8a3efffa5b
In order for the interface to become more thread safe, the error
handling was revised to no longer depend on a static errno and
error string buffer.
This patch converts all error paths to return a libnl specific
error code which can be translated to a error message using
nl_geterror(int error). The functions nl_error() and
nl_get_errno() are therefore obsolete.
This change required various sets of function prototypes to be
changed in order to return an error code, the most prominent
are:
struct nl_cache *foo_alloc_cache(...);
changed to:
int foo_alloc_cache(..., struct nl_cache **);
struct nl_msg *foo_build_request(...);
changed to:
int foo_build_request(..., struct nl_msg **);
struct foo *foo_parse(...);
changed to:
int foo_parse(..., struct foo **);
This pretty much only leaves trivial allocation functions to
still return a pointer object which can still return NULL to
signal out of memory.
This change is a serious API and ABI breaker, sorry!
294 lines
6.1 KiB
C
294 lines
6.1 KiB
C
/*
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* lib/route/sch/sfq.c SFQ Qdisc
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
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*/
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/**
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* @ingroup qdisc_api
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* @defgroup sfq Stochastic Fairness Queueing (SFQ)
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* @brief
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*
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* @par Parameter Description
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* - \b Quantum: Number of bytes to send out per slot and round.
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* - \b Perturbation: Timer period between changing the hash function.
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* - \b Limit: Upper limit of queue in number of packets before SFQ starts
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* dropping packets.
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* - \b Divisor: Hash table divisor, i.e. size of hash table.
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* @{
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*/
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#include <netlink-local.h>
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#include <netlink-tc.h>
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#include <netlink/netlink.h>
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#include <netlink/utils.h>
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#include <netlink/route/qdisc.h>
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#include <netlink/route/qdisc-modules.h>
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#include <netlink/route/sch/sfq.h>
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/** @cond SKIP */
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#define SCH_SFQ_ATTR_QUANTUM 0x01
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#define SCH_SFQ_ATTR_PERTURB 0x02
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#define SCH_SFQ_ATTR_LIMIT 0x04
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#define SCH_SFQ_ATTR_DIVISOR 0x08
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#define SCH_SFQ_ATTR_FLOWS 0x10
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/** @endcond */
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static inline struct rtnl_sfq *sfq_qdisc(struct rtnl_qdisc *qdisc)
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{
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return (struct rtnl_sfq *) qdisc->q_subdata;
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}
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static inline struct rtnl_sfq *sfq_alloc(struct rtnl_qdisc *qdisc)
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{
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if (!qdisc->q_subdata)
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qdisc->q_subdata = calloc(1, sizeof(struct rtnl_sfq));
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return sfq_qdisc(qdisc);
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}
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static int sfq_msg_parser(struct rtnl_qdisc *qdisc)
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{
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struct rtnl_sfq *sfq;
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struct tc_sfq_qopt *opts;
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if (!(qdisc->ce_mask & TCA_ATTR_OPTS))
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return 0;
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if (qdisc->q_opts->d_size < sizeof(*opts))
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return -NLE_INVAL;
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sfq = sfq_alloc(qdisc);
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if (!sfq)
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return -NLE_NOMEM;
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opts = (struct tc_sfq_qopt *) qdisc->q_opts->d_data;
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sfq->qs_quantum = opts->quantum;
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sfq->qs_perturb = opts->perturb_period;
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sfq->qs_limit = opts->limit;
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sfq->qs_divisor = opts->divisor;
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sfq->qs_flows = opts->flows;
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sfq->qs_mask = (SCH_SFQ_ATTR_QUANTUM | SCH_SFQ_ATTR_PERTURB |
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SCH_SFQ_ATTR_LIMIT | SCH_SFQ_ATTR_DIVISOR |
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SCH_SFQ_ATTR_FLOWS);
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return 0;
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}
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static void sfq_free_data(struct rtnl_qdisc *qdisc)
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{
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free(qdisc->q_subdata);
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}
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static int sfq_dump_brief(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
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int line)
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{
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struct rtnl_sfq *sfq = sfq_qdisc(qdisc);
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if (sfq)
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dp_dump(p, " quantum %u perturb %us",
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sfq->qs_quantum,
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nl_ticks2us(sfq->qs_perturb * nl_get_hz()));
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return line;
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}
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static int sfq_dump_full(struct rtnl_qdisc *qdisc, struct nl_dump_params *p,
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int line)
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{
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struct rtnl_sfq *sfq = sfq_qdisc(qdisc);
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if (sfq)
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dp_dump(p, "limit %u divisor %u",
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sfq->qs_limit, sfq->qs_divisor);
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return line;
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}
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static struct nl_msg *sfq_get_opts(struct rtnl_qdisc *qdisc)
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{
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struct rtnl_sfq *sfq;
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struct tc_sfq_qopt opts;
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struct nl_msg *msg;
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sfq = sfq_qdisc(qdisc);
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if (!sfq)
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return NULL;
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msg = nlmsg_alloc();
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if (!msg)
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goto errout;
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memset(&opts, 0, sizeof(opts));
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opts.quantum = sfq->qs_quantum;
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opts.perturb_period = sfq->qs_perturb;
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opts.limit = sfq->qs_limit;
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if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0)
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goto errout;
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return msg;
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errout:
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nlmsg_free(msg);
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return NULL;
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}
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/**
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* @name Attribute Access
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* @{
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*/
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/**
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* Set quantum of SFQ qdisc.
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* @arg qdisc SFQ qdisc to be modified.
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* @arg quantum New quantum in bytes.
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* @return 0 on success or a negative error code.
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*/
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int rtnl_sfq_set_quantum(struct rtnl_qdisc *qdisc, int quantum)
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{
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struct rtnl_sfq *sfq;
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sfq = sfq_alloc(qdisc);
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if (!sfq)
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return -NLE_NOMEM;
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sfq->qs_quantum = quantum;
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sfq->qs_mask |= SCH_SFQ_ATTR_QUANTUM;
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return 0;
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}
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/**
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* Get quantum of SFQ qdisc.
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* @arg qdisc SFQ qdisc.
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* @return Quantum in bytes or a negative error code.
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*/
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int rtnl_sfq_get_quantum(struct rtnl_qdisc *qdisc)
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{
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struct rtnl_sfq *sfq;
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sfq = sfq_qdisc(qdisc);
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if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_QUANTUM)
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return sfq->qs_quantum;
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else
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return -NLE_NOATTR;
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}
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/**
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* Set limit of SFQ qdisc.
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* @arg qdisc SFQ qdisc to be modified.
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* @arg limit New limit in number of packets.
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* @return 0 on success or a negative error code.
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*/
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int rtnl_sfq_set_limit(struct rtnl_qdisc *qdisc, int limit)
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{
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struct rtnl_sfq *sfq;
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sfq = sfq_alloc(qdisc);
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if (!sfq)
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return -NLE_NOMEM;
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sfq->qs_limit = limit;
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sfq->qs_mask |= SCH_SFQ_ATTR_LIMIT;
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return 0;
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}
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/**
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* Get limit of SFQ qdisc.
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* @arg qdisc SFQ qdisc.
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* @return Limit or a negative error code.
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*/
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int rtnl_sfq_get_limit(struct rtnl_qdisc *qdisc)
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{
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struct rtnl_sfq *sfq;
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sfq = sfq_qdisc(qdisc);
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if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_LIMIT)
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return sfq->qs_limit;
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else
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return -NLE_NOATTR;
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}
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/**
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* Set perturbation interval of SFQ qdisc.
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* @arg qdisc SFQ qdisc to be modified.
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* @arg perturb New perturbation interval in seconds.
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* @note A value of 0 disables perturbation altogether.
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* @return 0 on success or a negative error code.
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*/
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int rtnl_sfq_set_perturb(struct rtnl_qdisc *qdisc, int perturb)
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{
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struct rtnl_sfq *sfq;
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sfq = sfq_alloc(qdisc);
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if (!sfq)
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return -NLE_NOMEM;
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sfq->qs_perturb = perturb;
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sfq->qs_mask |= SCH_SFQ_ATTR_PERTURB;
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return 0;
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}
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/**
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* Get perturbation interval of SFQ qdisc.
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* @arg qdisc SFQ qdisc.
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* @return Perturbation interval in seconds or a negative error code.
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*/
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int rtnl_sfq_get_perturb(struct rtnl_qdisc *qdisc)
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{
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struct rtnl_sfq *sfq;
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sfq = sfq_qdisc(qdisc);
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if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_PERTURB)
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return sfq->qs_perturb;
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else
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return -NLE_NOATTR;
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}
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/**
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* Get divisor of SFQ qdisc.
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* @arg qdisc SFQ qdisc.
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* @return Divisor in number of entries or a negative error code.
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*/
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int rtnl_sfq_get_divisor(struct rtnl_qdisc *qdisc)
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{
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struct rtnl_sfq *sfq;
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sfq = sfq_qdisc(qdisc);
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if (sfq && sfq->qs_mask & SCH_SFQ_ATTR_DIVISOR)
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return sfq->qs_divisor;
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else
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return -NLE_NOATTR;
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}
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/** @} */
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static struct rtnl_qdisc_ops sfq_ops = {
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.qo_kind = "sfq",
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.qo_msg_parser = sfq_msg_parser,
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.qo_free_data = sfq_free_data,
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.qo_dump[NL_DUMP_BRIEF] = sfq_dump_brief,
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.qo_dump[NL_DUMP_FULL] = sfq_dump_full,
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.qo_get_opts = sfq_get_opts,
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};
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static void __init sfq_init(void)
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{
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rtnl_qdisc_register(&sfq_ops);
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}
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static void __exit sfq_exit(void)
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{
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rtnl_qdisc_unregister(&sfq_ops);
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}
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/** @} */
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