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phys_port_id_show, phys_port_name_show and phys_switch_id_show would return -EOPNOTSUPP if the netdev didn't implement the corresponding method. There is no point in creating these files if they are unsupported. Put these attributes in netdev_phys_group and implement the is_visible method. make phys_(port_id, port_name, switch_id) invisible if the netdev dosen't implement the corresponding method. Signed-off-by: Yajun Deng <yajun.deng@linux.dev> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20250612142707.4644-1-yajun.deng@linux.dev Signed-off-by: Jakub Kicinski <kuba@kernel.org>