netdev - Re: [PATCH 16/16] wl1251: Add sysfs file address for setting permanent mac address

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Message-ID: <20131028083320.63d3259f@nehalam.linuxnetplumber.net>
Date:	Mon, 28 Oct 2013 08:33:20 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Dan Williams <dcbw@...hat.com>,
	Pali Rohár <pali.rohar@...il.com>,
	Luciano Coelho <luca@...lho.fi>,
	"John W. Linville" <linville@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	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
Subject: Re: [PATCH 16/16] wl1251: Add sysfs file address for setting
 permanent mac address

On Mon, 28 Oct 2013 15:56:55 +0100
Johannes Berg <johannes@...solutions.net> wrote:

> On Mon, 2013-10-28 at 09:46 -0500, Dan Williams wrote:
> 
> > If the device doesn't actually *have* a permanent MAC address, then it
> > shouldn't be returning one via ethtool, and should return an error for
> > ETHTOOL_GPERMADDR.
> 
> There's currently no provision for that, but I agree it would be better
> to do so.
> 
> johannes
> 
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The current netdevice API handle the case of a device without a permanent
MAC address, slightly differently.

If device does not have a permanent address,
then:
  1. dev->addr_assign_type should not be NET_ADDR_PERM
  2. when device is registered dev->perm_addr will not be set
     and retain all zeros value
  4. when ethtool gets address it will return all zeros which
     is not a valid address.

This case doesn't seem to be handled threo mac80211 API's



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