Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-3.10.git] / drivers / net / wireless / iwlwifi / iwl-3945-rs.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2005 - 2007 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  * James P. Ketrenos <ipw2100-admin@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 #include <net/ieee80211.h>
33
34 #include <linux/netdevice.h>
35 #include <linux/etherdevice.h>
36 #include <linux/delay.h>
37
38 #include <linux/workqueue.h>
39
40 #define IWL 3945
41
42 #include "../net/mac80211/ieee80211_rate.h"
43
44 #include "iwlwifi.h"
45
46 #define RS_NAME "iwl-3945-rs"
47
48 struct iwl_rate_scale_data {
49         u64 data;
50         s32 success_counter;
51         s32 success_ratio;
52         s32 counter;
53         s32 average_tpt;
54         unsigned long stamp;
55 };
56
57 struct iwl_rate_scale_priv {
58         spinlock_t lock;
59         s32 *expected_tpt;
60         unsigned long last_partial_flush;
61         unsigned long last_flush;
62         u32 flush_time;
63         u32 last_tx_packets;
64         u32 tx_packets;
65         u8 tgg;
66         u8 flush_pending;
67         u8 start_rate;
68         u8 ibss_sta_added;
69         struct timer_list rate_scale_flush;
70         struct iwl_rate_scale_data win[IWL_RATE_COUNT];
71 };
72
73 static s32 iwl_expected_tpt_g[IWL_RATE_COUNT] = {
74         7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
75 };
76
77 static s32 iwl_expected_tpt_g_prot[IWL_RATE_COUNT] = {
78         7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
79 };
80
81 static s32 iwl_expected_tpt_a[IWL_RATE_COUNT] = {
82         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
83 };
84
85 static s32 iwl_expected_tpt_b[IWL_RATE_COUNT] = {
86         7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
87 };
88
89 struct iwl_tpt_entry {
90         s8 min_rssi;
91         u8 index;
92 };
93
94 static struct iwl_tpt_entry iwl_tpt_table_a[] = {
95         {-60, IWL_RATE_54M_INDEX},
96         {-64, IWL_RATE_48M_INDEX},
97         {-72, IWL_RATE_36M_INDEX},
98         {-80, IWL_RATE_24M_INDEX},
99         {-84, IWL_RATE_18M_INDEX},
100         {-85, IWL_RATE_12M_INDEX},
101         {-87, IWL_RATE_9M_INDEX},
102         {-89, IWL_RATE_6M_INDEX}
103 };
104
105 static struct iwl_tpt_entry iwl_tpt_table_b[] = {
106         {-86, IWL_RATE_11M_INDEX},
107         {-88, IWL_RATE_5M_INDEX},
108         {-90, IWL_RATE_2M_INDEX},
109         {-92, IWL_RATE_1M_INDEX}
110
111 };
112
113 static struct iwl_tpt_entry iwl_tpt_table_g[] = {
114         {-60, IWL_RATE_54M_INDEX},
115         {-64, IWL_RATE_48M_INDEX},
116         {-68, IWL_RATE_36M_INDEX},
117         {-80, IWL_RATE_24M_INDEX},
118         {-84, IWL_RATE_18M_INDEX},
119         {-85, IWL_RATE_12M_INDEX},
120         {-86, IWL_RATE_11M_INDEX},
121         {-88, IWL_RATE_5M_INDEX},
122         {-90, IWL_RATE_2M_INDEX},
123         {-92, IWL_RATE_1M_INDEX}
124 };
125
126 #define IWL_RATE_MAX_WINDOW          62
127 #define IWL_RATE_FLUSH        (3*HZ/10)
128 #define IWL_RATE_WIN_FLUSH       (HZ/2)
129 #define IWL_RATE_HIGH_TH          11520
130 #define IWL_RATE_MIN_FAILURE_TH       8
131 #define IWL_RATE_MIN_SUCCESS_TH       8
132 #define IWL_RATE_DECREASE_TH       1920
133
134 static u8 iwl_get_rate_index_by_rssi(s32 rssi, u8 mode)
135 {
136         u32 index = 0;
137         u32 table_size = 0;
138         struct iwl_tpt_entry *tpt_table = NULL;
139
140         if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
141                 rssi = IWL_MIN_RSSI_VAL;
142
143         switch (mode) {
144         case MODE_IEEE80211G:
145                 tpt_table = iwl_tpt_table_g;
146                 table_size = ARRAY_SIZE(iwl_tpt_table_g);
147                 break;
148
149         case MODE_IEEE80211A:
150                 tpt_table = iwl_tpt_table_a;
151                 table_size = ARRAY_SIZE(iwl_tpt_table_a);
152                 break;
153
154         default:
155         case MODE_IEEE80211B:
156                 tpt_table = iwl_tpt_table_b;
157                 table_size = ARRAY_SIZE(iwl_tpt_table_b);
158                 break;
159         }
160
161         while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
162                 index++;
163
164         index = min(index, (table_size - 1));
165
166         return tpt_table[index].index;
167 }
168
169 static void iwl_clear_window(struct iwl_rate_scale_data *window)
170 {
171         window->data = 0;
172         window->success_counter = 0;
173         window->success_ratio = IWL_INVALID_VALUE;
174         window->counter = 0;
175         window->average_tpt = IWL_INVALID_VALUE;
176         window->stamp = 0;
177 }
178
179 /**
180  * iwl_rate_scale_flush_windows - flush out the rate scale windows
181  *
182  * Returns the number of windows that have gathered data but were
183  * not flushed.  If there were any that were not flushed, then
184  * reschedule the rate flushing routine.
185  */
186 static int iwl_rate_scale_flush_windows(struct iwl_rate_scale_priv *rs_priv)
187 {
188         int unflushed = 0;
189         int i;
190         unsigned long flags;
191
192         /*
193          * For each rate, if we have collected data on that rate
194          * and it has been more than IWL_RATE_WIN_FLUSH
195          * since we flushed, clear out the gathered statistics
196          */
197         for (i = 0; i < IWL_RATE_COUNT; i++) {
198                 if (!rs_priv->win[i].counter)
199                         continue;
200
201                 spin_lock_irqsave(&rs_priv->lock, flags);
202                 if (time_after(jiffies, rs_priv->win[i].stamp +
203                                IWL_RATE_WIN_FLUSH)) {
204                         IWL_DEBUG_RATE("flushing %d samples of rate "
205                                        "index %d\n",
206                                        rs_priv->win[i].counter, i);
207                         iwl_clear_window(&rs_priv->win[i]);
208                 } else
209                         unflushed++;
210                 spin_unlock_irqrestore(&rs_priv->lock, flags);
211         }
212
213         return unflushed;
214 }
215
216 #define IWL_RATE_FLUSH_MAX              5000    /* msec */
217 #define IWL_RATE_FLUSH_MIN              50      /* msec */
218
219 static void iwl_bg_rate_scale_flush(unsigned long data)
220 {
221         struct iwl_rate_scale_priv *rs_priv = (void *)data;
222         int unflushed = 0;
223         unsigned long flags;
224         u32 packet_count, duration, pps;
225
226         IWL_DEBUG_RATE("enter\n");
227
228         unflushed = iwl_rate_scale_flush_windows(rs_priv);
229
230         spin_lock_irqsave(&rs_priv->lock, flags);
231
232         rs_priv->flush_pending = 0;
233
234         /* Number of packets Rx'd since last time this timer ran */
235         packet_count = (rs_priv->tx_packets - rs_priv->last_tx_packets) + 1;
236
237         rs_priv->last_tx_packets = rs_priv->tx_packets + 1;
238
239         if (unflushed) {
240                 duration =
241                     jiffies_to_msecs(jiffies - rs_priv->last_partial_flush);
242 /*              duration = jiffies_to_msecs(rs_priv->flush_time); */
243
244                 IWL_DEBUG_RATE("Tx'd %d packets in %dms\n",
245                                packet_count, duration);
246
247                 /* Determine packets per second */
248                 if (duration)
249                         pps = (packet_count * 1000) / duration;
250                 else
251                         pps = 0;
252
253                 if (pps) {
254                         duration = IWL_RATE_FLUSH_MAX / pps;
255                         if (duration < IWL_RATE_FLUSH_MIN)
256                                 duration = IWL_RATE_FLUSH_MIN;
257                 } else
258                         duration = IWL_RATE_FLUSH_MAX;
259
260                 rs_priv->flush_time = msecs_to_jiffies(duration);
261
262                 IWL_DEBUG_RATE("new flush period: %d msec ave %d\n",
263                                duration, packet_count);
264
265                 mod_timer(&rs_priv->rate_scale_flush, jiffies +
266                           rs_priv->flush_time);
267
268                 rs_priv->last_partial_flush = jiffies;
269         }
270
271         /* If there weren't any unflushed entries, we don't schedule the timer
272          * to run again */
273
274         rs_priv->last_flush = jiffies;
275
276         spin_unlock_irqrestore(&rs_priv->lock, flags);
277
278         IWL_DEBUG_RATE("leave\n");
279 }
280
281 /**
282  * iwl_collect_tx_data - Update the success/failure sliding window
283  *
284  * We keep a sliding window of the last 64 packets transmitted
285  * at this rate.  window->data contains the bitmask of successful
286  * packets.
287  */
288 static void iwl_collect_tx_data(struct iwl_rate_scale_priv *rs_priv,
289                                 struct iwl_rate_scale_data *window,
290                                 int success, int retries)
291 {
292         unsigned long flags;
293
294         if (!retries) {
295                 IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n");
296                 return;
297         }
298
299         while (retries--) {
300                 spin_lock_irqsave(&rs_priv->lock, flags);
301
302                 /* If we have filled up the window then subtract one from the
303                  * success counter if the high-bit is counting toward
304                  * success */
305                 if (window->counter == IWL_RATE_MAX_WINDOW) {
306                         if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1)))
307                                 window->success_counter--;
308                 } else
309                         window->counter++;
310
311                 /* Slide the window to the left one bit */
312                 window->data = (window->data << 1);
313
314                 /* If this packet was a success then set the low bit high */
315                 if (success) {
316                         window->success_counter++;
317                         window->data |= 1;
318                 }
319
320                 /* window->counter can't be 0 -- it is either >0 or
321                  * IWL_RATE_MAX_WINDOW */
322                 window->success_ratio = 12800 * window->success_counter /
323                     window->counter;
324
325                 /* Tag this window as having been updated */
326                 window->stamp = jiffies;
327
328                 spin_unlock_irqrestore(&rs_priv->lock, flags);
329         }
330 }
331
332 static void rs_rate_init(void *priv_rate, void *priv_sta,
333                          struct ieee80211_local *local, struct sta_info *sta)
334 {
335         int i;
336
337         IWL_DEBUG_RATE("enter\n");
338
339         /* TODO: what is a good starting rate for STA? About middle? Maybe not
340          * the lowest or the highest rate.. Could consider using RSSI from
341          * previous packets? Need to have IEEE 802.1X auth succeed immediately
342          * after assoc.. */
343
344         for (i = IWL_RATE_COUNT - 1; i >= 0; i--) {
345                 if (sta->supp_rates & (1 << i)) {
346                         sta->txrate = i;
347                         break;
348                 }
349         }
350
351         sta->last_txrate = sta->txrate;
352
353         /* For MODE_IEEE80211A mode it start at IWL_FIRST_OFDM_RATE */
354         if (local->hw.conf.phymode == MODE_IEEE80211A)
355                 sta->last_txrate += IWL_FIRST_OFDM_RATE;
356
357         IWL_DEBUG_RATE("leave\n");
358 }
359
360 static void *rs_alloc(struct ieee80211_local *local)
361 {
362         return local->hw.priv;
363 }
364
365 /* rate scale requires free function to be implmented */
366 static void rs_free(void *priv)
367 {
368         return;
369 }
370 static void rs_clear(void *priv)
371 {
372         return;
373 }
374
375
376 static void *rs_alloc_sta(void *priv, gfp_t gfp)
377 {
378         struct iwl_rate_scale_priv *rs_priv;
379         int i;
380
381         IWL_DEBUG_RATE("enter\n");
382
383         rs_priv = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
384         if (!rs_priv) {
385                 IWL_DEBUG_RATE("leave: ENOMEM\n");
386                 return NULL;
387         }
388
389         spin_lock_init(&rs_priv->lock);
390
391         rs_priv->start_rate = IWL_RATE_INVALID;
392
393         /* default to just 802.11b */
394         rs_priv->expected_tpt = iwl_expected_tpt_b;
395
396         rs_priv->last_partial_flush = jiffies;
397         rs_priv->last_flush = jiffies;
398         rs_priv->flush_time = IWL_RATE_FLUSH;
399         rs_priv->last_tx_packets = 0;
400         rs_priv->ibss_sta_added = 0;
401
402         init_timer(&rs_priv->rate_scale_flush);
403         rs_priv->rate_scale_flush.data = (unsigned long)rs_priv;
404         rs_priv->rate_scale_flush.function = &iwl_bg_rate_scale_flush;
405
406         for (i = 0; i < IWL_RATE_COUNT; i++)
407                 iwl_clear_window(&rs_priv->win[i]);
408
409         IWL_DEBUG_RATE("leave\n");
410
411         return rs_priv;
412 }
413
414 static void rs_free_sta(void *priv, void *priv_sta)
415 {
416         struct iwl_rate_scale_priv *rs_priv = priv_sta;
417
418         IWL_DEBUG_RATE("enter\n");
419         del_timer_sync(&rs_priv->rate_scale_flush);
420         kfree(rs_priv);
421         IWL_DEBUG_RATE("leave\n");
422 }
423
424
425 /*
426  * get ieee prev rate from rate scale table.
427  * for A and B mode we need to overright prev
428  * value
429  */
430 static int rs_adjust_next_rate(struct iwl_priv *priv, int rate)
431 {
432         int next_rate = iwl_get_prev_ieee_rate(rate);
433
434         switch (priv->phymode) {
435         case MODE_IEEE80211A:
436                 if (rate == IWL_RATE_12M_INDEX)
437                         next_rate = IWL_RATE_9M_INDEX;
438                 else if (rate == IWL_RATE_6M_INDEX)
439                         next_rate = IWL_RATE_6M_INDEX;
440                 break;
441         case MODE_IEEE80211B:
442                 if (rate == IWL_RATE_11M_INDEX_TABLE)
443                         next_rate = IWL_RATE_5M_INDEX_TABLE;
444                 break;
445         default:
446                 break;
447         }
448
449         return next_rate;
450 }
451 /**
452  * rs_tx_status - Update rate control values based on Tx results
453  *
454  * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by
455  * the hardware for each rate.
456  */
457 static void rs_tx_status(void *priv_rate,
458                          struct net_device *dev,
459                          struct sk_buff *skb,
460                          struct ieee80211_tx_status *tx_resp)
461 {
462         u8 retries, current_count;
463         int scale_rate_index, first_index, last_index;
464         unsigned long flags;
465         struct sta_info *sta;
466         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
467         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
468         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
469         struct iwl_rate_scale_priv *rs_priv;
470
471         IWL_DEBUG_RATE("enter\n");
472
473         retries = tx_resp->retry_count;
474
475         first_index = tx_resp->control.tx_rate;
476         if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) {
477                 IWL_DEBUG_RATE("leave: Rate out of bounds: %0x for %d\n",
478                                tx_resp->control.tx_rate, first_index);
479                 return;
480         }
481
482         sta = sta_info_get(local, hdr->addr1);
483         if (!sta || !sta->rate_ctrl_priv) {
484                 if (sta)
485                         sta_info_put(sta);
486                 IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
487                 return;
488         }
489
490         rs_priv = (void *)sta->rate_ctrl_priv;
491
492         rs_priv->tx_packets++;
493
494         scale_rate_index = first_index;
495         last_index = first_index;
496
497         /*
498          * Update the window for each rate.  We determine which rates
499          * were Tx'd based on the total number of retries vs. the number
500          * of retries configured for each rate -- currently set to the
501          * priv value 'retry_rate' vs. rate specific
502          *
503          * On exit from this while loop last_index indicates the rate
504          * at which the frame was finally transmitted (or failed if no
505          * ACK)
506          */
507         while (retries > 0) {
508                 if (retries < priv->retry_rate) {
509                         current_count = retries;
510                         last_index = scale_rate_index;
511                 } else {
512                         current_count = priv->retry_rate;
513                         last_index = rs_adjust_next_rate(priv,
514                                                          scale_rate_index);
515                 }
516
517                 /* Update this rate accounting for as many retries
518                  * as was used for it (per current_count) */
519                 iwl_collect_tx_data(rs_priv,
520                                     &rs_priv->win[scale_rate_index],
521                                     0, current_count);
522                 IWL_DEBUG_RATE("Update rate %d for %d retries.\n",
523                                scale_rate_index, current_count);
524
525                 retries -= current_count;
526
527                 if (retries)
528                         scale_rate_index =
529                             rs_adjust_next_rate(priv, scale_rate_index);
530         }
531
532
533         /* Update the last index window with success/failure based on ACK */
534         IWL_DEBUG_RATE("Update rate %d with %s.\n",
535                        last_index,
536                        (tx_resp->flags & IEEE80211_TX_STATUS_ACK) ?
537                        "success" : "failure");
538         iwl_collect_tx_data(rs_priv,
539                             &rs_priv->win[last_index],
540                             tx_resp->flags & IEEE80211_TX_STATUS_ACK, 1);
541
542         /* We updated the rate scale window -- if its been more than
543          * flush_time since the last run, schedule the flush
544          * again */
545         spin_lock_irqsave(&rs_priv->lock, flags);
546
547         if (!rs_priv->flush_pending &&
548             time_after(jiffies, rs_priv->last_partial_flush +
549                        rs_priv->flush_time)) {
550
551                 rs_priv->flush_pending = 1;
552                 mod_timer(&rs_priv->rate_scale_flush,
553                           jiffies + rs_priv->flush_time);
554         }
555
556         spin_unlock_irqrestore(&rs_priv->lock, flags);
557
558         sta_info_put(sta);
559
560         IWL_DEBUG_RATE("leave\n");
561
562         return;
563 }
564
565 static struct ieee80211_rate *iwl_get_lowest_rate(struct ieee80211_local
566                                                   *local)
567 {
568         struct ieee80211_hw_mode *mode = local->oper_hw_mode;
569         int i;
570
571         for (i = 0; i < mode->num_rates; i++) {
572                 struct ieee80211_rate *rate = &mode->rates[i];
573
574                 if (rate->flags & IEEE80211_RATE_SUPPORTED)
575                         return rate;
576         }
577
578         return &mode->rates[0];
579 }
580
581 static u16 iwl_get_adjacent_rate(struct iwl_rate_scale_priv *rs_priv,
582                                  u8 index, u16 rate_mask, int phymode)
583 {
584         u8 high = IWL_RATE_INVALID;
585         u8 low = IWL_RATE_INVALID;
586
587         /* 802.11A walks to the next literal adjascent rate in
588          * the rate table */
589         if (unlikely(phymode == MODE_IEEE80211A)) {
590                 int i;
591                 u32 mask;
592
593                 /* Find the previous rate that is in the rate mask */
594                 i = index - 1;
595                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
596                         if (rate_mask & mask) {
597                                 low = i;
598                                 break;
599                         }
600                 }
601
602                 /* Find the next rate that is in the rate mask */
603                 i = index + 1;
604                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
605                         if (rate_mask & mask) {
606                                 high = i;
607                                 break;
608                         }
609                 }
610
611                 return (high << 8) | low;
612         }
613
614         low = index;
615         while (low != IWL_RATE_INVALID) {
616                 if (rs_priv->tgg)
617                         low = iwl_rates[low].prev_rs_tgg;
618                 else
619                         low = iwl_rates[low].prev_rs;
620                 if (low == IWL_RATE_INVALID)
621                         break;
622                 if (rate_mask & (1 << low))
623                         break;
624                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
625         }
626
627         high = index;
628         while (high != IWL_RATE_INVALID) {
629                 if (rs_priv->tgg)
630                         high = iwl_rates[high].next_rs_tgg;
631                 else
632                         high = iwl_rates[high].next_rs;
633                 if (high == IWL_RATE_INVALID)
634                         break;
635                 if (rate_mask & (1 << high))
636                         break;
637                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
638         }
639
640         return (high << 8) | low;
641 }
642
643 /**
644  * rs_get_rate - find the rate for the requested packet
645  *
646  * Returns the ieee80211_rate structure allocated by the driver.
647  *
648  * The rate control algorithm has no internal mapping between hw_mode's
649  * rate ordering and the rate ordering used by the rate control algorithm.
650  *
651  * The rate control algorithm uses a single table of rates that goes across
652  * the entire A/B/G spectrum vs. being limited to just one particular
653  * hw_mode.
654  *
655  * As such, we can't convert the index obtained below into the hw_mode's
656  * rate table and must reference the driver allocated rate table
657  *
658  */
659 static struct ieee80211_rate *rs_get_rate(void *priv_rate,
660                                           struct net_device *dev,
661                                           struct sk_buff *skb,
662                                           struct rate_control_extra *extra)
663 {
664         u8 low = IWL_RATE_INVALID;
665         u8 high = IWL_RATE_INVALID;
666         u16 high_low;
667         int index;
668         struct iwl_rate_scale_priv *rs_priv;
669         struct iwl_rate_scale_data *window = NULL;
670         int current_tpt = IWL_INVALID_VALUE;
671         int low_tpt = IWL_INVALID_VALUE;
672         int high_tpt = IWL_INVALID_VALUE;
673         u32 fail_count;
674         s8 scale_action = 0;
675         unsigned long flags;
676         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
677         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
678         struct sta_info *sta;
679         u16 fc, rate_mask;
680         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
681         DECLARE_MAC_BUF(mac);
682
683         IWL_DEBUG_RATE("enter\n");
684
685         memset(extra, 0, sizeof(*extra));
686
687         fc = le16_to_cpu(hdr->frame_control);
688         if (((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) ||
689             (is_multicast_ether_addr(hdr->addr1))) {
690                 /* Send management frames and broadcast/multicast data using
691                  * lowest rate. */
692                 /* TODO: this could probably be improved.. */
693                 IWL_DEBUG_RATE("leave: lowest rate (not data or is "
694                                "multicast)\n");
695
696                 return iwl_get_lowest_rate(local);
697         }
698
699         sta = sta_info_get(local, hdr->addr1);
700         if (!sta || !sta->rate_ctrl_priv) {
701                 IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
702                 if (sta)
703                         sta_info_put(sta);
704                 return NULL;
705         }
706
707         rate_mask = sta->supp_rates;
708         index = min(sta->last_txrate & 0xffff, IWL_RATE_COUNT - 1);
709
710         if (priv->phymode == (u8) MODE_IEEE80211A)
711                 rate_mask = rate_mask << IWL_FIRST_OFDM_RATE;
712
713         rs_priv = (void *)sta->rate_ctrl_priv;
714
715         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
716             !rs_priv->ibss_sta_added) {
717                 u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
718
719                 if (sta_id == IWL_INVALID_STATION) {
720                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
721                                        print_mac(mac, hdr->addr1));
722                         sta_id = iwl_add_station(priv,
723                                     hdr->addr1, 0, CMD_ASYNC);
724                 }
725                 if (sta_id != IWL_INVALID_STATION)
726                         rs_priv->ibss_sta_added = 1;
727         }
728
729         spin_lock_irqsave(&rs_priv->lock, flags);
730
731         if (rs_priv->start_rate != IWL_RATE_INVALID) {
732                 index = rs_priv->start_rate;
733                 rs_priv->start_rate = IWL_RATE_INVALID;
734         }
735
736         window = &(rs_priv->win[index]);
737
738         fail_count = window->counter - window->success_counter;
739
740         if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) &&
741              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
742                 window->average_tpt = IWL_INVALID_VALUE;
743                 spin_unlock_irqrestore(&rs_priv->lock, flags);
744
745                 IWL_DEBUG_RATE("Invalid average_tpt on rate %d: "
746                                "counter: %d, success_counter: %d, "
747                                "expected_tpt is %sNULL\n",
748                                index,
749                                window->counter,
750                                window->success_counter,
751                                rs_priv->expected_tpt ? "not " : "");
752                 goto out;
753
754         }
755
756         window->average_tpt = ((window->success_ratio *
757                                 rs_priv->expected_tpt[index] + 64) / 128);
758         current_tpt = window->average_tpt;
759
760         high_low = iwl_get_adjacent_rate(rs_priv, index, rate_mask,
761                                          local->hw.conf.phymode);
762         low = high_low & 0xff;
763         high = (high_low >> 8) & 0xff;
764
765         if (low != IWL_RATE_INVALID)
766                 low_tpt = rs_priv->win[low].average_tpt;
767
768         if (high != IWL_RATE_INVALID)
769                 high_tpt = rs_priv->win[high].average_tpt;
770
771         spin_unlock_irqrestore(&rs_priv->lock, flags);
772
773         scale_action = 1;
774
775         if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
776                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
777                 scale_action = -1;
778         } else if ((low_tpt == IWL_INVALID_VALUE) &&
779                    (high_tpt == IWL_INVALID_VALUE))
780                 scale_action = 1;
781         else if ((low_tpt != IWL_INVALID_VALUE) &&
782                    (high_tpt != IWL_INVALID_VALUE)
783                    && (low_tpt < current_tpt)
784                    && (high_tpt < current_tpt)) {
785                 IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < "
786                                "current_tpt [%d]\n",
787                                low_tpt, high_tpt, current_tpt);
788                 scale_action = 0;
789         } else {
790                 if (high_tpt != IWL_INVALID_VALUE) {
791                         if (high_tpt > current_tpt)
792                                 scale_action = 1;
793                         else {
794                                 IWL_DEBUG_RATE
795                                     ("decrease rate because of high tpt\n");
796                                 scale_action = -1;
797                         }
798                 } else if (low_tpt != IWL_INVALID_VALUE) {
799                         if (low_tpt > current_tpt) {
800                                 IWL_DEBUG_RATE
801                                     ("decrease rate because of low tpt\n");
802                                 scale_action = -1;
803                         } else
804                                 scale_action = 1;
805                 }
806         }
807
808         if ((window->success_ratio > IWL_RATE_HIGH_TH) ||
809             (current_tpt > window->average_tpt)) {
810                 IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or "
811                                "current_tpt [%d] > average_tpt [%d]\n",
812                                window->success_ratio,
813                                current_tpt, window->average_tpt);
814                 scale_action = 0;
815         }
816
817         switch (scale_action) {
818         case -1:
819                 if (low != IWL_RATE_INVALID)
820                         index = low;
821                 break;
822
823         case 1:
824                 if (high != IWL_RATE_INVALID)
825                         index = high;
826
827                 break;
828
829         case 0:
830         default:
831                 break;
832         }
833
834         IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n",
835                        index, scale_action, low, high);
836
837  out:
838
839         sta->last_txrate = index;
840         if (priv->phymode == (u8) MODE_IEEE80211A)
841                 sta->txrate = sta->last_txrate - IWL_FIRST_OFDM_RATE;
842         else
843                 sta->txrate = sta->last_txrate;
844
845         sta_info_put(sta);
846
847         IWL_DEBUG_RATE("leave: %d\n", index);
848
849         return &priv->ieee_rates[index];
850 }
851
852 static struct rate_control_ops rs_ops = {
853         .module = NULL,
854         .name = RS_NAME,
855         .tx_status = rs_tx_status,
856         .get_rate = rs_get_rate,
857         .rate_init = rs_rate_init,
858         .clear = rs_clear,
859         .alloc = rs_alloc,
860         .free = rs_free,
861         .alloc_sta = rs_alloc_sta,
862         .free_sta = rs_free_sta,
863 };
864
865 int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
866 {
867         struct ieee80211_local *local = hw_to_local(hw);
868         struct iwl_priv *priv = hw->priv;
869         struct iwl_rate_scale_priv *rs_priv;
870         struct sta_info *sta;
871         unsigned long flags;
872         int count = 0, i;
873         u32 samples = 0, success = 0, good = 0;
874         unsigned long now = jiffies;
875         u32 max_time = 0;
876
877         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
878         if (!sta || !sta->rate_ctrl_priv) {
879                 if (sta) {
880                         sta_info_put(sta);
881                         IWL_DEBUG_RATE("leave - no private rate data!\n");
882                 } else
883                         IWL_DEBUG_RATE("leave - no station!\n");
884                 return sprintf(buf, "station %d not found\n", sta_id);
885         }
886
887         rs_priv = (void *)sta->rate_ctrl_priv;
888         spin_lock_irqsave(&rs_priv->lock, flags);
889         i = IWL_RATE_54M_INDEX;
890         while (1) {
891                 u64 mask;
892                 int j;
893
894                 count +=
895                     sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
896
897                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
898                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
899                         buf[count++] =
900                             (rs_priv->win[i].data & mask) ? '1' : '0';
901
902                 samples += rs_priv->win[i].counter;
903                 good += rs_priv->win[i].success_counter;
904                 success += rs_priv->win[i].success_counter * iwl_rates[i].ieee;
905
906                 if (rs_priv->win[i].stamp) {
907                         int delta =
908                             jiffies_to_msecs(now - rs_priv->win[i].stamp);
909
910                         if (delta > max_time)
911                                 max_time = delta;
912
913                         count += sprintf(&buf[count], "%5dms\n", delta);
914                 } else
915                         buf[count++] = '\n';
916
917                 j = iwl_get_prev_ieee_rate(i);
918                 if (j == i)
919                         break;
920                 i = j;
921         }
922         spin_unlock_irqrestore(&rs_priv->lock, flags);
923         sta_info_put(sta);
924
925         /* Display the average rate of all samples taken.
926          *
927          * NOTE:  We multiple # of samples by 2 since the IEEE measurement
928          * added from iwl_rates is actually 2X the rate */
929         if (samples)
930                 count += sprintf(
931                         &buf[count],
932                         "\nAverage rate is %3d.%02dMbs over last %4dms\n"
933                         "%3d%% success (%d good packets over %d tries)\n",
934                         success / (2 * samples), (success * 5 / samples) % 10,
935                         max_time, good * 100 / samples, good, samples);
936         else
937                 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
938
939         return count;
940 }
941
942 void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
943 {
944         struct iwl_priv *priv = hw->priv;
945         s32 rssi = 0;
946         unsigned long flags;
947         struct ieee80211_local *local = hw_to_local(hw);
948         struct iwl_rate_scale_priv *rs_priv;
949         struct sta_info *sta;
950
951         IWL_DEBUG_RATE("enter\n");
952
953         if (!local->rate_ctrl->ops->name ||
954             strcmp(local->rate_ctrl->ops->name, RS_NAME)) {
955                 IWL_WARNING("iwl-3945-rs not selected as rate control algo!\n");
956                 IWL_DEBUG_RATE("leave - mac80211 picked the wrong RC algo.\n");
957                 return;
958         }
959
960         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
961         if (!sta || !sta->rate_ctrl_priv) {
962                 if (sta)
963                         sta_info_put(sta);
964                 IWL_DEBUG_RATE("leave - no private rate data!\n");
965                 return;
966         }
967
968         rs_priv = (void *)sta->rate_ctrl_priv;
969
970         spin_lock_irqsave(&rs_priv->lock, flags);
971
972         rs_priv->tgg = 0;
973         switch (priv->phymode) {
974         case MODE_IEEE80211G:
975                 if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
976                         rs_priv->tgg = 1;
977                         rs_priv->expected_tpt = iwl_expected_tpt_g_prot;
978                 } else
979                         rs_priv->expected_tpt = iwl_expected_tpt_g;
980                 break;
981
982         case MODE_IEEE80211A:
983                 rs_priv->expected_tpt = iwl_expected_tpt_a;
984                 break;
985
986         default:
987                 IWL_WARNING("Invalid phymode.  Defaulting to 802.11b\n");
988         case MODE_IEEE80211B:
989                 rs_priv->expected_tpt = iwl_expected_tpt_b;
990                 break;
991         }
992
993         sta_info_put(sta);
994         spin_unlock_irqrestore(&rs_priv->lock, flags);
995
996         rssi = priv->last_rx_rssi;
997         if (rssi == 0)
998                 rssi = IWL_MIN_RSSI_VAL;
999
1000         IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi);
1001
1002         rs_priv->start_rate = iwl_get_rate_index_by_rssi(rssi, priv->phymode);
1003
1004         IWL_DEBUG_RATE("leave: rssi %d assign rate index: "
1005                        "%d (plcp 0x%x)\n", rssi, rs_priv->start_rate,
1006                        iwl_rates[rs_priv->start_rate].plcp);
1007 }
1008
1009 void iwl_rate_control_register(struct ieee80211_hw *hw)
1010 {
1011         ieee80211_rate_control_register(&rs_ops);
1012 }
1013
1014 void iwl_rate_control_unregister(struct ieee80211_hw *hw)
1015 {
1016         ieee80211_rate_control_unregister(&rs_ops);
1017 }
1018
1019