netdev - Re: [PATCH bpf-next v2 0/8] bpf: TCP RTT sock

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Message-ID: <86dedabd-05fd-df3b-210b-8d9b0158146c@iogearbox.net>
Date:   Wed, 3 Jul 2019 17:04:04 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Priyaranjan Jha <priyarjha@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH bpf-next v2 0/8] bpf: TCP RTT sock_ops bpf callback

On 07/02/2019 06:13 PM, Stanislav Fomichev 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.
> 
> v2:
> * add a comment about second accept() in selftest (Yonghong Song)
> * refer to tcp_bpf.readme in sample program (Yonghong Song)
> 
> 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>
> Cc: Soheil Hassas Yeganeh <soheil@...gle.com>
> Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
> Acked-by: Yuchung Cheng <ycheng@...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            |  68 ++++++
>  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  | 254 ++++++++++++++++++++
>  11 files changed, 574 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
> 

Applied, thanks!