Obtain management port speed from system file

src/sonic_ax_impl/mibs/ietf/rfc2863.py

@@ -289,6 +289,15 @@ def _get_if_entry(self, oid):
 
         return Namespace.dbs_get_all(self.db_conn, db, if_table, blocking=True)
 
+    def _get_mgmt_speed(self, oid):
+        interface = self.mgmt_oid_name_map[oid]
+        try:
+            with open(f'/sys/class/net/{interface}/speed', 'r') as f:
+                speed = int(f.read().strip())
+                return speed
+        except:
+            return 0
+
     def get_high_speed(self, sub_id):
         """
         :param sub_id: The 1-based sub-identifier query.
@@ -298,6 +307,9 @@ def get_high_speed(self, sub_id):
         if not oid:
             return
 
+        if oid in self.mgmt_oid_name_map:
+            return self._get_mgmt_speed(oid)
+
         if oid in self.oid_lag_name_map:
             speed = 0
             for lag_member in self.lag_name_if_name_map[self.oid_lag_name_map[oid]]:

tests/namespace/test_hc_interfaces.py

@@ -9,6 +9,7 @@
 sys.path.insert(0, os.path.join(modules_path, 'src'))
 
 from unittest import TestCase
+from unittest.mock import patch, mock_open
 
 from ax_interface import ValueType
 from ax_interface.pdu import PDU
@@ -222,7 +223,8 @@ def test_mgmt_iface_alias(self):
         self.assertEqual(str(value0.name), str(ObjectIdentifier(11, 0, 1, 0, (1, 3, 6, 1, 2, 1, 31, 1, 1, 1, 1, 10001))))
         self.assertEqual(str(value0.data), 'mgmt1')
 
-    def test_mgmt_iface_speed(self):
+    @patch("builtins.open", new_callable=mock_open, read_data="1000\n")
+    def test_mgmt_iface_speed(self, mock_file):
         """
         Test that mgmt port speed is 1000
         """

tests/test_hc_interfaces.py

@@ -9,6 +9,7 @@
 sys.path.insert(0, os.path.join(modules_path, 'src'))
 
 from unittest import TestCase
+from unittest.mock import patch, mock_open
 
 from ax_interface import ValueType
 from ax_interface.pdu import PDU
@@ -225,7 +226,8 @@ def test_mgmt_iface_alias(self):
         self.assertEqual(str(value0.name), str(ObjectIdentifier(11, 0, 1, 0, (1, 3, 6, 1, 2, 1, 31, 1, 1, 1, 1, 10001))))
         self.assertEqual(str(value0.data), 'mgmt1')
 
-    def test_mgmt_iface_speed(self):
+    @patch("builtins.open", new_callable=mock_open, read_data="1000\n")
+    def test_mgmt_iface_speed(self, mock_file):
         """
         Test that mgmt port speed is 1000
         """