/*
* q_hfsc.c HFSC.
*
* 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 <math.h>
#include "utils.h"
#include "tc_util.h"
static int hfsc_get_sc(int *, char ***,
struct tc_service_curve *, const char *);
static void
explain_qdisc(void)
{
fprintf(stderr,
"Usage: ... hfsc [ default CLASSID ]\n"
"\n"
" default: default class for unclassified packets\n"
);
}
static void
explain_class(void)
{
fprintf(stderr,
"Usage: ... hfsc [ [ rt SC ] [ ls SC ] | [ sc SC ] ] [ ul SC ]\n"
"\n"
"SC := [ [ m1 BPS ] d SEC ] m2 BPS\n"
"\n"
" m1 : slope of first segment\n"
" d : x-coordinate of intersection\n"
" m2 : slope of second segment\n"
"\n"
"Alternative format:\n"
"\n"
"SC := [ [ umax BYTE ] dmax SEC ] rate BPS\n"
"\n"
" umax : maximum unit of work\n"
" dmax : maximum delay\n"
" rate : rate\n"
"\n"
"Remarks:\n"
" - at least one of 'rt', 'ls' or 'sc' must be specified\n"
" - 'ul' can only be specified with 'ls' or 'sc'\n"
"\n"
);
}
static void
explain1(char *arg)
{
fprintf(stderr, "HFSC: Illegal \"%s\"\n", arg);
}
static int
hfsc_parse_opt(struct qdisc_util *qu, int argc, char **argv,
struct nlmsghdr *n, const char *dev)
{
struct tc_hfsc_qopt qopt = {};
while (argc > 0) {
if (matches(*argv, "default") == 0) {
NEXT_ARG();
if (qopt.defcls != 0) {
fprintf(stderr, "HFSC: Double \"default\"\n");
return -1;
}
if (get_u16(&qopt.defcls, *argv, 16) < 0) {
explain1("default");
return -1;
}
} else if (matches(*argv, "help") == 0) {
explain_qdisc();
return -1;
} else {
fprintf(stderr, "HFSC: What is \"%s\" ?\n", *argv);
explain_qdisc();
return -1;
}
argc--, argv++;
}
addattr_l(n, 1024, TCA_OPTIONS, &qopt, sizeof(qopt));
return 0;
}
static int
hfsc_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
struct tc_hfsc_qopt *qopt;
if (opt == NULL)
return 0;
if (RTA_PAYLOAD(opt) < sizeof(*qopt))
return -1;
qopt = RTA_DATA(opt);
if (qopt->defcls != 0)
fprintf(f, "default %x ", qopt->defcls);
return 0;
}
static int
hfsc_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
{
struct tc_hfsc_stats *st;
if (xstats == NULL)
return 0;
if (RTA_PAYLOAD(xstats) < sizeof(*st))
return -1;
st = RTA_DATA(xstats);
fprintf(f, " period %u ", st->period);
if (st->work != 0)
fprintf(f, "work %llu bytes ", (unsigned long long) st->work);
if (st->rtwork != 0)
fprintf(f, "rtwork %llu bytes ", (unsigned long long) st->rtwork);
fprintf(f, "level %u ", st->level);
fprintf(f, "\n");
return 0;
}
static int
hfsc_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
struct nlmsghdr *n, const char *dev)
{
struct tc_service_curve rsc = {}, fsc = {}, usc = {};
int rsc_ok = 0, fsc_ok = 0, usc_ok = 0;
struct rtattr *tail;
while (argc > 0) {
if (matches(*argv, "rt") == 0) {
NEXT_ARG();
if (hfsc_get_sc(&argc, &argv, &rsc, dev) < 0) {
explain1("rt");
return -1;
}
rsc_ok = 1;
} else if (matches(*argv, "ls") == 0) {
NEXT_ARG();
if (hfsc_get_sc(&argc, &argv, &fsc, dev) < 0) {
explain1("ls");
return -1;
}
fsc_ok = 1;
} else if (matches(*argv, "sc") == 0) {
NEXT_ARG();
if (hfsc_get_sc(&argc, &argv, &rsc, dev) < 0) {
explain1("sc");
return -1;
}
memcpy(&fsc, &rsc, sizeof(fsc));
rsc_ok = 1;
fsc_ok = 1;
} else if (matches(*argv, "ul") == 0) {
NEXT_ARG();
if (hfsc_get_sc(&argc, &argv, &usc, dev) < 0) {
explain1("ul");
return -1;
}
usc_ok = 1;
} else if (matches(*argv, "help") == 0) {
explain_class();
return -1;
} else {
fprintf(stderr, "HFSC: What is \"%s\" ?\n", *argv);
explain_class();
return -1;
}
argc--, argv++;
}
if (!(rsc_ok || fsc_ok || usc_ok)) {
fprintf(stderr, "HFSC: no parameters given\n");
explain_class();
return -1;
}
if (usc_ok && !fsc_ok) {
fprintf(stderr, "HFSC: Upper-limit Service Curve without Link-Share Service Curve\n");
explain_class();
return -1;
}
tail = addattr_nest(n, 1024, TCA_OPTIONS);
if (rsc_ok)
addattr_l(n, 1024, TCA_HFSC_RSC, &rsc, sizeof(rsc));
if (fsc_ok)
addattr_l(n, 1024, TCA_HFSC_FSC, &fsc, sizeof(fsc));
if (usc_ok)
addattr_l(n, 1024, TCA_HFSC_USC, &usc, sizeof(usc));
addattr_nest_end(n, tail);
return 0;
}
static void
hfsc_print_sc(FILE *f, char *name, struct tc_service_curve *sc)
{
SPRINT_BUF(b1);
fprintf(f, "%s ", name);
fprintf(f, "m1 %s ", sprint_rate(sc->m1, b1));
fprintf(f, "d %s ", sprint_time(tc_core_ktime2time(sc->d), b1));
fprintf(f, "m2 %s ", sprint_rate(sc->m2, b1));
}
static int
hfsc_print_class_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
struct rtattr *tb[TCA_HFSC_MAX+1];
struct tc_service_curve *rsc = NULL, *fsc = NULL, *usc = NULL;
if (opt == NULL)
return 0;
parse_rtattr_nested(tb, TCA_HFSC_MAX, opt);
if (tb[TCA_HFSC_RSC]) {
if (RTA_PAYLOAD(tb[TCA_HFSC_RSC]) < sizeof(*rsc))
fprintf(stderr, "HFSC: truncated realtime option\n");
else
rsc = RTA_DATA(tb[TCA_HFSC_RSC]);
}
if (tb[TCA_HFSC_FSC]) {
if (RTA_PAYLOAD(tb[TCA_HFSC_FSC]) < sizeof(*fsc))
fprintf(stderr, "HFSC: truncated linkshare option\n");
else
fsc = RTA_DATA(tb[TCA_HFSC_FSC]);
}
if (tb[TCA_HFSC_USC]) {
if (RTA_PAYLOAD(tb[TCA_HFSC_USC]) < sizeof(*usc))
fprintf(stderr, "HFSC: truncated upperlimit option\n");
else
usc = RTA_DATA(tb[TCA_HFSC_USC]);
}
if (rsc != NULL && fsc != NULL &&
memcmp(rsc, fsc, sizeof(*rsc)) == 0)
hfsc_print_sc(f, "sc", rsc);
else {
if (rsc != NULL)
hfsc_print_sc(f, "rt", rsc);
if (fsc != NULL)
hfsc_print_sc(f, "ls", fsc);
}
if (usc != NULL)
hfsc_print_sc(f, "ul", usc);
return 0;
}
struct qdisc_util hfsc_qdisc_util = {
.id = "hfsc",
.parse_qopt = hfsc_parse_opt,
.print_qopt = hfsc_print_opt,
.print_xstats = hfsc_print_xstats,
.parse_copt = hfsc_parse_class_opt,
.print_copt = hfsc_print_class_opt,
};
static int
hfsc_get_sc1(int *argcp, char ***argvp,
struct tc_service_curve *sc, const char *dev)
{
char **argv = *argvp;
int argc = *argcp;
unsigned int m1 = 0, d = 0, m2 = 0;
if (matches(*argv, "m1") == 0) {
NEXT_ARG();
if (strchr(*argv, '%')) {
if (get_percent_rate(&m1, *argv, dev)) {
explain1("m1");
return -1;
}
} else if (get_rate(&m1, *argv) < 0) {
explain1("m1");
return -1;
}
NEXT_ARG();
}
if (matches(*argv, "d") == 0) {
NEXT_ARG();
if (get_time(&d, *argv) < 0) {
explain1("d");
return -1;
}
NEXT_ARG();
}
if (matches(*argv, "m2") == 0) {
NEXT_ARG();
if (strchr(*argv, '%')) {
if (get_percent_rate(&m2, *argv, dev)) {
explain1("m2");
return -1;
}
} else if (get_rate(&m2, *argv) < 0) {
explain1("m2");
return -1;
}
} else
return -1;
sc->m1 = m1;
sc->d = tc_core_time2ktime(d);
sc->m2 = m2;
*argvp = argv;
*argcp = argc;
return 0;
}
static int
hfsc_get_sc2(int *argcp, char ***argvp, struct tc_service_curve *sc, const char *dev)
{
char **argv = *argvp;
int argc = *argcp;
unsigned int umax = 0, dmax = 0, rate = 0;
if (matches(*argv, "umax") == 0) {
NEXT_ARG();
if (get_size(&umax, *argv) < 0) {
explain1("umax");
return -1;
}
NEXT_ARG();
}
if (matches(*argv, "dmax") == 0) {
NEXT_ARG();
if (get_time(&dmax, *argv) < 0) {
explain1("dmax");
return -1;
}
NEXT_ARG();
}
if (matches(*argv, "rate") == 0) {
NEXT_ARG();
if (strchr(*argv, '%')) {
if (get_percent_rate(&rate, *argv, dev)) {
explain1("rate");
return -1;
}
} else if (get_rate(&rate, *argv) < 0) {
explain1("rate");
return -1;
}
} else
return -1;
if (umax != 0 && dmax == 0) {
fprintf(stderr, "HFSC: umax given but dmax is zero.\n");
return -1;
}
if (dmax != 0 && ceil(1.0 * umax * TIME_UNITS_PER_SEC / dmax) > rate) {
/*
* concave curve, slope of first segment is umax/dmax,
* intersection is at dmax
*/
sc->m1 = ceil(1.0 * umax * TIME_UNITS_PER_SEC / dmax); /* in bps */
sc->d = tc_core_time2ktime(dmax);
sc->m2 = rate;
} else {
/*
* convex curve, slope of first segment is 0, intersection
* is at dmax - umax / rate
*/
sc->m1 = 0;
sc->d = tc_core_time2ktime(ceil(dmax - umax * TIME_UNITS_PER_SEC / rate));
sc->m2 = rate;
}
*argvp = argv;
*argcp = argc;
return 0;
}
static int
hfsc_get_sc(int *argcp, char ***argvp, struct tc_service_curve *sc, const char *dev)
{
if (hfsc_get_sc1(argcp, argvp, sc, dev) < 0 &&
hfsc_get_sc2(argcp, argvp, sc, dev) < 0)
return -1;
if (sc->m1 == 0 && sc->m2 == 0) {
fprintf(stderr, "HFSC: Service Curve has two zero slopes\n");
return -1;
}
return 0;
}