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 /* desc_is_used has a load-acquire or rte_cio_rmb inside
168 * and wait for used desc in virtqueue.
170 if (!desc_is_used(&desc[used_idx], vq))
172 len[i] = desc[used_idx].len;
173 id = desc[used_idx].id;
174 cookie = (struct rte_mbuf *)vq->vq_descx[id].cookie;
175 if (unlikely(cookie == NULL)) {
176 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
177 vq->vq_used_cons_idx);
180 rte_prefetch0(cookie);
181 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
185 vq->vq_used_cons_idx++;
186 if (vq->vq_used_cons_idx >= vq->vq_nentries) {
187 vq->vq_used_cons_idx -= vq->vq_nentries;
188 vq->vq_packed.used_wrap_counter ^= 1;
196 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
197 uint32_t *len, uint16_t num)
199 struct vring_used_elem *uep;
200 struct rte_mbuf *cookie;
201 uint16_t used_idx, desc_idx;
204 /* Caller does the check */
205 for (i = 0; i < num ; i++) {
206 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
207 uep = &vq->vq_split.ring.used->ring[used_idx];
208 desc_idx = (uint16_t) uep->id;
210 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
212 if (unlikely(cookie == NULL)) {
213 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
214 vq->vq_used_cons_idx);
218 rte_prefetch0(cookie);
219 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
221 vq->vq_used_cons_idx++;
222 vq_ring_free_chain(vq, desc_idx);
223 vq->vq_descx[desc_idx].cookie = NULL;
230 virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
231 struct rte_mbuf **rx_pkts,
235 struct vring_used_elem *uep;
236 struct rte_mbuf *cookie;
237 uint16_t used_idx = 0;
240 if (unlikely(num == 0))
243 for (i = 0; i < num; i++) {
244 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
245 /* Desc idx same as used idx */
246 uep = &vq->vq_split.ring.used->ring[used_idx];
248 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
250 if (unlikely(cookie == NULL)) {
251 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
252 vq->vq_used_cons_idx);
256 rte_prefetch0(cookie);
257 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
259 vq->vq_used_cons_idx++;
260 vq->vq_descx[used_idx].cookie = NULL;
263 vq_ring_free_inorder(vq, used_idx, i);
267 #ifndef DEFAULT_TX_FREE_THRESH
268 #define DEFAULT_TX_FREE_THRESH 32
272 virtio_xmit_cleanup_inorder_packed(struct virtqueue *vq, int num)
274 uint16_t used_idx, id, curr_id, free_cnt = 0;
275 uint16_t size = vq->vq_nentries;
276 struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
277 struct vq_desc_extra *dxp;
279 used_idx = vq->vq_used_cons_idx;
280 /* desc_is_used has a load-acquire or rte_cio_rmb inside
281 * and wait for used desc in virtqueue.
283 while (num > 0 && desc_is_used(&desc[used_idx], vq)) {
284 id = desc[used_idx].id;
287 dxp = &vq->vq_descx[used_idx];
288 used_idx += dxp->ndescs;
289 free_cnt += dxp->ndescs;
291 if (used_idx >= size) {
293 vq->vq_packed.used_wrap_counter ^= 1;
295 if (dxp->cookie != NULL) {
296 rte_pktmbuf_free(dxp->cookie);
299 } while (curr_id != id);
301 vq->vq_used_cons_idx = used_idx;
302 vq->vq_free_cnt += free_cnt;
306 virtio_xmit_cleanup_normal_packed(struct virtqueue *vq, int num)
308 uint16_t used_idx, id;
309 uint16_t size = vq->vq_nentries;
310 struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
311 struct vq_desc_extra *dxp;
313 used_idx = vq->vq_used_cons_idx;
314 /* desc_is_used has a load-acquire or rte_cio_rmb inside
315 * and wait for used desc in virtqueue.
317 while (num-- && desc_is_used(&desc[used_idx], vq)) {
318 id = desc[used_idx].id;
319 dxp = &vq->vq_descx[id];
320 vq->vq_used_cons_idx += dxp->ndescs;
321 if (vq->vq_used_cons_idx >= size) {
322 vq->vq_used_cons_idx -= size;
323 vq->vq_packed.used_wrap_counter ^= 1;
325 vq_ring_free_id_packed(vq, id);
326 if (dxp->cookie != NULL) {
327 rte_pktmbuf_free(dxp->cookie);
330 used_idx = vq->vq_used_cons_idx;
334 /* Cleanup from completed transmits. */
336 virtio_xmit_cleanup_packed(struct virtqueue *vq, int num, int in_order)
339 virtio_xmit_cleanup_inorder_packed(vq, num);
341 virtio_xmit_cleanup_normal_packed(vq, num);
345 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
347 uint16_t i, used_idx, desc_idx;
348 for (i = 0; i < num; i++) {
349 struct vring_used_elem *uep;
350 struct vq_desc_extra *dxp;
352 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
353 uep = &vq->vq_split.ring.used->ring[used_idx];
355 desc_idx = (uint16_t) uep->id;
356 dxp = &vq->vq_descx[desc_idx];
357 vq->vq_used_cons_idx++;
358 vq_ring_free_chain(vq, desc_idx);
360 if (dxp->cookie != NULL) {
361 rte_pktmbuf_free(dxp->cookie);
367 /* Cleanup from completed inorder transmits. */
368 static __rte_always_inline void
369 virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num)
371 uint16_t i, idx = vq->vq_used_cons_idx;
372 int16_t free_cnt = 0;
373 struct vq_desc_extra *dxp = NULL;
375 if (unlikely(num == 0))
378 for (i = 0; i < num; i++) {
379 dxp = &vq->vq_descx[idx++ & (vq->vq_nentries - 1)];
380 free_cnt += dxp->ndescs;
381 if (dxp->cookie != NULL) {
382 rte_pktmbuf_free(dxp->cookie);
387 vq->vq_free_cnt += free_cnt;
388 vq->vq_used_cons_idx = idx;
392 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
393 struct rte_mbuf **cookies,
396 struct vq_desc_extra *dxp;
397 struct virtio_hw *hw = vq->hw;
398 struct vring_desc *start_dp;
399 uint16_t head_idx, idx, i = 0;
401 if (unlikely(vq->vq_free_cnt == 0))
403 if (unlikely(vq->vq_free_cnt < num))
406 head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
407 start_dp = vq->vq_split.ring.desc;
410 idx = head_idx & (vq->vq_nentries - 1);
411 dxp = &vq->vq_descx[idx];
412 dxp->cookie = (void *)cookies[i];
416 VIRTIO_MBUF_ADDR(cookies[i], vq) +
417 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
419 cookies[i]->buf_len -
420 RTE_PKTMBUF_HEADROOM +
422 start_dp[idx].flags = VRING_DESC_F_WRITE;
424 vq_update_avail_ring(vq, idx);
429 vq->vq_desc_head_idx += num;
430 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
435 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf **cookie,
438 struct vq_desc_extra *dxp;
439 struct virtio_hw *hw = vq->hw;
440 struct vring_desc *start_dp = vq->vq_split.ring.desc;
443 if (unlikely(vq->vq_free_cnt == 0))
445 if (unlikely(vq->vq_free_cnt < num))
448 if (unlikely(vq->vq_desc_head_idx >= vq->vq_nentries))
451 for (i = 0; i < num; i++) {
452 idx = vq->vq_desc_head_idx;
453 dxp = &vq->vq_descx[idx];
454 dxp->cookie = (void *)cookie[i];
458 VIRTIO_MBUF_ADDR(cookie[i], vq) +
459 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
461 cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM +
463 start_dp[idx].flags = VRING_DESC_F_WRITE;
464 vq->vq_desc_head_idx = start_dp[idx].next;
465 vq_update_avail_ring(vq, idx);
466 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) {
467 vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
472 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
478 virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq,
479 struct rte_mbuf **cookie, uint16_t num)
481 struct vring_packed_desc *start_dp = vq->vq_packed.ring.desc;
482 uint16_t flags = vq->vq_packed.cached_flags;
483 struct virtio_hw *hw = vq->hw;
484 struct vq_desc_extra *dxp;
488 if (unlikely(vq->vq_free_cnt == 0))
490 if (unlikely(vq->vq_free_cnt < num))
493 for (i = 0; i < num; i++) {
494 idx = vq->vq_avail_idx;
495 dxp = &vq->vq_descx[idx];
496 dxp->cookie = (void *)cookie[i];
499 start_dp[idx].addr = VIRTIO_MBUF_ADDR(cookie[i], vq) +
500 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
501 start_dp[idx].len = cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM
502 + hw->vtnet_hdr_size;
504 vq->vq_desc_head_idx = dxp->next;
505 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
506 vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
508 virtqueue_store_flags_packed(&start_dp[idx], flags,
511 if (++vq->vq_avail_idx >= vq->vq_nentries) {
512 vq->vq_avail_idx -= vq->vq_nentries;
513 vq->vq_packed.cached_flags ^=
514 VRING_PACKED_DESC_F_AVAIL_USED;
515 flags = vq->vq_packed.cached_flags;
518 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
522 /* When doing TSO, the IP length is not included in the pseudo header
523 * checksum of the packet given to the PMD, but for virtio it is
527 virtio_tso_fix_cksum(struct rte_mbuf *m)
529 /* common case: header is not fragmented */
530 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
532 struct rte_ipv4_hdr *iph;
533 struct rte_ipv6_hdr *ip6h;
534 struct rte_tcp_hdr *th;
535 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
538 iph = rte_pktmbuf_mtod_offset(m,
539 struct rte_ipv4_hdr *, m->l2_len);
540 th = RTE_PTR_ADD(iph, m->l3_len);
541 if ((iph->version_ihl >> 4) == 4) {
542 iph->hdr_checksum = 0;
543 iph->hdr_checksum = rte_ipv4_cksum(iph);
544 ip_len = iph->total_length;
545 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
548 ip6h = (struct rte_ipv6_hdr *)iph;
549 ip_paylen = ip6h->payload_len;
552 /* calculate the new phdr checksum not including ip_paylen */
553 prev_cksum = th->cksum;
556 tmp = (tmp & 0xffff) + (tmp >> 16);
559 /* replace it in the packet */
560 th->cksum = new_cksum;
565 /* avoid write operation when necessary, to lessen cache issues */
566 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
567 if ((var) != (val)) \
571 #define virtqueue_clear_net_hdr(_hdr) do { \
572 ASSIGN_UNLESS_EQUAL((_hdr)->csum_start, 0); \
573 ASSIGN_UNLESS_EQUAL((_hdr)->csum_offset, 0); \
574 ASSIGN_UNLESS_EQUAL((_hdr)->flags, 0); \
575 ASSIGN_UNLESS_EQUAL((_hdr)->gso_type, 0); \
576 ASSIGN_UNLESS_EQUAL((_hdr)->gso_size, 0); \
577 ASSIGN_UNLESS_EQUAL((_hdr)->hdr_len, 0); \
581 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
582 struct rte_mbuf *cookie,
586 if (cookie->ol_flags & PKT_TX_TCP_SEG)
587 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
589 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
590 case PKT_TX_UDP_CKSUM:
591 hdr->csum_start = cookie->l2_len + cookie->l3_len;
592 hdr->csum_offset = offsetof(struct rte_udp_hdr,
594 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
597 case PKT_TX_TCP_CKSUM:
598 hdr->csum_start = cookie->l2_len + cookie->l3_len;
599 hdr->csum_offset = offsetof(struct rte_tcp_hdr, cksum);
600 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
604 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
605 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
606 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
610 /* TCP Segmentation Offload */
611 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
612 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
613 VIRTIO_NET_HDR_GSO_TCPV6 :
614 VIRTIO_NET_HDR_GSO_TCPV4;
615 hdr->gso_size = cookie->tso_segsz;
621 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
622 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
623 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
629 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
630 struct rte_mbuf **cookies,
633 struct vq_desc_extra *dxp;
634 struct virtqueue *vq = txvq->vq;
635 struct vring_desc *start_dp;
636 struct virtio_net_hdr *hdr;
638 int16_t head_size = vq->hw->vtnet_hdr_size;
641 idx = vq->vq_desc_head_idx;
642 start_dp = vq->vq_split.ring.desc;
645 idx = idx & (vq->vq_nentries - 1);
646 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
647 dxp->cookie = (void *)cookies[i];
649 virtio_update_packet_stats(&txvq->stats, cookies[i]);
651 hdr = rte_pktmbuf_mtod_offset(cookies[i],
652 struct virtio_net_hdr *, -head_size);
654 /* if offload disabled, hdr is not zeroed yet, do it now */
655 if (!vq->hw->has_tx_offload)
656 virtqueue_clear_net_hdr(hdr);
658 virtqueue_xmit_offload(hdr, cookies[i], true);
661 VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq) - head_size;
662 start_dp[idx].len = cookies[i]->data_len + head_size;
663 start_dp[idx].flags = 0;
666 vq_update_avail_ring(vq, idx);
672 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
673 vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
677 virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq,
678 struct rte_mbuf *cookie,
681 struct virtqueue *vq = txvq->vq;
682 struct vring_packed_desc *dp;
683 struct vq_desc_extra *dxp;
684 uint16_t idx, id, flags;
685 int16_t head_size = vq->hw->vtnet_hdr_size;
686 struct virtio_net_hdr *hdr;
688 id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
689 idx = vq->vq_avail_idx;
690 dp = &vq->vq_packed.ring.desc[idx];
692 dxp = &vq->vq_descx[id];
694 dxp->cookie = cookie;
696 flags = vq->vq_packed.cached_flags;
698 /* prepend cannot fail, checked by caller */
699 hdr = rte_pktmbuf_mtod_offset(cookie, struct virtio_net_hdr *,
702 /* if offload disabled, hdr is not zeroed yet, do it now */
703 if (!vq->hw->has_tx_offload)
704 virtqueue_clear_net_hdr(hdr);
706 virtqueue_xmit_offload(hdr, cookie, true);
708 dp->addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq) - head_size;
709 dp->len = cookie->data_len + head_size;
712 if (++vq->vq_avail_idx >= vq->vq_nentries) {
713 vq->vq_avail_idx -= vq->vq_nentries;
714 vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED;
720 vq->vq_desc_head_idx = dxp->next;
721 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
722 vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
725 virtqueue_store_flags_packed(dp, flags, vq->hw->weak_barriers);
729 virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
730 uint16_t needed, int can_push, int in_order)
732 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
733 struct vq_desc_extra *dxp;
734 struct virtqueue *vq = txvq->vq;
735 struct vring_packed_desc *start_dp, *head_dp;
736 uint16_t idx, id, head_idx, head_flags;
737 int16_t head_size = vq->hw->vtnet_hdr_size;
738 struct virtio_net_hdr *hdr;
740 bool prepend_header = false;
742 id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
744 dxp = &vq->vq_descx[id];
745 dxp->ndescs = needed;
746 dxp->cookie = cookie;
748 head_idx = vq->vq_avail_idx;
751 start_dp = vq->vq_packed.ring.desc;
753 head_dp = &vq->vq_packed.ring.desc[idx];
754 head_flags = cookie->next ? VRING_DESC_F_NEXT : 0;
755 head_flags |= vq->vq_packed.cached_flags;
758 /* prepend cannot fail, checked by caller */
759 hdr = rte_pktmbuf_mtod_offset(cookie, struct virtio_net_hdr *,
761 prepend_header = true;
763 /* if offload disabled, it is not zeroed below, do it now */
764 if (!vq->hw->has_tx_offload)
765 virtqueue_clear_net_hdr(hdr);
767 /* setup first tx ring slot to point to header
768 * stored in reserved region.
770 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
771 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
772 start_dp[idx].len = vq->hw->vtnet_hdr_size;
773 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
775 if (idx >= vq->vq_nentries) {
776 idx -= vq->vq_nentries;
777 vq->vq_packed.cached_flags ^=
778 VRING_PACKED_DESC_F_AVAIL_USED;
782 virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
787 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
788 start_dp[idx].len = cookie->data_len;
789 if (prepend_header) {
790 start_dp[idx].addr -= head_size;
791 start_dp[idx].len += head_size;
792 prepend_header = false;
795 if (likely(idx != head_idx)) {
796 flags = cookie->next ? VRING_DESC_F_NEXT : 0;
797 flags |= vq->vq_packed.cached_flags;
798 start_dp[idx].flags = flags;
802 if (idx >= vq->vq_nentries) {
803 idx -= vq->vq_nentries;
804 vq->vq_packed.cached_flags ^=
805 VRING_PACKED_DESC_F_AVAIL_USED;
807 } while ((cookie = cookie->next) != NULL);
809 start_dp[prev].id = id;
811 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
812 vq->vq_avail_idx = idx;
815 vq->vq_desc_head_idx = dxp->next;
816 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
817 vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
820 virtqueue_store_flags_packed(head_dp, head_flags,
821 vq->hw->weak_barriers);
825 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
826 uint16_t needed, int use_indirect, int can_push,
829 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
830 struct vq_desc_extra *dxp;
831 struct virtqueue *vq = txvq->vq;
832 struct vring_desc *start_dp;
833 uint16_t seg_num = cookie->nb_segs;
834 uint16_t head_idx, idx;
835 int16_t head_size = vq->hw->vtnet_hdr_size;
836 bool prepend_header = false;
837 struct virtio_net_hdr *hdr;
839 head_idx = vq->vq_desc_head_idx;
842 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
844 dxp = &vq->vq_descx[idx];
845 dxp->cookie = (void *)cookie;
846 dxp->ndescs = needed;
848 start_dp = vq->vq_split.ring.desc;
851 /* prepend cannot fail, checked by caller */
852 hdr = rte_pktmbuf_mtod_offset(cookie, struct virtio_net_hdr *,
854 prepend_header = true;
856 /* if offload disabled, it is not zeroed below, do it now */
857 if (!vq->hw->has_tx_offload)
858 virtqueue_clear_net_hdr(hdr);
859 } else if (use_indirect) {
860 /* setup tx ring slot to point to indirect
861 * descriptor list stored in reserved region.
863 * the first slot in indirect ring is already preset
864 * to point to the header in reserved region
866 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
867 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
868 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
869 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
870 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
872 /* loop below will fill in rest of the indirect elements */
873 start_dp = txr[idx].tx_indir;
876 /* setup first tx ring slot to point to header
877 * stored in reserved region.
879 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
880 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
881 start_dp[idx].len = vq->hw->vtnet_hdr_size;
882 start_dp[idx].flags = VRING_DESC_F_NEXT;
883 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
885 idx = start_dp[idx].next;
888 virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
891 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
892 start_dp[idx].len = cookie->data_len;
893 if (prepend_header) {
894 start_dp[idx].addr -= head_size;
895 start_dp[idx].len += head_size;
896 prepend_header = false;
898 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
899 idx = start_dp[idx].next;
900 } while ((cookie = cookie->next) != NULL);
903 idx = vq->vq_split.ring.desc[head_idx].next;
905 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
907 vq->vq_desc_head_idx = idx;
908 vq_update_avail_ring(vq, head_idx);
911 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
912 vq->vq_desc_tail_idx = idx;
917 virtio_dev_cq_start(struct rte_eth_dev *dev)
919 struct virtio_hw *hw = dev->data->dev_private;
921 if (hw->cvq && hw->cvq->vq) {
922 rte_spinlock_init(&hw->cvq->lock);
923 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
928 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
931 unsigned int socket_id __rte_unused,
932 const struct rte_eth_rxconf *rx_conf,
933 struct rte_mempool *mp)
935 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
936 struct virtio_hw *hw = dev->data->dev_private;
937 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
938 struct virtnet_rx *rxvq;
940 PMD_INIT_FUNC_TRACE();
942 if (rx_conf->rx_deferred_start) {
943 PMD_INIT_LOG(ERR, "Rx deferred start is not supported");
947 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
948 nb_desc = vq->vq_nentries;
949 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
952 rxvq->queue_id = queue_idx;
954 dev->data->rx_queues[queue_idx] = rxvq;
960 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
962 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
963 struct virtio_hw *hw = dev->data->dev_private;
964 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
965 struct virtnet_rx *rxvq = &vq->rxq;
970 PMD_INIT_FUNC_TRACE();
972 /* Allocate blank mbufs for the each rx descriptor */
975 if (hw->use_simple_rx) {
976 for (desc_idx = 0; desc_idx < vq->vq_nentries;
978 vq->vq_split.ring.avail->ring[desc_idx] = desc_idx;
979 vq->vq_split.ring.desc[desc_idx].flags =
983 virtio_rxq_vec_setup(rxvq);
986 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
987 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
989 vq->sw_ring[vq->vq_nentries + desc_idx] =
993 if (hw->use_simple_rx) {
994 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
995 virtio_rxq_rearm_vec(rxvq);
996 nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
998 } else if (hw->use_inorder_rx) {
999 if ((!virtqueue_full(vq))) {
1000 uint16_t free_cnt = vq->vq_free_cnt;
1001 struct rte_mbuf *pkts[free_cnt];
1003 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
1005 error = virtqueue_enqueue_refill_inorder(vq,
1008 if (unlikely(error)) {
1009 for (i = 0; i < free_cnt; i++)
1010 rte_pktmbuf_free(pkts[i]);
1015 vq_update_avail_idx(vq);
1018 while (!virtqueue_full(vq)) {
1019 m = rte_mbuf_raw_alloc(rxvq->mpool);
1023 /* Enqueue allocated buffers */
1024 if (vtpci_packed_queue(vq->hw))
1025 error = virtqueue_enqueue_recv_refill_packed(vq,
1028 error = virtqueue_enqueue_recv_refill(vq,
1031 rte_pktmbuf_free(m);
1037 if (!vtpci_packed_queue(vq->hw))
1038 vq_update_avail_idx(vq);
1041 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
1049 * struct rte_eth_dev *dev: Used to update dev
1050 * uint16_t nb_desc: Defaults to values read from config space
1051 * unsigned int socket_id: Used to allocate memzone
1052 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
1053 * uint16_t queue_idx: Just used as an index in dev txq list
1056 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
1059 unsigned int socket_id __rte_unused,
1060 const struct rte_eth_txconf *tx_conf)
1062 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1063 struct virtio_hw *hw = dev->data->dev_private;
1064 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1065 struct virtnet_tx *txvq;
1066 uint16_t tx_free_thresh;
1068 PMD_INIT_FUNC_TRACE();
1070 if (tx_conf->tx_deferred_start) {
1071 PMD_INIT_LOG(ERR, "Tx deferred start is not supported");
1075 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
1076 nb_desc = vq->vq_nentries;
1077 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
1080 txvq->queue_id = queue_idx;
1082 tx_free_thresh = tx_conf->tx_free_thresh;
1083 if (tx_free_thresh == 0)
1085 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
1087 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
1088 PMD_DRV_LOG(ERR, "tx_free_thresh must be less than the "
1089 "number of TX entries minus 3 (%u)."
1090 " (tx_free_thresh=%u port=%u queue=%u)\n",
1091 vq->vq_nentries - 3,
1092 tx_free_thresh, dev->data->port_id, queue_idx);
1096 vq->vq_free_thresh = tx_free_thresh;
1098 dev->data->tx_queues[queue_idx] = txvq;
1103 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
1106 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1107 struct virtio_hw *hw = dev->data->dev_private;
1108 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1110 PMD_INIT_FUNC_TRACE();
1112 if (!vtpci_packed_queue(hw)) {
1113 if (hw->use_inorder_tx)
1114 vq->vq_split.ring.desc[vq->vq_nentries - 1].next = 0;
1123 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
1127 * Requeue the discarded mbuf. This should always be
1128 * successful since it was just dequeued.
1130 if (vtpci_packed_queue(vq->hw))
1131 error = virtqueue_enqueue_recv_refill_packed(vq, &m, 1);
1133 error = virtqueue_enqueue_recv_refill(vq, &m, 1);
1135 if (unlikely(error)) {
1136 PMD_DRV_LOG(ERR, "cannot requeue discarded mbuf");
1137 rte_pktmbuf_free(m);
1142 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
1146 error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
1147 if (unlikely(error)) {
1148 PMD_DRV_LOG(ERR, "cannot requeue discarded mbuf");
1149 rte_pktmbuf_free(m);
1153 /* Optionally fill offload information in structure */
1155 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
1157 struct rte_net_hdr_lens hdr_lens;
1158 uint32_t hdrlen, ptype;
1159 int l4_supported = 0;
1162 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1165 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
1167 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
1168 m->packet_type = ptype;
1169 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
1170 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
1171 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
1174 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1175 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
1176 if (hdr->csum_start <= hdrlen && l4_supported) {
1177 m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
1179 /* Unknown proto or tunnel, do sw cksum. We can assume
1180 * the cksum field is in the first segment since the
1181 * buffers we provided to the host are large enough.
1182 * In case of SCTP, this will be wrong since it's a CRC
1183 * but there's nothing we can do.
1185 uint16_t csum = 0, off;
1187 rte_raw_cksum_mbuf(m, hdr->csum_start,
1188 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
1190 if (likely(csum != 0xffff))
1192 off = hdr->csum_offset + hdr->csum_start;
1193 if (rte_pktmbuf_data_len(m) >= off + 1)
1194 *rte_pktmbuf_mtod_offset(m, uint16_t *,
1197 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
1198 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
1201 /* GSO request, save required information in mbuf */
1202 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1203 /* Check unsupported modes */
1204 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
1205 (hdr->gso_size == 0)) {
1209 /* Update mss lengthes in mbuf */
1210 m->tso_segsz = hdr->gso_size;
1211 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1212 case VIRTIO_NET_HDR_GSO_TCPV4:
1213 case VIRTIO_NET_HDR_GSO_TCPV6:
1214 m->ol_flags |= PKT_RX_LRO | \
1215 PKT_RX_L4_CKSUM_NONE;
1225 #define VIRTIO_MBUF_BURST_SZ 64
1226 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
1228 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
1230 struct virtnet_rx *rxvq = rx_queue;
1231 struct virtqueue *vq = rxvq->vq;
1232 struct virtio_hw *hw = vq->hw;
1233 struct rte_mbuf *rxm;
1234 uint16_t nb_used, num, nb_rx;
1235 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1236 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1238 uint32_t i, nb_enqueued;
1240 struct virtio_net_hdr *hdr;
1243 if (unlikely(hw->started == 0))
1246 nb_used = VIRTQUEUE_NUSED(vq);
1248 virtio_rmb(hw->weak_barriers);
1250 num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1251 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1252 num = VIRTIO_MBUF_BURST_SZ;
1253 if (likely(num > DESC_PER_CACHELINE))
1254 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1256 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1257 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
1260 hdr_size = hw->vtnet_hdr_size;
1262 for (i = 0; i < num ; i++) {
1265 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1267 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1268 PMD_RX_LOG(ERR, "Packet drop");
1270 virtio_discard_rxbuf(vq, rxm);
1271 rxvq->stats.errors++;
1275 rxm->port = rxvq->port_id;
1276 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1280 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1281 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1283 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1284 RTE_PKTMBUF_HEADROOM - hdr_size);
1287 rte_vlan_strip(rxm);
1289 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1290 virtio_discard_rxbuf(vq, rxm);
1291 rxvq->stats.errors++;
1295 virtio_rx_stats_updated(rxvq, rxm);
1297 rx_pkts[nb_rx++] = rxm;
1300 rxvq->stats.packets += nb_rx;
1302 /* Allocate new mbuf for the used descriptor */
1303 if (likely(!virtqueue_full(vq))) {
1304 uint16_t free_cnt = vq->vq_free_cnt;
1305 struct rte_mbuf *new_pkts[free_cnt];
1307 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1309 error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1311 if (unlikely(error)) {
1312 for (i = 0; i < free_cnt; i++)
1313 rte_pktmbuf_free(new_pkts[i]);
1315 nb_enqueued += free_cnt;
1317 struct rte_eth_dev *dev =
1318 &rte_eth_devices[rxvq->port_id];
1319 dev->data->rx_mbuf_alloc_failed += free_cnt;
1323 if (likely(nb_enqueued)) {
1324 vq_update_avail_idx(vq);
1326 if (unlikely(virtqueue_kick_prepare(vq))) {
1327 virtqueue_notify(vq);
1328 PMD_RX_LOG(DEBUG, "Notified");
1336 virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts,
1339 struct virtnet_rx *rxvq = rx_queue;
1340 struct virtqueue *vq = rxvq->vq;
1341 struct virtio_hw *hw = vq->hw;
1342 struct rte_mbuf *rxm;
1343 uint16_t num, nb_rx;
1344 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1345 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1347 uint32_t i, nb_enqueued;
1349 struct virtio_net_hdr *hdr;
1352 if (unlikely(hw->started == 0))
1355 num = RTE_MIN(VIRTIO_MBUF_BURST_SZ, nb_pkts);
1356 if (likely(num > DESC_PER_CACHELINE))
1357 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1359 num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1360 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1363 hdr_size = hw->vtnet_hdr_size;
1365 for (i = 0; i < num; i++) {
1368 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1370 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1371 PMD_RX_LOG(ERR, "Packet drop");
1373 virtio_discard_rxbuf(vq, rxm);
1374 rxvq->stats.errors++;
1378 rxm->port = rxvq->port_id;
1379 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1383 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1384 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1386 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1387 RTE_PKTMBUF_HEADROOM - hdr_size);
1390 rte_vlan_strip(rxm);
1392 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1393 virtio_discard_rxbuf(vq, rxm);
1394 rxvq->stats.errors++;
1398 virtio_rx_stats_updated(rxvq, rxm);
1400 rx_pkts[nb_rx++] = rxm;
1403 rxvq->stats.packets += nb_rx;
1405 /* Allocate new mbuf for the used descriptor */
1406 if (likely(!virtqueue_full(vq))) {
1407 uint16_t free_cnt = vq->vq_free_cnt;
1408 struct rte_mbuf *new_pkts[free_cnt];
1410 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1412 error = virtqueue_enqueue_recv_refill_packed(vq,
1413 new_pkts, free_cnt);
1414 if (unlikely(error)) {
1415 for (i = 0; i < free_cnt; i++)
1416 rte_pktmbuf_free(new_pkts[i]);
1418 nb_enqueued += free_cnt;
1420 struct rte_eth_dev *dev =
1421 &rte_eth_devices[rxvq->port_id];
1422 dev->data->rx_mbuf_alloc_failed += free_cnt;
1426 if (likely(nb_enqueued)) {
1427 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1428 virtqueue_notify(vq);
1429 PMD_RX_LOG(DEBUG, "Notified");
1438 virtio_recv_pkts_inorder(void *rx_queue,
1439 struct rte_mbuf **rx_pkts,
1442 struct virtnet_rx *rxvq = rx_queue;
1443 struct virtqueue *vq = rxvq->vq;
1444 struct virtio_hw *hw = vq->hw;
1445 struct rte_mbuf *rxm;
1446 struct rte_mbuf *prev = NULL;
1447 uint16_t nb_used, num, nb_rx;
1448 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1449 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1451 uint32_t nb_enqueued;
1458 if (unlikely(hw->started == 0))
1461 nb_used = VIRTQUEUE_NUSED(vq);
1462 nb_used = RTE_MIN(nb_used, nb_pkts);
1463 nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1465 virtio_rmb(hw->weak_barriers);
1467 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1472 hdr_size = hw->vtnet_hdr_size;
1474 num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1476 for (i = 0; i < num; i++) {
1477 struct virtio_net_hdr_mrg_rxbuf *header;
1479 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1480 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1484 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1485 PMD_RX_LOG(ERR, "Packet drop");
1487 virtio_discard_rxbuf_inorder(vq, rxm);
1488 rxvq->stats.errors++;
1492 header = (struct virtio_net_hdr_mrg_rxbuf *)
1493 ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1496 if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
1497 seg_num = header->num_buffers;
1504 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1505 rxm->nb_segs = seg_num;
1508 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1509 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1511 rxm->port = rxvq->port_id;
1513 rx_pkts[nb_rx] = rxm;
1516 if (vq->hw->has_rx_offload &&
1517 virtio_rx_offload(rxm, &header->hdr) < 0) {
1518 virtio_discard_rxbuf_inorder(vq, rxm);
1519 rxvq->stats.errors++;
1524 rte_vlan_strip(rx_pkts[nb_rx]);
1526 seg_res = seg_num - 1;
1528 /* Merge remaining segments */
1529 while (seg_res != 0 && i < (num - 1)) {
1533 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1534 rxm->pkt_len = (uint32_t)(len[i]);
1535 rxm->data_len = (uint16_t)(len[i]);
1537 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1545 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1550 /* Last packet still need merge segments */
1551 while (seg_res != 0) {
1552 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1553 VIRTIO_MBUF_BURST_SZ);
1555 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1556 virtio_rmb(hw->weak_barriers);
1557 num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1559 uint16_t extra_idx = 0;
1562 while (extra_idx < rcv_cnt) {
1563 rxm = rcv_pkts[extra_idx];
1565 RTE_PKTMBUF_HEADROOM - hdr_size;
1566 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1567 rxm->data_len = (uint16_t)(len[extra_idx]);
1570 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1576 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1581 "No enough segments for packet.");
1582 rte_pktmbuf_free(rx_pkts[nb_rx]);
1583 rxvq->stats.errors++;
1588 rxvq->stats.packets += nb_rx;
1590 /* Allocate new mbuf for the used descriptor */
1592 if (likely(!virtqueue_full(vq))) {
1593 /* free_cnt may include mrg descs */
1594 uint16_t free_cnt = vq->vq_free_cnt;
1595 struct rte_mbuf *new_pkts[free_cnt];
1597 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1598 error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1600 if (unlikely(error)) {
1601 for (i = 0; i < free_cnt; i++)
1602 rte_pktmbuf_free(new_pkts[i]);
1604 nb_enqueued += free_cnt;
1606 struct rte_eth_dev *dev =
1607 &rte_eth_devices[rxvq->port_id];
1608 dev->data->rx_mbuf_alloc_failed += free_cnt;
1612 if (likely(nb_enqueued)) {
1613 vq_update_avail_idx(vq);
1615 if (unlikely(virtqueue_kick_prepare(vq))) {
1616 virtqueue_notify(vq);
1617 PMD_RX_LOG(DEBUG, "Notified");
1625 virtio_recv_mergeable_pkts(void *rx_queue,
1626 struct rte_mbuf **rx_pkts,
1629 struct virtnet_rx *rxvq = rx_queue;
1630 struct virtqueue *vq = rxvq->vq;
1631 struct virtio_hw *hw = vq->hw;
1632 struct rte_mbuf *rxm;
1633 struct rte_mbuf *prev = NULL;
1634 uint16_t nb_used, num, nb_rx = 0;
1635 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1636 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1638 uint32_t nb_enqueued = 0;
1639 uint32_t seg_num = 0;
1640 uint32_t seg_res = 0;
1641 uint32_t hdr_size = hw->vtnet_hdr_size;
1644 if (unlikely(hw->started == 0))
1647 nb_used = VIRTQUEUE_NUSED(vq);
1649 virtio_rmb(hw->weak_barriers);
1651 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1653 num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1654 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1655 num = VIRTIO_MBUF_BURST_SZ;
1656 if (likely(num > DESC_PER_CACHELINE))
1657 num = num - ((vq->vq_used_cons_idx + num) %
1658 DESC_PER_CACHELINE);
1661 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1663 for (i = 0; i < num; i++) {
1664 struct virtio_net_hdr_mrg_rxbuf *header;
1666 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1667 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1671 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1672 PMD_RX_LOG(ERR, "Packet drop");
1674 virtio_discard_rxbuf(vq, rxm);
1675 rxvq->stats.errors++;
1679 header = (struct virtio_net_hdr_mrg_rxbuf *)
1680 ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1682 seg_num = header->num_buffers;
1686 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1687 rxm->nb_segs = seg_num;
1690 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1691 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1693 rxm->port = rxvq->port_id;
1695 rx_pkts[nb_rx] = rxm;
1698 if (hw->has_rx_offload &&
1699 virtio_rx_offload(rxm, &header->hdr) < 0) {
1700 virtio_discard_rxbuf(vq, rxm);
1701 rxvq->stats.errors++;
1706 rte_vlan_strip(rx_pkts[nb_rx]);
1708 seg_res = seg_num - 1;
1710 /* Merge remaining segments */
1711 while (seg_res != 0 && i < (num - 1)) {
1715 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1716 rxm->pkt_len = (uint32_t)(len[i]);
1717 rxm->data_len = (uint16_t)(len[i]);
1719 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1727 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1732 /* Last packet still need merge segments */
1733 while (seg_res != 0) {
1734 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1735 VIRTIO_MBUF_BURST_SZ);
1737 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1738 virtio_rmb(hw->weak_barriers);
1739 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,
1741 uint16_t extra_idx = 0;
1744 while (extra_idx < rcv_cnt) {
1745 rxm = rcv_pkts[extra_idx];
1747 RTE_PKTMBUF_HEADROOM - hdr_size;
1748 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1749 rxm->data_len = (uint16_t)(len[extra_idx]);
1752 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1758 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1763 "No enough segments for packet.");
1764 rte_pktmbuf_free(rx_pkts[nb_rx]);
1765 rxvq->stats.errors++;
1770 rxvq->stats.packets += nb_rx;
1772 /* Allocate new mbuf for the used descriptor */
1773 if (likely(!virtqueue_full(vq))) {
1774 /* free_cnt may include mrg descs */
1775 uint16_t free_cnt = vq->vq_free_cnt;
1776 struct rte_mbuf *new_pkts[free_cnt];
1778 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1779 error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1781 if (unlikely(error)) {
1782 for (i = 0; i < free_cnt; i++)
1783 rte_pktmbuf_free(new_pkts[i]);
1785 nb_enqueued += free_cnt;
1787 struct rte_eth_dev *dev =
1788 &rte_eth_devices[rxvq->port_id];
1789 dev->data->rx_mbuf_alloc_failed += free_cnt;
1793 if (likely(nb_enqueued)) {
1794 vq_update_avail_idx(vq);
1796 if (unlikely(virtqueue_kick_prepare(vq))) {
1797 virtqueue_notify(vq);
1798 PMD_RX_LOG(DEBUG, "Notified");
1806 virtio_recv_mergeable_pkts_packed(void *rx_queue,
1807 struct rte_mbuf **rx_pkts,
1810 struct virtnet_rx *rxvq = rx_queue;
1811 struct virtqueue *vq = rxvq->vq;
1812 struct virtio_hw *hw = vq->hw;
1813 struct rte_mbuf *rxm;
1814 struct rte_mbuf *prev = NULL;
1815 uint16_t num, nb_rx = 0;
1816 uint32_t len[VIRTIO_MBUF_BURST_SZ];
1817 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1818 uint32_t nb_enqueued = 0;
1819 uint32_t seg_num = 0;
1820 uint32_t seg_res = 0;
1821 uint32_t hdr_size = hw->vtnet_hdr_size;
1825 if (unlikely(hw->started == 0))
1830 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1831 num = VIRTIO_MBUF_BURST_SZ;
1832 if (likely(num > DESC_PER_CACHELINE))
1833 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1835 num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1837 for (i = 0; i < num; i++) {
1838 struct virtio_net_hdr_mrg_rxbuf *header;
1840 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1841 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1845 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1846 PMD_RX_LOG(ERR, "Packet drop");
1848 virtio_discard_rxbuf(vq, rxm);
1849 rxvq->stats.errors++;
1853 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)
1854 rxm->buf_addr + RTE_PKTMBUF_HEADROOM - hdr_size);
1855 seg_num = header->num_buffers;
1860 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1861 rxm->nb_segs = seg_num;
1864 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1865 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1867 rxm->port = rxvq->port_id;
1868 rx_pkts[nb_rx] = rxm;
1871 if (hw->has_rx_offload &&
1872 virtio_rx_offload(rxm, &header->hdr) < 0) {
1873 virtio_discard_rxbuf(vq, rxm);
1874 rxvq->stats.errors++;
1879 rte_vlan_strip(rx_pkts[nb_rx]);
1881 seg_res = seg_num - 1;
1883 /* Merge remaining segments */
1884 while (seg_res != 0 && i < (num - 1)) {
1888 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1889 rxm->pkt_len = (uint32_t)(len[i]);
1890 rxm->data_len = (uint16_t)(len[i]);
1892 rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1900 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1905 /* Last packet still need merge segments */
1906 while (seg_res != 0) {
1907 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1908 VIRTIO_MBUF_BURST_SZ);
1909 uint16_t extra_idx = 0;
1911 rcv_cnt = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
1913 if (unlikely(rcv_cnt == 0)) {
1914 PMD_RX_LOG(ERR, "No enough segments for packet.");
1915 rte_pktmbuf_free(rx_pkts[nb_rx]);
1916 rxvq->stats.errors++;
1920 while (extra_idx < rcv_cnt) {
1921 rxm = rcv_pkts[extra_idx];
1923 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1924 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1925 rxm->data_len = (uint16_t)(len[extra_idx]);
1929 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1934 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1939 rxvq->stats.packets += nb_rx;
1941 /* Allocate new mbuf for the used descriptor */
1942 if (likely(!virtqueue_full(vq))) {
1943 /* free_cnt may include mrg descs */
1944 uint16_t free_cnt = vq->vq_free_cnt;
1945 struct rte_mbuf *new_pkts[free_cnt];
1947 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1948 error = virtqueue_enqueue_recv_refill_packed(vq,
1949 new_pkts, free_cnt);
1950 if (unlikely(error)) {
1951 for (i = 0; i < free_cnt; i++)
1952 rte_pktmbuf_free(new_pkts[i]);
1954 nb_enqueued += free_cnt;
1956 struct rte_eth_dev *dev =
1957 &rte_eth_devices[rxvq->port_id];
1958 dev->data->rx_mbuf_alloc_failed += free_cnt;
1962 if (likely(nb_enqueued)) {
1963 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1964 virtqueue_notify(vq);
1965 PMD_RX_LOG(DEBUG, "Notified");
1973 virtio_xmit_pkts_prepare(void *tx_queue __rte_unused, struct rte_mbuf **tx_pkts,
1979 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1980 struct rte_mbuf *m = tx_pkts[nb_tx];
1982 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
1983 error = rte_validate_tx_offload(m);
1984 if (unlikely(error)) {
1990 /* Do VLAN tag insertion */
1991 if (unlikely(m->ol_flags & PKT_TX_VLAN_PKT)) {
1992 error = rte_vlan_insert(&m);
1993 /* rte_vlan_insert() may change pointer
1994 * even in the case of failure
1998 if (unlikely(error)) {
2004 error = rte_net_intel_cksum_prepare(m);
2005 if (unlikely(error)) {
2010 if (m->ol_flags & PKT_TX_TCP_SEG)
2011 virtio_tso_fix_cksum(m);
2018 virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
2021 struct virtnet_tx *txvq = tx_queue;
2022 struct virtqueue *vq = txvq->vq;
2023 struct virtio_hw *hw = vq->hw;
2024 uint16_t hdr_size = hw->vtnet_hdr_size;
2026 bool in_order = hw->use_inorder_tx;
2028 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2031 if (unlikely(nb_pkts < 1))
2034 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2036 if (nb_pkts > vq->vq_free_cnt)
2037 virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt,
2040 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2041 struct rte_mbuf *txm = tx_pkts[nb_tx];
2042 int can_push = 0, slots, need;
2044 /* optimize ring usage */
2045 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2046 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2047 rte_mbuf_refcnt_read(txm) == 1 &&
2048 RTE_MBUF_DIRECT(txm) &&
2049 txm->nb_segs == 1 &&
2050 rte_pktmbuf_headroom(txm) >= hdr_size &&
2051 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2052 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2055 /* How many main ring entries are needed to this Tx?
2056 * any_layout => number of segments
2057 * default => number of segments + 1
2059 slots = txm->nb_segs + !can_push;
2060 need = slots - vq->vq_free_cnt;
2062 /* Positive value indicates it need free vring descriptors */
2063 if (unlikely(need > 0)) {
2064 virtio_xmit_cleanup_packed(vq, need, in_order);
2065 need = slots - vq->vq_free_cnt;
2066 if (unlikely(need > 0)) {
2068 "No free tx descriptors to transmit");
2073 /* Enqueue Packet buffers */
2075 virtqueue_enqueue_xmit_packed_fast(txvq, txm, in_order);
2077 virtqueue_enqueue_xmit_packed(txvq, txm, slots, 0,
2080 virtio_update_packet_stats(&txvq->stats, txm);
2083 txvq->stats.packets += nb_tx;
2085 if (likely(nb_tx)) {
2086 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
2087 virtqueue_notify(vq);
2088 PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2096 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
2098 struct virtnet_tx *txvq = tx_queue;
2099 struct virtqueue *vq = txvq->vq;
2100 struct virtio_hw *hw = vq->hw;
2101 uint16_t hdr_size = hw->vtnet_hdr_size;
2102 uint16_t nb_used, nb_tx = 0;
2104 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2107 if (unlikely(nb_pkts < 1))
2110 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2111 nb_used = VIRTQUEUE_NUSED(vq);
2113 virtio_rmb(hw->weak_barriers);
2114 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2115 virtio_xmit_cleanup(vq, nb_used);
2117 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2118 struct rte_mbuf *txm = tx_pkts[nb_tx];
2119 int can_push = 0, use_indirect = 0, slots, need;
2121 /* optimize ring usage */
2122 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2123 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2124 rte_mbuf_refcnt_read(txm) == 1 &&
2125 RTE_MBUF_DIRECT(txm) &&
2126 txm->nb_segs == 1 &&
2127 rte_pktmbuf_headroom(txm) >= hdr_size &&
2128 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2129 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2131 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
2132 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
2135 /* How many main ring entries are needed to this Tx?
2136 * any_layout => number of segments
2138 * default => number of segments + 1
2140 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
2141 need = slots - vq->vq_free_cnt;
2143 /* Positive value indicates it need free vring descriptors */
2144 if (unlikely(need > 0)) {
2145 nb_used = VIRTQUEUE_NUSED(vq);
2146 virtio_rmb(hw->weak_barriers);
2147 need = RTE_MIN(need, (int)nb_used);
2149 virtio_xmit_cleanup(vq, need);
2150 need = slots - vq->vq_free_cnt;
2151 if (unlikely(need > 0)) {
2153 "No free tx descriptors to transmit");
2158 /* Enqueue Packet buffers */
2159 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
2162 virtio_update_packet_stats(&txvq->stats, txm);
2165 txvq->stats.packets += nb_tx;
2167 if (likely(nb_tx)) {
2168 vq_update_avail_idx(vq);
2170 if (unlikely(virtqueue_kick_prepare(vq))) {
2171 virtqueue_notify(vq);
2172 PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2179 static __rte_always_inline int
2180 virtio_xmit_try_cleanup_inorder(struct virtqueue *vq, uint16_t need)
2182 uint16_t nb_used, nb_clean, nb_descs;
2183 struct virtio_hw *hw = vq->hw;
2185 nb_descs = vq->vq_free_cnt + need;
2186 nb_used = VIRTQUEUE_NUSED(vq);
2187 virtio_rmb(hw->weak_barriers);
2188 nb_clean = RTE_MIN(need, (int)nb_used);
2190 virtio_xmit_cleanup_inorder(vq, nb_clean);
2192 return nb_descs - vq->vq_free_cnt;
2196 virtio_xmit_pkts_inorder(void *tx_queue,
2197 struct rte_mbuf **tx_pkts,
2200 struct virtnet_tx *txvq = tx_queue;
2201 struct virtqueue *vq = txvq->vq;
2202 struct virtio_hw *hw = vq->hw;
2203 uint16_t hdr_size = hw->vtnet_hdr_size;
2204 uint16_t nb_used, nb_tx = 0, nb_inorder_pkts = 0;
2205 struct rte_mbuf *inorder_pkts[nb_pkts];
2208 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2211 if (unlikely(nb_pkts < 1))
2215 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2216 nb_used = VIRTQUEUE_NUSED(vq);
2218 virtio_rmb(hw->weak_barriers);
2219 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2220 virtio_xmit_cleanup_inorder(vq, nb_used);
2222 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2223 struct rte_mbuf *txm = tx_pkts[nb_tx];
2226 /* optimize ring usage */
2227 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2228 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2229 rte_mbuf_refcnt_read(txm) == 1 &&
2230 RTE_MBUF_DIRECT(txm) &&
2231 txm->nb_segs == 1 &&
2232 rte_pktmbuf_headroom(txm) >= hdr_size &&
2233 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2234 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
2235 inorder_pkts[nb_inorder_pkts] = txm;
2241 if (nb_inorder_pkts) {
2242 need = nb_inorder_pkts - vq->vq_free_cnt;
2243 if (unlikely(need > 0)) {
2244 need = virtio_xmit_try_cleanup_inorder(vq,
2246 if (unlikely(need > 0)) {
2248 "No free tx descriptors to "
2253 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2255 nb_inorder_pkts = 0;
2258 slots = txm->nb_segs + 1;
2259 need = slots - vq->vq_free_cnt;
2260 if (unlikely(need > 0)) {
2261 need = virtio_xmit_try_cleanup_inorder(vq, slots);
2263 if (unlikely(need > 0)) {
2265 "No free tx descriptors to transmit");
2269 /* Enqueue Packet buffers */
2270 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
2272 virtio_update_packet_stats(&txvq->stats, txm);
2275 /* Transmit all inorder packets */
2276 if (nb_inorder_pkts) {
2277 need = nb_inorder_pkts - vq->vq_free_cnt;
2278 if (unlikely(need > 0)) {
2279 need = virtio_xmit_try_cleanup_inorder(vq,
2281 if (unlikely(need > 0)) {
2283 "No free tx descriptors to transmit");
2284 nb_inorder_pkts = vq->vq_free_cnt;
2289 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2293 txvq->stats.packets += nb_tx;
2295 if (likely(nb_tx)) {
2296 vq_update_avail_idx(vq);
2298 if (unlikely(virtqueue_kick_prepare(vq))) {
2299 virtqueue_notify(vq);
2300 PMD_TX_LOG(DEBUG, "Notified backend after xmit");