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Ley Foon Taneea95072014-11-06 15:20:00 +08001/*
2 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
3 * Copyright (C) 2004 Microtronix Datacom Ltd.
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9
10#ifndef _ASM_NIOS_CHECKSUM_H
11#define _ASM_NIOS_CHECKSUM_H
12
13/* Take these from lib/checksum.c */
14extern __wsum csum_partial(const void *buff, int len, __wsum sum);
15extern __wsum csum_partial_copy(const void *src, void *dst, int len,
16 __wsum sum);
17extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
18 int len, __wsum sum, int *csum_err);
19#define csum_partial_copy_nocheck(src, dst, len, sum) \
20 csum_partial_copy((src), (dst), (len), (sum))
21
22extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
23extern __sum16 ip_compute_csum(const void *buff, int len);
24
25/*
26 * Fold a partial checksum
27 */
28static inline __sum16 csum_fold(__wsum sum)
29{
30 __asm__ __volatile__(
31 "add %0, %1, %0\n"
32 "cmpltu r8, %0, %1\n"
33 "srli %0, %0, 16\n"
34 "add %0, %0, r8\n"
35 "nor %0, %0, %0\n"
36 : "=r" (sum)
37 : "r" (sum << 16), "0" (sum)
38 : "r8");
39 return (__force __sum16) sum;
40}
41
42/*
43 * computes the checksum of the TCP/UDP pseudo-header
44 * returns a 16-bit checksum, already complemented
45 */
46#define csum_tcpudp_nofold csum_tcpudp_nofold
47static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
Alexander Duyck01cfbad2016-03-11 14:05:34 -080048 __u32 len, __u8 proto,
Ley Foon Taneea95072014-11-06 15:20:00 +080049 __wsum sum)
50{
51 __asm__ __volatile__(
52 "add %0, %1, %0\n"
53 "cmpltu r8, %0, %1\n"
54 "add %0, %0, r8\n" /* add carry */
55 "add %0, %2, %0\n"
56 "cmpltu r8, %0, %2\n"
57 "add %0, %0, r8\n" /* add carry */
58 "add %0, %3, %0\n"
59 "cmpltu r8, %0, %3\n"
60 "add %0, %0, r8\n" /* add carry */
61 : "=r" (sum), "=r" (saddr)
Alexander Duyck01cfbad2016-03-11 14:05:34 -080062 : "r" (daddr), "r" ((len + proto) << 8),
Ley Foon Taneea95072014-11-06 15:20:00 +080063 "0" (sum),
64 "1" (saddr)
65 : "r8");
66
67 return sum;
68}
69
70static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
Alexander Duyck01cfbad2016-03-11 14:05:34 -080071 __u32 len, __u8 proto,
72 __wsum sum)
Ley Foon Taneea95072014-11-06 15:20:00 +080073{
74 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
75}
76
77#endif /* _ASM_NIOS_CHECKSUM_H */