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mac80211: remove rate_control_clear
[linux-2.6/mini2440.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob6fdb2fb755b006284ae31a723bc1903b4c13fc26
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
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 #include "iwl-helpers.h"
42
43 #define RS_NAME "iwl-agn-rs"
44
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
48
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
53 /* max time to accum history 2 seconds */
54 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
55
56 static u8 rs_ht_to_legacy[] = {
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
61 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
62 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
63 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 /*ANT_NONE -> */ ANT_NONE,
68 /*ANT_A -> */ ANT_B,
69 /*ANT_B -> */ ANT_C,
70 /*ANT_AB -> */ ANT_BC,
71 /*ANT_C -> */ ANT_A,
72 /*ANT_AC -> */ ANT_AB,
73 /*ANT_BC -> */ ANT_AC,
74 /*ANT_ABC -> */ ANT_ABC,
75 };
76
77 /**
78 * struct iwl_rate_scale_data -- tx success history for one rate
79 */
80 struct iwl_rate_scale_data {
81 u64 data; /* bitmap of successful frames */
82 s32 success_counter; /* number of frames successful */
83 s32 success_ratio; /* per-cent * 128 */
84 s32 counter; /* number of frames attempted */
85 s32 average_tpt; /* success ratio * expected throughput */
86 unsigned long stamp;
87 };
88
89 /**
90 * struct iwl_scale_tbl_info -- tx params and success history for all rates
91 *
92 * There are two of these in struct iwl_lq_sta,
93 * one for "active", and one for "search".
94 */
95 struct iwl_scale_tbl_info {
96 enum iwl_table_type lq_type;
97 u8 ant_type;
98 u8 is_SGI; /* 1 = short guard interval */
99 u8 is_fat; /* 1 = 40 MHz channel width */
100 u8 is_dup; /* 1 = duplicated data streams */
101 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
102 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
103 u32 current_rate; /* rate_n_flags, uCode API format */
104 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
105 };
106
107 struct iwl_traffic_load {
108 unsigned long time_stamp; /* age of the oldest statistics */
109 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
110 * slice */
111 u32 total; /* total num of packets during the
112 * last TID_MAX_TIME_DIFF */
113 u8 queue_count; /* number of queues that has
114 * been used since the last cleanup */
115 u8 head; /* start of the circular buffer */
116 };
117
118 /**
119 * struct iwl_lq_sta -- driver's rate scaling private structure
120 *
121 * Pointer to this gets passed back and forth between driver and mac80211.
122 */
123 struct iwl_lq_sta {
124 u8 active_tbl; /* index of active table, range 0-1 */
125 u8 enable_counter; /* indicates HT mode */
126 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
127 u8 search_better_tbl; /* 1: currently trying alternate mode */
128 s32 last_tpt;
129
130 /* The following determine when to search for a new mode */
131 u32 table_count_limit;
132 u32 max_failure_limit; /* # failed frames before new search */
133 u32 max_success_limit; /* # successful frames before new search */
134 u32 table_count;
135 u32 total_failed; /* total failed frames, any/all rates */
136 u32 total_success; /* total successful frames, any/all rates */
137 u32 flush_timer; /* time staying in mode before new search */
138
139 u8 action_counter; /* # mode-switch actions tried */
140 u8 is_green;
141 u8 is_dup;
142 enum ieee80211_band band;
143 u8 ibss_sta_added;
144
145 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
146 u32 supp_rates;
147 u16 active_legacy_rate;
148 u16 active_siso_rate;
149 u16 active_mimo2_rate;
150 u16 active_mimo3_rate;
151 u16 active_rate_basic;
152
153 struct iwl_link_quality_cmd lq;
154 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
155 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
156 u8 tx_agg_tid_en;
157 #ifdef CONFIG_MAC80211_DEBUGFS
158 struct dentry *rs_sta_dbgfs_scale_table_file;
159 struct dentry *rs_sta_dbgfs_stats_table_file;
160 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
161 u32 dbg_fixed_rate;
162 #endif
163 struct iwl_priv *drv;
164
165 /* used to be in sta_info */
166 int last_txrate_idx;
167 };
168
169 static void rs_rate_scale_perform(struct iwl_priv *priv,
170 struct ieee80211_hdr *hdr,
171 struct ieee80211_sta *sta,
172 struct iwl_lq_sta *lq_sta);
173 static void rs_fill_link_cmd(const struct iwl_priv *priv,
174 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
175
176
177 #ifdef CONFIG_MAC80211_DEBUGFS
178 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
179 u32 *rate_n_flags, int index);
180 #else
181 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
182 u32 *rate_n_flags, int index)
183 {}
184 #endif
185
186 /*
187 * Expected throughput metrics for following rates:
188 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
189 * "G" is the only table that supports CCK (the first 4 rates).
190 */
191 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
192 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
193 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
194 };
195
196 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
197 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
198 };
199
200 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
201 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
202 };
203
204 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
205 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
206 };
207
208 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
209 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
210 };
211
212 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
213 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
214 };
215
216 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
217 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
218 };
219
220 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
221 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
222 };
223
224 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
225 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
226 };
227
228 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
229 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
230 };
231
232 static inline u8 rs_extract_rate(u32 rate_n_flags)
233 {
234 return (u8)(rate_n_flags & 0xFF);
235 }
236
237 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
238 {
239 window->data = 0;
240 window->success_counter = 0;
241 window->success_ratio = IWL_INVALID_VALUE;
242 window->counter = 0;
243 window->average_tpt = IWL_INVALID_VALUE;
244 window->stamp = 0;
245 }
246
247 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
248 {
249 return (ant_type & valid_antenna) == ant_type;
250 }
251
252 /*
253 * removes the old data from the statistics. All data that is older than
254 * TID_MAX_TIME_DIFF, will be deleted.
255 */
256 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
257 {
258 /* The oldest age we want to keep */
259 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
260
261 while (tl->queue_count &&
262 (tl->time_stamp < oldest_time)) {
263 tl->total -= tl->packet_count[tl->head];
264 tl->packet_count[tl->head] = 0;
265 tl->time_stamp += TID_QUEUE_CELL_SPACING;
266 tl->queue_count--;
267 tl->head++;
268 if (tl->head >= TID_QUEUE_MAX_SIZE)
269 tl->head = 0;
270 }
271 }
272
273 /*
274 * increment traffic load value for tid and also remove
275 * any old values if passed the certain time period
276 */
277 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
278 struct ieee80211_hdr *hdr)
279 {
280 u32 curr_time = jiffies_to_msecs(jiffies);
281 u32 time_diff;
282 s32 index;
283 struct iwl_traffic_load *tl = NULL;
284 __le16 fc = hdr->frame_control;
285 u8 tid;
286
287 if (ieee80211_is_data_qos(fc)) {
288 u8 *qc = ieee80211_get_qos_ctl(hdr);
289 tid = qc[0] & 0xf;
290 } else
291 return MAX_TID_COUNT;
292
293 tl = &lq_data->load[tid];
294
295 curr_time -= curr_time % TID_ROUND_VALUE;
296
297 /* Happens only for the first packet. Initialize the data */
298 if (!(tl->queue_count)) {
299 tl->total = 1;
300 tl->time_stamp = curr_time;
301 tl->queue_count = 1;
302 tl->head = 0;
303 tl->packet_count[0] = 1;
304 return MAX_TID_COUNT;
305 }
306
307 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
308 index = time_diff / TID_QUEUE_CELL_SPACING;
309
310 /* The history is too long: remove data that is older than */
311 /* TID_MAX_TIME_DIFF */
312 if (index >= TID_QUEUE_MAX_SIZE)
313 rs_tl_rm_old_stats(tl, curr_time);
314
315 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
316 tl->packet_count[index] = tl->packet_count[index] + 1;
317 tl->total = tl->total + 1;
318
319 if ((index + 1) > tl->queue_count)
320 tl->queue_count = index + 1;
321
322 return tid;
323 }
324
325 /*
326 get the traffic load value for tid
327 */
328 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
329 {
330 u32 curr_time = jiffies_to_msecs(jiffies);
331 u32 time_diff;
332 s32 index;
333 struct iwl_traffic_load *tl = NULL;
334
335 if (tid >= TID_MAX_LOAD_COUNT)
336 return 0;
337
338 tl = &(lq_data->load[tid]);
339
340 curr_time -= curr_time % TID_ROUND_VALUE;
341
342 if (!(tl->queue_count))
343 return 0;
344
345 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
346 index = time_diff / TID_QUEUE_CELL_SPACING;
347
348 /* The history is too long: remove data that is older than */
349 /* TID_MAX_TIME_DIFF */
350 if (index >= TID_QUEUE_MAX_SIZE)
351 rs_tl_rm_old_stats(tl, curr_time);
352
353 return tl->total;
354 }
355
356 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
357 struct iwl_lq_sta *lq_data, u8 tid,
358 struct ieee80211_sta *sta)
359 {
360 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
361 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
362 sta->addr, tid);
363 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
364 }
365 }
366
367 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
368 struct iwl_lq_sta *lq_data,
369 struct ieee80211_sta *sta)
370 {
371 if ((tid < TID_MAX_LOAD_COUNT))
372 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
373 else if (tid == IWL_AGG_ALL_TID)
374 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
375 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
376 }
377
378 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
379 {
380 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
381 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
382 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
383 }
384
385 /**
386 * rs_collect_tx_data - Update the success/failure sliding window
387 *
388 * We keep a sliding window of the last 62 packets transmitted
389 * at this rate. window->data contains the bitmask of successful
390 * packets.
391 */
392 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
393 int scale_index, s32 tpt, int retries,
394 int successes)
395 {
396 struct iwl_rate_scale_data *window = NULL;
397 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
398 s32 fail_count;
399
400 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
401 return -EINVAL;
402
403 /* Select data for current tx bit rate */
404 window = &(windows[scale_index]);
405
406 /*
407 * Keep track of only the latest 62 tx frame attempts in this rate's
408 * history window; anything older isn't really relevant any more.
409 * If we have filled up the sliding window, drop the oldest attempt;
410 * if the oldest attempt (highest bit in bitmap) shows "success",
411 * subtract "1" from the success counter (this is the main reason
412 * we keep these bitmaps!).
413 */
414 while (retries > 0) {
415 if (window->counter >= IWL_RATE_MAX_WINDOW) {
416
417 /* remove earliest */
418 window->counter = IWL_RATE_MAX_WINDOW - 1;
419
420 if (window->data & mask) {
421 window->data &= ~mask;
422 window->success_counter--;
423 }
424 }
425
426 /* Increment frames-attempted counter */
427 window->counter++;
428
429 /* Shift bitmap by one frame (throw away oldest history),
430 * OR in "1", and increment "success" if this
431 * frame was successful. */
432 window->data <<= 1;
433 if (successes > 0) {
434 window->success_counter++;
435 window->data |= 0x1;
436 successes--;
437 }
438
439 retries--;
440 }
441
442 /* Calculate current success ratio, avoid divide-by-0! */
443 if (window->counter > 0)
444 window->success_ratio = 128 * (100 * window->success_counter)
445 / window->counter;
446 else
447 window->success_ratio = IWL_INVALID_VALUE;
448
449 fail_count = window->counter - window->success_counter;
450
451 /* Calculate average throughput, if we have enough history. */
452 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
453 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
454 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
455 else
456 window->average_tpt = IWL_INVALID_VALUE;
457
458 /* Tag this window as having been updated */
459 window->stamp = jiffies;
460
461 return 0;
462 }
463
464 /*
465 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
466 */
467 /* FIXME:RS:remove this function and put the flags statically in the table */
468 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
469 int index, u8 use_green)
470 {
471 u32 rate_n_flags = 0;
472
473 if (is_legacy(tbl->lq_type)) {
474 rate_n_flags = iwl_rates[index].plcp;
475 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
476 rate_n_flags |= RATE_MCS_CCK_MSK;
477
478 } else if (is_Ht(tbl->lq_type)) {
479 if (index > IWL_LAST_OFDM_RATE) {
480 IWL_ERROR("invalid HT rate index %d\n", index);
481 index = IWL_LAST_OFDM_RATE;
482 }
483 rate_n_flags = RATE_MCS_HT_MSK;
484
485 if (is_siso(tbl->lq_type))
486 rate_n_flags |= iwl_rates[index].plcp_siso;
487 else if (is_mimo2(tbl->lq_type))
488 rate_n_flags |= iwl_rates[index].plcp_mimo2;
489 else
490 rate_n_flags |= iwl_rates[index].plcp_mimo3;
491 } else {
492 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
493 }
494
495 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
496 RATE_MCS_ANT_ABC_MSK);
497
498 if (is_Ht(tbl->lq_type)) {
499 if (tbl->is_fat) {
500 if (tbl->is_dup)
501 rate_n_flags |= RATE_MCS_DUP_MSK;
502 else
503 rate_n_flags |= RATE_MCS_FAT_MSK;
504 }
505 if (tbl->is_SGI)
506 rate_n_flags |= RATE_MCS_SGI_MSK;
507
508 if (use_green) {
509 rate_n_flags |= RATE_MCS_GF_MSK;
510 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
511 rate_n_flags &= ~RATE_MCS_SGI_MSK;
512 IWL_ERROR("GF was set with SGI:SISO\n");
513 }
514 }
515 }
516 return rate_n_flags;
517 }
518
519 /*
520 * Interpret uCode API's rate_n_flags format,
521 * fill "search" or "active" tx mode table.
522 */
523 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
524 enum ieee80211_band band,
525 struct iwl_scale_tbl_info *tbl,
526 int *rate_idx)
527 {
528 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
529 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
530 u8 mcs;
531
532 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
533
534 if (*rate_idx == IWL_RATE_INVALID) {
535 *rate_idx = -1;
536 return -EINVAL;
537 }
538 tbl->is_SGI = 0; /* default legacy setup */
539 tbl->is_fat = 0;
540 tbl->is_dup = 0;
541 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
542 tbl->lq_type = LQ_NONE;
543
544 /* legacy rate format */
545 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
546 if (num_of_ant == 1) {
547 if (band == IEEE80211_BAND_5GHZ)
548 tbl->lq_type = LQ_A;
549 else
550 tbl->lq_type = LQ_G;
551 }
552 /* HT rate format */
553 } else {
554 if (rate_n_flags & RATE_MCS_SGI_MSK)
555 tbl->is_SGI = 1;
556
557 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
558 (rate_n_flags & RATE_MCS_DUP_MSK))
559 tbl->is_fat = 1;
560
561 if (rate_n_flags & RATE_MCS_DUP_MSK)
562 tbl->is_dup = 1;
563
564 mcs = rs_extract_rate(rate_n_flags);
565
566 /* SISO */
567 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
568 if (num_of_ant == 1)
569 tbl->lq_type = LQ_SISO; /*else NONE*/
570 /* MIMO2 */
571 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
572 if (num_of_ant == 2)
573 tbl->lq_type = LQ_MIMO2;
574 /* MIMO3 */
575 } else {
576 if (num_of_ant == 3)
577 tbl->lq_type = LQ_MIMO3;
578 }
579 }
580 return 0;
581 }
582
583 /* switch to another antenna/antennas and return 1 */
584 /* if no other valid antenna found, return 0 */
585 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
586 struct iwl_scale_tbl_info *tbl)
587 {
588 u8 new_ant_type;
589
590 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
591 return 0;
592
593 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
594 return 0;
595
596 new_ant_type = ant_toggle_lookup[tbl->ant_type];
597
598 while ((new_ant_type != tbl->ant_type) &&
599 !rs_is_valid_ant(valid_ant, new_ant_type))
600 new_ant_type = ant_toggle_lookup[new_ant_type];
601
602 if (new_ant_type == tbl->ant_type)
603 return 0;
604
605 tbl->ant_type = new_ant_type;
606 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
607 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
608 return 1;
609 }
610
611 /* FIXME:RS: in 4965 we don't use greenfield at all */
612 /* FIXME:RS: don't use greenfield for now in TX */
613 #if 0
614 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
615 {
616 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
617 priv->current_ht_config.is_green_field &&
618 !priv->current_ht_config.non_GF_STA_present;
619 }
620 #endif
621 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
622 {
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 u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
634 struct ieee80211_hdr *hdr,
635 enum iwl_table_type rate_type)
636 {
637 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
638 lq_sta->active_rate_basic)
639 return lq_sta->active_rate_basic;
640
641 if (is_legacy(rate_type)) {
642 return lq_sta->active_legacy_rate;
643 } else {
644 if (is_siso(rate_type))
645 return lq_sta->active_siso_rate;
646 else if (is_mimo2(rate_type))
647 return lq_sta->active_mimo2_rate;
648 else
649 return lq_sta->active_mimo3_rate;
650 }
651 }
652
653 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
654 int rate_type)
655 {
656 u8 high = IWL_RATE_INVALID;
657 u8 low = IWL_RATE_INVALID;
658
659 /* 802.11A or ht walks to the next literal adjacent rate in
660 * the rate table */
661 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
662 int i;
663 u32 mask;
664
665 /* Find the previous rate that is in the rate mask */
666 i = index - 1;
667 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
668 if (rate_mask & mask) {
669 low = i;
670 break;
671 }
672 }
673
674 /* Find the next rate that is in the rate mask */
675 i = index + 1;
676 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
677 if (rate_mask & mask) {
678 high = i;
679 break;
680 }
681 }
682
683 return (high << 8) | low;
684 }
685
686 low = index;
687 while (low != IWL_RATE_INVALID) {
688 low = iwl_rates[low].prev_rs;
689 if (low == IWL_RATE_INVALID)
690 break;
691 if (rate_mask & (1 << low))
692 break;
693 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
694 }
695
696 high = index;
697 while (high != IWL_RATE_INVALID) {
698 high = iwl_rates[high].next_rs;
699 if (high == IWL_RATE_INVALID)
700 break;
701 if (rate_mask & (1 << high))
702 break;
703 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
704 }
705
706 return (high << 8) | low;
707 }
708
709 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
710 struct iwl_scale_tbl_info *tbl,
711 u8 scale_index, u8 ht_possible)
712 {
713 s32 low;
714 u16 rate_mask;
715 u16 high_low;
716 u8 switch_to_legacy = 0;
717 u8 is_green = lq_sta->is_green;
718
719 /* check if we need to switch from HT to legacy rates.
720 * assumption is that mandatory rates (1Mbps or 6Mbps)
721 * are always supported (spec demand) */
722 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
723 switch_to_legacy = 1;
724 scale_index = rs_ht_to_legacy[scale_index];
725 if (lq_sta->band == IEEE80211_BAND_5GHZ)
726 tbl->lq_type = LQ_A;
727 else
728 tbl->lq_type = LQ_G;
729
730 if (num_of_ant(tbl->ant_type) > 1)
731 tbl->ant_type = ANT_A;/*FIXME:RS*/
732
733 tbl->is_fat = 0;
734 tbl->is_SGI = 0;
735 }
736
737 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
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 low = scale_index;
752 goto out;
753 }
754
755 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
756 tbl->lq_type);
757 low = high_low & 0xff;
758
759 if (low == IWL_RATE_INVALID)
760 low = scale_index;
761
762 out:
763 return rate_n_flags_from_tbl(tbl, low, is_green);
764 }
765
766 /*
767 * mac80211 sends us Tx status
768 */
769 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
770 struct ieee80211_sta *sta, void *priv_sta,
771 struct sk_buff *skb)
772 {
773 int status;
774 u8 retries;
775 int rs_index, index = 0;
776 struct iwl_lq_sta *lq_sta;
777 struct iwl_link_quality_cmd *table;
778 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
779 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
780 struct ieee80211_hw *hw = priv->hw;
781 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
782 struct iwl_rate_scale_data *window = NULL;
783 struct iwl_rate_scale_data *search_win = NULL;
784 u32 tx_rate;
785 struct iwl_scale_tbl_info tbl_type;
786 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
787 u8 active_index = 0;
788 __le16 fc = hdr->frame_control;
789 s32 tpt = 0;
790
791 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
792
793 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
794 return;
795
796 /* This packet was aggregated but doesn't carry rate scale info */
797 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
798 !(info->flags & IEEE80211_TX_STAT_AMPDU))
799 return;
800
801 retries = info->status.rates[0].count - 1;
802
803 if (retries > 15)
804 retries = 15;
805
806 lq_sta = (struct iwl_lq_sta *)priv_sta;
807
808 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
809 !lq_sta->ibss_sta_added)
810 goto out;
811
812 table = &lq_sta->lq;
813 active_index = lq_sta->active_tbl;
814
815 curr_tbl = &(lq_sta->lq_info[active_index]);
816 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
817 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
818 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
819
820 /*
821 * Ignore this Tx frame response if its initial rate doesn't match
822 * that of latest Link Quality command. There may be stragglers
823 * from a previous Link Quality command, but we're no longer interested
824 * in those; they're either from the "active" mode while we're trying
825 * to check "search" mode, or a prior "search" mode after we've moved
826 * to a new "search" mode (which might become the new "active" mode).
827 */
828 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
829 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
830 if (priv->band == IEEE80211_BAND_5GHZ)
831 rs_index -= IWL_FIRST_OFDM_RATE;
832
833 if ((info->status.rates[0].idx < 0) ||
834 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
835 (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
836 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
837 (tbl_type.ant_type != info->antenna_sel_tx) ||
838 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
839 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
840 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
841 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
842 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
843 goto out;
844 }
845
846 /* Update frame history window with "failure" for each Tx retry. */
847 while (retries) {
848 /* Look up the rate and other info used for each tx attempt.
849 * Each tx attempt steps one entry deeper in the rate table. */
850 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
851 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
852 &tbl_type, &rs_index);
853
854 /* If type matches "search" table,
855 * add failure to "search" history */
856 if ((tbl_type.lq_type == search_tbl->lq_type) &&
857 (tbl_type.ant_type == search_tbl->ant_type) &&
858 (tbl_type.is_SGI == search_tbl->is_SGI)) {
859 if (search_tbl->expected_tpt)
860 tpt = search_tbl->expected_tpt[rs_index];
861 else
862 tpt = 0;
863 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
864
865 /* Else if type matches "current/active" table,
866 * add failure to "current/active" history */
867 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
868 (tbl_type.ant_type == curr_tbl->ant_type) &&
869 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
870 if (curr_tbl->expected_tpt)
871 tpt = curr_tbl->expected_tpt[rs_index];
872 else
873 tpt = 0;
874 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
875 }
876
877 /* If not searching for a new mode, increment failed counter
878 * ... this helps determine when to start searching again */
879 if (lq_sta->stay_in_tbl)
880 lq_sta->total_failed++;
881 --retries;
882 index++;
883
884 }
885
886 /*
887 * Find (by rate) the history window to update with final Tx attempt;
888 * if Tx was successful first try, use original rate,
889 * else look up the rate that was, finally, successful.
890 */
891 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
892 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
893
894 /* Update frame history window with "success" if Tx got ACKed ... */
895 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
896
897 /* If type matches "search" table,
898 * add final tx status to "search" history */
899 if ((tbl_type.lq_type == search_tbl->lq_type) &&
900 (tbl_type.ant_type == search_tbl->ant_type) &&
901 (tbl_type.is_SGI == search_tbl->is_SGI)) {
902 if (search_tbl->expected_tpt)
903 tpt = search_tbl->expected_tpt[rs_index];
904 else
905 tpt = 0;
906 if (info->flags & IEEE80211_TX_CTL_AMPDU)
907 rs_collect_tx_data(search_win, rs_index, tpt,
908 info->status.ampdu_ack_len,
909 info->status.ampdu_ack_map);
910 else
911 rs_collect_tx_data(search_win, rs_index, tpt,
912 1, status);
913 /* Else if type matches "current/active" table,
914 * add final tx status to "current/active" history */
915 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
916 (tbl_type.ant_type == curr_tbl->ant_type) &&
917 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
918 if (curr_tbl->expected_tpt)
919 tpt = curr_tbl->expected_tpt[rs_index];
920 else
921 tpt = 0;
922 if (info->flags & IEEE80211_TX_CTL_AMPDU)
923 rs_collect_tx_data(window, rs_index, tpt,
924 info->status.ampdu_ack_len,
925 info->status.ampdu_ack_map);
926 else
927 rs_collect_tx_data(window, rs_index, tpt,
928 1, status);
929 }
930
931 /* If not searching for new mode, increment success/failed counter
932 * ... these help determine when to start searching again */
933 if (lq_sta->stay_in_tbl) {
934 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
935 lq_sta->total_success += info->status.ampdu_ack_map;
936 lq_sta->total_failed +=
937 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
938 } else {
939 if (status)
940 lq_sta->total_success++;
941 else
942 lq_sta->total_failed++;
943 }
944 }
945
946 /* See if there's a better rate or modulation mode to try. */
947 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
948 out:
949 return;
950 }
951
952 /*
953 * Begin a period of staying with a selected modulation mode.
954 * Set "stay_in_tbl" flag to prevent any mode switches.
955 * Set frame tx success limits according to legacy vs. high-throughput,
956 * and reset overall (spanning all rates) tx success history statistics.
957 * These control how long we stay using same modulation mode before
958 * searching for a new mode.
959 */
960 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
961 struct iwl_lq_sta *lq_sta)
962 {
963 IWL_DEBUG_RATE("we are staying in the same table\n");
964 lq_sta->stay_in_tbl = 1; /* only place this gets set */
965 if (is_legacy) {
966 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
967 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
968 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
969 } else {
970 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
971 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
972 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
973 }
974 lq_sta->table_count = 0;
975 lq_sta->total_failed = 0;
976 lq_sta->total_success = 0;
977 }
978
979 /*
980 * Find correct throughput table for given mode of modulation
981 */
982 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
983 struct iwl_scale_tbl_info *tbl)
984 {
985 if (is_legacy(tbl->lq_type)) {
986 if (!is_a_band(tbl->lq_type))
987 tbl->expected_tpt = expected_tpt_G;
988 else
989 tbl->expected_tpt = expected_tpt_A;
990 } else if (is_siso(tbl->lq_type)) {
991 if (tbl->is_fat && !lq_sta->is_dup)
992 if (tbl->is_SGI)
993 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
994 else
995 tbl->expected_tpt = expected_tpt_siso40MHz;
996 else if (tbl->is_SGI)
997 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
998 else
999 tbl->expected_tpt = expected_tpt_siso20MHz;
1000
1001 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1002 if (tbl->is_fat && !lq_sta->is_dup)
1003 if (tbl->is_SGI)
1004 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1005 else
1006 tbl->expected_tpt = expected_tpt_mimo40MHz;
1007 else if (tbl->is_SGI)
1008 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1009 else
1010 tbl->expected_tpt = expected_tpt_mimo20MHz;
1011 } else
1012 tbl->expected_tpt = expected_tpt_G;
1013 }
1014
1015 /*
1016 * Find starting rate for new "search" high-throughput mode of modulation.
1017 * Goal is to find lowest expected rate (under perfect conditions) that is
1018 * above the current measured throughput of "active" mode, to give new mode
1019 * a fair chance to prove itself without too many challenges.
1020 *
1021 * This gets called when transitioning to more aggressive modulation
1022 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1023 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1024 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1025 * bit rate will typically need to increase, but not if performance was bad.
1026 */
1027 static s32 rs_get_best_rate(struct iwl_priv *priv,
1028 struct iwl_lq_sta *lq_sta,
1029 struct iwl_scale_tbl_info *tbl, /* "search" */
1030 u16 rate_mask, s8 index)
1031 {
1032 /* "active" values */
1033 struct iwl_scale_tbl_info *active_tbl =
1034 &(lq_sta->lq_info[lq_sta->active_tbl]);
1035 s32 active_sr = active_tbl->win[index].success_ratio;
1036 s32 active_tpt = active_tbl->expected_tpt[index];
1037
1038 /* expected "search" throughput */
1039 s32 *tpt_tbl = tbl->expected_tpt;
1040
1041 s32 new_rate, high, low, start_hi;
1042 u16 high_low;
1043 s8 rate = index;
1044
1045 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1046
1047 for (; ;) {
1048 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1049 tbl->lq_type);
1050
1051 low = high_low & 0xff;
1052 high = (high_low >> 8) & 0xff;
1053
1054 /*
1055 * Lower the "search" bit rate, to give new "search" mode
1056 * approximately the same throughput as "active" if:
1057 *
1058 * 1) "Active" mode has been working modestly well (but not
1059 * great), and expected "search" throughput (under perfect
1060 * conditions) at candidate rate is above the actual
1061 * measured "active" throughput (but less than expected
1062 * "active" throughput under perfect conditions).
1063 * OR
1064 * 2) "Active" mode has been working perfectly or very well
1065 * and expected "search" throughput (under perfect
1066 * conditions) at candidate rate is above expected
1067 * "active" throughput (under perfect conditions).
1068 */
1069 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1070 ((active_sr > IWL_RATE_DECREASE_TH) &&
1071 (active_sr <= IWL_RATE_HIGH_TH) &&
1072 (tpt_tbl[rate] <= active_tpt))) ||
1073 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1074 (tpt_tbl[rate] > active_tpt))) {
1075
1076 /* (2nd or later pass)
1077 * If we've already tried to raise the rate, and are
1078 * now trying to lower it, use the higher rate. */
1079 if (start_hi != IWL_RATE_INVALID) {
1080 new_rate = start_hi;
1081 break;
1082 }
1083
1084 new_rate = rate;
1085
1086 /* Loop again with lower rate */
1087 if (low != IWL_RATE_INVALID)
1088 rate = low;
1089
1090 /* Lower rate not available, use the original */
1091 else
1092 break;
1093
1094 /* Else try to raise the "search" rate to match "active" */
1095 } else {
1096 /* (2nd or later pass)
1097 * If we've already tried to lower the rate, and are
1098 * now trying to raise it, use the lower rate. */
1099 if (new_rate != IWL_RATE_INVALID)
1100 break;
1101
1102 /* Loop again with higher rate */
1103 else if (high != IWL_RATE_INVALID) {
1104 start_hi = high;
1105 rate = high;
1106
1107 /* Higher rate not available, use the original */
1108 } else {
1109 new_rate = rate;
1110 break;
1111 }
1112 }
1113 }
1114
1115 return new_rate;
1116 }
1117
1118 /*
1119 * Set up search table for MIMO
1120 */
1121 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1122 struct iwl_lq_sta *lq_sta,
1123 struct ieee80211_conf *conf,
1124 struct ieee80211_sta *sta,
1125 struct iwl_scale_tbl_info *tbl, int index)
1126 {
1127 u16 rate_mask;
1128 s32 rate;
1129 s8 is_green = lq_sta->is_green;
1130
1131 if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1132 return -1;
1133
1134 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1135 == WLAN_HT_CAP_SM_PS_STATIC)
1136 return -1;
1137
1138 /* Need both Tx chains/antennas to support MIMO */
1139 if (priv->hw_params.tx_chains_num < 2)
1140 return -1;
1141
1142 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1143
1144 tbl->lq_type = LQ_MIMO2;
1145 tbl->is_dup = lq_sta->is_dup;
1146 tbl->action = 0;
1147 rate_mask = lq_sta->active_mimo2_rate;
1148
1149 if (priv->current_ht_config.supported_chan_width
1150 == IWL_CHANNEL_WIDTH_40MHZ)
1151 tbl->is_fat = 1;
1152 else
1153 tbl->is_fat = 0;
1154
1155 /* FIXME: - don't toggle SGI here
1156 if (tbl->is_fat) {
1157 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1158 tbl->is_SGI = 1;
1159 else
1160 tbl->is_SGI = 0;
1161 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1162 tbl->is_SGI = 1;
1163 else
1164 tbl->is_SGI = 0;
1165 */
1166
1167 rs_set_expected_tpt_table(lq_sta, tbl);
1168
1169 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1170
1171 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1172
1173 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1174 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1175 rate, rate_mask);
1176 return -1;
1177 }
1178 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1179
1180 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1181 tbl->current_rate, is_green);
1182 return 0;
1183 }
1184
1185 /*
1186 * Set up search table for SISO
1187 */
1188 static int rs_switch_to_siso(struct iwl_priv *priv,
1189 struct iwl_lq_sta *lq_sta,
1190 struct ieee80211_conf *conf,
1191 struct ieee80211_sta *sta,
1192 struct iwl_scale_tbl_info *tbl, int index)
1193 {
1194 u16 rate_mask;
1195 u8 is_green = lq_sta->is_green;
1196 s32 rate;
1197
1198 if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1199 return -1;
1200
1201 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1202
1203 tbl->is_dup = lq_sta->is_dup;
1204 tbl->lq_type = LQ_SISO;
1205 tbl->action = 0;
1206 rate_mask = lq_sta->active_siso_rate;
1207
1208 if (priv->current_ht_config.supported_chan_width
1209 == IWL_CHANNEL_WIDTH_40MHZ)
1210 tbl->is_fat = 1;
1211 else
1212 tbl->is_fat = 0;
1213
1214 /* FIXME: - don't toggle SGI here
1215 if (tbl->is_fat) {
1216 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1217 tbl->is_SGI = 1;
1218 else
1219 tbl->is_SGI = 0;
1220 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1221 tbl->is_SGI = 1;
1222 else
1223 tbl->is_SGI = 0;
1224 */
1225
1226 if (is_green)
1227 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1228
1229 rs_set_expected_tpt_table(lq_sta, tbl);
1230 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1231
1232 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1233 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1234 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1235 rate, rate_mask);
1236 return -1;
1237 }
1238 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1239 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1240 tbl->current_rate, is_green);
1241 return 0;
1242 }
1243
1244 /*
1245 * Try to switch to new modulation mode from legacy
1246 */
1247 static int rs_move_legacy_other(struct iwl_priv *priv,
1248 struct iwl_lq_sta *lq_sta,
1249 struct ieee80211_conf *conf,
1250 struct ieee80211_sta *sta,
1251 int index)
1252 {
1253 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1254 struct iwl_scale_tbl_info *search_tbl =
1255 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1256 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1257 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1258 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1259 u8 start_action = tbl->action;
1260 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1261 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1262 int ret = 0;
1263
1264 for (; ;) {
1265 switch (tbl->action) {
1266 case IWL_LEGACY_SWITCH_ANTENNA1:
1267 case IWL_LEGACY_SWITCH_ANTENNA2:
1268 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1269
1270 lq_sta->action_counter++;
1271
1272 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1273 tx_chains_num <= 1) ||
1274 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1275 tx_chains_num <= 2))
1276 break;
1277
1278 /* Don't change antenna if success has been great */
1279 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1280 break;
1281
1282 /* Set up search table to try other antenna */
1283 memcpy(search_tbl, tbl, sz);
1284
1285 if (rs_toggle_antenna(valid_tx_ant,
1286 &search_tbl->current_rate, search_tbl)) {
1287 rs_set_expected_tpt_table(lq_sta, search_tbl);
1288 goto out;
1289 }
1290 break;
1291 case IWL_LEGACY_SWITCH_SISO:
1292 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1293
1294 /* Set up search table to try SISO */
1295 memcpy(search_tbl, tbl, sz);
1296 search_tbl->is_SGI = 0;
1297 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1298 search_tbl, index);
1299 if (!ret) {
1300 lq_sta->action_counter = 0;
1301 goto out;
1302 }
1303
1304 break;
1305 case IWL_LEGACY_SWITCH_MIMO2_AB:
1306 case IWL_LEGACY_SWITCH_MIMO2_AC:
1307 case IWL_LEGACY_SWITCH_MIMO2_BC:
1308 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1309
1310 /* Set up search table to try MIMO */
1311 memcpy(search_tbl, tbl, sz);
1312 search_tbl->is_SGI = 0;
1313
1314 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1315 search_tbl->ant_type = ANT_AB;
1316 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1317 search_tbl->ant_type = ANT_AC;
1318 else
1319 search_tbl->ant_type = ANT_BC;
1320
1321 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1322 break;
1323
1324 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1325 search_tbl, index);
1326 if (!ret) {
1327 lq_sta->action_counter = 0;
1328 goto out;
1329 }
1330 break;
1331 }
1332 tbl->action++;
1333 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1334 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1335
1336 if (tbl->action == start_action)
1337 break;
1338
1339 }
1340 search_tbl->lq_type = LQ_NONE;
1341 return 0;
1342
1343 out:
1344 lq_sta->search_better_tbl = 1;
1345 tbl->action++;
1346 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1347 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1348 return 0;
1349
1350 }
1351
1352 /*
1353 * Try to switch to new modulation mode from SISO
1354 */
1355 static int rs_move_siso_to_other(struct iwl_priv *priv,
1356 struct iwl_lq_sta *lq_sta,
1357 struct ieee80211_conf *conf,
1358 struct ieee80211_sta *sta, int index)
1359 {
1360 u8 is_green = lq_sta->is_green;
1361 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1362 struct iwl_scale_tbl_info *search_tbl =
1363 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1364 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1365 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1366 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1367 u8 start_action = tbl->action;
1368 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1369 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1370 int ret;
1371
1372 for (;;) {
1373 lq_sta->action_counter++;
1374 switch (tbl->action) {
1375 case IWL_SISO_SWITCH_ANTENNA1:
1376 case IWL_SISO_SWITCH_ANTENNA2:
1377 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1378
1379 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1380 tx_chains_num <= 1) ||
1381 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1382 tx_chains_num <= 2))
1383 break;
1384
1385 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1386 break;
1387
1388 memcpy(search_tbl, tbl, sz);
1389 if (rs_toggle_antenna(valid_tx_ant,
1390 &search_tbl->current_rate, search_tbl))
1391 goto out;
1392 break;
1393 case IWL_SISO_SWITCH_MIMO2_AB:
1394 case IWL_SISO_SWITCH_MIMO2_AC:
1395 case IWL_SISO_SWITCH_MIMO2_BC:
1396 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1397 memcpy(search_tbl, tbl, sz);
1398 search_tbl->is_SGI = 0;
1399
1400 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1401 search_tbl->ant_type = ANT_AB;
1402 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1403 search_tbl->ant_type = ANT_AC;
1404 else
1405 search_tbl->ant_type = ANT_BC;
1406
1407 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1408 break;
1409
1410 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1411 search_tbl, index);
1412 if (!ret)
1413 goto out;
1414 break;
1415 case IWL_SISO_SWITCH_GI:
1416 if (!tbl->is_fat &&
1417 !(priv->current_ht_config.sgf &
1418 HT_SHORT_GI_20MHZ))
1419 break;
1420 if (tbl->is_fat &&
1421 !(priv->current_ht_config.sgf &
1422 HT_SHORT_GI_40MHZ))
1423 break;
1424
1425 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1426
1427 memcpy(search_tbl, tbl, sz);
1428 if (is_green) {
1429 if (!tbl->is_SGI)
1430 break;
1431 else
1432 IWL_ERROR("SGI was set in GF+SISO\n");
1433 }
1434 search_tbl->is_SGI = !tbl->is_SGI;
1435 rs_set_expected_tpt_table(lq_sta, search_tbl);
1436 if (tbl->is_SGI) {
1437 s32 tpt = lq_sta->last_tpt / 100;
1438 if (tpt >= search_tbl->expected_tpt[index])
1439 break;
1440 }
1441 search_tbl->current_rate = rate_n_flags_from_tbl(
1442 search_tbl, index, is_green);
1443 goto out;
1444 }
1445 tbl->action++;
1446 if (tbl->action > IWL_SISO_SWITCH_GI)
1447 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1448
1449 if (tbl->action == start_action)
1450 break;
1451 }
1452 search_tbl->lq_type = LQ_NONE;
1453 return 0;
1454
1455 out:
1456 lq_sta->search_better_tbl = 1;
1457 tbl->action++;
1458 if (tbl->action > IWL_SISO_SWITCH_GI)
1459 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1460 return 0;
1461 }
1462
1463 /*
1464 * Try to switch to new modulation mode from MIMO
1465 */
1466 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1467 struct iwl_lq_sta *lq_sta,
1468 struct ieee80211_conf *conf,
1469 struct ieee80211_sta *sta, int index)
1470 {
1471 s8 is_green = lq_sta->is_green;
1472 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1473 struct iwl_scale_tbl_info *search_tbl =
1474 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1475 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1476 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1477 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1478 u8 start_action = tbl->action;
1479 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1480 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1481 int ret;
1482
1483 for (;;) {
1484 lq_sta->action_counter++;
1485 switch (tbl->action) {
1486 case IWL_MIMO2_SWITCH_ANTENNA1:
1487 case IWL_MIMO2_SWITCH_ANTENNA2:
1488 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1489
1490 if (tx_chains_num <= 2)
1491 break;
1492
1493 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1494 break;
1495
1496 memcpy(search_tbl, tbl, sz);
1497 if (rs_toggle_antenna(valid_tx_ant,
1498 &search_tbl->current_rate, search_tbl))
1499 goto out;
1500 break;
1501 case IWL_MIMO2_SWITCH_SISO_A:
1502 case IWL_MIMO2_SWITCH_SISO_B:
1503 case IWL_MIMO2_SWITCH_SISO_C:
1504 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1505
1506 /* Set up new search table for SISO */
1507 memcpy(search_tbl, tbl, sz);
1508
1509 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1510 search_tbl->ant_type = ANT_A;
1511 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1512 search_tbl->ant_type = ANT_B;
1513 else
1514 search_tbl->ant_type = ANT_C;
1515
1516 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1517 break;
1518
1519 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1520 search_tbl, index);
1521 if (!ret)
1522 goto out;
1523
1524 break;
1525
1526 case IWL_MIMO2_SWITCH_GI:
1527 if (!tbl->is_fat &&
1528 !(priv->current_ht_config.sgf &
1529 HT_SHORT_GI_20MHZ))
1530 break;
1531 if (tbl->is_fat &&
1532 !(priv->current_ht_config.sgf &
1533 HT_SHORT_GI_40MHZ))
1534 break;
1535
1536 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1537
1538 /* Set up new search table for MIMO */
1539 memcpy(search_tbl, tbl, sz);
1540 search_tbl->is_SGI = !tbl->is_SGI;
1541 rs_set_expected_tpt_table(lq_sta, search_tbl);
1542 /*
1543 * If active table already uses the fastest possible
1544 * modulation (dual stream with short guard interval),
1545 * and it's working well, there's no need to look
1546 * for a better type of modulation!
1547 */
1548 if (tbl->is_SGI) {
1549 s32 tpt = lq_sta->last_tpt / 100;
1550 if (tpt >= search_tbl->expected_tpt[index])
1551 break;
1552 }
1553 search_tbl->current_rate = rate_n_flags_from_tbl(
1554 search_tbl, index, is_green);
1555 goto out;
1556
1557 }
1558 tbl->action++;
1559 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1560 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1561
1562 if (tbl->action == start_action)
1563 break;
1564 }
1565 search_tbl->lq_type = LQ_NONE;
1566 return 0;
1567 out:
1568 lq_sta->search_better_tbl = 1;
1569 tbl->action++;
1570 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1571 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1572 return 0;
1573
1574 }
1575
1576 /*
1577 * Check whether we should continue using same modulation mode, or
1578 * begin search for a new mode, based on:
1579 * 1) # tx successes or failures while using this mode
1580 * 2) # times calling this function
1581 * 3) elapsed time in this mode (not used, for now)
1582 */
1583 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1584 {
1585 struct iwl_scale_tbl_info *tbl;
1586 int i;
1587 int active_tbl;
1588 int flush_interval_passed = 0;
1589 struct iwl_priv *priv;
1590
1591 priv = lq_sta->drv;
1592 active_tbl = lq_sta->active_tbl;
1593
1594 tbl = &(lq_sta->lq_info[active_tbl]);
1595
1596 /* If we've been disallowing search, see if we should now allow it */
1597 if (lq_sta->stay_in_tbl) {
1598
1599 /* Elapsed time using current modulation mode */
1600 if (lq_sta->flush_timer)
1601 flush_interval_passed =
1602 time_after(jiffies,
1603 (unsigned long)(lq_sta->flush_timer +
1604 IWL_RATE_SCALE_FLUSH_INTVL));
1605
1606 /*
1607 * Check if we should allow search for new modulation mode.
1608 * If many frames have failed or succeeded, or we've used
1609 * this same modulation for a long time, allow search, and
1610 * reset history stats that keep track of whether we should
1611 * allow a new search. Also (below) reset all bitmaps and
1612 * stats in active history.
1613 */
1614 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1615 (lq_sta->total_success > lq_sta->max_success_limit) ||
1616 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1617 && (flush_interval_passed))) {
1618 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1619 lq_sta->total_failed,
1620 lq_sta->total_success,
1621 flush_interval_passed);
1622
1623 /* Allow search for new mode */
1624 lq_sta->stay_in_tbl = 0; /* only place reset */
1625 lq_sta->total_failed = 0;
1626 lq_sta->total_success = 0;
1627 lq_sta->flush_timer = 0;
1628
1629 /*
1630 * Else if we've used this modulation mode enough repetitions
1631 * (regardless of elapsed time or success/failure), reset
1632 * history bitmaps and rate-specific stats for all rates in
1633 * active table.
1634 */
1635 } else {
1636 lq_sta->table_count++;
1637 if (lq_sta->table_count >=
1638 lq_sta->table_count_limit) {
1639 lq_sta->table_count = 0;
1640
1641 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1642 for (i = 0; i < IWL_RATE_COUNT; i++)
1643 rs_rate_scale_clear_window(
1644 &(tbl->win[i]));
1645 }
1646 }
1647
1648 /* If transitioning to allow "search", reset all history
1649 * bitmaps and stats in active table (this will become the new
1650 * "search" table). */
1651 if (!lq_sta->stay_in_tbl) {
1652 for (i = 0; i < IWL_RATE_COUNT; i++)
1653 rs_rate_scale_clear_window(&(tbl->win[i]));
1654 }
1655 }
1656 }
1657
1658 /*
1659 * Do rate scaling and search for new modulation mode.
1660 */
1661 static void rs_rate_scale_perform(struct iwl_priv *priv,
1662 struct ieee80211_hdr *hdr,
1663 struct ieee80211_sta *sta,
1664 struct iwl_lq_sta *lq_sta)
1665 {
1666 struct ieee80211_hw *hw = priv->hw;
1667 struct ieee80211_conf *conf = &hw->conf;
1668 int low = IWL_RATE_INVALID;
1669 int high = IWL_RATE_INVALID;
1670 int index;
1671 int i;
1672 struct iwl_rate_scale_data *window = NULL;
1673 int current_tpt = IWL_INVALID_VALUE;
1674 int low_tpt = IWL_INVALID_VALUE;
1675 int high_tpt = IWL_INVALID_VALUE;
1676 u32 fail_count;
1677 s8 scale_action = 0;
1678 __le16 fc;
1679 u16 rate_mask;
1680 u8 update_lq = 0;
1681 struct iwl_scale_tbl_info *tbl, *tbl1;
1682 u16 rate_scale_index_msk = 0;
1683 u32 rate;
1684 u8 is_green = 0;
1685 u8 active_tbl = 0;
1686 u8 done_search = 0;
1687 u16 high_low;
1688 s32 sr;
1689 u8 tid = MAX_TID_COUNT;
1690
1691 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1692
1693 fc = hdr->frame_control;
1694 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1695 /* Send management frames and broadcast/multicast data using
1696 * lowest rate. */
1697 /* TODO: this could probably be improved.. */
1698 return;
1699 }
1700
1701 if (!sta || !lq_sta)
1702 return;
1703
1704 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1705
1706 tid = rs_tl_add_packet(lq_sta, hdr);
1707
1708 /*
1709 * Select rate-scale / modulation-mode table to work with in
1710 * the rest of this function: "search" if searching for better
1711 * modulation mode, or "active" if doing rate scaling within a mode.
1712 */
1713 if (!lq_sta->search_better_tbl)
1714 active_tbl = lq_sta->active_tbl;
1715 else
1716 active_tbl = 1 - lq_sta->active_tbl;
1717
1718 tbl = &(lq_sta->lq_info[active_tbl]);
1719 is_green = lq_sta->is_green;
1720
1721 /* current tx rate */
1722 index = lq_sta->last_txrate_idx;
1723
1724 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1725 tbl->lq_type);
1726
1727 /* rates available for this association, and for modulation mode */
1728 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1729
1730 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1731
1732 /* mask with station rate restriction */
1733 if (is_legacy(tbl->lq_type)) {
1734 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1735 /* supp_rates has no CCK bits in A mode */
1736 rate_scale_index_msk = (u16) (rate_mask &
1737 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1738 else
1739 rate_scale_index_msk = (u16) (rate_mask &
1740 lq_sta->supp_rates);
1741
1742 } else
1743 rate_scale_index_msk = rate_mask;
1744
1745 if (!rate_scale_index_msk)
1746 rate_scale_index_msk = rate_mask;
1747
1748 if (!((1 << index) & rate_scale_index_msk)) {
1749 IWL_ERROR("Current Rate is not valid\n");
1750 return;
1751 }
1752
1753 /* Get expected throughput table and history window for current rate */
1754 if (!tbl->expected_tpt) {
1755 IWL_ERROR("tbl->expected_tpt is NULL\n");
1756 return;
1757 }
1758
1759 window = &(tbl->win[index]);
1760
1761 /*
1762 * If there is not enough history to calculate actual average
1763 * throughput, keep analyzing results of more tx frames, without
1764 * changing rate or mode (bypass most of the rest of this function).
1765 * Set up new rate table in uCode only if old rate is not supported
1766 * in current association (use new rate found above).
1767 */
1768 fail_count = window->counter - window->success_counter;
1769 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1770 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1771 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1772 "for index %d\n",
1773 window->success_counter, window->counter, index);
1774
1775 /* Can't calculate this yet; not enough history */
1776 window->average_tpt = IWL_INVALID_VALUE;
1777
1778 /* Should we stay with this modulation mode,
1779 * or search for a new one? */
1780 rs_stay_in_table(lq_sta);
1781
1782 goto out;
1783 }
1784
1785 /* Else we have enough samples; calculate estimate of
1786 * actual average throughput */
1787
1788 BUG_ON(window->average_tpt != ((window->success_ratio *
1789 tbl->expected_tpt[index] + 64) / 128));
1790
1791 /* If we are searching for better modulation mode, check success. */
1792 if (lq_sta->search_better_tbl) {
1793
1794 /* If good success, continue using the "search" mode;
1795 * no need to send new link quality command, since we're
1796 * continuing to use the setup that we've been trying. */
1797 if (window->average_tpt > lq_sta->last_tpt) {
1798
1799 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1800 "suc=%d cur-tpt=%d old-tpt=%d\n",
1801 window->success_ratio,
1802 window->average_tpt,
1803 lq_sta->last_tpt);
1804
1805 if (!is_legacy(tbl->lq_type))
1806 lq_sta->enable_counter = 1;
1807
1808 /* Swap tables; "search" becomes "active" */
1809 lq_sta->active_tbl = active_tbl;
1810 current_tpt = window->average_tpt;
1811
1812 /* Else poor success; go back to mode in "active" table */
1813 } else {
1814
1815 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1816 "suc=%d cur-tpt=%d old-tpt=%d\n",
1817 window->success_ratio,
1818 window->average_tpt,
1819 lq_sta->last_tpt);
1820
1821 /* Nullify "search" table */
1822 tbl->lq_type = LQ_NONE;
1823
1824 /* Revert to "active" table */
1825 active_tbl = lq_sta->active_tbl;
1826 tbl = &(lq_sta->lq_info[active_tbl]);
1827
1828 /* Revert to "active" rate and throughput info */
1829 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1830 current_tpt = lq_sta->last_tpt;
1831
1832 /* Need to set up a new rate table in uCode */
1833 update_lq = 1;
1834 }
1835
1836 /* Either way, we've made a decision; modulation mode
1837 * search is done, allow rate adjustment next time. */
1838 lq_sta->search_better_tbl = 0;
1839 done_search = 1; /* Don't switch modes below! */
1840 goto lq_update;
1841 }
1842
1843 /* (Else) not in search of better modulation mode, try for better
1844 * starting rate, while staying in this mode. */
1845 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1846 tbl->lq_type);
1847 low = high_low & 0xff;
1848 high = (high_low >> 8) & 0xff;
1849
1850 sr = window->success_ratio;
1851
1852 /* Collect measured throughputs for current and adjacent rates */
1853 current_tpt = window->average_tpt;
1854 if (low != IWL_RATE_INVALID)
1855 low_tpt = tbl->win[low].average_tpt;
1856 if (high != IWL_RATE_INVALID)
1857 high_tpt = tbl->win[high].average_tpt;
1858
1859 scale_action = 0;
1860
1861 /* Too many failures, decrease rate */
1862 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1863 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1864 scale_action = -1;
1865
1866 /* No throughput measured yet for adjacent rates; try increase. */
1867 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1868 (high_tpt == IWL_INVALID_VALUE)) {
1869
1870 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1871 scale_action = 1;
1872 else if (low != IWL_RATE_INVALID)
1873 scale_action = -1;
1874 }
1875
1876 /* Both adjacent throughputs are measured, but neither one has better
1877 * throughput; we're using the best rate, don't change it! */
1878 else if ((low_tpt != IWL_INVALID_VALUE) &&
1879 (high_tpt != IWL_INVALID_VALUE) &&
1880 (low_tpt < current_tpt) &&
1881 (high_tpt < current_tpt))
1882 scale_action = 0;
1883
1884 /* At least one adjacent rate's throughput is measured,
1885 * and may have better performance. */
1886 else {
1887 /* Higher adjacent rate's throughput is measured */
1888 if (high_tpt != IWL_INVALID_VALUE) {
1889 /* Higher rate has better throughput */
1890 if (high_tpt > current_tpt &&
1891 sr >= IWL_RATE_INCREASE_TH) {
1892 scale_action = 1;
1893 } else {
1894 IWL_DEBUG_RATE
1895 ("decrease rate because of high tpt\n");
1896 scale_action = -1;
1897 }
1898
1899 /* Lower adjacent rate's throughput is measured */
1900 } else if (low_tpt != IWL_INVALID_VALUE) {
1901 /* Lower rate has better throughput */
1902 if (low_tpt > current_tpt) {
1903 IWL_DEBUG_RATE
1904 ("decrease rate because of low tpt\n");
1905 scale_action = -1;
1906 } else if (sr >= IWL_RATE_INCREASE_TH) {
1907 scale_action = 1;
1908 }
1909 }
1910 }
1911
1912 /* Sanity check; asked for decrease, but success rate or throughput
1913 * has been good at old rate. Don't change it. */
1914 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1915 ((sr > IWL_RATE_HIGH_TH) ||
1916 (current_tpt > (100 * tbl->expected_tpt[low]))))
1917 scale_action = 0;
1918
1919 switch (scale_action) {
1920 case -1:
1921 /* Decrease starting rate, update uCode's rate table */
1922 if (low != IWL_RATE_INVALID) {
1923 update_lq = 1;
1924 index = low;
1925 }
1926 break;
1927 case 1:
1928 /* Increase starting rate, update uCode's rate table */
1929 if (high != IWL_RATE_INVALID) {
1930 update_lq = 1;
1931 index = high;
1932 }
1933
1934 break;
1935 case 0:
1936 /* No change */
1937 default:
1938 break;
1939 }
1940
1941 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1942 "high %d type %d\n",
1943 index, scale_action, low, high, tbl->lq_type);
1944
1945 lq_update:
1946 /* Replace uCode's rate table for the destination station. */
1947 if (update_lq) {
1948 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1949 rs_fill_link_cmd(priv, lq_sta, rate);
1950 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1951 }
1952
1953 /* Should we stay with this modulation mode, or search for a new one? */
1954 rs_stay_in_table(lq_sta);
1955
1956 /*
1957 * Search for new modulation mode if we're:
1958 * 1) Not changing rates right now
1959 * 2) Not just finishing up a search
1960 * 3) Allowing a new search
1961 */
1962 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1963 /* Save current throughput to compare with "search" throughput*/
1964 lq_sta->last_tpt = current_tpt;
1965
1966 /* Select a new "search" modulation mode to try.
1967 * If one is found, set up the new "search" table. */
1968 if (is_legacy(tbl->lq_type))
1969 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1970 else if (is_siso(tbl->lq_type))
1971 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1972 else
1973 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1974
1975 /* If new "search" mode was selected, set up in uCode table */
1976 if (lq_sta->search_better_tbl) {
1977 /* Access the "search" table, clear its history. */
1978 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1979 for (i = 0; i < IWL_RATE_COUNT; i++)
1980 rs_rate_scale_clear_window(&(tbl->win[i]));
1981
1982 /* Use new "search" start rate */
1983 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1984
1985 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1986 tbl->current_rate, index);
1987 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1988 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1989 }
1990
1991 /* If the "active" (non-search) mode was legacy,
1992 * and we've tried switching antennas,
1993 * but we haven't been able to try HT modes (not available),
1994 * stay with best antenna legacy modulation for a while
1995 * before next round of mode comparisons. */
1996 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1997 if (is_legacy(tbl1->lq_type) && !conf->ht.enabled &&
1998 lq_sta->action_counter >= 1) {
1999 lq_sta->action_counter = 0;
2000 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2001 rs_set_stay_in_table(priv, 1, lq_sta);
2002 }
2003
2004 /* If we're in an HT mode, and all 3 mode switch actions
2005 * have been tried and compared, stay in this best modulation
2006 * mode for a while before next round of mode comparisons. */
2007 if (lq_sta->enable_counter &&
2008 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2009 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2010 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2011 (tid != MAX_TID_COUNT)) {
2012 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2013 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2014 }
2015 lq_sta->action_counter = 0;
2016 rs_set_stay_in_table(priv, 0, lq_sta);
2017 }
2018
2019 /*
2020 * Else, don't search for a new modulation mode.
2021 * Put new timestamp in stay-in-modulation-mode flush timer if:
2022 * 1) Not changing rates right now
2023 * 2) Not just finishing up a search
2024 * 3) flush timer is empty
2025 */
2026 } else {
2027 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2028 lq_sta->flush_timer = jiffies;
2029 }
2030
2031 out:
2032 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2033 i = index;
2034 lq_sta->last_txrate_idx = i;
2035
2036 return;
2037 }
2038
2039
2040 static void rs_initialize_lq(struct iwl_priv *priv,
2041 struct ieee80211_conf *conf,
2042 struct ieee80211_sta *sta,
2043 struct iwl_lq_sta *lq_sta)
2044 {
2045 struct iwl_scale_tbl_info *tbl;
2046 int rate_idx;
2047 int i;
2048 u32 rate;
2049 u8 use_green = rs_use_green(priv, conf);
2050 u8 active_tbl = 0;
2051 u8 valid_tx_ant;
2052
2053 if (!sta || !lq_sta)
2054 goto out;
2055
2056 i = lq_sta->last_txrate_idx;
2057
2058 if ((lq_sta->lq.sta_id == 0xff) &&
2059 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2060 goto out;
2061
2062 valid_tx_ant = priv->hw_params.valid_tx_ant;
2063
2064 if (!lq_sta->search_better_tbl)
2065 active_tbl = lq_sta->active_tbl;
2066 else
2067 active_tbl = 1 - lq_sta->active_tbl;
2068
2069 tbl = &(lq_sta->lq_info[active_tbl]);
2070
2071 if ((i < 0) || (i >= IWL_RATE_COUNT))
2072 i = 0;
2073
2074 /* FIXME:RS: This is also wrong in 4965 */
2075 rate = iwl_rates[i].plcp;
2076 rate |= RATE_MCS_ANT_B_MSK;
2077 rate &= ~RATE_MCS_ANT_A_MSK;
2078
2079 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2080 rate |= RATE_MCS_CCK_MSK;
2081
2082 tbl->ant_type = ANT_B;
2083 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2084 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2085 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2086
2087 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2088 tbl->current_rate = rate;
2089 rs_set_expected_tpt_table(lq_sta, tbl);
2090 rs_fill_link_cmd(NULL, lq_sta, rate);
2091 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2092 out:
2093 return;
2094 }
2095
2096 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2097 struct ieee80211_tx_rate_control *txrc)
2098 {
2099
2100 int i;
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 __le16 fc;
2108 struct iwl_lq_sta *lq_sta;
2109
2110 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2111
2112 /* Send management frames and broadcast/multicast data using lowest
2113 * rate. */
2114 fc = hdr->frame_control;
2115 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2116 !sta || !priv_sta) {
2117 info->control.rates[0].idx = rate_lowest_index(sband, sta);
2118 return;
2119 }
2120
2121 lq_sta = (struct iwl_lq_sta *)priv_sta;
2122 i = lq_sta->last_txrate_idx;
2123
2124 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2125 !lq_sta->ibss_sta_added) {
2126 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2127
2128 if (sta_id == IWL_INVALID_STATION) {
2129 IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2130 hdr->addr1);
2131 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2132 0, CMD_ASYNC, NULL);
2133 }
2134 if ((sta_id != IWL_INVALID_STATION)) {
2135 lq_sta->lq.sta_id = sta_id;
2136 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2137 lq_sta->ibss_sta_added = 1;
2138 rs_initialize_lq(priv, conf, sta, lq_sta);
2139 }
2140 }
2141
2142 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2143 info->control.rates[0].idx = rate_lowest_index(sband, sta);
2144 return;
2145 }
2146
2147 if (sband->band == IEEE80211_BAND_5GHZ)
2148 i -= IWL_FIRST_OFDM_RATE;
2149 info->control.rates[0].idx = i;
2150 }
2151
2152 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2153 gfp_t gfp)
2154 {
2155 struct iwl_lq_sta *lq_sta;
2156 struct iwl_priv *priv;
2157 int i, j;
2158
2159 priv = (struct iwl_priv *)priv_rate;
2160 IWL_DEBUG_RATE("create station rate scale window\n");
2161
2162 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2163
2164 if (lq_sta == NULL)
2165 return NULL;
2166 lq_sta->lq.sta_id = 0xff;
2167
2168
2169 for (j = 0; j < LQ_SIZE; j++)
2170 for (i = 0; i < IWL_RATE_COUNT; i++)
2171 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2172
2173 return lq_sta;
2174 }
2175
2176 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2177 struct ieee80211_sta *sta, void *priv_sta)
2178 {
2179 int i, j;
2180 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2181 struct ieee80211_conf *conf = &priv->hw->conf;
2182 struct iwl_lq_sta *lq_sta = priv_sta;
2183
2184 lq_sta->flush_timer = 0;
2185 lq_sta->supp_rates = sta->supp_rates[sband->band];
2186 for (j = 0; j < LQ_SIZE; j++)
2187 for (i = 0; i < IWL_RATE_COUNT; i++)
2188 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2189
2190 IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2191 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2192 * the lowest or the highest rate.. Could consider using RSSI from
2193 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2194 * after assoc.. */
2195
2196 lq_sta->ibss_sta_added = 0;
2197 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2198 u8 sta_id = iwl_find_station(priv, sta->addr);
2199
2200 /* for IBSS the call are from tasklet */
2201 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2202
2203 if (sta_id == IWL_INVALID_STATION) {
2204 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2205 sta_id = iwl_add_station_flags(priv, sta->addr,
2206 0, CMD_ASYNC, NULL);
2207 }
2208 if ((sta_id != IWL_INVALID_STATION)) {
2209 lq_sta->lq.sta_id = sta_id;
2210 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2211 }
2212 /* FIXME: this is w/a remove it later */
2213 priv->assoc_station_added = 1;
2214 }
2215
2216 /* Find highest tx rate supported by hardware and destination station */
2217 lq_sta->last_txrate_idx = 3;
2218 for (i = 0; i < sband->n_bitrates; i++)
2219 if (sta->supp_rates[sband->band] & BIT(i))
2220 lq_sta->last_txrate_idx = i;
2221
2222 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2223 if (sband->band == IEEE80211_BAND_5GHZ)
2224 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2225
2226 lq_sta->is_dup = 0;
2227 lq_sta->is_green = rs_use_green(priv, conf);
2228 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2229 lq_sta->active_rate_basic = priv->active_rate_basic;
2230 lq_sta->band = priv->band;
2231 /*
2232 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2233 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2234 */
2235 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2236 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2237 lq_sta->active_siso_rate &= ~((u16)0x2);
2238 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2239
2240 /* Same here */
2241 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2242 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2243 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2244 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2245
2246 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2247 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2248 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2249 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2250
2251 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2252 lq_sta->active_siso_rate,
2253 lq_sta->active_mimo2_rate,
2254 lq_sta->active_mimo3_rate);
2255
2256 /* These values will be overriden later */
2257 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2258 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2259
2260 /* as default allow aggregation for all tids */
2261 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2262 lq_sta->drv = priv;
2263
2264 rs_initialize_lq(priv, conf, sta, lq_sta);
2265 }
2266
2267 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2268 struct iwl_lq_sta *lq_sta, u32 new_rate)
2269 {
2270 struct iwl_scale_tbl_info tbl_type;
2271 int index = 0;
2272 int rate_idx;
2273 int repeat_rate = 0;
2274 u8 ant_toggle_cnt = 0;
2275 u8 use_ht_possible = 1;
2276 u8 valid_tx_ant = 0;
2277 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2278
2279 /* Override starting rate (index 0) if needed for debug purposes */
2280 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2281
2282 /* Interpret new_rate (rate_n_flags) */
2283 memset(&tbl_type, 0, sizeof(tbl_type));
2284 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2285 &tbl_type, &rate_idx);
2286
2287 /* How many times should we repeat the initial rate? */
2288 if (is_legacy(tbl_type.lq_type)) {
2289 ant_toggle_cnt = 1;
2290 repeat_rate = IWL_NUMBER_TRY;
2291 } else {
2292 repeat_rate = IWL_HT_NUMBER_TRY;
2293 }
2294
2295 lq_cmd->general_params.mimo_delimiter =
2296 is_mimo(tbl_type.lq_type) ? 1 : 0;
2297
2298 /* Fill 1st table entry (index 0) */
2299 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2300
2301 if (num_of_ant(tbl_type.ant_type) == 1) {
2302 lq_cmd->general_params.single_stream_ant_msk =
2303 tbl_type.ant_type;
2304 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2305 lq_cmd->general_params.dual_stream_ant_msk =
2306 tbl_type.ant_type;
2307 } /* otherwise we don't modify the existing value */
2308
2309 index++;
2310 repeat_rate--;
2311
2312 if (priv)
2313 valid_tx_ant = priv->hw_params.valid_tx_ant;
2314
2315 /* Fill rest of rate table */
2316 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2317 /* Repeat initial/next rate.
2318 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2319 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2320 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2321 if (is_legacy(tbl_type.lq_type)) {
2322 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2323 ant_toggle_cnt++;
2324 else if (priv &&
2325 rs_toggle_antenna(valid_tx_ant,
2326 &new_rate, &tbl_type))
2327 ant_toggle_cnt = 1;
2328 }
2329
2330 /* Override next rate if needed for debug purposes */
2331 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2332
2333 /* Fill next table entry */
2334 lq_cmd->rs_table[index].rate_n_flags =
2335 cpu_to_le32(new_rate);
2336 repeat_rate--;
2337 index++;
2338 }
2339
2340 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2341 &rate_idx);
2342
2343 /* Indicate to uCode which entries might be MIMO.
2344 * If initial rate was MIMO, this will finally end up
2345 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2346 if (is_mimo(tbl_type.lq_type))
2347 lq_cmd->general_params.mimo_delimiter = index;
2348
2349 /* Get next rate */
2350 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2351 use_ht_possible);
2352
2353 /* How many times should we repeat the next rate? */
2354 if (is_legacy(tbl_type.lq_type)) {
2355 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2356 ant_toggle_cnt++;
2357 else if (priv &&
2358 rs_toggle_antenna(valid_tx_ant,
2359 &new_rate, &tbl_type))
2360 ant_toggle_cnt = 1;
2361
2362 repeat_rate = IWL_NUMBER_TRY;
2363 } else {
2364 repeat_rate = IWL_HT_NUMBER_TRY;
2365 }
2366
2367 /* Don't allow HT rates after next pass.
2368 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2369 use_ht_possible = 0;
2370
2371 /* Override next rate if needed for debug purposes */
2372 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2373
2374 /* Fill next table entry */
2375 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2376
2377 index++;
2378 repeat_rate--;
2379 }
2380
2381 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2382 lq_cmd->agg_params.agg_dis_start_th = 3;
2383 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2384 }
2385
2386 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2387 {
2388 return hw->priv;
2389 }
2390 /* rate scale requires free function to be implemented */
2391 static void rs_free(void *priv_rate)
2392 {
2393 return;
2394 }
2395
2396 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2397 void *priv_sta)
2398 {
2399 struct iwl_lq_sta *lq_sta = priv_sta;
2400 struct iwl_priv *priv __maybe_unused = priv_r;
2401
2402 IWL_DEBUG_RATE("enter\n");
2403 kfree(lq_sta);
2404 IWL_DEBUG_RATE("leave\n");
2405 }
2406
2407
2408 #ifdef CONFIG_MAC80211_DEBUGFS
2409 static int open_file_generic(struct inode *inode, struct file *file)
2410 {
2411 file->private_data = inode->i_private;
2412 return 0;
2413 }
2414 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2415 u32 *rate_n_flags, int index)
2416 {
2417 struct iwl_priv *priv;
2418
2419 priv = lq_sta->drv;
2420 if (lq_sta->dbg_fixed_rate) {
2421 if (index < 12) {
2422 *rate_n_flags = lq_sta->dbg_fixed_rate;
2423 } else {
2424 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2425 *rate_n_flags = 0x800D;
2426 else
2427 *rate_n_flags = 0x820A;
2428 }
2429 IWL_DEBUG_RATE("Fixed rate ON\n");
2430 } else {
2431 IWL_DEBUG_RATE("Fixed rate OFF\n");
2432 }
2433 }
2434
2435 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2436 const char __user *user_buf, size_t count, loff_t *ppos)
2437 {
2438 struct iwl_lq_sta *lq_sta = file->private_data;
2439 struct iwl_priv *priv;
2440 char buf[64];
2441 int buf_size;
2442 u32 parsed_rate;
2443
2444 priv = lq_sta->drv;
2445 memset(buf, 0, sizeof(buf));
2446 buf_size = min(count, sizeof(buf) - 1);
2447 if (copy_from_user(buf, user_buf, buf_size))
2448 return -EFAULT;
2449
2450 if (sscanf(buf, "%x", &parsed_rate) == 1)
2451 lq_sta->dbg_fixed_rate = parsed_rate;
2452 else
2453 lq_sta->dbg_fixed_rate = 0;
2454
2455 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2456 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2457 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2458 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2459
2460 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2461 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2462
2463 if (lq_sta->dbg_fixed_rate) {
2464 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2465 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2466 }
2467
2468 return count;
2469 }
2470
2471 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2472 char __user *user_buf, size_t count, loff_t *ppos)
2473 {
2474 char buff[1024];
2475 int desc = 0;
2476 int i = 0;
2477
2478 struct iwl_lq_sta *lq_sta = file->private_data;
2479
2480 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2481 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2482 lq_sta->total_failed, lq_sta->total_success,
2483 lq_sta->active_legacy_rate);
2484 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2485 lq_sta->dbg_fixed_rate);
2486 desc += sprintf(buff+desc, "general:"
2487 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2488 lq_sta->lq.general_params.flags,
2489 lq_sta->lq.general_params.mimo_delimiter,
2490 lq_sta->lq.general_params.single_stream_ant_msk,
2491 lq_sta->lq.general_params.dual_stream_ant_msk);
2492
2493 desc += sprintf(buff+desc, "agg:"
2494 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2495 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2496 lq_sta->lq.agg_params.agg_dis_start_th,
2497 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2498
2499 desc += sprintf(buff+desc,
2500 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2501 lq_sta->lq.general_params.start_rate_index[0],
2502 lq_sta->lq.general_params.start_rate_index[1],
2503 lq_sta->lq.general_params.start_rate_index[2],
2504 lq_sta->lq.general_params.start_rate_index[3]);
2505
2506
2507 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2508 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2509 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2510
2511 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2512 }
2513
2514 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2515 .write = rs_sta_dbgfs_scale_table_write,
2516 .read = rs_sta_dbgfs_scale_table_read,
2517 .open = open_file_generic,
2518 };
2519 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2520 char __user *user_buf, size_t count, loff_t *ppos)
2521 {
2522 char buff[1024];
2523 int desc = 0;
2524 int i, j;
2525
2526 struct iwl_lq_sta *lq_sta = file->private_data;
2527 for (i = 0; i < LQ_SIZE; i++) {
2528 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2529 "rate=0x%X\n",
2530 lq_sta->active_tbl == i?"*":"x",
2531 lq_sta->lq_info[i].lq_type,
2532 lq_sta->lq_info[i].is_SGI,
2533 lq_sta->lq_info[i].is_fat,
2534 lq_sta->lq_info[i].is_dup,
2535 lq_sta->lq_info[i].current_rate);
2536 for (j = 0; j < IWL_RATE_COUNT; j++) {
2537 desc += sprintf(buff+desc,
2538 "counter=%d success=%d %%=%d\n",
2539 lq_sta->lq_info[i].win[j].counter,
2540 lq_sta->lq_info[i].win[j].success_counter,
2541 lq_sta->lq_info[i].win[j].success_ratio);
2542 }
2543 }
2544 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2545 }
2546
2547 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2548 .read = rs_sta_dbgfs_stats_table_read,
2549 .open = open_file_generic,
2550 };
2551
2552 static void rs_add_debugfs(void *priv, void *priv_sta,
2553 struct dentry *dir)
2554 {
2555 struct iwl_lq_sta *lq_sta = priv_sta;
2556 lq_sta->rs_sta_dbgfs_scale_table_file =
2557 debugfs_create_file("rate_scale_table", 0600, dir,
2558 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2559 lq_sta->rs_sta_dbgfs_stats_table_file =
2560 debugfs_create_file("rate_stats_table", 0600, dir,
2561 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2562 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2563 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2564 &lq_sta->tx_agg_tid_en);
2565
2566 }
2567
2568 static void rs_remove_debugfs(void *priv, void *priv_sta)
2569 {
2570 struct iwl_lq_sta *lq_sta = priv_sta;
2571 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2572 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2573 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2574 }
2575 #endif
2576
2577 static struct rate_control_ops rs_ops = {
2578 .module = NULL,
2579 .name = RS_NAME,
2580 .tx_status = rs_tx_status,
2581 .get_rate = rs_get_rate,
2582 .rate_init = rs_rate_init,
2583 .alloc = rs_alloc,
2584 .free = rs_free,
2585 .alloc_sta = rs_alloc_sta,
2586 .free_sta = rs_free_sta,
2587 #ifdef CONFIG_MAC80211_DEBUGFS
2588 .add_sta_debugfs = rs_add_debugfs,
2589 .remove_sta_debugfs = rs_remove_debugfs,
2590 #endif
2591 };
2592
2593 int iwlagn_rate_control_register(void)
2594 {
2595 return ieee80211_rate_control_register(&rs_ops);
2596 }
2597
2598 void iwlagn_rate_control_unregister(void)
2599 {
2600 ieee80211_rate_control_unregister(&rs_ops);
2601 }
2602
Support for the Chinese Samsung S3C2440 based development boards