linux-kernel - Re: [PATCH] [RFC PATCH] tcp event: add new tcp:tcp_cwnd

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Date:   Mon, 7 Aug 2023 15:25:56 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Manjusaka <me@...jusaka.me>
Cc:     mhiramat@...nel.org, rostedt@...dmis.org, davem@...emloft.net,
        dsahern@...nel.org, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH] [RFC PATCH] tcp event: add new tcp:tcp_cwnd_restart event

On Mon, Aug 7, 2023 at 2:49 PM Manjusaka <me@...jusaka.me> wrote:
>
> > Do not include code before variable declarations.
> Sorry about that. I will update the code later.
>
> > I would rather add a trace in tcp_ca_event(), this would be more generic ?
>
> https://elixir.bootlin.com/linux/latest/source/net/ipv4/tcp_cong.c#L41
>
> I think maybe we already have the tcp_ca_event but named tcp_cong_state_set?

I am speaking of tcp_ca_event()...

For instance, tcp_cwnd_restart() calls tcp_ca_event(sk, CA_EVENT_CWND_RESTART);

tcp_set_ca_state() can only set icsk_ca_state to one value from enum
tcp_ca_state:
TCP_CA_Open, TCP_CA_Disorder, TCP_CA_CWR, TCP_CA_Recovery, TCP_CA_Loss

enum tcp_ca_event has instead:
CA_EVENT_TX_START, CA_EVENT_CWND_RESTART, CA_EVENT_COMPLETE_CWR,
CA_EVENT_LOSS, CA_EVENT_ECN_NO_CE, CA_EVENT_ECN_IS_CE