app/test: add crc32 algorithms equivalence check

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@sts.kz>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

diff --git a/app/test/test_hash.c b/app/test/test_hash.c
index 76b1b8f..653dd86 100644 (file)
--- a/app/test/test_hash.c
+++ b/app/test/test_hash.c
@@ -177,6 +177,63 @@ 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, %lu 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;
+}
+
 /*
  * Test a hash function.
  */
@@ -1356,6 +1413,9 @@ test_hash(void)
 
        run_hash_func_tests();
 
+       if (test_crc32_hash_alg_equiv() < 0)
+               return -1;
+
        return 0;
 }