+/* Region reserved to allow for transmit header and indirect ring */
+#define VIRTIO_MAX_TX_INDIRECT 8
+struct virtio_tx_region {
+ struct virtio_net_hdr_mrg_rxbuf tx_hdr;
+ struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
+ __rte_aligned(16);
+};
+
+static inline int
+desc_is_used(struct vring_packed_desc *desc, struct virtqueue *vq)
+{
+ uint16_t used, avail, flags;
+
+ flags = virtqueue_fetch_flags_packed(desc, vq->hw->weak_barriers);
+ used = !!(flags & VRING_PACKED_DESC_F_USED);
+ avail = !!(flags & VRING_PACKED_DESC_F_AVAIL);
+
+ return avail == used && used == vq->vq_packed.used_wrap_counter;
+}
+
+static inline void
+vring_desc_init_packed(struct virtqueue *vq, int n)
+{
+ int i;
+ for (i = 0; i < n - 1; i++) {
+ vq->vq_packed.ring.desc[i].id = i;
+ vq->vq_descx[i].next = i + 1;
+ }
+ vq->vq_packed.ring.desc[i].id = i;
+ vq->vq_descx[i].next = VQ_RING_DESC_CHAIN_END;
+}
+
+/* Chain all the descriptors in the ring with an END */
+static inline void
+vring_desc_init_split(struct vring_desc *dp, uint16_t n)
+{
+ uint16_t i;
+
+ for (i = 0; i < n - 1; i++)
+ dp[i].next = (uint16_t)(i + 1);
+ dp[i].next = VQ_RING_DESC_CHAIN_END;
+}
+
+/**
+ * Tell the backend not to interrupt us. Implementation for packed virtqueues.
+ */
+static inline void
+virtqueue_disable_intr_packed(struct virtqueue *vq)
+{
+ if (vq->vq_packed.event_flags_shadow != RING_EVENT_FLAGS_DISABLE) {
+ vq->vq_packed.event_flags_shadow = RING_EVENT_FLAGS_DISABLE;
+ vq->vq_packed.ring.driver->desc_event_flags =
+ vq->vq_packed.event_flags_shadow;
+ }
+}
+
+/**
+ * Tell the backend not to interrupt us. Implementation for split virtqueues.
+ */
+static inline void
+virtqueue_disable_intr_split(struct virtqueue *vq)
+{
+ vq->vq_split.ring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
+}
+