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Merge git://git.kernel.org/pub/scm/linux/kernel/git/jk/spufs
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
31 #include <net/ieee80211.h>
32
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
36
37 #include <linux/workqueue.h>
38
39 #include "../net/mac80211/rate.h"
40
41 #include "iwl-4965.h"
42 #include "iwl-core.h"
43 #include "iwl-helpers.h"
44
45 #define RS_NAME "iwl-4965-rs"
46
47 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
48 #define IWL_NUMBER_TRY 1
49 #define IWL_HT_NUMBER_TRY 3
50
51 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
52 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
53 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
54
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
57
58 static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66 };
67
68 struct iwl4965_rate {
69 u32 rate_n_flags;
70 } __attribute__ ((packed));
71
72 /**
73 * struct iwl4965_rate_scale_data -- tx success history for one rate
74 */
75 struct iwl4965_rate_scale_data {
76 u64 data; /* bitmap of successful frames */
77 s32 success_counter; /* number of frames successful */
78 s32 success_ratio; /* per-cent * 128 */
79 s32 counter; /* number of frames attempted */
80 s32 average_tpt; /* success ratio * expected throughput */
81 unsigned long stamp;
82 };
83
84 /**
85 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
86 *
87 * There are two of these in struct iwl4965_lq_sta,
88 * one for "active", and one for "search".
89 */
90 struct iwl4965_scale_tbl_info {
91 enum iwl4965_table_type lq_type;
92 enum iwl4965_antenna_type antenna_type;
93 u8 is_SGI; /* 1 = short guard interval */
94 u8 is_fat; /* 1 = 40 MHz channel width */
95 u8 is_dup; /* 1 = duplicated data streams */
96 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
97 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
98 struct iwl4965_rate current_rate; /* rate_n_flags, uCode API format */
99 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
100 };
101
102 #ifdef CONFIG_IWL4965_HT
103
104 struct iwl4965_traffic_load {
105 unsigned long time_stamp; /* age of the oldest statistics */
106 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
107 * slice */
108 u32 total; /* total num of packets during the
109 * last TID_MAX_TIME_DIFF */
110 u8 queue_count; /* number of queues that has
111 * been used since the last cleanup */
112 u8 head; /* start of the circular buffer */
113 };
114
115 #endif /* CONFIG_IWL4965_HT */
116
117 /**
118 * struct iwl4965_lq_sta -- driver's rate scaling private structure
119 *
120 * Pointer to this gets passed back and forth between driver and mac80211.
121 */
122 struct iwl4965_lq_sta {
123 u8 active_tbl; /* index of active table, range 0-1 */
124 u8 enable_counter; /* indicates HT mode */
125 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
126 u8 search_better_tbl; /* 1: currently trying alternate mode */
127 s32 last_tpt;
128
129 /* The following determine when to search for a new mode */
130 u32 table_count_limit;
131 u32 max_failure_limit; /* # failed frames before new search */
132 u32 max_success_limit; /* # successful frames before new search */
133 u32 table_count;
134 u32 total_failed; /* total failed frames, any/all rates */
135 u32 total_success; /* total successful frames, any/all rates */
136 u32 flush_timer; /* time staying in mode before new search */
137
138 u8 action_counter; /* # mode-switch actions tried */
139 u8 antenna;
140 u8 valid_antenna;
141 u8 is_green;
142 u8 is_dup;
143 enum ieee80211_band band;
144 u8 ibss_sta_added;
145
146 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
147 u32 supp_rates;
148 u16 active_rate;
149 u16 active_siso_rate;
150 u16 active_mimo_rate;
151 u16 active_rate_basic;
152
153 struct iwl_link_quality_cmd lq;
154 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
155 #ifdef CONFIG_IWL4965_HT
156 struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
157 u8 tx_agg_tid_en;
158 #endif
159 #ifdef CONFIG_MAC80211_DEBUGFS
160 struct dentry *rs_sta_dbgfs_scale_table_file;
161 struct dentry *rs_sta_dbgfs_stats_table_file;
162 #ifdef CONFIG_IWL4965_HT
163 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
164 #endif
165 struct iwl4965_rate dbg_fixed;
166 struct iwl_priv *drv;
167 #endif
168 };
169
170 static void rs_rate_scale_perform(struct iwl_priv *priv,
171 struct net_device *dev,
172 struct ieee80211_hdr *hdr,
173 struct sta_info *sta);
174 static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
175 struct iwl4965_rate *tx_mcs,
176 struct iwl_link_quality_cmd *tbl);
177
178
179 #ifdef CONFIG_MAC80211_DEBUGFS
180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
181 struct iwl4965_rate *mcs, int index);
182 #else
183 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
184 struct iwl4965_rate *mcs, int index)
185 {}
186 #endif
187
188 /*
189 * Expected throughput metrics for following rates:
190 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
191 * "G" is the only table that supports CCK (the first 4 rates).
192 */
193 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
194 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
195 };
196
197 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
198 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
199 };
200
201 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
202 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
203 };
204
205 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
206 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
207 };
208
209 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
210 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
211 };
212
213 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
214 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
215 };
216
217 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
218 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
219 };
220
221 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
222 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
223 };
224
225 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
226 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
227 };
228
229 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
230 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
231 };
232
233 static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
234 {
235 return (u8)(rate_n_flags & 0xFF);
236 }
237
238 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
239 {
240 window->data = 0;
241 window->success_counter = 0;
242 window->success_ratio = IWL_INVALID_VALUE;
243 window->counter = 0;
244 window->average_tpt = IWL_INVALID_VALUE;
245 window->stamp = 0;
246 }
247
248 #ifdef CONFIG_IWL4965_HT
249 /*
250 * removes the old data from the statistics. All data that is older than
251 * TID_MAX_TIME_DIFF, will be deleted.
252 */
253 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
254 {
255 /* The oldest age we want to keep */
256 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
257
258 while (tl->queue_count &&
259 (tl->time_stamp < oldest_time)) {
260 tl->total -= tl->packet_count[tl->head];
261 tl->packet_count[tl->head] = 0;
262 tl->time_stamp += TID_QUEUE_CELL_SPACING;
263 tl->queue_count--;
264 tl->head++;
265 if (tl->head >= TID_QUEUE_MAX_SIZE)
266 tl->head = 0;
267 }
268 }
269
270 /*
271 * increment traffic load value for tid and also remove
272 * any old values if passed the certain time period
273 */
274 static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
275 {
276 u32 curr_time = jiffies_to_msecs(jiffies);
277 u32 time_diff;
278 s32 index;
279 struct iwl4965_traffic_load *tl = NULL;
280
281 if (tid >= TID_MAX_LOAD_COUNT)
282 return;
283
284 tl = &lq_data->load[tid];
285
286 curr_time -= curr_time % TID_ROUND_VALUE;
287
288 /* Happens only for the first packet. Initialize the data */
289 if (!(tl->queue_count)) {
290 tl->total = 1;
291 tl->time_stamp = curr_time;
292 tl->queue_count = 1;
293 tl->head = 0;
294 tl->packet_count[0] = 1;
295 return;
296 }
297
298 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
299 index = time_diff / TID_QUEUE_CELL_SPACING;
300
301 /* The history is too long: remove data that is older than */
302 /* TID_MAX_TIME_DIFF */
303 if (index >= TID_QUEUE_MAX_SIZE)
304 rs_tl_rm_old_stats(tl, curr_time);
305
306 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
307 tl->packet_count[index] = tl->packet_count[index] + 1;
308 tl->total = tl->total + 1;
309
310 if ((index + 1) > tl->queue_count)
311 tl->queue_count = index + 1;
312 }
313
314 /*
315 get the traffic load value for tid
316 */
317 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
318 {
319 u32 curr_time = jiffies_to_msecs(jiffies);
320 u32 time_diff;
321 s32 index;
322 struct iwl4965_traffic_load *tl = NULL;
323
324 if (tid >= TID_MAX_LOAD_COUNT)
325 return 0;
326
327 tl = &(lq_data->load[tid]);
328
329 curr_time -= curr_time % TID_ROUND_VALUE;
330
331 if (!(tl->queue_count))
332 return 0;
333
334 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
335 index = time_diff / TID_QUEUE_CELL_SPACING;
336
337 /* The history is too long: remove data that is older than */
338 /* TID_MAX_TIME_DIFF */
339 if (index >= TID_QUEUE_MAX_SIZE)
340 rs_tl_rm_old_stats(tl, curr_time);
341
342 return tl->total;
343 }
344
345 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
346 struct iwl4965_lq_sta *lq_data, u8 tid,
347 struct sta_info *sta)
348 {
349 unsigned long state;
350 DECLARE_MAC_BUF(mac);
351
352 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
353 state = sta->ampdu_mlme.tid_state_tx[tid];
354 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
355
356 if (state == HT_AGG_STATE_IDLE &&
357 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
358 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
359 print_mac(mac, sta->addr), tid);
360 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
361 }
362 }
363
364 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
365 struct iwl4965_lq_sta *lq_data,
366 struct sta_info *sta)
367 {
368 if ((tid < TID_MAX_LOAD_COUNT))
369 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
370 else if (tid == IWL_AGG_ALL_TID)
371 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
372 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
373 }
374
375 #endif /* CONFIG_IWLWIFI_HT */
376
377 /**
378 * rs_collect_tx_data - Update the success/failure sliding window
379 *
380 * We keep a sliding window of the last 62 packets transmitted
381 * at this rate. window->data contains the bitmask of successful
382 * packets.
383 */
384 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
385 int scale_index, s32 tpt, int retries,
386 int successes)
387 {
388 struct iwl4965_rate_scale_data *window = NULL;
389 u64 mask;
390 u8 win_size = IWL_RATE_MAX_WINDOW;
391 s32 fail_count;
392
393 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
394 return -EINVAL;
395
396 /* Select data for current tx bit rate */
397 window = &(windows[scale_index]);
398
399 /*
400 * Keep track of only the latest 62 tx frame attempts in this rate's
401 * history window; anything older isn't really relevant any more.
402 * If we have filled up the sliding window, drop the oldest attempt;
403 * if the oldest attempt (highest bit in bitmap) shows "success",
404 * subtract "1" from the success counter (this is the main reason
405 * we keep these bitmaps!).
406 */
407 while (retries > 0) {
408 if (window->counter >= win_size) {
409 window->counter = win_size - 1;
410 mask = 1;
411 mask = (mask << (win_size - 1));
412 if (window->data & mask) {
413 window->data &= ~mask;
414 window->success_counter =
415 window->success_counter - 1;
416 }
417 }
418
419 /* Increment frames-attempted counter */
420 window->counter++;
421
422 /* Shift bitmap by one frame (throw away oldest history),
423 * OR in "1", and increment "success" if this
424 * frame was successful. */
425 mask = window->data;
426 window->data = (mask << 1);
427 if (successes > 0) {
428 window->success_counter = window->success_counter + 1;
429 window->data |= 0x1;
430 successes--;
431 }
432
433 retries--;
434 }
435
436 /* Calculate current success ratio, avoid divide-by-0! */
437 if (window->counter > 0)
438 window->success_ratio = 128 * (100 * window->success_counter)
439 / window->counter;
440 else
441 window->success_ratio = IWL_INVALID_VALUE;
442
443 fail_count = window->counter - window->success_counter;
444
445 /* Calculate average throughput, if we have enough history. */
446 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
447 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
448 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
449 else
450 window->average_tpt = IWL_INVALID_VALUE;
451
452 /* Tag this window as having been updated */
453 window->stamp = jiffies;
454
455 return 0;
456 }
457
458 /*
459 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
460 */
461 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
462 struct iwl4965_scale_tbl_info *tbl,
463 int index, u8 use_green)
464 {
465 if (is_legacy(tbl->lq_type)) {
466 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
467 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
468 mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
469
470 } else if (is_siso(tbl->lq_type)) {
471 if (index > IWL_LAST_OFDM_RATE)
472 index = IWL_LAST_OFDM_RATE;
473 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
474 RATE_MCS_HT_MSK;
475 } else {
476 if (index > IWL_LAST_OFDM_RATE)
477 index = IWL_LAST_OFDM_RATE;
478 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
479 RATE_MCS_HT_MSK;
480 }
481
482 switch (tbl->antenna_type) {
483 case ANT_BOTH:
484 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
485 break;
486 case ANT_MAIN:
487 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
488 break;
489 case ANT_AUX:
490 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
491 break;
492 case ANT_NONE:
493 break;
494 }
495
496 if (is_legacy(tbl->lq_type))
497 return;
498
499 if (tbl->is_fat) {
500 if (tbl->is_dup)
501 mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
502 else
503 mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
504 }
505 if (tbl->is_SGI)
506 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
507
508 if (use_green) {
509 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
510 if (is_siso(tbl->lq_type))
511 mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
512 }
513 }
514
515 /*
516 * Interpret uCode API's rate_n_flags format,
517 * fill "search" or "active" tx mode table.
518 */
519 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
520 enum ieee80211_band band,
521 struct iwl4965_scale_tbl_info *tbl,
522 int *rate_idx)
523 {
524 int index;
525 u32 ant_msk;
526
527 index = iwl4965_hwrate_to_plcp_idx(mcs_rate->rate_n_flags);
528
529 if (index == IWL_RATE_INVALID) {
530 *rate_idx = -1;
531 return -EINVAL;
532 }
533 tbl->is_SGI = 0; /* default legacy setup */
534 tbl->is_fat = 0;
535 tbl->is_dup = 0;
536 tbl->antenna_type = ANT_BOTH; /* default MIMO setup */
537
538 /* legacy rate format */
539 if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
540 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
541
542 if (ant_msk == RATE_MCS_ANT_AB_MSK)
543 tbl->lq_type = LQ_NONE;
544 else {
545
546 if (band == IEEE80211_BAND_5GHZ)
547 tbl->lq_type = LQ_A;
548 else
549 tbl->lq_type = LQ_G;
550
551 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
552 tbl->antenna_type = ANT_MAIN;
553 else
554 tbl->antenna_type = ANT_AUX;
555 }
556 *rate_idx = index;
557
558 /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
559 } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
560 <= IWL_RATE_SISO_60M_PLCP) {
561 tbl->lq_type = LQ_SISO;
562
563 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
564 if (ant_msk == RATE_MCS_ANT_AB_MSK)
565 tbl->lq_type = LQ_NONE;
566 else {
567 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
568 tbl->antenna_type = ANT_MAIN;
569 else
570 tbl->antenna_type = ANT_AUX;
571 }
572 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
573 tbl->is_SGI = 1;
574
575 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
576 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
577 tbl->is_fat = 1;
578
579 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
580 tbl->is_dup = 1;
581
582 *rate_idx = index;
583
584 /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
585 } else {
586 tbl->lq_type = LQ_MIMO;
587 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
588 tbl->is_SGI = 1;
589
590 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
591 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
592 tbl->is_fat = 1;
593
594 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
595 tbl->is_dup = 1;
596 *rate_idx = index;
597 }
598 return 0;
599 }
600
601 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
602 struct iwl4965_scale_tbl_info *tbl)
603 {
604 if (tbl->antenna_type == ANT_AUX) {
605 tbl->antenna_type = ANT_MAIN;
606 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
607 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
608 } else {
609 tbl->antenna_type = ANT_AUX;
610 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
611 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
612 }
613 }
614
615 static inline u8 rs_use_green(struct iwl_priv *priv,
616 struct ieee80211_conf *conf)
617 {
618 #ifdef CONFIG_IWL4965_HT
619 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
620 priv->current_ht_config.is_green_field &&
621 !priv->current_ht_config.non_GF_STA_present);
622 #endif /* CONFIG_IWL4965_HT */
623 return 0;
624 }
625
626 /**
627 * rs_get_supported_rates - get the available rates
628 *
629 * if management frame or broadcast frame only return
630 * basic available rates.
631 *
632 */
633 static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
634 struct ieee80211_hdr *hdr,
635 enum iwl4965_table_type rate_type,
636 u16 *data_rate)
637 {
638 if (is_legacy(rate_type))
639 *data_rate = lq_sta->active_rate;
640 else {
641 if (is_siso(rate_type))
642 *data_rate = lq_sta->active_siso_rate;
643 else
644 *data_rate = lq_sta->active_mimo_rate;
645 }
646
647 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
648 lq_sta->active_rate_basic) {
649 *data_rate = lq_sta->active_rate_basic;
650 }
651 }
652
653 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
654 {
655 u8 high = IWL_RATE_INVALID;
656 u8 low = IWL_RATE_INVALID;
657
658 /* 802.11A or ht walks to the next literal adjacent rate in
659 * the rate table */
660 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
661 int i;
662 u32 mask;
663
664 /* Find the previous rate that is in the rate mask */
665 i = index - 1;
666 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
667 if (rate_mask & mask) {
668 low = i;
669 break;
670 }
671 }
672
673 /* Find the next rate that is in the rate mask */
674 i = index + 1;
675 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
676 if (rate_mask & mask) {
677 high = i;
678 break;
679 }
680 }
681
682 return (high << 8) | low;
683 }
684
685 low = index;
686 while (low != IWL_RATE_INVALID) {
687 low = iwl4965_rates[low].prev_rs;
688 if (low == IWL_RATE_INVALID)
689 break;
690 if (rate_mask & (1 << low))
691 break;
692 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
693 }
694
695 high = index;
696 while (high != IWL_RATE_INVALID) {
697 high = iwl4965_rates[high].next_rs;
698 if (high == IWL_RATE_INVALID)
699 break;
700 if (rate_mask & (1 << high))
701 break;
702 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
703 }
704
705 return (high << 8) | low;
706 }
707
708 static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
709 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
710 u8 ht_possible, struct iwl4965_rate *mcs_rate)
711 {
712 s32 low;
713 u16 rate_mask;
714 u16 high_low;
715 u8 switch_to_legacy = 0;
716 u8 is_green = lq_sta->is_green;
717
718 /* check if we need to switch from HT to legacy rates.
719 * assumption is that mandatory rates (1Mbps or 6Mbps)
720 * are always supported (spec demand) */
721 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
722 switch_to_legacy = 1;
723 scale_index = rs_ht_to_legacy[scale_index];
724 if (lq_sta->band == IEEE80211_BAND_5GHZ)
725 tbl->lq_type = LQ_A;
726 else
727 tbl->lq_type = LQ_G;
728
729 if ((tbl->antenna_type == ANT_BOTH) ||
730 (tbl->antenna_type == ANT_NONE))
731 tbl->antenna_type = ANT_MAIN;
732
733 tbl->is_fat = 0;
734 tbl->is_SGI = 0;
735 }
736
737 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
738
739 /* Mask with station rate restriction */
740 if (is_legacy(tbl->lq_type)) {
741 /* supp_rates has no CCK bits in A mode */
742 if (lq_sta->band == IEEE80211_BAND_5GHZ)
743 rate_mask = (u16)(rate_mask &
744 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
745 else
746 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
747 }
748
749 /* If we switched from HT to legacy, check current rate */
750 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
751 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
752 return;
753 }
754
755 high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
756 low = high_low & 0xff;
757
758 if (low != IWL_RATE_INVALID)
759 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
760 else
761 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
762 }
763
764 /*
765 * mac80211 sends us Tx status
766 */
767 static void rs_tx_status(void *priv_rate, struct net_device *dev,
768 struct sk_buff *skb,
769 struct ieee80211_tx_status *tx_resp)
770 {
771 int status;
772 u8 retries;
773 int rs_index, index = 0;
774 struct iwl4965_lq_sta *lq_sta;
775 struct iwl_link_quality_cmd *table;
776 struct sta_info *sta;
777 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
778 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
779 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
780 struct ieee80211_hw *hw = local_to_hw(local);
781 struct iwl4965_rate_scale_data *window = NULL;
782 struct iwl4965_rate_scale_data *search_win = NULL;
783 struct iwl4965_rate tx_mcs;
784 struct iwl4965_scale_tbl_info tbl_type;
785 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
786 u8 active_index = 0;
787 u16 fc = le16_to_cpu(hdr->frame_control);
788 s32 tpt = 0;
789
790 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
791
792 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
793 return;
794
795 /* This packet was aggregated but doesn't carry rate scale info */
796 if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
797 !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
798 return;
799
800 retries = tx_resp->retry_count;
801
802 if (retries > 15)
803 retries = 15;
804
805 rcu_read_lock();
806
807 sta = sta_info_get(local, hdr->addr1);
808
809 if (!sta || !sta->rate_ctrl_priv)
810 goto out;
811
812
813 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
814
815 if (!priv->lq_mngr.lq_ready)
816 goto out;
817
818 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
819 !lq_sta->ibss_sta_added)
820 goto out;
821
822 table = &lq_sta->lq;
823 active_index = lq_sta->active_tbl;
824
825 /* Get mac80211 antenna info */
826 lq_sta->antenna =
827 (lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx);
828 if (!lq_sta->antenna)
829 lq_sta->antenna = lq_sta->valid_antenna;
830
831 /* Ignore mac80211 antenna info for now */
832 lq_sta->antenna = lq_sta->valid_antenna;
833
834 curr_tbl = &(lq_sta->lq_info[active_index]);
835 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
836 window = (struct iwl4965_rate_scale_data *)
837 &(curr_tbl->win[0]);
838 search_win = (struct iwl4965_rate_scale_data *)
839 &(search_tbl->win[0]);
840
841 /*
842 * Ignore this Tx frame response if its initial rate doesn't match
843 * that of latest Link Quality command. There may be stragglers
844 * from a previous Link Quality command, but we're no longer interested
845 * in those; they're either from the "active" mode while we're trying
846 * to check "search" mode, or a prior "search" mode after we've moved
847 * to a new "search" mode (which might become the new "active" mode).
848 */
849 tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[0].rate_n_flags);
850 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
851 if (priv->band == IEEE80211_BAND_5GHZ)
852 rs_index -= IWL_FIRST_OFDM_RATE;
853
854 if ((tx_resp->control.tx_rate == NULL) ||
855 (tbl_type.is_SGI ^
856 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
857 (tbl_type.is_fat ^
858 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
859 (tbl_type.is_dup ^
860 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
861 (tbl_type.antenna_type ^
862 tx_resp->control.antenna_sel_tx) ||
863 (!!(tx_mcs.rate_n_flags & RATE_MCS_HT_MSK) ^
864 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
865 (!!(tx_mcs.rate_n_flags & RATE_MCS_GF_MSK) ^
866 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
867 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
868 tx_resp->control.tx_rate->bitrate)) {
869 IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
870 tx_mcs.rate_n_flags);
871 goto out;
872 }
873
874 /* Update frame history window with "failure" for each Tx retry. */
875 while (retries) {
876 /* Look up the rate and other info used for each tx attempt.
877 * Each tx attempt steps one entry deeper in the rate table. */
878 tx_mcs.rate_n_flags =
879 le32_to_cpu(table->rs_table[index].rate_n_flags);
880 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band,
881 &tbl_type, &rs_index);
882
883 /* If type matches "search" table,
884 * add failure to "search" history */
885 if ((tbl_type.lq_type == search_tbl->lq_type) &&
886 (tbl_type.antenna_type == search_tbl->antenna_type) &&
887 (tbl_type.is_SGI == search_tbl->is_SGI)) {
888 if (search_tbl->expected_tpt)
889 tpt = search_tbl->expected_tpt[rs_index];
890 else
891 tpt = 0;
892 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
893
894 /* Else if type matches "current/active" table,
895 * add failure to "current/active" history */
896 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
897 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
898 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
899 if (curr_tbl->expected_tpt)
900 tpt = curr_tbl->expected_tpt[rs_index];
901 else
902 tpt = 0;
903 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
904 }
905
906 /* If not searching for a new mode, increment failed counter
907 * ... this helps determine when to start searching again */
908 if (lq_sta->stay_in_tbl)
909 lq_sta->total_failed++;
910 --retries;
911 index++;
912
913 }
914
915 /*
916 * Find (by rate) the history window to update with final Tx attempt;
917 * if Tx was successful first try, use original rate,
918 * else look up the rate that was, finally, successful.
919 */
920 tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags);
921 rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
922
923 /* Update frame history window with "success" if Tx got ACKed ... */
924 if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
925 status = 1;
926 else
927 status = 0;
928
929 /* If type matches "search" table,
930 * add final tx status to "search" history */
931 if ((tbl_type.lq_type == search_tbl->lq_type) &&
932 (tbl_type.antenna_type == search_tbl->antenna_type) &&
933 (tbl_type.is_SGI == search_tbl->is_SGI)) {
934 if (search_tbl->expected_tpt)
935 tpt = search_tbl->expected_tpt[rs_index];
936 else
937 tpt = 0;
938 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
939 rs_collect_tx_data(search_win, rs_index, tpt,
940 tx_resp->ampdu_ack_len,
941 tx_resp->ampdu_ack_map);
942 else
943 rs_collect_tx_data(search_win, rs_index, tpt,
944 1, status);
945 /* Else if type matches "current/active" table,
946 * add final tx status to "current/active" history */
947 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
948 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
949 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
950 if (curr_tbl->expected_tpt)
951 tpt = curr_tbl->expected_tpt[rs_index];
952 else
953 tpt = 0;
954 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
955 rs_collect_tx_data(window, rs_index, tpt,
956 tx_resp->ampdu_ack_len,
957 tx_resp->ampdu_ack_map);
958 else
959 rs_collect_tx_data(window, rs_index, tpt,
960 1, status);
961 }
962
963 /* If not searching for new mode, increment success/failed counter
964 * ... these help determine when to start searching again */
965 if (lq_sta->stay_in_tbl) {
966 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
967 lq_sta->total_success += tx_resp->ampdu_ack_map;
968 lq_sta->total_failed +=
969 (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
970 } else {
971 if (status)
972 lq_sta->total_success++;
973 else
974 lq_sta->total_failed++;
975 }
976 }
977
978 /* See if there's a better rate or modulation mode to try. */
979 rs_rate_scale_perform(priv, dev, hdr, sta);
980 out:
981 rcu_read_unlock();
982 return;
983 }
984
985 static u8 rs_is_ant_connected(u8 valid_antenna,
986 enum iwl4965_antenna_type antenna_type)
987 {
988 if (antenna_type == ANT_AUX)
989 return ((valid_antenna & 0x2) ? 1:0);
990 else if (antenna_type == ANT_MAIN)
991 return ((valid_antenna & 0x1) ? 1:0);
992 else if (antenna_type == ANT_BOTH)
993 return ((valid_antenna & 0x3) == 0x3);
994
995 return 1;
996 }
997
998 static u8 rs_is_other_ant_connected(u8 valid_antenna,
999 enum iwl4965_antenna_type antenna_type)
1000 {
1001 if (antenna_type == ANT_AUX)
1002 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
1003 else
1004 return rs_is_ant_connected(valid_antenna, ANT_AUX);
1005
1006 return 0;
1007 }
1008
1009 /*
1010 * Begin a period of staying with a selected modulation mode.
1011 * Set "stay_in_tbl" flag to prevent any mode switches.
1012 * Set frame tx success limits according to legacy vs. high-throughput,
1013 * and reset overall (spanning all rates) tx success history statistics.
1014 * These control how long we stay using same modulation mode before
1015 * searching for a new mode.
1016 */
1017 static void rs_set_stay_in_table(u8 is_legacy,
1018 struct iwl4965_lq_sta *lq_sta)
1019 {
1020 IWL_DEBUG_HT("we are staying in the same table\n");
1021 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1022 if (is_legacy) {
1023 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1024 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1025 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1026 } else {
1027 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1028 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1029 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1030 }
1031 lq_sta->table_count = 0;
1032 lq_sta->total_failed = 0;
1033 lq_sta->total_success = 0;
1034 }
1035
1036 /*
1037 * Find correct throughput table for given mode of modulation
1038 */
1039 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1040 struct iwl4965_scale_tbl_info *tbl)
1041 {
1042 if (is_legacy(tbl->lq_type)) {
1043 if (!is_a_band(tbl->lq_type))
1044 tbl->expected_tpt = expected_tpt_G;
1045 else
1046 tbl->expected_tpt = expected_tpt_A;
1047 } else if (is_siso(tbl->lq_type)) {
1048 if (tbl->is_fat && !lq_sta->is_dup)
1049 if (tbl->is_SGI)
1050 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1051 else
1052 tbl->expected_tpt = expected_tpt_siso40MHz;
1053 else if (tbl->is_SGI)
1054 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1055 else
1056 tbl->expected_tpt = expected_tpt_siso20MHz;
1057
1058 } else if (is_mimo(tbl->lq_type)) {
1059 if (tbl->is_fat && !lq_sta->is_dup)
1060 if (tbl->is_SGI)
1061 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1062 else
1063 tbl->expected_tpt = expected_tpt_mimo40MHz;
1064 else if (tbl->is_SGI)
1065 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1066 else
1067 tbl->expected_tpt = expected_tpt_mimo20MHz;
1068 } else
1069 tbl->expected_tpt = expected_tpt_G;
1070 }
1071
1072 #ifdef CONFIG_IWL4965_HT
1073 /*
1074 * Find starting rate for new "search" high-throughput mode of modulation.
1075 * Goal is to find lowest expected rate (under perfect conditions) that is
1076 * above the current measured throughput of "active" mode, to give new mode
1077 * a fair chance to prove itself without too many challenges.
1078 *
1079 * This gets called when transitioning to more aggressive modulation
1080 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1081 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1082 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1083 * bit rate will typically need to increase, but not if performance was bad.
1084 */
1085 static s32 rs_get_best_rate(struct iwl_priv *priv,
1086 struct iwl4965_lq_sta *lq_sta,
1087 struct iwl4965_scale_tbl_info *tbl, /* "search" */
1088 u16 rate_mask, s8 index, s8 rate)
1089 {
1090 /* "active" values */
1091 struct iwl4965_scale_tbl_info *active_tbl =
1092 &(lq_sta->lq_info[lq_sta->active_tbl]);
1093 s32 active_sr = active_tbl->win[index].success_ratio;
1094 s32 active_tpt = active_tbl->expected_tpt[index];
1095
1096 /* expected "search" throughput */
1097 s32 *tpt_tbl = tbl->expected_tpt;
1098
1099 s32 new_rate, high, low, start_hi;
1100 u16 high_low;
1101
1102 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1103
1104 for (; ;) {
1105 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1106
1107 low = high_low & 0xff;
1108 high = (high_low >> 8) & 0xff;
1109
1110 /*
1111 * Lower the "search" bit rate, to give new "search" mode
1112 * approximately the same throughput as "active" if:
1113 *
1114 * 1) "Active" mode has been working modestly well (but not
1115 * great), and expected "search" throughput (under perfect
1116 * conditions) at candidate rate is above the actual
1117 * measured "active" throughput (but less than expected
1118 * "active" throughput under perfect conditions).
1119 * OR
1120 * 2) "Active" mode has been working perfectly or very well
1121 * and expected "search" throughput (under perfect
1122 * conditions) at candidate rate is above expected
1123 * "active" throughput (under perfect conditions).
1124 */
1125 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1126 ((active_sr > IWL_RATE_DECREASE_TH) &&
1127 (active_sr <= IWL_RATE_HIGH_TH) &&
1128 (tpt_tbl[rate] <= active_tpt))) ||
1129 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1130 (tpt_tbl[rate] > active_tpt))) {
1131
1132 /* (2nd or later pass)
1133 * If we've already tried to raise the rate, and are
1134 * now trying to lower it, use the higher rate. */
1135 if (start_hi != IWL_RATE_INVALID) {
1136 new_rate = start_hi;
1137 break;
1138 }
1139
1140 new_rate = rate;
1141
1142 /* Loop again with lower rate */
1143 if (low != IWL_RATE_INVALID)
1144 rate = low;
1145
1146 /* Lower rate not available, use the original */
1147 else
1148 break;
1149
1150 /* Else try to raise the "search" rate to match "active" */
1151 } else {
1152 /* (2nd or later pass)
1153 * If we've already tried to lower the rate, and are
1154 * now trying to raise it, use the lower rate. */
1155 if (new_rate != IWL_RATE_INVALID)
1156 break;
1157
1158 /* Loop again with higher rate */
1159 else if (high != IWL_RATE_INVALID) {
1160 start_hi = high;
1161 rate = high;
1162
1163 /* Higher rate not available, use the original */
1164 } else {
1165 new_rate = rate;
1166 break;
1167 }
1168 }
1169 }
1170
1171 return new_rate;
1172 }
1173 #endif /* CONFIG_IWL4965_HT */
1174
1175 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1176 {
1177 return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1178 }
1179
1180 /*
1181 * Set up search table for MIMO
1182 */
1183 static int rs_switch_to_mimo(struct iwl_priv *priv,
1184 struct iwl4965_lq_sta *lq_sta,
1185 struct ieee80211_conf *conf,
1186 struct sta_info *sta,
1187 struct iwl4965_scale_tbl_info *tbl, int index)
1188 {
1189 #ifdef CONFIG_IWL4965_HT
1190 u16 rate_mask;
1191 s32 rate;
1192 s8 is_green = lq_sta->is_green;
1193
1194 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1195 !sta->ht_info.ht_supported)
1196 return -1;
1197
1198 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1199 tbl->lq_type = LQ_MIMO;
1200 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1201 &rate_mask);
1202
1203 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1204 return -1;
1205
1206 /* Need both Tx chains/antennas to support MIMO */
1207 if (!rs_is_both_ant_supp(lq_sta->antenna))
1208 return -1;
1209
1210 tbl->is_dup = lq_sta->is_dup;
1211 tbl->action = 0;
1212 if (priv->current_ht_config.supported_chan_width
1213 == IWL_CHANNEL_WIDTH_40MHZ)
1214 tbl->is_fat = 1;
1215 else
1216 tbl->is_fat = 0;
1217
1218 if (tbl->is_fat) {
1219 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1220 tbl->is_SGI = 1;
1221 else
1222 tbl->is_SGI = 0;
1223 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1224 tbl->is_SGI = 1;
1225 else
1226 tbl->is_SGI = 0;
1227
1228 rs_get_expected_tpt_table(lq_sta, tbl);
1229
1230 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1231
1232 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1233 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1234 return -1;
1235 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1236
1237 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1238 tbl->current_rate.rate_n_flags, is_green);
1239 return 0;
1240 #else
1241 return -1;
1242 #endif /*CONFIG_IWL4965_HT */
1243 }
1244
1245 /*
1246 * Set up search table for SISO
1247 */
1248 static int rs_switch_to_siso(struct iwl_priv *priv,
1249 struct iwl4965_lq_sta *lq_sta,
1250 struct ieee80211_conf *conf,
1251 struct sta_info *sta,
1252 struct iwl4965_scale_tbl_info *tbl, int index)
1253 {
1254 #ifdef CONFIG_IWL4965_HT
1255 u16 rate_mask;
1256 u8 is_green = lq_sta->is_green;
1257 s32 rate;
1258
1259 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1260 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1261 !sta->ht_info.ht_supported)
1262 return -1;
1263
1264 tbl->is_dup = lq_sta->is_dup;
1265 tbl->lq_type = LQ_SISO;
1266 tbl->action = 0;
1267 rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1268 &rate_mask);
1269
1270 if (priv->current_ht_config.supported_chan_width
1271 == IWL_CHANNEL_WIDTH_40MHZ)
1272 tbl->is_fat = 1;
1273 else
1274 tbl->is_fat = 0;
1275
1276 if (tbl->is_fat) {
1277 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1278 tbl->is_SGI = 1;
1279 else
1280 tbl->is_SGI = 0;
1281 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1282 tbl->is_SGI = 1;
1283 else
1284 tbl->is_SGI = 0;
1285
1286 if (is_green)
1287 tbl->is_SGI = 0;
1288
1289 rs_get_expected_tpt_table(lq_sta, tbl);
1290 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1291
1292 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1293 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1294 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1295 rate, rate_mask);
1296 return -1;
1297 }
1298 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1299 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1300 tbl->current_rate.rate_n_flags, is_green);
1301 return 0;
1302 #else
1303 return -1;
1304
1305 #endif /*CONFIG_IWL4965_HT */
1306 }
1307
1308 /*
1309 * Try to switch to new modulation mode from legacy
1310 */
1311 static int rs_move_legacy_other(struct iwl_priv *priv,
1312 struct iwl4965_lq_sta *lq_sta,
1313 struct ieee80211_conf *conf,
1314 struct sta_info *sta,
1315 int index)
1316 {
1317 int ret = 0;
1318 struct iwl4965_scale_tbl_info *tbl =
1319 &(lq_sta->lq_info[lq_sta->active_tbl]);
1320 struct iwl4965_scale_tbl_info *search_tbl =
1321 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1322 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1323 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1324 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1325 u8 start_action = tbl->action;
1326
1327 for (; ;) {
1328 switch (tbl->action) {
1329 case IWL_LEGACY_SWITCH_ANTENNA:
1330 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1331
1332 search_tbl->lq_type = LQ_NONE;
1333 lq_sta->action_counter++;
1334
1335 /* Don't change antenna if success has been great */
1336 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1337 break;
1338
1339 /* Don't change antenna if other one is not connected */
1340 if (!rs_is_other_ant_connected(lq_sta->antenna,
1341 tbl->antenna_type))
1342 break;
1343
1344 /* Set up search table to try other antenna */
1345 memcpy(search_tbl, tbl, sz);
1346
1347 rs_toggle_antenna(&(search_tbl->current_rate),
1348 search_tbl);
1349 rs_get_expected_tpt_table(lq_sta, search_tbl);
1350 lq_sta->search_better_tbl = 1;
1351 goto out;
1352
1353 case IWL_LEGACY_SWITCH_SISO:
1354 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1355
1356 /* Set up search table to try SISO */
1357 memcpy(search_tbl, tbl, sz);
1358 search_tbl->lq_type = LQ_SISO;
1359 search_tbl->is_SGI = 0;
1360 search_tbl->is_fat = 0;
1361 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1362 search_tbl, index);
1363 if (!ret) {
1364 lq_sta->search_better_tbl = 1;
1365 lq_sta->action_counter = 0;
1366 goto out;
1367 }
1368
1369 break;
1370 case IWL_LEGACY_SWITCH_MIMO:
1371 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1372
1373 /* Set up search table to try MIMO */
1374 memcpy(search_tbl, tbl, sz);
1375 search_tbl->lq_type = LQ_MIMO;
1376 search_tbl->is_SGI = 0;
1377 search_tbl->is_fat = 0;
1378 search_tbl->antenna_type = ANT_BOTH;
1379 ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1380 search_tbl, index);
1381 if (!ret) {
1382 lq_sta->search_better_tbl = 1;
1383 lq_sta->action_counter = 0;
1384 goto out;
1385 }
1386 break;
1387 }
1388 tbl->action++;
1389 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1390 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1391
1392 if (tbl->action == start_action)
1393 break;
1394
1395 }
1396 return 0;
1397
1398 out:
1399 tbl->action++;
1400 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1401 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1402 return 0;
1403
1404 }
1405
1406 /*
1407 * Try to switch to new modulation mode from SISO
1408 */
1409 static int rs_move_siso_to_other(struct iwl_priv *priv,
1410 struct iwl4965_lq_sta *lq_sta,
1411 struct ieee80211_conf *conf,
1412 struct sta_info *sta,
1413 int index)
1414 {
1415 int ret;
1416 u8 is_green = lq_sta->is_green;
1417 struct iwl4965_scale_tbl_info *tbl =
1418 &(lq_sta->lq_info[lq_sta->active_tbl]);
1419 struct iwl4965_scale_tbl_info *search_tbl =
1420 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1421 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1422 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1423 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1424 u8 start_action = tbl->action;
1425
1426 for (;;) {
1427 lq_sta->action_counter++;
1428 switch (tbl->action) {
1429 case IWL_SISO_SWITCH_ANTENNA:
1430 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1431 search_tbl->lq_type = LQ_NONE;
1432 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1433 break;
1434 if (!rs_is_other_ant_connected(lq_sta->antenna,
1435 tbl->antenna_type))
1436 break;
1437
1438 memcpy(search_tbl, tbl, sz);
1439 search_tbl->action = IWL_SISO_SWITCH_MIMO;
1440 rs_toggle_antenna(&(search_tbl->current_rate),
1441 search_tbl);
1442 lq_sta->search_better_tbl = 1;
1443
1444 goto out;
1445
1446 case IWL_SISO_SWITCH_MIMO:
1447 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1448 memcpy(search_tbl, tbl, sz);
1449 search_tbl->lq_type = LQ_MIMO;
1450 search_tbl->is_SGI = 0;
1451 search_tbl->is_fat = 0;
1452 search_tbl->antenna_type = ANT_BOTH;
1453 ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1454 search_tbl, index);
1455 if (!ret) {
1456 lq_sta->search_better_tbl = 1;
1457 goto out;
1458 }
1459 break;
1460 case IWL_SISO_SWITCH_GI:
1461 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1462
1463 memcpy(search_tbl, tbl, sz);
1464 search_tbl->action = 0;
1465 if (search_tbl->is_SGI)
1466 search_tbl->is_SGI = 0;
1467 else if (!is_green)
1468 search_tbl->is_SGI = 1;
1469 else
1470 break;
1471 lq_sta->search_better_tbl = 1;
1472 if ((tbl->lq_type == LQ_SISO) &&
1473 (tbl->is_SGI)) {
1474 s32 tpt = lq_sta->last_tpt / 100;
1475 if (((!tbl->is_fat) &&
1476 (tpt >= expected_tpt_siso20MHz[index])) ||
1477 ((tbl->is_fat) &&
1478 (tpt >= expected_tpt_siso40MHz[index])))
1479 lq_sta->search_better_tbl = 0;
1480 }
1481 rs_get_expected_tpt_table(lq_sta, search_tbl);
1482 rs_mcs_from_tbl(&search_tbl->current_rate,
1483 search_tbl, index, is_green);
1484 goto out;
1485 }
1486 tbl->action++;
1487 if (tbl->action > IWL_SISO_SWITCH_GI)
1488 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1489
1490 if (tbl->action == start_action)
1491 break;
1492 }
1493 return 0;
1494
1495 out:
1496 tbl->action++;
1497 if (tbl->action > IWL_SISO_SWITCH_GI)
1498 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1499 return 0;
1500 }
1501
1502 /*
1503 * Try to switch to new modulation mode from MIMO
1504 */
1505 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1506 struct iwl4965_lq_sta *lq_sta,
1507 struct ieee80211_conf *conf,
1508 struct sta_info *sta,
1509 int index)
1510 {
1511 int ret;
1512 s8 is_green = lq_sta->is_green;
1513 struct iwl4965_scale_tbl_info *tbl =
1514 &(lq_sta->lq_info[lq_sta->active_tbl]);
1515 struct iwl4965_scale_tbl_info *search_tbl =
1516 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1517 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1518 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1519 u8 start_action = tbl->action;
1520
1521 for (;;) {
1522 lq_sta->action_counter++;
1523 switch (tbl->action) {
1524 case IWL_MIMO_SWITCH_ANTENNA_A:
1525 case IWL_MIMO_SWITCH_ANTENNA_B:
1526 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1527
1528
1529 /* Set up new search table for SISO */
1530 memcpy(search_tbl, tbl, sz);
1531 search_tbl->lq_type = LQ_SISO;
1532 search_tbl->is_SGI = 0;
1533 search_tbl->is_fat = 0;
1534 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1535 search_tbl->antenna_type = ANT_MAIN;
1536 else
1537 search_tbl->antenna_type = ANT_AUX;
1538
1539 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1540 search_tbl, index);
1541 if (!ret) {
1542 lq_sta->search_better_tbl = 1;
1543 goto out;
1544 }
1545 break;
1546
1547 case IWL_MIMO_SWITCH_GI:
1548 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1549
1550 /* Set up new search table for MIMO */
1551 memcpy(search_tbl, tbl, sz);
1552 search_tbl->lq_type = LQ_MIMO;
1553 search_tbl->antenna_type = ANT_BOTH;
1554 search_tbl->action = 0;
1555 if (search_tbl->is_SGI)
1556 search_tbl->is_SGI = 0;
1557 else
1558 search_tbl->is_SGI = 1;
1559 lq_sta->search_better_tbl = 1;
1560
1561 /*
1562 * If active table already uses the fastest possible
1563 * modulation (dual stream with short guard interval),
1564 * and it's working well, there's no need to look
1565 * for a better type of modulation!
1566 */
1567 if ((tbl->lq_type == LQ_MIMO) &&
1568 (tbl->is_SGI)) {
1569 s32 tpt = lq_sta->last_tpt / 100;
1570 if (((!tbl->is_fat) &&
1571 (tpt >= expected_tpt_mimo20MHz[index])) ||
1572 ((tbl->is_fat) &&
1573 (tpt >= expected_tpt_mimo40MHz[index])))
1574 lq_sta->search_better_tbl = 0;
1575 }
1576 rs_get_expected_tpt_table(lq_sta, search_tbl);
1577 rs_mcs_from_tbl(&search_tbl->current_rate,
1578 search_tbl, index, is_green);
1579 goto out;
1580
1581 }
1582 tbl->action++;
1583 if (tbl->action > IWL_MIMO_SWITCH_GI)
1584 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1585
1586 if (tbl->action == start_action)
1587 break;
1588 }
1589
1590 return 0;
1591 out:
1592 tbl->action++;
1593 if (tbl->action > IWL_MIMO_SWITCH_GI)
1594 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1595 return 0;
1596
1597 }
1598
1599 /*
1600 * Check whether we should continue using same modulation mode, or
1601 * begin search for a new mode, based on:
1602 * 1) # tx successes or failures while using this mode
1603 * 2) # times calling this function
1604 * 3) elapsed time in this mode (not used, for now)
1605 */
1606 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1607 {
1608 struct iwl4965_scale_tbl_info *tbl;
1609 int i;
1610 int active_tbl;
1611 int flush_interval_passed = 0;
1612
1613 active_tbl = lq_sta->active_tbl;
1614
1615 tbl = &(lq_sta->lq_info[active_tbl]);
1616
1617 /* If we've been disallowing search, see if we should now allow it */
1618 if (lq_sta->stay_in_tbl) {
1619
1620 /* Elapsed time using current modulation mode */
1621 if (lq_sta->flush_timer)
1622 flush_interval_passed =
1623 time_after(jiffies,
1624 (unsigned long)(lq_sta->flush_timer +
1625 IWL_RATE_SCALE_FLUSH_INTVL));
1626
1627 /* For now, disable the elapsed time criterion */
1628 flush_interval_passed = 0;
1629
1630 /*
1631 * Check if we should allow search for new modulation mode.
1632 * If many frames have failed or succeeded, or we've used
1633 * this same modulation for a long time, allow search, and
1634 * reset history stats that keep track of whether we should
1635 * allow a new search. Also (below) reset all bitmaps and
1636 * stats in active history.
1637 */
1638 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1639 (lq_sta->total_success > lq_sta->max_success_limit) ||
1640 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1641 && (flush_interval_passed))) {
1642 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1643 lq_sta->total_failed,
1644 lq_sta->total_success,
1645 flush_interval_passed);
1646
1647 /* Allow search for new mode */
1648 lq_sta->stay_in_tbl = 0; /* only place reset */
1649 lq_sta->total_failed = 0;
1650 lq_sta->total_success = 0;
1651 lq_sta->flush_timer = 0;
1652
1653 /*
1654 * Else if we've used this modulation mode enough repetitions
1655 * (regardless of elapsed time or success/failure), reset
1656 * history bitmaps and rate-specific stats for all rates in
1657 * active table.
1658 */
1659 } else {
1660 lq_sta->table_count++;
1661 if (lq_sta->table_count >=
1662 lq_sta->table_count_limit) {
1663 lq_sta->table_count = 0;
1664
1665 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1666 for (i = 0; i < IWL_RATE_COUNT; i++)
1667 rs_rate_scale_clear_window(
1668 &(tbl->win[i]));
1669 }
1670 }
1671
1672 /* If transitioning to allow "search", reset all history
1673 * bitmaps and stats in active table (this will become the new
1674 * "search" table). */
1675 if (!lq_sta->stay_in_tbl) {
1676 for (i = 0; i < IWL_RATE_COUNT; i++)
1677 rs_rate_scale_clear_window(&(tbl->win[i]));
1678 }
1679 }
1680 }
1681
1682 /*
1683 * Do rate scaling and search for new modulation mode.
1684 */
1685 static void rs_rate_scale_perform(struct iwl_priv *priv,
1686 struct net_device *dev,
1687 struct ieee80211_hdr *hdr,
1688 struct sta_info *sta)
1689 {
1690 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1691 struct ieee80211_hw *hw = local_to_hw(local);
1692 struct ieee80211_conf *conf = &hw->conf;
1693 int low = IWL_RATE_INVALID;
1694 int high = IWL_RATE_INVALID;
1695 int index;
1696 int i;
1697 struct iwl4965_rate_scale_data *window = NULL;
1698 int current_tpt = IWL_INVALID_VALUE;
1699 int low_tpt = IWL_INVALID_VALUE;
1700 int high_tpt = IWL_INVALID_VALUE;
1701 u32 fail_count;
1702 s8 scale_action = 0;
1703 u16 fc, rate_mask;
1704 u8 update_lq = 0;
1705 struct iwl4965_lq_sta *lq_sta;
1706 struct iwl4965_scale_tbl_info *tbl, *tbl1;
1707 u16 rate_scale_index_msk = 0;
1708 struct iwl4965_rate mcs_rate;
1709 u8 is_green = 0;
1710 u8 active_tbl = 0;
1711 u8 done_search = 0;
1712 u16 high_low;
1713 #ifdef CONFIG_IWL4965_HT
1714 u8 tid = MAX_TID_COUNT;
1715 __le16 *qc;
1716 #endif
1717
1718 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1719
1720 fc = le16_to_cpu(hdr->frame_control);
1721 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1722 /* Send management frames and broadcast/multicast data using
1723 * lowest rate. */
1724 /* TODO: this could probably be improved.. */
1725 return;
1726 }
1727
1728 if (!sta || !sta->rate_ctrl_priv)
1729 return;
1730
1731 if (!priv->lq_mngr.lq_ready) {
1732 IWL_DEBUG_RATE("still rate scaling not ready\n");
1733 return;
1734 }
1735 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1736
1737 #ifdef CONFIG_IWL4965_HT
1738 qc = ieee80211_get_qos_ctrl(hdr);
1739 if (qc) {
1740 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1741 rs_tl_add_packet(lq_sta, tid);
1742 }
1743 #endif
1744 /*
1745 * Select rate-scale / modulation-mode table to work with in
1746 * the rest of this function: "search" if searching for better
1747 * modulation mode, or "active" if doing rate scaling within a mode.
1748 */
1749 if (!lq_sta->search_better_tbl)
1750 active_tbl = lq_sta->active_tbl;
1751 else
1752 active_tbl = 1 - lq_sta->active_tbl;
1753
1754 tbl = &(lq_sta->lq_info[active_tbl]);
1755 is_green = lq_sta->is_green;
1756
1757 /* current tx rate */
1758 index = sta->last_txrate_idx;
1759
1760 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1761 tbl->lq_type);
1762
1763 /* rates available for this association, and for modulation mode */
1764 rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
1765 &rate_mask);
1766
1767 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1768
1769 /* mask with station rate restriction */
1770 if (is_legacy(tbl->lq_type)) {
1771 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1772 /* supp_rates has no CCK bits in A mode */
1773 rate_scale_index_msk = (u16) (rate_mask &
1774 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1775 else
1776 rate_scale_index_msk = (u16) (rate_mask &
1777 lq_sta->supp_rates);
1778
1779 } else
1780 rate_scale_index_msk = rate_mask;
1781
1782 if (!rate_scale_index_msk)
1783 rate_scale_index_msk = rate_mask;
1784
1785 /* If current rate is no longer supported on current association,
1786 * or user changed preferences for rates, find a new supported rate. */
1787 if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1788 index = IWL_INVALID_VALUE;
1789 update_lq = 1;
1790
1791 /* get the highest available rate */
1792 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1793 if ((1 << i) & rate_scale_index_msk)
1794 index = i;
1795 }
1796
1797 if (index == IWL_INVALID_VALUE) {
1798 IWL_WARNING("Can not find a suitable rate\n");
1799 return;
1800 }
1801 }
1802
1803 /* Get expected throughput table and history window for current rate */
1804 if (!tbl->expected_tpt)
1805 rs_get_expected_tpt_table(lq_sta, tbl);
1806
1807 window = &(tbl->win[index]);
1808
1809 /*
1810 * If there is not enough history to calculate actual average
1811 * throughput, keep analyzing results of more tx frames, without
1812 * changing rate or mode (bypass most of the rest of this function).
1813 * Set up new rate table in uCode only if old rate is not supported
1814 * in current association (use new rate found above).
1815 */
1816 fail_count = window->counter - window->success_counter;
1817 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1818 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1819 || (tbl->expected_tpt == NULL)) {
1820 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1821 "for index %d\n",
1822 window->success_counter, window->counter, index);
1823
1824 /* Can't calculate this yet; not enough history */
1825 window->average_tpt = IWL_INVALID_VALUE;
1826
1827 /* Should we stay with this modulation mode,
1828 * or search for a new one? */
1829 rs_stay_in_table(lq_sta);
1830
1831 /* Set up new rate table in uCode, if needed */
1832 if (update_lq) {
1833 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1834 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1835 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1836 }
1837 goto out;
1838
1839 /* Else we have enough samples; calculate estimate of
1840 * actual average throughput */
1841 } else
1842 window->average_tpt = ((window->success_ratio *
1843 tbl->expected_tpt[index] + 64) / 128);
1844
1845 /* If we are searching for better modulation mode, check success. */
1846 if (lq_sta->search_better_tbl) {
1847 int success_limit = IWL_RATE_SCALE_SWITCH;
1848
1849 /* If good success, continue using the "search" mode;
1850 * no need to send new link quality command, since we're
1851 * continuing to use the setup that we've been trying. */
1852 if ((window->success_ratio > success_limit) ||
1853 (window->average_tpt > lq_sta->last_tpt)) {
1854 if (!is_legacy(tbl->lq_type)) {
1855 IWL_DEBUG_HT("LQ: we are switching to HT"
1856 " rate suc %d current tpt %d"
1857 " old tpt %d\n",
1858 window->success_ratio,
1859 window->average_tpt,
1860 lq_sta->last_tpt);
1861 lq_sta->enable_counter = 1;
1862 }
1863 /* Swap tables; "search" becomes "active" */
1864 lq_sta->active_tbl = active_tbl;
1865 current_tpt = window->average_tpt;
1866
1867 /* Else poor success; go back to mode in "active" table */
1868 } else {
1869 /* Nullify "search" table */
1870 tbl->lq_type = LQ_NONE;
1871
1872 /* Revert to "active" table */
1873 active_tbl = lq_sta->active_tbl;
1874 tbl = &(lq_sta->lq_info[active_tbl]);
1875
1876 /* Revert to "active" rate and throughput info */
1877 index = iwl4965_hwrate_to_plcp_idx(
1878 tbl->current_rate.rate_n_flags);
1879 current_tpt = lq_sta->last_tpt;
1880
1881 /* Need to set up a new rate table in uCode */
1882 update_lq = 1;
1883 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1884 }
1885
1886 /* Either way, we've made a decision; modulation mode
1887 * search is done, allow rate adjustment next time. */
1888 lq_sta->search_better_tbl = 0;
1889 done_search = 1; /* Don't switch modes below! */
1890 goto lq_update;
1891 }
1892
1893 /* (Else) not in search of better modulation mode, try for better
1894 * starting rate, while staying in this mode. */
1895 high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1896 tbl->lq_type);
1897 low = high_low & 0xff;
1898 high = (high_low >> 8) & 0xff;
1899
1900 /* Collect measured throughputs for current and adjacent rates */
1901 current_tpt = window->average_tpt;
1902 if (low != IWL_RATE_INVALID)
1903 low_tpt = tbl->win[low].average_tpt;
1904 if (high != IWL_RATE_INVALID)
1905 high_tpt = tbl->win[high].average_tpt;
1906
1907 /* Assume rate increase */
1908 scale_action = 1;
1909
1910 /* Too many failures, decrease rate */
1911 if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1912 (current_tpt == 0)) {
1913 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1914 scale_action = -1;
1915
1916 /* No throughput measured yet for adjacent rates; try increase. */
1917 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1918 (high_tpt == IWL_INVALID_VALUE))
1919 scale_action = 1;
1920
1921 /* Both adjacent throughputs are measured, but neither one has better
1922 * throughput; we're using the best rate, don't change it! */
1923 else if ((low_tpt != IWL_INVALID_VALUE) &&
1924 (high_tpt != IWL_INVALID_VALUE) &&
1925 (low_tpt < current_tpt) &&
1926 (high_tpt < current_tpt))
1927 scale_action = 0;
1928
1929 /* At least one adjacent rate's throughput is measured,
1930 * and may have better performance. */
1931 else {
1932 /* Higher adjacent rate's throughput is measured */
1933 if (high_tpt != IWL_INVALID_VALUE) {
1934 /* Higher rate has better throughput */
1935 if (high_tpt > current_tpt)
1936 scale_action = 1;
1937 else {
1938 IWL_DEBUG_RATE
1939 ("decrease rate because of high tpt\n");
1940 scale_action = -1;
1941 }
1942
1943 /* Lower adjacent rate's throughput is measured */
1944 } else if (low_tpt != IWL_INVALID_VALUE) {
1945 /* Lower rate has better throughput */
1946 if (low_tpt > current_tpt) {
1947 IWL_DEBUG_RATE
1948 ("decrease rate because of low tpt\n");
1949 scale_action = -1;
1950 } else
1951 scale_action = 1;
1952 }
1953 }
1954
1955 /* Sanity check; asked for decrease, but success rate or throughput
1956 * has been good at old rate. Don't change it. */
1957 if (scale_action == -1) {
1958 if ((low != IWL_RATE_INVALID) &&
1959 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1960 (current_tpt > (100 * tbl->expected_tpt[low]))))
1961 scale_action = 0;
1962
1963 /* Sanity check; asked for increase, but success rate has not been great
1964 * even at old rate, higher rate will be worse. Don't change it. */
1965 } else if ((scale_action == 1) &&
1966 (window->success_ratio < IWL_RATE_INCREASE_TH))
1967 scale_action = 0;
1968
1969 switch (scale_action) {
1970 case -1:
1971 /* Decrease starting rate, update uCode's rate table */
1972 if (low != IWL_RATE_INVALID) {
1973 update_lq = 1;
1974 index = low;
1975 }
1976 break;
1977 case 1:
1978 /* Increase starting rate, update uCode's rate table */
1979 if (high != IWL_RATE_INVALID) {
1980 update_lq = 1;
1981 index = high;
1982 }
1983
1984 break;
1985 case 0:
1986 /* No change */
1987 default:
1988 break;
1989 }
1990
1991 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1992 "high %d type %d\n",
1993 index, scale_action, low, high, tbl->lq_type);
1994
1995 lq_update:
1996 /* Replace uCode's rate table for the destination station. */
1997 if (update_lq) {
1998 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1999 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2000 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2001 }
2002
2003 /* Should we stay with this modulation mode, or search for a new one? */
2004 rs_stay_in_table(lq_sta);
2005
2006 /*
2007 * Search for new modulation mode if we're:
2008 * 1) Not changing rates right now
2009 * 2) Not just finishing up a search
2010 * 3) Allowing a new search
2011 */
2012 if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
2013 /* Save current throughput to compare with "search" throughput*/
2014 lq_sta->last_tpt = current_tpt;
2015
2016 /* Select a new "search" modulation mode to try.
2017 * If one is found, set up the new "search" table. */
2018 if (is_legacy(tbl->lq_type))
2019 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2020 else if (is_siso(tbl->lq_type))
2021 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2022 else
2023 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
2024
2025 /* If new "search" mode was selected, set up in uCode table */
2026 if (lq_sta->search_better_tbl) {
2027 /* Access the "search" table, clear its history. */
2028 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2029 for (i = 0; i < IWL_RATE_COUNT; i++)
2030 rs_rate_scale_clear_window(&(tbl->win[i]));
2031
2032 /* Use new "search" start rate */
2033 index = iwl4965_hwrate_to_plcp_idx(
2034 tbl->current_rate.rate_n_flags);
2035
2036 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
2037 tbl->current_rate.rate_n_flags, index);
2038 rs_fill_link_cmd(lq_sta, &tbl->current_rate,
2039 &lq_sta->lq);
2040 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2041 }
2042
2043 /* If the "active" (non-search) mode was legacy,
2044 * and we've tried switching antennas,
2045 * but we haven't been able to try HT modes (not available),
2046 * stay with best antenna legacy modulation for a while
2047 * before next round of mode comparisons. */
2048 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2049 if (is_legacy(tbl1->lq_type) &&
2050 #ifdef CONFIG_IWL4965_HT
2051 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2052 #endif
2053 (lq_sta->action_counter >= 1)) {
2054 lq_sta->action_counter = 0;
2055 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
2056 rs_set_stay_in_table(1, lq_sta);
2057 }
2058
2059 /* If we're in an HT mode, and all 3 mode switch actions
2060 * have been tried and compared, stay in this best modulation
2061 * mode for a while before next round of mode comparisons. */
2062 if (lq_sta->enable_counter &&
2063 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2064 #ifdef CONFIG_IWL4965_HT
2065 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2066 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2067 (tid != MAX_TID_COUNT)) {
2068 IWL_DEBUG_HT("try to aggregate tid %d\n", tid);
2069 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2070 }
2071 #endif /*CONFIG_IWL4965_HT */
2072 lq_sta->action_counter = 0;
2073 rs_set_stay_in_table(0, lq_sta);
2074 }
2075
2076 /*
2077 * Else, don't search for a new modulation mode.
2078 * Put new timestamp in stay-in-modulation-mode flush timer if:
2079 * 1) Not changing rates right now
2080 * 2) Not just finishing up a search
2081 * 3) flush timer is empty
2082 */
2083 } else {
2084 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2085 lq_sta->flush_timer = jiffies;
2086 }
2087
2088 out:
2089 rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
2090 i = index;
2091 sta->last_txrate_idx = i;
2092
2093 /* sta->txrate_idx is an index to A mode rates which start
2094 * at IWL_FIRST_OFDM_RATE
2095 */
2096 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2097 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2098 else
2099 sta->txrate_idx = i;
2100
2101 return;
2102 }
2103
2104
2105 static void rs_initialize_lq(struct iwl_priv *priv,
2106 struct ieee80211_conf *conf,
2107 struct sta_info *sta)
2108 {
2109 int i;
2110 struct iwl4965_lq_sta *lq_sta;
2111 struct iwl4965_scale_tbl_info *tbl;
2112 u8 active_tbl = 0;
2113 int rate_idx;
2114 u8 use_green = rs_use_green(priv, conf);
2115 struct iwl4965_rate mcs_rate;
2116
2117 if (!sta || !sta->rate_ctrl_priv)
2118 goto out;
2119
2120 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2121 i = sta->last_txrate_idx;
2122
2123 if ((lq_sta->lq.sta_id == 0xff) &&
2124 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2125 goto out;
2126
2127 if (!lq_sta->search_better_tbl)
2128 active_tbl = lq_sta->active_tbl;
2129 else
2130 active_tbl = 1 - lq_sta->active_tbl;
2131
2132 tbl = &(lq_sta->lq_info[active_tbl]);
2133
2134 if ((i < 0) || (i >= IWL_RATE_COUNT))
2135 i = 0;
2136
2137 mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
2138 mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
2139 mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
2140
2141 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2142 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
2143
2144 tbl->antenna_type = ANT_AUX;
2145 rs_get_tbl_info_from_mcs(&mcs_rate, priv->band, tbl, &rate_idx);
2146 if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
2147 rs_toggle_antenna(&mcs_rate, tbl);
2148
2149 rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
2150 tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
2151 rs_get_expected_tpt_table(lq_sta, tbl);
2152 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2153 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2154 out:
2155 return;
2156 }
2157
2158 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2159 struct ieee80211_supported_band *sband,
2160 struct sk_buff *skb,
2161 struct rate_selection *sel)
2162 {
2163
2164 int i;
2165 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2166 struct ieee80211_conf *conf = &local->hw.conf;
2167 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2168 struct sta_info *sta;
2169 u16 fc;
2170 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2171 struct iwl4965_lq_sta *lq_sta;
2172
2173 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2174
2175 rcu_read_lock();
2176
2177 sta = sta_info_get(local, hdr->addr1);
2178
2179 /* Send management frames and broadcast/multicast data using lowest
2180 * rate. */
2181 fc = le16_to_cpu(hdr->frame_control);
2182 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2183 !sta || !sta->rate_ctrl_priv) {
2184 sel->rate = rate_lowest(local, sband, sta);
2185 goto out;
2186 }
2187
2188 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2189 i = sta->last_txrate_idx;
2190
2191 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2192 !lq_sta->ibss_sta_added) {
2193 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2194 DECLARE_MAC_BUF(mac);
2195
2196 if (sta_id == IWL_INVALID_STATION) {
2197 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2198 print_mac(mac, hdr->addr1));
2199 sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2200 0, CMD_ASYNC, NULL);
2201 }
2202 if ((sta_id != IWL_INVALID_STATION)) {
2203 lq_sta->lq.sta_id = sta_id;
2204 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2205 lq_sta->ibss_sta_added = 1;
2206 rs_initialize_lq(priv, conf, sta);
2207 }
2208 if (!lq_sta->ibss_sta_added)
2209 goto done;
2210 }
2211
2212 done:
2213 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2214 sel->rate = rate_lowest(local, sband, sta);
2215 goto out;
2216 }
2217
2218 sel->rate = &priv->ieee_rates[i];
2219 out:
2220 rcu_read_unlock();
2221 }
2222
2223 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2224 {
2225 struct iwl4965_lq_sta *lq_sta;
2226 int i, j;
2227
2228 IWL_DEBUG_RATE("create station rate scale window\n");
2229
2230 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2231
2232 if (lq_sta == NULL)
2233 return NULL;
2234 lq_sta->lq.sta_id = 0xff;
2235
2236
2237 for (j = 0; j < LQ_SIZE; j++)
2238 for (i = 0; i < IWL_RATE_COUNT; i++)
2239 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2240
2241 return lq_sta;
2242 }
2243
2244 static void rs_rate_init(void *priv_rate, void *priv_sta,
2245 struct ieee80211_local *local,
2246 struct sta_info *sta)
2247 {
2248 int i, j;
2249 struct ieee80211_conf *conf = &local->hw.conf;
2250 struct ieee80211_supported_band *sband;
2251 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2252 struct iwl4965_lq_sta *lq_sta = priv_sta;
2253
2254 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2255
2256 lq_sta->flush_timer = 0;
2257 lq_sta->supp_rates = sta->supp_rates[sband->band];
2258 sta->txrate_idx = 3;
2259 for (j = 0; j < LQ_SIZE; j++)
2260 for (i = 0; i < IWL_RATE_COUNT; i++)
2261 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2262
2263 IWL_DEBUG_RATE("rate scale global init\n");
2264 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2265 * the lowest or the highest rate.. Could consider using RSSI from
2266 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2267 * after assoc.. */
2268
2269 lq_sta->ibss_sta_added = 0;
2270 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2271 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2272 DECLARE_MAC_BUF(mac);
2273
2274 /* for IBSS the call are from tasklet */
2275 IWL_DEBUG_HT("LQ: ADD station %s\n",
2276 print_mac(mac, sta->addr));
2277
2278 if (sta_id == IWL_INVALID_STATION) {
2279 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2280 print_mac(mac, sta->addr));
2281 sta_id = iwl4965_add_station_flags(priv, sta->addr,
2282 0, CMD_ASYNC, NULL);
2283 }
2284 if ((sta_id != IWL_INVALID_STATION)) {
2285 lq_sta->lq.sta_id = sta_id;
2286 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2287 }
2288 /* FIXME: this is w/a remove it later */
2289 priv->assoc_station_added = 1;
2290 }
2291
2292 /* Find highest tx rate supported by hardware and destination station */
2293 for (i = 0; i < sband->n_bitrates; i++)
2294 if (sta->supp_rates[sband->band] & BIT(i))
2295 sta->txrate_idx = i;
2296
2297 sta->last_txrate_idx = sta->txrate_idx;
2298 /* WTF is with this bogus comment? A doesn't have cck rates */
2299 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2300 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2301 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2302
2303 lq_sta->is_dup = 0;
2304 lq_sta->valid_antenna = priv->valid_antenna;
2305 lq_sta->antenna = priv->antenna;
2306 lq_sta->is_green = rs_use_green(priv, conf);
2307 lq_sta->active_rate = priv->active_rate;
2308 lq_sta->active_rate &= ~(0x1000);
2309 lq_sta->active_rate_basic = priv->active_rate_basic;
2310 lq_sta->band = priv->band;
2311 #ifdef CONFIG_IWL4965_HT
2312 /*
2313 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2314 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2315 */
2316 lq_sta->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1);
2317 lq_sta->active_siso_rate |=
2318 (priv->current_ht_config.supp_mcs_set[0] & 0x1);
2319 lq_sta->active_siso_rate &= ~((u16)0x2);
2320 lq_sta->active_siso_rate =
2321 lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE;
2322
2323 /* Same here */
2324 lq_sta->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1);
2325 lq_sta->active_mimo_rate |=
2326 (priv->current_ht_config.supp_mcs_set[1] & 0x1);
2327 lq_sta->active_mimo_rate &= ~((u16)0x2);
2328 lq_sta->active_mimo_rate =
2329 lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2330 IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2331 lq_sta->active_siso_rate,
2332 lq_sta->active_mimo_rate);
2333 /* as default allow aggregation for all tids */
2334 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2335 #endif /*CONFIG_IWL4965_HT*/
2336 #ifdef CONFIG_MAC80211_DEBUGFS
2337 lq_sta->drv = priv;
2338 #endif
2339
2340 if (priv->assoc_station_added)
2341 priv->lq_mngr.lq_ready = 1;
2342
2343 rs_initialize_lq(priv, conf, sta);
2344 }
2345
2346 static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
2347 struct iwl4965_rate *tx_mcs,
2348 struct iwl_link_quality_cmd *lq_cmd)
2349 {
2350 int index = 0;
2351 int rate_idx;
2352 int repeat_rate = 0;
2353 u8 ant_toggle_count = 0;
2354 u8 use_ht_possible = 1;
2355 struct iwl4965_rate new_rate;
2356 struct iwl4965_scale_tbl_info tbl_type = { 0 };
2357
2358 /* Override starting rate (index 0) if needed for debug purposes */
2359 rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
2360
2361 /* Interpret rate_n_flags */
2362 rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->band,
2363 &tbl_type, &rate_idx);
2364
2365 /* How many times should we repeat the initial rate? */
2366 if (is_legacy(tbl_type.lq_type)) {
2367 ant_toggle_count = 1;
2368 repeat_rate = IWL_NUMBER_TRY;
2369 } else
2370 repeat_rate = IWL_HT_NUMBER_TRY;
2371
2372 lq_cmd->general_params.mimo_delimiter =
2373 is_mimo(tbl_type.lq_type) ? 1 : 0;
2374
2375 /* Fill 1st table entry (index 0) */
2376 lq_cmd->rs_table[index].rate_n_flags =
2377 cpu_to_le32(tx_mcs->rate_n_flags);
2378 new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2379
2380 if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2381 lq_cmd->general_params.single_stream_ant_msk
2382 = LINK_QUAL_ANT_A_MSK;
2383 else
2384 lq_cmd->general_params.single_stream_ant_msk
2385 = LINK_QUAL_ANT_B_MSK;
2386
2387 index++;
2388 repeat_rate--;
2389
2390 /* Fill rest of rate table */
2391 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2392 /* Repeat initial/next rate.
2393 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2394 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2395 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2396 if (is_legacy(tbl_type.lq_type)) {
2397 if (ant_toggle_count <
2398 NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2399 ant_toggle_count++;
2400 else {
2401 rs_toggle_antenna(&new_rate, &tbl_type);
2402 ant_toggle_count = 1;
2403 }
2404 }
2405
2406 /* Override next rate if needed for debug purposes */
2407 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2408
2409 /* Fill next table entry */
2410 lq_cmd->rs_table[index].rate_n_flags =
2411 cpu_to_le32(new_rate.rate_n_flags);
2412 repeat_rate--;
2413 index++;
2414 }
2415
2416 rs_get_tbl_info_from_mcs(&new_rate, lq_sta->band, &tbl_type,
2417 &rate_idx);
2418
2419 /* Indicate to uCode which entries might be MIMO.
2420 * If initial rate was MIMO, this will finally end up
2421 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2422 if (is_mimo(tbl_type.lq_type))
2423 lq_cmd->general_params.mimo_delimiter = index;
2424
2425 /* Get next rate */
2426 rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2427 use_ht_possible, &new_rate);
2428
2429 /* How many times should we repeat the next rate? */
2430 if (is_legacy(tbl_type.lq_type)) {
2431 if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2432 ant_toggle_count++;
2433 else {
2434 rs_toggle_antenna(&new_rate, &tbl_type);
2435 ant_toggle_count = 1;
2436 }
2437 repeat_rate = IWL_NUMBER_TRY;
2438 } else
2439 repeat_rate = IWL_HT_NUMBER_TRY;
2440
2441 /* Don't allow HT rates after next pass.
2442 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2443 use_ht_possible = 0;
2444
2445 /* Override next rate if needed for debug purposes */
2446 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2447
2448 /* Fill next table entry */
2449 lq_cmd->rs_table[index].rate_n_flags =
2450 cpu_to_le32(new_rate.rate_n_flags);
2451
2452 index++;
2453 repeat_rate--;
2454 }
2455
2456 lq_cmd->general_params.dual_stream_ant_msk = 3;
2457 lq_cmd->agg_params.agg_dis_start_th = 3;
2458 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2459 }
2460
2461 static void *rs_alloc(struct ieee80211_local *local)
2462 {
2463 return local->hw.priv;
2464 }
2465 /* rate scale requires free function to be implemented */
2466 static void rs_free(void *priv_rate)
2467 {
2468 return;
2469 }
2470
2471 static void rs_clear(void *priv_rate)
2472 {
2473 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2474
2475 IWL_DEBUG_RATE("enter\n");
2476
2477 priv->lq_mngr.lq_ready = 0;
2478
2479 IWL_DEBUG_RATE("leave\n");
2480 }
2481
2482 static void rs_free_sta(void *priv, void *priv_sta)
2483 {
2484 struct iwl4965_lq_sta *lq_sta = priv_sta;
2485
2486 IWL_DEBUG_RATE("enter\n");
2487 kfree(lq_sta);
2488 IWL_DEBUG_RATE("leave\n");
2489 }
2490
2491
2492 #ifdef CONFIG_MAC80211_DEBUGFS
2493 static int open_file_generic(struct inode *inode, struct file *file)
2494 {
2495 file->private_data = inode->i_private;
2496 return 0;
2497 }
2498 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2499 struct iwl4965_rate *mcs, int index)
2500 {
2501 u32 base_rate;
2502
2503 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2504 base_rate = 0x800D;
2505 else
2506 base_rate = 0x820A;
2507
2508 if (lq_sta->dbg_fixed.rate_n_flags) {
2509 if (index < 12)
2510 mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
2511 else
2512 mcs->rate_n_flags = base_rate;
2513 IWL_DEBUG_RATE("Fixed rate ON\n");
2514 return;
2515 }
2516
2517 IWL_DEBUG_RATE("Fixed rate OFF\n");
2518 }
2519
2520 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2521 const char __user *user_buf, size_t count, loff_t *ppos)
2522 {
2523 struct iwl4965_lq_sta *lq_sta = file->private_data;
2524 char buf[64];
2525 int buf_size;
2526 u32 parsed_rate;
2527
2528 memset(buf, 0, sizeof(buf));
2529 buf_size = min(count, sizeof(buf) - 1);
2530 if (copy_from_user(buf, user_buf, buf_size))
2531 return -EFAULT;
2532
2533 if (sscanf(buf, "%x", &parsed_rate) == 1)
2534 lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
2535 else
2536 lq_sta->dbg_fixed.rate_n_flags = 0;
2537
2538 lq_sta->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2539 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2540 lq_sta->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2541
2542 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2543 lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
2544
2545 if (lq_sta->dbg_fixed.rate_n_flags) {
2546 rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
2547 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2548 }
2549
2550 return count;
2551 }
2552
2553 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2554 char __user *user_buf, size_t count, loff_t *ppos)
2555 {
2556 char buff[1024];
2557 int desc = 0;
2558 int i = 0;
2559
2560 struct iwl4965_lq_sta *lq_sta = file->private_data;
2561
2562 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2563 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2564 lq_sta->total_failed, lq_sta->total_success,
2565 lq_sta->active_rate);
2566 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2567 lq_sta->dbg_fixed.rate_n_flags);
2568 desc += sprintf(buff+desc, "general:"
2569 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2570 lq_sta->lq.general_params.flags,
2571 lq_sta->lq.general_params.mimo_delimiter,
2572 lq_sta->lq.general_params.single_stream_ant_msk,
2573 lq_sta->lq.general_params.dual_stream_ant_msk);
2574
2575 desc += sprintf(buff+desc, "agg:"
2576 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2577 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2578 lq_sta->lq.agg_params.agg_dis_start_th,
2579 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2580
2581 desc += sprintf(buff+desc,
2582 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2583 lq_sta->lq.general_params.start_rate_index[0],
2584 lq_sta->lq.general_params.start_rate_index[1],
2585 lq_sta->lq.general_params.start_rate_index[2],
2586 lq_sta->lq.general_params.start_rate_index[3]);
2587
2588
2589 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2590 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2591 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2592
2593 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2594 }
2595
2596 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2597 .write = rs_sta_dbgfs_scale_table_write,
2598 .read = rs_sta_dbgfs_scale_table_read,
2599 .open = open_file_generic,
2600 };
2601 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2602 char __user *user_buf, size_t count, loff_t *ppos)
2603 {
2604 char buff[1024];
2605 int desc = 0;
2606 int i, j;
2607
2608 struct iwl4965_lq_sta *lq_sta = file->private_data;
2609 for (i = 0; i < LQ_SIZE; i++) {
2610 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2611 "rate=0x%X\n",
2612 lq_sta->active_tbl == i?"*":"x",
2613 lq_sta->lq_info[i].lq_type,
2614 lq_sta->lq_info[i].is_SGI,
2615 lq_sta->lq_info[i].is_fat,
2616 lq_sta->lq_info[i].is_dup,
2617 lq_sta->lq_info[i].current_rate.rate_n_flags);
2618 for (j = 0; j < IWL_RATE_COUNT; j++) {
2619 desc += sprintf(buff+desc,
2620 "counter=%d success=%d %%=%d\n",
2621 lq_sta->lq_info[i].win[j].counter,
2622 lq_sta->lq_info[i].win[j].success_counter,
2623 lq_sta->lq_info[i].win[j].success_ratio);
2624 }
2625 }
2626 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2627 }
2628
2629 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2630 .read = rs_sta_dbgfs_stats_table_read,
2631 .open = open_file_generic,
2632 };
2633
2634 static void rs_add_debugfs(void *priv, void *priv_sta,
2635 struct dentry *dir)
2636 {
2637 struct iwl4965_lq_sta *lq_sta = priv_sta;
2638 lq_sta->rs_sta_dbgfs_scale_table_file =
2639 debugfs_create_file("rate_scale_table", 0600, dir,
2640 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2641 lq_sta->rs_sta_dbgfs_stats_table_file =
2642 debugfs_create_file("rate_stats_table", 0600, dir,
2643 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2644 #ifdef CONFIG_IWL4965_HT
2645 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2646 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2647 &lq_sta->tx_agg_tid_en);
2648 #endif
2649
2650 }
2651
2652 static void rs_remove_debugfs(void *priv, void *priv_sta)
2653 {
2654 struct iwl4965_lq_sta *lq_sta = priv_sta;
2655 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2656 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2657 #ifdef CONFIG_IWL4965_HT
2658 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2659 #endif
2660 }
2661 #endif
2662
2663 static struct rate_control_ops rs_ops = {
2664 .module = NULL,
2665 .name = RS_NAME,
2666 .tx_status = rs_tx_status,
2667 .get_rate = rs_get_rate,
2668 .rate_init = rs_rate_init,
2669 .clear = rs_clear,
2670 .alloc = rs_alloc,
2671 .free = rs_free,
2672 .alloc_sta = rs_alloc_sta,
2673 .free_sta = rs_free_sta,
2674 #ifdef CONFIG_MAC80211_DEBUGFS
2675 .add_sta_debugfs = rs_add_debugfs,
2676 .remove_sta_debugfs = rs_remove_debugfs,
2677 #endif
2678 };
2679
2680 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2681 {
2682 struct ieee80211_local *local = hw_to_local(hw);
2683 struct iwl_priv *priv = hw->priv;
2684 struct iwl4965_lq_sta *lq_sta;
2685 struct sta_info *sta;
2686 int cnt = 0, i;
2687 u32 samples = 0, success = 0, good = 0;
2688 unsigned long now = jiffies;
2689 u32 max_time = 0;
2690 u8 lq_type, antenna;
2691
2692 rcu_read_lock();
2693
2694 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2695 if (!sta || !sta->rate_ctrl_priv) {
2696 if (sta)
2697 IWL_DEBUG_RATE("leave - no private rate data!\n");
2698 else
2699 IWL_DEBUG_RATE("leave - no station!\n");
2700 rcu_read_unlock();
2701 return sprintf(buf, "station %d not found\n", sta_id);
2702 }
2703
2704 lq_sta = (void *)sta->rate_ctrl_priv;
2705
2706 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2707 antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type;
2708
2709 if (is_legacy(lq_type))
2710 i = IWL_RATE_54M_INDEX;
2711 else
2712 i = IWL_RATE_60M_INDEX;
2713 while (1) {
2714 u64 mask;
2715 int j;
2716 int active = lq_sta->active_tbl;
2717
2718 cnt +=
2719 sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2720
2721 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2722 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2723 buf[cnt++] =
2724 (lq_sta->lq_info[active].win[i].data & mask)
2725 ? '1' : '0';
2726
2727 samples += lq_sta->lq_info[active].win[i].counter;
2728 good += lq_sta->lq_info[active].win[i].success_counter;
2729 success += lq_sta->lq_info[active].win[i].success_counter *
2730 iwl4965_rates[i].ieee;
2731
2732 if (lq_sta->lq_info[active].win[i].stamp) {
2733 int delta =
2734 jiffies_to_msecs(now -
2735 lq_sta->lq_info[active].win[i].stamp);
2736
2737 if (delta > max_time)
2738 max_time = delta;
2739
2740 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2741 } else
2742 buf[cnt++] = '\n';
2743
2744 j = iwl4965_get_prev_ieee_rate(i);
2745 if (j == i)
2746 break;
2747 i = j;
2748 }
2749
2750 /* Display the average rate of all samples taken.
2751 *
2752 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2753 * added from iwl4965_rates is actually 2X the rate */
2754 if (samples)
2755 cnt += sprintf(&buf[cnt],
2756 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2757 "%3d%% success (%d good packets over %d tries)\n",
2758 success / (2 * samples), (success * 5 / samples) % 10,
2759 max_time, good * 100 / samples, good, samples);
2760 else
2761 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2762
2763 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2764 "active_search %d rate index %d\n", lq_type, antenna,
2765 lq_sta->search_better_tbl, sta->last_txrate_idx);
2766
2767 rcu_read_unlock();
2768 return cnt;
2769 }
2770
2771 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2772 {
2773 struct iwl_priv *priv = hw->priv;
2774
2775 priv->lq_mngr.lq_ready = 1;
2776 }
2777
2778 int iwl4965_rate_control_register(void)
2779 {
2780 return ieee80211_rate_control_register(&rs_ops);
2781 }
2782
2783 void iwl4965_rate_control_unregister(void)
2784 {
2785 ieee80211_rate_control_unregister(&rs_ops);
2786 }
2787
Linux kernel - Deliverables
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