Hi,
the following patch was backported to the following LTS kernels
- >=4.4.29
- >=3.16.35
however it is missing from LTS kernels
- linux-4.1
- linux-3.18
> From fac8e0f579695a3ecbc4d3cac369139d7f819971 Mon Sep 17 00:00:00 2001
> From: Jesse Gross <jesse@xxxxxxxxxx>
> Date: Sat, 19 Mar 2016 09:32:01 -0700
> Subject: [PATCH] tunnels: Don't apply GRO to multiple layers of encapsulation.
>
> When drivers express support for TSO of encapsulated packets, they
> only mean that they can do it for one layer of encapsulation.
> Supporting additional levels would mean updating, at a minimum,
> more IP length fields and they are unaware of this.
>
> No encapsulation device expresses support for handling offloaded
> encapsulated packets, so we won't generate these types of frames
> in the transmit path. However, GRO doesn't have a check for
> multiple levels of encapsulation and will attempt to build them.
>
> UDP tunnel GRO actually does prevent this situation but it only
> handles multiple UDP tunnels stacked on top of each other. This
> generalizes that solution to prevent any kind of tunnel stacking
> that would cause problems.
>
> Fixes: bf5a755f ("net-gre-gro: Add GRE support to the GRO stack")
> Signed-off-by: Jesse Gross <jesse@xxxxxxxxxx>
> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
--
Regards,
Thomas
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