netdev - Re: [PATCH net-next] ipv4: use unlikely to optimise in ip

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Message-ID: <CAJFZqHyYwnBJJonnVRngq7wA6ZnnSUuAGXLbNZnvuuxtjVw_AA@mail.gmail.com>
Date:	Mon, 10 Mar 2014 15:45:48 +0800
From:	RongQing Li <roy.qing.li@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipv4: use unlikely to optimise in ip_forward

Ok, thanks

-R

On Mon, Mar 10, 2014 at 2:03 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Mon, 2014-03-10 at 13:10 +0800, roy.qing.li@...il.com wrote:
>> From: Li RongQing <roy.qing.li@...il.com>
>>
>> The condition that skb->pkt_type is not PACKET_HOST in ip_forward, should never
>> happen, so use unlikely to optimise this check
>>
>> Signed-off-by: Li RongQing <roy.qing.li@...il.com>
>> ---
>>  net/ipv4/ip_forward.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
>> index be8abe7..b82833a 100644
>> --- a/net/ipv4/ip_forward.c
>> +++ b/net/ipv4/ip_forward.c
>> @@ -128,7 +128,7 @@ int ip_forward(struct sk_buff *skb)
>>       struct ip_options *opt  = &(IPCB(skb)->opt);
>>
>>       /* that should never happen */
>> -     if (skb->pkt_type != PACKET_HOST)
>> +     if (unlikely(skb->pkt_type != PACKET_HOST))
>>               goto drop;
>>
>>       if (skb_warn_if_lro(skb))
>
> Compilers already do the right thing.
>
> This is one of the reason you see so many goto in the kernel.
>
>
>
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