1 /* 2 * Aug 8, 2011 Bob Pearson with help from Joakim Tjernlund and George Spelvin 3 * cleaned up code to current version of sparse and added the slicing-by-8 4 * algorithm to the closely similar existing slicing-by-4 algorithm. 5 * 6 * Oct 15, 2000 Matt Domsch <Matt_Domsch@dell.com> 7 * Nicer crc32 functions/docs submitted by linux@horizon.com. Thanks! 8 * Code was from the public domain, copyright abandoned. Code was 9 * subsequently included in the kernel, thus was re-licensed under the 10 * GNU GPL v2. 11 * 12 * Oct 12, 2000 Matt Domsch <Matt_Domsch@dell.com> 13 * Same crc32 function was used in 5 other places in the kernel. 14 * I made one version, and deleted the others. 15 * There are various incantations of crc32(). Some use a seed of 0 or ~0. 16 * Some xor at the end with ~0. The generic crc32() function takes 17 * seed as an argument, and doesn't xor at the end. Then individual 18 * users can do whatever they need. 19 * drivers/net/smc9194.c uses seed ~0, doesn't xor with ~0. 20 * fs/jffs2 uses seed 0, doesn't xor with ~0. 21 * fs/partitions/efi.c uses seed ~0, xor's with ~0. 22 * 23 * This source code is licensed under the GNU General Public License, 24 * Version 2. See the file COPYING for more details. 25 */ 26 27 /* see: Documentation/crc32.txt for a description of algorithms */ 28 29 #include <linux/crc32.h> 30 #include <linux/module.h> 31 #include <linux/types.h> 32 #include <linux/sched.h> 33 #include "crc32defs.h" 34 35 #if CRC_LE_BITS > 8 36 # define tole(x) ((__force u32) __constant_cpu_to_le32(x)) 37 #else 38 # define tole(x) (x) 39 #endif 40 41 #if CRC_BE_BITS > 8 42 # define tobe(x) ((__force u32) __constant_cpu_to_be32(x)) 43 #else 44 # define tobe(x) (x) 45 #endif 46 47 #include "crc32table.h" 48 49 MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>"); 50 MODULE_DESCRIPTION("Various CRC32 calculations"); 51 MODULE_LICENSE("GPL"); 52 53 #define GF2_DIM 32 54 55 static u32 gf2_matrix_times(u32 *mat, u32 vec) 56 { 57 u32 sum = 0; 58 59 while (vec) { 60 if (vec & 1) 61 sum ^= *mat; 62 vec >>= 1; 63 mat++; 64 } 65 66 return sum; 67 } 68 69 static void gf2_matrix_square(u32 *square, u32 *mat) 70 { 71 int i; 72 73 for (i = 0; i < GF2_DIM; i++) 74 square[i] = gf2_matrix_times(mat, mat[i]); 75 } 76 77 #if CRC_LE_BITS > 8 || CRC_BE_BITS > 8 78 79 /* implements slicing-by-4 or slicing-by-8 algorithm */ 80 static inline u32 81 crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256]) 82 { 83 # ifdef __LITTLE_ENDIAN 84 # define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8) 85 # define DO_CRC4 (t3[(q) & 255] ^ t2[(q >> 8) & 255] ^ \ 86 t1[(q >> 16) & 255] ^ t0[(q >> 24) & 255]) 87 # define DO_CRC8 (t7[(q) & 255] ^ t6[(q >> 8) & 255] ^ \ 88 t5[(q >> 16) & 255] ^ t4[(q >> 24) & 255]) 89 # else 90 # define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) 91 # define DO_CRC4 (t0[(q) & 255] ^ t1[(q >> 8) & 255] ^ \ 92 t2[(q >> 16) & 255] ^ t3[(q >> 24) & 255]) 93 # define DO_CRC8 (t4[(q) & 255] ^ t5[(q >> 8) & 255] ^ \ 94 t6[(q >> 16) & 255] ^ t7[(q >> 24) & 255]) 95 # endif 96 const u32 *b; 97 size_t rem_len; 98 # ifdef CONFIG_X86 99 size_t i; 100 # endif 101 const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3]; 102 # if CRC_LE_BITS != 32 103 const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7]; 104 # endif 105 u32 q; 106 107 /* Align it */ 108 if (unlikely((long)buf & 3 && len)) { 109 do { 110 DO_CRC(*buf++); 111 } while ((--len) && ((long)buf)&3); 112 } 113 114 # if CRC_LE_BITS == 32 115 rem_len = len & 3; 116 len = len >> 2; 117 # else 118 rem_len = len & 7; 119 len = len >> 3; 120 # endif 121 122 b = (const u32 *)buf; 123 # ifdef CONFIG_X86 124 --b; 125 for (i = 0; i < len; i++) { 126 # else 127 for (--b; len; --len) { 128 # endif 129 q = crc ^ *++b; /* use pre increment for speed */ 130 # if CRC_LE_BITS == 32 131 crc = DO_CRC4; 132 # else 133 crc = DO_CRC8; 134 q = *++b; 135 crc ^= DO_CRC4; 136 # endif 137 } 138 len = rem_len; 139 /* And the last few bytes */ 140 if (len) { 141 u8 *p = (u8 *)(b + 1) - 1; 142 # ifdef CONFIG_X86 143 for (i = 0; i < len; i++) 144 DO_CRC(*++p); /* use pre increment for speed */ 145 # else 146 do { 147 DO_CRC(*++p); /* use pre increment for speed */ 148 } while (--len); 149 # endif 150 } 151 return crc; 152 #undef DO_CRC 153 #undef DO_CRC4 154 #undef DO_CRC8 155 } 156 #endif 157 158 /* For conditions of distribution and use, see copyright notice in zlib.h */ 159 static u32 crc32_generic_combine(u32 crc1, u32 crc2, size_t len2, 160 u32 polynomial) 161 { 162 u32 even[GF2_DIM]; /* Even-power-of-two zeros operator */ 163 u32 odd[GF2_DIM]; /* Odd-power-of-two zeros operator */ 164 u32 row; 165 int i; 166 167 if (len2 <= 0) 168 return crc1; 169 170 /* Put operator for one zero bit in odd */ 171 odd[0] = polynomial; 172 row = 1; 173 for (i = 1; i < GF2_DIM; i++) { 174 odd[i] = row; 175 row <<= 1; 176 } 177 178 gf2_matrix_square(even, odd); /* Put operator for two zero bits in even */ 179 gf2_matrix_square(odd, even); /* Put operator for four zero bits in odd */ 180 181 /* Apply len2 zeros to crc1 (first square will put the operator for one 182 * zero byte, eight zero bits, in even). 183 */ 184 do { 185 /* Apply zeros operator for this bit of len2 */ 186 gf2_matrix_square(even, odd); 187 if (len2 & 1) 188 crc1 = gf2_matrix_times(even, crc1); 189 len2 >>= 1; 190 /* If no more bits set, then done */ 191 if (len2 == 0) 192 break; 193 /* Another iteration of the loop with odd and even swapped */ 194 gf2_matrix_square(odd, even); 195 if (len2 & 1) 196 crc1 = gf2_matrix_times(odd, crc1); 197 len2 >>= 1; 198 } while (len2 != 0); 199 200 crc1 ^= crc2; 201 return crc1; 202 } 203 204 /** 205 * crc32_le_generic() - Calculate bitwise little-endian Ethernet AUTODIN II 206 * CRC32/CRC32C 207 * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for other 208 * uses, or the previous crc32/crc32c value if computing incrementally. 209 * @p: pointer to buffer over which CRC32/CRC32C is run 210 * @len: length of buffer @p 211 * @tab: little-endian Ethernet table 212 * @polynomial: CRC32/CRC32c LE polynomial 213 */ 214 static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p, 215 size_t len, const u32 (*tab)[256], 216 u32 polynomial) 217 { 218 #if CRC_LE_BITS == 1 219 int i; 220 while (len--) { 221 crc ^= *p++; 222 for (i = 0; i < 8; i++) 223 crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0); 224 } 225 # elif CRC_LE_BITS == 2 226 while (len--) { 227 crc ^= *p++; 228 crc = (crc >> 2) ^ tab[0][crc & 3]; 229 crc = (crc >> 2) ^ tab[0][crc & 3]; 230 crc = (crc >> 2) ^ tab[0][crc & 3]; 231 crc = (crc >> 2) ^ tab[0][crc & 3]; 232 } 233 # elif CRC_LE_BITS == 4 234 while (len--) { 235 crc ^= *p++; 236 crc = (crc >> 4) ^ tab[0][crc & 15]; 237 crc = (crc >> 4) ^ tab[0][crc & 15]; 238 } 239 # elif CRC_LE_BITS == 8 240 /* aka Sarwate algorithm */ 241 while (len--) { 242 crc ^= *p++; 243 crc = (crc >> 8) ^ tab[0][crc & 255]; 244 } 245 # else 246 crc = (__force u32) __cpu_to_le32(crc); 247 crc = crc32_body(crc, p, len, tab); 248 crc = __le32_to_cpu((__force __le32)crc); 249 #endif 250 return crc; 251 } 252 253 #if CRC_LE_BITS == 1 254 u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) 255 { 256 return crc32_le_generic(crc, p, len, NULL, CRCPOLY_LE); 257 } 258 u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) 259 { 260 return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE); 261 } 262 #else 263 u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) 264 { 265 return crc32_le_generic(crc, p, len, 266 (const u32 (*)[256])crc32table_le, CRCPOLY_LE); 267 } 268 u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) 269 { 270 return crc32_le_generic(crc, p, len, 271 (const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE); 272 } 273 #endif 274 u32 __pure crc32_le_combine(u32 crc1, u32 crc2, size_t len2) 275 { 276 return crc32_generic_combine(crc1, crc2, len2, CRCPOLY_LE); 277 } 278 279 u32 __pure __crc32c_le_combine(u32 crc1, u32 crc2, size_t len2) 280 { 281 return crc32_generic_combine(crc1, crc2, len2, CRC32C_POLY_LE); 282 } 283 EXPORT_SYMBOL(crc32_le); 284 EXPORT_SYMBOL(crc32_le_combine); 285 EXPORT_SYMBOL(__crc32c_le); 286 EXPORT_SYMBOL(__crc32c_le_combine); 287 288 /** 289 * crc32_be_generic() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32 290 * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for 291 * other uses, or the previous crc32 value if computing incrementally. 292 * @p: pointer to buffer over which CRC32 is run 293 * @len: length of buffer @p 294 * @tab: big-endian Ethernet table 295 * @polynomial: CRC32 BE polynomial 296 */ 297 static inline u32 __pure crc32_be_generic(u32 crc, unsigned char const *p, 298 size_t len, const u32 (*tab)[256], 299 u32 polynomial) 300 { 301 #if CRC_BE_BITS == 1 302 int i; 303 while (len--) { 304 crc ^= *p++ << 24; 305 for (i = 0; i < 8; i++) 306 crc = 307 (crc << 1) ^ ((crc & 0x80000000) ? polynomial : 308 0); 309 } 310 # elif CRC_BE_BITS == 2 311 while (len--) { 312 crc ^= *p++ << 24; 313 crc = (crc << 2) ^ tab[0][crc >> 30]; 314 crc = (crc << 2) ^ tab[0][crc >> 30]; 315 crc = (crc << 2) ^ tab[0][crc >> 30]; 316 crc = (crc << 2) ^ tab[0][crc >> 30]; 317 } 318 # elif CRC_BE_BITS == 4 319 while (len--) { 320 crc ^= *p++ << 24; 321 crc = (crc << 4) ^ tab[0][crc >> 28]; 322 crc = (crc << 4) ^ tab[0][crc >> 28]; 323 } 324 # elif CRC_BE_BITS == 8 325 while (len--) { 326 crc ^= *p++ << 24; 327 crc = (crc << 8) ^ tab[0][crc >> 24]; 328 } 329 # else 330 crc = (__force u32) __cpu_to_be32(crc); 331 crc = crc32_body(crc, p, len, tab); 332 crc = __be32_to_cpu((__force __be32)crc); 333 # endif 334 return crc; 335 } 336 337 #if CRC_LE_BITS == 1 338 u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) 339 { 340 return crc32_be_generic(crc, p, len, NULL, CRCPOLY_BE); 341 } 342 #else 343 u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) 344 { 345 return crc32_be_generic(crc, p, len, 346 (const u32 (*)[256])crc32table_be, CRCPOLY_BE); 347 } 348 #endif 349 EXPORT_SYMBOL(crc32_be); 350 351 #ifdef CONFIG_CRC32_SELFTEST 352 353 /* 4096 random bytes */ 354 static u8 __attribute__((__aligned__(8))) test_buf[] = 355 { 356 0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30, 357 0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4, 358 0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60, 359 0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c, 360 0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4, 361 0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a, 362 0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a, 363 0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4, 364 0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9, 365 0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4, 366 0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca, 367 0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61, 368 0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e, 369 0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a, 370 0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 0x0b, 0x6f, 371 0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd, 372 0xbf, 0xb7, 0xc8, 0x04, 0x94, 0xf8, 0x8b, 0x8c, 373 0xf1, 0xab, 0x7a, 0xd4, 0xdd, 0xf3, 0xe8, 0x88, 374 0xc3, 0xed, 0x17, 0x8a, 0x9b, 0x40, 0x0d, 0x53, 375 0x62, 0x12, 0x03, 0x5f, 0x1b, 0x35, 0x32, 0x1f, 376 0xb4, 0x7b, 0x93, 0x78, 0x0d, 0xdb, 0xce, 0xa4, 377 0xc0, 0x47, 0xd5, 0xbf, 0x68, 0xe8, 0x5d, 0x74, 378 0x8f, 0x8e, 0x75, 0x1c, 0xb2, 0x4f, 0x9a, 0x60, 379 0xd1, 0xbe, 0x10, 0xf4, 0x5c, 0xa1, 0x53, 0x09, 380 0xa5, 0xe0, 0x09, 0x54, 0x85, 0x5c, 0xdc, 0x07, 381 0xe7, 0x21, 0x69, 0x7b, 0x8a, 0xfd, 0x90, 0xf1, 382 0x22, 0xd0, 0xb4, 0x36, 0x28, 0xe6, 0xb8, 0x0f, 383 0x39, 0xde, 0xc8, 0xf3, 0x86, 0x60, 0x34, 0xd2, 384 0x5e, 0xdf, 0xfd, 0xcf, 0x0f, 0xa9, 0x65, 0xf0, 385 0xd5, 0x4d, 0x96, 0x40, 0xe3, 0xdf, 0x3f, 0x95, 386 0x5a, 0x39, 0x19, 0x93, 0xf4, 0x75, 0xce, 0x22, 387 0x00, 0x1c, 0x93, 0xe2, 0x03, 0x66, 0xf4, 0x93, 388 0x73, 0x86, 0x81, 0x8e, 0x29, 0x44, 0x48, 0x86, 389 0x61, 0x7c, 0x48, 0xa3, 0x43, 0xd2, 0x9c, 0x8d, 390 0xd4, 0x95, 0xdd, 0xe1, 0x22, 0x89, 0x3a, 0x40, 391 0x4c, 0x1b, 0x8a, 0x04, 0xa8, 0x09, 0x69, 0x8b, 392 0xea, 0xc6, 0x55, 0x8e, 0x57, 0xe6, 0x64, 0x35, 393 0xf0, 0xc7, 0x16, 0x9f, 0x5d, 0x5e, 0x86, 0x40, 394 0x46, 0xbb, 0xe5, 0x45, 0x88, 0xfe, 0xc9, 0x63, 395 0x15, 0xfb, 0xf5, 0xbd, 0x71, 0x61, 0xeb, 0x7b, 396 0x78, 0x70, 0x07, 0x31, 0x03, 0x9f, 0xb2, 0xc8, 397 0xa7, 0xab, 0x47, 0xfd, 0xdf, 0xa0, 0x78, 0x72, 398 0xa4, 0x2a, 0xe4, 0xb6, 0xba, 0xc0, 0x1e, 0x86, 399 0x71, 0xe6, 0x3d, 0x18, 0x37, 0x70, 0xe6, 0xff, 400 0xe0, 0xbc, 0x0b, 0x22, 0xa0, 0x1f, 0xd3, 0xed, 401 0xa2, 0x55, 0x39, 0xab, 0xa8, 0x13, 0x73, 0x7c, 402 0x3f, 0xb2, 0xd6, 0x19, 0xac, 0xff, 0x99, 0xed, 403 0xe8, 0xe6, 0xa6, 0x22, 0xe3, 0x9c, 0xf1, 0x30, 404 0xdc, 0x01, 0x0a, 0x56, 0xfa, 0xe4, 0xc9, 0x99, 405 0xdd, 0xa8, 0xd8, 0xda, 0x35, 0x51, 0x73, 0xb4, 406 0x40, 0x86, 0x85, 0xdb, 0x5c, 0xd5, 0x85, 0x80, 407 0x14, 0x9c, 0xfd, 0x98, 0xa9, 0x82, 0xc5, 0x37, 408 0xff, 0x32, 0x5d, 0xd0, 0x0b, 0xfa, 0xdc, 0x04, 409 0x5e, 0x09, 0xd2, 0xca, 0x17, 0x4b, 0x1a, 0x8e, 410 0x15, 0xe1, 0xcc, 0x4e, 0x52, 0x88, 0x35, 0xbd, 411 0x48, 0xfe, 0x15, 0xa0, 0x91, 0xfd, 0x7e, 0x6c, 412 0x0e, 0x5d, 0x79, 0x1b, 0x81, 0x79, 0xd2, 0x09, 413 0x34, 0x70, 0x3d, 0x81, 0xec, 0xf6, 0x24, 0xbb, 414 0xfb, 0xf1, 0x7b, 0xdf, 0x54, 0xea, 0x80, 0x9b, 415 0xc7, 0x99, 0x9e, 0xbd, 0x16, 0x78, 0x12, 0x53, 416 0x5e, 0x01, 0xa7, 0x4e, 0xbd, 0x67, 0xe1, 0x9b, 417 0x4c, 0x0e, 0x61, 0x45, 0x97, 0xd2, 0xf0, 0x0f, 418 0xfe, 0x15, 0x08, 0xb7, 0x11, 0x4c, 0xe7, 0xff, 419 0x81, 0x53, 0xff, 0x91, 0x25, 0x38, 0x7e, 0x40, 420 0x94, 0xe5, 0xe0, 0xad, 0xe6, 0xd9, 0x79, 0xb6, 421 0x92, 0xc9, 0xfc, 0xde, 0xc3, 0x1a, 0x23, 0xbb, 422 0xdd, 0xc8, 0x51, 0x0c, 0x3a, 0x72, 0xfa, 0x73, 423 0x6f, 0xb7, 0xee, 0x61, 0x39, 0x03, 0x01, 0x3f, 424 0x7f, 0x94, 0x2e, 0x2e, 0xba, 0x3a, 0xbb, 0xb4, 425 0xfa, 0x6a, 0x17, 0xfe, 0xea, 0xef, 0x5e, 0x66, 426 0x97, 0x3f, 0x32, 0x3d, 0xd7, 0x3e, 0xb1, 0xf1, 427 0x6c, 0x14, 0x4c, 0xfd, 0x37, 0xd3, 0x38, 0x80, 428 0xfb, 0xde, 0xa6, 0x24, 0x1e, 0xc8, 0xca, 0x7f, 429 0x3a, 0x93, 0xd8, 0x8b, 0x18, 0x13, 0xb2, 0xe5, 430 0xe4, 0x93, 0x05, 0x53, 0x4f, 0x84, 0x66, 0xa7, 431 0x58, 0x5c, 0x7b, 0x86, 0x52, 0x6d, 0x0d, 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0x2d, 0x64, 0x72, 0xd4, 836 0x66, 0xdc, 0x10, 0xa6, 0x67, 0xd6, 0x04, 0x23, 837 0x9d, 0x0a, 0x11, 0x77, 0xdd, 0x37, 0x94, 0x17, 838 0x3c, 0xbf, 0x8b, 0x65, 0xb0, 0x2e, 0x5e, 0x66, 839 0x47, 0x64, 0xac, 0xdd, 0xf0, 0x84, 0xfd, 0x39, 840 0xfa, 0x15, 0x5d, 0xef, 0xae, 0xca, 0xc1, 0x36, 841 0xa7, 0x5c, 0xbf, 0xc7, 0x08, 0xc2, 0x66, 0x00, 842 0x74, 0x74, 0x4e, 0x27, 0x3f, 0x55, 0x8a, 0xb7, 843 0x38, 0x66, 0x83, 0x6d, 0xcf, 0x99, 0x9e, 0x60, 844 0x8f, 0xdd, 0x2e, 0x62, 0x22, 0x0e, 0xef, 0x0c, 845 0x98, 0xa7, 0x85, 0x74, 0x3b, 0x9d, 0xec, 0x9e, 846 0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7, 847 0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a, 848 0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d, 849 0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37, 850 0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 0x98, 0x82, 851 0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8, 852 0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e, 853 0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85, 854 0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98, 855 0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22, 856 0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7, 857 0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49, 858 0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33, 859 0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc, 860 0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8, 861 0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f, 862 0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3, 863 0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98, 864 0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c, 865 0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6, 866 0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc, 867 0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d, 868 }; 869 870 /* 100 test cases */ 871 static struct crc_test { 872 u32 crc; /* random starting crc */ 873 u32 start; /* random 6 bit offset in buf */ 874 u32 length; /* random 11 bit length of test */ 875 u32 crc_le; /* expected crc32_le result */ 876 u32 crc_be; /* expected crc32_be result */ 877 u32 crc32c_le; /* expected crc32c_le result */ 878 } test[] = 879 { 880 {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1, 0xf6e93d6c}, 881 {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad, 0x0fe92aca}, 882 {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f, 0x52e1ebb8}, 883 {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a, 0x0798af9a}, 884 {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2, 0x18eb3152}, 885 {0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793, 0xd00d08c7}, 886 {0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed, 0x8ba966bc}, 887 {0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35, 0x11d694a2}, 888 {0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2, 0x6ab3208d}, 889 {0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10, 0xba4603c5}, 890 {0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb, 0xe6071c6f}, 891 {0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0, 0x179ec30a}, 892 {0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb, 0x0903beb8}, 893 {0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed, 0x6a7cb4fa}, 894 {0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591, 0xdb535801}, 895 {0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67, 0x92bed597}, 896 {0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd, 0x192a3f1b}, 897 {0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a, 0xccbaec1a}, 898 {0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b, 0x7eabae4d}, 899 {0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f, 0x28c72982}, 900 {0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d, 0xc3cd4d18}, 901 {0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a, 0xbca8f0e7}, 902 {0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97, 0x713f60b3}, 903 {0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2, 0xebd08fd5}, 904 {0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138, 0x64406c59}, 905 {0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032, 0x7421890e}, 906 {0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f, 0xe9347603}, 907 {0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f, 0x1bef9060}, 908 {0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32, 0x34720072}, 909 {0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef, 0x48310f59}, 910 {0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0, 0x783a4213}, 911 {0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59, 0x9e8efd41}, 912 {0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4, 0xfc3d34a5}, 913 {0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c, 0x17a52ae2}, 914 {0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51, 0x886d935a}, 915 {0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11, 0xeaaeaeb2}, 916 {0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659, 0x8e900a4b}, 917 {0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af, 0xd74662b1}, 918 {0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99, 0xd26752ba}, 919 {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b, 0x8b1fcd62}, 920 {0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521, 0xf54342fe}, 921 {0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3, 0x5b95b988}, 922 {0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d, 0x2e1176be}, 923 {0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f, 0x66120546}, 924 {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b, 0xf256a5cc}, 925 {0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0, 0x4af1dd69}, 926 {0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195, 0x56f0a04a}, 927 {0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d, 0x74f6b6b2}, 928 {0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4, 0x085951fd}, 929 {0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3, 0xc65387eb}, 930 {0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643, 0x1ca9257b}, 931 {0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10, 0xfd196d76}, 932 {0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d, 0x5ef88339}, 933 {0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5, 0x2c3714d9}, 934 {0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b, 0x58576548}, 935 {0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee, 0xfd7c57de}, 936 {0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14, 0xd5fedd59}, 937 {0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a, 0x1cc3b17b}, 938 {0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b, 0x270eed73}, 939 {0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3, 0x91ecbb11}, 940 {0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826, 0x05ed8d0c}, 941 {0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06, 0x0b09ad5b}, 942 {0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35, 0xf8d511fb}, 943 {0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801, 0x5ad832cc}, 944 {0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2, 0x1214d196}, 945 {0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d, 0x5747218a}, 946 {0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c, 0xde8f14de}, 947 {0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba, 0x3563b7b9}, 948 {0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5, 0x071475d0}, 949 {0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b, 0x54c79d60}, 950 {0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178, 0x4c53eee6}, 951 {0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3, 0x10137a3c}, 952 {0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605, 0xaa9d6c73}, 953 {0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1, 0xb63d23e7}, 954 {0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9, 0x7f53e9cf}, 955 {0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78, 0x13c1cd83}, 956 {0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9, 0x49ff5867}, 957 {0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd, 0x8467f211}, 958 {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab, 0x3f9683b2}, 959 {0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb, 0x76a3f874}, 960 {0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77, 0x863b702f}, 961 {0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da, 0xdc6c58ff}, 962 {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39, 0x0622cc95}, 963 {0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16, 0xe85605cd}, 964 {0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208, 0x31da5f06}, 965 {0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e, 0xa1f2e784}, 966 {0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5, 0xb07cc616}, 967 {0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892, 0xbf943b6c}, 968 {0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db, 0x2c01af1c}, 969 {0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43, 0x0fe5f56d}, 970 {0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac, 0xf8943b2d}, 971 {0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7, 0xe4d89272}, 972 {0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2, 0x7c2f6bbb}, 973 {0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2, 0xabbf388b}, 974 {0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640, 0x1dca1f4e}, 975 {0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f, 0x5c170e23}, 976 {0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99, 0xc0e9d672}, 977 {0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7, 0xc18bdc86}, 978 {0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499, 0xa874fcdd}, 979 {0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a, 0x9dc0bb48}, 980 }; 981 982 #include <linux/time.h> 983 984 static int __init crc32c_test(void) 985 { 986 int i; 987 int errors = 0; 988 int bytes = 0; 989 struct timespec start, stop; 990 u64 nsec; 991 unsigned long flags; 992 993 /* keep static to prevent cache warming code from 994 * getting eliminated by the compiler */ 995 static u32 crc; 996 997 /* pre-warm the cache */ 998 for (i = 0; i < 100; i++) { 999 bytes += 2*test[i].length; 1000 1001 crc ^= __crc32c_le(test[i].crc, test_buf + 1002 test[i].start, test[i].length); 1003 } 1004 1005 /* reduce OS noise */ 1006 local_irq_save(flags); 1007 local_irq_disable(); 1008 1009 getnstimeofday(&start); 1010 for (i = 0; i < 100; i++) { 1011 if (test[i].crc32c_le != __crc32c_le(test[i].crc, test_buf + 1012 test[i].start, test[i].length)) 1013 errors++; 1014 } 1015 getnstimeofday(&stop); 1016 1017 local_irq_restore(flags); 1018 local_irq_enable(); 1019 1020 nsec = stop.tv_nsec - start.tv_nsec + 1021 1000000000 * (stop.tv_sec - start.tv_sec); 1022 1023 pr_info("crc32c: CRC_LE_BITS = %d\n", CRC_LE_BITS); 1024 1025 if (errors) 1026 pr_warn("crc32c: %d self tests failed\n", errors); 1027 else { 1028 pr_info("crc32c: self tests passed, processed %d bytes in %lld nsec\n", 1029 bytes, nsec); 1030 } 1031 1032 return 0; 1033 } 1034 1035 static int __init crc32c_combine_test(void) 1036 { 1037 int i, j; 1038 int errors = 0, runs = 0; 1039 1040 for (i = 0; i < 10; i++) { 1041 u32 crc_full; 1042 1043 crc_full = __crc32c_le(test[i].crc, test_buf + test[i].start, 1044 test[i].length); 1045 for (j = 0; j <= test[i].length; ++j) { 1046 u32 crc1, crc2; 1047 u32 len1 = j, len2 = test[i].length - j; 1048 1049 crc1 = __crc32c_le(test[i].crc, test_buf + 1050 test[i].start, len1); 1051 crc2 = __crc32c_le(0, test_buf + test[i].start + 1052 len1, len2); 1053 1054 if (!(crc_full == __crc32c_le_combine(crc1, crc2, len2) && 1055 crc_full == test[i].crc32c_le)) 1056 errors++; 1057 runs++; 1058 cond_resched(); 1059 } 1060 } 1061 1062 if (errors) 1063 pr_warn("crc32c_combine: %d/%d self tests failed\n", errors, runs); 1064 else 1065 pr_info("crc32c_combine: %d self tests passed\n", runs); 1066 1067 return 0; 1068 } 1069 1070 static int __init crc32_test(void) 1071 { 1072 int i; 1073 int errors = 0; 1074 int bytes = 0; 1075 struct timespec start, stop; 1076 u64 nsec; 1077 unsigned long flags; 1078 1079 /* keep static to prevent cache warming code from 1080 * getting eliminated by the compiler */ 1081 static u32 crc; 1082 1083 /* pre-warm the cache */ 1084 for (i = 0; i < 100; i++) { 1085 bytes += 2*test[i].length; 1086 1087 crc ^= crc32_le(test[i].crc, test_buf + 1088 test[i].start, test[i].length); 1089 1090 crc ^= crc32_be(test[i].crc, test_buf + 1091 test[i].start, test[i].length); 1092 } 1093 1094 /* reduce OS noise */ 1095 local_irq_save(flags); 1096 local_irq_disable(); 1097 1098 getnstimeofday(&start); 1099 for (i = 0; i < 100; i++) { 1100 if (test[i].crc_le != crc32_le(test[i].crc, test_buf + 1101 test[i].start, test[i].length)) 1102 errors++; 1103 1104 if (test[i].crc_be != crc32_be(test[i].crc, test_buf + 1105 test[i].start, test[i].length)) 1106 errors++; 1107 } 1108 getnstimeofday(&stop); 1109 1110 local_irq_restore(flags); 1111 local_irq_enable(); 1112 1113 nsec = stop.tv_nsec - start.tv_nsec + 1114 1000000000 * (stop.tv_sec - start.tv_sec); 1115 1116 pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n", 1117 CRC_LE_BITS, CRC_BE_BITS); 1118 1119 if (errors) 1120 pr_warn("crc32: %d self tests failed\n", errors); 1121 else { 1122 pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n", 1123 bytes, nsec); 1124 } 1125 1126 return 0; 1127 } 1128 1129 static int __init crc32_combine_test(void) 1130 { 1131 int i, j; 1132 int errors = 0, runs = 0; 1133 1134 for (i = 0; i < 10; i++) { 1135 u32 crc_full; 1136 1137 crc_full = crc32_le(test[i].crc, test_buf + test[i].start, 1138 test[i].length); 1139 for (j = 0; j <= test[i].length; ++j) { 1140 u32 crc1, crc2; 1141 u32 len1 = j, len2 = test[i].length - j; 1142 1143 crc1 = crc32_le(test[i].crc, test_buf + 1144 test[i].start, len1); 1145 crc2 = crc32_le(0, test_buf + test[i].start + 1146 len1, len2); 1147 1148 if (!(crc_full == crc32_le_combine(crc1, crc2, len2) && 1149 crc_full == test[i].crc_le)) 1150 errors++; 1151 runs++; 1152 cond_resched(); 1153 } 1154 } 1155 1156 if (errors) 1157 pr_warn("crc32_combine: %d/%d self tests failed\n", errors, runs); 1158 else 1159 pr_info("crc32_combine: %d self tests passed\n", runs); 1160 1161 return 0; 1162 } 1163 1164 static int __init crc32test_init(void) 1165 { 1166 crc32_test(); 1167 crc32c_test(); 1168 1169 crc32_combine_test(); 1170 crc32c_combine_test(); 1171 1172 return 0; 1173 } 1174 1175 static void __exit crc32_exit(void) 1176 { 1177 } 1178 1179 module_init(crc32test_init); 1180 module_exit(crc32_exit); 1181 #endif /* CONFIG_CRC32_SELFTEST */ 1182