neutron/releasenotes/notes/vhost-vdpa-4597a27de6232350.yaml
Sean Mooney ae22fe4495 Add support for VNIC type vDPA to ML2/OVS and ML2/OVN
This change adds VNIC type vDPA ("vdpa") to the list of
supported VNIC types for the OVS and OVN mech drivers.

Depends-On: https://review.opendev.org/#/c/760043/
Change-Id: If22aedc147f7e2256f8f8ad3bebb80b6bb2f6d3d
2021-02-17 08:37:12 +00:00

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YAML

---
features:
- |
A new vnic type ``vdpa`` has been added to allow requesting port that
utilize a vHost-vDPA offload. The ML2/OVS and ML2/OVN mech drivers now
have support for the vHost-vDPA vnic type. vHost-vDPA is similar to
vHost-user or kernel vhost offload but utilizes the newly added vDPA bus
introduced in the Linux 5.7 kernel. vDPA interface can be implemented in
software or hardware, when implemented in hardware they provide equivalent
performance to SR-IOV or hardware offloaded OVS while providing two main
advantages over both SR-IOV and hardware offloaded OVS. Unlike the
alternatives, vHost-vDPA enables live migration of instance transparently
and provides a standard virtio-net interface to the guest avoiding the
need to install vendor specific drivers in the guest.