BSP Developer's Guide

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VxWorks 5.5 <strong>BSP</strong> Developer’s <strong>Guide</strong> cluster size must be a power of two. Common cluster sizes for this style of memory pool are 64, 128, 256, 512, 1024 and 2048 bytes. See Figure H-5. Figure H-5 A Protocol Memory Pool Memory Pool for a Protocol Stack Pool of mBlks mBlk mBlk mBlk mBlk mBlk mBlk mBlk mBlk mBlk mBlk mBlk ... Pool of Clusters 64 64 64 64 64 64 64 64 64 64 64 ... Pool of clBlks clBlk clBlk clBlk clBlk clBlk clBlk clBlk clBlk clBlk clBlk clBlk ... Pool of Clusters 128 128 128 128 128 128 128 128 128 128 128 ... Pool of Clusters ... By contrast, a memory pool intended for an END typically contains only one cluster pool (in addition to the mBlk pools and clBlk pools), and the cluster size is not limited to a power of two. Thus, you are free to choose whatever cluster size is most convenient, which is typically something close to the MTU of the network. For example, in the Lance Ethernet END, the cluster size is 1520 bytes, which is the Ethernet MTU plus some slack. See Figure H-6. NOTE: It is recommended that there be at least a 3:1 ratio of mBlks to clusters. Figure H-6 An END Memory Pool Memory Pool for an END Pool of mBlks mBlk mBlk mBlk mBlk mBlk mBlk mBlk mBlk mBlk mBlk mBlk ... Pool of clBlks clBlk clBlk clBlk clBlk clBlk clBlk clBlk clBlk clBlk clBlk clBlk ... Pool of Clusters 1520 1520 1520 1520 1520 1520 1520 1520 1520 1520 1520 ... 278
H Implementing a MUX-Based Network Interface Driver To establish a memory pool, call netPoolInit( ). For an END, make the netPoolInit( ) call during the driver’s initialization phase. From out of this pool, your driver should reserve the mBlk/clBlk/cluster constructs it needs to receive a packet. For more information, see the reference entry for netBufLib. Receiving Data into Clusters During the initialization phase of your END, call netClusterGet( ) to reserve some reasonable number of clusters to receive incoming packets (store references to these reserved clusters in a buffer ring or some other structure appropriate to your needs). When a packet arrives, your END should receive it directly into one of these clusters. When your END is ready to pass a received packet up to the MUX, it does so using an mBlk/clBlk/cluster construct. To create this construct: 1. Call netClBlkGet( ) to reserve a clBlk structure. 2. Call netClBlkJoin( ) to join the clBlk to the cluster containing the packet. 3. Call netMblkGet( ) to reserve a mBlk structure. 4. Call netMblkClJoin( ) to join the mBlk structure to the clBlk/cluster construct. Now that the packet is contained within an mBlk/clBlk/cluster construct, the END can use various netBufLib routines to adjust or inspect the data in the mBlk/clBlk/cluster construct. For example, to read the packet data in the construct, your END can call netMblkToBufCopy( ). In addition, your END can use the mBlk chaining feature to prepend or append data to the packet. H NOTE: The various net*Get( ) routines reserve memory from a pre-allocated pool. Internally, they do not use semaphores. Thus, they are safe to call from places where a call to malloc( ) would be impossible. Freeing mBlks, clBlks, and Clusters When you are done with an mBlk/clBlk/cluster chain and want to return it to the memory pool, call netMblkClChainFree( ). This frees all mBlks in the chain. It also decrements the reference counters in all the clBlks in the chain. If the reference counter for a clBlk drops to zero, that clBlk and its associated cluster are also freed back to the pool. To free a single mBlk/clBlk/cluster back to the memory pool, use netMblkClFree( ). For more information on these and other free routines, see the reference entry for netBufLib. 279
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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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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 int dummy; ...
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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 Higher-level
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4 Hardware Guidelines 4.4.2 System
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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 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 scsi Requires
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7 Validation Testing Table 7-1 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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9 Documentation Guidelines 9.1 Intr
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9 Documentation Guidelines Table 9-
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9 Documentation Guidelines INCLUDE
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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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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 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 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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D VxWorks Boot Sequence Table D-1 V
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Page 265 and 266: F Generic Drivers F.1 Introduction
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J BSP Validation Test Suite Referen
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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 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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