+ if (error && error != EOPNOTSUPP) {
+ VLOG_WARN_RL(&rl, "failed to retrieve MTU for network device %s: %s",
+ netdev_get_name(netdev), strerror(error));
+ }
+ return error;
+}
+
+/* Sets the MTU of 'netdev'. The MTU is the maximum size of transmitted
+ * (and received) packets, in bytes.
+ *
+ * If successful, returns 0. Returns EOPNOTSUPP if 'netdev' does not have an
+ * MTU (as e.g. some tunnels do not). On other failure, returns a positive
+ * errno value. */
+int
+netdev_set_mtu(const struct netdev *netdev, int mtu)
+{
+ int error = netdev_get_dev(netdev)->netdev_class->set_mtu(netdev, mtu);
+
+ if (error && error != EOPNOTSUPP) {