Re: [PATCH] [RFC PATCH] tcp event: add new tcp:tcp_cwnd_restart event

[Eric Dumazet]

On Mon, Aug 7, 2023 at 2:49 PM Manjusaka <me@xxxxxxxxxxxx> 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