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>
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@ -43,11 +43,9 @@ static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
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static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
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static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
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__u8 value)
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__u8 value)
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{
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{
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__u16 tmp;
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__be16 *p = (__force __be16 *)ipv6h;
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tmp = ntohs(*(__be16 *) ipv6h);
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*p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4);
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tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4);
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*(__be16 *) ipv6h = htons(tmp);
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}
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}
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