Can't update MAC address for direct-physical ports

Bug #1617452 reported by Ludovic Beliveau on 2016-08-26
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

This bug also affect nova and is described in details there:

Nova needs to be fixed in order to update the MAC address of the neutron ports of type direct-physical.

A fix has been proposed for the nova issue. However, sending a MAC address update to neutron-server reports the following error:

Unable to complete operation on port d19c4cef-7415-4113-ba92-2495f00384d2, port is already bound, port type: hostdev_physical, old_mac 90:e2:ba:48:27:ed, new_mac 00:1e:67:51:36:71.


Booting a guest with a neutron port of type 'direct-physical' will cause nova to allocate a PCI passthrough device for the port. The MAC address of the PCI passthrough device in the guest is not a virtual MAC address (fa:16:...) but the MAC address of the physical device since the full device is allocated to the guest (compared to SR-IOV where a virtual MAC address is arbitrarily chosen for the port).

When resizing the guest (to another flavor), nova will allocate a new PCI device for the guest. After the resize, the guest will be bound to another PCI device which has a different MAC address. However the MAC address on the neutron port is not updated, causing DHCP to not work because the MAC address is unknown.

The same issue can be observed when migrating a guest to another host.

description: updated

Fix proposed to branch: master

Changed in neutron:
assignee: nobody → Ludovic Beliveau (ludovic-beliveau)
status: New → In Progress
Changed in neutron:
importance: Undecided → Medium

Change abandoned by Armando Migliaccio (<email address hidden>) on branch: master
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

Changed in neutron:
status: In Progress → Incomplete
assignee: Ludovic Beliveau (ludovic-beliveau) → nobody
tags: added: low-hanging-fruit
tags: added: sriov-pci-pt
Changed in neutron:
assignee: nobody → Manikanta Pendela (pendelamani)
Changed in neutron:
status: Incomplete → New
status: New → Incomplete
status: Incomplete → Opinion
status: Opinion → New
assignee: Manikanta Pendela (pendelamani) → nobody
Changed in neutron:
status: New → Confirmed
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