Introduce mgmtinit delay after transceiver module insertion (#201)

As per CMIS spec : http://www.qsfp-dd.com/wp-content/uploads/2021/05/CMIS5p0.pdf (see D.1.3 Software Configuration and Initialization) after module is inserted, delay of 2 seconds is required for MgmtInit to complete.

Signed-off-by: Prince George <prgeor@microsoft.com>

sonic-xcvrd/xcvrd/xcvrd.py

@@ -39,6 +39,12 @@
 
 SELECT_TIMEOUT_MSECS = 1000
 
+# Mgminit time required as per CMIS spec
+MGMT_INIT_TIME_DELAY_SECS = 2
+
+# SFP insert event poll duration
+SFP_INSERT_EVENT_POLL_PERIOD_MSECS = 1000
+
 DOM_INFO_UPDATE_PERIOD_SECS = 60
 TIME_FOR_SFP_READY_SECS = 1
 XCVRD_MAIN_THREAD_SLEEP_SECS = 60
@@ -171,6 +177,20 @@ def _wrapper_get_transceiver_dom_threshold_info(physical_port):
             pass
     return platform_sfputil.get_transceiver_dom_threshold_info_dict(physical_port)
 
+# Soak SFP insert event until management init completes
+def _wrapper_soak_sfp_insert_event(sfp_insert_events, port_dict):
+    for key, value in list(port_dict.items()):
+        if value == sfp_status_helper.SFP_STATUS_INSERTED:
+            sfp_insert_events[key] = time.time()
+            del port_dict[key]
+        elif value == sfp_status_helper.SFP_STATUS_REMOVED:
+            if key in sfp_insert_events:
+                del sfp_insert_events[key]
+
+    for key, itime in list(sfp_insert_events.items()):
+        if time.time() - itime >= MGMT_INIT_TIME_DELAY_SECS:
+            port_dict[key] = sfp_status_helper.SFP_STATUS_INSERTED
+            del sfp_insert_events[key]
 
 def _wrapper_get_transceiver_change_event(timeout):
     if platform_chassis is not None:
@@ -201,8 +221,8 @@ def _wrapper_get_sfp_error_description(physical_port):
         except NotImplementedError:
             pass
     return None
-# Remove unnecessary unit from the raw data
 
+# Remove unnecessary unit from the raw data
 
 def beautify_dom_info_dict(dom_info_dict, physical_port):
     dom_info_dict['temperature'] = strip_unit_and_beautify(dom_info_dict['temperature'], TEMP_UNIT)
@@ -262,7 +282,6 @@ def beautify_dom_threshold_info_dict(dom_info_dict):
 
 # Update port sfp info in db
 
-
 def post_port_sfp_info_to_db(logical_port_name, table, transceiver_dict,
                              stop_event=threading.Event()):
     ganged_port = False
@@ -903,6 +922,7 @@ class SfpStateUpdateTask(object):
     def __init__(self):
         self.task_process = None
         self.task_stopping_event = multiprocessing.Event()
+        self.sfp_insert_events = {}
 
     def _mapping_event_from_change_event(self, status, port_dict):
         """
@@ -1020,7 +1040,13 @@ def task_worker(self, stopping_event, sfp_error_event, y_cable_presence):
         while not stopping_event.is_set():
             next_state = state
             time_start = time.time()
+            # Ensure not to block for any event if sfp insert event is pending
+            if self.sfp_insert_events:
+                timeout = SFP_INSERT_EVENT_POLL_PERIOD_MSECS
             status, port_dict, error_dict = _wrapper_get_transceiver_change_event(timeout)
+            if status:
+                # Soak SFP insert events across various ports (updates port_dict)
+                _wrapper_soak_sfp_insert_event(self.sfp_insert_events, port_dict)
             if not port_dict:
                 continue
             helper_logger.log_debug("Got event {} {} in state {}".format(status, port_dict, state))