netdev - Re: [RFC] p54: software hot-swap eeprom image

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Message-ID: <87tywpaqdw.fsf@purkki.valot.fi>
Date:	Fri, 20 Nov 2009 22:32:43 +0200
From:	Kalle Valo <kalle.valo@....fi>
To:	Dan Williams <dcbw@...hat.com>
Cc:	Christian Lamparter <chunkeey@...glemail.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC] p54: software hot-swap eeprom image

Dan Williams <dcbw@...hat.com> writes:

> On Fri, 2009-11-20 at 20:27 +0100, Christian Lamparter wrote:
>> This (aggregated) patch adds a new sysfs file "eeprom_overwrite"
>> which can be used to upload an customized eeprom image to the
>> driver during normal operation.

[...]

> Honestly I wonder if this would be better done with ethtool.  There's
> already ethtool --eeprom-dump, would it be so hard to do an ethtool
> --eeprom-load ?
>
> I can see a number of devices doing this, so in my mind it makes sense
> to have a generic facility for this sort of thing.  But then again it's
> not so common an operation and its fraught with danger :)

I think that devices without eeprom at all (eg. stlc4550, most wl1251
and all wl1271 chips) request_firmware() and a udev script is the best
way to go, as they will need the eeprom data from user space during
every boot. This was discussed few months back, but unfortunately I
have yet to seen an implementation of this :) Hopefully I find some
time to try this soon.

But for devices with eeprom, having support in ethtool sounds good to
me.

> Libertas could potentially use this, but libertas has *two* EEPROM
> images that it might need to update. So if ethtool did grow
> --eeprom-load we may want to account for more than one eeprom image.

Makes sense to mee.

-- 
Kalle Valo
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