662 struct vring_packed_desc *descs, *idescs = NULL;
665 descs = (struct vring_packed_desc *)(uintptr_t)
666 vhost_iova_to_vva(dev, vq, desc->addr, &dlen, VHOST_ACCESS_RO);
667 if (unlikely(!descs))
670 if (unlikely(dlen < desc->len)) {
672 * The indirect desc table is not contiguous
673 * in process VA space, we have to copy it.
675 idescs = vhost_alloc_copy_ind_table(dev,
676 vq, desc->addr, desc->len);
677 if (unlikely(!idescs))
683 nr_descs = desc->len / sizeof(struct vring_packed_desc);
684 if (unlikely(nr_descs >= vq->size)) {
685 free_ind_table(idescs);
689 for (i = 0; i < nr_descs; i++) {
690 if (unlikely(vec_id >= BUF_VECTOR_MAX)) {
691 free_ind_table(idescs);
695 *len += descs[i].len;
696 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
697 descs[i].addr, descs[i].len,
703 if (unlikely(!!idescs))
704 free_ind_table(idescs);
709 static __rte_always_inline int
710 fill_vec_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
711 uint16_t avail_idx, uint16_t *desc_count,
712 struct buf_vector *buf_vec, uint16_t *vec_idx,
713 uint16_t *buf_id, uint32_t *len, uint8_t perm)
715 bool wrap_counter = vq->avail_wrap_counter;
716 struct vring_packed_desc *descs = vq->desc_packed;
717 uint16_t vec_id = *vec_idx;
719 if (avail_idx < vq->last_avail_idx)
723 * Perform a load-acquire barrier in desc_is_avail to
724 * enforce the ordering between desc flags and desc
727 if (unlikely(!desc_is_avail(&descs[avail_idx], wrap_counter)))
734 if (unlikely(vec_id >= BUF_VECTOR_MAX))
737 if (unlikely(*desc_count >= vq->size))
741 *buf_id = descs[avail_idx].id;
743 if (descs[avail_idx].flags & VRING_DESC_F_INDIRECT) {
744 if (unlikely(fill_vec_buf_packed_indirect(dev, vq,
750 *len += descs[avail_idx].len;
752 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
753 descs[avail_idx].addr,
754 descs[avail_idx].len,
759 if ((descs[avail_idx].flags & VRING_DESC_F_NEXT) == 0)
762 if (++avail_idx >= vq->size) {
763 avail_idx -= vq->size;
773 static __rte_noinline void
774 copy_vnet_hdr_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
775 struct buf_vector *buf_vec,
776 struct virtio_net_hdr_mrg_rxbuf *hdr)
779 uint64_t remain = dev->vhost_hlen;
780 uint64_t src = (uint64_t)(uintptr_t)hdr, dst;
781 uint64_t iova = buf_vec->buf_iova;
784 len = RTE_MIN(remain,
786 dst = buf_vec->buf_addr;
787 rte_memcpy((void *)(uintptr_t)dst,
788 (void *)(uintptr_t)src,
791 PRINT_PACKET(dev, (uintptr_t)dst,
793 vhost_log_cache_write_iova(dev, vq,
803 static __rte_always_inline int
804 copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
805 struct rte_mbuf *m, struct buf_vector *buf_vec,
806 uint16_t nr_vec, uint16_t num_buffers)
808 uint32_t vec_idx = 0;
809 uint32_t mbuf_offset, mbuf_avail;
810 uint32_t buf_offset, buf_avail;
811 uint64_t buf_addr, buf_iova, buf_len;
814 struct rte_mbuf *hdr_mbuf;
815 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
816 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
819 if (unlikely(m == NULL)) {
824 buf_addr = buf_vec[vec_idx].buf_addr;
825 buf_iova = buf_vec[vec_idx].buf_iova;
826 buf_len = buf_vec[vec_idx].buf_len;
828 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
835 if (unlikely(buf_len < dev->vhost_hlen))
838 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
840 VHOST_LOG_DATA(DEBUG, "(%d) RX: num merge buffers %d\n",
841 dev->vid, num_buffers);
843 if (unlikely(buf_len < dev->vhost_hlen)) {
844 buf_offset = dev->vhost_hlen - buf_len;
846 buf_addr = buf_vec[vec_idx].buf_addr;
847 buf_iova = buf_vec[vec_idx].buf_iova;
848 buf_len = buf_vec[vec_idx].buf_len;
849 buf_avail = buf_len - buf_offset;
851 buf_offset = dev->vhost_hlen;
852 buf_avail = buf_len - dev->vhost_hlen;
855 mbuf_avail = rte_pktmbuf_data_len(m);
857 while (mbuf_avail != 0 || m->next != NULL) {
858 /* done with current buf, get the next one */
859 if (buf_avail == 0) {
861 if (unlikely(vec_idx >= nr_vec)) {
866 buf_addr = buf_vec[vec_idx].buf_addr;
867 buf_iova = buf_vec[vec_idx].buf_iova;
868 buf_len = buf_vec[vec_idx].buf_len;
874 /* done with current mbuf, get the next one */
875 if (mbuf_avail == 0) {
879 mbuf_avail = rte_pktmbuf_data_len(m);
883 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
884 if (rxvq_is_mergeable(dev))
885 ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
888 if (unlikely(hdr == &tmp_hdr)) {
889 copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
891 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
893 vhost_log_cache_write_iova(dev, vq,
901 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
903 if (likely(cpy_len > MAX_BATCH_LEN ||
904 vq->batch_copy_nb_elems >= vq->size)) {
905 rte_memcpy((void *)((uintptr_t)(buf_addr + buf_offset)),
906 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
908 vhost_log_cache_write_iova(dev, vq,
909 buf_iova + buf_offset,
911 PRINT_PACKET(dev, (uintptr_t)(buf_addr + buf_offset),
914 batch_copy[vq->batch_copy_nb_elems].dst =
915 (void *)((uintptr_t)(buf_addr + buf_offset));
916 batch_copy[vq->batch_copy_nb_elems].src =
917 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
918 batch_copy[vq->batch_copy_nb_elems].log_addr =
919 buf_iova + buf_offset;
920 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
921 vq->batch_copy_nb_elems++;
924 mbuf_avail -= cpy_len;
925 mbuf_offset += cpy_len;
926 buf_avail -= cpy_len;
927 buf_offset += cpy_len;
935 static __rte_always_inline void
936 async_fill_vec(struct iovec *v, void *base, size_t len)
942 static __rte_always_inline void
943 async_fill_iter(struct rte_vhost_iov_iter *it, size_t count,
944 struct iovec *vec, unsigned long nr_seg)
951 it->nr_segs = nr_seg;
958 static __rte_always_inline void
959 async_fill_desc(struct rte_vhost_async_desc *desc,
960 struct rte_vhost_iov_iter *src, struct rte_vhost_iov_iter *dst)
966 static __rte_always_inline int
967 async_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
968 struct rte_mbuf *m, struct buf_vector *buf_vec,
969 uint16_t nr_vec, uint16_t num_buffers,
970 struct iovec *src_iovec, struct iovec *dst_iovec,
971 struct rte_vhost_iov_iter *src_it,
972 struct rte_vhost_iov_iter *dst_it)
974 uint32_t vec_idx = 0;
975 uint32_t mbuf_offset, mbuf_avail;
976 uint32_t buf_offset, buf_avail;
977 uint64_t buf_addr, buf_iova, buf_len;
978 uint32_t cpy_len, cpy_threshold;
980 struct rte_mbuf *hdr_mbuf;
981 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
982 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
990 if (unlikely(m == NULL)) {
995 cpy_threshold = vq->async_threshold;
997 buf_addr = buf_vec[vec_idx].buf_addr;
998 buf_iova = buf_vec[vec_idx].buf_iova;
999 buf_len = buf_vec[vec_idx].buf_len;
1001 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
1007 hdr_addr = buf_addr;
1008 if (unlikely(buf_len < dev->vhost_hlen))
1011 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
1013 VHOST_LOG_DATA(DEBUG, "(%d) RX: num merge buffers %d\n",
1014 dev->vid, num_buffers);
1016 if (unlikely(buf_len < dev->vhost_hlen)) {
1017 buf_offset = dev->vhost_hlen - buf_len;
1019 buf_addr = buf_vec[vec_idx].buf_addr;
1020 buf_iova = buf_vec[vec_idx].buf_iova;
1021 buf_len = buf_vec[vec_idx].buf_len;
1022 buf_avail = buf_len - buf_offset;
1024 buf_offset = dev->vhost_hlen;
1025 buf_avail = buf_len - dev->vhost_hlen;
1028 mbuf_avail = rte_pktmbuf_data_len(m);
1031 while (mbuf_avail != 0 || m->next != NULL) {
1032 /* done with current buf, get the next one */
1033 if (buf_avail == 0) {
1035 if (unlikely(vec_idx >= nr_vec)) {
1040 buf_addr = buf_vec[vec_idx].buf_addr;
1041 buf_iova = buf_vec[vec_idx].buf_iova;
1042 buf_len = buf_vec[vec_idx].buf_len;
1045 buf_avail = buf_len;
1048 /* done with current mbuf, get the next one */
1049 if (mbuf_avail == 0) {
1053 mbuf_avail = rte_pktmbuf_data_len(m);
1057 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
1058 if (rxvq_is_mergeable(dev))
1059 ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
1062 if (unlikely(hdr == &tmp_hdr)) {
1063 copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
1065 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
1066 dev->vhost_hlen, 0);
1067 vhost_log_cache_write_iova(dev, vq,
1068 buf_vec[0].buf_iova,
1075 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
1077 while (unlikely(cpy_len && cpy_len >= cpy_threshold)) {
1078 hpa = (void *)(uintptr_t)gpa_to_first_hpa(dev,
1079 buf_iova + buf_offset,
1080 cpy_len, &mapped_len);
1082 if (unlikely(!hpa || mapped_len < cpy_threshold))
1085 async_fill_vec(src_iovec + tvec_idx,
1086 (void *)(uintptr_t)rte_pktmbuf_iova_offset(m,
1087 mbuf_offset), (size_t)mapped_len);
1089 async_fill_vec(dst_iovec + tvec_idx,
1090 hpa, (size_t)mapped_len);
1092 tlen += (uint32_t)mapped_len;
1093 cpy_len -= (uint32_t)mapped_len;
1094 mbuf_avail -= (uint32_t)mapped_len;
1095 mbuf_offset += (uint32_t)mapped_len;
1096 buf_avail -= (uint32_t)mapped_len;
1097 buf_offset += (uint32_t)mapped_len;
1101 if (likely(cpy_len)) {
1102 if (unlikely(vq->batch_copy_nb_elems >= vq->size)) {
1104 (void *)((uintptr_t)(buf_addr + buf_offset)),
1105 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
1109 (uintptr_t)(buf_addr + buf_offset),
1112 batch_copy[vq->batch_copy_nb_elems].dst =
1113 (void *)((uintptr_t)(buf_addr + buf_offset));
1114 batch_copy[vq->batch_copy_nb_elems].src =
1115 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
1116 batch_copy[vq->batch_copy_nb_elems].log_addr =
1117 buf_iova + buf_offset;
1118 batch_copy[vq->batch_copy_nb_elems].len =
1120 vq->batch_copy_nb_elems++;
1123 mbuf_avail -= cpy_len;
1124 mbuf_offset += cpy_len;
1125 buf_avail -= cpy_len;
1126 buf_offset += cpy_len;
1132 async_fill_iter(src_it, tlen, src_iovec, tvec_idx);
1133 async_fill_iter(dst_it, tlen, dst_iovec, tvec_idx);
1138 static __rte_always_inline int
1139 vhost_enqueue_single_packed(struct virtio_net *dev,
1140 struct vhost_virtqueue *vq,
1141 struct rte_mbuf *pkt,
1142 struct buf_vector *buf_vec,
1145 uint16_t nr_vec = 0;
1146 uint16_t avail_idx = vq->last_avail_idx;
1147 uint16_t max_tries, tries = 0;
1148 uint16_t buf_id = 0;
1150 uint16_t desc_count;
1151 uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
1152 uint16_t num_buffers = 0;
1153 uint32_t buffer_len[vq->size];
1154 uint16_t buffer_buf_id[vq->size];
1155 uint16_t buffer_desc_count[vq->size];
1157 if (rxvq_is_mergeable(dev))
1158 max_tries = vq->size - 1;
1164 * if we tried all available ring items, and still
1165 * can't get enough buf, it means something abnormal
1168 if (unlikely(++tries > max_tries))
1171 if (unlikely(fill_vec_buf_packed(dev, vq,
1172 avail_idx, &desc_count,
1175 VHOST_ACCESS_RW) < 0))
1178 len = RTE_MIN(len, size);
1181 buffer_len[num_buffers] = len;
1182 buffer_buf_id[num_buffers] = buf_id;
1183 buffer_desc_count[num_buffers] = desc_count;
1186 *nr_descs += desc_count;
1187 avail_idx += desc_count;
1188 if (avail_idx >= vq->size)
1189 avail_idx -= vq->size;
1192 if (copy_mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, num_buffers) < 0)
1195 vhost_shadow_enqueue_single_packed(dev, vq, buffer_len, buffer_buf_id,
1196 buffer_desc_count, num_buffers);
1201 static __rte_noinline uint32_t
1202 virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
1203 struct rte_mbuf **pkts, uint32_t count)
1205 uint32_t pkt_idx = 0;
1206 uint16_t num_buffers;
1207 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1208 uint16_t avail_head;
1211 * The ordering between avail index and
1212 * desc reads needs to be enforced.
1214 avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
1216 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1218 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1219 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1220 uint16_t nr_vec = 0;
1222 if (unlikely(reserve_avail_buf_split(dev, vq,
1223 pkt_len, buf_vec, &num_buffers,
1224 avail_head, &nr_vec) < 0)) {
1225 VHOST_LOG_DATA(DEBUG,
1226 "(%d) failed to get enough desc from vring\n",
1228 vq->shadow_used_idx -= num_buffers;
1232 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1233 dev->vid, vq->last_avail_idx,
1234 vq->last_avail_idx + num_buffers);
1236 if (copy_mbuf_to_desc(dev, vq, pkts[pkt_idx],
1239 vq->shadow_used_idx -= num_buffers;
1243 vq->last_avail_idx += num_buffers;
1246 do_data_copy_enqueue(dev, vq);
1248 if (likely(vq->shadow_used_idx)) {
1249 flush_shadow_used_ring_split(dev, vq);
1250 vhost_vring_call_split(dev, vq);
1256 static __rte_always_inline int
1257 virtio_dev_rx_batch_packed(struct virtio_net *dev,
1258 struct vhost_virtqueue *vq,
1259 struct rte_mbuf **pkts)
1261 bool wrap_counter = vq->avail_wrap_counter;
1262 struct vring_packed_desc *descs = vq->desc_packed;
1263 uint16_t avail_idx = vq->last_avail_idx;
1264 uint64_t desc_addrs[PACKED_BATCH_SIZE];
1265 struct virtio_net_hdr_mrg_rxbuf *hdrs[PACKED_BATCH_SIZE];
1266 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1267 uint64_t lens[PACKED_BATCH_SIZE];
1268 uint16_t ids[PACKED_BATCH_SIZE];
1271 if (unlikely(avail_idx & PACKED_BATCH_MASK))
1274 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
1277 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1278 if (unlikely(pkts[i]->next != NULL))
1280 if (unlikely(!desc_is_avail(&descs[avail_idx + i],
1285 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1286 lens[i] = descs[avail_idx + i].len;
1288 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1289 if (unlikely(pkts[i]->pkt_len > (lens[i] - buf_offset)))
1293 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1294 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
1295 descs[avail_idx + i].addr,
1299 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1300 if (unlikely(!desc_addrs[i]))
1302 if (unlikely(lens[i] != descs[avail_idx + i].len))
1306 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1307 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
1308 hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)
1309 (uintptr_t)desc_addrs[i];
1310 lens[i] = pkts[i]->pkt_len +
1311 sizeof(struct virtio_net_hdr_mrg_rxbuf);
1314 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1315 virtio_enqueue_offload(pkts[i], &hdrs[i]->hdr);
1317 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
1319 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1320 rte_memcpy((void *)(uintptr_t)(desc_addrs[i] + buf_offset),
1321 rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
1325 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1326 vhost_log_cache_write_iova(dev, vq, descs[avail_idx + i].addr,
1329 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1330 ids[i] = descs[avail_idx + i].id;
1332 vhost_flush_enqueue_batch_packed(dev, vq, lens, ids);
1337 static __rte_always_inline int16_t
1338 virtio_dev_rx_single_packed(struct virtio_net *dev,
1339 struct vhost_virtqueue *vq,
1340 struct rte_mbuf *pkt)
1342 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1343 uint16_t nr_descs = 0;
1345 if (unlikely(vhost_enqueue_single_packed(dev, vq, pkt, buf_vec,
1347 VHOST_LOG_DATA(DEBUG,
1348 "(%d) failed to get enough desc from vring\n",
1353 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1354 dev->vid, vq->last_avail_idx,
1355 vq->last_avail_idx + nr_descs);
1357 vq_inc_last_avail_packed(vq, nr_descs);
1362 static __rte_noinline uint32_t
1363 virtio_dev_rx_packed(struct virtio_net *dev,
1364 struct vhost_virtqueue *__rte_restrict vq,
1365 struct rte_mbuf **__rte_restrict pkts,
1368 uint32_t pkt_idx = 0;
1369 uint32_t remained = count;
1372 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
1374 if (remained >= PACKED_BATCH_SIZE) {
1375 if (!virtio_dev_rx_batch_packed(dev, vq,
1377 pkt_idx += PACKED_BATCH_SIZE;
1378 remained -= PACKED_BATCH_SIZE;
1383 if (virtio_dev_rx_single_packed(dev, vq, pkts[pkt_idx]))
1388 } while (pkt_idx < count);
1390 if (vq->shadow_used_idx) {
1391 do_data_copy_enqueue(dev, vq);
1392 vhost_flush_enqueue_shadow_packed(dev, vq);
1396 vhost_vring_call_packed(dev, vq);
1401 static __rte_always_inline uint32_t
1402 virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
1403 struct rte_mbuf **pkts, uint32_t count)
1405 struct vhost_virtqueue *vq;
1408 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1409 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1410 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1411 dev->vid, __func__, queue_id);
1415 vq = dev->virtqueue[queue_id];
1417 rte_spinlock_lock(&vq->access_lock);
1419 if (unlikely(vq->enabled == 0))
1420 goto out_access_unlock;
1422 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1423 vhost_user_iotlb_rd_lock(vq);
1425 if (unlikely(vq->access_ok == 0))
1426 if (unlikely(vring_translate(dev, vq) < 0))
1429 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
1433 if (vq_is_packed(dev))
1434 nb_tx = virtio_dev_rx_packed(dev, vq, pkts, count);
1436 nb_tx = virtio_dev_rx_split(dev, vq, pkts, count);
1439 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1440 vhost_user_iotlb_rd_unlock(vq);
1443 rte_spinlock_unlock(&vq->access_lock);
1449 rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
1450 struct rte_mbuf **__rte_restrict pkts, uint16_t count)
1452 struct virtio_net *dev = get_device(vid);
1457 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
1459 "(%d) %s: built-in vhost net backend is disabled.\n",
1460 dev->vid, __func__);
1464 return virtio_dev_rx(dev, queue_id, pkts, count);
1467 static __rte_always_inline uint16_t
1468 virtio_dev_rx_async_get_info_idx(uint16_t pkts_idx,
1469 uint16_t vq_size, uint16_t n_inflight)
1471 return pkts_idx > n_inflight ? (pkts_idx - n_inflight) :
1472 (vq_size - n_inflight + pkts_idx) & (vq_size - 1);
1475 static __rte_noinline uint32_t
1476 virtio_dev_rx_async_submit_split(struct virtio_net *dev,
1477 struct vhost_virtqueue *vq, uint16_t queue_id,
1478 struct rte_mbuf **pkts, uint32_t count)
1480 uint32_t pkt_idx = 0, pkt_burst_idx = 0;
1481 uint16_t num_buffers;
1482 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1483 uint16_t avail_head;
1485 struct rte_vhost_iov_iter *it_pool = vq->it_pool;
1486 struct iovec *vec_pool = vq->vec_pool;
1487 struct rte_vhost_async_desc tdes[MAX_PKT_BURST];
1488 struct iovec *src_iovec = vec_pool;
1489 struct iovec *dst_iovec = vec_pool + (VHOST_MAX_ASYNC_VEC >> 1);
1490 struct rte_vhost_iov_iter *src_it = it_pool;
1491 struct rte_vhost_iov_iter *dst_it = it_pool + 1;
1492 uint16_t n_free_slot, slot_idx = 0;
1493 uint16_t pkt_err = 0;
1494 uint16_t segs_await = 0;
1495 struct async_inflight_info *pkts_info = vq->async_pkts_info;
1499 * The ordering between avail index and desc reads need to be enforced.
1501 avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
1503 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1505 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1506 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1507 uint16_t nr_vec = 0;
1509 if (unlikely(reserve_avail_buf_split(dev, vq,
1510 pkt_len, buf_vec, &num_buffers,
1511 avail_head, &nr_vec) < 0)) {
1512 VHOST_LOG_DATA(DEBUG,
1513 "(%d) failed to get enough desc from vring\n",
1515 vq->shadow_used_idx -= num_buffers;
1519 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1520 dev->vid, vq->last_avail_idx,
1521 vq->last_avail_idx + num_buffers);
1523 if (async_mbuf_to_desc(dev, vq, pkts[pkt_idx],
1524 buf_vec, nr_vec, num_buffers,
1525 src_iovec, dst_iovec, src_it, dst_it) < 0) {
1526 vq->shadow_used_idx -= num_buffers;
1530 slot_idx = (vq->async_pkts_idx + pkt_idx) & (vq->size - 1);
1531 if (src_it->count) {
1532 async_fill_desc(&tdes[pkt_burst_idx], src_it, dst_it);
1534 pkts_info[slot_idx].descs = num_buffers;
1535 pkts_info[slot_idx].segs = src_it->nr_segs;
1536 src_iovec += src_it->nr_segs;
1537 dst_iovec += dst_it->nr_segs;
1540 segs_await += src_it->nr_segs;
1542 pkts_info[slot_idx].info = num_buffers;
1543 vq->async_pkts_inflight_n++;
1546 vq->last_avail_idx += num_buffers;
1549 * conditions to trigger async device transfer:
1550 * - buffered packet number reaches transfer threshold
1551 * - this is the last packet in the burst enqueue
1552 * - unused async iov number is less than max vhost vector
1554 if (pkt_burst_idx >= VHOST_ASYNC_BATCH_THRESHOLD ||
1555 (pkt_idx == count - 1 && pkt_burst_idx) ||
1556 (VHOST_MAX_ASYNC_VEC / 2 - segs_await <
1558 n_pkts = vq->async_ops.transfer_data(dev->vid,
1559 queue_id, tdes, 0, pkt_burst_idx);
1560 src_iovec = vec_pool;
1561 dst_iovec = vec_pool + (VHOST_MAX_ASYNC_VEC >> 1);
1563 dst_it = it_pool + 1;
1565 vq->async_pkts_inflight_n += pkt_burst_idx;
1567 if (unlikely(n_pkts < (int)pkt_burst_idx)) {
1569 * log error packets number here and do actual
1570 * error processing when applications poll
1573 pkt_err = pkt_burst_idx - n_pkts;
1582 if (pkt_burst_idx) {
1583 n_pkts = vq->async_ops.transfer_data(dev->vid,
1584 queue_id, tdes, 0, pkt_burst_idx);
1585 vq->async_pkts_inflight_n += pkt_burst_idx;
1587 if (unlikely(n_pkts < (int)pkt_burst_idx))
1588 pkt_err = pkt_burst_idx - n_pkts;
1591 do_data_copy_enqueue(dev, vq);
1593 while (unlikely(pkt_err && pkt_idx)) {
1594 if (pkts_info[slot_idx].segs)
1596 vq->last_avail_idx -= pkts_info[slot_idx].descs;
1597 vq->shadow_used_idx -= pkts_info[slot_idx].descs;
1598 vq->async_pkts_inflight_n--;
1599 slot_idx = (slot_idx - 1) & (vq->size - 1);
1603 n_free_slot = vq->size - vq->async_pkts_idx;
1604 if (n_free_slot > pkt_idx) {
1605 rte_memcpy(&vq->async_pkts_pending[vq->async_pkts_idx],
1606 pkts, pkt_idx * sizeof(uintptr_t));
1607 vq->async_pkts_idx += pkt_idx;
1609 rte_memcpy(&vq->async_pkts_pending[vq->async_pkts_idx],
1610 pkts, n_free_slot * sizeof(uintptr_t));
1611 rte_memcpy(&vq->async_pkts_pending[0],
1613 (pkt_idx - n_free_slot) * sizeof(uintptr_t));
1614 vq->async_pkts_idx = pkt_idx - n_free_slot;
1617 if (likely(vq->shadow_used_idx))
1618 async_flush_shadow_used_ring_split(dev, vq);
1623 uint16_t rte_vhost_poll_enqueue_completed(int vid, uint16_t queue_id,
1624 struct rte_mbuf **pkts, uint16_t count)
1626 struct virtio_net *dev = get_device(vid);
1627 struct vhost_virtqueue *vq;
1628 uint16_t n_pkts_cpl = 0, n_pkts_put = 0, n_descs = 0;
1629 uint16_t start_idx, pkts_idx, vq_size;
1630 uint16_t n_inflight;
1631 struct async_inflight_info *pkts_info;
1636 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1637 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1638 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1639 dev->vid, __func__, queue_id);
1643 vq = dev->virtqueue[queue_id];
1645 if (unlikely(!vq->async_registered)) {
1646 VHOST_LOG_DATA(ERR, "(%d) %s: async not registered for queue id %d.\n",
1647 dev->vid, __func__, queue_id);
1651 rte_spinlock_lock(&vq->access_lock);
1653 n_inflight = vq->async_pkts_inflight_n;
1654 pkts_idx = vq->async_pkts_idx;
1655 pkts_info = vq->async_pkts_info;
1657 start_idx = virtio_dev_rx_async_get_info_idx(pkts_idx,
1658 vq_size, vq->async_pkts_inflight_n);
1660 if (count > vq->async_last_pkts_n)
1661 n_pkts_cpl = vq->async_ops.check_completed_copies(vid,
1662 queue_id, 0, count - vq->async_last_pkts_n);
1663 n_pkts_cpl += vq->async_last_pkts_n;
1667 while (likely((n_pkts_put < count) && n_inflight)) {
1668 uint16_t info_idx = (start_idx + n_pkts_put) & (vq_size - 1);
1669 if (n_pkts_cpl && pkts_info[info_idx].segs)
1671 else if (!n_pkts_cpl && pkts_info[info_idx].segs)
1675 n_descs += pkts_info[info_idx].descs;
1678 vq->async_last_pkts_n = n_pkts_cpl;
1681 vq->async_pkts_inflight_n = n_inflight;
1682 if (likely(vq->enabled && vq->access_ok)) {
1683 __atomic_add_fetch(&vq->used->idx,
1684 n_descs, __ATOMIC_RELEASE);
1685 vhost_vring_call_split(dev, vq);
1688 if (start_idx + n_pkts_put <= vq_size) {
1689 rte_memcpy(pkts, &vq->async_pkts_pending[start_idx],
1690 n_pkts_put * sizeof(uintptr_t));
1692 rte_memcpy(pkts, &vq->async_pkts_pending[start_idx],
1693 (vq_size - start_idx) * sizeof(uintptr_t));
1694 rte_memcpy(&pkts[vq_size - start_idx],
1695 vq->async_pkts_pending,
1696 (n_pkts_put + start_idx - vq_size) *
1701 rte_spinlock_unlock(&vq->access_lock);
1706 static __rte_always_inline uint32_t
1707 virtio_dev_rx_async_submit(struct virtio_net *dev, uint16_t queue_id,
1708 struct rte_mbuf **pkts, uint32_t count)
1710 struct vhost_virtqueue *vq;
1713 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1714 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1715 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1716 dev->vid, __func__, queue_id);
1720 vq = dev->virtqueue[queue_id];
1722 rte_spinlock_lock(&vq->access_lock);
1724 if (unlikely(vq->enabled == 0 || !vq->async_registered))
1725 goto out_access_unlock;
1727 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1728 vhost_user_iotlb_rd_lock(vq);
1730 if (unlikely(vq->access_ok == 0))
1731 if (unlikely(vring_translate(dev, vq) < 0))
1734 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
1738 /* TODO: packed queue not implemented */
1739 if (vq_is_packed(dev))
1742 nb_tx = virtio_dev_rx_async_submit_split(dev,
1743 vq, queue_id, pkts, count);
1746 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1747 vhost_user_iotlb_rd_unlock(vq);
1750 rte_spinlock_unlock(&vq->access_lock);
1756 rte_vhost_submit_enqueue_burst(int vid, uint16_t queue_id,
1757 struct rte_mbuf **pkts, uint16_t count)
1759 struct virtio_net *dev = get_device(vid);
1764 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
1766 "(%d) %s: built-in vhost net backend is disabled.\n",
1767 dev->vid, __func__);
1771 return virtio_dev_rx_async_submit(dev, queue_id, pkts, count);
1775 virtio_net_with_host_offload(struct virtio_net *dev)
1778 ((1ULL << VIRTIO_NET_F_CSUM) |
1779 (1ULL << VIRTIO_NET_F_HOST_ECN) |
1780 (1ULL << VIRTIO_NET_F_HOST_TSO4) |
1781 (1ULL << VIRTIO_NET_F_HOST_TSO6) |
1782 (1ULL << VIRTIO_NET_F_HOST_UFO)))
1789 parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
1791 struct rte_ipv4_hdr *ipv4_hdr;
1792 struct rte_ipv6_hdr *ipv6_hdr;
1793 void *l3_hdr = NULL;
1794 struct rte_ether_hdr *eth_hdr;
1797 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
1799 m->l2_len = sizeof(struct rte_ether_hdr);
1800 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
1802 if (ethertype == RTE_ETHER_TYPE_VLAN) {
1803 struct rte_vlan_hdr *vlan_hdr =
1804 (struct rte_vlan_hdr *)(eth_hdr + 1);
1806 m->l2_len += sizeof(struct rte_vlan_hdr);
1807 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
1810 l3_hdr = (char *)eth_hdr + m->l2_len;
1812 switch (ethertype) {
1813 case RTE_ETHER_TYPE_IPV4:
1815 *l4_proto = ipv4_hdr->next_proto_id;
1816 m->l3_len = rte_ipv4_hdr_len(ipv4_hdr);
1817 *l4_hdr = (char *)l3_hdr + m->l3_len;
1818 m->ol_flags |= PKT_TX_IPV4;
1820 case RTE_ETHER_TYPE_IPV6:
1822 *l4_proto = ipv6_hdr->proto;
1823 m->l3_len = sizeof(struct rte_ipv6_hdr);
1824 *l4_hdr = (char *)l3_hdr + m->l3_len;
1825 m->ol_flags |= PKT_TX_IPV6;
1835 static __rte_always_inline void
1836 vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
1838 uint16_t l4_proto = 0;
1839 void *l4_hdr = NULL;
1840 struct rte_tcp_hdr *tcp_hdr = NULL;
1842 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1845 parse_ethernet(m, &l4_proto, &l4_hdr);
1846 if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1847 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
1848 switch (hdr->csum_offset) {
1849 case (offsetof(struct rte_tcp_hdr, cksum)):
1850 if (l4_proto == IPPROTO_TCP)
1851 m->ol_flags |= PKT_TX_TCP_CKSUM;
1853 case (offsetof(struct rte_udp_hdr, dgram_cksum)):
1854 if (l4_proto == IPPROTO_UDP)
1855 m->ol_flags |= PKT_TX_UDP_CKSUM;
1857 case (offsetof(struct rte_sctp_hdr, cksum)):
1858 if (l4_proto == IPPROTO_SCTP)
1859 m->ol_flags |= PKT_TX_SCTP_CKSUM;
1867 if (l4_hdr && hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1868 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1869 case VIRTIO_NET_HDR_GSO_TCPV4:
1870 case VIRTIO_NET_HDR_GSO_TCPV6:
1872 m->ol_flags |= PKT_TX_TCP_SEG;
1873 m->tso_segsz = hdr->gso_size;
1874 m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
1876 case VIRTIO_NET_HDR_GSO_UDP:
1877 m->ol_flags |= PKT_TX_UDP_SEG;
1878 m->tso_segsz = hdr->gso_size;
1879 m->l4_len = sizeof(struct rte_udp_hdr);
1882 VHOST_LOG_DATA(WARNING,
1883 "unsupported gso type %u.\n", hdr->gso_type);
1889 static __rte_noinline void
1890 copy_vnet_hdr_from_desc(struct virtio_net_hdr *hdr,
1891 struct buf_vector *buf_vec)
1894 uint64_t remain = sizeof(struct virtio_net_hdr);
1896 uint64_t dst = (uint64_t)(uintptr_t)hdr;
1899 len = RTE_MIN(remain, buf_vec->buf_len);
1900 src = buf_vec->buf_addr;
1901 rte_memcpy((void *)(uintptr_t)dst,
1902 (void *)(uintptr_t)src, len);
1910 static __rte_always_inline int
1911 copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
1912 struct buf_vector *buf_vec, uint16_t nr_vec,
1913 struct rte_mbuf *m, struct rte_mempool *mbuf_pool)
1915 uint32_t buf_avail, buf_offset;
1916 uint64_t buf_addr, buf_len;
1917 uint32_t mbuf_avail, mbuf_offset;
1919 struct rte_mbuf *cur = m, *prev = m;
1920 struct virtio_net_hdr tmp_hdr;
1921 struct virtio_net_hdr *hdr = NULL;
1922 /* A counter to avoid desc dead loop chain */
1923 uint16_t vec_idx = 0;
1924 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
1927 buf_addr = buf_vec[vec_idx].buf_addr;
1928 buf_len = buf_vec[vec_idx].buf_len;
1930 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
1935 if (virtio_net_with_host_offload(dev)) {
1936 if (unlikely(buf_len < sizeof(struct virtio_net_hdr))) {
1938 * No luck, the virtio-net header doesn't fit
1939 * in a contiguous virtual area.
1941 copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec);
1944 hdr = (struct virtio_net_hdr *)((uintptr_t)buf_addr);
1949 * A virtio driver normally uses at least 2 desc buffers
1950 * for Tx: the first for storing the header, and others
1951 * for storing the data.
1953 if (unlikely(buf_len < dev->vhost_hlen)) {
1954 buf_offset = dev->vhost_hlen - buf_len;
1956 buf_addr = buf_vec[vec_idx].buf_addr;
1957 buf_len = buf_vec[vec_idx].buf_len;
1958 buf_avail = buf_len - buf_offset;
1959 } else if (buf_len == dev->vhost_hlen) {
1960 if (unlikely(++vec_idx >= nr_vec))
1962 buf_addr = buf_vec[vec_idx].buf_addr;
1963 buf_len = buf_vec[vec_idx].buf_len;
1966 buf_avail = buf_len;
1968 buf_offset = dev->vhost_hlen;
1969 buf_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
1973 (uintptr_t)(buf_addr + buf_offset),
1974 (uint32_t)buf_avail, 0);
1977 mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
1979 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
1981 if (likely(cpy_len > MAX_BATCH_LEN ||
1982 vq->batch_copy_nb_elems >= vq->size ||
1983 (hdr && cur == m))) {
1984 rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
1986 (void *)((uintptr_t)(buf_addr +
1987 buf_offset)), cpy_len);
1989 batch_copy[vq->batch_copy_nb_elems].dst =
1990 rte_pktmbuf_mtod_offset(cur, void *,
1992 batch_copy[vq->batch_copy_nb_elems].src =
1993 (void *)((uintptr_t)(buf_addr + buf_offset));
1994 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
1995 vq->batch_copy_nb_elems++;
1998 mbuf_avail -= cpy_len;
1999 mbuf_offset += cpy_len;
2000 buf_avail -= cpy_len;
2001 buf_offset += cpy_len;
2003 /* This buf reaches to its end, get the next one */
2004 if (buf_avail == 0) {
2005 if (++vec_idx >= nr_vec)
2008 buf_addr = buf_vec[vec_idx].buf_addr;
2009 buf_len = buf_vec[vec_idx].buf_len;
2012 buf_avail = buf_len;
2014 PRINT_PACKET(dev, (uintptr_t)buf_addr,
2015 (uint32_t)buf_avail, 0);
2019 * This mbuf reaches to its end, get a new one
2020 * to hold more data.
2022 if (mbuf_avail == 0) {
2023 cur = rte_pktmbuf_alloc(mbuf_pool);
2024 if (unlikely(cur == NULL)) {
2025 VHOST_LOG_DATA(ERR, "Failed to "
2026 "allocate memory for mbuf.\n");
2032 prev->data_len = mbuf_offset;
2034 m->pkt_len += mbuf_offset;
2038 mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
2042 prev->data_len = mbuf_offset;
2043 m->pkt_len += mbuf_offset;
2046 vhost_dequeue_offload(hdr, m);
2054 virtio_dev_extbuf_free(void *addr __rte_unused, void *opaque)
2060 virtio_dev_extbuf_alloc(struct rte_mbuf *pkt, uint32_t size)
2062 struct rte_mbuf_ext_shared_info *shinfo = NULL;
2063 uint32_t total_len = RTE_PKTMBUF_HEADROOM + size;
2068 total_len += sizeof(*shinfo) + sizeof(uintptr_t);
2069 total_len = RTE_ALIGN_CEIL(total_len, sizeof(uintptr_t));
2071 if (unlikely(total_len > UINT16_MAX))
2074 buf_len = total_len;
2075 buf = rte_malloc(NULL, buf_len, RTE_CACHE_LINE_SIZE);
2076 if (unlikely(buf == NULL))
2079 /* Initialize shinfo */
2080 shinfo = rte_pktmbuf_ext_shinfo_init_helper(buf, &buf_len,
2081 virtio_dev_extbuf_free, buf);
2082 if (unlikely(shinfo == NULL)) {
2084 VHOST_LOG_DATA(ERR, "Failed to init shinfo\n");
2088 iova = rte_malloc_virt2iova(buf);
2089 rte_pktmbuf_attach_extbuf(pkt, buf, iova, buf_len, shinfo);
2090 rte_pktmbuf_reset_headroom(pkt);
2096 * Allocate a host supported pktmbuf.
2098 static __rte_always_inline struct rte_mbuf *
2099 virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
2102 struct rte_mbuf *pkt = rte_pktmbuf_alloc(mp);
2104 if (unlikely(pkt == NULL)) {
2106 "Failed to allocate memory for mbuf.\n");
2110 if (rte_pktmbuf_tailroom(pkt) >= data_len)
2113 /* attach an external buffer if supported */
2114 if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
2117 /* check if chained buffers are allowed */
2118 if (!dev->linearbuf)
2121 /* Data doesn't fit into the buffer and the host supports
2122 * only linear buffers
2124 rte_pktmbuf_free(pkt);
2129 static __rte_noinline uint16_t
2130 virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
2131 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
2134 uint16_t free_entries;
2135 uint16_t dropped = 0;
2136 static bool allocerr_warned;
2139 * The ordering between avail index and
2140 * desc reads needs to be enforced.
2142 free_entries = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE) -
2144 if (free_entries == 0)
2147 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
2149 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
2151 count = RTE_MIN(count, MAX_PKT_BURST);
2152 count = RTE_MIN(count, free_entries);
2153 VHOST_LOG_DATA(DEBUG, "(%d) about to dequeue %u buffers\n",
2156 for (i = 0; i < count; i++) {
2157 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2160 uint16_t nr_vec = 0;
2163 if (unlikely(fill_vec_buf_split(dev, vq,
2164 vq->last_avail_idx + i,
2166 &head_idx, &buf_len,
2167 VHOST_ACCESS_RO) < 0))
2170 update_shadow_used_ring_split(vq, head_idx, 0);
2172 pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
2173 if (unlikely(pkts[i] == NULL)) {
2175 * mbuf allocation fails for jumbo packets when external
2176 * buffer allocation is not allowed and linear buffer
2177 * is required. Drop this packet.
2179 if (!allocerr_warned) {
2181 "Failed mbuf alloc of size %d from %s on %s.\n",
2182 buf_len, mbuf_pool->name, dev->ifname);
2183 allocerr_warned = true;
2190 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts[i],
2192 if (unlikely(err)) {
2193 rte_pktmbuf_free(pkts[i]);
2194 if (!allocerr_warned) {
2196 "Failed to copy desc to mbuf on %s.\n",
2198 allocerr_warned = true;
2206 vq->last_avail_idx += i;
2208 do_data_copy_dequeue(vq);
2209 if (unlikely(i < count))
2210 vq->shadow_used_idx = i;
2211 if (likely(vq->shadow_used_idx)) {
2212 flush_shadow_used_ring_split(dev, vq);
2213 vhost_vring_call_split(dev, vq);
2216 return (i - dropped);
2219 static __rte_always_inline int
2220 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
2221 struct vhost_virtqueue *vq,
2222 struct rte_mempool *mbuf_pool,
2223 struct rte_mbuf **pkts,
2225 uintptr_t *desc_addrs,
2228 bool wrap = vq->avail_wrap_counter;
2229 struct vring_packed_desc *descs = vq->desc_packed;
2230 struct virtio_net_hdr *hdr;
2231 uint64_t lens[PACKED_BATCH_SIZE];
2232 uint64_t buf_lens[PACKED_BATCH_SIZE];
2233 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2236 if (unlikely(avail_idx & PACKED_BATCH_MASK))
2238 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
2241 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2242 flags = descs[avail_idx + i].flags;
2243 if (unlikely((wrap != !!(flags & VRING_DESC_F_AVAIL)) ||
2244 (wrap == !!(flags & VRING_DESC_F_USED)) ||
2245 (flags & PACKED_DESC_SINGLE_DEQUEUE_FLAG)))
2251 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2252 lens[i] = descs[avail_idx + i].len;
2254 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2255 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
2256 descs[avail_idx + i].addr,
2257 &lens[i], VHOST_ACCESS_RW);
2260 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2261 if (unlikely(!desc_addrs[i]))
2263 if (unlikely((lens[i] != descs[avail_idx + i].len)))
2267 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2268 pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
2273 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2274 buf_lens[i] = pkts[i]->buf_len - pkts[i]->data_off;
2276 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2277 if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
2281 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2282 pkts[i]->pkt_len = descs[avail_idx + i].len - buf_offset;
2283 pkts[i]->data_len = pkts[i]->pkt_len;
2284 ids[i] = descs[avail_idx + i].id;
2287 if (virtio_net_with_host_offload(dev)) {
2288 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2289 hdr = (struct virtio_net_hdr *)(desc_addrs[i]);
2290 vhost_dequeue_offload(hdr, pkts[i]);
2297 for (i = 0; i < PACKED_BATCH_SIZE; i++)
2298 rte_pktmbuf_free(pkts[i]);
2303 static __rte_always_inline int
2304 virtio_dev_tx_batch_packed(struct virtio_net *dev,
2305 struct vhost_virtqueue *vq,
2306 struct rte_mempool *mbuf_pool,
2307 struct rte_mbuf **pkts)
2309 uint16_t avail_idx = vq->last_avail_idx;
2310 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2311 uintptr_t desc_addrs[PACKED_BATCH_SIZE];
2312 uint16_t ids[PACKED_BATCH_SIZE];
2315 if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
2316 avail_idx, desc_addrs, ids))
2319 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2320 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
2322 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2323 rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
2324 (void *)(uintptr_t)(desc_addrs[i] + buf_offset),
2327 if (virtio_net_is_inorder(dev))
2328 vhost_shadow_dequeue_batch_packed_inorder(vq,
2329 ids[PACKED_BATCH_SIZE - 1]);
2331 vhost_shadow_dequeue_batch_packed(dev, vq, ids);
2333 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
2338 static __rte_always_inline int
2339 vhost_dequeue_single_packed(struct virtio_net *dev,
2340 struct vhost_virtqueue *vq,
2341 struct rte_mempool *mbuf_pool,
2342 struct rte_mbuf **pkts,
2344 uint16_t *desc_count)
2346 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2348 uint16_t nr_vec = 0;
2350 static bool allocerr_warned;
2352 if (unlikely(fill_vec_buf_packed(dev, vq,
2353 vq->last_avail_idx, desc_count,
2356 VHOST_ACCESS_RO) < 0))
2359 *pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
2360 if (unlikely(*pkts == NULL)) {
2361 if (!allocerr_warned) {
2363 "Failed mbuf alloc of size %d from %s on %s.\n",
2364 buf_len, mbuf_pool->name, dev->ifname);
2365 allocerr_warned = true;
2370 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
2372 if (unlikely(err)) {
2373 if (!allocerr_warned) {
2375 "Failed to copy desc to mbuf on %s.\n",
2377 allocerr_warned = true;
2379 rte_pktmbuf_free(*pkts);
2386 static __rte_always_inline int
2387 virtio_dev_tx_single_packed(struct virtio_net *dev,
2388 struct vhost_virtqueue *vq,
2389 struct rte_mempool *mbuf_pool,
2390 struct rte_mbuf **pkts)
2393 uint16_t buf_id, desc_count = 0;
2396 ret = vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id,
2399 if (likely(desc_count > 0)) {
2400 if (virtio_net_is_inorder(dev))
2401 vhost_shadow_dequeue_single_packed_inorder(vq, buf_id,
2404 vhost_shadow_dequeue_single_packed(vq, buf_id,
2407 vq_inc_last_avail_packed(vq, desc_count);
2413 static __rte_noinline uint16_t
2414 virtio_dev_tx_packed(struct virtio_net *dev,
2415 struct vhost_virtqueue *__rte_restrict vq,
2416 struct rte_mempool *mbuf_pool,
2417 struct rte_mbuf **__rte_restrict pkts,
2420 uint32_t pkt_idx = 0;
2421 uint32_t remained = count;
2424 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
2426 if (remained >= PACKED_BATCH_SIZE) {
2427 if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
2429 pkt_idx += PACKED_BATCH_SIZE;
2430 remained -= PACKED_BATCH_SIZE;
2435 if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
2443 if (vq->shadow_used_idx) {
2444 do_data_copy_dequeue(vq);
2446 vhost_flush_dequeue_shadow_packed(dev, vq);
2447 vhost_vring_call_packed(dev, vq);
2454 rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
2455 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
2457 struct virtio_net *dev;
2458 struct rte_mbuf *rarp_mbuf = NULL;
2459 struct vhost_virtqueue *vq;
2460 int16_t success = 1;
2462 dev = get_device(vid);
2466 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
2468 "(%d) %s: built-in vhost net backend is disabled.\n",
2469 dev->vid, __func__);
2473 if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
2475 "(%d) %s: invalid virtqueue idx %d.\n",
2476 dev->vid, __func__, queue_id);
2480 vq = dev->virtqueue[queue_id];
2482 if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0))
2485 if (unlikely(vq->enabled == 0)) {
2487 goto out_access_unlock;
2490 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2491 vhost_user_iotlb_rd_lock(vq);
2493 if (unlikely(vq->access_ok == 0))
2494 if (unlikely(vring_translate(dev, vq) < 0)) {
2500 * Construct a RARP broadcast packet, and inject it to the "pkts"
2501 * array, to looks like that guest actually send such packet.
2503 * Check user_send_rarp() for more information.
2505 * broadcast_rarp shares a cacheline in the virtio_net structure
2506 * with some fields that are accessed during enqueue and
2507 * __atomic_compare_exchange_n causes a write if performed compare
2508 * and exchange. This could result in false sharing between enqueue
2511 * Prevent unnecessary false sharing by reading broadcast_rarp first
2512 * and only performing compare and exchange if the read indicates it
2513 * is likely to be set.
2515 if (unlikely(__atomic_load_n(&dev->broadcast_rarp, __ATOMIC_ACQUIRE) &&
2516 __atomic_compare_exchange_n(&dev->broadcast_rarp,
2517 &success, 0, 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED))) {
2519 rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac);
2520 if (rarp_mbuf == NULL) {
2521 VHOST_LOG_DATA(ERR, "Failed to make RARP packet.\n");
2528 if (vq_is_packed(dev))
2529 count = virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, count);
2531 count = virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count);
2534 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2535 vhost_user_iotlb_rd_unlock(vq);
2538 rte_spinlock_unlock(&vq->access_lock);
2540 if (unlikely(rarp_mbuf != NULL)) {
2542 * Inject it to the head of "pkts" array, so that switch's mac
2543 * learning table will get updated first.
2545 memmove(&pkts[1], pkts, count * sizeof(struct rte_mbuf *));
2546 pkts[0] = rarp_mbuf;