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 static int htb_parse_opt(struct qdisc_util *qu, int argc,
  62                          char **argv, struct nlmsghdr *n, const char *dev)
  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 = addattr_nest(n, 1024, TCA_OPTIONS);
 102         addattr_l(n, 2024, TCA_HTB_INIT, &opt, NLMSG_ALIGN(sizeof(opt)));
 103         if (direct_qlen != ~0U)
 104                 addattr_l(n, 2024, TCA_HTB_DIRECT_QLEN,
 105                           &direct_qlen, sizeof(direct_qlen));
 106         addattr_nest_end(n, tail);
 107         return 0;
 108 }
 109
 110 static int htb_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
 111 {
 112         struct tc_htb_opt opt = {};
 113         __u32 rtab[256], ctab[256];
 114         unsigned buffer = 0, cbuffer = 0;
 115         int cell_log =  -1, ccell_log = -1;
 116         unsigned int mtu = 1600; /* eth packet len */
 117         unsigned short mpu = 0;
 118         unsigned short overhead = 0;
 119         unsigned int linklayer  = LINKLAYER_ETHERNET; /* Assume ethernet */
 120         struct rtattr *tail;
 121         __u64 ceil64 = 0, rate64 = 0;
 122
 123         while (argc > 0) {
 124                 if (matches(*argv, "prio") == 0) {
 125                         NEXT_ARG();
 126                         if (get_u32(&opt.prio, *argv, 10)) {
 127                                 explain1("prio"); return -1;
 128                         }
 129                 } else if (matches(*argv, "mtu") == 0) {
 130                         NEXT_ARG();
 131                         if (get_u32(&mtu, *argv, 10)) {
 132                                 explain1("mtu"); return -1;
 133                         }
 134                 } else if (matches(*argv, "mpu") == 0) {
 135                         NEXT_ARG();
 136                         if (get_u16(&mpu, *argv, 10)) {
 137                                 explain1("mpu"); return -1;
 138                         }
 139                 } else if (matches(*argv, "overhead") == 0) {
 140                         NEXT_ARG();
 141                         if (get_u16(&overhead, *argv, 10)) {
 142                                 explain1("overhead"); return -1;
 143                         }
 144                 } else if (matches(*argv, "linklayer") == 0) {
 145                         NEXT_ARG();
 146                         if (get_linklayer(&linklayer, *argv)) {
 147                                 explain1("linklayer"); return -1;
 148                         }
 149                 } else if (matches(*argv, "quantum") == 0) {
 150                         NEXT_ARG();
 151                         if (get_u32(&opt.quantum, *argv, 10)) {
 152                                 explain1("quantum"); return -1;
 153                         }
 154                 } else if (matches(*argv, "burst") == 0 ||
 155                            strcmp(*argv, "buffer") == 0 ||
 156                            strcmp(*argv, "maxburst") == 0) {
 157                         NEXT_ARG();
 158                         if (get_size_and_cell(&buffer, &cell_log, *argv) < 0) {
 159                                 explain1("buffer");
 160                                 return -1;
 161                         }
 162                 } else if (matches(*argv, "cburst") == 0 ||
 163                            strcmp(*argv, "cbuffer") == 0 ||
 164                            strcmp(*argv, "cmaxburst") == 0) {
 165                         NEXT_ARG();
 166                         if (get_size_and_cell(&cbuffer, &ccell_log, *argv) < 0) {
 167                                 explain1("cbuffer");
 168                                 return -1;
 169                         }
 170                 } else if (strcmp(*argv, "ceil") == 0) {
 171                         NEXT_ARG();
 172                         if (ceil64) {
 173                                 fprintf(stderr, "Double \"ceil\" spec\n");
 174                                 return -1;
 175                         }
 176                         if (strchr(*argv, '%')) {
 177                                 if (get_percent_rate64(&ceil64, *argv, dev)) {
 178                                         explain1("ceil");
 179                                         return -1;
 180                                 }
 181                         } else if (get_rate64(&ceil64, *argv)) {
 182                                 explain1("ceil");
 183                                 return -1;
 184                         }
 185                 } else if (strcmp(*argv, "rate") == 0) {
 186                         NEXT_ARG();
 187                         if (rate64) {
 188                                 fprintf(stderr, "Double \"rate\" spec\n");
 189                                 return -1;
 190                         }
 191                         if (strchr(*argv, '%')) {
 192                                 if (get_percent_rate64(&rate64, *argv, dev)) {
 193                                         explain1("rate");
 194                                         return -1;
 195                                 }
 196                         } else if (get_rate64(&rate64, *argv)) {
 197                                 explain1("rate");
 198                                 return -1;
 199                         }
 200                 } else if (strcmp(*argv, "help") == 0) {
 201                         explain();
 202                         return -1;
 203                 } else {
 204                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 205                         explain();
 206                         return -1;
 207                 }
 208                 argc--; argv++;
 209         }
 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 = addattr_nest(n, 1024, TCA_OPTIONS);
 248
 249         if (rate64 >= (1ULL << 32))
 250                 addattr_l(n, 1124, TCA_HTB_RATE64, &rate64, sizeof(rate64));
 251
 252         if (ceil64 >= (1ULL << 32))
 253                 addattr_l(n, 1224, TCA_HTB_CEIL64, &ceil64, sizeof(ceil64));
 254
 255         addattr_l(n, 2024, TCA_HTB_PARMS, &opt, sizeof(opt));
 256         addattr_l(n, 3024, TCA_HTB_RTAB, rtab, 1024);
 257         addattr_l(n, 4024, TCA_HTB_CTAB, ctab, 1024);
 258         addattr_nest_end(n, tail);
 259         return 0;
 260 }
 261
 262 static int htb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 263 {
 264         struct rtattr *tb[TCA_HTB_MAX + 1];
 265         struct tc_htb_opt *hopt;
 266         struct tc_htb_glob *gopt;
 267         double buffer, cbuffer;
 268         unsigned int linklayer;
 269         __u64 rate64, ceil64;
 270
 271         SPRINT_BUF(b1);
 272         SPRINT_BUF(b2);
 273         SPRINT_BUF(b3);
 274
 275         if (opt == NULL)
 276                 return 0;
 277
 278         parse_rtattr_nested(tb, TCA_HTB_MAX, opt);
 279
 280         if (tb[TCA_HTB_PARMS]) {
 281                 hopt = RTA_DATA(tb[TCA_HTB_PARMS]);
 282                 if (RTA_PAYLOAD(tb[TCA_HTB_PARMS])  < sizeof(*hopt)) return -1;
 283
 284                 if (!hopt->level) {
 285                         print_int(PRINT_ANY, "prio", "prio %d ", (int)hopt->prio);
 286                         if (show_details)
 287                                 print_int(PRINT_ANY, "quantum", "quantum %d ",
 288                                           (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                 print_int(PRINT_ANY, "r2q", "r2q %d", gopt->rate2quantum);
 335                 print_0xhex(PRINT_ANY, "default", " default %#llx", gopt->defcls);
 336                 print_uint(PRINT_ANY, "direct_packets_stat",
 337                            " direct_packets_stat %u", gopt->direct_pkts);
 338                 if (show_details) {
 339                         sprintf(b1, "%d.%d", gopt->version >> 16, gopt->version & 0xffff);
 340                         print_string(PRINT_ANY, "ver", " ver %s", b1);
 341                 }
 342         }
 343         if (tb[TCA_HTB_DIRECT_QLEN] &&
 344             RTA_PAYLOAD(tb[TCA_HTB_DIRECT_QLEN]) >= sizeof(__u32)) {
 345                 __u32 direct_qlen = rta_getattr_u32(tb[TCA_HTB_DIRECT_QLEN]);
 346
 347                 print_uint(PRINT_ANY, "direct_qlen", " direct_qlen %u",
 348                            direct_qlen);
 349         }
 350         return 0;
 351 }
 352
 353 static int htb_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
 354 {
 355         struct tc_htb_xstats *st;
 356
 357         if (xstats == NULL)
 358                 return 0;
 359
 360         if (RTA_PAYLOAD(xstats) < sizeof(*st))
 361                 return -1;
 362
 363         st = RTA_DATA(xstats);
 364         fprintf(f, " lended: %u borrowed: %u giants: %u\n",
 365                 st->lends, st->borrows, st->giants);
 366         fprintf(f, " tokens: %d ctokens: %d\n", st->tokens, st->ctokens);
 367         return 0;
 368 }
 369
 370 struct qdisc_util htb_qdisc_util = {
 371         .id             = "htb",
 372         .parse_qopt     = htb_parse_opt,
 373         .print_qopt     = htb_print_opt,
 374         .print_xstats   = htb_print_xstats,
 375         .parse_copt     = htb_parse_class_opt,
 376         .print_copt     = htb_print_opt,
 377 };