elanmanager/impl/src/main/java/org/opendaylight/netvirt/elan/evpn/utils/EvpnUtils.java

   1 /*
   2  * Copyright © 2017 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 package org.opendaylight.netvirt.elan.evpn.utils;
   9
  10 import static org.opendaylight.genius.infra.Datastore.CONFIGURATION;
  11
  12 import com.google.common.base.Optional;
  13 import com.google.common.util.concurrent.Futures;
  14 import com.google.common.util.concurrent.MoreExecutors;
  15 import com.google.common.util.concurrent.SettableFuture;
  16 import java.math.BigInteger;
  17 import java.util.ArrayList;
  18 import java.util.Collections;
  19 import java.util.List;
  20 import java.util.concurrent.ExecutionException;
  21 import java.util.concurrent.Future;
  22 import java.util.function.BiConsumer;
  23 import java.util.function.BiPredicate;
  24 import java.util.function.Function;
  25 import java.util.function.Predicate;
  26 import javax.inject.Inject;
  27 import javax.inject.Singleton;
  28 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  29 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  30 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
  31 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  32 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  33 import org.opendaylight.genius.infra.ManagedNewTransactionRunner;
  34 import org.opendaylight.genius.infra.ManagedNewTransactionRunnerImpl;
  35 import org.opendaylight.genius.interfacemanager.globals.InterfaceInfo;
  36 import org.opendaylight.genius.interfacemanager.interfaces.IInterfaceManager;
  37 import org.opendaylight.genius.itm.globals.ITMConstants;
  38 import org.opendaylight.genius.mdsalutil.FlowEntity;
  39 import org.opendaylight.genius.mdsalutil.InstructionInfo;
  40 import org.opendaylight.genius.mdsalutil.MDSALUtil;
  41 import org.opendaylight.genius.mdsalutil.MatchInfo;
  42 import org.opendaylight.genius.mdsalutil.NWUtil;
  43 import org.opendaylight.genius.mdsalutil.NwConstants;
  44 import org.opendaylight.genius.mdsalutil.instructions.InstructionGotoTable;
  45 import org.opendaylight.genius.mdsalutil.instructions.InstructionWriteMetadata;
  46 import org.opendaylight.genius.mdsalutil.matches.MatchTunnelId;
  47 import org.opendaylight.genius.utils.ServiceIndex;
  48 import org.opendaylight.infrautils.jobcoordinator.JobCoordinator;
  49 import org.opendaylight.infrautils.utils.concurrent.ListenableFutures;
  50 import org.opendaylight.netvirt.bgpmanager.api.IBgpManager;
  51 import org.opendaylight.netvirt.elan.cache.ElanInstanceCache;
  52 import org.opendaylight.netvirt.elan.l2gw.utils.SettableFutureCallback;
  53 import org.opendaylight.netvirt.elan.utils.ElanConstants;
  54 import org.opendaylight.netvirt.elan.utils.ElanUtils;
  55 import org.opendaylight.netvirt.elanmanager.api.ElanHelper;
  56 import org.opendaylight.netvirt.vpnmanager.api.IVpnManager;
  57 import org.opendaylight.yang.gen.v1.urn.huawei.params.xml.ns.yang.l3vpn.rev140815.vpn.instances.VpnInstance;
  58 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.list.Instruction;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.servicebinding.rev160406.service.bindings.services.info.BoundServices;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.ExternalTunnelList;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.external.tunnel.list.ExternalTunnel;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.DcGatewayIpList;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.dc.gateway.ip.list.DcGatewayIp;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.GetDpnEndpointIpsInputBuilder;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.GetDpnEndpointIpsOutput;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.ItmRpcService;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.EvpnAugmentation;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.instances.ElanInstance;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.forwarding.entries.MacEntry;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.VrfEntryBase;
  72 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.neutron.vpn.portip.port.data.VpnPortipToPort;
  73 import org.opendaylight.yangtools.yang.binding.DataObject;
  74 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  75 import org.opendaylight.yangtools.yang.common.RpcResult;
  76 import org.slf4j.Logger;
  77 import org.slf4j.LoggerFactory;
  78
  79 @Singleton
  80 public class EvpnUtils {
  81
  82     private static final Logger LOG = LoggerFactory.getLogger(EvpnUtils.class);
  83
  84     private final BiPredicate<String, String> isNetAttach = (var1, var2) -> (var1 == null && var2 != null);
  85     private final BiPredicate<String, String> isNetDetach = (var1, var2) -> (var1 != null && var2 == null);
  86     private final Predicate<MacEntry> isIpv4PrefixAvailable = (macEntry) -> (macEntry != null
  87         && macEntry.getIpPrefix() != null && macEntry.getIpPrefix().getIpv4Address() != null);
  88     private final DataBroker broker;
  89     private final ManagedNewTransactionRunner txRunner;
  90     private final IInterfaceManager interfaceManager;
  91     private final ElanUtils elanUtils;
  92     private final ItmRpcService itmRpcService;
  93     private final JobCoordinator jobCoordinator;
  94     private final IBgpManager bgpManager;
  95     private final IVpnManager vpnManager;
  96     private final ElanInstanceCache elanInstanceCache;
  97
  98     @Inject
  99     public EvpnUtils(DataBroker broker, IInterfaceManager interfaceManager, ElanUtils elanUtils,
 100             ItmRpcService itmRpcService, IVpnManager vpnManager, IBgpManager bgpManager,
 101             JobCoordinator jobCoordinator, ElanInstanceCache elanInstanceCache) {
 102         this.broker = broker;
 103         this.txRunner = new ManagedNewTransactionRunnerImpl(broker);
 104         this.interfaceManager = interfaceManager;
 105         this.elanUtils = elanUtils;
 106         this.itmRpcService = itmRpcService;
 107         this.vpnManager = vpnManager;
 108         this.bgpManager = bgpManager;
 109         this.jobCoordinator = jobCoordinator;
 110         this.elanInstanceCache = elanInstanceCache;
 111     }
 112
 113     public boolean isWithdrawEvpnRT2Routes(ElanInstance original, ElanInstance update) {
 114         return isNetDetach.test(getEvpnNameFromElan(original), getEvpnNameFromElan(update));
 115     }
 116
 117     public boolean isAdvertiseEvpnRT2Routes(ElanInstance original, ElanInstance update) {
 118         return isNetAttach.test(getEvpnNameFromElan(original), getEvpnNameFromElan(update));
 119     }
 120
 121     @SuppressWarnings("checkstyle:IllegalCatch")
 122     public void advertiseEvpnRT2Routes(EvpnAugmentation evpnAugmentation, String elanName)  {
 123         if (evpnAugmentation == null || evpnAugmentation.getEvpnName() == null) {
 124             return;
 125         }
 126         String evpnName = evpnAugmentation.getEvpnName();
 127         List<MacEntry> macEntries = elanUtils.getElanMacEntries(elanName);
 128         if (macEntries == null || macEntries.isEmpty()) {
 129             LOG.trace("advertiseEvpnRT2Routes no elan mac entries found for {}", elanName);
 130             return;
 131         }
 132         String rd = vpnManager.getVpnRd(broker, evpnName);
 133         ElanInstance elanInfo = elanInstanceCache.get(elanName).orNull();
 134         macEntries.stream().filter(isIpv4PrefixAvailable).forEach(macEntry -> {
 135             InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(macEntry.getInterface());
 136             if (interfaceInfo == null) {
 137                 LOG.debug("advertiseEvpnRT2Routes, interfaceInfo is null for interface {}", macEntry.getInterface());
 138                 return;
 139             }
 140             advertisePrefix(elanInfo, rd, macEntry.getMacAddress().getValue(),
 141                     macEntry.getIpPrefix().getIpv4Address().getValue(),
 142                     interfaceInfo.getInterfaceName(), interfaceInfo.getDpId());
 143         });
 144     }
 145
 146     public String getEndpointIpAddressForDPN(BigInteger dpnId) {
 147
 148         Future<RpcResult<GetDpnEndpointIpsOutput>> result = itmRpcService.getDpnEndpointIps(
 149                 new GetDpnEndpointIpsInputBuilder()
 150                         .setSourceDpid(dpnId)
 151                         .build());
 152         RpcResult<GetDpnEndpointIpsOutput> rpcResult = null;
 153         try {
 154             rpcResult = result.get();
 155         } catch (InterruptedException e) {
 156             LOG.error("getnextHopIpFromRpcOutput : InterruptedException for dpnid {}", dpnId, e);
 157             return null;
 158         } catch (ExecutionException e) {
 159             LOG.error("getnextHopIpFromRpcOutput : ExecutionException for dpnid {}", dpnId, e);
 160             return null;
 161         }
 162         if (!rpcResult.isSuccessful()) {
 163             LOG.warn("RPC Call to getDpnEndpointIps returned with Errors {}", rpcResult.getErrors());
 164             return null;
 165         }
 166
 167         List<IpAddress> nexthopIpList = rpcResult.getResult().getNexthopipList();
 168         return nexthopIpList.get(0).getIpv4Address().getValue();
 169     }
 170
 171     public Optional<String> getGatewayMacAddressForInterface(String vpnName,
 172                                                                                     String ifName, String ipAddress) {
 173         VpnPortipToPort gwPort = vpnManager.getNeutronPortFromVpnPortFixedIp(broker, vpnName, ipAddress);
 174         return Optional.of(gwPort != null && gwPort.isSubnetIp()
 175                 ? gwPort.getMacAddress()
 176                 : interfaceManager.getInterfaceInfoFromOperationalDataStore(ifName).getMacAddress());
 177     }
 178
 179     public String getL3vpnNameFromElan(ElanInstance elanInfo) {
 180         if (elanInfo == null) {
 181             LOG.debug("getL3vpnNameFromElan :elanInfo is NULL");
 182             return null;
 183         }
 184         EvpnAugmentation evpnAugmentation = elanInfo.augmentation(EvpnAugmentation.class);
 185         return evpnAugmentation != null ? evpnAugmentation.getL3vpnName() : null;
 186     }
 187
 188     public static String getEvpnNameFromElan(ElanInstance elanInfo) {
 189         if (elanInfo == null) {
 190             LOG.debug("getEvpnNameFromElan :elanInfo is NULL");
 191             return null;
 192         }
 193         EvpnAugmentation evpnAugmentation = elanInfo.augmentation(EvpnAugmentation.class);
 194         return evpnAugmentation != null ? evpnAugmentation.getEvpnName() : null;
 195     }
 196
 197     public String getEvpnRd(ElanInstance elanInfo) {
 198         String evpnName = getEvpnNameFromElan(elanInfo);
 199         if (evpnName == null) {
 200             LOG.debug("getEvpnRd : evpnName is NULL for elanInfo {}", elanInfo);
 201             return null;
 202         }
 203         return vpnManager.getVpnRd(broker, evpnName);
 204     }
 205
 206     public void advertisePrefix(ElanInstance elanInfo, String macAddress, String prefix,
 207                                  String interfaceName, BigInteger dpnId) {
 208         String rd = getEvpnRd(elanInfo);
 209         advertisePrefix(elanInfo, rd, macAddress, prefix, interfaceName, dpnId);
 210     }
 211
 212     @SuppressWarnings("checkstyle:IllegalCatch")
 213     public void advertisePrefix(ElanInstance elanInfo, String rd,
 214                                  String macAddress, String prefix, String interfaceName, BigInteger dpnId) {
 215         if (rd == null) {
 216             LOG.debug("advertisePrefix : rd is NULL for elanInfo {}, macAddress {}", elanInfo, macAddress);
 217             return;
 218         }
 219         String nextHop = getEndpointIpAddressForDPN(dpnId);
 220         if (nextHop == null) {
 221             LOG.debug("Failed to get the dpn tep ip for dpn {}", dpnId);
 222             return;
 223         }
 224         int vpnLabel = 0;
 225         long l2vni = elanUtils.getVxlanSegmentationId(elanInfo);
 226         long l3vni = 0;
 227         String gatewayMacAddr = null;
 228         String l3VpName = getL3vpnNameFromElan(elanInfo);
 229         if (l3VpName != null) {
 230             VpnInstance l3VpnInstance = vpnManager.getVpnInstance(broker, l3VpName);
 231             l3vni = l3VpnInstance.getL3vni();
 232             com.google.common.base.Optional<String> gatewayMac = getGatewayMacAddressForInterface(l3VpName,
 233                     interfaceName, prefix);
 234             gatewayMacAddr = gatewayMac.isPresent() ? gatewayMac.get() : null;
 235
 236         }
 237         LOG.info("Advertising routes with rd {},  macAddress {}, prefix {}, nextHop {},"
 238                         + " vpnLabel {}, l3vni {}, l2vni {}, gatewayMac {}", rd, macAddress, prefix, nextHop,
 239                 vpnLabel, l3vni, l2vni, gatewayMacAddr);
 240         try {
 241             bgpManager.advertisePrefix(rd, macAddress, prefix, nextHop,
 242                     VrfEntryBase.EncapType.Vxlan, vpnLabel, l3vni, l2vni, gatewayMacAddr);
 243         } catch (Exception e) {
 244             LOG.error("Failed to advertisePrefix", e);
 245         }
 246     }
 247
 248     public void advertisePrefix(ElanInstance elanInfo, MacEntry macEntry) {
 249         InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(macEntry.getInterface());
 250         if (interfaceInfo == null) {
 251             LOG.debug("advertisePrefix, interfaceInfo is null for interface {}", macEntry.getInterface());
 252             return;
 253         }
 254
 255         if (!isIpv4PrefixAvailable.test(macEntry)) {
 256             LOG.debug("advertisePrefix macEntry does not have IPv4 prefix {}", macEntry);
 257             return;
 258         }
 259         advertisePrefix(elanInfo, macEntry.getMacAddress().getValue(),
 260                 macEntry.getIpPrefix().getIpv4Address().getValue(),
 261                 interfaceInfo.getInterfaceName(), interfaceInfo.getDpId());
 262     }
 263
 264     public void withdrawEvpnRT2Routes(EvpnAugmentation evpnAugmentation, String elanName) {
 265         if (evpnAugmentation == null || evpnAugmentation.getEvpnName() == null) {
 266             LOG.trace("withdrawEvpnRT2Routes, evpnAugmentation is null");
 267             return;
 268         }
 269
 270         String evpnName = evpnAugmentation.getEvpnName();
 271         String rd = vpnManager.getVpnRd(broker, evpnName);
 272         if (rd == null) {
 273             LOG.debug("withdrawEvpnRT2Routes : rd is null for {}", elanName);
 274             return;
 275         }
 276         List<MacEntry> macEntries = elanUtils.getElanMacEntries(elanName);
 277         if (macEntries == null || macEntries.isEmpty()) {
 278             LOG.debug("withdrawEvpnRT2Routes : macEntries  is empty for elan {} ", elanName);
 279             return;
 280         }
 281         for (MacEntry macEntry : macEntries) {
 282             if (!isIpv4PrefixAvailable.test(macEntry)) {
 283                 LOG.debug("withdrawEvpnRT2Routes macEntry does not have IPv4 prefix {}", macEntry);
 284                 continue;
 285             }
 286             String prefix = macEntry.getIpPrefix().getIpv4Address().getValue();
 287             LOG.info("Withdrawing routes with rd {}, prefix {}", rd, prefix);
 288             bgpManager.withdrawPrefix(rd, prefix);
 289         }
 290     }
 291
 292     public void withdrawPrefix(ElanInstance elanInfo, String prefix) {
 293         String rd = getEvpnRd(elanInfo);
 294         if (rd == null) {
 295             return;
 296         }
 297         bgpManager.withdrawPrefix(rd, prefix);
 298     }
 299
 300     public void withdrawPrefix(ElanInstance elanInfo, MacEntry macEntry) {
 301         if (!isIpv4PrefixAvailable.test(macEntry)) {
 302             LOG.debug("withdrawPrefix macEntry does not have IPv4 prefix {}", macEntry);
 303             return;
 304         }
 305         withdrawPrefix(elanInfo, macEntry.getIpPrefix().getIpv4Address().getValue());
 306     }
 307
 308     public static InstanceIdentifier<ExternalTunnelList> getExternaTunnelListIdentifier() {
 309         return InstanceIdentifier
 310                 .builder(ExternalTunnelList.class).build();
 311     }
 312
 313     public Optional<ExternalTunnelList> getExternalTunnelList() {
 314         InstanceIdentifier<ExternalTunnelList> externalTunnelListId = getExternaTunnelListIdentifier();
 315         ExternalTunnelList externalTunnelList = null;
 316         try {
 317             externalTunnelList = elanUtils.read2(LogicalDatastoreType.CONFIGURATION,
 318                     externalTunnelListId).orNull();
 319         } catch (ReadFailedException e) {
 320             LOG.error("getExternalTunnelList: unable to read ExternalTunnelList, exception ", e);
 321         }
 322         return Optional.fromNullable(externalTunnelList);
 323     }
 324
 325     public static InstanceIdentifier<DcGatewayIpList> getDcGatewayIpListIdentifier() {
 326         return InstanceIdentifier
 327                 .builder(DcGatewayIpList.class).build();
 328     }
 329
 330     public Optional<DcGatewayIpList> getDcGatewayIpList() {
 331         InstanceIdentifier<DcGatewayIpList> dcGatewayIpListInstanceIdentifier = getDcGatewayIpListIdentifier();
 332         DcGatewayIpList dcGatewayIpListConfig = null;
 333         try {
 334             dcGatewayIpListConfig = elanUtils.read2(LogicalDatastoreType.CONFIGURATION,
 335                     dcGatewayIpListInstanceIdentifier).orNull();
 336         } catch (ReadFailedException e) {
 337             LOG.error("getDcGatewayTunnelInterfaceNameList: unable to read DcGatewayTunnelList, exception ", e);
 338         }
 339         return Optional.fromNullable(dcGatewayIpListConfig);
 340     }
 341
 342     public List<String> getDcGatewayTunnelInterfaceNameList() {
 343         final List<String> tunnelInterfaceNameList = new ArrayList<>();
 344         Optional<DcGatewayIpList> dcGatewayIpListOptional = getDcGatewayIpList();
 345         if (!dcGatewayIpListOptional.isPresent()) {
 346             LOG.info("No DC gateways configured while programming the l2vni table.");
 347             return tunnelInterfaceNameList;
 348         }
 349         List<DcGatewayIp> dcGatewayIps = dcGatewayIpListOptional.get().getDcGatewayIp();
 350
 351         Optional<ExternalTunnelList> externalTunnelListOptional = getExternalTunnelList();
 352         if (!externalTunnelListOptional.isPresent()) {
 353             LOG.info("No External Tunnel Configured while programming the l2vni table.");
 354             return tunnelInterfaceNameList;
 355         }
 356         List<ExternalTunnel> externalTunnels = externalTunnelListOptional.get().getExternalTunnel();
 357
 358         dcGatewayIps
 359                 .forEach(dcIp -> externalTunnels
 360                 .stream()
 361                 .filter(externalTunnel -> externalTunnel.getDestinationDevice()
 362                         .contains(dcIp.getIpAddress().getIpv4Address().toString()))
 363                 .forEach(externalTunnel -> tunnelInterfaceNameList.add(externalTunnel.getTunnelInterfaceName())));
 364
 365         return tunnelInterfaceNameList;
 366     }
 367
 368     public void bindElanServiceToExternalTunnel(String elanName, String interfaceName) {
 369         ListenableFutures.addErrorLogging(txRunner.callWithNewReadWriteTransactionAndSubmit(CONFIGURATION, tx -> {
 370             int instructionKey = 0;
 371             LOG.trace("Binding external interface {} elan {}", interfaceName, elanName);
 372             List<Instruction> instructions = new ArrayList<>();
 373             instructions.add(MDSALUtil.buildAndGetGotoTableInstruction(
 374                     NwConstants.L2VNI_EXTERNAL_TUNNEL_DEMUX_TABLE, ++instructionKey));
 375             short elanServiceIndex =
 376                     ServiceIndex.getIndex(NwConstants.ELAN_SERVICE_NAME, NwConstants.ELAN_SERVICE_INDEX);
 377             BoundServices serviceInfo = ElanUtils.getBoundServices(
 378                     ElanUtils.getElanServiceName(elanName, interfaceName), elanServiceIndex,
 379                     NwConstants.ELAN_SERVICE_INDEX, NwConstants.COOKIE_ELAN_INGRESS_TABLE, instructions);
 380             InstanceIdentifier<BoundServices> bindServiceId = ElanUtils.buildServiceId(interfaceName, elanServiceIndex);
 381             if (!tx.read(bindServiceId).get().isPresent()) {
 382                 tx.put(bindServiceId, serviceInfo, WriteTransaction.CREATE_MISSING_PARENTS);
 383             }
 384         }), LOG, "Error binding an ELAN service to an external tunnel");
 385     }
 386
 387     public void unbindElanServiceFromExternalTunnel(String elanName, String interfaceName) {
 388         ListenableFutures.addErrorLogging(txRunner.callWithNewReadWriteTransactionAndSubmit(CONFIGURATION, tx -> {
 389             LOG.trace("UnBinding external interface {} elan {}", interfaceManager, elanName);
 390             short elanServiceIndex =
 391                     ServiceIndex.getIndex(NwConstants.ELAN_SERVICE_NAME, NwConstants.ELAN_SERVICE_INDEX);
 392             InstanceIdentifier<BoundServices> bindServiceId = ElanUtils.buildServiceId(interfaceName, elanServiceIndex);
 393             if (tx.read(bindServiceId).get().isPresent()) {
 394                 tx.delete(bindServiceId);
 395             }
 396         }), LOG, "Error binding an ELAN service to an external tunnel");
 397     }
 398
 399     private List<InstructionInfo> getInstructionsForExtTunnelTable(Long elanTag) {
 400         List<InstructionInfo> mkInstructions = new ArrayList<>();
 401         mkInstructions.add(new InstructionWriteMetadata(ElanUtils.getElanMetadataLabel(elanTag, false),
 402                 ElanHelper.getElanMetadataMask()));
 403         mkInstructions.add(new InstructionGotoTable(NwConstants.ELAN_DMAC_TABLE));
 404         return mkInstructions;
 405     }
 406
 407     private String getFlowRef(long tableId, long elanTag, BigInteger dpnId) {
 408         return new StringBuilder().append(tableId).append(elanTag).append(dpnId).toString();
 409     }
 410
 411     private void programEvpnL2vniFlow(ElanInstance elanInfo, BiConsumer<BigInteger, FlowEntity> flowHandler) {
 412         long elanTag = elanInfo.getElanTag();
 413         List<MatchInfo> mkMatches = new ArrayList<>();
 414         mkMatches.add(new MatchTunnelId(BigInteger.valueOf(elanUtils.getVxlanSegmentationId(elanInfo))));
 415         NWUtil.getOperativeDPNs(broker).forEach(dpnId -> {
 416             LOG.debug("Updating tunnel flow to dpnid {}", dpnId);
 417             List<InstructionInfo> instructions = getInstructionsForExtTunnelTable(elanTag);
 418             String flowRef = getFlowRef(NwConstants.L2VNI_EXTERNAL_TUNNEL_DEMUX_TABLE, elanTag, dpnId);
 419             FlowEntity flowEntity = MDSALUtil.buildFlowEntity(
 420                     dpnId,
 421                     NwConstants.L2VNI_EXTERNAL_TUNNEL_DEMUX_TABLE,
 422                     flowRef,
 423                     5, // prio
 424                     elanInfo.getElanInstanceName(), // flowName
 425                     0, // idleTimeout
 426                     0, // hardTimeout
 427                     ITMConstants.COOKIE_ITM_EXTERNAL.add(BigInteger.valueOf(elanTag)),
 428                     mkMatches,
 429                     instructions);
 430             flowHandler.accept(dpnId, flowEntity);
 431         });
 432     }
 433
 434     public void programEvpnL2vniDemuxTable(String elanName, final BiConsumer<String, String> serviceHandler,
 435                                            BiConsumer<BigInteger, FlowEntity> flowHandler) {
 436         ElanInstance elanInfo = elanInstanceCache.get(elanName).orNull();
 437         List<String> tunnelInterfaceNameList = getDcGatewayTunnelInterfaceNameList();
 438         if (tunnelInterfaceNameList.isEmpty()) {
 439             LOG.info("No DC gateways tunnels while programming l2vni table for elan {}.", elanName);
 440             return;
 441         }
 442
 443         tunnelInterfaceNameList.forEach(tunnelInterfaceName -> serviceHandler.accept(elanName, tunnelInterfaceName));
 444         programEvpnL2vniFlow(elanInfo, flowHandler);
 445     }
 446
 447     @SuppressWarnings({ "unchecked", "rawtypes" })
 448     public <T extends DataObject> void asyncReadAndExecute(final LogicalDatastoreType datastoreType,
 449             final InstanceIdentifier<T> iid, final String jobKey, final Function<Optional<T>, Void> function) {
 450         jobCoordinator.enqueueJob(jobKey, () -> {
 451             SettableFuture<Optional<T>> settableFuture = SettableFuture.create();
 452             List futures = Collections.singletonList(settableFuture);
 453
 454             try (ReadOnlyTransaction tx = broker.newReadOnlyTransaction()) {
 455                 Futures.addCallback(tx.read(datastoreType, iid),
 456                         new SettableFutureCallback<Optional<T>>(settableFuture) {
 457                             @Override
 458                             public void onSuccess(Optional<T> data) {
 459                                 function.apply(data);
 460                                 super.onSuccess(data);
 461                             }
 462                         }, MoreExecutors.directExecutor());
 463
 464                 return futures;
 465             }
 466         }, ElanConstants.JOB_MAX_RETRIES);
 467     }
 468 }