netdev - Re: [PATCH iproute2-next] iproute2 Support lockless token bucket (LTB)

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Date:   Tue, 07 Jul 2020 03:54:38 +0800
From:   "YU, Xiangning" <xiangning.yu@...baba-inc.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next] iproute2 Support lockless token bucket
 (LTB)

On 7/6/20 11:40 AM, Stephen Hemminger wrote:
> On Tue, 07 Jul 2020 02:08:21 +0800
> "YU, Xiangning" <xiangning.yu@...baba-inc.com> wrote:
> 
>> +static int ltb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
>> +{
>> +	struct rtattr *tb[TCA_LTB_MAX + 1];
>> +	struct tc_ltb_opt *lopt;
>> +	struct tc_ltb_glob *gopt;
>> +	__u64 rate64, ceil64;
>> +
>> +	SPRINT_BUF(b1);
>> +	if (opt == NULL)
>> +		return 0;
>> +
>> +	parse_rtattr_nested(tb, TCA_LTB_MAX, opt);
>> +
>> +	if (tb[TCA_LTB_PARMS]) {
>> +		lopt = RTA_DATA(tb[TCA_LTB_PARMS]);
>> +		if (RTA_PAYLOAD(tb[TCA_LTB_PARMS])  < sizeof(*lopt))
>> +			return -1;
>> +
>> +		fprintf(f, "prio %d ", (int)lopt->prio);
>> +
>> +		rate64 = lopt->rate.rate;
>> +		if (tb[TCA_LTB_RATE64] &&
>> +		    RTA_PAYLOAD(tb[TCA_LTB_RATE64]) >= sizeof(rate64)) {
>> +			rate64 = *(__u64 *)RTA_DATA(tb[TCA_LTB_RATE64]);
>> +		}
>> +
>> +		ceil64 = lopt->ceil.rate;
>> +		if (tb[TCA_LTB_CEIL64] &&
>> +		    RTA_PAYLOAD(tb[TCA_LTB_CEIL64]) >= sizeof(ceil64))
>> +			ceil64 = *(__u64 *)RTA_DATA(tb[TCA_LTB_CEIL64]);
>> +
>> +		fprintf(f, "rate %s ", sprint_rate(rate64, b1));
>> +		fprintf(f, "ceil %s ", sprint_rate(ceil64, b1));
> 
> The print function needs to support JSON output like the rest
> of the qdisc in current iproute2.
> 
Hi Stephen,

Thank you for pointing this out! While I'm a bit confused about the JSON output. This is a sample output of `tc -j class show` command. Looks like it doesn't display JSON output even for HTB. Am I missing anything? 

# ./tc -s  -j -p class show dev enp7s0f0
class htb 1:1 root rate 10Gbit ceil 10Gbit burst 13750b cburst 0b 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: 187 ctokens: 15

class htb 1:10 parent 1:1 prio 1 rate 10Gbit ceil 10Gbit burst 13750b cburst 13750b 
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: 187 ctokens: 187

Thanks,
- Xiangning