AD_CHURN_MONITOR
WRITE_ONCE(port->sm_churn_actor_state, AD_CHURN_MONITOR);
WRITE_ONCE(port->sm_churn_partner_state, AD_CHURN_MONITOR);
port->sm_churn_actor_state == AD_CHURN_MONITOR) {
port->sm_churn_partner_state == AD_CHURN_MONITOR) {