netdev - Re: [RFC iproute2-next v1 5/5] tc: Add support for configuring the taprio scheduler

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Date:   Sat, 14 Jul 2018 12:19:21 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, jesus.sanchez-palencia@...el.com
Subject: Re: [RFC iproute2-next v1 5/5] tc: Add support for configuring the
 taprio scheduler

On Fri, 13 Jul 2018 17:06:11 -0700
Vinicius Costa Gomes <vinicius.gomes@...el.com> wrote:

> +	while (fscanf(f, "%ms %x %" PRIu32 "\n", &cmd_str, &gatemask, &interval) != EOF)  {
> +		struct rtattr *entry;
> +
> +		err = str_to_entry_cmd(cmd_str);
> +		free(cmd_str);
> +
> +		if (err < 0)
> +			return err;
> +
> +		cmd = err;
> +
> +		entry = addattr_nest(n, 1024, TCA_TAPRIO_SCHED_ENTRY);
> +
> +		addattr_l(n, 1024, TCA_TAPRIO_SCHED_ENTRY_INDEX, &index, sizeof(index));
> +		addattr_l(n, 1024, TCA_TAPRIO_SCHED_ENTRY_CMD, &cmd, sizeof(cmd));
> +		addattr_l(n, 1024, TCA_TAPRIO_SCHED_ENTRY_GATE_MASK, &gatemask, sizeof(gatemask));
> +		addattr_l(n, 1024, TCA_TAPRIO_SCHED_ENTRY_INTERVAL, &interval, sizeof(interval));
> +
> +		addattr_nest_end(n, entry);
> +	}
> +

Why not just use batch mode? Introducing another input mode in tc that is
only in one qdisc seems like a bad idea.

> +
> +static int taprio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
> +{
> +	struct rtattr *tb[TCA_TAPRIO_ATTR_MAX + 1];
> +	struct tc_mqprio_qopt *qopt = 0;
> +	__s64 cycle_time = 0, extension_time = 0, base_time = 0;
> +	__s32 clockid = CLOCKID_INVALID;
> +	__u32 preempt_mask = 0;
> +	int i;
> +
> +	if (opt == NULL)
> +		return 0;
> +
> +	parse_rtattr_nested(tb, TCA_TAPRIO_ATTR_MAX, opt);
> +
> +	if (tb[TCA_TAPRIO_ATTR_PRIOMAP] == NULL)
> +		return -1;
> +
> +	qopt = RTA_DATA(tb[TCA_TAPRIO_ATTR_PRIOMAP]);
> +
> +	fprintf(f, "tc %u map ", qopt->num_tc);
> +	for (i = 0; i <= TC_PRIO_MAX; i++)
> +		fprintf(f, "%u ", qopt->prio_tc_map[i]);
> +	fprintf(f, "\n	queues:");
> +	for (i = 0; i < qopt->num_tc; i++)
> +		fprintf(f, "(%u:%u) ", qopt->offset[i],
> +			qopt->offset[i] + qopt->count[i] - 1);
> +
> +	if (tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME])
> +		cycle_time = rta_getattr_s64(tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME]);
> +
> +	if (tb[TCA_TAPRIO_ATTR_SCHED_EXTENSION_TIME])
> +		extension_time = rta_getattr_s64(tb[TCA_TAPRIO_ATTR_SCHED_EXTENSION_TIME]);
> +
> +	if (tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME])
> +		base_time = rta_getattr_s64(tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME]);
> +
> +	if (tb[TCA_TAPRIO_ATTR_PREEMPT_MASK])
> +		preempt_mask = rta_getattr_s64(tb[TCA_TAPRIO_ATTR_PREEMPT_MASK]);
> +
> +	if (tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID])
> +		clockid = rta_getattr_s32(tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]);
> +
> +	fprintf(f, "\n	clockid %s ", get_clock_name(clockid));
> +
> +	fprintf(f, "\n	base-time %lld cycle-time %lld extension-time %lld ",
> +		base_time, cycle_time, extension_time);
> +
> +	fprintf(f, "\n	preempt-mask 0x%x ", preempt_mask);
> +
> +	return print_sched_list(f, tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST]);


Please implement JSON output using json_print functions.