netdev - Re: [PATCH net-next] gro: relax ID check in inet_gro

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Date:	Thu, 21 Mar 2013 14:37:38 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	David Miller <davem@...emloft.net>
Cc:	maze@...gle.com, dkravkov@...il.com, eric.dumazet@...il.com,
	netdev@...r.kernel.org, dmitry@...adcom.com, eilong@...adcom.com,
	pshelar@...ira.com, hkchu@...gle.com
Subject: Re: [PATCH net-next] gro: relax ID check in inet_gro_receive()

On Thu, Mar 21, 2013 at 2:05 PM, David Miller <davem@...emloft.net> wrote:
> From: Maciej Żenczykowski <maze@...gle.com>
> Date: Thu, 21 Mar 2013 13:47:07 -0700
>
>> They might create non incrementing IP ID packet sequences on the wire,
>> and this may prevent GRO from kicking in, but it does not make TSO
>> non-reversible
>> (if anything it makes it easy to detect that it happened).
>
> This is not an acceptable outcome for any form GSO, it should be
> completely transparent.  The packets we would have output individually
> and those which result from the segmented frame must be
> indistinguishable.

We actually don't set the outer IP ID for GRE packets with the DF bit
set in the non-GSO/TSO case either (and this is not new behavior).
Obviously TCP/IP header compression doesn't apply to the GRE packet
itself.

Therefore, I think if the driver is switched to increment the inner
ID, which it sounds like it can be, then everything should be
transparent.
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