Added get_system_mac support for cisco-8000 device (#9104)

Added get_system_mac support for cisco-8000 device

Why I did it
This is required to assign unique MACs to namespaces on Backend and Frontend asics
for cisco-8000 platforms

How I did it
Add vendor specific hook in get_system_mac. The MAC address are read from /profile.ini
file

How to verify it
config load_minigraph on a multi-asic system
config save
check mac addresses in DEVICE_METADATA section in each config_db json file

src/sonic-config-engine/minigraph.py

@@ -1753,6 +1753,15 @@ def parse_asic_sub_role(filename, asic_name):
             sub_role, _, _, _ = parse_asic_meta(child, asic_name)
             return sub_role
 
+def parse_asic_switch_type(filename, asic_name):
+    if os.path.isfile(filename):
+        root = ET.parse(filename).getroot()
+        for child in root:
+            if child.tag == str(QName(ns, "MetadataDeclaration")):
+                _, _, switch_type, _ = parse_asic_meta(child, asic_name)
+                return switch_type
+    return None
+
 def parse_asic_meta_get_devices(root):
     local_devices = []
 

src/sonic-config-engine/sonic-cfggen

@@ -29,7 +29,7 @@ import yaml
 from collections import OrderedDict
 from config_samples import generate_sample_config, get_available_config
 from functools import partial
-from minigraph import minigraph_encoder, parse_xml, parse_device_desc_xml, parse_asic_sub_role
+from minigraph import minigraph_encoder, parse_xml, parse_device_desc_xml, parse_asic_sub_role, parse_asic_switch_type
 from portconfig import get_port_config, get_breakout_mode
 from redis_bcc import RedisBytecodeCache
 from sonic_py_common.multi_asic import get_asic_id_from_name, get_asic_device_id
@@ -363,13 +363,17 @@ def main():
 
 
     # the minigraph file must be provided to get the mac address for backend asics
+    # or switch_type chassis_packet
     if args.platform_info:
         asic_role = None
+        switch_type = None
         if asic_name is not None:
             if args.minigraph is not None:
                 asic_role = parse_asic_sub_role(args.minigraph, asic_name)
+                switch_type = parse_asic_switch_type(args.minigraph, asic_name)
 
-            if asic_role is not None and asic_role.lower() == "backend":
+            if ((switch_type is not None and switch_type.lower() == "chassis-packet") or
+                (asic_role is not None and asic_role.lower() == "backend")):
                 mac = device_info.get_system_mac(namespace=asic_name)
             else:
                 mac = device_info.get_system_mac()

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

@@ -492,6 +492,14 @@ def get_system_mac(namespace=None):
         else:
             profile_cmd = "false"
         hw_mac_entry_cmds = ["sudo decode-syseeprom -m", profile_cmd, "ip link show eth0 | grep ether | awk '{print $2}'"]
+    elif (version_info['asic_type'] == 'cisco-8000'):
+        # Try to get valid MAC from profile.ini first, else fetch it from syseeprom or eth0
+        platform = get_platform()
+        if namespace is not None:
+            profile_cmd = 'cat ' + HOST_DEVICE_PATH + '/' + platform + '/profile.ini | grep ' + namespace + 'switchMacAddress | cut -f2 -d='
+        else:
+            profile_cmd = "false"
+        hw_mac_entry_cmds = [profile_cmd, "sudo decode-syseeprom -m", "ip link show eth0 | grep ether | awk '{print $2}'"]
     else:
         mac_address_cmd = "cat /sys/class/net/eth0/address"
         if namespace is not None: