This source file includes following definitions.
- csum_partial
- csum_partial_copy_from_user
- csum_partial_copy_nocheck
- csum_fold
- ip_fast_csum
- csum_tcpudp_nofold
- csum_tcpudp_magic
- ip_compute_csum
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12 #ifndef _S390_CHECKSUM_H
13 #define _S390_CHECKSUM_H
14
15 #include <linux/uaccess.h>
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29 static inline __wsum
30 csum_partial(const void *buff, int len, __wsum sum)
31 {
32 register unsigned long reg2 asm("2") = (unsigned long) buff;
33 register unsigned long reg3 asm("3") = (unsigned long) len;
34
35 asm volatile(
36 "0: cksm %0,%1\n"
37 " jo 0b\n"
38 : "+d" (sum), "+d" (reg2), "+d" (reg3) : : "cc", "memory");
39 return sum;
40 }
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50 static inline __wsum
51 csum_partial_copy_from_user(const void __user *src, void *dst,
52 int len, __wsum sum,
53 int *err_ptr)
54 {
55 if (unlikely(copy_from_user(dst, src, len)))
56 *err_ptr = -EFAULT;
57 return csum_partial(dst, len, sum);
58 }
59
60
61 static inline __wsum
62 csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
63 {
64 memcpy(dst,src,len);
65 return csum_partial(dst, len, sum);
66 }
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71 static inline __sum16 csum_fold(__wsum sum)
72 {
73 u32 csum = (__force u32) sum;
74
75 csum += (csum >> 16) + (csum << 16);
76 csum >>= 16;
77 return (__force __sum16) ~csum;
78 }
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85 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
86 {
87 return csum_fold(csum_partial(iph, ihl*4, 0));
88 }
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94 static inline __wsum
95 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto,
96 __wsum sum)
97 {
98 __u32 csum = (__force __u32)sum;
99
100 csum += (__force __u32)saddr;
101 if (csum < (__force __u32)saddr)
102 csum++;
103
104 csum += (__force __u32)daddr;
105 if (csum < (__force __u32)daddr)
106 csum++;
107
108 csum += len + proto;
109 if (csum < len + proto)
110 csum++;
111
112 return (__force __wsum)csum;
113 }
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120 static inline __sum16
121 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, __u8 proto,
122 __wsum sum)
123 {
124 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
125 }
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132 static inline __sum16 ip_compute_csum(const void *buff, int len)
133 {
134 return csum_fold(csum_partial(buff, len, 0));
135 }
136
137 #endif
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