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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31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <linux/virtio_net.h>
39 #include <rte_memcpy.h>
40 #include <rte_ether.h>
42 #include <rte_virtio_net.h>
48 #include "vhost-net.h"
50 #define MAX_PKT_BURST 32
51 #define VHOST_LOG_PAGE 4096
53 static inline void __attribute__((always_inline))
54 vhost_log_page(uint8_t *log_base, uint64_t page)
56 log_base[page / 8] |= 1 << (page % 8);
59 static inline void __attribute__((always_inline))
60 vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
64 if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) ||
65 !dev->log_base || !len))
68 if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
71 /* To make sure guest memory updates are committed before logging */
74 page = addr / VHOST_LOG_PAGE;
75 while (page * VHOST_LOG_PAGE < addr + len) {
76 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
81 static inline void __attribute__((always_inline))
82 vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
83 uint64_t offset, uint64_t len)
85 vhost_log_write(dev, vq->log_guest_addr + offset, len);
89 is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t qp_nb)
91 return (is_tx ^ (idx & 1)) == 0 && idx < qp_nb * VIRTIO_QNUM;
95 virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
97 memset(net_hdr, 0, sizeof(struct virtio_net_hdr));
99 if (m_buf->ol_flags & PKT_TX_L4_MASK) {
100 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
101 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
103 switch (m_buf->ol_flags & PKT_TX_L4_MASK) {
104 case PKT_TX_TCP_CKSUM:
105 net_hdr->csum_offset = (offsetof(struct tcp_hdr,
108 case PKT_TX_UDP_CKSUM:
109 net_hdr->csum_offset = (offsetof(struct udp_hdr,
112 case PKT_TX_SCTP_CKSUM:
113 net_hdr->csum_offset = (offsetof(struct sctp_hdr,
119 if (m_buf->ol_flags & PKT_TX_TCP_SEG) {
120 if (m_buf->ol_flags & PKT_TX_IPV4)
121 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
123 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
124 net_hdr->gso_size = m_buf->tso_segsz;
125 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
133 copy_virtio_net_hdr(struct vhost_virtqueue *vq, uint64_t desc_addr,
134 struct virtio_net_hdr_mrg_rxbuf hdr)
136 if (vq->vhost_hlen == sizeof(struct virtio_net_hdr_mrg_rxbuf))
137 *(struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)desc_addr = hdr;
139 *(struct virtio_net_hdr *)(uintptr_t)desc_addr = hdr.hdr;
142 static inline int __attribute__((always_inline))
143 copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
144 struct rte_mbuf *m, uint16_t desc_idx, uint32_t *copied)
146 uint32_t desc_avail, desc_offset;
147 uint32_t mbuf_avail, mbuf_offset;
149 struct vring_desc *desc;
151 struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0};
153 desc = &vq->desc[desc_idx];
154 if (unlikely(desc->len < vq->vhost_hlen))
157 desc_addr = gpa_to_vva(dev, desc->addr);
158 rte_prefetch0((void *)(uintptr_t)desc_addr);
160 virtio_enqueue_offload(m, &virtio_hdr.hdr);
161 copy_virtio_net_hdr(vq, desc_addr, virtio_hdr);
162 vhost_log_write(dev, desc->addr, vq->vhost_hlen);
163 PRINT_PACKET(dev, (uintptr_t)desc_addr, vq->vhost_hlen, 0);
165 desc_offset = vq->vhost_hlen;
166 desc_avail = desc->len - vq->vhost_hlen;
168 *copied = rte_pktmbuf_pkt_len(m);
169 mbuf_avail = rte_pktmbuf_data_len(m);
171 while (mbuf_avail != 0 || m->next != NULL) {
172 /* done with current mbuf, fetch next */
173 if (mbuf_avail == 0) {
177 mbuf_avail = rte_pktmbuf_data_len(m);
180 /* done with current desc buf, fetch next */
181 if (desc_avail == 0) {
182 if ((desc->flags & VRING_DESC_F_NEXT) == 0) {
183 /* Room in vring buffer is not enough */
186 if (unlikely(desc->next >= vq->size))
189 desc = &vq->desc[desc->next];
190 desc_addr = gpa_to_vva(dev, desc->addr);
192 desc_avail = desc->len;
195 cpy_len = RTE_MIN(desc_avail, mbuf_avail);
196 rte_memcpy((void *)((uintptr_t)(desc_addr + desc_offset)),
197 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
199 vhost_log_write(dev, desc->addr + desc_offset, cpy_len);
200 PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
203 mbuf_avail -= cpy_len;
204 mbuf_offset += cpy_len;
205 desc_avail -= cpy_len;
206 desc_offset += cpy_len;
213 * As many data cores may want to access available buffers
214 * they need to be reserved.
216 static inline uint32_t
217 reserve_avail_buf(struct vhost_virtqueue *vq, uint32_t count,
218 uint16_t *start, uint16_t *end)
220 uint16_t res_start_idx;
221 uint16_t res_end_idx;
223 uint16_t free_entries;
226 count = RTE_MIN(count, (uint32_t)MAX_PKT_BURST);
229 res_start_idx = vq->last_used_idx_res;
230 avail_idx = *((volatile uint16_t *)&vq->avail->idx);
232 free_entries = avail_idx - res_start_idx;
233 count = RTE_MIN(count, free_entries);
237 res_end_idx = res_start_idx + count;
240 * update vq->last_used_idx_res atomically; try again if failed.
242 * TODO: Allow to disable cmpset if no concurrency in application.
244 success = rte_atomic16_cmpset(&vq->last_used_idx_res,
245 res_start_idx, res_end_idx);
246 if (unlikely(!success))
249 *start = res_start_idx;
256 * This function adds buffers to the virtio devices RX virtqueue. Buffers can
257 * be received from the physical port or from another virtio device. A packet
258 * count is returned to indicate the number of packets that are succesfully
259 * added to the RX queue. This function works when the mbuf is scattered, but
260 * it doesn't support the mergeable feature.
262 static inline uint32_t __attribute__((always_inline))
263 virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
264 struct rte_mbuf **pkts, uint32_t count)
266 struct vhost_virtqueue *vq;
267 uint16_t res_start_idx, res_end_idx;
268 uint16_t desc_indexes[MAX_PKT_BURST];
271 LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_rx()\n", dev->device_fh);
272 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->virt_qp_nb))) {
273 RTE_LOG(ERR, VHOST_DATA,
274 "%s (%"PRIu64"): virtqueue idx:%d invalid.\n",
275 __func__, dev->device_fh, queue_id);
279 vq = dev->virtqueue[queue_id];
280 if (unlikely(vq->enabled == 0))
283 count = reserve_avail_buf(vq, count, &res_start_idx, &res_end_idx);
287 LOG_DEBUG(VHOST_DATA,
288 "(%"PRIu64") res_start_idx %d| res_end_idx Index %d\n",
289 dev->device_fh, res_start_idx, res_end_idx);
291 /* Retrieve all of the desc indexes first to avoid caching issues. */
292 rte_prefetch0(&vq->avail->ring[res_start_idx & (vq->size - 1)]);
293 for (i = 0; i < count; i++) {
294 desc_indexes[i] = vq->avail->ring[(res_start_idx + i) &
298 rte_prefetch0(&vq->desc[desc_indexes[0]]);
299 for (i = 0; i < count; i++) {
300 uint16_t desc_idx = desc_indexes[i];
301 uint16_t used_idx = (res_start_idx + i) & (vq->size - 1);
305 err = copy_mbuf_to_desc(dev, vq, pkts[i], desc_idx, &copied);
307 vq->used->ring[used_idx].id = desc_idx;
309 vq->used->ring[used_idx].len = vq->vhost_hlen;
311 vq->used->ring[used_idx].len = copied + vq->vhost_hlen;
312 vhost_log_used_vring(dev, vq,
313 offsetof(struct vring_used, ring[used_idx]),
314 sizeof(vq->used->ring[used_idx]));
317 rte_prefetch0(&vq->desc[desc_indexes[i+1]]);
320 rte_compiler_barrier();
322 /* Wait until it's our turn to add our buffer to the used ring. */
323 while (unlikely(vq->last_used_idx != res_start_idx))
326 *(volatile uint16_t *)&vq->used->idx += count;
327 vq->last_used_idx = res_end_idx;
328 vhost_log_used_vring(dev, vq,
329 offsetof(struct vring_used, idx),
330 sizeof(vq->used->idx));
332 /* flush used->idx update before we read avail->flags. */
335 /* Kick the guest if necessary. */
336 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
337 && (vq->callfd >= 0))
338 eventfd_write(vq->callfd, (eventfd_t)1);
343 fill_vec_buf(struct vhost_virtqueue *vq, uint32_t avail_idx,
344 uint32_t *allocated, uint32_t *vec_idx)
346 uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
347 uint32_t vec_id = *vec_idx;
348 uint32_t len = *allocated;
351 if (unlikely(vec_id >= BUF_VECTOR_MAX || idx >= vq->size))
354 len += vq->desc[idx].len;
355 vq->buf_vec[vec_id].buf_addr = vq->desc[idx].addr;
356 vq->buf_vec[vec_id].buf_len = vq->desc[idx].len;
357 vq->buf_vec[vec_id].desc_idx = idx;
360 if ((vq->desc[idx].flags & VRING_DESC_F_NEXT) == 0)
363 idx = vq->desc[idx].next;
373 * As many data cores may want to access available buffers concurrently,
374 * they need to be reserved.
376 * Returns -1 on fail, 0 on success
379 reserve_avail_buf_mergeable(struct vhost_virtqueue *vq, uint32_t size,
380 uint16_t *start, uint16_t *end)
382 uint16_t res_start_idx;
383 uint16_t res_cur_idx;
390 res_start_idx = vq->last_used_idx_res;
391 res_cur_idx = res_start_idx;
397 avail_idx = *((volatile uint16_t *)&vq->avail->idx);
398 if (unlikely(res_cur_idx == avail_idx))
401 if (unlikely(fill_vec_buf(vq, res_cur_idx, &allocated,
408 if (allocated >= size)
412 * if we tried all available ring items, and still
413 * can't get enough buf, it means something abnormal
416 if (unlikely(tries >= vq->size))
421 * update vq->last_used_idx_res atomically.
422 * retry again if failed.
424 if (rte_atomic16_cmpset(&vq->last_used_idx_res,
425 res_start_idx, res_cur_idx) == 0)
428 *start = res_start_idx;
433 static inline uint32_t __attribute__((always_inline))
434 copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct vhost_virtqueue *vq,
435 uint16_t res_start_idx, uint16_t res_end_idx,
438 struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0};
439 uint32_t vec_idx = 0;
440 uint16_t cur_idx = res_start_idx;
442 uint32_t mbuf_offset, mbuf_avail;
443 uint32_t desc_offset, desc_avail;
445 uint16_t desc_idx, used_idx;
447 if (unlikely(m == NULL))
450 LOG_DEBUG(VHOST_DATA,
451 "(%"PRIu64") Current Index %d| End Index %d\n",
452 dev->device_fh, cur_idx, res_end_idx);
454 if (vq->buf_vec[vec_idx].buf_len < vq->vhost_hlen)
457 desc_addr = gpa_to_vva(dev, vq->buf_vec[vec_idx].buf_addr);
458 rte_prefetch0((void *)(uintptr_t)desc_addr);
460 virtio_hdr.num_buffers = res_end_idx - res_start_idx;
461 LOG_DEBUG(VHOST_DATA, "(%"PRIu64") RX: Num merge buffers %d\n",
462 dev->device_fh, virtio_hdr.num_buffers);
464 virtio_enqueue_offload(m, &virtio_hdr.hdr);
465 copy_virtio_net_hdr(vq, desc_addr, virtio_hdr);
466 vhost_log_write(dev, vq->buf_vec[vec_idx].buf_addr, vq->vhost_hlen);
467 PRINT_PACKET(dev, (uintptr_t)desc_addr, vq->vhost_hlen, 0);
469 desc_avail = vq->buf_vec[vec_idx].buf_len - vq->vhost_hlen;
470 desc_offset = vq->vhost_hlen;
472 mbuf_avail = rte_pktmbuf_data_len(m);
474 while (mbuf_avail != 0 || m->next != NULL) {
475 /* done with current desc buf, get the next one */
476 if (desc_avail == 0) {
477 desc_idx = vq->buf_vec[vec_idx].desc_idx;
479 if (!(vq->desc[desc_idx].flags & VRING_DESC_F_NEXT)) {
480 /* Update used ring with desc information */
481 used_idx = cur_idx++ & (vq->size - 1);
482 vq->used->ring[used_idx].id = desc_idx;
483 vq->used->ring[used_idx].len = desc_offset;
484 vhost_log_used_vring(dev, vq,
485 offsetof(struct vring_used,
487 sizeof(vq->used->ring[used_idx]));
491 desc_addr = gpa_to_vva(dev, vq->buf_vec[vec_idx].buf_addr);
493 /* Prefetch buffer address. */
494 rte_prefetch0((void *)(uintptr_t)desc_addr);
496 desc_avail = vq->buf_vec[vec_idx].buf_len;
499 /* done with current mbuf, get the next one */
500 if (mbuf_avail == 0) {
504 mbuf_avail = rte_pktmbuf_data_len(m);
507 cpy_len = RTE_MIN(desc_avail, mbuf_avail);
508 rte_memcpy((void *)((uintptr_t)(desc_addr + desc_offset)),
509 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
511 vhost_log_write(dev, vq->buf_vec[vec_idx].buf_addr + desc_offset,
513 PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset),
516 mbuf_avail -= cpy_len;
517 mbuf_offset += cpy_len;
518 desc_avail -= cpy_len;
519 desc_offset += cpy_len;
522 used_idx = cur_idx & (vq->size - 1);
523 vq->used->ring[used_idx].id = vq->buf_vec[vec_idx].desc_idx;
524 vq->used->ring[used_idx].len = desc_offset;
525 vhost_log_used_vring(dev, vq,
526 offsetof(struct vring_used, ring[used_idx]),
527 sizeof(vq->used->ring[used_idx]));
529 return res_end_idx - res_start_idx;
532 static inline uint32_t __attribute__((always_inline))
533 virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
534 struct rte_mbuf **pkts, uint32_t count)
536 struct vhost_virtqueue *vq;
537 uint32_t pkt_idx = 0, nr_used = 0;
540 LOG_DEBUG(VHOST_DATA, "(%"PRIu64") virtio_dev_merge_rx()\n",
542 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->virt_qp_nb))) {
543 RTE_LOG(ERR, VHOST_DATA,
544 "%s (%"PRIu64"): virtqueue idx:%d invalid.\n",
545 __func__, dev->device_fh, queue_id);
549 vq = dev->virtqueue[queue_id];
550 if (unlikely(vq->enabled == 0))
553 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
557 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
558 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + vq->vhost_hlen;
560 if (unlikely(reserve_avail_buf_mergeable(vq, pkt_len,
561 &start, &end) < 0)) {
562 LOG_DEBUG(VHOST_DATA,
563 "(%" PRIu64 ") Failed to get enough desc from vring\n",
568 nr_used = copy_mbuf_to_desc_mergeable(dev, vq, start, end,
570 rte_compiler_barrier();
573 * Wait until it's our turn to add our buffer
576 while (unlikely(vq->last_used_idx != start))
579 *(volatile uint16_t *)&vq->used->idx += nr_used;
580 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
581 sizeof(vq->used->idx));
582 vq->last_used_idx = end;
585 if (likely(pkt_idx)) {
586 /* flush used->idx update before we read avail->flags. */
589 /* Kick the guest if necessary. */
590 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
591 && (vq->callfd >= 0))
592 eventfd_write(vq->callfd, (eventfd_t)1);
599 rte_vhost_enqueue_burst(struct virtio_net *dev, uint16_t queue_id,
600 struct rte_mbuf **pkts, uint16_t count)
602 if (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF))
603 return virtio_dev_merge_rx(dev, queue_id, pkts, count);
605 return virtio_dev_rx(dev, queue_id, pkts, count);
609 parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr)
611 struct ipv4_hdr *ipv4_hdr;
612 struct ipv6_hdr *ipv6_hdr;
614 struct ether_hdr *eth_hdr;
617 eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
619 m->l2_len = sizeof(struct ether_hdr);
620 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
622 if (ethertype == ETHER_TYPE_VLAN) {
623 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
625 m->l2_len += sizeof(struct vlan_hdr);
626 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
629 l3_hdr = (char *)eth_hdr + m->l2_len;
632 case ETHER_TYPE_IPv4:
633 ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
634 *l4_proto = ipv4_hdr->next_proto_id;
635 m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
636 *l4_hdr = (char *)l3_hdr + m->l3_len;
637 m->ol_flags |= PKT_TX_IPV4;
639 case ETHER_TYPE_IPv6:
640 ipv6_hdr = (struct ipv6_hdr *)l3_hdr;
641 *l4_proto = ipv6_hdr->proto;
642 m->l3_len = sizeof(struct ipv6_hdr);
643 *l4_hdr = (char *)l3_hdr + m->l3_len;
644 m->ol_flags |= PKT_TX_IPV6;
653 static inline void __attribute__((always_inline))
654 vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m)
656 uint16_t l4_proto = 0;
658 struct tcp_hdr *tcp_hdr = NULL;
660 parse_ethernet(m, &l4_proto, &l4_hdr);
661 if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
662 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
663 switch (hdr->csum_offset) {
664 case (offsetof(struct tcp_hdr, cksum)):
665 if (l4_proto == IPPROTO_TCP)
666 m->ol_flags |= PKT_TX_TCP_CKSUM;
668 case (offsetof(struct udp_hdr, dgram_cksum)):
669 if (l4_proto == IPPROTO_UDP)
670 m->ol_flags |= PKT_TX_UDP_CKSUM;
672 case (offsetof(struct sctp_hdr, cksum)):
673 if (l4_proto == IPPROTO_SCTP)
674 m->ol_flags |= PKT_TX_SCTP_CKSUM;
682 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
683 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
684 case VIRTIO_NET_HDR_GSO_TCPV4:
685 case VIRTIO_NET_HDR_GSO_TCPV6:
686 tcp_hdr = (struct tcp_hdr *)l4_hdr;
687 m->ol_flags |= PKT_TX_TCP_SEG;
688 m->tso_segsz = hdr->gso_size;
689 m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
692 RTE_LOG(WARNING, VHOST_DATA,
693 "unsupported gso type %u.\n", hdr->gso_type);
699 #define RARP_PKT_SIZE 64
702 make_rarp_packet(struct rte_mbuf *rarp_mbuf, const struct ether_addr *mac)
704 struct ether_hdr *eth_hdr;
705 struct arp_hdr *rarp;
707 if (rarp_mbuf->buf_len < 64) {
708 RTE_LOG(WARNING, VHOST_DATA,
709 "failed to make RARP; mbuf size too small %u (< %d)\n",
710 rarp_mbuf->buf_len, RARP_PKT_SIZE);
714 /* Ethernet header. */
715 eth_hdr = rte_pktmbuf_mtod_offset(rarp_mbuf, struct ether_hdr *, 0);
716 memset(eth_hdr->d_addr.addr_bytes, 0xff, ETHER_ADDR_LEN);
717 ether_addr_copy(mac, ð_hdr->s_addr);
718 eth_hdr->ether_type = htons(ETHER_TYPE_RARP);
721 rarp = (struct arp_hdr *)(eth_hdr + 1);
722 rarp->arp_hrd = htons(ARP_HRD_ETHER);
723 rarp->arp_pro = htons(ETHER_TYPE_IPv4);
724 rarp->arp_hln = ETHER_ADDR_LEN;
726 rarp->arp_op = htons(ARP_OP_REVREQUEST);
728 ether_addr_copy(mac, &rarp->arp_data.arp_sha);
729 ether_addr_copy(mac, &rarp->arp_data.arp_tha);
730 memset(&rarp->arp_data.arp_sip, 0x00, 4);
731 memset(&rarp->arp_data.arp_tip, 0x00, 4);
733 rarp_mbuf->pkt_len = rarp_mbuf->data_len = RARP_PKT_SIZE;
738 static inline int __attribute__((always_inline))
739 copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
740 struct rte_mbuf *m, uint16_t desc_idx,
741 struct rte_mempool *mbuf_pool)
743 struct vring_desc *desc;
745 uint32_t desc_avail, desc_offset;
746 uint32_t mbuf_avail, mbuf_offset;
748 struct rte_mbuf *cur = m, *prev = m;
749 struct virtio_net_hdr *hdr;
750 /* A counter to avoid desc dead loop chain */
751 uint32_t nr_desc = 1;
753 desc = &vq->desc[desc_idx];
754 if (unlikely(desc->len < vq->vhost_hlen))
757 desc_addr = gpa_to_vva(dev, desc->addr);
758 rte_prefetch0((void *)(uintptr_t)desc_addr);
760 /* Retrieve virtio net header */
761 hdr = (struct virtio_net_hdr *)((uintptr_t)desc_addr);
762 desc_avail = desc->len - vq->vhost_hlen;
763 desc_offset = vq->vhost_hlen;
766 mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
767 while (desc_avail != 0 || (desc->flags & VRING_DESC_F_NEXT) != 0) {
768 /* This desc reaches to its end, get the next one */
769 if (desc_avail == 0) {
770 if (unlikely(desc->next >= vq->size ||
771 ++nr_desc >= vq->size))
773 desc = &vq->desc[desc->next];
775 desc_addr = gpa_to_vva(dev, desc->addr);
776 rte_prefetch0((void *)(uintptr_t)desc_addr);
779 desc_avail = desc->len;
781 PRINT_PACKET(dev, (uintptr_t)desc_addr, desc->len, 0);
785 * This mbuf reaches to its end, get a new one
788 if (mbuf_avail == 0) {
789 cur = rte_pktmbuf_alloc(mbuf_pool);
790 if (unlikely(cur == NULL)) {
791 RTE_LOG(ERR, VHOST_DATA, "Failed to "
792 "allocate memory for mbuf.\n");
797 prev->data_len = mbuf_offset;
799 m->pkt_len += mbuf_offset;
803 mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
806 cpy_len = RTE_MIN(desc_avail, mbuf_avail);
807 rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *, mbuf_offset),
808 (void *)((uintptr_t)(desc_addr + desc_offset)),
811 mbuf_avail -= cpy_len;
812 mbuf_offset += cpy_len;
813 desc_avail -= cpy_len;
814 desc_offset += cpy_len;
817 prev->data_len = mbuf_offset;
818 m->pkt_len += mbuf_offset;
820 if (hdr->flags != 0 || hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE)
821 vhost_dequeue_offload(hdr, m);
827 rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
828 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
830 struct rte_mbuf *rarp_mbuf = NULL;
831 struct vhost_virtqueue *vq;
832 uint32_t desc_indexes[MAX_PKT_BURST];
835 uint16_t free_entries;
838 if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->virt_qp_nb))) {
839 RTE_LOG(ERR, VHOST_DATA,
840 "%s (%"PRIu64"): virtqueue idx:%d invalid.\n",
841 __func__, dev->device_fh, queue_id);
845 vq = dev->virtqueue[queue_id];
846 if (unlikely(vq->enabled == 0))
850 * Construct a RARP broadcast packet, and inject it to the "pkts"
851 * array, to looks like that guest actually send such packet.
853 * Check user_send_rarp() for more information.
855 if (unlikely(rte_atomic16_cmpset((volatile uint16_t *)
856 &dev->broadcast_rarp.cnt, 1, 0))) {
857 rarp_mbuf = rte_pktmbuf_alloc(mbuf_pool);
858 if (rarp_mbuf == NULL) {
859 RTE_LOG(ERR, VHOST_DATA,
860 "Failed to allocate memory for mbuf.\n");
864 if (make_rarp_packet(rarp_mbuf, &dev->mac)) {
865 rte_pktmbuf_free(rarp_mbuf);
872 avail_idx = *((volatile uint16_t *)&vq->avail->idx);
873 free_entries = avail_idx - vq->last_used_idx;
874 if (free_entries == 0)
877 LOG_DEBUG(VHOST_DATA, "%s (%"PRIu64")\n", __func__, dev->device_fh);
879 /* Prefetch available ring to retrieve head indexes. */
880 used_idx = vq->last_used_idx & (vq->size - 1);
881 rte_prefetch0(&vq->avail->ring[used_idx]);
883 count = RTE_MIN(count, MAX_PKT_BURST);
884 count = RTE_MIN(count, free_entries);
885 LOG_DEBUG(VHOST_DATA, "(%"PRIu64") about to dequeue %u buffers\n",
886 dev->device_fh, count);
888 /* Retrieve all of the head indexes first to avoid caching issues. */
889 for (i = 0; i < count; i++) {
890 desc_indexes[i] = vq->avail->ring[(vq->last_used_idx + i) &
894 /* Prefetch descriptor index. */
895 rte_prefetch0(&vq->desc[desc_indexes[0]]);
896 rte_prefetch0(&vq->used->ring[vq->last_used_idx & (vq->size - 1)]);
898 for (i = 0; i < count; i++) {
901 if (likely(i + 1 < count)) {
902 rte_prefetch0(&vq->desc[desc_indexes[i + 1]]);
903 rte_prefetch0(&vq->used->ring[(used_idx + 1) &
907 pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
908 if (unlikely(pkts[i] == NULL)) {
909 RTE_LOG(ERR, VHOST_DATA,
910 "Failed to allocate memory for mbuf.\n");
913 err = copy_desc_to_mbuf(dev, vq, pkts[i], desc_indexes[i],
916 rte_pktmbuf_free(pkts[i]);
920 used_idx = vq->last_used_idx++ & (vq->size - 1);
921 vq->used->ring[used_idx].id = desc_indexes[i];
922 vq->used->ring[used_idx].len = 0;
923 vhost_log_used_vring(dev, vq,
924 offsetof(struct vring_used, ring[used_idx]),
925 sizeof(vq->used->ring[used_idx]));
928 rte_compiler_barrier();
930 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
931 sizeof(vq->used->idx));
933 /* Kick guest if required. */
934 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
935 && (vq->callfd >= 0))
936 eventfd_write(vq->callfd, (eventfd_t)1);
939 if (unlikely(rarp_mbuf != NULL)) {
941 * Inject it to the head of "pkts" array, so that switch's mac
942 * learning table will get updated first.
944 memmove(&pkts[1], pkts, i * sizeof(struct rte_mbuf *));