diff options
Diffstat (limited to 'lib/crc32.c')
| -rw-r--r-- | lib/crc32.c | 1287 |
1 files changed, 965 insertions, 322 deletions
diff --git a/lib/crc32.c b/lib/crc32.c index 4b35d2b4437c..b0d278fb1d91 100644 --- a/lib/crc32.c +++ b/lib/crc32.c @@ -1,4 +1,8 @@ /* + * Aug 8, 2011 Bob Pearson with help from Joakim Tjernlund and George Spelvin + * cleaned up code to current version of sparse and added the slicing-by-8 + * algorithm to the closely similar existing slicing-by-4 algorithm. + * * Oct 15, 2000 Matt Domsch <Matt_Domsch@dell.com> * Nicer crc32 functions/docs submitted by linux@horizon.com. Thanks! * Code was from the public domain, copyright abandoned. Code was @@ -20,52 +24,58 @@ * Version 2. See the file COPYING for more details. */ +/* see: Documentation/crc32.txt for a description of algorithms */ + #include <linux/crc32.h> -#include <linux/kernel.h> #include <linux/module.h> -#include <linux/compiler.h> #include <linux/types.h> -#include <linux/init.h> -#include <linux/atomic.h> #include "crc32defs.h" -#if CRC_LE_BITS == 8 -# define tole(x) __constant_cpu_to_le32(x) + +#if CRC_LE_BITS > 8 +# define tole(x) ((__force u32) __constant_cpu_to_le32(x)) #else # define tole(x) (x) #endif -#if CRC_BE_BITS == 8 -# define tobe(x) __constant_cpu_to_be32(x) +#if CRC_BE_BITS > 8 +# define tobe(x) ((__force u32) __constant_cpu_to_be32(x)) #else # define tobe(x) (x) #endif + #include "crc32table.h" MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>"); -MODULE_DESCRIPTION("Ethernet CRC32 calculations"); +MODULE_DESCRIPTION("Various CRC32 calculations"); MODULE_LICENSE("GPL"); -#if CRC_LE_BITS == 8 || CRC_BE_BITS == 8 +#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8 +/* implements slicing-by-4 or slicing-by-8 algorithm */ static inline u32 crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256]) { # ifdef __LITTLE_ENDIAN # define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8) -# define DO_CRC4 crc = t3[(crc) & 255] ^ \ - t2[(crc >> 8) & 255] ^ \ - t1[(crc >> 16) & 255] ^ \ - t0[(crc >> 24) & 255] +# define DO_CRC4 (t3[(q) & 255] ^ t2[(q >> 8) & 255] ^ \ + t1[(q >> 16) & 255] ^ t0[(q >> 24) & 255]) +# define DO_CRC8 (t7[(q) & 255] ^ t6[(q >> 8) & 255] ^ \ + t5[(q >> 16) & 255] ^ t4[(q >> 24) & 255]) # else # define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) -# define DO_CRC4 crc = t0[(crc) & 255] ^ \ - t1[(crc >> 8) & 255] ^ \ - t2[(crc >> 16) & 255] ^ \ - t3[(crc >> 24) & 255] +# define DO_CRC4 (t0[(q) & 255] ^ t1[(q >> 8) & 255] ^ \ + t2[(q >> 16) & 255] ^ t3[(q >> 24) & 255]) +# define DO_CRC8 (t4[(q) & 255] ^ t5[(q >> 8) & 255] ^ \ + t6[(q >> 16) & 255] ^ t7[(q >> 24) & 255]) # endif const u32 *b; size_t rem_len; +# ifdef CONFIG_X86 + size_t i; +# endif const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3]; + const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7]; + u32 q; /* Align it */ if (unlikely((long)buf & 3 && len)) { @@ -73,27 +83,51 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256]) DO_CRC(*buf++); } while ((--len) && ((long)buf)&3); } + +# if CRC_LE_BITS == 32 rem_len = len & 3; - /* load data 32 bits wide, xor data 32 bits wide. */ len = len >> 2; +# else + rem_len = len & 7; + len = len >> 3; +# endif + b = (const u32 *)buf; +# ifdef CONFIG_X86 + --b; + for (i = 0; i < len; i++) { +# else for (--b; len; --len) { - crc ^= *++b; /* use pre increment for speed */ - DO_CRC4; +# endif + q = crc ^ *++b; /* use pre increment for speed */ +# if CRC_LE_BITS == 32 + crc = DO_CRC4; +# else + crc = DO_CRC8; + q = *++b; + crc ^= DO_CRC4; +# endif } len = rem_len; /* And the last few bytes */ if (len) { u8 *p = (u8 *)(b + 1) - 1; +# ifdef CONFIG_X86 + for (i = 0; i < len; i++) + DO_CRC(*++p); /* use pre increment for speed */ +# else do { DO_CRC(*++p); /* use pre increment for speed */ } while (--len); +# endif } return crc; #undef DO_CRC #undef DO_CRC4 +#undef DO_CRC8 } #endif + /** * crc32_le() - Calculate bitwise little-endian Ethernet AUTODIN II CRC32 * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for @@ -101,53 +135,66 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256]) * @p: pointer to buffer over which CRC is run * @len: length of buffer @p */ -u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len); - -#if CRC_LE_BITS == 1 -/* - * In fact, the table-based code will work in this case, but it can be - * simplified by inlining the table in ?: form. - */ - -u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) +static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p, + size_t len, const u32 (*tab)[256], + u32 polynomial) { +#if CRC_LE_BITS == 1 int i; while (len--) { crc ^= *p++; for (i = 0; i < 8; i++) - crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0); + crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0); + } +# elif CRC_LE_BITS == 2 + while (len--) { + crc ^= *p++; + crc = (crc >> 2) ^ tab[0][crc & 3]; + crc = (crc >> 2) ^ tab[0][crc & 3]; + crc = (crc >> 2) ^ tab[0][crc & 3]; + crc = (crc >> 2) ^ tab[0][crc & 3]; } - return crc; -} -#else /* Table-based approach */ - -u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) -{ -# if CRC_LE_BITS == 8 - const u32 (*tab)[] = crc32table_le; - - crc = __cpu_to_le32(crc); - crc = crc32_body(crc, p, len, tab); - return __le32_to_cpu(crc); # elif CRC_LE_BITS == 4 while (len--) { crc ^= *p++; - crc = (crc >> 4) ^ crc32table_le[crc & 15]; - crc = (crc >> 4) ^ crc32table_le[crc & 15]; + crc = (crc >> 4) ^ tab[0][crc & 15]; + crc = (crc >> 4) ^ tab[0][crc & 15]; } - return crc; -# elif CRC_LE_BITS == 2 +# elif CRC_LE_BITS == 8 + /* aka Sarwate algorithm */ while (len--) { crc ^= *p++; - crc = (crc >> 2) ^ crc32table_le[crc & 3]; - crc = (crc >> 2) ^ crc32table_le[crc & 3]; - crc = (crc >> 2) ^ crc32table_le[crc & 3]; - crc = (crc >> 2) ^ crc32table_le[crc & 3]; + crc = (crc >> 8) ^ tab[0][crc & 255]; } +# else + crc = (__force u32) __cpu_to_le32(crc); + crc = crc32_body(crc, p, len, tab); + crc = __le32_to_cpu((__force __le32)crc); +#endif return crc; -# endif +} + +#if CRC_LE_BITS == 1 +u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) +{ + return crc32_le_generic(crc, p, len, NULL, CRCPOLY_LE); +} +u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) +{ + return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE); +} +#else +u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) +{ + return crc32_le_generic(crc, p, len, crc32table_le, CRCPOLY_LE); +} +u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) +{ + return crc32_le_generic(crc, p, len, crc32ctable_le, CRC32C_POLY_LE); } #endif +EXPORT_SYMBOL(crc32_le); +EXPORT_SYMBOL(__crc32c_le); /** * crc32_be() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32 @@ -156,317 +203,913 @@ u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) * @p: pointer to buffer over which CRC is run * @len: length of buffer @p */ -u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len); - -#if CRC_BE_BITS == 1 -/* - * In fact, the table-based code will work in this case, but it can be - * simplified by inlining the table in ?: form. - */ - -u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) +static inline u32 __pure crc32_be_generic(u32 crc, unsigned char const *p, + size_t len, const u32 (*tab)[256], + u32 polynomial) { +#if CRC_BE_BITS == 1 int i; while (len--) { crc ^= *p++ << 24; for (i = 0; i < 8; i++) crc = - (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : + (crc << 1) ^ ((crc & 0x80000000) ? polynomial : 0); } - return crc; -} - -#else /* Table-based approach */ -u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) -{ -# if CRC_BE_BITS == 8 - const u32 (*tab)[] = crc32table_be; - - crc = __cpu_to_be32(crc); - crc = crc32_body(crc, p, len, tab); - return __be32_to_cpu(crc); +# elif CRC_BE_BITS == 2 + while (len--) { + crc ^= *p++ << 24; + crc = (crc << 2) ^ tab[0][crc >> 30]; + crc = (crc << 2) ^ tab[0][crc >> 30]; + crc = (crc << 2) ^ tab[0][crc >> 30]; + crc = (crc << 2) ^ tab[0][crc >> 30]; + } # elif CRC_BE_BITS == 4 while (len--) { crc ^= *p++ << 24; - crc = (crc << 4) ^ crc32table_be[crc >> 28]; - crc = (crc << 4) ^ crc32table_be[crc >> 28]; + crc = (crc << 4) ^ tab[0][crc >> 28]; + crc = (crc << 4) ^ tab[0][crc >> 28]; } - return crc; -# elif CRC_BE_BITS == 2 +# elif CRC_BE_BITS == 8 while (len--) { crc ^= *p++ << 24; - crc = (crc << 2) ^ crc32table_be[crc >> 30]; - crc = (crc << 2) ^ crc32table_be[crc >> 30]; - crc = (crc << 2) ^ crc32table_be[crc >> 30]; - crc = (crc << 2) ^ crc32table_be[crc >> 30]; + crc = (crc << 8) ^ tab[0][crc >> 24]; } - return crc; +# else + crc = (__force u32) __cpu_to_be32(crc); + crc = crc32_body(crc, p, len, tab); + crc = __be32_to_cpu((__force __be32)crc); # endif + return crc; } -#endif -EXPORT_SYMBOL(crc32_le); +#if CRC_LE_BITS == 1 +u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) +{ + return crc32_be_generic(crc, p, len, NULL, CRCPOLY_BE); +} +#else +u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) +{ + return crc32_be_generic(crc, p, len, crc32table_be, CRCPOLY_BE); +} +#endif EXPORT_SYMBOL(crc32_be); -/* - * A brief CRC tutorial. - * - * A CRC is a long-division remainder. You add the CRC to the message, - * and the whole thing (message+CRC) is a multiple of the given - * CRC polynomial. To check the CRC, you can either check that the - * CRC matches the recomputed value, *or* you can check that the - * remainder computed on the message+CRC is 0. This latter approach - * is used by a lot of hardware implementations, and is why so many - * protocols put the end-of-frame flag after the CRC. - * - * It's actually the same long division you learned in school, except that - * - We're working in binary, so the digits are only 0 and 1, and - * - When dividing polynomials, there are no carries. Rather than add and - * subtract, we just xor. Thus, we tend to get a bit sloppy about - * the difference between adding and subtracting. - * - * A 32-bit CRC polynomial is actually 33 bits long. But since it's - * 33 bits long, bit 32 is always going to be set, so usually the CRC - * is written in hex with the most significant bit omitted. (If you're - * familiar with the IEEE 754 floating-point format, it's the same idea.) - * - * Note that a CRC is computed over a string of *bits*, so you have - * to decide on the endianness of the bits within each byte. To get - * the best error-detecting properties, this should correspond to the - * order they're actually sent. For example, standard RS-232 serial is - * little-endian; the most significant bit (sometimes used for parity) - * is sent last. And when appending a CRC word to a message, you should - * do it in the right order, matching the endianness. - * - * Just like with ordinary division, the remainder is always smaller than - * the divisor (the CRC polynomial) you're dividing by. Each step of the - * division, you take one more digit (bit) of the dividend and append it - * to the current remainder. Then you figure out the appropriate multiple - * of the divisor to subtract to being the remainder back into range. - * In binary, it's easy - it has to be either 0 or 1, and to make the - * XOR cancel, it's just a copy of bit 32 of the remainder. - * - * When computing a CRC, we don't care about the quotient, so we can - * throw the quotient bit away, but subtract the appropriate multiple of - * the polynomial from the remainder and we're back to where we started, - * ready to process the next bit. - * - * A big-endian CRC written this way would be coded like: - * for (i = 0; i < input_bits; i++) { - * multiple = remainder & 0x80000000 ? CRCPOLY : 0; - * remainder = (remainder << 1 | next_input_bit()) ^ multiple; - * } - * Notice how, to get at bit 32 of the shifted remainder, we look - * at bit 31 of the remainder *before* shifting it. - * - * But also notice how the next_input_bit() bits we're shifting into - * the remainder don't actually affect any decision-making until - * 32 bits later. Thus, the first 32 cycles of this are pretty boring. - * Also, to add the CRC to a message, we need a 32-bit-long hole for it at - * the end, so we have to add 32 extra cycles shifting in zeros at the - * end of every message, - * - * So the standard trick is to rearrage merging in the next_input_bit() - * until the moment it's needed. Then the first 32 cycles can be precomputed, - * and merging in the final 32 zero bits to make room for the CRC can be - * skipped entirely. - * This changes the code to: - * for (i = 0; i < input_bits; i++) { - * remainder ^= next_input_bit() << 31; - * multiple = (remainder & 0x80000000) ? CRCPOLY : 0; - * remainder = (remainder << 1) ^ multiple; - * } - * With this optimization, the little-endian code is simpler: - * for (i = 0; i < input_bits; i++) { - * remainder ^= next_input_bit(); - * multiple = (remainder & 1) ? CRCPOLY : 0; - * remainder = (remainder >> 1) ^ multiple; - * } - * - * Note that the other details of endianness have been hidden in CRCPOLY - * (which must be bit-reversed) and next_input_bit(). - * - * However, as long as next_input_bit is returning the bits in a sensible - * order, we can actually do the merging 8 or more bits at a time rather - * than one bit at a time: - * for (i = 0; i < input_bytes; i++) { - * remainder ^= next_input_byte() << 24; - * for (j = 0; j < 8; j++) { - * multiple = (remainder & 0x80000000) ? CRCPOLY : 0; - * remainder = (remainder << 1) ^ multiple; - * } - * } - * Or in little-endian: - * for (i = 0; i < input_bytes; i++) { - * remainder ^= next_input_byte(); - * for (j = 0; j < 8; j++) { - * multiple = (remainder & 1) ? CRCPOLY : 0; - * remainder = (remainder << 1) ^ multiple; - * } - * } - * If the input is a multiple of 32 bits, you can even XOR in a 32-bit - * word at a time and increase the inner loop count to 32. - * - * You can also mix and match the two loop styles, for example doing the - * bulk of a message byte-at-a-time and adding bit-at-a-time processing - * for any fractional bytes at the end. - * - * The only remaining optimization is to the byte-at-a-time table method. - * Here, rather than just shifting one bit of the remainder to decide - * in the correct multiple to subtract, we can shift a byte at a time. - * This produces a 40-bit (rather than a 33-bit) intermediate remainder, - * but again the multiple of the polynomial to subtract depends only on - * the high bits, the high 8 bits in this case. - * - * The multiple we need in that case is the low 32 bits of a 40-bit - * value whose high 8 bits are given, and which is a multiple of the - * generator polynomial. This is simply the CRC-32 of the given - * one-byte message. - * - * Two more details: normally, appending zero bits to a message which - * is already a multiple of a polynomial produces a larger multiple of that - * polynomial. To enable a CRC to detect this condition, it's common to - * invert the CRC before appending it. This makes the remainder of the - * message+crc come out not as zero, but some fixed non-zero value. - * - * The same problem applies to zero bits prepended to the message, and - * a similar solution is used. Instead of starting with a remainder of - * 0, an initial remainder of all ones is used. As long as you start - * the same way on decoding, it doesn't make a difference. - */ - -#ifdef UNITTEST +#ifdef CONFIG_CRC32_SELFTEST -#include <stdlib.h> -#include <stdio.h> +/* 4096 random bytes */ +static u8 __attribute__((__aligned__(8))) test_buf[] = +{ + 0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30, + 0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4, + 0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60, + 0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c, + 0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4, + 0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a, + 0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a, + 0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4, + 0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9, + 0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4, + 0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca, + 0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61, + 0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e, + 0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a, + 0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 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0x98, 0x82, + 0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8, + 0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e, + 0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85, + 0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98, + 0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22, + 0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7, + 0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49, + 0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33, + 0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc, + 0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8, + 0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f, + 0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3, + 0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98, + 0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c, + 0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6, + 0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc, + 0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d, +}; -#if 0 /*Not used at present */ -static void -buf_dump(char const *prefix, unsigned char const *buf, size_t len) +/* 100 test cases */ +static struct crc_test { + u32 crc; /* random starting crc */ + u32 start; /* random 6 bit offset in buf */ + u32 length; /* random 11 bit length of test */ + u32 crc_le; /* expected crc32_le result */ + u32 crc_be; /* expected crc32_be result */ + u32 crc32c_le; /* expected crc32c_le result */ +} test[] = { - fputs(prefix, stdout); - while (len--) - printf(" %02x", *buf++); - putchar('\n'); + {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1, + 0xf6e93d6c}, + {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad, + 0x0fe92aca}, + {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f, + 0x52e1ebb8}, + {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a, + 0x0798af9a}, + {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2, + 0x18eb3152}, + {0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793, + 0xd00d08c7}, + {0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed, + 0x8ba966bc}, + {0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35, + 0x11d694a2}, + {0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2, + 0x6ab3208d}, + {0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10, + 0xba4603c5}, + {0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb, + 0xe6071c6f}, + {0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0, + 0x179ec30a}, + {0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb, + 0x0903beb8}, + {0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed, + 0x6a7cb4fa}, + {0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591, + 0xdb535801}, + {0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67, + 0x92bed597}, + {0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd, + 0x192a3f1b}, + {0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a, + 0xccbaec1a}, + {0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b, + 0x7eabae4d}, + {0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f, + 0x28c72982}, + {0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d, + 0xc3cd4d18}, + {0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a, + 0xbca8f0e7}, + {0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97, + 0x713f60b3}, + {0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2, + 0xebd08fd5}, + {0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138, + 0x64406c59}, + {0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032, + 0x7421890e}, + {0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f, + 0xe9347603}, + {0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f, + 0x1bef9060}, + {0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32, + 0x34720072}, + {0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef, + 0x48310f59}, + {0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0, + 0x783a4213}, + {0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59, + 0x9e8efd41}, + {0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4, + 0xfc3d34a5}, + {0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c, + 0x17a52ae2}, + {0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51, + 0x886d935a}, + {0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11, + 0xeaaeaeb2}, + {0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659, + 0x8e900a4b}, + {0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af, + 0xd74662b1}, + {0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99, + 0xd26752ba}, + {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b, + 0x8b1fcd62}, + {0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521, + 0xf54342fe}, + {0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3, + 0x5b95b988}, + {0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d, + 0x2e1176be}, + {0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f, + 0x66120546}, + {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b, + 0xf256a5cc}, + {0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0, + 0x4af1dd69}, + {0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195, + 0x56f0a04a}, + {0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d, + 0x74f6b6b2}, + {0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4, + 0x085951fd}, + {0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3, + 0xc65387eb}, + {0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643, + 0x1ca9257b}, + {0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10, + 0xfd196d76}, + {0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d, + 0x5ef88339}, + {0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5, + 0x2c3714d9}, + {0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b, + 0x58576548}, + {0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee, + 0xfd7c57de}, + {0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14, + 0xd5fedd59}, + {0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a, + 0x1cc3b17b}, + {0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b, + 0x270eed73}, + {0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3, + 0x91ecbb11}, + {0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826, + 0x05ed8d0c}, + {0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06, + 0x0b09ad5b}, + {0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35, + 0xf8d511fb}, + {0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801, + 0x5ad832cc}, + {0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2, + 0x1214d196}, + {0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d, + 0x5747218a}, + {0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c, + 0xde8f14de}, + {0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba, + 0x3563b7b9}, + {0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5, + 0x071475d0}, + {0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b, + 0x54c79d60}, + {0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178, + 0x4c53eee6}, + {0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3, + 0x10137a3c}, + {0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605, + 0xaa9d6c73}, + {0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1, + 0xb63d23e7}, + {0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9, + 0x7f53e9cf}, + {0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78, + 0x13c1cd83}, + {0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9, + 0x49ff5867}, + {0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd, + 0x8467f211}, + {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab, + 0x3f9683b2}, + {0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb, + 0x76a3f874}, + {0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77, + 0x863b702f}, + {0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da, + 0xdc6c58ff}, + {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39, + 0x0622cc95}, + {0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16, + 0xe85605cd}, + {0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208, + 0x31da5f06}, + {0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e, + 0xa1f2e784}, + {0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5, + 0xb07cc616}, + {0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892, + 0xbf943b6c}, + {0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db, + 0x2c01af1c}, + {0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43, + 0x0fe5f56d}, + {0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac, + 0xf8943b2d}, + {0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7, + 0xe4d89272}, + {0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2, + 0x7c2f6bbb}, + {0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2, + 0xabbf388b}, + {0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640, + 0x1dca1f4e}, + {0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f, + 0x5c170e23}, + {0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99, + 0xc0e9d672}, + {0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7, + 0xc18bdc86}, + {0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499, + 0xa874fcdd}, + {0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a, + 0x9dc0bb48}, +}; -} -#endif +#include <linux/time.h> -static void bytereverse(unsigned char *buf, size_t len) +static int __init crc32c_test(void) { - while (len--) { - unsigned char x = bitrev8(*buf); - *buf++ = x; + int i; + int errors = 0; + int bytes = 0; + struct timespec start, stop; + u64 nsec; + unsigned long flags; + + /* keep static to prevent cache warming code from + * getting eliminated by the compiler */ + static u32 crc; + + /* pre-warm the cache */ + for (i = 0; i < 100; i++) { + bytes += 2*test[i].length; + + crc ^= __crc32c_le(test[i].crc, test_buf + + test[i].start, test[i].length); } -} -static void random_garbage(unsigned char *buf, size_t len) -{ - while (len--) - *buf++ = (unsigned char) random(); -} + /* reduce OS noise */ + local_irq_save(flags); + local_irq_disable(); -#if 0 /* Not used at present */ -static void store_le(u32 x, unsigned char *buf) -{ - buf[0] = (unsigned char) x; - buf[1] = (unsigned char) (x >> 8); - buf[2] = (unsigned char) (x >> 16); - buf[3] = (unsigned char) (x >> 24); -} -#endif + getnstimeofday(&start); + for (i = 0; i < 100; i++) { + if (test[i].crc32c_le != __crc32c_le(test[i].crc, test_buf + + test[i].start, test[i].length)) + errors++; + } + getnstimeofday(&stop); -static void store_be(u32 x, unsigned char *buf) -{ - buf[0] = (unsigned char) (x >> 24); - buf[1] = (unsigned char) (x >> 16); - buf[2] = (unsigned char) (x >> 8); - buf[3] = (unsigned char) x; + local_irq_restore(flags); + local_irq_enable(); + + nsec = stop.tv_nsec - start.tv_nsec + + 1000000000 * (stop.tv_sec - start.tv_sec); + + pr_info("crc32c: CRC_LE_BITS = %d\n", CRC_LE_BITS); + + if (errors) + pr_warn("crc32c: %d self tests failed\n", errors); + else { + pr_info("crc32c: self tests passed, processed %d bytes in %lld nsec\n", + bytes, nsec); + } + + return 0; } -/* - * This checks that CRC(buf + CRC(buf)) = 0, and that - * CRC commutes with bit-reversal. This has the side effect - * of bytewise bit-reversing the input buffer, and returns - * the CRC of the reversed buffer. - */ -static u32 test_step(u32 init, unsigned char *buf, size_t len) +static int __init crc32_test(void) { - u32 crc1, crc2; - size_t i; + int i; + int errors = 0; + int bytes = 0; + struct timespec start, stop; + u64 nsec; + unsigned long flags; + + /* keep static to prevent cache warming code from + * getting eliminated by the compiler */ + static u32 crc; + + /* pre-warm the cache */ + for (i = 0; i < 100; i++) { + bytes += 2*test[i].length; - crc1 = crc32_be(init, buf, len); - store_be(crc1, buf + len); - crc2 = crc32_be(init, buf, len + 4); - if (crc2) - printf("\nCRC cancellation fail: 0x%08x should be 0\n", - crc2); - - for (i = 0; i <= len + 4; i++) { - crc2 = crc32_be(init, buf, i); - crc2 = crc32_be(crc2, buf + i, len + 4 - i); - if (crc2) - printf("\nCRC split fail: 0x%08x\n", crc2); + crc ^= crc32_le(test[i].crc, test_buf + + test[i].start, test[i].length); + + crc ^= crc32_be(test[i].crc, test_buf + + test[i].start, test[i].length); } - /* Now swap it around for the other test */ - - bytereverse(buf, len + 4); - init = bitrev32(init); - crc2 = bitrev32(crc1); - if (crc1 != bitrev32(crc2)) - printf("\nBit reversal fail: 0x%08x -> 0x%08x -> 0x%08x\n", - crc1, crc2, bitrev32(crc2)); - crc1 = crc32_le(init, buf, len); - if (crc1 != crc2) - printf("\nCRC endianness fail: 0x%08x != 0x%08x\n", crc1, - crc2); - crc2 = crc32_le(init, buf, len + 4); - if (crc2) - printf("\nCRC cancellation fail: 0x%08x should be 0\n", - crc2); - - for (i = 0; i <= len + 4; i++) { - crc2 = crc32_le(init, buf, i); - crc2 = crc32_le(crc2, buf + i, len + 4 - i); - if (crc2) - printf("\nCRC split fail: 0x%08x\n", crc2); + /* reduce OS noise */ + local_irq_save(flags); + local_irq_disable(); + + getnstimeofday(&start); + for (i = 0; i < 100; i++) { + if (test[i].crc_le != crc32_le(test[i].crc, test_buf + + test[i].start, test[i].length)) + errors++; + + if (test[i].crc_be != crc32_be(test[i].crc, test_buf + + test[i].start, test[i].length)) + errors++; } + getnstimeofday(&stop); - return crc1; -} + local_irq_restore(flags); + local_irq_enable(); -#define SIZE 64 -#define INIT1 0 -#define INIT2 0 + nsec = stop.tv_nsec - start.tv_nsec + + 1000000000 * (stop.tv_sec - start.tv_sec); -int main(void) -{ - unsigned char buf1[SIZE + 4]; - unsigned char buf2[SIZE + 4]; - unsigned char buf3[SIZE + 4]; - int i, j; - u32 crc1, crc2, crc3; - - for (i = 0; i <= SIZE; i++) { - printf("\rTesting length %d...", i); - fflush(stdout); - random_garbage(buf1, i); - random_garbage(buf2, i); - for (j = 0; j < i; j++) - buf3[j] = buf1[j] ^ buf2[j]; - - crc1 = test_step(INIT1, buf1, i); - crc2 = test_step(INIT2, buf2, i); - /* Now check that CRC(buf1 ^ buf2) = CRC(buf1) ^ CRC(buf2) */ - crc3 = test_step(INIT1 ^ INIT2, buf3, i); - if (crc3 != (crc1 ^ crc2)) - printf("CRC XOR fail: 0x%08x != 0x%08x ^ 0x%08x\n", - crc3, crc1, crc2); + pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n", + CRC_LE_BITS, CRC_BE_BITS); + + if (errors) + pr_warn("crc32: %d self tests failed\n", errors); + else { + pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n", + bytes, nsec); } - printf("\nAll test complete. No failures expected.\n"); + return 0; } -#endif /* UNITTEST */ +static int __init crc32test_init(void) +{ + crc32_test(); + crc32c_test(); + return 0; +} + +static void __exit crc32_exit(void) +{ +} + +module_init(crc32test_init); +module_exit(crc32_exit); +#endif /* CONFIG_CRC32_SELFTEST */ |