[voq/inbandif] Support for inband port as regular port (sonic-net#6477)

Changes in this PR are to make LLDP to consider Inband port and to avoid regular
port handling on Inband port.

dockers/docker-lldp/lldpmgrd

@@ -22,6 +22,7 @@ try:
 
     from sonic_py_common import daemon_base
     from swsscommon import swsscommon
+    from sonic_py_common.interface import inband_prefix
 except ImportError as err:
     raise ImportError("%s - required module not found" % str(err))
 
@@ -94,6 +95,11 @@ class LldpManager(daemon_base.DaemonBase):
         """
         port_desc = None
 
+        # Skip inband interface prefixes. These are recycle ports exposed in PORT_TABLE for
+        # asic-to-asic communication in VOQ based chassis system. We do not configure LLDP on these.
+        if port_name.startswith(inband_prefix()):
+            return
+
         # Retrieve all entires for this port from the Port table
         port_table = swsscommon.Table(self.config_db, swsscommon.CFG_PORT_TABLE_NAME)
         (status, fvp) = port_table.get(port_name)

platform/vs/docker-sonic-vs/start.sh

@@ -90,6 +90,16 @@ fi
 if [ "$conn_chassis_db" == "1" ]; then
    if [ -f /usr/share/sonic/virtual_chassis/coreportindexmap.ini ]; then
       cp /usr/share/sonic/virtual_chassis/coreportindexmap.ini /usr/share/sonic/hwsku/
+
+      pushd /usr/share/sonic/hwsku
+
+      # filter available front panel ports in coreportindexmap.ini
+      [ -f coreportindexmap.ini.orig ] || cp coreportindexmap.ini coreportindexmap.ini.orig
+      for p in $(ip link show | grep -oE "eth[0-9]+" | grep -v eth0); do
+          grep ^$p: coreportindexmap.ini.orig
+      done > coreportindexmap.ini
+
+      popd
    fi
 fi
 

src/sonic-py-common/sonic_py_common/interface.py

@@ -13,7 +13,8 @@
     "PortChannel": "PortChannel",
     "Vlan": "Vlan",
     "Loopback": "Loopback",
-    "Ethernet-Backplane": "Ethernet-BP"
+    "Ethernet-Backplane": "Ethernet-BP",
+    "Ethernet-Inband": "Ethernet-IB"
 }
 
 VLAN_SUB_INTERFACE_SEPARATOR = '.'
@@ -48,6 +49,12 @@ def loopback_prefix():
     """
     return SONIC_INTERFACE_PREFIXES["Loopback"]
 
+def inband_prefix():
+    """
+    Retrieves the SONIC recycle port inband interface name prefix.
+    """
+    return SONIC_INTERFACE_PREFIXES["Ethernet-Inband"]
+
 def get_interface_table_name(interface_name):
     """Get table name by interface_name prefix
     """