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12#ifndef _S390_CHECKSUM_H
13#define _S390_CHECKSUM_H
14
15#include <linux/uaccess.h>
16#include <linux/in6.h>
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29
30static inline __wsum csum_partial(const void *buff, int len, __wsum sum)
31{
32 union register_pair rp = {
33 .even = (unsigned long) buff,
34 .odd = (unsigned long) len,
35 };
36
37 asm volatile(
38 "0: cksm %[sum],%[rp]\n"
39 " jo 0b\n"
40 : [sum] "+&d" (sum), [rp] "+&d" (rp.pair) : : "cc", "memory");
41 return sum;
42}
43
44
45
46
47static inline __sum16 csum_fold(__wsum sum)
48{
49 u32 csum = (__force u32) sum;
50
51 csum += (csum >> 16) | (csum << 16);
52 csum >>= 16;
53 return (__force __sum16) ~csum;
54}
55
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58
59
60static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
61{
62 __u64 csum = 0;
63 __u32 *ptr = (u32 *)iph;
64
65 csum += *ptr++;
66 csum += *ptr++;
67 csum += *ptr++;
68 csum += *ptr++;
69 ihl -= 4;
70 while (ihl--)
71 csum += *ptr++;
72 csum += (csum >> 32) | (csum << 32);
73 return csum_fold((__force __wsum)(csum >> 32));
74}
75
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79
80static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
81 __u8 proto, __wsum sum)
82{
83 __u64 csum = (__force __u64)sum;
84
85 csum += (__force __u32)saddr;
86 csum += (__force __u32)daddr;
87 csum += len;
88 csum += proto;
89 csum += (csum >> 32) | (csum << 32);
90 return (__force __wsum)(csum >> 32);
91}
92
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96
97static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
98 __u8 proto, __wsum sum)
99{
100 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
101}
102
103
104
105
106static inline __sum16 ip_compute_csum(const void *buff, int len)
107{
108 return csum_fold(csum_partial(buff, len, 0));
109}
110
111#define _HAVE_ARCH_IPV6_CSUM
112static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
113 const struct in6_addr *daddr,
114 __u32 len, __u8 proto, __wsum csum)
115{
116 __u64 sum = (__force __u64)csum;
117
118 sum += (__force __u32)saddr->s6_addr32[0];
119 sum += (__force __u32)saddr->s6_addr32[1];
120 sum += (__force __u32)saddr->s6_addr32[2];
121 sum += (__force __u32)saddr->s6_addr32[3];
122 sum += (__force __u32)daddr->s6_addr32[0];
123 sum += (__force __u32)daddr->s6_addr32[1];
124 sum += (__force __u32)daddr->s6_addr32[2];
125 sum += (__force __u32)daddr->s6_addr32[3];
126 sum += len;
127 sum += proto;
128 sum += (sum >> 32) | (sum << 32);
129 return csum_fold((__force __wsum)(sum >> 32));
130}
131
132#endif
133