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

 /*
  * q_sfq.c		SFQ.
  *
  *		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 <math.h>

 #include "utils.h"
 #include "tc_util.h"
 #include "tc_red.h"

 static void explain(void)
 {
 	fprintf(stderr, "Usage: ... sfq [ limit NUMBER ] [ perturb SECS ] [ quantum BYTES ]\n");
 	fprintf(stderr, "               [ divisor NUMBER ] [ flows NUMBER] [ depth NUMBER ]\n");
 	fprintf(stderr, "               [ headdrop ]\n");
 	fprintf(stderr, "               [ redflowlimit BYTES ] [ min BYTES ] [ max BYTES ]\n");
 	fprintf(stderr, "               [ avpkt BYTES ] [ burst PACKETS ] [ probability P ]\n");
 	fprintf(stderr, "               [ ecn ] [ harddrop ]\n");
 }

 static int sfq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 {
 	int ok = 0, red = 0;
 	struct tc_sfq_qopt_v1 opt;
 	unsigned int burst = 0;
 	int wlog;
 	unsigned int avpkt = 1000;
 	double probability = 0.02;

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

 	while (argc > 0) {
 		if (strcmp(*argv, "quantum") == 0) {
 			NEXT_ARG();
 			if (get_size(&opt.v0.quantum, *argv)) {
 				fprintf(stderr, "Illegal \"limit\"\n");
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "perturb") == 0) {
 			NEXT_ARG();
 			if (get_integer(&opt.v0.perturb_period, *argv, 0)) {
 				fprintf(stderr, "Illegal \"perturb\"\n");
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "limit") == 0) {
 			NEXT_ARG();
 			if (get_u32(&opt.v0.limit, *argv, 0)) {
 				fprintf(stderr, "Illegal \"limit\"\n");
 				return -1;
 			}
 			if (opt.v0.limit < 2) {
 				fprintf(stderr, "Illegal \"limit\", must be > 1\n");
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "divisor") == 0) {
 			NEXT_ARG();
 			if (get_u32(&opt.v0.divisor, *argv, 0)) {
 				fprintf(stderr, "Illegal \"divisor\"\n");
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "flows") == 0) {
 			NEXT_ARG();
 			if (get_u32(&opt.v0.flows, *argv, 0)) {
 				fprintf(stderr, "Illegal \"flows\"\n");
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "depth") == 0) {
 			NEXT_ARG();
 			if (get_u32(&opt.depth, *argv, 0)) {
 				fprintf(stderr, "Illegal \"flows\"\n");
 				return -1;
 			}
 			ok++;
 		} else if (strcmp(*argv, "headdrop") == 0) {
 			opt.headdrop = 1;
 			ok++;
 		} else if (strcmp(*argv, "redflowlimit") == 0) {
 			NEXT_ARG();
 			if (get_u32(&opt.limit, *argv, 0)) {
 				fprintf(stderr, "Illegal \"redflowlimit\"\n");
 				return -1;
 			}
 			red++;
 		} else if (strcmp(*argv, "min") == 0) {
 			NEXT_ARG();
 			if (get_u32(&opt.qth_min, *argv, 0)) {
 				fprintf(stderr, "Illegal \"min\"\n");
 				return -1;
 			}
 			red++;
 		} else if (strcmp(*argv, "max") == 0) {
 			NEXT_ARG();
 			if (get_u32(&opt.qth_max, *argv, 0)) {
 				fprintf(stderr, "Illegal \"max\"\n");
 				return -1;
 			}
 			red++;
 		} else if (strcmp(*argv, "burst") == 0) {
 			NEXT_ARG();
 			if (get_unsigned(&burst, *argv, 0)) {
 				fprintf(stderr, "Illegal \"burst\"\n");
 				return -1;
 			}
 			red++;
 		} else if (strcmp(*argv, "avpkt") == 0) {
 			NEXT_ARG();
 			if (get_size(&avpkt, *argv)) {
 				fprintf(stderr, "Illegal \"avpkt\"\n");
 				return -1;
 			}
 			red++;
 		} else if (strcmp(*argv, "probability") == 0) {
 			NEXT_ARG();
 			if (sscanf(*argv, "%lg", &probability) != 1) {
 				fprintf(stderr, "Illegal \"probability\"\n");
 				return -1;
 			}
 			red++;
 		} else if (strcmp(*argv, "ecn") == 0) {
 			opt.flags |= TC_RED_ECN;
 			red++;
 		} else if (strcmp(*argv, "harddrop") == 0) {
 			opt.flags |= TC_RED_HARDDROP;
 			red++;
 		} else if (strcmp(*argv, "help") == 0) {
 			explain();
 			return -1;
 		} else {
 			fprintf(stderr, "What is \"%s\"?\n", *argv);
 			explain();
 			return -1;
 		}
 		argc--; argv++;
 	}
 	if (red) {
 		if (!opt.limit) {
 			fprintf(stderr, "Required parameter (redflowlimit) is missing\n");
 			return -1;
 		}
 		/* Compute default min/max thresholds based on
 		   Sally Floyd's recommendations:
 		   http://www.icir.org/floyd/REDparameters.txt
 		*/
 		if (!opt.qth_max)
 			opt.qth_max = opt.limit / 4;
 		if (!opt.qth_min)
 			opt.qth_min = opt.qth_max / 3;
 		if (!burst)
 			burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);

 		if (opt.qth_max > opt.limit) {
 			fprintf(stderr, "\"max\" is larger than \"limit\"\n");
 			return -1;
 		}

 		if (opt.qth_min >= opt.qth_max) {
 			fprintf(stderr, "\"min\" is not smaller than \"max\"\n");
 			return -1;
 		}

 		wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt);
 		if (wlog < 0) {
 			fprintf(stderr, "SFQ: failed to calculate EWMA constant.\n");
 			return -1;
 		}
 		if (wlog >= 10)
 			fprintf(stderr, "SFQ: WARNING. Burst %u seems to be too large.\n", burst);
 		opt.Wlog = wlog;

 		wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability);
 		if (wlog < 0) {
 			fprintf(stderr, "SFQ: failed to calculate probability.\n");
 			return -1;
 		}
 		opt.Plog = wlog;
 		opt.max_P = probability * pow(2, 32);
 	}

 	if (ok || red)
 		addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
 	return 0;
 }

 static int sfq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 {
 	struct tc_sfq_qopt *qopt;
 	struct tc_sfq_qopt_v1 *qopt_ext = NULL;
 	SPRINT_BUF(b1);
 	SPRINT_BUF(b2);
 	SPRINT_BUF(b3);
 	if (opt == NULL)
 		return 0;

 	if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
 		return -1;
 	if (RTA_PAYLOAD(opt) >= sizeof(*qopt_ext))
 		qopt_ext = RTA_DATA(opt);
 	qopt = RTA_DATA(opt);
 	fprintf(f, "limit %up ", qopt->limit);
 	fprintf(f, "quantum %s ", sprint_size(qopt->quantum, b1));
 	if (qopt_ext && qopt_ext->depth)
 		fprintf(f, "depth %u ", qopt_ext->depth);
 	if (qopt_ext && qopt_ext->headdrop)
 		fprintf(f, "headdrop ");

 	if (show_details) {
 		fprintf(f, "flows %u/%u ", qopt->flows, qopt->divisor);
 	}
 	fprintf(f, "divisor %u ", qopt->divisor);
 	if (qopt->perturb_period)
 		fprintf(f, "perturb %dsec ", qopt->perturb_period);
 	if (qopt_ext && qopt_ext->qth_min) {
 		fprintf(f, "\n ewma %u ", qopt_ext->Wlog);
 		fprintf(f, "min %s max %s probability %g ",
 			sprint_size(qopt_ext->qth_min, b2),
 			sprint_size(qopt_ext->qth_max, b3),
 			qopt_ext->max_P / pow(2, 32));
 		if (qopt_ext->flags & TC_RED_ECN)
 			fprintf(f, "ecn ");
 		if (show_stats) {
 			fprintf(f, "\n prob_mark %u prob_mark_head %u prob_drop %u",
 				qopt_ext->stats.prob_mark,
 				qopt_ext->stats.prob_mark_head,
 				qopt_ext->stats.prob_drop);
 			fprintf(f, "\n forced_mark %u forced_mark_head %u forced_drop %u",
 				qopt_ext->stats.forced_mark,
 				qopt_ext->stats.forced_mark_head,
 				qopt_ext->stats.forced_drop);
 		}
 	}
 	return 0;
 }

 static int sfq_print_xstats(struct qdisc_util *qu, FILE *f,
 			    struct rtattr *xstats)
 {
 	struct tc_sfq_xstats *st;

 	if (xstats == NULL)
 		return 0;
 	if (RTA_PAYLOAD(xstats) < sizeof(*st))
 		return -1;
 	st = RTA_DATA(xstats);

 	fprintf(f, " allot %d ", st->allot);
 	fprintf(f, "\n");
 	return 0;
 }

 struct qdisc_util sfq_qdisc_util = {
 	.id		= "sfq",
 	.parse_qopt	= sfq_parse_opt,
 	.print_qopt	= sfq_print_opt,
 	.print_xstats	= sfq_print_xstats,
 };
	/*
	* q_sfq.c SFQ.
	*
	* 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 <math.h>

	#include "utils.h"
	#include "tc_util.h"
	#include "tc_red.h"

	static void explain(void)
	{
	fprintf(stderr, "Usage: ... sfq [ limit NUMBER ] [ perturb SECS ] [ quantum BYTES ]\n");
	fprintf(stderr, " [ divisor NUMBER ] [ flows NUMBER] [ depth NUMBER ]\n");
	fprintf(stderr, " [ headdrop ]\n");
	fprintf(stderr, " [ redflowlimit BYTES ] [ min BYTES ] [ max BYTES ]\n");
	fprintf(stderr, " [ avpkt BYTES ] [ burst PACKETS ] [ probability P ]\n");
	fprintf(stderr, " [ ecn ] [ harddrop ]\n");
	}

	static int sfq_parse_opt(struct qdisc_util qu, int argc, char argv, struct nlmsghdr n)
	{
	int ok = 0, red = 0;
	struct tc_sfq_qopt_v1 opt;
	unsigned int burst = 0;
	int wlog;
	unsigned int avpkt = 1000;
	double probability = 0.02;

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

	while (argc > 0) {
	if (strcmp(*argv, "quantum") == 0) {
	NEXT_ARG();
	if (get_size(&opt.v0.quantum, *argv)) {
	fprintf(stderr, "Illegal \"limit\"\n");
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "perturb") == 0) {
	NEXT_ARG();
	if (get_integer(&opt.v0.perturb_period, *argv, 0)) {
	fprintf(stderr, "Illegal \"perturb\"\n");
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "limit") == 0) {
	NEXT_ARG();
	if (get_u32(&opt.v0.limit, *argv, 0)) {
	fprintf(stderr, "Illegal \"limit\"\n");
	return -1;
	}
	if (opt.v0.limit < 2) {
	fprintf(stderr, "Illegal \"limit\", must be > 1\n");
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "divisor") == 0) {
	NEXT_ARG();
	if (get_u32(&opt.v0.divisor, *argv, 0)) {
	fprintf(stderr, "Illegal \"divisor\"\n");
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "flows") == 0) {
	NEXT_ARG();
	if (get_u32(&opt.v0.flows, *argv, 0)) {
	fprintf(stderr, "Illegal \"flows\"\n");
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "depth") == 0) {
	NEXT_ARG();
	if (get_u32(&opt.depth, *argv, 0)) {
	fprintf(stderr, "Illegal \"flows\"\n");
	return -1;
	}
	ok++;
	} else if (strcmp(*argv, "headdrop") == 0) {
	opt.headdrop = 1;
	ok++;
	} else if (strcmp(*argv, "redflowlimit") == 0) {
	NEXT_ARG();
	if (get_u32(&opt.limit, *argv, 0)) {
	fprintf(stderr, "Illegal \"redflowlimit\"\n");
	return -1;
	}
	red++;
	} else if (strcmp(*argv, "min") == 0) {
	NEXT_ARG();
	if (get_u32(&opt.qth_min, *argv, 0)) {
	fprintf(stderr, "Illegal \"min\"\n");
	return -1;
	}
	red++;
	} else if (strcmp(*argv, "max") == 0) {
	NEXT_ARG();
	if (get_u32(&opt.qth_max, *argv, 0)) {
	fprintf(stderr, "Illegal \"max\"\n");
	return -1;
	}
	red++;
	} else if (strcmp(*argv, "burst") == 0) {
	NEXT_ARG();
	if (get_unsigned(&burst, *argv, 0)) {
	fprintf(stderr, "Illegal \"burst\"\n");
	return -1;
	}
	red++;
	} else if (strcmp(*argv, "avpkt") == 0) {
	NEXT_ARG();
	if (get_size(&avpkt, *argv)) {
	fprintf(stderr, "Illegal \"avpkt\"\n");
	return -1;
	}
	red++;
	} else if (strcmp(*argv, "probability") == 0) {
	NEXT_ARG();
	if (sscanf(*argv, "%lg", &probability) != 1) {
	fprintf(stderr, "Illegal \"probability\"\n");
	return -1;
	}
	red++;
	} else if (strcmp(*argv, "ecn") == 0) {
	opt.flags \|= TC_RED_ECN;
	red++;
	} else if (strcmp(*argv, "harddrop") == 0) {
	opt.flags \|= TC_RED_HARDDROP;
	red++;
	} else if (strcmp(*argv, "help") == 0) {
	explain();
	return -1;
	} else {
	fprintf(stderr, "What is \"%s\"?\n", *argv);
	explain();
	return -1;
	}
	argc--; argv++;
	}
	if (red) {
	if (!opt.limit) {
	fprintf(stderr, "Required parameter (redflowlimit) is missing\n");
	return -1;
	}
	/* Compute default min/max thresholds based on
	Sally Floyd's recommendations:
	http://www.icir.org/floyd/REDparameters.txt
	*/
	if (!opt.qth_max)
	opt.qth_max = opt.limit / 4;
	if (!opt.qth_min)
	opt.qth_min = opt.qth_max / 3;
	if (!burst)
	burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);

	if (opt.qth_max > opt.limit) {
	fprintf(stderr, "\"max\" is larger than \"limit\"\n");
	return -1;
	}

	if (opt.qth_min >= opt.qth_max) {
	fprintf(stderr, "\"min\" is not smaller than \"max\"\n");
	return -1;
	}

	wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt);
	if (wlog < 0) {
	fprintf(stderr, "SFQ: failed to calculate EWMA constant.\n");
	return -1;
	}
	if (wlog >= 10)
	fprintf(stderr, "SFQ: WARNING. Burst %u seems to be too large.\n", burst);
	opt.Wlog = wlog;

	wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability);
	if (wlog < 0) {
	fprintf(stderr, "SFQ: failed to calculate probability.\n");
	return -1;
	}
	opt.Plog = wlog;
	opt.max_P = probability * pow(2, 32);
	}

	if (ok \|\| red)
	addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
	return 0;
	}

	static int sfq_print_opt(struct qdisc_util qu, FILE f, struct rtattr *opt)
	{
	struct tc_sfq_qopt *qopt;
	struct tc_sfq_qopt_v1 *qopt_ext = NULL;
	SPRINT_BUF(b1);
	SPRINT_BUF(b2);
	SPRINT_BUF(b3);
	if (opt == NULL)
	return 0;

	if (RTA_PAYLOAD(opt) < sizeof(*qopt))
	return -1;
	if (RTA_PAYLOAD(opt) >= sizeof(*qopt_ext))
	qopt_ext = RTA_DATA(opt);
	qopt = RTA_DATA(opt);
	fprintf(f, "limit %up ", qopt->limit);
	fprintf(f, "quantum %s ", sprint_size(qopt->quantum, b1));
	if (qopt_ext && qopt_ext->depth)
	fprintf(f, "depth %u ", qopt_ext->depth);
	if (qopt_ext && qopt_ext->headdrop)
	fprintf(f, "headdrop ");

	if (show_details) {
	fprintf(f, "flows %u/%u ", qopt->flows, qopt->divisor);
	}
	fprintf(f, "divisor %u ", qopt->divisor);
	if (qopt->perturb_period)
	fprintf(f, "perturb %dsec ", qopt->perturb_period);
	if (qopt_ext && qopt_ext->qth_min) {
	fprintf(f, "\n ewma %u ", qopt_ext->Wlog);
	fprintf(f, "min %s max %s probability %g ",
	sprint_size(qopt_ext->qth_min, b2),
	sprint_size(qopt_ext->qth_max, b3),
	qopt_ext->max_P / pow(2, 32));
	if (qopt_ext->flags & TC_RED_ECN)
	fprintf(f, "ecn ");
	if (show_stats) {
	fprintf(f, "\n prob_mark %u prob_mark_head %u prob_drop %u",
	qopt_ext->stats.prob_mark,
	qopt_ext->stats.prob_mark_head,
	qopt_ext->stats.prob_drop);
	fprintf(f, "\n forced_mark %u forced_mark_head %u forced_drop %u",
	qopt_ext->stats.forced_mark,
	qopt_ext->stats.forced_mark_head,
	qopt_ext->stats.forced_drop);
	}
	}
	return 0;
	}

	static int sfq_print_xstats(struct qdisc_util qu, FILE f,
	struct rtattr *xstats)
	{
	struct tc_sfq_xstats *st;

	if (xstats == NULL)
	return 0;
	if (RTA_PAYLOAD(xstats) < sizeof(*st))
	return -1;
	st = RTA_DATA(xstats);

	fprintf(f, " allot %d ", st->allot);
	fprintf(f, "\n");
	return 0;
	}

	struct qdisc_util sfq_qdisc_util = {
	.id = "sfq",
	.parse_qopt = sfq_parse_opt,
	.print_qopt = sfq_print_opt,
	.print_xstats = sfq_print_xstats,
	};