- /*check that we have enough buffers*/
- if (unlikely(count > free_entries))
- count = free_entries;
-
- if (unlikely(count == 0)) {
- LOG_DEBUG(DATA,
- "(%"PRIu64") Fail in get_available_ring_index_zcp: "
- "avail idx: %d, res base idx:%d, free entries:%d\n",
- dev->device_fh, avail_idx,
- *res_base_idx, free_entries);
- return 0;
- }
-
- vq->last_used_idx_res = *res_base_idx + count;
-
- return count;
-}
-
-/*
- * This function put descriptor back to used list.
- */
-static inline void __attribute__((always_inline))
-put_desc_to_used_list_zcp(struct vhost_virtqueue *vq, uint16_t desc_idx)
-{
- uint16_t res_cur_idx = vq->last_used_idx;
- vq->used->ring[res_cur_idx & (vq->size - 1)].id = (uint32_t)desc_idx;
- vq->used->ring[res_cur_idx & (vq->size - 1)].len = 0;
- rte_compiler_barrier();
- *(volatile uint16_t *)&vq->used->idx += 1;
- vq->last_used_idx += 1;
-
- /* Kick the guest if necessary. */
- if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
- eventfd_write((int)vq->kickfd, 1);
-}
-
-/*
- * This function get available descriptor from vitio vring and un-attached mbuf
- * from vpool->ring, and then attach them together. It needs adjust the offset
- * for buff_addr and phys_addr accroding to PMD implementation, otherwise the
- * frame data may be put to wrong location in mbuf.
- */
-static inline void __attribute__((always_inline))
-attach_rxmbuf_zcp(struct virtio_net *dev)
-{
- uint16_t res_base_idx, desc_idx;
- uint64_t buff_addr, phys_addr;
- struct vhost_virtqueue *vq;
- struct vring_desc *desc;
- struct rte_mbuf *mbuf = NULL;
- struct vpool *vpool;
- hpa_type addr_type;
-
- vpool = &vpool_array[dev->vmdq_rx_q];
- vq = dev->virtqueue[VIRTIO_RXQ];
-
- do {
- if (unlikely(get_available_ring_index_zcp(dev, &res_base_idx,
- 1) != 1))
- return;
- desc_idx = vq->avail->ring[(res_base_idx) & (vq->size - 1)];
-
- desc = &vq->desc[desc_idx];
- if (desc->flags & VRING_DESC_F_NEXT) {
- desc = &vq->desc[desc->next];
- buff_addr = gpa_to_vva(dev, desc->addr);
- phys_addr = gpa_to_hpa(dev, desc->addr, desc->len,
- &addr_type);
- } else {
- buff_addr = gpa_to_vva(dev,
- desc->addr + vq->vhost_hlen);
- phys_addr = gpa_to_hpa(dev,
- desc->addr + vq->vhost_hlen,
- desc->len, &addr_type);
- }
-
- if (unlikely(addr_type == PHYS_ADDR_INVALID)) {
- RTE_LOG(ERR, DATA, "(%"PRIu64") Invalid frame buffer"
- " address found when attaching RX frame buffer"
- " address!\n", dev->device_fh);
- put_desc_to_used_list_zcp(vq, desc_idx);
- continue;
- }
-
- /*
- * Check if the frame buffer address from guest crosses
- * sub-region or not.
- */
- if (unlikely(addr_type == PHYS_ADDR_CROSS_SUBREG)) {
- RTE_LOG(ERR, DATA,
- "(%"PRIu64") Frame buffer address cross "
- "sub-regioin found when attaching RX frame "
- "buffer address!\n",
- dev->device_fh);
- put_desc_to_used_list_zcp(vq, desc_idx);
- continue;
- }
- } while (unlikely(phys_addr == 0));
-
- rte_ring_sc_dequeue(vpool->ring, (void **)&mbuf);
- if (unlikely(mbuf == NULL)) {
- LOG_DEBUG(DATA,
- "(%"PRIu64") in attach_rxmbuf_zcp: "
- "ring_sc_dequeue fail.\n",
- dev->device_fh);
- put_desc_to_used_list_zcp(vq, desc_idx);
- return;