SCSI_ARQ_STATUS(9S) Data Structures for Drivers SCSI_ARQ_STATUS(9S)

NAME

scsi_arq_status - SCSI auto request sense structure

SYNOPSIS

#include <sys/scsi/scsi.h>

INTERFACE LEVEL

illumos DDI specific (illumos DDI)

DESCRIPTION

When auto request sense has been enabled using scsi_ifsetcap(9F) and the
"auto-rqsense" capability, the target driver must allocate a status area
in the SCSI packet structure for the auto request sense structure (see
scsi_pkt(9S)). In the event of a check condition, the transport layer
automatically executes a request sense command. This check ensures that
the request sense information does not get lost. The auto request sense
structure supplies the SCSI status of the original command, the transport
information pertaining to the request sense command, and the request
sense data.

STRUCTURE MEMBERS

struct scsi_status sts_status; /* SCSI status */
struct scsi_status sts_rqpkt_status; /* SCSI status of
request sense cmd */
uchar_t sts_rqpkt_reason; /* reason completion */
uchar_t sts_rqpkt_resid; /* residue */
uint_t sts_rqpkt_state; /* state of command */
uint_t sts_rqpkt_statistics;/* statistics */
struct scsi_extended_sense sts_sensedata; /* actual sense data */


sts_status is the SCSI status of the original command. If the status
indicates a check condition, the transport layer might have performed an
auto request sense command.


sts_rqpkt_status is the SCSI status of the request sense command.
sts_rqpkt_reason is the completion reason of the request sense command.
If the reason is not CMD_CMPLT, then the request sense command did not
complete normally.


sts_rqpkt_resid is the residual count of the data transfer and indicates
the number of data bytes that have not been transferred. The auto request
sense command requests SENSE_LENGTH bytes.


sts_rqpkt_state has bit positions representing the five most important
statuses that a SCSI command can go obtain.


sts_rqpkt_statistics maintains transport-related statistics of the
request sense command.


sts_sensedata contains the actual sense data if the request sense command
completed normally.

SEE ALSO

scsi_ifgetcap(9F), scsi_init_pkt(9F), scsi_extended_sense(9S),
scsi_pkt(9S)


Writing Device Drivers

September 30, 1996 SCSI_ARQ_STATUS(9S)