linux-kernel - Re: [RFC PATCH net-next 2/2] net: dsa: support SWITCHDEV_ATTR_ID_PORT_BRIDGE

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Date:	Wed, 9 Mar 2016 19:32:13 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...oirfairelinux.com,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Scott Feldman <sfeldma@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Ido Schimmel <idosch@...lanox.com>,
	nikolay@...ulusnetworks.com, Elad Raz <eladr@...lanox.com>
Subject: Re: [RFC PATCH net-next 2/2] net: dsa: support
 SWITCHDEV_ATTR_ID_PORT_BRIDGE_IF

Hi Vivien

> -static bool dsa_slave_dev_check(struct net_device *dev)
> -{
> -	return dev->netdev_ops == &dsa_slave_netdev_ops;
> -}

Where is the equivalent of this happening? Where do we check that the
interface added to the bridge is part of the switch?

> -int dsa_slave_netdevice_event(struct notifier_block *unused,
> -			      unsigned long event, void *ptr)
> -{
> -	struct net_device *dev;
> -	int err = 0;
> -
> -	switch (event) {
> -	case NETDEV_CHANGEUPPER:
> -		dev = netdev_notifier_info_to_dev(ptr);
> -		if (!dsa_slave_dev_check(dev))
> -			goto out;
> -
> -		err = dsa_slave_master_changed(dev);
> -		if (err && err != -EOPNOTSUPP)
> -			netdev_warn(dev, "failed to reflect master change\n");
> -
> -		break;
> -	}
> -
> -out:
> -	return NOTIFY_DONE;
> -}

How about team/bonding? We are not ready to implement it yet with the
Marvell devices, but at some point we probably will. Won't we need the
events then? We need to know when a switch port has been added to a
team?

Or do you think a switchdev object will be added for this case?
Mellanox already have the ability to add switch interfaces to a team,
and then add the team to a bridge. So we need to ensure your solution
works for such stacked systems.

      Andrew