netdev - Re: [Bridge] [PATCH 3/3] bridge; Automatically filter vlans configured on top of bridge

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Date:	Tue, 16 Sep 2014 20:28:01 +0900
From:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:	vyasevic@...hat.com, Toshiaki Makita <toshiaki.makita1@...il.com>,
	Vladislav Yasevich <vyasevich@...il.com>,
	netdev@...r.kernel.org
CC:	shemminger@...tta.com, bridge@...ts.linux-foundation.org
Subject: Re: [Bridge] [PATCH 3/3] bridge; Automatically filter vlans configured
 on top of bridge

On 2014/09/16 0:19, Vlad Yasevich wrote:
> On 09/14/2014 11:39 AM, Toshiaki Makita wrote:
>> (14/09/13 (土) 5:44), Vladislav Yasevich wrote:
>>> If the user configures vlan devices on top of the bridge,
>>> automatically set up filter entries for it as long as
>>> bridge vlan protocol matches that of the vlan.
>>> This allows the user to atomatically receive vlan traffic
>>> for the vlans that are convifgured.
>>
>> Changing br->vlan_proto seems to cause inconsistency between vlan
>> interfaces and filter settings.
>> Can we automatically change filters when setting vlan_proto?
>>
> 
> I thought we already do that in br_vlan_set_proto()?  Nothing
> here introduces any new kinds of issue with that code.

I'm referring to a case like this:
1. create br0.10 (802.1ad)
2. change br->vlan_proto into 88a8

When creating br0.10 (1), br->vlan_proto is 8100 and different from
protocol of br0.10, so it is ignored by br_vlan_rx_add_vid().
After changing br->vlan_proto (2), we might expect vlan 10 is not
filtered on br0, but it will be filtered.

Thanks,
Toshiaki Makita

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