netdev - Re: [patch net-next v2 1/3] net: devlink: allow to change namespaces

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Date:   Wed, 31 Jul 2019 21:26:27 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        sthemmin@...rosoft.com, dsahern@...il.com, mlxsw@...lanox.com
Subject: Re: [patch net-next v2 1/3] net: devlink: allow to change namespaces

Wed, Jul 31, 2019 at 12:39:52AM CEST, jakub.kicinski@...ronome.com wrote:
>On Tue, 30 Jul 2019 10:57:32 +0200, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>> 
>> All devlink instances are created in init_net and stay there for a
>> lifetime. Allow user to be able to move devlink instances into
>> namespaces.
>> 
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>
>I'm no namespace expert, but seems reasonable, so FWIW:
>
>Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>
>If I read things right we will only send the devlink instance
>notification to other namespaces when it moves, but not
>notifications for sub-objects like ports. Is the expectation 
>that the user space dumps the objects it cares about or will
>the other notifications be added as needed (or option 3 - I 
>misread the code).

You are correct. I plan to take care of the notifications of all objects
in the follow-up patchset. But I can do it in this one if needed. Up to
you.


>
>I was also wondering it moving the devlink instance during a 
>multi-part transaction could be an issue. But AFAIU it should 
>be fine - the flashing doesn't release the instance lock, and 
>health stuff should complete correctly even if devlink is moved
>half way through?

Yes, I don't see any issue there as well.