Re: [PATCH 16/16] wl1251: Add sysfs file address for settingpermanent mac address
From: Stephen Hemminger
Date: Mon Oct 28 2013 - 11:33:33 EST
On Mon, 28 Oct 2013 15:56:55 +0100
Johannes Berg <johannes@xxxxxxxxxxxxxxxx> 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.
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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,
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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