linux-kernel - Re: [PATCH net-next?] pktgen: Use simpler test for non-zero ipv6 address

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Date:	Wed, 10 Oct 2012 14:59:30 -0400
From:	Brian Haley <brian.haley@...com>
To:	Joe Perches <joe@...ches.com>
CC:	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next?] pktgen: Use simpler test for non-zero ipv6
 address

On 10/10/2012 02:42 PM, Joe Perches wrote:
> Found by looking for if (foo) ; tests with a perl regex
> 
> Yes Eric, it could be 2 compares instead of 4 on 64-bit
> systems with HAS_EFFICIENT_UNALIGNED_ACCESS.  Maybe later
> or if there are other tests that could become something
> like ipv6_is_zeronet.
> 
> cheers, Joe
> 
>  net/core/pktgen.c |    9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/net/core/pktgen.c b/net/core/pktgen.c
> index 148e73d..3aa8417 100644
> --- a/net/core/pktgen.c
> +++ b/net/core/pktgen.c
> @@ -2422,11 +2422,10 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
>  		}
>  	} else {		/* IPV6 * */
>  
> -		if (pkt_dev->min_in6_daddr.s6_addr32[0] == 0 &&
> -		    pkt_dev->min_in6_daddr.s6_addr32[1] == 0 &&
> -		    pkt_dev->min_in6_daddr.s6_addr32[2] == 0 &&
> -		    pkt_dev->min_in6_daddr.s6_addr32[3] == 0) ;
> -		else {
> +		if (pkt_dev->min_in6_daddr.s6_addr32[0] |
> +		    pkt_dev->min_in6_daddr.s6_addr32[1] |
> +		    pkt_dev->min_in6_daddr.s6_addr32[2] |
> +		    pkt_dev->min_in6_daddr.s6_addr32[3]) {
>  			int i;

Why not just use ipv6_addr_any() ?  It has an HAS_EFFICIENT_UNALIGNED_ACCESS
check too.

-Brian
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