[Credo][Ycable] changes for synchronizing executing Telemetry API's w…

…hen 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>

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):