linux-kernel - Re: [RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper

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Date:	Fri, 18 Mar 2011 09:13:04 +0000
From:	Andy Green <andy@...mcat.com>
To:	Roger Quadros <roger.quadros@...ia.com>
CC:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	patches@...aro.org
Subject: Re: [RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper

On 03/18/2011 08:52 AM, Somebody in the thread at some point said:

>> +	/* mark it as not multicast and outside official 80211 MAC namespace */
>> +
>> +	mac[0] = (mac[0]&  ~1) | 2;

> so here lies the answer to my question "From where do you get the MAC" :)
>
> Is there a guarantee that this MAC will work in all Ethernet setups?

Yeah it's in 80211 spec.  You have to buy the spec, I can't point you to 
it directly, but here is the wikipedia article showing the structure

http://en.wikipedia.org/wiki/MAC_address#Address_details

the random mac addresses generated by the kernel also use this scheme.

-Andy
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