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Solaris DDI specific (Solaris DDI)
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 (see scsi_pkt(9S) ) for the auto request sense structure. In the event of a check condition the transport layer will automatically execute a request sense command. This 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.
| struct scsi_status | sts_status; | /* SCSI status */ |
| struct scsi_status | sts_rqpkt_status; | /* SCSI status of |
| request sense cmd */ | ||
| u_char | sts_rqpkt_reason; | /* reason completion */ |
| u_char | sts_rqpkt_resid; | /* residue */ |
| u_long | sts_rqpkt_state; | /* state of command */ |
| u_long | 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 then the transport layer may 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 status that a SCSI command can go through.
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.