[ovs-git] [openvswitch/ovs] 208ff1: bridge: Clean leaking netdevs when route is added.

GitHub noreply at github.com
Tue Jul 10 21:17:06 UTC 2018

  Branch: refs/heads/master
  Home:   https://github.com/openvswitch/ovs
  Commit: 208ff139395aa80c00e58e3d9c5a0e03faf1bdd5
  Author: Tiago Lam <tiago.lam at intel.com>
  Date:   2018-07-10 (Tue, 10 Jul 2018)

  Changed paths:
    M tests/system-interface.at
    M vswitchd/bridge.c

  Log Message:
  bridge: Clean leaking netdevs when route is added.

When adding a route to a bridge, by executing "$appctl ovs/route/add
$IP/$MASK $BR", a reference to the existing netdev is taken and stored
in an instantiated ip_dev struct which is then stored in an addr_list
list in tnl-ports.c. When OvS is signaled to exit, as a result of a
"$appctl $OVS_PID exit --cleanup", for example, the bridge takes care of
destroying its allocated port and iface structs. While destroying and
freeing an iface, the netdev associated with it is also destroyed.
However, for this to happen its ref_cnt must be 0.  Otherwise the
destructor of the netdev (specific to each datapath) won't be called. On
the userspace datapath this means a system interface, such as "br0",
wouldn't get deleted upon exit of OvS (when a route happens to be

This was first observed in the "ptap - triangle bridge setup with L2 and
L3 GRE tunnels" test, which runs as part of the system userspace
testsuite and uses the netdev datapath (as opoosed to several tests
which use the dummy datapath, where this issue isn't seen). The test
would pass every other time and fail the rest of the times because the
needed system interfaces (br-p1, br-p2 and br-p3) were already present
(from the previous successfull run which didn't clean up properly),
leading to a failure.

To fix the leak and clean up the interfaces upon exit, on its final
stage before destroying a netdev, in iface_destroy__(), the bridge calls
tnl_port_map_delete_ipdev() which takes care of freeing the instatiated
ip_dev structs that refer to a specific netdev.

An extra test is also introduced which verifies that the resources used
by OvS netdev datapath have been correctly cleaned up between

Signed-off-by: Tiago Lam <tiago.lam at intel.com>
Signed-off-by: Ben Pfaff <blp at ovn.org>

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