diff options
author | Michal Simek <monstr@monstr.eu> | 2009-03-27 09:25:22 -0400 |
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committer | Michal Simek <monstr@monstr.eu> | 2009-03-27 09:25:22 -0400 |
commit | f11e044b449c0534cd2de3465f68925f68190866 (patch) | |
tree | b475507d088ace2ab799df0e3f0665ba713d52a4 /arch/microblaze/include | |
parent | 322ae8eb91c1730728400c5b8dd1108aef1205b8 (diff) |
microblaze_v8: checksum support
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/include')
-rw-r--r-- | arch/microblaze/include/asm/checksum.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/checksum.h b/arch/microblaze/include/asm/checksum.h new file mode 100644 index 000000000000..92b30762ce59 --- /dev/null +++ b/arch/microblaze/include/asm/checksum.h | |||
@@ -0,0 +1,98 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2008 Michal Simek <monstr@monstr.eu> | ||
3 | * Copyright (C) 2006 Atmark Techno, Inc. | ||
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_MICROBLAZE_CHECKSUM_H | ||
11 | #define _ASM_MICROBLAZE_CHECKSUM_H | ||
12 | |||
13 | #include <linux/in6.h> | ||
14 | |||
15 | /* | ||
16 | * computes the checksum of the TCP/UDP pseudo-header | ||
17 | * returns a 16-bit checksum, already complemented | ||
18 | */ | ||
19 | static inline __wsum | ||
20 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | ||
21 | unsigned short proto, __wsum sum) | ||
22 | { | ||
23 | __asm__("add %0, %0, %1\n\t" | ||
24 | "addc %0, %0, %2\n\t" | ||
25 | "addc %0, %0, %3\n\t" | ||
26 | "addc %0, %0, r0\n\t" | ||
27 | : "+&d" (sum) | ||
28 | : "d" (saddr), "d" (daddr), "d" (len + proto)); | ||
29 | |||
30 | return sum; | ||
31 | } | ||
32 | |||
33 | /* | ||
34 | * computes the checksum of a memory block at buff, length len, | ||
35 | * and adds in "sum" (32-bit) | ||
36 | * | ||
37 | * returns a 32-bit number suitable for feeding into itself | ||
38 | * or csum_tcpudp_magic | ||
39 | * | ||
40 | * this function must be called with even lengths, except | ||
41 | * for the last fragment, which may be odd | ||
42 | * | ||
43 | * it's best to have buff aligned on a 32-bit boundary | ||
44 | */ | ||
45 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); | ||
46 | |||
47 | /* | ||
48 | * the same as csum_partial, but copies from src while it | ||
49 | * checksums | ||
50 | * | ||
51 | * here even more important to align src and dst on a 32-bit (or even | ||
52 | * better 64-bit) boundary | ||
53 | */ | ||
54 | extern __wsum csum_partial_copy(const char *src, char *dst, int len, int sum); | ||
55 | |||
56 | /* | ||
57 | * the same as csum_partial_copy, but copies from user space. | ||
58 | * | ||
59 | * here even more important to align src and dst on a 32-bit (or even | ||
60 | * better 64-bit) boundary | ||
61 | */ | ||
62 | extern __wsum csum_partial_copy_from_user(const char *src, char *dst, | ||
63 | int len, int sum, int *csum_err); | ||
64 | |||
65 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ | ||
66 | csum_partial_copy((src), (dst), (len), (sum)) | ||
67 | |||
68 | /* | ||
69 | * This is a version of ip_compute_csum() optimized for IP headers, | ||
70 | * which always checksum on 4 octet boundaries. | ||
71 | * | ||
72 | */ | ||
73 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); | ||
74 | |||
75 | /* | ||
76 | * Fold a partial checksum | ||
77 | */ | ||
78 | static inline __sum16 csum_fold(unsigned int sum) | ||
79 | { | ||
80 | sum = (sum & 0xffff) + (sum >> 16); | ||
81 | sum = (sum & 0xffff) + (sum >> 16); | ||
82 | return ~sum; | ||
83 | } | ||
84 | |||
85 | static inline __sum16 | ||
86 | csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, | ||
87 | unsigned short proto, __wsum sum) | ||
88 | { | ||
89 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); | ||
90 | } | ||
91 | |||
92 | /* | ||
93 | * this routine is used for miscellaneous IP-like checksums, mainly | ||
94 | * in icmp.c | ||
95 | */ | ||
96 | extern __sum16 ip_compute_csum(const unsigned char *buff, int len); | ||
97 | |||
98 | #endif /* _ASM_MICROBLAZE_CHECKSUM_H */ | ||