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

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Date:   Mon, 9 May 2022 11:00:49 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Cc:     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,

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?

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