netdev - Re: [PATCH iproute2 1/2] tc: u32: add support for json output

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Date:   Tue, 7 Sep 2021 12:29:14 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Wen Liang <liangwen12year@...il.com>
Cc:     netdev@...r.kernel.org, dsahern@...il.com, aclaudi@...hat.com
Subject: Re: [PATCH iproute2 1/2] tc: u32: add support for json output

On Mon,  6 Sep 2021 21:57:50 -0400
Wen Liang <liangwen12year@...il.com> wrote:

>  	} else {
> -		fprintf(f, "??? ");
> +		print_string(PRINT_ANY, NULL, "%s", "??? ");
>  	}

This would be better handled by printing a real error message
on stderr, rather than continuing this confusing message.

+		print_lluint(PRINT_ANY, "rule hit", "(rule hit %llu ", (unsigned long long) pf->rcnt);
+		print_lluint(PRINT_ANY, "success", "success %llu)", (unsigned long long) pf->rhit);
+	}

There is print_u64 which is better than doing these casts.

+				print_hex(PRINT_ANY, "offset mask", "%04x", ntohs(sel->offmask));
+				print_int(PRINT_ANY, "offset shift", ">>%d ", sel->offshift);
+				print_int(PRINT_ANY, "offset off", "at %d ", sel->offoff);

Space is not valid in JSON tag.

Please test by running the output from your changes into a JSON parser.
Example:
     tc -j ... | python3 -m json.tool