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/*
* lib/route/qdisc/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) 2003-2011 Thomas Graf <tgraf@suug.ch>
*/
/**
* @ingroup qdisc
* @defgroup qdisc_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/tc-api.h>
#include <netlink/route/qdisc.h>
#include <netlink/route/qdisc/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 int sfq_msg_parser(struct rtnl_tc *tc, void *data)
{
struct rtnl_sfq *sfq = data;
struct tc_sfq_qopt *opts;
if (!(tc->ce_mask & TCA_ATTR_OPTS))
return 0;
if (tc->tc_opts->d_size < sizeof(*opts))
return -NLE_INVAL;
opts = (struct tc_sfq_qopt *) tc->tc_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_dump_line(struct rtnl_tc *tc, void *data,
struct nl_dump_params *p)
{
struct rtnl_sfq *sfq = data;
if (sfq)
nl_dump(p, " quantum %u perturb %us", sfq->qs_quantum,
sfq->qs_perturb);
}
static void sfq_dump_details(struct rtnl_tc *tc, void *data,
struct nl_dump_params *p)
{
struct rtnl_sfq *sfq = data;
if (sfq)
nl_dump(p, "limit %u divisor %u",
sfq->qs_limit, sfq->qs_divisor);
}
static int sfq_msg_fill(struct rtnl_tc *tc, void *data, struct nl_msg *msg)
{
struct rtnl_sfq *sfq = data;
struct tc_sfq_qopt opts = {0};
if (!sfq)
BUG();
opts.quantum = sfq->qs_quantum;
opts.perturb_period = sfq->qs_perturb;
opts.limit = sfq->qs_limit;
return nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD);
}
/**
* @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.
*/
void rtnl_sfq_set_quantum(struct rtnl_qdisc *qdisc, int quantum)
{
struct rtnl_sfq *sfq;
if (!(sfq = rtnl_tc_data(TC_CAST(qdisc))))
BUG();
sfq->qs_quantum = quantum;
sfq->qs_mask |= SCH_SFQ_ATTR_QUANTUM;
}
/**
* 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;
if (!(sfq = rtnl_tc_data(TC_CAST(qdisc))))
BUG();
if (sfq->qs_mask & SCH_SFQ_ATTR_QUANTUM)
return sfq->qs_quantum;
else
return -NLE_NOATTR;
}
/**
* 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.
*/
void rtnl_sfq_set_limit(struct rtnl_qdisc *qdisc, int limit)
{
struct rtnl_sfq *sfq;
if (!(sfq = rtnl_tc_data(TC_CAST(qdisc))))
BUG();
sfq->qs_limit = limit;
sfq->qs_mask |= SCH_SFQ_ATTR_LIMIT;
}
/**
* 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;
if (!(sfq = rtnl_tc_data(TC_CAST(qdisc))))
BUG();
if (sfq->qs_mask & SCH_SFQ_ATTR_LIMIT)
return sfq->qs_limit;
else
return -NLE_NOATTR;
}
/**
* 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.
*/
void rtnl_sfq_set_perturb(struct rtnl_qdisc *qdisc, int perturb)
{
struct rtnl_sfq *sfq;
if (!(sfq = rtnl_tc_data(TC_CAST(qdisc))))
BUG();
sfq->qs_perturb = perturb;
sfq->qs_mask |= SCH_SFQ_ATTR_PERTURB;
}
/**
* 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;
if (!(sfq = rtnl_tc_data(TC_CAST(qdisc))))
BUG();
if (sfq->qs_mask & SCH_SFQ_ATTR_PERTURB)
return sfq->qs_perturb;
else
return -NLE_NOATTR;
}
/**
* 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;
if (!(sfq = rtnl_tc_data(TC_CAST(qdisc))))
BUG();
if (sfq->qs_mask & SCH_SFQ_ATTR_DIVISOR)
return sfq->qs_divisor;
else
return -NLE_NOATTR;
}
/** @} */
static struct rtnl_tc_ops sfq_ops = {
.to_kind = "sfq",
.to_type = RTNL_TC_TYPE_QDISC,
.to_size = sizeof(struct rtnl_sfq),
.to_msg_parser = sfq_msg_parser,
.to_dump = {
[NL_DUMP_LINE] = sfq_dump_line,
[NL_DUMP_DETAILS] = sfq_dump_details,
},
.to_msg_fill = sfq_msg_fill,
};
static void __init sfq_init(void)
{
rtnl_tc_register(&sfq_ops);
}
static void __exit sfq_exit(void)
{
rtnl_tc_unregister(&sfq_ops);
}
/** @} */
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