4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 #include <rte_cycles.h>
41 #include <rte_memory.h>
42 #include <rte_memzone.h>
43 #include <rte_branch_prediction.h>
44 #include <rte_mempool.h>
45 #include <rte_malloc.h>
47 #include <rte_ether.h>
48 #include <rte_ethdev.h>
49 #include <rte_prefetch.h>
50 #include <rte_string_fns.h>
51 #include <rte_errno.h>
53 #include "virtio_logs.h"
54 #include "virtio_ethdev.h"
55 #include "virtqueue.h"
57 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
58 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
60 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
64 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
66 struct vring_desc *dp, *dp_tail;
67 struct vq_desc_extra *dxp;
68 uint16_t desc_idx_last = desc_idx;
70 dp = &vq->vq_ring.desc[desc_idx];
71 dxp = &vq->vq_descx[desc_idx];
72 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
73 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
74 while (dp->flags & VRING_DESC_F_NEXT) {
75 desc_idx_last = dp->next;
76 dp = &vq->vq_ring.desc[dp->next];
82 * We must append the existing free chain, if any, to the end of
83 * newly freed chain. If the virtqueue was completely used, then
84 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
86 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
87 vq->vq_desc_head_idx = desc_idx;
89 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
90 dp_tail->next = desc_idx;
93 vq->vq_desc_tail_idx = desc_idx_last;
94 dp->next = VQ_RING_DESC_CHAIN_END;
98 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
99 uint32_t *len, uint16_t num)
101 struct vring_used_elem *uep;
102 struct rte_mbuf *cookie;
103 uint16_t used_idx, desc_idx;
106 /* Caller does the check */
107 for (i = 0; i < num ; i++) {
108 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
109 uep = &vq->vq_ring.used->ring[used_idx];
110 desc_idx = (uint16_t) uep->id;
112 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
114 if (unlikely(cookie == NULL)) {
115 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
116 vq->vq_used_cons_idx);
120 rte_prefetch0(cookie);
121 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
123 vq->vq_used_cons_idx++;
124 vq_ring_free_chain(vq, desc_idx);
125 vq->vq_descx[desc_idx].cookie = NULL;
132 virtqueue_dequeue_pkt_tx(struct virtqueue *vq)
134 struct vring_used_elem *uep;
135 uint16_t used_idx, desc_idx;
137 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
138 uep = &vq->vq_ring.used->ring[used_idx];
139 desc_idx = (uint16_t) uep->id;
140 vq->vq_used_cons_idx++;
141 vq_ring_free_chain(vq, desc_idx);
146 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
148 struct vq_desc_extra *dxp;
149 struct virtio_hw *hw = vq->hw;
150 struct vring_desc *start_dp;
152 uint16_t head_idx, idx;
154 if (unlikely(vq->vq_free_cnt == 0))
156 if (unlikely(vq->vq_free_cnt < needed))
159 head_idx = vq->vq_desc_head_idx;
160 if (unlikely(head_idx >= vq->vq_nentries))
164 dxp = &vq->vq_descx[idx];
165 dxp->cookie = (void *)cookie;
166 dxp->ndescs = needed;
168 start_dp = vq->vq_ring.desc;
170 (uint64_t)(cookie->buf_physaddr + RTE_PKTMBUF_HEADROOM
171 - hw->vtnet_hdr_size);
173 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
174 start_dp[idx].flags = VRING_DESC_F_WRITE;
175 idx = start_dp[idx].next;
176 vq->vq_desc_head_idx = idx;
177 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
178 vq->vq_desc_tail_idx = idx;
179 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
180 vq_update_avail_ring(vq, head_idx);
186 virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie)
188 struct vq_desc_extra *dxp;
189 struct vring_desc *start_dp;
190 uint16_t seg_num = cookie->nb_segs;
191 uint16_t needed = 1 + seg_num;
192 uint16_t head_idx, idx;
193 uint16_t head_size = txvq->hw->vtnet_hdr_size;
195 if (unlikely(txvq->vq_free_cnt == 0))
197 if (unlikely(txvq->vq_free_cnt < needed))
199 head_idx = txvq->vq_desc_head_idx;
200 if (unlikely(head_idx >= txvq->vq_nentries))
204 dxp = &txvq->vq_descx[idx];
205 if (dxp->cookie != NULL)
206 rte_pktmbuf_free(dxp->cookie);
207 dxp->cookie = (void *)cookie;
208 dxp->ndescs = needed;
210 start_dp = txvq->vq_ring.desc;
212 txvq->virtio_net_hdr_mem + idx * head_size;
213 start_dp[idx].len = (uint32_t)head_size;
214 start_dp[idx].flags = VRING_DESC_F_NEXT;
216 for (; ((seg_num > 0) && (cookie != NULL)); seg_num--) {
217 idx = start_dp[idx].next;
218 start_dp[idx].addr = RTE_MBUF_DATA_DMA_ADDR(cookie);
219 start_dp[idx].len = cookie->data_len;
220 start_dp[idx].flags = VRING_DESC_F_NEXT;
221 cookie = cookie->next;
224 start_dp[idx].flags &= ~VRING_DESC_F_NEXT;
225 idx = start_dp[idx].next;
226 txvq->vq_desc_head_idx = idx;
227 if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
228 txvq->vq_desc_tail_idx = idx;
229 txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed);
230 vq_update_avail_ring(txvq, head_idx);
235 static inline struct rte_mbuf *
236 rte_rxmbuf_alloc(struct rte_mempool *mp)
240 m = __rte_mbuf_raw_alloc(mp);
241 __rte_mbuf_sanity_check_raw(m, 0);
247 virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
250 int i, nbufs, error, size = vq->vq_nentries;
251 struct vring *vr = &vq->vq_ring;
252 uint8_t *ring_mem = vq->vq_ring_virt_mem;
254 PMD_INIT_FUNC_TRACE();
257 * Reinitialise since virtio port might have been stopped and restarted
259 memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
260 vring_init(vr, size, ring_mem, vq->vq_alignment);
261 vq->vq_used_cons_idx = 0;
262 vq->vq_desc_head_idx = 0;
263 vq->vq_avail_idx = 0;
264 vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
265 vq->vq_free_cnt = vq->vq_nentries;
266 memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
268 /* Chain all the descriptors in the ring with an END */
269 for (i = 0; i < size - 1; i++)
270 vr->desc[i].next = (uint16_t)(i + 1);
271 vr->desc[i].next = VQ_RING_DESC_CHAIN_END;
274 * Disable device(host) interrupting guest
276 virtqueue_disable_intr(vq);
278 /* Only rx virtqueue needs mbufs to be allocated at initialization */
279 if (queue_type == VTNET_RQ) {
280 if (vq->mpool == NULL)
281 rte_exit(EXIT_FAILURE,
282 "Cannot allocate initial mbufs for rx virtqueue");
284 /* Allocate blank mbufs for the each rx descriptor */
287 while (!virtqueue_full(vq)) {
288 m = rte_rxmbuf_alloc(vq->mpool);
292 /******************************************
293 * Enqueue allocated buffers *
294 *******************************************/
295 error = virtqueue_enqueue_recv_refill(vq, m);
304 vq_update_avail_idx(vq);
306 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
308 VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_SEL,
310 VIRTIO_WRITE_REG_4(vq->hw, VIRTIO_PCI_QUEUE_PFN,
311 vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
312 } else if (queue_type == VTNET_TQ) {
313 VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_SEL,
315 VIRTIO_WRITE_REG_4(vq->hw, VIRTIO_PCI_QUEUE_PFN,
316 vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
318 VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_SEL,
320 VIRTIO_WRITE_REG_4(vq->hw, VIRTIO_PCI_QUEUE_PFN,
321 vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
326 virtio_dev_cq_start(struct rte_eth_dev *dev)
329 = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
332 virtio_dev_vring_start(hw->cvq, VTNET_CQ);
333 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq);
338 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
341 * Start receive and transmit vrings
342 * - Setup vring structure for all queues
343 * - Initialize descriptor for the rx vring
344 * - Allocate blank mbufs for the each rx descriptor
349 PMD_INIT_FUNC_TRACE();
351 /* Start rx vring. */
352 for (i = 0; i < dev->data->nb_rx_queues; i++) {
353 virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ);
354 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
357 /* Start tx vring. */
358 for (i = 0; i < dev->data->nb_tx_queues; i++) {
359 virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ);
360 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
365 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
368 unsigned int socket_id,
369 __rte_unused const struct rte_eth_rxconf *rx_conf,
370 struct rte_mempool *mp)
372 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
373 struct virtqueue *vq;
376 PMD_INIT_FUNC_TRACE();
377 ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
378 nb_desc, socket_id, &vq);
380 PMD_INIT_LOG(ERR, "tvq initialization failed");
384 /* Create mempool for rx mbuf allocation */
387 dev->data->rx_queues[queue_idx] = vq;
392 * struct rte_eth_dev *dev: Used to update dev
393 * uint16_t nb_desc: Defaults to values read from config space
394 * unsigned int socket_id: Used to allocate memzone
395 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
396 * uint16_t queue_idx: Just used as an index in dev txq list
399 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
402 unsigned int socket_id,
403 const struct rte_eth_txconf *tx_conf)
405 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
406 struct virtqueue *vq;
409 PMD_INIT_FUNC_TRACE();
411 if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOOFFLOADS)
412 != ETH_TXQ_FLAGS_NOOFFLOADS) {
413 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
417 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
418 nb_desc, socket_id, &vq);
420 PMD_INIT_LOG(ERR, "rvq initialization failed");
424 dev->data->tx_queues[queue_idx] = vq;
429 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
433 * Requeue the discarded mbuf. This should always be
434 * successful since it was just dequeued.
436 error = virtqueue_enqueue_recv_refill(vq, m);
437 if (unlikely(error)) {
438 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
443 #define VIRTIO_MBUF_BURST_SZ 64
444 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
446 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
448 struct virtqueue *rxvq = rx_queue;
449 struct rte_mbuf *rxm, *new_mbuf;
450 uint16_t nb_used, num, nb_rx = 0;
451 uint32_t len[VIRTIO_MBUF_BURST_SZ];
452 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
454 uint32_t i, nb_enqueued = 0;
455 const uint32_t hdr_size = sizeof(struct virtio_net_hdr);
457 nb_used = VIRTQUEUE_NUSED(rxvq);
461 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
462 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
463 if (likely(num > DESC_PER_CACHELINE))
464 num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
469 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num);
470 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
471 for (i = 0; i < num ; i++) {
474 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
476 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
477 PMD_RX_LOG(ERR, "Packet drop");
479 virtio_discard_rxbuf(rxvq, rxm);
484 rxm->port = rxvq->port_id;
485 rxm->data_off = RTE_PKTMBUF_HEADROOM;
489 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
490 rxm->data_len = (uint16_t)(len[i] - hdr_size);
492 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
494 rx_pkts[nb_rx++] = rxm;
495 rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len;
498 rxvq->packets += nb_rx;
500 /* Allocate new mbuf for the used descriptor */
502 while (likely(!virtqueue_full(rxvq))) {
503 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
504 if (unlikely(new_mbuf == NULL)) {
505 struct rte_eth_dev *dev
506 = &rte_eth_devices[rxvq->port_id];
507 dev->data->rx_mbuf_alloc_failed++;
510 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
511 if (unlikely(error)) {
512 rte_pktmbuf_free(new_mbuf);
518 if (likely(nb_enqueued)) {
519 if (unlikely(virtqueue_kick_prepare(rxvq))) {
520 virtqueue_notify(rxvq);
521 PMD_RX_LOG(DEBUG, "Notified\n");
525 vq_update_avail_idx(rxvq);
531 virtio_recv_mergeable_pkts(void *rx_queue,
532 struct rte_mbuf **rx_pkts,
535 struct virtqueue *rxvq = rx_queue;
536 struct rte_mbuf *rxm, *new_mbuf;
537 uint16_t nb_used, num, nb_rx = 0;
538 uint32_t len[VIRTIO_MBUF_BURST_SZ];
539 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
540 struct rte_mbuf *prev;
542 uint32_t i = 0, nb_enqueued = 0;
543 uint32_t seg_num = 0;
544 uint16_t extra_idx = 0;
545 uint32_t seg_res = 0;
546 const uint32_t hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
548 nb_used = VIRTQUEUE_NUSED(rxvq);
555 PMD_RX_LOG(DEBUG, "used:%d\n", nb_used);
557 while (i < nb_used) {
558 struct virtio_net_hdr_mrg_rxbuf *header;
560 if (nb_rx == nb_pkts)
563 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1);
569 PMD_RX_LOG(DEBUG, "dequeue:%d\n", num);
570 PMD_RX_LOG(DEBUG, "packet len:%d\n", len[0]);
574 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
575 PMD_RX_LOG(ERR, "Packet drop\n");
577 virtio_discard_rxbuf(rxvq, rxm);
582 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
583 RTE_PKTMBUF_HEADROOM - hdr_size);
584 seg_num = header->num_buffers;
589 rxm->data_off = RTE_PKTMBUF_HEADROOM;
590 rxm->nb_segs = seg_num;
592 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
593 rxm->data_len = (uint16_t)(len[0] - hdr_size);
595 rxm->port = rxvq->port_id;
596 rx_pkts[nb_rx] = rxm;
599 seg_res = seg_num - 1;
601 while (seg_res != 0) {
603 * Get extra segments for current uncompleted packet.
606 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
607 if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) {
609 virtqueue_dequeue_burst_rx(rxvq,
610 rcv_pkts, len, rcv_cnt);
615 "No enough segments for packet.\n");
617 virtio_discard_rxbuf(rxvq, rxm);
624 while (extra_idx < rcv_cnt) {
625 rxm = rcv_pkts[extra_idx];
627 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
629 rxm->pkt_len = (uint32_t)(len[extra_idx]);
630 rxm->data_len = (uint16_t)(len[extra_idx]);
636 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
642 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
643 rx_pkts[nb_rx]->data_len);
645 rxvq->bytes += rx_pkts[nb_rx]->pkt_len;
649 rxvq->packets += nb_rx;
651 /* Allocate new mbuf for the used descriptor */
653 while (likely(!virtqueue_full(rxvq))) {
654 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
655 if (unlikely(new_mbuf == NULL)) {
656 struct rte_eth_dev *dev
657 = &rte_eth_devices[rxvq->port_id];
658 dev->data->rx_mbuf_alloc_failed++;
661 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
662 if (unlikely(error)) {
663 rte_pktmbuf_free(new_mbuf);
669 if (likely(nb_enqueued)) {
670 if (unlikely(virtqueue_kick_prepare(rxvq))) {
671 virtqueue_notify(rxvq);
672 PMD_RX_LOG(DEBUG, "Notified");
676 vq_update_avail_idx(rxvq);
682 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
684 struct virtqueue *txvq = tx_queue;
685 struct rte_mbuf *txm;
686 uint16_t nb_used, nb_tx, num;
691 if (unlikely(nb_pkts < 1))
694 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
695 nb_used = VIRTQUEUE_NUSED(txvq);
699 num = (uint16_t)(likely(nb_used < VIRTIO_MBUF_BURST_SZ) ? nb_used : VIRTIO_MBUF_BURST_SZ);
701 while (nb_tx < nb_pkts) {
702 /* Need one more descriptor for virtio header. */
703 int need = tx_pkts[nb_tx]->nb_segs - txvq->vq_free_cnt + 1;
704 int deq_cnt = RTE_MIN(need, (int)num);
706 num -= (deq_cnt > 0) ? deq_cnt : 0;
707 while (deq_cnt > 0) {
708 virtqueue_dequeue_pkt_tx(txvq);
712 need = (int)tx_pkts[nb_tx]->nb_segs - txvq->vq_free_cnt + 1;
714 * Zero or negative value indicates it has enough free
715 * descriptors to use for transmitting.
717 if (likely(need <= 0)) {
718 txm = tx_pkts[nb_tx];
719 /* Enqueue Packet buffers */
720 error = virtqueue_enqueue_xmit(txvq, txm);
721 if (unlikely(error)) {
723 PMD_TX_LOG(ERR, "virtqueue_enqueue Free count = 0");
724 else if (error == EMSGSIZE)
725 PMD_TX_LOG(ERR, "virtqueue_enqueue Free count < 1");
727 PMD_TX_LOG(ERR, "virtqueue_enqueue error: %d", error);
731 txvq->bytes += txm->pkt_len;
733 PMD_TX_LOG(ERR, "No free tx descriptors to transmit");
737 vq_update_avail_idx(txvq);
739 txvq->packets += nb_tx;
741 if (unlikely(virtqueue_kick_prepare(txvq))) {
742 virtqueue_notify(txvq);
743 PMD_TX_LOG(DEBUG, "Notified backend after xmit");