linux-kernel - Re: [PATCH net-next 1/2] net: snmp: add tracepoint support for snmp

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Message-ID: <20211116163407.7e0c6129@gandalf.local.home>
Date:   Tue, 16 Nov 2021 16:34:07 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     menglong8.dong@...il.com
Cc:     kuba@...nel.org, davem@...emloft.net, mingo@...hat.com,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, imagedong@...cent.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net: snmp: add tracepoint support for snmp

On Thu, 11 Nov 2021 21:35:29 +0800
menglong8.dong@...il.com wrote:

> +#define DEFINE_SNMP_EVENT(proto)				\
> +DEFINE_EVENT(snmp_template, snmp_##proto,			\
> +	TP_PROTO(struct sk_buff *skb, int field, int val),	\
> +	TP_ARGS(skb, field, val)				\
> +)
> +
> +#define TRACE_SNMP(skb, proto, field, val) \
> +	trace_snmp_##proto(skb, field, val)
> +
> +#endif

Why make a separate trace event for each protocol, and not just create an
enum that gets passed to the trace event? Then you could just filter on
what you want.

-- Steve