bpf,docs: Create new standardization subdirectory

The BPF standardization effort is actively underway with the IETF. As
described in the BPF Working Group (WG) charter in [0], there are a
number of proposed documents, some informational and some proposed
standards, that will be drafted as part of the standardization effort.

[0]: https://datatracker.ietf.org/wg/bpf/about/

Though the specific documents that will formally be standardized will
exist as Internet Drafts (I-D) and WG documents in the BPF WG
datatracker page, the source of truth from where those documents will be
generated will reside in the kernel documentation tree (originating in
the bpf-next tree).

Because these documents will be used to generate the I-D and WG
documents which will be standardized with the IETF, they are a bit
special as far as kernel-tree documentation goes:

- They will be dual licensed with LGPL-2.1 OR BSD-2-Clause
- IETF I-D and WG documents (the documents which will actually be
  standardized) will be auto-generated from these documents.

In order to keep things clearly organized in the BPF documentation tree,
and to make it abundantly clear where standards-related documentation
needs to go, we should move standards-relevant documents into a separate
standardization/ subdirectory.

Signed-off-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20230710183027.15132-1-void@manifault.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Documentation/bpf/index.rst

@@ -12,9 +12,9 @@ that goes into great technical depth about the BPF Architecture.
 .. toctree::
    :maxdepth: 1
 
-   instruction-set
    verifier
    libbpf/index
+   standardization/index
    btf
    faq
    syscall_api
@@ -29,7 +29,6 @@ that goes into great technical depth about the BPF Architecture.
    bpf_licensing
    test_debug
    clang-notes
-   linux-notes
    other
    redirect
 

Documentation/bpf/standardization/index.rst

@@ -0,0 +1,18 @@
+.. SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+
+===================
+BPF Standardization
+===================
+
+This directory contains documents that are being iterated on as part of the BPF
+standardization effort with the IETF. See the `IETF BPF Working Group`_ page
+for the working group charter, documents, and more.
+
+.. toctree::
+   :maxdepth: 1
+
+   instruction-set
+   linux-notes
+
+.. Links:
+.. _IETF BPF Working Group: https://datatracker.ietf.org/wg/bpf/about/

Documentation/bpf/standardization/linux-notes.rst

@@ -45,7 +45,8 @@ On Linux, this integer is a BTF ID.
 Legacy BPF Packet access instructions
 =====================================
 
-As mentioned in the `ISA standard documentation <instruction-set.rst#legacy-bpf-packet-access-instructions>`_,
+As mentioned in the `ISA standard documentation
+<instruction-set.html#legacy-bpf-packet-access-instructions>`_,
 Linux has special eBPF instructions for access to packet data that have been
 carried over from classic BPF to retain the performance of legacy socket
 filters running in the eBPF interpreter.

MAINTAINERS

@@ -3746,7 +3746,7 @@ R:	David Vernet <void@manifault.com>
 L:	bpf@vger.kernel.org
 L:	bpf@ietf.org
 S:	Maintained
-F:	Documentation/bpf/instruction-set.rst
+F:	Documentation/bpf/standardization/
 
 BPF [GENERAL] (Safe Dynamic Programs and Tools)
 M:	Alexei Starovoitov <ast@kernel.org>