libnl 2.0
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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) 2003-2008 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 -NLE_INVAL; 00065 00066 sfq = sfq_alloc(qdisc); 00067 if (!sfq) 00068 return -NLE_NOMEM; 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 void sfq_dump_line(struct rtnl_qdisc *qdisc, struct nl_dump_params *p) 00091 { 00092 struct rtnl_sfq *sfq = sfq_qdisc(qdisc); 00093 00094 if (sfq) 00095 nl_dump(p, " quantum %u perturb %us", sfq->qs_quantum, 00096 nl_ticks2us(sfq->qs_perturb * nl_get_hz())); 00097 } 00098 00099 static void sfq_dump_details(struct rtnl_qdisc *qdisc, struct nl_dump_params *p) 00100 { 00101 struct rtnl_sfq *sfq = sfq_qdisc(qdisc); 00102 00103 if (sfq) 00104 nl_dump(p, "limit %u divisor %u", 00105 sfq->qs_limit, sfq->qs_divisor); 00106 } 00107 00108 static struct nl_msg *sfq_get_opts(struct rtnl_qdisc *qdisc) 00109 { 00110 struct rtnl_sfq *sfq; 00111 struct tc_sfq_qopt opts; 00112 struct nl_msg *msg; 00113 00114 sfq = sfq_qdisc(qdisc); 00115 if (!sfq) 00116 return NULL; 00117 00118 msg = nlmsg_alloc(); 00119 if (!msg) 00120 goto errout; 00121 00122 memset(&opts, 0, sizeof(opts)); 00123 opts.quantum = sfq->qs_quantum; 00124 opts.perturb_period = sfq->qs_perturb; 00125 opts.limit = sfq->qs_limit; 00126 00127 if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0) 00128 goto errout; 00129 00130 return msg; 00131 errout: 00132 nlmsg_free(msg); 00133 return NULL; 00134 } 00135 00136 /** 00137 * @name Attribute Access 00138 * @{ 00139 */ 00140 00141 /** 00142 * Set quantum of SFQ qdisc. 00143 * @arg qdisc SFQ qdisc to be modified. 00144 * @arg quantum New quantum in bytes. 00145 * @return 0 on success or a negative error code. 00146 */ 00147 int rtnl_sfq_set_quantum(struct rtnl_qdisc *qdisc, int quantum) 00148 { 00149 struct rtnl_sfq *sfq; 00150 00151 sfq = sfq_alloc(qdisc); 00152 if (!sfq) 00153 return -NLE_NOMEM; 00154 00155 sfq->qs_quantum = quantum; 00156 sfq->qs_mask |= SCH_SFQ_ATTR_QUANTUM; 00157 00158 return 0; 00159 } 00160 00161 /** 00162 * Get quantum of SFQ qdisc. 00163 * @arg qdisc SFQ qdisc. 00164 * @return Quantum in bytes or a negative error code. 00165 */ 00166 int rtnl_sfq_get_quantum(struct rtnl_qdisc *qdisc) 00167 { 00168 struct rtnl_sfq *sfq; 00169 00170 sfq = sfq_qdisc(qdisc); 00171 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_QUANTUM) 00172 return sfq->qs_quantum; 00173 else 00174 return -NLE_NOATTR; 00175 } 00176 00177 /** 00178 * Set limit of SFQ qdisc. 00179 * @arg qdisc SFQ qdisc to be modified. 00180 * @arg limit New limit in number of packets. 00181 * @return 0 on success or a negative error code. 00182 */ 00183 int rtnl_sfq_set_limit(struct rtnl_qdisc *qdisc, int limit) 00184 { 00185 struct rtnl_sfq *sfq; 00186 00187 sfq = sfq_alloc(qdisc); 00188 if (!sfq) 00189 return -NLE_NOMEM; 00190 00191 sfq->qs_limit = limit; 00192 sfq->qs_mask |= SCH_SFQ_ATTR_LIMIT; 00193 00194 return 0; 00195 } 00196 00197 /** 00198 * Get limit of SFQ qdisc. 00199 * @arg qdisc SFQ qdisc. 00200 * @return Limit or a negative error code. 00201 */ 00202 int rtnl_sfq_get_limit(struct rtnl_qdisc *qdisc) 00203 { 00204 struct rtnl_sfq *sfq; 00205 00206 sfq = sfq_qdisc(qdisc); 00207 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_LIMIT) 00208 return sfq->qs_limit; 00209 else 00210 return -NLE_NOATTR; 00211 } 00212 00213 /** 00214 * Set perturbation interval of SFQ qdisc. 00215 * @arg qdisc SFQ qdisc to be modified. 00216 * @arg perturb New perturbation interval in seconds. 00217 * @note A value of 0 disables perturbation altogether. 00218 * @return 0 on success or a negative error code. 00219 */ 00220 int rtnl_sfq_set_perturb(struct rtnl_qdisc *qdisc, int perturb) 00221 { 00222 struct rtnl_sfq *sfq; 00223 00224 sfq = sfq_alloc(qdisc); 00225 if (!sfq) 00226 return -NLE_NOMEM; 00227 00228 sfq->qs_perturb = perturb; 00229 sfq->qs_mask |= SCH_SFQ_ATTR_PERTURB; 00230 00231 return 0; 00232 } 00233 00234 /** 00235 * Get perturbation interval of SFQ qdisc. 00236 * @arg qdisc SFQ qdisc. 00237 * @return Perturbation interval in seconds or a negative error code. 00238 */ 00239 int rtnl_sfq_get_perturb(struct rtnl_qdisc *qdisc) 00240 { 00241 struct rtnl_sfq *sfq; 00242 00243 sfq = sfq_qdisc(qdisc); 00244 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_PERTURB) 00245 return sfq->qs_perturb; 00246 else 00247 return -NLE_NOATTR; 00248 } 00249 00250 /** 00251 * Get divisor of SFQ qdisc. 00252 * @arg qdisc SFQ qdisc. 00253 * @return Divisor in number of entries or a negative error code. 00254 */ 00255 int rtnl_sfq_get_divisor(struct rtnl_qdisc *qdisc) 00256 { 00257 struct rtnl_sfq *sfq; 00258 00259 sfq = sfq_qdisc(qdisc); 00260 if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_DIVISOR) 00261 return sfq->qs_divisor; 00262 else 00263 return -NLE_NOATTR; 00264 } 00265 00266 /** @} */ 00267 00268 static struct rtnl_qdisc_ops sfq_ops = { 00269 .qo_kind = "sfq", 00270 .qo_msg_parser = sfq_msg_parser, 00271 .qo_free_data = sfq_free_data, 00272 .qo_dump = { 00273 [NL_DUMP_LINE] = sfq_dump_line, 00274 [NL_DUMP_DETAILS] = sfq_dump_details, 00275 }, 00276 .qo_get_opts = sfq_get_opts, 00277 }; 00278 00279 static void __init sfq_init(void) 00280 { 00281 rtnl_qdisc_register(&sfq_ops); 00282 } 00283 00284 static void __exit sfq_exit(void) 00285 { 00286 rtnl_qdisc_unregister(&sfq_ops); 00287 } 00288 00289 /** @} */