TRAN_RESET(9E)TRAN_RESET(9E)NAMEtran_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 ini‐
tialized 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_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.
RETURN VALUEStran_reset() should return:
1
on success.
0
on failure.
CONTEXT
The tran_reset() function can be called from user or interrupt context.
This requirement comes from scsi_reset().
SEE ALSOattach(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.
Aug 17, 2005 TRAN_RESET(9E)
