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

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Date:   Fri, 27 Apr 2018 19:53:45 +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
>   '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()
>
>Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
>---
> include/linux/netdevice.h  |  16 +
> include/net/net_failover.h |  62 ++++
> net/Kconfig                |  10 +
> net/core/Makefile          |   1 +
> net/core/net_failover.c    | 892 +++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 981 insertions(+)
> create mode 100644 include/net/net_failover.h
> create mode 100644 net/core/net_failover.c

checkpatch says:

_exportax/0002-net-Introduce-generic-failover-module.patch
----------------------------------------------------------
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#92: 
new file mode 100644

Please add an entry to the MAINTAINERS file.