netdev - Re: [PATCH v3 net-next 09/14] net: dsa: Validate hardware support for MST

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Date:   Mon, 14 Mar 2022 19:55:56 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     davem@...emloft.net, kuba@...nel.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Russell King <linux@...linux.org.uk>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>,
        Cooper Lees <me@...perlees.com>,
        Matt Johnston <matt@...econstruct.com.au>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH v3 net-next 09/14] net: dsa: Validate hardware support
 for MST

On Mon, Mar 14, 2022 at 06:56:49PM +0200, Vladimir Oltean wrote:
> > diff --git a/net/dsa/port.c b/net/dsa/port.c
> > index 58291df14cdb..1a17a0efa2fa 100644
> > --- a/net/dsa/port.c
> > +++ b/net/dsa/port.c
> > @@ -240,6 +240,10 @@ static int dsa_port_switchdev_sync_attrs(struct dsa_port *dp,
> >  	if (err && err != -EOPNOTSUPP)
> >  		return err;
> >  
> > +	err = dsa_port_mst_enable(dp, br_mst_enabled(br), extack);
> > +	if (err && err != -EOPNOTSUPP)
> > +		return err;
> 
> Sadly this will break down because we don't have unwinding on error in
> place (sorry). We'd end up with an unoffloaded bridge port with
> partially synced bridge port attributes. Could you please add a patch
> previous to this one that handles this, and unoffloads those on error?

Actually I would rather rename the entire dsa_port_mst_enable() function
to dsa_port_mst_validate() and move it to the beginning of dsa_port_bridge_join().
This simplifies the unwinding that needs to take place quite a bit.