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>
diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index d256fc0..7217218 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -1909,6 +1909,14 @@
(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 */