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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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,
213 uint16_t needed, int use_indirect, int can_push)
215 struct vq_desc_extra *dxp;
216 struct vring_desc *start_dp;
217 uint16_t seg_num = cookie->nb_segs;
218 uint16_t head_idx, idx;
219 uint16_t head_size = txvq->hw->vtnet_hdr_size;
222 head_idx = txvq->vq_desc_head_idx;
224 dxp = &txvq->vq_descx[idx];
225 dxp->cookie = (void *)cookie;
226 dxp->ndescs = needed;
228 start_dp = txvq->vq_ring.desc;
231 /* put on zero'd transmit header (no offloads) */
232 void *hdr = rte_pktmbuf_prepend(cookie, head_size);
234 memset(hdr, 0, head_size);
235 } else if (use_indirect) {
236 /* setup tx ring slot to point to indirect
237 * descriptor list stored in reserved region.
239 * the first slot in indirect ring is already preset
240 * to point to the header in reserved region
242 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
244 offs = idx * sizeof(struct virtio_tx_region)
245 + offsetof(struct virtio_tx_region, tx_indir);
247 start_dp[idx].addr = txvq->virtio_net_hdr_mem + offs;
248 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
249 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
251 /* loop below will fill in rest of the indirect elements */
252 start_dp = txr[idx].tx_indir;
255 /* setup first tx ring slot to point to header
256 * stored in reserved region.
258 offs = idx * sizeof(struct virtio_tx_region)
259 + offsetof(struct virtio_tx_region, tx_hdr);
261 start_dp[idx].addr = txvq->virtio_net_hdr_mem + offs;
262 start_dp[idx].len = txvq->hw->vtnet_hdr_size;
263 start_dp[idx].flags = VRING_DESC_F_NEXT;
264 idx = start_dp[idx].next;
268 start_dp[idx].addr = rte_mbuf_data_dma_addr(cookie);
269 start_dp[idx].len = cookie->data_len;
270 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
271 idx = start_dp[idx].next;
272 } while ((cookie = cookie->next) != NULL);
275 idx = txvq->vq_ring.desc[head_idx].next;
277 txvq->vq_desc_head_idx = idx;
278 if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
279 txvq->vq_desc_tail_idx = idx;
280 txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed);
281 vq_update_avail_ring(txvq, head_idx);
285 virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
288 int i, nbufs, error, size = vq->vq_nentries;
289 struct vring *vr = &vq->vq_ring;
290 uint8_t *ring_mem = vq->vq_ring_virt_mem;
292 PMD_INIT_FUNC_TRACE();
295 * Reinitialise since virtio port might have been stopped and restarted
297 memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
298 vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
299 vq->vq_used_cons_idx = 0;
300 vq->vq_desc_head_idx = 0;
301 vq->vq_avail_idx = 0;
302 vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
303 vq->vq_free_cnt = vq->vq_nentries;
304 memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
306 vring_desc_init(vr->desc, size);
309 * Disable device(host) interrupting guest
311 virtqueue_disable_intr(vq);
313 /* Only rx virtqueue needs mbufs to be allocated at initialization */
314 if (queue_type == VTNET_RQ) {
315 if (vq->mpool == NULL)
316 rte_exit(EXIT_FAILURE,
317 "Cannot allocate initial mbufs for rx virtqueue");
319 /* Allocate blank mbufs for the each rx descriptor */
323 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
325 for (i = 0; i < vq->vq_nentries; i++) {
326 vq->vq_ring.avail->ring[i] = i;
327 vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
330 memset(&vq->fake_mbuf, 0, sizeof(vq->fake_mbuf));
331 for (i = 0; i < RTE_PMD_VIRTIO_RX_MAX_BURST; i++)
332 vq->sw_ring[vq->vq_nentries + i] = &vq->fake_mbuf;
334 while (!virtqueue_full(vq)) {
335 m = rte_mbuf_raw_alloc(vq->mpool);
339 /******************************************
340 * Enqueue allocated buffers *
341 *******************************************/
342 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
344 error = virtqueue_enqueue_recv_refill_simple(vq, m);
347 error = virtqueue_enqueue_recv_refill(vq, m);
355 vq_update_avail_idx(vq);
357 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
358 } else if (queue_type == VTNET_TQ) {
359 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
360 if (use_simple_rxtx) {
361 int mid_idx = vq->vq_nentries >> 1;
362 for (i = 0; i < mid_idx; i++) {
363 vq->vq_ring.avail->ring[i] = i + mid_idx;
364 vq->vq_ring.desc[i + mid_idx].next = i;
365 vq->vq_ring.desc[i + mid_idx].addr =
366 vq->virtio_net_hdr_mem +
367 offsetof(struct virtio_tx_region, tx_hdr);
368 vq->vq_ring.desc[i + mid_idx].len =
369 vq->hw->vtnet_hdr_size;
370 vq->vq_ring.desc[i + mid_idx].flags =
372 vq->vq_ring.desc[i].flags = 0;
374 for (i = mid_idx; i < vq->vq_nentries; i++)
375 vq->vq_ring.avail->ring[i] = i;
382 virtio_dev_cq_start(struct rte_eth_dev *dev)
384 struct virtio_hw *hw = dev->data->dev_private;
387 virtio_dev_vring_start(hw->cvq, VTNET_CQ);
388 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq);
393 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
396 * Start receive and transmit vrings
397 * - Setup vring structure for all queues
398 * - Initialize descriptor for the rx vring
399 * - Allocate blank mbufs for the each rx descriptor
404 PMD_INIT_FUNC_TRACE();
406 /* Start rx vring. */
407 for (i = 0; i < dev->data->nb_rx_queues; i++) {
408 virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ);
409 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
412 /* Start tx vring. */
413 for (i = 0; i < dev->data->nb_tx_queues; i++) {
414 virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ);
415 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
420 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
423 unsigned int socket_id,
424 __rte_unused const struct rte_eth_rxconf *rx_conf,
425 struct rte_mempool *mp)
427 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
428 struct virtqueue *vq;
431 PMD_INIT_FUNC_TRACE();
432 ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
433 nb_desc, socket_id, &vq);
435 PMD_INIT_LOG(ERR, "rvq initialization failed");
439 /* Create mempool for rx mbuf allocation */
442 dev->data->rx_queues[queue_idx] = vq;
444 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
445 virtio_rxq_vec_setup(vq);
452 virtio_dev_rx_queue_release(void *rxq)
454 virtio_dev_queue_release(rxq);
458 * struct rte_eth_dev *dev: Used to update dev
459 * uint16_t nb_desc: Defaults to values read from config space
460 * unsigned int socket_id: Used to allocate memzone
461 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
462 * uint16_t queue_idx: Just used as an index in dev txq list
465 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
468 unsigned int socket_id,
469 const struct rte_eth_txconf *tx_conf)
471 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
473 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
474 struct virtio_hw *hw = dev->data->dev_private;
476 struct virtqueue *vq;
477 uint16_t tx_free_thresh;
480 PMD_INIT_FUNC_TRACE();
482 if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS)
483 != ETH_TXQ_FLAGS_NOXSUMS) {
484 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
488 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
489 /* Use simple rx/tx func if single segment and no offloads */
490 if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
491 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
492 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
493 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
494 dev->rx_pkt_burst = virtio_recv_pkts_vec;
499 ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
500 nb_desc, socket_id, &vq);
502 PMD_INIT_LOG(ERR, "rvq initialization failed");
506 tx_free_thresh = tx_conf->tx_free_thresh;
507 if (tx_free_thresh == 0)
509 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
511 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
512 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
513 "number of TX entries minus 3 (%u)."
514 " (tx_free_thresh=%u port=%u queue=%u)\n",
516 tx_free_thresh, dev->data->port_id, queue_idx);
520 vq->vq_free_thresh = tx_free_thresh;
522 dev->data->tx_queues[queue_idx] = vq;
527 virtio_dev_tx_queue_release(void *txq)
529 virtio_dev_queue_release(txq);
533 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
537 * Requeue the discarded mbuf. This should always be
538 * successful since it was just dequeued.
540 error = virtqueue_enqueue_recv_refill(vq, m);
541 if (unlikely(error)) {
542 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
548 virtio_update_packet_stats(struct virtqueue *vq, struct rte_mbuf *mbuf)
550 uint32_t s = mbuf->pkt_len;
551 struct ether_addr *ea;
555 } else if (s > 64 && s < 1024) {
558 /* count zeros, and offset into correct bin */
559 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
560 vq->size_bins[bin]++;
570 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
571 if (is_multicast_ether_addr(ea)) {
572 if (is_broadcast_ether_addr(ea))
579 #define VIRTIO_MBUF_BURST_SZ 64
580 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
582 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
584 struct virtqueue *rxvq = rx_queue;
585 struct virtio_hw *hw;
586 struct rte_mbuf *rxm, *new_mbuf;
587 uint16_t nb_used, num, nb_rx;
588 uint32_t len[VIRTIO_MBUF_BURST_SZ];
589 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
591 uint32_t i, nb_enqueued;
594 nb_used = VIRTQUEUE_NUSED(rxvq);
598 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
599 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
600 if (likely(num > DESC_PER_CACHELINE))
601 num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
603 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num);
604 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
609 hdr_size = hw->vtnet_hdr_size;
611 for (i = 0; i < num ; i++) {
614 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
616 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
617 PMD_RX_LOG(ERR, "Packet drop");
619 virtio_discard_rxbuf(rxvq, rxm);
624 rxm->port = rxvq->port_id;
625 rxm->data_off = RTE_PKTMBUF_HEADROOM;
631 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
632 rxm->data_len = (uint16_t)(len[i] - hdr_size);
637 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
639 rx_pkts[nb_rx++] = rxm;
641 rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len;
642 virtio_update_packet_stats(rxvq, rxm);
645 rxvq->packets += nb_rx;
647 /* Allocate new mbuf for the used descriptor */
649 while (likely(!virtqueue_full(rxvq))) {
650 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
651 if (unlikely(new_mbuf == NULL)) {
652 struct rte_eth_dev *dev
653 = &rte_eth_devices[rxvq->port_id];
654 dev->data->rx_mbuf_alloc_failed++;
657 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
658 if (unlikely(error)) {
659 rte_pktmbuf_free(new_mbuf);
665 if (likely(nb_enqueued)) {
666 vq_update_avail_idx(rxvq);
668 if (unlikely(virtqueue_kick_prepare(rxvq))) {
669 virtqueue_notify(rxvq);
670 PMD_RX_LOG(DEBUG, "Notified");
678 virtio_recv_mergeable_pkts(void *rx_queue,
679 struct rte_mbuf **rx_pkts,
682 struct virtqueue *rxvq = rx_queue;
683 struct virtio_hw *hw;
684 struct rte_mbuf *rxm, *new_mbuf;
685 uint16_t nb_used, num, nb_rx;
686 uint32_t len[VIRTIO_MBUF_BURST_SZ];
687 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
688 struct rte_mbuf *prev;
690 uint32_t i, nb_enqueued;
696 nb_used = VIRTQUEUE_NUSED(rxvq);
700 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
709 hdr_size = hw->vtnet_hdr_size;
711 while (i < nb_used) {
712 struct virtio_net_hdr_mrg_rxbuf *header;
714 if (nb_rx == nb_pkts)
717 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1);
723 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
724 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
728 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
729 PMD_RX_LOG(ERR, "Packet drop");
731 virtio_discard_rxbuf(rxvq, rxm);
736 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
737 RTE_PKTMBUF_HEADROOM - hdr_size);
738 seg_num = header->num_buffers;
743 rxm->data_off = RTE_PKTMBUF_HEADROOM;
744 rxm->nb_segs = seg_num;
748 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
749 rxm->data_len = (uint16_t)(len[0] - hdr_size);
751 rxm->port = rxvq->port_id;
752 rx_pkts[nb_rx] = rxm;
755 seg_res = seg_num - 1;
757 while (seg_res != 0) {
759 * Get extra segments for current uncompleted packet.
762 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
763 if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) {
765 virtqueue_dequeue_burst_rx(rxvq,
766 rcv_pkts, len, rcv_cnt);
771 "No enough segments for packet.");
773 virtio_discard_rxbuf(rxvq, rxm);
780 while (extra_idx < rcv_cnt) {
781 rxm = rcv_pkts[extra_idx];
783 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
785 rxm->pkt_len = (uint32_t)(len[extra_idx]);
786 rxm->data_len = (uint16_t)(len[extra_idx]);
792 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
799 rte_vlan_strip(rx_pkts[nb_rx]);
801 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
802 rx_pkts[nb_rx]->data_len);
804 rxvq->bytes += rx_pkts[nb_rx]->pkt_len;
805 virtio_update_packet_stats(rxvq, rx_pkts[nb_rx]);
809 rxvq->packets += nb_rx;
811 /* Allocate new mbuf for the used descriptor */
813 while (likely(!virtqueue_full(rxvq))) {
814 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
815 if (unlikely(new_mbuf == NULL)) {
816 struct rte_eth_dev *dev
817 = &rte_eth_devices[rxvq->port_id];
818 dev->data->rx_mbuf_alloc_failed++;
821 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
822 if (unlikely(error)) {
823 rte_pktmbuf_free(new_mbuf);
829 if (likely(nb_enqueued)) {
830 vq_update_avail_idx(rxvq);
832 if (unlikely(virtqueue_kick_prepare(rxvq))) {
833 virtqueue_notify(rxvq);
834 PMD_RX_LOG(DEBUG, "Notified");
842 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
844 struct virtqueue *txvq = tx_queue;
845 struct virtio_hw *hw = txvq->hw;
846 uint16_t hdr_size = hw->vtnet_hdr_size;
847 uint16_t nb_used, nb_tx;
850 if (unlikely(nb_pkts < 1))
853 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
854 nb_used = VIRTQUEUE_NUSED(txvq);
857 if (likely(nb_used > txvq->vq_nentries - txvq->vq_free_thresh))
858 virtio_xmit_cleanup(txvq, nb_used);
860 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
861 struct rte_mbuf *txm = tx_pkts[nb_tx];
862 int can_push = 0, use_indirect = 0, slots, need;
864 /* Do VLAN tag insertion */
865 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
866 error = rte_vlan_insert(&txm);
867 if (unlikely(error)) {
868 rte_pktmbuf_free(txm);
873 /* optimize ring usage */
874 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
875 rte_mbuf_refcnt_read(txm) == 1 &&
877 rte_pktmbuf_headroom(txm) >= hdr_size &&
878 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
879 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
881 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
882 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
885 /* How many main ring entries are needed to this Tx?
886 * any_layout => number of segments
888 * default => number of segments + 1
890 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
891 need = slots - txvq->vq_free_cnt;
893 /* Positive value indicates it need free vring descriptors */
894 if (unlikely(need > 0)) {
895 nb_used = VIRTQUEUE_NUSED(txvq);
897 need = RTE_MIN(need, (int)nb_used);
899 virtio_xmit_cleanup(txvq, need);
900 need = slots - txvq->vq_free_cnt;
901 if (unlikely(need > 0)) {
903 "No free tx descriptors to transmit");
908 /* Enqueue Packet buffers */
909 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
911 txvq->bytes += txm->pkt_len;
912 virtio_update_packet_stats(txvq, txm);
915 txvq->packets += nb_tx;
918 vq_update_avail_idx(txvq);
920 if (unlikely(virtqueue_kick_prepare(txvq))) {
921 virtqueue_notify(txvq);
922 PMD_TX_LOG(DEBUG, "Notified backend after xmit");