crc32.c 45.2 KB
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/*
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 * 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.
 *
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 * 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
 * subsequently included in the kernel, thus was re-licensed under the
 * GNU GPL v2.
 *
 * Oct 12, 2000 Matt Domsch <Matt_Domsch@dell.com>
 * Same crc32 function was used in 5 other places in the kernel.
 * I made one version, and deleted the others.
 * There are various incantations of crc32().  Some use a seed of 0 or ~0.
 * Some xor at the end with ~0.  The generic crc32() function takes
 * seed as an argument, and doesn't xor at the end.  Then individual
 * users can do whatever they need.
 *   drivers/net/smc9194.c uses seed ~0, doesn't xor with ~0.
 *   fs/jffs2 uses seed 0, doesn't xor with ~0.
 *   fs/partitions/efi.c uses seed ~0, xor's with ~0.
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

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/* see: Documentation/crc32.txt for a description of algorithms */

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#include <linux/crc32.h>
#include <linux/module.h>
#include <linux/types.h>
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#include <linux/sched.h>
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#include "crc32defs.h"
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#if CRC_LE_BITS > 8
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# define tole(x) ((__force u32) cpu_to_le32(x))
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#else
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# define tole(x) (x)
#endif

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#if CRC_BE_BITS > 8
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# define tobe(x) ((__force u32) cpu_to_be32(x))
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#else
# define tobe(x) (x)
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#endif
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#include "crc32table.h"

MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>");
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MODULE_DESCRIPTION("Various CRC32 calculations");
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MODULE_LICENSE("GPL");

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#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
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/* implements slicing-by-4 or slicing-by-8 algorithm */
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static inline u32 __pure
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crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
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{
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# ifdef __LITTLE_ENDIAN
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#  define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8)
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#  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])
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# else
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#  define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
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#  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])
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# endif
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	const u32 *b;
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	size_t    rem_len;
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# ifdef CONFIG_X86
	size_t i;
# endif
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	const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3];
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# if CRC_LE_BITS != 32
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	const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7];
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# endif
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	u32 q;
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	/* Align it */
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	if (unlikely((long)buf & 3 && len)) {
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		do {
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			DO_CRC(*buf++);
		} while ((--len) && ((long)buf)&3);
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	}
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# if CRC_LE_BITS == 32
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	rem_len = len & 3;
	len = len >> 2;
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# else
	rem_len = len & 7;
	len = len >> 3;
# endif

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	b = (const u32 *)buf;
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# ifdef CONFIG_X86
	--b;
	for (i = 0; i < len; i++) {
# else
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	for (--b; len; --len) {
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# endif
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		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
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	}
	len = rem_len;
	/* And the last few bytes */
	if (len) {
		u8 *p = (u8 *)(b + 1) - 1;
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# ifdef CONFIG_X86
		for (i = 0; i < len; i++)
			DO_CRC(*++p); /* use pre increment for speed */
# else
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		do {
			DO_CRC(*++p); /* use pre increment for speed */
		} while (--len);
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# endif
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	}
	return crc;
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#undef DO_CRC
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#undef DO_CRC4
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#undef DO_CRC8
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}
#endif
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/**
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 * crc32_le_generic() - Calculate bitwise little-endian Ethernet AUTODIN II
 *			CRC32/CRC32C
 * @crc: seed value for computation.  ~0 for Ethernet, sometimes 0 for other
 *	 uses, or the previous crc32/crc32c value if computing incrementally.
 * @p: pointer to buffer over which CRC32/CRC32C is run
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 * @len: length of buffer @p
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 * @tab: little-endian Ethernet table
 * @polynomial: CRC32/CRC32c LE polynomial
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 */
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static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p,
					  size_t len, const u32 (*tab)[256],
					  u32 polynomial)
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{
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#if CRC_LE_BITS == 1
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	int i;
	while (len--) {
		crc ^= *p++;
		for (i = 0; i < 8; i++)
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			crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);
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	}
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# elif CRC_LE_BITS == 2
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	while (len--) {
		crc ^= *p++;
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		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];
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	}
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# elif CRC_LE_BITS == 4
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	while (len--) {
		crc ^= *p++;
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		crc = (crc >> 4) ^ tab[0][crc & 15];
		crc = (crc >> 4) ^ tab[0][crc & 15];
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	}
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# elif CRC_LE_BITS == 8
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	/* aka Sarwate algorithm */
	while (len--) {
		crc ^= *p++;
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		crc = (crc >> 8) ^ tab[0][crc & 255];
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	}
# else
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	crc = (__force u32) __cpu_to_le32(crc);
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	crc = crc32_body(crc, p, len, tab);
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	crc = __le32_to_cpu((__force __le32)crc);
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#endif
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	return crc;
}
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#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)
{
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	return crc32_le_generic(crc, p, len,
			(const u32 (*)[256])crc32table_le, CRCPOLY_LE);
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}
u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
{
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	return crc32_le_generic(crc, p, len,
			(const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE);
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}
#endif
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EXPORT_SYMBOL(crc32_le);
EXPORT_SYMBOL(__crc32c_le);

/*
 * This multiplies the polynomials x and y modulo the given modulus.
 * This follows the "little-endian" CRC convention that the lsbit
 * represents the highest power of x, and the msbit represents x^0.
 */
static u32 __attribute_const__ gf2_multiply(u32 x, u32 y, u32 modulus)
{
	u32 product = x & 1 ? y : 0;
	int i;

	for (i = 0; i < 31; i++) {
		product = (product >> 1) ^ (product & 1 ? modulus : 0);
		x >>= 1;
		product ^= x & 1 ? y : 0;
	}

	return product;
}

/**
 * crc32_generic_shift - Append len 0 bytes to crc, in logarithmic time
 * @crc: The original little-endian CRC (i.e. lsbit is x^31 coefficient)
 * @len: The number of bytes. @crc is multiplied by x^(8*@len)
 * @polynomial: The modulus used to reduce the result to 32 bits.
 *
 * It's possible to parallelize CRC computations by computing a CRC
 * over separate ranges of a buffer, then summing them.
 * This shifts the given CRC by 8*len bits (i.e. produces the same effect
 * as appending len bytes of zero to the data), in time proportional
 * to log(len).
 */
static u32 __attribute_const__ crc32_generic_shift(u32 crc, size_t len,
						   u32 polynomial)
{
	u32 power = polynomial;	/* CRC of x^32 */
	int i;

	/* Shift up to 32 bits in the simple linear way */
	for (i = 0; i < 8 * (int)(len & 3); i++)
		crc = (crc >> 1) ^ (crc & 1 ? polynomial : 0);

	len >>= 2;
	if (!len)
		return crc;

	for (;;) {
		/* "power" is x^(2^i), modulo the polynomial */
		if (len & 1)
			crc = gf2_multiply(crc, power, polynomial);

		len >>= 1;
		if (!len)
			break;

		/* Square power, advancing to x^(2^(i+1)) */
		power = gf2_multiply(power, power, polynomial);
	}

	return crc;
}

u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len)
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{
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	return crc32_generic_shift(crc, len, CRCPOLY_LE);
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}

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u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len)
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{
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	return crc32_generic_shift(crc, len, CRC32C_POLY_LE);
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}
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EXPORT_SYMBOL(crc32_le_shift);
EXPORT_SYMBOL(__crc32c_le_shift);
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/**
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 * crc32_be_generic() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32
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 * @crc: seed value for computation.  ~0 for Ethernet, sometimes 0 for
 *	other uses, or the previous crc32 value if computing incrementally.
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 * @p: pointer to buffer over which CRC32 is run
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 * @len: length of buffer @p
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 * @tab: big-endian Ethernet table
 * @polynomial: CRC32 BE polynomial
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 */
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static inline u32 __pure crc32_be_generic(u32 crc, unsigned char const *p,
					  size_t len, const u32 (*tab)[256],
					  u32 polynomial)
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{
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#if CRC_BE_BITS == 1
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	int i;
	while (len--) {
		crc ^= *p++ << 24;
		for (i = 0; i < 8; i++)
			crc =
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			    (crc << 1) ^ ((crc & 0x80000000) ? polynomial :
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					  0);
	}
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# elif CRC_BE_BITS == 2
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	while (len--) {
		crc ^= *p++ << 24;
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		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];
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	}
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# elif CRC_BE_BITS == 4
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	while (len--) {
		crc ^= *p++ << 24;
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		crc = (crc << 4) ^ tab[0][crc >> 28];
		crc = (crc << 4) ^ tab[0][crc >> 28];
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	}
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# elif CRC_BE_BITS == 8
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	while (len--) {
		crc ^= *p++ << 24;
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		crc = (crc << 8) ^ tab[0][crc >> 24];
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	}
# else
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	crc = (__force u32) __cpu_to_be32(crc);
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	crc = crc32_body(crc, p, len, tab);
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	crc = __be32_to_cpu((__force __be32)crc);
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# endif
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	return crc;
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}
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#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)
{
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	return crc32_be_generic(crc, p, len,
			(const u32 (*)[256])crc32table_be, CRCPOLY_BE);
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}
#endif
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EXPORT_SYMBOL(crc32_be);

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#ifdef CONFIG_CRC32_SELFTEST
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/* 4096 random bytes */
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static u8 const __aligned(8) test_buf[] __initconst =
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{
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	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, 0x0b, 0x6f,
	0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd,
	0xbf, 0xb7, 0xc8, 0x04, 0x94, 0xf8, 0x8b, 0x8c,
	0xf1, 0xab, 0x7a, 0xd4, 0xdd, 0xf3, 0xe8, 0x88,
	0xc3, 0xed, 0x17, 0x8a, 0x9b, 0x40, 0x0d, 0x53,
	0x62, 0x12, 0x03, 0x5f, 0x1b, 0x35, 0x32, 0x1f,
	0xb4, 0x7b, 0x93, 0x78, 0x0d, 0xdb, 0xce, 0xa4,
	0xc0, 0x47, 0xd5, 0xbf, 0x68, 0xe8, 0x5d, 0x74,
	0x8f, 0x8e, 0x75, 0x1c, 0xb2, 0x4f, 0x9a, 0x60,
	0xd1, 0xbe, 0x10, 0xf4, 0x5c, 0xa1, 0x53, 0x09,
	0xa5, 0xe0, 0x09, 0x54, 0x85, 0x5c, 0xdc, 0x07,
	0xe7, 0x21, 0x69, 0x7b, 0x8a, 0xfd, 0x90, 0xf1,
	0x22, 0xd0, 0xb4, 0x36, 0x28, 0xe6, 0xb8, 0x0f,
	0x39, 0xde, 0xc8, 0xf3, 0x86, 0x60, 0x34, 0xd2,
	0x5e, 0xdf, 0xfd, 0xcf, 0x0f, 0xa9, 0x65, 0xf0,
	0xd5, 0x4d, 0x96, 0x40, 0xe3, 0xdf, 0x3f, 0x95,
	0x5a, 0x39, 0x19, 0x93, 0xf4, 0x75, 0xce, 0x22,
	0x00, 0x1c, 0x93, 0xe2, 0x03, 0x66, 0xf4, 0x93,
	0x73, 0x86, 0x81, 0x8e, 0x29, 0x44, 0x48, 0x86,
	0x61, 0x7c, 0x48, 0xa3, 0x43, 0xd2, 0x9c, 0x8d,
	0xd4, 0x95, 0xdd, 0xe1, 0x22, 0x89, 0x3a, 0x40,
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	0x17, 0xda, 0xf1, 0x01, 0x5b, 0xcd, 0xe2, 0x5f,
	0x50, 0x45, 0x73, 0x2b, 0xe4, 0x76, 0x77, 0xf4,
	0x64, 0x1d, 0x43, 0xfb, 0x84, 0x7a, 0xea, 0x91,
	0xae, 0xf9, 0x9e, 0xb7, 0xb4, 0xb0, 0x91, 0x5f,
	0x16, 0x35, 0x9a, 0x11, 0xb8, 0xc7, 0xc1, 0x8c,
	0xc6, 0x10, 0x8d, 0x2f, 0x63, 0x4a, 0xa7, 0x57,
	0x3a, 0x51, 0xd6, 0x32, 0x2d, 0x64, 0x72, 0xd4,
	0x66, 0xdc, 0x10, 0xa6, 0x67, 0xd6, 0x04, 0x23,
	0x9d, 0x0a, 0x11, 0x77, 0xdd, 0x37, 0x94, 0x17,
	0x3c, 0xbf, 0x8b, 0x65, 0xb0, 0x2e, 0x5e, 0x66,
	0x47, 0x64, 0xac, 0xdd, 0xf0, 0x84, 0xfd, 0x39,
	0xfa, 0x15, 0x5d, 0xef, 0xae, 0xca, 0xc1, 0x36,
	0xa7, 0x5c, 0xbf, 0xc7, 0x08, 0xc2, 0x66, 0x00,
	0x74, 0x74, 0x4e, 0x27, 0x3f, 0x55, 0x8a, 0xb7,
	0x38, 0x66, 0x83, 0x6d, 0xcf, 0x99, 0x9e, 0x60,
	0x8f, 0xdd, 0x2e, 0x62, 0x22, 0x0e, 0xef, 0x0c,
	0x98, 0xa7, 0x85, 0x74, 0x3b, 0x9d, 0xec, 0x9e,
	0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7,
	0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a,
	0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d,
	0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37,
	0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 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,
};

/* 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 */
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	u32 crc32c_le;	/* expected crc32c_le result */
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} const test[] __initconst =
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{
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	{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},
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};

#include <linux/time.h>

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static int __init crc32c_test(void)
{
	int i;
	int errors = 0;
	int bytes = 0;
	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);
	}

	/* reduce OS noise */
	local_irq_save(flags);
	local_irq_disable();

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	nsec = ktime_get_ns();
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	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++;
	}
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	nsec = ktime_get_ns() - nsec;
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	local_irq_restore(flags);
	local_irq_enable();

	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;
}

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static int __init crc32c_combine_test(void)
{
	int i, j;
	int errors = 0, runs = 0;

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	for (i = 0; i < 10; i++) {
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		u32 crc_full;

		crc_full = __crc32c_le(test[i].crc, test_buf + test[i].start,
				       test[i].length);
		for (j = 0; j <= test[i].length; ++j) {
			u32 crc1, crc2;
			u32 len1 = j, len2 = test[i].length - j;

			crc1 = __crc32c_le(test[i].crc, test_buf +
					   test[i].start, len1);
			crc2 = __crc32c_le(0, test_buf + test[i].start +
					   len1, len2);

			if (!(crc_full == __crc32c_le_combine(crc1, crc2, len2) &&
			      crc_full == test[i].crc32c_le))
				errors++;
			runs++;
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			cond_resched();
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		}
	}

	if (errors)
		pr_warn("crc32c_combine: %d/%d self tests failed\n", errors, runs);
	else
		pr_info("crc32c_combine: %d self tests passed\n", runs);

	return 0;
}

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static int __init crc32_test(void)
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{
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	int i;
	int errors = 0;
	int bytes = 0;
	u64 nsec;
	unsigned long flags;
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	/* keep static to prevent cache warming code from
	 * getting eliminated by the compiler */
	static u32 crc;
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	/* pre-warm the cache */
	for (i = 0; i < 100; i++) {
		bytes += 2*test[i].length;
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		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);
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	}

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	/* reduce OS noise */
	local_irq_save(flags);
	local_irq_disable();

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	nsec = ktime_get_ns();
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	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++;
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	}
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	nsec = ktime_get_ns() - nsec;
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	local_irq_restore(flags);
	local_irq_enable();
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	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);
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	}
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	return 0;
}

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static int __init crc32_combine_test(void)
{
	int i, j;
	int errors = 0, runs = 0;

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	for (i = 0; i < 10; i++) {
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		u32 crc_full;

		crc_full = crc32_le(test[i].crc, test_buf + test[i].start,
				    test[i].length);
		for (j = 0; j <= test[i].length; ++j) {
			u32 crc1, crc2;
			u32 len1 = j, len2 = test[i].length - j;

			crc1 = crc32_le(test[i].crc, test_buf +
					test[i].start, len1);
			crc2 = crc32_le(0, test_buf + test[i].start +
					len1, len2);

			if (!(crc_full == crc32_le_combine(crc1, crc2, len2) &&
			      crc_full == test[i].crc_le))
				errors++;
			runs++;
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			cond_resched();
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		}
	}

	if (errors)
		pr_warn("crc32_combine: %d/%d self tests failed\n", errors, runs);
	else
		pr_info("crc32_combine: %d self tests passed\n", runs);

	return 0;
}

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static int __init crc32test_init(void)
{
	crc32_test();
	crc32c_test();
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	crc32_combine_test();
	crc32c_combine_test();

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	return 0;
}

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static void __exit crc32_exit(void)
{
}

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module_init(crc32test_init);
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module_exit(crc32_exit);
#endif /* CONFIG_CRC32_SELFTEST */