Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus
[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         0, 0, 76, 104, 130, 168, 191, 202, 7, 13, 35, 58
75 };
76
77 static s32 iwl_expected_tpt_g_prot[IWL_RATE_COUNT] = {
78         0, 0, 0, 80, 93, 113, 123, 125, 7, 13, 35, 58
79 };
80
81 static s32 iwl_expected_tpt_a[IWL_RATE_COUNT] = {
82         40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0, 0
83 };
84
85 static s32 iwl_expected_tpt_b[IWL_RATE_COUNT] = {
86         0, 0, 0, 0, 0, 0, 0, 0, 7, 13, 35, 58
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         IWL_DEBUG_RATE("leave\n");
354 }
355
356 static void *rs_alloc(struct ieee80211_local *local)
357 {
358         return local->hw.priv;
359 }
360
361 /* rate scale requires free function to be implmented */
362 static void rs_free(void *priv)
363 {
364         return;
365 }
366 static void rs_clear(void *priv)
367 {
368         return;
369 }
370
371
372 static void *rs_alloc_sta(void *priv, gfp_t gfp)
373 {
374         struct iwl_rate_scale_priv *rs_priv;
375         int i;
376
377         IWL_DEBUG_RATE("enter\n");
378
379         rs_priv = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
380         if (!rs_priv) {
381                 IWL_DEBUG_RATE("leave: ENOMEM\n");
382                 return NULL;
383         }
384
385         spin_lock_init(&rs_priv->lock);
386
387         rs_priv->start_rate = IWL_RATE_INVALID;
388
389         /* default to just 802.11b */
390         rs_priv->expected_tpt = iwl_expected_tpt_b;
391
392         rs_priv->last_partial_flush = jiffies;
393         rs_priv->last_flush = jiffies;
394         rs_priv->flush_time = IWL_RATE_FLUSH;
395         rs_priv->last_tx_packets = 0;
396         rs_priv->ibss_sta_added = 0;
397
398         init_timer(&rs_priv->rate_scale_flush);
399         rs_priv->rate_scale_flush.data = (unsigned long)rs_priv;
400         rs_priv->rate_scale_flush.function = &iwl_bg_rate_scale_flush;
401
402         for (i = 0; i < IWL_RATE_COUNT; i++)
403                 iwl_clear_window(&rs_priv->win[i]);
404
405         IWL_DEBUG_RATE("leave\n");
406
407         return rs_priv;
408 }
409
410 static void rs_free_sta(void *priv, void *priv_sta)
411 {
412         struct iwl_rate_scale_priv *rs_priv = priv_sta;
413
414         IWL_DEBUG_RATE("enter\n");
415         del_timer_sync(&rs_priv->rate_scale_flush);
416         kfree(rs_priv);
417         IWL_DEBUG_RATE("leave\n");
418 }
419
420 /**
421  * rs_tx_status - Update rate control values based on Tx results
422  *
423  * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by
424  * the hardware for each rate.
425  */
426 static void rs_tx_status(void *priv_rate,
427                          struct net_device *dev,
428                          struct sk_buff *skb,
429                          struct ieee80211_tx_status *tx_resp)
430 {
431         u8 retries, current_count;
432         int scale_rate_index, first_index, last_index;
433         unsigned long flags;
434         struct sta_info *sta;
435         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
436         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
437         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
438         struct iwl_rate_scale_priv *rs_priv;
439
440         IWL_DEBUG_RATE("enter\n");
441
442         retries = tx_resp->retry_count;
443
444         first_index = tx_resp->control.tx_rate;
445         if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) {
446                 IWL_DEBUG_RATE("leave: Rate out of bounds: %0x for %d\n",
447                                tx_resp->control.tx_rate, first_index);
448                 return;
449         }
450
451         sta = sta_info_get(local, hdr->addr1);
452         if (!sta || !sta->rate_ctrl_priv) {
453                 if (sta)
454                         sta_info_put(sta);
455                 IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
456                 return;
457         }
458
459         rs_priv = (void *)sta->rate_ctrl_priv;
460
461         rs_priv->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 > 0) {
477                 if (retries < priv->retry_rate) {
478                         current_count = retries;
479                         last_index = scale_rate_index;
480                 } else {
481                         current_count = priv->retry_rate;
482                         last_index = iwl_get_prev_ieee_rate(scale_rate_index);
483                 }
484
485                 /* Update this rate accounting for as many retries
486                  * as was used for it (per current_count) */
487                 iwl_collect_tx_data(rs_priv,
488                                     &rs_priv->win[scale_rate_index],
489                                     0, current_count);
490                 IWL_DEBUG_RATE("Update rate %d for %d retries.\n",
491                                scale_rate_index, current_count);
492
493                 retries -= current_count;
494
495                 if (retries)
496                         scale_rate_index =
497                             iwl_get_prev_ieee_rate(scale_rate_index);
498         }
499
500         /* Update the last index window with success/failure based on ACK */
501         IWL_DEBUG_RATE("Update rate %d with %s.\n",
502                        last_index,
503                        (tx_resp->flags & IEEE80211_TX_STATUS_ACK) ?
504                        "success" : "failure");
505         iwl_collect_tx_data(rs_priv,
506                             &rs_priv->win[last_index],
507                             tx_resp->flags & IEEE80211_TX_STATUS_ACK, 1);
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_priv->lock, flags);
513
514         if (!rs_priv->flush_pending &&
515             time_after(jiffies, rs_priv->last_partial_flush +
516                        rs_priv->flush_time)) {
517
518                 rs_priv->flush_pending = 1;
519                 mod_timer(&rs_priv->rate_scale_flush,
520                           jiffies + rs_priv->flush_time);
521         }
522
523         spin_unlock_irqrestore(&rs_priv->lock, flags);
524
525         sta_info_put(sta);
526
527         IWL_DEBUG_RATE("leave\n");
528
529         return;
530 }
531
532 static struct ieee80211_rate *iwl_get_lowest_rate(struct ieee80211_local
533                                                   *local)
534 {
535         struct ieee80211_hw_mode *mode = local->oper_hw_mode;
536         int i;
537
538         for (i = 0; i < mode->num_rates; i++) {
539                 struct ieee80211_rate *rate = &mode->rates[i];
540
541                 if (rate->flags & IEEE80211_RATE_SUPPORTED)
542                         return rate;
543         }
544
545         return &mode->rates[0];
546 }
547
548 static u16 iwl_get_adjacent_rate(struct iwl_rate_scale_priv *rs_priv,
549                                  u8 index, u16 rate_mask, int phymode)
550 {
551         u8 high = IWL_RATE_INVALID;
552         u8 low = IWL_RATE_INVALID;
553
554         /* 802.11A walks to the next literal adjascent rate in
555          * the rate table */
556         if (unlikely(phymode == MODE_IEEE80211A)) {
557                 int i;
558                 u32 mask;
559
560                 /* Find the previous rate that is in the rate mask */
561                 i = index - 1;
562                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
563                         if (rate_mask & mask) {
564                                 low = i;
565                                 break;
566                         }
567                 }
568
569                 /* Find the next rate that is in the rate mask */
570                 i = index + 1;
571                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
572                         if (rate_mask & mask) {
573                                 high = i;
574                                 break;
575                         }
576                 }
577
578                 return (high << 8) | low;
579         }
580
581         low = index;
582         while (low != IWL_RATE_INVALID) {
583                 if (rs_priv->tgg)
584                         low = iwl_rates[low].prev_rs_tgg;
585                 else
586                         low = iwl_rates[low].prev_rs;
587                 if (low == IWL_RATE_INVALID)
588                         break;
589                 if (rate_mask & (1 << low))
590                         break;
591                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
592         }
593
594         high = index;
595         while (high != IWL_RATE_INVALID) {
596                 if (rs_priv->tgg)
597                         high = iwl_rates[high].next_rs_tgg;
598                 else
599                         high = iwl_rates[high].next_rs;
600                 if (high == IWL_RATE_INVALID)
601                         break;
602                 if (rate_mask & (1 << high))
603                         break;
604                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
605         }
606
607         return (high << 8) | low;
608 }
609
610 /**
611  * rs_get_rate - find the rate for the requested packet
612  *
613  * Returns the ieee80211_rate structure allocated by the driver.
614  *
615  * The rate control algorithm has no internal mapping between hw_mode's
616  * rate ordering and the rate ordering used by the rate control algorithm.
617  *
618  * The rate control algorithm uses a single table of rates that goes across
619  * the entire A/B/G spectrum vs. being limited to just one particular
620  * hw_mode.
621  *
622  * As such, we can't convert the index obtained below into the hw_mode's
623  * rate table and must reference the driver allocated rate table
624  *
625  */
626 static struct ieee80211_rate *rs_get_rate(void *priv_rate,
627                                           struct net_device *dev,
628                                           struct sk_buff *skb,
629                                           struct rate_control_extra *extra)
630 {
631         u8 low = IWL_RATE_INVALID;
632         u8 high = IWL_RATE_INVALID;
633         u16 high_low;
634         int index;
635         struct iwl_rate_scale_priv *rs_priv;
636         struct iwl_rate_scale_data *window = NULL;
637         int current_tpt = IWL_INVALID_VALUE;
638         int low_tpt = IWL_INVALID_VALUE;
639         int high_tpt = IWL_INVALID_VALUE;
640         u32 fail_count;
641         s8 scale_action = 0;
642         unsigned long flags;
643         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
644         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
645         struct sta_info *sta;
646         u16 fc, rate_mask;
647         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
648         DECLARE_MAC_BUF(mac);
649
650         IWL_DEBUG_RATE("enter\n");
651
652         memset(extra, 0, sizeof(*extra));
653
654         fc = le16_to_cpu(hdr->frame_control);
655         if (((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) ||
656             (is_multicast_ether_addr(hdr->addr1))) {
657                 /* Send management frames and broadcast/multicast data using
658                  * lowest rate. */
659                 /* TODO: this could probably be improved.. */
660                 IWL_DEBUG_RATE("leave: lowest rate (not data or is "
661                                "multicast)\n");
662
663                 return iwl_get_lowest_rate(local);
664         }
665
666         sta = sta_info_get(local, hdr->addr1);
667         if (!sta || !sta->rate_ctrl_priv) {
668                 IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
669                 if (sta)
670                         sta_info_put(sta);
671                 return NULL;
672         }
673
674         rate_mask = sta->supp_rates;
675         index = min(sta->txrate & 0xffff, IWL_RATE_COUNT - 1);
676
677         rs_priv = (void *)sta->rate_ctrl_priv;
678
679         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
680             !rs_priv->ibss_sta_added) {
681                 u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
682
683                 if (sta_id == IWL_INVALID_STATION) {
684                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
685                                        print_mac(mac, hdr->addr1));
686                         sta_id = iwl_add_station(priv,
687                                     hdr->addr1, 0, CMD_ASYNC);
688                 }
689                 if (sta_id != IWL_INVALID_STATION)
690                         rs_priv->ibss_sta_added = 1;
691         }
692
693         spin_lock_irqsave(&rs_priv->lock, flags);
694
695         if (rs_priv->start_rate != IWL_RATE_INVALID) {
696                 index = rs_priv->start_rate;
697                 rs_priv->start_rate = IWL_RATE_INVALID;
698         }
699
700         window = &(rs_priv->win[index]);
701
702         fail_count = window->counter - window->success_counter;
703
704         if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) &&
705              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
706                 window->average_tpt = IWL_INVALID_VALUE;
707                 spin_unlock_irqrestore(&rs_priv->lock, flags);
708
709                 IWL_DEBUG_RATE("Invalid average_tpt on rate %d: "
710                                "counter: %d, success_counter: %d, "
711                                "expected_tpt is %sNULL\n",
712                                index,
713                                window->counter,
714                                window->success_counter,
715                                rs_priv->expected_tpt ? "not " : "");
716                 goto out;
717
718         }
719
720         window->average_tpt = ((window->success_ratio *
721                                 rs_priv->expected_tpt[index] + 64) / 128);
722         current_tpt = window->average_tpt;
723
724         high_low = iwl_get_adjacent_rate(rs_priv, index, rate_mask,
725                                          local->hw.conf.phymode);
726         low = high_low & 0xff;
727         high = (high_low >> 8) & 0xff;
728
729         if (low != IWL_RATE_INVALID)
730                 low_tpt = rs_priv->win[low].average_tpt;
731
732         if (high != IWL_RATE_INVALID)
733                 high_tpt = rs_priv->win[high].average_tpt;
734
735         spin_unlock_irqrestore(&rs_priv->lock, flags);
736
737         scale_action = 1;
738
739         if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
740                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
741                 scale_action = -1;
742         } else if ((low_tpt == IWL_INVALID_VALUE) &&
743                    (high_tpt == IWL_INVALID_VALUE))
744                 scale_action = 1;
745         else if ((low_tpt != IWL_INVALID_VALUE) &&
746                    (high_tpt != IWL_INVALID_VALUE)
747                    && (low_tpt < current_tpt)
748                    && (high_tpt < current_tpt)) {
749                 IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < "
750                                "current_tpt [%d]\n",
751                                low_tpt, high_tpt, current_tpt);
752                 scale_action = 0;
753         } else {
754                 if (high_tpt != IWL_INVALID_VALUE) {
755                         if (high_tpt > current_tpt)
756                                 scale_action = 1;
757                         else {
758                                 IWL_DEBUG_RATE
759                                     ("decrease rate because of high tpt\n");
760                                 scale_action = -1;
761                         }
762                 } else if (low_tpt != IWL_INVALID_VALUE) {
763                         if (low_tpt > current_tpt) {
764                                 IWL_DEBUG_RATE
765                                     ("decrease rate because of low tpt\n");
766                                 scale_action = -1;
767                         } else
768                                 scale_action = 1;
769                 }
770         }
771
772         if ((window->success_ratio > IWL_RATE_HIGH_TH) ||
773             (current_tpt > window->average_tpt)) {
774                 IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or "
775                                "current_tpt [%d] > average_tpt [%d]\n",
776                                window->success_ratio,
777                                current_tpt, window->average_tpt);
778                 scale_action = 0;
779         }
780
781         switch (scale_action) {
782         case -1:
783                 if (low != IWL_RATE_INVALID)
784                         index = low;
785                 break;
786
787         case 1:
788                 if (high != IWL_RATE_INVALID)
789                         index = high;
790
791                 break;
792
793         case 0:
794         default:
795                 break;
796         }
797
798         IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n",
799                        index, scale_action, low, high);
800
801  out:
802
803         sta->last_txrate = index;
804         sta->txrate = sta->last_txrate;
805         sta_info_put(sta);
806
807         IWL_DEBUG_RATE("leave: %d\n", index);
808
809         return &priv->ieee_rates[index];
810 }
811
812 static struct rate_control_ops rs_ops = {
813         .module = NULL,
814         .name = RS_NAME,
815         .tx_status = rs_tx_status,
816         .get_rate = rs_get_rate,
817         .rate_init = rs_rate_init,
818         .clear = rs_clear,
819         .alloc = rs_alloc,
820         .free = rs_free,
821         .alloc_sta = rs_alloc_sta,
822         .free_sta = rs_free_sta,
823 };
824
825 int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
826 {
827         struct ieee80211_local *local = hw_to_local(hw);
828         struct iwl_priv *priv = hw->priv;
829         struct iwl_rate_scale_priv *rs_priv;
830         struct sta_info *sta;
831         unsigned long flags;
832         int count = 0, i;
833         u32 samples = 0, success = 0, good = 0;
834         unsigned long now = jiffies;
835         u32 max_time = 0;
836
837         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
838         if (!sta || !sta->rate_ctrl_priv) {
839                 if (sta) {
840                         sta_info_put(sta);
841                         IWL_DEBUG_RATE("leave - no private rate data!\n");
842                 } else
843                         IWL_DEBUG_RATE("leave - no station!\n");
844                 return sprintf(buf, "station %d not found\n", sta_id);
845         }
846
847         rs_priv = (void *)sta->rate_ctrl_priv;
848         spin_lock_irqsave(&rs_priv->lock, flags);
849         i = IWL_RATE_54M_INDEX;
850         while (1) {
851                 u64 mask;
852                 int j;
853
854                 count +=
855                     sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
856
857                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
858                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
859                         buf[count++] =
860                             (rs_priv->win[i].data & mask) ? '1' : '0';
861
862                 samples += rs_priv->win[i].counter;
863                 good += rs_priv->win[i].success_counter;
864                 success += rs_priv->win[i].success_counter * iwl_rates[i].ieee;
865
866                 if (rs_priv->win[i].stamp) {
867                         int delta =
868                             jiffies_to_msecs(now - rs_priv->win[i].stamp);
869
870                         if (delta > max_time)
871                                 max_time = delta;
872
873                         count += sprintf(&buf[count], "%5dms\n", delta);
874                 } else
875                         buf[count++] = '\n';
876
877                 j = iwl_get_prev_ieee_rate(i);
878                 if (j == i)
879                         break;
880                 i = j;
881         }
882         spin_unlock_irqrestore(&rs_priv->lock, flags);
883         sta_info_put(sta);
884
885         /* Display the average rate of all samples taken.
886          *
887          * NOTE:  We multiple # of samples by 2 since the IEEE measurement
888          * added from iwl_rates is actually 2X the rate */
889         if (samples)
890                 count += sprintf(
891                         &buf[count],
892                         "\nAverage rate is %3d.%02dMbs over last %4dms\n"
893                         "%3d%% success (%d good packets over %d tries)\n",
894                         success / (2 * samples), (success * 5 / samples) % 10,
895                         max_time, good * 100 / samples, good, samples);
896         else
897                 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
898
899         return count;
900 }
901
902 void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
903 {
904         struct iwl_priv *priv = hw->priv;
905         s32 rssi = 0;
906         unsigned long flags;
907         struct ieee80211_local *local = hw_to_local(hw);
908         struct iwl_rate_scale_priv *rs_priv;
909         struct sta_info *sta;
910
911         IWL_DEBUG_RATE("enter\n");
912
913         if (!local->rate_ctrl->ops->name ||
914             strcmp(local->rate_ctrl->ops->name, RS_NAME)) {
915                 IWL_WARNING("iwl-3945-rs not selected as rate control algo!\n");
916                 IWL_DEBUG_RATE("leave - mac80211 picked the wrong RC algo.\n");
917                 return;
918         }
919
920         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
921         if (!sta || !sta->rate_ctrl_priv) {
922                 if (sta)
923                         sta_info_put(sta);
924                 IWL_DEBUG_RATE("leave - no private rate data!\n");
925                 return;
926         }
927
928         rs_priv = (void *)sta->rate_ctrl_priv;
929
930         spin_lock_irqsave(&rs_priv->lock, flags);
931
932         rs_priv->tgg = 0;
933         switch (priv->phymode) {
934         case MODE_IEEE80211G:
935                 if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
936                         rs_priv->tgg = 1;
937                         rs_priv->expected_tpt = iwl_expected_tpt_g_prot;
938                 } else
939                         rs_priv->expected_tpt = iwl_expected_tpt_g;
940                 break;
941
942         case MODE_IEEE80211A:
943                 rs_priv->expected_tpt = iwl_expected_tpt_a;
944                 break;
945
946         default:
947                 IWL_WARNING("Invalid phymode.  Defaulting to 802.11b\n");
948         case MODE_IEEE80211B:
949                 rs_priv->expected_tpt = iwl_expected_tpt_b;
950                 break;
951         }
952
953         sta_info_put(sta);
954         spin_unlock_irqrestore(&rs_priv->lock, flags);
955
956         rssi = priv->last_rx_rssi;
957         if (rssi == 0)
958                 rssi = IWL_MIN_RSSI_VAL;
959
960         IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi);
961
962         rs_priv->start_rate = iwl_get_rate_index_by_rssi(rssi, priv->phymode);
963
964         IWL_DEBUG_RATE("leave: rssi %d assign rate index: "
965                        "%d (plcp 0x%x)\n", rssi, rs_priv->start_rate,
966                        iwl_rates[rs_priv->start_rate].plcp);
967 }
968
969 void iwl_rate_control_register(struct ieee80211_hw *hw)
970 {
971         ieee80211_rate_control_register(&rs_ops);
972 }
973
974 void iwl_rate_control_unregister(struct ieee80211_hw *hw)
975 {
976         ieee80211_rate_control_unregister(&rs_ops);
977 }
978
979