+/* 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;
+ union {
+ struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
+ __attribute__((__aligned__(16)));
+ struct vring_packed_desc tx_indir_pq[VIRTIO_MAX_TX_INDIRECT]
+ __attribute__((__aligned__(16)));
+ };
+};
+
+static inline int
+__desc_is_used(struct vring_packed_desc *desc, bool wrap_counter)
+{
+ uint16_t used, avail, flags;
+
+ flags = desc->flags;
+ used = !!(flags & VRING_DESC_F_USED(1));
+ avail = !!(flags & VRING_DESC_F_AVAIL(1));
+
+ return avail == used && used == wrap_counter;
+}
+
+static inline int
+desc_is_used(struct vring_packed_desc *desc, struct virtqueue *vq)
+{
+ return __desc_is_used(desc, vq->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->ring_packed.desc_packed[i].id = i;
+ vq->vq_descx[i].next = i + 1;
+ }
+ vq->ring_packed.desc_packed[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.
+ */
+static inline void
+virtqueue_disable_intr_packed(struct virtqueue *vq)
+{
+ uint16_t *event_flags = &vq->ring_packed.driver_event->desc_event_flags;
+
+ *event_flags = RING_EVENT_FLAGS_DISABLE;
+}
+
+