-static __rte_always_inline void
-vhost_update_used_packed(struct vhost_virtqueue *vq,
- struct vring_used_elem_packed *shadow_ring,
- uint16_t count)
-{
- int i;
- uint16_t used_idx = vq->last_used_idx;
- uint16_t head_idx = vq->last_used_idx;
- uint16_t head_flags = 0;
-
- if (count == 0)
- return;
-
- /* Split loop in two to save memory barriers */
- for (i = 0; i < count; i++) {
- vq->desc_packed[used_idx].id = shadow_ring[i].id;
- vq->desc_packed[used_idx].len = shadow_ring[i].len;
-
- used_idx += shadow_ring[i].count;
- if (used_idx >= vq->size)
- used_idx -= vq->size;
- }
-
- /* The ordering for storing desc flags needs to be enforced. */
- rte_atomic_thread_fence(__ATOMIC_RELEASE);
-
- for (i = 0; i < count; i++) {
- uint16_t flags;
-
- if (vq->shadow_used_packed[i].len)
- flags = VRING_DESC_F_WRITE;
- else
- flags = 0;
-
- if (vq->used_wrap_counter) {
- flags |= VRING_DESC_F_USED;
- flags |= VRING_DESC_F_AVAIL;
- } else {
- flags &= ~VRING_DESC_F_USED;
- flags &= ~VRING_DESC_F_AVAIL;
- }
-
- if (i > 0) {
- vq->desc_packed[vq->last_used_idx].flags = flags;
- } else {
- head_idx = vq->last_used_idx;
- head_flags = flags;
- }
-
- vq_inc_last_used_packed(vq, shadow_ring[i].count);
- }
-
- vq->desc_packed[head_idx].flags = head_flags;
-}