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Commit cfc80d9a authored by Sridhar Samudrala's avatar Sridhar Samudrala Committed by David S. Miller
Browse files

net: Introduce net_failover driver 



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
infrastructure.

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>
parent 1ff78076

Documentation/networking/net_failover.rst

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.. SPDX-License-Identifier: GPL-2.0



============

NET_FAILOVER

============



Overview

========



The net_failover driver provides an automated failover mechanism via APIs

to create and destroy a failover master netdev and mananges a primary and

standby slave netdevs that get registered via the generic failover

infrastructrure.



The failover netdev acts a master device and controls 2 slave devices. The

original paravirtual interface is 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.

MAINTAINERS

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@@ -9654,6 +9654,14 @@ S: Maintained 
F:	Documentation/hwmon/nct6775

F:	drivers/hwmon/nct6775.c



NET_FAILOVER MODULE

M:	Sridhar Samudrala <sridhar.samudrala@intel.com>

L:	netdev@vger.kernel.org

S:	Supported

F:	driver/net/net_failover.c

F:	include/net/net_failover.h

F:	Documentation/networking/net_failover.rst



NETEFFECT IWARP RNIC DRIVER (IW_NES)

M:	Faisal Latif <faisal.latif@intel.com>

L:	linux-rdma@vger.kernel.org

drivers/net/Kconfig

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@@ -510,4 +510,16 @@ config NETDEVSIM 
	  To compile this driver as a module, choose M here: the module

	  will be called netdevsim.



config NET_FAILOVER

	tristate "Failover driver"

	select FAILOVER

	help

	  This 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

	  infrastructure. This can be used by paravirtual drivers to enable

	  an alternate low latency datapath. It alsoenables live migration of

	  a VM with direct attached VF by failing over to the paravirtual

	  datapath when the VF is unplugged.



endif # NETDEVICES

drivers/net/Makefile

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@@ -78,3 +78,4 @@ obj-$(CONFIG_FUJITSU_ES) += fjes/ 
thunderbolt-net-y += thunderbolt.o

obj-$(CONFIG_THUNDERBOLT_NET) += thunderbolt-net.o

obj-$(CONFIG_NETDEVSIM) += netdevsim/

obj-$(CONFIG_NET_FAILOVER) += net_failover.o

drivers/net/net_failover.c

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