netdev - Re: [PATCH net-next v2 01/12] net: bridge: multicast: Propagate br_mc_disabled

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Date:   Thu, 31 Jan 2019 07:50:16 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     Florian Fainelli <f.fainelli@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        "ilias.apalodimas@...aro.org" <ilias.apalodimas@...aro.org>,
        "ivan.khoronzhuk@...aro.org" <ivan.khoronzhuk@...aro.org>,
        "roopa@...ulusnetworks.com" <roopa@...ulusnetworks.com>,
        "nikolay@...ulusnetworks.com" <nikolay@...ulusnetworks.com>,
        Petr Machata <petrm@...lanox.com>
Subject: Re: [PATCH net-next v2 01/12] net: bridge: multicast: Propagate
 br_mc_disabled_update() return

On Wed, Jan 30, 2019 at 05:00:57PM -0800, Florian Fainelli wrote:
> On 1/29/19 11:36 PM, Ido Schimmel wrote:
> > On Tue, Jan 29, 2019 at 04:55:37PM -0800, Florian Fainelli wrote:
> >> -static void br_mc_disabled_update(struct net_device *dev, bool value)
> >> +static int br_mc_disabled_update(struct net_device *dev, bool value)
> >>  {
> >>  	struct switchdev_attr attr = {
> >>  		.orig_dev = dev,
> >>  		.id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
> >> -		.flags = SWITCHDEV_F_DEFER,
> >> +		.flags = SWITCHDEV_F_DEFER | SWITCHDEV_F_SKIP_EOPNOTSUPP,
> > 
> > Actually, since the operation is deferred I don't think the return value
> > from the driver is ever checked. Can you test it?
> 
> You are right, you get a WARN() from switchdev_attr_port_set_now(), but
> this does not propagate back to the caller, so you can still create a
> bridge device and enslave a device successfully despite getting warnings
> on the console.
> 
> > 
> > I think it would be good to convert the attributes to use the switchdev
> > notifier like commit d17d9f5e5143 ("switchdev: Replace port obj add/del
> > SDO with a notification") did for objects. Then you can have your
> > listener veto the operation in the same context it is happening.
> 
> Alright, working on it. Would you do that just for the attr_set, or for
> attr_get as well (to be symmetrical)?

Yes, then we can get rid of switchdev_ops completely.