net: lan966x: Add support for TC flower filter statistics

Add flower filter packet statistics. This will just read the TCAM
counter of the rule, which mention how many packages were hit by this
rule.
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c

@@ -234,6 +234,24 @@ static int lan966x_tc_flower_del(struct lan966x_port *port,
 	return err;
 }
 
+static int lan966x_tc_flower_stats(struct lan966x_port *port,
+				   struct flow_cls_offload *f,
+				   struct vcap_admin *admin)
+{
+	struct vcap_counter count = {};
+	int err;
+
+	err = vcap_get_rule_count_by_cookie(port->lan966x->vcap_ctrl,
+					    &count, f->cookie);
+	if (err)
+		return err;
+
+	flow_stats_update(&f->stats, 0x0, count.value, 0, 0,
+			  FLOW_ACTION_HW_STATS_IMMEDIATE);
+
+	return err;
+}
+
 int lan966x_tc_flower(struct lan966x_port *port,
 		      struct flow_cls_offload *f,
 		      bool ingress)
@@ -252,6 +270,8 @@ int lan966x_tc_flower(struct lan966x_port *port,
 		return lan966x_tc_flower_add(port, f, admin, ingress);
 	case FLOW_CLS_DESTROY:
 		return lan966x_tc_flower_del(port, f, admin);
+	case FLOW_CLS_STATS:
+		return lan966x_tc_flower_stats(port, f, admin);
 	default:
 		return -EOPNOTSUPP;
 	}