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iwlwifi: allow user to set max rate
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / iwlwifi / iwl-agn-rs.c
blob12c5e5d6e910dbf48efc278604fde0982fcee6d3
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 time to accum history 2 seconds */
53 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
54
55 static u8 rs_ht_to_legacy[] = {
56 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
60 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
61 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
62 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
63 };
64
65 static const u8 ant_toggle_lookup[] = {
66 /*ANT_NONE -> */ ANT_NONE,
67 /*ANT_A -> */ ANT_B,
68 /*ANT_B -> */ ANT_C,
69 /*ANT_AB -> */ ANT_BC,
70 /*ANT_C -> */ ANT_A,
71 /*ANT_AC -> */ ANT_AB,
72 /*ANT_BC -> */ ANT_AC,
73 /*ANT_ABC -> */ ANT_ABC,
74 };
75
76 /**
77 * struct iwl_rate_scale_data -- tx success history for one rate
78 */
79 struct iwl_rate_scale_data {
80 u64 data; /* bitmap of successful frames */
81 s32 success_counter; /* number of frames successful */
82 s32 success_ratio; /* per-cent * 128 */
83 s32 counter; /* number of frames attempted */
84 s32 average_tpt; /* success ratio * expected throughput */
85 unsigned long stamp;
86 };
87
88 /**
89 * struct iwl_scale_tbl_info -- tx params and success history for all rates
90 *
91 * There are two of these in struct iwl_lq_sta,
92 * one for "active", and one for "search".
93 */
94 struct iwl_scale_tbl_info {
95 enum iwl_table_type lq_type;
96 u8 ant_type;
97 u8 is_SGI; /* 1 = short guard interval */
98 u8 is_fat; /* 1 = 40 MHz channel width */
99 u8 is_dup; /* 1 = duplicated data streams */
100 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
101 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
102 u32 current_rate; /* rate_n_flags, uCode API format */
103 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
104 };
105
106 struct iwl_traffic_load {
107 unsigned long time_stamp; /* age of the oldest statistics */
108 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
109 * slice */
110 u32 total; /* total num of packets during the
111 * last TID_MAX_TIME_DIFF */
112 u8 queue_count; /* number of queues that has
113 * been used since the last cleanup */
114 u8 head; /* start of the circular buffer */
115 };
116
117 /**
118 * struct iwl_lq_sta -- driver's rate scaling private structure
119 *
120 * Pointer to this gets passed back and forth between driver and mac80211.
121 */
122 struct iwl_lq_sta {
123 u8 active_tbl; /* index of active table, range 0-1 */
124 u8 enable_counter; /* indicates HT mode */
125 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
126 u8 search_better_tbl; /* 1: currently trying alternate mode */
127 s32 last_tpt;
128
129 /* The following determine when to search for a new mode */
130 u32 table_count_limit;
131 u32 max_failure_limit; /* # failed frames before new search */
132 u32 max_success_limit; /* # successful frames before new search */
133 u32 table_count;
134 u32 total_failed; /* total failed frames, any/all rates */
135 u32 total_success; /* total successful frames, any/all rates */
136 u32 flush_timer; /* time staying in mode before new search */
137
138 u8 action_counter; /* # mode-switch actions tried */
139 u8 is_green;
140 u8 is_dup;
141 enum ieee80211_band band;
142 u8 ibss_sta_added;
143
144 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
145 u32 supp_rates;
146 u16 active_legacy_rate;
147 u16 active_siso_rate;
148 u16 active_mimo2_rate;
149 u16 active_mimo3_rate;
150 u16 active_rate_basic;
151 s8 max_rate_idx; /* Max rate set by user */
152
153 struct iwl_link_quality_cmd lq;
154 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
155 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
156 u8 tx_agg_tid_en;
157 #ifdef CONFIG_MAC80211_DEBUGFS
158 struct dentry *rs_sta_dbgfs_scale_table_file;
159 struct dentry *rs_sta_dbgfs_stats_table_file;
160 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
161 u32 dbg_fixed_rate;
162 #endif
163 struct iwl_priv *drv;
164
165 /* used to be in sta_info */
166 int last_txrate_idx;
167 };
168
169 static void rs_rate_scale_perform(struct iwl_priv *priv,
170 struct ieee80211_hdr *hdr,
171 struct ieee80211_sta *sta,
172 struct iwl_lq_sta *lq_sta);
173 static void rs_fill_link_cmd(const struct iwl_priv *priv,
174 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
175
176
177 #ifdef CONFIG_MAC80211_DEBUGFS
178 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
179 u32 *rate_n_flags, int index);
180 #else
181 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
182 u32 *rate_n_flags, int index)
183 {}
184 #endif
185
186 /*
187 * Expected throughput metrics for following rates:
188 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
189 * "G" is the only table that supports CCK (the first 4 rates).
190 */
191 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
192 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
193 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
194 };
195
196 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
197 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
198 };
199
200 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
201 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
202 };
203
204 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
205 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
206 };
207
208 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
209 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
210 };
211
212 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
213 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
214 };
215
216 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
217 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
218 };
219
220 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
221 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
222 };
223
224 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
225 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
226 };
227
228 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
229 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
230 };
231
232 static inline u8 rs_extract_rate(u32 rate_n_flags)
233 {
234 return (u8)(rate_n_flags & 0xFF);
235 }
236
237 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
238 {
239 window->data = 0;
240 window->success_counter = 0;
241 window->success_ratio = IWL_INVALID_VALUE;
242 window->counter = 0;
243 window->average_tpt = IWL_INVALID_VALUE;
244 window->stamp = 0;
245 }
246
247 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
248 {
249 return (ant_type & valid_antenna) == ant_type;
250 }
251
252 /*
253 * removes the old data from the statistics. All data that is older than
254 * TID_MAX_TIME_DIFF, will be deleted.
255 */
256 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
257 {
258 /* The oldest age we want to keep */
259 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
260
261 while (tl->queue_count &&
262 (tl->time_stamp < oldest_time)) {
263 tl->total -= tl->packet_count[tl->head];
264 tl->packet_count[tl->head] = 0;
265 tl->time_stamp += TID_QUEUE_CELL_SPACING;
266 tl->queue_count--;
267 tl->head++;
268 if (tl->head >= TID_QUEUE_MAX_SIZE)
269 tl->head = 0;
270 }
271 }
272
273 /*
274 * increment traffic load value for tid and also remove
275 * any old values if passed the certain time period
276 */
277 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
278 struct ieee80211_hdr *hdr)
279 {
280 u32 curr_time = jiffies_to_msecs(jiffies);
281 u32 time_diff;
282 s32 index;
283 struct iwl_traffic_load *tl = NULL;
284 u8 tid;
285
286 if (ieee80211_is_data_qos(hdr->frame_control)) {
287 u8 *qc = ieee80211_get_qos_ctl(hdr);
288 tid = qc[0] & 0xf;
289 } else
290 return MAX_TID_COUNT;
291
292 tl = &lq_data->load[tid];
293
294 curr_time -= curr_time % TID_ROUND_VALUE;
295
296 /* Happens only for the first packet. Initialize the data */
297 if (!(tl->queue_count)) {
298 tl->total = 1;
299 tl->time_stamp = curr_time;
300 tl->queue_count = 1;
301 tl->head = 0;
302 tl->packet_count[0] = 1;
303 return MAX_TID_COUNT;
304 }
305
306 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
307 index = time_diff / TID_QUEUE_CELL_SPACING;
308
309 /* The history is too long: remove data that is older than */
310 /* TID_MAX_TIME_DIFF */
311 if (index >= TID_QUEUE_MAX_SIZE)
312 rs_tl_rm_old_stats(tl, curr_time);
313
314 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
315 tl->packet_count[index] = tl->packet_count[index] + 1;
316 tl->total = tl->total + 1;
317
318 if ((index + 1) > tl->queue_count)
319 tl->queue_count = index + 1;
320
321 return tid;
322 }
323
324 /*
325 get the traffic load value for tid
326 */
327 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
328 {
329 u32 curr_time = jiffies_to_msecs(jiffies);
330 u32 time_diff;
331 s32 index;
332 struct iwl_traffic_load *tl = NULL;
333
334 if (tid >= TID_MAX_LOAD_COUNT)
335 return 0;
336
337 tl = &(lq_data->load[tid]);
338
339 curr_time -= curr_time % TID_ROUND_VALUE;
340
341 if (!(tl->queue_count))
342 return 0;
343
344 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
345 index = time_diff / TID_QUEUE_CELL_SPACING;
346
347 /* The history is too long: remove data that is older than */
348 /* TID_MAX_TIME_DIFF */
349 if (index >= TID_QUEUE_MAX_SIZE)
350 rs_tl_rm_old_stats(tl, curr_time);
351
352 return tl->total;
353 }
354
355 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
356 struct iwl_lq_sta *lq_data, u8 tid,
357 struct ieee80211_sta *sta)
358 {
359 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
360 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
361 sta->addr, tid);
362 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
363 }
364 }
365
366 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
367 struct iwl_lq_sta *lq_data,
368 struct ieee80211_sta *sta)
369 {
370 if ((tid < TID_MAX_LOAD_COUNT))
371 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
372 else if (tid == IWL_AGG_ALL_TID)
373 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
374 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
375 }
376
377 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
378 {
379 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
380 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
381 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
382 }
383
384 /**
385 * rs_collect_tx_data - Update the success/failure sliding window
386 *
387 * We keep a sliding window of the last 62 packets transmitted
388 * at this rate. window->data contains the bitmask of successful
389 * packets.
390 */
391 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
392 int scale_index, s32 tpt, int retries,
393 int successes)
394 {
395 struct iwl_rate_scale_data *window = NULL;
396 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
397 s32 fail_count;
398
399 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
400 return -EINVAL;
401
402 /* Select data for current tx bit rate */
403 window = &(windows[scale_index]);
404
405 /*
406 * Keep track of only the latest 62 tx frame attempts in this rate's
407 * history window; anything older isn't really relevant any more.
408 * If we have filled up the sliding window, drop the oldest attempt;
409 * if the oldest attempt (highest bit in bitmap) shows "success",
410 * subtract "1" from the success counter (this is the main reason
411 * we keep these bitmaps!).
412 */
413 while (retries > 0) {
414 if (window->counter >= IWL_RATE_MAX_WINDOW) {
415
416 /* remove earliest */
417 window->counter = IWL_RATE_MAX_WINDOW - 1;
418
419 if (window->data & mask) {
420 window->data &= ~mask;
421 window->success_counter--;
422 }
423 }
424
425 /* Increment frames-attempted counter */
426 window->counter++;
427
428 /* Shift bitmap by one frame (throw away oldest history),
429 * OR in "1", and increment "success" if this
430 * frame was successful. */
431 window->data <<= 1;
432 if (successes > 0) {
433 window->success_counter++;
434 window->data |= 0x1;
435 successes--;
436 }
437
438 retries--;
439 }
440
441 /* Calculate current success ratio, avoid divide-by-0! */
442 if (window->counter > 0)
443 window->success_ratio = 128 * (100 * window->success_counter)
444 / window->counter;
445 else
446 window->success_ratio = IWL_INVALID_VALUE;
447
448 fail_count = window->counter - window->success_counter;
449
450 /* Calculate average throughput, if we have enough history. */
451 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
452 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
453 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
454 else
455 window->average_tpt = IWL_INVALID_VALUE;
456
457 /* Tag this window as having been updated */
458 window->stamp = jiffies;
459
460 return 0;
461 }
462
463 /*
464 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
465 */
466 /* FIXME:RS:remove this function and put the flags statically in the table */
467 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
468 struct iwl_scale_tbl_info *tbl,
469 int index, u8 use_green)
470 {
471 u32 rate_n_flags = 0;
472
473 if (is_legacy(tbl->lq_type)) {
474 rate_n_flags = iwl_rates[index].plcp;
475 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
476 rate_n_flags |= RATE_MCS_CCK_MSK;
477
478 } else if (is_Ht(tbl->lq_type)) {
479 if (index > IWL_LAST_OFDM_RATE) {
480 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
481 index = IWL_LAST_OFDM_RATE;
482 }
483 rate_n_flags = RATE_MCS_HT_MSK;
484
485 if (is_siso(tbl->lq_type))
486 rate_n_flags |= iwl_rates[index].plcp_siso;
487 else if (is_mimo2(tbl->lq_type))
488 rate_n_flags |= iwl_rates[index].plcp_mimo2;
489 else
490 rate_n_flags |= iwl_rates[index].plcp_mimo3;
491 } else {
492 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
493 }
494
495 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
496 RATE_MCS_ANT_ABC_MSK);
497
498 if (is_Ht(tbl->lq_type)) {
499 if (tbl->is_fat) {
500 if (tbl->is_dup)
501 rate_n_flags |= RATE_MCS_DUP_MSK;
502 else
503 rate_n_flags |= RATE_MCS_FAT_MSK;
504 }
505 if (tbl->is_SGI)
506 rate_n_flags |= RATE_MCS_SGI_MSK;
507
508 if (use_green) {
509 rate_n_flags |= RATE_MCS_GF_MSK;
510 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
511 rate_n_flags &= ~RATE_MCS_SGI_MSK;
512 IWL_ERR(priv, "GF was set with SGI:SISO\n");
513 }
514 }
515 }
516 return rate_n_flags;
517 }
518
519 /*
520 * Interpret uCode API's rate_n_flags format,
521 * fill "search" or "active" tx mode table.
522 */
523 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
524 enum ieee80211_band band,
525 struct iwl_scale_tbl_info *tbl,
526 int *rate_idx)
527 {
528 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
529 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
530 u8 mcs;
531
532 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
533
534 if (*rate_idx == IWL_RATE_INVALID) {
535 *rate_idx = -1;
536 return -EINVAL;
537 }
538 tbl->is_SGI = 0; /* default legacy setup */
539 tbl->is_fat = 0;
540 tbl->is_dup = 0;
541 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
542 tbl->lq_type = LQ_NONE;
543
544 /* legacy rate format */
545 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
546 if (num_of_ant == 1) {
547 if (band == IEEE80211_BAND_5GHZ)
548 tbl->lq_type = LQ_A;
549 else
550 tbl->lq_type = LQ_G;
551 }
552 /* HT rate format */
553 } else {
554 if (rate_n_flags & RATE_MCS_SGI_MSK)
555 tbl->is_SGI = 1;
556
557 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
558 (rate_n_flags & RATE_MCS_DUP_MSK))
559 tbl->is_fat = 1;
560
561 if (rate_n_flags & RATE_MCS_DUP_MSK)
562 tbl->is_dup = 1;
563
564 mcs = rs_extract_rate(rate_n_flags);
565
566 /* SISO */
567 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
568 if (num_of_ant == 1)
569 tbl->lq_type = LQ_SISO; /*else NONE*/
570 /* MIMO2 */
571 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
572 if (num_of_ant == 2)
573 tbl->lq_type = LQ_MIMO2;
574 /* MIMO3 */
575 } else {
576 if (num_of_ant == 3)
577 tbl->lq_type = LQ_MIMO3;
578 }
579 }
580 return 0;
581 }
582
583 /* switch to another antenna/antennas and return 1 */
584 /* if no other valid antenna found, return 0 */
585 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
586 struct iwl_scale_tbl_info *tbl)
587 {
588 u8 new_ant_type;
589
590 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
591 return 0;
592
593 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
594 return 0;
595
596 new_ant_type = ant_toggle_lookup[tbl->ant_type];
597
598 while ((new_ant_type != tbl->ant_type) &&
599 !rs_is_valid_ant(valid_ant, new_ant_type))
600 new_ant_type = ant_toggle_lookup[new_ant_type];
601
602 if (new_ant_type == tbl->ant_type)
603 return 0;
604
605 tbl->ant_type = new_ant_type;
606 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
607 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
608 return 1;
609 }
610
611 /* FIXME:RS: in 4965 we don't use greenfield at all */
612 /* FIXME:RS: don't use greenfield for now in TX */
613 #if 0
614 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
615 {
616 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
617 priv->current_ht_config.is_green_field &&
618 !priv->current_ht_config.non_GF_STA_present;
619 }
620 #endif
621 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
622 {
623 return 0;
624 }
625
626 /**
627 * rs_get_supported_rates - get the available rates
628 *
629 * if management frame or broadcast frame only return
630 * basic available rates.
631 *
632 */
633 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
634 struct ieee80211_hdr *hdr,
635 enum iwl_table_type rate_type)
636 {
637 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
638 lq_sta->active_rate_basic)
639 return lq_sta->active_rate_basic;
640
641 if (is_legacy(rate_type)) {
642 return lq_sta->active_legacy_rate;
643 } else {
644 if (is_siso(rate_type))
645 return lq_sta->active_siso_rate;
646 else if (is_mimo2(rate_type))
647 return lq_sta->active_mimo2_rate;
648 else
649 return lq_sta->active_mimo3_rate;
650 }
651 }
652
653 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
654 int rate_type)
655 {
656 u8 high = IWL_RATE_INVALID;
657 u8 low = IWL_RATE_INVALID;
658
659 /* 802.11A or ht walks to the next literal adjacent rate in
660 * the rate table */
661 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
662 int i;
663 u32 mask;
664
665 /* Find the previous rate that is in the rate mask */
666 i = index - 1;
667 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
668 if (rate_mask & mask) {
669 low = i;
670 break;
671 }
672 }
673
674 /* Find the next rate that is in the rate mask */
675 i = index + 1;
676 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
677 if (rate_mask & mask) {
678 high = i;
679 break;
680 }
681 }
682
683 return (high << 8) | low;
684 }
685
686 low = index;
687 while (low != IWL_RATE_INVALID) {
688 low = iwl_rates[low].prev_rs;
689 if (low == IWL_RATE_INVALID)
690 break;
691 if (rate_mask & (1 << low))
692 break;
693 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
694 }
695
696 high = index;
697 while (high != IWL_RATE_INVALID) {
698 high = iwl_rates[high].next_rs;
699 if (high == IWL_RATE_INVALID)
700 break;
701 if (rate_mask & (1 << high))
702 break;
703 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
704 }
705
706 return (high << 8) | low;
707 }
708
709 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
710 struct iwl_scale_tbl_info *tbl,
711 u8 scale_index, u8 ht_possible)
712 {
713 s32 low;
714 u16 rate_mask;
715 u16 high_low;
716 u8 switch_to_legacy = 0;
717 u8 is_green = lq_sta->is_green;
718
719 /* check if we need to switch from HT to legacy rates.
720 * assumption is that mandatory rates (1Mbps or 6Mbps)
721 * are always supported (spec demand) */
722 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
723 switch_to_legacy = 1;
724 scale_index = rs_ht_to_legacy[scale_index];
725 if (lq_sta->band == IEEE80211_BAND_5GHZ)
726 tbl->lq_type = LQ_A;
727 else
728 tbl->lq_type = LQ_G;
729
730 if (num_of_ant(tbl->ant_type) > 1)
731 tbl->ant_type = ANT_A;/*FIXME:RS*/
732
733 tbl->is_fat = 0;
734 tbl->is_SGI = 0;
735 }
736
737 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
738
739 /* Mask with station rate restriction */
740 if (is_legacy(tbl->lq_type)) {
741 /* supp_rates has no CCK bits in A mode */
742 if (lq_sta->band == IEEE80211_BAND_5GHZ)
743 rate_mask = (u16)(rate_mask &
744 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
745 else
746 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
747 }
748
749 /* If we switched from HT to legacy, check current rate */
750 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
751 low = scale_index;
752 goto out;
753 }
754
755 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
756 tbl->lq_type);
757 low = high_low & 0xff;
758
759 if (low == IWL_RATE_INVALID)
760 low = scale_index;
761
762 out:
763 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
764 }
765
766 /*
767 * mac80211 sends us Tx status
768 */
769 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
770 struct ieee80211_sta *sta, void *priv_sta,
771 struct sk_buff *skb)
772 {
773 int status;
774 u8 retries;
775 int rs_index, index = 0;
776 struct iwl_lq_sta *lq_sta = priv_sta;
777 struct iwl_link_quality_cmd *table;
778 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
779 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
780 struct ieee80211_hw *hw = priv->hw;
781 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
782 struct iwl_rate_scale_data *window = NULL;
783 struct iwl_rate_scale_data *search_win = NULL;
784 u32 tx_rate;
785 struct iwl_scale_tbl_info tbl_type;
786 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
787 u8 active_index = 0;
788 s32 tpt = 0;
789
790 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
791
792 if (!ieee80211_is_data(hdr->frame_control) ||
793 is_multicast_ether_addr(hdr->addr1))
794 return;
795
796 /* This packet was aggregated but doesn't carry rate scale info */
797 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
798 !(info->flags & IEEE80211_TX_STAT_AMPDU))
799 return;
800
801 retries = info->status.rates[0].count - 1;
802
803 if (retries > 15)
804 retries = 15;
805
806 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
807 !lq_sta->ibss_sta_added)
808 goto out;
809
810 table = &lq_sta->lq;
811 active_index = lq_sta->active_tbl;
812
813 curr_tbl = &(lq_sta->lq_info[active_index]);
814 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
815 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
816 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
817
818 /*
819 * Ignore this Tx frame response if its initial rate doesn't match
820 * that of latest Link Quality command. There may be stragglers
821 * from a previous Link Quality command, but we're no longer interested
822 * in those; they're either from the "active" mode while we're trying
823 * to check "search" mode, or a prior "search" mode after we've moved
824 * to a new "search" mode (which might become the new "active" mode).
825 */
826 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
827 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
828 if (priv->band == IEEE80211_BAND_5GHZ)
829 rs_index -= IWL_FIRST_OFDM_RATE;
830
831 if ((info->status.rates[0].idx < 0) ||
832 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
833 (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
834 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
835 (tbl_type.ant_type != info->antenna_sel_tx) ||
836 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
837 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
838 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
839 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
840 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
841 /* the last LQ command could failed so the LQ in ucode not
842 * the same in driver sync up
843 */
844 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
845 goto out;
846 }
847
848 /* Update frame history window with "failure" for each Tx retry. */
849 while (retries) {
850 /* Look up the rate and other info used for each tx attempt.
851 * Each tx attempt steps one entry deeper in the rate table. */
852 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
853 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
854 &tbl_type, &rs_index);
855
856 /* If type matches "search" table,
857 * add failure to "search" history */
858 if ((tbl_type.lq_type == search_tbl->lq_type) &&
859 (tbl_type.ant_type == search_tbl->ant_type) &&
860 (tbl_type.is_SGI == search_tbl->is_SGI)) {
861 if (search_tbl->expected_tpt)
862 tpt = search_tbl->expected_tpt[rs_index];
863 else
864 tpt = 0;
865 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
866
867 /* Else if type matches "current/active" table,
868 * add failure to "current/active" history */
869 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
870 (tbl_type.ant_type == curr_tbl->ant_type) &&
871 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
872 if (curr_tbl->expected_tpt)
873 tpt = curr_tbl->expected_tpt[rs_index];
874 else
875 tpt = 0;
876 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
877 }
878
879 /* If not searching for a new mode, increment failed counter
880 * ... this helps determine when to start searching again */
881 if (lq_sta->stay_in_tbl)
882 lq_sta->total_failed++;
883 --retries;
884 index++;
885
886 }
887
888 /*
889 * Find (by rate) the history window to update with final Tx attempt;
890 * if Tx was successful first try, use original rate,
891 * else look up the rate that was, finally, successful.
892 */
893 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
894 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
895
896 /* Update frame history window with "success" if Tx got ACKed ... */
897 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
898
899 /* If type matches "search" table,
900 * add final tx status to "search" history */
901 if ((tbl_type.lq_type == search_tbl->lq_type) &&
902 (tbl_type.ant_type == search_tbl->ant_type) &&
903 (tbl_type.is_SGI == search_tbl->is_SGI)) {
904 if (search_tbl->expected_tpt)
905 tpt = search_tbl->expected_tpt[rs_index];
906 else
907 tpt = 0;
908 if (info->flags & IEEE80211_TX_CTL_AMPDU)
909 rs_collect_tx_data(search_win, rs_index, tpt,
910 info->status.ampdu_ack_len,
911 info->status.ampdu_ack_map);
912 else
913 rs_collect_tx_data(search_win, rs_index, tpt,
914 1, status);
915 /* Else if type matches "current/active" table,
916 * add final tx status to "current/active" history */
917 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
918 (tbl_type.ant_type == curr_tbl->ant_type) &&
919 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
920 if (curr_tbl->expected_tpt)
921 tpt = curr_tbl->expected_tpt[rs_index];
922 else
923 tpt = 0;
924 if (info->flags & IEEE80211_TX_CTL_AMPDU)
925 rs_collect_tx_data(window, rs_index, tpt,
926 info->status.ampdu_ack_len,
927 info->status.ampdu_ack_map);
928 else
929 rs_collect_tx_data(window, rs_index, tpt,
930 1, status);
931 }
932
933 /* If not searching for new mode, increment success/failed counter
934 * ... these help determine when to start searching again */
935 if (lq_sta->stay_in_tbl) {
936 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
937 lq_sta->total_success += info->status.ampdu_ack_map;
938 lq_sta->total_failed +=
939 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
940 } else {
941 if (status)
942 lq_sta->total_success++;
943 else
944 lq_sta->total_failed++;
945 }
946 }
947
948 /* See if there's a better rate or modulation mode to try. */
949 if (sta && sta->supp_rates[sband->band])
950 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
951 out:
952 return;
953 }
954
955 /*
956 * Begin a period of staying with a selected modulation mode.
957 * Set "stay_in_tbl" flag to prevent any mode switches.
958 * Set frame tx success limits according to legacy vs. high-throughput,
959 * and reset overall (spanning all rates) tx success history statistics.
960 * These control how long we stay using same modulation mode before
961 * searching for a new mode.
962 */
963 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
964 struct iwl_lq_sta *lq_sta)
965 {
966 IWL_DEBUG_RATE("we are staying in the same table\n");
967 lq_sta->stay_in_tbl = 1; /* only place this gets set */
968 if (is_legacy) {
969 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
970 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
971 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
972 } else {
973 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
974 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
975 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
976 }
977 lq_sta->table_count = 0;
978 lq_sta->total_failed = 0;
979 lq_sta->total_success = 0;
980 }
981
982 /*
983 * Find correct throughput table for given mode of modulation
984 */
985 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
986 struct iwl_scale_tbl_info *tbl)
987 {
988 if (is_legacy(tbl->lq_type)) {
989 if (!is_a_band(tbl->lq_type))
990 tbl->expected_tpt = expected_tpt_G;
991 else
992 tbl->expected_tpt = expected_tpt_A;
993 } else if (is_siso(tbl->lq_type)) {
994 if (tbl->is_fat && !lq_sta->is_dup)
995 if (tbl->is_SGI)
996 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
997 else
998 tbl->expected_tpt = expected_tpt_siso40MHz;
999 else if (tbl->is_SGI)
1000 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1001 else
1002 tbl->expected_tpt = expected_tpt_siso20MHz;
1003
1004 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1005 if (tbl->is_fat && !lq_sta->is_dup)
1006 if (tbl->is_SGI)
1007 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1008 else
1009 tbl->expected_tpt = expected_tpt_mimo40MHz;
1010 else if (tbl->is_SGI)
1011 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1012 else
1013 tbl->expected_tpt = expected_tpt_mimo20MHz;
1014 } else
1015 tbl->expected_tpt = expected_tpt_G;
1016 }
1017
1018 /*
1019 * Find starting rate for new "search" high-throughput mode of modulation.
1020 * Goal is to find lowest expected rate (under perfect conditions) that is
1021 * above the current measured throughput of "active" mode, to give new mode
1022 * a fair chance to prove itself without too many challenges.
1023 *
1024 * This gets called when transitioning to more aggressive modulation
1025 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1026 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1027 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1028 * bit rate will typically need to increase, but not if performance was bad.
1029 */
1030 static s32 rs_get_best_rate(struct iwl_priv *priv,
1031 struct iwl_lq_sta *lq_sta,
1032 struct iwl_scale_tbl_info *tbl, /* "search" */
1033 u16 rate_mask, s8 index)
1034 {
1035 /* "active" values */
1036 struct iwl_scale_tbl_info *active_tbl =
1037 &(lq_sta->lq_info[lq_sta->active_tbl]);
1038 s32 active_sr = active_tbl->win[index].success_ratio;
1039 s32 active_tpt = active_tbl->expected_tpt[index];
1040
1041 /* expected "search" throughput */
1042 s32 *tpt_tbl = tbl->expected_tpt;
1043
1044 s32 new_rate, high, low, start_hi;
1045 u16 high_low;
1046 s8 rate = index;
1047
1048 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1049
1050 for (; ;) {
1051 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1052 tbl->lq_type);
1053
1054 low = high_low & 0xff;
1055 high = (high_low >> 8) & 0xff;
1056
1057 /*
1058 * Lower the "search" bit rate, to give new "search" mode
1059 * approximately the same throughput as "active" if:
1060 *
1061 * 1) "Active" mode has been working modestly well (but not
1062 * great), and expected "search" throughput (under perfect
1063 * conditions) at candidate rate is above the actual
1064 * measured "active" throughput (but less than expected
1065 * "active" throughput under perfect conditions).
1066 * OR
1067 * 2) "Active" mode has been working perfectly or very well
1068 * and expected "search" throughput (under perfect
1069 * conditions) at candidate rate is above expected
1070 * "active" throughput (under perfect conditions).
1071 */
1072 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1073 ((active_sr > IWL_RATE_DECREASE_TH) &&
1074 (active_sr <= IWL_RATE_HIGH_TH) &&
1075 (tpt_tbl[rate] <= active_tpt))) ||
1076 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1077 (tpt_tbl[rate] > active_tpt))) {
1078
1079 /* (2nd or later pass)
1080 * If we've already tried to raise the rate, and are
1081 * now trying to lower it, use the higher rate. */
1082 if (start_hi != IWL_RATE_INVALID) {
1083 new_rate = start_hi;
1084 break;
1085 }
1086
1087 new_rate = rate;
1088
1089 /* Loop again with lower rate */
1090 if (low != IWL_RATE_INVALID)
1091 rate = low;
1092
1093 /* Lower rate not available, use the original */
1094 else
1095 break;
1096
1097 /* Else try to raise the "search" rate to match "active" */
1098 } else {
1099 /* (2nd or later pass)
1100 * If we've already tried to lower the rate, and are
1101 * now trying to raise it, use the lower rate. */
1102 if (new_rate != IWL_RATE_INVALID)
1103 break;
1104
1105 /* Loop again with higher rate */
1106 else if (high != IWL_RATE_INVALID) {
1107 start_hi = high;
1108 rate = high;
1109
1110 /* Higher rate not available, use the original */
1111 } else {
1112 new_rate = rate;
1113 break;
1114 }
1115 }
1116 }
1117
1118 return new_rate;
1119 }
1120
1121 /*
1122 * Set up search table for MIMO
1123 */
1124 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1125 struct iwl_lq_sta *lq_sta,
1126 struct ieee80211_conf *conf,
1127 struct ieee80211_sta *sta,
1128 struct iwl_scale_tbl_info *tbl, int index)
1129 {
1130 u16 rate_mask;
1131 s32 rate;
1132 s8 is_green = lq_sta->is_green;
1133
1134 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1135 return -1;
1136
1137 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1138 == WLAN_HT_CAP_SM_PS_STATIC)
1139 return -1;
1140
1141 /* Need both Tx chains/antennas to support MIMO */
1142 if (priv->hw_params.tx_chains_num < 2)
1143 return -1;
1144
1145 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1146
1147 tbl->lq_type = LQ_MIMO2;
1148 tbl->is_dup = lq_sta->is_dup;
1149 tbl->action = 0;
1150 rate_mask = lq_sta->active_mimo2_rate;
1151
1152 if (priv->current_ht_config.supported_chan_width
1153 == IWL_CHANNEL_WIDTH_40MHZ)
1154 tbl->is_fat = 1;
1155 else
1156 tbl->is_fat = 0;
1157
1158 /* FIXME: - don't toggle SGI here
1159 if (tbl->is_fat) {
1160 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1161 tbl->is_SGI = 1;
1162 else
1163 tbl->is_SGI = 0;
1164 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1165 tbl->is_SGI = 1;
1166 else
1167 tbl->is_SGI = 0;
1168 */
1169
1170 rs_set_expected_tpt_table(lq_sta, tbl);
1171
1172 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1173
1174 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1175
1176 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1177 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1178 rate, rate_mask);
1179 return -1;
1180 }
1181 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1182
1183 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1184 tbl->current_rate, is_green);
1185 return 0;
1186 }
1187
1188 /*
1189 * Set up search table for SISO
1190 */
1191 static int rs_switch_to_siso(struct iwl_priv *priv,
1192 struct iwl_lq_sta *lq_sta,
1193 struct ieee80211_conf *conf,
1194 struct ieee80211_sta *sta,
1195 struct iwl_scale_tbl_info *tbl, int index)
1196 {
1197 u16 rate_mask;
1198 u8 is_green = lq_sta->is_green;
1199 s32 rate;
1200
1201 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1202 return -1;
1203
1204 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1205
1206 tbl->is_dup = lq_sta->is_dup;
1207 tbl->lq_type = LQ_SISO;
1208 tbl->action = 0;
1209 rate_mask = lq_sta->active_siso_rate;
1210
1211 if (priv->current_ht_config.supported_chan_width
1212 == IWL_CHANNEL_WIDTH_40MHZ)
1213 tbl->is_fat = 1;
1214 else
1215 tbl->is_fat = 0;
1216
1217 /* FIXME: - don't toggle SGI here
1218 if (tbl->is_fat) {
1219 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1220 tbl->is_SGI = 1;
1221 else
1222 tbl->is_SGI = 0;
1223 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1224 tbl->is_SGI = 1;
1225 else
1226 tbl->is_SGI = 0;
1227 */
1228
1229 if (is_green)
1230 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1231
1232 rs_set_expected_tpt_table(lq_sta, tbl);
1233 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1234
1235 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1236 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1237 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1238 rate, rate_mask);
1239 return -1;
1240 }
1241 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1242 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1243 tbl->current_rate, is_green);
1244 return 0;
1245 }
1246
1247 /*
1248 * Try to switch to new modulation mode from legacy
1249 */
1250 static int rs_move_legacy_other(struct iwl_priv *priv,
1251 struct iwl_lq_sta *lq_sta,
1252 struct ieee80211_conf *conf,
1253 struct ieee80211_sta *sta,
1254 int index)
1255 {
1256 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1257 struct iwl_scale_tbl_info *search_tbl =
1258 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1259 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1260 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1261 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1262 u8 start_action = tbl->action;
1263 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1264 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1265 int ret = 0;
1266
1267 for (; ;) {
1268 switch (tbl->action) {
1269 case IWL_LEGACY_SWITCH_ANTENNA1:
1270 case IWL_LEGACY_SWITCH_ANTENNA2:
1271 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1272
1273 lq_sta->action_counter++;
1274
1275 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1276 tx_chains_num <= 1) ||
1277 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1278 tx_chains_num <= 2))
1279 break;
1280
1281 /* Don't change antenna if success has been great */
1282 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1283 break;
1284
1285 /* Set up search table to try other antenna */
1286 memcpy(search_tbl, tbl, sz);
1287
1288 if (rs_toggle_antenna(valid_tx_ant,
1289 &search_tbl->current_rate, search_tbl)) {
1290 rs_set_expected_tpt_table(lq_sta, search_tbl);
1291 goto out;
1292 }
1293 break;
1294 case IWL_LEGACY_SWITCH_SISO:
1295 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1296
1297 /* Set up search table to try SISO */
1298 memcpy(search_tbl, tbl, sz);
1299 search_tbl->is_SGI = 0;
1300 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1301 search_tbl, index);
1302 if (!ret) {
1303 lq_sta->action_counter = 0;
1304 goto out;
1305 }
1306
1307 break;
1308 case IWL_LEGACY_SWITCH_MIMO2_AB:
1309 case IWL_LEGACY_SWITCH_MIMO2_AC:
1310 case IWL_LEGACY_SWITCH_MIMO2_BC:
1311 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1312
1313 /* Set up search table to try MIMO */
1314 memcpy(search_tbl, tbl, sz);
1315 search_tbl->is_SGI = 0;
1316
1317 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1318 search_tbl->ant_type = ANT_AB;
1319 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1320 search_tbl->ant_type = ANT_AC;
1321 else
1322 search_tbl->ant_type = ANT_BC;
1323
1324 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1325 break;
1326
1327 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1328 search_tbl, index);
1329 if (!ret) {
1330 lq_sta->action_counter = 0;
1331 goto out;
1332 }
1333 break;
1334 }
1335 tbl->action++;
1336 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1337 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1338
1339 if (tbl->action == start_action)
1340 break;
1341
1342 }
1343 search_tbl->lq_type = LQ_NONE;
1344 return 0;
1345
1346 out:
1347 lq_sta->search_better_tbl = 1;
1348 tbl->action++;
1349 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1350 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1351 return 0;
1352
1353 }
1354
1355 /*
1356 * Try to switch to new modulation mode from SISO
1357 */
1358 static int rs_move_siso_to_other(struct iwl_priv *priv,
1359 struct iwl_lq_sta *lq_sta,
1360 struct ieee80211_conf *conf,
1361 struct ieee80211_sta *sta, int index)
1362 {
1363 u8 is_green = lq_sta->is_green;
1364 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1365 struct iwl_scale_tbl_info *search_tbl =
1366 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1367 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1368 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1369 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1370 u8 start_action = tbl->action;
1371 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1372 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1373 int ret;
1374
1375 for (;;) {
1376 lq_sta->action_counter++;
1377 switch (tbl->action) {
1378 case IWL_SISO_SWITCH_ANTENNA1:
1379 case IWL_SISO_SWITCH_ANTENNA2:
1380 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1381
1382 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1383 tx_chains_num <= 1) ||
1384 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1385 tx_chains_num <= 2))
1386 break;
1387
1388 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1389 break;
1390
1391 memcpy(search_tbl, tbl, sz);
1392 if (rs_toggle_antenna(valid_tx_ant,
1393 &search_tbl->current_rate, search_tbl))
1394 goto out;
1395 break;
1396 case IWL_SISO_SWITCH_MIMO2_AB:
1397 case IWL_SISO_SWITCH_MIMO2_AC:
1398 case IWL_SISO_SWITCH_MIMO2_BC:
1399 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1400 memcpy(search_tbl, tbl, sz);
1401 search_tbl->is_SGI = 0;
1402
1403 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1404 search_tbl->ant_type = ANT_AB;
1405 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1406 search_tbl->ant_type = ANT_AC;
1407 else
1408 search_tbl->ant_type = ANT_BC;
1409
1410 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1411 break;
1412
1413 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1414 search_tbl, index);
1415 if (!ret)
1416 goto out;
1417 break;
1418 case IWL_SISO_SWITCH_GI:
1419 if (!tbl->is_fat &&
1420 !(priv->current_ht_config.sgf &
1421 HT_SHORT_GI_20MHZ))
1422 break;
1423 if (tbl->is_fat &&
1424 !(priv->current_ht_config.sgf &
1425 HT_SHORT_GI_40MHZ))
1426 break;
1427
1428 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1429
1430 memcpy(search_tbl, tbl, sz);
1431 if (is_green) {
1432 if (!tbl->is_SGI)
1433 break;
1434 else
1435 IWL_ERR(priv,
1436 "SGI was set in GF+SISO\n");
1437 }
1438 search_tbl->is_SGI = !tbl->is_SGI;
1439 rs_set_expected_tpt_table(lq_sta, search_tbl);
1440 if (tbl->is_SGI) {
1441 s32 tpt = lq_sta->last_tpt / 100;
1442 if (tpt >= search_tbl->expected_tpt[index])
1443 break;
1444 }
1445 search_tbl->current_rate =
1446 rate_n_flags_from_tbl(priv, search_tbl,
1447 index, is_green);
1448 goto out;
1449 }
1450 tbl->action++;
1451 if (tbl->action > IWL_SISO_SWITCH_GI)
1452 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1453
1454 if (tbl->action == start_action)
1455 break;
1456 }
1457 search_tbl->lq_type = LQ_NONE;
1458 return 0;
1459
1460 out:
1461 lq_sta->search_better_tbl = 1;
1462 tbl->action++;
1463 if (tbl->action > IWL_SISO_SWITCH_GI)
1464 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1465 return 0;
1466 }
1467
1468 /*
1469 * Try to switch to new modulation mode from MIMO
1470 */
1471 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1472 struct iwl_lq_sta *lq_sta,
1473 struct ieee80211_conf *conf,
1474 struct ieee80211_sta *sta, int index)
1475 {
1476 s8 is_green = lq_sta->is_green;
1477 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1478 struct iwl_scale_tbl_info *search_tbl =
1479 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1480 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1481 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1482 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1483 u8 start_action = tbl->action;
1484 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1485 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1486 int ret;
1487
1488 for (;;) {
1489 lq_sta->action_counter++;
1490 switch (tbl->action) {
1491 case IWL_MIMO2_SWITCH_ANTENNA1:
1492 case IWL_MIMO2_SWITCH_ANTENNA2:
1493 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1494
1495 if (tx_chains_num <= 2)
1496 break;
1497
1498 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1499 break;
1500
1501 memcpy(search_tbl, tbl, sz);
1502 if (rs_toggle_antenna(valid_tx_ant,
1503 &search_tbl->current_rate, search_tbl))
1504 goto out;
1505 break;
1506 case IWL_MIMO2_SWITCH_SISO_A:
1507 case IWL_MIMO2_SWITCH_SISO_B:
1508 case IWL_MIMO2_SWITCH_SISO_C:
1509 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1510
1511 /* Set up new search table for SISO */
1512 memcpy(search_tbl, tbl, sz);
1513
1514 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1515 search_tbl->ant_type = ANT_A;
1516 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1517 search_tbl->ant_type = ANT_B;
1518 else
1519 search_tbl->ant_type = ANT_C;
1520
1521 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1522 break;
1523
1524 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1525 search_tbl, index);
1526 if (!ret)
1527 goto out;
1528
1529 break;
1530
1531 case IWL_MIMO2_SWITCH_GI:
1532 if (!tbl->is_fat &&
1533 !(priv->current_ht_config.sgf &
1534 HT_SHORT_GI_20MHZ))
1535 break;
1536 if (tbl->is_fat &&
1537 !(priv->current_ht_config.sgf &
1538 HT_SHORT_GI_40MHZ))
1539 break;
1540
1541 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1542
1543 /* Set up new search table for MIMO */
1544 memcpy(search_tbl, tbl, sz);
1545 search_tbl->is_SGI = !tbl->is_SGI;
1546 rs_set_expected_tpt_table(lq_sta, search_tbl);
1547 /*
1548 * If active table already uses the fastest possible
1549 * modulation (dual stream with short guard interval),
1550 * and it's working well, there's no need to look
1551 * for a better type of modulation!
1552 */
1553 if (tbl->is_SGI) {
1554 s32 tpt = lq_sta->last_tpt / 100;
1555 if (tpt >= search_tbl->expected_tpt[index])
1556 break;
1557 }
1558 search_tbl->current_rate =
1559 rate_n_flags_from_tbl(priv, search_tbl,
1560 index, is_green);
1561 goto out;
1562
1563 }
1564 tbl->action++;
1565 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1566 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1567
1568 if (tbl->action == start_action)
1569 break;
1570 }
1571 search_tbl->lq_type = LQ_NONE;
1572 return 0;
1573 out:
1574 lq_sta->search_better_tbl = 1;
1575 tbl->action++;
1576 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1577 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1578 return 0;
1579
1580 }
1581
1582 /*
1583 * Check whether we should continue using same modulation mode, or
1584 * begin search for a new mode, based on:
1585 * 1) # tx successes or failures while using this mode
1586 * 2) # times calling this function
1587 * 3) elapsed time in this mode (not used, for now)
1588 */
1589 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1590 {
1591 struct iwl_scale_tbl_info *tbl;
1592 int i;
1593 int active_tbl;
1594 int flush_interval_passed = 0;
1595 struct iwl_priv *priv;
1596
1597 priv = lq_sta->drv;
1598 active_tbl = lq_sta->active_tbl;
1599
1600 tbl = &(lq_sta->lq_info[active_tbl]);
1601
1602 /* If we've been disallowing search, see if we should now allow it */
1603 if (lq_sta->stay_in_tbl) {
1604
1605 /* Elapsed time using current modulation mode */
1606 if (lq_sta->flush_timer)
1607 flush_interval_passed =
1608 time_after(jiffies,
1609 (unsigned long)(lq_sta->flush_timer +
1610 IWL_RATE_SCALE_FLUSH_INTVL));
1611
1612 /*
1613 * Check if we should allow search for new modulation mode.
1614 * If many frames have failed or succeeded, or we've used
1615 * this same modulation for a long time, allow search, and
1616 * reset history stats that keep track of whether we should
1617 * allow a new search. Also (below) reset all bitmaps and
1618 * stats in active history.
1619 */
1620 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1621 (lq_sta->total_success > lq_sta->max_success_limit) ||
1622 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1623 && (flush_interval_passed))) {
1624 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1625 lq_sta->total_failed,
1626 lq_sta->total_success,
1627 flush_interval_passed);
1628
1629 /* Allow search for new mode */
1630 lq_sta->stay_in_tbl = 0; /* only place reset */
1631 lq_sta->total_failed = 0;
1632 lq_sta->total_success = 0;
1633 lq_sta->flush_timer = 0;
1634
1635 /*
1636 * Else if we've used this modulation mode enough repetitions
1637 * (regardless of elapsed time or success/failure), reset
1638 * history bitmaps and rate-specific stats for all rates in
1639 * active table.
1640 */
1641 } else {
1642 lq_sta->table_count++;
1643 if (lq_sta->table_count >=
1644 lq_sta->table_count_limit) {
1645 lq_sta->table_count = 0;
1646
1647 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1648 for (i = 0; i < IWL_RATE_COUNT; i++)
1649 rs_rate_scale_clear_window(
1650 &(tbl->win[i]));
1651 }
1652 }
1653
1654 /* If transitioning to allow "search", reset all history
1655 * bitmaps and stats in active table (this will become the new
1656 * "search" table). */
1657 if (!lq_sta->stay_in_tbl) {
1658 for (i = 0; i < IWL_RATE_COUNT; i++)
1659 rs_rate_scale_clear_window(&(tbl->win[i]));
1660 }
1661 }
1662 }
1663
1664 /*
1665 * Do rate scaling and search for new modulation mode.
1666 */
1667 static void rs_rate_scale_perform(struct iwl_priv *priv,
1668 struct ieee80211_hdr *hdr,
1669 struct ieee80211_sta *sta,
1670 struct iwl_lq_sta *lq_sta)
1671 {
1672 struct ieee80211_hw *hw = priv->hw;
1673 struct ieee80211_conf *conf = &hw->conf;
1674 int low = IWL_RATE_INVALID;
1675 int high = IWL_RATE_INVALID;
1676 int index;
1677 int i;
1678 struct iwl_rate_scale_data *window = NULL;
1679 int current_tpt = IWL_INVALID_VALUE;
1680 int low_tpt = IWL_INVALID_VALUE;
1681 int high_tpt = IWL_INVALID_VALUE;
1682 u32 fail_count;
1683 s8 scale_action = 0;
1684 u16 rate_mask;
1685 u8 update_lq = 0;
1686 struct iwl_scale_tbl_info *tbl, *tbl1;
1687 u16 rate_scale_index_msk = 0;
1688 u32 rate;
1689 u8 is_green = 0;
1690 u8 active_tbl = 0;
1691 u8 done_search = 0;
1692 u16 high_low;
1693 s32 sr;
1694 u8 tid = MAX_TID_COUNT;
1695
1696 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1697
1698 /* Send management frames and broadcast/multicast data using
1699 * lowest rate. */
1700 /* TODO: this could probably be improved.. */
1701 if (!ieee80211_is_data(hdr->frame_control) ||
1702 is_multicast_ether_addr(hdr->addr1))
1703 return;
1704
1705 if (!sta || !lq_sta)
1706 return;
1707
1708 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1709
1710 tid = rs_tl_add_packet(lq_sta, hdr);
1711
1712 /*
1713 * Select rate-scale / modulation-mode table to work with in
1714 * the rest of this function: "search" if searching for better
1715 * modulation mode, or "active" if doing rate scaling within a mode.
1716 */
1717 if (!lq_sta->search_better_tbl)
1718 active_tbl = lq_sta->active_tbl;
1719 else
1720 active_tbl = 1 - lq_sta->active_tbl;
1721
1722 tbl = &(lq_sta->lq_info[active_tbl]);
1723 is_green = lq_sta->is_green;
1724
1725 /* current tx rate */
1726 index = lq_sta->last_txrate_idx;
1727
1728 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1729 tbl->lq_type);
1730
1731 /* rates available for this association, and for modulation mode */
1732 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1733
1734 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1735
1736 /* mask with station rate restriction */
1737 if (is_legacy(tbl->lq_type)) {
1738 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1739 /* supp_rates has no CCK bits in A mode */
1740 rate_scale_index_msk = (u16) (rate_mask &
1741 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1742 else
1743 rate_scale_index_msk = (u16) (rate_mask &
1744 lq_sta->supp_rates);
1745
1746 } else
1747 rate_scale_index_msk = rate_mask;
1748
1749 if (!rate_scale_index_msk)
1750 rate_scale_index_msk = rate_mask;
1751
1752 if (!((1 << index) & rate_scale_index_msk)) {
1753 IWL_ERR(priv, "Current Rate is not valid\n");
1754 return;
1755 }
1756
1757 /* Get expected throughput table and history window for current rate */
1758 if (!tbl->expected_tpt) {
1759 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
1760 return;
1761 }
1762
1763 /* force user max rate if set by user */
1764 if ((lq_sta->max_rate_idx != -1) &&
1765 (lq_sta->max_rate_idx < index)) {
1766 index = lq_sta->max_rate_idx;
1767 update_lq = 1;
1768 window = &(tbl->win[index]);
1769 goto lq_update;
1770 }
1771
1772 window = &(tbl->win[index]);
1773
1774 /*
1775 * If there is not enough history to calculate actual average
1776 * throughput, keep analyzing results of more tx frames, without
1777 * changing rate or mode (bypass most of the rest of this function).
1778 * Set up new rate table in uCode only if old rate is not supported
1779 * in current association (use new rate found above).
1780 */
1781 fail_count = window->counter - window->success_counter;
1782 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1783 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1784 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1785 "for index %d\n",
1786 window->success_counter, window->counter, index);
1787
1788 /* Can't calculate this yet; not enough history */
1789 window->average_tpt = IWL_INVALID_VALUE;
1790
1791 /* Should we stay with this modulation mode,
1792 * or search for a new one? */
1793 rs_stay_in_table(lq_sta);
1794
1795 goto out;
1796 }
1797
1798 /* Else we have enough samples; calculate estimate of
1799 * actual average throughput */
1800
1801 BUG_ON(window->average_tpt != ((window->success_ratio *
1802 tbl->expected_tpt[index] + 64) / 128));
1803
1804 /* If we are searching for better modulation mode, check success. */
1805 if (lq_sta->search_better_tbl) {
1806
1807 /* If good success, continue using the "search" mode;
1808 * no need to send new link quality command, since we're
1809 * continuing to use the setup that we've been trying. */
1810 if (window->average_tpt > lq_sta->last_tpt) {
1811
1812 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1813 "suc=%d cur-tpt=%d old-tpt=%d\n",
1814 window->success_ratio,
1815 window->average_tpt,
1816 lq_sta->last_tpt);
1817
1818 if (!is_legacy(tbl->lq_type))
1819 lq_sta->enable_counter = 1;
1820
1821 /* Swap tables; "search" becomes "active" */
1822 lq_sta->active_tbl = active_tbl;
1823 current_tpt = window->average_tpt;
1824
1825 /* Else poor success; go back to mode in "active" table */
1826 } else {
1827
1828 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1829 "suc=%d cur-tpt=%d old-tpt=%d\n",
1830 window->success_ratio,
1831 window->average_tpt,
1832 lq_sta->last_tpt);
1833
1834 /* Nullify "search" table */
1835 tbl->lq_type = LQ_NONE;
1836
1837 /* Revert to "active" table */
1838 active_tbl = lq_sta->active_tbl;
1839 tbl = &(lq_sta->lq_info[active_tbl]);
1840
1841 /* Revert to "active" rate and throughput info */
1842 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1843 current_tpt = lq_sta->last_tpt;
1844
1845 /* Need to set up a new rate table in uCode */
1846 update_lq = 1;
1847 }
1848
1849 /* Either way, we've made a decision; modulation mode
1850 * search is done, allow rate adjustment next time. */
1851 lq_sta->search_better_tbl = 0;
1852 done_search = 1; /* Don't switch modes below! */
1853 goto lq_update;
1854 }
1855
1856 /* (Else) not in search of better modulation mode, try for better
1857 * starting rate, while staying in this mode. */
1858 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1859 tbl->lq_type);
1860 low = high_low & 0xff;
1861 high = (high_low >> 8) & 0xff;
1862
1863 /* If user set max rate, dont allow higher than user constrain */
1864 if ((lq_sta->max_rate_idx != -1) &&
1865 (lq_sta->max_rate_idx < high))
1866 high = IWL_RATE_INVALID;
1867
1868 sr = window->success_ratio;
1869
1870 /* Collect measured throughputs for current and adjacent rates */
1871 current_tpt = window->average_tpt;
1872 if (low != IWL_RATE_INVALID)
1873 low_tpt = tbl->win[low].average_tpt;
1874 if (high != IWL_RATE_INVALID)
1875 high_tpt = tbl->win[high].average_tpt;
1876
1877 scale_action = 0;
1878
1879 /* Too many failures, decrease rate */
1880 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1881 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1882 scale_action = -1;
1883
1884 /* No throughput measured yet for adjacent rates; try increase. */
1885 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1886 (high_tpt == IWL_INVALID_VALUE)) {
1887
1888 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1889 scale_action = 1;
1890 else if (low != IWL_RATE_INVALID)
1891 scale_action = -1;
1892 }
1893
1894 /* Both adjacent throughputs are measured, but neither one has better
1895 * throughput; we're using the best rate, don't change it! */
1896 else if ((low_tpt != IWL_INVALID_VALUE) &&
1897 (high_tpt != IWL_INVALID_VALUE) &&
1898 (low_tpt < current_tpt) &&
1899 (high_tpt < current_tpt))
1900 scale_action = 0;
1901
1902 /* At least one adjacent rate's throughput is measured,
1903 * and may have better performance. */
1904 else {
1905 /* Higher adjacent rate's throughput is measured */
1906 if (high_tpt != IWL_INVALID_VALUE) {
1907 /* Higher rate has better throughput */
1908 if (high_tpt > current_tpt &&
1909 sr >= IWL_RATE_INCREASE_TH) {
1910 scale_action = 1;
1911 } else {
1912 IWL_DEBUG_RATE
1913 ("decrease rate because of high tpt\n");
1914 scale_action = -1;
1915 }
1916
1917 /* Lower adjacent rate's throughput is measured */
1918 } else if (low_tpt != IWL_INVALID_VALUE) {
1919 /* Lower rate has better throughput */
1920 if (low_tpt > current_tpt) {
1921 IWL_DEBUG_RATE
1922 ("decrease rate because of low tpt\n");
1923 scale_action = -1;
1924 } else if (sr >= IWL_RATE_INCREASE_TH) {
1925 scale_action = 1;
1926 }
1927 }
1928 }
1929
1930 /* Sanity check; asked for decrease, but success rate or throughput
1931 * has been good at old rate. Don't change it. */
1932 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1933 ((sr > IWL_RATE_HIGH_TH) ||
1934 (current_tpt > (100 * tbl->expected_tpt[low]))))
1935 scale_action = 0;
1936
1937 switch (scale_action) {
1938 case -1:
1939 /* Decrease starting rate, update uCode's rate table */
1940 if (low != IWL_RATE_INVALID) {
1941 update_lq = 1;
1942 index = low;
1943 }
1944 break;
1945 case 1:
1946 /* Increase starting rate, update uCode's rate table */
1947 if (high != IWL_RATE_INVALID) {
1948 update_lq = 1;
1949 index = high;
1950 }
1951
1952 break;
1953 case 0:
1954 /* No change */
1955 default:
1956 break;
1957 }
1958
1959 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1960 "high %d type %d\n",
1961 index, scale_action, low, high, tbl->lq_type);
1962
1963 lq_update:
1964 /* Replace uCode's rate table for the destination station. */
1965 if (update_lq) {
1966 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1967 rs_fill_link_cmd(priv, lq_sta, rate);
1968 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1969 }
1970
1971 /* Should we stay with this modulation mode, or search for a new one? */
1972 rs_stay_in_table(lq_sta);
1973
1974 /*
1975 * Search for new modulation mode if we're:
1976 * 1) Not changing rates right now
1977 * 2) Not just finishing up a search
1978 * 3) Allowing a new search
1979 */
1980 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1981 /* Save current throughput to compare with "search" throughput*/
1982 lq_sta->last_tpt = current_tpt;
1983
1984 /* Select a new "search" modulation mode to try.
1985 * If one is found, set up the new "search" table. */
1986 if (is_legacy(tbl->lq_type))
1987 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1988 else if (is_siso(tbl->lq_type))
1989 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1990 else
1991 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1992
1993 /* If new "search" mode was selected, set up in uCode table */
1994 if (lq_sta->search_better_tbl) {
1995 /* Access the "search" table, clear its history. */
1996 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1997 for (i = 0; i < IWL_RATE_COUNT; i++)
1998 rs_rate_scale_clear_window(&(tbl->win[i]));
1999
2000 /* Use new "search" start rate */
2001 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2002
2003 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
2004 tbl->current_rate, index);
2005 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2006 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2007 }
2008
2009 /* If the "active" (non-search) mode was legacy,
2010 * and we've tried switching antennas,
2011 * but we haven't been able to try HT modes (not available),
2012 * stay with best antenna legacy modulation for a while
2013 * before next round of mode comparisons. */
2014 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2015 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2016 lq_sta->action_counter >= 1) {
2017 lq_sta->action_counter = 0;
2018 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2019 rs_set_stay_in_table(priv, 1, lq_sta);
2020 }
2021
2022 /* If we're in an HT mode, and all 3 mode switch actions
2023 * have been tried and compared, stay in this best modulation
2024 * mode for a while before next round of mode comparisons. */
2025 if (lq_sta->enable_counter &&
2026 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2027 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2028 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2029 (tid != MAX_TID_COUNT)) {
2030 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2031 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2032 }
2033 lq_sta->action_counter = 0;
2034 rs_set_stay_in_table(priv, 0, lq_sta);
2035 }
2036
2037 /*
2038 * Else, don't search for a new modulation mode.
2039 * Put new timestamp in stay-in-modulation-mode flush timer if:
2040 * 1) Not changing rates right now
2041 * 2) Not just finishing up a search
2042 * 3) flush timer is empty
2043 */
2044 } else {
2045 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2046 lq_sta->flush_timer = jiffies;
2047 }
2048
2049 out:
2050 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2051 i = index;
2052 lq_sta->last_txrate_idx = i;
2053
2054 return;
2055 }
2056
2057
2058 static void rs_initialize_lq(struct iwl_priv *priv,
2059 struct ieee80211_conf *conf,
2060 struct ieee80211_sta *sta,
2061 struct iwl_lq_sta *lq_sta)
2062 {
2063 struct iwl_scale_tbl_info *tbl;
2064 int rate_idx;
2065 int i;
2066 u32 rate;
2067 u8 use_green = rs_use_green(priv, conf);
2068 u8 active_tbl = 0;
2069 u8 valid_tx_ant;
2070
2071 if (!sta || !lq_sta)
2072 goto out;
2073
2074 i = lq_sta->last_txrate_idx;
2075
2076 if ((lq_sta->lq.sta_id == 0xff) &&
2077 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2078 goto out;
2079
2080 valid_tx_ant = priv->hw_params.valid_tx_ant;
2081
2082 if (!lq_sta->search_better_tbl)
2083 active_tbl = lq_sta->active_tbl;
2084 else
2085 active_tbl = 1 - lq_sta->active_tbl;
2086
2087 tbl = &(lq_sta->lq_info[active_tbl]);
2088
2089 if ((i < 0) || (i >= IWL_RATE_COUNT))
2090 i = 0;
2091
2092 rate = iwl_rates[i].plcp;
2093 tbl->ant_type = first_antenna(valid_tx_ant);
2094 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2095
2096 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2097 rate |= RATE_MCS_CCK_MSK;
2098
2099 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2100 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2101 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2102
2103 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2104 tbl->current_rate = rate;
2105 rs_set_expected_tpt_table(lq_sta, tbl);
2106 rs_fill_link_cmd(NULL, lq_sta, rate);
2107 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2108 out:
2109 return;
2110 }
2111
2112 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2113 struct ieee80211_tx_rate_control *txrc)
2114 {
2115
2116 struct sk_buff *skb = txrc->skb;
2117 struct ieee80211_supported_band *sband = txrc->sband;
2118 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2119 struct ieee80211_conf *conf = &priv->hw->conf;
2120 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2121 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2122 struct iwl_lq_sta *lq_sta = priv_sta;
2123 int rate_idx;
2124 u64 mask_bit = 0;
2125
2126 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2127
2128 /* Get max rate if user set max rate */
2129 if (lq_sta) {
2130 lq_sta->max_rate_idx = txrc->max_rate_idx;
2131 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2132 (lq_sta->max_rate_idx != -1))
2133 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2134 if ((lq_sta->max_rate_idx < 0) ||
2135 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2136 lq_sta->max_rate_idx = -1;
2137 }
2138
2139 if (sta)
2140 mask_bit = sta->supp_rates[sband->band];
2141
2142 /* Send management frames and broadcast/multicast data using lowest
2143 * rate. */
2144 if (!ieee80211_is_data(hdr->frame_control) ||
2145 is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) {
2146 if (!mask_bit)
2147 info->control.rates[0].idx =
2148 rate_lowest_index(sband, NULL);
2149 else
2150 info->control.rates[0].idx =
2151 rate_lowest_index(sband, sta);
2152 return;
2153 }
2154
2155 rate_idx = lq_sta->last_txrate_idx;
2156
2157 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2158 !lq_sta->ibss_sta_added) {
2159 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2160
2161 if (sta_id == IWL_INVALID_STATION) {
2162 IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2163 hdr->addr1);
2164 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2165 0, CMD_ASYNC, NULL);
2166 }
2167 if ((sta_id != IWL_INVALID_STATION)) {
2168 lq_sta->lq.sta_id = sta_id;
2169 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2170 lq_sta->ibss_sta_added = 1;
2171 rs_initialize_lq(priv, conf, sta, lq_sta);
2172 }
2173 }
2174
2175 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT)
2176 rate_idx = rate_lowest_index(sband, sta);
2177 else if (sband->band == IEEE80211_BAND_5GHZ)
2178 rate_idx -= IWL_FIRST_OFDM_RATE;
2179
2180 info->control.rates[0].idx = rate_idx;
2181 }
2182
2183 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2184 gfp_t gfp)
2185 {
2186 struct iwl_lq_sta *lq_sta;
2187 struct iwl_priv *priv;
2188 int i, j;
2189
2190 priv = (struct iwl_priv *)priv_rate;
2191 IWL_DEBUG_RATE("create station rate scale window\n");
2192
2193 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2194
2195 if (lq_sta == NULL)
2196 return NULL;
2197 lq_sta->lq.sta_id = 0xff;
2198
2199
2200 for (j = 0; j < LQ_SIZE; j++)
2201 for (i = 0; i < IWL_RATE_COUNT; i++)
2202 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2203
2204 return lq_sta;
2205 }
2206
2207 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2208 struct ieee80211_sta *sta, void *priv_sta)
2209 {
2210 int i, j;
2211 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2212 struct ieee80211_conf *conf = &priv->hw->conf;
2213 struct iwl_lq_sta *lq_sta = priv_sta;
2214 u16 mask_bit = 0;
2215
2216 lq_sta->flush_timer = 0;
2217 lq_sta->supp_rates = sta->supp_rates[sband->band];
2218 for (j = 0; j < LQ_SIZE; j++)
2219 for (i = 0; i < IWL_RATE_COUNT; i++)
2220 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2221
2222 IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2223 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2224 * the lowest or the highest rate.. Could consider using RSSI from
2225 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2226 * after assoc.. */
2227
2228 lq_sta->ibss_sta_added = 0;
2229 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2230 u8 sta_id = iwl_find_station(priv, sta->addr);
2231
2232 /* for IBSS the call are from tasklet */
2233 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2234
2235 if (sta_id == IWL_INVALID_STATION) {
2236 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2237 sta_id = iwl_add_station_flags(priv, sta->addr,
2238 0, CMD_ASYNC, NULL);
2239 }
2240 if ((sta_id != IWL_INVALID_STATION)) {
2241 lq_sta->lq.sta_id = sta_id;
2242 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2243 }
2244 /* FIXME: this is w/a remove it later */
2245 priv->assoc_station_added = 1;
2246 }
2247
2248 lq_sta->is_dup = 0;
2249 lq_sta->max_rate_idx = -1;
2250 lq_sta->is_green = rs_use_green(priv, conf);
2251 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2252 lq_sta->active_rate_basic = priv->active_rate_basic;
2253 lq_sta->band = priv->band;
2254 /*
2255 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2256 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2257 */
2258 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2259 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2260 lq_sta->active_siso_rate &= ~((u16)0x2);
2261 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2262
2263 /* Same here */
2264 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2265 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2266 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2267 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2268
2269 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2270 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2271 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2272 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2273
2274 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2275 lq_sta->active_siso_rate,
2276 lq_sta->active_mimo2_rate,
2277 lq_sta->active_mimo3_rate);
2278
2279 /* These values will be overridden later */
2280 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2281 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2282
2283 /* as default allow aggregation for all tids */
2284 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2285 lq_sta->drv = priv;
2286
2287 /* Find highest tx rate supported by hardware and destination station */
2288 mask_bit = sta->supp_rates[sband->band] & lq_sta->active_legacy_rate;
2289 lq_sta->last_txrate_idx = 3;
2290 for (i = 0; i < sband->n_bitrates; i++)
2291 if (mask_bit & BIT(i))
2292 lq_sta->last_txrate_idx = i;
2293
2294 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2295 if (sband->band == IEEE80211_BAND_5GHZ)
2296 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2297
2298 rs_initialize_lq(priv, conf, sta, lq_sta);
2299 }
2300
2301 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2302 struct iwl_lq_sta *lq_sta, u32 new_rate)
2303 {
2304 struct iwl_scale_tbl_info tbl_type;
2305 int index = 0;
2306 int rate_idx;
2307 int repeat_rate = 0;
2308 u8 ant_toggle_cnt = 0;
2309 u8 use_ht_possible = 1;
2310 u8 valid_tx_ant = 0;
2311 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2312
2313 /* Override starting rate (index 0) if needed for debug purposes */
2314 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2315
2316 /* Interpret new_rate (rate_n_flags) */
2317 memset(&tbl_type, 0, sizeof(tbl_type));
2318 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2319 &tbl_type, &rate_idx);
2320
2321 /* How many times should we repeat the initial rate? */
2322 if (is_legacy(tbl_type.lq_type)) {
2323 ant_toggle_cnt = 1;
2324 repeat_rate = IWL_NUMBER_TRY;
2325 } else {
2326 repeat_rate = IWL_HT_NUMBER_TRY;
2327 }
2328
2329 lq_cmd->general_params.mimo_delimiter =
2330 is_mimo(tbl_type.lq_type) ? 1 : 0;
2331
2332 /* Fill 1st table entry (index 0) */
2333 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2334
2335 if (num_of_ant(tbl_type.ant_type) == 1) {
2336 lq_cmd->general_params.single_stream_ant_msk =
2337 tbl_type.ant_type;
2338 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2339 lq_cmd->general_params.dual_stream_ant_msk =
2340 tbl_type.ant_type;
2341 } /* otherwise we don't modify the existing value */
2342
2343 index++;
2344 repeat_rate--;
2345
2346 if (priv)
2347 valid_tx_ant = priv->hw_params.valid_tx_ant;
2348
2349 /* Fill rest of rate table */
2350 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2351 /* Repeat initial/next rate.
2352 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2353 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2354 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2355 if (is_legacy(tbl_type.lq_type)) {
2356 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2357 ant_toggle_cnt++;
2358 else if (priv &&
2359 rs_toggle_antenna(valid_tx_ant,
2360 &new_rate, &tbl_type))
2361 ant_toggle_cnt = 1;
2362 }
2363
2364 /* Override next rate if needed for debug purposes */
2365 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2366
2367 /* Fill next table entry */
2368 lq_cmd->rs_table[index].rate_n_flags =
2369 cpu_to_le32(new_rate);
2370 repeat_rate--;
2371 index++;
2372 }
2373
2374 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2375 &rate_idx);
2376
2377 /* Indicate to uCode which entries might be MIMO.
2378 * If initial rate was MIMO, this will finally end up
2379 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2380 if (is_mimo(tbl_type.lq_type))
2381 lq_cmd->general_params.mimo_delimiter = index;
2382
2383 /* Get next rate */
2384 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2385 use_ht_possible);
2386
2387 /* How many times should we repeat the next rate? */
2388 if (is_legacy(tbl_type.lq_type)) {
2389 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2390 ant_toggle_cnt++;
2391 else if (priv &&
2392 rs_toggle_antenna(valid_tx_ant,
2393 &new_rate, &tbl_type))
2394 ant_toggle_cnt = 1;
2395
2396 repeat_rate = IWL_NUMBER_TRY;
2397 } else {
2398 repeat_rate = IWL_HT_NUMBER_TRY;
2399 }
2400
2401 /* Don't allow HT rates after next pass.
2402 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2403 use_ht_possible = 0;
2404
2405 /* Override next rate if needed for debug purposes */
2406 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2407
2408 /* Fill next table entry */
2409 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2410
2411 index++;
2412 repeat_rate--;
2413 }
2414
2415 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2416 lq_cmd->agg_params.agg_dis_start_th = 3;
2417 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2418 }
2419
2420 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2421 {
2422 return hw->priv;
2423 }
2424 /* rate scale requires free function to be implemented */
2425 static void rs_free(void *priv_rate)
2426 {
2427 return;
2428 }
2429
2430 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2431 void *priv_sta)
2432 {
2433 struct iwl_lq_sta *lq_sta = priv_sta;
2434 struct iwl_priv *priv __maybe_unused = priv_r;
2435
2436 IWL_DEBUG_RATE("enter\n");
2437 kfree(lq_sta);
2438 IWL_DEBUG_RATE("leave\n");
2439 }
2440
2441
2442 #ifdef CONFIG_MAC80211_DEBUGFS
2443 static int open_file_generic(struct inode *inode, struct file *file)
2444 {
2445 file->private_data = inode->i_private;
2446 return 0;
2447 }
2448 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2449 u32 *rate_n_flags, int index)
2450 {
2451 struct iwl_priv *priv;
2452
2453 priv = lq_sta->drv;
2454 if (lq_sta->dbg_fixed_rate) {
2455 if (index < 12) {
2456 *rate_n_flags = lq_sta->dbg_fixed_rate;
2457 } else {
2458 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2459 *rate_n_flags = 0x800D;
2460 else
2461 *rate_n_flags = 0x820A;
2462 }
2463 IWL_DEBUG_RATE("Fixed rate ON\n");
2464 } else {
2465 IWL_DEBUG_RATE("Fixed rate OFF\n");
2466 }
2467 }
2468
2469 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2470 const char __user *user_buf, size_t count, loff_t *ppos)
2471 {
2472 struct iwl_lq_sta *lq_sta = file->private_data;
2473 struct iwl_priv *priv;
2474 char buf[64];
2475 int buf_size;
2476 u32 parsed_rate;
2477
2478 priv = lq_sta->drv;
2479 memset(buf, 0, sizeof(buf));
2480 buf_size = min(count, sizeof(buf) - 1);
2481 if (copy_from_user(buf, user_buf, buf_size))
2482 return -EFAULT;
2483
2484 if (sscanf(buf, "%x", &parsed_rate) == 1)
2485 lq_sta->dbg_fixed_rate = parsed_rate;
2486 else
2487 lq_sta->dbg_fixed_rate = 0;
2488
2489 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2490 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2491 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2492 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2493
2494 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2495 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2496
2497 if (lq_sta->dbg_fixed_rate) {
2498 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2499 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2500 }
2501
2502 return count;
2503 }
2504
2505 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2506 char __user *user_buf, size_t count, loff_t *ppos)
2507 {
2508 char buff[1024];
2509 int desc = 0;
2510 int i = 0;
2511
2512 struct iwl_lq_sta *lq_sta = file->private_data;
2513
2514 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2515 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2516 lq_sta->total_failed, lq_sta->total_success,
2517 lq_sta->active_legacy_rate);
2518 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2519 lq_sta->dbg_fixed_rate);
2520 desc += sprintf(buff+desc, "general:"
2521 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2522 lq_sta->lq.general_params.flags,
2523 lq_sta->lq.general_params.mimo_delimiter,
2524 lq_sta->lq.general_params.single_stream_ant_msk,
2525 lq_sta->lq.general_params.dual_stream_ant_msk);
2526
2527 desc += sprintf(buff+desc, "agg:"
2528 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2529 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2530 lq_sta->lq.agg_params.agg_dis_start_th,
2531 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2532
2533 desc += sprintf(buff+desc,
2534 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2535 lq_sta->lq.general_params.start_rate_index[0],
2536 lq_sta->lq.general_params.start_rate_index[1],
2537 lq_sta->lq.general_params.start_rate_index[2],
2538 lq_sta->lq.general_params.start_rate_index[3]);
2539
2540
2541 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2542 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2543 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2544
2545 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2546 }
2547
2548 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2549 .write = rs_sta_dbgfs_scale_table_write,
2550 .read = rs_sta_dbgfs_scale_table_read,
2551 .open = open_file_generic,
2552 };
2553 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2554 char __user *user_buf, size_t count, loff_t *ppos)
2555 {
2556 char buff[1024];
2557 int desc = 0;
2558 int i, j;
2559
2560 struct iwl_lq_sta *lq_sta = file->private_data;
2561 for (i = 0; i < LQ_SIZE; i++) {
2562 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2563 "rate=0x%X\n",
2564 lq_sta->active_tbl == i ? "*" : "x",
2565 lq_sta->lq_info[i].lq_type,
2566 lq_sta->lq_info[i].is_SGI,
2567 lq_sta->lq_info[i].is_fat,
2568 lq_sta->lq_info[i].is_dup,
2569 lq_sta->lq_info[i].current_rate);
2570 for (j = 0; j < IWL_RATE_COUNT; j++) {
2571 desc += sprintf(buff+desc,
2572 "counter=%d success=%d %%=%d\n",
2573 lq_sta->lq_info[i].win[j].counter,
2574 lq_sta->lq_info[i].win[j].success_counter,
2575 lq_sta->lq_info[i].win[j].success_ratio);
2576 }
2577 }
2578 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2579 }
2580
2581 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2582 .read = rs_sta_dbgfs_stats_table_read,
2583 .open = open_file_generic,
2584 };
2585
2586 static void rs_add_debugfs(void *priv, void *priv_sta,
2587 struct dentry *dir)
2588 {
2589 struct iwl_lq_sta *lq_sta = priv_sta;
2590 lq_sta->rs_sta_dbgfs_scale_table_file =
2591 debugfs_create_file("rate_scale_table", 0600, dir,
2592 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2593 lq_sta->rs_sta_dbgfs_stats_table_file =
2594 debugfs_create_file("rate_stats_table", 0600, dir,
2595 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2596 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2597 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2598 &lq_sta->tx_agg_tid_en);
2599
2600 }
2601
2602 static void rs_remove_debugfs(void *priv, void *priv_sta)
2603 {
2604 struct iwl_lq_sta *lq_sta = priv_sta;
2605 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2606 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2607 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2608 }
2609 #endif
2610
2611 static struct rate_control_ops rs_ops = {
2612 .module = NULL,
2613 .name = RS_NAME,
2614 .tx_status = rs_tx_status,
2615 .get_rate = rs_get_rate,
2616 .rate_init = rs_rate_init,
2617 .alloc = rs_alloc,
2618 .free = rs_free,
2619 .alloc_sta = rs_alloc_sta,
2620 .free_sta = rs_free_sta,
2621 #ifdef CONFIG_MAC80211_DEBUGFS
2622 .add_sta_debugfs = rs_add_debugfs,
2623 .remove_sta_debugfs = rs_remove_debugfs,
2624 #endif
2625 };
2626
2627 int iwlagn_rate_control_register(void)
2628 {
2629 return ieee80211_rate_control_register(&rs_ops);
2630 }
2631
2632 void iwlagn_rate_control_unregister(void)
2633 {
2634 ieee80211_rate_control_unregister(&rs_ops);
2635 }
2636
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree