Blame tc/q_taprio.c

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/*
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 * q_taprio.c	Time Aware Priority Scheduler
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 *
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 *		This program is free software; you can redistribute it and/or
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 *		modify it under the terms of the GNU General Public License
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 *		as published by the Free Software Foundation; either version
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 *		2 of the License, or (at your option) any later version.
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 *
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 * Authors:	Vinicius Costa Gomes <vinicius.gomes@intel.com>
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 * 		Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include "utils.h"
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#include "tc_util.h"
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#include "list.h"
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struct sched_entry {
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	struct list_head list;
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	uint32_t index;
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	uint32_t interval;
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	uint32_t gatemask;
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	uint8_t cmd;
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};
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#define CLOCKID_INVALID (-1)
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static const struct static_clockid {
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	const char *name;
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	clockid_t clockid;
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} clockids_sysv[] = {
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	{ "REALTIME", CLOCK_REALTIME },
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	{ "TAI", CLOCK_TAI },
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	{ "BOOTTIME", CLOCK_BOOTTIME },
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	{ "MONOTONIC", CLOCK_MONOTONIC },
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	{ NULL }
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};
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static void explain(void)
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{
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	fprintf(stderr,
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		"Usage: ... taprio clockid CLOCKID\n"
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		"		[num_tc NUMBER] [map P0 P1 ...] "
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		"		[queues COUNT@OFFSET COUNT@OFFSET COUNT@OFFSET ...] "
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		"		[ [sched-entry index cmd gate-mask interval] ... ] "
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		"		[base-time time] [txtime-delay delay]"
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		"\n"
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		"CLOCKID must be a valid SYS-V id (i.e. CLOCK_TAI)\n");
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}
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static void explain_clockid(const char *val)
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{
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	fprintf(stderr, "taprio: illegal value for \"clockid\": \"%s\".\n", val);
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	fprintf(stderr, "It must be a valid SYS-V id (i.e. CLOCK_TAI)\n");
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}
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static int get_clockid(__s32 *val, const char *arg)
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{
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	const struct static_clockid *c;
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	/* Drop the CLOCK_ prefix if that is being used. */
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	if (strcasestr(arg, "CLOCK_") != NULL)
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		arg += sizeof("CLOCK_") - 1;
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	for (c = clockids_sysv; c->name; c++) {
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		if (strcasecmp(c->name, arg) == 0) {
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			*val = c->clockid;
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			return 0;
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		}
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	}
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	return -1;
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}
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static const char* get_clock_name(clockid_t clockid)
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{
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	const struct static_clockid *c;
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	for (c = clockids_sysv; c->name; c++) {
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		if (clockid == c->clockid)
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			return c->name;
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	}
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	return "invalid";
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}
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static const char *entry_cmd_to_str(__u8 cmd)
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{
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	switch (cmd) {
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	case TC_TAPRIO_CMD_SET_GATES:
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		return "S";
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	default:
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		return "Invalid";
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	}
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}
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static int str_to_entry_cmd(const char *str)
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{
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	if (strcmp(str, "S") == 0)
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		return TC_TAPRIO_CMD_SET_GATES;
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	return -1;
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}
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static int add_sched_list(struct list_head *sched_entries, struct nlmsghdr *n)
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{
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	struct sched_entry *e;
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	list_for_each_entry(e, sched_entries, list) {
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		struct rtattr *a;
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		a = addattr_nest(n, 1024, TCA_TAPRIO_SCHED_ENTRY);
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		addattr_l(n, 1024, TCA_TAPRIO_SCHED_ENTRY_CMD, &e->cmd, sizeof(e->cmd));
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		addattr_l(n, 1024, TCA_TAPRIO_SCHED_ENTRY_GATE_MASK, &e->gatemask, sizeof(e->gatemask));
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		addattr_l(n, 1024, TCA_TAPRIO_SCHED_ENTRY_INTERVAL, &e->interval, sizeof(e->interval));
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		addattr_nest_end(n, a);
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	}
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	return 0;
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}
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static void explain_sched_entry(void)
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{
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	fprintf(stderr, "Usage: ... taprio ... sched-entry <cmd> <gate mask> <interval>\n");
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}
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static struct sched_entry *create_entry(uint32_t gatemask, uint32_t interval, uint8_t cmd)
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{
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	struct sched_entry *e;
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	e = calloc(1, sizeof(*e));
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	if (!e)
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		return NULL;
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	e->gatemask = gatemask;
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	e->interval = interval;
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	e->cmd = cmd;
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	return e;
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}
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static int taprio_parse_opt(struct qdisc_util *qu, int argc,
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			    char **argv, struct nlmsghdr *n, const char *dev)
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{
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	__s32 clockid = CLOCKID_INVALID;
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	struct tc_mqprio_qopt opt = { };
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	__s64 cycle_time_extension = 0;
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	struct list_head sched_entries;
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	struct rtattr *tail, *l;
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	__u32 taprio_flags = 0;
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	__u32 txtime_delay = 0;
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	__s64 cycle_time = 0;
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	__s64 base_time = 0;
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	int err, idx;
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	INIT_LIST_HEAD(&sched_entries);
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	while (argc > 0) {
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		idx = 0;
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		if (strcmp(*argv, "num_tc") == 0) {
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			NEXT_ARG();
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			if (get_u8(&opt.num_tc, *argv, 10)) {
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				fprintf(stderr, "Illegal \"num_tc\"\n");
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				return -1;
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			}
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		} else if (strcmp(*argv, "map") == 0) {
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			while (idx < TC_QOPT_MAX_QUEUE && NEXT_ARG_OK()) {
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				NEXT_ARG();
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				if (get_u8(&opt.prio_tc_map[idx], *argv, 10)) {
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					PREV_ARG();
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					break;
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				}
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				idx++;
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			}
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			for ( ; idx < TC_QOPT_MAX_QUEUE; idx++)
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				opt.prio_tc_map[idx] = 0;
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		} else if (strcmp(*argv, "queues") == 0) {
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			char *tmp, *tok;
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			while (idx < TC_QOPT_MAX_QUEUE && NEXT_ARG_OK()) {
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				NEXT_ARG();
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				tmp = strdup(*argv);
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				if (!tmp)
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					break;
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				tok = strtok(tmp, "@");
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				if (get_u16(&opt.count[idx], tok, 10)) {
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					free(tmp);
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					PREV_ARG();
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					break;
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				}
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				tok = strtok(NULL, "@");
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				if (get_u16(&opt.offset[idx], tok, 10)) {
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					free(tmp);
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					PREV_ARG();
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					break;
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				}
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				free(tmp);
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				idx++;
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			}
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		} else if (strcmp(*argv, "sched-entry") == 0) {
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			uint32_t mask, interval;
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			struct sched_entry *e;
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			uint8_t cmd;
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			NEXT_ARG();
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			err = str_to_entry_cmd(*argv);
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			if (err < 0) {
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				explain_sched_entry();
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				return  -1;
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			}
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			cmd = err;
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			NEXT_ARG();
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			if (get_u32(&mask, *argv, 16)) {
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				explain_sched_entry();
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				return -1;
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			}
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			NEXT_ARG();
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			if (get_u32(&interval, *argv, 0)) {
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				explain_sched_entry();
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				return -1;
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			}
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			e = create_entry(mask, interval, cmd);
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			if (!e) {
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				fprintf(stderr, "taprio: not enough memory for new schedule entry\n");
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				return -1;
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			}
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			list_add_tail(&e->list, &sched_entries);
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		} else if (strcmp(*argv, "base-time") == 0) {
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			NEXT_ARG();
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			if (get_s64(&base_time, *argv, 10)) {
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				PREV_ARG();
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				break;
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			}
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		} else if (strcmp(*argv, "cycle-time") == 0) {
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			NEXT_ARG();
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			if (cycle_time) {
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				fprintf(stderr, "taprio: duplicate \"cycle-time\" specification\n");
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				return -1;
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			}
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			if (get_s64(&cycle_time, *argv, 10)) {
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				PREV_ARG();
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				break;
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			}
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		} else if (strcmp(*argv, "cycle-time-extension") == 0) {
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			NEXT_ARG();
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			if (cycle_time_extension) {
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				fprintf(stderr, "taprio: duplicate \"cycle-time-extension\" specification\n");
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				return -1;
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			}
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			if (get_s64(&cycle_time_extension, *argv, 10)) {
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				PREV_ARG();
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				break;
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			}
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		} else if (strcmp(*argv, "clockid") == 0) {
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			NEXT_ARG();
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			if (clockid != CLOCKID_INVALID) {
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				fprintf(stderr, "taprio: duplicate \"clockid\" specification\n");
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				return -1;
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			}
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			if (get_clockid(&clockid, *argv)) {
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				explain_clockid(*argv);
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				return -1;
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			}
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		} else if (strcmp(*argv, "flags") == 0) {
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			NEXT_ARG();
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			if (taprio_flags) {
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				fprintf(stderr, "taprio: duplicate \"flags\" specification\n");
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				return -1;
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			}
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			if (get_u32(&taprio_flags, *argv, 0)) {
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				PREV_ARG();
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				return -1;
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			}
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		} else if (strcmp(*argv, "txtime-delay") == 0) {
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			NEXT_ARG();
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			if (txtime_delay != 0) {
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				fprintf(stderr, "taprio: duplicate \"txtime-delay\" specification\n");
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				return -1;
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			}
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			if (get_u32(&txtime_delay, *argv, 0)) {
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				PREV_ARG();
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				return -1;
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			}
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		} else if (strcmp(*argv, "help") == 0) {
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			explain();
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			return -1;
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		} else {
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			fprintf(stderr, "Unknown argument\n");
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			return -1;
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		}
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		argc--; argv++;
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	}
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	tail = NLMSG_TAIL(n);
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	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
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	if (clockid != CLOCKID_INVALID)
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		addattr_l(n, 1024, TCA_TAPRIO_ATTR_SCHED_CLOCKID, &clockid, sizeof(clockid));
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	if (taprio_flags)
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		addattr_l(n, 1024, TCA_TAPRIO_ATTR_FLAGS, &taprio_flags, sizeof(taprio_flags));
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	if (opt.num_tc > 0)
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		addattr_l(n, 1024, TCA_TAPRIO_ATTR_PRIOMAP, &opt, sizeof(opt));
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	if (txtime_delay)
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		addattr_l(n, 1024, TCA_TAPRIO_ATTR_TXTIME_DELAY, &txtime_delay, sizeof(txtime_delay));
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	if (base_time)
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		addattr_l(n, 1024, TCA_TAPRIO_ATTR_SCHED_BASE_TIME, &base_time, sizeof(base_time));
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	if (cycle_time)
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		addattr_l(n, 1024, TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME,
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			  &cycle_time, sizeof(cycle_time));
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	if (cycle_time_extension)
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		addattr_l(n, 1024, TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION,
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			  &cycle_time_extension, sizeof(cycle_time_extension));
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	l = addattr_nest(n, 1024, TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST | NLA_F_NESTED);
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	err = add_sched_list(&sched_entries, n);
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	if (err < 0) {
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		fprintf(stderr, "Could not add schedule to netlink message\n");
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		return -1;
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	}
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	addattr_nest_end(n, l);
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	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
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	return 0;
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}
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static int print_sched_list(FILE *f, struct rtattr *list)
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{
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	struct rtattr *item;
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	int rem;
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	if (list == NULL)
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		return 0;
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	rem = RTA_PAYLOAD(list);
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	open_json_array(PRINT_JSON, "schedule");
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	print_nl();
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	for (item = RTA_DATA(list); RTA_OK(item, rem); item = RTA_NEXT(item, rem)) {
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		struct rtattr *tb[TCA_TAPRIO_SCHED_ENTRY_MAX + 1];
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		__u32 index = 0, gatemask = 0, interval = 0;
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		__u8 command = 0;
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		parse_rtattr_nested(tb, TCA_TAPRIO_SCHED_ENTRY_MAX, item);
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		if (tb[TCA_TAPRIO_SCHED_ENTRY_INDEX])
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			index = rta_getattr_u32(tb[TCA_TAPRIO_SCHED_ENTRY_INDEX]);
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		if (tb[TCA_TAPRIO_SCHED_ENTRY_CMD])
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			command = rta_getattr_u8(tb[TCA_TAPRIO_SCHED_ENTRY_CMD]);
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		if (tb[TCA_TAPRIO_SCHED_ENTRY_GATE_MASK])
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			gatemask = rta_getattr_u32(tb[TCA_TAPRIO_SCHED_ENTRY_GATE_MASK]);
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		if (tb[TCA_TAPRIO_SCHED_ENTRY_INTERVAL])
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			interval = rta_getattr_u32(tb[TCA_TAPRIO_SCHED_ENTRY_INTERVAL]);
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		open_json_object(NULL);
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		print_uint(PRINT_ANY, "index", "\tindex %u", index);
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		print_string(PRINT_ANY, "cmd", " cmd %s", entry_cmd_to_str(command));
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		print_0xhex(PRINT_ANY, "gatemask", " gatemask %#llx", gatemask);
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		print_uint(PRINT_ANY, "interval", " interval %u", interval);
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		close_json_object();
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		print_nl();
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	}
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	close_json_array(PRINT_ANY, "");
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	return 0;
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}
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static int print_schedule(FILE *f, struct rtattr **tb)
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{
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	int64_t base_time = 0, cycle_time = 0, cycle_time_extension = 0;
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	if (tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME])
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		base_time = rta_getattr_s64(tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME]);
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	if (tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME])
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		cycle_time = rta_getattr_s64(tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME]);
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	if (tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION])
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		cycle_time_extension = rta_getattr_s64(
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			tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION]);
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	print_lluint(PRINT_ANY, "base_time", "\tbase-time %lld", base_time);
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	print_lluint(PRINT_ANY, "cycle_time", " cycle-time %lld", cycle_time);
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	print_lluint(PRINT_ANY, "cycle_time_extension",
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		     " cycle-time-extension %lld", cycle_time_extension);
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	print_sched_list(f, tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST]);
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	return 0;
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}
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static int taprio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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{
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	struct rtattr *tb[TCA_TAPRIO_ATTR_MAX + 1];
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	struct tc_mqprio_qopt *qopt = 0;
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	__s32 clockid = CLOCKID_INVALID;
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	int i;
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	if (opt == NULL)
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		return 0;
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	parse_rtattr_nested(tb, TCA_TAPRIO_ATTR_MAX, opt);
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	if (tb[TCA_TAPRIO_ATTR_PRIOMAP] == NULL)
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		return -1;
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	qopt = RTA_DATA(tb[TCA_TAPRIO_ATTR_PRIOMAP]);
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	print_uint(PRINT_ANY, "tc", "tc %u ", qopt->num_tc);
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	open_json_array(PRINT_ANY, "map");
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	for (i = 0; i <= TC_PRIO_MAX; i++)
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		print_uint(PRINT_ANY, NULL, " %u", qopt->prio_tc_map[i]);
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	close_json_array(PRINT_ANY, "");
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	print_nl();
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	open_json_array(PRINT_ANY, "queues");
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	for (i = 0; i < qopt->num_tc; i++) {
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		open_json_object(NULL);
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		print_uint(PRINT_ANY, "offset", " offset %u", qopt->offset[i]);
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		print_uint(PRINT_ANY, "count", " count %u", qopt->count[i]);
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		close_json_object();
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	}
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	close_json_array(PRINT_ANY, "");
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	print_nl();
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	if (tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID])
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		clockid = rta_getattr_s32(tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]);
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	print_string(PRINT_ANY, "clockid", "clockid %s", get_clock_name(clockid));
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	if (tb[TCA_TAPRIO_ATTR_FLAGS]) {
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		__u32 flags;
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		flags = rta_getattr_u32(tb[TCA_TAPRIO_ATTR_FLAGS]);
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		print_0xhex(PRINT_ANY, "flags", " flags %#x", flags);
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	}
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	if (tb[TCA_TAPRIO_ATTR_TXTIME_DELAY]) {
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		__u32 txtime_delay;
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		txtime_delay = rta_getattr_s32(tb[TCA_TAPRIO_ATTR_TXTIME_DELAY]);
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		print_uint(PRINT_ANY, "txtime_delay", " txtime delay %d", txtime_delay);
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	}
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	print_schedule(f, tb);
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	if (tb[TCA_TAPRIO_ATTR_ADMIN_SCHED]) {
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		struct rtattr *t[TCA_TAPRIO_ATTR_MAX + 1];
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		parse_rtattr_nested(t, TCA_TAPRIO_ATTR_MAX,
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				    tb[TCA_TAPRIO_ATTR_ADMIN_SCHED]);
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		open_json_object(NULL);
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		print_schedule(f, t);
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		close_json_object();
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	}
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	return 0;
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}
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struct qdisc_util taprio_qdisc_util = {
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	.id		= "taprio",
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	.parse_qopt	= taprio_parse_opt,
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	.print_qopt	= taprio_print_opt,
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};