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