elanmanager/impl/src/main/java/org/opendaylight/netvirt/elan/l2gw/utils/L2GatewayConnectionUtils.java

   1 /*
   2  * Copyright (c) 2016 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.netvirt.elan.l2gw.utils;
  10
  11 import static java.util.Collections.emptyList;
  12 import static org.opendaylight.netvirt.elan.utils.ElanUtils.isVxlanNetworkOrVxlanSegment;
  13
  14 import com.google.common.base.Optional;
  15 import com.google.common.collect.Lists;
  16 import com.google.common.util.concurrent.Futures;
  17 import com.google.common.util.concurrent.MoreExecutors;
  18 import com.google.common.util.concurrent.SettableFuture;
  19 import java.util.ArrayList;
  20 import java.util.List;
  21 import java.util.Objects;
  22 import java.util.Set;
  23 import java.util.concurrent.CopyOnWriteArrayList;
  24 import javax.annotation.PreDestroy;
  25 import javax.inject.Inject;
  26 import javax.inject.Singleton;
  27 import org.eclipse.jdt.annotation.NonNull;
  28 import org.eclipse.jdt.annotation.Nullable;
  29 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  30 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  31 import org.opendaylight.genius.mdsalutil.MDSALUtil;
  32 import org.opendaylight.genius.utils.hwvtep.HwvtepNodeHACache;
  33 import org.opendaylight.genius.utils.hwvtep.HwvtepSouthboundUtils;
  34 import org.opendaylight.infrautils.jobcoordinator.JobCoordinator;
  35 import org.opendaylight.netvirt.elan.cache.ElanInstanceCache;
  36 import org.opendaylight.netvirt.elan.l2gw.ha.listeners.HAOpClusteredListener;
  37 import org.opendaylight.netvirt.elan.l2gw.jobs.AssociateHwvtepToElanJob;
  38 import org.opendaylight.netvirt.elan.l2gw.jobs.DisAssociateHwvtepFromElanJob;
  39 import org.opendaylight.netvirt.elan.l2gw.listeners.LocalUcastMacListener;
  40 import org.opendaylight.netvirt.elan.utils.ElanClusterUtils;
  41 import org.opendaylight.netvirt.elanmanager.utils.ElanL2GwCacheUtils;
  42 import org.opendaylight.netvirt.neutronvpn.api.l2gw.L2GatewayCache;
  43 import org.opendaylight.netvirt.neutronvpn.api.l2gw.L2GatewayDevice;
  44 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.instances.ElanInstance;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l2gateways.rev150712.l2gateway.attributes.Devices;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l2gateways.rev150712.l2gateway.connections.attributes.L2gatewayConnections;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l2gateways.rev150712.l2gateway.connections.attributes.l2gatewayconnections.L2gatewayConnection;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l2gateways.rev150712.l2gateways.attributes.L2gateways;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l2gateways.rev150712.l2gateways.attributes.l2gateways.L2gateway;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l2gateways.rev150712.l2gateways.attributes.l2gateways.L2gatewayKey;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.rev150712.Neutron;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.HwvtepGlobalAugmentation;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.LocalUcastMacs;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.LogicalSwitches;
  56 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
  57 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  58 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  59 import org.slf4j.Logger;
  60 import org.slf4j.LoggerFactory;
  61
  62 @Singleton
  63 public class L2GatewayConnectionUtils implements AutoCloseable {
  64     private static final Logger LOG = LoggerFactory.getLogger(L2GatewayConnectionUtils.class);
  65
  66     private final DataBroker broker;
  67     private final ElanL2GatewayUtils elanL2GatewayUtils;
  68     private final ElanClusterUtils elanClusterUtils;
  69     private final ElanL2GatewayMulticastUtils elanL2GatewayMulticastUtils;
  70     private final JobCoordinator jobCoordinator;
  71     private final L2GatewayCache l2GatewayCache;
  72     private final ElanInstanceCache elanInstanceCache;
  73     private final List<AutoCloseable> closeables = new CopyOnWriteArrayList<>();
  74     private final HwvtepNodeHACache hwvtepNodeHACache;
  75     private final HAOpClusteredListener haOpClusteredListener;
  76     private final ElanRefUtil elanRefUtil;
  77
  78     @Inject
  79     public L2GatewayConnectionUtils(DataBroker dataBroker, ElanClusterUtils elanClusterUtils,
  80                                     ElanL2GatewayUtils elanL2GatewayUtils, JobCoordinator jobCoordinator,
  81                                     ElanL2GatewayMulticastUtils elanL2GatewayMulticastUtils,
  82                                     L2GatewayCache l2GatewayCache, HAOpClusteredListener haOpClusteredListener,
  83                                     ElanInstanceCache elanInstanceCache, HwvtepNodeHACache hwvtepNodeHACache,
  84                                     ElanRefUtil elanRefUtil) {
  85         this.broker = dataBroker;
  86         this.elanL2GatewayUtils = elanL2GatewayUtils;
  87         this.elanClusterUtils = elanClusterUtils;
  88         this.elanL2GatewayMulticastUtils = elanL2GatewayMulticastUtils;
  89         this.jobCoordinator = jobCoordinator;
  90         this.l2GatewayCache = l2GatewayCache;
  91         this.haOpClusteredListener = haOpClusteredListener;
  92         this.elanInstanceCache = elanInstanceCache;
  93         this.hwvtepNodeHACache = hwvtepNodeHACache;
  94         this.elanRefUtil = elanRefUtil;
  95     }
  96
  97     @Override
  98     @PreDestroy
  99     @SuppressWarnings("checkstyle:IllegalCatch")
 100     public void close() {
 101         closeables.forEach(c -> {
 102             try {
 103                 c.close();
 104             } catch (Exception e) {
 105                 LOG.warn("Error closing {}", c, e);
 106             }
 107         });
 108     }
 109
 110     public static boolean isGatewayAssociatedToL2Device(L2GatewayDevice l2GwDevice) {
 111         return !l2GwDevice.getL2GatewayIds().isEmpty();
 112     }
 113
 114     @Nullable
 115     public static L2gateway getNeutronL2gateway(DataBroker broker, Uuid l2GatewayId) {
 116         LOG.debug("getNeutronL2gateway for {}", l2GatewayId.getValue());
 117         InstanceIdentifier<L2gateway> inst = InstanceIdentifier.create(Neutron.class).child(L2gateways.class)
 118                 .child(L2gateway.class, new L2gatewayKey(l2GatewayId));
 119         return MDSALUtil.read(broker, LogicalDatastoreType.CONFIGURATION, inst).orNull();
 120     }
 121
 122     @NonNull
 123     public static List<L2gateway> getL2gatewayList(DataBroker broker) {
 124         InstanceIdentifier<L2gateways> inst = InstanceIdentifier.create(Neutron.class).child(L2gateways.class);
 125         return MDSALUtil.read(broker, LogicalDatastoreType.CONFIGURATION, inst).toJavaUtil().map(
 126                 L2gateways::getL2gateway).orElse(emptyList());
 127     }
 128
 129     @NonNull
 130     public static List<L2gatewayConnection> getAllL2gatewayConnections(DataBroker broker) {
 131         InstanceIdentifier<L2gatewayConnections> inst = InstanceIdentifier.create(Neutron.class)
 132                 .child(L2gatewayConnections.class);
 133         return MDSALUtil.read(broker, LogicalDatastoreType.CONFIGURATION, inst).toJavaUtil().map(
 134                 L2gatewayConnections::getL2gatewayConnection).orElse(emptyList());
 135     }
 136
 137     /**
 138      * Gets the associated l2 gw connections.
 139      *
 140      * @param broker
 141      *            the broker
 142      * @param l2GatewayIds
 143      *            the l2 gateway ids
 144      * @return the associated l2 gw connections
 145      */
 146     @NonNull
 147     public static List<L2gatewayConnection> getAssociatedL2GwConnections(DataBroker broker, Set<Uuid> l2GatewayIds) {
 148         List<L2gatewayConnection> allL2GwConns = getAllL2gatewayConnections(broker);
 149         List<L2gatewayConnection> l2GwConnections = new ArrayList<>();
 150         for (Uuid l2GatewayId : l2GatewayIds) {
 151             for (L2gatewayConnection l2GwConn : allL2GwConns) {
 152                 if (Objects.equals(l2GwConn.getL2gatewayId(), l2GatewayId)) {
 153                     l2GwConnections.add(l2GwConn);
 154                 }
 155             }
 156         }
 157         return l2GwConnections;
 158     }
 159
 160     /**
 161      * Gets the associated l2 gw connections.
 162      *
 163      * @param broker
 164      *            the broker
 165      * @param elanName
 166      *            the elan Name
 167      * @return the associated l2 gw connection with elan
 168      */
 169     @NonNull
 170     public static List<L2gatewayConnection> getL2GwConnectionsByElanName(DataBroker broker, String elanName) {
 171         List<L2gatewayConnection> allL2GwConns = getAllL2gatewayConnections(broker);
 172         List<L2gatewayConnection> elanL2GateWayConnections = new ArrayList<>();
 173         for (L2gatewayConnection l2GwConn : allL2GwConns) {
 174             if (l2GwConn.getNetworkId().getValue().equalsIgnoreCase(elanName)) {
 175                 elanL2GateWayConnections.add(l2GwConn);
 176             }
 177         }
 178         return elanL2GateWayConnections;
 179     }
 180
 181     public void addL2GatewayConnection(L2gatewayConnection input) {
 182         addL2GatewayConnection(input, null/*deviceName*/, null);
 183     }
 184
 185     public void addL2GatewayConnection(final L2gatewayConnection input,
 186                                        final String l2GwDeviceName) {
 187         addL2GatewayConnection(input, l2GwDeviceName, null);
 188     }
 189
 190     public void addL2GatewayConnection(final L2gatewayConnection input,
 191                                        @Nullable final String l2GwDeviceName ,
 192                                        @Nullable L2gateway l2Gateway) {
 193         LOG.info("Adding L2gateway Connection with ID: {}", input.key().getUuid());
 194
 195         Uuid networkUuid = input.getNetworkId();
 196
 197         // Taking cluster reboot scenario , if Elan instance is not available when l2GatewayConnection add events
 198         // comes we need to wait for elaninstance to resolve. Hence updating the map with the runnable .
 199         // When elanInstance add comes , it look in to the map and run the associated runnable associated with it.
 200         ElanInstance elanInstance = elanInstanceCache.get(networkUuid.getValue(),
 201             () -> addL2GatewayConnection(input, l2GwDeviceName)).orNull();
 202         if (elanInstance == null) {
 203             return;
 204         }
 205
 206         if (!isVxlanNetworkOrVxlanSegment(elanInstance)) {
 207             LOG.error("Neutron network with id {} is not VxlanNetwork", networkUuid.getValue());
 208         } else {
 209             Uuid l2GatewayId = input.getL2gatewayId();
 210             if (l2Gateway == null) {
 211                 l2Gateway = getNeutronL2gateway(broker, l2GatewayId);
 212             }
 213             if (l2Gateway == null) {
 214                 LOG.error("L2Gateway with id {} is not present", l2GatewayId.getValue());
 215             } else {
 216                 associateHwvtepsToElan(elanInstance, l2Gateway, input, l2GwDeviceName);
 217             }
 218         }
 219     }
 220
 221     public void deleteL2GatewayConnection(L2gatewayConnection input) {
 222         LOG.info("Deleting L2gateway Connection with ID: {}", input.key().getUuid());
 223
 224         Uuid networkUuid = input.getNetworkId();
 225         String elanName = networkUuid.getValue();
 226         disAssociateHwvtepsFromElan(elanName, input);
 227     }
 228
 229     private void disAssociateHwvtepsFromElan(String elanName, L2gatewayConnection input) {
 230         Integer defaultVlan = input.getSegmentId();
 231         List<L2GatewayDevice> l2Devices = ElanL2GwCacheUtils.getAllElanDevicesFromCache();
 232         List<Devices> l2gwDevicesToBeDeleted = new ArrayList<>();
 233         for (L2GatewayDevice elanL2gwDevice : l2Devices) {
 234             if (elanL2gwDevice.getL2GatewayIds().contains(input.key().getUuid())) {
 235                 l2gwDevicesToBeDeleted.addAll(elanL2gwDevice.getDevicesForL2gwConnectionId(input.key().getUuid()));
 236             }
 237         }
 238         if (l2gwDevicesToBeDeleted.isEmpty()) {
 239             //delete logical switch
 240             Uuid l2GatewayId = input.getL2gatewayId();
 241             L2gateway l2Gateway = L2GatewayConnectionUtils.getNeutronL2gateway(broker, l2GatewayId);
 242             if (l2Gateway == null) {
 243                 LOG.error("Failed to find the l2gateway for the connection {}", input.getUuid());
 244                 return;
 245             } else if (l2Gateway.getDevices() != null) {
 246                 l2gwDevicesToBeDeleted.addAll(l2Gateway.getDevices());
 247             }
 248         }
 249         for (Devices l2Device : l2gwDevicesToBeDeleted) {
 250             String l2DeviceName = l2Device.getDeviceName();
 251             L2GatewayDevice l2GatewayDevice = l2GatewayCache.get(l2DeviceName);
 252             String hwvtepNodeId = l2GatewayDevice.getHwvtepNodeId();
 253             boolean isLastL2GwConnDeleted = false;
 254             L2GatewayDevice elanL2GwDevice = ElanL2GwCacheUtils.getL2GatewayDeviceFromCache(elanName, hwvtepNodeId);
 255             if (elanL2GwDevice != null && isLastL2GwConnBeingDeleted(elanL2GwDevice)) {
 256                 // Delete L2 Gateway device from 'ElanL2GwDevice' cache
 257                 LOG.debug("Elan L2Gw Conn cache removed for id {}", hwvtepNodeId);
 258                 ElanL2GwCacheUtils.removeL2GatewayDeviceFromCache(elanName, hwvtepNodeId);
 259                 isLastL2GwConnDeleted = true;
 260             } else {
 261                 Uuid l2GwConnId = input.key().getUuid();
 262                 LOG.debug("Elan L2Gw Conn cache with id {} is being referred by other L2Gw Conns; so only "
 263                         + "L2 Gw Conn {} reference is removed", hwvtepNodeId, l2GwConnId);
 264                 if (elanL2GwDevice != null) {
 265                     elanL2GwDevice.removeL2GatewayId(l2GwConnId);
 266                 } else {
 267                     isLastL2GwConnDeleted = true;
 268                 }
 269             }
 270
 271             DisAssociateHwvtepFromElanJob disAssociateHwvtepToElanJob =
 272                     new DisAssociateHwvtepFromElanJob(elanL2GatewayUtils, elanL2GatewayMulticastUtils,
 273                             elanL2GwDevice, elanName,
 274                         l2Device, defaultVlan, hwvtepNodeId, isLastL2GwConnDeleted);
 275             elanClusterUtils.runOnlyInOwnerNode(disAssociateHwvtepToElanJob.getJobKey(), "remove l2gw connection job",
 276                     disAssociateHwvtepToElanJob);
 277         }
 278     }
 279
 280     private void associateHwvtepsToElan(ElanInstance elanInstance,
 281             L2gateway l2Gateway, L2gatewayConnection input, @Nullable String l2GwDeviceName) {
 282         String elanName = elanInstance.getElanInstanceName();
 283         Integer defaultVlan = input.getSegmentId();
 284         Uuid l2GwConnId = input.key().getUuid();
 285         List<Devices> l2Devices = l2Gateway.getDevices();
 286
 287         LOG.trace("Associating ELAN {} with L2Gw Conn Id {} having below L2Gw devices {}", elanName, l2GwConnId,
 288                 l2Devices);
 289
 290         if (l2Devices == null) {
 291             return;
 292         }
 293
 294         for (Devices l2Device : l2Devices) {
 295             String l2DeviceName = l2Device.getDeviceName();
 296             // L2gateway can have more than one L2 Gw devices. Configure Logical Switch, VLAN mappings,...
 297             // only on the switch which has come up just now and exclude all other devices from
 298             // preprovisioning/re-provisioning
 299             if (l2GwDeviceName != null && !l2GwDeviceName.equals(l2DeviceName)) {
 300                 LOG.debug("Associating Hwvtep to ELAN is not been processed for {}; as only {} got connected now!",
 301                         l2DeviceName, l2GwDeviceName);
 302                 continue;
 303             }
 304             L2GatewayDevice l2GatewayDevice = l2GatewayCache.get(l2DeviceName);
 305             if (isL2GwDeviceConnected(l2GatewayDevice)) {
 306                 NodeId hwvtepNodeId = new NodeId(l2GatewayDevice.getHwvtepNodeId());
 307
 308                 // Delete pending delete logical switch task if scheduled
 309                 elanL2GatewayUtils.cancelDeleteLogicalSwitch(hwvtepNodeId,
 310                         ElanL2GatewayUtils.getLogicalSwitchFromElan(elanName));
 311
 312                 // Add L2 Gateway device to 'ElanL2GwDevice' cache
 313                 boolean createLogicalSwitch;
 314                 addL2DeviceToElanL2GwCache(elanName, l2GatewayDevice, l2GwConnId, l2Device);
 315
 316                 AssociateHwvtepToElanJob associateHwvtepToElanJob = new AssociateHwvtepToElanJob(broker,
 317                         elanL2GatewayUtils, elanL2GatewayMulticastUtils, elanInstanceCache, l2GatewayDevice,
 318                         elanInstance, l2Device, defaultVlan, elanRefUtil);
 319
 320                 elanClusterUtils.runOnlyInOwnerNode(associateHwvtepToElanJob.getJobKey(),
 321                         "create logical switch in hwvtep topo", associateHwvtepToElanJob);
 322
 323             } else {
 324                 LOG.info("L2GwConn create is not handled for device with id {} as it's not connected", l2DeviceName);
 325             }
 326         }
 327     }
 328
 329     public L2GatewayDevice addL2DeviceToElanL2GwCache(String elanName, L2GatewayDevice l2GatewayDevice, Uuid l2GwConnId,
 330             Devices l2Device) {
 331         String l2gwDeviceNodeId = l2GatewayDevice.getHwvtepNodeId();
 332         L2GatewayDevice elanL2GwDevice = ElanL2GwCacheUtils.getL2GatewayDeviceFromCache(elanName, l2gwDeviceNodeId);
 333         if (elanL2GwDevice == null) {
 334             elanL2GwDevice = new L2GatewayDevice(l2GatewayDevice.getDeviceName());
 335             elanL2GwDevice.setHwvtepNodeId(l2gwDeviceNodeId);
 336             elanL2GwDevice.setTunnelIps(l2GatewayDevice.getTunnelIps());
 337             ElanL2GwCacheUtils.addL2GatewayDeviceToCache(elanName, elanL2GwDevice);
 338             LOG.debug("Elan L2GwConn cache created for hwvtep id {}", l2gwDeviceNodeId);
 339         } else {
 340             LOG.debug("Elan L2GwConn cache already exists for hwvtep id {}; updating L2GwConn id {} to it",
 341                     l2gwDeviceNodeId, l2GwConnId);
 342         }
 343         elanL2GwDevice.addL2GatewayId(l2GwConnId);
 344         elanL2GwDevice.addL2gwConnectionIdToDevice(l2GwConnId, l2Device);
 345
 346         //incase of cluster reboot scenario southbound device would have added more macs
 347         //while odl is down, pull them now
 348         readAndCopyLocalUcastMacsToCache(elanName, l2GatewayDevice);
 349
 350         LOG.trace("Elan L2GwConn cache updated with below details: {}", elanL2GwDevice);
 351         return elanL2GwDevice;
 352     }
 353
 354     private static boolean isL2GwDeviceConnected(L2GatewayDevice l2GwDevice) {
 355         return l2GwDevice != null && l2GwDevice.getHwvtepNodeId() != null;
 356     }
 357
 358     protected static boolean isLastL2GwConnBeingDeleted(@NonNull L2GatewayDevice l2GwDevice) {
 359         return l2GwDevice.getL2GatewayIds().size() == 1;
 360     }
 361
 362     private void readAndCopyLocalUcastMacsToCache(final String elanName, final L2GatewayDevice l2GatewayDevice) {
 363         final InstanceIdentifier<Node> nodeIid = HwvtepSouthboundUtils.createInstanceIdentifier(
 364                 new NodeId(l2GatewayDevice.getHwvtepNodeId()));
 365         jobCoordinator.enqueueJob(elanName + ":" + l2GatewayDevice.getDeviceName(), () -> {
 366             final SettableFuture settableFuture = SettableFuture.create();
 367             Futures.addCallback(broker.newReadOnlyTransaction().read(LogicalDatastoreType.OPERATIONAL,
 368                     nodeIid), new SettableFutureCallback<Optional<Node>>(settableFuture) {
 369                         @Override
 370                         public void onSuccess(@NonNull Optional<Node> resultNode) {
 371                             LocalUcastMacListener localUcastMacListener =
 372                                     new LocalUcastMacListener(broker, haOpClusteredListener,
 373                                             elanL2GatewayUtils, jobCoordinator, elanInstanceCache, hwvtepNodeHACache);
 374                             settableFuture.set(resultNode);
 375                             Optional<Node> nodeOptional = resultNode;
 376                             if (nodeOptional.isPresent()) {
 377                                 Node node = nodeOptional.get();
 378                                 if (node.augmentation(HwvtepGlobalAugmentation.class) != null) {
 379                                     List<LocalUcastMacs> localUcastMacs =
 380                                             node.augmentation(HwvtepGlobalAugmentation.class).getLocalUcastMacs();
 381                                     if (localUcastMacs == null) {
 382                                         return;
 383                                     }
 384                                     localUcastMacs.stream()
 385                                             .filter((mac) -> macBelongsToLogicalSwitch(mac, elanName))
 386                                             .forEach((mac) -> {
 387                                                 InstanceIdentifier<LocalUcastMacs> macIid = getMacIid(nodeIid, mac);
 388                                                 localUcastMacListener.added(macIid, mac);
 389                                             });
 390                                 }
 391                             }
 392                         }
 393                     }, MoreExecutors.directExecutor());
 394             return Lists.newArrayList(settableFuture);
 395         } , 5);
 396     }
 397
 398     /**
 399      * Gets the associated l2 gw connections.
 400      *
 401      * @param l2GatewayId the l2 gateway id
 402      *
 403      * @return the associated l2 gw connections
 404      */
 405     public List<L2gatewayConnection> getL2GwConnectionsByL2GatewayId(Uuid l2GatewayId) {
 406         List<L2gatewayConnection> l2GwConnections = new ArrayList<>();
 407         List<L2gatewayConnection> allL2GwConns = getAllL2gatewayConnections(broker);
 408         for (L2gatewayConnection l2GwConn : allL2GwConns) {
 409             if (Objects.equals(l2GwConn.getL2gatewayId(), l2GatewayId)) {
 410                 l2GwConnections.add(l2GwConn);
 411             }
 412         }
 413         return l2GwConnections;
 414     }
 415
 416     private static boolean macBelongsToLogicalSwitch(LocalUcastMacs mac, String logicalSwitchName) {
 417         InstanceIdentifier<LogicalSwitches> iid = (InstanceIdentifier<LogicalSwitches>)
 418                 mac.getLogicalSwitchRef().getValue();
 419         return iid.firstKeyOf(LogicalSwitches.class).getHwvtepNodeName().getValue().equals(logicalSwitchName);
 420     }
 421
 422     static InstanceIdentifier<LocalUcastMacs> getMacIid(InstanceIdentifier<Node> nodeIid, LocalUcastMacs mac) {
 423         return nodeIid.augmentation(HwvtepGlobalAugmentation.class).child(LocalUcastMacs.class, mac.key());
 424     }
 425 }