netdev - Re: [PATCH] natsemi: make cable length magic configurable

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Message-Id: <20111128.164513.899219888557202127.davem@davemloft.net>
Date:	Mon, 28 Nov 2011 16:45:13 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	jdelvare@...e.de, netdev@...r.kernel.org, thockin@...kin.org,
	okir@...e.de
Subject: Re: [PATCH] natsemi: make cable length magic configurable

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Mon, 28 Nov 2011 17:51:04 +0000

> On Fri, 2011-11-25 at 01:37 -0500, David Miller wrote:
>> From: Jean Delvare <jdelvare@...e.de>
>> Date: Thu, 24 Nov 2011 14:43:59 +0100
>> 
>> > We had a customer report concerning problems with a Natsemi DP83815-D
>> > and long cables. With 100m cables, the network would be essentially dead,
>> > not a single packet would get through either way. We had to apply the
>> > patch below to make it work.
>> 
>> Please do not add new private device driver module knobs.
>> 
>> Instead, add generic flags to the ethtool interface or similar to
>> control device behavior.
> 
> This isn't a generic flag; it seems to be a workaround for a specific
> bug that unfortunately can't be automatic.
> 
> That's why I suggested an ethtool private flag.

Fair enough.
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