tran_reset(9E)							Driver Entry Points						    tran_reset(9E)

NAME

       tran_reset - reset a SCSI bus or target

SYNOPSIS

       #include <sys/scsi/scsi.h>

	int prefixtran_reset(struct scsi_address *ap, int level);

INTERFACE LEVEL

       Solaris architecture specific (Solaris DDI).

PARAMETERS

       ap	       Pointer to the scsi_address(9S) structure.

       level	       The level of reset required.

DESCRIPTION

       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_ALL	       Reset the SCSI bus.

       RESET_TARGET	       Reset the target specified by ap.

       RESET_LUN	       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_statis-
       tics 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_setcap(9E) routine.

RETURN VALUES

       tran_reset() should return:

       1	on success.

       0	on failure.

SEE ALSO

       attach(9E), ddi_dma_buf_setup(9F), scsi_hba_attach(9F), scsi_reset(9F), scsi_address(9S), scsi_hba_tran(9S)

       Writing Device Drivers

NOTES

       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.

SunOS 5.10							    12 Jul 2002 						    tran_reset(9E)