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[SCSI] mptfusion: Added MPI_SCSIIO_CONTROL_HEADOFQ priority 

There is a 'ioprio' field in the BIO and the Request structure.
check this priority field and set MPI_SCSIIO_CONTROL_HEADOFQ
to pass down I/O priority.
An enhancement to the LSI Disk Array Controller firmware is being
developed to look at the Head Of Queue bit to allow I/Os with the HOQ bit
set to be processed before I/Os which do not have the HOQ bit set.
In order to set the HOQ bit, the mpt fusion driver  needs to look at the
'ioprio' field in the request structure associated with the scsi command.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Kashyap, Desai 2009-12-16 19:01:13 +05:30 committed by James Bottomley
parent 02507a80b3
commit 65f89c2396
1 changed files with 7 additions and 2 deletions
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9
drivers/message/fusion/mptscsih.c
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@ -1438,9 +1438,14 @@ mptscsih_qcmd(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
&& (vdevice->vtarget->tflags & MPT_TARGET_FLAGS_Q_YES)
&& (SCpnt->device->tagged_supported)) {
scsictl = scsidir | MPI_SCSIIO_CONTROL_SIMPLEQ;
} else {
if (SCpnt->request && SCpnt->request->ioprio) {
if (((SCpnt->request->ioprio & 0x7) == 1) ||
!(SCpnt->request->ioprio & 0x7))
scsictl |= MPI_SCSIIO_CONTROL_HEADOFQ;
}
} else
scsictl = scsidir | MPI_SCSIIO_CONTROL_UNTAGGED;
}
/* Use the above information to set up the message frame
*/