| /* |
| * Copyright 2016-present Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.onosproject.bmv2.ctl; |
| |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.CacheStats; |
| import com.google.common.cache.LoadingCache; |
| import com.google.common.collect.Lists; |
| import org.apache.commons.lang3.tuple.Pair; |
| import org.onlab.util.HexString; |
| import org.onlab.util.ImmutableByteSequence; |
| import org.onlab.util.SharedScheduledExecutors; |
| import org.onosproject.bmv2.api.context.Bmv2ActionModel; |
| import org.onosproject.bmv2.api.context.Bmv2Configuration; |
| import org.onosproject.bmv2.api.runtime.Bmv2Action; |
| import org.onosproject.bmv2.api.runtime.Bmv2ExactMatchParam; |
| import org.onosproject.bmv2.api.runtime.Bmv2LpmMatchParam; |
| import org.onosproject.bmv2.api.runtime.Bmv2MatchKey; |
| import org.onosproject.bmv2.api.runtime.Bmv2ParsedTableEntry; |
| import org.onosproject.bmv2.api.runtime.Bmv2TernaryMatchParam; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| import java.util.stream.Collectors; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.onosproject.bmv2.api.utils.Bmv2TranslatorUtils.fitByteSequence; |
| import static org.onosproject.bmv2.api.utils.Bmv2TranslatorUtils.ByteSequenceFitException; |
| |
| /** |
| * BMv2 table dump parser. |
| */ |
| public final class Bmv2TableDumpParser { |
| |
| // Examples of a BMv2 table dump can be found in Bmv2TableDumpParserTest |
| |
| // 1: entry id, 2: match string, 3: action string |
| private static final String ENTRY_PATTERN_REGEX = "(\\d+): (.*) => (.*)"; |
| // 1: match values, 2: masks |
| private static final String MATCH_TERNARY_PATTERN_REGEX = "([0-9a-fA-F ]+) &&& ([0-9a-fA-F ]+)"; |
| // 1: match values, 2: masks |
| private static final String MATCH_LPM_PATTERN_REGEX = "([0-9a-fA-F ]+) / ([0-9a-fA-F ]+)"; |
| // 1: match values |
| private static final String MATCH_EXACT_PATTERN_REGEX = "([0-9a-fA-F ]+)"; |
| // 1: action name, 2: action params |
| private static final String ACTION_PATTERN_REGEX = "(.+) - ?([0-9a-fA-F ,]*)"; |
| |
| private static final Pattern ENTRY_PATTERN = Pattern.compile(ENTRY_PATTERN_REGEX); |
| private static final Pattern MATCH_TERNARY_PATTERN = Pattern.compile(MATCH_TERNARY_PATTERN_REGEX); |
| private static final Pattern MATCH_LPM_PATTERN = Pattern.compile(MATCH_LPM_PATTERN_REGEX); |
| private static final Pattern MATCH_EXACT_PATTERN = Pattern.compile(MATCH_EXACT_PATTERN_REGEX); |
| private static final Pattern ACTION_PATTERN = Pattern.compile(ACTION_PATTERN_REGEX); |
| |
| // Cache to avoid re-parsing known lines. |
| // The assumption here is that entries are not updated too frequently, so that the entry id doesn't change often. |
| // Otherwise, we should cache only the match and action strings... |
| private static final LoadingCache<Pair<String, Bmv2Configuration>, Optional<Bmv2ParsedTableEntry>> ENTRY_CACHE = |
| CacheBuilder.newBuilder() |
| .expireAfterAccess(60, TimeUnit.SECONDS) |
| .recordStats() |
| .build(new CacheLoader<Pair<String, Bmv2Configuration>, Optional<Bmv2ParsedTableEntry>>() { |
| @Override |
| public Optional<Bmv2ParsedTableEntry> load(Pair<String, Bmv2Configuration> key) throws Exception { |
| // Very expensive call. |
| return Optional.ofNullable(parseLine(key.getLeft(), key.getRight())); |
| } |
| }); |
| |
| private static final Logger log = LoggerFactory.getLogger(Bmv2TableDumpParser.class); |
| |
| private static final long STATS_LOG_FREQUENCY = 3; // minutes |
| |
| static { |
| SharedScheduledExecutors.getSingleThreadExecutor().scheduleAtFixedRate( |
| () -> reportStats(), 0, STATS_LOG_FREQUENCY, TimeUnit.MINUTES); |
| } |
| |
| private Bmv2TableDumpParser() { |
| // Ban constructor. |
| } |
| |
| /** |
| * Parse the given BMv2 table dump. |
| * |
| * @param tableDump a string value |
| * @return a list of {@link Bmv2ParsedTableEntry} |
| */ |
| public static List<Bmv2ParsedTableEntry> parse(String tableDump, Bmv2Configuration configuration) { |
| checkNotNull(tableDump, "tableDump cannot be null"); |
| // Parse all lines |
| List<Bmv2ParsedTableEntry> result = Arrays.stream(tableDump.split("\n")) |
| .map(line -> Pair.of(line, configuration)) |
| .map(Bmv2TableDumpParser::loadFromCache) |
| .filter(Optional::isPresent) |
| .map(Optional::get) |
| .collect(Collectors.toList()); |
| return result; |
| } |
| |
| private static Optional<Bmv2ParsedTableEntry> loadFromCache(Pair<String, Bmv2Configuration> key) { |
| try { |
| return ENTRY_CACHE.get(key); |
| } catch (ExecutionException e) { |
| Throwable t = e.getCause(); |
| if (t instanceof Bmv2TableDumpParserException) { |
| Bmv2TableDumpParserException parserException = (Bmv2TableDumpParserException) t; |
| log.warn("{}", parserException.getMessage()); |
| } else { |
| log.error("Exception while parsing table dump line", e); |
| } |
| return Optional.empty(); |
| } |
| } |
| |
| private static void reportStats() { |
| CacheStats stats = ENTRY_CACHE.stats(); |
| log.info("Cache stats: requestCount={}, hitRate={}, exceptionsCount={}, avgLoadPenalty={}", |
| stats.requestCount(), stats.hitRate(), stats.loadExceptionCount(), stats.averageLoadPenalty()); |
| } |
| |
| private static Bmv2ParsedTableEntry parseLine(String line, Bmv2Configuration configuration) |
| throws Bmv2TableDumpParserException { |
| Matcher matcher = ENTRY_PATTERN.matcher(line); |
| if (matcher.find()) { |
| long entryId = parseEntryId(matcher, 1); |
| String matchString = parseMatchString(matcher, 2); |
| String actionString = parseActionString(matcher, 3); |
| Bmv2MatchKey matchKey = parseMatchKey(matchString); |
| Bmv2Action action = parseAction(actionString, configuration); |
| return new Bmv2ParsedTableEntry(entryId, matchKey, action); |
| } else { |
| // Not a table entry |
| return null; |
| } |
| } |
| |
| private static Long parseEntryId(Matcher matcher, int groupIdx) throws Bmv2TableDumpParserException { |
| String str = matcher.group(groupIdx); |
| if (str == null) { |
| throw new Bmv2TableDumpParserException("Unable to find entry ID: " + matcher.group()); |
| } |
| long entryId; |
| try { |
| entryId = Long.valueOf(str.trim()); |
| } catch (NumberFormatException e) { |
| throw new Bmv2TableDumpParserException("Unable to parse entry id for string: " + matcher.group()); |
| } |
| return entryId; |
| } |
| |
| private static String parseMatchString(Matcher matcher, int groupIdx) throws Bmv2TableDumpParserException { |
| String str = matcher.group(groupIdx); |
| if (str == null) { |
| throw new Bmv2TableDumpParserException("Unable to find match string: " + matcher.group()); |
| } |
| return str.trim(); |
| } |
| |
| private static String parseActionString(Matcher matcher, int groupIdx) throws Bmv2TableDumpParserException { |
| String str = matcher.group(groupIdx); |
| if (str == null) { |
| throw new Bmv2TableDumpParserException("Unable to find action string: " + matcher.group()); |
| } |
| return str.trim(); |
| } |
| |
| private static Bmv2MatchKey parseMatchKey(String str) throws Bmv2TableDumpParserException { |
| |
| Bmv2MatchKey.Builder builder = Bmv2MatchKey.builder(); |
| |
| // Try with ternary... |
| Matcher matcher = MATCH_TERNARY_PATTERN.matcher(str); |
| if (matcher.find()) { |
| // Ternary Match. |
| List<ImmutableByteSequence> values = parseMatchValues(matcher, 1); |
| List<ImmutableByteSequence> masks = parseMatchMasks(matcher, 2, values); |
| for (int i = 0; i < values.size(); i++) { |
| builder.add(new Bmv2TernaryMatchParam(values.get(i), masks.get(i))); |
| } |
| return builder.build(); |
| } |
| |
| // FIXME: LPM match parsing broken if table key contains also a ternary match |
| // Also it assumes the lpm parameter is the last one, which is wrong. |
| // Try with LPM... |
| matcher = MATCH_LPM_PATTERN.matcher(str); |
| if (matcher.find()) { |
| // Lpm Match. |
| List<ImmutableByteSequence> values = parseMatchValues(matcher, 1); |
| int prefixLength = parseLpmPrefix(matcher, 2); |
| for (int i = 0; i < values.size() - 1; i++) { |
| builder.add(new Bmv2ExactMatchParam(values.get(i))); |
| } |
| builder.add(new Bmv2LpmMatchParam(values.get(values.size() - 1), prefixLength)); |
| return builder.build(); |
| } |
| |
| // Try with exact... |
| matcher = MATCH_EXACT_PATTERN.matcher(str); |
| if (matcher.find()) { |
| // Exact match. |
| parseMatchValues(matcher, 1) |
| .stream() |
| .map(Bmv2ExactMatchParam::new) |
| .forEach(builder::add); |
| return builder.build(); |
| } |
| |
| throw new Bmv2TableDumpParserException("Unable to parse match string: " + str); |
| } |
| |
| private static List<ImmutableByteSequence> parseMatchValues(Matcher matcher, int groupIdx) |
| throws Bmv2TableDumpParserException { |
| String matchString = matcher.group(groupIdx); |
| if (matchString == null) { |
| throw new Bmv2TableDumpParserException("Unable to find match params for string: " + matcher.group()); |
| } |
| List<ImmutableByteSequence> result = Lists.newArrayList(); |
| for (String paramString : matchString.split(" ")) { |
| byte[] bytes = HexString.fromHexString(paramString, null); |
| result.add(ImmutableByteSequence.copyFrom(bytes)); |
| } |
| return result; |
| } |
| |
| private static List<ImmutableByteSequence> parseMatchMasks(Matcher matcher, int groupIdx, |
| List<ImmutableByteSequence> matchParams) |
| throws Bmv2TableDumpParserException { |
| String maskString = matcher.group(groupIdx); |
| if (maskString == null) { |
| throw new Bmv2TableDumpParserException("Unable to find mask for string: " + matcher.group()); |
| } |
| List<ImmutableByteSequence> result = Lists.newArrayList(); |
| /* |
| Mask here is a hex string with no spaces, hence individual mask params can be derived according |
| to given matchParam sizes. |
| */ |
| byte[] maskBytes = HexString.fromHexString(maskString, null); |
| int startPosition = 0; |
| for (ImmutableByteSequence bs : matchParams) { |
| if (startPosition + bs.size() > maskBytes.length) { |
| throw new Bmv2TableDumpParserException("Invalid length for mask in string: " + matcher.group()); |
| } |
| ImmutableByteSequence maskParam = ImmutableByteSequence.copyFrom(maskBytes, |
| startPosition, |
| startPosition + bs.size() - 1); |
| result.add(maskParam); |
| startPosition += bs.size(); |
| } |
| return result; |
| } |
| |
| private static int parseLpmPrefix(Matcher matcher, int groupIdx) |
| throws Bmv2TableDumpParserException { |
| String str = matcher.group(groupIdx); |
| if (str == null) { |
| throw new Bmv2TableDumpParserException("Unable to find LPM prefix for string: " + matcher.group()); |
| } |
| // For some reason the dumped prefix has 16 bits more than the one programmed |
| try { |
| return Integer.valueOf(str.trim()) - 16; |
| } catch (NumberFormatException e) { |
| throw new Bmv2TableDumpParserException("Unable to parse LPM prefix from string: " + matcher.group()); |
| } |
| } |
| |
| private static Bmv2Action parseAction(String str, Bmv2Configuration configuration) |
| throws Bmv2TableDumpParserException { |
| Matcher matcher = ACTION_PATTERN.matcher(str); |
| if (matcher.find()) { |
| String actionName = parseActionName(matcher, 1); |
| Bmv2ActionModel actionModel = configuration.action(actionName); |
| if (actionModel == null) { |
| throw new Bmv2TableDumpParserException("Not such an action in configuration: " + actionName); |
| } |
| Bmv2Action.Builder builder = Bmv2Action.builder().withName(actionName); |
| List<ImmutableByteSequence> actionParams = parseActionParams(matcher, 2); |
| if (actionParams.size() != actionModel.runtimeDatas().size()) { |
| throw new Bmv2TableDumpParserException("Invalid number of parameters for action: " + actionName); |
| } |
| for (int i = 0; i < actionModel.runtimeDatas().size(); i++) { |
| try { |
| // fit param byte-width according to configuration. |
| builder.addParameter(fitByteSequence(actionParams.get(i), |
| actionModel.runtimeDatas().get(i).bitWidth())); |
| } catch (ByteSequenceFitException e) { |
| throw new Bmv2TableDumpParserException("Unable to parse action param: " + e.toString()); |
| } |
| } |
| return builder.build(); |
| } |
| throw new Bmv2TableDumpParserException("Unable to parse action string: " + str.trim()); |
| } |
| |
| private static String parseActionName(Matcher matcher, int groupIdx) throws Bmv2TableDumpParserException { |
| String actionName = matcher.group(groupIdx); |
| if (actionName == null) { |
| throw new Bmv2TableDumpParserException("Unable to find action name for string: " + matcher.group()); |
| } |
| return actionName.trim(); |
| } |
| |
| private static List<ImmutableByteSequence> parseActionParams(Matcher matcher, int groupIdx) |
| throws Bmv2TableDumpParserException { |
| String paramsString = matcher.group(groupIdx); |
| if (paramsString == null) { |
| throw new Bmv2TableDumpParserException("Unable to find action params for string: " + matcher.group()); |
| } |
| if (paramsString.length() == 0) { |
| return Collections.emptyList(); |
| } |
| return Arrays.stream(paramsString.split(",")) |
| .map(String::trim) |
| .map(s -> HexString.fromHexString(s, null)) |
| .map(ImmutableByteSequence::copyFrom) |
| .collect(Collectors.toList()); |
| } |
| |
| public static class Bmv2TableDumpParserException extends Exception { |
| public Bmv2TableDumpParserException(String msg) { |
| super(msg); |
| } |
| } |
| } |