netdev - Re: [PATCH] ixp4xx: Support the all multicast flag on the NPE devices.

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Date:	Mon, 31 May 2010 18:09:33 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	Krzysztof Halasa <khc@...waw.pl>, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ixp4xx: Support the all multicast flag on the NPE devices.

Richard Cochran writes:
 > On Mon, May 31, 2010 at 04:09:13PM +0200, Krzysztof Halasa wrote:
 > > Looks good, though I'd prefer a bit of "const" and "static" in the
 > > allmulti[] declaration. Would you please repost? TIA.
 > 
 > Okay, here it is.
 > 
 > Thanks,
 > Richard
 > 
 > This patch adds support for the IFF_ALLMULTI flag. Previously only the
 > IFF_PROMISC flag was supported.
 > 
 > Signed-off-by: Richard Cochran <richard.cochran@...cron.at>
 > ---
 >  drivers/net/arm/ixp4xx_eth.c |   11 +++++++++++
 >  1 files changed, 11 insertions(+), 0 deletions(-)
 > 
 > diff --git a/drivers/net/arm/ixp4xx_eth.c b/drivers/net/arm/ixp4xx_eth.c
 > index 6be8b09..42b4361 100644
 > --- a/drivers/net/arm/ixp4xx_eth.c
 > +++ b/drivers/net/arm/ixp4xx_eth.c
 > @@ -739,6 +739,17 @@ static void eth_set_mcast_list(struct net_device *dev)
 >  	struct dev_mc_list *mclist;
 >  	u8 diffs[ETH_ALEN], *addr;
 >  	int i;
 > +	static const u8 allmulti[] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
 > +
 > +	if (dev->flags & IFF_ALLMULTI) {
 > +		for (i = 0; i < ETH_ALEN; i++) {
 > +			__raw_writel(allmulti[i], &port->regs->mcast_addr[i]);
 > +			__raw_writel(allmulti[i], &port->regs->mcast_mask[i]);

Seems a bit excessive to define a lookup table for a computation
that amounts to nothing more than "i ? 0 : 1".

Something like the following would IMO be cleaner:

	if (...) {
		for (...) {
			u8 multi = i ? 0x00 : 0x01;
			__raw_writel(multi, ...);
			...
		}
	}
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