+/*
+ * lib/route/sch/sfq.c SFQ Qdisc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
+ */
+
+/**
+ * @ingroup qdisc
+ * @defgroup sfq Stochastic Fairness Queueing (SFQ)
+ * @brief
+ *
+ * @par Parameter Description
+ * - \b Quantum: Number of bytes to send out per slot and round.
+ * - \b Perturbation: Timer period between changing the hash function.
+ * - \b Limit: Upper limit of queue in number of packets before SFQ starts
+ * dropping packets.
+ * - \b Divisor: Hash table divisor, i.e. size of hash table.
+ * @{
+ */
+
+#include <netlink-local.h>
+#include <netlink-tc.h>
+#include <netlink/netlink.h>
+#include <netlink/utils.h>
+#include <netlink/route/qdisc.h>
+#include <netlink/route/qdisc-modules.h>
+#include <netlink/route/sch/sfq.h>
+
+/** @cond SKIP */
+#define SCH_SFQ_ATTR_QUANTUM 0x01
+#define SCH_SFQ_ATTR_PERTURB 0x02
+#define SCH_SFQ_ATTR_LIMIT 0x04
+#define SCH_SFQ_ATTR_DIVISOR 0x08
+#define SCH_SFQ_ATTR_FLOWS 0x10
+/** @endcond */
+
+static inline struct rtnl_sfq *sfq_qdisc(struct rtnl_qdisc *qdisc)
+{
+ return (struct rtnl_sfq *) qdisc->q_subdata;
+}
+
+static inline struct rtnl_sfq *sfq_alloc(struct rtnl_qdisc *qdisc)
+{
+ if (!qdisc->q_subdata)
+ qdisc->q_subdata = calloc(1, sizeof(struct rtnl_sfq));
+
+ return sfq_qdisc(qdisc);
+}
+
+static int sfq_msg_parser(struct rtnl_qdisc *qdisc)
+{
+ struct rtnl_sfq *sfq;
+ struct tc_sfq_qopt *opts;
+
+ if (!(qdisc->q_mask & TCA_ATTR_OPTS))
+ return 0;
+
+ if (qdisc->q_opts->d_size < sizeof(*opts))
+ return nl_error(EINVAL, "SFQ specific options size mismatch");
+
+ sfq = sfq_alloc(qdisc);
+ if (!sfq)
+ return nl_errno(ENOMEM);
+
+ opts = (struct tc_sfq_qopt *) qdisc->q_opts->d_data;
+
+ sfq->qs_quantum = opts->quantum;
+ sfq->qs_perturb = opts->perturb_period;
+ sfq->qs_limit = opts->limit;
+ sfq->qs_divisor = opts->divisor;
+ sfq->qs_flows = opts->flows;
+
+ sfq->qs_mask = (SCH_SFQ_ATTR_QUANTUM | SCH_SFQ_ATTR_PERTURB |
+ SCH_SFQ_ATTR_LIMIT | SCH_SFQ_ATTR_DIVISOR |
+ SCH_SFQ_ATTR_FLOWS);
+
+ return 0;
+}
+
+static void sfq_free_data(struct rtnl_qdisc *qdisc)
+{
+ free(qdisc->q_subdata);
+}
+
+static int sfq_dump_brief(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
+ int line)
+{
+ struct rtnl_sfq *sfq = sfq_qdisc(qdisc);
+
+ if (sfq)
+ dp_dump(p, " quantum %u perturb %us",
+ sfq->qs_quantum,
+ nl_ticks2us(sfq->qs_perturb * nl_get_hz()));
+
+ return line;
+}
+
+static int sfq_dump_full(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
+ int line)
+{
+ struct rtnl_sfq *sfq = sfq_qdisc(qdisc);
+
+ if (sfq)
+ dp_dump(p, "limit %u divisor %u",
+ sfq->qs_limit, sfq->qs_divisor);
+
+ return line;
+}
+
+static struct nl_msg *sfq_get_opts(struct rtnl_qdisc *qdisc)
+{
+ struct rtnl_sfq *sfq;
+ struct tc_sfq_qopt opts;
+ struct nl_msg *msg;
+
+ sfq = sfq_qdisc(qdisc);
+ if (!sfq)
+ return NULL;
+
+ msg = nlmsg_build_no_hdr();
+ if (!msg)
+ goto errout;
+
+ memset(&opts, 0, sizeof(opts));
+ opts.quantum = sfq->qs_quantum;
+ opts.perturb_period = sfq->qs_perturb;
+ opts.limit = sfq->qs_limit;
+
+ if (nlmsg_append(msg, &opts, sizeof(opts), 0) < 0)
+ goto errout;
+
+ return msg;
+errout:
+ nlmsg_free(msg);
+ return NULL;
+}
+
+/**
+ * @name Attribute Access
+ * @{
+ */
+
+/**
+ * Set quantum of SFQ qdisc.
+ * @arg qdisc SFQ qdisc to be modified.
+ * @arg quantum New quantum in bytes.
+ * @return 0 on success or a negative error code.
+ */
+int rtnl_sfq_set_quantum(struct rtnl_qdisc *qdisc, int quantum)
+{
+ struct rtnl_sfq *sfq;
+
+ sfq = sfq_alloc(qdisc);
+ if (!sfq)
+ return nl_errno(ENOMEM);
+
+ sfq->qs_quantum = quantum;
+ sfq->qs_mask |= SCH_SFQ_ATTR_QUANTUM;
+
+ return 0;
+}
+
+/**
+ * Get quantum of SFQ qdisc.
+ * @arg qdisc SFQ qdisc.
+ * @return Quantum in bytes or a negative error code.
+ */
+int rtnl_sfq_get_quantum(struct rtnl_qdisc *qdisc)
+{
+ struct rtnl_sfq *sfq;
+
+ sfq = sfq_qdisc(qdisc);
+ if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_QUANTUM)
+ return sfq->qs_quantum;
+ else
+ return nl_errno(ENOENT);
+}
+
+/**
+ * Set limit of SFQ qdisc.
+ * @arg qdisc SFQ qdisc to be modified.
+ * @arg limit New limit in number of packets.
+ * @return 0 on success or a negative error code.
+ */
+int rtnl_sfq_set_limit(struct rtnl_qdisc *qdisc, int limit)
+{
+ struct rtnl_sfq *sfq;
+
+ sfq = sfq_alloc(qdisc);
+ if (!sfq)
+ return nl_errno(ENOMEM);
+
+ sfq->qs_limit = limit;
+ sfq->qs_mask |= SCH_SFQ_ATTR_LIMIT;
+
+ return 0;
+}
+
+/**
+ * Get limit of SFQ qdisc.
+ * @arg qdisc SFQ qdisc.
+ * @return Limit or a negative error code.
+ */
+int rtnl_sfq_get_limit(struct rtnl_qdisc *qdisc)
+{
+ struct rtnl_sfq *sfq;
+
+ sfq = sfq_qdisc(qdisc);
+ if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_LIMIT)
+ return sfq->qs_limit;
+ else
+ return nl_errno(ENOENT);
+}
+
+/**
+ * Set perturbation interval of SFQ qdisc.
+ * @arg qdisc SFQ qdisc to be modified.
+ * @arg perturb New perturbation interval in seconds.
+ * @note A value of 0 disables perturbation altogether.
+ * @return 0 on success or a negative error code.
+ */
+int rtnl_sfq_set_perturb(struct rtnl_qdisc *qdisc, int perturb)
+{
+ struct rtnl_sfq *sfq;
+
+ sfq = sfq_alloc(qdisc);
+ if (!sfq)
+ return nl_errno(ENOMEM);
+
+ sfq->qs_perturb = perturb;
+ sfq->qs_mask |= SCH_SFQ_ATTR_PERTURB;
+
+ return 0;
+}
+
+/**
+ * Get perturbation interval of SFQ qdisc.
+ * @arg qdisc SFQ qdisc.
+ * @return Perturbation interval in seconds or a negative error code.
+ */
+int rtnl_sfq_get_perturb(struct rtnl_qdisc *qdisc)
+{
+ struct rtnl_sfq *sfq;
+
+ sfq = sfq_qdisc(qdisc);
+ if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_PERTURB)
+ return sfq->qs_perturb;
+ else
+ return nl_errno(ENOENT);
+}
+
+/**
+ * Get divisor of SFQ qdisc.
+ * @arg qdisc SFQ qdisc.
+ * @return Divisor in number of entries or a negative error code.
+ */
+int rtnl_sfq_get_divisor(struct rtnl_qdisc *qdisc)
+{
+ struct rtnl_sfq *sfq;
+
+ sfq = sfq_qdisc(qdisc);
+ if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_DIVISOR)
+ return sfq->qs_divisor;
+ else
+ return nl_errno(ENOENT);
+}
+
+/** @} */
+
+static struct rtnl_qdisc_ops sfq_ops = {
+ .qo_kind = "sfq",
+ .qo_msg_parser = sfq_msg_parser,
+ .qo_free_data = sfq_free_data,
+ .qo_dump[NL_DUMP_BRIEF] = sfq_dump_brief,
+ .qo_dump[NL_DUMP_FULL] = sfq_dump_full,
+ .qo_get_opts = sfq_get_opts,
+};
+
+static void __init sfq_init(void)
+{
+ rtnl_qdisc_register(&sfq_ops);
+}
+
+static void __exit sfq_exit(void)
+{
+ rtnl_qdisc_unregister(&sfq_ops);
+}
+
+/** @} */
git://git.onelab.eu / libnl.git / blobdiff