tc/q_tbf.c - maze/iproute2 - Git at Google

 /*
  * q_tbf.c		TBF.
  *
  *		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 <syslog.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: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu BYTES[/BYTES] ]\n");
 	fprintf(stderr, "               [ peakrate KBPS ] [ latency TIME ] ");
 	fprintf(stderr, "[ overhead BYTES ] [ linklayer TYPE ]\n");
 }

 static void explain1(const char *arg, const char *val)
 {
 	fprintf(stderr, "tbf: illegal value for \"%s\": \"%s\"\n", arg, val);
 }


 static int tbf_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 {
 	int ok=0;
 	struct tc_tbf_qopt opt;
 	__u32 rtab[256];
 	__u32 ptab[256];
 	unsigned buffer=0, mtu=0, mpu=0, latency=0;
 	int Rcell_log=-1, Pcell_log = -1;
 	unsigned short overhead=0;
 	unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
 	struct rtattr *tail;
 	__u64 rate64 = 0, prate64 = 0;

 	memset(&opt, 0, sizeof(opt));

 	while (argc > 0) {
 		if (matches(*argv, "limit") == 0) {
 			NEXT_ARG();
 			if (opt.limit) {
 				fprintf(stderr, "tbf: duplicate \"limit\" specification\n");
 				return -1;
 			}
 			if (latency) {
 				fprintf(stderr, "tbf: specifying both \"latency\" and \"limit\" is not allowed\n");
 				return -1;
 			}
 			if (get_size(&opt.limit, *argv)) {
 				explain1("limit", *argv);
 				return -1;
 			}
 			ok++;
 		} else if (matches(*argv, "latency") == 0) {
 			NEXT_ARG();
 			if (latency) {
 				fprintf(stderr, "tbf: duplicate \"latency\" specification\n");
 				return -1;
 			}
 			if (opt.limit) {
 				fprintf(stderr, "tbf: specifying both \"limit\" and \"/latency\" is not allowed\n");
 				return -1;
 			}
 			if (get_time(&latency, *argv)) {
 				explain1("latency", *argv);
 				return -1;
 			}
 			ok++;
 		} else if (matches(*argv, "burst") == 0 ||
 			strcmp(*argv, "buffer") == 0 ||
 			strcmp(*argv, "maxburst") == 0) {
 			const char *parm_name = *argv;
 			NEXT_ARG();
 			if (buffer) {
 				fprintf(stderr, "tbf: duplicate \"buffer/burst/maxburst\" specification\n");
 				return -1;
 			}
 			if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
 				explain1(parm_name, *argv);
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "mtu") == 0 ||
 			   strcmp(*argv, "minburst") == 0) {
 			const char *parm_name = *argv;
 			NEXT_ARG();
 			if (mtu) {
 				fprintf(stderr, "tbf: duplicate \"mtu/minburst\" specification\n");
 				return -1;
 			}
 			if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
 				explain1(parm_name, *argv);
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "mpu") == 0) {
 			NEXT_ARG();
 			if (mpu) {
 				fprintf(stderr, "tbf: duplicate \"mpu\" specification\n");
 				return -1;
 			}
 			if (get_size(&mpu, *argv)) {
 				explain1("mpu", *argv);
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "rate") == 0) {
 			NEXT_ARG();
 			if (rate64) {
 				fprintf(stderr, "tbf: duplicate \"rate\" specification\n");
 				return -1;
 			}
 			if (get_rate64(&rate64, *argv)) {
 				explain1("rate", *argv);
 				return -1;
 			}
 			ok++;
 		} else if (matches(*argv, "peakrate") == 0) {
 			NEXT_ARG();
 			if (prate64) {
 				fprintf(stderr, "tbf: duplicate \"peakrate\" specification\n");
 				return -1;
 			}
 			if (get_rate64(&prate64, *argv)) {
 				explain1("peakrate", *argv);
 				return -1;
 			}
 			ok++;
 		} else if (matches(*argv, "overhead") == 0) {
 			NEXT_ARG();
 			if (overhead) {
 				fprintf(stderr, "tbf: duplicate \"overhead\" specification\n");
 				return -1;
 			}
 			if (get_u16(&overhead, *argv, 10)) {
 				explain1("overhead", *argv); return -1;
 			}
 		} else if (matches(*argv, "linklayer") == 0) {
 			NEXT_ARG();
 			if (get_linklayer(&linklayer, *argv)) {
 				explain1("linklayer", *argv); return -1;
 			}
 		} else if (strcmp(*argv, "help") == 0) {
 			explain();
 			return -1;
 		} else {
 			fprintf(stderr, "tbf: unknown parameter \"%s\"\n", *argv);
 			explain();
 			return -1;
 		}
 		argc--; argv++;
 	}

         int verdict = 0;

         /* Be nice to the user: try to emit all error messages in
          * one go rather than reveal one more problem when a
          * previous one has been fixed.
          */
 	if (rate64 == 0) {
 		fprintf(stderr, "tbf: the \"rate\" parameter is mandatory.\n");
 		verdict = -1;
 	}
 	if (!buffer) {
 		fprintf(stderr, "tbf: the \"burst\" parameter is mandatory.\n");
 		verdict = -1;
 	}
 	if (prate64) {
 		if (!mtu) {
 			fprintf(stderr, "tbf: when \"peakrate\" is specified, \"mtu\" must also be specified.\n");
 			verdict = -1;
 		}
 	}

 	if (opt.limit == 0 && latency == 0) {
 		fprintf(stderr, "tbf: either \"limit\" or \"latency\" is required.\n");
 		verdict = -1;
 	}

         if (verdict != 0) {
                 explain();
                 return verdict;
         }

 	opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64;
 	opt.peakrate.rate = (prate64 >= (1ULL << 32)) ? ~0U : prate64;

 	if (opt.limit == 0) {
 		double lim = rate64*(double)latency/TIME_UNITS_PER_SEC + buffer;
 		if (prate64) {
 			double lim2 = prate64*(double)latency/TIME_UNITS_PER_SEC + mtu;
 			if (lim2 < lim)
 				lim = lim2;
 		}
 		opt.limit = lim;
 	}

 	opt.rate.mpu      = mpu;
 	opt.rate.overhead = overhead;
 	if (tc_calc_rtable(&opt.rate, rtab, Rcell_log, mtu, linklayer) < 0) {
 		fprintf(stderr, "tbf: failed to calculate rate table.\n");
 		return -1;
 	}
 	opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);

 	if (opt.peakrate.rate) {
 		opt.peakrate.mpu      = mpu;
 		opt.peakrate.overhead = overhead;
 		if (tc_calc_rtable(&opt.peakrate, ptab, Pcell_log, mtu, linklayer) < 0) {
 			fprintf(stderr, "tbf: failed to calculate peak rate table.\n");
 			return -1;
 		}
 		opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
 	}

 	tail = NLMSG_TAIL(n);
 	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 	addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
 	addattr_l(n, 2124, TCA_TBF_BURST, &buffer, sizeof(buffer));
 	if (rate64 >= (1ULL << 32))
 		addattr_l(n, 2124, TCA_TBF_RATE64, &rate64, sizeof(rate64));
 	addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
 	if (opt.peakrate.rate) {
 		if (prate64 >= (1ULL << 32))
 			addattr_l(n, 3124, TCA_TBF_PRATE64, &prate64, sizeof(prate64));
 		addattr_l(n, 3224, TCA_TBF_PBURST, &mtu, sizeof(mtu));
 		addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
 	}
 	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 	return 0;
 }

 static int tbf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 {
 	struct rtattr *tb[TCA_TBF_MAX+1];
 	struct tc_tbf_qopt *qopt;
 	unsigned int linklayer;
 	double buffer, mtu;
 	double latency;
 	__u64 rate64 = 0, prate64 = 0;
 	SPRINT_BUF(b1);
 	SPRINT_BUF(b2);
 	SPRINT_BUF(b3);

 	if (opt == NULL)
 		return 0;

 	parse_rtattr_nested(tb, TCA_TBF_MAX, opt);

 	if (tb[TCA_TBF_PARMS] == NULL)
 		return -1;

 	qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
 	if (RTA_PAYLOAD(tb[TCA_TBF_PARMS])  < sizeof(*qopt))
 		return -1;
 	rate64 = qopt->rate.rate;
 	if (tb[TCA_TBF_RATE64] &&
 	    RTA_PAYLOAD(tb[TCA_TBF_RATE64]) >= sizeof(rate64))
 		rate64 = rta_getattr_u64(tb[TCA_TBF_RATE64]);
 	fprintf(f, "rate %s ", sprint_rate(rate64, b1));
 	buffer = tc_calc_xmitsize(rate64, qopt->buffer);
 	if (show_details) {
 		fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
 			1<<qopt->rate.cell_log, sprint_size(qopt->rate.mpu, b2));
 	} else {
 		fprintf(f, "burst %s ", sprint_size(buffer, b1));
 	}
 	if (show_raw)
 		fprintf(f, "[%08x] ", qopt->buffer);
 	prate64 = qopt->peakrate.rate;
 	if (tb[TCA_TBF_PRATE64] &&
 	    RTA_PAYLOAD(tb[TCA_TBF_PRATE64]) >= sizeof(prate64))
 		prate64 = rta_getattr_u64(tb[TCA_TBF_PRATE64]);
 	if (prate64) {
 		fprintf(f, "peakrate %s ", sprint_rate(prate64, b1));
 		if (qopt->mtu || qopt->peakrate.mpu) {
 			mtu = tc_calc_xmitsize(prate64, qopt->mtu);
 			if (show_details) {
 				fprintf(f, "mtu %s/%u mpu %s ", sprint_size(mtu, b1),
 					1<<qopt->peakrate.cell_log, sprint_size(qopt->peakrate.mpu, b2));
 			} else {
 				fprintf(f, "minburst %s ", sprint_size(mtu, b1));
 			}
 			if (show_raw)
 				fprintf(f, "[%08x] ", qopt->mtu);
 		}
 	}

 	if (show_raw)
 		fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));

 	latency = TIME_UNITS_PER_SEC*(qopt->limit/(double)rate64) - tc_core_tick2time(qopt->buffer);
 	if (prate64) {
 		double lat2 = TIME_UNITS_PER_SEC*(qopt->limit/(double)prate64) - tc_core_tick2time(qopt->mtu);
 		if (lat2 > latency)
 			latency = lat2;
 	}
 	fprintf(f, "lat %s ", sprint_time(latency, b1));

 	if (qopt->rate.overhead) {
 		fprintf(f, "overhead %d", qopt->rate.overhead);
 	}
 	linklayer = (qopt->rate.linklayer & TC_LINKLAYER_MASK);
 	if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
 		fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b3));

 	return 0;
 }

 struct qdisc_util tbf_qdisc_util = {
 	.id		= "tbf",
 	.parse_qopt	= tbf_parse_opt,
 	.print_qopt	= tbf_print_opt,
 };
	/*
	* q_tbf.c TBF.
	*
	* 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 <syslog.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: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu BYTES[/BYTES] ]\n");
	fprintf(stderr, " [ peakrate KBPS ] [ latency TIME ] ");
	fprintf(stderr, "[ overhead BYTES ] [ linklayer TYPE ]\n");
	}

	static void explain1(const char arg, const char val)
	{
	fprintf(stderr, "tbf: illegal value for \"%s\": \"%s\"\n", arg, val);
	}


	static int tbf_parse_opt(struct qdisc_util qu, int argc, char argv, struct nlmsghdr n)
	{
	int ok=0;
	struct tc_tbf_qopt opt;
	__u32 rtab[256];
	__u32 ptab[256];
	unsigned buffer=0, mtu=0, mpu=0, latency=0;
	int Rcell_log=-1, Pcell_log = -1;
	unsigned short overhead=0;
	unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
	struct rtattr *tail;
	__u64 rate64 = 0, prate64 = 0;

	memset(&opt, 0, sizeof(opt));

	while (argc > 0) {
	if (matches(*argv, "limit") == 0) {
	NEXT_ARG();
	if (opt.limit) {
	fprintf(stderr, "tbf: duplicate \"limit\" specification\n");
	return -1;
	}
	if (latency) {
	fprintf(stderr, "tbf: specifying both \"latency\" and \"limit\" is not allowed\n");
	return -1;
	}
	if (get_size(&opt.limit, *argv)) {
	explain1("limit", *argv);
	return -1;
	}
	ok++;
	} else if (matches(*argv, "latency") == 0) {
	NEXT_ARG();
	if (latency) {
	fprintf(stderr, "tbf: duplicate \"latency\" specification\n");
	return -1;
	}
	if (opt.limit) {
	fprintf(stderr, "tbf: specifying both \"limit\" and \"/latency\" is not allowed\n");
	return -1;
	}
	if (get_time(&latency, *argv)) {
	explain1("latency", *argv);
	return -1;
	}
	ok++;
	} else if (matches(*argv, "burst") == 0 \|\|
	strcmp(*argv, "buffer") == 0 \|\|
	strcmp(*argv, "maxburst") == 0) {
	const char parm_name = argv;
	NEXT_ARG();
	if (buffer) {
	fprintf(stderr, "tbf: duplicate \"buffer/burst/maxburst\" specification\n");
	return -1;
	}
	if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
	explain1(parm_name, *argv);
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "mtu") == 0 \|\|
	strcmp(*argv, "minburst") == 0) {
	const char parm_name = argv;
	NEXT_ARG();
	if (mtu) {
	fprintf(stderr, "tbf: duplicate \"mtu/minburst\" specification\n");
	return -1;
	}
	if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
	explain1(parm_name, *argv);
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "mpu") == 0) {
	NEXT_ARG();
	if (mpu) {
	fprintf(stderr, "tbf: duplicate \"mpu\" specification\n");
	return -1;
	}
	if (get_size(&mpu, *argv)) {
	explain1("mpu", *argv);
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "rate") == 0) {
	NEXT_ARG();
	if (rate64) {
	fprintf(stderr, "tbf: duplicate \"rate\" specification\n");
	return -1;
	}
	if (get_rate64(&rate64, *argv)) {
	explain1("rate", *argv);
	return -1;
	}
	ok++;
	} else if (matches(*argv, "peakrate") == 0) {
	NEXT_ARG();
	if (prate64) {
	fprintf(stderr, "tbf: duplicate \"peakrate\" specification\n");
	return -1;
	}
	if (get_rate64(&prate64, *argv)) {
	explain1("peakrate", *argv);
	return -1;
	}
	ok++;
	} else if (matches(*argv, "overhead") == 0) {
	NEXT_ARG();
	if (overhead) {
	fprintf(stderr, "tbf: duplicate \"overhead\" specification\n");
	return -1;
	}
	if (get_u16(&overhead, *argv, 10)) {
	explain1("overhead", *argv); return -1;
	}
	} else if (matches(*argv, "linklayer") == 0) {
	NEXT_ARG();
	if (get_linklayer(&linklayer, *argv)) {
	explain1("linklayer", *argv); return -1;
	}
	} else if (strcmp(*argv, "help") == 0) {
	explain();
	return -1;
	} else {
	fprintf(stderr, "tbf: unknown parameter \"%s\"\n", *argv);
	explain();
	return -1;
	}
	argc--; argv++;
	}

	int verdict = 0;

	/* Be nice to the user: try to emit all error messages in
	* one go rather than reveal one more problem when a
	* previous one has been fixed.
	*/
	if (rate64 == 0) {
	fprintf(stderr, "tbf: the \"rate\" parameter is mandatory.\n");
	verdict = -1;
	}
	if (!buffer) {
	fprintf(stderr, "tbf: the \"burst\" parameter is mandatory.\n");
	verdict = -1;
	}
	if (prate64) {
	if (!mtu) {
	fprintf(stderr, "tbf: when \"peakrate\" is specified, \"mtu\" must also be specified.\n");
	verdict = -1;
	}
	}

	if (opt.limit == 0 && latency == 0) {
	fprintf(stderr, "tbf: either \"limit\" or \"latency\" is required.\n");
	verdict = -1;
	}

	if (verdict != 0) {
	explain();
	return verdict;
	}

	opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64;
	opt.peakrate.rate = (prate64 >= (1ULL << 32)) ? ~0U : prate64;

	if (opt.limit == 0) {
	double lim = rate64*(double)latency/TIME_UNITS_PER_SEC + buffer;
	if (prate64) {
	double lim2 = prate64*(double)latency/TIME_UNITS_PER_SEC + mtu;
	if (lim2 < lim)
	lim = lim2;
	}
	opt.limit = lim;
	}

	opt.rate.mpu = mpu;
	opt.rate.overhead = overhead;
	if (tc_calc_rtable(&opt.rate, rtab, Rcell_log, mtu, linklayer) < 0) {
	fprintf(stderr, "tbf: failed to calculate rate table.\n");
	return -1;
	}
	opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);

	if (opt.peakrate.rate) {
	opt.peakrate.mpu = mpu;
	opt.peakrate.overhead = overhead;
	if (tc_calc_rtable(&opt.peakrate, ptab, Pcell_log, mtu, linklayer) < 0) {
	fprintf(stderr, "tbf: failed to calculate peak rate table.\n");
	return -1;
	}
	opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
	}

	tail = NLMSG_TAIL(n);
	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
	addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
	addattr_l(n, 2124, TCA_TBF_BURST, &buffer, sizeof(buffer));
	if (rate64 >= (1ULL << 32))
	addattr_l(n, 2124, TCA_TBF_RATE64, &rate64, sizeof(rate64));
	addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
	if (opt.peakrate.rate) {
	if (prate64 >= (1ULL << 32))
	addattr_l(n, 3124, TCA_TBF_PRATE64, &prate64, sizeof(prate64));
	addattr_l(n, 3224, TCA_TBF_PBURST, &mtu, sizeof(mtu));
	addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
	}
	tail->rta_len = (void ) NLMSG_TAIL(n) - (void ) tail;
	return 0;
	}

	static int tbf_print_opt(struct qdisc_util qu, FILE f, struct rtattr *opt)
	{
	struct rtattr *tb[TCA_TBF_MAX+1];
	struct tc_tbf_qopt *qopt;
	unsigned int linklayer;
	double buffer, mtu;
	double latency;
	__u64 rate64 = 0, prate64 = 0;
	SPRINT_BUF(b1);
	SPRINT_BUF(b2);
	SPRINT_BUF(b3);

	if (opt == NULL)
	return 0;

	parse_rtattr_nested(tb, TCA_TBF_MAX, opt);

	if (tb[TCA_TBF_PARMS] == NULL)
	return -1;

	qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
	if (RTA_PAYLOAD(tb[TCA_TBF_PARMS]) < sizeof(*qopt))
	return -1;
	rate64 = qopt->rate.rate;
	if (tb[TCA_TBF_RATE64] &&
	RTA_PAYLOAD(tb[TCA_TBF_RATE64]) >= sizeof(rate64))
	rate64 = rta_getattr_u64(tb[TCA_TBF_RATE64]);
	fprintf(f, "rate %s ", sprint_rate(rate64, b1));
	buffer = tc_calc_xmitsize(rate64, qopt->buffer);
	if (show_details) {
	fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
	1<<qopt->rate.cell_log, sprint_size(qopt->rate.mpu, b2));
	} else {
	fprintf(f, "burst %s ", sprint_size(buffer, b1));
	}
	if (show_raw)
	fprintf(f, "[%08x] ", qopt->buffer);
	prate64 = qopt->peakrate.rate;
	if (tb[TCA_TBF_PRATE64] &&
	RTA_PAYLOAD(tb[TCA_TBF_PRATE64]) >= sizeof(prate64))
	prate64 = rta_getattr_u64(tb[TCA_TBF_PRATE64]);
	if (prate64) {
	fprintf(f, "peakrate %s ", sprint_rate(prate64, b1));
	if (qopt->mtu \|\| qopt->peakrate.mpu) {
	mtu = tc_calc_xmitsize(prate64, qopt->mtu);
	if (show_details) {
	fprintf(f, "mtu %s/%u mpu %s ", sprint_size(mtu, b1),
	1<<qopt->peakrate.cell_log, sprint_size(qopt->peakrate.mpu, b2));
	} else {
	fprintf(f, "minburst %s ", sprint_size(mtu, b1));
	}
	if (show_raw)
	fprintf(f, "[%08x] ", qopt->mtu);
	}
	}

	if (show_raw)
	fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));

	latency = TIME_UNITS_PER_SEC*(qopt->limit/(double)rate64) - tc_core_tick2time(qopt->buffer);
	if (prate64) {
	double lat2 = TIME_UNITS_PER_SEC*(qopt->limit/(double)prate64) - tc_core_tick2time(qopt->mtu);
	if (lat2 > latency)
	latency = lat2;
	}
	fprintf(f, "lat %s ", sprint_time(latency, b1));

	if (qopt->rate.overhead) {
	fprintf(f, "overhead %d", qopt->rate.overhead);
	}
	linklayer = (qopt->rate.linklayer & TC_LINKLAYER_MASK);
	if (linklayer > TC_LINKLAYER_ETHERNET \|\| show_details)
	fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b3));

	return 0;
	}

	struct qdisc_util tbf_qdisc_util = {
	.id = "tbf",
	.parse_qopt = tbf_parse_opt,
	.print_qopt = tbf_print_opt,
	};