2 * lib/route/sch/sfq.c SFQ 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 sfq Stochastic Fairness Queueing (SFQ)
17 * @par Parameter Description
18 * - \b Quantum: Number of bytes to send out per slot and round.
19 * - \b Perturbation: Timer period between changing the hash function.
20 * - \b Limit: Upper limit of queue in number of packets before SFQ starts
22 * - \b Divisor: Hash table divisor, i.e. size of hash table.
26 #include <netlink-local.h>
27 #include <netlink-tc.h>
28 #include <netlink/netlink.h>
29 #include <netlink/utils.h>
30 #include <netlink/route/qdisc.h>
31 #include <netlink/route/qdisc-modules.h>
32 #include <netlink/route/sch/sfq.h>
35 #define SCH_SFQ_ATTR_QUANTUM 0x01
36 #define SCH_SFQ_ATTR_PERTURB 0x02
37 #define SCH_SFQ_ATTR_LIMIT 0x04
38 #define SCH_SFQ_ATTR_DIVISOR 0x08
39 #define SCH_SFQ_ATTR_FLOWS 0x10
42 static inline struct rtnl_sfq *sfq_qdisc(struct rtnl_qdisc *qdisc)
44 return (struct rtnl_sfq *) qdisc->q_subdata;
47 static inline struct rtnl_sfq *sfq_alloc(struct rtnl_qdisc *qdisc)
49 if (!qdisc->q_subdata)
50 qdisc->q_subdata = calloc(1, sizeof(struct rtnl_sfq));
52 return sfq_qdisc(qdisc);
55 static int sfq_msg_parser(struct rtnl_qdisc *qdisc)
58 struct tc_sfq_qopt *opts;
60 if (!(qdisc->q_mask & TCA_ATTR_OPTS))
63 if (qdisc->q_opts->d_size < sizeof(*opts))
64 return nl_error(EINVAL, "SFQ specific options size mismatch");
66 sfq = sfq_alloc(qdisc);
68 return nl_errno(ENOMEM);
70 opts = (struct tc_sfq_qopt *) qdisc->q_opts->d_data;
72 sfq->qs_quantum = opts->quantum;
73 sfq->qs_perturb = opts->perturb_period;
74 sfq->qs_limit = opts->limit;
75 sfq->qs_divisor = opts->divisor;
76 sfq->qs_flows = opts->flows;
78 sfq->qs_mask = (SCH_SFQ_ATTR_QUANTUM | SCH_SFQ_ATTR_PERTURB |
79 SCH_SFQ_ATTR_LIMIT | SCH_SFQ_ATTR_DIVISOR |
85 static void sfq_free_data(struct rtnl_qdisc *qdisc)
87 free(qdisc->q_subdata);
90 static int sfq_dump_brief(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
93 struct rtnl_sfq *sfq = sfq_qdisc(qdisc);
96 dp_dump(p, " quantum %u perturb %us",
98 nl_ticks2us(sfq->qs_perturb * nl_get_hz()));
103 static int sfq_dump_full(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
106 struct rtnl_sfq *sfq = sfq_qdisc(qdisc);
109 dp_dump(p, "limit %u divisor %u",
110 sfq->qs_limit, sfq->qs_divisor);
115 static struct nl_msg *sfq_get_opts(struct rtnl_qdisc *qdisc)
117 struct rtnl_sfq *sfq;
118 struct tc_sfq_qopt opts;
121 sfq = sfq_qdisc(qdisc);
125 msg = nlmsg_build_no_hdr();
129 memset(&opts, 0, sizeof(opts));
130 opts.quantum = sfq->qs_quantum;
131 opts.perturb_period = sfq->qs_perturb;
132 opts.limit = sfq->qs_limit;
134 if (nlmsg_append(msg, &opts, sizeof(opts), 0) < 0)
144 * @name Attribute Access
149 * Set quantum of SFQ qdisc.
150 * @arg qdisc SFQ qdisc to be modified.
151 * @arg quantum New quantum in bytes.
152 * @return 0 on success or a negative error code.
154 int rtnl_sfq_set_quantum(struct rtnl_qdisc *qdisc, int quantum)
156 struct rtnl_sfq *sfq;
158 sfq = sfq_alloc(qdisc);
160 return nl_errno(ENOMEM);
162 sfq->qs_quantum = quantum;
163 sfq->qs_mask |= SCH_SFQ_ATTR_QUANTUM;
169 * Get quantum of SFQ qdisc.
170 * @arg qdisc SFQ qdisc.
171 * @return Quantum in bytes or a negative error code.
173 int rtnl_sfq_get_quantum(struct rtnl_qdisc *qdisc)
175 struct rtnl_sfq *sfq;
177 sfq = sfq_qdisc(qdisc);
178 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_QUANTUM)
179 return sfq->qs_quantum;
181 return nl_errno(ENOENT);
185 * Set limit of SFQ qdisc.
186 * @arg qdisc SFQ qdisc to be modified.
187 * @arg limit New limit in number of packets.
188 * @return 0 on success or a negative error code.
190 int rtnl_sfq_set_limit(struct rtnl_qdisc *qdisc, int limit)
192 struct rtnl_sfq *sfq;
194 sfq = sfq_alloc(qdisc);
196 return nl_errno(ENOMEM);
198 sfq->qs_limit = limit;
199 sfq->qs_mask |= SCH_SFQ_ATTR_LIMIT;
205 * Get limit of SFQ qdisc.
206 * @arg qdisc SFQ qdisc.
207 * @return Limit or a negative error code.
209 int rtnl_sfq_get_limit(struct rtnl_qdisc *qdisc)
211 struct rtnl_sfq *sfq;
213 sfq = sfq_qdisc(qdisc);
214 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_LIMIT)
215 return sfq->qs_limit;
217 return nl_errno(ENOENT);
221 * Set perturbation interval of SFQ qdisc.
222 * @arg qdisc SFQ qdisc to be modified.
223 * @arg perturb New perturbation interval in seconds.
224 * @note A value of 0 disables perturbation altogether.
225 * @return 0 on success or a negative error code.
227 int rtnl_sfq_set_perturb(struct rtnl_qdisc *qdisc, int perturb)
229 struct rtnl_sfq *sfq;
231 sfq = sfq_alloc(qdisc);
233 return nl_errno(ENOMEM);
235 sfq->qs_perturb = perturb;
236 sfq->qs_mask |= SCH_SFQ_ATTR_PERTURB;
242 * Get perturbation interval of SFQ qdisc.
243 * @arg qdisc SFQ qdisc.
244 * @return Perturbation interval in seconds or a negative error code.
246 int rtnl_sfq_get_perturb(struct rtnl_qdisc *qdisc)
248 struct rtnl_sfq *sfq;
250 sfq = sfq_qdisc(qdisc);
251 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_PERTURB)
252 return sfq->qs_perturb;
254 return nl_errno(ENOENT);
258 * Get divisor of SFQ qdisc.
259 * @arg qdisc SFQ qdisc.
260 * @return Divisor in number of entries or a negative error code.
262 int rtnl_sfq_get_divisor(struct rtnl_qdisc *qdisc)
264 struct rtnl_sfq *sfq;
266 sfq = sfq_qdisc(qdisc);
267 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_DIVISOR)
268 return sfq->qs_divisor;
270 return nl_errno(ENOENT);
275 static struct rtnl_qdisc_ops sfq_ops = {
277 .qo_msg_parser = sfq_msg_parser,
278 .qo_free_data = sfq_free_data,
279 .qo_dump[NL_DUMP_BRIEF] = sfq_dump_brief,
280 .qo_dump[NL_DUMP_FULL] = sfq_dump_full,
281 .qo_get_opts = sfq_get_opts,
284 static void __init sfq_init(void)
286 rtnl_qdisc_register(&sfq_ops);
289 static void __exit sfq_exit(void)
291 rtnl_qdisc_unregister(&sfq_ops);