[PATCH net] ibmveth: Fix max MTU limit

[David Miller]

From: Thomas Falcon <tlfalcon at linux.ibm.com>
Date: Thu, 18 Jun 2020 10:43:46 -0500

> The max MTU limit defined for ibmveth is not accounting for
> virtual ethernet buffer overhead, which is twenty-two additional
> bytes set aside for the ethernet header and eight additional bytes
> of an opaque handle reserved for use by the hypervisor. Update the
> max MTU to reflect this overhead.
> 
> Signed-off-by: Thomas Falcon <tlfalcon at linux.ibm.com>

Applied with Fixes: tags added and queued up for -stable.

Thank you.