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[Bug 1785227] [NEW] Router port: no dataplane update on change

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Public bug reported:

Hi colleagues,

I'm using Heat to provision Neutron and faced the bug which is rather
Neutron's than Heat's, since Neutron receives all information,
provisions control plane ('openstack port/router show' gives updated
config), but do nothing in dataplane.

My config, which I'm sending to Heat in order to change existing stack - https://pastebin.com/7J6emmSt
Changes are: qnet2-gwport's ip_address changed from 1.1.1.1 to 1.1.1.2
Information about environment is below.

After I apply changes, I see everything is updated to 1.1.1.2 in
'openstack show' outputs:

$ openstack port show cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d
[ ... ]
| fixed_ips             | ip_address='1.1.1.2', subnet_id='95f6bce5-cb46-43f6-86b5-16a71306e54e'
| id                    | cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d
| device_id             | 771bbc70-a4e9-4f42-9c51-71ba3e6b525f

$ openstack router show 771bbc70-a4e9-4f42-9c51-71ba3e6b525f
[ ... ]
| id                      | 771bbc70-a4e9-4f42-9c51-71ba3e6b525f
| interfaces_info         | [{"subnet_id": "95f6bce5-cb46-43f6-86b5-16a71306e54e", "ip_address": "1.1.1.2", "port_id": "cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d"}]

but actual ip address in netns is old:

# ip netns exec qrouter-771bbc70-a4e9-4f42-9c51-71ba3e6b525f ip a
[ ... ]
265: qr-cbb4bb4b-7c: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default qlen 1000
    link/ether d0:1c:a0:97:50:fb brd ff:ff:ff:ff:ff:ff
    inet 1.1.1.1/24 brd 1.1.1.255 scope global qr-cbb4bb4b-7c

Logs with debug are available here - https://pastebin.com/Aj8WrGUt .
There you will find that neutron-openvswitch-agent see changes to port:

===
Resource Port cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d updated (revision_number 26->29).

Old fields: {'fixed_ips': [IPAllocation(ip_address=1.1.1.1,network_id
=d608a42b-984c-46c8-9537-8249aee4ce29,port_id=cbb4bb4b-7ce4-4e58-b81e-
fc6262d8c53d,subnet_id=95f6bce5-cb46-43f6-86b5-16a71306e54e)],
'binding_levels':
[PortBindingLevel(driver='openvswitch',host='compute1',level=0,port_id
=cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d,segment=NetworkSegment(a72cc202
-b6ec-49ed-8e42-6f7875a9131b))]}

New fields: {'fixed_ips': [IPAllocation(ip_address=1.1.1.2,network_id=d608a42b-984c-46c8-9537-8249aee4ce29,port_id=cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d,subnet_id=95f6bce5-cb46-43f6-86b5-16a71306e54e)], 'binding_levels': [PortBindingLevel(driver='openvswitch',host='compute1',level=0,port_id=cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d,segment=NetworkSegment(a72cc202-b6ec-49ed-8e42-6f7875a9131b))]}
===

but later reports "Transaction caused no change do_commit" for all
commands ("Running txn command") that openvswitch-agent runs.

ENVIRONMENT:

OS: Ubuntu 16.04.5 LTS (Xenial Xerus)
Kernel: 4.15.0-24-generic #26~16.04.1-Ubuntu SMP
Neutron: 2:12.0.3-0ubuntu1~cloud0 (Queens)
Openvswitch: 2.9.0-0ubuntu1~cloud0
Patches for bug 1776468 (https://bugs.launchpad.net/neutron/+bug/1776468/) are applied.

Any help on this issue is highly appreciated. Any additional information
is available upon request.

Thank you!

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: neutron neutron-openvswitch-agent

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https://bugs.launchpad.net/bugs/1785227

Title:
  Router port: no dataplane update on change

Status in neutron:
  New

Bug description:
  Hi colleagues,

  I'm using Heat to provision Neutron and faced the bug which is rather
  Neutron's than Heat's, since Neutron receives all information,
  provisions control plane ('openstack port/router show' gives updated
  config), but do nothing in dataplane.

  My config, which I'm sending to Heat in order to change existing stack - https://pastebin.com/7J6emmSt
  Changes are: qnet2-gwport's ip_address changed from 1.1.1.1 to 1.1.1.2
  Information about environment is below.

  After I apply changes, I see everything is updated to 1.1.1.2 in
  'openstack show' outputs:

  $ openstack port show cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d
  [ ... ]
  | fixed_ips             | ip_address='1.1.1.2', subnet_id='95f6bce5-cb46-43f6-86b5-16a71306e54e'
  | id                    | cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d
  | device_id             | 771bbc70-a4e9-4f42-9c51-71ba3e6b525f

  $ openstack router show 771bbc70-a4e9-4f42-9c51-71ba3e6b525f
  [ ... ]
  | id                      | 771bbc70-a4e9-4f42-9c51-71ba3e6b525f
  | interfaces_info         | [{"subnet_id": "95f6bce5-cb46-43f6-86b5-16a71306e54e", "ip_address": "1.1.1.2", "port_id": "cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d"}]

  but actual ip address in netns is old:

  # ip netns exec qrouter-771bbc70-a4e9-4f42-9c51-71ba3e6b525f ip a
  [ ... ]
  265: qr-cbb4bb4b-7c: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default qlen 1000
      link/ether d0:1c:a0:97:50:fb brd ff:ff:ff:ff:ff:ff
      inet 1.1.1.1/24 brd 1.1.1.255 scope global qr-cbb4bb4b-7c

  Logs with debug are available here - https://pastebin.com/Aj8WrGUt .
  There you will find that neutron-openvswitch-agent see changes to
  port:

  ===
  Resource Port cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d updated (revision_number 26->29).

  Old fields: {'fixed_ips': [IPAllocation(ip_address=1.1.1.1,network_id
  =d608a42b-984c-46c8-9537-8249aee4ce29,port_id=cbb4bb4b-7ce4-4e58-b81e-
  fc6262d8c53d,subnet_id=95f6bce5-cb46-43f6-86b5-16a71306e54e)],
  'binding_levels':
  [PortBindingLevel(driver='openvswitch',host='compute1',level=0,port_id
  =cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d,segment=NetworkSegment(a72cc202
  -b6ec-49ed-8e42-6f7875a9131b))]}

  New fields: {'fixed_ips': [IPAllocation(ip_address=1.1.1.2,network_id=d608a42b-984c-46c8-9537-8249aee4ce29,port_id=cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d,subnet_id=95f6bce5-cb46-43f6-86b5-16a71306e54e)], 'binding_levels': [PortBindingLevel(driver='openvswitch',host='compute1',level=0,port_id=cbb4bb4b-7ce4-4e58-b81e-fc6262d8c53d,segment=NetworkSegment(a72cc202-b6ec-49ed-8e42-6f7875a9131b))]}
  ===

  but later reports "Transaction caused no change do_commit" for all
  commands ("Running txn command") that openvswitch-agent runs.

  ENVIRONMENT:

  OS: Ubuntu 16.04.5 LTS (Xenial Xerus)
  Kernel: 4.15.0-24-generic #26~16.04.1-Ubuntu SMP
  Neutron: 2:12.0.3-0ubuntu1~cloud0 (Queens)
  Openvswitch: 2.9.0-0ubuntu1~cloud0
  Patches for bug 1776468 (https://bugs.launchpad.net/neutron/+bug/1776468/) are applied.

  Any help on this issue is highly appreciated. Any additional
  information is available upon request.

  Thank you!

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