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) 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) 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 #if CRC_LE_BITS > 8 || CRC_BE_BITS > 8 54 55 /* implements slicing-by-4 or slicing-by-8 algorithm */ 56 static inline u32 __pure 57 crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256]) 58 { 59 # ifdef __LITTLE_ENDIAN 60 # define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8) 61 # define DO_CRC4 (t3[(q) & 255] ^ t2[(q >> 8) & 255] ^ \ 62 t1[(q >> 16) & 255] ^ t0[(q >> 24) & 255]) 63 # define DO_CRC8 (t7[(q) & 255] ^ t6[(q >> 8) & 255] ^ \ 64 t5[(q >> 16) & 255] ^ t4[(q >> 24) & 255]) 65 # else 66 # define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) 67 # define DO_CRC4 (t0[(q) & 255] ^ t1[(q >> 8) & 255] ^ \ 68 t2[(q >> 16) & 255] ^ t3[(q >> 24) & 255]) 69 # define DO_CRC8 (t4[(q) & 255] ^ t5[(q >> 8) & 255] ^ \ 70 t6[(q >> 16) & 255] ^ t7[(q >> 24) & 255]) 71 # endif 72 const u32 *b; 73 size_t rem_len; 74 # ifdef CONFIG_X86 75 size_t i; 76 # endif 77 const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3]; 78 # if CRC_LE_BITS != 32 79 const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7]; 80 # endif 81 u32 q; 82 83 /* Align it */ 84 if (unlikely((long)buf & 3 && len)) { 85 do { 86 DO_CRC(*buf++); 87 } while ((--len) && ((long)buf)&3); 88 } 89 90 # if CRC_LE_BITS == 32 91 rem_len = len & 3; 92 len = len >> 2; 93 # else 94 rem_len = len & 7; 95 len = len >> 3; 96 # endif 97 98 b = (const u32 *)buf; 99 # ifdef CONFIG_X86 100 --b; 101 for (i = 0; i < len; i++) { 102 # else 103 for (--b; len; --len) { 104 # endif 105 q = crc ^ *++b; /* use pre increment for speed */ 106 # if CRC_LE_BITS == 32 107 crc = DO_CRC4; 108 # else 109 crc = DO_CRC8; 110 q = *++b; 111 crc ^= DO_CRC4; 112 # endif 113 } 114 len = rem_len; 115 /* And the last few bytes */ 116 if (len) { 117 u8 *p = (u8 *)(b + 1) - 1; 118 # ifdef CONFIG_X86 119 for (i = 0; i < len; i++) 120 DO_CRC(*++p); /* use pre increment for speed */ 121 # else 122 do { 123 DO_CRC(*++p); /* use pre increment for speed */ 124 } while (--len); 125 # endif 126 } 127 return crc; 128 #undef DO_CRC 129 #undef DO_CRC4 130 #undef DO_CRC8 131 } 132 #endif 133 134 135 /** 136 * crc32_le_generic() - Calculate bitwise little-endian Ethernet AUTODIN II 137 * CRC32/CRC32C 138 * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for other 139 * uses, or the previous crc32/crc32c value if computing incrementally. 140 * @p: pointer to buffer over which CRC32/CRC32C is run 141 * @len: length of buffer @p 142 * @tab: little-endian Ethernet table 143 * @polynomial: CRC32/CRC32c LE polynomial 144 */ 145 static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p, 146 size_t len, const u32 (*tab)[256], 147 u32 polynomial) 148 { 149 #if CRC_LE_BITS == 1 150 int i; 151 while (len--) { 152 crc ^= *p++; 153 for (i = 0; i < 8; i++) 154 crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0); 155 } 156 # elif CRC_LE_BITS == 2 157 while (len--) { 158 crc ^= *p++; 159 crc = (crc >> 2) ^ tab[0][crc & 3]; 160 crc = (crc >> 2) ^ tab[0][crc & 3]; 161 crc = (crc >> 2) ^ tab[0][crc & 3]; 162 crc = (crc >> 2) ^ tab[0][crc & 3]; 163 } 164 # elif CRC_LE_BITS == 4 165 while (len--) { 166 crc ^= *p++; 167 crc = (crc >> 4) ^ tab[0][crc & 15]; 168 crc = (crc >> 4) ^ tab[0][crc & 15]; 169 } 170 # elif CRC_LE_BITS == 8 171 /* aka Sarwate algorithm */ 172 while (len--) { 173 crc ^= *p++; 174 crc = (crc >> 8) ^ tab[0][crc & 255]; 175 } 176 # else 177 crc = (__force u32) __cpu_to_le32(crc); 178 crc = crc32_body(crc, p, len, tab); 179 crc = __le32_to_cpu((__force __le32)crc); 180 #endif 181 return crc; 182 } 183 184 #if CRC_LE_BITS == 1 185 u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) 186 { 187 return crc32_le_generic(crc, p, len, NULL, CRCPOLY_LE); 188 } 189 u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) 190 { 191 return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE); 192 } 193 #else 194 u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) 195 { 196 return crc32_le_generic(crc, p, len, 197 (const u32 (*)[256])crc32table_le, CRCPOLY_LE); 198 } 199 u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) 200 { 201 return crc32_le_generic(crc, p, len, 202 (const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE); 203 } 204 #endif 205 EXPORT_SYMBOL(crc32_le); 206 EXPORT_SYMBOL(__crc32c_le); 207 208 /* 209 * This multiplies the polynomials x and y modulo the given modulus. 210 * This follows the "little-endian" CRC convention that the lsbit 211 * represents the highest power of x, and the msbit represents x^0. 212 */ 213 static u32 __attribute_const__ gf2_multiply(u32 x, u32 y, u32 modulus) 214 { 215 u32 product = x & 1 ? y : 0; 216 int i; 217 218 for (i = 0; i < 31; i++) { 219 product = (product >> 1) ^ (product & 1 ? modulus : 0); 220 x >>= 1; 221 product ^= x & 1 ? y : 0; 222 } 223 224 return product; 225 } 226 227 /** 228 * crc32_generic_shift - Append len 0 bytes to crc, in logarithmic time 229 * @crc: The original little-endian CRC (i.e. lsbit is x^31 coefficient) 230 * @len: The number of bytes. @crc is multiplied by x^(8*@len) 231 * @polynomial: The modulus used to reduce the result to 32 bits. 232 * 233 * It's possible to parallelize CRC computations by computing a CRC 234 * over separate ranges of a buffer, then summing them. 235 * This shifts the given CRC by 8*len bits (i.e. produces the same effect 236 * as appending len bytes of zero to the data), in time proportional 237 * to log(len). 238 */ 239 static u32 __attribute_const__ crc32_generic_shift(u32 crc, size_t len, 240 u32 polynomial) 241 { 242 u32 power = polynomial; /* CRC of x^32 */ 243 int i; 244 245 /* Shift up to 32 bits in the simple linear way */ 246 for (i = 0; i < 8 * (int)(len & 3); i++) 247 crc = (crc >> 1) ^ (crc & 1 ? polynomial : 0); 248 249 len >>= 2; 250 if (!len) 251 return crc; 252 253 for (;;) { 254 /* "power" is x^(2^i), modulo the polynomial */ 255 if (len & 1) 256 crc = gf2_multiply(crc, power, polynomial); 257 258 len >>= 1; 259 if (!len) 260 break; 261 262 /* Square power, advancing to x^(2^(i+1)) */ 263 power = gf2_multiply(power, power, polynomial); 264 } 265 266 return crc; 267 } 268 269 u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len) 270 { 271 return crc32_generic_shift(crc, len, CRCPOLY_LE); 272 } 273 274 u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len) 275 { 276 return crc32_generic_shift(crc, len, CRC32C_POLY_LE); 277 } 278 EXPORT_SYMBOL(crc32_le_shift); 279 EXPORT_SYMBOL(__crc32c_le_shift); 280 281 /** 282 * crc32_be_generic() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32 283 * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for 284 * other uses, or the previous crc32 value if computing incrementally. 285 * @p: pointer to buffer over which CRC32 is run 286 * @len: length of buffer @p 287 * @tab: big-endian Ethernet table 288 * @polynomial: CRC32 BE polynomial 289 */ 290 static inline u32 __pure crc32_be_generic(u32 crc, unsigned char const *p, 291 size_t len, const u32 (*tab)[256], 292 u32 polynomial) 293 { 294 #if CRC_BE_BITS == 1 295 int i; 296 while (len--) { 297 crc ^= *p++ << 24; 298 for (i = 0; i < 8; i++) 299 crc = 300 (crc << 1) ^ ((crc & 0x80000000) ? polynomial : 301 0); 302 } 303 # elif CRC_BE_BITS == 2 304 while (len--) { 305 crc ^= *p++ << 24; 306 crc = (crc << 2) ^ tab[0][crc >> 30]; 307 crc = (crc << 2) ^ tab[0][crc >> 30]; 308 crc = (crc << 2) ^ tab[0][crc >> 30]; 309 crc = (crc << 2) ^ tab[0][crc >> 30]; 310 } 311 # elif CRC_BE_BITS == 4 312 while (len--) { 313 crc ^= *p++ << 24; 314 crc = (crc << 4) ^ tab[0][crc >> 28]; 315 crc = (crc << 4) ^ tab[0][crc >> 28]; 316 } 317 # elif CRC_BE_BITS == 8 318 while (len--) { 319 crc ^= *p++ << 24; 320 crc = (crc << 8) ^ tab[0][crc >> 24]; 321 } 322 # else 323 crc = (__force u32) __cpu_to_be32(crc); 324 crc = crc32_body(crc, p, len, tab); 325 crc = __be32_to_cpu((__force __be32)crc); 326 # endif 327 return crc; 328 } 329 330 #if CRC_LE_BITS == 1 331 u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) 332 { 333 return crc32_be_generic(crc, p, len, NULL, CRCPOLY_BE); 334 } 335 #else 336 u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) 337 { 338 return crc32_be_generic(crc, p, len, 339 (const u32 (*)[256])crc32table_be, CRCPOLY_BE); 340 } 341 #endif 342 EXPORT_SYMBOL(crc32_be); 343 344 #ifdef CONFIG_CRC32_SELFTEST 345 346 /* 4096 random bytes */ 347 static u8 const __aligned(8) test_buf[] __initconst = 348 { 349 0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30, 350 0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4, 351 0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60, 352 0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c, 353 0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4, 354 0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a, 355 0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a, 356 0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4, 357 0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9, 358 0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4, 359 0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca, 360 0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61, 361 0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e, 362 0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a, 363 0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 0x0b, 0x6f, 364 0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd, 365 0xbf, 0xb7, 0xc8, 0x04, 0x94, 0xf8, 0x8b, 0x8c, 366 0xf1, 0xab, 0x7a, 0xd4, 0xdd, 0xf3, 0xe8, 0x88, 367 0xc3, 0xed, 0x17, 0x8a, 0x9b, 0x40, 0x0d, 0x53, 368 0x62, 0x12, 0x03, 0x5f, 0x1b, 0x35, 0x32, 0x1f, 369 0xb4, 0x7b, 0x93, 0x78, 0x0d, 0xdb, 0xce, 0xa4, 370 0xc0, 0x47, 0xd5, 0xbf, 0x68, 0xe8, 0x5d, 0x74, 371 0x8f, 0x8e, 0x75, 0x1c, 0xb2, 0x4f, 0x9a, 0x60, 372 0xd1, 0xbe, 0x10, 0xf4, 0x5c, 0xa1, 0x53, 0x09, 373 0xa5, 0xe0, 0x09, 0x54, 0x85, 0x5c, 0xdc, 0x07, 374 0xe7, 0x21, 0x69, 0x7b, 0x8a, 0xfd, 0x90, 0xf1, 375 0x22, 0xd0, 0xb4, 0x36, 0x28, 0xe6, 0xb8, 0x0f, 376 0x39, 0xde, 0xc8, 0xf3, 0x86, 0x60, 0x34, 0xd2, 377 0x5e, 0xdf, 0xfd, 0xcf, 0x0f, 0xa9, 0x65, 0xf0, 378 0xd5, 0x4d, 0x96, 0x40, 0xe3, 0xdf, 0x3f, 0x95, 379 0x5a, 0x39, 0x19, 0x93, 0xf4, 0x75, 0xce, 0x22, 380 0x00, 0x1c, 0x93, 0xe2, 0x03, 0x66, 0xf4, 0x93, 381 0x73, 0x86, 0x81, 0x8e, 0x29, 0x44, 0x48, 0x86, 382 0x61, 0x7c, 0x48, 0xa3, 0x43, 0xd2, 0x9c, 0x8d, 383 0xd4, 0x95, 0xdd, 0xe1, 0x22, 0x89, 0x3a, 0x40, 384 0x4c, 0x1b, 0x8a, 0x04, 0xa8, 0x09, 0x69, 0x8b, 385 0xea, 0xc6, 0x55, 0x8e, 0x57, 0xe6, 0x64, 0x35, 386 0xf0, 0xc7, 0x16, 0x9f, 0x5d, 0x5e, 0x86, 0x40, 387 0x46, 0xbb, 0xe5, 0x45, 0x88, 0xfe, 0xc9, 0x63, 388 0x15, 0xfb, 0xf5, 0xbd, 0x71, 0x61, 0xeb, 0x7b, 389 0x78, 0x70, 0x07, 0x31, 0x03, 0x9f, 0xb2, 0xc8, 390 0xa7, 0xab, 0x47, 0xfd, 0xdf, 0xa0, 0x78, 0x72, 391 0xa4, 0x2a, 0xe4, 0xb6, 0xba, 0xc0, 0x1e, 0x86, 392 0x71, 0xe6, 0x3d, 0x18, 0x37, 0x70, 0xe6, 0xff, 393 0xe0, 0xbc, 0x0b, 0x22, 0xa0, 0x1f, 0xd3, 0xed, 394 0xa2, 0x55, 0x39, 0xab, 0xa8, 0x13, 0x73, 0x7c, 395 0x3f, 0xb2, 0xd6, 0x19, 0xac, 0xff, 0x99, 0xed, 396 0xe8, 0xe6, 0xa6, 0x22, 0xe3, 0x9c, 0xf1, 0x30, 397 0xdc, 0x01, 0x0a, 0x56, 0xfa, 0xe4, 0xc9, 0x99, 398 0xdd, 0xa8, 0xd8, 0xda, 0x35, 0x51, 0x73, 0xb4, 399 0x40, 0x86, 0x85, 0xdb, 0x5c, 0xd5, 0x85, 0x80, 400 0x14, 0x9c, 0xfd, 0x98, 0xa9, 0x82, 0xc5, 0x37, 401 0xff, 0x32, 0x5d, 0xd0, 0x0b, 0xfa, 0xdc, 0x04, 402 0x5e, 0x09, 0xd2, 0xca, 0x17, 0x4b, 0x1a, 0x8e, 403 0x15, 0xe1, 0xcc, 0x4e, 0x52, 0x88, 0x35, 0xbd, 404 0x48, 0xfe, 0x15, 0xa0, 0x91, 0xfd, 0x7e, 0x6c, 405 0x0e, 0x5d, 0x79, 0x1b, 0x81, 0x79, 0xd2, 0x09, 406 0x34, 0x70, 0x3d, 0x81, 0xec, 0xf6, 0x24, 0xbb, 407 0xfb, 0xf1, 0x7b, 0xdf, 0x54, 0xea, 0x80, 0x9b, 408 0xc7, 0x99, 0x9e, 0xbd, 0x16, 0x78, 0x12, 0x53, 409 0x5e, 0x01, 0xa7, 0x4e, 0xbd, 0x67, 0xe1, 0x9b, 410 0x4c, 0x0e, 0x61, 0x45, 0x97, 0xd2, 0xf0, 0x0f, 411 0xfe, 0x15, 0x08, 0xb7, 0x11, 0x4c, 0xe7, 0xff, 412 0x81, 0x53, 0xff, 0x91, 0x25, 0x38, 0x7e, 0x40, 413 0x94, 0xe5, 0xe0, 0xad, 0xe6, 0xd9, 0x79, 0xb6, 414 0x92, 0xc9, 0xfc, 0xde, 0xc3, 0x1a, 0x23, 0xbb, 415 0xdd, 0xc8, 0x51, 0x0c, 0x3a, 0x72, 0xfa, 0x73, 416 0x6f, 0xb7, 0xee, 0x61, 0x39, 0x03, 0x01, 0x3f, 417 0x7f, 0x94, 0x2e, 0x2e, 0xba, 0x3a, 0xbb, 0xb4, 418 0xfa, 0x6a, 0x17, 0xfe, 0xea, 0xef, 0x5e, 0x66, 419 0x97, 0x3f, 0x32, 0x3d, 0xd7, 0x3e, 0xb1, 0xf1, 420 0x6c, 0x14, 0x4c, 0xfd, 0x37, 0xd3, 0x38, 0x80, 421 0xfb, 0xde, 0xa6, 0x24, 0x1e, 0xc8, 0xca, 0x7f, 422 0x3a, 0x93, 0xd8, 0x8b, 0x18, 0x13, 0xb2, 0xe5, 423 0xe4, 0x93, 0x05, 0x53, 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0x10, 0x8d, 0x2f, 0x63, 0x4a, 0xa7, 0x57, 828 0x3a, 0x51, 0xd6, 0x32, 0x2d, 0x64, 0x72, 0xd4, 829 0x66, 0xdc, 0x10, 0xa6, 0x67, 0xd6, 0x04, 0x23, 830 0x9d, 0x0a, 0x11, 0x77, 0xdd, 0x37, 0x94, 0x17, 831 0x3c, 0xbf, 0x8b, 0x65, 0xb0, 0x2e, 0x5e, 0x66, 832 0x47, 0x64, 0xac, 0xdd, 0xf0, 0x84, 0xfd, 0x39, 833 0xfa, 0x15, 0x5d, 0xef, 0xae, 0xca, 0xc1, 0x36, 834 0xa7, 0x5c, 0xbf, 0xc7, 0x08, 0xc2, 0x66, 0x00, 835 0x74, 0x74, 0x4e, 0x27, 0x3f, 0x55, 0x8a, 0xb7, 836 0x38, 0x66, 0x83, 0x6d, 0xcf, 0x99, 0x9e, 0x60, 837 0x8f, 0xdd, 0x2e, 0x62, 0x22, 0x0e, 0xef, 0x0c, 838 0x98, 0xa7, 0x85, 0x74, 0x3b, 0x9d, 0xec, 0x9e, 839 0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7, 840 0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a, 841 0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d, 842 0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37, 843 0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 0x98, 0x82, 844 0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8, 845 0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e, 846 0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85, 847 0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98, 848 0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22, 849 0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7, 850 0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49, 851 0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33, 852 0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc, 853 0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8, 854 0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f, 855 0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3, 856 0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98, 857 0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c, 858 0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6, 859 0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc, 860 0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d, 861 }; 862 863 /* 100 test cases */ 864 static struct crc_test { 865 u32 crc; /* random starting crc */ 866 u32 start; /* random 6 bit offset in buf */ 867 u32 length; /* random 11 bit length of test */ 868 u32 crc_le; /* expected crc32_le result */ 869 u32 crc_be; /* expected crc32_be result */ 870 u32 crc32c_le; /* expected crc32c_le result */ 871 } const test[] __initconst = 872 { 873 {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1, 0xf6e93d6c}, 874 {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad, 0x0fe92aca}, 875 {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f, 0x52e1ebb8}, 876 {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a, 0x0798af9a}, 877 {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2, 0x18eb3152}, 878 {0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793, 0xd00d08c7}, 879 {0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed, 0x8ba966bc}, 880 {0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35, 0x11d694a2}, 881 {0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2, 0x6ab3208d}, 882 {0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10, 0xba4603c5}, 883 {0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb, 0xe6071c6f}, 884 {0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0, 0x179ec30a}, 885 {0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb, 0x0903beb8}, 886 {0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed, 0x6a7cb4fa}, 887 {0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591, 0xdb535801}, 888 {0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67, 0x92bed597}, 889 {0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd, 0x192a3f1b}, 890 {0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a, 0xccbaec1a}, 891 {0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b, 0x7eabae4d}, 892 {0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f, 0x28c72982}, 893 {0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d, 0xc3cd4d18}, 894 {0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a, 0xbca8f0e7}, 895 {0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97, 0x713f60b3}, 896 {0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2, 0xebd08fd5}, 897 {0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138, 0x64406c59}, 898 {0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032, 0x7421890e}, 899 {0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f, 0xe9347603}, 900 {0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f, 0x1bef9060}, 901 {0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32, 0x34720072}, 902 {0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef, 0x48310f59}, 903 {0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0, 0x783a4213}, 904 {0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59, 0x9e8efd41}, 905 {0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4, 0xfc3d34a5}, 906 {0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c, 0x17a52ae2}, 907 {0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51, 0x886d935a}, 908 {0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11, 0xeaaeaeb2}, 909 {0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659, 0x8e900a4b}, 910 {0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af, 0xd74662b1}, 911 {0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99, 0xd26752ba}, 912 {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b, 0x8b1fcd62}, 913 {0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521, 0xf54342fe}, 914 {0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3, 0x5b95b988}, 915 {0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d, 0x2e1176be}, 916 {0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f, 0x66120546}, 917 {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b, 0xf256a5cc}, 918 {0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0, 0x4af1dd69}, 919 {0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195, 0x56f0a04a}, 920 {0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d, 0x74f6b6b2}, 921 {0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4, 0x085951fd}, 922 {0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3, 0xc65387eb}, 923 {0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643, 0x1ca9257b}, 924 {0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10, 0xfd196d76}, 925 {0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d, 0x5ef88339}, 926 {0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5, 0x2c3714d9}, 927 {0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b, 0x58576548}, 928 {0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee, 0xfd7c57de}, 929 {0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14, 0xd5fedd59}, 930 {0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a, 0x1cc3b17b}, 931 {0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b, 0x270eed73}, 932 {0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3, 0x91ecbb11}, 933 {0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826, 0x05ed8d0c}, 934 {0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06, 0x0b09ad5b}, 935 {0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35, 0xf8d511fb}, 936 {0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801, 0x5ad832cc}, 937 {0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2, 0x1214d196}, 938 {0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d, 0x5747218a}, 939 {0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c, 0xde8f14de}, 940 {0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba, 0x3563b7b9}, 941 {0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5, 0x071475d0}, 942 {0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b, 0x54c79d60}, 943 {0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178, 0x4c53eee6}, 944 {0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3, 0x10137a3c}, 945 {0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605, 0xaa9d6c73}, 946 {0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1, 0xb63d23e7}, 947 {0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9, 0x7f53e9cf}, 948 {0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78, 0x13c1cd83}, 949 {0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9, 0x49ff5867}, 950 {0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd, 0x8467f211}, 951 {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab, 0x3f9683b2}, 952 {0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb, 0x76a3f874}, 953 {0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77, 0x863b702f}, 954 {0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da, 0xdc6c58ff}, 955 {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39, 0x0622cc95}, 956 {0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16, 0xe85605cd}, 957 {0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208, 0x31da5f06}, 958 {0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e, 0xa1f2e784}, 959 {0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5, 0xb07cc616}, 960 {0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892, 0xbf943b6c}, 961 {0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db, 0x2c01af1c}, 962 {0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43, 0x0fe5f56d}, 963 {0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac, 0xf8943b2d}, 964 {0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7, 0xe4d89272}, 965 {0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2, 0x7c2f6bbb}, 966 {0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2, 0xabbf388b}, 967 {0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640, 0x1dca1f4e}, 968 {0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f, 0x5c170e23}, 969 {0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99, 0xc0e9d672}, 970 {0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7, 0xc18bdc86}, 971 {0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499, 0xa874fcdd}, 972 {0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a, 0x9dc0bb48}, 973 }; 974 975 #include <linux/time.h> 976 977 static int __init crc32c_test(void) 978 { 979 int i; 980 int errors = 0; 981 int bytes = 0; 982 u64 nsec; 983 unsigned long flags; 984 985 /* keep static to prevent cache warming code from 986 * getting eliminated by the compiler */ 987 static u32 crc; 988 989 /* pre-warm the cache */ 990 for (i = 0; i < 100; i++) { 991 bytes += 2*test[i].length; 992 993 crc ^= __crc32c_le(test[i].crc, test_buf + 994 test[i].start, test[i].length); 995 } 996 997 /* reduce OS noise */ 998 local_irq_save(flags); 999 local_irq_disable(); 1000 1001 nsec = ktime_get_ns(); 1002 for (i = 0; i < 100; i++) { 1003 if (test[i].crc32c_le != __crc32c_le(test[i].crc, test_buf + 1004 test[i].start, test[i].length)) 1005 errors++; 1006 } 1007 nsec = ktime_get_ns() - nsec; 1008 1009 local_irq_restore(flags); 1010 local_irq_enable(); 1011 1012 pr_info("crc32c: CRC_LE_BITS = %d\n", CRC_LE_BITS); 1013 1014 if (errors) 1015 pr_warn("crc32c: %d self tests failed\n", errors); 1016 else { 1017 pr_info("crc32c: self tests passed, processed %d bytes in %lld nsec\n", 1018 bytes, nsec); 1019 } 1020 1021 return 0; 1022 } 1023 1024 static int __init crc32c_combine_test(void) 1025 { 1026 int i, j; 1027 int errors = 0, runs = 0; 1028 1029 for (i = 0; i < 10; i++) { 1030 u32 crc_full; 1031 1032 crc_full = __crc32c_le(test[i].crc, test_buf + test[i].start, 1033 test[i].length); 1034 for (j = 0; j <= test[i].length; ++j) { 1035 u32 crc1, crc2; 1036 u32 len1 = j, len2 = test[i].length - j; 1037 1038 crc1 = __crc32c_le(test[i].crc, test_buf + 1039 test[i].start, len1); 1040 crc2 = __crc32c_le(0, test_buf + test[i].start + 1041 len1, len2); 1042 1043 if (!(crc_full == __crc32c_le_combine(crc1, crc2, len2) && 1044 crc_full == test[i].crc32c_le)) 1045 errors++; 1046 runs++; 1047 cond_resched(); 1048 } 1049 } 1050 1051 if (errors) 1052 pr_warn("crc32c_combine: %d/%d self tests failed\n", errors, runs); 1053 else 1054 pr_info("crc32c_combine: %d self tests passed\n", runs); 1055 1056 return 0; 1057 } 1058 1059 static int __init crc32_test(void) 1060 { 1061 int i; 1062 int errors = 0; 1063 int bytes = 0; 1064 u64 nsec; 1065 unsigned long flags; 1066 1067 /* keep static to prevent cache warming code from 1068 * getting eliminated by the compiler */ 1069 static u32 crc; 1070 1071 /* pre-warm the cache */ 1072 for (i = 0; i < 100; i++) { 1073 bytes += 2*test[i].length; 1074 1075 crc ^= crc32_le(test[i].crc, test_buf + 1076 test[i].start, test[i].length); 1077 1078 crc ^= crc32_be(test[i].crc, test_buf + 1079 test[i].start, test[i].length); 1080 } 1081 1082 /* reduce OS noise */ 1083 local_irq_save(flags); 1084 local_irq_disable(); 1085 1086 nsec = ktime_get_ns(); 1087 for (i = 0; i < 100; i++) { 1088 if (test[i].crc_le != crc32_le(test[i].crc, test_buf + 1089 test[i].start, test[i].length)) 1090 errors++; 1091 1092 if (test[i].crc_be != crc32_be(test[i].crc, test_buf + 1093 test[i].start, test[i].length)) 1094 errors++; 1095 } 1096 nsec = ktime_get_ns() - nsec; 1097 1098 local_irq_restore(flags); 1099 local_irq_enable(); 1100 1101 pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n", 1102 CRC_LE_BITS, CRC_BE_BITS); 1103 1104 if (errors) 1105 pr_warn("crc32: %d self tests failed\n", errors); 1106 else { 1107 pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n", 1108 bytes, nsec); 1109 } 1110 1111 return 0; 1112 } 1113 1114 static int __init crc32_combine_test(void) 1115 { 1116 int i, j; 1117 int errors = 0, runs = 0; 1118 1119 for (i = 0; i < 10; i++) { 1120 u32 crc_full; 1121 1122 crc_full = crc32_le(test[i].crc, test_buf + test[i].start, 1123 test[i].length); 1124 for (j = 0; j <= test[i].length; ++j) { 1125 u32 crc1, crc2; 1126 u32 len1 = j, len2 = test[i].length - j; 1127 1128 crc1 = crc32_le(test[i].crc, test_buf + 1129 test[i].start, len1); 1130 crc2 = crc32_le(0, test_buf + test[i].start + 1131 len1, len2); 1132 1133 if (!(crc_full == crc32_le_combine(crc1, crc2, len2) && 1134 crc_full == test[i].crc_le)) 1135 errors++; 1136 runs++; 1137 cond_resched(); 1138 } 1139 } 1140 1141 if (errors) 1142 pr_warn("crc32_combine: %d/%d self tests failed\n", errors, runs); 1143 else 1144 pr_info("crc32_combine: %d self tests passed\n", runs); 1145 1146 return 0; 1147 } 1148 1149 static int __init crc32test_init(void) 1150 { 1151 crc32_test(); 1152 crc32c_test(); 1153 1154 crc32_combine_test(); 1155 crc32c_combine_test(); 1156 1157 return 0; 1158 } 1159 1160 static void __exit crc32_exit(void) 1161 { 1162 } 1163 1164 module_init(crc32test_init); 1165 module_exit(crc32_exit); 1166 #endif /* CONFIG_CRC32_SELFTEST */ 1167