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authorVitaly Kuznetsov <vkuznets@redhat.com>2015-04-11 18:07:58 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-24 12:17:42 -0700
commita4d1ee5b0255a135fead1d62a7fc7e6fe718b66e (patch)
treeb8dd663c221c93ad4655231141b951d2827f461c /drivers
parentcd8dc0548511efff7a97d978f989ce67a883f9a5 (diff)
downloadlinux-a4d1ee5b0255a135fead1d62a7fc7e6fe718b66e.tar.bz2
Drivers: hv: fcopy: full handshake support
Introduce FCOPY_VERSION_1 to support kernel replying to the negotiation message with its own version. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hv/hv_fcopy.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c
index 6a8ec9fb0869..b7b528cd481b 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:
/*