Re: [PATCH 4 0/4] Add ability to set defaultless network device MAC addresses to deterministic computed locally administered values

From: Florian Fainelli <florian@openwrt.org>
To: linux-arm-kernel@lists.infradead.org
Cc: Andy Green <andy@warmcat.com>,
	linux-omap@vger.kernel.org, s-jan@ti.com, arnd@arndb.de,
	patches@linaro.org, tony@atomide.com, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, rostedt@goodmis.org
Subject: Re: [PATCH 4 0/4] Add ability to set defaultless network device MAC addresses to deterministic computed locally administered values
Date: Tue, 10 Jul 2012 14:37:51 +0200	[thread overview]
Message-ID: <201207101437.54877.florian@openwrt.org> (raw)
In-Reply-To: <20120705024259.26317.16000.stgit@build.warmcat.com>

Hi,

Le jeudi 05 juillet 2012 04:44:33, Andy Green a écrit :
> The following series adds some code to generate legal, locally administered
> MAC addresses from OMAP4 CPU Die ID fuse data, and then adds a helper at
> net/ethernet taking care of accepting device path / MAC mapping
> registrations and running a notifier to enforce the requested MAC when the
> matching network device turns up.

This looks like something you can solve by user-space entirely. Expose the 
OMAP4 CPU Die ID using a sysfs attribute, and let user-space manage the MAC 
address pool.

If you tell me you want to use this for nfsroot booting, what prevents you 
from using an initramfs, assign a valid MAC to your interface and switch over 
your nfsroot once the interface setup is done?

> 
> On PandaBoard / ES, two devices have no board-level MAC either assigned by
> the manufacturer or stored on the board, the last patch in the series adds
> these device paths and gets them set when the network device is registered.
> 
> Lastly for convenient testing, there's a little patch on
> omap2plus_defconfig that will get Ethernet and WLAN up on Pandaboard.
> 
> The patches are against today's linux-omap.
> 
> Thanks to Tony Lindgren and Arnd Bergmann for comments leading to the
> helper in net/ethernet.
> 
> ---
> 
> Andy Green (4):
>       OMAP: add cpu id register to MAC address helper
>       NET ethernet introduce mac_platform helper
>       OMAP4 PANDA register ethernet and wlan for automatic mac allocation
>       config test config extending omap2plus with wl12xx etc
> 
> 
>  arch/arm/configs/omap2plus_defconfig   |   35 +++----
>  arch/arm/mach-omap2/Kconfig            |    1
>  arch/arm/mach-omap2/board-omap4panda.c |   30 ++++++
>  arch/arm/mach-omap2/id.c               |   39 ++++++++
>  arch/arm/mach-omap2/include/mach/id.h  |    1
>  include/net/mac-platform.h             |   39 ++++++++
>  net/Kconfig                            |    5 +
>  net/ethernet/Makefile                  |    3 +
>  net/ethernet/mac-platform.c            |  151
> ++++++++++++++++++++++++++++++++ 9 files changed, 282 insertions(+), 22
> deletions(-)
>  create mode 100644 include/net/mac-platform.h
>  create mode 100644 net/ethernet/mac-platform.c
> 
> 
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-- 
Florian