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mac80211: make ieee80211_find_sta per virtual interface
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-3945-rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26
27 #include <linux/kernel.h>
28 #include <linux/init.h>
29 #include <linux/skbuff.h>
30 #include <linux/wireless.h>
31 #include <net/mac80211.h>
32
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
36
37 #include <linux/workqueue.h>
38
39 #include "iwl-commands.h"
40 #include "iwl-3945.h"
41 #include "iwl-sta.h"
42
43 #define RS_NAME "iwl-3945-rs"
44
45 static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT_3945] = {
46 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
47 };
48
49 static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT_3945] = {
50 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
51 };
52
53 static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT_3945] = {
54 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
55 };
56
57 static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT_3945] = {
58 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
59 };
60
61 struct iwl3945_tpt_entry {
62 s8 min_rssi;
63 u8 index;
64 };
65
66 static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = {
67 {-60, IWL_RATE_54M_INDEX},
68 {-64, IWL_RATE_48M_INDEX},
69 {-72, IWL_RATE_36M_INDEX},
70 {-80, IWL_RATE_24M_INDEX},
71 {-84, IWL_RATE_18M_INDEX},
72 {-85, IWL_RATE_12M_INDEX},
73 {-87, IWL_RATE_9M_INDEX},
74 {-89, IWL_RATE_6M_INDEX}
75 };
76
77 static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = {
78 {-60, IWL_RATE_54M_INDEX},
79 {-64, IWL_RATE_48M_INDEX},
80 {-68, IWL_RATE_36M_INDEX},
81 {-80, IWL_RATE_24M_INDEX},
82 {-84, IWL_RATE_18M_INDEX},
83 {-85, IWL_RATE_12M_INDEX},
84 {-86, IWL_RATE_11M_INDEX},
85 {-88, IWL_RATE_5M_INDEX},
86 {-90, IWL_RATE_2M_INDEX},
87 {-92, IWL_RATE_1M_INDEX}
88 };
89
90 #define IWL_RATE_MAX_WINDOW 62
91 #define IWL_RATE_FLUSH (3*HZ)
92 #define IWL_RATE_WIN_FLUSH (HZ/2)
93 #define IWL39_RATE_HIGH_TH 11520
94 #define IWL_SUCCESS_UP_TH 8960
95 #define IWL_SUCCESS_DOWN_TH 10880
96 #define IWL_RATE_MIN_FAILURE_TH 6
97 #define IWL_RATE_MIN_SUCCESS_TH 8
98 #define IWL_RATE_DECREASE_TH 1920
99 #define IWL_RATE_RETRY_TH 15
100
101 static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band)
102 {
103 u32 index = 0;
104 u32 table_size = 0;
105 struct iwl3945_tpt_entry *tpt_table = NULL;
106
107 if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
108 rssi = IWL_MIN_RSSI_VAL;
109
110 switch (band) {
111 case IEEE80211_BAND_2GHZ:
112 tpt_table = iwl3945_tpt_table_g;
113 table_size = ARRAY_SIZE(iwl3945_tpt_table_g);
114 break;
115
116 case IEEE80211_BAND_5GHZ:
117 tpt_table = iwl3945_tpt_table_a;
118 table_size = ARRAY_SIZE(iwl3945_tpt_table_a);
119 break;
120
121 default:
122 BUG();
123 break;
124 }
125
126 while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
127 index++;
128
129 index = min(index, (table_size - 1));
130
131 return tpt_table[index].index;
132 }
133
134 static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window)
135 {
136 window->data = 0;
137 window->success_counter = 0;
138 window->success_ratio = -1;
139 window->counter = 0;
140 window->average_tpt = IWL_INVALID_VALUE;
141 window->stamp = 0;
142 }
143
144 /**
145 * iwl3945_rate_scale_flush_windows - flush out the rate scale windows
146 *
147 * Returns the number of windows that have gathered data but were
148 * not flushed. If there were any that were not flushed, then
149 * reschedule the rate flushing routine.
150 */
151 static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta)
152 {
153 int unflushed = 0;
154 int i;
155 unsigned long flags;
156 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
157
158 /*
159 * For each rate, if we have collected data on that rate
160 * and it has been more than IWL_RATE_WIN_FLUSH
161 * since we flushed, clear out the gathered statistics
162 */
163 for (i = 0; i < IWL_RATE_COUNT_3945; i++) {
164 if (!rs_sta->win[i].counter)
165 continue;
166
167 spin_lock_irqsave(&rs_sta->lock, flags);
168 if (time_after(jiffies, rs_sta->win[i].stamp +
169 IWL_RATE_WIN_FLUSH)) {
170 IWL_DEBUG_RATE(priv, "flushing %d samples of rate "
171 "index %d\n",
172 rs_sta->win[i].counter, i);
173 iwl3945_clear_window(&rs_sta->win[i]);
174 } else
175 unflushed++;
176 spin_unlock_irqrestore(&rs_sta->lock, flags);
177 }
178
179 return unflushed;
180 }
181
182 #define IWL_RATE_FLUSH_MAX 5000 /* msec */
183 #define IWL_RATE_FLUSH_MIN 50 /* msec */
184 #define IWL_AVERAGE_PACKETS 1500
185
186 static void iwl3945_bg_rate_scale_flush(unsigned long data)
187 {
188 struct iwl3945_rs_sta *rs_sta = (void *)data;
189 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
190 int unflushed = 0;
191 unsigned long flags;
192 u32 packet_count, duration, pps;
193
194 IWL_DEBUG_RATE(priv, "enter\n");
195
196 unflushed = iwl3945_rate_scale_flush_windows(rs_sta);
197
198 spin_lock_irqsave(&rs_sta->lock, flags);
199
200 /* Number of packets Rx'd since last time this timer ran */
201 packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1;
202
203 rs_sta->last_tx_packets = rs_sta->tx_packets + 1;
204
205 if (unflushed) {
206 duration =
207 jiffies_to_msecs(jiffies - rs_sta->last_partial_flush);
208
209 IWL_DEBUG_RATE(priv, "Tx'd %d packets in %dms\n",
210 packet_count, duration);
211
212 /* Determine packets per second */
213 if (duration)
214 pps = (packet_count * 1000) / duration;
215 else
216 pps = 0;
217
218 if (pps) {
219 duration = (IWL_AVERAGE_PACKETS * 1000) / pps;
220 if (duration < IWL_RATE_FLUSH_MIN)
221 duration = IWL_RATE_FLUSH_MIN;
222 else if (duration > IWL_RATE_FLUSH_MAX)
223 duration = IWL_RATE_FLUSH_MAX;
224 } else
225 duration = IWL_RATE_FLUSH_MAX;
226
227 rs_sta->flush_time = msecs_to_jiffies(duration);
228
229 IWL_DEBUG_RATE(priv, "new flush period: %d msec ave %d\n",
230 duration, packet_count);
231
232 mod_timer(&rs_sta->rate_scale_flush, jiffies +
233 rs_sta->flush_time);
234
235 rs_sta->last_partial_flush = jiffies;
236 } else {
237 rs_sta->flush_time = IWL_RATE_FLUSH;
238 rs_sta->flush_pending = 0;
239 }
240 /* If there weren't any unflushed entries, we don't schedule the timer
241 * to run again */
242
243 rs_sta->last_flush = jiffies;
244
245 spin_unlock_irqrestore(&rs_sta->lock, flags);
246
247 IWL_DEBUG_RATE(priv, "leave\n");
248 }
249
250 /**
251 * iwl3945_collect_tx_data - Update the success/failure sliding window
252 *
253 * We keep a sliding window of the last 64 packets transmitted
254 * at this rate. window->data contains the bitmask of successful
255 * packets.
256 */
257 static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta,
258 struct iwl3945_rate_scale_data *window,
259 int success, int retries, int index)
260 {
261 unsigned long flags;
262 s32 fail_count;
263 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
264
265 if (!retries) {
266 IWL_DEBUG_RATE(priv, "leave: retries == 0 -- should be at least 1\n");
267 return;
268 }
269
270 spin_lock_irqsave(&rs_sta->lock, flags);
271
272 /*
273 * Keep track of only the latest 62 tx frame attempts in this rate's
274 * history window; anything older isn't really relevant any more.
275 * If we have filled up the sliding window, drop the oldest attempt;
276 * if the oldest attempt (highest bit in bitmap) shows "success",
277 * subtract "1" from the success counter (this is the main reason
278 * we keep these bitmaps!).
279 * */
280 while (retries > 0) {
281 if (window->counter >= IWL_RATE_MAX_WINDOW) {
282
283 /* remove earliest */
284 window->counter = IWL_RATE_MAX_WINDOW - 1;
285
286 if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) {
287 window->data &= ~(1ULL << (IWL_RATE_MAX_WINDOW - 1));
288 window->success_counter--;
289 }
290 }
291
292 /* Increment frames-attempted counter */
293 window->counter++;
294
295 /* Shift bitmap by one frame (throw away oldest history),
296 * OR in "1", and increment "success" if this
297 * frame was successful. */
298 window->data <<= 1;
299 if (success > 0) {
300 window->success_counter++;
301 window->data |= 0x1;
302 success--;
303 }
304
305 retries--;
306 }
307
308 /* Calculate current success ratio, avoid divide-by-0! */
309 if (window->counter > 0)
310 window->success_ratio = 128 * (100 * window->success_counter)
311 / window->counter;
312 else
313 window->success_ratio = IWL_INVALID_VALUE;
314
315 fail_count = window->counter - window->success_counter;
316
317 /* Calculate average throughput, if we have enough history. */
318 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
319 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
320 window->average_tpt = ((window->success_ratio *
321 rs_sta->expected_tpt[index] + 64) / 128);
322 else
323 window->average_tpt = IWL_INVALID_VALUE;
324
325 /* Tag this window as having been updated */
326 window->stamp = jiffies;
327
328 spin_unlock_irqrestore(&rs_sta->lock, flags);
329
330 }
331
332 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
333 struct ieee80211_sta *sta, void *priv_sta)
334 {
335 struct iwl3945_rs_sta *rs_sta = priv_sta;
336 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
337 int i;
338
339 IWL_DEBUG_RATE(priv, "enter\n");
340
341 spin_lock_init(&rs_sta->lock);
342
343 rs_sta->priv = priv;
344
345 rs_sta->start_rate = IWL_RATE_INVALID;
346
347 /* default to just 802.11b */
348 rs_sta->expected_tpt = iwl3945_expected_tpt_b;
349
350 rs_sta->last_partial_flush = jiffies;
351 rs_sta->last_flush = jiffies;
352 rs_sta->flush_time = IWL_RATE_FLUSH;
353 rs_sta->last_tx_packets = 0;
354 rs_sta->ibss_sta_added = 0;
355
356 init_timer(&rs_sta->rate_scale_flush);
357 rs_sta->rate_scale_flush.data = (unsigned long)rs_sta;
358 rs_sta->rate_scale_flush.function = &iwl3945_bg_rate_scale_flush;
359
360 for (i = 0; i < IWL_RATE_COUNT_3945; i++)
361 iwl3945_clear_window(&rs_sta->win[i]);
362
363 /* TODO: what is a good starting rate for STA? About middle? Maybe not
364 * the lowest or the highest rate.. Could consider using RSSI from
365 * previous packets? Need to have IEEE 802.1X auth succeed immediately
366 * after assoc.. */
367
368 for (i = sband->n_bitrates - 1; i >= 0; i--) {
369 if (sta->supp_rates[sband->band] & (1 << i)) {
370 rs_sta->last_txrate_idx = i;
371 break;
372 }
373 }
374
375 priv->sta_supp_rates = sta->supp_rates[sband->band];
376 /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */
377 if (sband->band == IEEE80211_BAND_5GHZ) {
378 rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
379 priv->sta_supp_rates = priv->sta_supp_rates <<
380 IWL_FIRST_OFDM_RATE;
381 }
382
383
384 IWL_DEBUG_RATE(priv, "leave\n");
385 }
386
387 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
388 {
389 return hw->priv;
390 }
391
392 /* rate scale requires free function to be implemented */
393 static void rs_free(void *priv)
394 {
395 return;
396 }
397
398 static void *rs_alloc_sta(void *iwl_priv, struct ieee80211_sta *sta, gfp_t gfp)
399 {
400 struct iwl3945_rs_sta *rs_sta;
401 struct iwl3945_sta_priv *psta = (void *) sta->drv_priv;
402 struct iwl_priv *priv __maybe_unused = iwl_priv;
403
404 IWL_DEBUG_RATE(priv, "enter\n");
405
406 rs_sta = &psta->rs_sta;
407
408 IWL_DEBUG_RATE(priv, "leave\n");
409
410 return rs_sta;
411 }
412
413 static void rs_free_sta(void *iwl_priv, struct ieee80211_sta *sta,
414 void *priv_sta)
415 {
416 struct iwl3945_sta_priv *psta = (void *) sta->drv_priv;
417 struct iwl3945_rs_sta *rs_sta = &psta->rs_sta;
418 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
419
420 IWL_DEBUG_RATE(priv, "enter\n");
421 del_timer_sync(&rs_sta->rate_scale_flush);
422 IWL_DEBUG_RATE(priv, "leave\n");
423 }
424
425
426 /**
427 * rs_tx_status - Update rate control values based on Tx results
428 *
429 * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by
430 * the hardware for each rate.
431 */
432 static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband,
433 struct ieee80211_sta *sta, void *priv_sta,
434 struct sk_buff *skb)
435 {
436 s8 retries = 0, current_count;
437 int scale_rate_index, first_index, last_index;
438 unsigned long flags;
439 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
440 struct iwl3945_rs_sta *rs_sta = priv_sta;
441 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
442
443 IWL_DEBUG_RATE(priv, "enter\n");
444
445 retries = info->status.rates[0].count;
446 /* Sanity Check for retries */
447 if (retries > IWL_RATE_RETRY_TH)
448 retries = IWL_RATE_RETRY_TH;
449
450 first_index = sband->bitrates[info->status.rates[0].idx].hw_value;
451 if ((first_index < 0) || (first_index >= IWL_RATE_COUNT_3945)) {
452 IWL_DEBUG_RATE(priv, "leave: Rate out of bounds: %d\n", first_index);
453 return;
454 }
455
456 if (!priv_sta) {
457 IWL_DEBUG_RATE(priv, "leave: No STA priv data to update!\n");
458 return;
459 }
460
461 rs_sta->tx_packets++;
462
463 scale_rate_index = first_index;
464 last_index = first_index;
465
466 /*
467 * Update the window for each rate. We determine which rates
468 * were Tx'd based on the total number of retries vs. the number
469 * of retries configured for each rate -- currently set to the
470 * priv value 'retry_rate' vs. rate specific
471 *
472 * On exit from this while loop last_index indicates the rate
473 * at which the frame was finally transmitted (or failed if no
474 * ACK)
475 */
476 while (retries > 1) {
477 if ((retries - 1) < priv->retry_rate) {
478 current_count = (retries - 1);
479 last_index = scale_rate_index;
480 } else {
481 current_count = priv->retry_rate;
482 last_index = iwl3945_rs_next_rate(priv,
483 scale_rate_index);
484 }
485
486 /* Update this rate accounting for as many retries
487 * as was used for it (per current_count) */
488 iwl3945_collect_tx_data(rs_sta,
489 &rs_sta->win[scale_rate_index],
490 0, current_count, scale_rate_index);
491 IWL_DEBUG_RATE(priv, "Update rate %d for %d retries.\n",
492 scale_rate_index, current_count);
493
494 retries -= current_count;
495
496 scale_rate_index = last_index;
497 }
498
499
500 /* Update the last index window with success/failure based on ACK */
501 IWL_DEBUG_RATE(priv, "Update rate %d with %s.\n",
502 last_index,
503 (info->flags & IEEE80211_TX_STAT_ACK) ?
504 "success" : "failure");
505 iwl3945_collect_tx_data(rs_sta,
506 &rs_sta->win[last_index],
507 info->flags & IEEE80211_TX_STAT_ACK, 1, last_index);
508
509 /* We updated the rate scale window -- if its been more than
510 * flush_time since the last run, schedule the flush
511 * again */
512 spin_lock_irqsave(&rs_sta->lock, flags);
513
514 if (!rs_sta->flush_pending &&
515 time_after(jiffies, rs_sta->last_flush +
516 rs_sta->flush_time)) {
517
518 rs_sta->last_partial_flush = jiffies;
519 rs_sta->flush_pending = 1;
520 mod_timer(&rs_sta->rate_scale_flush,
521 jiffies + rs_sta->flush_time);
522 }
523
524 spin_unlock_irqrestore(&rs_sta->lock, flags);
525
526 IWL_DEBUG_RATE(priv, "leave\n");
527
528 return;
529 }
530
531 static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta,
532 u8 index, u16 rate_mask, enum ieee80211_band band)
533 {
534 u8 high = IWL_RATE_INVALID;
535 u8 low = IWL_RATE_INVALID;
536 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
537
538 /* 802.11A walks to the next literal adjacent rate in
539 * the rate table */
540 if (unlikely(band == IEEE80211_BAND_5GHZ)) {
541 int i;
542 u32 mask;
543
544 /* Find the previous rate that is in the rate mask */
545 i = index - 1;
546 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
547 if (rate_mask & mask) {
548 low = i;
549 break;
550 }
551 }
552
553 /* Find the next rate that is in the rate mask */
554 i = index + 1;
555 for (mask = (1 << i); i < IWL_RATE_COUNT_3945;
556 i++, mask <<= 1) {
557 if (rate_mask & mask) {
558 high = i;
559 break;
560 }
561 }
562
563 return (high << 8) | low;
564 }
565
566 low = index;
567 while (low != IWL_RATE_INVALID) {
568 if (rs_sta->tgg)
569 low = iwl3945_rates[low].prev_rs_tgg;
570 else
571 low = iwl3945_rates[low].prev_rs;
572 if (low == IWL_RATE_INVALID)
573 break;
574 if (rate_mask & (1 << low))
575 break;
576 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
577 }
578
579 high = index;
580 while (high != IWL_RATE_INVALID) {
581 if (rs_sta->tgg)
582 high = iwl3945_rates[high].next_rs_tgg;
583 else
584 high = iwl3945_rates[high].next_rs;
585 if (high == IWL_RATE_INVALID)
586 break;
587 if (rate_mask & (1 << high))
588 break;
589 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
590 }
591
592 return (high << 8) | low;
593 }
594
595 /**
596 * rs_get_rate - find the rate for the requested packet
597 *
598 * Returns the ieee80211_rate structure allocated by the driver.
599 *
600 * The rate control algorithm has no internal mapping between hw_mode's
601 * rate ordering and the rate ordering used by the rate control algorithm.
602 *
603 * The rate control algorithm uses a single table of rates that goes across
604 * the entire A/B/G spectrum vs. being limited to just one particular
605 * hw_mode.
606 *
607 * As such, we can't convert the index obtained below into the hw_mode's
608 * rate table and must reference the driver allocated rate table
609 *
610 */
611 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta,
612 void *priv_sta, struct ieee80211_tx_rate_control *txrc)
613 {
614 struct ieee80211_supported_band *sband = txrc->sband;
615 struct sk_buff *skb = txrc->skb;
616 u8 low = IWL_RATE_INVALID;
617 u8 high = IWL_RATE_INVALID;
618 u16 high_low;
619 int index;
620 struct iwl3945_rs_sta *rs_sta = priv_sta;
621 struct iwl3945_rate_scale_data *window = NULL;
622 int current_tpt = IWL_INVALID_VALUE;
623 int low_tpt = IWL_INVALID_VALUE;
624 int high_tpt = IWL_INVALID_VALUE;
625 u32 fail_count;
626 s8 scale_action = 0;
627 unsigned long flags;
628 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
629 u16 rate_mask = sta ? sta->supp_rates[sband->band] : 0;
630 s8 max_rate_idx = -1;
631 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
632 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
633
634 IWL_DEBUG_RATE(priv, "enter\n");
635
636 if (rate_control_send_low(sta, priv_sta, txrc))
637 return;
638
639 rate_mask = sta->supp_rates[sband->band];
640
641 /* get user max rate if set */
642 max_rate_idx = txrc->max_rate_idx;
643 if ((sband->band == IEEE80211_BAND_5GHZ) && (max_rate_idx != -1))
644 max_rate_idx += IWL_FIRST_OFDM_RATE;
645 if ((max_rate_idx < 0) || (max_rate_idx >= IWL_RATE_COUNT))
646 max_rate_idx = -1;
647
648 index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT_3945 - 1);
649
650 if (sband->band == IEEE80211_BAND_5GHZ)
651 rate_mask = rate_mask << IWL_FIRST_OFDM_RATE;
652
653 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
654 !rs_sta->ibss_sta_added) {
655 u8 sta_id = iwl_find_station(priv, hdr->addr1);
656
657 if (sta_id == IWL_INVALID_STATION) {
658 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
659 hdr->addr1);
660 sta_id = iwl_add_station(priv, hdr->addr1, false,
661 CMD_ASYNC, NULL);
662 }
663 if (sta_id != IWL_INVALID_STATION)
664 rs_sta->ibss_sta_added = 1;
665 }
666
667 spin_lock_irqsave(&rs_sta->lock, flags);
668
669 /* for recent assoc, choose best rate regarding
670 * to rssi value
671 */
672 if (rs_sta->start_rate != IWL_RATE_INVALID) {
673 if (rs_sta->start_rate < index &&
674 (rate_mask & (1 << rs_sta->start_rate)))
675 index = rs_sta->start_rate;
676 rs_sta->start_rate = IWL_RATE_INVALID;
677 }
678
679 /* force user max rate if set by user */
680 if ((max_rate_idx != -1) && (max_rate_idx < index)) {
681 if (rate_mask & (1 << max_rate_idx))
682 index = max_rate_idx;
683 }
684
685 window = &(rs_sta->win[index]);
686
687 fail_count = window->counter - window->success_counter;
688
689 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
690 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
691 spin_unlock_irqrestore(&rs_sta->lock, flags);
692
693 IWL_DEBUG_RATE(priv, "Invalid average_tpt on rate %d: "
694 "counter: %d, success_counter: %d, "
695 "expected_tpt is %sNULL\n",
696 index,
697 window->counter,
698 window->success_counter,
699 rs_sta->expected_tpt ? "not " : "");
700
701 /* Can't calculate this yet; not enough history */
702 window->average_tpt = IWL_INVALID_VALUE;
703 goto out;
704
705 }
706
707 current_tpt = window->average_tpt;
708
709 high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask,
710 sband->band);
711 low = high_low & 0xff;
712 high = (high_low >> 8) & 0xff;
713
714 /* If user set max rate, dont allow higher than user constrain */
715 if ((max_rate_idx != -1) && (max_rate_idx < high))
716 high = IWL_RATE_INVALID;
717
718 /* Collect Measured throughputs of adjacent rates */
719 if (low != IWL_RATE_INVALID)
720 low_tpt = rs_sta->win[low].average_tpt;
721
722 if (high != IWL_RATE_INVALID)
723 high_tpt = rs_sta->win[high].average_tpt;
724
725 spin_unlock_irqrestore(&rs_sta->lock, flags);
726
727 scale_action = 0;
728
729 /* Low success ratio , need to drop the rate */
730 if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
731 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
732 scale_action = -1;
733 /* No throughput measured yet for adjacent rates,
734 * try increase */
735 } else if ((low_tpt == IWL_INVALID_VALUE) &&
736 (high_tpt == IWL_INVALID_VALUE)) {
737
738 if (high != IWL_RATE_INVALID && window->success_ratio >= IWL_RATE_INCREASE_TH)
739 scale_action = 1;
740 else if (low != IWL_RATE_INVALID)
741 scale_action = 0;
742
743 /* Both adjacent throughputs are measured, but neither one has
744 * better throughput; we're using the best rate, don't change
745 * it! */
746 } else if ((low_tpt != IWL_INVALID_VALUE) &&
747 (high_tpt != IWL_INVALID_VALUE) &&
748 (low_tpt < current_tpt) && (high_tpt < current_tpt)) {
749
750 IWL_DEBUG_RATE(priv, "No action -- low [%d] & high [%d] < "
751 "current_tpt [%d]\n",
752 low_tpt, high_tpt, current_tpt);
753 scale_action = 0;
754
755 /* At least one of the rates has better throughput */
756 } else {
757 if (high_tpt != IWL_INVALID_VALUE) {
758
759 /* High rate has better throughput, Increase
760 * rate */
761 if (high_tpt > current_tpt &&
762 window->success_ratio >= IWL_RATE_INCREASE_TH)
763 scale_action = 1;
764 else {
765 IWL_DEBUG_RATE(priv,
766 "decrease rate because of high tpt\n");
767 scale_action = 0;
768 }
769 } else if (low_tpt != IWL_INVALID_VALUE) {
770 if (low_tpt > current_tpt) {
771 IWL_DEBUG_RATE(priv,
772 "decrease rate because of low tpt\n");
773 scale_action = -1;
774 } else if (window->success_ratio >= IWL_RATE_INCREASE_TH) {
775 /* Lower rate has better
776 * throughput,decrease rate */
777 scale_action = 1;
778 }
779 }
780 }
781
782 /* Sanity check; asked for decrease, but success rate or throughput
783 * has been good at old rate. Don't change it. */
784 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
785 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
786 (current_tpt > (100 * rs_sta->expected_tpt[low]))))
787 scale_action = 0;
788
789 switch (scale_action) {
790 case -1:
791
792 /* Decrese rate */
793 if (low != IWL_RATE_INVALID)
794 index = low;
795 break;
796
797 case 1:
798 /* Increase rate */
799 if (high != IWL_RATE_INVALID)
800 index = high;
801
802 break;
803
804 case 0:
805 default:
806 /* No change */
807 break;
808 }
809
810 IWL_DEBUG_RATE(priv, "Selected %d (action %d) - low %d high %d\n",
811 index, scale_action, low, high);
812
813 out:
814
815 rs_sta->last_txrate_idx = index;
816 if (sband->band == IEEE80211_BAND_5GHZ)
817 info->control.rates[0].idx = rs_sta->last_txrate_idx -
818 IWL_FIRST_OFDM_RATE;
819 else
820 info->control.rates[0].idx = rs_sta->last_txrate_idx;
821
822 IWL_DEBUG_RATE(priv, "leave: %d\n", index);
823 }
824
825 #ifdef CONFIG_MAC80211_DEBUGFS
826 static int iwl3945_open_file_generic(struct inode *inode, struct file *file)
827 {
828 file->private_data = inode->i_private;
829 return 0;
830 }
831
832 static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file,
833 char __user *user_buf,
834 size_t count, loff_t *ppos)
835 {
836 char *buff;
837 int desc = 0;
838 int j;
839 ssize_t ret;
840 struct iwl3945_rs_sta *lq_sta = file->private_data;
841
842 buff = kmalloc(1024, GFP_KERNEL);
843 if (!buff)
844 return -ENOMEM;
845
846 desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n"
847 "rate=0x%X flush time %d\n",
848 lq_sta->tx_packets,
849 lq_sta->last_txrate_idx,
850 lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time));
851 for (j = 0; j < IWL_RATE_COUNT_3945; j++) {
852 desc += sprintf(buff+desc,
853 "counter=%d success=%d %%=%d\n",
854 lq_sta->win[j].counter,
855 lq_sta->win[j].success_counter,
856 lq_sta->win[j].success_ratio);
857 }
858 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
859 kfree(buff);
860 return ret;
861 }
862
863 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
864 .read = iwl3945_sta_dbgfs_stats_table_read,
865 .open = iwl3945_open_file_generic,
866 };
867
868 static void iwl3945_add_debugfs(void *priv, void *priv_sta,
869 struct dentry *dir)
870 {
871 struct iwl3945_rs_sta *lq_sta = priv_sta;
872
873 lq_sta->rs_sta_dbgfs_stats_table_file =
874 debugfs_create_file("rate_stats_table", 0600, dir,
875 lq_sta, &rs_sta_dbgfs_stats_table_ops);
876
877 }
878
879 static void iwl3945_remove_debugfs(void *priv, void *priv_sta)
880 {
881 struct iwl3945_rs_sta *lq_sta = priv_sta;
882 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
883 }
884 #endif
885
886 static struct rate_control_ops rs_ops = {
887 .module = NULL,
888 .name = RS_NAME,
889 .tx_status = rs_tx_status,
890 .get_rate = rs_get_rate,
891 .rate_init = rs_rate_init,
892 .alloc = rs_alloc,
893 .free = rs_free,
894 .alloc_sta = rs_alloc_sta,
895 .free_sta = rs_free_sta,
896 #ifdef CONFIG_MAC80211_DEBUGFS
897 .add_sta_debugfs = iwl3945_add_debugfs,
898 .remove_sta_debugfs = iwl3945_remove_debugfs,
899 #endif
900
901 };
902
903 void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
904 {
905 struct iwl_priv *priv = hw->priv;
906 s32 rssi = 0;
907 unsigned long flags;
908 struct iwl3945_rs_sta *rs_sta;
909 struct ieee80211_sta *sta;
910 struct iwl3945_sta_priv *psta;
911
912 IWL_DEBUG_RATE(priv, "enter\n");
913
914 rcu_read_lock();
915
916 sta = ieee80211_find_sta(priv->vif,
917 priv->stations[sta_id].sta.sta.addr);
918 if (!sta) {
919 rcu_read_unlock();
920 return;
921 }
922
923 psta = (void *) sta->drv_priv;
924 rs_sta = &psta->rs_sta;
925
926 spin_lock_irqsave(&rs_sta->lock, flags);
927
928 rs_sta->tgg = 0;
929 switch (priv->band) {
930 case IEEE80211_BAND_2GHZ:
931 /* TODO: this always does G, not a regression */
932 if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
933 rs_sta->tgg = 1;
934 rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot;
935 } else
936 rs_sta->expected_tpt = iwl3945_expected_tpt_g;
937 break;
938
939 case IEEE80211_BAND_5GHZ:
940 rs_sta->expected_tpt = iwl3945_expected_tpt_a;
941 break;
942 case IEEE80211_NUM_BANDS:
943 BUG();
944 break;
945 }
946
947 spin_unlock_irqrestore(&rs_sta->lock, flags);
948
949 rssi = priv->last_rx_rssi;
950 if (rssi == 0)
951 rssi = IWL_MIN_RSSI_VAL;
952
953 IWL_DEBUG_RATE(priv, "Network RSSI: %d\n", rssi);
954
955 rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band);
956
957 IWL_DEBUG_RATE(priv, "leave: rssi %d assign rate index: "
958 "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate,
959 iwl3945_rates[rs_sta->start_rate].plcp);
960 rcu_read_unlock();
961 }
962
963 int iwl3945_rate_control_register(void)
964 {
965 return ieee80211_rate_control_register(&rs_ops);
966 }
967
968 void iwl3945_rate_control_unregister(void)
969 {
970 ieee80211_rate_control_unregister(&rs_ops);
971 }
972
973
Linux kernel - Deliverables
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