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27 lines
1.0 KiB
ReStructuredText
27 lines
1.0 KiB
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.. SPDX-License-Identifier: GPL-2.0
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============
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NET_FAILOVER
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============
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Overview
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========
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The net_failover driver provides an automated failover mechanism via APIs
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to create and destroy a failover master netdev and mananges a primary and
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standby slave netdevs that get registered via the generic failover
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infrastructrure.
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The failover netdev acts a master device and controls 2 slave devices. The
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original paravirtual interface is registered as 'standby' slave netdev and
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a passthru/vf device with the same MAC gets registered as 'primary' slave
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netdev. Both 'standby' and 'failover' netdevs are associated with the same
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'pci' device. The user accesses the network interface via 'failover' netdev.
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The 'failover' netdev chooses 'primary' netdev as default for transmits when
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it is available with link up and running.
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This can be used by paravirtual drivers to enable an alternate low latency
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datapath. It also enables hypervisor controlled live migration of a VM with
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direct attached VF by failing over to the paravirtual datapath when the VF
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is unplugged.
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