tc/q_gred.c

   1 /*
   2  * q_gred.c             GRED.
   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:    J Hadi Salim(hadi@nortelnetworks.com)
  10  *             code ruthlessly ripped from
  11  *             Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  12  *
  13  */
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <syslog.h>
  19 #include <fcntl.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <arpa/inet.h>
  23 #include <string.h>
  24
  25 #include "utils.h"
  26 #include "tc_util.h"
  27
  28 #include "tc_red.h"
  29
  30
  31 #if 0
  32 #define DPRINTF(format,args...) fprintf(stderr,format,##args)
  33 #else
  34 #define DPRINTF(format,args...)
  35 #endif
  36
  37 static void explain(void)
  38 {
  39         fprintf(stderr, "Usage: ... gred DP drop-probability limit BYTES "
  40             "min BYTES max BYTES\n");
  41         fprintf(stderr, "    avpkt BYTES burst PACKETS probability PROBABILITY "
  42             "bandwidth KBPS\n");
  43         fprintf(stderr, "    [prio value]\n");
  44         fprintf(stderr," OR ...\n");
  45         fprintf(stderr," gred setup DPs <num of DPs> default <default DP> "
  46             "[grio]\n");
  47 }
  48
  49 static int init_gred(struct qdisc_util *qu, int argc, char **argv,
  50                      struct nlmsghdr *n)
  51 {
  52
  53         struct rtattr *tail;
  54         struct tc_gred_sopt opt;
  55         int dps = 0;
  56         int def_dp = -1;
  57
  58         while (argc > 0) {
  59                 DPRINTF(stderr,"init_gred: invoked with %s\n",*argv);
  60                 if (strcmp(*argv, "DPs") == 0) {
  61                         NEXT_ARG();
  62                         DPRINTF(stderr,"init_gred: next_arg with %s\n",*argv);
  63                         dps = strtol(*argv, (char **)NULL, 10);
  64                         if (dps < 0 || dps >MAX_DPs) {
  65                                 fprintf(stderr, "DPs =%d\n", dps);
  66                                 fprintf(stderr, "Illegal \"DPs\"\n");
  67                                 fprintf(stderr, "GRED: only %d DPs are "
  68                                         "currently supported\n",MAX_DPs);
  69                                 return -1;
  70                         }
  71                 } else if (strcmp(*argv, "default") == 0) {
  72                         NEXT_ARG();
  73                         def_dp = strtol(*argv, (char **)NULL, 10);
  74                         if (dps == 0) {
  75                                 fprintf(stderr, "\"default DP\" must be "
  76                                         "defined after DPs\n");
  77                                 return -1;
  78                         }
  79                         if (def_dp < 0 || def_dp > dps) {
  80                                 fprintf(stderr,
  81                                         "\"default DP\" must be less than %d\n",
  82                                         opt.DPs);
  83                                 return -1;
  84                         }
  85                 } else if (strcmp(*argv, "grio") == 0) {
  86                         opt.grio=1;
  87                 } else if (strcmp(*argv, "help") == 0) {
  88                         explain();
  89                         return -1;
  90                 } else {
  91                         fprintf(stderr, "What is \"%s\"?\n", *argv);
  92                         explain();
  93                         return -1;
  94                 }
  95                 argc--; argv++;
  96         }
  97
  98         if (!dps || def_dp == -1) {
  99                 fprintf(stderr, "Illegal gred setup parameters \n");
 100                 return -1;
 101         }
 102
 103         memset(&opt, 0, sizeof(struct tc_gred_sopt));
 104         opt.DPs = dps;
 105         opt.def_DP = def_dp;
 106
 107         DPRINTF("TC_GRED: sending DPs=%d default=%d\n",opt.DPs,opt.def_DP);
 108         n->nlmsg_flags|=NLM_F_CREATE;
 109         tail = NLMSG_TAIL(n);
 110         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 111         addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
 112         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 113         return 0;
 114 }
 115 /*
 116 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 117 */
 118 static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
 119 {
 120         int ok=0;
 121         struct tc_gred_qopt opt;
 122         unsigned burst = 0;
 123         unsigned avpkt = 0;
 124         double probability = 0.02;
 125         unsigned rate = 0;
 126         int wlog;
 127         __u8 sbuf[256];
 128         struct rtattr *tail;
 129
 130         memset(&opt, 0, sizeof(opt));
 131
 132         while (argc > 0) {
 133                 if (strcmp(*argv, "limit") == 0) {
 134                         NEXT_ARG();
 135                         if (get_size(&opt.limit, *argv)) {
 136                                 fprintf(stderr, "Illegal \"limit\"\n");
 137                                 return -1;
 138                         }
 139                         ok++;
 140                 } else if (strcmp(*argv, "setup") == 0) {
 141                         if (ok) {
 142                                 fprintf(stderr, "Illegal \"setup\"\n");
 143                                 return -1;
 144                         }
 145                 return init_gred(qu,argc-1, argv+1,n);
 146
 147                 } else if (strcmp(*argv, "min") == 0) {
 148                         NEXT_ARG();
 149                         if (get_size(&opt.qth_min, *argv)) {
 150                                 fprintf(stderr, "Illegal \"min\"\n");
 151                                 return -1;
 152                         }
 153                         ok++;
 154                 } else if (strcmp(*argv, "max") == 0) {
 155                         NEXT_ARG();
 156                         if (get_size(&opt.qth_max, *argv)) {
 157                                 fprintf(stderr, "Illegal \"max\"\n");
 158                                 return -1;
 159                         }
 160                         ok++;
 161                 } else if (strcmp(*argv, "DP") == 0) {
 162                         NEXT_ARG();
 163                         opt.DP=strtol(*argv, (char **)NULL, 10);
 164                         DPRINTF ("\n ******* DP =%u\n",opt.DP);
 165                         if (opt.DP >MAX_DPs) { /* need a better error check */
 166                                 fprintf(stderr, "DP =%u \n",opt.DP);
 167                                 fprintf(stderr, "Illegal \"DP\"\n");
 168                                 fprintf(stderr, "GRED: only %d DPs are currently supported\n",MAX_DPs);
 169                                 return -1;
 170                         }
 171                         ok++;
 172                 } else if (strcmp(*argv, "burst") == 0) {
 173                         NEXT_ARG();
 174                         if (get_unsigned(&burst, *argv, 0)) {
 175                                 fprintf(stderr, "Illegal \"burst\"\n");
 176                                 return -1;
 177                         }
 178                         ok++;
 179                 } else if (strcmp(*argv, "avpkt") == 0) {
 180                         NEXT_ARG();
 181                         if (get_size(&avpkt, *argv)) {
 182                                 fprintf(stderr, "Illegal \"avpkt\"\n");
 183                                 return -1;
 184                         }
 185                         ok++;
 186                 } else if (strcmp(*argv, "probability") == 0) {
 187                         NEXT_ARG();
 188                         if (sscanf(*argv, "%lg", &probability) != 1) {
 189                                 fprintf(stderr, "Illegal \"probability\"\n");
 190                                 return -1;
 191                         }
 192                         ok++;
 193                 } else if (strcmp(*argv, "prio") == 0) {
 194                         NEXT_ARG();
 195                         opt.prio=strtol(*argv, (char **)NULL, 10);
 196                         /* some error check here */
 197                         ok++;
 198                 } else if (strcmp(*argv, "bandwidth") == 0) {
 199                         NEXT_ARG();
 200                         if (get_rate(&rate, *argv)) {
 201                                 fprintf(stderr, "Illegal \"bandwidth\"\n");
 202                                 return -1;
 203                         }
 204                         ok++;
 205                 } else if (strcmp(*argv, "help") == 0) {
 206                         explain();
 207                         return -1;
 208                 } else {
 209                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 210                         explain();
 211                         return -1;
 212                 }
 213                 argc--; argv++;
 214         }
 215
 216         if (rate == 0)
 217                 get_rate(&rate, "10Mbit");
 218
 219         if (!opt.qth_min || !opt.qth_max || !burst || !opt.limit || !avpkt ||
 220             (opt.DP<0)) {
 221                 fprintf(stderr, "Required parameter (min, max, burst, limit, "
 222                     "avpkt, DP) is missing\n");
 223                 return -1;
 224         }
 225
 226         if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
 227                 fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
 228                 return -1;
 229         }
 230         if (wlog >= 10)
 231                 fprintf(stderr, "GRED: WARNING. Burst %d seems to be to "
 232                     "large.\n", burst);
 233         opt.Wlog = wlog;
 234         if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
 235                 fprintf(stderr, "GRED: failed to calculate probability.\n");
 236                 return -1;
 237         }
 238         opt.Plog = wlog;
 239         if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
 240             {
 241                 fprintf(stderr, "GRED: failed to calculate idle damping "
 242                     "table.\n");
 243                 return -1;
 244         }
 245         opt.Scell_log = wlog;
 246
 247         tail = NLMSG_TAIL(n);
 248         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 249         addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
 250         addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
 251         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 252         return 0;
 253 }
 254
 255 static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 256 {
 257         struct rtattr *tb[TCA_GRED_STAB+1];
 258         struct tc_gred_qopt *qopt;
 259         int i;
 260         SPRINT_BUF(b1);
 261         SPRINT_BUF(b2);
 262         SPRINT_BUF(b3);
 263         SPRINT_BUF(b4);
 264         SPRINT_BUF(b5);
 265
 266         if (opt == NULL)
 267                 return 0;
 268
 269         parse_rtattr_nested(tb, TCA_GRED_STAB, opt);
 270
 271         if (tb[TCA_GRED_PARMS] == NULL)
 272                 return -1;
 273
 274         qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
 275         if (RTA_PAYLOAD(tb[TCA_GRED_PARMS])  < sizeof(*qopt)*MAX_DPs) {
 276                 fprintf(f,"\n GRED received message smaller than expected\n");
 277                 return -1;
 278                 }
 279
 280 /* Bad hack! should really return a proper message as shown above*/
 281
 282         for (i=0;i<MAX_DPs;i++, qopt++) {
 283                 if (qopt->DP >= MAX_DPs) continue;
 284                 fprintf(f, "\n DP:%d (prio %d) Average Queue %s Measured "
 285                     "Queue %s  ",
 286                         qopt->DP,
 287                         qopt->prio,
 288                         sprint_size(qopt->qave, b4),
 289                         sprint_size(qopt->backlog, b5));
 290                 fprintf(f, "\n\t Packet drops: %d (forced %d early %d)  ",
 291                         qopt->forced+qopt->early,
 292                         qopt->forced,
 293                         qopt->early);
 294                 fprintf(f, "\n\t Packet totals: %u (bytes %u)  ",
 295                         qopt->packets,
 296                         qopt->bytesin);
 297                 if (show_details)
 298                         fprintf(f, "\n limit %s min %s max %s ",
 299                                 sprint_size(qopt->limit, b1),
 300                                 sprint_size(qopt->qth_min, b2),
 301                                 sprint_size(qopt->qth_max, b3));
 302                                 fprintf(f, "ewma %u Plog %u Scell_log %u",
 303                                     qopt->Wlog, qopt->Plog, qopt->Scell_log);
 304         }
 305         return 0;
 306 }
 307
 308 struct qdisc_util gred_qdisc_util = {
 309         .id             = "gred",
 310         .parse_qopt     = gred_parse_opt,
 311         .print_qopt     = gred_print_opt,
 312 };