netdev - Re: TX offloads for NVGRE (OVS GRE with inner protocol being TEB)

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Date:	Thu, 19 Feb 2015 09:01:16 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	Or Gerlitz <ogerlitz@...lanox.com>
Cc:	Joe Stringer <joestringer@...ira.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: TX offloads for NVGRE (OVS GRE with inner protocol being TEB)

On Thu, Feb 19, 2015 at 6:05 AM, Or Gerlitz <ogerlitz@...lanox.com> wrote:
> Hi,
>
> It seems that the OVS GRE code lacks handling of offloads (e.g to come into
> play with NICs that support NVGRE).
>
> I assume we need to place a call to iptunnel_handle_offloads before invoking
> iptunnel_xmit, agree? so ~the quick patch below should do the work? I wasn't
> sure how to set the value of the 2nd param for iptunnel_handle_offloads().

I don't think that this is the issue. __build_header() calls
gre_handle_offloads() which should do all of this work already.

I did notice that skb_set_inner_protocol() is not being called because
it is in the wrong place in the GRE encapsulation code. It is
currently in ip_gre.c():__gre_xmit(), if that line was moved to
gre_demux.c:gre_build_header() then it would be used by all callers.

One other thing that is potentially an issue for offloads is that all
of the encapsulations call vlan_hwaccel_push_inside() after the
respective handle_offloads code. This doesn't seem right as it could
affect the layer pointers, although it only likely matters in a
minority of cases where the inner MAC pointer is used.
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