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[OpenStack Infra <2074207@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/926497
Committed: https://opendev.org/openstack/neutron/commit/40657fab6302f4625e4c3d52481e1801080b649d
Submitter: "Zuul (22348)"
Branch:    master

commit 40657fab6302f4625e4c3d52481e1801080b649d
Author: Brian Haley <haleyb.dev@xxxxxxxxx>
Date:   Sat Aug 17 19:28:03 2024 -0400

    Optionally configure IPv6 metadata address
    
    If there is a network without an IPv6 subnet, the
    dhcp-agent does not need to configure an IPv6 metadata
    address. There is the possibility this could cause a
    failure if one of the IPv4 subnets has a small mtu (<1280).
    
    Re-arranged code slightly to only loop through the
    subnets a single time doing multiple checks at once.
    
    Similarly, the OVN metadata agent should only configure
    IPv6 addresses if there is an IPv6 subnet present, and
    remove any IPv6 addresses if they are removed. It should
    also only listen in the IPv6 metadata address if IPv6 is
    enabled, same as the dhcp-agent does.
    
    Had to change a number of OVN metadata tests to account
    for cases where IPv6 is/is not enabled and IPv6 subnets
    are/are not present.
    
    Closes-bug: #2074207
    Change-Id: Ib332c357bc1c330cd7c2645b9fbbf5bdbdeb899f


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2074207

Title:
  DHCP agent makes endless attempts to configure a network with MTU <
  1280

Status in neutron:
  Fix Released

Bug description:
  I get endless attempts to configure the network in the neutron-dhcp-
  agent logs.

  Conditions
  - devstack setup with extra `force_metadata = true` config option.
  - DHCP enabled vxlan network with MTU=1000

  $ openstack network create net1000 --mtu 1000
  $ openstack subnet create sub1 --network net1000 --dhcp --subnet-range 10.20.30.0/24

  
  Jul 26 09:38:35 devoct30 neutron-dhcp-agent[1690530]: INFO neutron.agent.dhcp.agent [None req-dfc13386-aaed-48e3-80b5-ebad6f324f3a None None] Synchronizing state
  Jul 26 09:38:35 devoct30 neutron-dhcp-agent[1690530]: INFO oslo_messaging._drivers.amqpdriver [None req-2caf8aeb-fbf0-457f-ac27-35d9aa75db90 None None] Expecting reply to msg 57ad6fa408c5444aa5b56be27020ccce in queue reply_081c0528a7b5431897eb5e8a5e4a7919
  Jul 26 09:38:35 devoct30 neutron-dhcp-agent[1690530]: INFO oslo_messaging._drivers.amqpdriver [-] Received RPC response for msg 57ad6fa408c5444aa5b56be27020ccce
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: INFO neutron.agent.dhcp.agent [None req-2caf8aeb-fbf0-457f-ac27-35d9aa75db90 None None] All active networks have been fetched through RPC.
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: INFO neutron.agent.dhcp.agent [-] Starting network e5e3d4ff-f552-4864-aafc-5ed022616467 dhcp configuration
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for e5e3d4ff-f552-4864-aafc-5ed022616467.: neutron.privileged.agent.linux.ip_lib.InvalidArgument: Invalid parameter/value used on interface tapb8ae86a5-ca, namespace qdhcp-e5e3d4ff-f552-4864-aafc-5ed022616467.
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 265, in _call_driver
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     rv = getattr(driver, action)(**action_kwargs)
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 331, in enable
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     common_utils.wait_until_true(self._enable, timeout=300)
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/common/utils.py", line 739, in wait_until_true
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     while not predicate():
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 343, in _enable
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     interface_name = self.device_manager.setup(
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 1890, in setup
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     self.driver.init_l3(interface_name, ip_cidrs,
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/interface.py", line 152, in init_l3
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     device.addr.add(ip_cidr)
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 560, in add
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     add_ip_address(cidr, self.name, self._parent.namespace, scope,
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 853, in add_ip_address
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     privileged.add_ip_address(
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/usr/local/lib/python3.9/site-packages/oslo_privsep/priv_context.py", line 271, in _wrap
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     return self.channel.remote_call(name, args, kwargs,
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent   File "/usr/local/lib/python3.9/site-packages/oslo_privsep/daemon.py", line 215, in remote_call
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent     raise exc_type(*result[2])
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent neutron.privileged.agent.linux.ip_lib.InvalidArgument: Invalid parameter/value used on interface tapb8ae86a5-ca, namespace qdhcp-e5e3d4ff-f552-4864-aafc-5ed022616467.
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: ERROR neutron.agent.dhcp.agent
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: INFO neutron.agent.dhcp.agent [-] Finished network e5e3d4ff-f552-4864-aafc-5ed022616467 dhcp configuration
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: INFO neutron.agent.dhcp.agent [None req-2caf8aeb-fbf0-457f-ac27-35d9aa75db90 None None] Synchronizing state complete
  Jul 26 09:38:36 devoct30 neutron-dhcp-agent[1690530]: INFO neutron.agent.dhcp.agent [None req-2caf8aeb-fbf0-457f-ac27-35d9aa75db90 None None] Synchronizing state

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