netdev - Re: [PATCH bpf-next v3 5/8] selftests: bpf: test bpf_skc_to_mptcp

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Date:   Tue, 10 May 2022 15:48:01 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Geliang Tang <geliang.tang@...e.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, mptcp@...ts.linux.dev
Subject: Re: [PATCH bpf-next v3 5/8] selftests: bpf: test
 bpf_skc_to_mptcp_sock

Hi Andrii,

On 09/05/2022 23:00, Andrii Nakryiko wrote:
> On Mon, May 9, 2022 at 2:00 AM Matthieu Baerts
> <matthieu.baerts@...sares.net> wrote:
>>
>> Hi Andrii,
>>
>> Thank you for the review!
>>
>> On 07/05/2022 00:26, Andrii Nakryiko wrote:
>>> On Mon, May 2, 2022 at 2:12 PM Mat Martineau
>>> <mathew.j.martineau@...ux.intel.com> wrote:
>>
>> (...)
>>
>>>> diff --git a/MAINTAINERS b/MAINTAINERS
>>>> index 359afc617b92..d48d3cb6abbc 100644
>>>> --- a/MAINTAINERS
>>>> +++ b/MAINTAINERS
>>>> @@ -13780,6 +13780,7 @@ F:      include/net/mptcp.h
>>>>  F:     include/trace/events/mptcp.h
>>>>  F:     include/uapi/linux/mptcp.h
>>>>  F:     net/mptcp/
>>>> +F:     tools/testing/selftests/bpf/bpf_mptcp_helpers.h
>>>>  F:     tools/testing/selftests/bpf/*/*mptcp*.c
>>>>  F:     tools/testing/selftests/net/mptcp/
>>>>
>>>> diff --git a/tools/testing/selftests/bpf/bpf_mptcp_helpers.h b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h
>>>> new file mode 100644
>>>> index 000000000000..18da4cc65e89
>>>> --- /dev/null
>>>> +++ b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h
>>>> @@ -0,0 +1,14 @@
>>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>>> +/* Copyright (c) 2022, SUSE. */
>>>> +
>>>> +#ifndef __BPF_MPTCP_HELPERS_H
>>>> +#define __BPF_MPTCP_HELPERS_H
>>>> +
>>>> +#include "bpf_tcp_helpers.h"
>>>> +
>>>> +struct mptcp_sock {
>>>> +       struct inet_connection_sock     sk;
>>>> +
>>>> +} __attribute__((preserve_access_index));
>>>
>>> why can't all this live in bpf_tcp_helpers.h? why do we need extra header?
>>
>> The main reason is related to the maintenance: to have MPTCP ML being
>> cc'd for all patches modifying this file.
>>
>> Do you prefer if all these specific MPTCP structures and macros and
>> mixed with TCP ones?
>>
> 
> These definitions don't even have to be 1:1 w/ whatever is kernel
> defining in terms of having all the fields, or their order, etc. So I
> think it won't require active maintenance and thus can be merged into
> bpf_tcp_helpers.h to keep it in one place.

Thank you for your reply!

New structures and macros[1] are going to be added later but I see your
point: there is nothing requiring an active maintenance. We can move
them all to bpf_tcp_helpers.h.

[1]
https://github.com/multipath-tcp/mptcp_net-next/blob/export/20220510T054929/tools/testing/selftests/bpf/bpf_mptcp_helpers.h

Cheers,
Matt
-- 
Tessares | Belgium | Hybrid Access Solutions
www.tessares.net