python: Include aliases in ofp_fields.py.

We currently auto-generate a dictionary of field names and decoders.
However, sometimes fields can be specified by their cannonical NXM or
OXM names.

Modify gen_ofp_field_decoders to also generate a dictionary of aliases
so it's easy to map OXM/NXM names to their fields and decoding
information.

Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Acked-by: Mike Pattrick <mkp@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/build-aux/gen_ofp_field_decoders b/build-aux/gen_ofp_field_decoders
index 96f99e860..0b797ee8c 100755
--- a/build-aux/gen_ofp_field_decoders
+++ b/build-aux/gen_ofp_field_decoders
@@ -22,12 +22,16 @@ def main():
     fields = extract_fields.extract_ofp_fields(args.metaflow)
 
     field_decoders = {}
+    aliases = {}
     for field in fields:
         decoder = get_decoder(field)
         field_decoders[field.get("name")] = decoder
         if field.get("extra_name"):
             field_decoders[field.get("extra_name")] = decoder
 
+        for nxm in field.get("OXM", []):
+            aliases[nxm[1]] = field.get("name")
+
     code = """
 # This file is auto-generated. Do not edit!
 
@@ -35,14 +39,25 @@ from ovs.flow import decoders
 
 field_decoders = {{
 {decoders}
+}}
+
+field_aliases = {{
+{aliases}
 }}""".format(
         decoders="\n".join(
             [
                 "    '{name}': {decoder},".format(name=name, decoder=decoder)
                 for name, decoder in field_decoders.items()
             ]
+        ),
+        aliases="\n".join(
+            [
+                "    '{alias}': '{name}',".format(name=name, alias=alias)
+                for alias, name in aliases.items()
+            ]
         )
     )
+
     print(code)