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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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>
58 #include "virtio_logs.h"
59 #include "virtio_ethdev.h"
60 #include "virtio_pci.h"
61 #include "virtqueue.h"
62 #include "virtio_rxtx.h"
64 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
65 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
67 #define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
71 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
72 ETH_TXQ_FLAGS_NOOFFLOADS)
75 virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
77 struct virtnet_rx *rxvq = rxq;
78 struct virtqueue *vq = rxvq->vq;
80 return VIRTQUEUE_NUSED(vq) >= offset;
84 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
86 struct vring_desc *dp, *dp_tail;
87 struct vq_desc_extra *dxp;
88 uint16_t desc_idx_last = desc_idx;
90 dp = &vq->vq_ring.desc[desc_idx];
91 dxp = &vq->vq_descx[desc_idx];
92 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
93 if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
94 while (dp->flags & VRING_DESC_F_NEXT) {
95 desc_idx_last = dp->next;
96 dp = &vq->vq_ring.desc[dp->next];
102 * We must append the existing free chain, if any, to the end of
103 * newly freed chain. If the virtqueue was completely used, then
104 * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
106 if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
107 vq->vq_desc_head_idx = desc_idx;
109 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
110 dp_tail->next = desc_idx;
113 vq->vq_desc_tail_idx = desc_idx_last;
114 dp->next = VQ_RING_DESC_CHAIN_END;
118 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
119 uint32_t *len, uint16_t num)
121 struct vring_used_elem *uep;
122 struct rte_mbuf *cookie;
123 uint16_t used_idx, desc_idx;
126 /* Caller does the check */
127 for (i = 0; i < num ; i++) {
128 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
129 uep = &vq->vq_ring.used->ring[used_idx];
130 desc_idx = (uint16_t) uep->id;
132 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
134 if (unlikely(cookie == NULL)) {
135 PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
136 vq->vq_used_cons_idx);
140 rte_prefetch0(cookie);
141 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
143 vq->vq_used_cons_idx++;
144 vq_ring_free_chain(vq, desc_idx);
145 vq->vq_descx[desc_idx].cookie = NULL;
151 #ifndef DEFAULT_TX_FREE_THRESH
152 #define DEFAULT_TX_FREE_THRESH 32
155 /* Cleanup from completed transmits. */
157 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
159 uint16_t i, used_idx, desc_idx;
160 for (i = 0; i < num; i++) {
161 struct vring_used_elem *uep;
162 struct vq_desc_extra *dxp;
164 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
165 uep = &vq->vq_ring.used->ring[used_idx];
167 desc_idx = (uint16_t) uep->id;
168 dxp = &vq->vq_descx[desc_idx];
169 vq->vq_used_cons_idx++;
170 vq_ring_free_chain(vq, desc_idx);
172 if (dxp->cookie != NULL) {
173 rte_pktmbuf_free(dxp->cookie);
181 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
183 struct vq_desc_extra *dxp;
184 struct virtio_hw *hw = vq->hw;
185 struct vring_desc *start_dp;
187 uint16_t head_idx, idx;
189 if (unlikely(vq->vq_free_cnt == 0))
191 if (unlikely(vq->vq_free_cnt < needed))
194 head_idx = vq->vq_desc_head_idx;
195 if (unlikely(head_idx >= vq->vq_nentries))
199 dxp = &vq->vq_descx[idx];
200 dxp->cookie = (void *)cookie;
201 dxp->ndescs = needed;
203 start_dp = vq->vq_ring.desc;
205 VIRTIO_MBUF_ADDR(cookie, vq) +
206 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
208 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
209 start_dp[idx].flags = VRING_DESC_F_WRITE;
210 idx = start_dp[idx].next;
211 vq->vq_desc_head_idx = idx;
212 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
213 vq->vq_desc_tail_idx = idx;
214 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
215 vq_update_avail_ring(vq, head_idx);
220 /* When doing TSO, the IP length is not included in the pseudo header
221 * checksum of the packet given to the PMD, but for virtio it is
225 virtio_tso_fix_cksum(struct rte_mbuf *m)
227 /* common case: header is not fragmented */
228 if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
230 struct ipv4_hdr *iph;
231 struct ipv6_hdr *ip6h;
233 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
236 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
237 th = RTE_PTR_ADD(iph, m->l3_len);
238 if ((iph->version_ihl >> 4) == 4) {
239 iph->hdr_checksum = 0;
240 iph->hdr_checksum = rte_ipv4_cksum(iph);
241 ip_len = iph->total_length;
242 ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
245 ip6h = (struct ipv6_hdr *)iph;
246 ip_paylen = ip6h->payload_len;
249 /* calculate the new phdr checksum not including ip_paylen */
250 prev_cksum = th->cksum;
253 tmp = (tmp & 0xffff) + (tmp >> 16);
256 /* replace it in the packet */
257 th->cksum = new_cksum;
262 tx_offload_enabled(struct virtio_hw *hw)
264 return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
265 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
266 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
269 /* avoid write operation when necessary, to lessen cache issues */
270 #define ASSIGN_UNLESS_EQUAL(var, val) do { \
271 if ((var) != (val)) \
276 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
277 uint16_t needed, int use_indirect, int can_push)
279 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
280 struct vq_desc_extra *dxp;
281 struct virtqueue *vq = txvq->vq;
282 struct vring_desc *start_dp;
283 uint16_t seg_num = cookie->nb_segs;
284 uint16_t head_idx, idx;
285 uint16_t head_size = vq->hw->vtnet_hdr_size;
286 struct virtio_net_hdr *hdr;
289 offload = tx_offload_enabled(vq->hw);
290 head_idx = vq->vq_desc_head_idx;
292 dxp = &vq->vq_descx[idx];
293 dxp->cookie = (void *)cookie;
294 dxp->ndescs = needed;
296 start_dp = vq->vq_ring.desc;
299 /* prepend cannot fail, checked by caller */
300 hdr = (struct virtio_net_hdr *)
301 rte_pktmbuf_prepend(cookie, head_size);
302 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
303 * which is wrong. Below subtract restores correct pkt size.
305 cookie->pkt_len -= head_size;
306 /* if offload disabled, it is not zeroed below, do it now */
308 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
309 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
310 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
311 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
312 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
313 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
315 } else if (use_indirect) {
316 /* setup tx ring slot to point to indirect
317 * descriptor list stored in reserved region.
319 * the first slot in indirect ring is already preset
320 * to point to the header in reserved region
322 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
323 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
324 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
325 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
326 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
328 /* loop below will fill in rest of the indirect elements */
329 start_dp = txr[idx].tx_indir;
332 /* setup first tx ring slot to point to header
333 * stored in reserved region.
335 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
336 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
337 start_dp[idx].len = vq->hw->vtnet_hdr_size;
338 start_dp[idx].flags = VRING_DESC_F_NEXT;
339 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
341 idx = start_dp[idx].next;
344 /* Checksum Offload / TSO */
346 if (cookie->ol_flags & PKT_TX_TCP_SEG)
347 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
349 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
350 case PKT_TX_UDP_CKSUM:
351 hdr->csum_start = cookie->l2_len + cookie->l3_len;
352 hdr->csum_offset = offsetof(struct udp_hdr,
354 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
357 case PKT_TX_TCP_CKSUM:
358 hdr->csum_start = cookie->l2_len + cookie->l3_len;
359 hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
360 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
364 ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
365 ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
366 ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
370 /* TCP Segmentation Offload */
371 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
372 virtio_tso_fix_cksum(cookie);
373 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
374 VIRTIO_NET_HDR_GSO_TCPV6 :
375 VIRTIO_NET_HDR_GSO_TCPV4;
376 hdr->gso_size = cookie->tso_segsz;
382 ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
383 ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
384 ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
389 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
390 start_dp[idx].len = cookie->data_len;
391 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
392 idx = start_dp[idx].next;
393 } while ((cookie = cookie->next) != NULL);
396 idx = vq->vq_ring.desc[head_idx].next;
398 vq->vq_desc_head_idx = idx;
399 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
400 vq->vq_desc_tail_idx = idx;
401 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
402 vq_update_avail_ring(vq, head_idx);
406 virtio_dev_cq_start(struct rte_eth_dev *dev)
408 struct virtio_hw *hw = dev->data->dev_private;
410 if (hw->cvq && hw->cvq->vq) {
411 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
416 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
419 unsigned int socket_id __rte_unused,
420 __rte_unused const struct rte_eth_rxconf *rx_conf,
421 struct rte_mempool *mp)
423 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
424 struct virtio_hw *hw = dev->data->dev_private;
425 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
426 struct virtnet_rx *rxvq;
428 PMD_INIT_FUNC_TRACE();
430 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
431 nb_desc = vq->vq_nentries;
432 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
435 rxvq->queue_id = queue_idx;
437 if (rxvq->mpool == NULL) {
438 rte_exit(EXIT_FAILURE,
439 "Cannot allocate mbufs for rx virtqueue");
441 dev->data->rx_queues[queue_idx] = rxvq;
447 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
449 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
450 struct virtio_hw *hw = dev->data->dev_private;
451 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
452 struct virtnet_rx *rxvq = &vq->rxq;
457 PMD_INIT_FUNC_TRACE();
459 /* Allocate blank mbufs for the each rx descriptor */
462 if (hw->use_simple_rx) {
463 for (desc_idx = 0; desc_idx < vq->vq_nentries;
465 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
466 vq->vq_ring.desc[desc_idx].flags =
471 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
472 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
474 vq->sw_ring[vq->vq_nentries + desc_idx] =
478 while (!virtqueue_full(vq)) {
479 m = rte_mbuf_raw_alloc(rxvq->mpool);
483 /* Enqueue allocated buffers */
484 if (hw->use_simple_rx)
485 error = virtqueue_enqueue_recv_refill_simple(vq, m);
487 error = virtqueue_enqueue_recv_refill(vq, m);
496 vq_update_avail_idx(vq);
498 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
500 virtio_rxq_vec_setup(rxvq);
508 * struct rte_eth_dev *dev: Used to update dev
509 * uint16_t nb_desc: Defaults to values read from config space
510 * unsigned int socket_id: Used to allocate memzone
511 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
512 * uint16_t queue_idx: Just used as an index in dev txq list
515 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
518 unsigned int socket_id __rte_unused,
519 const struct rte_eth_txconf *tx_conf)
521 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
522 struct virtio_hw *hw = dev->data->dev_private;
523 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
524 struct virtnet_tx *txvq;
525 uint16_t tx_free_thresh;
527 PMD_INIT_FUNC_TRACE();
529 /* cannot use simple rxtx funcs with multisegs or offloads */
530 if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) != VIRTIO_SIMPLE_FLAGS)
531 hw->use_simple_tx = 0;
533 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
534 nb_desc = vq->vq_nentries;
535 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
538 txvq->queue_id = queue_idx;
540 tx_free_thresh = tx_conf->tx_free_thresh;
541 if (tx_free_thresh == 0)
543 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
545 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
546 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
547 "number of TX entries minus 3 (%u)."
548 " (tx_free_thresh=%u port=%u queue=%u)\n",
550 tx_free_thresh, dev->data->port_id, queue_idx);
554 vq->vq_free_thresh = tx_free_thresh;
556 dev->data->tx_queues[queue_idx] = txvq;
561 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
564 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
565 struct virtio_hw *hw = dev->data->dev_private;
566 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
567 uint16_t mid_idx = vq->vq_nentries >> 1;
568 struct virtnet_tx *txvq = &vq->txq;
571 PMD_INIT_FUNC_TRACE();
573 if (hw->use_simple_tx) {
574 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
575 vq->vq_ring.avail->ring[desc_idx] =
577 vq->vq_ring.desc[desc_idx + mid_idx].next =
579 vq->vq_ring.desc[desc_idx + mid_idx].addr =
580 txvq->virtio_net_hdr_mem +
581 offsetof(struct virtio_tx_region, tx_hdr);
582 vq->vq_ring.desc[desc_idx + mid_idx].len =
583 vq->hw->vtnet_hdr_size;
584 vq->vq_ring.desc[desc_idx + mid_idx].flags =
586 vq->vq_ring.desc[desc_idx].flags = 0;
588 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
590 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
599 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
603 * Requeue the discarded mbuf. This should always be
604 * successful since it was just dequeued.
606 error = virtqueue_enqueue_recv_refill(vq, m);
607 if (unlikely(error)) {
608 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
614 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
616 uint32_t s = mbuf->pkt_len;
617 struct ether_addr *ea;
620 stats->size_bins[1]++;
621 } else if (s > 64 && s < 1024) {
624 /* count zeros, and offset into correct bin */
625 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
626 stats->size_bins[bin]++;
629 stats->size_bins[0]++;
631 stats->size_bins[6]++;
633 stats->size_bins[7]++;
636 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
637 if (is_multicast_ether_addr(ea)) {
638 if (is_broadcast_ether_addr(ea))
645 /* Optionally fill offload information in structure */
647 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
649 struct rte_net_hdr_lens hdr_lens;
650 uint32_t hdrlen, ptype;
651 int l4_supported = 0;
654 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
657 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
659 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
660 m->packet_type = ptype;
661 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
662 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
663 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
666 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
667 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
668 if (hdr->csum_start <= hdrlen && l4_supported) {
669 m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
671 /* Unknown proto or tunnel, do sw cksum. We can assume
672 * the cksum field is in the first segment since the
673 * buffers we provided to the host are large enough.
674 * In case of SCTP, this will be wrong since it's a CRC
675 * but there's nothing we can do.
677 uint16_t csum = 0, off;
679 rte_raw_cksum_mbuf(m, hdr->csum_start,
680 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
682 if (likely(csum != 0xffff))
684 off = hdr->csum_offset + hdr->csum_start;
685 if (rte_pktmbuf_data_len(m) >= off + 1)
686 *rte_pktmbuf_mtod_offset(m, uint16_t *,
689 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
690 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
693 /* GSO request, save required information in mbuf */
694 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
695 /* Check unsupported modes */
696 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
697 (hdr->gso_size == 0)) {
701 /* Update mss lengthes in mbuf */
702 m->tso_segsz = hdr->gso_size;
703 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
704 case VIRTIO_NET_HDR_GSO_TCPV4:
705 case VIRTIO_NET_HDR_GSO_TCPV6:
706 m->ol_flags |= PKT_RX_LRO | \
707 PKT_RX_L4_CKSUM_NONE;
718 rx_offload_enabled(struct virtio_hw *hw)
720 return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
721 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
722 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
725 #define VIRTIO_MBUF_BURST_SZ 64
726 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
728 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
730 struct virtnet_rx *rxvq = rx_queue;
731 struct virtqueue *vq = rxvq->vq;
732 struct virtio_hw *hw = vq->hw;
733 struct rte_mbuf *rxm, *new_mbuf;
734 uint16_t nb_used, num, nb_rx;
735 uint32_t len[VIRTIO_MBUF_BURST_SZ];
736 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
738 uint32_t i, nb_enqueued;
741 struct virtio_net_hdr *hdr;
744 if (unlikely(hw->started == 0))
747 nb_used = VIRTQUEUE_NUSED(vq);
751 num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
752 if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
753 num = VIRTIO_MBUF_BURST_SZ;
754 if (likely(num > DESC_PER_CACHELINE))
755 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
757 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
758 PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
761 hdr_size = hw->vtnet_hdr_size;
762 offload = rx_offload_enabled(hw);
764 for (i = 0; i < num ; i++) {
767 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
769 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
770 PMD_RX_LOG(ERR, "Packet drop");
772 virtio_discard_rxbuf(vq, rxm);
773 rxvq->stats.errors++;
777 rxm->port = rxvq->port_id;
778 rxm->data_off = RTE_PKTMBUF_HEADROOM;
782 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
783 rxm->data_len = (uint16_t)(len[i] - hdr_size);
785 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
786 RTE_PKTMBUF_HEADROOM - hdr_size);
791 if (offload && virtio_rx_offload(rxm, hdr) < 0) {
792 virtio_discard_rxbuf(vq, rxm);
793 rxvq->stats.errors++;
797 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
799 rx_pkts[nb_rx++] = rxm;
801 rxvq->stats.bytes += rxm->pkt_len;
802 virtio_update_packet_stats(&rxvq->stats, rxm);
805 rxvq->stats.packets += nb_rx;
807 /* Allocate new mbuf for the used descriptor */
809 while (likely(!virtqueue_full(vq))) {
810 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
811 if (unlikely(new_mbuf == NULL)) {
812 struct rte_eth_dev *dev
813 = &rte_eth_devices[rxvq->port_id];
814 dev->data->rx_mbuf_alloc_failed++;
817 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
818 if (unlikely(error)) {
819 rte_pktmbuf_free(new_mbuf);
825 if (likely(nb_enqueued)) {
826 vq_update_avail_idx(vq);
828 if (unlikely(virtqueue_kick_prepare(vq))) {
829 virtqueue_notify(vq);
830 PMD_RX_LOG(DEBUG, "Notified");
838 virtio_recv_mergeable_pkts(void *rx_queue,
839 struct rte_mbuf **rx_pkts,
842 struct virtnet_rx *rxvq = rx_queue;
843 struct virtqueue *vq = rxvq->vq;
844 struct virtio_hw *hw = vq->hw;
845 struct rte_mbuf *rxm, *new_mbuf;
846 uint16_t nb_used, num, nb_rx;
847 uint32_t len[VIRTIO_MBUF_BURST_SZ];
848 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
849 struct rte_mbuf *prev;
851 uint32_t i, nb_enqueued;
859 if (unlikely(hw->started == 0))
862 nb_used = VIRTQUEUE_NUSED(vq);
866 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
873 hdr_size = hw->vtnet_hdr_size;
874 offload = rx_offload_enabled(hw);
876 while (i < nb_used) {
877 struct virtio_net_hdr_mrg_rxbuf *header;
879 if (nb_rx == nb_pkts)
882 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
888 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
889 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
893 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
894 PMD_RX_LOG(ERR, "Packet drop");
896 virtio_discard_rxbuf(vq, rxm);
897 rxvq->stats.errors++;
901 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
902 RTE_PKTMBUF_HEADROOM - hdr_size);
903 seg_num = header->num_buffers;
908 rxm->data_off = RTE_PKTMBUF_HEADROOM;
909 rxm->nb_segs = seg_num;
912 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
913 rxm->data_len = (uint16_t)(len[0] - hdr_size);
915 rxm->port = rxvq->port_id;
916 rx_pkts[nb_rx] = rxm;
919 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
920 virtio_discard_rxbuf(vq, rxm);
921 rxvq->stats.errors++;
925 seg_res = seg_num - 1;
927 while (seg_res != 0) {
929 * Get extra segments for current uncompleted packet.
932 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
933 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
935 virtqueue_dequeue_burst_rx(vq,
936 rcv_pkts, len, rcv_cnt);
941 "No enough segments for packet.");
943 virtio_discard_rxbuf(vq, rxm);
944 rxvq->stats.errors++;
950 while (extra_idx < rcv_cnt) {
951 rxm = rcv_pkts[extra_idx];
953 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
954 rxm->pkt_len = (uint32_t)(len[extra_idx]);
955 rxm->data_len = (uint16_t)(len[extra_idx]);
961 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
968 rte_vlan_strip(rx_pkts[nb_rx]);
970 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
971 rx_pkts[nb_rx]->data_len);
973 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
974 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
978 rxvq->stats.packets += nb_rx;
980 /* Allocate new mbuf for the used descriptor */
982 while (likely(!virtqueue_full(vq))) {
983 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
984 if (unlikely(new_mbuf == NULL)) {
985 struct rte_eth_dev *dev
986 = &rte_eth_devices[rxvq->port_id];
987 dev->data->rx_mbuf_alloc_failed++;
990 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
991 if (unlikely(error)) {
992 rte_pktmbuf_free(new_mbuf);
998 if (likely(nb_enqueued)) {
999 vq_update_avail_idx(vq);
1001 if (unlikely(virtqueue_kick_prepare(vq))) {
1002 virtqueue_notify(vq);
1003 PMD_RX_LOG(DEBUG, "Notified");
1011 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1013 struct virtnet_tx *txvq = tx_queue;
1014 struct virtqueue *vq = txvq->vq;
1015 struct virtio_hw *hw = vq->hw;
1016 uint16_t hdr_size = hw->vtnet_hdr_size;
1017 uint16_t nb_used, nb_tx = 0;
1020 if (unlikely(hw->started == 0))
1023 if (unlikely(nb_pkts < 1))
1026 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1027 nb_used = VIRTQUEUE_NUSED(vq);
1030 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1031 virtio_xmit_cleanup(vq, nb_used);
1033 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1034 struct rte_mbuf *txm = tx_pkts[nb_tx];
1035 int can_push = 0, use_indirect = 0, slots, need;
1037 /* Do VLAN tag insertion */
1038 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1039 error = rte_vlan_insert(&txm);
1040 if (unlikely(error)) {
1041 rte_pktmbuf_free(txm);
1046 /* optimize ring usage */
1047 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1048 vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1049 rte_mbuf_refcnt_read(txm) == 1 &&
1050 RTE_MBUF_DIRECT(txm) &&
1051 txm->nb_segs == 1 &&
1052 rte_pktmbuf_headroom(txm) >= hdr_size &&
1053 rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1054 __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1056 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1057 txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1060 /* How many main ring entries are needed to this Tx?
1061 * any_layout => number of segments
1063 * default => number of segments + 1
1065 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1066 need = slots - vq->vq_free_cnt;
1068 /* Positive value indicates it need free vring descriptors */
1069 if (unlikely(need > 0)) {
1070 nb_used = VIRTQUEUE_NUSED(vq);
1072 need = RTE_MIN(need, (int)nb_used);
1074 virtio_xmit_cleanup(vq, need);
1075 need = slots - vq->vq_free_cnt;
1076 if (unlikely(need > 0)) {
1078 "No free tx descriptors to transmit");
1083 /* Enqueue Packet buffers */
1084 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
1086 txvq->stats.bytes += txm->pkt_len;
1087 virtio_update_packet_stats(&txvq->stats, txm);
1090 txvq->stats.packets += nb_tx;
1092 if (likely(nb_tx)) {
1093 vq_update_avail_idx(vq);
1095 if (unlikely(virtqueue_kick_prepare(vq))) {
1096 virtqueue_notify(vq);
1097 PMD_TX_LOG(DEBUG, "Notified backend after xmit");