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[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * 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.retry_count;
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->tx_rate_idx < 0) ||
834 (tbl_type.is_SGI ^
835 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
836 (tbl_type.is_fat ^
837 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
838 (tbl_type.is_dup ^
839 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
840 (tbl_type.ant_type ^ info->antenna_sel_tx) ||
841 (!!(tx_rate & RATE_MCS_HT_MSK) ^
842 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
843 (!!(tx_rate & RATE_MCS_GF_MSK) ^
844 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
845 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
846 hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
847 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
848 goto out;
849 }
850
851 /* Update frame history window with "failure" for each Tx retry. */
852 while (retries) {
853 /* Look up the rate and other info used for each tx attempt.
854 * Each tx attempt steps one entry deeper in the rate table. */
855 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
856 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
857 &tbl_type, &rs_index);
858
859 /* If type matches "search" table,
860 * add failure to "search" history */
861 if ((tbl_type.lq_type == search_tbl->lq_type) &&
862 (tbl_type.ant_type == search_tbl->ant_type) &&
863 (tbl_type.is_SGI == search_tbl->is_SGI)) {
864 if (search_tbl->expected_tpt)
865 tpt = search_tbl->expected_tpt[rs_index];
866 else
867 tpt = 0;
868 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
869
870 /* Else if type matches "current/active" table,
871 * add failure to "current/active" history */
872 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
873 (tbl_type.ant_type == curr_tbl->ant_type) &&
874 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
875 if (curr_tbl->expected_tpt)
876 tpt = curr_tbl->expected_tpt[rs_index];
877 else
878 tpt = 0;
879 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
880 }
881
882 /* If not searching for a new mode, increment failed counter
883 * ... this helps determine when to start searching again */
884 if (lq_sta->stay_in_tbl)
885 lq_sta->total_failed++;
886 --retries;
887 index++;
888
889 }
890
891 /*
892 * Find (by rate) the history window to update with final Tx attempt;
893 * if Tx was successful first try, use original rate,
894 * else look up the rate that was, finally, successful.
895 */
896 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
897 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
898
899 /* Update frame history window with "success" if Tx got ACKed ... */
900 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
901
902 /* If type matches "search" table,
903 * add final tx status to "search" history */
904 if ((tbl_type.lq_type == search_tbl->lq_type) &&
905 (tbl_type.ant_type == search_tbl->ant_type) &&
906 (tbl_type.is_SGI == search_tbl->is_SGI)) {
907 if (search_tbl->expected_tpt)
908 tpt = search_tbl->expected_tpt[rs_index];
909 else
910 tpt = 0;
911 if (info->flags & IEEE80211_TX_CTL_AMPDU)
912 rs_collect_tx_data(search_win, rs_index, tpt,
913 info->status.ampdu_ack_len,
914 info->status.ampdu_ack_map);
915 else
916 rs_collect_tx_data(search_win, rs_index, tpt,
917 1, status);
918 /* Else if type matches "current/active" table,
919 * add final tx status to "current/active" history */
920 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
921 (tbl_type.ant_type == curr_tbl->ant_type) &&
922 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
923 if (curr_tbl->expected_tpt)
924 tpt = curr_tbl->expected_tpt[rs_index];
925 else
926 tpt = 0;
927 if (info->flags & IEEE80211_TX_CTL_AMPDU)
928 rs_collect_tx_data(window, rs_index, tpt,
929 info->status.ampdu_ack_len,
930 info->status.ampdu_ack_map);
931 else
932 rs_collect_tx_data(window, rs_index, tpt,
933 1, status);
934 }
935
936 /* If not searching for new mode, increment success/failed counter
937 * ... these help determine when to start searching again */
938 if (lq_sta->stay_in_tbl) {
939 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
940 lq_sta->total_success += info->status.ampdu_ack_map;
941 lq_sta->total_failed +=
942 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
943 } else {
944 if (status)
945 lq_sta->total_success++;
946 else
947 lq_sta->total_failed++;
948 }
949 }
950
951 /* See if there's a better rate or modulation mode to try. */
952 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
953 out:
954 return;
955 }
956
957 /*
958 * Begin a period of staying with a selected modulation mode.
959 * Set "stay_in_tbl" flag to prevent any mode switches.
960 * Set frame tx success limits according to legacy vs. high-throughput,
961 * and reset overall (spanning all rates) tx success history statistics.
962 * These control how long we stay using same modulation mode before
963 * searching for a new mode.
964 */
965 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
966 struct iwl_lq_sta *lq_sta)
967 {
968 IWL_DEBUG_RATE("we are staying in the same table\n");
969 lq_sta->stay_in_tbl = 1; /* only place this gets set */
970 if (is_legacy) {
971 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
972 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
973 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
974 } else {
975 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
976 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
977 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
978 }
979 lq_sta->table_count = 0;
980 lq_sta->total_failed = 0;
981 lq_sta->total_success = 0;
982 }
983
984 /*
985 * Find correct throughput table for given mode of modulation
986 */
987 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
988 struct iwl_scale_tbl_info *tbl)
989 {
990 if (is_legacy(tbl->lq_type)) {
991 if (!is_a_band(tbl->lq_type))
992 tbl->expected_tpt = expected_tpt_G;
993 else
994 tbl->expected_tpt = expected_tpt_A;
995 } else if (is_siso(tbl->lq_type)) {
996 if (tbl->is_fat && !lq_sta->is_dup)
997 if (tbl->is_SGI)
998 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
999 else
1000 tbl->expected_tpt = expected_tpt_siso40MHz;
1001 else if (tbl->is_SGI)
1002 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1003 else
1004 tbl->expected_tpt = expected_tpt_siso20MHz;
1005
1006 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1007 if (tbl->is_fat && !lq_sta->is_dup)
1008 if (tbl->is_SGI)
1009 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1010 else
1011 tbl->expected_tpt = expected_tpt_mimo40MHz;
1012 else if (tbl->is_SGI)
1013 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1014 else
1015 tbl->expected_tpt = expected_tpt_mimo20MHz;
1016 } else
1017 tbl->expected_tpt = expected_tpt_G;
1018 }
1019
1020 /*
1021 * Find starting rate for new "search" high-throughput mode of modulation.
1022 * Goal is to find lowest expected rate (under perfect conditions) that is
1023 * above the current measured throughput of "active" mode, to give new mode
1024 * a fair chance to prove itself without too many challenges.
1025 *
1026 * This gets called when transitioning to more aggressive modulation
1027 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1028 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1029 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1030 * bit rate will typically need to increase, but not if performance was bad.
1031 */
1032 static s32 rs_get_best_rate(struct iwl_priv *priv,
1033 struct iwl_lq_sta *lq_sta,
1034 struct iwl_scale_tbl_info *tbl, /* "search" */
1035 u16 rate_mask, s8 index)
1036 {
1037 /* "active" values */
1038 struct iwl_scale_tbl_info *active_tbl =
1039 &(lq_sta->lq_info[lq_sta->active_tbl]);
1040 s32 active_sr = active_tbl->win[index].success_ratio;
1041 s32 active_tpt = active_tbl->expected_tpt[index];
1042
1043 /* expected "search" throughput */
1044 s32 *tpt_tbl = tbl->expected_tpt;
1045
1046 s32 new_rate, high, low, start_hi;
1047 u16 high_low;
1048 s8 rate = index;
1049
1050 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1051
1052 for (; ;) {
1053 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1054 tbl->lq_type);
1055
1056 low = high_low & 0xff;
1057 high = (high_low >> 8) & 0xff;
1058
1059 /*
1060 * Lower the "search" bit rate, to give new "search" mode
1061 * approximately the same throughput as "active" if:
1062 *
1063 * 1) "Active" mode has been working modestly well (but not
1064 * great), and expected "search" throughput (under perfect
1065 * conditions) at candidate rate is above the actual
1066 * measured "active" throughput (but less than expected
1067 * "active" throughput under perfect conditions).
1068 * OR
1069 * 2) "Active" mode has been working perfectly or very well
1070 * and expected "search" throughput (under perfect
1071 * conditions) at candidate rate is above expected
1072 * "active" throughput (under perfect conditions).
1073 */
1074 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1075 ((active_sr > IWL_RATE_DECREASE_TH) &&
1076 (active_sr <= IWL_RATE_HIGH_TH) &&
1077 (tpt_tbl[rate] <= active_tpt))) ||
1078 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1079 (tpt_tbl[rate] > active_tpt))) {
1080
1081 /* (2nd or later pass)
1082 * If we've already tried to raise the rate, and are
1083 * now trying to lower it, use the higher rate. */
1084 if (start_hi != IWL_RATE_INVALID) {
1085 new_rate = start_hi;
1086 break;
1087 }
1088
1089 new_rate = rate;
1090
1091 /* Loop again with lower rate */
1092 if (low != IWL_RATE_INVALID)
1093 rate = low;
1094
1095 /* Lower rate not available, use the original */
1096 else
1097 break;
1098
1099 /* Else try to raise the "search" rate to match "active" */
1100 } else {
1101 /* (2nd or later pass)
1102 * If we've already tried to lower the rate, and are
1103 * now trying to raise it, use the lower rate. */
1104 if (new_rate != IWL_RATE_INVALID)
1105 break;
1106
1107 /* Loop again with higher rate */
1108 else if (high != IWL_RATE_INVALID) {
1109 start_hi = high;
1110 rate = high;
1111
1112 /* Higher rate not available, use the original */
1113 } else {
1114 new_rate = rate;
1115 break;
1116 }
1117 }
1118 }
1119
1120 return new_rate;
1121 }
1122
1123 /*
1124 * Set up search table for MIMO
1125 */
1126 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1127 struct iwl_lq_sta *lq_sta,
1128 struct ieee80211_conf *conf,
1129 struct ieee80211_sta *sta,
1130 struct iwl_scale_tbl_info *tbl, int index)
1131 {
1132 u16 rate_mask;
1133 s32 rate;
1134 s8 is_green = lq_sta->is_green;
1135
1136 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1137 !sta->ht_info.ht_supported)
1138 return -1;
1139
1140 if (((sta->ht_info.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1141 == WLAN_HT_CAP_SM_PS_STATIC)
1142 return -1;
1143
1144 /* Need both Tx chains/antennas to support MIMO */
1145 if (priv->hw_params.tx_chains_num < 2)
1146 return -1;
1147
1148 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1149
1150 tbl->lq_type = LQ_MIMO2;
1151 tbl->is_dup = lq_sta->is_dup;
1152 tbl->action = 0;
1153 rate_mask = lq_sta->active_mimo2_rate;
1154
1155 if (priv->current_ht_config.supported_chan_width
1156 == IWL_CHANNEL_WIDTH_40MHZ)
1157 tbl->is_fat = 1;
1158 else
1159 tbl->is_fat = 0;
1160
1161 /* FIXME: - don't toggle SGI here
1162 if (tbl->is_fat) {
1163 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1164 tbl->is_SGI = 1;
1165 else
1166 tbl->is_SGI = 0;
1167 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1168 tbl->is_SGI = 1;
1169 else
1170 tbl->is_SGI = 0;
1171 */
1172
1173 rs_set_expected_tpt_table(lq_sta, tbl);
1174
1175 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1176
1177 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1178
1179 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1180 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1181 rate, rate_mask);
1182 return -1;
1183 }
1184 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1185
1186 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1187 tbl->current_rate, is_green);
1188 return 0;
1189 }
1190
1191 /*
1192 * Set up search table for SISO
1193 */
1194 static int rs_switch_to_siso(struct iwl_priv *priv,
1195 struct iwl_lq_sta *lq_sta,
1196 struct ieee80211_conf *conf,
1197 struct ieee80211_sta *sta,
1198 struct iwl_scale_tbl_info *tbl, int index)
1199 {
1200 u16 rate_mask;
1201 u8 is_green = lq_sta->is_green;
1202 s32 rate;
1203
1204 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1205 !sta->ht_info.ht_supported)
1206 return -1;
1207
1208 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1209
1210 tbl->is_dup = lq_sta->is_dup;
1211 tbl->lq_type = LQ_SISO;
1212 tbl->action = 0;
1213 rate_mask = lq_sta->active_siso_rate;
1214
1215 if (priv->current_ht_config.supported_chan_width
1216 == IWL_CHANNEL_WIDTH_40MHZ)
1217 tbl->is_fat = 1;
1218 else
1219 tbl->is_fat = 0;
1220
1221 /* FIXME: - don't toggle SGI here
1222 if (tbl->is_fat) {
1223 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1224 tbl->is_SGI = 1;
1225 else
1226 tbl->is_SGI = 0;
1227 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1228 tbl->is_SGI = 1;
1229 else
1230 tbl->is_SGI = 0;
1231 */
1232
1233 if (is_green)
1234 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1235
1236 rs_set_expected_tpt_table(lq_sta, tbl);
1237 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1238
1239 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1240 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1241 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1242 rate, rate_mask);
1243 return -1;
1244 }
1245 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1246 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1247 tbl->current_rate, is_green);
1248 return 0;
1249 }
1250
1251 /*
1252 * Try to switch to new modulation mode from legacy
1253 */
1254 static int rs_move_legacy_other(struct iwl_priv *priv,
1255 struct iwl_lq_sta *lq_sta,
1256 struct ieee80211_conf *conf,
1257 struct ieee80211_sta *sta,
1258 int index)
1259 {
1260 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1261 struct iwl_scale_tbl_info *search_tbl =
1262 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1263 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1264 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1265 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1266 u8 start_action = tbl->action;
1267 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1268 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1269 int ret = 0;
1270
1271 for (; ;) {
1272 switch (tbl->action) {
1273 case IWL_LEGACY_SWITCH_ANTENNA1:
1274 case IWL_LEGACY_SWITCH_ANTENNA2:
1275 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1276
1277 lq_sta->action_counter++;
1278
1279 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1280 tx_chains_num <= 1) ||
1281 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1282 tx_chains_num <= 2))
1283 break;
1284
1285 /* Don't change antenna if success has been great */
1286 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1287 break;
1288
1289 /* Set up search table to try other antenna */
1290 memcpy(search_tbl, tbl, sz);
1291
1292 if (rs_toggle_antenna(valid_tx_ant,
1293 &search_tbl->current_rate, search_tbl)) {
1294 rs_set_expected_tpt_table(lq_sta, search_tbl);
1295 goto out;
1296 }
1297 break;
1298 case IWL_LEGACY_SWITCH_SISO:
1299 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1300
1301 /* Set up search table to try SISO */
1302 memcpy(search_tbl, tbl, sz);
1303 search_tbl->is_SGI = 0;
1304 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1305 search_tbl, index);
1306 if (!ret) {
1307 lq_sta->action_counter = 0;
1308 goto out;
1309 }
1310
1311 break;
1312 case IWL_LEGACY_SWITCH_MIMO2_AB:
1313 case IWL_LEGACY_SWITCH_MIMO2_AC:
1314 case IWL_LEGACY_SWITCH_MIMO2_BC:
1315 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1316
1317 /* Set up search table to try MIMO */
1318 memcpy(search_tbl, tbl, sz);
1319 search_tbl->is_SGI = 0;
1320
1321 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1322 search_tbl->ant_type = ANT_AB;
1323 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1324 search_tbl->ant_type = ANT_AC;
1325 else
1326 search_tbl->ant_type = ANT_BC;
1327
1328 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1329 break;
1330
1331 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1332 search_tbl, index);
1333 if (!ret) {
1334 lq_sta->action_counter = 0;
1335 goto out;
1336 }
1337 break;
1338 }
1339 tbl->action++;
1340 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1341 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1342
1343 if (tbl->action == start_action)
1344 break;
1345
1346 }
1347 search_tbl->lq_type = LQ_NONE;
1348 return 0;
1349
1350 out:
1351 lq_sta->search_better_tbl = 1;
1352 tbl->action++;
1353 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1354 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1355 return 0;
1356
1357 }
1358
1359 /*
1360 * Try to switch to new modulation mode from SISO
1361 */
1362 static int rs_move_siso_to_other(struct iwl_priv *priv,
1363 struct iwl_lq_sta *lq_sta,
1364 struct ieee80211_conf *conf,
1365 struct ieee80211_sta *sta, int index)
1366 {
1367 u8 is_green = lq_sta->is_green;
1368 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1369 struct iwl_scale_tbl_info *search_tbl =
1370 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1371 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1372 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1373 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1374 u8 start_action = tbl->action;
1375 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1376 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1377 int ret;
1378
1379 for (;;) {
1380 lq_sta->action_counter++;
1381 switch (tbl->action) {
1382 case IWL_SISO_SWITCH_ANTENNA1:
1383 case IWL_SISO_SWITCH_ANTENNA2:
1384 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1385
1386 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1387 tx_chains_num <= 1) ||
1388 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1389 tx_chains_num <= 2))
1390 break;
1391
1392 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1393 break;
1394
1395 memcpy(search_tbl, tbl, sz);
1396 if (rs_toggle_antenna(valid_tx_ant,
1397 &search_tbl->current_rate, search_tbl))
1398 goto out;
1399 break;
1400 case IWL_SISO_SWITCH_MIMO2_AB:
1401 case IWL_SISO_SWITCH_MIMO2_AC:
1402 case IWL_SISO_SWITCH_MIMO2_BC:
1403 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1404 memcpy(search_tbl, tbl, sz);
1405 search_tbl->is_SGI = 0;
1406
1407 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1408 search_tbl->ant_type = ANT_AB;
1409 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1410 search_tbl->ant_type = ANT_AC;
1411 else
1412 search_tbl->ant_type = ANT_BC;
1413
1414 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1415 break;
1416
1417 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1418 search_tbl, index);
1419 if (!ret)
1420 goto out;
1421 break;
1422 case IWL_SISO_SWITCH_GI:
1423 if (!tbl->is_fat &&
1424 !(priv->current_ht_config.sgf &
1425 HT_SHORT_GI_20MHZ))
1426 break;
1427 if (tbl->is_fat &&
1428 !(priv->current_ht_config.sgf &
1429 HT_SHORT_GI_40MHZ))
1430 break;
1431
1432 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1433
1434 memcpy(search_tbl, tbl, sz);
1435 if (is_green) {
1436 if (!tbl->is_SGI)
1437 break;
1438 else
1439 IWL_ERROR("SGI was set in GF+SISO\n");
1440 }
1441 search_tbl->is_SGI = !tbl->is_SGI;
1442 rs_set_expected_tpt_table(lq_sta, search_tbl);
1443 if (tbl->is_SGI) {
1444 s32 tpt = lq_sta->last_tpt / 100;
1445 if (tpt >= search_tbl->expected_tpt[index])
1446 break;
1447 }
1448 search_tbl->current_rate = rate_n_flags_from_tbl(
1449 search_tbl, index, is_green);
1450 goto out;
1451 }
1452 tbl->action++;
1453 if (tbl->action > IWL_SISO_SWITCH_GI)
1454 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1455
1456 if (tbl->action == start_action)
1457 break;
1458 }
1459 search_tbl->lq_type = LQ_NONE;
1460 return 0;
1461
1462 out:
1463 lq_sta->search_better_tbl = 1;
1464 tbl->action++;
1465 if (tbl->action > IWL_SISO_SWITCH_GI)
1466 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1467 return 0;
1468 }
1469
1470 /*
1471 * Try to switch to new modulation mode from MIMO
1472 */
1473 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1474 struct iwl_lq_sta *lq_sta,
1475 struct ieee80211_conf *conf,
1476 struct ieee80211_sta *sta, int index)
1477 {
1478 s8 is_green = lq_sta->is_green;
1479 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1480 struct iwl_scale_tbl_info *search_tbl =
1481 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1482 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1483 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1484 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1485 u8 start_action = tbl->action;
1486 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1487 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1488 int ret;
1489
1490 for (;;) {
1491 lq_sta->action_counter++;
1492 switch (tbl->action) {
1493 case IWL_MIMO2_SWITCH_ANTENNA1:
1494 case IWL_MIMO2_SWITCH_ANTENNA2:
1495 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1496
1497 if (tx_chains_num <= 2)
1498 break;
1499
1500 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1501 break;
1502
1503 memcpy(search_tbl, tbl, sz);
1504 if (rs_toggle_antenna(valid_tx_ant,
1505 &search_tbl->current_rate, search_tbl))
1506 goto out;
1507 break;
1508 case IWL_MIMO2_SWITCH_SISO_A:
1509 case IWL_MIMO2_SWITCH_SISO_B:
1510 case IWL_MIMO2_SWITCH_SISO_C:
1511 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1512
1513 /* Set up new search table for SISO */
1514 memcpy(search_tbl, tbl, sz);
1515
1516 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1517 search_tbl->ant_type = ANT_A;
1518 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1519 search_tbl->ant_type = ANT_B;
1520 else
1521 search_tbl->ant_type = ANT_C;
1522
1523 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1524 break;
1525
1526 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1527 search_tbl, index);
1528 if (!ret)
1529 goto out;
1530
1531 break;
1532
1533 case IWL_MIMO2_SWITCH_GI:
1534 if (!tbl->is_fat &&
1535 !(priv->current_ht_config.sgf &
1536 HT_SHORT_GI_20MHZ))
1537 break;
1538 if (tbl->is_fat &&
1539 !(priv->current_ht_config.sgf &
1540 HT_SHORT_GI_40MHZ))
1541 break;
1542
1543 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1544
1545 /* Set up new search table for MIMO */
1546 memcpy(search_tbl, tbl, sz);
1547 search_tbl->is_SGI = !tbl->is_SGI;
1548 rs_set_expected_tpt_table(lq_sta, search_tbl);
1549 /*
1550 * If active table already uses the fastest possible
1551 * modulation (dual stream with short guard interval),
1552 * and it's working well, there's no need to look
1553 * for a better type of modulation!
1554 */
1555 if (tbl->is_SGI) {
1556 s32 tpt = lq_sta->last_tpt / 100;
1557 if (tpt >= search_tbl->expected_tpt[index])
1558 break;
1559 }
1560 search_tbl->current_rate = rate_n_flags_from_tbl(
1561 search_tbl, index, is_green);
1562 goto out;
1563
1564 }
1565 tbl->action++;
1566 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1567 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1568
1569 if (tbl->action == start_action)
1570 break;
1571 }
1572 search_tbl->lq_type = LQ_NONE;
1573 return 0;
1574 out:
1575 lq_sta->search_better_tbl = 1;
1576 tbl->action++;
1577 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1578 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1579 return 0;
1580
1581 }
1582
1583 /*
1584 * Check whether we should continue using same modulation mode, or
1585 * begin search for a new mode, based on:
1586 * 1) # tx successes or failures while using this mode
1587 * 2) # times calling this function
1588 * 3) elapsed time in this mode (not used, for now)
1589 */
1590 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1591 {
1592 struct iwl_scale_tbl_info *tbl;
1593 int i;
1594 int active_tbl;
1595 int flush_interval_passed = 0;
1596 struct iwl_priv *priv;
1597
1598 priv = lq_sta->drv;
1599 active_tbl = lq_sta->active_tbl;
1600
1601 tbl = &(lq_sta->lq_info[active_tbl]);
1602
1603 /* If we've been disallowing search, see if we should now allow it */
1604 if (lq_sta->stay_in_tbl) {
1605
1606 /* Elapsed time using current modulation mode */
1607 if (lq_sta->flush_timer)
1608 flush_interval_passed =
1609 time_after(jiffies,
1610 (unsigned long)(lq_sta->flush_timer +
1611 IWL_RATE_SCALE_FLUSH_INTVL));
1612
1613 /*
1614 * Check if we should allow search for new modulation mode.
1615 * If many frames have failed or succeeded, or we've used
1616 * this same modulation for a long time, allow search, and
1617 * reset history stats that keep track of whether we should
1618 * allow a new search. Also (below) reset all bitmaps and
1619 * stats in active history.
1620 */
1621 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1622 (lq_sta->total_success > lq_sta->max_success_limit) ||
1623 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1624 && (flush_interval_passed))) {
1625 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1626 lq_sta->total_failed,
1627 lq_sta->total_success,
1628 flush_interval_passed);
1629
1630 /* Allow search for new mode */
1631 lq_sta->stay_in_tbl = 0; /* only place reset */
1632 lq_sta->total_failed = 0;
1633 lq_sta->total_success = 0;
1634 lq_sta->flush_timer = 0;
1635
1636 /*
1637 * Else if we've used this modulation mode enough repetitions
1638 * (regardless of elapsed time or success/failure), reset
1639 * history bitmaps and rate-specific stats for all rates in
1640 * active table.
1641 */
1642 } else {
1643 lq_sta->table_count++;
1644 if (lq_sta->table_count >=
1645 lq_sta->table_count_limit) {
1646 lq_sta->table_count = 0;
1647
1648 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1649 for (i = 0; i < IWL_RATE_COUNT; i++)
1650 rs_rate_scale_clear_window(
1651 &(tbl->win[i]));
1652 }
1653 }
1654
1655 /* If transitioning to allow "search", reset all history
1656 * bitmaps and stats in active table (this will become the new
1657 * "search" table). */
1658 if (!lq_sta->stay_in_tbl) {
1659 for (i = 0; i < IWL_RATE_COUNT; i++)
1660 rs_rate_scale_clear_window(&(tbl->win[i]));
1661 }
1662 }
1663 }
1664
1665 /*
1666 * Do rate scaling and search for new modulation mode.
1667 */
1668 static void rs_rate_scale_perform(struct iwl_priv *priv,
1669 struct ieee80211_hdr *hdr,
1670 struct ieee80211_sta *sta,
1671 struct iwl_lq_sta *lq_sta)
1672 {
1673 struct ieee80211_hw *hw = priv->hw;
1674 struct ieee80211_conf *conf = &hw->conf;
1675 int low = IWL_RATE_INVALID;
1676 int high = IWL_RATE_INVALID;
1677 int index;
1678 int i;
1679 struct iwl_rate_scale_data *window = NULL;
1680 int current_tpt = IWL_INVALID_VALUE;
1681 int low_tpt = IWL_INVALID_VALUE;
1682 int high_tpt = IWL_INVALID_VALUE;
1683 u32 fail_count;
1684 s8 scale_action = 0;
1685 __le16 fc;
1686 u16 rate_mask;
1687 u8 update_lq = 0;
1688 struct iwl_scale_tbl_info *tbl, *tbl1;
1689 u16 rate_scale_index_msk = 0;
1690 u32 rate;
1691 u8 is_green = 0;
1692 u8 active_tbl = 0;
1693 u8 done_search = 0;
1694 u16 high_low;
1695 s32 sr;
1696 u8 tid = MAX_TID_COUNT;
1697
1698 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1699
1700 fc = hdr->frame_control;
1701 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1702 /* Send management frames and broadcast/multicast data using
1703 * lowest rate. */
1704 /* TODO: this could probably be improved.. */
1705 return;
1706 }
1707
1708 if (!sta || !lq_sta)
1709 return;
1710
1711 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1712
1713 tid = rs_tl_add_packet(lq_sta, hdr);
1714
1715 /*
1716 * Select rate-scale / modulation-mode table to work with in
1717 * the rest of this function: "search" if searching for better
1718 * modulation mode, or "active" if doing rate scaling within a mode.
1719 */
1720 if (!lq_sta->search_better_tbl)
1721 active_tbl = lq_sta->active_tbl;
1722 else
1723 active_tbl = 1 - lq_sta->active_tbl;
1724
1725 tbl = &(lq_sta->lq_info[active_tbl]);
1726 is_green = lq_sta->is_green;
1727
1728 /* current tx rate */
1729 index = lq_sta->last_txrate_idx;
1730
1731 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1732 tbl->lq_type);
1733
1734 /* rates available for this association, and for modulation mode */
1735 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1736
1737 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1738
1739 /* mask with station rate restriction */
1740 if (is_legacy(tbl->lq_type)) {
1741 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1742 /* supp_rates has no CCK bits in A mode */
1743 rate_scale_index_msk = (u16) (rate_mask &
1744 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1745 else
1746 rate_scale_index_msk = (u16) (rate_mask &
1747 lq_sta->supp_rates);
1748
1749 } else
1750 rate_scale_index_msk = rate_mask;
1751
1752 if (!rate_scale_index_msk)
1753 rate_scale_index_msk = rate_mask;
1754
1755 if (!((1 << index) & rate_scale_index_msk)) {
1756 IWL_ERROR("Current Rate is not valid\n");
1757 return;
1758 }
1759
1760 /* Get expected throughput table and history window for current rate */
1761 if (!tbl->expected_tpt) {
1762 IWL_ERROR("tbl->expected_tpt is NULL\n");
1763 return;
1764 }
1765
1766 window = &(tbl->win[index]);
1767
1768 /*
1769 * If there is not enough history to calculate actual average
1770 * throughput, keep analyzing results of more tx frames, without
1771 * changing rate or mode (bypass most of the rest of this function).
1772 * Set up new rate table in uCode only if old rate is not supported
1773 * in current association (use new rate found above).
1774 */
1775 fail_count = window->counter - window->success_counter;
1776 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1777 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1778 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1779 "for index %d\n",
1780 window->success_counter, window->counter, index);
1781
1782 /* Can't calculate this yet; not enough history */
1783 window->average_tpt = IWL_INVALID_VALUE;
1784
1785 /* Should we stay with this modulation mode,
1786 * or search for a new one? */
1787 rs_stay_in_table(lq_sta);
1788
1789 goto out;
1790 }
1791
1792 /* Else we have enough samples; calculate estimate of
1793 * actual average throughput */
1794
1795 BUG_ON(window->average_tpt != ((window->success_ratio *
1796 tbl->expected_tpt[index] + 64) / 128));
1797
1798 /* If we are searching for better modulation mode, check success. */
1799 if (lq_sta->search_better_tbl) {
1800
1801 /* If good success, continue using the "search" mode;
1802 * no need to send new link quality command, since we're
1803 * continuing to use the setup that we've been trying. */
1804 if (window->average_tpt > lq_sta->last_tpt) {
1805
1806 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1807 "suc=%d cur-tpt=%d old-tpt=%d\n",
1808 window->success_ratio,
1809 window->average_tpt,
1810 lq_sta->last_tpt);
1811
1812 if (!is_legacy(tbl->lq_type))
1813 lq_sta->enable_counter = 1;
1814
1815 /* Swap tables; "search" becomes "active" */
1816 lq_sta->active_tbl = active_tbl;
1817 current_tpt = window->average_tpt;
1818
1819 /* Else poor success; go back to mode in "active" table */
1820 } else {
1821
1822 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1823 "suc=%d cur-tpt=%d old-tpt=%d\n",
1824 window->success_ratio,
1825 window->average_tpt,
1826 lq_sta->last_tpt);
1827
1828 /* Nullify "search" table */
1829 tbl->lq_type = LQ_NONE;
1830
1831 /* Revert to "active" table */
1832 active_tbl = lq_sta->active_tbl;
1833 tbl = &(lq_sta->lq_info[active_tbl]);
1834
1835 /* Revert to "active" rate and throughput info */
1836 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1837 current_tpt = lq_sta->last_tpt;
1838
1839 /* Need to set up a new rate table in uCode */
1840 update_lq = 1;
1841 }
1842
1843 /* Either way, we've made a decision; modulation mode
1844 * search is done, allow rate adjustment next time. */
1845 lq_sta->search_better_tbl = 0;
1846 done_search = 1; /* Don't switch modes below! */
1847 goto lq_update;
1848 }
1849
1850 /* (Else) not in search of better modulation mode, try for better
1851 * starting rate, while staying in this mode. */
1852 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1853 tbl->lq_type);
1854 low = high_low & 0xff;
1855 high = (high_low >> 8) & 0xff;
1856
1857 sr = window->success_ratio;
1858
1859 /* Collect measured throughputs for current and adjacent rates */
1860 current_tpt = window->average_tpt;
1861 if (low != IWL_RATE_INVALID)
1862 low_tpt = tbl->win[low].average_tpt;
1863 if (high != IWL_RATE_INVALID)
1864 high_tpt = tbl->win[high].average_tpt;
1865
1866 scale_action = 0;
1867
1868 /* Too many failures, decrease rate */
1869 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1870 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1871 scale_action = -1;
1872
1873 /* No throughput measured yet for adjacent rates; try increase. */
1874 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1875 (high_tpt == IWL_INVALID_VALUE)) {
1876
1877 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1878 scale_action = 1;
1879 else if (low != IWL_RATE_INVALID)
1880 scale_action = -1;
1881 }
1882
1883 /* Both adjacent throughputs are measured, but neither one has better
1884 * throughput; we're using the best rate, don't change it! */
1885 else if ((low_tpt != IWL_INVALID_VALUE) &&
1886 (high_tpt != IWL_INVALID_VALUE) &&
1887 (low_tpt < current_tpt) &&
1888 (high_tpt < current_tpt))
1889 scale_action = 0;
1890
1891 /* At least one adjacent rate's throughput is measured,
1892 * and may have better performance. */
1893 else {
1894 /* Higher adjacent rate's throughput is measured */
1895 if (high_tpt != IWL_INVALID_VALUE) {
1896 /* Higher rate has better throughput */
1897 if (high_tpt > current_tpt &&
1898 sr >= IWL_RATE_INCREASE_TH) {
1899 scale_action = 1;
1900 } else {
1901 IWL_DEBUG_RATE
1902 ("decrease rate because of high tpt\n");
1903 scale_action = -1;
1904 }
1905
1906 /* Lower adjacent rate's throughput is measured */
1907 } else if (low_tpt != IWL_INVALID_VALUE) {
1908 /* Lower rate has better throughput */
1909 if (low_tpt > current_tpt) {
1910 IWL_DEBUG_RATE
1911 ("decrease rate because of low tpt\n");
1912 scale_action = -1;
1913 } else if (sr >= IWL_RATE_INCREASE_TH) {
1914 scale_action = 1;
1915 }
1916 }
1917 }
1918
1919 /* Sanity check; asked for decrease, but success rate or throughput
1920 * has been good at old rate. Don't change it. */
1921 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1922 ((sr > IWL_RATE_HIGH_TH) ||
1923 (current_tpt > (100 * tbl->expected_tpt[low]))))
1924 scale_action = 0;
1925
1926 switch (scale_action) {
1927 case -1:
1928 /* Decrease starting rate, update uCode's rate table */
1929 if (low != IWL_RATE_INVALID) {
1930 update_lq = 1;
1931 index = low;
1932 }
1933 break;
1934 case 1:
1935 /* Increase starting rate, update uCode's rate table */
1936 if (high != IWL_RATE_INVALID) {
1937 update_lq = 1;
1938 index = high;
1939 }
1940
1941 break;
1942 case 0:
1943 /* No change */
1944 default:
1945 break;
1946 }
1947
1948 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1949 "high %d type %d\n",
1950 index, scale_action, low, high, tbl->lq_type);
1951
1952 lq_update:
1953 /* Replace uCode's rate table for the destination station. */
1954 if (update_lq) {
1955 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1956 rs_fill_link_cmd(priv, lq_sta, rate);
1957 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1958 }
1959
1960 /* Should we stay with this modulation mode, or search for a new one? */
1961 rs_stay_in_table(lq_sta);
1962
1963 /*
1964 * Search for new modulation mode if we're:
1965 * 1) Not changing rates right now
1966 * 2) Not just finishing up a search
1967 * 3) Allowing a new search
1968 */
1969 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1970 /* Save current throughput to compare with "search" throughput*/
1971 lq_sta->last_tpt = current_tpt;
1972
1973 /* Select a new "search" modulation mode to try.
1974 * If one is found, set up the new "search" table. */
1975 if (is_legacy(tbl->lq_type))
1976 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1977 else if (is_siso(tbl->lq_type))
1978 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1979 else
1980 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1981
1982 /* If new "search" mode was selected, set up in uCode table */
1983 if (lq_sta->search_better_tbl) {
1984 /* Access the "search" table, clear its history. */
1985 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1986 for (i = 0; i < IWL_RATE_COUNT; i++)
1987 rs_rate_scale_clear_window(&(tbl->win[i]));
1988
1989 /* Use new "search" start rate */
1990 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1991
1992 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1993 tbl->current_rate, index);
1994 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1995 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1996 }
1997
1998 /* If the "active" (non-search) mode was legacy,
1999 * and we've tried switching antennas,
2000 * but we haven't been able to try HT modes (not available),
2001 * stay with best antenna legacy modulation for a while
2002 * before next round of mode comparisons. */
2003 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2004 if (is_legacy(tbl1->lq_type) &&
2005 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2006 (lq_sta->action_counter >= 1)) {
2007 lq_sta->action_counter = 0;
2008 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2009 rs_set_stay_in_table(priv, 1, lq_sta);
2010 }
2011
2012 /* If we're in an HT mode, and all 3 mode switch actions
2013 * have been tried and compared, stay in this best modulation
2014 * mode for a while before next round of mode comparisons. */
2015 if (lq_sta->enable_counter &&
2016 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2017 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2018 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2019 (tid != MAX_TID_COUNT)) {
2020 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2021 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2022 }
2023 lq_sta->action_counter = 0;
2024 rs_set_stay_in_table(priv, 0, lq_sta);
2025 }
2026
2027 /*
2028 * Else, don't search for a new modulation mode.
2029 * Put new timestamp in stay-in-modulation-mode flush timer if:
2030 * 1) Not changing rates right now
2031 * 2) Not just finishing up a search
2032 * 3) flush timer is empty
2033 */
2034 } else {
2035 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2036 lq_sta->flush_timer = jiffies;
2037 }
2038
2039 out:
2040 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2041 i = index;
2042 lq_sta->last_txrate_idx = i;
2043
2044 return;
2045 }
2046
2047
2048 static void rs_initialize_lq(struct iwl_priv *priv,
2049 struct ieee80211_conf *conf,
2050 struct ieee80211_sta *sta,
2051 struct iwl_lq_sta *lq_sta)
2052 {
2053 struct iwl_scale_tbl_info *tbl;
2054 int rate_idx;
2055 int i;
2056 u32 rate;
2057 u8 use_green = rs_use_green(priv, conf);
2058 u8 active_tbl = 0;
2059 u8 valid_tx_ant;
2060
2061 if (!sta || !lq_sta)
2062 goto out;
2063
2064 i = lq_sta->last_txrate_idx;
2065
2066 if ((lq_sta->lq.sta_id == 0xff) &&
2067 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2068 goto out;
2069
2070 valid_tx_ant = priv->hw_params.valid_tx_ant;
2071
2072 if (!lq_sta->search_better_tbl)
2073 active_tbl = lq_sta->active_tbl;
2074 else
2075 active_tbl = 1 - lq_sta->active_tbl;
2076
2077 tbl = &(lq_sta->lq_info[active_tbl]);
2078
2079 if ((i < 0) || (i >= IWL_RATE_COUNT))
2080 i = 0;
2081
2082 /* FIXME:RS: This is also wrong in 4965 */
2083 rate = iwl_rates[i].plcp;
2084 rate |= RATE_MCS_ANT_B_MSK;
2085 rate &= ~RATE_MCS_ANT_A_MSK;
2086
2087 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2088 rate |= RATE_MCS_CCK_MSK;
2089
2090 tbl->ant_type = ANT_B;
2091 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2092 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2093 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2094
2095 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2096 tbl->current_rate = rate;
2097 rs_set_expected_tpt_table(lq_sta, tbl);
2098 rs_fill_link_cmd(NULL, lq_sta, rate);
2099 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2100 out:
2101 return;
2102 }
2103
2104 static void rs_get_rate(void *priv_r, struct ieee80211_supported_band *sband,
2105 struct ieee80211_sta *sta, void *priv_sta,
2106 struct sk_buff *skb, struct rate_selection *sel)
2107 {
2108
2109 int i;
2110 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2111 struct ieee80211_conf *conf = &priv->hw->conf;
2112 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2113 __le16 fc;
2114 struct iwl_lq_sta *lq_sta;
2115
2116 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2117
2118 /* Send management frames and broadcast/multicast data using lowest
2119 * rate. */
2120 fc = hdr->frame_control;
2121 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2122 !sta || !priv_sta) {
2123 sel->rate_idx = rate_lowest_index(sband, sta);
2124 return;
2125 }
2126
2127 lq_sta = (struct iwl_lq_sta *)priv_sta;
2128 i = lq_sta->last_txrate_idx;
2129
2130 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2131 !lq_sta->ibss_sta_added) {
2132 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2133
2134 if (sta_id == IWL_INVALID_STATION) {
2135 IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2136 hdr->addr1);
2137 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2138 0, CMD_ASYNC, NULL);
2139 }
2140 if ((sta_id != IWL_INVALID_STATION)) {
2141 lq_sta->lq.sta_id = sta_id;
2142 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2143 lq_sta->ibss_sta_added = 1;
2144 rs_initialize_lq(priv, conf, sta, lq_sta);
2145 }
2146 }
2147
2148 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2149 sel->rate_idx = rate_lowest_index(sband, sta);
2150 return;
2151 }
2152
2153 if (sband->band == IEEE80211_BAND_5GHZ)
2154 i -= IWL_FIRST_OFDM_RATE;
2155 sel->rate_idx = i;
2156 }
2157
2158 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2159 gfp_t gfp)
2160 {
2161 struct iwl_lq_sta *lq_sta;
2162 struct iwl_priv *priv;
2163 int i, j;
2164
2165 priv = (struct iwl_priv *)priv_rate;
2166 IWL_DEBUG_RATE("create station rate scale window\n");
2167
2168 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2169
2170 if (lq_sta == NULL)
2171 return NULL;
2172 lq_sta->lq.sta_id = 0xff;
2173
2174
2175 for (j = 0; j < LQ_SIZE; j++)
2176 for (i = 0; i < IWL_RATE_COUNT; i++)
2177 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2178
2179 return lq_sta;
2180 }
2181
2182 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2183 struct ieee80211_sta *sta, void *priv_sta)
2184 {
2185 int i, j;
2186 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2187 struct ieee80211_conf *conf = &priv->hw->conf;
2188 struct iwl_lq_sta *lq_sta = priv_sta;
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 /* Find highest tx rate supported by hardware and destination station */
2223 lq_sta->last_txrate_idx = 3;
2224 for (i = 0; i < sband->n_bitrates; i++)
2225 if (sta->supp_rates[sband->band] & BIT(i))
2226 lq_sta->last_txrate_idx = i;
2227
2228 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2229 if (sband->band == IEEE80211_BAND_5GHZ)
2230 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2231
2232 lq_sta->is_dup = 0;
2233 lq_sta->is_green = rs_use_green(priv, conf);
2234 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2235 lq_sta->active_rate_basic = priv->active_rate_basic;
2236 lq_sta->band = priv->band;
2237 /*
2238 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2239 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2240 */
2241 lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2242 lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2243 lq_sta->active_siso_rate &= ~((u16)0x2);
2244 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2245
2246 /* Same here */
2247 lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2248 lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2249 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2250 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2251
2252 lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2253 lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2254 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2255 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2256
2257 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2258 lq_sta->active_siso_rate,
2259 lq_sta->active_mimo2_rate,
2260 lq_sta->active_mimo3_rate);
2261
2262 /* These values will be overriden later */
2263 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2264 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2265
2266 /* as default allow aggregation for all tids */
2267 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2268 lq_sta->drv = priv;
2269
2270 rs_initialize_lq(priv, conf, sta, lq_sta);
2271 }
2272
2273 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2274 struct iwl_lq_sta *lq_sta, u32 new_rate)
2275 {
2276 struct iwl_scale_tbl_info tbl_type;
2277 int index = 0;
2278 int rate_idx;
2279 int repeat_rate = 0;
2280 u8 ant_toggle_cnt = 0;
2281 u8 use_ht_possible = 1;
2282 u8 valid_tx_ant = 0;
2283 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2284
2285 /* Override starting rate (index 0) if needed for debug purposes */
2286 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2287
2288 /* Interpret new_rate (rate_n_flags) */
2289 memset(&tbl_type, 0, sizeof(tbl_type));
2290 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2291 &tbl_type, &rate_idx);
2292
2293 /* How many times should we repeat the initial rate? */
2294 if (is_legacy(tbl_type.lq_type)) {
2295 ant_toggle_cnt = 1;
2296 repeat_rate = IWL_NUMBER_TRY;
2297 } else {
2298 repeat_rate = IWL_HT_NUMBER_TRY;
2299 }
2300
2301 lq_cmd->general_params.mimo_delimiter =
2302 is_mimo(tbl_type.lq_type) ? 1 : 0;
2303
2304 /* Fill 1st table entry (index 0) */
2305 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2306
2307 if (num_of_ant(tbl_type.ant_type) == 1) {
2308 lq_cmd->general_params.single_stream_ant_msk =
2309 tbl_type.ant_type;
2310 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2311 lq_cmd->general_params.dual_stream_ant_msk =
2312 tbl_type.ant_type;
2313 } /* otherwise we don't modify the existing value */
2314
2315 index++;
2316 repeat_rate--;
2317
2318 if (priv)
2319 valid_tx_ant = priv->hw_params.valid_tx_ant;
2320
2321 /* Fill rest of rate table */
2322 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2323 /* Repeat initial/next rate.
2324 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2325 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2326 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2327 if (is_legacy(tbl_type.lq_type)) {
2328 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2329 ant_toggle_cnt++;
2330 else if (priv &&
2331 rs_toggle_antenna(valid_tx_ant,
2332 &new_rate, &tbl_type))
2333 ant_toggle_cnt = 1;
2334 }
2335
2336 /* Override next rate if needed for debug purposes */
2337 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2338
2339 /* Fill next table entry */
2340 lq_cmd->rs_table[index].rate_n_flags =
2341 cpu_to_le32(new_rate);
2342 repeat_rate--;
2343 index++;
2344 }
2345
2346 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2347 &rate_idx);
2348
2349 /* Indicate to uCode which entries might be MIMO.
2350 * If initial rate was MIMO, this will finally end up
2351 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2352 if (is_mimo(tbl_type.lq_type))
2353 lq_cmd->general_params.mimo_delimiter = index;
2354
2355 /* Get next rate */
2356 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2357 use_ht_possible);
2358
2359 /* How many times should we repeat the next rate? */
2360 if (is_legacy(tbl_type.lq_type)) {
2361 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2362 ant_toggle_cnt++;
2363 else if (priv &&
2364 rs_toggle_antenna(valid_tx_ant,
2365 &new_rate, &tbl_type))
2366 ant_toggle_cnt = 1;
2367
2368 repeat_rate = IWL_NUMBER_TRY;
2369 } else {
2370 repeat_rate = IWL_HT_NUMBER_TRY;
2371 }
2372
2373 /* Don't allow HT rates after next pass.
2374 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2375 use_ht_possible = 0;
2376
2377 /* Override next rate if needed for debug purposes */
2378 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2379
2380 /* Fill next table entry */
2381 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2382
2383 index++;
2384 repeat_rate--;
2385 }
2386
2387 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2388 lq_cmd->agg_params.agg_dis_start_th = 3;
2389 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2390 }
2391
2392 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2393 {
2394 return hw->priv;
2395 }
2396 /* rate scale requires free function to be implemented */
2397 static void rs_free(void *priv_rate)
2398 {
2399 return;
2400 }
2401
2402 static void rs_clear(void *priv_rate)
2403 {
2404 #ifdef CONFIG_IWLWIFI_DEBUG
2405 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2406
2407 IWL_DEBUG_RATE("enter\n");
2408
2409 /* TODO - add rate scale state reset */
2410
2411 IWL_DEBUG_RATE("leave\n");
2412 #endif /* CONFIG_IWLWIFI_DEBUG */
2413 }
2414
2415 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2416 void *priv_sta)
2417 {
2418 struct iwl_lq_sta *lq_sta = priv_sta;
2419 struct iwl_priv *priv __maybe_unused = priv_r;
2420
2421 IWL_DEBUG_RATE("enter\n");
2422 kfree(lq_sta);
2423 IWL_DEBUG_RATE("leave\n");
2424 }
2425
2426
2427 #ifdef CONFIG_MAC80211_DEBUGFS
2428 static int open_file_generic(struct inode *inode, struct file *file)
2429 {
2430 file->private_data = inode->i_private;
2431 return 0;
2432 }
2433 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2434 u32 *rate_n_flags, int index)
2435 {
2436 struct iwl_priv *priv;
2437
2438 priv = lq_sta->drv;
2439 if (lq_sta->dbg_fixed_rate) {
2440 if (index < 12) {
2441 *rate_n_flags = lq_sta->dbg_fixed_rate;
2442 } else {
2443 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2444 *rate_n_flags = 0x800D;
2445 else
2446 *rate_n_flags = 0x820A;
2447 }
2448 IWL_DEBUG_RATE("Fixed rate ON\n");
2449 } else {
2450 IWL_DEBUG_RATE("Fixed rate OFF\n");
2451 }
2452 }
2453
2454 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2455 const char __user *user_buf, size_t count, loff_t *ppos)
2456 {
2457 struct iwl_lq_sta *lq_sta = file->private_data;
2458 struct iwl_priv *priv;
2459 char buf[64];
2460 int buf_size;
2461 u32 parsed_rate;
2462
2463 priv = lq_sta->drv;
2464 memset(buf, 0, sizeof(buf));
2465 buf_size = min(count, sizeof(buf) - 1);
2466 if (copy_from_user(buf, user_buf, buf_size))
2467 return -EFAULT;
2468
2469 if (sscanf(buf, "%x", &parsed_rate) == 1)
2470 lq_sta->dbg_fixed_rate = parsed_rate;
2471 else
2472 lq_sta->dbg_fixed_rate = 0;
2473
2474 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2475 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2476 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2477 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2478
2479 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2480 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2481
2482 if (lq_sta->dbg_fixed_rate) {
2483 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2484 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2485 }
2486
2487 return count;
2488 }
2489
2490 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2491 char __user *user_buf, size_t count, loff_t *ppos)
2492 {
2493 char buff[1024];
2494 int desc = 0;
2495 int i = 0;
2496
2497 struct iwl_lq_sta *lq_sta = file->private_data;
2498
2499 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2500 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2501 lq_sta->total_failed, lq_sta->total_success,
2502 lq_sta->active_legacy_rate);
2503 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2504 lq_sta->dbg_fixed_rate);
2505 desc += sprintf(buff+desc, "general:"
2506 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2507 lq_sta->lq.general_params.flags,
2508 lq_sta->lq.general_params.mimo_delimiter,
2509 lq_sta->lq.general_params.single_stream_ant_msk,
2510 lq_sta->lq.general_params.dual_stream_ant_msk);
2511
2512 desc += sprintf(buff+desc, "agg:"
2513 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2514 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2515 lq_sta->lq.agg_params.agg_dis_start_th,
2516 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2517
2518 desc += sprintf(buff+desc,
2519 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2520 lq_sta->lq.general_params.start_rate_index[0],
2521 lq_sta->lq.general_params.start_rate_index[1],
2522 lq_sta->lq.general_params.start_rate_index[2],
2523 lq_sta->lq.general_params.start_rate_index[3]);
2524
2525
2526 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2527 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2528 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2529
2530 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2531 }
2532
2533 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2534 .write = rs_sta_dbgfs_scale_table_write,
2535 .read = rs_sta_dbgfs_scale_table_read,
2536 .open = open_file_generic,
2537 };
2538 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2539 char __user *user_buf, size_t count, loff_t *ppos)
2540 {
2541 char buff[1024];
2542 int desc = 0;
2543 int i, j;
2544
2545 struct iwl_lq_sta *lq_sta = file->private_data;
2546 for (i = 0; i < LQ_SIZE; i++) {
2547 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2548 "rate=0x%X\n",
2549 lq_sta->active_tbl == i?"*":"x",
2550 lq_sta->lq_info[i].lq_type,
2551 lq_sta->lq_info[i].is_SGI,
2552 lq_sta->lq_info[i].is_fat,
2553 lq_sta->lq_info[i].is_dup,
2554 lq_sta->lq_info[i].current_rate);
2555 for (j = 0; j < IWL_RATE_COUNT; j++) {
2556 desc += sprintf(buff+desc,
2557 "counter=%d success=%d %%=%d\n",
2558 lq_sta->lq_info[i].win[j].counter,
2559 lq_sta->lq_info[i].win[j].success_counter,
2560 lq_sta->lq_info[i].win[j].success_ratio);
2561 }
2562 }
2563 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2564 }
2565
2566 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2567 .read = rs_sta_dbgfs_stats_table_read,
2568 .open = open_file_generic,
2569 };
2570
2571 static void rs_add_debugfs(void *priv, void *priv_sta,
2572 struct dentry *dir)
2573 {
2574 struct iwl_lq_sta *lq_sta = priv_sta;
2575 lq_sta->rs_sta_dbgfs_scale_table_file =
2576 debugfs_create_file("rate_scale_table", 0600, dir,
2577 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2578 lq_sta->rs_sta_dbgfs_stats_table_file =
2579 debugfs_create_file("rate_stats_table", 0600, dir,
2580 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2581 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2582 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2583 &lq_sta->tx_agg_tid_en);
2584
2585 }
2586
2587 static void rs_remove_debugfs(void *priv, void *priv_sta)
2588 {
2589 struct iwl_lq_sta *lq_sta = priv_sta;
2590 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2591 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2592 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2593 }
2594 #endif
2595
2596 static struct rate_control_ops rs_ops = {
2597 .module = NULL,
2598 .name = RS_NAME,
2599 .tx_status = rs_tx_status,
2600 .get_rate = rs_get_rate,
2601 .rate_init = rs_rate_init,
2602 .clear = rs_clear,
2603 .alloc = rs_alloc,
2604 .free = rs_free,
2605 .alloc_sta = rs_alloc_sta,
2606 .free_sta = rs_free_sta,
2607 #ifdef CONFIG_MAC80211_DEBUGFS
2608 .add_sta_debugfs = rs_add_debugfs,
2609 .remove_sta_debugfs = rs_remove_debugfs,
2610 #endif
2611 };
2612
2613 int iwlagn_rate_control_register(void)
2614 {
2615 return ieee80211_rate_control_register(&rs_ops);
2616 }
2617
2618 void iwlagn_rate_control_unregister(void)
2619 {
2620 ieee80211_rate_control_unregister(&rs_ops);
2621 }
2622
Linux kernel - Deliverables
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