1 /* MN10300 Optimised checksumming code
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
11 #ifndef _ASM_CHECKSUM_H
12 #define _ASM_CHECKSUM_H
14 extern __wsum
csum_partial(const void *buff
, int len
, __wsum sum
);
15 extern __wsum
csum_partial_copy_nocheck(const void *src
, void *dst
,
17 extern __wsum
csum_partial_copy_from_user(const void *src
, void *dst
,
20 extern __sum16
ip_fast_csum(const void *iph
, unsigned int ihl
);
21 extern __wsum
csum_partial(const void *buff
, int len
, __wsum sum
);
22 extern __sum16
ip_compute_csum(const void *buff
, int len
);
24 #define csum_partial_copy_fromuser csum_partial_copy
25 extern __wsum
csum_partial_copy(const void *src
, void *dst
, int len
,
28 static inline __sum16
csum_fold(__wsum sum
)
34 : "r" (sum
<< 16), "0" (sum
& 0xffff0000)
40 static inline __wsum
csum_tcpudp_nofold(__be32 saddr
, __be32 daddr
,
41 __u32 len
, __u8 proto
,
44 __wsum tmp
= (__wsum
)((len
+ proto
) << 8);
52 : "r" (daddr
), "r"(saddr
), "r"(tmp
), "0"(sum
)
59 * computes the checksum of the TCP/UDP pseudo-header
60 * returns a 16-bit checksum, already complemented
62 static inline __sum16
csum_tcpudp_magic(__be32 saddr
, __be32 daddr
,
63 __u32 len
, __u8 proto
,
66 return csum_fold(csum_tcpudp_nofold(saddr
, daddr
, len
, proto
, sum
));
69 #undef _HAVE_ARCH_IPV6_CSUM
72 * Copy and checksum to user
74 #define HAVE_CSUM_COPY_USER
75 extern __wsum
csum_and_copy_to_user(const void *src
, void *dst
, int len
,
76 __wsum sum
, int *err_ptr
);
79 #endif /* _ASM_CHECKSUM_H */