[xcvrd] Change the y_cable presence logic to use "mux_cable" table as identifier from Config DB (#176)

* [xcvrd] Change the y_cable presence logic to use "mux_cable" table as
identfier from Config DB

This PR changes the logic to use "mux_cable" table as identifier, and only those ports which have this table inside config DB and key pair of "state:auto/active" will be processed as having a Y-Cable port.
The earlier logic was using the PORT table tag with a mux_cable:true key-value pair.

Description
change the logic to initiate Y-Cable logic

Motivation and Context
Required for changing the logic, so that this can be integrated with images which don't support "mux_cable" tag inside config DB

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

Author: vdahiya12

sonic-xcvrd/xcvrd/xcvrd_utilities/y_cable_helper.py

@@ -282,9 +282,9 @@ def check_identifier_presence_and_update_mux_table_entry(state_db, port_tbl, y_c
     else:
         # Convert list of tuples to a dictionary
         mux_table_dict = dict(fvs)
-        if "mux_cable" in mux_table_dict:
-            val = mux_table_dict.get("mux_cable", None)
-            if val == "true":
+        if "state" in mux_table_dict:
+            val = mux_table_dict.get("state", None)
+            if val in ["active", "auto"]:
 
                 y_cable_asic_table = y_cable_tbl.get(asic_index, None)
                 mux_asic_table = mux_tbl.get(asic_index, None)
@@ -314,6 +314,9 @@ def check_identifier_presence_and_update_mux_table_entry(state_db, port_tbl, y_c
                         logical_port_name, y_cable_tbl[asic_index])
                     post_port_mux_info_to_db(logical_port_name,  mux_tbl[asic_index])
                     post_port_mux_static_info_to_db(logical_port_name,  static_tbl[asic_index])
+            else:
+                helper_logger.log_warning(
+                    "Could not retreive active or auto value for state kvp for {}, inside MUX_CABLE table".format(logical_port_name))
 
 
 def check_identifier_presence_and_delete_mux_table_entry(state_db, port_tbl, asic_index, logical_port_name, y_cable_presence, delete_change_event):
@@ -373,7 +376,7 @@ def init_ports_status_for_y_cable(platform_sfp, platform_chassis, y_cable_presen
     for namespace in namespaces:
         asic_id = multi_asic.get_asic_index_from_namespace(namespace)
         config_db[asic_id] = daemon_base.db_connect("CONFIG_DB", namespace)
-        port_tbl[asic_id] = swsscommon.Table(config_db[asic_id], "PORT")
+        port_tbl[asic_id] = swsscommon.Table(config_db[asic_id], "MUX_CABLE")
         port_table_keys[asic_id] = port_tbl[asic_id].getKeys()
 
     # Init PORT_STATUS table if ports are on Y cable
@@ -414,7 +417,7 @@ def change_ports_status_for_y_cable_change_event(port_dict, y_cable_presence, st
     for namespace in namespaces:
         asic_id = multi_asic.get_asic_index_from_namespace(namespace)
         config_db[asic_id] = daemon_base.db_connect("CONFIG_DB", namespace)
-        port_tbl[asic_id] = swsscommon.Table(config_db[asic_id], "PORT")
+        port_tbl[asic_id] = swsscommon.Table(config_db[asic_id], "MUX_CABLE")
         port_table_keys[asic_id] = port_tbl[asic_id].getKeys()
 
     # Init PORT_STATUS table if ports are on Y cable and an event is received
@@ -518,9 +521,9 @@ def check_identifier_presence_and_update_mux_info_entry(state_db, mux_tbl, asic_
     else:
         # Convert list of tuples to a dictionary
         mux_table_dict = dict(fvs)
-        if "mux_cable" in mux_table_dict:
-            val = mux_table_dict.get("mux_cable", None)
-            if val == "true":
+        if "state" in mux_table_dict:
+            val = mux_table_dict.get("state", None)
+            if val in ["active", "auto"]:
 
                 if mux_tbl.get(asic_index, None) is not None:
                     # fill in the newly found entry
@@ -535,6 +538,9 @@ def check_identifier_presence_and_update_mux_info_entry(state_db, mux_tbl, asic_
                         mux_tbl[asic_id] = swsscommon.Table(state_db[asic_id], MUX_CABLE_INFO_TABLE)
                     # fill the newly found entry
                     post_port_mux_info_to_db(logical_port_name,  mux_tbl[asic_index])
+            else:
+                helper_logger.log_warning(
+                    "Could not retreive active or auto value for state kvp for {}, inside MUX_CABLE table".format(logical_port_name))
 
 
 def get_firmware_dict(physical_port, target, side, mux_info_dict):