Merge tag 'docs/v6.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-docs

Mauro Carvalho Chehab says:

====================
add a generic yaml parser integrated with Netlink specs generation

- An YAML parser Sphinx plugin, integrated with Netlink YAML doc
  parser.

The patch content is identical to my v10 submission:
https://lore.kernel.org/cover.1753718185.git.mchehab+huawei@kernel.org

* tag 'docs/v6.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-docs:
  sphinx: parser_yaml.py: fix line numbers information
  docs: parser_yaml.py: fix backward compatibility with old docutils
  docs: parser_yaml.py: add support for line numbers from the parser
  tools: netlink_yml_parser.py: add line numbers to parsed data
  MAINTAINERS: add netlink_yml_parser.py to linux-doc
  docs: netlink: remove obsolete .gitignore from unused directory
  tools: ynl_gen_rst.py: drop support for generating index files
  docs: uapi: netlink: update netlink specs link
  docs: use parser_yaml extension to handle Netlink specs
  docs: sphinx: add a parser for yaml files for Netlink specs
  tools: ynl_gen_rst.py: cleanup coding style
  docs: netlink: index.rst: add a netlink index file
  tools: ynl_gen_rst.py: Split library from command line tool
  docs: netlink: netlink-raw.rst: use :ref: instead of :doc:
====================

Link: https://patch.msgid.link/20250812113329.356c93c2@foz.lan
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

10 files changed, 157 insertions, 33 deletions

diff --git a/Documentation/Makefile b/Documentation/Makefile
index b98477df5ddf..820f07e0afe6 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -104,22 +104,6 @@ quiet_cmd_sphinx = SPHINX  $@ --> file://$(abspath $(BUILDDIR)/$3/$4)
 		cp $(if $(patsubst /%,,$(DOCS_CSS)),$(abspath $(srctree)/$(DOCS_CSS)),$(DOCS_CSS)) $(BUILDDIR)/$3/_static/; \
 	fi
 
-YNL_INDEX:=$(srctree)/Documentation/networking/netlink_spec/index.rst
-YNL_RST_DIR:=$(srctree)/Documentation/networking/netlink_spec
-YNL_YAML_DIR:=$(srctree)/Documentation/netlink/specs
-YNL_TOOL:=$(srctree)/tools/net/ynl/pyynl/ynl_gen_rst.py
-
-YNL_RST_FILES_TMP := $(patsubst %.yaml,%.rst,$(wildcard $(YNL_YAML_DIR)/*.yaml))
-YNL_RST_FILES := $(patsubst $(YNL_YAML_DIR)%,$(YNL_RST_DIR)%, $(YNL_RST_FILES_TMP))
-
-$(YNL_INDEX): $(YNL_RST_FILES)
-	$(Q)$(YNL_TOOL) -o $@ -x
-
-$(YNL_RST_DIR)/%.rst: $(YNL_YAML_DIR)/%.yaml $(YNL_TOOL)
-	$(Q)$(YNL_TOOL) -i $< -o $@
-
-htmldocs texinfodocs latexdocs epubdocs xmldocs: $(YNL_INDEX)
-
 htmldocs:
 	@$(srctree)/scripts/sphinx-pre-install --version-check
 	@+$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,html,$(var),,$(var)))
@@ -186,7 +170,6 @@ refcheckdocs:
 	$(Q)cd $(srctree);scripts/documentation-file-ref-check
 
 cleandocs:
-	$(Q)rm -f $(YNL_INDEX) $(YNL_RST_FILES)
 	$(Q)rm -rf $(BUILDDIR)
 	$(Q)$(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/userspace-api/media clean
 
diff --git a/Documentation/conf.py b/Documentation/conf.py
index 700516238d3f..f9828f3862f9 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -42,6 +42,15 @@ exclude_patterns = []
 dyn_include_patterns = []
 dyn_exclude_patterns = ["output"]
 
+# Currently, only netlink/specs has a parser for yaml.
+# Prefer using include patterns if available, as it is faster
+if has_include_patterns:
+    dyn_include_patterns.append("netlink/specs/*.yaml")
+else:
+    dyn_exclude_patterns.append("netlink/*.yaml")
+    dyn_exclude_patterns.append("devicetree/bindings/**.yaml")
+    dyn_exclude_patterns.append("core-api/kho/bindings/**.yaml")
+
 # Properly handle include/exclude patterns
 # ----------------------------------------
 
@@ -102,12 +111,12 @@ extensions = [
     "kernel_include",
     "kfigure",
     "maintainers_include",
+    "parser_yaml",
     "rstFlatTable",
     "sphinx.ext.autosectionlabel",
     "sphinx.ext.ifconfig",
     "translations",
 ]
-
 # Since Sphinx version 3, the C function parser is more pedantic with regards
 # to type checking. Due to that, having macros at c:function cause problems.
 # Those needed to be escaped by using c_id_attributes[] array
@@ -204,10 +213,11 @@ else:
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["sphinx/templates"]
 
-# The suffix(es) of source filenames.
-# You can specify multiple suffix as a list of string:
-# source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
+# The suffixes of source filenames that will be automatically parsed
+source_suffix = {
+    ".rst": "restructuredtext",
+    ".yaml": "yaml",
+}
 
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'
diff --git a/Documentation/netlink/specs/index.rst b/Documentation/netlink/specs/index.rst
new file mode 100644
index 000000000000..7f7cf4a096f2
--- /dev/null
+++ b/Documentation/netlink/specs/index.rst
@@ -0,0 +1,13 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. _specs:
+
+=============================
+Netlink Family Specifications
+=============================
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   *
diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index ac90b82f3ce9..b7a4969e9bc9 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -57,7 +57,7 @@ Contents:
    filter
    generic-hdlc
    generic_netlink
-   netlink_spec/index
+   ../netlink/specs/index
    gen_stats
    gtp
    ila
diff --git a/Documentation/networking/netlink_spec/.gitignore b/Documentation/networking/netlink_spec/.gitignore
deleted file mode 100644
index 30d85567b592..000000000000
--- a/Documentation/networking/netlink_spec/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-*.rst
diff --git a/Documentation/networking/netlink_spec/readme.txt b/Documentation/networking/netlink_spec/readme.txt
deleted file mode 100644
index 030b44aca4e6..000000000000
--- a/Documentation/networking/netlink_spec/readme.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-SPDX-License-Identifier: GPL-2.0
-
-This file is populated during the build of the documentation (htmldocs) by the
-tools/net/ynl/pyynl/ynl_gen_rst.py script.
diff --git a/Documentation/sphinx/parser_yaml.py b/Documentation/sphinx/parser_yaml.py
new file mode 100755
index 000000000000..634d84a202fc
--- /dev/null
+++ b/Documentation/sphinx/parser_yaml.py
@@ -0,0 +1,123 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2025 Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
+
+"""
+Sphinx extension for processing YAML files
+"""
+
+import os
+import re
+import sys
+
+from pprint import pformat
+
+from docutils import statemachine
+from docutils.parsers.rst import Parser as RSTParser
+from docutils.parsers.rst import states
+from docutils.statemachine import ViewList
+
+from sphinx.util import logging
+from sphinx.parsers import Parser
+
+srctree = os.path.abspath(os.environ["srctree"])
+sys.path.insert(0, os.path.join(srctree, "tools/net/ynl/pyynl/lib"))
+
+from doc_generator import YnlDocGenerator        # pylint: disable=C0413
+
+logger = logging.getLogger(__name__)
+
+class YamlParser(Parser):
+    """
+    Kernel parser for YAML files.
+
+    This is a simple sphinx.Parser to handle yaml files inside the
+    Kernel tree that will be part of the built documentation.
+
+    The actual parser function is not contained here: the code was
+    written in a way that parsing yaml for different subsystems
+    can be done from a single dispatcher.
+
+    All it takes to have parse YAML patches is to have an import line:
+
+            from some_parser_code import NewYamlGenerator
+
+    To this module. Then add an instance of the parser with:
+
+            new_parser = NewYamlGenerator()
+
+    and add a logic inside parse() to handle it based on the path,
+    like this:
+
+            if "/foo" in fname:
+                msg = self.new_parser.parse_yaml_file(fname)
+    """
+
+    supported = ('yaml', )
+
+    netlink_parser = YnlDocGenerator()
+
+    re_lineno = re.compile(r"\.\. LINENO ([0-9]+)$")
+
+    tab_width = 8
+
+    def rst_parse(self, inputstring, document, msg):
+        """
+        Receives a ReST content that was previously converted by the
+        YAML parser, adding it to the document tree.
+        """
+
+        self.setup_parse(inputstring, document)
+
+        result = ViewList()
+
+        self.statemachine = states.RSTStateMachine(state_classes=states.state_classes,
+                                                   initial_state='Body',
+                                                   debug=document.reporter.debug_flag)
+
+        try:
+            # Parse message with RSTParser
+            lineoffset = 0;
+
+            lines = statemachine.string2lines(msg, self.tab_width,
+                                              convert_whitespace=True)
+
+            for line in lines:
+                match = self.re_lineno.match(line)
+                if match:
+                    lineoffset = int(match.group(1))
+                    continue
+
+                result.append(line, document.current_source, lineoffset)
+
+            self.statemachine.run(result, document)
+
+        except Exception as e:
+            document.reporter.error("YAML parsing error: %s" % pformat(e))
+
+        self.finish_parse()
+
+    # Overrides docutils.parsers.Parser. See sphinx.parsers.RSTParser
+    def parse(self, inputstring, document):
+        """Check if a YAML is meant to be parsed."""
+
+        fname = document.current_source
+
+        # Handle netlink yaml specs
+        if "/netlink/specs/" in fname:
+            msg = self.netlink_parser.parse_yaml_file(fname)
+            self.rst_parse(inputstring, document, msg)
+
+        # All other yaml files are ignored
+
+def setup(app):
+    """Setup function for the Sphinx extension."""
+
+    # Add YAML parser
+    app.add_source_parser(YamlParser)
+    app.add_source_suffix('.yaml', 'yaml')
+
+    return {
+        'version': '1.0',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }
diff --git a/Documentation/userspace-api/netlink/index.rst b/Documentation/userspace-api/netlink/index.rst
index c1b6765cc963..83ae25066591 100644
--- a/Documentation/userspace-api/netlink/index.rst
+++ b/Documentation/userspace-api/netlink/index.rst
@@ -18,4 +18,4 @@ Netlink documentation for users.
 
 See also:
  - :ref:`Documentation/core-api/netlink.rst <kernel_netlink>`
- - :ref:`Documentation/networking/netlink_spec/index.rst <specs>`
+ - :ref:`Documentation/netlink/specs/index.rst <specs>`
diff --git a/Documentation/userspace-api/netlink/netlink-raw.rst b/Documentation/userspace-api/netlink/netlink-raw.rst
index 31fc91020eb3..aae296c170c5 100644
--- a/Documentation/userspace-api/netlink/netlink-raw.rst
+++ b/Documentation/userspace-api/netlink/netlink-raw.rst
@@ -62,8 +62,8 @@ Sub-messages
 ------------
 
 Several raw netlink families such as
-:doc:`rt-link<../../networking/netlink_spec/rt-link>` and
-:doc:`tc<../../networking/netlink_spec/tc>` use attribute nesting as an
+:ref:`rt-link<netlink-rt-link>` and
+:ref:`tc<netlink-tc>` use attribute nesting as an
 abstraction to carry module specific information.
 
 Conceptually it looks as follows::
@@ -162,7 +162,7 @@ then this is an error.
 Nested struct definitions
 -------------------------
 
-Many raw netlink families such as :doc:`tc<../../networking/netlink_spec/tc>`
+Many raw netlink families such as :ref:`tc<netlink-tc>`
 make use of nested struct definitions. The ``netlink-raw`` schema makes it
 possible to embed a struct within a struct definition using the ``struct``
 property. For example, the following struct definition embeds the
diff --git a/Documentation/userspace-api/netlink/specs.rst b/Documentation/userspace-api/netlink/specs.rst
index 1b50d97d8d7c..debb4bfca5c4 100644
--- a/Documentation/userspace-api/netlink/specs.rst
+++ b/Documentation/userspace-api/netlink/specs.rst
@@ -15,7 +15,7 @@ kernel headers directly.
 Internally kernel uses the YAML specs to generate:
 
  - the C uAPI header
- - documentation of the protocol as a ReST file - see :ref:`Documentation/networking/netlink_spec/index.rst <specs>`
+ - documentation of the protocol as a ReST file - see :ref:`Documentation/netlink/specs/index.rst <specs>`
  - policy tables for input attribute validation
  - operation tables