net: dsa: Pass ndo_setup_tc slave callback to drivers

DSA currently handles shared block filters (for the classifier-action
qdisc) in the core due to what I believe are simply pragmatic reasons -
hiding the complexity from drivers and offerring a simple API for port
mirroring.

Extend the dsa_slave_setup_tc function by passing all other qdisc
offloads to the driver layer, where the driver may choose what it
implements and how. DSA is simply a pass-through in this case.
Signed-off-by: NVladimir Oltean <olteanv@gmail.com>
Acked-by: NKurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NIlias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/dsa.h

@@ -515,6 +515,8 @@ struct dsa_switch_ops {
 				   bool ingress);
 	void	(*port_mirror_del)(struct dsa_switch *ds, int port,
 				   struct dsa_mall_mirror_tc_entry *mirror);
+	int	(*port_setup_tc)(struct dsa_switch *ds, int port,
+				 enum tc_setup_type type, void *type_data);
 
 	/*
 	 * Cross-chip operations

net/dsa/slave.c

@@ -1035,12 +1035,16 @@ static int dsa_slave_setup_tc_block(struct net_device *dev,
 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
 			      void *type_data)
 {
-	switch (type) {
-	case TC_SETUP_BLOCK:
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+	struct dsa_switch *ds = dp->ds;
+
+	if (type == TC_SETUP_BLOCK)
 		return dsa_slave_setup_tc_block(dev, type_data);
-	default:
+
+	if (!ds->ops->port_setup_tc)
 		return -EOPNOTSUPP;
-	}
+
+	return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
 }
 
 static void dsa_slave_get_stats64(struct net_device *dev,