Carmelo Cascone | 17fc9e4 | 2016-05-31 11:29:21 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016-present Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.bmv2.ctl; |
| 18 | |
| 19 | import com.google.common.collect.ImmutableBiMap; |
| 20 | import org.onlab.util.ImmutableByteSequence; |
| 21 | import org.onosproject.bmv2.api.context.Bmv2Configuration; |
| 22 | import org.onosproject.bmv2.api.context.Bmv2Interpreter; |
| 23 | import org.onosproject.bmv2.api.context.Bmv2InterpreterException; |
| 24 | import org.onosproject.bmv2.api.runtime.Bmv2Action; |
| 25 | import org.onosproject.bmv2.api.utils.Bmv2TranslatorUtils; |
| 26 | import org.onosproject.net.flow.TrafficTreatment; |
| 27 | import org.onosproject.net.flow.criteria.Criterion; |
| 28 | import org.onosproject.net.flow.instructions.Instruction; |
| 29 | |
| 30 | import static org.onosproject.net.PortNumber.CONTROLLER; |
| 31 | import static org.onosproject.net.flow.instructions.Instructions.OutputInstruction; |
| 32 | |
| 33 | /** |
| 34 | * Implementation of a BMv2 interpreter for the BMv2 default.json configuration. |
| 35 | */ |
| 36 | public final class Bmv2DefaultInterpreterImpl implements Bmv2Interpreter { |
| 37 | |
| 38 | public static final String TABLE0 = "table0"; |
| 39 | public static final String SEND_TO_CPU = "send_to_cpu"; |
| 40 | public static final String DROP = "_drop"; |
| 41 | public static final String SET_EGRESS_PORT = "set_egress_port"; |
| 42 | |
| 43 | // Lazily populate field map. |
| 44 | private static final ImmutableBiMap<Criterion.Type, String> CRITERION_MAP = ImmutableBiMap.of( |
| 45 | Criterion.Type.IN_PORT, "standard_metadata.ingress_port", |
| 46 | Criterion.Type.ETH_DST, "ethernet.dstAddr", |
| 47 | Criterion.Type.ETH_SRC, "ethernet.srcAddr", |
| 48 | Criterion.Type.ETH_TYPE, "ethernet.etherType"); |
| 49 | |
| 50 | private static final ImmutableBiMap<Integer, String> TABLE_MAP = ImmutableBiMap.of( |
| 51 | 0, TABLE0); |
| 52 | |
| 53 | @Override |
| 54 | public ImmutableBiMap<Criterion.Type, String> criterionTypeMap() { |
| 55 | return CRITERION_MAP; |
| 56 | } |
| 57 | |
| 58 | @Override |
| 59 | public ImmutableBiMap<Integer, String> tableIdMap() { |
| 60 | return TABLE_MAP; |
| 61 | } |
| 62 | |
| 63 | @Override |
| 64 | public Bmv2Action mapTreatment(TrafficTreatment treatment, Bmv2Configuration configuration) |
| 65 | throws Bmv2InterpreterException { |
| 66 | |
| 67 | |
| 68 | if (treatment.allInstructions().size() == 0) { |
| 69 | // No instructions means drop for us. |
| 70 | return Bmv2Action.builder().withName(DROP).build(); |
| 71 | } else if (treatment.allInstructions().size() > 1) { |
| 72 | // Otherwise, we understand treatments with only 1 instruction. |
| 73 | throw new Bmv2InterpreterException("Treatment has multiple instructions"); |
| 74 | } |
| 75 | |
| 76 | Instruction instruction = treatment.allInstructions().get(0); |
| 77 | |
| 78 | switch (instruction.type()) { |
| 79 | case OUTPUT: |
| 80 | OutputInstruction outInstruction = (OutputInstruction) instruction; |
| 81 | if (outInstruction.port() == CONTROLLER) { |
| 82 | return Bmv2Action.builder().withName(SEND_TO_CPU).build(); |
| 83 | } else { |
| 84 | return buildEgressAction(outInstruction, configuration); |
| 85 | } |
| 86 | case NOACTION: |
| 87 | return Bmv2Action.builder().withName(DROP).build(); |
| 88 | default: |
| 89 | throw new Bmv2InterpreterException("Instruction type not supported: " + instruction.type().name()); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | |
| 94 | /** |
| 95 | * Builds an egress action equivalent to the given output instruction for the given configuration. |
| 96 | * |
| 97 | * @param instruction an output instruction |
| 98 | * @param configuration a configuration |
| 99 | * @return a BMv2 action |
| 100 | * @throws Bmv2InterpreterException if the instruction cannot be translated to a BMv2 action |
| 101 | */ |
| 102 | private Bmv2Action buildEgressAction(OutputInstruction instruction, Bmv2Configuration configuration) |
| 103 | throws Bmv2InterpreterException { |
| 104 | |
| 105 | Bmv2Action.Builder actionBuilder = Bmv2Action.builder(); |
| 106 | |
| 107 | actionBuilder.withName(SET_EGRESS_PORT); |
| 108 | |
| 109 | if (instruction.port().isLogical()) { |
| 110 | throw new Bmv2InterpreterException("Output on logic port not supported: " + instruction); |
| 111 | } |
| 112 | |
| 113 | // Get the byte sequence for the out port with the right length |
| 114 | long portNumber = instruction.port().toLong(); |
| 115 | int bitWidth = configuration.action(SET_EGRESS_PORT).runtimeData("port").bitWidth(); |
| 116 | try { |
| 117 | ImmutableByteSequence outPort = Bmv2TranslatorUtils.fitByteSequence( |
| 118 | ImmutableByteSequence.copyFrom(portNumber), bitWidth); |
| 119 | return Bmv2Action.builder().withName(SET_EGRESS_PORT).addParameter(outPort).build(); |
| 120 | } catch (Bmv2TranslatorUtils.ByteSequenceFitException e) { |
| 121 | throw new Bmv2InterpreterException(e.getMessage()); |
| 122 | } |
| 123 | } |
| 124 | } |