isdn/capi: Return proper errnos on module init.
[linux-2.6.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2005 - 2008 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 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
31 #include <net/ieee80211.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 "../net/mac80211/rate.h"
40
41 #include "iwl-4965.h"
42 #include "iwl-core.h"
43 #include "iwl-helpers.h"
44
45 #define RS_NAME "iwl-4965-rs"
46
47 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
48 #define IWL_NUMBER_TRY      1
49 #define IWL_HT_NUMBER_TRY   3
50
51 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
52 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
53 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
54
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
57
58 static u8 rs_ht_to_legacy[] = {
59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61         IWL_RATE_6M_INDEX,
62         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66 };
67
68 struct iwl4965_rate {
69         u32 rate_n_flags;
70 } __attribute__ ((packed));
71
72 /**
73  * struct iwl4965_rate_scale_data -- tx success history for one rate
74  */
75 struct iwl4965_rate_scale_data {
76         u64 data;               /* bitmap of successful frames */
77         s32 success_counter;    /* number of frames successful */
78         s32 success_ratio;      /* per-cent * 128  */
79         s32 counter;            /* number of frames attempted */
80         s32 average_tpt;        /* success ratio * expected throughput */
81         unsigned long stamp;
82 };
83
84 /**
85  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
86  *
87  * There are two of these in struct iwl4965_lq_sta,
88  * one for "active", and one for "search".
89  */
90 struct iwl4965_scale_tbl_info {
91         enum iwl4965_table_type lq_type;
92         enum iwl4965_antenna_type antenna_type;
93         u8 is_SGI;      /* 1 = short guard interval */
94         u8 is_fat;      /* 1 = 40 MHz channel width */
95         u8 is_dup;      /* 1 = duplicated data streams */
96         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
97         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
98         struct iwl4965_rate current_rate;  /* rate_n_flags, uCode API format */
99         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
100 };
101
102 #ifdef CONFIG_IWL4965_HT
103
104 struct iwl4965_traffic_load {
105         unsigned long time_stamp;       /* age of the oldest statistics */
106         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
107                                                  * slice */
108         u32 total;                      /* total num of packets during the
109                                          * last TID_MAX_TIME_DIFF */
110         u8 queue_count;                 /* number of queues that has
111                                          * been used since the last cleanup */
112         u8 head;                        /* start of the circular buffer */
113 };
114
115 #endif /* CONFIG_IWL4965_HT */
116
117 /**
118  * struct iwl4965_lq_sta -- driver's rate scaling private structure
119  *
120  * Pointer to this gets passed back and forth between driver and mac80211.
121  */
122 struct iwl4965_lq_sta {
123         u8 active_tbl;          /* index of active table, range 0-1 */
124         u8 enable_counter;      /* indicates HT mode */
125         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
126         u8 search_better_tbl;   /* 1: currently trying alternate mode */
127         s32 last_tpt;
128
129         /* The following determine when to search for a new mode */
130         u32 table_count_limit;
131         u32 max_failure_limit;  /* # failed frames before new search */
132         u32 max_success_limit;  /* # successful frames before new search */
133         u32 table_count;
134         u32 total_failed;       /* total failed frames, any/all rates */
135         u32 total_success;      /* total successful frames, any/all rates */
136         u32 flush_timer;        /* time staying in mode before new search */
137
138         u8 action_counter;      /* # mode-switch actions tried */
139         u8 antenna;
140         u8 valid_antenna;
141         u8 is_green;
142         u8 is_dup;
143         enum ieee80211_band band;
144         u8 ibss_sta_added;
145
146         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
147         u32 supp_rates;
148         u16 active_rate;
149         u16 active_siso_rate;
150         u16 active_mimo_rate;
151         u16 active_rate_basic;
152
153         struct iwl_link_quality_cmd lq;
154         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
155 #ifdef CONFIG_IWL4965_HT
156         struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
157         u8 tx_agg_tid_en;
158 #endif
159 #ifdef CONFIG_MAC80211_DEBUGFS
160         struct dentry *rs_sta_dbgfs_scale_table_file;
161         struct dentry *rs_sta_dbgfs_stats_table_file;
162 #ifdef CONFIG_IWL4965_HT
163         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
164 #endif
165         struct iwl4965_rate dbg_fixed;
166 #endif
167         struct iwl_priv *drv;
168 };
169
170 static void rs_rate_scale_perform(struct iwl_priv *priv,
171                                    struct net_device *dev,
172                                    struct ieee80211_hdr *hdr,
173                                    struct sta_info *sta);
174 static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
175                              struct iwl4965_rate *tx_mcs,
176                              struct iwl_link_quality_cmd *tbl);
177
178
179 #ifdef CONFIG_MAC80211_DEBUGFS
180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
181                                 struct iwl4965_rate *mcs, int index);
182 #else
183 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
184                                 struct iwl4965_rate *mcs, int index)
185 {}
186 #endif
187
188 /*
189  * Expected throughput metrics for following rates:
190  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
191  * "G" is the only table that supports CCK (the first 4 rates).
192  */
193 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
194         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
195 };
196
197 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
198         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
199 };
200
201 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
202         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
203 };
204
205 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
206         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
207 };
208
209 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
210         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
211 };
212
213 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
214         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
215 };
216
217 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
218         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
219 };
220
221 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
222         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
223 };
224
225 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
226         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
227 };
228
229 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
230         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
231 };
232
233 static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
234 {
235         return (u8)(rate_n_flags & 0xFF);
236 }
237
238 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
239 {
240         window->data = 0;
241         window->success_counter = 0;
242         window->success_ratio = IWL_INVALID_VALUE;
243         window->counter = 0;
244         window->average_tpt = IWL_INVALID_VALUE;
245         window->stamp = 0;
246 }
247
248 #ifdef CONFIG_IWL4965_HT
249 /*
250  *      removes the old data from the statistics. All data that is older than
251  *      TID_MAX_TIME_DIFF, will be deleted.
252  */
253 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
254 {
255         /* The oldest age we want to keep */
256         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
257
258         while (tl->queue_count &&
259                (tl->time_stamp < oldest_time)) {
260                 tl->total -= tl->packet_count[tl->head];
261                 tl->packet_count[tl->head] = 0;
262                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
263                 tl->queue_count--;
264                 tl->head++;
265                 if (tl->head >= TID_QUEUE_MAX_SIZE)
266                         tl->head = 0;
267         }
268 }
269
270 /*
271  *      increment traffic load value for tid and also remove
272  *      any old values if passed the certain time period
273  */
274 static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
275 {
276         u32 curr_time = jiffies_to_msecs(jiffies);
277         u32 time_diff;
278         s32 index;
279         struct iwl4965_traffic_load *tl = NULL;
280
281         if (tid >= TID_MAX_LOAD_COUNT)
282                 return;
283
284         tl = &lq_data->load[tid];
285
286         curr_time -= curr_time % TID_ROUND_VALUE;
287
288         /* Happens only for the first packet. Initialize the data */
289         if (!(tl->queue_count)) {
290                 tl->total = 1;
291                 tl->time_stamp = curr_time;
292                 tl->queue_count = 1;
293                 tl->head = 0;
294                 tl->packet_count[0] = 1;
295                 return;
296         }
297
298         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
299         index = time_diff / TID_QUEUE_CELL_SPACING;
300
301         /* The history is too long: remove data that is older than */
302         /* TID_MAX_TIME_DIFF */
303         if (index >= TID_QUEUE_MAX_SIZE)
304                 rs_tl_rm_old_stats(tl, curr_time);
305
306         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
307         tl->packet_count[index] = tl->packet_count[index] + 1;
308         tl->total = tl->total + 1;
309
310         if ((index + 1) > tl->queue_count)
311                 tl->queue_count = index + 1;
312 }
313
314 /*
315         get the traffic load value for tid
316 */
317 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
318 {
319         u32 curr_time = jiffies_to_msecs(jiffies);
320         u32 time_diff;
321         s32 index;
322         struct iwl4965_traffic_load *tl = NULL;
323
324         if (tid >= TID_MAX_LOAD_COUNT)
325                 return 0;
326
327         tl = &(lq_data->load[tid]);
328
329         curr_time -= curr_time % TID_ROUND_VALUE;
330
331         if (!(tl->queue_count))
332                 return 0;
333
334         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
335         index = time_diff / TID_QUEUE_CELL_SPACING;
336
337         /* The history is too long: remove data that is older than */
338         /* TID_MAX_TIME_DIFF */
339         if (index >= TID_QUEUE_MAX_SIZE)
340                 rs_tl_rm_old_stats(tl, curr_time);
341
342         return tl->total;
343 }
344
345 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
346                                 struct iwl4965_lq_sta *lq_data, u8 tid,
347                                 struct sta_info *sta)
348 {
349         unsigned long state;
350         DECLARE_MAC_BUF(mac);
351
352         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
353         state = sta->ampdu_mlme.tid_state_tx[tid];
354         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
355
356         if (state == HT_AGG_STATE_IDLE &&
357             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
358                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
359                                 print_mac(mac, sta->addr), tid);
360                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
361         }
362 }
363
364 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
365                                 struct iwl4965_lq_sta *lq_data,
366                                 struct sta_info *sta)
367 {
368         if ((tid < TID_MAX_LOAD_COUNT))
369                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
370         else if (tid == IWL_AGG_ALL_TID)
371                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
372                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
373 }
374
375 #endif /* CONFIG_IWLWIFI_HT */
376
377 /**
378  * rs_collect_tx_data - Update the success/failure sliding window
379  *
380  * We keep a sliding window of the last 62 packets transmitted
381  * at this rate.  window->data contains the bitmask of successful
382  * packets.
383  */
384 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
385                               int scale_index, s32 tpt, int retries,
386                               int successes)
387 {
388         struct iwl4965_rate_scale_data *window = NULL;
389         u64 mask;
390         u8 win_size = IWL_RATE_MAX_WINDOW;
391         s32 fail_count;
392
393         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
394                 return -EINVAL;
395
396         /* Select data for current tx bit rate */
397         window = &(windows[scale_index]);
398
399         /*
400          * Keep track of only the latest 62 tx frame attempts in this rate's
401          * history window; anything older isn't really relevant any more.
402          * If we have filled up the sliding window, drop the oldest attempt;
403          * if the oldest attempt (highest bit in bitmap) shows "success",
404          * subtract "1" from the success counter (this is the main reason
405          * we keep these bitmaps!).
406          */
407         while (retries > 0) {
408                 if (window->counter >= win_size) {
409                         window->counter = win_size - 1;
410                         mask = 1;
411                         mask = (mask << (win_size - 1));
412                         if (window->data & mask) {
413                                 window->data &= ~mask;
414                                 window->success_counter =
415                                         window->success_counter - 1;
416                         }
417                 }
418
419                 /* Increment frames-attempted counter */
420                 window->counter++;
421
422                 /* Shift bitmap by one frame (throw away oldest history),
423                  * OR in "1", and increment "success" if this
424                  * frame was successful. */
425                 mask = window->data;
426                 window->data = (mask << 1);
427                 if (successes > 0) {
428                         window->success_counter = window->success_counter + 1;
429                         window->data |= 0x1;
430                         successes--;
431                 }
432
433                 retries--;
434         }
435
436         /* Calculate current success ratio, avoid divide-by-0! */
437         if (window->counter > 0)
438                 window->success_ratio = 128 * (100 * window->success_counter)
439                                         / window->counter;
440         else
441                 window->success_ratio = IWL_INVALID_VALUE;
442
443         fail_count = window->counter - window->success_counter;
444
445         /* Calculate average throughput, if we have enough history. */
446         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
447             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
448                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
449         else
450                 window->average_tpt = IWL_INVALID_VALUE;
451
452         /* Tag this window as having been updated */
453         window->stamp = jiffies;
454
455         return 0;
456 }
457
458 /*
459  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
460  */
461 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
462                            struct iwl4965_scale_tbl_info *tbl,
463                            int index, u8 use_green)
464 {
465         if (is_legacy(tbl->lq_type)) {
466                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
467                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
468                         mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
469
470         } else if (is_siso(tbl->lq_type)) {
471                 if (index > IWL_LAST_OFDM_RATE)
472                         index = IWL_LAST_OFDM_RATE;
473                  mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
474                                           RATE_MCS_HT_MSK;
475         } else {
476                 if (index > IWL_LAST_OFDM_RATE)
477                         index = IWL_LAST_OFDM_RATE;
478                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
479                                          RATE_MCS_HT_MSK;
480         }
481
482         switch (tbl->antenna_type) {
483         case ANT_BOTH:
484                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
485                 break;
486         case ANT_MAIN:
487                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
488                 break;
489         case ANT_AUX:
490                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
491                 break;
492         case ANT_NONE:
493                 break;
494         }
495
496         if (is_legacy(tbl->lq_type))
497                 return;
498
499         if (tbl->is_fat) {
500                 if (tbl->is_dup)
501                         mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
502                 else
503                         mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
504         }
505         if (tbl->is_SGI)
506                 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
507
508         if (use_green) {
509                 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
510                 if (is_siso(tbl->lq_type))
511                         mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
512         }
513 }
514
515 /*
516  * Interpret uCode API's rate_n_flags format,
517  * fill "search" or "active" tx mode table.
518  */
519 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
520                                     enum ieee80211_band band,
521                                     struct iwl4965_scale_tbl_info *tbl,
522                                     int *rate_idx)
523 {
524         int index;
525         u32 ant_msk;
526
527         index = iwl4965_hwrate_to_plcp_idx(mcs_rate->rate_n_flags);
528
529         if (index  == IWL_RATE_INVALID) {
530                 *rate_idx = -1;
531                 return -EINVAL;
532         }
533         tbl->is_SGI = 0;        /* default legacy setup */
534         tbl->is_fat = 0;
535         tbl->is_dup = 0;
536         tbl->antenna_type = ANT_BOTH;   /* default MIMO setup */
537
538         /* legacy rate format */
539         if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
540                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
541
542                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
543                         tbl->lq_type = LQ_NONE;
544                 else {
545
546                         if (band == IEEE80211_BAND_5GHZ)
547                                 tbl->lq_type = LQ_A;
548                         else
549                                 tbl->lq_type = LQ_G;
550
551                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
552                                 tbl->antenna_type = ANT_MAIN;
553                         else
554                                 tbl->antenna_type = ANT_AUX;
555                 }
556                 *rate_idx = index;
557
558         /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
559         } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
560                                         <= IWL_RATE_SISO_60M_PLCP) {
561                 tbl->lq_type = LQ_SISO;
562
563                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
564                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
565                         tbl->lq_type = LQ_NONE;
566                 else {
567                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
568                                 tbl->antenna_type = ANT_MAIN;
569                         else
570                                 tbl->antenna_type = ANT_AUX;
571                 }
572                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
573                         tbl->is_SGI = 1;
574
575                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
576                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
577                         tbl->is_fat = 1;
578
579                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
580                         tbl->is_dup = 1;
581
582                 *rate_idx = index;
583
584         /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
585         } else {
586                 tbl->lq_type = LQ_MIMO;
587                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
588                         tbl->is_SGI = 1;
589
590                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
591                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
592                         tbl->is_fat = 1;
593
594                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
595                         tbl->is_dup = 1;
596                 *rate_idx = index;
597         }
598         return 0;
599 }
600
601 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
602                                      struct iwl4965_scale_tbl_info *tbl)
603 {
604         if (tbl->antenna_type == ANT_AUX) {
605                 tbl->antenna_type = ANT_MAIN;
606                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
607                 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
608         } else {
609                 tbl->antenna_type = ANT_AUX;
610                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
611                 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
612         }
613 }
614
615 static inline u8 rs_use_green(struct iwl_priv *priv,
616                               struct ieee80211_conf *conf)
617 {
618 #ifdef CONFIG_IWL4965_HT
619         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
620                 priv->current_ht_config.is_green_field &&
621                 !priv->current_ht_config.non_GF_STA_present);
622 #endif  /* CONFIG_IWL4965_HT */
623         return 0;
624 }
625
626 /**
627  * rs_get_supported_rates - get the available rates
628  *
629  * if management frame or broadcast frame only return
630  * basic available rates.
631  *
632  */
633 static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
634                                    struct ieee80211_hdr *hdr,
635                                    enum iwl4965_table_type rate_type,
636                                    u16 *data_rate)
637 {
638         if (is_legacy(rate_type))
639                 *data_rate = lq_sta->active_rate;
640         else {
641                 if (is_siso(rate_type))
642                         *data_rate = lq_sta->active_siso_rate;
643                 else
644                         *data_rate = lq_sta->active_mimo_rate;
645         }
646
647         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
648             lq_sta->active_rate_basic) {
649                 *data_rate = lq_sta->active_rate_basic;
650         }
651 }
652
653 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
654 {
655         u8 high = IWL_RATE_INVALID;
656         u8 low = IWL_RATE_INVALID;
657
658         /* 802.11A or ht walks to the next literal adjacent rate in
659          * the rate table */
660         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
661                 int i;
662                 u32 mask;
663
664                 /* Find the previous rate that is in the rate mask */
665                 i = index - 1;
666                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
667                         if (rate_mask & mask) {
668                                 low = i;
669                                 break;
670                         }
671                 }
672
673                 /* Find the next rate that is in the rate mask */
674                 i = index + 1;
675                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
676                         if (rate_mask & mask) {
677                                 high = i;
678                                 break;
679                         }
680                 }
681
682                 return (high << 8) | low;
683         }
684
685         low = index;
686         while (low != IWL_RATE_INVALID) {
687                 low = iwl4965_rates[low].prev_rs;
688                 if (low == IWL_RATE_INVALID)
689                         break;
690                 if (rate_mask & (1 << low))
691                         break;
692                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
693         }
694
695         high = index;
696         while (high != IWL_RATE_INVALID) {
697                 high = iwl4965_rates[high].next_rs;
698                 if (high == IWL_RATE_INVALID)
699                         break;
700                 if (rate_mask & (1 << high))
701                         break;
702                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
703         }
704
705         return (high << 8) | low;
706 }
707
708 static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
709                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
710                              u8 ht_possible, struct iwl4965_rate *mcs_rate)
711 {
712         s32 low;
713         u16 rate_mask;
714         u16 high_low;
715         u8 switch_to_legacy = 0;
716         u8 is_green = lq_sta->is_green;
717
718         /* check if we need to switch from HT to legacy rates.
719          * assumption is that mandatory rates (1Mbps or 6Mbps)
720          * are always supported (spec demand) */
721         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
722                 switch_to_legacy = 1;
723                 scale_index = rs_ht_to_legacy[scale_index];
724                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
725                         tbl->lq_type = LQ_A;
726                 else
727                         tbl->lq_type = LQ_G;
728
729                 if ((tbl->antenna_type == ANT_BOTH) ||
730                     (tbl->antenna_type == ANT_NONE))
731                         tbl->antenna_type = ANT_MAIN;
732
733                 tbl->is_fat = 0;
734                 tbl->is_SGI = 0;
735         }
736
737         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
738
739         /* Mask with station rate restriction */
740         if (is_legacy(tbl->lq_type)) {
741                 /* supp_rates has no CCK bits in A mode */
742                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
743                         rate_mask  = (u16)(rate_mask &
744                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
745                 else
746                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
747         }
748
749         /* If we switched from HT to legacy, check current rate */
750         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
751                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
752                 return;
753         }
754
755         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
756         low = high_low & 0xff;
757
758         if (low != IWL_RATE_INVALID)
759                 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
760         else
761                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
762 }
763
764 /*
765  * mac80211 sends us Tx status
766  */
767 static void rs_tx_status(void *priv_rate, struct net_device *dev,
768                          struct sk_buff *skb,
769                          struct ieee80211_tx_status *tx_resp)
770 {
771         int status;
772         u8 retries;
773         int rs_index, index = 0;
774         struct iwl4965_lq_sta *lq_sta;
775         struct iwl_link_quality_cmd *table;
776         struct sta_info *sta;
777         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
778         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
779         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
780         struct ieee80211_hw *hw = local_to_hw(local);
781         struct iwl4965_rate_scale_data *window = NULL;
782         struct iwl4965_rate_scale_data *search_win = NULL;
783         struct iwl4965_rate tx_mcs;
784         struct iwl4965_scale_tbl_info tbl_type;
785         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
786         u8 active_index = 0;
787         u16 fc = le16_to_cpu(hdr->frame_control);
788         s32 tpt = 0;
789
790         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
791
792         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
793                 return;
794
795         /* This packet was aggregated but doesn't carry rate scale info */
796         if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
797             !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
798                 return;
799
800         retries = tx_resp->retry_count;
801
802         if (retries > 15)
803                 retries = 15;
804
805         rcu_read_lock();
806
807         sta = sta_info_get(local, hdr->addr1);
808
809         if (!sta || !sta->rate_ctrl_priv)
810                 goto out;
811
812
813         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
814
815         if (!priv->lq_mngr.lq_ready)
816                 goto out;
817
818         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
819             !lq_sta->ibss_sta_added)
820                 goto out;
821
822         table = &lq_sta->lq;
823         active_index = lq_sta->active_tbl;
824
825         /* Get mac80211 antenna info */
826         lq_sta->antenna =
827                 (lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx);
828         if (!lq_sta->antenna)
829                 lq_sta->antenna = lq_sta->valid_antenna;
830
831         /* Ignore mac80211 antenna info for now */
832         lq_sta->antenna = lq_sta->valid_antenna;
833
834         curr_tbl = &(lq_sta->lq_info[active_index]);
835         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
836         window = (struct iwl4965_rate_scale_data *)
837             &(curr_tbl->win[0]);
838         search_win = (struct iwl4965_rate_scale_data *)
839             &(search_tbl->win[0]);
840
841         /*
842          * Ignore this Tx frame response if its initial rate doesn't match
843          * that of latest Link Quality command.  There may be stragglers
844          * from a previous Link Quality command, but we're no longer interested
845          * in those; they're either from the "active" mode while we're trying
846          * to check "search" mode, or a prior "search" mode after we've moved
847          * to a new "search" mode (which might become the new "active" mode).
848          */
849         tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[0].rate_n_flags);
850         rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
851         if (priv->band == IEEE80211_BAND_5GHZ)
852                 rs_index -= IWL_FIRST_OFDM_RATE;
853
854         if ((tx_resp->control.tx_rate == NULL) ||
855             (tbl_type.is_SGI ^
856                 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
857             (tbl_type.is_fat ^
858                 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
859             (tbl_type.is_dup ^
860                 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
861             (tbl_type.antenna_type ^
862                 tx_resp->control.antenna_sel_tx) ||
863             (!!(tx_mcs.rate_n_flags & RATE_MCS_HT_MSK) ^
864                 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
865             (!!(tx_mcs.rate_n_flags & RATE_MCS_GF_MSK) ^
866                 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
867             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
868                 tx_resp->control.tx_rate->bitrate)) {
869                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
870                                 tx_mcs.rate_n_flags);
871                 goto out;
872         }
873
874         /* Update frame history window with "failure" for each Tx retry. */
875         while (retries) {
876                 /* Look up the rate and other info used for each tx attempt.
877                  * Each tx attempt steps one entry deeper in the rate table. */
878                 tx_mcs.rate_n_flags =
879                     le32_to_cpu(table->rs_table[index].rate_n_flags);
880                 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band,
881                                           &tbl_type, &rs_index);
882
883                 /* If type matches "search" table,
884                  * add failure to "search" history */
885                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
886                     (tbl_type.antenna_type == search_tbl->antenna_type) &&
887                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
888                         if (search_tbl->expected_tpt)
889                                 tpt = search_tbl->expected_tpt[rs_index];
890                         else
891                                 tpt = 0;
892                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
893
894                 /* Else if type matches "current/active" table,
895                  * add failure to "current/active" history */
896                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
897                            (tbl_type.antenna_type == curr_tbl->antenna_type) &&
898                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
899                         if (curr_tbl->expected_tpt)
900                                 tpt = curr_tbl->expected_tpt[rs_index];
901                         else
902                                 tpt = 0;
903                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
904                 }
905
906                 /* If not searching for a new mode, increment failed counter
907                  * ... this helps determine when to start searching again */
908                 if (lq_sta->stay_in_tbl)
909                         lq_sta->total_failed++;
910                 --retries;
911                 index++;
912
913         }
914
915         /*
916          * Find (by rate) the history window to update with final Tx attempt;
917          * if Tx was successful first try, use original rate,
918          * else look up the rate that was, finally, successful.
919          */
920         tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags);
921         rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
922
923         /* Update frame history window with "success" if Tx got ACKed ... */
924         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
925                 status = 1;
926         else
927                 status = 0;
928
929         /* If type matches "search" table,
930          * add final tx status to "search" history */
931         if ((tbl_type.lq_type == search_tbl->lq_type) &&
932             (tbl_type.antenna_type == search_tbl->antenna_type) &&
933             (tbl_type.is_SGI == search_tbl->is_SGI)) {
934                 if (search_tbl->expected_tpt)
935                         tpt = search_tbl->expected_tpt[rs_index];
936                 else
937                         tpt = 0;
938                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
939                         rs_collect_tx_data(search_win, rs_index, tpt,
940                                            tx_resp->ampdu_ack_len,
941                                            tx_resp->ampdu_ack_map);
942                 else
943                         rs_collect_tx_data(search_win, rs_index, tpt,
944                                            1, status);
945         /* Else if type matches "current/active" table,
946          * add final tx status to "current/active" history */
947         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
948                    (tbl_type.antenna_type == curr_tbl->antenna_type) &&
949                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
950                 if (curr_tbl->expected_tpt)
951                         tpt = curr_tbl->expected_tpt[rs_index];
952                 else
953                         tpt = 0;
954                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
955                         rs_collect_tx_data(window, rs_index, tpt,
956                                            tx_resp->ampdu_ack_len,
957                                            tx_resp->ampdu_ack_map);
958                 else
959                         rs_collect_tx_data(window, rs_index, tpt,
960                                            1, status);
961         }
962
963         /* If not searching for new mode, increment success/failed counter
964          * ... these help determine when to start searching again */
965         if (lq_sta->stay_in_tbl) {
966                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
967                         lq_sta->total_success += tx_resp->ampdu_ack_map;
968                         lq_sta->total_failed +=
969                              (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
970                 } else {
971                         if (status)
972                                 lq_sta->total_success++;
973                         else
974                                 lq_sta->total_failed++;
975                 }
976         }
977
978         /* See if there's a better rate or modulation mode to try. */
979         rs_rate_scale_perform(priv, dev, hdr, sta);
980 out:
981         rcu_read_unlock();
982         return;
983 }
984
985 static u8 rs_is_ant_connected(u8 valid_antenna,
986                               enum iwl4965_antenna_type antenna_type)
987 {
988         if (antenna_type == ANT_AUX)
989                 return ((valid_antenna & 0x2) ? 1:0);
990         else if (antenna_type == ANT_MAIN)
991                 return ((valid_antenna & 0x1) ? 1:0);
992         else if (antenna_type == ANT_BOTH)
993                 return ((valid_antenna & 0x3) == 0x3);
994
995         return 1;
996 }
997
998 static u8 rs_is_other_ant_connected(u8 valid_antenna,
999                                     enum iwl4965_antenna_type antenna_type)
1000 {
1001         if (antenna_type == ANT_AUX)
1002                 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
1003         else
1004                 return rs_is_ant_connected(valid_antenna, ANT_AUX);
1005
1006         return 0;
1007 }
1008
1009 /*
1010  * Begin a period of staying with a selected modulation mode.
1011  * Set "stay_in_tbl" flag to prevent any mode switches.
1012  * Set frame tx success limits according to legacy vs. high-throughput,
1013  * and reset overall (spanning all rates) tx success history statistics.
1014  * These control how long we stay using same modulation mode before
1015  * searching for a new mode.
1016  */
1017 static void rs_set_stay_in_table(u8 is_legacy,
1018                                  struct iwl4965_lq_sta *lq_sta)
1019 {
1020         IWL_DEBUG_HT("we are staying in the same table\n");
1021         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1022         if (is_legacy) {
1023                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1024                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1025                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1026         } else {
1027                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1028                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1029                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1030         }
1031         lq_sta->table_count = 0;
1032         lq_sta->total_failed = 0;
1033         lq_sta->total_success = 0;
1034 }
1035
1036 /*
1037  * Find correct throughput table for given mode of modulation
1038  */
1039 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1040                                       struct iwl4965_scale_tbl_info *tbl)
1041 {
1042         if (is_legacy(tbl->lq_type)) {
1043                 if (!is_a_band(tbl->lq_type))
1044                         tbl->expected_tpt = expected_tpt_G;
1045                 else
1046                         tbl->expected_tpt = expected_tpt_A;
1047         } else if (is_siso(tbl->lq_type)) {
1048                 if (tbl->is_fat && !lq_sta->is_dup)
1049                         if (tbl->is_SGI)
1050                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1051                         else
1052                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1053                 else if (tbl->is_SGI)
1054                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1055                 else
1056                         tbl->expected_tpt = expected_tpt_siso20MHz;
1057
1058         } else if (is_mimo(tbl->lq_type)) {
1059                 if (tbl->is_fat && !lq_sta->is_dup)
1060                         if (tbl->is_SGI)
1061                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1062                         else
1063                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1064                 else if (tbl->is_SGI)
1065                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1066                 else
1067                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1068         } else
1069                 tbl->expected_tpt = expected_tpt_G;
1070 }
1071
1072 #ifdef CONFIG_IWL4965_HT
1073 /*
1074  * Find starting rate for new "search" high-throughput mode of modulation.
1075  * Goal is to find lowest expected rate (under perfect conditions) that is
1076  * above the current measured throughput of "active" mode, to give new mode
1077  * a fair chance to prove itself without too many challenges.
1078  *
1079  * This gets called when transitioning to more aggressive modulation
1080  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1081  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1082  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1083  * bit rate will typically need to increase, but not if performance was bad.
1084  */
1085 static s32 rs_get_best_rate(struct iwl_priv *priv,
1086                             struct iwl4965_lq_sta *lq_sta,
1087                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
1088                             u16 rate_mask, s8 index, s8 rate)
1089 {
1090         /* "active" values */
1091         struct iwl4965_scale_tbl_info *active_tbl =
1092             &(lq_sta->lq_info[lq_sta->active_tbl]);
1093         s32 active_sr = active_tbl->win[index].success_ratio;
1094         s32 active_tpt = active_tbl->expected_tpt[index];
1095
1096         /* expected "search" throughput */
1097         s32 *tpt_tbl = tbl->expected_tpt;
1098
1099         s32 new_rate, high, low, start_hi;
1100         u16 high_low;
1101
1102         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1103
1104         for (; ;) {
1105                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1106
1107                 low = high_low & 0xff;
1108                 high = (high_low >> 8) & 0xff;
1109
1110                 /*
1111                  * Lower the "search" bit rate, to give new "search" mode
1112                  * approximately the same throughput as "active" if:
1113                  *
1114                  * 1) "Active" mode has been working modestly well (but not
1115                  *    great), and expected "search" throughput (under perfect
1116                  *    conditions) at candidate rate is above the actual
1117                  *    measured "active" throughput (but less than expected
1118                  *    "active" throughput under perfect conditions).
1119                  * OR
1120                  * 2) "Active" mode has been working perfectly or very well
1121                  *    and expected "search" throughput (under perfect
1122                  *    conditions) at candidate rate is above expected
1123                  *    "active" throughput (under perfect conditions).
1124                  */
1125                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1126                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1127                       (active_sr <= IWL_RATE_HIGH_TH) &&
1128                       (tpt_tbl[rate] <= active_tpt))) ||
1129                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1130                      (tpt_tbl[rate] > active_tpt))) {
1131
1132                         /* (2nd or later pass)
1133                          * If we've already tried to raise the rate, and are
1134                          * now trying to lower it, use the higher rate. */
1135                         if (start_hi != IWL_RATE_INVALID) {
1136                                 new_rate = start_hi;
1137                                 break;
1138                         }
1139
1140                         new_rate = rate;
1141
1142                         /* Loop again with lower rate */
1143                         if (low != IWL_RATE_INVALID)
1144                                 rate = low;
1145
1146                         /* Lower rate not available, use the original */
1147                         else
1148                                 break;
1149
1150                 /* Else try to raise the "search" rate to match "active" */
1151                 } else {
1152                         /* (2nd or later pass)
1153                          * If we've already tried to lower the rate, and are
1154                          * now trying to raise it, use the lower rate. */
1155                         if (new_rate != IWL_RATE_INVALID)
1156                                 break;
1157
1158                         /* Loop again with higher rate */
1159                         else if (high != IWL_RATE_INVALID) {
1160                                 start_hi = high;
1161                                 rate = high;
1162
1163                         /* Higher rate not available, use the original */
1164                         } else {
1165                                 new_rate = rate;
1166                                 break;
1167                         }
1168                 }
1169         }
1170
1171         return new_rate;
1172 }
1173 #endif                          /* CONFIG_IWL4965_HT */
1174
1175 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1176 {
1177         return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1178 }
1179
1180 /*
1181  * Set up search table for MIMO
1182  */
1183 static int rs_switch_to_mimo(struct iwl_priv *priv,
1184                              struct iwl4965_lq_sta *lq_sta,
1185                              struct ieee80211_conf *conf,
1186                              struct sta_info *sta,
1187                              struct iwl4965_scale_tbl_info *tbl, int index)
1188 {
1189 #ifdef CONFIG_IWL4965_HT
1190         u16 rate_mask;
1191         s32 rate;
1192         s8 is_green = lq_sta->is_green;
1193
1194         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1195             !sta->ht_info.ht_supported)
1196                 return -1;
1197
1198         IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1199         tbl->lq_type = LQ_MIMO;
1200         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1201                                 &rate_mask);
1202
1203         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1204                 return -1;
1205
1206         /* Need both Tx chains/antennas to support MIMO */
1207         if (!rs_is_both_ant_supp(lq_sta->antenna))
1208                 return -1;
1209
1210         tbl->is_dup = lq_sta->is_dup;
1211         tbl->action = 0;
1212         if (priv->current_ht_config.supported_chan_width
1213             == IWL_CHANNEL_WIDTH_40MHZ)
1214                 tbl->is_fat = 1;
1215         else
1216                 tbl->is_fat = 0;
1217
1218         if (tbl->is_fat) {
1219                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1220                         tbl->is_SGI = 1;
1221                 else
1222                         tbl->is_SGI = 0;
1223         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1224                 tbl->is_SGI = 1;
1225         else
1226                 tbl->is_SGI = 0;
1227
1228         rs_get_expected_tpt_table(lq_sta, tbl);
1229
1230         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1231
1232         IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1233         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1234                 return -1;
1235         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1236
1237         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1238                      tbl->current_rate.rate_n_flags, is_green);
1239         return 0;
1240 #else
1241         return -1;
1242 #endif  /*CONFIG_IWL4965_HT */
1243 }
1244
1245 /*
1246  * Set up search table for SISO
1247  */
1248 static int rs_switch_to_siso(struct iwl_priv *priv,
1249                              struct iwl4965_lq_sta *lq_sta,
1250                              struct ieee80211_conf *conf,
1251                              struct sta_info *sta,
1252                              struct iwl4965_scale_tbl_info *tbl, int index)
1253 {
1254 #ifdef CONFIG_IWL4965_HT
1255         u16 rate_mask;
1256         u8 is_green = lq_sta->is_green;
1257         s32 rate;
1258
1259         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1260         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1261             !sta->ht_info.ht_supported)
1262                 return -1;
1263
1264         tbl->is_dup = lq_sta->is_dup;
1265         tbl->lq_type = LQ_SISO;
1266         tbl->action = 0;
1267         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1268                                 &rate_mask);
1269
1270         if (priv->current_ht_config.supported_chan_width
1271             == IWL_CHANNEL_WIDTH_40MHZ)
1272                 tbl->is_fat = 1;
1273         else
1274                 tbl->is_fat = 0;
1275
1276         if (tbl->is_fat) {
1277                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1278                         tbl->is_SGI = 1;
1279                 else
1280                         tbl->is_SGI = 0;
1281         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1282                 tbl->is_SGI = 1;
1283         else
1284                 tbl->is_SGI = 0;
1285
1286         if (is_green)
1287                 tbl->is_SGI = 0;
1288
1289         rs_get_expected_tpt_table(lq_sta, tbl);
1290         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1291
1292         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1293         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1294                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1295                              rate, rate_mask);
1296                 return -1;
1297         }
1298         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1299         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1300                      tbl->current_rate.rate_n_flags, is_green);
1301         return 0;
1302 #else
1303         return -1;
1304
1305 #endif  /*CONFIG_IWL4965_HT */
1306 }
1307
1308 /*
1309  * Try to switch to new modulation mode from legacy
1310  */
1311 static int rs_move_legacy_other(struct iwl_priv *priv,
1312                                 struct iwl4965_lq_sta *lq_sta,
1313                                 struct ieee80211_conf *conf,
1314                                 struct sta_info *sta,
1315                                 int index)
1316 {
1317         int ret = 0;
1318         struct iwl4965_scale_tbl_info *tbl =
1319             &(lq_sta->lq_info[lq_sta->active_tbl]);
1320         struct iwl4965_scale_tbl_info *search_tbl =
1321             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1322         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1323         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1324                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1325         u8 start_action = tbl->action;
1326
1327         for (; ;) {
1328                 switch (tbl->action) {
1329                 case IWL_LEGACY_SWITCH_ANTENNA:
1330                         IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1331
1332                         search_tbl->lq_type = LQ_NONE;
1333                         lq_sta->action_counter++;
1334
1335                         /* Don't change antenna if success has been great */
1336                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1337                                 break;
1338
1339                         /* Don't change antenna if other one is not connected */
1340                         if (!rs_is_other_ant_connected(lq_sta->antenna,
1341                                                         tbl->antenna_type))
1342                                 break;
1343
1344                         /* Set up search table to try other antenna */
1345                         memcpy(search_tbl, tbl, sz);
1346
1347                         rs_toggle_antenna(&(search_tbl->current_rate),
1348                                            search_tbl);
1349                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1350                         lq_sta->search_better_tbl = 1;
1351                         goto out;
1352
1353                 case IWL_LEGACY_SWITCH_SISO:
1354                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1355
1356                         /* Set up search table to try SISO */
1357                         memcpy(search_tbl, tbl, sz);
1358                         search_tbl->lq_type = LQ_SISO;
1359                         search_tbl->is_SGI = 0;
1360                         search_tbl->is_fat = 0;
1361                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1362                                                  search_tbl, index);
1363                         if (!ret) {
1364                                 lq_sta->search_better_tbl = 1;
1365                                 lq_sta->action_counter = 0;
1366                                 goto out;
1367                         }
1368
1369                         break;
1370                 case IWL_LEGACY_SWITCH_MIMO:
1371                         IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1372
1373                         /* Set up search table to try MIMO */
1374                         memcpy(search_tbl, tbl, sz);
1375                         search_tbl->lq_type = LQ_MIMO;
1376                         search_tbl->is_SGI = 0;
1377                         search_tbl->is_fat = 0;
1378                         search_tbl->antenna_type = ANT_BOTH;
1379                         ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1380                                                  search_tbl, index);
1381                         if (!ret) {
1382                                 lq_sta->search_better_tbl = 1;
1383                                 lq_sta->action_counter = 0;
1384                                 goto out;
1385                         }
1386                         break;
1387                 }
1388                 tbl->action++;
1389                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1390                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1391
1392                 if (tbl->action == start_action)
1393                         break;
1394
1395         }
1396         return 0;
1397
1398  out:
1399         tbl->action++;
1400         if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1401                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1402         return 0;
1403
1404 }
1405
1406 /*
1407  * Try to switch to new modulation mode from SISO
1408  */
1409 static int rs_move_siso_to_other(struct iwl_priv *priv,
1410                                  struct iwl4965_lq_sta *lq_sta,
1411                                  struct ieee80211_conf *conf,
1412                                  struct sta_info *sta,
1413                                  int index)
1414 {
1415         int ret;
1416         u8 is_green = lq_sta->is_green;
1417         struct iwl4965_scale_tbl_info *tbl =
1418             &(lq_sta->lq_info[lq_sta->active_tbl]);
1419         struct iwl4965_scale_tbl_info *search_tbl =
1420             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1421         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1422         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1423                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1424         u8 start_action = tbl->action;
1425
1426         for (;;) {
1427                 lq_sta->action_counter++;
1428                 switch (tbl->action) {
1429                 case IWL_SISO_SWITCH_ANTENNA:
1430                         IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1431                         search_tbl->lq_type = LQ_NONE;
1432                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1433                                 break;
1434                         if (!rs_is_other_ant_connected(lq_sta->antenna,
1435                                                        tbl->antenna_type))
1436                                 break;
1437
1438                         memcpy(search_tbl, tbl, sz);
1439                         search_tbl->action = IWL_SISO_SWITCH_MIMO;
1440                         rs_toggle_antenna(&(search_tbl->current_rate),
1441                                            search_tbl);
1442                         lq_sta->search_better_tbl = 1;
1443
1444                         goto out;
1445
1446                 case IWL_SISO_SWITCH_MIMO:
1447                         IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1448                         memcpy(search_tbl, tbl, sz);
1449                         search_tbl->lq_type = LQ_MIMO;
1450                         search_tbl->is_SGI = 0;
1451                         search_tbl->is_fat = 0;
1452                         search_tbl->antenna_type = ANT_BOTH;
1453                         ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1454                                                  search_tbl, index);
1455                         if (!ret) {
1456                                 lq_sta->search_better_tbl = 1;
1457                                 goto out;
1458                         }
1459                         break;
1460                 case IWL_SISO_SWITCH_GI:
1461                         IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1462
1463                         memcpy(search_tbl, tbl, sz);
1464                         search_tbl->action = 0;
1465                         if (search_tbl->is_SGI)
1466                                 search_tbl->is_SGI = 0;
1467                         else if (!is_green)
1468                                 search_tbl->is_SGI = 1;
1469                         else
1470                                 break;
1471                         lq_sta->search_better_tbl = 1;
1472                         if ((tbl->lq_type == LQ_SISO) &&
1473                             (tbl->is_SGI)) {
1474                                 s32 tpt = lq_sta->last_tpt / 100;
1475                                 if (((!tbl->is_fat) &&
1476                                      (tpt >= expected_tpt_siso20MHz[index])) ||
1477                                     ((tbl->is_fat) &&
1478                                      (tpt >= expected_tpt_siso40MHz[index])))
1479                                         lq_sta->search_better_tbl = 0;
1480                         }
1481                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1482                         rs_mcs_from_tbl(&search_tbl->current_rate,
1483                                              search_tbl, index, is_green);
1484                         goto out;
1485                 }
1486                 tbl->action++;
1487                 if (tbl->action > IWL_SISO_SWITCH_GI)
1488                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1489
1490                 if (tbl->action == start_action)
1491                         break;
1492         }
1493         return 0;
1494
1495  out:
1496         tbl->action++;
1497         if (tbl->action > IWL_SISO_SWITCH_GI)
1498                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1499         return 0;
1500 }
1501
1502 /*
1503  * Try to switch to new modulation mode from MIMO
1504  */
1505 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1506                                  struct iwl4965_lq_sta *lq_sta,
1507                                  struct ieee80211_conf *conf,
1508                                  struct sta_info *sta,
1509                                  int index)
1510 {
1511         int ret;
1512         s8 is_green = lq_sta->is_green;
1513         struct iwl4965_scale_tbl_info *tbl =
1514             &(lq_sta->lq_info[lq_sta->active_tbl]);
1515         struct iwl4965_scale_tbl_info *search_tbl =
1516             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1517         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1518                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1519         u8 start_action = tbl->action;
1520
1521         for (;;) {
1522                 lq_sta->action_counter++;
1523                 switch (tbl->action) {
1524                 case IWL_MIMO_SWITCH_ANTENNA_A:
1525                 case IWL_MIMO_SWITCH_ANTENNA_B:
1526                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1527
1528
1529                         /* Set up new search table for SISO */
1530                         memcpy(search_tbl, tbl, sz);
1531                         search_tbl->lq_type = LQ_SISO;
1532                         search_tbl->is_SGI = 0;
1533                         search_tbl->is_fat = 0;
1534                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1535                                 search_tbl->antenna_type = ANT_MAIN;
1536                         else
1537                                 search_tbl->antenna_type = ANT_AUX;
1538
1539                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1540                                                  search_tbl, index);
1541                         if (!ret) {
1542                                 lq_sta->search_better_tbl = 1;
1543                                 goto out;
1544                         }
1545                         break;
1546
1547                 case IWL_MIMO_SWITCH_GI:
1548                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1549
1550                         /* Set up new search table for MIMO */
1551                         memcpy(search_tbl, tbl, sz);
1552                         search_tbl->lq_type = LQ_MIMO;
1553                         search_tbl->antenna_type = ANT_BOTH;
1554                         search_tbl->action = 0;
1555                         if (search_tbl->is_SGI)
1556                                 search_tbl->is_SGI = 0;
1557                         else
1558                                 search_tbl->is_SGI = 1;
1559                         lq_sta->search_better_tbl = 1;
1560
1561                         /*
1562                          * If active table already uses the fastest possible
1563                          * modulation (dual stream with short guard interval),
1564                          * and it's working well, there's no need to look
1565                          * for a better type of modulation!
1566                          */
1567                         if ((tbl->lq_type == LQ_MIMO) &&
1568                             (tbl->is_SGI)) {
1569                                 s32 tpt = lq_sta->last_tpt / 100;
1570                                 if (((!tbl->is_fat) &&
1571                                      (tpt >= expected_tpt_mimo20MHz[index])) ||
1572                                     ((tbl->is_fat) &&
1573                                      (tpt >= expected_tpt_mimo40MHz[index])))
1574                                         lq_sta->search_better_tbl = 0;
1575                         }
1576                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1577                         rs_mcs_from_tbl(&search_tbl->current_rate,
1578                                              search_tbl, index, is_green);
1579                         goto out;
1580
1581                 }
1582                 tbl->action++;
1583                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1584                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1585
1586                 if (tbl->action == start_action)
1587                         break;
1588         }
1589
1590         return 0;
1591  out:
1592         tbl->action++;
1593         if (tbl->action > IWL_MIMO_SWITCH_GI)
1594                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1595         return 0;
1596
1597 }
1598
1599 /*
1600  * Check whether we should continue using same modulation mode, or
1601  * begin search for a new mode, based on:
1602  * 1) # tx successes or failures while using this mode
1603  * 2) # times calling this function
1604  * 3) elapsed time in this mode (not used, for now)
1605  */
1606 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1607 {
1608         struct iwl4965_scale_tbl_info *tbl;
1609         int i;
1610         int active_tbl;
1611         int flush_interval_passed = 0;
1612
1613         active_tbl = lq_sta->active_tbl;
1614
1615         tbl = &(lq_sta->lq_info[active_tbl]);
1616
1617         /* If we've been disallowing search, see if we should now allow it */
1618         if (lq_sta->stay_in_tbl) {
1619
1620                 /* Elapsed time using current modulation mode */
1621                 if (lq_sta->flush_timer)
1622                         flush_interval_passed =
1623                             time_after(jiffies,
1624                                        (unsigned long)(lq_sta->flush_timer +
1625                                         IWL_RATE_SCALE_FLUSH_INTVL));
1626
1627                 /* For now, disable the elapsed time criterion */
1628                 flush_interval_passed = 0;
1629
1630                 /*
1631                  * Check if we should allow search for new modulation mode.
1632                  * If many frames have failed or succeeded, or we've used
1633                  * this same modulation for a long time, allow search, and
1634                  * reset history stats that keep track of whether we should
1635                  * allow a new search.  Also (below) reset all bitmaps and
1636                  * stats in active history.
1637                  */
1638                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1639                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1640                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1641                      && (flush_interval_passed))) {
1642                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1643                                      lq_sta->total_failed,
1644                                      lq_sta->total_success,
1645                                      flush_interval_passed);
1646
1647                         /* Allow search for new mode */
1648                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1649                         lq_sta->total_failed = 0;
1650                         lq_sta->total_success = 0;
1651                         lq_sta->flush_timer = 0;
1652
1653                 /*
1654                  * Else if we've used this modulation mode enough repetitions
1655                  * (regardless of elapsed time or success/failure), reset
1656                  * history bitmaps and rate-specific stats for all rates in
1657                  * active table.
1658                  */
1659                 } else {
1660                         lq_sta->table_count++;
1661                         if (lq_sta->table_count >=
1662                             lq_sta->table_count_limit) {
1663                                 lq_sta->table_count = 0;
1664
1665                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1666                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1667                                         rs_rate_scale_clear_window(
1668                                                 &(tbl->win[i]));
1669                         }
1670                 }
1671
1672                 /* If transitioning to allow "search", reset all history
1673                  * bitmaps and stats in active table (this will become the new
1674                  * "search" table). */
1675                 if (!lq_sta->stay_in_tbl) {
1676                         for (i = 0; i < IWL_RATE_COUNT; i++)
1677                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1678                 }
1679         }
1680 }
1681
1682 /*
1683  * Do rate scaling and search for new modulation mode.
1684  */
1685 static void rs_rate_scale_perform(struct iwl_priv *priv,
1686                                   struct net_device *dev,
1687                                   struct ieee80211_hdr *hdr,
1688                                   struct sta_info *sta)
1689 {
1690         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1691         struct ieee80211_hw *hw = local_to_hw(local);
1692         struct ieee80211_conf *conf = &hw->conf;
1693         int low = IWL_RATE_INVALID;
1694         int high = IWL_RATE_INVALID;
1695         int index;
1696         int i;
1697         struct iwl4965_rate_scale_data *window = NULL;
1698         int current_tpt = IWL_INVALID_VALUE;
1699         int low_tpt = IWL_INVALID_VALUE;
1700         int high_tpt = IWL_INVALID_VALUE;
1701         u32 fail_count;
1702         s8 scale_action = 0;
1703         u16 fc, rate_mask;
1704         u8 update_lq = 0;
1705         struct iwl4965_lq_sta *lq_sta;
1706         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1707         u16 rate_scale_index_msk = 0;
1708         struct iwl4965_rate mcs_rate;
1709         u8 is_green = 0;
1710         u8 active_tbl = 0;
1711         u8 done_search = 0;
1712         u16 high_low;
1713 #ifdef CONFIG_IWL4965_HT
1714         u8 tid = MAX_TID_COUNT;
1715         __le16 *qc;
1716 #endif
1717
1718         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1719
1720         fc = le16_to_cpu(hdr->frame_control);
1721         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1722                 /* Send management frames and broadcast/multicast data using
1723                  * lowest rate. */
1724                 /* TODO: this could probably be improved.. */
1725                 return;
1726         }
1727
1728         if (!sta || !sta->rate_ctrl_priv)
1729                 return;
1730
1731         if (!priv->lq_mngr.lq_ready) {
1732                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1733                 return;
1734         }
1735         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1736
1737 #ifdef CONFIG_IWL4965_HT
1738         qc = ieee80211_get_qos_ctrl(hdr);
1739         if (qc) {
1740                 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1741                 rs_tl_add_packet(lq_sta, tid);
1742         }
1743 #endif
1744         /*
1745          * Select rate-scale / modulation-mode table to work with in
1746          * the rest of this function:  "search" if searching for better
1747          * modulation mode, or "active" if doing rate scaling within a mode.
1748          */
1749         if (!lq_sta->search_better_tbl)
1750                 active_tbl = lq_sta->active_tbl;
1751         else
1752                 active_tbl = 1 - lq_sta->active_tbl;
1753
1754         tbl = &(lq_sta->lq_info[active_tbl]);
1755         is_green = lq_sta->is_green;
1756
1757         /* current tx rate */
1758         index = sta->last_txrate_idx;
1759
1760         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1761                        tbl->lq_type);
1762
1763         /* rates available for this association, and for modulation mode */
1764         rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
1765                                 &rate_mask);
1766
1767         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1768
1769         /* mask with station rate restriction */
1770         if (is_legacy(tbl->lq_type)) {
1771                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1772                         /* supp_rates has no CCK bits in A mode */
1773                         rate_scale_index_msk = (u16) (rate_mask &
1774                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1775                 else
1776                         rate_scale_index_msk = (u16) (rate_mask &
1777                                                       lq_sta->supp_rates);
1778
1779         } else
1780                 rate_scale_index_msk = rate_mask;
1781
1782         if (!rate_scale_index_msk)
1783                 rate_scale_index_msk = rate_mask;
1784
1785         /* If current rate is no longer supported on current association,
1786          * or user changed preferences for rates, find a new supported rate. */
1787         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1788                 index = IWL_INVALID_VALUE;
1789                 update_lq = 1;
1790
1791                 /* get the highest available rate */
1792                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1793                         if ((1 << i) & rate_scale_index_msk)
1794                                 index = i;
1795                 }
1796
1797                 if (index == IWL_INVALID_VALUE) {
1798                         IWL_WARNING("Can not find a suitable rate\n");
1799                         return;
1800                 }
1801         }
1802
1803         /* Get expected throughput table and history window for current rate */
1804         if (!tbl->expected_tpt)
1805                 rs_get_expected_tpt_table(lq_sta, tbl);
1806
1807         window = &(tbl->win[index]);
1808
1809         /*
1810          * If there is not enough history to calculate actual average
1811          * throughput, keep analyzing results of more tx frames, without
1812          * changing rate or mode (bypass most of the rest of this function).
1813          * Set up new rate table in uCode only if old rate is not supported
1814          * in current association (use new rate found above).
1815          */
1816         fail_count = window->counter - window->success_counter;
1817         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1818              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1819             || (tbl->expected_tpt == NULL)) {
1820                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1821                                "for index %d\n",
1822                                window->success_counter, window->counter, index);
1823
1824                 /* Can't calculate this yet; not enough history */
1825                 window->average_tpt = IWL_INVALID_VALUE;
1826
1827                 /* Should we stay with this modulation mode,
1828                  * or search for a new one? */
1829                 rs_stay_in_table(lq_sta);
1830
1831                 /* Set up new rate table in uCode, if needed */
1832                 if (update_lq) {
1833                         rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1834                         rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1835                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1836                 }
1837                 goto out;
1838
1839         /* Else we have enough samples; calculate estimate of
1840          * actual average throughput */
1841         } else
1842                 window->average_tpt = ((window->success_ratio *
1843                                         tbl->expected_tpt[index] + 64) / 128);
1844
1845         /* If we are searching for better modulation mode, check success. */
1846         if (lq_sta->search_better_tbl) {
1847                 int success_limit = IWL_RATE_SCALE_SWITCH;
1848
1849                 /* If good success, continue using the "search" mode;
1850                  * no need to send new link quality command, since we're
1851                  * continuing to use the setup that we've been trying. */
1852                 if ((window->success_ratio > success_limit) ||
1853                     (window->average_tpt > lq_sta->last_tpt)) {
1854                         if (!is_legacy(tbl->lq_type)) {
1855                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1856                                              " rate suc %d current tpt %d"
1857                                              " old tpt %d\n",
1858                                              window->success_ratio,
1859                                              window->average_tpt,
1860                                              lq_sta->last_tpt);
1861                                 lq_sta->enable_counter = 1;
1862                         }
1863                         /* Swap tables; "search" becomes "active" */
1864                         lq_sta->active_tbl = active_tbl;
1865                         current_tpt = window->average_tpt;
1866
1867                 /* Else poor success; go back to mode in "active" table */
1868                 } else {
1869                         /* Nullify "search" table */
1870                         tbl->lq_type = LQ_NONE;
1871
1872                         /* Revert to "active" table */
1873                         active_tbl = lq_sta->active_tbl;
1874                         tbl = &(lq_sta->lq_info[active_tbl]);
1875
1876                         /* Revert to "active" rate and throughput info */
1877                         index = iwl4965_hwrate_to_plcp_idx(
1878                                 tbl->current_rate.rate_n_flags);
1879                         current_tpt = lq_sta->last_tpt;
1880
1881                         /* Need to set up a new rate table in uCode */
1882                         update_lq = 1;
1883                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1884                 }
1885
1886                 /* Either way, we've made a decision; modulation mode
1887                  * search is done, allow rate adjustment next time. */
1888                 lq_sta->search_better_tbl = 0;
1889                 done_search = 1;        /* Don't switch modes below! */
1890                 goto lq_update;
1891         }
1892
1893         /* (Else) not in search of better modulation mode, try for better
1894          * starting rate, while staying in this mode. */
1895         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1896                                         tbl->lq_type);
1897         low = high_low & 0xff;
1898         high = (high_low >> 8) & 0xff;
1899
1900         /* Collect measured throughputs for current and adjacent rates */
1901         current_tpt = window->average_tpt;
1902         if (low != IWL_RATE_INVALID)
1903                 low_tpt = tbl->win[low].average_tpt;
1904         if (high != IWL_RATE_INVALID)
1905                 high_tpt = tbl->win[high].average_tpt;
1906
1907         /* Assume rate increase */
1908         scale_action = 1;
1909
1910         /* Too many failures, decrease rate */
1911         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1912             (current_tpt == 0)) {
1913                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1914                 scale_action = -1;
1915
1916         /* No throughput measured yet for adjacent rates; try increase. */
1917         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1918                    (high_tpt == IWL_INVALID_VALUE))
1919                 scale_action = 1;
1920
1921         /* Both adjacent throughputs are measured, but neither one has better
1922          * throughput; we're using the best rate, don't change it! */
1923         else if ((low_tpt != IWL_INVALID_VALUE) &&
1924                  (high_tpt != IWL_INVALID_VALUE) &&
1925                  (low_tpt < current_tpt) &&
1926                  (high_tpt < current_tpt))
1927                 scale_action = 0;
1928
1929         /* At least one adjacent rate's throughput is measured,
1930          * and may have better performance. */
1931         else {
1932                 /* Higher adjacent rate's throughput is measured */
1933                 if (high_tpt != IWL_INVALID_VALUE) {
1934                         /* Higher rate has better throughput */
1935                         if (high_tpt > current_tpt)
1936                                 scale_action = 1;
1937                         else {
1938                                 IWL_DEBUG_RATE
1939                                     ("decrease rate because of high tpt\n");
1940                                 scale_action = -1;
1941                         }
1942
1943                 /* Lower adjacent rate's throughput is measured */
1944                 } else if (low_tpt != IWL_INVALID_VALUE) {
1945                         /* Lower rate has better throughput */
1946                         if (low_tpt > current_tpt) {
1947                                 IWL_DEBUG_RATE
1948                                     ("decrease rate because of low tpt\n");
1949                                 scale_action = -1;
1950                         } else
1951                                 scale_action = 1;
1952                 }
1953         }
1954
1955         /* Sanity check; asked for decrease, but success rate or throughput
1956          * has been good at old rate.  Don't change it. */
1957         if (scale_action == -1) {
1958                 if ((low != IWL_RATE_INVALID) &&
1959                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1960                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1961                         scale_action = 0;
1962
1963         /* Sanity check; asked for increase, but success rate has not been great
1964          * even at old rate, higher rate will be worse.  Don't change it. */
1965         } else if ((scale_action == 1) &&
1966                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1967                 scale_action = 0;
1968
1969         switch (scale_action) {
1970         case -1:
1971                 /* Decrease starting rate, update uCode's rate table */
1972                 if (low != IWL_RATE_INVALID) {
1973                         update_lq = 1;
1974                         index = low;
1975                 }
1976                 break;
1977         case 1:
1978                 /* Increase starting rate, update uCode's rate table */
1979                 if (high != IWL_RATE_INVALID) {
1980                         update_lq = 1;
1981                         index = high;
1982                 }
1983
1984                 break;
1985         case 0:
1986                 /* No change */
1987         default:
1988                 break;
1989         }
1990
1991         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1992                     "high %d type %d\n",
1993                      index, scale_action, low, high, tbl->lq_type);
1994
1995  lq_update:
1996         /* Replace uCode's rate table for the destination station. */
1997         if (update_lq) {
1998                 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1999                 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2000                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2001         }
2002
2003         /* Should we stay with this modulation mode, or search for a new one? */
2004         rs_stay_in_table(lq_sta);
2005
2006         /*
2007          * Search for new modulation mode if we're:
2008          * 1)  Not changing rates right now
2009          * 2)  Not just finishing up a search
2010          * 3)  Allowing a new search
2011          */
2012         if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
2013                 /* Save current throughput to compare with "search" throughput*/
2014                 lq_sta->last_tpt = current_tpt;
2015
2016                 /* Select a new "search" modulation mode to try.
2017                  * If one is found, set up the new "search" table. */
2018                 if (is_legacy(tbl->lq_type))
2019                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2020                 else if (is_siso(tbl->lq_type))
2021                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2022                 else
2023                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
2024
2025                 /* If new "search" mode was selected, set up in uCode table */
2026                 if (lq_sta->search_better_tbl) {
2027                         /* Access the "search" table, clear its history. */
2028                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2029                         for (i = 0; i < IWL_RATE_COUNT; i++)
2030                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2031
2032                         /* Use new "search" start rate */
2033                         index = iwl4965_hwrate_to_plcp_idx(
2034                                         tbl->current_rate.rate_n_flags);
2035
2036                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
2037                                      tbl->current_rate.rate_n_flags, index);
2038                         rs_fill_link_cmd(lq_sta, &tbl->current_rate,
2039                                          &lq_sta->lq);
2040                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2041                 }
2042
2043                 /* If the "active" (non-search) mode was legacy,
2044                  * and we've tried switching antennas,
2045                  * but we haven't been able to try HT modes (not available),
2046                  * stay with best antenna legacy modulation for a while
2047                  * before next round of mode comparisons. */
2048                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2049                 if (is_legacy(tbl1->lq_type) &&
2050 #ifdef CONFIG_IWL4965_HT
2051                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2052 #endif
2053                     (lq_sta->action_counter >= 1)) {
2054                         lq_sta->action_counter = 0;
2055                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
2056                         rs_set_stay_in_table(1, lq_sta);
2057                 }
2058
2059                 /* If we're in an HT mode, and all 3 mode switch actions
2060                  * have been tried and compared, stay in this best modulation
2061                  * mode for a while before next round of mode comparisons. */
2062                 if (lq_sta->enable_counter &&
2063                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2064 #ifdef CONFIG_IWL4965_HT
2065                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2066                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2067                             (tid != MAX_TID_COUNT)) {
2068                                 IWL_DEBUG_HT("try to aggregate tid %d\n", tid);
2069                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2070                         }
2071 #endif /*CONFIG_IWL4965_HT */
2072                         lq_sta->action_counter = 0;
2073                         rs_set_stay_in_table(0, lq_sta);
2074                 }
2075
2076         /*
2077          * Else, don't search for a new modulation mode.
2078          * Put new timestamp in stay-in-modulation-mode flush timer if:
2079          * 1)  Not changing rates right now
2080          * 2)  Not just finishing up a search
2081          * 3)  flush timer is empty
2082          */
2083         } else {
2084                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2085                         lq_sta->flush_timer = jiffies;
2086         }
2087
2088 out:
2089         rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
2090         i = index;
2091         sta->last_txrate_idx = i;
2092
2093         /* sta->txrate_idx is an index to A mode rates which start
2094          * at IWL_FIRST_OFDM_RATE
2095          */
2096         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2097                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2098         else
2099                 sta->txrate_idx = i;
2100
2101         return;
2102 }
2103
2104
2105 static void rs_initialize_lq(struct iwl_priv *priv,
2106                              struct ieee80211_conf *conf,
2107                              struct sta_info *sta)
2108 {
2109         int i;
2110         struct iwl4965_lq_sta *lq_sta;
2111         struct iwl4965_scale_tbl_info *tbl;
2112         u8 active_tbl = 0;
2113         int rate_idx;
2114         u8 use_green = rs_use_green(priv, conf);
2115         struct iwl4965_rate mcs_rate;
2116
2117         if (!sta || !sta->rate_ctrl_priv)
2118                 goto out;
2119
2120         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2121         i = sta->last_txrate_idx;
2122
2123         if ((lq_sta->lq.sta_id == 0xff) &&
2124             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2125                 goto out;
2126
2127         if (!lq_sta->search_better_tbl)
2128                 active_tbl = lq_sta->active_tbl;
2129         else
2130                 active_tbl = 1 - lq_sta->active_tbl;
2131
2132         tbl = &(lq_sta->lq_info[active_tbl]);
2133
2134         if ((i < 0) || (i >= IWL_RATE_COUNT))
2135                 i = 0;
2136
2137         mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
2138         mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
2139         mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
2140
2141         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2142                 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
2143
2144         tbl->antenna_type = ANT_AUX;
2145         rs_get_tbl_info_from_mcs(&mcs_rate, priv->band, tbl, &rate_idx);
2146         if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
2147             rs_toggle_antenna(&mcs_rate, tbl);
2148
2149         rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
2150         tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
2151         rs_get_expected_tpt_table(lq_sta, tbl);
2152         rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2153         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2154  out:
2155         return;
2156 }
2157
2158 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2159                         struct ieee80211_supported_band *sband,
2160                         struct sk_buff *skb,
2161                         struct rate_selection *sel)
2162 {
2163
2164         int i;
2165         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2166         struct ieee80211_conf *conf = &local->hw.conf;
2167         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2168         struct sta_info *sta;
2169         u16 fc;
2170         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2171         struct iwl4965_lq_sta *lq_sta;
2172
2173         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2174
2175         rcu_read_lock();
2176
2177         sta = sta_info_get(local, hdr->addr1);
2178
2179         /* Send management frames and broadcast/multicast data using lowest
2180          * rate. */
2181         fc = le16_to_cpu(hdr->frame_control);
2182         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2183             !sta || !sta->rate_ctrl_priv) {
2184                 sel->rate = rate_lowest(local, sband, sta);
2185                 goto out;
2186         }
2187
2188         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2189         i = sta->last_txrate_idx;
2190
2191         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2192             !lq_sta->ibss_sta_added) {
2193                 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2194                 DECLARE_MAC_BUF(mac);
2195
2196                 if (sta_id == IWL_INVALID_STATION) {
2197                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2198                                        print_mac(mac, hdr->addr1));
2199                         sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2200                                                         0, CMD_ASYNC, NULL);
2201                 }
2202                 if ((sta_id != IWL_INVALID_STATION)) {
2203                         lq_sta->lq.sta_id = sta_id;
2204                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2205                         lq_sta->ibss_sta_added = 1;
2206                         rs_initialize_lq(priv, conf, sta);
2207                 }
2208                 if (!lq_sta->ibss_sta_added)
2209                         goto done;
2210         }
2211
2212 done:
2213         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2214                 sel->rate = rate_lowest(local, sband, sta);
2215                 goto out;
2216         }
2217
2218         sel->rate = &priv->ieee_rates[i];
2219 out:
2220         rcu_read_unlock();
2221 }
2222
2223 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2224 {
2225         struct iwl4965_lq_sta *lq_sta;
2226         int i, j;
2227
2228         IWL_DEBUG_RATE("create station rate scale window\n");
2229
2230         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2231
2232         if (lq_sta == NULL)
2233                 return NULL;
2234         lq_sta->lq.sta_id = 0xff;
2235
2236
2237         for (j = 0; j < LQ_SIZE; j++)
2238                 for (i = 0; i < IWL_RATE_COUNT; i++)
2239                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2240
2241         return lq_sta;
2242 }
2243
2244 static void rs_rate_init(void *priv_rate, void *priv_sta,
2245                          struct ieee80211_local *local,
2246                          struct sta_info *sta)
2247 {
2248         int i, j;
2249         struct ieee80211_conf *conf = &local->hw.conf;
2250         struct ieee80211_supported_band *sband;
2251         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2252         struct iwl4965_lq_sta *lq_sta = priv_sta;
2253
2254         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2255
2256         lq_sta->flush_timer = 0;
2257         lq_sta->supp_rates = sta->supp_rates[sband->band];
2258         sta->txrate_idx = 3;
2259         for (j = 0; j < LQ_SIZE; j++)
2260                 for (i = 0; i < IWL_RATE_COUNT; i++)
2261                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2262
2263         IWL_DEBUG_RATE("rate scale global init\n");
2264         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2265          * the lowest or the highest rate.. Could consider using RSSI from
2266          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2267          * after assoc.. */
2268
2269         lq_sta->ibss_sta_added = 0;
2270         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2271                 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2272                 DECLARE_MAC_BUF(mac);
2273
2274                 /* for IBSS the call are from tasklet */
2275                 IWL_DEBUG_HT("LQ: ADD station %s\n",
2276                              print_mac(mac, sta->addr));
2277
2278                 if (sta_id == IWL_INVALID_STATION) {
2279                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2280                                        print_mac(mac, sta->addr));
2281                         sta_id = iwl4965_add_station_flags(priv, sta->addr,
2282                                                         0, CMD_ASYNC, NULL);
2283                 }
2284                 if ((sta_id != IWL_INVALID_STATION)) {
2285                         lq_sta->lq.sta_id = sta_id;
2286                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2287                 }
2288                 /* FIXME: this is w/a remove it later */
2289                 priv->assoc_station_added = 1;
2290         }
2291
2292         /* Find highest tx rate supported by hardware and destination station */
2293         for (i = 0; i < sband->n_bitrates; i++)
2294                 if (sta->supp_rates[sband->band] & BIT(i))
2295                         sta->txrate_idx = i;
2296
2297         sta->last_txrate_idx = sta->txrate_idx;
2298         /* WTF is with this bogus comment? A doesn't have cck rates */
2299         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2300         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2301                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2302
2303         lq_sta->is_dup = 0;
2304         lq_sta->valid_antenna = priv->valid_antenna;
2305         lq_sta->antenna = priv->antenna;
2306         lq_sta->is_green = rs_use_green(priv, conf);
2307         lq_sta->active_rate = priv->active_rate;
2308         lq_sta->active_rate &= ~(0x1000);
2309         lq_sta->active_rate_basic = priv->active_rate_basic;
2310         lq_sta->band = priv->band;
2311 #ifdef CONFIG_IWL4965_HT
2312         /*
2313          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2314          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2315          */
2316         lq_sta->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1);
2317         lq_sta->active_siso_rate |=
2318                         (priv->current_ht_config.supp_mcs_set[0] & 0x1);
2319         lq_sta->active_siso_rate &= ~((u16)0x2);
2320         lq_sta->active_siso_rate =
2321                         lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE;
2322
2323         /* Same here */
2324         lq_sta->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1);
2325         lq_sta->active_mimo_rate |=
2326                         (priv->current_ht_config.supp_mcs_set[1] & 0x1);
2327         lq_sta->active_mimo_rate &= ~((u16)0x2);
2328         lq_sta->active_mimo_rate =
2329                         lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2330         IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2331                      lq_sta->active_siso_rate,
2332                      lq_sta->active_mimo_rate);
2333         /* as default allow aggregation for all tids */
2334         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2335 #endif /*CONFIG_IWL4965_HT*/
2336 #ifdef CONFIG_MAC80211_DEBUGFS
2337         lq_sta->drv = priv;
2338 #endif
2339
2340         if (priv->assoc_station_added)
2341                 priv->lq_mngr.lq_ready = 1;
2342
2343         rs_initialize_lq(priv, conf, sta);
2344 }
2345
2346 static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
2347                             struct iwl4965_rate *tx_mcs,
2348                             struct iwl_link_quality_cmd *lq_cmd)
2349 {
2350         int index = 0;
2351         int rate_idx;
2352         int repeat_rate = 0;
2353         u8 ant_toggle_count = 0;
2354         u8 use_ht_possible = 1;
2355         struct iwl4965_rate new_rate;
2356         struct iwl4965_scale_tbl_info tbl_type = { 0 };
2357
2358         /* Override starting rate (index 0) if needed for debug purposes */
2359         rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
2360
2361         /* Interpret rate_n_flags */
2362         rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->band,
2363                                   &tbl_type, &rate_idx);
2364
2365         /* How many times should we repeat the initial rate? */
2366         if (is_legacy(tbl_type.lq_type)) {
2367                 ant_toggle_count = 1;
2368                 repeat_rate = IWL_NUMBER_TRY;
2369         } else
2370                 repeat_rate = IWL_HT_NUMBER_TRY;
2371
2372         lq_cmd->general_params.mimo_delimiter =
2373                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2374
2375         /* Fill 1st table entry (index 0) */
2376         lq_cmd->rs_table[index].rate_n_flags =
2377                         cpu_to_le32(tx_mcs->rate_n_flags);
2378         new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2379
2380         if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2381                 lq_cmd->general_params.single_stream_ant_msk
2382                         = LINK_QUAL_ANT_A_MSK;
2383         else
2384                 lq_cmd->general_params.single_stream_ant_msk
2385                         = LINK_QUAL_ANT_B_MSK;
2386
2387         index++;
2388         repeat_rate--;
2389
2390         /* Fill rest of rate table */
2391         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2392                 /* Repeat initial/next rate.
2393                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2394                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2395                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2396                         if (is_legacy(tbl_type.lq_type)) {
2397                                 if (ant_toggle_count <
2398                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2399                                         ant_toggle_count++;
2400                                 else {
2401                                         rs_toggle_antenna(&new_rate, &tbl_type);
2402                                         ant_toggle_count = 1;
2403                                 }
2404                         }
2405
2406                         /* Override next rate if needed for debug purposes */
2407                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2408
2409                         /* Fill next table entry */
2410                         lq_cmd->rs_table[index].rate_n_flags =
2411                                         cpu_to_le32(new_rate.rate_n_flags);
2412                         repeat_rate--;
2413                         index++;
2414                 }
2415
2416                 rs_get_tbl_info_from_mcs(&new_rate, lq_sta->band, &tbl_type,
2417                                                 &rate_idx);
2418
2419                 /* Indicate to uCode which entries might be MIMO.
2420                  * If initial rate was MIMO, this will finally end up
2421                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2422                 if (is_mimo(tbl_type.lq_type))
2423                         lq_cmd->general_params.mimo_delimiter = index;
2424
2425                 /* Get next rate */
2426                 rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2427                                   use_ht_possible, &new_rate);
2428
2429                 /* How many times should we repeat the next rate? */
2430                 if (is_legacy(tbl_type.lq_type)) {
2431                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2432                                 ant_toggle_count++;
2433                         else {
2434                                 rs_toggle_antenna(&new_rate, &tbl_type);
2435                                 ant_toggle_count = 1;
2436                         }
2437                         repeat_rate = IWL_NUMBER_TRY;
2438                 } else
2439                         repeat_rate = IWL_HT_NUMBER_TRY;
2440
2441                 /* Don't allow HT rates after next pass.
2442                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2443                 use_ht_possible = 0;
2444
2445                 /* Override next rate if needed for debug purposes */
2446                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2447
2448                 /* Fill next table entry */
2449                 lq_cmd->rs_table[index].rate_n_flags =
2450                                 cpu_to_le32(new_rate.rate_n_flags);
2451
2452                 index++;
2453                 repeat_rate--;
2454         }
2455
2456         lq_cmd->general_params.dual_stream_ant_msk = 3;
2457         lq_cmd->agg_params.agg_dis_start_th = 3;
2458         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2459 }
2460
2461 static void *rs_alloc(struct ieee80211_local *local)
2462 {
2463         return local->hw.priv;
2464 }
2465 /* rate scale requires free function to be implemented */
2466 static void rs_free(void *priv_rate)
2467 {
2468         return;
2469 }
2470
2471 static void rs_clear(void *priv_rate)
2472 {
2473         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2474
2475         IWL_DEBUG_RATE("enter\n");
2476
2477         priv->lq_mngr.lq_ready = 0;
2478
2479         IWL_DEBUG_RATE("leave\n");
2480 }
2481
2482 static void rs_free_sta(void *priv, void *priv_sta)
2483 {
2484         struct iwl4965_lq_sta *lq_sta = priv_sta;
2485
2486         IWL_DEBUG_RATE("enter\n");
2487         kfree(lq_sta);
2488         IWL_DEBUG_RATE("leave\n");
2489 }
2490
2491
2492 #ifdef CONFIG_MAC80211_DEBUGFS
2493 static int open_file_generic(struct inode *inode, struct file *file)
2494 {
2495         file->private_data = inode->i_private;
2496         return 0;
2497 }
2498 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2499                                 struct iwl4965_rate *mcs, int index)
2500 {
2501         u32 base_rate;
2502
2503         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2504                 base_rate = 0x800D;
2505         else
2506                 base_rate = 0x820A;
2507
2508         if (lq_sta->dbg_fixed.rate_n_flags) {
2509                 if (index < 12)
2510                         mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
2511                 else
2512                         mcs->rate_n_flags = base_rate;
2513                 IWL_DEBUG_RATE("Fixed rate ON\n");
2514                 return;
2515         }
2516
2517         IWL_DEBUG_RATE("Fixed rate OFF\n");
2518 }
2519
2520 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2521                         const char __user *user_buf, size_t count, loff_t *ppos)
2522 {
2523         struct iwl4965_lq_sta *lq_sta = file->private_data;
2524         char buf[64];
2525         int buf_size;
2526         u32 parsed_rate;
2527
2528         memset(buf, 0, sizeof(buf));
2529         buf_size = min(count, sizeof(buf) -  1);
2530         if (copy_from_user(buf, user_buf, buf_size))
2531                 return -EFAULT;
2532
2533         if (sscanf(buf, "%x", &parsed_rate) == 1)
2534                 lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
2535         else
2536                 lq_sta->dbg_fixed.rate_n_flags = 0;
2537
2538         lq_sta->active_rate = 0x0FFF;   /* 1 - 54 MBits, includes CCK */
2539         lq_sta->active_siso_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2540         lq_sta->active_mimo_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2541
2542         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2543                 lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
2544
2545         if (lq_sta->dbg_fixed.rate_n_flags) {
2546                 rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
2547                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2548         }
2549
2550         return count;
2551 }
2552
2553 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2554                         char __user *user_buf, size_t count, loff_t *ppos)
2555 {
2556         char buff[1024];
2557         int desc = 0;
2558         int i = 0;
2559
2560         struct iwl4965_lq_sta *lq_sta = file->private_data;
2561
2562         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2563         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2564                         lq_sta->total_failed, lq_sta->total_success,
2565                         lq_sta->active_rate);
2566         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2567                         lq_sta->dbg_fixed.rate_n_flags);
2568         desc += sprintf(buff+desc, "general:"
2569                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2570                 lq_sta->lq.general_params.flags,
2571                 lq_sta->lq.general_params.mimo_delimiter,
2572                 lq_sta->lq.general_params.single_stream_ant_msk,
2573                 lq_sta->lq.general_params.dual_stream_ant_msk);
2574
2575         desc += sprintf(buff+desc, "agg:"
2576                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2577                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2578                         lq_sta->lq.agg_params.agg_dis_start_th,
2579                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2580
2581         desc += sprintf(buff+desc,
2582                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2583                         lq_sta->lq.general_params.start_rate_index[0],
2584                         lq_sta->lq.general_params.start_rate_index[1],
2585                         lq_sta->lq.general_params.start_rate_index[2],
2586                         lq_sta->lq.general_params.start_rate_index[3]);
2587
2588
2589         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2590                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2591                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2592
2593         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2594 }
2595
2596 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2597         .write = rs_sta_dbgfs_scale_table_write,
2598         .read = rs_sta_dbgfs_scale_table_read,
2599         .open = open_file_generic,
2600 };
2601 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2602                         char __user *user_buf, size_t count, loff_t *ppos)
2603 {
2604         char buff[1024];
2605         int desc = 0;
2606         int i, j;
2607
2608         struct iwl4965_lq_sta *lq_sta = file->private_data;
2609         for (i = 0; i < LQ_SIZE; i++) {
2610                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2611                                 "rate=0x%X\n",
2612                                 lq_sta->active_tbl == i?"*":"x",
2613                                 lq_sta->lq_info[i].lq_type,
2614                                 lq_sta->lq_info[i].is_SGI,
2615                                 lq_sta->lq_info[i].is_fat,
2616                                 lq_sta->lq_info[i].is_dup,
2617                                 lq_sta->lq_info[i].current_rate.rate_n_flags);
2618                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2619                         desc += sprintf(buff+desc,
2620                                 "counter=%d success=%d %%=%d\n",
2621                                 lq_sta->lq_info[i].win[j].counter,
2622                                 lq_sta->lq_info[i].win[j].success_counter,
2623                                 lq_sta->lq_info[i].win[j].success_ratio);
2624                 }
2625         }
2626         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2627 }
2628
2629 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2630         .read = rs_sta_dbgfs_stats_table_read,
2631         .open = open_file_generic,
2632 };
2633
2634 static void rs_add_debugfs(void *priv, void *priv_sta,
2635                                         struct dentry *dir)
2636 {
2637         struct iwl4965_lq_sta *lq_sta = priv_sta;
2638         lq_sta->rs_sta_dbgfs_scale_table_file =
2639                 debugfs_create_file("rate_scale_table", 0600, dir,
2640                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2641         lq_sta->rs_sta_dbgfs_stats_table_file =
2642                 debugfs_create_file("rate_stats_table", 0600, dir,
2643                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2644 #ifdef CONFIG_IWL4965_HT
2645         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2646                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2647                 &lq_sta->tx_agg_tid_en);
2648 #endif
2649
2650 }
2651
2652 static void rs_remove_debugfs(void *priv, void *priv_sta)
2653 {
2654         struct iwl4965_lq_sta *lq_sta = priv_sta;
2655         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2656         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2657 #ifdef CONFIG_IWL4965_HT
2658         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2659 #endif
2660 }
2661 #endif
2662
2663 static struct rate_control_ops rs_ops = {
2664         .module = NULL,
2665         .name = RS_NAME,
2666         .tx_status = rs_tx_status,
2667         .get_rate = rs_get_rate,
2668         .rate_init = rs_rate_init,
2669         .clear = rs_clear,
2670         .alloc = rs_alloc,
2671         .free = rs_free,
2672         .alloc_sta = rs_alloc_sta,
2673         .free_sta = rs_free_sta,
2674 #ifdef CONFIG_MAC80211_DEBUGFS
2675         .add_sta_debugfs = rs_add_debugfs,
2676         .remove_sta_debugfs = rs_remove_debugfs,
2677 #endif
2678 };
2679
2680 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2681 {
2682         struct ieee80211_local *local = hw_to_local(hw);
2683         struct iwl_priv *priv = hw->priv;
2684         struct iwl4965_lq_sta *lq_sta;
2685         struct sta_info *sta;
2686         int cnt = 0, i;
2687         u32 samples = 0, success = 0, good = 0;
2688         unsigned long now = jiffies;
2689         u32 max_time = 0;
2690         u8 lq_type, antenna;
2691
2692         rcu_read_lock();
2693
2694         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2695         if (!sta || !sta->rate_ctrl_priv) {
2696                 if (sta)
2697                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2698                 else
2699                         IWL_DEBUG_RATE("leave - no station!\n");
2700                 rcu_read_unlock();
2701                 return sprintf(buf, "station %d not found\n", sta_id);
2702         }
2703
2704         lq_sta = (void *)sta->rate_ctrl_priv;
2705
2706         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2707         antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type;
2708
2709         if (is_legacy(lq_type))
2710                 i = IWL_RATE_54M_INDEX;
2711         else
2712                 i = IWL_RATE_60M_INDEX;
2713         while (1) {
2714                 u64 mask;
2715                 int j;
2716                 int active = lq_sta->active_tbl;
2717
2718                 cnt +=
2719                     sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2720
2721                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2722                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2723                         buf[cnt++] =
2724                                 (lq_sta->lq_info[active].win[i].data & mask)
2725                                 ? '1' : '0';
2726
2727                 samples += lq_sta->lq_info[active].win[i].counter;
2728                 good += lq_sta->lq_info[active].win[i].success_counter;
2729                 success += lq_sta->lq_info[active].win[i].success_counter *
2730                            iwl4965_rates[i].ieee;
2731
2732                 if (lq_sta->lq_info[active].win[i].stamp) {
2733                         int delta =
2734                                    jiffies_to_msecs(now -
2735                                    lq_sta->lq_info[active].win[i].stamp);
2736
2737                         if (delta > max_time)
2738                                 max_time = delta;
2739
2740                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2741                 } else
2742                         buf[cnt++] = '\n';
2743
2744                 j = iwl4965_get_prev_ieee_rate(i);
2745                 if (j == i)
2746                         break;
2747                 i = j;
2748         }
2749
2750         /* Display the average rate of all samples taken.
2751          *
2752          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2753          * added from iwl4965_rates is actually 2X the rate */
2754         if (samples)
2755                 cnt += sprintf(&buf[cnt],
2756                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2757                          "%3d%% success (%d good packets over %d tries)\n",
2758                          success / (2 * samples), (success * 5 / samples) % 10,
2759                          max_time, good * 100 / samples, good, samples);
2760         else
2761                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2762
2763         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2764                          "active_search %d rate index %d\n", lq_type, antenna,
2765                          lq_sta->search_better_tbl, sta->last_txrate_idx);
2766
2767         rcu_read_unlock();
2768         return cnt;
2769 }
2770
2771 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2772 {
2773         struct iwl_priv *priv = hw->priv;
2774
2775         priv->lq_mngr.lq_ready = 1;
2776 }
2777
2778 int iwl4965_rate_control_register(void)
2779 {
2780         return ieee80211_rate_control_register(&rs_ops);
2781 }
2782
2783 void iwl4965_rate_control_unregister(void)
2784 {
2785         ieee80211_rate_control_unregister(&rs_ops);
2786 }
2787