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.cache.ElanInstanceCache;
  34 import org.opendaylight.netvirt.elan.l2gw.ha.listeners.HAOpClusteredListener;
  35 import org.opendaylight.netvirt.elan.l2gw.jobs.AssociateHwvtepToElanJob;
  36 import org.opendaylight.netvirt.elan.l2gw.jobs.DisAssociateHwvtepFromElanJob;
  37 import org.opendaylight.netvirt.elan.l2gw.listeners.HwvtepLogicalSwitchListener;
  38 import org.opendaylight.netvirt.elan.l2gw.listeners.LocalUcastMacListener;
  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 ElanL2GatewayUtils elanL2GatewayUtils;
  67     private final ElanClusterUtils elanClusterUtils;
  68     private final ElanL2GatewayMulticastUtils elanL2GatewayMulticastUtils;
  69     private final JobCoordinator jobCoordinator;
  70     private final L2GatewayCache l2GatewayCache;
  71     private final ElanInstanceCache elanInstanceCache;
  72     private final List<AutoCloseable> closeables = new CopyOnWriteArrayList<>();
  73     private final HAOpClusteredListener haOpClusteredListener;
  74
  75     @Inject
  76     public L2GatewayConnectionUtils(DataBroker dataBroker,
  77             ElanClusterUtils elanClusterUtils, ElanL2GatewayUtils elanL2GatewayUtils,
  78             JobCoordinator jobCoordinator, ElanL2GatewayMulticastUtils elanL2GatewayMulticastUtils,
  79             L2GatewayCache l2GatewayCache, HAOpClusteredListener haOpClusteredListener,
  80             ElanInstanceCache elanInstanceCache) {
  81         this.broker = dataBroker;
  82         this.elanL2GatewayUtils = elanL2GatewayUtils;
  83         this.elanClusterUtils = elanClusterUtils;
  84         this.elanL2GatewayMulticastUtils = elanL2GatewayMulticastUtils;
  85         this.jobCoordinator = jobCoordinator;
  86         this.l2GatewayCache = l2GatewayCache;
  87         this.haOpClusteredListener = haOpClusteredListener;
  88         this.elanInstanceCache = elanInstanceCache;
  89     }
  90
  91     @Override
  92     @PreDestroy
  93     @SuppressWarnings("checkstyle:IllegalCatch")
  94     public void close() {
  95         closeables.forEach(c -> {
  96             try {
  97                 c.close();
  98             } catch (Exception e) {
  99                 LOG.warn("Error closing {}", c, e);
 100             }
 101         });
 102     }
 103
 104     public static boolean isGatewayAssociatedToL2Device(L2GatewayDevice l2GwDevice) {
 105         return l2GwDevice.getL2GatewayIds().size() > 0;
 106     }
 107
 108     public static L2gateway getNeutronL2gateway(DataBroker broker, Uuid l2GatewayId) {
 109         LOG.debug("getNeutronL2gateway for {}", l2GatewayId.getValue());
 110         InstanceIdentifier<L2gateway> inst = InstanceIdentifier.create(Neutron.class).child(L2gateways.class)
 111                 .child(L2gateway.class, new L2gatewayKey(l2GatewayId));
 112         return MDSALUtil.read(broker, LogicalDatastoreType.CONFIGURATION, inst).orNull();
 113     }
 114
 115     @Nonnull
 116     public static List<L2gateway> getL2gatewayList(DataBroker broker) {
 117         InstanceIdentifier<L2gateways> inst = InstanceIdentifier.create(Neutron.class).child(L2gateways.class);
 118         return MDSALUtil.read(broker, LogicalDatastoreType.CONFIGURATION, inst).toJavaUtil().map(
 119                 L2gateways::getL2gateway).orElse(Collections.emptyList());
 120     }
 121
 122     @Nonnull
 123     public static List<L2gatewayConnection> getAllL2gatewayConnections(DataBroker broker) {
 124         InstanceIdentifier<L2gatewayConnections> inst = InstanceIdentifier.create(Neutron.class)
 125                 .child(L2gatewayConnections.class);
 126         return MDSALUtil.read(broker, LogicalDatastoreType.CONFIGURATION, inst).toJavaUtil().map(
 127                 L2gatewayConnections::getL2gatewayConnection).orElse(Collections.emptyList());
 128     }
 129
 130     /**
 131      * Gets the associated l2 gw connections.
 132      *
 133      * @param broker
 134      *            the broker
 135      * @param l2GatewayIds
 136      *            the l2 gateway ids
 137      * @return the associated l2 gw connections
 138      */
 139     @Nonnull
 140     public static List<L2gatewayConnection> getAssociatedL2GwConnections(DataBroker broker, Set<Uuid> l2GatewayIds) {
 141         List<L2gatewayConnection> allL2GwConns = getAllL2gatewayConnections(broker);
 142         List<L2gatewayConnection> l2GwConnections = new ArrayList<>();
 143         for (Uuid l2GatewayId : l2GatewayIds) {
 144             for (L2gatewayConnection l2GwConn : allL2GwConns) {
 145                 if (l2GwConn.getL2gatewayId().equals(l2GatewayId)) {
 146                     l2GwConnections.add(l2GwConn);
 147                 }
 148             }
 149         }
 150         return l2GwConnections;
 151     }
 152
 153     /**
 154      * Gets the associated l2 gw connections.
 155      *
 156      * @param broker
 157      *            the broker
 158      * @param elanName
 159      *            the elan Name
 160      * @return the associated l2 gw connection with elan
 161      */
 162     @Nonnull
 163     public static List<L2gatewayConnection> getL2GwConnectionsByElanName(DataBroker broker, String elanName) {
 164         List<L2gatewayConnection> allL2GwConns = getAllL2gatewayConnections(broker);
 165         List<L2gatewayConnection> elanL2GateWayConnections = new ArrayList<>();
 166         for (L2gatewayConnection l2GwConn : allL2GwConns) {
 167             if (l2GwConn.getNetworkId().getValue().equalsIgnoreCase(elanName)) {
 168                 elanL2GateWayConnections.add(l2GwConn);
 169             }
 170         }
 171         return elanL2GateWayConnections;
 172     }
 173
 174     public void addL2GatewayConnection(L2gatewayConnection input) {
 175         addL2GatewayConnection(input, null/*deviceName*/, null);
 176     }
 177
 178     public void addL2GatewayConnection(final L2gatewayConnection input,
 179                                        final String l2GwDeviceName) {
 180         addL2GatewayConnection(input, l2GwDeviceName, null);
 181     }
 182
 183     public void addL2GatewayConnection(final L2gatewayConnection input,
 184                                        final String l2GwDeviceName ,
 185                                        L2gateway l2Gateway) {
 186         LOG.info("Adding L2gateway Connection with ID: {}", input.getKey().getUuid());
 187
 188         Uuid networkUuid = input.getNetworkId();
 189
 190         // Taking cluster reboot scenario , if Elan instance is not available when l2GatewayConnection add events
 191         // comes we need to wait for elaninstance to resolve. Hence updating the map with the runnable .
 192         // When elanInstance add comes , it look in to the map and run the associated runnable associated with it.
 193         ElanInstance elanInstance = elanInstanceCache.get(networkUuid.getValue(),
 194             () -> addL2GatewayConnection(input, l2GwDeviceName)).orNull();
 195         if (elanInstance == null) {
 196             return;
 197         }
 198
 199         if (!isVxlanNetworkOrVxlanSegment(elanInstance)) {
 200             LOG.error("Neutron network with id {} is not VxlanNetwork", networkUuid.getValue());
 201         } else {
 202             Uuid l2GatewayId = input.getL2gatewayId();
 203             if (l2Gateway == null) {
 204                 l2Gateway = getNeutronL2gateway(broker, l2GatewayId);
 205             }
 206             if (l2Gateway == null) {
 207                 LOG.error("L2Gateway with id {} is not present", l2GatewayId.getValue());
 208             } else {
 209                 associateHwvtepsToElan(elanInstance, l2Gateway, input, l2GwDeviceName);
 210             }
 211         }
 212     }
 213
 214     public void deleteL2GatewayConnection(L2gatewayConnection input) {
 215         LOG.info("Deleting L2gateway Connection with ID: {}", input.getKey().getUuid());
 216
 217         Uuid networkUuid = input.getNetworkId();
 218         String elanName = networkUuid.getValue();
 219         disAssociateHwvtepsFromElan(elanName, input);
 220     }
 221
 222     private void disAssociateHwvtepsFromElan(String elanName, L2gatewayConnection input) {
 223         Integer defaultVlan = input.getSegmentId();
 224         List<L2GatewayDevice> l2Devices = ElanL2GwCacheUtils.getAllElanDevicesFromCache();
 225         List<Devices> l2gwDevicesToBeDeleted = new ArrayList<>();
 226         for (L2GatewayDevice elanL2gwDevice : l2Devices) {
 227             if (elanL2gwDevice.getL2GatewayIds().contains(input.getKey().getUuid())) {
 228                 l2gwDevicesToBeDeleted.addAll(elanL2gwDevice.getDevicesForL2gwConnectionId(input.getKey().getUuid()));
 229             }
 230         }
 231         if (l2gwDevicesToBeDeleted.isEmpty()) {
 232             //delete logical switch
 233             Uuid l2GatewayId = input.getL2gatewayId();
 234             L2gateway l2Gateway = L2GatewayConnectionUtils.getNeutronL2gateway(broker, l2GatewayId);
 235             if (l2Gateway == null) {
 236                 LOG.error("Failed to find the l2gateway for the connection {}", input.getUuid());
 237                 return;
 238             } else {
 239                 l2gwDevicesToBeDeleted.addAll(l2Gateway.getDevices());
 240             }
 241         }
 242         for (Devices l2Device : l2gwDevicesToBeDeleted) {
 243             String l2DeviceName = l2Device.getDeviceName();
 244             L2GatewayDevice l2GatewayDevice = l2GatewayCache.get(l2DeviceName);
 245             String hwvtepNodeId = l2GatewayDevice.getHwvtepNodeId();
 246             boolean isLastL2GwConnDeleted = false;
 247             L2GatewayDevice elanL2GwDevice = ElanL2GwCacheUtils.getL2GatewayDeviceFromCache(elanName, hwvtepNodeId);
 248             if (elanL2GwDevice != null && isLastL2GwConnBeingDeleted(elanL2GwDevice)) {
 249                 // Delete L2 Gateway device from 'ElanL2GwDevice' cache
 250                 LOG.debug("Elan L2Gw Conn cache removed for id {}", hwvtepNodeId);
 251                 ElanL2GwCacheUtils.removeL2GatewayDeviceFromCache(elanName, hwvtepNodeId);
 252                 isLastL2GwConnDeleted = true;
 253             } else {
 254                 Uuid l2GwConnId = input.getKey().getUuid();
 255                 LOG.debug("Elan L2Gw Conn cache with id {} is being referred by other L2Gw Conns; so only "
 256                         + "L2 Gw Conn {} reference is removed", hwvtepNodeId, l2GwConnId);
 257                 if (elanL2GwDevice != null) {
 258                     elanL2GwDevice.removeL2GatewayId(l2GwConnId);
 259                 } else {
 260                     isLastL2GwConnDeleted = true;
 261                 }
 262             }
 263
 264             DisAssociateHwvtepFromElanJob disAssociateHwvtepToElanJob =
 265                     new DisAssociateHwvtepFromElanJob(elanL2GatewayUtils, elanL2GatewayMulticastUtils,
 266                             elanL2GwDevice, elanName, () -> elanInstanceCache.get(elanName).orNull(),
 267                             l2Device, defaultVlan, hwvtepNodeId, isLastL2GwConnDeleted);
 268             elanClusterUtils.runOnlyInOwnerNode(disAssociateHwvtepToElanJob.getJobKey(), "remove l2gw connection job",
 269                     disAssociateHwvtepToElanJob);
 270         }
 271     }
 272
 273     private void associateHwvtepsToElan(ElanInstance elanInstance,
 274             L2gateway l2Gateway, L2gatewayConnection input, String l2GwDeviceName) {
 275         String elanName = elanInstance.getElanInstanceName();
 276         Integer defaultVlan = input.getSegmentId();
 277         Uuid l2GwConnId = input.getKey().getUuid();
 278         List<Devices> l2Devices = l2Gateway.getDevices();
 279
 280         LOG.trace("Associating ELAN {} with L2Gw Conn Id {} having below L2Gw devices {}", elanName, l2GwConnId,
 281                 l2Devices);
 282
 283         for (Devices l2Device : l2Devices) {
 284             String l2DeviceName = l2Device.getDeviceName();
 285             // L2gateway can have more than one L2 Gw devices. Configure Logical Switch, VLAN mappings,...
 286             // only on the switch which has come up just now and exclude all other devices from
 287             // preprovisioning/re-provisioning
 288             if (l2GwDeviceName != null && !l2GwDeviceName.equals(l2DeviceName)) {
 289                 LOG.debug("Associating Hwvtep to ELAN is not been processed for {}; as only {} got connected now!",
 290                         l2DeviceName, l2GwDeviceName);
 291                 continue;
 292             }
 293             L2GatewayDevice l2GatewayDevice = l2GatewayCache.get(l2DeviceName);
 294             if (isL2GwDeviceConnected(l2GatewayDevice)) {
 295                 NodeId hwvtepNodeId = new NodeId(l2GatewayDevice.getHwvtepNodeId());
 296
 297                 // Delete pending delete logical switch task if scheduled
 298                 elanL2GatewayUtils.cancelDeleteLogicalSwitch(hwvtepNodeId,
 299                         ElanL2GatewayUtils.getLogicalSwitchFromElan(elanName));
 300
 301                 // Add L2 Gateway device to 'ElanL2GwDevice' cache
 302                 boolean createLogicalSwitch;
 303                 LogicalSwitches logicalSwitch = HwvtepUtils.getLogicalSwitch(broker, LogicalDatastoreType.CONFIGURATION,
 304                         hwvtepNodeId, elanName);
 305                 if (logicalSwitch == null) {
 306                     HwvtepLogicalSwitchListener hwVTEPLogicalSwitchListener = new HwvtepLogicalSwitchListener(
 307                             elanInstanceCache, elanL2GatewayUtils, elanClusterUtils, elanL2GatewayMulticastUtils,
 308                             this, l2GatewayDevice, elanName, l2Device, defaultVlan, l2GwConnId);
 309                     hwVTEPLogicalSwitchListener.registerListener(LogicalDatastoreType.OPERATIONAL, broker);
 310                     closeables.add(hwVTEPLogicalSwitchListener);
 311                     createLogicalSwitch = true;
 312                 } else {
 313                     addL2DeviceToElanL2GwCache(elanName, l2GatewayDevice, l2GwConnId, l2Device);
 314                     createLogicalSwitch = false;
 315                 }
 316                 AssociateHwvtepToElanJob associateHwvtepToElanJob = new AssociateHwvtepToElanJob(broker,
 317                         elanL2GatewayUtils, elanL2GatewayMulticastUtils, elanInstanceCache, l2GatewayDevice,
 318                         elanInstance, l2Device, defaultVlan, createLogicalSwitch);
 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);
 374                             settableFuture.set(resultNode);
 375                             Optional<Node> nodeOptional = resultNode;
 376                             if (nodeOptional.isPresent()) {
 377                                 Node node = nodeOptional.get();
 378                                 if (node.getAugmentation(HwvtepGlobalAugmentation.class) != null) {
 379                                     List<LocalUcastMacs> localUcastMacs =
 380                                             node.getAugmentation(HwvtepGlobalAugmentation.class).getLocalUcastMacs();
 381                                     if (localUcastMacs == null) {
 382                                         return;
 383                                     }
 384                                     localUcastMacs.stream()
 385                                             .filter((mac) -> {
 386                                                 return macBelongsToLogicalSwitch(mac, elanName);
 387                                             })
 388                                             .forEach((mac) -> {
 389                                                 InstanceIdentifier<LocalUcastMacs> macIid = getMacIid(nodeIid, mac);
 390                                                 localUcastMacListener.added(macIid, mac);
 391                                             });
 392                                 }
 393                             }
 394                         }
 395                     }, MoreExecutors.directExecutor());
 396             return Lists.newArrayList(settableFuture);
 397         } , 5);
 398     }
 399
 400     /**
 401      * Gets the associated l2 gw connections.
 402      *
 403      * @param l2GatewayId the l2 gateway id
 404      *
 405      * @return the associated l2 gw connections
 406      */
 407     public List<L2gatewayConnection> getL2GwConnectionsByL2GatewayId(Uuid l2GatewayId) {
 408         List<L2gatewayConnection> l2GwConnections = new ArrayList<>();
 409         List<L2gatewayConnection> allL2GwConns = getAllL2gatewayConnections(broker);
 410         for (L2gatewayConnection l2GwConn : allL2GwConns) {
 411             if (l2GwConn.getL2gatewayId().equals(l2GatewayId)) {
 412                 l2GwConnections.add(l2GwConn);
 413             }
 414         }
 415         return l2GwConnections;
 416     }
 417
 418     private static boolean macBelongsToLogicalSwitch(LocalUcastMacs mac, String logicalSwitchName) {
 419         InstanceIdentifier<LogicalSwitches> iid = (InstanceIdentifier<LogicalSwitches>)
 420                 mac.getLogicalSwitchRef().getValue();
 421         return iid.firstKeyOf(LogicalSwitches.class).getHwvtepNodeName().getValue().equals(logicalSwitchName);
 422     }
 423
 424     static InstanceIdentifier<LocalUcastMacs> getMacIid(InstanceIdentifier<Node> nodeIid, LocalUcastMacs mac) {
 425         return nodeIid.augmentation(HwvtepGlobalAugmentation.class).child(LocalUcastMacs.class, mac.getKey());
 426     }
 427 }