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Subject[PATCH 2/6] scsi: storvsc: Use a single value to track protocol versions
Date
From: keith.mange@microsoft.com <keith.mange@microsoft.com>

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>
---
drivers/scsi/storvsc_drv.c | 35 +++++++++--------------------------
1 files changed, 9 insertions(+), 26 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 582f3b5..5f9d133 100644
--- 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 {
/*
@@ -481,18 +479,6 @@ 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
@@ -930,8 +916,7 @@ 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.
@@ -1562,7 +1547,7 @@ 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
@@ -1760,16 +1745,14 @@ 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;
--
1.7.4.1


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