NEC driver: fix live-migration failure with FC

The initialize_connection() in the driver sometimes returns wrong LUN
and causes a live-migration failure.
The function searches the LUN from LD sets (attached hosts) and returns
the first hit.
The function must return an LUN of the destination host, but the first
hit may be an LUN of the source host.

This patch fixes initialize_connection() to return correct LUN by
searching with WWPN of the desitination host.

Change-Id: I102ae84204e0d88814a7d2e028f7cec118ad6b60
Closes-Bug: #1887908

cinder/tests/unit/volume/drivers/nec/test_volume.py

@@ -211,6 +211,17 @@ xml_out = '''
      <UNIT name="RPL Attribute">IV</UNIT>
     </SECTION>
    </OBJECT>
+   <OBJECT name="Logical Disk">
+    <SECTION name="LD Detail Information">
+     <UNIT name="LDN(h)">0011</UNIT>
+     <UNIT name="OS Type">LX</UNIT>
+     <UNIT name="LD Name">6EWPOChJkdSysJmpMAB9YR</UNIT>
+     <UNIT name="LD Capacity">6442450944</UNIT>
+     <UNIT name="Pool No.(h)">0001</UNIT>
+     <UNIT name="Purpose">---</UNIT>
+     <UNIT name="RPL Attribute">IV</UNIT>
+    </SECTION>
+   </OBJECT>
    <OBJECT name="Logical Disk">
     <SECTION name="LD Detail Information">
      <UNIT name="LDN(h)">0fff</UNIT>
@@ -331,6 +342,26 @@ xml_out = '''
      <UNIT name="LUN(h)">0001</UNIT>
      <UNIT name="LDN(h)">0006</UNIT>
     </SECTION>
+    <SECTION name="LUN/LD List">
+     <UNIT name="LUN(h)">0002</UNIT>
+     <UNIT name="LDN(h)">0011</UNIT>
+    </SECTION>
+   </OBJECT>
+   <OBJECT name="LD Set(FC)">
+    <SECTION name="LD Set(FC) Information">
+     <UNIT name="Platform">LX</UNIT>
+     <UNIT name="LD Set Name">OpenStack3</UNIT>
+    </SECTION>
+    <SECTION name="Path List">
+     <UNIT name="Path">1000-0090-FAA0-786D</UNIT>
+    </SECTION>
+    <SECTION name="Path List">
+     <UNIT name="Path">1000-0090-FAA0-786C</UNIT>
+    </SECTION>
+    <SECTION name="LUN/LD List">
+     <UNIT name="LUN(h)">0001</UNIT>
+     <UNIT name="LDN(h)">0011</UNIT>
+    </SECTION>
    </OBJECT>
    <OBJECT name="LD Set(iSCSI)">
     <SECTION name="LD Set(iSCSI) Information">
@@ -1033,6 +1064,37 @@ class ExportTest(volume_helper.MStorageDSVDriver, test.TestCase):
             self._fc_terminate_connection(vol, connector)
             delldsetld_mock.assert_not_called()
 
+        vol = fake_volume_obj(ctx, id='ccd662e5-2efe-4899-b12f-114b5cad81c3')
+        connector = {'wwpns': ["10000090FAA0786A", "10000090FAA0786B"],
+                     'host': 'HostA'}
+        atchmnt = {
+            'id': constants.ATTACHMENT_ID,
+            'volume_id': vol.id,
+            'connector': connector
+        }
+        attach_object = volume_attachment.VolumeAttachment(**atchmnt)
+        attachment = volume_attachment.VolumeAttachmentList(
+            objects=[attach_object])
+        vol.volume_attachment = attachment
+
+        info = self._fc_initialize_connection(vol, connector)
+        self.assertEqual(2, info['data']['target_lun'])
+
+        connector = {'wwpns': ["10000090FAA0786C", "10000090FAA0786D"],
+                     'host': 'HostB'}
+        atchmnt = {
+            'id': constants.ATTACHMENT_ID,
+            'volume_id': vol.id,
+            'connector': connector
+        }
+        attach_object = volume_attachment.VolumeAttachment(**atchmnt)
+        attachment = volume_attachment.VolumeAttachmentList(
+            objects=[attach_object])
+        vol.volume_attachment = attachment
+
+        info = self._fc_initialize_connection(vol, connector)
+        self.assertEqual(1, info['data']['target_lun'])
+
     def test_fc_terminate_connection(self):
         ctx = context.RequestContext('admin', 'fake', True)
         vol = fake_volume_obj(ctx, id='46045673-41e7-44a7-9333-02f07feab04b')
@@ -1244,7 +1306,12 @@ class NonDisruptiveBackup_test(volume_helper.MStorageDSVDriver,
                       'protocol': 'FC',
                       'wwpn': ['1000-0090-FAA0-786A', '1000-0090-FAA0-786B'],
                       'port': []}
-        return_ldset = [ldset_lds0, ldset_lds1]
+        ldset_lds2 = {'ldsetname': 'LX:OpenStack1',
+                      'lds': {6: {'ldn': 6, 'lun': 1}},
+                      'protocol': 'FC',
+                      'wwpn': ['1000-0090-FAA0-786A', '1000-0090-FAA0-786B'],
+                      'port': []}
+        return_ldset = [ldset_lds0, ldset_lds1, ldset_lds2]
         self.mock_object(self, '_validate_fcldset_exist',
                          side_effect=return_ldset)
         mocker = self.mock_object(self._cli, 'addldsetld',

cinder/volume/drivers/nec/volume_helper.py

@@ -1275,15 +1275,11 @@ class MStorageDriver(volume_common.MStorageVolumeCommon):
         else:
             ldn = lds[ldname]['ldn']
 
-        lun = None
-        for ldset in ldsets.values():
-            if ldn in ldset['lds']:
-                lun = ldset['lds'][ldn]['lun']
-                break
+        ldset = self._validate_fcldset_exist(ldsets, connector)
 
         info = {
             'driver_volume_type': 'fibre_channel',
-            'data': {'target_lun': lun,
+            'data': {'target_lun': ldset['lds'][ldn]['lun'],
                      'target_wwn': target_wwns,
                      'initiator_target_map': init_targ_map}}
 

releasenotes/notes/bug-1887908-nec-live-migration-failure-withfc-3128fff7c48e739f.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    `Bug #1887908 <https://bugs.launchpad.net/cinder/+bug/1887908>`_：
+    In NEC driver, fix live-migration failure with FC.
+