libnl 1.1
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00001 /* 00002 * lib/route/sch/sfq.c SFQ Qdisc 00003 * 00004 * This library is free software; you can redistribute it and/or 00005 * modify it under the terms of the GNU Lesser General Public 00006 * License as published by the Free Software Foundation version 2.1 00007 * of the License. 00008 * 00009 * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> 00010 */ 00011 00012 /** 00013 * @ingroup qdisc_api 00014 * @defgroup sfq Stochastic Fairness Queueing (SFQ) 00015 * @brief 00016 * 00017 * @par Parameter Description 00018 * - \b Quantum: Number of bytes to send out per slot and round. 00019 * - \b Perturbation: Timer period between changing the hash function. 00020 * - \b Limit: Upper limit of queue in number of packets before SFQ starts 00021 * dropping packets. 00022 * - \b Divisor: Hash table divisor, i.e. size of hash table. 00023 * @{ 00024 */ 00025 00026 #include <netlink-local.h> 00027 #include <netlink-tc.h> 00028 #include <netlink/netlink.h> 00029 #include <netlink/utils.h> 00030 #include <netlink/route/qdisc.h> 00031 #include <netlink/route/qdisc-modules.h> 00032 #include <netlink/route/sch/sfq.h> 00033 00034 /** @cond SKIP */ 00035 #define SCH_SFQ_ATTR_QUANTUM 0x01 00036 #define SCH_SFQ_ATTR_PERTURB 0x02 00037 #define SCH_SFQ_ATTR_LIMIT 0x04 00038 #define SCH_SFQ_ATTR_DIVISOR 0x08 00039 #define SCH_SFQ_ATTR_FLOWS 0x10 00040 /** @endcond */ 00041 00042 static inline struct rtnl_sfq *sfq_qdisc(struct rtnl_qdisc *qdisc) 00043 { 00044 return (struct rtnl_sfq *) qdisc->q_subdata; 00045 } 00046 00047 static inline struct rtnl_sfq *sfq_alloc(struct rtnl_qdisc *qdisc) 00048 { 00049 if (!qdisc->q_subdata) 00050 qdisc->q_subdata = calloc(1, sizeof(struct rtnl_sfq)); 00051 00052 return sfq_qdisc(qdisc); 00053 } 00054 00055 static int sfq_msg_parser(struct rtnl_qdisc *qdisc) 00056 { 00057 struct rtnl_sfq *sfq; 00058 struct tc_sfq_qopt *opts; 00059 00060 if (!(qdisc->ce_mask & TCA_ATTR_OPTS)) 00061 return 0; 00062 00063 if (qdisc->q_opts->d_size < sizeof(*opts)) 00064 return nl_error(EINVAL, "SFQ specific options size mismatch"); 00065 00066 sfq = sfq_alloc(qdisc); 00067 if (!sfq) 00068 return nl_errno(ENOMEM); 00069 00070 opts = (struct tc_sfq_qopt *) qdisc->q_opts->d_data; 00071 00072 sfq->qs_quantum = opts->quantum; 00073 sfq->qs_perturb = opts->perturb_period; 00074 sfq->qs_limit = opts->limit; 00075 sfq->qs_divisor = opts->divisor; 00076 sfq->qs_flows = opts->flows; 00077 00078 sfq->qs_mask = (SCH_SFQ_ATTR_QUANTUM | SCH_SFQ_ATTR_PERTURB | 00079 SCH_SFQ_ATTR_LIMIT | SCH_SFQ_ATTR_DIVISOR | 00080 SCH_SFQ_ATTR_FLOWS); 00081 00082 return 0; 00083 } 00084 00085 static void sfq_free_data(struct rtnl_qdisc *qdisc) 00086 { 00087 free(qdisc->q_subdata); 00088 } 00089 00090 static int sfq_dump_brief(struct rtnl_qdisc *qdisc, struct nl_dump_params *p, 00091 int line) 00092 { 00093 struct rtnl_sfq *sfq = sfq_qdisc(qdisc); 00094 00095 if (sfq) 00096 dp_dump(p, " quantum %u perturb %us", 00097 sfq->qs_quantum, 00098 nl_ticks2us(sfq->qs_perturb * nl_get_hz())); 00099 00100 return line; 00101 } 00102 00103 static int sfq_dump_full(struct rtnl_qdisc *qdisc, struct nl_dump_params *p, 00104 int line) 00105 { 00106 struct rtnl_sfq *sfq = sfq_qdisc(qdisc); 00107 00108 if (sfq) 00109 dp_dump(p, "limit %u divisor %u", 00110 sfq->qs_limit, sfq->qs_divisor); 00111 00112 return line; 00113 } 00114 00115 static struct nl_msg *sfq_get_opts(struct rtnl_qdisc *qdisc) 00116 { 00117 struct rtnl_sfq *sfq; 00118 struct tc_sfq_qopt opts; 00119 struct nl_msg *msg; 00120 00121 sfq = sfq_qdisc(qdisc); 00122 if (!sfq) 00123 return NULL; 00124 00125 msg = nlmsg_alloc(); 00126 if (!msg) 00127 goto errout; 00128 00129 memset(&opts, 0, sizeof(opts)); 00130 opts.quantum = sfq->qs_quantum; 00131 opts.perturb_period = sfq->qs_perturb; 00132 opts.limit = sfq->qs_limit; 00133 00134 if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0) 00135 goto errout; 00136 00137 return msg; 00138 errout: 00139 nlmsg_free(msg); 00140 return NULL; 00141 } 00142 00143 /** 00144 * @name Attribute Access 00145 * @{ 00146 */ 00147 00148 /** 00149 * Set quantum of SFQ qdisc. 00150 * @arg qdisc SFQ qdisc to be modified. 00151 * @arg quantum New quantum in bytes. 00152 * @return 0 on success or a negative error code. 00153 */ 00154 int rtnl_sfq_set_quantum(struct rtnl_qdisc *qdisc, int quantum) 00155 { 00156 struct rtnl_sfq *sfq; 00157 00158 sfq = sfq_alloc(qdisc); 00159 if (!sfq) 00160 return nl_errno(ENOMEM); 00161 00162 sfq->qs_quantum = quantum; 00163 sfq->qs_mask |= SCH_SFQ_ATTR_QUANTUM; 00164 00165 return 0; 00166 } 00167 00168 /** 00169 * Get quantum of SFQ qdisc. 00170 * @arg qdisc SFQ qdisc. 00171 * @return Quantum in bytes or a negative error code. 00172 */ 00173 int rtnl_sfq_get_quantum(struct rtnl_qdisc *qdisc) 00174 { 00175 struct rtnl_sfq *sfq; 00176 00177 sfq = sfq_qdisc(qdisc); 00178 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_QUANTUM) 00179 return sfq->qs_quantum; 00180 else 00181 return nl_errno(ENOENT); 00182 } 00183 00184 /** 00185 * Set limit of SFQ qdisc. 00186 * @arg qdisc SFQ qdisc to be modified. 00187 * @arg limit New limit in number of packets. 00188 * @return 0 on success or a negative error code. 00189 */ 00190 int rtnl_sfq_set_limit(struct rtnl_qdisc *qdisc, int limit) 00191 { 00192 struct rtnl_sfq *sfq; 00193 00194 sfq = sfq_alloc(qdisc); 00195 if (!sfq) 00196 return nl_errno(ENOMEM); 00197 00198 sfq->qs_limit = limit; 00199 sfq->qs_mask |= SCH_SFQ_ATTR_LIMIT; 00200 00201 return 0; 00202 } 00203 00204 /** 00205 * Get limit of SFQ qdisc. 00206 * @arg qdisc SFQ qdisc. 00207 * @return Limit or a negative error code. 00208 */ 00209 int rtnl_sfq_get_limit(struct rtnl_qdisc *qdisc) 00210 { 00211 struct rtnl_sfq *sfq; 00212 00213 sfq = sfq_qdisc(qdisc); 00214 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_LIMIT) 00215 return sfq->qs_limit; 00216 else 00217 return nl_errno(ENOENT); 00218 } 00219 00220 /** 00221 * Set perturbation interval of SFQ qdisc. 00222 * @arg qdisc SFQ qdisc to be modified. 00223 * @arg perturb New perturbation interval in seconds. 00224 * @note A value of 0 disables perturbation altogether. 00225 * @return 0 on success or a negative error code. 00226 */ 00227 int rtnl_sfq_set_perturb(struct rtnl_qdisc *qdisc, int perturb) 00228 { 00229 struct rtnl_sfq *sfq; 00230 00231 sfq = sfq_alloc(qdisc); 00232 if (!sfq) 00233 return nl_errno(ENOMEM); 00234 00235 sfq->qs_perturb = perturb; 00236 sfq->qs_mask |= SCH_SFQ_ATTR_PERTURB; 00237 00238 return 0; 00239 } 00240 00241 /** 00242 * Get perturbation interval of SFQ qdisc. 00243 * @arg qdisc SFQ qdisc. 00244 * @return Perturbation interval in seconds or a negative error code. 00245 */ 00246 int rtnl_sfq_get_perturb(struct rtnl_qdisc *qdisc) 00247 { 00248 struct rtnl_sfq *sfq; 00249 00250 sfq = sfq_qdisc(qdisc); 00251 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_PERTURB) 00252 return sfq->qs_perturb; 00253 else 00254 return nl_errno(ENOENT); 00255 } 00256 00257 /** 00258 * Get divisor of SFQ qdisc. 00259 * @arg qdisc SFQ qdisc. 00260 * @return Divisor in number of entries or a negative error code. 00261 */ 00262 int rtnl_sfq_get_divisor(struct rtnl_qdisc *qdisc) 00263 { 00264 struct rtnl_sfq *sfq; 00265 00266 sfq = sfq_qdisc(qdisc); 00267 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_DIVISOR) 00268 return sfq->qs_divisor; 00269 else 00270 return nl_errno(ENOENT); 00271 } 00272 00273 /** @} */ 00274 00275 static struct rtnl_qdisc_ops sfq_ops = { 00276 .qo_kind = "sfq", 00277 .qo_msg_parser = sfq_msg_parser, 00278 .qo_free_data = sfq_free_data, 00279 .qo_dump[NL_DUMP_BRIEF] = sfq_dump_brief, 00280 .qo_dump[NL_DUMP_FULL] = sfq_dump_full, 00281 .qo_get_opts = sfq_get_opts, 00282 }; 00283 00284 static void __init sfq_init(void) 00285 { 00286 rtnl_qdisc_register(&sfq_ops); 00287 } 00288 00289 static void __exit sfq_exit(void) 00290 { 00291 rtnl_qdisc_unregister(&sfq_ops); 00292 } 00293 00294 /** @} */