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[Bug 1969615] Re: OVS: flow loop is created with openvswitch version 2.16

 

So flows look the same for both 2.15 and 2.16 (no surprise here), just
that in 2.16 case this weird ofport 7 appears out of nowhere according
to vswitchd log, and in fact there's no such ofport on the bridge.

Also flow counters are zero for 2.16 case:

cookie=0xb722108b439955c3, duration=81.938s, table=0, n_packets=0,
n_bytes=0, idle_age=81, priority=0 actions=resubmit(,60)

for 2.15 we see packets:

cookie=0xb722108b439955c3, duration=631.481s, table=0, n_packets=35,
n_bytes=2870, idle_age=20, priority=0 actions=resubmit(,60)

Not sure it's a neutron issue, probably openvswitch folks could point
some ways to debug.

** Changed in: neutron
       Status: Confirmed => Opinion

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https://bugs.launchpad.net/bugs/1969615

Title:
  OVS: flow loop is created with openvswitch version 2.16

Status in neutron:
  Opinion

Bug description:
  * Summary
  neutron-openvswitch-agent is causing a flow loop when using Openvswitch version 2.16.

  * High level description
  Running Neutron in Xena release using the openvswitch plugin is causing a flow loop when using openvswitch version 2.16. This does not occur when deploying openvswitch version 2.15.

  * Pre-conditions
  Ansible-Kolla based deployment using "source: ubuntu" in stable/xena release. neutron_plugin_agent: "openvswitch". Deploying a 3 node cluster with basic Openstack services.

  * Version:
   ** OpenStack version: Xena
   ** Linux distro: kolla-ansible stable/xena, Ubuntu 20.04.4 LTS

  * Step-by-step
  1. Deploy Openstack using kolla-ansible from stable/xena branch
  2. Create a project network/subnet for Octavia
  3. Create Octavia health-manager ports in Neutron for the 3 control nodes
  4. Create the ports on each control node as ovs bridge ports
  5. Assign IP addresses to the o-hm0 interfaces on all 3 nodes
  6. try to ping one node from another node

  ubuntu@ctl1:~$ openstack network show lb-mgmt
  +---------------------------+--------------------------------------+
  | Field                     | Value                                |
  +---------------------------+--------------------------------------+
  | admin_state_up            | UP                                   |
  | availability_zone_hints   |                                      |
  | availability_zones        | nova                                 |
  | created_at                | 2022-04-20T10:36:26Z                 |
  | description               |                                      |
  | dns_domain                | None                                 |
  | id                        | c0c1b3ec-a6c3-4145-b94a-6c7fa4d7a740 |
  | ipv4_address_scope        | None                                 |
  | ipv6_address_scope        | None                                 |
  | is_default                | None                                 |
  | is_vlan_transparent       | None                                 |
  | mtu                       | 1450                                 |
  | name                      | lb-mgmt                              |
  | port_security_enabled     | True                                 |
  | project_id                | 6cbb86e577a042499529110f6a1e8603     |
  | provider:network_type     | vxlan                                |
  | provider:physical_network | None                                 |
  | provider:segmentation_id  | 577                                  |
  | qos_policy_id             | None                                 |
  | revision_number           | 2                                    |
  | router:external           | Internal                             |
  | segments                  | None                                 |
  | shared                    | False                                |
  | status                    | ACTIVE                               |
  | subnets                   | bf004f5a-4cae-4277-a3f4-a4cf787033cb |
  | tags                      |                                      |
  | updated_at                | 2022-04-20T10:36:28Z                 |
  +---------------------------+--------------------------------------+

  ubuntu@ctl1:~$ openstack subnet show lb-mgmt
  +----------------------+--------------------------------------+
  | Field                | Value                                |
  +----------------------+--------------------------------------+
  | allocation_pools     | 172.16.1.1-172.16.255.254            |
  | cidr                 | 172.16.0.0/16                        |
  | created_at           | 2022-04-20T10:36:28Z                 |
  | description          |                                      |
  | dns_nameservers      |                                      |
  | dns_publish_fixed_ip | None                                 |
  | enable_dhcp          | True                                 |
  | gateway_ip           | 172.16.0.1                           |
  | host_routes          |                                      |
  | id                   | bf004f5a-4cae-4277-a3f4-a4cf787033cb |
  | ip_version           | 4                                    |
  | ipv6_address_mode    | None                                 |
  | ipv6_ra_mode         | None                                 |
  | name                 | lb-mgmt                              |
  | network_id           | c0c1b3ec-a6c3-4145-b94a-6c7fa4d7a740 |
  | project_id           | 6cbb86e577a042499529110f6a1e8603     |
  | revision_number      | 0                                    |
  | segment_id           | None                                 |
  | service_types        |                                      |
  | subnetpool_id        | None                                 |
  | tags                 |                                      |
  | updated_at           | 2022-04-20T10:36:28Z                 |
  +----------------------+--------------------------------------+

  openstack port list --device-owner octavia:health-mgrr
  +--------------------------------------+--------------+-------------------+----------------------------------------------------------------------------+--------+
  | ID                                   | Name         | MAC Address       | Fixed IP Addresses                                                         | Status |
  +--------------------------------------+--------------+-------------------+----------------------------------------------------------------------------+--------+
  | b0c8a28b-b652-4dce-a1b2-4a81e74d74ad | lb-mgmt-ctl1 | fa:17:20:16:00:11 | ip_address='172.16.0.11', subnet_id='bf004f5a-4cae-4277-a3f4-a4cf787033cb' | ACTIVE |
  | cfdb1171-21de-448b-a6b4-5c473e13ca12 | lb-mgmt-ctl3 | fa:17:20:16:00:13 | ip_address='172.16.0.13', subnet_id='bf004f5a-4cae-4277-a3f4-a4cf787033cb' | ACTIVE |
  | ea66498a-edb9-415b-b49e-fb005b635d75 | lb-mgmt-ctl2 | fa:17:20:16:00:12 | ip_address='172.16.0.12', subnet_id='bf004f5a-4cae-4277-a3f4-a4cf787033cb' | ACTIVE |
  +--------------------------------------+--------------+-------------------+----------------------------------------------------------------------------+--------+

  ubuntu@ctl1:~$ ip a s o-hm0
  10: o-hm0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc noqueue state UNKNOWN group default qlen 1000
      link/ether fa:17:20:16:00:11 brd ff:ff:ff:ff:ff:ff
      inet 172.16.0.11/16 brd 172.16.255.255 scope global o-hm0
         valid_lft forever preferred_lft forever
      inet6 fe80::f817:20ff:fe16:11/64 scope link 
         valid_lft forever preferred_lft forever

  ubuntu@ctl1:~$ ovs-vsctl --columns name,external-ids,ofport,error find Interface name='o-hm0'
  name                : o-hm0
  external_ids        : {attached-mac="fa:17:20:16:00:11", iface-id="b0c8a28b-b652-4dce-a1b2-4a81e74d74ad", iface-status=active, skip_cleanup="true"}
  ofport              : 4
  error               : []

  ubuntu@ctl3:~$ ip a s o-hm0
  9: o-hm0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc noqueue state UNKNOWN group default qlen 1000
      link/ether fa:17:20:16:00:13 brd ff:ff:ff:ff:ff:ff
      inet 172.16.0.13/16 brd 172.16.255.255 scope global o-hm0
         valid_lft forever preferred_lft forever
      inet6 fe80::f817:20ff:fe16:13/64 scope link 
         valid_lft forever preferred_lft forever

  ubuntu@ctl3:~$ ovs-vsctl --columns name,external-ids,ofport,error find Interface name='o-hm0'
  name                : o-hm0
  external_ids        : {attached-mac="fa:17:20:16:00:13", iface-id="cfdb1171-21de-448b-a6b4-5c473e13ca12", iface-status=active, skip_cleanup="true"}
  ofport              : 3
  error               : []

  ubuntu@ctl1:~$ ping 172.16.0.13
  PING 172.16.0.13 (172.16.0.13) 56(84) bytes of data.
  ^C
  --- 172.16.0.13 ping statistics ---
  2 packets transmitted, 0 received, 100% packet loss, time 1025ms

  ctl1:/var/log/kolla/openvswitch/ovs-vswitchd.log:

  2022-04-20T10:38:14.051Z|00004|ofproto_dpif_xlate(handler1)|WARN|over max translation depth 64 on bridge br-int while processing ct_state=new|trk,ct_nw_src=172.16.0.11,ct_nw_dst=172.16.0.13,ct_nw_proto=1,ct_tp_src=8,ct_tp_dst=0,icmp,in_port=4,vlan_tci=0x0000,dl_src=fa:17:20:16:00:11,dl_dst=fa:17:20:16:00:13,nw_src=172.16.0.11,nw_dst=172.16.0.13,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
  2022-04-20T10:38:14.051Z|00005|ofproto_dpif_upcall(handler1)|WARN|Flow: ct_state=new|trk,ct_nw_src=172.16.0.11,ct_nw_dst=172.16.0.13,ct_nw_proto=1,ct_tp_src=8,ct_tp_dst=0,icmp,in_port=6,vlan_tci=0x0000,dl_src=fa:17:20:16:00:11,dl_dst=fa:17:20:16:00:13,nw_src=172.16.0.11,nw_dst=172.16.0.13,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

  bridge("br-int")
  ----------------
   0. priority 0, cookie 0x557db8f9194e8693
      goto_table:60
  60. priority 3, cookie 0x557db8f9194e8693
      NORMAL
       >>>> received packet on unknown port 6 <<<<
       >> no input bundle, dropping

  Final flow: unchanged
  Megaflow: recirc_id=0,eth,ip,in_port=6,dl_src=fa:17:20:16:00:11,dl_dst=fa:17:20:16:00:13,nw_frag=no
  Datapath actions: drop
  2022-04-20T10:38:47.322Z|00092|connmgr|INFO|br-tun<->tcp:127.0.0.1:6633: 10 flow_mods in the 2 s starting 53 s ago (10 adds)
  2022-04-20T10:39:12.418Z|00006|ofproto_dpif_xlate(handler1)|WARN|over max translation depth 64 on bridge br-int while processing ct_state=new|trk,ct_nw_src=172.16.0.11,ct_nw_dst=172.16.0.13,ct_nw_proto=1,ct_tp_src=8,ct_tp_dst=0,icmp,in_port=4,vlan_tci=0x0000,dl_src=fa:17:20:16:00:11,dl_dst=fa:17:20:16:00:13,nw_src=172.16.0.11,nw_dst=172.16.0.13,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
  2022-04-20T10:57:38.785Z|00007|ofproto_dpif_xlate(handler1)|WARN|over max translation depth 64 on bridge br-int while processing ct_state=new|trk,ct_nw_src=172.16.0.11,ct_nw_dst=172.16.0.13,ct_nw_proto=1,ct_tp_src=8,ct_tp_dst=0,icmp,in_port=4,vlan_tci=0x0000,dl_src=fa:17:20:16:00:11,dl_dst=fa:17:20:16:00:13,nw_src=172.16.0.11,nw_dst=172.16.0.13,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
  2022-04-20T10:57:38.785Z|00008|ofproto_dpif_upcall(handler1)|WARN|Dropped 1 log messages in last 1107 seconds (most recently, 1107 seconds ago) due to excessive rate
  2022-04-20T10:57:38.786Z|00009|ofproto_dpif_upcall(handler1)|WARN|Flow: ct_state=new|trk,ct_nw_src=172.16.0.11,ct_nw_dst=172.16.0.13,ct_nw_proto=1,ct_tp_src=8,ct_tp_dst=0,icmp,in_port=6,vlan_tci=0x0000,dl_src=fa:17:20:16:00:11,dl_dst=fa:17:20:16:00:13,nw_src=172.16.0.11,nw_dst=172.16.0.13,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

  bridge("br-int")
  ----------------
   0. priority 0, cookie 0x557db8f9194e8693
      goto_table:60
  60. priority 3, cookie 0x557db8f9194e8693
      NORMAL
       >>>> received packet on unknown port 6 <<<<
       >> no input bundle, dropping

  Final flow: unchanged
  Megaflow: recirc_id=0,eth,ip,in_port=6,dl_src=fa:17:20:16:00:11,dl_dst=fa:17:20:16:00:13,nw_frag=no
  Datapath actions: drop

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References