netdev - Re: [PATCH net-next v1] netdevsim: Forbid devlink reload when adding or deleting ports

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Message-ID: <20210805082756.0b4e61d7@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 5 Aug 2021 08:27:56 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1] netdevsim: Forbid devlink reload when
 adding or deleting ports

On Thu, 5 Aug 2021 17:33:35 +0300 Leon Romanovsky wrote:
> On Thu, Aug 05, 2021 at 07:23:42AM -0700, Jakub Kicinski wrote:
> > > This is what devlink_reload_disable() returns, so I kept same error.
> > > It is not important at all.
> > > 
> > > What about the following change on top of this patch?  
> > 
> > LGTM, the only question is whether we should leave in_reload true 
> > if nsim_dev->fail_reload is set.  
> 
> I don't think so, it will block add/delete ports.

As it should, given add/delete ports takes the port_list_lock which is
destroyed by down but not (due to the forced failure) re-initialized by
up.

If we want to handle adding ports while down we can just bump port
count and return, although I don't think there's a practical need
to support that.