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

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Date:   Sat, 9 Dec 2017 08:47:45 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Song Liu <songliubraving@...com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        yoshfuji@...ux-ipv6.org, Steven Rostedt <rostedt@...dmis.org>,
        Brendan Gregg <bgregg@...flix.com>, netdev@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 net-next] net/tcp: trace all TCP/IP state transition
 with tcp_set_state tracepoint

2017-12-09 0:28 GMT+08:00 David Miller <davem@...emloft.net>:
> From: Yafang Shao <laoar.shao@...il.com>
> Date: Fri, 8 Dec 2017 23:50:44 +0800
>
>> 2017-12-08 23:42 GMT+08:00 David Miller <davem@...emloft.net>:
>>> 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.
>>
>> Do you mean that tcp_set_state tracepoint should be replaced with
>> sk_set_state tracepoint and move that tracepoint to
>> trace/events/sock.h ?
>
> Yes, something like that.
>
> It will avoid all of these protocol specific checks and weird
> dependencies.

That looks like a good idea.
I will try to reimplemnet it.


Thanks
Yafang