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asm-generic headers: Allow yet more arch overrides in checksum.h

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arches can have more efficient implementation of these routines

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-01-18 15:12:16 +05:30
parent 0a5eae458e
commit 64e69073c3
2 changed files with 6 additions and 0 deletions
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4
include/asm-generic/checksum.h
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@ -38,12 +38,15 @@ extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
csum_partial_copy((src), (dst), (len), (sum))
#endif
#ifndef ip_fast_csum
/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*/
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
#endif
#ifndef csum_fold
/*
* Fold a partial checksum
*/
@ -54,6 +57,7 @@ static inline __sum16 csum_fold(__wsum csum)
sum = (sum & 0xffff) + (sum >> 16);
return (__force __sum16)~sum;
}
#endif
#ifndef csum_tcpudp_nofold
/*

2
lib/checksum.c
View File

@ -102,6 +102,7 @@ static unsigned int do_csum(const unsigned char *buff, int len)
}
#endif
#ifndef ip_fast_csum
/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
@ -111,6 +112,7 @@ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
return (__force __sum16)~do_csum(iph, ihl*4);
}
EXPORT_SYMBOL(ip_fast_csum);
#endif
/*
* computes the checksum of a memory block at buff, length len,