Function rte_fbk_hash_create

dpdk/lib/hash/rte_fbk_hash.c:72–166

* Create a new hash table for use with four byte keys. * * @param params * Parameters used in creation of hash table. * * @return * Pointer to hash table structure that is used in future hash table * operations, or NULL on error. */

 *   operations, or NULL on error.
 */
struct rte_fbk_hash_table *
rte_fbk_hash_create(const struct rte_fbk_hash_params *params)
{
	struct rte_fbk_hash_table *ht = NULL;
	struct rte_tailq_entry *te;
	char hash_name[RTE_FBK_HASH_NAMESIZE];
	const uint32_t mem_size =
			sizeof(*ht) + (sizeof(ht->t[0]) * params->entries);
	uint32_t i;
	struct rte_fbk_hash_list *fbk_hash_list;
	rte_fbk_hash_fn default_hash_func = (rte_fbk_hash_fn)rte_jhash_1word;

	fbk_hash_list = RTE_TAILQ_CAST(rte_fbk_hash_tailq.head,
				       rte_fbk_hash_list);

	/* Error checking of parameters. */
	if ((!rte_is_power_of_2(params->entries)) ||
			(!rte_is_power_of_2(params->entries_per_bucket)) ||
			(params->entries == 0) ||
			(params->entries_per_bucket == 0) ||
			(params->entries_per_bucket > params->entries) ||
			(params->entries > RTE_FBK_HASH_ENTRIES_MAX) ||
			(params->entries_per_bucket > RTE_FBK_HASH_ENTRIES_PER_BUCKET_MAX)){
		rte_errno = EINVAL;
		return NULL;
	}

	snprintf(hash_name, sizeof(hash_name), "FBK_%s", params->name);

	rte_mcfg_tailq_write_lock();

	/* guarantee there's no existing */
	TAILQ_FOREACH(te, fbk_hash_list, next) {
		ht = (struct rte_fbk_hash_table *) te->data;
		if (strncmp(params->name, ht->name, RTE_FBK_HASH_NAMESIZE) == 0)
			break;
	}
	ht = NULL;
	if (te != NULL) {
		rte_errno = EEXIST;
		goto exit;
	}

	te = rte_zmalloc("FBK_HASH_TAILQ_ENTRY", sizeof(*te), 0);
	if (te == NULL) {
		RTE_LOG(ERR, HASH, "Failed to allocate tailq entry\n");
		goto exit;
	}

	/* Allocate memory for table. */
	ht = rte_zmalloc_socket(hash_name, mem_size,
			0, params->socket_id);
	if (ht == NULL) {
		RTE_LOG(ERR, HASH, "Failed to allocate fbk hash table\n");
		rte_free(te);
		goto exit;
	}