mptfusion: Added MPI_SCSIIO_CONTROL_HEADOFQ priority

PATCH New Kashyap, Desai 1 participant 1 message Dec 16, 2009

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SCSI LSI Logic MPT fusion drivers (FC/SAS/SPI)

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Kashyap, Desai

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2009-12-16 13:58 UTC #0 lore raw

PATCH 1/5 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 <[email protected]>

---

drivers/message/fusion/mptscsih.c +7 -2

index 5775275..8128d30 100644
@@ -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
 	 */