/*

 * q_etf.c		Earliest TxTime First (ETF).

 *

 *		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:	Vinicius Costa Gomes <vinicius.gomes@intel.com>

 *		Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>

 *

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <string.h>

#include "utils.h"

#include "tc_util.h"

#define CLOCKID_INVALID (-1)

static const struct static_clockid {

	const char *name;

	clockid_t clockid;

} clockids_sysv[] = {

	{ "REALTIME", CLOCK_REALTIME },

	{ "TAI", CLOCK_TAI },

	{ "BOOTTIME", CLOCK_BOOTTIME },

	{ "MONOTONIC", CLOCK_MONOTONIC },

	{ NULL }

};

static void explain(void)

{

	fprintf(stderr,

		"Usage: ... etf delta NANOS clockid CLOCKID [offload] [deadline_mode]\n"

		"CLOCKID must be a valid SYS-V id (i.e. CLOCK_TAI)\n");

}

static void explain1(const char *arg, const char *val)

{

	fprintf(stderr, "etf: illegal value for \"%s\": \"%s\"\n", arg, val);

}

static void explain_clockid(const char *val)

{

	fprintf(stderr,

		"etf: illegal value for \"clockid\": \"%s\".\n"

		"It must be a valid SYS-V id (i.e. CLOCK_TAI)\n",

		val);

}

static int get_clockid(__s32 *val, const char *arg)

{

	const struct static_clockid *c;

	/* Drop the CLOCK_ prefix if that is being used. */

	if (strcasestr(arg, "CLOCK_") != NULL)

		arg += sizeof("CLOCK_") - 1;

	for (c = clockids_sysv; c->name; c++) {

		if (strcasecmp(c->name, arg) == 0) {

			*val = c->clockid;

			return 0;

		}

	}

	return -1;

}

static const char* get_clock_name(clockid_t clockid)

{

	const struct static_clockid *c;

	for (c = clockids_sysv; c->name; c++) {

		if (clockid == c->clockid)

			return c->name;

	}

	return "invalid";

}

static int etf_parse_opt(struct qdisc_util *qu, int argc,

			 char **argv, struct nlmsghdr *n, const char *dev)

{

	struct tc_etf_qopt opt = {

		.clockid = CLOCKID_INVALID,

	};

	struct rtattr *tail;

	while (argc > 0) {

		if (matches(*argv, "offload") == 0) {

			if (opt.flags & TC_ETF_OFFLOAD_ON) {

				fprintf(stderr, "etf: duplicate \"offload\" specification\n");

				return -1;

			}

			opt.flags |= TC_ETF_OFFLOAD_ON;

		} else if (matches(*argv, "deadline_mode") == 0) {

			if (opt.flags & TC_ETF_DEADLINE_MODE_ON) {

				fprintf(stderr, "etf: duplicate \"deadline_mode\" specification\n");

				return -1;

			}

			opt.flags |= TC_ETF_DEADLINE_MODE_ON;

		} else if (matches(*argv, "delta") == 0) {

			NEXT_ARG();

			if (opt.delta) {

				fprintf(stderr, "etf: duplicate \"delta\" specification\n");

				return -1;

			}

			if (get_s32(&opt.delta, *argv, 0)) {

				explain1("delta", *argv);

				return -1;

			}

		} else if (matches(*argv, "clockid") == 0) {

			NEXT_ARG();

			if (opt.clockid != CLOCKID_INVALID) {

				fprintf(stderr, "etf: duplicate \"clockid\" specification\n");

				return -1;

			}

			if (get_clockid(&opt.clockid, *argv)) {

				explain_clockid(*argv);

				return -1;

			}

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

			explain();

			return -1;

		} else {

			fprintf(stderr, "etf: unknown parameter \"%s\"\n", *argv);

			explain();

			return -1;

		}

		argc--; argv++;

	}

	tail = NLMSG_TAIL(n);

	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);

	addattr_l(n, 2024, TCA_ETF_PARMS, &opt, sizeof(opt));

	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;

	return 0;

}

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

{

	struct rtattr *tb[TCA_ETF_MAX+1];

	struct tc_etf_qopt *qopt;

	if (opt == NULL)

		return 0;

	parse_rtattr_nested(tb, TCA_ETF_MAX, opt);

	if (tb[TCA_ETF_PARMS] == NULL)

		return -1;

	qopt = RTA_DATA(tb[TCA_ETF_PARMS]);

	if (RTA_PAYLOAD(tb[TCA_ETF_PARMS])  < sizeof(*qopt))

		return -1;

	print_string(PRINT_ANY, "clockid", "clockid %s ",

		     get_clock_name(qopt->clockid));

	print_uint(PRINT_ANY, "delta", "delta %d ", qopt->delta);

	print_string(PRINT_ANY, "offload", "offload %s ",

				(qopt->flags & TC_ETF_OFFLOAD_ON) ? "on" : "off");

	print_string(PRINT_ANY, "deadline_mode", "deadline_mode %s",

				(qopt->flags & TC_ETF_DEADLINE_MODE_ON) ? "on" : "off");

	return 0;

}

struct qdisc_util etf_qdisc_util = {

	.id		= "etf",

	.parse_qopt	= etf_parse_opt,

	.print_qopt	= etf_print_opt,

};