netdev - Re: [PATCH v4 0/3] net: dsa: mv88e6xxx: add support for VLAN Table Unit

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Date:	Wed, 8 Jul 2015 22:08:52 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	netdev <netdev@...r.kernel.org>, David <davem@...emloft.net>,
	Scott Feldman <sfeldma@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Florian Fainelli <f.fainelli@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kernel <kernel@...oirfairelinux.com>
Subject: Re: [PATCH v4 0/3] net: dsa: mv88e6xxx: add support for VLAN Table
 Unit

> > This is a limitation of the switch. So the driver needs to keep track
> > of which bridge a VLAN belongs to, if it is asked to accelerate the
> > same VLAN for a different bridge, it needs to say to the kernel,
> > sorry, cannot do that, and leave the kernel to do it in software.
> 
> Scott, how do you think this must be done? Returning a different error
> code when trying to add a SWITCHDEV_OBJ_PORT_VLAN object?
> Not sure how to query this fallback. Is -EOPNOTSUPP enough?

There was quite a bit of discussion about this a while back.  It
should return an error during the prepare phase. Looking at
__vlan_vid_add() and switchdev_fib_ipv4_add, it should return
EOPNOTSUPP.

	  Andrew
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