Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018-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.segmentrouting; |
| 18 | |
| 19 | import java.util.Map; |
| 20 | import java.util.Map.Entry; |
| 21 | import java.util.Set; |
| 22 | import java.util.concurrent.ConcurrentHashMap; |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 23 | import java.util.stream.Collectors; |
| 24 | |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 25 | import org.onosproject.net.Device; |
| 26 | import org.onosproject.net.DeviceId; |
| 27 | import org.onosproject.net.HostLocation; |
| 28 | import org.onosproject.net.Link; |
| 29 | import org.onosproject.net.PortNumber; |
| 30 | import org.onosproject.net.link.LinkService; |
| 31 | import org.onosproject.segmentrouting.config.DeviceConfigNotFoundException; |
| 32 | import org.onosproject.segmentrouting.config.DeviceConfiguration; |
| 33 | import org.onosproject.segmentrouting.grouphandler.DefaultGroupHandler; |
| 34 | import org.onosproject.store.service.EventuallyConsistentMap; |
| 35 | import org.onosproject.store.service.EventuallyConsistentMapBuilder; |
| 36 | import org.onosproject.store.service.WallClockTimestamp; |
| 37 | import org.slf4j.Logger; |
| 38 | import org.slf4j.LoggerFactory; |
| 39 | |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 40 | import com.google.common.collect.ImmutableMap; |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 41 | import com.google.common.collect.Sets; |
| 42 | |
| 43 | public class LinkHandler { |
| 44 | private static final Logger log = LoggerFactory.getLogger(LinkHandler.class); |
| 45 | protected final SegmentRoutingManager srManager; |
| 46 | protected LinkService linkService; |
| 47 | |
| 48 | // Local store for all links seen and their present status, used for |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 49 | // optimized routing. The existence of the link in the keys is enough to know |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 50 | // if the link has been "seen-before" by this instance of the controller. |
| 51 | // The boolean value indicates if the link is currently up or not. |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 52 | // Currently the optimized routing logic depends on "forgetting" a link |
| 53 | // when a switch goes down, but "remembering" it when only the link goes down. |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 54 | private Map<Link, Boolean> seenLinks = new ConcurrentHashMap<>(); |
| 55 | |
| 56 | private EventuallyConsistentMap<DeviceId, Set<PortNumber>> downedPortStore = null; |
| 57 | |
| 58 | /** |
| 59 | * Constructs the LinkHandler. |
| 60 | * |
| 61 | * @param srManager Segment Routing manager |
| 62 | */ |
| 63 | LinkHandler(SegmentRoutingManager srManager) { |
| 64 | this.srManager = srManager; |
| 65 | linkService = srManager.linkService; |
| 66 | log.debug("Creating EC map downedportstore"); |
| 67 | EventuallyConsistentMapBuilder<DeviceId, Set<PortNumber>> downedPortsMapBuilder |
| 68 | = srManager.storageService.eventuallyConsistentMapBuilder(); |
| 69 | downedPortStore = downedPortsMapBuilder.withName("downedportstore") |
| 70 | .withSerializer(srManager.createSerializer()) |
| 71 | .withTimestampProvider((k, v) -> new WallClockTimestamp()) |
| 72 | .build(); |
| 73 | log.trace("Current size {}", downedPortStore.size()); |
Saurav Das | e321cff | 2018-02-09 17:26:45 -0800 | [diff] [blame] | 74 | init(); |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Constructs the LinkHandler for unit-testing. |
| 79 | * |
| 80 | * @param srManager SegmentRoutingManager |
| 81 | * @param linkService LinkService |
| 82 | */ |
| 83 | LinkHandler(SegmentRoutingManager srManager, LinkService linkService) { |
| 84 | this.srManager = srManager; |
| 85 | this.linkService = linkService; |
| 86 | } |
| 87 | |
| 88 | /** |
Saurav Das | e321cff | 2018-02-09 17:26:45 -0800 | [diff] [blame] | 89 | * Initialize LinkHandler. |
| 90 | */ |
| 91 | private void init() { |
| 92 | log.info("Loading stored links"); |
| 93 | srManager.linkService.getActiveLinks() |
| 94 | .forEach(link -> processLinkAdded(link)); |
| 95 | } |
| 96 | |
| 97 | /** |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 98 | * Preprocessing of added link before being sent for route-path handling. |
| 99 | * Also performs post processing of link. |
| 100 | * |
| 101 | * @param link the link to be processed |
| 102 | */ |
| 103 | void processLinkAdded(Link link) { |
| 104 | log.info("** LINK ADDED {}", link.toString()); |
| 105 | if (!isLinkValid(link)) { |
| 106 | return; |
| 107 | } |
Saurav Das | e321cff | 2018-02-09 17:26:45 -0800 | [diff] [blame] | 108 | if (srManager.deviceConfiguration == null || |
| 109 | !srManager.deviceConfiguration.isConfigured(link.src().deviceId())) { |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 110 | updateSeenLink(link, true); |
| 111 | // XXX revisit - what about devicePortMap |
| 112 | log.warn("Source device of this link is not configured.. " |
| 113 | + "not processing further"); |
| 114 | return; |
| 115 | } |
| 116 | |
| 117 | // Irrespective of whether the local is a MASTER or not for this device, |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 118 | // create group handler instance and push default TTP flow rules if needed, |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 119 | // as in a multi-instance setup, instances can initiate groups for any |
| 120 | // device. |
| 121 | DefaultGroupHandler groupHandler = srManager.groupHandlerMap |
| 122 | .get(link.src().deviceId()); |
| 123 | if (groupHandler != null) { |
| 124 | groupHandler.portUpForLink(link); |
| 125 | } else { |
| 126 | // XXX revisit/cleanup |
| 127 | Device device = srManager.deviceService.getDevice(link.src().deviceId()); |
| 128 | if (device != null) { |
| 129 | log.warn("processLinkAdded: Link Added " |
| 130 | + "Notification without Device Added " |
| 131 | + "event, still handling it"); |
| 132 | srManager.processDeviceAdded(device); |
| 133 | groupHandler = srManager.groupHandlerMap.get(link.src().deviceId()); |
| 134 | groupHandler.portUpForLink(link); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | // process link only if it is bidirectional |
| 140 | if (!isBidirectional(link)) { |
| 141 | log.debug("Link not bidirectional.. waiting for other direction " + |
| 142 | "src {} --> dst {} ", link.dst(), link.src()); |
| 143 | // note that if we are not processing for routing, it should at least |
| 144 | // be considered a seen-link |
| 145 | updateSeenLink(link, true); return; |
| 146 | } |
| 147 | //TODO ensure that rehash is still done correctly even if link is not processed for |
| 148 | //rerouting - perhaps rehash in both directions when it ultimately becomes bidi? |
| 149 | */ |
| 150 | |
| 151 | log.debug("Starting optimized route-path processing for added link " |
| 152 | + "{} --> {}", link.src(), link.dst()); |
| 153 | boolean seenBefore = isSeenLink(link); |
| 154 | // seenLink updates will be done after route-path changes |
| 155 | srManager.defaultRoutingHandler |
| 156 | .populateRoutingRulesForLinkStatusChange(null, link, null); |
| 157 | |
| 158 | if (srManager.mastershipService.isLocalMaster(link.src().deviceId())) { |
| 159 | // handle edge-ports for dual-homed hosts |
| 160 | updateDualHomedHostPorts(link, true); |
| 161 | |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 162 | // It's possible that linkUp causes no route-path change as ECMP graph does |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 163 | // not change if the link is a parallel link (same src-dst as |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 164 | // another link). However we still need to update ECMP hash groups to include new buckets |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 165 | // for the link that has come up. |
Ray Milkey | 43969b9 | 2018-01-24 10:41:14 -0800 | [diff] [blame] | 166 | if (groupHandler != null) { |
| 167 | if (!seenBefore && isParallelLink(link)) { |
| 168 | // if link seen first time, we need to ensure hash-groups have |
| 169 | // all ports |
| 170 | log.debug("Attempting retryHash for paralled first-time link {}", |
| 171 | link); |
| 172 | groupHandler.retryHash(link, false, true); |
| 173 | } else { |
| 174 | // seen before-link |
| 175 | if (isParallelLink(link)) { |
| 176 | log.debug("Attempting retryHash for paralled seen-before " |
| 177 | + "link {}", link); |
| 178 | groupHandler.retryHash(link, false, false); |
| 179 | } |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 180 | } |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | srManager.mcastHandler.init(); |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Preprocessing of removed link before being sent for route-path handling. |
| 189 | * Also performs post processing of link. |
| 190 | * |
| 191 | * @param link the link to be processed |
| 192 | */ |
| 193 | void processLinkRemoved(Link link) { |
| 194 | log.info("** LINK REMOVED {}", link.toString()); |
| 195 | if (!isLinkValid(link)) { |
| 196 | return; |
| 197 | } |
| 198 | // when removing links, update seen links first, before doing route-path |
| 199 | // changes |
| 200 | updateSeenLink(link, false); |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 201 | // handle edge-ports for dual-homed hosts |
| 202 | if (srManager.mastershipService.isLocalMaster(link.src().deviceId())) { |
| 203 | updateDualHomedHostPorts(link, false); |
| 204 | } |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 205 | |
| 206 | // device availability check helps to ensure that multiple link-removed |
| 207 | // events are actually treated as a single switch removed event. |
| 208 | // purgeSeenLink is necessary so we do rerouting (instead of rehashing) |
| 209 | // when switch comes back. |
| 210 | if (link.src().elementId() instanceof DeviceId |
| 211 | && !srManager.deviceService.isAvailable(link.src().deviceId())) { |
| 212 | purgeSeenLink(link); |
| 213 | return; |
| 214 | } |
| 215 | if (link.dst().elementId() instanceof DeviceId |
| 216 | && !srManager.deviceService.isAvailable(link.dst().deviceId())) { |
| 217 | purgeSeenLink(link); |
| 218 | return; |
| 219 | } |
| 220 | |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 221 | log.debug("Starting optimized route-path processing for removed link " |
| 222 | + "{} --> {}", link.src(), link.dst()); |
| 223 | srManager.defaultRoutingHandler |
| 224 | .populateRoutingRulesForLinkStatusChange(link, null, null); |
| 225 | |
| 226 | // update local groupHandler stores |
| 227 | DefaultGroupHandler groupHandler = srManager.groupHandlerMap |
| 228 | .get(link.src().deviceId()); |
| 229 | if (groupHandler != null) { |
| 230 | if (srManager.mastershipService.isLocalMaster(link.src().deviceId()) |
| 231 | && isParallelLink(link)) { |
| 232 | log.debug("* retrying hash for parallel link removed:{}", link); |
| 233 | groupHandler.retryHash(link, true, false); |
| 234 | } else { |
| 235 | log.debug("Not attempting retry-hash for link removed: {} .. {}", |
| 236 | link, |
| 237 | (srManager.mastershipService.isLocalMaster(link.src() |
| 238 | .deviceId())) ? "not parallel" |
| 239 | : "not master"); |
| 240 | } |
| 241 | // ensure local stores are updated |
| 242 | groupHandler.portDown(link.src().port()); |
| 243 | } else { |
| 244 | log.warn("group handler not found for dev:{} when removing link: {}", |
| 245 | link.src().deviceId(), link); |
| 246 | } |
| 247 | |
| 248 | srManager.mcastHandler.processLinkDown(link); |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Checks validity of link. Examples of invalid links include |
| 253 | * indirect-links, links between ports on the same switch, and more. |
| 254 | * |
| 255 | * @param link the link to be processed |
| 256 | * @return true if valid link |
| 257 | */ |
| 258 | private boolean isLinkValid(Link link) { |
| 259 | if (link.type() != Link.Type.DIRECT) { |
| 260 | // NOTE: A DIRECT link might be transiently marked as INDIRECT |
| 261 | // if BDDP is received before LLDP. We can safely ignore that |
| 262 | // until the LLDP is received and the link is marked as DIRECT. |
| 263 | log.info("Ignore link {}->{}. Link type is {} instead of DIRECT.", |
| 264 | link.src(), link.dst(), link.type()); |
| 265 | return false; |
| 266 | } |
| 267 | DeviceId srcId = link.src().deviceId(); |
| 268 | DeviceId dstId = link.dst().deviceId(); |
| 269 | if (srcId.equals(dstId)) { |
| 270 | log.warn("Links between ports on the same switch are not " |
| 271 | + "allowed .. ignoring link {}", link); |
| 272 | return false; |
| 273 | } |
| 274 | DeviceConfiguration devConfig = srManager.deviceConfiguration; |
Saurav Das | e321cff | 2018-02-09 17:26:45 -0800 | [diff] [blame] | 275 | if (devConfig == null) { |
| 276 | log.warn("Cannot check validity of link without device config"); |
| 277 | return true; |
| 278 | } |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 279 | try { |
| 280 | if (!devConfig.isEdgeDevice(srcId) |
| 281 | && !devConfig.isEdgeDevice(dstId)) { |
| 282 | // ignore links between spines |
| 283 | // XXX revisit when handling multi-stage fabrics |
| 284 | log.warn("Links between spines not allowed...ignoring " |
| 285 | + "link {}", link); |
| 286 | return false; |
| 287 | } |
| 288 | if (devConfig.isEdgeDevice(srcId) |
| 289 | && devConfig.isEdgeDevice(dstId)) { |
| 290 | // ignore links between leaves if they are not pair-links |
| 291 | // XXX revisit if removing pair-link config or allowing more than |
| 292 | // one pair-link |
| 293 | if (devConfig.getPairDeviceId(srcId).equals(dstId) |
| 294 | && devConfig.getPairLocalPort(srcId) |
| 295 | .equals(link.src().port()) |
| 296 | && devConfig.getPairLocalPort(dstId) |
| 297 | .equals(link.dst().port())) { |
| 298 | // found pair link - allow it |
| 299 | return true; |
| 300 | } else { |
| 301 | log.warn("Links between leaves other than pair-links are " |
| 302 | + "not allowed...ignoring link {}", link); |
| 303 | return false; |
| 304 | } |
| 305 | } |
| 306 | } catch (DeviceConfigNotFoundException e) { |
| 307 | // We still want to count the links in seenLinks even though there |
| 308 | // is no config. So we let it return true |
| 309 | log.warn("Could not check validity of link {} as subtending devices " |
| 310 | + "are not yet configured", link); |
| 311 | } |
| 312 | return true; |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Administratively enables or disables edge ports if the link that was |
| 317 | * added or removed was the only uplink port from an edge device. Only edge |
| 318 | * ports that belong to dual-homed hosts are considered. |
| 319 | * |
| 320 | * @param link the link to be processed |
| 321 | * @param added true if link was added, false if link was removed |
| 322 | */ |
| 323 | private void updateDualHomedHostPorts(Link link, boolean added) { |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 324 | if (!onlyUplink(link)) { |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 325 | return; |
| 326 | } |
| 327 | if (added) { |
| 328 | // re-enable previously disabled ports on this dev |
| 329 | Set<PortNumber> p = downedPortStore.remove(link.src().deviceId()); |
| 330 | if (p != null) { |
| 331 | log.warn("Link src {} -->dst {} added is the first uplink, " |
| 332 | + "enabling dual homed ports: {}", link.src().deviceId(), |
| 333 | link.dst().deviceId(), (p.isEmpty()) ? "no ports" : p); |
| 334 | p.forEach(pnum -> srManager.deviceAdminService |
| 335 | .changePortState(link.src().deviceId(), pnum, true)); |
| 336 | } |
| 337 | } else { |
| 338 | // find dual homed hosts on this dev to disable |
| 339 | Set<PortNumber> dhp = srManager.hostHandler |
| 340 | .getDualHomedHostPorts(link.src().deviceId()); |
| 341 | log.warn("Link src {} -->dst {} removed was the last uplink, " |
| 342 | + "disabling dual homed ports: {}", link.src().deviceId(), |
| 343 | link.dst().deviceId(), (dhp.isEmpty()) ? "no ports" : dhp); |
| 344 | dhp.forEach(pnum -> srManager.deviceAdminService |
| 345 | .changePortState(link.src().deviceId(), pnum, false)); |
| 346 | if (!dhp.isEmpty()) { |
| 347 | // update global store |
| 348 | Set<PortNumber> p = downedPortStore.get(link.src().deviceId()); |
| 349 | if (p == null) { |
| 350 | p = dhp; |
| 351 | } else { |
| 352 | p.addAll(dhp); |
| 353 | } |
| 354 | downedPortStore.put(link.src().deviceId(), p); |
| 355 | } |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /** |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 360 | * Returns true if given link is the only active uplink from src-device of |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 361 | * link. An uplink is defined as a unidirectional link with src as |
| 362 | * edgeRouter and dst as non-edgeRouter. |
| 363 | * |
| 364 | * @param link |
| 365 | * @return true if given link is-the-first/was-the-last uplink from the src |
| 366 | * device |
| 367 | */ |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 368 | private boolean onlyUplink(Link link) { |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 369 | DeviceConfiguration devConfig = srManager.deviceConfiguration; |
| 370 | try { |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 371 | if (!devConfig.isEdgeDevice(link.src().deviceId()) |
| 372 | || devConfig.isEdgeDevice(link.dst().deviceId())) { |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 373 | return false; |
| 374 | } |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 375 | // note that using linkservice here would cause race conditions as |
| 376 | // more links can show up while the app is still processing the first one |
| 377 | Set<Link> devLinks = seenLinks.entrySet().stream() |
| 378 | .filter(entry -> entry.getKey().src().deviceId() |
| 379 | .equals(link.src().deviceId())) |
| 380 | .filter(entry -> entry.getValue()) |
| 381 | .filter(entry -> !entry.getKey().equals(link)) |
| 382 | .map(entry -> entry.getKey()) |
| 383 | .collect(Collectors.toSet()); |
| 384 | |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 385 | for (Link l : devLinks) { |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 386 | if (devConfig.isEdgeDevice(l.dst().deviceId())) { |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 387 | continue; |
| 388 | } |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 389 | log.debug("Link {} is not the only active uplink. Found another" |
| 390 | + "link {}", link, l); |
| 391 | return false; |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 392 | } |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 393 | log.debug("Link {} is the only uplink", link); |
| 394 | return true; |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 395 | } catch (DeviceConfigNotFoundException e) { |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 396 | log.warn("Unable to determine if link is only uplink" |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 397 | + e.getMessage()); |
| 398 | } |
| 399 | return false; |
| 400 | } |
| 401 | |
| 402 | /** |
| 403 | * Returns true if this controller instance has seen this link before. The |
| 404 | * link may not be currently up, but as long as the link had been seen |
| 405 | * before this method will return true. The one exception is when the link |
| 406 | * was indeed seen before, but this controller instance was forced to forget |
| 407 | * it by a call to purgeSeenLink method. |
| 408 | * |
| 409 | * @param link the infrastructure link being queried |
| 410 | * @return true if this controller instance has seen this link before |
| 411 | */ |
| 412 | boolean isSeenLink(Link link) { |
| 413 | return seenLinks.containsKey(link); |
| 414 | } |
| 415 | |
| 416 | /** |
| 417 | * Updates the seen link store. Updates can be for links that are currently |
| 418 | * available or not. |
| 419 | * |
| 420 | * @param link the link to update in the seen-link local store |
| 421 | * @param up the status of the link, true if up, false if down |
| 422 | */ |
| 423 | void updateSeenLink(Link link, boolean up) { |
| 424 | seenLinks.put(link, up); |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * Returns the status of a seen-link (up or down). If the link has not been |
| 429 | * seen-before, a null object is returned. |
| 430 | * |
| 431 | * @param link the infrastructure link being queried |
| 432 | * @return null if the link was not seen-before; true if the seen-link is |
| 433 | * up; false if the seen-link is down |
| 434 | */ |
| 435 | private Boolean isSeenLinkUp(Link link) { |
| 436 | return seenLinks.get(link); |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * Makes this controller instance forget a previously seen before link. |
| 441 | * |
| 442 | * @param link the infrastructure link to purge |
| 443 | */ |
| 444 | private void purgeSeenLink(Link link) { |
| 445 | seenLinks.remove(link); |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * Returns the status of a link as parallel link. A parallel link is defined |
| 450 | * as a link which has common src and dst switches as another seen-link that |
| 451 | * is currently enabled. It is not necessary for the link being queried to |
| 452 | * be a seen-link. |
| 453 | * |
| 454 | * @param link the infrastructure link being queried |
| 455 | * @return true if a seen-link exists that is up, and shares the same src |
| 456 | * and dst switches as the link being queried |
| 457 | */ |
| 458 | private boolean isParallelLink(Link link) { |
| 459 | for (Entry<Link, Boolean> seen : seenLinks.entrySet()) { |
| 460 | Link seenLink = seen.getKey(); |
| 461 | if (seenLink.equals(link)) { |
| 462 | continue; |
| 463 | } |
| 464 | if (seenLink.src().deviceId().equals(link.src().deviceId()) |
| 465 | && seenLink.dst().deviceId().equals(link.dst().deviceId()) |
| 466 | && seen.getValue()) { |
| 467 | return true; |
| 468 | } |
| 469 | } |
| 470 | return false; |
| 471 | } |
| 472 | |
| 473 | /** |
| 474 | * Returns true if the link being queried is a bidirectional link. A bidi |
| 475 | * link is defined as a link, whose reverse link - ie. the link in the |
| 476 | * reverse direction - has been seen-before and is up. It is not necessary |
| 477 | * for the link being queried to be a seen-link. |
| 478 | * |
| 479 | * @param link the infrastructure link being queried |
| 480 | * @return true if another unidirectional link exists in the reverse |
| 481 | * direction, has been seen-before and is up |
| 482 | */ |
| 483 | boolean isBidirectional(Link link) { |
| 484 | Link reverseLink = linkService.getLink(link.dst(), link.src()); |
| 485 | if (reverseLink == null) { |
| 486 | return false; |
| 487 | } |
| 488 | Boolean result = isSeenLinkUp(reverseLink); |
| 489 | if (result == null) { |
| 490 | return false; |
| 491 | } |
| 492 | return result.booleanValue(); |
| 493 | } |
| 494 | |
| 495 | /** |
| 496 | * Determines if the given link should be avoided in routing calculations by |
| 497 | * policy or design. |
| 498 | * |
| 499 | * @param link the infrastructure link being queried |
| 500 | * @return true if link should be avoided |
| 501 | */ |
| 502 | boolean avoidLink(Link link) { |
| 503 | // XXX currently only avoids all pair-links. In the future can be |
| 504 | // extended to avoid any generic link |
| 505 | DeviceId src = link.src().deviceId(); |
| 506 | PortNumber srcPort = link.src().port(); |
| 507 | DeviceConfiguration devConfig = srManager.deviceConfiguration; |
| 508 | if (devConfig == null || !devConfig.isConfigured(src)) { |
| 509 | log.warn("Device {} not configured..cannot avoid link {}", src, |
| 510 | link); |
| 511 | return false; |
| 512 | } |
| 513 | DeviceId pairDev; |
| 514 | PortNumber pairLocalPort, pairRemotePort = null; |
| 515 | try { |
| 516 | pairDev = devConfig.getPairDeviceId(src); |
| 517 | pairLocalPort = devConfig.getPairLocalPort(src); |
| 518 | if (pairDev != null) { |
| 519 | pairRemotePort = devConfig |
| 520 | .getPairLocalPort(pairDev); |
| 521 | } |
| 522 | } catch (DeviceConfigNotFoundException e) { |
| 523 | log.warn("Pair dev for dev {} not configured..cannot avoid link {}", |
| 524 | src, link); |
| 525 | return false; |
| 526 | } |
| 527 | |
| 528 | return srcPort.equals(pairLocalPort) |
| 529 | && link.dst().deviceId().equals(pairDev) |
| 530 | && link.dst().port().equals(pairRemotePort); |
| 531 | } |
| 532 | |
| 533 | /** |
| 534 | * Cleans up internal LinkHandler stores. |
| 535 | * |
| 536 | * @param device the device that has been removed |
| 537 | */ |
| 538 | void processDeviceRemoved(Device device) { |
| 539 | seenLinks.keySet() |
| 540 | .removeIf(key -> key.src().deviceId().equals(device.id()) |
| 541 | || key.dst().deviceId().equals(device.id())); |
| 542 | } |
| 543 | |
| 544 | /** |
| 545 | * Administratively disables the host location switchport if the edge device |
| 546 | * has no viable uplinks. |
| 547 | * |
| 548 | * @param loc one of the locations of the dual-homed host |
| 549 | */ |
| 550 | void checkUplinksForDualHomedHosts(HostLocation loc) { |
| 551 | try { |
| 552 | for (Link l : srManager.linkService.getDeviceLinks(loc.deviceId())) { |
| 553 | if (srManager.deviceConfiguration.isEdgeDevice(l.dst().deviceId()) |
| 554 | || l.state() == Link.State.INACTIVE) { |
| 555 | continue; |
| 556 | } |
| 557 | // found valid uplink - so, nothing to do |
| 558 | return; |
| 559 | } |
| 560 | } catch (DeviceConfigNotFoundException e) { |
| 561 | log.warn("Could not check for valid uplinks due to missing device" |
| 562 | + "config " + e.getMessage()); |
| 563 | return; |
| 564 | } |
| 565 | log.warn("Dual homed host location {} has no valid uplinks; " |
| 566 | + "disabling dual homed port", loc); |
| 567 | srManager.deviceAdminService.changePortState(loc.deviceId(), loc.port(), |
| 568 | false); |
| 569 | Set<PortNumber> p = downedPortStore.get(loc.deviceId()); |
| 570 | if (p == null) { |
| 571 | p = Sets.newHashSet(loc.port()); |
| 572 | } else { |
| 573 | p.add(loc.port()); |
| 574 | } |
| 575 | downedPortStore.put(loc.deviceId(), p); |
| 576 | } |
| 577 | |
Saurav Das | 6430f41 | 2018-01-25 09:49:01 -0800 | [diff] [blame] | 578 | ImmutableMap<Link, Boolean> getSeenLinks() { |
| 579 | return ImmutableMap.copyOf(seenLinks); |
| 580 | } |
| 581 | |
| 582 | ImmutableMap<DeviceId, Set<PortNumber>> getDownedPorts() { |
| 583 | return ImmutableMap.copyOf(downedPortStore.entrySet()); |
| 584 | } |
| 585 | |
Saurav Das | e6c448a | 2018-01-18 12:07:33 -0800 | [diff] [blame] | 586 | } |