On Tue, Dec 10, 2024 at 03:12:42PM +0100, Daniel Borkmann wrote:
> If a bonding device has slave devices, then the current logic to derive
> the feature set for the master bond device is limited in that flags which
> are fully supported by the underlying slave devices cannot be propagated
> up to vlan devices which sit on top of bond devices. Instead, these get
> blindly masked out via current NETIF_F_ALL_FOR_ALL logic.
>
> vlan_features and mpls_features should reuse netdev_base_features() in
> order derive the set in the same way as ndo_fix_features before iterating
> through the slave devices to refine the feature set.
>
> Fixes: a9b3ace44c7d ("bonding: fix vlan_features computing")
> Fixes: 2e770b507ccd ("net: bonding: Inherit MPLS features from slave devices")
> Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> Cc: Nikolay Aleksandrov <razor@xxxxxxxxxxxxx>
> Cc: Ido Schimmel <idosch@xxxxxxxxxx>
> Cc: Jiri Pirko <jiri@xxxxxxxxxx>
> ---
> drivers/net/bonding/bond_main.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 42c835c60cd8..320dd71392ef 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -1563,8 +1563,9 @@ static void bond_compute_features(struct bonding *bond)
>
> if (!bond_has_slaves(bond))
> goto done;
> - vlan_features &= NETIF_F_ALL_FOR_ALL;
> - mpls_features &= NETIF_F_ALL_FOR_ALL;
> +
> + vlan_features = netdev_base_features(vlan_features);
> + mpls_features = netdev_base_features(mpls_features);
>
> bond_for_each_slave(bond, slave, iter) {
> vlan_features = netdev_increment_features(vlan_features,
> --
> 2.43.0
>
Reviewed-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
