Commit | Line | Data |
---|---|---|
1394f032 BW |
1 | #ifndef _BFIN_CHECKSUM_H |
2 | #define _BFIN_CHECKSUM_H | |
3 | ||
4 | /* | |
5 | * MODIFIED FOR BFIN April 30, 2001 akbar.hussain@lineo.com | |
6 | * | |
7 | * computes the checksum of a memory block at buff, length len, | |
8 | * and adds in "sum" (32-bit) | |
9 | * | |
10 | * returns a 32-bit number suitable for feeding into itself | |
11 | * or csum_tcpudp_magic | |
12 | * | |
13 | * this function must be called with even lengths, except | |
14 | * for the last fragment, which may be odd | |
15 | * | |
16 | * it's best to have buff aligned on a 32-bit boundary | |
17 | */ | |
45b3947c | 18 | __wsum csum_partial(const void *buff, int len, __wsum sum); |
1394f032 BW |
19 | |
20 | /* | |
21 | * the same as csum_partial, but copies from src while it | |
22 | * checksums | |
23 | * | |
24 | * here even more important to align src and dst on a 32-bit (or even | |
25 | * better 64-bit) boundary | |
26 | */ | |
27 | ||
45b3947c AV |
28 | __wsum csum_partial_copy(const void *src, void *dst, |
29 | int len, __wsum sum); | |
1394f032 BW |
30 | |
31 | /* | |
32 | * the same as csum_partial_copy, but copies from user space. | |
33 | * | |
34 | * here even more important to align src and dst on a 32-bit (or even | |
35 | * better 64-bit) boundary | |
36 | */ | |
37 | ||
45b3947c AV |
38 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
39 | int len, __wsum sum, int *csum_err); | |
1394f032 BW |
40 | |
41 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ | |
42 | csum_partial_copy((src), (dst), (len), (sum)) | |
43 | ||
45b3947c | 44 | __sum16 ip_fast_csum(unsigned char *iph, unsigned int ihl); |
1394f032 BW |
45 | |
46 | /* | |
47 | * Fold a partial checksum | |
48 | */ | |
49 | ||
45b3947c | 50 | static inline __sum16 csum_fold(__wsum sum) |
1394f032 BW |
51 | { |
52 | while (sum >> 16) | |
53 | sum = (sum & 0xffff) + (sum >> 16); | |
54 | return ((~(sum << 16)) >> 16); | |
55 | } | |
56 | ||
57 | /* | |
58 | * computes the checksum of the TCP/UDP pseudo-header | |
59 | * returns a 16-bit checksum, already complemented | |
60 | */ | |
61 | ||
45b3947c AV |
62 | static inline __wsum |
63 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | |
64 | unsigned short proto, __wsum sum) | |
1394f032 BW |
65 | { |
66 | ||
67 | __asm__ ("%0 = %0 + %1;\n\t" | |
68 | "CC = AC0;\n\t" | |
69 | "if !CC jump 4;\n\t" | |
70 | "%0 = %0 + %4;\n\t" | |
71 | "%0 = %0 + %2;\n\t" | |
72 | "CC = AC0;\n\t" | |
73 | "if !CC jump 4;\n\t" | |
74 | "%0 = %0 + %4;\n\t" | |
75 | "%0 = %0 + %3;\n\t" | |
76 | "CC = AC0;\n\t" | |
77 | "if !CC jump 4;\n\t" | |
78 | "%0 = %0 + %4;\n\t" | |
79 | "NOP;\n\t" | |
80 | : "=d" (sum) | |
81 | : "d" (daddr), "d" (saddr), "d" ((ntohs(len)<<16)+proto*256), "d" (1), "0"(sum)); | |
82 | ||
83 | return (sum); | |
84 | } | |
85 | ||
45b3947c AV |
86 | static inline __sum16 |
87 | csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, | |
88 | unsigned short proto, __wsum sum) | |
1394f032 BW |
89 | { |
90 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); | |
91 | } | |
92 | ||
93 | /* | |
94 | * this routine is used for miscellaneous IP-like checksums, mainly | |
95 | * in icmp.c | |
96 | */ | |
97 | ||
45b3947c | 98 | extern __sum16 ip_compute_csum(const void *buff, int len); |
1394f032 BW |
99 | |
100 | #endif /* _BFIN_CHECKSUM_H */ |