SCSI_ADDRESS_DEVICE(9F) Kernel Functions for Drivers SCSI_ADDRESS_DEVICE(9F)

scsi_address_device, scsi_device_unit_address, scsi_device_hba_private_get, scsi_device_hba_private_set
SCSI Complex addressing utility functions

#include <sys/scsi/scsi.h>

struct scsi_device *
scsi_address_device(struct scsi_address *sa);

void *
scsi_device_hba_private_get(struct scsi_device *sd);

void
scsi_device_hba_private_set(struct scsi_device *sd, void *data);

char *
scsi_device_unit_address(struct scsi_device *sd);

Evolving - This interface is still evolving in illumos. API and ABI stability is not guaranteed.

sa
Pointer to a scsi_address(9S) structure.
sd
Pointer to a scsi_device(9S) structure.
data
A private value that the driver can get and set.

These functions provide useful services for SCSI HBA drivers that use complex addressing. In complex addressing mode, the scsi_address(9S) structure is treated as an opaque structure and is not a simple target and LUN. To use these functions, the driver must have enabled complex addressing by passing the SCSI_HBA_ADDR_COMPLEX flag into the hba_flags argument of the scsi_hba_attach_setup(9F) function. If the SCSI_HBA_ADDR_COMPLEX flag was not passed, then the driver must not call the scsi_device_hba_private_get(), scsi_device_hba_private_set(), or scsi_device_unit_address() functions.

The scsi_address_device() function maps the scsi_address(9S) function back to its corresponding scsi_device(9S) structure. If the SCSI_HBA_ADDR_COMPLEX flag has not been set, then the function will return NULL. This can be used as a way to check if the flag has been set on the device.

The scsi_device_hba_private_set() function, allows a driver to set a private data value on the scsi_device(9S) structure, which it can later retrieve through the scsi_device_hba_private_get() function. Most drivers will set a value during the tran_start(9E) entry point and then reference the data structure later on. This is designed to simplify the management of mapping between driver data structures and the corresponding system objects.

The scsi_device_unit_address() function returns the unit address of the scsi_device(9S) structure. The returned string should not be modified by the device driver. The unit address string comes from values that are passed when the device is enumerated, generally through an instance of an iport(9).

These functions may be used in user, kernel, and interrupt context.

Upon successful completion, the scsi_address_device() function returns a pointer to the scsi_device(9S) structure. Otherwise, if an error occurred NULL is returned.

The scsi_device_hba_private_get() function returns a data value registered via the scsi_device_hba_private_set() function. If the scsi_device_hba_private_set() was never called, NULL is returned.

Upon successful completion, the scsi_device_unit_address() returns a pointer to a character string with the device's unit address. Otherwise, NULL is returned.

If the SCSI_HBA_ADDR_COMPLEX flag has not been set for the HBA structure or iport, then the scsi_address_device(), scsi_device_hba_private_get(), and scsi_device_unit_address() functions return NULL.

iport(9), tran_start(9E), scsi_hba_attach_setup(9F), scsi_address(9S), scsi_device(9S)
April 20, 2017 OmniOS