netdev - [PATCH net-next v1 02/12] tools/net/ynl: Support sub-messages in nested attribute spaces

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Date: Tue, 23 Jan 2024 16:05:28 +0000
From: Donald Hunter <donald.hunter@...il.com>
To: netdev@...r.kernel.org,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	linux-doc@...r.kernel.org,
	Jacob Keller <jacob.e.keller@...el.com>,
	Breno Leitao <leitao@...ian.org>,
	Jiri Pirko <jiri@...nulli.us>,
	Alessandro Marcolini <alessandromarcolini99@...il.com>
Cc: donald.hunter@...hat.com,
	Donald Hunter <donald.hunter@...il.com>
Subject: [PATCH net-next v1 02/12] tools/net/ynl: Support sub-messages in nested attribute spaces

Sub-message selectors could only be resolved using values from the
current nest level. Enable value lookup in outer scopes by using
collections.ChainMap to implement an ordered lookup from nested to
outer scopes.

Signed-off-by: Donald Hunter <donald.hunter@...il.com>
---
 tools/net/ynl/lib/ynl.py | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index 1e10512b2117..b00cde5d29e5 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 
-from collections import namedtuple
+from collections import namedtuple, ChainMap
 import functools
 import os
 import random
@@ -564,8 +564,8 @@ class YnlFamily(SpecFamily):
         spec = sub_msg_spec.formats[value]
         return spec
 
-    def _decode_sub_msg(self, attr, attr_spec, rsp):
-        msg_format = self._resolve_selector(attr_spec, rsp)
+    def _decode_sub_msg(self, attr, attr_spec, vals):
+        msg_format = self._resolve_selector(attr_spec, vals)
         decoded = {}
         offset = 0
         if msg_format.fixed_header:
@@ -579,10 +579,11 @@ class YnlFamily(SpecFamily):
                 raise Exception(f"Unknown attribute-set '{attr_space}' when decoding '{attr_spec.name}'")
         return decoded
 
-    def _decode(self, attrs, space):
+    def _decode(self, attrs, space, outer_vals = ChainMap()):
         if space:
             attr_space = self.attr_sets[space]
         rsp = dict()
+        vals = ChainMap(rsp, outer_vals)
         for attr in attrs:
             try:
                 attr_spec = attr_space.attrs_by_val[attr.type]
@@ -594,7 +595,7 @@ class YnlFamily(SpecFamily):
                 continue
 
             if attr_spec["type"] == 'nest':
-                subdict = self._decode(NlAttrs(attr.raw), attr_spec['nested-attributes'])
+                subdict = self._decode(NlAttrs(attr.raw), attr_spec['nested-attributes'], vals)
                 decoded = subdict
             elif attr_spec["type"] == 'string':
                 decoded = attr.as_strz()
@@ -617,7 +618,7 @@ class YnlFamily(SpecFamily):
                     selector = self._decode_enum(selector, attr_spec)
                 decoded = {"value": value, "selector": selector}
             elif attr_spec["type"] == 'sub-message':
-                decoded = self._decode_sub_msg(attr, attr_spec, rsp)
+                decoded = self._decode_sub_msg(attr, attr_spec, vals)
             else:
                 if not self.process_unknown:
                     raise Exception(f'Unknown {attr_spec["type"]} with name {attr_spec["name"]}')
-- 
2.42.0