storvsc: Use a single value to track protocol versions

Use a single value to track protocol versions to simplify
comparisons and to be consistent with vmbus version tracking.

Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: Keith Mange <keith.mange@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 05f6f970826ed4a701fd95634f763265ac9a2360..367f66cc1f0721b35b94184836f82d0a0583f1b6 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -58,12 +58,11 @@
  * Win8: 5.1
  */
 
+#define VMSTOR_PROTO_VERSION(MAJOR_, MINOR_)   ((((MAJOR_) & 0xff) << 8) | \
+                                               (((MINOR_) & 0xff)))
 
-#define VMSTOR_WIN7_MAJOR 4
-#define VMSTOR_WIN7_MINOR 2
-
-#define VMSTOR_WIN8_MAJOR 5
-#define VMSTOR_WIN8_MINOR 1
+#define VMSTOR_PROTO_VERSION_WIN7      VMSTOR_PROTO_VERSION(4, 2)
+#define VMSTOR_PROTO_VERSION_WIN8      VMSTOR_PROTO_VERSION(5, 1)
 
 
 /*  Packet structure describing virtual storage requests. */
@@ -161,8 +160,7 @@ static int sense_buffer_size;
  */
 
 static int vmscsi_size_delta;
-static int vmstor_current_major;
-static int vmstor_current_minor;
+static int vmstor_proto_version;
 
 struct vmscsi_win8_extension {
        /*
@@ -474,18 +472,6 @@ done:
        kfree(wrk);
 }
 
-/*
- * Major/minor macros.  Minor version is in LSB, meaning that earlier flat
- * version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1).
- */
-
-static inline u16 storvsc_get_version(u8 major, u8 minor)
-{
-       u16 version;
-
-       version = ((major << 8) | minor);
-       return version;
-}
 
 /*
  * We can get incoming messages from the host that are not in response to
@@ -923,8 +909,7 @@ static int storvsc_channel_init(struct hv_device *device)
        vstor_packet->operation = VSTOR_OPERATION_QUERY_PROTOCOL_VERSION;
        vstor_packet->flags = REQUEST_COMPLETION_FLAG;
 
-       vstor_packet->version.major_minor =
-               storvsc_get_version(vmstor_current_major, vmstor_current_minor);
+       vstor_packet->version.major_minor = vmstor_proto_version;
 
        /*
         * The revision number is only used in Windows; set it to 0.
@@ -1555,7 +1540,7 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
        u32 payload_sz;
        u32 length;
 
-       if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
+       if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) {
                /*
                 * On legacy hosts filter unimplemented commands.
                 * Future hosts are expected to correctly handle
@@ -1761,16 +1746,14 @@ static int storvsc_probe(struct hv_device *device,
        if (vmbus_proto_version < VERSION_WIN8) {
                sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
                vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
-               vmstor_current_major = VMSTOR_WIN7_MAJOR;
-               vmstor_current_minor = VMSTOR_WIN7_MINOR;
+               vmstor_proto_version = VMSTOR_PROTO_VERSION_WIN7;
                max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET;
                max_targets = STORVSC_IDE_MAX_TARGETS;
                max_channels = STORVSC_IDE_MAX_CHANNELS;
        } else {
                sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
                vmscsi_size_delta = 0;
-               vmstor_current_major = VMSTOR_WIN8_MAJOR;
-               vmstor_current_minor = VMSTOR_WIN8_MINOR;
+               vmstor_proto_version = VMSTOR_PROTO_VERSION_WIN8;
                max_luns_per_target = STORVSC_MAX_LUNS_PER_TARGET;
                max_targets = STORVSC_MAX_TARGETS;
                max_channels = STORVSC_MAX_CHANNELS;