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>
24 #define MAX_PKT_BURST 32
26 #define MAX_BATCH_LEN 256
28 static __rte_always_inline bool
29 rxvq_is_mergeable(struct virtio_net *dev)
31 return dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF);
34 static __rte_always_inline bool
35 virtio_net_is_inorder(struct virtio_net *dev)
37 return dev->features & (1ULL << VIRTIO_F_IN_ORDER);
41 is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
43 return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
47 do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq)
49 struct batch_copy_elem *elem = vq->batch_copy_elems;
50 uint16_t count = vq->batch_copy_nb_elems;
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,
57 PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0);
60 vq->batch_copy_nb_elems = 0;
64 do_data_copy_dequeue(struct vhost_virtqueue *vq)
66 struct batch_copy_elem *elem = vq->batch_copy_elems;
67 uint16_t count = vq->batch_copy_nb_elems;
70 for (i = 0; i < count; i++)
71 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
73 vq->batch_copy_nb_elems = 0;
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)
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));
89 static __rte_always_inline void
90 flush_shadow_used_ring_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
92 uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
94 if (used_idx + vq->shadow_used_idx <= vq->size) {
95 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0,
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);
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);
108 vq->last_used_idx += vq->shadow_used_idx;
110 vhost_log_cache_sync(dev, vq);
112 __atomic_add_fetch(&vq->used->idx, vq->shadow_used_idx,
114 vq->shadow_used_idx = 0;
115 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
116 sizeof(vq->used->idx));
119 static __rte_always_inline void
120 update_shadow_used_ring_split(struct vhost_virtqueue *vq,
121 uint16_t desc_idx, uint32_t len)
123 uint16_t i = vq->shadow_used_idx++;
125 vq->shadow_used_split[i].id = desc_idx;
126 vq->shadow_used_split[i].len = len;
129 static __rte_always_inline void
130 vhost_flush_enqueue_shadow_packed(struct virtio_net *dev,
131 struct vhost_virtqueue *vq)
134 uint16_t used_idx = vq->last_used_idx;
135 uint16_t head_idx = vq->last_used_idx;
136 uint16_t head_flags = 0;
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;
143 used_idx += vq->shadow_used_packed[i].count;
144 if (used_idx >= vq->size)
145 used_idx -= vq->size;
150 for (i = 0; i < vq->shadow_used_idx; i++) {
153 if (vq->shadow_used_packed[i].len)
154 flags = VRING_DESC_F_WRITE;
158 if (vq->used_wrap_counter) {
159 flags |= VRING_DESC_F_USED;
160 flags |= VRING_DESC_F_AVAIL;
162 flags &= ~VRING_DESC_F_USED;
163 flags &= ~VRING_DESC_F_AVAIL;
167 vq->desc_packed[vq->last_used_idx].flags = flags;
169 vhost_log_cache_used_vring(dev, vq,
171 sizeof(struct vring_packed_desc),
172 sizeof(struct vring_packed_desc));
174 head_idx = vq->last_used_idx;
178 vq_inc_last_used_packed(vq, vq->shadow_used_packed[i].count);
181 vq->desc_packed[head_idx].flags = head_flags;
183 vhost_log_cache_used_vring(dev, vq,
185 sizeof(struct vring_packed_desc),
186 sizeof(struct vring_packed_desc));
188 vq->shadow_used_idx = 0;
189 vhost_log_cache_sync(dev, vq);
192 static __rte_always_inline void
193 vhost_flush_dequeue_shadow_packed(struct virtio_net *dev,
194 struct vhost_virtqueue *vq)
196 struct vring_used_elem_packed *used_elem = &vq->shadow_used_packed[0];
198 vq->desc_packed[vq->shadow_last_used_idx].id = used_elem->id;
200 vq->desc_packed[vq->shadow_last_used_idx].flags = used_elem->flags;
202 vhost_log_cache_used_vring(dev, vq, vq->shadow_last_used_idx *
203 sizeof(struct vring_packed_desc),
204 sizeof(struct vring_packed_desc));
205 vq->shadow_used_idx = 0;
206 vhost_log_cache_sync(dev, vq);
209 static __rte_always_inline void
210 vhost_flush_enqueue_batch_packed(struct virtio_net *dev,
211 struct vhost_virtqueue *vq,
218 if (vq->shadow_used_idx) {
219 do_data_copy_enqueue(dev, vq);
220 vhost_flush_enqueue_shadow_packed(dev, vq);
223 flags = PACKED_DESC_ENQUEUE_USED_FLAG(vq->used_wrap_counter);
225 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
226 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
227 vq->desc_packed[vq->last_used_idx + i].len = lens[i];
232 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
233 vq->desc_packed[vq->last_used_idx + i].flags = flags;
235 vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
236 sizeof(struct vring_packed_desc),
237 sizeof(struct vring_packed_desc) *
239 vhost_log_cache_sync(dev, vq);
241 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
244 static __rte_always_inline void
245 vhost_shadow_dequeue_batch_packed_inorder(struct vhost_virtqueue *vq,
248 vq->shadow_used_packed[0].id = id;
250 if (!vq->shadow_used_idx) {
251 vq->shadow_last_used_idx = vq->last_used_idx;
252 vq->shadow_used_packed[0].flags =
253 PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
254 vq->shadow_used_packed[0].len = 0;
255 vq->shadow_used_packed[0].count = 1;
256 vq->shadow_used_idx++;
259 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
262 static __rte_always_inline void
263 vhost_shadow_dequeue_batch_packed(struct virtio_net *dev,
264 struct vhost_virtqueue *vq,
271 flags = PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
273 if (!vq->shadow_used_idx) {
274 vq->shadow_last_used_idx = vq->last_used_idx;
275 vq->shadow_used_packed[0].id = ids[0];
276 vq->shadow_used_packed[0].len = 0;
277 vq->shadow_used_packed[0].count = 1;
278 vq->shadow_used_packed[0].flags = flags;
279 vq->shadow_used_idx++;
284 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE) {
285 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
286 vq->desc_packed[vq->last_used_idx + i].len = 0;
290 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE)
291 vq->desc_packed[vq->last_used_idx + i].flags = flags;
293 vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
294 sizeof(struct vring_packed_desc),
295 sizeof(struct vring_packed_desc) *
297 vhost_log_cache_sync(dev, vq);
299 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
302 static __rte_always_inline void
303 vhost_shadow_dequeue_single_packed(struct vhost_virtqueue *vq,
309 flags = vq->desc_packed[vq->last_used_idx].flags;
310 if (vq->used_wrap_counter) {
311 flags |= VRING_DESC_F_USED;
312 flags |= VRING_DESC_F_AVAIL;
314 flags &= ~VRING_DESC_F_USED;
315 flags &= ~VRING_DESC_F_AVAIL;
318 if (!vq->shadow_used_idx) {
319 vq->shadow_last_used_idx = vq->last_used_idx;
321 vq->shadow_used_packed[0].id = buf_id;
322 vq->shadow_used_packed[0].len = 0;
323 vq->shadow_used_packed[0].flags = flags;
324 vq->shadow_used_idx++;
326 vq->desc_packed[vq->last_used_idx].id = buf_id;
327 vq->desc_packed[vq->last_used_idx].len = 0;
328 vq->desc_packed[vq->last_used_idx].flags = flags;
331 vq_inc_last_used_packed(vq, count);
334 static __rte_always_inline void
335 vhost_shadow_dequeue_single_packed_inorder(struct vhost_virtqueue *vq,
341 vq->shadow_used_packed[0].id = buf_id;
343 flags = vq->desc_packed[vq->last_used_idx].flags;
344 if (vq->used_wrap_counter) {
345 flags |= VRING_DESC_F_USED;
346 flags |= VRING_DESC_F_AVAIL;
348 flags &= ~VRING_DESC_F_USED;
349 flags &= ~VRING_DESC_F_AVAIL;
352 if (!vq->shadow_used_idx) {
353 vq->shadow_last_used_idx = vq->last_used_idx;
354 vq->shadow_used_packed[0].len = 0;
355 vq->shadow_used_packed[0].flags = flags;
356 vq->shadow_used_idx++;
359 vq_inc_last_used_packed(vq, count);
362 static __rte_always_inline void
363 vhost_shadow_enqueue_single_packed(struct virtio_net *dev,
364 struct vhost_virtqueue *vq,
368 uint16_t num_buffers)
371 for (i = 0; i < num_buffers; i++) {
372 /* enqueue shadow flush action aligned with batch num */
373 if (!vq->shadow_used_idx)
374 vq->shadow_aligned_idx = vq->last_used_idx &
376 vq->shadow_used_packed[vq->shadow_used_idx].id = id[i];
377 vq->shadow_used_packed[vq->shadow_used_idx].len = len[i];
378 vq->shadow_used_packed[vq->shadow_used_idx].count = count[i];
379 vq->shadow_aligned_idx += count[i];
380 vq->shadow_used_idx++;
383 if (vq->shadow_aligned_idx >= PACKED_BATCH_SIZE) {
384 do_data_copy_enqueue(dev, vq);
385 vhost_flush_enqueue_shadow_packed(dev, vq);
389 /* avoid write operation when necessary, to lessen cache issues */
390 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
391 if ((var) != (val)) \
395 static __rte_always_inline void
396 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
398 uint64_t csum_l4 = m_buf->ol_flags & PKT_TX_L4_MASK;
400 if (m_buf->ol_flags & PKT_TX_TCP_SEG)
401 csum_l4 |= PKT_TX_TCP_CKSUM;
404 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
405 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
408 case PKT_TX_TCP_CKSUM:
409 net_hdr->csum_offset = (offsetof(struct rte_tcp_hdr,
412 case PKT_TX_UDP_CKSUM:
413 net_hdr->csum_offset = (offsetof(struct rte_udp_hdr,
416 case PKT_TX_SCTP_CKSUM:
417 net_hdr->csum_offset = (offsetof(struct rte_sctp_hdr,
422 ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
423 ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
424 ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
427 /* IP cksum verification cannot be bypassed, then calculate here */
428 if (m_buf->ol_flags & PKT_TX_IP_CKSUM) {
429 struct rte_ipv4_hdr *ipv4_hdr;
431 ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct rte_ipv4_hdr *,
433 ipv4_hdr->hdr_checksum = 0;
434 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
437 if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
438 if (m_buf->ol_flags & PKT_TX_IPV4)
439 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
441 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
442 net_hdr->gso_size = m_buf->tso_segsz;
443 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
445 } else if (m_buf->ol_flags & PKT_TX_UDP_SEG) {
446 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
447 net_hdr->gso_size = m_buf->tso_segsz;
448 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len +
451 ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
452 ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
453 ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
457 static __rte_always_inline int
458 map_one_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
459 struct buf_vector *buf_vec, uint16_t *vec_idx,
460 uint64_t desc_iova, uint64_t desc_len, uint8_t perm)
462 uint16_t vec_id = *vec_idx;
466 uint64_t desc_chunck_len = desc_len;
468 if (unlikely(vec_id >= BUF_VECTOR_MAX))
471 desc_addr = vhost_iova_to_vva(dev, vq,
475 if (unlikely(!desc_addr))
478 rte_prefetch0((void *)(uintptr_t)desc_addr);
480 buf_vec[vec_id].buf_iova = desc_iova;
481 buf_vec[vec_id].buf_addr = desc_addr;
482 buf_vec[vec_id].buf_len = desc_chunck_len;
484 desc_len -= desc_chunck_len;
485 desc_iova += desc_chunck_len;
493 static __rte_always_inline int
494 fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
495 uint32_t avail_idx, uint16_t *vec_idx,
496 struct buf_vector *buf_vec, uint16_t *desc_chain_head,
497 uint32_t *desc_chain_len, uint8_t perm)
499 uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
500 uint16_t vec_id = *vec_idx;
503 uint32_t nr_descs = vq->size;
505 struct vring_desc *descs = vq->desc;
506 struct vring_desc *idesc = NULL;
508 if (unlikely(idx >= vq->size))
511 *desc_chain_head = idx;
513 if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
514 dlen = vq->desc[idx].len;
515 nr_descs = dlen / sizeof(struct vring_desc);
516 if (unlikely(nr_descs > vq->size))
519 descs = (struct vring_desc *)(uintptr_t)
520 vhost_iova_to_vva(dev, vq, vq->desc[idx].addr,
523 if (unlikely(!descs))
526 if (unlikely(dlen < vq->desc[idx].len)) {
528 * The indirect desc table is not contiguous
529 * in process VA space, we have to copy it.
531 idesc = vhost_alloc_copy_ind_table(dev, vq,
532 vq->desc[idx].addr, vq->desc[idx].len);
533 if (unlikely(!idesc))
543 if (unlikely(idx >= nr_descs || cnt++ >= nr_descs)) {
544 free_ind_table(idesc);
548 len += descs[idx].len;
550 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
551 descs[idx].addr, descs[idx].len,
553 free_ind_table(idesc);
557 if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
560 idx = descs[idx].next;
563 *desc_chain_len = len;
566 if (unlikely(!!idesc))
567 free_ind_table(idesc);
573 * Returns -1 on fail, 0 on success
576 reserve_avail_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
577 uint32_t size, struct buf_vector *buf_vec,
578 uint16_t *num_buffers, uint16_t avail_head,
582 uint16_t vec_idx = 0;
583 uint16_t max_tries, tries = 0;
585 uint16_t head_idx = 0;
589 cur_idx = vq->last_avail_idx;
591 if (rxvq_is_mergeable(dev))
592 max_tries = vq->size - 1;
597 if (unlikely(cur_idx == avail_head))
600 * if we tried all available ring items, and still
601 * can't get enough buf, it means something abnormal
604 if (unlikely(++tries > max_tries))
607 if (unlikely(fill_vec_buf_split(dev, vq, cur_idx,
610 VHOST_ACCESS_RW) < 0))
612 len = RTE_MIN(len, size);
613 update_shadow_used_ring_split(vq, head_idx, len);
625 static __rte_always_inline int
626 fill_vec_buf_packed_indirect(struct virtio_net *dev,
627 struct vhost_virtqueue *vq,
628 struct vring_packed_desc *desc, uint16_t *vec_idx,
629 struct buf_vector *buf_vec, uint32_t *len, uint8_t perm)
633 uint16_t vec_id = *vec_idx;
635 struct vring_packed_desc *descs, *idescs = NULL;
638 descs = (struct vring_packed_desc *)(uintptr_t)
639 vhost_iova_to_vva(dev, vq, desc->addr, &dlen, VHOST_ACCESS_RO);
640 if (unlikely(!descs))
643 if (unlikely(dlen < desc->len)) {
645 * The indirect desc table is not contiguous
646 * in process VA space, we have to copy it.
648 idescs = vhost_alloc_copy_ind_table(dev,
649 vq, desc->addr, desc->len);
650 if (unlikely(!idescs))
656 nr_descs = desc->len / sizeof(struct vring_packed_desc);
657 if (unlikely(nr_descs >= vq->size)) {
658 free_ind_table(idescs);
662 for (i = 0; i < nr_descs; i++) {
663 if (unlikely(vec_id >= BUF_VECTOR_MAX)) {
664 free_ind_table(idescs);
668 *len += descs[i].len;
669 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
670 descs[i].addr, descs[i].len,
676 if (unlikely(!!idescs))
677 free_ind_table(idescs);
682 static __rte_always_inline int
683 fill_vec_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
684 uint16_t avail_idx, uint16_t *desc_count,
685 struct buf_vector *buf_vec, uint16_t *vec_idx,
686 uint16_t *buf_id, uint32_t *len, uint8_t perm)
688 bool wrap_counter = vq->avail_wrap_counter;
689 struct vring_packed_desc *descs = vq->desc_packed;
690 uint16_t vec_id = *vec_idx;
692 if (avail_idx < vq->last_avail_idx)
696 * Perform a load-acquire barrier in desc_is_avail to
697 * enforce the ordering between desc flags and desc
700 if (unlikely(!desc_is_avail(&descs[avail_idx], wrap_counter)))
707 if (unlikely(vec_id >= BUF_VECTOR_MAX))
710 if (unlikely(*desc_count >= vq->size))
714 *buf_id = descs[avail_idx].id;
716 if (descs[avail_idx].flags & VRING_DESC_F_INDIRECT) {
717 if (unlikely(fill_vec_buf_packed_indirect(dev, vq,
723 *len += descs[avail_idx].len;
725 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
726 descs[avail_idx].addr,
727 descs[avail_idx].len,
732 if ((descs[avail_idx].flags & VRING_DESC_F_NEXT) == 0)
735 if (++avail_idx >= vq->size) {
736 avail_idx -= vq->size;
746 static __rte_noinline void
747 copy_vnet_hdr_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
748 struct buf_vector *buf_vec,
749 struct virtio_net_hdr_mrg_rxbuf *hdr)
752 uint64_t remain = dev->vhost_hlen;
753 uint64_t src = (uint64_t)(uintptr_t)hdr, dst;
754 uint64_t iova = buf_vec->buf_iova;
757 len = RTE_MIN(remain,
759 dst = buf_vec->buf_addr;
760 rte_memcpy((void *)(uintptr_t)dst,
761 (void *)(uintptr_t)src,
764 PRINT_PACKET(dev, (uintptr_t)dst,
766 vhost_log_cache_write_iova(dev, vq,
776 static __rte_always_inline int
777 copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
778 struct rte_mbuf *m, struct buf_vector *buf_vec,
779 uint16_t nr_vec, uint16_t num_buffers)
781 uint32_t vec_idx = 0;
782 uint32_t mbuf_offset, mbuf_avail;
783 uint32_t buf_offset, buf_avail;
784 uint64_t buf_addr, buf_iova, buf_len;
787 struct rte_mbuf *hdr_mbuf;
788 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
789 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
792 if (unlikely(m == NULL)) {
797 buf_addr = buf_vec[vec_idx].buf_addr;
798 buf_iova = buf_vec[vec_idx].buf_iova;
799 buf_len = buf_vec[vec_idx].buf_len;
801 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
808 if (unlikely(buf_len < dev->vhost_hlen))
811 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
813 VHOST_LOG_DATA(DEBUG, "(%d) RX: num merge buffers %d\n",
814 dev->vid, num_buffers);
816 if (unlikely(buf_len < dev->vhost_hlen)) {
817 buf_offset = dev->vhost_hlen - buf_len;
819 buf_addr = buf_vec[vec_idx].buf_addr;
820 buf_iova = buf_vec[vec_idx].buf_iova;
821 buf_len = buf_vec[vec_idx].buf_len;
822 buf_avail = buf_len - buf_offset;
824 buf_offset = dev->vhost_hlen;
825 buf_avail = buf_len - dev->vhost_hlen;
828 mbuf_avail = rte_pktmbuf_data_len(m);
830 while (mbuf_avail != 0 || m->next != NULL) {
831 /* done with current buf, get the next one */
832 if (buf_avail == 0) {
834 if (unlikely(vec_idx >= nr_vec)) {
839 buf_addr = buf_vec[vec_idx].buf_addr;
840 buf_iova = buf_vec[vec_idx].buf_iova;
841 buf_len = buf_vec[vec_idx].buf_len;
847 /* done with current mbuf, get the next one */
848 if (mbuf_avail == 0) {
852 mbuf_avail = rte_pktmbuf_data_len(m);
856 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
857 if (rxvq_is_mergeable(dev))
858 ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
861 if (unlikely(hdr == &tmp_hdr)) {
862 copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
864 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
866 vhost_log_cache_write_iova(dev, vq,
874 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
876 if (likely(cpy_len > MAX_BATCH_LEN ||
877 vq->batch_copy_nb_elems >= vq->size)) {
878 rte_memcpy((void *)((uintptr_t)(buf_addr + buf_offset)),
879 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
881 vhost_log_cache_write_iova(dev, vq,
882 buf_iova + buf_offset,
884 PRINT_PACKET(dev, (uintptr_t)(buf_addr + buf_offset),
887 batch_copy[vq->batch_copy_nb_elems].dst =
888 (void *)((uintptr_t)(buf_addr + buf_offset));
889 batch_copy[vq->batch_copy_nb_elems].src =
890 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
891 batch_copy[vq->batch_copy_nb_elems].log_addr =
892 buf_iova + buf_offset;
893 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
894 vq->batch_copy_nb_elems++;
897 mbuf_avail -= cpy_len;
898 mbuf_offset += cpy_len;
899 buf_avail -= cpy_len;
900 buf_offset += cpy_len;
908 static __rte_always_inline int
909 vhost_enqueue_single_packed(struct virtio_net *dev,
910 struct vhost_virtqueue *vq,
911 struct rte_mbuf *pkt,
912 struct buf_vector *buf_vec,
916 uint16_t avail_idx = vq->last_avail_idx;
917 uint16_t max_tries, tries = 0;
921 uint32_t size = pkt->pkt_len + dev->vhost_hlen;
922 uint16_t num_buffers = 0;
923 uint32_t buffer_len[vq->size];
924 uint16_t buffer_buf_id[vq->size];
925 uint16_t buffer_desc_count[vq->size];
927 if (rxvq_is_mergeable(dev))
928 max_tries = vq->size - 1;
934 * if we tried all available ring items, and still
935 * can't get enough buf, it means something abnormal
938 if (unlikely(++tries > max_tries))
941 if (unlikely(fill_vec_buf_packed(dev, vq,
942 avail_idx, &desc_count,
945 VHOST_ACCESS_RW) < 0))
948 len = RTE_MIN(len, size);
951 buffer_len[num_buffers] = len;
952 buffer_buf_id[num_buffers] = buf_id;
953 buffer_desc_count[num_buffers] = desc_count;
956 *nr_descs += desc_count;
957 avail_idx += desc_count;
958 if (avail_idx >= vq->size)
959 avail_idx -= vq->size;
962 if (copy_mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, num_buffers) < 0)
965 vhost_shadow_enqueue_single_packed(dev, vq, buffer_len, buffer_buf_id,
966 buffer_desc_count, num_buffers);
971 static __rte_noinline uint32_t
972 virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
973 struct rte_mbuf **pkts, uint32_t count)
975 uint32_t pkt_idx = 0;
976 uint16_t num_buffers;
977 struct buf_vector buf_vec[BUF_VECTOR_MAX];
981 * The ordering between avail index and
982 * desc reads needs to be enforced.
984 avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
986 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
988 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
989 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
992 if (unlikely(reserve_avail_buf_split(dev, vq,
993 pkt_len, buf_vec, &num_buffers,
994 avail_head, &nr_vec) < 0)) {
995 VHOST_LOG_DATA(DEBUG,
996 "(%d) failed to get enough desc from vring\n",
998 vq->shadow_used_idx -= num_buffers;
1002 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1003 dev->vid, vq->last_avail_idx,
1004 vq->last_avail_idx + num_buffers);
1006 if (copy_mbuf_to_desc(dev, vq, pkts[pkt_idx],
1009 vq->shadow_used_idx -= num_buffers;
1013 vq->last_avail_idx += num_buffers;
1016 do_data_copy_enqueue(dev, vq);
1018 if (likely(vq->shadow_used_idx)) {
1019 flush_shadow_used_ring_split(dev, vq);
1020 vhost_vring_call_split(dev, vq);
1026 static __rte_always_inline int
1027 virtio_dev_rx_batch_packed(struct virtio_net *dev,
1028 struct vhost_virtqueue *vq,
1029 struct rte_mbuf **pkts)
1031 bool wrap_counter = vq->avail_wrap_counter;
1032 struct vring_packed_desc *descs = vq->desc_packed;
1033 uint16_t avail_idx = vq->last_avail_idx;
1034 uint64_t desc_addrs[PACKED_BATCH_SIZE];
1035 struct virtio_net_hdr_mrg_rxbuf *hdrs[PACKED_BATCH_SIZE];
1036 uint32_t buf_offset = dev->vhost_hlen;
1037 uint64_t lens[PACKED_BATCH_SIZE];
1038 uint16_t ids[PACKED_BATCH_SIZE];
1041 if (unlikely(avail_idx & PACKED_BATCH_MASK))
1044 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
1047 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1048 if (unlikely(pkts[i]->next != NULL))
1050 if (unlikely(!desc_is_avail(&descs[avail_idx + i],
1057 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1058 lens[i] = descs[avail_idx + i].len;
1060 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1061 if (unlikely(pkts[i]->pkt_len > (lens[i] - buf_offset)))
1065 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1066 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
1067 descs[avail_idx + i].addr,
1071 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1072 if (unlikely(lens[i] != descs[avail_idx + i].len))
1076 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1077 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
1078 hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)
1079 (uintptr_t)desc_addrs[i];
1080 lens[i] = pkts[i]->pkt_len + dev->vhost_hlen;
1083 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1084 virtio_enqueue_offload(pkts[i], &hdrs[i]->hdr);
1086 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
1088 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1089 rte_memcpy((void *)(uintptr_t)(desc_addrs[i] + buf_offset),
1090 rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
1094 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1095 vhost_log_cache_write_iova(dev, vq, descs[avail_idx + i].addr,
1098 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1099 ids[i] = descs[avail_idx + i].id;
1101 vhost_flush_enqueue_batch_packed(dev, vq, lens, ids);
1106 static __rte_always_inline int16_t
1107 virtio_dev_rx_single_packed(struct virtio_net *dev,
1108 struct vhost_virtqueue *vq,
1109 struct rte_mbuf *pkt)
1111 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1112 uint16_t nr_descs = 0;
1115 if (unlikely(vhost_enqueue_single_packed(dev, vq, pkt, buf_vec,
1117 VHOST_LOG_DATA(DEBUG,
1118 "(%d) failed to get enough desc from vring\n",
1123 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1124 dev->vid, vq->last_avail_idx,
1125 vq->last_avail_idx + nr_descs);
1127 vq_inc_last_avail_packed(vq, nr_descs);
1132 static __rte_noinline uint32_t
1133 virtio_dev_rx_packed(struct virtio_net *dev,
1134 struct vhost_virtqueue *vq,
1135 struct rte_mbuf **pkts,
1138 uint32_t pkt_idx = 0;
1139 uint32_t remained = count;
1142 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
1144 if (remained >= PACKED_BATCH_SIZE) {
1145 if (!virtio_dev_rx_batch_packed(dev, vq,
1147 pkt_idx += PACKED_BATCH_SIZE;
1148 remained -= PACKED_BATCH_SIZE;
1153 if (virtio_dev_rx_single_packed(dev, vq, pkts[pkt_idx]))
1158 } while (pkt_idx < count);
1160 if (vq->shadow_used_idx) {
1161 do_data_copy_enqueue(dev, vq);
1162 vhost_flush_enqueue_shadow_packed(dev, vq);
1166 vhost_vring_call_packed(dev, vq);
1171 static __rte_always_inline uint32_t
1172 virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
1173 struct rte_mbuf **pkts, uint32_t count)
1175 struct vhost_virtqueue *vq;
1178 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1179 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1180 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1181 dev->vid, __func__, queue_id);
1185 vq = dev->virtqueue[queue_id];
1187 rte_spinlock_lock(&vq->access_lock);
1189 if (unlikely(vq->enabled == 0))
1190 goto out_access_unlock;
1192 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1193 vhost_user_iotlb_rd_lock(vq);
1195 if (unlikely(vq->access_ok == 0))
1196 if (unlikely(vring_translate(dev, vq) < 0))
1199 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
1203 if (vq_is_packed(dev))
1204 nb_tx = virtio_dev_rx_packed(dev, vq, pkts, count);
1206 nb_tx = virtio_dev_rx_split(dev, vq, pkts, count);
1209 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1210 vhost_user_iotlb_rd_unlock(vq);
1213 rte_spinlock_unlock(&vq->access_lock);
1219 rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
1220 struct rte_mbuf **pkts, uint16_t count)
1222 struct virtio_net *dev = get_device(vid);
1227 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
1229 "(%d) %s: built-in vhost net backend is disabled.\n",
1230 dev->vid, __func__);
1234 return virtio_dev_rx(dev, queue_id, pkts, count);
1238 virtio_net_with_host_offload(struct virtio_net *dev)
1241 ((1ULL << VIRTIO_NET_F_CSUM) |
1242 (1ULL << VIRTIO_NET_F_HOST_ECN) |
1243 (1ULL << VIRTIO_NET_F_HOST_TSO4) |
1244 (1ULL << VIRTIO_NET_F_HOST_TSO6) |
1245 (1ULL << VIRTIO_NET_F_HOST_UFO)))
1252 parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
1254 struct rte_ipv4_hdr *ipv4_hdr;
1255 struct rte_ipv6_hdr *ipv6_hdr;
1256 void *l3_hdr = NULL;
1257 struct rte_ether_hdr *eth_hdr;
1260 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
1262 m->l2_len = sizeof(struct rte_ether_hdr);
1263 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
1265 if (ethertype == RTE_ETHER_TYPE_VLAN) {
1266 struct rte_vlan_hdr *vlan_hdr =
1267 (struct rte_vlan_hdr *)(eth_hdr + 1);
1269 m->l2_len += sizeof(struct rte_vlan_hdr);
1270 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
1273 l3_hdr = (char *)eth_hdr + m->l2_len;
1275 switch (ethertype) {
1276 case RTE_ETHER_TYPE_IPV4:
1278 *l4_proto = ipv4_hdr->next_proto_id;
1279 m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
1280 *l4_hdr = (char *)l3_hdr + m->l3_len;
1281 m->ol_flags |= PKT_TX_IPV4;
1283 case RTE_ETHER_TYPE_IPV6:
1285 *l4_proto = ipv6_hdr->proto;
1286 m->l3_len = sizeof(struct rte_ipv6_hdr);
1287 *l4_hdr = (char *)l3_hdr + m->l3_len;
1288 m->ol_flags |= PKT_TX_IPV6;
1298 static __rte_always_inline void
1299 vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
1301 uint16_t l4_proto = 0;
1302 void *l4_hdr = NULL;
1303 struct rte_tcp_hdr *tcp_hdr = NULL;
1305 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1308 parse_ethernet(m, &l4_proto, &l4_hdr);
1309 if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1310 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
1311 switch (hdr->csum_offset) {
1312 case (offsetof(struct rte_tcp_hdr, cksum)):
1313 if (l4_proto == IPPROTO_TCP)
1314 m->ol_flags |= PKT_TX_TCP_CKSUM;
1316 case (offsetof(struct rte_udp_hdr, dgram_cksum)):
1317 if (l4_proto == IPPROTO_UDP)
1318 m->ol_flags |= PKT_TX_UDP_CKSUM;
1320 case (offsetof(struct rte_sctp_hdr, cksum)):
1321 if (l4_proto == IPPROTO_SCTP)
1322 m->ol_flags |= PKT_TX_SCTP_CKSUM;
1330 if (l4_hdr && hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1331 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1332 case VIRTIO_NET_HDR_GSO_TCPV4:
1333 case VIRTIO_NET_HDR_GSO_TCPV6:
1335 m->ol_flags |= PKT_TX_TCP_SEG;
1336 m->tso_segsz = hdr->gso_size;
1337 m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
1339 case VIRTIO_NET_HDR_GSO_UDP:
1340 m->ol_flags |= PKT_TX_UDP_SEG;
1341 m->tso_segsz = hdr->gso_size;
1342 m->l4_len = sizeof(struct rte_udp_hdr);
1345 VHOST_LOG_DATA(WARNING,
1346 "unsupported gso type %u.\n", hdr->gso_type);
1352 static __rte_noinline void
1353 copy_vnet_hdr_from_desc(struct virtio_net_hdr *hdr,
1354 struct buf_vector *buf_vec)
1357 uint64_t remain = sizeof(struct virtio_net_hdr);
1359 uint64_t dst = (uint64_t)(uintptr_t)hdr;
1362 len = RTE_MIN(remain, buf_vec->buf_len);
1363 src = buf_vec->buf_addr;
1364 rte_memcpy((void *)(uintptr_t)dst,
1365 (void *)(uintptr_t)src, len);
1373 static __rte_always_inline int
1374 copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
1375 struct buf_vector *buf_vec, uint16_t nr_vec,
1376 struct rte_mbuf *m, struct rte_mempool *mbuf_pool)
1378 uint32_t buf_avail, buf_offset;
1379 uint64_t buf_addr, buf_iova, buf_len;
1380 uint32_t mbuf_avail, mbuf_offset;
1382 struct rte_mbuf *cur = m, *prev = m;
1383 struct virtio_net_hdr tmp_hdr;
1384 struct virtio_net_hdr *hdr = NULL;
1385 /* A counter to avoid desc dead loop chain */
1386 uint16_t vec_idx = 0;
1387 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
1390 buf_addr = buf_vec[vec_idx].buf_addr;
1391 buf_iova = buf_vec[vec_idx].buf_iova;
1392 buf_len = buf_vec[vec_idx].buf_len;
1394 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
1399 if (virtio_net_with_host_offload(dev)) {
1400 if (unlikely(buf_len < sizeof(struct virtio_net_hdr))) {
1402 * No luck, the virtio-net header doesn't fit
1403 * in a contiguous virtual area.
1405 copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec);
1408 hdr = (struct virtio_net_hdr *)((uintptr_t)buf_addr);
1413 * A virtio driver normally uses at least 2 desc buffers
1414 * for Tx: the first for storing the header, and others
1415 * for storing the data.
1417 if (unlikely(buf_len < dev->vhost_hlen)) {
1418 buf_offset = dev->vhost_hlen - buf_len;
1420 buf_addr = buf_vec[vec_idx].buf_addr;
1421 buf_iova = buf_vec[vec_idx].buf_iova;
1422 buf_len = buf_vec[vec_idx].buf_len;
1423 buf_avail = buf_len - buf_offset;
1424 } else if (buf_len == dev->vhost_hlen) {
1425 if (unlikely(++vec_idx >= nr_vec))
1427 buf_addr = buf_vec[vec_idx].buf_addr;
1428 buf_iova = buf_vec[vec_idx].buf_iova;
1429 buf_len = buf_vec[vec_idx].buf_len;
1432 buf_avail = buf_len;
1434 buf_offset = dev->vhost_hlen;
1435 buf_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
1439 (uintptr_t)(buf_addr + buf_offset),
1440 (uint32_t)buf_avail, 0);
1443 mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
1447 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
1450 * A desc buf might across two host physical pages that are
1451 * not continuous. In such case (gpa_to_hpa returns 0), data
1452 * will be copied even though zero copy is enabled.
1454 if (unlikely(dev->dequeue_zero_copy && (hpa = gpa_to_hpa(dev,
1455 buf_iova + buf_offset, cpy_len)))) {
1456 cur->data_len = cpy_len;
1459 (void *)(uintptr_t)(buf_addr + buf_offset);
1460 cur->buf_iova = hpa;
1463 * In zero copy mode, one mbuf can only reference data
1464 * for one or partial of one desc buff.
1466 mbuf_avail = cpy_len;
1468 if (likely(cpy_len > MAX_BATCH_LEN ||
1469 vq->batch_copy_nb_elems >= vq->size ||
1470 (hdr && cur == m))) {
1471 rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
1473 (void *)((uintptr_t)(buf_addr +
1477 batch_copy[vq->batch_copy_nb_elems].dst =
1478 rte_pktmbuf_mtod_offset(cur, void *,
1480 batch_copy[vq->batch_copy_nb_elems].src =
1481 (void *)((uintptr_t)(buf_addr +
1483 batch_copy[vq->batch_copy_nb_elems].len =
1485 vq->batch_copy_nb_elems++;
1489 mbuf_avail -= cpy_len;
1490 mbuf_offset += cpy_len;
1491 buf_avail -= cpy_len;
1492 buf_offset += cpy_len;
1494 /* This buf reaches to its end, get the next one */
1495 if (buf_avail == 0) {
1496 if (++vec_idx >= nr_vec)
1499 buf_addr = buf_vec[vec_idx].buf_addr;
1500 buf_iova = buf_vec[vec_idx].buf_iova;
1501 buf_len = buf_vec[vec_idx].buf_len;
1504 buf_avail = buf_len;
1506 PRINT_PACKET(dev, (uintptr_t)buf_addr,
1507 (uint32_t)buf_avail, 0);
1511 * This mbuf reaches to its end, get a new one
1512 * to hold more data.
1514 if (mbuf_avail == 0) {
1515 cur = rte_pktmbuf_alloc(mbuf_pool);
1516 if (unlikely(cur == NULL)) {
1517 VHOST_LOG_DATA(ERR, "Failed to "
1518 "allocate memory for mbuf.\n");
1522 if (unlikely(dev->dequeue_zero_copy))
1523 rte_mbuf_refcnt_update(cur, 1);
1526 prev->data_len = mbuf_offset;
1528 m->pkt_len += mbuf_offset;
1532 mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
1536 prev->data_len = mbuf_offset;
1537 m->pkt_len += mbuf_offset;
1540 vhost_dequeue_offload(hdr, m);
1547 static __rte_always_inline struct zcopy_mbuf *
1548 get_zmbuf(struct vhost_virtqueue *vq)
1554 /* search [last_zmbuf_idx, zmbuf_size) */
1555 i = vq->last_zmbuf_idx;
1556 last = vq->zmbuf_size;
1559 for (; i < last; i++) {
1560 if (vq->zmbufs[i].in_use == 0) {
1561 vq->last_zmbuf_idx = i + 1;
1562 vq->zmbufs[i].in_use = 1;
1563 return &vq->zmbufs[i];
1569 /* search [0, last_zmbuf_idx) */
1571 last = vq->last_zmbuf_idx;
1579 virtio_dev_extbuf_free(void *addr __rte_unused, void *opaque)
1585 virtio_dev_extbuf_alloc(struct rte_mbuf *pkt, uint32_t size)
1587 struct rte_mbuf_ext_shared_info *shinfo = NULL;
1588 uint32_t total_len = RTE_PKTMBUF_HEADROOM + size;
1593 /* Try to use pkt buffer to store shinfo to reduce the amount of memory
1594 * required, otherwise store shinfo in the new buffer.
1596 if (rte_pktmbuf_tailroom(pkt) >= sizeof(*shinfo))
1597 shinfo = rte_pktmbuf_mtod(pkt,
1598 struct rte_mbuf_ext_shared_info *);
1600 total_len += sizeof(*shinfo) + sizeof(uintptr_t);
1601 total_len = RTE_ALIGN_CEIL(total_len, sizeof(uintptr_t));
1604 if (unlikely(total_len > UINT16_MAX))
1607 buf_len = total_len;
1608 buf = rte_malloc(NULL, buf_len, RTE_CACHE_LINE_SIZE);
1609 if (unlikely(buf == NULL))
1612 /* Initialize shinfo */
1614 shinfo->free_cb = virtio_dev_extbuf_free;
1615 shinfo->fcb_opaque = buf;
1616 rte_mbuf_ext_refcnt_set(shinfo, 1);
1618 shinfo = rte_pktmbuf_ext_shinfo_init_helper(buf, &buf_len,
1619 virtio_dev_extbuf_free, buf);
1620 if (unlikely(shinfo == NULL)) {
1622 VHOST_LOG_DATA(ERR, "Failed to init shinfo\n");
1627 iova = rte_malloc_virt2iova(buf);
1628 rte_pktmbuf_attach_extbuf(pkt, buf, iova, buf_len, shinfo);
1629 rte_pktmbuf_reset_headroom(pkt);
1635 * Allocate a host supported pktmbuf.
1637 static __rte_always_inline struct rte_mbuf *
1638 virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
1641 struct rte_mbuf *pkt = rte_pktmbuf_alloc(mp);
1643 if (unlikely(pkt == NULL)) {
1645 "Failed to allocate memory for mbuf.\n");
1649 if (rte_pktmbuf_tailroom(pkt) >= data_len)
1652 /* attach an external buffer if supported */
1653 if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
1656 /* check if chained buffers are allowed */
1657 if (!dev->linearbuf)
1660 /* Data doesn't fit into the buffer and the host supports
1661 * only linear buffers
1663 rte_pktmbuf_free(pkt);
1668 static __rte_noinline uint16_t
1669 virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
1670 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
1673 uint16_t free_entries;
1675 if (unlikely(dev->dequeue_zero_copy)) {
1676 struct zcopy_mbuf *zmbuf, *next;
1678 for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
1679 zmbuf != NULL; zmbuf = next) {
1680 next = TAILQ_NEXT(zmbuf, next);
1682 if (mbuf_is_consumed(zmbuf->mbuf)) {
1683 update_shadow_used_ring_split(vq,
1684 zmbuf->desc_idx, 0);
1685 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
1686 restore_mbuf(zmbuf->mbuf);
1687 rte_pktmbuf_free(zmbuf->mbuf);
1693 if (likely(vq->shadow_used_idx)) {
1694 flush_shadow_used_ring_split(dev, vq);
1695 vhost_vring_call_split(dev, vq);
1700 * The ordering between avail index and
1701 * desc reads needs to be enforced.
1703 free_entries = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE) -
1705 if (free_entries == 0)
1708 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1710 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1712 count = RTE_MIN(count, MAX_PKT_BURST);
1713 count = RTE_MIN(count, free_entries);
1714 VHOST_LOG_DATA(DEBUG, "(%d) about to dequeue %u buffers\n",
1717 for (i = 0; i < count; i++) {
1718 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1721 uint16_t nr_vec = 0;
1724 if (unlikely(fill_vec_buf_split(dev, vq,
1725 vq->last_avail_idx + i,
1727 &head_idx, &buf_len,
1728 VHOST_ACCESS_RO) < 0))
1731 if (likely(dev->dequeue_zero_copy == 0))
1732 update_shadow_used_ring_split(vq, head_idx, 0);
1734 pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
1735 if (unlikely(pkts[i] == NULL))
1738 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts[i],
1740 if (unlikely(err)) {
1741 rte_pktmbuf_free(pkts[i]);
1745 if (unlikely(dev->dequeue_zero_copy)) {
1746 struct zcopy_mbuf *zmbuf;
1748 zmbuf = get_zmbuf(vq);
1750 rte_pktmbuf_free(pkts[i]);
1753 zmbuf->mbuf = pkts[i];
1754 zmbuf->desc_idx = head_idx;
1757 * Pin lock the mbuf; we will check later to see
1758 * whether the mbuf is freed (when we are the last
1759 * user) or not. If that's the case, we then could
1760 * update the used ring safely.
1762 rte_mbuf_refcnt_update(pkts[i], 1);
1765 TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next);
1768 vq->last_avail_idx += i;
1770 if (likely(dev->dequeue_zero_copy == 0)) {
1771 do_data_copy_dequeue(vq);
1772 if (unlikely(i < count))
1773 vq->shadow_used_idx = i;
1774 if (likely(vq->shadow_used_idx)) {
1775 flush_shadow_used_ring_split(dev, vq);
1776 vhost_vring_call_split(dev, vq);
1783 static __rte_always_inline int
1784 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
1785 struct vhost_virtqueue *vq,
1786 struct rte_mempool *mbuf_pool,
1787 struct rte_mbuf **pkts,
1789 uintptr_t *desc_addrs,
1792 bool wrap = vq->avail_wrap_counter;
1793 struct vring_packed_desc *descs = vq->desc_packed;
1794 struct virtio_net_hdr *hdr;
1795 uint64_t lens[PACKED_BATCH_SIZE];
1796 uint64_t buf_lens[PACKED_BATCH_SIZE];
1797 uint32_t buf_offset = dev->vhost_hlen;
1800 if (unlikely(avail_idx & PACKED_BATCH_MASK))
1802 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
1805 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1806 flags = descs[avail_idx + i].flags;
1807 if (unlikely((wrap != !!(flags & VRING_DESC_F_AVAIL)) ||
1808 (wrap == !!(flags & VRING_DESC_F_USED)) ||
1809 (flags & PACKED_DESC_SINGLE_DEQUEUE_FLAG)))
1815 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1816 lens[i] = descs[avail_idx + i].len;
1818 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1819 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
1820 descs[avail_idx + i].addr,
1821 &lens[i], VHOST_ACCESS_RW);
1824 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1825 if (unlikely((lens[i] != descs[avail_idx + i].len)))
1829 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1830 pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
1835 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1836 buf_lens[i] = pkts[i]->buf_len - pkts[i]->data_off;
1838 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1839 if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
1843 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1844 pkts[i]->pkt_len = descs[avail_idx + i].len - buf_offset;
1845 pkts[i]->data_len = pkts[i]->pkt_len;
1846 ids[i] = descs[avail_idx + i].id;
1849 if (virtio_net_with_host_offload(dev)) {
1850 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1851 hdr = (struct virtio_net_hdr *)(desc_addrs[i]);
1852 vhost_dequeue_offload(hdr, pkts[i]);
1859 for (i = 0; i < PACKED_BATCH_SIZE; i++)
1860 rte_pktmbuf_free(pkts[i]);
1865 static __rte_always_inline int
1866 virtio_dev_tx_batch_packed(struct virtio_net *dev,
1867 struct vhost_virtqueue *vq,
1868 struct rte_mempool *mbuf_pool,
1869 struct rte_mbuf **pkts)
1871 uint16_t avail_idx = vq->last_avail_idx;
1872 uint32_t buf_offset = dev->vhost_hlen;
1873 uintptr_t desc_addrs[PACKED_BATCH_SIZE];
1874 uint16_t ids[PACKED_BATCH_SIZE];
1877 if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
1878 avail_idx, desc_addrs, ids))
1881 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1882 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
1884 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1885 rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
1886 (void *)(uintptr_t)(desc_addrs[i] + buf_offset),
1889 if (virtio_net_is_inorder(dev))
1890 vhost_shadow_dequeue_batch_packed_inorder(vq,
1891 ids[PACKED_BATCH_SIZE - 1]);
1893 vhost_shadow_dequeue_batch_packed(dev, vq, ids);
1895 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
1900 static __rte_always_inline int
1901 vhost_dequeue_single_packed(struct virtio_net *dev,
1902 struct vhost_virtqueue *vq,
1903 struct rte_mempool *mbuf_pool,
1904 struct rte_mbuf **pkts,
1906 uint16_t *desc_count)
1908 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1910 uint16_t nr_vec = 0;
1913 if (unlikely(fill_vec_buf_packed(dev, vq,
1914 vq->last_avail_idx, desc_count,
1917 VHOST_ACCESS_RO) < 0))
1920 *pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
1921 if (unlikely(*pkts == NULL)) {
1923 "Failed to allocate memory for mbuf.\n");
1927 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
1929 if (unlikely(err)) {
1930 rte_pktmbuf_free(*pkts);
1937 static __rte_always_inline int
1938 virtio_dev_tx_single_packed(struct virtio_net *dev,
1939 struct vhost_virtqueue *vq,
1940 struct rte_mempool *mbuf_pool,
1941 struct rte_mbuf **pkts)
1944 uint16_t buf_id, desc_count;
1946 if (vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id,
1950 if (virtio_net_is_inorder(dev))
1951 vhost_shadow_dequeue_single_packed_inorder(vq, buf_id,
1954 vhost_shadow_dequeue_single_packed(vq, buf_id, desc_count);
1956 vq_inc_last_avail_packed(vq, desc_count);
1961 static __rte_always_inline int
1962 virtio_dev_tx_batch_packed_zmbuf(struct virtio_net *dev,
1963 struct vhost_virtqueue *vq,
1964 struct rte_mempool *mbuf_pool,
1965 struct rte_mbuf **pkts)
1967 struct zcopy_mbuf *zmbufs[PACKED_BATCH_SIZE];
1968 uintptr_t desc_addrs[PACKED_BATCH_SIZE];
1969 uint16_t ids[PACKED_BATCH_SIZE];
1972 uint16_t avail_idx = vq->last_avail_idx;
1974 if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
1975 avail_idx, desc_addrs, ids))
1978 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1979 zmbufs[i] = get_zmbuf(vq);
1981 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1986 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1987 zmbufs[i]->mbuf = pkts[i];
1988 zmbufs[i]->desc_idx = ids[i];
1989 zmbufs[i]->desc_count = 1;
1992 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1993 rte_mbuf_refcnt_update(pkts[i], 1);
1995 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1996 TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbufs[i], next);
1998 vq->nr_zmbuf += PACKED_BATCH_SIZE;
1999 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
2004 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2005 rte_pktmbuf_free(pkts[i]);
2010 static __rte_always_inline int
2011 virtio_dev_tx_single_packed_zmbuf(struct virtio_net *dev,
2012 struct vhost_virtqueue *vq,
2013 struct rte_mempool *mbuf_pool,
2014 struct rte_mbuf **pkts)
2016 uint16_t buf_id, desc_count;
2017 struct zcopy_mbuf *zmbuf;
2019 if (vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id,
2023 zmbuf = get_zmbuf(vq);
2025 rte_pktmbuf_free(*pkts);
2028 zmbuf->mbuf = *pkts;
2029 zmbuf->desc_idx = buf_id;
2030 zmbuf->desc_count = desc_count;
2032 rte_mbuf_refcnt_update(*pkts, 1);
2035 TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next);
2037 vq_inc_last_avail_packed(vq, desc_count);
2041 static __rte_always_inline void
2042 free_zmbuf(struct vhost_virtqueue *vq)
2044 struct zcopy_mbuf *next = NULL;
2045 struct zcopy_mbuf *zmbuf;
2047 for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
2048 zmbuf != NULL; zmbuf = next) {
2049 next = TAILQ_NEXT(zmbuf, next);
2051 uint16_t last_used_idx = vq->last_used_idx;
2053 if (mbuf_is_consumed(zmbuf->mbuf)) {
2055 flags = vq->desc_packed[last_used_idx].flags;
2056 if (vq->used_wrap_counter) {
2057 flags |= VRING_DESC_F_USED;
2058 flags |= VRING_DESC_F_AVAIL;
2060 flags &= ~VRING_DESC_F_USED;
2061 flags &= ~VRING_DESC_F_AVAIL;
2064 vq->desc_packed[last_used_idx].id = zmbuf->desc_idx;
2065 vq->desc_packed[last_used_idx].len = 0;
2068 vq->desc_packed[last_used_idx].flags = flags;
2070 vq_inc_last_used_packed(vq, zmbuf->desc_count);
2072 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
2073 restore_mbuf(zmbuf->mbuf);
2074 rte_pktmbuf_free(zmbuf->mbuf);
2081 static __rte_noinline uint16_t
2082 virtio_dev_tx_packed_zmbuf(struct virtio_net *dev,
2083 struct vhost_virtqueue *vq,
2084 struct rte_mempool *mbuf_pool,
2085 struct rte_mbuf **pkts,
2088 uint32_t pkt_idx = 0;
2089 uint32_t remained = count;
2094 if (remained >= PACKED_BATCH_SIZE) {
2095 if (!virtio_dev_tx_batch_packed_zmbuf(dev, vq,
2096 mbuf_pool, &pkts[pkt_idx])) {
2097 pkt_idx += PACKED_BATCH_SIZE;
2098 remained -= PACKED_BATCH_SIZE;
2103 if (virtio_dev_tx_single_packed_zmbuf(dev, vq, mbuf_pool,
2112 vhost_vring_call_packed(dev, vq);
2117 static __rte_noinline uint16_t
2118 virtio_dev_tx_packed(struct virtio_net *dev,
2119 struct vhost_virtqueue *vq,
2120 struct rte_mempool *mbuf_pool,
2121 struct rte_mbuf **pkts,
2124 uint32_t pkt_idx = 0;
2125 uint32_t remained = count;
2128 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
2130 if (remained >= PACKED_BATCH_SIZE) {
2131 if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
2133 pkt_idx += PACKED_BATCH_SIZE;
2134 remained -= PACKED_BATCH_SIZE;
2139 if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
2147 if (vq->shadow_used_idx) {
2148 do_data_copy_dequeue(vq);
2150 vhost_flush_dequeue_shadow_packed(dev, vq);
2151 vhost_vring_call_packed(dev, vq);
2158 rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
2159 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
2161 struct virtio_net *dev;
2162 struct rte_mbuf *rarp_mbuf = NULL;
2163 struct vhost_virtqueue *vq;
2164 int16_t success = 1;
2166 dev = get_device(vid);
2170 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
2172 "(%d) %s: built-in vhost net backend is disabled.\n",
2173 dev->vid, __func__);
2177 if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
2179 "(%d) %s: invalid virtqueue idx %d.\n",
2180 dev->vid, __func__, queue_id);
2184 vq = dev->virtqueue[queue_id];
2186 if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0))
2189 if (unlikely(vq->enabled == 0)) {
2191 goto out_access_unlock;
2194 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2195 vhost_user_iotlb_rd_lock(vq);
2197 if (unlikely(vq->access_ok == 0))
2198 if (unlikely(vring_translate(dev, vq) < 0)) {
2204 * Construct a RARP broadcast packet, and inject it to the "pkts"
2205 * array, to looks like that guest actually send such packet.
2207 * Check user_send_rarp() for more information.
2209 * broadcast_rarp shares a cacheline in the virtio_net structure
2210 * with some fields that are accessed during enqueue and
2211 * __atomic_compare_exchange_n causes a write if performed compare
2212 * and exchange. This could result in false sharing between enqueue
2215 * Prevent unnecessary false sharing by reading broadcast_rarp first
2216 * and only performing compare and exchange if the read indicates it
2217 * is likely to be set.
2219 if (unlikely(__atomic_load_n(&dev->broadcast_rarp, __ATOMIC_ACQUIRE) &&
2220 __atomic_compare_exchange_n(&dev->broadcast_rarp,
2221 &success, 0, 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED))) {
2223 rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac);
2224 if (rarp_mbuf == NULL) {
2225 VHOST_LOG_DATA(ERR, "Failed to make RARP packet.\n");
2232 if (vq_is_packed(dev)) {
2233 if (unlikely(dev->dequeue_zero_copy))
2234 count = virtio_dev_tx_packed_zmbuf(dev, vq, mbuf_pool,
2237 count = virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts,
2240 count = virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count);
2243 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2244 vhost_user_iotlb_rd_unlock(vq);
2247 rte_spinlock_unlock(&vq->access_lock);
2249 if (unlikely(rarp_mbuf != NULL)) {
2251 * Inject it to the head of "pkts" array, so that switch's mac
2252 * learning table will get updated first.
2254 memmove(&pkts[1], pkts, count * sizeof(struct rte_mbuf *));
2255 pkts[0] = rarp_mbuf;