[RFE] DVR Enhancements

[Ryan Tidwell]

This involves the following items:

- Support for distributed ingress and egress for IPv6
- Support for running without network nodes. This implies
  * Support for distributed DHCP
  * Support for distributed SNAT
- Ensuring an OpenFlow-based DVR implementation is written in a way that can be offloaded to a smart-NIC as hardware support comes online.

Due to the broad nature of these changes, I will propose a spec in neutron-specs to elaborate on these items.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/658414

[Swaminathan Vasudevan (swaminathan-vasudevan)]

Ryan can we split this into multiple RFEs.

[Ryan Tidwell (ryan-tidwell)]

We can. I went this route because the discussion at the PTG ended with an action item to create a spec.

[Miguel Lavalle (minsel)]

This RFE was discussed during the Neutron drivers meeting. It was approved as a "directional RFE", meaning that it sets a general direction over several cycles that will spawn several smaller efforts. There are three major goals to be achieved:

1) Rid Neutron of the concept of "network nodes"

2) Take advantage of smart NIC offloading for L3 functions

3) Improvement of the rpc channel performance

Next steps are:

1) Ryan Tidwell to spell out its entire vision in the associated spec

2) Based on point 1, make a gap analysis in the reference implementation and OVN and make a plan on how to "meet in the middle"

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/658414
Committed: https://git.openstack.org/cgit/openstack/neutron-specs/commit/?id=796309e571dcffc86b75ac9ab405904cc7c0c9bb
Submitter: Zuul
Branch: master

commit 796309e571dcffc86b75ac9ab405904cc7c0c9bb
Author: Ryan Tidwell <email address hidden>
Date: Fri May 10 11:22:01 2019 -0500

    Toward Convergence of ML2+OVS+DVR and OVN

    This spec outlines the rationale, justification, and plans for
    OVN and ML2+OVS+DVR convergence in neutron.

    Change-Id: I82a2bae8c250e6a5749450131c0d602b134fb3a4
    Related-Bug: #1828607