linux-kernel - Re: [PATCH v3 13/19] media: dvb_core: slight optimization of addr compare

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Message-ID: <52BC0E56.80003@huawei.com>
Date:	Thu, 26 Dec 2013 19:09:10 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"Mauro Carvalho Chehab" <m.chehab@...sung.com>,
	<linux-media@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 13/19] media: dvb_core: slight optimization of addr
 compare

On 2013/12/25 18:57, Sergei Shtylyov wrote:
> Hello.
> 
> On 25-12-2013 7:29, Ding Tianhong wrote:
> 
>> Use possibly more efficient ether_addr_equal
>> instead of memcmp.
> 
>> Cc: Mauro Carvalho Chehab <m.chehab@...sung.com>
>> Cc: linux-media@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
>> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
>> ---
>>   drivers/media/dvb-core/dvb_net.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
>> diff --git a/drivers/media/dvb-core/dvb_net.c b/drivers/media/dvb-core/dvb_net.c
>> index f91c80c..3dfc33b 100644
>> --- a/drivers/media/dvb-core/dvb_net.c
>> +++ b/drivers/media/dvb-core/dvb_net.c
>> @@ -179,7 +179,7 @@ static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
>>       eth = eth_hdr(skb);
>>
>>       if (*eth->h_dest & 1) {
>> -        if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
>> +        if(ether_addr_equal(eth->h_dest,dev->broadcast))
> 
>    There should be space after comma.
> 
>> @@ -674,11 +674,11 @@ static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
>>                       if (priv->rx_mode != RX_MODE_PROMISC) {
>>                           if (priv->ule_skb->data[0] & 0x01) {
>>                               /* multicast or broadcast */
>> -                            if (memcmp(priv->ule_skb->data, bc_addr, ETH_ALEN)) {
>> +                            if (!ether_addr_equal(priv->ule_skb->data, bc_addr)) {
>>                                   /* multicast */
>>                                   if (priv->rx_mode == RX_MODE_MULTI) {
>>                                       int i;
>> -                                    for(i = 0; i < priv->multi_num && memcmp(priv->ule_skb->data, priv->multi_macs[i], ETH_ALEN); i++)
>> +                                    for(i = 0; i < priv->multi_num && !ether_addr_equal(priv->ule_skb->data, priv->multi_macs[i]); i++)
> 
>    Shouldn't this line be broken?
> 

ok, thanks.

Regards
>>                                           ;
>>                                       if (i == priv->multi_num)
>>                                           drop = 1;
> 
> WBR, Sergei
> 
> 
> 
> 


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