release/src/router/iproute2/tc/q_cbq.c

   1 /*
   2  * q_cbq.c              CBQ.
   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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  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
  23 #include "utils.h"
  24 #include "tc_util.h"
  25 #include "tc_cbq.h"
  26
  27 static void explain_class(void)
  28 {
  29         fprintf(stderr, "Usage: ... cbq bandwidth BPS rate BPS maxburst PKTS [ avpkt BYTES ]\n");
  30         fprintf(stderr, "               [ minburst PKTS ] [ bounded ] [ isolated ]\n");
  31         fprintf(stderr, "               [ allot BYTES ] [ mpu BYTES ] [ weight RATE ]\n");
  32         fprintf(stderr, "               [ prio NUMBER ] [ cell BYTES ] [ ewma LOG ]\n");
  33         fprintf(stderr, "               [ estimator INTERVAL TIME_CONSTANT ]\n");
  34         fprintf(stderr, "               [ split CLASSID ] [ defmap MASK/CHANGE ]\n");
  35         fprintf(stderr, "               [ overhead BYTES ] [ atm ]\n");
  36 }
  37
  38 static void explain(void)
  39 {
  40         fprintf(stderr, "Usage: ... cbq bandwidth BPS avpkt BYTES [ mpu BYTES ]\n");
  41         fprintf(stderr, "               [ cell BYTES ] [ ewma LOG ]\n");
  42 }
  43
  44 static void explain1(char *arg)
  45 {
  46         fprintf(stderr, "Illegal \"%s\"\n", arg);
  47 }
  48
  49 #define usage() return(-1)
  50
  51 static int cbq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  52 {
  53         struct tc_ratespec r;
  54         struct tc_cbq_lssopt lss;
  55         __u32 rtab[256];
  56         unsigned avpkt=0, allot=0;
  57         __u8 mpu=0;
  58         __s8 overhead=0;
  59         int atm=0;
  60         int cell_log=-1;
  61         int ewma_log=-1;
  62         struct rtattr *tail;
  63
  64         memset(&lss, 0, sizeof(lss));
  65         memset(&r, 0, sizeof(r));
  66
  67         while (argc > 0) {
  68                 if (strcmp(*argv, "bandwidth") == 0 ||
  69                     strcmp(*argv, "rate") == 0) {
  70                         NEXT_ARG();
  71                         if (get_rate(&r.rate, *argv)) {
  72                                 explain1("bandwidth");
  73                                 return -1;
  74                         }
  75                 } else if (strcmp(*argv, "ewma") == 0) {
  76                         NEXT_ARG();
  77                         if (get_integer(&ewma_log, *argv, 0)) {
  78                                 explain1("ewma");
  79                                 return -1;
  80                         }
  81                         if (ewma_log > 31) {
  82                                 fprintf(stderr, "ewma_log must be < 32\n");
  83                                 return -1;
  84                         }
  85                 } else if (strcmp(*argv, "cell") == 0) {
  86                         unsigned cell;
  87                         int i;
  88                         NEXT_ARG();
  89                         if (get_size(&cell, *argv)) {
  90                                 explain1("cell");
  91                                 return -1;
  92                         }
  93                         for (i=0; i<32; i++)
  94                                 if ((1<<i) == cell)
  95                                         break;
  96                         if (i>=32) {
  97                                 fprintf(stderr, "cell must be 2^n\n");
  98                                 return -1;
  99                         }
 100                         cell_log = i;
 101                 } else if (strcmp(*argv, "avpkt") == 0) {
 102                         NEXT_ARG();
 103                         if (get_size(&avpkt, *argv)) {
 104                                 explain1("avpkt");
 105                                 return -1;
 106                         }
 107                 } else if (strcmp(*argv, "mpu") == 0) {
 108                         NEXT_ARG();
 109                         if (get_u8(&mpu, *argv, 10)) {
 110                                 explain1("mpu");
 111                                 return -1;
 112                         }
 113                 } else if (strcmp(*argv, "allot") == 0) {
 114                         NEXT_ARG();
 115                         /* Accept and ignore "allot" for backward compatibility */
 116                         if (get_size(&allot, *argv)) {
 117                                 explain1("allot");
 118                                 return -1;
 119                         }
 120                 } else if (strcmp(*argv, "overhead") == 0) {
 121                         NEXT_ARG();
 122                         if (get_s8(&overhead, *argv, 10)) {
 123                                 explain1("overhead");
 124                                 return -1;
 125                         }
 126                 } else if (strcmp(*argv, "atm") == 0) {
 127                         atm = 1;
 128                 } else if (strcmp(*argv, "help") == 0) {
 129                         explain();
 130                         return -1;
 131                 } else {
 132                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 133                         explain();
 134                         return -1;
 135                 }
 136                 argc--; argv++;
 137         }
 138
 139         /* OK. All options are parsed. */
 140
 141         if (r.rate == 0) {
 142                 fprintf(stderr, "CBQ: bandwidth is required parameter.\n");
 143                 return -1;
 144         }
 145         if (avpkt == 0) {
 146                 fprintf(stderr, "CBQ: \"avpkt\" is required.\n");
 147                 return -1;
 148         }
 149         if (allot < (avpkt*3)/2)
 150                 allot = (avpkt*3)/2;
 151
 152         tc_calc_ratespec(&r, rtab, r.rate, cell_log, allot, mpu, atm, overhead);
 153
 154         if (ewma_log < 0)
 155                 ewma_log = TC_CBQ_DEF_EWMA;
 156         lss.ewma_log = ewma_log;
 157         lss.maxidle = tc_cbq_calc_maxidle(r.rate, r.rate, avpkt, lss.ewma_log, 0);
 158         lss.change = TCF_CBQ_LSS_MAXIDLE|TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 159         lss.avpkt = avpkt;
 160
 161         tail = NLMSG_TAIL(n);
 162         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 163         addattr_l(n, 1024, TCA_CBQ_RATE, &r, sizeof(r));
 164         addattr_l(n, 1024, TCA_CBQ_LSSOPT, &lss, sizeof(lss));
 165         addattr_l(n, 3024, TCA_CBQ_RTAB, rtab, 1024);
 166         if (show_raw) {
 167                 int i;
 168                 for (i=0; i<256; i++)
 169                         printf("%u ", rtab[i]);
 170                 printf("\n");
 171         }
 172         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 173         return 0;
 174 }
 175
 176 static int cbq_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 177 {
 178         int wrr_ok=0, fopt_ok=0;
 179         struct tc_ratespec r;
 180         struct tc_cbq_lssopt lss;
 181         struct tc_cbq_wrropt wrr;
 182         struct tc_cbq_fopt fopt;
 183         struct tc_cbq_ovl ovl;
 184         __u32 rtab[256];
 185         __u8 mpu=0;
 186         __s8 overhead = 0;
 187         int atm = 0;
 188         int cell_log=-1;
 189         int ewma_log=-1;
 190         unsigned bndw = 0;
 191         unsigned minburst=0, maxburst=0;
 192         struct rtattr *tail;
 193
 194         memset(&r, 0, sizeof(r));
 195         memset(&lss, 0, sizeof(lss));
 196         memset(&wrr, 0, sizeof(wrr));
 197         memset(&fopt, 0, sizeof(fopt));
 198         memset(&ovl, 0, sizeof(ovl));
 199
 200         while (argc > 0) {
 201                 if (strcmp(*argv, "rate") == 0) {
 202                         NEXT_ARG();
 203                         if (get_rate(&r.rate, *argv)) {
 204                                 explain1("rate");
 205                                 return -1;
 206                         }
 207                 } else if (strcmp(*argv, "bandwidth") == 0) {
 208                         NEXT_ARG();
 209                         if (get_rate(&bndw, *argv)) {
 210                                 explain1("bandwidth");
 211                                 return -1;
 212                         }
 213                 } else if (strcmp(*argv, "minidle") == 0) {
 214                         NEXT_ARG();
 215                         if (get_u32(&lss.minidle, *argv, 0)) {
 216                                 explain1("minidle");
 217                                 return -1;
 218                         }
 219                         lss.change |= TCF_CBQ_LSS_MINIDLE;
 220                 } else if (strcmp(*argv, "minburst") == 0) {
 221                         NEXT_ARG();
 222                         if (get_u32(&minburst, *argv, 0)) {
 223                                 explain1("minburst");
 224                                 return -1;
 225                         }
 226                         lss.change |= TCF_CBQ_LSS_OFFTIME;
 227                 } else if (strcmp(*argv, "maxburst") == 0) {
 228                         NEXT_ARG();
 229                         if (get_u32(&maxburst, *argv, 0)) {
 230                                 explain1("maxburst");
 231                                 return -1;
 232                         }
 233                         lss.change |= TCF_CBQ_LSS_MAXIDLE;
 234                 } else if (strcmp(*argv, "bounded") == 0) {
 235                         lss.flags |= TCF_CBQ_LSS_BOUNDED;
 236                         lss.change |= TCF_CBQ_LSS_FLAGS;
 237                 } else if (strcmp(*argv, "borrow") == 0) {
 238                         lss.flags &= ~TCF_CBQ_LSS_BOUNDED;
 239                         lss.change |= TCF_CBQ_LSS_FLAGS;
 240                 } else if (strcmp(*argv, "isolated") == 0) {
 241                         lss.flags |= TCF_CBQ_LSS_ISOLATED;
 242                         lss.change |= TCF_CBQ_LSS_FLAGS;
 243                 } else if (strcmp(*argv, "sharing") == 0) {
 244                         lss.flags &= ~TCF_CBQ_LSS_ISOLATED;
 245                         lss.change |= TCF_CBQ_LSS_FLAGS;
 246                 } else if (strcmp(*argv, "ewma") == 0) {
 247                         NEXT_ARG();
 248                         if (get_integer(&ewma_log, *argv, 0)) {
 249                                 explain1("ewma");
 250                                 return -1;
 251                         }
 252                         if (ewma_log > 31) {
 253                                 fprintf(stderr, "ewma_log must be < 32\n");
 254                                 return -1;
 255                         }
 256                         lss.change |= TCF_CBQ_LSS_EWMA;
 257                 } else if (strcmp(*argv, "cell") == 0) {
 258                         unsigned cell;
 259                         int i;
 260                         NEXT_ARG();
 261                         if (get_size(&cell, *argv)) {
 262                                 explain1("cell");
 263                                 return -1;
 264                         }
 265                         for (i=0; i<32; i++)
 266                                 if ((1<<i) == cell)
 267                                         break;
 268                         if (i>=32) {
 269                                 fprintf(stderr, "cell must be 2^n\n");
 270                                 return -1;
 271                         }
 272                         cell_log = i;
 273                 } else if (strcmp(*argv, "prio") == 0) {
 274                         unsigned prio;
 275                         NEXT_ARG();
 276                         if (get_u32(&prio, *argv, 0)) {
 277                                 explain1("prio");
 278                                 return -1;
 279                         }
 280                         if (prio > TC_CBQ_MAXPRIO) {
 281                                 fprintf(stderr, "\"prio\" must be number in the range 1...%d\n", TC_CBQ_MAXPRIO);
 282                                 return -1;
 283                         }
 284                         wrr.priority = prio;
 285                         wrr_ok++;
 286                 } else if (strcmp(*argv, "allot") == 0) {
 287                         NEXT_ARG();
 288                         if (get_size(&wrr.allot, *argv)) {
 289                                 explain1("allot");
 290                                 return -1;
 291                         }
 292                 } else if (strcmp(*argv, "avpkt") == 0) {
 293                         NEXT_ARG();
 294                         if (get_size(&lss.avpkt, *argv)) {
 295                                 explain1("avpkt");
 296                                 return -1;
 297                         }
 298                         lss.change |= TCF_CBQ_LSS_AVPKT;
 299                 } else if (strcmp(*argv, "mpu") == 0) {
 300                         NEXT_ARG();
 301                         if (get_u8(&mpu, *argv, 10)) {
 302                                 explain1("mpu");
 303                                 return -1;
 304                         }
 305                 } else if (strcmp(*argv, "overhead") == 0) {
 306                         NEXT_ARG();
 307                         if (get_s8(&overhead, *argv, 10)) {
 308                                 explain1("overhead");
 309                                 return -1;
 310                         }
 311                 } else if (strcmp(*argv, "atm") == 0) {
 312                         atm = 1;
 313                 } else if (strcmp(*argv, "weight") == 0) {
 314                         NEXT_ARG();
 315                         if (get_size(&wrr.weight, *argv)) {
 316                                 explain1("weight");
 317                                 return -1;
 318                         }
 319                         wrr_ok++;
 320                 } else if (strcmp(*argv, "split") == 0) {
 321                         NEXT_ARG();
 322                         if (get_tc_classid(&fopt.split, *argv)) {
 323                                 fprintf(stderr, "Invalid split node ID.\n");
 324                                 usage();
 325                         }
 326                         fopt_ok++;
 327                 } else if (strcmp(*argv, "defmap") == 0) {
 328                         int err;
 329                         NEXT_ARG();
 330                         err = sscanf(*argv, "%08x/%08x", &fopt.defmap, &fopt.defchange);
 331                         if (err < 1) {
 332                                 fprintf(stderr, "Invalid defmap, should be MASK32[/MASK]\n");
 333                                 return -1;
 334                         }
 335                         if (err == 1)
 336                                 fopt.defchange = ~0;
 337                         fopt_ok++;
 338                 } else if (strcmp(*argv, "help") == 0) {
 339                         explain_class();
 340                         return -1;
 341                 } else {
 342                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 343                         explain_class();
 344                         return -1;
 345                 }
 346                 argc--; argv++;
 347         }
 348
 349         /* OK. All options are parsed. */
 350
 351         /* 1. Prepare link sharing scheduler parameters */
 352         if (r.rate) {
 353                 unsigned pktsize = wrr.allot;
 354                 if (wrr.allot < (lss.avpkt*3)/2)
 355                         wrr.allot = (lss.avpkt*3)/2;
 356
 357                 tc_calc_ratespec(&r, rtab, r.rate, cell_log, pktsize, mpu, atm, overhead);
 358         }
 359         if (ewma_log < 0)
 360                 ewma_log = TC_CBQ_DEF_EWMA;
 361         lss.ewma_log = ewma_log;
 362         if (lss.change&(TCF_CBQ_LSS_OFFTIME|TCF_CBQ_LSS_MAXIDLE)) {
 363                 if (lss.avpkt == 0) {
 364                         fprintf(stderr, "CBQ: avpkt is required for max/minburst.\n");
 365                         return -1;
 366                 }
 367                 if (bndw==0 || r.rate == 0) {
 368                         fprintf(stderr, "CBQ: bandwidth&rate are required for max/minburst.\n");
 369                         return -1;
 370                 }
 371         }
 372         if (wrr.priority == 0 && (n->nlmsg_flags&NLM_F_EXCL)) {
 373                 wrr_ok = 1;
 374                 wrr.priority = TC_CBQ_MAXPRIO;
 375                 if (wrr.allot == 0)
 376                         wrr.allot = (lss.avpkt*3)/2;
 377         }
 378         if (wrr_ok) {
 379                 if (wrr.weight == 0)
 380                         wrr.weight = (wrr.priority == TC_CBQ_MAXPRIO) ? 1 : r.rate;
 381                 if (wrr.allot == 0) {
 382                         fprintf(stderr, "CBQ: \"allot\" is required to set WRR parameters.\n");
 383                         return -1;
 384                 }
 385         }
 386         if (lss.change&TCF_CBQ_LSS_MAXIDLE) {
 387                 lss.maxidle = tc_cbq_calc_maxidle(bndw, r.rate, lss.avpkt, ewma_log, maxburst);
 388                 lss.change |= TCF_CBQ_LSS_MAXIDLE;
 389                 lss.change |= TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 390         }
 391         if (lss.change&TCF_CBQ_LSS_OFFTIME) {
 392                 lss.offtime = tc_cbq_calc_offtime(bndw, r.rate, lss.avpkt, ewma_log, minburst);
 393                 lss.change |= TCF_CBQ_LSS_OFFTIME;
 394                 lss.change |= TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 395         }
 396         if (lss.change&TCF_CBQ_LSS_MINIDLE) {
 397                 lss.minidle <<= lss.ewma_log;
 398                 lss.change |= TCF_CBQ_LSS_EWMA;
 399         }
 400
 401         tail = NLMSG_TAIL(n);
 402         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 403         if (lss.change) {
 404                 lss.change |= TCF_CBQ_LSS_FLAGS;
 405                 addattr_l(n, 1024, TCA_CBQ_LSSOPT, &lss, sizeof(lss));
 406         }
 407         if (wrr_ok)
 408                 addattr_l(n, 1024, TCA_CBQ_WRROPT, &wrr, sizeof(wrr));
 409         if (fopt_ok)
 410                 addattr_l(n, 1024, TCA_CBQ_FOPT, &fopt, sizeof(fopt));
 411         if (r.rate) {
 412                 addattr_l(n, 1024, TCA_CBQ_RATE, &r, sizeof(r));
 413                 addattr_l(n, 3024, TCA_CBQ_RTAB, rtab, 1024);
 414                 if (show_raw) {
 415                         int i;
 416                         for (i=0; i<256; i++)
 417                                 printf("%u ", rtab[i]);
 418                         printf("\n");
 419                 }
 420         }
 421         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 422         return 0;
 423 }
 424
 425
 426 static int cbq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 427 {
 428         struct rtattr *tb[TCA_CBQ_MAX+1];
 429         struct tc_ratespec *r = NULL;
 430         struct tc_cbq_lssopt *lss = NULL;
 431         struct tc_cbq_wrropt *wrr = NULL;
 432         struct tc_cbq_fopt *fopt = NULL;
 433         struct tc_cbq_ovl *ovl = NULL;
 434
 435         if (opt == NULL)
 436                 return 0;
 437
 438         parse_rtattr_nested(tb, TCA_CBQ_MAX, opt);
 439
 440         if (tb[TCA_CBQ_RATE]) {
 441                 if (RTA_PAYLOAD(tb[TCA_CBQ_RATE]) < sizeof(*r))
 442                         fprintf(stderr, "CBQ: too short rate opt\n");
 443                 else
 444                         r = RTA_DATA(tb[TCA_CBQ_RATE]);
 445         }
 446         if (tb[TCA_CBQ_LSSOPT]) {
 447                 if (RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT]) < sizeof(*lss))
 448                         fprintf(stderr, "CBQ: too short lss opt\n");
 449                 else
 450                         lss = RTA_DATA(tb[TCA_CBQ_LSSOPT]);
 451         }
 452         if (tb[TCA_CBQ_WRROPT]) {
 453                 if (RTA_PAYLOAD(tb[TCA_CBQ_WRROPT]) < sizeof(*wrr))
 454                         fprintf(stderr, "CBQ: too short wrr opt\n");
 455                 else
 456                         wrr = RTA_DATA(tb[TCA_CBQ_WRROPT]);
 457         }
 458         if (tb[TCA_CBQ_FOPT]) {
 459                 if (RTA_PAYLOAD(tb[TCA_CBQ_FOPT]) < sizeof(*fopt))
 460                         fprintf(stderr, "CBQ: too short fopt\n");
 461                 else
 462                         fopt = RTA_DATA(tb[TCA_CBQ_FOPT]);
 463         }
 464         if (tb[TCA_CBQ_OVL_STRATEGY]) {
 465                 if (RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]) < sizeof(*ovl))
 466                         fprintf(stderr, "CBQ: too short overlimit strategy %u/%u\n",
 467                                 (unsigned) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
 468                                 (unsigned) sizeof(*ovl));
 469                 else
 470                         ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
 471         }
 472
 473         if (r) {
 474                 char buf[64];
 475                 print_rate(buf, sizeof(buf), r->rate);
 476                 fprintf(f, "rate %s ", buf);
 477                 if (show_details) {
 478                         fprintf(f, "cell %ub ", 1<<r->cell_log);
 479                         if (r->mpu & 0xff)
 480                                 fprintf(f, "mpu %ub ", (__u8)r->mpu);
 481                         if ((r->mpu >> 8))
 482                                 fprintf(f, "overhead %db ", (__s8)(r->mpu >> 8));
 483                         if (r->feature & 0x0001)
 484                                 fprintf(f, "atm ");
 485                 }
 486         }
 487         if (lss && lss->flags) {
 488                 int comma=0;
 489                 fprintf(f, "(");
 490                 if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
 491                         fprintf(f, "bounded");
 492                         comma=1;
 493                 }
 494                 if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
 495                         if (comma)
 496                                 fprintf(f, ",");
 497                         fprintf(f, "isolated");
 498                 }
 499                 fprintf(f, ") ");
 500         }
 501         if (wrr) {
 502                 if (wrr->priority != TC_CBQ_MAXPRIO)
 503                         fprintf(f, "prio %u", wrr->priority);
 504                 else
 505                         fprintf(f, "prio no-transmit");
 506                 if (show_details) {
 507                         char buf[64];
 508                         fprintf(f, "/%u ", wrr->cpriority);
 509                         if (wrr->weight != 1) {
 510                                 print_rate(buf, sizeof(buf), wrr->weight);
 511                                 fprintf(f, "weight %s ", buf);
 512                         }
 513                         if (wrr->allot)
 514                                 fprintf(f, "allot %ub ", wrr->allot);
 515                 }
 516         }
 517         if (lss && show_details) {
 518                 fprintf(f, "\nlevel %u ewma %u avpkt %ub ", lss->level, lss->ewma_log, lss->avpkt);
 519                 if (lss->maxidle) {
 520                         fprintf(f, "maxidle %luus ", tc_core_tick2usec(lss->maxidle>>lss->ewma_log));
 521                         if (show_raw)
 522                                 fprintf(f, "[%08x] ", lss->maxidle);
 523                 }
 524                 if (lss->minidle!=0x7fffffff) {
 525                         fprintf(f, "minidle %luus ", tc_core_tick2usec(lss->minidle>>lss->ewma_log));
 526                         if (show_raw)
 527                                 fprintf(f, "[%08x] ", lss->minidle);
 528                 }
 529                 if (lss->offtime) {
 530                         fprintf(f, "offtime %luus ", tc_core_tick2usec(lss->offtime));
 531                         if (show_raw)
 532                                 fprintf(f, "[%08x] ", lss->offtime);
 533                 }
 534         }
 535         if (fopt && show_details) {
 536                 char buf[64];
 537                 print_tc_classid(buf, sizeof(buf), fopt->split);
 538                 fprintf(f, "\nsplit %s ", buf);
 539                 if (fopt->defmap) {
 540                         fprintf(f, "defmap %08x", fopt->defmap);
 541                 }
 542         }
 543         return 0;
 544 }
 545
 546 static int cbq_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 547 {
 548         struct tc_cbq_xstats *st;
 549
 550         if (xstats == NULL)
 551                 return 0;
 552
 553         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 554                 return -1;
 555
 556         st = RTA_DATA(xstats);
 557         fprintf(f, "  borrowed %u overactions %u avgidle %g undertime %g", st->borrows,
 558                 st->overactions, (double)st->avgidle, (double)st->undertime);
 559         return 0;
 560 }
 561
 562 struct qdisc_util cbq_qdisc_util = {
 563         .id             = "cbq",
 564         .parse_qopt     = cbq_parse_opt,
 565         .print_qopt     = cbq_print_opt,
 566         .print_xstats   = cbq_print_xstats,
 567         .parse_copt     = cbq_parse_class_opt,
 568         .print_copt     = cbq_print_opt,
 569 };
 570