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Commit 27f5ef37 authored by Long Li's avatar Long Li Committed by Greg Kroah-Hartman
Browse files

scsi: storvsc: use tagged SRB requests if supported by the device 



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: default avatarLong Li <longli@microsoft.com>
Reviewed-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2937e22c

drivers/scsi/storvsc_drv.c

+9 −0
Original line number Diff line number Diff line
@@ -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 Scsi_Host *host, struct scsi_cmnd *scmnd) 
	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: