#SD HOST ADAPTER DRIVER DRIVERS#
#SD HOST ADAPTER DRIVER DRIVER#
#SD HOST ADAPTER DRIVER SOFTWARE#

Target driver calling scsi_destroy_pkt(9F) See SCSA HBA Entry Points for more information. These entry points are called by the system when configuring a target driver instance connected to the HBA driver, or when the target driver makes a SCSA request. SCSA defines a number of HBA driver entry points, listed in the following table. SCSA HBA interfaces include HBA entry points, HBA data structures, and an HBA framework. The following figure also shows typical transport entry points and function calls.

#SD HOST ADAPTER DRIVER DRIVERS#

When a command has been completed, the HBA driver calls the target driver's SCSI pkt command completion routine.ДЇigure 15вЂ“2 illustrates this flow, with emphasis placed on the transfer of information from target drivers to SCSA to HBA drivers. The host adapter driver also manages the host adapter hardware and the SCSI protocols necessary to perform the commands.

The HBA driver provides resource allocation, DMA management, and transport services in response to requests made by SCSI target drivers through SCSA.

#SD HOST ADAPTER DRIVER SOFTWARE#

The HBA transport layer is a software and hardware layer responsible for transporting a SCSI command to a SCSI target device. SCSA manages the connections between the target and HBA drivers through an HBA transport layer, as shown in the following figure. To and data to and from the SCSI bus (by the HBA driver) for the appropriate target device. SCSA conceptually separates the building of a SCSI command (by the target driver) from the transporting of the command SCSA is the Solaris 9 DDI/DKI programming interface for the transmission of SCSI commands from a target driver to a host adapter driver.Д«y conforming to the SCSA, the target driver can pass any combination of SCSI commands and sequences to a target device without knowledge of the hardware implementation of the host adapter. Informing the target driver of command completion (or failure)

Performing any data transfers that the command requires Transporting the commands to the specified SCSI target device The host bus adapter driver is responsible for:ДЄccepting SCSI commands from the SCSI target driver Target driver developers can also benefit from reading this chapter.

For information on SCSI target drivers, see ChapterВ 14, SCSI Target Drivers. Understanding SCSI target drivers is an essential prerequisite to writing effective SCSI HBA drivers. The Sun Common SCSI Architecture (SCSA) defines the interface between these target and HBA components. An instance of the HBA driver controls each of its host bus adapter devices configured in the system. Host bus adapter driver refers to a software component installed as a device driver, such as the espДriver on a SPARC machine or the ncrs driver on an IA machine, and the isp driver, which works on both. Host bus adapter device refers to HBA hardware, such as an SBus or PCI SCSI adapter card. Each target device on a SCSI bus is controlled by one instance Target driver refers to a software component installed as a device driver. Target device refers to a device on a SCSI bus, such as a disk or a tape drive. HBA Driver Dependency and Configuration IssuesДЄs described in ChapterВ 14, SCSI Target Drivers, the Solaris 9 DDI/DKI divides the software interface to SCSI devices into two major parts: This chapter contains information on creating SCSI host bus adapter (HBA) drivers and provides sample code illustrating the structure of a typical HBA driver and showing the use of the HBA driver interfaces provided by the Sun Common SCSI Architecture (SCSA).

Sd host adapter driver