net: Introduce net_failover driver (cfc80d9a) · Commits · 戴 / test

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.

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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

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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

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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

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