Updates to move the function get_asic_device_id() into the sonic-py-common. (#5204)

Update the name from get_npu_device_id() -to get_asic_device_id() and move from device_info.py, to the new file multi_asic.py in sonic-py-common so that it references to the correct valid constants.

src/sonic-config-engine/sonic-cfggen

@@ -42,8 +42,7 @@ from minigraph import parse_device_desc_xml
 from minigraph import parse_asic_sub_role
 from portconfig import get_port_config
 from sonic_py_common.device_info import get_platform, get_system_mac
-from sonic_py_common.device_info import get_npu_device_id
-from sonic_py_common.multi_asic import get_asic_id_from_name, is_multi_asic
+from sonic_py_common.multi_asic import get_asic_id_from_name, is_multi_asic, get_asic_device_id
 from config_samples import generate_sample_config
 from config_samples import get_available_config
 from swsssdk import SonicV2Connector, ConfigDBConnector, SonicDBConfig 
@@ -315,7 +314,7 @@ def main():
             }}}
         # The ID needs to be passed to the SAI to identify the asic.
         if asic_name is not None:
-            device_id = get_npu_device_id(asic_id)
+            device_id = get_asic_device_id(asic_id)
             # if the device_id obtained is None, exit with error
             if device_id is None:
                 print('Failed to get device ID for', asic_name, file=sys.stderr)

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

@@ -129,6 +129,34 @@ def get_asic_id_from_name(asic_name):
     else:
         return None
 
+# Get the ASIC id from the asic.conf file.
+def get_asic_device_id(asic_id):
+    platform = get_platform()
+    if not platform:
+        return None
+
+    asic_conf_file_path = get_asic_conf_file_path()
+
+    if asic_conf_file_path is None:
+        return None
+
+    # In a multi-asic device we need to have the file "asic.conf" updated with the asic instance
+    # and the corresponding device id which could be pci_id. Below is an eg: for a 2 ASIC platform/sku.
+    # DEV_ID_ASIC_0=03:00.0
+    # DEV_ID_ASIC_1=04:00.0
+    device_str = "DEV_ID_ASIC_{}".format(asic_id)
+
+    with open(asic_conf_file_path) as asic_conf_file:
+        for line in asic_conf_file:
+            tokens = line.split('=')
+            if len(tokens) < 2:
+               continue
+            if tokens[0] == device_str:
+                device_id = tokens[1].strip()
+                return device_id
+
+    return None
+
 
 def get_namespaces_from_linux():
     """
@@ -297,4 +325,4 @@ def is_bgp_session_internal(bgp_neigh_ip, namespace=None):
             return True
         else:
             return False
-    return False
+    return False