From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756836AbdACTGE (ORCPT ); Tue, 3 Jan 2017 14:06:04 -0500 Received: from michel.telenet-ops.be ([195.130.137.88]:34438 "EHLO michel.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757314AbdACTFC (ORCPT ); Tue, 3 Jan 2017 14:05:02 -0500 From: Geert Uytterhoeven To: Andrew Morton Cc: Matt Domsch , Luca Barbieri , George Spelvin , linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 1/3] lib: Add module support to crc32 tests Date: Tue, 3 Jan 2017 20:04:34 +0100 Message-Id: <1483470276-10517-1-git-send-email-geert@linux-m68k.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Extract the crc32 test code into its own source file, to allow to compile it either to a loadable module, or builtin into the kernel. Signed-off-by: Geert Uytterhoeven --- lib/Kconfig | 3 +- lib/Makefile | 1 + lib/crc32.c | 824 ------------------------------------------- lib/{crc32.c => crc32test.c} | 320 +---------------- 4 files changed, 7 insertions(+), 1141 deletions(-) copy lib/{crc32.c => crc32test.c} (82%) diff --git a/lib/Kconfig b/lib/Kconfig index 260a80e313b9022a..0095b828f2384691 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -103,8 +103,7 @@ config CRC32 functions require M here. config CRC32_SELFTEST - bool "CRC32 perform self test on init" - default n + tristate "CRC32 perform self test on init" depends on CRC32 help This option enables the CRC32 library functions to perform a diff --git a/lib/Makefile b/lib/Makefile index bc4073a8cd08da83..ef723f8d3c1dd9d8 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -90,6 +90,7 @@ obj-$(CONFIG_CRC16) += crc16.o obj-$(CONFIG_CRC_T10DIF)+= crc-t10dif.o obj-$(CONFIG_CRC_ITU_T) += crc-itu-t.o obj-$(CONFIG_CRC32) += crc32.o +obj-$(CONFIG_CRC32_SELFTEST) += crc32test.o obj-$(CONFIG_CRC7) += crc7.o obj-$(CONFIG_LIBCRC32C) += libcrc32c.o obj-$(CONFIG_CRC8) += crc8.o diff --git a/lib/crc32.c b/lib/crc32.c index 7fbd1a112b9d2474..6ddc92bc1460936f 100644 --- a/lib/crc32.c +++ b/lib/crc32.c @@ -340,827 +340,3 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) } #endif EXPORT_SYMBOL(crc32_be); - -#ifdef CONFIG_CRC32_SELFTEST - -/* 4096 random bytes */ -static u8 const __aligned(8) test_buf[] __initconst = -{ - 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, - 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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 */ - u32 crc32c_le; /* expected crc32c_le result */ -} const test[] __initconst = -{ - {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}, -}; - -#include - -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(); - - nsec = ktime_get_ns(); - 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++; - } - nsec = ktime_get_ns() - nsec; - - 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; -} - -static int __init crc32c_combine_test(void) -{ - int i, j; - int errors = 0, runs = 0; - - for (i = 0; i < 10; i++) { - 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++; - cond_resched(); - } - } - - 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; -} - -static int __init crc32_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 ^= 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); - } - - /* reduce OS noise */ - local_irq_save(flags); - local_irq_disable(); - - nsec = ktime_get_ns(); - 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++; - } - nsec = ktime_get_ns() - nsec; - - local_irq_restore(flags); - local_irq_enable(); - - 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); - } - - return 0; -} - -static int __init crc32_combine_test(void) -{ - int i, j; - int errors = 0, runs = 0; - - for (i = 0; i < 10; i++) { - 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++; - cond_resched(); - } - } - - 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; -} - -static int __init crc32test_init(void) -{ - crc32_test(); - crc32c_test(); - - crc32_combine_test(); - crc32c_combine_test(); - - return 0; -} - -static void __exit crc32_exit(void) -{ -} - -module_init(crc32test_init); -module_exit(crc32_exit); -#endif /* CONFIG_CRC32_SELFTEST */ diff --git a/lib/crc32.c b/lib/crc32test.c similarity index 82% copy from lib/crc32.c copy to lib/crc32test.c index 7fbd1a112b9d2474..97d6a57cefcc5d28 100644 --- a/lib/crc32.c +++ b/lib/crc32test.c @@ -24,324 +24,11 @@ * Version 2. See the file COPYING for more details. */ -/* see: Documentation/crc32.txt for a description of algorithms */ - #include #include -#include #include -#include "crc32defs.h" - -#if CRC_LE_BITS > 8 -# define tole(x) ((__force u32) cpu_to_le32(x)) -#else -# define tole(x) (x) -#endif - -#if CRC_BE_BITS > 8 -# define tobe(x) ((__force u32) cpu_to_be32(x)) -#else -# define tobe(x) (x) -#endif - -#include "crc32table.h" - -MODULE_AUTHOR("Matt Domsch "); -MODULE_DESCRIPTION("Various CRC32 calculations"); -MODULE_LICENSE("GPL"); - -#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8 - -/* implements slicing-by-4 or slicing-by-8 algorithm */ -static inline u32 __pure -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 (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 (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]; -# 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 (unlikely((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; -# ifdef CONFIG_X86 - --b; - for (i = 0; i < len; i++) { -# else - for (--b; len; --len) { -# 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_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 - * @len: length of buffer @p - * @tab: little-endian Ethernet table - * @polynomial: CRC32/CRC32c LE polynomial - */ -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 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, - (const u32 (*)[256])crc32table_le, CRCPOLY_LE); -} -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 -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) -{ - return crc32_generic_shift(crc, len, CRCPOLY_LE); -} - -u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len) -{ - return crc32_generic_shift(crc, len, CRC32C_POLY_LE); -} -EXPORT_SYMBOL(crc32_le_shift); -EXPORT_SYMBOL(__crc32c_le_shift); - -/** - * crc32_be_generic() - Calculate bitwise big-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 CRC32 is run - * @len: length of buffer @p - * @tab: big-endian Ethernet table - * @polynomial: CRC32 BE polynomial - */ -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) ? polynomial : - 0); - } -# 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) ^ tab[0][crc >> 28]; - crc = (crc << 4) ^ tab[0][crc >> 28]; - } -# elif CRC_BE_BITS == 8 - while (len--) { - crc ^= *p++ << 24; - crc = (crc << 8) ^ tab[0][crc >> 24]; - } -# 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; -} - -#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, - (const u32 (*)[256])crc32table_be, CRCPOLY_BE); -} -#endif -EXPORT_SYMBOL(crc32_be); - -#ifdef CONFIG_CRC32_SELFTEST +#include "crc32defs.h" /* 4096 random bytes */ static u8 const __aligned(8) test_buf[] __initconst = @@ -1163,4 +850,7 @@ static void __exit crc32_exit(void) module_init(crc32test_init); module_exit(crc32_exit); -#endif /* CONFIG_CRC32_SELFTEST */ + +MODULE_AUTHOR("Matt Domsch "); +MODULE_DESCRIPTION("CRC32 selftest"); +MODULE_LICENSE("GPL"); -- 1.9.1