netdev - VLAN MTU propagation

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Date:	Wed, 08 Oct 2008 14:18:48 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Stephen Hemminger <shemminger@...tta.com>,
	Rick Jones <rick.jones2@...com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: VLAN MTU propagation

How about this patch (still compiling, so untested)?

Its based on Rick's suggestion of using an operational and a desired
MTU. The operational MTU is simply the net_device's MTU and is always
set to the minimum of the lower device's MTU and the desired MTU.
The desired MTU can be changed by configuring a MTU for the VLAN device
manually.

The remaining question is whether we should report the desired MTU to
userspace using the netlink interface, or maybe print a message when
the MTU is limited by the lower device.

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