mlxsw: spectrum: Relax sanity checks during enslavement

[ Upstream commit 90045fc9c78855bdc625a0ab185d97b72a937613 ]

Since commit 25cc72a33835 ("mlxsw: spectrum: Forbid linking to devices that
have uppers") the driver forbids enslavement to netdevs that already
have uppers of their own, as this can result in various ordering
problems.

This requirement proved to be too strict for some users who need to be
able to enslave ports to a bridge that already has uppers. In this case,
we can allow the enslavement if the bridge is already known to us, as
any configuration performed on top of the bridge was already reflected
to the device.

Fixes: 25cc72a33835 ("mlxsw: spectrum: Forbid linking to devices that have uppers")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reported-by: Alexander Petrovskiy <alexpe@mellanox.com>
Tested-by: Alexander Petrovskiy <alexpe@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 3ead7439821c9e5082d1ff8399b42779b62d81a2..99bd6e88ebc7e261933c512a723bf9f7a6d3cecd 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -4235,7 +4235,10 @@ static int mlxsw_sp_netdevice_port_upper_event(struct net_device *lower_dev,
                        return -EINVAL;
                if (!info->linking)
                        break;
-               if (netdev_has_any_upper_dev(upper_dev))
+               if (netdev_has_any_upper_dev(upper_dev) &&
+                   (!netif_is_bridge_master(upper_dev) ||
+                    !mlxsw_sp_bridge_device_is_offloaded(mlxsw_sp,
+                                                         upper_dev)))
                        return -EINVAL;
                if (netif_is_lag_master(upper_dev) &&
                    !mlxsw_sp_master_lag_check(mlxsw_sp, upper_dev,
@@ -4347,6 +4350,7 @@ static int mlxsw_sp_netdevice_port_vlan_event(struct net_device *vlan_dev,
                                              u16 vid)
 {
        struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+       struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
        struct netdev_notifier_changeupper_info *info = ptr;
        struct net_device *upper_dev;
        int err = 0;
@@ -4358,7 +4362,10 @@ static int mlxsw_sp_netdevice_port_vlan_event(struct net_device *vlan_dev,
                        return -EINVAL;
                if (!info->linking)
                        break;
-               if (netdev_has_any_upper_dev(upper_dev))
+               if (netdev_has_any_upper_dev(upper_dev) &&
+                   (!netif_is_bridge_master(upper_dev) ||
+                    !mlxsw_sp_bridge_device_is_offloaded(mlxsw_sp,
+                                                         upper_dev)))
                        return -EINVAL;
                break;
        case NETDEV_CHANGEUPPER:

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index 84ce83acdc199bf4c311c325edc5f7ccba1af375..88892d47acaebf4df7a2b16c895ea604b8ef7ec3 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -326,6 +326,8 @@ int mlxsw_sp_port_bridge_join(struct mlxsw_sp_port *mlxsw_sp_port,
 void mlxsw_sp_port_bridge_leave(struct mlxsw_sp_port *mlxsw_sp_port,
                                struct net_device *brport_dev,
                                struct net_device *br_dev);
+bool mlxsw_sp_bridge_device_is_offloaded(const struct mlxsw_sp *mlxsw_sp,
+                                        const struct net_device *br_dev);
 
 /* spectrum.c */
 int mlxsw_sp_port_ets_set(struct mlxsw_sp_port *mlxsw_sp_port,

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index d39ffbfcc436fdb4343b391f2ac6bbdd48dd14af..f5863e5bec81314724703c59b37c756162264a2d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -134,6 +134,12 @@ mlxsw_sp_bridge_device_find(const struct mlxsw_sp_bridge *bridge,
        return NULL;
 }
 
+bool mlxsw_sp_bridge_device_is_offloaded(const struct mlxsw_sp *mlxsw_sp,
+                                        const struct net_device *br_dev)
+{
+       return !!mlxsw_sp_bridge_device_find(mlxsw_sp->bridge, br_dev);
+}
+
 static struct mlxsw_sp_bridge_device *
 mlxsw_sp_bridge_device_create(struct mlxsw_sp_bridge *bridge,
                              struct net_device *br_dev)