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'\" te .\" Copyright (c) 2006, 2020, Oracle and/or its affiliates. .TH get_pktiopb 9F "16 Jan 2006" "Oracle Solaris 11.4" "Kernel Functions" .SH NAME get_pktiopb, free_pktiopb \- allocate/free a SCSI packet in the iopb map .SH SYNOPSIS .LP .nf #include <sys/scsi/scsi.h> \fBstruct scsi_pkt *\fR\fBget_pktiopb\fR(\fBstruct scsi_address *\fR\fIap\fR, \fBcaddr_t *\fR\fIdatap\fR, \fBint\fR \fIcdblen\fR, \fBint\fR \fIstatuslen\fR, \fBint\fR \fIdatalen\fR, \fBint\fR \fIreadflag\fR, \fBint (*\fR\fIcallback\fR); .fi .LP .nf \fBvoid\fR \fBfree_pktiopb\fR(\fBstruct scsi_pkt *\fR\fIpkt\fR, \fBcaddr_t\fR \fIdatap\fR, \fBint\fR \fIdatalen\fR); .fi .SH INTERFACE LEVEL .sp .LP These interfaces are obsolete. Use \fBscsi_alloc_consistent_buf\fR(9F) instead of \fBget_pktiopb()\fR. Use \fBscsi_free_consistent_buf\fR(9F) instead of \fBfree_pktiopb()\fR. .SH PARAMETERS .sp .ne 2 .mk .na \fB\fIap\fR\fR .ad .RS 13n .rt Pointer to the target's \fBscsi_address\fR structure. .RE .sp .ne 2 .mk .na \fB\fIdatap\fR\fR .ad .RS 13n .rt Pointer to the address of the packet, set by this function. .RE .sp .ne 2 .mk .na \fB\fIcdblen\fR\fR .ad .RS 13n .rt Number of bytes required for the \fBSCSI \fRcommand descriptor block (CDB). .RE .sp .ne 2 .mk .na \fB\fIstatuslen\fR\fR .ad .RS 13n .rt Number of bytes required for the \fBSCSI \fRstatus area. .RE .sp .ne 2 .mk .na \fB\fIdatalen\fR\fR .ad .RS 13n .rt Number of bytes required for the data area of the \fBSCSI \fRcommand. .RE .sp .ne 2 .mk .na \fB\fIreadflag\fR\fR .ad .RS 13n .rt If non-zero, data will be transferred from the \fBSCSI \fRtarget. .RE .sp .ne 2 .mk .na \fB\fIcallback\fR\fR .ad .RS 13n .rt Pointer to a callback function, or \fBNULL_FUNC\fR or \fBSLEEP_FUNC\fR .RE .sp .ne 2 .mk .na \fB\fIpkt\fR\fR .ad .RS 13n .rt Pointer to a \fBscsi_pkt\fR(9S) structure. .RE .SH DESCRIPTION .sp .LP The \fBget_pktiopb()\fR function allocates a \fBscsi_pkt\fR structure that has a small data area allocated. It is used by some \fBSCSI \fRcommands such as \fBREQUEST_SENSE\fR, which involve a small amount of data and require cache-consistent memory for proper operation. It uses \fBddi_iopb_alloc\fR(9F) for allocating the data area and \fBscsi_resalloc\fR(9F) to allocate the packet and \fBDMA\fR resources. .sp .LP \fIcallback\fR indicates what \fBget_pktiopb()\fR should do when resources are not available: .sp .ne 2 .mk .na \fB\fBNULL_FUNC\fR\fR .ad .RS 16n .rt Do not wait for resources. Return a \fINULL\fR pointer. .RE .sp .ne 2 .mk .na \fB\fBSLEEP_FUNC\fR\fR .ad .RS 16n .rt Wait indefinitely for resources. .RE .sp .ne 2 .mk .na \fBOther Values\fR .ad .RS 16n .rt \fIcallback\fR points to a function which is called when resources may have become available. \fIcallback\fR \fBmust\fR return either \fB0\fR (indicating that it attempted to allocate resources but failed to do so again), in which case it is put back on a list to be called again later, or \fB1\fR indicating either success in allocating resources or indicating that it no longer cares for a retry. .RE .sp .LP The \fBfree_pktiopb()\fR function is used for freeing the packet and its associated resources. .SH RETURN VALUES .sp .LP The \fBget_pktiopb()\fR function returns a pointer to the newly allocated \fBscsi_pkt\fR or a \fINULL\fR pointer. .SH CONTEXT .sp .LP If \fIcallback\fR is \fBSLEEP_FUNC\fR, then this routine can be called only from user or kernel context. Otherwise, it can be called from user, interrupt, or kernel context. The \fIcallback\fR function should not block or call routines that block. .sp .LP The \fBfree_pktiopb()\fR function can be called from user, interrupt, or kernel context. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for a description of the following attributes: .sp .TS tab( ) box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Stability Level Obsolete .TE .sp .SH SEE ALSO .sp .LP \fBattributes\fR(7), \fBddi_iopb_alloc\fR(9F), \fBscsi_alloc_consistent_buf\fR(9F), \fBscsi_free_consistent_buf\fR(9F), \fBscsi_pktalloc\fR(9F), \fBscsi_resalloc\fR(9F), \fBscsi_pkt\fR(9S) .sp .LP \fIWriting Device Drivers in Oracle Solaris 11.4\fR .SH NOTES .sp .LP The \fBget_pktiopb()\fR and \fBfree_pktiopb()\fR functions are obsolete and will be discontinued in a future release. These functions have been replaced by, respectively, \fBscsi_alloc_consistent_buf\fR(9F) and \fBscsi_free_consistent_buf\fR(9F). .sp .LP The \fBget_pktiopb()\fR function uses scarce resources. For this reason and its obsolescence (see above), its use is discouraged.