ynl: re-license uniformly under GPL-2.0 OR BSD-3-Clause

I was intending to make all the Netlink Spec code BSD-3-Clause
to ease the adoption but it appears that:
 - I fumbled the uAPI and used "GPL WITH uAPI note" there
 - it gives people pause as they expect GPL in the kernel
As suggested by Chuck re-license under dual. This gives us benefit
of full BSD freedom while fulfilling the broad "kernel is under GPL"
expectations.

Link: https://lore.kernel.org/all/20230304120108.05dd44c5@kernel.org/
Link: https://lore.kernel.org/r/20230306200457.3903854-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

20 files changed, 28 insertions, 18 deletions

diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml
index bbcfa2472b04..f082a5ad7cf1 100644
--- a/Documentation/netlink/genetlink-c.yaml
+++ b/Documentation/netlink/genetlink-c.yaml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: GPL-2.0
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 %YAML 1.2
 ---
 $id: http://kernel.org/schemas/netlink/genetlink-c.yaml#
diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml
index 5642925c4ceb..c6b8c77f7d12 100644
--- a/Documentation/netlink/genetlink-legacy.yaml
+++ b/Documentation/netlink/genetlink-legacy.yaml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: GPL-2.0
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 %YAML 1.2
 ---
 $id: http://kernel.org/schemas/netlink/genetlink-legacy.yaml#
diff --git a/Documentation/netlink/genetlink.yaml b/Documentation/netlink/genetlink.yaml
index 62a922755ce2..b2d56ab9e615 100644
--- a/Documentation/netlink/genetlink.yaml
+++ b/Documentation/netlink/genetlink.yaml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: GPL-2.0
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 %YAML 1.2
 ---
 $id: http://kernel.org/schemas/netlink/genetlink-legacy.yaml#
diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml
index 35c462bce56f..18ecb7d90cbe 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+
 name: ethtool
 
 protocol: genetlink-legacy
diff --git a/Documentation/netlink/specs/fou.yaml b/Documentation/netlink/specs/fou.yaml
index cca4cf98f03a..cff104288723 100644
--- a/Documentation/netlink/specs/fou.yaml
+++ b/Documentation/netlink/specs/fou.yaml
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+
 name: fou
 
 protocol: genetlink-legacy
diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index ba9ee13cf729..24de747b5344 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+
 name: netdev
 
 doc:
diff --git a/Documentation/userspace-api/netlink/specs.rst b/Documentation/userspace-api/netlink/specs.rst
index 32e53328d113..2122e0c4a399 100644
--- a/Documentation/userspace-api/netlink/specs.rst
+++ b/Documentation/userspace-api/netlink/specs.rst
@@ -24,6 +24,9 @@ YAML specifications can be found under ``Documentation/netlink/specs/``
 This document describes details of the schema.
 See :doc:`intro-specs` for a practical starting guide.
 
+All specs must be licensed under ``GPL-2.0-only OR BSD-3-Clause``
+to allow for easy adoption in user space code.
+
 Compatibility levels
 ====================
 
diff --git a/include/uapi/linux/fou.h b/include/uapi/linux/fou.h
index 19ebbef41a63..5041c3598493 100644
--- a/include/uapi/linux/fou.h
+++ b/include/uapi/linux/fou.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause */
 /* Do not edit directly, auto-generated from: */
 /*	Documentation/netlink/specs/fou.yaml */
 /* YNL-GEN uapi header */
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 588391447bfb..8c4e3e536c04 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause */
 /* Do not edit directly, auto-generated from: */
 /*	Documentation/netlink/specs/netdev.yaml */
 /* YNL-GEN uapi header */
diff --git a/net/core/netdev-genl-gen.c b/net/core/netdev-genl-gen.c
index 48812ec843f5..9e10802587fc 100644
--- a/net/core/netdev-genl-gen.c
+++ b/net/core/netdev-genl-gen.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BSD-3-Clause
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /* Do not edit directly, auto-generated from: */
 /*	Documentation/netlink/specs/netdev.yaml */
 /* YNL-GEN kernel source */
diff --git a/net/core/netdev-genl-gen.h b/net/core/netdev-genl-gen.h
index b16dc7e026bb..2c5fc7d1e8a7 100644
--- a/net/core/netdev-genl-gen.h
+++ b/net/core/netdev-genl-gen.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /* Do not edit directly, auto-generated from: */
 /*	Documentation/netlink/specs/netdev.yaml */
 /* YNL-GEN kernel header */
diff --git a/net/ipv4/fou_nl.c b/net/ipv4/fou_nl.c
index 6c3820f41dd5..5c14fe030eda 100644
--- a/net/ipv4/fou_nl.c
+++ b/net/ipv4/fou_nl.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: BSD-3-Clause
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /* Do not edit directly, auto-generated from: */
 /*	Documentation/netlink/specs/fou.yaml */
 /* YNL-GEN kernel source */
diff --git a/net/ipv4/fou_nl.h b/net/ipv4/fou_nl.h
index b7a68121ce6f..58b1e1ed4b3b 100644
--- a/net/ipv4/fou_nl.h
+++ b/net/ipv4/fou_nl.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /* Do not edit directly, auto-generated from: */
 /*	Documentation/netlink/specs/fou.yaml */
 /* YNL-GEN kernel header */
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 588391447bfb..8c4e3e536c04 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause */
 /* Do not edit directly, auto-generated from: */
 /*	Documentation/netlink/specs/netdev.yaml */
 /* YNL-GEN uapi header */
diff --git a/tools/net/ynl/cli.py b/tools/net/ynl/cli.py
index db410b74d539..ffaa8038aa8c 100755
--- a/tools/net/ynl/cli.py
+++ b/tools/net/ynl/cli.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# SPDX-License-Identifier: BSD-3-Clause
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 
 import argparse
 import json
diff --git a/tools/net/ynl/lib/__init__.py b/tools/net/ynl/lib/__init__.py
index 3c73f59eabab..a2cb8b16d6f1 100644
--- a/tools/net/ynl/lib/__init__.py
+++ b/tools/net/ynl/lib/__init__.py
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: BSD-3-Clause
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 
 from .nlspec import SpecAttr, SpecAttrSet, SpecFamily, SpecOperation
 from .ynl import YnlFamily
diff --git a/tools/net/ynl/lib/nlspec.py b/tools/net/ynl/lib/nlspec.py
index 9d394e50de23..0a2cfb5862aa 100644
--- a/tools/net/ynl/lib/nlspec.py
+++ b/tools/net/ynl/lib/nlspec.py
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: BSD-3-Clause
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 
 import collections
 import importlib
diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index 1c7411ee04dc..a842adc8e87e 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: BSD-3-Clause
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 
 import functools
 import os
diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 62f8f2c3c56c..c940ca834d3f 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 
 import argparse
 import collections
@@ -2127,12 +2128,12 @@ def main():
 
     _, spec_kernel = find_kernel_root(args.spec)
     if args.mode == 'uapi':
-        cw.p('/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */')
+        cw.p('/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause */')
     else:
         if args.header:
-            cw.p('/* SPDX-License-Identifier: BSD-3-Clause */')
+            cw.p('/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */')
         else:
-            cw.p('// SPDX-License-Identifier: BSD-3-Clause')
+            cw.p('// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause')
     cw.p("/* Do not edit directly, auto-generated from: */")
     cw.p(f"/*\t{spec_kernel} */")
     cw.p(f"/* YNL-GEN {args.mode} {'header' if args.header else 'source'} */")
diff --git a/tools/net/ynl/ynl-regen.sh b/tools/net/ynl/ynl-regen.sh
index 43989ae48ed0..74f5de1c2399 100755
--- a/tools/net/ynl/ynl-regen.sh
+++ b/tools/net/ynl/ynl-regen.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-# SPDX-License-Identifier: BSD-3-Clause
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 
 TOOL=$(dirname $(realpath $0))/ynl-gen-c.py