• Sridhar Samudrala's avatar
    net: Introduce net_failover driver · cfc80d9a
    Sridhar Samudrala authored
    The net_failover driver provides an automated failover mechanism via APIs
    to create and destroy a failover master netdev and manages a primary and
    standby slave netdevs that get registered via the generic failover
    The failover netdev acts a master device and controls 2 slave devices. The
    original paravirtual interface gets registered as 'standby' slave netdev and
    a passthru/vf device with the same MAC gets registered as 'primary' slave
    netdev. Both 'standby' and 'failover' netdevs are associated with the same
    'pci' device. The user accesses the network interface via 'failover' netdev.
    The 'failover' netdev chooses 'primary' netdev as default for transmits when
    it is available with link up and running.
    This can be used by paravirtual drivers to enable an alternate low latency
    datapath. It also enables hypervisor controlled live migration of a VM with
    direct attached VF by failing over to the paravirtual datapath when the VF
    is unplugged.
    Signed-off-by: default avatarSridhar Samudrala <sridhar.samudrala@intel.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>