netdev - RE: [RFC] ethtool: Display reg dump length via get driver info.

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Message-ID: <49395329523DD64492581B505F80C86D5A5BCD38EA@EXMAIL.ad.emulex.com>
Date:	Fri, 18 Mar 2011 14:52:16 -0700
From:	<Ajit.Khaparde@...lex.Com>
To:	<bhutchings@...arflare.com>
CC:	<netdev@...r.kernel.org>
Subject: RE: [RFC] ethtool: Display reg dump length via get driver info.

______________________________________
From: Ben Hutchings [bhutchings@...arflare.com]
Sent: Friday, March 18, 2011 4:32 PM
To: Khaparde, Ajit
Cc: netdev@...r.kernel.org
Subject: Re: [RFC] ethtool: Display reg dump length via get driver info.

On Fri, 2011-03-18 at 16:06 -0500, Ajit Khaparde wrote:
>> Devices like BE store Reg Dump Data in the hardware.

> Where else would it be?

Well yes. That's true.

>> This change will allow to just peek into the hardware
>> to see if any data is available for a dump and analysis,
>> without actually dumping the register data.
> [...]

> This is wrong.  ethtool_ops::get_regs_len really should return a
> constant, otherwise ethtool (and the kernel) cannot allocate a buffer of
> the right size.  If the size of a dump really does vary then make it
> return the maximum possible size for the device.

Yes, it is a constant size. And will always be the max size possible.
I just want to see if I can get the length, without really making the ethtoool -d call.
Because that will trigger the dump too.
At that moment, I may not be interested in the data itself.

-Ajit

> Ben.

--
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.--
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