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

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Message-ID: <52BF5DE9.3060501@cogentembedded.com>
Date:	Sun, 29 Dec 2013 02:25:29 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Ding Tianhong <dthxman@...il.com>,
	Ding Tianhong <dingtianhong@...wei.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

Hello.

On 12/28/2013 06:18 PM, Ding Tianhong wrote:

>>> Use possibly more efficient ether_addr_equal
>>> to instead of memcmp.

>>> Cc: "David S. Miller" <davem@...emloft.net>
>>> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
>>> ---
>>>    drivers/net/ethernet/packetengines/yellowfin.c |   12 ++++++------
>>>    1 files changed, 6 insertions(+), 6 deletions(-)

>>> diff --git a/drivers/net/ethernet/packetengines/yellowfin.c b/drivers/net/ethernet/packetengines/yellowfin.c
>>> index d28593b..b83ac0e 100644
>>> --- a/drivers/net/ethernet/packetengines/yellowfin.c
>>> +++ b/drivers/net/ethernet/packetengines/yellowfin.c
>>> @@ -1097,12 +1097,12 @@ static int yellowfin_rx(struct net_device *dev)
>>>                if (status2 & 0x80) dev->stats.rx_dropped++;
>>>    #ifdef YF_PROTOTYPE        /* Support for prototype hardware errata. */
>>>            } else if ((yp->flags & HasMACAddrBug)  &&
>>> -            memcmp(le32_to_cpu(yp->rx_ring_dma +
>>> -                entry*sizeof(struct yellowfin_desc)),
>>> -                dev->dev_addr, 6) != 0 &&
>>> -            memcmp(le32_to_cpu(yp->rx_ring_dma +
>>> -                entry*sizeof(struct yellowfin_desc)),
>>> -                "\377\377\377\377\377\377", 6) != 0) {
>>> +            !ether_addr_equal(le32_to_cpu(yp->rx_ring_dma +
>>> +                              entry * sizeof(struct yellowfin_desc)),
>>> +                              dev->dev_addr) &&

>>     Previous line was aligned correctly, the above line should start under le32_to_cpu.

>>> +            !ether_addr_equal(le32_to_cpu(yp->rx_ring_dma +
>>> +                              entry * sizeof(struct yellowfin_desc)),

>>     Start the continuation lines under 'yp', please.

>>> +                              "\377\377\377\377\377\377")) {

>>     This line should start under le32_to_cpu.

>> WBR, Sergei


> Hi sergei:
> you mean this way?
> 	!ether_addr_equal(le32_to_cpu(yp->rx_ring_dma +
> 				      entry * sizeof(struct yellowfin_desc)),
> 			  dev->dev_addr) &&
>
> 	!ether_addr_equal(le32_to_cpu(yp->rx_ring_dma +
> 				      entry * sizeof(struct yellowfin_desc)),
> 			  "\377\377\377\377\377\377")) {

    Yes, exactly.

> Regards
> Ding

WBR, Sergei

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