libnl  3.2.24-rc1
plug.c
1 
2 /*
3  * src/lib/cli/qdisc/plug.c plug module for CLI lib
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation version 2.1
8  * of the License.
9  *
10  * Copyright (c) 2012 Shriram Rajagopalan <rshriram@cs.ubc.ca>
11  */
12 
13 #include <netlink/cli/utils.h>
14 #include <netlink/cli/tc.h>
15 #include <netlink/route/qdisc/plug.h>
16 
17 static void print_usage(void)
18 {
19  printf(
20 "Usage: nl-qdisc-add [...] plug [OPTIONS]...\n"
21 "\n"
22 "OPTIONS\n"
23 " --help Show this help text.\n"
24 " --limit Maximum queue length in bytes.\n"
25 " --buffer create a new buffer(plug) and queue incoming traffic into it.\n"
26 " --release-one release traffic from previous buffer.\n"
27 " --release-indefinite stop buffering and release all (buffered and new) packets.\n"
28 "\n"
29 "EXAMPLE"
30 " # Attach plug qdisc with 32KB queue size to ifb0\n"
31 " nl-qdisc-add --dev=ifb0 --parent=root plug --limit=32768\n"
32 " # Plug network traffic arriving at ifb0\n"
33 " nl-qdisc-add --dev=ifb0 --parent=root --update plug --buffer\n"
34 " # Unplug traffic arriving at ifb0 indefinitely\n"
35 " nl-qdisc-add --dev=ifb0 --parent=root --update plug --release-indefinite\n\n"
36 " # If operating in output buffering mode:\n"
37 " # at time t=t0, create a new output buffer b0 to hold network output\n"
38 " nl-qdisc-add --dev=ifb0 --parent=root --update plug --buffer\n\n"
39 " # at time t=t1, take a checkpoint c0, create a new output buffer b1\n"
40 " nl-qdisc-add --dev=ifb0 --parent=root --update plug --buffer\n"
41 " # at time t=t1+r, after c0 is committed, release b0\n"
42 " nl-qdisc-add --dev=ifb0 --parent=root --update plug --release-one\n\n"
43 " # at time t=t2, take a checkpoint c1, create a new output buffer b2\n"
44 " nl-qdisc-add --dev=ifb0 --parent=root --update plug --buffer\n"
45 " # at time t=t2+r, after c1 is committed, release b1\n"
46 " nl-qdisc-add --dev=ifb0 --parent=root --update plug --release-one\n");
47 }
48 
49 static void plug_parse_argv(struct rtnl_tc *tc, int argc, char **argv)
50 {
51  struct rtnl_qdisc *qdisc = (struct rtnl_qdisc *) tc;
52 
53  for (;;) {
54  int c, optidx = 0;
55  enum {
56  ARG_LIMIT = 257,
57  ARG_BUFFER = 258,
58  ARG_RELEASE_ONE = 259,
59  ARG_RELEASE_INDEFINITE = 260,
60  };
61  static struct option long_opts[] = {
62  { "help", 0, 0, 'h' },
63  { "limit", 1, 0, ARG_LIMIT },
64  { "buffer", 0, 0, ARG_BUFFER },
65  { "release-one", 0, 0, ARG_RELEASE_ONE },
66  { "release-indefinite", 0, 0, ARG_RELEASE_INDEFINITE },
67  { 0, 0, 0, 0 }
68  };
69 
70  c = getopt_long(argc, argv, "h", long_opts, &optidx);
71  if (c == -1)
72  break;
73 
74  switch (c) {
75  case 'h':
76  print_usage();
77  return;
78 
79  case ARG_LIMIT:
80  rtnl_qdisc_plug_set_limit(qdisc, nl_cli_parse_u32(optarg));
81  break;
82 
83  case ARG_BUFFER:
84  rtnl_qdisc_plug_buffer(qdisc);
85  break;
86 
87  case ARG_RELEASE_ONE:
88  rtnl_qdisc_plug_release_one(qdisc);
89  break;
90 
91  case ARG_RELEASE_INDEFINITE:
92  rtnl_qdisc_plug_release_indefinite(qdisc);
93  break;
94  }
95  }
96 }
97 
98 static struct nl_cli_tc_module plug_module =
99 {
100  .tm_name = "plug",
101  .tm_type = RTNL_TC_TYPE_QDISC,
102  .tm_parse_argv = plug_parse_argv,
103 };
104 
105 static void __init plug_init(void)
106 {
107  nl_cli_tc_register(&plug_module);
108 }
109 
110 static void __exit plug_exit(void)
111 {
112  nl_cli_tc_unregister(&plug_module);
113 }