linux-kernel - Re: [PATCH v2 15/16] wl1251: Add sysfs file address for setting permanent mac address

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Date:	Tue, 10 Dec 2013 11:49:22 -0600
From:	Dan Williams <dcbw@...hat.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Kalle Valo <kvalo@...rom.com>, Luciano Coelho <luca@...lho.fi>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, freemangordon@....bg,
	aaro.koskinen@....fi, pavel@....cz, sre@...g0.de,
	joni.lapilainen@...il.com,
	Johannes Berg <johannes@...solutions.net>,
	Felipe Contreras <felipe.contreras@...il.com>
Subject: Re: [PATCH v2 15/16] wl1251: Add sysfs file address for setting
 permanent mac address

On Tue, 2013-12-10 at 18:14 +0100, Pali Rohár wrote:
> On Tuesday 10 December 2013 17:10:50 Pali Rohár wrote:
> > On Tuesday 10 December 2013 16:49:23 Kalle Valo wrote:
> > > Pali Rohár <pali.rohar@...il.com> writes:
> > > > Driver wl1251 generating mac address randomly at startup
> > > > and there is no way to set permanent mac address via
> > > > SET_IEEE80211_PERM_ADDR. This patch export sysfs file
> > > > which can set permanent mac address by userspace helper
> > > > program. Patch is needed for devices which do not store
> > > > mac address in internal wl1251 eeprom.
> > > > 
> > > > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> > > 
> > > We have ioctl() command for setting the mac address.
> > 
> > Really? Is there ioctl for setting permanent mac address?
> > Can you show me it?
> 
> Now I looked at it again and I did not found any ioctl for it. 
> There is only ioctl cmd for getting address, not setting it.
> 
> #define SIOCETHTOOL 0x8946
> 
> /* Get permanent hardware address */
> #define ETHTOOL_GPERMADDR 0x00000020

Yeah, because it's supposed to be permanent and unchanging.  Which means
if there was an ioctl for it, that would be contrary to the purpose of a
permanent MAC address.

I realize the N900 stores the WiFi MAC address completely differently
than many other systems, and that's why this sysfs file was created.  I
don't really have a great converged solution for that, other than what
you've currently got, or perhaps adding SPERMADDR to ethtool.  One thing
I *would* like though, is a restriction on the sysfs file such that if
the permanent MAC is already set, it cannot be set again.  Otherwise the
permanent MAC address isn't permanent at all.

Dan


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