On Tue, Sep 06, 2016 at 02:25:41PM -0700, Long Li wrote:
> From: Long Li <lon...@microsoft.com>
>
> Properly set SRB flags when hosting device supports tagged queuing. This
> patch improves the performance on Fiber Channel disks.
ENOSIGNEDOFF and please use checkpatch.pl on the patch.
>
> ---
> drivers/scsi/storvsc_drv.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> index 8ccfc9e..a8f3e4c 100644
> --- 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 +1453,12 @@ 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:
> --
> 1.8.5.6
>
> --
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--
Johannes Thumshirn Storage
jthumsh...@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
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