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debugfs: Modified default dir of debugfs for debugging UHCI.
[linux/fpc-iii.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob40b207aa8fef44dae59c2a6e4117f5af978ba61a
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "iwl-dev.h"
39 #include "iwl-sta.h"
40 #include "iwl-core.h"
41
42 #define RS_NAME "iwl-agn-rs"
43
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
47
48 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
51
52 /* max allowed rate miss before sync LQ cmd */
53 #define IWL_MISSED_RATE_MAX 15
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
56
57 static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65 };
66
67 static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
69 /*ANT_A -> */ ANT_B,
70 /*ANT_B -> */ ANT_C,
71 /*ANT_AB -> */ ANT_BC,
72 /*ANT_C -> */ ANT_A,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
76 };
77
78 /**
79 * struct iwl_rate_scale_data -- tx success history for one rate
80 */
81 struct iwl_rate_scale_data {
82 u64 data; /* bitmap of successful frames */
83 s32 success_counter; /* number of frames successful */
84 s32 success_ratio; /* per-cent * 128 */
85 s32 counter; /* number of frames attempted */
86 s32 average_tpt; /* success ratio * expected throughput */
87 unsigned long stamp;
88 };
89
90 /**
91 * struct iwl_scale_tbl_info -- tx params and success history for all rates
92 *
93 * There are two of these in struct iwl_lq_sta,
94 * one for "active", and one for "search".
95 */
96 struct iwl_scale_tbl_info {
97 enum iwl_table_type lq_type;
98 u8 ant_type;
99 u8 is_SGI; /* 1 = short guard interval */
100 u8 is_ht40; /* 1 = 40 MHz channel width */
101 u8 is_dup; /* 1 = duplicated data streams */
102 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
103 u8 max_search; /* maximun number of tables we can search */
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 u64 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 s8 max_rate_idx; /* Max rate set by user */
155 u8 missed_rate_counter;
156
157 struct iwl_link_quality_cmd lq;
158 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
159 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
160 u8 tx_agg_tid_en;
161 #ifdef CONFIG_MAC80211_DEBUGFS
162 struct dentry *rs_sta_dbgfs_scale_table_file;
163 struct dentry *rs_sta_dbgfs_stats_table_file;
164 struct dentry *rs_sta_dbgfs_rate_scale_data_file;
165 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
166 u32 dbg_fixed_rate;
167 #endif
168 struct iwl_priv *drv;
169
170 /* used to be in sta_info */
171 int last_txrate_idx;
172 /* last tx rate_n_flags */
173 u32 last_rate_n_flags;
174 };
175
176 static void rs_rate_scale_perform(struct iwl_priv *priv,
177 struct sk_buff *skb,
178 struct ieee80211_sta *sta,
179 struct iwl_lq_sta *lq_sta);
180 static void rs_fill_link_cmd(struct iwl_priv *priv,
181 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
182
183
184 #ifdef CONFIG_MAC80211_DEBUGFS
185 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
186 u32 *rate_n_flags, int index);
187 #else
188 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
189 u32 *rate_n_flags, int index)
190 {}
191 #endif
192
193 /*
194 * Expected throughput metrics for following rates:
195 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
196 * "G" is the only table that supports CCK (the first 4 rates).
197 */
198
199 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
201 };
202
203 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
204 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
205 };
206
207 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
209 };
210
211 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
213 };
214
215 static s32 expected_tpt_mimo2_20MHz[IWL_RATE_COUNT] = {
216 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
217 };
218
219 static s32 expected_tpt_mimo2_20MHzSGI[IWL_RATE_COUNT] = {
220 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
221 };
222
223 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
225 };
226
227 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
229 };
230
231 static s32 expected_tpt_mimo2_40MHz[IWL_RATE_COUNT] = {
232 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
233 };
234
235 static s32 expected_tpt_mimo2_40MHzSGI[IWL_RATE_COUNT] = {
236 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
237 };
238
239 /* Expected throughput metric MIMO3 */
240 static s32 expected_tpt_mimo3_20MHz[IWL_RATE_COUNT] = {
241 0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
242 };
243
244 static s32 expected_tpt_mimo3_20MHzSGI[IWL_RATE_COUNT] = {
245 0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
246 };
247
248 static s32 expected_tpt_mimo3_40MHz[IWL_RATE_COUNT] = {
249 0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
250 };
251
252 static s32 expected_tpt_mimo3_40MHzSGI[IWL_RATE_COUNT] = {
253 0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
254 };
255
256 /* mbps, mcs */
257 const static struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
258 {"1", ""},
259 {"2", ""},
260 {"5.5", ""},
261 {"11", ""},
262 {"6", "BPSK 1/2"},
263 {"9", "BPSK 1/2"},
264 {"12", "QPSK 1/2"},
265 {"18", "QPSK 3/4"},
266 {"24", "16QAM 1/2"},
267 {"36", "16QAM 3/4"},
268 {"48", "64QAM 2/3"},
269 {"54", "64QAM 3/4"},
270 {"60", "64QAM 5/6"}
271 };
272
273 #define MCS_INDEX_PER_STREAM (8)
274
275 static inline u8 rs_extract_rate(u32 rate_n_flags)
276 {
277 return (u8)(rate_n_flags & 0xFF);
278 }
279
280 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
281 {
282 window->data = 0;
283 window->success_counter = 0;
284 window->success_ratio = IWL_INVALID_VALUE;
285 window->counter = 0;
286 window->average_tpt = IWL_INVALID_VALUE;
287 window->stamp = 0;
288 }
289
290 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
291 {
292 return (ant_type & valid_antenna) == ant_type;
293 }
294
295 /*
296 * removes the old data from the statistics. All data that is older than
297 * TID_MAX_TIME_DIFF, will be deleted.
298 */
299 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
300 {
301 /* The oldest age we want to keep */
302 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
303
304 while (tl->queue_count &&
305 (tl->time_stamp < oldest_time)) {
306 tl->total -= tl->packet_count[tl->head];
307 tl->packet_count[tl->head] = 0;
308 tl->time_stamp += TID_QUEUE_CELL_SPACING;
309 tl->queue_count--;
310 tl->head++;
311 if (tl->head >= TID_QUEUE_MAX_SIZE)
312 tl->head = 0;
313 }
314 }
315
316 /*
317 * increment traffic load value for tid and also remove
318 * any old values if passed the certain time period
319 */
320 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
321 struct ieee80211_hdr *hdr)
322 {
323 u32 curr_time = jiffies_to_msecs(jiffies);
324 u32 time_diff;
325 s32 index;
326 struct iwl_traffic_load *tl = NULL;
327 u8 tid;
328
329 if (ieee80211_is_data_qos(hdr->frame_control)) {
330 u8 *qc = ieee80211_get_qos_ctl(hdr);
331 tid = qc[0] & 0xf;
332 } else
333 return MAX_TID_COUNT;
334
335 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
336 return MAX_TID_COUNT;
337
338 tl = &lq_data->load[tid];
339
340 curr_time -= curr_time % TID_ROUND_VALUE;
341
342 /* Happens only for the first packet. Initialize the data */
343 if (!(tl->queue_count)) {
344 tl->total = 1;
345 tl->time_stamp = curr_time;
346 tl->queue_count = 1;
347 tl->head = 0;
348 tl->packet_count[0] = 1;
349 return MAX_TID_COUNT;
350 }
351
352 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
353 index = time_diff / TID_QUEUE_CELL_SPACING;
354
355 /* The history is too long: remove data that is older than */
356 /* TID_MAX_TIME_DIFF */
357 if (index >= TID_QUEUE_MAX_SIZE)
358 rs_tl_rm_old_stats(tl, curr_time);
359
360 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
361 tl->packet_count[index] = tl->packet_count[index] + 1;
362 tl->total = tl->total + 1;
363
364 if ((index + 1) > tl->queue_count)
365 tl->queue_count = index + 1;
366
367 return tid;
368 }
369
370 /*
371 get the traffic load value for tid
372 */
373 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
374 {
375 u32 curr_time = jiffies_to_msecs(jiffies);
376 u32 time_diff;
377 s32 index;
378 struct iwl_traffic_load *tl = NULL;
379
380 if (tid >= TID_MAX_LOAD_COUNT)
381 return 0;
382
383 tl = &(lq_data->load[tid]);
384
385 curr_time -= curr_time % TID_ROUND_VALUE;
386
387 if (!(tl->queue_count))
388 return 0;
389
390 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
391 index = time_diff / TID_QUEUE_CELL_SPACING;
392
393 /* The history is too long: remove data that is older than */
394 /* TID_MAX_TIME_DIFF */
395 if (index >= TID_QUEUE_MAX_SIZE)
396 rs_tl_rm_old_stats(tl, curr_time);
397
398 return tl->total;
399 }
400
401 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
402 struct iwl_lq_sta *lq_data, u8 tid,
403 struct ieee80211_sta *sta)
404 {
405 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
406 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
407 sta->addr, tid);
408 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
409 }
410 }
411
412 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
413 struct iwl_lq_sta *lq_data,
414 struct ieee80211_sta *sta)
415 {
416 if ((tid < TID_MAX_LOAD_COUNT))
417 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
418 else if (tid == IWL_AGG_ALL_TID)
419 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
420 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
421 }
422
423 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
424 {
425 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
426 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
427 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
428 }
429
430 /**
431 * rs_collect_tx_data - Update the success/failure sliding window
432 *
433 * We keep a sliding window of the last 62 packets transmitted
434 * at this rate. window->data contains the bitmask of successful
435 * packets.
436 */
437 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
438 int scale_index, s32 tpt, int retries,
439 int successes)
440 {
441 struct iwl_rate_scale_data *window = NULL;
442 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
443 s32 fail_count;
444
445 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
446 return -EINVAL;
447
448 /* Select data for current tx bit rate */
449 window = &(windows[scale_index]);
450
451 /*
452 * Keep track of only the latest 62 tx frame attempts in this rate's
453 * history window; anything older isn't really relevant any more.
454 * If we have filled up the sliding window, drop the oldest attempt;
455 * if the oldest attempt (highest bit in bitmap) shows "success",
456 * subtract "1" from the success counter (this is the main reason
457 * we keep these bitmaps!).
458 */
459 while (retries > 0) {
460 if (window->counter >= IWL_RATE_MAX_WINDOW) {
461
462 /* remove earliest */
463 window->counter = IWL_RATE_MAX_WINDOW - 1;
464
465 if (window->data & mask) {
466 window->data &= ~mask;
467 window->success_counter--;
468 }
469 }
470
471 /* Increment frames-attempted counter */
472 window->counter++;
473
474 /* Shift bitmap by one frame (throw away oldest history),
475 * OR in "1", and increment "success" if this
476 * frame was successful. */
477 window->data <<= 1;
478 if (successes > 0) {
479 window->success_counter++;
480 window->data |= 0x1;
481 successes--;
482 }
483
484 retries--;
485 }
486
487 /* Calculate current success ratio, avoid divide-by-0! */
488 if (window->counter > 0)
489 window->success_ratio = 128 * (100 * window->success_counter)
490 / window->counter;
491 else
492 window->success_ratio = IWL_INVALID_VALUE;
493
494 fail_count = window->counter - window->success_counter;
495
496 /* Calculate average throughput, if we have enough history. */
497 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
498 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
499 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
500 else
501 window->average_tpt = IWL_INVALID_VALUE;
502
503 /* Tag this window as having been updated */
504 window->stamp = jiffies;
505
506 return 0;
507 }
508
509 /*
510 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
511 */
512 /* FIXME:RS:remove this function and put the flags statically in the table */
513 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
514 struct iwl_scale_tbl_info *tbl,
515 int index, u8 use_green)
516 {
517 u32 rate_n_flags = 0;
518
519 if (is_legacy(tbl->lq_type)) {
520 rate_n_flags = iwl_rates[index].plcp;
521 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
522 rate_n_flags |= RATE_MCS_CCK_MSK;
523
524 } else if (is_Ht(tbl->lq_type)) {
525 if (index > IWL_LAST_OFDM_RATE) {
526 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
527 index = IWL_LAST_OFDM_RATE;
528 }
529 rate_n_flags = RATE_MCS_HT_MSK;
530
531 if (is_siso(tbl->lq_type))
532 rate_n_flags |= iwl_rates[index].plcp_siso;
533 else if (is_mimo2(tbl->lq_type))
534 rate_n_flags |= iwl_rates[index].plcp_mimo2;
535 else
536 rate_n_flags |= iwl_rates[index].plcp_mimo3;
537 } else {
538 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
539 }
540
541 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
542 RATE_MCS_ANT_ABC_MSK);
543
544 if (is_Ht(tbl->lq_type)) {
545 if (tbl->is_ht40) {
546 if (tbl->is_dup)
547 rate_n_flags |= RATE_MCS_DUP_MSK;
548 else
549 rate_n_flags |= RATE_MCS_HT40_MSK;
550 }
551 if (tbl->is_SGI)
552 rate_n_flags |= RATE_MCS_SGI_MSK;
553
554 if (use_green) {
555 rate_n_flags |= RATE_MCS_GF_MSK;
556 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
557 rate_n_flags &= ~RATE_MCS_SGI_MSK;
558 IWL_ERR(priv, "GF was set with SGI:SISO\n");
559 }
560 }
561 }
562 return rate_n_flags;
563 }
564
565 /*
566 * Interpret uCode API's rate_n_flags format,
567 * fill "search" or "active" tx mode table.
568 */
569 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
570 enum ieee80211_band band,
571 struct iwl_scale_tbl_info *tbl,
572 int *rate_idx)
573 {
574 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
575 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
576 u8 mcs;
577
578 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
579
580 if (*rate_idx == IWL_RATE_INVALID) {
581 *rate_idx = -1;
582 return -EINVAL;
583 }
584 tbl->is_SGI = 0; /* default legacy setup */
585 tbl->is_ht40 = 0;
586 tbl->is_dup = 0;
587 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
588 tbl->lq_type = LQ_NONE;
589 tbl->max_search = IWL_MAX_SEARCH;
590
591 /* legacy rate format */
592 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
593 if (num_of_ant == 1) {
594 if (band == IEEE80211_BAND_5GHZ)
595 tbl->lq_type = LQ_A;
596 else
597 tbl->lq_type = LQ_G;
598 }
599 /* HT rate format */
600 } else {
601 if (rate_n_flags & RATE_MCS_SGI_MSK)
602 tbl->is_SGI = 1;
603
604 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
605 (rate_n_flags & RATE_MCS_DUP_MSK))
606 tbl->is_ht40 = 1;
607
608 if (rate_n_flags & RATE_MCS_DUP_MSK)
609 tbl->is_dup = 1;
610
611 mcs = rs_extract_rate(rate_n_flags);
612
613 /* SISO */
614 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
615 if (num_of_ant == 1)
616 tbl->lq_type = LQ_SISO; /*else NONE*/
617 /* MIMO2 */
618 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
619 if (num_of_ant == 2)
620 tbl->lq_type = LQ_MIMO2;
621 /* MIMO3 */
622 } else {
623 if (num_of_ant == 3) {
624 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
625 tbl->lq_type = LQ_MIMO3;
626 }
627 }
628 }
629 return 0;
630 }
631
632 /* switch to another antenna/antennas and return 1 */
633 /* if no other valid antenna found, return 0 */
634 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
635 struct iwl_scale_tbl_info *tbl)
636 {
637 u8 new_ant_type;
638
639 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
640 return 0;
641
642 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
643 return 0;
644
645 new_ant_type = ant_toggle_lookup[tbl->ant_type];
646
647 while ((new_ant_type != tbl->ant_type) &&
648 !rs_is_valid_ant(valid_ant, new_ant_type))
649 new_ant_type = ant_toggle_lookup[new_ant_type];
650
651 if (new_ant_type == tbl->ant_type)
652 return 0;
653
654 tbl->ant_type = new_ant_type;
655 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
656 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
657 return 1;
658 }
659
660 /**
661 * Green-field mode is valid if the station supports it and
662 * there are no non-GF stations present in the BSS.
663 */
664 static inline u8 rs_use_green(struct ieee80211_sta *sta,
665 struct iwl_ht_info *ht_conf)
666 {
667 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
668 !(ht_conf->non_GF_STA_present);
669 }
670
671 /**
672 * rs_get_supported_rates - get the available rates
673 *
674 * if management frame or broadcast frame only return
675 * basic available rates.
676 *
677 */
678 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
679 struct ieee80211_hdr *hdr,
680 enum iwl_table_type rate_type)
681 {
682 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
683 lq_sta->active_rate_basic)
684 return lq_sta->active_rate_basic;
685
686 if (is_legacy(rate_type)) {
687 return lq_sta->active_legacy_rate;
688 } else {
689 if (is_siso(rate_type))
690 return lq_sta->active_siso_rate;
691 else if (is_mimo2(rate_type))
692 return lq_sta->active_mimo2_rate;
693 else
694 return lq_sta->active_mimo3_rate;
695 }
696 }
697
698 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
699 int rate_type)
700 {
701 u8 high = IWL_RATE_INVALID;
702 u8 low = IWL_RATE_INVALID;
703
704 /* 802.11A or ht walks to the next literal adjacent rate in
705 * the rate table */
706 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
707 int i;
708 u32 mask;
709
710 /* Find the previous rate that is in the rate mask */
711 i = index - 1;
712 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
713 if (rate_mask & mask) {
714 low = i;
715 break;
716 }
717 }
718
719 /* Find the next rate that is in the rate mask */
720 i = index + 1;
721 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
722 if (rate_mask & mask) {
723 high = i;
724 break;
725 }
726 }
727
728 return (high << 8) | low;
729 }
730
731 low = index;
732 while (low != IWL_RATE_INVALID) {
733 low = iwl_rates[low].prev_rs;
734 if (low == IWL_RATE_INVALID)
735 break;
736 if (rate_mask & (1 << low))
737 break;
738 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
739 }
740
741 high = index;
742 while (high != IWL_RATE_INVALID) {
743 high = iwl_rates[high].next_rs;
744 if (high == IWL_RATE_INVALID)
745 break;
746 if (rate_mask & (1 << high))
747 break;
748 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
749 }
750
751 return (high << 8) | low;
752 }
753
754 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
755 struct iwl_scale_tbl_info *tbl,
756 u8 scale_index, u8 ht_possible)
757 {
758 s32 low;
759 u16 rate_mask;
760 u16 high_low;
761 u8 switch_to_legacy = 0;
762 u8 is_green = lq_sta->is_green;
763
764 /* check if we need to switch from HT to legacy rates.
765 * assumption is that mandatory rates (1Mbps or 6Mbps)
766 * are always supported (spec demand) */
767 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
768 switch_to_legacy = 1;
769 scale_index = rs_ht_to_legacy[scale_index];
770 if (lq_sta->band == IEEE80211_BAND_5GHZ)
771 tbl->lq_type = LQ_A;
772 else
773 tbl->lq_type = LQ_G;
774
775 if (num_of_ant(tbl->ant_type) > 1)
776 tbl->ant_type = ANT_A;/*FIXME:RS*/
777
778 tbl->is_ht40 = 0;
779 tbl->is_SGI = 0;
780 tbl->max_search = IWL_MAX_SEARCH;
781 }
782
783 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
784
785 /* Mask with station rate restriction */
786 if (is_legacy(tbl->lq_type)) {
787 /* supp_rates has no CCK bits in A mode */
788 if (lq_sta->band == IEEE80211_BAND_5GHZ)
789 rate_mask = (u16)(rate_mask &
790 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
791 else
792 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
793 }
794
795 /* If we switched from HT to legacy, check current rate */
796 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
797 low = scale_index;
798 goto out;
799 }
800
801 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
802 tbl->lq_type);
803 low = high_low & 0xff;
804
805 if (low == IWL_RATE_INVALID)
806 low = scale_index;
807
808 out:
809 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
810 }
811
812 /*
813 * mac80211 sends us Tx status
814 */
815 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
816 struct ieee80211_sta *sta, void *priv_sta,
817 struct sk_buff *skb)
818 {
819 int status;
820 u8 retries;
821 int rs_index, mac_index, index = 0;
822 struct iwl_lq_sta *lq_sta = priv_sta;
823 struct iwl_link_quality_cmd *table;
824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
825 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
826 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
827 struct iwl_rate_scale_data *window = NULL;
828 struct iwl_rate_scale_data *search_win = NULL;
829 enum mac80211_rate_control_flags mac_flags;
830 u32 tx_rate;
831 struct iwl_scale_tbl_info tbl_type;
832 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
833 u8 active_index = 0;
834 s32 tpt = 0;
835
836 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
837
838 if (!ieee80211_is_data(hdr->frame_control) ||
839 info->flags & IEEE80211_TX_CTL_NO_ACK)
840 return;
841
842 /* This packet was aggregated but doesn't carry rate scale info */
843 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
844 !(info->flags & IEEE80211_TX_STAT_AMPDU))
845 return;
846
847 if (info->flags & IEEE80211_TX_STAT_AMPDU)
848 retries = 0;
849 else
850 retries = info->status.rates[0].count - 1;
851
852 if (retries > 15)
853 retries = 15;
854
855 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
856 !lq_sta->ibss_sta_added)
857 goto out;
858
859 table = &lq_sta->lq;
860 active_index = lq_sta->active_tbl;
861
862 curr_tbl = &(lq_sta->lq_info[active_index]);
863 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
864 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
865 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
866
867 /*
868 * Ignore this Tx frame response if its initial rate doesn't match
869 * that of latest Link Quality command. There may be stragglers
870 * from a previous Link Quality command, but we're no longer interested
871 * in those; they're either from the "active" mode while we're trying
872 * to check "search" mode, or a prior "search" mode after we've moved
873 * to a new "search" mode (which might become the new "active" mode).
874 */
875 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
876 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
877 if (priv->band == IEEE80211_BAND_5GHZ)
878 rs_index -= IWL_FIRST_OFDM_RATE;
879 mac_flags = info->status.rates[0].flags;
880 mac_index = info->status.rates[0].idx;
881 /* For HT packets, map MCS to PLCP */
882 if (mac_flags & IEEE80211_TX_RC_MCS) {
883 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
884 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
885 mac_index++;
886 }
887
888 if ((mac_index < 0) ||
889 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
890 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
891 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
892 (tbl_type.ant_type != info->antenna_sel_tx) ||
893 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
894 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
895 (rs_index != mac_index)) {
896 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
897 /* the last LQ command could failed so the LQ in ucode not
898 * the same in driver sync up
899 */
900 lq_sta->missed_rate_counter++;
901 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
902 lq_sta->missed_rate_counter = 0;
903 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
904 }
905 goto out;
906 }
907
908 lq_sta->missed_rate_counter = 0;
909 /* Update frame history window with "failure" for each Tx retry. */
910 while (retries) {
911 /* Look up the rate and other info used for each tx attempt.
912 * Each tx attempt steps one entry deeper in the rate table. */
913 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
914 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
915 &tbl_type, &rs_index);
916
917 /* If type matches "search" table,
918 * add failure to "search" history */
919 if ((tbl_type.lq_type == search_tbl->lq_type) &&
920 (tbl_type.ant_type == search_tbl->ant_type) &&
921 (tbl_type.is_SGI == search_tbl->is_SGI)) {
922 if (search_tbl->expected_tpt)
923 tpt = search_tbl->expected_tpt[rs_index];
924 else
925 tpt = 0;
926 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
927
928 /* Else if type matches "current/active" table,
929 * add failure to "current/active" history */
930 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
931 (tbl_type.ant_type == curr_tbl->ant_type) &&
932 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
933 if (curr_tbl->expected_tpt)
934 tpt = curr_tbl->expected_tpt[rs_index];
935 else
936 tpt = 0;
937 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
938 }
939
940 /* If not searching for a new mode, increment failed counter
941 * ... this helps determine when to start searching again */
942 if (lq_sta->stay_in_tbl)
943 lq_sta->total_failed++;
944 --retries;
945 index++;
946
947 }
948
949 /*
950 * Find (by rate) the history window to update with final Tx attempt;
951 * if Tx was successful first try, use original rate,
952 * else look up the rate that was, finally, successful.
953 */
954 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
955 lq_sta->last_rate_n_flags = tx_rate;
956 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
957
958 /* Update frame history window with "success" if Tx got ACKed ... */
959 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
960
961 /* If type matches "search" table,
962 * add final tx status to "search" history */
963 if ((tbl_type.lq_type == search_tbl->lq_type) &&
964 (tbl_type.ant_type == search_tbl->ant_type) &&
965 (tbl_type.is_SGI == search_tbl->is_SGI)) {
966 if (search_tbl->expected_tpt)
967 tpt = search_tbl->expected_tpt[rs_index];
968 else
969 tpt = 0;
970 if (info->flags & IEEE80211_TX_STAT_AMPDU)
971 rs_collect_tx_data(search_win, rs_index, tpt,
972 info->status.ampdu_ack_len,
973 info->status.ampdu_ack_map);
974 else
975 rs_collect_tx_data(search_win, rs_index, tpt,
976 1, status);
977 /* Else if type matches "current/active" table,
978 * add final tx status to "current/active" history */
979 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
980 (tbl_type.ant_type == curr_tbl->ant_type) &&
981 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
982 if (curr_tbl->expected_tpt)
983 tpt = curr_tbl->expected_tpt[rs_index];
984 else
985 tpt = 0;
986 if (info->flags & IEEE80211_TX_STAT_AMPDU)
987 rs_collect_tx_data(window, rs_index, tpt,
988 info->status.ampdu_ack_len,
989 info->status.ampdu_ack_map);
990 else
991 rs_collect_tx_data(window, rs_index, tpt,
992 1, status);
993 }
994
995 /* If not searching for new mode, increment success/failed counter
996 * ... these help determine when to start searching again */
997 if (lq_sta->stay_in_tbl) {
998 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
999 lq_sta->total_success += info->status.ampdu_ack_map;
1000 lq_sta->total_failed +=
1001 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
1002 } else {
1003 if (status)
1004 lq_sta->total_success++;
1005 else
1006 lq_sta->total_failed++;
1007 }
1008 }
1009
1010 /* See if there's a better rate or modulation mode to try. */
1011 if (sta && sta->supp_rates[sband->band])
1012 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1013 out:
1014 return;
1015 }
1016
1017 /*
1018 * Begin a period of staying with a selected modulation mode.
1019 * Set "stay_in_tbl" flag to prevent any mode switches.
1020 * Set frame tx success limits according to legacy vs. high-throughput,
1021 * and reset overall (spanning all rates) tx success history statistics.
1022 * These control how long we stay using same modulation mode before
1023 * searching for a new mode.
1024 */
1025 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1026 struct iwl_lq_sta *lq_sta)
1027 {
1028 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1029 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1030 if (is_legacy) {
1031 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1032 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1033 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1034 } else {
1035 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1036 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1037 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1038 }
1039 lq_sta->table_count = 0;
1040 lq_sta->total_failed = 0;
1041 lq_sta->total_success = 0;
1042 lq_sta->flush_timer = jiffies;
1043 lq_sta->action_counter = 0;
1044 }
1045
1046 /*
1047 * Find correct throughput table for given mode of modulation
1048 */
1049 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1050 struct iwl_scale_tbl_info *tbl)
1051 {
1052 if (is_legacy(tbl->lq_type)) {
1053 if (!is_a_band(tbl->lq_type))
1054 tbl->expected_tpt = expected_tpt_G;
1055 else
1056 tbl->expected_tpt = expected_tpt_A;
1057 } else if (is_siso(tbl->lq_type)) {
1058 if (tbl->is_ht40 && !lq_sta->is_dup)
1059 if (tbl->is_SGI)
1060 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1061 else
1062 tbl->expected_tpt = expected_tpt_siso40MHz;
1063 else if (tbl->is_SGI)
1064 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1065 else
1066 tbl->expected_tpt = expected_tpt_siso20MHz;
1067 } else if (is_mimo2(tbl->lq_type)) {
1068 if (tbl->is_ht40 && !lq_sta->is_dup)
1069 if (tbl->is_SGI)
1070 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1071 else
1072 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1073 else if (tbl->is_SGI)
1074 tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1075 else
1076 tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1077 } else if (is_mimo3(tbl->lq_type)) {
1078 if (tbl->is_ht40 && !lq_sta->is_dup)
1079 if (tbl->is_SGI)
1080 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
1081 else
1082 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
1083 else if (tbl->is_SGI)
1084 tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
1085 else
1086 tbl->expected_tpt = expected_tpt_mimo3_20MHz;
1087 } else
1088 tbl->expected_tpt = expected_tpt_G;
1089 }
1090
1091 /*
1092 * Find starting rate for new "search" high-throughput mode of modulation.
1093 * Goal is to find lowest expected rate (under perfect conditions) that is
1094 * above the current measured throughput of "active" mode, to give new mode
1095 * a fair chance to prove itself without too many challenges.
1096 *
1097 * This gets called when transitioning to more aggressive modulation
1098 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1099 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1100 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1101 * bit rate will typically need to increase, but not if performance was bad.
1102 */
1103 static s32 rs_get_best_rate(struct iwl_priv *priv,
1104 struct iwl_lq_sta *lq_sta,
1105 struct iwl_scale_tbl_info *tbl, /* "search" */
1106 u16 rate_mask, s8 index)
1107 {
1108 /* "active" values */
1109 struct iwl_scale_tbl_info *active_tbl =
1110 &(lq_sta->lq_info[lq_sta->active_tbl]);
1111 s32 active_sr = active_tbl->win[index].success_ratio;
1112 s32 active_tpt = active_tbl->expected_tpt[index];
1113
1114 /* expected "search" throughput */
1115 s32 *tpt_tbl = tbl->expected_tpt;
1116
1117 s32 new_rate, high, low, start_hi;
1118 u16 high_low;
1119 s8 rate = index;
1120
1121 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1122
1123 for (; ;) {
1124 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1125 tbl->lq_type);
1126
1127 low = high_low & 0xff;
1128 high = (high_low >> 8) & 0xff;
1129
1130 /*
1131 * Lower the "search" bit rate, to give new "search" mode
1132 * approximately the same throughput as "active" if:
1133 *
1134 * 1) "Active" mode has been working modestly well (but not
1135 * great), and expected "search" throughput (under perfect
1136 * conditions) at candidate rate is above the actual
1137 * measured "active" throughput (but less than expected
1138 * "active" throughput under perfect conditions).
1139 * OR
1140 * 2) "Active" mode has been working perfectly or very well
1141 * and expected "search" throughput (under perfect
1142 * conditions) at candidate rate is above expected
1143 * "active" throughput (under perfect conditions).
1144 */
1145 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1146 ((active_sr > IWL_RATE_DECREASE_TH) &&
1147 (active_sr <= IWL_RATE_HIGH_TH) &&
1148 (tpt_tbl[rate] <= active_tpt))) ||
1149 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1150 (tpt_tbl[rate] > active_tpt))) {
1151
1152 /* (2nd or later pass)
1153 * If we've already tried to raise the rate, and are
1154 * now trying to lower it, use the higher rate. */
1155 if (start_hi != IWL_RATE_INVALID) {
1156 new_rate = start_hi;
1157 break;
1158 }
1159
1160 new_rate = rate;
1161
1162 /* Loop again with lower rate */
1163 if (low != IWL_RATE_INVALID)
1164 rate = low;
1165
1166 /* Lower rate not available, use the original */
1167 else
1168 break;
1169
1170 /* Else try to raise the "search" rate to match "active" */
1171 } else {
1172 /* (2nd or later pass)
1173 * If we've already tried to lower the rate, and are
1174 * now trying to raise it, use the lower rate. */
1175 if (new_rate != IWL_RATE_INVALID)
1176 break;
1177
1178 /* Loop again with higher rate */
1179 else if (high != IWL_RATE_INVALID) {
1180 start_hi = high;
1181 rate = high;
1182
1183 /* Higher rate not available, use the original */
1184 } else {
1185 new_rate = rate;
1186 break;
1187 }
1188 }
1189 }
1190
1191 return new_rate;
1192 }
1193
1194 /*
1195 * Set up search table for MIMO2
1196 */
1197 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1198 struct iwl_lq_sta *lq_sta,
1199 struct ieee80211_conf *conf,
1200 struct ieee80211_sta *sta,
1201 struct iwl_scale_tbl_info *tbl, int index)
1202 {
1203 u16 rate_mask;
1204 s32 rate;
1205 s8 is_green = lq_sta->is_green;
1206
1207 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1208 return -1;
1209
1210 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1211 == WLAN_HT_CAP_SM_PS_STATIC)
1212 return -1;
1213
1214 /* Need both Tx chains/antennas to support MIMO */
1215 if (priv->hw_params.tx_chains_num < 2)
1216 return -1;
1217
1218 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1219
1220 tbl->lq_type = LQ_MIMO2;
1221 tbl->is_dup = lq_sta->is_dup;
1222 tbl->action = 0;
1223 tbl->max_search = IWL_MAX_SEARCH;
1224 rate_mask = lq_sta->active_mimo2_rate;
1225
1226 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1227 tbl->is_ht40 = 1;
1228 else
1229 tbl->is_ht40 = 0;
1230
1231 rs_set_expected_tpt_table(lq_sta, tbl);
1232
1233 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1234
1235 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1236 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1237 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1238 rate, rate_mask);
1239 return -1;
1240 }
1241 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1242
1243 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1244 tbl->current_rate, is_green);
1245 return 0;
1246 }
1247
1248 /*
1249 * Set up search table for MIMO3
1250 */
1251 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1252 struct iwl_lq_sta *lq_sta,
1253 struct ieee80211_conf *conf,
1254 struct ieee80211_sta *sta,
1255 struct iwl_scale_tbl_info *tbl, int index)
1256 {
1257 u16 rate_mask;
1258 s32 rate;
1259 s8 is_green = lq_sta->is_green;
1260
1261 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1262 return -1;
1263
1264 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1265 == WLAN_HT_CAP_SM_PS_STATIC)
1266 return -1;
1267
1268 /* Need both Tx chains/antennas to support MIMO */
1269 if (priv->hw_params.tx_chains_num < 3)
1270 return -1;
1271
1272 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1273
1274 tbl->lq_type = LQ_MIMO3;
1275 tbl->is_dup = lq_sta->is_dup;
1276 tbl->action = 0;
1277 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1278 rate_mask = lq_sta->active_mimo3_rate;
1279
1280 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1281 tbl->is_ht40 = 1;
1282 else
1283 tbl->is_ht40 = 0;
1284
1285 rs_set_expected_tpt_table(lq_sta, tbl);
1286
1287 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1288
1289 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1290 rate, rate_mask);
1291 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1292 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1293 rate, rate_mask);
1294 return -1;
1295 }
1296 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1297
1298 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1299 tbl->current_rate, is_green);
1300 return 0;
1301 }
1302
1303 /*
1304 * Set up search table for SISO
1305 */
1306 static int rs_switch_to_siso(struct iwl_priv *priv,
1307 struct iwl_lq_sta *lq_sta,
1308 struct ieee80211_conf *conf,
1309 struct ieee80211_sta *sta,
1310 struct iwl_scale_tbl_info *tbl, int index)
1311 {
1312 u16 rate_mask;
1313 u8 is_green = lq_sta->is_green;
1314 s32 rate;
1315
1316 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1317 return -1;
1318
1319 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1320
1321 tbl->is_dup = lq_sta->is_dup;
1322 tbl->lq_type = LQ_SISO;
1323 tbl->action = 0;
1324 tbl->max_search = IWL_MAX_SEARCH;
1325 rate_mask = lq_sta->active_siso_rate;
1326
1327 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1328 tbl->is_ht40 = 1;
1329 else
1330 tbl->is_ht40 = 0;
1331
1332 if (is_green)
1333 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1334
1335 rs_set_expected_tpt_table(lq_sta, tbl);
1336 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1337
1338 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1339 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1340 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1341 rate, rate_mask);
1342 return -1;
1343 }
1344 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1345 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1346 tbl->current_rate, is_green);
1347 return 0;
1348 }
1349
1350 /*
1351 * Try to switch to new modulation mode from legacy
1352 */
1353 static int rs_move_legacy_other(struct iwl_priv *priv,
1354 struct iwl_lq_sta *lq_sta,
1355 struct ieee80211_conf *conf,
1356 struct ieee80211_sta *sta,
1357 int index)
1358 {
1359 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1360 struct iwl_scale_tbl_info *search_tbl =
1361 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1362 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1363 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1364 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1365 u8 start_action = tbl->action;
1366 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1367 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1368 int ret = 0;
1369 u8 update_search_tbl_counter = 0;
1370
1371 if (!iwl_ht_enabled(priv))
1372 /* stay in Legacy */
1373 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1374 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1375 tbl->action > IWL_LEGACY_SWITCH_SISO)
1376 tbl->action = IWL_LEGACY_SWITCH_SISO;
1377 for (; ;) {
1378 lq_sta->action_counter++;
1379 switch (tbl->action) {
1380 case IWL_LEGACY_SWITCH_ANTENNA1:
1381 case IWL_LEGACY_SWITCH_ANTENNA2:
1382 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1383
1384 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1385 tx_chains_num <= 1) ||
1386 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1387 tx_chains_num <= 2))
1388 break;
1389
1390 /* Don't change antenna if success has been great */
1391 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1392 break;
1393
1394 /* Set up search table to try other antenna */
1395 memcpy(search_tbl, tbl, sz);
1396
1397 if (rs_toggle_antenna(valid_tx_ant,
1398 &search_tbl->current_rate, search_tbl)) {
1399 update_search_tbl_counter = 1;
1400 rs_set_expected_tpt_table(lq_sta, search_tbl);
1401 goto out;
1402 }
1403 break;
1404 case IWL_LEGACY_SWITCH_SISO:
1405 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1406
1407 /* Set up search table to try SISO */
1408 memcpy(search_tbl, tbl, sz);
1409 search_tbl->is_SGI = 0;
1410 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1411 search_tbl, index);
1412 if (!ret) {
1413 lq_sta->action_counter = 0;
1414 goto out;
1415 }
1416
1417 break;
1418 case IWL_LEGACY_SWITCH_MIMO2_AB:
1419 case IWL_LEGACY_SWITCH_MIMO2_AC:
1420 case IWL_LEGACY_SWITCH_MIMO2_BC:
1421 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1422
1423 /* Set up search table to try MIMO */
1424 memcpy(search_tbl, tbl, sz);
1425 search_tbl->is_SGI = 0;
1426
1427 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1428 search_tbl->ant_type = ANT_AB;
1429 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1430 search_tbl->ant_type = ANT_AC;
1431 else
1432 search_tbl->ant_type = ANT_BC;
1433
1434 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1435 break;
1436
1437 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1438 search_tbl, index);
1439 if (!ret) {
1440 lq_sta->action_counter = 0;
1441 goto out;
1442 }
1443 break;
1444
1445 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1446 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1447
1448 /* Set up search table to try MIMO3 */
1449 memcpy(search_tbl, tbl, sz);
1450 search_tbl->is_SGI = 0;
1451
1452 search_tbl->ant_type = ANT_ABC;
1453
1454 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1455 break;
1456
1457 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1458 search_tbl, index);
1459 if (!ret) {
1460 lq_sta->action_counter = 0;
1461 goto out;
1462 }
1463 break;
1464 }
1465 tbl->action++;
1466 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1467 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1468
1469 if (tbl->action == start_action)
1470 break;
1471
1472 }
1473 search_tbl->lq_type = LQ_NONE;
1474 return 0;
1475
1476 out:
1477 lq_sta->search_better_tbl = 1;
1478 tbl->action++;
1479 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1480 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1481 if (update_search_tbl_counter)
1482 search_tbl->action = tbl->action;
1483 return 0;
1484
1485 }
1486
1487 /*
1488 * Try to switch to new modulation mode from SISO
1489 */
1490 static int rs_move_siso_to_other(struct iwl_priv *priv,
1491 struct iwl_lq_sta *lq_sta,
1492 struct ieee80211_conf *conf,
1493 struct ieee80211_sta *sta, int index)
1494 {
1495 u8 is_green = lq_sta->is_green;
1496 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1497 struct iwl_scale_tbl_info *search_tbl =
1498 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1499 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1500 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1501 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1502 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1503 u8 start_action = tbl->action;
1504 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1505 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1506 u8 update_search_tbl_counter = 0;
1507 int ret;
1508
1509 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1510 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1511 /* stay in SISO */
1512 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1513 }
1514 for (;;) {
1515 lq_sta->action_counter++;
1516 switch (tbl->action) {
1517 case IWL_SISO_SWITCH_ANTENNA1:
1518 case IWL_SISO_SWITCH_ANTENNA2:
1519 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1520
1521 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1522 tx_chains_num <= 1) ||
1523 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1524 tx_chains_num <= 2))
1525 break;
1526
1527 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1528 break;
1529
1530 memcpy(search_tbl, tbl, sz);
1531 if (rs_toggle_antenna(valid_tx_ant,
1532 &search_tbl->current_rate, search_tbl)) {
1533 update_search_tbl_counter = 1;
1534 goto out;
1535 }
1536 break;
1537 case IWL_SISO_SWITCH_MIMO2_AB:
1538 case IWL_SISO_SWITCH_MIMO2_AC:
1539 case IWL_SISO_SWITCH_MIMO2_BC:
1540 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1541 memcpy(search_tbl, tbl, sz);
1542 search_tbl->is_SGI = 0;
1543
1544 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1545 search_tbl->ant_type = ANT_AB;
1546 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1547 search_tbl->ant_type = ANT_AC;
1548 else
1549 search_tbl->ant_type = ANT_BC;
1550
1551 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1552 break;
1553
1554 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1555 search_tbl, index);
1556 if (!ret)
1557 goto out;
1558 break;
1559 case IWL_SISO_SWITCH_GI:
1560 if (!tbl->is_ht40 && !(ht_cap->cap &
1561 IEEE80211_HT_CAP_SGI_20))
1562 break;
1563 if (tbl->is_ht40 && !(ht_cap->cap &
1564 IEEE80211_HT_CAP_SGI_40))
1565 break;
1566
1567 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1568
1569 memcpy(search_tbl, tbl, sz);
1570 if (is_green) {
1571 if (!tbl->is_SGI)
1572 break;
1573 else
1574 IWL_ERR(priv,
1575 "SGI was set in GF+SISO\n");
1576 }
1577 search_tbl->is_SGI = !tbl->is_SGI;
1578 rs_set_expected_tpt_table(lq_sta, search_tbl);
1579 if (tbl->is_SGI) {
1580 s32 tpt = lq_sta->last_tpt / 100;
1581 if (tpt >= search_tbl->expected_tpt[index])
1582 break;
1583 }
1584 search_tbl->current_rate =
1585 rate_n_flags_from_tbl(priv, search_tbl,
1586 index, is_green);
1587 update_search_tbl_counter = 1;
1588 goto out;
1589 case IWL_SISO_SWITCH_MIMO3_ABC:
1590 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1591 memcpy(search_tbl, tbl, sz);
1592 search_tbl->is_SGI = 0;
1593 search_tbl->ant_type = ANT_ABC;
1594
1595 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1596 break;
1597
1598 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1599 search_tbl, index);
1600 if (!ret)
1601 goto out;
1602 break;
1603 }
1604 tbl->action++;
1605 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1606 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1607
1608 if (tbl->action == start_action)
1609 break;
1610 }
1611 search_tbl->lq_type = LQ_NONE;
1612 return 0;
1613
1614 out:
1615 lq_sta->search_better_tbl = 1;
1616 tbl->action++;
1617 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1618 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1619 if (update_search_tbl_counter)
1620 search_tbl->action = tbl->action;
1621
1622 return 0;
1623 }
1624
1625 /*
1626 * Try to switch to new modulation mode from MIMO2
1627 */
1628 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1629 struct iwl_lq_sta *lq_sta,
1630 struct ieee80211_conf *conf,
1631 struct ieee80211_sta *sta, int index)
1632 {
1633 s8 is_green = lq_sta->is_green;
1634 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1635 struct iwl_scale_tbl_info *search_tbl =
1636 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1637 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1638 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1639 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1640 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1641 u8 start_action = tbl->action;
1642 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1643 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1644 u8 update_search_tbl_counter = 0;
1645 int ret;
1646
1647 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1648 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1649 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1650 /* switch in SISO */
1651 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1652 }
1653 for (;;) {
1654 lq_sta->action_counter++;
1655 switch (tbl->action) {
1656 case IWL_MIMO2_SWITCH_ANTENNA1:
1657 case IWL_MIMO2_SWITCH_ANTENNA2:
1658 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1659
1660 if (tx_chains_num <= 2)
1661 break;
1662
1663 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1664 break;
1665
1666 memcpy(search_tbl, tbl, sz);
1667 if (rs_toggle_antenna(valid_tx_ant,
1668 &search_tbl->current_rate, search_tbl)) {
1669 update_search_tbl_counter = 1;
1670 goto out;
1671 }
1672 break;
1673 case IWL_MIMO2_SWITCH_SISO_A:
1674 case IWL_MIMO2_SWITCH_SISO_B:
1675 case IWL_MIMO2_SWITCH_SISO_C:
1676 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1677
1678 /* Set up new search table for SISO */
1679 memcpy(search_tbl, tbl, sz);
1680
1681 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1682 search_tbl->ant_type = ANT_A;
1683 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1684 search_tbl->ant_type = ANT_B;
1685 else
1686 search_tbl->ant_type = ANT_C;
1687
1688 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1689 break;
1690
1691 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1692 search_tbl, index);
1693 if (!ret)
1694 goto out;
1695
1696 break;
1697
1698 case IWL_MIMO2_SWITCH_GI:
1699 if (!tbl->is_ht40 && !(ht_cap->cap &
1700 IEEE80211_HT_CAP_SGI_20))
1701 break;
1702 if (tbl->is_ht40 && !(ht_cap->cap &
1703 IEEE80211_HT_CAP_SGI_40))
1704 break;
1705
1706 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1707
1708 /* Set up new search table for MIMO2 */
1709 memcpy(search_tbl, tbl, sz);
1710 search_tbl->is_SGI = !tbl->is_SGI;
1711 rs_set_expected_tpt_table(lq_sta, search_tbl);
1712 /*
1713 * If active table already uses the fastest possible
1714 * modulation (dual stream with short guard interval),
1715 * and it's working well, there's no need to look
1716 * for a better type of modulation!
1717 */
1718 if (tbl->is_SGI) {
1719 s32 tpt = lq_sta->last_tpt / 100;
1720 if (tpt >= search_tbl->expected_tpt[index])
1721 break;
1722 }
1723 search_tbl->current_rate =
1724 rate_n_flags_from_tbl(priv, search_tbl,
1725 index, is_green);
1726 update_search_tbl_counter = 1;
1727 goto out;
1728
1729 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1730 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1731 memcpy(search_tbl, tbl, sz);
1732 search_tbl->is_SGI = 0;
1733 search_tbl->ant_type = ANT_ABC;
1734
1735 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1736 break;
1737
1738 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1739 search_tbl, index);
1740 if (!ret)
1741 goto out;
1742
1743 break;
1744 }
1745 tbl->action++;
1746 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1747 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1748
1749 if (tbl->action == start_action)
1750 break;
1751 }
1752 search_tbl->lq_type = LQ_NONE;
1753 return 0;
1754 out:
1755 lq_sta->search_better_tbl = 1;
1756 tbl->action++;
1757 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1758 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1759 if (update_search_tbl_counter)
1760 search_tbl->action = tbl->action;
1761
1762 return 0;
1763
1764 }
1765
1766 /*
1767 * Try to switch to new modulation mode from MIMO3
1768 */
1769 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1770 struct iwl_lq_sta *lq_sta,
1771 struct ieee80211_conf *conf,
1772 struct ieee80211_sta *sta, int index)
1773 {
1774 s8 is_green = lq_sta->is_green;
1775 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1776 struct iwl_scale_tbl_info *search_tbl =
1777 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1778 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1779 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1780 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1781 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1782 u8 start_action = tbl->action;
1783 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1784 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1785 int ret;
1786 u8 update_search_tbl_counter = 0;
1787
1788 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1789 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1790 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1791 /* switch in SISO */
1792 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1793 }
1794 for (;;) {
1795 lq_sta->action_counter++;
1796 switch (tbl->action) {
1797 case IWL_MIMO3_SWITCH_ANTENNA1:
1798 case IWL_MIMO3_SWITCH_ANTENNA2:
1799 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1800
1801 if (tx_chains_num <= 3)
1802 break;
1803
1804 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1805 break;
1806
1807 memcpy(search_tbl, tbl, sz);
1808 if (rs_toggle_antenna(valid_tx_ant,
1809 &search_tbl->current_rate, search_tbl))
1810 goto out;
1811 break;
1812 case IWL_MIMO3_SWITCH_SISO_A:
1813 case IWL_MIMO3_SWITCH_SISO_B:
1814 case IWL_MIMO3_SWITCH_SISO_C:
1815 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1816
1817 /* Set up new search table for SISO */
1818 memcpy(search_tbl, tbl, sz);
1819
1820 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1821 search_tbl->ant_type = ANT_A;
1822 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1823 search_tbl->ant_type = ANT_B;
1824 else
1825 search_tbl->ant_type = ANT_C;
1826
1827 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1828 break;
1829
1830 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1831 search_tbl, index);
1832 if (!ret)
1833 goto out;
1834
1835 break;
1836
1837 case IWL_MIMO3_SWITCH_MIMO2_AB:
1838 case IWL_MIMO3_SWITCH_MIMO2_AC:
1839 case IWL_MIMO3_SWITCH_MIMO2_BC:
1840 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1841
1842 memcpy(search_tbl, tbl, sz);
1843 search_tbl->is_SGI = 0;
1844 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1845 search_tbl->ant_type = ANT_AB;
1846 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1847 search_tbl->ant_type = ANT_AC;
1848 else
1849 search_tbl->ant_type = ANT_BC;
1850
1851 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1852 break;
1853
1854 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1855 search_tbl, index);
1856 if (!ret)
1857 goto out;
1858
1859 break;
1860
1861 case IWL_MIMO3_SWITCH_GI:
1862 if (!tbl->is_ht40 && !(ht_cap->cap &
1863 IEEE80211_HT_CAP_SGI_20))
1864 break;
1865 if (tbl->is_ht40 && !(ht_cap->cap &
1866 IEEE80211_HT_CAP_SGI_40))
1867 break;
1868
1869 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1870
1871 /* Set up new search table for MIMO */
1872 memcpy(search_tbl, tbl, sz);
1873 search_tbl->is_SGI = !tbl->is_SGI;
1874 rs_set_expected_tpt_table(lq_sta, search_tbl);
1875 /*
1876 * If active table already uses the fastest possible
1877 * modulation (dual stream with short guard interval),
1878 * and it's working well, there's no need to look
1879 * for a better type of modulation!
1880 */
1881 if (tbl->is_SGI) {
1882 s32 tpt = lq_sta->last_tpt / 100;
1883 if (tpt >= search_tbl->expected_tpt[index])
1884 break;
1885 }
1886 search_tbl->current_rate =
1887 rate_n_flags_from_tbl(priv, search_tbl,
1888 index, is_green);
1889 update_search_tbl_counter = 1;
1890 goto out;
1891 }
1892 tbl->action++;
1893 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1894 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1895
1896 if (tbl->action == start_action)
1897 break;
1898 }
1899 search_tbl->lq_type = LQ_NONE;
1900 return 0;
1901 out:
1902 lq_sta->search_better_tbl = 1;
1903 tbl->action++;
1904 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1905 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1906 if (update_search_tbl_counter)
1907 search_tbl->action = tbl->action;
1908
1909 return 0;
1910
1911 }
1912
1913 /*
1914 * Check whether we should continue using same modulation mode, or
1915 * begin search for a new mode, based on:
1916 * 1) # tx successes or failures while using this mode
1917 * 2) # times calling this function
1918 * 3) elapsed time in this mode (not used, for now)
1919 */
1920 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1921 {
1922 struct iwl_scale_tbl_info *tbl;
1923 int i;
1924 int active_tbl;
1925 int flush_interval_passed = 0;
1926 struct iwl_priv *priv;
1927
1928 priv = lq_sta->drv;
1929 active_tbl = lq_sta->active_tbl;
1930
1931 tbl = &(lq_sta->lq_info[active_tbl]);
1932
1933 /* If we've been disallowing search, see if we should now allow it */
1934 if (lq_sta->stay_in_tbl) {
1935
1936 /* Elapsed time using current modulation mode */
1937 if (lq_sta->flush_timer)
1938 flush_interval_passed =
1939 time_after(jiffies,
1940 (unsigned long)(lq_sta->flush_timer +
1941 IWL_RATE_SCALE_FLUSH_INTVL));
1942
1943 /*
1944 * Check if we should allow search for new modulation mode.
1945 * If many frames have failed or succeeded, or we've used
1946 * this same modulation for a long time, allow search, and
1947 * reset history stats that keep track of whether we should
1948 * allow a new search. Also (below) reset all bitmaps and
1949 * stats in active history.
1950 */
1951 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1952 (lq_sta->total_success > lq_sta->max_success_limit) ||
1953 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1954 && (flush_interval_passed))) {
1955 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1956 lq_sta->total_failed,
1957 lq_sta->total_success,
1958 flush_interval_passed);
1959
1960 /* Allow search for new mode */
1961 lq_sta->stay_in_tbl = 0; /* only place reset */
1962 lq_sta->total_failed = 0;
1963 lq_sta->total_success = 0;
1964 lq_sta->flush_timer = 0;
1965
1966 /*
1967 * Else if we've used this modulation mode enough repetitions
1968 * (regardless of elapsed time or success/failure), reset
1969 * history bitmaps and rate-specific stats for all rates in
1970 * active table.
1971 */
1972 } else {
1973 lq_sta->table_count++;
1974 if (lq_sta->table_count >=
1975 lq_sta->table_count_limit) {
1976 lq_sta->table_count = 0;
1977
1978 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1979 for (i = 0; i < IWL_RATE_COUNT; i++)
1980 rs_rate_scale_clear_window(
1981 &(tbl->win[i]));
1982 }
1983 }
1984
1985 /* If transitioning to allow "search", reset all history
1986 * bitmaps and stats in active table (this will become the new
1987 * "search" table). */
1988 if (!lq_sta->stay_in_tbl) {
1989 for (i = 0; i < IWL_RATE_COUNT; i++)
1990 rs_rate_scale_clear_window(&(tbl->win[i]));
1991 }
1992 }
1993 }
1994
1995 /*
1996 * setup rate table in uCode
1997 * return rate_n_flags as used in the table
1998 */
1999 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
2000 struct iwl_lq_sta *lq_sta,
2001 struct iwl_scale_tbl_info *tbl,
2002 int index, u8 is_green)
2003 {
2004 u32 rate;
2005
2006 /* Update uCode's rate table. */
2007 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2008 rs_fill_link_cmd(priv, lq_sta, rate);
2009 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2010
2011 return rate;
2012 }
2013
2014 /*
2015 * Do rate scaling and search for new modulation mode.
2016 */
2017 static void rs_rate_scale_perform(struct iwl_priv *priv,
2018 struct sk_buff *skb,
2019 struct ieee80211_sta *sta,
2020 struct iwl_lq_sta *lq_sta)
2021 {
2022 struct ieee80211_hw *hw = priv->hw;
2023 struct ieee80211_conf *conf = &hw->conf;
2024 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2025 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2026 int low = IWL_RATE_INVALID;
2027 int high = IWL_RATE_INVALID;
2028 int index;
2029 int i;
2030 struct iwl_rate_scale_data *window = NULL;
2031 int current_tpt = IWL_INVALID_VALUE;
2032 int low_tpt = IWL_INVALID_VALUE;
2033 int high_tpt = IWL_INVALID_VALUE;
2034 u32 fail_count;
2035 s8 scale_action = 0;
2036 u16 rate_mask;
2037 u8 update_lq = 0;
2038 struct iwl_scale_tbl_info *tbl, *tbl1;
2039 u16 rate_scale_index_msk = 0;
2040 u32 rate;
2041 u8 is_green = 0;
2042 u8 active_tbl = 0;
2043 u8 done_search = 0;
2044 u16 high_low;
2045 s32 sr;
2046 u8 tid = MAX_TID_COUNT;
2047 struct iwl_tid_data *tid_data;
2048
2049 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2050
2051 /* Send management frames and NO_ACK data using lowest rate. */
2052 /* TODO: this could probably be improved.. */
2053 if (!ieee80211_is_data(hdr->frame_control) ||
2054 info->flags & IEEE80211_TX_CTL_NO_ACK)
2055 return;
2056
2057 if (!sta || !lq_sta)
2058 return;
2059
2060 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2061
2062 tid = rs_tl_add_packet(lq_sta, hdr);
2063
2064 /*
2065 * Select rate-scale / modulation-mode table to work with in
2066 * the rest of this function: "search" if searching for better
2067 * modulation mode, or "active" if doing rate scaling within a mode.
2068 */
2069 if (!lq_sta->search_better_tbl)
2070 active_tbl = lq_sta->active_tbl;
2071 else
2072 active_tbl = 1 - lq_sta->active_tbl;
2073
2074 tbl = &(lq_sta->lq_info[active_tbl]);
2075 if (is_legacy(tbl->lq_type))
2076 lq_sta->is_green = 0;
2077 else
2078 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2079 is_green = lq_sta->is_green;
2080
2081 /* current tx rate */
2082 index = lq_sta->last_txrate_idx;
2083
2084 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2085 tbl->lq_type);
2086
2087 /* rates available for this association, and for modulation mode */
2088 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2089
2090 IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
2091
2092 /* mask with station rate restriction */
2093 if (is_legacy(tbl->lq_type)) {
2094 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2095 /* supp_rates has no CCK bits in A mode */
2096 rate_scale_index_msk = (u16) (rate_mask &
2097 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2098 else
2099 rate_scale_index_msk = (u16) (rate_mask &
2100 lq_sta->supp_rates);
2101
2102 } else
2103 rate_scale_index_msk = rate_mask;
2104
2105 if (!rate_scale_index_msk)
2106 rate_scale_index_msk = rate_mask;
2107
2108 if (!((1 << index) & rate_scale_index_msk)) {
2109 IWL_ERR(priv, "Current Rate is not valid\n");
2110 if (lq_sta->search_better_tbl) {
2111 /* revert to active table if search table is not valid*/
2112 tbl->lq_type = LQ_NONE;
2113 lq_sta->search_better_tbl = 0;
2114 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2115 /* get "active" rate info */
2116 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2117 rate = rs_update_rate_tbl(priv, lq_sta,
2118 tbl, index, is_green);
2119 }
2120 return;
2121 }
2122
2123 /* Get expected throughput table and history window for current rate */
2124 if (!tbl->expected_tpt) {
2125 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2126 return;
2127 }
2128
2129 /* force user max rate if set by user */
2130 if ((lq_sta->max_rate_idx != -1) &&
2131 (lq_sta->max_rate_idx < index)) {
2132 index = lq_sta->max_rate_idx;
2133 update_lq = 1;
2134 window = &(tbl->win[index]);
2135 goto lq_update;
2136 }
2137
2138 window = &(tbl->win[index]);
2139
2140 /*
2141 * If there is not enough history to calculate actual average
2142 * throughput, keep analyzing results of more tx frames, without
2143 * changing rate or mode (bypass most of the rest of this function).
2144 * Set up new rate table in uCode only if old rate is not supported
2145 * in current association (use new rate found above).
2146 */
2147 fail_count = window->counter - window->success_counter;
2148 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2149 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2150 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2151 "for index %d\n",
2152 window->success_counter, window->counter, index);
2153
2154 /* Can't calculate this yet; not enough history */
2155 window->average_tpt = IWL_INVALID_VALUE;
2156
2157 /* Should we stay with this modulation mode,
2158 * or search for a new one? */
2159 rs_stay_in_table(lq_sta);
2160
2161 goto out;
2162 }
2163
2164 /* Else we have enough samples; calculate estimate of
2165 * actual average throughput */
2166
2167 BUG_ON(window->average_tpt != ((window->success_ratio *
2168 tbl->expected_tpt[index] + 64) / 128));
2169
2170 /* If we are searching for better modulation mode, check success. */
2171 if (lq_sta->search_better_tbl &&
2172 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2173 /* If good success, continue using the "search" mode;
2174 * no need to send new link quality command, since we're
2175 * continuing to use the setup that we've been trying. */
2176 if (window->average_tpt > lq_sta->last_tpt) {
2177
2178 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2179 "suc=%d cur-tpt=%d old-tpt=%d\n",
2180 window->success_ratio,
2181 window->average_tpt,
2182 lq_sta->last_tpt);
2183
2184 if (!is_legacy(tbl->lq_type))
2185 lq_sta->enable_counter = 1;
2186
2187 /* Swap tables; "search" becomes "active" */
2188 lq_sta->active_tbl = active_tbl;
2189 current_tpt = window->average_tpt;
2190
2191 /* Else poor success; go back to mode in "active" table */
2192 } else {
2193
2194 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2195 "suc=%d cur-tpt=%d old-tpt=%d\n",
2196 window->success_ratio,
2197 window->average_tpt,
2198 lq_sta->last_tpt);
2199
2200 /* Nullify "search" table */
2201 tbl->lq_type = LQ_NONE;
2202
2203 /* Revert to "active" table */
2204 active_tbl = lq_sta->active_tbl;
2205 tbl = &(lq_sta->lq_info[active_tbl]);
2206
2207 /* Revert to "active" rate and throughput info */
2208 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2209 current_tpt = lq_sta->last_tpt;
2210
2211 /* Need to set up a new rate table in uCode */
2212 update_lq = 1;
2213 }
2214
2215 /* Either way, we've made a decision; modulation mode
2216 * search is done, allow rate adjustment next time. */
2217 lq_sta->search_better_tbl = 0;
2218 done_search = 1; /* Don't switch modes below! */
2219 goto lq_update;
2220 }
2221
2222 /* (Else) not in search of better modulation mode, try for better
2223 * starting rate, while staying in this mode. */
2224 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2225 tbl->lq_type);
2226 low = high_low & 0xff;
2227 high = (high_low >> 8) & 0xff;
2228
2229 /* If user set max rate, dont allow higher than user constrain */
2230 if ((lq_sta->max_rate_idx != -1) &&
2231 (lq_sta->max_rate_idx < high))
2232 high = IWL_RATE_INVALID;
2233
2234 sr = window->success_ratio;
2235
2236 /* Collect measured throughputs for current and adjacent rates */
2237 current_tpt = window->average_tpt;
2238 if (low != IWL_RATE_INVALID)
2239 low_tpt = tbl->win[low].average_tpt;
2240 if (high != IWL_RATE_INVALID)
2241 high_tpt = tbl->win[high].average_tpt;
2242
2243 scale_action = 0;
2244
2245 /* Too many failures, decrease rate */
2246 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2247 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2248 scale_action = -1;
2249
2250 /* No throughput measured yet for adjacent rates; try increase. */
2251 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2252 (high_tpt == IWL_INVALID_VALUE)) {
2253
2254 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2255 scale_action = 1;
2256 else if (low != IWL_RATE_INVALID)
2257 scale_action = 0;
2258 }
2259
2260 /* Both adjacent throughputs are measured, but neither one has better
2261 * throughput; we're using the best rate, don't change it! */
2262 else if ((low_tpt != IWL_INVALID_VALUE) &&
2263 (high_tpt != IWL_INVALID_VALUE) &&
2264 (low_tpt < current_tpt) &&
2265 (high_tpt < current_tpt))
2266 scale_action = 0;
2267
2268 /* At least one adjacent rate's throughput is measured,
2269 * and may have better performance. */
2270 else {
2271 /* Higher adjacent rate's throughput is measured */
2272 if (high_tpt != IWL_INVALID_VALUE) {
2273 /* Higher rate has better throughput */
2274 if (high_tpt > current_tpt &&
2275 sr >= IWL_RATE_INCREASE_TH) {
2276 scale_action = 1;
2277 } else {
2278 scale_action = 0;
2279 }
2280
2281 /* Lower adjacent rate's throughput is measured */
2282 } else if (low_tpt != IWL_INVALID_VALUE) {
2283 /* Lower rate has better throughput */
2284 if (low_tpt > current_tpt) {
2285 IWL_DEBUG_RATE(priv,
2286 "decrease rate because of low tpt\n");
2287 scale_action = -1;
2288 } else if (sr >= IWL_RATE_INCREASE_TH) {
2289 scale_action = 1;
2290 }
2291 }
2292 }
2293
2294 /* Sanity check; asked for decrease, but success rate or throughput
2295 * has been good at old rate. Don't change it. */
2296 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2297 ((sr > IWL_RATE_HIGH_TH) ||
2298 (current_tpt > (100 * tbl->expected_tpt[low]))))
2299 scale_action = 0;
2300 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2301 scale_action = -1;
2302 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2303 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2304 scale_action = -1;
2305 switch (scale_action) {
2306 case -1:
2307 /* Decrease starting rate, update uCode's rate table */
2308 if (low != IWL_RATE_INVALID) {
2309 update_lq = 1;
2310 index = low;
2311 }
2312
2313 break;
2314 case 1:
2315 /* Increase starting rate, update uCode's rate table */
2316 if (high != IWL_RATE_INVALID) {
2317 update_lq = 1;
2318 index = high;
2319 }
2320
2321 break;
2322 case 0:
2323 /* No change */
2324 default:
2325 break;
2326 }
2327
2328 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2329 "high %d type %d\n",
2330 index, scale_action, low, high, tbl->lq_type);
2331
2332 lq_update:
2333 /* Replace uCode's rate table for the destination station. */
2334 if (update_lq)
2335 rate = rs_update_rate_tbl(priv, lq_sta,
2336 tbl, index, is_green);
2337
2338 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2339 /* Should we stay with this modulation mode,
2340 * or search for a new one? */
2341 rs_stay_in_table(lq_sta);
2342 }
2343 /*
2344 * Search for new modulation mode if we're:
2345 * 1) Not changing rates right now
2346 * 2) Not just finishing up a search
2347 * 3) Allowing a new search
2348 */
2349 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2350 /* Save current throughput to compare with "search" throughput*/
2351 lq_sta->last_tpt = current_tpt;
2352
2353 /* Select a new "search" modulation mode to try.
2354 * If one is found, set up the new "search" table. */
2355 if (is_legacy(tbl->lq_type))
2356 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2357 else if (is_siso(tbl->lq_type))
2358 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2359 else if (is_mimo2(tbl->lq_type))
2360 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2361 else
2362 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2363
2364 /* If new "search" mode was selected, set up in uCode table */
2365 if (lq_sta->search_better_tbl) {
2366 /* Access the "search" table, clear its history. */
2367 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2368 for (i = 0; i < IWL_RATE_COUNT; i++)
2369 rs_rate_scale_clear_window(&(tbl->win[i]));
2370
2371 /* Use new "search" start rate */
2372 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2373
2374 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2375 tbl->current_rate, index);
2376 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2377 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2378 } else
2379 done_search = 1;
2380 }
2381
2382 if (done_search && !lq_sta->stay_in_tbl) {
2383 /* If the "active" (non-search) mode was legacy,
2384 * and we've tried switching antennas,
2385 * but we haven't been able to try HT modes (not available),
2386 * stay with best antenna legacy modulation for a while
2387 * before next round of mode comparisons. */
2388 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2389 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2390 lq_sta->action_counter > tbl1->max_search) {
2391 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2392 rs_set_stay_in_table(priv, 1, lq_sta);
2393 }
2394
2395 /* If we're in an HT mode, and all 3 mode switch actions
2396 * have been tried and compared, stay in this best modulation
2397 * mode for a while before next round of mode comparisons. */
2398 if (lq_sta->enable_counter &&
2399 (lq_sta->action_counter >= tbl1->max_search) &&
2400 iwl_ht_enabled(priv)) {
2401 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2402 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2403 (tid != MAX_TID_COUNT)) {
2404 tid_data =
2405 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2406 if (tid_data->agg.state == IWL_AGG_OFF) {
2407 IWL_DEBUG_RATE(priv,
2408 "try to aggregate tid %d\n",
2409 tid);
2410 rs_tl_turn_on_agg(priv, tid,
2411 lq_sta, sta);
2412 }
2413 }
2414 rs_set_stay_in_table(priv, 0, lq_sta);
2415 }
2416 }
2417
2418 out:
2419 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2420 i = index;
2421 lq_sta->last_txrate_idx = i;
2422
2423 return;
2424 }
2425
2426
2427 static void rs_initialize_lq(struct iwl_priv *priv,
2428 struct ieee80211_conf *conf,
2429 struct ieee80211_sta *sta,
2430 struct iwl_lq_sta *lq_sta)
2431 {
2432 struct iwl_scale_tbl_info *tbl;
2433 int rate_idx;
2434 int i;
2435 u32 rate;
2436 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
2437 u8 active_tbl = 0;
2438 u8 valid_tx_ant;
2439
2440 if (!sta || !lq_sta)
2441 goto out;
2442
2443 i = lq_sta->last_txrate_idx;
2444
2445 if ((lq_sta->lq.sta_id == 0xff) &&
2446 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2447 goto out;
2448
2449 valid_tx_ant = priv->hw_params.valid_tx_ant;
2450
2451 if (!lq_sta->search_better_tbl)
2452 active_tbl = lq_sta->active_tbl;
2453 else
2454 active_tbl = 1 - lq_sta->active_tbl;
2455
2456 tbl = &(lq_sta->lq_info[active_tbl]);
2457
2458 if ((i < 0) || (i >= IWL_RATE_COUNT))
2459 i = 0;
2460
2461 rate = iwl_rates[i].plcp;
2462 tbl->ant_type = first_antenna(valid_tx_ant);
2463 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2464
2465 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2466 rate |= RATE_MCS_CCK_MSK;
2467
2468 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2469 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2470 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2471
2472 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2473 tbl->current_rate = rate;
2474 rs_set_expected_tpt_table(lq_sta, tbl);
2475 rs_fill_link_cmd(NULL, lq_sta, rate);
2476 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2477 out:
2478 return;
2479 }
2480
2481 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2482 struct ieee80211_tx_rate_control *txrc)
2483 {
2484
2485 struct sk_buff *skb = txrc->skb;
2486 struct ieee80211_supported_band *sband = txrc->sband;
2487 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2488 struct ieee80211_conf *conf = &priv->hw->conf;
2489 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2490 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2491 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2492 struct iwl_lq_sta *lq_sta = priv_sta;
2493 int rate_idx;
2494
2495 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2496
2497 /* Get max rate if user set max rate */
2498 if (lq_sta) {
2499 lq_sta->max_rate_idx = txrc->max_rate_idx;
2500 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2501 (lq_sta->max_rate_idx != -1))
2502 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2503 if ((lq_sta->max_rate_idx < 0) ||
2504 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2505 lq_sta->max_rate_idx = -1;
2506 }
2507
2508 /* Send management frames and NO_ACK data using lowest rate. */
2509 if (rate_control_send_low(sta, priv_sta, txrc))
2510 return;
2511
2512 rate_idx = lq_sta->last_txrate_idx;
2513
2514 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2515 !lq_sta->ibss_sta_added) {
2516 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2517
2518 if (sta_id == IWL_INVALID_STATION) {
2519 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2520 hdr->addr1);
2521 sta_id = iwl_add_station(priv, hdr->addr1,
2522 false, CMD_ASYNC, ht_cap);
2523 }
2524 if ((sta_id != IWL_INVALID_STATION)) {
2525 lq_sta->lq.sta_id = sta_id;
2526 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2527 lq_sta->ibss_sta_added = 1;
2528 rs_initialize_lq(priv, conf, sta, lq_sta);
2529 }
2530 }
2531
2532 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2533 rate_idx -= IWL_FIRST_OFDM_RATE;
2534 /* 6M and 9M shared same MCS index */
2535 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2536 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2537 IWL_RATE_MIMO3_6M_PLCP)
2538 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2539 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2540 IWL_RATE_MIMO2_6M_PLCP)
2541 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2542 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2543 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2544 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2545 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2546 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2547 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2548 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2549 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2550 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2551 } else {
2552 /* Check for invalid rates */
2553 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2554 ((sband->band == IEEE80211_BAND_5GHZ) &&
2555 (rate_idx < IWL_FIRST_OFDM_RATE)))
2556 rate_idx = rate_lowest_index(sband, sta);
2557 /* On valid 5 GHz rate, adjust index */
2558 else if (sband->band == IEEE80211_BAND_5GHZ)
2559 rate_idx -= IWL_FIRST_OFDM_RATE;
2560 info->control.rates[0].flags = 0;
2561 }
2562 info->control.rates[0].idx = rate_idx;
2563
2564 }
2565
2566 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2567 gfp_t gfp)
2568 {
2569 struct iwl_lq_sta *lq_sta;
2570 struct iwl_priv *priv;
2571 int i, j;
2572
2573 priv = (struct iwl_priv *)priv_rate;
2574 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2575
2576 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2577
2578 if (lq_sta == NULL)
2579 return NULL;
2580 lq_sta->lq.sta_id = 0xff;
2581
2582
2583 for (j = 0; j < LQ_SIZE; j++)
2584 for (i = 0; i < IWL_RATE_COUNT; i++)
2585 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2586
2587 return lq_sta;
2588 }
2589
2590 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2591 struct ieee80211_sta *sta, void *priv_sta)
2592 {
2593 int i, j;
2594 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2595 struct ieee80211_conf *conf = &priv->hw->conf;
2596 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2597 struct iwl_lq_sta *lq_sta = priv_sta;
2598
2599 lq_sta->flush_timer = 0;
2600 lq_sta->supp_rates = sta->supp_rates[sband->band];
2601 for (j = 0; j < LQ_SIZE; j++)
2602 for (i = 0; i < IWL_RATE_COUNT; i++)
2603 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2604
2605 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
2606 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2607 * the lowest or the highest rate.. Could consider using RSSI from
2608 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2609 * after assoc.. */
2610
2611 lq_sta->ibss_sta_added = 0;
2612 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2613 u8 sta_id = iwl_find_station(priv,
2614 sta->addr);
2615
2616 /* for IBSS the call are from tasklet */
2617 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2618
2619 if (sta_id == IWL_INVALID_STATION) {
2620 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2621 sta_id = iwl_add_station(priv, sta->addr, false,
2622 CMD_ASYNC, ht_cap);
2623 }
2624 if ((sta_id != IWL_INVALID_STATION)) {
2625 lq_sta->lq.sta_id = sta_id;
2626 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2627 }
2628 /* FIXME: this is w/a remove it later */
2629 priv->assoc_station_added = 1;
2630 }
2631
2632 lq_sta->is_dup = 0;
2633 lq_sta->max_rate_idx = -1;
2634 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2635 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2636 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2637 lq_sta->active_rate_basic = priv->active_rate_basic;
2638 lq_sta->band = priv->band;
2639 /*
2640 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2641 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2642 */
2643 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2644 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2645 lq_sta->active_siso_rate &= ~((u16)0x2);
2646 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2647
2648 /* Same here */
2649 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2650 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2651 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2652 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2653
2654 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2655 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2656 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2657 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2658
2659 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2660 lq_sta->active_siso_rate,
2661 lq_sta->active_mimo2_rate,
2662 lq_sta->active_mimo3_rate);
2663
2664 /* These values will be overridden later */
2665 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2666 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2667
2668 /* as default allow aggregation for all tids */
2669 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2670 lq_sta->drv = priv;
2671
2672 /* Set last_txrate_idx to lowest rate */
2673 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2674 if (sband->band == IEEE80211_BAND_5GHZ)
2675 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2676
2677 rs_initialize_lq(priv, conf, sta, lq_sta);
2678 }
2679
2680 static void rs_fill_link_cmd(struct iwl_priv *priv,
2681 struct iwl_lq_sta *lq_sta, u32 new_rate)
2682 {
2683 struct iwl_scale_tbl_info tbl_type;
2684 int index = 0;
2685 int rate_idx;
2686 int repeat_rate = 0;
2687 u8 ant_toggle_cnt = 0;
2688 u8 use_ht_possible = 1;
2689 u8 valid_tx_ant = 0;
2690 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2691
2692 /* Override starting rate (index 0) if needed for debug purposes */
2693 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2694
2695 /* Interpret new_rate (rate_n_flags) */
2696 memset(&tbl_type, 0, sizeof(tbl_type));
2697 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2698 &tbl_type, &rate_idx);
2699
2700 /* How many times should we repeat the initial rate? */
2701 if (is_legacy(tbl_type.lq_type)) {
2702 ant_toggle_cnt = 1;
2703 repeat_rate = IWL_NUMBER_TRY;
2704 } else {
2705 repeat_rate = IWL_HT_NUMBER_TRY;
2706 }
2707
2708 lq_cmd->general_params.mimo_delimiter =
2709 is_mimo(tbl_type.lq_type) ? 1 : 0;
2710
2711 /* Fill 1st table entry (index 0) */
2712 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2713
2714 if (num_of_ant(tbl_type.ant_type) == 1) {
2715 lq_cmd->general_params.single_stream_ant_msk =
2716 tbl_type.ant_type;
2717 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2718 lq_cmd->general_params.dual_stream_ant_msk =
2719 tbl_type.ant_type;
2720 } /* otherwise we don't modify the existing value */
2721
2722 index++;
2723 repeat_rate--;
2724
2725 if (priv)
2726 valid_tx_ant = priv->hw_params.valid_tx_ant;
2727
2728 /* Fill rest of rate table */
2729 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2730 /* Repeat initial/next rate.
2731 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2732 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2733 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2734 if (is_legacy(tbl_type.lq_type)) {
2735 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2736 ant_toggle_cnt++;
2737 else if (priv &&
2738 rs_toggle_antenna(valid_tx_ant,
2739 &new_rate, &tbl_type))
2740 ant_toggle_cnt = 1;
2741 }
2742
2743 /* Override next rate if needed for debug purposes */
2744 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2745
2746 /* Fill next table entry */
2747 lq_cmd->rs_table[index].rate_n_flags =
2748 cpu_to_le32(new_rate);
2749 repeat_rate--;
2750 index++;
2751 }
2752
2753 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2754 &rate_idx);
2755
2756 /* Indicate to uCode which entries might be MIMO.
2757 * If initial rate was MIMO, this will finally end up
2758 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2759 if (is_mimo(tbl_type.lq_type))
2760 lq_cmd->general_params.mimo_delimiter = index;
2761
2762 /* Get next rate */
2763 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2764 use_ht_possible);
2765
2766 /* How many times should we repeat the next rate? */
2767 if (is_legacy(tbl_type.lq_type)) {
2768 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2769 ant_toggle_cnt++;
2770 else if (priv &&
2771 rs_toggle_antenna(valid_tx_ant,
2772 &new_rate, &tbl_type))
2773 ant_toggle_cnt = 1;
2774
2775 repeat_rate = IWL_NUMBER_TRY;
2776 } else {
2777 repeat_rate = IWL_HT_NUMBER_TRY;
2778 }
2779
2780 /* Don't allow HT rates after next pass.
2781 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2782 use_ht_possible = 0;
2783
2784 /* Override next rate if needed for debug purposes */
2785 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2786
2787 /* Fill next table entry */
2788 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2789
2790 index++;
2791 repeat_rate--;
2792 }
2793
2794 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_MAX;
2795 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2796 lq_cmd->agg_params.agg_time_limit =
2797 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2798 }
2799
2800 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2801 {
2802 return hw->priv;
2803 }
2804 /* rate scale requires free function to be implemented */
2805 static void rs_free(void *priv_rate)
2806 {
2807 return;
2808 }
2809
2810 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2811 void *priv_sta)
2812 {
2813 struct iwl_lq_sta *lq_sta = priv_sta;
2814 struct iwl_priv *priv __maybe_unused = priv_r;
2815
2816 IWL_DEBUG_RATE(priv, "enter\n");
2817 kfree(lq_sta);
2818 IWL_DEBUG_RATE(priv, "leave\n");
2819 }
2820
2821
2822 #ifdef CONFIG_MAC80211_DEBUGFS
2823 static int open_file_generic(struct inode *inode, struct file *file)
2824 {
2825 file->private_data = inode->i_private;
2826 return 0;
2827 }
2828 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2829 u32 *rate_n_flags, int index)
2830 {
2831 struct iwl_priv *priv;
2832 u8 valid_tx_ant;
2833 u8 ant_sel_tx;
2834
2835 priv = lq_sta->drv;
2836 valid_tx_ant = priv->hw_params.valid_tx_ant;
2837 if (lq_sta->dbg_fixed_rate) {
2838 ant_sel_tx =
2839 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2840 >> RATE_MCS_ANT_POS);
2841 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2842 *rate_n_flags = lq_sta->dbg_fixed_rate;
2843 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2844 } else {
2845 lq_sta->dbg_fixed_rate = 0;
2846 IWL_ERR(priv,
2847 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2848 ant_sel_tx, valid_tx_ant);
2849 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2850 }
2851 } else {
2852 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2853 }
2854 }
2855
2856 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2857 const char __user *user_buf, size_t count, loff_t *ppos)
2858 {
2859 struct iwl_lq_sta *lq_sta = file->private_data;
2860 struct iwl_priv *priv;
2861 char buf[64];
2862 int buf_size;
2863 u32 parsed_rate;
2864
2865 priv = lq_sta->drv;
2866 memset(buf, 0, sizeof(buf));
2867 buf_size = min(count, sizeof(buf) - 1);
2868 if (copy_from_user(buf, user_buf, buf_size))
2869 return -EFAULT;
2870
2871 if (sscanf(buf, "%x", &parsed_rate) == 1)
2872 lq_sta->dbg_fixed_rate = parsed_rate;
2873 else
2874 lq_sta->dbg_fixed_rate = 0;
2875
2876 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2877 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2878 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2879 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2880
2881 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2882 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2883
2884 if (lq_sta->dbg_fixed_rate) {
2885 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2886 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2887 }
2888
2889 return count;
2890 }
2891
2892 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2893 char __user *user_buf, size_t count, loff_t *ppos)
2894 {
2895 char *buff;
2896 int desc = 0;
2897 int i = 0;
2898 int index = 0;
2899 ssize_t ret;
2900
2901 struct iwl_lq_sta *lq_sta = file->private_data;
2902 struct iwl_priv *priv;
2903 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2904
2905 priv = lq_sta->drv;
2906 buff = kmalloc(1024, GFP_KERNEL);
2907 if (!buff)
2908 return -ENOMEM;
2909
2910 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2911 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2912 lq_sta->total_failed, lq_sta->total_success,
2913 lq_sta->active_legacy_rate);
2914 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2915 lq_sta->dbg_fixed_rate);
2916 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2917 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2918 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2919 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2920 desc += sprintf(buff+desc, "lq type %s\n",
2921 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2922 if (is_Ht(tbl->lq_type)) {
2923 desc += sprintf(buff+desc, " %s",
2924 (is_siso(tbl->lq_type)) ? "SISO" :
2925 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2926 desc += sprintf(buff+desc, " %s",
2927 (tbl->is_ht40) ? "40MHz" : "20MHz");
2928 desc += sprintf(buff+desc, " %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2929 (lq_sta->is_green) ? "GF enabled" : "");
2930 }
2931 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2932 lq_sta->last_rate_n_flags);
2933 desc += sprintf(buff+desc, "general:"
2934 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2935 lq_sta->lq.general_params.flags,
2936 lq_sta->lq.general_params.mimo_delimiter,
2937 lq_sta->lq.general_params.single_stream_ant_msk,
2938 lq_sta->lq.general_params.dual_stream_ant_msk);
2939
2940 desc += sprintf(buff+desc, "agg:"
2941 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2942 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2943 lq_sta->lq.agg_params.agg_dis_start_th,
2944 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2945
2946 desc += sprintf(buff+desc,
2947 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2948 lq_sta->lq.general_params.start_rate_index[0],
2949 lq_sta->lq.general_params.start_rate_index[1],
2950 lq_sta->lq.general_params.start_rate_index[2],
2951 lq_sta->lq.general_params.start_rate_index[3]);
2952
2953 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2954 index = iwl_hwrate_to_plcp_idx(
2955 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2956 if (is_legacy(tbl->lq_type)) {
2957 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2958 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2959 iwl_rate_mcs[index].mbps);
2960 } else {
2961 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2962 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2963 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2964 }
2965 }
2966
2967 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2968 kfree(buff);
2969 return ret;
2970 }
2971
2972 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2973 .write = rs_sta_dbgfs_scale_table_write,
2974 .read = rs_sta_dbgfs_scale_table_read,
2975 .open = open_file_generic,
2976 };
2977 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2978 char __user *user_buf, size_t count, loff_t *ppos)
2979 {
2980 char *buff;
2981 int desc = 0;
2982 int i, j;
2983 ssize_t ret;
2984
2985 struct iwl_lq_sta *lq_sta = file->private_data;
2986
2987 buff = kmalloc(1024, GFP_KERNEL);
2988 if (!buff)
2989 return -ENOMEM;
2990
2991 for (i = 0; i < LQ_SIZE; i++) {
2992 desc += sprintf(buff+desc,
2993 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2994 "rate=0x%X\n",
2995 lq_sta->active_tbl == i ? "*" : "x",
2996 lq_sta->lq_info[i].lq_type,
2997 lq_sta->lq_info[i].is_SGI,
2998 lq_sta->lq_info[i].is_ht40,
2999 lq_sta->lq_info[i].is_dup,
3000 lq_sta->is_green,
3001 lq_sta->lq_info[i].current_rate);
3002 for (j = 0; j < IWL_RATE_COUNT; j++) {
3003 desc += sprintf(buff+desc,
3004 "counter=%d success=%d %%=%d\n",
3005 lq_sta->lq_info[i].win[j].counter,
3006 lq_sta->lq_info[i].win[j].success_counter,
3007 lq_sta->lq_info[i].win[j].success_ratio);
3008 }
3009 }
3010 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3011 kfree(buff);
3012 return ret;
3013 }
3014
3015 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3016 .read = rs_sta_dbgfs_stats_table_read,
3017 .open = open_file_generic,
3018 };
3019
3020 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3021 char __user *user_buf, size_t count, loff_t *ppos)
3022 {
3023 char buff[120];
3024 int desc = 0;
3025 ssize_t ret;
3026
3027 struct iwl_lq_sta *lq_sta = file->private_data;
3028 struct iwl_priv *priv;
3029 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3030
3031 priv = lq_sta->drv;
3032
3033 if (is_Ht(tbl->lq_type))
3034 desc += sprintf(buff+desc,
3035 "Bit Rate= %d Mb/s\n",
3036 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3037 else
3038 desc += sprintf(buff+desc,
3039 "Bit Rate= %d Mb/s\n",
3040 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3041 desc += sprintf(buff+desc,
3042 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3043 priv->last_rx_rssi, priv->last_rx_noise);
3044 desc += sprintf(buff+desc,
3045 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3046 priv->last_tsf, priv->last_beacon_time);
3047
3048 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3049 return ret;
3050 }
3051
3052 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3053 .read = rs_sta_dbgfs_rate_scale_data_read,
3054 .open = open_file_generic,
3055 };
3056
3057 static void rs_add_debugfs(void *priv, void *priv_sta,
3058 struct dentry *dir)
3059 {
3060 struct iwl_lq_sta *lq_sta = priv_sta;
3061 lq_sta->rs_sta_dbgfs_scale_table_file =
3062 debugfs_create_file("rate_scale_table", 0600, dir,
3063 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3064 lq_sta->rs_sta_dbgfs_stats_table_file =
3065 debugfs_create_file("rate_stats_table", 0600, dir,
3066 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3067 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3068 debugfs_create_file("rate_scale_data", 0600, dir,
3069 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3070 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3071 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3072 &lq_sta->tx_agg_tid_en);
3073
3074 }
3075
3076 static void rs_remove_debugfs(void *priv, void *priv_sta)
3077 {
3078 struct iwl_lq_sta *lq_sta = priv_sta;
3079 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3080 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3081 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3082 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3083 }
3084 #endif
3085
3086 static struct rate_control_ops rs_ops = {
3087 .module = NULL,
3088 .name = RS_NAME,
3089 .tx_status = rs_tx_status,
3090 .get_rate = rs_get_rate,
3091 .rate_init = rs_rate_init,
3092 .alloc = rs_alloc,
3093 .free = rs_free,
3094 .alloc_sta = rs_alloc_sta,
3095 .free_sta = rs_free_sta,
3096 #ifdef CONFIG_MAC80211_DEBUGFS
3097 .add_sta_debugfs = rs_add_debugfs,
3098 .remove_sta_debugfs = rs_remove_debugfs,
3099 #endif
3100 };
3101
3102 int iwlagn_rate_control_register(void)
3103 {
3104 return ieee80211_rate_control_register(&rs_ops);
3105 }
3106
3107 void iwlagn_rate_control_unregister(void)
3108 {
3109 ieee80211_rate_control_unregister(&rs_ops);
3110 }
3111
Linux with added FPC-III support