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,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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>
52 #include <rte_byteorder.h>
54 #include "virtio_logs.h"
55 #include "virtio_ethdev.h"
56 #include "virtio_pci.h"
57 #include "virtqueue.h"
58 #include "virtio_rxtx.h"
60 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
61 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
63 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
67 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
68 ETH_TXQ_FLAGS_NOOFFLOADS)
70 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
71 static int use_simple_rxtx;
75 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
77 struct vring_desc *dp, *dp_tail;
78 struct vq_desc_extra *dxp;
79 uint16_t desc_idx_last = desc_idx;
81 dp = &vq->vq_ring.desc[desc_idx];
82 dxp = &vq->vq_descx[desc_idx];
83 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
84 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
85 while (dp->flags & VRING_DESC_F_NEXT) {
86 desc_idx_last = dp->next;
87 dp = &vq->vq_ring.desc[dp->next];
93 * We must append the existing free chain, if any, to the end of
94 * newly freed chain. If the virtqueue was completely used, then
95 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
97 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
98 vq->vq_desc_head_idx = desc_idx;
100 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
101 dp_tail->next = desc_idx;
104 vq->vq_desc_tail_idx = desc_idx_last;
105 dp->next = VQ_RING_DESC_CHAIN_END;
109 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
110 uint32_t *len, uint16_t num)
112 struct vring_used_elem *uep;
113 struct rte_mbuf *cookie;
114 uint16_t used_idx, desc_idx;
117 /* Caller does the check */
118 for (i = 0; i < num ; i++) {
119 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
120 uep = &vq->vq_ring.used->ring[used_idx];
121 desc_idx = (uint16_t) uep->id;
123 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
125 if (unlikely(cookie == NULL)) {
126 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
127 vq->vq_used_cons_idx);
131 rte_prefetch0(cookie);
132 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
134 vq->vq_used_cons_idx++;
135 vq_ring_free_chain(vq, desc_idx);
136 vq->vq_descx[desc_idx].cookie = NULL;
142 #ifndef DEFAULT_TX_FREE_THRESH
143 #define DEFAULT_TX_FREE_THRESH 32
146 /* Cleanup from completed transmits. */
148 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
150 uint16_t i, used_idx, desc_idx;
151 for (i = 0; i < num; i++) {
152 struct vring_used_elem *uep;
153 struct vq_desc_extra *dxp;
155 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
156 uep = &vq->vq_ring.used->ring[used_idx];
158 desc_idx = (uint16_t) uep->id;
159 dxp = &vq->vq_descx[desc_idx];
160 vq->vq_used_cons_idx++;
161 vq_ring_free_chain(vq, desc_idx);
163 if (dxp->cookie != NULL) {
164 rte_pktmbuf_free(dxp->cookie);
172 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
174 struct vq_desc_extra *dxp;
175 struct virtio_hw *hw = vq->hw;
176 struct vring_desc *start_dp;
178 uint16_t head_idx, idx;
180 if (unlikely(vq->vq_free_cnt == 0))
182 if (unlikely(vq->vq_free_cnt < needed))
185 head_idx = vq->vq_desc_head_idx;
186 if (unlikely(head_idx >= vq->vq_nentries))
190 dxp = &vq->vq_descx[idx];
191 dxp->cookie = (void *)cookie;
192 dxp->ndescs = needed;
194 start_dp = vq->vq_ring.desc;
196 (uint64_t)(cookie->buf_physaddr + RTE_PKTMBUF_HEADROOM
197 - hw->vtnet_hdr_size);
199 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
200 start_dp[idx].flags = VRING_DESC_F_WRITE;
201 idx = start_dp[idx].next;
202 vq->vq_desc_head_idx = idx;
203 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
204 vq->vq_desc_tail_idx = idx;
205 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
206 vq_update_avail_ring(vq, head_idx);
212 virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie)
214 struct vq_desc_extra *dxp;
215 struct vring_desc *start_dp;
216 uint16_t seg_num = cookie->nb_segs;
217 uint16_t needed = 1 + seg_num;
218 uint16_t head_idx, idx;
219 size_t head_size = txvq->hw->vtnet_hdr_size;
221 if (unlikely(txvq->vq_free_cnt == 0))
223 if (unlikely(txvq->vq_free_cnt < needed))
225 head_idx = txvq->vq_desc_head_idx;
226 if (unlikely(head_idx >= txvq->vq_nentries))
230 dxp = &txvq->vq_descx[idx];
231 dxp->cookie = (void *)cookie;
232 dxp->ndescs = needed;
234 start_dp = txvq->vq_ring.desc;
236 txvq->virtio_net_hdr_mem + idx * head_size;
237 start_dp[idx].len = head_size;
238 start_dp[idx].flags = VRING_DESC_F_NEXT;
240 for (; ((seg_num > 0) && (cookie != NULL)); seg_num--) {
241 idx = start_dp[idx].next;
242 start_dp[idx].addr = RTE_MBUF_DATA_DMA_ADDR(cookie);
243 start_dp[idx].len = cookie->data_len;
244 start_dp[idx].flags = VRING_DESC_F_NEXT;
245 cookie = cookie->next;
248 start_dp[idx].flags &= ~VRING_DESC_F_NEXT;
249 idx = start_dp[idx].next;
250 txvq->vq_desc_head_idx = idx;
251 if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
252 txvq->vq_desc_tail_idx = idx;
253 txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed);
254 vq_update_avail_ring(txvq, head_idx);
259 static inline struct rte_mbuf *
260 rte_rxmbuf_alloc(struct rte_mempool *mp)
264 m = __rte_mbuf_raw_alloc(mp);
265 __rte_mbuf_sanity_check_raw(m, 0);
271 virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
274 int i, nbufs, error, size = vq->vq_nentries;
275 struct vring *vr = &vq->vq_ring;
276 uint8_t *ring_mem = vq->vq_ring_virt_mem;
278 PMD_INIT_FUNC_TRACE();
281 * Reinitialise since virtio port might have been stopped and restarted
283 memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
284 vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
285 vq->vq_used_cons_idx = 0;
286 vq->vq_desc_head_idx = 0;
287 vq->vq_avail_idx = 0;
288 vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
289 vq->vq_free_cnt = vq->vq_nentries;
290 memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
292 /* Chain all the descriptors in the ring with an END */
293 for (i = 0; i < size - 1; i++)
294 vr->desc[i].next = (uint16_t)(i + 1);
295 vr->desc[i].next = VQ_RING_DESC_CHAIN_END;
298 * Disable device(host) interrupting guest
300 virtqueue_disable_intr(vq);
302 /* Only rx virtqueue needs mbufs to be allocated at initialization */
303 if (queue_type == VTNET_RQ) {
304 if (vq->mpool == NULL)
305 rte_exit(EXIT_FAILURE,
306 "Cannot allocate initial mbufs for rx virtqueue");
308 /* Allocate blank mbufs for the each rx descriptor */
312 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
314 for (i = 0; i < vq->vq_nentries; i++) {
315 vq->vq_ring.avail->ring[i] = i;
316 vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
319 memset(&vq->fake_mbuf, 0, sizeof(vq->fake_mbuf));
320 for (i = 0; i < RTE_PMD_VIRTIO_RX_MAX_BURST; i++)
321 vq->sw_ring[vq->vq_nentries + i] = &vq->fake_mbuf;
323 while (!virtqueue_full(vq)) {
324 m = rte_rxmbuf_alloc(vq->mpool);
328 /******************************************
329 * Enqueue allocated buffers *
330 *******************************************/
331 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
333 error = virtqueue_enqueue_recv_refill_simple(vq, m);
336 error = virtqueue_enqueue_recv_refill(vq, m);
344 vq_update_avail_idx(vq);
346 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
347 } else if (queue_type == VTNET_TQ) {
348 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
349 if (use_simple_rxtx) {
350 int mid_idx = vq->vq_nentries >> 1;
351 for (i = 0; i < mid_idx; i++) {
352 vq->vq_ring.avail->ring[i] = i + mid_idx;
353 vq->vq_ring.desc[i + mid_idx].next = i;
354 vq->vq_ring.desc[i + mid_idx].addr =
355 vq->virtio_net_hdr_mem +
356 mid_idx * vq->hw->vtnet_hdr_size;
357 vq->vq_ring.desc[i + mid_idx].len =
358 vq->hw->vtnet_hdr_size;
359 vq->vq_ring.desc[i + mid_idx].flags =
361 vq->vq_ring.desc[i].flags = 0;
363 for (i = mid_idx; i < vq->vq_nentries; i++)
364 vq->vq_ring.avail->ring[i] = i;
371 virtio_dev_cq_start(struct rte_eth_dev *dev)
373 struct virtio_hw *hw = dev->data->dev_private;
376 virtio_dev_vring_start(hw->cvq, VTNET_CQ);
377 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq);
382 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
385 * Start receive and transmit vrings
386 * - Setup vring structure for all queues
387 * - Initialize descriptor for the rx vring
388 * - Allocate blank mbufs for the each rx descriptor
393 PMD_INIT_FUNC_TRACE();
395 /* Start rx vring. */
396 for (i = 0; i < dev->data->nb_rx_queues; i++) {
397 virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ);
398 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
401 /* Start tx vring. */
402 for (i = 0; i < dev->data->nb_tx_queues; i++) {
403 virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ);
404 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
409 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
412 unsigned int socket_id,
413 __rte_unused const struct rte_eth_rxconf *rx_conf,
414 struct rte_mempool *mp)
416 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
417 struct virtqueue *vq;
420 PMD_INIT_FUNC_TRACE();
421 ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
422 nb_desc, socket_id, &vq);
424 PMD_INIT_LOG(ERR, "rvq initialization failed");
428 /* Create mempool for rx mbuf allocation */
431 dev->data->rx_queues[queue_idx] = vq;
433 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
434 virtio_rxq_vec_setup(vq);
441 virtio_dev_rx_queue_release(void *rxq)
443 virtio_dev_queue_release(rxq);
447 * struct rte_eth_dev *dev: Used to update dev
448 * uint16_t nb_desc: Defaults to values read from config space
449 * unsigned int socket_id: Used to allocate memzone
450 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
451 * uint16_t queue_idx: Just used as an index in dev txq list
454 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
457 unsigned int socket_id,
458 const struct rte_eth_txconf *tx_conf)
460 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
462 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
463 struct virtio_hw *hw = dev->data->dev_private;
465 struct virtqueue *vq;
466 uint16_t tx_free_thresh;
469 PMD_INIT_FUNC_TRACE();
471 if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS)
472 != ETH_TXQ_FLAGS_NOXSUMS) {
473 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
477 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
478 /* Use simple rx/tx func if single segment and no offloads */
479 if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
480 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
481 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
482 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
483 dev->rx_pkt_burst = virtio_recv_pkts_vec;
488 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
489 nb_desc, socket_id, &vq);
491 PMD_INIT_LOG(ERR, "rvq initialization failed");
495 tx_free_thresh = tx_conf->tx_free_thresh;
496 if (tx_free_thresh == 0)
498 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
500 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
501 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
502 "number of TX entries minus 3 (%u)."
503 " (tx_free_thresh=%u port=%u queue=%u)\n",
505 tx_free_thresh, dev->data->port_id, queue_idx);
509 vq->vq_free_thresh = tx_free_thresh;
511 dev->data->tx_queues[queue_idx] = vq;
516 virtio_dev_tx_queue_release(void *txq)
518 virtio_dev_queue_release(txq);
522 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
526 * Requeue the discarded mbuf. This should always be
527 * successful since it was just dequeued.
529 error = virtqueue_enqueue_recv_refill(vq, m);
530 if (unlikely(error)) {
531 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
537 virtio_update_packet_stats(struct virtqueue *vq, struct rte_mbuf *mbuf)
539 uint32_t s = mbuf->pkt_len;
540 struct ether_addr *ea;
544 } else if (s > 64 && s < 1024) {
547 /* count zeros, and offset into correct bin */
548 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
549 vq->size_bins[bin]++;
559 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
560 vq->multicast += is_multicast_ether_addr(ea);
561 vq->broadcast += is_broadcast_ether_addr(ea);
564 #define VIRTIO_MBUF_BURST_SZ 64
565 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
567 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
569 struct virtqueue *rxvq = rx_queue;
570 struct virtio_hw *hw;
571 struct rte_mbuf *rxm, *new_mbuf;
572 uint16_t nb_used, num, nb_rx;
573 uint32_t len[VIRTIO_MBUF_BURST_SZ];
574 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
576 uint32_t i, nb_enqueued;
579 nb_used = VIRTQUEUE_NUSED(rxvq);
583 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
584 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
585 if (likely(num > DESC_PER_CACHELINE))
586 num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
591 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num);
592 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
597 hdr_size = hw->vtnet_hdr_size;
599 for (i = 0; i < num ; i++) {
602 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
604 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
605 PMD_RX_LOG(ERR, "Packet drop");
607 virtio_discard_rxbuf(rxvq, rxm);
612 rxm->port = rxvq->port_id;
613 rxm->data_off = RTE_PKTMBUF_HEADROOM;
619 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
620 rxm->data_len = (uint16_t)(len[i] - hdr_size);
625 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
627 rx_pkts[nb_rx++] = rxm;
629 rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len;
630 virtio_update_packet_stats(rxvq, rxm);
633 rxvq->packets += nb_rx;
635 /* Allocate new mbuf for the used descriptor */
637 while (likely(!virtqueue_full(rxvq))) {
638 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
639 if (unlikely(new_mbuf == NULL)) {
640 struct rte_eth_dev *dev
641 = &rte_eth_devices[rxvq->port_id];
642 dev->data->rx_mbuf_alloc_failed++;
645 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
646 if (unlikely(error)) {
647 rte_pktmbuf_free(new_mbuf);
653 if (likely(nb_enqueued)) {
654 vq_update_avail_idx(rxvq);
656 if (unlikely(virtqueue_kick_prepare(rxvq))) {
657 virtqueue_notify(rxvq);
658 PMD_RX_LOG(DEBUG, "Notified\n");
666 virtio_recv_mergeable_pkts(void *rx_queue,
667 struct rte_mbuf **rx_pkts,
670 struct virtqueue *rxvq = rx_queue;
671 struct virtio_hw *hw;
672 struct rte_mbuf *rxm, *new_mbuf;
673 uint16_t nb_used, num, nb_rx;
674 uint32_t len[VIRTIO_MBUF_BURST_SZ];
675 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
676 struct rte_mbuf *prev;
678 uint32_t i, nb_enqueued;
684 nb_used = VIRTQUEUE_NUSED(rxvq);
691 PMD_RX_LOG(DEBUG, "used:%d\n", nb_used);
700 hdr_size = hw->vtnet_hdr_size;
702 while (i < nb_used) {
703 struct virtio_net_hdr_mrg_rxbuf *header;
705 if (nb_rx == nb_pkts)
708 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1);
714 PMD_RX_LOG(DEBUG, "dequeue:%d\n", num);
715 PMD_RX_LOG(DEBUG, "packet len:%d\n", len[0]);
719 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
720 PMD_RX_LOG(ERR, "Packet drop\n");
722 virtio_discard_rxbuf(rxvq, rxm);
727 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
728 RTE_PKTMBUF_HEADROOM - hdr_size);
729 seg_num = header->num_buffers;
734 rxm->data_off = RTE_PKTMBUF_HEADROOM;
735 rxm->nb_segs = seg_num;
739 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
740 rxm->data_len = (uint16_t)(len[0] - hdr_size);
742 rxm->port = rxvq->port_id;
743 rx_pkts[nb_rx] = rxm;
746 seg_res = seg_num - 1;
748 while (seg_res != 0) {
750 * Get extra segments for current uncompleted packet.
753 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
754 if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) {
756 virtqueue_dequeue_burst_rx(rxvq,
757 rcv_pkts, len, rcv_cnt);
762 "No enough segments for packet.\n");
764 virtio_discard_rxbuf(rxvq, rxm);
771 while (extra_idx < rcv_cnt) {
772 rxm = rcv_pkts[extra_idx];
774 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
776 rxm->pkt_len = (uint32_t)(len[extra_idx]);
777 rxm->data_len = (uint16_t)(len[extra_idx]);
783 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
790 rte_vlan_strip(rx_pkts[nb_rx]);
792 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
793 rx_pkts[nb_rx]->data_len);
795 rxvq->bytes += rx_pkts[nb_rx]->pkt_len;
796 virtio_update_packet_stats(rxvq, rx_pkts[nb_rx]);
800 rxvq->packets += nb_rx;
802 /* Allocate new mbuf for the used descriptor */
804 while (likely(!virtqueue_full(rxvq))) {
805 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
806 if (unlikely(new_mbuf == NULL)) {
807 struct rte_eth_dev *dev
808 = &rte_eth_devices[rxvq->port_id];
809 dev->data->rx_mbuf_alloc_failed++;
812 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
813 if (unlikely(error)) {
814 rte_pktmbuf_free(new_mbuf);
820 if (likely(nb_enqueued)) {
821 vq_update_avail_idx(rxvq);
823 if (unlikely(virtqueue_kick_prepare(rxvq))) {
824 virtqueue_notify(rxvq);
825 PMD_RX_LOG(DEBUG, "Notified");
833 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
835 struct virtqueue *txvq = tx_queue;
836 uint16_t nb_used, nb_tx;
839 if (unlikely(nb_pkts < 1))
842 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
843 nb_used = VIRTQUEUE_NUSED(txvq);
846 if (likely(nb_used > txvq->vq_nentries - txvq->vq_free_thresh))
847 virtio_xmit_cleanup(txvq, nb_used);
849 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
850 struct rte_mbuf *txm = tx_pkts[nb_tx];
851 /* Need one more descriptor for virtio header. */
852 int need = txm->nb_segs - txvq->vq_free_cnt + 1;
854 /* Positive value indicates it need free vring descriptors */
855 if (unlikely(need > 0)) {
856 nb_used = VIRTQUEUE_NUSED(txvq);
858 need = RTE_MIN(need, (int)nb_used);
860 virtio_xmit_cleanup(txvq, need);
861 need = txm->nb_segs - txvq->vq_free_cnt + 1;
862 if (unlikely(need > 0)) {
864 "No free tx descriptors to transmit");
869 /* Do VLAN tag insertion */
870 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
871 error = rte_vlan_insert(&txm);
872 if (unlikely(error)) {
873 rte_pktmbuf_free(txm);
878 /* Enqueue Packet buffers */
879 error = virtqueue_enqueue_xmit(txvq, txm);
880 if (unlikely(error)) {
882 PMD_TX_LOG(ERR, "virtqueue_enqueue Free count = 0");
883 else if (error == EMSGSIZE)
884 PMD_TX_LOG(ERR, "virtqueue_enqueue Free count < 1");
886 PMD_TX_LOG(ERR, "virtqueue_enqueue error: %d", error);
890 txvq->bytes += txm->pkt_len;
891 virtio_update_packet_stats(txvq, txm);
894 txvq->packets += nb_tx;
897 vq_update_avail_idx(txvq);
899 if (unlikely(virtqueue_kick_prepare(txvq))) {
900 virtqueue_notify(txvq);
901 PMD_TX_LOG(DEBUG, "Notified backend after xmit");