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Commit efba721f authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

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: default avatarDaniel Borkmann <dborkman@redhat.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6e95fcaa

lib/crc32.c

+72 −0
Original line number Diff line number Diff line
@@ -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;

}