.. SPDX-License-Identifier: GPL-2.0
  
  ========
  FAILOVER
  ========
  
  Overview
  ========
  
  The failover module provides a generic interface for paravirtual drivers
  to register a netdev and a set of ops with a failover instance. The ops
  are used as event handlers that get called to handle netdev register/
  unregister/link change/name change events on slave pci ethernet devices
  with the same mac address as the failover netdev.
  
  This enables paravirtual drivers to use a VF as an accelerated low latency
  datapath. It also allows live migration of VMs with direct attached VFs by
  failing over to the paravirtual datapath when the VF is unplugged.