netdev - Re: [PATCH iproute2-next v2 03/11] lib: utils: Add print_on_off

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Date:   Mon, 2 Nov 2020 08:37:52 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     David Ahern <dsahern@...il.com>
Cc:     Petr Machata <me@...chata.org>, netdev@...r.kernel.org,
        stephen@...workplumber.org, john.fastabend@...il.com,
        jiri@...dia.com, idosch@...dia.com,
        Jakub Kicinski <kuba@...nel.org>,
        Roman Mashak <mrv@...atatu.com>
Subject: Re: [PATCH iproute2-next v2 03/11] lib: utils: Add
 print_on_off_bool()

On Sun, Nov 01, 2020 at 04:55:42PM -0700, David Ahern wrote:
> On 10/31/20 3:23 PM, Petr Machata wrote:
> >
> > David Ahern <dsahern@...il.com> writes:
> >
> >> On 10/30/20 6:29 AM, Petr Machata wrote:
> >>> diff --git a/lib/utils.c b/lib/utils.c
> >>> index 930877ae0f0d..8deec86ecbcd 100644
> >>> --- a/lib/utils.c
> >>> +++ b/lib/utils.c
> >>> @@ -1763,3 +1763,11 @@ int parse_on_off(const char *msg, const char *realval, int *p_err)
> >>>
> >>>  	return parse_one_of(msg, realval, values_on_off, ARRAY_SIZE(values_on_off), p_err);
> >>>  }
> >>> +
> >>> +void print_on_off_bool(FILE *fp, const char *flag, bool val)
> >>> +{
> >>> +	if (is_json_context())
> >>> +		print_bool(PRINT_JSON, flag, NULL, val);
> >>> +	else
> >>> +		fprintf(fp, "%s %s ", flag, val ? "on" : "off");
> >>> +}
> >>>
> >>
> >> I think print_on_off should be fine and aligns with parse_on_off once it
> >> returns a bool.
> >
> > print_on_off() is already used in the RDMA tool, and actually outputs
> > "on" and "off", unlike this. So I chose this instead.
> >
> > I could rename the RDMA one though -- it's used in two places, whereas
> > this is used in about two dozen instances across the codebase.
> >
>
> yes, the rdma utils are using generic function names. The rdma version
> should be renamed; perhaps rd_print_on_off. That seems to be once common
> prefix. Added Leon.

I made fast experiment and the output for the code proposed here and existed
in the RDMAtool - result the same. So the good thing will be to delete the
function from the RDMA after print_on_off_bool() will be improved.

However I don't understand why print_on_off_bool() is implemented in
utils.c and not in lib/json_print.c that properly handles JSON context,
provide colorized output and doesn't require to supply FILE *fp.

Thanks