net/mlx5e: TC, Reject rules with multiple CT actions

The driver doesn't support multiple CT actions.
Multiple CT clear actions are ok as they are redundant also with
another CT actions.
Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h

@@ -16,6 +16,7 @@ struct mlx5e_tc_act_parse_state {
 	unsigned int num_actions;
 	struct mlx5e_tc_flow *flow;
 	struct netlink_ext_ack *extack;
+	bool ct;
 	bool encap;
 	bool decap;
 	bool mpls_push;

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/ct.c

@@ -11,6 +11,7 @@ tc_act_can_offload_ct(struct mlx5e_tc_act_parse_state *parse_state,
 		      int act_index,
 		      struct mlx5_flow_attr *attr)
 {
+	bool clear_action = act->ct.action & TCA_CT_ACT_CLEAR;
 	struct netlink_ext_ack *extack = parse_state->extack;
 
 	if (flow_flag_test(parse_state->flow, SAMPLE)) {
@@ -19,6 +20,11 @@ tc_act_can_offload_ct(struct mlx5e_tc_act_parse_state *parse_state,
 		return false;
 	}
 
+	if (parse_state->ct && !clear_action) {
+		NL_SET_ERR_MSG_MOD(extack, "Multiple CT actions are not supoported");
+		return false;
+	}
+
 	return true;
 }
 
@@ -28,6 +34,7 @@ tc_act_parse_ct(struct mlx5e_tc_act_parse_state *parse_state,
 		struct mlx5e_priv *priv,
 		struct mlx5_flow_attr *attr)
 {
+	bool clear_action = act->ct.action & TCA_CT_ACT_CLEAR;
 	int err;
 
 	err = mlx5_tc_ct_parse_action(parse_state->ct_priv, attr,
@@ -41,6 +48,9 @@ tc_act_parse_ct(struct mlx5e_tc_act_parse_state *parse_state,
 	if (mlx5e_is_eswitch_flow(parse_state->flow))
 		attr->esw_attr->split_count = attr->esw_attr->out_count;
 
+	if (!clear_action)
+		parse_state->ct = true;
+
 	return 0;
 }