X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=resources%2Flibraries%2Fpython%2FInterfaceUtil.py;h=7e645d1f5fd2462bdd19ae0de32e22fc15e0e466;hb=6e862ec7b63e177b9b0103612848b3377271729b;hp=24a65e86a97c25b878042ef83509b45abdd0a353;hpb=ec194ef8ecfa656b9b1d5056b49dd3877d1268e1;p=csit.git

diff --git a/resources/libraries/python/InterfaceUtil.py b/resources/libraries/python/InterfaceUtil.py
index 24a65e86a9..7e645d1f5f 100644
--- a/resources/libraries/python/InterfaceUtil.py
+++ b/resources/libraries/python/InterfaceUtil.py
@@ -347,32 +347,28 @@ class InterfaceUtil:
             exec_cmd_no_error(node, cmd, sudo=True)
 
     @staticmethod
-    def vpp_set_interface_mtu(node, interface, mtu=9200):
-        """Set Ethernet MTU on interface.
+    def vpp_set_interface_mtu(node, interface, mtu):
+        """Apply new MTU value to a VPP hardware interface.
+
+        The interface should be down when this is called.
 
         :param node: VPP node.
-        :param interface: Interface to setup MTU. Default: 9200.
+        :param interface: Interface to set MTU on.
         :param mtu: Ethernet MTU size in Bytes.
         :type node: dict
         :type interface: str or int
         :type mtu: int
+        :raises AsserionError: If VPP refused to change the MTU or set if state.
         """
         if isinstance(interface, str):
             sw_if_index = Topology.get_interface_sw_index(node, interface)
         else:
             sw_if_index = interface
-
         cmd = u"hw_interface_set_mtu"
         err_msg = f"Failed to set interface MTU on host {node[u'host']}"
-        args = dict(
-            sw_if_index=sw_if_index,
-            mtu=int(mtu)
-        )
-        try:
-            with PapiSocketExecutor(node) as papi_exec:
-                papi_exec.add(cmd, **args).get_reply(err_msg)
-        except AssertionError as err:
-            logger.debug(f"Setting MTU failed.\n{err}")
+        args = dict(sw_if_index=sw_if_index, mtu=int(mtu))
+        with PapiSocketExecutor(node) as papi_exec:
+            papi_exec.add(cmd, **args).get_reply(err_msg)
 
     @staticmethod
     def vpp_node_interfaces_ready_wait(node, retries=15):
@@ -1994,7 +1990,7 @@ class InterfaceUtil:
         thread_data = VPPUtil.vpp_show_threads(node)
         worker_cnt = len(thread_data) - 1
         if not worker_cnt:
-            return None
+            return
         worker_ids = list()
         if workers:
             for item in thread_data: