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>
12 #include <rte_ether.h>
14 #include <rte_vhost.h>
19 #include <rte_spinlock.h>
20 #include <rte_malloc.h>
21 #include <rte_vhost_async.h>
26 #define MAX_BATCH_LEN 256
28 static __rte_always_inline bool
29 rxvq_is_mergeable(struct virtio_net *dev)
31 return dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF);
34 static __rte_always_inline bool
35 virtio_net_is_inorder(struct virtio_net *dev)
37 return dev->features & (1ULL << VIRTIO_F_IN_ORDER);
41 is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
43 return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
47 do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq)
49 struct batch_copy_elem *elem = vq->batch_copy_elems;
50 uint16_t count = vq->batch_copy_nb_elems;
53 for (i = 0; i < count; i++) {
54 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
55 vhost_log_cache_write_iova(dev, vq, elem[i].log_addr,
57 PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0);
60 vq->batch_copy_nb_elems = 0;
64 do_data_copy_dequeue(struct vhost_virtqueue *vq)
66 struct batch_copy_elem *elem = vq->batch_copy_elems;
67 uint16_t count = vq->batch_copy_nb_elems;
70 for (i = 0; i < count; i++)
71 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
73 vq->batch_copy_nb_elems = 0;
76 static __rte_always_inline void
77 do_flush_shadow_used_ring_split(struct virtio_net *dev,
78 struct vhost_virtqueue *vq,
79 uint16_t to, uint16_t from, uint16_t size)
81 rte_memcpy(&vq->used->ring[to],
82 &vq->shadow_used_split[from],
83 size * sizeof(struct vring_used_elem));
84 vhost_log_cache_used_vring(dev, vq,
85 offsetof(struct vring_used, ring[to]),
86 size * sizeof(struct vring_used_elem));
89 static __rte_always_inline void
90 flush_shadow_used_ring_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
92 uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
94 if (used_idx + vq->shadow_used_idx <= vq->size) {
95 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0,
100 /* update used ring interval [used_idx, vq->size] */
101 size = vq->size - used_idx;
102 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, size);
104 /* update the left half used ring interval [0, left_size] */
105 do_flush_shadow_used_ring_split(dev, vq, 0, size,
106 vq->shadow_used_idx - size);
108 vq->last_used_idx += vq->shadow_used_idx;
110 vhost_log_cache_sync(dev, vq);
112 __atomic_add_fetch(&vq->used->idx, vq->shadow_used_idx,
114 vq->shadow_used_idx = 0;
115 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
116 sizeof(vq->used->idx));
119 static __rte_always_inline void
120 update_shadow_used_ring_split(struct vhost_virtqueue *vq,
121 uint16_t desc_idx, uint32_t len)
123 uint16_t i = vq->shadow_used_idx++;
125 vq->shadow_used_split[i].id = desc_idx;
126 vq->shadow_used_split[i].len = len;
129 static __rte_always_inline void
130 vhost_flush_enqueue_shadow_packed(struct virtio_net *dev,
131 struct vhost_virtqueue *vq)
134 uint16_t used_idx = vq->last_used_idx;
135 uint16_t head_idx = vq->last_used_idx;
136 uint16_t head_flags = 0;
138 /* Split loop in two to save memory barriers */
139 for (i = 0; i < vq->shadow_used_idx; i++) {
140 vq->desc_packed[used_idx].id = vq->shadow_used_packed[i].id;
141 vq->desc_packed[used_idx].len = vq->shadow_used_packed[i].len;
143 used_idx += vq->shadow_used_packed[i].count;
144 if (used_idx >= vq->size)
145 used_idx -= vq->size;
148 /* The ordering for storing desc flags needs to be enforced. */
149 rte_atomic_thread_fence(__ATOMIC_RELEASE);
151 for (i = 0; i < vq->shadow_used_idx; i++) {
154 if (vq->shadow_used_packed[i].len)
155 flags = VRING_DESC_F_WRITE;
159 if (vq->used_wrap_counter) {
160 flags |= VRING_DESC_F_USED;
161 flags |= VRING_DESC_F_AVAIL;
163 flags &= ~VRING_DESC_F_USED;
164 flags &= ~VRING_DESC_F_AVAIL;
168 vq->desc_packed[vq->last_used_idx].flags = flags;
170 vhost_log_cache_used_vring(dev, vq,
172 sizeof(struct vring_packed_desc),
173 sizeof(struct vring_packed_desc));
175 head_idx = vq->last_used_idx;
179 vq_inc_last_used_packed(vq, vq->shadow_used_packed[i].count);
182 vq->desc_packed[head_idx].flags = head_flags;
184 vhost_log_cache_used_vring(dev, vq,
186 sizeof(struct vring_packed_desc),
187 sizeof(struct vring_packed_desc));
189 vq->shadow_used_idx = 0;
190 vhost_log_cache_sync(dev, vq);
193 static __rte_always_inline void
194 vhost_flush_dequeue_shadow_packed(struct virtio_net *dev,
195 struct vhost_virtqueue *vq)
197 struct vring_used_elem_packed *used_elem = &vq->shadow_used_packed[0];
199 vq->desc_packed[vq->shadow_last_used_idx].id = used_elem->id;
200 /* desc flags is the synchronization point for virtio packed vring */
201 __atomic_store_n(&vq->desc_packed[vq->shadow_last_used_idx].flags,
202 used_elem->flags, __ATOMIC_RELEASE);
204 vhost_log_cache_used_vring(dev, vq, vq->shadow_last_used_idx *
205 sizeof(struct vring_packed_desc),
206 sizeof(struct vring_packed_desc));
207 vq->shadow_used_idx = 0;
208 vhost_log_cache_sync(dev, vq);
211 static __rte_always_inline void
212 vhost_flush_enqueue_batch_packed(struct virtio_net *dev,
213 struct vhost_virtqueue *vq,
219 uint16_t last_used_idx;
220 struct vring_packed_desc *desc_base;
222 last_used_idx = vq->last_used_idx;
223 desc_base = &vq->desc_packed[last_used_idx];
225 flags = PACKED_DESC_ENQUEUE_USED_FLAG(vq->used_wrap_counter);
227 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
228 desc_base[i].id = ids[i];
229 desc_base[i].len = lens[i];
232 rte_atomic_thread_fence(__ATOMIC_RELEASE);
234 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
235 desc_base[i].flags = flags;
238 vhost_log_cache_used_vring(dev, vq, last_used_idx *
239 sizeof(struct vring_packed_desc),
240 sizeof(struct vring_packed_desc) *
242 vhost_log_cache_sync(dev, vq);
244 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
247 static __rte_always_inline void
248 vhost_shadow_dequeue_batch_packed_inorder(struct vhost_virtqueue *vq,
251 vq->shadow_used_packed[0].id = id;
253 if (!vq->shadow_used_idx) {
254 vq->shadow_last_used_idx = vq->last_used_idx;
255 vq->shadow_used_packed[0].flags =
256 PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
257 vq->shadow_used_packed[0].len = 0;
258 vq->shadow_used_packed[0].count = 1;
259 vq->shadow_used_idx++;
262 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
265 static __rte_always_inline void
266 vhost_shadow_dequeue_batch_packed(struct virtio_net *dev,
267 struct vhost_virtqueue *vq,
274 flags = PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
276 if (!vq->shadow_used_idx) {
277 vq->shadow_last_used_idx = vq->last_used_idx;
278 vq->shadow_used_packed[0].id = ids[0];
279 vq->shadow_used_packed[0].len = 0;
280 vq->shadow_used_packed[0].count = 1;
281 vq->shadow_used_packed[0].flags = flags;
282 vq->shadow_used_idx++;
287 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE) {
288 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
289 vq->desc_packed[vq->last_used_idx + i].len = 0;
292 rte_atomic_thread_fence(__ATOMIC_RELEASE);
293 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE)
294 vq->desc_packed[vq->last_used_idx + i].flags = flags;
296 vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
297 sizeof(struct vring_packed_desc),
298 sizeof(struct vring_packed_desc) *
300 vhost_log_cache_sync(dev, vq);
302 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
305 static __rte_always_inline void
306 vhost_shadow_dequeue_single_packed(struct vhost_virtqueue *vq,
312 flags = vq->desc_packed[vq->last_used_idx].flags;
313 if (vq->used_wrap_counter) {
314 flags |= VRING_DESC_F_USED;
315 flags |= VRING_DESC_F_AVAIL;
317 flags &= ~VRING_DESC_F_USED;
318 flags &= ~VRING_DESC_F_AVAIL;
321 if (!vq->shadow_used_idx) {
322 vq->shadow_last_used_idx = vq->last_used_idx;
324 vq->shadow_used_packed[0].id = buf_id;
325 vq->shadow_used_packed[0].len = 0;
326 vq->shadow_used_packed[0].flags = flags;
327 vq->shadow_used_idx++;
329 vq->desc_packed[vq->last_used_idx].id = buf_id;
330 vq->desc_packed[vq->last_used_idx].len = 0;
331 vq->desc_packed[vq->last_used_idx].flags = flags;
334 vq_inc_last_used_packed(vq, count);
337 static __rte_always_inline void
338 vhost_shadow_dequeue_single_packed_inorder(struct vhost_virtqueue *vq,
344 vq->shadow_used_packed[0].id = buf_id;
346 flags = vq->desc_packed[vq->last_used_idx].flags;
347 if (vq->used_wrap_counter) {
348 flags |= VRING_DESC_F_USED;
349 flags |= VRING_DESC_F_AVAIL;
351 flags &= ~VRING_DESC_F_USED;
352 flags &= ~VRING_DESC_F_AVAIL;
355 if (!vq->shadow_used_idx) {
356 vq->shadow_last_used_idx = vq->last_used_idx;
357 vq->shadow_used_packed[0].len = 0;
358 vq->shadow_used_packed[0].flags = flags;
359 vq->shadow_used_idx++;
362 vq_inc_last_used_packed(vq, count);
365 static __rte_always_inline void
366 vhost_shadow_enqueue_packed(struct vhost_virtqueue *vq,
370 uint16_t num_buffers)
374 for (i = 0; i < num_buffers; i++) {
375 /* enqueue shadow flush action aligned with batch num */
376 if (!vq->shadow_used_idx)
377 vq->shadow_aligned_idx = vq->last_used_idx &
379 vq->shadow_used_packed[vq->shadow_used_idx].id = id[i];
380 vq->shadow_used_packed[vq->shadow_used_idx].len = len[i];
381 vq->shadow_used_packed[vq->shadow_used_idx].count = count[i];
382 vq->shadow_aligned_idx += count[i];
383 vq->shadow_used_idx++;
387 static __rte_always_inline void
388 vhost_shadow_enqueue_single_packed(struct virtio_net *dev,
389 struct vhost_virtqueue *vq,
393 uint16_t num_buffers)
395 vhost_shadow_enqueue_packed(vq, len, id, count, num_buffers);
397 if (vq->shadow_aligned_idx >= PACKED_BATCH_SIZE) {
398 do_data_copy_enqueue(dev, vq);
399 vhost_flush_enqueue_shadow_packed(dev, vq);
403 /* avoid write operation when necessary, to lessen cache issues */
404 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
405 if ((var) != (val)) \
409 static __rte_always_inline void
410 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
412 uint64_t csum_l4 = m_buf->ol_flags & RTE_MBUF_F_TX_L4_MASK;
414 if (m_buf->ol_flags & RTE_MBUF_F_TX_TCP_SEG)
415 csum_l4 |= RTE_MBUF_F_TX_TCP_CKSUM;
418 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
419 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
422 case RTE_MBUF_F_TX_TCP_CKSUM:
423 net_hdr->csum_offset = (offsetof(struct rte_tcp_hdr,
426 case RTE_MBUF_F_TX_UDP_CKSUM:
427 net_hdr->csum_offset = (offsetof(struct rte_udp_hdr,
430 case RTE_MBUF_F_TX_SCTP_CKSUM:
431 net_hdr->csum_offset = (offsetof(struct rte_sctp_hdr,
436 ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
437 ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
438 ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
441 /* IP cksum verification cannot be bypassed, then calculate here */
442 if (m_buf->ol_flags & RTE_MBUF_F_TX_IP_CKSUM) {
443 struct rte_ipv4_hdr *ipv4_hdr;
445 ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct rte_ipv4_hdr *,
447 ipv4_hdr->hdr_checksum = 0;
448 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
451 if (m_buf->ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
452 if (m_buf->ol_flags & RTE_MBUF_F_TX_IPV4)
453 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
455 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
456 net_hdr->gso_size = m_buf->tso_segsz;
457 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
459 } else if (m_buf->ol_flags & RTE_MBUF_F_TX_UDP_SEG) {
460 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
461 net_hdr->gso_size = m_buf->tso_segsz;
462 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len +
465 ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
466 ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
467 ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
471 static __rte_always_inline int
472 map_one_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
473 struct buf_vector *buf_vec, uint16_t *vec_idx,
474 uint64_t desc_iova, uint64_t desc_len, uint8_t perm)
476 uint16_t vec_id = *vec_idx;
480 uint64_t desc_chunck_len = desc_len;
482 if (unlikely(vec_id >= BUF_VECTOR_MAX))
485 desc_addr = vhost_iova_to_vva(dev, vq,
489 if (unlikely(!desc_addr))
492 rte_prefetch0((void *)(uintptr_t)desc_addr);
494 buf_vec[vec_id].buf_iova = desc_iova;
495 buf_vec[vec_id].buf_addr = desc_addr;
496 buf_vec[vec_id].buf_len = desc_chunck_len;
498 desc_len -= desc_chunck_len;
499 desc_iova += desc_chunck_len;
507 static __rte_always_inline int
508 fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
509 uint32_t avail_idx, uint16_t *vec_idx,
510 struct buf_vector *buf_vec, uint16_t *desc_chain_head,
511 uint32_t *desc_chain_len, uint8_t perm)
513 uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
514 uint16_t vec_id = *vec_idx;
517 uint32_t nr_descs = vq->size;
519 struct vring_desc *descs = vq->desc;
520 struct vring_desc *idesc = NULL;
522 if (unlikely(idx >= vq->size))
525 *desc_chain_head = idx;
527 if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
528 dlen = vq->desc[idx].len;
529 nr_descs = dlen / sizeof(struct vring_desc);
530 if (unlikely(nr_descs > vq->size))
533 descs = (struct vring_desc *)(uintptr_t)
534 vhost_iova_to_vva(dev, vq, vq->desc[idx].addr,
537 if (unlikely(!descs))
540 if (unlikely(dlen < vq->desc[idx].len)) {
542 * The indirect desc table is not contiguous
543 * in process VA space, we have to copy it.
545 idesc = vhost_alloc_copy_ind_table(dev, vq,
546 vq->desc[idx].addr, vq->desc[idx].len);
547 if (unlikely(!idesc))
557 if (unlikely(idx >= nr_descs || cnt++ >= nr_descs)) {
558 free_ind_table(idesc);
562 dlen = descs[idx].len;
565 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
566 descs[idx].addr, dlen,
568 free_ind_table(idesc);
572 if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
575 idx = descs[idx].next;
578 *desc_chain_len = len;
581 if (unlikely(!!idesc))
582 free_ind_table(idesc);
588 * Returns -1 on fail, 0 on success
591 reserve_avail_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
592 uint32_t size, struct buf_vector *buf_vec,
593 uint16_t *num_buffers, uint16_t avail_head,
597 uint16_t vec_idx = 0;
598 uint16_t max_tries, tries = 0;
600 uint16_t head_idx = 0;
604 cur_idx = vq->last_avail_idx;
606 if (rxvq_is_mergeable(dev))
607 max_tries = vq->size - 1;
612 if (unlikely(cur_idx == avail_head))
615 * if we tried all available ring items, and still
616 * can't get enough buf, it means something abnormal
619 if (unlikely(++tries > max_tries))
622 if (unlikely(fill_vec_buf_split(dev, vq, cur_idx,
625 VHOST_ACCESS_RW) < 0))
627 len = RTE_MIN(len, size);
628 update_shadow_used_ring_split(vq, head_idx, len);
640 static __rte_always_inline int
641 fill_vec_buf_packed_indirect(struct virtio_net *dev,
642 struct vhost_virtqueue *vq,
643 struct vring_packed_desc *desc, uint16_t *vec_idx,
644 struct buf_vector *buf_vec, uint32_t *len, uint8_t perm)
648 uint16_t vec_id = *vec_idx;
650 struct vring_packed_desc *descs, *idescs = NULL;
653 descs = (struct vring_packed_desc *)(uintptr_t)
654 vhost_iova_to_vva(dev, vq, desc->addr, &dlen, VHOST_ACCESS_RO);
655 if (unlikely(!descs))
658 if (unlikely(dlen < desc->len)) {
660 * The indirect desc table is not contiguous
661 * in process VA space, we have to copy it.
663 idescs = vhost_alloc_copy_ind_table(dev,
664 vq, desc->addr, desc->len);
665 if (unlikely(!idescs))
671 nr_descs = desc->len / sizeof(struct vring_packed_desc);
672 if (unlikely(nr_descs >= vq->size)) {
673 free_ind_table(idescs);
677 for (i = 0; i < nr_descs; i++) {
678 if (unlikely(vec_id >= BUF_VECTOR_MAX)) {
679 free_ind_table(idescs);
685 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
692 if (unlikely(!!idescs))
693 free_ind_table(idescs);
698 static __rte_always_inline int
699 fill_vec_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
700 uint16_t avail_idx, uint16_t *desc_count,
701 struct buf_vector *buf_vec, uint16_t *vec_idx,
702 uint16_t *buf_id, uint32_t *len, uint8_t perm)
704 bool wrap_counter = vq->avail_wrap_counter;
705 struct vring_packed_desc *descs = vq->desc_packed;
706 uint16_t vec_id = *vec_idx;
709 if (avail_idx < vq->last_avail_idx)
713 * Perform a load-acquire barrier in desc_is_avail to
714 * enforce the ordering between desc flags and desc
717 if (unlikely(!desc_is_avail(&descs[avail_idx], wrap_counter)))
724 if (unlikely(vec_id >= BUF_VECTOR_MAX))
727 if (unlikely(*desc_count >= vq->size))
731 *buf_id = descs[avail_idx].id;
733 if (descs[avail_idx].flags & VRING_DESC_F_INDIRECT) {
734 if (unlikely(fill_vec_buf_packed_indirect(dev, vq,
740 dlen = descs[avail_idx].len;
743 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
744 descs[avail_idx].addr,
750 if ((descs[avail_idx].flags & VRING_DESC_F_NEXT) == 0)
753 if (++avail_idx >= vq->size) {
754 avail_idx -= vq->size;
764 static __rte_noinline void
765 copy_vnet_hdr_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
766 struct buf_vector *buf_vec,
767 struct virtio_net_hdr_mrg_rxbuf *hdr)
770 uint64_t remain = dev->vhost_hlen;
771 uint64_t src = (uint64_t)(uintptr_t)hdr, dst;
772 uint64_t iova = buf_vec->buf_iova;
775 len = RTE_MIN(remain,
777 dst = buf_vec->buf_addr;
778 rte_memcpy((void *)(uintptr_t)dst,
779 (void *)(uintptr_t)src,
782 PRINT_PACKET(dev, (uintptr_t)dst,
784 vhost_log_cache_write_iova(dev, vq,
794 static __rte_always_inline int
795 copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
796 struct rte_mbuf *m, struct buf_vector *buf_vec,
797 uint16_t nr_vec, uint16_t num_buffers)
799 uint32_t vec_idx = 0;
800 uint32_t mbuf_offset, mbuf_avail;
801 uint32_t buf_offset, buf_avail;
802 uint64_t buf_addr, buf_iova, buf_len;
805 struct rte_mbuf *hdr_mbuf;
806 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
807 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
810 if (unlikely(m == NULL)) {
815 buf_addr = buf_vec[vec_idx].buf_addr;
816 buf_iova = buf_vec[vec_idx].buf_iova;
817 buf_len = buf_vec[vec_idx].buf_len;
819 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
826 if (unlikely(buf_len < dev->vhost_hlen)) {
827 memset(&tmp_hdr, 0, sizeof(struct virtio_net_hdr_mrg_rxbuf));
830 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
832 VHOST_LOG_DATA(DEBUG, "(%d) RX: num merge buffers %d\n",
833 dev->vid, num_buffers);
835 if (unlikely(buf_len < dev->vhost_hlen)) {
836 buf_offset = dev->vhost_hlen - buf_len;
838 buf_addr = buf_vec[vec_idx].buf_addr;
839 buf_iova = buf_vec[vec_idx].buf_iova;
840 buf_len = buf_vec[vec_idx].buf_len;
841 buf_avail = buf_len - buf_offset;
843 buf_offset = dev->vhost_hlen;
844 buf_avail = buf_len - dev->vhost_hlen;
847 mbuf_avail = rte_pktmbuf_data_len(m);
849 while (mbuf_avail != 0 || m->next != NULL) {
850 /* done with current buf, get the next one */
851 if (buf_avail == 0) {
853 if (unlikely(vec_idx >= nr_vec)) {
858 buf_addr = buf_vec[vec_idx].buf_addr;
859 buf_iova = buf_vec[vec_idx].buf_iova;
860 buf_len = buf_vec[vec_idx].buf_len;
866 /* done with current mbuf, get the next one */
867 if (mbuf_avail == 0) {
871 mbuf_avail = rte_pktmbuf_data_len(m);
875 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
876 if (rxvq_is_mergeable(dev))
877 ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
880 if (unlikely(hdr == &tmp_hdr)) {
881 copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
883 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
885 vhost_log_cache_write_iova(dev, vq,
893 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
895 if (likely(cpy_len > MAX_BATCH_LEN ||
896 vq->batch_copy_nb_elems >= vq->size)) {
897 rte_memcpy((void *)((uintptr_t)(buf_addr + buf_offset)),
898 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
900 vhost_log_cache_write_iova(dev, vq,
901 buf_iova + buf_offset,
903 PRINT_PACKET(dev, (uintptr_t)(buf_addr + buf_offset),
906 batch_copy[vq->batch_copy_nb_elems].dst =
907 (void *)((uintptr_t)(buf_addr + buf_offset));
908 batch_copy[vq->batch_copy_nb_elems].src =
909 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
910 batch_copy[vq->batch_copy_nb_elems].log_addr =
911 buf_iova + buf_offset;
912 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
913 vq->batch_copy_nb_elems++;
916 mbuf_avail -= cpy_len;
917 mbuf_offset += cpy_len;
918 buf_avail -= cpy_len;
919 buf_offset += cpy_len;
927 static __rte_always_inline void
928 async_fill_vec(struct rte_vhost_iovec *v, void *src, void *dst, size_t len)
935 static __rte_always_inline void
936 async_fill_iter(struct rte_vhost_iov_iter *it, size_t count,
937 struct rte_vhost_iovec *vec, unsigned long nr_seg)
944 it->nr_segs = nr_seg;
951 static __rte_always_inline void
952 async_fill_desc(struct rte_vhost_async_desc *desc, struct rte_vhost_iov_iter *iter)
957 static __rte_always_inline int
958 async_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
959 struct rte_mbuf *m, struct buf_vector *buf_vec,
960 uint16_t nr_vec, uint16_t num_buffers,
961 struct rte_vhost_iovec *iovec, struct rte_vhost_iov_iter *iter)
963 struct rte_mbuf *hdr_mbuf;
964 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
965 uint64_t buf_addr, buf_iova;
968 uint32_t vec_idx = 0;
969 uint32_t mbuf_offset, mbuf_avail;
970 uint32_t buf_offset, buf_avail;
971 uint32_t cpy_len, buf_len;
978 if (unlikely(m == NULL)) {
983 buf_addr = buf_vec[vec_idx].buf_addr;
984 buf_iova = buf_vec[vec_idx].buf_iova;
985 buf_len = buf_vec[vec_idx].buf_len;
987 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
994 if (unlikely(buf_len < dev->vhost_hlen)) {
995 memset(&tmp_hdr, 0, sizeof(struct virtio_net_hdr_mrg_rxbuf));
998 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
1000 VHOST_LOG_DATA(DEBUG, "(%d) RX: num merge buffers %d\n",
1001 dev->vid, num_buffers);
1003 if (unlikely(buf_len < dev->vhost_hlen)) {
1004 buf_offset = dev->vhost_hlen - buf_len;
1006 buf_addr = buf_vec[vec_idx].buf_addr;
1007 buf_iova = buf_vec[vec_idx].buf_iova;
1008 buf_len = buf_vec[vec_idx].buf_len;
1009 buf_avail = buf_len - buf_offset;
1011 buf_offset = dev->vhost_hlen;
1012 buf_avail = buf_len - dev->vhost_hlen;
1015 mbuf_avail = rte_pktmbuf_data_len(m);
1018 while (mbuf_avail != 0 || m->next != NULL) {
1019 /* done with current buf, get the next one */
1020 if (buf_avail == 0) {
1022 if (unlikely(vec_idx >= nr_vec)) {
1027 buf_addr = buf_vec[vec_idx].buf_addr;
1028 buf_iova = buf_vec[vec_idx].buf_iova;
1029 buf_len = buf_vec[vec_idx].buf_len;
1032 buf_avail = buf_len;
1035 /* done with current mbuf, get the next one */
1036 if (mbuf_avail == 0) {
1040 mbuf_avail = rte_pktmbuf_data_len(m);
1044 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
1045 if (rxvq_is_mergeable(dev))
1046 ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
1049 if (unlikely(hdr == &tmp_hdr)) {
1050 copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
1052 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
1053 dev->vhost_hlen, 0);
1054 vhost_log_cache_write_iova(dev, vq,
1055 buf_vec[0].buf_iova,
1062 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
1064 while (unlikely(cpy_len)) {
1065 hpa = (void *)(uintptr_t)gpa_to_first_hpa(dev,
1066 buf_iova + buf_offset,
1067 cpy_len, &mapped_len);
1068 if (unlikely(!hpa)) {
1069 VHOST_LOG_DATA(ERR, "(%d) %s: failed to get hpa.\n",
1070 dev->vid, __func__);
1075 async_fill_vec(iovec + tvec_idx,
1076 (void *)(uintptr_t)rte_pktmbuf_iova_offset(m,
1077 mbuf_offset), hpa, (size_t)mapped_len);
1079 tlen += (uint32_t)mapped_len;
1080 cpy_len -= (uint32_t)mapped_len;
1081 mbuf_avail -= (uint32_t)mapped_len;
1082 mbuf_offset += (uint32_t)mapped_len;
1083 buf_avail -= (uint32_t)mapped_len;
1084 buf_offset += (uint32_t)mapped_len;
1089 async_fill_iter(iter, tlen, iovec, tvec_idx);
1094 static __rte_always_inline int
1095 vhost_enqueue_single_packed(struct virtio_net *dev,
1096 struct vhost_virtqueue *vq,
1097 struct rte_mbuf *pkt,
1098 struct buf_vector *buf_vec,
1101 uint16_t nr_vec = 0;
1102 uint16_t avail_idx = vq->last_avail_idx;
1103 uint16_t max_tries, tries = 0;
1104 uint16_t buf_id = 0;
1106 uint16_t desc_count;
1107 uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
1108 uint16_t num_buffers = 0;
1109 uint32_t buffer_len[vq->size];
1110 uint16_t buffer_buf_id[vq->size];
1111 uint16_t buffer_desc_count[vq->size];
1113 if (rxvq_is_mergeable(dev))
1114 max_tries = vq->size - 1;
1120 * if we tried all available ring items, and still
1121 * can't get enough buf, it means something abnormal
1124 if (unlikely(++tries > max_tries))
1127 if (unlikely(fill_vec_buf_packed(dev, vq,
1128 avail_idx, &desc_count,
1131 VHOST_ACCESS_RW) < 0))
1134 len = RTE_MIN(len, size);
1137 buffer_len[num_buffers] = len;
1138 buffer_buf_id[num_buffers] = buf_id;
1139 buffer_desc_count[num_buffers] = desc_count;
1142 *nr_descs += desc_count;
1143 avail_idx += desc_count;
1144 if (avail_idx >= vq->size)
1145 avail_idx -= vq->size;
1148 if (copy_mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, num_buffers) < 0)
1151 vhost_shadow_enqueue_single_packed(dev, vq, buffer_len, buffer_buf_id,
1152 buffer_desc_count, num_buffers);
1157 static __rte_noinline uint32_t
1158 virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
1159 struct rte_mbuf **pkts, uint32_t count)
1161 uint32_t pkt_idx = 0;
1162 uint16_t num_buffers;
1163 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1164 uint16_t avail_head;
1167 * The ordering between avail index and
1168 * desc reads needs to be enforced.
1170 avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
1172 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1174 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1175 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1176 uint16_t nr_vec = 0;
1178 if (unlikely(reserve_avail_buf_split(dev, vq,
1179 pkt_len, buf_vec, &num_buffers,
1180 avail_head, &nr_vec) < 0)) {
1181 VHOST_LOG_DATA(DEBUG,
1182 "(%d) failed to get enough desc from vring\n",
1184 vq->shadow_used_idx -= num_buffers;
1188 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1189 dev->vid, vq->last_avail_idx,
1190 vq->last_avail_idx + num_buffers);
1192 if (copy_mbuf_to_desc(dev, vq, pkts[pkt_idx],
1195 vq->shadow_used_idx -= num_buffers;
1199 vq->last_avail_idx += num_buffers;
1202 do_data_copy_enqueue(dev, vq);
1204 if (likely(vq->shadow_used_idx)) {
1205 flush_shadow_used_ring_split(dev, vq);
1206 vhost_vring_call_split(dev, vq);
1212 static __rte_always_inline int
1213 virtio_dev_rx_sync_batch_check(struct virtio_net *dev,
1214 struct vhost_virtqueue *vq,
1215 struct rte_mbuf **pkts,
1216 uint64_t *desc_addrs,
1219 bool wrap_counter = vq->avail_wrap_counter;
1220 struct vring_packed_desc *descs = vq->desc_packed;
1221 uint16_t avail_idx = vq->last_avail_idx;
1222 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1225 if (unlikely(avail_idx & PACKED_BATCH_MASK))
1228 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
1231 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1232 if (unlikely(pkts[i]->next != NULL))
1234 if (unlikely(!desc_is_avail(&descs[avail_idx + i],
1239 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1240 lens[i] = descs[avail_idx + i].len;
1242 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1243 if (unlikely(pkts[i]->pkt_len > (lens[i] - buf_offset)))
1247 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1248 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
1249 descs[avail_idx + i].addr,
1253 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1254 if (unlikely(!desc_addrs[i]))
1256 if (unlikely(lens[i] != descs[avail_idx + i].len))
1263 static __rte_always_inline void
1264 virtio_dev_rx_batch_packed_copy(struct virtio_net *dev,
1265 struct vhost_virtqueue *vq,
1266 struct rte_mbuf **pkts,
1267 uint64_t *desc_addrs,
1270 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1271 struct virtio_net_hdr_mrg_rxbuf *hdrs[PACKED_BATCH_SIZE];
1272 struct vring_packed_desc *descs = vq->desc_packed;
1273 uint16_t avail_idx = vq->last_avail_idx;
1274 uint16_t ids[PACKED_BATCH_SIZE];
1277 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1278 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
1279 hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)
1280 (uintptr_t)desc_addrs[i];
1281 lens[i] = pkts[i]->pkt_len +
1282 sizeof(struct virtio_net_hdr_mrg_rxbuf);
1285 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1286 virtio_enqueue_offload(pkts[i], &hdrs[i]->hdr);
1288 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
1290 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1291 rte_memcpy((void *)(uintptr_t)(desc_addrs[i] + buf_offset),
1292 rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
1296 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1297 vhost_log_cache_write_iova(dev, vq, descs[avail_idx + i].addr,
1300 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1301 ids[i] = descs[avail_idx + i].id;
1303 vhost_flush_enqueue_batch_packed(dev, vq, lens, ids);
1306 static __rte_always_inline int
1307 virtio_dev_rx_sync_batch_packed(struct virtio_net *dev,
1308 struct vhost_virtqueue *vq,
1309 struct rte_mbuf **pkts)
1311 uint64_t desc_addrs[PACKED_BATCH_SIZE];
1312 uint64_t lens[PACKED_BATCH_SIZE];
1314 if (virtio_dev_rx_sync_batch_check(dev, vq, pkts, desc_addrs, lens) == -1)
1317 if (vq->shadow_used_idx) {
1318 do_data_copy_enqueue(dev, vq);
1319 vhost_flush_enqueue_shadow_packed(dev, vq);
1322 virtio_dev_rx_batch_packed_copy(dev, vq, pkts, desc_addrs, lens);
1327 static __rte_always_inline int16_t
1328 virtio_dev_rx_single_packed(struct virtio_net *dev,
1329 struct vhost_virtqueue *vq,
1330 struct rte_mbuf *pkt)
1332 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1333 uint16_t nr_descs = 0;
1335 if (unlikely(vhost_enqueue_single_packed(dev, vq, pkt, buf_vec,
1337 VHOST_LOG_DATA(DEBUG,
1338 "(%d) failed to get enough desc from vring\n",
1343 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1344 dev->vid, vq->last_avail_idx,
1345 vq->last_avail_idx + nr_descs);
1347 vq_inc_last_avail_packed(vq, nr_descs);
1352 static __rte_noinline uint32_t
1353 virtio_dev_rx_packed(struct virtio_net *dev,
1354 struct vhost_virtqueue *__rte_restrict vq,
1355 struct rte_mbuf **__rte_restrict pkts,
1358 uint32_t pkt_idx = 0;
1361 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
1363 if (count - pkt_idx >= PACKED_BATCH_SIZE) {
1364 if (!virtio_dev_rx_sync_batch_packed(dev, vq,
1366 pkt_idx += PACKED_BATCH_SIZE;
1371 if (virtio_dev_rx_single_packed(dev, vq, pkts[pkt_idx]))
1375 } while (pkt_idx < count);
1377 if (vq->shadow_used_idx) {
1378 do_data_copy_enqueue(dev, vq);
1379 vhost_flush_enqueue_shadow_packed(dev, vq);
1383 vhost_vring_call_packed(dev, vq);
1388 static __rte_always_inline uint32_t
1389 virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
1390 struct rte_mbuf **pkts, uint32_t count)
1392 struct vhost_virtqueue *vq;
1395 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
1396 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1397 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1398 dev->vid, __func__, queue_id);
1402 vq = dev->virtqueue[queue_id];
1404 rte_spinlock_lock(&vq->access_lock);
1406 if (unlikely(!vq->enabled))
1407 goto out_access_unlock;
1409 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1410 vhost_user_iotlb_rd_lock(vq);
1412 if (unlikely(!vq->access_ok))
1413 if (unlikely(vring_translate(dev, vq) < 0))
1416 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
1420 if (vq_is_packed(dev))
1421 nb_tx = virtio_dev_rx_packed(dev, vq, pkts, count);
1423 nb_tx = virtio_dev_rx_split(dev, vq, pkts, count);
1426 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1427 vhost_user_iotlb_rd_unlock(vq);
1430 rte_spinlock_unlock(&vq->access_lock);
1436 rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
1437 struct rte_mbuf **__rte_restrict pkts, uint16_t count)
1439 struct virtio_net *dev = get_device(vid);
1444 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
1446 "(%d) %s: built-in vhost net backend is disabled.\n",
1447 dev->vid, __func__);
1451 return virtio_dev_rx(dev, queue_id, pkts, count);
1454 static __rte_always_inline uint16_t
1455 virtio_dev_rx_async_get_info_idx(uint16_t pkts_idx,
1456 uint16_t vq_size, uint16_t n_inflight)
1458 return pkts_idx > n_inflight ? (pkts_idx - n_inflight) :
1459 (vq_size - n_inflight + pkts_idx) % vq_size;
1462 static __rte_always_inline void
1463 store_dma_desc_info_split(struct vring_used_elem *s_ring, struct vring_used_elem *d_ring,
1464 uint16_t ring_size, uint16_t s_idx, uint16_t d_idx, uint16_t count)
1466 size_t elem_size = sizeof(struct vring_used_elem);
1468 if (d_idx + count <= ring_size) {
1469 rte_memcpy(d_ring + d_idx, s_ring + s_idx, count * elem_size);
1471 uint16_t size = ring_size - d_idx;
1473 rte_memcpy(d_ring + d_idx, s_ring + s_idx, size * elem_size);
1474 rte_memcpy(d_ring, s_ring + s_idx + size, (count - size) * elem_size);
1478 static __rte_always_inline void
1479 store_dma_desc_info_packed(struct vring_used_elem_packed *s_ring,
1480 struct vring_used_elem_packed *d_ring,
1481 uint16_t ring_size, uint16_t s_idx, uint16_t d_idx, uint16_t count)
1483 size_t elem_size = sizeof(struct vring_used_elem_packed);
1485 if (d_idx + count <= ring_size) {
1486 rte_memcpy(d_ring + d_idx, s_ring + s_idx, count * elem_size);
1488 uint16_t size = ring_size - d_idx;
1490 rte_memcpy(d_ring + d_idx, s_ring + s_idx, size * elem_size);
1491 rte_memcpy(d_ring, s_ring + s_idx + size, (count - size) * elem_size);
1495 static __rte_noinline uint32_t
1496 virtio_dev_rx_async_submit_split(struct virtio_net *dev,
1497 struct vhost_virtqueue *vq, uint16_t queue_id,
1498 struct rte_mbuf **pkts, uint32_t count)
1500 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1501 uint32_t pkt_idx = 0, pkt_burst_idx = 0;
1502 uint16_t num_buffers;
1503 uint16_t avail_head;
1505 struct vhost_async *async = vq->async;
1506 struct rte_vhost_iov_iter *iter = async->iov_iter;
1507 struct rte_vhost_async_desc tdes[MAX_PKT_BURST];
1508 struct rte_vhost_iovec *iovec = async->iovec;
1509 struct async_inflight_info *pkts_info = async->pkts_info;
1510 uint32_t n_pkts = 0, pkt_err = 0;
1512 uint16_t iovec_idx = 0, it_idx = 0, slot_idx = 0;
1515 * The ordering between avail index and desc reads need to be enforced.
1517 avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
1519 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1521 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1522 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1523 uint16_t nr_vec = 0;
1525 if (unlikely(reserve_avail_buf_split(dev, vq,
1526 pkt_len, buf_vec, &num_buffers,
1527 avail_head, &nr_vec) < 0)) {
1528 VHOST_LOG_DATA(DEBUG,
1529 "(%d) failed to get enough desc from vring\n",
1531 vq->shadow_used_idx -= num_buffers;
1535 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1536 dev->vid, vq->last_avail_idx,
1537 vq->last_avail_idx + num_buffers);
1539 if (async_mbuf_to_desc(dev, vq, pkts[pkt_idx], buf_vec, nr_vec, num_buffers,
1540 &iovec[iovec_idx], &iter[it_idx]) < 0) {
1541 vq->shadow_used_idx -= num_buffers;
1545 async_fill_desc(&tdes[pkt_burst_idx++], &iter[it_idx]);
1547 slot_idx = (async->pkts_idx + pkt_idx) & (vq->size - 1);
1548 pkts_info[slot_idx].descs = num_buffers;
1549 pkts_info[slot_idx].mbuf = pkts[pkt_idx];
1551 iovec_idx += iter[it_idx].nr_segs;
1554 vq->last_avail_idx += num_buffers;
1557 * condition to trigger async device transfer:
1558 * - unused async iov number is less than max vhost vector
1560 if (unlikely(VHOST_MAX_ASYNC_VEC - iovec_idx < BUF_VECTOR_MAX)) {
1561 n_xfer = async->ops.transfer_data(dev->vid,
1562 queue_id, tdes, 0, pkt_burst_idx);
1563 if (likely(n_xfer >= 0)) {
1567 "(%d) %s: failed to transfer data for queue id %d.\n",
1568 dev->vid, __func__, queue_id);
1575 if (unlikely(n_pkts < pkt_burst_idx)) {
1577 * log error packets number here and do actual
1578 * error processing when applications poll
1581 pkt_err = pkt_burst_idx - n_pkts;
1591 if (pkt_burst_idx) {
1592 n_xfer = async->ops.transfer_data(dev->vid, queue_id, tdes, 0, pkt_burst_idx);
1593 if (likely(n_xfer >= 0)) {
1596 VHOST_LOG_DATA(ERR, "(%d) %s: failed to transfer data for queue id %d.\n",
1597 dev->vid, __func__, queue_id);
1601 if (unlikely(n_pkts < pkt_burst_idx))
1602 pkt_err = pkt_burst_idx - n_pkts;
1605 if (unlikely(pkt_err)) {
1606 uint16_t num_descs = 0;
1608 /* update number of completed packets */
1611 /* calculate the sum of descriptors to revert */
1612 while (pkt_err-- > 0) {
1613 num_descs += pkts_info[slot_idx & (vq->size - 1)].descs;
1617 /* recover shadow used ring and available ring */
1618 vq->shadow_used_idx -= num_descs;
1619 vq->last_avail_idx -= num_descs;
1622 /* keep used descriptors */
1623 if (likely(vq->shadow_used_idx)) {
1624 uint16_t to = async->desc_idx_split & (vq->size - 1);
1626 store_dma_desc_info_split(vq->shadow_used_split,
1627 async->descs_split, vq->size, 0, to,
1628 vq->shadow_used_idx);
1630 async->desc_idx_split += vq->shadow_used_idx;
1631 async->pkts_idx += pkt_idx;
1632 async->pkts_inflight_n += pkt_idx;
1633 vq->shadow_used_idx = 0;
1639 static __rte_always_inline void
1640 vhost_update_used_packed(struct vhost_virtqueue *vq,
1641 struct vring_used_elem_packed *shadow_ring,
1645 uint16_t used_idx = vq->last_used_idx;
1646 uint16_t head_idx = vq->last_used_idx;
1647 uint16_t head_flags = 0;
1652 /* Split loop in two to save memory barriers */
1653 for (i = 0; i < count; i++) {
1654 vq->desc_packed[used_idx].id = shadow_ring[i].id;
1655 vq->desc_packed[used_idx].len = shadow_ring[i].len;
1657 used_idx += shadow_ring[i].count;
1658 if (used_idx >= vq->size)
1659 used_idx -= vq->size;
1662 /* The ordering for storing desc flags needs to be enforced. */
1663 rte_atomic_thread_fence(__ATOMIC_RELEASE);
1665 for (i = 0; i < count; i++) {
1668 if (vq->shadow_used_packed[i].len)
1669 flags = VRING_DESC_F_WRITE;
1673 if (vq->used_wrap_counter) {
1674 flags |= VRING_DESC_F_USED;
1675 flags |= VRING_DESC_F_AVAIL;
1677 flags &= ~VRING_DESC_F_USED;
1678 flags &= ~VRING_DESC_F_AVAIL;
1682 vq->desc_packed[vq->last_used_idx].flags = flags;
1684 head_idx = vq->last_used_idx;
1688 vq_inc_last_used_packed(vq, shadow_ring[i].count);
1691 vq->desc_packed[head_idx].flags = head_flags;
1694 static __rte_always_inline int
1695 vhost_enqueue_async_packed(struct virtio_net *dev,
1696 struct vhost_virtqueue *vq,
1697 struct rte_mbuf *pkt,
1698 struct buf_vector *buf_vec,
1700 uint16_t *nr_buffers,
1701 struct rte_vhost_iovec *iovec,
1702 struct rte_vhost_iov_iter *iter)
1704 uint16_t nr_vec = 0;
1705 uint16_t avail_idx = vq->last_avail_idx;
1706 uint16_t max_tries, tries = 0;
1707 uint16_t buf_id = 0;
1709 uint16_t desc_count = 0;
1710 uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
1711 uint32_t buffer_len[vq->size];
1712 uint16_t buffer_buf_id[vq->size];
1713 uint16_t buffer_desc_count[vq->size];
1715 if (rxvq_is_mergeable(dev))
1716 max_tries = vq->size - 1;
1722 * if we tried all available ring items, and still
1723 * can't get enough buf, it means something abnormal
1726 if (unlikely(++tries > max_tries))
1729 if (unlikely(fill_vec_buf_packed(dev, vq,
1730 avail_idx, &desc_count,
1733 VHOST_ACCESS_RW) < 0))
1736 len = RTE_MIN(len, size);
1739 buffer_len[*nr_buffers] = len;
1740 buffer_buf_id[*nr_buffers] = buf_id;
1741 buffer_desc_count[*nr_buffers] = desc_count;
1743 *nr_descs += desc_count;
1744 avail_idx += desc_count;
1745 if (avail_idx >= vq->size)
1746 avail_idx -= vq->size;
1749 if (unlikely(async_mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec,
1750 *nr_buffers, iovec, iter) < 0))
1753 vhost_shadow_enqueue_packed(vq, buffer_len, buffer_buf_id, buffer_desc_count, *nr_buffers);
1758 static __rte_always_inline int16_t
1759 virtio_dev_rx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
1760 struct rte_mbuf *pkt, uint16_t *nr_descs, uint16_t *nr_buffers,
1761 struct rte_vhost_iovec *iovec, struct rte_vhost_iov_iter *iter)
1763 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1765 if (unlikely(vhost_enqueue_async_packed(dev, vq, pkt, buf_vec, nr_descs, nr_buffers,
1766 iovec, iter) < 0)) {
1767 VHOST_LOG_DATA(DEBUG, "(%d) failed to get enough desc from vring\n", dev->vid);
1771 VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
1772 dev->vid, vq->last_avail_idx, vq->last_avail_idx + *nr_descs);
1777 static __rte_always_inline void
1778 dma_error_handler_packed(struct vhost_virtqueue *vq, uint16_t slot_idx,
1779 uint32_t nr_err, uint32_t *pkt_idx)
1781 uint16_t descs_err = 0;
1782 uint16_t buffers_err = 0;
1783 struct async_inflight_info *pkts_info = vq->async->pkts_info;
1786 /* calculate the sum of buffers and descs of DMA-error packets. */
1787 while (nr_err-- > 0) {
1788 descs_err += pkts_info[slot_idx % vq->size].descs;
1789 buffers_err += pkts_info[slot_idx % vq->size].nr_buffers;
1793 if (vq->last_avail_idx >= descs_err) {
1794 vq->last_avail_idx -= descs_err;
1796 vq->last_avail_idx = vq->last_avail_idx + vq->size - descs_err;
1797 vq->avail_wrap_counter ^= 1;
1800 vq->shadow_used_idx -= buffers_err;
1803 static __rte_noinline uint32_t
1804 virtio_dev_rx_async_submit_packed(struct virtio_net *dev,
1805 struct vhost_virtqueue *vq, uint16_t queue_id,
1806 struct rte_mbuf **pkts, uint32_t count)
1808 uint32_t pkt_idx = 0, pkt_burst_idx = 0;
1809 uint32_t remained = count;
1811 uint16_t num_buffers;
1814 struct vhost_async *async = vq->async;
1815 struct rte_vhost_iov_iter *iter = async->iov_iter;
1816 struct rte_vhost_async_desc tdes[MAX_PKT_BURST];
1817 struct rte_vhost_iovec *iovec = async->iovec;
1818 struct async_inflight_info *pkts_info = async->pkts_info;
1819 uint32_t n_pkts = 0, pkt_err = 0;
1820 uint16_t slot_idx = 0;
1821 uint16_t iovec_idx = 0, it_idx = 0;
1824 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
1828 if (unlikely(virtio_dev_rx_async_packed(dev, vq, pkts[pkt_idx],
1829 &num_descs, &num_buffers,
1830 &iovec[iovec_idx], &iter[it_idx]) < 0))
1833 slot_idx = (async->pkts_idx + pkt_idx) % vq->size;
1835 async_fill_desc(&tdes[pkt_burst_idx++], &iter[it_idx]);
1836 pkts_info[slot_idx].descs = num_descs;
1837 pkts_info[slot_idx].nr_buffers = num_buffers;
1838 pkts_info[slot_idx].mbuf = pkts[pkt_idx];
1839 iovec_idx += iter[it_idx].nr_segs;
1844 vq_inc_last_avail_packed(vq, num_descs);
1847 * condition to trigger async device transfer:
1848 * - unused async iov number is less than max vhost vector
1850 if (unlikely(VHOST_MAX_ASYNC_VEC - iovec_idx < BUF_VECTOR_MAX)) {
1851 n_xfer = async->ops.transfer_data(dev->vid,
1852 queue_id, tdes, 0, pkt_burst_idx);
1853 if (likely(n_xfer >= 0)) {
1857 "(%d) %s: failed to transfer data for queue id %d.\n",
1858 dev->vid, __func__, queue_id);
1865 if (unlikely(n_pkts < pkt_burst_idx)) {
1867 * log error packets number here and do actual
1868 * error processing when applications poll
1871 pkt_err = pkt_burst_idx - n_pkts;
1878 } while (pkt_idx < count);
1880 if (pkt_burst_idx) {
1881 n_xfer = async->ops.transfer_data(dev->vid, queue_id, tdes, 0, pkt_burst_idx);
1882 if (likely(n_xfer >= 0)) {
1885 VHOST_LOG_DATA(ERR, "(%d) %s: failed to transfer data for queue id %d.\n",
1886 dev->vid, __func__, queue_id);
1890 if (unlikely(n_pkts < pkt_burst_idx))
1891 pkt_err = pkt_burst_idx - n_pkts;
1894 if (unlikely(pkt_err))
1895 dma_error_handler_packed(vq, slot_idx, pkt_err, &pkt_idx);
1897 if (likely(vq->shadow_used_idx)) {
1898 /* keep used descriptors. */
1899 store_dma_desc_info_packed(vq->shadow_used_packed, async->buffers_packed,
1900 vq->size, 0, async->buffer_idx_packed,
1901 vq->shadow_used_idx);
1903 async->buffer_idx_packed += vq->shadow_used_idx;
1904 if (async->buffer_idx_packed >= vq->size)
1905 async->buffer_idx_packed -= vq->size;
1907 async->pkts_idx += pkt_idx;
1908 if (async->pkts_idx >= vq->size)
1909 async->pkts_idx -= vq->size;
1911 vq->shadow_used_idx = 0;
1912 async->pkts_inflight_n += pkt_idx;
1918 static __rte_always_inline void
1919 write_back_completed_descs_split(struct vhost_virtqueue *vq, uint16_t n_descs)
1921 struct vhost_async *async = vq->async;
1922 uint16_t nr_left = n_descs;
1927 from = async->last_desc_idx_split & (vq->size - 1);
1928 nr_copy = nr_left + from <= vq->size ? nr_left : vq->size - from;
1929 to = vq->last_used_idx & (vq->size - 1);
1931 if (to + nr_copy <= vq->size) {
1932 rte_memcpy(&vq->used->ring[to], &async->descs_split[from],
1933 nr_copy * sizeof(struct vring_used_elem));
1935 uint16_t size = vq->size - to;
1937 rte_memcpy(&vq->used->ring[to], &async->descs_split[from],
1938 size * sizeof(struct vring_used_elem));
1939 rte_memcpy(&vq->used->ring[0], &async->descs_split[from + size],
1940 (nr_copy - size) * sizeof(struct vring_used_elem));
1943 async->last_desc_idx_split += nr_copy;
1944 vq->last_used_idx += nr_copy;
1946 } while (nr_left > 0);
1949 static __rte_always_inline void
1950 write_back_completed_descs_packed(struct vhost_virtqueue *vq,
1953 struct vhost_async *async = vq->async;
1954 uint16_t nr_left = n_buffers;
1958 from = async->last_buffer_idx_packed;
1959 to = (from + nr_left) % vq->size;
1961 vhost_update_used_packed(vq, async->buffers_packed + from, to - from);
1962 async->last_buffer_idx_packed += nr_left;
1965 vhost_update_used_packed(vq, async->buffers_packed + from,
1967 async->last_buffer_idx_packed = 0;
1968 nr_left -= vq->size - from;
1970 } while (nr_left > 0);
1973 static __rte_always_inline uint16_t
1974 vhost_poll_enqueue_completed(struct virtio_net *dev, uint16_t queue_id,
1975 struct rte_mbuf **pkts, uint16_t count)
1977 struct vhost_virtqueue *vq;
1978 struct vhost_async *async;
1979 struct async_inflight_info *pkts_info;
1981 uint16_t n_pkts_cpl = 0, n_pkts_put = 0, n_descs = 0, n_buffers = 0;
1982 uint16_t start_idx, pkts_idx, vq_size;
1985 vq = dev->virtqueue[queue_id];
1987 pkts_idx = async->pkts_idx % vq->size;
1988 pkts_info = async->pkts_info;
1990 start_idx = virtio_dev_rx_async_get_info_idx(pkts_idx,
1991 vq_size, async->pkts_inflight_n);
1993 if (count > async->last_pkts_n) {
1994 n_cpl = async->ops.check_completed_copies(dev->vid,
1995 queue_id, 0, count - async->last_pkts_n);
1996 if (likely(n_cpl >= 0)) {
2000 "(%d) %s: failed to check completed copies for queue id %d.\n",
2001 dev->vid, __func__, queue_id);
2006 n_pkts_cpl += async->last_pkts_n;
2007 n_pkts_put = RTE_MIN(n_pkts_cpl, count);
2008 if (unlikely(n_pkts_put == 0)) {
2009 async->last_pkts_n = n_pkts_cpl;
2013 if (vq_is_packed(dev)) {
2014 for (i = 0; i < n_pkts_put; i++) {
2015 from = (start_idx + i) % vq_size;
2016 n_buffers += pkts_info[from].nr_buffers;
2017 pkts[i] = pkts_info[from].mbuf;
2020 for (i = 0; i < n_pkts_put; i++) {
2021 from = (start_idx + i) & (vq_size - 1);
2022 n_descs += pkts_info[from].descs;
2023 pkts[i] = pkts_info[from].mbuf;
2026 async->last_pkts_n = n_pkts_cpl - n_pkts_put;
2027 async->pkts_inflight_n -= n_pkts_put;
2029 if (likely(vq->enabled && vq->access_ok)) {
2030 if (vq_is_packed(dev)) {
2031 write_back_completed_descs_packed(vq, n_buffers);
2033 vhost_vring_call_packed(dev, vq);
2035 write_back_completed_descs_split(vq, n_descs);
2037 __atomic_add_fetch(&vq->used->idx, n_descs,
2039 vhost_vring_call_split(dev, vq);
2042 if (vq_is_packed(dev)) {
2043 async->last_buffer_idx_packed += n_buffers;
2044 if (async->last_buffer_idx_packed >= vq->size)
2045 async->last_buffer_idx_packed -= vq->size;
2047 async->last_desc_idx_split += n_descs;
2055 rte_vhost_poll_enqueue_completed(int vid, uint16_t queue_id,
2056 struct rte_mbuf **pkts, uint16_t count)
2058 struct virtio_net *dev = get_device(vid);
2059 struct vhost_virtqueue *vq;
2060 uint16_t n_pkts_cpl = 0;
2065 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
2066 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
2067 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
2068 dev->vid, __func__, queue_id);
2072 vq = dev->virtqueue[queue_id];
2074 if (unlikely(!vq->async)) {
2075 VHOST_LOG_DATA(ERR, "(%d) %s: async not registered for queue id %d.\n",
2076 dev->vid, __func__, queue_id);
2080 rte_spinlock_lock(&vq->access_lock);
2082 n_pkts_cpl = vhost_poll_enqueue_completed(dev, queue_id, pkts, count);
2084 rte_spinlock_unlock(&vq->access_lock);
2090 rte_vhost_clear_queue_thread_unsafe(int vid, uint16_t queue_id,
2091 struct rte_mbuf **pkts, uint16_t count)
2093 struct virtio_net *dev = get_device(vid);
2094 struct vhost_virtqueue *vq;
2095 uint16_t n_pkts_cpl = 0;
2100 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
2101 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
2102 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
2103 dev->vid, __func__, queue_id);
2107 vq = dev->virtqueue[queue_id];
2109 if (unlikely(!vq->async)) {
2110 VHOST_LOG_DATA(ERR, "(%d) %s: async not registered for queue id %d.\n",
2111 dev->vid, __func__, queue_id);
2115 n_pkts_cpl = vhost_poll_enqueue_completed(dev, queue_id, pkts, count);
2120 static __rte_always_inline uint32_t
2121 virtio_dev_rx_async_submit(struct virtio_net *dev, uint16_t queue_id,
2122 struct rte_mbuf **pkts, uint32_t count)
2124 struct vhost_virtqueue *vq;
2127 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
2128 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
2129 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
2130 dev->vid, __func__, queue_id);
2134 vq = dev->virtqueue[queue_id];
2136 rte_spinlock_lock(&vq->access_lock);
2138 if (unlikely(!vq->enabled || !vq->async))
2139 goto out_access_unlock;
2141 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2142 vhost_user_iotlb_rd_lock(vq);
2144 if (unlikely(!vq->access_ok))
2145 if (unlikely(vring_translate(dev, vq) < 0))
2148 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
2152 if (vq_is_packed(dev))
2153 nb_tx = virtio_dev_rx_async_submit_packed(dev, vq, queue_id,
2156 nb_tx = virtio_dev_rx_async_submit_split(dev, vq, queue_id,
2160 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2161 vhost_user_iotlb_rd_unlock(vq);
2164 rte_spinlock_unlock(&vq->access_lock);
2170 rte_vhost_submit_enqueue_burst(int vid, uint16_t queue_id,
2171 struct rte_mbuf **pkts, uint16_t count)
2173 struct virtio_net *dev = get_device(vid);
2178 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
2180 "(%d) %s: built-in vhost net backend is disabled.\n",
2181 dev->vid, __func__);
2185 return virtio_dev_rx_async_submit(dev, queue_id, pkts, count);
2189 virtio_net_with_host_offload(struct virtio_net *dev)
2192 ((1ULL << VIRTIO_NET_F_CSUM) |
2193 (1ULL << VIRTIO_NET_F_HOST_ECN) |
2194 (1ULL << VIRTIO_NET_F_HOST_TSO4) |
2195 (1ULL << VIRTIO_NET_F_HOST_TSO6) |
2196 (1ULL << VIRTIO_NET_F_HOST_UFO)))
2203 parse_headers(struct rte_mbuf *m, uint8_t *l4_proto)
2205 struct rte_ipv4_hdr *ipv4_hdr;
2206 struct rte_ipv6_hdr *ipv6_hdr;
2207 struct rte_ether_hdr *eth_hdr;
2209 uint16_t data_len = rte_pktmbuf_data_len(m);
2211 if (data_len < sizeof(struct rte_ether_hdr))
2214 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
2216 m->l2_len = sizeof(struct rte_ether_hdr);
2217 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
2219 if (ethertype == RTE_ETHER_TYPE_VLAN) {
2220 if (data_len < sizeof(struct rte_ether_hdr) +
2221 sizeof(struct rte_vlan_hdr))
2224 struct rte_vlan_hdr *vlan_hdr =
2225 (struct rte_vlan_hdr *)(eth_hdr + 1);
2227 m->l2_len += sizeof(struct rte_vlan_hdr);
2228 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
2231 switch (ethertype) {
2232 case RTE_ETHER_TYPE_IPV4:
2233 if (data_len < m->l2_len + sizeof(struct rte_ipv4_hdr))
2235 ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv4_hdr *,
2237 m->l3_len = rte_ipv4_hdr_len(ipv4_hdr);
2238 if (data_len < m->l2_len + m->l3_len)
2240 m->ol_flags |= RTE_MBUF_F_TX_IPV4;
2241 *l4_proto = ipv4_hdr->next_proto_id;
2243 case RTE_ETHER_TYPE_IPV6:
2244 if (data_len < m->l2_len + sizeof(struct rte_ipv6_hdr))
2246 ipv6_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv6_hdr *,
2248 m->l3_len = sizeof(struct rte_ipv6_hdr);
2249 m->ol_flags |= RTE_MBUF_F_TX_IPV6;
2250 *l4_proto = ipv6_hdr->proto;
2253 /* a valid L3 header is needed for further L4 parsing */
2257 /* both CSUM and GSO need a valid L4 header */
2258 switch (*l4_proto) {
2260 if (data_len < m->l2_len + m->l3_len +
2261 sizeof(struct rte_tcp_hdr))
2265 if (data_len < m->l2_len + m->l3_len +
2266 sizeof(struct rte_udp_hdr))
2270 if (data_len < m->l2_len + m->l3_len +
2271 sizeof(struct rte_sctp_hdr))
2287 static __rte_always_inline void
2288 vhost_dequeue_offload_legacy(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
2290 uint8_t l4_proto = 0;
2291 struct rte_tcp_hdr *tcp_hdr = NULL;
2293 uint16_t data_len = rte_pktmbuf_data_len(m);
2295 if (parse_headers(m, &l4_proto) < 0)
2298 if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2299 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
2300 switch (hdr->csum_offset) {
2301 case (offsetof(struct rte_tcp_hdr, cksum)):
2302 if (l4_proto != IPPROTO_TCP)
2304 m->ol_flags |= RTE_MBUF_F_TX_TCP_CKSUM;
2306 case (offsetof(struct rte_udp_hdr, dgram_cksum)):
2307 if (l4_proto != IPPROTO_UDP)
2309 m->ol_flags |= RTE_MBUF_F_TX_UDP_CKSUM;
2311 case (offsetof(struct rte_sctp_hdr, cksum)):
2312 if (l4_proto != IPPROTO_SCTP)
2314 m->ol_flags |= RTE_MBUF_F_TX_SCTP_CKSUM;
2324 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2325 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2326 case VIRTIO_NET_HDR_GSO_TCPV4:
2327 case VIRTIO_NET_HDR_GSO_TCPV6:
2328 if (l4_proto != IPPROTO_TCP)
2330 tcp_hdr = rte_pktmbuf_mtod_offset(m,
2331 struct rte_tcp_hdr *,
2332 m->l2_len + m->l3_len);
2333 tcp_len = (tcp_hdr->data_off & 0xf0) >> 2;
2334 if (data_len < m->l2_len + m->l3_len + tcp_len)
2336 m->ol_flags |= RTE_MBUF_F_TX_TCP_SEG;
2337 m->tso_segsz = hdr->gso_size;
2338 m->l4_len = tcp_len;
2340 case VIRTIO_NET_HDR_GSO_UDP:
2341 if (l4_proto != IPPROTO_UDP)
2343 m->ol_flags |= RTE_MBUF_F_TX_UDP_SEG;
2344 m->tso_segsz = hdr->gso_size;
2345 m->l4_len = sizeof(struct rte_udp_hdr);
2348 VHOST_LOG_DATA(WARNING,
2349 "unsupported gso type %u.\n", hdr->gso_type);
2361 static __rte_always_inline void
2362 vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m,
2363 bool legacy_ol_flags)
2365 struct rte_net_hdr_lens hdr_lens;
2366 int l4_supported = 0;
2369 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
2372 if (legacy_ol_flags) {
2373 vhost_dequeue_offload_legacy(hdr, m);
2377 m->ol_flags |= RTE_MBUF_F_RX_IP_CKSUM_UNKNOWN;
2379 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
2380 m->packet_type = ptype;
2381 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
2382 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
2383 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
2386 /* According to Virtio 1.1 spec, the device only needs to look at
2387 * VIRTIO_NET_HDR_F_NEEDS_CSUM in the packet transmission path.
2388 * This differs from the processing incoming packets path where the
2389 * driver could rely on VIRTIO_NET_HDR_F_DATA_VALID flag set by the
2392 * 5.1.6.2.1 Driver Requirements: Packet Transmission
2393 * The driver MUST NOT set the VIRTIO_NET_HDR_F_DATA_VALID and
2394 * VIRTIO_NET_HDR_F_RSC_INFO bits in flags.
2396 * 5.1.6.2.2 Device Requirements: Packet Transmission
2397 * The device MUST ignore flag bits that it does not recognize.
2399 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2402 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
2403 if (hdr->csum_start <= hdrlen && l4_supported != 0) {
2404 m->ol_flags |= RTE_MBUF_F_RX_L4_CKSUM_NONE;
2406 /* Unknown proto or tunnel, do sw cksum. We can assume
2407 * the cksum field is in the first segment since the
2408 * buffers we provided to the host are large enough.
2409 * In case of SCTP, this will be wrong since it's a CRC
2410 * but there's nothing we can do.
2412 uint16_t csum = 0, off;
2414 if (rte_raw_cksum_mbuf(m, hdr->csum_start,
2415 rte_pktmbuf_pkt_len(m) - hdr->csum_start, &csum) < 0)
2417 if (likely(csum != 0xffff))
2419 off = hdr->csum_offset + hdr->csum_start;
2420 if (rte_pktmbuf_data_len(m) >= off + 1)
2421 *rte_pktmbuf_mtod_offset(m, uint16_t *, off) = csum;
2425 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2426 if (hdr->gso_size == 0)
2429 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2430 case VIRTIO_NET_HDR_GSO_TCPV4:
2431 case VIRTIO_NET_HDR_GSO_TCPV6:
2432 if ((ptype & RTE_PTYPE_L4_MASK) != RTE_PTYPE_L4_TCP)
2434 m->ol_flags |= RTE_MBUF_F_RX_LRO | RTE_MBUF_F_RX_L4_CKSUM_NONE;
2435 m->tso_segsz = hdr->gso_size;
2437 case VIRTIO_NET_HDR_GSO_UDP:
2438 if ((ptype & RTE_PTYPE_L4_MASK) != RTE_PTYPE_L4_UDP)
2440 m->ol_flags |= RTE_MBUF_F_RX_LRO | RTE_MBUF_F_RX_L4_CKSUM_NONE;
2441 m->tso_segsz = hdr->gso_size;
2449 static __rte_noinline void
2450 copy_vnet_hdr_from_desc(struct virtio_net_hdr *hdr,
2451 struct buf_vector *buf_vec)
2454 uint64_t remain = sizeof(struct virtio_net_hdr);
2456 uint64_t dst = (uint64_t)(uintptr_t)hdr;
2459 len = RTE_MIN(remain, buf_vec->buf_len);
2460 src = buf_vec->buf_addr;
2461 rte_memcpy((void *)(uintptr_t)dst,
2462 (void *)(uintptr_t)src, len);
2470 static __rte_always_inline int
2471 copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
2472 struct buf_vector *buf_vec, uint16_t nr_vec,
2473 struct rte_mbuf *m, struct rte_mempool *mbuf_pool,
2474 bool legacy_ol_flags)
2476 uint32_t buf_avail, buf_offset;
2477 uint64_t buf_addr, buf_len;
2478 uint32_t mbuf_avail, mbuf_offset;
2480 struct rte_mbuf *cur = m, *prev = m;
2481 struct virtio_net_hdr tmp_hdr;
2482 struct virtio_net_hdr *hdr = NULL;
2483 /* A counter to avoid desc dead loop chain */
2484 uint16_t vec_idx = 0;
2485 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
2488 buf_addr = buf_vec[vec_idx].buf_addr;
2489 buf_len = buf_vec[vec_idx].buf_len;
2491 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
2496 if (virtio_net_with_host_offload(dev)) {
2497 if (unlikely(buf_len < sizeof(struct virtio_net_hdr))) {
2499 * No luck, the virtio-net header doesn't fit
2500 * in a contiguous virtual area.
2502 copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec);
2505 hdr = (struct virtio_net_hdr *)((uintptr_t)buf_addr);
2510 * A virtio driver normally uses at least 2 desc buffers
2511 * for Tx: the first for storing the header, and others
2512 * for storing the data.
2514 if (unlikely(buf_len < dev->vhost_hlen)) {
2515 buf_offset = dev->vhost_hlen - buf_len;
2517 buf_addr = buf_vec[vec_idx].buf_addr;
2518 buf_len = buf_vec[vec_idx].buf_len;
2519 buf_avail = buf_len - buf_offset;
2520 } else if (buf_len == dev->vhost_hlen) {
2521 if (unlikely(++vec_idx >= nr_vec))
2523 buf_addr = buf_vec[vec_idx].buf_addr;
2524 buf_len = buf_vec[vec_idx].buf_len;
2527 buf_avail = buf_len;
2529 buf_offset = dev->vhost_hlen;
2530 buf_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
2534 (uintptr_t)(buf_addr + buf_offset),
2535 (uint32_t)buf_avail, 0);
2538 mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
2540 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
2542 if (likely(cpy_len > MAX_BATCH_LEN ||
2543 vq->batch_copy_nb_elems >= vq->size ||
2544 (hdr && cur == m))) {
2545 rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
2547 (void *)((uintptr_t)(buf_addr +
2548 buf_offset)), cpy_len);
2550 batch_copy[vq->batch_copy_nb_elems].dst =
2551 rte_pktmbuf_mtod_offset(cur, void *,
2553 batch_copy[vq->batch_copy_nb_elems].src =
2554 (void *)((uintptr_t)(buf_addr + buf_offset));
2555 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
2556 vq->batch_copy_nb_elems++;
2559 mbuf_avail -= cpy_len;
2560 mbuf_offset += cpy_len;
2561 buf_avail -= cpy_len;
2562 buf_offset += cpy_len;
2564 /* This buf reaches to its end, get the next one */
2565 if (buf_avail == 0) {
2566 if (++vec_idx >= nr_vec)
2569 buf_addr = buf_vec[vec_idx].buf_addr;
2570 buf_len = buf_vec[vec_idx].buf_len;
2573 buf_avail = buf_len;
2575 PRINT_PACKET(dev, (uintptr_t)buf_addr,
2576 (uint32_t)buf_avail, 0);
2580 * This mbuf reaches to its end, get a new one
2581 * to hold more data.
2583 if (mbuf_avail == 0) {
2584 cur = rte_pktmbuf_alloc(mbuf_pool);
2585 if (unlikely(cur == NULL)) {
2586 VHOST_LOG_DATA(ERR, "Failed to "
2587 "allocate memory for mbuf.\n");
2593 prev->data_len = mbuf_offset;
2595 m->pkt_len += mbuf_offset;
2599 mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
2603 prev->data_len = mbuf_offset;
2604 m->pkt_len += mbuf_offset;
2607 vhost_dequeue_offload(hdr, m, legacy_ol_flags);
2615 virtio_dev_extbuf_free(void *addr __rte_unused, void *opaque)
2621 virtio_dev_extbuf_alloc(struct rte_mbuf *pkt, uint32_t size)
2623 struct rte_mbuf_ext_shared_info *shinfo = NULL;
2624 uint32_t total_len = RTE_PKTMBUF_HEADROOM + size;
2629 total_len += sizeof(*shinfo) + sizeof(uintptr_t);
2630 total_len = RTE_ALIGN_CEIL(total_len, sizeof(uintptr_t));
2632 if (unlikely(total_len > UINT16_MAX))
2635 buf_len = total_len;
2636 buf = rte_malloc(NULL, buf_len, RTE_CACHE_LINE_SIZE);
2637 if (unlikely(buf == NULL))
2640 /* Initialize shinfo */
2641 shinfo = rte_pktmbuf_ext_shinfo_init_helper(buf, &buf_len,
2642 virtio_dev_extbuf_free, buf);
2643 if (unlikely(shinfo == NULL)) {
2645 VHOST_LOG_DATA(ERR, "Failed to init shinfo\n");
2649 iova = rte_malloc_virt2iova(buf);
2650 rte_pktmbuf_attach_extbuf(pkt, buf, iova, buf_len, shinfo);
2651 rte_pktmbuf_reset_headroom(pkt);
2657 * Prepare a host supported pktmbuf.
2659 static __rte_always_inline int
2660 virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
2663 if (rte_pktmbuf_tailroom(pkt) >= data_len)
2666 /* attach an external buffer if supported */
2667 if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
2670 /* check if chained buffers are allowed */
2671 if (!dev->linearbuf)
2679 virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
2680 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count,
2681 bool legacy_ol_flags)
2684 uint16_t free_entries;
2685 uint16_t dropped = 0;
2686 static bool allocerr_warned;
2689 * The ordering between avail index and
2690 * desc reads needs to be enforced.
2692 free_entries = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE) -
2694 if (free_entries == 0)
2697 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
2699 VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
2701 count = RTE_MIN(count, MAX_PKT_BURST);
2702 count = RTE_MIN(count, free_entries);
2703 VHOST_LOG_DATA(DEBUG, "(%d) about to dequeue %u buffers\n",
2706 if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
2709 for (i = 0; i < count; i++) {
2710 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2713 uint16_t nr_vec = 0;
2716 if (unlikely(fill_vec_buf_split(dev, vq,
2717 vq->last_avail_idx + i,
2719 &head_idx, &buf_len,
2720 VHOST_ACCESS_RO) < 0))
2723 update_shadow_used_ring_split(vq, head_idx, 0);
2725 err = virtio_dev_pktmbuf_prep(dev, pkts[i], buf_len);
2726 if (unlikely(err)) {
2728 * mbuf allocation fails for jumbo packets when external
2729 * buffer allocation is not allowed and linear buffer
2730 * is required. Drop this packet.
2732 if (!allocerr_warned) {
2734 "Failed mbuf alloc of size %d from %s on %s.\n",
2735 buf_len, mbuf_pool->name, dev->ifname);
2736 allocerr_warned = true;
2743 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts[i],
2744 mbuf_pool, legacy_ol_flags);
2745 if (unlikely(err)) {
2746 if (!allocerr_warned) {
2748 "Failed to copy desc to mbuf on %s.\n",
2750 allocerr_warned = true;
2759 rte_pktmbuf_free_bulk(&pkts[i - 1], count - i + 1);
2761 vq->last_avail_idx += i;
2763 do_data_copy_dequeue(vq);
2764 if (unlikely(i < count))
2765 vq->shadow_used_idx = i;
2766 if (likely(vq->shadow_used_idx)) {
2767 flush_shadow_used_ring_split(dev, vq);
2768 vhost_vring_call_split(dev, vq);
2771 return (i - dropped);
2776 virtio_dev_tx_split_legacy(struct virtio_net *dev,
2777 struct vhost_virtqueue *vq, struct rte_mempool *mbuf_pool,
2778 struct rte_mbuf **pkts, uint16_t count)
2780 return virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count, true);
2785 virtio_dev_tx_split_compliant(struct virtio_net *dev,
2786 struct vhost_virtqueue *vq, struct rte_mempool *mbuf_pool,
2787 struct rte_mbuf **pkts, uint16_t count)
2789 return virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count, false);
2792 static __rte_always_inline int
2793 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
2794 struct vhost_virtqueue *vq,
2795 struct rte_mbuf **pkts,
2797 uintptr_t *desc_addrs,
2800 bool wrap = vq->avail_wrap_counter;
2801 struct vring_packed_desc *descs = vq->desc_packed;
2802 uint64_t lens[PACKED_BATCH_SIZE];
2803 uint64_t buf_lens[PACKED_BATCH_SIZE];
2804 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2807 if (unlikely(avail_idx & PACKED_BATCH_MASK))
2809 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
2812 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2813 flags = descs[avail_idx + i].flags;
2814 if (unlikely((wrap != !!(flags & VRING_DESC_F_AVAIL)) ||
2815 (wrap == !!(flags & VRING_DESC_F_USED)) ||
2816 (flags & PACKED_DESC_SINGLE_DEQUEUE_FLAG)))
2820 rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
2822 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2823 lens[i] = descs[avail_idx + i].len;
2825 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2826 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
2827 descs[avail_idx + i].addr,
2828 &lens[i], VHOST_ACCESS_RW);
2831 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2832 if (unlikely(!desc_addrs[i]))
2834 if (unlikely((lens[i] != descs[avail_idx + i].len)))
2838 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2839 if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
2843 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2844 buf_lens[i] = pkts[i]->buf_len - pkts[i]->data_off;
2846 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2847 if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
2851 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2852 pkts[i]->pkt_len = lens[i] - buf_offset;
2853 pkts[i]->data_len = pkts[i]->pkt_len;
2854 ids[i] = descs[avail_idx + i].id;
2863 static __rte_always_inline int
2864 virtio_dev_tx_batch_packed(struct virtio_net *dev,
2865 struct vhost_virtqueue *vq,
2866 struct rte_mbuf **pkts,
2867 bool legacy_ol_flags)
2869 uint16_t avail_idx = vq->last_avail_idx;
2870 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2871 struct virtio_net_hdr *hdr;
2872 uintptr_t desc_addrs[PACKED_BATCH_SIZE];
2873 uint16_t ids[PACKED_BATCH_SIZE];
2876 if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
2880 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2881 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
2883 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2884 rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
2885 (void *)(uintptr_t)(desc_addrs[i] + buf_offset),
2888 if (virtio_net_with_host_offload(dev)) {
2889 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2890 hdr = (struct virtio_net_hdr *)(desc_addrs[i]);
2891 vhost_dequeue_offload(hdr, pkts[i], legacy_ol_flags);
2895 if (virtio_net_is_inorder(dev))
2896 vhost_shadow_dequeue_batch_packed_inorder(vq,
2897 ids[PACKED_BATCH_SIZE - 1]);
2899 vhost_shadow_dequeue_batch_packed(dev, vq, ids);
2901 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
2906 static __rte_always_inline int
2907 vhost_dequeue_single_packed(struct virtio_net *dev,
2908 struct vhost_virtqueue *vq,
2909 struct rte_mempool *mbuf_pool,
2910 struct rte_mbuf *pkts,
2912 uint16_t *desc_count,
2913 bool legacy_ol_flags)
2915 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2917 uint16_t nr_vec = 0;
2919 static bool allocerr_warned;
2921 if (unlikely(fill_vec_buf_packed(dev, vq,
2922 vq->last_avail_idx, desc_count,
2925 VHOST_ACCESS_RO) < 0))
2928 if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
2929 if (!allocerr_warned) {
2931 "Failed mbuf alloc of size %d from %s on %s.\n",
2932 buf_len, mbuf_pool->name, dev->ifname);
2933 allocerr_warned = true;
2938 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts,
2939 mbuf_pool, legacy_ol_flags);
2940 if (unlikely(err)) {
2941 if (!allocerr_warned) {
2943 "Failed to copy desc to mbuf on %s.\n",
2945 allocerr_warned = true;
2953 static __rte_always_inline int
2954 virtio_dev_tx_single_packed(struct virtio_net *dev,
2955 struct vhost_virtqueue *vq,
2956 struct rte_mempool *mbuf_pool,
2957 struct rte_mbuf *pkts,
2958 bool legacy_ol_flags)
2961 uint16_t buf_id, desc_count = 0;
2964 ret = vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id,
2965 &desc_count, legacy_ol_flags);
2967 if (likely(desc_count > 0)) {
2968 if (virtio_net_is_inorder(dev))
2969 vhost_shadow_dequeue_single_packed_inorder(vq, buf_id,
2972 vhost_shadow_dequeue_single_packed(vq, buf_id,
2975 vq_inc_last_avail_packed(vq, desc_count);
2983 virtio_dev_tx_packed(struct virtio_net *dev,
2984 struct vhost_virtqueue *__rte_restrict vq,
2985 struct rte_mempool *mbuf_pool,
2986 struct rte_mbuf **__rte_restrict pkts,
2988 bool legacy_ol_flags)
2990 uint32_t pkt_idx = 0;
2992 if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
2996 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
2998 if (count - pkt_idx >= PACKED_BATCH_SIZE) {
2999 if (!virtio_dev_tx_batch_packed(dev, vq,
3002 pkt_idx += PACKED_BATCH_SIZE;
3007 if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
3012 } while (pkt_idx < count);
3014 if (pkt_idx != count)
3015 rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
3017 if (vq->shadow_used_idx) {
3018 do_data_copy_dequeue(vq);
3020 vhost_flush_dequeue_shadow_packed(dev, vq);
3021 vhost_vring_call_packed(dev, vq);
3029 virtio_dev_tx_packed_legacy(struct virtio_net *dev,
3030 struct vhost_virtqueue *__rte_restrict vq, struct rte_mempool *mbuf_pool,
3031 struct rte_mbuf **__rte_restrict pkts, uint32_t count)
3033 return virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, count, true);
3038 virtio_dev_tx_packed_compliant(struct virtio_net *dev,
3039 struct vhost_virtqueue *__rte_restrict vq, struct rte_mempool *mbuf_pool,
3040 struct rte_mbuf **__rte_restrict pkts, uint32_t count)
3042 return virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, count, false);
3046 rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
3047 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
3049 struct virtio_net *dev;
3050 struct rte_mbuf *rarp_mbuf = NULL;
3051 struct vhost_virtqueue *vq;
3052 int16_t success = 1;
3054 dev = get_device(vid);
3058 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
3060 "(%d) %s: built-in vhost net backend is disabled.\n",
3061 dev->vid, __func__);
3065 if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
3067 "(%d) %s: invalid virtqueue idx %d.\n",
3068 dev->vid, __func__, queue_id);
3072 vq = dev->virtqueue[queue_id];
3074 if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0))
3077 if (unlikely(!vq->enabled)) {
3079 goto out_access_unlock;
3082 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
3083 vhost_user_iotlb_rd_lock(vq);
3085 if (unlikely(!vq->access_ok))
3086 if (unlikely(vring_translate(dev, vq) < 0)) {
3092 * Construct a RARP broadcast packet, and inject it to the "pkts"
3093 * array, to looks like that guest actually send such packet.
3095 * Check user_send_rarp() for more information.
3097 * broadcast_rarp shares a cacheline in the virtio_net structure
3098 * with some fields that are accessed during enqueue and
3099 * __atomic_compare_exchange_n causes a write if performed compare
3100 * and exchange. This could result in false sharing between enqueue
3103 * Prevent unnecessary false sharing by reading broadcast_rarp first
3104 * and only performing compare and exchange if the read indicates it
3105 * is likely to be set.
3107 if (unlikely(__atomic_load_n(&dev->broadcast_rarp, __ATOMIC_ACQUIRE) &&
3108 __atomic_compare_exchange_n(&dev->broadcast_rarp,
3109 &success, 0, 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED))) {
3111 rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac);
3112 if (rarp_mbuf == NULL) {
3113 VHOST_LOG_DATA(ERR, "Failed to make RARP packet.\n");
3118 * Inject it to the head of "pkts" array, so that switch's mac
3119 * learning table will get updated first.
3121 pkts[0] = rarp_mbuf;
3126 if (vq_is_packed(dev)) {
3127 if (dev->flags & VIRTIO_DEV_LEGACY_OL_FLAGS)
3128 count = virtio_dev_tx_packed_legacy(dev, vq, mbuf_pool, pkts, count);
3130 count = virtio_dev_tx_packed_compliant(dev, vq, mbuf_pool, pkts, count);
3132 if (dev->flags & VIRTIO_DEV_LEGACY_OL_FLAGS)
3133 count = virtio_dev_tx_split_legacy(dev, vq, mbuf_pool, pkts, count);
3135 count = virtio_dev_tx_split_compliant(dev, vq, mbuf_pool, pkts, count);
3139 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
3140 vhost_user_iotlb_rd_unlock(vq);
3143 rte_spinlock_unlock(&vq->access_lock);
3145 if (unlikely(rarp_mbuf != NULL))