scsi_status(9S)

NAME

scsi_status − SCSI status structure

SYNOPSIS

#include <sys/scsi/scsi.h>

INTERFACE LEVEL

Solaris DDI specific (Solaris DDI)

DESCRIPTION

The SCSI-2 standard defines a status byte which is normally sent by the target to the initiator during the status phase at the completion of each command.

STRUCTURE MEMBERS

uchar	sts_scsi2	: 1;	/∗ SCSI-2 modifier bit ∗/
uchar	sts_is	: 1;	/∗ intermediate status sent ∗/
uchar	sts_busy	: 1;	/∗ device busy or reserved ∗/
uchar	sts_cm	: 1;	/∗ condition met ∗/
uchar	sts_chk	: 1;	/∗ check condition ∗/

sts_chk indicates that a contingent allegiance condition has occurred.

sts_cm is returned whenever the requested operation is satisfied

sts_busy indicates that the target is busy. This status is returned whenever a target is unable to accept a command from an otherwise acceptable initiator (that is, no reservation conflicts). The recommended initiator recovery action is to issue the command again at a later time.

sts_is is returned for every successfully completed command in a series of linked commands (except the last command), unless the command is terminated with a check condition status, reservation conflict, or command terminated status. Note that host bus adapter drivers may not support linked commands (see scsi_ifsetcap(9F)). If sts_is and sts_busy are both set, then a reservation conflict has occurred.

sts_scsi2 is the SCSI-2 modifier bit. If sts_scsi2 and sts_chk are both set, this indicates a command terminated status. If sts_scsi2 and sts_busy are both set, this indicates that the command queue in the target is full.

For accessing the status as a byte, the following values are appropriate:

STATUS_GOOD This status indicates that the target has successfully completed the command.

STATUS_CHECK This status indicates that a contingent allegiance condition has occurred.

STATUS_MET This status is returned when the requested operations are satisfied.

STATUS_BUSY This status indicates that the target is busy.

STATUS_INTERMEDIATE
This status is returned for every successfully completed command in a series of linked commands.

STATUS_SCSI2 This is the SCSI-2 modifier bit.

STATUS_INTERMEDIATE_MET
This status is a combination of STATUS_MET and STATUS_INTERMEDIATE.

STATUS_RESERVATION_CONFLICT
This status is a combination of STATUS_INTERMEDIATE and STATUS_BUSY, and is returned whenever an initiator attempts to access a logical unit or an extent within a logical unit is reserved.

STATUS_TERMINATED
This status is a combination of STATUS_SCSI2 and STATUS_CHECK, and is returned whenever the target terminates the current I/O process after receiving a terminate I/O process message.

STATUS_QFULL This status is a combination of STATUS_SCSI2 and STATUS_BUSY, and is returned when the command queue in the target is full.

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