tc/q_hfsc.c

   1 /*
   2  * q_hfsc.c     HFSC.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Patrick McHardy, <kaber@trash.net>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <string.h>
  22 #include <math.h>
  23
  24 #include "utils.h"
  25 #include "tc_util.h"
  26
  27 static int hfsc_get_sc(int *, char ***, struct tc_service_curve *);
  28
  29
  30 static void
  31 explain_qdisc(void)
  32 {
  33         fprintf(stderr,
  34                 "Usage: ... hfsc [ default CLASSID ]\n"
  35                 "\n"
  36                 " default: default class for unclassified packets\n"
  37         );
  38 }
  39
  40 static void
  41 explain_class(void)
  42 {
  43         fprintf(stderr,
  44                 "Usage: ... hfsc [ [ rt SC ] [ ls SC ] | [ sc SC ] ] [ ul SC ]\n"
  45                 "\n"
  46                 "SC := [ [ m1 BPS ] [ d SEC ] m2 BPS\n"
  47                 "\n"
  48                 " m1 : slope of first segment\n"
  49                 " d  : x-coordinate of intersection\n"
  50                 " m2 : slope of second segment\n"
  51                 "\n"
  52                 "Alternative format:\n"
  53                 "\n"
  54                 "SC := [ [ umax BYTE ] dmax SEC ] rate BPS\n"
  55                 "\n"
  56                 " umax : maximum unit of work\n"
  57                 " dmax : maximum delay\n"
  58                 " rate : rate\n"
  59                 "\n"
  60         );
  61 }
  62
  63 static void
  64 explain1(char *arg)
  65 {
  66         fprintf(stderr, "HFSC: Illegal \"%s\"\n", arg);
  67 }
  68
  69 static int
  70 hfsc_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  71 {
  72         struct tc_hfsc_qopt qopt;
  73
  74         memset(&qopt, 0, sizeof(qopt));
  75
  76         while (argc > 0) {
  77                 if (matches(*argv, "default") == 0) {
  78                         NEXT_ARG();
  79                         if (qopt.defcls != 0) {
  80                                 fprintf(stderr, "HFSC: Double \"default\"\n");
  81                                 return -1;
  82                         }
  83                         if (get_u16(&qopt.defcls, *argv, 16) < 0) {
  84                                 explain1("default");
  85                                 return -1;
  86                         }
  87                 } else if (matches(*argv, "help") == 0) {
  88                         explain_qdisc();
  89                         return -1;
  90                 } else {
  91                         fprintf(stderr, "HFSC: What is \"%s\" ?\n", *argv);
  92                         explain_qdisc();
  93                         return -1;
  94                 }
  95                 argc--, argv++;
  96         }
  97
  98         addattr_l(n, 1024, TCA_OPTIONS, &qopt, sizeof(qopt));
  99         return 0;
 100 }
 101
 102 static int
 103 hfsc_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 104 {
 105         struct tc_hfsc_qopt *qopt;
 106
 107         if (opt == NULL)
 108                 return 0;
 109         if (RTA_PAYLOAD(opt) < sizeof(*qopt))
 110                 return -1;
 111         qopt = RTA_DATA(opt);
 112
 113         if (qopt->defcls != 0)
 114                 fprintf(f, "default %x ", qopt->defcls);
 115
 116         return 0;
 117 }
 118
 119 static int
 120 hfsc_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 121 {
 122         struct tc_hfsc_stats *st;
 123
 124         if (xstats == NULL)
 125                 return 0;
 126         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 127                 return -1;
 128         st = RTA_DATA(xstats);
 129
 130         fprintf(f, " period %u ", st->period);
 131         if (st->work != 0)
 132                 fprintf(f, "work %llu bytes ", (unsigned long long) st->work);
 133         if (st->rtwork != 0)
 134                 fprintf(f, "rtwork %llu bytes ", (unsigned long long) st->rtwork);
 135         fprintf(f, "level %u ", st->level);
 136         fprintf(f, "\n");
 137
 138         return 0;
 139 }
 140
 141 static int
 142 hfsc_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
 143                      struct nlmsghdr *n)
 144 {
 145         struct tc_service_curve rsc, fsc, usc;
 146         int rsc_ok, fsc_ok, usc_ok;
 147         struct rtattr *tail;
 148
 149         memset(&rsc, 0, sizeof(rsc));
 150         memset(&fsc, 0, sizeof(fsc));
 151         memset(&usc, 0, sizeof(usc));
 152         rsc_ok = fsc_ok = usc_ok = 0;
 153
 154         while (argc > 0) {
 155                 if (matches(*argv, "rt") == 0) {
 156                         NEXT_ARG();
 157                         if (hfsc_get_sc(&argc, &argv, &rsc) < 0) {
 158                                 explain1("rt");
 159                                 return -1;
 160                         }
 161                         rsc_ok = 1;
 162                 } else if (matches(*argv, "ls") == 0) {
 163                         NEXT_ARG();
 164                         if (hfsc_get_sc(&argc, &argv, &fsc) < 0) {
 165                                 explain1("ls");
 166                                 return -1;
 167                         }
 168                         fsc_ok = 1;
 169                 } else if (matches(*argv, "sc") == 0) {
 170                         NEXT_ARG();
 171                         if (hfsc_get_sc(&argc, &argv, &rsc) < 0) {
 172                                 explain1("sc");
 173                                 return -1;
 174                         }
 175                         memcpy(&fsc, &rsc, sizeof(fsc));
 176                         rsc_ok = 1;
 177                         fsc_ok = 1;
 178                 } else if (matches(*argv, "ul") == 0) {
 179                         NEXT_ARG();
 180                         if (hfsc_get_sc(&argc, &argv, &usc) < 0) {
 181                                 explain1("ul");
 182                                 return -1;
 183                         }
 184                         usc_ok = 1;
 185                 } else if (matches(*argv, "help") == 0) {
 186                         explain_class();
 187                         return -1;
 188                 } else {
 189                         fprintf(stderr, "HFSC: What is \"%s\" ?\n", *argv);
 190                         explain_class();
 191                         return -1;
 192                 }
 193                 argc--, argv++;
 194         }
 195
 196         if (!(rsc_ok || fsc_ok || usc_ok)) {
 197                 fprintf(stderr, "HFSC: no parameters given\n");
 198                 explain_class();
 199                 return -1;
 200         }
 201         if (usc_ok && !fsc_ok) {
 202                 fprintf(stderr, "HFSC: Upper-limit Service Curve without "
 203                                 "Link-Share Service Curve\n");
 204                 explain_class();
 205                 return -1;
 206         }
 207
 208         tail = NLMSG_TAIL(n);
 209
 210         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 211         if (rsc_ok)
 212                 addattr_l(n, 1024, TCA_HFSC_RSC, &rsc, sizeof(rsc));
 213         if (fsc_ok)
 214                 addattr_l(n, 1024, TCA_HFSC_FSC, &fsc, sizeof(fsc));
 215         if (usc_ok)
 216                 addattr_l(n, 1024, TCA_HFSC_USC, &usc, sizeof(usc));
 217
 218         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 219         return 0;
 220 }
 221
 222 static void
 223 hfsc_print_sc(FILE *f, char *name, struct tc_service_curve *sc)
 224 {
 225         SPRINT_BUF(b1);
 226
 227         fprintf(f, "%s ", name);
 228         fprintf(f, "m1 %s ", sprint_rate(sc->m1, b1));
 229         fprintf(f, "d %s ", sprint_usecs(sc->d, b1));
 230         fprintf(f, "m2 %s ", sprint_rate(sc->m2, b1));
 231 }
 232
 233 static int
 234 hfsc_print_class_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 235 {
 236         struct rtattr *tb[TCA_HFSC_MAX+1];
 237         struct tc_service_curve *rsc = NULL, *fsc = NULL, *usc = NULL;
 238
 239         if (opt == NULL)
 240                 return 0;
 241
 242         parse_rtattr_nested(tb, TCA_HFSC_MAX, opt);
 243
 244         if (tb[TCA_HFSC_RSC]) {
 245                 if (RTA_PAYLOAD(tb[TCA_HFSC_RSC]) < sizeof(*rsc))
 246                         fprintf(stderr, "HFSC: truncated realtime option\n");
 247                 else
 248                         rsc = RTA_DATA(tb[TCA_HFSC_RSC]);
 249         }
 250         if (tb[TCA_HFSC_FSC]) {
 251                 if (RTA_PAYLOAD(tb[TCA_HFSC_FSC]) < sizeof(*fsc))
 252                         fprintf(stderr, "HFSC: truncated linkshare option\n");
 253                 else
 254                         fsc = RTA_DATA(tb[TCA_HFSC_FSC]);
 255         }
 256         if (tb[TCA_HFSC_USC]) {
 257                 if (RTA_PAYLOAD(tb[TCA_HFSC_USC]) < sizeof(*usc))
 258                         fprintf(stderr, "HFSC: truncated upperlimit option\n");
 259                 else
 260                         usc = RTA_DATA(tb[TCA_HFSC_USC]);
 261         }
 262
 263
 264         if (rsc != NULL && fsc != NULL &&
 265             memcmp(rsc, fsc, sizeof(*rsc)) == 0)
 266                 hfsc_print_sc(f, "sc", rsc);
 267         else {
 268                 if (rsc != NULL)
 269                         hfsc_print_sc(f, "rt", rsc);
 270                 if (fsc != NULL)
 271                         hfsc_print_sc(f, "ls", fsc);
 272         }
 273         if (usc != NULL)
 274                 hfsc_print_sc(f, "ul", usc);
 275
 276         return 0;
 277 }
 278
 279 struct qdisc_util hfsc_qdisc_util = {
 280         .id             = "hfsc",
 281         .parse_qopt     = hfsc_parse_opt,
 282         .print_qopt     = hfsc_print_opt,
 283         .print_xstats   = hfsc_print_xstats,
 284         .parse_copt     = hfsc_parse_class_opt,
 285         .print_copt     = hfsc_print_class_opt,
 286 };
 287
 288 static int
 289 hfsc_get_sc1(int *argcp, char ***argvp, struct tc_service_curve *sc)
 290 {
 291         char **argv = *argvp;
 292         int argc = *argcp;
 293         unsigned int m1 = 0, d = 0, m2 = 0;
 294
 295         if (matches(*argv, "m1") == 0) {
 296                 NEXT_ARG();
 297                 if (get_rate(&m1, *argv) < 0) {
 298                         explain1("m1");
 299                         return -1;
 300                 }
 301                 NEXT_ARG();
 302         }
 303
 304         if (matches(*argv, "d") == 0) {
 305                 NEXT_ARG();
 306                 if (get_usecs(&d, *argv) < 0) {
 307                         explain1("d");
 308                         return -1;
 309                 }
 310                 NEXT_ARG();
 311         }
 312
 313         if (matches(*argv, "m2") == 0) {
 314                 NEXT_ARG();
 315                 if (get_rate(&m2, *argv) < 0) {
 316                         explain1("m2");
 317                         return -1;
 318                 }
 319         } else
 320                 return -1;
 321
 322         sc->m1 = m1;
 323         sc->d  = d;
 324         sc->m2 = m2;
 325
 326         *argvp = argv;
 327         *argcp = argc;
 328         return 0;
 329 }
 330
 331 static int
 332 hfsc_get_sc2(int *argcp, char ***argvp, struct tc_service_curve *sc)
 333 {
 334         char **argv = *argvp;
 335         int argc = *argcp;
 336         unsigned int umax = 0, dmax = 0, rate = 0;
 337
 338         if (matches(*argv, "umax") == 0) {
 339                 NEXT_ARG();
 340                 if (get_size(&umax, *argv) < 0) {
 341                         explain1("umax");
 342                         return -1;
 343                 }
 344                 NEXT_ARG();
 345         }
 346
 347         if (matches(*argv, "dmax") == 0) {
 348                 NEXT_ARG();
 349                 if (get_usecs(&dmax, *argv) < 0) {
 350                         explain1("dmax");
 351                         return -1;
 352                 }
 353                 NEXT_ARG();
 354         }
 355
 356         if (matches(*argv, "rate") == 0) {
 357                 NEXT_ARG();
 358                 if (get_rate(&rate, *argv) < 0) {
 359                         explain1("rate");
 360                         return -1;
 361                 }
 362         } else
 363                 return -1;
 364
 365         if (umax != 0 && dmax == 0) {
 366                 fprintf(stderr, "HFSC: umax given but dmax is zero.\n");
 367                 return -1;
 368         }
 369
 370         if (dmax != 0 && ceil(umax * 1000000.0 / dmax) > rate) {
 371                 /*
 372                  * concave curve, slope of first segment is umax/dmax,
 373                  * intersection is at dmax
 374                  */
 375                 sc->m1 = ceil(umax * 1000000.0 / dmax); /* in bps */
 376                 sc->d  = dmax;
 377                 sc->m2 = rate;
 378         } else {
 379                 /*
 380                  * convex curve, slope of first segment is 0, intersection
 381                  * is at dmax - umax / rate
 382                  */
 383                 sc->m1 = 0;
 384                 sc->d  = ceil(dmax - umax * 1000000.0 / rate); /* in usec */
 385                 sc->m2 = rate;
 386         }
 387
 388         *argvp = argv;
 389         *argcp = argc;
 390         return 0;
 391 }
 392
 393 static int
 394 hfsc_get_sc(int *argcp, char ***argvp, struct tc_service_curve *sc)
 395 {
 396         if (hfsc_get_sc1(argcp, argvp, sc) < 0 &&
 397             hfsc_get_sc2(argcp, argvp, sc) < 0)
 398                 return -1;
 399
 400         if (sc->m1 == 0 && sc->m2 == 0) {
 401                 fprintf(stderr, "HFSC: Service Curve has two zero slopes\n");
 402                 return -1;
 403         }
 404
 405         return 0;
 406 }