linux-kernel - [PATCH] storvsc: Set up correct queue depth values for IDE devices

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Date:   Thu, 15 Mar 2018 16:52:23 -0700
From:   Long Li <longli@...hange.microsoft.com>
To:     "K . Y . Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "James E . J . Bottomley" <JBottomley@...n.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        devel@...uxdriverproject.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Long Li <longli@...rosoft.com>
Subject: [PATCH] storvsc: Set up correct queue depth values for IDE devices

From: Long Li <longli@...rosoft.com>

Unlike SCSI and FC, we don't use multiple channels for IDE. So set queue depth
correctly for IDE.

Also set the correct cmd_per_lun for all devices.

Signed-off-by: Long Li <longli@...rosoft.com>
---
 drivers/scsi/storvsc_drv.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 8c51d628b52e..fba170640e9c 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1722,15 +1722,19 @@ 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 / storvsc_vcpus_per_sub_channel;
 	}
 
 	scsi_driver.can_queue = (max_outstanding_req_per_channel *
 				 (max_sub_channels + 1));
+	scsi_driver.cmd_per_lun = scsi_driver.can_queue;
 
 	host = scsi_host_alloc(&scsi_driver,
 			       sizeof(struct hv_host_device));
-- 
2.14.1