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

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Message-ID: <20220527181426.126367e5@kernel.org>
Date:   Fri, 27 May 2022 18:14:26 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     menglong8.dong@...il.com
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, nhorman@...driver.com,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        imagedong@...cent.com, dsahern@...nel.org, talalahmad@...gle.com,
        keescook@...omium.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] net: skb: use auto-generation to convert
 skb drop reason to string

On Fri, 27 May 2022 15:15:21 +0800 menglong8.dong@...il.com wrote:
> +clean-files := dropreason_str.h
> +
> +quiet_cmd_dropreason_str = GEN     $@
> +cmd_dropreason_str = echo '\n\#define __DEFINE_SKB_DROP_REASON(FN) \' > $@;\

echo -n

> +	sed -e '/enum skb_drop_reason {/,/}/!d' $< | \
> +	awk -F ',' '/SKB_DROP_REASON_/{printf "	FN(%s) \\\n", substr($$1, 18)}' >> $@;\
> +	echo '' >> $@

Trying to figure out when we're in the enum could be more robust
in case more stuff gets added to the header:

 | awk -F ',' '/^enum skb_drop/ { dr=1; } 
               /\}\;/           { dr=0; } 
               /^\tSKB_DROP/    { if (dr) {print $1;}}'

> +$(obj)/dropreason_str.h: $(srctree)/include/linux/dropreason.h
> +	$(call cmd,dropreason_str)
> +
> +$(obj)/skbuff.o: $(obj)/dropreason_str.h

Since we just generate the array directly now should we generate
a source file with it directly instead of generating a header with 
the huge define?