4 * Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
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
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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_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 *(volatile uint16_t *)&vq->used->idx += vq->shadow_used_idx;
139 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
140 sizeof(vq->used->idx));
143 static __rte_always_inline void
144 update_shadow_used_ring(struct vhost_virtqueue *vq,
145 uint16_t desc_idx, uint16_t len)
147 uint16_t i = vq->shadow_used_idx++;
149 vq->shadow_used_ring[i].id = desc_idx;
150 vq->shadow_used_ring[i].len = len;
154 do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq)
156 struct batch_copy_elem *elem = vq->batch_copy_elems;
157 uint16_t count = vq->batch_copy_nb_elems;
160 for (i = 0; i < count; i++) {
161 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
162 vhost_log_write(dev, elem[i].log_addr, elem[i].len);
163 PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0);
168 do_data_copy_dequeue(struct vhost_virtqueue *vq)
170 struct batch_copy_elem *elem = vq->batch_copy_elems;
171 uint16_t count = vq->batch_copy_nb_elems;
174 for (i = 0; i < count; i++)
175 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
178 /* avoid write operation when necessary, to lessen cache issues */
179 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
180 if ((var) != (val)) \
185 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
187 uint64_t csum_l4 = m_buf->ol_flags & PKT_TX_L4_MASK;
189 if (m_buf->ol_flags & PKT_TX_TCP_SEG)
190 csum_l4 |= PKT_TX_TCP_CKSUM;
193 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
194 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
197 case PKT_TX_TCP_CKSUM:
198 net_hdr->csum_offset = (offsetof(struct tcp_hdr,
201 case PKT_TX_UDP_CKSUM:
202 net_hdr->csum_offset = (offsetof(struct udp_hdr,
205 case PKT_TX_SCTP_CKSUM:
206 net_hdr->csum_offset = (offsetof(struct sctp_hdr,
211 ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
212 ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
213 ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
216 /* IP cksum verification cannot be bypassed, then calculate here */
217 if (m_buf->ol_flags & PKT_TX_IP_CKSUM) {
218 struct ipv4_hdr *ipv4_hdr;
220 ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct ipv4_hdr *,
222 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
225 if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
226 if (m_buf->ol_flags & PKT_TX_IPV4)
227 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
229 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
230 net_hdr->gso_size = m_buf->tso_segsz;
231 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
234 ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
235 ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
236 ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
240 static __rte_always_inline int
241 copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
242 struct vring_desc *descs, struct rte_mbuf *m,
243 uint16_t desc_idx, uint32_t size)
245 uint32_t desc_avail, desc_offset;
246 uint32_t mbuf_avail, mbuf_offset;
248 uint64_t desc_chunck_len;
249 struct vring_desc *desc;
250 uint64_t desc_addr, desc_gaddr;
251 /* A counter to avoid desc dead loop chain */
252 uint16_t nr_desc = 1;
253 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
254 uint16_t copy_nb = vq->batch_copy_nb_elems;
257 desc = &descs[desc_idx];
258 desc_chunck_len = desc->len;
259 desc_gaddr = desc->addr;
260 desc_addr = vhost_iova_to_vva(dev, vq, desc_gaddr,
261 &desc_chunck_len, VHOST_ACCESS_RW);
263 * Checking of 'desc_addr' placed outside of 'unlikely' macro to avoid
264 * performance issue with some versions of gcc (4.8.4 and 5.3.0) which
265 * otherwise stores offset on the stack instead of in a register.
267 if (unlikely(desc->len < dev->vhost_hlen) || !desc_addr) {
272 rte_prefetch0((void *)(uintptr_t)desc_addr);
274 if (likely(desc_chunck_len >= dev->vhost_hlen)) {
275 virtio_enqueue_offload(m,
276 (struct virtio_net_hdr *)(uintptr_t)desc_addr);
277 PRINT_PACKET(dev, (uintptr_t)desc_addr, dev->vhost_hlen, 0);
278 vhost_log_write(dev, desc_gaddr, dev->vhost_hlen);
280 struct virtio_net_hdr vnet_hdr;
281 uint64_t remain = dev->vhost_hlen;
283 uint64_t src = (uint64_t)(uintptr_t)&vnet_hdr, dst;
284 uint64_t guest_addr = desc_gaddr;
286 virtio_enqueue_offload(m, &vnet_hdr);
290 dst = vhost_iova_to_vva(dev, vq, guest_addr,
291 &len, VHOST_ACCESS_RW);
292 if (unlikely(!dst || !len)) {
297 rte_memcpy((void *)(uintptr_t)dst,
298 (void *)(uintptr_t)src, len);
300 PRINT_PACKET(dev, (uintptr_t)dst, (uint32_t)len, 0);
301 vhost_log_write(dev, guest_addr, len);
308 desc_avail = desc->len - dev->vhost_hlen;
309 if (unlikely(desc_chunck_len < dev->vhost_hlen)) {
310 desc_chunck_len = desc_avail;
311 desc_gaddr = desc->addr + dev->vhost_hlen;
312 desc_addr = vhost_iova_to_vva(dev,
316 if (unlikely(!desc_addr)) {
323 desc_offset = dev->vhost_hlen;
324 desc_chunck_len -= dev->vhost_hlen;
327 mbuf_avail = rte_pktmbuf_data_len(m);
329 while (mbuf_avail != 0 || m->next != NULL) {
330 /* done with current mbuf, fetch next */
331 if (mbuf_avail == 0) {
335 mbuf_avail = rte_pktmbuf_data_len(m);
338 /* done with current desc buf, fetch next */
339 if (desc_avail == 0) {
340 if ((desc->flags & VRING_DESC_F_NEXT) == 0) {
341 /* Room in vring buffer is not enough */
345 if (unlikely(desc->next >= size || ++nr_desc > size)) {
350 desc = &descs[desc->next];
351 desc_chunck_len = desc->len;
352 desc_gaddr = desc->addr;
353 desc_addr = vhost_iova_to_vva(dev, vq, desc_gaddr,
356 if (unlikely(!desc_addr)) {
362 desc_avail = desc->len;
363 } else if (unlikely(desc_chunck_len == 0)) {
364 desc_chunck_len = desc_avail;
365 desc_gaddr += desc_offset;
366 desc_addr = vhost_iova_to_vva(dev,
368 &desc_chunck_len, VHOST_ACCESS_RW);
369 if (unlikely(!desc_addr)) {
376 cpy_len = RTE_MIN(desc_chunck_len, mbuf_avail);
377 if (likely(cpy_len > MAX_BATCH_LEN || copy_nb >= vq->size)) {
378 rte_memcpy((void *)((uintptr_t)(desc_addr +
380 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
382 vhost_log_write(dev, desc_gaddr + desc_offset, cpy_len);
383 PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
386 batch_copy[copy_nb].dst =
387 (void *)((uintptr_t)(desc_addr + desc_offset));
388 batch_copy[copy_nb].src =
389 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
390 batch_copy[copy_nb].log_addr = desc_gaddr + desc_offset;
391 batch_copy[copy_nb].len = cpy_len;
395 mbuf_avail -= cpy_len;
396 mbuf_offset += cpy_len;
397 desc_avail -= cpy_len;
398 desc_offset += cpy_len;
399 desc_chunck_len -= cpy_len;
403 vq->batch_copy_nb_elems = copy_nb;
409 * This function adds buffers to the virtio devices RX virtqueue. Buffers can
410 * be received from the physical port or from another virtio device. A packet
411 * count is returned to indicate the number of packets that are successfully
412 * added to the RX queue. This function works when the mbuf is scattered, but
413 * it doesn't support the mergeable feature.
415 static __rte_always_inline uint32_t
416 virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
417 struct rte_mbuf **pkts, uint32_t count)
419 struct vhost_virtqueue *vq;
420 uint16_t avail_idx, free_entries, start_idx;
421 uint16_t desc_indexes[MAX_PKT_BURST];
422 struct vring_desc *descs;
426 LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
427 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
428 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
429 dev->vid, __func__, queue_id);
433 vq = dev->virtqueue[queue_id];
435 rte_spinlock_lock(&vq->access_lock);
437 if (unlikely(vq->enabled == 0))
438 goto out_access_unlock;
440 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
441 vhost_user_iotlb_rd_lock(vq);
443 if (unlikely(vq->access_ok == 0)) {
444 if (unlikely(vring_translate(dev, vq) < 0)) {
450 avail_idx = *((volatile uint16_t *)&vq->avail->idx);
451 start_idx = vq->last_used_idx;
452 free_entries = avail_idx - start_idx;
453 count = RTE_MIN(count, free_entries);
454 count = RTE_MIN(count, (uint32_t)MAX_PKT_BURST);
458 LOG_DEBUG(VHOST_DATA, "(%d) start_idx %d | end_idx %d\n",
459 dev->vid, start_idx, start_idx + count);
461 vq->batch_copy_nb_elems = 0;
463 /* Retrieve all of the desc indexes first to avoid caching issues. */
464 rte_prefetch0(&vq->avail->ring[start_idx & (vq->size - 1)]);
465 for (i = 0; i < count; i++) {
466 used_idx = (start_idx + i) & (vq->size - 1);
467 desc_indexes[i] = vq->avail->ring[used_idx];
468 vq->used->ring[used_idx].id = desc_indexes[i];
469 vq->used->ring[used_idx].len = pkts[i]->pkt_len +
471 vhost_log_used_vring(dev, vq,
472 offsetof(struct vring_used, ring[used_idx]),
473 sizeof(vq->used->ring[used_idx]));
476 rte_prefetch0(&vq->desc[desc_indexes[0]]);
477 for (i = 0; i < count; i++) {
478 struct vring_desc *idesc = NULL;
479 uint16_t desc_idx = desc_indexes[i];
482 if (vq->desc[desc_idx].flags & VRING_DESC_F_INDIRECT) {
483 uint64_t dlen = vq->desc[desc_idx].len;
484 descs = (struct vring_desc *)(uintptr_t)
485 vhost_iova_to_vva(dev,
486 vq, vq->desc[desc_idx].addr,
487 &dlen, VHOST_ACCESS_RO);
488 if (unlikely(!descs)) {
493 if (unlikely(dlen < vq->desc[desc_idx].len)) {
495 * The indirect desc table is not contiguous
496 * in process VA space, we have to copy it.
498 idesc = alloc_copy_ind_table(dev, vq,
499 &vq->desc[desc_idx]);
500 if (unlikely(!idesc))
507 sz = vq->desc[desc_idx].len / sizeof(*descs);
513 err = copy_mbuf_to_desc(dev, vq, descs, pkts[i], desc_idx, sz);
516 free_ind_table(idesc);
521 rte_prefetch0(&vq->desc[desc_indexes[i+1]]);
523 if (unlikely(!!idesc))
524 free_ind_table(idesc);
527 do_data_copy_enqueue(dev, vq);
531 *(volatile uint16_t *)&vq->used->idx += count;
532 vq->last_used_idx += count;
533 vhost_log_used_vring(dev, vq,
534 offsetof(struct vring_used, idx),
535 sizeof(vq->used->idx));
537 /* flush used->idx update before we read avail->flags. */
540 /* Kick the guest if necessary. */
541 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
542 && (vq->callfd >= 0))
543 eventfd_write(vq->callfd, (eventfd_t)1);
545 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
546 vhost_user_iotlb_rd_unlock(vq);
549 rte_spinlock_unlock(&vq->access_lock);
554 static __rte_always_inline int
555 fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq,
556 uint32_t avail_idx, uint32_t *vec_idx,
557 struct buf_vector *buf_vec, uint16_t *desc_chain_head,
558 uint16_t *desc_chain_len)
560 uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
561 uint32_t vec_id = *vec_idx;
564 struct vring_desc *descs = vq->desc;
565 struct vring_desc *idesc = NULL;
567 *desc_chain_head = idx;
569 if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
570 dlen = vq->desc[idx].len;
571 descs = (struct vring_desc *)(uintptr_t)
572 vhost_iova_to_vva(dev, vq, vq->desc[idx].addr,
575 if (unlikely(!descs))
578 if (unlikely(dlen < vq->desc[idx].len)) {
580 * The indirect desc table is not contiguous
581 * in process VA space, we have to copy it.
583 idesc = alloc_copy_ind_table(dev, vq, &vq->desc[idx]);
584 if (unlikely(!idesc))
594 if (unlikely(vec_id >= BUF_VECTOR_MAX || idx >= vq->size)) {
595 free_ind_table(idesc);
599 len += descs[idx].len;
600 buf_vec[vec_id].buf_addr = descs[idx].addr;
601 buf_vec[vec_id].buf_len = descs[idx].len;
602 buf_vec[vec_id].desc_idx = idx;
605 if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
608 idx = descs[idx].next;
611 *desc_chain_len = len;
614 if (unlikely(!!idesc))
615 free_ind_table(idesc);
621 * Returns -1 on fail, 0 on success
624 reserve_avail_buf_mergeable(struct virtio_net *dev, struct vhost_virtqueue *vq,
625 uint32_t size, struct buf_vector *buf_vec,
626 uint16_t *num_buffers, uint16_t avail_head)
629 uint32_t vec_idx = 0;
632 uint16_t head_idx = 0;
636 cur_idx = vq->last_avail_idx;
639 if (unlikely(cur_idx == avail_head))
642 if (unlikely(fill_vec_buf(dev, vq, cur_idx, &vec_idx, buf_vec,
643 &head_idx, &len) < 0))
645 len = RTE_MIN(len, size);
646 update_shadow_used_ring(vq, head_idx, len);
654 * if we tried all available ring items, and still
655 * can't get enough buf, it means something abnormal
658 if (unlikely(tries >= vq->size))
665 static __rte_always_inline int
666 copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct vhost_virtqueue *vq,
667 struct rte_mbuf *m, struct buf_vector *buf_vec,
668 uint16_t num_buffers)
670 uint32_t vec_idx = 0;
671 uint64_t desc_addr, desc_gaddr;
672 uint32_t mbuf_offset, mbuf_avail;
673 uint32_t desc_offset, desc_avail;
675 uint64_t desc_chunck_len;
676 uint64_t hdr_addr, hdr_phys_addr;
677 struct rte_mbuf *hdr_mbuf;
678 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
679 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
680 uint16_t copy_nb = vq->batch_copy_nb_elems;
683 if (unlikely(m == NULL)) {
688 desc_chunck_len = buf_vec[vec_idx].buf_len;
689 desc_gaddr = buf_vec[vec_idx].buf_addr;
690 desc_addr = vhost_iova_to_vva(dev, vq,
694 if (buf_vec[vec_idx].buf_len < dev->vhost_hlen || !desc_addr) {
700 hdr_addr = desc_addr;
701 if (unlikely(desc_chunck_len < dev->vhost_hlen))
704 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
705 hdr_phys_addr = desc_gaddr;
706 rte_prefetch0((void *)(uintptr_t)hdr_addr);
708 LOG_DEBUG(VHOST_DATA, "(%d) RX: num merge buffers %d\n",
709 dev->vid, num_buffers);
711 desc_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
712 if (unlikely(desc_chunck_len < dev->vhost_hlen)) {
713 desc_chunck_len = desc_avail;
714 desc_gaddr += dev->vhost_hlen;
715 desc_addr = vhost_iova_to_vva(dev, vq,
719 if (unlikely(!desc_addr)) {
726 desc_offset = dev->vhost_hlen;
727 desc_chunck_len -= dev->vhost_hlen;
731 mbuf_avail = rte_pktmbuf_data_len(m);
733 while (mbuf_avail != 0 || m->next != NULL) {
734 /* done with current desc buf, get the next one */
735 if (desc_avail == 0) {
737 desc_chunck_len = buf_vec[vec_idx].buf_len;
738 desc_gaddr = buf_vec[vec_idx].buf_addr;
740 vhost_iova_to_vva(dev, vq,
744 if (unlikely(!desc_addr)) {
749 /* Prefetch buffer address. */
750 rte_prefetch0((void *)(uintptr_t)desc_addr);
752 desc_avail = buf_vec[vec_idx].buf_len;
753 } else if (unlikely(desc_chunck_len == 0)) {
754 desc_chunck_len = desc_avail;
755 desc_gaddr += desc_offset;
756 desc_addr = vhost_iova_to_vva(dev, vq,
758 &desc_chunck_len, VHOST_ACCESS_RW);
759 if (unlikely(!desc_addr)) {
766 /* done with current mbuf, get the next one */
767 if (mbuf_avail == 0) {
771 mbuf_avail = rte_pktmbuf_data_len(m);
775 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
776 ASSIGN_UNLESS_EQUAL(hdr->num_buffers, num_buffers);
778 if (unlikely(hdr == &tmp_hdr)) {
780 uint64_t remain = dev->vhost_hlen;
781 uint64_t src = (uint64_t)(uintptr_t)hdr, dst;
782 uint64_t guest_addr = hdr_phys_addr;
786 dst = vhost_iova_to_vva(dev, vq,
789 if (unlikely(!dst || !len)) {
794 rte_memcpy((void *)(uintptr_t)dst,
795 (void *)(uintptr_t)src,
798 PRINT_PACKET(dev, (uintptr_t)dst,
800 vhost_log_write(dev, guest_addr, len);
807 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
809 vhost_log_write(dev, hdr_phys_addr,
816 cpy_len = RTE_MIN(desc_chunck_len, mbuf_avail);
818 if (likely(cpy_len > MAX_BATCH_LEN || copy_nb >= vq->size)) {
819 rte_memcpy((void *)((uintptr_t)(desc_addr +
821 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
823 vhost_log_write(dev, desc_gaddr + desc_offset, cpy_len);
824 PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
827 batch_copy[copy_nb].dst =
828 (void *)((uintptr_t)(desc_addr + desc_offset));
829 batch_copy[copy_nb].src =
830 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
831 batch_copy[copy_nb].log_addr = desc_gaddr + desc_offset;
832 batch_copy[copy_nb].len = cpy_len;
836 mbuf_avail -= cpy_len;
837 mbuf_offset += cpy_len;
838 desc_avail -= cpy_len;
839 desc_offset += cpy_len;
840 desc_chunck_len -= cpy_len;
844 vq->batch_copy_nb_elems = copy_nb;
849 static __rte_always_inline uint32_t
850 virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
851 struct rte_mbuf **pkts, uint32_t count)
853 struct vhost_virtqueue *vq;
854 uint32_t pkt_idx = 0;
855 uint16_t num_buffers;
856 struct buf_vector buf_vec[BUF_VECTOR_MAX];
859 LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
860 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
861 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
862 dev->vid, __func__, queue_id);
866 vq = dev->virtqueue[queue_id];
868 rte_spinlock_lock(&vq->access_lock);
870 if (unlikely(vq->enabled == 0))
871 goto out_access_unlock;
873 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
874 vhost_user_iotlb_rd_lock(vq);
876 if (unlikely(vq->access_ok == 0))
877 if (unlikely(vring_translate(dev, vq) < 0))
880 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
884 vq->batch_copy_nb_elems = 0;
886 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
888 vq->shadow_used_idx = 0;
889 avail_head = *((volatile uint16_t *)&vq->avail->idx);
890 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
891 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
893 if (unlikely(reserve_avail_buf_mergeable(dev, vq,
894 pkt_len, buf_vec, &num_buffers,
896 LOG_DEBUG(VHOST_DATA,
897 "(%d) failed to get enough desc from vring\n",
899 vq->shadow_used_idx -= num_buffers;
903 LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n",
904 dev->vid, vq->last_avail_idx,
905 vq->last_avail_idx + num_buffers);
907 if (copy_mbuf_to_desc_mergeable(dev, vq, pkts[pkt_idx],
908 buf_vec, num_buffers) < 0) {
909 vq->shadow_used_idx -= num_buffers;
913 vq->last_avail_idx += num_buffers;
916 do_data_copy_enqueue(dev, vq);
918 if (likely(vq->shadow_used_idx)) {
919 flush_shadow_used_ring(dev, vq);
921 /* flush used->idx update before we read avail->flags. */
924 /* Kick the guest if necessary. */
925 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
926 && (vq->callfd >= 0))
927 eventfd_write(vq->callfd, (eventfd_t)1);
931 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
932 vhost_user_iotlb_rd_unlock(vq);
935 rte_spinlock_unlock(&vq->access_lock);
941 rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
942 struct rte_mbuf **pkts, uint16_t count)
944 struct virtio_net *dev = get_device(vid);
949 if (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF))
950 return virtio_dev_merge_rx(dev, queue_id, pkts, count);
952 return virtio_dev_rx(dev, queue_id, pkts, count);
956 virtio_net_with_host_offload(struct virtio_net *dev)
959 ((1ULL << VIRTIO_NET_F_CSUM) |
960 (1ULL << VIRTIO_NET_F_HOST_ECN) |
961 (1ULL << VIRTIO_NET_F_HOST_TSO4) |
962 (1ULL << VIRTIO_NET_F_HOST_TSO6) |
963 (1ULL << VIRTIO_NET_F_HOST_UFO)))
970 parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
972 struct ipv4_hdr *ipv4_hdr;
973 struct ipv6_hdr *ipv6_hdr;
975 struct ether_hdr *eth_hdr;
978 eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
980 m->l2_len = sizeof(struct ether_hdr);
981 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
983 if (ethertype == ETHER_TYPE_VLAN) {
984 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
986 m->l2_len += sizeof(struct vlan_hdr);
987 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
990 l3_hdr = (char *)eth_hdr + m->l2_len;
993 case ETHER_TYPE_IPv4:
995 *l4_proto = ipv4_hdr->next_proto_id;
996 m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
997 *l4_hdr = (char *)l3_hdr + m->l3_len;
998 m->ol_flags |= PKT_TX_IPV4;
1000 case ETHER_TYPE_IPv6:
1002 *l4_proto = ipv6_hdr->proto;
1003 m->l3_len = sizeof(struct ipv6_hdr);
1004 *l4_hdr = (char *)l3_hdr + m->l3_len;
1005 m->ol_flags |= PKT_TX_IPV6;
1015 static __rte_always_inline void
1016 vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
1018 uint16_t l4_proto = 0;
1019 void *l4_hdr = NULL;
1020 struct tcp_hdr *tcp_hdr = NULL;
1022 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1025 parse_ethernet(m, &l4_proto, &l4_hdr);
1026 if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1027 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
1028 switch (hdr->csum_offset) {
1029 case (offsetof(struct tcp_hdr, cksum)):
1030 if (l4_proto == IPPROTO_TCP)
1031 m->ol_flags |= PKT_TX_TCP_CKSUM;
1033 case (offsetof(struct udp_hdr, dgram_cksum)):
1034 if (l4_proto == IPPROTO_UDP)
1035 m->ol_flags |= PKT_TX_UDP_CKSUM;
1037 case (offsetof(struct sctp_hdr, cksum)):
1038 if (l4_proto == IPPROTO_SCTP)
1039 m->ol_flags |= PKT_TX_SCTP_CKSUM;
1047 if (l4_hdr && hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1048 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1049 case VIRTIO_NET_HDR_GSO_TCPV4:
1050 case VIRTIO_NET_HDR_GSO_TCPV6:
1052 m->ol_flags |= PKT_TX_TCP_SEG;
1053 m->tso_segsz = hdr->gso_size;
1054 m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
1057 RTE_LOG(WARNING, VHOST_DATA,
1058 "unsupported gso type %u.\n", hdr->gso_type);
1064 #define RARP_PKT_SIZE 64
1067 make_rarp_packet(struct rte_mbuf *rarp_mbuf, const struct ether_addr *mac)
1069 struct ether_hdr *eth_hdr;
1070 struct arp_hdr *rarp;
1072 if (rarp_mbuf->buf_len < 64) {
1073 RTE_LOG(WARNING, VHOST_DATA,
1074 "failed to make RARP; mbuf size too small %u (< %d)\n",
1075 rarp_mbuf->buf_len, RARP_PKT_SIZE);
1079 /* Ethernet header. */
1080 eth_hdr = rte_pktmbuf_mtod_offset(rarp_mbuf, struct ether_hdr *, 0);
1081 memset(eth_hdr->d_addr.addr_bytes, 0xff, ETHER_ADDR_LEN);
1082 ether_addr_copy(mac, ð_hdr->s_addr);
1083 eth_hdr->ether_type = htons(ETHER_TYPE_RARP);
1086 rarp = (struct arp_hdr *)(eth_hdr + 1);
1087 rarp->arp_hrd = htons(ARP_HRD_ETHER);
1088 rarp->arp_pro = htons(ETHER_TYPE_IPv4);
1089 rarp->arp_hln = ETHER_ADDR_LEN;
1091 rarp->arp_op = htons(ARP_OP_REVREQUEST);
1093 ether_addr_copy(mac, &rarp->arp_data.arp_sha);
1094 ether_addr_copy(mac, &rarp->arp_data.arp_tha);
1095 memset(&rarp->arp_data.arp_sip, 0x00, 4);
1096 memset(&rarp->arp_data.arp_tip, 0x00, 4);
1098 rarp_mbuf->pkt_len = rarp_mbuf->data_len = RARP_PKT_SIZE;
1103 static __rte_always_inline void
1104 put_zmbuf(struct zcopy_mbuf *zmbuf)
1109 static __rte_always_inline int
1110 copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
1111 struct vring_desc *descs, uint16_t max_desc,
1112 struct rte_mbuf *m, uint16_t desc_idx,
1113 struct rte_mempool *mbuf_pool)
1115 struct vring_desc *desc;
1116 uint64_t desc_addr, desc_gaddr;
1117 uint32_t desc_avail, desc_offset;
1118 uint32_t mbuf_avail, mbuf_offset;
1120 uint64_t desc_chunck_len;
1121 struct rte_mbuf *cur = m, *prev = m;
1122 struct virtio_net_hdr tmp_hdr;
1123 struct virtio_net_hdr *hdr = NULL;
1124 /* A counter to avoid desc dead loop chain */
1125 uint32_t nr_desc = 1;
1126 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
1127 uint16_t copy_nb = vq->batch_copy_nb_elems;
1130 desc = &descs[desc_idx];
1131 if (unlikely((desc->len < dev->vhost_hlen)) ||
1132 (desc->flags & VRING_DESC_F_INDIRECT)) {
1137 desc_chunck_len = desc->len;
1138 desc_gaddr = desc->addr;
1139 desc_addr = vhost_iova_to_vva(dev,
1143 if (unlikely(!desc_addr)) {
1148 if (virtio_net_with_host_offload(dev)) {
1149 if (unlikely(desc_chunck_len < sizeof(struct virtio_net_hdr))) {
1150 uint64_t len = desc_chunck_len;
1151 uint64_t remain = sizeof(struct virtio_net_hdr);
1152 uint64_t src = desc_addr;
1153 uint64_t dst = (uint64_t)(uintptr_t)&tmp_hdr;
1154 uint64_t guest_addr = desc_gaddr;
1157 * No luck, the virtio-net header doesn't fit
1158 * in a contiguous virtual area.
1162 src = vhost_iova_to_vva(dev, vq,
1165 if (unlikely(!src || !len)) {
1170 rte_memcpy((void *)(uintptr_t)dst,
1171 (void *)(uintptr_t)src, len);
1180 hdr = (struct virtio_net_hdr *)((uintptr_t)desc_addr);
1186 * A virtio driver normally uses at least 2 desc buffers
1187 * for Tx: the first for storing the header, and others
1188 * for storing the data.
1190 if (likely((desc->len == dev->vhost_hlen) &&
1191 (desc->flags & VRING_DESC_F_NEXT) != 0)) {
1192 desc = &descs[desc->next];
1193 if (unlikely(desc->flags & VRING_DESC_F_INDIRECT)) {
1198 desc_chunck_len = desc->len;
1199 desc_gaddr = desc->addr;
1200 desc_addr = vhost_iova_to_vva(dev,
1204 if (unlikely(!desc_addr)) {
1210 desc_avail = desc->len;
1213 desc_avail = desc->len - dev->vhost_hlen;
1215 if (unlikely(desc_chunck_len < dev->vhost_hlen)) {
1216 desc_chunck_len = desc_avail;
1217 desc_gaddr += dev->vhost_hlen;
1218 desc_addr = vhost_iova_to_vva(dev,
1222 if (unlikely(!desc_addr)) {
1229 desc_offset = dev->vhost_hlen;
1230 desc_chunck_len -= dev->vhost_hlen;
1234 rte_prefetch0((void *)(uintptr_t)(desc_addr + desc_offset));
1236 PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
1237 (uint32_t)desc_chunck_len, 0);
1240 mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
1244 cpy_len = RTE_MIN(desc_chunck_len, mbuf_avail);
1247 * A desc buf might across two host physical pages that are
1248 * not continuous. In such case (gpa_to_hpa returns 0), data
1249 * will be copied even though zero copy is enabled.
1251 if (unlikely(dev->dequeue_zero_copy && (hpa = gpa_to_hpa(dev,
1252 desc_gaddr + desc_offset, cpy_len)))) {
1253 cur->data_len = cpy_len;
1255 cur->buf_addr = (void *)(uintptr_t)(desc_addr
1257 cur->buf_iova = hpa;
1260 * In zero copy mode, one mbuf can only reference data
1261 * for one or partial of one desc buff.
1263 mbuf_avail = cpy_len;
1265 if (likely(cpy_len > MAX_BATCH_LEN ||
1266 copy_nb >= vq->size ||
1267 (hdr && cur == m) ||
1268 desc->len != desc_chunck_len)) {
1269 rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
1271 (void *)((uintptr_t)(desc_addr +
1275 batch_copy[copy_nb].dst =
1276 rte_pktmbuf_mtod_offset(cur, void *,
1278 batch_copy[copy_nb].src =
1279 (void *)((uintptr_t)(desc_addr +
1281 batch_copy[copy_nb].len = cpy_len;
1286 mbuf_avail -= cpy_len;
1287 mbuf_offset += cpy_len;
1288 desc_avail -= cpy_len;
1289 desc_chunck_len -= cpy_len;
1290 desc_offset += cpy_len;
1292 /* This desc reaches to its end, get the next one */
1293 if (desc_avail == 0) {
1294 if ((desc->flags & VRING_DESC_F_NEXT) == 0)
1297 if (unlikely(desc->next >= max_desc ||
1298 ++nr_desc > max_desc)) {
1302 desc = &descs[desc->next];
1303 if (unlikely(desc->flags & VRING_DESC_F_INDIRECT)) {
1308 desc_chunck_len = desc->len;
1309 desc_gaddr = desc->addr;
1310 desc_addr = vhost_iova_to_vva(dev,
1314 if (unlikely(!desc_addr)) {
1319 rte_prefetch0((void *)(uintptr_t)desc_addr);
1322 desc_avail = desc->len;
1324 PRINT_PACKET(dev, (uintptr_t)desc_addr,
1325 (uint32_t)desc_chunck_len, 0);
1326 } else if (unlikely(desc_chunck_len == 0)) {
1327 desc_chunck_len = desc_avail;
1328 desc_gaddr += desc_offset;
1329 desc_addr = vhost_iova_to_vva(dev, vq,
1333 if (unlikely(!desc_addr)) {
1339 PRINT_PACKET(dev, (uintptr_t)desc_addr,
1340 (uint32_t)desc_chunck_len, 0);
1344 * This mbuf reaches to its end, get a new one
1345 * to hold more data.
1347 if (mbuf_avail == 0) {
1348 cur = rte_pktmbuf_alloc(mbuf_pool);
1349 if (unlikely(cur == NULL)) {
1350 RTE_LOG(ERR, VHOST_DATA, "Failed to "
1351 "allocate memory for mbuf.\n");
1355 if (unlikely(dev->dequeue_zero_copy))
1356 rte_mbuf_refcnt_update(cur, 1);
1359 prev->data_len = mbuf_offset;
1361 m->pkt_len += mbuf_offset;
1365 mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
1369 prev->data_len = mbuf_offset;
1370 m->pkt_len += mbuf_offset;
1373 vhost_dequeue_offload(hdr, m);
1376 vq->batch_copy_nb_elems = copy_nb;
1381 static __rte_always_inline void
1382 update_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq,
1383 uint32_t used_idx, uint32_t desc_idx)
1385 vq->used->ring[used_idx].id = desc_idx;
1386 vq->used->ring[used_idx].len = 0;
1387 vhost_log_used_vring(dev, vq,
1388 offsetof(struct vring_used, ring[used_idx]),
1389 sizeof(vq->used->ring[used_idx]));
1392 static __rte_always_inline void
1393 update_used_idx(struct virtio_net *dev, struct vhost_virtqueue *vq,
1396 if (unlikely(count == 0))
1402 vq->used->idx += count;
1403 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
1404 sizeof(vq->used->idx));
1406 /* Kick guest if required. */
1407 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
1408 && (vq->callfd >= 0))
1409 eventfd_write(vq->callfd, (eventfd_t)1);
1412 static __rte_always_inline struct zcopy_mbuf *
1413 get_zmbuf(struct vhost_virtqueue *vq)
1419 /* search [last_zmbuf_idx, zmbuf_size) */
1420 i = vq->last_zmbuf_idx;
1421 last = vq->zmbuf_size;
1424 for (; i < last; i++) {
1425 if (vq->zmbufs[i].in_use == 0) {
1426 vq->last_zmbuf_idx = i + 1;
1427 vq->zmbufs[i].in_use = 1;
1428 return &vq->zmbufs[i];
1434 /* search [0, last_zmbuf_idx) */
1436 last = vq->last_zmbuf_idx;
1443 static __rte_always_inline bool
1444 mbuf_is_consumed(struct rte_mbuf *m)
1447 if (rte_mbuf_refcnt_read(m) > 1)
1455 static __rte_always_inline void
1456 restore_mbuf(struct rte_mbuf *m)
1458 uint32_t mbuf_size, priv_size;
1461 priv_size = rte_pktmbuf_priv_size(m->pool);
1462 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
1463 /* start of buffer is after mbuf structure and priv data */
1465 m->buf_addr = (char *)m + mbuf_size;
1466 m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
1472 rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
1473 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
1475 struct virtio_net *dev;
1476 struct rte_mbuf *rarp_mbuf = NULL;
1477 struct vhost_virtqueue *vq;
1478 uint32_t desc_indexes[MAX_PKT_BURST];
1481 uint16_t free_entries;
1484 dev = get_device(vid);
1488 if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
1489 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
1490 dev->vid, __func__, queue_id);
1494 vq = dev->virtqueue[queue_id];
1496 if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0))
1499 if (unlikely(vq->enabled == 0))
1500 goto out_access_unlock;
1502 vq->batch_copy_nb_elems = 0;
1504 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1505 vhost_user_iotlb_rd_lock(vq);
1507 if (unlikely(vq->access_ok == 0))
1508 if (unlikely(vring_translate(dev, vq) < 0))
1511 if (unlikely(dev->dequeue_zero_copy)) {
1512 struct zcopy_mbuf *zmbuf, *next;
1515 for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
1516 zmbuf != NULL; zmbuf = next) {
1517 next = TAILQ_NEXT(zmbuf, next);
1519 if (mbuf_is_consumed(zmbuf->mbuf)) {
1520 used_idx = vq->last_used_idx++ & (vq->size - 1);
1521 update_used_ring(dev, vq, used_idx,
1525 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
1526 restore_mbuf(zmbuf->mbuf);
1527 rte_pktmbuf_free(zmbuf->mbuf);
1533 update_used_idx(dev, vq, nr_updated);
1537 * Construct a RARP broadcast packet, and inject it to the "pkts"
1538 * array, to looks like that guest actually send such packet.
1540 * Check user_send_rarp() for more information.
1542 * broadcast_rarp shares a cacheline in the virtio_net structure
1543 * with some fields that are accessed during enqueue and
1544 * rte_atomic16_cmpset() causes a write if using cmpxchg. This could
1545 * result in false sharing between enqueue and dequeue.
1547 * Prevent unnecessary false sharing by reading broadcast_rarp first
1548 * and only performing cmpset if the read indicates it is likely to
1552 if (unlikely(rte_atomic16_read(&dev->broadcast_rarp) &&
1553 rte_atomic16_cmpset((volatile uint16_t *)
1554 &dev->broadcast_rarp.cnt, 1, 0))) {
1556 rarp_mbuf = rte_pktmbuf_alloc(mbuf_pool);
1557 if (rarp_mbuf == NULL) {
1558 RTE_LOG(ERR, VHOST_DATA,
1559 "Failed to allocate memory for mbuf.\n");
1563 if (make_rarp_packet(rarp_mbuf, &dev->mac)) {
1564 rte_pktmbuf_free(rarp_mbuf);
1571 free_entries = *((volatile uint16_t *)&vq->avail->idx) -
1573 if (free_entries == 0)
1576 LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
1578 /* Prefetch available and used ring */
1579 avail_idx = vq->last_avail_idx & (vq->size - 1);
1580 used_idx = vq->last_used_idx & (vq->size - 1);
1581 rte_prefetch0(&vq->avail->ring[avail_idx]);
1582 rte_prefetch0(&vq->used->ring[used_idx]);
1584 count = RTE_MIN(count, MAX_PKT_BURST);
1585 count = RTE_MIN(count, free_entries);
1586 LOG_DEBUG(VHOST_DATA, "(%d) about to dequeue %u buffers\n",
1589 /* Retrieve all of the head indexes first to avoid caching issues. */
1590 for (i = 0; i < count; i++) {
1591 avail_idx = (vq->last_avail_idx + i) & (vq->size - 1);
1592 used_idx = (vq->last_used_idx + i) & (vq->size - 1);
1593 desc_indexes[i] = vq->avail->ring[avail_idx];
1595 if (likely(dev->dequeue_zero_copy == 0))
1596 update_used_ring(dev, vq, used_idx, desc_indexes[i]);
1599 /* Prefetch descriptor index. */
1600 rte_prefetch0(&vq->desc[desc_indexes[0]]);
1601 for (i = 0; i < count; i++) {
1602 struct vring_desc *desc, *idesc = NULL;
1607 if (likely(i + 1 < count))
1608 rte_prefetch0(&vq->desc[desc_indexes[i + 1]]);
1610 if (vq->desc[desc_indexes[i]].flags & VRING_DESC_F_INDIRECT) {
1611 dlen = vq->desc[desc_indexes[i]].len;
1612 desc = (struct vring_desc *)(uintptr_t)
1613 vhost_iova_to_vva(dev, vq,
1614 vq->desc[desc_indexes[i]].addr,
1617 if (unlikely(!desc))
1620 if (unlikely(dlen < vq->desc[desc_indexes[i]].len)) {
1622 * The indirect desc table is not contiguous
1623 * in process VA space, we have to copy it.
1625 idesc = alloc_copy_ind_table(dev, vq,
1626 &vq->desc[desc_indexes[i]]);
1627 if (unlikely(!idesc))
1633 rte_prefetch0(desc);
1634 sz = vq->desc[desc_indexes[i]].len / sizeof(*desc);
1639 idx = desc_indexes[i];
1642 pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
1643 if (unlikely(pkts[i] == NULL)) {
1644 RTE_LOG(ERR, VHOST_DATA,
1645 "Failed to allocate memory for mbuf.\n");
1646 free_ind_table(idesc);
1650 err = copy_desc_to_mbuf(dev, vq, desc, sz, pkts[i], idx,
1652 if (unlikely(err)) {
1653 rte_pktmbuf_free(pkts[i]);
1654 free_ind_table(idesc);
1658 if (unlikely(dev->dequeue_zero_copy)) {
1659 struct zcopy_mbuf *zmbuf;
1661 zmbuf = get_zmbuf(vq);
1663 rte_pktmbuf_free(pkts[i]);
1664 free_ind_table(idesc);
1667 zmbuf->mbuf = pkts[i];
1668 zmbuf->desc_idx = desc_indexes[i];
1671 * Pin lock the mbuf; we will check later to see
1672 * whether the mbuf is freed (when we are the last
1673 * user) or not. If that's the case, we then could
1674 * update the used ring safely.
1676 rte_mbuf_refcnt_update(pkts[i], 1);
1679 TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next);
1682 if (unlikely(!!idesc))
1683 free_ind_table(idesc);
1685 vq->last_avail_idx += i;
1687 if (likely(dev->dequeue_zero_copy == 0)) {
1688 do_data_copy_dequeue(vq);
1689 vq->last_used_idx += i;
1690 update_used_idx(dev, vq, i);
1694 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1695 vhost_user_iotlb_rd_unlock(vq);
1698 rte_spinlock_unlock(&vq->access_lock);
1700 if (unlikely(rarp_mbuf != NULL)) {
1702 * Inject it to the head of "pkts" array, so that switch's mac
1703 * learning table will get updated first.
1705 memmove(&pkts[1], pkts, i * sizeof(struct rte_mbuf *));
1706 pkts[0] = rarp_mbuf;