From: Andy Green <andy-/Zus8d0mwwtBDgjK7y7TUQ@public.gmane.org>
To: Roger Quadros <roger.quadros-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
patches-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org
Subject: Re: [RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper
Date: Fri, 18 Mar 2011 09:13:04 +0000 [thread overview]
Message-ID: <4D832220.9030704@linaro.org> (raw)
In-Reply-To: <4D831D4B.8090407-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org>
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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WARNING: multiple messages have this Message-ID (diff)
From: andy@warmcat.com (Andy Green)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper
Date: Fri, 18 Mar 2011 09:13:04 +0000 [thread overview]
Message-ID: <4D832220.9030704@linaro.org> (raw)
In-Reply-To: <4D831D4B.8090407@nokia.com>
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
WARNING: multiple messages have this Message-ID (diff)
From: Andy Green <andy@warmcat.com>
To: Roger Quadros <roger.quadros@nokia.com>
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
patches@linaro.org
Subject: Re: [RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper
Date: Fri, 18 Mar 2011 09:13:04 +0000 [thread overview]
Message-ID: <4D832220.9030704@linaro.org> (raw)
In-Reply-To: <4D831D4B.8090407@nokia.com>
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
next prev parent reply other threads:[~2011-03-18 9:13 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-12 22:50 [RFC PATCH 0/5] OMAP2+ / Panda implementation for async platform_data Andy Green
2011-03-12 22:50 ` Andy Green
2011-03-12 22:50 ` [RFC PATCH 1/5] OMAP2+: Panda introduce async platform data definition Andy Green
2011-03-12 22:50 ` Andy Green
2011-03-13 1:05 ` Greg KH
2011-03-13 1:05 ` Greg KH
2011-03-12 22:50 ` [RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper Andy Green
2011-03-12 22:50 ` Andy Green
2011-03-18 8:34 ` Arnd Bergmann
2011-03-18 8:34 ` Arnd Bergmann
2011-03-18 8:49 ` Andy Green
2011-03-18 8:49 ` Andy Green
2011-03-18 14:37 ` Premi, Sanjeev
2011-03-18 14:37 ` Premi, Sanjeev
[not found] ` <B85A65D85D7EB246BE421B3FB0FBB593024C3B8670-/tLxBxkBPtCIQmiDNMet8wC/G2K4zDHf@public.gmane.org>
2011-03-18 14:47 ` Andy Green
2011-03-18 14:47 ` Andy Green
2011-03-18 14:47 ` Andy Green
[not found] ` <20110312225047.27728.1835.stgit-MbR9/eEqKADKkTgpAXvmkg@public.gmane.org>
2011-03-18 8:52 ` Roger Quadros
2011-03-18 8:52 ` Roger Quadros
2011-03-18 8:52 ` Roger Quadros
[not found] ` <4D831D4B.8090407-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org>
2011-03-18 9:13 ` Andy Green [this message]
2011-03-18 9:13 ` Andy Green
2011-03-18 9:13 ` Andy Green
2011-03-12 22:50 ` [RFC PATCH 3/5] OMAP2+:Common CPU DIE ID reading code reads wrong registers for OMAP4430 Andy Green
2011-03-12 22:50 ` Andy Green
2011-03-14 18:12 ` Tony Lindgren
2011-03-14 18:12 ` Tony Lindgren
2011-03-12 22:51 ` [RFC PATCH 4/5] OMAP2+: Set onboard Ethernet MAC address using unique CPU ID data Andy Green
2011-03-12 22:51 ` Andy Green
[not found] ` <20110312224440.27728.60593.stgit-MbR9/eEqKADKkTgpAXvmkg@public.gmane.org>
2011-03-12 22:51 ` [RFC PATCH 5/5] USBNET: SMSC95XX: if mac set in platform data no need for random one Andy Green
2011-03-12 22:51 ` Andy Green
2011-03-12 22:51 ` Andy Green
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