netdev - Re: [PATCH net-next 0/6] Allow parallel devlink execution

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Message-ID: <Ya8NPxxn8/OAF4cR@unreal>
Date:   Tue, 7 Dec 2021 09:29:03 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Ido Schimmel <idosch@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/6] Allow parallel devlink execution

On Mon, Dec 06, 2021 at 06:00:27PM -0800, Jakub Kicinski wrote:
> On Sun,  5 Dec 2021 10:22:00 +0200 Leon Romanovsky wrote:
> > This is final piece of devlink locking puzzle, where I remove global
> > mutex lock (devlink_mutex), so we can run devlink commands in parallel.
> > 
> > The series starts with addition of port_list_lock, which is needed to
> > prevent locking dependency between netdevsim sysfs and devlink. It
> > follows by the patch that adds context aware locking primitives. Such
> > primitives allow us to make sure that devlink instance is locked and
> > stays locked even during reload operation. The last patches opens
> > devlink to parallel commands.
> 
> I'm not okay with assuming that all sub-objects are added when devlink
> is not registered.

But none of the patches in this series assume that.

In devlink_nested_lock() patch [1], I added new marker just to make sure
that we don't lock if this specific command is called in locked context.

+#define DEVLINK_NESTED_LOCK XA_MARK_2

[1] https://lore.kernel.org/all/2b64a2a81995b56fec0231751ff6075020058584.1638690564.git.leonro@nvidia.com/