netdev - Re: [RFC 3/9] net: dsa: mv88e6xxx: add support for VTU ops

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Message-ID: <556E2EC2.3020104@cumulusnetworks.com>
Date:	Tue, 02 Jun 2015 15:31:30 -0700
From:	nolan <nolan@...ulusnetworks.com>
To:	Scott Feldman <sfeldma@...il.com>,
	Guenter Roeck <linux@...ck-us.net>
CC:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Andrew Lunn <andrew@...n.ch>, Jiri Pirko <jiri@...nulli.us>,
	Jerome Oufella <jerome.oufella@...oirfairelinux.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kernel@...oirfairelinux.com, Chris Healy <cphealy@...il.com>
Subject: Re: [RFC 3/9] net: dsa: mv88e6xxx: add support for VTU ops

On 06/02/2015 12:44 AM, Scott Feldman wrote:
> That brings up an interesting point about having multiple bridges with
> the same vlan configured.  I struggled with that problem with rocker
> also and I don't have an answer other than "don't do that".  Or,
> better put, if you have multiple bridge on the same vlan, just use one
> bridge for that vlan.  Otherwise, I don't know how at the device level
> to partition the vlan between the bridges.  Maybe that's what Vivien
> is facing also?  I can see how this works for software-only bridges,
> because they should be isolated from each other and independent.  But
> when offloading to a device which sees VLAN XXX global across the
> entire switch, I don't see how we can preserve the bridge boundaries.

Scott,

I'm confused by this.  I think you're saying this config is problematic:

br0: eth0.100, eth1.100
br1: eth2.100, eth3.100

But this works fine today.

Could you clarify the issue you're referring to?

Thanks,
- nolan
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