Carmelo Cascone | efc0a92 | 2016-06-14 14:32:33 -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.demo.app.ecmp; |
| 18 | |
| 19 | import com.google.common.collect.Maps; |
| 20 | import org.onlab.util.ImmutableByteSequence; |
| 21 | import org.onosproject.bmv2.api.context.Bmv2ActionModel; |
| 22 | import org.onosproject.bmv2.api.runtime.Bmv2Action; |
| 23 | import org.onosproject.bmv2.api.runtime.Bmv2ExtensionTreatment; |
| 24 | import org.onosproject.bmv2.api.utils.Bmv2TranslatorUtils; |
| 25 | import org.onosproject.net.DeviceId; |
| 26 | import org.onosproject.net.PortNumber; |
| 27 | import org.onosproject.net.flow.instructions.ExtensionTreatment; |
| 28 | |
| 29 | import java.util.Map; |
| 30 | import java.util.Set; |
| 31 | |
| 32 | import static org.onosproject.bmv2.api.utils.Bmv2TranslatorUtils.fitByteSequence; |
| 33 | import static org.onosproject.bmv2.demo.app.ecmp.EcmpFabricApp.ECMP_CONTEXT; |
| 34 | import static org.onosproject.bmv2.demo.app.ecmp.EcmpInterpreter.*; |
| 35 | |
| 36 | /** |
| 37 | * Builder of ECMP extension treatments. |
| 38 | */ |
| 39 | public class EcmpGroupTreatmentBuilder { |
| 40 | |
| 41 | private static final Map<DeviceId, Map<Set<PortNumber>, Short>> DEVICE_GROUP_ID_MAP = Maps.newHashMap(); |
| 42 | private int groupId; |
| 43 | private int groupSize; |
| 44 | |
| 45 | /** |
| 46 | * Sets the group ID. |
| 47 | * |
| 48 | * @param groupId an integer value |
| 49 | * @return this |
| 50 | */ |
| 51 | public EcmpGroupTreatmentBuilder withGroupId(int groupId) { |
| 52 | this.groupId = groupId; |
| 53 | return this; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Sets the group size. |
| 58 | * |
| 59 | * @param groupSize an integer value |
| 60 | * @return this |
| 61 | */ |
| 62 | public EcmpGroupTreatmentBuilder withGroupSize(int groupSize) { |
| 63 | this.groupSize = groupSize; |
| 64 | return this; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Returns a new extension treatment. |
| 69 | * |
| 70 | * @return an extension treatment |
| 71 | */ |
| 72 | public ExtensionTreatment build() { |
| 73 | Bmv2ActionModel actionModel = ECMP_CONTEXT.configuration().action(ECMP_GROUP); |
| 74 | int groupIdBitWidth = actionModel.runtimeData(GROUP_ID).bitWidth(); |
| 75 | int groupSizeBitWidth = actionModel.runtimeData(GROUP_SIZE).bitWidth(); |
| 76 | |
| 77 | try { |
| 78 | ImmutableByteSequence groupIdBs = fitByteSequence(ImmutableByteSequence.copyFrom(groupId), groupIdBitWidth); |
| 79 | ImmutableByteSequence groupSizeBs = fitByteSequence(ImmutableByteSequence.copyFrom(groupSize), |
| 80 | groupSizeBitWidth); |
| 81 | |
| 82 | return new Bmv2ExtensionTreatment(Bmv2Action.builder() |
| 83 | .withName(ECMP_GROUP) |
| 84 | .addParameter(groupIdBs) |
| 85 | .addParameter(groupSizeBs) |
| 86 | .build()); |
| 87 | |
| 88 | } catch (Bmv2TranslatorUtils.ByteSequenceFitException e) { |
| 89 | throw new RuntimeException(e); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Returns a group ID for the given device and set of ports. |
| 95 | * |
| 96 | * @param deviceId a device ID |
| 97 | * @param ports a set of ports |
| 98 | * @return an integer value |
| 99 | */ |
| 100 | public static int groupIdOf(DeviceId deviceId, Set<PortNumber> ports) { |
| 101 | DEVICE_GROUP_ID_MAP.putIfAbsent(deviceId, Maps.newHashMap()); |
| 102 | // Counts the number of unique portNumber sets for each deviceId. |
| 103 | // Each distinct set of portNumbers will have a unique ID. |
| 104 | return DEVICE_GROUP_ID_MAP.get(deviceId).computeIfAbsent(ports, (pp) -> |
| 105 | (short) (DEVICE_GROUP_ID_MAP.get(deviceId).size() + 1)); |
| 106 | } |
| 107 | } |