Function test_add_delete_free_lf

dpdk/app/test/test_hash.c:501–581

* Sequence of operations for a single key with 'rw concurrency lock free' set: * - add * - delete: hit * - free: hit * Repeat the test case when 'multi writer add' is enabled. * - add * - delete: hit * - free: hit */

 *	- free: hit
 */
static int test_add_delete_free_lf(void)
{
/* Should match the #define LCORE_CACHE_SIZE value in rte_cuckoo_hash.h */
#define LCORE_CACHE_SIZE	64
	struct rte_hash *handle;
	hash_sig_t hash_value;
	int pos, expectedPos, delPos;
	uint8_t extra_flag;
	uint32_t i, ip_src;

	extra_flag = ut_params.extra_flag;
	ut_params.extra_flag = RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF;
	handle = rte_hash_create(&ut_params);
	RETURN_IF_ERROR(handle == NULL, "hash creation failed");
	ut_params.extra_flag = extra_flag;

	/*
	 * The number of iterations is at least the same as the number of slots
	 * rte_hash allocates internally. This is to reveal potential issues of
	 * not freeing keys successfully.
	 */
	for (i = 0; i < ut_params.entries + 1; i++) {
		hash_value = rte_hash_hash(handle, &keys[0]);
		pos = rte_hash_add_key_with_hash(handle, &keys[0], hash_value);
		print_key_info("Add", &keys[0], pos);
		RETURN_IF_ERROR(pos < 0, "failed to add key (pos=%d)", pos);
		expectedPos = pos;

		pos = rte_hash_del_key_with_hash(handle, &keys[0], hash_value);
		print_key_info("Del", &keys[0], pos);
		RETURN_IF_ERROR(pos != expectedPos,
				"failed to delete key (pos=%d)", pos);
		delPos = pos;

		pos = rte_hash_free_key_with_position(handle, delPos);
		print_key_info("Free", &keys[0], delPos);
		RETURN_IF_ERROR(pos != 0,
				"failed to free key (pos=%d)", delPos);
	}

	rte_hash_free(handle);

	extra_flag = ut_params.extra_flag;
	ut_params.extra_flag = RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF |
				RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD;
	handle = rte_hash_create(&ut_params);
	RETURN_IF_ERROR(handle == NULL, "hash creation failed");
	ut_params.extra_flag = extra_flag;

	ip_src = keys[0].ip_src;
	/*
	 * The number of iterations is at least the same as the number of slots
	 * rte_hash allocates internally. This is to reveal potential issues of
	 * not freeing keys successfully.
	 */
	for (i = 0; i < ut_params.entries + (RTE_MAX_LCORE - 1) *
					(LCORE_CACHE_SIZE - 1) + 1; i++) {
		keys[0].ip_src++;