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);
35 is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
37 return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
40 static __rte_always_inline void
41 do_flush_shadow_used_ring_split(struct virtio_net *dev,
42 struct vhost_virtqueue *vq,
43 uint16_t to, uint16_t from, uint16_t size)
45 rte_memcpy(&vq->used->ring[to],
46 &vq->shadow_used_split[from],
47 size * sizeof(struct vring_used_elem));
48 vhost_log_cache_used_vring(dev, vq,
49 offsetof(struct vring_used, ring[to]),
50 size * sizeof(struct vring_used_elem));
53 static __rte_always_inline void
54 flush_shadow_used_ring_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
56 uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
58 if (used_idx + vq->shadow_used_idx <= vq->size) {
59 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0,
64 /* update used ring interval [used_idx, vq->size] */
65 size = vq->size - used_idx;
66 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, size);
68 /* update the left half used ring interval [0, left_size] */
69 do_flush_shadow_used_ring_split(dev, vq, 0, size,
70 vq->shadow_used_idx - size);
72 vq->last_used_idx += vq->shadow_used_idx;
76 vhost_log_cache_sync(dev, vq);
78 *(volatile uint16_t *)&vq->used->idx += vq->shadow_used_idx;
79 vq->shadow_used_idx = 0;
80 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
81 sizeof(vq->used->idx));
84 static __rte_always_inline void
85 update_shadow_used_ring_split(struct vhost_virtqueue *vq,
86 uint16_t desc_idx, uint32_t len)
88 uint16_t i = vq->shadow_used_idx++;
90 vq->shadow_used_split[i].id = desc_idx;
91 vq->shadow_used_split[i].len = len;
94 static __rte_always_inline void
95 vhost_flush_enqueue_shadow_packed(struct virtio_net *dev,
96 struct vhost_virtqueue *vq)
99 uint16_t used_idx = vq->last_used_idx;
100 uint16_t head_idx = vq->last_used_idx;
101 uint16_t head_flags = 0;
103 /* Split loop in two to save memory barriers */
104 for (i = 0; i < vq->shadow_used_idx; i++) {
105 vq->desc_packed[used_idx].id = vq->shadow_used_packed[i].id;
106 vq->desc_packed[used_idx].len = vq->shadow_used_packed[i].len;
108 used_idx += vq->shadow_used_packed[i].count;
109 if (used_idx >= vq->size)
110 used_idx -= vq->size;
115 for (i = 0; i < vq->shadow_used_idx; i++) {
118 if (vq->shadow_used_packed[i].len)
119 flags = VRING_DESC_F_WRITE;
123 if (vq->used_wrap_counter) {
124 flags |= VRING_DESC_F_USED;
125 flags |= VRING_DESC_F_AVAIL;
127 flags &= ~VRING_DESC_F_USED;
128 flags &= ~VRING_DESC_F_AVAIL;
132 vq->desc_packed[vq->last_used_idx].flags = flags;
134 vhost_log_cache_used_vring(dev, vq,
136 sizeof(struct vring_packed_desc),
137 sizeof(struct vring_packed_desc));
139 head_idx = vq->last_used_idx;
143 vq_inc_last_used_packed(vq, vq->shadow_used_packed[i].count);
146 vq->desc_packed[head_idx].flags = head_flags;
148 vhost_log_cache_used_vring(dev, vq,
150 sizeof(struct vring_packed_desc),
151 sizeof(struct vring_packed_desc));
153 vq->shadow_used_idx = 0;
154 vhost_log_cache_sync(dev, vq);
157 static __rte_always_inline void
158 vhost_flush_dequeue_shadow_packed(struct virtio_net *dev,
159 struct vhost_virtqueue *vq)
161 struct vring_used_elem_packed *used_elem = &vq->shadow_used_packed[0];
163 vq->desc_packed[vq->shadow_last_used_idx].id = used_elem->id;
165 vq->desc_packed[vq->shadow_last_used_idx].flags = used_elem->flags;
167 vhost_log_cache_used_vring(dev, vq, vq->shadow_last_used_idx *
168 sizeof(struct vring_packed_desc),
169 sizeof(struct vring_packed_desc));
170 vq->shadow_used_idx = 0;
171 vhost_log_cache_sync(dev, vq);
174 static __rte_always_inline void
175 vhost_flush_enqueue_batch_packed(struct virtio_net *dev,
176 struct vhost_virtqueue *vq,
183 flags = PACKED_DESC_ENQUEUE_USED_FLAG(vq->used_wrap_counter);
185 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
186 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
187 vq->desc_packed[vq->last_used_idx + i].len = lens[i];
192 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
193 vq->desc_packed[vq->last_used_idx + i].flags = flags;
195 vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
196 sizeof(struct vring_packed_desc),
197 sizeof(struct vring_packed_desc) *
199 vhost_log_cache_sync(dev, vq);
201 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
204 static __rte_always_inline void
205 flush_shadow_used_ring_packed(struct virtio_net *dev,
206 struct vhost_virtqueue *vq)
209 uint16_t used_idx = vq->last_used_idx;
210 uint16_t head_idx = vq->last_used_idx;
211 uint16_t head_flags = 0;
213 /* Split loop in two to save memory barriers */
214 for (i = 0; i < vq->shadow_used_idx; i++) {
215 vq->desc_packed[used_idx].id = vq->shadow_used_packed[i].id;
216 vq->desc_packed[used_idx].len = vq->shadow_used_packed[i].len;
218 used_idx += vq->shadow_used_packed[i].count;
219 if (used_idx >= vq->size)
220 used_idx -= vq->size;
223 for (i = 0; i < vq->shadow_used_idx; i++) {
226 if (vq->shadow_used_packed[i].len)
227 flags = VRING_DESC_F_WRITE;
231 if (vq->used_wrap_counter) {
232 flags |= VRING_DESC_F_USED;
233 flags |= VRING_DESC_F_AVAIL;
235 flags &= ~VRING_DESC_F_USED;
236 flags &= ~VRING_DESC_F_AVAIL;
240 vq->desc_packed[vq->last_used_idx].flags = flags;
242 vhost_log_cache_used_vring(dev, vq,
244 sizeof(struct vring_packed_desc),
245 sizeof(struct vring_packed_desc));
247 head_idx = vq->last_used_idx;
251 vq_inc_last_used_packed(vq, vq->shadow_used_packed[i].count);
254 __atomic_store_n(&vq->desc_packed[head_idx].flags, head_flags,
257 vhost_log_cache_used_vring(dev, vq,
259 sizeof(struct vring_packed_desc),
260 sizeof(struct vring_packed_desc));
262 vq->shadow_used_idx = 0;
263 vhost_log_cache_sync(dev, vq);
266 static __rte_always_inline void
267 vhost_shadow_dequeue_batch_packed(struct virtio_net *dev,
268 struct vhost_virtqueue *vq,
275 flags = PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
277 if (!vq->shadow_used_idx) {
278 vq->shadow_last_used_idx = vq->last_used_idx;
279 vq->shadow_used_packed[0].id = ids[0];
280 vq->shadow_used_packed[0].len = 0;
281 vq->shadow_used_packed[0].count = 1;
282 vq->shadow_used_packed[0].flags = flags;
283 vq->shadow_used_idx++;
288 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE) {
289 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
290 vq->desc_packed[vq->last_used_idx + i].len = 0;
294 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE)
295 vq->desc_packed[vq->last_used_idx + i].flags = flags;
297 vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
298 sizeof(struct vring_packed_desc),
299 sizeof(struct vring_packed_desc) *
301 vhost_log_cache_sync(dev, vq);
303 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
306 static __rte_always_inline void
307 vhost_shadow_dequeue_single_packed(struct vhost_virtqueue *vq,
313 flags = vq->desc_packed[vq->last_used_idx].flags;
314 if (vq->used_wrap_counter) {
315 flags |= VRING_DESC_F_USED;
316 flags |= VRING_DESC_F_AVAIL;
318 flags &= ~VRING_DESC_F_USED;
319 flags &= ~VRING_DESC_F_AVAIL;
322 if (!vq->shadow_used_idx) {
323 vq->shadow_last_used_idx = vq->last_used_idx;
325 vq->shadow_used_packed[0].id = buf_id;
326 vq->shadow_used_packed[0].len = 0;
327 vq->shadow_used_packed[0].flags = flags;
328 vq->shadow_used_idx++;
330 vq->desc_packed[vq->last_used_idx].id = buf_id;
331 vq->desc_packed[vq->last_used_idx].len = 0;
332 vq->desc_packed[vq->last_used_idx].flags = flags;
335 vq_inc_last_used_packed(vq, count);
338 static __rte_always_inline void
339 update_shadow_used_ring_packed(struct vhost_virtqueue *vq,
340 uint16_t desc_idx, uint32_t len, uint16_t count)
342 uint16_t i = vq->shadow_used_idx++;
344 vq->shadow_used_packed[i].id = desc_idx;
345 vq->shadow_used_packed[i].len = len;
346 vq->shadow_used_packed[i].count = count;
350 do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq)
352 struct batch_copy_elem *elem = vq->batch_copy_elems;
353 uint16_t count = vq->batch_copy_nb_elems;
356 for (i = 0; i < count; i++) {
357 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
358 vhost_log_cache_write_iova(dev, vq, elem[i].log_addr,
360 PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0);
363 vq->batch_copy_nb_elems = 0;
367 do_data_copy_dequeue(struct vhost_virtqueue *vq)
369 struct batch_copy_elem *elem = vq->batch_copy_elems;
370 uint16_t count = vq->batch_copy_nb_elems;
373 for (i = 0; i < count; i++)
374 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
376 vq->batch_copy_nb_elems = 0;
379 static __rte_always_inline void
380 vhost_shadow_enqueue_single_packed(struct virtio_net *dev,
381 struct vhost_virtqueue *vq,
385 uint16_t num_buffers)
388 for (i = 0; i < num_buffers; i++) {
389 /* enqueue shadow flush action aligned with batch num */
390 if (!vq->shadow_used_idx)
391 vq->shadow_aligned_idx = vq->last_used_idx &
393 vq->shadow_used_packed[vq->shadow_used_idx].id = id[i];
394 vq->shadow_used_packed[vq->shadow_used_idx].len = len[i];
395 vq->shadow_used_packed[vq->shadow_used_idx].count = count[i];
396 vq->shadow_aligned_idx += count[i];
397 vq->shadow_used_idx++;
400 if (vq->shadow_aligned_idx >= PACKED_BATCH_SIZE) {
401 do_data_copy_enqueue(dev, vq);
402 vhost_flush_enqueue_shadow_packed(dev, vq);
406 static __rte_unused void
407 vhost_flush_dequeue_packed(struct virtio_net *dev,
408 struct vhost_virtqueue *vq)
411 if (!vq->shadow_used_idx)
414 shadow_count = vq->last_used_idx - vq->shadow_last_used_idx;
415 if (shadow_count <= 0)
416 shadow_count += vq->size;
418 if ((uint32_t)shadow_count >= (vq->size - MAX_PKT_BURST)) {
419 do_data_copy_dequeue(vq);
420 vhost_flush_dequeue_shadow_packed(dev, vq);
421 vhost_vring_call_packed(dev, vq);
425 /* avoid write operation when necessary, to lessen cache issues */
426 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
427 if ((var) != (val)) \
431 static __rte_always_inline void
432 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
434 uint64_t csum_l4 = m_buf->ol_flags & PKT_TX_L4_MASK;
436 if (m_buf->ol_flags & PKT_TX_TCP_SEG)
437 csum_l4 |= PKT_TX_TCP_CKSUM;
440 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
441 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
444 case PKT_TX_TCP_CKSUM:
445 net_hdr->csum_offset = (offsetof(struct rte_tcp_hdr,
448 case PKT_TX_UDP_CKSUM:
449 net_hdr->csum_offset = (offsetof(struct rte_udp_hdr,
452 case PKT_TX_SCTP_CKSUM:
453 net_hdr->csum_offset = (offsetof(struct rte_sctp_hdr,
458 ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
459 ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
460 ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
463 /* IP cksum verification cannot be bypassed, then calculate here */
464 if (m_buf->ol_flags & PKT_TX_IP_CKSUM) {
465 struct rte_ipv4_hdr *ipv4_hdr;
467 ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct rte_ipv4_hdr *,
469 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
472 if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
473 if (m_buf->ol_flags & PKT_TX_IPV4)
474 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
476 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
477 net_hdr->gso_size = m_buf->tso_segsz;
478 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
480 } else if (m_buf->ol_flags & PKT_TX_UDP_SEG) {
481 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
482 net_hdr->gso_size = m_buf->tso_segsz;
483 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len +
486 ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
487 ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
488 ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
492 static __rte_always_inline int
493 map_one_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
494 struct buf_vector *buf_vec, uint16_t *vec_idx,
495 uint64_t desc_iova, uint64_t desc_len, uint8_t perm)
497 uint16_t vec_id = *vec_idx;
501 uint64_t desc_chunck_len = desc_len;
503 if (unlikely(vec_id >= BUF_VECTOR_MAX))
506 desc_addr = vhost_iova_to_vva(dev, vq,
510 if (unlikely(!desc_addr))
513 rte_prefetch0((void *)(uintptr_t)desc_addr);
515 buf_vec[vec_id].buf_iova = desc_iova;
516 buf_vec[vec_id].buf_addr = desc_addr;
517 buf_vec[vec_id].buf_len = desc_chunck_len;
519 desc_len -= desc_chunck_len;
520 desc_iova += desc_chunck_len;
528 static __rte_always_inline int
529 fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
530 uint32_t avail_idx, uint16_t *vec_idx,
531 struct buf_vector *buf_vec, uint16_t *desc_chain_head,
532 uint32_t *desc_chain_len, uint8_t perm)
534 uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
535 uint16_t vec_id = *vec_idx;
538 uint32_t nr_descs = vq->size;
540 struct vring_desc *descs = vq->desc;
541 struct vring_desc *idesc = NULL;
543 if (unlikely(idx >= vq->size))
546 *desc_chain_head = idx;
548 if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
549 dlen = vq->desc[idx].len;
550 nr_descs = dlen / sizeof(struct vring_desc);
551 if (unlikely(nr_descs > vq->size))
554 descs = (struct vring_desc *)(uintptr_t)
555 vhost_iova_to_vva(dev, vq, vq->desc[idx].addr,
558 if (unlikely(!descs))
561 if (unlikely(dlen < vq->desc[idx].len)) {
563 * The indirect desc table is not contiguous
564 * in process VA space, we have to copy it.
566 idesc = vhost_alloc_copy_ind_table(dev, vq,
567 vq->desc[idx].addr, vq->desc[idx].len);
568 if (unlikely(!idesc))
578 if (unlikely(idx >= nr_descs || cnt++ >= nr_descs)) {
579 free_ind_table(idesc);
583 len += descs[idx].len;
585 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
586 descs[idx].addr, descs[idx].len,
588 free_ind_table(idesc);
592 if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
595 idx = descs[idx].next;
598 *desc_chain_len = len;
601 if (unlikely(!!idesc))
602 free_ind_table(idesc);
608 * Returns -1 on fail, 0 on success
611 reserve_avail_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
612 uint32_t size, struct buf_vector *buf_vec,
613 uint16_t *num_buffers, uint16_t avail_head,
617 uint16_t vec_idx = 0;
618 uint16_t max_tries, tries = 0;
620 uint16_t head_idx = 0;
624 cur_idx = vq->last_avail_idx;
626 if (rxvq_is_mergeable(dev))
627 max_tries = vq->size - 1;
632 if (unlikely(cur_idx == avail_head))
635 * if we tried all available ring items, and still
636 * can't get enough buf, it means something abnormal
639 if (unlikely(++tries > max_tries))
642 if (unlikely(fill_vec_buf_split(dev, vq, cur_idx,
645 VHOST_ACCESS_RW) < 0))
647 len = RTE_MIN(len, size);
648 update_shadow_used_ring_split(vq, head_idx, len);
660 static __rte_always_inline int
661 fill_vec_buf_packed_indirect(struct virtio_net *dev,
662 struct vhost_virtqueue *vq,
663 struct vring_packed_desc *desc, uint16_t *vec_idx,
664 struct buf_vector *buf_vec, uint32_t *len, uint8_t perm)
668 uint16_t vec_id = *vec_idx;
670 struct vring_packed_desc *descs, *idescs = NULL;
673 descs = (struct vring_packed_desc *)(uintptr_t)
674 vhost_iova_to_vva(dev, vq, desc->addr, &dlen, VHOST_ACCESS_RO);
675 if (unlikely(!descs))
678 if (unlikely(dlen < desc->len)) {
680 * The indirect desc table is not contiguous
681 * in process VA space, we have to copy it.
683 idescs = vhost_alloc_copy_ind_table(dev,
684 vq, desc->addr, desc->len);
685 if (unlikely(!idescs))
691 nr_descs = desc->len / sizeof(struct vring_packed_desc);
692 if (unlikely(nr_descs >= vq->size)) {
693 free_ind_table(idescs);
697 for (i = 0; i < nr_descs; i++) {
698 if (unlikely(vec_id >= BUF_VECTOR_MAX)) {
699 free_ind_table(idescs);
703 *len += descs[i].len;
704 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
705 descs[i].addr, descs[i].len,
711 if (unlikely(!!idescs))
712 free_ind_table(idescs);
717 static __rte_always_inline int
718 fill_vec_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
719 uint16_t avail_idx, uint16_t *desc_count,
720 struct buf_vector *buf_vec, uint16_t *vec_idx,
721 uint16_t *buf_id, uint32_t *len, uint8_t perm)
723 bool wrap_counter = vq->avail_wrap_counter;
724 struct vring_packed_desc *descs = vq->desc_packed;
725 uint16_t vec_id = *vec_idx;
727 if (avail_idx < vq->last_avail_idx)
731 * Perform a load-acquire barrier in desc_is_avail to
732 * enforce the ordering between desc flags and desc
735 if (unlikely(!desc_is_avail(&descs[avail_idx], wrap_counter)))
742 if (unlikely(vec_id >= BUF_VECTOR_MAX))
745 if (unlikely(*desc_count >= vq->size))
749 *buf_id = descs[avail_idx].id;
751 if (descs[avail_idx].flags & VRING_DESC_F_INDIRECT) {
752 if (unlikely(fill_vec_buf_packed_indirect(dev, vq,
758 *len += descs[avail_idx].len;
760 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
761 descs[avail_idx].addr,
762 descs[avail_idx].len,
767 if ((descs[avail_idx].flags & VRING_DESC_F_NEXT) == 0)
770 if (++avail_idx >= vq->size) {
771 avail_idx -= vq->size;
782 * Returns -1 on fail, 0 on success
785 reserve_avail_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
786 uint32_t size, struct buf_vector *buf_vec,
787 uint16_t *nr_vec, uint16_t *num_buffers,
791 uint16_t vec_idx = 0;
792 uint16_t max_tries, tries = 0;
799 avail_idx = vq->last_avail_idx;
801 if (rxvq_is_mergeable(dev))
802 max_tries = vq->size - 1;
808 * if we tried all available ring items, and still
809 * can't get enough buf, it means something abnormal
812 if (unlikely(++tries > max_tries))
815 if (unlikely(fill_vec_buf_packed(dev, vq,
816 avail_idx, &desc_count,
819 VHOST_ACCESS_RW) < 0))
822 len = RTE_MIN(len, size);
823 update_shadow_used_ring_packed(vq, buf_id, len, desc_count);
826 avail_idx += desc_count;
827 if (avail_idx >= vq->size)
828 avail_idx -= vq->size;
830 *nr_descs += desc_count;
839 static __rte_noinline void
840 copy_vnet_hdr_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
841 struct buf_vector *buf_vec,
842 struct virtio_net_hdr_mrg_rxbuf *hdr)
845 uint64_t remain = dev->vhost_hlen;
846 uint64_t src = (uint64_t)(uintptr_t)hdr, dst;
847 uint64_t iova = buf_vec->buf_iova;
850 len = RTE_MIN(remain,
852 dst = buf_vec->buf_addr;
853 rte_memcpy((void *)(uintptr_t)dst,
854 (void *)(uintptr_t)src,
857 PRINT_PACKET(dev, (uintptr_t)dst,
859 vhost_log_cache_write_iova(dev, vq,
869 static __rte_always_inline int
870 copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
871 struct rte_mbuf *m, struct buf_vector *buf_vec,
872 uint16_t nr_vec, uint16_t num_buffers)
874 uint32_t vec_idx = 0;
875 uint32_t mbuf_offset, mbuf_avail;
876 uint32_t buf_offset, buf_avail;
877 uint64_t buf_addr, buf_iova, buf_len;
880 struct rte_mbuf *hdr_mbuf;
881 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
882 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
885 if (unlikely(m == NULL)) {
890 buf_addr = buf_vec[vec_idx].buf_addr;
891 buf_iova = buf_vec[vec_idx].buf_iova;
892 buf_len = buf_vec[vec_idx].buf_len;
894 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
901 if (unlikely(buf_len < dev->vhost_hlen))
904 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
906 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) RX: num merge buffers %d\n",
907 dev->vid, num_buffers);
909 if (unlikely(buf_len < dev->vhost_hlen)) {
910 buf_offset = dev->vhost_hlen - buf_len;
912 buf_addr = buf_vec[vec_idx].buf_addr;
913 buf_iova = buf_vec[vec_idx].buf_iova;
914 buf_len = buf_vec[vec_idx].buf_len;
915 buf_avail = buf_len - buf_offset;
917 buf_offset = dev->vhost_hlen;
918 buf_avail = buf_len - dev->vhost_hlen;
921 mbuf_avail = rte_pktmbuf_data_len(m);
923 while (mbuf_avail != 0 || m->next != NULL) {
924 /* done with current buf, get the next one */
925 if (buf_avail == 0) {
927 if (unlikely(vec_idx >= nr_vec)) {
932 buf_addr = buf_vec[vec_idx].buf_addr;
933 buf_iova = buf_vec[vec_idx].buf_iova;
934 buf_len = buf_vec[vec_idx].buf_len;
940 /* done with current mbuf, get the next one */
941 if (mbuf_avail == 0) {
945 mbuf_avail = rte_pktmbuf_data_len(m);
949 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
950 if (rxvq_is_mergeable(dev))
951 ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
954 if (unlikely(hdr == &tmp_hdr)) {
955 copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
957 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
959 vhost_log_cache_write_iova(dev, vq,
967 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
969 if (likely(cpy_len > MAX_BATCH_LEN ||
970 vq->batch_copy_nb_elems >= vq->size)) {
971 rte_memcpy((void *)((uintptr_t)(buf_addr + buf_offset)),
972 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
974 vhost_log_cache_write_iova(dev, vq,
975 buf_iova + buf_offset,
977 PRINT_PACKET(dev, (uintptr_t)(buf_addr + buf_offset),
980 batch_copy[vq->batch_copy_nb_elems].dst =
981 (void *)((uintptr_t)(buf_addr + buf_offset));
982 batch_copy[vq->batch_copy_nb_elems].src =
983 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
984 batch_copy[vq->batch_copy_nb_elems].log_addr =
985 buf_iova + buf_offset;
986 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
987 vq->batch_copy_nb_elems++;
990 mbuf_avail -= cpy_len;
991 mbuf_offset += cpy_len;
992 buf_avail -= cpy_len;
993 buf_offset += cpy_len;
1001 static __rte_always_inline int
1002 vhost_enqueue_single_packed(struct virtio_net *dev,
1003 struct vhost_virtqueue *vq,
1004 struct rte_mbuf *pkt,
1005 struct buf_vector *buf_vec,
1008 uint16_t nr_vec = 0;
1009 uint16_t avail_idx = vq->last_avail_idx;
1010 uint16_t max_tries, tries = 0;
1011 uint16_t buf_id = 0;
1013 uint16_t desc_count;
1014 uint32_t size = pkt->pkt_len + dev->vhost_hlen;
1015 uint16_t num_buffers = 0;
1016 uint32_t buffer_len[vq->size];
1017 uint16_t buffer_buf_id[vq->size];
1018 uint16_t buffer_desc_count[vq->size];
1020 if (rxvq_is_mergeable(dev))
1021 max_tries = vq->size - 1;
1027 * if we tried all available ring items, and still
1028 * can't get enough buf, it means something abnormal
1031 if (unlikely(++tries > max_tries))
1034 if (unlikely(fill_vec_buf_packed(dev, vq,
1035 avail_idx, &desc_count,
1038 VHOST_ACCESS_RW) < 0))
1041 len = RTE_MIN(len, size);
1044 buffer_len[num_buffers] = len;
1045 buffer_buf_id[num_buffers] = buf_id;
1046 buffer_desc_count[num_buffers] = desc_count;
1049 *nr_descs += desc_count;
1050 avail_idx += desc_count;
1051 if (avail_idx >= vq->size)
1052 avail_idx -= vq->size;
1055 if (copy_mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, num_buffers) < 0)
1058 vhost_shadow_enqueue_single_packed(dev, vq, buffer_len, buffer_buf_id,
1059 buffer_desc_count, num_buffers);
1064 static __rte_noinline uint32_t
1065 virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
1066 struct rte_mbuf **pkts, uint32_t count)
1068 uint32_t pkt_idx = 0;
1069 uint16_t num_buffers;
1070 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1071 uint16_t avail_head;
1073 avail_head = *((volatile uint16_t *)&vq->avail->idx);
1076 * The ordering between avail index and
1077 * desc reads needs to be enforced.
1081 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1083 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1084 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1085 uint16_t nr_vec = 0;
1087 if (unlikely(reserve_avail_buf_split(dev, vq,
1088 pkt_len, buf_vec, &num_buffers,
1089 avail_head, &nr_vec) < 0)) {
1090 VHOST_LOG_DEBUG(VHOST_DATA,
1091 "(%d) failed to get enough desc from vring\n",
1093 vq->shadow_used_idx -= num_buffers;
1097 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n",
1098 dev->vid, vq->last_avail_idx,
1099 vq->last_avail_idx + num_buffers);
1101 if (copy_mbuf_to_desc(dev, vq, pkts[pkt_idx],
1104 vq->shadow_used_idx -= num_buffers;
1108 vq->last_avail_idx += num_buffers;
1111 do_data_copy_enqueue(dev, vq);
1113 if (likely(vq->shadow_used_idx)) {
1114 flush_shadow_used_ring_split(dev, vq);
1115 vhost_vring_call_split(dev, vq);
1121 static __rte_unused int
1122 virtio_dev_rx_batch_packed(struct virtio_net *dev,
1123 struct vhost_virtqueue *vq,
1124 struct rte_mbuf **pkts)
1126 bool wrap_counter = vq->avail_wrap_counter;
1127 struct vring_packed_desc *descs = vq->desc_packed;
1128 uint16_t avail_idx = vq->last_avail_idx;
1129 uint64_t desc_addrs[PACKED_BATCH_SIZE];
1130 struct virtio_net_hdr_mrg_rxbuf *hdrs[PACKED_BATCH_SIZE];
1131 uint32_t buf_offset = dev->vhost_hlen;
1132 uint64_t lens[PACKED_BATCH_SIZE];
1133 uint16_t ids[PACKED_BATCH_SIZE];
1136 if (unlikely(avail_idx & PACKED_BATCH_MASK))
1139 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
1142 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1143 if (unlikely(pkts[i]->next != NULL))
1145 if (unlikely(!desc_is_avail(&descs[avail_idx + i],
1152 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1153 lens[i] = descs[avail_idx + i].len;
1155 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1156 if (unlikely(pkts[i]->pkt_len > (lens[i] - buf_offset)))
1160 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1161 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
1162 descs[avail_idx + i].addr,
1166 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1167 if (unlikely(lens[i] != descs[avail_idx + i].len))
1171 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1172 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
1173 hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)
1174 (uintptr_t)desc_addrs[i];
1175 lens[i] = pkts[i]->pkt_len + dev->vhost_hlen;
1178 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1179 virtio_enqueue_offload(pkts[i], &hdrs[i]->hdr);
1181 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
1183 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1184 rte_memcpy((void *)(uintptr_t)(desc_addrs[i] + buf_offset),
1185 rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
1189 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1190 ids[i] = descs[avail_idx + i].id;
1192 vhost_flush_enqueue_batch_packed(dev, vq, lens, ids);
1197 static __rte_unused int16_t
1198 virtio_dev_rx_single_packed(struct virtio_net *dev,
1199 struct vhost_virtqueue *vq,
1200 struct rte_mbuf *pkt)
1202 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1203 uint16_t nr_descs = 0;
1206 if (unlikely(vhost_enqueue_single_packed(dev, vq, pkt, buf_vec,
1208 VHOST_LOG_DEBUG(VHOST_DATA,
1209 "(%d) failed to get enough desc from vring\n",
1214 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n",
1215 dev->vid, vq->last_avail_idx,
1216 vq->last_avail_idx + nr_descs);
1218 vq_inc_last_avail_packed(vq, nr_descs);
1223 static __rte_noinline uint32_t
1224 virtio_dev_rx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
1225 struct rte_mbuf **pkts, uint32_t count)
1227 uint32_t pkt_idx = 0;
1228 uint16_t num_buffers;
1229 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1231 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1232 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1233 uint16_t nr_vec = 0;
1234 uint16_t nr_descs = 0;
1236 if (unlikely(reserve_avail_buf_packed(dev, vq,
1237 pkt_len, buf_vec, &nr_vec,
1238 &num_buffers, &nr_descs) < 0)) {
1239 VHOST_LOG_DEBUG(VHOST_DATA,
1240 "(%d) failed to get enough desc from vring\n",
1242 vq->shadow_used_idx -= num_buffers;
1246 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n",
1247 dev->vid, vq->last_avail_idx,
1248 vq->last_avail_idx + num_buffers);
1250 if (copy_mbuf_to_desc(dev, vq, pkts[pkt_idx],
1253 vq->shadow_used_idx -= num_buffers;
1257 vq_inc_last_avail_packed(vq, nr_descs);
1260 do_data_copy_enqueue(dev, vq);
1262 if (likely(vq->shadow_used_idx)) {
1263 vhost_flush_enqueue_shadow_packed(dev, vq);
1264 vhost_vring_call_packed(dev, vq);
1270 static __rte_always_inline uint32_t
1271 virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
1272 struct rte_mbuf **pkts, uint32_t count)
1274 struct vhost_virtqueue *vq;
1277 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
1278 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1279 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
1280 dev->vid, __func__, queue_id);
1284 vq = dev->virtqueue[queue_id];
1286 rte_spinlock_lock(&vq->access_lock);
1288 if (unlikely(vq->enabled == 0))
1289 goto out_access_unlock;
1291 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1292 vhost_user_iotlb_rd_lock(vq);
1294 if (unlikely(vq->access_ok == 0))
1295 if (unlikely(vring_translate(dev, vq) < 0))
1298 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
1302 if (vq_is_packed(dev))
1303 nb_tx = virtio_dev_rx_packed(dev, vq, pkts, count);
1305 nb_tx = virtio_dev_rx_split(dev, vq, pkts, count);
1308 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1309 vhost_user_iotlb_rd_unlock(vq);
1312 rte_spinlock_unlock(&vq->access_lock);
1318 rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
1319 struct rte_mbuf **pkts, uint16_t count)
1321 struct virtio_net *dev = get_device(vid);
1326 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
1327 RTE_LOG(ERR, VHOST_DATA,
1328 "(%d) %s: built-in vhost net backend is disabled.\n",
1329 dev->vid, __func__);
1333 return virtio_dev_rx(dev, queue_id, pkts, count);
1337 virtio_net_with_host_offload(struct virtio_net *dev)
1340 ((1ULL << VIRTIO_NET_F_CSUM) |
1341 (1ULL << VIRTIO_NET_F_HOST_ECN) |
1342 (1ULL << VIRTIO_NET_F_HOST_TSO4) |
1343 (1ULL << VIRTIO_NET_F_HOST_TSO6) |
1344 (1ULL << VIRTIO_NET_F_HOST_UFO)))
1351 parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
1353 struct rte_ipv4_hdr *ipv4_hdr;
1354 struct rte_ipv6_hdr *ipv6_hdr;
1355 void *l3_hdr = NULL;
1356 struct rte_ether_hdr *eth_hdr;
1359 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
1361 m->l2_len = sizeof(struct rte_ether_hdr);
1362 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
1364 if (ethertype == RTE_ETHER_TYPE_VLAN) {
1365 struct rte_vlan_hdr *vlan_hdr =
1366 (struct rte_vlan_hdr *)(eth_hdr + 1);
1368 m->l2_len += sizeof(struct rte_vlan_hdr);
1369 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
1372 l3_hdr = (char *)eth_hdr + m->l2_len;
1374 switch (ethertype) {
1375 case RTE_ETHER_TYPE_IPV4:
1377 *l4_proto = ipv4_hdr->next_proto_id;
1378 m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
1379 *l4_hdr = (char *)l3_hdr + m->l3_len;
1380 m->ol_flags |= PKT_TX_IPV4;
1382 case RTE_ETHER_TYPE_IPV6:
1384 *l4_proto = ipv6_hdr->proto;
1385 m->l3_len = sizeof(struct rte_ipv6_hdr);
1386 *l4_hdr = (char *)l3_hdr + m->l3_len;
1387 m->ol_flags |= PKT_TX_IPV6;
1397 static __rte_always_inline void
1398 vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
1400 uint16_t l4_proto = 0;
1401 void *l4_hdr = NULL;
1402 struct rte_tcp_hdr *tcp_hdr = NULL;
1404 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1407 parse_ethernet(m, &l4_proto, &l4_hdr);
1408 if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1409 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
1410 switch (hdr->csum_offset) {
1411 case (offsetof(struct rte_tcp_hdr, cksum)):
1412 if (l4_proto == IPPROTO_TCP)
1413 m->ol_flags |= PKT_TX_TCP_CKSUM;
1415 case (offsetof(struct rte_udp_hdr, dgram_cksum)):
1416 if (l4_proto == IPPROTO_UDP)
1417 m->ol_flags |= PKT_TX_UDP_CKSUM;
1419 case (offsetof(struct rte_sctp_hdr, cksum)):
1420 if (l4_proto == IPPROTO_SCTP)
1421 m->ol_flags |= PKT_TX_SCTP_CKSUM;
1429 if (l4_hdr && hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1430 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1431 case VIRTIO_NET_HDR_GSO_TCPV4:
1432 case VIRTIO_NET_HDR_GSO_TCPV6:
1434 m->ol_flags |= PKT_TX_TCP_SEG;
1435 m->tso_segsz = hdr->gso_size;
1436 m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
1438 case VIRTIO_NET_HDR_GSO_UDP:
1439 m->ol_flags |= PKT_TX_UDP_SEG;
1440 m->tso_segsz = hdr->gso_size;
1441 m->l4_len = sizeof(struct rte_udp_hdr);
1444 RTE_LOG(WARNING, VHOST_DATA,
1445 "unsupported gso type %u.\n", hdr->gso_type);
1451 static __rte_noinline void
1452 copy_vnet_hdr_from_desc(struct virtio_net_hdr *hdr,
1453 struct buf_vector *buf_vec)
1456 uint64_t remain = sizeof(struct virtio_net_hdr);
1458 uint64_t dst = (uint64_t)(uintptr_t)hdr;
1461 len = RTE_MIN(remain, buf_vec->buf_len);
1462 src = buf_vec->buf_addr;
1463 rte_memcpy((void *)(uintptr_t)dst,
1464 (void *)(uintptr_t)src, len);
1472 static __rte_always_inline int
1473 copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
1474 struct buf_vector *buf_vec, uint16_t nr_vec,
1475 struct rte_mbuf *m, struct rte_mempool *mbuf_pool)
1477 uint32_t buf_avail, buf_offset;
1478 uint64_t buf_addr, buf_iova, buf_len;
1479 uint32_t mbuf_avail, mbuf_offset;
1481 struct rte_mbuf *cur = m, *prev = m;
1482 struct virtio_net_hdr tmp_hdr;
1483 struct virtio_net_hdr *hdr = NULL;
1484 /* A counter to avoid desc dead loop chain */
1485 uint16_t vec_idx = 0;
1486 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
1489 buf_addr = buf_vec[vec_idx].buf_addr;
1490 buf_iova = buf_vec[vec_idx].buf_iova;
1491 buf_len = buf_vec[vec_idx].buf_len;
1493 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
1498 if (virtio_net_with_host_offload(dev)) {
1499 if (unlikely(buf_len < sizeof(struct virtio_net_hdr))) {
1501 * No luck, the virtio-net header doesn't fit
1502 * in a contiguous virtual area.
1504 copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec);
1507 hdr = (struct virtio_net_hdr *)((uintptr_t)buf_addr);
1512 * A virtio driver normally uses at least 2 desc buffers
1513 * for Tx: the first for storing the header, and others
1514 * for storing the data.
1516 if (unlikely(buf_len < dev->vhost_hlen)) {
1517 buf_offset = dev->vhost_hlen - buf_len;
1519 buf_addr = buf_vec[vec_idx].buf_addr;
1520 buf_iova = buf_vec[vec_idx].buf_iova;
1521 buf_len = buf_vec[vec_idx].buf_len;
1522 buf_avail = buf_len - buf_offset;
1523 } else if (buf_len == dev->vhost_hlen) {
1524 if (unlikely(++vec_idx >= nr_vec))
1526 buf_addr = buf_vec[vec_idx].buf_addr;
1527 buf_iova = buf_vec[vec_idx].buf_iova;
1528 buf_len = buf_vec[vec_idx].buf_len;
1531 buf_avail = buf_len;
1533 buf_offset = dev->vhost_hlen;
1534 buf_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
1538 (uintptr_t)(buf_addr + buf_offset),
1539 (uint32_t)buf_avail, 0);
1542 mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
1546 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
1549 * A desc buf might across two host physical pages that are
1550 * not continuous. In such case (gpa_to_hpa returns 0), data
1551 * will be copied even though zero copy is enabled.
1553 if (unlikely(dev->dequeue_zero_copy && (hpa = gpa_to_hpa(dev,
1554 buf_iova + buf_offset, cpy_len)))) {
1555 cur->data_len = cpy_len;
1558 (void *)(uintptr_t)(buf_addr + buf_offset);
1559 cur->buf_iova = hpa;
1562 * In zero copy mode, one mbuf can only reference data
1563 * for one or partial of one desc buff.
1565 mbuf_avail = cpy_len;
1567 if (likely(cpy_len > MAX_BATCH_LEN ||
1568 vq->batch_copy_nb_elems >= vq->size ||
1569 (hdr && cur == m))) {
1570 rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
1572 (void *)((uintptr_t)(buf_addr +
1576 batch_copy[vq->batch_copy_nb_elems].dst =
1577 rte_pktmbuf_mtod_offset(cur, void *,
1579 batch_copy[vq->batch_copy_nb_elems].src =
1580 (void *)((uintptr_t)(buf_addr +
1582 batch_copy[vq->batch_copy_nb_elems].len =
1584 vq->batch_copy_nb_elems++;
1588 mbuf_avail -= cpy_len;
1589 mbuf_offset += cpy_len;
1590 buf_avail -= cpy_len;
1591 buf_offset += cpy_len;
1593 /* This buf reaches to its end, get the next one */
1594 if (buf_avail == 0) {
1595 if (++vec_idx >= nr_vec)
1598 buf_addr = buf_vec[vec_idx].buf_addr;
1599 buf_iova = buf_vec[vec_idx].buf_iova;
1600 buf_len = buf_vec[vec_idx].buf_len;
1603 buf_avail = buf_len;
1605 PRINT_PACKET(dev, (uintptr_t)buf_addr,
1606 (uint32_t)buf_avail, 0);
1610 * This mbuf reaches to its end, get a new one
1611 * to hold more data.
1613 if (mbuf_avail == 0) {
1614 cur = rte_pktmbuf_alloc(mbuf_pool);
1615 if (unlikely(cur == NULL)) {
1616 RTE_LOG(ERR, VHOST_DATA, "Failed to "
1617 "allocate memory for mbuf.\n");
1621 if (unlikely(dev->dequeue_zero_copy))
1622 rte_mbuf_refcnt_update(cur, 1);
1625 prev->data_len = mbuf_offset;
1627 m->pkt_len += mbuf_offset;
1631 mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
1635 prev->data_len = mbuf_offset;
1636 m->pkt_len += mbuf_offset;
1639 vhost_dequeue_offload(hdr, m);
1646 static __rte_always_inline struct zcopy_mbuf *
1647 get_zmbuf(struct vhost_virtqueue *vq)
1653 /* search [last_zmbuf_idx, zmbuf_size) */
1654 i = vq->last_zmbuf_idx;
1655 last = vq->zmbuf_size;
1658 for (; i < last; i++) {
1659 if (vq->zmbufs[i].in_use == 0) {
1660 vq->last_zmbuf_idx = i + 1;
1661 vq->zmbufs[i].in_use = 1;
1662 return &vq->zmbufs[i];
1668 /* search [0, last_zmbuf_idx) */
1670 last = vq->last_zmbuf_idx;
1678 virtio_dev_extbuf_free(void *addr __rte_unused, void *opaque)
1684 virtio_dev_extbuf_alloc(struct rte_mbuf *pkt, uint32_t size)
1686 struct rte_mbuf_ext_shared_info *shinfo = NULL;
1687 uint32_t total_len = RTE_PKTMBUF_HEADROOM + size;
1692 /* Try to use pkt buffer to store shinfo to reduce the amount of memory
1693 * required, otherwise store shinfo in the new buffer.
1695 if (rte_pktmbuf_tailroom(pkt) >= sizeof(*shinfo))
1696 shinfo = rte_pktmbuf_mtod(pkt,
1697 struct rte_mbuf_ext_shared_info *);
1699 total_len += sizeof(*shinfo) + sizeof(uintptr_t);
1700 total_len = RTE_ALIGN_CEIL(total_len, sizeof(uintptr_t));
1703 if (unlikely(total_len > UINT16_MAX))
1706 buf_len = total_len;
1707 buf = rte_malloc(NULL, buf_len, RTE_CACHE_LINE_SIZE);
1708 if (unlikely(buf == NULL))
1711 /* Initialize shinfo */
1713 shinfo->free_cb = virtio_dev_extbuf_free;
1714 shinfo->fcb_opaque = buf;
1715 rte_mbuf_ext_refcnt_set(shinfo, 1);
1717 shinfo = rte_pktmbuf_ext_shinfo_init_helper(buf, &buf_len,
1718 virtio_dev_extbuf_free, buf);
1719 if (unlikely(shinfo == NULL)) {
1721 RTE_LOG(ERR, VHOST_DATA, "Failed to init shinfo\n");
1726 iova = rte_malloc_virt2iova(buf);
1727 rte_pktmbuf_attach_extbuf(pkt, buf, iova, buf_len, shinfo);
1728 rte_pktmbuf_reset_headroom(pkt);
1734 * Allocate a host supported pktmbuf.
1736 static __rte_always_inline struct rte_mbuf *
1737 virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
1740 struct rte_mbuf *pkt = rte_pktmbuf_alloc(mp);
1742 if (unlikely(pkt == NULL))
1745 if (rte_pktmbuf_tailroom(pkt) >= data_len)
1748 /* attach an external buffer if supported */
1749 if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
1752 /* check if chained buffers are allowed */
1753 if (!dev->linearbuf)
1756 /* Data doesn't fit into the buffer and the host supports
1757 * only linear buffers
1759 rte_pktmbuf_free(pkt);
1764 static __rte_noinline uint16_t
1765 virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
1766 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
1769 uint16_t free_entries;
1771 if (unlikely(dev->dequeue_zero_copy)) {
1772 struct zcopy_mbuf *zmbuf, *next;
1774 for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
1775 zmbuf != NULL; zmbuf = next) {
1776 next = TAILQ_NEXT(zmbuf, next);
1778 if (mbuf_is_consumed(zmbuf->mbuf)) {
1779 update_shadow_used_ring_split(vq,
1780 zmbuf->desc_idx, 0);
1781 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
1782 restore_mbuf(zmbuf->mbuf);
1783 rte_pktmbuf_free(zmbuf->mbuf);
1789 if (likely(vq->shadow_used_idx)) {
1790 flush_shadow_used_ring_split(dev, vq);
1791 vhost_vring_call_split(dev, vq);
1795 free_entries = *((volatile uint16_t *)&vq->avail->idx) -
1797 if (free_entries == 0)
1801 * The ordering between avail index and
1802 * desc reads needs to be enforced.
1806 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1808 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
1810 count = RTE_MIN(count, MAX_PKT_BURST);
1811 count = RTE_MIN(count, free_entries);
1812 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) about to dequeue %u buffers\n",
1815 for (i = 0; i < count; i++) {
1816 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1819 uint16_t nr_vec = 0;
1822 if (unlikely(fill_vec_buf_split(dev, vq,
1823 vq->last_avail_idx + i,
1825 &head_idx, &buf_len,
1826 VHOST_ACCESS_RO) < 0))
1829 if (likely(dev->dequeue_zero_copy == 0))
1830 update_shadow_used_ring_split(vq, head_idx, 0);
1832 pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
1833 if (unlikely(pkts[i] == NULL))
1836 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts[i],
1838 if (unlikely(err)) {
1839 rte_pktmbuf_free(pkts[i]);
1843 if (unlikely(dev->dequeue_zero_copy)) {
1844 struct zcopy_mbuf *zmbuf;
1846 zmbuf = get_zmbuf(vq);
1848 rte_pktmbuf_free(pkts[i]);
1851 zmbuf->mbuf = pkts[i];
1852 zmbuf->desc_idx = head_idx;
1855 * Pin lock the mbuf; we will check later to see
1856 * whether the mbuf is freed (when we are the last
1857 * user) or not. If that's the case, we then could
1858 * update the used ring safely.
1860 rte_mbuf_refcnt_update(pkts[i], 1);
1863 TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next);
1866 vq->last_avail_idx += i;
1868 if (likely(dev->dequeue_zero_copy == 0)) {
1869 do_data_copy_dequeue(vq);
1870 if (unlikely(i < count))
1871 vq->shadow_used_idx = i;
1872 if (likely(vq->shadow_used_idx)) {
1873 flush_shadow_used_ring_split(dev, vq);
1874 vhost_vring_call_split(dev, vq);
1881 static __rte_always_inline int
1882 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
1883 struct vhost_virtqueue *vq,
1884 struct rte_mempool *mbuf_pool,
1885 struct rte_mbuf **pkts,
1887 uintptr_t *desc_addrs,
1890 bool wrap = vq->avail_wrap_counter;
1891 struct vring_packed_desc *descs = vq->desc_packed;
1892 struct virtio_net_hdr *hdr;
1893 uint64_t lens[PACKED_BATCH_SIZE];
1894 uint64_t buf_lens[PACKED_BATCH_SIZE];
1895 uint32_t buf_offset = dev->vhost_hlen;
1898 if (unlikely(avail_idx & PACKED_BATCH_MASK))
1900 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
1903 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1904 flags = descs[avail_idx + i].flags;
1905 if (unlikely((wrap != !!(flags & VRING_DESC_F_AVAIL)) ||
1906 (wrap == !!(flags & VRING_DESC_F_USED)) ||
1907 (flags & PACKED_DESC_SINGLE_DEQUEUE_FLAG)))
1913 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1914 lens[i] = descs[avail_idx + i].len;
1916 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1917 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
1918 descs[avail_idx + i].addr,
1919 &lens[i], VHOST_ACCESS_RW);
1922 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1923 if (unlikely((lens[i] != descs[avail_idx + i].len)))
1927 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1928 pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
1933 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1934 buf_lens[i] = pkts[i]->buf_len - pkts[i]->data_off;
1936 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1937 if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
1941 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1942 pkts[i]->pkt_len = descs[avail_idx + i].len - buf_offset;
1943 pkts[i]->data_len = pkts[i]->pkt_len;
1944 ids[i] = descs[avail_idx + i].id;
1947 if (virtio_net_with_host_offload(dev)) {
1948 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1949 hdr = (struct virtio_net_hdr *)(desc_addrs[i]);
1950 vhost_dequeue_offload(hdr, pkts[i]);
1957 for (i = 0; i < PACKED_BATCH_SIZE; i++)
1958 rte_pktmbuf_free(pkts[i]);
1963 static __rte_unused int
1964 virtio_dev_tx_batch_packed(struct virtio_net *dev,
1965 struct vhost_virtqueue *vq,
1966 struct rte_mempool *mbuf_pool,
1967 struct rte_mbuf **pkts)
1969 uint16_t avail_idx = vq->last_avail_idx;
1970 uint32_t buf_offset = dev->vhost_hlen;
1971 uintptr_t desc_addrs[PACKED_BATCH_SIZE];
1972 uint16_t ids[PACKED_BATCH_SIZE];
1975 if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
1976 avail_idx, desc_addrs, ids))
1979 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1980 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
1982 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1983 rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
1984 (void *)(uintptr_t)(desc_addrs[i] + buf_offset),
1987 vhost_shadow_dequeue_batch_packed(dev, vq, ids);
1989 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
1994 static __rte_always_inline int
1995 vhost_dequeue_single_packed(struct virtio_net *dev,
1996 struct vhost_virtqueue *vq,
1997 struct rte_mempool *mbuf_pool,
1998 struct rte_mbuf **pkts,
2000 uint16_t *desc_count)
2002 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2004 uint16_t nr_vec = 0;
2007 if (unlikely(fill_vec_buf_packed(dev, vq,
2008 vq->last_avail_idx, desc_count,
2011 VHOST_ACCESS_RO) < 0))
2014 *pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
2015 if (unlikely(*pkts == NULL)) {
2016 RTE_LOG(ERR, VHOST_DATA,
2017 "Failed to allocate memory for mbuf.\n");
2021 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
2023 if (unlikely(err)) {
2024 rte_pktmbuf_free(*pkts);
2031 static __rte_unused int
2032 virtio_dev_tx_single_packed(struct virtio_net *dev,
2033 struct vhost_virtqueue *vq,
2034 struct rte_mempool *mbuf_pool,
2035 struct rte_mbuf **pkts)
2038 uint16_t buf_id, desc_count;
2040 if (vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id,
2044 vhost_shadow_dequeue_single_packed(vq, buf_id, desc_count);
2046 vq_inc_last_avail_packed(vq, desc_count);
2051 static __rte_noinline uint16_t
2052 virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
2053 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
2057 if (unlikely(dev->dequeue_zero_copy)) {
2058 struct zcopy_mbuf *zmbuf, *next;
2060 for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
2061 zmbuf != NULL; zmbuf = next) {
2062 next = TAILQ_NEXT(zmbuf, next);
2064 if (mbuf_is_consumed(zmbuf->mbuf)) {
2065 update_shadow_used_ring_packed(vq,
2070 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
2071 restore_mbuf(zmbuf->mbuf);
2072 rte_pktmbuf_free(zmbuf->mbuf);
2078 if (likely(vq->shadow_used_idx)) {
2079 flush_shadow_used_ring_packed(dev, vq);
2080 vhost_vring_call_packed(dev, vq);
2084 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
2086 count = RTE_MIN(count, MAX_PKT_BURST);
2087 VHOST_LOG_DEBUG(VHOST_DATA, "(%d) about to dequeue %u buffers\n",
2090 for (i = 0; i < count; i++) {
2091 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2094 uint16_t desc_count, nr_vec = 0;
2097 if (unlikely(fill_vec_buf_packed(dev, vq,
2098 vq->last_avail_idx, &desc_count,
2101 VHOST_ACCESS_RO) < 0))
2104 if (likely(dev->dequeue_zero_copy == 0))
2105 update_shadow_used_ring_packed(vq, buf_id, 0,
2108 pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
2109 if (unlikely(pkts[i] == NULL))
2112 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts[i],
2114 if (unlikely(err)) {
2115 rte_pktmbuf_free(pkts[i]);
2119 if (unlikely(dev->dequeue_zero_copy)) {
2120 struct zcopy_mbuf *zmbuf;
2122 zmbuf = get_zmbuf(vq);
2124 rte_pktmbuf_free(pkts[i]);
2127 zmbuf->mbuf = pkts[i];
2128 zmbuf->desc_idx = buf_id;
2129 zmbuf->desc_count = desc_count;
2132 * Pin lock the mbuf; we will check later to see
2133 * whether the mbuf is freed (when we are the last
2134 * user) or not. If that's the case, we then could
2135 * update the used ring safely.
2137 rte_mbuf_refcnt_update(pkts[i], 1);
2140 TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next);
2143 vq_inc_last_avail_packed(vq, desc_count);
2146 if (likely(dev->dequeue_zero_copy == 0)) {
2147 do_data_copy_dequeue(vq);
2148 if (unlikely(i < count))
2149 vq->shadow_used_idx = i;
2150 if (likely(vq->shadow_used_idx)) {
2151 flush_shadow_used_ring_packed(dev, vq);
2152 vhost_vring_call_packed(dev, vq);
2160 rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
2161 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
2163 struct virtio_net *dev;
2164 struct rte_mbuf *rarp_mbuf = NULL;
2165 struct vhost_virtqueue *vq;
2167 dev = get_device(vid);
2171 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
2172 RTE_LOG(ERR, VHOST_DATA,
2173 "(%d) %s: built-in vhost net backend is disabled.\n",
2174 dev->vid, __func__);
2178 if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
2179 RTE_LOG(ERR, VHOST_DATA, "(%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 * rte_atomic16_cmpset() causes a write if using cmpxchg. This could
2212 * result in false sharing between enqueue and dequeue.
2214 * Prevent unnecessary false sharing by reading broadcast_rarp first
2215 * and only performing cmpset if the read indicates it is likely to
2218 if (unlikely(rte_atomic16_read(&dev->broadcast_rarp) &&
2219 rte_atomic16_cmpset((volatile uint16_t *)
2220 &dev->broadcast_rarp.cnt, 1, 0))) {
2222 rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac);
2223 if (rarp_mbuf == NULL) {
2224 RTE_LOG(ERR, VHOST_DATA,
2225 "Failed to make RARP packet.\n");
2232 if (vq_is_packed(dev))
2233 count = virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, count);
2235 count = virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count);
2238 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2239 vhost_user_iotlb_rd_unlock(vq);
2242 rte_spinlock_unlock(&vq->access_lock);
2244 if (unlikely(rarp_mbuf != NULL)) {
2246 * Inject it to the head of "pkts" array, so that switch's mac
2247 * learning table will get updated first.
2249 memmove(&pkts[1], pkts, count * sizeof(struct rte_mbuf *));
2250 pkts[0] = rarp_mbuf;