2 * Copyright (c) 2004 INRIA
3 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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15 * similar Disclaimer requirement for further binary redistribution.
16 * 3. Neither the names of the above-listed copyright holders nor the names
17 * of any contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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27 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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33 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
35 * THE POSSIBILITY OF SUCH DAMAGES.
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
43 * AMRR rate control. See:
44 * http://www-sop.inria.fr/rapports/sophia/RR-5208.html
45 * "IEEE 802.11 Rate Adaptation: A Practical Approach" by
46 * Mathieu Lacage, Hossein Manshaei, Thierry Turletti
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/sysctl.h>
54 #include <sys/kernel.h>
56 #include <sys/mutex.h>
57 #include <sys/errno.h>
59 #include <machine/bus.h>
60 #include <machine/resource.h>
63 #include <sys/socket.h>
66 #include <net/if_media.h>
67 #include <net/if_arp.h>
69 #include <net80211/ieee80211_var.h>
74 #include <netinet/in.h>
75 #include <netinet/if_ether.h>
78 #include <dev/ath/if_athvar.h>
79 #include <dev/ath/ath_rate/amrr/amrr.h>
80 #include <dev/ath/ath_hal/ah_desc.h>
82 static int ath_rateinterval = 1000; /* rate ctl interval (ms) */
83 static int ath_rate_max_success_threshold = 10;
84 static int ath_rate_min_success_threshold = 1;
86 static void ath_rate_update(struct ath_softc *, struct ieee80211_node *,
88 static void ath_rate_ctl_start(struct ath_softc *, struct ieee80211_node *);
89 static void ath_rate_ctl(void *, struct ieee80211_node *);
92 ath_rate_node_init(struct ath_softc *sc, struct ath_node *an)
94 /* NB: assumed to be zero'd by caller */
98 ath_rate_node_cleanup(struct ath_softc *sc, struct ath_node *an)
103 ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
104 int shortPreamble, size_t frameLen,
105 u_int8_t *rix, int *try0, u_int8_t *txrate)
107 struct amrr_node *amn = ATH_NODE_AMRR(an);
109 *rix = amn->amn_tx_rix0;
110 *try0 = amn->amn_tx_try0;
112 *txrate = amn->amn_tx_rate0sp;
114 *txrate = amn->amn_tx_rate0;
118 ath_rate_setupxtxdesc(struct ath_softc *sc, struct ath_node *an,
119 struct ath_desc *ds, int shortPreamble, u_int8_t rix)
121 struct amrr_node *amn = ATH_NODE_AMRR(an);
123 ath_hal_setupxtxdesc(sc->sc_ah, ds
124 , amn->amn_tx_rate1sp, amn->amn_tx_try1 /* series 1 */
125 , amn->amn_tx_rate2sp, amn->amn_tx_try2 /* series 2 */
126 , amn->amn_tx_rate3sp, amn->amn_tx_try3 /* series 3 */
131 ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
132 const struct ath_buf *bf)
134 struct amrr_node *amn = ATH_NODE_AMRR(an);
135 const struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
136 int sr = ts->ts_shortretry;
137 int lr = ts->ts_longretry;
138 int retry_count = sr + lr;
140 amn->amn_tx_try0_cnt++;
141 if (retry_count == 1) {
142 amn->amn_tx_try1_cnt++;
143 } else if (retry_count == 2) {
144 amn->amn_tx_try1_cnt++;
145 amn->amn_tx_try2_cnt++;
146 } else if (retry_count == 3) {
147 amn->amn_tx_try1_cnt++;
148 amn->amn_tx_try2_cnt++;
149 amn->amn_tx_try3_cnt++;
150 } else if (retry_count > 3) {
151 amn->amn_tx_try1_cnt++;
152 amn->amn_tx_try2_cnt++;
153 amn->amn_tx_try3_cnt++;
154 amn->amn_tx_failure_cnt++;
156 if (amn->amn_interval != 0 &&
157 ticks - amn->amn_ticks > amn->amn_interval) {
158 ath_rate_ctl(sc, &an->an_node);
159 amn->amn_ticks = ticks;
164 ath_rate_newassoc(struct ath_softc *sc, struct ath_node *an, int isnew)
167 ath_rate_ctl_start(sc, &an->an_node);
171 node_reset(struct amrr_node *amn)
173 amn->amn_tx_try0_cnt = 0;
174 amn->amn_tx_try1_cnt = 0;
175 amn->amn_tx_try2_cnt = 0;
176 amn->amn_tx_try3_cnt = 0;
177 amn->amn_tx_failure_cnt = 0;
178 amn->amn_success = 0;
179 amn->amn_recovery = 0;
180 amn->amn_success_threshold = ath_rate_min_success_threshold;
185 * The code below assumes that we are dealing with hardware multi rate retry
186 * I have no idea what will happen if you try to use this module with another
187 * type of hardware. Your machine might catch fire or it might work with
188 * horrible performance...
191 ath_rate_update(struct ath_softc *sc, struct ieee80211_node *ni, int rate)
193 struct ath_node *an = ATH_NODE(ni);
194 struct amrr_node *amn = ATH_NODE_AMRR(an);
195 struct ieee80211vap *vap = ni->ni_vap;
196 const HAL_RATE_TABLE *rt = sc->sc_currates;
199 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
201 IEEE80211_NOTE(vap, IEEE80211_MSG_RATECTL, ni,
202 "%s: set xmit rate to %dM", __func__,
203 ni->ni_rates.rs_nrates > 0 ?
204 (ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL) / 2 : 0);
208 * Before associating a node has no rate set setup
209 * so we can't calculate any transmit codes to use.
210 * This is ok since we should never be sending anything
211 * but management frames and those always go at the
212 * lowest hardware rate.
214 if (ni->ni_rates.rs_nrates > 0) {
215 ni->ni_txrate = ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL;
216 amn->amn_tx_rix0 = sc->sc_rixmap[ni->ni_txrate];
217 amn->amn_tx_rate0 = rt->info[amn->amn_tx_rix0].rateCode;
218 amn->amn_tx_rate0sp = amn->amn_tx_rate0 |
219 rt->info[amn->amn_tx_rix0].shortPreamble;
220 if (sc->sc_mrretry) {
221 amn->amn_tx_try0 = 1;
222 amn->amn_tx_try1 = 1;
223 amn->amn_tx_try2 = 1;
224 amn->amn_tx_try3 = 1;
227 ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL];
228 amn->amn_tx_rate1 = rt->info[rix].rateCode;
229 amn->amn_tx_rate1sp = amn->amn_tx_rate1 |
230 rt->info[rix].shortPreamble;
232 amn->amn_tx_rate1 = amn->amn_tx_rate1sp = 0;
236 ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL];
237 amn->amn_tx_rate2 = rt->info[rix].rateCode;
238 amn->amn_tx_rate2sp = amn->amn_tx_rate2 |
239 rt->info[rix].shortPreamble;
241 amn->amn_tx_rate2 = amn->amn_tx_rate2sp = 0;
244 /* NB: only do this if we didn't already do it above */
245 amn->amn_tx_rate3 = rt->info[0].rateCode;
246 amn->amn_tx_rate3sp =
247 amn->amn_tx_rate3 | rt->info[0].shortPreamble;
249 amn->amn_tx_rate3 = amn->amn_tx_rate3sp = 0;
252 amn->amn_tx_try0 = ATH_TXMAXTRY;
253 /* theorically, these statements are useless because
254 * the code which uses them tests for an_tx_try0 == ATH_TXMAXTRY
256 amn->amn_tx_try1 = 0;
257 amn->amn_tx_try2 = 0;
258 amn->amn_tx_try3 = 0;
259 amn->amn_tx_rate1 = amn->amn_tx_rate1sp = 0;
260 amn->amn_tx_rate2 = amn->amn_tx_rate2sp = 0;
261 amn->amn_tx_rate3 = amn->amn_tx_rate3sp = 0;
266 amn->amn_interval = ath_rateinterval;
267 if (vap->iv_opmode == IEEE80211_M_STA)
268 amn->amn_interval /= 2;
269 amn->amn_interval = (amn->amn_interval * hz) / 1000;
273 * Set the starting transmit rate for a node.
276 ath_rate_ctl_start(struct ath_softc *sc, struct ieee80211_node *ni)
278 #define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
279 const struct ieee80211_txparam *tp = ni->ni_txparms;
282 KASSERT(ni->ni_rates.rs_nrates > 0, ("no rates"));
283 if (tp == NULL || tp->ucastrate == IEEE80211_FIXED_RATE_NONE) {
285 * No fixed rate is requested. For 11b start with
286 * the highest negotiated rate; otherwise, for 11g
287 * and 11a, we start "in the middle" at 24Mb or 36Mb.
289 srate = ni->ni_rates.rs_nrates - 1;
290 if (sc->sc_curmode != IEEE80211_MODE_11B) {
292 * Scan the negotiated rate set to find the
295 /* NB: the rate set is assumed sorted */
296 for (; srate >= 0 && RATE(srate) > 72; srate--)
301 * A fixed rate is to be used; ic_fixed_rate is the
302 * IEEE code for this rate (sans basic bit). Convert this
303 * to the index into the negotiated rate set for
304 * the node. We know the rate is there because the
305 * rate set is checked when the station associates.
307 /* NB: the rate set is assumed sorted */
308 srate = ni->ni_rates.rs_nrates - 1;
309 for (; srate >= 0 && RATE(srate) != tp->ucastrate; srate--)
313 * The selected rate may not be available due to races
314 * and mode settings. Also orphaned nodes created in
315 * adhoc mode may not have any rate set so this lookup
316 * can fail. This is not fatal.
318 ath_rate_update(sc, ni, srate < 0 ? 0 : srate);
323 * Examine and potentially adjust the transmit rate.
326 ath_rate_ctl(void *arg, struct ieee80211_node *ni)
328 struct ath_softc *sc = arg;
329 struct amrr_node *amn = ATH_NODE_AMRR(ATH_NODE (ni));
332 #define is_success(amn) \
333 (amn->amn_tx_try1_cnt < (amn->amn_tx_try0_cnt/10))
334 #define is_enough(amn) \
335 (amn->amn_tx_try0_cnt > 10)
336 #define is_failure(amn) \
337 (amn->amn_tx_try1_cnt > (amn->amn_tx_try0_cnt/3))
341 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
342 "cnt0: %d cnt1: %d cnt2: %d cnt3: %d -- threshold: %d",
343 amn->amn_tx_try0_cnt, amn->amn_tx_try1_cnt, amn->amn_tx_try2_cnt,
344 amn->amn_tx_try3_cnt, amn->amn_success_threshold);
345 if (is_success (amn) && is_enough (amn)) {
347 if (amn->amn_success == amn->amn_success_threshold &&
348 rix + 1 < ni->ni_rates.rs_nrates) {
349 amn->amn_recovery = 1;
350 amn->amn_success = 0;
352 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
353 "increase rate to %d", rix);
355 amn->amn_recovery = 0;
357 } else if (is_failure (amn)) {
358 amn->amn_success = 0;
360 if (amn->amn_recovery) {
361 /* recovery failure. */
362 amn->amn_success_threshold *= 2;
363 amn->amn_success_threshold = min (amn->amn_success_threshold,
364 (u_int)ath_rate_max_success_threshold);
365 IEEE80211_NOTE(ni->ni_vap,
366 IEEE80211_MSG_RATECTL, ni,
367 "decrease rate recovery thr: %d",
368 amn->amn_success_threshold);
370 /* simple failure. */
371 amn->amn_success_threshold = ath_rate_min_success_threshold;
372 IEEE80211_NOTE(ni->ni_vap,
373 IEEE80211_MSG_RATECTL, ni,
374 "decrease rate normal thr: %d",
375 amn->amn_success_threshold);
377 amn->amn_recovery = 0;
380 amn->amn_recovery = 0;
384 if (is_enough (amn) || rix != amn->amn_rix) {
385 /* reset counters. */
386 amn->amn_tx_try0_cnt = 0;
387 amn->amn_tx_try1_cnt = 0;
388 amn->amn_tx_try2_cnt = 0;
389 amn->amn_tx_try3_cnt = 0;
390 amn->amn_tx_failure_cnt = 0;
392 if (rix != amn->amn_rix) {
393 ath_rate_update(sc, ni, rix);
398 ath_rate_sysctlattach(struct ath_softc *sc)
400 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev);
401 struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev);
403 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
404 "rate_interval", CTLFLAG_RW, &ath_rateinterval, 0,
405 "rate control: operation interval (ms)");
406 /* XXX bounds check values */
407 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
408 "max_sucess_threshold", CTLFLAG_RW,
409 &ath_rate_max_success_threshold, 0, "");
410 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
411 "min_sucess_threshold", CTLFLAG_RW,
412 &ath_rate_min_success_threshold, 0, "");
415 struct ath_ratectrl *
416 ath_rate_attach(struct ath_softc *sc)
418 struct amrr_softc *asc;
420 asc = malloc(sizeof(struct amrr_softc), M_DEVBUF, M_NOWAIT|M_ZERO);
423 asc->arc.arc_space = sizeof(struct amrr_node);
424 ath_rate_sysctlattach(sc);
430 ath_rate_detach(struct ath_ratectrl *arc)
432 struct amrr_softc *asc = (struct amrr_softc *) arc;