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* lib/route/qdisc/red.c RED Qdisc
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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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* Copyright (c) 2003-2011 Thomas Graf <tgraf@suug.ch>
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* @defgroup qdisc_red Random Early Detection (RED)
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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/tc-api.h>
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#include <netlink/route/qdisc.h>
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#include <netlink/route/qdisc/red.h>
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#define RED_ATTR_LIMIT 0x01
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#define RED_ATTR_QTH_MIN 0x02
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#define RED_ATTR_QTH_MAX 0x04
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#define RED_ATTR_FLAGS 0x08
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#define RED_ATTR_WLOG 0x10
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#define RED_ATTR_PLOG 0x20
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#define RED_ATTR_SCELL_LOG 0x40
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static struct nla_policy red_policy[TCA_RED_MAX+1] = {
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[TCA_RED_PARMS] = { .minlen = sizeof(struct tc_red_qopt) },
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static int red_msg_parser(struct rtnl_tc *tc, void *data)
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struct nlattr *tb[TCA_RED_MAX+1];
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struct rtnl_red *red = data;
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struct tc_red_qopt *opts;
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if (!(tc->ce_mask & TCA_ATTR_OPTS))
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err = tca_parse(tb, TCA_RED_MAX, tc, red_policy);
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if (!tb[TCA_RED_PARMS])
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return -NLE_MISSING_ATTR;
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opts = nla_data(tb[TCA_RED_PARMS]);
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red->qr_limit = opts->limit;
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red->qr_qth_min = opts->qth_min;
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red->qr_qth_max = opts->qth_max;
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red->qr_flags = opts->flags;
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red->qr_wlog = opts->Wlog;
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red->qr_plog = opts->Plog;
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red->qr_scell_log = opts->Scell_log;
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red->qr_mask = (RED_ATTR_LIMIT | RED_ATTR_QTH_MIN | RED_ATTR_QTH_MAX |
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RED_ATTR_FLAGS | RED_ATTR_WLOG | RED_ATTR_PLOG |
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static void red_dump_line(struct rtnl_tc *tc, void *data,
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struct nl_dump_params *p)
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struct rtnl_red *red = data;
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/* XXX: limit, min, max, flags */
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static void red_dump_details(struct rtnl_tc *tc, void *data,
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struct nl_dump_params *p)
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struct rtnl_red *red = data;
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/* XXX: wlog, plog, scell_log */
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static void red_dump_stats(struct rtnl_tc *tc, void *data,
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struct nl_dump_params *p)
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struct rtnl_red *red = data;
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static int red_msg_fill(struct rtnl_tc *tc, void *data, struct nl_msg *msg)
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struct rtnl_red *red = data;
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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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return -NLE_OPNOTSUPP;
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* @name Attribute Access
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* Set limit of RED qdisc.
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* @arg qdisc RED 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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void rtnl_red_set_limit(struct rtnl_qdisc *qdisc, int limit)
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struct rtnl_red *red;
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if (!(red = rtnl_tc_data(TC_CAST(qdisc))))
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red->qr_limit = limit;
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red->qr_mask |= RED_ATTR_LIMIT;
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* Get limit of RED qdisc.
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* @arg qdisc RED qdisc.
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* @return Limit or a negative error code.
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int rtnl_red_get_limit(struct rtnl_qdisc *qdisc)
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struct rtnl_red *red;
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if (!(red = rtnl_tc_data(TC_CAST(qdisc))))
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if (red->qr_mask & RED_ATTR_LIMIT)
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return red->qr_limit;
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static struct rtnl_tc_ops red_ops = {
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.to_type = RTNL_TC_TYPE_QDISC,
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.to_size = sizeof(struct rtnl_red),
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.to_msg_parser = red_msg_parser,
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[NL_DUMP_LINE] = red_dump_line,
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[NL_DUMP_DETAILS] = red_dump_details,
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[NL_DUMP_STATS] = red_dump_stats,
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.to_msg_fill = red_msg_fill,
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static void __init red_init(void)
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rtnl_tc_register(&red_ops);
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static void __exit red_exit(void)
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rtnl_tc_unregister(&red_ops);