mlxsw: spectrum_switchdev: Avoid returning errors in commit phase

Drivers are not supposed to return errors in switchdev commit phase if
they returned OK in prepare phase. Otherwise, a WARNING is emitted.
However, when the offloading of a VXLAN tunnel is triggered by the
addition of a VLAN on a local port, it is not possible to guarantee that
the commit phase will succeed without doing a lot of work.

In these cases, the artificial division between prepare and commit phase
does not make sense, so simply do the work in the prepare phase.

Fixes: d70e42b22dd4 ("mlxsw: spectrum: Enable VxLAN enslavement to VLAN-aware bridges")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index 1bd2c6e..e8ce230 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -1078,8 +1078,7 @@ static int
 mlxsw_sp_bridge_port_vlan_add(struct mlxsw_sp_port *mlxsw_sp_port,
                              struct mlxsw_sp_bridge_port *bridge_port,
                              u16 vid, bool is_untagged, bool is_pvid,
-                             struct netlink_ext_ack *extack,
-                             struct switchdev_trans *trans)
+                             struct netlink_ext_ack *extack)
 {
        u16 pvid = mlxsw_sp_port_pvid_determine(mlxsw_sp_port, vid, is_pvid);
        struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan;
@@ -1095,9 +1094,6 @@ mlxsw_sp_bridge_port_vlan_add(struct mlxsw_sp_port *mlxsw_sp_port,
            mlxsw_sp_port_vlan->bridge_port != bridge_port)
                return -EEXIST;
 
-       if (switchdev_trans_ph_prepare(trans))
-               return 0;
-
        if (!mlxsw_sp_port_vlan) {
                mlxsw_sp_port_vlan = mlxsw_sp_port_vlan_create(mlxsw_sp_port,
                                                               vid);
@@ -1188,6 +1184,9 @@ static int mlxsw_sp_port_vlans_add(struct mlxsw_sp_port *mlxsw_sp_port,
                return err;
        }
 
+       if (switchdev_trans_ph_commit(trans))
+               return 0;
+
        bridge_port = mlxsw_sp_bridge_port_find(mlxsw_sp->bridge, orig_dev);
        if (WARN_ON(!bridge_port))
                return -EINVAL;
@@ -1200,7 +1199,7 @@ static int mlxsw_sp_port_vlans_add(struct mlxsw_sp_port *mlxsw_sp_port,
 
                err = mlxsw_sp_bridge_port_vlan_add(mlxsw_sp_port, bridge_port,
                                                    vid, flag_untagged,
-                                                   flag_pvid, extack, trans);
+                                                   flag_pvid, extack);
                if (err)
                        return err;
        }
@@ -3207,7 +3206,6 @@ mlxsw_sp_switchdev_vxlan_vlan_add(struct mlxsw_sp *mlxsw_sp,
                                  struct mlxsw_sp_bridge_device *bridge_device,
                                  const struct net_device *vxlan_dev, u16 vid,
                                  bool flag_untagged, bool flag_pvid,
-                                 struct switchdev_trans *trans,
                                  struct netlink_ext_ack *extack)
 {
        struct vxlan_dev *vxlan = netdev_priv(vxlan_dev);
@@ -3225,9 +3223,6 @@ mlxsw_sp_switchdev_vxlan_vlan_add(struct mlxsw_sp *mlxsw_sp,
            mlxsw_sp_bridge_8021q_vxlan_dev_find(bridge_device->dev, vid))
                return -EINVAL;
 
-       if (switchdev_trans_ph_prepare(trans))
-               return 0;
-
        if (!netif_running(vxlan_dev))
                return 0;
 
@@ -3345,6 +3340,9 @@ mlxsw_sp_switchdev_vxlan_vlans_add(struct net_device *vxlan_dev,
 
        port_obj_info->handled = true;
 
+       if (switchdev_trans_ph_commit(trans))
+               return 0;
+
        bridge_device = mlxsw_sp_bridge_device_find(mlxsw_sp->bridge, br_dev);
        if (!bridge_device)
                return -EINVAL;
@@ -3358,8 +3356,7 @@ mlxsw_sp_switchdev_vxlan_vlans_add(struct net_device *vxlan_dev,
                err = mlxsw_sp_switchdev_vxlan_vlan_add(mlxsw_sp, bridge_device,
                                                        vxlan_dev, vid,
                                                        flag_untagged,
-                                                       flag_pvid, trans,
-                                                       extack);
+                                                       flag_pvid, extack);
                if (err)
                        return err;
        }