tc/q_rr.c

   1 /*
   2  * q_rr.c               RR.
   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:     PJ Waskiewicz, <peter.p.waskiewicz.jr@intel.com>
  10  * Original Authors:    Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> (from PRIO)
  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: ... rr bands NUMBER priomap P1 P2... [multiqueue]\n");
  29 }
  30
  31
  32 static int rr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  33 {
  34         int pmap_mode = 0;
  35         int idx = 0;
  36         struct tc_prio_qopt opt = {3, { 1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 } };
  37         struct rtattr *nest;
  38         unsigned char mq = 0;
  39
  40         while (argc > 0) {
  41                 if (strcmp(*argv, "bands") == 0) {
  42                         if (pmap_mode)
  43                                 explain();
  44                         NEXT_ARG();
  45                         if (get_integer(&opt.bands, *argv, 10)) {
  46                                 fprintf(stderr, "Illegal \"bands\"\n");
  47                                 return -1;
  48                         }
  49                 } else if (strcmp(*argv, "priomap") == 0) {
  50                         if (pmap_mode) {
  51                                 fprintf(stderr, "Error: duplicate priomap\n");
  52                                 return -1;
  53                         }
  54                         pmap_mode = 1;
  55                 } else if (strcmp(*argv, "help") == 0) {
  56                         explain();
  57                         return -1;
  58                 } else if (strcmp(*argv, "multiqueue") == 0) {
  59                         mq = 1;
  60                 } else {
  61                         unsigned int band;
  62
  63                         if (!pmap_mode) {
  64                                 fprintf(stderr, "What is \"%s\"?\n", *argv);
  65                                 explain();
  66                                 return -1;
  67                         }
  68                         if (get_unsigned(&band, *argv, 10)) {
  69                                 fprintf(stderr, "Illegal \"priomap\" element\n");
  70                                 return -1;
  71                         }
  72                         if (band > opt.bands) {
  73                                 fprintf(stderr, "\"priomap\" element is out of bands\n");
  74                                 return -1;
  75                         }
  76                         if (idx > TC_PRIO_MAX) {
  77                                 fprintf(stderr, "\"priomap\" index > TC_RR_MAX=%u\n", TC_PRIO_MAX);
  78                                 return -1;
  79                         }
  80                         opt.priomap[idx++] = band;
  81                 }
  82                 argc--; argv++;
  83         }
  84
  85         nest = addattr_nest_compat(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
  86         if (mq)
  87                 addattr_l(n, 1024, TCA_PRIO_MQ, NULL, 0);
  88         addattr_nest_compat_end(n, nest);
  89         return 0;
  90 }
  91
  92 static int rr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  93 {
  94         int i;
  95         struct tc_prio_qopt *qopt;
  96         struct rtattr *tb[TCA_PRIO_MAX + 1];
  97
  98         if (opt == NULL)
  99                 return 0;
 100
 101         if (parse_rtattr_nested_compat(tb, TCA_PRIO_MAX, opt, qopt,
 102                                                 sizeof(*qopt)))
 103                 return -1;
 104
 105         fprintf(f, "bands %u priomap ", qopt->bands);
 106         for (i = 0; i <= TC_PRIO_MAX; i++)
 107                 fprintf(f, " %d", qopt->priomap[i]);
 108
 109         if (tb[TCA_PRIO_MQ])
 110                 fprintf(f, " multiqueue: %s ",
 111                         rta_getattr_u8(tb[TCA_PRIO_MQ]) ? "on" : "off");
 112
 113         return 0;
 114 }
 115
 116 struct qdisc_util rr_qdisc_util = {
 117         .id             = "rr",
 118         .parse_qopt     = rr_parse_opt,
 119         .print_qopt     = rr_print_opt,
 120 };