linux-kernel - Re: wl1251 & mac address & calibration data

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Message-ID: <20161123222335.GA4788@amd>
Date:   Wed, 23 Nov 2016 23:23:35 +0100
From:   Pavel Machek <pavel@....cz>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Michal Kazior <michal.kazior@...to.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: wl1251 & mac address & calibration data

Hi!

> > > As wl1251.ko does not accept mac_address as module parameter, such
> > > modprobe hook does not help -- as there is absolutely no way from
> > > userspace to set or change (permanent) mac address.
> > 
> > Quoting modprobe.d manual:
> > >       install modulename command...
> > >       
> > >           This command instructs modprobe to run your
> > >           command instead of inserting the module in the
> > >           kernel as normal. The command can be any shell
> > >           command: this allows you to do any kind of
> > >           complex processing you might wish. [...]
> 
> I know. But this do not allow me to send mac address to kernel -- as 
> kernel does not support such command yet (reason for my first
> question).

Plus, this does not really work for cases where wl1251 is not a
module.

> > You can hook up a script that cooks up wl1251-nvs.bin (caldata,
> > macaddr) and then insmod the actual wl1251.ko module. Or you can just
> > cook up the nvs on first device boot and store it in /lib/firmware
> > (possibly overwriting the "generic" wl1251 from linux-firmware).
> 
> This is what I would like to prevent -- overwriting (possible readonly) 
> system files with some device specific. It is really bad idea!

Agreed.

"ifconfig hw ether XX" normally sets the address. I guess that's
ioctl? And I guess we should use similar mechanism for permanent
address.

Best regards,

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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