netdev - Re: tg3 driver upgrade (Linux 2.6.32 -> 3.2) breaks IBM Bladecenter SoL

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Message-ID: <506B3B52.7080001@msgid.tls.msk.ru>
Date:	Tue, 02 Oct 2012 23:06:58 +0400
From:	Michael Tokarev <mjt@....msk.ru>
To:	Ferenc Wagner <wferi@...f.hu>
CC:	Michael Chan <mchan@...adcom.com>, netdev@...r.kernel.org,
	Matt Carlson <mcarlson@...adcom.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-kernel@...r.kernel.org
Subject: Re: tg3 driver upgrade (Linux 2.6.32 -> 3.2) breaks IBM Bladecenter
 SoL

On 02.10.2012 22:49, Ferenc Wagner wrote:
> "Michael Chan" <mchan@...adcom.com> writes:
>> These are the likely fixes:
>>
>> commit cf9ecf4b631f649a964fa611f1a5e8874f2a76db 
>> Author: Matt Carlson <mcarlson@...adcom.com>
>> Date: Mon Nov 28 09:41:03 2011 +0000
>>
>> tg3: Fix TSO CAP for 5704 devs w / ASF enabled
> 
> You are exactly right: cf9ecf4b fixed the premanent SoL breakage
> introduced by dabc5c67.  Looks like ASF utilizes similar technology to
> that of the HS20 BMC.  Thanks for the tip, it greatly reduced our CPU
> wear. :)  It's a pity ethtool -k did not give a hint.  Do you think it's
> possible to work around in 3.2 by eg. fiddling some ethtool setting?

Maybe it's better to push this commit to -stable instead? (the commit
that broke things is part of 3.0 kernel so all current 3.x -stable
kernels are affected)

(Besides, that commit "This patch fixes the problem by revisiting and
reevaluating the decision after tg3_get_eeprom_hw_cfg() is called." -
merely copies a somewhat "twisted" chunk of code into another place,
which does not look optimal)

Thanks,

/mjt
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