netdev - Re: [PATCH] Add eeprom_bad_csum_allow module option to e1000.

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Date:	Tue, 23 Oct 2007 16:40:01 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
CC:	Adam Jackson <ajax@...hat.com>, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] Add eeprom_bad_csum_allow module option to e1000.

Kok, Auke wrote:
> Adam Jackson wrote:
>> On Tue, 2007-10-23 at 09:18 -0700, Kok, Auke wrote:
>>> Adam Jackson wrote:
>>>> When the EEPROM gets corrupted, you can fix it with ethtool, but only if
>>>> the module loads and creates a network device.  But, without this option,
>>>> if the EEPROM is corrupted, the driver will not create a network device.
>>>>
>>>> Signed-off-by: Adam Jackson <ajax@...hat.com>
>>> NAK
>>>
>>> wrong list, not sent to me, and while for e100 I was OK with this patch, for e1000
>>> it really does not make sense to 'just allow' a bad checksum - if your eeprom is
>>> randomly messed up then you cannot just fix it like this anyway.
>> That's strange, I managed to recover an otherwise horked e1000 with it.
>> What should I have done instead?
> 
> 
> Dump the eeprom and send us a copy, plus any and all information to the card,
> system etc.. I realize that you need the patch to actually create it but the
> danger is that people will start using it *without* troubleshooting the real
> issue. In various systems the eeprom checksum failure is actually due to a
> misconfigured powersavings feature and the checksum is really not bad at all, but
> the card just reports random values.
> 
> In any case, this patch should not be merged. We often send it around to users to
> debug their issue in case it involves eeproms, but merging it will just conceal
> the real issue and all of a sudden a flood of people stop reporting *real* issues
> to us.


Sorry, I disagree.  Just as with e100, if there is a clear way the user 
can recover their setup -- and Adam says his was effective -- I don't 
see why we should be denying users the ability to use their own hardware.

	Jeff


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