Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 1 | #ifndef _ASM_POWERPC_CHECKSUM_H |
| 2 | #define _ASM_POWERPC_CHECKSUM_H |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 3 | #ifdef __KERNEL__ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | |
| 5 | /* |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
Anton Blanchard | 7a332b0 | 2013-09-23 12:04:51 +1000 | [diff] [blame] | 12 | #ifdef CONFIG_GENERIC_CSUM |
| 13 | #include <asm-generic/checksum.h> |
| 14 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * computes the checksum of a memory block at buff, length len, |
| 17 | * and adds in "sum" (32-bit) |
| 18 | * |
| 19 | * returns a 32-bit number suitable for feeding into itself |
| 20 | * or csum_tcpudp_magic |
| 21 | * |
| 22 | * this function must be called with even lengths, except |
| 23 | * for the last fragment, which may be odd |
| 24 | * |
| 25 | * it's best to have buff aligned on a 32-bit boundary |
| 26 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 27 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | /* |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 30 | * Computes the checksum of a memory block at src, length len, |
| 31 | * and adds in "sum" (32-bit), while copying the block to dst. |
| 32 | * If an access exception occurs on src or dst, it stores -EFAULT |
| 33 | * to *src_err or *dst_err respectively (if that pointer is not |
| 34 | * NULL), and, for an error on src, zeroes the rest of dst. |
| 35 | * |
| 36 | * Like csum_partial, this must be called with even lengths, |
| 37 | * except for the last fragment. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 39 | extern __wsum csum_partial_copy_generic(const void *src, void *dst, |
| 40 | int len, __wsum sum, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | int *src_err, int *dst_err); |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 42 | |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 43 | #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
| 44 | extern __wsum csum_and_copy_from_user(const void __user *src, void *dst, |
| 45 | int len, __wsum sum, int *err_ptr); |
Anton Blanchard | 8c77391 | 2010-08-02 20:11:36 +0000 | [diff] [blame] | 46 | #define HAVE_CSUM_COPY_USER |
| 47 | extern __wsum csum_and_copy_to_user(const void *src, void __user *dst, |
| 48 | int len, __wsum sum, int *err_ptr); |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 49 | |
| 50 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ |
| 51 | csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL) |
| 52 | |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | /* |
| 55 | * turns a 32-bit partial checksum (e.g. from csum_partial) into a |
| 56 | * 1's complement 16-bit checksum. |
| 57 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 58 | static inline __sum16 csum_fold(__wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
| 60 | unsigned int tmp; |
| 61 | |
| 62 | /* swap the two 16-bit halves of sum */ |
| 63 | __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum)); |
| 64 | /* if there is a carry from adding the two 16-bit halves, |
| 65 | it will carry from the lower half into the upper half, |
| 66 | giving us the correct sum in the upper half. */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 67 | return (__force __sum16)(~((__force u32)sum + tmp) >> 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | } |
| 69 | |
| 70 | /* |
| 71 | * this routine is used for miscellaneous IP-like checksums, mainly |
| 72 | * in icmp.c |
| 73 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 74 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
| 76 | return csum_fold(csum_partial(buff, len, 0)); |
| 77 | } |
| 78 | |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 79 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | unsigned short len, |
| 81 | unsigned short proto, |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 82 | __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 84 | #ifdef __powerpc64__ |
| 85 | unsigned long s = (__force u32)sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 87 | s += (__force u32)saddr; |
| 88 | s += (__force u32)daddr; |
| 89 | s += proto + len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | s += (s >> 32); |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 91 | return (__force __wsum) s; |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 92 | #else |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 93 | __asm__("\n\ |
| 94 | addc %0,%0,%1 \n\ |
| 95 | adde %0,%0,%2 \n\ |
| 96 | adde %0,%0,%3 \n\ |
| 97 | addze %0,%0 \n\ |
| 98 | " |
| 99 | : "=r" (sum) |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 100 | : "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum)); |
| 101 | return sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #endif |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 103 | } |
Anton Blanchard | 7a332b0 | 2013-09-23 12:04:51 +1000 | [diff] [blame] | 104 | |
LEROY Christophe | 92c985f | 2015-05-19 17:18:55 +0200 | [diff] [blame] | 105 | /* |
| 106 | * computes the checksum of the TCP/UDP pseudo-header |
| 107 | * returns a 16-bit checksum, already complemented |
| 108 | */ |
| 109 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
| 110 | unsigned short len, |
| 111 | unsigned short proto, |
| 112 | __wsum sum) |
| 113 | { |
| 114 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
| 115 | } |
| 116 | |
LEROY Christophe | 501c8de | 2015-05-19 17:18:57 +0200 | [diff] [blame] | 117 | #define HAVE_ARCH_CSUM_ADD |
| 118 | static inline __wsum csum_add(__wsum csum, __wsum addend) |
| 119 | { |
| 120 | #ifdef __powerpc64__ |
| 121 | u64 res = (__force u64)csum; |
Christophe Leroy | 5a8847c | 2015-09-22 16:34:34 +0200 | [diff] [blame^] | 122 | #endif |
| 123 | if (__builtin_constant_p(csum) && csum == 0) |
| 124 | return addend; |
| 125 | if (__builtin_constant_p(addend) && addend == 0) |
| 126 | return csum; |
LEROY Christophe | 501c8de | 2015-05-19 17:18:57 +0200 | [diff] [blame] | 127 | |
Christophe Leroy | 5a8847c | 2015-09-22 16:34:34 +0200 | [diff] [blame^] | 128 | #ifdef __powerpc64__ |
LEROY Christophe | 501c8de | 2015-05-19 17:18:57 +0200 | [diff] [blame] | 129 | res += (__force u64)addend; |
| 130 | return (__force __wsum)((u32)res + (res >> 32)); |
| 131 | #else |
| 132 | asm("addc %0,%0,%1;" |
| 133 | "addze %0,%0;" |
Christophe Leroy | 11dfbf5 | 2015-09-22 16:34:21 +0200 | [diff] [blame] | 134 | : "+r" (csum) : "r" (addend) : "xer"); |
LEROY Christophe | 501c8de | 2015-05-19 17:18:57 +0200 | [diff] [blame] | 135 | return csum; |
| 136 | #endif |
| 137 | } |
| 138 | |
Christophe Leroy | 37e08ca | 2015-09-22 16:34:25 +0200 | [diff] [blame] | 139 | /* |
| 140 | * This is a version of ip_compute_csum() optimized for IP headers, |
| 141 | * which always checksum on 4 octet boundaries. ihl is the number |
| 142 | * of 32-bit words and is always >= 5. |
| 143 | */ |
| 144 | static inline __wsum ip_fast_csum_nofold(const void *iph, unsigned int ihl) |
| 145 | { |
| 146 | const u32 *ptr = (const u32 *)iph + 1; |
| 147 | #ifdef __powerpc64__ |
| 148 | unsigned int i; |
| 149 | u64 s = *(const u32 *)iph; |
| 150 | |
| 151 | for (i = 0; i < ihl - 1; i++, ptr++) |
| 152 | s += *ptr; |
| 153 | s += (s >> 32); |
| 154 | return (__force __wsum)s; |
| 155 | #else |
| 156 | __wsum sum, tmp; |
| 157 | |
| 158 | asm("mtctr %3;" |
| 159 | "addc %0,%4,%5;" |
| 160 | "1: lwzu %1, 4(%2);" |
| 161 | "adde %0,%0,%1;" |
| 162 | "bdnz 1b;" |
| 163 | "addze %0,%0;" |
| 164 | : "=r" (sum), "=r" (tmp), "+b" (ptr) |
| 165 | : "r" (ihl - 2), "r" (*(const u32 *)iph), "r" (*ptr) |
| 166 | : "ctr", "xer", "memory"); |
| 167 | |
| 168 | return sum; |
| 169 | #endif |
| 170 | } |
| 171 | |
| 172 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
| 173 | { |
| 174 | return csum_fold(ip_fast_csum_nofold(iph, ihl)); |
| 175 | } |
| 176 | |
Anton Blanchard | 7a332b0 | 2013-09-23 12:04:51 +1000 | [diff] [blame] | 177 | #endif |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 178 | #endif /* __KERNEL__ */ |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 179 | #endif |