amrr.c revision 155477
1215976Sjmallett/*- 2232812Sjmallett * Copyright (c) 2004 INRIA 3215976Sjmallett * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 4215976Sjmallett * All rights reserved. 5215976Sjmallett * 6215976Sjmallett * Redistribution and use in source and binary forms, with or without 7215976Sjmallett * modification, are permitted provided that the following conditions 8215976Sjmallett * are met: 9215976Sjmallett * 1. Redistributions of source code must retain the above copyright 10215976Sjmallett * notice, this list of conditions and the following disclaimer, 11215976Sjmallett * without modification. 12215976Sjmallett * 2. Redistributions in binary form must reproduce at minimum a disclaimer 13215976Sjmallett * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 14215976Sjmallett * redistribution must be conditioned upon including a substantially 15215976Sjmallett * similar Disclaimer requirement for further binary redistribution. 16215976Sjmallett * 3. Neither the names of the above-listed copyright holders nor the names 17215976Sjmallett * of any contributors may be used to endorse or promote products derived 18232812Sjmallett * from this software without specific prior written permission. 19215976Sjmallett * 20215976Sjmallett * Alternatively, this software may be distributed under the terms of the 21215976Sjmallett * GNU General Public License ("GPL") version 2 as published by the Free 22215976Sjmallett * Software Foundation. 23215976Sjmallett * 24215976Sjmallett * NO WARRANTY 25215976Sjmallett * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26215976Sjmallett * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27215976Sjmallett * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 28215976Sjmallett * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 29232812Sjmallett * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 30215976Sjmallett * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31215976Sjmallett * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32215976Sjmallett * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 33215976Sjmallett * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34215976Sjmallett * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 35215976Sjmallett * THE POSSIBILITY OF SUCH DAMAGES. 36215976Sjmallett * 37215976Sjmallett */ 38215976Sjmallett 39215976Sjmallett#include <sys/cdefs.h> 40215976Sjmallett__FBSDID("$FreeBSD: head/sys/dev/ath/ath_rate/amrr/amrr.c 155477 2006-02-09 20:49:55Z sam $"); 41215976Sjmallett 42215976Sjmallett/* 43215976Sjmallett * AMRR rate control. See: 44215976Sjmallett * http://www-sop.inria.fr/rapports/sophia/RR-5208.html 45215976Sjmallett * "IEEE 802.11 Rate Adaptation: A Practical Approach" by 46215976Sjmallett * Mathieu Lacage, Hossein Manshaei, Thierry Turletti 47215976Sjmallett */ 48215976Sjmallett#include "opt_inet.h" 49215976Sjmallett 50215976Sjmallett#include <sys/param.h> 51215976Sjmallett#include <sys/systm.h> 52232812Sjmallett#include <sys/sysctl.h> 53232812Sjmallett#include <sys/module.h> 54215976Sjmallett#include <sys/kernel.h> 55215976Sjmallett#include <sys/lock.h> 56215976Sjmallett#include <sys/mutex.h> 57215976Sjmallett#include <sys/errno.h> 58215976Sjmallett 59215976Sjmallett#include <machine/bus.h> 60232812Sjmallett#include <machine/resource.h> 61215976Sjmallett#include <sys/bus.h> 62215976Sjmallett 63215976Sjmallett#include <sys/socket.h> 64215976Sjmallett 65215976Sjmallett#include <net/if.h> 66215976Sjmallett#include <net/if_media.h> 67215976Sjmallett#include <net/if_arp.h> 68232812Sjmallett#include <net/ethernet.h> /* XXX for ether_sprintf */ 69232812Sjmallett 70232812Sjmallett#include <net80211/ieee80211_var.h> 71232812Sjmallett 72232812Sjmallett#include <net/bpf.h> 73232812Sjmallett 74232812Sjmallett#ifdef INET 75232812Sjmallett#include <netinet/in.h> 76232812Sjmallett#include <netinet/if_ether.h> 77232812Sjmallett#endif 78232812Sjmallett 79232812Sjmallett#include <dev/ath/if_athvar.h> 80232812Sjmallett#include <dev/ath/ath_rate/amrr/amrr.h> 81232812Sjmallett#include <contrib/dev/ath/ah_desc.h> 82232812Sjmallett 83232812Sjmallett#define AMRR_DEBUG 84232812Sjmallett#ifdef AMRR_DEBUG 85232812Sjmallett#define DPRINTF(sc, _fmt, ...) do { \ 86232812Sjmallett if (sc->sc_debug & 0x10) \ 87232812Sjmallett printf(_fmt, __VA_ARGS__); \ 88232812Sjmallett} while (0) 89232812Sjmallett#else 90232812Sjmallett#define DPRINTF(sc, _fmt, ...) 91232812Sjmallett#endif 92232812Sjmallett 93232812Sjmallettstatic int ath_rateinterval = 1000; /* rate ctl interval (ms) */ 94232812Sjmallettstatic int ath_rate_max_success_threshold = 10; 95232812Sjmallettstatic int ath_rate_min_success_threshold = 1; 96232812Sjmallett 97232812Sjmallettstatic void ath_ratectl(void *); 98232812Sjmallettstatic void ath_rate_update(struct ath_softc *, struct ieee80211_node *, 99232812Sjmallett int rate); 100232812Sjmallettstatic void ath_rate_ctl_start(struct ath_softc *, struct ieee80211_node *); 101232812Sjmallettstatic void ath_rate_ctl(void *, struct ieee80211_node *); 102232812Sjmallett 103232812Sjmallettvoid 104232812Sjmallettath_rate_node_init(struct ath_softc *sc, struct ath_node *an) 105232812Sjmallett{ 106232812Sjmallett /* NB: assumed to be zero'd by caller */ 107232812Sjmallett ath_rate_update(sc, &an->an_node, 0); 108232812Sjmallett} 109232812Sjmallett 110232812Sjmallettvoid 111232812Sjmallettath_rate_node_cleanup(struct ath_softc *sc, struct ath_node *an) 112232812Sjmallett{ 113232812Sjmallett} 114232812Sjmallett 115232812Sjmallettvoid 116232812Sjmallettath_rate_findrate(struct ath_softc *sc, struct ath_node *an, 117232812Sjmallett int shortPreamble, size_t frameLen, 118232812Sjmallett u_int8_t *rix, int *try0, u_int8_t *txrate) 119232812Sjmallett{ 120232812Sjmallett struct amrr_node *amn = ATH_NODE_AMRR(an); 121232812Sjmallett 122232812Sjmallett *rix = amn->amn_tx_rix0; 123232812Sjmallett *try0 = amn->amn_tx_try0; 124232812Sjmallett if (shortPreamble) 125232812Sjmallett *txrate = amn->amn_tx_rate0sp; 126232812Sjmallett else 127232812Sjmallett *txrate = amn->amn_tx_rate0; 128232812Sjmallett} 129232812Sjmallett 130232812Sjmallettvoid 131232812Sjmallettath_rate_setupxtxdesc(struct ath_softc *sc, struct ath_node *an, 132232812Sjmallett struct ath_desc *ds, int shortPreamble, u_int8_t rix) 133232812Sjmallett{ 134232812Sjmallett struct amrr_node *amn = ATH_NODE_AMRR(an); 135232812Sjmallett 136232812Sjmallett ath_hal_setupxtxdesc(sc->sc_ah, ds 137232812Sjmallett , amn->amn_tx_rate1sp, amn->amn_tx_try1 /* series 1 */ 138232812Sjmallett , amn->amn_tx_rate2sp, amn->amn_tx_try2 /* series 2 */ 139232812Sjmallett , amn->amn_tx_rate3sp, amn->amn_tx_try3 /* series 3 */ 140232812Sjmallett ); 141232812Sjmallett} 142232812Sjmallett 143232812Sjmallettvoid 144232812Sjmallettath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an, 145232812Sjmallett const struct ath_desc *ds, const struct ath_desc *ds0) 146232812Sjmallett{ 147232812Sjmallett struct amrr_node *amn = ATH_NODE_AMRR(an); 148232812Sjmallett int sr = ds->ds_txstat.ts_shortretry; 149232812Sjmallett int lr = ds->ds_txstat.ts_longretry; 150232812Sjmallett int retry_count = sr + lr; 151232812Sjmallett 152232812Sjmallett amn->amn_tx_try0_cnt++; 153232812Sjmallett if (retry_count == 1) { 154232812Sjmallett amn->amn_tx_try1_cnt++; 155232812Sjmallett } else if (retry_count == 2) { 156232812Sjmallett amn->amn_tx_try1_cnt++; 157232812Sjmallett amn->amn_tx_try2_cnt++; 158232812Sjmallett } else if (retry_count == 3) { 159232812Sjmallett amn->amn_tx_try1_cnt++; 160232812Sjmallett amn->amn_tx_try2_cnt++; 161232812Sjmallett amn->amn_tx_try3_cnt++; 162232812Sjmallett } else if (retry_count > 3) { 163232812Sjmallett amn->amn_tx_try1_cnt++; 164232812Sjmallett amn->amn_tx_try2_cnt++; 165232812Sjmallett amn->amn_tx_try3_cnt++; 166232812Sjmallett amn->amn_tx_failure_cnt++; 167232812Sjmallett } 168232812Sjmallett} 169232812Sjmallett 170232812Sjmallettvoid 171232812Sjmallettath_rate_newassoc(struct ath_softc *sc, struct ath_node *an, int isnew) 172232812Sjmallett{ 173232812Sjmallett if (isnew) 174232812Sjmallett ath_rate_ctl_start(sc, &an->an_node); 175232812Sjmallett} 176232812Sjmallett 177232812Sjmallettstatic void 178232812Sjmallettnode_reset (struct amrr_node *amn) 179232812Sjmallett{ 180232812Sjmallett amn->amn_tx_try0_cnt = 0; 181232812Sjmallett amn->amn_tx_try1_cnt = 0; 182232812Sjmallett amn->amn_tx_try2_cnt = 0; 183232812Sjmallett amn->amn_tx_try3_cnt = 0; 184232812Sjmallett amn->amn_tx_failure_cnt = 0; 185232812Sjmallett amn->amn_success = 0; 186232812Sjmallett amn->amn_recovery = 0; 187232812Sjmallett amn->amn_success_threshold = ath_rate_min_success_threshold; 188232812Sjmallett} 189232812Sjmallett 190232812Sjmallett 191232812Sjmallett/** 192232812Sjmallett * The code below assumes that we are dealing with hardware multi rate retry 193232812Sjmallett * I have no idea what will happen if you try to use this module with another 194232812Sjmallett * type of hardware. Your machine might catch fire or it might work with 195232812Sjmallett * horrible performance... 196232812Sjmallett */ 197232812Sjmallettstatic void 198232812Sjmallettath_rate_update(struct ath_softc *sc, struct ieee80211_node *ni, int rate) 199232812Sjmallett{ 200232812Sjmallett struct ath_node *an = ATH_NODE(ni); 201232812Sjmallett struct amrr_node *amn = ATH_NODE_AMRR(an); 202232812Sjmallett const HAL_RATE_TABLE *rt = sc->sc_currates; 203232812Sjmallett u_int8_t rix; 204232812Sjmallett 205232812Sjmallett KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode)); 206232812Sjmallett 207232812Sjmallett DPRINTF(sc, "%s: set xmit rate for %s to %dM\n", 208232812Sjmallett __func__, ether_sprintf(ni->ni_macaddr), 209232812Sjmallett ni->ni_rates.rs_nrates > 0 ? 210232812Sjmallett (ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL) / 2 : 0); 211232812Sjmallett 212232812Sjmallett ni->ni_txrate = rate; 213232812Sjmallett /* 214232812Sjmallett * Before associating a node has no rate set setup 215232812Sjmallett * so we can't calculate any transmit codes to use. 216232812Sjmallett * This is ok since we should never be sending anything 217232812Sjmallett * but management frames and those always go at the 218232812Sjmallett * lowest hardware rate. 219232812Sjmallett */ 220232812Sjmallett if (ni->ni_rates.rs_nrates > 0) { 221232812Sjmallett amn->amn_tx_rix0 = sc->sc_rixmap[ 222232812Sjmallett ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL]; 223232812Sjmallett amn->amn_tx_rate0 = rt->info[amn->amn_tx_rix0].rateCode; 224215976Sjmallett amn->amn_tx_rate0sp = amn->amn_tx_rate0 | 225215976Sjmallett rt->info[amn->amn_tx_rix0].shortPreamble; 226215976Sjmallett if (sc->sc_mrretry) { 227215976Sjmallett amn->amn_tx_try0 = 1; 228215976Sjmallett amn->amn_tx_try1 = 1; 229215976Sjmallett amn->amn_tx_try2 = 1; 230232812Sjmallett amn->amn_tx_try3 = 1; 231215976Sjmallett if (--rate >= 0) { 232215976Sjmallett rix = sc->sc_rixmap[ 233215976Sjmallett ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL]; 234215976Sjmallett amn->amn_tx_rate1 = rt->info[rix].rateCode; 235215976Sjmallett amn->amn_tx_rate1sp = amn->amn_tx_rate1 | 236215976Sjmallett rt->info[rix].shortPreamble; 237215976Sjmallett } else { 238215976Sjmallett amn->amn_tx_rate1 = amn->amn_tx_rate1sp = 0; 239215976Sjmallett } 240215976Sjmallett if (--rate >= 0) { 241215976Sjmallett rix = sc->sc_rixmap[ 242215976Sjmallett ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL]; 243215976Sjmallett amn->amn_tx_rate2 = rt->info[rix].rateCode; 244215976Sjmallett amn->amn_tx_rate2sp = amn->amn_tx_rate2 | 245215976Sjmallett rt->info[rix].shortPreamble; 246215976Sjmallett } else { 247215976Sjmallett amn->amn_tx_rate2 = amn->amn_tx_rate2sp = 0; 248232812Sjmallett } 249232812Sjmallett if (rate > 0) { 250232812Sjmallett /* NB: only do this if we didn't already do it above */ 251232812Sjmallett amn->amn_tx_rate3 = rt->info[0].rateCode; 252215976Sjmallett amn->amn_tx_rate3sp = 253215976Sjmallett amn->amn_tx_rate3 | rt->info[0].shortPreamble; 254215976Sjmallett } else { 255215976Sjmallett amn->amn_tx_rate3 = amn->amn_tx_rate3sp = 0; 256215976Sjmallett } 257215976Sjmallett } else { 258215976Sjmallett amn->amn_tx_try0 = ATH_TXMAXTRY; 259215976Sjmallett /* theorically, these statements are useless because 260215976Sjmallett * the code which uses them tests for an_tx_try0 == ATH_TXMAXTRY 261215976Sjmallett */ 262215976Sjmallett amn->amn_tx_try1 = 0; 263215976Sjmallett amn->amn_tx_try2 = 0; 264215976Sjmallett amn->amn_tx_try3 = 0; 265232812Sjmallett amn->amn_tx_rate1 = amn->amn_tx_rate1sp = 0; 266232812Sjmallett amn->amn_tx_rate2 = amn->amn_tx_rate2sp = 0; 267232812Sjmallett amn->amn_tx_rate3 = amn->amn_tx_rate3sp = 0; 268232812Sjmallett } 269215976Sjmallett } 270215976Sjmallett node_reset (amn); 271215976Sjmallett} 272215976Sjmallett 273215976Sjmallett/* 274215976Sjmallett * Set the starting transmit rate for a node. 275215976Sjmallett */ 276215976Sjmallettstatic void 277215976Sjmallettath_rate_ctl_start(struct ath_softc *sc, struct ieee80211_node *ni) 278215976Sjmallett{ 279215976Sjmallett#define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL) 280215976Sjmallett struct ieee80211com *ic = &sc->sc_ic; 281215976Sjmallett int srate; 282232812Sjmallett 283232812Sjmallett KASSERT(ni->ni_rates.rs_nrates > 0, ("no rates")); 284232812Sjmallett if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE) { 285232812Sjmallett /* 286215976Sjmallett * No fixed rate is requested. For 11b start with 287215976Sjmallett * the highest negotiated rate; otherwise, for 11g 288215976Sjmallett * and 11a, we start "in the middle" at 24Mb or 36Mb. 289215976Sjmallett */ 290215976Sjmallett srate = ni->ni_rates.rs_nrates - 1; 291215976Sjmallett if (sc->sc_curmode != IEEE80211_MODE_11B) { 292215976Sjmallett /* 293215976Sjmallett * Scan the negotiated rate set to find the 294215976Sjmallett * closest rate. 295215976Sjmallett */ 296215976Sjmallett /* NB: the rate set is assumed sorted */ 297215976Sjmallett for (; srate >= 0 && RATE(srate) > 72; srate--) 298215976Sjmallett ; 299215976Sjmallett KASSERT(srate >= 0, ("bogus rate set")); 300215976Sjmallett } 301215976Sjmallett } else { 302215976Sjmallett /* 303232812Sjmallett * A fixed rate is to be used; ic_fixed_rate is an 304232812Sjmallett * index into the supported rate set. Convert this 305232812Sjmallett * to the index into the negotiated rate set for 306232812Sjmallett * the node. We know the rate is there because the 307215976Sjmallett * rate set is checked when the station associates. 308215976Sjmallett */ 309215976Sjmallett const struct ieee80211_rateset *rs = 310215976Sjmallett &ic->ic_sup_rates[ic->ic_curmode]; 311215976Sjmallett int r = rs->rs_rates[ic->ic_fixed_rate] & IEEE80211_RATE_VAL; 312215976Sjmallett /* NB: the rate set is assumed sorted */ 313215976Sjmallett srate = ni->ni_rates.rs_nrates - 1; 314215976Sjmallett for (; srate >= 0 && RATE(srate) != r; srate--) 315215976Sjmallett ; 316215976Sjmallett KASSERT(srate >= 0, 317215976Sjmallett ("fixed rate %d not in rate set", ic->ic_fixed_rate)); 318215976Sjmallett } 319215976Sjmallett ath_rate_update(sc, ni, srate); 320232812Sjmallett#undef RATE 321232812Sjmallett} 322232812Sjmallett 323232812Sjmallettstatic void 324215976Sjmallettath_rate_cb(void *arg, struct ieee80211_node *ni) 325215976Sjmallett{ 326215976Sjmallett struct ath_softc *sc = arg; 327215976Sjmallett 328215976Sjmallett ath_rate_update(sc, ni, 0); 329215976Sjmallett} 330215976Sjmallett 331215976Sjmallett/* 332215976Sjmallett * Reset the rate control state for each 802.11 state transition. 333215976Sjmallett */ 334215976Sjmallettvoid 335215976Sjmallettath_rate_newstate(struct ath_softc *sc, enum ieee80211_state state) 336215976Sjmallett{ 337232812Sjmallett struct amrr_softc *asc = (struct amrr_softc *) sc->sc_rc; 338232812Sjmallett struct ieee80211com *ic = &sc->sc_ic; 339232812Sjmallett struct ieee80211_node *ni; 340232812Sjmallett 341215976Sjmallett if (state == IEEE80211_S_INIT) { 342215976Sjmallett callout_stop(&asc->timer); 343215976Sjmallett return; 344215976Sjmallett } 345215976Sjmallett if (ic->ic_opmode == IEEE80211_M_STA) { 346215976Sjmallett /* 347215976Sjmallett * Reset local xmit state; this is really only 348215976Sjmallett * meaningful when operating in station mode. 349215976Sjmallett */ 350215976Sjmallett ni = ic->ic_bss; 351215976Sjmallett if (state == IEEE80211_S_RUN) { 352215976Sjmallett ath_rate_ctl_start(sc, ni); 353215976Sjmallett } else { 354215976Sjmallett ath_rate_update(sc, ni, 0); 355232812Sjmallett } 356232812Sjmallett } else { 357232812Sjmallett /* 358232812Sjmallett * When operating as a station the node table holds 359215976Sjmallett * the AP's that were discovered during scanning. 360215976Sjmallett * For any other operating mode we want to reset the 361215976Sjmallett * tx rate state of each node. 362215976Sjmallett */ 363215976Sjmallett ieee80211_iterate_nodes(&ic->ic_sta, ath_rate_cb, sc); 364215976Sjmallett ath_rate_update(sc, ic->ic_bss, 0); 365215976Sjmallett } 366215976Sjmallett if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE && 367215976Sjmallett state == IEEE80211_S_RUN) { 368215976Sjmallett int interval; 369215976Sjmallett /* 370215976Sjmallett * Start the background rate control thread if we 371215976Sjmallett * are not configured to use a fixed xmit rate. 372232812Sjmallett */ 373232812Sjmallett interval = ath_rateinterval; 374232812Sjmallett if (ic->ic_opmode == IEEE80211_M_STA) 375232812Sjmallett interval /= 2; 376215976Sjmallett callout_reset(&asc->timer, (interval * hz) / 1000, 377215976Sjmallett ath_ratectl, sc->sc_ifp); 378215976Sjmallett } 379215976Sjmallett} 380215976Sjmallett 381215976Sjmallett/* 382215976Sjmallett * Examine and potentially adjust the transmit rate. 383215976Sjmallett */ 384215976Sjmallettstatic void 385215976Sjmallettath_rate_ctl(void *arg, struct ieee80211_node *ni) 386215976Sjmallett{ 387215976Sjmallett struct ath_softc *sc = arg; 388215976Sjmallett struct amrr_node *amn = ATH_NODE_AMRR(ATH_NODE (ni)); 389232812Sjmallett int old_rate; 390232812Sjmallett 391232812Sjmallett#define is_success(amn) \ 392232812Sjmallett(amn->amn_tx_try1_cnt < (amn->amn_tx_try0_cnt/10)) 393215976Sjmallett#define is_enough(amn) \ 394215976Sjmallett(amn->amn_tx_try0_cnt > 10) 395215976Sjmallett#define is_failure(amn) \ 396215976Sjmallett(amn->amn_tx_try1_cnt > (amn->amn_tx_try0_cnt/3)) 397215976Sjmallett#define is_max_rate(ni) \ 398215976Sjmallett((ni->ni_txrate + 1) >= ni->ni_rates.rs_nrates) 399215976Sjmallett#define is_min_rate(ni) \ 400215976Sjmallett(ni->ni_txrate == 0) 401215976Sjmallett 402215976Sjmallett old_rate = ni->ni_txrate; 403215976Sjmallett 404215976Sjmallett DPRINTF (sc, "cnt0: %d cnt1: %d cnt2: %d cnt3: %d -- threshold: %d\n", 405215976Sjmallett amn->amn_tx_try0_cnt, 406215976Sjmallett amn->amn_tx_try1_cnt, 407232812Sjmallett amn->amn_tx_try2_cnt, 408232812Sjmallett amn->amn_tx_try3_cnt, 409232812Sjmallett amn->amn_success_threshold); 410232812Sjmallett if (is_success (amn) && is_enough (amn)) { 411215976Sjmallett amn->amn_success++; 412215976Sjmallett if (amn->amn_success == amn->amn_success_threshold && 413215976Sjmallett !is_max_rate (ni)) { 414215976Sjmallett amn->amn_recovery = 1; 415215976Sjmallett amn->amn_success = 0; 416215976Sjmallett ni->ni_txrate++; 417215976Sjmallett DPRINTF (sc, "increase rate to %d\n", ni->ni_txrate); 418215976Sjmallett } else { 419215976Sjmallett amn->amn_recovery = 0; 420215976Sjmallett } 421215976Sjmallett } else if (is_failure (amn)) { 422215976Sjmallett amn->amn_success = 0; 423215976Sjmallett if (!is_min_rate (ni)) { 424232812Sjmallett if (amn->amn_recovery) { 425232812Sjmallett /* recovery failure. */ 426232812Sjmallett amn->amn_success_threshold *= 2; 427232812Sjmallett amn->amn_success_threshold = min (amn->amn_success_threshold, 428215976Sjmallett (u_int)ath_rate_max_success_threshold); 429215976Sjmallett DPRINTF (sc, "decrease rate recovery thr: %d\n", amn->amn_success_threshold); 430215976Sjmallett } else { 431215976Sjmallett /* simple failure. */ 432215976Sjmallett amn->amn_success_threshold = ath_rate_min_success_threshold; 433215976Sjmallett DPRINTF (sc, "decrease rate normal thr: %d\n", amn->amn_success_threshold); 434215976Sjmallett } 435215976Sjmallett amn->amn_recovery = 0; 436215976Sjmallett ni->ni_txrate--; 437215976Sjmallett } else { 438215976Sjmallett amn->amn_recovery = 0; 439215976Sjmallett } 440215976Sjmallett 441232812Sjmallett } 442232812Sjmallett if (is_enough (amn) || old_rate != ni->ni_txrate) { 443232812Sjmallett /* reset counters. */ 444232812Sjmallett amn->amn_tx_try0_cnt = 0; 445215976Sjmallett amn->amn_tx_try1_cnt = 0; 446215976Sjmallett amn->amn_tx_try2_cnt = 0; 447215976Sjmallett amn->amn_tx_try3_cnt = 0; 448215976Sjmallett amn->amn_tx_failure_cnt = 0; 449215976Sjmallett } 450215976Sjmallett if (old_rate != ni->ni_txrate) { 451215976Sjmallett ath_rate_update(sc, ni, ni->ni_txrate); 452215976Sjmallett } 453215976Sjmallett} 454215976Sjmallett 455215976Sjmallettstatic void 456215976Sjmallettath_ratectl(void *arg) 457215976Sjmallett{ 458215976Sjmallett struct ifnet *ifp = arg; 459215976Sjmallett struct ath_softc *sc = ifp->if_softc; 460215976Sjmallett struct amrr_softc *asc = (struct amrr_softc *) sc->sc_rc; 461215976Sjmallett struct ieee80211com *ic = &sc->sc_ic; 462232812Sjmallett int interval; 463232812Sjmallett 464232812Sjmallett if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 465232812Sjmallett sc->sc_stats.ast_rate_calls++; 466215976Sjmallett 467215976Sjmallett if (ic->ic_opmode == IEEE80211_M_STA) 468215976Sjmallett ath_rate_ctl(sc, ic->ic_bss); /* NB: no reference */ 469215976Sjmallett else 470215976Sjmallett ieee80211_iterate_nodes(&ic->ic_sta, ath_rate_ctl, sc); 471215976Sjmallett } 472215976Sjmallett interval = ath_rateinterval; 473215976Sjmallett if (ic->ic_opmode == IEEE80211_M_STA) 474215976Sjmallett interval /= 2; 475215976Sjmallett callout_reset(&asc->timer, (interval * hz) / 1000, 476215976Sjmallett ath_ratectl, sc->sc_ifp); 477215976Sjmallett} 478215976Sjmallett 479215976Sjmallettstatic void 480232812Sjmallettath_rate_sysctlattach(struct ath_softc *sc) 481232812Sjmallett{ 482232812Sjmallett struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev); 483232812Sjmallett struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev); 484215976Sjmallett 485215976Sjmallett SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 486215976Sjmallett "rate_interval", CTLFLAG_RW, &ath_rateinterval, 0, 487215976Sjmallett "rate control: operation interval (ms)"); 488215976Sjmallett /* XXX bounds check values */ 489215976Sjmallett SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 490215976Sjmallett "max_sucess_threshold", CTLFLAG_RW, 491215976Sjmallett &ath_rate_max_success_threshold, 0, ""); 492215976Sjmallett SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 493215976Sjmallett "min_sucess_threshold", CTLFLAG_RW, 494232812Sjmallett &ath_rate_min_success_threshold, 0, ""); 495215976Sjmallett} 496215976Sjmallett 497215976Sjmallettstruct ath_ratectrl * 498215976Sjmallettath_rate_attach(struct ath_softc *sc) 499215976Sjmallett{ 500215976Sjmallett struct amrr_softc *asc; 501215976Sjmallett 502232812Sjmallett asc = malloc(sizeof(struct amrr_softc), M_DEVBUF, M_NOWAIT|M_ZERO); 503232812Sjmallett if (asc == NULL) 504215976Sjmallett return NULL; 505232812Sjmallett asc->arc.arc_space = sizeof(struct amrr_node); 506232812Sjmallett callout_init(&asc->timer, debug_mpsafenet ? CALLOUT_MPSAFE : 0); 507232812Sjmallett ath_rate_sysctlattach(sc); 508215976Sjmallett 509215976Sjmallett return &asc->arc; 510232812Sjmallett} 511215976Sjmallett 512232812Sjmallettvoid 513232812Sjmallettath_rate_detach(struct ath_ratectrl *arc) 514232812Sjmallett{ 515232812Sjmallett struct amrr_softc *asc = (struct amrr_softc *) arc; 516232812Sjmallett 517232812Sjmallett callout_drain(&asc->timer); 518232812Sjmallett free(asc, M_DEVBUF); 519232812Sjmallett} 520232812Sjmallett 521232812Sjmallett/* 522232812Sjmallett * Module glue. 523232812Sjmallett */ 524232812Sjmallettstatic int 525232812Sjmallettamrr_modevent(module_t mod, int type, void *unused) 526232812Sjmallett{ 527232812Sjmallett switch (type) { 528232812Sjmallett case MOD_LOAD: 529232812Sjmallett if (bootverbose) 530232812Sjmallett printf("ath_rate: <AMRR rate control algorithm> version 0.1\n"); 531232812Sjmallett return 0; 532232812Sjmallett case MOD_UNLOAD: 533232812Sjmallett return 0; 534232812Sjmallett } 535232812Sjmallett return EINVAL; 536232812Sjmallett} 537232812Sjmallett 538232812Sjmallettstatic moduledata_t amrr_mod = { 539232812Sjmallett "ath_rate", 540232812Sjmallett amrr_modevent, 541232812Sjmallett 0 542232812Sjmallett}; 543232812SjmallettDECLARE_MODULE(ath_rate, amrr_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 544232812SjmallettMODULE_VERSION(ath_rate, 1); 545232812SjmallettMODULE_DEPEND(ath_rate, wlan, 1, 1, 1); 546232812Sjmallett