/*
- * Copyright (c) 2009, 2010 Nicira Networks.
+ * Copyright (c) 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* The MTU is the maximum size of transmitted (and received) packets, in
* bytes, not including the hardware header; thus, this is typically 1500
- * bytes for Ethernet devices.*/
+ * bytes for Ethernet devices.
+ *
+ * If 'netdev' does not have an MTU (e.g. as some tunnels do not), then
+ * this function should set '*mtup' to INT_MAX. */
int (*get_mtu)(const struct netdev *netdev, int *mtup);
/* Returns the ifindex of 'netdev', if successful, as a positive number.