net: Introduce generic failover module

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 migration of VMs with direct attached VFs by
failing over to the paravirtual datapath when the VF is unplugged.

Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index f492431b239b..6c59bdf49a8a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5411,6 +5411,14 @@ S:	Maintained
 F:      Documentation/hwmon/f71805f
 F:      drivers/hwmon/f71805f.c
 
+FAILOVER MODULE
+M:      Sridhar Samudrala <sridhar.samudrala@intel.com>
+L:      netdev@vger.kernel.org
+S:      Supported
+F:      net/core/failover.c
+F:      include/net/failover.h
+F:      Documentation/networking/failover.rst
+
 FANOTIFY
 M:      Jan Kara <jack@suse.cz>
 R:      Amir Goldstein <amir73il@gmail.com>