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Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[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 "../net/mac80211/rate.h"
39
40 #include "iwl-dev.h"
41 #include "iwl-sta.h"
42 #include "iwl-core.h"
43 #include "iwl-helpers.h"
44
45 #define RS_NAME "iwl-agn-rs"
46
47 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
48 #define IWL_NUMBER_TRY 1
49 #define IWL_HT_NUMBER_TRY 3
50
51 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
52 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
53 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
54
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
57
58 static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66 };
67
68 static const u8 ant_toggle_lookup[] = {
69 /*ANT_NONE -> */ ANT_NONE,
70 /*ANT_A -> */ ANT_B,
71 /*ANT_B -> */ ANT_C,
72 /*ANT_AB -> */ ANT_BC,
73 /*ANT_C -> */ ANT_A,
74 /*ANT_AC -> */ ANT_AB,
75 /*ANT_BC -> */ ANT_AC,
76 /*ANT_ABC -> */ ANT_ABC,
77 };
78
79 /**
80 * struct iwl_rate_scale_data -- tx success history for one rate
81 */
82 struct iwl_rate_scale_data {
83 u64 data; /* bitmap of successful frames */
84 s32 success_counter; /* number of frames successful */
85 s32 success_ratio; /* per-cent * 128 */
86 s32 counter; /* number of frames attempted */
87 s32 average_tpt; /* success ratio * expected throughput */
88 unsigned long stamp;
89 };
90
91 /**
92 * struct iwl_scale_tbl_info -- tx params and success history for all rates
93 *
94 * There are two of these in struct iwl_lq_sta,
95 * one for "active", and one for "search".
96 */
97 struct iwl_scale_tbl_info {
98 enum iwl_table_type lq_type;
99 u8 ant_type;
100 u8 is_SGI; /* 1 = short guard interval */
101 u8 is_fat; /* 1 = 40 MHz channel width */
102 u8 is_dup; /* 1 = duplicated data streams */
103 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
104 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
105 u32 current_rate; /* rate_n_flags, uCode API format */
106 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
107 };
108
109 struct iwl_traffic_load {
110 unsigned long time_stamp; /* age of the oldest statistics */
111 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
112 * slice */
113 u32 total; /* total num of packets during the
114 * last TID_MAX_TIME_DIFF */
115 u8 queue_count; /* number of queues that has
116 * been used since the last cleanup */
117 u8 head; /* start of the circular buffer */
118 };
119
120 /**
121 * struct iwl_lq_sta -- driver's rate scaling private structure
122 *
123 * Pointer to this gets passed back and forth between driver and mac80211.
124 */
125 struct iwl_lq_sta {
126 u8 active_tbl; /* index of active table, range 0-1 */
127 u8 enable_counter; /* indicates HT mode */
128 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
129 u8 search_better_tbl; /* 1: currently trying alternate mode */
130 s32 last_tpt;
131
132 /* The following determine when to search for a new mode */
133 u32 table_count_limit;
134 u32 max_failure_limit; /* # failed frames before new search */
135 u32 max_success_limit; /* # successful frames before new search */
136 u32 table_count;
137 u32 total_failed; /* total failed frames, any/all rates */
138 u32 total_success; /* total successful frames, any/all rates */
139 u32 flush_timer; /* time staying in mode before new search */
140
141 u8 action_counter; /* # mode-switch actions tried */
142 u8 is_green;
143 u8 is_dup;
144 enum ieee80211_band band;
145 u8 ibss_sta_added;
146
147 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
148 u32 supp_rates;
149 u16 active_legacy_rate;
150 u16 active_siso_rate;
151 u16 active_mimo2_rate;
152 u16 active_mimo3_rate;
153 u16 active_rate_basic;
154
155 struct iwl_link_quality_cmd lq;
156 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
157 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
158 u8 tx_agg_tid_en;
159 #ifdef CONFIG_MAC80211_DEBUGFS
160 struct dentry *rs_sta_dbgfs_scale_table_file;
161 struct dentry *rs_sta_dbgfs_stats_table_file;
162 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
163 u32 dbg_fixed_rate;
164 #endif
165 struct iwl_priv *drv;
166 };
167
168 static void rs_rate_scale_perform(struct iwl_priv *priv,
169 struct net_device *dev,
170 struct ieee80211_hdr *hdr,
171 struct sta_info *sta);
172 static void rs_fill_link_cmd(const struct iwl_priv *priv,
173 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
174
175
176 #ifdef CONFIG_MAC80211_DEBUGFS
177 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
178 u32 *rate_n_flags, int index);
179 #else
180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
181 u32 *rate_n_flags, int index)
182 {}
183 #endif
184
185 /*
186 * Expected throughput metrics for following rates:
187 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
188 * "G" is the only table that supports CCK (the first 4 rates).
189 */
190 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
192 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
193 };
194
195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
196 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
197 };
198
199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
201 };
202
203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
204 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
205 };
206
207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
209 };
210
211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
213 };
214
215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
216 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
217 };
218
219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
220 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
221 };
222
223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
225 };
226
227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
229 };
230
231 static inline u8 rs_extract_rate(u32 rate_n_flags)
232 {
233 return (u8)(rate_n_flags & 0xFF);
234 }
235
236 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
237 {
238 window->data = 0;
239 window->success_counter = 0;
240 window->success_ratio = IWL_INVALID_VALUE;
241 window->counter = 0;
242 window->average_tpt = IWL_INVALID_VALUE;
243 window->stamp = 0;
244 }
245
246 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
247 {
248 return (ant_type & valid_antenna) == ant_type;
249 }
250
251 /*
252 * removes the old data from the statistics. All data that is older than
253 * TID_MAX_TIME_DIFF, will be deleted.
254 */
255 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
256 {
257 /* The oldest age we want to keep */
258 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
259
260 while (tl->queue_count &&
261 (tl->time_stamp < oldest_time)) {
262 tl->total -= tl->packet_count[tl->head];
263 tl->packet_count[tl->head] = 0;
264 tl->time_stamp += TID_QUEUE_CELL_SPACING;
265 tl->queue_count--;
266 tl->head++;
267 if (tl->head >= TID_QUEUE_MAX_SIZE)
268 tl->head = 0;
269 }
270 }
271
272 /*
273 * increment traffic load value for tid and also remove
274 * any old values if passed the certain time period
275 */
276 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
277 struct ieee80211_hdr *hdr)
278 {
279 u32 curr_time = jiffies_to_msecs(jiffies);
280 u32 time_diff;
281 s32 index;
282 struct iwl_traffic_load *tl = NULL;
283 __le16 fc = hdr->frame_control;
284 u8 tid;
285
286 if (ieee80211_is_data_qos(fc)) {
287 u8 *qc = ieee80211_get_qos_ctl(hdr);
288 tid = qc[0] & 0xf;
289 } else
290 return MAX_TID_COUNT;
291
292 tl = &lq_data->load[tid];
293
294 curr_time -= curr_time % TID_ROUND_VALUE;
295
296 /* Happens only for the first packet. Initialize the data */
297 if (!(tl->queue_count)) {
298 tl->total = 1;
299 tl->time_stamp = curr_time;
300 tl->queue_count = 1;
301 tl->head = 0;
302 tl->packet_count[0] = 1;
303 return MAX_TID_COUNT;
304 }
305
306 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
307 index = time_diff / TID_QUEUE_CELL_SPACING;
308
309 /* The history is too long: remove data that is older than */
310 /* TID_MAX_TIME_DIFF */
311 if (index >= TID_QUEUE_MAX_SIZE)
312 rs_tl_rm_old_stats(tl, curr_time);
313
314 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
315 tl->packet_count[index] = tl->packet_count[index] + 1;
316 tl->total = tl->total + 1;
317
318 if ((index + 1) > tl->queue_count)
319 tl->queue_count = index + 1;
320
321 return tid;
322 }
323
324 /*
325 get the traffic load value for tid
326 */
327 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
328 {
329 u32 curr_time = jiffies_to_msecs(jiffies);
330 u32 time_diff;
331 s32 index;
332 struct iwl_traffic_load *tl = NULL;
333
334 if (tid >= TID_MAX_LOAD_COUNT)
335 return 0;
336
337 tl = &(lq_data->load[tid]);
338
339 curr_time -= curr_time % TID_ROUND_VALUE;
340
341 if (!(tl->queue_count))
342 return 0;
343
344 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
345 index = time_diff / TID_QUEUE_CELL_SPACING;
346
347 /* The history is too long: remove data that is older than */
348 /* TID_MAX_TIME_DIFF */
349 if (index >= TID_QUEUE_MAX_SIZE)
350 rs_tl_rm_old_stats(tl, curr_time);
351
352 return tl->total;
353 }
354
355 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
356 struct iwl_lq_sta *lq_data, u8 tid,
357 struct sta_info *sta)
358 {
359 unsigned long state;
360 DECLARE_MAC_BUF(mac);
361
362 spin_lock_bh(&sta->lock);
363 state = sta->ampdu_mlme.tid_state_tx[tid];
364 spin_unlock_bh(&sta->lock);
365
366 if (state == HT_AGG_STATE_IDLE &&
367 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
368 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
369 print_mac(mac, sta->addr), tid);
370 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
371 }
372 }
373
374 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
375 struct iwl_lq_sta *lq_data,
376 struct sta_info *sta)
377 {
378 if ((tid < TID_MAX_LOAD_COUNT))
379 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
380 else if (tid == IWL_AGG_ALL_TID)
381 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
382 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
383 }
384
385 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
386 {
387 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
388 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
389 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
390 }
391
392 /**
393 * rs_collect_tx_data - Update the success/failure sliding window
394 *
395 * We keep a sliding window of the last 62 packets transmitted
396 * at this rate. window->data contains the bitmask of successful
397 * packets.
398 */
399 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
400 int scale_index, s32 tpt, int retries,
401 int successes)
402 {
403 struct iwl_rate_scale_data *window = NULL;
404 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
405 s32 fail_count;
406
407 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
408 return -EINVAL;
409
410 /* Select data for current tx bit rate */
411 window = &(windows[scale_index]);
412
413 /*
414 * Keep track of only the latest 62 tx frame attempts in this rate's
415 * history window; anything older isn't really relevant any more.
416 * If we have filled up the sliding window, drop the oldest attempt;
417 * if the oldest attempt (highest bit in bitmap) shows "success",
418 * subtract "1" from the success counter (this is the main reason
419 * we keep these bitmaps!).
420 */
421 while (retries > 0) {
422 if (window->counter >= IWL_RATE_MAX_WINDOW) {
423
424 /* remove earliest */
425 window->counter = IWL_RATE_MAX_WINDOW - 1;
426
427 if (window->data & mask) {
428 window->data &= ~mask;
429 window->success_counter--;
430 }
431 }
432
433 /* Increment frames-attempted counter */
434 window->counter++;
435
436 /* Shift bitmap by one frame (throw away oldest history),
437 * OR in "1", and increment "success" if this
438 * frame was successful. */
439 window->data <<= 1;;
440 if (successes > 0) {
441 window->success_counter++;
442 window->data |= 0x1;
443 successes--;
444 }
445
446 retries--;
447 }
448
449 /* Calculate current success ratio, avoid divide-by-0! */
450 if (window->counter > 0)
451 window->success_ratio = 128 * (100 * window->success_counter)
452 / window->counter;
453 else
454 window->success_ratio = IWL_INVALID_VALUE;
455
456 fail_count = window->counter - window->success_counter;
457
458 /* Calculate average throughput, if we have enough history. */
459 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
460 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
461 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
462 else
463 window->average_tpt = IWL_INVALID_VALUE;
464
465 /* Tag this window as having been updated */
466 window->stamp = jiffies;
467
468 return 0;
469 }
470
471 /*
472 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
473 */
474 /* FIXME:RS:remove this function and put the flags statically in the table */
475 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
476 int index, u8 use_green)
477 {
478 u32 rate_n_flags = 0;
479
480 if (is_legacy(tbl->lq_type)) {
481 rate_n_flags = iwl_rates[index].plcp;
482 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
483 rate_n_flags |= RATE_MCS_CCK_MSK;
484
485 } else if (is_Ht(tbl->lq_type)) {
486 if (index > IWL_LAST_OFDM_RATE) {
487 IWL_ERROR("invalid HT rate index %d\n", index);
488 index = IWL_LAST_OFDM_RATE;
489 }
490 rate_n_flags = RATE_MCS_HT_MSK;
491
492 if (is_siso(tbl->lq_type))
493 rate_n_flags |= iwl_rates[index].plcp_siso;
494 else if (is_mimo2(tbl->lq_type))
495 rate_n_flags |= iwl_rates[index].plcp_mimo2;
496 else
497 rate_n_flags |= iwl_rates[index].plcp_mimo3;
498 } else {
499 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
500 }
501
502 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
503 RATE_MCS_ANT_ABC_MSK);
504
505 if (is_Ht(tbl->lq_type)) {
506 if (tbl->is_fat) {
507 if (tbl->is_dup)
508 rate_n_flags |= RATE_MCS_DUP_MSK;
509 else
510 rate_n_flags |= RATE_MCS_FAT_MSK;
511 }
512 if (tbl->is_SGI)
513 rate_n_flags |= RATE_MCS_SGI_MSK;
514
515 if (use_green) {
516 rate_n_flags |= RATE_MCS_GF_MSK;
517 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
518 rate_n_flags &= ~RATE_MCS_SGI_MSK;
519 IWL_ERROR("GF was set with SGI:SISO\n");
520 }
521 }
522 }
523 return rate_n_flags;
524 }
525
526 /*
527 * Interpret uCode API's rate_n_flags format,
528 * fill "search" or "active" tx mode table.
529 */
530 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
531 enum ieee80211_band band,
532 struct iwl_scale_tbl_info *tbl,
533 int *rate_idx)
534 {
535 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
536 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
537 u8 mcs;
538
539 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
540
541 if (*rate_idx == IWL_RATE_INVALID) {
542 *rate_idx = -1;
543 return -EINVAL;
544 }
545 tbl->is_SGI = 0; /* default legacy setup */
546 tbl->is_fat = 0;
547 tbl->is_dup = 0;
548 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
549 tbl->lq_type = LQ_NONE;
550
551 /* legacy rate format */
552 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
553 if (num_of_ant == 1) {
554 if (band == IEEE80211_BAND_5GHZ)
555 tbl->lq_type = LQ_A;
556 else
557 tbl->lq_type = LQ_G;
558 }
559 /* HT rate format */
560 } else {
561 if (rate_n_flags & RATE_MCS_SGI_MSK)
562 tbl->is_SGI = 1;
563
564 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
565 (rate_n_flags & RATE_MCS_DUP_MSK))
566 tbl->is_fat = 1;
567
568 if (rate_n_flags & RATE_MCS_DUP_MSK)
569 tbl->is_dup = 1;
570
571 mcs = rs_extract_rate(rate_n_flags);
572
573 /* SISO */
574 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
575 if (num_of_ant == 1)
576 tbl->lq_type = LQ_SISO; /*else NONE*/
577 /* MIMO2 */
578 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
579 if (num_of_ant == 2)
580 tbl->lq_type = LQ_MIMO2;
581 /* MIMO3 */
582 } else {
583 if (num_of_ant == 3)
584 tbl->lq_type = LQ_MIMO3;
585 }
586 }
587 return 0;
588 }
589
590 /* switch to another antenna/antennas and return 1 */
591 /* if no other valid antenna found, return 0 */
592 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
593 struct iwl_scale_tbl_info *tbl)
594 {
595 u8 new_ant_type;
596
597 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
598 return 0;
599
600 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
601 return 0;
602
603 new_ant_type = ant_toggle_lookup[tbl->ant_type];
604
605 while ((new_ant_type != tbl->ant_type) &&
606 !rs_is_valid_ant(valid_ant, new_ant_type))
607 new_ant_type = ant_toggle_lookup[new_ant_type];
608
609 if (new_ant_type == tbl->ant_type)
610 return 0;
611
612 tbl->ant_type = new_ant_type;
613 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
614 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
615 return 1;
616 }
617
618 /* FIXME:RS: in 4965 we don't use greenfield at all */
619 /* FIXME:RS: don't use greenfield for now in TX */
620 #if 0
621 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
622 {
623 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
624 priv->current_ht_config.is_green_field &&
625 !priv->current_ht_config.non_GF_STA_present;
626 }
627 #endif
628 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
629 {
630 return 0;
631 }
632
633 /**
634 * rs_get_supported_rates - get the available rates
635 *
636 * if management frame or broadcast frame only return
637 * basic available rates.
638 *
639 */
640 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
641 struct ieee80211_hdr *hdr,
642 enum iwl_table_type rate_type)
643 {
644 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
645 lq_sta->active_rate_basic)
646 return lq_sta->active_rate_basic;
647
648 if (is_legacy(rate_type)) {
649 return lq_sta->active_legacy_rate;
650 } else {
651 if (is_siso(rate_type))
652 return lq_sta->active_siso_rate;
653 else if (is_mimo2(rate_type))
654 return lq_sta->active_mimo2_rate;
655 else
656 return lq_sta->active_mimo3_rate;
657 }
658 }
659
660 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
661 int rate_type)
662 {
663 u8 high = IWL_RATE_INVALID;
664 u8 low = IWL_RATE_INVALID;
665
666 /* 802.11A or ht walks to the next literal adjacent rate in
667 * the rate table */
668 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
669 int i;
670 u32 mask;
671
672 /* Find the previous rate that is in the rate mask */
673 i = index - 1;
674 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
675 if (rate_mask & mask) {
676 low = i;
677 break;
678 }
679 }
680
681 /* Find the next rate that is in the rate mask */
682 i = index + 1;
683 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
684 if (rate_mask & mask) {
685 high = i;
686 break;
687 }
688 }
689
690 return (high << 8) | low;
691 }
692
693 low = index;
694 while (low != IWL_RATE_INVALID) {
695 low = iwl_rates[low].prev_rs;
696 if (low == IWL_RATE_INVALID)
697 break;
698 if (rate_mask & (1 << low))
699 break;
700 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
701 }
702
703 high = index;
704 while (high != IWL_RATE_INVALID) {
705 high = iwl_rates[high].next_rs;
706 if (high == IWL_RATE_INVALID)
707 break;
708 if (rate_mask & (1 << high))
709 break;
710 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
711 }
712
713 return (high << 8) | low;
714 }
715
716 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
717 struct iwl_scale_tbl_info *tbl,
718 u8 scale_index, u8 ht_possible)
719 {
720 s32 low;
721 u16 rate_mask;
722 u16 high_low;
723 u8 switch_to_legacy = 0;
724 u8 is_green = lq_sta->is_green;
725
726 /* check if we need to switch from HT to legacy rates.
727 * assumption is that mandatory rates (1Mbps or 6Mbps)
728 * are always supported (spec demand) */
729 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
730 switch_to_legacy = 1;
731 scale_index = rs_ht_to_legacy[scale_index];
732 if (lq_sta->band == IEEE80211_BAND_5GHZ)
733 tbl->lq_type = LQ_A;
734 else
735 tbl->lq_type = LQ_G;
736
737 if (num_of_ant(tbl->ant_type) > 1)
738 tbl->ant_type = ANT_A;/*FIXME:RS*/
739
740 tbl->is_fat = 0;
741 tbl->is_SGI = 0;
742 }
743
744 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
745
746 /* Mask with station rate restriction */
747 if (is_legacy(tbl->lq_type)) {
748 /* supp_rates has no CCK bits in A mode */
749 if (lq_sta->band == IEEE80211_BAND_5GHZ)
750 rate_mask = (u16)(rate_mask &
751 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
752 else
753 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
754 }
755
756 /* If we switched from HT to legacy, check current rate */
757 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
758 low = scale_index;
759 goto out;
760 }
761
762 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
763 tbl->lq_type);
764 low = high_low & 0xff;
765
766 if (low == IWL_RATE_INVALID)
767 low = scale_index;
768
769 out:
770 return rate_n_flags_from_tbl(tbl, low, is_green);
771 }
772
773 /*
774 * mac80211 sends us Tx status
775 */
776 static void rs_tx_status(void *priv_rate, struct net_device *dev,
777 struct sk_buff *skb)
778 {
779 int status;
780 u8 retries;
781 int rs_index, index = 0;
782 struct iwl_lq_sta *lq_sta;
783 struct iwl_link_quality_cmd *table;
784 struct sta_info *sta;
785 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
786 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
787 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
788 struct ieee80211_hw *hw = local_to_hw(local);
789 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
790 struct iwl_rate_scale_data *window = NULL;
791 struct iwl_rate_scale_data *search_win = NULL;
792 u32 tx_rate;
793 struct iwl_scale_tbl_info tbl_type;
794 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
795 u8 active_index = 0;
796 __le16 fc = hdr->frame_control;
797 s32 tpt = 0;
798
799 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
800
801 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
802 return;
803
804 /* This packet was aggregated but doesn't carry rate scale info */
805 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
806 !(info->flags & IEEE80211_TX_STAT_AMPDU))
807 return;
808
809 retries = info->status.retry_count;
810
811 if (retries > 15)
812 retries = 15;
813
814 rcu_read_lock();
815
816 sta = sta_info_get(local, hdr->addr1);
817
818 if (!sta || !sta->rate_ctrl_priv)
819 goto out;
820
821
822 lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
823
824 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
825 !lq_sta->ibss_sta_added)
826 goto out;
827
828 table = &lq_sta->lq;
829 active_index = lq_sta->active_tbl;
830
831 curr_tbl = &(lq_sta->lq_info[active_index]);
832 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
833 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
834 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
835
836 /*
837 * Ignore this Tx frame response if its initial rate doesn't match
838 * that of latest Link Quality command. There may be stragglers
839 * from a previous Link Quality command, but we're no longer interested
840 * in those; they're either from the "active" mode while we're trying
841 * to check "search" mode, or a prior "search" mode after we've moved
842 * to a new "search" mode (which might become the new "active" mode).
843 */
844 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
845 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
846 if (priv->band == IEEE80211_BAND_5GHZ)
847 rs_index -= IWL_FIRST_OFDM_RATE;
848
849 if ((info->tx_rate_idx < 0) ||
850 (tbl_type.is_SGI ^
851 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
852 (tbl_type.is_fat ^
853 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
854 (tbl_type.is_dup ^
855 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
856 (tbl_type.ant_type ^ info->antenna_sel_tx) ||
857 (!!(tx_rate & RATE_MCS_HT_MSK) ^
858 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
859 (!!(tx_rate & RATE_MCS_GF_MSK) ^
860 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
861 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
862 hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
863 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
864 goto out;
865 }
866
867 /* Update frame history window with "failure" for each Tx retry. */
868 while (retries) {
869 /* Look up the rate and other info used for each tx attempt.
870 * Each tx attempt steps one entry deeper in the rate table. */
871 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
872 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
873 &tbl_type, &rs_index);
874
875 /* If type matches "search" table,
876 * add failure to "search" history */
877 if ((tbl_type.lq_type == search_tbl->lq_type) &&
878 (tbl_type.ant_type == search_tbl->ant_type) &&
879 (tbl_type.is_SGI == search_tbl->is_SGI)) {
880 if (search_tbl->expected_tpt)
881 tpt = search_tbl->expected_tpt[rs_index];
882 else
883 tpt = 0;
884 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
885
886 /* Else if type matches "current/active" table,
887 * add failure to "current/active" history */
888 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
889 (tbl_type.ant_type == curr_tbl->ant_type) &&
890 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
891 if (curr_tbl->expected_tpt)
892 tpt = curr_tbl->expected_tpt[rs_index];
893 else
894 tpt = 0;
895 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
896 }
897
898 /* If not searching for a new mode, increment failed counter
899 * ... this helps determine when to start searching again */
900 if (lq_sta->stay_in_tbl)
901 lq_sta->total_failed++;
902 --retries;
903 index++;
904
905 }
906
907 /*
908 * Find (by rate) the history window to update with final Tx attempt;
909 * if Tx was successful first try, use original rate,
910 * else look up the rate that was, finally, successful.
911 */
912 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
913 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
914
915 /* Update frame history window with "success" if Tx got ACKed ... */
916 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
917
918 /* If type matches "search" table,
919 * add final tx status to "search" history */
920 if ((tbl_type.lq_type == search_tbl->lq_type) &&
921 (tbl_type.ant_type == search_tbl->ant_type) &&
922 (tbl_type.is_SGI == search_tbl->is_SGI)) {
923 if (search_tbl->expected_tpt)
924 tpt = search_tbl->expected_tpt[rs_index];
925 else
926 tpt = 0;
927 if (info->flags & IEEE80211_TX_CTL_AMPDU)
928 rs_collect_tx_data(search_win, rs_index, tpt,
929 info->status.ampdu_ack_len,
930 info->status.ampdu_ack_map);
931 else
932 rs_collect_tx_data(search_win, rs_index, tpt,
933 1, status);
934 /* Else if type matches "current/active" table,
935 * add final tx status to "current/active" history */
936 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
937 (tbl_type.ant_type == curr_tbl->ant_type) &&
938 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
939 if (curr_tbl->expected_tpt)
940 tpt = curr_tbl->expected_tpt[rs_index];
941 else
942 tpt = 0;
943 if (info->flags & IEEE80211_TX_CTL_AMPDU)
944 rs_collect_tx_data(window, rs_index, tpt,
945 info->status.ampdu_ack_len,
946 info->status.ampdu_ack_map);
947 else
948 rs_collect_tx_data(window, rs_index, tpt,
949 1, status);
950 }
951
952 /* If not searching for new mode, increment success/failed counter
953 * ... these help determine when to start searching again */
954 if (lq_sta->stay_in_tbl) {
955 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
956 lq_sta->total_success += info->status.ampdu_ack_map;
957 lq_sta->total_failed +=
958 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
959 } else {
960 if (status)
961 lq_sta->total_success++;
962 else
963 lq_sta->total_failed++;
964 }
965 }
966
967 /* See if there's a better rate or modulation mode to try. */
968 rs_rate_scale_perform(priv, dev, hdr, sta);
969 out:
970 rcu_read_unlock();
971 return;
972 }
973
974 /*
975 * Begin a period of staying with a selected modulation mode.
976 * Set "stay_in_tbl" flag to prevent any mode switches.
977 * Set frame tx success limits according to legacy vs. high-throughput,
978 * and reset overall (spanning all rates) tx success history statistics.
979 * These control how long we stay using same modulation mode before
980 * searching for a new mode.
981 */
982 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
983 struct iwl_lq_sta *lq_sta)
984 {
985 IWL_DEBUG_RATE("we are staying in the same table\n");
986 lq_sta->stay_in_tbl = 1; /* only place this gets set */
987 if (is_legacy) {
988 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
989 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
990 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
991 } else {
992 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
993 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
994 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
995 }
996 lq_sta->table_count = 0;
997 lq_sta->total_failed = 0;
998 lq_sta->total_success = 0;
999 }
1000
1001 /*
1002 * Find correct throughput table for given mode of modulation
1003 */
1004 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1005 struct iwl_scale_tbl_info *tbl)
1006 {
1007 if (is_legacy(tbl->lq_type)) {
1008 if (!is_a_band(tbl->lq_type))
1009 tbl->expected_tpt = expected_tpt_G;
1010 else
1011 tbl->expected_tpt = expected_tpt_A;
1012 } else if (is_siso(tbl->lq_type)) {
1013 if (tbl->is_fat && !lq_sta->is_dup)
1014 if (tbl->is_SGI)
1015 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1016 else
1017 tbl->expected_tpt = expected_tpt_siso40MHz;
1018 else if (tbl->is_SGI)
1019 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1020 else
1021 tbl->expected_tpt = expected_tpt_siso20MHz;
1022
1023 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1024 if (tbl->is_fat && !lq_sta->is_dup)
1025 if (tbl->is_SGI)
1026 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1027 else
1028 tbl->expected_tpt = expected_tpt_mimo40MHz;
1029 else if (tbl->is_SGI)
1030 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1031 else
1032 tbl->expected_tpt = expected_tpt_mimo20MHz;
1033 } else
1034 tbl->expected_tpt = expected_tpt_G;
1035 }
1036
1037 /*
1038 * Find starting rate for new "search" high-throughput mode of modulation.
1039 * Goal is to find lowest expected rate (under perfect conditions) that is
1040 * above the current measured throughput of "active" mode, to give new mode
1041 * a fair chance to prove itself without too many challenges.
1042 *
1043 * This gets called when transitioning to more aggressive modulation
1044 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1045 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1046 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1047 * bit rate will typically need to increase, but not if performance was bad.
1048 */
1049 static s32 rs_get_best_rate(struct iwl_priv *priv,
1050 struct iwl_lq_sta *lq_sta,
1051 struct iwl_scale_tbl_info *tbl, /* "search" */
1052 u16 rate_mask, s8 index)
1053 {
1054 /* "active" values */
1055 struct iwl_scale_tbl_info *active_tbl =
1056 &(lq_sta->lq_info[lq_sta->active_tbl]);
1057 s32 active_sr = active_tbl->win[index].success_ratio;
1058 s32 active_tpt = active_tbl->expected_tpt[index];
1059
1060 /* expected "search" throughput */
1061 s32 *tpt_tbl = tbl->expected_tpt;
1062
1063 s32 new_rate, high, low, start_hi;
1064 u16 high_low;
1065 s8 rate = index;
1066
1067 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1068
1069 for (; ;) {
1070 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1071 tbl->lq_type);
1072
1073 low = high_low & 0xff;
1074 high = (high_low >> 8) & 0xff;
1075
1076 /*
1077 * Lower the "search" bit rate, to give new "search" mode
1078 * approximately the same throughput as "active" if:
1079 *
1080 * 1) "Active" mode has been working modestly well (but not
1081 * great), and expected "search" throughput (under perfect
1082 * conditions) at candidate rate is above the actual
1083 * measured "active" throughput (but less than expected
1084 * "active" throughput under perfect conditions).
1085 * OR
1086 * 2) "Active" mode has been working perfectly or very well
1087 * and expected "search" throughput (under perfect
1088 * conditions) at candidate rate is above expected
1089 * "active" throughput (under perfect conditions).
1090 */
1091 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1092 ((active_sr > IWL_RATE_DECREASE_TH) &&
1093 (active_sr <= IWL_RATE_HIGH_TH) &&
1094 (tpt_tbl[rate] <= active_tpt))) ||
1095 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1096 (tpt_tbl[rate] > active_tpt))) {
1097
1098 /* (2nd or later pass)
1099 * If we've already tried to raise the rate, and are
1100 * now trying to lower it, use the higher rate. */
1101 if (start_hi != IWL_RATE_INVALID) {
1102 new_rate = start_hi;
1103 break;
1104 }
1105
1106 new_rate = rate;
1107
1108 /* Loop again with lower rate */
1109 if (low != IWL_RATE_INVALID)
1110 rate = low;
1111
1112 /* Lower rate not available, use the original */
1113 else
1114 break;
1115
1116 /* Else try to raise the "search" rate to match "active" */
1117 } else {
1118 /* (2nd or later pass)
1119 * If we've already tried to lower the rate, and are
1120 * now trying to raise it, use the lower rate. */
1121 if (new_rate != IWL_RATE_INVALID)
1122 break;
1123
1124 /* Loop again with higher rate */
1125 else if (high != IWL_RATE_INVALID) {
1126 start_hi = high;
1127 rate = high;
1128
1129 /* Higher rate not available, use the original */
1130 } else {
1131 break;
1132 }
1133 }
1134 }
1135
1136 return new_rate;
1137 }
1138
1139 /*
1140 * Set up search table for MIMO
1141 */
1142 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1143 struct iwl_lq_sta *lq_sta,
1144 struct ieee80211_conf *conf,
1145 struct sta_info *sta,
1146 struct iwl_scale_tbl_info *tbl, int index)
1147 {
1148 u16 rate_mask;
1149 s32 rate;
1150 s8 is_green = lq_sta->is_green;
1151
1152 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1153 !sta->ht_info.ht_supported)
1154 return -1;
1155
1156 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1157 return -1;
1158
1159 /* Need both Tx chains/antennas to support MIMO */
1160 if (priv->hw_params.tx_chains_num < 2)
1161 return -1;
1162
1163 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1164
1165 tbl->lq_type = LQ_MIMO2;
1166 tbl->is_dup = lq_sta->is_dup;
1167 tbl->action = 0;
1168 rate_mask = lq_sta->active_mimo2_rate;
1169
1170 if (priv->current_ht_config.supported_chan_width
1171 == IWL_CHANNEL_WIDTH_40MHZ)
1172 tbl->is_fat = 1;
1173 else
1174 tbl->is_fat = 0;
1175
1176 /* FIXME: - don't toggle SGI here
1177 if (tbl->is_fat) {
1178 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1179 tbl->is_SGI = 1;
1180 else
1181 tbl->is_SGI = 0;
1182 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1183 tbl->is_SGI = 1;
1184 else
1185 tbl->is_SGI = 0;
1186 */
1187
1188 rs_set_expected_tpt_table(lq_sta, tbl);
1189
1190 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1191
1192 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1193
1194 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1195 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1196 rate, rate_mask);
1197 return -1;
1198 }
1199 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1200
1201 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1202 tbl->current_rate, is_green);
1203 return 0;
1204 }
1205
1206 /*
1207 * Set up search table for SISO
1208 */
1209 static int rs_switch_to_siso(struct iwl_priv *priv,
1210 struct iwl_lq_sta *lq_sta,
1211 struct ieee80211_conf *conf,
1212 struct sta_info *sta,
1213 struct iwl_scale_tbl_info *tbl, int index)
1214 {
1215 u16 rate_mask;
1216 u8 is_green = lq_sta->is_green;
1217 s32 rate;
1218
1219 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1220 !sta->ht_info.ht_supported)
1221 return -1;
1222
1223 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1224
1225 tbl->is_dup = lq_sta->is_dup;
1226 tbl->lq_type = LQ_SISO;
1227 tbl->action = 0;
1228 rate_mask = lq_sta->active_siso_rate;
1229
1230 if (priv->current_ht_config.supported_chan_width
1231 == IWL_CHANNEL_WIDTH_40MHZ)
1232 tbl->is_fat = 1;
1233 else
1234 tbl->is_fat = 0;
1235
1236 /* FIXME: - don't toggle SGI here
1237 if (tbl->is_fat) {
1238 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1239 tbl->is_SGI = 1;
1240 else
1241 tbl->is_SGI = 0;
1242 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1243 tbl->is_SGI = 1;
1244 else
1245 tbl->is_SGI = 0;
1246 */
1247
1248 if (is_green)
1249 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1250
1251 rs_set_expected_tpt_table(lq_sta, tbl);
1252 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1253
1254 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1255 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1256 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1257 rate, rate_mask);
1258 return -1;
1259 }
1260 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1261 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1262 tbl->current_rate, is_green);
1263 return 0;
1264 }
1265
1266 /*
1267 * Try to switch to new modulation mode from legacy
1268 */
1269 static int rs_move_legacy_other(struct iwl_priv *priv,
1270 struct iwl_lq_sta *lq_sta,
1271 struct ieee80211_conf *conf,
1272 struct sta_info *sta,
1273 int index)
1274 {
1275 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1276 struct iwl_scale_tbl_info *search_tbl =
1277 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1278 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1279 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1280 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1281 u8 start_action = tbl->action;
1282 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1283 int ret = 0;
1284
1285 for (; ;) {
1286 switch (tbl->action) {
1287 case IWL_LEGACY_SWITCH_ANTENNA:
1288 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1289
1290 lq_sta->action_counter++;
1291
1292 /* Don't change antenna if success has been great */
1293 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1294 break;
1295
1296 /* Set up search table to try other antenna */
1297 memcpy(search_tbl, tbl, sz);
1298
1299 if (rs_toggle_antenna(valid_tx_ant,
1300 &search_tbl->current_rate, search_tbl)) {
1301 lq_sta->search_better_tbl = 1;
1302 goto out;
1303 }
1304 break;
1305 case IWL_LEGACY_SWITCH_SISO:
1306 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1307
1308 /* Set up search table to try SISO */
1309 memcpy(search_tbl, tbl, sz);
1310 search_tbl->is_SGI = 0;
1311 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1312 search_tbl, index);
1313 if (!ret) {
1314 lq_sta->search_better_tbl = 1;
1315 lq_sta->action_counter = 0;
1316 goto out;
1317 }
1318
1319 break;
1320 case IWL_LEGACY_SWITCH_MIMO2:
1321 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1322
1323 /* Set up search table to try MIMO */
1324 memcpy(search_tbl, tbl, sz);
1325 search_tbl->is_SGI = 0;
1326 search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1327 /*FIXME:RS:need to check ant validity*/
1328 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1329 search_tbl, index);
1330 if (!ret) {
1331 lq_sta->search_better_tbl = 1;
1332 lq_sta->action_counter = 0;
1333 goto out;
1334 }
1335 break;
1336 }
1337 tbl->action++;
1338 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1339 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1340
1341 if (tbl->action == start_action)
1342 break;
1343
1344 }
1345 return 0;
1346
1347 out:
1348 tbl->action++;
1349 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1350 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1351 return 0;
1352
1353 }
1354
1355 /*
1356 * Try to switch to new modulation mode from SISO
1357 */
1358 static int rs_move_siso_to_other(struct iwl_priv *priv,
1359 struct iwl_lq_sta *lq_sta,
1360 struct ieee80211_conf *conf,
1361 struct sta_info *sta, int index)
1362 {
1363 u8 is_green = lq_sta->is_green;
1364 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1365 struct iwl_scale_tbl_info *search_tbl =
1366 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1367 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1368 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1369 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1370 u8 start_action = tbl->action;
1371 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1372 int ret;
1373
1374 for (;;) {
1375 lq_sta->action_counter++;
1376 switch (tbl->action) {
1377 case IWL_SISO_SWITCH_ANTENNA:
1378 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1379 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1380 break;
1381
1382 memcpy(search_tbl, tbl, sz);
1383 if (rs_toggle_antenna(valid_tx_ant,
1384 &search_tbl->current_rate, search_tbl)) {
1385 lq_sta->search_better_tbl = 1;
1386 goto out;
1387 }
1388 break;
1389 case IWL_SISO_SWITCH_MIMO2:
1390 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1391 memcpy(search_tbl, tbl, sz);
1392 search_tbl->is_SGI = 0;
1393 search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1394 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1395 search_tbl, index);
1396 if (!ret) {
1397 lq_sta->search_better_tbl = 1;
1398 goto out;
1399 }
1400 break;
1401 case IWL_SISO_SWITCH_GI:
1402 if (!tbl->is_fat &&
1403 !(priv->current_ht_config.sgf &
1404 HT_SHORT_GI_20MHZ))
1405 break;
1406 if (tbl->is_fat &&
1407 !(priv->current_ht_config.sgf &
1408 HT_SHORT_GI_40MHZ))
1409 break;
1410
1411 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1412
1413 memcpy(search_tbl, tbl, sz);
1414 if (is_green) {
1415 if (!tbl->is_SGI)
1416 break;
1417 else
1418 IWL_ERROR("SGI was set in GF+SISO\n");
1419 }
1420 search_tbl->is_SGI = !tbl->is_SGI;
1421 rs_set_expected_tpt_table(lq_sta, search_tbl);
1422 if (tbl->is_SGI) {
1423 s32 tpt = lq_sta->last_tpt / 100;
1424 if (tpt >= search_tbl->expected_tpt[index])
1425 break;
1426 }
1427 search_tbl->current_rate = rate_n_flags_from_tbl(
1428 search_tbl, index, is_green);
1429 lq_sta->search_better_tbl = 1;
1430 goto out;
1431 }
1432 tbl->action++;
1433 if (tbl->action > IWL_SISO_SWITCH_GI)
1434 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1435
1436 if (tbl->action == start_action)
1437 break;
1438 }
1439 return 0;
1440
1441 out:
1442 tbl->action++;
1443 if (tbl->action > IWL_SISO_SWITCH_GI)
1444 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1445 return 0;
1446 }
1447
1448 /*
1449 * Try to switch to new modulation mode from MIMO
1450 */
1451 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1452 struct iwl_lq_sta *lq_sta,
1453 struct ieee80211_conf *conf,
1454 struct sta_info *sta, int index)
1455 {
1456 s8 is_green = lq_sta->is_green;
1457 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1458 struct iwl_scale_tbl_info *search_tbl =
1459 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1460 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1461 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1462 u8 start_action = tbl->action;
1463 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1464 int ret;
1465
1466 for (;;) {
1467 lq_sta->action_counter++;
1468 switch (tbl->action) {
1469 case IWL_MIMO_SWITCH_ANTENNA_A:
1470 case IWL_MIMO_SWITCH_ANTENNA_B:
1471 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1472
1473 /* Set up new search table for SISO */
1474 memcpy(search_tbl, tbl, sz);
1475
1476 /*FIXME:RS:need to check ant validity + C*/
1477 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1478 search_tbl->ant_type = ANT_A;
1479 else
1480 search_tbl->ant_type = ANT_B;
1481
1482 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1483 search_tbl, index);
1484 if (!ret) {
1485 lq_sta->search_better_tbl = 1;
1486 goto out;
1487 }
1488 break;
1489
1490 case IWL_MIMO_SWITCH_GI:
1491 if (!tbl->is_fat &&
1492 !(priv->current_ht_config.sgf &
1493 HT_SHORT_GI_20MHZ))
1494 break;
1495 if (tbl->is_fat &&
1496 !(priv->current_ht_config.sgf &
1497 HT_SHORT_GI_40MHZ))
1498 break;
1499
1500 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1501
1502 /* Set up new search table for MIMO */
1503 memcpy(search_tbl, tbl, sz);
1504 search_tbl->is_SGI = !tbl->is_SGI;
1505 rs_set_expected_tpt_table(lq_sta, search_tbl);
1506 /*
1507 * If active table already uses the fastest possible
1508 * modulation (dual stream with short guard interval),
1509 * and it's working well, there's no need to look
1510 * for a better type of modulation!
1511 */
1512 if (tbl->is_SGI) {
1513 s32 tpt = lq_sta->last_tpt / 100;
1514 if (tpt >= search_tbl->expected_tpt[index])
1515 break;
1516 }
1517 search_tbl->current_rate = rate_n_flags_from_tbl(
1518 search_tbl, index, is_green);
1519 lq_sta->search_better_tbl = 1;
1520 goto out;
1521
1522 }
1523 tbl->action++;
1524 if (tbl->action > IWL_MIMO_SWITCH_GI)
1525 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1526
1527 if (tbl->action == start_action)
1528 break;
1529 }
1530
1531 return 0;
1532 out:
1533 tbl->action++;
1534 if (tbl->action > IWL_MIMO_SWITCH_GI)
1535 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1536 return 0;
1537
1538 }
1539
1540 /*
1541 * Check whether we should continue using same modulation mode, or
1542 * begin search for a new mode, based on:
1543 * 1) # tx successes or failures while using this mode
1544 * 2) # times calling this function
1545 * 3) elapsed time in this mode (not used, for now)
1546 */
1547 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1548 {
1549 struct iwl_scale_tbl_info *tbl;
1550 int i;
1551 int active_tbl;
1552 int flush_interval_passed = 0;
1553 struct iwl_priv *priv;
1554
1555 priv = lq_sta->drv;
1556 active_tbl = lq_sta->active_tbl;
1557
1558 tbl = &(lq_sta->lq_info[active_tbl]);
1559
1560 /* If we've been disallowing search, see if we should now allow it */
1561 if (lq_sta->stay_in_tbl) {
1562
1563 /* Elapsed time using current modulation mode */
1564 if (lq_sta->flush_timer)
1565 flush_interval_passed =
1566 time_after(jiffies,
1567 (unsigned long)(lq_sta->flush_timer +
1568 IWL_RATE_SCALE_FLUSH_INTVL));
1569
1570 /*
1571 * Check if we should allow search for new modulation mode.
1572 * If many frames have failed or succeeded, or we've used
1573 * this same modulation for a long time, allow search, and
1574 * reset history stats that keep track of whether we should
1575 * allow a new search. Also (below) reset all bitmaps and
1576 * stats in active history.
1577 */
1578 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1579 (lq_sta->total_success > lq_sta->max_success_limit) ||
1580 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1581 && (flush_interval_passed))) {
1582 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1583 lq_sta->total_failed,
1584 lq_sta->total_success,
1585 flush_interval_passed);
1586
1587 /* Allow search for new mode */
1588 lq_sta->stay_in_tbl = 0; /* only place reset */
1589 lq_sta->total_failed = 0;
1590 lq_sta->total_success = 0;
1591 lq_sta->flush_timer = 0;
1592
1593 /*
1594 * Else if we've used this modulation mode enough repetitions
1595 * (regardless of elapsed time or success/failure), reset
1596 * history bitmaps and rate-specific stats for all rates in
1597 * active table.
1598 */
1599 } else {
1600 lq_sta->table_count++;
1601 if (lq_sta->table_count >=
1602 lq_sta->table_count_limit) {
1603 lq_sta->table_count = 0;
1604
1605 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1606 for (i = 0; i < IWL_RATE_COUNT; i++)
1607 rs_rate_scale_clear_window(
1608 &(tbl->win[i]));
1609 }
1610 }
1611
1612 /* If transitioning to allow "search", reset all history
1613 * bitmaps and stats in active table (this will become the new
1614 * "search" table). */
1615 if (!lq_sta->stay_in_tbl) {
1616 for (i = 0; i < IWL_RATE_COUNT; i++)
1617 rs_rate_scale_clear_window(&(tbl->win[i]));
1618 }
1619 }
1620 }
1621
1622 /*
1623 * Do rate scaling and search for new modulation mode.
1624 */
1625 static void rs_rate_scale_perform(struct iwl_priv *priv,
1626 struct net_device *dev,
1627 struct ieee80211_hdr *hdr,
1628 struct sta_info *sta)
1629 {
1630 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1631 struct ieee80211_hw *hw = local_to_hw(local);
1632 struct ieee80211_conf *conf = &hw->conf;
1633 int low = IWL_RATE_INVALID;
1634 int high = IWL_RATE_INVALID;
1635 int index;
1636 int i;
1637 struct iwl_rate_scale_data *window = NULL;
1638 int current_tpt = IWL_INVALID_VALUE;
1639 int low_tpt = IWL_INVALID_VALUE;
1640 int high_tpt = IWL_INVALID_VALUE;
1641 u32 fail_count;
1642 s8 scale_action = 0;
1643 __le16 fc;
1644 u16 rate_mask;
1645 u8 update_lq = 0;
1646 struct iwl_lq_sta *lq_sta;
1647 struct iwl_scale_tbl_info *tbl, *tbl1;
1648 u16 rate_scale_index_msk = 0;
1649 u32 rate;
1650 u8 is_green = 0;
1651 u8 active_tbl = 0;
1652 u8 done_search = 0;
1653 u16 high_low;
1654 s32 sr;
1655 u8 tid = MAX_TID_COUNT;
1656
1657 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1658
1659 fc = hdr->frame_control;
1660 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1661 /* Send management frames and broadcast/multicast data using
1662 * lowest rate. */
1663 /* TODO: this could probably be improved.. */
1664 return;
1665 }
1666
1667 if (!sta || !sta->rate_ctrl_priv)
1668 return;
1669
1670 lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
1671
1672 tid = rs_tl_add_packet(lq_sta, hdr);
1673
1674 /*
1675 * Select rate-scale / modulation-mode table to work with in
1676 * the rest of this function: "search" if searching for better
1677 * modulation mode, or "active" if doing rate scaling within a mode.
1678 */
1679 if (!lq_sta->search_better_tbl)
1680 active_tbl = lq_sta->active_tbl;
1681 else
1682 active_tbl = 1 - lq_sta->active_tbl;
1683
1684 tbl = &(lq_sta->lq_info[active_tbl]);
1685 is_green = lq_sta->is_green;
1686
1687 /* current tx rate */
1688 index = sta->last_txrate_idx;
1689
1690 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1691 tbl->lq_type);
1692
1693 /* rates available for this association, and for modulation mode */
1694 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1695
1696 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1697
1698 /* mask with station rate restriction */
1699 if (is_legacy(tbl->lq_type)) {
1700 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1701 /* supp_rates has no CCK bits in A mode */
1702 rate_scale_index_msk = (u16) (rate_mask &
1703 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1704 else
1705 rate_scale_index_msk = (u16) (rate_mask &
1706 lq_sta->supp_rates);
1707
1708 } else
1709 rate_scale_index_msk = rate_mask;
1710
1711 if (!rate_scale_index_msk)
1712 rate_scale_index_msk = rate_mask;
1713
1714 if (!((1 << index) & rate_scale_index_msk)) {
1715 IWL_ERROR("Current Rate is not valid\n");
1716 return;
1717 }
1718
1719 /* Get expected throughput table and history window for current rate */
1720 if (!tbl->expected_tpt) {
1721 IWL_ERROR("tbl->expected_tpt is NULL\n");
1722 return;
1723 }
1724
1725 window = &(tbl->win[index]);
1726
1727 /*
1728 * If there is not enough history to calculate actual average
1729 * throughput, keep analyzing results of more tx frames, without
1730 * changing rate or mode (bypass most of the rest of this function).
1731 * Set up new rate table in uCode only if old rate is not supported
1732 * in current association (use new rate found above).
1733 */
1734 fail_count = window->counter - window->success_counter;
1735 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1736 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1737 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1738 "for index %d\n",
1739 window->success_counter, window->counter, index);
1740
1741 /* Can't calculate this yet; not enough history */
1742 window->average_tpt = IWL_INVALID_VALUE;
1743
1744 /* Should we stay with this modulation mode,
1745 * or search for a new one? */
1746 rs_stay_in_table(lq_sta);
1747
1748 goto out;
1749
1750 /* Else we have enough samples; calculate estimate of
1751 * actual average throughput */
1752 } else {
1753 /*FIXME:RS remove this else if we don't get this error*/
1754 if (window->average_tpt != ((window->success_ratio *
1755 tbl->expected_tpt[index] + 64) / 128)) {
1756 IWL_ERROR("expected_tpt should have been calculated"
1757 " by now\n");
1758 window->average_tpt = ((window->success_ratio *
1759 tbl->expected_tpt[index] + 64) / 128);
1760 }
1761 }
1762
1763 /* If we are searching for better modulation mode, check success. */
1764 if (lq_sta->search_better_tbl) {
1765
1766 /* If good success, continue using the "search" mode;
1767 * no need to send new link quality command, since we're
1768 * continuing to use the setup that we've been trying. */
1769 if (window->average_tpt > lq_sta->last_tpt) {
1770
1771 IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1772 "suc=%d cur-tpt=%d old-tpt=%d\n",
1773 window->success_ratio,
1774 window->average_tpt,
1775 lq_sta->last_tpt);
1776
1777 if (!is_legacy(tbl->lq_type))
1778 lq_sta->enable_counter = 1;
1779
1780 /* Swap tables; "search" becomes "active" */
1781 lq_sta->active_tbl = active_tbl;
1782 current_tpt = window->average_tpt;
1783
1784 /* Else poor success; go back to mode in "active" table */
1785 } else {
1786
1787 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1788 "suc=%d cur-tpt=%d old-tpt=%d\n",
1789 window->success_ratio,
1790 window->average_tpt,
1791 lq_sta->last_tpt);
1792
1793 /* Nullify "search" table */
1794 tbl->lq_type = LQ_NONE;
1795
1796 /* Revert to "active" table */
1797 active_tbl = lq_sta->active_tbl;
1798 tbl = &(lq_sta->lq_info[active_tbl]);
1799
1800 /* Revert to "active" rate and throughput info */
1801 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1802 current_tpt = lq_sta->last_tpt;
1803
1804 /* Need to set up a new rate table in uCode */
1805 update_lq = 1;
1806 }
1807
1808 /* Either way, we've made a decision; modulation mode
1809 * search is done, allow rate adjustment next time. */
1810 lq_sta->search_better_tbl = 0;
1811 done_search = 1; /* Don't switch modes below! */
1812 goto lq_update;
1813 }
1814
1815 /* (Else) not in search of better modulation mode, try for better
1816 * starting rate, while staying in this mode. */
1817 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1818 tbl->lq_type);
1819 low = high_low & 0xff;
1820 high = (high_low >> 8) & 0xff;
1821
1822 sr = window->success_ratio;
1823
1824 /* Collect measured throughputs for current and adjacent rates */
1825 current_tpt = window->average_tpt;
1826 if (low != IWL_RATE_INVALID)
1827 low_tpt = tbl->win[low].average_tpt;
1828 if (high != IWL_RATE_INVALID)
1829 high_tpt = tbl->win[high].average_tpt;
1830
1831 scale_action = 0;
1832
1833 /* Too many failures, decrease rate */
1834 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1835 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1836 scale_action = -1;
1837
1838 /* No throughput measured yet for adjacent rates; try increase. */
1839 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1840 (high_tpt == IWL_INVALID_VALUE)) {
1841
1842 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1843 scale_action = 1;
1844 else if (low != IWL_RATE_INVALID)
1845 scale_action = -1;
1846 }
1847
1848 /* Both adjacent throughputs are measured, but neither one has better
1849 * throughput; we're using the best rate, don't change it! */
1850 else if ((low_tpt != IWL_INVALID_VALUE) &&
1851 (high_tpt != IWL_INVALID_VALUE) &&
1852 (low_tpt < current_tpt) &&
1853 (high_tpt < current_tpt))
1854 scale_action = 0;
1855
1856 /* At least one adjacent rate's throughput is measured,
1857 * and may have better performance. */
1858 else {
1859 /* Higher adjacent rate's throughput is measured */
1860 if (high_tpt != IWL_INVALID_VALUE) {
1861 /* Higher rate has better throughput */
1862 if (high_tpt > current_tpt &&
1863 sr >= IWL_RATE_INCREASE_TH) {
1864 scale_action = 1;
1865 } else {
1866 IWL_DEBUG_RATE
1867 ("decrease rate because of high tpt\n");
1868 scale_action = -1;
1869 }
1870
1871 /* Lower adjacent rate's throughput is measured */
1872 } else if (low_tpt != IWL_INVALID_VALUE) {
1873 /* Lower rate has better throughput */
1874 if (low_tpt > current_tpt) {
1875 IWL_DEBUG_RATE
1876 ("decrease rate because of low tpt\n");
1877 scale_action = -1;
1878 } else if (sr >= IWL_RATE_INCREASE_TH) {
1879 scale_action = 1;
1880 }
1881 }
1882 }
1883
1884 /* Sanity check; asked for decrease, but success rate or throughput
1885 * has been good at old rate. Don't change it. */
1886 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1887 ((sr > IWL_RATE_HIGH_TH) ||
1888 (current_tpt > (100 * tbl->expected_tpt[low]))))
1889 scale_action = 0;
1890
1891 switch (scale_action) {
1892 case -1:
1893 /* Decrease starting rate, update uCode's rate table */
1894 if (low != IWL_RATE_INVALID) {
1895 update_lq = 1;
1896 index = low;
1897 }
1898 break;
1899 case 1:
1900 /* Increase starting rate, update uCode's rate table */
1901 if (high != IWL_RATE_INVALID) {
1902 update_lq = 1;
1903 index = high;
1904 }
1905
1906 break;
1907 case 0:
1908 /* No change */
1909 default:
1910 break;
1911 }
1912
1913 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1914 "high %d type %d\n",
1915 index, scale_action, low, high, tbl->lq_type);
1916
1917 lq_update:
1918 /* Replace uCode's rate table for the destination station. */
1919 if (update_lq) {
1920 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1921 rs_fill_link_cmd(priv, lq_sta, rate);
1922 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1923 }
1924
1925 /* Should we stay with this modulation mode, or search for a new one? */
1926 rs_stay_in_table(lq_sta);
1927
1928 /*
1929 * Search for new modulation mode if we're:
1930 * 1) Not changing rates right now
1931 * 2) Not just finishing up a search
1932 * 3) Allowing a new search
1933 */
1934 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1935 /* Save current throughput to compare with "search" throughput*/
1936 lq_sta->last_tpt = current_tpt;
1937
1938 /* Select a new "search" modulation mode to try.
1939 * If one is found, set up the new "search" table. */
1940 if (is_legacy(tbl->lq_type))
1941 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1942 else if (is_siso(tbl->lq_type))
1943 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1944 else
1945 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1946
1947 /* If new "search" mode was selected, set up in uCode table */
1948 if (lq_sta->search_better_tbl) {
1949 /* Access the "search" table, clear its history. */
1950 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1951 for (i = 0; i < IWL_RATE_COUNT; i++)
1952 rs_rate_scale_clear_window(&(tbl->win[i]));
1953
1954 /* Use new "search" start rate */
1955 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1956
1957 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1958 tbl->current_rate, index);
1959 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1960 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1961 }
1962
1963 /* If the "active" (non-search) mode was legacy,
1964 * and we've tried switching antennas,
1965 * but we haven't been able to try HT modes (not available),
1966 * stay with best antenna legacy modulation for a while
1967 * before next round of mode comparisons. */
1968 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1969 if (is_legacy(tbl1->lq_type) &&
1970 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1971 (lq_sta->action_counter >= 1)) {
1972 lq_sta->action_counter = 0;
1973 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1974 rs_set_stay_in_table(priv, 1, lq_sta);
1975 }
1976
1977 /* If we're in an HT mode, and all 3 mode switch actions
1978 * have been tried and compared, stay in this best modulation
1979 * mode for a while before next round of mode comparisons. */
1980 if (lq_sta->enable_counter &&
1981 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1982 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
1983 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
1984 (tid != MAX_TID_COUNT)) {
1985 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
1986 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
1987 }
1988 lq_sta->action_counter = 0;
1989 rs_set_stay_in_table(priv, 0, lq_sta);
1990 }
1991
1992 /*
1993 * Else, don't search for a new modulation mode.
1994 * Put new timestamp in stay-in-modulation-mode flush timer if:
1995 * 1) Not changing rates right now
1996 * 2) Not just finishing up a search
1997 * 3) flush timer is empty
1998 */
1999 } else {
2000 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2001 lq_sta->flush_timer = jiffies;
2002 }
2003
2004 out:
2005 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2006 i = index;
2007 sta->last_txrate_idx = i;
2008
2009 /* sta->txrate_idx is an index to A mode rates which start
2010 * at IWL_FIRST_OFDM_RATE
2011 */
2012 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2013 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2014 else
2015 sta->txrate_idx = i;
2016
2017 return;
2018 }
2019
2020
2021 static void rs_initialize_lq(struct iwl_priv *priv,
2022 struct ieee80211_conf *conf,
2023 struct sta_info *sta)
2024 {
2025 struct iwl_lq_sta *lq_sta;
2026 struct iwl_scale_tbl_info *tbl;
2027 int rate_idx;
2028 int i;
2029 u32 rate;
2030 u8 use_green = rs_use_green(priv, conf);
2031 u8 active_tbl = 0;
2032 u8 valid_tx_ant;
2033
2034 if (!sta || !sta->rate_ctrl_priv)
2035 goto out;
2036
2037 lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
2038 i = sta->last_txrate_idx;
2039
2040 if ((lq_sta->lq.sta_id == 0xff) &&
2041 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2042 goto out;
2043
2044 valid_tx_ant = priv->hw_params.valid_tx_ant;
2045
2046 if (!lq_sta->search_better_tbl)
2047 active_tbl = lq_sta->active_tbl;
2048 else
2049 active_tbl = 1 - lq_sta->active_tbl;
2050
2051 tbl = &(lq_sta->lq_info[active_tbl]);
2052
2053 if ((i < 0) || (i >= IWL_RATE_COUNT))
2054 i = 0;
2055
2056 /* FIXME:RS: This is also wrong in 4965 */
2057 rate = iwl_rates[i].plcp;
2058 rate |= RATE_MCS_ANT_B_MSK;
2059 rate &= ~RATE_MCS_ANT_A_MSK;
2060
2061 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2062 rate |= RATE_MCS_CCK_MSK;
2063
2064 tbl->ant_type = ANT_B;
2065 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2066 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2067 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2068
2069 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2070 tbl->current_rate = rate;
2071 rs_set_expected_tpt_table(lq_sta, tbl);
2072 rs_fill_link_cmd(NULL, lq_sta, rate);
2073 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2074 out:
2075 return;
2076 }
2077
2078 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2079 struct ieee80211_supported_band *sband,
2080 struct sk_buff *skb,
2081 struct rate_selection *sel)
2082 {
2083
2084 int i;
2085 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2086 struct ieee80211_conf *conf = &local->hw.conf;
2087 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2088 struct sta_info *sta;
2089 __le16 fc;
2090 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2091 struct iwl_lq_sta *lq_sta;
2092
2093 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2094
2095 rcu_read_lock();
2096
2097 sta = sta_info_get(local, hdr->addr1);
2098
2099 /* Send management frames and broadcast/multicast data using lowest
2100 * rate. */
2101 fc = hdr->frame_control;
2102 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2103 !sta || !sta->rate_ctrl_priv) {
2104 sel->rate_idx = rate_lowest_index(local, sband, sta);
2105 goto out;
2106 }
2107
2108 lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
2109 i = sta->last_txrate_idx;
2110
2111 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2112 !lq_sta->ibss_sta_added) {
2113 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2114 DECLARE_MAC_BUF(mac);
2115
2116 if (sta_id == IWL_INVALID_STATION) {
2117 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2118 print_mac(mac, hdr->addr1));
2119 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2120 0, CMD_ASYNC, NULL);
2121 }
2122 if ((sta_id != IWL_INVALID_STATION)) {
2123 lq_sta->lq.sta_id = sta_id;
2124 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2125 lq_sta->ibss_sta_added = 1;
2126 rs_initialize_lq(priv, conf, sta);
2127 }
2128 }
2129
2130 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2131 sel->rate_idx = rate_lowest_index(local, sband, sta);
2132 goto out;
2133 }
2134
2135 if (sband->band == IEEE80211_BAND_5GHZ)
2136 i -= IWL_FIRST_OFDM_RATE;
2137 sel->rate_idx = i;
2138 out:
2139 rcu_read_unlock();
2140 }
2141
2142 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2143 {
2144 struct iwl_lq_sta *lq_sta;
2145 struct iwl_priv *priv;
2146 int i, j;
2147
2148 priv = (struct iwl_priv *)priv_rate;
2149 IWL_DEBUG_RATE("create station rate scale window\n");
2150
2151 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2152
2153 if (lq_sta == NULL)
2154 return NULL;
2155 lq_sta->lq.sta_id = 0xff;
2156
2157
2158 for (j = 0; j < LQ_SIZE; j++)
2159 for (i = 0; i < IWL_RATE_COUNT; i++)
2160 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2161
2162 return lq_sta;
2163 }
2164
2165 static void rs_rate_init(void *priv_rate, void *priv_sta,
2166 struct ieee80211_local *local,
2167 struct sta_info *sta)
2168 {
2169 int i, j;
2170 struct ieee80211_conf *conf = &local->hw.conf;
2171 struct ieee80211_supported_band *sband;
2172 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2173 struct iwl_lq_sta *lq_sta = priv_sta;
2174
2175 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2176
2177 lq_sta->flush_timer = 0;
2178 lq_sta->supp_rates = sta->supp_rates[sband->band];
2179 sta->txrate_idx = 3;
2180 for (j = 0; j < LQ_SIZE; j++)
2181 for (i = 0; i < IWL_RATE_COUNT; i++)
2182 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2183
2184 IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2185 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2186 * the lowest or the highest rate.. Could consider using RSSI from
2187 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2188 * after assoc.. */
2189
2190 lq_sta->ibss_sta_added = 0;
2191 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2192 u8 sta_id = iwl_find_station(priv, sta->addr);
2193 DECLARE_MAC_BUF(mac);
2194
2195 /* for IBSS the call are from tasklet */
2196 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2197 print_mac(mac, sta->addr));
2198
2199 if (sta_id == IWL_INVALID_STATION) {
2200 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2201 print_mac(mac, sta->addr));
2202 sta_id = iwl_add_station_flags(priv, sta->addr,
2203 0, CMD_ASYNC, NULL);
2204 }
2205 if ((sta_id != IWL_INVALID_STATION)) {
2206 lq_sta->lq.sta_id = sta_id;
2207 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2208 }
2209 /* FIXME: this is w/a remove it later */
2210 priv->assoc_station_added = 1;
2211 }
2212
2213 /* Find highest tx rate supported by hardware and destination station */
2214 for (i = 0; i < sband->n_bitrates; i++)
2215 if (sta->supp_rates[sband->band] & BIT(i))
2216 sta->txrate_idx = i;
2217
2218 sta->last_txrate_idx = sta->txrate_idx;
2219 /* WTF is with this bogus comment? A doesn't have cck rates */
2220 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2221 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2222 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2223
2224 lq_sta->is_dup = 0;
2225 lq_sta->is_green = rs_use_green(priv, conf);
2226 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2227 lq_sta->active_rate_basic = priv->active_rate_basic;
2228 lq_sta->band = priv->band;
2229 /*
2230 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2231 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2232 */
2233 lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2234 lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2235 lq_sta->active_siso_rate &= ~((u16)0x2);
2236 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2237
2238 /* Same here */
2239 lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2240 lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2241 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2242 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2243
2244 lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2245 lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2246 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2247 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2248
2249 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2250 lq_sta->active_siso_rate,
2251 lq_sta->active_mimo2_rate,
2252 lq_sta->active_mimo3_rate);
2253
2254 /* These values will be overriden later */
2255 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2256 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2257
2258 /* as default allow aggregation for all tids */
2259 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2260 lq_sta->drv = priv;
2261
2262 rs_initialize_lq(priv, conf, sta);
2263 }
2264
2265 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2266 struct iwl_lq_sta *lq_sta, u32 new_rate)
2267 {
2268 struct iwl_scale_tbl_info tbl_type;
2269 int index = 0;
2270 int rate_idx;
2271 int repeat_rate = 0;
2272 u8 ant_toggle_cnt = 0;
2273 u8 use_ht_possible = 1;
2274 u8 valid_tx_ant = 0;
2275 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2276
2277 /* Override starting rate (index 0) if needed for debug purposes */
2278 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2279
2280 /* Interpret new_rate (rate_n_flags) */
2281 memset(&tbl_type, 0, sizeof(tbl_type));
2282 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2283 &tbl_type, &rate_idx);
2284
2285 /* How many times should we repeat the initial rate? */
2286 if (is_legacy(tbl_type.lq_type)) {
2287 ant_toggle_cnt = 1;
2288 repeat_rate = IWL_NUMBER_TRY;
2289 } else {
2290 repeat_rate = IWL_HT_NUMBER_TRY;
2291 }
2292
2293 lq_cmd->general_params.mimo_delimiter =
2294 is_mimo(tbl_type.lq_type) ? 1 : 0;
2295
2296 /* Fill 1st table entry (index 0) */
2297 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2298
2299 if (num_of_ant(tbl_type.ant_type) == 1) {
2300 lq_cmd->general_params.single_stream_ant_msk =
2301 tbl_type.ant_type;
2302 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2303 lq_cmd->general_params.dual_stream_ant_msk =
2304 tbl_type.ant_type;
2305 } /* otherwise we don't modify the existing value */
2306
2307 index++;
2308 repeat_rate--;
2309
2310 if (priv)
2311 valid_tx_ant = priv->hw_params.valid_tx_ant;
2312
2313 /* Fill rest of rate table */
2314 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2315 /* Repeat initial/next rate.
2316 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2317 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2318 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2319 if (is_legacy(tbl_type.lq_type)) {
2320 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2321 ant_toggle_cnt++;
2322 else if (priv &&
2323 rs_toggle_antenna(valid_tx_ant,
2324 &new_rate, &tbl_type))
2325 ant_toggle_cnt = 1;
2326 }
2327
2328 /* Override next rate if needed for debug purposes */
2329 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2330
2331 /* Fill next table entry */
2332 lq_cmd->rs_table[index].rate_n_flags =
2333 cpu_to_le32(new_rate);
2334 repeat_rate--;
2335 index++;
2336 }
2337
2338 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2339 &rate_idx);
2340
2341 /* Indicate to uCode which entries might be MIMO.
2342 * If initial rate was MIMO, this will finally end up
2343 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2344 if (is_mimo(tbl_type.lq_type))
2345 lq_cmd->general_params.mimo_delimiter = index;
2346
2347 /* Get next rate */
2348 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2349 use_ht_possible);
2350
2351 /* How many times should we repeat the next rate? */
2352 if (is_legacy(tbl_type.lq_type)) {
2353 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2354 ant_toggle_cnt++;
2355 else if (priv &&
2356 rs_toggle_antenna(valid_tx_ant,
2357 &new_rate, &tbl_type))
2358 ant_toggle_cnt = 1;
2359
2360 repeat_rate = IWL_NUMBER_TRY;
2361 } else {
2362 repeat_rate = IWL_HT_NUMBER_TRY;
2363 }
2364
2365 /* Don't allow HT rates after next pass.
2366 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2367 use_ht_possible = 0;
2368
2369 /* Override next rate if needed for debug purposes */
2370 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2371
2372 /* Fill next table entry */
2373 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2374
2375 index++;
2376 repeat_rate--;
2377 }
2378
2379 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2380 lq_cmd->agg_params.agg_dis_start_th = 3;
2381 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2382 }
2383
2384 static void *rs_alloc(struct ieee80211_local *local)
2385 {
2386 return local->hw.priv;
2387 }
2388 /* rate scale requires free function to be implemented */
2389 static void rs_free(void *priv_rate)
2390 {
2391 return;
2392 }
2393
2394 static void rs_clear(void *priv_rate)
2395 {
2396 #ifdef CONFIG_IWLWIFI_DEBUG
2397 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2398
2399 IWL_DEBUG_RATE("enter\n");
2400
2401 /* TODO - add rate scale state reset */
2402
2403 IWL_DEBUG_RATE("leave\n");
2404 #endif /* CONFIG_IWLWIFI_DEBUG */
2405 }
2406
2407 static void rs_free_sta(void *priv_rate, void *priv_sta)
2408 {
2409 struct iwl_lq_sta *lq_sta = priv_sta;
2410 struct iwl_priv *priv;
2411
2412 priv = (struct iwl_priv *)priv_rate;
2413 IWL_DEBUG_RATE("enter\n");
2414 kfree(lq_sta);
2415 IWL_DEBUG_RATE("leave\n");
2416 }
2417
2418
2419 #ifdef CONFIG_MAC80211_DEBUGFS
2420 static int open_file_generic(struct inode *inode, struct file *file)
2421 {
2422 file->private_data = inode->i_private;
2423 return 0;
2424 }
2425 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2426 u32 *rate_n_flags, int index)
2427 {
2428 struct iwl_priv *priv;
2429
2430 priv = lq_sta->drv;
2431 if (lq_sta->dbg_fixed_rate) {
2432 if (index < 12) {
2433 *rate_n_flags = lq_sta->dbg_fixed_rate;
2434 } else {
2435 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2436 *rate_n_flags = 0x800D;
2437 else
2438 *rate_n_flags = 0x820A;
2439 }
2440 IWL_DEBUG_RATE("Fixed rate ON\n");
2441 } else {
2442 IWL_DEBUG_RATE("Fixed rate OFF\n");
2443 }
2444 }
2445
2446 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2447 const char __user *user_buf, size_t count, loff_t *ppos)
2448 {
2449 struct iwl_lq_sta *lq_sta = file->private_data;
2450 struct iwl_priv *priv;
2451 char buf[64];
2452 int buf_size;
2453 u32 parsed_rate;
2454
2455 priv = lq_sta->drv;
2456 memset(buf, 0, sizeof(buf));
2457 buf_size = min(count, sizeof(buf) - 1);
2458 if (copy_from_user(buf, user_buf, buf_size))
2459 return -EFAULT;
2460
2461 if (sscanf(buf, "%x", &parsed_rate) == 1)
2462 lq_sta->dbg_fixed_rate = parsed_rate;
2463 else
2464 lq_sta->dbg_fixed_rate = 0;
2465
2466 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2467 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2468 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2469 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2470
2471 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2472 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2473
2474 if (lq_sta->dbg_fixed_rate) {
2475 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2476 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2477 }
2478
2479 return count;
2480 }
2481
2482 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2483 char __user *user_buf, size_t count, loff_t *ppos)
2484 {
2485 char buff[1024];
2486 int desc = 0;
2487 int i = 0;
2488
2489 struct iwl_lq_sta *lq_sta = file->private_data;
2490
2491 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2492 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2493 lq_sta->total_failed, lq_sta->total_success,
2494 lq_sta->active_legacy_rate);
2495 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2496 lq_sta->dbg_fixed_rate);
2497 desc += sprintf(buff+desc, "general:"
2498 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2499 lq_sta->lq.general_params.flags,
2500 lq_sta->lq.general_params.mimo_delimiter,
2501 lq_sta->lq.general_params.single_stream_ant_msk,
2502 lq_sta->lq.general_params.dual_stream_ant_msk);
2503
2504 desc += sprintf(buff+desc, "agg:"
2505 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2506 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2507 lq_sta->lq.agg_params.agg_dis_start_th,
2508 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2509
2510 desc += sprintf(buff+desc,
2511 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2512 lq_sta->lq.general_params.start_rate_index[0],
2513 lq_sta->lq.general_params.start_rate_index[1],
2514 lq_sta->lq.general_params.start_rate_index[2],
2515 lq_sta->lq.general_params.start_rate_index[3]);
2516
2517
2518 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2519 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2520 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2521
2522 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2523 }
2524
2525 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2526 .write = rs_sta_dbgfs_scale_table_write,
2527 .read = rs_sta_dbgfs_scale_table_read,
2528 .open = open_file_generic,
2529 };
2530 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2531 char __user *user_buf, size_t count, loff_t *ppos)
2532 {
2533 char buff[1024];
2534 int desc = 0;
2535 int i, j;
2536
2537 struct iwl_lq_sta *lq_sta = file->private_data;
2538 for (i = 0; i < LQ_SIZE; i++) {
2539 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2540 "rate=0x%X\n",
2541 lq_sta->active_tbl == i?"*":"x",
2542 lq_sta->lq_info[i].lq_type,
2543 lq_sta->lq_info[i].is_SGI,
2544 lq_sta->lq_info[i].is_fat,
2545 lq_sta->lq_info[i].is_dup,
2546 lq_sta->lq_info[i].current_rate);
2547 for (j = 0; j < IWL_RATE_COUNT; j++) {
2548 desc += sprintf(buff+desc,
2549 "counter=%d success=%d %%=%d\n",
2550 lq_sta->lq_info[i].win[j].counter,
2551 lq_sta->lq_info[i].win[j].success_counter,
2552 lq_sta->lq_info[i].win[j].success_ratio);
2553 }
2554 }
2555 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2556 }
2557
2558 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2559 .read = rs_sta_dbgfs_stats_table_read,
2560 .open = open_file_generic,
2561 };
2562
2563 static void rs_add_debugfs(void *priv, void *priv_sta,
2564 struct dentry *dir)
2565 {
2566 struct iwl_lq_sta *lq_sta = priv_sta;
2567 lq_sta->rs_sta_dbgfs_scale_table_file =
2568 debugfs_create_file("rate_scale_table", 0600, dir,
2569 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2570 lq_sta->rs_sta_dbgfs_stats_table_file =
2571 debugfs_create_file("rate_stats_table", 0600, dir,
2572 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2573 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2574 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2575 &lq_sta->tx_agg_tid_en);
2576
2577 }
2578
2579 static void rs_remove_debugfs(void *priv, void *priv_sta)
2580 {
2581 struct iwl_lq_sta *lq_sta = priv_sta;
2582 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2583 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2584 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2585 }
2586 #endif
2587
2588 static struct rate_control_ops rs_ops = {
2589 .module = NULL,
2590 .name = RS_NAME,
2591 .tx_status = rs_tx_status,
2592 .get_rate = rs_get_rate,
2593 .rate_init = rs_rate_init,
2594 .clear = rs_clear,
2595 .alloc = rs_alloc,
2596 .free = rs_free,
2597 .alloc_sta = rs_alloc_sta,
2598 .free_sta = rs_free_sta,
2599 #ifdef CONFIG_MAC80211_DEBUGFS
2600 .add_sta_debugfs = rs_add_debugfs,
2601 .remove_sta_debugfs = rs_remove_debugfs,
2602 #endif
2603 };
2604
2605 int iwlagn_rate_control_register(void)
2606 {
2607 return ieee80211_rate_control_register(&rs_ops);
2608 }
2609
2610 void iwlagn_rate_control_unregister(void)
2611 {
2612 ieee80211_rate_control_unregister(&rs_ops);
2613 }
2614
Linux kernel - Deliverables
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