Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2017-present Open Networking Foundation |
Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 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 com.google.common.collect.Maps; |
| 20 | import com.google.common.collect.Sets; |
| 21 | import org.onlab.util.ImmutableByteSequence; |
| 22 | import org.onosproject.net.Device; |
| 23 | import org.onosproject.net.flow.FlowRule; |
| 24 | import org.onosproject.net.flow.IndexTableId; |
| 25 | import org.onosproject.net.flow.TrafficSelector; |
| 26 | import org.onosproject.net.flow.TrafficTreatment; |
| 27 | import org.onosproject.net.flow.criteria.Criterion; |
| 28 | import org.onosproject.net.flow.criteria.PiCriterion; |
| 29 | import org.onosproject.net.flow.instructions.Instruction; |
| 30 | import org.onosproject.net.flow.instructions.PiInstruction; |
| 31 | import org.onosproject.net.pi.model.PiActionModel; |
| 32 | import org.onosproject.net.pi.model.PiActionParamModel; |
| 33 | import org.onosproject.net.pi.model.PiPipeconf; |
| 34 | import org.onosproject.net.pi.model.PiPipelineInterpreter; |
| 35 | import org.onosproject.net.pi.model.PiPipelineModel; |
| 36 | import org.onosproject.net.pi.model.PiTableMatchFieldModel; |
| 37 | import org.onosproject.net.pi.model.PiTableModel; |
| 38 | import org.onosproject.net.pi.runtime.PiAction; |
| 39 | import org.onosproject.net.pi.runtime.PiActionParam; |
| 40 | import org.onosproject.net.pi.runtime.PiExactFieldMatch; |
| 41 | import org.onosproject.net.pi.runtime.PiFieldMatch; |
| 42 | import org.onosproject.net.pi.runtime.PiHeaderFieldId; |
| 43 | import org.onosproject.net.pi.runtime.PiLpmFieldMatch; |
Carmelo Cascone | 0e896a0 | 2017-07-31 07:22:27 +0200 | [diff] [blame] | 44 | import org.onosproject.net.pi.runtime.PiMatchKey; |
Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 45 | import org.onosproject.net.pi.runtime.PiRangeFieldMatch; |
| 46 | import org.onosproject.net.pi.runtime.PiTableAction; |
| 47 | import org.onosproject.net.pi.runtime.PiTableEntry; |
| 48 | import org.onosproject.net.pi.runtime.PiTableId; |
| 49 | import org.onosproject.net.pi.runtime.PiTernaryFieldMatch; |
| 50 | import org.slf4j.Logger; |
| 51 | import org.slf4j.LoggerFactory; |
| 52 | |
| 53 | import java.util.Collection; |
| 54 | import java.util.Map; |
| 55 | import java.util.Optional; |
| 56 | import java.util.Set; |
| 57 | import java.util.StringJoiner; |
| 58 | |
| 59 | import static java.lang.String.format; |
| 60 | import static org.onlab.util.ImmutableByteSequence.ByteSequenceTrimException; |
| 61 | import static org.onlab.util.ImmutableByteSequence.fit; |
| 62 | import static org.onosproject.net.flow.criteria.Criterion.Type.PROTOCOL_INDEPENDENT; |
| 63 | import static org.onosproject.net.pi.impl.CriterionTranslatorHelper.translateCriterion; |
| 64 | import static org.onosproject.net.pi.runtime.PiFlowRuleTranslationService.PiFlowRuleTranslationException; |
| 65 | |
| 66 | /** |
| 67 | * Implementation of flow rule translation logic. |
| 68 | */ |
| 69 | final class PiFlowRuleTranslator { |
| 70 | |
| 71 | private static final Logger log = LoggerFactory.getLogger(PiFlowRuleTranslationServiceImpl.class); |
| 72 | |
| 73 | private PiFlowRuleTranslator() { |
| 74 | // Hide constructor. |
| 75 | } |
| 76 | |
| 77 | static PiTableEntry translateFlowRule(FlowRule rule, PiPipeconf pipeconf, Device device) |
| 78 | throws PiFlowRuleTranslationException { |
| 79 | |
| 80 | PiPipelineModel pipelineModel = pipeconf.pipelineModel(); |
| 81 | |
| 82 | // Retrieve interpreter, if any. |
| 83 | // FIXME: get interpreter via driver once implemented. |
| 84 | // final PiPipelineInterpreter interpreter = device.is(PiPipelineInterpreter.class) |
| 85 | // ? device.as(PiPipelineInterpreter.class) : null; |
| 86 | |
| 87 | final PiPipelineInterpreter interpreter; |
| 88 | try { |
| 89 | interpreter = (PiPipelineInterpreter) pipeconf.implementation(PiPipelineInterpreter.class) |
| 90 | .orElse(null) |
| 91 | .newInstance(); |
| 92 | } catch (InstantiationException | IllegalAccessException e) { |
| 93 | throw new PiFlowRuleTranslationException(format( |
| 94 | "Unable to instantiate interpreter of pipeconf %s", pipeconf.id())); |
| 95 | } |
| 96 | |
| 97 | PiTableId piTableId; |
| 98 | switch (rule.table().type()) { |
| 99 | case PIPELINE_INDEPENDENT: |
| 100 | piTableId = (PiTableId) rule.table(); |
| 101 | break; |
| 102 | case INDEX: |
| 103 | IndexTableId indexId = (IndexTableId) rule.table(); |
| 104 | if (interpreter == null) { |
| 105 | throw new PiFlowRuleTranslationException(format( |
| 106 | "Unable to map table ID '%d' from index to PI: missing interpreter", indexId.id())); |
| 107 | } else if (!interpreter.mapFlowRuleTableId(indexId.id()).isPresent()) { |
| 108 | throw new PiFlowRuleTranslationException(format( |
| 109 | "Unable to map table ID '%d' from index to PI: missing ID in interpreter", indexId.id())); |
| 110 | } else { |
| 111 | piTableId = interpreter.mapFlowRuleTableId(indexId.id()).get(); |
| 112 | } |
| 113 | break; |
| 114 | default: |
| 115 | throw new PiFlowRuleTranslationException(format( |
| 116 | "Unrecognized table ID type %s", rule.table().type().name())); |
| 117 | } |
| 118 | |
| 119 | PiTableModel table = pipelineModel.table(piTableId.toString()) |
| 120 | .orElseThrow(() -> new PiFlowRuleTranslationException(format( |
| 121 | "Not such a table in pipeline model: %s", piTableId))); |
| 122 | |
| 123 | /* Translate selector */ |
| 124 | Collection<PiFieldMatch> fieldMatches = buildFieldMatches(interpreter, rule.selector(), table); |
| 125 | |
| 126 | /* Translate treatment */ |
Carmelo Cascone | f3a1a38 | 2017-07-27 12:04:39 -0400 | [diff] [blame] | 127 | PiAction piAction = buildAction(rule.treatment(), interpreter, piTableId); |
Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 128 | piAction = typeCheckAction(piAction, table); |
| 129 | |
| 130 | PiTableEntry.Builder tableEntryBuilder = PiTableEntry.builder(); |
| 131 | |
| 132 | // In BMv2 0 is the highest priority. |
Carmelo Cascone | 2cad9ef | 2017-08-01 21:52:07 +0200 | [diff] [blame] | 133 | // TODO: Move priority change to P4runtimeClient, in the table entry encode phase. |
| 134 | // Similarly, original priority should be re-established in the decode phase. |
| 135 | int newPriority = Integer.MAX_VALUE - rule.priority(); |
Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 136 | |
| 137 | tableEntryBuilder |
| 138 | .forTable(piTableId) |
Carmelo Cascone | 2cad9ef | 2017-08-01 21:52:07 +0200 | [diff] [blame] | 139 | .withPriority(newPriority) |
Carmelo Cascone | 0e896a0 | 2017-07-31 07:22:27 +0200 | [diff] [blame] | 140 | .withMatchKey(PiMatchKey.builder() |
| 141 | .addFieldMatches(fieldMatches) |
| 142 | .build()) |
Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 143 | .withAction(piAction); |
| 144 | |
| 145 | if (!rule.isPermanent()) { |
| 146 | if (table.supportsAging()) { |
| 147 | tableEntryBuilder.withTimeout((double) rule.timeout()); |
| 148 | } else { |
| 149 | log.warn("Flow rule is temporary, but table '{}' doesn't support " + |
| 150 | "aging, translating to permanent.", table.name()); |
| 151 | } |
| 152 | |
| 153 | } |
| 154 | |
| 155 | return tableEntryBuilder.build(); |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Builds a PI action out of the given treatment, optionally using the given interpreter. |
| 160 | */ |
| 161 | private static PiAction buildAction(TrafficTreatment treatment, PiPipelineInterpreter interpreter, |
Carmelo Cascone | f3a1a38 | 2017-07-27 12:04:39 -0400 | [diff] [blame] | 162 | PiTableId tableId) |
Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 163 | throws PiFlowRuleTranslationException { |
| 164 | |
| 165 | PiTableAction piTableAction = null; |
| 166 | |
| 167 | // If treatment has only one instruction of type PiInstruction, use that. |
| 168 | for (Instruction inst : treatment.allInstructions()) { |
| 169 | if (inst.type() == Instruction.Type.PROTOCOL_INDEPENDENT) { |
| 170 | if (treatment.allInstructions().size() == 1) { |
| 171 | piTableAction = ((PiInstruction) inst).action(); |
| 172 | } else { |
| 173 | throw new PiFlowRuleTranslationException(format( |
| 174 | "Unable to translate treatment, found multiple instructions " + |
| 175 | "of which one is protocol-independent: %s", treatment)); |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | if (piTableAction == null && interpreter != null) { |
| 181 | // No PiInstruction, use interpreter to build action. |
| 182 | try { |
Carmelo Cascone | f3a1a38 | 2017-07-27 12:04:39 -0400 | [diff] [blame] | 183 | piTableAction = interpreter.mapTreatment(treatment, tableId); |
Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 184 | } catch (PiPipelineInterpreter.PiInterpreterException e) { |
| 185 | throw new PiFlowRuleTranslationException( |
| 186 | "Interpreter was unable to translate treatment. " + e.getMessage()); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | if (piTableAction == null) { |
| 191 | // No PiInstruction, no interpreter. It's time to give up. |
| 192 | throw new PiFlowRuleTranslationException( |
| 193 | "Unable to translate treatment, neither an interpreter or a " |
| 194 | + "protocol-independent instruction were provided."); |
| 195 | } |
| 196 | |
| 197 | if (piTableAction.type() != PiTableAction.Type.ACTION) { |
| 198 | // TODO: implement handling of other table action types, e.g. action profiles. |
| 199 | throw new PiFlowRuleTranslationException(format( |
| 200 | "PiTableAction type %s is not supported yet.", piTableAction.type())); |
| 201 | } |
| 202 | |
| 203 | return (PiAction) piTableAction; |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * Checks that the given PI action is suitable for the given table model and returns a new action instance with |
| 208 | * parameters well-sized, according to the table model. If not suitable, throws an exception explaining why. |
| 209 | */ |
| 210 | private static PiAction typeCheckAction(PiAction piAction, PiTableModel table) |
| 211 | throws PiFlowRuleTranslationException { |
| 212 | |
| 213 | // Table supports this action? |
| 214 | PiActionModel actionModel = table.action(piAction.id().name()).orElseThrow( |
| 215 | () -> new PiFlowRuleTranslationException(format("Not such action '%s' for table '%s'", |
| 216 | piAction.id(), table.name()))); |
| 217 | |
| 218 | // Is the number of runtime parameters correct? |
| 219 | if (actionModel.params().size() != piAction.parameters().size()) { |
| 220 | throw new PiFlowRuleTranslationException(format( |
| 221 | "Wrong number of runtime parameters for action '%s', expected %d but found %d", |
| 222 | actionModel.name(), actionModel.params().size(), piAction.parameters().size())); |
| 223 | } |
| 224 | |
| 225 | // Forge a new action instance with well-sized parameters. |
| 226 | // The same comment as in typeCheckFieldMatch() about duplicating field match instances applies here. |
| 227 | PiAction.Builder newActionBuilder = PiAction.builder().withId(piAction.id()); |
| 228 | for (PiActionParam param : piAction.parameters()) { |
| 229 | PiActionParamModel paramModel = actionModel.param(param.id().name()) |
| 230 | .orElseThrow(() -> new PiFlowRuleTranslationException(format( |
| 231 | "Not such parameter '%s' for action '%s'", param.id(), actionModel.name()))); |
| 232 | try { |
| 233 | newActionBuilder.withParameter(new PiActionParam(param.id(), |
| 234 | fit(param.value(), paramModel.bitWidth()))); |
| 235 | } catch (ByteSequenceTrimException e) { |
| 236 | throw new PiFlowRuleTranslationException(format( |
| 237 | "Size mismatch for parameter '%s' of action '%s': %s", |
| 238 | param.id(), piAction.id(), e.getMessage())); |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | return newActionBuilder.build(); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Builds a collection of PI field matches out of the given selector, optionally using the given interpreter. The |
| 247 | * field matches returned are guaranteed to be compatible for the given table model. |
| 248 | */ |
| 249 | private static Collection<PiFieldMatch> buildFieldMatches(PiPipelineInterpreter interpreter, |
| 250 | TrafficSelector selector, PiTableModel tableModel) |
| 251 | throws PiFlowRuleTranslationException { |
| 252 | |
| 253 | Map<PiHeaderFieldId, PiFieldMatch> fieldMatches = Maps.newHashMap(); |
| 254 | |
| 255 | // If present, find a PiCriterion and get its field matches as a map. Otherwise, use an empty map. |
| 256 | Map<PiHeaderFieldId, PiFieldMatch> piCriterionFields = selector.criteria().stream() |
| 257 | .filter(c -> c.type().equals(PROTOCOL_INDEPENDENT)) |
| 258 | .map(c -> (PiCriterion) c) |
| 259 | .findFirst() |
| 260 | .map(PiCriterion::fieldMatches) |
| 261 | .map(c -> { |
| 262 | Map<PiHeaderFieldId, PiFieldMatch> fieldMap = Maps.newHashMap(); |
| 263 | c.forEach(fieldMatch -> fieldMap.put(fieldMatch.fieldId(), fieldMatch)); |
| 264 | return fieldMap; |
| 265 | }) |
| 266 | .orElse(Maps.newHashMap()); |
| 267 | |
| 268 | Set<Criterion> translatedCriteria = Sets.newHashSet(); |
| 269 | Set<Criterion> ignoredCriteria = Sets.newHashSet(); |
| 270 | Set<PiHeaderFieldId> usedPiCriterionFields = Sets.newHashSet(); |
| 271 | Set<PiHeaderFieldId> ignoredPiCriterionFields = Sets.newHashSet(); |
| 272 | |
| 273 | for (PiTableMatchFieldModel fieldModel : tableModel.matchFields()) { |
| 274 | |
Carmelo Cascone | 2cad9ef | 2017-08-01 21:52:07 +0200 | [diff] [blame] | 275 | PiHeaderFieldId fieldId = PiHeaderFieldId.of(fieldModel.field().header().name(), |
Carmelo Cascone | 00a5996 | 2017-06-16 17:51:49 +0900 | [diff] [blame] | 276 | fieldModel.field().type().name(), |
| 277 | fieldModel.field().header().index()); |
| 278 | |
| 279 | int bitWidth = fieldModel.field().type().bitWidth(); |
| 280 | int fieldByteWidth = (int) Math.ceil((double) bitWidth / 8); |
| 281 | |
| 282 | Optional<Criterion.Type> criterionType = |
| 283 | interpreter == null |
| 284 | ? Optional.empty() |
| 285 | : interpreter.mapPiHeaderFieldId(fieldId); |
| 286 | |
| 287 | Criterion criterion = criterionType.map(selector::getCriterion).orElse(null); |
| 288 | |
| 289 | if (!piCriterionFields.containsKey(fieldId) && criterion == null) { |
| 290 | // Neither a field in PiCriterion is available nor a Criterion mapping is possible. |
| 291 | // Can ignore if the match is ternary or LPM. |
| 292 | switch (fieldModel.matchType()) { |
| 293 | case TERNARY: |
| 294 | // Wildcard the whole field. |
| 295 | fieldMatches.put(fieldId, new PiTernaryFieldMatch( |
| 296 | fieldId, |
| 297 | ImmutableByteSequence.ofZeros(fieldByteWidth), |
| 298 | ImmutableByteSequence.ofZeros(fieldByteWidth))); |
| 299 | break; |
| 300 | case LPM: |
| 301 | // LPM with prefix 0 |
| 302 | fieldMatches.put(fieldId, new PiLpmFieldMatch(fieldId, |
| 303 | ImmutableByteSequence.ofZeros(fieldByteWidth), |
| 304 | 0)); |
| 305 | break; |
| 306 | // FIXME: Can we handle the case of RANGE or VALID match? |
| 307 | default: |
| 308 | throw new PiFlowRuleTranslationException(format( |
| 309 | "No value found for required match field '%s'", fieldId)); |
| 310 | } |
| 311 | // Next field. |
| 312 | continue; |
| 313 | } |
| 314 | |
| 315 | PiFieldMatch fieldMatch = null; |
| 316 | |
| 317 | if (criterion != null) { |
| 318 | // Criterion mapping is possible for this field id. |
| 319 | try { |
| 320 | fieldMatch = translateCriterion(criterion, fieldId, fieldModel.matchType(), bitWidth); |
| 321 | translatedCriteria.add(criterion); |
| 322 | } catch (PiFlowRuleTranslationException ex) { |
| 323 | // Ignore exception if the same field was found in PiCriterion. |
| 324 | if (piCriterionFields.containsKey(fieldId)) { |
| 325 | ignoredCriteria.add(criterion); |
| 326 | } else { |
| 327 | throw ex; |
| 328 | } |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | if (piCriterionFields.containsKey(fieldId)) { |
| 333 | // Field was found in PiCriterion. |
| 334 | if (fieldMatch != null) { |
| 335 | // Field was already translated from other criterion. |
| 336 | // Throw exception only if we are trying to match on different values of the same field... |
| 337 | if (!fieldMatch.equals(piCriterionFields.get(fieldId))) { |
| 338 | throw new PiFlowRuleTranslationException(format( |
| 339 | "Duplicate match field '%s': instance translated from criterion '%s' is different to " + |
| 340 | "what found in PiCriterion.", fieldId, criterion.type())); |
| 341 | } |
| 342 | ignoredPiCriterionFields.add(fieldId); |
| 343 | } else { |
| 344 | fieldMatch = piCriterionFields.get(fieldId); |
| 345 | fieldMatch = typeCheckFieldMatch(fieldMatch, fieldModel); |
| 346 | usedPiCriterionFields.add(fieldId); |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | fieldMatches.put(fieldId, fieldMatch); |
| 351 | } |
| 352 | |
| 353 | // Check if all criteria have been translated. |
| 354 | StringJoiner skippedCriteriaJoiner = new StringJoiner(", "); |
| 355 | selector.criteria().stream() |
| 356 | .filter(c -> !c.type().equals(PROTOCOL_INDEPENDENT)) |
| 357 | .filter(c -> !translatedCriteria.contains(c) && !ignoredCriteria.contains(c)) |
| 358 | .forEach(c -> skippedCriteriaJoiner.add(c.type().name())); |
| 359 | if (skippedCriteriaJoiner.length() > 0) { |
| 360 | throw new PiFlowRuleTranslationException(format( |
| 361 | "The following criteria cannot be translated for table '%s': %s", |
| 362 | tableModel.name(), skippedCriteriaJoiner.toString())); |
| 363 | } |
| 364 | |
| 365 | // Check if all fields found in PiCriterion have been used. |
| 366 | StringJoiner skippedPiFieldsJoiner = new StringJoiner(", "); |
| 367 | piCriterionFields.keySet().stream() |
| 368 | .filter(k -> !usedPiCriterionFields.contains(k) && !ignoredPiCriterionFields.contains(k)) |
| 369 | .forEach(k -> skippedPiFieldsJoiner.add(k.id())); |
| 370 | if (skippedPiFieldsJoiner.length() > 0) { |
| 371 | throw new PiFlowRuleTranslationException(format( |
| 372 | "The following PiCriterion field matches are not supported in table '%s': %s", |
| 373 | tableModel.name(), skippedPiFieldsJoiner.toString())); |
| 374 | } |
| 375 | |
| 376 | return fieldMatches.values(); |
| 377 | } |
| 378 | |
| 379 | private static PiFieldMatch typeCheckFieldMatch(PiFieldMatch fieldMatch, PiTableMatchFieldModel fieldModel) |
| 380 | throws PiFlowRuleTranslationException { |
| 381 | |
| 382 | // Check parameter type and size |
| 383 | if (!fieldModel.matchType().equals(fieldMatch.type())) { |
| 384 | throw new PiFlowRuleTranslationException(format( |
| 385 | "Wrong match type for field '%s', expected %s, but found %s", |
| 386 | fieldMatch.fieldId(), fieldModel.matchType().name(), fieldMatch.type().name())); |
| 387 | } |
| 388 | |
| 389 | int modelBitWidth = fieldModel.field().type().bitWidth(); |
| 390 | |
| 391 | /* |
| 392 | Here we try to be robust against wrong size fields with the goal of having PiCriterion independent of the |
| 393 | pipeline model. We duplicate the field match, fitting the byte sequences to the bit-width specified in the |
| 394 | model. This operation is expensive when performed for each field match of each flow rule, but should be |
| 395 | mitigated by the translation cache provided by PiFlowRuleTranslationServiceImpl. |
| 396 | */ |
| 397 | |
| 398 | try { |
| 399 | switch (fieldModel.matchType()) { |
| 400 | case EXACT: |
| 401 | return new PiExactFieldMatch(fieldMatch.fieldId(), |
| 402 | fit(((PiExactFieldMatch) fieldMatch).value(), modelBitWidth)); |
| 403 | case TERNARY: |
| 404 | return new PiTernaryFieldMatch(fieldMatch.fieldId(), |
| 405 | fit(((PiTernaryFieldMatch) fieldMatch).value(), modelBitWidth), |
| 406 | fit(((PiTernaryFieldMatch) fieldMatch).mask(), modelBitWidth)); |
| 407 | case LPM: |
| 408 | PiLpmFieldMatch lpmfield = (PiLpmFieldMatch) fieldMatch; |
| 409 | if (lpmfield.prefixLength() > modelBitWidth) { |
| 410 | throw new PiFlowRuleTranslationException(format( |
| 411 | "Invalid prefix length for LPM field '%s', found %d but field has bit-width %d", |
| 412 | fieldMatch.fieldId(), lpmfield.prefixLength(), modelBitWidth)); |
| 413 | } |
| 414 | return new PiLpmFieldMatch(fieldMatch.fieldId(), |
| 415 | fit(lpmfield.value(), modelBitWidth), |
| 416 | lpmfield.prefixLength()); |
| 417 | case RANGE: |
| 418 | return new PiRangeFieldMatch(fieldMatch.fieldId(), |
| 419 | fit(((PiRangeFieldMatch) fieldMatch).lowValue(), modelBitWidth), |
| 420 | fit(((PiRangeFieldMatch) fieldMatch).highValue(), modelBitWidth)); |
| 421 | case VALID: |
| 422 | return fieldMatch; |
| 423 | default: |
| 424 | // Should never be here. |
| 425 | throw new RuntimeException( |
| 426 | "Unrecognized match type " + fieldModel.matchType().name()); |
| 427 | } |
| 428 | } catch (ByteSequenceTrimException e) { |
| 429 | throw new PiFlowRuleTranslationException(format( |
| 430 | "Size mismatch for field %s: %s", fieldMatch.fieldId(), e.getMessage())); |
| 431 | } |
| 432 | } |
| 433 | } |