scsi_address(9S)
NAME
scsi_address - SCSI address structure
SYNOPSIS
#include <sys/scsi/scsi.h>
INTERFACE LEVEL
Solaris architecture specific (Solaris DDI)
DESCRIPTION
A scsi_address structure defines the addressing components
for a SCSI target device. The address of the target device
is separated into two components: target number and logical
unit number. The two addressing components are used to
uniquely identify any type of SCSI device; however, most
devices can be addressed with the target component of the
address.
In the case where only the target component is used to
address the device, the logical unit should be set to 0. If
the SCSI target device supports logical units, then the HBA
must interpret the logical units field of the data struc-
ture.
The pkt_address member of a scsi_pkt(9S) is initialized by
scsi_init_pkt(9F).
STRUCTURE MEMBERS
scsi_hba_tran_t *a_hba_tran; /* Transport vectors for the SCSI bus */
ushort_t a_target; /* SCSI target id */
uchar_t a_lun; /* SCSI logical unit */
a_hba_tran is a pointer to the controlling HBA's transport
vector structure. The SCSA interface uses this field to pass
any transport requests from the SCSI target device drivers
to the HBA driver.
a_target is the target component of the SCSI address.
a_lun is the logical unit component of the SCSI address. The
logical unit is used to further distinguish a SCSI target
device that supports multiple logical units from one that
does not. The makecom(9F) family of functions use the a_lun
field to set the logical unit field in the SCSI CDB, for
compatibility with SCSI-1.
SEE ALSO
makecom(9F), scsi_init_pkt(9F), scsi_hba_tran(9S),
scsi_pkt(9S)
Writing Device Drivers
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