+/**
+ * Get guest inflight vring info, including inflight ring and resubmit list.
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param vring
+ * the structure to hold the requested inflight vring info
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
+ struct rte_vhost_ring_inflight *vring);
+
+/**
+ * Set split inflight descriptor.
+ *
+ * This function save descriptors that has been comsumed in available
+ * ring
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param idx
+ * inflight entry index
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
+ uint16_t idx);
+
+/**
+ * Set packed inflight descriptor and get corresponding inflight entry
+ *
+ * This function save descriptors that has been comsumed
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param head
+ * head of descriptors
+ * @param last
+ * last of descriptors
+ * @param inflight_entry
+ * corresponding inflight entry
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_set_inflight_desc_packed(int vid, uint16_t vring_idx,
+ uint16_t head, uint16_t last, uint16_t *inflight_entry);
+
+/**
+ * Save the head of list that the last batch of used descriptors.
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param idx
+ * descriptor entry index
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_set_last_inflight_io_split(int vid,
+ uint16_t vring_idx, uint16_t idx);
+
+/**
+ * Update the inflight free_head, used_idx and used_wrap_counter.
+ *
+ * This function will update status first before updating descriptors
+ * to used
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param head
+ * head of descriptors
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_set_last_inflight_io_packed(int vid,
+ uint16_t vring_idx, uint16_t head);
+
+/**
+ * Clear the split inflight status.
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param last_used_idx
+ * last used idx of used ring
+ * @param idx
+ * inflight entry index
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_clr_inflight_desc_split(int vid, uint16_t vring_idx,
+ uint16_t last_used_idx, uint16_t idx);
+
+/**
+ * Clear the packed inflight status.
+ *
+ * @param vid
+ * vhost device ID
+ * @param vring_idx
+ * vring index
+ * @param head
+ * inflight entry index
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_clr_inflight_desc_packed(int vid, uint16_t vring_idx,
+ uint16_t head);
+