Frank Wang | d7e3b4b | 2017-09-24 13:37:54 +0900 | [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.net.pi.impl; |
| 18 | |
| 19 | import org.onosproject.net.Device; |
| 20 | import org.onosproject.net.meter.Band; |
| 21 | import org.onosproject.net.meter.Meter; |
| 22 | import org.onosproject.net.pi.model.PiPipeconf; |
| 23 | import org.onosproject.net.pi.runtime.PiMeterBand; |
| 24 | import org.onosproject.net.pi.runtime.PiMeterCellConfig; |
| 25 | import org.onosproject.net.pi.runtime.PiMeterCellId; |
| 26 | import org.onosproject.net.pi.service.PiTranslationException; |
| 27 | |
| 28 | import static org.onosproject.net.meter.MeterCellId.MeterCellType.PIPELINE_INDEPENDENT; |
| 29 | |
| 30 | /** |
| 31 | * Implementation of meter translation logic. |
| 32 | */ |
| 33 | final class PiMeterTranslatorImpl { |
| 34 | |
| 35 | private PiMeterTranslatorImpl() { |
| 36 | // Hides constructor. |
| 37 | } |
| 38 | |
| 39 | private static final int TRTCM_RATES = 2; |
| 40 | |
| 41 | /** |
| 42 | * Returns a PI meter config equivalent to the given meter, for the given pipeconf and device. |
| 43 | * |
| 44 | * @param meter meter |
| 45 | * @param pipeconf pipeconf |
| 46 | * @param device device |
| 47 | * @return PI meter configs |
| 48 | * @throws PiTranslationException if the meter cannot be translated |
| 49 | */ |
| 50 | static PiMeterCellConfig translate(Meter meter, PiPipeconf pipeconf, Device device) throws PiTranslationException { |
| 51 | |
| 52 | if (meter.meterCellId().type() != PIPELINE_INDEPENDENT) { |
| 53 | throw new PiTranslationException("PI meter cell type must be PIPELINE_INDEPENDENT!"); |
| 54 | } |
| 55 | |
| 56 | // FIXME: we might want to move this check to P4Runtime driver or protocol layer. |
| 57 | // In general, This check is more of P4Runtime limitation, we should do this check in the low level layer. |
| 58 | if (meter.bands().size() > TRTCM_RATES) { |
| 59 | throw new PiTranslationException("PI meter can not have more than 2 bands!"); |
| 60 | } |
| 61 | |
| 62 | |
| 63 | PiMeterCellConfig.Builder builder = PiMeterCellConfig.builder(); |
| 64 | for (Band band : meter.bands()) { |
| 65 | if (band.type() != Band.Type.NONE) { |
| 66 | throw new PiTranslationException("PI meter can not have band with other types except NONE!"); |
| 67 | } |
| 68 | |
| 69 | PiMeterBand piMeterBand = new PiMeterBand(band.rate(), band.burst()); |
| 70 | builder.withMeterBand(piMeterBand); |
| 71 | } |
| 72 | |
| 73 | return builder.withMeterCellId((PiMeterCellId) meter.meterCellId()).build(); |
| 74 | } |
| 75 | } |