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);
262 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
263 uint16_t needed, int use_indirect, int can_push)
265 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
266 struct vq_desc_extra *dxp;
267 struct virtqueue *vq = txvq->vq;
268 struct vring_desc *start_dp;
269 uint16_t seg_num = cookie->nb_segs;
270 uint16_t head_idx, idx;
271 uint16_t head_size = vq->hw->vtnet_hdr_size;
272 struct virtio_net_hdr *hdr;
275 offload = tx_offload_enabled(vq->hw);
276 head_idx = vq->vq_desc_head_idx;
278 dxp = &vq->vq_descx[idx];
279 dxp->cookie = (void *)cookie;
280 dxp->ndescs = needed;
282 start_dp = vq->vq_ring.desc;
285 /* prepend cannot fail, checked by caller */
286 hdr = (struct virtio_net_hdr *)
287 rte_pktmbuf_prepend(cookie, head_size);
288 /* if offload disabled, it is not zeroed below, do it now */
290 memset(hdr, 0, head_size);
291 } else if (use_indirect) {
292 /* setup tx ring slot to point to indirect
293 * descriptor list stored in reserved region.
295 * the first slot in indirect ring is already preset
296 * to point to the header in reserved region
298 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
299 RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
300 start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
301 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
302 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
304 /* loop below will fill in rest of the indirect elements */
305 start_dp = txr[idx].tx_indir;
308 /* setup first tx ring slot to point to header
309 * stored in reserved region.
311 start_dp[idx].addr = txvq->virtio_net_hdr_mem +
312 RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
313 start_dp[idx].len = vq->hw->vtnet_hdr_size;
314 start_dp[idx].flags = VRING_DESC_F_NEXT;
315 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
317 idx = start_dp[idx].next;
320 /* Checksum Offload / TSO */
322 if (cookie->ol_flags & PKT_TX_TCP_SEG)
323 cookie->ol_flags |= PKT_TX_TCP_CKSUM;
325 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
326 case PKT_TX_UDP_CKSUM:
327 hdr->csum_start = cookie->l2_len + cookie->l3_len;
328 hdr->csum_offset = offsetof(struct udp_hdr,
330 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
333 case PKT_TX_TCP_CKSUM:
334 hdr->csum_start = cookie->l2_len + cookie->l3_len;
335 hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
336 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
341 hdr->csum_offset = 0;
346 /* TCP Segmentation Offload */
347 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
348 virtio_tso_fix_cksum(cookie);
349 hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
350 VIRTIO_NET_HDR_GSO_TCPV6 :
351 VIRTIO_NET_HDR_GSO_TCPV4;
352 hdr->gso_size = cookie->tso_segsz;
365 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
366 start_dp[idx].len = cookie->data_len;
367 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
368 idx = start_dp[idx].next;
369 } while ((cookie = cookie->next) != NULL);
372 idx = vq->vq_ring.desc[head_idx].next;
374 vq->vq_desc_head_idx = idx;
375 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
376 vq->vq_desc_tail_idx = idx;
377 vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
378 vq_update_avail_ring(vq, head_idx);
382 virtio_dev_cq_start(struct rte_eth_dev *dev)
384 struct virtio_hw *hw = dev->data->dev_private;
386 if (hw->cvq && hw->cvq->vq) {
387 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
392 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
395 * Start receive and transmit vrings
396 * - Setup vring structure for all queues
397 * - Initialize descriptor for the rx vring
398 * - Allocate blank mbufs for the each rx descriptor
403 struct virtio_hw *hw = dev->data->dev_private;
405 PMD_INIT_FUNC_TRACE();
407 /* Start rx vring. */
408 for (i = 0; i < dev->data->nb_rx_queues; i++) {
409 struct virtnet_rx *rxvq = dev->data->rx_queues[i];
410 struct virtqueue *vq = rxvq->vq;
414 if (rxvq->mpool == NULL) {
415 rte_exit(EXIT_FAILURE,
416 "Cannot allocate mbufs for rx virtqueue");
419 /* Allocate blank mbufs for the each rx descriptor */
423 if (hw->use_simple_rxtx) {
424 for (desc_idx = 0; desc_idx < vq->vq_nentries;
426 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
427 vq->vq_ring.desc[desc_idx].flags =
432 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
433 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
435 vq->sw_ring[vq->vq_nentries + desc_idx] =
439 while (!virtqueue_full(vq)) {
440 m = rte_mbuf_raw_alloc(rxvq->mpool);
444 /******************************************
445 * Enqueue allocated buffers *
446 *******************************************/
447 if (hw->use_simple_rxtx)
448 error = virtqueue_enqueue_recv_refill_simple(vq, m);
450 error = virtqueue_enqueue_recv_refill(vq, m);
459 vq_update_avail_idx(vq);
461 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
466 /* Start tx vring. */
467 for (i = 0; i < dev->data->nb_tx_queues; i++) {
468 struct virtnet_tx *txvq = dev->data->tx_queues[i];
469 struct virtqueue *vq = txvq->vq;
471 if (hw->use_simple_rxtx) {
472 uint16_t mid_idx = vq->vq_nentries >> 1;
474 for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
475 vq->vq_ring.avail->ring[desc_idx] =
477 vq->vq_ring.desc[desc_idx + mid_idx].next =
479 vq->vq_ring.desc[desc_idx + mid_idx].addr =
480 txvq->virtio_net_hdr_mem +
481 offsetof(struct virtio_tx_region, tx_hdr);
482 vq->vq_ring.desc[desc_idx + mid_idx].len =
483 vq->hw->vtnet_hdr_size;
484 vq->vq_ring.desc[desc_idx + mid_idx].flags =
486 vq->vq_ring.desc[desc_idx].flags = 0;
488 for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
490 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
498 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
501 unsigned int socket_id __rte_unused,
502 __rte_unused const struct rte_eth_rxconf *rx_conf,
503 struct rte_mempool *mp)
505 uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
506 struct virtio_hw *hw = dev->data->dev_private;
507 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
508 struct virtnet_rx *rxvq;
510 PMD_INIT_FUNC_TRACE();
512 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
513 nb_desc = vq->vq_nentries;
514 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
518 rxvq->queue_id = queue_idx;
520 dev->data->rx_queues[queue_idx] = rxvq;
522 virtio_rxq_vec_setup(rxvq);
528 virtio_update_rxtx_handler(struct rte_eth_dev *dev,
529 const struct rte_eth_txconf *tx_conf)
531 uint8_t use_simple_rxtx = 0;
532 struct virtio_hw *hw = dev->data->dev_private;
534 #if defined RTE_ARCH_X86
535 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE3))
537 #elif defined RTE_ARCH_ARM64 || defined CONFIG_RTE_ARCH_ARM
538 if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))
541 /* Use simple rx/tx func if single segment and no offloads */
542 if (use_simple_rxtx &&
543 (tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
544 !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
545 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
546 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
547 dev->rx_pkt_burst = virtio_recv_pkts_vec;
548 hw->use_simple_rxtx = use_simple_rxtx;
553 * struct rte_eth_dev *dev: Used to update dev
554 * uint16_t nb_desc: Defaults to values read from config space
555 * unsigned int socket_id: Used to allocate memzone
556 * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
557 * uint16_t queue_idx: Just used as an index in dev txq list
560 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
563 unsigned int socket_id __rte_unused,
564 const struct rte_eth_txconf *tx_conf)
566 uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
567 struct virtio_hw *hw = dev->data->dev_private;
568 struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
569 struct virtnet_tx *txvq;
570 uint16_t tx_free_thresh;
572 PMD_INIT_FUNC_TRACE();
574 virtio_update_rxtx_handler(dev, tx_conf);
576 if (nb_desc == 0 || nb_desc > vq->vq_nentries)
577 nb_desc = vq->vq_nentries;
578 vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
581 txvq->queue_id = queue_idx;
583 tx_free_thresh = tx_conf->tx_free_thresh;
584 if (tx_free_thresh == 0)
586 RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
588 if (tx_free_thresh >= (vq->vq_nentries - 3)) {
589 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
590 "number of TX entries minus 3 (%u)."
591 " (tx_free_thresh=%u port=%u queue=%u)\n",
593 tx_free_thresh, dev->data->port_id, queue_idx);
597 vq->vq_free_thresh = tx_free_thresh;
599 dev->data->tx_queues[queue_idx] = txvq;
604 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
608 * Requeue the discarded mbuf. This should always be
609 * successful since it was just dequeued.
611 error = virtqueue_enqueue_recv_refill(vq, m);
612 if (unlikely(error)) {
613 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
619 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
621 uint32_t s = mbuf->pkt_len;
622 struct ether_addr *ea;
625 stats->size_bins[1]++;
626 } else if (s > 64 && s < 1024) {
629 /* count zeros, and offset into correct bin */
630 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
631 stats->size_bins[bin]++;
634 stats->size_bins[0]++;
636 stats->size_bins[6]++;
638 stats->size_bins[7]++;
641 ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
642 if (is_multicast_ether_addr(ea)) {
643 if (is_broadcast_ether_addr(ea))
650 /* Optionally fill offload information in structure */
652 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
654 struct rte_net_hdr_lens hdr_lens;
655 uint32_t hdrlen, ptype;
656 int l4_supported = 0;
659 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
662 m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
664 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
665 m->packet_type = ptype;
666 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
667 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
668 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
671 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
672 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
673 if (hdr->csum_start <= hdrlen && l4_supported) {
674 m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
676 /* Unknown proto or tunnel, do sw cksum. We can assume
677 * the cksum field is in the first segment since the
678 * buffers we provided to the host are large enough.
679 * In case of SCTP, this will be wrong since it's a CRC
680 * but there's nothing we can do.
684 rte_raw_cksum_mbuf(m, hdr->csum_start,
685 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
687 if (likely(csum != 0xffff))
689 off = hdr->csum_offset + hdr->csum_start;
690 if (rte_pktmbuf_data_len(m) >= off + 1)
691 *rte_pktmbuf_mtod_offset(m, uint16_t *,
694 } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
695 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
698 /* GSO request, save required information in mbuf */
699 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
700 /* Check unsupported modes */
701 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
702 (hdr->gso_size == 0)) {
706 /* Update mss lengthes in mbuf */
707 m->tso_segsz = hdr->gso_size;
708 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
709 case VIRTIO_NET_HDR_GSO_TCPV4:
710 case VIRTIO_NET_HDR_GSO_TCPV6:
711 m->ol_flags |= PKT_RX_LRO | \
712 PKT_RX_L4_CKSUM_NONE;
723 rx_offload_enabled(struct virtio_hw *hw)
725 return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
726 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
727 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
730 #define VIRTIO_MBUF_BURST_SZ 64
731 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
733 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
735 struct virtnet_rx *rxvq = rx_queue;
736 struct virtqueue *vq = rxvq->vq;
737 struct virtio_hw *hw;
738 struct rte_mbuf *rxm, *new_mbuf;
739 uint16_t nb_used, num, nb_rx;
740 uint32_t len[VIRTIO_MBUF_BURST_SZ];
741 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
743 uint32_t i, nb_enqueued;
746 struct virtio_net_hdr *hdr;
748 nb_used = VIRTQUEUE_NUSED(vq);
752 num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
753 num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? 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);
763 hdr_size = hw->vtnet_hdr_size;
764 offload = rx_offload_enabled(hw);
766 for (i = 0; i < num ; i++) {
769 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
771 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
772 PMD_RX_LOG(ERR, "Packet drop");
774 virtio_discard_rxbuf(vq, rxm);
775 rxvq->stats.errors++;
779 rxm->port = rxvq->port_id;
780 rxm->data_off = RTE_PKTMBUF_HEADROOM;
786 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
787 rxm->data_len = (uint16_t)(len[i] - hdr_size);
789 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
790 RTE_PKTMBUF_HEADROOM - hdr_size);
795 if (offload && virtio_rx_offload(rxm, hdr) < 0) {
796 virtio_discard_rxbuf(vq, rxm);
797 rxvq->stats.errors++;
801 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
803 rx_pkts[nb_rx++] = rxm;
805 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len;
806 virtio_update_packet_stats(&rxvq->stats, rxm);
809 rxvq->stats.packets += nb_rx;
811 /* Allocate new mbuf for the used descriptor */
813 while (likely(!virtqueue_full(vq))) {
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(vq, new_mbuf);
822 if (unlikely(error)) {
823 rte_pktmbuf_free(new_mbuf);
829 if (likely(nb_enqueued)) {
830 vq_update_avail_idx(vq);
832 if (unlikely(virtqueue_kick_prepare(vq))) {
833 virtqueue_notify(vq);
834 PMD_RX_LOG(DEBUG, "Notified");
842 virtio_recv_mergeable_pkts(void *rx_queue,
843 struct rte_mbuf **rx_pkts,
846 struct virtnet_rx *rxvq = rx_queue;
847 struct virtqueue *vq = rxvq->vq;
848 struct virtio_hw *hw;
849 struct rte_mbuf *rxm, *new_mbuf;
850 uint16_t nb_used, num, nb_rx;
851 uint32_t len[VIRTIO_MBUF_BURST_SZ];
852 struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
853 struct rte_mbuf *prev;
855 uint32_t i, nb_enqueued;
862 nb_used = VIRTQUEUE_NUSED(vq);
866 PMD_RX_LOG(DEBUG, "used:%d", nb_used);
875 hdr_size = hw->vtnet_hdr_size;
876 offload = rx_offload_enabled(hw);
878 while (i < nb_used) {
879 struct virtio_net_hdr_mrg_rxbuf *header;
881 if (nb_rx == nb_pkts)
884 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
890 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
891 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
895 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
896 PMD_RX_LOG(ERR, "Packet drop");
898 virtio_discard_rxbuf(vq, rxm);
899 rxvq->stats.errors++;
903 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
904 RTE_PKTMBUF_HEADROOM - hdr_size);
905 seg_num = header->num_buffers;
910 rxm->data_off = RTE_PKTMBUF_HEADROOM;
911 rxm->nb_segs = seg_num;
915 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
916 rxm->data_len = (uint16_t)(len[0] - hdr_size);
918 rxm->port = rxvq->port_id;
919 rx_pkts[nb_rx] = rxm;
922 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
923 virtio_discard_rxbuf(vq, rxm);
924 rxvq->stats.errors++;
928 seg_res = seg_num - 1;
930 while (seg_res != 0) {
932 * Get extra segments for current uncompleted packet.
935 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
936 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
938 virtqueue_dequeue_burst_rx(vq,
939 rcv_pkts, len, rcv_cnt);
944 "No enough segments for packet.");
946 virtio_discard_rxbuf(vq, rxm);
947 rxvq->stats.errors++;
953 while (extra_idx < rcv_cnt) {
954 rxm = rcv_pkts[extra_idx];
956 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
958 rxm->pkt_len = (uint32_t)(len[extra_idx]);
959 rxm->data_len = (uint16_t)(len[extra_idx]);
965 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
972 rte_vlan_strip(rx_pkts[nb_rx]);
974 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
975 rx_pkts[nb_rx]->data_len);
977 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
978 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
982 rxvq->stats.packets += nb_rx;
984 /* Allocate new mbuf for the used descriptor */
986 while (likely(!virtqueue_full(vq))) {
987 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
988 if (unlikely(new_mbuf == NULL)) {
989 struct rte_eth_dev *dev
990 = &rte_eth_devices[rxvq->port_id];
991 dev->data->rx_mbuf_alloc_failed++;
994 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
995 if (unlikely(error)) {
996 rte_pktmbuf_free(new_mbuf);
1002 if (likely(nb_enqueued)) {
1003 vq_update_avail_idx(vq);
1005 if (unlikely(virtqueue_kick_prepare(vq))) {
1006 virtqueue_notify(vq);
1007 PMD_RX_LOG(DEBUG, "Notified");
1015 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1017 struct virtnet_tx *txvq = tx_queue;
1018 struct virtqueue *vq = txvq->vq;
1019 struct virtio_hw *hw = vq->hw;
1020 uint16_t hdr_size = hw->vtnet_hdr_size;
1021 uint16_t nb_used, nb_tx;
1024 if (unlikely(nb_pkts < 1))
1027 PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1028 nb_used = VIRTQUEUE_NUSED(vq);
1031 if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1032 virtio_xmit_cleanup(vq, nb_used);
1034 for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1035 struct rte_mbuf *txm = tx_pkts[nb_tx];
1036 int can_push = 0, use_indirect = 0, slots, need;
1038 /* Do VLAN tag insertion */
1039 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1040 error = rte_vlan_insert(&txm);
1041 if (unlikely(error)) {
1042 rte_pktmbuf_free(txm);
1047 /* optimize ring usage */
1048 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
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");