| /* |
| * Copyright 2016-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.bmv2.demo.app.ecmp; |
| |
| import com.google.common.collect.ImmutableBiMap; |
| import org.onlab.util.ImmutableByteSequence; |
| import org.onosproject.bmv2.api.context.Bmv2Configuration; |
| import org.onosproject.bmv2.api.context.Bmv2Interpreter; |
| import org.onosproject.bmv2.api.context.Bmv2InterpreterException; |
| import org.onosproject.bmv2.api.runtime.Bmv2Action; |
| import org.onosproject.bmv2.api.utils.Bmv2TranslatorUtils; |
| import org.onosproject.net.PortNumber; |
| import org.onosproject.net.flow.TrafficTreatment; |
| import org.onosproject.net.flow.criteria.Criterion; |
| import org.onosproject.net.flow.instructions.Instruction; |
| |
| import static org.onosproject.bmv2.api.utils.Bmv2TranslatorUtils.fitByteSequence; |
| import static org.onosproject.net.PortNumber.CONTROLLER; |
| import static org.onosproject.net.flow.instructions.Instructions.OutputInstruction; |
| |
| /** |
| * Implementation of a BMv2 interpreter for the ecmp.json configuration. |
| */ |
| public class EcmpInterpreter implements Bmv2Interpreter { |
| |
| protected static final String ECMP_METADATA = "ecmp_metadata"; |
| protected static final String SELECTOR = "selector"; |
| protected static final String GROUP_ID = "groupId"; |
| protected static final String GROUP_SIZE = "groupSize"; |
| protected static final String ECMP_GROUP = "ecmp_group"; |
| protected static final String ECMP_GROUP_TABLE = "ecmp_group_table"; |
| protected static final String TABLE0 = "table0"; |
| protected static final String SEND_TO_CPU = "send_to_cpu"; |
| protected static final String DROP = "_drop"; |
| protected static final String SET_EGRESS_PORT = "set_egress_port"; |
| protected static final String PORT = "port"; |
| |
| private static final ImmutableBiMap<Criterion.Type, String> CRITERION_TYPE_MAP = ImmutableBiMap.of( |
| Criterion.Type.IN_PORT, "standard_metadata.ingress_port", |
| Criterion.Type.ETH_DST, "ethernet.dstAddr", |
| Criterion.Type.ETH_SRC, "ethernet.srcAddr", |
| Criterion.Type.ETH_TYPE, "ethernet.etherType"); |
| |
| private static final ImmutableBiMap<Integer, String> TABLE_ID_MAP = ImmutableBiMap.of( |
| 0, TABLE0, |
| 1, ECMP_GROUP_TABLE); |
| |
| @Override |
| public ImmutableBiMap<Integer, String> tableIdMap() { |
| return TABLE_ID_MAP; |
| } |
| |
| @Override |
| public ImmutableBiMap<Criterion.Type, String> criterionTypeMap() { |
| return CRITERION_TYPE_MAP; |
| } |
| |
| @Override |
| public Bmv2Action mapTreatment(TrafficTreatment treatment, Bmv2Configuration configuration) |
| throws Bmv2InterpreterException { |
| |
| if (treatment.allInstructions().size() == 0) { |
| // No instructions means drop for us. |
| return actionWithName(DROP); |
| } else if (treatment.allInstructions().size() > 1) { |
| // Otherwise, we understand treatments with only 1 instruction. |
| throw new Bmv2InterpreterException("Treatment has multiple instructions"); |
| } |
| |
| Instruction instruction = treatment.allInstructions().get(0); |
| |
| switch (instruction.type()) { |
| case OUTPUT: |
| OutputInstruction outInstruction = (OutputInstruction) instruction; |
| PortNumber port = outInstruction.port(); |
| if (!port.isLogical()) { |
| return buildEgressAction(port, configuration); |
| } else if (port.equals(CONTROLLER)) { |
| return actionWithName(SEND_TO_CPU); |
| } else { |
| throw new Bmv2InterpreterException("Egress on logical port not supported: " + port); |
| } |
| case NOACTION: |
| return actionWithName(DROP); |
| default: |
| throw new Bmv2InterpreterException("Instruction type not supported: " + instruction.type().name()); |
| } |
| } |
| |
| private static Bmv2Action buildEgressAction(PortNumber port, Bmv2Configuration configuration) |
| throws Bmv2InterpreterException { |
| |
| int portBitWidth = configuration.action(SET_EGRESS_PORT).runtimeData(PORT).bitWidth(); |
| |
| try { |
| ImmutableByteSequence portBs = fitByteSequence(ImmutableByteSequence.copyFrom(port.toLong()), portBitWidth); |
| return Bmv2Action.builder() |
| .withName(SET_EGRESS_PORT) |
| .addParameter(portBs) |
| .build(); |
| } catch (Bmv2TranslatorUtils.ByteSequenceFitException e) { |
| throw new Bmv2InterpreterException(e.getMessage()); |
| } |
| } |
| |
| private static Bmv2Action actionWithName(String name) { |
| return Bmv2Action.builder().withName(name).build(); |
| } |
| } |