From 65f89c2396aa113a06fe7e2f6ba46f0712cb4806 Mon Sep 17 00:00:00 2001 From: "Kashyap, Desai" Date: Wed, 16 Dec 2009 19:01:13 +0530 Subject: [PATCH] [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 Signed-off-by: James Bottomley --- drivers/message/fusion/mptscsih.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c index 5775275..8128d309 100644 --- a/drivers/message/fusion/mptscsih.c +++ b/drivers/message/fusion/mptscsih.c @@ -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 */ -- 2.7.4