netdev - Re: [PATCH bpf-next 0/8] bpf: TCP RTT sock

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Date:   Mon, 1 Jul 2019 14:15:01 -0700
From:   Yuchung Cheng <ycheng@...gle.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     netdev <netdev@...r.kernel.org>, bpf@...r.kernel.org,
        David Miller <davem@...emloft.net>, ast@...nel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Priyaranjan Jha <priyarjha@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH bpf-next 0/8] bpf: TCP RTT sock_ops bpf callback

On Mon, Jul 1, 2019 at 1:48 PM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> Congestion control team would like to have a periodic callback to
> track some TCP statistics. Let's add a sock_ops callback that can be
> selectively enabled on a socket by socket basis and is executed for
> every RTT. BPF program frequency can be further controlled by calling
> bpf_ktime_get_ns and bailing out early.
>
> I run neper tcp_stream and tcp_rr tests with the sample program
> from the last patch and didn't observe any noticeable performance
> difference.
>
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Priyaranjan Jha <priyarjha@...gle.com>
> Cc: Yuchung Cheng <ycheng@...gle.com>
Acked-by: Yuchung Cheng <ycheng@...gle.com>

Thanks!

> Cc: Soheil Hassas Yeganeh <soheil@...gle.com>
>
> Stanislav Fomichev (8):
>   bpf: add BPF_CGROUP_SOCK_OPS callback that is executed on every RTT
>   bpf: split shared bpf_tcp_sock and bpf_sock_ops implementation
>   bpf: add dsack_dups/delivered{,_ce} to bpf_tcp_sock
>   bpf: add icsk_retransmits to bpf_tcp_sock
>   bpf/tools: sync bpf.h
>   selftests/bpf: test BPF_SOCK_OPS_RTT_CB
>   samples/bpf: add sample program that periodically dumps TCP stats
>   samples/bpf: fix tcp_bpf.readme detach command
>
>  include/net/tcp.h                           |   8 +
>  include/uapi/linux/bpf.h                    |  12 +-
>  net/core/filter.c                           | 207 +++++++++++-----
>  net/ipv4/tcp_input.c                        |   4 +
>  samples/bpf/Makefile                        |   1 +
>  samples/bpf/tcp_bpf.readme                  |   2 +-
>  samples/bpf/tcp_dumpstats_kern.c            |  65 +++++
>  tools/include/uapi/linux/bpf.h              |  12 +-
>  tools/testing/selftests/bpf/Makefile        |   3 +-
>  tools/testing/selftests/bpf/progs/tcp_rtt.c |  61 +++++
>  tools/testing/selftests/bpf/test_tcp_rtt.c  | 253 ++++++++++++++++++++
>  11 files changed, 570 insertions(+), 58 deletions(-)
>  create mode 100644 samples/bpf/tcp_dumpstats_kern.c
>  create mode 100644 tools/testing/selftests/bpf/progs/tcp_rtt.c
>  create mode 100644 tools/testing/selftests/bpf/test_tcp_rtt.c
>
> --
> 2.22.0.410.gd8fdbe21b5-goog