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, VIRTIO_PCI_VRING_ALIGN);
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)
328 struct virtio_hw *hw = dev->data->dev_private;
331 virtio_dev_vring_start(hw->cvq, VTNET_CQ);
332 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq);
337 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
340 * Start receive and transmit vrings
341 * - Setup vring structure for all queues
342 * - Initialize descriptor for the rx vring
343 * - Allocate blank mbufs for the each rx descriptor
348 PMD_INIT_FUNC_TRACE();
350 /* Start rx vring. */
351 for (i = 0; i < dev->data->nb_rx_queues; i++) {
352 virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ);
353 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
356 /* Start tx vring. */
357 for (i = 0; i < dev->data->nb_tx_queues; i++) {
358 virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ);
359 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
364 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
367 unsigned int socket_id,
368 __rte_unused const struct rte_eth_rxconf *rx_conf,
369 struct rte_mempool *mp)
371 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
372 struct virtqueue *vq;
375 PMD_INIT_FUNC_TRACE();
376 ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
377 nb_desc, socket_id, &vq);
379 PMD_INIT_LOG(ERR, "tvq initialization failed");
383 /* Create mempool for rx mbuf allocation */
386 dev->data->rx_queues[queue_idx] = vq;
391 * struct rte_eth_dev *dev: Used to update dev
392 * uint16_t nb_desc: Defaults to values read from config space
393 * unsigned int socket_id: Used to allocate memzone
394 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
395 * uint16_t queue_idx: Just used as an index in dev txq list
398 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
401 unsigned int socket_id,
402 const struct rte_eth_txconf *tx_conf)
404 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
405 struct virtqueue *vq;
408 PMD_INIT_FUNC_TRACE();
410 if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOOFFLOADS)
411 != ETH_TXQ_FLAGS_NOOFFLOADS) {
412 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
416 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
417 nb_desc, socket_id, &vq);
419 PMD_INIT_LOG(ERR, "rvq initialization failed");
423 dev->data->tx_queues[queue_idx] = vq;
428 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
432 * Requeue the discarded mbuf. This should always be
433 * successful since it was just dequeued.
435 error = virtqueue_enqueue_recv_refill(vq, m);
436 if (unlikely(error)) {
437 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
442 #define VIRTIO_MBUF_BURST_SZ 64
443 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
445 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
447 struct virtqueue *rxvq = rx_queue;
448 struct rte_mbuf *rxm, *new_mbuf;
449 uint16_t nb_used, num, nb_rx = 0;
450 uint32_t len[VIRTIO_MBUF_BURST_SZ];
451 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
453 uint32_t i, nb_enqueued = 0;
454 const uint32_t hdr_size = sizeof(struct virtio_net_hdr);
456 nb_used = VIRTQUEUE_NUSED(rxvq);
460 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
461 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
462 if (likely(num > DESC_PER_CACHELINE))
463 num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
468 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num);
469 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
470 for (i = 0; i < num ; i++) {
473 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
475 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
476 PMD_RX_LOG(ERR, "Packet drop");
478 virtio_discard_rxbuf(rxvq, rxm);
483 rxm->port = rxvq->port_id;
484 rxm->data_off = RTE_PKTMBUF_HEADROOM;
488 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
489 rxm->data_len = (uint16_t)(len[i] - hdr_size);
491 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
493 rx_pkts[nb_rx++] = rxm;
494 rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len;
497 rxvq->packets += nb_rx;
499 /* Allocate new mbuf for the used descriptor */
501 while (likely(!virtqueue_full(rxvq))) {
502 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
503 if (unlikely(new_mbuf == NULL)) {
504 struct rte_eth_dev *dev
505 = &rte_eth_devices[rxvq->port_id];
506 dev->data->rx_mbuf_alloc_failed++;
509 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
510 if (unlikely(error)) {
511 rte_pktmbuf_free(new_mbuf);
517 if (likely(nb_enqueued)) {
518 vq_update_avail_idx(rxvq);
520 if (unlikely(virtqueue_kick_prepare(rxvq))) {
521 virtqueue_notify(rxvq);
522 PMD_RX_LOG(DEBUG, "Notified\n");
530 virtio_recv_mergeable_pkts(void *rx_queue,
531 struct rte_mbuf **rx_pkts,
534 struct virtqueue *rxvq = rx_queue;
535 struct rte_mbuf *rxm, *new_mbuf;
536 uint16_t nb_used, num, nb_rx = 0;
537 uint32_t len[VIRTIO_MBUF_BURST_SZ];
538 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
539 struct rte_mbuf *prev;
541 uint32_t i = 0, nb_enqueued = 0;
542 uint32_t seg_num = 0;
543 uint16_t extra_idx = 0;
544 uint32_t seg_res = 0;
545 const uint32_t hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
547 nb_used = VIRTQUEUE_NUSED(rxvq);
554 PMD_RX_LOG(DEBUG, "used:%d\n", nb_used);
556 while (i < nb_used) {
557 struct virtio_net_hdr_mrg_rxbuf *header;
559 if (nb_rx == nb_pkts)
562 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1);
568 PMD_RX_LOG(DEBUG, "dequeue:%d\n", num);
569 PMD_RX_LOG(DEBUG, "packet len:%d\n", len[0]);
573 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
574 PMD_RX_LOG(ERR, "Packet drop\n");
576 virtio_discard_rxbuf(rxvq, rxm);
581 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
582 RTE_PKTMBUF_HEADROOM - hdr_size);
583 seg_num = header->num_buffers;
588 rxm->data_off = RTE_PKTMBUF_HEADROOM;
589 rxm->nb_segs = seg_num;
591 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
592 rxm->data_len = (uint16_t)(len[0] - hdr_size);
594 rxm->port = rxvq->port_id;
595 rx_pkts[nb_rx] = rxm;
598 seg_res = seg_num - 1;
600 while (seg_res != 0) {
602 * Get extra segments for current uncompleted packet.
605 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
606 if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) {
608 virtqueue_dequeue_burst_rx(rxvq,
609 rcv_pkts, len, rcv_cnt);
614 "No enough segments for packet.\n");
616 virtio_discard_rxbuf(rxvq, rxm);
623 while (extra_idx < rcv_cnt) {
624 rxm = rcv_pkts[extra_idx];
626 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
628 rxm->pkt_len = (uint32_t)(len[extra_idx]);
629 rxm->data_len = (uint16_t)(len[extra_idx]);
635 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
641 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
642 rx_pkts[nb_rx]->data_len);
644 rxvq->bytes += rx_pkts[nb_rx]->pkt_len;
648 rxvq->packets += nb_rx;
650 /* Allocate new mbuf for the used descriptor */
652 while (likely(!virtqueue_full(rxvq))) {
653 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
654 if (unlikely(new_mbuf == NULL)) {
655 struct rte_eth_dev *dev
656 = &rte_eth_devices[rxvq->port_id];
657 dev->data->rx_mbuf_alloc_failed++;
660 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
661 if (unlikely(error)) {
662 rte_pktmbuf_free(new_mbuf);
668 if (likely(nb_enqueued)) {
669 vq_update_avail_idx(rxvq);
671 if (unlikely(virtqueue_kick_prepare(rxvq))) {
672 virtqueue_notify(rxvq);
673 PMD_RX_LOG(DEBUG, "Notified");
681 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
683 struct virtqueue *txvq = tx_queue;
684 struct rte_mbuf *txm;
685 uint16_t nb_used, nb_tx, num;
690 if (unlikely(nb_pkts < 1))
693 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
694 nb_used = VIRTQUEUE_NUSED(txvq);
698 num = (uint16_t)(likely(nb_used < VIRTIO_MBUF_BURST_SZ) ? nb_used : VIRTIO_MBUF_BURST_SZ);
700 while (nb_tx < nb_pkts) {
701 /* Need one more descriptor for virtio header. */
702 int need = tx_pkts[nb_tx]->nb_segs - txvq->vq_free_cnt + 1;
703 int deq_cnt = RTE_MIN(need, (int)num);
705 num -= (deq_cnt > 0) ? deq_cnt : 0;
706 while (deq_cnt > 0) {
707 virtqueue_dequeue_pkt_tx(txvq);
711 need = (int)tx_pkts[nb_tx]->nb_segs - txvq->vq_free_cnt + 1;
713 * Zero or negative value indicates it has enough free
714 * descriptors to use for transmitting.
716 if (likely(need <= 0)) {
717 txm = tx_pkts[nb_tx];
718 /* Enqueue Packet buffers */
719 error = virtqueue_enqueue_xmit(txvq, txm);
720 if (unlikely(error)) {
722 PMD_TX_LOG(ERR, "virtqueue_enqueue Free count = 0");
723 else if (error == EMSGSIZE)
724 PMD_TX_LOG(ERR, "virtqueue_enqueue Free count < 1");
726 PMD_TX_LOG(ERR, "virtqueue_enqueue error: %d", error);
730 txvq->bytes += txm->pkt_len;
732 PMD_TX_LOG(ERR, "No free tx descriptors to transmit");
737 txvq->packets += nb_tx;
740 vq_update_avail_idx(txvq);
742 if (unlikely(virtqueue_kick_prepare(txvq))) {
743 virtqueue_notify(txvq);
744 PMD_TX_LOG(DEBUG, "Notified backend after xmit");