| /* |
| * Copyright 2017-present Open Networking Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.onosproject.pi.demo.app.ecmp; |
| |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Maps; |
| import org.apache.commons.lang3.tuple.Pair; |
| import org.apache.felix.scr.annotations.Component; |
| import org.onlab.util.ImmutableByteSequence; |
| import org.onosproject.net.DeviceId; |
| import org.onosproject.net.Host; |
| import org.onosproject.net.Path; |
| import org.onosproject.net.Port; |
| import org.onosproject.net.PortNumber; |
| import org.onosproject.net.flow.DefaultTrafficSelector; |
| import org.onosproject.net.flow.DefaultTrafficTreatment; |
| import org.onosproject.net.flow.FlowRule; |
| import org.onosproject.net.flow.TrafficSelector; |
| import org.onosproject.net.flow.TrafficTreatment; |
| import org.onosproject.net.flow.criteria.Criterion; |
| import org.onosproject.net.flow.criteria.PiCriterion; |
| import org.onosproject.net.pi.runtime.PiAction; |
| import org.onosproject.net.pi.runtime.PiActionParam; |
| import org.onosproject.net.pi.runtime.PiTableAction; |
| import org.onosproject.net.topology.DefaultTopologyVertex; |
| import org.onosproject.net.topology.Topology; |
| import org.onosproject.net.topology.TopologyGraph; |
| import org.onosproject.pi.demo.app.common.AbstractUpgradableFabricApp; |
| import org.onosproject.pipelines.basic.PipeconfLoader; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| |
| import static java.lang.String.format; |
| import static java.util.Collections.singleton; |
| import static java.util.stream.Collectors.toSet; |
| import static org.onlab.packet.EthType.EtherType.IPV4; |
| import static org.onosproject.pipelines.basic.BasicConstants.ACT_PRM_NEXT_HOP_ID; |
| import static org.onosproject.pipelines.basic.BasicConstants.ACT_SET_NEXT_HOP_ID; |
| import static org.onosproject.pipelines.basic.BasicConstants.HDR_NEXT_HOP_ID; |
| import static org.onosproject.pipelines.basic.BasicConstants.HDR_SELECTOR_ID; |
| import static org.onosproject.pipelines.basic.BasicConstants.TBL_TABLE0_ID; |
| import static org.onosproject.pipelines.basic.EcmpConstants.TBL_ECMP_TABLE_ID; |
| |
| |
| /** |
| * Implementation of an upgradable fabric app for the ECMP pipeconf. |
| */ |
| @Component(immediate = true) |
| public class EcmpFabricApp extends AbstractUpgradableFabricApp { |
| |
| private static final String APP_NAME = "org.onosproject.pi-ecmp"; |
| |
| private static final Map<DeviceId, Map<Set<PortNumber>, Short>> DEVICE_GROUP_ID_MAP = Maps.newHashMap(); |
| |
| public EcmpFabricApp() { |
| super(APP_NAME, singleton(PipeconfLoader.ECMP_PIPECONF)); |
| } |
| |
| @Override |
| public boolean initDevice(DeviceId deviceId) { |
| // Nothing to do. |
| return true; |
| } |
| |
| @Override |
| public List<FlowRule> generateLeafRules(DeviceId leaf, Host srcHost, Collection<Host> dstHosts, |
| Collection<DeviceId> availableSpines, Topology topo) |
| throws FlowRuleGeneratorException { |
| |
| // Get ports which connect this leaf switch to hosts. |
| Set<PortNumber> hostPorts = deviceService.getPorts(leaf) |
| .stream() |
| .filter(port -> !isFabricPort(port, topo)) |
| .map(Port::number) |
| .collect(Collectors.toSet()); |
| |
| // Get ports which connect this leaf to the given available spines. |
| TopologyGraph graph = topologyService.getGraph(topo); |
| Set<PortNumber> fabricPorts = graph.getEdgesFrom(new DefaultTopologyVertex(leaf)) |
| .stream() |
| .filter(e -> availableSpines.contains(e.dst().deviceId())) |
| .map(e -> e.link().src().port()) |
| .collect(Collectors.toSet()); |
| |
| if (hostPorts.size() != 1 || fabricPorts.size() == 0) { |
| log.error("Leaf switch has invalid port configuration: hostPorts={}, fabricPorts={}", |
| hostPorts.size(), fabricPorts.size()); |
| throw new FlowRuleGeneratorException(); |
| } |
| PortNumber hostPort = hostPorts.iterator().next(); |
| |
| List<FlowRule> rules = Lists.newArrayList(); |
| |
| TrafficTreatment treatment; |
| if (fabricPorts.size() > 1) { |
| // Do ECMP. |
| Pair<PiTableAction, List<FlowRule>> result = provisionEcmpPiTableAction(leaf, fabricPorts); |
| rules.addAll(result.getRight()); |
| treatment = DefaultTrafficTreatment.builder().piTableAction(result.getLeft()).build(); |
| } else { |
| // Output on port. |
| PortNumber outPort = fabricPorts.iterator().next(); |
| treatment = DefaultTrafficTreatment.builder().setOutput(outPort).build(); |
| } |
| |
| // From srHost to dstHosts. |
| for (Host dstHost : dstHosts) { |
| FlowRule rule = flowRuleBuilder(leaf, TBL_TABLE0_ID) |
| .withSelector( |
| DefaultTrafficSelector.builder() |
| .matchInPort(hostPort) |
| .matchEthType(IPV4.ethType().toShort()) |
| .matchEthSrc(srcHost.mac()) |
| .matchEthDst(dstHost.mac()) |
| .build()) |
| .withTreatment(treatment) |
| .build(); |
| rules.add(rule); |
| } |
| |
| // From fabric ports to this leaf host. |
| for (PortNumber port : fabricPorts) { |
| FlowRule rule = flowRuleBuilder(leaf, TBL_TABLE0_ID) |
| .withSelector( |
| DefaultTrafficSelector.builder() |
| .matchInPort(port) |
| .matchEthType(IPV4.ethType().toShort()) |
| .matchEthDst(srcHost.mac()) |
| .build()) |
| .withTreatment( |
| DefaultTrafficTreatment.builder() |
| .setOutput(hostPort) |
| .build()) |
| .build(); |
| rules.add(rule); |
| } |
| |
| return rules; |
| } |
| |
| @Override |
| public List<FlowRule> generateSpineRules(DeviceId deviceId, Collection<Host> dstHosts, Topology topo) |
| throws FlowRuleGeneratorException { |
| |
| List<FlowRule> rules = Lists.newArrayList(); |
| |
| // for each host |
| for (Host dstHost : dstHosts) { |
| |
| Set<Path> paths = topologyService.getPaths(topo, deviceId, dstHost.location().deviceId()); |
| |
| if (paths.size() == 0) { |
| log.warn("Can't find any path between spine {} and host {}", deviceId, dstHost); |
| throw new FlowRuleGeneratorException(); |
| } |
| |
| TrafficTreatment treatment; |
| |
| if (paths.size() == 1) { |
| // Only one path, do output on port. |
| PortNumber port = paths.iterator().next().src().port(); |
| treatment = DefaultTrafficTreatment.builder().setOutput(port).build(); |
| } else { |
| // Multiple paths, do ECMP. |
| Set<PortNumber> portNumbers = paths.stream().map(p -> p.src().port()).collect(toSet()); |
| Pair<PiTableAction, List<FlowRule>> result = provisionEcmpPiTableAction(deviceId, portNumbers); |
| rules.addAll(result.getRight()); |
| treatment = DefaultTrafficTreatment.builder().piTableAction(result.getLeft()).build(); |
| } |
| |
| FlowRule rule = flowRuleBuilder(deviceId, TBL_TABLE0_ID) |
| .withSelector( |
| DefaultTrafficSelector.builder() |
| .matchEthType(IPV4.ethType().toShort()) |
| .matchEthDst(dstHost.mac()) |
| .build()) |
| .withTreatment(treatment) |
| .build(); |
| |
| rules.add(rule); |
| } |
| |
| return rules; |
| } |
| |
| private Pair<PiTableAction, List<FlowRule>> provisionEcmpPiTableAction(DeviceId deviceId, |
| Set<PortNumber> fabricPorts) |
| throws FlowRuleGeneratorException { |
| |
| // Install ECMP group table entries that map from hash values to actual fabric ports... |
| int groupId = groupIdOf(deviceId, fabricPorts); |
| if (fabricPorts.size() != HASHED_LINKS) { |
| throw new FlowRuleGeneratorException(format( |
| "Invalid number of fabric ports for %s, expected %d but found %d", |
| deviceId, HASHED_LINKS, fabricPorts.size())); |
| } |
| Iterator<PortNumber> portIterator = fabricPorts.iterator(); |
| List<FlowRule> rules = Lists.newArrayList(); |
| for (short i = 0; i < HASHED_LINKS; i++) { |
| FlowRule rule = flowRuleBuilder(deviceId, TBL_ECMP_TABLE_ID) |
| .withSelector( |
| buildEcmpTrafficSelector(groupId, i)) |
| .withTreatment( |
| DefaultTrafficTreatment.builder() |
| .setOutput(portIterator.next()) |
| .build()) |
| .build(); |
| rules.add(rule); |
| } |
| |
| PiTableAction piTableAction = buildEcmpPiTableAction(groupId); |
| |
| return Pair.of(piTableAction, rules); |
| } |
| |
| private PiTableAction buildEcmpPiTableAction(int groupId) { |
| |
| return PiAction.builder() |
| .withId(ACT_SET_NEXT_HOP_ID) |
| .withParameter(new PiActionParam(ACT_PRM_NEXT_HOP_ID, |
| ImmutableByteSequence.copyFrom(groupId))) |
| .build(); |
| } |
| |
| private TrafficSelector buildEcmpTrafficSelector(int groupId, int selector) { |
| Criterion ecmpCriterion = PiCriterion.builder() |
| .matchExact(HDR_NEXT_HOP_ID, groupId) |
| .matchExact(HDR_SELECTOR_ID, selector) |
| .build(); |
| |
| return DefaultTrafficSelector.builder() |
| .matchPi((PiCriterion) ecmpCriterion) |
| .build(); |
| } |
| |
| private int groupIdOf(DeviceId deviceId, Set<PortNumber> ports) { |
| DEVICE_GROUP_ID_MAP.putIfAbsent(deviceId, Maps.newHashMap()); |
| // Counts the number of unique portNumber sets for each deviceId. |
| // Each distinct set of portNumbers will have a unique ID. |
| return DEVICE_GROUP_ID_MAP.get(deviceId).computeIfAbsent(ports, (pp) -> |
| (short) (DEVICE_GROUP_ID_MAP.get(deviceId).size() + 1)); |
| } |
| } |