netdev - Re: UDP GRO without Merging

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Message-ID: <20180725105200.tarhvqw7qac3j2el@gauss3.secunet.de>
Date:   Wed, 25 Jul 2018 12:52:00 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Gauvain Roussel-Tarbouriech <gauvain@...anify.com>
CC:     <netdev@...r.kernel.org>
Subject: Re: UDP GRO without Merging

On Wed, Jul 25, 2018 at 11:53:45AM +0200, Gauvain Roussel-Tarbouriech wrote:
> Subject:
> 
> Hello Netdev,
> 
> I am working on WireGuard as part of Google Summer of Code and Jason and
> I are working on adding GRO to WireGuard, on the udp_tunnel side of
> things. The goal is to inform udp_tunnel’s gro_receive that certain
> packets are part of the same flow. Then sometime later, we’d like to
> have a list of those same-flow packets appear in gro_complete. As far as
> I can tell, the API seems well suited for merging packets in
> gro_receive, such that gro_complete only then gets one single merged
> packet. However, we need to receive the entire list of same-flow packets
> in gro_complete, unmerged. Is this possible with the present APIs?

We recently posted a patchset that does this GRO packet chaining.
Not sure if this is exactly what you need, but you can have a look here:

https://www.spinics.net/lists/netdev/msg508093.html

This is implemented as a part of a forward fastpath, but
could be also moved generic code if needed.