'\" te
.\"  Copyright (c) 2006, Sun Microsystems, Inc.,  All Rights Reserved
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.  See the License for the specific language governing permissions and limitations under the License.
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.TH SCSI_HBA_PKT_ALLOC 9F "Dec 11, 2006"
.SH NAME
scsi_hba_pkt_alloc, scsi_hba_pkt_free \- allocate and free a scsi_pkt structure
.SH SYNOPSIS
.nf
#include <sys/scsi/scsi.h>



\fBstruct scsi_pkt *\fR\fBscsi_hba_pkt_alloc\fR(\fBdev_info_t *\fR\fIdip\fR,
     \fBstruct scsi_address *\fR\fIap\fR, \fBint\fR \fIcmdlen\fR, \fBint\fR \fIstatuslen\fR,
     \fBint\fR \fItgtlen\fR, \fBint\fR \fIhbalen\fR,
     \fBint\fR (*\fIcallback\fR)(\fBcaddr_t\fR \fIarg\fR), \fBcaddr_t\fR \fIarg\fR);
.fi

.LP
.nf
\fBvoid\fR \fBscsi_hba_pkt_free\fR(\fBstruct scsi_address *\fR\fIap\fR, \fBstruct scsi_pkt *\fR\fIpkt\fR);
.fi

.SH INTERFACE LEVEL
illumos architecture specific (illumos DDI).
.SH PARAMETERS
.ne 2
.na
\fB\fIdip\fR\fR
.ad
.RS 13n
Pointer to a \fBdev_info_t\fR structure, defining the \fBHBA\fR driver
instance.
.RE

.sp
.ne 2
.na
\fB\fIap\fR\fR
.ad
.RS 13n
Pointer to a \fBscsi_address\fR(9S) structure, defining the target instance.
.RE

.sp
.ne 2
.na
\fB\fIcmdlen\fR\fR
.ad
.RS 13n
Length in bytes to be allocated for the \fBSCSI\fR command descriptor block
(\fBCDB\fR).
.RE

.sp
.ne 2
.na
\fB\fIstatuslen\fR\fR
.ad
.RS 13n
Length in bytes to be allocated for the \fBSCSI\fR status completion block
(\fBSCB\fR).
.RE

.sp
.ne 2
.na
\fB\fItgtlen\fR\fR
.ad
.RS 13n
Length in bytes to be allocated for a private data area for the target driver's
exclusive use.
.RE

.sp
.ne 2
.na
\fB\fIhbalen\fR\fR
.ad
.RS 13n
Length in bytes to be allocated for a private data area for the \fBHBA\fR
driver's exclusive use.
.RE

.sp
.ne 2
.na
\fB\fIcallback\fR\fR
.ad
.RS 13n
Indicates what \fBscsi_hba_pkt_alloc()\fR should do when resources are not
available:
.sp
.ne 2
.na
\fB\fBNULL_FUNC\fR\fR
.ad
.RS 14n
Do not wait for resources.  Return a \fINULL\fR pointer.
.RE

.sp
.ne 2
.na
\fB\fBSLEEP_FUNC\fR\fR
.ad
.RS 14n
Wait indefinitely for resources.
.RE

.RE

.sp
.ne 2
.na
\fB\fIarg\fR\fR
.ad
.RS 13n
Must be \fINULL.\fR
.RE

.sp
.ne 2
.na
\fB\fIpkt\fR\fR
.ad
.RS 13n
A pointer to a \fBscsi_pkt\fR(9S) structure.
.RE

.SH DESCRIPTION
For \fBscsi_hba_pkt_alloc()\fR:
.sp
.LP
The \fBscsi_hba_pkt_alloc()\fR function allocates space for a \fBscsi_pkt\fR
structure. \fBHBA\fR drivers must use this interface when allocating a
\fBscsi_pkt\fR from their \fBtran_init_pkt\fR(9E) entry point.
.sp
.LP
If \fIcallback\fR is \fBNULL_FUNC\fR, \fBscsi_hba_pkt_alloc()\fR may not sleep
when allocating resources, and callers should be prepared to deal with
allocation failures.
.sp
.LP
The \fBscsi_hba_pkt_alloc()\fR function copies the \fBscsi_address\fR(9S)
structure pointed to by \fIap\fR to the \fBpkt_address\fR field in the
\fBscsi_pkt\fR(9S).
.sp
.LP
The \fBscsi_hba_pkt_alloc()\fR function also allocates memory for these
\fBscsi_pkt\fR(9S) data areas, and sets these fields to point to the allocated
memory:
.sp
.ne 2
.na
\fB\fBpkt_ha_private\fR\fR
.ad
.RS 18n
\fBHBA\fR private data area.
.RE

.sp
.ne 2
.na
\fB\fBpkt_private\fR\fR
.ad
.RS 18n
Target driver private data area.
.RE

.sp
.ne 2
.na
\fB\fBpkt_scbp\fR\fR
.ad
.RS 18n
\fBSCSI\fR status completion block.
.RE

.sp
.ne 2
.na
\fB\fBpkt_cdbp\fR\fR
.ad
.RS 18n
\fBSCSI\fR command descriptor block.
.RE

.sp
.LP
For \fBscsi_hba_pkt_free()\fR:
.sp
.LP
The \fBscsi_hba_pkt_free()\fR function frees the space allocated for the
\fBscsi_pkt\fR(9S) structure.
.SH RETURN VALUES
The \fBscsi_hba_pkt_alloc()\fR function returns a pointer to the \fBscsi_pkt\fR
structure, or \fINULL\fR if no space is available.
.SH CONTEXT
The \fBscsi_hba_pkt_alloc()\fR function can be called from user, interrupt, or
kernel context. Drivers must not allow \fBscsi_hba_pkt_alloc()\fR to sleep if
called from an interrupt routine.
.sp
.LP
The \fBscsi_hba_pkt_free()\fR function can be called from user, interrupt, or
kernel context.
.SH SEE ALSO
\fBtran_init_pkt\fR(9E), \fBscsi_address\fR(9S), \fBscsi_pkt\fR(9S)
.sp
.LP
\fIWriting Device Drivers\fR