mpt3sas: Set maximum transfer length per IO to 4MB for VDs

Set maximum transfer length per IO on RAID volumes to 4MB by setting VD's queue's max_sector to 8192. Signed-off-by: Chaitra P B <chaitra.basappa@broadcom.com> Reviewed-by: Tomas Henzl <thenzl@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
mariux64 · May 11, 2016 · 6c19709 · 6c19709
1 parent b2500d7
commit 6c19709
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diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h
@@ -112,6 +112,8 @@
 #define MPT3SAS_SAS_QUEUE_DEPTH		254
 #define MPT3SAS_RAID_QUEUE_DEPTH	128
 
+#define MPT3SAS_RAID_MAX_SECTORS	8192
+
 #define MPT_NAME_LENGTH			32	/* generic length of strings */
 #define MPT_STRING_LENGTH		64
 

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -1909,6 +1909,14 @@ scsih_slave_configure(struct scsi_device *sdev)
 			    (unsigned long long)raid_device->wwid,
 			    raid_device->num_pds, ds);
 
+		if (shost->max_sectors > MPT3SAS_RAID_MAX_SECTORS) {
+			blk_queue_max_hw_sectors(sdev->request_queue,
+						MPT3SAS_RAID_MAX_SECTORS);
+			sdev_printk(KERN_INFO, sdev,
+					"Set queue's max_sector to: %u\n",
+						MPT3SAS_RAID_MAX_SECTORS);
+		}
+
 		scsih_change_queue_depth(sdev, qdepth);
 
 		/* raid transport support */