Introduce FCOPY_VERSION_1 to support kernel replying to the negotiation
message with its own version.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
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) {
--
1.9.3
--
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