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IXP400 Software
Contents
Programmer’s Guide IXP400 Software Version 2.0 April 2005
Document Number: 252539, Revision: 007
Contents
1 Introduction..................................................................................................................................19
1.1 Versions Supported by this Document ...............................................................................19
1.2 Hardware Supported by this Release .................................................................................19
1.3 Intended Audience..............................................................................................................19
1.4 How to Use this Document .................................................................................................20
1.5 About the Processors .........................................................................................................20
1.6 Related Documents ............................................................................................................21
1.7 Acronyms............................................................................................................................22
2 Software Architecture Overview ................................................................................................27
2.1 High-Level Overview...........................................................................................................27
2.2 Deliverable Model...............................................................................................................28
2.3 Operating System Support .................................................................................................29
2.4 Development Tools.............................................................................................................29
2.5 Access Library Source Code Documentation .....................................................................29
2.6 Release Directory Structure................................................................................................30
2.7 Threading and Locking Policy.............................................................................................32
2.8 Polled and Interrupt Operation............................................................................................32
2.9 Statistics and MIBs .............................................................................................................32
2.10 Global Dependency Chart ..................................................................................................33
3 Buffer Management.....................................................................................................................35
3.1 What’s New.........................................................................................................................35
3.2 Overview.............................................................................................................................35
3.3 IXP_BUF Structure .............................................................................................................38
3.3.1 IXP_BUF Structure and Macros ............................................................................38
3.4 Mapping of IX_MBUF to Shared Structure .........................................................................43
3.5 IX_MBUF Structure.............................................................................................................44
3.6 Mapping to OS Native Buffer Types ...................................................................................46
3.6.1 VxWorks* M_BLK Buffer........................................................................................46
3.6.2 Linux* skbuff Buffer................................................................................................47
3.7 Caching Strategy ................................................................................................................49
3.7.1 Tx Path ..................................................................................................................49
3.7.2 Rx Path ..................................................................................................................50
3.7.3 Caching Strategy Summary...................................................................................50
4 Access-Layer Components:
ATM Driver Access (IxAtmdAcc) API.........................................................................................53
4.1 What’s New.........................................................................................................................53
4.2 Overview.............................................................................................................................53
4.3 IxAtmdAcc Component Features........................................................................................53
4.4 Configuration Services........................................................................................................55
4.4.1 UTOPIA Port-Configuration Service ......................................................................55
4.4.2 ATM Traffic-Shaping Services ...............................................................................55
4.4.3 VC-Configuration Services ....................................................................................56
4.5 Transmission Services........................................................................................................57