netdev - Re: [PATCH V1 net-next 2/2] net: Add UDP GRO support for vxlan traffic

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Date:	Mon, 6 Jan 2014 08:50:12 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Or Gerlitz <or.gerlitz@...il.com>
Cc:	Or Gerlitz <ogerlitz@...lanox.com>, Jerry Chu <hkchu@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Linux Netdev List <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Yan Burman <yanb@...lanox.com>,
	Shlomo Pongratz <shlomop@...lanox.com>
Subject: Re: [PATCH V1 net-next 2/2] net: Add UDP GRO support for vxlan traffic

On Mon, Jan 6, 2014 at 8:38 AM, Or Gerlitz <or.gerlitz@...il.com> wrote:
> On Mon, Jan 6, 2014 at 3:32 PM, Or Gerlitz <or.gerlitz@...il.com> wrote:
>> As the GUE RFC states, with UDP encapsulation, the encap protocol is
>> actually derived from the UDP destination port. With that assumption
>> at hand, we can have the udp gro code to export callbacks for upper
>> uncapsulation protocol to install a gro handler which has the
>> following trivial strucure:
>>
>> key = <PORT>  data = <gro receive/complete callbacks>
>
>> which plugs nicely into the general framework of the gro stack. The
>> udp gro receive code would act as follows
>> -- if there's no gro handler set for the packet udp dest port, flush
>> - do the normal loop to find match on the packet dest/src udp ports
>> - call the protocol (e.g VXLAN) gro receive callback
>> This would avoid dealing with sockets etc and be very efficient, makes sense?
>
> Or in short -- the destination udp port takes a similar role to the
> ethertype for gro l3 handlers or the ip protocol for gro l4 handlers
> and we enable encapsulating protocols to plug into the existing
> offload_callbacks framework, simple.

I think this would be a good start. We can further optimize the encap
path later on.
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