Message-ID: <4C469313.6010807@redhat.com>
Date: Wed, 21 Jul 2010 08:26:27 +0200
From: Harald Hoyer <harald@redhat.com>
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To: David Miller <davem@davemloft.net>
CC: shemminger@vyatta.com, bhutchings@solarflare.com, sassmann@redhat.com,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org, gospo@redhat.com,
        gregory.v.rose@intel.com, alexander.h.duyck@intel.com,
        leedom@chelsio.com
Subject: Re: [PATCH net-next] sysfs: add entry to indicate network interfaces
 with random MAC address
References: <1279636194.2110.45.camel@achroite.uk.solarflarecom.com>	<20100720.131748.51255156.davem@davemloft.net>	<20100720141816.16f0a939@nehalam> <20100720.142045.32697196.davem@davemloft.net>
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On 07/20/2010 11:20 PM, David Miller wrote:
> From: Stephen Hemminger<shemminger@vyatta.com>
> Date: Tue, 20 Jul 2010 14:18:16 -0700
>
>> No one mentioned that the first octet of an Ethernet address already
>> indicates "software generated" Ethernet address. Per the standard,
>> if bit 1 is set it means address is locally assigned.
>>
>> static inline bool is_locally_assigned_ether(const u8 *addr)
>> {
>> 	return (addr[0]&  0x2) != 0;
>> }
>
> W00t!
>
> Indeed, can udev just use that?  :-)

It already does:
see /lib/udev/rules.d/75-persistent-net-generator.rules
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