netdev - Re: [Bridge] [PATCH 2/3] bridge: Add filtering support for default

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Message-ID: <54181A93.2070604@lab.ntt.co.jp>
Date:	Tue, 16 Sep 2014 20:10:11 +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 2/3] bridge: Add filtering support for default_pvid

On 2014/09/16 0:09, Vlad Yasevich wrote:
> On 09/14/2014 11:21 AM, Toshiaki Makita wrote:
>> (14/09/13 (土) 5:44), Vladislav Yasevich wrote:
>>> Currently when vlan filtering is turned on on the bridge, the bridge
>>> will drop all traffic untill the user configures the filter.  This
>>> isn't very nice for ports that don't care about vlans and just
>>> want untagged traffic.
>>>
>>> A concept of a default_pvid was recently introduced.  This patch
>>> adds filtering support for default_pvid.   Now, ports that don't
>>> care about vlans and don't define there own filter will belong
>>> to the VLAN of the default_pvid and continue to receive untagged
>>> traffic.
>>
>> If user sets pvid, then vid 1 (default_pvid) will become non-pvid but
>> still not be filtered, right?
> 
> Right.
> 
>> vlan_bitmap of default_pvid shouldn't be cleared on setting pvid?
> 
> I can see arguments for both.  Just because the user wishes to set a
> different pvid may not always mean that vlan associated with default pvid
> shouldn't be filtered.  I think it's at user's discretion.  I hesitate
> to do too many things automatically.

On second thought, I agree with you.
It's reasonable that what default_pvid should do is only to set pvid on
adding a bridge/port.

My another concern is how we can disable default_pvid, since this
feature is originally non-existent.

Thanks,
Toshiaki Makita
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