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

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Message-ID: <20120830143457.GA21646@redhat.com>
Date:	Thu, 30 Aug 2012 17:34:57 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Vlad Yasevich <vyasevic@...hat.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH bridge 0/5] Add basic VLAN support to bridges

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?

> >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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