From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:59066 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753221AbdCHNOu (ORCPT ); Wed, 8 Mar 2017 08:14:50 -0500 Subject: Patch "scsi: storvsc: use tagged SRB requests if supported by the device" has been added to the 4.4-stable tree To: longli@microsoft.com, gregkh@linuxfoundation.org, kys@microsoft.com, martin.petersen@oracle.com Cc: , From: Date: Wed, 08 Mar 2017 14:12:59 +0100 Message-ID: <1488978779117159@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled scsi: storvsc: use tagged SRB requests if supported by the device to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: scsi-storvsc-use-tagged-srb-requests-if-supported-by-the-device.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 3cd6d3d9b1abab8dcdf0800224ce26daac24eea2 Mon Sep 17 00:00:00 2001 From: Long Li Date: Wed, 14 Dec 2016 18:46:01 -0800 Subject: scsi: storvsc: use tagged SRB requests if supported by the device From: Long Li commit 3cd6d3d9b1abab8dcdf0800224ce26daac24eea2 upstream. Properly set SRB flags when hosting device supports tagged queuing. This patch improves the performance on Fiber Channel disks. Signed-off-by: Long Li Reviewed-by: K. Y. Srinivasan Signed-off-by: K. Y. Srinivasan Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/storvsc_drv.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -135,6 +135,8 @@ struct hv_fc_wwn_packet { #define SRB_FLAGS_PORT_DRIVER_RESERVED 0x0F000000 #define SRB_FLAGS_CLASS_DRIVER_RESERVED 0xF0000000 +#define SP_UNTAGGED ((unsigned char) ~0) +#define SRB_SIMPLE_TAG_REQUEST 0x20 /* * Platform neutral description of a scsi request - @@ -1409,6 +1411,13 @@ static int storvsc_queuecommand(struct S vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DISABLE_SYNCH_TRANSFER; + if (scmnd->device->tagged_supported) { + vm_srb->win8_extension.srb_flags |= + (SRB_FLAGS_QUEUE_ACTION_ENABLE | SRB_FLAGS_NO_QUEUE_FREEZE); + vm_srb->win8_extension.queue_tag = SP_UNTAGGED; + vm_srb->win8_extension.queue_action = SRB_SIMPLE_TAG_REQUEST; + } + /* Build the SRB */ switch (scmnd->sc_data_direction) { case DMA_TO_DEVICE: Patches currently in stable-queue which might be from longli@microsoft.com are queue-4.4/scsi-storvsc-use-tagged-srb-requests-if-supported-by-the-device.patch queue-4.4/scsi-storvsc-properly-set-residual-data-length-on-errors.patch queue-4.4/scsi-storvsc-properly-handle-srb_error-when-sense-message-is-present.patch