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scsi: storvsc: Set up correct queue depth values for IDE devices 

Unlike SCSI and FC, we don't use multiple channels for IDE.  Also fix
the calculation for sub-channels.

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 2018-03-22 14:47:18 -07:00 committed by Martin K. Petersen
parent 8e1ceafe50
commit f286299c1d
1 changed files with 5 additions and 2 deletions
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7
drivers/scsi/storvsc_drv.c
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@ -1722,11 +1722,14 @@ static int storvsc_probe(struct hv_device *device,
max_targets = STORVSC_MAX_TARGETS;
max_channels = STORVSC_MAX_CHANNELS;
/*
* On Windows8 and above, we support sub-channels for storage.
* On Windows8 and above, we support sub-channels for storage
* on SCSI and FC controllers.
* The number of sub-channels offerred is based on the number of
* VCPUs in the guest.
*/
max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel);
if (!dev_is_ide)
max_sub_channels =
(num_cpus - 1) / storvsc_vcpus_per_sub_channel;
}
scsi_driver.can_queue = (max_outstanding_req_per_channel *