netdev - Re: [RFC PATCH bridge 0/5] Add basic VLAN support to bridges

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Message-ID: <503F7B7C.7050608@redhat.com>
Date:	Thu, 30 Aug 2012 10:41:00 -0400
From:	Vlad Yasevich <vyasevic@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH bridge 0/5] Add basic VLAN support to bridges

On 08/30/2012 10:34 AM, Michael S. Tsirkin wrote:
> On Thu, Aug 30, 2012 at 09:37:17AM -0400, Vlad Yasevich wrote:
>> On 08/30/2012 08:37 AM, Michael S. Tsirkin wrote:
>>> On Thu, Aug 23, 2012 at 03:29:50PM -0400, Vlad Yasevich wrote:
>>>> This series of patches provides an ability to add VLAN IDs to the bridge
>>>> ports.  This is similar to what can be found in most switches.  The bridge
>>>> port may have any number of VLANs added to it including vlan 0 for untagged
>>>> traffic.  When vlans are added to the port, only traffic tagged with particular
>>>> vlan will forwarded over this port.  Additionally, vlan ids are added to FDB
>>>> entries and become part of the lookup.  This way we correctly identify the FDB
>>>> entry.
>>>>
>>>> There are still pieces missing.  I don't yet support adding a static fdb entry
>>>> with a particular vlan.  There is no netlink support for carrying a vlan id.
>>>>
>>>> I'd like to hear thoughts of whether this is usufull and something we should
>>>> persue.
>>>>
>>>> The default behavior ofthe bridge is unchanged if no vlans have been
>>>> configured.
>>>
>>> Overall the feature looks good, I can think of some uses
>>> for it - for example, it could become useful for VMs if
>>> we add support to tap essentially stripping tags in Xmit but maybe you
>>> could be more explicit about what you have in mind?
>>> Do you plan to add tap support as well?
>>
>> Yes,  this is something I've thought of.  Not sure if it would be at tap
>> or bridge itself.  Need to work out where best to do it.
>
> It's certainly much easier to do in tap.
> A 20 line patch should do it.
> Does stripping tags seem like something bridge should do?

I agree.  It would be easier in tap.  There also the other side of 
adding tags for outbound traffic.  This would allow auto-access like 
functionality where the guest itself doesn't know anything about vlans,
but the bridge port will add/remove vlans as appropriate.  This is on
the list of features I want to support.

-vlad

>
>>> Also - what tool support do you plan?
>>
>> the patchset includes brctl to configure, but that seems to be
>> getting deprecated.  I am working on iproute2 to add capability to
>> configure this.
>>
>>>
>>> I also found some coding style issues and some bugs in
>>> the patchset. Sent on list.
>>
>> Thanks
>> -vlad
>>
>>>
>>> Hope this helps.
>>>

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