netdev - Re: [PATCH iproute2-next v4] ip-link: add support for nolocalbypass in vxlan

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Message-ID: <20230518084908.7c0e14d4@hermes.local>
Date: Thu, 18 May 2023 08:49:08 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Vladimir Nikishkin <vladimir@...ishkin.pw>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, eng.alaamohamedsoliman.am@...il.com,
 gnault@...hat.com, razor@...ckwall.org, idosch@...dia.com,
 liuhangbin@...il.com, eyal.birger@...il.com, jtoppins@...hat.com
Subject: Re: [PATCH iproute2-next v4] ip-link: add support for nolocalbypass
 in vxlan

On Thu, 18 May 2023 21:46:01 +0800
Vladimir Nikishkin <vladimir@...ishkin.pw> wrote:

> +	if (tb[IFLA_VXLAN_LOCALBYPASS]) {
> +		__u8 localbypass = rta_getattr_u8(tb[IFLA_VXLAN_LOCALBYPASS]);
> +
> +		print_bool(PRINT_JSON, "localbypass", NULL, localbypass);
> +		if (localbypass) {
> +			print_string(PRINT_FP, NULL, "localbypass ", NULL);
> +		} else {
> +			print_string(PRINT_FP, NULL, "nolocalbypass ", NULL);
> +		}
> +	}

You don't have to print anything if nolocalbypass.  Use presence as
a boolean in JSON.

I.e.
	if (tb[IFLA_VXLAN_LOCALBYPASS] &&
	   rta_getattr_u8(tb[IFLA_VXLAN_LOCALBYPASS])) {
		print_bool(PRINT_ANY, "localbypass", "localbypass", true);
	}

That is what other options do.
Follows the best practices for changes to existing programs: your
new feature should look like all the others.