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"
35 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
36 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
38 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
42 virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
44 struct virtnet_rx *rxvq = rxq;
45 struct virtqueue *vq = rxvq->vq;
47 return VIRTQUEUE_NUSED(vq) >= offset;
51 vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
53 vq->vq_free_cnt += num;
54 vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
58 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
60 struct vring_desc *dp, *dp_tail;
61 struct vq_desc_extra *dxp;
62 uint16_t desc_idx_last = desc_idx;
64 dp = &vq->vq_ring.desc[desc_idx];
65 dxp = &vq->vq_descx[desc_idx];
66 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
67 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
68 while (dp->flags & VRING_DESC_F_NEXT) {
69 desc_idx_last = dp->next;
70 dp = &vq->vq_ring.desc[dp->next];
76 * We must append the existing free chain, if any, to the end of
77 * newly freed chain. If the virtqueue was completely used, then
78 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
80 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
81 vq->vq_desc_head_idx = desc_idx;
83 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
84 dp_tail->next = desc_idx;
87 vq->vq_desc_tail_idx = desc_idx_last;
88 dp->next = VQ_RING_DESC_CHAIN_END;
92 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
93 uint32_t *len, uint16_t num)
95 struct vring_used_elem *uep;
96 struct rte_mbuf *cookie;
97 uint16_t used_idx, desc_idx;
100 /* Caller does the check */
101 for (i = 0; i < num ; i++) {
102 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
103 uep = &vq->vq_ring.used->ring[used_idx];
104 desc_idx = (uint16_t) uep->id;
106 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
108 if (unlikely(cookie == NULL)) {
109 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
110 vq->vq_used_cons_idx);
114 rte_prefetch0(cookie);
115 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
117 vq->vq_used_cons_idx++;
118 vq_ring_free_chain(vq, desc_idx);
119 vq->vq_descx[desc_idx].cookie = NULL;
125 #ifndef DEFAULT_TX_FREE_THRESH
126 #define DEFAULT_TX_FREE_THRESH 32
129 /* Cleanup from completed transmits. */
131 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
133 uint16_t i, used_idx, desc_idx;
134 for (i = 0; i < num; i++) {
135 struct vring_used_elem *uep;
136 struct vq_desc_extra *dxp;
138 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
139 uep = &vq->vq_ring.used->ring[used_idx];
141 desc_idx = (uint16_t) uep->id;
142 dxp = &vq->vq_descx[desc_idx];
143 vq->vq_used_cons_idx++;
144 vq_ring_free_chain(vq, desc_idx);
146 if (dxp->cookie != NULL) {
147 rte_pktmbuf_free(dxp->cookie);
155 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
157 struct vq_desc_extra *dxp;
158 struct virtio_hw *hw = vq->hw;
159 struct vring_desc *start_dp;
161 uint16_t head_idx, idx;
163 if (unlikely(vq->vq_free_cnt == 0))
165 if (unlikely(vq->vq_free_cnt < needed))
168 head_idx = vq->vq_desc_head_idx;
169 if (unlikely(head_idx >= vq->vq_nentries))
173 dxp = &vq->vq_descx[idx];
174 dxp->cookie = (void *)cookie;
175 dxp->ndescs = needed;
177 start_dp = vq->vq_ring.desc;
179 VIRTIO_MBUF_ADDR(cookie, vq) +
180 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
182 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
183 start_dp[idx].flags = VRING_DESC_F_WRITE;
184 idx = start_dp[idx].next;
185 vq->vq_desc_head_idx = idx;
186 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
187 vq->vq_desc_tail_idx = idx;
188 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
189 vq_update_avail_ring(vq, head_idx);
194 /* When doing TSO, the IP length is not included in the pseudo header
195 * checksum of the packet given to the PMD, but for virtio it is
199 virtio_tso_fix_cksum(struct rte_mbuf *m)
201 /* common case: header is not fragmented */
202 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
204 struct ipv4_hdr *iph;
205 struct ipv6_hdr *ip6h;
207 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
210 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
211 th = RTE_PTR_ADD(iph, m->l3_len);
212 if ((iph->version_ihl >> 4) == 4) {
213 iph->hdr_checksum = 0;
214 iph->hdr_checksum = rte_ipv4_cksum(iph);
215 ip_len = iph->total_length;
216 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
219 ip6h = (struct ipv6_hdr *)iph;
220 ip_paylen = ip6h->payload_len;
223 /* calculate the new phdr checksum not including ip_paylen */
224 prev_cksum = th->cksum;
227 tmp = (tmp & 0xffff) + (tmp >> 16);
230 /* replace it in the packet */
231 th->cksum = new_cksum;
236 tx_offload_enabled(struct virtio_hw *hw)
238 return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
239 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
240 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
243 /* avoid write operation when necessary, to lessen cache issues */
244 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
245 if ((var) != (val)) \
250 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
251 struct rte_mbuf *cookie,
255 if (cookie->ol_flags & PKT_TX_TCP_SEG)
256 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
258 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
259 case PKT_TX_UDP_CKSUM:
260 hdr->csum_start = cookie->l2_len + cookie->l3_len;
261 hdr->csum_offset = offsetof(struct udp_hdr,
263 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
266 case PKT_TX_TCP_CKSUM:
267 hdr->csum_start = cookie->l2_len + cookie->l3_len;
268 hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
269 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
273 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
274 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
275 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
279 /* TCP Segmentation Offload */
280 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
281 virtio_tso_fix_cksum(cookie);
282 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
283 VIRTIO_NET_HDR_GSO_TCPV6 :
284 VIRTIO_NET_HDR_GSO_TCPV4;
285 hdr->gso_size = cookie->tso_segsz;
291 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
292 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
293 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
299 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
300 uint16_t needed, int use_indirect, int can_push)
302 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
303 struct vq_desc_extra *dxp;
304 struct virtqueue *vq = txvq->vq;
305 struct vring_desc *start_dp;
306 uint16_t seg_num = cookie->nb_segs;
307 uint16_t head_idx, idx;
308 uint16_t head_size = vq->hw->vtnet_hdr_size;
309 struct virtio_net_hdr *hdr;
312 offload = tx_offload_enabled(vq->hw);
313 head_idx = vq->vq_desc_head_idx;
315 dxp = &vq->vq_descx[idx];
316 dxp->cookie = (void *)cookie;
317 dxp->ndescs = needed;
319 start_dp = vq->vq_ring.desc;
322 /* prepend cannot fail, checked by caller */
323 hdr = (struct virtio_net_hdr *)
324 rte_pktmbuf_prepend(cookie, head_size);
325 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
326 * which is wrong. Below subtract restores correct pkt size.
328 cookie->pkt_len -= head_size;
329 /* if offload disabled, it is not zeroed below, do it now */
331 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
332 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
333 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
334 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
335 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
336 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
338 } else if (use_indirect) {
339 /* setup tx ring slot to point to indirect
340 * descriptor list stored in reserved region.
342 * the first slot in indirect ring is already preset
343 * to point to the header in reserved region
345 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
346 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
347 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
348 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
349 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
351 /* loop below will fill in rest of the indirect elements */
352 start_dp = txr[idx].tx_indir;
355 /* setup first tx ring slot to point to header
356 * stored in reserved region.
358 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
359 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
360 start_dp[idx].len = vq->hw->vtnet_hdr_size;
361 start_dp[idx].flags = VRING_DESC_F_NEXT;
362 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
364 idx = start_dp[idx].next;
367 virtqueue_xmit_offload(hdr, cookie, offload);
370 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
371 start_dp[idx].len = cookie->data_len;
372 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
373 idx = start_dp[idx].next;
374 } while ((cookie = cookie->next) != NULL);
377 idx = vq->vq_ring.desc[head_idx].next;
379 vq->vq_desc_head_idx = idx;
380 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
381 vq->vq_desc_tail_idx = idx;
382 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
383 vq_update_avail_ring(vq, head_idx);
387 virtio_dev_cq_start(struct rte_eth_dev *dev)
389 struct virtio_hw *hw = dev->data->dev_private;
391 if (hw->cvq && hw->cvq->vq) {
392 rte_spinlock_init(&hw->cvq->lock);
393 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
398 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
401 unsigned int socket_id __rte_unused,
402 const struct rte_eth_rxconf *rx_conf __rte_unused,
403 struct rte_mempool *mp)
405 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
406 struct virtio_hw *hw = dev->data->dev_private;
407 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
408 struct virtnet_rx *rxvq;
410 PMD_INIT_FUNC_TRACE();
412 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
413 nb_desc = vq->vq_nentries;
414 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
417 rxvq->queue_id = queue_idx;
419 if (rxvq->mpool == NULL) {
420 rte_exit(EXIT_FAILURE,
421 "Cannot allocate mbufs for rx virtqueue");
424 dev->data->rx_queues[queue_idx] = rxvq;
430 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
432 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
433 struct virtio_hw *hw = dev->data->dev_private;
434 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
435 struct virtnet_rx *rxvq = &vq->rxq;
440 PMD_INIT_FUNC_TRACE();
442 /* Allocate blank mbufs for the each rx descriptor */
445 if (hw->use_simple_rx) {
446 for (desc_idx = 0; desc_idx < vq->vq_nentries;
448 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
449 vq->vq_ring.desc[desc_idx].flags =
453 virtio_rxq_vec_setup(rxvq);
456 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
457 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
459 vq->sw_ring[vq->vq_nentries + desc_idx] =
463 if (hw->use_simple_rx) {
464 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
465 virtio_rxq_rearm_vec(rxvq);
466 nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
469 while (!virtqueue_full(vq)) {
470 m = rte_mbuf_raw_alloc(rxvq->mpool);
474 /* Enqueue allocated buffers */
475 error = virtqueue_enqueue_recv_refill(vq, m);
483 vq_update_avail_idx(vq);
486 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
494 * struct rte_eth_dev *dev: Used to update dev
495 * uint16_t nb_desc: Defaults to values read from config space
496 * unsigned int socket_id: Used to allocate memzone
497 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
498 * uint16_t queue_idx: Just used as an index in dev txq list
501 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
504 unsigned int socket_id __rte_unused,
505 const struct rte_eth_txconf *tx_conf)
507 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
508 struct virtio_hw *hw = dev->data->dev_private;
509 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
510 struct virtnet_tx *txvq;
511 uint16_t tx_free_thresh;
513 PMD_INIT_FUNC_TRACE();
515 /* cannot use simple rxtx funcs with multisegs or offloads */
516 if (dev->data->dev_conf.txmode.offloads)
517 hw->use_simple_tx = 0;
519 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
520 nb_desc = vq->vq_nentries;
521 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
524 txvq->queue_id = queue_idx;
526 tx_free_thresh = tx_conf->tx_free_thresh;
527 if (tx_free_thresh == 0)
529 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
531 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
532 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
533 "number of TX entries minus 3 (%u)."
534 " (tx_free_thresh=%u port=%u queue=%u)\n",
536 tx_free_thresh, dev->data->port_id, queue_idx);
540 vq->vq_free_thresh = tx_free_thresh;
542 dev->data->tx_queues[queue_idx] = txvq;
547 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
550 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
551 struct virtio_hw *hw = dev->data->dev_private;
552 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
553 uint16_t mid_idx = vq->vq_nentries >> 1;
554 struct virtnet_tx *txvq = &vq->txq;
557 PMD_INIT_FUNC_TRACE();
559 if (hw->use_simple_tx) {
560 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
561 vq->vq_ring.avail->ring[desc_idx] =
563 vq->vq_ring.desc[desc_idx + mid_idx].next =
565 vq->vq_ring.desc[desc_idx + mid_idx].addr =
566 txvq->virtio_net_hdr_mem +
567 offsetof(struct virtio_tx_region, tx_hdr);
568 vq->vq_ring.desc[desc_idx + mid_idx].len =
569 vq->hw->vtnet_hdr_size;
570 vq->vq_ring.desc[desc_idx + mid_idx].flags =
572 vq->vq_ring.desc[desc_idx].flags = 0;
574 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
576 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
585 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
589 * Requeue the discarded mbuf. This should always be
590 * successful since it was just dequeued.
592 error = virtqueue_enqueue_recv_refill(vq, m);
593 if (unlikely(error)) {
594 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
600 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
602 uint32_t s = mbuf->pkt_len;
603 struct ether_addr *ea;
606 stats->size_bins[1]++;
607 } else if (s > 64 && s < 1024) {
610 /* count zeros, and offset into correct bin */
611 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
612 stats->size_bins[bin]++;
615 stats->size_bins[0]++;
617 stats->size_bins[6]++;
619 stats->size_bins[7]++;
622 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
623 if (is_multicast_ether_addr(ea)) {
624 if (is_broadcast_ether_addr(ea))
632 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
634 VIRTIO_DUMP_PACKET(m, m->data_len);
636 rxvq->stats.bytes += m->pkt_len;
637 virtio_update_packet_stats(&rxvq->stats, m);
640 /* Optionally fill offload information in structure */
642 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
644 struct rte_net_hdr_lens hdr_lens;
645 uint32_t hdrlen, ptype;
646 int l4_supported = 0;
649 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
652 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
654 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
655 m->packet_type = ptype;
656 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
657 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
658 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
661 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
662 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
663 if (hdr->csum_start <= hdrlen && l4_supported) {
664 m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
666 /* Unknown proto or tunnel, do sw cksum. We can assume
667 * the cksum field is in the first segment since the
668 * buffers we provided to the host are large enough.
669 * In case of SCTP, this will be wrong since it's a CRC
670 * but there's nothing we can do.
672 uint16_t csum = 0, off;
674 rte_raw_cksum_mbuf(m, hdr->csum_start,
675 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
677 if (likely(csum != 0xffff))
679 off = hdr->csum_offset + hdr->csum_start;
680 if (rte_pktmbuf_data_len(m) >= off + 1)
681 *rte_pktmbuf_mtod_offset(m, uint16_t *,
684 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
685 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
688 /* GSO request, save required information in mbuf */
689 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
690 /* Check unsupported modes */
691 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
692 (hdr->gso_size == 0)) {
696 /* Update mss lengthes in mbuf */
697 m->tso_segsz = hdr->gso_size;
698 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
699 case VIRTIO_NET_HDR_GSO_TCPV4:
700 case VIRTIO_NET_HDR_GSO_TCPV6:
701 m->ol_flags |= PKT_RX_LRO | \
702 PKT_RX_L4_CKSUM_NONE;
713 rx_offload_enabled(struct virtio_hw *hw)
715 return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
716 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
717 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
720 #define VIRTIO_MBUF_BURST_SZ 64
721 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
723 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
725 struct virtnet_rx *rxvq = rx_queue;
726 struct virtqueue *vq = rxvq->vq;
727 struct virtio_hw *hw = vq->hw;
728 struct rte_mbuf *rxm, *new_mbuf;
729 uint16_t nb_used, num, nb_rx;
730 uint32_t len[VIRTIO_MBUF_BURST_SZ];
731 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
733 uint32_t i, nb_enqueued;
736 struct virtio_net_hdr *hdr;
739 if (unlikely(hw->started == 0))
742 nb_used = VIRTQUEUE_NUSED(vq);
746 num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
747 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
748 num = VIRTIO_MBUF_BURST_SZ;
749 if (likely(num > DESC_PER_CACHELINE))
750 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
752 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
753 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
756 hdr_size = hw->vtnet_hdr_size;
757 offload = rx_offload_enabled(hw);
759 for (i = 0; i < num ; i++) {
762 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
764 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
765 PMD_RX_LOG(ERR, "Packet drop");
767 virtio_discard_rxbuf(vq, rxm);
768 rxvq->stats.errors++;
772 rxm->port = rxvq->port_id;
773 rxm->data_off = RTE_PKTMBUF_HEADROOM;
777 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
778 rxm->data_len = (uint16_t)(len[i] - hdr_size);
780 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
781 RTE_PKTMBUF_HEADROOM - hdr_size);
786 if (offload && virtio_rx_offload(rxm, hdr) < 0) {
787 virtio_discard_rxbuf(vq, rxm);
788 rxvq->stats.errors++;
792 virtio_rx_stats_updated(rxvq, rxm);
794 rx_pkts[nb_rx++] = rxm;
797 rxvq->stats.packets += nb_rx;
799 /* Allocate new mbuf for the used descriptor */
801 while (likely(!virtqueue_full(vq))) {
802 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
803 if (unlikely(new_mbuf == NULL)) {
804 struct rte_eth_dev *dev
805 = &rte_eth_devices[rxvq->port_id];
806 dev->data->rx_mbuf_alloc_failed++;
809 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
810 if (unlikely(error)) {
811 rte_pktmbuf_free(new_mbuf);
817 if (likely(nb_enqueued)) {
818 vq_update_avail_idx(vq);
820 if (unlikely(virtqueue_kick_prepare(vq))) {
821 virtqueue_notify(vq);
822 PMD_RX_LOG(DEBUG, "Notified");
830 virtio_recv_mergeable_pkts(void *rx_queue,
831 struct rte_mbuf **rx_pkts,
834 struct virtnet_rx *rxvq = rx_queue;
835 struct virtqueue *vq = rxvq->vq;
836 struct virtio_hw *hw = vq->hw;
837 struct rte_mbuf *rxm, *new_mbuf;
838 uint16_t nb_used, num, nb_rx;
839 uint32_t len[VIRTIO_MBUF_BURST_SZ];
840 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
841 struct rte_mbuf *prev;
843 uint32_t i, nb_enqueued;
851 if (unlikely(hw->started == 0))
854 nb_used = VIRTQUEUE_NUSED(vq);
858 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
865 hdr_size = hw->vtnet_hdr_size;
866 offload = rx_offload_enabled(hw);
868 while (i < nb_used) {
869 struct virtio_net_hdr_mrg_rxbuf *header;
871 if (nb_rx == nb_pkts)
874 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
880 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
881 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
885 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
886 PMD_RX_LOG(ERR, "Packet drop");
888 virtio_discard_rxbuf(vq, rxm);
889 rxvq->stats.errors++;
893 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
894 RTE_PKTMBUF_HEADROOM - hdr_size);
895 seg_num = header->num_buffers;
900 rxm->data_off = RTE_PKTMBUF_HEADROOM;
901 rxm->nb_segs = seg_num;
904 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
905 rxm->data_len = (uint16_t)(len[0] - hdr_size);
907 rxm->port = rxvq->port_id;
908 rx_pkts[nb_rx] = rxm;
911 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
912 virtio_discard_rxbuf(vq, rxm);
913 rxvq->stats.errors++;
917 seg_res = seg_num - 1;
919 while (seg_res != 0) {
921 * Get extra segments for current uncompleted packet.
924 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
925 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
927 virtqueue_dequeue_burst_rx(vq,
928 rcv_pkts, len, rcv_cnt);
933 "No enough segments for packet.");
935 virtio_discard_rxbuf(vq, rxm);
936 rxvq->stats.errors++;
942 while (extra_idx < rcv_cnt) {
943 rxm = rcv_pkts[extra_idx];
945 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
946 rxm->pkt_len = (uint32_t)(len[extra_idx]);
947 rxm->data_len = (uint16_t)(len[extra_idx]);
953 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
960 rte_vlan_strip(rx_pkts[nb_rx]);
962 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
963 rx_pkts[nb_rx]->data_len);
965 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
966 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
970 rxvq->stats.packets += nb_rx;
972 /* Allocate new mbuf for the used descriptor */
974 while (likely(!virtqueue_full(vq))) {
975 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
976 if (unlikely(new_mbuf == NULL)) {
977 struct rte_eth_dev *dev
978 = &rte_eth_devices[rxvq->port_id];
979 dev->data->rx_mbuf_alloc_failed++;
982 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
983 if (unlikely(error)) {
984 rte_pktmbuf_free(new_mbuf);
990 if (likely(nb_enqueued)) {
991 vq_update_avail_idx(vq);
993 if (unlikely(virtqueue_kick_prepare(vq))) {
994 virtqueue_notify(vq);
995 PMD_RX_LOG(DEBUG, "Notified");
1003 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1005 struct virtnet_tx *txvq = tx_queue;
1006 struct virtqueue *vq = txvq->vq;
1007 struct virtio_hw *hw = vq->hw;
1008 uint16_t hdr_size = hw->vtnet_hdr_size;
1009 uint16_t nb_used, nb_tx = 0;
1012 if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1015 if (unlikely(nb_pkts < 1))
1018 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1019 nb_used = VIRTQUEUE_NUSED(vq);
1022 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1023 virtio_xmit_cleanup(vq, nb_used);
1025 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1026 struct rte_mbuf *txm = tx_pkts[nb_tx];
1027 int can_push = 0, use_indirect = 0, slots, need;
1029 /* Do VLAN tag insertion */
1030 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1031 error = rte_vlan_insert(&txm);
1032 if (unlikely(error)) {
1033 rte_pktmbuf_free(txm);
1038 /* optimize ring usage */
1039 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1040 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1041 rte_mbuf_refcnt_read(txm) == 1 &&
1042 RTE_MBUF_DIRECT(txm) &&
1043 txm->nb_segs == 1 &&
1044 rte_pktmbuf_headroom(txm) >= hdr_size &&
1045 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1046 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1048 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1049 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1052 /* How many main ring entries are needed to this Tx?
1053 * any_layout => number of segments
1055 * default => number of segments + 1
1057 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1058 need = slots - vq->vq_free_cnt;
1060 /* Positive value indicates it need free vring descriptors */
1061 if (unlikely(need > 0)) {
1062 nb_used = VIRTQUEUE_NUSED(vq);
1064 need = RTE_MIN(need, (int)nb_used);
1066 virtio_xmit_cleanup(vq, need);
1067 need = slots - vq->vq_free_cnt;
1068 if (unlikely(need > 0)) {
1070 "No free tx descriptors to transmit");
1075 /* Enqueue Packet buffers */
1076 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
1078 txvq->stats.bytes += txm->pkt_len;
1079 virtio_update_packet_stats(&txvq->stats, txm);
1082 txvq->stats.packets += nb_tx;
1084 if (likely(nb_tx)) {
1085 vq_update_avail_idx(vq);
1087 if (unlikely(virtqueue_kick_prepare(vq))) {
1088 virtqueue_notify(vq);
1089 PMD_TX_LOG(DEBUG, "Notified backend after xmit");