mlxsw: spectrum: Use PLLP to get front panel number and split number

Instead of relying on the values coming from the PMLP register, use PLLP
to get the information about port front panel number and split number.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -1441,6 +1441,23 @@ mlxsw_sp_port_vlan_classification_set(struct mlxsw_sp_port *mlxsw_sp_port,
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(spvc), spvc_pl);
 }
 
+static int mlxsw_sp_port_label_info_get(struct mlxsw_sp *mlxsw_sp,
+					u8 local_port, u8 *port_number,
+					u8 *split_port_subnumber,
+					u8 *slot_index)
+{
+	char pllp_pl[MLXSW_REG_PLLP_LEN];
+	int err;
+
+	mlxsw_reg_pllp_pack(pllp_pl, local_port);
+	err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(pllp), pllp_pl);
+	if (err)
+		return err;
+	mlxsw_reg_pllp_unpack(pllp_pl, port_number,
+			      split_port_subnumber, slot_index);
+	return 0;
+}
+
 static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 				u8 split_base_local_port,
 				struct mlxsw_sp_port_mapping *port_mapping)
@@ -1449,7 +1466,10 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 	bool split = !!split_base_local_port;
 	struct mlxsw_sp_port *mlxsw_sp_port;
 	u32 lanes = port_mapping->width;
+	u8 split_port_subnumber;
 	struct net_device *dev;
+	u8 port_number;
+	u8 slot_index;
 	bool splittable;
 	int err;
 
@@ -1467,12 +1487,18 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 		goto err_port_swid_set;
 	}
 
+	err = mlxsw_sp_port_label_info_get(mlxsw_sp, local_port, &port_number,
+					   &split_port_subnumber, &slot_index);
+	if (err) {
+		dev_err(mlxsw_sp->bus_info->dev, "Port %d: Failed to get port label information\n",
+			local_port);
+		goto err_port_label_info_get;
+	}
+
 	splittable = lanes > 1 && !split;
 	err = mlxsw_core_port_init(mlxsw_sp->core, local_port,
-				   port_mapping->module + 1, split,
-				   port_mapping->lane / lanes,
-				   splittable, lanes,
-				   mlxsw_sp->base_mac,
+				   port_number, split, split_port_subnumber,
+				   splittable, lanes, mlxsw_sp->base_mac,
 				   sizeof(mlxsw_sp->base_mac));
 	if (err) {
 		dev_err(mlxsw_sp->bus_info->dev, "Port %d: Failed to init core port\n",
@@ -1717,6 +1743,7 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 err_alloc_etherdev:
 	mlxsw_core_port_fini(mlxsw_sp->core, local_port);
 err_core_port_init:
+err_port_label_info_get:
 	mlxsw_sp_port_swid_set(mlxsw_sp, local_port,
 			       MLXSW_PORT_SWID_DISABLED_PORT);
 err_port_swid_set: