[Credo][Ycable] changes for synchronizing executing Telemetry API's when mux toggle is inprogress (#280)

In this PR, there is a support for adding a mux_toggle_status variable inside the base class for mux_cable.
Using this variable the Derived classes for mux_cable can check this and return in case of a mux_toggle_status is in progress.
From the higher layer this allows ycabled to synchronize the calls and not let mux_cable toggle to go in conjunction with some of the Telemetry calls.
Signed-off-by: vaibhav-dahiya vdahiya@microsoft.com

Description
Motivation and Context
To get the toggle time to a minimum/ not allow i2c to transactions on the cable to collide with each other

How Has This Been Tested?
Ran the changes on 7050cx3 arista testbed

Signed-off-by: vaibhav-dahiya <vdahiya@microsoft.com>

Author: vdahiya12

sonic_y_cable/credo/y_cable_credo.py

@@ -695,6 +695,10 @@ def get_active_linked_tor_side(self):
                 TARGET_TOR_B, if TOR B is actively linked and sending traffic.
                 TARGET_UNKNOWN, if checking which side is linked and sending traffic API fails.
         """
+
+        if self.mux_toggle_status == self.MUX_TOGGLE_STATUS_INPROGRESS:
+            return YCableBase.TARGET_UNKNOWN
+
         curr_offset = YCable.OFFSET_ACTIVE_TOR_INDICATOR
 
         if self.platform_chassis is not None:
@@ -756,6 +760,10 @@ def is_link_active(self, target):
             a boolean, True if the link is active
                      , False if the link is not active
         """
+
+        if self.mux_toggle_status == self.MUX_TOGGLE_STATUS_INPROGRESS:
+            return YCableBase.TARGET_UNKNOWN
+
         curr_offset = YCable.OFFSET_CHECK_LINK_ACTIVE
 
         if self.platform_chassis is not None:
@@ -825,6 +833,9 @@ def get_eye_heights(self, target):
             a list, with EYE values of lane 0 lane 1 lane 2 lane 3 with corresponding index
         """
 
+        if self.mux_toggle_status == self.MUX_TOGGLE_STATUS_INPROGRESS:
+            return None
+
         eye_result = []
 
         if self.platform_chassis is not None:
@@ -970,6 +981,9 @@ def get_switch_count_total(self, switch_count_type, clear_on_read=False):
                 an integer, the number of times the Y-cable has been switched
         """
 
+        if self.mux_toggle_status == self.MUX_TOGGLE_STATUS_INPROGRESS:
+            return 0
+
         count = 0
 
         if self.platform_chassis is not None:
@@ -1785,6 +1799,9 @@ def get_local_temperature(self):
             an Integer, the temperature of the local MCU
         """
 
+        if self.mux_toggle_status == self.MUX_TOGGLE_STATUS_INPROGRESS:
+            return 0
+
         curr_offset = YCable.OFFSET_INTERNAL_TEMPERATURE
         if self.platform_chassis is not None:
             with self.rlock.acquire_timeout(RLocker.ACQUIRE_LOCK_TIMEOUT) as lock_status:
@@ -1811,6 +1828,9 @@ def get_nic_voltage(self):
             a float, the voltage of the NIC MCU
         """
 
+        if self.mux_toggle_status == self.MUX_TOGGLE_STATUS_INPROGRESS:
+            return 0
+
         if self.platform_chassis is not None:
             with self.rlock.acquire_timeout(RLocker.ACQUIRE_LOCK_TIMEOUT) as lock_status:
                 if lock_status:
@@ -1838,6 +1858,9 @@ def get_local_voltage(self):
             a float, the voltage of the local MCU
         """
 
+        if self.mux_toggle_status == self.MUX_TOGGLE_STATUS_INPROGRESS:
+            return 0
+
         if self.platform_chassis is not None:
             with self.rlock.acquire_timeout(RLocker.ACQUIRE_LOCK_TIMEOUT) as lock_status:
                 if lock_status:

sonic_y_cable/y_cable_base.py

@@ -78,6 +78,15 @@ class YCableBase():
     FIRMWARE_DOWNLOAD_STATUS_FAILED = 2
 
 
+    # Valid status values for mux togge
+    # The mux_toggle_status variable should be assigned/used
+    # one of these predefined values inside toggle/telemetry routine
+    # as to signify what is the current status of toggle in progress
+
+    MUX_TOGGLE_STATUS_NOT_INITIATED_OR_FINISHED = 0
+    MUX_TOGGLE_STATUS_INPROGRESS = 1
+
+
     # definitions of PRBS run modes
     PRBS_DIRECTION_BOTH = 0
     PRBS_DIRECTION_GENERATOR = 1
@@ -96,6 +105,7 @@ def __init__(self, port, logger):
         self.port = port
         self._logger = logger
         self.download_firmware_status = self.FIRMWARE_DOWNLOAD_STATUS_NOT_INITIATED_OR_FINISHED
+        self.mux_toggle_status = self.MUX_TOGGLE_STATUS_NOT_INITIATED_OR_FINISHED
 
 
     def log_warning(self, msg):