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How does passthrough of a networking device work with Neutron?

asked 2013-10-09 08:19:56 -0500

sgordon gravatar image

updated 2013-10-09 08:26:24 -0500

In Havana the Compute (Nova) service has added support for PCI Passthrough [1][2]. I've found some documentation of this feature on the wiki [3] but it's unclear to me what happens if I use the passthrough functionality to expose a physical networking device to guests (or more specifically a single SR-IOV supporting networking device to multiple guests).

Is Neutron still able to handle the networking for these guests and if so how does it need to be configured? If the answer is no and you are reliant on manual configuration plus physical networking topography, is this able to co-exist with other virtual interfaces attached to the same guest that are managed by Neutron?

[1] https://blueprints.launchpad.net/nova/+spec/pci-passthrough-base

[2] https://blueprints.launchpad.net/nova/+spec/pci-passthrough-libvirt

[3] https://wiki.openstack.org/wiki/Pci_passthrough

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answered 2013-10-09 20:32:13 -0500

sgordon gravatar image

I followed up on the OpenStack mailing list and the current answer, at least with regards to Neutron, is that it doesn't deal with devices that have been passed through to the guest in this fashion at all. Discussions around how this might work are likely in the Icehouse time frame.

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Asked: 2013-10-09 08:19:56 -0500

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Last updated: Oct 09 '13