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Alongside the helper ip_link_set_up(), one to set the link down will be useful as well. Add a helper to determine the link state as well, ip_link_is_up(), and use it to short-circuit any changes if the state is already the desired one. Furthermore, add a helper bridge_vlan_add(). Signed-off-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Acked-by: Nikolay Aleksandrov <razor@blackwall.org> Link: https://patch.msgid.link/856d9e01725fdba21b7f6716358f645b19131af2.1734540770.git.petrm@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>