linux-kernel - Re: [PATCH v5 net-next] net/tcp: trace all TCP/IP state transition with tcp_set

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Date:   Fri, 08 Dec 2017 10:42:56 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     laoar.shao@...il.com
Cc:     marcelo.leitner@...il.com, songliubraving@...com,
        kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, rostedt@...dmis.org,
        bgregg@...flix.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 net-next] net/tcp: trace all TCP/IP state transition
 with tcp_set_state tracepoint

From: Yafang Shao <laoar.shao@...il.com>
Date: Fri, 8 Dec 2017 11:40:23 +0800

> It will looks like these,
> 
>     if (sk->sk_protocol == IPPROTO_TCP)
>         __tcp_set_state(newsk, TCP_SYN_RECV);
>     else
>         newsk->sk_state = TCP_SYN_RECV;
> 
> 
>     if (sk->sk_protocol == IPPROTO_TCP)
>           __tcp_set_state(sk, TCP_CLOSE);
>     else
>           sk->sk_state = TCP_CLOSE;
> 
>     if (sk->sk_protocol == IPPROTO_TCP)
>           tcp_state_store(sk,  state);
>     else
>           sk_state_store(sk, state);
> 
> 
> Some redundant code.
> 
> IMO, put these similar code into a wrapper is more nice.

I think this discussion and how ugly this is getting shows that
tracing the state transitions of a socket is perhaps not best as a TCP
specific feature.