netdev - Re: [PATCH net-next v9 2/4] net: Introduce generic failover module

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Date:   Sat, 28 Apr 2018 10:15:42 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Sridhar Samudrala <sridhar.samudrala@...el.com>
Cc:     mst@...hat.com, stephen@...workplumber.org, davem@...emloft.net,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org, jesse.brandeburg@...el.com,
        alexander.h.duyck@...el.com, kubakici@...pl, jasowang@...hat.com,
        loseweigh@...il.com, aaron.f.brown@...el.com
Subject: Re: [PATCH net-next v9 2/4] net: Introduce generic failover module

Fri, Apr 27, 2018 at 07:06:58PM CEST, sridhar.samudrala@...el.com wrote:
>This provides a generic interface for paravirtual drivers to listen
>for netdev register/unregister/link change events from pci ethernet
>devices with the same MAC and takeover their datapath. The notifier and
>event handling code is based on the existing netvsc implementation.
>
>It exposes 2 sets of interfaces to the paravirtual drivers.
>1. For paravirtual drivers like virtio_net that use 3 netdev model, the
>   the failover module provides interfaces to create/destroy additional
>   master netdev and all the slave events are managed internally.
>        net_failover_create()
>        net_failover_destroy()
>   A failover netdev is created that acts a master device and controls 2
>   slave devices. The original virtio_net netdev is registered as 'standby'
>   netdev and a passthru/vf device with the same MAC gets registered as
>   'primary' netdev. Both 'standby' and 'primary' netdevs are associated
>   with the same 'pci' device.  The user accesses the network interface via

'standby' and 'primary' netdevs are not associated with the same 'pci'
device.
"Primary" is the VF netdevice and "standby" is virtio_net. Each
associated with different pci device.


>   'failover' netdev. The 'failover' netdev chooses 'primary' netdev as
>   default for transmits when it is available with link up and running.
>2. For existing netvsc driver that uses 2 netdev model, no master netdev
>   is created. The paravirtual driver registers each instance of netvsc
>   as a 'failover' netdev  along with a set of ops to manage the slave
>   events. There is no 'standby' netdev in this model. A passthru/vf device
>   with the same MAC gets registered as 'primary' netdev.
>        net_failover_register()
>        net_failover_unregister()

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