netdev - Re: [PATCH v2 bpf-next 0/8] bpf: Allow bpf tcp iter to do bpf

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Date:   Wed, 14 Jul 2021 18:29:19 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Kernel Team <kernel-team@...com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Network Development <netdev@...r.kernel.org>,
        Yonghong Song <yhs@...com>, Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH v2 bpf-next 0/8] bpf: Allow bpf tcp iter to do bpf_(get|set)sockopt

On Thu, Jul 1, 2021 at 1:05 PM Martin KaFai Lau <kafai@...com> wrote:
>
> This set is to allow bpf tcp iter to call bpf_(get|set)sockopt.
>
> With bpf-tcp-cc, new algo rollout happens more often.  Instead of
> restarting the applications to pick up the new tcp-cc, this set
> allows the bpf tcp iter to call bpf_(get|set)sockopt(TCP_CONGESTION).
> It is not limited to TCP_CONGESTION, the bpf tcp iter can call
> bpf_(get|set)sockopt() with other options.  The bpf tcp iter can read
> into all the fields of a tcp_sock, so there is a lot of flexibility
> to select the desired sk to do setsockopt(), e.g. it can test for
> TCP_LISTEN only and leave the established connections untouched,
> or check the addr/port, or check the current tcp-cc name, ...etc.
>
> Patch 1-4 are some cleanup and prep work in the tcp and bpf seq_file.
>
> Patch 5 is to have the tcp seq_file iterate on the
> port+addr lhash2 instead of the port only listening_hash.
...
>  include/linux/bpf.h                           |   8 +
>  include/net/inet_hashtables.h                 |   6 +
>  include/net/tcp.h                             |   1 -
>  kernel/bpf/bpf_iter.c                         |  22 +
>  kernel/trace/bpf_trace.c                      |   7 +-
>  net/core/filter.c                             |  34 ++
>  net/ipv4/tcp_ipv4.c                           | 410 ++++++++++++++----

Eric,

Could you please review this set where it touches inet bits?
I've looked a few times and it all looks fine to me, but I'm no expert
in those parts.