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 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
112 uint32_t s = mbuf->pkt_len;
113 struct rte_ether_addr *ea;
118 stats->size_bins[1]++;
119 } else if (s > 64 && s < 1024) {
122 /* count zeros, and offset into correct bin */
123 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
124 stats->size_bins[bin]++;
127 stats->size_bins[0]++;
129 stats->size_bins[6]++;
131 stats->size_bins[7]++;
134 ea = rte_pktmbuf_mtod(mbuf, struct rte_ether_addr *);
135 if (rte_is_multicast_ether_addr(ea)) {
136 if (rte_is_broadcast_ether_addr(ea))
144 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
146 VIRTIO_DUMP_PACKET(m, m->data_len);
148 virtio_update_packet_stats(&rxvq->stats, m);
152 virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq,
153 struct rte_mbuf **rx_pkts,
157 struct rte_mbuf *cookie;
160 struct vring_packed_desc *desc;
163 desc = vq->vq_packed.ring.desc;
165 for (i = 0; i < num; i++) {
166 used_idx = vq->vq_used_cons_idx;
167 if (!desc_is_used(&desc[used_idx], vq))
169 virtio_rmb(vq->hw->weak_barriers);
170 len[i] = desc[used_idx].len;
171 id = desc[used_idx].id;
172 cookie = (struct rte_mbuf *)vq->vq_descx[id].cookie;
173 if (unlikely(cookie == NULL)) {
174 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
175 vq->vq_used_cons_idx);
178 rte_prefetch0(cookie);
179 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
183 vq->vq_used_cons_idx++;
184 if (vq->vq_used_cons_idx >= vq->vq_nentries) {
185 vq->vq_used_cons_idx -= vq->vq_nentries;
186 vq->vq_packed.used_wrap_counter ^= 1;
194 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
195 uint32_t *len, uint16_t num)
197 struct vring_used_elem *uep;
198 struct rte_mbuf *cookie;
199 uint16_t used_idx, desc_idx;
202 /* Caller does the check */
203 for (i = 0; i < num ; i++) {
204 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
205 uep = &vq->vq_split.ring.used->ring[used_idx];
206 desc_idx = (uint16_t) uep->id;
208 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
210 if (unlikely(cookie == NULL)) {
211 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
212 vq->vq_used_cons_idx);
216 rte_prefetch0(cookie);
217 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
219 vq->vq_used_cons_idx++;
220 vq_ring_free_chain(vq, desc_idx);
221 vq->vq_descx[desc_idx].cookie = NULL;
228 virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
229 struct rte_mbuf **rx_pkts,
233 struct vring_used_elem *uep;
234 struct rte_mbuf *cookie;
235 uint16_t used_idx = 0;
238 if (unlikely(num == 0))
241 for (i = 0; i < num; i++) {
242 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
243 /* Desc idx same as used idx */
244 uep = &vq->vq_split.ring.used->ring[used_idx];
246 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
248 if (unlikely(cookie == NULL)) {
249 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
250 vq->vq_used_cons_idx);
254 rte_prefetch0(cookie);
255 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
257 vq->vq_used_cons_idx++;
258 vq->vq_descx[used_idx].cookie = NULL;
261 vq_ring_free_inorder(vq, used_idx, i);
265 #ifndef DEFAULT_TX_FREE_THRESH
266 #define DEFAULT_TX_FREE_THRESH 32
270 virtio_xmit_cleanup_inorder_packed(struct virtqueue *vq, int num)
272 uint16_t used_idx, id, curr_id, free_cnt = 0;
273 uint16_t size = vq->vq_nentries;
274 struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
275 struct vq_desc_extra *dxp;
277 used_idx = vq->vq_used_cons_idx;
278 while (num > 0 && desc_is_used(&desc[used_idx], vq)) {
279 virtio_rmb(vq->hw->weak_barriers);
280 id = desc[used_idx].id;
283 dxp = &vq->vq_descx[used_idx];
284 used_idx += dxp->ndescs;
285 free_cnt += dxp->ndescs;
287 if (used_idx >= size) {
289 vq->vq_packed.used_wrap_counter ^= 1;
291 if (dxp->cookie != NULL) {
292 rte_pktmbuf_free(dxp->cookie);
295 } while (curr_id != id);
297 vq->vq_used_cons_idx = used_idx;
298 vq->vq_free_cnt += free_cnt;
302 virtio_xmit_cleanup_normal_packed(struct virtqueue *vq, int num)
304 uint16_t used_idx, id;
305 uint16_t size = vq->vq_nentries;
306 struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
307 struct vq_desc_extra *dxp;
309 used_idx = vq->vq_used_cons_idx;
310 while (num-- && desc_is_used(&desc[used_idx], vq)) {
311 virtio_rmb(vq->hw->weak_barriers);
312 id = desc[used_idx].id;
313 dxp = &vq->vq_descx[id];
314 vq->vq_used_cons_idx += dxp->ndescs;
315 if (vq->vq_used_cons_idx >= size) {
316 vq->vq_used_cons_idx -= size;
317 vq->vq_packed.used_wrap_counter ^= 1;
319 vq_ring_free_id_packed(vq, id);
320 if (dxp->cookie != NULL) {
321 rte_pktmbuf_free(dxp->cookie);
324 used_idx = vq->vq_used_cons_idx;
328 /* Cleanup from completed transmits. */
330 virtio_xmit_cleanup_packed(struct virtqueue *vq, int num, int in_order)
333 virtio_xmit_cleanup_inorder_packed(vq, num);
335 virtio_xmit_cleanup_normal_packed(vq, num);
339 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
341 uint16_t i, used_idx, desc_idx;
342 for (i = 0; i < num; i++) {
343 struct vring_used_elem *uep;
344 struct vq_desc_extra *dxp;
346 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
347 uep = &vq->vq_split.ring.used->ring[used_idx];
349 desc_idx = (uint16_t) uep->id;
350 dxp = &vq->vq_descx[desc_idx];
351 vq->vq_used_cons_idx++;
352 vq_ring_free_chain(vq, desc_idx);
354 if (dxp->cookie != NULL) {
355 rte_pktmbuf_free(dxp->cookie);
361 /* Cleanup from completed inorder transmits. */
362 static __rte_always_inline void
363 virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num)
365 uint16_t i, idx = vq->vq_used_cons_idx;
366 int16_t free_cnt = 0;
367 struct vq_desc_extra *dxp = NULL;
369 if (unlikely(num == 0))
372 for (i = 0; i < num; i++) {
373 dxp = &vq->vq_descx[idx++ & (vq->vq_nentries - 1)];
374 free_cnt += dxp->ndescs;
375 if (dxp->cookie != NULL) {
376 rte_pktmbuf_free(dxp->cookie);
381 vq->vq_free_cnt += free_cnt;
382 vq->vq_used_cons_idx = idx;
386 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
387 struct rte_mbuf **cookies,
390 struct vq_desc_extra *dxp;
391 struct virtio_hw *hw = vq->hw;
392 struct vring_desc *start_dp;
393 uint16_t head_idx, idx, i = 0;
395 if (unlikely(vq->vq_free_cnt == 0))
397 if (unlikely(vq->vq_free_cnt < num))
400 head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
401 start_dp = vq->vq_split.ring.desc;
404 idx = head_idx & (vq->vq_nentries - 1);
405 dxp = &vq->vq_descx[idx];
406 dxp->cookie = (void *)cookies[i];
410 VIRTIO_MBUF_ADDR(cookies[i], vq) +
411 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
413 cookies[i]->buf_len -
414 RTE_PKTMBUF_HEADROOM +
416 start_dp[idx].flags = VRING_DESC_F_WRITE;
418 vq_update_avail_ring(vq, idx);
423 vq->vq_desc_head_idx += num;
424 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
429 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf **cookie,
432 struct vq_desc_extra *dxp;
433 struct virtio_hw *hw = vq->hw;
434 struct vring_desc *start_dp = vq->vq_split.ring.desc;
437 if (unlikely(vq->vq_free_cnt == 0))
439 if (unlikely(vq->vq_free_cnt < num))
442 if (unlikely(vq->vq_desc_head_idx >= vq->vq_nentries))
445 for (i = 0; i < num; i++) {
446 idx = vq->vq_desc_head_idx;
447 dxp = &vq->vq_descx[idx];
448 dxp->cookie = (void *)cookie[i];
452 VIRTIO_MBUF_ADDR(cookie[i], vq) +
453 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
455 cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM +
457 start_dp[idx].flags = VRING_DESC_F_WRITE;
458 vq->vq_desc_head_idx = start_dp[idx].next;
459 vq_update_avail_ring(vq, idx);
460 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) {
461 vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
466 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
472 virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq,
473 struct rte_mbuf **cookie, uint16_t num)
475 struct vring_packed_desc *start_dp = vq->vq_packed.ring.desc;
476 uint16_t flags = vq->vq_packed.cached_flags;
477 struct virtio_hw *hw = vq->hw;
478 struct vq_desc_extra *dxp;
482 if (unlikely(vq->vq_free_cnt == 0))
484 if (unlikely(vq->vq_free_cnt < num))
487 for (i = 0; i < num; i++) {
488 idx = vq->vq_avail_idx;
489 dxp = &vq->vq_descx[idx];
490 dxp->cookie = (void *)cookie[i];
493 start_dp[idx].addr = VIRTIO_MBUF_ADDR(cookie[i], vq) +
494 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
495 start_dp[idx].len = cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM
496 + hw->vtnet_hdr_size;
498 vq->vq_desc_head_idx = dxp->next;
499 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
500 vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
501 virtio_wmb(hw->weak_barriers);
502 start_dp[idx].flags = flags;
503 if (++vq->vq_avail_idx >= vq->vq_nentries) {
504 vq->vq_avail_idx -= vq->vq_nentries;
505 vq->vq_packed.cached_flags ^=
506 VRING_PACKED_DESC_F_AVAIL_USED;
507 flags = vq->vq_packed.cached_flags;
510 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
514 /* When doing TSO, the IP length is not included in the pseudo header
515 * checksum of the packet given to the PMD, but for virtio it is
519 virtio_tso_fix_cksum(struct rte_mbuf *m)
521 /* common case: header is not fragmented */
522 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
524 struct rte_ipv4_hdr *iph;
525 struct rte_ipv6_hdr *ip6h;
526 struct rte_tcp_hdr *th;
527 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
530 iph = rte_pktmbuf_mtod_offset(m,
531 struct rte_ipv4_hdr *, m->l2_len);
532 th = RTE_PTR_ADD(iph, m->l3_len);
533 if ((iph->version_ihl >> 4) == 4) {
534 iph->hdr_checksum = 0;
535 iph->hdr_checksum = rte_ipv4_cksum(iph);
536 ip_len = iph->total_length;
537 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
540 ip6h = (struct rte_ipv6_hdr *)iph;
541 ip_paylen = ip6h->payload_len;
544 /* calculate the new phdr checksum not including ip_paylen */
545 prev_cksum = th->cksum;
548 tmp = (tmp & 0xffff) + (tmp >> 16);
551 /* replace it in the packet */
552 th->cksum = new_cksum;
557 /* avoid write operation when necessary, to lessen cache issues */
558 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
559 if ((var) != (val)) \
563 #define virtqueue_clear_net_hdr(_hdr) do { \
564 ASSIGN_UNLESS_EQUAL((_hdr)->csum_start, 0); \
565 ASSIGN_UNLESS_EQUAL((_hdr)->csum_offset, 0); \
566 ASSIGN_UNLESS_EQUAL((_hdr)->flags, 0); \
567 ASSIGN_UNLESS_EQUAL((_hdr)->gso_type, 0); \
568 ASSIGN_UNLESS_EQUAL((_hdr)->gso_size, 0); \
569 ASSIGN_UNLESS_EQUAL((_hdr)->hdr_len, 0); \
573 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
574 struct rte_mbuf *cookie,
578 if (cookie->ol_flags & PKT_TX_TCP_SEG)
579 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
581 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
582 case PKT_TX_UDP_CKSUM:
583 hdr->csum_start = cookie->l2_len + cookie->l3_len;
584 hdr->csum_offset = offsetof(struct rte_udp_hdr,
586 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
589 case PKT_TX_TCP_CKSUM:
590 hdr->csum_start = cookie->l2_len + cookie->l3_len;
591 hdr->csum_offset = offsetof(struct rte_tcp_hdr, cksum);
592 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
596 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
597 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
598 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
602 /* TCP Segmentation Offload */
603 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
604 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
605 VIRTIO_NET_HDR_GSO_TCPV6 :
606 VIRTIO_NET_HDR_GSO_TCPV4;
607 hdr->gso_size = cookie->tso_segsz;
613 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
614 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
615 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
621 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
622 struct rte_mbuf **cookies,
625 struct vq_desc_extra *dxp;
626 struct virtqueue *vq = txvq->vq;
627 struct vring_desc *start_dp;
628 struct virtio_net_hdr *hdr;
630 uint16_t head_size = vq->hw->vtnet_hdr_size;
633 idx = vq->vq_desc_head_idx;
634 start_dp = vq->vq_split.ring.desc;
637 idx = idx & (vq->vq_nentries - 1);
638 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
639 dxp->cookie = (void *)cookies[i];
641 virtio_update_packet_stats(&txvq->stats, cookies[i]);
643 hdr = (struct virtio_net_hdr *)
644 rte_pktmbuf_prepend(cookies[i], head_size);
645 cookies[i]->pkt_len -= head_size;
647 /* if offload disabled, hdr is not zeroed yet, do it now */
648 if (!vq->hw->has_tx_offload)
649 virtqueue_clear_net_hdr(hdr);
651 virtqueue_xmit_offload(hdr, cookies[i], true);
653 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
654 start_dp[idx].len = cookies[i]->data_len;
655 start_dp[idx].flags = 0;
657 vq_update_avail_ring(vq, idx);
663 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
664 vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
668 virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq,
669 struct rte_mbuf *cookie,
672 struct virtqueue *vq = txvq->vq;
673 struct vring_packed_desc *dp;
674 struct vq_desc_extra *dxp;
675 uint16_t idx, id, flags;
676 uint16_t head_size = vq->hw->vtnet_hdr_size;
677 struct virtio_net_hdr *hdr;
679 id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
680 idx = vq->vq_avail_idx;
681 dp = &vq->vq_packed.ring.desc[idx];
683 dxp = &vq->vq_descx[id];
685 dxp->cookie = cookie;
687 flags = vq->vq_packed.cached_flags;
689 /* prepend cannot fail, checked by caller */
690 hdr = (struct virtio_net_hdr *)
691 rte_pktmbuf_prepend(cookie, head_size);
692 cookie->pkt_len -= head_size;
694 /* if offload disabled, hdr is not zeroed yet, do it now */
695 if (!vq->hw->has_tx_offload)
696 virtqueue_clear_net_hdr(hdr);
698 virtqueue_xmit_offload(hdr, cookie, true);
700 dp->addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
701 dp->len = cookie->data_len;
704 if (++vq->vq_avail_idx >= vq->vq_nentries) {
705 vq->vq_avail_idx -= vq->vq_nentries;
706 vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED;
712 vq->vq_desc_head_idx = dxp->next;
713 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
714 vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
717 virtio_wmb(vq->hw->weak_barriers);
722 virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
723 uint16_t needed, int can_push, int in_order)
725 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
726 struct vq_desc_extra *dxp;
727 struct virtqueue *vq = txvq->vq;
728 struct vring_packed_desc *start_dp, *head_dp;
729 uint16_t idx, id, head_idx, head_flags;
730 uint16_t head_size = vq->hw->vtnet_hdr_size;
731 struct virtio_net_hdr *hdr;
734 id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
736 dxp = &vq->vq_descx[id];
737 dxp->ndescs = needed;
738 dxp->cookie = cookie;
740 head_idx = vq->vq_avail_idx;
743 start_dp = vq->vq_packed.ring.desc;
745 head_dp = &vq->vq_packed.ring.desc[idx];
746 head_flags = cookie->next ? VRING_DESC_F_NEXT : 0;
747 head_flags |= vq->vq_packed.cached_flags;
750 /* prepend cannot fail, checked by caller */
751 hdr = (struct virtio_net_hdr *)
752 rte_pktmbuf_prepend(cookie, head_size);
753 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
754 * which is wrong. Below subtract restores correct pkt size.
756 cookie->pkt_len -= head_size;
758 /* if offload disabled, it is not zeroed below, do it now */
759 if (!vq->hw->has_tx_offload)
760 virtqueue_clear_net_hdr(hdr);
762 /* setup first tx ring slot to point to header
763 * stored in reserved region.
765 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
766 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
767 start_dp[idx].len = vq->hw->vtnet_hdr_size;
768 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
770 if (idx >= vq->vq_nentries) {
771 idx -= vq->vq_nentries;
772 vq->vq_packed.cached_flags ^=
773 VRING_PACKED_DESC_F_AVAIL_USED;
777 virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
782 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
783 start_dp[idx].len = cookie->data_len;
784 if (likely(idx != head_idx)) {
785 flags = cookie->next ? VRING_DESC_F_NEXT : 0;
786 flags |= vq->vq_packed.cached_flags;
787 start_dp[idx].flags = flags;
791 if (idx >= vq->vq_nentries) {
792 idx -= vq->vq_nentries;
793 vq->vq_packed.cached_flags ^=
794 VRING_PACKED_DESC_F_AVAIL_USED;
796 } while ((cookie = cookie->next) != NULL);
798 start_dp[prev].id = id;
800 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
801 vq->vq_avail_idx = idx;
804 vq->vq_desc_head_idx = dxp->next;
805 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
806 vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
809 virtio_wmb(vq->hw->weak_barriers);
810 head_dp->flags = head_flags;
814 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
815 uint16_t needed, int use_indirect, int can_push,
818 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
819 struct vq_desc_extra *dxp;
820 struct virtqueue *vq = txvq->vq;
821 struct vring_desc *start_dp;
822 uint16_t seg_num = cookie->nb_segs;
823 uint16_t head_idx, idx;
824 uint16_t head_size = vq->hw->vtnet_hdr_size;
825 struct virtio_net_hdr *hdr;
827 head_idx = vq->vq_desc_head_idx;
830 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
832 dxp = &vq->vq_descx[idx];
833 dxp->cookie = (void *)cookie;
834 dxp->ndescs = needed;
836 start_dp = vq->vq_split.ring.desc;
839 /* prepend cannot fail, checked by caller */
840 hdr = (struct virtio_net_hdr *)
841 rte_pktmbuf_prepend(cookie, head_size);
842 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
843 * which is wrong. Below subtract restores correct pkt size.
845 cookie->pkt_len -= head_size;
847 /* if offload disabled, it is not zeroed below, do it now */
848 if (!vq->hw->has_tx_offload)
849 virtqueue_clear_net_hdr(hdr);
850 } else if (use_indirect) {
851 /* setup tx ring slot to point to indirect
852 * descriptor list stored in reserved region.
854 * the first slot in indirect ring is already preset
855 * to point to the header in reserved region
857 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
858 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
859 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
860 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
861 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
863 /* loop below will fill in rest of the indirect elements */
864 start_dp = txr[idx].tx_indir;
867 /* setup first tx ring slot to point to header
868 * stored in reserved region.
870 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
871 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
872 start_dp[idx].len = vq->hw->vtnet_hdr_size;
873 start_dp[idx].flags = VRING_DESC_F_NEXT;
874 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
876 idx = start_dp[idx].next;
879 virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
882 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
883 start_dp[idx].len = cookie->data_len;
884 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
885 idx = start_dp[idx].next;
886 } while ((cookie = cookie->next) != NULL);
889 idx = vq->vq_split.ring.desc[head_idx].next;
891 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
893 vq->vq_desc_head_idx = idx;
894 vq_update_avail_ring(vq, head_idx);
897 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
898 vq->vq_desc_tail_idx = idx;
903 virtio_dev_cq_start(struct rte_eth_dev *dev)
905 struct virtio_hw *hw = dev->data->dev_private;
907 if (hw->cvq && hw->cvq->vq) {
908 rte_spinlock_init(&hw->cvq->lock);
909 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
914 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
917 unsigned int socket_id __rte_unused,
918 const struct rte_eth_rxconf *rx_conf __rte_unused,
919 struct rte_mempool *mp)
921 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
922 struct virtio_hw *hw = dev->data->dev_private;
923 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
924 struct virtnet_rx *rxvq;
926 PMD_INIT_FUNC_TRACE();
928 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
929 nb_desc = vq->vq_nentries;
930 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
933 rxvq->queue_id = queue_idx;
935 dev->data->rx_queues[queue_idx] = rxvq;
941 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
943 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
944 struct virtio_hw *hw = dev->data->dev_private;
945 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
946 struct virtnet_rx *rxvq = &vq->rxq;
951 PMD_INIT_FUNC_TRACE();
953 /* Allocate blank mbufs for the each rx descriptor */
956 if (hw->use_simple_rx) {
957 for (desc_idx = 0; desc_idx < vq->vq_nentries;
959 vq->vq_split.ring.avail->ring[desc_idx] = desc_idx;
960 vq->vq_split.ring.desc[desc_idx].flags =
964 virtio_rxq_vec_setup(rxvq);
967 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
968 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
970 vq->sw_ring[vq->vq_nentries + desc_idx] =
974 if (hw->use_simple_rx) {
975 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
976 virtio_rxq_rearm_vec(rxvq);
977 nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
979 } else if (hw->use_inorder_rx) {
980 if ((!virtqueue_full(vq))) {
981 uint16_t free_cnt = vq->vq_free_cnt;
982 struct rte_mbuf *pkts[free_cnt];
984 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
986 error = virtqueue_enqueue_refill_inorder(vq,
989 if (unlikely(error)) {
990 for (i = 0; i < free_cnt; i++)
991 rte_pktmbuf_free(pkts[i]);
996 vq_update_avail_idx(vq);
999 while (!virtqueue_full(vq)) {
1000 m = rte_mbuf_raw_alloc(rxvq->mpool);
1004 /* Enqueue allocated buffers */
1005 if (vtpci_packed_queue(vq->hw))
1006 error = virtqueue_enqueue_recv_refill_packed(vq,
1009 error = virtqueue_enqueue_recv_refill(vq,
1012 rte_pktmbuf_free(m);
1018 if (!vtpci_packed_queue(vq->hw))
1019 vq_update_avail_idx(vq);
1022 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
1030 * struct rte_eth_dev *dev: Used to update dev
1031 * uint16_t nb_desc: Defaults to values read from config space
1032 * unsigned int socket_id: Used to allocate memzone
1033 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
1034 * uint16_t queue_idx: Just used as an index in dev txq list
1037 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
1040 unsigned int socket_id __rte_unused,
1041 const struct rte_eth_txconf *tx_conf)
1043 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1044 struct virtio_hw *hw = dev->data->dev_private;
1045 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1046 struct virtnet_tx *txvq;
1047 uint16_t tx_free_thresh;
1049 PMD_INIT_FUNC_TRACE();
1051 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
1052 nb_desc = vq->vq_nentries;
1053 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
1056 txvq->queue_id = queue_idx;
1058 tx_free_thresh = tx_conf->tx_free_thresh;
1059 if (tx_free_thresh == 0)
1061 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
1063 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
1064 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
1065 "number of TX entries minus 3 (%u)."
1066 " (tx_free_thresh=%u port=%u queue=%u)\n",
1067 vq->vq_nentries - 3,
1068 tx_free_thresh, dev->data->port_id, queue_idx);
1072 vq->vq_free_thresh = tx_free_thresh;
1074 dev->data->tx_queues[queue_idx] = txvq;
1079 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
1082 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1083 struct virtio_hw *hw = dev->data->dev_private;
1084 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1086 PMD_INIT_FUNC_TRACE();
1088 if (!vtpci_packed_queue(hw)) {
1089 if (hw->use_inorder_tx)
1090 vq->vq_split.ring.desc[vq->vq_nentries - 1].next = 0;
1099 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
1103 * Requeue the discarded mbuf. This should always be
1104 * successful since it was just dequeued.
1106 if (vtpci_packed_queue(vq->hw))
1107 error = virtqueue_enqueue_recv_refill_packed(vq, &m, 1);
1109 error = virtqueue_enqueue_recv_refill(vq, &m, 1);
1111 if (unlikely(error)) {
1112 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
1113 rte_pktmbuf_free(m);
1118 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
1122 error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
1123 if (unlikely(error)) {
1124 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
1125 rte_pktmbuf_free(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]);
1521 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1526 /* Last packet still need merge segments */
1527 while (seg_res != 0) {
1528 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1529 VIRTIO_MBUF_BURST_SZ);
1531 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1532 virtio_rmb(hw->weak_barriers);
1533 num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1535 uint16_t extra_idx = 0;
1538 while (extra_idx < rcv_cnt) {
1539 rxm = rcv_pkts[extra_idx];
1541 RTE_PKTMBUF_HEADROOM - hdr_size;
1542 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1543 rxm->data_len = (uint16_t)(len[extra_idx]);
1546 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1552 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1557 "No enough segments for packet.");
1558 rte_pktmbuf_free(rx_pkts[nb_rx]);
1559 rxvq->stats.errors++;
1564 rxvq->stats.packets += nb_rx;
1566 /* Allocate new mbuf for the used descriptor */
1568 if (likely(!virtqueue_full(vq))) {
1569 /* free_cnt may include mrg descs */
1570 uint16_t free_cnt = vq->vq_free_cnt;
1571 struct rte_mbuf *new_pkts[free_cnt];
1573 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1574 error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1576 if (unlikely(error)) {
1577 for (i = 0; i < free_cnt; i++)
1578 rte_pktmbuf_free(new_pkts[i]);
1580 nb_enqueued += free_cnt;
1582 struct rte_eth_dev *dev =
1583 &rte_eth_devices[rxvq->port_id];
1584 dev->data->rx_mbuf_alloc_failed += free_cnt;
1588 if (likely(nb_enqueued)) {
1589 vq_update_avail_idx(vq);
1591 if (unlikely(virtqueue_kick_prepare(vq))) {
1592 virtqueue_notify(vq);
1593 PMD_RX_LOG(DEBUG, "Notified");
1601 virtio_recv_mergeable_pkts(void *rx_queue,
1602 struct rte_mbuf **rx_pkts,
1605 struct virtnet_rx *rxvq = rx_queue;
1606 struct virtqueue *vq = rxvq->vq;
1607 struct virtio_hw *hw = vq->hw;
1608 struct rte_mbuf *rxm;
1609 struct rte_mbuf *prev = NULL;
1610 uint16_t nb_used, num, nb_rx = 0;
1611 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1612 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1614 uint32_t nb_enqueued = 0;
1615 uint32_t seg_num = 0;
1616 uint32_t seg_res = 0;
1617 uint32_t hdr_size = hw->vtnet_hdr_size;
1620 if (unlikely(hw->started == 0))
1623 nb_used = VIRTQUEUE_NUSED(vq);
1625 virtio_rmb(hw->weak_barriers);
1627 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1629 num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1630 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1631 num = VIRTIO_MBUF_BURST_SZ;
1632 if (likely(num > DESC_PER_CACHELINE))
1633 num = num - ((vq->vq_used_cons_idx + num) %
1634 DESC_PER_CACHELINE);
1637 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1639 for (i = 0; i < num; i++) {
1640 struct virtio_net_hdr_mrg_rxbuf *header;
1642 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1643 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1647 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1648 PMD_RX_LOG(ERR, "Packet drop");
1650 virtio_discard_rxbuf(vq, rxm);
1651 rxvq->stats.errors++;
1655 header = (struct virtio_net_hdr_mrg_rxbuf *)
1656 ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1658 seg_num = header->num_buffers;
1662 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1663 rxm->nb_segs = seg_num;
1666 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1667 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1669 rxm->port = rxvq->port_id;
1671 rx_pkts[nb_rx] = rxm;
1674 if (hw->has_rx_offload &&
1675 virtio_rx_offload(rxm, &header->hdr) < 0) {
1676 virtio_discard_rxbuf(vq, rxm);
1677 rxvq->stats.errors++;
1682 rte_vlan_strip(rx_pkts[nb_rx]);
1684 seg_res = seg_num - 1;
1686 /* Merge remaining segments */
1687 while (seg_res != 0 && i < (num - 1)) {
1691 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1692 rxm->pkt_len = (uint32_t)(len[i]);
1693 rxm->data_len = (uint16_t)(len[i]);
1695 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1703 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1708 /* Last packet still need merge segments */
1709 while (seg_res != 0) {
1710 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1711 VIRTIO_MBUF_BURST_SZ);
1713 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1714 virtio_rmb(hw->weak_barriers);
1715 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,
1717 uint16_t extra_idx = 0;
1720 while (extra_idx < rcv_cnt) {
1721 rxm = rcv_pkts[extra_idx];
1723 RTE_PKTMBUF_HEADROOM - hdr_size;
1724 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1725 rxm->data_len = (uint16_t)(len[extra_idx]);
1728 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1734 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1739 "No enough segments for packet.");
1740 rte_pktmbuf_free(rx_pkts[nb_rx]);
1741 rxvq->stats.errors++;
1746 rxvq->stats.packets += nb_rx;
1748 /* Allocate new mbuf for the used descriptor */
1749 if (likely(!virtqueue_full(vq))) {
1750 /* free_cnt may include mrg descs */
1751 uint16_t free_cnt = vq->vq_free_cnt;
1752 struct rte_mbuf *new_pkts[free_cnt];
1754 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1755 error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1757 if (unlikely(error)) {
1758 for (i = 0; i < free_cnt; i++)
1759 rte_pktmbuf_free(new_pkts[i]);
1761 nb_enqueued += free_cnt;
1763 struct rte_eth_dev *dev =
1764 &rte_eth_devices[rxvq->port_id];
1765 dev->data->rx_mbuf_alloc_failed += free_cnt;
1769 if (likely(nb_enqueued)) {
1770 vq_update_avail_idx(vq);
1772 if (unlikely(virtqueue_kick_prepare(vq))) {
1773 virtqueue_notify(vq);
1774 PMD_RX_LOG(DEBUG, "Notified");
1782 virtio_recv_mergeable_pkts_packed(void *rx_queue,
1783 struct rte_mbuf **rx_pkts,
1786 struct virtnet_rx *rxvq = rx_queue;
1787 struct virtqueue *vq = rxvq->vq;
1788 struct virtio_hw *hw = vq->hw;
1789 struct rte_mbuf *rxm;
1790 struct rte_mbuf *prev = NULL;
1791 uint16_t num, nb_rx = 0;
1792 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1793 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1794 uint32_t nb_enqueued = 0;
1795 uint32_t seg_num = 0;
1796 uint32_t seg_res = 0;
1797 uint32_t hdr_size = hw->vtnet_hdr_size;
1801 if (unlikely(hw->started == 0))
1806 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1807 num = VIRTIO_MBUF_BURST_SZ;
1808 if (likely(num > DESC_PER_CACHELINE))
1809 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1811 num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1813 for (i = 0; i < num; i++) {
1814 struct virtio_net_hdr_mrg_rxbuf *header;
1816 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1817 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1821 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1822 PMD_RX_LOG(ERR, "Packet drop");
1824 virtio_discard_rxbuf(vq, rxm);
1825 rxvq->stats.errors++;
1829 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)
1830 rxm->buf_addr + RTE_PKTMBUF_HEADROOM - hdr_size);
1831 seg_num = header->num_buffers;
1836 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1837 rxm->nb_segs = seg_num;
1840 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1841 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1843 rxm->port = rxvq->port_id;
1844 rx_pkts[nb_rx] = rxm;
1847 if (hw->has_rx_offload &&
1848 virtio_rx_offload(rxm, &header->hdr) < 0) {
1849 virtio_discard_rxbuf(vq, rxm);
1850 rxvq->stats.errors++;
1855 rte_vlan_strip(rx_pkts[nb_rx]);
1857 seg_res = seg_num - 1;
1859 /* Merge remaining segments */
1860 while (seg_res != 0 && i < (num - 1)) {
1864 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1865 rxm->pkt_len = (uint32_t)(len[i]);
1866 rxm->data_len = (uint16_t)(len[i]);
1868 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1876 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1881 /* Last packet still need merge segments */
1882 while (seg_res != 0) {
1883 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1884 VIRTIO_MBUF_BURST_SZ);
1885 uint16_t extra_idx = 0;
1887 rcv_cnt = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
1889 if (unlikely(rcv_cnt == 0)) {
1890 PMD_RX_LOG(ERR, "No enough segments for packet.");
1891 rte_pktmbuf_free(rx_pkts[nb_rx]);
1892 rxvq->stats.errors++;
1896 while (extra_idx < rcv_cnt) {
1897 rxm = rcv_pkts[extra_idx];
1899 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1900 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1901 rxm->data_len = (uint16_t)(len[extra_idx]);
1905 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1910 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1915 rxvq->stats.packets += nb_rx;
1917 /* Allocate new mbuf for the used descriptor */
1918 if (likely(!virtqueue_full(vq))) {
1919 /* free_cnt may include mrg descs */
1920 uint16_t free_cnt = vq->vq_free_cnt;
1921 struct rte_mbuf *new_pkts[free_cnt];
1923 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1924 error = virtqueue_enqueue_recv_refill_packed(vq,
1925 new_pkts, free_cnt);
1926 if (unlikely(error)) {
1927 for (i = 0; i < free_cnt; i++)
1928 rte_pktmbuf_free(new_pkts[i]);
1930 nb_enqueued += free_cnt;
1932 struct rte_eth_dev *dev =
1933 &rte_eth_devices[rxvq->port_id];
1934 dev->data->rx_mbuf_alloc_failed += free_cnt;
1938 if (likely(nb_enqueued)) {
1939 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1940 virtqueue_notify(vq);
1941 PMD_RX_LOG(DEBUG, "Notified");
1949 virtio_xmit_pkts_prepare(void *tx_queue __rte_unused, struct rte_mbuf **tx_pkts,
1955 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1956 struct rte_mbuf *m = tx_pkts[nb_tx];
1958 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
1959 error = rte_validate_tx_offload(m);
1960 if (unlikely(error)) {
1966 /* Do VLAN tag insertion */
1967 if (unlikely(m->ol_flags & PKT_TX_VLAN_PKT)) {
1968 error = rte_vlan_insert(&m);
1969 /* rte_vlan_insert() may change pointer
1970 * even in the case of failure
1974 if (unlikely(error)) {
1980 error = rte_net_intel_cksum_prepare(m);
1981 if (unlikely(error)) {
1986 if (m->ol_flags & PKT_TX_TCP_SEG)
1987 virtio_tso_fix_cksum(m);
1994 virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
1997 struct virtnet_tx *txvq = tx_queue;
1998 struct virtqueue *vq = txvq->vq;
1999 struct virtio_hw *hw = vq->hw;
2000 uint16_t hdr_size = hw->vtnet_hdr_size;
2002 bool in_order = hw->use_inorder_tx;
2004 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2007 if (unlikely(nb_pkts < 1))
2010 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2012 if (nb_pkts > vq->vq_free_cnt)
2013 virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt,
2016 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2017 struct rte_mbuf *txm = tx_pkts[nb_tx];
2018 int can_push = 0, slots, need;
2020 /* optimize ring usage */
2021 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2022 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2023 rte_mbuf_refcnt_read(txm) == 1 &&
2024 RTE_MBUF_DIRECT(txm) &&
2025 txm->nb_segs == 1 &&
2026 rte_pktmbuf_headroom(txm) >= hdr_size &&
2027 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2028 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2031 /* How many main ring entries are needed to this Tx?
2032 * any_layout => number of segments
2033 * default => number of segments + 1
2035 slots = txm->nb_segs + !can_push;
2036 need = slots - vq->vq_free_cnt;
2038 /* Positive value indicates it need free vring descriptors */
2039 if (unlikely(need > 0)) {
2040 virtio_xmit_cleanup_packed(vq, need, in_order);
2041 need = slots - vq->vq_free_cnt;
2042 if (unlikely(need > 0)) {
2044 "No free tx descriptors to transmit");
2049 /* Enqueue Packet buffers */
2051 virtqueue_enqueue_xmit_packed_fast(txvq, txm, in_order);
2053 virtqueue_enqueue_xmit_packed(txvq, txm, slots, 0,
2056 virtio_update_packet_stats(&txvq->stats, txm);
2059 txvq->stats.packets += nb_tx;
2061 if (likely(nb_tx)) {
2062 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
2063 virtqueue_notify(vq);
2064 PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2072 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
2074 struct virtnet_tx *txvq = tx_queue;
2075 struct virtqueue *vq = txvq->vq;
2076 struct virtio_hw *hw = vq->hw;
2077 uint16_t hdr_size = hw->vtnet_hdr_size;
2078 uint16_t nb_used, nb_tx = 0;
2080 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2083 if (unlikely(nb_pkts < 1))
2086 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2087 nb_used = VIRTQUEUE_NUSED(vq);
2089 virtio_rmb(hw->weak_barriers);
2090 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2091 virtio_xmit_cleanup(vq, nb_used);
2093 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2094 struct rte_mbuf *txm = tx_pkts[nb_tx];
2095 int can_push = 0, use_indirect = 0, slots, need;
2097 /* optimize ring usage */
2098 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2099 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2100 rte_mbuf_refcnt_read(txm) == 1 &&
2101 RTE_MBUF_DIRECT(txm) &&
2102 txm->nb_segs == 1 &&
2103 rte_pktmbuf_headroom(txm) >= hdr_size &&
2104 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2105 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2107 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
2108 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
2111 /* How many main ring entries are needed to this Tx?
2112 * any_layout => number of segments
2114 * default => number of segments + 1
2116 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
2117 need = slots - vq->vq_free_cnt;
2119 /* Positive value indicates it need free vring descriptors */
2120 if (unlikely(need > 0)) {
2121 nb_used = VIRTQUEUE_NUSED(vq);
2122 virtio_rmb(hw->weak_barriers);
2123 need = RTE_MIN(need, (int)nb_used);
2125 virtio_xmit_cleanup(vq, need);
2126 need = slots - vq->vq_free_cnt;
2127 if (unlikely(need > 0)) {
2129 "No free tx descriptors to transmit");
2134 /* Enqueue Packet buffers */
2135 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
2138 virtio_update_packet_stats(&txvq->stats, txm);
2141 txvq->stats.packets += nb_tx;
2143 if (likely(nb_tx)) {
2144 vq_update_avail_idx(vq);
2146 if (unlikely(virtqueue_kick_prepare(vq))) {
2147 virtqueue_notify(vq);
2148 PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2155 static __rte_always_inline int
2156 virtio_xmit_try_cleanup_inorder(struct virtqueue *vq, uint16_t need)
2158 uint16_t nb_used, nb_clean, nb_descs;
2159 struct virtio_hw *hw = vq->hw;
2161 nb_descs = vq->vq_free_cnt + need;
2162 nb_used = VIRTQUEUE_NUSED(vq);
2163 virtio_rmb(hw->weak_barriers);
2164 nb_clean = RTE_MIN(need, (int)nb_used);
2166 virtio_xmit_cleanup_inorder(vq, nb_clean);
2168 return nb_descs - vq->vq_free_cnt;
2172 virtio_xmit_pkts_inorder(void *tx_queue,
2173 struct rte_mbuf **tx_pkts,
2176 struct virtnet_tx *txvq = tx_queue;
2177 struct virtqueue *vq = txvq->vq;
2178 struct virtio_hw *hw = vq->hw;
2179 uint16_t hdr_size = hw->vtnet_hdr_size;
2180 uint16_t nb_used, nb_tx = 0, nb_inorder_pkts = 0;
2181 struct rte_mbuf *inorder_pkts[nb_pkts];
2184 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2187 if (unlikely(nb_pkts < 1))
2191 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2192 nb_used = VIRTQUEUE_NUSED(vq);
2194 virtio_rmb(hw->weak_barriers);
2195 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2196 virtio_xmit_cleanup_inorder(vq, nb_used);
2198 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2199 struct rte_mbuf *txm = tx_pkts[nb_tx];
2202 /* optimize ring usage */
2203 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2204 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2205 rte_mbuf_refcnt_read(txm) == 1 &&
2206 RTE_MBUF_DIRECT(txm) &&
2207 txm->nb_segs == 1 &&
2208 rte_pktmbuf_headroom(txm) >= hdr_size &&
2209 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2210 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
2211 inorder_pkts[nb_inorder_pkts] = txm;
2217 if (nb_inorder_pkts) {
2218 need = nb_inorder_pkts - vq->vq_free_cnt;
2219 if (unlikely(need > 0)) {
2220 need = virtio_xmit_try_cleanup_inorder(vq,
2222 if (unlikely(need > 0)) {
2224 "No free tx descriptors to "
2229 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2231 nb_inorder_pkts = 0;
2234 slots = txm->nb_segs + 1;
2235 need = slots - vq->vq_free_cnt;
2236 if (unlikely(need > 0)) {
2237 need = virtio_xmit_try_cleanup_inorder(vq, slots);
2239 if (unlikely(need > 0)) {
2241 "No free tx descriptors to transmit");
2245 /* Enqueue Packet buffers */
2246 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
2248 virtio_update_packet_stats(&txvq->stats, txm);
2251 /* Transmit all inorder packets */
2252 if (nb_inorder_pkts) {
2253 need = nb_inorder_pkts - vq->vq_free_cnt;
2254 if (unlikely(need > 0)) {
2255 need = virtio_xmit_try_cleanup_inorder(vq,
2257 if (unlikely(need > 0)) {
2259 "No free tx descriptors to transmit");
2260 nb_inorder_pkts = vq->vq_free_cnt;
2265 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2269 txvq->stats.packets += nb_tx;
2271 if (likely(nb_tx)) {
2272 vq_update_avail_idx(vq);
2274 if (unlikely(virtqueue_kick_prepare(vq))) {
2275 virtqueue_notify(vq);
2276 PMD_TX_LOG(DEBUG, "Notified backend after xmit");