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 49MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>"); 50MODULE_DESCRIPTION("Various CRC32 calculations"); 51MODULE_LICENSE("GPL"); 52 53#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8 54 55/* implements slicing-by-4 or slicing-by-8 algorithm */ 56static inline u32 __pure 57crc32_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 */ 145static 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 185u32 __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} 189u32 __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 194u32 __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} 199u32 __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 205EXPORT_SYMBOL(crc32_le); 206EXPORT_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 */ 213static 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 */ 239static 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 269u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len) 270{ 271 return crc32_generic_shift(crc, len, CRCPOLY_LE); 272} 273 274u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len) 275{ 276 return crc32_generic_shift(crc, len, CRC32C_POLY_LE); 277} 278EXPORT_SYMBOL(crc32_le_shift); 279EXPORT_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 */ 290static 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 331u32 __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 336u32 __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 342EXPORT_SYMBOL(crc32_be); 343 344#ifdef CONFIG_CRC32_SELFTEST 345 346/* 4096 random bytes */ 347static 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, 0x4f, 0x84, 0x66, 0xa7, 424 0x58, 0x5c, 0x7b, 0x86, 0x52, 0x6d, 0x0d, 0xce, 425 0xa4, 0x30, 0x7d, 0xb6, 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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 */ 864static 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 977static int __init crc32c_test(void) 978{ 979 int i; 980 int errors = 0; 981 int bytes = 0; 982 struct timespec start, stop; 983 u64 nsec; 984 unsigned long flags; 985 986 /* keep static to prevent cache warming code from 987 * getting eliminated by the compiler */ 988 static u32 crc; 989 990 /* pre-warm the cache */ 991 for (i = 0; i < 100; i++) { 992 bytes += 2*test[i].length; 993 994 crc ^= __crc32c_le(test[i].crc, test_buf + 995 test[i].start, test[i].length); 996 } 997 998 /* reduce OS noise */ 999 local_irq_save(flags); 1000 local_irq_disable(); 1001 1002 getnstimeofday(&start); 1003 for (i = 0; i < 100; i++) { 1004 if (test[i].crc32c_le != __crc32c_le(test[i].crc, test_buf + 1005 test[i].start, test[i].length)) 1006 errors++; 1007 } 1008 getnstimeofday(&stop); 1009 1010 local_irq_restore(flags); 1011 local_irq_enable(); 1012 1013 nsec = stop.tv_nsec - start.tv_nsec + 1014 1000000000 * (stop.tv_sec - start.tv_sec); 1015 1016 pr_info("crc32c: CRC_LE_BITS = %d\n", CRC_LE_BITS); 1017 1018 if (errors) 1019 pr_warn("crc32c: %d self tests failed\n", errors); 1020 else { 1021 pr_info("crc32c: self tests passed, processed %d bytes in %lld nsec\n", 1022 bytes, nsec); 1023 } 1024 1025 return 0; 1026} 1027 1028static int __init crc32c_combine_test(void) 1029{ 1030 int i, j; 1031 int errors = 0, runs = 0; 1032 1033 for (i = 0; i < 10; i++) { 1034 u32 crc_full; 1035 1036 crc_full = __crc32c_le(test[i].crc, test_buf + test[i].start, 1037 test[i].length); 1038 for (j = 0; j <= test[i].length; ++j) { 1039 u32 crc1, crc2; 1040 u32 len1 = j, len2 = test[i].length - j; 1041 1042 crc1 = __crc32c_le(test[i].crc, test_buf + 1043 test[i].start, len1); 1044 crc2 = __crc32c_le(0, test_buf + test[i].start + 1045 len1, len2); 1046 1047 if (!(crc_full == __crc32c_le_combine(crc1, crc2, len2) && 1048 crc_full == test[i].crc32c_le)) 1049 errors++; 1050 runs++; 1051 cond_resched(); 1052 } 1053 } 1054 1055 if (errors) 1056 pr_warn("crc32c_combine: %d/%d self tests failed\n", errors, runs); 1057 else 1058 pr_info("crc32c_combine: %d self tests passed\n", runs); 1059 1060 return 0; 1061} 1062 1063static int __init crc32_test(void) 1064{ 1065 int i; 1066 int errors = 0; 1067 int bytes = 0; 1068 struct timespec start, stop; 1069 u64 nsec; 1070 unsigned long flags; 1071 1072 /* keep static to prevent cache warming code from 1073 * getting eliminated by the compiler */ 1074 static u32 crc; 1075 1076 /* pre-warm the cache */ 1077 for (i = 0; i < 100; i++) { 1078 bytes += 2*test[i].length; 1079 1080 crc ^= crc32_le(test[i].crc, test_buf + 1081 test[i].start, test[i].length); 1082 1083 crc ^= crc32_be(test[i].crc, test_buf + 1084 test[i].start, test[i].length); 1085 } 1086 1087 /* reduce OS noise */ 1088 local_irq_save(flags); 1089 local_irq_disable(); 1090 1091 getnstimeofday(&start); 1092 for (i = 0; i < 100; i++) { 1093 if (test[i].crc_le != crc32_le(test[i].crc, test_buf + 1094 test[i].start, test[i].length)) 1095 errors++; 1096 1097 if (test[i].crc_be != crc32_be(test[i].crc, test_buf + 1098 test[i].start, test[i].length)) 1099 errors++; 1100 } 1101 getnstimeofday(&stop); 1102 1103 local_irq_restore(flags); 1104 local_irq_enable(); 1105 1106 nsec = stop.tv_nsec - start.tv_nsec + 1107 1000000000 * (stop.tv_sec - start.tv_sec); 1108 1109 pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n", 1110 CRC_LE_BITS, CRC_BE_BITS); 1111 1112 if (errors) 1113 pr_warn("crc32: %d self tests failed\n", errors); 1114 else { 1115 pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n", 1116 bytes, nsec); 1117 } 1118 1119 return 0; 1120} 1121 1122static int __init crc32_combine_test(void) 1123{ 1124 int i, j; 1125 int errors = 0, runs = 0; 1126 1127 for (i = 0; i < 10; i++) { 1128 u32 crc_full; 1129 1130 crc_full = crc32_le(test[i].crc, test_buf + test[i].start, 1131 test[i].length); 1132 for (j = 0; j <= test[i].length; ++j) { 1133 u32 crc1, crc2; 1134 u32 len1 = j, len2 = test[i].length - j; 1135 1136 crc1 = crc32_le(test[i].crc, test_buf + 1137 test[i].start, len1); 1138 crc2 = crc32_le(0, test_buf + test[i].start + 1139 len1, len2); 1140 1141 if (!(crc_full == crc32_le_combine(crc1, crc2, len2) && 1142 crc_full == test[i].crc_le)) 1143 errors++; 1144 runs++; 1145 cond_resched(); 1146 } 1147 } 1148 1149 if (errors) 1150 pr_warn("crc32_combine: %d/%d self tests failed\n", errors, runs); 1151 else 1152 pr_info("crc32_combine: %d self tests passed\n", runs); 1153 1154 return 0; 1155} 1156 1157static int __init crc32test_init(void) 1158{ 1159 crc32_test(); 1160 crc32c_test(); 1161 1162 crc32_combine_test(); 1163 crc32c_combine_test(); 1164 1165 return 0; 1166} 1167 1168static void __exit crc32_exit(void) 1169{ 1170} 1171 1172module_init(crc32test_init); 1173module_exit(crc32_exit); 1174#endif /* CONFIG_CRC32_SELFTEST */ 1175