netdev - Re: [regression] 2.6.37+ commit 0363466866d9.... breaks tcp ipv6

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Message-ID: <4D39E2EC.9020906@xmsnet.nl>
Date:	Fri, 21 Jan 2011 20:47:56 +0100
From:	Hans de Bruin <jmdebruin@...net.nl>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Jesse Gross <jesse@...ira.com>, netdev <netdev@...r.kernel.org>
Subject: Re: [regression] 2.6.37+ commit 0363466866d9.... breaks tcp ipv6

On 01/18/2011 11:03 PM, Eric Dumazet wrote:
> Le mardi 18 janvier 2011 à 22:42 +0100, Hans de Bruin a écrit :
>> On 01/18/2011 09:06 PM, Jesse Gross wrote:

...

> You could try "tcpdump -i eth0 ip6 -v"
>
> I guess you receive frames with bad checksums

While you where staring at the code, I was fooling around with tcpdump. 
And while the problem is fixed, I still have some questions:

Is there tool which shows whether a nic supports ipv6 checksum offload 
or not?

I have captured http traffic (wget http://bootes/) between psion (my git 
tree following laptop) and bootes (something running 2.6.33.7).
Attached is a capture with psion running 2.6.37 and one with this 
morning's git tree. Wat's with the 'chsum ... ( incorrect -> ' lines ?
ifconfig does not show errors on either of the machines.

-- 
Hans

View attachment "dump.bootes.37" of type "text/plain" (3902 bytes)

View attachment "dump.bootes.git" of type "text/plain" (2901 bytes)

View attachment "dump.psion.37" of type "text/plain" (6361 bytes)

View attachment "dump.psion.git" of type "text/plain" (4007 bytes)