3.16.44-rc1 review patch. If anyone has any objections, please let me know.
------------------ From: Long Li <[email protected]> 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 <[email protected]> Reviewed-by: K. Y. Srinivasan <[email protected]> Signed-off-by: K. Y. Srinivasan <[email protected]> Signed-off-by: Martin K. Petersen <[email protected]> Signed-off-by: Ben Hutchings <[email protected]> --- drivers/scsi/storvsc_drv.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -133,6 +133,8 @@ 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 - @@ -1612,6 +1614,13 @@ 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:
