[chassis][mutli-asic][lldp] "show lldp table/neighbors" displays erro…

…r message in output on multi-asis linecard. (sonic-net#3358)

Modify the lldpshow script to fix the output of the "show lldp table" and "show lldp neighbors" on the multi-asic Linecard. Fixes sonic-net/sonic-buildimage#19209

* [mutli-asic][lldp] "show lldp table" displays error message in output on multi-asic linecard

* Added code coverage UT

Signed-off-by: mlok <[email protected]>

scripts/lldpshow

@@ -26,8 +26,9 @@ import sys
 from lxml import etree as ET
 
 from sonic_py_common import device_info
+from utilities_common import constants
 from swsscommon.swsscommon import ConfigDBConnector
-from utilities_common.general import load_db_config
+from utilities_common.general import load_db_config, get_feature_state_data
 from tabulate import tabulate
 
 BACKEND_ASIC_INTERFACE_NAME_PREFIX = 'Ethernet-BP'
@@ -69,8 +70,12 @@ class Lldpshow(object):
                 self.lldp_interface[instance_num] += key + SPACE_TOKEN
 
         # LLDP running in host namespace
-        self.lldp_instance.append(LLDP_INSTANCE_IN_HOST_NAMESPACE)
-        self.lldp_interface.append(LLDP_INTERFACE_LIST_IN_HOST_NAMESPACE)
+        config_db = ConfigDBConnector(use_unix_socket_path=True, namespace=constants.DEFAULT_NAMESPACE)
+        config_db.connect()
+        global_scope, asic_scope = get_feature_state_data(config_db, "lldp")
+        if global_scope == "True":
+            self.lldp_instance.append(LLDP_INSTANCE_IN_HOST_NAMESPACE)
+            self.lldp_interface.append(LLDP_INTERFACE_LIST_IN_HOST_NAMESPACE)
 
     def get_info(self, lldp_detail_info, lldp_port):
         """
@@ -85,7 +90,7 @@ class Lldpshow(object):
             elif lldp_interface_list == '':
                 lldp_args = []
             else:
-                lldp_args = [lldp_interface_list]
+                lldp_args = lldp_interface_list.split(' ')
             lldp_cmd = ['sudo', 'docker', 'exec', '-i', 'lldp{}'.format(self.lldp_instance[lldp_instace_num]), 'lldpctl'] + lldp_args
             p = subprocess.Popen(lldp_cmd, stdout=subprocess.PIPE, text=True)
             (output, err) = p.communicate()

tests/lldp_test.py

@@ -2,6 +2,7 @@
 
 from click.testing import CliRunner
 from utilities_common.general import load_module_from_source
+from importlib import reload
 
 test_path = os.path.dirname(os.path.abspath(__file__))
 modules_path = os.path.dirname(test_path)
@@ -83,6 +84,22 @@ def test_get_info(self):
         output = lldp.get_summary_output(lldp_detail_info=True)
         assert output.strip('\n') == expected_lldpctl_xml_output[0].strip('\n')
 
+    def test_get_info_multi_asic(self):
+        from .mock_tables import mock_multi_asic
+        from .mock_tables import dbconnector
+        reload(mock_multi_asic)
+        dbconnector.load_namespace_config()
+        lldp = lldpshow.Lldpshow()
+        from .mock_tables import mock_single_asic
+        reload(mock_single_asic)
+        dbconnector.load_namespace_config()
+        lldp.lldp_instance = ['']
+        lldp.lldpraw = expected_lldpctl_xml_output
+        lldp.get_info(lldp_detail_info=True, lldp_port='Ethernet0')
+        lldp.parse_info(lldp_detail_info=True)
+        output = lldp.get_summary_output(lldp_detail_info=True)
+        assert output.strip('\n') == expected_lldpctl_xml_output[0].strip('\n')
+
     @classmethod
     def teardown_class(cls):
         print("TEARDOWN")

tests/mock_tables/config_db.json

@@ -848,6 +848,8 @@
     "FEATURE|lldp": {
         "state": "enabled",
         "auto_restart": "enabled",
+        "has_global_scope": "False",
+        "has_per_asic_scope": "True",
         "high_mem_alert": "disabled",
         "set_owner": "kube"
     },

utilities_common/general.py

@@ -2,8 +2,11 @@
 import importlib.util
 import sys
 
-from sonic_py_common.multi_asic import is_multi_asic
+from sonic_py_common import multi_asic
 from swsscommon import swsscommon
+FEATURE_TABLE = "FEATURE"
+FEATURE_HAS_PER_ASIC_SCOPE = 'has_per_asic_scope'
+FEATURE_HAS_GLOBAL_SCOPE = 'has_global_scope'
 
 def load_module_from_source(module_name, file_path):
     """
@@ -25,7 +28,7 @@ def load_db_config():
      - database_global.json for multi asic
      - database_config.json for single asic
     '''
-    if is_multi_asic():
+    if multi_asic.is_multi_asic():
         if not swsscommon.SonicDBConfig.isGlobalInit():
             swsscommon.SonicDBConfig.load_sonic_global_db_config()
     else:
@@ -39,6 +42,28 @@ def get_optional_value_for_key_in_config_tbl(config_db, port, key, table):
         return None
 
     value = info_dict.get(key, None)
-
     return value
 
+
+def get_feature_state_data(config_db, feature):
+    '''
+    Get feature state from FEATURE table from CONFIG_DB.
+    return  global_scope, per_asic_scope
+    - if feature state is disabled, return "False" for both global_scope and per_asic_scope
+    - if is not a multi-asic, return feature state for global_scope ("True/False") and
+      "False" for asic_scope
+    '''
+    global_scope = "False"
+    asic_scope = "False"
+    info_dict = {}
+    info_dict = config_db.get_entry(FEATURE_TABLE, feature)
+    if info_dict is None:
+        return global_scope, asic_scope
+    if multi_asic.is_multi_asic():
+        if info_dict['state'].lower() == "enabled":
+            global_scope = info_dict[FEATURE_HAS_GLOBAL_SCOPE]
+            asic_scope = info_dict[FEATURE_HAS_PER_ASIC_SCOPE]
+    else:
+        if info_dict['state'].lower() == "enabled":
+            global_scope = "True"
+    return global_scope, asic_scope