openstack
/
nova
Code Issues Proposed changes

Ensure MAC addresses characters are in the same case 

Currently neutron can report ports to have MAC addresses
in upper case when they're created like that. In the meanwhile
libvirt configuration file always stores MAC in lower case
which leads to KeyError while trying to retrieve migrate_vif.

Closes-Bug: #1945646
Change-Id: Ie3129ee395427337e9abcef2f938012608f643e1
This commit is contained in:
Dmitriy Rabotyagov 2021-09-30 14:08:38 +03:00
parent fdfdba2658
commit 6a15169ed9
2 changed files with 51 additions and 3 deletions
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43
nova/tests/unit/virt/libvirt/test_migration.py
View File

@ -949,7 +949,48 @@ class UtilityMigrationTestCase(test.NoDBTestCase):
doc = etree.fromstring(original_xml)
ex = self.assertRaises(KeyError, migration._update_vif_xml,
doc, data, get_vif_config)
self.assertIn("CA:FE:DE:AD:BE:EF", str(ex))
self.assertIn("ca:fe:de:ad:be:ef", str(ex))
def test_update_vif_xml_lower_case_mac(self):
"""Tests that the vif in the migrate data is not found in the existing
guest interfaces.
"""
conf = vconfig.LibvirtConfigGuestInterface()
conf.net_type = "bridge"
conf.source_dev = "qbra188171c-ea"
conf.target_dev = "tapa188171c-ea"
conf.mac_addr = "DE:AD:BE:EF:CA:FE"
conf.model = "virtio"
original_xml = """<domain>
<uuid>3de6550a-8596-4937-8046-9d862036bca5</uuid>
<devices>
<interface type="bridge">
<mac address="de:ad:be:ef:ca:fe"/>
<model type="virtio"/>
<source bridge="qbra188171c-ea"/>
<target dev="tapa188171c-ea"/>
<virtualport type="openvswitch">
<parameters interfaceid="%s"/>
</virtualport>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</interface>
</devices>
</domain>""" % uuids.ovs
expected_xml = """<domain>
<uuid>3de6550a-8596-4937-8046-9d862036bca5</uuid>
<devices>
<interface type="bridge">
<mac address="DE:AD:BE:EF:CA:FE"/>
<model type="virtio"/>
<source bridge="qbra188171c-ea"/>
<target dev="tapa188171c-ea"/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</interface>
</devices>
</domain>"""
self._test_update_vif_xml(conf, original_xml, expected_xml)
class MigrationMonitorTestCase(test.NoDBTestCase):

11
nova/virt/libvirt/migration.py
View File

@ -339,14 +339,21 @@ def _update_vif_xml(xml_doc, migrate_data, get_vif_config):
instance_uuid = xml_doc.findtext('uuid')
parser = etree.XMLParser(remove_blank_text=True)
interface_nodes = xml_doc.findall('./devices/interface')
migrate_vif_by_mac = {vif.source_vif['address']: vif
# MAC address stored for port in neutron DB and in domain XML
# might be in different cases, so to harmonize that
# we convert MAC to lower case for dict key.
migrate_vif_by_mac = {vif.source_vif['address'].lower(): vif
for vif in migrate_data.vifs}
for interface_dev in interface_nodes:
mac = interface_dev.find('mac')
mac = mac if mac is not None else {}
mac_addr = mac.get('address')
if mac_addr:
migrate_vif = migrate_vif_by_mac[mac_addr]
# MAC address stored in libvirt should always be normalized
# and stored in lower case. But just to be extra safe here
# we still normalize MAC retrieved from XML to be absolutely
# sure it will be the same with the Neutron provided one.
migrate_vif = migrate_vif_by_mac[mac_addr.lower()]
vif = migrate_vif.get_dest_vif()
# get_vif_config is a partial function of
# nova.virt.libvirt.vif.LibvirtGenericVIFDriver.get_config