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

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Message-ID: <YQwhf+3oeqOv/OMU@unreal>
Date:   Thu, 5 Aug 2021 20:35:59 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...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, Aug 05, 2021 at 08:27:56AM -0700, Jakub Kicinski wrote:
> 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.

Sorry, but for me netdevsim looks like complete dumpster. It was
intended for fast prototyping, but ended to be huge pile of debugfs
entries and selftest to execute random flows.

Do you want me to move in_reload = false line to be after if (nsim_dev->fail_reload)
check?

Thanks