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OVN To-do List

  • Refactor ovn-northd code to have separate functions to add logical flows for gateway logical routers and logical routers with distributed gateway port.

  • VLAN trunk ports.

    Russell Bryant: "Today that would require creating 4096 ports for the VM and attach to 4096 OVN networks, so doable, but not quite ideal."

  • Service function chaining.

  • Hitless upgrade, especially for data plane.

  • Dynamic IP to MAC binding enhancements.

    OVN has basic support for establishing IP to MAC bindings dynamically, using ARP.

    • Table size limiting.

      The table of MAC bindings must not be allowed to grow unreasonably large.

  • MTU handling (fragmentation on output)

  • Support multiple tunnel encapsulations in Chassis.

    So far, both ovn-controller and ovn-controller-vtep only allow chassis to have one tunnel encapsulation entry. We should extend the implementation to support multiple tunnel encapsulations.

  • Update learned MAC addresses from VTEP to OVN

    The VTEP gateway stores all MAC addresses learned from its physical interfaces in the 'Ucast_Macs_Local' and the 'Mcast_Macs_Local' tables. ovn-controller-vtep should be able to update that information back to ovn-sb database, so that other chassis know where to send packets destined to the extended external network instead of broadcasting.

  • Translate ovn-sb Multicast_Group table into VTEP config

    The ovn-controller-vtep daemon should be able to translate the Multicast_Group table entry in ovn-sb database into Mcast_Macs_Remote table configuration in VTEP database.

  • OVN OCF pacemaker script to support Active / Passive HA for OVN dbs provides the option to configure the inactivity_probe value. The default 5 seconds inactivity_probe value is not sufficient and ovsdb-server drops the client IDL connections for openstack deployments when the neutron server is heavily loaded.

    We need to find a proper solution to solve this issue instead of increasing the inactivity_probe value.

  • ACL

    • Support FTP ALGs.

  • OVN Interconnection

    • Packaging for Debian.

  • IP Multicast Relay

    • When connecting bridged logical switches (localnet) to logical routers with IP Multicast Relay enabled packets might get duplicated. We need to find a way of determining if routing has already been executed (on a different hypervisor) for the IP multicast packet being processed locally in the router pipeline.

  • ovn-controller Incremental processing

    • Implement I-P for datapath groups.

  • ovn-northd parallel logical flow processing

    • Multi-threaded logical flow computation was optimized for the case when datapath groups are disabled. Datpath groups are always enabled now so northd parallel processing should be revisited.

  • ovn-controller daemon module

    • Dumitru Ceara: Add a new module e.g. ovn/lib/daemon-ovn.c that wraps OVS' daemonize_start() call and initializes the additional things, like the unixctl commands. Or, we should move the APIs such as daemon_started_recently() to OVS's lib/daemon.

  • Chassis_Template_Var

    • Support template variables when tracing packets with ovn-trace.

  • Load Balancer templates

    • Support combining the VIP IP and port into a single template variable.

  • ovn-controller conditional monitoring

    • Improve sub-ports (with parent_port set) conditional monitoring; these are currently unconditionally monitored, even if ovn-monitor-all is set to false.

  • ovn-northd parallel build

    • Move the lflow build parallel processing from northd.c to lflow-mgr.c This would also ensure that the variables declared in northd.c (eg. thread_lflow_counter) are not externed in lflow-mgr.c.

  • Remove flows with check_pkt_larger when userspace datapath can handle PMTUD. (https://issues.redhat.com/browse/FDP-256)