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ipv6: Optimize ipv6_change_dsfield(). 

Do not convert endian back and forth.
If the caller uses contant "mask" argument (and most callers do),
we can omit runtime endian conversion here.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2013-01-08 06:47:08 +00:00 committed by David S. Miller
parent 6c40d100ce
commit a0376db0f2
1 changed files with 2 additions and 4 deletions
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6
include/net/dsfield.h
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@ -43,11 +43,9 @@ static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
__u8 value)
{
__u16 tmp;
__be16 *p = (__force __be16 *)ipv6h;
tmp = ntohs(*(__be16 *) ipv6h);
tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4);
*(__be16 *) ipv6h = htons(tmp);
*p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4);
}