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path: root/drivers/hv/hv_kvp.c
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Diffstat (limited to 'drivers/hv/hv_kvp.c')
-rw-r--r--drivers/hv/hv_kvp.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index 9b9b370fe22a..cb1a9160aab1 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -78,9 +78,11 @@ static void kvp_send_key(struct work_struct *dummy);
static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error);
static void kvp_timeout_func(struct work_struct *dummy);
+static void kvp_host_handshake_func(struct work_struct *dummy);
static void kvp_register(int);
static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func);
+static DECLARE_DELAYED_WORK(kvp_host_handshake_work, kvp_host_handshake_func);
static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
static const char kvp_devname[] = "vmbus/hv_kvp";
@@ -130,6 +132,11 @@ static void kvp_timeout_func(struct work_struct *dummy)
hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
}
+static void kvp_host_handshake_func(struct work_struct *dummy)
+{
+ hv_poll_channel(kvp_transaction.recv_channel, hv_kvp_onchannelcallback);
+}
+
static int kvp_handle_handshake(struct hv_kvp_msg *msg)
{
switch (msg->kvp_hdr.operation) {
@@ -154,6 +161,12 @@ static int kvp_handle_handshake(struct hv_kvp_msg *msg)
pr_debug("KVP: userspace daemon ver. %d registered\n",
KVP_OP_REGISTER);
kvp_register(dm_reg_value);
+
+ /*
+ * If we're still negotiating with the host cancel the timeout
+ * work to not poll the channel twice.
+ */
+ cancel_delayed_work_sync(&kvp_host_handshake_work);
hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
return 0;
@@ -594,7 +607,22 @@ void hv_kvp_onchannelcallback(void *context)
struct icmsg_negotiate *negop = NULL;
int util_fw_version;
int kvp_srv_version;
+ static enum {NEGO_NOT_STARTED,
+ NEGO_IN_PROGRESS,
+ NEGO_FINISHED} host_negotiatied = NEGO_NOT_STARTED;
+ if (host_negotiatied == NEGO_NOT_STARTED &&
+ kvp_transaction.state < HVUTIL_READY) {
+ /*
+ * If userspace daemon is not connected and host is asking
+ * us to negotiate we need to delay to not lose messages.
+ * This is important for Failover IP setting.
+ */
+ host_negotiatied = NEGO_IN_PROGRESS;
+ schedule_delayed_work(&kvp_host_handshake_work,
+ HV_UTIL_NEGO_TIMEOUT * HZ);
+ return;
+ }
if (kvp_transaction.state > HVUTIL_READY)
return;
@@ -672,6 +700,8 @@ void hv_kvp_onchannelcallback(void *context)
vmbus_sendpacket(channel, recv_buffer,
recvlen, requestid,
VM_PKT_DATA_INBAND, 0);
+
+ host_negotiatied = NEGO_FINISHED;
}
}
@@ -708,6 +738,7 @@ hv_kvp_init(struct hv_util_service *srv)
void hv_kvp_deinit(void)
{
kvp_transaction.state = HVUTIL_DEVICE_DYING;
+ cancel_delayed_work_sync(&kvp_host_handshake_work);
cancel_delayed_work_sync(&kvp_timeout_work);
cancel_work_sync(&kvp_sendkey_work);
hvutil_transport_destroy(hvt);