165 lines
4.4 KiB
C
165 lines
4.4 KiB
C
/* $OpenBSD: ieee80211_amrr.c,v 1.1 2006/06/17 19:07:19 damien Exp $ */
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/*-
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* Copyright (c) 2006
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* Damien Bergamini <damien.bergamini@free.fr>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*-
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* Naive implementation of the Adaptive Multi Rate Retry algorithm:
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*
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* "IEEE 802.11 Rate Adaptation: A Practical Approach"
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* Mathieu Lacage, Hossein Manshaei, Thierry Turletti
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* INRIA Sophia - Projet Planete
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* http://www-sop.inria.fr/rapports/sophia/RR-5208.html
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_media.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#endif
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#include <net80211/ieee80211.h>
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_amrr.h>
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#define is_success(amn) \
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((amn)->amn_retrycnt < (amn)->amn_txcnt / 10)
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#define is_failure(amn) \
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((amn)->amn_retrycnt > (amn)->amn_txcnt / 3)
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#define is_enough(amn) \
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((amn)->amn_txcnt > 10)
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#define is_min_rate(ni) \
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((ni)->ni_txrate == 0)
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#define is_max_rate(ni) \
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((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1)
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#define increase_rate(ni) \
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((ni)->ni_txrate++)
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#define decrease_rate(ni) \
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((ni)->ni_txrate--)
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#define reset_cnt(amn) \
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do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0)
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void
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ieee80211_amrr_init(struct ieee80211_amrr *amrr,
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struct ieee80211com *ic, int min, int max)
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{
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/* XXX bounds check? */
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amrr->amrr_min_success_threshold = min;
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amrr->amrr_max_success_threshold = max;
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amrr->amrr_ic = ic;
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}
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void
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ieee80211_amrr_node_init(struct ieee80211_amrr *amrr,
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struct ieee80211_amrr_node *amn)
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{
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amn->amn_success = 0;
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amn->amn_recovery = 0;
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amn->amn_txcnt = amn->amn_retrycnt = 0;
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amn->amn_success_threshold = amrr->amrr_min_success_threshold;
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}
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/*
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* Update ni->ni_txrate.
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*/
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void
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ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni,
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struct ieee80211_amrr_node *amn)
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{
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int need_change = 0;
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if (is_success(amn) && is_enough(amn)) {
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amn->amn_success++;
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if (amn->amn_success >= amn->amn_success_threshold &&
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!is_max_rate(ni)) {
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amn->amn_recovery = 1;
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amn->amn_success = 0;
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increase_rate(ni);
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IEEE80211_DPRINTF(amrr->amrr_ic, IEEE80211_MSG_RATECTL,
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"AMRR increasing rate %d (txcnt=%d "
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"retrycnt=%d)\n",
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ni->ni_rates.rs_rates[ni->ni_txrate] &
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IEEE80211_RATE_VAL,
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amn->amn_txcnt, amn->amn_retrycnt);
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need_change = 1;
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} else {
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amn->amn_recovery = 0;
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}
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} else if (is_failure(amn)) {
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amn->amn_success = 0;
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if (!is_min_rate(ni)) {
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if (amn->amn_recovery) {
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amn->amn_success_threshold *= 2;
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if (amn->amn_success_threshold >
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amrr->amrr_max_success_threshold)
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amn->amn_success_threshold =
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amrr->amrr_max_success_threshold;
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} else {
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amn->amn_success_threshold =
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amrr->amrr_min_success_threshold;
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}
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decrease_rate(ni);
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IEEE80211_DPRINTF(amrr->amrr_ic, IEEE80211_MSG_RATECTL,
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"AMRR decreasing rate %d (txcnt=%d "
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"retrycnt=%d)\n",
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ni->ni_rates.rs_rates[ni->ni_txrate] &
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IEEE80211_RATE_VAL,
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amn->amn_txcnt, amn->amn_retrycnt);
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need_change = 1;
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}
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amn->amn_recovery = 0;
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}
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if (is_enough(amn) || need_change)
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reset_cnt(amn);
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}
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/*
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* Module glue.
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*/
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static int
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amrr_modevent(module_t mod, int type, void *unused)
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{
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switch (type) {
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case MOD_LOAD:
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if (bootverbose)
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printf("wlan_amrr: <AMRR Transmit Rate Control Algorithm>\n");
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return 0;
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case MOD_UNLOAD:
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return 0;
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}
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return EINVAL;
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}
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static moduledata_t amrr_mod = {
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"wlan_amrr",
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amrr_modevent,
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0
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};
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DECLARE_MODULE(wlan_amrr, amrr_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
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MODULE_VERSION(wlan_amrr, 1);
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