linux-kernel - Re: [PATCH v3] tracepoint: add new `tcp:tcp_ca

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Date:   Sat, 12 Aug 2023 21:04:50 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Zheao Li <me@...jusaka.me>
Cc:     edumazet@...gle.com, bpf@...r.kernel.org, davem@...emloft.net,
        dsahern@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, mhiramat@...nel.org,
        ncardwell@...gle.com, netdev@...r.kernel.org, pabeni@...hat.com,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v3] tracepoint: add new `tcp:tcp_ca_event` trace event

On Sat, 12 Aug 2023 21:01:40 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Sat, 12 Aug 2023 20:59:05 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > On Sat, 12 Aug 2023 20:12:50 +0000
> > Zheao Li <me@...jusaka.me> wrote:
> >   
> > > +TRACE_EVENT(tcp_ca_event,
> > > +
> > > +	TP_PROTO(struct sock *sk, const u8 ca_event),
> > > +
> > > +	TP_ARGS(sk, ca_event),
> > > +
> > > +	TP_STRUCT__entry(
> > > +		__field(const void *, skaddr)
> > > +		__field(__u16, sport)
> > > +		__field(__u16, dport)
> > > +		__field(__u16, family)
> > > +		__array(__u8, saddr, 4)
> > > +		__array(__u8, daddr, 4)
> > > +		__array(__u8, saddr_v6, 16)
> > > +		__array(__u8, daddr_v6, 16)
> > > +		__field(__u8, ca_event)    
> > 
> > Please DO NOT LISTEN TO CHECKPATCH!

I forgot to say "for TRACE_EVENT() macros". This is not about what
checkpatch says about other code.

-- Steve


> > 
> > The above looks horrendous! Put it back to:
> >   
> > > +		__field(	const void *,	skaddr			)
> > > +		__field(	__u16,		sport			)
> > > +		__field(	__u16,		dport			)
> > > +		__field(	__u16,		family			)
> > > +		__array(	__u8,		saddr,		4	)
> > > +		__array(	__u8,		daddr,		4	)
> > > +		__array(	__u8,		saddr_v6,	16	)
> > > +		__array(	__u8,		daddr_v6,	16	)
> > > +		__field(	__u8,		ca_event		)    
> > 
> > See how much better it looks I can see fields this way.
> > 
> > The "checkpatch" way is a condensed mess.
> >   
>