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Subject[PATCH 10/28] Drivers: hv: Save and export negotiated vmbus version
Date
Export the negotiated vmbus version as this may be useful for
individual drivers.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
---
drivers/hv/connection.c | 9 +++++++++
include/linux/hyperv.h | 6 ++++++
2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 2b56a3f..70ea5d1 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -30,6 +30,7 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/hyperv.h>
+#include <linux/export.h>
#include <asm/hyperv.h>
#include "hyperv_vmbus.h"

@@ -54,6 +55,12 @@ struct vmbus_connection vmbus_connection = {

#define VERSION_INVAL -1

+/*
+ * Negotiated protocol version with the host.
+ */
+__u32 vmbus_proto_version;
+EXPORT_SYMBOL_GPL(vmbus_proto_version);
+
static __u32 vmbus_get_next_version(__u32 current_version)
{
switch (current_version) {
@@ -215,6 +222,8 @@ int vmbus_connect(void)
if (version == VERSION_INVAL)
goto cleanup;

+ vmbus_proto_version = version;
+ pr_info("Negotiated host information %d\n", version);
kfree(msginfo);
return 0;

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index bee559a..134a202 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1204,5 +1204,11 @@ int hv_kvp_init(struct hv_util_service *);
void hv_kvp_deinit(void);
void hv_kvp_onchannelcallback(void *);

+/*
+ * Negotiated version with the Host.
+ */
+
+extern __u32 vmbus_proto_version;
+
#endif /* __KERNEL__ */
#endif /* _HYPERV_H */
--
1.7.4.1


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