[SCSI] vmw_pvscsi: Add support for I/O requests coalescing.
This change allows pvscsi driver to coalesce I/O requests
before issuing them. The number of I/O's coalesced can be
dynamically configured based on the workload.
Signed-off-by: Rishi Mehta <rmehta@vmware.com>
Signed-off-by: Arvind Kumar <arvindkumar@vmware.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/vmw_pvscsi.h b/drivers/scsi/vmw_pvscsi.h
index a643775..15a9ac6 100644
--- a/drivers/scsi/vmw_pvscsi.h
+++ b/drivers/scsi/vmw_pvscsi.h
@@ -26,7 +26,7 @@
#include <linux/types.h>
-#define PVSCSI_DRIVER_VERSION_STRING "1.0.3.0-k"
+#define PVSCSI_DRIVER_VERSION_STRING "1.0.4.0-k"
#define PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT 128
@@ -117,8 +117,9 @@
PVSCSI_CMD_CONFIG = 7,
PVSCSI_CMD_SETUP_MSG_RING = 8,
PVSCSI_CMD_DEVICE_UNPLUG = 9,
+ PVSCSI_CMD_SETUP_REQCALLTHRESHOLD = 10,
- PVSCSI_CMD_LAST = 10 /* has to be last */
+ PVSCSI_CMD_LAST = 11 /* has to be last */
};
/*
@@ -141,6 +142,14 @@
u32 _pad;
} __packed;
+/*
+ * Command descriptor for PVSCSI_CMD_SETUP_REQCALLTHRESHOLD --
+ */
+
+struct PVSCSICmdDescSetupReqCall {
+ u32 enable;
+} __packed;
+
enum PVSCSIConfigPageType {
PVSCSI_CONFIG_PAGE_CONTROLLER = 0x1958,
PVSCSI_CONFIG_PAGE_PHY = 0x1959,
@@ -261,7 +270,9 @@
u32 cmpConsIdx;
u32 cmpNumEntriesLog2;
- u8 _pad[104];
+ u32 reqCallThreshold;
+
+ u8 _pad[100];
u32 msgProdIdx;
u32 msgConsIdx;