[ycabled] fix insert events from xcvrd;cleanup some mux toggle logic (s…

…onic-net#287)

Signed-off-by: vaibhav-dahiya vdahiya@microsoft.com
This PR intends to help fix the surplus amount of insert/delete events that ycabled gets it is first spawned, it fixes the logic where an insert event is only handled the way it is collected by xcvrd one time only.

Previously there was a known issue for spurious insert/delete events captured by ycabled on config reload, this PR fixes it

This PR also cleans up some mux toggle blocking other txns logic.

Description
Motivation and Context
How Has This Been Tested?
Unit-tests and deploying changes on Testbed

Additional Information (Optional)

sonic-ycabled/tests/test_ycable.py

@@ -294,6 +294,16 @@ def test_DaemonYcable_init_deinit_full(self):
         # TODO: fow now we only simply call ycable.init/deinit without any further check, it only makes sure that
         # ycable.init/deinit will not raise unexpected exception. In future, probably more check will be added
 
+    @patch('ycable.ycable_utilities.y_cable_helper.change_ports_status_for_y_cable_change_event', MagicMock(return_value=0))
+    def test_handle_state_update_task(self):
+
+        port = "Ethernet0"
+        fvp_dict = {}
+        y_cable_presence = False
+        stopping_event = None
+        rc = handle_state_update_task(port, fvp_dict, y_cable_presence, stopping_event)
+        assert(rc == None)
+
 
 def wait_until(total_wait_time, interval, call_back, *args, **kwargs):
     wait_time = 0

sonic-ycabled/ycable/ycable.py

@@ -80,6 +80,14 @@ def detect_port_in_error_status(logical_port_name, status_tbl):
     else:
         return False
 
+def handle_state_update_task(port, fvp_dict, y_cable_presence, stopping_event):
+
+    port_dict = {}
+    port_dict[port] = fvp_dict.get('status', None)
+
+    y_cable_helper.change_ports_status_for_y_cable_change_event(
+        port_dict, y_cable_presence, stopping_event)
+
 #
 # Helper classes ===============================================================
 #
@@ -149,7 +157,6 @@ def task_worker(self, stopping_event, sfp_error_event, y_cable_presence):
 
         # Connect to STATE_DB and listen to ycable transceiver status update tables
         state_db, status_tbl= {}, {}
-        port_dict = {}
 
         sel = swsscommon.Select()
 
@@ -195,10 +202,8 @@ def task_worker(self, stopping_event, sfp_error_event, y_cable_presence):
                 if not fvp_dict:
                     continue
 
-                port_dict[port] = fvp_dict.get('status', None)
+                handle_state_update_task(port, fvp_dict, y_cable_presence, stopping_event)
 
-                y_cable_helper.change_ports_status_for_y_cable_change_event(
-                    port_dict, y_cable_presence, stopping_event)
 
     def task_run(self, sfp_error_event, y_cable_presence):
         if self.task_stopping_event.is_set():

sonic-ycabled/ycable/ycable_utilities/y_cable_helper.py

@@ -2274,6 +2274,9 @@ def handle_config_prbs_cmd_arg_tbl_notification(fvp, xcvrd_config_prbs_cmd_arg_t
                     status = -1
                     helper_logger.log_warning("Failed to execute the disable prbs API for port {} due to {}".format(physical_port,repr(e)))
         elif config_prbs_mode == "reset":
+
+            port_instance.mux_toggle_status = port_instance.MUX_TOGGLE_STATUS_NOT_INITIATED_OR_FINISHED
+            port_instance.download_firmware_status == port_instance.FIRMWARE_DOWNLOAD_STATUS_NOT_INITIATED_OR_FINISHED
             with y_cable_port_locks[physical_port]:
                 try:
                     status = port_instance.reset(target)