netdev - Re: [PATCH 03/10] net/fec: add mac field into platform data and consolidate fec_get

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Date:	Thu, 30 Dec 2010 07:29:25 +0200
From:	Baruch Siach <baruch@...s.co.il>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	davem@...emloft.net, gerg@...pgear.com, eric@...rea.com,
	bryan.wu@...onical.com, r64343@...escale.com, B32542@...escale.com,
	u.kleine-koenig@...gutronix.de, lw@...o-electronics.de,
	w.sang@...gutronix.de, s.hauer@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [PATCH 03/10] net/fec: add mac field into platform data and
 consolidate fec_get_mac

Hi Shawn,

On Thu, Dec 30, 2010 at 12:29:00PM +0800, Shawn Guo wrote:
> On Wed, Dec 29, 2010 at 06:05:20PM +0800, Shawn Guo wrote:
> > On Wed, Dec 29, 2010 at 08:53:30AM +0200, Baruch Siach wrote:
> > > Please add netdev@...r.kernel.org to the Cc of all your fec driver 
> > > patches.
> > > 
> > > On Tue, Dec 28, 2010 at 10:55:48PM +0800, Shawn Guo wrote:
> > > > Add mac field into fec_platform_data and consolidate function
> > > > fec_get_mac to get mac address in following order.
> > > > 
> > > >  1) kernel command line fec_mac=xx:xx:xx...
> > > 
> > > In the case of dual MAC that you later add support for, the address which one 
> > > is being set? Is there a way to set both in kernel command line?
> > > 
> > The fec0 gets fec_mac and fec1 gets fec_mac + 1. The following code
> > in function fec_get_mac takes care of it.
> > 
> > 	/* Adjust MAC if using default MAC address */
> > 	if (iap == fec_mac_default)
> > 		dev->dev_addr[ETH_ALEN-1] = fec_mac_default[ETH_ALEN-1] + fep->pdev->id;
> > > Also, instead of inventing another kernel command line parameter, it is 
> > > better IMO to use the module parameters mechanism. The greth NIC driver 
> > > already uses this method for setting MAC address. Look for 'macaddr' in 
> > > drivers/net/greth.c, and the explanation at the beginning of 
> > > Documentation/kernel-parameters.txt.
> > > 
> > Sounds good. Thanks.
> > 
> I just thought this over again. Module parameter might not be
> the best here. fec is usually used to mount nfs during boot,
> which requires a built-in driver other than module.

See the explanation at the beginning of Documentation/kernel-parameters.txt.  
You can give module parameters at the kernel command line.

baruch

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