tran_reset - reset a SCSI bus or target
#include <sys/scsi/scsi.h> int prefixtran_reset(struct scsi_address *ap, int level);
Solaris architecture specific (Solaris DDI).
Pointer to the scsi_address(9S) structure.
The level of reset required.
The tran_reset() vector in the scsi_hba_tran(9S) structure must be initialized during the HBA driver's attach(9E) to point to an HBA entry point to be called when a target driver calls scsi_reset(9F).
tran_reset() must reset either the SCSI bus, a SCSI target device, or a SCSI logical unit as specified by level.
level must be one of the following:
Reset the SCSI bus.
Reset the target specified by ap.
Reset the logical unit specified by ap.
tran_reset should set the pkt_reason field of all outstanding packets in the transport layer associated with each target or logical unit that was successfully reset to CMD_RESET and the pkt_statistics field must be OR'ed with either STAT_BUS_RESET (if the SCSI bus was reset) or STAT_DEV_RESET (if the target or logical unit was reset).
The HBA driver should use a SCSI Bus Device Reset Message to reset a target device. The HBA driver should use a SCSI Logical Unit Reset Message to reset a logical unit.
Packets that are in the transport layer but not yet active on the bus should be returned with pkt_reason set to CMD_RESET and pkt_statistics OR'ed with STAT_ABORTED.
Support for RESET_LUN is optional but strongly encouraged for new and updated HBA drivers. If an HBA driver provides RESET_LUN support, it must also create the lun-reset capability with a value of zero for each target device instance represented by a valid ap. The HBA is also required to provide the means to return the current value of the lun-reset capability in its tran_getcap(9E) routine, as well as the means to change the value of the lun_reset capability in its tran_getcap(9E) routine.
tran_reset() should return:
The tran_reset() function can be called from user or interrupt context. This requirement comes from scsi_reset().
If pkt_reason already indicates that an earlier error had occurred for a particular pkt, tran_reset() should not overwrite pkt_reason with CMD_RESET.