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Date: Mon, 3 Mar 2014 10:49:36 +0800
From: Ding Tianhong <dingtianhong@...wei.com>
To: Joe Perches <joe@...ches.com>
CC: Patrick McHardy <kaber@...sh.net>,
"David S. Miller" <davem@...emloft.net>,
Julia Lawall <julia.lawall@...6.fr>,
Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] vlan: use ether_addr_equal_64bits to instead
of ether_addr_equal
On 2014/3/3 9:49, Joe Perches wrote:
> On Mon, 2014-03-03 at 09:14 +0800, Ding Tianhong wrote:
>> Ether_addr_equal_64bits is more efficient than ether_addr_equal, and
>> can be used when each argument is an array within a structure that
>> contains at least two bytes of data beyond the array, so it is safe
>> to use it for vlan.
> []
>> diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
> []
>> @@ -26,7 +26,7 @@ bool vlan_do_receive(struct sk_buff **skbp)
>> /* Our lower layer thinks this is not local, let's make sure.
>> * This allows the VLAN to have a different MAC than the
>> * underlying device, and still route correctly. */
>> - if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
>> + if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
>> skb->pkt_type = PACKET_HOST;
>> }
>
> Hi again Ding
>
> If you do have performance numbers:
>
> The lines above this ether_addr_equal_64 are:
>
> if (skb->pkt_type == PACKET_OTHERHOST) {
> /* Our lower layer thinks this is not local, let's make sure.
> * This allows the VLAN to have a different MAC than the
> * underlying device, and still route correctly. */
> if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
> skb->pkt_type = PACKET_HOST;
> }
>
> Maybe it'd be faster overall to add an unlikely
> to the == test
>
> if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
>
>
>
Sorry, I can't understand it clearly, do you mean that if the skb deliver to the vlan dev,
it is impossible that the pkt_type is PACKET_OTHERHOST at most time?
Regards
Ding
>
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