tools/net/ynl: Add type info to struct members in generated docs

Extend the ynl doc generator to include type information for struct
members, ignoring the pad type.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240129223458.52046-13-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl-gen-rst: Remove extra indentation from generated docs

The output from ynl-gen-rst.py has extra indentation that causes extra
<blockquote> elements to be generated in the HTML output.

Reduce the indentation so that sphinx doesn't generate unnecessary
<blockquote> elements.

Reviewed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231215093720.18774-14-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl-gen-rst: Remove bold from attribute-set headings

The generated .rst for attribute-sets currently uses a sub-sub-heading
for each attribute, with the attribute name in bold. This makes
attributes stand out more than the attribute-set sub-headings they are
part of.

Remove the bold markup from attribute sub-sub-headings.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231215093720.18774-13-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl-gen-rst: Sort the index of generated netlink specs

The index of netlink specs was being generated unsorted. Sort the output
before generating the index entries.

Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231215093720.18774-12-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl-gen-rst: Add sub-messages to generated docs

Add a section for sub-messages to the generated .rst files.

Reviewed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231215093720.18774-11-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

docs: netlink: link to family documentations from spec info

To increase the chances of people finding the rendered docs
add a link to specs.rst and index.rst.

Add a label in the generated index.rst and while at it adjust
the title a little bit.

Reviewed-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20231129041427.2763074-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation: Document each netlink family

This is a simple script that parses the Netlink YAML spec files
(Documentation/netlink/specs/), and generates RST files to be rendered
in the Network -> Netlink Specification documentation page.

Create a python script that is invoked during 'make htmldocs', reads the
YAML specs input file and generate the correspondent RST file.

Create a new Documentation/networking/netlink_spec index page, and
reference each Netlink RST file that was processed above in this main
index.rst file.

In case of any exception during the parsing, dump the error and skip
the file.

Do not regenerate the RST files if the input files (YAML) were not
changed in-between invocations.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>

----
Changelog:

V3:
* Do not regenerate the RST files if the input files were not
changed. In order to do it, a few things changed:
- Rely on Makefile more to find what changed, and trigger
individual file processing
- The script parses file by file now (instead of batches)
- Create a new option to generate the index file

V2:
* Moved the logic from a sphinx extension to a external script
* Adjust some formatting as suggested by Donald Hunter and Jakub
* Auto generating all the rsts instead of having stubs
* Handling error gracefully
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>