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iwlagn: show current rate scale data in debugfs
[firewire-audio.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob4c88e8715df25487ddf0cf4cc256d68ec000d695
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 static inline u8 rs_extract_rate(u32 rate_n_flags)
274 {
275 return (u8)(rate_n_flags & 0xFF);
276 }
277
278 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
279 {
280 window->data = 0;
281 window->success_counter = 0;
282 window->success_ratio = IWL_INVALID_VALUE;
283 window->counter = 0;
284 window->average_tpt = IWL_INVALID_VALUE;
285 window->stamp = 0;
286 }
287
288 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
289 {
290 return (ant_type & valid_antenna) == ant_type;
291 }
292
293 /*
294 * removes the old data from the statistics. All data that is older than
295 * TID_MAX_TIME_DIFF, will be deleted.
296 */
297 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
298 {
299 /* The oldest age we want to keep */
300 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
301
302 while (tl->queue_count &&
303 (tl->time_stamp < oldest_time)) {
304 tl->total -= tl->packet_count[tl->head];
305 tl->packet_count[tl->head] = 0;
306 tl->time_stamp += TID_QUEUE_CELL_SPACING;
307 tl->queue_count--;
308 tl->head++;
309 if (tl->head >= TID_QUEUE_MAX_SIZE)
310 tl->head = 0;
311 }
312 }
313
314 /*
315 * increment traffic load value for tid and also remove
316 * any old values if passed the certain time period
317 */
318 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
319 struct ieee80211_hdr *hdr)
320 {
321 u32 curr_time = jiffies_to_msecs(jiffies);
322 u32 time_diff;
323 s32 index;
324 struct iwl_traffic_load *tl = NULL;
325 u8 tid;
326
327 if (ieee80211_is_data_qos(hdr->frame_control)) {
328 u8 *qc = ieee80211_get_qos_ctl(hdr);
329 tid = qc[0] & 0xf;
330 } else
331 return MAX_TID_COUNT;
332
333 tl = &lq_data->load[tid];
334
335 curr_time -= curr_time % TID_ROUND_VALUE;
336
337 /* Happens only for the first packet. Initialize the data */
338 if (!(tl->queue_count)) {
339 tl->total = 1;
340 tl->time_stamp = curr_time;
341 tl->queue_count = 1;
342 tl->head = 0;
343 tl->packet_count[0] = 1;
344 return MAX_TID_COUNT;
345 }
346
347 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
348 index = time_diff / TID_QUEUE_CELL_SPACING;
349
350 /* The history is too long: remove data that is older than */
351 /* TID_MAX_TIME_DIFF */
352 if (index >= TID_QUEUE_MAX_SIZE)
353 rs_tl_rm_old_stats(tl, curr_time);
354
355 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
356 tl->packet_count[index] = tl->packet_count[index] + 1;
357 tl->total = tl->total + 1;
358
359 if ((index + 1) > tl->queue_count)
360 tl->queue_count = index + 1;
361
362 return tid;
363 }
364
365 /*
366 get the traffic load value for tid
367 */
368 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
369 {
370 u32 curr_time = jiffies_to_msecs(jiffies);
371 u32 time_diff;
372 s32 index;
373 struct iwl_traffic_load *tl = NULL;
374
375 if (tid >= TID_MAX_LOAD_COUNT)
376 return 0;
377
378 tl = &(lq_data->load[tid]);
379
380 curr_time -= curr_time % TID_ROUND_VALUE;
381
382 if (!(tl->queue_count))
383 return 0;
384
385 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
386 index = time_diff / TID_QUEUE_CELL_SPACING;
387
388 /* The history is too long: remove data that is older than */
389 /* TID_MAX_TIME_DIFF */
390 if (index >= TID_QUEUE_MAX_SIZE)
391 rs_tl_rm_old_stats(tl, curr_time);
392
393 return tl->total;
394 }
395
396 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
397 struct iwl_lq_sta *lq_data, u8 tid,
398 struct ieee80211_sta *sta)
399 {
400 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
401 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
402 sta->addr, tid);
403 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
404 }
405 }
406
407 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
408 struct iwl_lq_sta *lq_data,
409 struct ieee80211_sta *sta)
410 {
411 if ((tid < TID_MAX_LOAD_COUNT))
412 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
413 else if (tid == IWL_AGG_ALL_TID)
414 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
415 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
416 }
417
418 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
419 {
420 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
421 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
422 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
423 }
424
425 /**
426 * rs_collect_tx_data - Update the success/failure sliding window
427 *
428 * We keep a sliding window of the last 62 packets transmitted
429 * at this rate. window->data contains the bitmask of successful
430 * packets.
431 */
432 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
433 int scale_index, s32 tpt, int retries,
434 int successes)
435 {
436 struct iwl_rate_scale_data *window = NULL;
437 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
438 s32 fail_count;
439
440 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
441 return -EINVAL;
442
443 /* Select data for current tx bit rate */
444 window = &(windows[scale_index]);
445
446 /*
447 * Keep track of only the latest 62 tx frame attempts in this rate's
448 * history window; anything older isn't really relevant any more.
449 * If we have filled up the sliding window, drop the oldest attempt;
450 * if the oldest attempt (highest bit in bitmap) shows "success",
451 * subtract "1" from the success counter (this is the main reason
452 * we keep these bitmaps!).
453 */
454 while (retries > 0) {
455 if (window->counter >= IWL_RATE_MAX_WINDOW) {
456
457 /* remove earliest */
458 window->counter = IWL_RATE_MAX_WINDOW - 1;
459
460 if (window->data & mask) {
461 window->data &= ~mask;
462 window->success_counter--;
463 }
464 }
465
466 /* Increment frames-attempted counter */
467 window->counter++;
468
469 /* Shift bitmap by one frame (throw away oldest history),
470 * OR in "1", and increment "success" if this
471 * frame was successful. */
472 window->data <<= 1;
473 if (successes > 0) {
474 window->success_counter++;
475 window->data |= 0x1;
476 successes--;
477 }
478
479 retries--;
480 }
481
482 /* Calculate current success ratio, avoid divide-by-0! */
483 if (window->counter > 0)
484 window->success_ratio = 128 * (100 * window->success_counter)
485 / window->counter;
486 else
487 window->success_ratio = IWL_INVALID_VALUE;
488
489 fail_count = window->counter - window->success_counter;
490
491 /* Calculate average throughput, if we have enough history. */
492 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
493 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
494 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
495 else
496 window->average_tpt = IWL_INVALID_VALUE;
497
498 /* Tag this window as having been updated */
499 window->stamp = jiffies;
500
501 return 0;
502 }
503
504 /*
505 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
506 */
507 /* FIXME:RS:remove this function and put the flags statically in the table */
508 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
509 struct iwl_scale_tbl_info *tbl,
510 int index, u8 use_green)
511 {
512 u32 rate_n_flags = 0;
513
514 if (is_legacy(tbl->lq_type)) {
515 rate_n_flags = iwl_rates[index].plcp;
516 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
517 rate_n_flags |= RATE_MCS_CCK_MSK;
518
519 } else if (is_Ht(tbl->lq_type)) {
520 if (index > IWL_LAST_OFDM_RATE) {
521 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
522 index = IWL_LAST_OFDM_RATE;
523 }
524 rate_n_flags = RATE_MCS_HT_MSK;
525
526 if (is_siso(tbl->lq_type))
527 rate_n_flags |= iwl_rates[index].plcp_siso;
528 else if (is_mimo2(tbl->lq_type))
529 rate_n_flags |= iwl_rates[index].plcp_mimo2;
530 else
531 rate_n_flags |= iwl_rates[index].plcp_mimo3;
532 } else {
533 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
534 }
535
536 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
537 RATE_MCS_ANT_ABC_MSK);
538
539 if (is_Ht(tbl->lq_type)) {
540 if (tbl->is_fat) {
541 if (tbl->is_dup)
542 rate_n_flags |= RATE_MCS_DUP_MSK;
543 else
544 rate_n_flags |= RATE_MCS_FAT_MSK;
545 }
546 if (tbl->is_SGI)
547 rate_n_flags |= RATE_MCS_SGI_MSK;
548
549 if (use_green) {
550 rate_n_flags |= RATE_MCS_GF_MSK;
551 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
552 rate_n_flags &= ~RATE_MCS_SGI_MSK;
553 IWL_ERR(priv, "GF was set with SGI:SISO\n");
554 }
555 }
556 }
557 return rate_n_flags;
558 }
559
560 /*
561 * Interpret uCode API's rate_n_flags format,
562 * fill "search" or "active" tx mode table.
563 */
564 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
565 enum ieee80211_band band,
566 struct iwl_scale_tbl_info *tbl,
567 int *rate_idx)
568 {
569 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
570 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
571 u8 mcs;
572
573 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
574
575 if (*rate_idx == IWL_RATE_INVALID) {
576 *rate_idx = -1;
577 return -EINVAL;
578 }
579 tbl->is_SGI = 0; /* default legacy setup */
580 tbl->is_fat = 0;
581 tbl->is_dup = 0;
582 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
583 tbl->lq_type = LQ_NONE;
584 tbl->max_search = IWL_MAX_SEARCH;
585
586 /* legacy rate format */
587 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
588 if (num_of_ant == 1) {
589 if (band == IEEE80211_BAND_5GHZ)
590 tbl->lq_type = LQ_A;
591 else
592 tbl->lq_type = LQ_G;
593 }
594 /* HT rate format */
595 } else {
596 if (rate_n_flags & RATE_MCS_SGI_MSK)
597 tbl->is_SGI = 1;
598
599 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
600 (rate_n_flags & RATE_MCS_DUP_MSK))
601 tbl->is_fat = 1;
602
603 if (rate_n_flags & RATE_MCS_DUP_MSK)
604 tbl->is_dup = 1;
605
606 mcs = rs_extract_rate(rate_n_flags);
607
608 /* SISO */
609 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
610 if (num_of_ant == 1)
611 tbl->lq_type = LQ_SISO; /*else NONE*/
612 /* MIMO2 */
613 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
614 if (num_of_ant == 2)
615 tbl->lq_type = LQ_MIMO2;
616 /* MIMO3 */
617 } else {
618 if (num_of_ant == 3) {
619 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
620 tbl->lq_type = LQ_MIMO3;
621 }
622 }
623 }
624 return 0;
625 }
626
627 /* switch to another antenna/antennas and return 1 */
628 /* if no other valid antenna found, return 0 */
629 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
630 struct iwl_scale_tbl_info *tbl)
631 {
632 u8 new_ant_type;
633
634 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
635 return 0;
636
637 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
638 return 0;
639
640 new_ant_type = ant_toggle_lookup[tbl->ant_type];
641
642 while ((new_ant_type != tbl->ant_type) &&
643 !rs_is_valid_ant(valid_ant, new_ant_type))
644 new_ant_type = ant_toggle_lookup[new_ant_type];
645
646 if (new_ant_type == tbl->ant_type)
647 return 0;
648
649 tbl->ant_type = new_ant_type;
650 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
651 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
652 return 1;
653 }
654
655 /* FIXME:RS: in 4965 we don't use greenfield at all */
656 /* FIXME:RS: don't use greenfield for now in TX */
657 #if 0
658 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
659 {
660 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
661 priv->current_ht_config.is_green_field &&
662 !priv->current_ht_config.non_GF_STA_present;
663 }
664 #endif
665 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
666 {
667 return 0;
668 }
669
670 /**
671 * rs_get_supported_rates - get the available rates
672 *
673 * if management frame or broadcast frame only return
674 * basic available rates.
675 *
676 */
677 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
678 struct ieee80211_hdr *hdr,
679 enum iwl_table_type rate_type)
680 {
681 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
682 lq_sta->active_rate_basic)
683 return lq_sta->active_rate_basic;
684
685 if (is_legacy(rate_type)) {
686 return lq_sta->active_legacy_rate;
687 } else {
688 if (is_siso(rate_type))
689 return lq_sta->active_siso_rate;
690 else if (is_mimo2(rate_type))
691 return lq_sta->active_mimo2_rate;
692 else
693 return lq_sta->active_mimo3_rate;
694 }
695 }
696
697 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
698 int rate_type)
699 {
700 u8 high = IWL_RATE_INVALID;
701 u8 low = IWL_RATE_INVALID;
702
703 /* 802.11A or ht walks to the next literal adjacent rate in
704 * the rate table */
705 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
706 int i;
707 u32 mask;
708
709 /* Find the previous rate that is in the rate mask */
710 i = index - 1;
711 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
712 if (rate_mask & mask) {
713 low = i;
714 break;
715 }
716 }
717
718 /* Find the next rate that is in the rate mask */
719 i = index + 1;
720 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
721 if (rate_mask & mask) {
722 high = i;
723 break;
724 }
725 }
726
727 return (high << 8) | low;
728 }
729
730 low = index;
731 while (low != IWL_RATE_INVALID) {
732 low = iwl_rates[low].prev_rs;
733 if (low == IWL_RATE_INVALID)
734 break;
735 if (rate_mask & (1 << low))
736 break;
737 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
738 }
739
740 high = index;
741 while (high != IWL_RATE_INVALID) {
742 high = iwl_rates[high].next_rs;
743 if (high == IWL_RATE_INVALID)
744 break;
745 if (rate_mask & (1 << high))
746 break;
747 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
748 }
749
750 return (high << 8) | low;
751 }
752
753 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
754 struct iwl_scale_tbl_info *tbl,
755 u8 scale_index, u8 ht_possible)
756 {
757 s32 low;
758 u16 rate_mask;
759 u16 high_low;
760 u8 switch_to_legacy = 0;
761 u8 is_green = lq_sta->is_green;
762
763 /* check if we need to switch from HT to legacy rates.
764 * assumption is that mandatory rates (1Mbps or 6Mbps)
765 * are always supported (spec demand) */
766 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
767 switch_to_legacy = 1;
768 scale_index = rs_ht_to_legacy[scale_index];
769 if (lq_sta->band == IEEE80211_BAND_5GHZ)
770 tbl->lq_type = LQ_A;
771 else
772 tbl->lq_type = LQ_G;
773
774 if (num_of_ant(tbl->ant_type) > 1)
775 tbl->ant_type = ANT_A;/*FIXME:RS*/
776
777 tbl->is_fat = 0;
778 tbl->is_SGI = 0;
779 tbl->max_search = IWL_MAX_SEARCH;
780 }
781
782 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
783
784 /* Mask with station rate restriction */
785 if (is_legacy(tbl->lq_type)) {
786 /* supp_rates has no CCK bits in A mode */
787 if (lq_sta->band == IEEE80211_BAND_5GHZ)
788 rate_mask = (u16)(rate_mask &
789 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
790 else
791 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
792 }
793
794 /* If we switched from HT to legacy, check current rate */
795 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
796 low = scale_index;
797 goto out;
798 }
799
800 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
801 tbl->lq_type);
802 low = high_low & 0xff;
803
804 if (low == IWL_RATE_INVALID)
805 low = scale_index;
806
807 out:
808 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
809 }
810
811 /*
812 * mac80211 sends us Tx status
813 */
814 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
815 struct ieee80211_sta *sta, void *priv_sta,
816 struct sk_buff *skb)
817 {
818 int status;
819 u8 retries;
820 int rs_index, index = 0;
821 struct iwl_lq_sta *lq_sta = priv_sta;
822 struct iwl_link_quality_cmd *table;
823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
824 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
825 struct ieee80211_hw *hw = priv->hw;
826 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
827 struct iwl_rate_scale_data *window = NULL;
828 struct iwl_rate_scale_data *search_win = NULL;
829 u32 tx_rate;
830 struct iwl_scale_tbl_info tbl_type;
831 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
832 u8 active_index = 0;
833 s32 tpt = 0;
834
835 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
836
837 if (!ieee80211_is_data(hdr->frame_control) ||
838 info->flags & IEEE80211_TX_CTL_NO_ACK)
839 return;
840
841 /* This packet was aggregated but doesn't carry rate scale info */
842 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
843 !(info->flags & IEEE80211_TX_STAT_AMPDU))
844 return;
845
846 if (info->flags & IEEE80211_TX_STAT_AMPDU)
847 retries = 0;
848 else
849 retries = info->status.rates[0].count - 1;
850
851 if (retries > 15)
852 retries = 15;
853
854 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
855 !lq_sta->ibss_sta_added)
856 goto out;
857
858 table = &lq_sta->lq;
859 active_index = lq_sta->active_tbl;
860
861 curr_tbl = &(lq_sta->lq_info[active_index]);
862 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
863 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
864 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
865
866 /*
867 * Ignore this Tx frame response if its initial rate doesn't match
868 * that of latest Link Quality command. There may be stragglers
869 * from a previous Link Quality command, but we're no longer interested
870 * in those; they're either from the "active" mode while we're trying
871 * to check "search" mode, or a prior "search" mode after we've moved
872 * to a new "search" mode (which might become the new "active" mode).
873 */
874 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
875 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
876 if (priv->band == IEEE80211_BAND_5GHZ)
877 rs_index -= IWL_FIRST_OFDM_RATE;
878
879 if ((info->status.rates[0].idx < 0) ||
880 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
881 (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
882 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
883 (tbl_type.ant_type != info->antenna_sel_tx) ||
884 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
885 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
886 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
887 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
888 IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate);
889 /* the last LQ command could failed so the LQ in ucode not
890 * the same in driver sync up
891 */
892 lq_sta->missed_rate_counter++;
893 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
894 lq_sta->missed_rate_counter = 0;
895 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
896 }
897 goto out;
898 }
899
900 lq_sta->missed_rate_counter = 0;
901 /* Update frame history window with "failure" for each Tx retry. */
902 while (retries) {
903 /* Look up the rate and other info used for each tx attempt.
904 * Each tx attempt steps one entry deeper in the rate table. */
905 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
906 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
907 &tbl_type, &rs_index);
908
909 /* If type matches "search" table,
910 * add failure to "search" history */
911 if ((tbl_type.lq_type == search_tbl->lq_type) &&
912 (tbl_type.ant_type == search_tbl->ant_type) &&
913 (tbl_type.is_SGI == search_tbl->is_SGI)) {
914 if (search_tbl->expected_tpt)
915 tpt = search_tbl->expected_tpt[rs_index];
916 else
917 tpt = 0;
918 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
919
920 /* Else if type matches "current/active" table,
921 * add failure to "current/active" history */
922 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
923 (tbl_type.ant_type == curr_tbl->ant_type) &&
924 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
925 if (curr_tbl->expected_tpt)
926 tpt = curr_tbl->expected_tpt[rs_index];
927 else
928 tpt = 0;
929 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
930 }
931
932 /* If not searching for a new mode, increment failed counter
933 * ... this helps determine when to start searching again */
934 if (lq_sta->stay_in_tbl)
935 lq_sta->total_failed++;
936 --retries;
937 index++;
938
939 }
940
941 /*
942 * Find (by rate) the history window to update with final Tx attempt;
943 * if Tx was successful first try, use original rate,
944 * else look up the rate that was, finally, successful.
945 */
946 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
947 lq_sta->last_rate_n_flags = tx_rate;
948 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
949
950 /* Update frame history window with "success" if Tx got ACKed ... */
951 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
952
953 /* If type matches "search" table,
954 * add final tx status to "search" history */
955 if ((tbl_type.lq_type == search_tbl->lq_type) &&
956 (tbl_type.ant_type == search_tbl->ant_type) &&
957 (tbl_type.is_SGI == search_tbl->is_SGI)) {
958 if (search_tbl->expected_tpt)
959 tpt = search_tbl->expected_tpt[rs_index];
960 else
961 tpt = 0;
962 if (info->flags & IEEE80211_TX_STAT_AMPDU)
963 rs_collect_tx_data(search_win, rs_index, tpt,
964 info->status.ampdu_ack_len,
965 info->status.ampdu_ack_map);
966 else
967 rs_collect_tx_data(search_win, rs_index, tpt,
968 1, status);
969 /* Else if type matches "current/active" table,
970 * add final tx status to "current/active" history */
971 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
972 (tbl_type.ant_type == curr_tbl->ant_type) &&
973 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
974 if (curr_tbl->expected_tpt)
975 tpt = curr_tbl->expected_tpt[rs_index];
976 else
977 tpt = 0;
978 if (info->flags & IEEE80211_TX_STAT_AMPDU)
979 rs_collect_tx_data(window, rs_index, tpt,
980 info->status.ampdu_ack_len,
981 info->status.ampdu_ack_map);
982 else
983 rs_collect_tx_data(window, rs_index, tpt,
984 1, status);
985 }
986
987 /* If not searching for new mode, increment success/failed counter
988 * ... these help determine when to start searching again */
989 if (lq_sta->stay_in_tbl) {
990 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
991 lq_sta->total_success += info->status.ampdu_ack_map;
992 lq_sta->total_failed +=
993 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
994 } else {
995 if (status)
996 lq_sta->total_success++;
997 else
998 lq_sta->total_failed++;
999 }
1000 }
1001
1002 /* See if there's a better rate or modulation mode to try. */
1003 if (sta && sta->supp_rates[sband->band])
1004 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1005 out:
1006 return;
1007 }
1008
1009 /*
1010 * Begin a period of staying with a selected modulation mode.
1011 * Set "stay_in_tbl" flag to prevent any mode switches.
1012 * Set frame tx success limits according to legacy vs. high-throughput,
1013 * and reset overall (spanning all rates) tx success history statistics.
1014 * These control how long we stay using same modulation mode before
1015 * searching for a new mode.
1016 */
1017 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1018 struct iwl_lq_sta *lq_sta)
1019 {
1020 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1021 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1022 if (is_legacy) {
1023 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1024 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1025 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1026 } else {
1027 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1028 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1029 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1030 }
1031 lq_sta->table_count = 0;
1032 lq_sta->total_failed = 0;
1033 lq_sta->total_success = 0;
1034 lq_sta->flush_timer = jiffies;
1035 lq_sta->action_counter = 0;
1036 }
1037
1038 /*
1039 * Find correct throughput table for given mode of modulation
1040 */
1041 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1042 struct iwl_scale_tbl_info *tbl)
1043 {
1044 if (is_legacy(tbl->lq_type)) {
1045 if (!is_a_band(tbl->lq_type))
1046 tbl->expected_tpt = expected_tpt_G;
1047 else
1048 tbl->expected_tpt = expected_tpt_A;
1049 } else if (is_siso(tbl->lq_type)) {
1050 if (tbl->is_fat && !lq_sta->is_dup)
1051 if (tbl->is_SGI)
1052 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1053 else
1054 tbl->expected_tpt = expected_tpt_siso40MHz;
1055 else if (tbl->is_SGI)
1056 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1057 else
1058 tbl->expected_tpt = expected_tpt_siso20MHz;
1059 } else if (is_mimo2(tbl->lq_type)) {
1060 if (tbl->is_fat && !lq_sta->is_dup)
1061 if (tbl->is_SGI)
1062 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1063 else
1064 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1065 else if (tbl->is_SGI)
1066 tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1067 else
1068 tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1069 } else if (is_mimo3(tbl->lq_type)) {
1070 if (tbl->is_fat && !lq_sta->is_dup)
1071 if (tbl->is_SGI)
1072 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
1073 else
1074 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
1075 else if (tbl->is_SGI)
1076 tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
1077 else
1078 tbl->expected_tpt = expected_tpt_mimo3_20MHz;
1079 } else
1080 tbl->expected_tpt = expected_tpt_G;
1081 }
1082
1083 /*
1084 * Find starting rate for new "search" high-throughput mode of modulation.
1085 * Goal is to find lowest expected rate (under perfect conditions) that is
1086 * above the current measured throughput of "active" mode, to give new mode
1087 * a fair chance to prove itself without too many challenges.
1088 *
1089 * This gets called when transitioning to more aggressive modulation
1090 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1091 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1092 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1093 * bit rate will typically need to increase, but not if performance was bad.
1094 */
1095 static s32 rs_get_best_rate(struct iwl_priv *priv,
1096 struct iwl_lq_sta *lq_sta,
1097 struct iwl_scale_tbl_info *tbl, /* "search" */
1098 u16 rate_mask, s8 index)
1099 {
1100 /* "active" values */
1101 struct iwl_scale_tbl_info *active_tbl =
1102 &(lq_sta->lq_info[lq_sta->active_tbl]);
1103 s32 active_sr = active_tbl->win[index].success_ratio;
1104 s32 active_tpt = active_tbl->expected_tpt[index];
1105
1106 /* expected "search" throughput */
1107 s32 *tpt_tbl = tbl->expected_tpt;
1108
1109 s32 new_rate, high, low, start_hi;
1110 u16 high_low;
1111 s8 rate = index;
1112
1113 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1114
1115 for (; ;) {
1116 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1117 tbl->lq_type);
1118
1119 low = high_low & 0xff;
1120 high = (high_low >> 8) & 0xff;
1121
1122 /*
1123 * Lower the "search" bit rate, to give new "search" mode
1124 * approximately the same throughput as "active" if:
1125 *
1126 * 1) "Active" mode has been working modestly well (but not
1127 * great), and expected "search" throughput (under perfect
1128 * conditions) at candidate rate is above the actual
1129 * measured "active" throughput (but less than expected
1130 * "active" throughput under perfect conditions).
1131 * OR
1132 * 2) "Active" mode has been working perfectly or very well
1133 * and expected "search" throughput (under perfect
1134 * conditions) at candidate rate is above expected
1135 * "active" throughput (under perfect conditions).
1136 */
1137 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1138 ((active_sr > IWL_RATE_DECREASE_TH) &&
1139 (active_sr <= IWL_RATE_HIGH_TH) &&
1140 (tpt_tbl[rate] <= active_tpt))) ||
1141 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1142 (tpt_tbl[rate] > active_tpt))) {
1143
1144 /* (2nd or later pass)
1145 * If we've already tried to raise the rate, and are
1146 * now trying to lower it, use the higher rate. */
1147 if (start_hi != IWL_RATE_INVALID) {
1148 new_rate = start_hi;
1149 break;
1150 }
1151
1152 new_rate = rate;
1153
1154 /* Loop again with lower rate */
1155 if (low != IWL_RATE_INVALID)
1156 rate = low;
1157
1158 /* Lower rate not available, use the original */
1159 else
1160 break;
1161
1162 /* Else try to raise the "search" rate to match "active" */
1163 } else {
1164 /* (2nd or later pass)
1165 * If we've already tried to lower the rate, and are
1166 * now trying to raise it, use the lower rate. */
1167 if (new_rate != IWL_RATE_INVALID)
1168 break;
1169
1170 /* Loop again with higher rate */
1171 else if (high != IWL_RATE_INVALID) {
1172 start_hi = high;
1173 rate = high;
1174
1175 /* Higher rate not available, use the original */
1176 } else {
1177 new_rate = rate;
1178 break;
1179 }
1180 }
1181 }
1182
1183 return new_rate;
1184 }
1185
1186 /*
1187 * Set up search table for MIMO2
1188 */
1189 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1190 struct iwl_lq_sta *lq_sta,
1191 struct ieee80211_conf *conf,
1192 struct ieee80211_sta *sta,
1193 struct iwl_scale_tbl_info *tbl, int index)
1194 {
1195 u16 rate_mask;
1196 s32 rate;
1197 s8 is_green = lq_sta->is_green;
1198
1199 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1200 return -1;
1201
1202 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1203 == WLAN_HT_CAP_SM_PS_STATIC)
1204 return -1;
1205
1206 /* Need both Tx chains/antennas to support MIMO */
1207 if (priv->hw_params.tx_chains_num < 2)
1208 return -1;
1209
1210 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1211
1212 tbl->lq_type = LQ_MIMO2;
1213 tbl->is_dup = lq_sta->is_dup;
1214 tbl->action = 0;
1215 tbl->max_search = IWL_MAX_SEARCH;
1216 rate_mask = lq_sta->active_mimo2_rate;
1217
1218 if (iwl_is_fat_tx_allowed(priv, &sta->ht_cap))
1219 tbl->is_fat = 1;
1220 else
1221 tbl->is_fat = 0;
1222
1223 /* FIXME: - don't toggle SGI here
1224 if (tbl->is_fat) {
1225 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1226 tbl->is_SGI = 1;
1227 else
1228 tbl->is_SGI = 0;
1229 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1230 tbl->is_SGI = 1;
1231 else
1232 tbl->is_SGI = 0;
1233 */
1234
1235 rs_set_expected_tpt_table(lq_sta, tbl);
1236
1237 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1238
1239 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1240 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1241 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1242 rate, rate_mask);
1243 return -1;
1244 }
1245 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1246
1247 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1248 tbl->current_rate, is_green);
1249 return 0;
1250 }
1251
1252 /*
1253 * Set up search table for MIMO3
1254 */
1255 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1256 struct iwl_lq_sta *lq_sta,
1257 struct ieee80211_conf *conf,
1258 struct ieee80211_sta *sta,
1259 struct iwl_scale_tbl_info *tbl, int index)
1260 {
1261 u16 rate_mask;
1262 s32 rate;
1263 s8 is_green = lq_sta->is_green;
1264
1265 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1266 return -1;
1267
1268 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1269 == WLAN_HT_CAP_SM_PS_STATIC)
1270 return -1;
1271
1272 /* Need both Tx chains/antennas to support MIMO */
1273 if (priv->hw_params.tx_chains_num < 3)
1274 return -1;
1275
1276 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1277
1278 tbl->lq_type = LQ_MIMO3;
1279 tbl->is_dup = lq_sta->is_dup;
1280 tbl->action = 0;
1281 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1282 rate_mask = lq_sta->active_mimo3_rate;
1283
1284 if (iwl_is_fat_tx_allowed(priv, &sta->ht_cap))
1285 tbl->is_fat = 1;
1286 else
1287 tbl->is_fat = 0;
1288
1289 /* FIXME: - don't toggle SGI here
1290 if (tbl->is_fat) {
1291 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1292 tbl->is_SGI = 1;
1293 else
1294 tbl->is_SGI = 0;
1295 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1296 tbl->is_SGI = 1;
1297 else
1298 tbl->is_SGI = 0;
1299 */
1300
1301 rs_set_expected_tpt_table(lq_sta, tbl);
1302
1303 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1304
1305 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1306 rate, rate_mask);
1307 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1308 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1309 rate, rate_mask);
1310 return -1;
1311 }
1312 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1313
1314 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1315 tbl->current_rate, is_green);
1316 return 0;
1317 }
1318
1319 /*
1320 * Set up search table for SISO
1321 */
1322 static int rs_switch_to_siso(struct iwl_priv *priv,
1323 struct iwl_lq_sta *lq_sta,
1324 struct ieee80211_conf *conf,
1325 struct ieee80211_sta *sta,
1326 struct iwl_scale_tbl_info *tbl, int index)
1327 {
1328 u16 rate_mask;
1329 u8 is_green = lq_sta->is_green;
1330 s32 rate;
1331
1332 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1333 return -1;
1334
1335 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1336
1337 tbl->is_dup = lq_sta->is_dup;
1338 tbl->lq_type = LQ_SISO;
1339 tbl->action = 0;
1340 tbl->max_search = IWL_MAX_SEARCH;
1341 rate_mask = lq_sta->active_siso_rate;
1342
1343 if (iwl_is_fat_tx_allowed(priv, &sta->ht_cap))
1344 tbl->is_fat = 1;
1345 else
1346 tbl->is_fat = 0;
1347
1348 /* FIXME: - don't toggle SGI here
1349 if (tbl->is_fat) {
1350 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1351 tbl->is_SGI = 1;
1352 else
1353 tbl->is_SGI = 0;
1354 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1355 tbl->is_SGI = 1;
1356 else
1357 tbl->is_SGI = 0;
1358 */
1359
1360 if (is_green)
1361 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1362
1363 rs_set_expected_tpt_table(lq_sta, tbl);
1364 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1365
1366 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1367 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1368 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1369 rate, rate_mask);
1370 return -1;
1371 }
1372 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1373 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1374 tbl->current_rate, is_green);
1375 return 0;
1376 }
1377
1378 /*
1379 * Try to switch to new modulation mode from legacy
1380 */
1381 static int rs_move_legacy_other(struct iwl_priv *priv,
1382 struct iwl_lq_sta *lq_sta,
1383 struct ieee80211_conf *conf,
1384 struct ieee80211_sta *sta,
1385 int index)
1386 {
1387 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1388 struct iwl_scale_tbl_info *search_tbl =
1389 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1390 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1391 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1392 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1393 u8 start_action = tbl->action;
1394 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1395 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1396 int ret = 0;
1397 u8 update_search_tbl_counter = 0;
1398
1399 for (; ;) {
1400 lq_sta->action_counter++;
1401 switch (tbl->action) {
1402 case IWL_LEGACY_SWITCH_ANTENNA1:
1403 case IWL_LEGACY_SWITCH_ANTENNA2:
1404 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1405
1406 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1407 tx_chains_num <= 1) ||
1408 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1409 tx_chains_num <= 2))
1410 break;
1411
1412 /* Don't change antenna if success has been great */
1413 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1414 break;
1415
1416 /* Set up search table to try other antenna */
1417 memcpy(search_tbl, tbl, sz);
1418
1419 if (rs_toggle_antenna(valid_tx_ant,
1420 &search_tbl->current_rate, search_tbl)) {
1421 update_search_tbl_counter = 1;
1422 rs_set_expected_tpt_table(lq_sta, search_tbl);
1423 goto out;
1424 }
1425 break;
1426 case IWL_LEGACY_SWITCH_SISO:
1427 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1428
1429 /* Set up search table to try SISO */
1430 memcpy(search_tbl, tbl, sz);
1431 search_tbl->is_SGI = 0;
1432 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1433 search_tbl, index);
1434 if (!ret) {
1435 lq_sta->action_counter = 0;
1436 goto out;
1437 }
1438
1439 break;
1440 case IWL_LEGACY_SWITCH_MIMO2_AB:
1441 case IWL_LEGACY_SWITCH_MIMO2_AC:
1442 case IWL_LEGACY_SWITCH_MIMO2_BC:
1443 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1444
1445 /* Set up search table to try MIMO */
1446 memcpy(search_tbl, tbl, sz);
1447 search_tbl->is_SGI = 0;
1448
1449 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1450 search_tbl->ant_type = ANT_AB;
1451 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1452 search_tbl->ant_type = ANT_AC;
1453 else
1454 search_tbl->ant_type = ANT_BC;
1455
1456 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1457 break;
1458
1459 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1460 search_tbl, index);
1461 if (!ret) {
1462 lq_sta->action_counter = 0;
1463 goto out;
1464 }
1465 break;
1466
1467 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1468 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1469
1470 /* Set up search table to try MIMO3 */
1471 memcpy(search_tbl, tbl, sz);
1472 search_tbl->is_SGI = 0;
1473
1474 search_tbl->ant_type = ANT_ABC;
1475
1476 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1477 break;
1478
1479 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1480 search_tbl, index);
1481 if (!ret) {
1482 lq_sta->action_counter = 0;
1483 goto out;
1484 }
1485 break;
1486 }
1487 tbl->action++;
1488 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1489 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1490
1491 if (tbl->action == start_action)
1492 break;
1493
1494 }
1495 search_tbl->lq_type = LQ_NONE;
1496 return 0;
1497
1498 out:
1499 lq_sta->search_better_tbl = 1;
1500 tbl->action++;
1501 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1502 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1503 if (update_search_tbl_counter)
1504 search_tbl->action = tbl->action;
1505 return 0;
1506
1507 }
1508
1509 /*
1510 * Try to switch to new modulation mode from SISO
1511 */
1512 static int rs_move_siso_to_other(struct iwl_priv *priv,
1513 struct iwl_lq_sta *lq_sta,
1514 struct ieee80211_conf *conf,
1515 struct ieee80211_sta *sta, int index)
1516 {
1517 u8 is_green = lq_sta->is_green;
1518 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1519 struct iwl_scale_tbl_info *search_tbl =
1520 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1521 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1522 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1523 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1524 u8 start_action = tbl->action;
1525 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1526 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1527 u8 update_search_tbl_counter = 0;
1528 int ret;
1529
1530 for (;;) {
1531 lq_sta->action_counter++;
1532 switch (tbl->action) {
1533 case IWL_SISO_SWITCH_ANTENNA1:
1534 case IWL_SISO_SWITCH_ANTENNA2:
1535 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1536
1537 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1538 tx_chains_num <= 1) ||
1539 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1540 tx_chains_num <= 2))
1541 break;
1542
1543 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1544 break;
1545
1546 memcpy(search_tbl, tbl, sz);
1547 if (rs_toggle_antenna(valid_tx_ant,
1548 &search_tbl->current_rate, search_tbl)) {
1549 update_search_tbl_counter = 1;
1550 goto out;
1551 }
1552 break;
1553 case IWL_SISO_SWITCH_MIMO2_AB:
1554 case IWL_SISO_SWITCH_MIMO2_AC:
1555 case IWL_SISO_SWITCH_MIMO2_BC:
1556 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1557 memcpy(search_tbl, tbl, sz);
1558 search_tbl->is_SGI = 0;
1559
1560 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1561 search_tbl->ant_type = ANT_AB;
1562 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1563 search_tbl->ant_type = ANT_AC;
1564 else
1565 search_tbl->ant_type = ANT_BC;
1566
1567 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1568 break;
1569
1570 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1571 search_tbl, index);
1572 if (!ret)
1573 goto out;
1574 break;
1575 case IWL_SISO_SWITCH_GI:
1576 if (!tbl->is_fat &&
1577 !(priv->current_ht_config.sgf &
1578 HT_SHORT_GI_20MHZ))
1579 break;
1580 if (tbl->is_fat &&
1581 !(priv->current_ht_config.sgf &
1582 HT_SHORT_GI_40MHZ))
1583 break;
1584
1585 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1586
1587 memcpy(search_tbl, tbl, sz);
1588 if (is_green) {
1589 if (!tbl->is_SGI)
1590 break;
1591 else
1592 IWL_ERR(priv,
1593 "SGI was set in GF+SISO\n");
1594 }
1595 search_tbl->is_SGI = !tbl->is_SGI;
1596 rs_set_expected_tpt_table(lq_sta, search_tbl);
1597 if (tbl->is_SGI) {
1598 s32 tpt = lq_sta->last_tpt / 100;
1599 if (tpt >= search_tbl->expected_tpt[index])
1600 break;
1601 }
1602 search_tbl->current_rate =
1603 rate_n_flags_from_tbl(priv, search_tbl,
1604 index, is_green);
1605 update_search_tbl_counter = 1;
1606 goto out;
1607 case IWL_SISO_SWITCH_MIMO3_ABC:
1608 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1609 memcpy(search_tbl, tbl, sz);
1610 search_tbl->is_SGI = 0;
1611 search_tbl->ant_type = ANT_ABC;
1612
1613 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1614 break;
1615
1616 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1617 search_tbl, index);
1618 if (!ret)
1619 goto out;
1620 break;
1621 }
1622 tbl->action++;
1623 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1624 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1625
1626 if (tbl->action == start_action)
1627 break;
1628 }
1629 search_tbl->lq_type = LQ_NONE;
1630 return 0;
1631
1632 out:
1633 lq_sta->search_better_tbl = 1;
1634 tbl->action++;
1635 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1636 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1637 if (update_search_tbl_counter)
1638 search_tbl->action = tbl->action;
1639
1640 return 0;
1641 }
1642
1643 /*
1644 * Try to switch to new modulation mode from MIMO2
1645 */
1646 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1647 struct iwl_lq_sta *lq_sta,
1648 struct ieee80211_conf *conf,
1649 struct ieee80211_sta *sta, int index)
1650 {
1651 s8 is_green = lq_sta->is_green;
1652 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1653 struct iwl_scale_tbl_info *search_tbl =
1654 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1655 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1656 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1657 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1658 u8 start_action = tbl->action;
1659 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1660 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1661 u8 update_search_tbl_counter = 0;
1662 int ret;
1663
1664 for (;;) {
1665 lq_sta->action_counter++;
1666 switch (tbl->action) {
1667 case IWL_MIMO2_SWITCH_ANTENNA1:
1668 case IWL_MIMO2_SWITCH_ANTENNA2:
1669 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1670
1671 if (tx_chains_num <= 2)
1672 break;
1673
1674 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1675 break;
1676
1677 memcpy(search_tbl, tbl, sz);
1678 if (rs_toggle_antenna(valid_tx_ant,
1679 &search_tbl->current_rate, search_tbl)) {
1680 update_search_tbl_counter = 1;
1681 goto out;
1682 }
1683 break;
1684 case IWL_MIMO2_SWITCH_SISO_A:
1685 case IWL_MIMO2_SWITCH_SISO_B:
1686 case IWL_MIMO2_SWITCH_SISO_C:
1687 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1688
1689 /* Set up new search table for SISO */
1690 memcpy(search_tbl, tbl, sz);
1691
1692 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1693 search_tbl->ant_type = ANT_A;
1694 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1695 search_tbl->ant_type = ANT_B;
1696 else
1697 search_tbl->ant_type = ANT_C;
1698
1699 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1700 break;
1701
1702 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1703 search_tbl, index);
1704 if (!ret)
1705 goto out;
1706
1707 break;
1708
1709 case IWL_MIMO2_SWITCH_GI:
1710 if (!tbl->is_fat &&
1711 !(priv->current_ht_config.sgf &
1712 HT_SHORT_GI_20MHZ))
1713 break;
1714 if (tbl->is_fat &&
1715 !(priv->current_ht_config.sgf &
1716 HT_SHORT_GI_40MHZ))
1717 break;
1718
1719 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1720
1721 /* Set up new search table for MIMO2 */
1722 memcpy(search_tbl, tbl, sz);
1723 search_tbl->is_SGI = !tbl->is_SGI;
1724 rs_set_expected_tpt_table(lq_sta, search_tbl);
1725 /*
1726 * If active table already uses the fastest possible
1727 * modulation (dual stream with short guard interval),
1728 * and it's working well, there's no need to look
1729 * for a better type of modulation!
1730 */
1731 if (tbl->is_SGI) {
1732 s32 tpt = lq_sta->last_tpt / 100;
1733 if (tpt >= search_tbl->expected_tpt[index])
1734 break;
1735 }
1736 search_tbl->current_rate =
1737 rate_n_flags_from_tbl(priv, search_tbl,
1738 index, is_green);
1739 update_search_tbl_counter = 1;
1740 goto out;
1741
1742 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1743 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1744 memcpy(search_tbl, tbl, sz);
1745 search_tbl->is_SGI = 0;
1746 search_tbl->ant_type = ANT_ABC;
1747
1748 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1749 break;
1750
1751 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1752 search_tbl, index);
1753 if (!ret)
1754 goto out;
1755
1756 break;
1757 }
1758 tbl->action++;
1759 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1760 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1761
1762 if (tbl->action == start_action)
1763 break;
1764 }
1765 search_tbl->lq_type = LQ_NONE;
1766 return 0;
1767 out:
1768 lq_sta->search_better_tbl = 1;
1769 tbl->action++;
1770 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1771 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1772 if (update_search_tbl_counter)
1773 search_tbl->action = tbl->action;
1774
1775 return 0;
1776
1777 }
1778
1779 /*
1780 * Try to switch to new modulation mode from MIMO3
1781 */
1782 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1783 struct iwl_lq_sta *lq_sta,
1784 struct ieee80211_conf *conf,
1785 struct ieee80211_sta *sta, int index)
1786 {
1787 s8 is_green = lq_sta->is_green;
1788 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1789 struct iwl_scale_tbl_info *search_tbl =
1790 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1791 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1792 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1793 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1794 u8 start_action = tbl->action;
1795 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1796 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1797 int ret;
1798 u8 update_search_tbl_counter = 0;
1799
1800 for (;;) {
1801 lq_sta->action_counter++;
1802 switch (tbl->action) {
1803 case IWL_MIMO3_SWITCH_ANTENNA1:
1804 case IWL_MIMO3_SWITCH_ANTENNA2:
1805 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1806
1807 if (tx_chains_num <= 3)
1808 break;
1809
1810 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1811 break;
1812
1813 memcpy(search_tbl, tbl, sz);
1814 if (rs_toggle_antenna(valid_tx_ant,
1815 &search_tbl->current_rate, search_tbl))
1816 goto out;
1817 break;
1818 case IWL_MIMO3_SWITCH_SISO_A:
1819 case IWL_MIMO3_SWITCH_SISO_B:
1820 case IWL_MIMO3_SWITCH_SISO_C:
1821 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1822
1823 /* Set up new search table for SISO */
1824 memcpy(search_tbl, tbl, sz);
1825
1826 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1827 search_tbl->ant_type = ANT_A;
1828 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1829 search_tbl->ant_type = ANT_B;
1830 else
1831 search_tbl->ant_type = ANT_C;
1832
1833 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1834 break;
1835
1836 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1837 search_tbl, index);
1838 if (!ret)
1839 goto out;
1840
1841 break;
1842
1843 case IWL_MIMO3_SWITCH_MIMO2_AB:
1844 case IWL_MIMO3_SWITCH_MIMO2_AC:
1845 case IWL_MIMO3_SWITCH_MIMO2_BC:
1846 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1847
1848 memcpy(search_tbl, tbl, sz);
1849 search_tbl->is_SGI = 0;
1850 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1851 search_tbl->ant_type = ANT_AB;
1852 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1853 search_tbl->ant_type = ANT_AC;
1854 else
1855 search_tbl->ant_type = ANT_BC;
1856
1857 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1858 break;
1859
1860 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1861 search_tbl, index);
1862 if (!ret)
1863 goto out;
1864
1865 break;
1866
1867 case IWL_MIMO3_SWITCH_GI:
1868 if (!tbl->is_fat &&
1869 !(priv->current_ht_config.sgf &
1870 HT_SHORT_GI_20MHZ))
1871 break;
1872 if (tbl->is_fat &&
1873 !(priv->current_ht_config.sgf &
1874 HT_SHORT_GI_40MHZ))
1875 break;
1876
1877 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1878
1879 /* Set up new search table for MIMO */
1880 memcpy(search_tbl, tbl, sz);
1881 search_tbl->is_SGI = !tbl->is_SGI;
1882 rs_set_expected_tpt_table(lq_sta, search_tbl);
1883 /*
1884 * If active table already uses the fastest possible
1885 * modulation (dual stream with short guard interval),
1886 * and it's working well, there's no need to look
1887 * for a better type of modulation!
1888 */
1889 if (tbl->is_SGI) {
1890 s32 tpt = lq_sta->last_tpt / 100;
1891 if (tpt >= search_tbl->expected_tpt[index])
1892 break;
1893 }
1894 search_tbl->current_rate =
1895 rate_n_flags_from_tbl(priv, search_tbl,
1896 index, is_green);
1897 update_search_tbl_counter = 1;
1898 goto out;
1899 }
1900 tbl->action++;
1901 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1902 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1903
1904 if (tbl->action == start_action)
1905 break;
1906 }
1907 search_tbl->lq_type = LQ_NONE;
1908 return 0;
1909 out:
1910 lq_sta->search_better_tbl = 1;
1911 tbl->action++;
1912 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1913 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1914 if (update_search_tbl_counter)
1915 search_tbl->action = tbl->action;
1916
1917 return 0;
1918
1919 }
1920
1921 /*
1922 * Check whether we should continue using same modulation mode, or
1923 * begin search for a new mode, based on:
1924 * 1) # tx successes or failures while using this mode
1925 * 2) # times calling this function
1926 * 3) elapsed time in this mode (not used, for now)
1927 */
1928 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1929 {
1930 struct iwl_scale_tbl_info *tbl;
1931 int i;
1932 int active_tbl;
1933 int flush_interval_passed = 0;
1934 struct iwl_priv *priv;
1935
1936 priv = lq_sta->drv;
1937 active_tbl = lq_sta->active_tbl;
1938
1939 tbl = &(lq_sta->lq_info[active_tbl]);
1940
1941 /* If we've been disallowing search, see if we should now allow it */
1942 if (lq_sta->stay_in_tbl) {
1943
1944 /* Elapsed time using current modulation mode */
1945 if (lq_sta->flush_timer)
1946 flush_interval_passed =
1947 time_after(jiffies,
1948 (unsigned long)(lq_sta->flush_timer +
1949 IWL_RATE_SCALE_FLUSH_INTVL));
1950
1951 /*
1952 * Check if we should allow search for new modulation mode.
1953 * If many frames have failed or succeeded, or we've used
1954 * this same modulation for a long time, allow search, and
1955 * reset history stats that keep track of whether we should
1956 * allow a new search. Also (below) reset all bitmaps and
1957 * stats in active history.
1958 */
1959 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1960 (lq_sta->total_success > lq_sta->max_success_limit) ||
1961 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1962 && (flush_interval_passed))) {
1963 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1964 lq_sta->total_failed,
1965 lq_sta->total_success,
1966 flush_interval_passed);
1967
1968 /* Allow search for new mode */
1969 lq_sta->stay_in_tbl = 0; /* only place reset */
1970 lq_sta->total_failed = 0;
1971 lq_sta->total_success = 0;
1972 lq_sta->flush_timer = 0;
1973
1974 /*
1975 * Else if we've used this modulation mode enough repetitions
1976 * (regardless of elapsed time or success/failure), reset
1977 * history bitmaps and rate-specific stats for all rates in
1978 * active table.
1979 */
1980 } else {
1981 lq_sta->table_count++;
1982 if (lq_sta->table_count >=
1983 lq_sta->table_count_limit) {
1984 lq_sta->table_count = 0;
1985
1986 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1987 for (i = 0; i < IWL_RATE_COUNT; i++)
1988 rs_rate_scale_clear_window(
1989 &(tbl->win[i]));
1990 }
1991 }
1992
1993 /* If transitioning to allow "search", reset all history
1994 * bitmaps and stats in active table (this will become the new
1995 * "search" table). */
1996 if (!lq_sta->stay_in_tbl) {
1997 for (i = 0; i < IWL_RATE_COUNT; i++)
1998 rs_rate_scale_clear_window(&(tbl->win[i]));
1999 }
2000 }
2001 }
2002
2003 /*
2004 * Do rate scaling and search for new modulation mode.
2005 */
2006 static void rs_rate_scale_perform(struct iwl_priv *priv,
2007 struct sk_buff *skb,
2008 struct ieee80211_sta *sta,
2009 struct iwl_lq_sta *lq_sta)
2010 {
2011 struct ieee80211_hw *hw = priv->hw;
2012 struct ieee80211_conf *conf = &hw->conf;
2013 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2014 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2015 int low = IWL_RATE_INVALID;
2016 int high = IWL_RATE_INVALID;
2017 int index;
2018 int i;
2019 struct iwl_rate_scale_data *window = NULL;
2020 int current_tpt = IWL_INVALID_VALUE;
2021 int low_tpt = IWL_INVALID_VALUE;
2022 int high_tpt = IWL_INVALID_VALUE;
2023 u32 fail_count;
2024 s8 scale_action = 0;
2025 u16 rate_mask;
2026 u8 update_lq = 0;
2027 struct iwl_scale_tbl_info *tbl, *tbl1;
2028 u16 rate_scale_index_msk = 0;
2029 u32 rate;
2030 u8 is_green = 0;
2031 u8 active_tbl = 0;
2032 u8 done_search = 0;
2033 u16 high_low;
2034 s32 sr;
2035 u8 tid = MAX_TID_COUNT;
2036 struct iwl_tid_data *tid_data;
2037
2038 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2039
2040 /* Send management frames and NO_ACK data using lowest rate. */
2041 /* TODO: this could probably be improved.. */
2042 if (!ieee80211_is_data(hdr->frame_control) ||
2043 info->flags & IEEE80211_TX_CTL_NO_ACK)
2044 return;
2045
2046 if (!sta || !lq_sta)
2047 return;
2048
2049 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2050
2051 tid = rs_tl_add_packet(lq_sta, hdr);
2052
2053 /*
2054 * Select rate-scale / modulation-mode table to work with in
2055 * the rest of this function: "search" if searching for better
2056 * modulation mode, or "active" if doing rate scaling within a mode.
2057 */
2058 if (!lq_sta->search_better_tbl)
2059 active_tbl = lq_sta->active_tbl;
2060 else
2061 active_tbl = 1 - lq_sta->active_tbl;
2062
2063 tbl = &(lq_sta->lq_info[active_tbl]);
2064 is_green = lq_sta->is_green;
2065
2066 /* current tx rate */
2067 index = lq_sta->last_txrate_idx;
2068
2069 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2070 tbl->lq_type);
2071
2072 /* rates available for this association, and for modulation mode */
2073 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2074
2075 IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
2076
2077 /* mask with station rate restriction */
2078 if (is_legacy(tbl->lq_type)) {
2079 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2080 /* supp_rates has no CCK bits in A mode */
2081 rate_scale_index_msk = (u16) (rate_mask &
2082 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2083 else
2084 rate_scale_index_msk = (u16) (rate_mask &
2085 lq_sta->supp_rates);
2086
2087 } else
2088 rate_scale_index_msk = rate_mask;
2089
2090 if (!rate_scale_index_msk)
2091 rate_scale_index_msk = rate_mask;
2092
2093 if (!((1 << index) & rate_scale_index_msk)) {
2094 IWL_ERR(priv, "Current Rate is not valid\n");
2095 return;
2096 }
2097
2098 /* Get expected throughput table and history window for current rate */
2099 if (!tbl->expected_tpt) {
2100 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2101 return;
2102 }
2103
2104 /* force user max rate if set by user */
2105 if ((lq_sta->max_rate_idx != -1) &&
2106 (lq_sta->max_rate_idx < index)) {
2107 index = lq_sta->max_rate_idx;
2108 update_lq = 1;
2109 window = &(tbl->win[index]);
2110 goto lq_update;
2111 }
2112
2113 window = &(tbl->win[index]);
2114
2115 /*
2116 * If there is not enough history to calculate actual average
2117 * throughput, keep analyzing results of more tx frames, without
2118 * changing rate or mode (bypass most of the rest of this function).
2119 * Set up new rate table in uCode only if old rate is not supported
2120 * in current association (use new rate found above).
2121 */
2122 fail_count = window->counter - window->success_counter;
2123 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2124 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2125 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2126 "for index %d\n",
2127 window->success_counter, window->counter, index);
2128
2129 /* Can't calculate this yet; not enough history */
2130 window->average_tpt = IWL_INVALID_VALUE;
2131
2132 /* Should we stay with this modulation mode,
2133 * or search for a new one? */
2134 rs_stay_in_table(lq_sta);
2135
2136 goto out;
2137 }
2138
2139 /* Else we have enough samples; calculate estimate of
2140 * actual average throughput */
2141
2142 BUG_ON(window->average_tpt != ((window->success_ratio *
2143 tbl->expected_tpt[index] + 64) / 128));
2144
2145 /* If we are searching for better modulation mode, check success. */
2146 if (lq_sta->search_better_tbl) {
2147
2148 /* If good success, continue using the "search" mode;
2149 * no need to send new link quality command, since we're
2150 * continuing to use the setup that we've been trying. */
2151 if (window->average_tpt > lq_sta->last_tpt) {
2152
2153 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2154 "suc=%d cur-tpt=%d old-tpt=%d\n",
2155 window->success_ratio,
2156 window->average_tpt,
2157 lq_sta->last_tpt);
2158
2159 if (!is_legacy(tbl->lq_type))
2160 lq_sta->enable_counter = 1;
2161
2162 /* Swap tables; "search" becomes "active" */
2163 lq_sta->active_tbl = active_tbl;
2164 current_tpt = window->average_tpt;
2165
2166 /* Else poor success; go back to mode in "active" table */
2167 } else {
2168
2169 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2170 "suc=%d cur-tpt=%d old-tpt=%d\n",
2171 window->success_ratio,
2172 window->average_tpt,
2173 lq_sta->last_tpt);
2174
2175 /* Nullify "search" table */
2176 tbl->lq_type = LQ_NONE;
2177
2178 /* Revert to "active" table */
2179 active_tbl = lq_sta->active_tbl;
2180 tbl = &(lq_sta->lq_info[active_tbl]);
2181
2182 /* Revert to "active" rate and throughput info */
2183 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2184 current_tpt = lq_sta->last_tpt;
2185
2186 /* Need to set up a new rate table in uCode */
2187 update_lq = 1;
2188 }
2189
2190 /* Either way, we've made a decision; modulation mode
2191 * search is done, allow rate adjustment next time. */
2192 lq_sta->search_better_tbl = 0;
2193 done_search = 1; /* Don't switch modes below! */
2194 goto lq_update;
2195 }
2196
2197 /* (Else) not in search of better modulation mode, try for better
2198 * starting rate, while staying in this mode. */
2199 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2200 tbl->lq_type);
2201 low = high_low & 0xff;
2202 high = (high_low >> 8) & 0xff;
2203
2204 /* If user set max rate, dont allow higher than user constrain */
2205 if ((lq_sta->max_rate_idx != -1) &&
2206 (lq_sta->max_rate_idx < high))
2207 high = IWL_RATE_INVALID;
2208
2209 sr = window->success_ratio;
2210
2211 /* Collect measured throughputs for current and adjacent rates */
2212 current_tpt = window->average_tpt;
2213 if (low != IWL_RATE_INVALID)
2214 low_tpt = tbl->win[low].average_tpt;
2215 if (high != IWL_RATE_INVALID)
2216 high_tpt = tbl->win[high].average_tpt;
2217
2218 scale_action = 0;
2219
2220 /* Too many failures, decrease rate */
2221 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2222 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2223 scale_action = -1;
2224
2225 /* No throughput measured yet for adjacent rates; try increase. */
2226 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2227 (high_tpt == IWL_INVALID_VALUE)) {
2228
2229 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2230 scale_action = 1;
2231 else if (low != IWL_RATE_INVALID)
2232 scale_action = 0;
2233 }
2234
2235 /* Both adjacent throughputs are measured, but neither one has better
2236 * throughput; we're using the best rate, don't change it! */
2237 else if ((low_tpt != IWL_INVALID_VALUE) &&
2238 (high_tpt != IWL_INVALID_VALUE) &&
2239 (low_tpt < current_tpt) &&
2240 (high_tpt < current_tpt))
2241 scale_action = 0;
2242
2243 /* At least one adjacent rate's throughput is measured,
2244 * and may have better performance. */
2245 else {
2246 /* Higher adjacent rate's throughput is measured */
2247 if (high_tpt != IWL_INVALID_VALUE) {
2248 /* Higher rate has better throughput */
2249 if (high_tpt > current_tpt &&
2250 sr >= IWL_RATE_INCREASE_TH) {
2251 scale_action = 1;
2252 } else {
2253 scale_action = 0;
2254 }
2255
2256 /* Lower adjacent rate's throughput is measured */
2257 } else if (low_tpt != IWL_INVALID_VALUE) {
2258 /* Lower rate has better throughput */
2259 if (low_tpt > current_tpt) {
2260 IWL_DEBUG_RATE(priv,
2261 "decrease rate because of low tpt\n");
2262 scale_action = -1;
2263 } else if (sr >= IWL_RATE_INCREASE_TH) {
2264 scale_action = 1;
2265 }
2266 }
2267 }
2268
2269 /* Sanity check; asked for decrease, but success rate or throughput
2270 * has been good at old rate. Don't change it. */
2271 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2272 ((sr > IWL_RATE_HIGH_TH) ||
2273 (current_tpt > (100 * tbl->expected_tpt[low]))))
2274 scale_action = 0;
2275
2276 switch (scale_action) {
2277 case -1:
2278 /* Decrease starting rate, update uCode's rate table */
2279 if (low != IWL_RATE_INVALID) {
2280 update_lq = 1;
2281 index = low;
2282 }
2283
2284 break;
2285 case 1:
2286 /* Increase starting rate, update uCode's rate table */
2287 if (high != IWL_RATE_INVALID) {
2288 update_lq = 1;
2289 index = high;
2290 }
2291
2292 break;
2293 case 0:
2294 /* No change */
2295 default:
2296 break;
2297 }
2298
2299 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2300 "high %d type %d\n",
2301 index, scale_action, low, high, tbl->lq_type);
2302
2303 lq_update:
2304 /* Replace uCode's rate table for the destination station. */
2305 if (update_lq) {
2306 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2307 rs_fill_link_cmd(priv, lq_sta, rate);
2308 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2309 }
2310
2311 /* Should we stay with this modulation mode, or search for a new one? */
2312 rs_stay_in_table(lq_sta);
2313
2314 /*
2315 * Search for new modulation mode if we're:
2316 * 1) Not changing rates right now
2317 * 2) Not just finishing up a search
2318 * 3) Allowing a new search
2319 */
2320 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2321 /* Save current throughput to compare with "search" throughput*/
2322 lq_sta->last_tpt = current_tpt;
2323
2324 /* Select a new "search" modulation mode to try.
2325 * If one is found, set up the new "search" table. */
2326 if (is_legacy(tbl->lq_type))
2327 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2328 else if (is_siso(tbl->lq_type))
2329 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2330 else if (is_mimo2(tbl->lq_type))
2331 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2332 else
2333 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2334
2335 /* If new "search" mode was selected, set up in uCode table */
2336 if (lq_sta->search_better_tbl) {
2337 /* Access the "search" table, clear its history. */
2338 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2339 for (i = 0; i < IWL_RATE_COUNT; i++)
2340 rs_rate_scale_clear_window(&(tbl->win[i]));
2341
2342 /* Use new "search" start rate */
2343 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2344
2345 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2346 tbl->current_rate, index);
2347 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2348 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2349 } else
2350 done_search = 1;
2351 }
2352
2353 if (done_search && !lq_sta->stay_in_tbl) {
2354 /* If the "active" (non-search) mode was legacy,
2355 * and we've tried switching antennas,
2356 * but we haven't been able to try HT modes (not available),
2357 * stay with best antenna legacy modulation for a while
2358 * before next round of mode comparisons. */
2359 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2360 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2361 lq_sta->action_counter > tbl1->max_search) {
2362 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2363 rs_set_stay_in_table(priv, 1, lq_sta);
2364 }
2365
2366 /* If we're in an HT mode, and all 3 mode switch actions
2367 * have been tried and compared, stay in this best modulation
2368 * mode for a while before next round of mode comparisons. */
2369 if (lq_sta->enable_counter &&
2370 (lq_sta->action_counter >= tbl1->max_search)) {
2371 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2372 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2373 (tid != MAX_TID_COUNT)) {
2374 tid_data =
2375 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2376 if (tid_data->agg.state == IWL_AGG_OFF) {
2377 IWL_DEBUG_RATE(priv,
2378 "try to aggregate tid %d\n",
2379 tid);
2380 rs_tl_turn_on_agg(priv, tid,
2381 lq_sta, sta);
2382 }
2383 }
2384 rs_set_stay_in_table(priv, 0, lq_sta);
2385 }
2386 }
2387
2388 out:
2389 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2390 i = index;
2391 lq_sta->last_txrate_idx = i;
2392
2393 return;
2394 }
2395
2396
2397 static void rs_initialize_lq(struct iwl_priv *priv,
2398 struct ieee80211_conf *conf,
2399 struct ieee80211_sta *sta,
2400 struct iwl_lq_sta *lq_sta)
2401 {
2402 struct iwl_scale_tbl_info *tbl;
2403 int rate_idx;
2404 int i;
2405 u32 rate;
2406 u8 use_green = rs_use_green(priv, conf);
2407 u8 active_tbl = 0;
2408 u8 valid_tx_ant;
2409
2410 if (!sta || !lq_sta)
2411 goto out;
2412
2413 i = lq_sta->last_txrate_idx;
2414
2415 if ((lq_sta->lq.sta_id == 0xff) &&
2416 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2417 goto out;
2418
2419 valid_tx_ant = priv->hw_params.valid_tx_ant;
2420
2421 if (!lq_sta->search_better_tbl)
2422 active_tbl = lq_sta->active_tbl;
2423 else
2424 active_tbl = 1 - lq_sta->active_tbl;
2425
2426 tbl = &(lq_sta->lq_info[active_tbl]);
2427
2428 if ((i < 0) || (i >= IWL_RATE_COUNT))
2429 i = 0;
2430
2431 rate = iwl_rates[i].plcp;
2432 tbl->ant_type = first_antenna(valid_tx_ant);
2433 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2434
2435 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2436 rate |= RATE_MCS_CCK_MSK;
2437
2438 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2439 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2440 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2441
2442 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2443 tbl->current_rate = rate;
2444 rs_set_expected_tpt_table(lq_sta, tbl);
2445 rs_fill_link_cmd(NULL, lq_sta, rate);
2446 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2447 out:
2448 return;
2449 }
2450
2451 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2452 struct ieee80211_tx_rate_control *txrc)
2453 {
2454
2455 struct sk_buff *skb = txrc->skb;
2456 struct ieee80211_supported_band *sband = txrc->sband;
2457 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2458 struct ieee80211_conf *conf = &priv->hw->conf;
2459 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2460 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2461 struct iwl_lq_sta *lq_sta = priv_sta;
2462 int rate_idx;
2463 u64 mask_bit = 0;
2464
2465 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2466
2467 /* Get max rate if user set max rate */
2468 if (lq_sta) {
2469 lq_sta->max_rate_idx = txrc->max_rate_idx;
2470 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2471 (lq_sta->max_rate_idx != -1))
2472 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2473 if ((lq_sta->max_rate_idx < 0) ||
2474 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2475 lq_sta->max_rate_idx = -1;
2476 }
2477
2478 if (sta)
2479 mask_bit = sta->supp_rates[sband->band];
2480
2481 /* Send management frames and NO_ACK data using lowest rate. */
2482 if (!ieee80211_is_data(hdr->frame_control) ||
2483 info->flags & IEEE80211_TX_CTL_NO_ACK || !sta || !lq_sta) {
2484 if (!mask_bit)
2485 info->control.rates[0].idx =
2486 rate_lowest_index(sband, NULL);
2487 else
2488 info->control.rates[0].idx =
2489 rate_lowest_index(sband, sta);
2490 if (info->flags & IEEE80211_TX_CTL_NO_ACK)
2491 info->control.rates[0].count = 1;
2492 return;
2493 }
2494
2495 rate_idx = lq_sta->last_txrate_idx;
2496
2497 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2498 !lq_sta->ibss_sta_added) {
2499 u8 sta_id = priv->cfg->ops->smgmt->find_station(priv,
2500 hdr->addr1);
2501
2502 if (sta_id == IWL_INVALID_STATION) {
2503 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2504 hdr->addr1);
2505 sta_id = priv->cfg->ops->smgmt->add_station(priv,
2506 hdr->addr1, 0,
2507 CMD_ASYNC, NULL);
2508 }
2509 if ((sta_id != IWL_INVALID_STATION)) {
2510 lq_sta->lq.sta_id = sta_id;
2511 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2512 lq_sta->ibss_sta_added = 1;
2513 rs_initialize_lq(priv, conf, sta, lq_sta);
2514 }
2515 }
2516
2517 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2518 rate_idx = rate_lowest_index(sband, sta);
2519 else if (sband->band == IEEE80211_BAND_5GHZ)
2520 rate_idx -= IWL_FIRST_OFDM_RATE;
2521
2522 info->control.rates[0].idx = rate_idx;
2523 }
2524
2525 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2526 gfp_t gfp)
2527 {
2528 struct iwl_lq_sta *lq_sta;
2529 struct iwl_priv *priv;
2530 int i, j;
2531
2532 priv = (struct iwl_priv *)priv_rate;
2533 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2534
2535 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2536
2537 if (lq_sta == NULL)
2538 return NULL;
2539 lq_sta->lq.sta_id = 0xff;
2540
2541
2542 for (j = 0; j < LQ_SIZE; j++)
2543 for (i = 0; i < IWL_RATE_COUNT; i++)
2544 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2545
2546 return lq_sta;
2547 }
2548
2549 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2550 struct ieee80211_sta *sta, void *priv_sta)
2551 {
2552 int i, j;
2553 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2554 struct ieee80211_conf *conf = &priv->hw->conf;
2555 struct iwl_lq_sta *lq_sta = priv_sta;
2556 u16 mask_bit = 0;
2557 int count;
2558 int start_rate = 0;
2559
2560 lq_sta->flush_timer = 0;
2561 lq_sta->supp_rates = sta->supp_rates[sband->band];
2562 for (j = 0; j < LQ_SIZE; j++)
2563 for (i = 0; i < IWL_RATE_COUNT; i++)
2564 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2565
2566 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
2567 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2568 * the lowest or the highest rate.. Could consider using RSSI from
2569 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2570 * after assoc.. */
2571
2572 lq_sta->ibss_sta_added = 0;
2573 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2574 u8 sta_id = priv->cfg->ops->smgmt->find_station(priv,
2575 sta->addr);
2576
2577 /* for IBSS the call are from tasklet */
2578 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2579
2580 if (sta_id == IWL_INVALID_STATION) {
2581 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2582 sta_id = priv->cfg->ops->smgmt->add_station(priv,
2583 sta->addr, 0,
2584 CMD_ASYNC, NULL);
2585 }
2586 if ((sta_id != IWL_INVALID_STATION)) {
2587 lq_sta->lq.sta_id = sta_id;
2588 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2589 }
2590 /* FIXME: this is w/a remove it later */
2591 priv->assoc_station_added = 1;
2592 }
2593
2594 lq_sta->is_dup = 0;
2595 lq_sta->max_rate_idx = -1;
2596 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2597 lq_sta->is_green = rs_use_green(priv, conf);
2598 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2599 lq_sta->active_rate_basic = priv->active_rate_basic;
2600 lq_sta->band = priv->band;
2601 /*
2602 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2603 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2604 */
2605 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2606 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2607 lq_sta->active_siso_rate &= ~((u16)0x2);
2608 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2609
2610 /* Same here */
2611 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2612 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2613 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2614 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2615
2616 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2617 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2618 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2619 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2620
2621 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2622 lq_sta->active_siso_rate,
2623 lq_sta->active_mimo2_rate,
2624 lq_sta->active_mimo3_rate);
2625
2626 /* These values will be overridden later */
2627 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2628 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2629
2630 /* as default allow aggregation for all tids */
2631 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2632 lq_sta->drv = priv;
2633
2634 /* Find highest tx rate supported by hardware and destination station */
2635 mask_bit = sta->supp_rates[sband->band];
2636 count = sband->n_bitrates;
2637 if (sband->band == IEEE80211_BAND_5GHZ) {
2638 count += IWL_FIRST_OFDM_RATE;
2639 start_rate = IWL_FIRST_OFDM_RATE;
2640 mask_bit <<= IWL_FIRST_OFDM_RATE;
2641 }
2642
2643 mask_bit = mask_bit & lq_sta->active_legacy_rate;
2644 lq_sta->last_txrate_idx = 4;
2645 for (i = start_rate; i < count; i++)
2646 if (mask_bit & BIT(i))
2647 lq_sta->last_txrate_idx = i;
2648
2649 rs_initialize_lq(priv, conf, sta, lq_sta);
2650 }
2651
2652 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2653 struct iwl_lq_sta *lq_sta, u32 new_rate)
2654 {
2655 struct iwl_scale_tbl_info tbl_type;
2656 int index = 0;
2657 int rate_idx;
2658 int repeat_rate = 0;
2659 u8 ant_toggle_cnt = 0;
2660 u8 use_ht_possible = 1;
2661 u8 valid_tx_ant = 0;
2662 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2663
2664 /* Override starting rate (index 0) if needed for debug purposes */
2665 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2666
2667 /* Interpret new_rate (rate_n_flags) */
2668 memset(&tbl_type, 0, sizeof(tbl_type));
2669 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2670 &tbl_type, &rate_idx);
2671
2672 /* How many times should we repeat the initial rate? */
2673 if (is_legacy(tbl_type.lq_type)) {
2674 ant_toggle_cnt = 1;
2675 repeat_rate = IWL_NUMBER_TRY;
2676 } else {
2677 repeat_rate = IWL_HT_NUMBER_TRY;
2678 }
2679
2680 lq_cmd->general_params.mimo_delimiter =
2681 is_mimo(tbl_type.lq_type) ? 1 : 0;
2682
2683 /* Fill 1st table entry (index 0) */
2684 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2685
2686 if (num_of_ant(tbl_type.ant_type) == 1) {
2687 lq_cmd->general_params.single_stream_ant_msk =
2688 tbl_type.ant_type;
2689 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2690 lq_cmd->general_params.dual_stream_ant_msk =
2691 tbl_type.ant_type;
2692 } /* otherwise we don't modify the existing value */
2693
2694 index++;
2695 repeat_rate--;
2696
2697 if (priv)
2698 valid_tx_ant = priv->hw_params.valid_tx_ant;
2699
2700 /* Fill rest of rate table */
2701 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2702 /* Repeat initial/next rate.
2703 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2704 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2705 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2706 if (is_legacy(tbl_type.lq_type)) {
2707 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2708 ant_toggle_cnt++;
2709 else if (priv &&
2710 rs_toggle_antenna(valid_tx_ant,
2711 &new_rate, &tbl_type))
2712 ant_toggle_cnt = 1;
2713 }
2714
2715 /* Override next rate if needed for debug purposes */
2716 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2717
2718 /* Fill next table entry */
2719 lq_cmd->rs_table[index].rate_n_flags =
2720 cpu_to_le32(new_rate);
2721 repeat_rate--;
2722 index++;
2723 }
2724
2725 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2726 &rate_idx);
2727
2728 /* Indicate to uCode which entries might be MIMO.
2729 * If initial rate was MIMO, this will finally end up
2730 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2731 if (is_mimo(tbl_type.lq_type))
2732 lq_cmd->general_params.mimo_delimiter = index;
2733
2734 /* Get next rate */
2735 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2736 use_ht_possible);
2737
2738 /* How many times should we repeat the next rate? */
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 repeat_rate = IWL_NUMBER_TRY;
2748 } else {
2749 repeat_rate = IWL_HT_NUMBER_TRY;
2750 }
2751
2752 /* Don't allow HT rates after next pass.
2753 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2754 use_ht_possible = 0;
2755
2756 /* Override next rate if needed for debug purposes */
2757 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2758
2759 /* Fill next table entry */
2760 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2761
2762 index++;
2763 repeat_rate--;
2764 }
2765
2766 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2767 lq_cmd->agg_params.agg_dis_start_th = 3;
2768 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2769 }
2770
2771 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2772 {
2773 return hw->priv;
2774 }
2775 /* rate scale requires free function to be implemented */
2776 static void rs_free(void *priv_rate)
2777 {
2778 return;
2779 }
2780
2781 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2782 void *priv_sta)
2783 {
2784 struct iwl_lq_sta *lq_sta = priv_sta;
2785 struct iwl_priv *priv __maybe_unused = priv_r;
2786
2787 IWL_DEBUG_RATE(priv, "enter\n");
2788 kfree(lq_sta);
2789 IWL_DEBUG_RATE(priv, "leave\n");
2790 }
2791
2792
2793 #ifdef CONFIG_MAC80211_DEBUGFS
2794 static int open_file_generic(struct inode *inode, struct file *file)
2795 {
2796 file->private_data = inode->i_private;
2797 return 0;
2798 }
2799 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2800 u32 *rate_n_flags, int index)
2801 {
2802 struct iwl_priv *priv;
2803 u8 valid_tx_ant;
2804 u8 ant_sel_tx;
2805
2806 priv = lq_sta->drv;
2807 valid_tx_ant = priv->hw_params.valid_tx_ant;
2808 if (lq_sta->dbg_fixed_rate) {
2809 ant_sel_tx =
2810 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2811 >> RATE_MCS_ANT_POS);
2812 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2813 *rate_n_flags = lq_sta->dbg_fixed_rate;
2814 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2815 } else {
2816 lq_sta->dbg_fixed_rate = 0;
2817 IWL_ERR(priv,
2818 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2819 ant_sel_tx, valid_tx_ant);
2820 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2821 }
2822 } else {
2823 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2824 }
2825 }
2826
2827 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2828 const char __user *user_buf, size_t count, loff_t *ppos)
2829 {
2830 struct iwl_lq_sta *lq_sta = file->private_data;
2831 struct iwl_priv *priv;
2832 char buf[64];
2833 int buf_size;
2834 u32 parsed_rate;
2835
2836 priv = lq_sta->drv;
2837 memset(buf, 0, sizeof(buf));
2838 buf_size = min(count, sizeof(buf) - 1);
2839 if (copy_from_user(buf, user_buf, buf_size))
2840 return -EFAULT;
2841
2842 if (sscanf(buf, "%x", &parsed_rate) == 1)
2843 lq_sta->dbg_fixed_rate = parsed_rate;
2844 else
2845 lq_sta->dbg_fixed_rate = 0;
2846
2847 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2848 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2849 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2850 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2851
2852 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2853 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2854
2855 if (lq_sta->dbg_fixed_rate) {
2856 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2857 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2858 }
2859
2860 return count;
2861 }
2862
2863 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2864 char __user *user_buf, size_t count, loff_t *ppos)
2865 {
2866 char *buff;
2867 int desc = 0;
2868 int i = 0;
2869 int index = 0;
2870 ssize_t ret;
2871
2872 struct iwl_lq_sta *lq_sta = file->private_data;
2873 struct iwl_priv *priv;
2874 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2875
2876 priv = lq_sta->drv;
2877 buff = kmalloc(1024, GFP_KERNEL);
2878 if (!buff)
2879 return -ENOMEM;
2880
2881 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2882 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2883 lq_sta->total_failed, lq_sta->total_success,
2884 lq_sta->active_legacy_rate);
2885 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2886 lq_sta->dbg_fixed_rate);
2887 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2888 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2889 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2890 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2891 desc += sprintf(buff+desc, "lq type %s\n",
2892 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2893 if (is_Ht(tbl->lq_type)) {
2894 desc += sprintf(buff+desc, " %s",
2895 (is_siso(tbl->lq_type)) ? "SISO" :
2896 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2897 desc += sprintf(buff+desc, " %s",
2898 (tbl->is_fat) ? "40MHz" : "20MHz");
2899 desc += sprintf(buff+desc, " %s\n", (tbl->is_SGI) ? "SGI" : "");
2900 }
2901 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2902 lq_sta->last_rate_n_flags);
2903 desc += sprintf(buff+desc, "general:"
2904 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2905 lq_sta->lq.general_params.flags,
2906 lq_sta->lq.general_params.mimo_delimiter,
2907 lq_sta->lq.general_params.single_stream_ant_msk,
2908 lq_sta->lq.general_params.dual_stream_ant_msk);
2909
2910 desc += sprintf(buff+desc, "agg:"
2911 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2912 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2913 lq_sta->lq.agg_params.agg_dis_start_th,
2914 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2915
2916 desc += sprintf(buff+desc,
2917 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2918 lq_sta->lq.general_params.start_rate_index[0],
2919 lq_sta->lq.general_params.start_rate_index[1],
2920 lq_sta->lq.general_params.start_rate_index[2],
2921 lq_sta->lq.general_params.start_rate_index[3]);
2922
2923 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2924 index = iwl_hwrate_to_plcp_idx(
2925 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2926 if (is_legacy(tbl->lq_type)) {
2927 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2928 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2929 iwl_rate_mcs[index].mbps);
2930 } else {
2931 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2932 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2933 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2934 }
2935 }
2936
2937 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2938 kfree(buff);
2939 return ret;
2940 }
2941
2942 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2943 .write = rs_sta_dbgfs_scale_table_write,
2944 .read = rs_sta_dbgfs_scale_table_read,
2945 .open = open_file_generic,
2946 };
2947 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2948 char __user *user_buf, size_t count, loff_t *ppos)
2949 {
2950 char *buff;
2951 int desc = 0;
2952 int i, j;
2953 ssize_t ret;
2954
2955 struct iwl_lq_sta *lq_sta = file->private_data;
2956
2957 buff = kmalloc(1024, GFP_KERNEL);
2958 if (!buff)
2959 return -ENOMEM;
2960
2961 for (i = 0; i < LQ_SIZE; i++) {
2962 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2963 "rate=0x%X\n",
2964 lq_sta->active_tbl == i ? "*" : "x",
2965 lq_sta->lq_info[i].lq_type,
2966 lq_sta->lq_info[i].is_SGI,
2967 lq_sta->lq_info[i].is_fat,
2968 lq_sta->lq_info[i].is_dup,
2969 lq_sta->lq_info[i].current_rate);
2970 for (j = 0; j < IWL_RATE_COUNT; j++) {
2971 desc += sprintf(buff+desc,
2972 "counter=%d success=%d %%=%d\n",
2973 lq_sta->lq_info[i].win[j].counter,
2974 lq_sta->lq_info[i].win[j].success_counter,
2975 lq_sta->lq_info[i].win[j].success_ratio);
2976 }
2977 }
2978 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2979 kfree(buff);
2980 return ret;
2981 }
2982
2983 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2984 .read = rs_sta_dbgfs_stats_table_read,
2985 .open = open_file_generic,
2986 };
2987
2988 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2989 char __user *user_buf, size_t count, loff_t *ppos)
2990 {
2991 char buff[120];
2992 int desc = 0;
2993 ssize_t ret;
2994
2995 struct iwl_lq_sta *lq_sta = file->private_data;
2996 struct iwl_priv *priv;
2997 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2998
2999 priv = lq_sta->drv;
3000
3001 if (is_Ht(tbl->lq_type))
3002 desc += sprintf(buff+desc,
3003 "Bit Rate= %d Mb/s\n",
3004 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3005 else
3006 desc += sprintf(buff+desc,
3007 "Bit Rate= %d Mb/s\n",
3008 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3009 desc += sprintf(buff+desc,
3010 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3011 priv->last_rx_rssi, priv->last_rx_noise);
3012 desc += sprintf(buff+desc,
3013 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3014 priv->last_tsf, priv->last_beacon_time);
3015
3016 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3017 return ret;
3018 }
3019
3020 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3021 .read = rs_sta_dbgfs_rate_scale_data_read,
3022 .open = open_file_generic,
3023 };
3024
3025 static void rs_add_debugfs(void *priv, void *priv_sta,
3026 struct dentry *dir)
3027 {
3028 struct iwl_lq_sta *lq_sta = priv_sta;
3029 lq_sta->rs_sta_dbgfs_scale_table_file =
3030 debugfs_create_file("rate_scale_table", 0600, dir,
3031 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3032 lq_sta->rs_sta_dbgfs_stats_table_file =
3033 debugfs_create_file("rate_stats_table", 0600, dir,
3034 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3035 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3036 debugfs_create_file("rate_scale_data", 0600, dir,
3037 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3038 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3039 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3040 &lq_sta->tx_agg_tid_en);
3041
3042 }
3043
3044 static void rs_remove_debugfs(void *priv, void *priv_sta)
3045 {
3046 struct iwl_lq_sta *lq_sta = priv_sta;
3047 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3048 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3049 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3050 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3051 }
3052 #endif
3053
3054 static struct rate_control_ops rs_ops = {
3055 .module = NULL,
3056 .name = RS_NAME,
3057 .tx_status = rs_tx_status,
3058 .get_rate = rs_get_rate,
3059 .rate_init = rs_rate_init,
3060 .alloc = rs_alloc,
3061 .free = rs_free,
3062 .alloc_sta = rs_alloc_sta,
3063 .free_sta = rs_free_sta,
3064 #ifdef CONFIG_MAC80211_DEBUGFS
3065 .add_sta_debugfs = rs_add_debugfs,
3066 .remove_sta_debugfs = rs_remove_debugfs,
3067 #endif
3068 };
3069
3070 int iwlagn_rate_control_register(void)
3071 {
3072 return ieee80211_rate_control_register(&rs_ops);
3073 }
3074
3075 void iwlagn_rate_control_unregister(void)
3076 {
3077 ieee80211_rate_control_unregister(&rs_ops);
3078 }
3079
AMDTP streaming driver for the Linux FireWire stack (Juju)