linux-kernel - Re: [PATCH net-next v4 2/3] net: skb: use auto-generation to convert skb drop reason to string

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Message-ID: <20220824181040.57ec009e@kernel.org>
Date:   Wed, 24 Aug 2022 18:10:40 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Menglong Dong <menglong8.dong@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        David Miller <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Neil Horman <nhorman@...driver.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Menglong Dong <imagedong@...cent.com>,
        David Ahern <dsahern@...nel.org>,
        Talal Ahmad <talalahmad@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH net-next v4 2/3] net: skb: use auto-generation to
 convert skb drop reason to string

On Wed, 24 Aug 2022 17:45:15 -0700 Eric Dumazet wrote:
> After this patch, I no longer have strings added after the reason: tag

Hm, using a kernel address (drop_reasons) as an argument to TP_printk()
definitely does not look right, but how to tickle whatever magic
__print_symbolic was providing I do not know :S

 	TP_printk("skbaddr=%p protocol=%u location=%p reason: %s",
 		  __entry->skbaddr, __entry->protocol, __entry->location,
-		  __print_symbolic(__entry->reason,
-				   TRACE_SKB_DROP_REASON))
+		  drop_reasons[__entry->reason])