There is missing automation step for setting nicMappings required for OVN gateways on RHOCP in data plane adoption test suite. There were docs improvements proposed as a part of https://issues.redhat.com/browse/OSPRH-14900, but I don't see corresponding ansible automation. 

Note: During neutron meeting, the recommendation is:
1- controllers as networker to avoid loss connectivity (related to: https://issues.redhat.com/browse/OSPRH-17641) 
2- and then the gw will be set on ocp with the patch: 

$ oc patch openstackcontrolplane openstack --type=merge --patch '
spec:
  ovn:
    enabled: true
    template:
      ovnController:
        nicMappings:
          physNet: NIC (1) 

Slack thread: https://redhat-internal.slack.com/archives/C04J1D40W4W/p1751020137074269