[docker-lldp]: fix several issues in lldpd docker

dockers/docker-lldp-sv2/lldpd.conf.j2

@@ -9,3 +9,4 @@ configure ports eth0 lldp portidsubtype local {{ mgmt_port_name }}
 {% endif %}
 configure system ip management pattern {{ ipv4 }}
 {% endif %}
+configure system hostname {{ DEVICE_METADATA['localhost']['hostname'] }}

dockers/docker-lldp-sv2/lldpmgrd

@@ -73,17 +73,12 @@ def signal_handler(sig, frame):
 
 # ========================== Helpers ==================================
 
-def is_port_up(port_name):
-    filename = "/sys/class/net/%s/operstate" % port_name
+def is_port_exist(port_name):
+    filename = "/sys/class/net/%s/ifindex" % port_name
     if not os.path.exists(filename):
         return False
 
-    with open(filename) as fp:
-        state = fp.read()
-        if 'up' in state:
-            return True
-        else:
-            return False
+    return True
 
 # ============================== Classes ==============================
 
@@ -159,8 +154,8 @@ class LldpManager(object):
         to_delete = []
 
         for (port_name, cmd) in self.pending_cmds.iteritems():
-            if not is_port_up(port_name):
-                # it doesn't make any sense to configure lldpd if the target port is unavailable
+            if not is_port_exist(port_name):
+                # it doesn't make any sense to configure lldpd if the target port does not exist
                 # let's postpone the command for the next iteration
                 continue
 

dockers/docker-lldp-sv2/start.sh

@@ -10,8 +10,6 @@ rm -f /var/run/lldpd.socket
 
 supervisorctl start rsyslogd
 supervisorctl start lldpd
-supervisorctl start lldp-syncd
-supervisorctl start lldpmgrd
 
 # Current lldpd version has a bug.
 # When lldpd starts it is in the pause state by default
@@ -35,3 +33,6 @@ do
     lldpcli -u /var/run/lldpd.socket -c /etc/lldpd.conf -c /etc/lldpd.d resume > /dev/null && break
     sleep 1
 done
+
+supervisorctl start lldp-syncd
+supervisorctl start lldpmgrd

src/sonic-config-engine/minigraph.py

@@ -538,10 +538,14 @@ def parse_xml(filename, platform=None, port_config_file=None):
 
         ports.setdefault(port_name, {})['description'] = port_descriptions[port_name]
 
-    # for the ports w/o description set it to alias, or port name
     for port_name, port in ports.items():
         if not port.get('description'):
-            port['description'] = port.get('alias', port_name)
+            if neighbors.has_key(port_name):
+                # for the ports w/o description set it to neighbor name:port
+                port['description'] = "%s:%s" % (neighbors[port_name]['name'], neighbors[port_name]['port'])
+            else:
+                # for the ports w/o neighbor info, set it to port alias
+                port['description'] = port.get('alias', port_name)
 
     # set default port MTU as 9100
     for port in ports.itervalues():

src/sonic-config-engine/tests/sample_output/lldpd.conf

@@ -1,3 +1,3 @@
 configure ports eth0 lldp portidsubtype local eth0
 configure system ip management pattern 10.0.0.100
-
+configure system hostname switch-t0

src/sonic-config-engine/tests/test_cfggen.py

@@ -151,6 +151,11 @@ def test_minigraph_extra_neighbors(self):
                 "'Ethernet112': {'name': 'ARISTA01T1', 'port': 'Ethernet1/1'}, "
                 "'Ethernet120': {'name': 'ARISTA03T1', 'port': 'Ethernet1/1'}}")
 
+    def test_minigraph_port_description(self):
+        argument = '-m "' + self.sample_graph_t0 + '" -p "' + self.port_config + '" -v "PORT[\'Ethernet124\']"'
+        output = self.run_script(argument)
+        self.assertEqual(output.strip(), "{'alias': 'fortyGigE0/124', 'admin_status': 'up', 'lanes': '101,102,103,104', 'description': 'ARISTA04T1:Ethernet1/1', 'mtu': '9100'}")
+
     def test_minigraph_bgp(self):
         argument = '-m "' + self.sample_graph_bgp_speaker + '" -p "' + self.port_config + '" -v "BGP_NEIGHBOR[\'10.0.0.59\']"'
         output = self.run_script(argument)