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iwlwifi: update copyright year to 2009
[linux-2.6/verdex.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
bloba82cce5fbff815158137ce1896ae65f014be2da5
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "iwl-dev.h"
39 #include "iwl-sta.h"
40 #include "iwl-core.h"
41
42 #define RS_NAME "iwl-agn-rs"
43
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
47
48 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
51
52 /* max time to accum history 2 seconds */
53 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
54
55 static u8 rs_ht_to_legacy[] = {
56 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
60 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
61 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
62 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
63 };
64
65 static const u8 ant_toggle_lookup[] = {
66 /*ANT_NONE -> */ ANT_NONE,
67 /*ANT_A -> */ ANT_B,
68 /*ANT_B -> */ ANT_C,
69 /*ANT_AB -> */ ANT_BC,
70 /*ANT_C -> */ ANT_A,
71 /*ANT_AC -> */ ANT_AB,
72 /*ANT_BC -> */ ANT_AC,
73 /*ANT_ABC -> */ ANT_ABC,
74 };
75
76 /**
77 * struct iwl_rate_scale_data -- tx success history for one rate
78 */
79 struct iwl_rate_scale_data {
80 u64 data; /* bitmap of successful frames */
81 s32 success_counter; /* number of frames successful */
82 s32 success_ratio; /* per-cent * 128 */
83 s32 counter; /* number of frames attempted */
84 s32 average_tpt; /* success ratio * expected throughput */
85 unsigned long stamp;
86 };
87
88 /**
89 * struct iwl_scale_tbl_info -- tx params and success history for all rates
90 *
91 * There are two of these in struct iwl_lq_sta,
92 * one for "active", and one for "search".
93 */
94 struct iwl_scale_tbl_info {
95 enum iwl_table_type lq_type;
96 u8 ant_type;
97 u8 is_SGI; /* 1 = short guard interval */
98 u8 is_fat; /* 1 = 40 MHz channel width */
99 u8 is_dup; /* 1 = duplicated data streams */
100 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
101 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
102 u32 current_rate; /* rate_n_flags, uCode API format */
103 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
104 };
105
106 struct iwl_traffic_load {
107 unsigned long time_stamp; /* age of the oldest statistics */
108 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
109 * slice */
110 u32 total; /* total num of packets during the
111 * last TID_MAX_TIME_DIFF */
112 u8 queue_count; /* number of queues that has
113 * been used since the last cleanup */
114 u8 head; /* start of the circular buffer */
115 };
116
117 /**
118 * struct iwl_lq_sta -- driver's rate scaling private structure
119 *
120 * Pointer to this gets passed back and forth between driver and mac80211.
121 */
122 struct iwl_lq_sta {
123 u8 active_tbl; /* index of active table, range 0-1 */
124 u8 enable_counter; /* indicates HT mode */
125 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
126 u8 search_better_tbl; /* 1: currently trying alternate mode */
127 s32 last_tpt;
128
129 /* The following determine when to search for a new mode */
130 u32 table_count_limit;
131 u32 max_failure_limit; /* # failed frames before new search */
132 u32 max_success_limit; /* # successful frames before new search */
133 u32 table_count;
134 u32 total_failed; /* total failed frames, any/all rates */
135 u32 total_success; /* total successful frames, any/all rates */
136 u32 flush_timer; /* time staying in mode before new search */
137
138 u8 action_counter; /* # mode-switch actions tried */
139 u8 is_green;
140 u8 is_dup;
141 enum ieee80211_band band;
142 u8 ibss_sta_added;
143
144 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
145 u32 supp_rates;
146 u16 active_legacy_rate;
147 u16 active_siso_rate;
148 u16 active_mimo2_rate;
149 u16 active_mimo3_rate;
150 u16 active_rate_basic;
151
152 struct iwl_link_quality_cmd lq;
153 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
154 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
155 u8 tx_agg_tid_en;
156 #ifdef CONFIG_MAC80211_DEBUGFS
157 struct dentry *rs_sta_dbgfs_scale_table_file;
158 struct dentry *rs_sta_dbgfs_stats_table_file;
159 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
160 u32 dbg_fixed_rate;
161 #endif
162 struct iwl_priv *drv;
163
164 /* used to be in sta_info */
165 int last_txrate_idx;
166 };
167
168 static void rs_rate_scale_perform(struct iwl_priv *priv,
169 struct ieee80211_hdr *hdr,
170 struct ieee80211_sta *sta,
171 struct iwl_lq_sta *lq_sta);
172 static void rs_fill_link_cmd(const struct iwl_priv *priv,
173 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
174
175
176 #ifdef CONFIG_MAC80211_DEBUGFS
177 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
178 u32 *rate_n_flags, int index);
179 #else
180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
181 u32 *rate_n_flags, int index)
182 {}
183 #endif
184
185 /*
186 * Expected throughput metrics for following rates:
187 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
188 * "G" is the only table that supports CCK (the first 4 rates).
189 */
190 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
192 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
193 };
194
195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
196 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
197 };
198
199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
201 };
202
203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
204 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
205 };
206
207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
209 };
210
211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
213 };
214
215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
216 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
217 };
218
219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
220 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
221 };
222
223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
225 };
226
227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
229 };
230
231 static inline u8 rs_extract_rate(u32 rate_n_flags)
232 {
233 return (u8)(rate_n_flags & 0xFF);
234 }
235
236 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
237 {
238 window->data = 0;
239 window->success_counter = 0;
240 window->success_ratio = IWL_INVALID_VALUE;
241 window->counter = 0;
242 window->average_tpt = IWL_INVALID_VALUE;
243 window->stamp = 0;
244 }
245
246 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
247 {
248 return (ant_type & valid_antenna) == ant_type;
249 }
250
251 /*
252 * removes the old data from the statistics. All data that is older than
253 * TID_MAX_TIME_DIFF, will be deleted.
254 */
255 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
256 {
257 /* The oldest age we want to keep */
258 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
259
260 while (tl->queue_count &&
261 (tl->time_stamp < oldest_time)) {
262 tl->total -= tl->packet_count[tl->head];
263 tl->packet_count[tl->head] = 0;
264 tl->time_stamp += TID_QUEUE_CELL_SPACING;
265 tl->queue_count--;
266 tl->head++;
267 if (tl->head >= TID_QUEUE_MAX_SIZE)
268 tl->head = 0;
269 }
270 }
271
272 /*
273 * increment traffic load value for tid and also remove
274 * any old values if passed the certain time period
275 */
276 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
277 struct ieee80211_hdr *hdr)
278 {
279 u32 curr_time = jiffies_to_msecs(jiffies);
280 u32 time_diff;
281 s32 index;
282 struct iwl_traffic_load *tl = NULL;
283 u8 tid;
284
285 if (ieee80211_is_data_qos(hdr->frame_control)) {
286 u8 *qc = ieee80211_get_qos_ctl(hdr);
287 tid = qc[0] & 0xf;
288 } else
289 return MAX_TID_COUNT;
290
291 tl = &lq_data->load[tid];
292
293 curr_time -= curr_time % TID_ROUND_VALUE;
294
295 /* Happens only for the first packet. Initialize the data */
296 if (!(tl->queue_count)) {
297 tl->total = 1;
298 tl->time_stamp = curr_time;
299 tl->queue_count = 1;
300 tl->head = 0;
301 tl->packet_count[0] = 1;
302 return MAX_TID_COUNT;
303 }
304
305 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
306 index = time_diff / TID_QUEUE_CELL_SPACING;
307
308 /* The history is too long: remove data that is older than */
309 /* TID_MAX_TIME_DIFF */
310 if (index >= TID_QUEUE_MAX_SIZE)
311 rs_tl_rm_old_stats(tl, curr_time);
312
313 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
314 tl->packet_count[index] = tl->packet_count[index] + 1;
315 tl->total = tl->total + 1;
316
317 if ((index + 1) > tl->queue_count)
318 tl->queue_count = index + 1;
319
320 return tid;
321 }
322
323 /*
324 get the traffic load value for tid
325 */
326 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
327 {
328 u32 curr_time = jiffies_to_msecs(jiffies);
329 u32 time_diff;
330 s32 index;
331 struct iwl_traffic_load *tl = NULL;
332
333 if (tid >= TID_MAX_LOAD_COUNT)
334 return 0;
335
336 tl = &(lq_data->load[tid]);
337
338 curr_time -= curr_time % TID_ROUND_VALUE;
339
340 if (!(tl->queue_count))
341 return 0;
342
343 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
344 index = time_diff / TID_QUEUE_CELL_SPACING;
345
346 /* The history is too long: remove data that is older than */
347 /* TID_MAX_TIME_DIFF */
348 if (index >= TID_QUEUE_MAX_SIZE)
349 rs_tl_rm_old_stats(tl, curr_time);
350
351 return tl->total;
352 }
353
354 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
355 struct iwl_lq_sta *lq_data, u8 tid,
356 struct ieee80211_sta *sta)
357 {
358 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
359 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
360 sta->addr, tid);
361 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
362 }
363 }
364
365 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
366 struct iwl_lq_sta *lq_data,
367 struct ieee80211_sta *sta)
368 {
369 if ((tid < TID_MAX_LOAD_COUNT))
370 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
371 else if (tid == IWL_AGG_ALL_TID)
372 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
373 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
374 }
375
376 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
377 {
378 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
379 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
380 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
381 }
382
383 /**
384 * rs_collect_tx_data - Update the success/failure sliding window
385 *
386 * We keep a sliding window of the last 62 packets transmitted
387 * at this rate. window->data contains the bitmask of successful
388 * packets.
389 */
390 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
391 int scale_index, s32 tpt, int retries,
392 int successes)
393 {
394 struct iwl_rate_scale_data *window = NULL;
395 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
396 s32 fail_count;
397
398 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
399 return -EINVAL;
400
401 /* Select data for current tx bit rate */
402 window = &(windows[scale_index]);
403
404 /*
405 * Keep track of only the latest 62 tx frame attempts in this rate's
406 * history window; anything older isn't really relevant any more.
407 * If we have filled up the sliding window, drop the oldest attempt;
408 * if the oldest attempt (highest bit in bitmap) shows "success",
409 * subtract "1" from the success counter (this is the main reason
410 * we keep these bitmaps!).
411 */
412 while (retries > 0) {
413 if (window->counter >= IWL_RATE_MAX_WINDOW) {
414
415 /* remove earliest */
416 window->counter = IWL_RATE_MAX_WINDOW - 1;
417
418 if (window->data & mask) {
419 window->data &= ~mask;
420 window->success_counter--;
421 }
422 }
423
424 /* Increment frames-attempted counter */
425 window->counter++;
426
427 /* Shift bitmap by one frame (throw away oldest history),
428 * OR in "1", and increment "success" if this
429 * frame was successful. */
430 window->data <<= 1;
431 if (successes > 0) {
432 window->success_counter++;
433 window->data |= 0x1;
434 successes--;
435 }
436
437 retries--;
438 }
439
440 /* Calculate current success ratio, avoid divide-by-0! */
441 if (window->counter > 0)
442 window->success_ratio = 128 * (100 * window->success_counter)
443 / window->counter;
444 else
445 window->success_ratio = IWL_INVALID_VALUE;
446
447 fail_count = window->counter - window->success_counter;
448
449 /* Calculate average throughput, if we have enough history. */
450 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
451 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
452 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
453 else
454 window->average_tpt = IWL_INVALID_VALUE;
455
456 /* Tag this window as having been updated */
457 window->stamp = jiffies;
458
459 return 0;
460 }
461
462 /*
463 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
464 */
465 /* FIXME:RS:remove this function and put the flags statically in the table */
466 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
467 struct iwl_scale_tbl_info *tbl,
468 int index, u8 use_green)
469 {
470 u32 rate_n_flags = 0;
471
472 if (is_legacy(tbl->lq_type)) {
473 rate_n_flags = iwl_rates[index].plcp;
474 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
475 rate_n_flags |= RATE_MCS_CCK_MSK;
476
477 } else if (is_Ht(tbl->lq_type)) {
478 if (index > IWL_LAST_OFDM_RATE) {
479 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
480 index = IWL_LAST_OFDM_RATE;
481 }
482 rate_n_flags = RATE_MCS_HT_MSK;
483
484 if (is_siso(tbl->lq_type))
485 rate_n_flags |= iwl_rates[index].plcp_siso;
486 else if (is_mimo2(tbl->lq_type))
487 rate_n_flags |= iwl_rates[index].plcp_mimo2;
488 else
489 rate_n_flags |= iwl_rates[index].plcp_mimo3;
490 } else {
491 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
492 }
493
494 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
495 RATE_MCS_ANT_ABC_MSK);
496
497 if (is_Ht(tbl->lq_type)) {
498 if (tbl->is_fat) {
499 if (tbl->is_dup)
500 rate_n_flags |= RATE_MCS_DUP_MSK;
501 else
502 rate_n_flags |= RATE_MCS_FAT_MSK;
503 }
504 if (tbl->is_SGI)
505 rate_n_flags |= RATE_MCS_SGI_MSK;
506
507 if (use_green) {
508 rate_n_flags |= RATE_MCS_GF_MSK;
509 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
510 rate_n_flags &= ~RATE_MCS_SGI_MSK;
511 IWL_ERR(priv, "GF was set with SGI:SISO\n");
512 }
513 }
514 }
515 return rate_n_flags;
516 }
517
518 /*
519 * Interpret uCode API's rate_n_flags format,
520 * fill "search" or "active" tx mode table.
521 */
522 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
523 enum ieee80211_band band,
524 struct iwl_scale_tbl_info *tbl,
525 int *rate_idx)
526 {
527 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
528 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
529 u8 mcs;
530
531 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
532
533 if (*rate_idx == IWL_RATE_INVALID) {
534 *rate_idx = -1;
535 return -EINVAL;
536 }
537 tbl->is_SGI = 0; /* default legacy setup */
538 tbl->is_fat = 0;
539 tbl->is_dup = 0;
540 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
541 tbl->lq_type = LQ_NONE;
542
543 /* legacy rate format */
544 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
545 if (num_of_ant == 1) {
546 if (band == IEEE80211_BAND_5GHZ)
547 tbl->lq_type = LQ_A;
548 else
549 tbl->lq_type = LQ_G;
550 }
551 /* HT rate format */
552 } else {
553 if (rate_n_flags & RATE_MCS_SGI_MSK)
554 tbl->is_SGI = 1;
555
556 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
557 (rate_n_flags & RATE_MCS_DUP_MSK))
558 tbl->is_fat = 1;
559
560 if (rate_n_flags & RATE_MCS_DUP_MSK)
561 tbl->is_dup = 1;
562
563 mcs = rs_extract_rate(rate_n_flags);
564
565 /* SISO */
566 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
567 if (num_of_ant == 1)
568 tbl->lq_type = LQ_SISO; /*else NONE*/
569 /* MIMO2 */
570 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
571 if (num_of_ant == 2)
572 tbl->lq_type = LQ_MIMO2;
573 /* MIMO3 */
574 } else {
575 if (num_of_ant == 3)
576 tbl->lq_type = LQ_MIMO3;
577 }
578 }
579 return 0;
580 }
581
582 /* switch to another antenna/antennas and return 1 */
583 /* if no other valid antenna found, return 0 */
584 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
585 struct iwl_scale_tbl_info *tbl)
586 {
587 u8 new_ant_type;
588
589 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
590 return 0;
591
592 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
593 return 0;
594
595 new_ant_type = ant_toggle_lookup[tbl->ant_type];
596
597 while ((new_ant_type != tbl->ant_type) &&
598 !rs_is_valid_ant(valid_ant, new_ant_type))
599 new_ant_type = ant_toggle_lookup[new_ant_type];
600
601 if (new_ant_type == tbl->ant_type)
602 return 0;
603
604 tbl->ant_type = new_ant_type;
605 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
606 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
607 return 1;
608 }
609
610 /* FIXME:RS: in 4965 we don't use greenfield at all */
611 /* FIXME:RS: don't use greenfield for now in TX */
612 #if 0
613 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
614 {
615 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
616 priv->current_ht_config.is_green_field &&
617 !priv->current_ht_config.non_GF_STA_present;
618 }
619 #endif
620 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
621 {
622 return 0;
623 }
624
625 /**
626 * rs_get_supported_rates - get the available rates
627 *
628 * if management frame or broadcast frame only return
629 * basic available rates.
630 *
631 */
632 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
633 struct ieee80211_hdr *hdr,
634 enum iwl_table_type rate_type)
635 {
636 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
637 lq_sta->active_rate_basic)
638 return lq_sta->active_rate_basic;
639
640 if (is_legacy(rate_type)) {
641 return lq_sta->active_legacy_rate;
642 } else {
643 if (is_siso(rate_type))
644 return lq_sta->active_siso_rate;
645 else if (is_mimo2(rate_type))
646 return lq_sta->active_mimo2_rate;
647 else
648 return lq_sta->active_mimo3_rate;
649 }
650 }
651
652 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
653 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 = iwl_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 = iwl_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 u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
709 struct iwl_scale_tbl_info *tbl,
710 u8 scale_index, u8 ht_possible)
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 (num_of_ant(tbl->ant_type) > 1)
730 tbl->ant_type = ANT_A;/*FIXME:RS*/
731
732 tbl->is_fat = 0;
733 tbl->is_SGI = 0;
734 }
735
736 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
737
738 /* Mask with station rate restriction */
739 if (is_legacy(tbl->lq_type)) {
740 /* supp_rates has no CCK bits in A mode */
741 if (lq_sta->band == IEEE80211_BAND_5GHZ)
742 rate_mask = (u16)(rate_mask &
743 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
744 else
745 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
746 }
747
748 /* If we switched from HT to legacy, check current rate */
749 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
750 low = scale_index;
751 goto out;
752 }
753
754 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
755 tbl->lq_type);
756 low = high_low & 0xff;
757
758 if (low == IWL_RATE_INVALID)
759 low = scale_index;
760
761 out:
762 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
763 }
764
765 /*
766 * mac80211 sends us Tx status
767 */
768 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
769 struct ieee80211_sta *sta, void *priv_sta,
770 struct sk_buff *skb)
771 {
772 int status;
773 u8 retries;
774 int rs_index, index = 0;
775 struct iwl_lq_sta *lq_sta = priv_sta;
776 struct iwl_link_quality_cmd *table;
777 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
778 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
779 struct ieee80211_hw *hw = priv->hw;
780 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
781 struct iwl_rate_scale_data *window = NULL;
782 struct iwl_rate_scale_data *search_win = NULL;
783 u32 tx_rate;
784 struct iwl_scale_tbl_info tbl_type;
785 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
786 u8 active_index = 0;
787 s32 tpt = 0;
788
789 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
790
791 if (!ieee80211_is_data(hdr->frame_control) ||
792 is_multicast_ether_addr(hdr->addr1))
793 return;
794
795 /* This packet was aggregated but doesn't carry rate scale info */
796 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
797 !(info->flags & IEEE80211_TX_STAT_AMPDU))
798 return;
799
800 retries = info->status.rates[0].count - 1;
801
802 if (retries > 15)
803 retries = 15;
804
805 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
806 !lq_sta->ibss_sta_added)
807 goto out;
808
809 table = &lq_sta->lq;
810 active_index = lq_sta->active_tbl;
811
812 curr_tbl = &(lq_sta->lq_info[active_index]);
813 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
814 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
815 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
816
817 /*
818 * Ignore this Tx frame response if its initial rate doesn't match
819 * that of latest Link Quality command. There may be stragglers
820 * from a previous Link Quality command, but we're no longer interested
821 * in those; they're either from the "active" mode while we're trying
822 * to check "search" mode, or a prior "search" mode after we've moved
823 * to a new "search" mode (which might become the new "active" mode).
824 */
825 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
826 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
827 if (priv->band == IEEE80211_BAND_5GHZ)
828 rs_index -= IWL_FIRST_OFDM_RATE;
829
830 if ((info->status.rates[0].idx < 0) ||
831 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
832 (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
833 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
834 (tbl_type.ant_type != info->antenna_sel_tx) ||
835 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
836 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
837 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
838 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
839 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
840 /* the last LQ command could failed so the LQ in ucode not
841 * the same in driver sync up
842 */
843 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
844 goto out;
845 }
846
847 /* Update frame history window with "failure" for each Tx retry. */
848 while (retries) {
849 /* Look up the rate and other info used for each tx attempt.
850 * Each tx attempt steps one entry deeper in the rate table. */
851 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
852 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
853 &tbl_type, &rs_index);
854
855 /* If type matches "search" table,
856 * add failure to "search" history */
857 if ((tbl_type.lq_type == search_tbl->lq_type) &&
858 (tbl_type.ant_type == search_tbl->ant_type) &&
859 (tbl_type.is_SGI == search_tbl->is_SGI)) {
860 if (search_tbl->expected_tpt)
861 tpt = search_tbl->expected_tpt[rs_index];
862 else
863 tpt = 0;
864 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
865
866 /* Else if type matches "current/active" table,
867 * add failure to "current/active" history */
868 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
869 (tbl_type.ant_type == curr_tbl->ant_type) &&
870 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
871 if (curr_tbl->expected_tpt)
872 tpt = curr_tbl->expected_tpt[rs_index];
873 else
874 tpt = 0;
875 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
876 }
877
878 /* If not searching for a new mode, increment failed counter
879 * ... this helps determine when to start searching again */
880 if (lq_sta->stay_in_tbl)
881 lq_sta->total_failed++;
882 --retries;
883 index++;
884
885 }
886
887 /*
888 * Find (by rate) the history window to update with final Tx attempt;
889 * if Tx was successful first try, use original rate,
890 * else look up the rate that was, finally, successful.
891 */
892 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
893 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
894
895 /* Update frame history window with "success" if Tx got ACKed ... */
896 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
897
898 /* If type matches "search" table,
899 * add final tx status to "search" history */
900 if ((tbl_type.lq_type == search_tbl->lq_type) &&
901 (tbl_type.ant_type == search_tbl->ant_type) &&
902 (tbl_type.is_SGI == search_tbl->is_SGI)) {
903 if (search_tbl->expected_tpt)
904 tpt = search_tbl->expected_tpt[rs_index];
905 else
906 tpt = 0;
907 if (info->flags & IEEE80211_TX_CTL_AMPDU)
908 rs_collect_tx_data(search_win, rs_index, tpt,
909 info->status.ampdu_ack_len,
910 info->status.ampdu_ack_map);
911 else
912 rs_collect_tx_data(search_win, rs_index, tpt,
913 1, status);
914 /* Else if type matches "current/active" table,
915 * add final tx status to "current/active" history */
916 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
917 (tbl_type.ant_type == curr_tbl->ant_type) &&
918 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
919 if (curr_tbl->expected_tpt)
920 tpt = curr_tbl->expected_tpt[rs_index];
921 else
922 tpt = 0;
923 if (info->flags & IEEE80211_TX_CTL_AMPDU)
924 rs_collect_tx_data(window, rs_index, tpt,
925 info->status.ampdu_ack_len,
926 info->status.ampdu_ack_map);
927 else
928 rs_collect_tx_data(window, rs_index, tpt,
929 1, status);
930 }
931
932 /* If not searching for new mode, increment success/failed counter
933 * ... these help determine when to start searching again */
934 if (lq_sta->stay_in_tbl) {
935 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
936 lq_sta->total_success += info->status.ampdu_ack_map;
937 lq_sta->total_failed +=
938 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
939 } else {
940 if (status)
941 lq_sta->total_success++;
942 else
943 lq_sta->total_failed++;
944 }
945 }
946
947 /* See if there's a better rate or modulation mode to try. */
948 if (sta && sta->supp_rates[sband->band])
949 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
950 out:
951 return;
952 }
953
954 /*
955 * Begin a period of staying with a selected modulation mode.
956 * Set "stay_in_tbl" flag to prevent any mode switches.
957 * Set frame tx success limits according to legacy vs. high-throughput,
958 * and reset overall (spanning all rates) tx success history statistics.
959 * These control how long we stay using same modulation mode before
960 * searching for a new mode.
961 */
962 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
963 struct iwl_lq_sta *lq_sta)
964 {
965 IWL_DEBUG_RATE("we are staying in the same table\n");
966 lq_sta->stay_in_tbl = 1; /* only place this gets set */
967 if (is_legacy) {
968 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
969 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
970 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
971 } else {
972 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
973 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
974 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
975 }
976 lq_sta->table_count = 0;
977 lq_sta->total_failed = 0;
978 lq_sta->total_success = 0;
979 }
980
981 /*
982 * Find correct throughput table for given mode of modulation
983 */
984 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
985 struct iwl_scale_tbl_info *tbl)
986 {
987 if (is_legacy(tbl->lq_type)) {
988 if (!is_a_band(tbl->lq_type))
989 tbl->expected_tpt = expected_tpt_G;
990 else
991 tbl->expected_tpt = expected_tpt_A;
992 } else if (is_siso(tbl->lq_type)) {
993 if (tbl->is_fat && !lq_sta->is_dup)
994 if (tbl->is_SGI)
995 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
996 else
997 tbl->expected_tpt = expected_tpt_siso40MHz;
998 else if (tbl->is_SGI)
999 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1000 else
1001 tbl->expected_tpt = expected_tpt_siso20MHz;
1002
1003 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1004 if (tbl->is_fat && !lq_sta->is_dup)
1005 if (tbl->is_SGI)
1006 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1007 else
1008 tbl->expected_tpt = expected_tpt_mimo40MHz;
1009 else if (tbl->is_SGI)
1010 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1011 else
1012 tbl->expected_tpt = expected_tpt_mimo20MHz;
1013 } else
1014 tbl->expected_tpt = expected_tpt_G;
1015 }
1016
1017 /*
1018 * Find starting rate for new "search" high-throughput mode of modulation.
1019 * Goal is to find lowest expected rate (under perfect conditions) that is
1020 * above the current measured throughput of "active" mode, to give new mode
1021 * a fair chance to prove itself without too many challenges.
1022 *
1023 * This gets called when transitioning to more aggressive modulation
1024 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1025 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1026 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1027 * bit rate will typically need to increase, but not if performance was bad.
1028 */
1029 static s32 rs_get_best_rate(struct iwl_priv *priv,
1030 struct iwl_lq_sta *lq_sta,
1031 struct iwl_scale_tbl_info *tbl, /* "search" */
1032 u16 rate_mask, s8 index)
1033 {
1034 /* "active" values */
1035 struct iwl_scale_tbl_info *active_tbl =
1036 &(lq_sta->lq_info[lq_sta->active_tbl]);
1037 s32 active_sr = active_tbl->win[index].success_ratio;
1038 s32 active_tpt = active_tbl->expected_tpt[index];
1039
1040 /* expected "search" throughput */
1041 s32 *tpt_tbl = tbl->expected_tpt;
1042
1043 s32 new_rate, high, low, start_hi;
1044 u16 high_low;
1045 s8 rate = index;
1046
1047 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1048
1049 for (; ;) {
1050 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1051 tbl->lq_type);
1052
1053 low = high_low & 0xff;
1054 high = (high_low >> 8) & 0xff;
1055
1056 /*
1057 * Lower the "search" bit rate, to give new "search" mode
1058 * approximately the same throughput as "active" if:
1059 *
1060 * 1) "Active" mode has been working modestly well (but not
1061 * great), and expected "search" throughput (under perfect
1062 * conditions) at candidate rate is above the actual
1063 * measured "active" throughput (but less than expected
1064 * "active" throughput under perfect conditions).
1065 * OR
1066 * 2) "Active" mode has been working perfectly or very well
1067 * and expected "search" throughput (under perfect
1068 * conditions) at candidate rate is above expected
1069 * "active" throughput (under perfect conditions).
1070 */
1071 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1072 ((active_sr > IWL_RATE_DECREASE_TH) &&
1073 (active_sr <= IWL_RATE_HIGH_TH) &&
1074 (tpt_tbl[rate] <= active_tpt))) ||
1075 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1076 (tpt_tbl[rate] > active_tpt))) {
1077
1078 /* (2nd or later pass)
1079 * If we've already tried to raise the rate, and are
1080 * now trying to lower it, use the higher rate. */
1081 if (start_hi != IWL_RATE_INVALID) {
1082 new_rate = start_hi;
1083 break;
1084 }
1085
1086 new_rate = rate;
1087
1088 /* Loop again with lower rate */
1089 if (low != IWL_RATE_INVALID)
1090 rate = low;
1091
1092 /* Lower rate not available, use the original */
1093 else
1094 break;
1095
1096 /* Else try to raise the "search" rate to match "active" */
1097 } else {
1098 /* (2nd or later pass)
1099 * If we've already tried to lower the rate, and are
1100 * now trying to raise it, use the lower rate. */
1101 if (new_rate != IWL_RATE_INVALID)
1102 break;
1103
1104 /* Loop again with higher rate */
1105 else if (high != IWL_RATE_INVALID) {
1106 start_hi = high;
1107 rate = high;
1108
1109 /* Higher rate not available, use the original */
1110 } else {
1111 new_rate = rate;
1112 break;
1113 }
1114 }
1115 }
1116
1117 return new_rate;
1118 }
1119
1120 /*
1121 * Set up search table for MIMO
1122 */
1123 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1124 struct iwl_lq_sta *lq_sta,
1125 struct ieee80211_conf *conf,
1126 struct ieee80211_sta *sta,
1127 struct iwl_scale_tbl_info *tbl, int index)
1128 {
1129 u16 rate_mask;
1130 s32 rate;
1131 s8 is_green = lq_sta->is_green;
1132
1133 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1134 return -1;
1135
1136 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1137 == WLAN_HT_CAP_SM_PS_STATIC)
1138 return -1;
1139
1140 /* Need both Tx chains/antennas to support MIMO */
1141 if (priv->hw_params.tx_chains_num < 2)
1142 return -1;
1143
1144 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1145
1146 tbl->lq_type = LQ_MIMO2;
1147 tbl->is_dup = lq_sta->is_dup;
1148 tbl->action = 0;
1149 rate_mask = lq_sta->active_mimo2_rate;
1150
1151 if (priv->current_ht_config.supported_chan_width
1152 == IWL_CHANNEL_WIDTH_40MHZ)
1153 tbl->is_fat = 1;
1154 else
1155 tbl->is_fat = 0;
1156
1157 /* FIXME: - don't toggle SGI here
1158 if (tbl->is_fat) {
1159 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1160 tbl->is_SGI = 1;
1161 else
1162 tbl->is_SGI = 0;
1163 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1164 tbl->is_SGI = 1;
1165 else
1166 tbl->is_SGI = 0;
1167 */
1168
1169 rs_set_expected_tpt_table(lq_sta, tbl);
1170
1171 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1172
1173 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1174
1175 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1176 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1177 rate, rate_mask);
1178 return -1;
1179 }
1180 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1181
1182 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1183 tbl->current_rate, is_green);
1184 return 0;
1185 }
1186
1187 /*
1188 * Set up search table for SISO
1189 */
1190 static int rs_switch_to_siso(struct iwl_priv *priv,
1191 struct iwl_lq_sta *lq_sta,
1192 struct ieee80211_conf *conf,
1193 struct ieee80211_sta *sta,
1194 struct iwl_scale_tbl_info *tbl, int index)
1195 {
1196 u16 rate_mask;
1197 u8 is_green = lq_sta->is_green;
1198 s32 rate;
1199
1200 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1201 return -1;
1202
1203 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1204
1205 tbl->is_dup = lq_sta->is_dup;
1206 tbl->lq_type = LQ_SISO;
1207 tbl->action = 0;
1208 rate_mask = lq_sta->active_siso_rate;
1209
1210 if (priv->current_ht_config.supported_chan_width
1211 == IWL_CHANNEL_WIDTH_40MHZ)
1212 tbl->is_fat = 1;
1213 else
1214 tbl->is_fat = 0;
1215
1216 /* FIXME: - don't toggle SGI here
1217 if (tbl->is_fat) {
1218 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1219 tbl->is_SGI = 1;
1220 else
1221 tbl->is_SGI = 0;
1222 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1223 tbl->is_SGI = 1;
1224 else
1225 tbl->is_SGI = 0;
1226 */
1227
1228 if (is_green)
1229 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1230
1231 rs_set_expected_tpt_table(lq_sta, tbl);
1232 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1233
1234 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1235 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1236 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1237 rate, rate_mask);
1238 return -1;
1239 }
1240 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1241 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1242 tbl->current_rate, is_green);
1243 return 0;
1244 }
1245
1246 /*
1247 * Try to switch to new modulation mode from legacy
1248 */
1249 static int rs_move_legacy_other(struct iwl_priv *priv,
1250 struct iwl_lq_sta *lq_sta,
1251 struct ieee80211_conf *conf,
1252 struct ieee80211_sta *sta,
1253 int index)
1254 {
1255 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1256 struct iwl_scale_tbl_info *search_tbl =
1257 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1258 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1259 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1260 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1261 u8 start_action = tbl->action;
1262 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1263 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1264 int ret = 0;
1265
1266 for (; ;) {
1267 switch (tbl->action) {
1268 case IWL_LEGACY_SWITCH_ANTENNA1:
1269 case IWL_LEGACY_SWITCH_ANTENNA2:
1270 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1271
1272 lq_sta->action_counter++;
1273
1274 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1275 tx_chains_num <= 1) ||
1276 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1277 tx_chains_num <= 2))
1278 break;
1279
1280 /* Don't change antenna if success has been great */
1281 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1282 break;
1283
1284 /* Set up search table to try other antenna */
1285 memcpy(search_tbl, tbl, sz);
1286
1287 if (rs_toggle_antenna(valid_tx_ant,
1288 &search_tbl->current_rate, search_tbl)) {
1289 rs_set_expected_tpt_table(lq_sta, search_tbl);
1290 goto out;
1291 }
1292 break;
1293 case IWL_LEGACY_SWITCH_SISO:
1294 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1295
1296 /* Set up search table to try SISO */
1297 memcpy(search_tbl, tbl, sz);
1298 search_tbl->is_SGI = 0;
1299 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1300 search_tbl, index);
1301 if (!ret) {
1302 lq_sta->action_counter = 0;
1303 goto out;
1304 }
1305
1306 break;
1307 case IWL_LEGACY_SWITCH_MIMO2_AB:
1308 case IWL_LEGACY_SWITCH_MIMO2_AC:
1309 case IWL_LEGACY_SWITCH_MIMO2_BC:
1310 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1311
1312 /* Set up search table to try MIMO */
1313 memcpy(search_tbl, tbl, sz);
1314 search_tbl->is_SGI = 0;
1315
1316 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1317 search_tbl->ant_type = ANT_AB;
1318 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1319 search_tbl->ant_type = ANT_AC;
1320 else
1321 search_tbl->ant_type = ANT_BC;
1322
1323 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1324 break;
1325
1326 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1327 search_tbl, index);
1328 if (!ret) {
1329 lq_sta->action_counter = 0;
1330 goto out;
1331 }
1332 break;
1333 }
1334 tbl->action++;
1335 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1336 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1337
1338 if (tbl->action == start_action)
1339 break;
1340
1341 }
1342 search_tbl->lq_type = LQ_NONE;
1343 return 0;
1344
1345 out:
1346 lq_sta->search_better_tbl = 1;
1347 tbl->action++;
1348 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1349 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1350 return 0;
1351
1352 }
1353
1354 /*
1355 * Try to switch to new modulation mode from SISO
1356 */
1357 static int rs_move_siso_to_other(struct iwl_priv *priv,
1358 struct iwl_lq_sta *lq_sta,
1359 struct ieee80211_conf *conf,
1360 struct ieee80211_sta *sta, int index)
1361 {
1362 u8 is_green = lq_sta->is_green;
1363 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1364 struct iwl_scale_tbl_info *search_tbl =
1365 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1366 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1367 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1368 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1369 u8 start_action = tbl->action;
1370 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1371 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1372 int ret;
1373
1374 for (;;) {
1375 lq_sta->action_counter++;
1376 switch (tbl->action) {
1377 case IWL_SISO_SWITCH_ANTENNA1:
1378 case IWL_SISO_SWITCH_ANTENNA2:
1379 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1380
1381 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1382 tx_chains_num <= 1) ||
1383 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1384 tx_chains_num <= 2))
1385 break;
1386
1387 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1388 break;
1389
1390 memcpy(search_tbl, tbl, sz);
1391 if (rs_toggle_antenna(valid_tx_ant,
1392 &search_tbl->current_rate, search_tbl))
1393 goto out;
1394 break;
1395 case IWL_SISO_SWITCH_MIMO2_AB:
1396 case IWL_SISO_SWITCH_MIMO2_AC:
1397 case IWL_SISO_SWITCH_MIMO2_BC:
1398 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1399 memcpy(search_tbl, tbl, sz);
1400 search_tbl->is_SGI = 0;
1401
1402 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1403 search_tbl->ant_type = ANT_AB;
1404 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1405 search_tbl->ant_type = ANT_AC;
1406 else
1407 search_tbl->ant_type = ANT_BC;
1408
1409 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1410 break;
1411
1412 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1413 search_tbl, index);
1414 if (!ret)
1415 goto out;
1416 break;
1417 case IWL_SISO_SWITCH_GI:
1418 if (!tbl->is_fat &&
1419 !(priv->current_ht_config.sgf &
1420 HT_SHORT_GI_20MHZ))
1421 break;
1422 if (tbl->is_fat &&
1423 !(priv->current_ht_config.sgf &
1424 HT_SHORT_GI_40MHZ))
1425 break;
1426
1427 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1428
1429 memcpy(search_tbl, tbl, sz);
1430 if (is_green) {
1431 if (!tbl->is_SGI)
1432 break;
1433 else
1434 IWL_ERR(priv,
1435 "SGI was set in GF+SISO\n");
1436 }
1437 search_tbl->is_SGI = !tbl->is_SGI;
1438 rs_set_expected_tpt_table(lq_sta, search_tbl);
1439 if (tbl->is_SGI) {
1440 s32 tpt = lq_sta->last_tpt / 100;
1441 if (tpt >= search_tbl->expected_tpt[index])
1442 break;
1443 }
1444 search_tbl->current_rate =
1445 rate_n_flags_from_tbl(priv, search_tbl,
1446 index, is_green);
1447 goto out;
1448 }
1449 tbl->action++;
1450 if (tbl->action > IWL_SISO_SWITCH_GI)
1451 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1452
1453 if (tbl->action == start_action)
1454 break;
1455 }
1456 search_tbl->lq_type = LQ_NONE;
1457 return 0;
1458
1459 out:
1460 lq_sta->search_better_tbl = 1;
1461 tbl->action++;
1462 if (tbl->action > IWL_SISO_SWITCH_GI)
1463 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1464 return 0;
1465 }
1466
1467 /*
1468 * Try to switch to new modulation mode from MIMO
1469 */
1470 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1471 struct iwl_lq_sta *lq_sta,
1472 struct ieee80211_conf *conf,
1473 struct ieee80211_sta *sta, int index)
1474 {
1475 s8 is_green = lq_sta->is_green;
1476 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1477 struct iwl_scale_tbl_info *search_tbl =
1478 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1479 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1480 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1481 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1482 u8 start_action = tbl->action;
1483 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1484 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1485 int ret;
1486
1487 for (;;) {
1488 lq_sta->action_counter++;
1489 switch (tbl->action) {
1490 case IWL_MIMO2_SWITCH_ANTENNA1:
1491 case IWL_MIMO2_SWITCH_ANTENNA2:
1492 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1493
1494 if (tx_chains_num <= 2)
1495 break;
1496
1497 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1498 break;
1499
1500 memcpy(search_tbl, tbl, sz);
1501 if (rs_toggle_antenna(valid_tx_ant,
1502 &search_tbl->current_rate, search_tbl))
1503 goto out;
1504 break;
1505 case IWL_MIMO2_SWITCH_SISO_A:
1506 case IWL_MIMO2_SWITCH_SISO_B:
1507 case IWL_MIMO2_SWITCH_SISO_C:
1508 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1509
1510 /* Set up new search table for SISO */
1511 memcpy(search_tbl, tbl, sz);
1512
1513 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1514 search_tbl->ant_type = ANT_A;
1515 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1516 search_tbl->ant_type = ANT_B;
1517 else
1518 search_tbl->ant_type = ANT_C;
1519
1520 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1521 break;
1522
1523 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1524 search_tbl, index);
1525 if (!ret)
1526 goto out;
1527
1528 break;
1529
1530 case IWL_MIMO2_SWITCH_GI:
1531 if (!tbl->is_fat &&
1532 !(priv->current_ht_config.sgf &
1533 HT_SHORT_GI_20MHZ))
1534 break;
1535 if (tbl->is_fat &&
1536 !(priv->current_ht_config.sgf &
1537 HT_SHORT_GI_40MHZ))
1538 break;
1539
1540 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1541
1542 /* Set up new search table for MIMO */
1543 memcpy(search_tbl, tbl, sz);
1544 search_tbl->is_SGI = !tbl->is_SGI;
1545 rs_set_expected_tpt_table(lq_sta, search_tbl);
1546 /*
1547 * If active table already uses the fastest possible
1548 * modulation (dual stream with short guard interval),
1549 * and it's working well, there's no need to look
1550 * for a better type of modulation!
1551 */
1552 if (tbl->is_SGI) {
1553 s32 tpt = lq_sta->last_tpt / 100;
1554 if (tpt >= search_tbl->expected_tpt[index])
1555 break;
1556 }
1557 search_tbl->current_rate =
1558 rate_n_flags_from_tbl(priv, search_tbl,
1559 index, is_green);
1560 goto out;
1561
1562 }
1563 tbl->action++;
1564 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1565 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1566
1567 if (tbl->action == start_action)
1568 break;
1569 }
1570 search_tbl->lq_type = LQ_NONE;
1571 return 0;
1572 out:
1573 lq_sta->search_better_tbl = 1;
1574 tbl->action++;
1575 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1576 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1577 return 0;
1578
1579 }
1580
1581 /*
1582 * Check whether we should continue using same modulation mode, or
1583 * begin search for a new mode, based on:
1584 * 1) # tx successes or failures while using this mode
1585 * 2) # times calling this function
1586 * 3) elapsed time in this mode (not used, for now)
1587 */
1588 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1589 {
1590 struct iwl_scale_tbl_info *tbl;
1591 int i;
1592 int active_tbl;
1593 int flush_interval_passed = 0;
1594 struct iwl_priv *priv;
1595
1596 priv = lq_sta->drv;
1597 active_tbl = lq_sta->active_tbl;
1598
1599 tbl = &(lq_sta->lq_info[active_tbl]);
1600
1601 /* If we've been disallowing search, see if we should now allow it */
1602 if (lq_sta->stay_in_tbl) {
1603
1604 /* Elapsed time using current modulation mode */
1605 if (lq_sta->flush_timer)
1606 flush_interval_passed =
1607 time_after(jiffies,
1608 (unsigned long)(lq_sta->flush_timer +
1609 IWL_RATE_SCALE_FLUSH_INTVL));
1610
1611 /*
1612 * Check if we should allow search for new modulation mode.
1613 * If many frames have failed or succeeded, or we've used
1614 * this same modulation for a long time, allow search, and
1615 * reset history stats that keep track of whether we should
1616 * allow a new search. Also (below) reset all bitmaps and
1617 * stats in active history.
1618 */
1619 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1620 (lq_sta->total_success > lq_sta->max_success_limit) ||
1621 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1622 && (flush_interval_passed))) {
1623 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1624 lq_sta->total_failed,
1625 lq_sta->total_success,
1626 flush_interval_passed);
1627
1628 /* Allow search for new mode */
1629 lq_sta->stay_in_tbl = 0; /* only place reset */
1630 lq_sta->total_failed = 0;
1631 lq_sta->total_success = 0;
1632 lq_sta->flush_timer = 0;
1633
1634 /*
1635 * Else if we've used this modulation mode enough repetitions
1636 * (regardless of elapsed time or success/failure), reset
1637 * history bitmaps and rate-specific stats for all rates in
1638 * active table.
1639 */
1640 } else {
1641 lq_sta->table_count++;
1642 if (lq_sta->table_count >=
1643 lq_sta->table_count_limit) {
1644 lq_sta->table_count = 0;
1645
1646 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1647 for (i = 0; i < IWL_RATE_COUNT; i++)
1648 rs_rate_scale_clear_window(
1649 &(tbl->win[i]));
1650 }
1651 }
1652
1653 /* If transitioning to allow "search", reset all history
1654 * bitmaps and stats in active table (this will become the new
1655 * "search" table). */
1656 if (!lq_sta->stay_in_tbl) {
1657 for (i = 0; i < IWL_RATE_COUNT; i++)
1658 rs_rate_scale_clear_window(&(tbl->win[i]));
1659 }
1660 }
1661 }
1662
1663 /*
1664 * Do rate scaling and search for new modulation mode.
1665 */
1666 static void rs_rate_scale_perform(struct iwl_priv *priv,
1667 struct ieee80211_hdr *hdr,
1668 struct ieee80211_sta *sta,
1669 struct iwl_lq_sta *lq_sta)
1670 {
1671 struct ieee80211_hw *hw = priv->hw;
1672 struct ieee80211_conf *conf = &hw->conf;
1673 int low = IWL_RATE_INVALID;
1674 int high = IWL_RATE_INVALID;
1675 int index;
1676 int i;
1677 struct iwl_rate_scale_data *window = NULL;
1678 int current_tpt = IWL_INVALID_VALUE;
1679 int low_tpt = IWL_INVALID_VALUE;
1680 int high_tpt = IWL_INVALID_VALUE;
1681 u32 fail_count;
1682 s8 scale_action = 0;
1683 u16 rate_mask;
1684 u8 update_lq = 0;
1685 struct iwl_scale_tbl_info *tbl, *tbl1;
1686 u16 rate_scale_index_msk = 0;
1687 u32 rate;
1688 u8 is_green = 0;
1689 u8 active_tbl = 0;
1690 u8 done_search = 0;
1691 u16 high_low;
1692 s32 sr;
1693 u8 tid = MAX_TID_COUNT;
1694
1695 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1696
1697 /* Send management frames and broadcast/multicast data using
1698 * lowest rate. */
1699 /* TODO: this could probably be improved.. */
1700 if (!ieee80211_is_data(hdr->frame_control) ||
1701 is_multicast_ether_addr(hdr->addr1))
1702 return;
1703
1704 if (!sta || !lq_sta)
1705 return;
1706
1707 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1708
1709 tid = rs_tl_add_packet(lq_sta, hdr);
1710
1711 /*
1712 * Select rate-scale / modulation-mode table to work with in
1713 * the rest of this function: "search" if searching for better
1714 * modulation mode, or "active" if doing rate scaling within a mode.
1715 */
1716 if (!lq_sta->search_better_tbl)
1717 active_tbl = lq_sta->active_tbl;
1718 else
1719 active_tbl = 1 - lq_sta->active_tbl;
1720
1721 tbl = &(lq_sta->lq_info[active_tbl]);
1722 is_green = lq_sta->is_green;
1723
1724 /* current tx rate */
1725 index = lq_sta->last_txrate_idx;
1726
1727 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1728 tbl->lq_type);
1729
1730 /* rates available for this association, and for modulation mode */
1731 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1732
1733 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1734
1735 /* mask with station rate restriction */
1736 if (is_legacy(tbl->lq_type)) {
1737 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1738 /* supp_rates has no CCK bits in A mode */
1739 rate_scale_index_msk = (u16) (rate_mask &
1740 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1741 else
1742 rate_scale_index_msk = (u16) (rate_mask &
1743 lq_sta->supp_rates);
1744
1745 } else
1746 rate_scale_index_msk = rate_mask;
1747
1748 if (!rate_scale_index_msk)
1749 rate_scale_index_msk = rate_mask;
1750
1751 if (!((1 << index) & rate_scale_index_msk)) {
1752 IWL_ERR(priv, "Current Rate is not valid\n");
1753 return;
1754 }
1755
1756 /* Get expected throughput table and history window for current rate */
1757 if (!tbl->expected_tpt) {
1758 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
1759 return;
1760 }
1761
1762 window = &(tbl->win[index]);
1763
1764 /*
1765 * If there is not enough history to calculate actual average
1766 * throughput, keep analyzing results of more tx frames, without
1767 * changing rate or mode (bypass most of the rest of this function).
1768 * Set up new rate table in uCode only if old rate is not supported
1769 * in current association (use new rate found above).
1770 */
1771 fail_count = window->counter - window->success_counter;
1772 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1773 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1774 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1775 "for index %d\n",
1776 window->success_counter, window->counter, index);
1777
1778 /* Can't calculate this yet; not enough history */
1779 window->average_tpt = IWL_INVALID_VALUE;
1780
1781 /* Should we stay with this modulation mode,
1782 * or search for a new one? */
1783 rs_stay_in_table(lq_sta);
1784
1785 goto out;
1786 }
1787
1788 /* Else we have enough samples; calculate estimate of
1789 * actual average throughput */
1790
1791 BUG_ON(window->average_tpt != ((window->success_ratio *
1792 tbl->expected_tpt[index] + 64) / 128));
1793
1794 /* If we are searching for better modulation mode, check success. */
1795 if (lq_sta->search_better_tbl) {
1796
1797 /* If good success, continue using the "search" mode;
1798 * no need to send new link quality command, since we're
1799 * continuing to use the setup that we've been trying. */
1800 if (window->average_tpt > lq_sta->last_tpt) {
1801
1802 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1803 "suc=%d cur-tpt=%d old-tpt=%d\n",
1804 window->success_ratio,
1805 window->average_tpt,
1806 lq_sta->last_tpt);
1807
1808 if (!is_legacy(tbl->lq_type))
1809 lq_sta->enable_counter = 1;
1810
1811 /* Swap tables; "search" becomes "active" */
1812 lq_sta->active_tbl = active_tbl;
1813 current_tpt = window->average_tpt;
1814
1815 /* Else poor success; go back to mode in "active" table */
1816 } else {
1817
1818 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1819 "suc=%d cur-tpt=%d old-tpt=%d\n",
1820 window->success_ratio,
1821 window->average_tpt,
1822 lq_sta->last_tpt);
1823
1824 /* Nullify "search" table */
1825 tbl->lq_type = LQ_NONE;
1826
1827 /* Revert to "active" table */
1828 active_tbl = lq_sta->active_tbl;
1829 tbl = &(lq_sta->lq_info[active_tbl]);
1830
1831 /* Revert to "active" rate and throughput info */
1832 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1833 current_tpt = lq_sta->last_tpt;
1834
1835 /* Need to set up a new rate table in uCode */
1836 update_lq = 1;
1837 }
1838
1839 /* Either way, we've made a decision; modulation mode
1840 * search is done, allow rate adjustment next time. */
1841 lq_sta->search_better_tbl = 0;
1842 done_search = 1; /* Don't switch modes below! */
1843 goto lq_update;
1844 }
1845
1846 /* (Else) not in search of better modulation mode, try for better
1847 * starting rate, while staying in this mode. */
1848 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1849 tbl->lq_type);
1850 low = high_low & 0xff;
1851 high = (high_low >> 8) & 0xff;
1852
1853 sr = window->success_ratio;
1854
1855 /* Collect measured throughputs for current and adjacent rates */
1856 current_tpt = window->average_tpt;
1857 if (low != IWL_RATE_INVALID)
1858 low_tpt = tbl->win[low].average_tpt;
1859 if (high != IWL_RATE_INVALID)
1860 high_tpt = tbl->win[high].average_tpt;
1861
1862 scale_action = 0;
1863
1864 /* Too many failures, decrease rate */
1865 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1866 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1867 scale_action = -1;
1868
1869 /* No throughput measured yet for adjacent rates; try increase. */
1870 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1871 (high_tpt == IWL_INVALID_VALUE)) {
1872
1873 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1874 scale_action = 1;
1875 else if (low != IWL_RATE_INVALID)
1876 scale_action = -1;
1877 }
1878
1879 /* Both adjacent throughputs are measured, but neither one has better
1880 * throughput; we're using the best rate, don't change it! */
1881 else if ((low_tpt != IWL_INVALID_VALUE) &&
1882 (high_tpt != IWL_INVALID_VALUE) &&
1883 (low_tpt < current_tpt) &&
1884 (high_tpt < current_tpt))
1885 scale_action = 0;
1886
1887 /* At least one adjacent rate's throughput is measured,
1888 * and may have better performance. */
1889 else {
1890 /* Higher adjacent rate's throughput is measured */
1891 if (high_tpt != IWL_INVALID_VALUE) {
1892 /* Higher rate has better throughput */
1893 if (high_tpt > current_tpt &&
1894 sr >= IWL_RATE_INCREASE_TH) {
1895 scale_action = 1;
1896 } else {
1897 IWL_DEBUG_RATE
1898 ("decrease rate because of high tpt\n");
1899 scale_action = -1;
1900 }
1901
1902 /* Lower adjacent rate's throughput is measured */
1903 } else if (low_tpt != IWL_INVALID_VALUE) {
1904 /* Lower rate has better throughput */
1905 if (low_tpt > current_tpt) {
1906 IWL_DEBUG_RATE
1907 ("decrease rate because of low tpt\n");
1908 scale_action = -1;
1909 } else if (sr >= IWL_RATE_INCREASE_TH) {
1910 scale_action = 1;
1911 }
1912 }
1913 }
1914
1915 /* Sanity check; asked for decrease, but success rate or throughput
1916 * has been good at old rate. Don't change it. */
1917 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1918 ((sr > IWL_RATE_HIGH_TH) ||
1919 (current_tpt > (100 * tbl->expected_tpt[low]))))
1920 scale_action = 0;
1921
1922 switch (scale_action) {
1923 case -1:
1924 /* Decrease starting rate, update uCode's rate table */
1925 if (low != IWL_RATE_INVALID) {
1926 update_lq = 1;
1927 index = low;
1928 }
1929 break;
1930 case 1:
1931 /* Increase starting rate, update uCode's rate table */
1932 if (high != IWL_RATE_INVALID) {
1933 update_lq = 1;
1934 index = high;
1935 }
1936
1937 break;
1938 case 0:
1939 /* No change */
1940 default:
1941 break;
1942 }
1943
1944 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1945 "high %d type %d\n",
1946 index, scale_action, low, high, tbl->lq_type);
1947
1948 lq_update:
1949 /* Replace uCode's rate table for the destination station. */
1950 if (update_lq) {
1951 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1952 rs_fill_link_cmd(priv, lq_sta, rate);
1953 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1954 }
1955
1956 /* Should we stay with this modulation mode, or search for a new one? */
1957 rs_stay_in_table(lq_sta);
1958
1959 /*
1960 * Search for new modulation mode if we're:
1961 * 1) Not changing rates right now
1962 * 2) Not just finishing up a search
1963 * 3) Allowing a new search
1964 */
1965 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1966 /* Save current throughput to compare with "search" throughput*/
1967 lq_sta->last_tpt = current_tpt;
1968
1969 /* Select a new "search" modulation mode to try.
1970 * If one is found, set up the new "search" table. */
1971 if (is_legacy(tbl->lq_type))
1972 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1973 else if (is_siso(tbl->lq_type))
1974 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1975 else
1976 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1977
1978 /* If new "search" mode was selected, set up in uCode table */
1979 if (lq_sta->search_better_tbl) {
1980 /* Access the "search" table, clear its history. */
1981 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1982 for (i = 0; i < IWL_RATE_COUNT; i++)
1983 rs_rate_scale_clear_window(&(tbl->win[i]));
1984
1985 /* Use new "search" start rate */
1986 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1987
1988 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1989 tbl->current_rate, index);
1990 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1991 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1992 }
1993
1994 /* If the "active" (non-search) mode was legacy,
1995 * and we've tried switching antennas,
1996 * but we haven't been able to try HT modes (not available),
1997 * stay with best antenna legacy modulation for a while
1998 * before next round of mode comparisons. */
1999 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2000 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2001 lq_sta->action_counter >= 1) {
2002 lq_sta->action_counter = 0;
2003 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2004 rs_set_stay_in_table(priv, 1, lq_sta);
2005 }
2006
2007 /* If we're in an HT mode, and all 3 mode switch actions
2008 * have been tried and compared, stay in this best modulation
2009 * mode for a while before next round of mode comparisons. */
2010 if (lq_sta->enable_counter &&
2011 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2012 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2013 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2014 (tid != MAX_TID_COUNT)) {
2015 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2016 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2017 }
2018 lq_sta->action_counter = 0;
2019 rs_set_stay_in_table(priv, 0, lq_sta);
2020 }
2021
2022 /*
2023 * Else, don't search for a new modulation mode.
2024 * Put new timestamp in stay-in-modulation-mode flush timer if:
2025 * 1) Not changing rates right now
2026 * 2) Not just finishing up a search
2027 * 3) flush timer is empty
2028 */
2029 } else {
2030 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2031 lq_sta->flush_timer = jiffies;
2032 }
2033
2034 out:
2035 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2036 i = index;
2037 lq_sta->last_txrate_idx = i;
2038
2039 return;
2040 }
2041
2042
2043 static void rs_initialize_lq(struct iwl_priv *priv,
2044 struct ieee80211_conf *conf,
2045 struct ieee80211_sta *sta,
2046 struct iwl_lq_sta *lq_sta)
2047 {
2048 struct iwl_scale_tbl_info *tbl;
2049 int rate_idx;
2050 int i;
2051 u32 rate;
2052 u8 use_green = rs_use_green(priv, conf);
2053 u8 active_tbl = 0;
2054 u8 valid_tx_ant;
2055
2056 if (!sta || !lq_sta)
2057 goto out;
2058
2059 i = lq_sta->last_txrate_idx;
2060
2061 if ((lq_sta->lq.sta_id == 0xff) &&
2062 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2063 goto out;
2064
2065 valid_tx_ant = priv->hw_params.valid_tx_ant;
2066
2067 if (!lq_sta->search_better_tbl)
2068 active_tbl = lq_sta->active_tbl;
2069 else
2070 active_tbl = 1 - lq_sta->active_tbl;
2071
2072 tbl = &(lq_sta->lq_info[active_tbl]);
2073
2074 if ((i < 0) || (i >= IWL_RATE_COUNT))
2075 i = 0;
2076
2077 rate = iwl_rates[i].plcp;
2078 tbl->ant_type = first_antenna(valid_tx_ant);
2079 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2080
2081 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2082 rate |= RATE_MCS_CCK_MSK;
2083
2084 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2085 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2086 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2087
2088 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2089 tbl->current_rate = rate;
2090 rs_set_expected_tpt_table(lq_sta, tbl);
2091 rs_fill_link_cmd(NULL, lq_sta, rate);
2092 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2093 out:
2094 return;
2095 }
2096
2097 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2098 struct ieee80211_tx_rate_control *txrc)
2099 {
2100
2101 struct sk_buff *skb = txrc->skb;
2102 struct ieee80211_supported_band *sband = txrc->sband;
2103 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2104 struct ieee80211_conf *conf = &priv->hw->conf;
2105 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2106 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2107 struct iwl_lq_sta *lq_sta = priv_sta;
2108 int rate_idx;
2109 u64 mask_bit = 0;
2110
2111 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2112
2113 if (sta)
2114 mask_bit = sta->supp_rates[sband->band];
2115
2116 /* Send management frames and broadcast/multicast data using lowest
2117 * rate. */
2118 if (!ieee80211_is_data(hdr->frame_control) ||
2119 is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) {
2120 if (!mask_bit)
2121 info->control.rates[0].idx =
2122 rate_lowest_index(sband, NULL);
2123 else
2124 info->control.rates[0].idx =
2125 rate_lowest_index(sband, sta);
2126 return;
2127 }
2128
2129 rate_idx = lq_sta->last_txrate_idx;
2130
2131 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2132 !lq_sta->ibss_sta_added) {
2133 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2134
2135 if (sta_id == IWL_INVALID_STATION) {
2136 IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2137 hdr->addr1);
2138 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2139 0, CMD_ASYNC, NULL);
2140 }
2141 if ((sta_id != IWL_INVALID_STATION)) {
2142 lq_sta->lq.sta_id = sta_id;
2143 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2144 lq_sta->ibss_sta_added = 1;
2145 rs_initialize_lq(priv, conf, sta, lq_sta);
2146 }
2147 }
2148
2149 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2150 rate_idx = rate_lowest_index(sband, sta);
2151 else if (sband->band == IEEE80211_BAND_5GHZ)
2152 rate_idx -= IWL_FIRST_OFDM_RATE;
2153
2154 info->control.rates[0].idx = rate_idx;
2155 }
2156
2157 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2158 gfp_t gfp)
2159 {
2160 struct iwl_lq_sta *lq_sta;
2161 struct iwl_priv *priv;
2162 int i, j;
2163
2164 priv = (struct iwl_priv *)priv_rate;
2165 IWL_DEBUG_RATE("create station rate scale window\n");
2166
2167 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2168
2169 if (lq_sta == NULL)
2170 return NULL;
2171 lq_sta->lq.sta_id = 0xff;
2172
2173
2174 for (j = 0; j < LQ_SIZE; j++)
2175 for (i = 0; i < IWL_RATE_COUNT; i++)
2176 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2177
2178 return lq_sta;
2179 }
2180
2181 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2182 struct ieee80211_sta *sta, void *priv_sta)
2183 {
2184 int i, j;
2185 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2186 struct ieee80211_conf *conf = &priv->hw->conf;
2187 struct iwl_lq_sta *lq_sta = priv_sta;
2188 u16 mask_bit = 0;
2189
2190 lq_sta->flush_timer = 0;
2191 lq_sta->supp_rates = sta->supp_rates[sband->band];
2192 for (j = 0; j < LQ_SIZE; j++)
2193 for (i = 0; i < IWL_RATE_COUNT; i++)
2194 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2195
2196 IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2197 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2198 * the lowest or the highest rate.. Could consider using RSSI from
2199 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2200 * after assoc.. */
2201
2202 lq_sta->ibss_sta_added = 0;
2203 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2204 u8 sta_id = iwl_find_station(priv, sta->addr);
2205
2206 /* for IBSS the call are from tasklet */
2207 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2208
2209 if (sta_id == IWL_INVALID_STATION) {
2210 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2211 sta_id = iwl_add_station_flags(priv, sta->addr,
2212 0, CMD_ASYNC, NULL);
2213 }
2214 if ((sta_id != IWL_INVALID_STATION)) {
2215 lq_sta->lq.sta_id = sta_id;
2216 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2217 }
2218 /* FIXME: this is w/a remove it later */
2219 priv->assoc_station_added = 1;
2220 }
2221
2222 lq_sta->is_dup = 0;
2223 lq_sta->is_green = rs_use_green(priv, conf);
2224 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2225 lq_sta->active_rate_basic = priv->active_rate_basic;
2226 lq_sta->band = priv->band;
2227 /*
2228 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2229 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2230 */
2231 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2232 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2233 lq_sta->active_siso_rate &= ~((u16)0x2);
2234 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2235
2236 /* Same here */
2237 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2238 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2239 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2240 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2241
2242 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2243 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2244 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2245 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2246
2247 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2248 lq_sta->active_siso_rate,
2249 lq_sta->active_mimo2_rate,
2250 lq_sta->active_mimo3_rate);
2251
2252 /* These values will be overridden later */
2253 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2254 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2255
2256 /* as default allow aggregation for all tids */
2257 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2258 lq_sta->drv = priv;
2259
2260 /* Find highest tx rate supported by hardware and destination station */
2261 mask_bit = sta->supp_rates[sband->band] & lq_sta->active_legacy_rate;
2262 lq_sta->last_txrate_idx = 3;
2263 for (i = 0; i < sband->n_bitrates; i++)
2264 if (mask_bit & BIT(i))
2265 lq_sta->last_txrate_idx = i;
2266
2267 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2268 if (sband->band == IEEE80211_BAND_5GHZ)
2269 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2270
2271 rs_initialize_lq(priv, conf, sta, lq_sta);
2272 }
2273
2274 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2275 struct iwl_lq_sta *lq_sta, u32 new_rate)
2276 {
2277 struct iwl_scale_tbl_info tbl_type;
2278 int index = 0;
2279 int rate_idx;
2280 int repeat_rate = 0;
2281 u8 ant_toggle_cnt = 0;
2282 u8 use_ht_possible = 1;
2283 u8 valid_tx_ant = 0;
2284 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2285
2286 /* Override starting rate (index 0) if needed for debug purposes */
2287 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2288
2289 /* Interpret new_rate (rate_n_flags) */
2290 memset(&tbl_type, 0, sizeof(tbl_type));
2291 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2292 &tbl_type, &rate_idx);
2293
2294 /* How many times should we repeat the initial rate? */
2295 if (is_legacy(tbl_type.lq_type)) {
2296 ant_toggle_cnt = 1;
2297 repeat_rate = IWL_NUMBER_TRY;
2298 } else {
2299 repeat_rate = IWL_HT_NUMBER_TRY;
2300 }
2301
2302 lq_cmd->general_params.mimo_delimiter =
2303 is_mimo(tbl_type.lq_type) ? 1 : 0;
2304
2305 /* Fill 1st table entry (index 0) */
2306 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2307
2308 if (num_of_ant(tbl_type.ant_type) == 1) {
2309 lq_cmd->general_params.single_stream_ant_msk =
2310 tbl_type.ant_type;
2311 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2312 lq_cmd->general_params.dual_stream_ant_msk =
2313 tbl_type.ant_type;
2314 } /* otherwise we don't modify the existing value */
2315
2316 index++;
2317 repeat_rate--;
2318
2319 if (priv)
2320 valid_tx_ant = priv->hw_params.valid_tx_ant;
2321
2322 /* Fill rest of rate table */
2323 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2324 /* Repeat initial/next rate.
2325 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2326 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2327 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2328 if (is_legacy(tbl_type.lq_type)) {
2329 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2330 ant_toggle_cnt++;
2331 else if (priv &&
2332 rs_toggle_antenna(valid_tx_ant,
2333 &new_rate, &tbl_type))
2334 ant_toggle_cnt = 1;
2335 }
2336
2337 /* Override next rate if needed for debug purposes */
2338 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2339
2340 /* Fill next table entry */
2341 lq_cmd->rs_table[index].rate_n_flags =
2342 cpu_to_le32(new_rate);
2343 repeat_rate--;
2344 index++;
2345 }
2346
2347 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2348 &rate_idx);
2349
2350 /* Indicate to uCode which entries might be MIMO.
2351 * If initial rate was MIMO, this will finally end up
2352 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2353 if (is_mimo(tbl_type.lq_type))
2354 lq_cmd->general_params.mimo_delimiter = index;
2355
2356 /* Get next rate */
2357 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2358 use_ht_possible);
2359
2360 /* How many times should we repeat the next rate? */
2361 if (is_legacy(tbl_type.lq_type)) {
2362 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2363 ant_toggle_cnt++;
2364 else if (priv &&
2365 rs_toggle_antenna(valid_tx_ant,
2366 &new_rate, &tbl_type))
2367 ant_toggle_cnt = 1;
2368
2369 repeat_rate = IWL_NUMBER_TRY;
2370 } else {
2371 repeat_rate = IWL_HT_NUMBER_TRY;
2372 }
2373
2374 /* Don't allow HT rates after next pass.
2375 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2376 use_ht_possible = 0;
2377
2378 /* Override next rate if needed for debug purposes */
2379 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2380
2381 /* Fill next table entry */
2382 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2383
2384 index++;
2385 repeat_rate--;
2386 }
2387
2388 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2389 lq_cmd->agg_params.agg_dis_start_th = 3;
2390 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2391 }
2392
2393 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2394 {
2395 return hw->priv;
2396 }
2397 /* rate scale requires free function to be implemented */
2398 static void rs_free(void *priv_rate)
2399 {
2400 return;
2401 }
2402
2403 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2404 void *priv_sta)
2405 {
2406 struct iwl_lq_sta *lq_sta = priv_sta;
2407 struct iwl_priv *priv __maybe_unused = priv_r;
2408
2409 IWL_DEBUG_RATE("enter\n");
2410 kfree(lq_sta);
2411 IWL_DEBUG_RATE("leave\n");
2412 }
2413
2414
2415 #ifdef CONFIG_MAC80211_DEBUGFS
2416 static int open_file_generic(struct inode *inode, struct file *file)
2417 {
2418 file->private_data = inode->i_private;
2419 return 0;
2420 }
2421 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2422 u32 *rate_n_flags, int index)
2423 {
2424 struct iwl_priv *priv;
2425
2426 priv = lq_sta->drv;
2427 if (lq_sta->dbg_fixed_rate) {
2428 if (index < 12) {
2429 *rate_n_flags = lq_sta->dbg_fixed_rate;
2430 } else {
2431 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2432 *rate_n_flags = 0x800D;
2433 else
2434 *rate_n_flags = 0x820A;
2435 }
2436 IWL_DEBUG_RATE("Fixed rate ON\n");
2437 } else {
2438 IWL_DEBUG_RATE("Fixed rate OFF\n");
2439 }
2440 }
2441
2442 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2443 const char __user *user_buf, size_t count, loff_t *ppos)
2444 {
2445 struct iwl_lq_sta *lq_sta = file->private_data;
2446 struct iwl_priv *priv;
2447 char buf[64];
2448 int buf_size;
2449 u32 parsed_rate;
2450
2451 priv = lq_sta->drv;
2452 memset(buf, 0, sizeof(buf));
2453 buf_size = min(count, sizeof(buf) - 1);
2454 if (copy_from_user(buf, user_buf, buf_size))
2455 return -EFAULT;
2456
2457 if (sscanf(buf, "%x", &parsed_rate) == 1)
2458 lq_sta->dbg_fixed_rate = parsed_rate;
2459 else
2460 lq_sta->dbg_fixed_rate = 0;
2461
2462 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2463 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2464 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2465 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2466
2467 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2468 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2469
2470 if (lq_sta->dbg_fixed_rate) {
2471 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2472 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2473 }
2474
2475 return count;
2476 }
2477
2478 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2479 char __user *user_buf, size_t count, loff_t *ppos)
2480 {
2481 char buff[1024];
2482 int desc = 0;
2483 int i = 0;
2484
2485 struct iwl_lq_sta *lq_sta = file->private_data;
2486
2487 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2488 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2489 lq_sta->total_failed, lq_sta->total_success,
2490 lq_sta->active_legacy_rate);
2491 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2492 lq_sta->dbg_fixed_rate);
2493 desc += sprintf(buff+desc, "general:"
2494 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2495 lq_sta->lq.general_params.flags,
2496 lq_sta->lq.general_params.mimo_delimiter,
2497 lq_sta->lq.general_params.single_stream_ant_msk,
2498 lq_sta->lq.general_params.dual_stream_ant_msk);
2499
2500 desc += sprintf(buff+desc, "agg:"
2501 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2502 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2503 lq_sta->lq.agg_params.agg_dis_start_th,
2504 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2505
2506 desc += sprintf(buff+desc,
2507 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2508 lq_sta->lq.general_params.start_rate_index[0],
2509 lq_sta->lq.general_params.start_rate_index[1],
2510 lq_sta->lq.general_params.start_rate_index[2],
2511 lq_sta->lq.general_params.start_rate_index[3]);
2512
2513
2514 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2515 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2516 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2517
2518 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2519 }
2520
2521 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2522 .write = rs_sta_dbgfs_scale_table_write,
2523 .read = rs_sta_dbgfs_scale_table_read,
2524 .open = open_file_generic,
2525 };
2526 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2527 char __user *user_buf, size_t count, loff_t *ppos)
2528 {
2529 char buff[1024];
2530 int desc = 0;
2531 int i, j;
2532
2533 struct iwl_lq_sta *lq_sta = file->private_data;
2534 for (i = 0; i < LQ_SIZE; i++) {
2535 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2536 "rate=0x%X\n",
2537 lq_sta->active_tbl == i ? "*" : "x",
2538 lq_sta->lq_info[i].lq_type,
2539 lq_sta->lq_info[i].is_SGI,
2540 lq_sta->lq_info[i].is_fat,
2541 lq_sta->lq_info[i].is_dup,
2542 lq_sta->lq_info[i].current_rate);
2543 for (j = 0; j < IWL_RATE_COUNT; j++) {
2544 desc += sprintf(buff+desc,
2545 "counter=%d success=%d %%=%d\n",
2546 lq_sta->lq_info[i].win[j].counter,
2547 lq_sta->lq_info[i].win[j].success_counter,
2548 lq_sta->lq_info[i].win[j].success_ratio);
2549 }
2550 }
2551 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2552 }
2553
2554 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2555 .read = rs_sta_dbgfs_stats_table_read,
2556 .open = open_file_generic,
2557 };
2558
2559 static void rs_add_debugfs(void *priv, void *priv_sta,
2560 struct dentry *dir)
2561 {
2562 struct iwl_lq_sta *lq_sta = priv_sta;
2563 lq_sta->rs_sta_dbgfs_scale_table_file =
2564 debugfs_create_file("rate_scale_table", 0600, dir,
2565 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2566 lq_sta->rs_sta_dbgfs_stats_table_file =
2567 debugfs_create_file("rate_stats_table", 0600, dir,
2568 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2569 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2570 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2571 &lq_sta->tx_agg_tid_en);
2572
2573 }
2574
2575 static void rs_remove_debugfs(void *priv, void *priv_sta)
2576 {
2577 struct iwl_lq_sta *lq_sta = priv_sta;
2578 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2579 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2580 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2581 }
2582 #endif
2583
2584 static struct rate_control_ops rs_ops = {
2585 .module = NULL,
2586 .name = RS_NAME,
2587 .tx_status = rs_tx_status,
2588 .get_rate = rs_get_rate,
2589 .rate_init = rs_rate_init,
2590 .alloc = rs_alloc,
2591 .free = rs_free,
2592 .alloc_sta = rs_alloc_sta,
2593 .free_sta = rs_free_sta,
2594 #ifdef CONFIG_MAC80211_DEBUGFS
2595 .add_sta_debugfs = rs_add_debugfs,
2596 .remove_sta_debugfs = rs_remove_debugfs,
2597 #endif
2598 };
2599
2600 int iwlagn_rate_control_register(void)
2601 {
2602 return ieee80211_rate_control_register(&rs_ops);
2603 }
2604
2605 void iwlagn_rate_control_unregister(void)
2606 {
2607 ieee80211_rate_control_unregister(&rs_ops);
2608 }
2609
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