19dd9fd9c09acf2dae0c9692baad8e7916e115e6
[linux-2.6.git] / drivers / net / wireless / iwlwifi / iwl-agn-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  *  Intel Linux Wireless <ilw@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
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "iwl-dev.h"
39 #include "iwl-sta.h"
40 #include "iwl-core.h"
41
42 #define RS_NAME "iwl-agn-rs"
43
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY      1
46 #define IWL_HT_NUMBER_TRY   3
47
48 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
51
52 /* max time to accum history 2 seconds */
53 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
54
55 static u8 rs_ht_to_legacy[] = {
56         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
57         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58         IWL_RATE_6M_INDEX,
59         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
60         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
61         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
62         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
63 };
64
65 static const u8 ant_toggle_lookup[] = {
66         /*ANT_NONE -> */ ANT_NONE,
67         /*ANT_A    -> */ ANT_B,
68         /*ANT_B    -> */ ANT_C,
69         /*ANT_AB   -> */ ANT_BC,
70         /*ANT_C    -> */ ANT_A,
71         /*ANT_AC   -> */ ANT_AB,
72         /*ANT_BC   -> */ ANT_AC,
73         /*ANT_ABC  -> */ ANT_ABC,
74 };
75
76 /**
77  * struct iwl_rate_scale_data -- tx success history for one rate
78  */
79 struct iwl_rate_scale_data {
80         u64 data;               /* bitmap of successful frames */
81         s32 success_counter;    /* number of frames successful */
82         s32 success_ratio;      /* per-cent * 128  */
83         s32 counter;            /* number of frames attempted */
84         s32 average_tpt;        /* success ratio * expected throughput */
85         unsigned long stamp;
86 };
87
88 /**
89  * struct iwl_scale_tbl_info -- tx params and success history for all rates
90  *
91  * There are two of these in struct iwl_lq_sta,
92  * one for "active", and one for "search".
93  */
94 struct iwl_scale_tbl_info {
95         enum iwl_table_type lq_type;
96         u8 ant_type;
97         u8 is_SGI;      /* 1 = short guard interval */
98         u8 is_fat;      /* 1 = 40 MHz channel width */
99         u8 is_dup;      /* 1 = duplicated data streams */
100         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
101         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
102         u32 current_rate;  /* rate_n_flags, uCode API format */
103         struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
104 };
105
106 struct iwl_traffic_load {
107         unsigned long time_stamp;       /* age of the oldest statistics */
108         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
109                                                  * slice */
110         u32 total;                      /* total num of packets during the
111                                          * last TID_MAX_TIME_DIFF */
112         u8 queue_count;                 /* number of queues that has
113                                          * been used since the last cleanup */
114         u8 head;                        /* start of the circular buffer */
115 };
116
117 /**
118  * struct iwl_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 iwl_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 is_green;
140         u8 is_dup;
141         enum ieee80211_band band;
142         u8 ibss_sta_added;
143
144         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
145         u32 supp_rates;
146         u16 active_legacy_rate;
147         u16 active_siso_rate;
148         u16 active_mimo2_rate;
149         u16 active_mimo3_rate;
150         u16 active_rate_basic;
151
152         struct iwl_link_quality_cmd lq;
153         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
154         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
155         u8 tx_agg_tid_en;
156 #ifdef CONFIG_MAC80211_DEBUGFS
157         struct dentry *rs_sta_dbgfs_scale_table_file;
158         struct dentry *rs_sta_dbgfs_stats_table_file;
159         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
160         u32 dbg_fixed_rate;
161 #endif
162         struct iwl_priv *drv;
163
164         /* used to be in sta_info */
165         int last_txrate_idx;
166 };
167
168 static void rs_rate_scale_perform(struct iwl_priv *priv,
169                                    struct ieee80211_hdr *hdr,
170                                    struct ieee80211_sta *sta,
171                                    struct iwl_lq_sta *lq_sta);
172 static void rs_fill_link_cmd(const struct iwl_priv *priv,
173                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
174
175
176 #ifdef CONFIG_MAC80211_DEBUGFS
177 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
178                              u32 *rate_n_flags, int index);
179 #else
180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
181                              u32 *rate_n_flags, int index)
182 {}
183 #endif
184
185 /*
186  * Expected throughput metrics for following rates:
187  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
188  * "G" is the only table that supports CCK (the first 4 rates).
189  */
190 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
192         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
193 };
194
195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
196         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
197 };
198
199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
200         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
201 };
202
203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
204         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
205 };
206
207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
208         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
209 };
210
211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
212         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
213 };
214
215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
216         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
217 };
218
219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
220         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
221 };
222
223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
224         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
225 };
226
227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
228         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
229 };
230
231 static inline u8 rs_extract_rate(u32 rate_n_flags)
232 {
233         return (u8)(rate_n_flags & 0xFF);
234 }
235
236 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
237 {
238         window->data = 0;
239         window->success_counter = 0;
240         window->success_ratio = IWL_INVALID_VALUE;
241         window->counter = 0;
242         window->average_tpt = IWL_INVALID_VALUE;
243         window->stamp = 0;
244 }
245
246 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
247 {
248         return (ant_type & valid_antenna) == ant_type;
249 }
250
251 /*
252  *      removes the old data from the statistics. All data that is older than
253  *      TID_MAX_TIME_DIFF, will be deleted.
254  */
255 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
256 {
257         /* The oldest age we want to keep */
258         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
259
260         while (tl->queue_count &&
261                (tl->time_stamp < oldest_time)) {
262                 tl->total -= tl->packet_count[tl->head];
263                 tl->packet_count[tl->head] = 0;
264                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
265                 tl->queue_count--;
266                 tl->head++;
267                 if (tl->head >= TID_QUEUE_MAX_SIZE)
268                         tl->head = 0;
269         }
270 }
271
272 /*
273  *      increment traffic load value for tid and also remove
274  *      any old values if passed the certain time period
275  */
276 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
277                            struct ieee80211_hdr *hdr)
278 {
279         u32 curr_time = jiffies_to_msecs(jiffies);
280         u32 time_diff;
281         s32 index;
282         struct iwl_traffic_load *tl = NULL;
283         u8 tid;
284
285         if (ieee80211_is_data_qos(hdr->frame_control)) {
286                 u8 *qc = ieee80211_get_qos_ctl(hdr);
287                 tid = qc[0] & 0xf;
288         } else
289                 return MAX_TID_COUNT;
290
291         tl = &lq_data->load[tid];
292
293         curr_time -= curr_time % TID_ROUND_VALUE;
294
295         /* Happens only for the first packet. Initialize the data */
296         if (!(tl->queue_count)) {
297                 tl->total = 1;
298                 tl->time_stamp = curr_time;
299                 tl->queue_count = 1;
300                 tl->head = 0;
301                 tl->packet_count[0] = 1;
302                 return MAX_TID_COUNT;
303         }
304
305         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
306         index = time_diff / TID_QUEUE_CELL_SPACING;
307
308         /* The history is too long: remove data that is older than */
309         /* TID_MAX_TIME_DIFF */
310         if (index >= TID_QUEUE_MAX_SIZE)
311                 rs_tl_rm_old_stats(tl, curr_time);
312
313         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
314         tl->packet_count[index] = tl->packet_count[index] + 1;
315         tl->total = tl->total + 1;
316
317         if ((index + 1) > tl->queue_count)
318                 tl->queue_count = index + 1;
319
320         return tid;
321 }
322
323 /*
324         get the traffic load value for tid
325 */
326 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
327 {
328         u32 curr_time = jiffies_to_msecs(jiffies);
329         u32 time_diff;
330         s32 index;
331         struct iwl_traffic_load *tl = NULL;
332
333         if (tid >= TID_MAX_LOAD_COUNT)
334                 return 0;
335
336         tl = &(lq_data->load[tid]);
337
338         curr_time -= curr_time % TID_ROUND_VALUE;
339
340         if (!(tl->queue_count))
341                 return 0;
342
343         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
344         index = time_diff / TID_QUEUE_CELL_SPACING;
345
346         /* The history is too long: remove data that is older than */
347         /* TID_MAX_TIME_DIFF */
348         if (index >= TID_QUEUE_MAX_SIZE)
349                 rs_tl_rm_old_stats(tl, curr_time);
350
351         return tl->total;
352 }
353
354 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
355                                       struct iwl_lq_sta *lq_data, u8 tid,
356                                       struct ieee80211_sta *sta)
357 {
358         if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
359                 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
360                                 sta->addr, tid);
361                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
362         }
363 }
364
365 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
366                               struct iwl_lq_sta *lq_data,
367                               struct ieee80211_sta *sta)
368 {
369         if ((tid < TID_MAX_LOAD_COUNT))
370                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
371         else if (tid == IWL_AGG_ALL_TID)
372                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
373                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
374 }
375
376 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
377 {
378         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
379                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
380                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
381 }
382
383 /**
384  * rs_collect_tx_data - Update the success/failure sliding window
385  *
386  * We keep a sliding window of the last 62 packets transmitted
387  * at this rate.  window->data contains the bitmask of successful
388  * packets.
389  */
390 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
391                               int scale_index, s32 tpt, int retries,
392                               int successes)
393 {
394         struct iwl_rate_scale_data *window = NULL;
395         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
396         s32 fail_count;
397
398         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
399                 return -EINVAL;
400
401         /* Select data for current tx bit rate */
402         window = &(windows[scale_index]);
403
404         /*
405          * Keep track of only the latest 62 tx frame attempts in this rate's
406          * history window; anything older isn't really relevant any more.
407          * If we have filled up the sliding window, drop the oldest attempt;
408          * if the oldest attempt (highest bit in bitmap) shows "success",
409          * subtract "1" from the success counter (this is the main reason
410          * we keep these bitmaps!).
411          */
412         while (retries > 0) {
413                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
414
415                         /* remove earliest */
416                         window->counter = IWL_RATE_MAX_WINDOW - 1;
417
418                         if (window->data & mask) {
419                                 window->data &= ~mask;
420                                 window->success_counter--;
421                         }
422                 }
423
424                 /* Increment frames-attempted counter */
425                 window->counter++;
426
427                 /* Shift bitmap by one frame (throw away oldest history),
428                  * OR in "1", and increment "success" if this
429                  * frame was successful. */
430                 window->data <<= 1;
431                 if (successes > 0) {
432                         window->success_counter++;
433                         window->data |= 0x1;
434                         successes--;
435                 }
436
437                 retries--;
438         }
439
440         /* Calculate current success ratio, avoid divide-by-0! */
441         if (window->counter > 0)
442                 window->success_ratio = 128 * (100 * window->success_counter)
443                                         / window->counter;
444         else
445                 window->success_ratio = IWL_INVALID_VALUE;
446
447         fail_count = window->counter - window->success_counter;
448
449         /* Calculate average throughput, if we have enough history. */
450         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
451             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
452                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
453         else
454                 window->average_tpt = IWL_INVALID_VALUE;
455
456         /* Tag this window as having been updated */
457         window->stamp = jiffies;
458
459         return 0;
460 }
461
462 /*
463  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
464  */
465 /* FIXME:RS:remove this function and put the flags statically in the table */
466 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
467                                        int index, u8 use_green)
468 {
469         u32 rate_n_flags = 0;
470
471         if (is_legacy(tbl->lq_type)) {
472                 rate_n_flags = iwl_rates[index].plcp;
473                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
474                         rate_n_flags |= RATE_MCS_CCK_MSK;
475
476         } else if (is_Ht(tbl->lq_type)) {
477                 if (index > IWL_LAST_OFDM_RATE) {
478                         printk(KERN_ERR RS_NAME": Invalid HT rate index %d\n",
479                                index);
480                         index = IWL_LAST_OFDM_RATE;
481                 }
482                 rate_n_flags = RATE_MCS_HT_MSK;
483
484                 if (is_siso(tbl->lq_type))
485                         rate_n_flags |= iwl_rates[index].plcp_siso;
486                 else if (is_mimo2(tbl->lq_type))
487                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
488                 else
489                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
490         } else {
491                 printk(KERN_ERR RS_NAME": Invalid tbl->lq_type %d\n",
492                        tbl->lq_type);
493         }
494
495         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
496                                                      RATE_MCS_ANT_ABC_MSK);
497
498         if (is_Ht(tbl->lq_type)) {
499                 if (tbl->is_fat) {
500                         if (tbl->is_dup)
501                                 rate_n_flags |= RATE_MCS_DUP_MSK;
502                         else
503                                 rate_n_flags |= RATE_MCS_FAT_MSK;
504                 }
505                 if (tbl->is_SGI)
506                         rate_n_flags |= RATE_MCS_SGI_MSK;
507
508                 if (use_green) {
509                         rate_n_flags |= RATE_MCS_GF_MSK;
510                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
511                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
512                                 printk(KERN_ERR RS_NAME
513                                        ": GF was set with SGI:SISO\n");
514                         }
515                 }
516         }
517         return rate_n_flags;
518 }
519
520 /*
521  * Interpret uCode API's rate_n_flags format,
522  * fill "search" or "active" tx mode table.
523  */
524 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
525                                     enum ieee80211_band band,
526                                     struct iwl_scale_tbl_info *tbl,
527                                     int *rate_idx)
528 {
529         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
530         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
531         u8 mcs;
532
533         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
534
535         if (*rate_idx  == IWL_RATE_INVALID) {
536                 *rate_idx = -1;
537                 return -EINVAL;
538         }
539         tbl->is_SGI = 0;        /* default legacy setup */
540         tbl->is_fat = 0;
541         tbl->is_dup = 0;
542         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
543         tbl->lq_type = LQ_NONE;
544
545         /* legacy rate format */
546         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
547                 if (num_of_ant == 1) {
548                         if (band == IEEE80211_BAND_5GHZ)
549                                 tbl->lq_type = LQ_A;
550                         else
551                                 tbl->lq_type = LQ_G;
552                 }
553         /* HT rate format */
554         } else {
555                 if (rate_n_flags & RATE_MCS_SGI_MSK)
556                         tbl->is_SGI = 1;
557
558                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
559                     (rate_n_flags & RATE_MCS_DUP_MSK))
560                         tbl->is_fat = 1;
561
562                 if (rate_n_flags & RATE_MCS_DUP_MSK)
563                         tbl->is_dup = 1;
564
565                 mcs = rs_extract_rate(rate_n_flags);
566
567                 /* SISO */
568                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
569                         if (num_of_ant == 1)
570                                 tbl->lq_type = LQ_SISO; /*else NONE*/
571                 /* MIMO2 */
572                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
573                         if (num_of_ant == 2)
574                                 tbl->lq_type = LQ_MIMO2;
575                 /* MIMO3 */
576                 } else {
577                         if (num_of_ant == 3)
578                                 tbl->lq_type = LQ_MIMO3;
579                 }
580         }
581         return 0;
582 }
583
584 /* switch to another antenna/antennas and return 1 */
585 /* if no other valid antenna found, return 0 */
586 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
587                              struct iwl_scale_tbl_info *tbl)
588 {
589         u8 new_ant_type;
590
591         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
592                 return 0;
593
594         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
595                 return 0;
596
597         new_ant_type = ant_toggle_lookup[tbl->ant_type];
598
599         while ((new_ant_type != tbl->ant_type) &&
600                !rs_is_valid_ant(valid_ant, new_ant_type))
601                 new_ant_type = ant_toggle_lookup[new_ant_type];
602
603         if (new_ant_type == tbl->ant_type)
604                 return 0;
605
606         tbl->ant_type = new_ant_type;
607         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
608         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
609         return 1;
610 }
611
612 /* FIXME:RS: in 4965 we don't use greenfield at all */
613 /* FIXME:RS: don't use greenfield for now in TX */
614 #if 0
615 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
616 {
617         return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
618                 priv->current_ht_config.is_green_field &&
619                 !priv->current_ht_config.non_GF_STA_present;
620 }
621 #endif
622 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
623 {
624         return 0;
625 }
626
627 /**
628  * rs_get_supported_rates - get the available rates
629  *
630  * if management frame or broadcast frame only return
631  * basic available rates.
632  *
633  */
634 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
635                                   struct ieee80211_hdr *hdr,
636                                   enum iwl_table_type rate_type)
637 {
638         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
639             lq_sta->active_rate_basic)
640                 return lq_sta->active_rate_basic;
641
642         if (is_legacy(rate_type)) {
643                 return lq_sta->active_legacy_rate;
644         } else {
645                 if (is_siso(rate_type))
646                         return lq_sta->active_siso_rate;
647                 else if (is_mimo2(rate_type))
648                         return lq_sta->active_mimo2_rate;
649                 else
650                         return lq_sta->active_mimo3_rate;
651         }
652 }
653
654 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
655                                 int rate_type)
656 {
657         u8 high = IWL_RATE_INVALID;
658         u8 low = IWL_RATE_INVALID;
659
660         /* 802.11A or ht walks to the next literal adjacent rate in
661          * the rate table */
662         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
663                 int i;
664                 u32 mask;
665
666                 /* Find the previous rate that is in the rate mask */
667                 i = index - 1;
668                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
669                         if (rate_mask & mask) {
670                                 low = i;
671                                 break;
672                         }
673                 }
674
675                 /* Find the next rate that is in the rate mask */
676                 i = index + 1;
677                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
678                         if (rate_mask & mask) {
679                                 high = i;
680                                 break;
681                         }
682                 }
683
684                 return (high << 8) | low;
685         }
686
687         low = index;
688         while (low != IWL_RATE_INVALID) {
689                 low = iwl_rates[low].prev_rs;
690                 if (low == IWL_RATE_INVALID)
691                         break;
692                 if (rate_mask & (1 << low))
693                         break;
694                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
695         }
696
697         high = index;
698         while (high != IWL_RATE_INVALID) {
699                 high = iwl_rates[high].next_rs;
700                 if (high == IWL_RATE_INVALID)
701                         break;
702                 if (rate_mask & (1 << high))
703                         break;
704                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
705         }
706
707         return (high << 8) | low;
708 }
709
710 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
711                              struct iwl_scale_tbl_info *tbl,
712                              u8 scale_index, u8 ht_possible)
713 {
714         s32 low;
715         u16 rate_mask;
716         u16 high_low;
717         u8 switch_to_legacy = 0;
718         u8 is_green = lq_sta->is_green;
719
720         /* check if we need to switch from HT to legacy rates.
721          * assumption is that mandatory rates (1Mbps or 6Mbps)
722          * are always supported (spec demand) */
723         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
724                 switch_to_legacy = 1;
725                 scale_index = rs_ht_to_legacy[scale_index];
726                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
727                         tbl->lq_type = LQ_A;
728                 else
729                         tbl->lq_type = LQ_G;
730
731                 if (num_of_ant(tbl->ant_type) > 1)
732                         tbl->ant_type = ANT_A;/*FIXME:RS*/
733
734                 tbl->is_fat = 0;
735                 tbl->is_SGI = 0;
736         }
737
738         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
739
740         /* Mask with station rate restriction */
741         if (is_legacy(tbl->lq_type)) {
742                 /* supp_rates has no CCK bits in A mode */
743                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
744                         rate_mask  = (u16)(rate_mask &
745                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
746                 else
747                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
748         }
749
750         /* If we switched from HT to legacy, check current rate */
751         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
752                 low = scale_index;
753                 goto out;
754         }
755
756         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
757                                         tbl->lq_type);
758         low = high_low & 0xff;
759
760         if (low == IWL_RATE_INVALID)
761                 low = scale_index;
762
763 out:
764         return rate_n_flags_from_tbl(tbl, low, is_green);
765 }
766
767 /*
768  * mac80211 sends us Tx status
769  */
770 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
771                          struct ieee80211_sta *sta, void *priv_sta,
772                          struct sk_buff *skb)
773 {
774         int status;
775         u8 retries;
776         int rs_index, index = 0;
777         struct iwl_lq_sta *lq_sta = priv_sta;
778         struct iwl_link_quality_cmd *table;
779         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
780         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
781         struct ieee80211_hw *hw = priv->hw;
782         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
783         struct iwl_rate_scale_data *window = NULL;
784         struct iwl_rate_scale_data *search_win = NULL;
785         u32 tx_rate;
786         struct iwl_scale_tbl_info tbl_type;
787         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
788         u8 active_index = 0;
789         s32 tpt = 0;
790
791         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
792
793         if (!ieee80211_is_data(hdr->frame_control) ||
794             is_multicast_ether_addr(hdr->addr1))
795                 return;
796
797         /* This packet was aggregated but doesn't carry rate scale info */
798         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
799             !(info->flags & IEEE80211_TX_STAT_AMPDU))
800                 return;
801
802         retries = info->status.rates[0].count - 1;
803
804         if (retries > 15)
805                 retries = 15;
806
807         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
808             !lq_sta->ibss_sta_added)
809                 goto out;
810
811         table = &lq_sta->lq;
812         active_index = lq_sta->active_tbl;
813
814         curr_tbl = &(lq_sta->lq_info[active_index]);
815         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
816         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
817         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
818
819         /*
820          * Ignore this Tx frame response if its initial rate doesn't match
821          * that of latest Link Quality command.  There may be stragglers
822          * from a previous Link Quality command, but we're no longer interested
823          * in those; they're either from the "active" mode while we're trying
824          * to check "search" mode, or a prior "search" mode after we've moved
825          * to a new "search" mode (which might become the new "active" mode).
826          */
827         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
828         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
829         if (priv->band == IEEE80211_BAND_5GHZ)
830                 rs_index -= IWL_FIRST_OFDM_RATE;
831
832         if ((info->status.rates[0].idx < 0) ||
833             (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
834             (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
835             (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
836             (tbl_type.ant_type != info->antenna_sel_tx) ||
837             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
838             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
839             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
840              hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
841                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
842                 /* the last LQ command could failed so the LQ in ucode not
843                  * the same in driver sync up
844                  */
845                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
846                 goto out;
847         }
848
849         /* Update frame history window with "failure" for each Tx retry. */
850         while (retries) {
851                 /* Look up the rate and other info used for each tx attempt.
852                  * Each tx attempt steps one entry deeper in the rate table. */
853                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
854                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
855                                           &tbl_type, &rs_index);
856
857                 /* If type matches "search" table,
858                  * add failure to "search" history */
859                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
860                     (tbl_type.ant_type == search_tbl->ant_type) &&
861                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
862                         if (search_tbl->expected_tpt)
863                                 tpt = search_tbl->expected_tpt[rs_index];
864                         else
865                                 tpt = 0;
866                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
867
868                 /* Else if type matches "current/active" table,
869                  * add failure to "current/active" history */
870                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
871                            (tbl_type.ant_type == curr_tbl->ant_type) &&
872                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
873                         if (curr_tbl->expected_tpt)
874                                 tpt = curr_tbl->expected_tpt[rs_index];
875                         else
876                                 tpt = 0;
877                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
878                 }
879
880                 /* If not searching for a new mode, increment failed counter
881                  * ... this helps determine when to start searching again */
882                 if (lq_sta->stay_in_tbl)
883                         lq_sta->total_failed++;
884                 --retries;
885                 index++;
886
887         }
888
889         /*
890          * Find (by rate) the history window to update with final Tx attempt;
891          * if Tx was successful first try, use original rate,
892          * else look up the rate that was, finally, successful.
893          */
894         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
895         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
896
897         /* Update frame history window with "success" if Tx got ACKed ... */
898         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
899
900         /* If type matches "search" table,
901          * add final tx status to "search" history */
902         if ((tbl_type.lq_type == search_tbl->lq_type) &&
903             (tbl_type.ant_type == search_tbl->ant_type) &&
904             (tbl_type.is_SGI == search_tbl->is_SGI)) {
905                 if (search_tbl->expected_tpt)
906                         tpt = search_tbl->expected_tpt[rs_index];
907                 else
908                         tpt = 0;
909                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
910                         rs_collect_tx_data(search_win, rs_index, tpt,
911                                            info->status.ampdu_ack_len,
912                                            info->status.ampdu_ack_map);
913                 else
914                         rs_collect_tx_data(search_win, rs_index, tpt,
915                                            1, status);
916         /* Else if type matches "current/active" table,
917          * add final tx status to "current/active" history */
918         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
919                    (tbl_type.ant_type == curr_tbl->ant_type) &&
920                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
921                 if (curr_tbl->expected_tpt)
922                         tpt = curr_tbl->expected_tpt[rs_index];
923                 else
924                         tpt = 0;
925                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
926                         rs_collect_tx_data(window, rs_index, tpt,
927                                            info->status.ampdu_ack_len,
928                                            info->status.ampdu_ack_map);
929                 else
930                         rs_collect_tx_data(window, rs_index, tpt,
931                                            1, status);
932         }
933
934         /* If not searching for new mode, increment success/failed counter
935          * ... these help determine when to start searching again */
936         if (lq_sta->stay_in_tbl) {
937                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
938                         lq_sta->total_success += info->status.ampdu_ack_map;
939                         lq_sta->total_failed +=
940                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
941                 } else {
942                         if (status)
943                                 lq_sta->total_success++;
944                         else
945                                 lq_sta->total_failed++;
946                 }
947         }
948
949         /* See if there's a better rate or modulation mode to try. */
950         if (sta && sta->supp_rates[sband->band])
951                 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
952 out:
953         return;
954 }
955
956 /*
957  * Begin a period of staying with a selected modulation mode.
958  * Set "stay_in_tbl" flag to prevent any mode switches.
959  * Set frame tx success limits according to legacy vs. high-throughput,
960  * and reset overall (spanning all rates) tx success history statistics.
961  * These control how long we stay using same modulation mode before
962  * searching for a new mode.
963  */
964 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
965                                  struct iwl_lq_sta *lq_sta)
966 {
967         IWL_DEBUG_RATE("we are staying in the same table\n");
968         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
969         if (is_legacy) {
970                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
971                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
972                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
973         } else {
974                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
975                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
976                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
977         }
978         lq_sta->table_count = 0;
979         lq_sta->total_failed = 0;
980         lq_sta->total_success = 0;
981 }
982
983 /*
984  * Find correct throughput table for given mode of modulation
985  */
986 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
987                                       struct iwl_scale_tbl_info *tbl)
988 {
989         if (is_legacy(tbl->lq_type)) {
990                 if (!is_a_band(tbl->lq_type))
991                         tbl->expected_tpt = expected_tpt_G;
992                 else
993                         tbl->expected_tpt = expected_tpt_A;
994         } else if (is_siso(tbl->lq_type)) {
995                 if (tbl->is_fat && !lq_sta->is_dup)
996                         if (tbl->is_SGI)
997                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
998                         else
999                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1000                 else if (tbl->is_SGI)
1001                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1002                 else
1003                         tbl->expected_tpt = expected_tpt_siso20MHz;
1004
1005         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1006                 if (tbl->is_fat && !lq_sta->is_dup)
1007                         if (tbl->is_SGI)
1008                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1009                         else
1010                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1011                 else if (tbl->is_SGI)
1012                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1013                 else
1014                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1015         } else
1016                 tbl->expected_tpt = expected_tpt_G;
1017 }
1018
1019 /*
1020  * Find starting rate for new "search" high-throughput mode of modulation.
1021  * Goal is to find lowest expected rate (under perfect conditions) that is
1022  * above the current measured throughput of "active" mode, to give new mode
1023  * a fair chance to prove itself without too many challenges.
1024  *
1025  * This gets called when transitioning to more aggressive modulation
1026  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1027  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1028  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1029  * bit rate will typically need to increase, but not if performance was bad.
1030  */
1031 static s32 rs_get_best_rate(struct iwl_priv *priv,
1032                             struct iwl_lq_sta *lq_sta,
1033                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1034                             u16 rate_mask, s8 index)
1035 {
1036         /* "active" values */
1037         struct iwl_scale_tbl_info *active_tbl =
1038             &(lq_sta->lq_info[lq_sta->active_tbl]);
1039         s32 active_sr = active_tbl->win[index].success_ratio;
1040         s32 active_tpt = active_tbl->expected_tpt[index];
1041
1042         /* expected "search" throughput */
1043         s32 *tpt_tbl = tbl->expected_tpt;
1044
1045         s32 new_rate, high, low, start_hi;
1046         u16 high_low;
1047         s8 rate = index;
1048
1049         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1050
1051         for (; ;) {
1052                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1053                                                 tbl->lq_type);
1054
1055                 low = high_low & 0xff;
1056                 high = (high_low >> 8) & 0xff;
1057
1058                 /*
1059                  * Lower the "search" bit rate, to give new "search" mode
1060                  * approximately the same throughput as "active" if:
1061                  *
1062                  * 1) "Active" mode has been working modestly well (but not
1063                  *    great), and expected "search" throughput (under perfect
1064                  *    conditions) at candidate rate is above the actual
1065                  *    measured "active" throughput (but less than expected
1066                  *    "active" throughput under perfect conditions).
1067                  * OR
1068                  * 2) "Active" mode has been working perfectly or very well
1069                  *    and expected "search" throughput (under perfect
1070                  *    conditions) at candidate rate is above expected
1071                  *    "active" throughput (under perfect conditions).
1072                  */
1073                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1074                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1075                       (active_sr <= IWL_RATE_HIGH_TH) &&
1076                       (tpt_tbl[rate] <= active_tpt))) ||
1077                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1078                      (tpt_tbl[rate] > active_tpt))) {
1079
1080                         /* (2nd or later pass)
1081                          * If we've already tried to raise the rate, and are
1082                          * now trying to lower it, use the higher rate. */
1083                         if (start_hi != IWL_RATE_INVALID) {
1084                                 new_rate = start_hi;
1085                                 break;
1086                         }
1087
1088                         new_rate = rate;
1089
1090                         /* Loop again with lower rate */
1091                         if (low != IWL_RATE_INVALID)
1092                                 rate = low;
1093
1094                         /* Lower rate not available, use the original */
1095                         else
1096                                 break;
1097
1098                 /* Else try to raise the "search" rate to match "active" */
1099                 } else {
1100                         /* (2nd or later pass)
1101                          * If we've already tried to lower the rate, and are
1102                          * now trying to raise it, use the lower rate. */
1103                         if (new_rate != IWL_RATE_INVALID)
1104                                 break;
1105
1106                         /* Loop again with higher rate */
1107                         else if (high != IWL_RATE_INVALID) {
1108                                 start_hi = high;
1109                                 rate = high;
1110
1111                         /* Higher rate not available, use the original */
1112                         } else {
1113                                 new_rate = rate;
1114                                 break;
1115                         }
1116                 }
1117         }
1118
1119         return new_rate;
1120 }
1121
1122 /*
1123  * Set up search table for MIMO
1124  */
1125 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1126                              struct iwl_lq_sta *lq_sta,
1127                              struct ieee80211_conf *conf,
1128                              struct ieee80211_sta *sta,
1129                              struct iwl_scale_tbl_info *tbl, int index)
1130 {
1131         u16 rate_mask;
1132         s32 rate;
1133         s8 is_green = lq_sta->is_green;
1134
1135         if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1136                 return -1;
1137
1138         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1139                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1140                 return -1;
1141
1142         /* Need both Tx chains/antennas to support MIMO */
1143         if (priv->hw_params.tx_chains_num < 2)
1144                 return -1;
1145
1146         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1147
1148         tbl->lq_type = LQ_MIMO2;
1149         tbl->is_dup = lq_sta->is_dup;
1150         tbl->action = 0;
1151         rate_mask = lq_sta->active_mimo2_rate;
1152
1153         if (priv->current_ht_config.supported_chan_width
1154                                         == IWL_CHANNEL_WIDTH_40MHZ)
1155                 tbl->is_fat = 1;
1156         else
1157                 tbl->is_fat = 0;
1158
1159         /* FIXME: - don't toggle SGI here
1160         if (tbl->is_fat) {
1161                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1162                         tbl->is_SGI = 1;
1163                 else
1164                         tbl->is_SGI = 0;
1165         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1166                 tbl->is_SGI = 1;
1167         else
1168                 tbl->is_SGI = 0;
1169         */
1170
1171         rs_set_expected_tpt_table(lq_sta, tbl);
1172
1173         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1174
1175         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1176
1177         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1178                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1179                                                 rate, rate_mask);
1180                 return -1;
1181         }
1182         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1183
1184         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1185                      tbl->current_rate, is_green);
1186         return 0;
1187 }
1188
1189 /*
1190  * Set up search table for SISO
1191  */
1192 static int rs_switch_to_siso(struct iwl_priv *priv,
1193                              struct iwl_lq_sta *lq_sta,
1194                              struct ieee80211_conf *conf,
1195                              struct ieee80211_sta *sta,
1196                              struct iwl_scale_tbl_info *tbl, int index)
1197 {
1198         u16 rate_mask;
1199         u8 is_green = lq_sta->is_green;
1200         s32 rate;
1201
1202         if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1203                 return -1;
1204
1205         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1206
1207         tbl->is_dup = lq_sta->is_dup;
1208         tbl->lq_type = LQ_SISO;
1209         tbl->action = 0;
1210         rate_mask = lq_sta->active_siso_rate;
1211
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         /* FIXME: - don't toggle SGI here
1219         if (tbl->is_fat) {
1220                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1221                         tbl->is_SGI = 1;
1222                 else
1223                         tbl->is_SGI = 0;
1224         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1225                 tbl->is_SGI = 1;
1226         else
1227                 tbl->is_SGI = 0;
1228         */
1229
1230         if (is_green)
1231                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1232
1233         rs_set_expected_tpt_table(lq_sta, tbl);
1234         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1235
1236         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1237         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1238                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1239                              rate, rate_mask);
1240                 return -1;
1241         }
1242         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1243         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1244                      tbl->current_rate, is_green);
1245         return 0;
1246 }
1247
1248 /*
1249  * Try to switch to new modulation mode from legacy
1250  */
1251 static int rs_move_legacy_other(struct iwl_priv *priv,
1252                                 struct iwl_lq_sta *lq_sta,
1253                                 struct ieee80211_conf *conf,
1254                                 struct ieee80211_sta *sta,
1255                                 int index)
1256 {
1257         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1258         struct iwl_scale_tbl_info *search_tbl =
1259                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1260         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1261         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1262                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1263         u8 start_action = tbl->action;
1264         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1265         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1266         int ret = 0;
1267
1268         for (; ;) {
1269                 switch (tbl->action) {
1270                 case IWL_LEGACY_SWITCH_ANTENNA1:
1271                 case IWL_LEGACY_SWITCH_ANTENNA2:
1272                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1273
1274                         lq_sta->action_counter++;
1275
1276                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1277                                                         tx_chains_num <= 1) ||
1278                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1279                                                         tx_chains_num <= 2))
1280                                 break;
1281
1282                         /* Don't change antenna if success has been great */
1283                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1284                                 break;
1285
1286                         /* Set up search table to try other antenna */
1287                         memcpy(search_tbl, tbl, sz);
1288
1289                         if (rs_toggle_antenna(valid_tx_ant,
1290                                 &search_tbl->current_rate, search_tbl)) {
1291                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1292                                 goto out;
1293                         }
1294                         break;
1295                 case IWL_LEGACY_SWITCH_SISO:
1296                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1297
1298                         /* Set up search table to try SISO */
1299                         memcpy(search_tbl, tbl, sz);
1300                         search_tbl->is_SGI = 0;
1301                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1302                                                  search_tbl, index);
1303                         if (!ret) {
1304                                 lq_sta->action_counter = 0;
1305                                 goto out;
1306                         }
1307
1308                         break;
1309                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1310                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1311                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1312                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1313
1314                         /* Set up search table to try MIMO */
1315                         memcpy(search_tbl, tbl, sz);
1316                         search_tbl->is_SGI = 0;
1317
1318                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1319                                 search_tbl->ant_type = ANT_AB;
1320                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1321                                 search_tbl->ant_type = ANT_AC;
1322                         else
1323                                 search_tbl->ant_type = ANT_BC;
1324
1325                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1326                                 break;
1327
1328                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1329                                                  search_tbl, index);
1330                         if (!ret) {
1331                                 lq_sta->action_counter = 0;
1332                                 goto out;
1333                         }
1334                         break;
1335                 }
1336                 tbl->action++;
1337                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1338                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1339
1340                 if (tbl->action == start_action)
1341                         break;
1342
1343         }
1344         search_tbl->lq_type = LQ_NONE;
1345         return 0;
1346
1347 out:
1348         lq_sta->search_better_tbl = 1;
1349         tbl->action++;
1350         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1351                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1352         return 0;
1353
1354 }
1355
1356 /*
1357  * Try to switch to new modulation mode from SISO
1358  */
1359 static int rs_move_siso_to_other(struct iwl_priv *priv,
1360                                  struct iwl_lq_sta *lq_sta,
1361                                  struct ieee80211_conf *conf,
1362                                  struct ieee80211_sta *sta, int index)
1363 {
1364         u8 is_green = lq_sta->is_green;
1365         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1366         struct iwl_scale_tbl_info *search_tbl =
1367                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1368         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1369         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1370                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1371         u8 start_action = tbl->action;
1372         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1373         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1374         int ret;
1375
1376         for (;;) {
1377                 lq_sta->action_counter++;
1378                 switch (tbl->action) {
1379                 case IWL_SISO_SWITCH_ANTENNA1:
1380                 case IWL_SISO_SWITCH_ANTENNA2:
1381                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1382
1383                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1384                                                         tx_chains_num <= 1) ||
1385                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1386                                                         tx_chains_num <= 2))
1387                                 break;
1388
1389                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1390                                 break;
1391
1392                         memcpy(search_tbl, tbl, sz);
1393                         if (rs_toggle_antenna(valid_tx_ant,
1394                                        &search_tbl->current_rate, search_tbl))
1395                                 goto out;
1396                         break;
1397                 case IWL_SISO_SWITCH_MIMO2_AB:
1398                 case IWL_SISO_SWITCH_MIMO2_AC:
1399                 case IWL_SISO_SWITCH_MIMO2_BC:
1400                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1401                         memcpy(search_tbl, tbl, sz);
1402                         search_tbl->is_SGI = 0;
1403
1404                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1405                                 search_tbl->ant_type = ANT_AB;
1406                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1407                                 search_tbl->ant_type = ANT_AC;
1408                         else
1409                                 search_tbl->ant_type = ANT_BC;
1410
1411                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1412                                 break;
1413
1414                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1415                                                  search_tbl, index);
1416                         if (!ret)
1417                                 goto out;
1418                         break;
1419                 case IWL_SISO_SWITCH_GI:
1420                         if (!tbl->is_fat &&
1421                                 !(priv->current_ht_config.sgf &
1422                                                 HT_SHORT_GI_20MHZ))
1423                                 break;
1424                         if (tbl->is_fat &&
1425                                 !(priv->current_ht_config.sgf &
1426                                                 HT_SHORT_GI_40MHZ))
1427                                 break;
1428
1429                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1430
1431                         memcpy(search_tbl, tbl, sz);
1432                         if (is_green) {
1433                                 if (!tbl->is_SGI)
1434                                         break;
1435                                 else
1436                                         IWL_ERROR("SGI was set in GF+SISO\n");
1437                         }
1438                         search_tbl->is_SGI = !tbl->is_SGI;
1439                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1440                         if (tbl->is_SGI) {
1441                                 s32 tpt = lq_sta->last_tpt / 100;
1442                                 if (tpt >= search_tbl->expected_tpt[index])
1443                                         break;
1444                         }
1445                         search_tbl->current_rate = rate_n_flags_from_tbl(
1446                                                 search_tbl, index, is_green);
1447                         goto out;
1448                 }
1449                 tbl->action++;
1450                 if (tbl->action > IWL_SISO_SWITCH_GI)
1451                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1452
1453                 if (tbl->action == start_action)
1454                         break;
1455         }
1456         search_tbl->lq_type = LQ_NONE;
1457         return 0;
1458
1459  out:
1460         lq_sta->search_better_tbl = 1;
1461         tbl->action++;
1462         if (tbl->action > IWL_SISO_SWITCH_GI)
1463                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1464         return 0;
1465 }
1466
1467 /*
1468  * Try to switch to new modulation mode from MIMO
1469  */
1470 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1471                                  struct iwl_lq_sta *lq_sta,
1472                                  struct ieee80211_conf *conf,
1473                                  struct ieee80211_sta *sta, int index)
1474 {
1475         s8 is_green = lq_sta->is_green;
1476         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1477         struct iwl_scale_tbl_info *search_tbl =
1478                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1479         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1480         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1481                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1482         u8 start_action = tbl->action;
1483         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1484         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1485         int ret;
1486
1487         for (;;) {
1488                 lq_sta->action_counter++;
1489                 switch (tbl->action) {
1490                 case IWL_MIMO2_SWITCH_ANTENNA1:
1491                 case IWL_MIMO2_SWITCH_ANTENNA2:
1492                         IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1493
1494                         if (tx_chains_num <= 2)
1495                                 break;
1496
1497                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1498                                 break;
1499
1500                         memcpy(search_tbl, tbl, sz);
1501                         if (rs_toggle_antenna(valid_tx_ant,
1502                                        &search_tbl->current_rate, search_tbl))
1503                                 goto out;
1504                         break;
1505                 case IWL_MIMO2_SWITCH_SISO_A:
1506                 case IWL_MIMO2_SWITCH_SISO_B:
1507                 case IWL_MIMO2_SWITCH_SISO_C:
1508                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1509
1510                         /* Set up new search table for SISO */
1511                         memcpy(search_tbl, tbl, sz);
1512
1513                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1514                                 search_tbl->ant_type = ANT_A;
1515                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1516                                 search_tbl->ant_type = ANT_B;
1517                         else
1518                                 search_tbl->ant_type = ANT_C;
1519
1520                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1521                                 break;
1522
1523                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1524                                                  search_tbl, index);
1525                         if (!ret)
1526                                 goto out;
1527
1528                         break;
1529
1530                 case IWL_MIMO2_SWITCH_GI:
1531                         if (!tbl->is_fat &&
1532                                 !(priv->current_ht_config.sgf &
1533                                                 HT_SHORT_GI_20MHZ))
1534                                 break;
1535                         if (tbl->is_fat &&
1536                                 !(priv->current_ht_config.sgf &
1537                                                 HT_SHORT_GI_40MHZ))
1538                                 break;
1539
1540                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1541
1542                         /* Set up new search table for MIMO */
1543                         memcpy(search_tbl, tbl, sz);
1544                         search_tbl->is_SGI = !tbl->is_SGI;
1545                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1546                         /*
1547                          * If active table already uses the fastest possible
1548                          * modulation (dual stream with short guard interval),
1549                          * and it's working well, there's no need to look
1550                          * for a better type of modulation!
1551                          */
1552                         if (tbl->is_SGI) {
1553                                 s32 tpt = lq_sta->last_tpt / 100;
1554                                 if (tpt >= search_tbl->expected_tpt[index])
1555                                         break;
1556                         }
1557                         search_tbl->current_rate = rate_n_flags_from_tbl(
1558                                                 search_tbl, index, is_green);
1559                         goto out;
1560
1561                 }
1562                 tbl->action++;
1563                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1564                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1565
1566                 if (tbl->action == start_action)
1567                         break;
1568         }
1569         search_tbl->lq_type = LQ_NONE;
1570         return 0;
1571  out:
1572         lq_sta->search_better_tbl = 1;
1573         tbl->action++;
1574         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1575                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1576         return 0;
1577
1578 }
1579
1580 /*
1581  * Check whether we should continue using same modulation mode, or
1582  * begin search for a new mode, based on:
1583  * 1) # tx successes or failures while using this mode
1584  * 2) # times calling this function
1585  * 3) elapsed time in this mode (not used, for now)
1586  */
1587 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1588 {
1589         struct iwl_scale_tbl_info *tbl;
1590         int i;
1591         int active_tbl;
1592         int flush_interval_passed = 0;
1593         struct iwl_priv *priv;
1594
1595         priv = lq_sta->drv;
1596         active_tbl = lq_sta->active_tbl;
1597
1598         tbl = &(lq_sta->lq_info[active_tbl]);
1599
1600         /* If we've been disallowing search, see if we should now allow it */
1601         if (lq_sta->stay_in_tbl) {
1602
1603                 /* Elapsed time using current modulation mode */
1604                 if (lq_sta->flush_timer)
1605                         flush_interval_passed =
1606                             time_after(jiffies,
1607                                        (unsigned long)(lq_sta->flush_timer +
1608                                         IWL_RATE_SCALE_FLUSH_INTVL));
1609
1610                 /*
1611                  * Check if we should allow search for new modulation mode.
1612                  * If many frames have failed or succeeded, or we've used
1613                  * this same modulation for a long time, allow search, and
1614                  * reset history stats that keep track of whether we should
1615                  * allow a new search.  Also (below) reset all bitmaps and
1616                  * stats in active history.
1617                  */
1618                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1619                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1620                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1621                      && (flush_interval_passed))) {
1622                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1623                                      lq_sta->total_failed,
1624                                      lq_sta->total_success,
1625                                      flush_interval_passed);
1626
1627                         /* Allow search for new mode */
1628                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1629                         lq_sta->total_failed = 0;
1630                         lq_sta->total_success = 0;
1631                         lq_sta->flush_timer = 0;
1632
1633                 /*
1634                  * Else if we've used this modulation mode enough repetitions
1635                  * (regardless of elapsed time or success/failure), reset
1636                  * history bitmaps and rate-specific stats for all rates in
1637                  * active table.
1638                  */
1639                 } else {
1640                         lq_sta->table_count++;
1641                         if (lq_sta->table_count >=
1642                             lq_sta->table_count_limit) {
1643                                 lq_sta->table_count = 0;
1644
1645                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1646                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1647                                         rs_rate_scale_clear_window(
1648                                                 &(tbl->win[i]));
1649                         }
1650                 }
1651
1652                 /* If transitioning to allow "search", reset all history
1653                  * bitmaps and stats in active table (this will become the new
1654                  * "search" table). */
1655                 if (!lq_sta->stay_in_tbl) {
1656                         for (i = 0; i < IWL_RATE_COUNT; i++)
1657                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1658                 }
1659         }
1660 }
1661
1662 /*
1663  * Do rate scaling and search for new modulation mode.
1664  */
1665 static void rs_rate_scale_perform(struct iwl_priv *priv,
1666                                   struct ieee80211_hdr *hdr,
1667                                   struct ieee80211_sta *sta,
1668                                   struct iwl_lq_sta *lq_sta)
1669 {
1670         struct ieee80211_hw *hw = priv->hw;
1671         struct ieee80211_conf *conf = &hw->conf;
1672         int low = IWL_RATE_INVALID;
1673         int high = IWL_RATE_INVALID;
1674         int index;
1675         int i;
1676         struct iwl_rate_scale_data *window = NULL;
1677         int current_tpt = IWL_INVALID_VALUE;
1678         int low_tpt = IWL_INVALID_VALUE;
1679         int high_tpt = IWL_INVALID_VALUE;
1680         u32 fail_count;
1681         s8 scale_action = 0;
1682         u16 rate_mask;
1683         u8 update_lq = 0;
1684         struct iwl_scale_tbl_info *tbl, *tbl1;
1685         u16 rate_scale_index_msk = 0;
1686         u32 rate;
1687         u8 is_green = 0;
1688         u8 active_tbl = 0;
1689         u8 done_search = 0;
1690         u16 high_low;
1691         s32 sr;
1692         u8 tid = MAX_TID_COUNT;
1693
1694         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1695
1696         /* Send management frames and broadcast/multicast data using
1697          * lowest rate. */
1698         /* TODO: this could probably be improved.. */
1699         if (!ieee80211_is_data(hdr->frame_control) ||
1700             is_multicast_ether_addr(hdr->addr1))
1701                 return;
1702
1703         if (!sta || !lq_sta)
1704                 return;
1705
1706         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1707
1708         tid = rs_tl_add_packet(lq_sta, hdr);
1709
1710         /*
1711          * Select rate-scale / modulation-mode table to work with in
1712          * the rest of this function:  "search" if searching for better
1713          * modulation mode, or "active" if doing rate scaling within a mode.
1714          */
1715         if (!lq_sta->search_better_tbl)
1716                 active_tbl = lq_sta->active_tbl;
1717         else
1718                 active_tbl = 1 - lq_sta->active_tbl;
1719
1720         tbl = &(lq_sta->lq_info[active_tbl]);
1721         is_green = lq_sta->is_green;
1722
1723         /* current tx rate */
1724         index = lq_sta->last_txrate_idx;
1725
1726         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1727                        tbl->lq_type);
1728
1729         /* rates available for this association, and for modulation mode */
1730         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1731
1732         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1733
1734         /* mask with station rate restriction */
1735         if (is_legacy(tbl->lq_type)) {
1736                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1737                         /* supp_rates has no CCK bits in A mode */
1738                         rate_scale_index_msk = (u16) (rate_mask &
1739                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1740                 else
1741                         rate_scale_index_msk = (u16) (rate_mask &
1742                                                       lq_sta->supp_rates);
1743
1744         } else
1745                 rate_scale_index_msk = rate_mask;
1746
1747         if (!rate_scale_index_msk)
1748                 rate_scale_index_msk = rate_mask;
1749
1750         if (!((1 << index) & rate_scale_index_msk)) {
1751                 IWL_ERROR("Current Rate is not valid\n");
1752                 return;
1753         }
1754
1755         /* Get expected throughput table and history window for current rate */
1756         if (!tbl->expected_tpt) {
1757                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1758                 return;
1759         }
1760
1761         window = &(tbl->win[index]);
1762
1763         /*
1764          * If there is not enough history to calculate actual average
1765          * throughput, keep analyzing results of more tx frames, without
1766          * changing rate or mode (bypass most of the rest of this function).
1767          * Set up new rate table in uCode only if old rate is not supported
1768          * in current association (use new rate found above).
1769          */
1770         fail_count = window->counter - window->success_counter;
1771         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1772                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1773                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1774                                "for index %d\n",
1775                                window->success_counter, window->counter, index);
1776
1777                 /* Can't calculate this yet; not enough history */
1778                 window->average_tpt = IWL_INVALID_VALUE;
1779
1780                 /* Should we stay with this modulation mode,
1781                  * or search for a new one? */
1782                 rs_stay_in_table(lq_sta);
1783
1784                 goto out;
1785         }
1786
1787         /* Else we have enough samples; calculate estimate of
1788          * actual average throughput */
1789
1790         BUG_ON(window->average_tpt != ((window->success_ratio *
1791                         tbl->expected_tpt[index] + 64) / 128));
1792
1793         /* If we are searching for better modulation mode, check success. */
1794         if (lq_sta->search_better_tbl) {
1795
1796                 /* If good success, continue using the "search" mode;
1797                  * no need to send new link quality command, since we're
1798                  * continuing to use the setup that we've been trying. */
1799                 if (window->average_tpt > lq_sta->last_tpt) {
1800
1801                         IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1802                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1803                                         window->success_ratio,
1804                                         window->average_tpt,
1805                                         lq_sta->last_tpt);
1806
1807                         if (!is_legacy(tbl->lq_type))
1808                                 lq_sta->enable_counter = 1;
1809
1810                         /* Swap tables; "search" becomes "active" */
1811                         lq_sta->active_tbl = active_tbl;
1812                         current_tpt = window->average_tpt;
1813
1814                 /* Else poor success; go back to mode in "active" table */
1815                 } else {
1816
1817                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1818                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1819                                         window->success_ratio,
1820                                         window->average_tpt,
1821                                         lq_sta->last_tpt);
1822
1823                         /* Nullify "search" table */
1824                         tbl->lq_type = LQ_NONE;
1825
1826                         /* Revert to "active" table */
1827                         active_tbl = lq_sta->active_tbl;
1828                         tbl = &(lq_sta->lq_info[active_tbl]);
1829
1830                         /* Revert to "active" rate and throughput info */
1831                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1832                         current_tpt = lq_sta->last_tpt;
1833
1834                         /* Need to set up a new rate table in uCode */
1835                         update_lq = 1;
1836                 }
1837
1838                 /* Either way, we've made a decision; modulation mode
1839                  * search is done, allow rate adjustment next time. */
1840                 lq_sta->search_better_tbl = 0;
1841                 done_search = 1;        /* Don't switch modes below! */
1842                 goto lq_update;
1843         }
1844
1845         /* (Else) not in search of better modulation mode, try for better
1846          * starting rate, while staying in this mode. */
1847         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1848                                         tbl->lq_type);
1849         low = high_low & 0xff;
1850         high = (high_low >> 8) & 0xff;
1851
1852         sr = window->success_ratio;
1853
1854         /* Collect measured throughputs for current and adjacent rates */
1855         current_tpt = window->average_tpt;
1856         if (low != IWL_RATE_INVALID)
1857                 low_tpt = tbl->win[low].average_tpt;
1858         if (high != IWL_RATE_INVALID)
1859                 high_tpt = tbl->win[high].average_tpt;
1860
1861         scale_action = 0;
1862
1863         /* Too many failures, decrease rate */
1864         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1865                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1866                 scale_action = -1;
1867
1868         /* No throughput measured yet for adjacent rates; try increase. */
1869         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1870                    (high_tpt == IWL_INVALID_VALUE)) {
1871
1872                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1873                         scale_action = 1;
1874                 else if (low != IWL_RATE_INVALID)
1875                         scale_action = -1;
1876         }
1877
1878         /* Both adjacent throughputs are measured, but neither one has better
1879          * throughput; we're using the best rate, don't change it! */
1880         else if ((low_tpt != IWL_INVALID_VALUE) &&
1881                  (high_tpt != IWL_INVALID_VALUE) &&
1882                  (low_tpt < current_tpt) &&
1883                  (high_tpt < current_tpt))
1884                 scale_action = 0;
1885
1886         /* At least one adjacent rate's throughput is measured,
1887          * and may have better performance. */
1888         else {
1889                 /* Higher adjacent rate's throughput is measured */
1890                 if (high_tpt != IWL_INVALID_VALUE) {
1891                         /* Higher rate has better throughput */
1892                         if (high_tpt > current_tpt &&
1893                                         sr >= IWL_RATE_INCREASE_TH) {
1894                                 scale_action = 1;
1895                         } else {
1896                                 IWL_DEBUG_RATE
1897                                     ("decrease rate because of high tpt\n");
1898                                 scale_action = -1;
1899                         }
1900
1901                 /* Lower adjacent rate's throughput is measured */
1902                 } else if (low_tpt != IWL_INVALID_VALUE) {
1903                         /* Lower rate has better throughput */
1904                         if (low_tpt > current_tpt) {
1905                                 IWL_DEBUG_RATE
1906                                     ("decrease rate because of low tpt\n");
1907                                 scale_action = -1;
1908                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1909                                 scale_action = 1;
1910                         }
1911                 }
1912         }
1913
1914         /* Sanity check; asked for decrease, but success rate or throughput
1915          * has been good at old rate.  Don't change it. */
1916         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1917                     ((sr > IWL_RATE_HIGH_TH) ||
1918                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1919                 scale_action = 0;
1920
1921         switch (scale_action) {
1922         case -1:
1923                 /* Decrease starting rate, update uCode's rate table */
1924                 if (low != IWL_RATE_INVALID) {
1925                         update_lq = 1;
1926                         index = low;
1927                 }
1928                 break;
1929         case 1:
1930                 /* Increase starting rate, update uCode's rate table */
1931                 if (high != IWL_RATE_INVALID) {
1932                         update_lq = 1;
1933                         index = high;
1934                 }
1935
1936                 break;
1937         case 0:
1938                 /* No change */
1939         default:
1940                 break;
1941         }
1942
1943         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1944                     "high %d type %d\n",
1945                      index, scale_action, low, high, tbl->lq_type);
1946
1947 lq_update:
1948         /* Replace uCode's rate table for the destination station. */
1949         if (update_lq) {
1950                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1951                 rs_fill_link_cmd(priv, lq_sta, rate);
1952                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1953         }
1954
1955         /* Should we stay with this modulation mode, or search for a new one? */
1956         rs_stay_in_table(lq_sta);
1957
1958         /*
1959          * Search for new modulation mode if we're:
1960          * 1)  Not changing rates right now
1961          * 2)  Not just finishing up a search
1962          * 3)  Allowing a new search
1963          */
1964         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1965                 /* Save current throughput to compare with "search" throughput*/
1966                 lq_sta->last_tpt = current_tpt;
1967
1968                 /* Select a new "search" modulation mode to try.
1969                  * If one is found, set up the new "search" table. */
1970                 if (is_legacy(tbl->lq_type))
1971                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1972                 else if (is_siso(tbl->lq_type))
1973                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1974                 else
1975                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1976
1977                 /* If new "search" mode was selected, set up in uCode table */
1978                 if (lq_sta->search_better_tbl) {
1979                         /* Access the "search" table, clear its history. */
1980                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1981                         for (i = 0; i < IWL_RATE_COUNT; i++)
1982                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1983
1984                         /* Use new "search" start rate */
1985                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1986
1987                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
1988                                      tbl->current_rate, index);
1989                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1990                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1991                 }
1992
1993                 /* If the "active" (non-search) mode was legacy,
1994                  * and we've tried switching antennas,
1995                  * but we haven't been able to try HT modes (not available),
1996                  * stay with best antenna legacy modulation for a while
1997                  * before next round of mode comparisons. */
1998                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1999                 if (is_legacy(tbl1->lq_type) && !conf->ht.enabled &&
2000                     lq_sta->action_counter >= 1) {
2001                         lq_sta->action_counter = 0;
2002                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2003                         rs_set_stay_in_table(priv, 1, lq_sta);
2004                 }
2005
2006                 /* If we're in an HT mode, and all 3 mode switch actions
2007                  * have been tried and compared, stay in this best modulation
2008                  * mode for a while before next round of mode comparisons. */
2009                 if (lq_sta->enable_counter &&
2010                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2011                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2012                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2013                             (tid != MAX_TID_COUNT)) {
2014                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2015                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2016                         }
2017                         lq_sta->action_counter = 0;
2018                         rs_set_stay_in_table(priv, 0, lq_sta);
2019                 }
2020
2021         /*
2022          * Else, don't search for a new modulation mode.
2023          * Put new timestamp in stay-in-modulation-mode flush timer if:
2024          * 1)  Not changing rates right now
2025          * 2)  Not just finishing up a search
2026          * 3)  flush timer is empty
2027          */
2028         } else {
2029                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2030                         lq_sta->flush_timer = jiffies;
2031         }
2032
2033 out:
2034         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2035         i = index;
2036         lq_sta->last_txrate_idx = i;
2037
2038         return;
2039 }
2040
2041
2042 static void rs_initialize_lq(struct iwl_priv *priv,
2043                              struct ieee80211_conf *conf,
2044                              struct ieee80211_sta *sta,
2045                              struct iwl_lq_sta *lq_sta)
2046 {
2047         struct iwl_scale_tbl_info *tbl;
2048         int rate_idx;
2049         int i;
2050         u32 rate;
2051         u8 use_green = rs_use_green(priv, conf);
2052         u8 active_tbl = 0;
2053         u8 valid_tx_ant;
2054
2055         if (!sta || !lq_sta)
2056                 goto out;
2057
2058         i = lq_sta->last_txrate_idx;
2059
2060         if ((lq_sta->lq.sta_id == 0xff) &&
2061             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2062                 goto out;
2063
2064         valid_tx_ant = priv->hw_params.valid_tx_ant;
2065
2066         if (!lq_sta->search_better_tbl)
2067                 active_tbl = lq_sta->active_tbl;
2068         else
2069                 active_tbl = 1 - lq_sta->active_tbl;
2070
2071         tbl = &(lq_sta->lq_info[active_tbl]);
2072
2073         if ((i < 0) || (i >= IWL_RATE_COUNT))
2074                 i = 0;
2075
2076         rate = iwl_rates[i].plcp;
2077         tbl->ant_type = first_antenna(valid_tx_ant);
2078         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2079
2080         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2081                 rate |= RATE_MCS_CCK_MSK;
2082
2083         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2084         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2085             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2086
2087         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2088         tbl->current_rate = rate;
2089         rs_set_expected_tpt_table(lq_sta, tbl);
2090         rs_fill_link_cmd(NULL, lq_sta, rate);
2091         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2092  out:
2093         return;
2094 }
2095
2096 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2097                         struct ieee80211_tx_rate_control *txrc)
2098 {
2099
2100         struct sk_buff *skb = txrc->skb;
2101         struct ieee80211_supported_band *sband = txrc->sband;
2102         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2103         struct ieee80211_conf *conf = &priv->hw->conf;
2104         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2105         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2106         struct iwl_lq_sta *lq_sta = priv_sta;
2107         int rate_idx;
2108         u64 mask_bit = 0;
2109
2110         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2111
2112         if (sta)
2113                 mask_bit = sta->supp_rates[sband->band];
2114
2115         /* Send management frames and broadcast/multicast data using lowest
2116          * rate. */
2117         if (!ieee80211_is_data(hdr->frame_control) ||
2118             is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) {
2119                 if (!mask_bit)
2120                         info->control.rates[0].idx =
2121                                         rate_lowest_index(sband, NULL);
2122                 else
2123                         info->control.rates[0].idx =
2124                                         rate_lowest_index(sband, sta);
2125                 return;
2126         }
2127
2128         rate_idx  = lq_sta->last_txrate_idx;
2129
2130         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2131             !lq_sta->ibss_sta_added) {
2132                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2133
2134                 if (sta_id == IWL_INVALID_STATION) {
2135                         IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2136                                        hdr->addr1);
2137                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2138                                                         0, CMD_ASYNC, NULL);
2139                 }
2140                 if ((sta_id != IWL_INVALID_STATION)) {
2141                         lq_sta->lq.sta_id = sta_id;
2142                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2143                         lq_sta->ibss_sta_added = 1;
2144                         rs_initialize_lq(priv, conf, sta, lq_sta);
2145                 }
2146         }
2147
2148         if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2149                 rate_idx = rate_lowest_index(sband, sta);
2150         else if (sband->band == IEEE80211_BAND_5GHZ)
2151                 rate_idx -= IWL_FIRST_OFDM_RATE;
2152
2153         info->control.rates[0].idx = rate_idx;
2154 }
2155
2156 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2157                           gfp_t gfp)
2158 {
2159         struct iwl_lq_sta *lq_sta;
2160         struct iwl_priv *priv;
2161         int i, j;
2162
2163         priv = (struct iwl_priv *)priv_rate;
2164         IWL_DEBUG_RATE("create station rate scale window\n");
2165
2166         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2167
2168         if (lq_sta == NULL)
2169                 return NULL;
2170         lq_sta->lq.sta_id = 0xff;
2171
2172
2173         for (j = 0; j < LQ_SIZE; j++)
2174                 for (i = 0; i < IWL_RATE_COUNT; i++)
2175                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2176
2177         return lq_sta;
2178 }
2179
2180 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2181                          struct ieee80211_sta *sta, void *priv_sta)
2182 {
2183         int i, j;
2184         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2185         struct ieee80211_conf *conf = &priv->hw->conf;
2186         struct iwl_lq_sta *lq_sta = priv_sta;
2187         u16 mask_bit = 0;
2188
2189         lq_sta->flush_timer = 0;
2190         lq_sta->supp_rates = sta->supp_rates[sband->band];
2191         for (j = 0; j < LQ_SIZE; j++)
2192                 for (i = 0; i < IWL_RATE_COUNT; i++)
2193                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2194
2195         IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2196         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2197          * the lowest or the highest rate.. Could consider using RSSI from
2198          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2199          * after assoc.. */
2200
2201         lq_sta->ibss_sta_added = 0;
2202         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2203                 u8 sta_id = iwl_find_station(priv, sta->addr);
2204
2205                 /* for IBSS the call are from tasklet */
2206                 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2207
2208                 if (sta_id == IWL_INVALID_STATION) {
2209                         IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2210                         sta_id = iwl_add_station_flags(priv, sta->addr,
2211                                                         0, CMD_ASYNC, NULL);
2212                 }
2213                 if ((sta_id != IWL_INVALID_STATION)) {
2214                         lq_sta->lq.sta_id = sta_id;
2215                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2216                 }
2217                 /* FIXME: this is w/a remove it later */
2218                 priv->assoc_station_added = 1;
2219         }
2220
2221         lq_sta->is_dup = 0;
2222         lq_sta->is_green = rs_use_green(priv, conf);
2223         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2224         lq_sta->active_rate_basic = priv->active_rate_basic;
2225         lq_sta->band = priv->band;
2226         /*
2227          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2228          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2229          */
2230         lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2231         lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2232         lq_sta->active_siso_rate &= ~((u16)0x2);
2233         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2234
2235         /* Same here */
2236         lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2237         lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2238         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2239         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2240
2241         lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2242         lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2243         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2244         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2245
2246         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2247                      lq_sta->active_siso_rate,
2248                      lq_sta->active_mimo2_rate,
2249                      lq_sta->active_mimo3_rate);
2250
2251         /* These values will be overridden later */
2252         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2253         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2254
2255         /* as default allow aggregation for all tids */
2256         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2257         lq_sta->drv = priv;
2258
2259         /* Find highest tx rate supported by hardware and destination station */
2260         mask_bit = sta->supp_rates[sband->band] & lq_sta->active_legacy_rate;
2261         lq_sta->last_txrate_idx = 3;
2262         for (i = 0; i < sband->n_bitrates; i++)
2263                 if (mask_bit & BIT(i))
2264                         lq_sta->last_txrate_idx = i;
2265
2266         /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2267         if (sband->band == IEEE80211_BAND_5GHZ)
2268                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2269
2270         rs_initialize_lq(priv, conf, sta, lq_sta);
2271 }
2272
2273 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2274                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2275 {
2276         struct iwl_scale_tbl_info tbl_type;
2277         int index = 0;
2278         int rate_idx;
2279         int repeat_rate = 0;
2280         u8 ant_toggle_cnt = 0;
2281         u8 use_ht_possible = 1;
2282         u8 valid_tx_ant = 0;
2283         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2284
2285         /* Override starting rate (index 0) if needed for debug purposes */
2286         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2287
2288         /* Interpret new_rate (rate_n_flags) */
2289         memset(&tbl_type, 0, sizeof(tbl_type));
2290         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2291                                   &tbl_type, &rate_idx);
2292
2293         /* How many times should we repeat the initial rate? */
2294         if (is_legacy(tbl_type.lq_type)) {
2295                 ant_toggle_cnt = 1;
2296                 repeat_rate = IWL_NUMBER_TRY;
2297         } else {
2298                 repeat_rate = IWL_HT_NUMBER_TRY;
2299         }
2300
2301         lq_cmd->general_params.mimo_delimiter =
2302                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2303
2304         /* Fill 1st table entry (index 0) */
2305         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2306
2307         if (num_of_ant(tbl_type.ant_type) == 1) {
2308                 lq_cmd->general_params.single_stream_ant_msk =
2309                                                 tbl_type.ant_type;
2310         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2311                 lq_cmd->general_params.dual_stream_ant_msk =
2312                                                 tbl_type.ant_type;
2313         } /* otherwise we don't modify the existing value */
2314
2315         index++;
2316         repeat_rate--;
2317
2318         if (priv)
2319                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2320
2321         /* Fill rest of rate table */
2322         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2323                 /* Repeat initial/next rate.
2324                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2325                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2326                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2327                         if (is_legacy(tbl_type.lq_type)) {
2328                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2329                                         ant_toggle_cnt++;
2330                                 else if (priv &&
2331                                          rs_toggle_antenna(valid_tx_ant,
2332                                                         &new_rate, &tbl_type))
2333                                         ant_toggle_cnt = 1;
2334 }
2335
2336                         /* Override next rate if needed for debug purposes */
2337                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2338
2339                         /* Fill next table entry */
2340                         lq_cmd->rs_table[index].rate_n_flags =
2341                                         cpu_to_le32(new_rate);
2342                         repeat_rate--;
2343                         index++;
2344                 }
2345
2346                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2347                                                 &rate_idx);
2348
2349                 /* Indicate to uCode which entries might be MIMO.
2350                  * If initial rate was MIMO, this will finally end up
2351                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2352                 if (is_mimo(tbl_type.lq_type))
2353                         lq_cmd->general_params.mimo_delimiter = index;
2354
2355                 /* Get next rate */
2356                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2357                                              use_ht_possible);
2358
2359                 /* How many times should we repeat the next rate? */
2360                 if (is_legacy(tbl_type.lq_type)) {
2361                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2362                                 ant_toggle_cnt++;
2363                         else if (priv &&
2364                                  rs_toggle_antenna(valid_tx_ant,
2365                                                    &new_rate, &tbl_type))
2366                                 ant_toggle_cnt = 1;
2367
2368                         repeat_rate = IWL_NUMBER_TRY;
2369                 } else {
2370                         repeat_rate = IWL_HT_NUMBER_TRY;
2371                 }
2372
2373                 /* Don't allow HT rates after next pass.
2374                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2375                 use_ht_possible = 0;
2376
2377                 /* Override next rate if needed for debug purposes */
2378                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2379
2380                 /* Fill next table entry */
2381                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2382
2383                 index++;
2384                 repeat_rate--;
2385         }
2386
2387         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2388         lq_cmd->agg_params.agg_dis_start_th = 3;
2389         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2390 }
2391
2392 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2393 {
2394         return hw->priv;
2395 }
2396 /* rate scale requires free function to be implemented */
2397 static void rs_free(void *priv_rate)
2398 {
2399         return;
2400 }
2401
2402 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2403                         void *priv_sta)
2404 {
2405         struct iwl_lq_sta *lq_sta = priv_sta;
2406         struct iwl_priv *priv __maybe_unused = priv_r;
2407
2408         IWL_DEBUG_RATE("enter\n");
2409         kfree(lq_sta);
2410         IWL_DEBUG_RATE("leave\n");
2411 }
2412
2413
2414 #ifdef CONFIG_MAC80211_DEBUGFS
2415 static int open_file_generic(struct inode *inode, struct file *file)
2416 {
2417         file->private_data = inode->i_private;
2418         return 0;
2419 }
2420 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2421                              u32 *rate_n_flags, int index)
2422 {
2423         struct iwl_priv *priv;
2424
2425         priv = lq_sta->drv;
2426         if (lq_sta->dbg_fixed_rate) {
2427                 if (index < 12) {
2428                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2429                 } else {
2430                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2431                                 *rate_n_flags = 0x800D;
2432                         else
2433                                 *rate_n_flags = 0x820A;
2434                 }
2435                 IWL_DEBUG_RATE("Fixed rate ON\n");
2436         } else {
2437                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2438         }
2439 }
2440
2441 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2442                         const char __user *user_buf, size_t count, loff_t *ppos)
2443 {
2444         struct iwl_lq_sta *lq_sta = file->private_data;
2445         struct iwl_priv *priv;
2446         char buf[64];
2447         int buf_size;
2448         u32 parsed_rate;
2449
2450         priv = lq_sta->drv;
2451         memset(buf, 0, sizeof(buf));
2452         buf_size = min(count, sizeof(buf) -  1);
2453         if (copy_from_user(buf, user_buf, buf_size))
2454                 return -EFAULT;
2455
2456         if (sscanf(buf, "%x", &parsed_rate) == 1)
2457                 lq_sta->dbg_fixed_rate = parsed_rate;
2458         else
2459                 lq_sta->dbg_fixed_rate = 0;
2460
2461         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2462         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2463         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2464         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2465
2466         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2467                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2468
2469         if (lq_sta->dbg_fixed_rate) {
2470                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2471                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2472         }
2473
2474         return count;
2475 }
2476
2477 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2478                         char __user *user_buf, size_t count, loff_t *ppos)
2479 {
2480         char buff[1024];
2481         int desc = 0;
2482         int i = 0;
2483
2484         struct iwl_lq_sta *lq_sta = file->private_data;
2485
2486         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2487         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2488                         lq_sta->total_failed, lq_sta->total_success,
2489                         lq_sta->active_legacy_rate);
2490         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2491                         lq_sta->dbg_fixed_rate);
2492         desc += sprintf(buff+desc, "general:"
2493                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2494                 lq_sta->lq.general_params.flags,
2495                 lq_sta->lq.general_params.mimo_delimiter,
2496                 lq_sta->lq.general_params.single_stream_ant_msk,
2497                 lq_sta->lq.general_params.dual_stream_ant_msk);
2498
2499         desc += sprintf(buff+desc, "agg:"
2500                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2501                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2502                         lq_sta->lq.agg_params.agg_dis_start_th,
2503                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2504
2505         desc += sprintf(buff+desc,
2506                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2507                         lq_sta->lq.general_params.start_rate_index[0],
2508                         lq_sta->lq.general_params.start_rate_index[1],
2509                         lq_sta->lq.general_params.start_rate_index[2],
2510                         lq_sta->lq.general_params.start_rate_index[3]);
2511
2512
2513         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2514                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2515                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2516
2517         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2518 }
2519
2520 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2521         .write = rs_sta_dbgfs_scale_table_write,
2522         .read = rs_sta_dbgfs_scale_table_read,
2523         .open = open_file_generic,
2524 };
2525 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2526                         char __user *user_buf, size_t count, loff_t *ppos)
2527 {
2528         char buff[1024];
2529         int desc = 0;
2530         int i, j;
2531
2532         struct iwl_lq_sta *lq_sta = file->private_data;
2533         for (i = 0; i < LQ_SIZE; i++) {
2534                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2535                                 "rate=0x%X\n",
2536                                 lq_sta->active_tbl == i ? "*" : "x",
2537                                 lq_sta->lq_info[i].lq_type,
2538                                 lq_sta->lq_info[i].is_SGI,
2539                                 lq_sta->lq_info[i].is_fat,
2540                                 lq_sta->lq_info[i].is_dup,
2541                                 lq_sta->lq_info[i].current_rate);
2542                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2543                         desc += sprintf(buff+desc,
2544                                 "counter=%d success=%d %%=%d\n",
2545                                 lq_sta->lq_info[i].win[j].counter,
2546                                 lq_sta->lq_info[i].win[j].success_counter,
2547                                 lq_sta->lq_info[i].win[j].success_ratio);
2548                 }
2549         }
2550         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2551 }
2552
2553 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2554         .read = rs_sta_dbgfs_stats_table_read,
2555         .open = open_file_generic,
2556 };
2557
2558 static void rs_add_debugfs(void *priv, void *priv_sta,
2559                                         struct dentry *dir)
2560 {
2561         struct iwl_lq_sta *lq_sta = priv_sta;
2562         lq_sta->rs_sta_dbgfs_scale_table_file =
2563                 debugfs_create_file("rate_scale_table", 0600, dir,
2564                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2565         lq_sta->rs_sta_dbgfs_stats_table_file =
2566                 debugfs_create_file("rate_stats_table", 0600, dir,
2567                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2568         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2569                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2570                 &lq_sta->tx_agg_tid_en);
2571
2572 }
2573
2574 static void rs_remove_debugfs(void *priv, void *priv_sta)
2575 {
2576         struct iwl_lq_sta *lq_sta = priv_sta;
2577         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2578         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2579         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2580 }
2581 #endif
2582
2583 static struct rate_control_ops rs_ops = {
2584         .module = NULL,
2585         .name = RS_NAME,
2586         .tx_status = rs_tx_status,
2587         .get_rate = rs_get_rate,
2588         .rate_init = rs_rate_init,
2589         .alloc = rs_alloc,
2590         .free = rs_free,
2591         .alloc_sta = rs_alloc_sta,
2592         .free_sta = rs_free_sta,
2593 #ifdef CONFIG_MAC80211_DEBUGFS
2594         .add_sta_debugfs = rs_add_debugfs,
2595         .remove_sta_debugfs = rs_remove_debugfs,
2596 #endif
2597 };
2598
2599 int iwlagn_rate_control_register(void)
2600 {
2601         return ieee80211_rate_control_register(&rs_ops);
2602 }
2603
2604 void iwlagn_rate_control_unregister(void)
2605 {
2606         ieee80211_rate_control_unregister(&rs_ops);
2607 }
2608