packetforge: add option to show spec and mask only

In some cases with Generic FLow, it is only required to show the pattern
of spec and mask, but no need to add the flow. Therefore, add an option
in packetforge so that users can show spec and mask only.

Type: improvement

Signed-off-by: Ting Xu <ting.xu@intel.com>
Change-Id: I7b3040689eb82d0b58924712ee6fc9cfa0a42fa1

extras/packetforge/packetforge.py

@@ -21,7 +21,7 @@ import os
 parsegraph_path = os.getcwd() + "/parsegraph"
 
 
-def Forge(pattern, actions, file_flag):
+def Forge(pattern, actions, file_flag, show_result_only):
     pg = ParseGraph.Create(parsegraph_path)
     if pg == None:
         print("error: create parsegraph failed")
@@ -54,7 +54,6 @@ def Forge(pattern, actions, file_flag):
 
     # create generic flow
     my_flow = {
-        "type": VppEnum.vl_api_flow_type_v2_t.FLOW_TYPE_GENERIC_V2,
         "flow": {
             "generic": {
                 "pattern": {"spec": bytes(spec.encode()), "mask": bytes(mask.encode())}
@@ -62,6 +61,15 @@ def Forge(pattern, actions, file_flag):
         },
     }
 
+    if show_result_only:
+        return my_flow
+
+    my_flow.update(
+        {
+            "type": VppEnum.vl_api_flow_type_v2_t.FLOW_TYPE_GENERIC_V2,
+        }
+    )
+
     # update actions entry
     my_flow = GetAction(actions, my_flow)