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