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 4.9-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-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3cd6d3d9b1abab8dcdf0800224ce26daac24eea2 Mon Sep 17 00:00:00 2001
From: Long Li <longli@xxxxxxxxxxxxx>
Date: Wed, 14 Dec 2016 18:46:01 -0800
Subject: scsi: storvsc: use tagged SRB requests if supported by the device
From: Long Li <longli@xxxxxxxxxxxxx>
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 <longli@xxxxxxxxxxxxx>
Reviewed-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/storvsc_drv.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -136,6 +136,8 @@ 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 -
@@ -1451,6 +1453,13 @@ 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@xxxxxxxxxxxxx are
queue-4.9/scsi-storvsc-use-tagged-srb-requests-if-supported-by-the-device.patch
queue-4.9/scsi-storvsc-properly-set-residual-data-length-on-errors.patch
queue-4.9/scsi-storvsc-properly-handle-srb_error-when-sense-message-is-present.patch