Integration With Off-path Network Backends

Registered by Dmitrii Shcherbakov

Off-path SmartNICs (or DPUs) introduce an architecture change where network agents responsible for eSwitch configuration and representor interface plugging run on a separate SoC with its own CPU, memory and that runs a separate OS kernel. The side-effect of that is that hypervisor hostnames no longer match SmartNIC (DPU) hostnames which are seen by OVS and OVN agents while the existing port binding code relies on that. The goal of this specification is to introduce changes necessary to extend the existing hardware offload code to cope with the hostname mismatch and related design challenges while reusing the rest of the code. To do that, PCI(e) add-in card tracking is introduced for boards with unique serial numbers so that it can be used to determine the correct hostname of a SmartNIC on which networking agents will program the necessary flows and do the necessary port plugging. Additionally, more information is suggested to be passed in the "binding:profile" during a port update to facilitate representor port plugging.

Blueprint information

Status:
Started
Approver:
sean mooney
Priority:
Medium
Drafter:
Dmitrii Shcherbakov
Direction:
Approved
Assignee:
Dmitrii Shcherbakov
Definition:
Approved
Series goal:
Accepted for yoga
Implementation:
Good progress
Milestone target:
None
Started by
Dmitrii Shcherbakov

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.opendev.org/#/q/topic:integration-with-off-path-network-backends

Addressed by: https://review.opendev.org/c/openstack/nova-specs/+/787458
    Integration With Off-path Network Backends

[yoga] Add PCI VPD Capability Handling
https://review.opendev.org/c/openstack/nova/+/808199

[yoga] Support remote-managed SmartNIC DPU ports
https://review.opendev.org/c/openstack/nova/+/812111/

The os-traits change to add COMPUTE_REMOTE_MANAGED_PORTS
https://review.opendev.org/c/openstack/os-traits/+/818514

[20211117 bauzas] Spec was approved

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Work Items

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