mlxsw: spectrum_switchdev: Do not leak RIFs when removing bridge

When a bridge device is removed, the VLANs are flushed from each
configured port. This causes the ports to decrement the reference count
on the associated FIDs (filtering identifier). If the reference count of
a FID is 1 and it has a RIF (router interface), then this RIF is
destroyed.

However, if no port is member in the VLAN for which a RIF exists, then
the RIF will continue to exist after the removal of the bridge. To
reproduce:

# ip link add name br0 type bridge vlan_filtering 1
# ip link set dev swp1 master br0
# ip link add link br0 name br0.10 type vlan id 10
# ip address add 192.0.2.0/24 dev br0.10
# ip link del dev br0

The RIF associated with br0.10 continues to exist.

Fix this by iterating over all the bridge device uppers when it is
destroyed and take care of destroying their RIFs.

Fixes: 99f44bb3527b ("mlxsw: spectrum: Enable L3 interfaces on top of bridge devices")
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.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index 3ae9301967410bca24e601e888b8b270b25c8e82..3cdb7aca90b72492f02fd4bce2c35ad6de76eaa9 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -414,6 +414,8 @@ mlxsw_sp_netdevice_ipip_ul_event(struct mlxsw_sp *mlxsw_sp,
 void
 mlxsw_sp_port_vlan_router_leave(struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan);
 void mlxsw_sp_rif_destroy(struct mlxsw_sp_rif *rif);
+void mlxsw_sp_rif_destroy_by_dev(struct mlxsw_sp *mlxsw_sp,
+                                struct net_device *dev);
 
 /* spectrum_kvdl.c */
 enum mlxsw_sp_kvdl_entry_type {

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 3a96307f51b055e4bcf0693704118fd9d4e90995..2ab9cf25a08ae19788d28ffddaa8698ba2213152 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -6234,6 +6234,17 @@ void mlxsw_sp_rif_destroy(struct mlxsw_sp_rif *rif)
        mlxsw_sp_vr_put(mlxsw_sp, vr);
 }
 
+void mlxsw_sp_rif_destroy_by_dev(struct mlxsw_sp *mlxsw_sp,
+                                struct net_device *dev)
+{
+       struct mlxsw_sp_rif *rif;
+
+       rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, dev);
+       if (!rif)
+               return;
+       mlxsw_sp_rif_destroy(rif);
+}
+
 static void
 mlxsw_sp_rif_subport_params_init(struct mlxsw_sp_rif_params *params,
                                 struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index 0d8444aaba01ae7e5eddc58ef7dbc87ee5d1cb7b..db715da7bab7746c58ed23b48048d8a4917ca10d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -127,6 +127,24 @@ bool mlxsw_sp_bridge_device_is_offloaded(const struct mlxsw_sp *mlxsw_sp,
        return !!mlxsw_sp_bridge_device_find(mlxsw_sp->bridge, br_dev);
 }
 
+static int mlxsw_sp_bridge_device_upper_rif_destroy(struct net_device *dev,
+                                                   void *data)
+{
+       struct mlxsw_sp *mlxsw_sp = data;
+
+       mlxsw_sp_rif_destroy_by_dev(mlxsw_sp, dev);
+       return 0;
+}
+
+static void mlxsw_sp_bridge_device_rifs_destroy(struct mlxsw_sp *mlxsw_sp,
+                                               struct net_device *dev)
+{
+       mlxsw_sp_rif_destroy_by_dev(mlxsw_sp, dev);
+       netdev_walk_all_upper_dev_rcu(dev,
+                                     mlxsw_sp_bridge_device_upper_rif_destroy,
+                                     mlxsw_sp);
+}
+
 static struct mlxsw_sp_bridge_device *
 mlxsw_sp_bridge_device_create(struct mlxsw_sp_bridge *bridge,
                              struct net_device *br_dev)
@@ -165,6 +183,8 @@ static void
 mlxsw_sp_bridge_device_destroy(struct mlxsw_sp_bridge *bridge,
                               struct mlxsw_sp_bridge_device *bridge_device)
 {
+       mlxsw_sp_bridge_device_rifs_destroy(bridge->mlxsw_sp,
+                                           bridge_device->dev);
        list_del(&bridge_device->list);
        if (bridge_device->vlan_enabled)
                bridge->vlan_enabled_exists = false;