tc/q_htb.c

   1 /*
   2  * q_htb.c              HTB.
   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:     Martin Devera, devik@cdi.cz
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21
  22 #include "utils.h"
  23 #include "tc_util.h"
  24
  25 #define HTB_TC_VER 0x30003
  26 #if HTB_TC_VER >> 16 != TC_HTB_PROTOVER
  27 #error "Different kernel and TC HTB versions"
  28 #endif
  29
  30 static void explain(void)
  31 {
  32         fprintf(stderr, "Usage: ... qdisc add ... htb [default N] [r2q N]\n"
  33                 "                      [direct_qlen P]\n"
  34                 " default  minor id of class to which unclassified packets are sent {0}\n"
  35                 " r2q      DRR quantums are computed as rate in Bps/r2q {10}\n"
  36                 " debug    string of 16 numbers each 0-3 {0}\n\n"
  37                 " direct_qlen  Limit of the direct queue {in packets}\n"
  38                 "... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]\n"
  39                 "                      [prio P] [slot S] [pslot PS]\n"
  40                 "                      [ceil R2] [cburst B2] [mtu MTU] [quantum Q]\n"
  41                 " rate     rate allocated to this class (class can still borrow)\n"
  42                 " burst    max bytes burst which can be accumulated during idle period {computed}\n"
  43                 " mpu      minimum packet size used in rate computations\n"
  44                 " overhead per-packet size overhead used in rate computations\n"
  45                 " linklay  adapting to a linklayer e.g. atm\n"
  46                 " ceil     definite upper class rate (no borrows) {rate}\n"
  47                 " cburst   burst but for ceil {computed}\n"
  48                 " mtu      max packet size we create rate map for {1600}\n"
  49                 " prio     priority of leaf; lower are served first {0}\n"
  50                 " quantum  how much bytes to serve from leaf at once {use r2q}\n"
  51                 "\nTC HTB version %d.%d\n", HTB_TC_VER>>16, HTB_TC_VER&0xffff
  52                 );
  53 }
  54
  55 static void explain1(char *arg)
  56 {
  57     fprintf(stderr, "Illegal \"%s\"\n", arg);
  58     explain();
  59 }
  60
  61
  62 static int htb_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  63 {
  64         unsigned int direct_qlen = ~0U;
  65         struct tc_htb_glob opt = {
  66                 .rate2quantum = 10,
  67                 .version = 3,
  68         };
  69         struct rtattr *tail;
  70         unsigned int i; char *p;
  71
  72         while (argc > 0) {
  73                 if (matches(*argv, "r2q") == 0) {
  74                         NEXT_ARG();
  75                         if (get_u32(&opt.rate2quantum, *argv, 10)) {
  76                                 explain1("r2q"); return -1;
  77                         }
  78                 } else if (matches(*argv, "default") == 0) {
  79                         NEXT_ARG();
  80                         if (get_u32(&opt.defcls, *argv, 16)) {
  81                                 explain1("default"); return -1;
  82                         }
  83                 } else if (matches(*argv, "debug") == 0) {
  84                         NEXT_ARG(); p = *argv;
  85                         for (i = 0; i < 16; i++, p++) {
  86                                 if (*p < '0' || *p > '3') break;
  87                                 opt.debug |= (*p-'0')<<(2*i);
  88                         }
  89                 } else if (matches(*argv, "direct_qlen") == 0) {
  90                         NEXT_ARG();
  91                         if (get_u32(&direct_qlen, *argv, 10)) {
  92                                 explain1("direct_qlen"); return -1;
  93                         }
  94                 } else {
  95                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  96                         explain();
  97                         return -1;
  98                 }
  99                 argc--; argv++;
 100         }
 101         tail = NLMSG_TAIL(n);
 102         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 103         addattr_l(n, 2024, TCA_HTB_INIT, &opt, NLMSG_ALIGN(sizeof(opt)));
 104         if (direct_qlen != ~0U)
 105                 addattr_l(n, 2024, TCA_HTB_DIRECT_QLEN,
 106                           &direct_qlen, sizeof(direct_qlen));
 107         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 108         return 0;
 109 }
 110
 111 static int htb_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 112 {
 113         int ok = 0;
 114         struct tc_htb_opt opt = {};
 115         __u32 rtab[256], ctab[256];
 116         unsigned buffer = 0, cbuffer = 0;
 117         int cell_log =  -1, ccell_log = -1;
 118         unsigned int mtu = 1600; /* eth packet len */
 119         unsigned short mpu = 0;
 120         unsigned short overhead = 0;
 121         unsigned int linklayer  = LINKLAYER_ETHERNET; /* Assume ethernet */
 122         struct rtattr *tail;
 123         __u64 ceil64 = 0, rate64 = 0;
 124
 125         while (argc > 0) {
 126                 if (matches(*argv, "prio") == 0) {
 127                         NEXT_ARG();
 128                         if (get_u32(&opt.prio, *argv, 10)) {
 129                                 explain1("prio"); return -1;
 130                         }
 131                         ok++;
 132                 } else if (matches(*argv, "mtu") == 0) {
 133                         NEXT_ARG();
 134                         if (get_u32(&mtu, *argv, 10)) {
 135                                 explain1("mtu"); return -1;
 136                         }
 137                 } else if (matches(*argv, "mpu") == 0) {
 138                         NEXT_ARG();
 139                         if (get_u16(&mpu, *argv, 10)) {
 140                                 explain1("mpu"); return -1;
 141                         }
 142                 } else if (matches(*argv, "overhead") == 0) {
 143                         NEXT_ARG();
 144                         if (get_u16(&overhead, *argv, 10)) {
 145                                 explain1("overhead"); return -1;
 146                         }
 147                 } else if (matches(*argv, "linklayer") == 0) {
 148                         NEXT_ARG();
 149                         if (get_linklayer(&linklayer, *argv)) {
 150                                 explain1("linklayer"); return -1;
 151                         }
 152                 } else if (matches(*argv, "quantum") == 0) {
 153                         NEXT_ARG();
 154                         if (get_u32(&opt.quantum, *argv, 10)) {
 155                                 explain1("quantum"); return -1;
 156                         }
 157                 } else if (matches(*argv, "burst") == 0 ||
 158                            strcmp(*argv, "buffer") == 0 ||
 159                            strcmp(*argv, "maxburst") == 0) {
 160                         NEXT_ARG();
 161                         if (get_size_and_cell(&buffer, &cell_log, *argv) < 0) {
 162                                 explain1("buffer");
 163                                 return -1;
 164                         }
 165                         ok++;
 166                 } else if (matches(*argv, "cburst") == 0 ||
 167                            strcmp(*argv, "cbuffer") == 0 ||
 168                            strcmp(*argv, "cmaxburst") == 0) {
 169                         NEXT_ARG();
 170                         if (get_size_and_cell(&cbuffer, &ccell_log, *argv) < 0) {
 171                                 explain1("cbuffer");
 172                                 return -1;
 173                         }
 174                         ok++;
 175                 } else if (strcmp(*argv, "ceil") == 0) {
 176                         NEXT_ARG();
 177                         if (ceil64) {
 178                                 fprintf(stderr, "Double \"ceil\" spec\n");
 179                                 return -1;
 180                         }
 181                         if (get_rate64(&ceil64, *argv)) {
 182                                 explain1("ceil");
 183                                 return -1;
 184                         }
 185                         ok++;
 186                 } else if (strcmp(*argv, "rate") == 0) {
 187                         NEXT_ARG();
 188                         if (rate64) {
 189                                 fprintf(stderr, "Double \"rate\" spec\n");
 190                                 return -1;
 191                         }
 192                         if (get_rate64(&rate64, *argv)) {
 193                                 explain1("rate");
 194                                 return -1;
 195                         }
 196                         ok++;
 197                 } else if (strcmp(*argv, "help") == 0) {
 198                         explain();
 199                         return -1;
 200                 } else {
 201                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 202                         explain();
 203                         return -1;
 204                 }
 205                 argc--; argv++;
 206         }
 207
 208         /*      if (!ok)
 209                 return 0;*/
 210
 211         if (!rate64) {
 212                 fprintf(stderr, "\"rate\" is required.\n");
 213                 return -1;
 214         }
 215         /* if ceil params are missing, use the same as rate */
 216         if (!ceil64)
 217                 ceil64 = rate64;
 218
 219         opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64;
 220         opt.ceil.rate = (ceil64 >= (1ULL << 32)) ? ~0U : ceil64;
 221
 222         /* compute minimal allowed burst from rate; mtu is added here to make
 223            sute that buffer is larger than mtu and to have some safeguard space */
 224         if (!buffer)
 225                 buffer = rate64 / get_hz() + mtu;
 226         if (!cbuffer)
 227                 cbuffer = ceil64 / get_hz() + mtu;
 228
 229         opt.ceil.overhead = overhead;
 230         opt.rate.overhead = overhead;
 231
 232         opt.ceil.mpu = mpu;
 233         opt.rate.mpu = mpu;
 234
 235         if (tc_calc_rtable(&opt.rate, rtab, cell_log, mtu, linklayer) < 0) {
 236                 fprintf(stderr, "htb: failed to calculate rate table.\n");
 237                 return -1;
 238         }
 239         opt.buffer = tc_calc_xmittime(rate64, buffer);
 240
 241         if (tc_calc_rtable(&opt.ceil, ctab, ccell_log, mtu, linklayer) < 0) {
 242                 fprintf(stderr, "htb: failed to calculate ceil rate table.\n");
 243                 return -1;
 244         }
 245         opt.cbuffer = tc_calc_xmittime(ceil64, cbuffer);
 246
 247         tail = NLMSG_TAIL(n);
 248         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 249
 250         if (rate64 >= (1ULL << 32))
 251                 addattr_l(n, 1124, TCA_HTB_RATE64, &rate64, sizeof(rate64));
 252
 253         if (ceil64 >= (1ULL << 32))
 254                 addattr_l(n, 1224, TCA_HTB_CEIL64, &ceil64, sizeof(ceil64));
 255
 256         addattr_l(n, 2024, TCA_HTB_PARMS, &opt, sizeof(opt));
 257         addattr_l(n, 3024, TCA_HTB_RTAB, rtab, 1024);
 258         addattr_l(n, 4024, TCA_HTB_CTAB, ctab, 1024);
 259         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 260         return 0;
 261 }
 262
 263 static int htb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 264 {
 265         struct rtattr *tb[TCA_HTB_MAX + 1];
 266         struct tc_htb_opt *hopt;
 267         struct tc_htb_glob *gopt;
 268         double buffer, cbuffer;
 269         unsigned int linklayer;
 270         __u64 rate64, ceil64;
 271
 272         SPRINT_BUF(b1);
 273         SPRINT_BUF(b2);
 274         SPRINT_BUF(b3);
 275
 276         if (opt == NULL)
 277                 return 0;
 278
 279         parse_rtattr_nested(tb, TCA_HTB_MAX, opt);
 280
 281         if (tb[TCA_HTB_PARMS]) {
 282                 hopt = RTA_DATA(tb[TCA_HTB_PARMS]);
 283                 if (RTA_PAYLOAD(tb[TCA_HTB_PARMS])  < sizeof(*hopt)) return -1;
 284
 285                 if (!hopt->level) {
 286                         fprintf(f, "prio %d ", (int)hopt->prio);
 287                         if (show_details)
 288                                 fprintf(f, "quantum %d ", (int)hopt->quantum);
 289                 }
 290
 291                 rate64 = hopt->rate.rate;
 292                 if (tb[TCA_HTB_RATE64] &&
 293                     RTA_PAYLOAD(tb[TCA_HTB_RATE64]) >= sizeof(rate64)) {
 294                         rate64 = rta_getattr_u64(tb[TCA_HTB_RATE64]);
 295                 }
 296
 297                 ceil64 = hopt->ceil.rate;
 298                 if (tb[TCA_HTB_CEIL64] &&
 299                     RTA_PAYLOAD(tb[TCA_HTB_CEIL64]) >= sizeof(ceil64))
 300                         ceil64 = rta_getattr_u64(tb[TCA_HTB_CEIL64]);
 301
 302                 fprintf(f, "rate %s ", sprint_rate(rate64, b1));
 303                 if (hopt->rate.overhead)
 304                         fprintf(f, "overhead %u ", hopt->rate.overhead);
 305                 buffer = tc_calc_xmitsize(rate64, hopt->buffer);
 306
 307                 fprintf(f, "ceil %s ", sprint_rate(ceil64, b1));
 308                 cbuffer = tc_calc_xmitsize(ceil64, hopt->cbuffer);
 309                 linklayer = (hopt->rate.linklayer & TC_LINKLAYER_MASK);
 310                 if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
 311                         fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b3));
 312                 if (show_details) {
 313                         fprintf(f, "burst %s/%u mpu %s ",
 314                                 sprint_size(buffer, b1),
 315                                 1<<hopt->rate.cell_log,
 316                                 sprint_size(hopt->rate.mpu, b2));
 317                         fprintf(f, "cburst %s/%u mpu %s ",
 318                                 sprint_size(cbuffer, b1),
 319                                 1<<hopt->ceil.cell_log,
 320                                 sprint_size(hopt->ceil.mpu, b2));
 321                         fprintf(f, "level %d ", (int)hopt->level);
 322                 } else {
 323                         fprintf(f, "burst %s ", sprint_size(buffer, b1));
 324                         fprintf(f, "cburst %s ", sprint_size(cbuffer, b1));
 325                 }
 326                 if (show_raw)
 327                         fprintf(f, "buffer [%08x] cbuffer [%08x] ",
 328                                 hopt->buffer, hopt->cbuffer);
 329         }
 330         if (tb[TCA_HTB_INIT]) {
 331                 gopt = RTA_DATA(tb[TCA_HTB_INIT]);
 332                 if (RTA_PAYLOAD(tb[TCA_HTB_INIT])  < sizeof(*gopt)) return -1;
 333
 334                 fprintf(f, "r2q %d default %x direct_packets_stat %u",
 335                         gopt->rate2quantum, gopt->defcls, gopt->direct_pkts);
 336                 if (show_details)
 337                         fprintf(f, " ver %d.%d", gopt->version >> 16, gopt->version & 0xffff);
 338         }
 339         if (tb[TCA_HTB_DIRECT_QLEN] &&
 340             RTA_PAYLOAD(tb[TCA_HTB_DIRECT_QLEN]) >= sizeof(__u32)) {
 341                 __u32 direct_qlen = rta_getattr_u32(tb[TCA_HTB_DIRECT_QLEN]);
 342
 343                 fprintf(f, " direct_qlen %u", direct_qlen);
 344         }
 345         return 0;
 346 }
 347
 348 static int htb_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 349 {
 350         struct tc_htb_xstats *st;
 351
 352         if (xstats == NULL)
 353                 return 0;
 354
 355         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 356                 return -1;
 357
 358         st = RTA_DATA(xstats);
 359         fprintf(f, " lended: %u borrowed: %u giants: %u\n",
 360                 st->lends, st->borrows, st->giants);
 361         fprintf(f, " tokens: %d ctokens: %d\n", st->tokens, st->ctokens);
 362         return 0;
 363 }
 364
 365 struct qdisc_util htb_qdisc_util = {
 366         .id             = "htb",
 367         .parse_qopt     = htb_parse_opt,
 368         .print_qopt     = htb_print_opt,
 369         .print_xstats   = htb_print_xstats,
 370         .parse_copt     = htb_parse_class_opt,
 371         .print_copt     = htb_print_opt,
 372 };