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Update pci stat pools based on PCI device changes

At start up of nova-compute service, the PCI stat pools are
populated based on information in pci_devices table in Nova
database. The pools are updated only when new device is added
or removed but not on any device changes like device type.

If an existing device is configured as SRIOV and nova-compute
is restarted, the pci_devices table gets updated but the device
is still listed under the old pool in pci_tracker.stats.pool
(in-memory object).

This patch looks for device type updates in existing devices
and updates the pools accordingly.

Conflicts:
      nova/tests/functional/libvirt/test_pci_sriov_servers.py

To avoid the conflicts and make the new functional test execute,
following changes are performed in the new test case
- Passing hostname as argument to self._get_connection() is not
  supported in stable/stein and hence dropped the argument.
- Compute nodes cannot be retreived by host and nodename should
  also be included in stable/stein. So modified the function call
  to use objects.ComputeNode.get_by_host_and_nodename instead.

Change-Id: Id4ebb06e634a612c8be4be6c678d8265e0b99730
Closes-Bug: #1892361
(cherry picked from commit b8695de6da)
(cherry picked from commit d8b8a8193b)
(cherry picked from commit f58399cf49)
(cherry picked from commit 8378785f99)
changes/27/761727/4
Hemanth Nakkina 1 year ago
parent
commit
73e631862a
  1. 1
      nova/pci/manager.py
  2. 26
      nova/pci/stats.py
  3. 78
      nova/tests/functional/libvirt/test_pci_sriov_servers.py
  4. 24
      nova/tests/unit/pci/test_stats.py
  5. 112
      nova/tests/unit/virt/libvirt/fakelibvirt.py
  6. 12
      releasenotes/notes/bug-1892361-pci-deivce-type-update-c407a66fd37f6405.yaml

1
nova/pci/manager.py

@ -225,6 +225,7 @@ class PciDevTracker(object):
self.stale[new_value['address']] = new_value
else:
existed.update_device(new_value)
self.stats.update_device(existed)
# Track newly discovered devices.
for dev in [dev for dev in devices if

26
nova/pci/stats.py

@ -105,6 +105,32 @@ class PciDeviceStats(object):
pool['parent_ifname'] = dev.extra_info['parent_ifname']
return pool
def _get_pool_with_device_type_mismatch(self, dev):
"""Check for device type mismatch in the pools for a given device.
Return (pool, device) if device type does not match or a single None
if the device type matches.
"""
for pool in self.pools:
for device in pool['devices']:
if device.address == dev.address:
if dev.dev_type != pool["dev_type"]:
return pool, device
return None
return None
def update_device(self, dev):
"""Update a device to its matching pool."""
pool_device_info = self._get_pool_with_device_type_mismatch(dev)
if pool_device_info is None:
return
pool, device = pool_device_info
pool['devices'].remove(device)
self._decrease_pool_count(self.pools, pool)
self.add_device(dev)
def add_device(self, dev):
"""Add a device to its matching pool."""
dev_pool = self._create_pool_keys_from_dev(dev)

78
nova/tests/functional/libvirt/test_pci_sriov_servers.py

@ -13,11 +13,14 @@
# License for the specific language governing permissions and limitations
# under the License.
import copy
import mock
from oslo_config import cfg
from oslo_log import log as logging
from oslo_serialization import jsonutils
from nova import context
from nova import objects
from nova.objects import fields
from nova.tests.functional.libvirt import base
from nova.tests.unit.virt.libvirt import fakelibvirt
@ -126,6 +129,20 @@ class SRIOVServersTest(_PCIServersTestBase):
},
)]
def _disable_sriov_in_pf(self, pci_info):
# Check for PF and change the capability from virt_functions
# Delete all the VFs
vfs_to_delete = []
for device_name, device in pci_info.devices.items():
if 'virt_functions' in device.pci_device:
device.generate_xml(skip_capability=True)
elif 'phys_function' in device.pci_device:
vfs_to_delete.append(device_name)
for device in vfs_to_delete:
del pci_info.devices[device]
@mock.patch('nova.virt.libvirt.LibvirtDriver._create_image',
return_value=(False, False))
def test_create_server_with_VF(self, img_mock):
@ -204,6 +221,67 @@ class SRIOVServersTest(_PCIServersTestBase):
self._run_build_test(flavor_id_vfs)
self._run_build_test(flavor_id_pfs, end_status='ERROR')
def test_create_server_after_change_in_nonsriov_pf_to_sriov_pf(self):
# Starts a compute with PF not configured with SRIOV capabilities
# Updates the PF with SRIOV capability and restart the compute service
# Then starts a VM with the sriov port. The VM should be in active
# state with sriov port attached.
# To emulate the device type changing, we first create a
# HostPCIDevicesInfo object with PFs and VFs. Then we make a copy
# and remove the VFs and the virt_function capability. This is
# done to ensure the physical function product id is same in both
# the versions.
host_info = fakelibvirt.HostInfo(cpu_nodes=2, cpu_sockets=1,
cpu_cores=2, cpu_threads=2,
kB_mem=15740000)
pci_info = fakelibvirt.HostPCIDevicesInfo(num_pfs=1, num_vfs=1)
pci_info_no_sriov = copy.deepcopy(pci_info)
# Disable SRIOV capabilties in PF and delete the VFs
self._disable_sriov_in_pf(pci_info_no_sriov)
fake_connection = self._get_connection(host_info,
pci_info=pci_info_no_sriov)
self.mock_conn.return_value = fake_connection
self.compute = self.start_service('compute', host='test_compute0')
ctxt = context.get_admin_context()
pci_devices = objects.PciDeviceList.get_by_compute_node(
ctxt,
objects.ComputeNode.get_by_host_and_nodename(
ctxt, 'test_compute0', 'compute1'
).id,
)
self.assertEqual(1, len(pci_devices))
self.assertEqual('type-PCI', pci_devices[0].dev_type)
# Update connection with original pci info with sriov PFs
fake_connection = self._get_connection(host_info,
pci_info=pci_info)
self.mock_conn.return_value = fake_connection
# Restart the compute service
self.restart_compute_service(self.compute)
self.compute_started = True
# Verify if PCI devices are of type type-PF or type-VF
pci_devices = objects.PciDeviceList.get_by_compute_node(
ctxt,
objects.ComputeNode.get_by_host_and_nodename(
ctxt, 'test_compute0', 'compute1'
).id,
)
for pci_device in pci_devices:
self.assertIn(pci_device.dev_type, ['type-PF', 'type-VF'])
# Create a flavor
extra_spec = {"pci_passthrough:alias": "%s:1" % self.VFS_ALIAS_NAME}
flavor_id = self._create_flavor(extra_spec=extra_spec)
self._run_build_test(flavor_id)
class GetServerDiagnosticsServerWithVfTestV21(_PCIServersTestBase):

24
nova/tests/unit/pci/test_stats.py

@ -533,6 +533,30 @@ class PciDeviceStatsWithTagsTestCase(test.NoDBTestCase):
self.pci_stats.remove_device(dev2)
self._assertPools()
def test_update_device(self):
# Update device type of one of the device from type-PCI to
# type-PF. Verify if the existing pool is updated and a new
# pool is created with dev_type type-PF.
self._create_pci_devices()
dev1 = self.pci_tagged_devices.pop()
dev1.dev_type = 'type-PF'
self.pci_stats.update_device(dev1)
self.assertEqual(3, len(self.pci_stats.pools))
self._assertPoolContent(self.pci_stats.pools[0], '1137', '0072',
len(self.pci_untagged_devices))
self.assertEqual(self.pci_untagged_devices,
self.pci_stats.pools[0]['devices'])
self._assertPoolContent(self.pci_stats.pools[1], '1137', '0071',
len(self.pci_tagged_devices),
physical_network='physnet1')
self.assertEqual(self.pci_tagged_devices,
self.pci_stats.pools[1]['devices'])
self._assertPoolContent(self.pci_stats.pools[2], '1137', '0071',
1,
physical_network='physnet1')
self.assertEqual(dev1,
self.pci_stats.pools[2]['devices'][0])
class PciDeviceVFPFStatsTestCase(test.NoDBTestCase):

112
nova/tests/unit/virt/libvirt/fakelibvirt.py

@ -249,60 +249,71 @@ class FakePCIDevice(object):
applicable if ``dev_type`` is one of: ``PF``, ``VF``.
"""
if dev_type == 'PCI':
if vf_ratio:
self.dev_type = dev_type
self.slot = slot
self.function = function
self.iommu_group = iommu_group
self.numa_node = numa_node
self.vf_ratio = vf_ratio
self.generate_xml()
def generate_xml(self, skip_capability=False):
capability = ''
if self.dev_type == 'PCI':
if self.vf_ratio:
raise ValueError('vf_ratio does not apply for PCI devices')
prod_id = PCI_PROD_ID
prod_name = PCI_PROD_NAME
driver = PCI_DRIVER_NAME
capability = ''
elif dev_type == 'PF':
elif self.dev_type == 'PF':
prod_id = PF_PROD_ID
prod_name = PF_PROD_NAME
driver = PF_DRIVER_NAME
capability = self.cap_templ % {
'cap_type': PF_CAP_TYPE,
'addresses': '\n'.join([
self.addr_templ % {
# these are the slot, function values of the child VFs
# we can only assign 8 functions to a slot (0-7) so
# bump the slot each time we exceed this
'slot': slot + (x // 8),
# ...and wrap the function value
'function': x % 8,
# the offset is because the PF is occupying function 0
} for x in range(1, vf_ratio + 1)])
}
elif dev_type == 'VF':
if not skip_capability:
capability = self.cap_templ % {
'cap_type': PF_CAP_TYPE,
'addresses': '\n'.join([
self.addr_templ % {
# these are the slot, function values of the child
# VFs, we can only assign 8 functions to a slot
# (0-7) so bump the slot each time we exceed this
'slot': self.slot + (x // 8),
# ...and wrap the function value
'function': x % 8,
# the offset is because the PF is occupying function 0
} for x in range(1, self.vf_ratio + 1)])
}
elif self.dev_type == 'VF':
prod_id = VF_PROD_ID
prod_name = VF_PROD_NAME
driver = VF_DRIVER_NAME
capability = self.cap_templ % {
'cap_type': VF_CAP_TYPE,
'addresses': self.addr_templ % {
# this is the slot, function value of the parent PF
# if we're e.g. device 8, we'll have a different slot
# to our parent so reverse this
'slot': slot - ((vf_ratio + 1) // 8),
# the parent PF is always function 0
'function': 0,
if not skip_capability:
capability = self.cap_templ % {
'cap_type': VF_CAP_TYPE,
'addresses': self.addr_templ % {
# this is the slot, function value of the parent PF
# if we're e.g. device 8, we'll have a different slot
# to our parent so reverse this
'slot': self.slot - ((self.vf_ratio + 1) // 8),
# the parent PF is always function 0
'function': 0,
}
}
}
else:
raise ValueError('Expected one of: PCI, VF, PCI')
self.pci_device = self.pci_device_template % {
'slot': slot,
'function': function,
'slot': self.slot,
'function': self.function,
'vend_id': PCI_VEND_ID,
'vend_name': PCI_VEND_NAME,
'prod_id': prod_id,
'prod_name': prod_name,
'driver': driver,
'capability': capability,
'iommu_group': iommu_group,
'numa_node': numa_node,
'iommu_group': self.iommu_group,
'numa_node': self.numa_node,
}
def XMLDesc(self, flags):
@ -873,6 +884,20 @@ class Domain(object):
nic_info['source'] = source.get('network')
elif nic_info['type'] == 'bridge':
nic_info['source'] = source.get('bridge')
elif nic_info['type'] == 'hostdev':
# <interface type='hostdev'> is for VF when vnic_type
# is direct. Add sriov vf pci information in nic_info
address = source.find('./address')
pci_type = address.get('type')
pci_domain = address.get('domain').replace('0x', '')
pci_bus = address.get('bus').replace('0x', '')
pci_slot = address.get('slot').replace('0x', '')
pci_function = address.get('function').replace(
'0x', '')
pci_device = "%s_%s_%s_%s_%s" % (pci_type, pci_domain,
pci_bus, pci_slot,
pci_function)
nic_info['source'] = pci_device
nics_info += [nic_info]
@ -896,11 +921,32 @@ class Domain(object):
return definition
def verify_hostdevs_interface_are_vfs(self):
"""Verify for interface type hostdev if the pci device is VF or not.
"""
error_message = ("Interface type hostdev is currently supported on "
"SR-IOV Virtual Functions only")
nics = self._def['devices'].get('nics', [])
for nic in nics:
if nic['type'] == 'hostdev':
pci_device = nic['source']
pci_info_from_connection = self._connection.pci_info.devices[
pci_device]
if 'phys_function' not in pci_info_from_connection.pci_device:
raise make_libvirtError(
libvirtError,
error_message,
error_code=VIR_ERR_CONFIG_UNSUPPORTED,
error_domain=VIR_FROM_DOMAIN)
def create(self):
self.createWithFlags(0)
def createWithFlags(self, flags):
# FIXME: Not handling flags at the moment
self.verify_hostdevs_interface_are_vfs()
self._state = VIR_DOMAIN_RUNNING
self._connection._mark_running(self)
self._has_saved_state = False
@ -1024,7 +1070,7 @@ class Domain(object):
nics = ''
for nic in self._def['devices']['nics']:
if 'source' in nic:
if 'source' in nic and nic['type'] != 'hostdev':
nics += '''<interface type='%(type)s'>
<mac address='%(mac)s'/>
<source %(type)s='%(source)s'/>

12
releasenotes/notes/bug-1892361-pci-deivce-type-update-c407a66fd37f6405.yaml

@ -0,0 +1,12 @@
---
fixes:
- |
Fixes `bug 1892361`_ in which the pci stat pools are not updated when an
existing device is enabled with SRIOV capability. Restart of nova-compute
service updates the pci device type from type-PCI to type-PF but the pools
still maintain the device type as type-PCI. And so the PF is considered for
allocation to instance that requests vnic_type=direct. With this fix, the
pci device type updates are detected and the pci stat pools are updated
properly.
.. _bug 1892361: https://bugs.launchpad.net/nova/+bug/1892361
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