[dpdk-dev] [PATCH v2] app/test: add crc32 algorithms equivalence check

[Yerden Zhumabekov]

All notes taken into account. v3 posted.

25.02.2015 17:34, Bruce Richardson пишет:
> On Wed, Feb 25, 2015 at 10:08:32AM +0600, Yerden Zhumabekov wrote:
>> New function test_crc32_hash_alg_equiv() checks whether software,
>> 4-byte operand and 8-byte operand versions of CRC32 hash function
>> implementations return the same result value.
>>
>> Signed-off-by: Yerden Zhumabekov <e_zhumabekov at sts.kz>
> Two small notes below for improving output on error.
>
> Acked-by: Bruce Richardson <bruce.richardson at intel.com>
>
>> ---
>>  app/test/test_hash.c |   63 ++++++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 63 insertions(+)
>>
>> diff --git a/app/test/test_hash.c b/app/test/test_hash.c
>> index 76b1b8f..3e94af1 100644
>> --- a/app/test/test_hash.c
>> +++ b/app/test/test_hash.c
>> @@ -177,6 +177,66 @@ static struct rte_hash_parameters ut_params = {
>>  	.socket_id = 0,
>>  };
>>  
>> +#define CRC32_ITERATIONS (1U << 20)
>> +#define CRC32_DWORDS (1U << 6)
>> +/*
>> + * Test if all CRC32 implementations yield the same hash value
>> + */
>> +static int
>> +test_crc32_hash_alg_equiv(void)
>> +{
>> +	uint32_t hash_val;
>> +	uint32_t init_val;
>> +	uint64_t data64[CRC32_DWORDS];
>> +	unsigned i, j;
>> +	size_t data_len;
>> +
>> +	printf("# CRC32 implementations equivalence test\n");
>> +	for (i = 0; i < CRC32_ITERATIONS; i++) {
>> +		/* Randomizing data_len of data set */
>> +		data_len = (size_t) ((rte_rand() % sizeof(data64)) + 1);
>> +		init_val = (uint32_t) rte_rand();
>> +
>> +		/* Fill the data set */
>> +		for (j = 0; j < CRC32_DWORDS; j++)
>> +			data64[j] = rte_rand();
>> +
>> +		/* Calculate software CRC32 */
>> +		rte_hash_crc_set_alg(CRC32_SW);
>> +		hash_val = rte_hash_crc(data64, data_len, init_val);
>> +
>> +		/* Check against 4-byte-operand sse4.2 CRC32 if available */
>> +		rte_hash_crc_set_alg(CRC32_SSE42);
>> +		if (hash_val != rte_hash_crc(data64, data_len, init_val)) {
>> +			printf("Failed checking CRC32_SW against CRC32_SSE42\n");
>> +			break;
>> +		}
>> +
>> +		/* Check against 8-byte-operand sse4.2 CRC32 if available */
>> +		rte_hash_crc_set_alg(CRC32_SSE42_x64);
>> +		if (hash_val != rte_hash_crc(data64, data_len, init_val)) {
>> +			printf("Failed checking CRC32_SW against CRC32_SSE42_x64\n");
>> +			break;
>> +		}
>> +	}
>> +
>> +	/* Resetting to best available algorithm */
>> +	rte_hash_crc_set_alg(CRC32_SSE42_x64);
>> +
>> +	if (i == CRC32_ITERATIONS)
>> +		return 0;
>> +
>> +	printf("Failed test data (hex):\n");
>> +
>> +	for (j = 0; j < data_len; j++) {
>> +		printf("%02X", ((uint8_t *)data64)[j]);
> Put in a space after each hex character, otherwise it comes out like:
>
> Failed test data (hex):
> AAD292776348010C7A18D3080DB3A300
> FD
> Test Failed
>
> [I forced a failure by changing a != to == to test it, don't worry, the
> hash calculations are fine! :-)]
>
>> +		if ((j+1) % 16 == 0 || j == data_len - 1)
>> +			printf("\n");
>> +	}
> Maybe also print out here, or before the hex digits, the length of the data
> that was tested. e.g. "printf("%u bytes total\n", data_len);" or similar.
>> +
>> +	return -1;
>> +}
>> +
>>  /*
>>   * Test a hash function.
>>   */
>> @@ -1356,6 +1416,9 @@ test_hash(void)
>>  
>>  	run_hash_func_tests();
>>  
>> +	if (test_crc32_hash_alg_equiv() < 0)
>> +		return -1;
>> +
>>  	return 0;
>>  }
>>  
>> -- 
>> 1.7.9.5
>>

-- 
Sincerely,

Yerden Zhumabekov
State Technical Service
Astana, KZ