netdev - Re: How exactly does CHECKSUM

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Message-Id: <20140930.161424.679705969149272577.davem@davemloft.net>
Date:	Tue, 30 Sep 2014 16:14:24 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	Yuval.Mintz@...gic.com, therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: How exactly does CHECKSUM_COMPLETE works?

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 30 Sep 2014 12:37:12 -0700

> On Tue, 2014-09-30 at 12:22 -0700, Eric Dumazet wrote:
>> On Tue, 2014-09-30 at 19:05 +0000, Yuval Mintz wrote:
>> 
>> > Can you pinpoint me to what exactly in the code corrects NAPI_GRO_CB(skb)->csum
>> > by negating the ipv4 part in the ones' complete checksum?
>> > 
>> > E.g., for ipv6 [in ipv6_gro_receive()] I can see that skb_gro_postpull_rcsum() is
>> > called after pulling the ipv6 header [and before proceeding to the next protocol],
>> > but I can't seem to find anything similar to this for ipv4 [in inet_gro_receive()].
>> > 
>> 
>> 
>> IPv4 header is supposed to have a 0 checksum ;)
>> 
> 
> Or if you prefer :

Someone please submit this formally :)
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