scsi: smartpqi: limit transfer length to 1MB

The smartpqi firmware will bypass the cache for any request larger than
1MB, so we should cap the request size to avoid any performance
degradation in kernels later than v4.3

This degradation is caused from d2be537c3ba3568acd79cd178327b842e60d035e,
which changed max_sectors_kb to 1280k, but the hardware is able to
work fine with it, so the true fix should be from smartpqi driver.

Signed-off-by: Yadan Fan <ydfan@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index 07ec8a8877dec04b6ac3ea35aef2ac1a6c6c3e01..e164ffade38a7166690a9ecb206be1165e62278c 100644 (file)
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -690,7 +690,7 @@ struct pqi_config_table_heartbeat {
 
 #define PQI_MAX_OUTSTANDING_REQUESTS           ((u32)~0)
 #define PQI_MAX_OUTSTANDING_REQUESTS_KDUMP     32
-#define PQI_MAX_TRANSFER_SIZE                  (4 * 1024U * 1024U)
+#define PQI_MAX_TRANSFER_SIZE                  (1024U * 1024U)
 #define PQI_MAX_TRANSFER_SIZE_KDUMP            (512 * 1024U)
 
 #define RAID_MAP_MAX_ENTRIES           1024