From efba721f636ee016859d86d15748650119402b10 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Wed, 30 Oct 2013 11:50:50 +0100 Subject: [PATCH] lib: crc32: add test cases for crc32{, c}_combine routines We already have 100 test cases for crcs itself, so split the test buffer with a-prio known checksums, and test crc of two blocks against crc of the whole block for the same results. Output/result with CONFIG_CRC32_SELFTEST=y: [ 2.687095] crc32: CRC_LE_BITS = 64, CRC_BE BITS = 64 [ 2.687097] crc32: self tests passed, processed 225944 bytes in 278177 nsec [ 2.687383] crc32c: CRC_LE_BITS = 64 [ 2.687385] crc32c: self tests passed, processed 225944 bytes in 141708 nsec [ 7.336771] crc32_combine: 113072 self tests passed [ 12.050479] crc32c_combine: 113072 self tests passed [ 17.633089] alg: No test for crc32 (crc32-pclmul) Signed-off-by: Daniel Borkmann Cc: linux-kernel@vger.kernel.org Signed-off-by: David S. Miller --- lib/crc32.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) diff --git a/lib/crc32.c b/lib/crc32.c index 595205cddc30..69dd124f0cfc 100644 --- a/lib/crc32.c +++ b/lib/crc32.c @@ -1031,6 +1031,40 @@ static int __init crc32c_test(void) return 0; } +static int __init crc32c_combine_test(void) +{ + int i, j; + int errors = 0, runs = 0; + + for (i = 0; i < 100; 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++; + } + } + + 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; @@ -1090,10 +1124,48 @@ static int __init crc32_test(void) return 0; } +static int __init crc32_combine_test(void) +{ + int i, j; + int errors = 0, runs = 0; + + for (i = 0; i < 100; 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++; + } + } + + 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; } -- 2.20.1