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authorChaitra P B2016-05-06 14:29:30 +0530
committerMartin K. Petersen2016-05-11 16:13:38 -0400
commit6c197093847e8cdec844df39a373bfe1f9a1ac8a (patch)
tree9e93320a82aa2d42d938d47eb27090f0a91b073c /drivers/scsi
parentb2500d76a0dbaa8993cd6b43941d23d31a312831 (diff)
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>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/mpt3sas/mpt3sas_base.h2
-rw-r--r--drivers/scsi/mpt3sas/mpt3sas_scsih.c8
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h
index af2099a5d3f7..71b1c58fec3b 100644
--- 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
index d256fc0fcc98..7217218edbac 100644
--- 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 */