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Mobile Broadband Driver Development for Windows 7

Mobile Broadband Driver Development for Windows 7. Malayala Srinivasan (Srini) Senior Program Manager Lead Wireless WAN - Microsoft IDC r.malayala.srinivasan@microsoft.com. Agenda. Session Goals Mobile Broadband in Windows 7 Driver Design Challenges Driver Development Stages

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Mobile Broadband Driver Development for Windows 7

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  1. Mobile Broadband Driver Development for Windows 7 Malayala Srinivasan (Srini) Senior Program Manager Lead Wireless WAN - Microsoft IDC r.malayala.srinivasan@microsoft.com

  2. Agenda • Session Goals • Mobile Broadband in Windows 7 • Driver Design Challenges • Driver Development Stages • Call to Action

  3. Session Goals • This session is targeted for the Mobile Broadband driver developer community and will: • Introduce Mobile Broadband (MB) driver development for Windows 7 • Identify and prepare for key driver design areas in Windows 7 • Help in getting ready for MB driver development in Windows 7

  4. Terminology • Mobile Broadband is also referred as • Wireless WAN • WWAN • MB • VAN UI – View Available Networks UI is • Windows Vista’s “Connect to network” UI equivalent in Windows 7 • Launched either through “Connect To” or “Network Tray Icon” • Mobile Broadband Driver is also referred as • IHV Miniport Driver • MB Driver • Miniport Driver

  5. Mobile Broadband in Windows 7 • Driver developers must use the “Mobile Broadband Driver Model Specification” for Windows 7 • Supports packet-switched data connectivity over the Wireless WAN (3GPP / 3GPP2) devices • Based on NDIS6.20 miniport driver model • Control path designed for slow response devices (AT command based) • Data path optimized for Wireless WAN devices • New logo program for Mobile Broadband devices in Windows 7 • New APIs for Mobile Broadband user-mode application development in Windows 7

  6. Windows 7 Mobile Broadband Architecture Provided by: Microsoft View Available Network UI Connection Flow Experience UI Properties UI 3rd Party Connection Manager ISV Command Line Interface User Mode IHV Mobile Broadband API OEM Profiles WWAN Service Session 0 NDISUIO Kernel Mode Mobile Broadband Driver Model WWAN Miniport Driver WWAN Miniport Driver MB Miniport Driver

  7. NDIS6.20 Data Path Optimizations for MB Devices Windows Vista Windows 7 TCP/IP Stack TCP/IP Stack NDIS 6.0 NDIS 6.20 Send / Receive Send / Receive 802.3 Frames IP Frames IHV Miniport Driver IHV Miniport Driver DHCP Emulation ARP Emulation • Windows 7 IHV Miniport Drivers for Mobile Broadband can: • Take advantage of raw IP support in send/receive path • Eliminate DHCP and ARP spoofing in miniport drivers

  8. Control Path Functionalities • Mobile Broadband Driver Model defines the following control path functionalities for the IHV drivers • Device State Management • Connectivity Management • Radio Control • SMS (Short Message Services) • PIN • Provisioned Contexts • Service Activation • Vendor Specific

  9. Control Path for Mobile Broadband Drivers • WWAN Service uses NDIS OIDs for control requests (SET or QUERY) to miniport drivers. • Miniport drivers can respond asynchronously to WWAN Service. • Device state changes can be notified to WWAN service using event notification by miniport drivers

  10. Asynchronous Response WWAN Service Miniport Driver NdisOidRequest • Designed for slow responding AT command based devices • Initiated by WWAN Service • 2 Types : SET or QUERY • RequestId is Non-NULL Oid = OID_WWAN_CONNECT RequestHandle = 0x12345678 RequestId = 0x0000F00D … AT Cmd(s) to Device Return NDIS_STATUS_INDICATION_REQUIRED Device Responds NdisMIndicateStatusEx StatusCode = NDIS_STATUS_WWAN_CONTEXT_STATE DestinationHandle = 0x12345678 RequestId = 0x0000F00D ActivationState = WwanActivationStateActivated …

  11. Event Notification • Used for device or network state changes • Initiated by driver • Request Id = NULL WWAN Service Miniport Driver Device / Network state change NdisMIndicateStatusEx StatusCode = NDIS_STATUS_WWAN_CONTEXT_STATE RequestId = 0x0 ActivationState = WwanActivationStateDeactivated …

  12. Custom IHV Features 3rd Party Apps / Connection Managers Set VendorSpecific • Framework provides vendor-specific OID for driver developers to implement IHV specific features • WWAN Service provides a pass-through control path for Windows 7 applications to communicate with IHV drivers OnEventNotification WWAN Service NDIS_STATUS_WWAN_ VENDOR_SPECIFIC OID_WWAN_VENDOR_SPECIFIC MB Miniport Driver

  13. Driver Design Challenges

  14. OID Handler Implementation • Understand AT commands and response from device. • Responding to each OID may require sending multiple AT commands to device. • Incorrect string processing in kernel mode may result in fatal failures. • See “Using Safe String Functions” in the WDKhttp://msdn.microsoft.com/en-us/library/aa489552.aspx • Partner with your Connection Manager application developer or firmware engineer to get more insight on AT command semantics. • Some OID requests may require using device-specific AT commands. • Some OID responses (e.g, network error code, service activation, and raw IP handling) may require firmware changes. Partner with your device firmware team to get firmware changed.

  15. Asynchronous OID Handling • WWAN Service may send multiple OIDs without waiting for the completion of the current OID request. • Driver developers should design query OID handlers to send the requests to the device without serializing. • For out-of-sequence device responses, use command tag in the response to associate the response with the corresponding request.

  16. IHV and Operator-specific Commands • Use OID_WWAN_VENDOR_SPECIFIC to implement custom features. For example: • SIM Tool Kit (STK) Commands • USSD Commands • Phonebook Commands • Voice Commands • Firmware-specific commands • And more … • Use OID_WWAN_SERVICE_ACTIVATION to implement operator-specific service activation.

  17. Staged Driver Development

  18. High Level Tasks • Stage * Available at the time of Windows 7 Beta Test the driver in each stage

  19. Development Best Practices • Plan and implement the following items early in the development cycle of a Mobile Broadband driver : • Log the AT commands and responses in a file. Helps in debugging and root cause analysis. • Use Event Tracing to log configuration and network issues. • NdisWriteErrorLogEntry DDI for logging driver-related errors • NdisWriteEventLogEntry DDI for logging generic or network-related issues • Use the optional description member “StringsList” to log meaningful and actionable information regarding the error.

  20. Call To Action • Migrate existing NDIS 5.x mobile broadband drivers to NDIS 6.0 • Helps in moving to NDIS 6.20-based Mobile Broadband Miniport model. • MB devices must be NDIS 6.20-based to get logo. • Prepare for testing commercially deployed Mobile Broadband device solutions in Windows 7. • Get ready for Windows 7-based driver development. • WDK will be available at the time of Windows 7 Beta. • Review Mobile Broadband device logo requirements and send us feedback. • Contact us at win7mb@microsoft.com

  21. Resources • Mobile Broadband Logo Requirements on https://winqual.microsoft.com/ • Log in, click on the Logopoint link on the left side menu, and search for “MBN” requirements. • WDK Documentation on MSDN • Porting NDIS 5.x Drivers to NDIS 6.0http://msdn.microsoft.com/hi-in/library/ms795567(en-us).aspx • IP Helperhttp://msdn.microsoft.com/hi-in/library/bb742902(en-us).aspx • Check the Windows 7 Beta release for additional resources: • WDK documentation • Mobile Broadband Driver Model Specification • Mobile Broadband Driver Test App (WwanDriverTestApp) • NDIS 6.20 • SDK documentation • Mobile Broadband API Specification • Windows Logo Kit (WLK) • Mobile Broadband Logo Tests • WHDC Web site at http://www.microsoft.com/whdc/default.mspx • Mobile Broadband Driver Development White Paper

  22. Related Sessions

  23. Thank You!

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