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Device Driver Framework Project

Device Driver Framework Project. October 2014. Problem. How do we deal with devices with different capabilities and limitations? Even though Openflow is a standard, devices have different Openflow capabilities Need a way to implement Device Specific Functionality

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Device Driver Framework Project

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  1. Device Driver Framework Project October 2014

  2. Problem • How do we deal with devices with different capabilities and limitations? • Even though Openflow is a standard, devices have different Openflow capabilities • Need a way to implement Device Specific Functionality • Solution: Device Driver Framework

  3. 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” • Code that performs some function, and that code 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

  4. 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 adjusted 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

  5. Major Components • Device Type Repository • Maintains identity information about the types of physical devices recognized by the framework • Identification • Determines the type of each physical 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 Management • Maintain (persist??) the discovered device information (eg, device type, port status) • API to allow applications to obtain device information • Security Repository • Maintain and manage security credentials to allow interaction with devices • API to allow applications to obtain security information • Device Drivers • Device specific software components that makes use of the information about the type of device

  6. 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 Identification Driver 5 2 7 Key Service DB 6 Key Manager

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

  8. 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)

  9. 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 routed RPC service. Augment Data Store Register RPCs GUI/REST/ Notification Credential Manager Identification (Discovery) Device Driver Manager

  10. 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 - Apps do not need to be MD-SAL aware - Preserve existing APIs Register RPCs GUI/REST/ Notification Credential Manager Identification (discovery) Device Driver Manager

  11. 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. Store security Keys in MD-SAL Data store Augment Data Store Register RPCs Credential Manager GUI/REST/ Notification Identification (Discovery) Device Driver Manager

  12. Status • Project Proposal posted to ODL wiki 2 weeks ago • Learning ODL and MD-SAL • Prototyping and porting some HP code to ODL • Openflow identification • Key Manager • Device Driver Manager • SNMP library • Augment inventory node with device type • Register drivers as routed RPCs • Simple test application

  13. Concerns • MD-SAL data store encryption • Nice to have MD-SAL encrypt data • Currently we encrypt before storing in MD-SAL data store • Prevents use of RestConf to read/write Key data • Config Subsystem • Difficult to learn, takes too much time to learn • Better documentation will help • Routed RPCs (yang) • How to pass a flowmod type as an input parameter • How to return a set of flowmods as an output parameter • How to specific complex types and Sets in yang model

  14. 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 • 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. 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. Q & A

  17. Device Type Repository BaseSwitch.xml • Device Type Name = Default Switch • Device Type = HP Switch • Extends Default Switch • Vendor=HP • Device Identity Driver • Interface Driver • Notification 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 17

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