Jonathan Hart | 1912afc | 2013-10-11 12:02:44 +1300 | [diff] [blame^] | 1 | package net.onrc.onos.ofcontroller.bgproute; |
| 2 | |
| 3 | import java.io.IOException; |
| 4 | import java.util.ArrayList; |
| 5 | import java.util.Collections; |
| 6 | import java.util.Comparator; |
| 7 | import java.util.HashMap; |
| 8 | import java.util.List; |
| 9 | import java.util.Map; |
| 10 | |
| 11 | import net.floodlightcontroller.core.IFloodlightProviderService; |
| 12 | import net.floodlightcontroller.core.IOFSwitch; |
| 13 | |
| 14 | import org.openflow.protocol.OFFlowMod; |
| 15 | import org.openflow.protocol.OFMessage; |
| 16 | import org.openflow.protocol.OFPort; |
| 17 | import org.openflow.util.HexString; |
| 18 | import org.slf4j.Logger; |
| 19 | import org.slf4j.LoggerFactory; |
| 20 | |
| 21 | public class FlowCache { |
| 22 | private static Logger log = LoggerFactory.getLogger(FlowCache.class); |
| 23 | |
| 24 | private IFloodlightProviderService floodlightProvider; |
| 25 | |
| 26 | private Map<Long, List<OFFlowMod>> flowCache; |
| 27 | |
| 28 | private Comparator<OFFlowMod> cookieComparator = new Comparator<OFFlowMod>() { |
| 29 | @Override |
| 30 | public int compare(OFFlowMod fm1, OFFlowMod fm2) { |
| 31 | long difference = fm2.getCookie() - fm1.getCookie(); |
| 32 | |
| 33 | if (difference > 0) { |
| 34 | return 1; |
| 35 | } |
| 36 | else if (difference < 0) { |
| 37 | return -1; |
| 38 | } |
| 39 | else { |
| 40 | return 0; |
| 41 | } |
| 42 | } |
| 43 | }; |
| 44 | |
| 45 | public FlowCache(IFloodlightProviderService floodlightProvider) { |
| 46 | this.floodlightProvider = floodlightProvider; |
| 47 | |
| 48 | flowCache = new HashMap<Long, List<OFFlowMod>>(); |
| 49 | } |
| 50 | |
| 51 | public synchronized void write(long dpid, OFFlowMod flowMod) { |
| 52 | List<OFFlowMod> flowModList = new ArrayList<OFFlowMod>(1); |
| 53 | flowModList.add(flowMod); |
| 54 | write(dpid, flowModList); |
| 55 | } |
| 56 | |
| 57 | public synchronized void write(long dpid, List<OFFlowMod> flowMods) { |
| 58 | ensureCacheForSwitch(dpid); |
| 59 | |
| 60 | List<OFFlowMod> clones = new ArrayList<OFFlowMod>(flowMods.size()); |
| 61 | |
| 62 | //Somehow the OFFlowMods we get passed in will change later on. |
| 63 | //No idea how this happens, but we can just clone to prevent problems |
| 64 | try { |
| 65 | for (OFFlowMod fm : flowMods) { |
| 66 | clones.add(fm.clone()); |
| 67 | } |
| 68 | } catch (CloneNotSupportedException e) { |
| 69 | log.debug("Clone exception", e); |
| 70 | } |
| 71 | |
| 72 | flowCache.get(dpid).addAll(clones); |
| 73 | |
| 74 | IOFSwitch sw = floodlightProvider.getSwitches().get(dpid); |
| 75 | |
| 76 | if (sw == null) { |
| 77 | log.debug("Switch not found when writing flow mods"); |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | List<OFMessage> msgList = new ArrayList<OFMessage>(clones.size()); |
| 82 | msgList.addAll(clones); |
| 83 | |
| 84 | try { |
| 85 | sw.write(msgList, null); |
| 86 | } catch (IOException e) { |
| 87 | log.error("Error writing to switch", e); |
| 88 | } |
| 89 | |
| 90 | |
| 91 | } |
| 92 | |
| 93 | public synchronized void delete(long dpid, OFFlowMod flowMod) { |
| 94 | List<OFFlowMod> flowModList = new ArrayList<OFFlowMod>(1); |
| 95 | flowModList.add(flowMod); |
| 96 | delete(dpid, flowModList); |
| 97 | } |
| 98 | |
| 99 | public synchronized void delete(long dpid, List<OFFlowMod> flowMods) { |
| 100 | ensureCacheForSwitch(dpid); |
| 101 | |
| 102 | //Remove the flow mods from the cache first before we alter them |
| 103 | flowCache.get(dpid).removeAll(flowMods); |
| 104 | |
| 105 | //Alter the original flow mods to make them delete flow mods |
| 106 | for (OFFlowMod fm : flowMods) { |
| 107 | fm.setCommand(OFFlowMod.OFPFC_DELETE_STRICT) |
| 108 | .setOutPort(OFPort.OFPP_NONE) |
| 109 | .setLengthU(OFFlowMod.MINIMUM_LENGTH); |
| 110 | |
| 111 | fm.getActions().clear(); |
| 112 | } |
| 113 | |
| 114 | IOFSwitch sw = floodlightProvider.getSwitches().get(dpid); |
| 115 | if (sw == null) { |
| 116 | log.debug("Switch not found when writing flow mods"); |
| 117 | return; |
| 118 | } |
| 119 | |
| 120 | List<OFMessage> msgList = new ArrayList<OFMessage>(flowMods.size()); |
| 121 | msgList.addAll(flowMods); |
| 122 | |
| 123 | try { |
| 124 | sw.write(msgList, null); |
| 125 | } catch (IOException e) { |
| 126 | log.error("Error writing to switch", e); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | //TODO can the Prontos handle being sent all flow mods in one message? |
| 131 | public synchronized void switchConnected(IOFSwitch sw) { |
| 132 | log.debug("Switch connected: {}", sw); |
| 133 | |
| 134 | ensureCacheForSwitch(sw.getId()); |
| 135 | |
| 136 | List<OFFlowMod> flowMods = flowCache.get(sw.getId()); |
| 137 | |
| 138 | Collections.sort(flowMods, cookieComparator); |
| 139 | |
| 140 | sw.clearAllFlowMods(); |
| 141 | |
| 142 | List<OFMessage> messages = new ArrayList<OFMessage>(flowMods.size()); |
| 143 | messages.addAll(flowMods); |
| 144 | |
| 145 | try { |
| 146 | sw.write(messages, null); |
| 147 | } catch (IOException e) { |
| 148 | log.error("Failure writing flow mods to switch {}", |
| 149 | HexString.toHexString(sw.getId())); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | private void ensureCacheForSwitch(long dpid) { |
| 154 | if (!flowCache.containsKey(dpid)) { |
| 155 | flowCache.put(dpid, new ArrayList<OFFlowMod>()); |
| 156 | } |
| 157 | } |
| 158 | } |