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

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Message-ID: <20101230042858.GA20651@freescale.com>
Date:	Thu, 30 Dec 2010 12:29:00 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Baruch Siach <baruch@...s.co.il>
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 Baruch,

On Wed, Dec 29, 2010 at 06:05:20PM +0800, Shawn Guo wrote:
> Hi Baruch,
> 
> On Wed, Dec 29, 2010 at 08:53:30AM +0200, Baruch Siach wrote:
> > Hi Shawn,
> > 
> > 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.

-- 
Regards,
Shawn

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