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 <syslog.h>
  17 #include <fcntl.h>
  18 #include <math.h>
  19 #include <sys/socket.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         return;
  43 }
  44
  45 int check_size_table_opts(struct tc_sizespec *s)
  46 {
  47         return s->linklayer >= LINKLAYER_ETHERNET || s->mpu != 0 ||
  48                                                         s->overhead != 0;
  49 }
  50
  51 int parse_size_table(int *argcp, char ***argvp, struct tc_sizespec *sp)
  52 {
  53         char **argv = *argvp;
  54         int argc = *argcp;
  55         struct tc_sizespec s;
  56
  57         memset(&s, 0, sizeof(s));
  58
  59         NEXT_ARG();
  60         if (matches(*argv, "help") == 0) {
  61                 stab_help();
  62                 return -1;
  63         }
  64         while (argc > 0) {
  65                 if (matches(*argv, "mtu") == 0) {
  66                         NEXT_ARG();
  67                         if (s.mtu)
  68                                 duparg("mtu", *argv);
  69                         if (get_u32(&s.mtu, *argv, 10)) {
  70                                 invarg("mtu", "invalid mtu");
  71                                 return -1;
  72                         }
  73                 } else if (matches(*argv, "mpu") == 0) {
  74                         NEXT_ARG();
  75                         if (s.mpu)
  76                                 duparg("mpu", *argv);
  77                         if (get_u32(&s.mpu, *argv, 10)) {
  78                                 invarg("mpu", "invalid mpu");
  79                                 return -1;
  80                         }
  81                 } else if (matches(*argv, "overhead") == 0) {
  82                         NEXT_ARG();
  83                         if (s.overhead)
  84                                 duparg("overhead", *argv);
  85                         if (get_integer(&s.overhead, *argv, 10)) {
  86                                 invarg("overhead", "invalid overhead");
  87                                 return -1;
  88                         }
  89                 } else if (matches(*argv, "tsize") == 0) {
  90                         NEXT_ARG();
  91                         if (s.tsize)
  92                                 duparg("tsize", *argv);
  93                         if (get_u32(&s.tsize, *argv, 10)) {
  94                                 invarg("tsize", "invalid table size");
  95                                 return -1;
  96                         }
  97                 } else if (matches(*argv, "linklayer") == 0) {
  98                         NEXT_ARG();
  99                         if (s.linklayer != LINKLAYER_UNSPEC)
 100                                 duparg("linklayer", *argv);
 101                         if (get_linklayer(&s.linklayer, *argv)) {
 102                                 invarg("linklayer", "invalid linklayer");
 103                                 return -1;
 104                         }
 105                 } else
 106                         break;
 107                 argc--; argv++;
 108         }
 109
 110         if (!check_size_table_opts(&s))
 111                 return -1;
 112
 113         *sp = s;
 114         *argvp = argv;
 115         *argcp = argc;
 116         return 0;
 117 }
 118
 119 void print_size_table(FILE *fp, const char *prefix, struct rtattr *rta)
 120 {
 121         struct rtattr *tb[TCA_STAB_MAX + 1];
 122         SPRINT_BUF(b1);
 123
 124         parse_rtattr_nested(tb, TCA_STAB_MAX, rta);
 125
 126         if (tb[TCA_STAB_BASE]) {
 127                 struct tc_sizespec s = {0};
 128                 memcpy(&s, RTA_DATA(tb[TCA_STAB_BASE]),
 129                                 MIN(RTA_PAYLOAD(tb[TCA_STAB_BASE]), sizeof(s)));
 130
 131                 fprintf(fp, "%s", prefix);
 132                 if (s.linklayer)
 133                         fprintf(fp, "linklayer %s ",
 134                                         sprint_linklayer(s.linklayer, b1));
 135                 if (s.overhead)
 136                         fprintf(fp, "overhead %d ", s.overhead);
 137                 if (s.mpu)
 138                         fprintf(fp, "mpu %u ", s.mpu);
 139                 if (s.mtu)
 140                         fprintf(fp, "mtu %u ", s.mtu);
 141                 if (s.tsize)
 142                         fprintf(fp, "tsize %u ", s.tsize);
 143         }
 144
 145 #if 0
 146         if (tb[TCA_STAB_DATA]) {
 147                 unsigned i, j, dlen;
 148                 __u16 *data = RTA_DATA(tb[TCA_STAB_DATA]);
 149                 dlen = RTA_PAYLOAD(tb[TCA_STAB_DATA]) / sizeof(__u16);
 150
 151                 fprintf(fp, "\n%sstab data:", prefix);
 152                 for (i = 0; i < dlen/12; i++) {
 153                         fprintf(fp, "\n%s %3u:", prefix, i * 12);
 154                         for (j = 0; i * 12 + j < dlen; j++)
 155                                 fprintf(fp, " %05x", data[i * 12 + j]);
 156                 }
 157         }
 158 #endif
 159 }
 160