netdev - Re: [PATCH]

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Date:	Thu, 26 Sep 2013 17:44:13 +0200
From:	Nikolay Aleksandrov <nikolay@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Daniel Borkmann <dborkman@...hat.com>, netdev@...r.kernel.org,
	davem@...emloft.net, andy@...yhouse.net, fubar@...ibm.com,
	vfalico@...hat.com
Subject: Re: [PATCH]

On 09/26/2013 05:40 PM, Nikolay Aleksandrov wrote:
> On 09/26/2013 05:27 PM, Eric Dumazet wrote:
>> On Thu, 2013-09-26 at 16:09 +0200, Nikolay Aleksandrov wrote:
>>> Factor out the code that extracts the ports from skb_flow_dissect and
>>> add a new function skb_flow_get_ports which can be re-used.
>>>
>>> Suggested-by: Veaceslav Falico <vfalico@...hat.com>
>>> Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>
>>> ---
>>> v2: new patch
>>> v3: fix a bug in skb_flow_dissect where thoff didn't have poff added by
>>>     modifying thoff directly in skb_flow_get_ports as it's done anyway.
>>>     Also add the necessary export symbol for skb_flow_get_ports.
>>> This seems like a good idea because there're other users that can re-use
>>> it later as well.
>>
>> Wait a minute.... existing code seems buggy.
>>
>> Daniel, any objection if I submit this fix ?
>>
>> (commit 8ed781668dd49b608f)
>>
> 1 question, I might be missing something but proto_ports_offset() gets the SPI
> with that 4 byte offset as is written in the comments, in every other case
> proto_ports_offset() is 0, so why would we want the SPI in the ->ports field ?
> And even then isn't it supposed to be 16 bits (2 bytes) and not 4, since we need
> to pass over "next header" (8 bits) and length (8 bits) ?
> 
Nevermind the second part, I forgot about the 16-bit 0 region :-)

> Thanks,
>  Nik

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