Function rte_lpm6_delete

dpdk/lib/lpm/rte_lpm6.c:1288–1382

* Deletes a rule */

 * Deletes a rule
 */
int
rte_lpm6_delete(struct rte_lpm6 *lpm, const uint8_t *ip, uint8_t depth)
{
	uint8_t masked_ip[RTE_LPM6_IPV6_ADDR_SIZE];
	struct rte_lpm6_rule lsp_rule_obj;
	struct rte_lpm6_rule *lsp_rule;
	int ret;
	uint32_t tbl_ind;
	struct rte_lpm6_tbl_entry *from, *to;

	/* Check input arguments. */
	if ((lpm == NULL) || (depth < 1) || (depth > RTE_LPM6_MAX_DEPTH))
		return -EINVAL;

	/* Copy the IP and mask it to avoid modifying user's input data. */
	ip6_copy_addr(masked_ip, ip);
	ip6_mask_addr(masked_ip, depth);

	/* Delete the rule from the rule table. */
	ret = rule_delete(lpm, masked_ip, depth);
	if (ret < 0)
		return -ENOENT;

	/* find rule cells */
	rule_find_range(lpm, masked_ip, depth, &from, &to, &tbl_ind);

	/* find a less specific rule (a rule with smaller depth)
	 * note: masked_ip will be modified, don't use it anymore
	 */
	ret = rule_find_less_specific(lpm, masked_ip, depth,
			&lsp_rule_obj);
	lsp_rule = ret ? &lsp_rule_obj : NULL;

	/* decrement the table rule counter,
	 * note that tbl24 doesn't have a header
	 */
	if (tbl_ind != TBL24_IND) {
		struct rte_lpm_tbl8_hdr *tbl_hdr = &lpm->tbl8_hdrs[tbl_ind];
		if (--tbl_hdr->ref_cnt == 0) {
			/* remove the table */
			remove_tbl(lpm, tbl_hdr, tbl_ind, lsp_rule);
			return 0;
		}
	}

	/* iterate rule cells */
	for (; from <= to; from++)
		if (from->ext_entry == 1) {
			/* reference to a more specific space
			 * of the prefix/rule. Entries in a more
			 * specific space that are not used by
			 * a more specific prefix must be occupied
			 * by the prefix
			 */
			if (lsp_rule != NULL)
				expand_rule(lpm,
					from->lpm6_tbl8_gindex *
					RTE_LPM6_TBL8_GROUP_NUM_ENTRIES,