[openstack-dev] [Openstack][Neutron][OVN] OVN-Neutron - TODO List

Salvatore Orlando sorlando at nicira.com
Sun Jun 14 16:58:04 UTC 2015


thanks for this summery.
Some additional info inline.


On 12 June 2015 at 19:38, Gal Sagie <gal.sagie at gmail.com> wrote:

> Hello All,
> I wanted to share some of our next working items and hopefully get more
> people on board with the project.
> I personally would mentor any new comer that wants to get familiar with
> the project and help
> with any of these items.
> You can also feel free to approach Russell Bryant (rbryant at redhat.com)
> which is heading the OVN-Openstack integration.
> We both are usually active on IRC at #openstack-neutron-ovn (freenode) ,
> you can drop us a visit if you have any questions.
> The Neutron sprint in Fort Collins [1] has a work item for OVN, hopefully
> some work can start
> there on some of these items (or others).
> Russell Bryant and myself unfortunately won't be there, but feel free to
> contact us online or in email.
> *1. Security Group Implementation*
> Currently security groups are not being configured to OVN, there is a
> document written
> about how to model security groups to OVN northbound ACL's. [2]
> I suspect getting this right is not going to be trivial, hopefully i might
> be able to also start tackling
> this item next week.

>From what I recall Miguel was very interested in helping out on this front.
Have you already reached out to him?

> *2. Provider Network support*
> Russell sent a design proposal to the ovs-dev mailing list [3], need to
> follow on that
> and implement in OVN

I think I have replied to that proposal with a few comments, perhaps you
might have a look at those.

> *3. Tempest configuration*
> Russell has a patch for that [4] which needs additional help to make it
> work.

That patch has merged now. So perhaps Russell does not need help anymore!

> *4. Unit Tests / Functional Tests *
> We want to start adding more testing to the project in all fronts
> *5. Integration with OVS-DPDK*
> OVS-DPDK has a ML2 mechanism driver [5] to enable userspace DPDK dataplane
> for OVS,
> we want to try and see how this can combine with OVN mechanism driver
> together. (one idea is to
> use hierarchical port binding for that)
> Need to design and test it and provide additional working items for this
> integration

I think this is a rare case where the OVN integration might leverage
additional mechanism drivers as AFAICT the DPDK driver mainly interacts
with VIF plugging (operating at the Neutron port bindings level), and does
not interfere with logical network resource processing.

> *6. L2 Gateway Integration*
> OVN supports L2 gateway translation between virtual and physical networks.
> We want to leverage the current L2-Gateway sub project in stack forge [6]
> and use it
> to enable configuration of L2 gateways in OVN.
> I have looked briefly at the project and it seems the API's are good, but
> currently the
> implementation relay on RPC and agent implementation (where we would like
> to
> configure it using OVSDB) , so this needs to be sorted and tested.

Last time I checked the progress of this project, they were focusing on ToR
VxLAN offload as a first use case. And, as far as I recall, this is what
networking-l2gw provides nowaday (Armando and Sukdev might have more info).
Nevertheless, the API is generic enough that in my opinion it might be
possible for OVN to leverage it. We shall implement a distinct l2gw service
plugin like [1]; as I have some familiarity with this kind of APIs, let me
know if I can be of any help.


> Another issue is related to OVN it self which doesn't have L2 Gateway
> awareness
> in the Northbound DB (which is the DB that neutron configure) but only has
> the API
> in the Southbound DB

Yeah, this could be some sort of a problem... I don't think Neutron should
interact with SB DB. OVN architecture has not been conceived to work this

> *7. QoS Support*
> We want to be able to support the new QoS API that is being implemented in
> Liberty [7]
> Need to see how we can leverage the work that will implement this for OVS
> in the
> reference implementation and what additions need to be made for OVN case.

Do you already have anything in mind?


> *8. L3 Implementation*
> L3 is not yet implemented in OVN, need to follow up on the design and add
> the L3 service plugin
> and implementation.

If I can be of any help on this front, I'd be glad to offer my assistance
(which may of no use for you, but that's another story!)
By the way, is there a reason for which native OVN DHCP/metadata access
support are not in this todo list?


> *9. VLAN Aware VM's*
> This is not directly related to OVN, but we need to see that OVN use case
> of configuring parent
> ports (for the use case of Containers inside a VM) is being addressed, and
> if the implementation
> is finished, to align the API for OVN as well.

I reckon the proposed API (master/child ports) or the alternative concept
of trunk ports both map fairly well on the data structures so far
implemented in OVN NB Database.
>From what I gather that mechanism, even if conceived for containers running
in VMs, can also be used for NFV enabling through OVN, assuming that is
even something OVN needs to care about.

> As i mentioned above, if you are interested in working on any of these
> items please email me
> or Russell back and we can get you started!
> Thanks
> Gal.
> [1] https://etherpad.openstack.org/p/neutron-liberty-mid-cycle
> [2]
> https://github.com/stackforge/networking-ovn/blob/master/doc/source/design/data_model.rst
> [3] http://openvswitch.org/pipermail/dev/2015-June/056212.html
> [4] https://review.openstack.org/#/c/186894/
> [5] https://github.com/stackforge/networking-ovs-dpdk
> [6] https://github.com/stackforge/networking-l2gw
> [7] https://review.openstack.org/#/c/182349/
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