linux-kernel - Re: TCP MD5 and Scatter Gather offloading.

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Message-ID: <46A7A54E.4000608@redhat.com>
Date:	Wed, 25 Jul 2007 15:32:30 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Siddharth Taneja <siddharth.taneja@...il.com>
CC:	linux-kernel@...r.kernel.org, Netdev <netdev@...r.kernel.org>
Subject: Re: TCP MD5 and Scatter Gather offloading.

On 07/25/2007 01:12 PM, Siddharth Taneja wrote:

[cc: netdev]

> Hello,
> 
> I am using a vanilla 2.6.22.1 kernel and I see the same kind of
> problem as had been mentioned some time back on this list
> 
> http://lkml.org/lkml/2007/5/22/45
> 
> The issue is essentially that with the MD5 option enabled for the
> specific TCP connection, the SYN and SYN-ACKS are passed fine and the
> connection establishes fine, but the other end (a cisco router)
> complains about incorrect MD5 signatures on any other message that is
> sent after this.
> 
> Setting the scatter-gather offloading option on the NIC seems to
> correct this problem. Recently I had seen a checkin (as a response to
> the problem mentioned in the above link) where the TSO option was
> turned off to make MD5 work (my kernel has that fix). Is a similar
> solution needed here too?
> 
> This is the information about my system:
>> uname -a
> Linux stdalone 2.6.22.1 #1 SMP Mon Jul 23 20:15:21 PDT 2007 i686 i686
> i386 GNU/Linux
> 
>> ethtool -i eth0
> driver: e1000
> version: 7.3.20-k2
> firmware-version: N/A
> bus-info: 0000:01:0a.0
> 
>> ethtool -k eth0
> Offload parameters for eth0:
> rx-checksumming: on
> tx-checksumming: on
> scatter-gather: off
> tcp segmentation offload: off
> 
> Thanks for your help.
> 
> Siddharth
> 
> PS: I would like to be CC'ed on the reply to this email. Thanks.
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