scsi: storvsc: setup 1:1 mapping between hardware queue and CPU queue

storvsc doesn't use a dedicated hardware queue for a given CPU queue. When
issuing I/O, it selects returning CPU (hardware queue) dynamically based on
vmbus channel usage across all channels.

This patch advertises num_present_cpus() as number of hardware queues. This
will have upper layer setup 1:1 mapping between hardware queue and CPU
queue and avoid unnecessary locking when issuing I/O.

Link: https://lore.kernel.org/r/1567790660-48142-1-git-send-email-longli@linuxonhyperv.com
Signed-off-by: Long Li <longli@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index ed8b9ac805e6211ecb2c80570fb21e9531ece438..542d2bac2922c90b0f38ac637edbe60b04df78fc 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1837,8 +1837,7 @@ static int storvsc_probe(struct hv_device *device,
        /*
         * Set the number of HW queues we are supporting.
         */
-       if (stor_device->num_sc != 0)
-               host->nr_hw_queues = stor_device->num_sc + 1;
+       host->nr_hw_queues = num_present_cpus();
 
        /*
         * Set the error handler work queue.