[PATCH 20/21] Drivers: hv: fcopy: full handshake support

[K. Y. Srinivasan]

From: Vitaly Kuznetsov <vkuzn...@redhat.com>

Introduce FCOPY_VERSION_1 to support kernel replying to the negotiation
message with its own version.

Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
Tested-by: Alex Ng <ale...@microsoft.com>
Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
---
 drivers/hv/hv_fcopy.c       |   16 +++++++++++++++-
 include/uapi/linux/hyperv.h |    3 ++-
 tools/hv/hv_fcopy_daemon.c  |   15 +++++++++++++++
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c
index 6a8ec9f..b7b528c 100644
--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -62,6 +62,10 @@ static DECLARE_WORK(fcopy_send_work, fcopy_send_data);
 static const char fcopy_devname[] = "vmbus/hv_fcopy";
 static u8 *recv_buffer;
 static struct hvutil_transport *hvt;
+/*
+ * This state maintains the version number registered by the daemon.
+ */
+static int dm_reg_value;
 
 static void fcopy_timeout_func(struct work_struct *dummy)
 {
@@ -81,8 +85,18 @@ static void fcopy_timeout_func(struct work_struct *dummy)
 
 static int fcopy_handle_handshake(u32 version)
 {
+       u32 our_ver = FCOPY_CURRENT_VERSION;
+
        switch (version) {
-       case FCOPY_CURRENT_VERSION:
+       case FCOPY_VERSION_0:
+               /* Daemon doesn't expect us to reply */
+               dm_reg_value = version;
+               break;
+       case FCOPY_VERSION_1:
+               /* Daemon expects us to reply with our own version */
+               if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver)))
+                       return -EFAULT;
+               dm_reg_value = version;
                break;
        default:
                /*
diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
index 66c76df..e4c0a35 100644
--- a/include/uapi/linux/hyperv.h
+++ b/include/uapi/linux/hyperv.h
@@ -105,7 +105,8 @@ struct hv_vss_msg {
  */
 
 #define FCOPY_VERSION_0 0
-#define FCOPY_CURRENT_VERSION FCOPY_VERSION_0
+#define FCOPY_VERSION_1 1
+#define FCOPY_CURRENT_VERSION FCOPY_VERSION_1
 #define W_MAX_PATH 260
 
 enum hv_fcopy_op {
diff --git a/tools/hv/hv_fcopy_daemon.c b/tools/hv/hv_fcopy_daemon.c
index 9445d8f..5480e4e 100644
--- a/tools/hv/hv_fcopy_daemon.c
+++ b/tools/hv/hv_fcopy_daemon.c
@@ -137,6 +137,8 @@ int main(int argc, char *argv[])
        int version = FCOPY_CURRENT_VERSION;
        char *buffer[4096 * 2];
        struct hv_fcopy_hdr *in_msg;
+       int in_handshake = 1;
+       __u32 kernel_modver;
 
        static struct option long_options[] = {
                {"help",        no_argument,       0,  'h' },
@@ -191,6 +193,19 @@ int main(int argc, char *argv[])
                        syslog(LOG_ERR, "pread failed: %s", strerror(errno));
                        exit(EXIT_FAILURE);
                }
+
+               if (in_handshake) {
+                       if (len != sizeof(kernel_modver)) {
+                               syslog(LOG_ERR, "invalid version negotiation");
+                               exit(EXIT_FAILURE);
+                       }
+                       kernel_modver = *(__u32 *)buffer;
+                       in_handshake = 0;
+                       syslog(LOG_INFO, "HV_FCOPY: kernel module version: %d",
+                              kernel_modver);
+                       continue;
+               }
+
                in_msg = (struct hv_fcopy_hdr *)buffer;
 
                switch (in_msg->operation) {
-- 
1.7.4.1

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