netdev - Re: [PATCH bpf-next] libbpf: relicense bpf_helpers.h and bpf

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Date:   Fri, 16 Aug 2019 17:29:27 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Andrii Nakryiko <andriin@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        andrii.nakryiko@...il.com, kernel-team@...com,
        Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Michal Rostecki <mrostecki@...nsuse.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sargun Dhillon <sargun@...gun.me>
Subject: Re: [PATCH bpf-next] libbpf: relicense bpf_helpers.h and bpf_endian.h

On 8/16/19 2:10 PM, Jesper Dangaard Brouer wrote:
> On Thu, 15 Aug 2019 22:45:43 -0700
> Andrii Nakryiko <andriin@...com> wrote:
> 
>> bpf_helpers.h and bpf_endian.h contain useful macros and BPF helper
>> definitions essential to almost every BPF program. Which makes them
>> useful not just for selftests. To be able to expose them as part of
>> libbpf, though, we need them to be dual-licensed as LGPL-2.1 OR
>> BSD-2-Clause. This patch updates licensing of those two files.
> 
> I've already ACKed this, and is fine with (LGPL-2.1 OR BSD-2-Clause).
> 
> I just want to understand, why "BSD-2-Clause" and not "Apache-2.0" ?
> 
> The original argument was that this needed to be compatible with
> "Apache-2.0", then why not simply add this in the "OR" ?

It's use is discouraged in the kernel tree, see also LICENSES/dual/Apache-2.0 (below) and
statement wrt compatibility from https://www.apache.org/licenses/GPL-compatibility.html:

   Valid-License-Identifier: Apache-2.0
   SPDX-URL: https://spdx.org/licenses/Apache-2.0.html
   Usage-Guide:
     Do NOT use. The Apache-2.0 is not GPL2 compatible. [...]

>> Acked-by: Alexei Starovoitov <ast@...nel.org>
>> Acked-by: Hechao Li <hechaol@...com>
>> Acked-by: Martin KaFai Lau <kafai@...com>
>> Acked-by: Andrey Ignatov <rdna@...com>
>> Acked-by: Yonghong Song <yhs@...com>
>> Acked-by: Lawrence Brakmo <brakmo@...com>
>> Acked-by: Adam Barth <arb@...com>
>> Acked-by: Roman Gushchin <guro@...com>
>> Acked-by: Josef Bacik <jbacik@...com>
>> Acked-by: Joe Stringer <joe@...d.net.nz>
>> Acked-by: Daniel Borkmann <daniel@...earbox.net>
>> Acked-by: Joel Fernandes (Google) <joel@...lfernandes.org>
>> Acked-by: David Ahern <dsahern@...il.com>
>> Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>
> 
> Confirming I acked this.
> 
>> Acked-by: Ilya Leoshkevich <iii@...ux.ibm.com>
>> Acked-by: Lorenz Bauer <lmb@...udflare.com>
>> Acked-by: Adrian Ratiu <adrian.ratiu@...labora.com>
>> Acked-by: Nikita V. Shirokov <tehnerd@...nerd.com>
>> Acked-by: Willem de Bruijn <willemb@...gle.com>
>> Acked-by: Petar Penkov <ppenkov@...gle.com>
>> Acked-by: Teng Qin <palmtenor@...il.com>
>> Cc: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
>> Cc: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
>> Cc: David S. Miller <davem@...emloft.net>
>> Cc: Michal Rostecki <mrostecki@...nsuse.org>
>> Cc: John Fastabend <john.fastabend@...il.com>
>> Cc: Sargun Dhillon <sargun@...gun.me>
>> Signed-off-by: Andrii Nakryiko <andriin@...com>
>> ---
>>   tools/testing/selftests/bpf/bpf_endian.h  | 2 +-
>>   tools/testing/selftests/bpf/bpf_helpers.h | 2 +-
>>   2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/testing/selftests/bpf/bpf_endian.h b/tools/testing/selftests/bpf/bpf_endian.h
>> index 05f036df8a4c..ff3593b0ae03 100644
>> --- a/tools/testing/selftests/bpf/bpf_endian.h
>> +++ b/tools/testing/selftests/bpf/bpf_endian.h
>> @@ -1,4 +1,4 @@
>> -/* SPDX-License-Identifier: GPL-2.0 */
>> +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
>>   #ifndef __BPF_ENDIAN__
>>   #define __BPF_ENDIAN__
>>   
>> diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h
>> index 8b503ea142f0..6c4930bc6e2e 100644
>> --- a/tools/testing/selftests/bpf/bpf_helpers.h
>> +++ b/tools/testing/selftests/bpf/bpf_helpers.h
>> @@ -1,4 +1,4 @@
>> -/* SPDX-License-Identifier: GPL-2.0 */
>> +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
>>   #ifndef __BPF_HELPERS_H
>>   #define __BPF_HELPERS_H
>>   
> 
> 
>