/*

 * q_drr.c		DRR.

 *

 *		This program is free software; you can redistribute it and/or

 *		modify it under the terms of the GNU General Public License

 *		as published by the Free Software Foundation; either version

 *		2 of the License, or (at your option) any later version.

 *

 * Authors:	Patrick McHardy <kaber@trash.net>

 *

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <string.h>

#include "utils.h"

#include "tc_util.h"

static void explain(void)

{

	fprintf(stderr, "Usage: ... drr\n");

}

static void explain2(void)

{

	fprintf(stderr, "Usage: ... drr quantum SIZE\n");

}

static int drr_parse_opt(struct qdisc_util *qu, int argc, char **argv,

			 struct nlmsghdr *n, const char *dev)

{

	while (argc) {

		if (strcmp(*argv, "help") == 0) {

			explain();

			return -1;

		} else {

			fprintf(stderr, "What is \"%s\"?\n", *argv);

			explain();

			return -1;

		}

	}

	return 0;

}

static int drr_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,

			       struct nlmsghdr *n, const char *dev)

{

	struct rtattr *tail;

	__u32 tmp;

	tail = addattr_nest(n, 1024, TCA_OPTIONS);

	while (argc > 0) {

		if (strcmp(*argv, "quantum") == 0) {

			NEXT_ARG();

			if (get_size(&tmp, *argv)) {

				fprintf(stderr, "Illegal \"quantum\"\n");

				return -1;

			}

			addattr_l(n, 1024, TCA_DRR_QUANTUM, &tmp, sizeof(tmp));

		} else if (strcmp(*argv, "help") == 0) {

			explain2();

			return -1;

		} else {

			fprintf(stderr, "What is \"%s\"?\n", *argv);

			explain2();

			return -1;

		}

		argc--; argv++;

	}

	addattr_nest_end(n, tail);

	return 0;

}

static int drr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)

{

	struct rtattr *tb[TCA_DRR_MAX + 1];

	SPRINT_BUF(b1);

	if (opt == NULL)

		return 0;

	parse_rtattr_nested(tb, TCA_DRR_MAX, opt);

	if (tb[TCA_DRR_QUANTUM])

		fprintf(f, "quantum %s ",

			sprint_size(rta_getattr_u32(tb[TCA_DRR_QUANTUM]), b1));

	return 0;

}

static int drr_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)

{

	struct tc_drr_stats *x;

	SPRINT_BUF(b1);

	if (xstats == NULL)

		return 0;

	if (RTA_PAYLOAD(xstats) < sizeof(*x))

		return -1;

	x = RTA_DATA(xstats);

	fprintf(f, " deficit %s ", sprint_size(x->deficit, b1));

	return 0;

}

struct qdisc_util drr_qdisc_util = {

	.id		= "drr",

	.parse_qopt	= drr_parse_opt,

	.print_qopt	= drr_print_opt,

	.print_xstats	= drr_print_xstats,

	.parse_copt	= drr_parse_class_opt,

	.print_copt	= drr_print_opt,

};