illumos: manual page: scsi

SCSI_TRANSPORT(9F) Kernel Functions for Drivers SCSI_TRANSPORT(9F)

NAME

scsi_transport - request by a SCSI target driver to start a command

SYNOPSIS

#include <sys/scsi/scsi.h>

int scsi_transport(struct scsi_pkt *pkt);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

pkt
Pointer to a scsi_pkt(9S) structure.

DESCRIPTION

Target drivers use scsi_transport() to request the host adapter driver to
transport a command to the SCSI target device specified by pkt. The
target driver must obtain resources for the packet using
scsi_init_pkt(9F) prior to calling this function. The packet may be
initialized using one of the makecom(9F) functions. scsi_transport()
does not wait for the SCSI command to complete. See scsi_poll(9F) for a
description of polled SCSI commands. Upon completion of the SCSI command
the host adapter calls the completion routine provided by the target
driver in the pkt_comp member of the scsi_pkt pointed to by pkt.

RETURN VALUES

The scsi_transport() function returns:

TRAN_ACCEPT
The packet was accepted by the transport layer.

TRAN_BUSY
The packet could not be accepted because there was
already a packet in progress for this target/lun, the
host adapter queue was full, or the target device
queue was full.

TRAN_BADPKT
The DMA count in the packet exceeded the DMA engine's
maximum DMA size.

TRAN_FATAL_ERROR
A fatal error has occurred in the transport layer.

CONTEXT

The scsi_transport() function can be called from user, interrupt, or
kernel context.

EXAMPLES

Example 1: Using scsi_transport()

if ((status = scsi_transport(rqpkt)) != TRAN_ACCEPT) {
scsi_log(devp, sd_label, CE_WARN,
"transport of request sense pkt fails (0x%x)\n", status);
}