1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
11 #include <rte_cycles.h>
12 #include <rte_memory.h>
13 #include <rte_branch_prediction.h>
14 #include <rte_mempool.h>
15 #include <rte_malloc.h>
17 #include <rte_ether.h>
18 #include <rte_ethdev_driver.h>
19 #include <rte_prefetch.h>
20 #include <rte_string_fns.h>
21 #include <rte_errno.h>
22 #include <rte_byteorder.h>
28 #include "virtio_logs.h"
29 #include "virtio_ethdev.h"
30 #include "virtio_pci.h"
31 #include "virtqueue.h"
32 #include "virtio_rxtx.h"
33 #include "virtio_rxtx_simple.h"
34 #include "virtio_ring.h"
36 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
37 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
39 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
43 virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
45 struct virtnet_rx *rxvq = rxq;
46 struct virtqueue *vq = rxvq->vq;
48 return VIRTQUEUE_NUSED(vq) >= offset;
52 vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
54 vq->vq_free_cnt += num;
55 vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
59 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
61 struct vring_desc *dp, *dp_tail;
62 struct vq_desc_extra *dxp;
63 uint16_t desc_idx_last = desc_idx;
65 dp = &vq->vq_split.ring.desc[desc_idx];
66 dxp = &vq->vq_descx[desc_idx];
67 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
68 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
69 while (dp->flags & VRING_DESC_F_NEXT) {
70 desc_idx_last = dp->next;
71 dp = &vq->vq_split.ring.desc[dp->next];
77 * We must append the existing free chain, if any, to the end of
78 * newly freed chain. If the virtqueue was completely used, then
79 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
81 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
82 vq->vq_desc_head_idx = desc_idx;
84 dp_tail = &vq->vq_split.ring.desc[vq->vq_desc_tail_idx];
85 dp_tail->next = desc_idx;
88 vq->vq_desc_tail_idx = desc_idx_last;
89 dp->next = VQ_RING_DESC_CHAIN_END;
93 vq_ring_free_id_packed(struct virtqueue *vq, uint16_t id)
95 struct vq_desc_extra *dxp;
97 dxp = &vq->vq_descx[id];
98 vq->vq_free_cnt += dxp->ndescs;
100 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END)
101 vq->vq_desc_head_idx = id;
103 vq->vq_descx[vq->vq_desc_tail_idx].next = id;
105 vq->vq_desc_tail_idx = id;
106 dxp->next = VQ_RING_DESC_CHAIN_END;
110 virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq,
111 struct rte_mbuf **rx_pkts,
115 struct rte_mbuf *cookie;
118 struct vring_packed_desc *desc;
121 desc = vq->vq_packed.ring.desc;
123 for (i = 0; i < num; i++) {
124 used_idx = vq->vq_used_cons_idx;
125 if (!desc_is_used(&desc[used_idx], vq))
127 virtio_rmb(vq->hw->weak_barriers);
128 len[i] = desc[used_idx].len;
129 id = desc[used_idx].id;
130 cookie = (struct rte_mbuf *)vq->vq_descx[id].cookie;
131 if (unlikely(cookie == NULL)) {
132 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
133 vq->vq_used_cons_idx);
136 rte_prefetch0(cookie);
137 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
141 vq->vq_used_cons_idx++;
142 if (vq->vq_used_cons_idx >= vq->vq_nentries) {
143 vq->vq_used_cons_idx -= vq->vq_nentries;
144 vq->vq_packed.used_wrap_counter ^= 1;
152 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
153 uint32_t *len, uint16_t num)
155 struct vring_used_elem *uep;
156 struct rte_mbuf *cookie;
157 uint16_t used_idx, desc_idx;
160 /* Caller does the check */
161 for (i = 0; i < num ; i++) {
162 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
163 uep = &vq->vq_split.ring.used->ring[used_idx];
164 desc_idx = (uint16_t) uep->id;
166 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
168 if (unlikely(cookie == NULL)) {
169 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
170 vq->vq_used_cons_idx);
174 rte_prefetch0(cookie);
175 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
177 vq->vq_used_cons_idx++;
178 vq_ring_free_chain(vq, desc_idx);
179 vq->vq_descx[desc_idx].cookie = NULL;
186 virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
187 struct rte_mbuf **rx_pkts,
191 struct vring_used_elem *uep;
192 struct rte_mbuf *cookie;
193 uint16_t used_idx = 0;
196 if (unlikely(num == 0))
199 for (i = 0; i < num; i++) {
200 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
201 /* Desc idx same as used idx */
202 uep = &vq->vq_split.ring.used->ring[used_idx];
204 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
206 if (unlikely(cookie == NULL)) {
207 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
208 vq->vq_used_cons_idx);
212 rte_prefetch0(cookie);
213 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
215 vq->vq_used_cons_idx++;
216 vq->vq_descx[used_idx].cookie = NULL;
219 vq_ring_free_inorder(vq, used_idx, i);
223 #ifndef DEFAULT_TX_FREE_THRESH
224 #define DEFAULT_TX_FREE_THRESH 32
228 virtio_xmit_cleanup_inorder_packed(struct virtqueue *vq, int num)
230 uint16_t used_idx, id, curr_id, free_cnt = 0;
231 uint16_t size = vq->vq_nentries;
232 struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
233 struct vq_desc_extra *dxp;
235 used_idx = vq->vq_used_cons_idx;
236 while (num > 0 && desc_is_used(&desc[used_idx], vq)) {
237 virtio_rmb(vq->hw->weak_barriers);
238 id = desc[used_idx].id;
241 dxp = &vq->vq_descx[used_idx];
242 used_idx += dxp->ndescs;
243 free_cnt += dxp->ndescs;
245 if (used_idx >= size) {
247 vq->vq_packed.used_wrap_counter ^= 1;
249 if (dxp->cookie != NULL) {
250 rte_pktmbuf_free(dxp->cookie);
253 } while (curr_id != id);
255 vq->vq_used_cons_idx = used_idx;
256 vq->vq_free_cnt += free_cnt;
260 virtio_xmit_cleanup_normal_packed(struct virtqueue *vq, int num)
262 uint16_t used_idx, id;
263 uint16_t size = vq->vq_nentries;
264 struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
265 struct vq_desc_extra *dxp;
267 used_idx = vq->vq_used_cons_idx;
268 while (num-- && desc_is_used(&desc[used_idx], vq)) {
269 virtio_rmb(vq->hw->weak_barriers);
270 id = desc[used_idx].id;
271 dxp = &vq->vq_descx[id];
272 vq->vq_used_cons_idx += dxp->ndescs;
273 if (vq->vq_used_cons_idx >= size) {
274 vq->vq_used_cons_idx -= size;
275 vq->vq_packed.used_wrap_counter ^= 1;
277 vq_ring_free_id_packed(vq, id);
278 if (dxp->cookie != NULL) {
279 rte_pktmbuf_free(dxp->cookie);
282 used_idx = vq->vq_used_cons_idx;
286 /* Cleanup from completed transmits. */
288 virtio_xmit_cleanup_packed(struct virtqueue *vq, int num, int in_order)
291 virtio_xmit_cleanup_inorder_packed(vq, num);
293 virtio_xmit_cleanup_normal_packed(vq, num);
297 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
299 uint16_t i, used_idx, desc_idx;
300 for (i = 0; i < num; i++) {
301 struct vring_used_elem *uep;
302 struct vq_desc_extra *dxp;
304 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
305 uep = &vq->vq_split.ring.used->ring[used_idx];
307 desc_idx = (uint16_t) uep->id;
308 dxp = &vq->vq_descx[desc_idx];
309 vq->vq_used_cons_idx++;
310 vq_ring_free_chain(vq, desc_idx);
312 if (dxp->cookie != NULL) {
313 rte_pktmbuf_free(dxp->cookie);
319 /* Cleanup from completed inorder transmits. */
321 virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num)
323 uint16_t i, idx = vq->vq_used_cons_idx;
324 int16_t free_cnt = 0;
325 struct vq_desc_extra *dxp = NULL;
327 if (unlikely(num == 0))
330 for (i = 0; i < num; i++) {
331 dxp = &vq->vq_descx[idx++ & (vq->vq_nentries - 1)];
332 free_cnt += dxp->ndescs;
333 if (dxp->cookie != NULL) {
334 rte_pktmbuf_free(dxp->cookie);
339 vq->vq_free_cnt += free_cnt;
340 vq->vq_used_cons_idx = idx;
344 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
345 struct rte_mbuf **cookies,
348 struct vq_desc_extra *dxp;
349 struct virtio_hw *hw = vq->hw;
350 struct vring_desc *start_dp;
351 uint16_t head_idx, idx, i = 0;
353 if (unlikely(vq->vq_free_cnt == 0))
355 if (unlikely(vq->vq_free_cnt < num))
358 head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
359 start_dp = vq->vq_split.ring.desc;
362 idx = head_idx & (vq->vq_nentries - 1);
363 dxp = &vq->vq_descx[idx];
364 dxp->cookie = (void *)cookies[i];
368 VIRTIO_MBUF_ADDR(cookies[i], vq) +
369 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
371 cookies[i]->buf_len -
372 RTE_PKTMBUF_HEADROOM +
374 start_dp[idx].flags = VRING_DESC_F_WRITE;
376 vq_update_avail_ring(vq, idx);
381 vq->vq_desc_head_idx += num;
382 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
387 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf **cookie,
390 struct vq_desc_extra *dxp;
391 struct virtio_hw *hw = vq->hw;
392 struct vring_desc *start_dp = vq->vq_split.ring.desc;
395 if (unlikely(vq->vq_free_cnt == 0))
397 if (unlikely(vq->vq_free_cnt < num))
400 if (unlikely(vq->vq_desc_head_idx >= vq->vq_nentries))
403 for (i = 0; i < num; i++) {
404 idx = vq->vq_desc_head_idx;
405 dxp = &vq->vq_descx[idx];
406 dxp->cookie = (void *)cookie[i];
410 VIRTIO_MBUF_ADDR(cookie[i], vq) +
411 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
413 cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM +
415 start_dp[idx].flags = VRING_DESC_F_WRITE;
416 vq->vq_desc_head_idx = start_dp[idx].next;
417 vq_update_avail_ring(vq, idx);
418 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) {
419 vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
424 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
430 virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq,
431 struct rte_mbuf **cookie, uint16_t num)
433 struct vring_packed_desc *start_dp = vq->vq_packed.ring.desc;
434 uint16_t flags = vq->vq_packed.cached_flags;
435 struct virtio_hw *hw = vq->hw;
436 struct vq_desc_extra *dxp;
440 if (unlikely(vq->vq_free_cnt == 0))
442 if (unlikely(vq->vq_free_cnt < num))
445 for (i = 0; i < num; i++) {
446 idx = vq->vq_avail_idx;
447 dxp = &vq->vq_descx[idx];
448 dxp->cookie = (void *)cookie[i];
451 start_dp[idx].addr = VIRTIO_MBUF_ADDR(cookie[i], vq) +
452 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
453 start_dp[idx].len = cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM
454 + hw->vtnet_hdr_size;
456 vq->vq_desc_head_idx = dxp->next;
457 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
458 vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
459 virtio_wmb(hw->weak_barriers);
460 start_dp[idx].flags = flags;
461 if (++vq->vq_avail_idx >= vq->vq_nentries) {
462 vq->vq_avail_idx -= vq->vq_nentries;
463 vq->vq_packed.cached_flags ^=
464 VRING_PACKED_DESC_F_AVAIL_USED;
465 flags = vq->vq_packed.cached_flags;
468 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
472 /* When doing TSO, the IP length is not included in the pseudo header
473 * checksum of the packet given to the PMD, but for virtio it is
477 virtio_tso_fix_cksum(struct rte_mbuf *m)
479 /* common case: header is not fragmented */
480 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
482 struct rte_ipv4_hdr *iph;
483 struct rte_ipv6_hdr *ip6h;
484 struct rte_tcp_hdr *th;
485 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
488 iph = rte_pktmbuf_mtod_offset(m,
489 struct rte_ipv4_hdr *, m->l2_len);
490 th = RTE_PTR_ADD(iph, m->l3_len);
491 if ((iph->version_ihl >> 4) == 4) {
492 iph->hdr_checksum = 0;
493 iph->hdr_checksum = rte_ipv4_cksum(iph);
494 ip_len = iph->total_length;
495 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
498 ip6h = (struct rte_ipv6_hdr *)iph;
499 ip_paylen = ip6h->payload_len;
502 /* calculate the new phdr checksum not including ip_paylen */
503 prev_cksum = th->cksum;
506 tmp = (tmp & 0xffff) + (tmp >> 16);
509 /* replace it in the packet */
510 th->cksum = new_cksum;
515 /* avoid write operation when necessary, to lessen cache issues */
516 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
517 if ((var) != (val)) \
521 #define virtqueue_clear_net_hdr(_hdr) do { \
522 ASSIGN_UNLESS_EQUAL((_hdr)->csum_start, 0); \
523 ASSIGN_UNLESS_EQUAL((_hdr)->csum_offset, 0); \
524 ASSIGN_UNLESS_EQUAL((_hdr)->flags, 0); \
525 ASSIGN_UNLESS_EQUAL((_hdr)->gso_type, 0); \
526 ASSIGN_UNLESS_EQUAL((_hdr)->gso_size, 0); \
527 ASSIGN_UNLESS_EQUAL((_hdr)->hdr_len, 0); \
531 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
532 struct rte_mbuf *cookie,
536 if (cookie->ol_flags & PKT_TX_TCP_SEG)
537 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
539 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
540 case PKT_TX_UDP_CKSUM:
541 hdr->csum_start = cookie->l2_len + cookie->l3_len;
542 hdr->csum_offset = offsetof(struct rte_udp_hdr,
544 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
547 case PKT_TX_TCP_CKSUM:
548 hdr->csum_start = cookie->l2_len + cookie->l3_len;
549 hdr->csum_offset = offsetof(struct rte_tcp_hdr, cksum);
550 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
554 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
555 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
556 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
560 /* TCP Segmentation Offload */
561 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
562 virtio_tso_fix_cksum(cookie);
563 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
564 VIRTIO_NET_HDR_GSO_TCPV6 :
565 VIRTIO_NET_HDR_GSO_TCPV4;
566 hdr->gso_size = cookie->tso_segsz;
572 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
573 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
574 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
580 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
581 struct rte_mbuf **cookies,
584 struct vq_desc_extra *dxp;
585 struct virtqueue *vq = txvq->vq;
586 struct vring_desc *start_dp;
587 struct virtio_net_hdr *hdr;
589 uint16_t head_size = vq->hw->vtnet_hdr_size;
592 idx = vq->vq_desc_head_idx;
593 start_dp = vq->vq_split.ring.desc;
596 idx = idx & (vq->vq_nentries - 1);
597 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
598 dxp->cookie = (void *)cookies[i];
601 hdr = (struct virtio_net_hdr *)
602 rte_pktmbuf_prepend(cookies[i], head_size);
603 cookies[i]->pkt_len -= head_size;
605 /* if offload disabled, hdr is not zeroed yet, do it now */
606 if (!vq->hw->has_tx_offload)
607 virtqueue_clear_net_hdr(hdr);
609 virtqueue_xmit_offload(hdr, cookies[i], true);
611 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
612 start_dp[idx].len = cookies[i]->data_len;
613 start_dp[idx].flags = 0;
615 vq_update_avail_ring(vq, idx);
621 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
622 vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
626 virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq,
627 struct rte_mbuf *cookie,
630 struct virtqueue *vq = txvq->vq;
631 struct vring_packed_desc *dp;
632 struct vq_desc_extra *dxp;
633 uint16_t idx, id, flags;
634 uint16_t head_size = vq->hw->vtnet_hdr_size;
635 struct virtio_net_hdr *hdr;
637 id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
638 idx = vq->vq_avail_idx;
639 dp = &vq->vq_packed.ring.desc[idx];
641 dxp = &vq->vq_descx[id];
643 dxp->cookie = cookie;
645 flags = vq->vq_packed.cached_flags;
647 /* prepend cannot fail, checked by caller */
648 hdr = (struct virtio_net_hdr *)
649 rte_pktmbuf_prepend(cookie, head_size);
650 cookie->pkt_len -= head_size;
652 /* if offload disabled, hdr is not zeroed yet, do it now */
653 if (!vq->hw->has_tx_offload)
654 virtqueue_clear_net_hdr(hdr);
656 virtqueue_xmit_offload(hdr, cookie, true);
658 dp->addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
659 dp->len = cookie->data_len;
662 if (++vq->vq_avail_idx >= vq->vq_nentries) {
663 vq->vq_avail_idx -= vq->vq_nentries;
664 vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED;
670 vq->vq_desc_head_idx = dxp->next;
671 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
672 vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
675 virtio_wmb(vq->hw->weak_barriers);
680 virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
681 uint16_t needed, int can_push, int in_order)
683 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
684 struct vq_desc_extra *dxp;
685 struct virtqueue *vq = txvq->vq;
686 struct vring_packed_desc *start_dp, *head_dp;
687 uint16_t idx, id, head_idx, head_flags;
688 uint16_t head_size = vq->hw->vtnet_hdr_size;
689 struct virtio_net_hdr *hdr;
692 id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
694 dxp = &vq->vq_descx[id];
695 dxp->ndescs = needed;
696 dxp->cookie = cookie;
698 head_idx = vq->vq_avail_idx;
701 start_dp = vq->vq_packed.ring.desc;
703 head_dp = &vq->vq_packed.ring.desc[idx];
704 head_flags = cookie->next ? VRING_DESC_F_NEXT : 0;
705 head_flags |= vq->vq_packed.cached_flags;
708 /* prepend cannot fail, checked by caller */
709 hdr = (struct virtio_net_hdr *)
710 rte_pktmbuf_prepend(cookie, head_size);
711 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
712 * which is wrong. Below subtract restores correct pkt size.
714 cookie->pkt_len -= head_size;
716 /* if offload disabled, it is not zeroed below, do it now */
717 if (!vq->hw->has_tx_offload)
718 virtqueue_clear_net_hdr(hdr);
720 /* setup first tx ring slot to point to header
721 * stored in reserved region.
723 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
724 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
725 start_dp[idx].len = vq->hw->vtnet_hdr_size;
726 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
728 if (idx >= vq->vq_nentries) {
729 idx -= vq->vq_nentries;
730 vq->vq_packed.cached_flags ^=
731 VRING_PACKED_DESC_F_AVAIL_USED;
735 virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
740 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
741 start_dp[idx].len = cookie->data_len;
742 if (likely(idx != head_idx)) {
743 flags = cookie->next ? VRING_DESC_F_NEXT : 0;
744 flags |= vq->vq_packed.cached_flags;
745 start_dp[idx].flags = flags;
749 if (idx >= vq->vq_nentries) {
750 idx -= vq->vq_nentries;
751 vq->vq_packed.cached_flags ^=
752 VRING_PACKED_DESC_F_AVAIL_USED;
754 } while ((cookie = cookie->next) != NULL);
756 start_dp[prev].id = id;
758 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
759 vq->vq_avail_idx = idx;
762 vq->vq_desc_head_idx = dxp->next;
763 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
764 vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
767 virtio_wmb(vq->hw->weak_barriers);
768 head_dp->flags = head_flags;
772 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
773 uint16_t needed, int use_indirect, int can_push,
776 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
777 struct vq_desc_extra *dxp;
778 struct virtqueue *vq = txvq->vq;
779 struct vring_desc *start_dp;
780 uint16_t seg_num = cookie->nb_segs;
781 uint16_t head_idx, idx;
782 uint16_t head_size = vq->hw->vtnet_hdr_size;
783 struct virtio_net_hdr *hdr;
785 head_idx = vq->vq_desc_head_idx;
788 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
790 dxp = &vq->vq_descx[idx];
791 dxp->cookie = (void *)cookie;
792 dxp->ndescs = needed;
794 start_dp = vq->vq_split.ring.desc;
797 /* prepend cannot fail, checked by caller */
798 hdr = (struct virtio_net_hdr *)
799 rte_pktmbuf_prepend(cookie, head_size);
800 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
801 * which is wrong. Below subtract restores correct pkt size.
803 cookie->pkt_len -= head_size;
805 /* if offload disabled, it is not zeroed below, do it now */
806 if (!vq->hw->has_tx_offload)
807 virtqueue_clear_net_hdr(hdr);
808 } else if (use_indirect) {
809 /* setup tx ring slot to point to indirect
810 * descriptor list stored in reserved region.
812 * the first slot in indirect ring is already preset
813 * to point to the header in reserved region
815 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
816 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
817 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
818 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
819 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
821 /* loop below will fill in rest of the indirect elements */
822 start_dp = txr[idx].tx_indir;
825 /* setup first tx ring slot to point to header
826 * stored in reserved region.
828 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
829 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
830 start_dp[idx].len = vq->hw->vtnet_hdr_size;
831 start_dp[idx].flags = VRING_DESC_F_NEXT;
832 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
834 idx = start_dp[idx].next;
837 virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
840 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
841 start_dp[idx].len = cookie->data_len;
842 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
843 idx = start_dp[idx].next;
844 } while ((cookie = cookie->next) != NULL);
847 idx = vq->vq_split.ring.desc[head_idx].next;
849 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
851 vq->vq_desc_head_idx = idx;
852 vq_update_avail_ring(vq, head_idx);
855 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
856 vq->vq_desc_tail_idx = idx;
861 virtio_dev_cq_start(struct rte_eth_dev *dev)
863 struct virtio_hw *hw = dev->data->dev_private;
865 if (hw->cvq && hw->cvq->vq) {
866 rte_spinlock_init(&hw->cvq->lock);
867 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
872 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
875 unsigned int socket_id __rte_unused,
876 const struct rte_eth_rxconf *rx_conf __rte_unused,
877 struct rte_mempool *mp)
879 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
880 struct virtio_hw *hw = dev->data->dev_private;
881 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
882 struct virtnet_rx *rxvq;
884 PMD_INIT_FUNC_TRACE();
886 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
887 nb_desc = vq->vq_nentries;
888 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
891 rxvq->queue_id = queue_idx;
893 dev->data->rx_queues[queue_idx] = rxvq;
899 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
901 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
902 struct virtio_hw *hw = dev->data->dev_private;
903 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
904 struct virtnet_rx *rxvq = &vq->rxq;
909 PMD_INIT_FUNC_TRACE();
911 /* Allocate blank mbufs for the each rx descriptor */
914 if (hw->use_simple_rx) {
915 for (desc_idx = 0; desc_idx < vq->vq_nentries;
917 vq->vq_split.ring.avail->ring[desc_idx] = desc_idx;
918 vq->vq_split.ring.desc[desc_idx].flags =
922 virtio_rxq_vec_setup(rxvq);
925 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
926 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
928 vq->sw_ring[vq->vq_nentries + desc_idx] =
932 if (hw->use_simple_rx) {
933 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
934 virtio_rxq_rearm_vec(rxvq);
935 nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
937 } else if (hw->use_inorder_rx) {
938 if ((!virtqueue_full(vq))) {
939 uint16_t free_cnt = vq->vq_free_cnt;
940 struct rte_mbuf *pkts[free_cnt];
942 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
944 error = virtqueue_enqueue_refill_inorder(vq,
947 if (unlikely(error)) {
948 for (i = 0; i < free_cnt; i++)
949 rte_pktmbuf_free(pkts[i]);
954 vq_update_avail_idx(vq);
957 while (!virtqueue_full(vq)) {
958 m = rte_mbuf_raw_alloc(rxvq->mpool);
962 /* Enqueue allocated buffers */
963 if (vtpci_packed_queue(vq->hw))
964 error = virtqueue_enqueue_recv_refill_packed(vq,
967 error = virtqueue_enqueue_recv_refill(vq,
976 if (!vtpci_packed_queue(vq->hw))
977 vq_update_avail_idx(vq);
980 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
988 * struct rte_eth_dev *dev: Used to update dev
989 * uint16_t nb_desc: Defaults to values read from config space
990 * unsigned int socket_id: Used to allocate memzone
991 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
992 * uint16_t queue_idx: Just used as an index in dev txq list
995 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
998 unsigned int socket_id __rte_unused,
999 const struct rte_eth_txconf *tx_conf)
1001 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1002 struct virtio_hw *hw = dev->data->dev_private;
1003 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1004 struct virtnet_tx *txvq;
1005 uint16_t tx_free_thresh;
1007 PMD_INIT_FUNC_TRACE();
1009 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
1010 nb_desc = vq->vq_nentries;
1011 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
1014 txvq->queue_id = queue_idx;
1016 tx_free_thresh = tx_conf->tx_free_thresh;
1017 if (tx_free_thresh == 0)
1019 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
1021 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
1022 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
1023 "number of TX entries minus 3 (%u)."
1024 " (tx_free_thresh=%u port=%u queue=%u)\n",
1025 vq->vq_nentries - 3,
1026 tx_free_thresh, dev->data->port_id, queue_idx);
1030 vq->vq_free_thresh = tx_free_thresh;
1032 dev->data->tx_queues[queue_idx] = txvq;
1037 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
1040 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1041 struct virtio_hw *hw = dev->data->dev_private;
1042 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1044 PMD_INIT_FUNC_TRACE();
1046 if (!vtpci_packed_queue(hw)) {
1047 if (hw->use_inorder_tx)
1048 vq->vq_split.ring.desc[vq->vq_nentries - 1].next = 0;
1057 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
1061 * Requeue the discarded mbuf. This should always be
1062 * successful since it was just dequeued.
1064 if (vtpci_packed_queue(vq->hw))
1065 error = virtqueue_enqueue_recv_refill_packed(vq, &m, 1);
1067 error = virtqueue_enqueue_recv_refill(vq, &m, 1);
1069 if (unlikely(error)) {
1070 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
1071 rte_pktmbuf_free(m);
1076 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
1080 error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
1081 if (unlikely(error)) {
1082 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
1083 rte_pktmbuf_free(m);
1088 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
1090 uint32_t s = mbuf->pkt_len;
1091 struct rte_ether_addr *ea;
1096 stats->size_bins[1]++;
1097 } else if (s > 64 && s < 1024) {
1100 /* count zeros, and offset into correct bin */
1101 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
1102 stats->size_bins[bin]++;
1105 stats->size_bins[0]++;
1107 stats->size_bins[6]++;
1109 stats->size_bins[7]++;
1112 ea = rte_pktmbuf_mtod(mbuf, struct rte_ether_addr *);
1113 if (rte_is_multicast_ether_addr(ea)) {
1114 if (rte_is_broadcast_ether_addr(ea))
1122 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
1124 VIRTIO_DUMP_PACKET(m, m->data_len);
1126 virtio_update_packet_stats(&rxvq->stats, m);
1129 /* Optionally fill offload information in structure */
1131 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
1133 struct rte_net_hdr_lens hdr_lens;
1134 uint32_t hdrlen, ptype;
1135 int l4_supported = 0;
1138 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1141 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
1143 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
1144 m->packet_type = ptype;
1145 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
1146 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
1147 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
1150 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1151 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
1152 if (hdr->csum_start <= hdrlen && l4_supported) {
1153 m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
1155 /* Unknown proto or tunnel, do sw cksum. We can assume
1156 * the cksum field is in the first segment since the
1157 * buffers we provided to the host are large enough.
1158 * In case of SCTP, this will be wrong since it's a CRC
1159 * but there's nothing we can do.
1161 uint16_t csum = 0, off;
1163 rte_raw_cksum_mbuf(m, hdr->csum_start,
1164 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
1166 if (likely(csum != 0xffff))
1168 off = hdr->csum_offset + hdr->csum_start;
1169 if (rte_pktmbuf_data_len(m) >= off + 1)
1170 *rte_pktmbuf_mtod_offset(m, uint16_t *,
1173 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
1174 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
1177 /* GSO request, save required information in mbuf */
1178 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1179 /* Check unsupported modes */
1180 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
1181 (hdr->gso_size == 0)) {
1185 /* Update mss lengthes in mbuf */
1186 m->tso_segsz = hdr->gso_size;
1187 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1188 case VIRTIO_NET_HDR_GSO_TCPV4:
1189 case VIRTIO_NET_HDR_GSO_TCPV6:
1190 m->ol_flags |= PKT_RX_LRO | \
1191 PKT_RX_L4_CKSUM_NONE;
1201 #define VIRTIO_MBUF_BURST_SZ 64
1202 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
1204 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
1206 struct virtnet_rx *rxvq = rx_queue;
1207 struct virtqueue *vq = rxvq->vq;
1208 struct virtio_hw *hw = vq->hw;
1209 struct rte_mbuf *rxm;
1210 uint16_t nb_used, num, nb_rx;
1211 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1212 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1214 uint32_t i, nb_enqueued;
1216 struct virtio_net_hdr *hdr;
1219 if (unlikely(hw->started == 0))
1222 nb_used = VIRTQUEUE_NUSED(vq);
1224 virtio_rmb(hw->weak_barriers);
1226 num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1227 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1228 num = VIRTIO_MBUF_BURST_SZ;
1229 if (likely(num > DESC_PER_CACHELINE))
1230 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1232 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1233 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
1236 hdr_size = hw->vtnet_hdr_size;
1238 for (i = 0; i < num ; i++) {
1241 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1243 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1244 PMD_RX_LOG(ERR, "Packet drop");
1246 virtio_discard_rxbuf(vq, rxm);
1247 rxvq->stats.errors++;
1251 rxm->port = rxvq->port_id;
1252 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1256 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1257 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1259 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1260 RTE_PKTMBUF_HEADROOM - hdr_size);
1263 rte_vlan_strip(rxm);
1265 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1266 virtio_discard_rxbuf(vq, rxm);
1267 rxvq->stats.errors++;
1271 virtio_rx_stats_updated(rxvq, rxm);
1273 rx_pkts[nb_rx++] = rxm;
1276 rxvq->stats.packets += nb_rx;
1278 /* Allocate new mbuf for the used descriptor */
1279 if (likely(!virtqueue_full(vq))) {
1280 uint16_t free_cnt = vq->vq_free_cnt;
1281 struct rte_mbuf *new_pkts[free_cnt];
1283 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1285 error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1287 if (unlikely(error)) {
1288 for (i = 0; i < free_cnt; i++)
1289 rte_pktmbuf_free(new_pkts[i]);
1291 nb_enqueued += free_cnt;
1293 struct rte_eth_dev *dev =
1294 &rte_eth_devices[rxvq->port_id];
1295 dev->data->rx_mbuf_alloc_failed += free_cnt;
1299 if (likely(nb_enqueued)) {
1300 vq_update_avail_idx(vq);
1302 if (unlikely(virtqueue_kick_prepare(vq))) {
1303 virtqueue_notify(vq);
1304 PMD_RX_LOG(DEBUG, "Notified");
1312 virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts,
1315 struct virtnet_rx *rxvq = rx_queue;
1316 struct virtqueue *vq = rxvq->vq;
1317 struct virtio_hw *hw = vq->hw;
1318 struct rte_mbuf *rxm;
1319 uint16_t num, nb_rx;
1320 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1321 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1323 uint32_t i, nb_enqueued;
1325 struct virtio_net_hdr *hdr;
1328 if (unlikely(hw->started == 0))
1331 num = RTE_MIN(VIRTIO_MBUF_BURST_SZ, nb_pkts);
1332 if (likely(num > DESC_PER_CACHELINE))
1333 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1335 num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1336 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1339 hdr_size = hw->vtnet_hdr_size;
1341 for (i = 0; i < num; i++) {
1344 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1346 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1347 PMD_RX_LOG(ERR, "Packet drop");
1349 virtio_discard_rxbuf(vq, rxm);
1350 rxvq->stats.errors++;
1354 rxm->port = rxvq->port_id;
1355 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1359 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1360 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1362 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1363 RTE_PKTMBUF_HEADROOM - hdr_size);
1366 rte_vlan_strip(rxm);
1368 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1369 virtio_discard_rxbuf(vq, rxm);
1370 rxvq->stats.errors++;
1374 virtio_rx_stats_updated(rxvq, rxm);
1376 rx_pkts[nb_rx++] = rxm;
1379 rxvq->stats.packets += nb_rx;
1381 /* Allocate new mbuf for the used descriptor */
1382 if (likely(!virtqueue_full(vq))) {
1383 uint16_t free_cnt = vq->vq_free_cnt;
1384 struct rte_mbuf *new_pkts[free_cnt];
1386 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1388 error = virtqueue_enqueue_recv_refill_packed(vq,
1389 new_pkts, free_cnt);
1390 if (unlikely(error)) {
1391 for (i = 0; i < free_cnt; i++)
1392 rte_pktmbuf_free(new_pkts[i]);
1394 nb_enqueued += free_cnt;
1396 struct rte_eth_dev *dev =
1397 &rte_eth_devices[rxvq->port_id];
1398 dev->data->rx_mbuf_alloc_failed += free_cnt;
1402 if (likely(nb_enqueued)) {
1403 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1404 virtqueue_notify(vq);
1405 PMD_RX_LOG(DEBUG, "Notified");
1414 virtio_recv_pkts_inorder(void *rx_queue,
1415 struct rte_mbuf **rx_pkts,
1418 struct virtnet_rx *rxvq = rx_queue;
1419 struct virtqueue *vq = rxvq->vq;
1420 struct virtio_hw *hw = vq->hw;
1421 struct rte_mbuf *rxm;
1422 struct rte_mbuf *prev = NULL;
1423 uint16_t nb_used, num, nb_rx;
1424 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1425 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1427 uint32_t nb_enqueued;
1434 if (unlikely(hw->started == 0))
1437 nb_used = VIRTQUEUE_NUSED(vq);
1438 nb_used = RTE_MIN(nb_used, nb_pkts);
1439 nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1441 virtio_rmb(hw->weak_barriers);
1443 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1448 hdr_size = hw->vtnet_hdr_size;
1450 num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1452 for (i = 0; i < num; i++) {
1453 struct virtio_net_hdr_mrg_rxbuf *header;
1455 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1456 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1460 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1461 PMD_RX_LOG(ERR, "Packet drop");
1463 virtio_discard_rxbuf_inorder(vq, rxm);
1464 rxvq->stats.errors++;
1468 header = (struct virtio_net_hdr_mrg_rxbuf *)
1469 ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1472 if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
1473 seg_num = header->num_buffers;
1480 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1481 rxm->nb_segs = seg_num;
1484 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1485 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1487 rxm->port = rxvq->port_id;
1489 rx_pkts[nb_rx] = rxm;
1492 if (vq->hw->has_rx_offload &&
1493 virtio_rx_offload(rxm, &header->hdr) < 0) {
1494 virtio_discard_rxbuf_inorder(vq, rxm);
1495 rxvq->stats.errors++;
1500 rte_vlan_strip(rx_pkts[nb_rx]);
1502 seg_res = seg_num - 1;
1504 /* Merge remaining segments */
1505 while (seg_res != 0 && i < (num - 1)) {
1509 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1510 rxm->pkt_len = (uint32_t)(len[i]);
1511 rxm->data_len = (uint16_t)(len[i]);
1513 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1523 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1528 /* Last packet still need merge segments */
1529 while (seg_res != 0) {
1530 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1531 VIRTIO_MBUF_BURST_SZ);
1533 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1534 virtio_rmb(hw->weak_barriers);
1535 num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1537 uint16_t extra_idx = 0;
1540 while (extra_idx < rcv_cnt) {
1541 rxm = rcv_pkts[extra_idx];
1543 RTE_PKTMBUF_HEADROOM - hdr_size;
1544 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1545 rxm->data_len = (uint16_t)(len[extra_idx]);
1548 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1554 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1559 "No enough segments for packet.");
1560 virtio_discard_rxbuf_inorder(vq, prev);
1561 rxvq->stats.errors++;
1566 rxvq->stats.packets += nb_rx;
1568 /* Allocate new mbuf for the used descriptor */
1570 if (likely(!virtqueue_full(vq))) {
1571 /* free_cnt may include mrg descs */
1572 uint16_t free_cnt = vq->vq_free_cnt;
1573 struct rte_mbuf *new_pkts[free_cnt];
1575 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1576 error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1578 if (unlikely(error)) {
1579 for (i = 0; i < free_cnt; i++)
1580 rte_pktmbuf_free(new_pkts[i]);
1582 nb_enqueued += free_cnt;
1584 struct rte_eth_dev *dev =
1585 &rte_eth_devices[rxvq->port_id];
1586 dev->data->rx_mbuf_alloc_failed += free_cnt;
1590 if (likely(nb_enqueued)) {
1591 vq_update_avail_idx(vq);
1593 if (unlikely(virtqueue_kick_prepare(vq))) {
1594 virtqueue_notify(vq);
1595 PMD_RX_LOG(DEBUG, "Notified");
1603 virtio_recv_mergeable_pkts(void *rx_queue,
1604 struct rte_mbuf **rx_pkts,
1607 struct virtnet_rx *rxvq = rx_queue;
1608 struct virtqueue *vq = rxvq->vq;
1609 struct virtio_hw *hw = vq->hw;
1610 struct rte_mbuf *rxm;
1611 struct rte_mbuf *prev = NULL;
1612 uint16_t nb_used, num, nb_rx = 0;
1613 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1614 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1616 uint32_t nb_enqueued = 0;
1617 uint32_t seg_num = 0;
1618 uint32_t seg_res = 0;
1619 uint32_t hdr_size = hw->vtnet_hdr_size;
1622 if (unlikely(hw->started == 0))
1625 nb_used = VIRTQUEUE_NUSED(vq);
1627 virtio_rmb(hw->weak_barriers);
1629 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1631 num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1632 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1633 num = VIRTIO_MBUF_BURST_SZ;
1634 if (likely(num > DESC_PER_CACHELINE))
1635 num = num - ((vq->vq_used_cons_idx + num) %
1636 DESC_PER_CACHELINE);
1639 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1641 for (i = 0; i < num; i++) {
1642 struct virtio_net_hdr_mrg_rxbuf *header;
1644 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1645 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1649 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1650 PMD_RX_LOG(ERR, "Packet drop");
1652 virtio_discard_rxbuf(vq, rxm);
1653 rxvq->stats.errors++;
1657 header = (struct virtio_net_hdr_mrg_rxbuf *)
1658 ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1660 seg_num = header->num_buffers;
1664 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1665 rxm->nb_segs = seg_num;
1668 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1669 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1671 rxm->port = rxvq->port_id;
1673 rx_pkts[nb_rx] = rxm;
1676 if (hw->has_rx_offload &&
1677 virtio_rx_offload(rxm, &header->hdr) < 0) {
1678 virtio_discard_rxbuf(vq, rxm);
1679 rxvq->stats.errors++;
1684 rte_vlan_strip(rx_pkts[nb_rx]);
1686 seg_res = seg_num - 1;
1688 /* Merge remaining segments */
1689 while (seg_res != 0 && i < (num - 1)) {
1693 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1694 rxm->pkt_len = (uint32_t)(len[i]);
1695 rxm->data_len = (uint16_t)(len[i]);
1697 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1707 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1712 /* Last packet still need merge segments */
1713 while (seg_res != 0) {
1714 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1715 VIRTIO_MBUF_BURST_SZ);
1717 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1718 virtio_rmb(hw->weak_barriers);
1719 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,
1721 uint16_t extra_idx = 0;
1724 while (extra_idx < rcv_cnt) {
1725 rxm = rcv_pkts[extra_idx];
1727 RTE_PKTMBUF_HEADROOM - hdr_size;
1728 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1729 rxm->data_len = (uint16_t)(len[extra_idx]);
1732 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1738 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1743 "No enough segments for packet.");
1744 virtio_discard_rxbuf(vq, prev);
1745 rxvq->stats.errors++;
1750 rxvq->stats.packets += nb_rx;
1752 /* Allocate new mbuf for the used descriptor */
1753 if (likely(!virtqueue_full(vq))) {
1754 /* free_cnt may include mrg descs */
1755 uint16_t free_cnt = vq->vq_free_cnt;
1756 struct rte_mbuf *new_pkts[free_cnt];
1758 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1759 error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1761 if (unlikely(error)) {
1762 for (i = 0; i < free_cnt; i++)
1763 rte_pktmbuf_free(new_pkts[i]);
1765 nb_enqueued += free_cnt;
1767 struct rte_eth_dev *dev =
1768 &rte_eth_devices[rxvq->port_id];
1769 dev->data->rx_mbuf_alloc_failed += free_cnt;
1773 if (likely(nb_enqueued)) {
1774 vq_update_avail_idx(vq);
1776 if (unlikely(virtqueue_kick_prepare(vq))) {
1777 virtqueue_notify(vq);
1778 PMD_RX_LOG(DEBUG, "Notified");
1786 virtio_recv_mergeable_pkts_packed(void *rx_queue,
1787 struct rte_mbuf **rx_pkts,
1790 struct virtnet_rx *rxvq = rx_queue;
1791 struct virtqueue *vq = rxvq->vq;
1792 struct virtio_hw *hw = vq->hw;
1793 struct rte_mbuf *rxm;
1794 struct rte_mbuf *prev = NULL;
1795 uint16_t num, nb_rx = 0;
1796 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1797 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1798 uint32_t nb_enqueued = 0;
1799 uint32_t seg_num = 0;
1800 uint32_t seg_res = 0;
1801 uint32_t hdr_size = hw->vtnet_hdr_size;
1805 if (unlikely(hw->started == 0))
1810 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1811 num = VIRTIO_MBUF_BURST_SZ;
1812 if (likely(num > DESC_PER_CACHELINE))
1813 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1815 num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1817 for (i = 0; i < num; i++) {
1818 struct virtio_net_hdr_mrg_rxbuf *header;
1820 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1821 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1825 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1826 PMD_RX_LOG(ERR, "Packet drop");
1828 virtio_discard_rxbuf(vq, rxm);
1829 rxvq->stats.errors++;
1833 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)
1834 rxm->buf_addr + RTE_PKTMBUF_HEADROOM - hdr_size);
1835 seg_num = header->num_buffers;
1840 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1841 rxm->nb_segs = seg_num;
1844 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1845 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1847 rxm->port = rxvq->port_id;
1848 rx_pkts[nb_rx] = rxm;
1851 if (hw->has_rx_offload &&
1852 virtio_rx_offload(rxm, &header->hdr) < 0) {
1853 virtio_discard_rxbuf(vq, rxm);
1854 rxvq->stats.errors++;
1859 rte_vlan_strip(rx_pkts[nb_rx]);
1861 seg_res = seg_num - 1;
1863 /* Merge remaining segments */
1864 while (seg_res != 0 && i < (num - 1)) {
1868 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1869 rxm->pkt_len = (uint32_t)(len[i]);
1870 rxm->data_len = (uint16_t)(len[i]);
1872 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1882 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1887 /* Last packet still need merge segments */
1888 while (seg_res != 0) {
1889 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1890 VIRTIO_MBUF_BURST_SZ);
1891 if (likely(vq->vq_free_cnt >= rcv_cnt)) {
1892 num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
1894 uint16_t extra_idx = 0;
1898 while (extra_idx < rcv_cnt) {
1899 rxm = rcv_pkts[extra_idx];
1902 RTE_PKTMBUF_HEADROOM - hdr_size;
1903 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1904 rxm->data_len = (uint16_t)(len[extra_idx]);
1908 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1913 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1918 "No enough segments for packet.");
1920 virtio_discard_rxbuf(vq, prev);
1921 rxvq->stats.errors++;
1926 rxvq->stats.packets += nb_rx;
1928 /* Allocate new mbuf for the used descriptor */
1929 if (likely(!virtqueue_full(vq))) {
1930 /* free_cnt may include mrg descs */
1931 uint16_t free_cnt = vq->vq_free_cnt;
1932 struct rte_mbuf *new_pkts[free_cnt];
1934 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1935 error = virtqueue_enqueue_recv_refill_packed(vq,
1936 new_pkts, free_cnt);
1937 if (unlikely(error)) {
1938 for (i = 0; i < free_cnt; i++)
1939 rte_pktmbuf_free(new_pkts[i]);
1941 nb_enqueued += free_cnt;
1943 struct rte_eth_dev *dev =
1944 &rte_eth_devices[rxvq->port_id];
1945 dev->data->rx_mbuf_alloc_failed += free_cnt;
1949 if (likely(nb_enqueued)) {
1950 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1951 virtqueue_notify(vq);
1952 PMD_RX_LOG(DEBUG, "Notified");
1960 virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
1963 struct virtnet_tx *txvq = tx_queue;
1964 struct virtqueue *vq = txvq->vq;
1965 struct virtio_hw *hw = vq->hw;
1966 uint16_t hdr_size = hw->vtnet_hdr_size;
1968 bool in_order = hw->use_inorder_tx;
1971 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1974 if (unlikely(nb_pkts < 1))
1977 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1979 if (nb_pkts > vq->vq_free_cnt)
1980 virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt,
1983 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1984 struct rte_mbuf *txm = tx_pkts[nb_tx];
1985 int can_push = 0, slots, need;
1987 /* Do VLAN tag insertion */
1988 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1989 error = rte_vlan_insert(&txm);
1990 if (unlikely(error)) {
1991 rte_pktmbuf_free(txm);
1994 /* vlan_insert may add a header mbuf */
1995 tx_pkts[nb_tx] = txm;
1998 /* optimize ring usage */
1999 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2000 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2001 rte_mbuf_refcnt_read(txm) == 1 &&
2002 RTE_MBUF_DIRECT(txm) &&
2003 txm->nb_segs == 1 &&
2004 rte_pktmbuf_headroom(txm) >= hdr_size &&
2005 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2006 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2009 /* How many main ring entries are needed to this Tx?
2010 * any_layout => number of segments
2011 * default => number of segments + 1
2013 slots = txm->nb_segs + !can_push;
2014 need = slots - vq->vq_free_cnt;
2016 /* Positive value indicates it need free vring descriptors */
2017 if (unlikely(need > 0)) {
2018 virtio_xmit_cleanup_packed(vq, need, in_order);
2019 need = slots - vq->vq_free_cnt;
2020 if (unlikely(need > 0)) {
2022 "No free tx descriptors to transmit");
2027 /* Enqueue Packet buffers */
2029 virtqueue_enqueue_xmit_packed_fast(txvq, txm, in_order);
2031 virtqueue_enqueue_xmit_packed(txvq, txm, slots, 0,
2034 virtio_update_packet_stats(&txvq->stats, txm);
2037 txvq->stats.packets += nb_tx;
2039 if (likely(nb_tx)) {
2040 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
2041 virtqueue_notify(vq);
2042 PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2050 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
2052 struct virtnet_tx *txvq = tx_queue;
2053 struct virtqueue *vq = txvq->vq;
2054 struct virtio_hw *hw = vq->hw;
2055 uint16_t hdr_size = hw->vtnet_hdr_size;
2056 uint16_t nb_used, nb_tx = 0;
2059 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2062 if (unlikely(nb_pkts < 1))
2065 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2066 nb_used = VIRTQUEUE_NUSED(vq);
2068 virtio_rmb(hw->weak_barriers);
2069 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2070 virtio_xmit_cleanup(vq, nb_used);
2072 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2073 struct rte_mbuf *txm = tx_pkts[nb_tx];
2074 int can_push = 0, use_indirect = 0, slots, need;
2076 /* Do VLAN tag insertion */
2077 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
2078 error = rte_vlan_insert(&txm);
2079 if (unlikely(error)) {
2080 rte_pktmbuf_free(txm);
2083 /* vlan_insert may add a header mbuf */
2084 tx_pkts[nb_tx] = txm;
2087 /* optimize ring usage */
2088 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2089 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2090 rte_mbuf_refcnt_read(txm) == 1 &&
2091 RTE_MBUF_DIRECT(txm) &&
2092 txm->nb_segs == 1 &&
2093 rte_pktmbuf_headroom(txm) >= hdr_size &&
2094 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2095 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2097 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
2098 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
2101 /* How many main ring entries are needed to this Tx?
2102 * any_layout => number of segments
2104 * default => number of segments + 1
2106 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
2107 need = slots - vq->vq_free_cnt;
2109 /* Positive value indicates it need free vring descriptors */
2110 if (unlikely(need > 0)) {
2111 nb_used = VIRTQUEUE_NUSED(vq);
2112 virtio_rmb(hw->weak_barriers);
2113 need = RTE_MIN(need, (int)nb_used);
2115 virtio_xmit_cleanup(vq, need);
2116 need = slots - vq->vq_free_cnt;
2117 if (unlikely(need > 0)) {
2119 "No free tx descriptors to transmit");
2124 /* Enqueue Packet buffers */
2125 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
2128 virtio_update_packet_stats(&txvq->stats, txm);
2131 txvq->stats.packets += nb_tx;
2133 if (likely(nb_tx)) {
2134 vq_update_avail_idx(vq);
2136 if (unlikely(virtqueue_kick_prepare(vq))) {
2137 virtqueue_notify(vq);
2138 PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2146 virtio_xmit_pkts_inorder(void *tx_queue,
2147 struct rte_mbuf **tx_pkts,
2150 struct virtnet_tx *txvq = tx_queue;
2151 struct virtqueue *vq = txvq->vq;
2152 struct virtio_hw *hw = vq->hw;
2153 uint16_t hdr_size = hw->vtnet_hdr_size;
2154 uint16_t nb_used, nb_avail, nb_tx = 0, nb_inorder_pkts = 0;
2155 struct rte_mbuf *inorder_pkts[nb_pkts];
2158 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2161 if (unlikely(nb_pkts < 1))
2165 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2166 nb_used = VIRTQUEUE_NUSED(vq);
2168 virtio_rmb(hw->weak_barriers);
2169 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2170 virtio_xmit_cleanup_inorder(vq, nb_used);
2172 if (unlikely(!vq->vq_free_cnt))
2173 virtio_xmit_cleanup_inorder(vq, nb_used);
2175 nb_avail = RTE_MIN(vq->vq_free_cnt, nb_pkts);
2177 for (nb_tx = 0; nb_tx < nb_avail; nb_tx++) {
2178 struct rte_mbuf *txm = tx_pkts[nb_tx];
2181 /* Do VLAN tag insertion */
2182 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
2183 error = rte_vlan_insert(&txm);
2184 if (unlikely(error)) {
2185 rte_pktmbuf_free(txm);
2188 /* vlan_insert may add a header mbuf */
2189 tx_pkts[nb_tx] = txm;
2192 /* optimize ring usage */
2193 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2194 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2195 rte_mbuf_refcnt_read(txm) == 1 &&
2196 RTE_MBUF_DIRECT(txm) &&
2197 txm->nb_segs == 1 &&
2198 rte_pktmbuf_headroom(txm) >= hdr_size &&
2199 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2200 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
2201 inorder_pkts[nb_inorder_pkts] = txm;
2204 virtio_update_packet_stats(&txvq->stats, txm);
2208 if (nb_inorder_pkts) {
2209 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2211 nb_inorder_pkts = 0;
2214 slots = txm->nb_segs + 1;
2215 need = slots - vq->vq_free_cnt;
2216 if (unlikely(need > 0)) {
2217 nb_used = VIRTQUEUE_NUSED(vq);
2218 virtio_rmb(hw->weak_barriers);
2219 need = RTE_MIN(need, (int)nb_used);
2221 virtio_xmit_cleanup_inorder(vq, need);
2223 need = slots - vq->vq_free_cnt;
2225 if (unlikely(need > 0)) {
2227 "No free tx descriptors to transmit");
2231 /* Enqueue Packet buffers */
2232 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
2234 virtio_update_packet_stats(&txvq->stats, txm);
2237 /* Transmit all inorder packets */
2238 if (nb_inorder_pkts)
2239 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2242 txvq->stats.packets += nb_tx;
2244 if (likely(nb_tx)) {
2245 vq_update_avail_idx(vq);
2247 if (unlikely(virtqueue_kick_prepare(vq))) {
2248 virtqueue_notify(vq);
2249 PMD_TX_LOG(DEBUG, "Notified backend after xmit");