tc/tc_stab.c

   1 /*
   2  * tc_stab.c            "tc qdisc ... stab *".
   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:     Jussi Kivilinna, <jussi.kivilinna@mbnet.fi>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <math.h>
  18 #include <sys/socket.h>
  19 #include <sys/param.h>
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #include <string.h>
  23 #include <malloc.h>
  24
  25 #include "utils.h"
  26 #include "tc_util.h"
  27 #include "tc_core.h"
  28 #include "tc_common.h"
  29
  30 static void stab_help(void)
  31 {
  32         fprintf(stderr,
  33                 "Usage: ... stab [ mtu BYTES ] [ tsize SLOTS ] [ mpu BYTES ]\n"
  34                 "                [ overhead BYTES ] [ linklayer TYPE ] ...\n"
  35                 "   mtu       : max packet size we create rate map for {2047}\n"
  36                 "   tsize     : how many slots should size table have {512}\n"
  37                 "   mpu       : minimum packet size used in rate computations\n"
  38                 "   overhead  : per-packet size overhead used in rate computations\n"
  39                 "   linklayer : adapting to a linklayer e.g. atm\n"
  40                 "Example: ... stab overhead 20 linklayer atm\n");
  41
  42 }
  43
  44 int check_size_table_opts(struct tc_sizespec *s)
  45 {
  46         return s->linklayer >= LINKLAYER_ETHERNET || s->mpu != 0 ||
  47                                                         s->overhead != 0;
  48 }
  49
  50 int parse_size_table(int *argcp, char ***argvp, struct tc_sizespec *sp)
  51 {
  52         char **argv = *argvp;
  53         int argc = *argcp;
  54         struct tc_sizespec s = {};
  55
  56         NEXT_ARG();
  57         if (matches(*argv, "help") == 0) {
  58                 stab_help();
  59                 return -1;
  60         }
  61         while (argc > 0) {
  62                 if (matches(*argv, "mtu") == 0) {
  63                         NEXT_ARG();
  64                         if (s.mtu)
  65                                 duparg("mtu", *argv);
  66                         if (get_u32(&s.mtu, *argv, 10))
  67                                 invarg("mtu", "invalid mtu");
  68                 } else if (matches(*argv, "mpu") == 0) {
  69                         NEXT_ARG();
  70                         if (s.mpu)
  71                                 duparg("mpu", *argv);
  72                         if (get_u32(&s.mpu, *argv, 10))
  73                                 invarg("mpu", "invalid mpu");
  74                 } else if (matches(*argv, "overhead") == 0) {
  75                         NEXT_ARG();
  76                         if (s.overhead)
  77                                 duparg("overhead", *argv);
  78                         if (get_integer(&s.overhead, *argv, 10))
  79                                 invarg("overhead", "invalid overhead");
  80                 } else if (matches(*argv, "tsize") == 0) {
  81                         NEXT_ARG();
  82                         if (s.tsize)
  83                                 duparg("tsize", *argv);
  84                         if (get_u32(&s.tsize, *argv, 10))
  85                                 invarg("tsize", "invalid table size");
  86                 } else if (matches(*argv, "linklayer") == 0) {
  87                         NEXT_ARG();
  88                         if (s.linklayer != LINKLAYER_UNSPEC)
  89                                 duparg("linklayer", *argv);
  90                         if (get_linklayer(&s.linklayer, *argv))
  91                                 invarg("linklayer", "invalid linklayer");
  92                 } else
  93                         break;
  94                 argc--; argv++;
  95         }
  96
  97         if (!check_size_table_opts(&s))
  98                 return -1;
  99
 100         *sp = s;
 101         *argvp = argv;
 102         *argcp = argc;
 103         return 0;
 104 }
 105
 106 void print_size_table(FILE *fp, const char *prefix, struct rtattr *rta)
 107 {
 108         struct rtattr *tb[TCA_STAB_MAX + 1];
 109
 110         SPRINT_BUF(b1);
 111
 112         parse_rtattr_nested(tb, TCA_STAB_MAX, rta);
 113
 114         if (tb[TCA_STAB_BASE]) {
 115                 struct tc_sizespec s = {0};
 116
 117                 memcpy(&s, RTA_DATA(tb[TCA_STAB_BASE]),
 118                                 MIN(RTA_PAYLOAD(tb[TCA_STAB_BASE]), sizeof(s)));
 119
 120                 fprintf(fp, "%s", prefix);
 121                 if (s.linklayer)
 122                         fprintf(fp, "linklayer %s ",
 123                                         sprint_linklayer(s.linklayer, b1));
 124                 if (s.overhead)
 125                         fprintf(fp, "overhead %d ", s.overhead);
 126                 if (s.mpu)
 127                         fprintf(fp, "mpu %u ", s.mpu);
 128                 if (s.mtu)
 129                         fprintf(fp, "mtu %u ", s.mtu);
 130                 if (s.tsize)
 131                         fprintf(fp, "tsize %u ", s.tsize);
 132         }
 133
 134 #if 0
 135         if (tb[TCA_STAB_DATA]) {
 136                 unsigned int i, j, dlen;
 137                 __u16 *data = RTA_DATA(tb[TCA_STAB_DATA]);
 138
 139                 dlen = RTA_PAYLOAD(tb[TCA_STAB_DATA]) / sizeof(__u16);
 140
 141                 fprintf(fp, "\n%sstab data:", prefix);
 142                 for (i = 0; i < dlen/12; i++) {
 143                         fprintf(fp, "\n%s %3u:", prefix, i * 12);
 144                         for (j = 0; i * 12 + j < dlen; j++)
 145                                 fprintf(fp, " %05x", data[i * 12 + j]);
 146                 }
 147         }
 148 #endif
 149 }