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) 2003-2008 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->ce_mask & TCA_ATTR_OPTS))
63 if (qdisc->q_opts->d_size < sizeof(*opts))
66 sfq = sfq_alloc(qdisc);
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 void sfq_dump_line(struct rtnl_qdisc *qdisc, struct nl_dump_params *p)
92 struct rtnl_sfq *sfq = sfq_qdisc(qdisc);
95 nl_dump(p, " quantum %u perturb %us", sfq->qs_quantum,
96 nl_ticks2us(sfq->qs_perturb * nl_get_hz()));
99 static void sfq_dump_details(struct rtnl_qdisc *qdisc, struct nl_dump_params *p)
101 struct rtnl_sfq *sfq = sfq_qdisc(qdisc);
104 nl_dump(p, "limit %u divisor %u",
105 sfq->qs_limit, sfq->qs_divisor);
108 static struct nl_msg *sfq_get_opts(struct rtnl_qdisc *qdisc)
110 struct rtnl_sfq *sfq;
111 struct tc_sfq_qopt opts;
114 sfq = sfq_qdisc(qdisc);
122 memset(&opts, 0, sizeof(opts));
123 opts.quantum = sfq->qs_quantum;
124 opts.perturb_period = sfq->qs_perturb;
125 opts.limit = sfq->qs_limit;
127 if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0)
137 * @name Attribute Access
142 * Set quantum of SFQ qdisc.
143 * @arg qdisc SFQ qdisc to be modified.
144 * @arg quantum New quantum in bytes.
145 * @return 0 on success or a negative error code.
147 int rtnl_sfq_set_quantum(struct rtnl_qdisc *qdisc, int quantum)
149 struct rtnl_sfq *sfq;
151 sfq = sfq_alloc(qdisc);
155 sfq->qs_quantum = quantum;
156 sfq->qs_mask |= SCH_SFQ_ATTR_QUANTUM;
162 * Get quantum of SFQ qdisc.
163 * @arg qdisc SFQ qdisc.
164 * @return Quantum in bytes or a negative error code.
166 int rtnl_sfq_get_quantum(struct rtnl_qdisc *qdisc)
168 struct rtnl_sfq *sfq;
170 sfq = sfq_qdisc(qdisc);
171 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_QUANTUM)
172 return sfq->qs_quantum;
178 * Set limit of SFQ qdisc.
179 * @arg qdisc SFQ qdisc to be modified.
180 * @arg limit New limit in number of packets.
181 * @return 0 on success or a negative error code.
183 int rtnl_sfq_set_limit(struct rtnl_qdisc *qdisc, int limit)
185 struct rtnl_sfq *sfq;
187 sfq = sfq_alloc(qdisc);
191 sfq->qs_limit = limit;
192 sfq->qs_mask |= SCH_SFQ_ATTR_LIMIT;
198 * Get limit of SFQ qdisc.
199 * @arg qdisc SFQ qdisc.
200 * @return Limit or a negative error code.
202 int rtnl_sfq_get_limit(struct rtnl_qdisc *qdisc)
204 struct rtnl_sfq *sfq;
206 sfq = sfq_qdisc(qdisc);
207 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_LIMIT)
208 return sfq->qs_limit;
214 * Set perturbation interval of SFQ qdisc.
215 * @arg qdisc SFQ qdisc to be modified.
216 * @arg perturb New perturbation interval in seconds.
217 * @note A value of 0 disables perturbation altogether.
218 * @return 0 on success or a negative error code.
220 int rtnl_sfq_set_perturb(struct rtnl_qdisc *qdisc, int perturb)
222 struct rtnl_sfq *sfq;
224 sfq = sfq_alloc(qdisc);
228 sfq->qs_perturb = perturb;
229 sfq->qs_mask |= SCH_SFQ_ATTR_PERTURB;
235 * Get perturbation interval of SFQ qdisc.
236 * @arg qdisc SFQ qdisc.
237 * @return Perturbation interval in seconds or a negative error code.
239 int rtnl_sfq_get_perturb(struct rtnl_qdisc *qdisc)
241 struct rtnl_sfq *sfq;
243 sfq = sfq_qdisc(qdisc);
244 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_PERTURB)
245 return sfq->qs_perturb;
251 * Get divisor of SFQ qdisc.
252 * @arg qdisc SFQ qdisc.
253 * @return Divisor in number of entries or a negative error code.
255 int rtnl_sfq_get_divisor(struct rtnl_qdisc *qdisc)
257 struct rtnl_sfq *sfq;
259 sfq = sfq_qdisc(qdisc);
260 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_DIVISOR)
261 return sfq->qs_divisor;
268 static struct rtnl_qdisc_ops sfq_ops = {
270 .qo_msg_parser = sfq_msg_parser,
271 .qo_free_data = sfq_free_data,
273 [NL_DUMP_LINE] = sfq_dump_line,
274 [NL_DUMP_DETAILS] = sfq_dump_details,
276 .qo_get_opts = sfq_get_opts,
279 static void __init sfq_init(void)
281 rtnl_qdisc_register(&sfq_ops);
284 static void __exit sfq_exit(void)
286 rtnl_qdisc_unregister(&sfq_ops);