tc/q_fifo.c

   1 /*
   2  * q_fifo.c             FIFO.
   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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  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: ... <[p|b]fifo | pfifo_head_drop> [ limit NUMBER ]\n");
  28 }
  29
  30 static int fifo_parse_opt(struct qdisc_util *qu, int argc, char **argv,
  31                           struct nlmsghdr *n, const char *dev)
  32 {
  33         int ok = 0;
  34         struct tc_fifo_qopt opt = {};
  35
  36         while (argc > 0) {
  37                 if (strcmp(*argv, "limit") == 0) {
  38                         NEXT_ARG();
  39                         if (get_size(&opt.limit, *argv)) {
  40                                 fprintf(stderr, "%s: Illegal value for \"limit\": \"%s\"\n", qu->id, *argv);
  41                                 return -1;
  42                         }
  43                         ok++;
  44                 } else if (strcmp(*argv, "help") == 0) {
  45                         explain();
  46                         return -1;
  47                 } else {
  48                         fprintf(stderr, "%s: unknown parameter \"%s\"\n", qu->id, *argv);
  49                         explain();
  50                         return -1;
  51                 }
  52                 argc--; argv++;
  53         }
  54
  55         if (ok)
  56                 addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
  57         return 0;
  58 }
  59
  60 static int fifo_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
  61 {
  62         struct tc_fifo_qopt *qopt;
  63
  64         if (opt == NULL)
  65                 return 0;
  66
  67         if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
  68                 return -1;
  69         qopt = RTA_DATA(opt);
  70         if (strcmp(qu->id, "bfifo") == 0) {
  71                 SPRINT_BUF(b1);
  72                 print_uint(PRINT_JSON, "limit", NULL, qopt->limit);
  73                 print_string(PRINT_FP, NULL, "limit %s",
  74                              sprint_size(qopt->limit, b1));
  75         } else {
  76                 print_uint(PRINT_ANY, "limit", "limit %up", qopt->limit);
  77         }
  78         return 0;
  79 }
  80
  81
  82 struct qdisc_util bfifo_qdisc_util = {
  83         .id = "bfifo",
  84         .parse_qopt = fifo_parse_opt,
  85         .print_qopt = fifo_print_opt,
  86 };
  87
  88 struct qdisc_util pfifo_qdisc_util = {
  89         .id = "pfifo",
  90         .parse_qopt = fifo_parse_opt,
  91         .print_qopt = fifo_print_opt,
  92 };
  93
  94 struct qdisc_util pfifo_head_drop_qdisc_util = {
  95         .id = "pfifo_head_drop",
  96         .parse_qopt = fifo_parse_opt,
  97         .print_qopt = fifo_print_opt,
  98 };
  99
 100 struct qdisc_util pfifo_fast_qdisc_util = {
 101         .id = "pfifo_fast",
 102         .print_qopt = prio_print_opt,
 103 };