[Bug 2122319] [NEW] OVN can't reuse "remote-managed" ports

[Giuseppe Petralia]

Public bug reported:

This is happening on an env using OVN 24.03 (ver.
24.03.2-0ubuntu0.24.04.1~cloud0) , OpenStack jammy-caracal, Ubuntu Jammy
release and NVIDIA BlueField-3 DPU.


When reusing remote-managed ports, ovn-controller stops working.

How to reproduce:

1. create a remote managed port with 
   "openstack port create --network $net --vnic-type remote-managed -f value -c id port" 

2. Create a VM using it 
   "openstack server create --port $port_id --flavor $flavor --image $image --user-data userdata.yaml --config-drive True test-vm"

3. Delete the VM 
   "openstack server delete test-vm"

4. Create new VM using existing port 
   "openstack server create --port $port_id --flavor $flavor --image $image --user-data userdata.yaml --config-drive True test-vm2"


After this ovn-controller stops working and logs 

```
2025-09-03T13:17:22.943Z|298514|vif_plug|WARN|Attempt of incompatible change to existing port detected, please recreate port: f97481cb-9fde-441a-903c-17e25d11e701
```


Deleting the re-used port fix the issue

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

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https://bugs.launchpad.net/bugs/2122319

Title:
  OVN can't reuse "remote-managed" ports

Status in ovn package in Ubuntu:
  New

Bug description:
  This is happening on an env using OVN 24.03 (ver.
  24.03.2-0ubuntu0.24.04.1~cloud0) , OpenStack jammy-caracal, Ubuntu
  Jammy release and NVIDIA BlueField-3 DPU.

  
  When reusing remote-managed ports, ovn-controller stops working.

  How to reproduce:

  1. create a remote managed port with 
     "openstack port create --network $net --vnic-type remote-managed -f value -c id port" 

  2. Create a VM using it 
     "openstack server create --port $port_id --flavor $flavor --image $image --user-data userdata.yaml --config-drive True test-vm"

  3. Delete the VM 
     "openstack server delete test-vm"

  4. Create new VM using existing port 
     "openstack server create --port $port_id --flavor $flavor --image $image --user-data userdata.yaml --config-drive True test-vm2"

  
  After this ovn-controller stops working and logs 

  ```
  2025-09-03T13:17:22.943Z|298514|vif_plug|WARN|Attempt of incompatible change to existing port detected, please recreate port: f97481cb-9fde-441a-903c-17e25d11e701
  ```

  
  Deleting the re-used port fix the issue

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