Date:	Tue, 14 Apr 2009 07:35:50 -0700
From:	Yan Seiner <yan@...ner.com>
To:	Gene Heskett <gene.heskett@...izon.net>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	aabdulla@...dia.com
Subject: Re: mcp55 forcedeth woes

Gene Heskett wrote:
> On Monday 13 April 2009, Yan Seiner wrote:
>   
>> Gene Heskett wrote:
>>     
>>> On Monday 13 April 2009, Yan Seiner wrote:
>>>       
>>>> I have a few Asus M2N-SLI deluxe mobos.  These mobos have the MCP55
>>>> chipset and two 1gb ethernet ports.  Occasionally, and for no reason that
>>>> I can figure out, these ports will die.  There are various ways to try
>>>> and fix these; they seem to be about 50% effective, and approach
>>>> something akin to voodoo.
>>>>
>>>> Based on this discussion here:
>>>>
>>>> http://patchwork.kernel.org/patch/16212/
>>>>
>>>> I've gotten the ability to turn the ports on and off somewhat.
>>>>
>>>> For port 0,
>>>>
>>>> ethtool -s eth0 autoneg off speed 10 duplex full
>>>>
>>>> turns on the link, and gets me half-duplex, 10mb/sec. Not much, granted.
>>>>
>>>> ethtool -s eth0 autoneg off speed 100 duplex full
>>>>
>>>> causes the link to go up and down on about a 2 second cycle.
>>>>
>>>> ethtool -s eth0 autoneg on
>>>>
>>>> causes the link to drop.
>>>>
>>>> For port 1, the behavior is similar, except that I can get a stable 100
>>>> mbit connection.
>>>>
>>>> So the problem is in the autoneg code. It's a driver issue as this is
>>>> reported widely to work under windows of various flavors.
>>>>
>>>> I'm running 2.6.29.1; I'm ok with patching and building kernels, but I'm
>>>> not a kernel hacker.
>>>>
>>>> What, if anything, can I provide and do to fix this?
>>>>         
>>> It was in 2.6.29-rc8 or 9 that they finally got the ability to turn them
>>> back on on my identical mobo.  Through most of the 29-rcx series we had
>>> the choice of rebooting with the reset button, or powering everything
>>> associated with the ports down for about 2 minutes so they would forget
>>> they were turned off by a graceful shutdown.  Now they are turned off (and
>>> I've still NDI why) and back on like they are supposed to be.   I called
>>> that a PIMA.
>>>       
>> Yeah, I've been fighting this for a while....  The boards are rock-solid
>> under load, which is why I like them.... But this is a PITA.
>>
>> This board worked fine, then I shutdown and the ports have not come back
>> since.  I'm running 2.6.29.1 - no joy on the ports.
>>
>>     
>
> Shut it down, including removing the power cord, and unplug all ethernet 
> cables attached, give it time to fully discharge all stored power in the caps, 
> at least 30 secs, I usually go make a cup of tea in the microwave, so its 
> about 3 minutes.  Plug everything back in and power it up, they should work 
> again.
>
> However, I've been running 2.6.29.1-rc2, and that has not been a problem, I 
> can see the leds on the ports go plumb dark at it runs the shutdown, and come 
> back on about 15 seconds before the init.d/network script runs as it boots up.
>  
>   
>> I'm building forcedeth from .30-rc1 - we'll see if that helps.
>> Something like 15% of the driver changed, so it's still in very heavy
>> development.
>>     
>
> Wow!  Like you, I'm using forcedeth. 2.6.29.1-rc1 did have a short uptime for 
> forcedeth bug IIRC, but so far, -rc2 has lasted longer than KDE-4.2.1 on this 
> F10 system will, I had an 8 day uptime at first, and I'm in the 5th day again.  
> I killed it the first time screwing with some worthless bluetooth dongles I 
> got from USBGear.  Locked it up tighter than a Nebraska bulls ass in flytime.  
> Had to use the reset button. :(
>   
I followed Gene's advice and got some progress....

port 0 is now fully functional.  Port 1, however, remains in its 
semi-zombie state.  Maybe I'll take the machine off-line longer next 
time.   Maybe I'll sacrifice a black and white chicken at the same time.

I also back-ported 2.9.30-rc1 forcedeth.c to my 2.6.29.1 kernel; no 
difference whatsoever.

One other observation:

On the switch, the status LEDs glow with half-brightness when I enable 
port 1 using ethtool...  This leads me to suspect that the voltage 
levels on the port aren't normal.  Not being a hardware engineer, I have 
no idea what importance this has; I am offering this as an observation.

--Yan

-- 
Yan Seiner 

Support my bid for the 4J School Board.
Visit http://www.seiner.com/schoolboard


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