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         while (argc > 0) {
  63                 if (matches(*argv, "bandwidth") == 0 ||
  64                     matches(*argv, "rate") == 0) {
  65                         NEXT_ARG();
  66                         if (get_rate(&r.rate, *argv)) {
  67                                 explain1("bandwidth");
  68                                 return -1;
  69                         }
  70                 } else if (matches(*argv, "ewma") == 0) {
  71                         NEXT_ARG();
  72                         if (get_integer(&ewma_log, *argv, 0)) {
  73                                 explain1("ewma");
  74                                 return -1;
  75                         }
  76                         if (ewma_log > 31) {
  77                                 fprintf(stderr, "ewma_log must be < 32\n");
  78                                 return -1;
  79                         }
  80                 } else if (matches(*argv, "cell") == 0) {
  81                         unsigned int cell;
  82                         int i;
  83
  84                         NEXT_ARG();
  85                         if (get_size(&cell, *argv)) {
  86                                 explain1("cell");
  87                                 return -1;
  88                         }
  89                         for (i = 0; i < 32; i++)
  90                                 if ((1<<i) == cell)
  91                                         break;
  92                         if (i >= 32) {
  93                                 fprintf(stderr, "cell must be 2^n\n");
  94                                 return -1;
  95                         }
  96                         cell_log = i;
  97                 } else if (matches(*argv, "avpkt") == 0) {
  98                         NEXT_ARG();
  99                         if (get_size(&avpkt, *argv)) {
 100                                 explain1("avpkt");
 101                                 return -1;
 102                         }
 103                 } else if (matches(*argv, "mpu") == 0) {
 104                         NEXT_ARG();
 105                         if (get_size(&mpu, *argv)) {
 106                                 explain1("mpu");
 107                                 return -1;
 108                         }
 109                 } else if (matches(*argv, "allot") == 0) {
 110                         NEXT_ARG();
 111                         /* Accept and ignore "allot" for backward compatibility */
 112                         if (get_size(&allot, *argv)) {
 113                                 explain1("allot");
 114                                 return -1;
 115                         }
 116                 } else if (matches(*argv, "overhead") == 0) {
 117                         NEXT_ARG();
 118                         if (get_u16(&overhead, *argv, 10)) {
 119                                 explain1("overhead"); return -1;
 120                         }
 121                 } else if (matches(*argv, "linklayer") == 0) {
 122                         NEXT_ARG();
 123                         if (get_linklayer(&linklayer, *argv)) {
 124                                 explain1("linklayer"); return -1;
 125                         }
 126                 } else if (matches(*argv, "help") == 0) {
 127                         explain();
 128                         return -1;
 129                 } else {
 130                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 131                         explain();
 132                         return -1;
 133                 }
 134                 argc--; argv++;
 135         }
 136
 137         /* OK. All options are parsed. */
 138
 139         if (r.rate == 0) {
 140                 fprintf(stderr, "CBQ: bandwidth is required parameter.\n");
 141                 return -1;
 142         }
 143         if (avpkt == 0) {
 144                 fprintf(stderr, "CBQ: \"avpkt\" is required.\n");
 145                 return -1;
 146         }
 147         if (allot < (avpkt*3)/2)
 148                 allot = (avpkt*3)/2;
 149
 150         r.mpu = mpu;
 151         r.overhead = overhead;
 152         if (tc_calc_rtable(&r, rtab, cell_log, allot, linklayer) < 0) {
 153                 fprintf(stderr, "CBQ: failed to calculate rate table.\n");
 154                 return -1;
 155         }
 156
 157         if (ewma_log < 0)
 158                 ewma_log = TC_CBQ_DEF_EWMA;
 159         lss.ewma_log = ewma_log;
 160         lss.maxidle = tc_calc_xmittime(r.rate, avpkt);
 161         lss.change = TCF_CBQ_LSS_MAXIDLE|TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 162         lss.avpkt = avpkt;
 163
 164         tail = NLMSG_TAIL(n);
 165         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 166         addattr_l(n, 1024, TCA_CBQ_RATE, &r, sizeof(r));
 167         addattr_l(n, 1024, TCA_CBQ_LSSOPT, &lss, sizeof(lss));
 168         addattr_l(n, 3024, TCA_CBQ_RTAB, rtab, 1024);
 169         if (show_raw) {
 170                 int i;
 171
 172                 for (i = 0; i < 256; i++)
 173                         printf("%u ", rtab[i]);
 174                 printf("\n");
 175         }
 176         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 177         return 0;
 178 }
 179
 180 static int cbq_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 181 {
 182         int wrr_ok = 0, fopt_ok = 0;
 183         struct tc_ratespec r = {};
 184         struct tc_cbq_lssopt lss = {};
 185         struct tc_cbq_wrropt wrr = {};
 186         struct tc_cbq_fopt fopt = {};
 187         __u32 rtab[256];
 188         unsigned mpu = 0;
 189         int cell_log =  -1;
 190         int ewma_log =  -1;
 191         unsigned int bndw = 0;
 192         unsigned minburst = 0, maxburst = 0;
 193         unsigned short overhead = 0;
 194         unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
 195         struct rtattr *tail;
 196
 197         while (argc > 0) {
 198                 if (matches(*argv, "rate") == 0) {
 199                         NEXT_ARG();
 200                         if (get_rate(&r.rate, *argv)) {
 201                                 explain1("rate");
 202                                 return -1;
 203                         }
 204                 } else if (matches(*argv, "bandwidth") == 0) {
 205                         NEXT_ARG();
 206                         if (get_rate(&bndw, *argv)) {
 207                                 explain1("bandwidth");
 208                                 return -1;
 209                         }
 210                 } else if (matches(*argv, "minidle") == 0) {
 211                         NEXT_ARG();
 212                         if (get_u32(&lss.minidle, *argv, 0)) {
 213                                 explain1("minidle");
 214                                 return -1;
 215                         }
 216                         lss.change |= TCF_CBQ_LSS_MINIDLE;
 217                 } else if (matches(*argv, "minburst") == 0) {
 218                         NEXT_ARG();
 219                         if (get_u32(&minburst, *argv, 0)) {
 220                                 explain1("minburst");
 221                                 return -1;
 222                         }
 223                         lss.change |= TCF_CBQ_LSS_OFFTIME;
 224                 } else if (matches(*argv, "maxburst") == 0) {
 225                         NEXT_ARG();
 226                         if (get_u32(&maxburst, *argv, 0)) {
 227                                 explain1("maxburst");
 228                                 return -1;
 229                         }
 230                         lss.change |= TCF_CBQ_LSS_MAXIDLE;
 231                 } else if (matches(*argv, "bounded") == 0) {
 232                         lss.flags |= TCF_CBQ_LSS_BOUNDED;
 233                         lss.change |= TCF_CBQ_LSS_FLAGS;
 234                 } else if (matches(*argv, "borrow") == 0) {
 235                         lss.flags &= ~TCF_CBQ_LSS_BOUNDED;
 236                         lss.change |= TCF_CBQ_LSS_FLAGS;
 237                 } else if (matches(*argv, "isolated") == 0) {
 238                         lss.flags |= TCF_CBQ_LSS_ISOLATED;
 239                         lss.change |= TCF_CBQ_LSS_FLAGS;
 240                 } else if (matches(*argv, "sharing") == 0) {
 241                         lss.flags &= ~TCF_CBQ_LSS_ISOLATED;
 242                         lss.change |= TCF_CBQ_LSS_FLAGS;
 243                 } else if (matches(*argv, "ewma") == 0) {
 244                         NEXT_ARG();
 245                         if (get_integer(&ewma_log, *argv, 0)) {
 246                                 explain1("ewma");
 247                                 return -1;
 248                         }
 249                         if (ewma_log > 31) {
 250                                 fprintf(stderr, "ewma_log must be < 32\n");
 251                                 return -1;
 252                         }
 253                         lss.change |= TCF_CBQ_LSS_EWMA;
 254                 } else if (matches(*argv, "cell") == 0) {
 255                         unsigned int cell;
 256                         int i;
 257
 258                         NEXT_ARG();
 259                         if (get_size(&cell, *argv)) {
 260                                 explain1("cell");
 261                                 return -1;
 262                         }
 263                         for (i = 0; i < 32; i++)
 264                                 if ((1<<i) == cell)
 265                                         break;
 266                         if (i >= 32) {
 267                                 fprintf(stderr, "cell must be 2^n\n");
 268                                 return -1;
 269                         }
 270                         cell_log = i;
 271                 } else if (matches(*argv, "prio") == 0) {
 272                         unsigned int prio;
 273
 274                         NEXT_ARG();
 275                         if (get_u32(&prio, *argv, 0)) {
 276                                 explain1("prio");
 277                                 return -1;
 278                         }
 279                         if (prio > TC_CBQ_MAXPRIO) {
 280                                 fprintf(stderr, "\"prio\" must be number in the range 1...%d\n", TC_CBQ_MAXPRIO);
 281                                 return -1;
 282                         }
 283                         wrr.priority = prio;
 284                         wrr_ok++;
 285                 } else if (matches(*argv, "allot") == 0) {
 286                         NEXT_ARG();
 287                         if (get_size(&wrr.allot, *argv)) {
 288                                 explain1("allot");
 289                                 return -1;
 290                         }
 291                 } else if (matches(*argv, "avpkt") == 0) {
 292                         NEXT_ARG();
 293                         if (get_size(&lss.avpkt, *argv)) {
 294                                 explain1("avpkt");
 295                                 return -1;
 296                         }
 297                         lss.change |= TCF_CBQ_LSS_AVPKT;
 298                 } else if (matches(*argv, "mpu") == 0) {
 299                         NEXT_ARG();
 300                         if (get_size(&mpu, *argv)) {
 301                                 explain1("mpu");
 302                                 return -1;
 303                         }
 304                 } else if (matches(*argv, "weight") == 0) {
 305                         NEXT_ARG();
 306                         if (get_size(&wrr.weight, *argv)) {
 307                                 explain1("weight");
 308                                 return -1;
 309                         }
 310                         wrr_ok++;
 311                 } else if (matches(*argv, "split") == 0) {
 312                         NEXT_ARG();
 313                         if (get_tc_classid(&fopt.split, *argv)) {
 314                                 fprintf(stderr, "Invalid split node ID.\n");
 315                                 return -1;
 316                         }
 317                         fopt_ok++;
 318                 } else if (matches(*argv, "defmap") == 0) {
 319                         int err;
 320
 321                         NEXT_ARG();
 322                         err = sscanf(*argv, "%08x/%08x", &fopt.defmap, &fopt.defchange);
 323                         if (err < 1) {
 324                                 fprintf(stderr, "Invalid defmap, should be MASK32[/MASK]\n");
 325                                 return -1;
 326                         }
 327                         if (err == 1)
 328                                 fopt.defchange = ~0;
 329                         fopt_ok++;
 330                 } else if (matches(*argv, "overhead") == 0) {
 331                         NEXT_ARG();
 332                         if (get_u16(&overhead, *argv, 10)) {
 333                                 explain1("overhead"); return -1;
 334                         }
 335                 } else if (matches(*argv, "linklayer") == 0) {
 336                         NEXT_ARG();
 337                         if (get_linklayer(&linklayer, *argv)) {
 338                                 explain1("linklayer"); return -1;
 339                         }
 340                 } else if (matches(*argv, "help") == 0) {
 341                         explain_class();
 342                         return -1;
 343                 } else {
 344                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 345                         explain_class();
 346                         return -1;
 347                 }
 348                 argc--; argv++;
 349         }
 350
 351         /* OK. All options are parsed. */
 352
 353         /* 1. Prepare link sharing scheduler parameters */
 354         if (r.rate) {
 355                 unsigned int pktsize = wrr.allot;
 356
 357                 if (wrr.allot < (lss.avpkt*3)/2)
 358                         wrr.allot = (lss.avpkt*3)/2;
 359                 r.mpu = mpu;
 360                 r.overhead = overhead;
 361                 if (tc_calc_rtable(&r, rtab, cell_log, pktsize, linklayer) < 0) {
 362                         fprintf(stderr, "CBQ: failed to calculate rate table.\n");
 363                         return -1;
 364                 }
 365         }
 366         if (ewma_log < 0)
 367                 ewma_log = TC_CBQ_DEF_EWMA;
 368         lss.ewma_log = ewma_log;
 369         if (lss.change&(TCF_CBQ_LSS_OFFTIME|TCF_CBQ_LSS_MAXIDLE)) {
 370                 if (lss.avpkt == 0) {
 371                         fprintf(stderr, "CBQ: avpkt is required for max/minburst.\n");
 372                         return -1;
 373                 }
 374                 if (bndw == 0 || r.rate == 0) {
 375                         fprintf(stderr, "CBQ: bandwidth&rate are required for max/minburst.\n");
 376                         return -1;
 377                 }
 378         }
 379         if (wrr.priority == 0 && (n->nlmsg_flags&NLM_F_EXCL)) {
 380                 wrr_ok = 1;
 381                 wrr.priority = TC_CBQ_MAXPRIO;
 382                 if (wrr.allot == 0)
 383                         wrr.allot = (lss.avpkt*3)/2;
 384         }
 385         if (wrr_ok) {
 386                 if (wrr.weight == 0)
 387                         wrr.weight = (wrr.priority == TC_CBQ_MAXPRIO) ? 1 : r.rate;
 388                 if (wrr.allot == 0) {
 389                         fprintf(stderr, "CBQ: \"allot\" is required to set WRR parameters.\n");
 390                         return -1;
 391                 }
 392         }
 393         if (lss.change&TCF_CBQ_LSS_MAXIDLE) {
 394                 lss.maxidle = tc_cbq_calc_maxidle(bndw, r.rate, lss.avpkt, ewma_log, maxburst);
 395                 lss.change |= TCF_CBQ_LSS_MAXIDLE;
 396                 lss.change |= TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 397         }
 398         if (lss.change&TCF_CBQ_LSS_OFFTIME) {
 399                 lss.offtime = tc_cbq_calc_offtime(bndw, r.rate, lss.avpkt, ewma_log, minburst);
 400                 lss.change |= TCF_CBQ_LSS_OFFTIME;
 401                 lss.change |= TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
 402         }
 403         if (lss.change&TCF_CBQ_LSS_MINIDLE) {
 404                 lss.minidle <<= lss.ewma_log;
 405                 lss.change |= TCF_CBQ_LSS_EWMA;
 406         }
 407
 408         tail = NLMSG_TAIL(n);
 409         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 410         if (lss.change) {
 411                 lss.change |= TCF_CBQ_LSS_FLAGS;
 412                 addattr_l(n, 1024, TCA_CBQ_LSSOPT, &lss, sizeof(lss));
 413         }
 414         if (wrr_ok)
 415                 addattr_l(n, 1024, TCA_CBQ_WRROPT, &wrr, sizeof(wrr));
 416         if (fopt_ok)
 417                 addattr_l(n, 1024, TCA_CBQ_FOPT, &fopt, sizeof(fopt));
 418         if (r.rate) {
 419                 addattr_l(n, 1024, TCA_CBQ_RATE, &r, sizeof(r));
 420                 addattr_l(n, 3024, TCA_CBQ_RTAB, rtab, 1024);
 421                 if (show_raw) {
 422                         int i;
 423
 424                         for (i = 0; i < 256; i++)
 425                                 printf("%u ", rtab[i]);
 426                         printf("\n");
 427                 }
 428         }
 429         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 430         return 0;
 431 }
 432
 433
 434 static int cbq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 435 {
 436         struct rtattr *tb[TCA_CBQ_MAX+1];
 437         struct tc_ratespec *r = NULL;
 438         struct tc_cbq_lssopt *lss = NULL;
 439         struct tc_cbq_wrropt *wrr = NULL;
 440         struct tc_cbq_fopt *fopt = NULL;
 441         struct tc_cbq_ovl *ovl = NULL;
 442         unsigned int linklayer;
 443
 444         SPRINT_BUF(b1);
 445         SPRINT_BUF(b2);
 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 int) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
 480                                 (unsigned int) sizeof(*ovl));
 481                 else
 482                         ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
 483         }
 484
 485         if (r) {
 486                 char buf[64];
 487
 488                 print_rate(buf, sizeof(buf), r->rate);
 489                 fprintf(f, "rate %s ", buf);
 490                 linklayer = (r->linklayer & TC_LINKLAYER_MASK);
 491                 if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
 492                         fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b2));
 493                 if (show_details) {
 494                         fprintf(f, "cell %ub ", 1<<r->cell_log);
 495                         if (r->mpu)
 496                                 fprintf(f, "mpu %ub ", r->mpu);
 497                         if (r->overhead)
 498                                 fprintf(f, "overhead %ub ", r->overhead);
 499                 }
 500         }
 501         if (lss && lss->flags) {
 502                 int comma = 0;
 503
 504                 fprintf(f, "(");
 505                 if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
 506                         fprintf(f, "bounded");
 507                         comma = 1;
 508                 }
 509                 if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
 510                         if (comma)
 511                                 fprintf(f, ",");
 512                         fprintf(f, "isolated");
 513                 }
 514                 fprintf(f, ") ");
 515         }
 516         if (wrr) {
 517                 if (wrr->priority != TC_CBQ_MAXPRIO)
 518                         fprintf(f, "prio %u", wrr->priority);
 519                 else
 520                         fprintf(f, "prio no-transmit");
 521                 if (show_details) {
 522                         char buf[64];
 523
 524                         fprintf(f, "/%u ", wrr->cpriority);
 525                         if (wrr->weight != 1) {
 526                                 print_rate(buf, sizeof(buf), wrr->weight);
 527                                 fprintf(f, "weight %s ", buf);
 528                         }
 529                         if (wrr->allot)
 530                                 fprintf(f, "allot %ub ", wrr->allot);
 531                 }
 532         }
 533         if (lss && show_details) {
 534                 fprintf(f, "\nlevel %u ewma %u avpkt %ub ", lss->level, lss->ewma_log, lss->avpkt);
 535                 if (lss->maxidle) {
 536                         fprintf(f, "maxidle %s ", sprint_ticks(lss->maxidle>>lss->ewma_log, b1));
 537                         if (show_raw)
 538                                 fprintf(f, "[%08x] ", lss->maxidle);
 539                 }
 540                 if (lss->minidle != 0x7fffffff) {
 541                         fprintf(f, "minidle %s ", sprint_ticks(lss->minidle>>lss->ewma_log, b1));
 542                         if (show_raw)
 543                                 fprintf(f, "[%08x] ", lss->minidle);
 544                 }
 545                 if (lss->offtime) {
 546                         fprintf(f, "offtime %s ", sprint_ticks(lss->offtime, b1));
 547                         if (show_raw)
 548                                 fprintf(f, "[%08x] ", lss->offtime);
 549                 }
 550         }
 551         if (fopt && show_details) {
 552                 char buf[64];
 553
 554                 print_tc_classid(buf, sizeof(buf), fopt->split);
 555                 fprintf(f, "\nsplit %s ", buf);
 556                 if (fopt->defmap) {
 557                         fprintf(f, "defmap %08x", fopt->defmap);
 558                 }
 559         }
 560         return 0;
 561 }
 562
 563 static int cbq_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 564 {
 565         struct tc_cbq_xstats *st;
 566
 567         if (xstats == NULL)
 568                 return 0;
 569
 570         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 571                 return -1;
 572
 573         st = RTA_DATA(xstats);
 574         fprintf(f, "  borrowed %u overactions %u avgidle %g undertime %g", st->borrows,
 575                 st->overactions, (double)st->avgidle, (double)st->undertime);
 576         return 0;
 577 }
 578
 579 struct qdisc_util cbq_qdisc_util = {
 580         .id             = "cbq",
 581         .parse_qopt     = cbq_parse_opt,
 582         .print_qopt     = cbq_print_opt,
 583         .print_xstats   = cbq_print_xstats,
 584         .parse_copt     = cbq_parse_class_opt,
 585         .print_copt     = cbq_print_opt,
 586 };