[stable 3.13.y] request to include c3caf119

[Chris J Arges]

commit c3caf1192f904de2f1381211f564537235d50de3
Author: Jerry Chu <hkchu at google.com>
Date:   Mon Jul 14 15:54:46 2014 -0700

    net-gre-gro: Fix a bug that breaks the forwarding path

    Fixed a bug that was introduced by my GRE-GRO patch
    (bf5a755f5e9186406bbf50f4087100af5bd68e40 net-gre-gro: Add GRE
    support to the GRO stack) that breaks the forwarding path
    because various GSO related fields were not set. The bug will
    cause on the egress path either the GSO code to fail, or a
    GRE-TSO capable (NETIF_F_GSO_GRE) NICs to choke. The following
    fix has been tested for both cases.

This was already queued for 3.14:
https://lkml.org/lkml/2014/7/26/337

This applies cleanly and I've done a test build on amd64.

--chris j arges