- return 0;
-}
-
-/**
- * This function adds buffers to the virtio devices RX virtqueue. Buffers can
- * be received from the physical port or from another virtio device. A packet
- * count is returned to indicate the number of packets that are succesfully
- * added to the RX queue. This function works when the mbuf is scattered, but
- * it doesn't support the mergeable feature.
- */
-static inline uint32_t __attribute__((always_inline))
-virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
- struct rte_mbuf **pkts, uint32_t count)
-{
- struct vhost_virtqueue *vq;
- uint16_t avail_idx, free_entries, start_idx;
- uint16_t desc_indexes[MAX_PKT_BURST];
- uint16_t used_idx;
- uint32_t i;
-
- LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__);
- if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->virt_qp_nb))) {
- RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
- dev->vid, __func__, queue_id);
- return 0;
- }
-
- vq = dev->virtqueue[queue_id];
- if (unlikely(vq->enabled == 0))
- return 0;
-
- avail_idx = *((volatile uint16_t *)&vq->avail->idx);
- start_idx = vq->last_used_idx;
- free_entries = avail_idx - start_idx;
- count = RTE_MIN(count, free_entries);
- count = RTE_MIN(count, (uint32_t)MAX_PKT_BURST);
- if (count == 0)
- return 0;
-
- LOG_DEBUG(VHOST_DATA, "(%d) start_idx %d | end_idx %d\n",
- dev->vid, start_idx, start_idx + count);
-
- /* Retrieve all of the desc indexes first to avoid caching issues. */
- rte_prefetch0(&vq->avail->ring[start_idx & (vq->size - 1)]);
- for (i = 0; i < count; i++) {
- used_idx = (start_idx + i) & (vq->size - 1);
- desc_indexes[i] = vq->avail->ring[used_idx];
- vq->used->ring[used_idx].id = desc_indexes[i];
- vq->used->ring[used_idx].len = pkts[i]->pkt_len +
- dev->vhost_hlen;
- vhost_log_used_vring(dev, vq,
- offsetof(struct vring_used, ring[used_idx]),
- sizeof(vq->used->ring[used_idx]));
- }
-
- rte_prefetch0(&vq->desc[desc_indexes[0]]);
- for (i = 0; i < count; i++) {
- uint16_t desc_idx = desc_indexes[i];
- int err;
-
- err = copy_mbuf_to_desc(dev, vq, pkts[i], desc_idx);
- if (unlikely(err)) {
- used_idx = (start_idx + i) & (vq->size - 1);
- vq->used->ring[used_idx].len = dev->vhost_hlen;
- vhost_log_used_vring(dev, vq,
- offsetof(struct vring_used, ring[used_idx]),
- sizeof(vq->used->ring[used_idx]));
- }
-
- if (i + 1 < count)
- rte_prefetch0(&vq->desc[desc_indexes[i+1]]);
- }
-
- rte_smp_wmb();
-
- *(volatile uint16_t *)&vq->used->idx += count;
- vq->last_used_idx += count;
- vhost_log_used_vring(dev, vq,
- offsetof(struct vring_used, idx),
- sizeof(vq->used->idx));
-
- /* flush used->idx update before we read avail->flags. */
- rte_mb();
-
- /* Kick the guest if necessary. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
- && (vq->callfd >= 0))
- eventfd_write(vq->callfd, (eventfd_t)1);
- return count;
-}
-
-static inline int
-fill_vec_buf(struct vhost_virtqueue *vq, uint32_t avail_idx,
- uint32_t *allocated, uint32_t *vec_idx,
- struct buf_vector *buf_vec)
-{
- uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
- uint32_t vec_id = *vec_idx;
- uint32_t len = *allocated;
-