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
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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>
53 #include <rte_cpuflags.h>
59 #include "virtio_logs.h"
60 #include "virtio_ethdev.h"
61 #include "virtio_pci.h"
62 #include "virtqueue.h"
63 #include "virtio_rxtx.h"
65 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
66 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
68 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
72 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
73 ETH_TXQ_FLAGS_NOOFFLOADS)
76 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
78 struct vring_desc *dp, *dp_tail;
79 struct vq_desc_extra *dxp;
80 uint16_t desc_idx_last = desc_idx;
82 dp = &vq->vq_ring.desc[desc_idx];
83 dxp = &vq->vq_descx[desc_idx];
84 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
85 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
86 while (dp->flags & VRING_DESC_F_NEXT) {
87 desc_idx_last = dp->next;
88 dp = &vq->vq_ring.desc[dp->next];
94 * We must append the existing free chain, if any, to the end of
95 * newly freed chain. If the virtqueue was completely used, then
96 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
98 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
99 vq->vq_desc_head_idx = desc_idx;
101 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
102 dp_tail->next = desc_idx;
105 vq->vq_desc_tail_idx = desc_idx_last;
106 dp->next = VQ_RING_DESC_CHAIN_END;
110 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
111 uint32_t *len, uint16_t num)
113 struct vring_used_elem *uep;
114 struct rte_mbuf *cookie;
115 uint16_t used_idx, desc_idx;
118 /* Caller does the check */
119 for (i = 0; i < num ; i++) {
120 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
121 uep = &vq->vq_ring.used->ring[used_idx];
122 desc_idx = (uint16_t) uep->id;
124 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
126 if (unlikely(cookie == NULL)) {
127 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
128 vq->vq_used_cons_idx);
132 rte_prefetch0(cookie);
133 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
135 vq->vq_used_cons_idx++;
136 vq_ring_free_chain(vq, desc_idx);
137 vq->vq_descx[desc_idx].cookie = NULL;
143 #ifndef DEFAULT_TX_FREE_THRESH
144 #define DEFAULT_TX_FREE_THRESH 32
147 /* Cleanup from completed transmits. */
149 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
151 uint16_t i, used_idx, desc_idx;
152 for (i = 0; i < num; i++) {
153 struct vring_used_elem *uep;
154 struct vq_desc_extra *dxp;
156 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
157 uep = &vq->vq_ring.used->ring[used_idx];
159 desc_idx = (uint16_t) uep->id;
160 dxp = &vq->vq_descx[desc_idx];
161 vq->vq_used_cons_idx++;
162 vq_ring_free_chain(vq, desc_idx);
164 if (dxp->cookie != NULL) {
165 rte_pktmbuf_free(dxp->cookie);
173 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
175 struct vq_desc_extra *dxp;
176 struct virtio_hw *hw = vq->hw;
177 struct vring_desc *start_dp;
179 uint16_t head_idx, idx;
181 if (unlikely(vq->vq_free_cnt == 0))
183 if (unlikely(vq->vq_free_cnt < needed))
186 head_idx = vq->vq_desc_head_idx;
187 if (unlikely(head_idx >= vq->vq_nentries))
191 dxp = &vq->vq_descx[idx];
192 dxp->cookie = (void *)cookie;
193 dxp->ndescs = needed;
195 start_dp = vq->vq_ring.desc;
197 VIRTIO_MBUF_ADDR(cookie, vq) +
198 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
200 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
201 start_dp[idx].flags = VRING_DESC_F_WRITE;
202 idx = start_dp[idx].next;
203 vq->vq_desc_head_idx = idx;
204 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
205 vq->vq_desc_tail_idx = idx;
206 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
207 vq_update_avail_ring(vq, head_idx);
212 /* When doing TSO, the IP length is not included in the pseudo header
213 * checksum of the packet given to the PMD, but for virtio it is
217 virtio_tso_fix_cksum(struct rte_mbuf *m)
219 /* common case: header is not fragmented */
220 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
222 struct ipv4_hdr *iph;
223 struct ipv6_hdr *ip6h;
225 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
228 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
229 th = RTE_PTR_ADD(iph, m->l3_len);
230 if ((iph->version_ihl >> 4) == 4) {
231 iph->hdr_checksum = 0;
232 iph->hdr_checksum = rte_ipv4_cksum(iph);
233 ip_len = iph->total_length;
234 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
237 ip6h = (struct ipv6_hdr *)iph;
238 ip_paylen = ip6h->payload_len;
241 /* calculate the new phdr checksum not including ip_paylen */
242 prev_cksum = th->cksum;
245 tmp = (tmp & 0xffff) + (tmp >> 16);
248 /* replace it in the packet */
249 th->cksum = new_cksum;
254 tx_offload_enabled(struct virtio_hw *hw)
256 return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
257 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
258 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
261 /* avoid write operation when necessary, to lessen cache issues */
262 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
263 if ((var) != (val)) \
268 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
269 uint16_t needed, int use_indirect, int can_push)
271 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
272 struct vq_desc_extra *dxp;
273 struct virtqueue *vq = txvq->vq;
274 struct vring_desc *start_dp;
275 uint16_t seg_num = cookie->nb_segs;
276 uint16_t head_idx, idx;
277 uint16_t head_size = vq->hw->vtnet_hdr_size;
278 struct virtio_net_hdr *hdr;
281 offload = tx_offload_enabled(vq->hw);
282 head_idx = vq->vq_desc_head_idx;
284 dxp = &vq->vq_descx[idx];
285 dxp->cookie = (void *)cookie;
286 dxp->ndescs = needed;
288 start_dp = vq->vq_ring.desc;
291 /* prepend cannot fail, checked by caller */
292 hdr = (struct virtio_net_hdr *)
293 rte_pktmbuf_prepend(cookie, head_size);
294 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
295 * which is wrong. Below subtract restores correct pkt size.
297 cookie->pkt_len -= head_size;
298 /* if offload disabled, it is not zeroed below, do it now */
300 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
301 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
302 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
303 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
304 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
305 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
307 } else if (use_indirect) {
308 /* setup tx ring slot to point to indirect
309 * descriptor list stored in reserved region.
311 * the first slot in indirect ring is already preset
312 * to point to the header in reserved region
314 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
315 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
316 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
317 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
318 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
320 /* loop below will fill in rest of the indirect elements */
321 start_dp = txr[idx].tx_indir;
324 /* setup first tx ring slot to point to header
325 * stored in reserved region.
327 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
328 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
329 start_dp[idx].len = vq->hw->vtnet_hdr_size;
330 start_dp[idx].flags = VRING_DESC_F_NEXT;
331 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
333 idx = start_dp[idx].next;
336 /* Checksum Offload / TSO */
338 if (cookie->ol_flags & PKT_TX_TCP_SEG)
339 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
341 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
342 case PKT_TX_UDP_CKSUM:
343 hdr->csum_start = cookie->l2_len + cookie->l3_len;
344 hdr->csum_offset = offsetof(struct udp_hdr,
346 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
349 case PKT_TX_TCP_CKSUM:
350 hdr->csum_start = cookie->l2_len + cookie->l3_len;
351 hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
352 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
356 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
357 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
358 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
362 /* TCP Segmentation Offload */
363 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
364 virtio_tso_fix_cksum(cookie);
365 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
366 VIRTIO_NET_HDR_GSO_TCPV6 :
367 VIRTIO_NET_HDR_GSO_TCPV4;
368 hdr->gso_size = cookie->tso_segsz;
374 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
375 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
376 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
381 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
382 start_dp[idx].len = cookie->data_len;
383 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
384 idx = start_dp[idx].next;
385 } while ((cookie = cookie->next) != NULL);
388 idx = vq->vq_ring.desc[head_idx].next;
390 vq->vq_desc_head_idx = idx;
391 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
392 vq->vq_desc_tail_idx = idx;
393 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
394 vq_update_avail_ring(vq, head_idx);
398 virtio_dev_cq_start(struct rte_eth_dev *dev)
400 struct virtio_hw *hw = dev->data->dev_private;
402 if (hw->cvq && hw->cvq->vq) {
403 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
408 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
411 unsigned int socket_id __rte_unused,
412 __rte_unused const struct rte_eth_rxconf *rx_conf,
413 struct rte_mempool *mp)
415 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
416 struct virtio_hw *hw = dev->data->dev_private;
417 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
418 struct virtnet_rx *rxvq;
420 PMD_INIT_FUNC_TRACE();
422 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
423 nb_desc = vq->vq_nentries;
424 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
427 rxvq->queue_id = queue_idx;
429 if (rxvq->mpool == NULL) {
430 rte_exit(EXIT_FAILURE,
431 "Cannot allocate mbufs for rx virtqueue");
433 dev->data->rx_queues[queue_idx] = rxvq;
439 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
441 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
442 struct virtio_hw *hw = dev->data->dev_private;
443 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
444 struct virtnet_rx *rxvq = &vq->rxq;
449 PMD_INIT_FUNC_TRACE();
451 /* Allocate blank mbufs for the each rx descriptor */
454 if (hw->use_simple_rxtx) {
455 for (desc_idx = 0; desc_idx < vq->vq_nentries;
457 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
458 vq->vq_ring.desc[desc_idx].flags =
463 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
464 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
466 vq->sw_ring[vq->vq_nentries + desc_idx] =
470 while (!virtqueue_full(vq)) {
471 m = rte_mbuf_raw_alloc(rxvq->mpool);
475 /* Enqueue allocated buffers */
476 if (hw->use_simple_rxtx)
477 error = virtqueue_enqueue_recv_refill_simple(vq, m);
479 error = virtqueue_enqueue_recv_refill(vq, m);
488 vq_update_avail_idx(vq);
490 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
492 virtio_rxq_vec_setup(rxvq);
500 virtio_update_rxtx_handler(struct rte_eth_dev *dev,
501 const struct rte_eth_txconf *tx_conf)
503 uint8_t use_simple_rxtx = 0;
504 struct virtio_hw *hw = dev->data->dev_private;
506 #if defined RTE_ARCH_X86
507 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE3))
509 #elif defined RTE_ARCH_ARM64 || defined CONFIG_RTE_ARCH_ARM
510 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))
513 /* Use simple rx/tx func if single segment and no offloads */
514 if (use_simple_rxtx &&
515 (tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
516 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
517 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
518 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
519 dev->rx_pkt_burst = virtio_recv_pkts_vec;
520 hw->use_simple_rxtx = use_simple_rxtx;
525 * struct rte_eth_dev *dev: Used to update dev
526 * uint16_t nb_desc: Defaults to values read from config space
527 * unsigned int socket_id: Used to allocate memzone
528 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
529 * uint16_t queue_idx: Just used as an index in dev txq list
532 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
535 unsigned int socket_id __rte_unused,
536 const struct rte_eth_txconf *tx_conf)
538 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
539 struct virtio_hw *hw = dev->data->dev_private;
540 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
541 struct virtnet_tx *txvq;
542 uint16_t tx_free_thresh;
544 PMD_INIT_FUNC_TRACE();
546 virtio_update_rxtx_handler(dev, tx_conf);
548 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
549 nb_desc = vq->vq_nentries;
550 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
553 txvq->queue_id = queue_idx;
555 tx_free_thresh = tx_conf->tx_free_thresh;
556 if (tx_free_thresh == 0)
558 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
560 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
561 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
562 "number of TX entries minus 3 (%u)."
563 " (tx_free_thresh=%u port=%u queue=%u)\n",
565 tx_free_thresh, dev->data->port_id, queue_idx);
569 vq->vq_free_thresh = tx_free_thresh;
571 dev->data->tx_queues[queue_idx] = txvq;
576 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
579 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
580 struct virtio_hw *hw = dev->data->dev_private;
581 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
582 uint16_t mid_idx = vq->vq_nentries >> 1;
583 struct virtnet_tx *txvq = &vq->txq;
586 PMD_INIT_FUNC_TRACE();
588 if (hw->use_simple_rxtx) {
589 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
590 vq->vq_ring.avail->ring[desc_idx] =
592 vq->vq_ring.desc[desc_idx + mid_idx].next =
594 vq->vq_ring.desc[desc_idx + mid_idx].addr =
595 txvq->virtio_net_hdr_mem +
596 offsetof(struct virtio_tx_region, tx_hdr);
597 vq->vq_ring.desc[desc_idx + mid_idx].len =
598 vq->hw->vtnet_hdr_size;
599 vq->vq_ring.desc[desc_idx + mid_idx].flags =
601 vq->vq_ring.desc[desc_idx].flags = 0;
603 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
605 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
614 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
618 * Requeue the discarded mbuf. This should always be
619 * successful since it was just dequeued.
621 error = virtqueue_enqueue_recv_refill(vq, m);
622 if (unlikely(error)) {
623 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
629 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
631 uint32_t s = mbuf->pkt_len;
632 struct ether_addr *ea;
635 stats->size_bins[1]++;
636 } else if (s > 64 && s < 1024) {
639 /* count zeros, and offset into correct bin */
640 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
641 stats->size_bins[bin]++;
644 stats->size_bins[0]++;
646 stats->size_bins[6]++;
648 stats->size_bins[7]++;
651 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
652 if (is_multicast_ether_addr(ea)) {
653 if (is_broadcast_ether_addr(ea))
660 /* Optionally fill offload information in structure */
662 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
664 struct rte_net_hdr_lens hdr_lens;
665 uint32_t hdrlen, ptype;
666 int l4_supported = 0;
669 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
672 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
674 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
675 m->packet_type = ptype;
676 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
677 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
678 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
681 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
682 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
683 if (hdr->csum_start <= hdrlen && l4_supported) {
684 m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
686 /* Unknown proto or tunnel, do sw cksum. We can assume
687 * the cksum field is in the first segment since the
688 * buffers we provided to the host are large enough.
689 * In case of SCTP, this will be wrong since it's a CRC
690 * but there's nothing we can do.
692 uint16_t csum = 0, off;
694 rte_raw_cksum_mbuf(m, hdr->csum_start,
695 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
697 if (likely(csum != 0xffff))
699 off = hdr->csum_offset + hdr->csum_start;
700 if (rte_pktmbuf_data_len(m) >= off + 1)
701 *rte_pktmbuf_mtod_offset(m, uint16_t *,
704 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
705 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
708 /* GSO request, save required information in mbuf */
709 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
710 /* Check unsupported modes */
711 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
712 (hdr->gso_size == 0)) {
716 /* Update mss lengthes in mbuf */
717 m->tso_segsz = hdr->gso_size;
718 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
719 case VIRTIO_NET_HDR_GSO_TCPV4:
720 case VIRTIO_NET_HDR_GSO_TCPV6:
721 m->ol_flags |= PKT_RX_LRO | \
722 PKT_RX_L4_CKSUM_NONE;
733 rx_offload_enabled(struct virtio_hw *hw)
735 return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
736 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
737 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
740 #define VIRTIO_MBUF_BURST_SZ 64
741 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
743 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
745 struct virtnet_rx *rxvq = rx_queue;
746 struct virtqueue *vq = rxvq->vq;
747 struct virtio_hw *hw;
748 struct rte_mbuf *rxm, *new_mbuf;
749 uint16_t nb_used, num, nb_rx;
750 uint32_t len[VIRTIO_MBUF_BURST_SZ];
751 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
753 uint32_t i, nb_enqueued;
756 struct virtio_net_hdr *hdr;
758 nb_used = VIRTQUEUE_NUSED(vq);
762 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
763 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
764 if (likely(num > DESC_PER_CACHELINE))
765 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
767 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
768 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
773 hdr_size = hw->vtnet_hdr_size;
774 offload = rx_offload_enabled(hw);
776 for (i = 0; i < num ; i++) {
779 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
781 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
782 PMD_RX_LOG(ERR, "Packet drop");
784 virtio_discard_rxbuf(vq, rxm);
785 rxvq->stats.errors++;
789 rxm->port = rxvq->port_id;
790 rxm->data_off = RTE_PKTMBUF_HEADROOM;
796 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
797 rxm->data_len = (uint16_t)(len[i] - hdr_size);
799 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
800 RTE_PKTMBUF_HEADROOM - hdr_size);
805 if (offload && virtio_rx_offload(rxm, hdr) < 0) {
806 virtio_discard_rxbuf(vq, rxm);
807 rxvq->stats.errors++;
811 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
813 rx_pkts[nb_rx++] = rxm;
815 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len;
816 virtio_update_packet_stats(&rxvq->stats, rxm);
819 rxvq->stats.packets += nb_rx;
821 /* Allocate new mbuf for the used descriptor */
823 while (likely(!virtqueue_full(vq))) {
824 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
825 if (unlikely(new_mbuf == NULL)) {
826 struct rte_eth_dev *dev
827 = &rte_eth_devices[rxvq->port_id];
828 dev->data->rx_mbuf_alloc_failed++;
831 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
832 if (unlikely(error)) {
833 rte_pktmbuf_free(new_mbuf);
839 if (likely(nb_enqueued)) {
840 vq_update_avail_idx(vq);
842 if (unlikely(virtqueue_kick_prepare(vq))) {
843 virtqueue_notify(vq);
844 PMD_RX_LOG(DEBUG, "Notified");
852 virtio_recv_mergeable_pkts(void *rx_queue,
853 struct rte_mbuf **rx_pkts,
856 struct virtnet_rx *rxvq = rx_queue;
857 struct virtqueue *vq = rxvq->vq;
858 struct virtio_hw *hw;
859 struct rte_mbuf *rxm, *new_mbuf;
860 uint16_t nb_used, num, nb_rx;
861 uint32_t len[VIRTIO_MBUF_BURST_SZ];
862 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
863 struct rte_mbuf *prev;
865 uint32_t i, nb_enqueued;
872 nb_used = VIRTQUEUE_NUSED(vq);
876 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
885 hdr_size = hw->vtnet_hdr_size;
886 offload = rx_offload_enabled(hw);
888 while (i < nb_used) {
889 struct virtio_net_hdr_mrg_rxbuf *header;
891 if (nb_rx == nb_pkts)
894 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
900 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
901 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
905 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
906 PMD_RX_LOG(ERR, "Packet drop");
908 virtio_discard_rxbuf(vq, rxm);
909 rxvq->stats.errors++;
913 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
914 RTE_PKTMBUF_HEADROOM - hdr_size);
915 seg_num = header->num_buffers;
920 rxm->data_off = RTE_PKTMBUF_HEADROOM;
921 rxm->nb_segs = seg_num;
925 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
926 rxm->data_len = (uint16_t)(len[0] - hdr_size);
928 rxm->port = rxvq->port_id;
929 rx_pkts[nb_rx] = rxm;
932 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
933 virtio_discard_rxbuf(vq, rxm);
934 rxvq->stats.errors++;
938 seg_res = seg_num - 1;
940 while (seg_res != 0) {
942 * Get extra segments for current uncompleted packet.
945 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
946 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
948 virtqueue_dequeue_burst_rx(vq,
949 rcv_pkts, len, rcv_cnt);
954 "No enough segments for packet.");
956 virtio_discard_rxbuf(vq, rxm);
957 rxvq->stats.errors++;
963 while (extra_idx < rcv_cnt) {
964 rxm = rcv_pkts[extra_idx];
966 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
968 rxm->pkt_len = (uint32_t)(len[extra_idx]);
969 rxm->data_len = (uint16_t)(len[extra_idx]);
975 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
982 rte_vlan_strip(rx_pkts[nb_rx]);
984 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
985 rx_pkts[nb_rx]->data_len);
987 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
988 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
992 rxvq->stats.packets += nb_rx;
994 /* Allocate new mbuf for the used descriptor */
996 while (likely(!virtqueue_full(vq))) {
997 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
998 if (unlikely(new_mbuf == NULL)) {
999 struct rte_eth_dev *dev
1000 = &rte_eth_devices[rxvq->port_id];
1001 dev->data->rx_mbuf_alloc_failed++;
1004 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
1005 if (unlikely(error)) {
1006 rte_pktmbuf_free(new_mbuf);
1012 if (likely(nb_enqueued)) {
1013 vq_update_avail_idx(vq);
1015 if (unlikely(virtqueue_kick_prepare(vq))) {
1016 virtqueue_notify(vq);
1017 PMD_RX_LOG(DEBUG, "Notified");
1025 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1027 struct virtnet_tx *txvq = tx_queue;
1028 struct virtqueue *vq = txvq->vq;
1029 struct virtio_hw *hw = vq->hw;
1030 uint16_t hdr_size = hw->vtnet_hdr_size;
1031 uint16_t nb_used, nb_tx;
1034 if (unlikely(nb_pkts < 1))
1037 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1038 nb_used = VIRTQUEUE_NUSED(vq);
1041 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1042 virtio_xmit_cleanup(vq, nb_used);
1044 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1045 struct rte_mbuf *txm = tx_pkts[nb_tx];
1046 int can_push = 0, use_indirect = 0, slots, need;
1048 /* Do VLAN tag insertion */
1049 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1050 error = rte_vlan_insert(&txm);
1051 if (unlikely(error)) {
1052 rte_pktmbuf_free(txm);
1057 /* optimize ring usage */
1058 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
1059 rte_mbuf_refcnt_read(txm) == 1 &&
1060 RTE_MBUF_DIRECT(txm) &&
1061 txm->nb_segs == 1 &&
1062 rte_pktmbuf_headroom(txm) >= hdr_size &&
1063 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1064 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1066 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1067 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1070 /* How many main ring entries are needed to this Tx?
1071 * any_layout => number of segments
1073 * default => number of segments + 1
1075 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1076 need = slots - vq->vq_free_cnt;
1078 /* Positive value indicates it need free vring descriptors */
1079 if (unlikely(need > 0)) {
1080 nb_used = VIRTQUEUE_NUSED(vq);
1082 need = RTE_MIN(need, (int)nb_used);
1084 virtio_xmit_cleanup(vq, need);
1085 need = slots - vq->vq_free_cnt;
1086 if (unlikely(need > 0)) {
1088 "No free tx descriptors to transmit");
1093 /* Enqueue Packet buffers */
1094 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
1096 txvq->stats.bytes += txm->pkt_len;
1097 virtio_update_packet_stats(&txvq->stats, txm);
1100 txvq->stats.packets += nb_tx;
1102 if (likely(nb_tx)) {
1103 vq_update_avail_idx(vq);
1105 if (unlikely(virtqueue_kick_prepare(vq))) {
1106 virtqueue_notify(vq);
1107 PMD_TX_LOG(DEBUG, "Notified backend after xmit");