2 * lib/route/sch/red.c RED Qdisc
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
9 * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
14 * @defgroup red Random Early Detection (RED)
19 #include <netlink-local.h>
20 #include <netlink-tc.h>
21 #include <netlink/netlink.h>
22 #include <netlink/utils.h>
23 #include <netlink/route/qdisc.h>
24 #include <netlink/route/qdisc-modules.h>
25 #include <netlink/route/sch/red.h>
28 #define RED_ATTR_LIMIT 0x01
29 #define RED_ATTR_QTH_MIN 0x02
30 #define RED_ATTR_QTH_MAX 0x04
31 #define RED_ATTR_FLAGS 0x08
32 #define RED_ATTR_WLOG 0x10
33 #define RED_ATTR_PLOG 0x20
34 #define RED_ATTR_SCELL_LOG 0x40
37 static inline struct rtnl_red *red_qdisc(struct rtnl_qdisc *qdisc)
39 return (struct rtnl_red *) qdisc->q_subdata;
42 static inline struct rtnl_red *red_alloc(struct rtnl_qdisc *qdisc)
44 if (!qdisc->q_subdata)
45 qdisc->q_subdata = calloc(1, sizeof(struct rtnl_red));
47 return red_qdisc(qdisc);
50 static struct nla_policy red_policy[TCA_RED_MAX+1] = {
51 [TCA_RED_PARMS] = { .minlen = sizeof(struct tc_red_qopt) },
54 static int red_msg_parser(struct rtnl_qdisc *qdisc)
56 struct nlattr *tb[TCA_RED_MAX+1];
58 struct tc_red_qopt *opts;
61 if (!(qdisc->q_mask & TCA_ATTR_OPTS))
64 err = tca_parse(tb, TCA_RED_MAX, (struct rtnl_tca *) qdisc, red_policy);
68 if (!tb[TCA_RED_PARMS])
69 return nl_error(EINVAL, "Missing TCA_RED_PARMS");
71 red = red_alloc(qdisc);
73 return nl_errno(ENOMEM);
75 opts = nla_data(tb[TCA_RED_PARMS]);
77 red->qr_limit = opts->limit;
78 red->qr_qth_min = opts->qth_min;
79 red->qr_qth_max = opts->qth_max;
80 red->qr_flags = opts->flags;
81 red->qr_wlog = opts->Wlog;
82 red->qr_plog = opts->Plog;
83 red->qr_scell_log = opts->Scell_log;
85 red->qr_mask = (RED_ATTR_LIMIT | RED_ATTR_QTH_MIN | RED_ATTR_QTH_MAX |
86 RED_ATTR_FLAGS | RED_ATTR_WLOG | RED_ATTR_PLOG |
92 static int red_dump_brief(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
95 struct rtnl_red *red = red_qdisc(qdisc);
98 /* XXX: limit, min, max, flags */
104 static int red_dump_full(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
107 struct rtnl_red *red = red_qdisc(qdisc);
110 /* XXX: wlog, plog, scell_log */
116 static int red_dump_stats(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
119 struct rtnl_red *red = red_qdisc(qdisc);
128 static struct nl_msg *red_get_opts(struct rtnl_qdisc *qdisc)
130 struct rtnl_red *red;
133 red = red_qdisc(qdisc);
137 msg = nlmsg_build_no_hdr();
142 memset(&opts, 0, sizeof(opts));
143 opts.quantum = sfq->qs_quantum;
144 opts.perturb_period = sfq->qs_perturb;
145 opts.limit = sfq->qs_limit;
147 if (nlmsg_append(msg, &opts, sizeof(opts), 0) < 0)
158 * @name Attribute Access
163 * Set limit of RED qdisc.
164 * @arg qdisc RED qdisc to be modified.
165 * @arg limit New limit in number of packets.
166 * @return 0 on success or a negative error code.
168 int rtnl_red_set_limit(struct rtnl_qdisc *qdisc, int limit)
170 struct rtnl_red *red;
172 red = red_alloc(qdisc);
174 return nl_errno(ENOMEM);
176 red->qr_limit = limit;
177 red->qr_mask |= RED_ATTR_LIMIT;
183 * Get limit of RED qdisc.
184 * @arg qdisc RED qdisc.
185 * @return Limit or a negative error code.
187 int rtnl_red_get_limit(struct rtnl_qdisc *qdisc)
189 struct rtnl_red *red;
191 red = red_qdisc(qdisc);
192 if (red && (red->qr_mask & RED_ATTR_LIMIT))
193 return red->qr_limit;
195 return nl_errno(ENOENT);
200 static struct rtnl_qdisc_ops red_ops = {
202 .qo_msg_parser = red_msg_parser,
203 .qo_dump[NL_DUMP_BRIEF] = red_dump_brief,
204 .qo_dump[NL_DUMP_FULL] = red_dump_full,
205 .qo_dump[NL_DUMP_STATS] = red_dump_stats,
206 .qo_get_opts = red_get_opts,
209 static void __init red_init(void)
211 rtnl_qdisc_register(&red_ops);
214 static void __exit red_exit(void)
216 rtnl_qdisc_unregister(&red_ops);