1 /* $OpenBSD: ieee80211_amrr.c,v 1.1 2006/06/17 19:07:19 damien Exp $ */
2
3 /*-
4 * Copyright (c) 2010 Rui Paulo <rpaulo@FreeBSD.org>
5 * Copyright (c) 2006
6 * Damien Bergamini <damien.bergamini@free.fr>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21 #include <sys/cdefs.h>
22 /*-
23 * Naive implementation of the Adaptive Multi Rate Retry algorithm:
24 *
25 * "IEEE 802.11 Rate Adaptation: A Practical Approach"
26 * Mathieu Lacage, Hossein Manshaei, Thierry Turletti
27 * INRIA Sophia - Projet Planete
28 * http://www-sop.inria.fr/rapports/sophia/RR-5208.html
29 */
30 #include "opt_wlan.h"
31
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
35 #include <sys/module.h>
36 #include <sys/sbuf.h>
37 #include <sys/socket.h>
38 #include <sys/sysctl.h>
39
40 #include <net/if.h>
41 #include <net/if_var.h>
42 #include <net/if_media.h>
43 #include <net/ethernet.h>
44
45 #ifdef INET
46 #include <netinet/in.h>
47 #include <netinet/if_ether.h>
48 #endif
49
50 #include <net80211/ieee80211_var.h>
51 #include <net80211/ieee80211_ht.h>
52 #include <net80211/ieee80211_vht.h>
53 #include <net80211/ieee80211_amrr.h>
54 #include <net80211/ieee80211_ratectl.h>
55
56 #define is_success(amn) \
57 ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10)
58 #define is_failure(amn) \
59 ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3)
60 #define is_enough(amn) \
61 ((amn)->amn_txcnt > 10)
62
63 static void amrr_setinterval(const struct ieee80211vap *, int);
64 static void amrr_init(struct ieee80211vap *);
65 static void amrr_deinit(struct ieee80211vap *);
66 static void amrr_node_init(struct ieee80211_node *);
67 static void amrr_node_deinit(struct ieee80211_node *);
68 static int amrr_update(struct ieee80211_amrr *,
69 struct ieee80211_amrr_node *, struct ieee80211_node *);
70 static int amrr_rate(struct ieee80211_node *, void *, uint32_t);
71 static void amrr_tx_complete(const struct ieee80211_node *,
72 const struct ieee80211_ratectl_tx_status *);
73 static void amrr_tx_update_cb(void *, struct ieee80211_node *);
74 static void amrr_tx_update(struct ieee80211vap *vap,
75 struct ieee80211_ratectl_tx_stats *);
76 static void amrr_sysctlattach(struct ieee80211vap *,
77 struct sysctl_ctx_list *, struct sysctl_oid *);
78 static void amrr_node_stats(struct ieee80211_node *ni, struct sbuf *s);
79
80 /* number of references from net80211 layer */
81 static int nrefs = 0;
82
83 static const struct ieee80211_ratectl amrr = {
84 .ir_name = "amrr",
85 .ir_attach = NULL,
86 .ir_detach = NULL,
87 .ir_init = amrr_init,
88 .ir_deinit = amrr_deinit,
89 .ir_node_init = amrr_node_init,
90 .ir_node_deinit = amrr_node_deinit,
91 .ir_rate = amrr_rate,
92 .ir_tx_complete = amrr_tx_complete,
93 .ir_tx_update = amrr_tx_update,
94 .ir_setinterval = amrr_setinterval,
95 .ir_node_stats = amrr_node_stats,
96 };
97 IEEE80211_RATECTL_MODULE(amrr, 1);
98 IEEE80211_RATECTL_ALG(amrr, IEEE80211_RATECTL_AMRR, amrr);
99
100 static void
amrr_setinterval(const struct ieee80211vap * vap,int msecs)101 amrr_setinterval(const struct ieee80211vap *vap, int msecs)
102 {
103 struct ieee80211_amrr *amrr = vap->iv_rs;
104
105 if (!amrr)
106 return;
107
108 if (msecs < 100)
109 msecs = 100;
110 amrr->amrr_interval = msecs_to_ticks(msecs);
111 }
112
113 static void
amrr_init(struct ieee80211vap * vap)114 amrr_init(struct ieee80211vap *vap)
115 {
116 struct ieee80211_amrr *amrr;
117
118 KASSERT(vap->iv_rs == NULL, ("%s called multiple times", __func__));
119
120 nrefs++; /* XXX locking */
121 amrr = vap->iv_rs = IEEE80211_MALLOC(sizeof(struct ieee80211_amrr),
122 M_80211_RATECTL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
123 if (amrr == NULL) {
124 net80211_vap_printf(vap, "couldn't alloc ratectl structure\n");
125 return;
126 }
127 amrr->amrr_min_success_threshold = IEEE80211_AMRR_MIN_SUCCESS_THRESHOLD;
128 amrr->amrr_max_success_threshold = IEEE80211_AMRR_MAX_SUCCESS_THRESHOLD;
129 amrr_setinterval(vap, 500 /* ms */);
130 amrr_sysctlattach(vap, vap->iv_sysctl, vap->iv_oid);
131 }
132
133 static void
amrr_deinit(struct ieee80211vap * vap)134 amrr_deinit(struct ieee80211vap *vap)
135 {
136 KASSERT(nrefs > 0, ("imbalanced attach/detach"));
137 IEEE80211_FREE(vap->iv_rs, M_80211_RATECTL);
138 vap->iv_rs = NULL; /* guard */
139 nrefs--; /* XXX locking */
140 }
141
142 static void
amrr_node_init_vht(struct ieee80211_node * ni)143 amrr_node_init_vht(struct ieee80211_node *ni)
144 {
145 struct ieee80211_amrr_node *amn = ni->ni_rctls;
146
147 /* Default to VHT NSS 1 MCS 2; should be reliable! */
148 amn->amn_vht_mcs = 2;
149 amn->amn_vht_nss = 1;
150 ieee80211_node_set_txrate_vht_rate(ni, amn->amn_vht_nss,
151 amn->amn_vht_mcs);
152
153 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
154 "AMRR: VHT: initial rate NSS %d MCS %d",
155 amn->amn_vht_nss,
156 amn->amn_vht_mcs);
157 }
158
159 static void
amrr_node_init_ht(struct ieee80211_node * ni)160 amrr_node_init_ht(struct ieee80211_node *ni)
161 {
162 const struct ieee80211_rateset *rs;
163 struct ieee80211_amrr_node *amn = ni->ni_rctls;
164 uint8_t rate; /* dot11rate */
165
166 rs = (struct ieee80211_rateset *) &ni->ni_htrates;
167 /* Initial rate - lowest */
168 rate = rs->rs_rates[0];
169
170 /* Pick something low that's likely to succeed */
171 for (amn->amn_rix = rs->rs_nrates - 1; amn->amn_rix > 0;
172 amn->amn_rix--) {
173 /* 11n - stop at MCS4 */
174 if ((rs->rs_rates[amn->amn_rix] & 0x1f) < 4)
175 break;
176 }
177 rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
178
179 /* Ensure the MCS bit is set */
180 rate |= IEEE80211_RATE_MCS;
181
182 /* Assign initial rate from the rateset */
183 ieee80211_node_set_txrate_dot11rate(ni, rate);
184
185 /* XXX TODO: we really need a rate-to-string method */
186 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
187 "AMRR: nrates=%d, initial rate MCS %d",
188 rs->rs_nrates,
189 (rate & IEEE80211_RATE_VAL));
190 }
191
192 static void
amrr_node_init_legacy(struct ieee80211_node * ni)193 amrr_node_init_legacy(struct ieee80211_node *ni)
194 {
195 const struct ieee80211_rateset *rs;
196 struct ieee80211_amrr_node *amn = ni->ni_rctls;
197 uint8_t rate; /* dot11rate */
198
199 rs = &ni->ni_rates;
200 /* Initial rate - lowest */
201 rate = rs->rs_rates[0];
202
203 /* Clear the basic rate flag if it's not 11n */
204 rate &= IEEE80211_RATE_VAL;
205
206 /* Pick something low that's likely to succeed */
207 for (amn->amn_rix = rs->rs_nrates - 1; amn->amn_rix > 0;
208 amn->amn_rix--) {
209 /* legacy - anything < 36mbit, stop searching */
210 if ((rs->rs_rates[amn->amn_rix] &
211 IEEE80211_RATE_VAL) <= 72)
212 break;
213 }
214 rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
215
216 /* Assign initial rate from the rateset */
217 ieee80211_node_set_txrate_dot11rate(ni, rate);
218
219 /* XXX TODO: we really need a rate-to-string method */
220 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
221 "AMRR: nrates=%d, initial rate %d Mb",
222 rs->rs_nrates,
223 (rate & IEEE80211_RATE_VAL) / 2);
224 }
225
226 static void
amrr_node_init(struct ieee80211_node * ni)227 amrr_node_init(struct ieee80211_node *ni)
228 {
229 struct ieee80211vap *vap = ni->ni_vap;
230 struct ieee80211_amrr *amrr = vap->iv_rs;
231 struct ieee80211_amrr_node *amn;
232
233 if (!amrr) {
234 net80211_vap_printf(vap,
235 "ratectl structure was not allocated, "
236 "per-node structure allocation skipped\n");
237 return;
238 }
239
240 if (ni->ni_rctls == NULL) {
241 ni->ni_rctls = amn = IEEE80211_MALLOC(sizeof(struct ieee80211_amrr_node),
242 M_80211_RATECTL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
243 if (amn == NULL) {
244 net80211_vap_printf(vap,
245 "couldn't alloc per-node ratectl structure\n");
246 return;
247 }
248 } else
249 amn = ni->ni_rctls;
250
251 /* Common state */
252 amn->amn_amrr = amrr;
253 amn->amn_success = 0;
254 amn->amn_recovery = 0;
255 amn->amn_txcnt = amn->amn_retrycnt = 0;
256 amn->amn_success_threshold = amrr->amrr_min_success_threshold;
257 amn->amn_ticks = ticks;
258
259 /* Pick the right rateset */
260 if (ieee80211_vht_check_tx_vht(ni))
261 amrr_node_init_vht(ni);
262 else if (ieee80211_ht_check_tx_ht(ni))
263 amrr_node_init_ht(ni);
264 else
265 amrr_node_init_legacy(ni);
266 }
267
268 static void
amrr_node_deinit(struct ieee80211_node * ni)269 amrr_node_deinit(struct ieee80211_node *ni)
270 {
271 IEEE80211_FREE(ni->ni_rctls, M_80211_RATECTL);
272 }
273
274 static void
amrr_update_vht_inc(struct ieee80211_node * ni)275 amrr_update_vht_inc(struct ieee80211_node *ni)
276 {
277 struct ieee80211_amrr_node *amn = ni->ni_rctls;
278 uint8_t nss, mcs;
279
280 /*
281 * For now just keep looping over MCS to 9, then NSS up, checking if
282 * it's valid via ieee80211_vht_node_check_tx_valid_mcs(),
283 * until we hit max. This at least tests the VHT MCS rates,
284 * but definitely is suboptimal (in the same way the 11n MCS selection
285 * is suboptimal.)
286 */
287 nss = amn->amn_vht_nss;
288 mcs = amn->amn_vht_mcs;
289
290 while (nss <= 8 && mcs <= 9) {
291 /* Increment MCS 0..9, NSS 1..8 */
292 if (mcs == 9) {
293 mcs = 0;
294 nss++;
295 } else
296 mcs++;
297 if (nss > 8)
298 break;
299
300 if (ieee80211_vht_node_check_tx_valid_mcs(ni, ni->ni_chw, nss,
301 mcs)) {
302 amn->amn_vht_nss = nss;
303 amn->amn_vht_mcs = mcs;
304 break;
305 }
306 }
307 }
308
309 static void
amrr_update_vht_dec(struct ieee80211_node * ni)310 amrr_update_vht_dec(struct ieee80211_node *ni)
311 {
312 struct ieee80211_amrr_node *amn = ni->ni_rctls;
313 uint8_t nss, mcs;
314
315 /*
316 * For now just keep looping over MCS 9 .. 0 then NSS down, checking if
317 * it's valid via ieee80211_vht_node_check_tx_valid_mcs(),
318 * until we hit min. This at least tests the VHT MCS rates,
319 * but definitely is suboptimal (in the same way the 11n MCS selection
320 * is suboptimal.
321 */
322 nss = amn->amn_vht_nss;
323 mcs = amn->amn_vht_mcs;
324
325 while (nss >= 1 && mcs >= 0) {
326
327 if (mcs == 0) {
328 mcs = 9;
329 nss--;
330 } else
331 mcs--;
332 if (nss < 1)
333 break;
334
335 if (ieee80211_vht_node_check_tx_valid_mcs(ni, ni->ni_chw, nss,
336 mcs)) {
337 amn->amn_vht_nss = nss;
338 amn->amn_vht_mcs = mcs;
339 break;
340 }
341 }
342 }
343
344 /*
345 * A placeholder / temporary hack VHT rate control.
346 *
347 * Use the available MCS rates at the current node bandwidth
348 * and configured / negotiated MCS rates.
349 */
350 static int
amrr_update_vht(struct ieee80211_node * ni)351 amrr_update_vht(struct ieee80211_node *ni)
352 {
353 struct ieee80211_amrr_node *amn = ni->ni_rctls;
354 struct ieee80211_amrr *amrr = ni->ni_vap->iv_rs;
355
356 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
357 "AMRR: VHT: current rate NSS %d MCS %d, txcnt=%d, retrycnt=%d",
358 amn->amn_vht_nss, amn->amn_vht_mcs, amn->amn_txcnt,
359 amn->amn_retrycnt);
360
361 if (is_success(amn)) {
362 amn->amn_success++;
363 if (amn->amn_success >= amn->amn_success_threshold) {
364 amn->amn_recovery = 1;
365 amn->amn_success = 0;
366
367 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
368 "AMRR: VHT: increase rate (txcnt=%d retrycnt=%d)",
369 amn->amn_txcnt, amn->amn_retrycnt);
370
371 amrr_update_vht_inc(ni);
372 } else {
373 amn->amn_recovery = 0;
374 }
375 } else if (is_failure(amn)) {
376 amn->amn_success = 0;
377
378 if (amn->amn_recovery) {
379 amn->amn_success_threshold *= 2;
380 if (amn->amn_success_threshold >
381 amrr->amrr_max_success_threshold)
382 amn->amn_success_threshold =
383 amrr->amrr_max_success_threshold;
384 } else {
385 amn->amn_success_threshold =
386 amrr->amrr_min_success_threshold;
387 }
388 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
389 "AMRR: VHT: decreasing rate (txcnt=%d retrycnt=%d)",
390 amn->amn_txcnt, amn->amn_retrycnt);
391
392 amrr_update_vht_dec(ni);
393
394 amn->amn_recovery = 0;
395 }
396
397 /* Reset counters */
398 amn->amn_txcnt = 0;
399 amn->amn_retrycnt = 0;
400
401 /* Return 0, not useful anymore */
402 return (0);
403 }
404
405 static int
amrr_update_ht(struct ieee80211_amrr * amrr,struct ieee80211_amrr_node * amn,struct ieee80211_node * ni)406 amrr_update_ht(struct ieee80211_amrr *amrr, struct ieee80211_amrr_node *amn,
407 struct ieee80211_node *ni)
408 {
409 int rix = amn->amn_rix;
410 const struct ieee80211_rateset *rs;
411
412 rs = (struct ieee80211_rateset *)&ni->ni_htrates;
413
414 /* XXX TODO: we really need a rate-to-string method */
415 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
416 "AMRR: current rate MCS %d, txcnt=%d, retrycnt=%d",
417 rs->rs_rates[rix] & IEEE80211_RATE_VAL,
418 amn->amn_txcnt,
419 amn->amn_retrycnt);
420
421 /*
422 * XXX This is totally bogus for 11n, as although high MCS
423 * rates for each stream may be failing, the next stream
424 * should be checked.
425 *
426 * Eg, if MCS5 is ok but MCS6/7 isn't, and we can go up to
427 * MCS23, we should skip 6/7 and try 8 onwards.
428 */
429 if (is_success(amn)) {
430 amn->amn_success++;
431 if (amn->amn_success >= amn->amn_success_threshold &&
432 rix + 1 < rs->rs_nrates) {
433 amn->amn_recovery = 1;
434 amn->amn_success = 0;
435 rix++;
436 /* XXX TODO: we really need a rate-to-string method */
437 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
438 "AMRR increasing rate MCS %d "
439 "(txcnt=%d retrycnt=%d)",
440 rs->rs_rates[rix] & IEEE80211_RATE_VAL,
441 amn->amn_txcnt, amn->amn_retrycnt);
442 } else {
443 amn->amn_recovery = 0;
444 }
445 } else if (is_failure(amn)) {
446 amn->amn_success = 0;
447 if (rix > 0) {
448 if (amn->amn_recovery) {
449 amn->amn_success_threshold *= 2;
450 if (amn->amn_success_threshold >
451 amrr->amrr_max_success_threshold)
452 amn->amn_success_threshold =
453 amrr->amrr_max_success_threshold;
454 } else {
455 amn->amn_success_threshold =
456 amrr->amrr_min_success_threshold;
457 }
458 rix--;
459 /* XXX TODO: we really need a rate-to-string method */
460 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
461 "AMRR decreasing rate MCS %d "
462 "(txcnt=%d retrycnt=%d)",
463 rs->rs_rates[rix] & IEEE80211_RATE_VAL,
464 amn->amn_txcnt, amn->amn_retrycnt);
465 }
466 amn->amn_recovery = 0;
467 }
468
469 return (rix);
470 }
471
472 static int
amrr_update_legacy(struct ieee80211_amrr * amrr,struct ieee80211_amrr_node * amn,struct ieee80211_node * ni)473 amrr_update_legacy(struct ieee80211_amrr *amrr, struct ieee80211_amrr_node *amn,
474 struct ieee80211_node *ni)
475 {
476 int rix = amn->amn_rix;
477 const struct ieee80211_rateset *rs;
478
479 rs = &ni->ni_rates;
480
481 /* XXX TODO: we really need a rate-to-string method */
482 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
483 "AMRR: current rate %d Mb, txcnt=%d, retrycnt=%d",
484 (rs->rs_rates[rix] & IEEE80211_RATE_VAL) / 2,
485 amn->amn_txcnt,
486 amn->amn_retrycnt);
487
488 if (is_success(amn)) {
489 amn->amn_success++;
490 if (amn->amn_success >= amn->amn_success_threshold &&
491 rix + 1 < rs->rs_nrates) {
492 amn->amn_recovery = 1;
493 amn->amn_success = 0;
494 rix++;
495 /* XXX TODO: we really need a rate-to-string method */
496 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
497 "AMRR increasing rate %d Mb (txcnt=%d retrycnt=%d)",
498 (rs->rs_rates[rix] & IEEE80211_RATE_VAL) / 2,
499 amn->amn_txcnt, amn->amn_retrycnt);
500 } else {
501 amn->amn_recovery = 0;
502 }
503 } else if (is_failure(amn)) {
504 amn->amn_success = 0;
505 if (rix > 0) {
506 if (amn->amn_recovery) {
507 amn->amn_success_threshold *= 2;
508 if (amn->amn_success_threshold >
509 amrr->amrr_max_success_threshold)
510 amn->amn_success_threshold =
511 amrr->amrr_max_success_threshold;
512 } else {
513 amn->amn_success_threshold =
514 amrr->amrr_min_success_threshold;
515 }
516 rix--;
517 /* XXX TODO: we really need a rate-to-string method */
518 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
519 "AMRR decreasing rate %d Mb (txcnt=%d retrycnt=%d)",
520 (rs->rs_rates[rix] & IEEE80211_RATE_VAL) / 2,
521 amn->amn_txcnt, amn->amn_retrycnt);
522 }
523 amn->amn_recovery = 0;
524 }
525
526 return (rix);
527 }
528
529 static int
amrr_update(struct ieee80211_amrr * amrr,struct ieee80211_amrr_node * amn,struct ieee80211_node * ni)530 amrr_update(struct ieee80211_amrr *amrr, struct ieee80211_amrr_node *amn,
531 struct ieee80211_node *ni)
532 {
533 int rix;
534
535 KASSERT(is_enough(amn), ("txcnt %d", amn->amn_txcnt));
536
537 /* Pick the right rateset */
538 if (ieee80211_vht_check_tx_vht(ni))
539 rix = amrr_update_vht(ni);
540 else if (ieee80211_ht_check_tx_ht(ni))
541 rix = amrr_update_ht(amrr, amn, ni);
542 else
543 rix = amrr_update_legacy(amrr, amn, ni);
544
545 /* reset counters */
546 amn->amn_txcnt = 0;
547 amn->amn_retrycnt = 0;
548
549 return (rix);
550 }
551
552 static int
amrr_rate_vht(struct ieee80211_node * ni)553 amrr_rate_vht(struct ieee80211_node *ni)
554 {
555 struct ieee80211_amrr *amrr = ni->ni_vap->iv_rs;
556 struct ieee80211_amrr_node *amn = ni->ni_rctls;
557
558 if (is_enough(amn) && (ticks - amn->amn_ticks) > amrr->amrr_interval)
559 amrr_update_vht(ni);
560
561 ieee80211_node_set_txrate_vht_rate(ni, amn->amn_vht_nss,
562 amn->amn_vht_mcs);
563
564 /* Note: There's no vht rs_rates, and the API doesn't use it anymore */
565 return (0);
566 }
567
568 /*
569 * Return the rate index to use in sending a data frame.
570 * Update our internal state if it's been long enough.
571 * If the rate changes we also update ni_txrate to match.
572 */
573 static int
amrr_rate(struct ieee80211_node * ni,void * arg __unused,uint32_t iarg __unused)574 amrr_rate(struct ieee80211_node *ni, void *arg __unused, uint32_t iarg __unused)
575 {
576 struct ieee80211_amrr_node *amn = ni->ni_rctls;
577 struct ieee80211_amrr *amrr;
578 const struct ieee80211_rateset *rs = NULL;
579 int rix;
580
581 /* XXX should return -1 here, but drivers may not expect this... */
582 if (!amn)
583 {
584 ieee80211_node_set_txrate_dot11rate(ni,
585 ni->ni_rates.rs_rates[0]);
586 return 0;
587 }
588
589 if (ieee80211_vht_check_tx_vht(ni))
590 return (amrr_rate_vht(ni));
591
592 /* Pick the right rateset */
593 if (ieee80211_ht_check_tx_ht(ni)) {
594 /* XXX ew */
595 rs = (struct ieee80211_rateset *) &ni->ni_htrates;
596 } else {
597 rs = &ni->ni_rates;
598 }
599
600 amrr = amn->amn_amrr;
601 if (is_enough(amn) && (ticks - amn->amn_ticks) > amrr->amrr_interval) {
602 rix = amrr_update(amrr, amn, ni);
603 if (rix != amn->amn_rix) {
604 uint8_t dot11Rate;
605 /* update public rate */
606 dot11Rate = rs->rs_rates[rix];
607 /* XXX strip basic rate flag from txrate, if non-11n */
608 if (ieee80211_ht_check_tx_ht(ni))
609 dot11Rate |= IEEE80211_RATE_MCS;
610 else
611 dot11Rate &= IEEE80211_RATE_VAL;
612 ieee80211_node_set_txrate_dot11rate(ni, dot11Rate);
613
614 amn->amn_rix = rix;
615 }
616 amn->amn_ticks = ticks;
617 } else
618 rix = amn->amn_rix;
619 return rix;
620 }
621
622 /*
623 * Update statistics with tx complete status. Ok is non-zero
624 * if the packet is known to be ACK'd. Retries has the number
625 * retransmissions (i.e. xmit attempts - 1).
626 */
627 static void
amrr_tx_complete(const struct ieee80211_node * ni,const struct ieee80211_ratectl_tx_status * status)628 amrr_tx_complete(const struct ieee80211_node *ni,
629 const struct ieee80211_ratectl_tx_status *status)
630 {
631 struct ieee80211_amrr_node *amn = ni->ni_rctls;
632 int retries;
633
634 if (!amn)
635 return;
636
637 retries = 0;
638 if (status->flags & IEEE80211_RATECTL_STATUS_LONG_RETRY)
639 retries = status->long_retries;
640
641 amn->amn_txcnt++;
642 if (status->status == IEEE80211_RATECTL_TX_SUCCESS)
643 amn->amn_success++;
644 amn->amn_retrycnt += retries;
645 }
646
647 static void
amrr_tx_update_cb(void * arg,struct ieee80211_node * ni)648 amrr_tx_update_cb(void *arg, struct ieee80211_node *ni)
649 {
650 struct ieee80211_ratectl_tx_stats *stats = arg;
651 struct ieee80211_amrr_node *amn = ni->ni_rctls;
652 int txcnt, success, retrycnt;
653
654 if (!amn)
655 return;
656
657 txcnt = stats->nframes;
658 success = stats->nsuccess;
659 retrycnt = 0;
660 if (stats->flags & IEEE80211_RATECTL_TX_STATS_RETRIES)
661 retrycnt = stats->nretries;
662
663 amn->amn_txcnt += txcnt;
664 amn->amn_success += success;
665 amn->amn_retrycnt += retrycnt;
666 }
667
668 /*
669 * Set tx count/retry statistics explicitly. Intended for
670 * drivers that poll the device for statistics maintained
671 * in the device.
672 */
673 static void
amrr_tx_update(struct ieee80211vap * vap,struct ieee80211_ratectl_tx_stats * stats)674 amrr_tx_update(struct ieee80211vap *vap,
675 struct ieee80211_ratectl_tx_stats *stats)
676 {
677
678 if (stats->flags & IEEE80211_RATECTL_TX_STATS_NODE)
679 amrr_tx_update_cb(stats, stats->ni);
680 else {
681 ieee80211_iterate_nodes_vap(&vap->iv_ic->ic_sta, vap,
682 amrr_tx_update_cb, stats);
683 }
684 }
685
686 static int
amrr_sysctl_interval(SYSCTL_HANDLER_ARGS)687 amrr_sysctl_interval(SYSCTL_HANDLER_ARGS)
688 {
689 struct ieee80211vap *vap = arg1;
690 struct ieee80211_amrr *amrr = vap->iv_rs;
691 int msecs, error;
692
693 if (!amrr)
694 return ENOMEM;
695
696 msecs = ticks_to_msecs(amrr->amrr_interval);
697 error = sysctl_handle_int(oidp, &msecs, 0, req);
698 if (error || !req->newptr)
699 return error;
700 amrr_setinterval(vap, msecs);
701 return 0;
702 }
703
704 static void
amrr_sysctlattach(struct ieee80211vap * vap,struct sysctl_ctx_list * ctx,struct sysctl_oid * tree)705 amrr_sysctlattach(struct ieee80211vap *vap,
706 struct sysctl_ctx_list *ctx, struct sysctl_oid *tree)
707 {
708 struct ieee80211_amrr *amrr = vap->iv_rs;
709
710 if (!amrr)
711 return;
712
713 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
714 "amrr_rate_interval", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
715 vap, 0, amrr_sysctl_interval, "I", "amrr operation interval (ms)");
716 /* XXX bounds check values */
717 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
718 "amrr_max_sucess_threshold", CTLFLAG_RW,
719 &amrr->amrr_max_success_threshold, 0, "");
720 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
721 "amrr_min_sucess_threshold", CTLFLAG_RW,
722 &amrr->amrr_min_success_threshold, 0, "");
723 }
724
725 static void
amrr_print_node_rate(struct ieee80211_amrr_node * amn,struct ieee80211_node * ni,struct sbuf * s)726 amrr_print_node_rate(struct ieee80211_amrr_node *amn,
727 struct ieee80211_node *ni, struct sbuf *s)
728 {
729 int rate;
730 struct ieee80211_rateset *rs;
731
732 if (ieee80211_ht_check_tx_ht(ni)) {
733 rs = (struct ieee80211_rateset *) &ni->ni_htrates;
734 rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
735 sbuf_printf(s, "rate: MCS %d\n", rate);
736 } else {
737 rs = &ni->ni_rates;
738 rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
739 sbuf_printf(s, "rate: %d Mbit\n", rate / 2);
740 }
741 }
742
743 static void
amrr_node_stats(struct ieee80211_node * ni,struct sbuf * s)744 amrr_node_stats(struct ieee80211_node *ni, struct sbuf *s)
745 {
746 struct ieee80211_amrr_node *amn = ni->ni_rctls;
747
748 /* XXX TODO: check locking? */
749
750 if (!amn)
751 return;
752
753 amrr_print_node_rate(amn, ni, s);
754 sbuf_printf(s, "ticks: %d\n", amn->amn_ticks);
755 sbuf_printf(s, "txcnt: %u\n", amn->amn_txcnt);
756 sbuf_printf(s, "success: %u\n", amn->amn_success);
757 sbuf_printf(s, "success_threshold: %u\n", amn->amn_success_threshold);
758 sbuf_printf(s, "recovery: %u\n", amn->amn_recovery);
759 sbuf_printf(s, "retry_cnt: %u\n", amn->amn_retrycnt);
760 }
761