/*

 * q_fifo.c		FIFO.

 *

 *		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:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>

 *

 */

#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: ... <[p|b]fifo | pfifo_head_drop> [ limit NUMBER ]\n");

}

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

			  struct nlmsghdr *n, const char *dev)

{

	int ok = 0;

	struct tc_fifo_qopt opt = {};

	while (argc > 0) {

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

			NEXT_ARG();

			if (get_size(&opt.limit, *argv)) {

				fprintf(stderr, "%s: Illegal value for \"limit\": \"%s\"\n", qu->id, *argv);

				return -1;

			}

			ok++;

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

			explain();

			return -1;

		} else {

			fprintf(stderr, "%s: unknown parameter \"%s\"\n", qu->id, *argv);

			explain();

			return -1;

		}

		argc--; argv++;

	}

	if (ok)

		addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));

	return 0;

}

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

{

	struct tc_fifo_qopt *qopt;

	if (opt == NULL)

		return 0;

	if (RTA_PAYLOAD(opt)  < sizeof(*qopt))

		return -1;

	qopt = RTA_DATA(opt);

	if (strcmp(qu->id, "bfifo") == 0) {

		SPRINT_BUF(b1);

		print_uint(PRINT_JSON, "limit", NULL, qopt->limit);

		print_string(PRINT_FP, NULL, "limit %s",

			     sprint_size(qopt->limit, b1));

	} else {

		print_uint(PRINT_ANY, "limit", "limit %up", qopt->limit);

	}

	return 0;

}

struct qdisc_util bfifo_qdisc_util = {

	.id = "bfifo",

	.parse_qopt = fifo_parse_opt,

	.print_qopt = fifo_print_opt,

};

struct qdisc_util pfifo_qdisc_util = {

	.id = "pfifo",

	.parse_qopt = fifo_parse_opt,

	.print_qopt = fifo_print_opt,

};

struct qdisc_util pfifo_head_drop_qdisc_util = {

	.id = "pfifo_head_drop",

	.parse_qopt = fifo_parse_opt,

	.print_qopt = fifo_print_opt,

};

struct qdisc_util pfifo_fast_qdisc_util = {

	.id = "pfifo_fast",

	.print_qopt = prio_print_opt,

};