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authorLong Li <longli@microsoft.com>2019-09-06 10:24:20 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2019-09-23 23:09:42 -0400
commit0ed8810276907c8a633dc8cecc48dabb6678cd23 (patch)
tree82613f004b9c2effbf154b63590b8653566b3c04 /drivers/scsi/storvsc_drv.c
parent4b062e7cf940aa4f38fedc3a964b24cb095373f0 (diff)
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>
Diffstat (limited to 'drivers/scsi/storvsc_drv.c')
-rw-r--r--drivers/scsi/storvsc_drv.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index ed8b9ac805e6..542d2bac2922 100644
--- 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.