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[Bug 1974183] [NEW] Neutron allows creation of trunks for VIF_TYPE_HW_VEB ports

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Public bug reported:

There's no trunk driver supporting VIF_TYPE_HW_VEB ports [1,2,3], yet
Neutron allows trunks to be created for them. I think it should rejected
on validation.

[1] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/openvswitch/driver.py#L31-L34
[2] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/ovn/trunk_driver.py#L29-L32
[3] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/linuxbridge/driver.py#L25-L27

** Affects: neutron
     Importance: Undecided
         Status: New

** Description changed:

  There's no trunk driver supporting these ports [1,2,3], yet Neutron
- allows trunks to be created for such ports.
+ allows trunks to be created for such ports. I think it should not be
+ allowed when doing validation.
  
  [1] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/openvswitch/driver.py#L31-L34
  [2] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/ovn/trunk_driver.py#L29-L32
  [3] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/linuxbridge/driver.py#L25-L27

** Description changed:

- There's no trunk driver supporting these ports [1,2,3], yet Neutron
- allows trunks to be created for such ports. I think it should not be
- allowed when doing validation.
+ There's no trunk driver supporting VIF_TYPE_HW_VEB ports [1,2,3], yet
+ Neutron allows trunks to be created for them. I think it should rejected
+ on validation.
  
  [1] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/openvswitch/driver.py#L31-L34
  [2] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/ovn/trunk_driver.py#L29-L32
  [3] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/linuxbridge/driver.py#L25-L27

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https://bugs.launchpad.net/bugs/1974183

Title:
  Neutron allows creation of trunks for VIF_TYPE_HW_VEB ports

Status in neutron:
  New

Bug description:
  There's no trunk driver supporting VIF_TYPE_HW_VEB ports [1,2,3], yet
  Neutron allows trunks to be created for them. I think it should
  rejected on validation.

  [1] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/openvswitch/driver.py#L31-L34
  [2] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/ovn/trunk_driver.py#L29-L32
  [3] https://github.com/openstack/neutron/blob/b1f48d8da3a6017a49f2a9ece89b9dc01ba8a810/neutron/services/trunk/drivers/linuxbridge/driver.py#L25-L27

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