[PATCH net 2/5] bonding: Fix initial {vlan,mpls}_feature set in bond_compute_features

[Daniel Borkmann <daniel@iogearbox.net>]

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@iogearbox.net>
Cc: Nikolay Aleksandrov <razor@blackwall.org>
Cc: Ido Schimmel <idosch@idosch.org>
Cc: Jiri Pirko <jiri@nvidia.com>
---
 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