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Code Block
languagejava
titleHow to create and use Group
firstline1
linenumberstrue
collapsetrue
{
    Collection<TrafficTreatment>List<GroupBucket> groupBucketsbuckets = new ArrayList<TrafficTreatment>ArrayList<GroupBucket>();
	List<PortNumber> outPorts = getPortsToDevice(srcDevice, neighborDevice);

    for (PortNumber portNumber: outPorts) {
        TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder();
        tBuilder.setOutput(portNumber)
                .setEthDst(getRouterMacAddress(neighborDevice))
                .setEthSrc(getRouterMacAddress(srcDevice))
                .pushMpls()
                .setMpls(getMplsId(finalDstDevice));
        groupBucketsbuckets.add(GroupBucket.createSelectGroupBucket(tBuilder.build()));
    }
    GroupBuckets groupBuckets = new GroupBuckets(buckets);
	GroupKey gorupKeygroupKey = SegmentRoutingGroupKey.build(srcDevice, Collection<NeighborDevice>, dstDevice);
 
	GroupDescription groupDesc =  Future<Group> future = groupService.createGroupnew DefaultGroupDescription(srcDevice, Group.Type.SELECT,
            groupBuckets, groupKey, getAppId());
    Group group = future.get(groupService.addGroup(groupDesc);
}
 
public void SetIpRule() {
....
	GroupKey gorupKey = SegmentRoutingGroupKey.build(srcDevice, Collection<NeighborDevice>, dstDevice);
	Group group = groupService.getGroup(srcDevice, groupKey);
	tbuilder.setGroup(group.id()).id());
....
 
}

Group Manager

This component implements the Group Service interface by defining Group create/modify/remove/query operations on devices.

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High level flow of events in the Group subsystem is depicted below when an operation like CreateGroup is submitted by the application to non-Master controller instance in a multi-instance environment.

Multi-instance Support

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Group Provider

  • Provides SB APIs towards core

    • CreateGroup(GroupId, Buckets)

    • ModifyGroup(GroupId, Buckets)

    • RemoveGroup(GroupId)

    • GetGroups()

OF Group Provider

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Implements Group Providers interface

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    • Code Block
      languagejava
      titleGroup Provider SB API
      /**
 * Abstraction of group provider.
 */
public interface GroupProvider extends Provider {
    /**
     * Perform a group operation in the specified device with the
     * specified parameters.
     *
     * @param deviceId device identifier on which the batch of group
     * operations to be executed
     * @param groupOps immutable list of group operation
     */
    void performGroupOperation(DeviceId deviceId,
                               GroupOperations groupOps);
}
    • Code Block
      languagejava
      titleGroup Provider Notifications to Northbound
      /**
 * Service through which Group providers can inject information into
 * the core.
 */
public interface GroupProviderService extends ProviderService<GroupProvider> {
    /**
     * Notifies core if any failure from data plane during group operations.
     *
     * @param operation offended group operation
     */
    void groupOperationFailed(GroupOperation operation);


    /**
     * Pushes the collection of group detected in the data plane along
     * with statistics.
     *
     * @param deviceId device identifier
     * @param groupEntries collection of group entries as seen in data plane
     */
    void pushGroupMetrics(DeviceId deviceId,
                       Collection<Group> groupEntries);
}

OF Group Provider

  • Implements Group Providers interface

  • Add listeners to OpenFlowController for any events
  • On DeviceConnected event, spawn a Group statistics collector per device that retrieves the Group descriptions and Group statistics
  • On receiving GROUP_DESC or STATS_REPLY for GROUPS, pass them to GroupStatsCollector module to combine them into a single notification event to be notified to core

  • Builds Open Flow GROUP_MOD (ADD/MOD/DELETE) Message depending on the group operation invocation and writes the message to switch driver

  • On GROUP_MOD failures, notifies the core with the correction Group operation information. To achieve this, OF Group Provider maintain a map of Open flow transaction Id and associated GroupOperation that was submitted from core. On receiving GROUP_DESC with the corresponding GroupId or receiving GROUP_MOD failed with the transaction Id, OF Group Provider should clear the map and notifies the core accordingly.

 

Class Diagram

Image Added

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OF Switch Driver

  • No changes

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