NAME

tran_getcap, tran_setcap - get/set SCSI transport capability

SYNOPSIS

#include <sys/scsi/scsi.h>

int prefixtran_getcap(struct scsi_address * ap,char * cap,int whom);
int prefixtran_setcap(struct scsi_address * ap,char * cap,int value, int whom);

INTERFACE LEVEL

Solaris architecture specific (Solaris DDI).

ARGUMENTS

ap

Pointer to the scsi_address(9S) structure.

cap

Pointer to the string capability identifier.

value

Defines the new state of the capability.

whom

Specifies whether all targets or only the specified target is affected.

DESCRIPTION

The tran_getcap( ) and tran_setcap( ) vectors in the scsi_hba_tran(9S) structure must be initialized during the HBA driver's attach(9E) to point to HBA entry points to be called when a target driver calls scsi_ifgetcap(9F) and scsi_ifsetcap(9F).

tran_getcap( ) is called to get the current value of a capability specific to features provided by the HBA hardware or driver. The name of the capability cap is the NULL terminated capability string.

If whom is non-zero, the request is for the current value of the capability defined for the target specified by the scsi_address(9S) structure pointed to by ap; if whom is 0 all targets are affected, else the target specified by the scsi_address structure pointed to by ap is affected.

tran_setcap( ) is called to set the value of the capability cap to the value of value. If whom is non-zero, the capability should be set for the target specified by the scsi_address(9S) structure pointed to by ap; if whom is 0 all targets are affected, else the target specified by the scsi_address structure pointed to by ap is affected.

A device may support only a subset of the defined capabilities.

Refer to scsi_ifgetcap(9F) for the list of defined capabilities.

HBA drivers should use scsi_hba_lookup_capstr(9F) to match cap against the canonical capability strings.

RETURN VALUES

tran_setcap( ) must return 1 if the capability was successfully set to the new value, 0 if the HBA driver does not support changing the capability, and -1 if the capability was not defined.

tran_getcap( ) must return the current value of a capability or -1 if the capability was not defined.

SEE ALSO

attach(9E), scsi_hba_attach(9F), scsi_hba_lookup_capstr(9F), scsi_ifgetcap(9F), scsi_address(9S), scsi_hba_tran(9S)

Writing Device Drivers