Function test_crc32_hash_alg_equiv

dpdk/app/test/test_hash.c:165–222

* Test if all CRC32 implementations yield the same hash value */

 * 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("\n# 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;
		}

		/* Check against 8-byte-operand ARM64 CRC32 if available */
		rte_hash_crc_set_alg(CRC32_ARM64);
		if (hash_val != rte_hash_crc(data64, data_len, init_val)) {
			printf("Failed checking CRC32_SW against CRC32_ARM64\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, %zu bytes total):\n", data_len);
	for (j = 0; j < data_len; j++)
		printf("%02X%c", ((uint8_t *)data64)[j],
				((j+1) % 16 == 0 || j == data_len - 1) ? '\n' : ' ');

	return -1;
}