netdev - Re: [PATCH bpf-next v3 0/8] bpf: mptcp: Support for mptcp_sock and is

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Date:   Fri, 6 May 2022 16:06:09 -0700 (PDT)
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        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 0/8] bpf: mptcp: Support for mptcp_sock and
 is_mptcp

On Fri, 6 May 2022, Andrii Nakryiko wrote:

> On Mon, May 2, 2022 at 2:12 PM Mat Martineau
> <mathew.j.martineau@...ux.intel.com> wrote:
>>
>> This patch set adds BPF access to the is_mptcp flag in tcp_sock and
>> access to mptcp_sock structures, along with associated self tests. You
>> may recognize some of the code from earlier
>> (https://lore.kernel.org/bpf/20200918121046.190240-6-nicolas.rybowski@tessares.net/)
>> but it has been reworked quite a bit.
>>
>>
>> v1 -> v2: Emit BTF type, add func_id checks in verifier.c and bpf_trace.c,
>> remove build check for CONFIG_BPF_JIT, add selftest check for CONFIG_MPTCP,
>> and add a patch to include CONFIG_IKCONFIG/CONFIG_IKCONFIG_PROC for the
>> BPF self tests.
>>
>> v2 -> v3: Access sysctl through the filesystem to work around CI use of
>> the more limited busybox sysctl command.
>>
>>
>> Geliang Tang (6):
>>   bpf: add bpf_skc_to_mptcp_sock_proto
>>   selftests: bpf: Enable CONFIG_IKCONFIG_PROC in config
>>   selftests: bpf: test bpf_skc_to_mptcp_sock
>>   selftests: bpf: verify token of struct mptcp_sock
>>   selftests: bpf: verify ca_name of struct mptcp_sock
>>   selftests: bpf: verify first of struct mptcp_sock
>>
>
> It would be nice to use more consistent with the majority of other
> commits "selftests/bpf: " prefix. Thank you.

Sure, we'll update those prefixes and address your comments in the 
individual patches. Thanks for the review.

- Mat

>
>> Nicolas Rybowski (2):
>>   bpf: expose is_mptcp flag to bpf_tcp_sock
>>   selftests: bpf: add MPTCP test base
>>
>>  MAINTAINERS                                   |   2 +
>>  include/linux/bpf.h                           |   1 +
>>  include/linux/btf_ids.h                       |   3 +-
>>  include/net/mptcp.h                           |   6 +
>>  include/uapi/linux/bpf.h                      |   8 +
>>  kernel/bpf/verifier.c                         |   1 +
>>  kernel/trace/bpf_trace.c                      |   2 +
>>  net/core/filter.c                             |  27 +-
>>  net/mptcp/Makefile                            |   2 +
>>  net/mptcp/bpf.c                               |  22 ++
>>  scripts/bpf_doc.py                            |   2 +
>>  tools/include/uapi/linux/bpf.h                |   8 +
>>  .../testing/selftests/bpf/bpf_mptcp_helpers.h |  17 ++
>>  tools/testing/selftests/bpf/bpf_tcp_helpers.h |   4 +
>>  tools/testing/selftests/bpf/config            |   3 +
>>  tools/testing/selftests/bpf/network_helpers.c |  43 ++-
>>  tools/testing/selftests/bpf/network_helpers.h |   4 +
>>  .../testing/selftests/bpf/prog_tests/mptcp.c  | 272 ++++++++++++++++++
>>  .../testing/selftests/bpf/progs/mptcp_sock.c  |  80 ++++++
>>  19 files changed, 497 insertions(+), 10 deletions(-)
>>  create mode 100644 net/mptcp/bpf.c
>>  create mode 100644 tools/testing/selftests/bpf/bpf_mptcp_helpers.h
>>  create mode 100644 tools/testing/selftests/bpf/prog_tests/mptcp.c
>>  create mode 100644 tools/testing/selftests/bpf/progs/mptcp_sock.c
>>
>>
>> base-commit: 20b87e7c29dffcfa3f96f2e99daec84fd46cabdb
>> --
>> 2.36.0
>>
>

--
Mat Martineau
Intel