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iwlwifi: Fix handling of retry count of NO_ACK frames in iwl-{3945|agn}-rs
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
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 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
104 u32 current_rate; /* rate_n_flags, uCode API format */
105 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
106 };
107
108 struct iwl_traffic_load {
109 unsigned long time_stamp; /* age of the oldest statistics */
110 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
111 * slice */
112 u32 total; /* total num of packets during the
113 * last TID_MAX_TIME_DIFF */
114 u8 queue_count; /* number of queues that has
115 * been used since the last cleanup */
116 u8 head; /* start of the circular buffer */
117 };
118
119 /**
120 * struct iwl_lq_sta -- driver's rate scaling private structure
121 *
122 * Pointer to this gets passed back and forth between driver and mac80211.
123 */
124 struct iwl_lq_sta {
125 u8 active_tbl; /* index of active table, range 0-1 */
126 u8 enable_counter; /* indicates HT mode */
127 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
128 u8 search_better_tbl; /* 1: currently trying alternate mode */
129 s32 last_tpt;
130
131 /* The following determine when to search for a new mode */
132 u32 table_count_limit;
133 u32 max_failure_limit; /* # failed frames before new search */
134 u32 max_success_limit; /* # successful frames before new search */
135 u32 table_count;
136 u32 total_failed; /* total failed frames, any/all rates */
137 u32 total_success; /* total successful frames, any/all rates */
138 u64 flush_timer; /* time staying in mode before new search */
139
140 u8 action_counter; /* # mode-switch actions tried */
141 u8 is_green;
142 u8 is_dup;
143 enum ieee80211_band band;
144 u8 ibss_sta_added;
145
146 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
147 u32 supp_rates;
148 u16 active_legacy_rate;
149 u16 active_siso_rate;
150 u16 active_mimo2_rate;
151 u16 active_mimo3_rate;
152 u16 active_rate_basic;
153 s8 max_rate_idx; /* Max rate set by user */
154 u8 missed_rate_counter;
155
156 struct iwl_link_quality_cmd lq;
157 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
158 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
159 u8 tx_agg_tid_en;
160 #ifdef CONFIG_MAC80211_DEBUGFS
161 struct dentry *rs_sta_dbgfs_scale_table_file;
162 struct dentry *rs_sta_dbgfs_stats_table_file;
163 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
164 u32 dbg_fixed_rate;
165 #endif
166 struct iwl_priv *drv;
167
168 /* used to be in sta_info */
169 int last_txrate_idx;
170 /* last tx rate_n_flags */
171 u32 last_rate_n_flags;
172 };
173
174 static void rs_rate_scale_perform(struct iwl_priv *priv,
175 struct sk_buff *skb,
176 struct ieee80211_sta *sta,
177 struct iwl_lq_sta *lq_sta);
178 static void rs_fill_link_cmd(const struct iwl_priv *priv,
179 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
180
181
182 #ifdef CONFIG_MAC80211_DEBUGFS
183 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
184 u32 *rate_n_flags, int index);
185 #else
186 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
187 u32 *rate_n_flags, int index)
188 {}
189 #endif
190
191 /*
192 * Expected throughput metrics for following rates:
193 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
194 * "G" is the only table that supports CCK (the first 4 rates).
195 */
196
197 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
198 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
199 };
200
201 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
202 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
203 };
204
205 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
206 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
207 };
208
209 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
210 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
211 };
212
213 static s32 expected_tpt_mimo2_20MHz[IWL_RATE_COUNT] = {
214 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
215 };
216
217 static s32 expected_tpt_mimo2_20MHzSGI[IWL_RATE_COUNT] = {
218 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
219 };
220
221 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
222 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
223 };
224
225 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
226 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
227 };
228
229 static s32 expected_tpt_mimo2_40MHz[IWL_RATE_COUNT] = {
230 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
231 };
232
233 static s32 expected_tpt_mimo2_40MHzSGI[IWL_RATE_COUNT] = {
234 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
235 };
236
237 /* Expected throughput metric MIMO3 */
238 static s32 expected_tpt_mimo3_20MHz[IWL_RATE_COUNT] = {
239 0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
240 };
241
242 static s32 expected_tpt_mimo3_20MHzSGI[IWL_RATE_COUNT] = {
243 0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
244 };
245
246 static s32 expected_tpt_mimo3_40MHz[IWL_RATE_COUNT] = {
247 0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
248 };
249
250 static s32 expected_tpt_mimo3_40MHzSGI[IWL_RATE_COUNT] = {
251 0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
252 };
253
254 /* mbps, mcs */
255 const static struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
256 {"1", ""},
257 {"2", ""},
258 {"5.5", ""},
259 {"11", ""},
260 {"6", "BPSK 1/2"},
261 {"9", "BPSK 1/2"},
262 {"12", "QPSK 1/2"},
263 {"18", "QPSK 3/4"},
264 {"24", "16QAM 1/2"},
265 {"36", "16QAM 3/4"},
266 {"48", "64QAM 2/3"},
267 {"54", "64QAM 3/4"},
268 {"60", "64QAM 5/6"}
269 };
270
271 static inline u8 rs_extract_rate(u32 rate_n_flags)
272 {
273 return (u8)(rate_n_flags & 0xFF);
274 }
275
276 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
277 {
278 window->data = 0;
279 window->success_counter = 0;
280 window->success_ratio = IWL_INVALID_VALUE;
281 window->counter = 0;
282 window->average_tpt = IWL_INVALID_VALUE;
283 window->stamp = 0;
284 }
285
286 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
287 {
288 return (ant_type & valid_antenna) == ant_type;
289 }
290
291 /*
292 * removes the old data from the statistics. All data that is older than
293 * TID_MAX_TIME_DIFF, will be deleted.
294 */
295 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
296 {
297 /* The oldest age we want to keep */
298 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
299
300 while (tl->queue_count &&
301 (tl->time_stamp < oldest_time)) {
302 tl->total -= tl->packet_count[tl->head];
303 tl->packet_count[tl->head] = 0;
304 tl->time_stamp += TID_QUEUE_CELL_SPACING;
305 tl->queue_count--;
306 tl->head++;
307 if (tl->head >= TID_QUEUE_MAX_SIZE)
308 tl->head = 0;
309 }
310 }
311
312 /*
313 * increment traffic load value for tid and also remove
314 * any old values if passed the certain time period
315 */
316 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
317 struct ieee80211_hdr *hdr)
318 {
319 u32 curr_time = jiffies_to_msecs(jiffies);
320 u32 time_diff;
321 s32 index;
322 struct iwl_traffic_load *tl = NULL;
323 u8 tid;
324
325 if (ieee80211_is_data_qos(hdr->frame_control)) {
326 u8 *qc = ieee80211_get_qos_ctl(hdr);
327 tid = qc[0] & 0xf;
328 } else
329 return MAX_TID_COUNT;
330
331 tl = &lq_data->load[tid];
332
333 curr_time -= curr_time % TID_ROUND_VALUE;
334
335 /* Happens only for the first packet. Initialize the data */
336 if (!(tl->queue_count)) {
337 tl->total = 1;
338 tl->time_stamp = curr_time;
339 tl->queue_count = 1;
340 tl->head = 0;
341 tl->packet_count[0] = 1;
342 return MAX_TID_COUNT;
343 }
344
345 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
346 index = time_diff / TID_QUEUE_CELL_SPACING;
347
348 /* The history is too long: remove data that is older than */
349 /* TID_MAX_TIME_DIFF */
350 if (index >= TID_QUEUE_MAX_SIZE)
351 rs_tl_rm_old_stats(tl, curr_time);
352
353 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
354 tl->packet_count[index] = tl->packet_count[index] + 1;
355 tl->total = tl->total + 1;
356
357 if ((index + 1) > tl->queue_count)
358 tl->queue_count = index + 1;
359
360 return tid;
361 }
362
363 /*
364 get the traffic load value for tid
365 */
366 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
367 {
368 u32 curr_time = jiffies_to_msecs(jiffies);
369 u32 time_diff;
370 s32 index;
371 struct iwl_traffic_load *tl = NULL;
372
373 if (tid >= TID_MAX_LOAD_COUNT)
374 return 0;
375
376 tl = &(lq_data->load[tid]);
377
378 curr_time -= curr_time % TID_ROUND_VALUE;
379
380 if (!(tl->queue_count))
381 return 0;
382
383 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
384 index = time_diff / TID_QUEUE_CELL_SPACING;
385
386 /* The history is too long: remove data that is older than */
387 /* TID_MAX_TIME_DIFF */
388 if (index >= TID_QUEUE_MAX_SIZE)
389 rs_tl_rm_old_stats(tl, curr_time);
390
391 return tl->total;
392 }
393
394 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
395 struct iwl_lq_sta *lq_data, u8 tid,
396 struct ieee80211_sta *sta)
397 {
398 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
399 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
400 sta->addr, tid);
401 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
402 }
403 }
404
405 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
406 struct iwl_lq_sta *lq_data,
407 struct ieee80211_sta *sta)
408 {
409 if ((tid < TID_MAX_LOAD_COUNT))
410 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
411 else if (tid == IWL_AGG_ALL_TID)
412 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
413 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
414 }
415
416 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
417 {
418 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
419 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
420 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
421 }
422
423 /**
424 * rs_collect_tx_data - Update the success/failure sliding window
425 *
426 * We keep a sliding window of the last 62 packets transmitted
427 * at this rate. window->data contains the bitmask of successful
428 * packets.
429 */
430 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
431 int scale_index, s32 tpt, int retries,
432 int successes)
433 {
434 struct iwl_rate_scale_data *window = NULL;
435 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
436 s32 fail_count;
437
438 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
439 return -EINVAL;
440
441 /* Select data for current tx bit rate */
442 window = &(windows[scale_index]);
443
444 /*
445 * Keep track of only the latest 62 tx frame attempts in this rate's
446 * history window; anything older isn't really relevant any more.
447 * If we have filled up the sliding window, drop the oldest attempt;
448 * if the oldest attempt (highest bit in bitmap) shows "success",
449 * subtract "1" from the success counter (this is the main reason
450 * we keep these bitmaps!).
451 */
452 while (retries > 0) {
453 if (window->counter >= IWL_RATE_MAX_WINDOW) {
454
455 /* remove earliest */
456 window->counter = IWL_RATE_MAX_WINDOW - 1;
457
458 if (window->data & mask) {
459 window->data &= ~mask;
460 window->success_counter--;
461 }
462 }
463
464 /* Increment frames-attempted counter */
465 window->counter++;
466
467 /* Shift bitmap by one frame (throw away oldest history),
468 * OR in "1", and increment "success" if this
469 * frame was successful. */
470 window->data <<= 1;
471 if (successes > 0) {
472 window->success_counter++;
473 window->data |= 0x1;
474 successes--;
475 }
476
477 retries--;
478 }
479
480 /* Calculate current success ratio, avoid divide-by-0! */
481 if (window->counter > 0)
482 window->success_ratio = 128 * (100 * window->success_counter)
483 / window->counter;
484 else
485 window->success_ratio = IWL_INVALID_VALUE;
486
487 fail_count = window->counter - window->success_counter;
488
489 /* Calculate average throughput, if we have enough history. */
490 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
491 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
492 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
493 else
494 window->average_tpt = IWL_INVALID_VALUE;
495
496 /* Tag this window as having been updated */
497 window->stamp = jiffies;
498
499 return 0;
500 }
501
502 /*
503 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
504 */
505 /* FIXME:RS:remove this function and put the flags statically in the table */
506 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
507 struct iwl_scale_tbl_info *tbl,
508 int index, u8 use_green)
509 {
510 u32 rate_n_flags = 0;
511
512 if (is_legacy(tbl->lq_type)) {
513 rate_n_flags = iwl_rates[index].plcp;
514 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
515 rate_n_flags |= RATE_MCS_CCK_MSK;
516
517 } else if (is_Ht(tbl->lq_type)) {
518 if (index > IWL_LAST_OFDM_RATE) {
519 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
520 index = IWL_LAST_OFDM_RATE;
521 }
522 rate_n_flags = RATE_MCS_HT_MSK;
523
524 if (is_siso(tbl->lq_type))
525 rate_n_flags |= iwl_rates[index].plcp_siso;
526 else if (is_mimo2(tbl->lq_type))
527 rate_n_flags |= iwl_rates[index].plcp_mimo2;
528 else
529 rate_n_flags |= iwl_rates[index].plcp_mimo3;
530 } else {
531 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
532 }
533
534 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
535 RATE_MCS_ANT_ABC_MSK);
536
537 if (is_Ht(tbl->lq_type)) {
538 if (tbl->is_fat) {
539 if (tbl->is_dup)
540 rate_n_flags |= RATE_MCS_DUP_MSK;
541 else
542 rate_n_flags |= RATE_MCS_FAT_MSK;
543 }
544 if (tbl->is_SGI)
545 rate_n_flags |= RATE_MCS_SGI_MSK;
546
547 if (use_green) {
548 rate_n_flags |= RATE_MCS_GF_MSK;
549 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
550 rate_n_flags &= ~RATE_MCS_SGI_MSK;
551 IWL_ERR(priv, "GF was set with SGI:SISO\n");
552 }
553 }
554 }
555 return rate_n_flags;
556 }
557
558 /*
559 * Interpret uCode API's rate_n_flags format,
560 * fill "search" or "active" tx mode table.
561 */
562 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
563 enum ieee80211_band band,
564 struct iwl_scale_tbl_info *tbl,
565 int *rate_idx)
566 {
567 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
568 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
569 u8 mcs;
570
571 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
572
573 if (*rate_idx == IWL_RATE_INVALID) {
574 *rate_idx = -1;
575 return -EINVAL;
576 }
577 tbl->is_SGI = 0; /* default legacy setup */
578 tbl->is_fat = 0;
579 tbl->is_dup = 0;
580 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
581 tbl->lq_type = LQ_NONE;
582
583 /* legacy rate format */
584 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
585 if (num_of_ant == 1) {
586 if (band == IEEE80211_BAND_5GHZ)
587 tbl->lq_type = LQ_A;
588 else
589 tbl->lq_type = LQ_G;
590 }
591 /* HT rate format */
592 } else {
593 if (rate_n_flags & RATE_MCS_SGI_MSK)
594 tbl->is_SGI = 1;
595
596 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
597 (rate_n_flags & RATE_MCS_DUP_MSK))
598 tbl->is_fat = 1;
599
600 if (rate_n_flags & RATE_MCS_DUP_MSK)
601 tbl->is_dup = 1;
602
603 mcs = rs_extract_rate(rate_n_flags);
604
605 /* SISO */
606 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
607 if (num_of_ant == 1)
608 tbl->lq_type = LQ_SISO; /*else NONE*/
609 /* MIMO2 */
610 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
611 if (num_of_ant == 2)
612 tbl->lq_type = LQ_MIMO2;
613 /* MIMO3 */
614 } else {
615 if (num_of_ant == 3)
616 tbl->lq_type = LQ_MIMO3;
617 }
618 }
619 return 0;
620 }
621
622 /* switch to another antenna/antennas and return 1 */
623 /* if no other valid antenna found, return 0 */
624 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
625 struct iwl_scale_tbl_info *tbl)
626 {
627 u8 new_ant_type;
628
629 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
630 return 0;
631
632 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
633 return 0;
634
635 new_ant_type = ant_toggle_lookup[tbl->ant_type];
636
637 while ((new_ant_type != tbl->ant_type) &&
638 !rs_is_valid_ant(valid_ant, new_ant_type))
639 new_ant_type = ant_toggle_lookup[new_ant_type];
640
641 if (new_ant_type == tbl->ant_type)
642 return 0;
643
644 tbl->ant_type = new_ant_type;
645 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
646 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
647 return 1;
648 }
649
650 /* FIXME:RS: in 4965 we don't use greenfield at all */
651 /* FIXME:RS: don't use greenfield for now in TX */
652 #if 0
653 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
654 {
655 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
656 priv->current_ht_config.is_green_field &&
657 !priv->current_ht_config.non_GF_STA_present;
658 }
659 #endif
660 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
661 {
662 return 0;
663 }
664
665 /**
666 * rs_get_supported_rates - get the available rates
667 *
668 * if management frame or broadcast frame only return
669 * basic available rates.
670 *
671 */
672 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
673 struct ieee80211_hdr *hdr,
674 enum iwl_table_type rate_type)
675 {
676 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
677 lq_sta->active_rate_basic)
678 return lq_sta->active_rate_basic;
679
680 if (is_legacy(rate_type)) {
681 return lq_sta->active_legacy_rate;
682 } else {
683 if (is_siso(rate_type))
684 return lq_sta->active_siso_rate;
685 else if (is_mimo2(rate_type))
686 return lq_sta->active_mimo2_rate;
687 else
688 return lq_sta->active_mimo3_rate;
689 }
690 }
691
692 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
693 int rate_type)
694 {
695 u8 high = IWL_RATE_INVALID;
696 u8 low = IWL_RATE_INVALID;
697
698 /* 802.11A or ht walks to the next literal adjacent rate in
699 * the rate table */
700 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
701 int i;
702 u32 mask;
703
704 /* Find the previous rate that is in the rate mask */
705 i = index - 1;
706 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
707 if (rate_mask & mask) {
708 low = i;
709 break;
710 }
711 }
712
713 /* Find the next rate that is in the rate mask */
714 i = index + 1;
715 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
716 if (rate_mask & mask) {
717 high = i;
718 break;
719 }
720 }
721
722 return (high << 8) | low;
723 }
724
725 low = index;
726 while (low != IWL_RATE_INVALID) {
727 low = iwl_rates[low].prev_rs;
728 if (low == IWL_RATE_INVALID)
729 break;
730 if (rate_mask & (1 << low))
731 break;
732 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
733 }
734
735 high = index;
736 while (high != IWL_RATE_INVALID) {
737 high = iwl_rates[high].next_rs;
738 if (high == IWL_RATE_INVALID)
739 break;
740 if (rate_mask & (1 << high))
741 break;
742 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
743 }
744
745 return (high << 8) | low;
746 }
747
748 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
749 struct iwl_scale_tbl_info *tbl,
750 u8 scale_index, u8 ht_possible)
751 {
752 s32 low;
753 u16 rate_mask;
754 u16 high_low;
755 u8 switch_to_legacy = 0;
756 u8 is_green = lq_sta->is_green;
757
758 /* check if we need to switch from HT to legacy rates.
759 * assumption is that mandatory rates (1Mbps or 6Mbps)
760 * are always supported (spec demand) */
761 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
762 switch_to_legacy = 1;
763 scale_index = rs_ht_to_legacy[scale_index];
764 if (lq_sta->band == IEEE80211_BAND_5GHZ)
765 tbl->lq_type = LQ_A;
766 else
767 tbl->lq_type = LQ_G;
768
769 if (num_of_ant(tbl->ant_type) > 1)
770 tbl->ant_type = ANT_A;/*FIXME:RS*/
771
772 tbl->is_fat = 0;
773 tbl->is_SGI = 0;
774 }
775
776 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
777
778 /* Mask with station rate restriction */
779 if (is_legacy(tbl->lq_type)) {
780 /* supp_rates has no CCK bits in A mode */
781 if (lq_sta->band == IEEE80211_BAND_5GHZ)
782 rate_mask = (u16)(rate_mask &
783 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
784 else
785 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
786 }
787
788 /* If we switched from HT to legacy, check current rate */
789 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
790 low = scale_index;
791 goto out;
792 }
793
794 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
795 tbl->lq_type);
796 low = high_low & 0xff;
797
798 if (low == IWL_RATE_INVALID)
799 low = scale_index;
800
801 out:
802 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
803 }
804
805 /*
806 * mac80211 sends us Tx status
807 */
808 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
809 struct ieee80211_sta *sta, void *priv_sta,
810 struct sk_buff *skb)
811 {
812 int status;
813 u8 retries;
814 int rs_index, index = 0;
815 struct iwl_lq_sta *lq_sta = priv_sta;
816 struct iwl_link_quality_cmd *table;
817 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
818 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
819 struct ieee80211_hw *hw = priv->hw;
820 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
821 struct iwl_rate_scale_data *window = NULL;
822 struct iwl_rate_scale_data *search_win = NULL;
823 u32 tx_rate;
824 struct iwl_scale_tbl_info tbl_type;
825 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
826 u8 active_index = 0;
827 s32 tpt = 0;
828
829 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
830
831 if (!ieee80211_is_data(hdr->frame_control) ||
832 info->flags & IEEE80211_TX_CTL_NO_ACK)
833 return;
834
835 /* This packet was aggregated but doesn't carry rate scale info */
836 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
837 !(info->flags & IEEE80211_TX_STAT_AMPDU))
838 return;
839
840 if (info->flags & IEEE80211_TX_STAT_AMPDU)
841 retries = 0;
842 else
843 retries = info->status.rates[0].count - 1;
844
845 if (retries > 15)
846 retries = 15;
847
848 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
849 !lq_sta->ibss_sta_added)
850 goto out;
851
852 table = &lq_sta->lq;
853 active_index = lq_sta->active_tbl;
854
855 curr_tbl = &(lq_sta->lq_info[active_index]);
856 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
857 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
858 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
859
860 /*
861 * Ignore this Tx frame response if its initial rate doesn't match
862 * that of latest Link Quality command. There may be stragglers
863 * from a previous Link Quality command, but we're no longer interested
864 * in those; they're either from the "active" mode while we're trying
865 * to check "search" mode, or a prior "search" mode after we've moved
866 * to a new "search" mode (which might become the new "active" mode).
867 */
868 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
869 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
870 if (priv->band == IEEE80211_BAND_5GHZ)
871 rs_index -= IWL_FIRST_OFDM_RATE;
872
873 if ((info->status.rates[0].idx < 0) ||
874 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
875 (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
876 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
877 (tbl_type.ant_type != info->antenna_sel_tx) ||
878 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
879 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
880 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
881 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
882 IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate);
883 /* the last LQ command could failed so the LQ in ucode not
884 * the same in driver sync up
885 */
886 lq_sta->missed_rate_counter++;
887 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
888 lq_sta->missed_rate_counter = 0;
889 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
890 }
891 goto out;
892 }
893
894 lq_sta->missed_rate_counter = 0;
895 /* Update frame history window with "failure" for each Tx retry. */
896 while (retries) {
897 /* Look up the rate and other info used for each tx attempt.
898 * Each tx attempt steps one entry deeper in the rate table. */
899 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
900 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
901 &tbl_type, &rs_index);
902
903 /* If type matches "search" table,
904 * add failure to "search" history */
905 if ((tbl_type.lq_type == search_tbl->lq_type) &&
906 (tbl_type.ant_type == search_tbl->ant_type) &&
907 (tbl_type.is_SGI == search_tbl->is_SGI)) {
908 if (search_tbl->expected_tpt)
909 tpt = search_tbl->expected_tpt[rs_index];
910 else
911 tpt = 0;
912 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
913
914 /* Else if type matches "current/active" table,
915 * add failure to "current/active" history */
916 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
917 (tbl_type.ant_type == curr_tbl->ant_type) &&
918 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
919 if (curr_tbl->expected_tpt)
920 tpt = curr_tbl->expected_tpt[rs_index];
921 else
922 tpt = 0;
923 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
924 }
925
926 /* If not searching for a new mode, increment failed counter
927 * ... this helps determine when to start searching again */
928 if (lq_sta->stay_in_tbl)
929 lq_sta->total_failed++;
930 --retries;
931 index++;
932
933 }
934
935 /*
936 * Find (by rate) the history window to update with final Tx attempt;
937 * if Tx was successful first try, use original rate,
938 * else look up the rate that was, finally, successful.
939 */
940 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
941 lq_sta->last_rate_n_flags = tx_rate;
942 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
943
944 /* Update frame history window with "success" if Tx got ACKed ... */
945 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
946
947 /* If type matches "search" table,
948 * add final tx status to "search" history */
949 if ((tbl_type.lq_type == search_tbl->lq_type) &&
950 (tbl_type.ant_type == search_tbl->ant_type) &&
951 (tbl_type.is_SGI == search_tbl->is_SGI)) {
952 if (search_tbl->expected_tpt)
953 tpt = search_tbl->expected_tpt[rs_index];
954 else
955 tpt = 0;
956 if (info->flags & IEEE80211_TX_STAT_AMPDU)
957 rs_collect_tx_data(search_win, rs_index, tpt,
958 info->status.ampdu_ack_len,
959 info->status.ampdu_ack_map);
960 else
961 rs_collect_tx_data(search_win, rs_index, tpt,
962 1, status);
963 /* Else if type matches "current/active" table,
964 * add final tx status to "current/active" history */
965 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
966 (tbl_type.ant_type == curr_tbl->ant_type) &&
967 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
968 if (curr_tbl->expected_tpt)
969 tpt = curr_tbl->expected_tpt[rs_index];
970 else
971 tpt = 0;
972 if (info->flags & IEEE80211_TX_STAT_AMPDU)
973 rs_collect_tx_data(window, rs_index, tpt,
974 info->status.ampdu_ack_len,
975 info->status.ampdu_ack_map);
976 else
977 rs_collect_tx_data(window, rs_index, tpt,
978 1, status);
979 }
980
981 /* If not searching for new mode, increment success/failed counter
982 * ... these help determine when to start searching again */
983 if (lq_sta->stay_in_tbl) {
984 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
985 lq_sta->total_success += info->status.ampdu_ack_map;
986 lq_sta->total_failed +=
987 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
988 } else {
989 if (status)
990 lq_sta->total_success++;
991 else
992 lq_sta->total_failed++;
993 }
994 }
995
996 /* See if there's a better rate or modulation mode to try. */
997 if (sta && sta->supp_rates[sband->band])
998 rs_rate_scale_perform(priv, skb, sta, lq_sta);
999 out:
1000 return;
1001 }
1002
1003 /*
1004 * Begin a period of staying with a selected modulation mode.
1005 * Set "stay_in_tbl" flag to prevent any mode switches.
1006 * Set frame tx success limits according to legacy vs. high-throughput,
1007 * and reset overall (spanning all rates) tx success history statistics.
1008 * These control how long we stay using same modulation mode before
1009 * searching for a new mode.
1010 */
1011 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1012 struct iwl_lq_sta *lq_sta)
1013 {
1014 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1015 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1016 if (is_legacy) {
1017 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1018 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1019 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1020 } else {
1021 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1022 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1023 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1024 }
1025 lq_sta->table_count = 0;
1026 lq_sta->total_failed = 0;
1027 lq_sta->total_success = 0;
1028 lq_sta->flush_timer = jiffies;
1029 }
1030
1031 /*
1032 * Find correct throughput table for given mode of modulation
1033 */
1034 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1035 struct iwl_scale_tbl_info *tbl)
1036 {
1037 if (is_legacy(tbl->lq_type)) {
1038 if (!is_a_band(tbl->lq_type))
1039 tbl->expected_tpt = expected_tpt_G;
1040 else
1041 tbl->expected_tpt = expected_tpt_A;
1042 } else if (is_siso(tbl->lq_type)) {
1043 if (tbl->is_fat && !lq_sta->is_dup)
1044 if (tbl->is_SGI)
1045 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1046 else
1047 tbl->expected_tpt = expected_tpt_siso40MHz;
1048 else if (tbl->is_SGI)
1049 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1050 else
1051 tbl->expected_tpt = expected_tpt_siso20MHz;
1052 } else if (is_mimo2(tbl->lq_type)) {
1053 if (tbl->is_fat && !lq_sta->is_dup)
1054 if (tbl->is_SGI)
1055 tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
1056 else
1057 tbl->expected_tpt = expected_tpt_mimo2_40MHz;
1058 else if (tbl->is_SGI)
1059 tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
1060 else
1061 tbl->expected_tpt = expected_tpt_mimo2_20MHz;
1062 } else if (is_mimo3(tbl->lq_type)) {
1063 if (tbl->is_fat && !lq_sta->is_dup)
1064 if (tbl->is_SGI)
1065 tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
1066 else
1067 tbl->expected_tpt = expected_tpt_mimo3_40MHz;
1068 else if (tbl->is_SGI)
1069 tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
1070 else
1071 tbl->expected_tpt = expected_tpt_mimo3_20MHz;
1072 } else
1073 tbl->expected_tpt = expected_tpt_G;
1074 }
1075
1076 /*
1077 * Find starting rate for new "search" high-throughput mode of modulation.
1078 * Goal is to find lowest expected rate (under perfect conditions) that is
1079 * above the current measured throughput of "active" mode, to give new mode
1080 * a fair chance to prove itself without too many challenges.
1081 *
1082 * This gets called when transitioning to more aggressive modulation
1083 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1084 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1085 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1086 * bit rate will typically need to increase, but not if performance was bad.
1087 */
1088 static s32 rs_get_best_rate(struct iwl_priv *priv,
1089 struct iwl_lq_sta *lq_sta,
1090 struct iwl_scale_tbl_info *tbl, /* "search" */
1091 u16 rate_mask, s8 index)
1092 {
1093 /* "active" values */
1094 struct iwl_scale_tbl_info *active_tbl =
1095 &(lq_sta->lq_info[lq_sta->active_tbl]);
1096 s32 active_sr = active_tbl->win[index].success_ratio;
1097 s32 active_tpt = active_tbl->expected_tpt[index];
1098
1099 /* expected "search" throughput */
1100 s32 *tpt_tbl = tbl->expected_tpt;
1101
1102 s32 new_rate, high, low, start_hi;
1103 u16 high_low;
1104 s8 rate = index;
1105
1106 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1107
1108 for (; ;) {
1109 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1110 tbl->lq_type);
1111
1112 low = high_low & 0xff;
1113 high = (high_low >> 8) & 0xff;
1114
1115 /*
1116 * Lower the "search" bit rate, to give new "search" mode
1117 * approximately the same throughput as "active" if:
1118 *
1119 * 1) "Active" mode has been working modestly well (but not
1120 * great), and expected "search" throughput (under perfect
1121 * conditions) at candidate rate is above the actual
1122 * measured "active" throughput (but less than expected
1123 * "active" throughput under perfect conditions).
1124 * OR
1125 * 2) "Active" mode has been working perfectly or very well
1126 * and expected "search" throughput (under perfect
1127 * conditions) at candidate rate is above expected
1128 * "active" throughput (under perfect conditions).
1129 */
1130 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1131 ((active_sr > IWL_RATE_DECREASE_TH) &&
1132 (active_sr <= IWL_RATE_HIGH_TH) &&
1133 (tpt_tbl[rate] <= active_tpt))) ||
1134 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1135 (tpt_tbl[rate] > active_tpt))) {
1136
1137 /* (2nd or later pass)
1138 * If we've already tried to raise the rate, and are
1139 * now trying to lower it, use the higher rate. */
1140 if (start_hi != IWL_RATE_INVALID) {
1141 new_rate = start_hi;
1142 break;
1143 }
1144
1145 new_rate = rate;
1146
1147 /* Loop again with lower rate */
1148 if (low != IWL_RATE_INVALID)
1149 rate = low;
1150
1151 /* Lower rate not available, use the original */
1152 else
1153 break;
1154
1155 /* Else try to raise the "search" rate to match "active" */
1156 } else {
1157 /* (2nd or later pass)
1158 * If we've already tried to lower the rate, and are
1159 * now trying to raise it, use the lower rate. */
1160 if (new_rate != IWL_RATE_INVALID)
1161 break;
1162
1163 /* Loop again with higher rate */
1164 else if (high != IWL_RATE_INVALID) {
1165 start_hi = high;
1166 rate = high;
1167
1168 /* Higher rate not available, use the original */
1169 } else {
1170 new_rate = rate;
1171 break;
1172 }
1173 }
1174 }
1175
1176 return new_rate;
1177 }
1178
1179 /*
1180 * Set up search table for MIMO2
1181 */
1182 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1183 struct iwl_lq_sta *lq_sta,
1184 struct ieee80211_conf *conf,
1185 struct ieee80211_sta *sta,
1186 struct iwl_scale_tbl_info *tbl, int index)
1187 {
1188 u16 rate_mask;
1189 s32 rate;
1190 s8 is_green = lq_sta->is_green;
1191
1192 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1193 return -1;
1194
1195 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1196 == WLAN_HT_CAP_SM_PS_STATIC)
1197 return -1;
1198
1199 /* Need both Tx chains/antennas to support MIMO */
1200 if (priv->hw_params.tx_chains_num < 2)
1201 return -1;
1202
1203 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1204
1205 tbl->lq_type = LQ_MIMO2;
1206 tbl->is_dup = lq_sta->is_dup;
1207 tbl->action = 0;
1208 rate_mask = lq_sta->active_mimo2_rate;
1209
1210 if (priv->current_ht_config.supported_chan_width
1211 == IWL_CHANNEL_WIDTH_40MHZ)
1212 tbl->is_fat = 1;
1213 else
1214 tbl->is_fat = 0;
1215
1216 /* FIXME: - don't toggle SGI here
1217 if (tbl->is_fat) {
1218 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1219 tbl->is_SGI = 1;
1220 else
1221 tbl->is_SGI = 0;
1222 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1223 tbl->is_SGI = 1;
1224 else
1225 tbl->is_SGI = 0;
1226 */
1227
1228 rs_set_expected_tpt_table(lq_sta, tbl);
1229
1230 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1231
1232 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1233 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1234 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1235 rate, rate_mask);
1236 return -1;
1237 }
1238 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1239
1240 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1241 tbl->current_rate, is_green);
1242 return 0;
1243 }
1244
1245 /*
1246 * Set up search table for MIMO3
1247 */
1248 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1249 struct iwl_lq_sta *lq_sta,
1250 struct ieee80211_conf *conf,
1251 struct ieee80211_sta *sta,
1252 struct iwl_scale_tbl_info *tbl, int index)
1253 {
1254 u16 rate_mask;
1255 s32 rate;
1256 s8 is_green = lq_sta->is_green;
1257
1258 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1259 return -1;
1260
1261 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1262 == WLAN_HT_CAP_SM_PS_STATIC)
1263 return -1;
1264
1265 /* Need both Tx chains/antennas to support MIMO */
1266 if (priv->hw_params.tx_chains_num < 3)
1267 return -1;
1268
1269 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1270
1271 tbl->lq_type = LQ_MIMO3;
1272 tbl->is_dup = lq_sta->is_dup;
1273 tbl->action = 0;
1274 rate_mask = lq_sta->active_mimo3_rate;
1275
1276 if (priv->current_ht_config.supported_chan_width
1277 == IWL_CHANNEL_WIDTH_40MHZ)
1278 tbl->is_fat = 1;
1279 else
1280 tbl->is_fat = 0;
1281
1282 /* FIXME: - don't toggle SGI here
1283 if (tbl->is_fat) {
1284 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1285 tbl->is_SGI = 1;
1286 else
1287 tbl->is_SGI = 0;
1288 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1289 tbl->is_SGI = 1;
1290 else
1291 tbl->is_SGI = 0;
1292 */
1293
1294 rs_set_expected_tpt_table(lq_sta, tbl);
1295
1296 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1297
1298 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1299 rate, rate_mask);
1300 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1301 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1302 rate, rate_mask);
1303 return -1;
1304 }
1305 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1306
1307 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1308 tbl->current_rate, is_green);
1309 return 0;
1310 }
1311
1312 /*
1313 * Set up search table for SISO
1314 */
1315 static int rs_switch_to_siso(struct iwl_priv *priv,
1316 struct iwl_lq_sta *lq_sta,
1317 struct ieee80211_conf *conf,
1318 struct ieee80211_sta *sta,
1319 struct iwl_scale_tbl_info *tbl, int index)
1320 {
1321 u16 rate_mask;
1322 u8 is_green = lq_sta->is_green;
1323 s32 rate;
1324
1325 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1326 return -1;
1327
1328 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1329
1330 tbl->is_dup = lq_sta->is_dup;
1331 tbl->lq_type = LQ_SISO;
1332 tbl->action = 0;
1333 rate_mask = lq_sta->active_siso_rate;
1334
1335 if (priv->current_ht_config.supported_chan_width
1336 == IWL_CHANNEL_WIDTH_40MHZ)
1337 tbl->is_fat = 1;
1338 else
1339 tbl->is_fat = 0;
1340
1341 /* FIXME: - don't toggle SGI here
1342 if (tbl->is_fat) {
1343 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1344 tbl->is_SGI = 1;
1345 else
1346 tbl->is_SGI = 0;
1347 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1348 tbl->is_SGI = 1;
1349 else
1350 tbl->is_SGI = 0;
1351 */
1352
1353 if (is_green)
1354 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1355
1356 rs_set_expected_tpt_table(lq_sta, tbl);
1357 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1358
1359 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1360 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1361 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1362 rate, rate_mask);
1363 return -1;
1364 }
1365 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1366 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1367 tbl->current_rate, is_green);
1368 return 0;
1369 }
1370
1371 /*
1372 * Try to switch to new modulation mode from legacy
1373 */
1374 static int rs_move_legacy_other(struct iwl_priv *priv,
1375 struct iwl_lq_sta *lq_sta,
1376 struct ieee80211_conf *conf,
1377 struct ieee80211_sta *sta,
1378 int index)
1379 {
1380 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1381 struct iwl_scale_tbl_info *search_tbl =
1382 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1383 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1384 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1385 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1386 u8 start_action = tbl->action;
1387 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1388 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1389 int ret = 0;
1390
1391 for (; ;) {
1392 switch (tbl->action) {
1393 case IWL_LEGACY_SWITCH_ANTENNA1:
1394 case IWL_LEGACY_SWITCH_ANTENNA2:
1395 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1396
1397 lq_sta->action_counter++;
1398
1399 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1400 tx_chains_num <= 1) ||
1401 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1402 tx_chains_num <= 2))
1403 break;
1404
1405 /* Don't change antenna if success has been great */
1406 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1407 break;
1408
1409 /* Set up search table to try other antenna */
1410 memcpy(search_tbl, tbl, sz);
1411
1412 if (rs_toggle_antenna(valid_tx_ant,
1413 &search_tbl->current_rate, search_tbl)) {
1414 rs_set_expected_tpt_table(lq_sta, search_tbl);
1415 goto out;
1416 }
1417 break;
1418 case IWL_LEGACY_SWITCH_SISO:
1419 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1420
1421 /* Set up search table to try SISO */
1422 memcpy(search_tbl, tbl, sz);
1423 search_tbl->is_SGI = 0;
1424 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1425 search_tbl, index);
1426 if (!ret) {
1427 lq_sta->action_counter = 0;
1428 goto out;
1429 }
1430
1431 break;
1432 case IWL_LEGACY_SWITCH_MIMO2_AB:
1433 case IWL_LEGACY_SWITCH_MIMO2_AC:
1434 case IWL_LEGACY_SWITCH_MIMO2_BC:
1435 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1436
1437 /* Set up search table to try MIMO */
1438 memcpy(search_tbl, tbl, sz);
1439 search_tbl->is_SGI = 0;
1440
1441 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1442 search_tbl->ant_type = ANT_AB;
1443 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1444 search_tbl->ant_type = ANT_AC;
1445 else
1446 search_tbl->ant_type = ANT_BC;
1447
1448 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1449 break;
1450
1451 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1452 search_tbl, index);
1453 if (!ret) {
1454 lq_sta->action_counter = 0;
1455 goto out;
1456 }
1457 break;
1458
1459 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1460 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1461
1462 /* Set up search table to try MIMO3 */
1463 memcpy(search_tbl, tbl, sz);
1464 search_tbl->is_SGI = 0;
1465
1466 search_tbl->ant_type = ANT_ABC;
1467
1468 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1469 break;
1470
1471 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1472 search_tbl, index);
1473 if (!ret) {
1474 lq_sta->action_counter = 0;
1475 goto out;
1476 }
1477 break;
1478 }
1479 tbl->action++;
1480 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1481 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1482
1483 if (tbl->action == start_action)
1484 break;
1485
1486 }
1487 search_tbl->lq_type = LQ_NONE;
1488 return 0;
1489
1490 out:
1491 lq_sta->search_better_tbl = 1;
1492 tbl->action++;
1493 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1494 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1495 return 0;
1496
1497 }
1498
1499 /*
1500 * Try to switch to new modulation mode from SISO
1501 */
1502 static int rs_move_siso_to_other(struct iwl_priv *priv,
1503 struct iwl_lq_sta *lq_sta,
1504 struct ieee80211_conf *conf,
1505 struct ieee80211_sta *sta, int index)
1506 {
1507 u8 is_green = lq_sta->is_green;
1508 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1509 struct iwl_scale_tbl_info *search_tbl =
1510 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1511 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1512 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1513 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1514 u8 start_action = tbl->action;
1515 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1516 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1517 int ret;
1518
1519 for (;;) {
1520 lq_sta->action_counter++;
1521 switch (tbl->action) {
1522 case IWL_SISO_SWITCH_ANTENNA1:
1523 case IWL_SISO_SWITCH_ANTENNA2:
1524 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1525
1526 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1527 tx_chains_num <= 1) ||
1528 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1529 tx_chains_num <= 2))
1530 break;
1531
1532 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1533 break;
1534
1535 memcpy(search_tbl, tbl, sz);
1536 if (rs_toggle_antenna(valid_tx_ant,
1537 &search_tbl->current_rate, search_tbl))
1538 goto out;
1539 break;
1540 case IWL_SISO_SWITCH_MIMO2_AB:
1541 case IWL_SISO_SWITCH_MIMO2_AC:
1542 case IWL_SISO_SWITCH_MIMO2_BC:
1543 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1544 memcpy(search_tbl, tbl, sz);
1545 search_tbl->is_SGI = 0;
1546
1547 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1548 search_tbl->ant_type = ANT_AB;
1549 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1550 search_tbl->ant_type = ANT_AC;
1551 else
1552 search_tbl->ant_type = ANT_BC;
1553
1554 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1555 break;
1556
1557 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1558 search_tbl, index);
1559 if (!ret)
1560 goto out;
1561 break;
1562 case IWL_SISO_SWITCH_GI:
1563 if (!tbl->is_fat &&
1564 !(priv->current_ht_config.sgf &
1565 HT_SHORT_GI_20MHZ))
1566 break;
1567 if (tbl->is_fat &&
1568 !(priv->current_ht_config.sgf &
1569 HT_SHORT_GI_40MHZ))
1570 break;
1571
1572 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1573
1574 memcpy(search_tbl, tbl, sz);
1575 if (is_green) {
1576 if (!tbl->is_SGI)
1577 break;
1578 else
1579 IWL_ERR(priv,
1580 "SGI was set in GF+SISO\n");
1581 }
1582 search_tbl->is_SGI = !tbl->is_SGI;
1583 rs_set_expected_tpt_table(lq_sta, search_tbl);
1584 if (tbl->is_SGI) {
1585 s32 tpt = lq_sta->last_tpt / 100;
1586 if (tpt >= search_tbl->expected_tpt[index])
1587 break;
1588 }
1589 search_tbl->current_rate =
1590 rate_n_flags_from_tbl(priv, search_tbl,
1591 index, is_green);
1592 goto out;
1593 case IWL_SISO_SWITCH_MIMO3_ABC:
1594 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1595 memcpy(search_tbl, tbl, sz);
1596 search_tbl->is_SGI = 0;
1597 search_tbl->ant_type = ANT_ABC;
1598
1599 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1600 break;
1601
1602 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1603 search_tbl, index);
1604 if (!ret)
1605 goto out;
1606 break;
1607 }
1608 tbl->action++;
1609 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1610 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1611
1612 if (tbl->action == start_action)
1613 break;
1614 }
1615 search_tbl->lq_type = LQ_NONE;
1616 return 0;
1617
1618 out:
1619 lq_sta->search_better_tbl = 1;
1620 tbl->action++;
1621 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1622 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1623 return 0;
1624 }
1625
1626 /*
1627 * Try to switch to new modulation mode from MIMO2
1628 */
1629 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1630 struct iwl_lq_sta *lq_sta,
1631 struct ieee80211_conf *conf,
1632 struct ieee80211_sta *sta, int index)
1633 {
1634 s8 is_green = lq_sta->is_green;
1635 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1636 struct iwl_scale_tbl_info *search_tbl =
1637 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1638 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1639 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1640 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1641 u8 start_action = tbl->action;
1642 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1643 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1644 int ret;
1645
1646 for (;;) {
1647 lq_sta->action_counter++;
1648 switch (tbl->action) {
1649 case IWL_MIMO2_SWITCH_ANTENNA1:
1650 case IWL_MIMO2_SWITCH_ANTENNA2:
1651 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1652
1653 if (tx_chains_num <= 2)
1654 break;
1655
1656 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1657 break;
1658
1659 memcpy(search_tbl, tbl, sz);
1660 if (rs_toggle_antenna(valid_tx_ant,
1661 &search_tbl->current_rate, search_tbl))
1662 goto out;
1663 break;
1664 case IWL_MIMO2_SWITCH_SISO_A:
1665 case IWL_MIMO2_SWITCH_SISO_B:
1666 case IWL_MIMO2_SWITCH_SISO_C:
1667 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1668
1669 /* Set up new search table for SISO */
1670 memcpy(search_tbl, tbl, sz);
1671
1672 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1673 search_tbl->ant_type = ANT_A;
1674 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1675 search_tbl->ant_type = ANT_B;
1676 else
1677 search_tbl->ant_type = ANT_C;
1678
1679 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1680 break;
1681
1682 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1683 search_tbl, index);
1684 if (!ret)
1685 goto out;
1686
1687 break;
1688
1689 case IWL_MIMO2_SWITCH_GI:
1690 if (!tbl->is_fat &&
1691 !(priv->current_ht_config.sgf &
1692 HT_SHORT_GI_20MHZ))
1693 break;
1694 if (tbl->is_fat &&
1695 !(priv->current_ht_config.sgf &
1696 HT_SHORT_GI_40MHZ))
1697 break;
1698
1699 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1700
1701 /* Set up new search table for MIMO2 */
1702 memcpy(search_tbl, tbl, sz);
1703 search_tbl->is_SGI = !tbl->is_SGI;
1704 rs_set_expected_tpt_table(lq_sta, search_tbl);
1705 /*
1706 * If active table already uses the fastest possible
1707 * modulation (dual stream with short guard interval),
1708 * and it's working well, there's no need to look
1709 * for a better type of modulation!
1710 */
1711 if (tbl->is_SGI) {
1712 s32 tpt = lq_sta->last_tpt / 100;
1713 if (tpt >= search_tbl->expected_tpt[index])
1714 break;
1715 }
1716 search_tbl->current_rate =
1717 rate_n_flags_from_tbl(priv, search_tbl,
1718 index, is_green);
1719 goto out;
1720
1721 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1722 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1723 memcpy(search_tbl, tbl, sz);
1724 search_tbl->is_SGI = 0;
1725 search_tbl->ant_type = ANT_ABC;
1726
1727 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1728 break;
1729
1730 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1731 search_tbl, index);
1732 if (!ret)
1733 goto out;
1734
1735 break;
1736 }
1737 tbl->action++;
1738 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1739 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1740
1741 if (tbl->action == start_action)
1742 break;
1743 }
1744 search_tbl->lq_type = LQ_NONE;
1745 return 0;
1746 out:
1747 lq_sta->search_better_tbl = 1;
1748 tbl->action++;
1749 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1750 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1751 return 0;
1752
1753 }
1754
1755 /*
1756 * Try to switch to new modulation mode from MIMO3
1757 */
1758 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1759 struct iwl_lq_sta *lq_sta,
1760 struct ieee80211_conf *conf,
1761 struct ieee80211_sta *sta, int index)
1762 {
1763 s8 is_green = lq_sta->is_green;
1764 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1765 struct iwl_scale_tbl_info *search_tbl =
1766 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1767 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1768 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1769 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1770 u8 start_action = tbl->action;
1771 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1772 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1773 int ret;
1774
1775 for (;;) {
1776 lq_sta->action_counter++;
1777 switch (tbl->action) {
1778 case IWL_MIMO3_SWITCH_ANTENNA1:
1779 case IWL_MIMO3_SWITCH_ANTENNA2:
1780 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1781
1782 if (tx_chains_num <= 3)
1783 break;
1784
1785 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1786 break;
1787
1788 memcpy(search_tbl, tbl, sz);
1789 if (rs_toggle_antenna(valid_tx_ant,
1790 &search_tbl->current_rate, search_tbl))
1791 goto out;
1792 break;
1793 case IWL_MIMO3_SWITCH_SISO_A:
1794 case IWL_MIMO3_SWITCH_SISO_B:
1795 case IWL_MIMO3_SWITCH_SISO_C:
1796 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1797
1798 /* Set up new search table for SISO */
1799 memcpy(search_tbl, tbl, sz);
1800
1801 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1802 search_tbl->ant_type = ANT_A;
1803 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1804 search_tbl->ant_type = ANT_B;
1805 else
1806 search_tbl->ant_type = ANT_C;
1807
1808 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1809 break;
1810
1811 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1812 search_tbl, index);
1813 if (!ret)
1814 goto out;
1815
1816 break;
1817
1818 case IWL_MIMO3_SWITCH_MIMO2_AB:
1819 case IWL_MIMO3_SWITCH_MIMO2_AC:
1820 case IWL_MIMO3_SWITCH_MIMO2_BC:
1821 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1822
1823 memcpy(search_tbl, tbl, sz);
1824 search_tbl->is_SGI = 0;
1825 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1826 search_tbl->ant_type = ANT_AB;
1827 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1828 search_tbl->ant_type = ANT_AC;
1829 else
1830 search_tbl->ant_type = ANT_BC;
1831
1832 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1833 break;
1834
1835 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1836 search_tbl, index);
1837 if (!ret)
1838 goto out;
1839
1840 break;
1841
1842 case IWL_MIMO3_SWITCH_GI:
1843 if (!tbl->is_fat &&
1844 !(priv->current_ht_config.sgf &
1845 HT_SHORT_GI_20MHZ))
1846 break;
1847 if (tbl->is_fat &&
1848 !(priv->current_ht_config.sgf &
1849 HT_SHORT_GI_40MHZ))
1850 break;
1851
1852 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1853
1854 /* Set up new search table for MIMO */
1855 memcpy(search_tbl, tbl, sz);
1856 search_tbl->is_SGI = !tbl->is_SGI;
1857 rs_set_expected_tpt_table(lq_sta, search_tbl);
1858 /*
1859 * If active table already uses the fastest possible
1860 * modulation (dual stream with short guard interval),
1861 * and it's working well, there's no need to look
1862 * for a better type of modulation!
1863 */
1864 if (tbl->is_SGI) {
1865 s32 tpt = lq_sta->last_tpt / 100;
1866 if (tpt >= search_tbl->expected_tpt[index])
1867 break;
1868 }
1869 search_tbl->current_rate =
1870 rate_n_flags_from_tbl(priv, search_tbl,
1871 index, is_green);
1872 goto out;
1873 }
1874 tbl->action++;
1875 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1876 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1877
1878 if (tbl->action == start_action)
1879 break;
1880 }
1881 search_tbl->lq_type = LQ_NONE;
1882 return 0;
1883 out:
1884 lq_sta->search_better_tbl = 1;
1885 tbl->action++;
1886 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1887 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1888 return 0;
1889
1890 }
1891
1892 /*
1893 * Check whether we should continue using same modulation mode, or
1894 * begin search for a new mode, based on:
1895 * 1) # tx successes or failures while using this mode
1896 * 2) # times calling this function
1897 * 3) elapsed time in this mode (not used, for now)
1898 */
1899 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1900 {
1901 struct iwl_scale_tbl_info *tbl;
1902 int i;
1903 int active_tbl;
1904 int flush_interval_passed = 0;
1905 struct iwl_priv *priv;
1906
1907 priv = lq_sta->drv;
1908 active_tbl = lq_sta->active_tbl;
1909
1910 tbl = &(lq_sta->lq_info[active_tbl]);
1911
1912 /* If we've been disallowing search, see if we should now allow it */
1913 if (lq_sta->stay_in_tbl) {
1914
1915 /* Elapsed time using current modulation mode */
1916 if (lq_sta->flush_timer)
1917 flush_interval_passed =
1918 time_after(jiffies,
1919 (unsigned long)(lq_sta->flush_timer +
1920 IWL_RATE_SCALE_FLUSH_INTVL));
1921
1922 /*
1923 * Check if we should allow search for new modulation mode.
1924 * If many frames have failed or succeeded, or we've used
1925 * this same modulation for a long time, allow search, and
1926 * reset history stats that keep track of whether we should
1927 * allow a new search. Also (below) reset all bitmaps and
1928 * stats in active history.
1929 */
1930 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1931 (lq_sta->total_success > lq_sta->max_success_limit) ||
1932 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1933 && (flush_interval_passed))) {
1934 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1935 lq_sta->total_failed,
1936 lq_sta->total_success,
1937 flush_interval_passed);
1938
1939 /* Allow search for new mode */
1940 lq_sta->stay_in_tbl = 0; /* only place reset */
1941 lq_sta->total_failed = 0;
1942 lq_sta->total_success = 0;
1943 lq_sta->flush_timer = 0;
1944
1945 /*
1946 * Else if we've used this modulation mode enough repetitions
1947 * (regardless of elapsed time or success/failure), reset
1948 * history bitmaps and rate-specific stats for all rates in
1949 * active table.
1950 */
1951 } else {
1952 lq_sta->table_count++;
1953 if (lq_sta->table_count >=
1954 lq_sta->table_count_limit) {
1955 lq_sta->table_count = 0;
1956
1957 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1958 for (i = 0; i < IWL_RATE_COUNT; i++)
1959 rs_rate_scale_clear_window(
1960 &(tbl->win[i]));
1961 }
1962 }
1963
1964 /* If transitioning to allow "search", reset all history
1965 * bitmaps and stats in active table (this will become the new
1966 * "search" table). */
1967 if (!lq_sta->stay_in_tbl) {
1968 for (i = 0; i < IWL_RATE_COUNT; i++)
1969 rs_rate_scale_clear_window(&(tbl->win[i]));
1970 }
1971 }
1972 }
1973
1974 /*
1975 * Do rate scaling and search for new modulation mode.
1976 */
1977 static void rs_rate_scale_perform(struct iwl_priv *priv,
1978 struct sk_buff *skb,
1979 struct ieee80211_sta *sta,
1980 struct iwl_lq_sta *lq_sta)
1981 {
1982 struct ieee80211_hw *hw = priv->hw;
1983 struct ieee80211_conf *conf = &hw->conf;
1984 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1985 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1986 int low = IWL_RATE_INVALID;
1987 int high = IWL_RATE_INVALID;
1988 int index;
1989 int i;
1990 struct iwl_rate_scale_data *window = NULL;
1991 int current_tpt = IWL_INVALID_VALUE;
1992 int low_tpt = IWL_INVALID_VALUE;
1993 int high_tpt = IWL_INVALID_VALUE;
1994 u32 fail_count;
1995 s8 scale_action = 0;
1996 u16 rate_mask;
1997 u8 update_lq = 0;
1998 struct iwl_scale_tbl_info *tbl, *tbl1;
1999 u16 rate_scale_index_msk = 0;
2000 u32 rate;
2001 u8 is_green = 0;
2002 u8 active_tbl = 0;
2003 u8 done_search = 0;
2004 u16 high_low;
2005 s32 sr;
2006 u8 tid = MAX_TID_COUNT;
2007 struct iwl_tid_data *tid_data;
2008
2009 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2010
2011 /* Send management frames and NO_ACK data using lowest rate. */
2012 /* TODO: this could probably be improved.. */
2013 if (!ieee80211_is_data(hdr->frame_control) ||
2014 info->flags & IEEE80211_TX_CTL_NO_ACK)
2015 return;
2016
2017 if (!sta || !lq_sta)
2018 return;
2019
2020 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2021
2022 tid = rs_tl_add_packet(lq_sta, hdr);
2023
2024 /*
2025 * Select rate-scale / modulation-mode table to work with in
2026 * the rest of this function: "search" if searching for better
2027 * modulation mode, or "active" if doing rate scaling within a mode.
2028 */
2029 if (!lq_sta->search_better_tbl)
2030 active_tbl = lq_sta->active_tbl;
2031 else
2032 active_tbl = 1 - lq_sta->active_tbl;
2033
2034 tbl = &(lq_sta->lq_info[active_tbl]);
2035 is_green = lq_sta->is_green;
2036
2037 /* current tx rate */
2038 index = lq_sta->last_txrate_idx;
2039
2040 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2041 tbl->lq_type);
2042
2043 /* rates available for this association, and for modulation mode */
2044 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2045
2046 IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask);
2047
2048 /* mask with station rate restriction */
2049 if (is_legacy(tbl->lq_type)) {
2050 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2051 /* supp_rates has no CCK bits in A mode */
2052 rate_scale_index_msk = (u16) (rate_mask &
2053 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2054 else
2055 rate_scale_index_msk = (u16) (rate_mask &
2056 lq_sta->supp_rates);
2057
2058 } else
2059 rate_scale_index_msk = rate_mask;
2060
2061 if (!rate_scale_index_msk)
2062 rate_scale_index_msk = rate_mask;
2063
2064 if (!((1 << index) & rate_scale_index_msk)) {
2065 IWL_ERR(priv, "Current Rate is not valid\n");
2066 return;
2067 }
2068
2069 /* Get expected throughput table and history window for current rate */
2070 if (!tbl->expected_tpt) {
2071 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2072 return;
2073 }
2074
2075 /* force user max rate if set by user */
2076 if ((lq_sta->max_rate_idx != -1) &&
2077 (lq_sta->max_rate_idx < index)) {
2078 index = lq_sta->max_rate_idx;
2079 update_lq = 1;
2080 window = &(tbl->win[index]);
2081 goto lq_update;
2082 }
2083
2084 window = &(tbl->win[index]);
2085
2086 /*
2087 * If there is not enough history to calculate actual average
2088 * throughput, keep analyzing results of more tx frames, without
2089 * changing rate or mode (bypass most of the rest of this function).
2090 * Set up new rate table in uCode only if old rate is not supported
2091 * in current association (use new rate found above).
2092 */
2093 fail_count = window->counter - window->success_counter;
2094 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2095 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2096 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2097 "for index %d\n",
2098 window->success_counter, window->counter, index);
2099
2100 /* Can't calculate this yet; not enough history */
2101 window->average_tpt = IWL_INVALID_VALUE;
2102
2103 /* Should we stay with this modulation mode,
2104 * or search for a new one? */
2105 rs_stay_in_table(lq_sta);
2106
2107 goto out;
2108 }
2109
2110 /* Else we have enough samples; calculate estimate of
2111 * actual average throughput */
2112
2113 BUG_ON(window->average_tpt != ((window->success_ratio *
2114 tbl->expected_tpt[index] + 64) / 128));
2115
2116 /* If we are searching for better modulation mode, check success. */
2117 if (lq_sta->search_better_tbl) {
2118
2119 /* If good success, continue using the "search" mode;
2120 * no need to send new link quality command, since we're
2121 * continuing to use the setup that we've been trying. */
2122 if (window->average_tpt > lq_sta->last_tpt) {
2123
2124 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2125 "suc=%d cur-tpt=%d old-tpt=%d\n",
2126 window->success_ratio,
2127 window->average_tpt,
2128 lq_sta->last_tpt);
2129
2130 if (!is_legacy(tbl->lq_type))
2131 lq_sta->enable_counter = 1;
2132
2133 /* Swap tables; "search" becomes "active" */
2134 lq_sta->active_tbl = active_tbl;
2135 current_tpt = window->average_tpt;
2136
2137 /* Else poor success; go back to mode in "active" table */
2138 } else {
2139
2140 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2141 "suc=%d cur-tpt=%d old-tpt=%d\n",
2142 window->success_ratio,
2143 window->average_tpt,
2144 lq_sta->last_tpt);
2145
2146 /* Nullify "search" table */
2147 tbl->lq_type = LQ_NONE;
2148
2149 /* Revert to "active" table */
2150 active_tbl = lq_sta->active_tbl;
2151 tbl = &(lq_sta->lq_info[active_tbl]);
2152
2153 /* Revert to "active" rate and throughput info */
2154 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2155 current_tpt = lq_sta->last_tpt;
2156
2157 /* Need to set up a new rate table in uCode */
2158 update_lq = 1;
2159 }
2160
2161 /* Either way, we've made a decision; modulation mode
2162 * search is done, allow rate adjustment next time. */
2163 lq_sta->search_better_tbl = 0;
2164 done_search = 1; /* Don't switch modes below! */
2165 goto lq_update;
2166 }
2167
2168 /* (Else) not in search of better modulation mode, try for better
2169 * starting rate, while staying in this mode. */
2170 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2171 tbl->lq_type);
2172 low = high_low & 0xff;
2173 high = (high_low >> 8) & 0xff;
2174
2175 /* If user set max rate, dont allow higher than user constrain */
2176 if ((lq_sta->max_rate_idx != -1) &&
2177 (lq_sta->max_rate_idx < high))
2178 high = IWL_RATE_INVALID;
2179
2180 sr = window->success_ratio;
2181
2182 /* Collect measured throughputs for current and adjacent rates */
2183 current_tpt = window->average_tpt;
2184 if (low != IWL_RATE_INVALID)
2185 low_tpt = tbl->win[low].average_tpt;
2186 if (high != IWL_RATE_INVALID)
2187 high_tpt = tbl->win[high].average_tpt;
2188
2189 scale_action = 0;
2190
2191 /* Too many failures, decrease rate */
2192 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2193 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2194 scale_action = -1;
2195
2196 /* No throughput measured yet for adjacent rates; try increase. */
2197 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2198 (high_tpt == IWL_INVALID_VALUE)) {
2199
2200 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2201 scale_action = 1;
2202 else if (low != IWL_RATE_INVALID)
2203 scale_action = 0;
2204 }
2205
2206 /* Both adjacent throughputs are measured, but neither one has better
2207 * throughput; we're using the best rate, don't change it! */
2208 else if ((low_tpt != IWL_INVALID_VALUE) &&
2209 (high_tpt != IWL_INVALID_VALUE) &&
2210 (low_tpt < current_tpt) &&
2211 (high_tpt < current_tpt))
2212 scale_action = 0;
2213
2214 /* At least one adjacent rate's throughput is measured,
2215 * and may have better performance. */
2216 else {
2217 /* Higher adjacent rate's throughput is measured */
2218 if (high_tpt != IWL_INVALID_VALUE) {
2219 /* Higher rate has better throughput */
2220 if (high_tpt > current_tpt &&
2221 sr >= IWL_RATE_INCREASE_TH) {
2222 scale_action = 1;
2223 } else {
2224 scale_action = 0;
2225 }
2226
2227 /* Lower adjacent rate's throughput is measured */
2228 } else if (low_tpt != IWL_INVALID_VALUE) {
2229 /* Lower rate has better throughput */
2230 if (low_tpt > current_tpt) {
2231 IWL_DEBUG_RATE(priv,
2232 "decrease rate because of low tpt\n");
2233 scale_action = -1;
2234 } else if (sr >= IWL_RATE_INCREASE_TH) {
2235 scale_action = 1;
2236 }
2237 }
2238 }
2239
2240 /* Sanity check; asked for decrease, but success rate or throughput
2241 * has been good at old rate. Don't change it. */
2242 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2243 ((sr > IWL_RATE_HIGH_TH) ||
2244 (current_tpt > (100 * tbl->expected_tpt[low]))))
2245 scale_action = 0;
2246
2247 switch (scale_action) {
2248 case -1:
2249 /* Decrease starting rate, update uCode's rate table */
2250 if (low != IWL_RATE_INVALID) {
2251 update_lq = 1;
2252 index = low;
2253 }
2254
2255 break;
2256 case 1:
2257 /* Increase starting rate, update uCode's rate table */
2258 if (high != IWL_RATE_INVALID) {
2259 update_lq = 1;
2260 index = high;
2261 }
2262
2263 break;
2264 case 0:
2265 /* No change */
2266 default:
2267 break;
2268 }
2269
2270 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2271 "high %d type %d\n",
2272 index, scale_action, low, high, tbl->lq_type);
2273
2274 lq_update:
2275 /* Replace uCode's rate table for the destination station. */
2276 if (update_lq) {
2277 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2278 rs_fill_link_cmd(priv, lq_sta, rate);
2279 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2280 }
2281
2282 /* Should we stay with this modulation mode, or search for a new one? */
2283 rs_stay_in_table(lq_sta);
2284
2285 /*
2286 * Search for new modulation mode if we're:
2287 * 1) Not changing rates right now
2288 * 2) Not just finishing up a search
2289 * 3) Allowing a new search
2290 */
2291 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2292 /* Save current throughput to compare with "search" throughput*/
2293 lq_sta->last_tpt = current_tpt;
2294
2295 /* Select a new "search" modulation mode to try.
2296 * If one is found, set up the new "search" table. */
2297 if (is_legacy(tbl->lq_type))
2298 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2299 else if (is_siso(tbl->lq_type))
2300 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2301 else if (is_mimo2(tbl->lq_type))
2302 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2303 else
2304 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2305
2306 /* If new "search" mode was selected, set up in uCode table */
2307 if (lq_sta->search_better_tbl) {
2308 /* Access the "search" table, clear its history. */
2309 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2310 for (i = 0; i < IWL_RATE_COUNT; i++)
2311 rs_rate_scale_clear_window(&(tbl->win[i]));
2312
2313 /* Use new "search" start rate */
2314 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2315
2316 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2317 tbl->current_rate, index);
2318 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2319 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2320 } else
2321 done_search = 1;
2322 }
2323
2324 if (done_search && !lq_sta->stay_in_tbl) {
2325 /* If the "active" (non-search) mode was legacy,
2326 * and we've tried switching antennas,
2327 * but we haven't been able to try HT modes (not available),
2328 * stay with best antenna legacy modulation for a while
2329 * before next round of mode comparisons. */
2330 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2331 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2332 lq_sta->action_counter >= 1) {
2333 lq_sta->action_counter = 0;
2334 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2335 rs_set_stay_in_table(priv, 1, lq_sta);
2336 }
2337
2338 /* If we're in an HT mode, and all 3 mode switch actions
2339 * have been tried and compared, stay in this best modulation
2340 * mode for a while before next round of mode comparisons. */
2341 if (lq_sta->enable_counter &&
2342 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2343 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2344 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2345 (tid != MAX_TID_COUNT)) {
2346 tid_data =
2347 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2348 if (tid_data->agg.state == IWL_AGG_OFF) {
2349 IWL_DEBUG_RATE(priv,
2350 "try to aggregate tid %d\n",
2351 tid);
2352 rs_tl_turn_on_agg(priv, tid,
2353 lq_sta, sta);
2354 }
2355 }
2356 lq_sta->action_counter = 0;
2357 rs_set_stay_in_table(priv, 0, lq_sta);
2358 }
2359 }
2360
2361 out:
2362 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2363 i = index;
2364 lq_sta->last_txrate_idx = i;
2365
2366 return;
2367 }
2368
2369
2370 static void rs_initialize_lq(struct iwl_priv *priv,
2371 struct ieee80211_conf *conf,
2372 struct ieee80211_sta *sta,
2373 struct iwl_lq_sta *lq_sta)
2374 {
2375 struct iwl_scale_tbl_info *tbl;
2376 int rate_idx;
2377 int i;
2378 u32 rate;
2379 u8 use_green = rs_use_green(priv, conf);
2380 u8 active_tbl = 0;
2381 u8 valid_tx_ant;
2382
2383 if (!sta || !lq_sta)
2384 goto out;
2385
2386 i = lq_sta->last_txrate_idx;
2387
2388 if ((lq_sta->lq.sta_id == 0xff) &&
2389 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2390 goto out;
2391
2392 valid_tx_ant = priv->hw_params.valid_tx_ant;
2393
2394 if (!lq_sta->search_better_tbl)
2395 active_tbl = lq_sta->active_tbl;
2396 else
2397 active_tbl = 1 - lq_sta->active_tbl;
2398
2399 tbl = &(lq_sta->lq_info[active_tbl]);
2400
2401 if ((i < 0) || (i >= IWL_RATE_COUNT))
2402 i = 0;
2403
2404 rate = iwl_rates[i].plcp;
2405 tbl->ant_type = first_antenna(valid_tx_ant);
2406 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2407
2408 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2409 rate |= RATE_MCS_CCK_MSK;
2410
2411 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2412 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2413 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2414
2415 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2416 tbl->current_rate = rate;
2417 rs_set_expected_tpt_table(lq_sta, tbl);
2418 rs_fill_link_cmd(NULL, lq_sta, rate);
2419 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2420 out:
2421 return;
2422 }
2423
2424 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2425 struct ieee80211_tx_rate_control *txrc)
2426 {
2427
2428 struct sk_buff *skb = txrc->skb;
2429 struct ieee80211_supported_band *sband = txrc->sband;
2430 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2431 struct ieee80211_conf *conf = &priv->hw->conf;
2432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2433 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2434 struct iwl_lq_sta *lq_sta = priv_sta;
2435 int rate_idx;
2436 u64 mask_bit = 0;
2437
2438 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2439
2440 /* Get max rate if user set max rate */
2441 if (lq_sta) {
2442 lq_sta->max_rate_idx = txrc->max_rate_idx;
2443 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2444 (lq_sta->max_rate_idx != -1))
2445 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2446 if ((lq_sta->max_rate_idx < 0) ||
2447 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2448 lq_sta->max_rate_idx = -1;
2449 }
2450
2451 if (sta)
2452 mask_bit = sta->supp_rates[sband->band];
2453
2454 /* Send management frames and NO_ACK data using lowest rate. */
2455 if (!ieee80211_is_data(hdr->frame_control) ||
2456 info->flags & IEEE80211_TX_CTL_NO_ACK || !sta || !lq_sta) {
2457 if (!mask_bit)
2458 info->control.rates[0].idx =
2459 rate_lowest_index(sband, NULL);
2460 else
2461 info->control.rates[0].idx =
2462 rate_lowest_index(sband, sta);
2463 if (info->flags & IEEE80211_TX_CTL_NO_ACK)
2464 info->control.rates[0].count = 1;
2465 return;
2466 }
2467
2468 rate_idx = lq_sta->last_txrate_idx;
2469
2470 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2471 !lq_sta->ibss_sta_added) {
2472 u8 sta_id = priv->cfg->ops->smgmt->find_station(priv,
2473 hdr->addr1);
2474
2475 if (sta_id == IWL_INVALID_STATION) {
2476 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
2477 hdr->addr1);
2478 sta_id = priv->cfg->ops->smgmt->add_station(priv,
2479 hdr->addr1, 0,
2480 CMD_ASYNC, NULL);
2481 }
2482 if ((sta_id != IWL_INVALID_STATION)) {
2483 lq_sta->lq.sta_id = sta_id;
2484 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2485 lq_sta->ibss_sta_added = 1;
2486 rs_initialize_lq(priv, conf, sta, lq_sta);
2487 }
2488 }
2489
2490 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2491 rate_idx = rate_lowest_index(sband, sta);
2492 else if (sband->band == IEEE80211_BAND_5GHZ)
2493 rate_idx -= IWL_FIRST_OFDM_RATE;
2494
2495 info->control.rates[0].idx = rate_idx;
2496 }
2497
2498 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2499 gfp_t gfp)
2500 {
2501 struct iwl_lq_sta *lq_sta;
2502 struct iwl_priv *priv;
2503 int i, j;
2504
2505 priv = (struct iwl_priv *)priv_rate;
2506 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2507
2508 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2509
2510 if (lq_sta == NULL)
2511 return NULL;
2512 lq_sta->lq.sta_id = 0xff;
2513
2514
2515 for (j = 0; j < LQ_SIZE; j++)
2516 for (i = 0; i < IWL_RATE_COUNT; i++)
2517 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2518
2519 return lq_sta;
2520 }
2521
2522 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2523 struct ieee80211_sta *sta, void *priv_sta)
2524 {
2525 int i, j;
2526 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2527 struct ieee80211_conf *conf = &priv->hw->conf;
2528 struct iwl_lq_sta *lq_sta = priv_sta;
2529 u16 mask_bit = 0;
2530 int count;
2531 int start_rate = 0;
2532
2533 lq_sta->flush_timer = 0;
2534 lq_sta->supp_rates = sta->supp_rates[sband->band];
2535 for (j = 0; j < LQ_SIZE; j++)
2536 for (i = 0; i < IWL_RATE_COUNT; i++)
2537 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2538
2539 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
2540 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2541 * the lowest or the highest rate.. Could consider using RSSI from
2542 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2543 * after assoc.. */
2544
2545 lq_sta->ibss_sta_added = 0;
2546 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2547 u8 sta_id = priv->cfg->ops->smgmt->find_station(priv,
2548 sta->addr);
2549
2550 /* for IBSS the call are from tasklet */
2551 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2552
2553 if (sta_id == IWL_INVALID_STATION) {
2554 IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
2555 sta_id = priv->cfg->ops->smgmt->add_station(priv,
2556 sta->addr, 0,
2557 CMD_ASYNC, NULL);
2558 }
2559 if ((sta_id != IWL_INVALID_STATION)) {
2560 lq_sta->lq.sta_id = sta_id;
2561 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2562 }
2563 /* FIXME: this is w/a remove it later */
2564 priv->assoc_station_added = 1;
2565 }
2566
2567 lq_sta->is_dup = 0;
2568 lq_sta->max_rate_idx = -1;
2569 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2570 lq_sta->is_green = rs_use_green(priv, conf);
2571 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2572 lq_sta->active_rate_basic = priv->active_rate_basic;
2573 lq_sta->band = priv->band;
2574 /*
2575 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2576 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2577 */
2578 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2579 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2580 lq_sta->active_siso_rate &= ~((u16)0x2);
2581 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2582
2583 /* Same here */
2584 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2585 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2586 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2587 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2588
2589 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2590 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2591 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2592 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2593
2594 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2595 lq_sta->active_siso_rate,
2596 lq_sta->active_mimo2_rate,
2597 lq_sta->active_mimo3_rate);
2598
2599 /* These values will be overridden later */
2600 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2601 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2602
2603 /* as default allow aggregation for all tids */
2604 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2605 lq_sta->drv = priv;
2606
2607 /* Find highest tx rate supported by hardware and destination station */
2608 mask_bit = sta->supp_rates[sband->band];
2609 count = sband->n_bitrates;
2610 if (sband->band == IEEE80211_BAND_5GHZ) {
2611 count += IWL_FIRST_OFDM_RATE;
2612 start_rate = IWL_FIRST_OFDM_RATE;
2613 mask_bit <<= IWL_FIRST_OFDM_RATE;
2614 }
2615
2616 mask_bit = mask_bit & lq_sta->active_legacy_rate;
2617 lq_sta->last_txrate_idx = 4;
2618 for (i = start_rate; i < count; i++)
2619 if (mask_bit & BIT(i))
2620 lq_sta->last_txrate_idx = i;
2621
2622 rs_initialize_lq(priv, conf, sta, lq_sta);
2623 }
2624
2625 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2626 struct iwl_lq_sta *lq_sta, u32 new_rate)
2627 {
2628 struct iwl_scale_tbl_info tbl_type;
2629 int index = 0;
2630 int rate_idx;
2631 int repeat_rate = 0;
2632 u8 ant_toggle_cnt = 0;
2633 u8 use_ht_possible = 1;
2634 u8 valid_tx_ant = 0;
2635 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2636
2637 /* Override starting rate (index 0) if needed for debug purposes */
2638 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2639
2640 /* Interpret new_rate (rate_n_flags) */
2641 memset(&tbl_type, 0, sizeof(tbl_type));
2642 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2643 &tbl_type, &rate_idx);
2644
2645 /* How many times should we repeat the initial rate? */
2646 if (is_legacy(tbl_type.lq_type)) {
2647 ant_toggle_cnt = 1;
2648 repeat_rate = IWL_NUMBER_TRY;
2649 } else {
2650 repeat_rate = IWL_HT_NUMBER_TRY;
2651 }
2652
2653 lq_cmd->general_params.mimo_delimiter =
2654 is_mimo(tbl_type.lq_type) ? 1 : 0;
2655
2656 /* Fill 1st table entry (index 0) */
2657 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2658
2659 if (num_of_ant(tbl_type.ant_type) == 1) {
2660 lq_cmd->general_params.single_stream_ant_msk =
2661 tbl_type.ant_type;
2662 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2663 lq_cmd->general_params.dual_stream_ant_msk =
2664 tbl_type.ant_type;
2665 } /* otherwise we don't modify the existing value */
2666
2667 index++;
2668 repeat_rate--;
2669
2670 if (priv)
2671 valid_tx_ant = priv->hw_params.valid_tx_ant;
2672
2673 /* Fill rest of rate table */
2674 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2675 /* Repeat initial/next rate.
2676 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2677 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2678 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2679 if (is_legacy(tbl_type.lq_type)) {
2680 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2681 ant_toggle_cnt++;
2682 else if (priv &&
2683 rs_toggle_antenna(valid_tx_ant,
2684 &new_rate, &tbl_type))
2685 ant_toggle_cnt = 1;
2686 }
2687
2688 /* Override next rate if needed for debug purposes */
2689 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2690
2691 /* Fill next table entry */
2692 lq_cmd->rs_table[index].rate_n_flags =
2693 cpu_to_le32(new_rate);
2694 repeat_rate--;
2695 index++;
2696 }
2697
2698 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2699 &rate_idx);
2700
2701 /* Indicate to uCode which entries might be MIMO.
2702 * If initial rate was MIMO, this will finally end up
2703 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2704 if (is_mimo(tbl_type.lq_type))
2705 lq_cmd->general_params.mimo_delimiter = index;
2706
2707 /* Get next rate */
2708 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2709 use_ht_possible);
2710
2711 /* How many times should we repeat the next rate? */
2712 if (is_legacy(tbl_type.lq_type)) {
2713 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2714 ant_toggle_cnt++;
2715 else if (priv &&
2716 rs_toggle_antenna(valid_tx_ant,
2717 &new_rate, &tbl_type))
2718 ant_toggle_cnt = 1;
2719
2720 repeat_rate = IWL_NUMBER_TRY;
2721 } else {
2722 repeat_rate = IWL_HT_NUMBER_TRY;
2723 }
2724
2725 /* Don't allow HT rates after next pass.
2726 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2727 use_ht_possible = 0;
2728
2729 /* Override next rate if needed for debug purposes */
2730 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2731
2732 /* Fill next table entry */
2733 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2734
2735 index++;
2736 repeat_rate--;
2737 }
2738
2739 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2740 lq_cmd->agg_params.agg_dis_start_th = 3;
2741 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2742 }
2743
2744 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2745 {
2746 return hw->priv;
2747 }
2748 /* rate scale requires free function to be implemented */
2749 static void rs_free(void *priv_rate)
2750 {
2751 return;
2752 }
2753
2754 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2755 void *priv_sta)
2756 {
2757 struct iwl_lq_sta *lq_sta = priv_sta;
2758 struct iwl_priv *priv __maybe_unused = priv_r;
2759
2760 IWL_DEBUG_RATE(priv, "enter\n");
2761 kfree(lq_sta);
2762 IWL_DEBUG_RATE(priv, "leave\n");
2763 }
2764
2765
2766 #ifdef CONFIG_MAC80211_DEBUGFS
2767 static int open_file_generic(struct inode *inode, struct file *file)
2768 {
2769 file->private_data = inode->i_private;
2770 return 0;
2771 }
2772 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2773 u32 *rate_n_flags, int index)
2774 {
2775 struct iwl_priv *priv;
2776 u8 valid_tx_ant;
2777 u8 ant_sel_tx;
2778
2779 priv = lq_sta->drv;
2780 valid_tx_ant = priv->hw_params.valid_tx_ant;
2781 if (lq_sta->dbg_fixed_rate) {
2782 ant_sel_tx =
2783 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2784 >> RATE_MCS_ANT_POS);
2785 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2786 *rate_n_flags = lq_sta->dbg_fixed_rate;
2787 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2788 } else {
2789 lq_sta->dbg_fixed_rate = 0;
2790 IWL_ERR(priv,
2791 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2792 ant_sel_tx, valid_tx_ant);
2793 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2794 }
2795 } else {
2796 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2797 }
2798 }
2799
2800 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2801 const char __user *user_buf, size_t count, loff_t *ppos)
2802 {
2803 struct iwl_lq_sta *lq_sta = file->private_data;
2804 struct iwl_priv *priv;
2805 char buf[64];
2806 int buf_size;
2807 u32 parsed_rate;
2808
2809 priv = lq_sta->drv;
2810 memset(buf, 0, sizeof(buf));
2811 buf_size = min(count, sizeof(buf) - 1);
2812 if (copy_from_user(buf, user_buf, buf_size))
2813 return -EFAULT;
2814
2815 if (sscanf(buf, "%x", &parsed_rate) == 1)
2816 lq_sta->dbg_fixed_rate = parsed_rate;
2817 else
2818 lq_sta->dbg_fixed_rate = 0;
2819
2820 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2821 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2822 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2823 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2824
2825 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2826 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2827
2828 if (lq_sta->dbg_fixed_rate) {
2829 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2830 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2831 }
2832
2833 return count;
2834 }
2835
2836 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2837 char __user *user_buf, size_t count, loff_t *ppos)
2838 {
2839 char *buff;
2840 int desc = 0;
2841 int i = 0;
2842 int index = 0;
2843 ssize_t ret;
2844
2845 struct iwl_lq_sta *lq_sta = file->private_data;
2846 struct iwl_priv *priv;
2847 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2848
2849 priv = lq_sta->drv;
2850 buff = kmalloc(1024, GFP_KERNEL);
2851 if (!buff)
2852 return -ENOMEM;
2853
2854 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2855 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2856 lq_sta->total_failed, lq_sta->total_success,
2857 lq_sta->active_legacy_rate);
2858 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2859 lq_sta->dbg_fixed_rate);
2860 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2861 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2862 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2863 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2864 desc += sprintf(buff+desc, "lq type %s\n",
2865 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2866 if (is_Ht(tbl->lq_type)) {
2867 desc += sprintf(buff+desc, " %s",
2868 (is_siso(tbl->lq_type)) ? "SISO" :
2869 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2870 desc += sprintf(buff+desc, " %s",
2871 (tbl->is_fat) ? "40MHz" : "20MHz");
2872 desc += sprintf(buff+desc, " %s\n", (tbl->is_SGI) ? "SGI" : "");
2873 }
2874 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2875 lq_sta->last_rate_n_flags);
2876 desc += sprintf(buff+desc, "general:"
2877 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2878 lq_sta->lq.general_params.flags,
2879 lq_sta->lq.general_params.mimo_delimiter,
2880 lq_sta->lq.general_params.single_stream_ant_msk,
2881 lq_sta->lq.general_params.dual_stream_ant_msk);
2882
2883 desc += sprintf(buff+desc, "agg:"
2884 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2885 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2886 lq_sta->lq.agg_params.agg_dis_start_th,
2887 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2888
2889 desc += sprintf(buff+desc,
2890 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2891 lq_sta->lq.general_params.start_rate_index[0],
2892 lq_sta->lq.general_params.start_rate_index[1],
2893 lq_sta->lq.general_params.start_rate_index[2],
2894 lq_sta->lq.general_params.start_rate_index[3]);
2895
2896 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2897 index = iwl_hwrate_to_plcp_idx(
2898 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2899 if (is_legacy(tbl->lq_type)) {
2900 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2901 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2902 iwl_rate_mcs[index].mbps);
2903 } else {
2904 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2905 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2906 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2907 }
2908 }
2909
2910 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2911 kfree(buff);
2912 return ret;
2913 }
2914
2915 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2916 .write = rs_sta_dbgfs_scale_table_write,
2917 .read = rs_sta_dbgfs_scale_table_read,
2918 .open = open_file_generic,
2919 };
2920 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2921 char __user *user_buf, size_t count, loff_t *ppos)
2922 {
2923 char *buff;
2924 int desc = 0;
2925 int i, j;
2926 ssize_t ret;
2927
2928 struct iwl_lq_sta *lq_sta = file->private_data;
2929
2930 buff = kmalloc(1024, GFP_KERNEL);
2931 if (!buff)
2932 return -ENOMEM;
2933
2934 for (i = 0; i < LQ_SIZE; i++) {
2935 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2936 "rate=0x%X\n",
2937 lq_sta->active_tbl == i ? "*" : "x",
2938 lq_sta->lq_info[i].lq_type,
2939 lq_sta->lq_info[i].is_SGI,
2940 lq_sta->lq_info[i].is_fat,
2941 lq_sta->lq_info[i].is_dup,
2942 lq_sta->lq_info[i].current_rate);
2943 for (j = 0; j < IWL_RATE_COUNT; j++) {
2944 desc += sprintf(buff+desc,
2945 "counter=%d success=%d %%=%d\n",
2946 lq_sta->lq_info[i].win[j].counter,
2947 lq_sta->lq_info[i].win[j].success_counter,
2948 lq_sta->lq_info[i].win[j].success_ratio);
2949 }
2950 }
2951 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2952 kfree(buff);
2953 return ret;
2954 }
2955
2956 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2957 .read = rs_sta_dbgfs_stats_table_read,
2958 .open = open_file_generic,
2959 };
2960
2961 static void rs_add_debugfs(void *priv, void *priv_sta,
2962 struct dentry *dir)
2963 {
2964 struct iwl_lq_sta *lq_sta = priv_sta;
2965 lq_sta->rs_sta_dbgfs_scale_table_file =
2966 debugfs_create_file("rate_scale_table", 0600, dir,
2967 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2968 lq_sta->rs_sta_dbgfs_stats_table_file =
2969 debugfs_create_file("rate_stats_table", 0600, dir,
2970 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2971 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2972 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2973 &lq_sta->tx_agg_tid_en);
2974
2975 }
2976
2977 static void rs_remove_debugfs(void *priv, void *priv_sta)
2978 {
2979 struct iwl_lq_sta *lq_sta = priv_sta;
2980 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2981 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2982 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2983 }
2984 #endif
2985
2986 static struct rate_control_ops rs_ops = {
2987 .module = NULL,
2988 .name = RS_NAME,
2989 .tx_status = rs_tx_status,
2990 .get_rate = rs_get_rate,
2991 .rate_init = rs_rate_init,
2992 .alloc = rs_alloc,
2993 .free = rs_free,
2994 .alloc_sta = rs_alloc_sta,
2995 .free_sta = rs_free_sta,
2996 #ifdef CONFIG_MAC80211_DEBUGFS
2997 .add_sta_debugfs = rs_add_debugfs,
2998 .remove_sta_debugfs = rs_remove_debugfs,
2999 #endif
3000 };
3001
3002 int iwlagn_rate_control_register(void)
3003 {
3004 return ieee80211_rate_control_register(&rs_ops);
3005 }
3006
3007 void iwlagn_rate_control_unregister(void)
3008 {
3009 ieee80211_rate_control_unregister(&rs_ops);
3010 }
3011
Linux kernel - Deliverables
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