mlxsw: spectrum: Keep maximum speed around

The maximum port speed depends on link modes supported by the port, and for
Ethernet ports is constant. The maximum speed will be handy when setting
SBIB, the internal buffer used for traffic mirroring. Therefore, keep it in
struct mlxsw_sp_port for easy access.
Signed-off-by: Petr Machata <petrm@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

@@ -1849,6 +1849,14 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 		goto err_port_speed_by_width_set;
 	}
 
+	err = mlxsw_sp->port_type_speed_ops->ptys_max_speed(mlxsw_sp_port,
+							    &mlxsw_sp_port->max_speed);
+	if (err) {
+		dev_err(mlxsw_sp->bus_info->dev, "Port %d: Failed to get maximum speed\n",
+			mlxsw_sp_port->local_port);
+		goto err_max_speed_get;
+	}
+
 	err = mlxsw_sp_port_max_mtu_get(mlxsw_sp_port, &mlxsw_sp_port->max_mtu);
 	if (err) {
 		dev_err(mlxsw_sp->bus_info->dev, "Port %d: Failed to get maximum MTU\n",
@@ -1981,6 +1989,7 @@ static int mlxsw_sp_port_create(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 err_port_admin_status_set:
 err_port_mtu_set:
 err_port_max_mtu_get:
+err_max_speed_get:
 err_port_speed_by_width_set:
 err_port_system_port_mapping_set:
 err_dev_addr_init:

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

@@ -320,6 +320,7 @@ struct mlxsw_sp_port {
 		struct delayed_work speed_update_dw;
 	} span;
 	int max_mtu;
+	u32 max_speed;
 };
 
 struct mlxsw_sp_port_type_speed_ops {