+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get number of queue pairs supported by the vDPA device
+ *
+ * @param dev
+ * vDP device pointer
+ * @param queue_num
+ * pointer on where the number of queue is stored
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vdpa_get_queue_num(struct rte_vdpa_device *dev, uint32_t *queue_num);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get the Virtio features supported by the vDPA device
+ *
+ * @param dev
+ * vDP device pointer
+ * @param features
+ * pointer on where the supported features are stored
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vdpa_get_features(struct rte_vdpa_device *dev, uint64_t *features);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get the Vhost-user protocol features supported by the vDPA device
+ *
+ * @param dev
+ * vDP device pointer
+ * @param features
+ * pointer on where the supported protocol features are stored
+ * @return
+ * 0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vdpa_get_protocol_features(struct rte_vdpa_device *dev, uint64_t *features);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Synchronize the used ring from mediated ring to guest, log dirty
+ * page for each writeable buffer, caller should handle the used
+ * ring logging before device stop.
+ *
+ * @param vid
+ * vhost device id
+ * @param qid
+ * vhost queue id
+ * @param vring_m
+ * mediated virtio ring pointer
+ * @return
+ * number of synced used entries on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m);
+