From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kashyap, Desai" Subject: [PATCH 1/5] mptfusion: Added MPI_SCSIIO_CONTROL_HEADOFQ priority Date: Wed, 16 Dec 2009 19:01:13 +0530 Message-ID: <20091216133105.GN31161@lsi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from na3sys009aog105.obsmtp.com ([74.125.149.75]:32797 "HELO na3sys009aog105.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S933059AbZLPN6f (ORCPT ); Wed, 16 Dec 2009 08:58:35 -0500 Content-Disposition: inline Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Cc: James.Bottomley@HansenPartnership.com, Eric.Moore@lsi.com, Sathya.Prakash@lsi.com 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 --- --- diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c index 5775275..8128d30 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 */