Re: [PATCH iproute2 net-next] iplink: add support for protodown reason

[Stephen Hemminger]

On Thu, 20 Aug 2020 20:52:02 -0700
Roopa Prabhu <ro...@cumulusnetworks.com> wrote:

> +     if (tb[IFLA_PROTO_DOWN]) {
> +             if (rta_getattr_u8(tb[IFLA_PROTO_DOWN]))
> +                     print_bool(PRINT_ANY,
> +                                "proto_down", " protodown on ", true);

In general my preference is to use print_null() for presence flags.
Otherwise you have to handle the false case in JSON as a special case.