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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>
This commit is contained in:
Long Li 2019-09-06 10:24:20 -07:00 committed by Martin K. Petersen
parent 4b062e7cf9
commit 0ed8810276
1 changed files with 1 additions and 2 deletions
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3
drivers/scsi/storvsc_drv.c
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@ -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.