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 ] [ linklayer TYPE ]\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
  50 static int cbq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  51 {
  52         struct tc_ratespec r;
  53         struct tc_cbq_lssopt lss;
  54         __u32 rtab[256];
  55         unsigned mpu=0, avpkt=0, allot=0;
  56         unsigned short overhead=0;
  57         unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
  58         int cell_log=-1;
  59         int ewma_log=-1;
  60         struct rtattr *tail;
  61
  62         memset(&lss, 0, sizeof(lss));
  63         memset(&r, 0, sizeof(r));
  64
  65         while (argc > 0) {
  66                 if (matches(*argv, "bandwidth") == 0 ||
  67                     matches(*argv, "rate") == 0) {
  68                         NEXT_ARG();
  69                         if (get_rate(&r.rate, *argv)) {
  70                                 explain1("bandwidth");
  71                                 return -1;
  72                         }
  73                 } else if (matches(*argv, "ewma") == 0) {
  74                         NEXT_ARG();
  75                         if (get_integer(&ewma_log, *argv, 0)) {
  76                                 explain1("ewma");
  77                                 return -1;
  78                         }
  79                         if (ewma_log > 31) {
  80                                 fprintf(stderr, "ewma_log must be < 32\n");
  81                                 return -1;
  82                         }
  83                 } else if (matches(*argv, "cell") == 0) {
  84                         unsigned cell;
  85                         int i;
  86                         NEXT_ARG();
  87                         if (get_size(&cell, *argv)) {
  88                                 explain1("cell");
  89                                 return -1;
  90                         }
  91                         for (i=0; i<32; i++)
  92                                 if ((1<<i) == cell)
  93                                         break;
  94                         if (i>=32) {
  95                                 fprintf(stderr, "cell must be 2^n\n");
  96                                 return -1;
  97                         }
  98                         cell_log = i;
  99                 } else if (matches(*argv, "avpkt") == 0) {
 100                         NEXT_ARG();
 101                         if (get_size(&avpkt, *argv)) {
 102                                 explain1("avpkt");
 103                                 return -1;
 104                         }
 105                 } else if (matches(*argv, "mpu") == 0) {
 106                         NEXT_ARG();
 107                         if (get_size(&mpu, *argv)) {
 108                                 explain1("mpu");
 109                                 return -1;
 110                         }
 111                 } else if (matches(*argv, "allot") == 0) {
 112                         NEXT_ARG();
 113                         /* Accept and ignore "allot" for backward compatibility */
 114                         if (get_size(&allot, *argv)) {
 115                                 explain1("allot");
 116                                 return -1;
 117                         }
 118                 } else if (matches(*argv, "overhead") == 0) {
 119                         NEXT_ARG();
 120                         if (get_u16(&overhead, *argv, 10)) {
 121                                 explain1("overhead"); return -1;
 122                         }
 123                 } else if (matches(*argv, "linklayer") == 0) {
 124                         NEXT_ARG();
 125                         if (get_linklayer(&linklayer, *argv)) {
 126                                 explain1("linklayer"); return -1;
 127                         }
 128                 } else if (matches(*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         r.mpu = mpu;
 153         r.overhead = overhead;
 154         if (tc_calc_rtable(&r, rtab, cell_log, allot, linklayer) < 0) {
 155                 fprintf(stderr, "CBQ: failed to calculate rate table.\n");
 156                 return -1;
 157         }
 158
 159         if (ewma_log < 0)
 160                 ewma_log = TC_CBQ_DEF_EWMA;
 161         lss.ewma_log = ewma_log;
 162         lss.maxidle = tc_calc_xmittime(r.rate, avpkt);
 163         lss.change = TCF_CBQ_LSS_MAXIDLE|TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 164         lss.avpkt = avpkt;
 165
 166         tail = NLMSG_TAIL(n);
 167         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 168         addattr_l(n, 1024, TCA_CBQ_RATE, &r, sizeof(r));
 169         addattr_l(n, 1024, TCA_CBQ_LSSOPT, &lss, sizeof(lss));
 170         addattr_l(n, 3024, TCA_CBQ_RTAB, rtab, 1024);
 171         if (show_raw) {
 172                 int i;
 173                 for (i=0; i<256; i++)
 174                         printf("%u ", rtab[i]);
 175                 printf("\n");
 176         }
 177         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 178         return 0;
 179 }
 180
 181 static int cbq_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 182 {
 183         int wrr_ok=0, fopt_ok=0;
 184         struct tc_ratespec r;
 185         struct tc_cbq_lssopt lss;
 186         struct tc_cbq_wrropt wrr;
 187         struct tc_cbq_fopt fopt;
 188         struct tc_cbq_ovl ovl;
 189         __u32 rtab[256];
 190         unsigned mpu=0;
 191         int cell_log=-1;
 192         int ewma_log=-1;
 193         unsigned bndw = 0;
 194         unsigned minburst=0, maxburst=0;
 195         unsigned short overhead=0;
 196         unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
 197         struct rtattr *tail;
 198
 199         memset(&r, 0, sizeof(r));
 200         memset(&lss, 0, sizeof(lss));
 201         memset(&wrr, 0, sizeof(wrr));
 202         memset(&fopt, 0, sizeof(fopt));
 203         memset(&ovl, 0, sizeof(ovl));
 204
 205         while (argc > 0) {
 206                 if (matches(*argv, "rate") == 0) {
 207                         NEXT_ARG();
 208                         if (get_rate(&r.rate, *argv)) {
 209                                 explain1("rate");
 210                                 return -1;
 211                         }
 212                 } else if (matches(*argv, "bandwidth") == 0) {
 213                         NEXT_ARG();
 214                         if (get_rate(&bndw, *argv)) {
 215                                 explain1("bandwidth");
 216                                 return -1;
 217                         }
 218                 } else if (matches(*argv, "minidle") == 0) {
 219                         NEXT_ARG();
 220                         if (get_u32(&lss.minidle, *argv, 0)) {
 221                                 explain1("minidle");
 222                                 return -1;
 223                         }
 224                         lss.change |= TCF_CBQ_LSS_MINIDLE;
 225                 } else if (matches(*argv, "minburst") == 0) {
 226                         NEXT_ARG();
 227                         if (get_u32(&minburst, *argv, 0)) {
 228                                 explain1("minburst");
 229                                 return -1;
 230                         }
 231                         lss.change |= TCF_CBQ_LSS_OFFTIME;
 232                 } else if (matches(*argv, "maxburst") == 0) {
 233                         NEXT_ARG();
 234                         if (get_u32(&maxburst, *argv, 0)) {
 235                                 explain1("maxburst");
 236                                 return -1;
 237                         }
 238                         lss.change |= TCF_CBQ_LSS_MAXIDLE;
 239                 } else if (matches(*argv, "bounded") == 0) {
 240                         lss.flags |= TCF_CBQ_LSS_BOUNDED;
 241                         lss.change |= TCF_CBQ_LSS_FLAGS;
 242                 } else if (matches(*argv, "borrow") == 0) {
 243                         lss.flags &= ~TCF_CBQ_LSS_BOUNDED;
 244                         lss.change |= TCF_CBQ_LSS_FLAGS;
 245                 } else if (matches(*argv, "isolated") == 0) {
 246                         lss.flags |= TCF_CBQ_LSS_ISOLATED;
 247                         lss.change |= TCF_CBQ_LSS_FLAGS;
 248                 } else if (matches(*argv, "sharing") == 0) {
 249                         lss.flags &= ~TCF_CBQ_LSS_ISOLATED;
 250                         lss.change |= TCF_CBQ_LSS_FLAGS;
 251                 } else if (matches(*argv, "ewma") == 0) {
 252                         NEXT_ARG();
 253                         if (get_integer(&ewma_log, *argv, 0)) {
 254                                 explain1("ewma");
 255                                 return -1;
 256                         }
 257                         if (ewma_log > 31) {
 258                                 fprintf(stderr, "ewma_log must be < 32\n");
 259                                 return -1;
 260                         }
 261                         lss.change |= TCF_CBQ_LSS_EWMA;
 262                 } else if (matches(*argv, "cell") == 0) {
 263                         unsigned cell;
 264                         int i;
 265                         NEXT_ARG();
 266                         if (get_size(&cell, *argv)) {
 267                                 explain1("cell");
 268                                 return -1;
 269                         }
 270                         for (i=0; i<32; i++)
 271                                 if ((1<<i) == cell)
 272                                         break;
 273                         if (i>=32) {
 274                                 fprintf(stderr, "cell must be 2^n\n");
 275                                 return -1;
 276                         }
 277                         cell_log = i;
 278                 } else if (matches(*argv, "prio") == 0) {
 279                         unsigned prio;
 280                         NEXT_ARG();
 281                         if (get_u32(&prio, *argv, 0)) {
 282                                 explain1("prio");
 283                                 return -1;
 284                         }
 285                         if (prio > TC_CBQ_MAXPRIO) {
 286                                 fprintf(stderr, "\"prio\" must be number in the range 1...%d\n", TC_CBQ_MAXPRIO);
 287                                 return -1;
 288                         }
 289                         wrr.priority = prio;
 290                         wrr_ok++;
 291                 } else if (matches(*argv, "allot") == 0) {
 292                         NEXT_ARG();
 293                         if (get_size(&wrr.allot, *argv)) {
 294                                 explain1("allot");
 295                                 return -1;
 296                         }
 297                 } else if (matches(*argv, "avpkt") == 0) {
 298                         NEXT_ARG();
 299                         if (get_size(&lss.avpkt, *argv)) {
 300                                 explain1("avpkt");
 301                                 return -1;
 302                         }
 303                         lss.change |= TCF_CBQ_LSS_AVPKT;
 304                 } else if (matches(*argv, "mpu") == 0) {
 305                         NEXT_ARG();
 306                         if (get_size(&mpu, *argv)) {
 307                                 explain1("mpu");
 308                                 return -1;
 309                         }
 310                 } else if (matches(*argv, "weight") == 0) {
 311                         NEXT_ARG();
 312                         if (get_size(&wrr.weight, *argv)) {
 313                                 explain1("weight");
 314                                 return -1;
 315                         }
 316                         wrr_ok++;
 317                 } else if (matches(*argv, "split") == 0) {
 318                         NEXT_ARG();
 319                         if (get_tc_classid(&fopt.split, *argv)) {
 320                                 fprintf(stderr, "Invalid split node ID.\n");
 321                                 return -1;
 322                         }
 323                         fopt_ok++;
 324                 } else if (matches(*argv, "defmap") == 0) {
 325                         int err;
 326                         NEXT_ARG();
 327                         err = sscanf(*argv, "%08x/%08x", &fopt.defmap, &fopt.defchange);
 328                         if (err < 1) {
 329                                 fprintf(stderr, "Invalid defmap, should be MASK32[/MASK]\n");
 330                                 return -1;
 331                         }
 332                         if (err == 1)
 333                                 fopt.defchange = ~0;
 334                         fopt_ok++;
 335                 } else if (matches(*argv, "overhead") == 0) {
 336                         NEXT_ARG();
 337                         if (get_u16(&overhead, *argv, 10)) {
 338                                 explain1("overhead"); return -1;
 339                         }
 340                 } else if (matches(*argv, "linklayer") == 0) {
 341                         NEXT_ARG();
 342                         if (get_linklayer(&linklayer, *argv)) {
 343                                 explain1("linklayer"); return -1;
 344                         }
 345                 } else if (matches(*argv, "help") == 0) {
 346                         explain_class();
 347                         return -1;
 348                 } else {
 349                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 350                         explain_class();
 351                         return -1;
 352                 }
 353                 argc--; argv++;
 354         }
 355
 356         /* OK. All options are parsed. */
 357
 358         /* 1. Prepare link sharing scheduler parameters */
 359         if (r.rate) {
 360                 unsigned pktsize = wrr.allot;
 361                 if (wrr.allot < (lss.avpkt*3)/2)
 362                         wrr.allot = (lss.avpkt*3)/2;
 363                 r.mpu = mpu;
 364                 r.overhead = overhead;
 365                 if (tc_calc_rtable(&r, rtab, cell_log, pktsize, linklayer) < 0) {
 366                         fprintf(stderr, "CBQ: failed to calculate rate table.\n");
 367                         return -1;
 368                 }
 369         }
 370         if (ewma_log < 0)
 371                 ewma_log = TC_CBQ_DEF_EWMA;
 372         lss.ewma_log = ewma_log;
 373         if (lss.change&(TCF_CBQ_LSS_OFFTIME|TCF_CBQ_LSS_MAXIDLE)) {
 374                 if (lss.avpkt == 0) {
 375                         fprintf(stderr, "CBQ: avpkt is required for max/minburst.\n");
 376                         return -1;
 377                 }
 378                 if (bndw==0 || r.rate == 0) {
 379                         fprintf(stderr, "CBQ: bandwidth&rate are required for max/minburst.\n");
 380                         return -1;
 381                 }
 382         }
 383         if (wrr.priority == 0 && (n->nlmsg_flags&NLM_F_EXCL)) {
 384                 wrr_ok = 1;
 385                 wrr.priority = TC_CBQ_MAXPRIO;
 386                 if (wrr.allot == 0)
 387                         wrr.allot = (lss.avpkt*3)/2;
 388         }
 389         if (wrr_ok) {
 390                 if (wrr.weight == 0)
 391                         wrr.weight = (wrr.priority == TC_CBQ_MAXPRIO) ? 1 : r.rate;
 392                 if (wrr.allot == 0) {
 393                         fprintf(stderr, "CBQ: \"allot\" is required to set WRR parameters.\n");
 394                         return -1;
 395                 }
 396         }
 397         if (lss.change&TCF_CBQ_LSS_MAXIDLE) {
 398                 lss.maxidle = tc_cbq_calc_maxidle(bndw, r.rate, lss.avpkt, ewma_log, maxburst);
 399                 lss.change |= TCF_CBQ_LSS_MAXIDLE;
 400                 lss.change |= TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 401         }
 402         if (lss.change&TCF_CBQ_LSS_OFFTIME) {
 403                 lss.offtime = tc_cbq_calc_offtime(bndw, r.rate, lss.avpkt, ewma_log, minburst);
 404                 lss.change |= TCF_CBQ_LSS_OFFTIME;
 405                 lss.change |= TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 406         }
 407         if (lss.change&TCF_CBQ_LSS_MINIDLE) {
 408                 lss.minidle <<= lss.ewma_log;
 409                 lss.change |= TCF_CBQ_LSS_EWMA;
 410         }
 411
 412         tail = NLMSG_TAIL(n);
 413         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 414         if (lss.change) {
 415                 lss.change |= TCF_CBQ_LSS_FLAGS;
 416                 addattr_l(n, 1024, TCA_CBQ_LSSOPT, &lss, sizeof(lss));
 417         }
 418         if (wrr_ok)
 419                 addattr_l(n, 1024, TCA_CBQ_WRROPT, &wrr, sizeof(wrr));
 420         if (fopt_ok)
 421                 addattr_l(n, 1024, TCA_CBQ_FOPT, &fopt, sizeof(fopt));
 422         if (r.rate) {
 423                 addattr_l(n, 1024, TCA_CBQ_RATE, &r, sizeof(r));
 424                 addattr_l(n, 3024, TCA_CBQ_RTAB, rtab, 1024);
 425                 if (show_raw) {
 426                         int i;
 427                         for (i=0; i<256; i++)
 428                                 printf("%u ", rtab[i]);
 429                         printf("\n");
 430                 }
 431         }
 432         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 433         return 0;
 434 }
 435
 436
 437 static int cbq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 438 {
 439         struct rtattr *tb[TCA_CBQ_MAX+1];
 440         struct tc_ratespec *r = NULL;
 441         struct tc_cbq_lssopt *lss = NULL;
 442         struct tc_cbq_wrropt *wrr = NULL;
 443         struct tc_cbq_fopt *fopt = NULL;
 444         struct tc_cbq_ovl *ovl = NULL;
 445         SPRINT_BUF(b1);
 446
 447         if (opt == NULL)
 448                 return 0;
 449
 450         parse_rtattr_nested(tb, TCA_CBQ_MAX, opt);
 451
 452         if (tb[TCA_CBQ_RATE]) {
 453                 if (RTA_PAYLOAD(tb[TCA_CBQ_RATE]) < sizeof(*r))
 454                         fprintf(stderr, "CBQ: too short rate opt\n");
 455                 else
 456                         r = RTA_DATA(tb[TCA_CBQ_RATE]);
 457         }
 458         if (tb[TCA_CBQ_LSSOPT]) {
 459                 if (RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT]) < sizeof(*lss))
 460                         fprintf(stderr, "CBQ: too short lss opt\n");
 461                 else
 462                         lss = RTA_DATA(tb[TCA_CBQ_LSSOPT]);
 463         }
 464         if (tb[TCA_CBQ_WRROPT]) {
 465                 if (RTA_PAYLOAD(tb[TCA_CBQ_WRROPT]) < sizeof(*wrr))
 466                         fprintf(stderr, "CBQ: too short wrr opt\n");
 467                 else
 468                         wrr = RTA_DATA(tb[TCA_CBQ_WRROPT]);
 469         }
 470         if (tb[TCA_CBQ_FOPT]) {
 471                 if (RTA_PAYLOAD(tb[TCA_CBQ_FOPT]) < sizeof(*fopt))
 472                         fprintf(stderr, "CBQ: too short fopt\n");
 473                 else
 474                         fopt = RTA_DATA(tb[TCA_CBQ_FOPT]);
 475         }
 476         if (tb[TCA_CBQ_OVL_STRATEGY]) {
 477                 if (RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]) < sizeof(*ovl))
 478                         fprintf(stderr, "CBQ: too short overlimit strategy %u/%u\n",
 479                                 (unsigned) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
 480                                 (unsigned) sizeof(*ovl));
 481                 else
 482                         ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
 483         }
 484
 485         if (r) {
 486                 char buf[64];
 487                 print_rate(buf, sizeof(buf), r->rate);
 488                 fprintf(f, "rate %s ", buf);
 489                 if (show_details) {
 490                         fprintf(f, "cell %ub ", 1<<r->cell_log);
 491                         if (r->mpu)
 492                                 fprintf(f, "mpu %ub ", r->mpu);
 493                         if (r->overhead)
 494                                 fprintf(f, "overhead %ub ", r->overhead);
 495                 }
 496         }
 497         if (lss && lss->flags) {
 498                 int comma=0;
 499                 fprintf(f, "(");
 500                 if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
 501                         fprintf(f, "bounded");
 502                         comma=1;
 503                 }
 504                 if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
 505                         if (comma)
 506                                 fprintf(f, ",");
 507                         fprintf(f, "isolated");
 508                 }
 509                 fprintf(f, ") ");
 510         }
 511         if (wrr) {
 512                 if (wrr->priority != TC_CBQ_MAXPRIO)
 513                         fprintf(f, "prio %u", wrr->priority);
 514                 else
 515                         fprintf(f, "prio no-transmit");
 516                 if (show_details) {
 517                         char buf[64];
 518                         fprintf(f, "/%u ", wrr->cpriority);
 519                         if (wrr->weight != 1) {
 520                                 print_rate(buf, sizeof(buf), wrr->weight);
 521                                 fprintf(f, "weight %s ", buf);
 522                         }
 523                         if (wrr->allot)
 524                                 fprintf(f, "allot %ub ", wrr->allot);
 525                 }
 526         }
 527         if (lss && show_details) {
 528                 fprintf(f, "\nlevel %u ewma %u avpkt %ub ", lss->level, lss->ewma_log, lss->avpkt);
 529                 if (lss->maxidle) {
 530                         fprintf(f, "maxidle %s ", sprint_ticks(lss->maxidle>>lss->ewma_log, b1));
 531                         if (show_raw)
 532                                 fprintf(f, "[%08x] ", lss->maxidle);
 533                 }
 534                 if (lss->minidle!=0x7fffffff) {
 535                         fprintf(f, "minidle %s ", sprint_ticks(lss->minidle>>lss->ewma_log, b1));
 536                         if (show_raw)
 537                                 fprintf(f, "[%08x] ", lss->minidle);
 538                 }
 539                 if (lss->offtime) {
 540                         fprintf(f, "offtime %s ", sprint_ticks(lss->offtime, b1));
 541                         if (show_raw)
 542                                 fprintf(f, "[%08x] ", lss->offtime);
 543                 }
 544         }
 545         if (fopt && show_details) {
 546                 char buf[64];
 547                 print_tc_classid(buf, sizeof(buf), fopt->split);
 548                 fprintf(f, "\nsplit %s ", buf);
 549                 if (fopt->defmap) {
 550                         fprintf(f, "defmap %08x", fopt->defmap);
 551                 }
 552         }
 553         return 0;
 554 }
 555
 556 static int cbq_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 557 {
 558         struct tc_cbq_xstats *st;
 559
 560         if (xstats == NULL)
 561                 return 0;
 562
 563         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 564                 return -1;
 565
 566         st = RTA_DATA(xstats);
 567         fprintf(f, "  borrowed %u overactions %u avgidle %g undertime %g", st->borrows,
 568                 st->overactions, (double)st->avgidle, (double)st->undertime);
 569         return 0;
 570 }
 571
 572 struct qdisc_util cbq_qdisc_util = {
 573         .id             = "cbq",
 574         .parse_qopt     = cbq_parse_opt,
 575         .print_qopt     = cbq_print_opt,
 576         .print_xstats   = cbq_print_xstats,
 577         .parse_copt     = cbq_parse_class_opt,
 578         .print_copt     = cbq_print_opt,
 579 };
 580