Add support for Napatech LinkVirt SmartNICs
Napatech LinkVirtualization SmartNICs offload network traffic switching, QoS, and tunnel encapsulation/decapsulation functions from the OVS running on the hypervisor to the on-board silicon. This patch updates the Nova source code to include support for a new VIF type corresponding to the virtual devices exposed by the LinkVirtualization SmartNIC. Change-Id: I2df34bbf4031384e008cbc642ca15291501dfe53
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Justas Poderys
Danylo Vodopianov
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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=============================================
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Support Napatech LinkVirtualization SmartNICs
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=============================================
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https://blueprints.launchpad.net/nova/+spec/support-napatech-linkvirtualization-smartnic
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Napatech LinkVirtualization SmartNICs offload network traffic switching, QoS,
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and tunnel encapsulation/decapsulation functions from the OVS running on the
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hypervisor to the on-board silicon. This patch updates the Nova source code to
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include support for a new VIF type corresponding to the virtual devices exposed
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by the LinkVirtualization SmartNIC.
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Problem description
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===================
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Napatech SmartNICs can offload several computational resource intensive tasks
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from the hypervisor, such as packet switching, QoS enforcement, and V(x)LAN
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tunnel encapsulation/decapsulation. Upstream and Out of tree OVS
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implementations can leverage these offloads when using dpdk via DPDK port
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representors (https://docs.openvswitch.org/en/latest/topics/dpdk/phy/#representors).
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Nova and os-vif currently support kernel-based VF representors, but not the
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DPDK VF representors which leverage vhost-user socket. This spec seeks to
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address this gap.
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Use Cases
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---------
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* An end user of Napatech SmartNIC should be able to support Napatech SmartNICs
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out-of-the-box.
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* Other SmartNICs using OvS-DPDK representor ports should also work.
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Proposed change
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===============
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* We propose to extend the OpenvSwitch driver with a new VNIC type
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`VNIC_VIRTIO_FORWARDER` and the related VIF handling function
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`nova_to_osvif_vif()`. A method which handles vhostuser VIF type should
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handle the new VNIC type by setting an appropriate datapath, representor port
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profile, vhostuser vif type, `OVS` plugin, and datapath offload settings.
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OpenvSwitch driver should be able to set the DPDK representor socket path for
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virtio-forwarder vnic type:
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https://docs.openvswitch.org/en/latest/topics/dpdk/phy/#representors.
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* We propose to extend `OVS_DPDK_PORT_TYPES` with a new port type `dpdk`.
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* We propose to update the `OvsPlugin` class to support plug and unplug of OVS
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DPDK representor ports.
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* We propose unit-tests pertinent to the proposed changes.
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Alternatives
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------------
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None
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Data model impact
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-----------------
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None
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REST API impact
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---------------
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None
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Security impact
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---------------
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None
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Notifications impact
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--------------------
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None
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Other end user impact
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---------------------
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None
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Performance Impact
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------------------
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Users will see a significant network performance increase when running over
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the hardware offloaded data-plane compared kernel-ovs and traditional
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vhost-user.
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Other deployer impact
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---------------------
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In line with other SmartNIC offerings, the deployer will have to configure
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OVS-DPDK following the SmartNIC producer guidelines and update the PCI
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device_spec configuration.
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https://docs.openstack.org/nova/latest/configuration/config.html#pci.device_spec
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Developer impact
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----------------
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None
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Upgrade impact
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--------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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* Oleksii Butenko (obu-plv)
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* Danylo Vodopianov (dvo-plv)
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* Justas Poderys (justas_napa on IRC and Gerrit)
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Feature Liaison
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---------------
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* Sean Mooney (sean-k-mooney)
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Work Items
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----------
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* Nova change proposal:
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https://review.opendev.org/c/openstack/nova/+/859577
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* Os-vif change proposal:
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https://review.opendev.org/c/openstack/os-vif/+/859574
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* Neutron-lib change proposal:
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https://review.opendev.org/c/openstack/neutron-lib/+/859573
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* Neutron change proposal:
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https://review.opendev.org/c/openstack/neutron/+/869510
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Dependencies
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============
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* This blueprint is a prerequisite to update code in Neutron to support
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LinkVirtualization SmartNICs. This is in-line with support of other
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SmartNICs. Links to changes of all four components are given in the Work
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Items section.
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Testing
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=======
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* Code changes will require additional testing coverage:
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New unit tests will be implented ot updated existing.
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New functional tests will be implemented.
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Napatech will provide third party ci for testing on the NT hardware.
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Documentation Impact
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====================
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We are not introducing any new VNIC type, so there should be no impact on
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documentation.
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References
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==========
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* Napatech LinkVirtualization:
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https://www.napatech.com/products/link-virtualization-software/
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History
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=======
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.. list-table:: Revisions
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:header-rows: 1
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* - Release Name
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- Description
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* - 2023.2 Bobcat
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- Introduced
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