wu | 5f6c5b8 | 2017-08-04 16:45:19 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2017-present Open Networking Foundation |
| 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.pi.demo.app.ecmp; |
| 18 | |
| 19 | import com.google.common.collect.ImmutableBiMap; |
| 20 | import com.google.common.collect.ImmutableList; |
| 21 | import org.onlab.packet.Ethernet; |
| 22 | import org.onlab.util.ImmutableByteSequence; |
| 23 | import org.onosproject.net.ConnectPoint; |
| 24 | import org.onosproject.net.DeviceId; |
| 25 | import org.onosproject.net.Port; |
| 26 | import org.onosproject.net.PortNumber; |
| 27 | import org.onosproject.net.device.DeviceService; |
| 28 | import org.onosproject.net.driver.AbstractHandlerBehaviour; |
| 29 | import org.onosproject.net.flow.TrafficTreatment; |
| 30 | import org.onosproject.net.flow.criteria.Criterion; |
| 31 | import org.onosproject.net.flow.instructions.Instruction; |
| 32 | import org.onosproject.net.flow.instructions.Instructions; |
| 33 | import org.onosproject.net.packet.DefaultInboundPacket; |
| 34 | import org.onosproject.net.packet.InboundPacket; |
| 35 | import org.onosproject.net.packet.OutboundPacket; |
| 36 | import org.onosproject.net.pi.model.PiPipelineInterpreter; |
| 37 | import org.onosproject.net.pi.runtime.PiAction; |
| 38 | import org.onosproject.net.pi.runtime.PiActionId; |
| 39 | import org.onosproject.net.pi.runtime.PiActionParam; |
| 40 | import org.onosproject.net.pi.runtime.PiActionParamId; |
| 41 | import org.onosproject.net.pi.runtime.PiHeaderFieldId; |
| 42 | import org.onosproject.net.pi.runtime.PiPacketMetadata; |
| 43 | import org.onosproject.net.pi.runtime.PiPacketMetadataId; |
| 44 | import org.onosproject.net.pi.runtime.PiPacketOperation; |
| 45 | import org.onosproject.net.pi.runtime.PiTableId; |
| 46 | |
| 47 | import java.nio.ByteBuffer; |
| 48 | import java.util.Collection; |
| 49 | import java.util.List; |
| 50 | import java.util.Optional; |
| 51 | |
| 52 | import static java.util.stream.Collectors.toList; |
| 53 | import static org.onosproject.net.PortNumber.CONTROLLER; |
| 54 | import static org.onosproject.net.PortNumber.FLOOD; |
| 55 | import static org.onosproject.net.flow.instructions.Instruction.Type.OUTPUT; |
| 56 | import static org.onosproject.net.pi.runtime.PiPacketOperation.Type.PACKET_OUT; |
| 57 | |
| 58 | /** |
| 59 | * Implementation of a PiPipeline interpreter for the ecmp.json configuration. |
| 60 | */ |
| 61 | public class EcmpInterpreter extends AbstractHandlerBehaviour implements PiPipelineInterpreter { |
| 62 | |
| 63 | protected static final String ECMP_METADATA_HEADER_NAME = "ecmp_metadata_t"; |
| 64 | protected static final String ECMP_GROUP_ACTION_NAME = "ecmp_group"; |
| 65 | protected static final String GROUP_ID = "group_id"; |
| 66 | protected static final String SELECTOR = "selector"; |
| 67 | protected static final String GROUP_SIZE = "groupSize"; |
| 68 | protected static final String ECMP_GROUP_TABLE = "ecmp_group_table"; |
| 69 | protected static final String TABLE0 = "table0"; |
| 70 | private static final String SEND_TO_CPU = "send_to_cpu"; |
| 71 | private static final String PORT = "port"; |
| 72 | private static final String DROP = "drop"; |
| 73 | private static final String SET_EGRESS_PORT = "set_egress_port"; |
| 74 | private static final String EGRESS_PORT = "egress_port"; |
| 75 | private static final int PORT_NUMBER_BIT_WIDTH = 9; |
| 76 | |
| 77 | private static final PiHeaderFieldId IN_PORT_ID = PiHeaderFieldId.of("standard_metadata", "ingress_port"); |
| 78 | private static final PiHeaderFieldId ETH_DST_ID = PiHeaderFieldId.of("ethernet", "dstAddr"); |
| 79 | private static final PiHeaderFieldId ETH_SRC_ID = PiHeaderFieldId.of("ethernet", "srcAddr"); |
| 80 | private static final PiHeaderFieldId ETH_TYPE_ID = PiHeaderFieldId.of("ethernet", "etherType"); |
| 81 | |
| 82 | private static final ImmutableBiMap<Criterion.Type, PiHeaderFieldId> CRITERION_MAP = |
| 83 | new ImmutableBiMap.Builder<Criterion.Type, PiHeaderFieldId>() |
| 84 | .put(Criterion.Type.IN_PORT, IN_PORT_ID) |
| 85 | .put(Criterion.Type.ETH_DST, ETH_DST_ID) |
| 86 | .put(Criterion.Type.ETH_SRC, ETH_SRC_ID) |
| 87 | .put(Criterion.Type.ETH_TYPE, ETH_TYPE_ID) |
| 88 | .build(); |
| 89 | |
| 90 | private static final ImmutableBiMap<Integer, PiTableId> TABLE_MAP = ImmutableBiMap.of( |
| 91 | 0, PiTableId.of(TABLE0), |
| 92 | 1, PiTableId.of(ECMP_GROUP_TABLE)); |
| 93 | |
| 94 | public static final String INGRESS_PORT = "ingress_port"; |
| 95 | |
| 96 | @Override |
| 97 | public Optional<Integer> mapPiTableId(PiTableId piTableId) { |
| 98 | return Optional.ofNullable(TABLE_MAP.inverse().get(piTableId)); |
| 99 | } |
| 100 | |
| 101 | @Override |
| 102 | public PiAction mapTreatment(TrafficTreatment treatment, PiTableId piTableId) |
| 103 | throws PiInterpreterException { |
| 104 | |
| 105 | if (treatment.allInstructions().size() == 0) { |
| 106 | // No instructions means drop for us. |
| 107 | return actionWithName(DROP); |
| 108 | } else if (treatment.allInstructions().size() > 1) { |
| 109 | // Otherwise, we understand treatments with only 1 instruction. |
| 110 | throw new PiPipelineInterpreter.PiInterpreterException("Treatment has multiple instructions"); |
| 111 | } |
| 112 | |
| 113 | Instruction instruction = treatment.allInstructions().get(0); |
| 114 | |
| 115 | switch (instruction.type()) { |
| 116 | case OUTPUT: |
| 117 | Instructions.OutputInstruction outInstruction = (Instructions.OutputInstruction) instruction; |
| 118 | PortNumber port = outInstruction.port(); |
| 119 | if (!port.isLogical()) { |
| 120 | PiAction.builder() |
| 121 | .withId(PiActionId.of(SET_EGRESS_PORT)) |
| 122 | .withParameter(new PiActionParam(PiActionParamId.of(PORT), |
| 123 | ImmutableByteSequence.copyFrom(port.toLong()))) |
| 124 | .build(); |
| 125 | } else if (port.equals(CONTROLLER)) { |
| 126 | return actionWithName(SEND_TO_CPU); |
| 127 | } else { |
| 128 | throw new PiInterpreterException("Egress on logical port not supported: " + port); |
| 129 | } |
| 130 | case NOACTION: |
| 131 | return actionWithName(DROP); |
| 132 | default: |
| 133 | throw new PiInterpreterException("Instruction type not supported: " + instruction.type().name()); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | private static PiAction actionWithName(String name) { |
| 138 | return PiAction.builder().withId(PiActionId.of(name)).build(); |
| 139 | } |
| 140 | |
| 141 | @Override |
| 142 | public Optional<PiHeaderFieldId> mapCriterionType(Criterion.Type type) { |
| 143 | return Optional.ofNullable(CRITERION_MAP.get(type)); |
| 144 | } |
| 145 | |
| 146 | @Override |
| 147 | public Optional<Criterion.Type> mapPiHeaderFieldId(PiHeaderFieldId headerFieldId) { |
| 148 | return Optional.ofNullable(CRITERION_MAP.inverse().get(headerFieldId)); |
| 149 | } |
| 150 | |
| 151 | @Override |
| 152 | public Optional<PiTableId> mapFlowRuleTableId(int flowRuleTableId) { |
| 153 | return Optional.ofNullable(TABLE_MAP.get(flowRuleTableId)); |
| 154 | } |
| 155 | |
| 156 | @Override |
| 157 | public Collection<PiPacketOperation> mapOutboundPacket(OutboundPacket packet) |
| 158 | throws PiInterpreterException { |
| 159 | TrafficTreatment treatment = packet.treatment(); |
| 160 | |
| 161 | // ecmp.p4 supports only OUTPUT instructions. |
| 162 | List<Instructions.OutputInstruction> outInstructions = treatment.allInstructions() |
| 163 | .stream() |
| 164 | .filter(i -> i.type().equals(OUTPUT)) |
| 165 | .map(i -> (Instructions.OutputInstruction) i) |
| 166 | .collect(toList()); |
| 167 | |
| 168 | if (treatment.allInstructions().size() != outInstructions.size()) { |
| 169 | // There are other instructions that are not of type OUTPUT |
| 170 | throw new PiInterpreterException("Treatment not supported: " + treatment); |
| 171 | } |
| 172 | |
| 173 | ImmutableList.Builder<PiPacketOperation> builder = ImmutableList.builder(); |
| 174 | for (Instructions.OutputInstruction outInst : outInstructions) { |
| 175 | if (outInst.port().isLogical() && !outInst.port().equals(FLOOD)) { |
| 176 | throw new PiInterpreterException("Logical port not supported: " + |
| 177 | outInst.port()); |
| 178 | } else if (outInst.port().equals(FLOOD)) { |
| 179 | //Since ecmp.p4 does not support flood for each port of the device |
| 180 | // create a packet operation to send the packet out of that specific port |
| 181 | for (Port port : handler().get(DeviceService.class).getPorts(packet.sendThrough())) { |
| 182 | builder.add(createPiPacketOperation(packet.data(), port.number().toLong())); |
| 183 | } |
| 184 | } else { |
| 185 | builder.add(createPiPacketOperation(packet.data(), outInst.port().toLong())); |
| 186 | } |
| 187 | } |
| 188 | return builder.build(); |
| 189 | } |
| 190 | |
| 191 | private PiPacketOperation createPiPacketOperation(ByteBuffer data, long portNumber) throws PiInterpreterException { |
| 192 | //create the metadata |
| 193 | PiPacketMetadata metadata = createPacketMetadata(portNumber); |
| 194 | |
| 195 | //Create the Packet operation |
| 196 | return PiPacketOperation.builder() |
| 197 | .withType(PACKET_OUT) |
| 198 | .withData(ImmutableByteSequence.copyFrom(data)) |
| 199 | .withMetadatas(ImmutableList.of(metadata)) |
| 200 | .build(); |
| 201 | } |
| 202 | |
| 203 | private PiPacketMetadata createPacketMetadata(long portNumber) throws PiInterpreterException { |
| 204 | ImmutableByteSequence portValue = ImmutableByteSequence.copyFrom(portNumber); |
| 205 | //FIXME remove hardcoded bitWidth and retrieve it from pipelineModel |
| 206 | try { |
| 207 | portValue = ImmutableByteSequence.fit(portValue, PORT_NUMBER_BIT_WIDTH); |
| 208 | } catch (ImmutableByteSequence.ByteSequenceTrimException e) { |
| 209 | throw new PiInterpreterException("Port number too big: {}" + |
| 210 | portNumber + " causes " + e.getMessage()); |
| 211 | } |
| 212 | return PiPacketMetadata.builder() |
| 213 | .withId(PiPacketMetadataId.of(EGRESS_PORT)) |
| 214 | .withValue(portValue) |
| 215 | .build(); |
| 216 | } |
| 217 | |
| 218 | @Override |
| 219 | public InboundPacket mapInboundPacket(DeviceId deviceId, PiPacketOperation packetInOperation) |
| 220 | throws PiInterpreterException { |
| 221 | //We are assuming that the packet is ethernet type |
| 222 | Ethernet ethPkt = new Ethernet(); |
| 223 | |
| 224 | ethPkt.deserialize(packetInOperation.data().asArray(), 0, packetInOperation.data().size()); |
| 225 | |
| 226 | //Returns the ingress port packet metadata |
| 227 | Optional<PiPacketMetadata> packetMetadata = packetInOperation.metadatas() |
| 228 | .stream().filter(metadata -> metadata.id().name().equals(INGRESS_PORT)) |
| 229 | .findFirst(); |
| 230 | |
| 231 | if (packetMetadata.isPresent()) { |
| 232 | |
| 233 | //Obtaining the ingress port as an immutable byte sequence |
| 234 | ImmutableByteSequence portByteSequence = packetMetadata.get().value(); |
| 235 | |
| 236 | //Converting immutableByteSequence to short |
| 237 | short s = portByteSequence.asReadOnlyBuffer().getShort(); |
| 238 | |
| 239 | ConnectPoint receivedFrom = new ConnectPoint(deviceId, PortNumber.portNumber(s)); |
| 240 | |
| 241 | //FIXME should be optimizable with .asReadOnlyBytebuffer |
| 242 | ByteBuffer rawData = ByteBuffer.wrap(packetInOperation.data().asArray()); |
| 243 | return new DefaultInboundPacket(receivedFrom, ethPkt, rawData); |
| 244 | |
| 245 | } else { |
| 246 | throw new PiInterpreterException("Can't get packet metadata for" + INGRESS_PORT); |
| 247 | } |
| 248 | } |
| 249 | } |