318 lines
9.1 KiB
C
318 lines
9.1 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) 2010 Rui Paulo <rpaulo@FreeBSD.org>
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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 "opt_wlan.h"
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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_var.h>
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#include <net80211/ieee80211_amrr.h>
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#include <net80211/ieee80211_ratectl.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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static void amrr_setinterval(const struct ieee80211vap *, int);
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static void amrr_init(struct ieee80211vap *);
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static void amrr_deinit(struct ieee80211vap *);
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static void amrr_node_init(struct ieee80211_node *);
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static void amrr_node_deinit(struct ieee80211_node *);
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static int amrr_update(struct ieee80211_amrr *,
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struct ieee80211_amrr_node *, struct ieee80211_node *);
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static int amrr_rate(struct ieee80211_node *, void *, uint32_t);
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static void amrr_tx_complete(const struct ieee80211vap *,
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const struct ieee80211_node *, int,
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void *, void *);
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static void amrr_tx_update(const struct ieee80211vap *vap,
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const struct ieee80211_node *, void *, void *, void *);
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static void amrr_sysctlattach(struct ieee80211vap *,
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struct sysctl_ctx_list *, struct sysctl_oid *);
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/* number of references from net80211 layer */
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static int nrefs = 0;
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static const struct ieee80211_ratectl amrr = {
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.ir_name = "amrr",
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.ir_attach = NULL,
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.ir_detach = NULL,
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.ir_init = amrr_init,
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.ir_deinit = amrr_deinit,
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.ir_node_init = amrr_node_init,
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.ir_node_deinit = amrr_node_deinit,
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.ir_rate = amrr_rate,
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.ir_tx_complete = amrr_tx_complete,
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.ir_tx_update = amrr_tx_update,
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.ir_setinterval = amrr_setinterval,
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};
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IEEE80211_RATECTL_MODULE(amrr, 1);
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IEEE80211_RATECTL_ALG(amrr, IEEE80211_RATECTL_AMRR, amrr);
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static void
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amrr_setinterval(const struct ieee80211vap *vap, int msecs)
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{
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struct ieee80211_amrr *amrr = vap->iv_rs;
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int t;
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if (msecs < 100)
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msecs = 100;
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t = msecs_to_ticks(msecs);
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amrr->amrr_interval = (t < 1) ? 1 : t;
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}
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static void
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amrr_init(struct ieee80211vap *vap)
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{
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struct ieee80211_amrr *amrr;
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KASSERT(vap->iv_rs == NULL, ("%s called multiple times", __func__));
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amrr = vap->iv_rs = malloc(sizeof(struct ieee80211_amrr),
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M_80211_RATECTL, M_NOWAIT|M_ZERO);
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if (amrr == NULL) {
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if_printf(vap->iv_ifp, "couldn't alloc ratectl structure\n");
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return;
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}
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amrr->amrr_min_success_threshold = IEEE80211_AMRR_MIN_SUCCESS_THRESHOLD;
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amrr->amrr_max_success_threshold = IEEE80211_AMRR_MAX_SUCCESS_THRESHOLD;
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amrr_setinterval(vap, 500 /* ms */);
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amrr_sysctlattach(vap, vap->iv_sysctl, vap->iv_oid);
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}
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static void
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amrr_deinit(struct ieee80211vap *vap)
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{
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free(vap->iv_rs, M_80211_RATECTL);
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}
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static void
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amrr_node_init(struct ieee80211_node *ni)
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{
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const struct ieee80211_rateset *rs = &ni->ni_rates;
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211_amrr *amrr = vap->iv_rs;
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struct ieee80211_amrr_node *amn;
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KASSERT(ni->ni_rctls == NULL, ("%s: ni_rctls already initialized",
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__func__));
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ni->ni_rctls = amn = malloc(sizeof(struct ieee80211_amrr_node),
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M_80211_RATECTL, M_NOWAIT|M_ZERO);
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if (amn == NULL) {
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if_printf(vap->iv_ifp, "couldn't alloc per-node ratectl "
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"structure\n");
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return;
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}
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amn->amn_amrr = amrr;
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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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/* pick initial rate */
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for (amn->amn_rix = rs->rs_nrates - 1;
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amn->amn_rix > 0 && (rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL) > 72;
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amn->amn_rix--)
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;
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ni->ni_txrate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
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amn->amn_ticks = ticks;
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IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
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"AMRR initial rate %d", ni->ni_txrate);
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}
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static void
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amrr_node_deinit(struct ieee80211_node *ni)
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{
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free(ni->ni_rctls, M_80211_RATECTL);
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}
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static int
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amrr_update(struct ieee80211_amrr *amrr, struct ieee80211_amrr_node *amn,
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struct ieee80211_node *ni)
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{
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int rix = amn->amn_rix;
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KASSERT(is_enough(amn), ("txcnt %d", amn->amn_txcnt));
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if (is_success(amn)) {
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amn->amn_success++;
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if (amn->amn_success >= amn->amn_success_threshold &&
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rix + 1 < ni->ni_rates.rs_nrates) {
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amn->amn_recovery = 1;
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amn->amn_success = 0;
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rix++;
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IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
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"AMRR increasing rate %d (txcnt=%d retrycnt=%d)",
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ni->ni_rates.rs_rates[rix] & IEEE80211_RATE_VAL,
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amn->amn_txcnt, amn->amn_retrycnt);
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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 (rix > 0) {
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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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rix--;
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IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
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"AMRR decreasing rate %d (txcnt=%d retrycnt=%d)",
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ni->ni_rates.rs_rates[rix] & IEEE80211_RATE_VAL,
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amn->amn_txcnt, amn->amn_retrycnt);
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}
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amn->amn_recovery = 0;
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}
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/* reset counters */
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amn->amn_txcnt = 0;
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amn->amn_retrycnt = 0;
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return rix;
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}
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/*
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* Return the rate index to use in sending a data frame.
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* Update our internal state if it's been long enough.
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* If the rate changes we also update ni_txrate to match.
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*/
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static int
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amrr_rate(struct ieee80211_node *ni, void *arg __unused, uint32_t iarg __unused)
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{
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struct ieee80211_amrr_node *amn = ni->ni_rctls;
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struct ieee80211_amrr *amrr = amn->amn_amrr;
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int rix;
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if (is_enough(amn) && (ticks - amn->amn_ticks) > amrr->amrr_interval) {
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rix = amrr_update(amrr, amn, ni);
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if (rix != amn->amn_rix) {
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/* update public rate */
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ni->ni_txrate =
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ni->ni_rates.rs_rates[rix] & IEEE80211_RATE_VAL;
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amn->amn_rix = rix;
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}
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amn->amn_ticks = ticks;
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} else
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rix = amn->amn_rix;
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return rix;
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}
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/*
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* Update statistics with tx complete status. Ok is non-zero
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* if the packet is known to be ACK'd. Retries has the number
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* retransmissions (i.e. xmit attempts - 1).
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*/
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static void
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amrr_tx_complete(const struct ieee80211vap *vap,
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const struct ieee80211_node *ni, int ok,
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void *arg1, void *arg2 __unused)
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{
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struct ieee80211_amrr_node *amn = ni->ni_rctls;
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int retries = *(int *)arg1;
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amn->amn_txcnt++;
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if (ok)
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amn->amn_success++;
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amn->amn_retrycnt += retries;
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}
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/*
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* Set tx count/retry statistics explicitly. Intended for
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* drivers that poll the device for statistics maintained
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* in the device.
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*/
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static void
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amrr_tx_update(const struct ieee80211vap *vap, const struct ieee80211_node *ni,
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void *arg1, void *arg2, void *arg3)
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{
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struct ieee80211_amrr_node *amn = ni->ni_rctls;
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int txcnt = *(int *)arg1, success = *(int *)arg2, retrycnt = *(int *)arg3;
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amn->amn_txcnt = txcnt;
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amn->amn_success = success;
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amn->amn_retrycnt = retrycnt;
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}
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static int
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amrr_sysctl_interval(SYSCTL_HANDLER_ARGS)
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{
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struct ieee80211vap *vap = arg1;
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struct ieee80211_amrr *amrr = vap->iv_rs;
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int msecs = ticks_to_msecs(amrr->amrr_interval);
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int error;
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error = sysctl_handle_int(oidp, &msecs, 0, req);
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if (error || !req->newptr)
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return error;
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amrr_setinterval(vap, msecs);
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return 0;
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}
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static void
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amrr_sysctlattach(struct ieee80211vap *vap,
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struct sysctl_ctx_list *ctx, struct sysctl_oid *tree)
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{
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struct ieee80211_amrr *amrr = vap->iv_rs;
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"amrr_rate_interval", CTLTYPE_INT | CTLFLAG_RW, vap,
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0, amrr_sysctl_interval, "I", "amrr operation interval (ms)");
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/* XXX bounds check values */
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SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"amrr_max_sucess_threshold", CTLFLAG_RW,
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&amrr->amrr_max_success_threshold, 0, "");
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SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"amrr_min_sucess_threshold", CTLFLAG_RW,
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&amrr->amrr_min_success_threshold, 0, "");
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}
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