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Device Driver Framework Discussion

Device Driver Framework Discussion. September 2014. Introduce Myself. Steve Dean Development Engineer Hewlett-Packard Working on HP’s SDN Controller for the past 2 years Contact info: sdean@hp.com , 916-785-3429. Agenda. What is a Device Driver Framework

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Device Driver Framework Discussion

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  1. Device Driver Framework Discussion September 2014

  2. Introduce Myself • Steve Dean • Development Engineer • Hewlett-Packard • Working on HP’s SDN Controller for the past 2 years • Contact info: sdean@hp.com, 916-785-3429

  3. Agenda • What is a Device Driver Framework • Use-cases to illustrate the concept • High level description of HP’s design • Discussion, Q&A

  4. What is a Device Driver Framework? • A framework that provides a standard and consistent way to implement device specific functionality • Device Specific Functionality • Often referred to as “Drivers”, or “Facets” • Code that performs some function and is knowledgeable of the capabilities and limitation of a Device • Framework: • Extensible to allow dynamic support for new device types • Extensible to allow new device specific functionality to be dynamically added

  5. Use-Cases • Validate and Adjust FlowMods • Validate and adjust FlowMods to be sent to a device based on knowledge of the type of device • FlowMods adjustments can be made to take advantages of capabilities of the device • VLAN Configuration • Perform VLAN CRUD operations using communication protocols such as SNMP, NetConf, CLI • VxLAN Configuration • Perform VxLAN CRUD operations using communication protocols such as SNMP, NetConf • Any device specific functionality

  6. Major Components • Identification (Discovery) • Determines the type of each device using information discovered through OpenFlow handshakes, as well as direct interaction with the device • Communicate with device to discovery configuration information that may affect the devices capabilities and limitations • Device Type Repository • Maintains identity information about the types of devices recognized by the framework • Maintains the Drivers that can use be with specific Device Types • Device Management • Maintain (persist) the discovered device information (eg, device type, port status) • API to allow applications to obtain device information • Security Credential Repository • Maintain and manage security credentials to allow interaction with devices • API to allow applications to obtain security information and populate the repository • Device Drivers • Device specific software components that make use of the information about the type of device

  7. Component Diagram Device Service Device Manager Application 9 Device Driver Service Device Driver Manager Device Supplier Service DB 1 3 Device Type XML 8 Device Supplier Device Supplier Device Supplier 4 OF Device Discovery Driver 5 2 7 Key Service DB 6 Key Manager

  8. Component Diagram Device Service Device Manager Application Driver Device Supplier Service DB Key Service DB Key Manager

  9. Device Type Repository BaseSwitch.xml • Device Type Name = Default Switch • Device Type = HP Switch • Extends Default Switch • Vendor=HP • Device Identity Handler Driver • Interface Handler Driver • Notification Handler Driver HP.xml Cisco.xml 3800.xml 5400.xml 5900.xml • Device Type = 5400 • Extends HP Switch • Flags = isChassis • Device Type = J9642A, Extends 5400, Product=Switch 5406zl, OID=1.3.6.1.4.1.11.2.3.7.11.50, FlowMod Driver • Device Type = J9643A, Extends 5400, Product=Switch 5412zl, OID=1.3.6.1.4.1.11.2.3.7.11.51, FlowMod Driver 9

  10. Evolution Process • Example: 5406z1 that allows V1 modules, OF info is mfr=HP, hw=5400 v1.2.3, sw=KA_1_2_3 • Step 1: Use OF information (mfr=HP, hw=5400 v1.2.3, sw=KA_1_2_3) to determine the device type is HP Switch • Step 2: Use DeviceIdentityHandler Driver to fetch snmpsysOid from device • Step 3: Use sysOidto determine device is 5406zl • Step 4: We learn from the xml data that the device is a chassis • Step 5: Use DeviceIdentityHandler Driverto fetch AllowV1 mib object • Step 6: AllowV1 mib object tells us the device allows V1 modules • Device Type = Default Switch BaseSwitch.xml • Device Type = HP Switch • Extends Default Switch • Vendor=HP • DeviceIdentityHandlerDriver HP.xml 5400.xml • Device Type = 5400 • Extends HP Switch • Flags = isChassis • DeviceIdentityHandler Driver • Device Type = J9642A, Extends 5400, Product=Switch 5406zl, OID=1.3.6.1.4.1.11.2.3.7.11.50, Facet=OpenFlow • Device Type = J9643A, Extends 5400, Product=Switch 5412zl, OID=1.3.6.1.4.1.11.2.3.7.11.51, Facet=OpenFlow

  11. Application Usage • Device Service Interface • Get Device object • Eg, Set<Device> getDevice(DeviceFilter filter) • Get Interface information • Eg, List<Interface> getInterfaces(Device device) • Device and Interface notifications • Eg, addListener(DeviceListener listener) • Device Interface • Eg, Boolean isOnline() • Eg, Set<String> getDriverrClassNames() • Eg, Boolean isSupprted(Class<? extends Driver> driverClass) • Eg, <T extends Driver> T getDriver(DriverClass<T> driverClass)

  12. Q & A • Is this something you think is useful? • Is there work in other areas to accomplish the same thing that I’m not aware of?

  13. Backup Slides

  14. ODL Architecture and Design Decisions • Device Type Repository • How to represent device type information (eg, xml) • How and where to store in-memory device type information (MD-SAL data store) • Define how new device type information can be dynamically added to the system • Identification (Discovery) • Define phase 1 discovery components (OpenFlow, Manual) • Define “evolution” process • Device Management • Do we want to maintain device information • Define how to store in-memory device information and what should be stored (MD-SAL data store) • Define API

  15. ODL Architecture and Design Decisions continued • Security Repository • Define how to store security information (MD-SAL data store) • Define how to populate security repository • Define API • Device Drivers • Define how to implement device drivers • Can device drivers be implemented as “routed” RPCs and associated with a device inventory node in the MD-SAL data store? • Define how new device drivers can be dynamically added to the system

  16. ODL Component Diagram – Option 1 Application Driver 3800 Driver 5400 Nodes Routed RPCS MD-SAL Node 5400 3800 Identification (Discovery) determines device type and augments data store and registers Routed RPC. Applications use MD-SAL services. Augment Data Store Register RPCs GUI/REST/ Notification Credential Manager Identification (Discovery) Device Driver Manager

  17. ODL Component Diagram – Option 2 Hide MD-SAL from Applications Application Device Manager Driver 3800 Driver 5400 Nodes Routed RPCS MD-SAL Node 5400 3800 Augment Data Store Register RPCs GUI/REST/ Notification Credential Manager Identification (discovery) Device Driver Manager

  18. ODL Component Diagram – Option 3 Application Driver 3800 Driver 5400 Device Manager Nodes MD-SAL Routed RPCS Augment Data Store Node 5400 3800 Register RPCs Device Manger provides Application API and Identification API. Device Manager is the only component that is MD-SAL aware. Augment Data Store Register RPCs Credential Manager GUI/REST/ Notification Identification (Discovery) Device Driver Manager

  19. Terminology • Facet: Software that is used to perform a function that does not require interaction with the device, but required knowledge of the device. • Eg, FlowMod Facet (validate and adjust FlowMods based on hardware capabilities and limitations). • HandlerFacet: Software that is used to perform a function that requires interaction with a device. • Eg, interact with a device to discover how it’s configured. • Eg, VxLAN Tunnel Endpoint configuration. • Facets and HandlerFacets are associated with a specific type of device and their implementation is specified in the Device Type XML file.

  20. HP.xml <deviceDriver description="HP device driver for switches"> <type name="HP Switch" extends="Default Switch"> <facet name="com.hp.device.DeviceIdentityHandler" class="com.hp.sdn.dvc.facet.impl.HpDeviceIdentityHandler"/> <facet name="com.hp.sdn.dvc.facet.InterfaceHandler" class="com.hp.sdn.dvc.facet.impl.SnmpInterfaceHandler"/> <facet name="com.hp.sdn.dvc.facet.NotificationHandler" class="com.hp.sdn.dvc.facet.impl.SnmpNotificationHandler"/> <vendor>HP</vendor> </type> </deviceDriver>

  21. 5400.xml <deviceDriver description="HP 5400 Switch"> <type name="5400" extends="HP Switch"> <facet name="com.hp.sdn.dvc.facet.FlowModFacet" class="com.hp.sdn.dvc.facet.impl.FlowModFacetFactory"/> <family>ProCurve 5400zl</family> <product>5400</product> <flag name="isChassis" /> </type> <type name="J9642A" extends="5400" description="5406zl"> <oid>.1.3.6.1.4.1.11.2.3.7.11.50</oid> <model>J9642A</model> <product>Switch 5406zl</product> </type> <type name="J9643A" extends="5400" description="5412zl"> <oid>.1.3.6.1.4.1.11.2.3.7.11.51</oid> <model>J9643A</model> <product>Switch 5412zl</product> </type> </deviceDriver>

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