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

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Date:   Tue, 20 Jul 2021 11:05:02 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Martin KaFai Lau <kafai@...com>,
        Eric Dumazet <eric.dumazet@...il.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 Wed, Jul 14, 2021 at 6:29 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> 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.

Eric,

ping!
If you're on vacation or something I'm inclined to land the patches
and let Martin address your review feedback in follow up patches.

Thanks