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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1495161

Title:
  Cannot add tap interface to the bridge when bridge mappings is not
  provided (Linux bridge)

Status in neutron:
  Fix Released

Bug description:
  I am using linux bridge and I cannot add dhcp tap interface when the
  bridge mappings is not provided.

  Steps to reproduce:

  1. Create a network
  2. Create a subnet under that network
  3. Observe that the dhcp port is DOWN

  From the linux bridge log:

  2015-09-12 18:25:28.857 ERROR neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent [req-9cf39db9-
  5071-4b9a-bcb6-908f759de0f4 None None] Error in agent loop. Devices info: {'current': set(['tap895fe52f-0d', 'tapb2d
  9e954-de', 'tap20a094ab-24', 'tap8aebc9c0-89', 'tap108580e4-6f', 'tapd4feefc5-f4']), 'removed': set([]), 'added': se
  t(['tap895fe52f-0d', 'tapb2d9e954-de', 'tap20a094ab-24', 'tap8aebc9c0-89', 'tap108580e4-6f', 'tapd4feefc5-f4']), 'up
  dated': set([])}
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent Traceback (mos
  t recent call last):
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 1110, in daemon_loop
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     sync = sel
  f.process_network_devices(device_info)
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 959, in process_netwo
  rk_devices
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     resync_a =
   self.treat_devices_added_updated(devices_added_updated)
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 998, in treat_devices
  _added_updated
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     device_det
  ails['port_id']):
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 501, in add_interface
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     tap_device
  _name)
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 479, in add_tap_inter
  face
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     if bridge_
  lib.BridgeDevice(bridge_name).addif(tap_device_name):
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/agent/linux/bridge_lib.py", line 38, in addif
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     return sel
  f._brctl(['addif', self.name, interface])
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/agent/linux/bridge_lib.py", line 26, in _brctl
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     return ip_
  wrapper.netns.execute(cmd, run_as_root=True)
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/agent/linux/ip_lib.py", line 795, in execute
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     extra_ok_c
  odes=extra_ok_codes, **kwargs)
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent   File "/opt/s
  tack/neutron/neutron/agent/linux/utils.py", line 160, in execute
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent     raise Runt
  imeError(m)
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent RuntimeError: 
  2015-09-12 18:25:28.857 TRACE neutron.plugins.ml2.drivers.linuxbridge.agent.linuxbridge_neutron_agent Command: ['brc
  tl', 'addif', None, u'tapb2d9e954-de']

  From the code, looks like we need to provide bridge mapping when the
  interface mapping is provided:

  https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py#L456-L459

  But this is not the case as it works in Kilo as bridge mapping option
  doesn't exist until Liberty.

  Neutron version : Liberty

  Attached local.conf here

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