+/**
+ * Get userdata associated with the security session. Device specific metadata
+ * provided would be used to uniquely identify the security session being
+ * referred to. This userdata would be registered while creating the session,
+ * and application can use this to identify the SA etc.
+ *
+ * Device specific metadata would be set in mbuf for inline processed inbound
+ * packets. In addition, the same metadata would be set for IPsec events
+ * reported by rte_eth_event framework.
+ *
+ * @param instance security instance
+ * @param md device-specific metadata
+ *
+ * @return
+ * - On success, userdata
+ * - On failure, NULL
+ */
+void * __rte_experimental
+rte_security_get_userdata(struct rte_security_ctx *instance, uint64_t md);
+