linux-kernel - Re: [PATCH net-next v2 11/20] net: packetengines: slight optimization of addr

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Date:	Sun, 29 Dec 2013 22:05:26 -0800
From:	Joe Perches <joe@...ches.com>
To:	Ding Tianhong <dingtianhong@...wei.com>
Cc:	Ding Tianhong <dthxman@...il.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2 11/20] net: packetengines: slight
 optimization of addr

On Mon, 2013-12-30 at 10:39 +0800, Ding Tianhong wrote:
> I don't understand packetengine NIC anymore, But I think the change is clearly,
> as your said, the broadcast check is enough here, did you mean that?
> 
> 	!is_broadcast_ether_addr((u8 *)(le32_to_cpu(yp->rx_ring_dma) +
> 						    entry * sizeof(struct yellowfin_desc)))

Not quite.  I meant this could be:

		u8 *addr = (u8 *)(unsigned long)le32_to_cpu(yp->rx_ring_dma) +
							    entry * sizeof(struct yellowfin_desc);

		if (!ether_addr_equal(addr, dev->dev_addr) &&
		    !is_broadcast_ether_addr(addr)) {
			etc...

but again, I think thus hardly matters and could just as well
be left alone.


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