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Subject[PATCH 4/6] scsi: storvsc: use correct defaults for values determined by protocol negotiation
Date
From: keith.mange@microsoft.com <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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