netdev - Re: [patch net-next 0/7] switchdev: change locking

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Date:	Mon, 12 Oct 2015 11:52:22 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, idosch@...lanox.com, eladr@...lanox.com,
	sfeldma@...il.com, f.fainelli@...il.com, linux@...ck-us.net,
	vivien.didelot@...oirfairelinux.com, andrew@...n.ch,
	john.fastabend@...il.com, David.Laight@...LAB.COM,
	stephen@...workplumber.org
Subject: Re: [patch net-next 0/7] switchdev: change locking

Sun, Oct 11, 2015 at 05:21:04PM CEST, jiri@...nulli.us wrote:
>From: Jiri Pirko <jiri@...lanox.com>
>
>This is something which I'm currently struggling with.
>Callers of attr_set and obj_add/del often hold not only RTNL, but also
>spinlock (bridge). So in that case, the driver implementing the op cannot sleep.
>
>The way rocker is dealing with this now is just to invoke driver operation
>and go out, without any checking or reporting of the operation status.
>
>Since it would be nice to at least put a warning in case the operation fails,
>it makes sense to do this in delayed work directly in switchdev core
>instead of implementing this in separate drivers. And that is what this patchset
>is introducing.
>
>So from now on, the locking of switchdev mod ops is consistent. Caller either
>holds rtnl mutex or in case it does not, caller sets defer flag, telling
>switchdev core to process the op later in delayed work.
>
>Flush function for switchdev deferred ops can be called by op
>caller in appropriate location, for example after it releases
>spin lock, to force switchdev core to process pending ops.

Dave, if you are going to apply
"[PATCH net-next v3 0/4] switchdev: push bridge ageing_time attribute down"
first, I have to rebase this patchset on top of that. Just say so.

Thanks!
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