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[PATCH RESEND V2 1/7] scsi: storvsc: Rather than look for sets of specific protocol versions, make decisions based on ranges.

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  [PATCH RESEND V2 1/7] scsi: storvsc: Rather than look for sets of specific protocol versions, make decisions based on ranges. "K. Y. Srinivasan" <kys@microsoft.com> - 2015-08-13 16:20 +0200
    [PATCH RESEND V2 2/7] scsi: storvsc: Use a single value to track protocol versions "K. Y. Srinivasan" <kys@microsoft.com> - 2015-08-13 16:20 +0200
    [PATCH RESEND V2 6/7] scsi: storvsc: Allow write_same when host is windows 10 "K. Y. Srinivasan" <kys@microsoft.com> - 2015-08-13 16:20 +0200
    [PATCH RESEND V2 7/7] scsi: storvsc: Set the error code correctly in failure conditions "K. Y. Srinivasan" <kys@microsoft.com> - 2015-08-13 16:20 +0200
    [PATCH RESEND V2 5/7] scsi: storvsc: use storage protocol version to determine storage capabilities "K. Y. Srinivasan" <kys@microsoft.com> - 2015-08-13 16:20 +0200
    [PATCH RESEND V2 4/7] scsi: storvsc: use correct defaults for values determined by protocol negotiation "K. Y. Srinivasan" <kys@microsoft.com> - 2015-08-13 16:30 +0200

#1206840 — [PATCH RESEND V2 1/7] scsi: storvsc: Rather than look for sets of specific protocol versions, make decisions based on ranges.

From: Keith Mange <keith.mange@microsoft.com>

Rather than look for sets of specific protocol versions,
make decisions based on ranges. This will be safer and require fewer changes
going forward as we add more storage protocol versions.

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 |   11 +++--------
 1 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 3c6584f..582f3b5 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -988,8 +988,7 @@ static int storvsc_channel_init(struct hv_device *device)
 	 * support multi-channel.
 	 */
 	max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
-	if ((vmbus_proto_version != VERSION_WIN7) &&
-	   (vmbus_proto_version != VERSION_WS2008))  {
+	if (vmbus_proto_version >= VERSION_WIN8) {
 		if (vstor_packet->storage_channel_properties.flags &
 		    STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
 			process_sub_channels = true;
@@ -1758,9 +1757,7 @@ static int storvsc_probe(struct hv_device *device,
 	 * set state to properly communicate with the host.
 	 */
 
-	switch (vmbus_proto_version) {
-	case VERSION_WS2008:
-	case VERSION_WIN7:
+	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;
@@ -1768,8 +1765,7 @@ static int storvsc_probe(struct hv_device *device,
 		max_luns_per_target = STORVSC_IDE_MAX_LUNS_PER_TARGET;
 		max_targets = STORVSC_IDE_MAX_TARGETS;
 		max_channels = STORVSC_IDE_MAX_CHANNELS;
-		break;
-	default:
+	} else {
 		sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
 		vmscsi_size_delta = 0;
 		vmstor_current_major = VMSTOR_WIN8_MAJOR;
@@ -1783,7 +1779,6 @@ static int storvsc_probe(struct hv_device *device,
 		 * VCPUs in the guest.
 		 */
 		max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel);
-		break;
 	}
 
 	scsi_driver.can_queue = (max_outstanding_req_per_channel *
-- 
1.7.4.1

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#1206844 — [PATCH RESEND V2 2/7] scsi: storvsc: Use a single value to track protocol versions

From: Keith Mange <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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#1206846 — [PATCH RESEND V2 6/7] scsi: storvsc: Allow write_same when host is windows 10

From: Keith Mange <keith.mange@microsoft.com>

Allow WRITE_SAME for Windows10 and above hosts.

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 |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 58fa47a..021cbdf 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1488,7 +1488,8 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
 
 	/*
 	 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
-	 * if the device is a MSFT virtual device.
+	 * if the device is a MSFT virtual device.  If the host is
+	 * WIN10 or newer, allow write_same.
 	 */
 	if (!strncmp(sdevice->vendor, "Msft", 4)) {
 		switch (vmstor_proto_version) {
@@ -1497,6 +1498,9 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
 			sdevice->scsi_level = SCSI_SPC_3;
 			break;
 		}
+
+		if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10)
+			sdevice->no_write_same = 0;
 	}
 
 	return 0;
-- 
1.7.4.1

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#1206848 — [PATCH RESEND V2 7/7] scsi: storvsc: Set the error code correctly in failure conditions

In the function storvsc_channel_init(), error code was not getting
set correctly in some of the failure cases. Fix this issue.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/scsi/storvsc_drv.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 021cbdf..aac8297 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -960,8 +960,10 @@ static int storvsc_channel_init(struct hv_device *device)
 	}
 
 	if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
-	    vstor_packet->status != 0)
+	    vstor_packet->status != 0) {
+		ret = -EINVAL;
 		goto cleanup;
+	}
 
 
 	for (i = 0; i < VMSTOR_NUM_PROTOCOLS; i++) {
@@ -1040,8 +1042,10 @@ static int storvsc_channel_init(struct hv_device *device)
 	}
 
 	if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
-	    vstor_packet->status != 0)
+	    vstor_packet->status != 0) {
+		ret = -EINVAL;
 		goto cleanup;
+	}
 
 	/*
 	 * Check to see if multi-channel support is there.
@@ -1078,8 +1082,10 @@ static int storvsc_channel_init(struct hv_device *device)
 	}
 
 	if (vstor_packet->operation != VSTOR_OPERATION_COMPLETE_IO ||
-	    vstor_packet->status != 0)
+	    vstor_packet->status != 0) {
+		ret = -EINVAL;
 		goto cleanup;
+	}
 
 	if (process_sub_channels)
 		handle_multichannel_storage(device, max_chns);
-- 
1.7.4.1

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#1206849 — [PATCH RESEND V2 5/7] scsi: storvsc: use storage protocol version to determine storage capabilities

From: Keith Mange <keith.mange@microsoft.com>

Use storage protocol version instead of vmbus protocol
version when determining storage capabilities.

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 |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 6f38cdf..58fa47a 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1049,7 +1049,7 @@ static int storvsc_channel_init(struct hv_device *device)
 	 * support multi-channel.
 	 */
 	max_chns = vstor_packet->storage_channel_properties.max_channel_cnt;
-	if (vmbus_proto_version >= VERSION_WIN8) {
+	if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN8) {
 		if (vstor_packet->storage_channel_properties.flags &
 		    STORAGE_CHANNEL_SUPPORTS_MULTI_CHANNEL)
 			process_sub_channels = true;
@@ -1491,9 +1491,9 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
 	 * if the device is a MSFT virtual device.
 	 */
 	if (!strncmp(sdevice->vendor, "Msft", 4)) {
-		switch (vmbus_proto_version) {
-		case VERSION_WIN8:
-		case VERSION_WIN8_1:
+		switch (vmstor_proto_version) {
+		case VMSTOR_PROTO_VERSION_WIN8:
+		case VMSTOR_PROTO_VERSION_WIN8_1:
 			sdevice->scsi_level = SCSI_SPC_3;
 			break;
 		}
-- 
1.7.4.1

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#1206859 — [PATCH RESEND V2 4/7] scsi: storvsc: use correct defaults for values determined by protocol negotiation

From: Keith Mange <keith.mange@microsoft.com>

Use correct defaults for values determined by protocol negotiation,
instead of resetting them with every scsi controller.

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 |   33 +++++++++++++++++++--------------
 1 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index f29871e..6f38cdf 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -151,19 +151,17 @@ struct hv_fc_wwn_packet {
 
 /*
  * Sense buffer size changed in win8; have a run-time
- * variable to track the size we should use.
+ * variable to track the size we should use.  This value will
+ * likely change during protocol negotiation but it is valid
+ * to start by assuming pre-Win8.
  */
-static int sense_buffer_size;
+static int sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
 
 /*
- * The size of the vmscsi_request has changed in win8. The
- * additional size is because of new elements added to the
- * structure. These elements are valid only when we are talking
- * to a win8 host.
- * Track the correction to size we need to apply.
- */
-
-static int vmscsi_size_delta;
+ * The storage protocol version is determined during the
+ * initial exchange with the host.  It will indicate which
+ * storage functionality is available in the host.
+*/
 static int vmstor_proto_version;
 
 struct vmscsi_win8_extension {
@@ -209,6 +207,17 @@ struct vmscsi_request {
 
 
 /*
+ * The size of the vmscsi_request has changed in win8. The
+ * additional size is because of new elements added to the
+ * structure. These elements are valid only when we are talking
+ * to a win8 host.
+ * Track the correction to size we need to apply. This value
+ * will likely change during protocol negotiation but it is
+ * valid to start by assuming pre-Win8.
+ */
+static int vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
+
+/*
  * The list of storage protocols in order of preference.
  */
 struct vmstor_protocol {
@@ -1810,14 +1819,10 @@ 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);
 		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;
 		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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