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

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Date:   Mon, 07 Aug 2023 21:40:50 +0800
From:   Manjusaka <me@...jusaka.me>
To:     "Eric Dumazet" <edumazet@...gle.com>
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

Got you means! LGTM

I will make a patch later and make a try

On Mon, Aug 7, 2023, at 9:25 PM, Eric Dumazet wrote:
> 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
>