4 * Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
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8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
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22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <linux/virtio_net.h>
39 #include <rte_memcpy.h>
40 #include <rte_ether.h>
42 #include <rte_vhost.h>
47 #include <rte_spinlock.h>
48 #include <rte_malloc.h>
53 #define MAX_PKT_BURST 32
55 #define MAX_BATCH_LEN 256
58 is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
60 return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
63 static __rte_always_inline struct vring_desc *
64 alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
65 struct vring_desc *desc)
67 struct vring_desc *idesc;
69 uint64_t len, remain = desc->len;
70 uint64_t desc_addr = desc->addr;
72 idesc = rte_malloc(__func__, desc->len, 0);
76 dst = (uint64_t)(uintptr_t)idesc;
80 src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
82 if (unlikely(!src || !len)) {
87 rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
97 static __rte_always_inline void
98 free_ind_table(struct vring_desc *idesc)
103 static __rte_always_inline void
104 do_flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq,
105 uint16_t to, uint16_t from, uint16_t size)
107 rte_memcpy(&vq->used->ring[to],
108 &vq->shadow_used_ring[from],
109 size * sizeof(struct vring_used_elem));
110 vhost_log_cache_used_vring(dev, vq,
111 offsetof(struct vring_used, ring[to]),
112 size * sizeof(struct vring_used_elem));
115 static __rte_always_inline void
116 flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq)
118 uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
120 if (used_idx + vq->shadow_used_idx <= vq->size) {
121 do_flush_shadow_used_ring(dev, vq, used_idx, 0,
122 vq->shadow_used_idx);
126 /* update used ring interval [used_idx, vq->size] */
127 size = vq->size - used_idx;
128 do_flush_shadow_used_ring(dev, vq, used_idx, 0, size);
130 /* update the left half used ring interval [0, left_size] */
131 do_flush_shadow_used_ring(dev, vq, 0, size,
132 vq->shadow_used_idx - size);
134 vq->last_used_idx += vq->shadow_used_idx;
138 vhost_log_cache_sync(dev, vq);
140 *(volatile uint16_t *)&vq->used->idx += vq->shadow_used_idx;
141 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
142 sizeof(vq->used->idx));
145 static __rte_always_inline void
146 update_shadow_used_ring(struct vhost_virtqueue *vq,
147 uint16_t desc_idx, uint16_t len)
149 uint16_t i = vq->shadow_used_idx++;
151 vq->shadow_used_ring[i].id = desc_idx;
152 vq->shadow_used_ring[i].len = len;
156 do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq)
158 struct batch_copy_elem *elem = vq->batch_copy_elems;
159 uint16_t count = vq->batch_copy_nb_elems;
162 for (i = 0; i < count; i++) {
163 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
164 vhost_log_cache_write(dev, vq, elem[i].log_addr, elem[i].len);
165 PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0);
170 do_data_copy_dequeue(struct vhost_virtqueue *vq)
172 struct batch_copy_elem *elem = vq->batch_copy_elems;
173 uint16_t count = vq->batch_copy_nb_elems;
176 for (i = 0; i < count; i++)
177 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
180 /* avoid write operation when necessary, to lessen cache issues */
181 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
182 if ((var) != (val)) \
187 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
189 uint64_t csum_l4 = m_buf->ol_flags & PKT_TX_L4_MASK;
191 if (m_buf->ol_flags & PKT_TX_TCP_SEG)
192 csum_l4 |= PKT_TX_TCP_CKSUM;
195 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
196 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
199 case PKT_TX_TCP_CKSUM:
200 net_hdr->csum_offset = (offsetof(struct tcp_hdr,
203 case PKT_TX_UDP_CKSUM:
204 net_hdr->csum_offset = (offsetof(struct udp_hdr,
207 case PKT_TX_SCTP_CKSUM:
208 net_hdr->csum_offset = (offsetof(struct sctp_hdr,
213 ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
214 ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
215 ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
218 /* IP cksum verification cannot be bypassed, then calculate here */
219 if (m_buf->ol_flags & PKT_TX_IP_CKSUM) {
220 struct ipv4_hdr *ipv4_hdr;
222 ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct ipv4_hdr *,
224 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
227 if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
228 if (m_buf->ol_flags & PKT_TX_IPV4)
229 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
231 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
232 net_hdr->gso_size = m_buf->tso_segsz;
233 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
236 ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
237 ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
238 ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
242 static __rte_always_inline int
243 copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
244 struct vring_desc *descs, struct rte_mbuf *m,
245 uint16_t desc_idx, uint32_t size)
247 uint32_t desc_avail, desc_offset;
248 uint32_t mbuf_avail, mbuf_offset;
250 uint64_t desc_chunck_len;
251 struct vring_desc *desc;
252 uint64_t desc_addr, desc_gaddr;
253 /* A counter to avoid desc dead loop chain */
254 uint16_t nr_desc = 1;
255 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
256 uint16_t copy_nb = vq->batch_copy_nb_elems;
259 desc = &descs[desc_idx];
260 desc_chunck_len = desc->len;
261 desc_gaddr = desc->addr;
262 desc_addr = vhost_iova_to_vva(dev, vq, desc_gaddr,
263 &desc_chunck_len, VHOST_ACCESS_RW);
265 * Checking of 'desc_addr' placed outside of 'unlikely' macro to avoid
266 * performance issue with some versions of gcc (4.8.4 and 5.3.0) which
267 * otherwise stores offset on the stack instead of in a register.
269 if (unlikely(desc->len < dev->vhost_hlen) || !desc_addr) {
274 rte_prefetch0((void *)(uintptr_t)desc_addr);
276 if (likely(desc_chunck_len >= dev->vhost_hlen)) {
277 virtio_enqueue_offload(m,
278 (struct virtio_net_hdr *)(uintptr_t)desc_addr);
279 PRINT_PACKET(dev, (uintptr_t)desc_addr, dev->vhost_hlen, 0);
280 vhost_log_cache_write(dev, vq, desc_gaddr, dev->vhost_hlen);
282 struct virtio_net_hdr vnet_hdr;
283 uint64_t remain = dev->vhost_hlen;
285 uint64_t src = (uint64_t)(uintptr_t)&vnet_hdr, dst;
286 uint64_t guest_addr = desc_gaddr;
288 virtio_enqueue_offload(m, &vnet_hdr);
292 dst = vhost_iova_to_vva(dev, vq, guest_addr,
293 &len, VHOST_ACCESS_RW);
294 if (unlikely(!dst || !len)) {
299 rte_memcpy((void *)(uintptr_t)dst,
300 (void *)(uintptr_t)src, len);
302 PRINT_PACKET(dev, (uintptr_t)dst, (uint32_t)len, 0);
303 vhost_log_cache_write(dev, vq, guest_addr, len);
310 desc_avail = desc->len - dev->vhost_hlen;
311 if (unlikely(desc_chunck_len < dev->vhost_hlen)) {
312 desc_chunck_len = desc_avail;
313 desc_gaddr = desc->addr + dev->vhost_hlen;
314 desc_addr = vhost_iova_to_vva(dev,
318 if (unlikely(!desc_addr)) {
325 desc_offset = dev->vhost_hlen;
326 desc_chunck_len -= dev->vhost_hlen;
329 mbuf_avail = rte_pktmbuf_data_len(m);
331 while (mbuf_avail != 0 || m->next != NULL) {
332 /* done with current mbuf, fetch next */
333 if (mbuf_avail == 0) {
337 mbuf_avail = rte_pktmbuf_data_len(m);
340 /* done with current desc buf, fetch next */
341 if (desc_avail == 0) {
342 if ((desc->flags & VRING_DESC_F_NEXT) == 0) {
343 /* Room in vring buffer is not enough */
347 if (unlikely(desc->next >= size || ++nr_desc > size)) {
352 desc = &descs[desc->next];
353 desc_chunck_len = desc->len;
354 desc_gaddr = desc->addr;
355 desc_addr = vhost_iova_to_vva(dev, vq, desc_gaddr,
358 if (unlikely(!desc_addr)) {
364 desc_avail = desc->len;
365 } else if (unlikely(desc_chunck_len == 0)) {
366 desc_chunck_len = desc_avail;
367 desc_gaddr += desc_offset;
368 desc_addr = vhost_iova_to_vva(dev,
370 &desc_chunck_len, VHOST_ACCESS_RW);
371 if (unlikely(!desc_addr)) {
378 cpy_len = RTE_MIN(desc_chunck_len, mbuf_avail);
379 if (likely(cpy_len > MAX_BATCH_LEN || copy_nb >= vq->size)) {
380 rte_memcpy((void *)((uintptr_t)(desc_addr +
382 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
384 vhost_log_cache_write(dev, vq, desc_gaddr + desc_offset,
386 PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
389 batch_copy[copy_nb].dst =
390 (void *)((uintptr_t)(desc_addr + desc_offset));
391 batch_copy[copy_nb].src =
392 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
393 batch_copy[copy_nb].log_addr = desc_gaddr + desc_offset;
394 batch_copy[copy_nb].len = cpy_len;
398 mbuf_avail -= cpy_len;
399 mbuf_offset += cpy_len;
400 desc_avail -= cpy_len;
401 desc_offset += cpy_len;
402 desc_chunck_len -= cpy_len;
406 vq->batch_copy_nb_elems = copy_nb;
412 * This function adds buffers to the virtio devices RX virtqueue. Buffers can
413 * be received from the physical port or from another virtio device. A packet
414 * count is returned to indicate the number of packets that are successfully
415 * added to the RX queue. This function works when the mbuf is scattered, but
416 * it doesn't support the mergeable feature.
418 static __rte_always_inline uint32_t
419 virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
420 struct rte_mbuf **pkts, uint32_t count)
422 struct vhost_virtqueue *vq;
423 uint16_t avail_idx, free_entries, start_idx;
424 uint16_t desc_indexes[MAX_PKT_BURST];
425 struct vring_desc *descs;
429 LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
430 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
431 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
432 dev->vid, __func__, queue_id);
436 vq = dev->virtqueue[queue_id];
438 rte_spinlock_lock(&vq->access_lock);
440 if (unlikely(vq->enabled == 0))
441 goto out_access_unlock;
443 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
444 vhost_user_iotlb_rd_lock(vq);
446 if (unlikely(vq->access_ok == 0)) {
447 if (unlikely(vring_translate(dev, vq) < 0)) {
453 avail_idx = *((volatile uint16_t *)&vq->avail->idx);
454 start_idx = vq->last_used_idx;
455 free_entries = avail_idx - start_idx;
456 count = RTE_MIN(count, free_entries);
457 count = RTE_MIN(count, (uint32_t)MAX_PKT_BURST);
461 LOG_DEBUG(VHOST_DATA, "(%d) start_idx %d | end_idx %d\n",
462 dev->vid, start_idx, start_idx + count);
464 vq->batch_copy_nb_elems = 0;
466 /* Retrieve all of the desc indexes first to avoid caching issues. */
467 rte_prefetch0(&vq->avail->ring[start_idx & (vq->size - 1)]);
468 for (i = 0; i < count; i++) {
469 used_idx = (start_idx + i) & (vq->size - 1);
470 desc_indexes[i] = vq->avail->ring[used_idx];
471 vq->used->ring[used_idx].id = desc_indexes[i];
472 vq->used->ring[used_idx].len = pkts[i]->pkt_len +
474 vhost_log_cache_used_vring(dev, vq,
475 offsetof(struct vring_used, ring[used_idx]),
476 sizeof(vq->used->ring[used_idx]));
479 rte_prefetch0(&vq->desc[desc_indexes[0]]);
480 for (i = 0; i < count; i++) {
481 struct vring_desc *idesc = NULL;
482 uint16_t desc_idx = desc_indexes[i];
485 if (vq->desc[desc_idx].flags & VRING_DESC_F_INDIRECT) {
486 uint64_t dlen = vq->desc[desc_idx].len;
487 descs = (struct vring_desc *)(uintptr_t)
488 vhost_iova_to_vva(dev,
489 vq, vq->desc[desc_idx].addr,
490 &dlen, VHOST_ACCESS_RO);
491 if (unlikely(!descs)) {
496 if (unlikely(dlen < vq->desc[desc_idx].len)) {
498 * The indirect desc table is not contiguous
499 * in process VA space, we have to copy it.
501 idesc = alloc_copy_ind_table(dev, vq,
502 &vq->desc[desc_idx]);
503 if (unlikely(!idesc))
510 sz = vq->desc[desc_idx].len / sizeof(*descs);
516 err = copy_mbuf_to_desc(dev, vq, descs, pkts[i], desc_idx, sz);
519 free_ind_table(idesc);
524 rte_prefetch0(&vq->desc[desc_indexes[i+1]]);
526 if (unlikely(!!idesc))
527 free_ind_table(idesc);
530 do_data_copy_enqueue(dev, vq);
534 vhost_log_cache_sync(dev, vq);
536 *(volatile uint16_t *)&vq->used->idx += count;
537 vq->last_used_idx += count;
538 vhost_log_used_vring(dev, vq,
539 offsetof(struct vring_used, idx),
540 sizeof(vq->used->idx));
542 /* flush used->idx update before we read avail->flags. */
545 /* Kick the guest if necessary. */
546 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
547 && (vq->callfd >= 0))
548 eventfd_write(vq->callfd, (eventfd_t)1);
550 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
551 vhost_user_iotlb_rd_unlock(vq);
554 rte_spinlock_unlock(&vq->access_lock);
559 static __rte_always_inline int
560 fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq,
561 uint32_t avail_idx, uint32_t *vec_idx,
562 struct buf_vector *buf_vec, uint16_t *desc_chain_head,
563 uint16_t *desc_chain_len)
565 uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
566 uint32_t vec_id = *vec_idx;
569 struct vring_desc *descs = vq->desc;
570 struct vring_desc *idesc = NULL;
572 *desc_chain_head = idx;
574 if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
575 dlen = vq->desc[idx].len;
576 descs = (struct vring_desc *)(uintptr_t)
577 vhost_iova_to_vva(dev, vq, vq->desc[idx].addr,
580 if (unlikely(!descs))
583 if (unlikely(dlen < vq->desc[idx].len)) {
585 * The indirect desc table is not contiguous
586 * in process VA space, we have to copy it.
588 idesc = alloc_copy_ind_table(dev, vq, &vq->desc[idx]);
589 if (unlikely(!idesc))
599 if (unlikely(vec_id >= BUF_VECTOR_MAX || idx >= vq->size)) {
600 free_ind_table(idesc);
604 len += descs[idx].len;
605 buf_vec[vec_id].buf_addr = descs[idx].addr;
606 buf_vec[vec_id].buf_len = descs[idx].len;
607 buf_vec[vec_id].desc_idx = idx;
610 if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
613 idx = descs[idx].next;
616 *desc_chain_len = len;
619 if (unlikely(!!idesc))
620 free_ind_table(idesc);
626 * Returns -1 on fail, 0 on success
629 reserve_avail_buf_mergeable(struct virtio_net *dev, struct vhost_virtqueue *vq,
630 uint32_t size, struct buf_vector *buf_vec,
631 uint16_t *num_buffers, uint16_t avail_head)
634 uint32_t vec_idx = 0;
637 uint16_t head_idx = 0;
641 cur_idx = vq->last_avail_idx;
644 if (unlikely(cur_idx == avail_head))
647 if (unlikely(fill_vec_buf(dev, vq, cur_idx, &vec_idx, buf_vec,
648 &head_idx, &len) < 0))
650 len = RTE_MIN(len, size);
651 update_shadow_used_ring(vq, head_idx, len);
659 * if we tried all available ring items, and still
660 * can't get enough buf, it means something abnormal
663 if (unlikely(tries >= vq->size))
670 static __rte_always_inline int
671 copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct vhost_virtqueue *vq,
672 struct rte_mbuf *m, struct buf_vector *buf_vec,
673 uint16_t num_buffers)
675 uint32_t vec_idx = 0;
676 uint64_t desc_addr, desc_gaddr;
677 uint32_t mbuf_offset, mbuf_avail;
678 uint32_t desc_offset, desc_avail;
680 uint64_t desc_chunck_len;
681 uint64_t hdr_addr, hdr_phys_addr;
682 struct rte_mbuf *hdr_mbuf;
683 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
684 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
685 uint16_t copy_nb = vq->batch_copy_nb_elems;
688 if (unlikely(m == NULL)) {
693 desc_chunck_len = buf_vec[vec_idx].buf_len;
694 desc_gaddr = buf_vec[vec_idx].buf_addr;
695 desc_addr = vhost_iova_to_vva(dev, vq,
699 if (buf_vec[vec_idx].buf_len < dev->vhost_hlen || !desc_addr) {
705 hdr_addr = desc_addr;
706 if (unlikely(desc_chunck_len < dev->vhost_hlen))
709 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
710 hdr_phys_addr = desc_gaddr;
711 rte_prefetch0((void *)(uintptr_t)hdr_addr);
713 LOG_DEBUG(VHOST_DATA, "(%d) RX: num merge buffers %d\n",
714 dev->vid, num_buffers);
716 desc_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
717 if (unlikely(desc_chunck_len < dev->vhost_hlen)) {
718 desc_chunck_len = desc_avail;
719 desc_gaddr += dev->vhost_hlen;
720 desc_addr = vhost_iova_to_vva(dev, vq,
724 if (unlikely(!desc_addr)) {
731 desc_offset = dev->vhost_hlen;
732 desc_chunck_len -= dev->vhost_hlen;
736 mbuf_avail = rte_pktmbuf_data_len(m);
738 while (mbuf_avail != 0 || m->next != NULL) {
739 /* done with current desc buf, get the next one */
740 if (desc_avail == 0) {
742 desc_chunck_len = buf_vec[vec_idx].buf_len;
743 desc_gaddr = buf_vec[vec_idx].buf_addr;
745 vhost_iova_to_vva(dev, vq,
749 if (unlikely(!desc_addr)) {
754 /* Prefetch buffer address. */
755 rte_prefetch0((void *)(uintptr_t)desc_addr);
757 desc_avail = buf_vec[vec_idx].buf_len;
758 } else if (unlikely(desc_chunck_len == 0)) {
759 desc_chunck_len = desc_avail;
760 desc_gaddr += desc_offset;
761 desc_addr = vhost_iova_to_vva(dev, vq,
763 &desc_chunck_len, VHOST_ACCESS_RW);
764 if (unlikely(!desc_addr)) {
771 /* done with current mbuf, get the next one */
772 if (mbuf_avail == 0) {
776 mbuf_avail = rte_pktmbuf_data_len(m);
780 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
781 ASSIGN_UNLESS_EQUAL(hdr->num_buffers, num_buffers);
783 if (unlikely(hdr == &tmp_hdr)) {
785 uint64_t remain = dev->vhost_hlen;
786 uint64_t src = (uint64_t)(uintptr_t)hdr, dst;
787 uint64_t guest_addr = hdr_phys_addr;
791 dst = vhost_iova_to_vva(dev, vq,
794 if (unlikely(!dst || !len)) {
799 rte_memcpy((void *)(uintptr_t)dst,
800 (void *)(uintptr_t)src,
803 PRINT_PACKET(dev, (uintptr_t)dst,
805 vhost_log_cache_write(dev, vq,
813 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
815 vhost_log_cache_write(dev, vq, hdr_phys_addr,
822 cpy_len = RTE_MIN(desc_chunck_len, mbuf_avail);
824 if (likely(cpy_len > MAX_BATCH_LEN || copy_nb >= vq->size)) {
825 rte_memcpy((void *)((uintptr_t)(desc_addr +
827 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
829 vhost_log_cache_write(dev, vq, desc_gaddr + desc_offset,
831 PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
834 batch_copy[copy_nb].dst =
835 (void *)((uintptr_t)(desc_addr + desc_offset));
836 batch_copy[copy_nb].src =
837 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
838 batch_copy[copy_nb].log_addr = desc_gaddr + desc_offset;
839 batch_copy[copy_nb].len = cpy_len;
843 mbuf_avail -= cpy_len;
844 mbuf_offset += cpy_len;
845 desc_avail -= cpy_len;
846 desc_offset += cpy_len;
847 desc_chunck_len -= cpy_len;
851 vq->batch_copy_nb_elems = copy_nb;
856 static __rte_always_inline uint32_t
857 virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
858 struct rte_mbuf **pkts, uint32_t count)
860 struct vhost_virtqueue *vq;
861 uint32_t pkt_idx = 0;
862 uint16_t num_buffers;
863 struct buf_vector buf_vec[BUF_VECTOR_MAX];
866 LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
867 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
868 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
869 dev->vid, __func__, queue_id);
873 vq = dev->virtqueue[queue_id];
875 rte_spinlock_lock(&vq->access_lock);
877 if (unlikely(vq->enabled == 0))
878 goto out_access_unlock;
880 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
881 vhost_user_iotlb_rd_lock(vq);
883 if (unlikely(vq->access_ok == 0))
884 if (unlikely(vring_translate(dev, vq) < 0))
887 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
891 vq->batch_copy_nb_elems = 0;
893 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
895 vq->shadow_used_idx = 0;
896 avail_head = *((volatile uint16_t *)&vq->avail->idx);
897 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
898 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
900 if (unlikely(reserve_avail_buf_mergeable(dev, vq,
901 pkt_len, buf_vec, &num_buffers,
903 LOG_DEBUG(VHOST_DATA,
904 "(%d) failed to get enough desc from vring\n",
906 vq->shadow_used_idx -= num_buffers;
910 LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n",
911 dev->vid, vq->last_avail_idx,
912 vq->last_avail_idx + num_buffers);
914 if (copy_mbuf_to_desc_mergeable(dev, vq, pkts[pkt_idx],
915 buf_vec, num_buffers) < 0) {
916 vq->shadow_used_idx -= num_buffers;
920 vq->last_avail_idx += num_buffers;
923 do_data_copy_enqueue(dev, vq);
925 if (likely(vq->shadow_used_idx)) {
926 flush_shadow_used_ring(dev, vq);
928 /* flush used->idx update before we read avail->flags. */
931 /* Kick the guest if necessary. */
932 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
933 && (vq->callfd >= 0))
934 eventfd_write(vq->callfd, (eventfd_t)1);
938 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
939 vhost_user_iotlb_rd_unlock(vq);
942 rte_spinlock_unlock(&vq->access_lock);
948 rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
949 struct rte_mbuf **pkts, uint16_t count)
951 struct virtio_net *dev = get_device(vid);
956 if (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF))
957 return virtio_dev_merge_rx(dev, queue_id, pkts, count);
959 return virtio_dev_rx(dev, queue_id, pkts, count);
963 virtio_net_with_host_offload(struct virtio_net *dev)
966 ((1ULL << VIRTIO_NET_F_CSUM) |
967 (1ULL << VIRTIO_NET_F_HOST_ECN) |
968 (1ULL << VIRTIO_NET_F_HOST_TSO4) |
969 (1ULL << VIRTIO_NET_F_HOST_TSO6) |
970 (1ULL << VIRTIO_NET_F_HOST_UFO)))
977 parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
979 struct ipv4_hdr *ipv4_hdr;
980 struct ipv6_hdr *ipv6_hdr;
982 struct ether_hdr *eth_hdr;
985 eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
987 m->l2_len = sizeof(struct ether_hdr);
988 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
990 if (ethertype == ETHER_TYPE_VLAN) {
991 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
993 m->l2_len += sizeof(struct vlan_hdr);
994 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
997 l3_hdr = (char *)eth_hdr + m->l2_len;
1000 case ETHER_TYPE_IPv4:
1002 *l4_proto = ipv4_hdr->next_proto_id;
1003 m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
1004 *l4_hdr = (char *)l3_hdr + m->l3_len;
1005 m->ol_flags |= PKT_TX_IPV4;
1007 case ETHER_TYPE_IPv6:
1009 *l4_proto = ipv6_hdr->proto;
1010 m->l3_len = sizeof(struct ipv6_hdr);
1011 *l4_hdr = (char *)l3_hdr + m->l3_len;
1012 m->ol_flags |= PKT_TX_IPV6;
1022 static __rte_always_inline void
1023 vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
1025 uint16_t l4_proto = 0;
1026 void *l4_hdr = NULL;
1027 struct tcp_hdr *tcp_hdr = NULL;
1029 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1032 parse_ethernet(m, &l4_proto, &l4_hdr);
1033 if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1034 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
1035 switch (hdr->csum_offset) {
1036 case (offsetof(struct tcp_hdr, cksum)):
1037 if (l4_proto == IPPROTO_TCP)
1038 m->ol_flags |= PKT_TX_TCP_CKSUM;
1040 case (offsetof(struct udp_hdr, dgram_cksum)):
1041 if (l4_proto == IPPROTO_UDP)
1042 m->ol_flags |= PKT_TX_UDP_CKSUM;
1044 case (offsetof(struct sctp_hdr, cksum)):
1045 if (l4_proto == IPPROTO_SCTP)
1046 m->ol_flags |= PKT_TX_SCTP_CKSUM;
1054 if (l4_hdr && hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1055 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1056 case VIRTIO_NET_HDR_GSO_TCPV4:
1057 case VIRTIO_NET_HDR_GSO_TCPV6:
1059 m->ol_flags |= PKT_TX_TCP_SEG;
1060 m->tso_segsz = hdr->gso_size;
1061 m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
1064 RTE_LOG(WARNING, VHOST_DATA,
1065 "unsupported gso type %u.\n", hdr->gso_type);
1071 #define RARP_PKT_SIZE 64
1074 make_rarp_packet(struct rte_mbuf *rarp_mbuf, const struct ether_addr *mac)
1076 struct ether_hdr *eth_hdr;
1077 struct arp_hdr *rarp;
1079 if (rarp_mbuf->buf_len < 64) {
1080 RTE_LOG(WARNING, VHOST_DATA,
1081 "failed to make RARP; mbuf size too small %u (< %d)\n",
1082 rarp_mbuf->buf_len, RARP_PKT_SIZE);
1086 /* Ethernet header. */
1087 eth_hdr = rte_pktmbuf_mtod_offset(rarp_mbuf, struct ether_hdr *, 0);
1088 memset(eth_hdr->d_addr.addr_bytes, 0xff, ETHER_ADDR_LEN);
1089 ether_addr_copy(mac, ð_hdr->s_addr);
1090 eth_hdr->ether_type = htons(ETHER_TYPE_RARP);
1093 rarp = (struct arp_hdr *)(eth_hdr + 1);
1094 rarp->arp_hrd = htons(ARP_HRD_ETHER);
1095 rarp->arp_pro = htons(ETHER_TYPE_IPv4);
1096 rarp->arp_hln = ETHER_ADDR_LEN;
1098 rarp->arp_op = htons(ARP_OP_REVREQUEST);
1100 ether_addr_copy(mac, &rarp->arp_data.arp_sha);
1101 ether_addr_copy(mac, &rarp->arp_data.arp_tha);
1102 memset(&rarp->arp_data.arp_sip, 0x00, 4);
1103 memset(&rarp->arp_data.arp_tip, 0x00, 4);
1105 rarp_mbuf->pkt_len = rarp_mbuf->data_len = RARP_PKT_SIZE;
1110 static __rte_always_inline void
1111 put_zmbuf(struct zcopy_mbuf *zmbuf)
1116 static __rte_always_inline int
1117 copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
1118 struct vring_desc *descs, uint16_t max_desc,
1119 struct rte_mbuf *m, uint16_t desc_idx,
1120 struct rte_mempool *mbuf_pool)
1122 struct vring_desc *desc;
1123 uint64_t desc_addr, desc_gaddr;
1124 uint32_t desc_avail, desc_offset;
1125 uint32_t mbuf_avail, mbuf_offset;
1127 uint64_t desc_chunck_len;
1128 struct rte_mbuf *cur = m, *prev = m;
1129 struct virtio_net_hdr tmp_hdr;
1130 struct virtio_net_hdr *hdr = NULL;
1131 /* A counter to avoid desc dead loop chain */
1132 uint32_t nr_desc = 1;
1133 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
1134 uint16_t copy_nb = vq->batch_copy_nb_elems;
1137 desc = &descs[desc_idx];
1138 if (unlikely((desc->len < dev->vhost_hlen)) ||
1139 (desc->flags & VRING_DESC_F_INDIRECT)) {
1144 desc_chunck_len = desc->len;
1145 desc_gaddr = desc->addr;
1146 desc_addr = vhost_iova_to_vva(dev,
1150 if (unlikely(!desc_addr)) {
1155 if (virtio_net_with_host_offload(dev)) {
1156 if (unlikely(desc_chunck_len < sizeof(struct virtio_net_hdr))) {
1157 uint64_t len = desc_chunck_len;
1158 uint64_t remain = sizeof(struct virtio_net_hdr);
1159 uint64_t src = desc_addr;
1160 uint64_t dst = (uint64_t)(uintptr_t)&tmp_hdr;
1161 uint64_t guest_addr = desc_gaddr;
1164 * No luck, the virtio-net header doesn't fit
1165 * in a contiguous virtual area.
1169 src = vhost_iova_to_vva(dev, vq,
1172 if (unlikely(!src || !len)) {
1177 rte_memcpy((void *)(uintptr_t)dst,
1178 (void *)(uintptr_t)src, len);
1187 hdr = (struct virtio_net_hdr *)((uintptr_t)desc_addr);
1193 * A virtio driver normally uses at least 2 desc buffers
1194 * for Tx: the first for storing the header, and others
1195 * for storing the data.
1197 if (likely((desc->len == dev->vhost_hlen) &&
1198 (desc->flags & VRING_DESC_F_NEXT) != 0)) {
1199 desc = &descs[desc->next];
1200 if (unlikely(desc->flags & VRING_DESC_F_INDIRECT)) {
1205 desc_chunck_len = desc->len;
1206 desc_gaddr = desc->addr;
1207 desc_addr = vhost_iova_to_vva(dev,
1211 if (unlikely(!desc_addr)) {
1217 desc_avail = desc->len;
1220 desc_avail = desc->len - dev->vhost_hlen;
1222 if (unlikely(desc_chunck_len < dev->vhost_hlen)) {
1223 desc_chunck_len = desc_avail;
1224 desc_gaddr += dev->vhost_hlen;
1225 desc_addr = vhost_iova_to_vva(dev,
1229 if (unlikely(!desc_addr)) {
1236 desc_offset = dev->vhost_hlen;
1237 desc_chunck_len -= dev->vhost_hlen;
1241 rte_prefetch0((void *)(uintptr_t)(desc_addr + desc_offset));
1243 PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
1244 (uint32_t)desc_chunck_len, 0);
1247 mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
1251 cpy_len = RTE_MIN(desc_chunck_len, mbuf_avail);
1254 * A desc buf might across two host physical pages that are
1255 * not continuous. In such case (gpa_to_hpa returns 0), data
1256 * will be copied even though zero copy is enabled.
1258 if (unlikely(dev->dequeue_zero_copy && (hpa = gpa_to_hpa(dev,
1259 desc_gaddr + desc_offset, cpy_len)))) {
1260 cur->data_len = cpy_len;
1262 cur->buf_addr = (void *)(uintptr_t)(desc_addr
1264 cur->buf_iova = hpa;
1267 * In zero copy mode, one mbuf can only reference data
1268 * for one or partial of one desc buff.
1270 mbuf_avail = cpy_len;
1272 if (likely(cpy_len > MAX_BATCH_LEN ||
1273 copy_nb >= vq->size ||
1274 (hdr && cur == m) ||
1275 desc->len != desc_chunck_len)) {
1276 rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
1278 (void *)((uintptr_t)(desc_addr +
1282 batch_copy[copy_nb].dst =
1283 rte_pktmbuf_mtod_offset(cur, void *,
1285 batch_copy[copy_nb].src =
1286 (void *)((uintptr_t)(desc_addr +
1288 batch_copy[copy_nb].len = cpy_len;
1293 mbuf_avail -= cpy_len;
1294 mbuf_offset += cpy_len;
1295 desc_avail -= cpy_len;
1296 desc_chunck_len -= cpy_len;
1297 desc_offset += cpy_len;
1299 /* This desc reaches to its end, get the next one */
1300 if (desc_avail == 0) {
1301 if ((desc->flags & VRING_DESC_F_NEXT) == 0)
1304 if (unlikely(desc->next >= max_desc ||
1305 ++nr_desc > max_desc)) {
1309 desc = &descs[desc->next];
1310 if (unlikely(desc->flags & VRING_DESC_F_INDIRECT)) {
1315 desc_chunck_len = desc->len;
1316 desc_gaddr = desc->addr;
1317 desc_addr = vhost_iova_to_vva(dev,
1321 if (unlikely(!desc_addr)) {
1326 rte_prefetch0((void *)(uintptr_t)desc_addr);
1329 desc_avail = desc->len;
1331 PRINT_PACKET(dev, (uintptr_t)desc_addr,
1332 (uint32_t)desc_chunck_len, 0);
1333 } else if (unlikely(desc_chunck_len == 0)) {
1334 desc_chunck_len = desc_avail;
1335 desc_gaddr += desc_offset;
1336 desc_addr = vhost_iova_to_vva(dev, vq,
1340 if (unlikely(!desc_addr)) {
1346 PRINT_PACKET(dev, (uintptr_t)desc_addr,
1347 (uint32_t)desc_chunck_len, 0);
1351 * This mbuf reaches to its end, get a new one
1352 * to hold more data.
1354 if (mbuf_avail == 0) {
1355 cur = rte_pktmbuf_alloc(mbuf_pool);
1356 if (unlikely(cur == NULL)) {
1357 RTE_LOG(ERR, VHOST_DATA, "Failed to "
1358 "allocate memory for mbuf.\n");
1362 if (unlikely(dev->dequeue_zero_copy))
1363 rte_mbuf_refcnt_update(cur, 1);
1366 prev->data_len = mbuf_offset;
1368 m->pkt_len += mbuf_offset;
1372 mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
1376 prev->data_len = mbuf_offset;
1377 m->pkt_len += mbuf_offset;
1380 vhost_dequeue_offload(hdr, m);
1383 vq->batch_copy_nb_elems = copy_nb;
1388 static __rte_always_inline void
1389 update_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq,
1390 uint32_t used_idx, uint32_t desc_idx)
1392 vq->used->ring[used_idx].id = desc_idx;
1393 vq->used->ring[used_idx].len = 0;
1394 vhost_log_cache_used_vring(dev, vq,
1395 offsetof(struct vring_used, ring[used_idx]),
1396 sizeof(vq->used->ring[used_idx]));
1399 static __rte_always_inline void
1400 update_used_idx(struct virtio_net *dev, struct vhost_virtqueue *vq,
1403 if (unlikely(count == 0))
1409 vhost_log_cache_sync(dev, vq);
1411 vq->used->idx += count;
1412 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
1413 sizeof(vq->used->idx));
1415 /* Kick guest if required. */
1416 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
1417 && (vq->callfd >= 0))
1418 eventfd_write(vq->callfd, (eventfd_t)1);
1421 static __rte_always_inline struct zcopy_mbuf *
1422 get_zmbuf(struct vhost_virtqueue *vq)
1428 /* search [last_zmbuf_idx, zmbuf_size) */
1429 i = vq->last_zmbuf_idx;
1430 last = vq->zmbuf_size;
1433 for (; i < last; i++) {
1434 if (vq->zmbufs[i].in_use == 0) {
1435 vq->last_zmbuf_idx = i + 1;
1436 vq->zmbufs[i].in_use = 1;
1437 return &vq->zmbufs[i];
1443 /* search [0, last_zmbuf_idx) */
1445 last = vq->last_zmbuf_idx;
1452 static __rte_always_inline bool
1453 mbuf_is_consumed(struct rte_mbuf *m)
1456 if (rte_mbuf_refcnt_read(m) > 1)
1464 static __rte_always_inline void
1465 restore_mbuf(struct rte_mbuf *m)
1467 uint32_t mbuf_size, priv_size;
1470 priv_size = rte_pktmbuf_priv_size(m->pool);
1471 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
1472 /* start of buffer is after mbuf structure and priv data */
1474 m->buf_addr = (char *)m + mbuf_size;
1475 m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
1481 rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
1482 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
1484 struct virtio_net *dev;
1485 struct rte_mbuf *rarp_mbuf = NULL;
1486 struct vhost_virtqueue *vq;
1487 uint32_t desc_indexes[MAX_PKT_BURST];
1490 uint16_t free_entries;
1493 dev = get_device(vid);
1497 if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
1498 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
1499 dev->vid, __func__, queue_id);
1503 vq = dev->virtqueue[queue_id];
1505 if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0))
1508 if (unlikely(vq->enabled == 0))
1509 goto out_access_unlock;
1511 vq->batch_copy_nb_elems = 0;
1513 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1514 vhost_user_iotlb_rd_lock(vq);
1516 if (unlikely(vq->access_ok == 0))
1517 if (unlikely(vring_translate(dev, vq) < 0))
1520 if (unlikely(dev->dequeue_zero_copy)) {
1521 struct zcopy_mbuf *zmbuf, *next;
1524 for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
1525 zmbuf != NULL; zmbuf = next) {
1526 next = TAILQ_NEXT(zmbuf, next);
1528 if (mbuf_is_consumed(zmbuf->mbuf)) {
1529 used_idx = vq->last_used_idx++ & (vq->size - 1);
1530 update_used_ring(dev, vq, used_idx,
1534 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
1535 restore_mbuf(zmbuf->mbuf);
1536 rte_pktmbuf_free(zmbuf->mbuf);
1542 update_used_idx(dev, vq, nr_updated);
1546 * Construct a RARP broadcast packet, and inject it to the "pkts"
1547 * array, to looks like that guest actually send such packet.
1549 * Check user_send_rarp() for more information.
1551 * broadcast_rarp shares a cacheline in the virtio_net structure
1552 * with some fields that are accessed during enqueue and
1553 * rte_atomic16_cmpset() causes a write if using cmpxchg. This could
1554 * result in false sharing between enqueue and dequeue.
1556 * Prevent unnecessary false sharing by reading broadcast_rarp first
1557 * and only performing cmpset if the read indicates it is likely to
1561 if (unlikely(rte_atomic16_read(&dev->broadcast_rarp) &&
1562 rte_atomic16_cmpset((volatile uint16_t *)
1563 &dev->broadcast_rarp.cnt, 1, 0))) {
1565 rarp_mbuf = rte_pktmbuf_alloc(mbuf_pool);
1566 if (rarp_mbuf == NULL) {
1567 RTE_LOG(ERR, VHOST_DATA,
1568 "Failed to allocate memory for mbuf.\n");
1572 if (make_rarp_packet(rarp_mbuf, &dev->mac)) {
1573 rte_pktmbuf_free(rarp_mbuf);
1580 free_entries = *((volatile uint16_t *)&vq->avail->idx) -
1582 if (free_entries == 0)
1585 LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
1587 /* Prefetch available and used ring */
1588 avail_idx = vq->last_avail_idx & (vq->size - 1);
1589 used_idx = vq->last_used_idx & (vq->size - 1);
1590 rte_prefetch0(&vq->avail->ring[avail_idx]);
1591 rte_prefetch0(&vq->used->ring[used_idx]);
1593 count = RTE_MIN(count, MAX_PKT_BURST);
1594 count = RTE_MIN(count, free_entries);
1595 LOG_DEBUG(VHOST_DATA, "(%d) about to dequeue %u buffers\n",
1598 /* Retrieve all of the head indexes first to avoid caching issues. */
1599 for (i = 0; i < count; i++) {
1600 avail_idx = (vq->last_avail_idx + i) & (vq->size - 1);
1601 used_idx = (vq->last_used_idx + i) & (vq->size - 1);
1602 desc_indexes[i] = vq->avail->ring[avail_idx];
1604 if (likely(dev->dequeue_zero_copy == 0))
1605 update_used_ring(dev, vq, used_idx, desc_indexes[i]);
1608 /* Prefetch descriptor index. */
1609 rte_prefetch0(&vq->desc[desc_indexes[0]]);
1610 for (i = 0; i < count; i++) {
1611 struct vring_desc *desc, *idesc = NULL;
1616 if (likely(i + 1 < count))
1617 rte_prefetch0(&vq->desc[desc_indexes[i + 1]]);
1619 if (vq->desc[desc_indexes[i]].flags & VRING_DESC_F_INDIRECT) {
1620 dlen = vq->desc[desc_indexes[i]].len;
1621 desc = (struct vring_desc *)(uintptr_t)
1622 vhost_iova_to_vva(dev, vq,
1623 vq->desc[desc_indexes[i]].addr,
1626 if (unlikely(!desc))
1629 if (unlikely(dlen < vq->desc[desc_indexes[i]].len)) {
1631 * The indirect desc table is not contiguous
1632 * in process VA space, we have to copy it.
1634 idesc = alloc_copy_ind_table(dev, vq,
1635 &vq->desc[desc_indexes[i]]);
1636 if (unlikely(!idesc))
1642 rte_prefetch0(desc);
1643 sz = vq->desc[desc_indexes[i]].len / sizeof(*desc);
1648 idx = desc_indexes[i];
1651 pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
1652 if (unlikely(pkts[i] == NULL)) {
1653 RTE_LOG(ERR, VHOST_DATA,
1654 "Failed to allocate memory for mbuf.\n");
1655 free_ind_table(idesc);
1659 err = copy_desc_to_mbuf(dev, vq, desc, sz, pkts[i], idx,
1661 if (unlikely(err)) {
1662 rte_pktmbuf_free(pkts[i]);
1663 free_ind_table(idesc);
1667 if (unlikely(dev->dequeue_zero_copy)) {
1668 struct zcopy_mbuf *zmbuf;
1670 zmbuf = get_zmbuf(vq);
1672 rte_pktmbuf_free(pkts[i]);
1673 free_ind_table(idesc);
1676 zmbuf->mbuf = pkts[i];
1677 zmbuf->desc_idx = desc_indexes[i];
1680 * Pin lock the mbuf; we will check later to see
1681 * whether the mbuf is freed (when we are the last
1682 * user) or not. If that's the case, we then could
1683 * update the used ring safely.
1685 rte_mbuf_refcnt_update(pkts[i], 1);
1688 TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next);
1691 if (unlikely(!!idesc))
1692 free_ind_table(idesc);
1694 vq->last_avail_idx += i;
1696 if (likely(dev->dequeue_zero_copy == 0)) {
1697 do_data_copy_dequeue(vq);
1698 vq->last_used_idx += i;
1699 update_used_idx(dev, vq, i);
1703 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1704 vhost_user_iotlb_rd_unlock(vq);
1707 rte_spinlock_unlock(&vq->access_lock);
1709 if (unlikely(rarp_mbuf != NULL)) {
1711 * Inject it to the head of "pkts" array, so that switch's mac
1712 * learning table will get updated first.
1714 memmove(&pkts[1], pkts, i * sizeof(struct rte_mbuf *));
1715 pkts[0] = rarp_mbuf;