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

   1 /*
   2  * q_tbf.c              TBF.
   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
  26 static void explain(void)
  27 {
  28         fprintf(stderr, "Usage: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu BYTES[/BYTES] ]\n");
  29         fprintf(stderr, "               [ peakrate KBPS ] [ latency TIME ]\n");
  30 }
  31
  32 static void explain1(char *arg)
  33 {
  34         fprintf(stderr, "Illegal \"%s\"\n", arg);
  35 }
  36
  37
  38 #define usage() return(-1)
  39
  40 static int tbf_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  41 {
  42         int ok=0;
  43         struct tc_tbf_qopt opt;
  44         __u32 rtab[256];
  45         __u32 ptab[256];
  46         unsigned buffer=0, mtu=0, latency=0;
  47         __u8 mpu=0;
  48         __s8 overhead=0;
  49         int atm=0;
  50         int Rcell_log=-1, Pcell_log = -1;
  51         struct rtattr *tail;
  52
  53         memset(&opt, 0, sizeof(opt));
  54
  55         while (argc > 0) {
  56                 if (matches(*argv, "limit") == 0) {
  57                         NEXT_ARG();
  58                         if (opt.limit || latency) {
  59                                 fprintf(stderr, "Double \"limit/latency\" spec\n");
  60                                 return -1;
  61                         }
  62                         if (get_size(&opt.limit, *argv)) {
  63                                 explain1("limit");
  64                                 return -1;
  65                         }
  66                         ok++;
  67                 } else if (matches(*argv, "latency") == 0) {
  68                         NEXT_ARG();
  69                         if (opt.limit || latency) {
  70                                 fprintf(stderr, "Double \"limit/latency\" spec\n");
  71                                 return -1;
  72                         }
  73                         if (get_usecs(&latency, *argv)) {
  74                                 explain1("latency");
  75                                 return -1;
  76                         }
  77                         ok++;
  78                 } else if (matches(*argv, "burst") == 0 ||
  79                         strcmp(*argv, "buffer") == 0 ||
  80                         strcmp(*argv, "maxburst") == 0) {
  81                         NEXT_ARG();
  82                         if (buffer) {
  83                                 fprintf(stderr, "Double \"buffer/burst\" spec\n");
  84                                 return -1;
  85                         }
  86                         if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
  87                                 explain1("buffer");
  88                                 return -1;
  89                         }
  90                         ok++;
  91                 } else if (strcmp(*argv, "mtu") == 0 ||
  92                            strcmp(*argv, "minburst") == 0) {
  93                         NEXT_ARG();
  94                         if (mtu) {
  95                                 fprintf(stderr, "Double \"mtu/minburst\" spec\n");
  96                                 return -1;
  97                         }
  98                         if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
  99                                 explain1("mtu");
 100                                 return -1;
 101                         }
 102                         ok++;
 103                 } else if (strcmp(*argv, "mpu") == 0) {
 104                         NEXT_ARG();
 105                         if (mpu) {
 106                                 fprintf(stderr, "Double \"mpu\" spec\n");
 107                                 return -1;
 108                         }
 109                         if (get_u8(&mpu, *argv, 10)) {
 110                                 explain1("mpu");
 111                                 return -1;
 112                         }
 113                         ok++;
 114                 } else if (strcmp(*argv, "rate") == 0) {
 115                         NEXT_ARG();
 116                         if (opt.rate.rate) {
 117                                 fprintf(stderr, "Double \"rate\" spec\n");
 118                                 return -1;
 119                         }
 120                         if (get_rate(&opt.rate.rate, *argv)) {
 121                                 explain1("rate");
 122                                 return -1;
 123                         }
 124                         ok++;
 125                 } else if (strcmp(*argv, "overhead") == 0) {
 126                         NEXT_ARG();
 127                         if (overhead) {
 128                                 fprintf(stderr, "Double \"overhead\" spec\n");
 129                                 return -1;
 130                         }
 131                         if (get_s8(&overhead, *argv, 10)) {
 132                                 explain1("overhead");
 133                                 return -1;
 134                         }
 135                         ok++;
 136                 } else if (strcmp(*argv, "atm") == 0) {
 137                         atm = 1;
 138                         ok++;
 139                 } else if (matches(*argv, "peakrate") == 0) {
 140                         NEXT_ARG();
 141                         if (opt.peakrate.rate) {
 142                                 fprintf(stderr, "Double \"peakrate\" spec\n");
 143                                 return -1;
 144                         }
 145                         if (get_rate(&opt.peakrate.rate, *argv)) {
 146                                 explain1("peakrate");
 147                                 return -1;
 148                         }
 149                         ok++;
 150                 } else if (strcmp(*argv, "help") == 0) {
 151                         explain();
 152                         return -1;
 153                 } else {
 154                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 155                         explain();
 156                         return -1;
 157                 }
 158                 argc--; argv++;
 159         }
 160
 161         if (!ok)
 162                 return 0;
 163
 164         if (opt.rate.rate == 0 || !buffer) {
 165                 fprintf(stderr, "Both \"rate\" and \"burst\" are required.\n");
 166                 return -1;
 167         }
 168         if (opt.peakrate.rate) {
 169                 if (!mtu) {
 170                         fprintf(stderr, "\"mtu\" is required, if \"peakrate\" is requested.\n");
 171                         return -1;
 172                 }
 173         }
 174
 175         if (opt.limit == 0 && latency == 0) {
 176                 fprintf(stderr, "Either \"limit\" or \"latency\" are required.\n");
 177                 return -1;
 178         }
 179
 180         if (opt.limit == 0) {
 181                 double lim = opt.rate.rate*(double)latency/1000000 + buffer;
 182                 if (opt.peakrate.rate) {
 183                         double lim2 = opt.peakrate.rate*(double)latency/1000000 + mtu;
 184                         if (lim2 < lim)
 185                                 lim = lim2;
 186                 }
 187                 opt.limit = lim;
 188         }
 189
 190         tc_calc_ratespec(&opt.rate, rtab, opt.rate.rate, Rcell_log, mtu, mpu, atm, overhead);
 191         opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
 192         if (opt.peakrate.rate) {
 193                 tc_calc_ratespec(&opt.peakrate, ptab, opt.peakrate.rate, Pcell_log, mtu, mpu, atm, overhead);
 194                 opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
 195         }
 196
 197         tail = NLMSG_TAIL(n);
 198         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 199         addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
 200         addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
 201         if (opt.peakrate.rate)
 202                 addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
 203         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 204         return 0;
 205 }
 206
 207 static int tbf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 208 {
 209         struct rtattr *tb[TCA_TBF_PTAB+1];
 210         struct tc_tbf_qopt *qopt;
 211         double buffer, mtu;
 212         double latency;
 213         SPRINT_BUF(b1);
 214         SPRINT_BUF(b2);
 215
 216         if (opt == NULL)
 217                 return 0;
 218
 219         parse_rtattr_nested(tb, TCA_TBF_PTAB, opt);
 220
 221         if (tb[TCA_TBF_PARMS] == NULL)
 222                 return -1;
 223
 224         qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
 225         if (RTA_PAYLOAD(tb[TCA_TBF_PARMS])  < sizeof(*qopt))
 226                 return -1;
 227         fprintf(f, "rate %s ", sprint_rate(qopt->rate.rate, b1));
 228         buffer = ((double)qopt->rate.rate*tc_core_tick2usec(qopt->buffer))/1000000;
 229         if (show_details) {
 230                 fprintf(f, "burst %s/%u mpu %s overhead %d ", sprint_size(buffer, b1),
 231                         1<<qopt->rate.cell_log,
 232                         sprint_size(qopt->rate.mpu & 0xFF, b2),
 233                         (__s8)(qopt->rate.mpu >> 8));
 234                 if (qopt->rate.feature & 0x0001)
 235                         fprintf(f, "atm ");
 236         } else {
 237                 fprintf(f, "burst %s ", sprint_size(buffer, b1));
 238         }
 239         if (show_raw)
 240                 fprintf(f, "[%08x] ", qopt->buffer);
 241         if (qopt->peakrate.rate) {
 242                 fprintf(f, "peakrate %s ", sprint_rate(qopt->peakrate.rate, b1));
 243                 if (qopt->mtu || qopt->peakrate.mpu) {
 244                         mtu = ((double)qopt->peakrate.rate*tc_core_tick2usec(qopt->mtu))/1000000;
 245                         if (show_details) {
 246                                 fprintf(f, "mtu %s/%u mpu %s overhead %d ", sprint_size(mtu, b1),
 247                                         1<<qopt->peakrate.cell_log,
 248                                         sprint_size(qopt->peakrate.mpu & 0xFF, b2),
 249                                         (__s8)(qopt->peakrate.mpu >> 8));
 250                                 if (qopt->peakrate.feature & 0x0001)
 251                                         fprintf(f, "atm ");
 252                         } else {
 253                                 fprintf(f, "minburst %s ", sprint_size(mtu, b1));
 254                         }
 255                         if (show_raw)
 256                                 fprintf(f, "[%08x] ", qopt->mtu);
 257                 }
 258         }
 259
 260         if (show_raw)
 261                 fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));
 262
 263         latency = 1000000*(qopt->limit/(double)qopt->rate.rate) - tc_core_tick2usec(qopt->buffer);
 264         if (qopt->peakrate.rate) {
 265                 double lat2 = 1000000*(qopt->limit/(double)qopt->peakrate.rate) - tc_core_tick2usec(qopt->mtu);
 266                 if (lat2 > latency)
 267                         latency = lat2;
 268         }
 269         fprintf(f, "lat %s ", sprint_usecs(tc_core_tick2usec(latency), b1));
 270
 271         return 0;
 272 }
 273
 274 struct qdisc_util tbf_qdisc_util = {
 275         .id             = "tbf",
 276         .parse_qopt     = tbf_parse_opt,
 277         .print_qopt     = tbf_print_opt,
 278 };
 279