netdev - Re: [patch net-next 0/4] net: allow per-net notifier to follow netdev into namespace

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Message-ID: <20191221081406.GB2246@nanopsycho.orion>
Date:   Sat, 21 Dec 2019 09:14:06 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        jakub.kicinski@...ronome.com, saeedm@...lanox.com, leon@...nel.org,
        tariqt@...lanox.com, ayal@...lanox.com, vladbu@...lanox.com,
        michaelgur@...lanox.com, moshe@...lanox.com, mlxsw@...lanox.com
Subject: Re: [patch net-next 0/4] net: allow per-net notifier to follow
 netdev into namespace

Fri, Dec 20, 2019 at 07:30:22PM CET, dsahern@...il.com wrote:
>On 12/20/19 5:35 AM, Jiri Pirko wrote:
>> However if netdev can change namespace, per-net notifier cannot be used.
>> Introduce dev_net variant that is basically per-net notifier with an
>> extension that re-registers the per-net notifier upon netdev namespace
>> change. Basically the per-net notifier follows the netdev into
>> namespace.
>
>This is getting convoluted.
>
>If the driver wants notifications in a new namespace, then it should
>register for notifiers in the new namespace. The info for
>NETDEV_UNREGISTER event could indicate the device is getting moved to a
>new namespace and the driver register for notifications in the new

Yes, I considered this option. However, that would lead to having a pair
of notifier block struct for every registration and basically the same
tracking code would be implemented in every driver.

That is why i chose this implementation where there is still one
notifier block structure and the core takes care of the tracking for
all.


>namespace. If the drivers are trying to be efficient wrt to
>notifications then it will need to unregister when all netdevices leave
>a namespace which it means it has work to do on namespace changes.