net/mlx5: DR, Allow insertion of duplicate rules

Duplicate rules were not allowed to be configured with SW steering.
This restriction caused failures with the replace rule logic done by
upper layers.

This fix allows for multiple rules with the same match values, in
such case the first inserted rules will match.

Fixes: 41d0707 ("net/mlx5: DR, Expose steering rule functionality")
Signed-off-by: Alex Vesker <[email protected]>
Signed-off-by: Tariq Toukan <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

Author: alexvesker

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c

@@ -788,12 +788,10 @@ dr_rule_handle_ste_branch(struct mlx5dr_rule *rule,
 			 * it means that all the previous stes are the same,
 			 * if so, this rule is duplicated.
 			 */
-			if (mlx5dr_ste_is_last_in_rule(nic_matcher,
-						       matched_ste->ste_chain_location)) {
-				mlx5dr_info(dmn, "Duplicate rule inserted, aborting!!\n");
-				return NULL;
-			}
-			return matched_ste;
+			if (!mlx5dr_ste_is_last_in_rule(nic_matcher, ste_location))
+				return matched_ste;
+
+			mlx5dr_dbg(dmn, "Duplicate rule inserted\n");
 		}
 
 		if (!skip_rehash && dr_rule_need_enlarge_hash(cur_htbl, dmn, nic_dmn)) {