linux-kernel - [PATCH 4.17 11/56] scsi: aacraid: Fix PD performance regression over incorrect qd being set

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Date:   Tue, 10 Jul 2018 20:24:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Steve Best <sbest@...hat.com>,
        Raghava Aditya Renukunta 
        <RaghavaAditya.Renukunta@...rosemi.com>,
        David Carroll <David.Carroll@...rosemi.com>,
        "Ewan D. Milne" <emilne@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.17 11/56] scsi: aacraid: Fix PD performance regression over incorrect qd being set

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@...rosemi.com>

commit 59b433c825569ce251371485f0e29fca888b549d upstream.

The driver fails to set the correct queue depth for native devices, due to
failing to set the device type prior to calling aac_set_safw_target_qd().
This results in slave configure setting the queue depth to 1.

This causes around 30% performance degradation. Fixed by setting the dev
type before trying to set queue depth.

Reported-by: Steve Best <sbest@...hat.com>
Fixes: 0bcb45fb20c21 ("scsi: aacraid: Add helper function to set queue depth")
cc: stable@...r.kernel.org
Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@...rosemi.com>
Reviewed-by: David Carroll <David.Carroll@...rosemi.com>
Reviewed-by: Ewan D. Milne <emilne@...hat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/aacraid/aachba.c |   15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -1974,7 +1974,6 @@ static void aac_set_safw_attr_all_target
 	u32 lun_count, nexus;
 	u32 i, bus, target;
 	u8 expose_flag, attribs;
-	u8 devtype;

 	lun_count = aac_get_safw_phys_lun_count(dev);

@@ -1992,23 +1991,23 @@ static void aac_set_safw_attr_all_target
 			continue;

 		if (expose_flag != 0) {
-			devtype = AAC_DEVTYPE_RAID_MEMBER;
-			goto update_devtype;
+			dev->hba_map[bus][target].devtype =
+				AAC_DEVTYPE_RAID_MEMBER;
+			continue;
 		}

 		if (nexus != 0 && (attribs & 8)) {
-			devtype = AAC_DEVTYPE_NATIVE_RAW;
+			dev->hba_map[bus][target].devtype =
+				AAC_DEVTYPE_NATIVE_RAW;
 			dev->hba_map[bus][target].rmw_nexus =
 					nexus;
 		} else
-			devtype = AAC_DEVTYPE_ARC_RAW;
+			dev->hba_map[bus][target].devtype =
+				AAC_DEVTYPE_ARC_RAW;

 		dev->hba_map[bus][target].scan_counter = dev->scan_counter;

 		aac_set_safw_target_qd(dev, bus, target);
-
-update_devtype:
-		dev->hba_map[bus][target].devtype = devtype;
 	}
 }