neutron-vpp-mapper/src/main/java/org/opendaylight/groupbasedpolicy/neutron/vpp/mapper/processors/PortHandler.java

   1 /*\r
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.\r
   3  *\r
   4  * This program and the accompanying materials are made available under the\r
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,\r
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html\r
   7  */\r
   8 \r
   9 package org.opendaylight.groupbasedpolicy.neutron.vpp.mapper.processors;\r
  10 \r
  11 import java.util.Collections;\r
  12 import java.util.List;\r
  13 \r
  14 import javax.annotation.Nullable;\r
  15 \r
  16 import org.opendaylight.controller.md.sal.binding.api.BindingTransactionChain;\r
  17 import org.opendaylight.controller.md.sal.binding.api.DataBroker;\r
  18 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;\r
  19 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;\r
  20 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;\r
  21 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;\r
  22 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;\r
  23 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;\r
  24 import org.opendaylight.groupbasedpolicy.util.DataStoreHelper;\r
  25 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;\r
  26 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;\r
  27 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.PhysAddress;\r
  28 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;\r
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.common.rev140421.UniqueId;\r
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.Mappings;\r
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.mappings.GbpByNeutronMappings;\r
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.mappings.gbp.by.neutron.mappings.BaseEndpointsByPorts;\r
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.mappings.gbp.by.neutron.mappings.base.endpoints.by.ports.BaseEndpointByPort;\r
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.neutron.gbp.mapper.rev150513.mappings.gbp.by.neutron.mappings.base.endpoints.by.ports.BaseEndpointByPortKey;\r
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.Config;\r
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.ExcludeFromPolicy;\r
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.ExcludeFromPolicyBuilder;\r
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.LoopbackCase;\r
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.LoopbackCaseBuilder;\r
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.TapCase;\r
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.TapCaseBuilder;\r
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425._interface.attributes._interface.type.choice.VhostUserCaseBuilder;\r
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.VppEndpoint;\r
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.VppEndpointBuilder;\r
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.VppEndpointKey;\r
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.binding.rev150712.PortBindingExtension;\r
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.binding.rev150712.binding.attributes.VifDetails;\r
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.routers.attributes.Routers;\r
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.routers.attributes.routers.Router;\r
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.l3.rev150712.routers.attributes.routers.RouterKey;\r
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.port.attributes.FixedIps;\r
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.Ports;\r
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.ports.Port;\r
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.ports.PortKey;\r
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.rev150712.Neutron;\r
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnets.attributes.Subnets;\r
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnets.attributes.subnets.Subnet;\r
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.subnets.rev150712.subnets.attributes.subnets.SubnetKey;\r
  59 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;\r
  60 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;\r
  61 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.InstanceIdentifierBuilder;\r
  62 import org.slf4j.Logger;\r
  63 import org.slf4j.LoggerFactory;\r
  64 \r
  65 import com.google.common.annotations.VisibleForTesting;\r
  66 import com.google.common.base.Optional;\r
  67 \r
  68 import javax.annotation.Nonnull;\r
  69 public class PortHandler implements TransactionChainListener {\r
  70 \r
  71     private static final Logger LOG = LoggerFactory.getLogger(PortHandler.class);\r
  72 \r
  73     private static final String COMPUTE_OWNER = "compute";\r
  74     private static final String DHCP_OWNER = "dhcp";\r
  75     static final String ROUTER_OWNER = "network:router_interface";\r
  76     private static final String[] SUPPORTED_DEVICE_OWNERS = {COMPUTE_OWNER, DHCP_OWNER, ROUTER_OWNER};\r
  77     private static final String VHOST_USER = "vhostuser";\r
  78     private static final String UNBOUND = "unbound";\r
  79     private static final String VPP_INTERFACE_NAME_PREFIX = "neutron_port_";\r
  80     private static final String TAP_PORT_NAME_PREFIX = "tap";\r
  81     private static final String RT_PORT_NAME_PREFIX = "qr-";\r
  82     private static final String VHOST_SOCKET_KEY = "vhostuser_socket";\r
  83     static final String DEFAULT_NODE = "default";\r
  84 \r
  85     private final NodeId routingNode;\r
  86     private BindingTransactionChain transactionChain;\r
  87     private DataBroker dataBroker;\r
  88 \r
  89     PortHandler(DataBroker dataBroker, NodeId routingNodeId) {\r
  90         this.dataBroker = dataBroker;\r
  91         this.routingNode = routingNodeId;\r
  92         transactionChain = this.dataBroker.createTransactionChain(this);\r
  93     }\r
  94 \r
  95     void processCreated(Port port) {\r
  96         ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
  97         Optional<BaseEndpointByPort> optBaseEpByPort = DataStoreHelper.readFromDs(LogicalDatastoreType.OPERATIONAL,\r
  98                 createBaseEpByPortIid(port.getUuid()), rTx);\r
  99         rTx.close();\r
 100         if (!optBaseEpByPort.isPresent()) {\r
 101             return;\r
 102         }\r
 103         processCreatedData(port, optBaseEpByPort.get());\r
 104     }\r
 105 \r
 106     void processCreated(BaseEndpointByPort bebp) {\r
 107         ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 108         Optional<Port> optPort = DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION,\r
 109                 createPortIid(bebp.getPortId()), rTx);\r
 110         rTx.close();\r
 111         if (!optPort.isPresent()) {\r
 112             return;\r
 113         }\r
 114         processCreatedData(optPort.get(), bebp);\r
 115     }\r
 116 \r
 117     @VisibleForTesting\r
 118     void processCreatedData(Port port, BaseEndpointByPort bebp) {\r
 119         if (isValidVhostUser(port)) {\r
 120             VppEndpoint vppEp = buildVppEndpoint(port, bebp);\r
 121             writeVppEndpoint(createVppEndpointIid(vppEp.getKey()), vppEp);\r
 122             LOG.debug("Created vpp-endpoint {}", vppEp);\r
 123         }\r
 124     }\r
 125 \r
 126     private boolean isValidVhostUser(Port port) {\r
 127         PortBindingExtension portBindingExt = port.getAugmentation(PortBindingExtension.class);\r
 128         if (portBindingExt != null) {\r
 129             String vifType = portBindingExt.getVifType();\r
 130             String deviceOwner = port.getDeviceOwner();\r
 131             if (vifType != null && deviceOwner != null) {\r
 132                 if (vifType.contains(VHOST_USER)) {\r
 133                     for (String supportedDeviceOwner : SUPPORTED_DEVICE_OWNERS) {\r
 134                         if (deviceOwner.contains(supportedDeviceOwner)) {\r
 135                             return true;\r
 136                         }\r
 137                     }\r
 138                 }\r
 139             }\r
 140         }\r
 141         return false;\r
 142     }\r
 143 \r
 144     void processUpdated(Port original, Port delta) {\r
 145         if (!isUpdateNeeded(original, delta)){\r
 146             LOG.trace("Port update skipped, port didn`t change. before {}, after: {}" , original, delta);\r
 147             return;\r
 148         }\r
 149 \r
 150         LOG.trace("Updating port before: {}, after: {}" , original, delta);\r
 151         if (isValidVhostUser(original)) {\r
 152             ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 153             Optional<BaseEndpointByPort> optBebp = DataStoreHelper.readFromDs(LogicalDatastoreType.OPERATIONAL,\r
 154                     createBaseEpByPortIid(original.getUuid()), rTx);\r
 155             rTx.close();\r
 156             if (!optBebp.isPresent()) {\r
 157                 return;\r
 158             }\r
 159             LOG.trace("Updating port - deleting old port {}" , optBebp.get().getPortId());\r
 160             processDeleted(optBebp.get());\r
 161         }\r
 162         LOG.trace("Updating port - creating new port {}" , delta.getUuid());\r
 163         processCreated(delta);\r
 164     }\r
 165 \r
 166     private boolean isUpdateNeeded(final Port oldPort, final Port newPort) {\r
 167         //TODO fix this to better support update of ports for VPP\r
 168         final PortBindingExtension oldPortAugmentation = oldPort.getAugmentation(PortBindingExtension.class);\r
 169         final PortBindingExtension newPortAugmentation = newPort.getAugmentation(PortBindingExtension.class);\r
 170 \r
 171         if (newPortAugmentation == null) {\r
 172             LOG.trace("Port {} is no longer a vhost type port, updating port...");\r
 173             return true;\r
 174         }\r
 175 \r
 176         final String oldDeviceOwner = oldPort.getDeviceOwner();\r
 177         final String oldVifType = oldPortAugmentation.getVifType();\r
 178         final String newDeviceOwner = newPort.getDeviceOwner();\r
 179         final String newVifType = newPortAugmentation.getVifType();\r
 180 \r
 181         // TODO potential bug here\r
 182         // Temporary change for Openstack Mitaka: If old neutron-binding:vif-type is vhost, new one is unbound and\r
 183         // device owner is ROUTER_OWNER, skip update. Openstack (or ml2) sometimes sends router update messages in\r
 184         // incorrect order which causes unwanted port removal\r
 185         if (oldVifType.equals(VHOST_USER) && newVifType.equals(UNBOUND) && oldDeviceOwner != null &&\r
 186                 ROUTER_OWNER.equals(oldDeviceOwner) && ROUTER_OWNER.equals(newDeviceOwner)) {\r
 187             LOG.warn("Port vif-type was updated from vhost to unbound. This update is currently disabled and will be skipped");\r
 188             return false;\r
 189         }\r
 190 \r
 191         if (newVifType != null && !newVifType.equals(oldVifType)) {\r
 192             LOG.trace("Vif type changed, old: {} new {}", oldVifType, newVifType);\r
 193             return true;\r
 194         }\r
 195 \r
 196         final List<VifDetails> vifDetails = oldPortAugmentation.getVifDetails();\r
 197 \r
 198         if (!oldPortAugmentation.getHostId().equals(newPortAugmentation.getHostId()) ||\r
 199             nullToEmpty(vifDetails).size() != nullToEmpty(newPortAugmentation.getVifDetails()).size()) {\r
 200             return true;\r
 201         }\r
 202 \r
 203         for (VifDetails vifDetail : nullToEmpty(vifDetails)) {\r
 204             //check if vhostuser_socket, vhostuser_mode and port_filter are changed\r
 205             if (!newPortAugmentation.getVifDetails().contains(vifDetail))\r
 206                 return true;\r
 207         }\r
 208         return false;\r
 209     }\r
 210 \r
 211     void processDeleted(BaseEndpointByPort bebp) {\r
 212         LOG.trace("Deleting vpp-endpoint by BaseEndpointByPort {}" , bebp);\r
 213         VppEndpointKey vppEpKey = new VppEndpointKey(bebp.getAddress(), bebp.getAddressType(), bebp.getContextId(),\r
 214                 bebp.getContextType());\r
 215         InstanceIdentifier<VppEndpoint> vppEpIid = createVppEndpointIid(vppEpKey);\r
 216         ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 217         Optional<VppEndpoint> readVppEp = DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION, vppEpIid, rTx);\r
 218         rTx.close();\r
 219         if (readVppEp.isPresent()) {\r
 220             writeVppEndpoint(vppEpIid, null);\r
 221             LOG.debug("Deleted vpp-endpoint {}", vppEpKey);\r
 222         }\r
 223     }\r
 224 \r
 225     private synchronized void writeVppEndpoint(InstanceIdentifier<VppEndpoint> vppEpIid, VppEndpoint vppEp) {\r
 226         WriteTransaction wTx = transactionChain.newWriteOnlyTransaction();\r
 227         if (vppEp != null) {\r
 228             wTx.put(LogicalDatastoreType.CONFIGURATION, vppEpIid, vppEp, true);\r
 229         } else {\r
 230             wTx.delete(LogicalDatastoreType.CONFIGURATION, vppEpIid);\r
 231         }\r
 232         wTx.submit();\r
 233     }\r
 234 \r
 235     @VisibleForTesting\r
 236     VppEndpoint buildVppEndpoint(Port port, BaseEndpointByPort bebp) {\r
 237         PortBindingExtension portBinding = port.getAugmentation(PortBindingExtension.class);\r
 238         VppEndpointBuilder vppEpBuilder = new VppEndpointBuilder().setDescription("neutron port")\r
 239             .setContextId(bebp.getContextId())\r
 240             .setContextType(bebp.getContextType())\r
 241             .setAddress(bebp.getAddress())\r
 242             .setAddressType(bebp.getAddressType())\r
 243             .setVppInterfaceName(VPP_INTERFACE_NAME_PREFIX + bebp.getPortId().getValue())\r
 244             .setVppNodeId(new NodeId(portBinding.getHostId()));\r
 245         if (port.getDeviceOwner().contains(COMPUTE_OWNER)) {\r
 246             vppEpBuilder.setInterfaceTypeChoice(\r
 247                 new VhostUserCaseBuilder().setSocket(getSocketFromPortBinding(portBinding)).build());\r
 248         } else if (port.getDeviceOwner().contains(DHCP_OWNER) && port.getMacAddress() != null) {\r
 249             TapCase tapCase = new TapCaseBuilder().setPhysicalAddress(new PhysAddress(port.getMacAddress().getValue()))\r
 250                 .setName(createPortName(port.getUuid()))\r
 251                 .build();\r
 252             vppEpBuilder.setInterfaceTypeChoice(tapCase);\r
 253         } else if (isValidQRouterPort(port)) {\r
 254             TapCase tapCase = new TapCaseBuilder().setPhysicalAddress(new PhysAddress(port.getMacAddress().getValue()))\r
 255                     .setName(createQRouterPortName(port.getUuid()))\r
 256                     .build();\r
 257             vppEpBuilder.setInterfaceTypeChoice(tapCase);\r
 258             vppEpBuilder.addAugmentation(ExcludeFromPolicy.class,\r
 259                     new ExcludeFromPolicyBuilder().setExcludeFromPolicy(true).build());\r
 260         } else if (isValidVppRouterPort(port)) {\r
 261             if (!DEFAULT_NODE.equals(routingNode.getValue())) {\r
 262                 LOG.warn(\r
 263                         "Host-id changed by ODL for port {}. This is a supplementary workaround for choosing a routing node.",\r
 264                         port);\r
 265                 vppEpBuilder.setVppNodeId(routingNode);\r
 266             }\r
 267             vppEpBuilder.addAugmentation(ExcludeFromPolicy.class,\r
 268                     new ExcludeFromPolicyBuilder().setExcludeFromPolicy(true).build());\r
 269             vppEpBuilder.setInterfaceTypeChoice(getLoopbackCase(port));\r
 270         }\r
 271         return vppEpBuilder.build();\r
 272     }\r
 273 \r
 274     private String getSocketFromPortBinding(@Nonnull PortBindingExtension portBindingExtension) {\r
 275         List<VifDetails> vifDetails = nullToEmpty(portBindingExtension.getVifDetails());\r
 276 \r
 277         for (VifDetails detail : vifDetails) {\r
 278             if (VHOST_SOCKET_KEY.equalsIgnoreCase(detail.getDetailsKey())) {\r
 279                 return detail.getValue();\r
 280             }\r
 281         }\r
 282         return null;\r
 283     }\r
 284 \r
 285     private LoopbackCase getLoopbackCase(Port port) {\r
 286         LoopbackCaseBuilder loopbackCase = new LoopbackCaseBuilder()\r
 287             .setPhysAddress(new PhysAddress(port.getMacAddress().getValue()));\r
 288         Optional<FixedIps> fixedIpsOptional = resolveFirstFixedIps(port);\r
 289         if(fixedIpsOptional.isPresent() && fixedIpsOptional.get().getIpAddress() != null){\r
 290             loopbackCase.setIpAddress(fixedIpsOptional.get().getIpAddress());\r
 291             ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 292             Optional<Subnet> subnetOptional =\r
 293                 DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION,\r
 294                     InstanceIdentifier.builder(Neutron.class)\r
 295                         .child(Subnets.class)\r
 296                         .child(Subnet.class, new SubnetKey(fixedIpsOptional.get().getSubnetId()))\r
 297                         .build(), rTx);\r
 298             if (subnetOptional.isPresent()) {\r
 299                 Ipv4Prefix ipv4Prefix = subnetOptional.get().getCidr().getIpv4Prefix();\r
 300                 loopbackCase.setIpPrefix(new IpPrefix(ipv4Prefix));\r
 301             } else {\r
 302                 LOG.warn("IpPrefix for loopback port: {} was not set.", port);\r
 303             }\r
 304             if (loopbackCase.getIpAddress() != null && loopbackCase.getIpPrefix() != null) {\r
 305                 loopbackCase.setBvi(true);\r
 306                 LOG.trace("Creating loopback BVI interface: {} for VPP router port: {}.", loopbackCase, port);\r
 307             }\r
 308 \r
 309         } else {\r
 310             LOG.warn("IpAddress for loopback port: {} was not set.", port);\r
 311         }\r
 312         return loopbackCase.build();\r
 313     }\r
 314 \r
 315     /**\r
 316      * If Qrouter (L3 Agent) is in use, any of Openstack neutron routers is not going be mapped\r
 317      * to ODL neutron.\r
 318      */\r
 319     private boolean isValidQRouterPort(Port port) {\r
 320         Optional<Router> optRouter = getRouterOptional(port);\r
 321         return !optRouter.isPresent() && port.getDeviceOwner().contains(ROUTER_OWNER)\r
 322                 && port.getMacAddress() != null;\r
 323     }\r
 324 \r
 325     private boolean isValidVppRouterPort(Port port) {\r
 326         Optional<Router> optRouter = getRouterOptional(port);\r
 327         return optRouter.isPresent() && port.getDeviceOwner().contains(ROUTER_OWNER)\r
 328             && port.getMacAddress() != null;\r
 329     }\r
 330 \r
 331     private Optional<Router> getRouterOptional(Port port) {\r
 332         ReadOnlyTransaction rTx = transactionChain.newReadOnlyTransaction();\r
 333         InstanceIdentifier<Router> routerIid = InstanceIdentifier.builder(Neutron.class)\r
 334             .child(Routers.class)\r
 335             .child(Router.class, new RouterKey(new Uuid(port.getDeviceId())))\r
 336             .build();\r
 337         Optional<Router> optRouter = DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION, routerIid, rTx);\r
 338         rTx.close();\r
 339         return optRouter;\r
 340     }\r
 341 \r
 342     public static Optional<FixedIps> resolveFirstFixedIps(Port port) {\r
 343         List<FixedIps> fixedIps = port.getFixedIps();\r
 344         if (fixedIps != null && !fixedIps.isEmpty()) {\r
 345             return Optional.of(fixedIps.get(0));\r
 346         }\r
 347         return Optional.absent();\r
 348     }\r
 349 \r
 350     private String createPortName(Uuid portUuid) {\r
 351         String tapPortName;\r
 352         String uuid = portUuid.getValue();\r
 353         if (uuid != null && uuid.length() >= 12) {\r
 354             tapPortName = TAP_PORT_NAME_PREFIX + uuid.substring(0, 11);\r
 355         } else {\r
 356             tapPortName = TAP_PORT_NAME_PREFIX + uuid;\r
 357         }\r
 358         return tapPortName;\r
 359     }\r
 360 \r
 361     private String createQRouterPortName(Uuid portUuid) {\r
 362         String tapPortName;\r
 363         String uuid = portUuid.getValue();\r
 364         if (uuid != null && uuid.length() >= 12) {\r
 365             tapPortName = RT_PORT_NAME_PREFIX + uuid.substring(0, 11);\r
 366         } else {\r
 367             tapPortName = RT_PORT_NAME_PREFIX + uuid;\r
 368         }\r
 369         return tapPortName;\r
 370     }\r
 371 \r
 372     private InstanceIdentifier<VppEndpoint> createVppEndpointIid(VppEndpointKey vppEpKey) {\r
 373         return InstanceIdentifier.builder(Config.class).child(VppEndpoint.class, vppEpKey).build();\r
 374     }\r
 375 \r
 376     private InstanceIdentifier<BaseEndpointByPort> createBaseEpByPortIid(Uuid uuid) {\r
 377         return createBaseEpByPortIid(new UniqueId(uuid.getValue()));\r
 378     }\r
 379 \r
 380     private InstanceIdentifier<BaseEndpointByPort> createBaseEpByPortIid(UniqueId uuid) {\r
 381         return InstanceIdentifier.builder(Mappings.class)\r
 382             .child(GbpByNeutronMappings.class)\r
 383             .child(BaseEndpointsByPorts.class)\r
 384             .child(BaseEndpointByPort.class, new BaseEndpointByPortKey(uuid))\r
 385             .build();\r
 386     }\r
 387 \r
 388     InstanceIdentifier<Port> createWildcartedPortIid() {\r
 389         return portsIid().child(Port.class).build();\r
 390     }\r
 391 \r
 392     private InstanceIdentifier<Port> createPortIid(UniqueId uuid) {\r
 393         return portsIid().child(Port.class, new PortKey(new Uuid(uuid.getValue()))).build();\r
 394     }\r
 395 \r
 396     private InstanceIdentifierBuilder<Ports> portsIid() {\r
 397         return InstanceIdentifier.builder(Neutron.class).child(Ports.class);\r
 398     }\r
 399 \r
 400     @Override\r
 401     public void onTransactionChainFailed(TransactionChain<?, ?> chain, AsyncTransaction<?, ?> transaction,\r
 402             Throwable cause) {\r
 403         LOG.error("Transaction chain failed. {} \nTransaction which caused the chain to fail {}", cause.getMessage(),\r
 404                 transaction, cause);\r
 405         transactionChain.close();\r
 406         transactionChain = dataBroker.createTransactionChain(this);\r
 407     }\r
 408 \r
 409     @Override\r
 410     public void onTransactionChainSuccessful(TransactionChain<?, ?> chain) {\r
 411         LOG.trace("Transaction chain was successful. {}", chain);\r
 412     }\r
 413 \r
 414     private <T> List<T> nullToEmpty(@Nullable List<T> list) {\r
 415         return list == null ? Collections.emptyList() : list;\r
 416     }\r
 417 }\r