[Bug 1980121] [NEW] [ovn] stateless NAT is set for FIPs by default instead of stateful, affecting HW Offload

[Itai Levy]

Public bug reported:

Charmed OpenStack (Yoga / Jammy)

It seems like by default when creating a Floating IP, it will be set in
OVN with stateless NAT option:

root at juju-16f12b-1-lxd-9:/home/ubuntu#  ovn-nbctl find NAT type=dnat_and_snat
_uuid               : aa79f2ab-255d-4ca5-8854-699c0ce25e45
allowed_ext_ips     : []
exempted_ext_ips    : []
external_ids        : {"neutron:fip_external_mac"="fa:16:3e:89:60:a0", "neutron:fip_id"="136d7c6f-4872-4712-8102-63eafcaac190", "neutron:fip_network_id"="5434854a-3c22-4c50-880b-1aa12e2bc7d2", "neutron:fip_port_id"="37a5592b-f2b4-469b-b094-8f3f1de9b5f2", "neutron:revision_number"="14", "neutron:router_name"=neutron-f0821093-56b2-4a3b-86fe-aa982ef90c3f}
external_ip         : "10.7.208.90"
external_mac        : []
external_port_range : ""
logical_ip          : "33.33.33.52"
logical_port        : "37a5592b-f2b4-469b-b094-8f3f1de9b5f2"
options             : {stateless="true"}
type                : dnat_and_snat


This behaviour is affecting HW Offload, and should be reverted to STATEFUL per https://review.opendev.org/c/openstack/neutron/+/838776

** Affects: neutron (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1980121

Title:
  [ovn] stateless NAT is set for FIPs by default instead of stateful,
  affecting HW Offload

Status in neutron package in Ubuntu:
  New

Bug description:
  Charmed OpenStack (Yoga / Jammy)

  It seems like by default when creating a Floating IP, it will be set
  in OVN with stateless NAT option:

  root at juju-16f12b-1-lxd-9:/home/ubuntu#  ovn-nbctl find NAT type=dnat_and_snat
  _uuid               : aa79f2ab-255d-4ca5-8854-699c0ce25e45
  allowed_ext_ips     : []
  exempted_ext_ips    : []
  external_ids        : {"neutron:fip_external_mac"="fa:16:3e:89:60:a0", "neutron:fip_id"="136d7c6f-4872-4712-8102-63eafcaac190", "neutron:fip_network_id"="5434854a-3c22-4c50-880b-1aa12e2bc7d2", "neutron:fip_port_id"="37a5592b-f2b4-469b-b094-8f3f1de9b5f2", "neutron:revision_number"="14", "neutron:router_name"=neutron-f0821093-56b2-4a3b-86fe-aa982ef90c3f}
  external_ip         : "10.7.208.90"
  external_mac        : []
  external_port_range : ""
  logical_ip          : "33.33.33.52"
  logical_port        : "37a5592b-f2b4-469b-b094-8f3f1de9b5f2"
  options             : {stateless="true"}
  type                : dnat_and_snat

  
  This behaviour is affecting HW Offload, and should be reverted to STATEFUL per https://review.opendev.org/c/openstack/neutron/+/838776

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