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

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Date:   Thu, 5 Aug 2021 21:02:23 +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 08:35:59PM +0300, Leon Romanovsky wrote:
> 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?

BTW, the current implementation where in_reload before if, actually
preserves same behaviour as was with devlink_reload_enable() implementation.

Thanks

> 
> Thanks