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Date:	Tue, 13 Nov 2012 18:25:28 -0800
From:	Eric Dumazet <>
To:	Vlad Yasevich <>
Subject: Re: [RFC PATCH 00/13] Always build GSO/GRO functionality into the

On Tue, 2012-11-13 at 20:24 -0500, Vlad Yasevich wrote:
> This patch series is a revision suggested by Eric to solve the problem where
> a host without IPv6 support drops GSO frames from the guest.
> The problem is that GSO/GRO support is per protocol, and when said protocol
> is not loaded or is disabled, packets attempting to go through GSO/GRO code paths
> are dropped.  This causes retransmissions and a two orders of magnitude drop in
> performance.
> Prior attempt to solve the problem simply enabled enough GSO/GRO functionality
> for IPv6 protocol when IPv6 was diabled.  This did not solve the problem when
> the protocol was not build in or was blacklisted.
> To solve the problem, it was suggested that we separate GSO/GRO callback
> registration from packet processing registrations.  That way
> GSO/GRO callbacks can be built into the kernel and always be there.
> This patch series attempts to do just that.
> * Patches 1 and 2 split the GSO/GRO handlers from packet_type and convert
>   to the new structure.
> * Patches 3, 4 and 5 do the same thing for net_protocol structure.
> * The rest of the patches try to incrementally move the IPv6 GSO/GRO
>   code out of the module and into the static kernel build.  Some IPv6
>   helper functions also had to move as well.
> I am currently testing the patches, but if folks could look this over
> and send me any comments, I'd appreciate it.

Seems very nice !

I am just wondering if GSO/GRO is fully enabled at every step ?

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