netdev - Re: [PATCH iproute2] etf: make printing of variable JSON friendly

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Date:   Tue, 23 Jul 2019 21:34:46 +0000
From:   "Patel, Vedang" <vedang.patel@...el.com>
To:     David Ahern <dsahern@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "Gomes, Vinicius" <vinicius.gomes@...el.com>,
        "Dorileo, Leandro" <leandro.maciel.dorileo@...el.com>
Subject: Re: [PATCH iproute2] etf: make printing of variable JSON friendly



> On Jul 22, 2019, at 5:11 PM, David Ahern <dsahern@...il.com> wrote:
> 
> On 7/22/19 1:11 PM, Patel, Vedang wrote:
>> 
>> 
>>> On Jul 22, 2019, at 11:21 AM, David Ahern <dsahern@...il.com> wrote:
>>> 
>>> On 7/19/19 3:40 PM, Vedang Patel wrote:
>>>> In iproute2 txtime-assist series, it was pointed out that print_bool()
>>>> should be used to print binary values. This is to make it JSON friendly.
>>>> 
>>>> So, make the corresponding changes in ETF.
>>>> 
>>>> Fixes: 8ccd49383cdc ("etf: Add skip_sock_check")
>>>> Reported-by: Stephen Hemminger <stephen@...workplumber.org>
>>>> Signed-off-by: Vedang Patel <vedang.patel@...el.com>
>>>> ---
>>>> tc/q_etf.c | 12 ++++++------
>>>> 1 file changed, 6 insertions(+), 6 deletions(-)
>>>> 
>>>> diff --git a/tc/q_etf.c b/tc/q_etf.c
>>>> index c2090589bc64..307c50eed48b 100644
>>>> --- a/tc/q_etf.c
>>>> +++ b/tc/q_etf.c
>>>> @@ -176,12 +176,12 @@ static int etf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
>>>> 		     get_clock_name(qopt->clockid));
>>>> 
>>>> 	print_uint(PRINT_ANY, "delta", "delta %d ", qopt->delta);
>>>> -	print_string(PRINT_ANY, "offload", "offload %s ",
>>>> -				(qopt->flags & TC_ETF_OFFLOAD_ON) ? "on" : "off");
>>>> -	print_string(PRINT_ANY, "deadline_mode", "deadline_mode %s ",
>>>> -				(qopt->flags & TC_ETF_DEADLINE_MODE_ON) ? "on" : "off");
>>>> -	print_string(PRINT_ANY, "skip_sock_check", "skip_sock_check %s",
>>>> -				(qopt->flags & TC_ETF_SKIP_SOCK_CHECK) ? "on" : "off");
>>>> +	if (qopt->flags & TC_ETF_OFFLOAD_ON)
>>>> +		print_bool(PRINT_ANY, "offload", "offload ", true);
>>>> +	if (qopt->flags & TC_ETF_DEADLINE_MODE_ON)
>>>> +		print_bool(PRINT_ANY, "deadline_mode", "deadline_mode ", true);
>>>> +	if (qopt->flags & TC_ETF_SKIP_SOCK_CHECK)
>>>> +		print_bool(PRINT_ANY, "skip_sock_check", "skip_sock_check", true);
>>>> 
>>>> 	return 0;
>>>> }
>>>> 
>>> 
>>> This changes existing output for TC_ETF_OFFLOAD_ON and
>>> TC_ETF_DEADLINE_MODE_ON which were added a year ago.
>> Yes, this is a good point. I missed that. 
>> 
>> Another idea is to use is_json_context() and call print_bool() there. But, that will still change values corresponding to the json output for the above flags from “on”/“off” to “true”/“false”. I am not sure if this is a big issue. 
>> 
>> My suggestion is to keep the code as is. what do you think?
>> 
> 
> I think we need automated checkers for new code. ;-)
> 
> The first 2 should not change for backward compatibility - unless there
> is agreement that this feature is too new and long term it is better to
> print as above.
> 
> Then the new one should follow context of the other 2 - consistency IMHO
> takes precedence.
Thanks for the inputs. 

Let’s keep whatever is currently present upstream and you can ignore this patch.

Thanks,
Vedang