net: mscc: ocelot: move ocelot_port_private :: chip_port to ocelot_port :: index

Currently the ocelot switch lib is unaware of the index of a struct
ocelot_port, since that is kept in the encapsulating structures of outer
drivers (struct dsa_port :: index, struct ocelot_port_private :: chip_port).

With the upcoming increase in complexity associated with assigning DSA
tag_8021q CPU ports to certain user ports, it becomes necessary for the
switch lib to be able to retrieve the index of a certain ocelot_port.

Therefore, introduce a new u8 to ocelot_port (same size as the chip_port
used by the ocelot switchdev driver) and rework the existing code to
populate and use it.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/ocelot/felix.c

@@ -1249,6 +1249,7 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
 		ocelot_port->phy_mode = port_phy_modes[port];
 		ocelot_port->ocelot = ocelot;
 		ocelot_port->target = target;
+		ocelot_port->index = port;
 		ocelot->ports[port] = ocelot_port;
 	}
 

drivers/net/ethernet/mscc/ocelot.h

@@ -48,7 +48,6 @@ struct ocelot_port_private {
 	struct net_device *dev;
 	struct phylink *phylink;
 	struct phylink_config phylink_config;
-	u8 chip_port;
 	struct ocelot_port_tc tc;
 };
 

include/soc/mscc/ocelot.h

@@ -675,6 +675,8 @@ struct ocelot_port {
 	u8				ptp_cmd;
 	u8				ts_id;
 
+	u8				index;
+
 	u8				stp_state;
 	bool				vlan_aware;
 	bool				is_dsa_8021q_cpu;