iwl4965: add comments to rate scaling code
[linux-2.6.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of version 2 of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
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15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17  *
18  * The full GNU General Public License is included in this distribution in the
19  * file called LICENSE.
20  *
21  * Contact Information:
22  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
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24  *
25  *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
31 #include <net/ieee80211.h>
32
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
36
37 #include <linux/workqueue.h>
38
39 #include "../net/mac80211/ieee80211_rate.h"
40
41 #include "iwl-4965.h"
42 #include "iwl-helpers.h"
43
44 #define RS_NAME "iwl-4965-rs"
45
46 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
47 #define IWL_NUMBER_TRY      1
48 #define IWL_HT_NUMBER_TRY   3
49
50 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
53
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
56
57 static u8 rs_ht_to_legacy[] = {
58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60         IWL_RATE_6M_INDEX,
61         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65 };
66
67 struct iwl4965_rate {
68         u32 rate_n_flags;
69 } __attribute__ ((packed));
70
71 /**
72  * struct iwl4965_rate_scale_data -- tx success history for one rate
73  */
74 struct iwl4965_rate_scale_data {
75         u64 data;               /* bitmap of successful frames */
76         s32 success_counter;    /* number of frames successful */
77         s32 success_ratio;      /* per-cent * 128  */
78         s32 counter;            /* number of frames attempted */
79         s32 average_tpt;        /* success ratio * expected throughput */
80         unsigned long stamp;
81 };
82
83 /**
84  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
85  *
86  * There are two of these in struct iwl_rate_scale_priv,
87  * one for "active", and one for "search".
88  */
89 struct iwl4965_scale_tbl_info {
90         enum iwl4965_table_type lq_type;
91         enum iwl4965_antenna_type antenna_type;
92         u8 is_SGI;      /* 1 = short guard interval */
93         u8 is_fat;      /* 1 = 40 MHz channel width */
94         u8 is_dup;      /* 1 = duplicated data streams */
95         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
96         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
97         struct iwl4965_rate current_rate;  /* rate_n_flags, uCode API format */
98         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
99 };
100
101 /**
102  * struct iwl_rate_scale_priv -- driver's rate scaling private structure
103  *
104  * Pointer to this gets passed back and forth between driver and mac80211.
105  */
106 struct iwl4965_rate_scale_priv {
107         u8 active_tbl;          /* index of active table, range 0-1 */
108         u8 enable_counter;      /* indicates HT mode */
109         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
110         u8 search_better_tbl;   /* 1: currently trying alternate mode */
111         s32 last_tpt;
112
113         /* The following determine when to search for a new mode */
114         u32 table_count_limit;
115         u32 max_failure_limit;  /* # failed frames before new search */
116         u32 max_success_limit;  /* # successful frames before new search */
117         u32 table_count;
118         u32 total_failed;       /* total failed frames, any/all rates */
119         u32 total_success;      /* total successful frames, any/all rates */
120         u32 flush_timer;        /* time staying in mode before new search */
121
122         u8 action_counter;      /* # mode-switch actions tried */
123         u8 antenna;
124         u8 valid_antenna;
125         u8 is_green;
126         u8 is_dup;
127         u8 phymode;
128         u8 ibss_sta_added;
129
130         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
131         u32 supp_rates;
132         u16 active_rate;
133         u16 active_siso_rate;
134         u16 active_mimo_rate;
135         u16 active_rate_basic;
136
137         struct iwl4965_link_quality_cmd lq;
138         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
139 #ifdef CONFIG_MAC80211_DEBUGFS
140         struct dentry *rs_sta_dbgfs_scale_table_file;
141         struct dentry *rs_sta_dbgfs_stats_table_file;
142         struct iwl4965_rate dbg_fixed;
143         struct iwl4965_priv *drv;
144 #endif
145 };
146
147 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
148                                    struct net_device *dev,
149                                    struct ieee80211_hdr *hdr,
150                                    struct sta_info *sta);
151 static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
152                              struct iwl4965_rate *tx_mcs,
153                              struct iwl4965_link_quality_cmd *tbl);
154
155
156 #ifdef CONFIG_MAC80211_DEBUGFS
157 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
158                                 struct iwl4965_rate *mcs, int index);
159 #else
160 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
161                                 struct iwl4965_rate *mcs, int index)
162 {}
163 #endif
164
165 /*
166  * Expected throughput metrics for following rates:
167  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
168  * "G" is the only table that supports CCK (the first 4 rates).
169  */
170 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
171         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
172 };
173
174 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
175         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
176 };
177
178 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
179         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
180 };
181
182 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
183         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
184 };
185
186 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
187         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
188 };
189
190 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
191         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
192 };
193
194 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
195         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
196 };
197
198 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
199         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
200 };
201
202 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
203         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
204 };
205
206 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
207         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
208 };
209
210 static int iwl4965_lq_sync_callback(struct iwl4965_priv *priv,
211                                 struct iwl4965_cmd *cmd, struct sk_buff *skb)
212 {
213         /*We didn't cache the SKB; let the caller free it */
214         return 1;
215 }
216
217 static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
218 {
219         return (u8)(rate_n_flags & 0xFF);
220 }
221
222 static int rs_send_lq_cmd(struct iwl4965_priv *priv,
223                           struct iwl4965_link_quality_cmd *lq, u8 flags)
224 {
225 #ifdef CONFIG_IWL4965_DEBUG
226         int i;
227 #endif
228         struct iwl4965_host_cmd cmd = {
229                 .id = REPLY_TX_LINK_QUALITY_CMD,
230                 .len = sizeof(struct iwl4965_link_quality_cmd),
231                 .meta.flags = flags,
232                 .data = lq,
233         };
234
235         if ((lq->sta_id == 0xFF) &&
236             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
237                 return -EINVAL;
238
239         if (lq->sta_id == 0xFF)
240                 lq->sta_id = IWL_AP_ID;
241
242         IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
243         IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
244                        lq->general_params.single_stream_ant_msk,
245                        lq->general_params.dual_stream_ant_msk);
246 #ifdef CONFIG_IWL4965_DEBUG
247         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
248                 IWL_DEBUG_RATE("lq index %d 0x%X\n",
249                                 i, lq->rs_table[i].rate_n_flags);
250 #endif
251
252         if (flags & CMD_ASYNC)
253                 cmd.meta.u.callback = iwl4965_lq_sync_callback;
254
255         if (iwl4965_is_associated(priv) && priv->assoc_station_added &&
256             priv->lq_mngr.lq_ready)
257                 return  iwl4965_send_cmd(priv, &cmd);
258
259         return 0;
260 }
261
262 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
263 {
264         window->data = 0;
265         window->success_counter = 0;
266         window->success_ratio = IWL_INVALID_VALUE;
267         window->counter = 0;
268         window->average_tpt = IWL_INVALID_VALUE;
269         window->stamp = 0;
270 }
271
272 /**
273  * rs_collect_tx_data - Update the success/failure sliding window
274  *
275  * We keep a sliding window of the last 62 packets transmitted
276  * at this rate.  window->data contains the bitmask of successful
277  * packets.
278  */
279 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
280                               int scale_index, s32 tpt, u32 status)
281 {
282         struct iwl4965_rate_scale_data *window = NULL;
283         u64 mask;
284         u8 win_size = IWL_RATE_MAX_WINDOW;
285         s32 fail_count;
286
287         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
288                 return -EINVAL;
289
290         /* Select data for current tx bit rate */
291         window = &(windows[scale_index]);
292
293         /*
294          * Keep track of only the latest 62 tx frame attempts in this rate's
295          * history window; anything older isn't really relevant any more.
296          * If we have filled up the sliding window, drop the oldest attempt;
297          * if the oldest attempt (highest bit in bitmap) shows "success",
298          * subtract "1" from the success counter (this is the main reason
299          * we keep these bitmaps!).
300          */
301         if (window->counter >= win_size) {
302                 window->counter = win_size - 1;
303                 mask = 1;
304                 mask = (mask << (win_size - 1));
305                 if ((window->data & mask)) {
306                         window->data &= ~mask;
307                         window->success_counter = window->success_counter - 1;
308                 }
309         }
310
311         /* Increment frames-attempted counter */
312         window->counter = window->counter + 1;
313
314         /* Shift bitmap by one frame (throw away oldest history),
315          * OR in "1", and increment "success" if this frame was successful. */
316         mask = window->data;
317         window->data = (mask << 1);
318         if (status != 0) {
319                 window->success_counter = window->success_counter + 1;
320                 window->data |= 0x1;
321         }
322
323         /* Calculate current success ratio, avoid divide-by-0! */
324         if (window->counter > 0)
325                 window->success_ratio = 128 * (100 * window->success_counter)
326                                         / window->counter;
327         else
328                 window->success_ratio = IWL_INVALID_VALUE;
329
330         fail_count = window->counter - window->success_counter;
331
332         /* Calculate average throughput, if we have enough history. */
333         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
334             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
335                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
336         else
337                 window->average_tpt = IWL_INVALID_VALUE;
338
339         /* Tag this window as having been updated */
340         window->stamp = jiffies;
341
342         return 0;
343 }
344
345 /*
346  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
347  */
348 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
349                            struct iwl4965_scale_tbl_info *tbl,
350                            int index, u8 use_green)
351 {
352         if (is_legacy(tbl->lq_type)) {
353                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
354                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
355                         mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
356
357         } else if (is_siso(tbl->lq_type)) {
358                 if (index > IWL_LAST_OFDM_RATE)
359                         index = IWL_LAST_OFDM_RATE;
360                  mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
361                                           RATE_MCS_HT_MSK;
362         } else {
363                 if (index > IWL_LAST_OFDM_RATE)
364                         index = IWL_LAST_OFDM_RATE;
365                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
366                                          RATE_MCS_HT_MSK;
367         }
368
369         switch (tbl->antenna_type) {
370         case ANT_BOTH:
371                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
372                 break;
373         case ANT_MAIN:
374                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
375                 break;
376         case ANT_AUX:
377                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
378                 break;
379         case ANT_NONE:
380                 break;
381         }
382
383         if (is_legacy(tbl->lq_type))
384                 return;
385
386         if (tbl->is_fat) {
387                 if (tbl->is_dup)
388                         mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
389                 else
390                         mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
391         }
392         if (tbl->is_SGI)
393                 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
394
395         if (use_green) {
396                 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
397                 if (is_siso(tbl->lq_type))
398                         mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
399         }
400 }
401
402 /*
403  * Interpret uCode API's rate_n_flags format,
404  * fill "search" or "active" tx mode table.
405  */
406 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
407                                     int phymode, struct iwl4965_scale_tbl_info *tbl,
408                                     int *rate_idx)
409 {
410         int index;
411         u32 ant_msk;
412
413         index = iwl4965_rate_index_from_plcp(mcs_rate->rate_n_flags);
414
415         if (index  == IWL_RATE_INVALID) {
416                 *rate_idx = -1;
417                 return -EINVAL;
418         }
419         tbl->is_SGI = 0;        /* default legacy setup */
420         tbl->is_fat = 0;
421         tbl->is_dup = 0;
422         tbl->antenna_type = ANT_BOTH;   /* default MIMO setup */
423
424         /* legacy rate format */
425         if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
426                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
427
428                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
429                         tbl->lq_type = LQ_NONE;
430                 else {
431
432                         if (phymode == MODE_IEEE80211A)
433                                 tbl->lq_type = LQ_A;
434                         else
435                                 tbl->lq_type = LQ_G;
436
437                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
438                                 tbl->antenna_type = ANT_MAIN;
439                         else
440                                 tbl->antenna_type = ANT_AUX;
441                 }
442                 *rate_idx = index;
443
444         /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
445         } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
446                                         <= IWL_RATE_SISO_60M_PLCP) {
447                 tbl->lq_type = LQ_SISO;
448
449                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
450                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
451                         tbl->lq_type = LQ_NONE;
452                 else {
453                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
454                                 tbl->antenna_type = ANT_MAIN;
455                         else
456                                 tbl->antenna_type = ANT_AUX;
457                 }
458                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
459                         tbl->is_SGI = 1;
460
461                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
462                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
463                         tbl->is_fat = 1;
464
465                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
466                         tbl->is_dup = 1;
467
468                 *rate_idx = index;
469
470         /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
471         } else {
472                 tbl->lq_type = LQ_MIMO;
473                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
474                         tbl->is_SGI = 1;
475
476                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
477                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
478                         tbl->is_fat = 1;
479
480                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
481                         tbl->is_dup = 1;
482                 *rate_idx = index;
483         }
484         return 0;
485 }
486
487 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
488                                      struct iwl4965_scale_tbl_info *tbl)
489 {
490         if (tbl->antenna_type == ANT_AUX) {
491                 tbl->antenna_type = ANT_MAIN;
492                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
493                 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
494         } else {
495                 tbl->antenna_type = ANT_AUX;
496                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
497                 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
498         }
499 }
500
501 static inline u8 rs_use_green(struct iwl4965_priv *priv)
502 {
503 #ifdef CONFIG_IWL4965_HT
504         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
505                 return 0;
506
507         return ((priv->current_assoc_ht.is_green_field) &&
508             !(priv->current_assoc_ht.operating_mode & 0x4));
509 #endif  /*CONFIG_IWL4965_HT */
510         return 0;
511 }
512
513 /**
514  * rs_get_supported_rates - get the available rates
515  *
516  * if management frame or broadcast frame only return
517  * basic available rates.
518  *
519  */
520 static void rs_get_supported_rates(struct iwl4965_rate_scale_priv *lq_data,
521                                    struct ieee80211_hdr *hdr,
522                                    enum iwl4965_table_type rate_type,
523                                    u16 *data_rate)
524 {
525         if (is_legacy(rate_type))
526                 *data_rate = lq_data->active_rate;
527         else {
528                 if (is_siso(rate_type))
529                         *data_rate = lq_data->active_siso_rate;
530                 else
531                         *data_rate = lq_data->active_mimo_rate;
532         }
533
534         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
535             lq_data->active_rate_basic)
536                 *data_rate = lq_data->active_rate_basic;
537 }
538
539 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
540 {
541         u8 high = IWL_RATE_INVALID;
542         u8 low = IWL_RATE_INVALID;
543
544         /* 802.11A or ht walks to the next literal adjacent rate in
545          * the rate table */
546         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
547                 int i;
548                 u32 mask;
549
550                 /* Find the previous rate that is in the rate mask */
551                 i = index - 1;
552                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
553                         if (rate_mask & mask) {
554                                 low = i;
555                                 break;
556                         }
557                 }
558
559                 /* Find the next rate that is in the rate mask */
560                 i = index + 1;
561                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
562                         if (rate_mask & mask) {
563                                 high = i;
564                                 break;
565                         }
566                 }
567
568                 return (high << 8) | low;
569         }
570
571         low = index;
572         while (low != IWL_RATE_INVALID) {
573                 low = iwl4965_rates[low].prev_rs;
574                 if (low == IWL_RATE_INVALID)
575                         break;
576                 if (rate_mask & (1 << low))
577                         break;
578                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
579         }
580
581         high = index;
582         while (high != IWL_RATE_INVALID) {
583                 high = iwl4965_rates[high].next_rs;
584                 if (high == IWL_RATE_INVALID)
585                         break;
586                 if (rate_mask & (1 << high))
587                         break;
588                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
589         }
590
591         return (high << 8) | low;
592 }
593
594 static void rs_get_lower_rate(struct iwl4965_rate_scale_priv *lq_data,
595                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
596                              u8 ht_possible, struct iwl4965_rate *mcs_rate)
597 {
598         s32 low;
599         u16 rate_mask;
600         u16 high_low;
601         u8 switch_to_legacy = 0;
602         u8 is_green = lq_data->is_green;
603
604         /* check if we need to switch from HT to legacy rates.
605          * assumption is that mandatory rates (1Mbps or 6Mbps)
606          * are always supported (spec demand) */
607         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
608                 switch_to_legacy = 1;
609                 scale_index = rs_ht_to_legacy[scale_index];
610                 if (lq_data->phymode == MODE_IEEE80211A)
611                         tbl->lq_type = LQ_A;
612                 else
613                         tbl->lq_type = LQ_G;
614
615                 if ((tbl->antenna_type == ANT_BOTH) ||
616                     (tbl->antenna_type == ANT_NONE))
617                         tbl->antenna_type = ANT_MAIN;
618
619                 tbl->is_fat = 0;
620                 tbl->is_SGI = 0;
621         }
622
623         rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
624
625         /* Mask with station rate restriction */
626         if (is_legacy(tbl->lq_type)) {
627                 /* supp_rates has no CCK bits in A mode */
628                 if (lq_data->phymode == (u8) MODE_IEEE80211A)
629                         rate_mask  = (u16)(rate_mask &
630                            (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
631                 else
632                         rate_mask = (u16)(rate_mask & lq_data->supp_rates);
633         }
634
635         /* If we switched from HT to legacy, check current rate */
636         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
637                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
638                 return;
639         }
640
641         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
642         low = high_low & 0xff;
643
644         if (low != IWL_RATE_INVALID)
645                 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
646         else
647                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
648 }
649
650 /*
651  * mac80211 sends us Tx status
652  */
653 static void rs_tx_status(void *priv_rate,
654                          struct net_device *dev,
655                          struct sk_buff *skb,
656                          struct ieee80211_tx_status *tx_resp)
657 {
658         int status;
659         u8 retries;
660         int rs_index, index = 0;
661         struct iwl4965_rate_scale_priv *lq;
662         struct iwl4965_link_quality_cmd *table;
663         struct sta_info *sta;
664         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
665         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
666         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
667         struct iwl4965_rate_scale_data *window = NULL;
668         struct iwl4965_rate_scale_data *search_win = NULL;
669         struct iwl4965_rate tx_mcs;
670         struct iwl4965_scale_tbl_info tbl_type;
671         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
672         u8 active_index = 0;
673         u16 fc = le16_to_cpu(hdr->frame_control);
674         s32 tpt = 0;
675
676         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
677
678         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
679                 return;
680
681         retries = tx_resp->retry_count;
682
683         if (retries > 15)
684                 retries = 15;
685
686
687         sta = sta_info_get(local, hdr->addr1);
688
689         if (!sta || !sta->rate_ctrl_priv) {
690                 if (sta)
691                         sta_info_put(sta);
692                 return;
693         }
694
695         lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
696
697         if (!priv->lq_mngr.lq_ready)
698                 return;
699
700         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
701                 return;
702
703         table = &lq->lq;
704         active_index = lq->active_tbl;
705
706         /* Get mac80211 antenna info */
707         lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
708         if (!lq->antenna)
709                 lq->antenna = lq->valid_antenna;
710
711         /* Ignore mac80211 antenna info for now */
712         lq->antenna = lq->valid_antenna;
713
714         curr_tbl = &(lq->lq_info[active_index]);
715         search_tbl = &(lq->lq_info[(1 - active_index)]);
716         window = (struct iwl4965_rate_scale_data *)
717             &(curr_tbl->win[0]);
718         search_win = (struct iwl4965_rate_scale_data *)
719             &(search_tbl->win[0]);
720
721         tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
722
723         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
724                                   &tbl_type, &rs_index);
725         if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
726                 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
727                              rs_index, tx_mcs.rate_n_flags);
728                 sta_info_put(sta);
729                 return;
730         }
731
732         /*
733          * Ignore this Tx frame response if its initial rate doesn't match
734          * that of latest Link Quality command.  There may be stragglers
735          * from a previous Link Quality command, but we're no longer interested
736          * in those; they're either from the "active" mode while we're trying
737          * to check "search" mode, or a prior "search" mode after we've moved
738          * to a new "search" mode (which might become the new "active" mode).
739          */
740         if (retries &&
741             (tx_mcs.rate_n_flags !=
742                                 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
743                 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
744                                 tx_mcs.rate_n_flags,
745                                 le32_to_cpu(table->rs_table[0].rate_n_flags));
746                 sta_info_put(sta);
747                 return;
748         }
749
750         /* Update frame history window with "failure" for each Tx retry. */
751         while (retries) {
752                 /* Look up the rate and other info used for each tx attempt.
753                  * Each tx attempt steps one entry deeper in the rate table. */
754                 tx_mcs.rate_n_flags =
755                     le32_to_cpu(table->rs_table[index].rate_n_flags);
756                 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
757                                           &tbl_type, &rs_index);
758
759                 /* If type matches "search" table,
760                  * add failure to "search" history */
761                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
762                     (tbl_type.antenna_type == search_tbl->antenna_type) &&
763                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
764                         if (search_tbl->expected_tpt)
765                                 tpt = search_tbl->expected_tpt[rs_index];
766                         else
767                                 tpt = 0;
768                         rs_collect_tx_data(search_win, rs_index, tpt, 0);
769
770                 /* Else if type matches "current/active" table,
771                  * add failure to "current/active" history */
772                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
773                            (tbl_type.antenna_type == curr_tbl->antenna_type) &&
774                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
775                         if (curr_tbl->expected_tpt)
776                                 tpt = curr_tbl->expected_tpt[rs_index];
777                         else
778                                 tpt = 0;
779                         rs_collect_tx_data(window, rs_index, tpt, 0);
780                 }
781
782                 /* If not searching for a new mode, increment failed counter
783                  * ... this helps determine when to start searching again */
784                 if (lq->stay_in_tbl)
785                         lq->total_failed++;
786                 --retries;
787                 index++;
788
789         }
790
791         /*
792          * Find (by rate) the history window to update with final Tx attempt;
793          * if Tx was successful first try, use original rate,
794          * else look up the rate that was, finally, successful.
795          */
796         if (!tx_resp->retry_count)
797                 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
798         else
799                 tx_mcs.rate_n_flags =
800                         le32_to_cpu(table->rs_table[index].rate_n_flags);
801
802         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
803                                   &tbl_type, &rs_index);
804
805         /* Update frame history window with "success" if Tx got ACKed ... */
806         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
807                 status = 1;
808         else
809                 status = 0;
810
811         /* If type matches "search" table,
812          * add final tx status to "search" history */
813         if ((tbl_type.lq_type == search_tbl->lq_type) &&
814             (tbl_type.antenna_type == search_tbl->antenna_type) &&
815             (tbl_type.is_SGI == search_tbl->is_SGI)) {
816                 if (search_tbl->expected_tpt)
817                         tpt = search_tbl->expected_tpt[rs_index];
818                 else
819                         tpt = 0;
820                 rs_collect_tx_data(search_win,
821                                     rs_index, tpt, status);
822
823         /* Else if type matches "current/active" table,
824          * add final tx status to "current/active" history */
825         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
826                    (tbl_type.antenna_type == curr_tbl->antenna_type) &&
827                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
828                 if (curr_tbl->expected_tpt)
829                         tpt = curr_tbl->expected_tpt[rs_index];
830                 else
831                         tpt = 0;
832                 rs_collect_tx_data(window, rs_index, tpt, status);
833         }
834
835         /* If not searching for new mode, increment success/failed counter
836          * ... these help determine when to start searching again */
837         if (lq->stay_in_tbl) {
838                 if (status)
839                         lq->total_success++;
840                 else
841                         lq->total_failed++;
842         }
843
844         /* See if there's a better rate or modulation mode to try. */
845         rs_rate_scale_perform(priv, dev, hdr, sta);
846         sta_info_put(sta);
847         return;
848 }
849
850 static u8 rs_is_ant_connected(u8 valid_antenna,
851                               enum iwl4965_antenna_type antenna_type)
852 {
853         if (antenna_type == ANT_AUX)
854                 return ((valid_antenna & 0x2) ? 1:0);
855         else if (antenna_type == ANT_MAIN)
856                 return ((valid_antenna & 0x1) ? 1:0);
857         else if (antenna_type == ANT_BOTH)
858                 return ((valid_antenna & 0x3) == 0x3);
859
860         return 1;
861 }
862
863 static u8 rs_is_other_ant_connected(u8 valid_antenna,
864                                     enum iwl4965_antenna_type antenna_type)
865 {
866         if (antenna_type == ANT_AUX)
867                 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
868         else
869                 return rs_is_ant_connected(valid_antenna, ANT_AUX);
870
871         return 0;
872 }
873
874 /*
875  * Begin a period of staying with a selected modulation mode.
876  * Set "stay_in_tbl" flag to prevent any mode switches.
877  * Set frame tx success limits according to legacy vs. high-throughput,
878  * and reset overall (spanning all rates) tx success history statistics.
879  * These control how long we stay using same modulation mode before
880  * searching for a new mode.
881  */
882 static void rs_set_stay_in_table(u8 is_legacy,
883                                  struct iwl4965_rate_scale_priv *lq_data)
884 {
885         IWL_DEBUG_HT("we are staying in the same table\n");
886         lq_data->stay_in_tbl = 1;       /* only place this gets set */
887         if (is_legacy) {
888                 lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
889                 lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
890                 lq_data->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
891         } else {
892                 lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
893                 lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
894                 lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
895         }
896         lq_data->table_count = 0;
897         lq_data->total_failed = 0;
898         lq_data->total_success = 0;
899 }
900
901 /*
902  * Find correct throughput table for given mode of modulation
903  */
904 static void rs_get_expected_tpt_table(struct iwl4965_rate_scale_priv *lq_data,
905                                       struct iwl4965_scale_tbl_info *tbl)
906 {
907         if (is_legacy(tbl->lq_type)) {
908                 if (!is_a_band(tbl->lq_type))
909                         tbl->expected_tpt = expected_tpt_G;
910                 else
911                         tbl->expected_tpt = expected_tpt_A;
912         } else if (is_siso(tbl->lq_type)) {
913                 if (tbl->is_fat && !lq_data->is_dup)
914                         if (tbl->is_SGI)
915                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
916                         else
917                                 tbl->expected_tpt = expected_tpt_siso40MHz;
918                 else if (tbl->is_SGI)
919                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
920                 else
921                         tbl->expected_tpt = expected_tpt_siso20MHz;
922
923         } else if (is_mimo(tbl->lq_type)) {
924                 if (tbl->is_fat && !lq_data->is_dup)
925                         if (tbl->is_SGI)
926                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
927                         else
928                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
929                 else if (tbl->is_SGI)
930                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
931                 else
932                         tbl->expected_tpt = expected_tpt_mimo20MHz;
933         } else
934                 tbl->expected_tpt = expected_tpt_G;
935 }
936
937 #ifdef CONFIG_IWL4965_HT
938 /*
939  * Find starting rate for new "search" high-throughput mode of modulation.
940  * Goal is to find lowest expected rate (under perfect conditions) that is
941  * above the current measured throughput of "active" mode, to give new mode
942  * a fair chance to prove itself without too many challenges.
943  *
944  * This gets called when transitioning to more aggressive modulation
945  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
946  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
947  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
948  * bit rate will typically need to increase, but not if performance was bad.
949  */
950 static s32 rs_get_best_rate(struct iwl4965_priv *priv,
951                             struct iwl4965_rate_scale_priv *lq_data,
952                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
953                             u16 rate_mask, s8 index, s8 rate)
954 {
955         /* "active" values */
956         struct iwl4965_scale_tbl_info *active_tbl =
957             &(lq_data->lq_info[lq_data->active_tbl]);
958         s32 active_sr = active_tbl->win[index].success_ratio;
959         s32 active_tpt = active_tbl->expected_tpt[index];
960
961         /* expected "search" throughput */
962         s32 *tpt_tbl = tbl->expected_tpt;
963
964         s32 new_rate, high, low, start_hi;
965         u16 high_low;
966
967         new_rate = high = low = start_hi = IWL_RATE_INVALID;
968
969         for (; ;) {
970                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
971
972                 low = high_low & 0xff;
973                 high = (high_low >> 8) & 0xff;
974
975                 /*
976                  * Lower the "search" bit rate, to give new "search" mode
977                  * approximately the same throughput as "active" if:
978                  *
979                  * 1) "Active" mode has been working modestly well (but not
980                  *    great), and expected "search" throughput (under perfect
981                  *    conditions) at candidate rate is above the actual
982                  *    measured "active" throughput (but less than expected
983                  *    "active" throughput under perfect conditions).
984                  * OR
985                  * 2) "Active" mode has been working perfectly or very well
986                  *    and expected "search" throughput (under perfect
987                  *    conditions) at candidate rate is above expected
988                  *    "active" throughput (under perfect conditions).
989                  */
990                 if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
991                      ((active_sr > IWL_RATE_DECREASE_TH) &&
992                       (active_sr <= IWL_RATE_HIGH_TH) &&
993                       (tpt_tbl[rate] <= active_tpt))) ||
994                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
995                      (tpt_tbl[rate] > active_tpt))) {
996
997                         /* (2nd or later pass)
998                          * If we've already tried to raise the rate, and are
999                          * now trying to lower it, use the higher rate. */
1000                         if (start_hi != IWL_RATE_INVALID) {
1001                                 new_rate = start_hi;
1002                                 break;
1003                         }
1004
1005                         new_rate = rate;
1006
1007                         /* Loop again with lower rate */
1008                         if (low != IWL_RATE_INVALID)
1009                                 rate = low;
1010
1011                         /* Lower rate not available, use the original */
1012                         else
1013                                 break;
1014
1015                 /* Else try to raise the "search" rate to match "active" */
1016                 } else {
1017                         /* (2nd or later pass)
1018                          * If we've already tried to lower the rate, and are
1019                          * now trying to raise it, use the lower rate. */
1020                         if (new_rate != IWL_RATE_INVALID)
1021                                 break;
1022
1023                         /* Loop again with higher rate */
1024                         else if (high != IWL_RATE_INVALID) {
1025                                 start_hi = high;
1026                                 rate = high;
1027
1028                         /* Higher rate not available, use the original */
1029                         } else {
1030                                 new_rate = rate;
1031                                 break;
1032                         }
1033                 }
1034         }
1035
1036         return new_rate;
1037 }
1038 #endif                          /* CONFIG_IWL4965_HT */
1039
1040 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1041 {
1042         return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1043 }
1044
1045 /*
1046  * Set up search table for MIMO
1047  */
1048 static int rs_switch_to_mimo(struct iwl4965_priv *priv,
1049                              struct iwl4965_rate_scale_priv *lq_data,
1050                              struct iwl4965_scale_tbl_info *tbl, int index)
1051 {
1052 #ifdef CONFIG_IWL4965_HT
1053         u16 rate_mask;
1054         s32 rate;
1055         s8 is_green = lq_data->is_green;
1056
1057         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
1058                 return -1;
1059
1060         IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1061         tbl->lq_type = LQ_MIMO;
1062         rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
1063                                 &rate_mask);
1064
1065         if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1066                 return -1;
1067
1068         /* Need both Tx chains/antennas to support MIMO */
1069         if (!rs_is_both_ant_supp(lq_data->antenna))
1070                 return -1;
1071
1072         tbl->is_dup = lq_data->is_dup;
1073         tbl->action = 0;
1074         if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
1075                 tbl->is_fat = 1;
1076         else
1077                 tbl->is_fat = 0;
1078
1079         if (tbl->is_fat) {
1080                 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
1081                         tbl->is_SGI = 1;
1082                 else
1083                         tbl->is_SGI = 0;
1084         } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
1085                 tbl->is_SGI = 1;
1086         else
1087                 tbl->is_SGI = 0;
1088
1089         rs_get_expected_tpt_table(lq_data, tbl);
1090
1091         rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1092
1093         IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1094         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1095                 return -1;
1096         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1097
1098         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1099                      tbl->current_rate.rate_n_flags, is_green);
1100         return 0;
1101 #else
1102         return -1;
1103 #endif                          /*CONFIG_IWL4965_HT */
1104 }
1105
1106 /*
1107  * Set up search table for SISO
1108  */
1109 static int rs_switch_to_siso(struct iwl4965_priv *priv,
1110                              struct iwl4965_rate_scale_priv *lq_data,
1111                              struct iwl4965_scale_tbl_info *tbl, int index)
1112 {
1113 #ifdef CONFIG_IWL4965_HT
1114         u16 rate_mask;
1115         u8 is_green = lq_data->is_green;
1116         s32 rate;
1117
1118         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1119         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
1120                 return -1;
1121
1122         tbl->is_dup = lq_data->is_dup;
1123         tbl->lq_type = LQ_SISO;
1124         tbl->action = 0;
1125         rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
1126                                 &rate_mask);
1127
1128         if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
1129                 tbl->is_fat = 1;
1130         else
1131                 tbl->is_fat = 0;
1132
1133         if (tbl->is_fat) {
1134                 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
1135                         tbl->is_SGI = 1;
1136                 else
1137                         tbl->is_SGI = 0;
1138         } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
1139                 tbl->is_SGI = 1;
1140         else
1141                 tbl->is_SGI = 0;
1142
1143         if (is_green)
1144                 tbl->is_SGI = 0;
1145
1146         rs_get_expected_tpt_table(lq_data, tbl);
1147         rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1148
1149         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1150         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1151                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1152                              rate, rate_mask);
1153                 return -1;
1154         }
1155         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1156         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1157                      tbl->current_rate.rate_n_flags, is_green);
1158         return 0;
1159 #else
1160         return -1;
1161
1162 #endif                          /*CONFIG_IWL4965_HT */
1163 }
1164
1165 /*
1166  * Try to switch to new modulation mode from legacy
1167  */
1168 static int rs_move_legacy_other(struct iwl4965_priv *priv,
1169                                 struct iwl4965_rate_scale_priv *lq_data,
1170                                 int index)
1171 {
1172         int ret = 0;
1173         struct iwl4965_scale_tbl_info *tbl =
1174             &(lq_data->lq_info[lq_data->active_tbl]);
1175         struct iwl4965_scale_tbl_info *search_tbl =
1176             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1177         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1178         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1179                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1180         u8 start_action = tbl->action;
1181
1182         for (; ;) {
1183                 switch (tbl->action) {
1184                 case IWL_LEGACY_SWITCH_ANTENNA:
1185                         IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1186
1187                         search_tbl->lq_type = LQ_NONE;
1188                         lq_data->action_counter++;
1189
1190                         /* Don't change antenna if success has been great */
1191                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1192                                 break;
1193
1194                         /* Don't change antenna if other one is not connected */
1195                         if (!rs_is_other_ant_connected(lq_data->antenna,
1196                                                         tbl->antenna_type))
1197                                 break;
1198
1199                         /* Set up search table to try other antenna */
1200                         memcpy(search_tbl, tbl, sz);
1201
1202                         rs_toggle_antenna(&(search_tbl->current_rate),
1203                                            search_tbl);
1204                         rs_get_expected_tpt_table(lq_data, search_tbl);
1205                         lq_data->search_better_tbl = 1;
1206                         goto out;
1207
1208                 case IWL_LEGACY_SWITCH_SISO:
1209                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1210
1211                         /* Set up search table to try SISO */
1212                         memcpy(search_tbl, tbl, sz);
1213                         search_tbl->lq_type = LQ_SISO;
1214                         search_tbl->is_SGI = 0;
1215                         search_tbl->is_fat = 0;
1216                         ret = rs_switch_to_siso(priv, lq_data, search_tbl,
1217                                                index);
1218                         if (!ret) {
1219                                 lq_data->search_better_tbl = 1;
1220                                 lq_data->action_counter = 0;
1221                                 goto out;
1222                         }
1223
1224                         break;
1225                 case IWL_LEGACY_SWITCH_MIMO:
1226                         IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1227
1228                         /* Set up search table to try MIMO */
1229                         memcpy(search_tbl, tbl, sz);
1230                         search_tbl->lq_type = LQ_MIMO;
1231                         search_tbl->is_SGI = 0;
1232                         search_tbl->is_fat = 0;
1233                         search_tbl->antenna_type = ANT_BOTH;
1234                         ret = rs_switch_to_mimo(priv, lq_data, search_tbl,
1235                                                index);
1236                         if (!ret) {
1237                                 lq_data->search_better_tbl = 1;
1238                                 lq_data->action_counter = 0;
1239                                 goto out;
1240                         }
1241                         break;
1242                 }
1243                 tbl->action++;
1244                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1245                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1246
1247                 if (tbl->action == start_action)
1248                         break;
1249
1250         }
1251         return 0;
1252
1253  out:
1254         tbl->action++;
1255         if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1256                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1257         return 0;
1258
1259 }
1260
1261 /*
1262  * Try to switch to new modulation mode from SISO
1263  */
1264 static int rs_move_siso_to_other(struct iwl4965_priv *priv,
1265                                  struct iwl4965_rate_scale_priv *lq_data,
1266                                  int index)
1267 {
1268         int ret;
1269         u8 is_green = lq_data->is_green;
1270         struct iwl4965_scale_tbl_info *tbl =
1271             &(lq_data->lq_info[lq_data->active_tbl]);
1272         struct iwl4965_scale_tbl_info *search_tbl =
1273             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1274         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1275         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1276                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1277         u8 start_action = tbl->action;
1278
1279         for (;;) {
1280                 lq_data->action_counter++;
1281                 switch (tbl->action) {
1282                 case IWL_SISO_SWITCH_ANTENNA:
1283                         IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1284                         search_tbl->lq_type = LQ_NONE;
1285                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1286                                 break;
1287                         if (!rs_is_other_ant_connected(lq_data->antenna,
1288                                                        tbl->antenna_type))
1289                                 break;
1290
1291                         memcpy(search_tbl, tbl, sz);
1292                         search_tbl->action = IWL_SISO_SWITCH_MIMO;
1293                         rs_toggle_antenna(&(search_tbl->current_rate),
1294                                            search_tbl);
1295                         lq_data->search_better_tbl = 1;
1296
1297                         goto out;
1298
1299                 case IWL_SISO_SWITCH_MIMO:
1300                         IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1301                         memcpy(search_tbl, tbl, sz);
1302                         search_tbl->lq_type = LQ_MIMO;
1303                         search_tbl->is_SGI = 0;
1304                         search_tbl->is_fat = 0;
1305                         search_tbl->antenna_type = ANT_BOTH;
1306                         ret = rs_switch_to_mimo(priv, lq_data, search_tbl,
1307                                                index);
1308                         if (!ret) {
1309                                 lq_data->search_better_tbl = 1;
1310                                 goto out;
1311                         }
1312                         break;
1313                 case IWL_SISO_SWITCH_GI:
1314                         IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1315                         memcpy(search_tbl, tbl, sz);
1316                         search_tbl->action = 0;
1317                         if (search_tbl->is_SGI)
1318                                 search_tbl->is_SGI = 0;
1319                         else if (!is_green)
1320                                 search_tbl->is_SGI = 1;
1321                         else
1322                                 break;
1323                         lq_data->search_better_tbl = 1;
1324                         if ((tbl->lq_type == LQ_SISO) &&
1325                             (tbl->is_SGI)) {
1326                                 s32 tpt = lq_data->last_tpt / 100;
1327                                 if (((!tbl->is_fat) &&
1328                                      (tpt >= expected_tpt_siso20MHz[index])) ||
1329                                     ((tbl->is_fat) &&
1330                                      (tpt >= expected_tpt_siso40MHz[index])))
1331                                         lq_data->search_better_tbl = 0;
1332                         }
1333                         rs_get_expected_tpt_table(lq_data, search_tbl);
1334                         rs_mcs_from_tbl(&search_tbl->current_rate,
1335                                              search_tbl, index, is_green);
1336                         goto out;
1337                 }
1338                 tbl->action++;
1339                 if (tbl->action > IWL_SISO_SWITCH_GI)
1340                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1341
1342                 if (tbl->action == start_action)
1343                         break;
1344         }
1345         return 0;
1346
1347  out:
1348         tbl->action++;
1349         if (tbl->action > IWL_SISO_SWITCH_GI)
1350                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1351         return 0;
1352 }
1353
1354 /*
1355  * Try to switch to new modulation mode from MIMO
1356  */
1357 static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
1358                                  struct iwl4965_rate_scale_priv *lq_data,
1359                                  int index)
1360 {
1361         int ret;
1362         s8 is_green = lq_data->is_green;
1363         struct iwl4965_scale_tbl_info *tbl =
1364             &(lq_data->lq_info[lq_data->active_tbl]);
1365         struct iwl4965_scale_tbl_info *search_tbl =
1366             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1367         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1368                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1369         u8 start_action = tbl->action;
1370
1371         for (;;) {
1372                 lq_data->action_counter++;
1373                 switch (tbl->action) {
1374                 case IWL_MIMO_SWITCH_ANTENNA_A:
1375                 case IWL_MIMO_SWITCH_ANTENNA_B:
1376                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1377
1378                         /* Set up new search table for SISO */
1379                         memcpy(search_tbl, tbl, sz);
1380                         search_tbl->lq_type = LQ_SISO;
1381                         search_tbl->is_SGI = 0;
1382                         search_tbl->is_fat = 0;
1383                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1384                                 search_tbl->antenna_type = ANT_MAIN;
1385                         else
1386                                 search_tbl->antenna_type = ANT_AUX;
1387
1388                         ret = rs_switch_to_siso(priv, lq_data, search_tbl,
1389                                                index);
1390                         if (!ret) {
1391                                 lq_data->search_better_tbl = 1;
1392                                 goto out;
1393                         }
1394                         break;
1395
1396                 case IWL_MIMO_SWITCH_GI:
1397                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1398
1399                         /* Set up new search table for MIMO */
1400                         memcpy(search_tbl, tbl, sz);
1401                         search_tbl->lq_type = LQ_MIMO;
1402                         search_tbl->antenna_type = ANT_BOTH;
1403                         search_tbl->action = 0;
1404                         if (search_tbl->is_SGI)
1405                                 search_tbl->is_SGI = 0;
1406                         else
1407                                 search_tbl->is_SGI = 1;
1408                         lq_data->search_better_tbl = 1;
1409
1410                         /*
1411                          * If active table already uses the fastest possible
1412                          * modulation (dual stream with short guard interval),
1413                          * and it's working well, there's no need to look
1414                          * for a better type of modulation!
1415                          */
1416                         if ((tbl->lq_type == LQ_MIMO) &&
1417                             (tbl->is_SGI)) {
1418                                 s32 tpt = lq_data->last_tpt / 100;
1419                                 if (((!tbl->is_fat) &&
1420                                      (tpt >= expected_tpt_mimo20MHz[index])) ||
1421                                     ((tbl->is_fat) &&
1422                                      (tpt >= expected_tpt_mimo40MHz[index])))
1423                                         lq_data->search_better_tbl = 0;
1424                         }
1425                         rs_get_expected_tpt_table(lq_data, search_tbl);
1426                         rs_mcs_from_tbl(&search_tbl->current_rate,
1427                                              search_tbl, index, is_green);
1428                         goto out;
1429
1430                 }
1431                 tbl->action++;
1432                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1433                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1434
1435                 if (tbl->action == start_action)
1436                         break;
1437         }
1438
1439         return 0;
1440  out:
1441         tbl->action++;
1442         if (tbl->action > IWL_MIMO_SWITCH_GI)
1443                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1444         return 0;
1445
1446 }
1447
1448 /*
1449  * Check whether we should continue using same modulation mode, or
1450  * begin search for a new mode, based on:
1451  * 1) # tx successes or failures while using this mode
1452  * 2) # times calling this function
1453  * 3) elapsed time in this mode (not used, for now)
1454  */
1455 static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data)
1456 {
1457         struct iwl4965_scale_tbl_info *tbl;
1458         int i;
1459         int active_tbl;
1460         int flush_interval_passed = 0;
1461
1462         active_tbl = lq_data->active_tbl;
1463
1464         tbl = &(lq_data->lq_info[active_tbl]);
1465
1466         /* If we've been disallowing search, see if we should now allow it */
1467         if (lq_data->stay_in_tbl) {
1468
1469                 /* Elapsed time using current modulation mode */
1470                 if (lq_data->flush_timer)
1471                         flush_interval_passed =
1472                             time_after(jiffies,
1473                                        (unsigned long)(lq_data->flush_timer +
1474                                         IWL_RATE_SCALE_FLUSH_INTVL));
1475
1476                 /* For now, disable the elapsed time criterion */
1477                 flush_interval_passed = 0;
1478
1479                 /*
1480                  * Check if we should allow search for new modulation mode.
1481                  * If many frames have failed or succeeded, or we've used
1482                  * this same modulation for a long time, allow search, and
1483                  * reset history stats that keep track of whether we should
1484                  * allow a new search.  Also (below) reset all bitmaps and
1485                  * stats in active history.
1486                  */
1487                 if ((lq_data->total_failed > lq_data->max_failure_limit) ||
1488                     (lq_data->total_success > lq_data->max_success_limit) ||
1489                     ((!lq_data->search_better_tbl) && (lq_data->flush_timer)
1490                      && (flush_interval_passed))) {
1491                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1492                                      lq_data->total_failed,
1493                                      lq_data->total_success,
1494                                      flush_interval_passed);
1495
1496                         /* Allow search for new mode */
1497                         lq_data->stay_in_tbl = 0;       /* only place reset */
1498                         lq_data->total_failed = 0;
1499                         lq_data->total_success = 0;
1500                         lq_data->flush_timer = 0;
1501
1502                 /*
1503                  * Else if we've used this modulation mode enough repetitions
1504                  * (regardless of elapsed time or success/failure), reset
1505                  * history bitmaps and rate-specific stats for all rates in
1506                  * active table.
1507                  */
1508                 } else {
1509                         lq_data->table_count++;
1510                         if (lq_data->table_count >=
1511                             lq_data->table_count_limit) {
1512                                 lq_data->table_count = 0;
1513
1514                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1515                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1516                                         rs_rate_scale_clear_window(
1517                                                 &(tbl->win[i]));
1518                         }
1519                 }
1520
1521                 /* If transitioning to allow "search", reset all history
1522                  * bitmaps and stats in active table (this will become the new
1523                  * "search" table). */
1524                 if (!lq_data->stay_in_tbl) {
1525                         for (i = 0; i < IWL_RATE_COUNT; i++)
1526                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1527                 }
1528         }
1529 }
1530
1531 /*
1532  * Do rate scaling and search for new modulation mode.
1533  */
1534 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
1535                                   struct net_device *dev,
1536                                   struct ieee80211_hdr *hdr,
1537                                   struct sta_info *sta)
1538 {
1539         int low = IWL_RATE_INVALID;
1540         int high = IWL_RATE_INVALID;
1541         int index;
1542         int i;
1543         struct iwl4965_rate_scale_data *window = NULL;
1544         int current_tpt = IWL_INVALID_VALUE;
1545         int low_tpt = IWL_INVALID_VALUE;
1546         int high_tpt = IWL_INVALID_VALUE;
1547         u32 fail_count;
1548         s8 scale_action = 0;
1549         u16 fc, rate_mask;
1550         u8 update_lq = 0;
1551         struct iwl4965_rate_scale_priv *lq_data;
1552         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1553         u16 rate_scale_index_msk = 0;
1554         struct iwl4965_rate mcs_rate;
1555         u8 is_green = 0;
1556         u8 active_tbl = 0;
1557         u8 done_search = 0;
1558         u16 high_low;
1559
1560         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1561
1562         fc = le16_to_cpu(hdr->frame_control);
1563         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1564                 /* Send management frames and broadcast/multicast data using
1565                  * lowest rate. */
1566                 /* TODO: this could probably be improved.. */
1567                 return;
1568         }
1569
1570         if (!sta || !sta->rate_ctrl_priv)
1571                 return;
1572
1573         if (!priv->lq_mngr.lq_ready) {
1574                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1575                 return;
1576         }
1577         lq_data = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
1578
1579         /*
1580          * Select rate-scale / modulation-mode table to work with in
1581          * the rest of this function:  "search" if searching for better
1582          * modulation mode, or "active" if doing rate scaling within a mode.
1583          */
1584         if (!lq_data->search_better_tbl)
1585                 active_tbl = lq_data->active_tbl;
1586         else
1587                 active_tbl = 1 - lq_data->active_tbl;
1588
1589         tbl = &(lq_data->lq_info[active_tbl]);
1590         is_green = lq_data->is_green;
1591
1592         /* current tx rate */
1593         index = sta->last_txrate;
1594
1595         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1596                        tbl->lq_type);
1597
1598         /* rates available for this association, and for modulation mode */
1599         rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
1600                                 &rate_mask);
1601
1602         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1603
1604         /* mask with station rate restriction */
1605         if (is_legacy(tbl->lq_type)) {
1606                 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1607                         /* supp_rates has no CCK bits in A mode */
1608                         rate_scale_index_msk = (u16) (rate_mask &
1609                                 (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
1610                 else
1611                         rate_scale_index_msk = (u16) (rate_mask &
1612                                                       lq_data->supp_rates);
1613
1614         } else
1615                 rate_scale_index_msk = rate_mask;
1616
1617         if (!rate_scale_index_msk)
1618                 rate_scale_index_msk = rate_mask;
1619
1620         /* If current rate is no longer supported on current association,
1621          * or user changed preferences for rates, find a new supported rate. */
1622         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1623                 index = IWL_INVALID_VALUE;
1624                 update_lq = 1;
1625
1626                 /* get the highest available rate */
1627                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1628                         if ((1 << i) & rate_scale_index_msk)
1629                                 index = i;
1630                 }
1631
1632                 if (index == IWL_INVALID_VALUE) {
1633                         IWL_WARNING("Can not find a suitable rate\n");
1634                         return;
1635                 }
1636         }
1637
1638         /* Get expected throughput table and history window for current rate */
1639         if (!tbl->expected_tpt)
1640                 rs_get_expected_tpt_table(lq_data, tbl);
1641
1642         window = &(tbl->win[index]);
1643
1644         /*
1645          * If there is not enough history to calculate actual average
1646          * throughput, keep analyzing results of more tx frames, without
1647          * changing rate or mode (bypass most of the rest of this function).
1648          * Set up new rate table in uCode only if old rate is not supported
1649          * in current association (use new rate found above).
1650          */
1651         fail_count = window->counter - window->success_counter;
1652         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1653              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1654             || (tbl->expected_tpt == NULL)) {
1655                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1656                                "for index %d\n",
1657                                window->success_counter, window->counter, index);
1658
1659                 /* Can't calculate this yet; not enough history */
1660                 window->average_tpt = IWL_INVALID_VALUE;
1661
1662                 /* Should we stay with this modulation mode,
1663                  * or search for a new one? */
1664                 rs_stay_in_table(lq_data);
1665
1666                 /* Set up new rate table in uCode, if needed */
1667                 if (update_lq) {
1668                         rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1669                         rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1670                         rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1671                 }
1672                 goto out;
1673
1674         /* Else we have enough samples; calculate estimate of
1675          * actual average throughput */
1676         } else
1677                 window->average_tpt = ((window->success_ratio *
1678                                         tbl->expected_tpt[index] + 64) / 128);
1679
1680         /* If we are searching for better modulation mode, check success. */
1681         if (lq_data->search_better_tbl) {
1682                 int success_limit = IWL_RATE_SCALE_SWITCH;
1683
1684                 /* If good success, continue using the "search" mode;
1685                  * no need to send new link quality command, since we're
1686                  * continuing to use the setup that we've been trying. */
1687                 if ((window->success_ratio > success_limit) ||
1688                     (window->average_tpt > lq_data->last_tpt)) {
1689                         if (!is_legacy(tbl->lq_type)) {
1690                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1691                                              " rate suc %d current tpt %d"
1692                                              " old tpt %d\n",
1693                                              window->success_ratio,
1694                                              window->average_tpt,
1695                                              lq_data->last_tpt);
1696                                 lq_data->enable_counter = 1;
1697                         }
1698                         /* Swap tables; "search" becomes "active" */
1699                         lq_data->active_tbl = active_tbl;
1700                         current_tpt = window->average_tpt;
1701
1702                 /* Else poor success; go back to mode in "active" table */
1703                 } else {
1704                         /* Nullify "search" table */
1705                         tbl->lq_type = LQ_NONE;
1706
1707                         /* Revert to "active" table */
1708                         active_tbl = lq_data->active_tbl;
1709                         tbl = &(lq_data->lq_info[active_tbl]);
1710
1711                         /* Revert to "active" rate and throughput info */
1712                         index = iwl4965_rate_index_from_plcp(
1713                                 tbl->current_rate.rate_n_flags);
1714                         current_tpt = lq_data->last_tpt;
1715
1716                         /* Need to set up a new rate table in uCode */
1717                         update_lq = 1;
1718                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1719                 }
1720
1721                 /* Either way, we've made a decision; modulation mode
1722                  * search is done, allow rate adjustment next time. */
1723                 lq_data->search_better_tbl = 0;
1724                 done_search = 1;        /* Don't switch modes below! */
1725                 goto lq_update;
1726         }
1727
1728         /* (Else) not in search of better modulation mode, try for better
1729          * starting rate, while staying in this mode. */
1730         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1731                                         tbl->lq_type);
1732         low = high_low & 0xff;
1733         high = (high_low >> 8) & 0xff;
1734
1735         /* Collect measured throughputs for current and adjacent rates */
1736         current_tpt = window->average_tpt;
1737         if (low != IWL_RATE_INVALID)
1738                 low_tpt = tbl->win[low].average_tpt;
1739         if (high != IWL_RATE_INVALID)
1740                 high_tpt = tbl->win[high].average_tpt;
1741
1742         /* Assume rate increase */
1743         scale_action = 1;
1744
1745         /* Too many failures, decrease rate */
1746         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1747             (current_tpt == 0)) {
1748                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1749                 scale_action = -1;
1750
1751         /* No throughput measured yet for adjacent rates; try increase. */
1752         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1753                    (high_tpt == IWL_INVALID_VALUE))
1754                 scale_action = 1;
1755
1756         /* Both adjacent throughputs are measured, but neither one has better
1757          * throughput; we're using the best rate, don't change it! */
1758         else if ((low_tpt != IWL_INVALID_VALUE) &&
1759                  (high_tpt != IWL_INVALID_VALUE) &&
1760                  (low_tpt < current_tpt) &&
1761                  (high_tpt < current_tpt))
1762                 scale_action = 0;
1763
1764         /* At least one adjacent rate's throughput is measured,
1765          * and may have better performance. */
1766         else {
1767                 /* Higher adjacent rate's throughput is measured */
1768                 if (high_tpt != IWL_INVALID_VALUE) {
1769                         /* Higher rate has better throughput */
1770                         if (high_tpt > current_tpt)
1771                                 scale_action = 1;
1772                         else {
1773                                 IWL_DEBUG_RATE
1774                                     ("decrease rate because of high tpt\n");
1775                                 scale_action = -1;
1776                         }
1777
1778                 /* Lower adjacent rate's throughput is measured */
1779                 } else if (low_tpt != IWL_INVALID_VALUE) {
1780                         /* Lower rate has better throughput */
1781                         if (low_tpt > current_tpt) {
1782                                 IWL_DEBUG_RATE
1783                                     ("decrease rate because of low tpt\n");
1784                                 scale_action = -1;
1785                         } else
1786                                 scale_action = 1;
1787                 }
1788         }
1789
1790         /* Sanity check; asked for decrease, but success rate or throughput
1791          * has been good at old rate.  Don't change it. */
1792         if (scale_action == -1) {
1793                 if ((low != IWL_RATE_INVALID) &&
1794                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1795                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1796                         scale_action = 0;
1797
1798         /* Sanity check; asked for increase, but success rate has not been great
1799          * even at old rate, higher rate will be worse.  Don't change it. */
1800         } else if ((scale_action == 1) &&
1801                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1802                 scale_action = 0;
1803
1804         switch (scale_action) {
1805         case -1:
1806                 /* Decrease starting rate, update uCode's rate table */
1807                 if (low != IWL_RATE_INVALID) {
1808                         update_lq = 1;
1809                         index = low;
1810                 }
1811                 break;
1812         case 1:
1813                 /* Increase starting rate, update uCode's rate table */
1814                 if (high != IWL_RATE_INVALID) {
1815                         update_lq = 1;
1816                         index = high;
1817                 }
1818
1819                 break;
1820         case 0:
1821                 /* No change */
1822         default:
1823                 break;
1824         }
1825
1826         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1827                     "high %d type %d\n",
1828                      index, scale_action, low, high, tbl->lq_type);
1829
1830  lq_update:
1831         /* Replace uCode's rate table for the destination station. */
1832         if (update_lq) {
1833                 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1834                 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1835                 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1836         }
1837
1838         /* Should we stay with this modulation mode, or search for a new one? */
1839         rs_stay_in_table(lq_data);
1840
1841         /*
1842          * Search for new modulation mode if we're:
1843          * 1)  Not changing rates right now
1844          * 2)  Not just finishing up a search
1845          * 3)  Allowing a new search
1846          */
1847         if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
1848                 /* Save current throughput to compare with "search" throughput*/
1849                 lq_data->last_tpt = current_tpt;
1850
1851                 /* Select a new "search" modulation mode to try.
1852                  * If one is found, set up the new "search" table. */
1853                 if (is_legacy(tbl->lq_type))
1854                         rs_move_legacy_other(priv, lq_data, index);
1855                 else if (is_siso(tbl->lq_type))
1856                         rs_move_siso_to_other(priv, lq_data, index);
1857                 else
1858                         rs_move_mimo_to_other(priv, lq_data, index);
1859
1860                 /* If new "search" mode was selected, set up in uCode table */
1861                 if (lq_data->search_better_tbl) {
1862                         /* Access the "search" table, clear its history. */
1863                         tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1864                         for (i = 0; i < IWL_RATE_COUNT; i++)
1865                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1866
1867                         /* Use new "search" start rate */
1868                         index = iwl4965_rate_index_from_plcp(
1869                                         tbl->current_rate.rate_n_flags);
1870
1871                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
1872                                      tbl->current_rate.rate_n_flags, index);
1873                         rs_fill_link_cmd(lq_data, &tbl->current_rate,
1874                                          &lq_data->lq);
1875                         rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1876                 }
1877
1878                 /* If the "active" (non-search) mode was legacy,
1879                  * and we've tried switching antennas,
1880                  * but we haven't been able to try HT modes (not available),
1881                  * stay with best antenna legacy modulation for a while
1882                  * before next round of mode comparisons. */
1883                 tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
1884                 if (is_legacy(tbl1->lq_type) &&
1885 #ifdef CONFIG_IWL4965_HT
1886                     !priv->current_assoc_ht.is_ht &&
1887 #endif
1888                     (lq_data->action_counter >= 1)) {
1889                         lq_data->action_counter = 0;
1890                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1891                         rs_set_stay_in_table(1, lq_data);
1892                 }
1893
1894                 /* If we're in an HT mode, and all 3 mode switch actions
1895                  * have been tried and compared, stay in this best modulation
1896                  * mode for a while before next round of mode comparisons. */
1897                 if (lq_data->enable_counter &&
1898                     (lq_data->action_counter >= IWL_ACTION_LIMIT)) {
1899 #ifdef CONFIG_IWL4965_HT_AGG
1900                         /* If appropriate, set up aggregation! */
1901                         if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
1902                             (priv->lq_mngr.agg_ctrl.auto_agg)) {
1903                                 priv->lq_mngr.agg_ctrl.tid_retry =
1904                                     TID_ALL_SPECIFIED;
1905                                 schedule_work(&priv->agg_work);
1906                         }
1907 #endif /*CONFIG_IWL4965_HT_AGG */
1908                         lq_data->action_counter = 0;
1909                         rs_set_stay_in_table(0, lq_data);
1910                 }
1911
1912         /*
1913          * Else, don't search for a new modulation mode.
1914          * Put new timestamp in stay-in-modulation-mode flush timer if:
1915          * 1)  Not changing rates right now
1916          * 2)  Not just finishing up a search
1917          * 3)  flush timer is empty
1918          */
1919         } else {
1920                 if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
1921                         lq_data->flush_timer = jiffies;
1922         }
1923
1924 out:
1925         rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1926         i = index;
1927         sta->last_txrate = i;
1928
1929         /* sta->txrate is an index to A mode rates which start
1930          * at IWL_FIRST_OFDM_RATE
1931          */
1932         if (lq_data->phymode == (u8) MODE_IEEE80211A)
1933                 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1934         else
1935                 sta->txrate = i;
1936
1937         return;
1938 }
1939
1940
1941 static void rs_initialize_lq(struct iwl4965_priv *priv,
1942                              struct sta_info *sta)
1943 {
1944         int i;
1945         struct iwl4965_rate_scale_priv *lq;
1946         struct iwl4965_scale_tbl_info *tbl;
1947         u8 active_tbl = 0;
1948         int rate_idx;
1949         u8 use_green = rs_use_green(priv);
1950         struct iwl4965_rate mcs_rate;
1951
1952         if (!sta || !sta->rate_ctrl_priv)
1953                 goto out;
1954
1955         lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
1956         i = sta->last_txrate;
1957
1958         if ((lq->lq.sta_id == 0xff) &&
1959             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1960                 goto out;
1961
1962         if (!lq->search_better_tbl)
1963                 active_tbl = lq->active_tbl;
1964         else
1965                 active_tbl = 1 - lq->active_tbl;
1966
1967         tbl = &(lq->lq_info[active_tbl]);
1968
1969         if ((i < 0) || (i >= IWL_RATE_COUNT))
1970                 i = 0;
1971
1972         mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
1973         mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1974         mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1975
1976         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1977                 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1978
1979         tbl->antenna_type = ANT_AUX;
1980         rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
1981         if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
1982             rs_toggle_antenna(&mcs_rate, tbl);
1983
1984         rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
1985         tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
1986         rs_get_expected_tpt_table(lq, tbl);
1987         rs_fill_link_cmd(lq, &mcs_rate, &lq->lq);
1988         rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
1989  out:
1990         return;
1991 }
1992
1993 static void rs_get_rate(void *priv_rate, struct net_device *dev,
1994                         struct ieee80211_hw_mode *mode, struct sk_buff *skb,
1995                         struct rate_selection *sel)
1996 {
1997
1998         int i;
1999         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2000         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2001         struct sta_info *sta;
2002         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2003         struct iwl4965_rate_scale_priv *lq;
2004
2005         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2006
2007         sta = sta_info_get(local, hdr->addr1);
2008
2009         if (!sta || !sta->rate_ctrl_priv) {
2010                 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2011                 if (sta)
2012                         sta_info_put(sta);
2013                 return;
2014         }
2015
2016         lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
2017         i = sta->last_txrate;
2018
2019         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
2020                 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2021                 DECLARE_MAC_BUF(mac);
2022
2023                 if (sta_id == IWL_INVALID_STATION) {
2024                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2025                                        print_mac(mac, hdr->addr1));
2026                         sta_id = iwl4965_add_station_flags(priv,
2027                                                  hdr->addr1, 0, CMD_ASYNC);
2028                 }
2029                 if ((sta_id != IWL_INVALID_STATION)) {
2030                         lq->lq.sta_id = sta_id;
2031                         lq->lq.rs_table[0].rate_n_flags = 0;
2032                         lq->ibss_sta_added = 1;
2033                         rs_initialize_lq(priv, sta);
2034                 }
2035                 if (!lq->ibss_sta_added)
2036                         goto done;
2037         }
2038
2039  done:
2040         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2041                 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2042                 return;
2043         }
2044         sta_info_put(sta);
2045
2046         sel->rate = &priv->ieee_rates[i];
2047 }
2048
2049 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2050 {
2051         struct iwl4965_rate_scale_priv *crl;
2052         int i, j;
2053
2054         IWL_DEBUG_RATE("create station rate scale window\n");
2055
2056         crl = kzalloc(sizeof(struct iwl4965_rate_scale_priv), gfp);
2057
2058         if (crl == NULL)
2059                 return NULL;
2060         crl->lq.sta_id = 0xff;
2061
2062
2063         for (j = 0; j < LQ_SIZE; j++)
2064                 for (i = 0; i < IWL_RATE_COUNT; i++)
2065                         rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
2066
2067         return crl;
2068 }
2069
2070 static void rs_rate_init(void *priv_rate, void *priv_sta,
2071                          struct ieee80211_local *local,
2072                          struct sta_info *sta)
2073 {
2074         int i, j;
2075         struct ieee80211_hw_mode *mode = local->oper_hw_mode;
2076         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2077         struct iwl4965_rate_scale_priv *crl = priv_sta;
2078
2079         crl->flush_timer = 0;
2080         crl->supp_rates = sta->supp_rates;
2081         sta->txrate = 3;
2082         for (j = 0; j < LQ_SIZE; j++)
2083                 for (i = 0; i < IWL_RATE_COUNT; i++)
2084                         rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
2085
2086         IWL_DEBUG_RATE("rate scale global init\n");
2087         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2088          * the lowest or the highest rate.. Could consider using RSSI from
2089          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2090          * after assoc.. */
2091
2092         crl->ibss_sta_added = 0;
2093         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2094                 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2095                 DECLARE_MAC_BUF(mac);
2096
2097                 /* for IBSS the call are from tasklet */
2098                 IWL_DEBUG_HT("LQ: ADD station %s\n",
2099                              print_mac(mac, sta->addr));
2100
2101                 if (sta_id == IWL_INVALID_STATION) {
2102                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2103                                        print_mac(mac, sta->addr));
2104                         sta_id = iwl4965_add_station_flags(priv,
2105                                                  sta->addr, 0, CMD_ASYNC);
2106                 }
2107                 if ((sta_id != IWL_INVALID_STATION)) {
2108                         crl->lq.sta_id = sta_id;
2109                         crl->lq.rs_table[0].rate_n_flags = 0;
2110                 }
2111                 /* FIXME: this is w/a remove it later */
2112                 priv->assoc_station_added = 1;
2113         }
2114
2115         /* Find highest tx rate supported by hardware and destination station */
2116         for (i = 0; i < mode->num_rates; i++) {
2117                 if ((sta->supp_rates & BIT(i)) &&
2118                     (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
2119                         sta->txrate = i;
2120         }
2121         sta->last_txrate = sta->txrate;
2122         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2123         if (local->hw.conf.phymode == MODE_IEEE80211A)
2124                 sta->last_txrate += IWL_FIRST_OFDM_RATE;
2125
2126         crl->is_dup = priv->is_dup;
2127         crl->valid_antenna = priv->valid_antenna;
2128         crl->antenna = priv->antenna;
2129         crl->is_green = rs_use_green(priv);
2130         crl->active_rate = priv->active_rate;
2131         crl->active_rate &= ~(0x1000);
2132         crl->active_rate_basic = priv->active_rate_basic;
2133         crl->phymode = priv->phymode;
2134 #ifdef CONFIG_IWL4965_HT
2135         /*
2136          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2137          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2138          */
2139         crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
2140         crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
2141         crl->active_siso_rate &= ~((u16)0x2);
2142         crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
2143
2144         /* Same here */
2145         crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
2146         crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
2147         crl->active_mimo_rate &= ~((u16)0x2);
2148         crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2149         IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
2150                      crl->active_mimo_rate);
2151 #endif /*CONFIG_IWL4965_HT*/
2152 #ifdef CONFIG_MAC80211_DEBUGFS
2153         crl->drv = priv;
2154 #endif
2155
2156         if (priv->assoc_station_added)
2157                 priv->lq_mngr.lq_ready = 1;
2158
2159         rs_initialize_lq(priv, sta);
2160 }
2161
2162 static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
2163                             struct iwl4965_rate *tx_mcs,
2164                             struct iwl4965_link_quality_cmd *lq_cmd)
2165 {
2166         int index = 0;
2167         int rate_idx;
2168         int repeat_rate = 0;
2169         u8 ant_toggle_count = 0;
2170         u8 use_ht_possible = 1;
2171         struct iwl4965_rate new_rate;
2172         struct iwl4965_scale_tbl_info tbl_type = { 0 };
2173
2174         /* Override starting rate (index 0) if needed for debug purposes */
2175         rs_dbgfs_set_mcs(lq_data, tx_mcs, index);
2176
2177         /* Interpret rate_n_flags */
2178         rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
2179                                   &tbl_type, &rate_idx);
2180
2181         /* How many times should we repeat the initial rate? */
2182         if (is_legacy(tbl_type.lq_type)) {
2183                 ant_toggle_count = 1;
2184                 repeat_rate = IWL_NUMBER_TRY;
2185         } else
2186                 repeat_rate = IWL_HT_NUMBER_TRY;
2187
2188         lq_cmd->general_params.mimo_delimiter =
2189                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2190
2191         /* Fill 1st table entry (index 0) */
2192         lq_cmd->rs_table[index].rate_n_flags =
2193                         cpu_to_le32(tx_mcs->rate_n_flags);
2194         new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2195
2196         if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2197                 lq_cmd->general_params.single_stream_ant_msk
2198                         = LINK_QUAL_ANT_A_MSK;
2199         else
2200                 lq_cmd->general_params.single_stream_ant_msk
2201                         = LINK_QUAL_ANT_B_MSK;
2202
2203         index++;
2204         repeat_rate--;
2205
2206         /* Fill rest of rate table */
2207         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2208                 /* Repeat initial/next rate.
2209                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2210                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2211                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2212                         if (is_legacy(tbl_type.lq_type)) {
2213                                 if (ant_toggle_count <
2214                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2215                                         ant_toggle_count++;
2216                                 else {
2217                                         rs_toggle_antenna(&new_rate, &tbl_type);
2218                                         ant_toggle_count = 1;
2219                                 }
2220                         }
2221
2222                         /* Override next rate if needed for debug purposes */
2223                         rs_dbgfs_set_mcs(lq_data, &new_rate, index);
2224
2225                         /* Fill next table entry */
2226                         lq_cmd->rs_table[index].rate_n_flags =
2227                                         cpu_to_le32(new_rate.rate_n_flags);
2228                         repeat_rate--;
2229                         index++;
2230                 }
2231
2232                 rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
2233                                                 &rate_idx);
2234
2235                 /* Indicate to uCode which entries might be MIMO.
2236                  * If initial rate was MIMO, this will finally end up
2237                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2238                 if (is_mimo(tbl_type.lq_type))
2239                         lq_cmd->general_params.mimo_delimiter = index;
2240
2241                 /* Get next rate */
2242                 rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
2243                                   use_ht_possible, &new_rate);
2244
2245                 /* How many times should we repeat the next rate? */
2246                 if (is_legacy(tbl_type.lq_type)) {
2247                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2248                                 ant_toggle_count++;
2249                         else {
2250                                 rs_toggle_antenna(&new_rate, &tbl_type);
2251                                 ant_toggle_count = 1;
2252                         }
2253                         repeat_rate = IWL_NUMBER_TRY;
2254                 } else
2255                         repeat_rate = IWL_HT_NUMBER_TRY;
2256
2257                 /* Don't allow HT rates after next pass.
2258                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2259                 use_ht_possible = 0;
2260
2261                 /* Override next rate if needed for debug purposes */
2262                 rs_dbgfs_set_mcs(lq_data, &new_rate, index);
2263
2264                 /* Fill next table entry */
2265                 lq_cmd->rs_table[index].rate_n_flags =
2266                                 cpu_to_le32(new_rate.rate_n_flags);
2267
2268                 index++;
2269                 repeat_rate--;
2270         }
2271
2272         lq_cmd->general_params.dual_stream_ant_msk = 3;
2273         lq_cmd->agg_params.agg_dis_start_th = 3;
2274         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2275 }
2276
2277 static void *rs_alloc(struct ieee80211_local *local)
2278 {
2279         return local->hw.priv;
2280 }
2281 /* rate scale requires free function to be implemented */
2282 static void rs_free(void *priv_rate)
2283 {
2284         return;
2285 }
2286
2287 static void rs_clear(void *priv_rate)
2288 {
2289         struct iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate;
2290
2291         IWL_DEBUG_RATE("enter\n");
2292
2293         priv->lq_mngr.lq_ready = 0;
2294 #ifdef CONFIG_IWL4965_HT
2295 #ifdef CONFIG_IWL4965_HT_AGG
2296         if (priv->lq_mngr.agg_ctrl.granted_ba)
2297                 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
2298 #endif /*CONFIG_IWL4965_HT_AGG */
2299 #endif /* CONFIG_IWL4965_HT */
2300
2301         IWL_DEBUG_RATE("leave\n");
2302 }
2303
2304 static void rs_free_sta(void *priv, void *priv_sta)
2305 {
2306         struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2307
2308         IWL_DEBUG_RATE("enter\n");
2309         kfree(rs_priv);
2310         IWL_DEBUG_RATE("leave\n");
2311 }
2312
2313
2314 #ifdef CONFIG_MAC80211_DEBUGFS
2315 static int open_file_generic(struct inode *inode, struct file *file)
2316 {
2317         file->private_data = inode->i_private;
2318         return 0;
2319 }
2320 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
2321                                 struct iwl4965_rate *mcs, int index)
2322 {
2323         u32 base_rate;
2324
2325         if (rs_priv->phymode == (u8) MODE_IEEE80211A)
2326                 base_rate = 0x800D;
2327         else
2328                 base_rate = 0x820A;
2329
2330         if (rs_priv->dbg_fixed.rate_n_flags) {
2331                 if (index < 12)
2332                         mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags;
2333                 else
2334                         mcs->rate_n_flags = base_rate;
2335                 IWL_DEBUG_RATE("Fixed rate ON\n");
2336                 return;
2337         }
2338
2339         IWL_DEBUG_RATE("Fixed rate OFF\n");
2340 }
2341
2342 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2343                         const char __user *user_buf, size_t count, loff_t *ppos)
2344 {
2345         struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2346         char buf[64];
2347         int buf_size;
2348         u32 parsed_rate;
2349
2350         memset(buf, 0, sizeof(buf));
2351         buf_size = min(count, sizeof(buf) -  1);
2352         if (copy_from_user(buf, user_buf, buf_size))
2353                 return -EFAULT;
2354
2355         if (sscanf(buf, "%x", &parsed_rate) == 1)
2356                 rs_priv->dbg_fixed.rate_n_flags = parsed_rate;
2357         else
2358                 rs_priv->dbg_fixed.rate_n_flags = 0;
2359
2360         rs_priv->active_rate = 0x0FFF;          /* 1 - 54 MBits, includes CCK */
2361         rs_priv->active_siso_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2362         rs_priv->active_mimo_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2363
2364         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2365                 rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);
2366
2367         if (rs_priv->dbg_fixed.rate_n_flags) {
2368                 rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq);
2369                 rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC);
2370         }
2371
2372         return count;
2373 }
2374
2375 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2376                         char __user *user_buf, size_t count, loff_t *ppos)
2377 {
2378         char buff[1024];
2379         int desc = 0;
2380         int i = 0;
2381
2382         struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2383
2384         desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
2385         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2386                         rs_priv->total_failed, rs_priv->total_success,
2387                         rs_priv->active_rate);
2388         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2389                         rs_priv->dbg_fixed.rate_n_flags);
2390         desc += sprintf(buff+desc, "general:"
2391                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2392                 rs_priv->lq.general_params.flags,
2393                 rs_priv->lq.general_params.mimo_delimiter,
2394                 rs_priv->lq.general_params.single_stream_ant_msk,
2395                 rs_priv->lq.general_params.dual_stream_ant_msk);
2396
2397         desc += sprintf(buff+desc, "agg:"
2398                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2399                         le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
2400                         rs_priv->lq.agg_params.agg_dis_start_th,
2401                         rs_priv->lq.agg_params.agg_frame_cnt_limit);
2402
2403         desc += sprintf(buff+desc,
2404                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2405                         rs_priv->lq.general_params.start_rate_index[0],
2406                         rs_priv->lq.general_params.start_rate_index[1],
2407                         rs_priv->lq.general_params.start_rate_index[2],
2408                         rs_priv->lq.general_params.start_rate_index[3]);
2409
2410
2411         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2412                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2413                         i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));
2414
2415         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2416 }
2417
2418 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2419         .write = rs_sta_dbgfs_scale_table_write,
2420         .read = rs_sta_dbgfs_scale_table_read,
2421         .open = open_file_generic,
2422 };
2423 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2424                         char __user *user_buf, size_t count, loff_t *ppos)
2425 {
2426         char buff[1024];
2427         int desc = 0;
2428         int i, j;
2429
2430         struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2431         for (i = 0; i < LQ_SIZE; i++) {
2432                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2433                                 "rate=0x%X\n",
2434                                 rs_priv->active_tbl == i?"*":"x",
2435                                 rs_priv->lq_info[i].lq_type,
2436                                 rs_priv->lq_info[i].is_SGI,
2437                                 rs_priv->lq_info[i].is_fat,
2438                                 rs_priv->lq_info[i].is_dup,
2439                                 rs_priv->lq_info[i].current_rate.rate_n_flags);
2440                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2441                         desc += sprintf(buff+desc,
2442                                         "counter=%d success=%d %%=%d\n",
2443                                         rs_priv->lq_info[i].win[j].counter,
2444                                         rs_priv->lq_info[i].win[j].success_counter,
2445                                         rs_priv->lq_info[i].win[j].success_ratio);
2446                 }
2447         }
2448         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2449 }
2450
2451 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2452         .read = rs_sta_dbgfs_stats_table_read,
2453         .open = open_file_generic,
2454 };
2455
2456 static void rs_add_debugfs(void *priv, void *priv_sta,
2457                                         struct dentry *dir)
2458 {
2459         struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2460         rs_priv->rs_sta_dbgfs_scale_table_file =
2461                 debugfs_create_file("rate_scale_table", 0600, dir,
2462                                 rs_priv, &rs_sta_dbgfs_scale_table_ops);
2463         rs_priv->rs_sta_dbgfs_stats_table_file =
2464                 debugfs_create_file("rate_stats_table", 0600, dir,
2465                         rs_priv, &rs_sta_dbgfs_stats_table_ops);
2466 }
2467
2468 static void rs_remove_debugfs(void *priv, void *priv_sta)
2469 {
2470         struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2471         debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
2472         debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file);
2473 }
2474 #endif
2475
2476 static struct rate_control_ops rs_ops = {
2477         .module = NULL,
2478         .name = RS_NAME,
2479         .tx_status = rs_tx_status,
2480         .get_rate = rs_get_rate,
2481         .rate_init = rs_rate_init,
2482         .clear = rs_clear,
2483         .alloc = rs_alloc,
2484         .free = rs_free,
2485         .alloc_sta = rs_alloc_sta,
2486         .free_sta = rs_free_sta,
2487 #ifdef CONFIG_MAC80211_DEBUGFS
2488         .add_sta_debugfs = rs_add_debugfs,
2489         .remove_sta_debugfs = rs_remove_debugfs,
2490 #endif
2491 };
2492
2493 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2494 {
2495         struct ieee80211_local *local = hw_to_local(hw);
2496         struct iwl4965_priv *priv = hw->priv;
2497         struct iwl4965_rate_scale_priv *rs_priv;
2498         struct sta_info *sta;
2499         int count = 0, i;
2500         u32 samples = 0, success = 0, good = 0;
2501         unsigned long now = jiffies;
2502         u32 max_time = 0;
2503         u8 lq_type, antenna;
2504
2505         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2506         if (!sta || !sta->rate_ctrl_priv) {
2507                 if (sta) {
2508                         sta_info_put(sta);
2509                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2510                 } else
2511                         IWL_DEBUG_RATE("leave - no station!\n");
2512                 return sprintf(buf, "station %d not found\n", sta_id);
2513         }
2514
2515         rs_priv = (void *)sta->rate_ctrl_priv;
2516
2517         lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
2518         antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
2519
2520         if (is_legacy(lq_type))
2521                 i = IWL_RATE_54M_INDEX;
2522         else
2523                 i = IWL_RATE_60M_INDEX;
2524         while (1) {
2525                 u64 mask;
2526                 int j;
2527                 int active = rs_priv->active_tbl;
2528
2529                 count +=
2530                     sprintf(&buf[count], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2531
2532                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2533                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2534                         buf[count++] =
2535                                 (rs_priv->lq_info[active].win[i].data & mask)
2536                                 ? '1' : '0';
2537
2538                 samples += rs_priv->lq_info[active].win[i].counter;
2539                 good += rs_priv->lq_info[active].win[i].success_counter;
2540                 success += rs_priv->lq_info[active].win[i].success_counter *
2541                            iwl4965_rates[i].ieee;
2542
2543                 if (rs_priv->lq_info[active].win[i].stamp) {
2544                         int delta =
2545                                    jiffies_to_msecs(now -
2546                                    rs_priv->lq_info[active].win[i].stamp);
2547
2548                         if (delta > max_time)
2549                                 max_time = delta;
2550
2551                         count += sprintf(&buf[count], "%5dms\n", delta);
2552                 } else
2553                         buf[count++] = '\n';
2554
2555                 j = iwl4965_get_prev_ieee_rate(i);
2556                 if (j == i)
2557                         break;
2558                 i = j;
2559         }
2560
2561         /* Display the average rate of all samples taken.
2562          *
2563          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2564          * added from iwl4965_rates is actually 2X the rate */
2565         if (samples)
2566                 count += sprintf(&buf[count],
2567                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2568                          "%3d%% success (%d good packets over %d tries)\n",
2569                          success / (2 * samples), (success * 5 / samples) % 10,
2570                          max_time, good * 100 / samples, good, samples);
2571         else
2572                 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
2573         count += sprintf(&buf[count], "\nrate scale type %d antenna %d "
2574                          "active_search %d rate index %d\n", lq_type, antenna,
2575                          rs_priv->search_better_tbl, sta->last_txrate);
2576
2577         sta_info_put(sta);
2578         return count;
2579 }
2580
2581 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2582 {
2583         struct iwl4965_priv *priv = hw->priv;
2584
2585         priv->lq_mngr.lq_ready = 1;
2586 }
2587
2588 void iwl4965_rate_control_register(struct ieee80211_hw *hw)
2589 {
2590         ieee80211_rate_control_register(&rs_ops);
2591 }
2592
2593 void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
2594 {
2595         ieee80211_rate_control_unregister(&rs_ops);
2596 }
2597