BSP Developer's Guide

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VxWorks 5.5 <strong>BSP</strong> Developer’s <strong>Guide</strong> H.3.1 Setting Up and Using a Memory Pool for Receive and Transmit Buffers Included with the network stack is netBufLib, a library that you can use to set up and manage a memory pool specialized to the buffering needs of networking applications such as ENDs and network protocols. To support buffer loaning and other features, netBufLib routines deal with data in terms of mBlks, clBlks, and clusters. As a consequence, a memory pool established using netPoolInit( ) is organized around a pool of mBlk structures, a pool of clBlk structures, and one or more pools of clusters. The netBufLib routines use the mBlk and clBlk structures to track information necessary to manage the data in the clusters. The clusters contain the data described by the mBlk and clBlk structures. The mBlk structure is the primary vehicle through which you access or pass the data that resides in a memory pool established by netPoolInit( ). Because an mBlk merely references the data, this lets network layers communicate data without actually having to copy the data. Another mBlk feature is chaining. This lets you pass an arbitrarily large amount of data by passing the mBlk at the head of an mBlk chain. See Figure H-3. In addition, because the mBlk structure references data through a clBlk structure, this makes it easy for multiple mBlks to share the same cluster. This ability is useful if you want to duplicate an mBlk without having to copy the referenced data. For example, mBlk 1 in Figure H-4 is a duplicate of mBlk A. Both are joined to the same clBlk. Thus, both share the same cluster. Please note that using a clBlk structure instead of a pointer to provide a level of indirection is not an extravagance. The clBlk structure tracks how many mBlks share its underlying cluster. This is critical when it comes time to free an mBlk/clBlk/cluster construct. If you use netMblkClFree( ) to free the construct, the mBlk is freed back to the pool and the reference count in the clBlk is decremented. If the reference count drops to zero, the clBlk and cluster are also freed back to the memory pool. Setting Up a Memory Pool Each END unit requires its own memory pool. How you configure a memory pool differs slightly depending on whether you intend the memory pool to be used by a network protocol, such as IPv4, or an END. As was mentioned above, all memory pools are organized around pools of mBlk structures, clBlk structures, and clusters. However, because a network protocol typically requires clusters of several different sizes, its memory pool must contain several cluster pools (one cluster pool for each cluster size). In addition, each 276
H Implementing a MUX-Based Network Interface Driver Figure H-3 Presentation of Two Packets to the TCP Layer mBlk mBlk mBlk null clBlk clBlk clBlk Cluster 64 bytes Cluster 512 bytes Cluster 2048 bytes Packet 1 mBlk mBlk null clBlk Cluster 64 bytes clBlk Cluster 2028 bytes Packet 2 Figure H-4 Two mBlks Can Share the Same Cluster H mBlk 1 mBlk 2 null mBlk A mBlk Bb null clBlk clBlk Cluster 64 bytes Cluster 2028 bytes 277
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VxWorks® 5.5 BSP DEVELOPER’S GUI
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1 Overview ........................
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Contents 1 Overview ...............
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Contents 3.6.5 Cache, MMU, and DMA
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Contents Memory-Mapped Chips ......
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Contents 7.3.3 System Configuration
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Contents 9.5.4 Processing .........
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Contents F Generic Drivers ........
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Contents Stopping the Driver Withou
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1 Overview 1.1 Introduction One str
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1 Overview ■ New Drivers Many new
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1 Overview Included with Tornado (n
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1 Overview ■ ■ ■ ■ ■ ■
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1 Overview Table 1-1 Font Usage for
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2 BSP Organization 2.1 Introduction
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2 BSP Organization Files in the tar
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2 BSP Organization Files in the tar
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2 BSP Organization Version 1.0 BSPs
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2 BSP Organization SM_MEM_SIZE The
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2 BSP Organization For boards witho
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2 BSP Organization PCI_MSTR_IO_LOCA
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2 BSP Organization The entry point
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2 BSP Organization target.nr The fi
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2 BSP Organization bootrom This fil
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2 BSP Organization sysSerialHwInit(
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2 BSP Organization The Motorola M68
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2 BSP Organization Many VxWorks fac
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2 BSP Organization further board in
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2 BSP Organization can have very un
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3 Creating a New BSP 3.1 Introducti
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3 Creating a New BSP 3.2 Setting Up
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3 Creating a New BSP Makefile At a
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3 Creating a New BSP char * sysBspR
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3 Creating a New BSP ... #endif } T
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3 Creating a New BSP int dummy; ...
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3 Creating a New BSP To find the so
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3 Creating a New BSP might want to
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3 Creating a New BSP not, use the s
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3 Creating a New BSP ■ It has a V
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3 Creating a New BSP 3.6.7 SCSI VxW
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4 Hardware Guidelines 4.1 Introduct
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4 Hardware Guidelines to the start
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4 Hardware Guidelines Higher-level
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4 Hardware Guidelines Such dedicate
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4 Hardware Guidelines Especially us
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4 Hardware Guidelines selected from
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4 Hardware Guidelines Hardware Inte
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4 Hardware Guidelines The rest of t
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4 Hardware Guidelines 4.4.2 System
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4 Hardware Guidelines only deal wit
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4 Hardware Guidelines 4.4.13 Parall
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4 Hardware Guidelines 0x10000, /* 6
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4 Hardware Guidelines The following
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5 Driver Guidelines 5.1 Introductio
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5 Driver Guidelines Maintenance and
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5 Driver Guidelines word addresses.
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5 Driver Guidelines 5.4 Design Guid
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5 Driver Guidelines Per-Device Data
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5 Driver Guidelines To fix this sit
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5 Driver Guidelines block are more
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5 Driver Guidelines 5.8 Driver Use
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5 Driver Guidelines ■ ■ Memory
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5 Driver Guidelines The level of ca
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5 Driver Guidelines cache for the d
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6 Components 6.1 Introduction Torna
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6 Components 6.2 Component Descript
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6 Components ■ User Presentation.
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6 Components Folder FOLDER_ANSI { N
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6 Components in a single project. I
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6 Components The component object i
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6 Components Parameters Parameters
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6 Components In the example, the co
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6 Components (2) comps/vxWorks/arch
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6 Components Figure 6-4 Include Com
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6 Components NOTE: INIT_BEFORE only
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6 Components The _CHILDREN property
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6 Components ! CAUTION: Do not alte
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6 Components ■ Check the Project
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7 Validation Testing 7.1 Introducti
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7 Validation Testing ■ ■ The te
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7 Validation Testing 2. The script
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7 Validation Testing Figure 7-4 Typ
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7 Validation Testing NOTE: Wind Riv
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7 Validation Testing scsi Requires
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7 Validation Testing Table 7-1 Vali
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7 Validation Testing Table 7-2 Vali
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7 Validation Testing sysProcNumGet
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7 Validation Testing The log file c
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8 Writing Portable C Code This chap
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8 Writing Portable C Code attribute
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8 Writing Portable C Code 8.1.3 Sta
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8 Writing Portable C Code 8.1.5 Oth
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8 Writing Portable C Code The last
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8 Writing Portable C Code Always sp
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8 Writing Portable C Code 8.2 Tool
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9 Documentation Guidelines 9.1 Intr
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9 Documentation Guidelines Table 9-
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9 Documentation Guidelines Table 9-
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9 Documentation Guidelines ■ Avoi
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9 Documentation Guidelines ■ ■
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9 Documentation Guidelines INCLUDE
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9 Documentation Guidelines INTRODUC
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9 Documentation Guidelines 9.5 Gene
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9 Documentation Guidelines uppercas
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9 Documentation Guidelines The foll
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10 Product Packaging 10.1 SETUP Dev
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10 Product Packaging ... include $(
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10 Product Packaging Vendor-Supplie
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10 Product Packaging in the project
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A Upgrading a BSP for Tornado 2.0 T
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A Upgrading a BSP for Tornado 2.0 A
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A Upgrading a BSP for Tornado 2.0
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A Upgrading a BSP for Tornado 2.0 6
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B Upgrading a BSP for Tornado 2.2 T
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B Upgrading a BSP for Tornado 2.2 C
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B Upgrading a BSP for Tornado 2.2
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B Upgrading a BSP for Tornado 2.2 c
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B Upgrading a BSP for Tornado 2.2
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C Upgrading a BSP for the VxWorks N
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D VxWorks Boot Sequence Table D-1 d
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Page 265 and 266: F Generic Drivers F.1 Introduction
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I Writing a SCSI-2 Device Driver A
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I Writing a SCSI-2 Device Driver */
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I Writing a SCSI-2 Device Driver *
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I Writing a SCSI-2 Device Driver ;/
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I Writing a SCSI-2 Device Driver I.
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I Writing a SCSI-2 Device Driver Fo
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J BSP Validation Test Suite Referen
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K BSP Validation Checklists This ap
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K BSP Validation Checklists BSP Val
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K BSP Validation Checklists 7. Veri
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K BSP Validation Checklists 2. If t
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K BSP Validation Checklists Validat
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K BSP Validation Checklists Manufac
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K BSP Validation Checklists Manufac
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L Refgen NOTE: In Tornado 1.0.1 and
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L Refgen * SYNOPSIS * \cs * void xx
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L Refgen Yields output approximatel
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L Refgen EXAMPLE INCLUDES SEE ALSO
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M BSP Product Contents When you are
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M BSP Product Contents Do not inclu
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Index A abort button 82 addressing
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Index clocks see also individual cl
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Index naming conventions 95 perform
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Index INCLUDE_USR_APPL 38 INCLUDE_V
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Index network drivers 58 network in
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Index scsiCtrlLib 324 scsiDirectLib
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Index testing, validation 139-158 s
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