** Also affects: mos
Importance: Undecided
Status: New
** Changed in: mos
Milestone: None => 9.2-mu-3
** Changed in: mos
Assignee: (unassigned) => Oleg Bondarev (obondarev)
** Changed in: mos
Importance: Undecided => Medium
** Changed in: mos
Status: New => In Progress
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Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1702635
Title:
SR-IOV: sometimes a port may hang in BUILD state
Status in Mirantis OpenStack:
In Progress
Status in neutron:
In Progress
Bug description:
Scenario:
1) vfio-pci driver is used for VFs
2) 2 ports are created in neutron with binding type 'direct'
3) VMs are spawned and deleted on 2 compute nodes using pre-created ports
4) one neutron port may be bound to different compute nodes at different
moments
5) for some reason (probably a bug, but current bug is not about it)
vfio-pci is not properly handling VF reset after VM deletion and for
sriov agent it looks like some port's MAC is still mapped to some PCI
slot though the port is not bound to the node
6) sriov agent requests port info from server with
get_devices_details_list() but doesn't specify 'host' in parameters
7) in this case neutron server sets this port to BUILD, though it may be
bound to another host:
def _get_new_status(self, host, port_context):
port = port_context.current
if not host or host == port_context.host:
new_status = (n_const.PORT_STATUS_BUILD if port['admin_state_up']
else n_const.PORT_STATUS_DOWN)
if port['status'] != new_status:
return new_status
8) after processing, the agent notifies server with update_device_list() and
this time specifies 'host' parameter
9) server detects port's and agent's host mismatch and doesn't update status
of the port
10) port stays in BUILD state
A simple fix would be to specify host at step 6 - in this case neutron
server won't set port's status to BUILD because of host mismatch.
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