Target-Mode Support

The interface between the SCSI device driver and the SCSI adapter device driver for target-mode support (that is, the attached device acts as an initiator) is accessed through calls to the SCSI adapter device driver open, close, and ioctl subroutines. Buffers that contain data received from an attached initiator device are passed from the SCSI adapter device driver to the SCSI device driver, and back again, in tm_buf structures.

Communication between the SCSI adapter device driver and the SCSI device driver for a particular data transfer is made by passing the tm_buf structures by pointer directly to routines whose entry points have been previously registered. This registration occurs as part of the sequence of commands the SCSI device driver executes using calls to the SCSI adapter device driver when the device driver opens a target-mode device instance.