netdev - Re: TCP-MD5 checksum failure on x86

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Message-ID: <884B3D18-4181-4D98-A8FD-8660CE658C0B@guavus.com>
Date:	Mon, 10 May 2010 17:27:28 +0000
From:	Bijay Singh <Bijay.Singh@...vus.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	David Miller <davem@...emloft.net>,
	"<bhaskie@...il.com>" <bhaskie@...il.com>,
	"<bhutchings@...arflare.com>" <bhutchings@...arflare.com>,
	"<netdev@...r.kernel.org>" <netdev@...r.kernel.org>
Subject: Re: TCP-MD5 checksum failure on x86_64 SMP

Hi Eric,

Didn't intend to mix  the issues. It was a hack intended to calm the nerves. I am going to apply the proper patches asap.

About the latest problem of MD5 not working with MTU set to 4470. I noticed this when i needed to change the MTU for some other  purpose. 

Since it was a production box, i have to first set up my box with the right NIC card to reproduce this and try debugging it. In the meantime any ques will  help.

Thanks,
Bijay
 
On 10-May-2010, at 8:48 PM, Eric Dumazet wrote:

> Le lundi 10 mai 2010 à 14:55 +0000, Bijay Singh a écrit :
>> Hi,
>> I had noticed the corruption in the context and actually did what is mentioned.
>> 
>> I allocated the context on the stack and plugged in the md5.c functions. I was able to temporarily solve the problem, all this before I got a response on this thread.
>> 
>> But now I have seeing another problem, when i change the MTU on the interface from 1500 to 4470 none of the message from the peer get thru and I get hash failed message. I am wondering if this is another bug getting hit in this scenario.
> 
> Thats very fine, but you mix very different problems.
> 
> Step by step resolution is required, and clean patches too, because
> plugging md5.c functions is not an option for stable series :)
> 
> Obviously, nobody seriously used TCP-MD5 on linux, but you...
> 
> 
> 

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