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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21
  22 #include "utils.h"
  23 #include "tc_util.h"
  24
  25 static void explain(void)
  26 {
  27         fprintf(stderr, "Usage: ... rr bands NUMBER priomap P1 P2... [multiqueue]\n");
  28 }
  29
  30
  31 static int rr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
  32 {
  33         int pmap_mode = 0;
  34         int idx = 0;
  35         struct tc_prio_qopt opt = {3, { 1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 } };
  36         struct rtattr *nest;
  37         unsigned char mq = 0;
  38
  39         while (argc > 0) {
  40                 if (strcmp(*argv, "bands") == 0) {
  41                         if (pmap_mode)
  42                                 explain();
  43                         NEXT_ARG();
  44                         if (get_integer(&opt.bands, *argv, 10)) {
  45                                 fprintf(stderr, "Illegal \"bands\"\n");
  46                                 return -1;
  47                         }
  48                 } else if (strcmp(*argv, "priomap") == 0) {
  49                         if (pmap_mode) {
  50                                 fprintf(stderr, "Error: duplicate priomap\n");
  51                                 return -1;
  52                         }
  53                         pmap_mode = 1;
  54                 } else if (strcmp(*argv, "help") == 0) {
  55                         explain();
  56                         return -1;
  57                 } else if (strcmp(*argv, "multiqueue") == 0) {
  58                         mq = 1;
  59                 } else {
  60                         unsigned int band;
  61
  62                         if (!pmap_mode) {
  63                                 fprintf(stderr, "What is \"%s\"?\n", *argv);
  64                                 explain();
  65                                 return -1;
  66                         }
  67                         if (get_unsigned(&band, *argv, 10)) {
  68                                 fprintf(stderr, "Illegal \"priomap\" element\n");
  69                                 return -1;
  70                         }
  71                         if (band > opt.bands) {
  72                                 fprintf(stderr, "\"priomap\" element is out of bands\n");
  73                                 return -1;
  74                         }
  75                         if (idx > TC_PRIO_MAX) {
  76                                 fprintf(stderr, "\"priomap\" index > TC_RR_MAX=%u\n", TC_PRIO_MAX);
  77                                 return -1;
  78                         }
  79                         opt.priomap[idx++] = band;
  80                 }
  81                 argc--; argv++;
  82         }
  83
  84         nest = addattr_nest_compat(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
  85         if (mq)
  86                 addattr_l(n, 1024, TCA_PRIO_MQ, NULL, 0);
  87         addattr_nest_compat_end(n, nest);
  88         return 0;
  89 }
  90
  91 static int rr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  92 {
  93         int i;
  94         struct tc_prio_qopt *qopt;
  95         struct rtattr *tb[TCA_PRIO_MAX + 1];
  96
  97         if (opt == NULL)
  98                 return 0;
  99
 100         if (parse_rtattr_nested_compat(tb, TCA_PRIO_MAX, opt, qopt,
 101                                                 sizeof(*qopt)))
 102                 return -1;
 103
 104         fprintf(f, "bands %u priomap ", qopt->bands);
 105         for (i = 0; i <= TC_PRIO_MAX; i++)
 106                 fprintf(f, " %d", qopt->priomap[i]);
 107
 108         if (tb[TCA_PRIO_MQ])
 109                 fprintf(f, " multiqueue: %s ",
 110                         rta_getattr_u8(tb[TCA_PRIO_MQ]) ? "on" : "off");
 111
 112         return 0;
 113 }
 114
 115 struct qdisc_util rr_qdisc_util = {
 116         .id             = "rr",
 117         .parse_qopt     = rr_parse_opt,
 118         .print_qopt     = rr_print_opt,
 119 };