-/* Attempts to add 'netdev' as a port on 'dpif'. If successful, returns 0 and
- * sets '*port_nop' to the new port's port number (if 'port_nop' is non-null).
- * On failure, returns a positive errno value and sets '*port_nop' to
- * UINT16_MAX (if 'port_nop' is non-null). */
+const char *
+dpif_port_open_type(const char *datapath_type, const char *port_type)
+{
+ struct registered_dpif_class *rc;
+
+ datapath_type = dpif_normalize_type(datapath_type);
+
+ ovs_mutex_lock(&dpif_mutex);
+ rc = shash_find_data(&dpif_classes, datapath_type);
+ if (rc && rc->dpif_class->port_open_type) {
+ port_type = rc->dpif_class->port_open_type(rc->dpif_class, port_type);
+ }
+ ovs_mutex_unlock(&dpif_mutex);
+
+ return port_type;
+}
+
+/* Attempts to add 'netdev' as a port on 'dpif'. If 'port_nop' is
+ * non-null and its value is not ODPP_NONE, then attempts to use the
+ * value as the port number.
+ *
+ * If successful, returns 0 and sets '*port_nop' to the new port's port
+ * number (if 'port_nop' is non-null). On failure, returns a positive
+ * errno value and sets '*port_nop' to ODPP_NONE (if 'port_nop' is
+ * non-null). */