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