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

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

#include <sys/scsi/scsi.h>
int scsi_transport(struct scsi_pkt *pkt);

illumos DDI specific (illumos DDI).

pkt
Pointer to a scsi_pkt(9S) structure.

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.

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.

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

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);
}

tran_start(9E), makecom(9F), scsi_init_pkt(9F), scsi_pktalloc(9F), scsi_poll(9F), scsi_pkt(9S)

Writing Device Drivers

January 16, 2006 OmniOS