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

[Yerden Zhumabekov]

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>
---
 app/test/test_hash.c |   53 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/app/test/test_hash.c b/app/test/test_hash.c
index 76b1b8f..941dc69 100644
--- a/app/test/test_hash.c
+++ b/app/test/test_hash.c
@@ -177,6 +177,56 @@ static struct rte_hash_parameters ut_params = {
 	.socket_id = 0,
 };
 
+#define CRC32_ITERATIONS (1U << 16)
+#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;
+	int res = 0;
+
+	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)) {
+			res = -1;
+			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)) {
+			res = -1;
+			break;
+		}
+	}
+
+	/* Resetting to best available algorithm */
+	rte_hash_crc_set_alg(CRC32_SSE42_x64);
+	return res;
+}
+
 /*
  * Test a hash function.
  */
@@ -1356,6 +1406,9 @@ test_hash(void)
 
 	run_hash_func_tests();
 
+	if (test_crc32_hash_alg_equiv() < 0)
+		return -1;
+
 	return 0;
 }
 
-- 
1.7.9.5