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_fat; /* 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(const 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 tl = &lq_data->load[tid];
336
337 curr_time -= curr_time % TID_ROUND_VALUE;
338
339 /* Happens only for the first packet. Initialize the data */
340 if (!(tl->queue_count)) {
341 tl->total = 1;
342 tl->time_stamp = curr_time;
343 tl->queue_count = 1;
344 tl->head = 0;
345 tl->packet_count[0] = 1;
346 return MAX_TID_COUNT;
347 }
348
349 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
350 index = time_diff / TID_QUEUE_CELL_SPACING;
351
352 /* The history is too long: remove data that is older than */
353 /* TID_MAX_TIME_DIFF */
354 if (index >= TID_QUEUE_MAX_SIZE)
355 rs_tl_rm_old_stats(tl, curr_time);
356
357 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
358 tl->packet_count[index] = tl->packet_count[index] + 1;
359 tl->total = tl->total + 1;
360
361 if ((index + 1) > tl->queue_count)
362 tl->queue_count = index + 1;
363
364 return tid;
365 }
366
367 /*
368 get the traffic load value for tid
369 */
370 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
371 {
372 u32 curr_time = jiffies_to_msecs(jiffies);
373 u32 time_diff;
374 s32 index;
375 struct iwl_traffic_load *tl = NULL;
376
377 if (tid >= TID_MAX_LOAD_COUNT)
378 return 0;
379
380 tl = &(lq_data->load[tid]);
381
382 curr_time -= curr_time % TID_ROUND_VALUE;
383
384 if (!(tl->queue_count))
385 return 0;
386
387 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
388 index = time_diff / TID_QUEUE_CELL_SPACING;
389
390 /* The history is too long: remove data that is older than */
391 /* TID_MAX_TIME_DIFF */
392 if (index >= TID_QUEUE_MAX_SIZE)
393 rs_tl_rm_old_stats(tl, curr_time);
394
395 return tl->total;
396 }
397
398 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
399 struct iwl_lq_sta *lq_data, u8 tid,
400 struct ieee80211_sta *sta)
401 {
402 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
403 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
404 sta->addr, tid);
405 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
406 }
407 }
408
409 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
410 struct iwl_lq_sta *lq_data,
411 struct ieee80211_sta *sta)
412 {
413 if ((tid < TID_MAX_LOAD_COUNT))
414 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
415 else if (tid == IWL_AGG_ALL_TID)
416 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
417 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
418 if (priv->cfg->use_rts_for_ht) {
419 /*
420 * switch to RTS/CTS if it is the prefer protection method
421 * for HT traffic
422 */
423 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
424 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
425 iwlcore_commit_rxon(priv);
426 }
427 }
428
429 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
430 {
431 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
432 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
433 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
434 }
435
436 /**
437 * rs_collect_tx_data - Update the success/failure sliding window
438 *
439 * We keep a sliding window of the last 62 packets transmitted
440 * at this rate. window->data contains the bitmask of successful
441 * packets.
442 */
443 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
444 int scale_index, s32 tpt, int retries,
445 int successes)
446 {
447 struct iwl_rate_scale_data *window = NULL;
448 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
449 s32 fail_count;
450
451 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
452 return -EINVAL;
453
454 /* Select data for current tx bit rate */
455 window = &(windows[scale_index]);
456
457 /*
458 * Keep track of only the latest 62 tx frame attempts in this rate's
459 * history window; anything older isn't really relevant any more.
460 * If we have filled up the sliding window, drop the oldest attempt;
461 * if the oldest attempt (highest bit in bitmap) shows "success",
462 * subtract "1" from the success counter (this is the main reason
463 * we keep these bitmaps!).
464 */
465 while (retries > 0) {
466 if (window->counter >= IWL_RATE_MAX_WINDOW) {
467
468 /* remove earliest */
469 window->counter = IWL_RATE_MAX_WINDOW - 1;
470
471 if (window->data & mask) {
472 window->data &= ~mask;
473 window->success_counter--;
474 }
475 }
476
477 /* Increment frames-attempted counter */
478 window->counter++;
479
480 /* Shift bitmap by one frame (throw away oldest history),
481 * OR in "1", and increment "success" if this
482 * frame was successful. */
483 window->data <<= 1;
484 if (successes > 0) {
485 window->success_counter++;
486 window->data |= 0x1;
487 successes--;
488 }
489
490 retries--;
491 }
492
493 /* Calculate current success ratio, avoid divide-by-0! */
494 if (window->counter > 0)
495 window->success_ratio = 128 * (100 * window->success_counter)
496 / window->counter;
497 else
498 window->success_ratio = IWL_INVALID_VALUE;
499
500 fail_count = window->counter - window->success_counter;
501
502 /* Calculate average throughput, if we have enough history. */
503 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
504 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
505 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
506 else
507 window->average_tpt = IWL_INVALID_VALUE;
508
509 /* Tag this window as having been updated */
510 window->stamp = jiffies;
511
512 return 0;
513 }
514
515 /*
516 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
517 */
518 /* FIXME:RS:remove this function and put the flags statically in the table */
519 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
520 struct iwl_scale_tbl_info *tbl,
521 int index, u8 use_green)
522 {
523 u32 rate_n_flags = 0;
524
525 if (is_legacy(tbl->lq_type)) {
526 rate_n_flags = iwl_rates[index].plcp;
527 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
528 rate_n_flags |= RATE_MCS_CCK_MSK;
529
530 } else if (is_Ht(tbl->lq_type)) {
531 if (index > IWL_LAST_OFDM_RATE) {
532 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
533 index = IWL_LAST_OFDM_RATE;
534 }
535 rate_n_flags = RATE_MCS_HT_MSK;
536
537 if (is_siso(tbl->lq_type))
538 rate_n_flags |= iwl_rates[index].plcp_siso;
539 else if (is_mimo2(tbl->lq_type))
540 rate_n_flags |= iwl_rates[index].plcp_mimo2;
541 else
542 rate_n_flags |= iwl_rates[index].plcp_mimo3;
543 } else {
544 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
545 }
546
547 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
548 RATE_MCS_ANT_ABC_MSK);
549
550 if (is_Ht(tbl->lq_type)) {
551 if (tbl->is_fat) {
552 if (tbl->is_dup)
553 rate_n_flags |= RATE_MCS_DUP_MSK;
554 else
555 rate_n_flags |= RATE_MCS_FAT_MSK;
556 }
557 if (tbl->is_SGI)
558 rate_n_flags |= RATE_MCS_SGI_MSK;
559
560 if (use_green) {
561 rate_n_flags |= RATE_MCS_GF_MSK;
562 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
563 rate_n_flags &= ~RATE_MCS_SGI_MSK;
564 IWL_ERR(priv, "GF was set with SGI:SISO\n");
565 }
566 }
567 }
568 return rate_n_flags;
569 }
570
571 /*
572 * Interpret uCode API's rate_n_flags format,
573 * fill "search" or "active" tx mode table.
574 */
575 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
576 enum ieee80211_band band,
577 struct iwl_scale_tbl_info *tbl,
578 int *rate_idx)
579 {
580 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
581 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
582 u8 mcs;
583
584 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
585
586 if (*rate_idx == IWL_RATE_INVALID) {
587 *rate_idx = -1;
588 return -EINVAL;
589 }
590 tbl->is_SGI = 0; /* default legacy setup */
591 tbl->is_fat = 0;
592 tbl->is_dup = 0;
593 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
594 tbl->lq_type = LQ_NONE;
595 tbl->max_search = IWL_MAX_SEARCH;
596
597 /* legacy rate format */
598 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
599 if (num_of_ant == 1) {
600 if (band == IEEE80211_BAND_5GHZ)
601 tbl->lq_type = LQ_A;
602 else
603 tbl->lq_type = LQ_G;
604 }
605 /* HT rate format */
606 } else {
607 if (rate_n_flags & RATE_MCS_SGI_MSK)
608 tbl->is_SGI = 1;
609
610 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
611 (rate_n_flags & RATE_MCS_DUP_MSK))
612 tbl->is_fat = 1;
613
614 if (rate_n_flags & RATE_MCS_DUP_MSK)
615 tbl->is_dup = 1;
616
617 mcs = rs_extract_rate(rate_n_flags);
618
619 /* SISO */
620 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
621 if (num_of_ant == 1)
622 tbl->lq_type = LQ_SISO; /*else NONE*/
623 /* MIMO2 */
624 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
625 if (num_of_ant == 2)
626 tbl->lq_type = LQ_MIMO2;
627 /* MIMO3 */
628 } else {
629 if (num_of_ant == 3) {
630 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
631 tbl->lq_type = LQ_MIMO3;
632 }
633 }
634 }
635 return 0;
636 }
637
638 /* switch to another antenna/antennas and return 1 */
639 /* if no other valid antenna found, return 0 */
640 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
641 struct iwl_scale_tbl_info *tbl)
642 {
643 u8 new_ant_type;
644
645 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
646 return 0;
647
648 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
649 return 0;
650
651 new_ant_type = ant_toggle_lookup[tbl->ant_type];
652
653 while ((new_ant_type != tbl->ant_type) &&
654 !rs_is_valid_ant(valid_ant, new_ant_type))
655 new_ant_type = ant_toggle_lookup[new_ant_type];
656
657 if (new_ant_type == tbl->ant_type)
658 return 0;
659
660 tbl->ant_type = new_ant_type;
661 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
662 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
663 return 1;
664 }
665
666 /* in 4965 we don't use greenfield at all */
667 static inline u8 rs_use_green(struct iwl_priv *priv,
668 struct ieee80211_conf *conf)
669 {
670 u8 is_green;
671
672 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
673 is_green = 0;
674 else
675 is_green = (conf_is_ht(conf) &&
676 priv->current_ht_config.is_green_field &&
677 !priv->current_ht_config.non_GF_STA_present);
678 return is_green;
679 }
680
681 /**
682 * rs_get_supported_rates - get the available rates
683 *
684 * if management frame or broadcast frame only return
685 * basic available rates.
686 *
687 */
688 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
689 struct ieee80211_hdr *hdr,
690 enum iwl_table_type rate_type)
691 {
692 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
693 lq_sta->active_rate_basic)
694 return lq_sta->active_rate_basic;
695
696 if (is_legacy(rate_type)) {
697 return lq_sta->active_legacy_rate;
698 } else {
699 if (is_siso(rate_type))
700 return lq_sta->active_siso_rate;
701 else if (is_mimo2(rate_type))
702 return lq_sta->active_mimo2_rate;
703 else
704 return lq_sta->active_mimo3_rate;
705 }
706 }
707
708 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
709 int rate_type)
710 {
711 u8 high = IWL_RATE_INVALID;
712 u8 low = IWL_RATE_INVALID;
713
714 /* 802.11A or ht walks to the next literal adjacent rate in
715 * the rate table */
716 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
717 int i;
718 u32 mask;
719
720 /* Find the previous rate that is in the rate mask */
721 i = index - 1;
722 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
723 if (rate_mask & mask) {
724 low = i;
725 break;
726 }
727 }
728
729 /* Find the next rate that is in the rate mask */
730 i = index + 1;
731 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
732 if (rate_mask & mask) {
733 high = i;
734 break;
735 }
736 }
737
738 return (high << 8) | low;
739 }
740
741 low = index;
742 while (low != IWL_RATE_INVALID) {
743 low = iwl_rates[low].prev_rs;
744 if (low == IWL_RATE_INVALID)
745 break;
746 if (rate_mask & (1 << low))
747 break;
748 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
749 }
750
751 high = index;
752 while (high != IWL_RATE_INVALID) {
753 high = iwl_rates[high].next_rs;
754 if (high == IWL_RATE_INVALID)
755 break;
756 if (rate_mask & (1 << high))
757 break;
758 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
759 }
760
761 return (high << 8) | low;
762 }
763
764 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
765 struct iwl_scale_tbl_info *tbl,
766 u8 scale_index, u8 ht_possible)
767 {
768 s32 low;
769 u16 rate_mask;
770 u16 high_low;
771 u8 switch_to_legacy = 0;
772 u8 is_green = lq_sta->is_green;
773
774 /* check if we need to switch from HT to legacy rates.
775 * assumption is that mandatory rates (1Mbps or 6Mbps)
776 * are always supported (spec demand) */
777 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
778 switch_to_legacy = 1;
779 scale_index = rs_ht_to_legacy[scale_index];
780 if (lq_sta->band == IEEE80211_BAND_5GHZ)
781 tbl->lq_type = LQ_A;
782 else
783 tbl->lq_type = LQ_G;
784
785 if (num_of_ant(tbl->ant_type) > 1)
786 tbl->ant_type = ANT_A;/*FIXME:RS*/
787
788 tbl->is_fat = 0;
789 tbl->is_SGI = 0;
790 tbl->max_search = IWL_MAX_SEARCH;
791 }
792
793 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
794
795 /* Mask with station rate restriction */
796 if (is_legacy(tbl->lq_type)) {
797 /* supp_rates has no CCK bits in A mode */
798 if (lq_sta->band == IEEE80211_BAND_5GHZ)
799 rate_mask = (u16)(rate_mask &
800 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
801 else
802 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
803 }
804
805 /* If we switched from HT to legacy, check current rate */
806 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
807 low = scale_index;
808 goto out;
809 }
810
811 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
812 tbl->lq_type);
813 low = high_low & 0xff;
814
815 if (low == IWL_RATE_INVALID)
816 low = scale_index;
817
818 out:
819 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
820 }
821
822 /*
823 * mac80211 sends us Tx status
824 */
825 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
826 struct ieee80211_sta *sta, void *priv_sta,
827 struct sk_buff *skb)
828 {
829 int status;
830 u8 retries;
831 int rs_index, index = 0;
832 struct iwl_lq_sta *lq_sta = priv_sta;
833 struct iwl_link_quality_cmd *table;
834 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
835 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
836 struct ieee80211_hw *hw = priv->hw;
837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
838 struct iwl_rate_scale_data *window = NULL;
839 struct iwl_rate_scale_data *search_win = NULL;
840 u32 tx_rate;
841 struct iwl_scale_tbl_info tbl_type;
842 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
843 u8 active_index = 0;
844 s32 tpt = 0;
845
846 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
847
848 if (!ieee80211_is_data(hdr->frame_control) ||
849 info->flags & IEEE80211_TX_CTL_NO_ACK)
850 return;
851
852 /* This packet was aggregated but doesn't carry rate scale info */
853 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
854 !(info->flags & IEEE80211_TX_STAT_AMPDU))
855 return;
856
857 if (info->flags & IEEE80211_TX_STAT_AMPDU)
858 retries = 0;
859 else
860 retries = info->status.rates[0].count - 1;
861
862 if (retries > 15)
863 retries = 15;
864
865 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
866 !lq_sta->ibss_sta_added)
867 goto out;
868
869 table = &lq_sta->lq;
870 active_index = lq_sta->active_tbl;
871
872 curr_tbl = &(lq_sta->lq_info[active_index]);
873 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
874 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
875 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
876
877 /*
878 * Ignore this Tx frame response if its initial rate doesn't match
879 * that of latest Link Quality command. There may be stragglers
880 * from a previous Link Quality command, but we're no longer interested
881 * in those; they're either from the "active" mode while we're trying
882 * to check "search" mode, or a prior "search" mode after we've moved
883 * to a new "search" mode (which might become the new "active" mode).
884 */
885 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
886 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
887 if (priv->band == IEEE80211_BAND_5GHZ)
888 rs_index -= IWL_FIRST_OFDM_RATE;
889
890 if ((info->status.rates[0].idx < 0) ||
891 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
892 (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
893 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
894 (tbl_type.ant_type != info->antenna_sel_tx) ||
895 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
896 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
897 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
898 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
899 IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate);
900 /* the last LQ command could failed so the LQ in ucode not
901 * the same in driver sync up
902 */
903 lq_sta->missed_rate_counter++;
904 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
905 lq_sta->missed_rate_counter = 0;
906 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
907 }
908 goto out;
909 }
910
911 lq_sta->missed_rate_counter = 0;
912 /* Update frame history window with "failure" for each Tx retry. */
913 while (retries) {
914 /* Look up the rate and other info used for each tx attempt.
915 * Each tx attempt steps one entry deeper in the rate table. */
916 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
917 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
918 &tbl_type, &rs_index);
919
920 /* If type matches "search" table,
921 * add failure to "search" history */
922 if ((tbl_type.lq_type == search_tbl->lq_type) &&
923 (tbl_type.ant_type == search_tbl->ant_type) &&
924 (tbl_type.is_SGI == search_tbl->is_SGI)) {
925 if (search_tbl->expected_tpt)
926 tpt = search_tbl->expected_tpt[rs_index];
927 else
928 tpt = 0;
929 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
930
931 /* Else if type matches "current/active" table,
932 * add failure to "current/active" history */
933 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
934 (tbl_type.ant_type == curr_tbl->ant_type) &&
935 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
936 if (curr_tbl->expected_tpt)
937 tpt = curr_tbl->expected_tpt[rs_index];
938 else
939 tpt = 0;
940 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
941 }
942
943 /* If not searching for a new mode, increment failed counter
944 * ... this helps determine when to start searching again */
945 if (lq_sta->stay_in_tbl)
946 lq_sta->total_failed++;
947 --retries;
948 index++;
949
950 }
951
952 /*
953 * Find (by rate) the history window to update with final Tx attempt;
954 * if Tx was successful first try, use original rate,
955 * else look up the rate that was, finally, successful.
956 */
957 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
958 lq_sta->last_rate_n_flags = tx_rate;
959 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
960
961 /* Update frame history window with "success" if Tx got ACKed ... */
962 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
963
964 /* If type matches "search" table,
965 * add final tx status to "search" history */
966 if ((tbl_type.lq_type == search_tbl->lq_type) &&
967 (tbl_type.ant_type == search_tbl->ant_type) &&
968 (tbl_type.is_SGI == search_tbl->is_SGI)) {
969 if (search_tbl->expected_tpt)
970 tpt = search_tbl->expected_tpt[rs_index];
971 else
972 tpt = 0;
973 if (info->flags & IEEE80211_TX_STAT_AMPDU)
974 rs_collect_tx_data(search_win, rs_index, tpt,
975 info->status.ampdu_ack_len,
976 info->status.ampdu_ack_map);
977 else
978 rs_collect_tx_data(search_win, rs_index, tpt,
979 1, status);
980 /* Else if type matches "current/active" table,
981 * add final tx status to "current/active" history */
982 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
983 (tbl_type.ant_type == curr_tbl->ant_type) &&
984 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
985 if (curr_tbl->expected_tpt)
986 tpt = curr_tbl->expected_tpt[rs_index];
987 else
988 tpt = 0;
989 if (info->flags & IEEE80211_TX_STAT_AMPDU)
990 rs_collect_tx_data(window, rs_index, tpt,
991 info->status.ampdu_ack_len,
992 info->status.ampdu_ack_map);
993 else
994 rs_collect_tx_data(window, rs_index, tpt,
995 1, status);
996 }
997
998 /* If not searching for new mode, increment success/failed counter
999 * ... these help determine when to start searching again */
1000 if (lq_sta->stay_in_tbl) {
1001 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1002 lq_sta->total_success += info->status.ampdu_ack_map;
1003 lq_sta->total_failed +=
1004 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
1005 } else {
1006 if (status)
1007 lq_sta->total_success++;
1008 else
1009 lq_sta->total_failed++;
1010 }
1011 }
1012
1013 /* See if there's a better rate or modulation mode to try. */
1014 if (sta && sta->supp_rates[sband->band])
1015 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1016 out:
1017 return;
1018 }
1019
1020 /*
1021 * Begin a period of staying with a selected modulation mode.
1022 * Set "stay_in_tbl" flag to prevent any mode switches.
1023 * Set frame tx success limits according to legacy vs. high-throughput,
1024 * and reset overall (spanning all rates) tx success history statistics.
1025 * These control how long we stay using same modulation mode before
1026 * searching for a new mode.
1027 */
1028 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1029 struct iwl_lq_sta *lq_sta)
1030 {
1031 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1032 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1033 if (is_legacy) {
1034 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1035 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1036 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1037 } else {
1038 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1039 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1040 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1041 }
1042 lq_sta->table_count = 0;
1043 lq_sta->total_failed = 0;
1044 lq_sta->total_success = 0;
1045 lq_sta->flush_timer = jiffies;
1046 lq_sta->action_counter = 0;
1047 }
1048
1049 /*
1050 * Find correct throughput table for given mode of modulation
1051 */
1052 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1053 struct iwl_scale_tbl_info *tbl)
1054 {
1055 if (is_legacy(tbl->lq_type)) {
1056 if (!is_a_band(tbl->lq_type))
1057 tbl->expected_tpt = expected_tpt_G;
1058 else
1059 tbl->expected_tpt = expected_tpt_A;
1060 } else if (is_siso(tbl->lq_type)) {
1061 if (tbl->is_fat && !lq_sta->is_dup)
1062 if (tbl->is_SGI)
1063 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1064 else
1065 tbl->expected_tpt = expected_tpt_siso40MHz;
1066 else if (tbl->is_SGI)
1067 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1068 else
1069 tbl->expected_tpt = expected_tpt_siso20MHz;
1070 } else if (is_mimo2(tbl->lq_type)) {
1071 if (tbl->is_fat && !lq_sta->is_dup)
1072 if (tbl->is_SGI)
1073 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1074 else
1075 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1076 else if (tbl->is_SGI)
1077 tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1078 else
1079 tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1080 } else if (is_mimo3(tbl->lq_type)) {
1081 if (tbl->is_fat && !lq_sta->is_dup)
1082 if (tbl->is_SGI)
1083 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
1084 else
1085 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
1086 else if (tbl->is_SGI)
1087 tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
1088 else
1089 tbl->expected_tpt = expected_tpt_mimo3_20MHz;
1090 } else
1091 tbl->expected_tpt = expected_tpt_G;
1092 }
1093
1094 /*
1095 * Find starting rate for new "search" high-throughput mode of modulation.
1096 * Goal is to find lowest expected rate (under perfect conditions) that is
1097 * above the current measured throughput of "active" mode, to give new mode
1098 * a fair chance to prove itself without too many challenges.
1099 *
1100 * This gets called when transitioning to more aggressive modulation
1101 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1102 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1103 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1104 * bit rate will typically need to increase, but not if performance was bad.
1105 */
1106 static s32 rs_get_best_rate(struct iwl_priv *priv,
1107 struct iwl_lq_sta *lq_sta,
1108 struct iwl_scale_tbl_info *tbl, /* "search" */
1109 u16 rate_mask, s8 index)
1110 {
1111 /* "active" values */
1112 struct iwl_scale_tbl_info *active_tbl =
1113 &(lq_sta->lq_info[lq_sta->active_tbl]);
1114 s32 active_sr = active_tbl->win[index].success_ratio;
1115 s32 active_tpt = active_tbl->expected_tpt[index];
1116
1117 /* expected "search" throughput */
1118 s32 *tpt_tbl = tbl->expected_tpt;
1119
1120 s32 new_rate, high, low, start_hi;
1121 u16 high_low;
1122 s8 rate = index;
1123
1124 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1125
1126 for (; ;) {
1127 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1128 tbl->lq_type);
1129
1130 low = high_low & 0xff;
1131 high = (high_low >> 8) & 0xff;
1132
1133 /*
1134 * Lower the "search" bit rate, to give new "search" mode
1135 * approximately the same throughput as "active" if:
1136 *
1137 * 1) "Active" mode has been working modestly well (but not
1138 * great), and expected "search" throughput (under perfect
1139 * conditions) at candidate rate is above the actual
1140 * measured "active" throughput (but less than expected
1141 * "active" throughput under perfect conditions).
1142 * OR
1143 * 2) "Active" mode has been working perfectly or very well
1144 * and expected "search" throughput (under perfect
1145 * conditions) at candidate rate is above expected
1146 * "active" throughput (under perfect conditions).
1147 */
1148 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1149 ((active_sr > IWL_RATE_DECREASE_TH) &&
1150 (active_sr <= IWL_RATE_HIGH_TH) &&
1151 (tpt_tbl[rate] <= active_tpt))) ||
1152 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1153 (tpt_tbl[rate] > active_tpt))) {
1154
1155 /* (2nd or later pass)
1156 * If we've already tried to raise the rate, and are
1157 * now trying to lower it, use the higher rate. */
1158 if (start_hi != IWL_RATE_INVALID) {
1159 new_rate = start_hi;
1160 break;
1161 }
1162
1163 new_rate = rate;
1164
1165 /* Loop again with lower rate */
1166 if (low != IWL_RATE_INVALID)
1167 rate = low;
1168
1169 /* Lower rate not available, use the original */
1170 else
1171 break;
1172
1173 /* Else try to raise the "search" rate to match "active" */
1174 } else {
1175 /* (2nd or later pass)
1176 * If we've already tried to lower the rate, and are
1177 * now trying to raise it, use the lower rate. */
1178 if (new_rate != IWL_RATE_INVALID)
1179 break;
1180
1181 /* Loop again with higher rate */
1182 else if (high != IWL_RATE_INVALID) {
1183 start_hi = high;
1184 rate = high;
1185
1186 /* Higher rate not available, use the original */
1187 } else {
1188 new_rate = rate;
1189 break;
1190 }
1191 }
1192 }
1193
1194 return new_rate;
1195 }
1196
1197 /*
1198 * Set up search table for MIMO2
1199 */
1200 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1201 struct iwl_lq_sta *lq_sta,
1202 struct ieee80211_conf *conf,
1203 struct ieee80211_sta *sta,
1204 struct iwl_scale_tbl_info *tbl, int index)
1205 {
1206 u16 rate_mask;
1207 s32 rate;
1208 s8 is_green = lq_sta->is_green;
1209
1210 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1211 return -1;
1212
1213 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1214 == WLAN_HT_CAP_SM_PS_STATIC)
1215 return -1;
1216
1217 /* Need both Tx chains/antennas to support MIMO */
1218 if (priv->hw_params.tx_chains_num < 2)
1219 return -1;
1220
1221 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1222
1223 tbl->lq_type = LQ_MIMO2;
1224 tbl->is_dup = lq_sta->is_dup;
1225 tbl->action = 0;
1226 tbl->max_search = IWL_MAX_SEARCH;
1227 rate_mask = lq_sta->active_mimo2_rate;
1228
1229 if (iwl_is_fat_tx_allowed(priv, &sta->ht_cap))
1230 tbl->is_fat = 1;
1231 else
1232 tbl->is_fat = 0;
1233
1234 /* FIXME: - don't toggle SGI here
1235 if (tbl->is_fat) {
1236 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1237 tbl->is_SGI = 1;
1238 else
1239 tbl->is_SGI = 0;
1240 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1241 tbl->is_SGI = 1;
1242 else
1243 tbl->is_SGI = 0;
1244 */
1245
1246 rs_set_expected_tpt_table(lq_sta, tbl);
1247
1248 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1249
1250 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1251 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1252 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1253 rate, rate_mask);
1254 return -1;
1255 }
1256 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1257
1258 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1259 tbl->current_rate, is_green);
1260 return 0;
1261 }
1262
1263 /*
1264 * Set up search table for MIMO3
1265 */
1266 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1267 struct iwl_lq_sta *lq_sta,
1268 struct ieee80211_conf *conf,
1269 struct ieee80211_sta *sta,
1270 struct iwl_scale_tbl_info *tbl, int index)
1271 {
1272 u16 rate_mask;
1273 s32 rate;
1274 s8 is_green = lq_sta->is_green;
1275
1276 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1277 return -1;
1278
1279 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1280 == WLAN_HT_CAP_SM_PS_STATIC)
1281 return -1;
1282
1283 /* Need both Tx chains/antennas to support MIMO */
1284 if (priv->hw_params.tx_chains_num < 3)
1285 return -1;
1286
1287 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1288
1289 tbl->lq_type = LQ_MIMO3;
1290 tbl->is_dup = lq_sta->is_dup;
1291 tbl->action = 0;
1292 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1293 rate_mask = lq_sta->active_mimo3_rate;
1294
1295 if (iwl_is_fat_tx_allowed(priv, &sta->ht_cap))
1296 tbl->is_fat = 1;
1297 else
1298 tbl->is_fat = 0;
1299
1300 /* FIXME: - don't toggle SGI here
1301 if (tbl->is_fat) {
1302 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1303 tbl->is_SGI = 1;
1304 else
1305 tbl->is_SGI = 0;
1306 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1307 tbl->is_SGI = 1;
1308 else
1309 tbl->is_SGI = 0;
1310 */
1311
1312 rs_set_expected_tpt_table(lq_sta, tbl);
1313
1314 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1315
1316 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1317 rate, rate_mask);
1318 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1319 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1320 rate, rate_mask);
1321 return -1;
1322 }
1323 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1324
1325 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1326 tbl->current_rate, is_green);
1327 return 0;
1328 }
1329
1330 /*
1331 * Set up search table for SISO
1332 */
1333 static int rs_switch_to_siso(struct iwl_priv *priv,
1334 struct iwl_lq_sta *lq_sta,
1335 struct ieee80211_conf *conf,
1336 struct ieee80211_sta *sta,
1337 struct iwl_scale_tbl_info *tbl, int index)
1338 {
1339 u16 rate_mask;
1340 u8 is_green = lq_sta->is_green;
1341 s32 rate;
1342
1343 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1344 return -1;
1345
1346 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1347
1348 tbl->is_dup = lq_sta->is_dup;
1349 tbl->lq_type = LQ_SISO;
1350 tbl->action = 0;
1351 tbl->max_search = IWL_MAX_SEARCH;
1352 rate_mask = lq_sta->active_siso_rate;
1353
1354 if (iwl_is_fat_tx_allowed(priv, &sta->ht_cap))
1355 tbl->is_fat = 1;
1356 else
1357 tbl->is_fat = 0;
1358
1359 /* FIXME: - don't toggle SGI here
1360 if (tbl->is_fat) {
1361 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1362 tbl->is_SGI = 1;
1363 else
1364 tbl->is_SGI = 0;
1365 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1366 tbl->is_SGI = 1;
1367 else
1368 tbl->is_SGI = 0;
1369 */
1370
1371 if (is_green)
1372 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1373
1374 rs_set_expected_tpt_table(lq_sta, tbl);
1375 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1376
1377 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1378 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1379 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1380 rate, rate_mask);
1381 return -1;
1382 }
1383 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1384 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1385 tbl->current_rate, is_green);
1386 return 0;
1387 }
1388
1389 /*
1390 * Try to switch to new modulation mode from legacy
1391 */
1392 static int rs_move_legacy_other(struct iwl_priv *priv,
1393 struct iwl_lq_sta *lq_sta,
1394 struct ieee80211_conf *conf,
1395 struct ieee80211_sta *sta,
1396 int index)
1397 {
1398 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1399 struct iwl_scale_tbl_info *search_tbl =
1400 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1401 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1402 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1403 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1404 u8 start_action = tbl->action;
1405 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1406 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1407 int ret = 0;
1408 u8 update_search_tbl_counter = 0;
1409
1410 for (; ;) {
1411 lq_sta->action_counter++;
1412 switch (tbl->action) {
1413 case IWL_LEGACY_SWITCH_ANTENNA1:
1414 case IWL_LEGACY_SWITCH_ANTENNA2:
1415 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1416
1417 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1418 tx_chains_num <= 1) ||
1419 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1420 tx_chains_num <= 2))
1421 break;
1422
1423 /* Don't change antenna if success has been great */
1424 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1425 break;
1426
1427 /* Set up search table to try other antenna */
1428 memcpy(search_tbl, tbl, sz);
1429
1430 if (rs_toggle_antenna(valid_tx_ant,
1431 &search_tbl->current_rate, search_tbl)) {
1432 update_search_tbl_counter = 1;
1433 rs_set_expected_tpt_table(lq_sta, search_tbl);
1434 goto out;
1435 }
1436 break;
1437 case IWL_LEGACY_SWITCH_SISO:
1438 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1439
1440 /* Set up search table to try SISO */
1441 memcpy(search_tbl, tbl, sz);
1442 search_tbl->is_SGI = 0;
1443 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1444 search_tbl, index);
1445 if (!ret) {
1446 lq_sta->action_counter = 0;
1447 goto out;
1448 }
1449
1450 break;
1451 case IWL_LEGACY_SWITCH_MIMO2_AB:
1452 case IWL_LEGACY_SWITCH_MIMO2_AC:
1453 case IWL_LEGACY_SWITCH_MIMO2_BC:
1454 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1455
1456 /* Set up search table to try MIMO */
1457 memcpy(search_tbl, tbl, sz);
1458 search_tbl->is_SGI = 0;
1459
1460 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1461 search_tbl->ant_type = ANT_AB;
1462 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1463 search_tbl->ant_type = ANT_AC;
1464 else
1465 search_tbl->ant_type = ANT_BC;
1466
1467 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1468 break;
1469
1470 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1471 search_tbl, index);
1472 if (!ret) {
1473 lq_sta->action_counter = 0;
1474 goto out;
1475 }
1476 break;
1477
1478 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1479 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1480
1481 /* Set up search table to try MIMO3 */
1482 memcpy(search_tbl, tbl, sz);
1483 search_tbl->is_SGI = 0;
1484
1485 search_tbl->ant_type = ANT_ABC;
1486
1487 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1488 break;
1489
1490 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1491 search_tbl, index);
1492 if (!ret) {
1493 lq_sta->action_counter = 0;
1494 goto out;
1495 }
1496 break;
1497 }
1498 tbl->action++;
1499 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1500 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1501
1502 if (tbl->action == start_action)
1503 break;
1504
1505 }
1506 search_tbl->lq_type = LQ_NONE;
1507 return 0;
1508
1509 out:
1510 lq_sta->search_better_tbl = 1;
1511 tbl->action++;
1512 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1513 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1514 if (update_search_tbl_counter)
1515 search_tbl->action = tbl->action;
1516 return 0;
1517
1518 }
1519
1520 /*
1521 * Try to switch to new modulation mode from SISO
1522 */
1523 static int rs_move_siso_to_other(struct iwl_priv *priv,
1524 struct iwl_lq_sta *lq_sta,
1525 struct ieee80211_conf *conf,
1526 struct ieee80211_sta *sta, int index)
1527 {
1528 u8 is_green = lq_sta->is_green;
1529 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1530 struct iwl_scale_tbl_info *search_tbl =
1531 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1532 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1533 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1534 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1535 u8 start_action = tbl->action;
1536 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1537 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1538 u8 update_search_tbl_counter = 0;
1539 int ret;
1540
1541 for (;;) {
1542 lq_sta->action_counter++;
1543 switch (tbl->action) {
1544 case IWL_SISO_SWITCH_ANTENNA1:
1545 case IWL_SISO_SWITCH_ANTENNA2:
1546 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1547
1548 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1549 tx_chains_num <= 1) ||
1550 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1551 tx_chains_num <= 2))
1552 break;
1553
1554 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1555 break;
1556
1557 memcpy(search_tbl, tbl, sz);
1558 if (rs_toggle_antenna(valid_tx_ant,
1559 &search_tbl->current_rate, search_tbl)) {
1560 update_search_tbl_counter = 1;
1561 goto out;
1562 }
1563 break;
1564 case IWL_SISO_SWITCH_MIMO2_AB:
1565 case IWL_SISO_SWITCH_MIMO2_AC:
1566 case IWL_SISO_SWITCH_MIMO2_BC:
1567 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1568 memcpy(search_tbl, tbl, sz);
1569 search_tbl->is_SGI = 0;
1570
1571 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1572 search_tbl->ant_type = ANT_AB;
1573 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1574 search_tbl->ant_type = ANT_AC;
1575 else
1576 search_tbl->ant_type = ANT_BC;
1577
1578 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1579 break;
1580
1581 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1582 search_tbl, index);
1583 if (!ret)
1584 goto out;
1585 break;
1586 case IWL_SISO_SWITCH_GI:
1587 if (!tbl->is_fat &&
1588 !(priv->current_ht_config.sgf &
1589 HT_SHORT_GI_20MHZ))
1590 break;
1591 if (tbl->is_fat &&
1592 !(priv->current_ht_config.sgf &
1593 HT_SHORT_GI_40MHZ))
1594 break;
1595
1596 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1597
1598 memcpy(search_tbl, tbl, sz);
1599 if (is_green) {
1600 if (!tbl->is_SGI)
1601 break;
1602 else
1603 IWL_ERR(priv,
1604 "SGI was set in GF+SISO\n");
1605 }
1606 search_tbl->is_SGI = !tbl->is_SGI;
1607 rs_set_expected_tpt_table(lq_sta, search_tbl);
1608 if (tbl->is_SGI) {
1609 s32 tpt = lq_sta->last_tpt / 100;
1610 if (tpt >= search_tbl->expected_tpt[index])
1611 break;
1612 }
1613 search_tbl->current_rate =
1614 rate_n_flags_from_tbl(priv, search_tbl,
1615 index, is_green);
1616 update_search_tbl_counter = 1;
1617 goto out;
1618 case IWL_SISO_SWITCH_MIMO3_ABC:
1619 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1620 memcpy(search_tbl, tbl, sz);
1621 search_tbl->is_SGI = 0;
1622 search_tbl->ant_type = ANT_ABC;
1623
1624 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1625 break;
1626
1627 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1628 search_tbl, index);
1629 if (!ret)
1630 goto out;
1631 break;
1632 }
1633 tbl->action++;
1634 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1635 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1636
1637 if (tbl->action == start_action)
1638 break;
1639 }
1640 search_tbl->lq_type = LQ_NONE;
1641 return 0;
1642
1643 out:
1644 lq_sta->search_better_tbl = 1;
1645 tbl->action++;
1646 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1647 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648 if (update_search_tbl_counter)
1649 search_tbl->action = tbl->action;
1650
1651 return 0;
1652 }
1653
1654 /*
1655 * Try to switch to new modulation mode from MIMO2
1656 */
1657 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1658 struct iwl_lq_sta *lq_sta,
1659 struct ieee80211_conf *conf,
1660 struct ieee80211_sta *sta, int index)
1661 {
1662 s8 is_green = lq_sta->is_green;
1663 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1664 struct iwl_scale_tbl_info *search_tbl =
1665 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1666 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1667 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1668 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1669 u8 start_action = tbl->action;
1670 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1671 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1672 u8 update_search_tbl_counter = 0;
1673 int ret;
1674
1675 for (;;) {
1676 lq_sta->action_counter++;
1677 switch (tbl->action) {
1678 case IWL_MIMO2_SWITCH_ANTENNA1:
1679 case IWL_MIMO2_SWITCH_ANTENNA2:
1680 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1681
1682 if (tx_chains_num <= 2)
1683 break;
1684
1685 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1686 break;
1687
1688 memcpy(search_tbl, tbl, sz);
1689 if (rs_toggle_antenna(valid_tx_ant,
1690 &search_tbl->current_rate, search_tbl)) {
1691 update_search_tbl_counter = 1;
1692 goto out;
1693 }
1694 break;
1695 case IWL_MIMO2_SWITCH_SISO_A:
1696 case IWL_MIMO2_SWITCH_SISO_B:
1697 case IWL_MIMO2_SWITCH_SISO_C:
1698 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1699
1700 /* Set up new search table for SISO */
1701 memcpy(search_tbl, tbl, sz);
1702
1703 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1704 search_tbl->ant_type = ANT_A;
1705 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1706 search_tbl->ant_type = ANT_B;
1707 else
1708 search_tbl->ant_type = ANT_C;
1709
1710 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1711 break;
1712
1713 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1714 search_tbl, index);
1715 if (!ret)
1716 goto out;
1717
1718 break;
1719
1720 case IWL_MIMO2_SWITCH_GI:
1721 if (!tbl->is_fat &&
1722 !(priv->current_ht_config.sgf &
1723 HT_SHORT_GI_20MHZ))
1724 break;
1725 if (tbl->is_fat &&
1726 !(priv->current_ht_config.sgf &
1727 HT_SHORT_GI_40MHZ))
1728 break;
1729
1730 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1731
1732 /* Set up new search table for MIMO2 */
1733 memcpy(search_tbl, tbl, sz);
1734 search_tbl->is_SGI = !tbl->is_SGI;
1735 rs_set_expected_tpt_table(lq_sta, search_tbl);
1736 /*
1737 * If active table already uses the fastest possible
1738 * modulation (dual stream with short guard interval),
1739 * and it's working well, there's no need to look
1740 * for a better type of modulation!
1741 */
1742 if (tbl->is_SGI) {
1743 s32 tpt = lq_sta->last_tpt / 100;
1744 if (tpt >= search_tbl->expected_tpt[index])
1745 break;
1746 }
1747 search_tbl->current_rate =
1748 rate_n_flags_from_tbl(priv, search_tbl,
1749 index, is_green);
1750 update_search_tbl_counter = 1;
1751 goto out;
1752
1753 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1754 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1755 memcpy(search_tbl, tbl, sz);
1756 search_tbl->is_SGI = 0;
1757 search_tbl->ant_type = ANT_ABC;
1758
1759 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1760 break;
1761
1762 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1763 search_tbl, index);
1764 if (!ret)
1765 goto out;
1766
1767 break;
1768 }
1769 tbl->action++;
1770 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1771 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1772
1773 if (tbl->action == start_action)
1774 break;
1775 }
1776 search_tbl->lq_type = LQ_NONE;
1777 return 0;
1778 out:
1779 lq_sta->search_better_tbl = 1;
1780 tbl->action++;
1781 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1782 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1783 if (update_search_tbl_counter)
1784 search_tbl->action = tbl->action;
1785
1786 return 0;
1787
1788 }
1789
1790 /*
1791 * Try to switch to new modulation mode from MIMO3
1792 */
1793 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1794 struct iwl_lq_sta *lq_sta,
1795 struct ieee80211_conf *conf,
1796 struct ieee80211_sta *sta, int index)
1797 {
1798 s8 is_green = lq_sta->is_green;
1799 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1800 struct iwl_scale_tbl_info *search_tbl =
1801 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1802 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1803 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1804 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1805 u8 start_action = tbl->action;
1806 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1807 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1808 int ret;
1809 u8 update_search_tbl_counter = 0;
1810
1811 for (;;) {
1812 lq_sta->action_counter++;
1813 switch (tbl->action) {
1814 case IWL_MIMO3_SWITCH_ANTENNA1:
1815 case IWL_MIMO3_SWITCH_ANTENNA2:
1816 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1817
1818 if (tx_chains_num <= 3)
1819 break;
1820
1821 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1822 break;
1823
1824 memcpy(search_tbl, tbl, sz);
1825 if (rs_toggle_antenna(valid_tx_ant,
1826 &search_tbl->current_rate, search_tbl))
1827 goto out;
1828 break;
1829 case IWL_MIMO3_SWITCH_SISO_A:
1830 case IWL_MIMO3_SWITCH_SISO_B:
1831 case IWL_MIMO3_SWITCH_SISO_C:
1832 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1833
1834 /* Set up new search table for SISO */
1835 memcpy(search_tbl, tbl, sz);
1836
1837 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1838 search_tbl->ant_type = ANT_A;
1839 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1840 search_tbl->ant_type = ANT_B;
1841 else
1842 search_tbl->ant_type = ANT_C;
1843
1844 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1845 break;
1846
1847 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1848 search_tbl, index);
1849 if (!ret)
1850 goto out;
1851
1852 break;
1853
1854 case IWL_MIMO3_SWITCH_MIMO2_AB:
1855 case IWL_MIMO3_SWITCH_MIMO2_AC:
1856 case IWL_MIMO3_SWITCH_MIMO2_BC:
1857 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1858
1859 memcpy(search_tbl, tbl, sz);
1860 search_tbl->is_SGI = 0;
1861 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1862 search_tbl->ant_type = ANT_AB;
1863 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1864 search_tbl->ant_type = ANT_AC;
1865 else
1866 search_tbl->ant_type = ANT_BC;
1867
1868 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1869 break;
1870
1871 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1872 search_tbl, index);
1873 if (!ret)
1874 goto out;
1875
1876 break;
1877
1878 case IWL_MIMO3_SWITCH_GI:
1879 if (!tbl->is_fat &&
1880 !(priv->current_ht_config.sgf &
1881 HT_SHORT_GI_20MHZ))
1882 break;
1883 if (tbl->is_fat &&
1884 !(priv->current_ht_config.sgf &
1885 HT_SHORT_GI_40MHZ))
1886 break;
1887
1888 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1889
1890 /* Set up new search table for MIMO */
1891 memcpy(search_tbl, tbl, sz);
1892 search_tbl->is_SGI = !tbl->is_SGI;
1893 rs_set_expected_tpt_table(lq_sta, search_tbl);
1894 /*
1895 * If active table already uses the fastest possible
1896 * modulation (dual stream with short guard interval),
1897 * and it's working well, there's no need to look
1898 * for a better type of modulation!
1899 */
1900 if (tbl->is_SGI) {
1901 s32 tpt = lq_sta->last_tpt / 100;
1902 if (tpt >= search_tbl->expected_tpt[index])
1903 break;
1904 }
1905 search_tbl->current_rate =
1906 rate_n_flags_from_tbl(priv, search_tbl,
1907 index, is_green);
1908 update_search_tbl_counter = 1;
1909 goto out;
1910 }
1911 tbl->action++;
1912 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1913 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1914
1915 if (tbl->action == start_action)
1916 break;
1917 }
1918 search_tbl->lq_type = LQ_NONE;
1919 return 0;
1920 out:
1921 lq_sta->search_better_tbl = 1;
1922 tbl->action++;
1923 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1924 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1925 if (update_search_tbl_counter)
1926 search_tbl->action = tbl->action;
1927
1928 return 0;
1929
1930 }
1931
1932 /*
1933 * Check whether we should continue using same modulation mode, or
1934 * begin search for a new mode, based on:
1935 * 1) # tx successes or failures while using this mode
1936 * 2) # times calling this function
1937 * 3) elapsed time in this mode (not used, for now)
1938 */
1939 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1940 {
1941 struct iwl_scale_tbl_info *tbl;
1942 int i;
1943 int active_tbl;
1944 int flush_interval_passed = 0;
1945 struct iwl_priv *priv;
1946
1947 priv = lq_sta->drv;
1948 active_tbl = lq_sta->active_tbl;
1949
1950 tbl = &(lq_sta->lq_info[active_tbl]);
1951
1952 /* If we've been disallowing search, see if we should now allow it */
1953 if (lq_sta->stay_in_tbl) {
1954
1955 /* Elapsed time using current modulation mode */
1956 if (lq_sta->flush_timer)
1957 flush_interval_passed =
1958 time_after(jiffies,
1959 (unsigned long)(lq_sta->flush_timer +
1960 IWL_RATE_SCALE_FLUSH_INTVL));
1961
1962 /*
1963 * Check if we should allow search for new modulation mode.
1964 * If many frames have failed or succeeded, or we've used
1965 * this same modulation for a long time, allow search, and
1966 * reset history stats that keep track of whether we should
1967 * allow a new search. Also (below) reset all bitmaps and
1968 * stats in active history.
1969 */
1970 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1971 (lq_sta->total_success > lq_sta->max_success_limit) ||
1972 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1973 && (flush_interval_passed))) {
1974 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1975 lq_sta->total_failed,
1976 lq_sta->total_success,
1977 flush_interval_passed);
1978
1979 /* Allow search for new mode */
1980 lq_sta->stay_in_tbl = 0; /* only place reset */
1981 lq_sta->total_failed = 0;
1982 lq_sta->total_success = 0;
1983 lq_sta->flush_timer = 0;
1984
1985 /*
1986 * Else if we've used this modulation mode enough repetitions
1987 * (regardless of elapsed time or success/failure), reset
1988 * history bitmaps and rate-specific stats for all rates in
1989 * active table.
1990 */
1991 } else {
1992 lq_sta->table_count++;
1993 if (lq_sta->table_count >=
1994 lq_sta->table_count_limit) {
1995 lq_sta->table_count = 0;
1996
1997 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1998 for (i = 0; i < IWL_RATE_COUNT; i++)
1999 rs_rate_scale_clear_window(
2000 &(tbl->win[i]));
2001 }
2002 }
2003
2004 /* If transitioning to allow "search", reset all history
2005 * bitmaps and stats in active table (this will become the new
2006 * "search" table). */
2007 if (!lq_sta->stay_in_tbl) {
2008 for (i = 0; i < IWL_RATE_COUNT; i++)
2009 rs_rate_scale_clear_window(&(tbl->win[i]));
2010 }
2011 }
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(priv, conf);
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 return;
2111 }
2112
2113 /* Get expected throughput table and history window for current rate */
2114 if (!tbl->expected_tpt) {
2115 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2116 return;
2117 }
2118
2119 /* force user max rate if set by user */
2120 if ((lq_sta->max_rate_idx != -1) &&
2121 (lq_sta->max_rate_idx < index)) {
2122 index = lq_sta->max_rate_idx;
2123 update_lq = 1;
2124 window = &(tbl->win[index]);
2125 goto lq_update;
2126 }
2127
2128 window = &(tbl->win[index]);
2129
2130 /*
2131 * If there is not enough history to calculate actual average
2132 * throughput, keep analyzing results of more tx frames, without
2133 * changing rate or mode (bypass most of the rest of this function).
2134 * Set up new rate table in uCode only if old rate is not supported
2135 * in current association (use new rate found above).
2136 */
2137 fail_count = window->counter - window->success_counter;
2138 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2139 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2140 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2141 "for index %d\n",
2142 window->success_counter, window->counter, index);
2143
2144 /* Can't calculate this yet; not enough history */
2145 window->average_tpt = IWL_INVALID_VALUE;
2146
2147 /* Should we stay with this modulation mode,
2148 * or search for a new one? */
2149 rs_stay_in_table(lq_sta);
2150
2151 goto out;
2152 }
2153
2154 /* Else we have enough samples; calculate estimate of
2155 * actual average throughput */
2156
2157 BUG_ON(window->average_tpt != ((window->success_ratio *
2158 tbl->expected_tpt[index] + 64) / 128));
2159
2160 /* If we are searching for better modulation mode, check success. */
2161 if (lq_sta->search_better_tbl) {
2162
2163 /* If good success, continue using the "search" mode;
2164 * no need to send new link quality command, since we're
2165 * continuing to use the setup that we've been trying. */
2166 if (window->average_tpt > lq_sta->last_tpt) {
2167
2168 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2169 "suc=%d cur-tpt=%d old-tpt=%d\n",
2170 window->success_ratio,
2171 window->average_tpt,
2172 lq_sta->last_tpt);
2173
2174 if (!is_legacy(tbl->lq_type))
2175 lq_sta->enable_counter = 1;
2176
2177 /* Swap tables; "search" becomes "active" */
2178 lq_sta->active_tbl = active_tbl;
2179 current_tpt = window->average_tpt;
2180
2181 /* Else poor success; go back to mode in "active" table */
2182 } else {
2183
2184 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2185 "suc=%d cur-tpt=%d old-tpt=%d\n",
2186 window->success_ratio,
2187 window->average_tpt,
2188 lq_sta->last_tpt);
2189
2190 /* Nullify "search" table */
2191 tbl->lq_type = LQ_NONE;
2192
2193 /* Revert to "active" table */
2194 active_tbl = lq_sta->active_tbl;
2195 tbl = &(lq_sta->lq_info[active_tbl]);
2196
2197 /* Revert to "active" rate and throughput info */
2198 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2199 current_tpt = lq_sta->last_tpt;
2200
2201 /* Need to set up a new rate table in uCode */
2202 update_lq = 1;
2203 }
2204
2205 /* Either way, we've made a decision; modulation mode
2206 * search is done, allow rate adjustment next time. */
2207 lq_sta->search_better_tbl = 0;
2208 done_search = 1; /* Don't switch modes below! */
2209 goto lq_update;
2210 }
2211
2212 /* (Else) not in search of better modulation mode, try for better
2213 * starting rate, while staying in this mode. */
2214 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2215 tbl->lq_type);
2216 low = high_low & 0xff;
2217 high = (high_low >> 8) & 0xff;
2218
2219 /* If user set max rate, dont allow higher than user constrain */
2220 if ((lq_sta->max_rate_idx != -1) &&
2221 (lq_sta->max_rate_idx < high))
2222 high = IWL_RATE_INVALID;
2223
2224 sr = window->success_ratio;
2225
2226 /* Collect measured throughputs for current and adjacent rates */
2227 current_tpt = window->average_tpt;
2228 if (low != IWL_RATE_INVALID)
2229 low_tpt = tbl->win[low].average_tpt;
2230 if (high != IWL_RATE_INVALID)
2231 high_tpt = tbl->win[high].average_tpt;
2232
2233 scale_action = 0;
2234
2235 /* Too many failures, decrease rate */
2236 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2237 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2238 scale_action = -1;
2239
2240 /* No throughput measured yet for adjacent rates; try increase. */
2241 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2242 (high_tpt == IWL_INVALID_VALUE)) {
2243
2244 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2245 scale_action = 1;
2246 else if (low != IWL_RATE_INVALID)
2247 scale_action = 0;
2248 }
2249
2250 /* Both adjacent throughputs are measured, but neither one has better
2251 * throughput; we're using the best rate, don't change it! */
2252 else if ((low_tpt != IWL_INVALID_VALUE) &&
2253 (high_tpt != IWL_INVALID_VALUE) &&
2254 (low_tpt < current_tpt) &&
2255 (high_tpt < current_tpt))
2256 scale_action = 0;
2257
2258 /* At least one adjacent rate's throughput is measured,
2259 * and may have better performance. */
2260 else {
2261 /* Higher adjacent rate's throughput is measured */
2262 if (high_tpt != IWL_INVALID_VALUE) {
2263 /* Higher rate has better throughput */
2264 if (high_tpt > current_tpt &&
2265 sr >= IWL_RATE_INCREASE_TH) {
2266 scale_action = 1;
2267 } else {
2268 scale_action = 0;
2269 }
2270
2271 /* Lower adjacent rate's throughput is measured */
2272 } else if (low_tpt != IWL_INVALID_VALUE) {
2273 /* Lower rate has better throughput */
2274 if (low_tpt > current_tpt) {
2275 IWL_DEBUG_RATE(priv,
2276 "decrease rate because of low tpt\n");
2277 scale_action = -1;
2278 } else if (sr >= IWL_RATE_INCREASE_TH) {
2279 scale_action = 1;
2280 }
2281 }
2282 }
2283
2284 /* Sanity check; asked for decrease, but success rate or throughput
2285 * has been good at old rate. Don't change it. */
2286 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2287 ((sr > IWL_RATE_HIGH_TH) ||
2288 (current_tpt > (100 * tbl->expected_tpt[low]))))
2289 scale_action = 0;
2290
2291 switch (scale_action) {
2292 case -1:
2293 /* Decrease starting rate, update uCode's rate table */
2294 if (low != IWL_RATE_INVALID) {
2295 update_lq = 1;
2296 index = low;
2297 }
2298
2299 break;
2300 case 1:
2301 /* Increase starting rate, update uCode's rate table */
2302 if (high != IWL_RATE_INVALID) {
2303 update_lq = 1;
2304 index = high;
2305 }
2306
2307 break;
2308 case 0:
2309 /* No change */
2310 default:
2311 break;
2312 }
2313
2314 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2315 "high %d type %d\n",
2316 index, scale_action, low, high, tbl->lq_type);
2317
2318 lq_update:
2319 /* Replace uCode's rate table for the destination station. */
2320 if (update_lq) {
2321 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2322 rs_fill_link_cmd(priv, lq_sta, rate);
2323 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2324 }
2325
2326 /* Should we stay with this modulation mode, or search for a new one? */
2327 rs_stay_in_table(lq_sta);
2328
2329 /*
2330 * Search for new modulation mode if we're:
2331 * 1) Not changing rates right now
2332 * 2) Not just finishing up a search
2333 * 3) Allowing a new search
2334 */
2335 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2336 /* Save current throughput to compare with "search" throughput*/
2337 lq_sta->last_tpt = current_tpt;
2338
2339 /* Select a new "search" modulation mode to try.
2340 * If one is found, set up the new "search" table. */
2341 if (is_legacy(tbl->lq_type))
2342 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2343 else if (is_siso(tbl->lq_type))
2344 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2345 else if (is_mimo2(tbl->lq_type))
2346 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2347 else
2348 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2349
2350 /* If new "search" mode was selected, set up in uCode table */
2351 if (lq_sta->search_better_tbl) {
2352 /* Access the "search" table, clear its history. */
2353 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2354 for (i = 0; i < IWL_RATE_COUNT; i++)
2355 rs_rate_scale_clear_window(&(tbl->win[i]));
2356
2357 /* Use new "search" start rate */
2358 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2359
2360 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2361 tbl->current_rate, index);
2362 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2363 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2364 } else
2365 done_search = 1;
2366 }
2367
2368 if (done_search && !lq_sta->stay_in_tbl) {
2369 /* If the "active" (non-search) mode was legacy,
2370 * and we've tried switching antennas,
2371 * but we haven't been able to try HT modes (not available),
2372 * stay with best antenna legacy modulation for a while
2373 * before next round of mode comparisons. */
2374 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2375 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2376 lq_sta->action_counter > tbl1->max_search) {
2377 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2378 rs_set_stay_in_table(priv, 1, lq_sta);
2379 }
2380
2381 /* If we're in an HT mode, and all 3 mode switch actions
2382 * have been tried and compared, stay in this best modulation
2383 * mode for a while before next round of mode comparisons. */
2384 if (lq_sta->enable_counter &&
2385 (lq_sta->action_counter >= tbl1->max_search)) {
2386 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2387 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2388 (tid != MAX_TID_COUNT)) {
2389 tid_data =
2390 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2391 if (tid_data->agg.state == IWL_AGG_OFF) {
2392 IWL_DEBUG_RATE(priv,
2393 "try to aggregate tid %d\n",
2394 tid);
2395 rs_tl_turn_on_agg(priv, tid,
2396 lq_sta, sta);
2397 }
2398 }
2399 rs_set_stay_in_table(priv, 0, lq_sta);
2400 }
2401 }
2402
2403 out:
2404 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2405 i = index;
2406 lq_sta->last_txrate_idx = i;
2407
2408 return;
2409 }
2410
2411
2412 static void rs_initialize_lq(struct iwl_priv *priv,
2413 struct ieee80211_conf *conf,
2414 struct ieee80211_sta *sta,
2415 struct iwl_lq_sta *lq_sta)
2416 {
2417 struct iwl_scale_tbl_info *tbl;
2418 int rate_idx;
2419 int i;
2420 u32 rate;
2421 u8 use_green = rs_use_green(priv, conf);
2422 u8 active_tbl = 0;
2423 u8 valid_tx_ant;
2424
2425 if (!sta || !lq_sta)
2426 goto out;
2427
2428 i = lq_sta->last_txrate_idx;
2429
2430 if ((lq_sta->lq.sta_id == 0xff) &&
2431 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2432 goto out;
2433
2434 valid_tx_ant = priv->hw_params.valid_tx_ant;
2435
2436 if (!lq_sta->search_better_tbl)
2437 active_tbl = lq_sta->active_tbl;
2438 else
2439 active_tbl = 1 - lq_sta->active_tbl;
2440
2441 tbl = &(lq_sta->lq_info[active_tbl]);
2442
2443 if ((i < 0) || (i >= IWL_RATE_COUNT))
2444 i = 0;
2445
2446 rate = iwl_rates[i].plcp;
2447 tbl->ant_type = first_antenna(valid_tx_ant);
2448 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2449
2450 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2451 rate |= RATE_MCS_CCK_MSK;
2452
2453 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2454 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2455 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2456
2457 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2458 tbl->current_rate = rate;
2459 rs_set_expected_tpt_table(lq_sta, tbl);
2460 rs_fill_link_cmd(NULL, lq_sta, rate);
2461 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2462 out:
2463 return;
2464 }
2465
2466 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2467 struct ieee80211_tx_rate_control *txrc)
2468 {
2469
2470 struct sk_buff *skb = txrc->skb;
2471 struct ieee80211_supported_band *sband = txrc->sband;
2472 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2473 struct ieee80211_conf *conf = &priv->hw->conf;
2474 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2475 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2476 struct iwl_lq_sta *lq_sta = priv_sta;
2477 int rate_idx;
2478 u64 mask_bit = 0;
2479
2480 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2481
2482 /* Get max rate if user set max rate */
2483 if (lq_sta) {
2484 lq_sta->max_rate_idx = txrc->max_rate_idx;
2485 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2486 (lq_sta->max_rate_idx != -1))
2487 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2488 if ((lq_sta->max_rate_idx < 0) ||
2489 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2490 lq_sta->max_rate_idx = -1;
2491 }
2492
2493 if (sta)
2494 mask_bit = sta->supp_rates[sband->band];
2495
2496 /* Send management frames and NO_ACK data using lowest rate. */
2497 if (!ieee80211_is_data(hdr->frame_control) ||
2498 info->flags & IEEE80211_TX_CTL_NO_ACK || !sta || !lq_sta) {
2499 if (!mask_bit)
2500 info->control.rates[0].idx =
2501 rate_lowest_index(sband, NULL);
2502 else
2503 info->control.rates[0].idx =
2504 rate_lowest_index(sband, sta);
2505 if (info->flags & IEEE80211_TX_CTL_NO_ACK)
2506 info->control.rates[0].count = 1;
2507 return;
2508 }
2509
2510 rate_idx = lq_sta->last_txrate_idx;
2511
2512 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2513 !lq_sta->ibss_sta_added) {
2514 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2515
2516 if (sta_id == IWL_INVALID_STATION) {
2517 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2518 hdr->addr1);
2519 sta_id = iwl_add_station(priv, hdr->addr1,
2520 false, CMD_ASYNC, NULL);
2521 }
2522 if ((sta_id != IWL_INVALID_STATION)) {
2523 lq_sta->lq.sta_id = sta_id;
2524 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2525 lq_sta->ibss_sta_added = 1;
2526 rs_initialize_lq(priv, conf, sta, lq_sta);
2527 }
2528 }
2529
2530 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2531 rate_idx -= IWL_FIRST_OFDM_RATE;
2532 /* 6M and 9M shared same MCS index */
2533 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2534 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2535 IWL_RATE_MIMO3_6M_PLCP)
2536 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2537 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2538 IWL_RATE_MIMO2_6M_PLCP)
2539 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2540 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2541 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2542 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2543 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2544 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2545 if (lq_sta->last_rate_n_flags & RATE_MCS_FAT_MSK)
2546 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2547 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2548 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2549 } else {
2550 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2551 rate_idx = rate_lowest_index(sband, sta);
2552 else if (sband->band == IEEE80211_BAND_5GHZ)
2553 rate_idx -= IWL_FIRST_OFDM_RATE;
2554 }
2555 info->control.rates[0].idx = rate_idx;
2556
2557 }
2558
2559 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2560 gfp_t gfp)
2561 {
2562 struct iwl_lq_sta *lq_sta;
2563 struct iwl_priv *priv;
2564 int i, j;
2565
2566 priv = (struct iwl_priv *)priv_rate;
2567 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2568
2569 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2570
2571 if (lq_sta == NULL)
2572 return NULL;
2573 lq_sta->lq.sta_id = 0xff;
2574
2575
2576 for (j = 0; j < LQ_SIZE; j++)
2577 for (i = 0; i < IWL_RATE_COUNT; i++)
2578 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2579
2580 return lq_sta;
2581 }
2582
2583 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2584 struct ieee80211_sta *sta, void *priv_sta)
2585 {
2586 int i, j;
2587 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2588 struct ieee80211_conf *conf = &priv->hw->conf;
2589 struct iwl_lq_sta *lq_sta = priv_sta;
2590 u16 mask_bit = 0;
2591 int count;
2592 int start_rate = 0;
2593
2594 lq_sta->flush_timer = 0;
2595 lq_sta->supp_rates = sta->supp_rates[sband->band];
2596 for (j = 0; j < LQ_SIZE; j++)
2597 for (i = 0; i < IWL_RATE_COUNT; i++)
2598 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2599
2600 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
2601 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2602 * the lowest or the highest rate.. Could consider using RSSI from
2603 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2604 * after assoc.. */
2605
2606 lq_sta->ibss_sta_added = 0;
2607 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2608 u8 sta_id = iwl_find_station(priv,
2609 sta->addr);
2610
2611 /* for IBSS the call are from tasklet */
2612 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2613
2614 if (sta_id == IWL_INVALID_STATION) {
2615 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2616 sta_id = iwl_add_station(priv, sta->addr, false,
2617 CMD_ASYNC, NULL);
2618 }
2619 if ((sta_id != IWL_INVALID_STATION)) {
2620 lq_sta->lq.sta_id = sta_id;
2621 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2622 }
2623 /* FIXME: this is w/a remove it later */
2624 priv->assoc_station_added = 1;
2625 }
2626
2627 lq_sta->is_dup = 0;
2628 lq_sta->max_rate_idx = -1;
2629 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2630 lq_sta->is_green = rs_use_green(priv, conf);
2631 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2632 lq_sta->active_rate_basic = priv->active_rate_basic;
2633 lq_sta->band = priv->band;
2634 /*
2635 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2636 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2637 */
2638 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2639 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2640 lq_sta->active_siso_rate &= ~((u16)0x2);
2641 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2642
2643 /* Same here */
2644 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2645 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2646 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2647 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2648
2649 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2650 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2651 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2652 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2653
2654 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2655 lq_sta->active_siso_rate,
2656 lq_sta->active_mimo2_rate,
2657 lq_sta->active_mimo3_rate);
2658
2659 /* These values will be overridden later */
2660 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2661 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2662
2663 /* as default allow aggregation for all tids */
2664 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2665 lq_sta->drv = priv;
2666
2667 /* Find highest tx rate supported by hardware and destination station */
2668 mask_bit = sta->supp_rates[sband->band];
2669 count = sband->n_bitrates;
2670 if (sband->band == IEEE80211_BAND_5GHZ) {
2671 count += IWL_FIRST_OFDM_RATE;
2672 start_rate = IWL_FIRST_OFDM_RATE;
2673 mask_bit <<= IWL_FIRST_OFDM_RATE;
2674 }
2675
2676 mask_bit = mask_bit & lq_sta->active_legacy_rate;
2677 lq_sta->last_txrate_idx = 4;
2678 for (i = start_rate; i < count; i++)
2679 if (mask_bit & BIT(i))
2680 lq_sta->last_txrate_idx = i;
2681
2682 rs_initialize_lq(priv, conf, sta, lq_sta);
2683 }
2684
2685 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2686 struct iwl_lq_sta *lq_sta, u32 new_rate)
2687 {
2688 struct iwl_scale_tbl_info tbl_type;
2689 int index = 0;
2690 int rate_idx;
2691 int repeat_rate = 0;
2692 u8 ant_toggle_cnt = 0;
2693 u8 use_ht_possible = 1;
2694 u8 valid_tx_ant = 0;
2695 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2696
2697 /* Override starting rate (index 0) if needed for debug purposes */
2698 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2699
2700 /* Interpret new_rate (rate_n_flags) */
2701 memset(&tbl_type, 0, sizeof(tbl_type));
2702 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2703 &tbl_type, &rate_idx);
2704
2705 /* How many times should we repeat the initial rate? */
2706 if (is_legacy(tbl_type.lq_type)) {
2707 ant_toggle_cnt = 1;
2708 repeat_rate = IWL_NUMBER_TRY;
2709 } else {
2710 repeat_rate = IWL_HT_NUMBER_TRY;
2711 }
2712
2713 lq_cmd->general_params.mimo_delimiter =
2714 is_mimo(tbl_type.lq_type) ? 1 : 0;
2715
2716 /* Fill 1st table entry (index 0) */
2717 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2718
2719 if (num_of_ant(tbl_type.ant_type) == 1) {
2720 lq_cmd->general_params.single_stream_ant_msk =
2721 tbl_type.ant_type;
2722 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2723 lq_cmd->general_params.dual_stream_ant_msk =
2724 tbl_type.ant_type;
2725 } /* otherwise we don't modify the existing value */
2726
2727 index++;
2728 repeat_rate--;
2729
2730 if (priv)
2731 valid_tx_ant = priv->hw_params.valid_tx_ant;
2732
2733 /* Fill rest of rate table */
2734 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2735 /* Repeat initial/next rate.
2736 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2737 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2738 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2739 if (is_legacy(tbl_type.lq_type)) {
2740 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2741 ant_toggle_cnt++;
2742 else if (priv &&
2743 rs_toggle_antenna(valid_tx_ant,
2744 &new_rate, &tbl_type))
2745 ant_toggle_cnt = 1;
2746 }
2747
2748 /* Override next rate if needed for debug purposes */
2749 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2750
2751 /* Fill next table entry */
2752 lq_cmd->rs_table[index].rate_n_flags =
2753 cpu_to_le32(new_rate);
2754 repeat_rate--;
2755 index++;
2756 }
2757
2758 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2759 &rate_idx);
2760
2761 /* Indicate to uCode which entries might be MIMO.
2762 * If initial rate was MIMO, this will finally end up
2763 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2764 if (is_mimo(tbl_type.lq_type))
2765 lq_cmd->general_params.mimo_delimiter = index;
2766
2767 /* Get next rate */
2768 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2769 use_ht_possible);
2770
2771 /* How many times should we repeat the next rate? */
2772 if (is_legacy(tbl_type.lq_type)) {
2773 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2774 ant_toggle_cnt++;
2775 else if (priv &&
2776 rs_toggle_antenna(valid_tx_ant,
2777 &new_rate, &tbl_type))
2778 ant_toggle_cnt = 1;
2779
2780 repeat_rate = IWL_NUMBER_TRY;
2781 } else {
2782 repeat_rate = IWL_HT_NUMBER_TRY;
2783 }
2784
2785 /* Don't allow HT rates after next pass.
2786 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2787 use_ht_possible = 0;
2788
2789 /* Override next rate if needed for debug purposes */
2790 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2791
2792 /* Fill next table entry */
2793 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2794
2795 index++;
2796 repeat_rate--;
2797 }
2798
2799 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_MAX;
2800 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2801 lq_cmd->agg_params.agg_time_limit =
2802 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2803 }
2804
2805 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2806 {
2807 return hw->priv;
2808 }
2809 /* rate scale requires free function to be implemented */
2810 static void rs_free(void *priv_rate)
2811 {
2812 return;
2813 }
2814
2815 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2816 void *priv_sta)
2817 {
2818 struct iwl_lq_sta *lq_sta = priv_sta;
2819 struct iwl_priv *priv __maybe_unused = priv_r;
2820
2821 IWL_DEBUG_RATE(priv, "enter\n");
2822 kfree(lq_sta);
2823 IWL_DEBUG_RATE(priv, "leave\n");
2824 }
2825
2826
2827 #ifdef CONFIG_MAC80211_DEBUGFS
2828 static int open_file_generic(struct inode *inode, struct file *file)
2829 {
2830 file->private_data = inode->i_private;
2831 return 0;
2832 }
2833 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2834 u32 *rate_n_flags, int index)
2835 {
2836 struct iwl_priv *priv;
2837 u8 valid_tx_ant;
2838 u8 ant_sel_tx;
2839
2840 priv = lq_sta->drv;
2841 valid_tx_ant = priv->hw_params.valid_tx_ant;
2842 if (lq_sta->dbg_fixed_rate) {
2843 ant_sel_tx =
2844 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2845 >> RATE_MCS_ANT_POS);
2846 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2847 *rate_n_flags = lq_sta->dbg_fixed_rate;
2848 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2849 } else {
2850 lq_sta->dbg_fixed_rate = 0;
2851 IWL_ERR(priv,
2852 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2853 ant_sel_tx, valid_tx_ant);
2854 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2855 }
2856 } else {
2857 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2858 }
2859 }
2860
2861 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2862 const char __user *user_buf, size_t count, loff_t *ppos)
2863 {
2864 struct iwl_lq_sta *lq_sta = file->private_data;
2865 struct iwl_priv *priv;
2866 char buf[64];
2867 int buf_size;
2868 u32 parsed_rate;
2869
2870 priv = lq_sta->drv;
2871 memset(buf, 0, sizeof(buf));
2872 buf_size = min(count, sizeof(buf) - 1);
2873 if (copy_from_user(buf, user_buf, buf_size))
2874 return -EFAULT;
2875
2876 if (sscanf(buf, "%x", &parsed_rate) == 1)
2877 lq_sta->dbg_fixed_rate = parsed_rate;
2878 else
2879 lq_sta->dbg_fixed_rate = 0;
2880
2881 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2882 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2883 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2884 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2885
2886 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2887 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2888
2889 if (lq_sta->dbg_fixed_rate) {
2890 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2891 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2892 }
2893
2894 return count;
2895 }
2896
2897 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2898 char __user *user_buf, size_t count, loff_t *ppos)
2899 {
2900 char *buff;
2901 int desc = 0;
2902 int i = 0;
2903 int index = 0;
2904 ssize_t ret;
2905
2906 struct iwl_lq_sta *lq_sta = file->private_data;
2907 struct iwl_priv *priv;
2908 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2909
2910 priv = lq_sta->drv;
2911 buff = kmalloc(1024, GFP_KERNEL);
2912 if (!buff)
2913 return -ENOMEM;
2914
2915 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2916 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2917 lq_sta->total_failed, lq_sta->total_success,
2918 lq_sta->active_legacy_rate);
2919 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2920 lq_sta->dbg_fixed_rate);
2921 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2922 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2923 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2924 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2925 desc += sprintf(buff+desc, "lq type %s\n",
2926 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2927 if (is_Ht(tbl->lq_type)) {
2928 desc += sprintf(buff+desc, " %s",
2929 (is_siso(tbl->lq_type)) ? "SISO" :
2930 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2931 desc += sprintf(buff+desc, " %s",
2932 (tbl->is_fat) ? "40MHz" : "20MHz");
2933 desc += sprintf(buff+desc, " %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2934 (lq_sta->is_green) ? "GF enabled" : "");
2935 }
2936 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2937 lq_sta->last_rate_n_flags);
2938 desc += sprintf(buff+desc, "general:"
2939 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2940 lq_sta->lq.general_params.flags,
2941 lq_sta->lq.general_params.mimo_delimiter,
2942 lq_sta->lq.general_params.single_stream_ant_msk,
2943 lq_sta->lq.general_params.dual_stream_ant_msk);
2944
2945 desc += sprintf(buff+desc, "agg:"
2946 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2947 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2948 lq_sta->lq.agg_params.agg_dis_start_th,
2949 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2950
2951 desc += sprintf(buff+desc,
2952 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2953 lq_sta->lq.general_params.start_rate_index[0],
2954 lq_sta->lq.general_params.start_rate_index[1],
2955 lq_sta->lq.general_params.start_rate_index[2],
2956 lq_sta->lq.general_params.start_rate_index[3]);
2957
2958 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2959 index = iwl_hwrate_to_plcp_idx(
2960 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2961 if (is_legacy(tbl->lq_type)) {
2962 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2963 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2964 iwl_rate_mcs[index].mbps);
2965 } else {
2966 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2967 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2968 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2969 }
2970 }
2971
2972 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2973 kfree(buff);
2974 return ret;
2975 }
2976
2977 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2978 .write = rs_sta_dbgfs_scale_table_write,
2979 .read = rs_sta_dbgfs_scale_table_read,
2980 .open = open_file_generic,
2981 };
2982 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2983 char __user *user_buf, size_t count, loff_t *ppos)
2984 {
2985 char *buff;
2986 int desc = 0;
2987 int i, j;
2988 ssize_t ret;
2989
2990 struct iwl_lq_sta *lq_sta = file->private_data;
2991
2992 buff = kmalloc(1024, GFP_KERNEL);
2993 if (!buff)
2994 return -ENOMEM;
2995
2996 for (i = 0; i < LQ_SIZE; i++) {
2997 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d GF=%d\n"
2998 "rate=0x%X\n",
2999 lq_sta->active_tbl == i ? "*" : "x",
3000 lq_sta->lq_info[i].lq_type,
3001 lq_sta->lq_info[i].is_SGI,
3002 lq_sta->lq_info[i].is_fat,
3003 lq_sta->lq_info[i].is_dup,
3004 lq_sta->is_green,
3005 lq_sta->lq_info[i].current_rate);
3006 for (j = 0; j < IWL_RATE_COUNT; j++) {
3007 desc += sprintf(buff+desc,
3008 "counter=%d success=%d %%=%d\n",
3009 lq_sta->lq_info[i].win[j].counter,
3010 lq_sta->lq_info[i].win[j].success_counter,
3011 lq_sta->lq_info[i].win[j].success_ratio);
3012 }
3013 }
3014 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3015 kfree(buff);
3016 return ret;
3017 }
3018
3019 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3020 .read = rs_sta_dbgfs_stats_table_read,
3021 .open = open_file_generic,
3022 };
3023
3024 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3025 char __user *user_buf, size_t count, loff_t *ppos)
3026 {
3027 char buff[120];
3028 int desc = 0;
3029 ssize_t ret;
3030
3031 struct iwl_lq_sta *lq_sta = file->private_data;
3032 struct iwl_priv *priv;
3033 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3034
3035 priv = lq_sta->drv;
3036
3037 if (is_Ht(tbl->lq_type))
3038 desc += sprintf(buff+desc,
3039 "Bit Rate= %d Mb/s\n",
3040 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3041 else
3042 desc += sprintf(buff+desc,
3043 "Bit Rate= %d Mb/s\n",
3044 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3045 desc += sprintf(buff+desc,
3046 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3047 priv->last_rx_rssi, priv->last_rx_noise);
3048 desc += sprintf(buff+desc,
3049 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3050 priv->last_tsf, priv->last_beacon_time);
3051
3052 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3053 return ret;
3054 }
3055
3056 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3057 .read = rs_sta_dbgfs_rate_scale_data_read,
3058 .open = open_file_generic,
3059 };
3060
3061 static void rs_add_debugfs(void *priv, void *priv_sta,
3062 struct dentry *dir)
3063 {
3064 struct iwl_lq_sta *lq_sta = priv_sta;
3065 lq_sta->rs_sta_dbgfs_scale_table_file =
3066 debugfs_create_file("rate_scale_table", 0600, dir,
3067 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3068 lq_sta->rs_sta_dbgfs_stats_table_file =
3069 debugfs_create_file("rate_stats_table", 0600, dir,
3070 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3071 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3072 debugfs_create_file("rate_scale_data", 0600, dir,
3073 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3074 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3075 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3076 &lq_sta->tx_agg_tid_en);
3077
3078 }
3079
3080 static void rs_remove_debugfs(void *priv, void *priv_sta)
3081 {
3082 struct iwl_lq_sta *lq_sta = priv_sta;
3083 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3084 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3085 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3086 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3087 }
3088 #endif
3089
3090 static struct rate_control_ops rs_ops = {
3091 .module = NULL,
3092 .name = RS_NAME,
3093 .tx_status = rs_tx_status,
3094 .get_rate = rs_get_rate,
3095 .rate_init = rs_rate_init,
3096 .alloc = rs_alloc,
3097 .free = rs_free,
3098 .alloc_sta = rs_alloc_sta,
3099 .free_sta = rs_free_sta,
3100 #ifdef CONFIG_MAC80211_DEBUGFS
3101 .add_sta_debugfs = rs_add_debugfs,
3102 .remove_sta_debugfs = rs_remove_debugfs,
3103 #endif
3104 };
3105
3106 int iwlagn_rate_control_register(void)
3107 {
3108 return ieee80211_rate_control_register(&rs_ops);
3109 }
3110
3111 void iwlagn_rate_control_unregister(void)
3112 {
3113 ieee80211_rate_control_unregister(&rs_ops);
3114 }
3115
3116
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