Re: [net PATCH v3] GRE: Disable segmentation offloads w/ CSUM and we are encapsulated via FOU

[David Miller <davem@davemloft.net>]

From: Alexander Duyck <aduyck@mirantis.com>
Date: Tue, 05 Apr 2016 09:13:39 -0700

> This patch fixes an issue I found in which we were dropping frames if we
> had enabled checksums on GRE headers that were encapsulated by either FOU
> or GUE.  Without this patch I was barely able to get 1 Gb/s of throughput.
> With this patch applied I am now at least getting around 6 Gb/s.
> 
> The issue is due to the fact that with FOU or GUE applied we do not provide
> a transport offset pointing to the GRE header, nor do we offload it in
> software as the GRE header is completely skipped by GSO and treated like a
> VXLAN or GENEVE type header.  As such we need to prevent the stack from
> generating it and also prevent GRE from generating it via any interface we
> create.
> 
> Fixes: c3483384ee511 ("gro: Allow tunnel stacking in the case of FOU/GUE")
> Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
> ---
> 
> v3: Basically the same patch as v1 and v2, but I am cutting it loose from
>     the IPv4 ID patch as that one will likely need to be resolved in
>     net-next.

Applied, thanks Alexander.