Commit 64e69073 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

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



arches can have more efficient implementation of these routines

Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 0a5eae45

include/asm-generic/checksum.h

+4 −0
Original line number Diff line number Diff line
@@ -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

/*

lib/checksum.c

+2 −0
Original line number Diff line number Diff line
@@ -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,