net: mscc: ocelot: make the NPI port a proper target for FDB and MDB

When used in DSA mode (as seen in Felix), the DEST_IDX in the MAC table
should point to the PGID for the CPU port (PGID_CPU) and not for the
Ethernet port where the CPU queues are redirected to (also known as Node
Processor Interface - NPI).

Because for Felix this distinction shouldn't really matter (from DSA
perspective, the NPI port _is_ the CPU port), make the ocelot library
act upon the CPU port when NPI mode is enabled. This has no effect for
the mscc_ocelot driver for VSC7514, because that does not use NPI (and
ocelot->npi is -1).
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mscc/ocelot.c

@@ -535,6 +535,10 @@ int ocelot_fdb_add(struct ocelot *ocelot, int port,
 		   const unsigned char *addr, u16 vid)
 {
 	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	int pgid = port;
+
+	if (port == ocelot->npi)
+		pgid = PGID_CPU;
 
 	if (!vid) {
 		if (!ocelot_port->vlan_aware)
@@ -550,7 +554,7 @@ int ocelot_fdb_add(struct ocelot *ocelot, int port,
 			return -EINVAL;
 	}
 
-	return ocelot_mact_learn(ocelot, port, addr, vid, ENTRYTYPE_LOCKED);
+	return ocelot_mact_learn(ocelot, pgid, addr, vid, ENTRYTYPE_LOCKED);
 }
 EXPORT_SYMBOL(ocelot_fdb_add);
 
@@ -953,6 +957,9 @@ int ocelot_port_obj_add_mdb(struct net_device *dev,
 	u16 vid = mdb->vid;
 	bool new = false;
 
+	if (port == ocelot->npi)
+		port = ocelot->num_phys_ports;
+
 	if (!vid)
 		vid = ocelot_port->pvid;
 
@@ -997,6 +1004,9 @@ int ocelot_port_obj_del_mdb(struct net_device *dev,
 	int port = priv->chip_port;
 	u16 vid = mdb->vid;
 
+	if (port == ocelot->npi)
+		port = ocelot->num_phys_ports;
+
 	if (!vid)
 		vid = ocelot_port->pvid;