Function rte_lpm_delete

dpdk/lib/lpm/rte_lpm.c:1142–1195

* Deletes a rule */

 * Deletes a rule
 */
int
rte_lpm_delete(struct rte_lpm *lpm, uint32_t ip, uint8_t depth)
{
	int32_t rule_to_delete_index, sub_rule_index;
	struct __rte_lpm *i_lpm;
	uint32_t ip_masked;
	uint8_t sub_rule_depth;
	/*
	 * Check input arguments. Note: IP must be a positive integer of 32
	 * bits in length therefore it need not be checked.
	 */
	if ((lpm == NULL) || (depth < 1) || (depth > RTE_LPM_MAX_DEPTH)) {
		return -EINVAL;
	}

	i_lpm = container_of(lpm, struct __rte_lpm, lpm);
	ip_masked = ip & depth_to_mask(depth);

	/*
	 * Find the index of the input rule, that needs to be deleted, in the
	 * rule table.
	 */
	rule_to_delete_index = rule_find(i_lpm, ip_masked, depth);

	/*
	 * Check if rule_to_delete_index was found. If no rule was found the
	 * function rule_find returns -EINVAL.
	 */
	if (rule_to_delete_index < 0)
		return -EINVAL;

	/* Delete the rule from the rule table. */
	rule_delete(i_lpm, rule_to_delete_index, depth);

	/*
	 * Find rule to replace the rule_to_delete. If there is no rule to
	 * replace the rule_to_delete we return -1 and invalidate the table
	 * entries associated with this rule.
	 */
	sub_rule_depth = 0;
	sub_rule_index = find_previous_rule(i_lpm, ip, depth, &sub_rule_depth);

	/*
	 * If the input depth value is less than 25 use function
	 * delete_depth_small otherwise use delete_depth_big.
	 */
	if (depth <= MAX_DEPTH_TBL24) {
		return delete_depth_small(i_lpm, ip_masked, depth,
				sub_rule_index, sub_rule_depth);
	} else { /* If depth > MAX_DEPTH_TBL24 */
		return delete_depth_big(i_lpm, ip_masked, depth, sub_rule_index,
				sub_rule_depth);
	}
}

/*
 * Delete all rules from the LPM table.