From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> crc32c code isn't part of the kernel libxfs, nor should it be part of xfsprogs libxfs. Put it in libfrog since it's runtime support anyway. Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> --- .gitignore | 6 include/crc32c.h | 11 + libfrog/Makefile | 27 + libfrog/crc32.c | 869 ++++++++++++++++++++++++++++++++++++++++++++++ libfrog/crc32defs.h | 49 +++ libfrog/gen_crc32table.c | 80 ++++ libxfs/Makefile | 25 - libxfs/crc32.c | 869 ---------------------------------------------- libxfs/crc32defs.h | 49 --- libxfs/gen_crc32table.c | 80 ---- libxfs/libxfs_priv.h | 2 11 files changed, 1040 insertions(+), 1027 deletions(-) create mode 100644 include/crc32c.h create mode 100644 libfrog/crc32.c create mode 100644 libfrog/crc32defs.h create mode 100644 libfrog/gen_crc32table.c delete mode 100644 libxfs/crc32.c delete mode 100644 libxfs/crc32defs.h delete mode 100644 libxfs/gen_crc32table.c diff --git a/.gitignore b/.gitignore index 9d92eaff..fd131b6f 100644 --- a/.gitignore +++ b/.gitignore @@ -76,6 +76,6 @@ cscope.* /scrub/xfs_scrub_fail@.service # generated crc files -/libxfs/crc32selftest -/libxfs/crc32table.h -/libxfs/gen_crc32table +/libfrog/crc32selftest +/libfrog/crc32table.h +/libfrog/gen_crc32table diff --git a/include/crc32c.h b/include/crc32c.h new file mode 100644 index 00000000..b4d8aa05 --- /dev/null +++ b/include/crc32c.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2000-2005 Silicon Graphics, Inc. + * All Rights Reserved. + */ +#ifndef LIBFROG_CRC32C_H_ +#define LIBFROG_CRC32C_H_ + +extern uint32_t crc32c_le(uint32_t crc, unsigned char const *p, size_t len); + +#endif /* LIBFROG_CRC32C_H_ */ diff --git a/libfrog/Makefile b/libfrog/Makefile index f6828296..8e559e4a 100644 --- a/libfrog/Makefile +++ b/libfrog/Makefile @@ -13,6 +13,7 @@ LT_AGE = 0 CFILES = \ avl64.c \ convert.c \ +crc32.c \ fsgeom.c \ list_sort.c \ paths.c \ @@ -23,6 +24,12 @@ topology.c \ util.c \ workqueue.c +HFILES = \ +crc32defs.h \ +crc32table.h + +LSRCFILES += gen_crc32table.c + CFILES += $(PKG_PLATFORM).c PCFILES = darwin.c freebsd.c irix.c linux.c LSRCFILES = $(shell echo $(PCFILES) | sed -e "s/$(PKG_PLATFORM).c//g") @@ -35,7 +42,25 @@ ifeq ($(HAVE_GETMNTINFO),yes) LCFLAGS += -DHAVE_GETMNTINFO endif -default: ltdepend $(LTLIBRARY) +LDIRT = gen_crc32table crc32table.h crc32selftest + +default: crc32selftest ltdepend $(LTLIBRARY) + +crc32table.h: gen_crc32table.c crc32defs.h + @echo " [CC] gen_crc32table" + $(Q) $(BUILD_CC) $(BUILD_CFLAGS) -o gen_crc32table $< + @echo " [GENERATE] $@" + $(Q) ./gen_crc32table > crc32table.h + +# The selftest binary will return an error if it fails. This is made a +# dependency of the build process so that we refuse to build the tools on broken +# systems/architectures. Hence we make sure that xfsprogs will never use a +# busted CRC calculation at build time and hence avoid putting bad CRCs down on +# disk. +crc32selftest: gen_crc32table.c crc32table.h crc32.c crc32defs.h + @echo " [TEST] CRC32" + $(Q) $(BUILD_CC) $(BUILD_CFLAGS) -D CRC32_SELFTEST=1 crc32.c -o $@ + $(Q) ./$@ include $(BUILDRULES) diff --git a/libfrog/crc32.c b/libfrog/crc32.c new file mode 100644 index 00000000..a80a0c54 --- /dev/null +++ b/libfrog/crc32.c @@ -0,0 +1,869 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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@xxxxxxxx> + * Nicer crc32 functions/docs submitted by linux@xxxxxxxxxxx. 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@xxxxxxxx> + * 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. + */ + +/* see: Documentation/crc32.txt for a description of algorithms */ + +/* + * lifted from the 3.8-rc2 kernel source for xfsprogs. Killed CONFIG_X86 + * specific bits for just the generic algorithm. Also removed the big endian + * version of the algorithm as XFS only uses the little endian CRC version to + * match the hardware acceleration available on Intel CPUs. + */ + +#include "platform_defs.h" +#include "xfs.h" +#include "xfs_arch.h" +#include "crc32defs.h" + +/* types specifc to this file */ +typedef __u8 u8; +typedef __u16 u16; +typedef __u32 u32; +typedef __u32 u64; +#define __pure + +#if CRC_LE_BITS > 8 +# define tole(x) ((__force u32) __constant_cpu_to_le32(x)) +#else +# define tole(x) (x) +#endif + +#include "crc32table.h" + +#if CRC_LE_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]) +{ +#if __BYTE_ORDER == __LITTLE_ENDIAN +# define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8) +# 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]) +# elif __BYTE_ORDER == __BIG_ENDIAN +# define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) +# 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]) +# else +# error What endian are you? +# endif + const u32 *b; + size_t rem_len; + const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3]; +# if CRC_LE_BITS != 32 + const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7]; +# endif + u32 q; + + /* Align it */ + if (((long)buf & 3) && len) { + do { + DO_CRC(*buf++); + } while ((--len) && ((long)buf)&3); + } + +# if CRC_LE_BITS == 32 + rem_len = len & 3; + len = len >> 2; +# else + rem_len = len & 7; + len = len >> 3; +# endif + + b = (const u32 *)buf; + for (--b; len; --len) { + 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; + do { + DO_CRC(*++p); /* use pre increment for speed */ + } while (--len); + } + 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 + * other uses, or the previous crc32 value if computing incrementally. + * @p: pointer to buffer over which CRC is run + * @len: length of buffer @p + */ +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) ? 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]; + } +# elif CRC_LE_BITS == 4 + while (len--) { + crc ^= *p++; + crc = (crc >> 4) ^ tab[0][crc & 15]; + crc = (crc >> 4) ^ tab[0][crc & 15]; + } +# elif CRC_LE_BITS == 8 + /* aka Sarwate algorithm */ + while (len--) { + crc ^= *p++; + 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; +} + +#if CRC_LE_BITS == 1 +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 crc32c_le(u32 crc, unsigned char const *p, size_t len) +{ + return crc32_le_generic(crc, p, len, + (const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE); +} +#endif + + +#ifdef CRC32_SELFTEST + +/* 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, 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, 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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 crc32c_le; /* expected crc32c_le result */ +} test[] = +{ + {0x674bf11d, 0x00000038, 0x00000542, 0xf6e93d6c}, + {0x35c672c6, 0x0000003a, 0x000001aa, 0x0fe92aca}, + {0x496da28e, 0x00000039, 0x000005af, 0x52e1ebb8}, + {0x09a9b90e, 0x00000027, 0x000001f8, 0x0798af9a}, + {0xdc97e5a9, 0x00000025, 0x000003b6, 0x18eb3152}, + {0x47c58900, 0x0000000a, 0x000000b9, 0xd00d08c7}, + {0x292561e8, 0x0000000c, 0x00000403, 0x8ba966bc}, + {0x415037f6, 0x00000003, 0x00000676, 0x11d694a2}, + {0x3466e707, 0x00000026, 0x00000042, 0x6ab3208d}, + {0xafd1281b, 0x00000023, 0x000002ee, 0xba4603c5}, + {0xd3857b18, 0x00000028, 0x000004a2, 0xe6071c6f}, + {0x1d825a8f, 0x0000002b, 0x0000050b, 0x179ec30a}, + {0x5033e3bc, 0x0000000b, 0x00000078, 0x0903beb8}, + {0x94f1fb5e, 0x0000000f, 0x000003a2, 0x6a7cb4fa}, + {0xc9a0fe14, 0x00000009, 0x00000473, 0xdb535801}, + {0x88a034b1, 0x0000001c, 0x000005ad, 0x92bed597}, + {0xf0f72239, 0x00000020, 0x0000026d, 0x192a3f1b}, + {0xcc20a5e3, 0x0000003b, 0x0000067a, 0xccbaec1a}, + {0xce589c95, 0x0000002b, 0x00000641, 0x7eabae4d}, + {0x78edc885, 0x00000035, 0x000005be, 0x28c72982}, + {0x9d40a377, 0x0000003b, 0x00000038, 0xc3cd4d18}, + {0x703d0e01, 0x0000003c, 0x000006f1, 0xbca8f0e7}, + {0x776bf505, 0x0000000f, 0x000005b2, 0x713f60b3}, + {0x4a3e7854, 0x00000027, 0x000004b8, 0xebd08fd5}, + {0x209172dd, 0x0000003b, 0x00000356, 0x64406c59}, + {0x3ba4cc5b, 0x0000002f, 0x00000203, 0x7421890e}, + {0xfc62f297, 0x00000000, 0x00000079, 0xe9347603}, + {0x64280b8b, 0x00000016, 0x000007ab, 0x1bef9060}, + {0x97dd724b, 0x00000033, 0x000007ad, 0x34720072}, + {0x61394b52, 0x00000035, 0x00000571, 0x48310f59}, + {0x29b4faff, 0x00000024, 0x0000006e, 0x783a4213}, + {0x29bfb1dc, 0x0000000b, 0x00000244, 0x9e8efd41}, + {0x86ae934b, 0x00000035, 0x00000104, 0xfc3d34a5}, + {0xc4c1024e, 0x0000002e, 0x000006b1, 0x17a52ae2}, + {0x3287a80a, 0x00000026, 0x00000496, 0x886d935a}, + {0xa4db423e, 0x00000023, 0x0000045d, 0xeaaeaeb2}, + {0x7a1078df, 0x00000015, 0x0000014a, 0x8e900a4b}, + {0x6048bd5b, 0x00000006, 0x0000006a, 0xd74662b1}, + {0xd8f9ea20, 0x0000003d, 0x00000277, 0xd26752ba}, + {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x8b1fcd62}, + {0x2dfb005d, 0x00000016, 0x00000345, 0xf54342fe}, + {0x5a214ade, 0x00000020, 0x000005b6, 0x5b95b988}, + {0xf0ab9cca, 0x00000032, 0x00000515, 0x2e1176be}, + {0x91b444f9, 0x0000002e, 0x000007f8, 0x66120546}, + {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xf256a5cc}, + {0xd824d1bb, 0x0000003a, 0x000007b5, 0x4af1dd69}, + {0x0470180c, 0x00000034, 0x000001f0, 0x56f0a04a}, + {0xffaa3a3f, 0x00000036, 0x00000299, 0x74f6b6b2}, + {0x6406cfeb, 0x00000023, 0x00000600, 0x085951fd}, + {0xb24aaa38, 0x0000003e, 0x000004a1, 0xc65387eb}, + {0x58b2ab7c, 0x00000039, 0x000002b4, 0x1ca9257b}, + {0x3db85970, 0x00000006, 0x000002b6, 0xfd196d76}, + {0x857830c5, 0x00000003, 0x00000590, 0x5ef88339}, + {0xe1fcd978, 0x0000003e, 0x000007d8, 0x2c3714d9}, + {0xb982a768, 0x00000016, 0x000006e0, 0x58576548}, + {0x1d581ce8, 0x0000001e, 0x0000058b, 0xfd7c57de}, + {0x2456719b, 0x00000025, 0x00000503, 0xd5fedd59}, + {0xfae6d8f2, 0x00000000, 0x0000055d, 0x1cc3b17b}, + {0xcba828e3, 0x00000039, 0x000002ce, 0x270eed73}, + {0x13d25952, 0x0000000a, 0x0000072d, 0x91ecbb11}, + {0x0342be3f, 0x00000015, 0x00000599, 0x05ed8d0c}, + {0xeaa344e0, 0x00000014, 0x000004d8, 0x0b09ad5b}, + {0xbbb52021, 0x0000003b, 0x00000272, 0xf8d511fb}, + {0xb66384dc, 0x0000001d, 0x000007fc, 0x5ad832cc}, + {0x616c01b6, 0x00000022, 0x000002c8, 0x1214d196}, + {0xce2bdaad, 0x00000016, 0x0000062a, 0x5747218a}, + {0x00fe84d7, 0x00000005, 0x00000205, 0xde8f14de}, + {0xbebdcb4c, 0x00000006, 0x0000055d, 0x3563b7b9}, + {0xd8b1a02a, 0x00000010, 0x00000387, 0x071475d0}, + {0x3b96cad2, 0x00000036, 0x00000347, 0x54c79d60}, + {0xc94c1ed7, 0x00000005, 0x0000038b, 0x4c53eee6}, + {0x1aad454e, 0x00000025, 0x000002b2, 0x10137a3c}, + {0xa4fec9a6, 0x00000000, 0x000006d6, 0xaa9d6c73}, + {0x1bbe71e2, 0x0000001f, 0x000002fd, 0xb63d23e7}, + {0x4201c7e4, 0x00000002, 0x000002b7, 0x7f53e9cf}, + {0x23fddc96, 0x00000003, 0x00000627, 0x13c1cd83}, + {0xd82ba25c, 0x00000016, 0x0000063e, 0x49ff5867}, + {0x786f2032, 0x0000002d, 0x0000060f, 0x8467f211}, + {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x3f9683b2}, + {0x1a6e0a39, 0x00000008, 0x00000672, 0x76a3f874}, + {0x56000ab8, 0x0000000e, 0x000000e5, 0x863b702f}, + {0x4717fe0c, 0x00000000, 0x000006ec, 0xdc6c58ff}, + {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x0622cc95}, + {0xc25dd6c6, 0x00000024, 0x000006c0, 0xe85605cd}, + {0xe9b11300, 0x00000023, 0x00000683, 0x31da5f06}, + {0x95cd285e, 0x00000001, 0x00000047, 0xa1f2e784}, + {0xd9245a25, 0x0000001e, 0x000003a6, 0xb07cc616}, + {0x103279db, 0x00000006, 0x0000039b, 0xbf943b6c}, + {0x1cba3172, 0x00000027, 0x000001c8, 0x2c01af1c}, + {0x8f613739, 0x0000000c, 0x000001df, 0x0fe5f56d}, + {0x1c6aa90d, 0x0000001b, 0x0000053c, 0xf8943b2d}, + {0xaabe5b93, 0x0000003d, 0x00000715, 0xe4d89272}, + {0xf15dd038, 0x00000006, 0x000006db, 0x7c2f6bbb}, + {0x584dd49c, 0x00000020, 0x000007bc, 0xabbf388b}, + {0x5d8c9506, 0x00000020, 0x00000470, 0x1dca1f4e}, + {0xb80d17b0, 0x00000032, 0x00000346, 0x5c170e23}, + {0xdaf0592e, 0x00000023, 0x000007b0, 0xc0e9d672}, + {0x4793cc85, 0x0000000d, 0x00000706, 0xc18bdc86}, + {0x82ebf64e, 0x00000009, 0x000007c3, 0xa874fcdd}, + {0xb18a0319, 0x00000026, 0x000007db, 0x9dc0bb48}, +}; + +static int crc32c_test(void) +{ + int i; + int errors = 0; + int bytes = 0; + struct timeval start, stop; + uint64_t usec; + + /* 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); + } + + gettimeofday(&start, NULL); + 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++; + } + gettimeofday(&stop, NULL); + + usec = stop.tv_usec - start.tv_usec + + 1000000 * (stop.tv_sec - start.tv_sec); + + if (errors) + printf("crc32c: %d self tests failed\n", errors); + else { + printf("crc32c: tests passed, %d bytes in %" PRIu64 " usec\n", + bytes, usec); + } + + return errors; +} + +/* + * make sure we always return 0 for a successful test run, and non-zero for a + * failed run. The build infrastructure is looking for this information to + * determine whether to allow the build to proceed. + */ +int main(int argc, char **argv) +{ + int errors; + + printf("CRC_LE_BITS = %d\n", CRC_LE_BITS); + + errors = crc32c_test(); + + return errors != 0; +} +#endif /* CRC32_SELFTEST */ diff --git a/libfrog/crc32defs.h b/libfrog/crc32defs.h new file mode 100644 index 00000000..57c328c2 --- /dev/null +++ b/libfrog/crc32defs.h @@ -0,0 +1,49 @@ +/* + * Use slice-by-8, which is the fastest variant. + * + * Calculate checksum 8 bytes at a time with a clever slicing algorithm. + * This is the fastest algorithm, but comes with a 8KiB lookup table. + * Most modern processors have enough cache to hold this table without + * thrashing the cache. + * + * The Linux kernel uses this as the default implementation "unless you + * have a good reason not to". The reason why Kconfig urges you to pick + * SLICEBY8 is because people challenged the assertion that we should + * always use slice by 8, so Darrick wrote a crc microbenchmark utility + * and ran it on as many machines as he could get his hands on to show + * that sb8 was the fastest. + * + * Every 64-bit machine (and most of the 32-bit ones too) saw the best + * results with sb8. Any machine with more than 4K of cache saw better + * results. The spreadsheet still exists today[1]; note that + * 'crc32-kern-le' corresponds to the slice by 4 algorithm which is the + * default unless CRC_LE_BITS is defined explicitly. + * + * FWIW, there are a handful of board defconfigs in the kernel that + * don't pick sliceby8. These are all embedded 32-bit mips/ppc systems + * with very small cache sizes which experience cache thrashing with the + * slice by 8 algorithm, and therefore chose to pick defaults that are + * saner for their particular board configuration. For nearly all of + * XFS' perceived userbase (which we assume are 32 and 64-bit machines + * with sufficiently large CPU cache and largeish storage devices) slice + * by 8 is the right choice. + * + * [1] https://goo.gl/0LSzsG ("crc32c_bench") + */ +#define CRC_LE_BITS 64 + +/* + * This is the CRC32c polynomial, as outlined by Castagnoli. + * x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+ + * x^8+x^6+x^0 + */ +#define CRC32C_POLY_LE 0x82F63B78 + +/* + * Little-endian CRC computation. Used with serial bit streams sent + * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. + */ +#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ + CRC_LE_BITS & CRC_LE_BITS-1 +# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" +#endif diff --git a/libfrog/gen_crc32table.c b/libfrog/gen_crc32table.c new file mode 100644 index 00000000..d5724326 --- /dev/null +++ b/libfrog/gen_crc32table.c @@ -0,0 +1,80 @@ +#include <stdio.h> +#include "crc32defs.h" +#include <inttypes.h> + +#define ENTRIES_PER_LINE 4 + +#if CRC_LE_BITS > 8 +# define LE_TABLE_ROWS (CRC_LE_BITS/8) +# define LE_TABLE_SIZE 256 +#else +# define LE_TABLE_ROWS 1 +# define LE_TABLE_SIZE (1 << CRC_LE_BITS) +#endif + +static uint32_t crc32ctable_le[LE_TABLE_ROWS][256]; + +/** + * crc32init_le() - allocate and initialize LE table data + * + * crc is the crc of the byte i; other entries are filled in based on the + * fact that crctable[i^j] = crctable[i] ^ crctable[j]. + * + */ +static void crc32init_le_generic(const uint32_t polynomial, + uint32_t (*tab)[256]) +{ + unsigned i, j; + uint32_t crc = 1; + + tab[0][0] = 0; + + for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) { + crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0); + for (j = 0; j < LE_TABLE_SIZE; j += 2 * i) + tab[0][i + j] = crc ^ tab[0][j]; + } + for (i = 0; i < LE_TABLE_SIZE; i++) { + crc = tab[0][i]; + for (j = 1; j < LE_TABLE_ROWS; j++) { + crc = tab[0][crc & 0xff] ^ (crc >> 8); + tab[j][i] = crc; + } + } +} + +static void crc32cinit_le(void) +{ + crc32init_le_generic(CRC32C_POLY_LE, crc32ctable_le); +} + +static void output_table(uint32_t (*table)[256], int rows, int len, char *trans) +{ + int i, j; + + for (j = 0 ; j < rows; j++) { + printf("{"); + for (i = 0; i < len - 1; i++) { + if (i % ENTRIES_PER_LINE == 0) + printf("\n"); + printf("%s(0x%8.8xL), ", trans, table[j][i]); + } + printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]); + } +} + +int main(int argc, char** argv) +{ + printf("/* this file is generated - do not edit */\n\n"); + + if (CRC_LE_BITS > 1) { + crc32cinit_le(); + printf("static u32 crc32ctable_le[%d][%d] = {", + LE_TABLE_ROWS, LE_TABLE_SIZE); + output_table(crc32ctable_le, LE_TABLE_ROWS, + LE_TABLE_SIZE, "tole"); + printf("};\n"); + } + + return 0; +} diff --git a/libxfs/Makefile b/libxfs/Makefile index 42ce0f8a..3cbfc9ff 100644 --- a/libxfs/Makefile +++ b/libxfs/Makefile @@ -48,13 +48,10 @@ HFILES = \ libxfs_io.h \ libxfs_api_defs.h \ init.h \ - crc32defs.h \ - crc32table.h \ libxfs_priv.h \ xfs_dir2_priv.h CFILES = cache.c \ - crc32.c \ defer_item.c \ init.c \ kmem.c \ @@ -99,8 +96,6 @@ CFILES = cache.c \ xfs_trans_resv.c \ xfs_types.c -LSRCFILES += gen_crc32table.c - # # Tracing flags: # -DIO_DEBUG reads and writes of buffers @@ -117,25 +112,7 @@ LTLIBS = $(LIBPTHREAD) $(LIBRT) # don't try linking xfs_repair with a debug libxfs. DEBUG = -DNDEBUG -LDIRT = gen_crc32table crc32table.h crc32selftest - -default: crc32selftest ltdepend $(LTLIBRARY) - -crc32table.h: gen_crc32table.c crc32defs.h - @echo " [CC] gen_crc32table" - $(Q) $(BUILD_CC) $(BUILD_CFLAGS) -o gen_crc32table $< - @echo " [GENERATE] $@" - $(Q) ./gen_crc32table > crc32table.h - -# The selftest binary will return an error if it fails. This is made a -# dependency of the build process so that we refuse to build the tools on broken -# systems/architectures. Hence we make sure that xfsprogs will never use a -# busted CRC calculation at build time and hence avoid putting bad CRCs down on -# disk. -crc32selftest: gen_crc32table.c crc32table.h crc32.c crc32defs.h - @echo " [TEST] CRC32" - $(Q) $(BUILD_CC) $(BUILD_CFLAGS) -D CRC32_SELFTEST=1 crc32.c -o $@ - $(Q) ./$@ +default: ltdepend $(LTLIBRARY) # set up include/xfs header directory include $(BUILDRULES) diff --git a/libxfs/crc32.c b/libxfs/crc32.c deleted file mode 100644 index a80a0c54..00000000 --- a/libxfs/crc32.c +++ /dev/null @@ -1,869 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * 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@xxxxxxxx> - * Nicer crc32 functions/docs submitted by linux@xxxxxxxxxxx. 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@xxxxxxxx> - * 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. - */ - -/* see: Documentation/crc32.txt for a description of algorithms */ - -/* - * lifted from the 3.8-rc2 kernel source for xfsprogs. Killed CONFIG_X86 - * specific bits for just the generic algorithm. Also removed the big endian - * version of the algorithm as XFS only uses the little endian CRC version to - * match the hardware acceleration available on Intel CPUs. - */ - -#include "platform_defs.h" -#include "xfs.h" -#include "xfs_arch.h" -#include "crc32defs.h" - -/* types specifc to this file */ -typedef __u8 u8; -typedef __u16 u16; -typedef __u32 u32; -typedef __u32 u64; -#define __pure - -#if CRC_LE_BITS > 8 -# define tole(x) ((__force u32) __constant_cpu_to_le32(x)) -#else -# define tole(x) (x) -#endif - -#include "crc32table.h" - -#if CRC_LE_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]) -{ -#if __BYTE_ORDER == __LITTLE_ENDIAN -# define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8) -# 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]) -# elif __BYTE_ORDER == __BIG_ENDIAN -# define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) -# 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]) -# else -# error What endian are you? -# endif - const u32 *b; - size_t rem_len; - const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3]; -# if CRC_LE_BITS != 32 - const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7]; -# endif - u32 q; - - /* Align it */ - if (((long)buf & 3) && len) { - do { - DO_CRC(*buf++); - } while ((--len) && ((long)buf)&3); - } - -# if CRC_LE_BITS == 32 - rem_len = len & 3; - len = len >> 2; -# else - rem_len = len & 7; - len = len >> 3; -# endif - - b = (const u32 *)buf; - for (--b; len; --len) { - 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; - do { - DO_CRC(*++p); /* use pre increment for speed */ - } while (--len); - } - 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 - * other uses, or the previous crc32 value if computing incrementally. - * @p: pointer to buffer over which CRC is run - * @len: length of buffer @p - */ -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) ? 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]; - } -# elif CRC_LE_BITS == 4 - while (len--) { - crc ^= *p++; - crc = (crc >> 4) ^ tab[0][crc & 15]; - crc = (crc >> 4) ^ tab[0][crc & 15]; - } -# elif CRC_LE_BITS == 8 - /* aka Sarwate algorithm */ - while (len--) { - crc ^= *p++; - 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; -} - -#if CRC_LE_BITS == 1 -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 crc32c_le(u32 crc, unsigned char const *p, size_t len) -{ - return crc32_le_generic(crc, p, len, - (const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE); -} -#endif - - -#ifdef CRC32_SELFTEST - -/* 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, 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, - 0x4c, 0x1b, 0x8a, 0x04, 0xa8, 0x09, 0x69, 0x8b, - 0xea, 0xc6, 0x55, 0x8e, 0x57, 0xe6, 0x64, 0x35, - 0xf0, 0xc7, 0x16, 0x9f, 0x5d, 0x5e, 0x86, 0x40, - 0x46, 0xbb, 0xe5, 0x45, 0x88, 0xfe, 0xc9, 0x63, - 0x15, 0xfb, 0xf5, 0xbd, 0x71, 0x61, 0xeb, 0x7b, - 0x78, 0x70, 0x07, 0x31, 0x03, 0x9f, 0xb2, 0xc8, - 0xa7, 0xab, 0x47, 0xfd, 0xdf, 0xa0, 0x78, 0x72, - 0xa4, 0x2a, 0xe4, 0xb6, 0xba, 0xc0, 0x1e, 0x86, - 0x71, 0xe6, 0x3d, 0x18, 0x37, 0x70, 0xe6, 0xff, - 0xe0, 0xbc, 0x0b, 0x22, 0xa0, 0x1f, 0xd3, 0xed, - 0xa2, 0x55, 0x39, 0xab, 0xa8, 0x13, 0x73, 0x7c, - 0x3f, 0xb2, 0xd6, 0x19, 0xac, 0xff, 0x99, 0xed, - 0xe8, 0xe6, 0xa6, 0x22, 0xe3, 0x9c, 0xf1, 0x30, - 0xdc, 0x01, 0x0a, 0x56, 0xfa, 0xe4, 0xc9, 0x99, - 0xdd, 0xa8, 0xd8, 0xda, 0x35, 0x51, 0x73, 0xb4, - 0x40, 0x86, 0x85, 0xdb, 0x5c, 0xd5, 0x85, 0x80, - 0x14, 0x9c, 0xfd, 0x98, 0xa9, 0x82, 0xc5, 0x37, - 0xff, 0x32, 0x5d, 0xd0, 0x0b, 0xfa, 0xdc, 0x04, - 0x5e, 0x09, 0xd2, 0xca, 0x17, 0x4b, 0x1a, 0x8e, - 0x15, 0xe1, 0xcc, 0x4e, 0x52, 0x88, 0x35, 0xbd, - 0x48, 0xfe, 0x15, 0xa0, 0x91, 0xfd, 0x7e, 0x6c, - 0x0e, 0x5d, 0x79, 0x1b, 0x81, 0x79, 0xd2, 0x09, - 0x34, 0x70, 0x3d, 0x81, 0xec, 0xf6, 0x24, 0xbb, - 0xfb, 0xf1, 0x7b, 0xdf, 0x54, 0xea, 0x80, 0x9b, - 0xc7, 0x99, 0x9e, 0xbd, 0x16, 0x78, 0x12, 0x53, - 0x5e, 0x01, 0xa7, 0x4e, 0xbd, 0x67, 0xe1, 0x9b, - 0x4c, 0x0e, 0x61, 0x45, 0x97, 0xd2, 0xf0, 0x0f, - 0xfe, 0x15, 0x08, 0xb7, 0x11, 0x4c, 0xe7, 0xff, - 0x81, 0x53, 0xff, 0x91, 0x25, 0x38, 0x7e, 0x40, - 0x94, 0xe5, 0xe0, 0xad, 0xe6, 0xd9, 0x79, 0xb6, - 0x92, 0xc9, 0xfc, 0xde, 0xc3, 0x1a, 0x23, 0xbb, - 0xdd, 0xc8, 0x51, 0x0c, 0x3a, 0x72, 0xfa, 0x73, - 0x6f, 0xb7, 0xee, 0x61, 0x39, 0x03, 0x01, 0x3f, - 0x7f, 0x94, 0x2e, 0x2e, 0xba, 0x3a, 0xbb, 0xb4, - 0xfa, 0x6a, 0x17, 0xfe, 0xea, 0xef, 0x5e, 0x66, - 0x97, 0x3f, 0x32, 0x3d, 0xd7, 0x3e, 0xb1, 0xf1, - 0x6c, 0x14, 0x4c, 0xfd, 0x37, 0xd3, 0x38, 0x80, - 0xfb, 0xde, 0xa6, 0x24, 0x1e, 0xc8, 0xca, 0x7f, - 0x3a, 0x93, 0xd8, 0x8b, 0x18, 0x13, 0xb2, 0xe5, - 0xe4, 0x93, 0x05, 0x53, 0x4f, 0x84, 0x66, 0xa7, - 0x58, 0x5c, 0x7b, 0x86, 0x52, 0x6d, 0x0d, 0xce, - 0xa4, 0x30, 0x7d, 0xb6, 0x18, 0x9f, 0xeb, 0xff, - 0x22, 0xbb, 0x72, 0x29, 0xb9, 0x44, 0x0b, 0x48, - 0x1e, 0x84, 0x71, 0x81, 0xe3, 0x6d, 0x73, 0x26, - 0x92, 0xb4, 0x4d, 0x2a, 0x29, 0xb8, 0x1f, 0x72, - 0xed, 0xd0, 0xe1, 0x64, 0x77, 0xea, 0x8e, 0x88, - 0x0f, 0xef, 0x3f, 0xb1, 0x3b, 0xad, 0xf9, 0xc9, - 0x8b, 0xd0, 0xac, 0xc6, 0xcc, 0xa9, 0x40, 0xcc, - 0x76, 0xf6, 0x3b, 0x53, 0xb5, 0x88, 0xcb, 0xc8, - 0x37, 0xf1, 0xa2, 0xba, 0x23, 0x15, 0x99, 0x09, - 0xcc, 0xe7, 0x7a, 0x3b, 0x37, 0xf7, 0x58, 0xc8, - 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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 crc32c_le; /* expected crc32c_le result */ -} test[] = -{ - {0x674bf11d, 0x00000038, 0x00000542, 0xf6e93d6c}, - {0x35c672c6, 0x0000003a, 0x000001aa, 0x0fe92aca}, - {0x496da28e, 0x00000039, 0x000005af, 0x52e1ebb8}, - {0x09a9b90e, 0x00000027, 0x000001f8, 0x0798af9a}, - {0xdc97e5a9, 0x00000025, 0x000003b6, 0x18eb3152}, - {0x47c58900, 0x0000000a, 0x000000b9, 0xd00d08c7}, - {0x292561e8, 0x0000000c, 0x00000403, 0x8ba966bc}, - {0x415037f6, 0x00000003, 0x00000676, 0x11d694a2}, - {0x3466e707, 0x00000026, 0x00000042, 0x6ab3208d}, - {0xafd1281b, 0x00000023, 0x000002ee, 0xba4603c5}, - {0xd3857b18, 0x00000028, 0x000004a2, 0xe6071c6f}, - {0x1d825a8f, 0x0000002b, 0x0000050b, 0x179ec30a}, - {0x5033e3bc, 0x0000000b, 0x00000078, 0x0903beb8}, - {0x94f1fb5e, 0x0000000f, 0x000003a2, 0x6a7cb4fa}, - {0xc9a0fe14, 0x00000009, 0x00000473, 0xdb535801}, - {0x88a034b1, 0x0000001c, 0x000005ad, 0x92bed597}, - {0xf0f72239, 0x00000020, 0x0000026d, 0x192a3f1b}, - {0xcc20a5e3, 0x0000003b, 0x0000067a, 0xccbaec1a}, - {0xce589c95, 0x0000002b, 0x00000641, 0x7eabae4d}, - {0x78edc885, 0x00000035, 0x000005be, 0x28c72982}, - {0x9d40a377, 0x0000003b, 0x00000038, 0xc3cd4d18}, - {0x703d0e01, 0x0000003c, 0x000006f1, 0xbca8f0e7}, - {0x776bf505, 0x0000000f, 0x000005b2, 0x713f60b3}, - {0x4a3e7854, 0x00000027, 0x000004b8, 0xebd08fd5}, - {0x209172dd, 0x0000003b, 0x00000356, 0x64406c59}, - {0x3ba4cc5b, 0x0000002f, 0x00000203, 0x7421890e}, - {0xfc62f297, 0x00000000, 0x00000079, 0xe9347603}, - {0x64280b8b, 0x00000016, 0x000007ab, 0x1bef9060}, - {0x97dd724b, 0x00000033, 0x000007ad, 0x34720072}, - {0x61394b52, 0x00000035, 0x00000571, 0x48310f59}, - {0x29b4faff, 0x00000024, 0x0000006e, 0x783a4213}, - {0x29bfb1dc, 0x0000000b, 0x00000244, 0x9e8efd41}, - {0x86ae934b, 0x00000035, 0x00000104, 0xfc3d34a5}, - {0xc4c1024e, 0x0000002e, 0x000006b1, 0x17a52ae2}, - {0x3287a80a, 0x00000026, 0x00000496, 0x886d935a}, - {0xa4db423e, 0x00000023, 0x0000045d, 0xeaaeaeb2}, - {0x7a1078df, 0x00000015, 0x0000014a, 0x8e900a4b}, - {0x6048bd5b, 0x00000006, 0x0000006a, 0xd74662b1}, - {0xd8f9ea20, 0x0000003d, 0x00000277, 0xd26752ba}, - {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x8b1fcd62}, - {0x2dfb005d, 0x00000016, 0x00000345, 0xf54342fe}, - {0x5a214ade, 0x00000020, 0x000005b6, 0x5b95b988}, - {0xf0ab9cca, 0x00000032, 0x00000515, 0x2e1176be}, - {0x91b444f9, 0x0000002e, 0x000007f8, 0x66120546}, - {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xf256a5cc}, - {0xd824d1bb, 0x0000003a, 0x000007b5, 0x4af1dd69}, - {0x0470180c, 0x00000034, 0x000001f0, 0x56f0a04a}, - {0xffaa3a3f, 0x00000036, 0x00000299, 0x74f6b6b2}, - {0x6406cfeb, 0x00000023, 0x00000600, 0x085951fd}, - {0xb24aaa38, 0x0000003e, 0x000004a1, 0xc65387eb}, - {0x58b2ab7c, 0x00000039, 0x000002b4, 0x1ca9257b}, - {0x3db85970, 0x00000006, 0x000002b6, 0xfd196d76}, - {0x857830c5, 0x00000003, 0x00000590, 0x5ef88339}, - {0xe1fcd978, 0x0000003e, 0x000007d8, 0x2c3714d9}, - {0xb982a768, 0x00000016, 0x000006e0, 0x58576548}, - {0x1d581ce8, 0x0000001e, 0x0000058b, 0xfd7c57de}, - {0x2456719b, 0x00000025, 0x00000503, 0xd5fedd59}, - {0xfae6d8f2, 0x00000000, 0x0000055d, 0x1cc3b17b}, - {0xcba828e3, 0x00000039, 0x000002ce, 0x270eed73}, - {0x13d25952, 0x0000000a, 0x0000072d, 0x91ecbb11}, - {0x0342be3f, 0x00000015, 0x00000599, 0x05ed8d0c}, - {0xeaa344e0, 0x00000014, 0x000004d8, 0x0b09ad5b}, - {0xbbb52021, 0x0000003b, 0x00000272, 0xf8d511fb}, - {0xb66384dc, 0x0000001d, 0x000007fc, 0x5ad832cc}, - {0x616c01b6, 0x00000022, 0x000002c8, 0x1214d196}, - {0xce2bdaad, 0x00000016, 0x0000062a, 0x5747218a}, - {0x00fe84d7, 0x00000005, 0x00000205, 0xde8f14de}, - {0xbebdcb4c, 0x00000006, 0x0000055d, 0x3563b7b9}, - {0xd8b1a02a, 0x00000010, 0x00000387, 0x071475d0}, - {0x3b96cad2, 0x00000036, 0x00000347, 0x54c79d60}, - {0xc94c1ed7, 0x00000005, 0x0000038b, 0x4c53eee6}, - {0x1aad454e, 0x00000025, 0x000002b2, 0x10137a3c}, - {0xa4fec9a6, 0x00000000, 0x000006d6, 0xaa9d6c73}, - {0x1bbe71e2, 0x0000001f, 0x000002fd, 0xb63d23e7}, - {0x4201c7e4, 0x00000002, 0x000002b7, 0x7f53e9cf}, - {0x23fddc96, 0x00000003, 0x00000627, 0x13c1cd83}, - {0xd82ba25c, 0x00000016, 0x0000063e, 0x49ff5867}, - {0x786f2032, 0x0000002d, 0x0000060f, 0x8467f211}, - {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x3f9683b2}, - {0x1a6e0a39, 0x00000008, 0x00000672, 0x76a3f874}, - {0x56000ab8, 0x0000000e, 0x000000e5, 0x863b702f}, - {0x4717fe0c, 0x00000000, 0x000006ec, 0xdc6c58ff}, - {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x0622cc95}, - {0xc25dd6c6, 0x00000024, 0x000006c0, 0xe85605cd}, - {0xe9b11300, 0x00000023, 0x00000683, 0x31da5f06}, - {0x95cd285e, 0x00000001, 0x00000047, 0xa1f2e784}, - {0xd9245a25, 0x0000001e, 0x000003a6, 0xb07cc616}, - {0x103279db, 0x00000006, 0x0000039b, 0xbf943b6c}, - {0x1cba3172, 0x00000027, 0x000001c8, 0x2c01af1c}, - {0x8f613739, 0x0000000c, 0x000001df, 0x0fe5f56d}, - {0x1c6aa90d, 0x0000001b, 0x0000053c, 0xf8943b2d}, - {0xaabe5b93, 0x0000003d, 0x00000715, 0xe4d89272}, - {0xf15dd038, 0x00000006, 0x000006db, 0x7c2f6bbb}, - {0x584dd49c, 0x00000020, 0x000007bc, 0xabbf388b}, - {0x5d8c9506, 0x00000020, 0x00000470, 0x1dca1f4e}, - {0xb80d17b0, 0x00000032, 0x00000346, 0x5c170e23}, - {0xdaf0592e, 0x00000023, 0x000007b0, 0xc0e9d672}, - {0x4793cc85, 0x0000000d, 0x00000706, 0xc18bdc86}, - {0x82ebf64e, 0x00000009, 0x000007c3, 0xa874fcdd}, - {0xb18a0319, 0x00000026, 0x000007db, 0x9dc0bb48}, -}; - -static int crc32c_test(void) -{ - int i; - int errors = 0; - int bytes = 0; - struct timeval start, stop; - uint64_t usec; - - /* 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); - } - - gettimeofday(&start, NULL); - 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++; - } - gettimeofday(&stop, NULL); - - usec = stop.tv_usec - start.tv_usec + - 1000000 * (stop.tv_sec - start.tv_sec); - - if (errors) - printf("crc32c: %d self tests failed\n", errors); - else { - printf("crc32c: tests passed, %d bytes in %" PRIu64 " usec\n", - bytes, usec); - } - - return errors; -} - -/* - * make sure we always return 0 for a successful test run, and non-zero for a - * failed run. The build infrastructure is looking for this information to - * determine whether to allow the build to proceed. - */ -int main(int argc, char **argv) -{ - int errors; - - printf("CRC_LE_BITS = %d\n", CRC_LE_BITS); - - errors = crc32c_test(); - - return errors != 0; -} -#endif /* CRC32_SELFTEST */ diff --git a/libxfs/crc32defs.h b/libxfs/crc32defs.h deleted file mode 100644 index 57c328c2..00000000 --- a/libxfs/crc32defs.h +++ /dev/null @@ -1,49 +0,0 @@ -/* - * Use slice-by-8, which is the fastest variant. - * - * Calculate checksum 8 bytes at a time with a clever slicing algorithm. - * This is the fastest algorithm, but comes with a 8KiB lookup table. - * Most modern processors have enough cache to hold this table without - * thrashing the cache. - * - * The Linux kernel uses this as the default implementation "unless you - * have a good reason not to". The reason why Kconfig urges you to pick - * SLICEBY8 is because people challenged the assertion that we should - * always use slice by 8, so Darrick wrote a crc microbenchmark utility - * and ran it on as many machines as he could get his hands on to show - * that sb8 was the fastest. - * - * Every 64-bit machine (and most of the 32-bit ones too) saw the best - * results with sb8. Any machine with more than 4K of cache saw better - * results. The spreadsheet still exists today[1]; note that - * 'crc32-kern-le' corresponds to the slice by 4 algorithm which is the - * default unless CRC_LE_BITS is defined explicitly. - * - * FWIW, there are a handful of board defconfigs in the kernel that - * don't pick sliceby8. These are all embedded 32-bit mips/ppc systems - * with very small cache sizes which experience cache thrashing with the - * slice by 8 algorithm, and therefore chose to pick defaults that are - * saner for their particular board configuration. For nearly all of - * XFS' perceived userbase (which we assume are 32 and 64-bit machines - * with sufficiently large CPU cache and largeish storage devices) slice - * by 8 is the right choice. - * - * [1] https://goo.gl/0LSzsG ("crc32c_bench") - */ -#define CRC_LE_BITS 64 - -/* - * This is the CRC32c polynomial, as outlined by Castagnoli. - * x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+ - * x^8+x^6+x^0 - */ -#define CRC32C_POLY_LE 0x82F63B78 - -/* - * Little-endian CRC computation. Used with serial bit streams sent - * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. - */ -#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ - CRC_LE_BITS & CRC_LE_BITS-1 -# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" -#endif diff --git a/libxfs/gen_crc32table.c b/libxfs/gen_crc32table.c deleted file mode 100644 index d5724326..00000000 --- a/libxfs/gen_crc32table.c +++ /dev/null @@ -1,80 +0,0 @@ -#include <stdio.h> -#include "crc32defs.h" -#include <inttypes.h> - -#define ENTRIES_PER_LINE 4 - -#if CRC_LE_BITS > 8 -# define LE_TABLE_ROWS (CRC_LE_BITS/8) -# define LE_TABLE_SIZE 256 -#else -# define LE_TABLE_ROWS 1 -# define LE_TABLE_SIZE (1 << CRC_LE_BITS) -#endif - -static uint32_t crc32ctable_le[LE_TABLE_ROWS][256]; - -/** - * crc32init_le() - allocate and initialize LE table data - * - * crc is the crc of the byte i; other entries are filled in based on the - * fact that crctable[i^j] = crctable[i] ^ crctable[j]. - * - */ -static void crc32init_le_generic(const uint32_t polynomial, - uint32_t (*tab)[256]) -{ - unsigned i, j; - uint32_t crc = 1; - - tab[0][0] = 0; - - for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) { - crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0); - for (j = 0; j < LE_TABLE_SIZE; j += 2 * i) - tab[0][i + j] = crc ^ tab[0][j]; - } - for (i = 0; i < LE_TABLE_SIZE; i++) { - crc = tab[0][i]; - for (j = 1; j < LE_TABLE_ROWS; j++) { - crc = tab[0][crc & 0xff] ^ (crc >> 8); - tab[j][i] = crc; - } - } -} - -static void crc32cinit_le(void) -{ - crc32init_le_generic(CRC32C_POLY_LE, crc32ctable_le); -} - -static void output_table(uint32_t (*table)[256], int rows, int len, char *trans) -{ - int i, j; - - for (j = 0 ; j < rows; j++) { - printf("{"); - for (i = 0; i < len - 1; i++) { - if (i % ENTRIES_PER_LINE == 0) - printf("\n"); - printf("%s(0x%8.8xL), ", trans, table[j][i]); - } - printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]); - } -} - -int main(int argc, char** argv) -{ - printf("/* this file is generated - do not edit */\n\n"); - - if (CRC_LE_BITS > 1) { - crc32cinit_le(); - printf("static u32 crc32ctable_le[%d][%d] = {", - LE_TABLE_ROWS, LE_TABLE_SIZE); - output_table(crc32ctable_le, LE_TABLE_ROWS, - LE_TABLE_SIZE, "tole"); - printf("};\n"); - } - - return 0; -} diff --git a/libxfs/libxfs_priv.h b/libxfs/libxfs_priv.h index 85f13950..bc205cb7 100644 --- a/libxfs/libxfs_priv.h +++ b/libxfs/libxfs_priv.h @@ -53,9 +53,9 @@ #include "xfs_arch.h" #include "xfs_fs.h" +#include "crc32c.h" /* CRC stuff, buffer API dependent on it */ -extern uint32_t crc32c_le(uint32_t crc, unsigned char const *p, size_t len); #define crc32c(c,p,l) crc32c_le((c),(unsigned char const *)(p),(l)) #include "xfs_cksum.h" -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html