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lib: crc32: add test cases for crc32{, c}_combine routines

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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 <dborkman@redhat.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-10-30 11:50:50 +01:00 committed by David S. Miller
parent 6e95fcaa42
commit efba721f63
1 changed files with 72 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

72
lib/crc32.c
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@ -1031,6 +1031,40 @@ static int __init crc32c_test(void)
return 0; 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) static int __init crc32_test(void)
{ {
int i; int i;
@ -1090,10 +1124,48 @@ static int __init crc32_test(void)
return 0; 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) static int __init crc32test_init(void)
{ {
crc32_test(); crc32_test();
crc32c_test(); crc32c_test();
crc32_combine_test();
crc32c_combine_test();
return 0; return 0;
} }